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1/*
2 * xHCI host controller driver
3 *
4 * Copyright (C) 2008 Intel Corp.
5 *
6 * Author: Sarah Sharp
7 * Some code borrowed from the Linux EHCI driver.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 * for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software Foundation,
20 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22
23#include <linux/pci.h>
24#include <linux/irq.h>
25#include <linux/log2.h>
26#include <linux/module.h>
27#include <linux/moduleparam.h>
28#include <linux/slab.h>
29
30#include "xhci.h"
31
32#define DRIVER_AUTHOR "Sarah Sharp"
33#define DRIVER_DESC "'eXtensible' Host Controller (xHC) Driver"
34
35/* Some 0.95 hardware can't handle the chain bit on a Link TRB being cleared */
36static int link_quirk;
37module_param(link_quirk, int, S_IRUGO | S_IWUSR);
38MODULE_PARM_DESC(link_quirk, "Don't clear the chain bit on a link TRB");
39
40/* TODO: copied from ehci-hcd.c - can this be refactored? */
41/*
42 * handshake - spin reading hc until handshake completes or fails
43 * @ptr: address of hc register to be read
44 * @mask: bits to look at in result of read
45 * @done: value of those bits when handshake succeeds
46 * @usec: timeout in microseconds
47 *
48 * Returns negative errno, or zero on success
49 *
50 * Success happens when the "mask" bits have the specified value (hardware
51 * handshake done). There are two failure modes: "usec" have passed (major
52 * hardware flakeout), or the register reads as all-ones (hardware removed).
53 */
54static int handshake(struct xhci_hcd *xhci, void __iomem *ptr,
55 u32 mask, u32 done, int usec)
56{
57 u32 result;
58
59 do {
60 result = xhci_readl(xhci, ptr);
61 if (result == ~(u32)0) /* card removed */
62 return -ENODEV;
63 result &= mask;
64 if (result == done)
65 return 0;
66 udelay(1);
67 usec--;
68 } while (usec > 0);
69 return -ETIMEDOUT;
70}
71
72/*
73 * Disable interrupts and begin the xHCI halting process.
74 */
75void xhci_quiesce(struct xhci_hcd *xhci)
76{
77 u32 halted;
78 u32 cmd;
79 u32 mask;
80
81 mask = ~(XHCI_IRQS);
82 halted = xhci_readl(xhci, &xhci->op_regs->status) & STS_HALT;
83 if (!halted)
84 mask &= ~CMD_RUN;
85
86 cmd = xhci_readl(xhci, &xhci->op_regs->command);
87 cmd &= mask;
88 xhci_writel(xhci, cmd, &xhci->op_regs->command);
89}
90
91/*
92 * Force HC into halt state.
93 *
94 * Disable any IRQs and clear the run/stop bit.
95 * HC will complete any current and actively pipelined transactions, and
96 * should halt within 16 ms of the run/stop bit being cleared.
97 * Read HC Halted bit in the status register to see when the HC is finished.
98 */
99int xhci_halt(struct xhci_hcd *xhci)
100{
101 int ret;
102 xhci_dbg(xhci, "// Halt the HC\n");
103 xhci_quiesce(xhci);
104
105 ret = handshake(xhci, &xhci->op_regs->status,
106 STS_HALT, STS_HALT, XHCI_MAX_HALT_USEC);
107 if (!ret)
108 xhci->xhc_state |= XHCI_STATE_HALTED;
109 return ret;
110}
111
112/*
113 * Set the run bit and wait for the host to be running.
114 */
115static int xhci_start(struct xhci_hcd *xhci)
116{
117 u32 temp;
118 int ret;
119
120 temp = xhci_readl(xhci, &xhci->op_regs->command);
121 temp |= (CMD_RUN);
122 xhci_dbg(xhci, "// Turn on HC, cmd = 0x%x.\n",
123 temp);
124 xhci_writel(xhci, temp, &xhci->op_regs->command);
125
126 /*
127 * Wait for the HCHalted Status bit to be 0 to indicate the host is
128 * running.
129 */
130 ret = handshake(xhci, &xhci->op_regs->status,
131 STS_HALT, 0, XHCI_MAX_HALT_USEC);
132 if (ret == -ETIMEDOUT)
133 xhci_err(xhci, "Host took too long to start, "
134 "waited %u microseconds.\n",
135 XHCI_MAX_HALT_USEC);
136 if (!ret)
137 xhci->xhc_state &= ~XHCI_STATE_HALTED;
138 return ret;
139}
140
141/*
142 * Reset a halted HC.
143 *
144 * This resets pipelines, timers, counters, state machines, etc.
145 * Transactions will be terminated immediately, and operational registers
146 * will be set to their defaults.
147 */
148int xhci_reset(struct xhci_hcd *xhci)
149{
150 u32 command;
151 u32 state;
152 int ret;
153
154 state = xhci_readl(xhci, &xhci->op_regs->status);
155 if ((state & STS_HALT) == 0) {
156 xhci_warn(xhci, "Host controller not halted, aborting reset.\n");
157 return 0;
158 }
159
160 xhci_dbg(xhci, "// Reset the HC\n");
161 command = xhci_readl(xhci, &xhci->op_regs->command);
162 command |= CMD_RESET;
163 xhci_writel(xhci, command, &xhci->op_regs->command);
164
165 ret = handshake(xhci, &xhci->op_regs->command,
166 CMD_RESET, 0, 250 * 1000);
167 if (ret)
168 return ret;
169
170 xhci_dbg(xhci, "Wait for controller to be ready for doorbell rings\n");
171 /*
172 * xHCI cannot write to any doorbells or operational registers other
173 * than status until the "Controller Not Ready" flag is cleared.
174 */
175 return handshake(xhci, &xhci->op_regs->status, STS_CNR, 0, 250 * 1000);
176}
177
178/*
179 * Free IRQs
180 * free all IRQs request
181 */
182static void xhci_free_irq(struct xhci_hcd *xhci)
183{
184 int i;
185 struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
186
187 /* return if using legacy interrupt */
188 if (xhci_to_hcd(xhci)->irq >= 0)
189 return;
190
191 if (xhci->msix_entries) {
192 for (i = 0; i < xhci->msix_count; i++)
193 if (xhci->msix_entries[i].vector)
194 free_irq(xhci->msix_entries[i].vector,
195 xhci_to_hcd(xhci));
196 } else if (pdev->irq >= 0)
197 free_irq(pdev->irq, xhci_to_hcd(xhci));
198
199 return;
200}
201
202/*
203 * Set up MSI
204 */
205static int xhci_setup_msi(struct xhci_hcd *xhci)
206{
207 int ret;
208 struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
209
210 ret = pci_enable_msi(pdev);
211 if (ret) {
212 xhci_err(xhci, "failed to allocate MSI entry\n");
213 return ret;
214 }
215
216 ret = request_irq(pdev->irq, (irq_handler_t)xhci_msi_irq,
217 0, "xhci_hcd", xhci_to_hcd(xhci));
218 if (ret) {
219 xhci_err(xhci, "disable MSI interrupt\n");
220 pci_disable_msi(pdev);
221 }
222
223 return ret;
224}
225
226/*
227 * Set up MSI-X
228 */
229static int xhci_setup_msix(struct xhci_hcd *xhci)
230{
231 int i, ret = 0;
232 struct usb_hcd *hcd = xhci_to_hcd(xhci);
233 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
234
235 /*
236 * calculate number of msi-x vectors supported.
237 * - HCS_MAX_INTRS: the max number of interrupts the host can handle,
238 * with max number of interrupters based on the xhci HCSPARAMS1.
239 * - num_online_cpus: maximum msi-x vectors per CPUs core.
240 * Add additional 1 vector to ensure always available interrupt.
241 */
242 xhci->msix_count = min(num_online_cpus() + 1,
243 HCS_MAX_INTRS(xhci->hcs_params1));
244
245 xhci->msix_entries =
246 kmalloc((sizeof(struct msix_entry))*xhci->msix_count,
247 GFP_KERNEL);
248 if (!xhci->msix_entries) {
249 xhci_err(xhci, "Failed to allocate MSI-X entries\n");
250 return -ENOMEM;
251 }
252
253 for (i = 0; i < xhci->msix_count; i++) {
254 xhci->msix_entries[i].entry = i;
255 xhci->msix_entries[i].vector = 0;
256 }
257
258 ret = pci_enable_msix(pdev, xhci->msix_entries, xhci->msix_count);
259 if (ret) {
260 xhci_err(xhci, "Failed to enable MSI-X\n");
261 goto free_entries;
262 }
263
264 for (i = 0; i < xhci->msix_count; i++) {
265 ret = request_irq(xhci->msix_entries[i].vector,
266 (irq_handler_t)xhci_msi_irq,
267 0, "xhci_hcd", xhci_to_hcd(xhci));
268 if (ret)
269 goto disable_msix;
270 }
271
272 hcd->msix_enabled = 1;
273 return ret;
274
275disable_msix:
276 xhci_err(xhci, "disable MSI-X interrupt\n");
277 xhci_free_irq(xhci);
278 pci_disable_msix(pdev);
279free_entries:
280 kfree(xhci->msix_entries);
281 xhci->msix_entries = NULL;
282 return ret;
283}
284
285/* Free any IRQs and disable MSI-X */
286static void xhci_cleanup_msix(struct xhci_hcd *xhci)
287{
288 struct usb_hcd *hcd = xhci_to_hcd(xhci);
289 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
290
291 xhci_free_irq(xhci);
292
293 if (xhci->msix_entries) {
294 pci_disable_msix(pdev);
295 kfree(xhci->msix_entries);
296 xhci->msix_entries = NULL;
297 } else {
298 pci_disable_msi(pdev);
299 }
300
301 hcd->msix_enabled = 0;
302 return;
303}
304
305/*
306 * Initialize memory for HCD and xHC (one-time init).
307 *
308 * Program the PAGESIZE register, initialize the device context array, create
309 * device contexts (?), set up a command ring segment (or two?), create event
310 * ring (one for now).
311 */
312int xhci_init(struct usb_hcd *hcd)
313{
314 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
315 int retval = 0;
316
317 xhci_dbg(xhci, "xhci_init\n");
318 spin_lock_init(&xhci->lock);
319 if (link_quirk) {
320 xhci_dbg(xhci, "QUIRK: Not clearing Link TRB chain bits.\n");
321 xhci->quirks |= XHCI_LINK_TRB_QUIRK;
322 } else {
323 xhci_dbg(xhci, "xHCI doesn't need link TRB QUIRK\n");
324 }
325 retval = xhci_mem_init(xhci, GFP_KERNEL);
326 xhci_dbg(xhci, "Finished xhci_init\n");
327
328 return retval;
329}
330
331/*-------------------------------------------------------------------------*/
332
333
334#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
335static void xhci_event_ring_work(unsigned long arg)
336{
337 unsigned long flags;
338 int temp;
339 u64 temp_64;
340 struct xhci_hcd *xhci = (struct xhci_hcd *) arg;
341 int i, j;
342
343 xhci_dbg(xhci, "Poll event ring: %lu\n", jiffies);
344
345 spin_lock_irqsave(&xhci->lock, flags);
346 temp = xhci_readl(xhci, &xhci->op_regs->status);
347 xhci_dbg(xhci, "op reg status = 0x%x\n", temp);
348 if (temp == 0xffffffff || (xhci->xhc_state & XHCI_STATE_DYING) ||
349 (xhci->xhc_state & XHCI_STATE_HALTED)) {
350 xhci_dbg(xhci, "HW died, polling stopped.\n");
351 spin_unlock_irqrestore(&xhci->lock, flags);
352 return;
353 }
354
355 temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
356 xhci_dbg(xhci, "ir_set 0 pending = 0x%x\n", temp);
357 xhci_dbg(xhci, "HC error bitmask = 0x%x\n", xhci->error_bitmask);
358 xhci->error_bitmask = 0;
359 xhci_dbg(xhci, "Event ring:\n");
360 xhci_debug_segment(xhci, xhci->event_ring->deq_seg);
361 xhci_dbg_ring_ptrs(xhci, xhci->event_ring);
362 temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
363 temp_64 &= ~ERST_PTR_MASK;
364 xhci_dbg(xhci, "ERST deq = 64'h%0lx\n", (long unsigned int) temp_64);
365 xhci_dbg(xhci, "Command ring:\n");
366 xhci_debug_segment(xhci, xhci->cmd_ring->deq_seg);
367 xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring);
368 xhci_dbg_cmd_ptrs(xhci);
369 for (i = 0; i < MAX_HC_SLOTS; ++i) {
370 if (!xhci->devs[i])
371 continue;
372 for (j = 0; j < 31; ++j) {
373 xhci_dbg_ep_rings(xhci, i, j, &xhci->devs[i]->eps[j]);
374 }
375 }
376 spin_unlock_irqrestore(&xhci->lock, flags);
377
378 if (!xhci->zombie)
379 mod_timer(&xhci->event_ring_timer, jiffies + POLL_TIMEOUT * HZ);
380 else
381 xhci_dbg(xhci, "Quit polling the event ring.\n");
382}
383#endif
384
385static int xhci_run_finished(struct xhci_hcd *xhci)
386{
387 if (xhci_start(xhci)) {
388 xhci_halt(xhci);
389 return -ENODEV;
390 }
391 xhci->shared_hcd->state = HC_STATE_RUNNING;
392
393 if (xhci->quirks & XHCI_NEC_HOST)
394 xhci_ring_cmd_db(xhci);
395
396 xhci_dbg(xhci, "Finished xhci_run for USB3 roothub\n");
397 return 0;
398}
399
400/*
401 * Start the HC after it was halted.
402 *
403 * This function is called by the USB core when the HC driver is added.
404 * Its opposite is xhci_stop().
405 *
406 * xhci_init() must be called once before this function can be called.
407 * Reset the HC, enable device slot contexts, program DCBAAP, and
408 * set command ring pointer and event ring pointer.
409 *
410 * Setup MSI-X vectors and enable interrupts.
411 */
412int xhci_run(struct usb_hcd *hcd)
413{
414 u32 temp;
415 u64 temp_64;
416 u32 ret;
417 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
418 struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
419
420 /* Start the xHCI host controller running only after the USB 2.0 roothub
421 * is setup.
422 */
423
424 hcd->uses_new_polling = 1;
425 if (!usb_hcd_is_primary_hcd(hcd))
426 return xhci_run_finished(xhci);
427
428 xhci_dbg(xhci, "xhci_run\n");
429 /* unregister the legacy interrupt */
430 if (hcd->irq)
431 free_irq(hcd->irq, hcd);
432 hcd->irq = -1;
433
434 /* Some Fresco Logic host controllers advertise MSI, but fail to
435 * generate interrupts. Don't even try to enable MSI.
436 */
437 if (xhci->quirks & XHCI_BROKEN_MSI)
438 goto legacy_irq;
439
440 ret = xhci_setup_msix(xhci);
441 if (ret)
442 /* fall back to msi*/
443 ret = xhci_setup_msi(xhci);
444
445 if (ret) {
446legacy_irq:
447 /* fall back to legacy interrupt*/
448 ret = request_irq(pdev->irq, &usb_hcd_irq, IRQF_SHARED,
449 hcd->irq_descr, hcd);
450 if (ret) {
451 xhci_err(xhci, "request interrupt %d failed\n",
452 pdev->irq);
453 return ret;
454 }
455 hcd->irq = pdev->irq;
456 }
457
458#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
459 init_timer(&xhci->event_ring_timer);
460 xhci->event_ring_timer.data = (unsigned long) xhci;
461 xhci->event_ring_timer.function = xhci_event_ring_work;
462 /* Poll the event ring */
463 xhci->event_ring_timer.expires = jiffies + POLL_TIMEOUT * HZ;
464 xhci->zombie = 0;
465 xhci_dbg(xhci, "Setting event ring polling timer\n");
466 add_timer(&xhci->event_ring_timer);
467#endif
468
469 xhci_dbg(xhci, "Command ring memory map follows:\n");
470 xhci_debug_ring(xhci, xhci->cmd_ring);
471 xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring);
472 xhci_dbg_cmd_ptrs(xhci);
473
474 xhci_dbg(xhci, "ERST memory map follows:\n");
475 xhci_dbg_erst(xhci, &xhci->erst);
476 xhci_dbg(xhci, "Event ring:\n");
477 xhci_debug_ring(xhci, xhci->event_ring);
478 xhci_dbg_ring_ptrs(xhci, xhci->event_ring);
479 temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
480 temp_64 &= ~ERST_PTR_MASK;
481 xhci_dbg(xhci, "ERST deq = 64'h%0lx\n", (long unsigned int) temp_64);
482
483 xhci_dbg(xhci, "// Set the interrupt modulation register\n");
484 temp = xhci_readl(xhci, &xhci->ir_set->irq_control);
485 temp &= ~ER_IRQ_INTERVAL_MASK;
486 temp |= (u32) 160;
487 xhci_writel(xhci, temp, &xhci->ir_set->irq_control);
488
489 /* Set the HCD state before we enable the irqs */
490 temp = xhci_readl(xhci, &xhci->op_regs->command);
491 temp |= (CMD_EIE);
492 xhci_dbg(xhci, "// Enable interrupts, cmd = 0x%x.\n",
493 temp);
494 xhci_writel(xhci, temp, &xhci->op_regs->command);
495
496 temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
497 xhci_dbg(xhci, "// Enabling event ring interrupter %p by writing 0x%x to irq_pending\n",
498 xhci->ir_set, (unsigned int) ER_IRQ_ENABLE(temp));
499 xhci_writel(xhci, ER_IRQ_ENABLE(temp),
500 &xhci->ir_set->irq_pending);
501 xhci_print_ir_set(xhci, 0);
502
503 if (xhci->quirks & XHCI_NEC_HOST)
504 xhci_queue_vendor_command(xhci, 0, 0, 0,
505 TRB_TYPE(TRB_NEC_GET_FW));
506
507 xhci_dbg(xhci, "Finished xhci_run for USB2 roothub\n");
508 return 0;
509}
510
511static void xhci_only_stop_hcd(struct usb_hcd *hcd)
512{
513 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
514
515 spin_lock_irq(&xhci->lock);
516 xhci_halt(xhci);
517
518 /* The shared_hcd is going to be deallocated shortly (the USB core only
519 * calls this function when allocation fails in usb_add_hcd(), or
520 * usb_remove_hcd() is called). So we need to unset xHCI's pointer.
521 */
522 xhci->shared_hcd = NULL;
523 spin_unlock_irq(&xhci->lock);
524}
525
526/*
527 * Stop xHCI driver.
528 *
529 * This function is called by the USB core when the HC driver is removed.
530 * Its opposite is xhci_run().
531 *
532 * Disable device contexts, disable IRQs, and quiesce the HC.
533 * Reset the HC, finish any completed transactions, and cleanup memory.
534 */
535void xhci_stop(struct usb_hcd *hcd)
536{
537 u32 temp;
538 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
539
540 if (!usb_hcd_is_primary_hcd(hcd)) {
541 xhci_only_stop_hcd(xhci->shared_hcd);
542 return;
543 }
544
545 spin_lock_irq(&xhci->lock);
546 /* Make sure the xHC is halted for a USB3 roothub
547 * (xhci_stop() could be called as part of failed init).
548 */
549 xhci_halt(xhci);
550 xhci_reset(xhci);
551 spin_unlock_irq(&xhci->lock);
552
553 xhci_cleanup_msix(xhci);
554
555#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
556 /* Tell the event ring poll function not to reschedule */
557 xhci->zombie = 1;
558 del_timer_sync(&xhci->event_ring_timer);
559#endif
560
561 if (xhci->quirks & XHCI_AMD_PLL_FIX)
562 usb_amd_dev_put();
563
564 xhci_dbg(xhci, "// Disabling event ring interrupts\n");
565 temp = xhci_readl(xhci, &xhci->op_regs->status);
566 xhci_writel(xhci, temp & ~STS_EINT, &xhci->op_regs->status);
567 temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
568 xhci_writel(xhci, ER_IRQ_DISABLE(temp),
569 &xhci->ir_set->irq_pending);
570 xhci_print_ir_set(xhci, 0);
571
572 xhci_dbg(xhci, "cleaning up memory\n");
573 xhci_mem_cleanup(xhci);
574 xhci_dbg(xhci, "xhci_stop completed - status = %x\n",
575 xhci_readl(xhci, &xhci->op_regs->status));
576}
577
578/*
579 * Shutdown HC (not bus-specific)
580 *
581 * This is called when the machine is rebooting or halting. We assume that the
582 * machine will be powered off, and the HC's internal state will be reset.
583 * Don't bother to free memory.
584 *
585 * This will only ever be called with the main usb_hcd (the USB3 roothub).
586 */
587void xhci_shutdown(struct usb_hcd *hcd)
588{
589 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
590
591 spin_lock_irq(&xhci->lock);
592 xhci_halt(xhci);
593 spin_unlock_irq(&xhci->lock);
594
595 xhci_cleanup_msix(xhci);
596
597 xhci_dbg(xhci, "xhci_shutdown completed - status = %x\n",
598 xhci_readl(xhci, &xhci->op_regs->status));
599}
600
601#ifdef CONFIG_PM
602static void xhci_save_registers(struct xhci_hcd *xhci)
603{
604 xhci->s3.command = xhci_readl(xhci, &xhci->op_regs->command);
605 xhci->s3.dev_nt = xhci_readl(xhci, &xhci->op_regs->dev_notification);
606 xhci->s3.dcbaa_ptr = xhci_read_64(xhci, &xhci->op_regs->dcbaa_ptr);
607 xhci->s3.config_reg = xhci_readl(xhci, &xhci->op_regs->config_reg);
608 xhci->s3.irq_pending = xhci_readl(xhci, &xhci->ir_set->irq_pending);
609 xhci->s3.irq_control = xhci_readl(xhci, &xhci->ir_set->irq_control);
610 xhci->s3.erst_size = xhci_readl(xhci, &xhci->ir_set->erst_size);
611 xhci->s3.erst_base = xhci_read_64(xhci, &xhci->ir_set->erst_base);
612 xhci->s3.erst_dequeue = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
613}
614
615static void xhci_restore_registers(struct xhci_hcd *xhci)
616{
617 xhci_writel(xhci, xhci->s3.command, &xhci->op_regs->command);
618 xhci_writel(xhci, xhci->s3.dev_nt, &xhci->op_regs->dev_notification);
619 xhci_write_64(xhci, xhci->s3.dcbaa_ptr, &xhci->op_regs->dcbaa_ptr);
620 xhci_writel(xhci, xhci->s3.config_reg, &xhci->op_regs->config_reg);
621 xhci_writel(xhci, xhci->s3.irq_pending, &xhci->ir_set->irq_pending);
622 xhci_writel(xhci, xhci->s3.irq_control, &xhci->ir_set->irq_control);
623 xhci_writel(xhci, xhci->s3.erst_size, &xhci->ir_set->erst_size);
624 xhci_write_64(xhci, xhci->s3.erst_base, &xhci->ir_set->erst_base);
625}
626
627static void xhci_set_cmd_ring_deq(struct xhci_hcd *xhci)
628{
629 u64 val_64;
630
631 /* step 2: initialize command ring buffer */
632 val_64 = xhci_read_64(xhci, &xhci->op_regs->cmd_ring);
633 val_64 = (val_64 & (u64) CMD_RING_RSVD_BITS) |
634 (xhci_trb_virt_to_dma(xhci->cmd_ring->deq_seg,
635 xhci->cmd_ring->dequeue) &
636 (u64) ~CMD_RING_RSVD_BITS) |
637 xhci->cmd_ring->cycle_state;
638 xhci_dbg(xhci, "// Setting command ring address to 0x%llx\n",
639 (long unsigned long) val_64);
640 xhci_write_64(xhci, val_64, &xhci->op_regs->cmd_ring);
641}
642
643/*
644 * The whole command ring must be cleared to zero when we suspend the host.
645 *
646 * The host doesn't save the command ring pointer in the suspend well, so we
647 * need to re-program it on resume. Unfortunately, the pointer must be 64-byte
648 * aligned, because of the reserved bits in the command ring dequeue pointer
649 * register. Therefore, we can't just set the dequeue pointer back in the
650 * middle of the ring (TRBs are 16-byte aligned).
651 */
652static void xhci_clear_command_ring(struct xhci_hcd *xhci)
653{
654 struct xhci_ring *ring;
655 struct xhci_segment *seg;
656
657 ring = xhci->cmd_ring;
658 seg = ring->deq_seg;
659 do {
660 memset(seg->trbs, 0, SEGMENT_SIZE);
661 seg = seg->next;
662 } while (seg != ring->deq_seg);
663
664 /* Reset the software enqueue and dequeue pointers */
665 ring->deq_seg = ring->first_seg;
666 ring->dequeue = ring->first_seg->trbs;
667 ring->enq_seg = ring->deq_seg;
668 ring->enqueue = ring->dequeue;
669
670 /*
671 * Ring is now zeroed, so the HW should look for change of ownership
672 * when the cycle bit is set to 1.
673 */
674 ring->cycle_state = 1;
675
676 /*
677 * Reset the hardware dequeue pointer.
678 * Yes, this will need to be re-written after resume, but we're paranoid
679 * and want to make sure the hardware doesn't access bogus memory
680 * because, say, the BIOS or an SMI started the host without changing
681 * the command ring pointers.
682 */
683 xhci_set_cmd_ring_deq(xhci);
684}
685
686/*
687 * Stop HC (not bus-specific)
688 *
689 * This is called when the machine transition into S3/S4 mode.
690 *
691 */
692int xhci_suspend(struct xhci_hcd *xhci)
693{
694 int rc = 0;
695 struct usb_hcd *hcd = xhci_to_hcd(xhci);
696 u32 command;
697 int i;
698
699 spin_lock_irq(&xhci->lock);
700 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
701 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags);
702 /* step 1: stop endpoint */
703 /* skipped assuming that port suspend has done */
704
705 /* step 2: clear Run/Stop bit */
706 command = xhci_readl(xhci, &xhci->op_regs->command);
707 command &= ~CMD_RUN;
708 xhci_writel(xhci, command, &xhci->op_regs->command);
709 if (handshake(xhci, &xhci->op_regs->status,
710 STS_HALT, STS_HALT, 100*100)) {
711 xhci_warn(xhci, "WARN: xHC CMD_RUN timeout\n");
712 spin_unlock_irq(&xhci->lock);
713 return -ETIMEDOUT;
714 }
715 xhci_clear_command_ring(xhci);
716
717 /* step 3: save registers */
718 xhci_save_registers(xhci);
719
720 /* step 4: set CSS flag */
721 command = xhci_readl(xhci, &xhci->op_regs->command);
722 command |= CMD_CSS;
723 xhci_writel(xhci, command, &xhci->op_regs->command);
724 if (handshake(xhci, &xhci->op_regs->status, STS_SAVE, 0, 10*100)) {
725 xhci_warn(xhci, "WARN: xHC CMD_CSS timeout\n");
726 spin_unlock_irq(&xhci->lock);
727 return -ETIMEDOUT;
728 }
729 spin_unlock_irq(&xhci->lock);
730
731 /* step 5: remove core well power */
732 /* synchronize irq when using MSI-X */
733 if (xhci->msix_entries) {
734 for (i = 0; i < xhci->msix_count; i++)
735 synchronize_irq(xhci->msix_entries[i].vector);
736 }
737
738 return rc;
739}
740
741/*
742 * start xHC (not bus-specific)
743 *
744 * This is called when the machine transition from S3/S4 mode.
745 *
746 */
747int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
748{
749 u32 command, temp = 0;
750 struct usb_hcd *hcd = xhci_to_hcd(xhci);
751 struct usb_hcd *secondary_hcd;
752 int retval;
753
754 /* Wait a bit if either of the roothubs need to settle from the
755 * transition into bus suspend.
756 */
757 if (time_before(jiffies, xhci->bus_state[0].next_statechange) ||
758 time_before(jiffies,
759 xhci->bus_state[1].next_statechange))
760 msleep(100);
761
762 spin_lock_irq(&xhci->lock);
763 if (xhci->quirks & XHCI_RESET_ON_RESUME)
764 hibernated = true;
765
766 if (!hibernated) {
767 /* step 1: restore register */
768 xhci_restore_registers(xhci);
769 /* step 2: initialize command ring buffer */
770 xhci_set_cmd_ring_deq(xhci);
771 /* step 3: restore state and start state*/
772 /* step 3: set CRS flag */
773 command = xhci_readl(xhci, &xhci->op_regs->command);
774 command |= CMD_CRS;
775 xhci_writel(xhci, command, &xhci->op_regs->command);
776 if (handshake(xhci, &xhci->op_regs->status,
777 STS_RESTORE, 0, 10*100)) {
778 xhci_dbg(xhci, "WARN: xHC CMD_CSS timeout\n");
779 spin_unlock_irq(&xhci->lock);
780 return -ETIMEDOUT;
781 }
782 temp = xhci_readl(xhci, &xhci->op_regs->status);
783 }
784
785 /* If restore operation fails, re-initialize the HC during resume */
786 if ((temp & STS_SRE) || hibernated) {
787 /* Let the USB core know _both_ roothubs lost power. */
788 usb_root_hub_lost_power(xhci->main_hcd->self.root_hub);
789 usb_root_hub_lost_power(xhci->shared_hcd->self.root_hub);
790
791 xhci_dbg(xhci, "Stop HCD\n");
792 xhci_halt(xhci);
793 xhci_reset(xhci);
794 spin_unlock_irq(&xhci->lock);
795 xhci_cleanup_msix(xhci);
796
797#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
798 /* Tell the event ring poll function not to reschedule */
799 xhci->zombie = 1;
800 del_timer_sync(&xhci->event_ring_timer);
801#endif
802
803 xhci_dbg(xhci, "// Disabling event ring interrupts\n");
804 temp = xhci_readl(xhci, &xhci->op_regs->status);
805 xhci_writel(xhci, temp & ~STS_EINT, &xhci->op_regs->status);
806 temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
807 xhci_writel(xhci, ER_IRQ_DISABLE(temp),
808 &xhci->ir_set->irq_pending);
809 xhci_print_ir_set(xhci, 0);
810
811 xhci_dbg(xhci, "cleaning up memory\n");
812 xhci_mem_cleanup(xhci);
813 xhci_dbg(xhci, "xhci_stop completed - status = %x\n",
814 xhci_readl(xhci, &xhci->op_regs->status));
815
816 /* USB core calls the PCI reinit and start functions twice:
817 * first with the primary HCD, and then with the secondary HCD.
818 * If we don't do the same, the host will never be started.
819 */
820 if (!usb_hcd_is_primary_hcd(hcd))
821 secondary_hcd = hcd;
822 else
823 secondary_hcd = xhci->shared_hcd;
824
825 xhci_dbg(xhci, "Initialize the xhci_hcd\n");
826 retval = xhci_init(hcd->primary_hcd);
827 if (retval)
828 return retval;
829 xhci_dbg(xhci, "Start the primary HCD\n");
830 retval = xhci_run(hcd->primary_hcd);
831 if (retval)
832 goto failed_restart;
833
834 xhci_dbg(xhci, "Start the secondary HCD\n");
835 retval = xhci_run(secondary_hcd);
836 if (!retval) {
837 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
838 set_bit(HCD_FLAG_HW_ACCESSIBLE,
839 &xhci->shared_hcd->flags);
840 }
841failed_restart:
842 hcd->state = HC_STATE_SUSPENDED;
843 xhci->shared_hcd->state = HC_STATE_SUSPENDED;
844 return retval;
845 }
846
847 /* step 4: set Run/Stop bit */
848 command = xhci_readl(xhci, &xhci->op_regs->command);
849 command |= CMD_RUN;
850 xhci_writel(xhci, command, &xhci->op_regs->command);
851 handshake(xhci, &xhci->op_regs->status, STS_HALT,
852 0, 250 * 1000);
853
854 /* step 5: walk topology and initialize portsc,
855 * portpmsc and portli
856 */
857 /* this is done in bus_resume */
858
859 /* step 6: restart each of the previously
860 * Running endpoints by ringing their doorbells
861 */
862
863 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
864 set_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags);
865
866 spin_unlock_irq(&xhci->lock);
867 return 0;
868}
869#endif /* CONFIG_PM */
870
871/*-------------------------------------------------------------------------*/
872
873/**
874 * xhci_get_endpoint_index - Used for passing endpoint bitmasks between the core and
875 * HCDs. Find the index for an endpoint given its descriptor. Use the return
876 * value to right shift 1 for the bitmask.
877 *
878 * Index = (epnum * 2) + direction - 1,
879 * where direction = 0 for OUT, 1 for IN.
880 * For control endpoints, the IN index is used (OUT index is unused), so
881 * index = (epnum * 2) + direction - 1 = (epnum * 2) + 1 - 1 = (epnum * 2)
882 */
883unsigned int xhci_get_endpoint_index(struct usb_endpoint_descriptor *desc)
884{
885 unsigned int index;
886 if (usb_endpoint_xfer_control(desc))
887 index = (unsigned int) (usb_endpoint_num(desc)*2);
888 else
889 index = (unsigned int) (usb_endpoint_num(desc)*2) +
890 (usb_endpoint_dir_in(desc) ? 1 : 0) - 1;
891 return index;
892}
893
894/* Find the flag for this endpoint (for use in the control context). Use the
895 * endpoint index to create a bitmask. The slot context is bit 0, endpoint 0 is
896 * bit 1, etc.
897 */
898unsigned int xhci_get_endpoint_flag(struct usb_endpoint_descriptor *desc)
899{
900 return 1 << (xhci_get_endpoint_index(desc) + 1);
901}
902
903/* Find the flag for this endpoint (for use in the control context). Use the
904 * endpoint index to create a bitmask. The slot context is bit 0, endpoint 0 is
905 * bit 1, etc.
906 */
907unsigned int xhci_get_endpoint_flag_from_index(unsigned int ep_index)
908{
909 return 1 << (ep_index + 1);
910}
911
912/* Compute the last valid endpoint context index. Basically, this is the
913 * endpoint index plus one. For slot contexts with more than valid endpoint,
914 * we find the most significant bit set in the added contexts flags.
915 * e.g. ep 1 IN (with epnum 0x81) => added_ctxs = 0b1000
916 * fls(0b1000) = 4, but the endpoint context index is 3, so subtract one.
917 */
918unsigned int xhci_last_valid_endpoint(u32 added_ctxs)
919{
920 return fls(added_ctxs) - 1;
921}
922
923/* Returns 1 if the arguments are OK;
924 * returns 0 this is a root hub; returns -EINVAL for NULL pointers.
925 */
926static int xhci_check_args(struct usb_hcd *hcd, struct usb_device *udev,
927 struct usb_host_endpoint *ep, int check_ep, bool check_virt_dev,
928 const char *func) {
929 struct xhci_hcd *xhci;
930 struct xhci_virt_device *virt_dev;
931
932 if (!hcd || (check_ep && !ep) || !udev) {
933 printk(KERN_DEBUG "xHCI %s called with invalid args\n",
934 func);
935 return -EINVAL;
936 }
937 if (!udev->parent) {
938 printk(KERN_DEBUG "xHCI %s called for root hub\n",
939 func);
940 return 0;
941 }
942
943 xhci = hcd_to_xhci(hcd);
944 if (xhci->xhc_state & XHCI_STATE_HALTED)
945 return -ENODEV;
946
947 if (check_virt_dev) {
948 if (!udev->slot_id || !xhci->devs
949 || !xhci->devs[udev->slot_id]) {
950 printk(KERN_DEBUG "xHCI %s called with unaddressed "
951 "device\n", func);
952 return -EINVAL;
953 }
954
955 virt_dev = xhci->devs[udev->slot_id];
956 if (virt_dev->udev != udev) {
957 printk(KERN_DEBUG "xHCI %s called with udev and "
958 "virt_dev does not match\n", func);
959 return -EINVAL;
960 }
961 }
962
963 return 1;
964}
965
966static int xhci_configure_endpoint(struct xhci_hcd *xhci,
967 struct usb_device *udev, struct xhci_command *command,
968 bool ctx_change, bool must_succeed);
969
970/*
971 * Full speed devices may have a max packet size greater than 8 bytes, but the
972 * USB core doesn't know that until it reads the first 8 bytes of the
973 * descriptor. If the usb_device's max packet size changes after that point,
974 * we need to issue an evaluate context command and wait on it.
975 */
976static int xhci_check_maxpacket(struct xhci_hcd *xhci, unsigned int slot_id,
977 unsigned int ep_index, struct urb *urb)
978{
979 struct xhci_container_ctx *in_ctx;
980 struct xhci_container_ctx *out_ctx;
981 struct xhci_input_control_ctx *ctrl_ctx;
982 struct xhci_ep_ctx *ep_ctx;
983 int max_packet_size;
984 int hw_max_packet_size;
985 int ret = 0;
986
987 out_ctx = xhci->devs[slot_id]->out_ctx;
988 ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
989 hw_max_packet_size = MAX_PACKET_DECODED(le32_to_cpu(ep_ctx->ep_info2));
990 max_packet_size = le16_to_cpu(urb->dev->ep0.desc.wMaxPacketSize);
991 if (hw_max_packet_size != max_packet_size) {
992 xhci_dbg(xhci, "Max Packet Size for ep 0 changed.\n");
993 xhci_dbg(xhci, "Max packet size in usb_device = %d\n",
994 max_packet_size);
995 xhci_dbg(xhci, "Max packet size in xHCI HW = %d\n",
996 hw_max_packet_size);
997 xhci_dbg(xhci, "Issuing evaluate context command.\n");
998
999 /* Set up the modified control endpoint 0 */
1000 xhci_endpoint_copy(xhci, xhci->devs[slot_id]->in_ctx,
1001 xhci->devs[slot_id]->out_ctx, ep_index);
1002 in_ctx = xhci->devs[slot_id]->in_ctx;
1003 ep_ctx = xhci_get_ep_ctx(xhci, in_ctx, ep_index);
1004 ep_ctx->ep_info2 &= cpu_to_le32(~MAX_PACKET_MASK);
1005 ep_ctx->ep_info2 |= cpu_to_le32(MAX_PACKET(max_packet_size));
1006
1007 /* Set up the input context flags for the command */
1008 /* FIXME: This won't work if a non-default control endpoint
1009 * changes max packet sizes.
1010 */
1011 ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
1012 ctrl_ctx->add_flags = cpu_to_le32(EP0_FLAG);
1013 ctrl_ctx->drop_flags = 0;
1014
1015 xhci_dbg(xhci, "Slot %d input context\n", slot_id);
1016 xhci_dbg_ctx(xhci, in_ctx, ep_index);
1017 xhci_dbg(xhci, "Slot %d output context\n", slot_id);
1018 xhci_dbg_ctx(xhci, out_ctx, ep_index);
1019
1020 ret = xhci_configure_endpoint(xhci, urb->dev, NULL,
1021 true, false);
1022
1023 /* Clean up the input context for later use by bandwidth
1024 * functions.
1025 */
1026 ctrl_ctx->add_flags = cpu_to_le32(SLOT_FLAG);
1027 }
1028 return ret;
1029}
1030
1031/*
1032 * non-error returns are a promise to giveback() the urb later
1033 * we drop ownership so next owner (or urb unlink) can get it
1034 */
1035int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
1036{
1037 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1038 unsigned long flags;
1039 int ret = 0;
1040 unsigned int slot_id, ep_index;
1041 struct urb_priv *urb_priv;
1042 int size, i;
1043
1044 if (!urb || xhci_check_args(hcd, urb->dev, urb->ep,
1045 true, true, __func__) <= 0)
1046 return -EINVAL;
1047
1048 slot_id = urb->dev->slot_id;
1049 ep_index = xhci_get_endpoint_index(&urb->ep->desc);
1050
1051 if (!HCD_HW_ACCESSIBLE(hcd)) {
1052 if (!in_interrupt())
1053 xhci_dbg(xhci, "urb submitted during PCI suspend\n");
1054 ret = -ESHUTDOWN;
1055 goto exit;
1056 }
1057
1058 if (usb_endpoint_xfer_isoc(&urb->ep->desc))
1059 size = urb->number_of_packets;
1060 else
1061 size = 1;
1062
1063 urb_priv = kzalloc(sizeof(struct urb_priv) +
1064 size * sizeof(struct xhci_td *), mem_flags);
1065 if (!urb_priv)
1066 return -ENOMEM;
1067
1068 for (i = 0; i < size; i++) {
1069 urb_priv->td[i] = kzalloc(sizeof(struct xhci_td), mem_flags);
1070 if (!urb_priv->td[i]) {
1071 urb_priv->length = i;
1072 xhci_urb_free_priv(xhci, urb_priv);
1073 return -ENOMEM;
1074 }
1075 }
1076
1077 urb_priv->length = size;
1078 urb_priv->td_cnt = 0;
1079 urb->hcpriv = urb_priv;
1080
1081 if (usb_endpoint_xfer_control(&urb->ep->desc)) {
1082 /* Check to see if the max packet size for the default control
1083 * endpoint changed during FS device enumeration
1084 */
1085 if (urb->dev->speed == USB_SPEED_FULL) {
1086 ret = xhci_check_maxpacket(xhci, slot_id,
1087 ep_index, urb);
1088 if (ret < 0) {
1089 xhci_urb_free_priv(xhci, urb_priv);
1090 urb->hcpriv = NULL;
1091 return ret;
1092 }
1093 }
1094
1095 /* We have a spinlock and interrupts disabled, so we must pass
1096 * atomic context to this function, which may allocate memory.
1097 */
1098 spin_lock_irqsave(&xhci->lock, flags);
1099 if (xhci->xhc_state & XHCI_STATE_DYING)
1100 goto dying;
1101 ret = xhci_queue_ctrl_tx(xhci, GFP_ATOMIC, urb,
1102 slot_id, ep_index);
1103 if (ret)
1104 goto free_priv;
1105 spin_unlock_irqrestore(&xhci->lock, flags);
1106 } else if (usb_endpoint_xfer_bulk(&urb->ep->desc)) {
1107 spin_lock_irqsave(&xhci->lock, flags);
1108 if (xhci->xhc_state & XHCI_STATE_DYING)
1109 goto dying;
1110 if (xhci->devs[slot_id]->eps[ep_index].ep_state &
1111 EP_GETTING_STREAMS) {
1112 xhci_warn(xhci, "WARN: Can't enqueue URB while bulk ep "
1113 "is transitioning to using streams.\n");
1114 ret = -EINVAL;
1115 } else if (xhci->devs[slot_id]->eps[ep_index].ep_state &
1116 EP_GETTING_NO_STREAMS) {
1117 xhci_warn(xhci, "WARN: Can't enqueue URB while bulk ep "
1118 "is transitioning to "
1119 "not having streams.\n");
1120 ret = -EINVAL;
1121 } else {
1122 ret = xhci_queue_bulk_tx(xhci, GFP_ATOMIC, urb,
1123 slot_id, ep_index);
1124 }
1125 if (ret)
1126 goto free_priv;
1127 spin_unlock_irqrestore(&xhci->lock, flags);
1128 } else if (usb_endpoint_xfer_int(&urb->ep->desc)) {
1129 spin_lock_irqsave(&xhci->lock, flags);
1130 if (xhci->xhc_state & XHCI_STATE_DYING)
1131 goto dying;
1132 ret = xhci_queue_intr_tx(xhci, GFP_ATOMIC, urb,
1133 slot_id, ep_index);
1134 if (ret)
1135 goto free_priv;
1136 spin_unlock_irqrestore(&xhci->lock, flags);
1137 } else {
1138 spin_lock_irqsave(&xhci->lock, flags);
1139 if (xhci->xhc_state & XHCI_STATE_DYING)
1140 goto dying;
1141 ret = xhci_queue_isoc_tx_prepare(xhci, GFP_ATOMIC, urb,
1142 slot_id, ep_index);
1143 if (ret)
1144 goto free_priv;
1145 spin_unlock_irqrestore(&xhci->lock, flags);
1146 }
1147exit:
1148 return ret;
1149dying:
1150 xhci_dbg(xhci, "Ep 0x%x: URB %p submitted for "
1151 "non-responsive xHCI host.\n",
1152 urb->ep->desc.bEndpointAddress, urb);
1153 ret = -ESHUTDOWN;
1154free_priv:
1155 xhci_urb_free_priv(xhci, urb_priv);
1156 urb->hcpriv = NULL;
1157 spin_unlock_irqrestore(&xhci->lock, flags);
1158 return ret;
1159}
1160
1161/* Get the right ring for the given URB.
1162 * If the endpoint supports streams, boundary check the URB's stream ID.
1163 * If the endpoint doesn't support streams, return the singular endpoint ring.
1164 */
1165static struct xhci_ring *xhci_urb_to_transfer_ring(struct xhci_hcd *xhci,
1166 struct urb *urb)
1167{
1168 unsigned int slot_id;
1169 unsigned int ep_index;
1170 unsigned int stream_id;
1171 struct xhci_virt_ep *ep;
1172
1173 slot_id = urb->dev->slot_id;
1174 ep_index = xhci_get_endpoint_index(&urb->ep->desc);
1175 stream_id = urb->stream_id;
1176 ep = &xhci->devs[slot_id]->eps[ep_index];
1177 /* Common case: no streams */
1178 if (!(ep->ep_state & EP_HAS_STREAMS))
1179 return ep->ring;
1180
1181 if (stream_id == 0) {
1182 xhci_warn(xhci,
1183 "WARN: Slot ID %u, ep index %u has streams, "
1184 "but URB has no stream ID.\n",
1185 slot_id, ep_index);
1186 return NULL;
1187 }
1188
1189 if (stream_id < ep->stream_info->num_streams)
1190 return ep->stream_info->stream_rings[stream_id];
1191
1192 xhci_warn(xhci,
1193 "WARN: Slot ID %u, ep index %u has "
1194 "stream IDs 1 to %u allocated, "
1195 "but stream ID %u is requested.\n",
1196 slot_id, ep_index,
1197 ep->stream_info->num_streams - 1,
1198 stream_id);
1199 return NULL;
1200}
1201
1202/*
1203 * Remove the URB's TD from the endpoint ring. This may cause the HC to stop
1204 * USB transfers, potentially stopping in the middle of a TRB buffer. The HC
1205 * should pick up where it left off in the TD, unless a Set Transfer Ring
1206 * Dequeue Pointer is issued.
1207 *
1208 * The TRBs that make up the buffers for the canceled URB will be "removed" from
1209 * the ring. Since the ring is a contiguous structure, they can't be physically
1210 * removed. Instead, there are two options:
1211 *
1212 * 1) If the HC is in the middle of processing the URB to be canceled, we
1213 * simply move the ring's dequeue pointer past those TRBs using the Set
1214 * Transfer Ring Dequeue Pointer command. This will be the common case,
1215 * when drivers timeout on the last submitted URB and attempt to cancel.
1216 *
1217 * 2) If the HC is in the middle of a different TD, we turn the TRBs into a
1218 * series of 1-TRB transfer no-op TDs. (No-ops shouldn't be chained.) The
1219 * HC will need to invalidate the any TRBs it has cached after the stop
1220 * endpoint command, as noted in the xHCI 0.95 errata.
1221 *
1222 * 3) The TD may have completed by the time the Stop Endpoint Command
1223 * completes, so software needs to handle that case too.
1224 *
1225 * This function should protect against the TD enqueueing code ringing the
1226 * doorbell while this code is waiting for a Stop Endpoint command to complete.
1227 * It also needs to account for multiple cancellations on happening at the same
1228 * time for the same endpoint.
1229 *
1230 * Note that this function can be called in any context, or so says
1231 * usb_hcd_unlink_urb()
1232 */
1233int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1234{
1235 unsigned long flags;
1236 int ret, i;
1237 u32 temp;
1238 struct xhci_hcd *xhci;
1239 struct urb_priv *urb_priv;
1240 struct xhci_td *td;
1241 unsigned int ep_index;
1242 struct xhci_ring *ep_ring;
1243 struct xhci_virt_ep *ep;
1244
1245 xhci = hcd_to_xhci(hcd);
1246 spin_lock_irqsave(&xhci->lock, flags);
1247 /* Make sure the URB hasn't completed or been unlinked already */
1248 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
1249 if (ret || !urb->hcpriv)
1250 goto done;
1251 temp = xhci_readl(xhci, &xhci->op_regs->status);
1252 if (temp == 0xffffffff || (xhci->xhc_state & XHCI_STATE_HALTED)) {
1253 xhci_dbg(xhci, "HW died, freeing TD.\n");
1254 urb_priv = urb->hcpriv;
1255 for (i = urb_priv->td_cnt; i < urb_priv->length; i++) {
1256 td = urb_priv->td[i];
1257 if (!list_empty(&td->td_list))
1258 list_del_init(&td->td_list);
1259 if (!list_empty(&td->cancelled_td_list))
1260 list_del_init(&td->cancelled_td_list);
1261 }
1262
1263 usb_hcd_unlink_urb_from_ep(hcd, urb);
1264 spin_unlock_irqrestore(&xhci->lock, flags);
1265 usb_hcd_giveback_urb(hcd, urb, -ESHUTDOWN);
1266 xhci_urb_free_priv(xhci, urb_priv);
1267 return ret;
1268 }
1269 if ((xhci->xhc_state & XHCI_STATE_DYING) ||
1270 (xhci->xhc_state & XHCI_STATE_HALTED)) {
1271 xhci_dbg(xhci, "Ep 0x%x: URB %p to be canceled on "
1272 "non-responsive xHCI host.\n",
1273 urb->ep->desc.bEndpointAddress, urb);
1274 /* Let the stop endpoint command watchdog timer (which set this
1275 * state) finish cleaning up the endpoint TD lists. We must
1276 * have caught it in the middle of dropping a lock and giving
1277 * back an URB.
1278 */
1279 goto done;
1280 }
1281
1282 xhci_dbg(xhci, "Cancel URB %p\n", urb);
1283 xhci_dbg(xhci, "Event ring:\n");
1284 xhci_debug_ring(xhci, xhci->event_ring);
1285 ep_index = xhci_get_endpoint_index(&urb->ep->desc);
1286 ep = &xhci->devs[urb->dev->slot_id]->eps[ep_index];
1287 ep_ring = xhci_urb_to_transfer_ring(xhci, urb);
1288 if (!ep_ring) {
1289 ret = -EINVAL;
1290 goto done;
1291 }
1292
1293 xhci_dbg(xhci, "Endpoint ring:\n");
1294 xhci_debug_ring(xhci, ep_ring);
1295
1296 urb_priv = urb->hcpriv;
1297
1298 for (i = urb_priv->td_cnt; i < urb_priv->length; i++) {
1299 td = urb_priv->td[i];
1300 list_add_tail(&td->cancelled_td_list, &ep->cancelled_td_list);
1301 }
1302
1303 /* Queue a stop endpoint command, but only if this is
1304 * the first cancellation to be handled.
1305 */
1306 if (!(ep->ep_state & EP_HALT_PENDING)) {
1307 ep->ep_state |= EP_HALT_PENDING;
1308 ep->stop_cmds_pending++;
1309 ep->stop_cmd_timer.expires = jiffies +
1310 XHCI_STOP_EP_CMD_TIMEOUT * HZ;
1311 add_timer(&ep->stop_cmd_timer);
1312 xhci_queue_stop_endpoint(xhci, urb->dev->slot_id, ep_index, 0);
1313 xhci_ring_cmd_db(xhci);
1314 }
1315done:
1316 spin_unlock_irqrestore(&xhci->lock, flags);
1317 return ret;
1318}
1319
1320/* Drop an endpoint from a new bandwidth configuration for this device.
1321 * Only one call to this function is allowed per endpoint before
1322 * check_bandwidth() or reset_bandwidth() must be called.
1323 * A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will
1324 * add the endpoint to the schedule with possibly new parameters denoted by a
1325 * different endpoint descriptor in usb_host_endpoint.
1326 * A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is
1327 * not allowed.
1328 *
1329 * The USB core will not allow URBs to be queued to an endpoint that is being
1330 * disabled, so there's no need for mutual exclusion to protect
1331 * the xhci->devs[slot_id] structure.
1332 */
1333int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
1334 struct usb_host_endpoint *ep)
1335{
1336 struct xhci_hcd *xhci;
1337 struct xhci_container_ctx *in_ctx, *out_ctx;
1338 struct xhci_input_control_ctx *ctrl_ctx;
1339 struct xhci_slot_ctx *slot_ctx;
1340 unsigned int last_ctx;
1341 unsigned int ep_index;
1342 struct xhci_ep_ctx *ep_ctx;
1343 u32 drop_flag;
1344 u32 new_add_flags, new_drop_flags, new_slot_info;
1345 int ret;
1346
1347 ret = xhci_check_args(hcd, udev, ep, 1, true, __func__);
1348 if (ret <= 0)
1349 return ret;
1350 xhci = hcd_to_xhci(hcd);
1351 if (xhci->xhc_state & XHCI_STATE_DYING)
1352 return -ENODEV;
1353
1354 xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
1355 drop_flag = xhci_get_endpoint_flag(&ep->desc);
1356 if (drop_flag == SLOT_FLAG || drop_flag == EP0_FLAG) {
1357 xhci_dbg(xhci, "xHCI %s - can't drop slot or ep 0 %#x\n",
1358 __func__, drop_flag);
1359 return 0;
1360 }
1361
1362 in_ctx = xhci->devs[udev->slot_id]->in_ctx;
1363 out_ctx = xhci->devs[udev->slot_id]->out_ctx;
1364 ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
1365 ep_index = xhci_get_endpoint_index(&ep->desc);
1366 ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
1367 /* If the HC already knows the endpoint is disabled,
1368 * or the HCD has noted it is disabled, ignore this request
1369 */
1370 if (((ep_ctx->ep_info & cpu_to_le32(EP_STATE_MASK)) ==
1371 cpu_to_le32(EP_STATE_DISABLED)) ||
1372 le32_to_cpu(ctrl_ctx->drop_flags) &
1373 xhci_get_endpoint_flag(&ep->desc)) {
1374 xhci_warn(xhci, "xHCI %s called with disabled ep %p\n",
1375 __func__, ep);
1376 return 0;
1377 }
1378
1379 ctrl_ctx->drop_flags |= cpu_to_le32(drop_flag);
1380 new_drop_flags = le32_to_cpu(ctrl_ctx->drop_flags);
1381
1382 ctrl_ctx->add_flags &= cpu_to_le32(~drop_flag);
1383 new_add_flags = le32_to_cpu(ctrl_ctx->add_flags);
1384
1385 last_ctx = xhci_last_valid_endpoint(le32_to_cpu(ctrl_ctx->add_flags));
1386 slot_ctx = xhci_get_slot_ctx(xhci, in_ctx);
1387 /* Update the last valid endpoint context, if we deleted the last one */
1388 if ((le32_to_cpu(slot_ctx->dev_info) & LAST_CTX_MASK) >
1389 LAST_CTX(last_ctx)) {
1390 slot_ctx->dev_info &= cpu_to_le32(~LAST_CTX_MASK);
1391 slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(last_ctx));
1392 }
1393 new_slot_info = le32_to_cpu(slot_ctx->dev_info);
1394
1395 xhci_endpoint_zero(xhci, xhci->devs[udev->slot_id], ep);
1396
1397 xhci_dbg(xhci, "drop ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x, new slot info = %#x\n",
1398 (unsigned int) ep->desc.bEndpointAddress,
1399 udev->slot_id,
1400 (unsigned int) new_drop_flags,
1401 (unsigned int) new_add_flags,
1402 (unsigned int) new_slot_info);
1403 return 0;
1404}
1405
1406/* Add an endpoint to a new possible bandwidth configuration for this device.
1407 * Only one call to this function is allowed per endpoint before
1408 * check_bandwidth() or reset_bandwidth() must be called.
1409 * A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will
1410 * add the endpoint to the schedule with possibly new parameters denoted by a
1411 * different endpoint descriptor in usb_host_endpoint.
1412 * A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is
1413 * not allowed.
1414 *
1415 * The USB core will not allow URBs to be queued to an endpoint until the
1416 * configuration or alt setting is installed in the device, so there's no need
1417 * for mutual exclusion to protect the xhci->devs[slot_id] structure.
1418 */
1419int xhci_add_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
1420 struct usb_host_endpoint *ep)
1421{
1422 struct xhci_hcd *xhci;
1423 struct xhci_container_ctx *in_ctx, *out_ctx;
1424 unsigned int ep_index;
1425 struct xhci_ep_ctx *ep_ctx;
1426 struct xhci_slot_ctx *slot_ctx;
1427 struct xhci_input_control_ctx *ctrl_ctx;
1428 u32 added_ctxs;
1429 unsigned int last_ctx;
1430 u32 new_add_flags, new_drop_flags, new_slot_info;
1431 struct xhci_virt_device *virt_dev;
1432 int ret = 0;
1433
1434 ret = xhci_check_args(hcd, udev, ep, 1, true, __func__);
1435 if (ret <= 0) {
1436 /* So we won't queue a reset ep command for a root hub */
1437 ep->hcpriv = NULL;
1438 return ret;
1439 }
1440 xhci = hcd_to_xhci(hcd);
1441 if (xhci->xhc_state & XHCI_STATE_DYING)
1442 return -ENODEV;
1443
1444 added_ctxs = xhci_get_endpoint_flag(&ep->desc);
1445 last_ctx = xhci_last_valid_endpoint(added_ctxs);
1446 if (added_ctxs == SLOT_FLAG || added_ctxs == EP0_FLAG) {
1447 /* FIXME when we have to issue an evaluate endpoint command to
1448 * deal with ep0 max packet size changing once we get the
1449 * descriptors
1450 */
1451 xhci_dbg(xhci, "xHCI %s - can't add slot or ep 0 %#x\n",
1452 __func__, added_ctxs);
1453 return 0;
1454 }
1455
1456 virt_dev = xhci->devs[udev->slot_id];
1457 in_ctx = virt_dev->in_ctx;
1458 out_ctx = virt_dev->out_ctx;
1459 ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
1460 ep_index = xhci_get_endpoint_index(&ep->desc);
1461 ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
1462
1463 /* If this endpoint is already in use, and the upper layers are trying
1464 * to add it again without dropping it, reject the addition.
1465 */
1466 if (virt_dev->eps[ep_index].ring &&
1467 !(le32_to_cpu(ctrl_ctx->drop_flags) &
1468 xhci_get_endpoint_flag(&ep->desc))) {
1469 xhci_warn(xhci, "Trying to add endpoint 0x%x "
1470 "without dropping it.\n",
1471 (unsigned int) ep->desc.bEndpointAddress);
1472 return -EINVAL;
1473 }
1474
1475 /* If the HCD has already noted the endpoint is enabled,
1476 * ignore this request.
1477 */
1478 if (le32_to_cpu(ctrl_ctx->add_flags) &
1479 xhci_get_endpoint_flag(&ep->desc)) {
1480 xhci_warn(xhci, "xHCI %s called with enabled ep %p\n",
1481 __func__, ep);
1482 return 0;
1483 }
1484
1485 /*
1486 * Configuration and alternate setting changes must be done in
1487 * process context, not interrupt context (or so documenation
1488 * for usb_set_interface() and usb_set_configuration() claim).
1489 */
1490 if (xhci_endpoint_init(xhci, virt_dev, udev, ep, GFP_NOIO) < 0) {
1491 dev_dbg(&udev->dev, "%s - could not initialize ep %#x\n",
1492 __func__, ep->desc.bEndpointAddress);
1493 return -ENOMEM;
1494 }
1495
1496 ctrl_ctx->add_flags |= cpu_to_le32(added_ctxs);
1497 new_add_flags = le32_to_cpu(ctrl_ctx->add_flags);
1498
1499 /* If xhci_endpoint_disable() was called for this endpoint, but the
1500 * xHC hasn't been notified yet through the check_bandwidth() call,
1501 * this re-adds a new state for the endpoint from the new endpoint
1502 * descriptors. We must drop and re-add this endpoint, so we leave the
1503 * drop flags alone.
1504 */
1505 new_drop_flags = le32_to_cpu(ctrl_ctx->drop_flags);
1506
1507 slot_ctx = xhci_get_slot_ctx(xhci, in_ctx);
1508 /* Update the last valid endpoint context, if we just added one past */
1509 if ((le32_to_cpu(slot_ctx->dev_info) & LAST_CTX_MASK) <
1510 LAST_CTX(last_ctx)) {
1511 slot_ctx->dev_info &= cpu_to_le32(~LAST_CTX_MASK);
1512 slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(last_ctx));
1513 }
1514 new_slot_info = le32_to_cpu(slot_ctx->dev_info);
1515
1516 /* Store the usb_device pointer for later use */
1517 ep->hcpriv = udev;
1518
1519 xhci_dbg(xhci, "add ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x, new slot info = %#x\n",
1520 (unsigned int) ep->desc.bEndpointAddress,
1521 udev->slot_id,
1522 (unsigned int) new_drop_flags,
1523 (unsigned int) new_add_flags,
1524 (unsigned int) new_slot_info);
1525 return 0;
1526}
1527
1528static void xhci_zero_in_ctx(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev)
1529{
1530 struct xhci_input_control_ctx *ctrl_ctx;
1531 struct xhci_ep_ctx *ep_ctx;
1532 struct xhci_slot_ctx *slot_ctx;
1533 int i;
1534
1535 /* When a device's add flag and drop flag are zero, any subsequent
1536 * configure endpoint command will leave that endpoint's state
1537 * untouched. Make sure we don't leave any old state in the input
1538 * endpoint contexts.
1539 */
1540 ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
1541 ctrl_ctx->drop_flags = 0;
1542 ctrl_ctx->add_flags = 0;
1543 slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
1544 slot_ctx->dev_info &= cpu_to_le32(~LAST_CTX_MASK);
1545 /* Endpoint 0 is always valid */
1546 slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(1));
1547 for (i = 1; i < 31; ++i) {
1548 ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, i);
1549 ep_ctx->ep_info = 0;
1550 ep_ctx->ep_info2 = 0;
1551 ep_ctx->deq = 0;
1552 ep_ctx->tx_info = 0;
1553 }
1554}
1555
1556static int xhci_configure_endpoint_result(struct xhci_hcd *xhci,
1557 struct usb_device *udev, u32 *cmd_status)
1558{
1559 int ret;
1560
1561 switch (*cmd_status) {
1562 case COMP_ENOMEM:
1563 dev_warn(&udev->dev, "Not enough host controller resources "
1564 "for new device state.\n");
1565 ret = -ENOMEM;
1566 /* FIXME: can we allocate more resources for the HC? */
1567 break;
1568 case COMP_BW_ERR:
1569 dev_warn(&udev->dev, "Not enough bandwidth "
1570 "for new device state.\n");
1571 ret = -ENOSPC;
1572 /* FIXME: can we go back to the old state? */
1573 break;
1574 case COMP_TRB_ERR:
1575 /* the HCD set up something wrong */
1576 dev_warn(&udev->dev, "ERROR: Endpoint drop flag = 0, "
1577 "add flag = 1, "
1578 "and endpoint is not disabled.\n");
1579 ret = -EINVAL;
1580 break;
1581 case COMP_DEV_ERR:
1582 dev_warn(&udev->dev, "ERROR: Incompatible device for endpoint "
1583 "configure command.\n");
1584 ret = -ENODEV;
1585 break;
1586 case COMP_SUCCESS:
1587 dev_dbg(&udev->dev, "Successful Endpoint Configure command\n");
1588 ret = 0;
1589 break;
1590 default:
1591 xhci_err(xhci, "ERROR: unexpected command completion "
1592 "code 0x%x.\n", *cmd_status);
1593 ret = -EINVAL;
1594 break;
1595 }
1596 return ret;
1597}
1598
1599static int xhci_evaluate_context_result(struct xhci_hcd *xhci,
1600 struct usb_device *udev, u32 *cmd_status)
1601{
1602 int ret;
1603 struct xhci_virt_device *virt_dev = xhci->devs[udev->slot_id];
1604
1605 switch (*cmd_status) {
1606 case COMP_EINVAL:
1607 dev_warn(&udev->dev, "WARN: xHCI driver setup invalid evaluate "
1608 "context command.\n");
1609 ret = -EINVAL;
1610 break;
1611 case COMP_EBADSLT:
1612 dev_warn(&udev->dev, "WARN: slot not enabled for"
1613 "evaluate context command.\n");
1614 case COMP_CTX_STATE:
1615 dev_warn(&udev->dev, "WARN: invalid context state for "
1616 "evaluate context command.\n");
1617 xhci_dbg_ctx(xhci, virt_dev->out_ctx, 1);
1618 ret = -EINVAL;
1619 break;
1620 case COMP_DEV_ERR:
1621 dev_warn(&udev->dev, "ERROR: Incompatible device for evaluate "
1622 "context command.\n");
1623 ret = -ENODEV;
1624 break;
1625 case COMP_MEL_ERR:
1626 /* Max Exit Latency too large error */
1627 dev_warn(&udev->dev, "WARN: Max Exit Latency too large\n");
1628 ret = -EINVAL;
1629 break;
1630 case COMP_SUCCESS:
1631 dev_dbg(&udev->dev, "Successful evaluate context command\n");
1632 ret = 0;
1633 break;
1634 default:
1635 xhci_err(xhci, "ERROR: unexpected command completion "
1636 "code 0x%x.\n", *cmd_status);
1637 ret = -EINVAL;
1638 break;
1639 }
1640 return ret;
1641}
1642
1643static u32 xhci_count_num_new_endpoints(struct xhci_hcd *xhci,
1644 struct xhci_container_ctx *in_ctx)
1645{
1646 struct xhci_input_control_ctx *ctrl_ctx;
1647 u32 valid_add_flags;
1648 u32 valid_drop_flags;
1649
1650 ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
1651 /* Ignore the slot flag (bit 0), and the default control endpoint flag
1652 * (bit 1). The default control endpoint is added during the Address
1653 * Device command and is never removed until the slot is disabled.
1654 */
1655 valid_add_flags = ctrl_ctx->add_flags >> 2;
1656 valid_drop_flags = ctrl_ctx->drop_flags >> 2;
1657
1658 /* Use hweight32 to count the number of ones in the add flags, or
1659 * number of endpoints added. Don't count endpoints that are changed
1660 * (both added and dropped).
1661 */
1662 return hweight32(valid_add_flags) -
1663 hweight32(valid_add_flags & valid_drop_flags);
1664}
1665
1666static unsigned int xhci_count_num_dropped_endpoints(struct xhci_hcd *xhci,
1667 struct xhci_container_ctx *in_ctx)
1668{
1669 struct xhci_input_control_ctx *ctrl_ctx;
1670 u32 valid_add_flags;
1671 u32 valid_drop_flags;
1672
1673 ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
1674 valid_add_flags = ctrl_ctx->add_flags >> 2;
1675 valid_drop_flags = ctrl_ctx->drop_flags >> 2;
1676
1677 return hweight32(valid_drop_flags) -
1678 hweight32(valid_add_flags & valid_drop_flags);
1679}
1680
1681/*
1682 * We need to reserve the new number of endpoints before the configure endpoint
1683 * command completes. We can't subtract the dropped endpoints from the number
1684 * of active endpoints until the command completes because we can oversubscribe
1685 * the host in this case:
1686 *
1687 * - the first configure endpoint command drops more endpoints than it adds
1688 * - a second configure endpoint command that adds more endpoints is queued
1689 * - the first configure endpoint command fails, so the config is unchanged
1690 * - the second command may succeed, even though there isn't enough resources
1691 *
1692 * Must be called with xhci->lock held.
1693 */
1694static int xhci_reserve_host_resources(struct xhci_hcd *xhci,
1695 struct xhci_container_ctx *in_ctx)
1696{
1697 u32 added_eps;
1698
1699 added_eps = xhci_count_num_new_endpoints(xhci, in_ctx);
1700 if (xhci->num_active_eps + added_eps > xhci->limit_active_eps) {
1701 xhci_dbg(xhci, "Not enough ep ctxs: "
1702 "%u active, need to add %u, limit is %u.\n",
1703 xhci->num_active_eps, added_eps,
1704 xhci->limit_active_eps);
1705 return -ENOMEM;
1706 }
1707 xhci->num_active_eps += added_eps;
1708 xhci_dbg(xhci, "Adding %u ep ctxs, %u now active.\n", added_eps,
1709 xhci->num_active_eps);
1710 return 0;
1711}
1712
1713/*
1714 * The configure endpoint was failed by the xHC for some other reason, so we
1715 * need to revert the resources that failed configuration would have used.
1716 *
1717 * Must be called with xhci->lock held.
1718 */
1719static void xhci_free_host_resources(struct xhci_hcd *xhci,
1720 struct xhci_container_ctx *in_ctx)
1721{
1722 u32 num_failed_eps;
1723
1724 num_failed_eps = xhci_count_num_new_endpoints(xhci, in_ctx);
1725 xhci->num_active_eps -= num_failed_eps;
1726 xhci_dbg(xhci, "Removing %u failed ep ctxs, %u now active.\n",
1727 num_failed_eps,
1728 xhci->num_active_eps);
1729}
1730
1731/*
1732 * Now that the command has completed, clean up the active endpoint count by
1733 * subtracting out the endpoints that were dropped (but not changed).
1734 *
1735 * Must be called with xhci->lock held.
1736 */
1737static void xhci_finish_resource_reservation(struct xhci_hcd *xhci,
1738 struct xhci_container_ctx *in_ctx)
1739{
1740 u32 num_dropped_eps;
1741
1742 num_dropped_eps = xhci_count_num_dropped_endpoints(xhci, in_ctx);
1743 xhci->num_active_eps -= num_dropped_eps;
1744 if (num_dropped_eps)
1745 xhci_dbg(xhci, "Removing %u dropped ep ctxs, %u now active.\n",
1746 num_dropped_eps,
1747 xhci->num_active_eps);
1748}
1749
1750/* Issue a configure endpoint command or evaluate context command
1751 * and wait for it to finish.
1752 */
1753static int xhci_configure_endpoint(struct xhci_hcd *xhci,
1754 struct usb_device *udev,
1755 struct xhci_command *command,
1756 bool ctx_change, bool must_succeed)
1757{
1758 int ret;
1759 int timeleft;
1760 unsigned long flags;
1761 struct xhci_container_ctx *in_ctx;
1762 struct completion *cmd_completion;
1763 u32 *cmd_status;
1764 struct xhci_virt_device *virt_dev;
1765
1766 spin_lock_irqsave(&xhci->lock, flags);
1767 virt_dev = xhci->devs[udev->slot_id];
1768 if (command) {
1769 in_ctx = command->in_ctx;
1770 if ((xhci->quirks & XHCI_EP_LIMIT_QUIRK) &&
1771 xhci_reserve_host_resources(xhci, in_ctx)) {
1772 spin_unlock_irqrestore(&xhci->lock, flags);
1773 xhci_warn(xhci, "Not enough host resources, "
1774 "active endpoint contexts = %u\n",
1775 xhci->num_active_eps);
1776 return -ENOMEM;
1777 }
1778
1779 cmd_completion = command->completion;
1780 cmd_status = &command->status;
1781 command->command_trb = xhci->cmd_ring->enqueue;
1782
1783 /* Enqueue pointer can be left pointing to the link TRB,
1784 * we must handle that
1785 */
1786 if (TRB_TYPE_LINK_LE32(command->command_trb->link.control))
1787 command->command_trb =
1788 xhci->cmd_ring->enq_seg->next->trbs;
1789
1790 list_add_tail(&command->cmd_list, &virt_dev->cmd_list);
1791 } else {
1792 in_ctx = virt_dev->in_ctx;
1793 if ((xhci->quirks & XHCI_EP_LIMIT_QUIRK) &&
1794 xhci_reserve_host_resources(xhci, in_ctx)) {
1795 spin_unlock_irqrestore(&xhci->lock, flags);
1796 xhci_warn(xhci, "Not enough host resources, "
1797 "active endpoint contexts = %u\n",
1798 xhci->num_active_eps);
1799 return -ENOMEM;
1800 }
1801 cmd_completion = &virt_dev->cmd_completion;
1802 cmd_status = &virt_dev->cmd_status;
1803 }
1804 init_completion(cmd_completion);
1805
1806 if (!ctx_change)
1807 ret = xhci_queue_configure_endpoint(xhci, in_ctx->dma,
1808 udev->slot_id, must_succeed);
1809 else
1810 ret = xhci_queue_evaluate_context(xhci, in_ctx->dma,
1811 udev->slot_id);
1812 if (ret < 0) {
1813 if (command)
1814 list_del(&command->cmd_list);
1815 if ((xhci->quirks & XHCI_EP_LIMIT_QUIRK))
1816 xhci_free_host_resources(xhci, in_ctx);
1817 spin_unlock_irqrestore(&xhci->lock, flags);
1818 xhci_dbg(xhci, "FIXME allocate a new ring segment\n");
1819 return -ENOMEM;
1820 }
1821 xhci_ring_cmd_db(xhci);
1822 spin_unlock_irqrestore(&xhci->lock, flags);
1823
1824 /* Wait for the configure endpoint command to complete */
1825 timeleft = wait_for_completion_interruptible_timeout(
1826 cmd_completion,
1827 USB_CTRL_SET_TIMEOUT);
1828 if (timeleft <= 0) {
1829 xhci_warn(xhci, "%s while waiting for %s command\n",
1830 timeleft == 0 ? "Timeout" : "Signal",
1831 ctx_change == 0 ?
1832 "configure endpoint" :
1833 "evaluate context");
1834 /* FIXME cancel the configure endpoint command */
1835 return -ETIME;
1836 }
1837
1838 if (!ctx_change)
1839 ret = xhci_configure_endpoint_result(xhci, udev, cmd_status);
1840 else
1841 ret = xhci_evaluate_context_result(xhci, udev, cmd_status);
1842
1843 if ((xhci->quirks & XHCI_EP_LIMIT_QUIRK)) {
1844 spin_lock_irqsave(&xhci->lock, flags);
1845 /* If the command failed, remove the reserved resources.
1846 * Otherwise, clean up the estimate to include dropped eps.
1847 */
1848 if (ret)
1849 xhci_free_host_resources(xhci, in_ctx);
1850 else
1851 xhci_finish_resource_reservation(xhci, in_ctx);
1852 spin_unlock_irqrestore(&xhci->lock, flags);
1853 }
1854 return ret;
1855}
1856
1857/* Called after one or more calls to xhci_add_endpoint() or
1858 * xhci_drop_endpoint(). If this call fails, the USB core is expected
1859 * to call xhci_reset_bandwidth().
1860 *
1861 * Since we are in the middle of changing either configuration or
1862 * installing a new alt setting, the USB core won't allow URBs to be
1863 * enqueued for any endpoint on the old config or interface. Nothing
1864 * else should be touching the xhci->devs[slot_id] structure, so we
1865 * don't need to take the xhci->lock for manipulating that.
1866 */
1867int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
1868{
1869 int i;
1870 int ret = 0;
1871 struct xhci_hcd *xhci;
1872 struct xhci_virt_device *virt_dev;
1873 struct xhci_input_control_ctx *ctrl_ctx;
1874 struct xhci_slot_ctx *slot_ctx;
1875
1876 ret = xhci_check_args(hcd, udev, NULL, 0, true, __func__);
1877 if (ret <= 0)
1878 return ret;
1879 xhci = hcd_to_xhci(hcd);
1880 if (xhci->xhc_state & XHCI_STATE_DYING)
1881 return -ENODEV;
1882
1883 xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
1884 virt_dev = xhci->devs[udev->slot_id];
1885
1886 /* See section 4.6.6 - A0 = 1; A1 = D0 = D1 = 0 */
1887 ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
1888 ctrl_ctx->add_flags |= cpu_to_le32(SLOT_FLAG);
1889 ctrl_ctx->add_flags &= cpu_to_le32(~EP0_FLAG);
1890 ctrl_ctx->drop_flags &= cpu_to_le32(~(SLOT_FLAG | EP0_FLAG));
1891 xhci_dbg(xhci, "New Input Control Context:\n");
1892 slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
1893 xhci_dbg_ctx(xhci, virt_dev->in_ctx,
1894 LAST_CTX_TO_EP_NUM(le32_to_cpu(slot_ctx->dev_info)));
1895
1896 ret = xhci_configure_endpoint(xhci, udev, NULL,
1897 false, false);
1898 if (ret) {
1899 /* Callee should call reset_bandwidth() */
1900 return ret;
1901 }
1902
1903 xhci_dbg(xhci, "Output context after successful config ep cmd:\n");
1904 xhci_dbg_ctx(xhci, virt_dev->out_ctx,
1905 LAST_CTX_TO_EP_NUM(le32_to_cpu(slot_ctx->dev_info)));
1906
1907 /* Free any rings that were dropped, but not changed. */
1908 for (i = 1; i < 31; ++i) {
1909 if ((le32_to_cpu(ctrl_ctx->drop_flags) & (1 << (i + 1))) &&
1910 !(le32_to_cpu(ctrl_ctx->add_flags) & (1 << (i + 1))))
1911 xhci_free_or_cache_endpoint_ring(xhci, virt_dev, i);
1912 }
1913 xhci_zero_in_ctx(xhci, virt_dev);
1914 /*
1915 * Install any rings for completely new endpoints or changed endpoints,
1916 * and free or cache any old rings from changed endpoints.
1917 */
1918 for (i = 1; i < 31; ++i) {
1919 if (!virt_dev->eps[i].new_ring)
1920 continue;
1921 /* Only cache or free the old ring if it exists.
1922 * It may not if this is the first add of an endpoint.
1923 */
1924 if (virt_dev->eps[i].ring) {
1925 xhci_free_or_cache_endpoint_ring(xhci, virt_dev, i);
1926 }
1927 virt_dev->eps[i].ring = virt_dev->eps[i].new_ring;
1928 virt_dev->eps[i].new_ring = NULL;
1929 }
1930
1931 return ret;
1932}
1933
1934void xhci_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
1935{
1936 struct xhci_hcd *xhci;
1937 struct xhci_virt_device *virt_dev;
1938 int i, ret;
1939
1940 ret = xhci_check_args(hcd, udev, NULL, 0, true, __func__);
1941 if (ret <= 0)
1942 return;
1943 xhci = hcd_to_xhci(hcd);
1944
1945 xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
1946 virt_dev = xhci->devs[udev->slot_id];
1947 /* Free any rings allocated for added endpoints */
1948 for (i = 0; i < 31; ++i) {
1949 if (virt_dev->eps[i].new_ring) {
1950 xhci_ring_free(xhci, virt_dev->eps[i].new_ring);
1951 virt_dev->eps[i].new_ring = NULL;
1952 }
1953 }
1954 xhci_zero_in_ctx(xhci, virt_dev);
1955}
1956
1957static void xhci_setup_input_ctx_for_config_ep(struct xhci_hcd *xhci,
1958 struct xhci_container_ctx *in_ctx,
1959 struct xhci_container_ctx *out_ctx,
1960 u32 add_flags, u32 drop_flags)
1961{
1962 struct xhci_input_control_ctx *ctrl_ctx;
1963 ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
1964 ctrl_ctx->add_flags = cpu_to_le32(add_flags);
1965 ctrl_ctx->drop_flags = cpu_to_le32(drop_flags);
1966 xhci_slot_copy(xhci, in_ctx, out_ctx);
1967 ctrl_ctx->add_flags |= cpu_to_le32(SLOT_FLAG);
1968
1969 xhci_dbg(xhci, "Input Context:\n");
1970 xhci_dbg_ctx(xhci, in_ctx, xhci_last_valid_endpoint(add_flags));
1971}
1972
1973static void xhci_setup_input_ctx_for_quirk(struct xhci_hcd *xhci,
1974 unsigned int slot_id, unsigned int ep_index,
1975 struct xhci_dequeue_state *deq_state)
1976{
1977 struct xhci_container_ctx *in_ctx;
1978 struct xhci_ep_ctx *ep_ctx;
1979 u32 added_ctxs;
1980 dma_addr_t addr;
1981
1982 xhci_endpoint_copy(xhci, xhci->devs[slot_id]->in_ctx,
1983 xhci->devs[slot_id]->out_ctx, ep_index);
1984 in_ctx = xhci->devs[slot_id]->in_ctx;
1985 ep_ctx = xhci_get_ep_ctx(xhci, in_ctx, ep_index);
1986 addr = xhci_trb_virt_to_dma(deq_state->new_deq_seg,
1987 deq_state->new_deq_ptr);
1988 if (addr == 0) {
1989 xhci_warn(xhci, "WARN Cannot submit config ep after "
1990 "reset ep command\n");
1991 xhci_warn(xhci, "WARN deq seg = %p, deq ptr = %p\n",
1992 deq_state->new_deq_seg,
1993 deq_state->new_deq_ptr);
1994 return;
1995 }
1996 ep_ctx->deq = cpu_to_le64(addr | deq_state->new_cycle_state);
1997
1998 added_ctxs = xhci_get_endpoint_flag_from_index(ep_index);
1999 xhci_setup_input_ctx_for_config_ep(xhci, xhci->devs[slot_id]->in_ctx,
2000 xhci->devs[slot_id]->out_ctx, added_ctxs, added_ctxs);
2001}
2002
2003void xhci_cleanup_stalled_ring(struct xhci_hcd *xhci,
2004 struct usb_device *udev, unsigned int ep_index)
2005{
2006 struct xhci_dequeue_state deq_state;
2007 struct xhci_virt_ep *ep;
2008
2009 xhci_dbg(xhci, "Cleaning up stalled endpoint ring\n");
2010 ep = &xhci->devs[udev->slot_id]->eps[ep_index];
2011 /* We need to move the HW's dequeue pointer past this TD,
2012 * or it will attempt to resend it on the next doorbell ring.
2013 */
2014 xhci_find_new_dequeue_state(xhci, udev->slot_id,
2015 ep_index, ep->stopped_stream, ep->stopped_td,
2016 &deq_state);
2017
2018 /* HW with the reset endpoint quirk will use the saved dequeue state to
2019 * issue a configure endpoint command later.
2020 */
2021 if (!(xhci->quirks & XHCI_RESET_EP_QUIRK)) {
2022 xhci_dbg(xhci, "Queueing new dequeue state\n");
2023 xhci_queue_new_dequeue_state(xhci, udev->slot_id,
2024 ep_index, ep->stopped_stream, &deq_state);
2025 } else {
2026 /* Better hope no one uses the input context between now and the
2027 * reset endpoint completion!
2028 * XXX: No idea how this hardware will react when stream rings
2029 * are enabled.
2030 */
2031 xhci_dbg(xhci, "Setting up input context for "
2032 "configure endpoint command\n");
2033 xhci_setup_input_ctx_for_quirk(xhci, udev->slot_id,
2034 ep_index, &deq_state);
2035 }
2036}
2037
2038/* Deal with stalled endpoints. The core should have sent the control message
2039 * to clear the halt condition. However, we need to make the xHCI hardware
2040 * reset its sequence number, since a device will expect a sequence number of
2041 * zero after the halt condition is cleared.
2042 * Context: in_interrupt
2043 */
2044void xhci_endpoint_reset(struct usb_hcd *hcd,
2045 struct usb_host_endpoint *ep)
2046{
2047 struct xhci_hcd *xhci;
2048 struct usb_device *udev;
2049 unsigned int ep_index;
2050 unsigned long flags;
2051 int ret;
2052 struct xhci_virt_ep *virt_ep;
2053
2054 xhci = hcd_to_xhci(hcd);
2055 udev = (struct usb_device *) ep->hcpriv;
2056 /* Called with a root hub endpoint (or an endpoint that wasn't added
2057 * with xhci_add_endpoint()
2058 */
2059 if (!ep->hcpriv)
2060 return;
2061 ep_index = xhci_get_endpoint_index(&ep->desc);
2062 virt_ep = &xhci->devs[udev->slot_id]->eps[ep_index];
2063 if (!virt_ep->stopped_td) {
2064 xhci_dbg(xhci, "Endpoint 0x%x not halted, refusing to reset.\n",
2065 ep->desc.bEndpointAddress);
2066 return;
2067 }
2068 if (usb_endpoint_xfer_control(&ep->desc)) {
2069 xhci_dbg(xhci, "Control endpoint stall already handled.\n");
2070 return;
2071 }
2072
2073 xhci_dbg(xhci, "Queueing reset endpoint command\n");
2074 spin_lock_irqsave(&xhci->lock, flags);
2075 ret = xhci_queue_reset_ep(xhci, udev->slot_id, ep_index);
2076 /*
2077 * Can't change the ring dequeue pointer until it's transitioned to the
2078 * stopped state, which is only upon a successful reset endpoint
2079 * command. Better hope that last command worked!
2080 */
2081 if (!ret) {
2082 xhci_cleanup_stalled_ring(xhci, udev, ep_index);
2083 kfree(virt_ep->stopped_td);
2084 xhci_ring_cmd_db(xhci);
2085 }
2086 virt_ep->stopped_td = NULL;
2087 virt_ep->stopped_trb = NULL;
2088 virt_ep->stopped_stream = 0;
2089 spin_unlock_irqrestore(&xhci->lock, flags);
2090
2091 if (ret)
2092 xhci_warn(xhci, "FIXME allocate a new ring segment\n");
2093}
2094
2095static int xhci_check_streams_endpoint(struct xhci_hcd *xhci,
2096 struct usb_device *udev, struct usb_host_endpoint *ep,
2097 unsigned int slot_id)
2098{
2099 int ret;
2100 unsigned int ep_index;
2101 unsigned int ep_state;
2102
2103 if (!ep)
2104 return -EINVAL;
2105 ret = xhci_check_args(xhci_to_hcd(xhci), udev, ep, 1, true, __func__);
2106 if (ret <= 0)
2107 return -EINVAL;
2108 if (ep->ss_ep_comp.bmAttributes == 0) {
2109 xhci_warn(xhci, "WARN: SuperSpeed Endpoint Companion"
2110 " descriptor for ep 0x%x does not support streams\n",
2111 ep->desc.bEndpointAddress);
2112 return -EINVAL;
2113 }
2114
2115 ep_index = xhci_get_endpoint_index(&ep->desc);
2116 ep_state = xhci->devs[slot_id]->eps[ep_index].ep_state;
2117 if (ep_state & EP_HAS_STREAMS ||
2118 ep_state & EP_GETTING_STREAMS) {
2119 xhci_warn(xhci, "WARN: SuperSpeed bulk endpoint 0x%x "
2120 "already has streams set up.\n",
2121 ep->desc.bEndpointAddress);
2122 xhci_warn(xhci, "Send email to xHCI maintainer and ask for "
2123 "dynamic stream context array reallocation.\n");
2124 return -EINVAL;
2125 }
2126 if (!list_empty(&xhci->devs[slot_id]->eps[ep_index].ring->td_list)) {
2127 xhci_warn(xhci, "Cannot setup streams for SuperSpeed bulk "
2128 "endpoint 0x%x; URBs are pending.\n",
2129 ep->desc.bEndpointAddress);
2130 return -EINVAL;
2131 }
2132 return 0;
2133}
2134
2135static void xhci_calculate_streams_entries(struct xhci_hcd *xhci,
2136 unsigned int *num_streams, unsigned int *num_stream_ctxs)
2137{
2138 unsigned int max_streams;
2139
2140 /* The stream context array size must be a power of two */
2141 *num_stream_ctxs = roundup_pow_of_two(*num_streams);
2142 /*
2143 * Find out how many primary stream array entries the host controller
2144 * supports. Later we may use secondary stream arrays (similar to 2nd
2145 * level page entries), but that's an optional feature for xHCI host
2146 * controllers. xHCs must support at least 4 stream IDs.
2147 */
2148 max_streams = HCC_MAX_PSA(xhci->hcc_params);
2149 if (*num_stream_ctxs > max_streams) {
2150 xhci_dbg(xhci, "xHCI HW only supports %u stream ctx entries.\n",
2151 max_streams);
2152 *num_stream_ctxs = max_streams;
2153 *num_streams = max_streams;
2154 }
2155}
2156
2157/* Returns an error code if one of the endpoint already has streams.
2158 * This does not change any data structures, it only checks and gathers
2159 * information.
2160 */
2161static int xhci_calculate_streams_and_bitmask(struct xhci_hcd *xhci,
2162 struct usb_device *udev,
2163 struct usb_host_endpoint **eps, unsigned int num_eps,
2164 unsigned int *num_streams, u32 *changed_ep_bitmask)
2165{
2166 unsigned int max_streams;
2167 unsigned int endpoint_flag;
2168 int i;
2169 int ret;
2170
2171 for (i = 0; i < num_eps; i++) {
2172 ret = xhci_check_streams_endpoint(xhci, udev,
2173 eps[i], udev->slot_id);
2174 if (ret < 0)
2175 return ret;
2176
2177 max_streams = USB_SS_MAX_STREAMS(
2178 eps[i]->ss_ep_comp.bmAttributes);
2179 if (max_streams < (*num_streams - 1)) {
2180 xhci_dbg(xhci, "Ep 0x%x only supports %u stream IDs.\n",
2181 eps[i]->desc.bEndpointAddress,
2182 max_streams);
2183 *num_streams = max_streams+1;
2184 }
2185
2186 endpoint_flag = xhci_get_endpoint_flag(&eps[i]->desc);
2187 if (*changed_ep_bitmask & endpoint_flag)
2188 return -EINVAL;
2189 *changed_ep_bitmask |= endpoint_flag;
2190 }
2191 return 0;
2192}
2193
2194static u32 xhci_calculate_no_streams_bitmask(struct xhci_hcd *xhci,
2195 struct usb_device *udev,
2196 struct usb_host_endpoint **eps, unsigned int num_eps)
2197{
2198 u32 changed_ep_bitmask = 0;
2199 unsigned int slot_id;
2200 unsigned int ep_index;
2201 unsigned int ep_state;
2202 int i;
2203
2204 slot_id = udev->slot_id;
2205 if (!xhci->devs[slot_id])
2206 return 0;
2207
2208 for (i = 0; i < num_eps; i++) {
2209 ep_index = xhci_get_endpoint_index(&eps[i]->desc);
2210 ep_state = xhci->devs[slot_id]->eps[ep_index].ep_state;
2211 /* Are streams already being freed for the endpoint? */
2212 if (ep_state & EP_GETTING_NO_STREAMS) {
2213 xhci_warn(xhci, "WARN Can't disable streams for "
2214 "endpoint 0x%x\n, "
2215 "streams are being disabled already.",
2216 eps[i]->desc.bEndpointAddress);
2217 return 0;
2218 }
2219 /* Are there actually any streams to free? */
2220 if (!(ep_state & EP_HAS_STREAMS) &&
2221 !(ep_state & EP_GETTING_STREAMS)) {
2222 xhci_warn(xhci, "WARN Can't disable streams for "
2223 "endpoint 0x%x\n, "
2224 "streams are already disabled!",
2225 eps[i]->desc.bEndpointAddress);
2226 xhci_warn(xhci, "WARN xhci_free_streams() called "
2227 "with non-streams endpoint\n");
2228 return 0;
2229 }
2230 changed_ep_bitmask |= xhci_get_endpoint_flag(&eps[i]->desc);
2231 }
2232 return changed_ep_bitmask;
2233}
2234
2235/*
2236 * The USB device drivers use this function (though the HCD interface in USB
2237 * core) to prepare a set of bulk endpoints to use streams. Streams are used to
2238 * coordinate mass storage command queueing across multiple endpoints (basically
2239 * a stream ID == a task ID).
2240 *
2241 * Setting up streams involves allocating the same size stream context array
2242 * for each endpoint and issuing a configure endpoint command for all endpoints.
2243 *
2244 * Don't allow the call to succeed if one endpoint only supports one stream
2245 * (which means it doesn't support streams at all).
2246 *
2247 * Drivers may get less stream IDs than they asked for, if the host controller
2248 * hardware or endpoints claim they can't support the number of requested
2249 * stream IDs.
2250 */
2251int xhci_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
2252 struct usb_host_endpoint **eps, unsigned int num_eps,
2253 unsigned int num_streams, gfp_t mem_flags)
2254{
2255 int i, ret;
2256 struct xhci_hcd *xhci;
2257 struct xhci_virt_device *vdev;
2258 struct xhci_command *config_cmd;
2259 unsigned int ep_index;
2260 unsigned int num_stream_ctxs;
2261 unsigned long flags;
2262 u32 changed_ep_bitmask = 0;
2263
2264 if (!eps)
2265 return -EINVAL;
2266
2267 /* Add one to the number of streams requested to account for
2268 * stream 0 that is reserved for xHCI usage.
2269 */
2270 num_streams += 1;
2271 xhci = hcd_to_xhci(hcd);
2272 xhci_dbg(xhci, "Driver wants %u stream IDs (including stream 0).\n",
2273 num_streams);
2274
2275 config_cmd = xhci_alloc_command(xhci, true, true, mem_flags);
2276 if (!config_cmd) {
2277 xhci_dbg(xhci, "Could not allocate xHCI command structure.\n");
2278 return -ENOMEM;
2279 }
2280
2281 /* Check to make sure all endpoints are not already configured for
2282 * streams. While we're at it, find the maximum number of streams that
2283 * all the endpoints will support and check for duplicate endpoints.
2284 */
2285 spin_lock_irqsave(&xhci->lock, flags);
2286 ret = xhci_calculate_streams_and_bitmask(xhci, udev, eps,
2287 num_eps, &num_streams, &changed_ep_bitmask);
2288 if (ret < 0) {
2289 xhci_free_command(xhci, config_cmd);
2290 spin_unlock_irqrestore(&xhci->lock, flags);
2291 return ret;
2292 }
2293 if (num_streams <= 1) {
2294 xhci_warn(xhci, "WARN: endpoints can't handle "
2295 "more than one stream.\n");
2296 xhci_free_command(xhci, config_cmd);
2297 spin_unlock_irqrestore(&xhci->lock, flags);
2298 return -EINVAL;
2299 }
2300 vdev = xhci->devs[udev->slot_id];
2301 /* Mark each endpoint as being in transition, so
2302 * xhci_urb_enqueue() will reject all URBs.
2303 */
2304 for (i = 0; i < num_eps; i++) {
2305 ep_index = xhci_get_endpoint_index(&eps[i]->desc);
2306 vdev->eps[ep_index].ep_state |= EP_GETTING_STREAMS;
2307 }
2308 spin_unlock_irqrestore(&xhci->lock, flags);
2309
2310 /* Setup internal data structures and allocate HW data structures for
2311 * streams (but don't install the HW structures in the input context
2312 * until we're sure all memory allocation succeeded).
2313 */
2314 xhci_calculate_streams_entries(xhci, &num_streams, &num_stream_ctxs);
2315 xhci_dbg(xhci, "Need %u stream ctx entries for %u stream IDs.\n",
2316 num_stream_ctxs, num_streams);
2317
2318 for (i = 0; i < num_eps; i++) {
2319 ep_index = xhci_get_endpoint_index(&eps[i]->desc);
2320 vdev->eps[ep_index].stream_info = xhci_alloc_stream_info(xhci,
2321 num_stream_ctxs,
2322 num_streams, mem_flags);
2323 if (!vdev->eps[ep_index].stream_info)
2324 goto cleanup;
2325 /* Set maxPstreams in endpoint context and update deq ptr to
2326 * point to stream context array. FIXME
2327 */
2328 }
2329
2330 /* Set up the input context for a configure endpoint command. */
2331 for (i = 0; i < num_eps; i++) {
2332 struct xhci_ep_ctx *ep_ctx;
2333
2334 ep_index = xhci_get_endpoint_index(&eps[i]->desc);
2335 ep_ctx = xhci_get_ep_ctx(xhci, config_cmd->in_ctx, ep_index);
2336
2337 xhci_endpoint_copy(xhci, config_cmd->in_ctx,
2338 vdev->out_ctx, ep_index);
2339 xhci_setup_streams_ep_input_ctx(xhci, ep_ctx,
2340 vdev->eps[ep_index].stream_info);
2341 }
2342 /* Tell the HW to drop its old copy of the endpoint context info
2343 * and add the updated copy from the input context.
2344 */
2345 xhci_setup_input_ctx_for_config_ep(xhci, config_cmd->in_ctx,
2346 vdev->out_ctx, changed_ep_bitmask, changed_ep_bitmask);
2347
2348 /* Issue and wait for the configure endpoint command */
2349 ret = xhci_configure_endpoint(xhci, udev, config_cmd,
2350 false, false);
2351
2352 /* xHC rejected the configure endpoint command for some reason, so we
2353 * leave the old ring intact and free our internal streams data
2354 * structure.
2355 */
2356 if (ret < 0)
2357 goto cleanup;
2358
2359 spin_lock_irqsave(&xhci->lock, flags);
2360 for (i = 0; i < num_eps; i++) {
2361 ep_index = xhci_get_endpoint_index(&eps[i]->desc);
2362 vdev->eps[ep_index].ep_state &= ~EP_GETTING_STREAMS;
2363 xhci_dbg(xhci, "Slot %u ep ctx %u now has streams.\n",
2364 udev->slot_id, ep_index);
2365 vdev->eps[ep_index].ep_state |= EP_HAS_STREAMS;
2366 }
2367 xhci_free_command(xhci, config_cmd);
2368 spin_unlock_irqrestore(&xhci->lock, flags);
2369
2370 /* Subtract 1 for stream 0, which drivers can't use */
2371 return num_streams - 1;
2372
2373cleanup:
2374 /* If it didn't work, free the streams! */
2375 for (i = 0; i < num_eps; i++) {
2376 ep_index = xhci_get_endpoint_index(&eps[i]->desc);
2377 xhci_free_stream_info(xhci, vdev->eps[ep_index].stream_info);
2378 vdev->eps[ep_index].stream_info = NULL;
2379 /* FIXME Unset maxPstreams in endpoint context and
2380 * update deq ptr to point to normal string ring.
2381 */
2382 vdev->eps[ep_index].ep_state &= ~EP_GETTING_STREAMS;
2383 vdev->eps[ep_index].ep_state &= ~EP_HAS_STREAMS;
2384 xhci_endpoint_zero(xhci, vdev, eps[i]);
2385 }
2386 xhci_free_command(xhci, config_cmd);
2387 return -ENOMEM;
2388}
2389
2390/* Transition the endpoint from using streams to being a "normal" endpoint
2391 * without streams.
2392 *
2393 * Modify the endpoint context state, submit a configure endpoint command,
2394 * and free all endpoint rings for streams if that completes successfully.
2395 */
2396int xhci_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
2397 struct usb_host_endpoint **eps, unsigned int num_eps,
2398 gfp_t mem_flags)
2399{
2400 int i, ret;
2401 struct xhci_hcd *xhci;
2402 struct xhci_virt_device *vdev;
2403 struct xhci_command *command;
2404 unsigned int ep_index;
2405 unsigned long flags;
2406 u32 changed_ep_bitmask;
2407
2408 xhci = hcd_to_xhci(hcd);
2409 vdev = xhci->devs[udev->slot_id];
2410
2411 /* Set up a configure endpoint command to remove the streams rings */
2412 spin_lock_irqsave(&xhci->lock, flags);
2413 changed_ep_bitmask = xhci_calculate_no_streams_bitmask(xhci,
2414 udev, eps, num_eps);
2415 if (changed_ep_bitmask == 0) {
2416 spin_unlock_irqrestore(&xhci->lock, flags);
2417 return -EINVAL;
2418 }
2419
2420 /* Use the xhci_command structure from the first endpoint. We may have
2421 * allocated too many, but the driver may call xhci_free_streams() for
2422 * each endpoint it grouped into one call to xhci_alloc_streams().
2423 */
2424 ep_index = xhci_get_endpoint_index(&eps[0]->desc);
2425 command = vdev->eps[ep_index].stream_info->free_streams_command;
2426 for (i = 0; i < num_eps; i++) {
2427 struct xhci_ep_ctx *ep_ctx;
2428
2429 ep_index = xhci_get_endpoint_index(&eps[i]->desc);
2430 ep_ctx = xhci_get_ep_ctx(xhci, command->in_ctx, ep_index);
2431 xhci->devs[udev->slot_id]->eps[ep_index].ep_state |=
2432 EP_GETTING_NO_STREAMS;
2433
2434 xhci_endpoint_copy(xhci, command->in_ctx,
2435 vdev->out_ctx, ep_index);
2436 xhci_setup_no_streams_ep_input_ctx(xhci, ep_ctx,
2437 &vdev->eps[ep_index]);
2438 }
2439 xhci_setup_input_ctx_for_config_ep(xhci, command->in_ctx,
2440 vdev->out_ctx, changed_ep_bitmask, changed_ep_bitmask);
2441 spin_unlock_irqrestore(&xhci->lock, flags);
2442
2443 /* Issue and wait for the configure endpoint command,
2444 * which must succeed.
2445 */
2446 ret = xhci_configure_endpoint(xhci, udev, command,
2447 false, true);
2448
2449 /* xHC rejected the configure endpoint command for some reason, so we
2450 * leave the streams rings intact.
2451 */
2452 if (ret < 0)
2453 return ret;
2454
2455 spin_lock_irqsave(&xhci->lock, flags);
2456 for (i = 0; i < num_eps; i++) {
2457 ep_index = xhci_get_endpoint_index(&eps[i]->desc);
2458 xhci_free_stream_info(xhci, vdev->eps[ep_index].stream_info);
2459 vdev->eps[ep_index].stream_info = NULL;
2460 /* FIXME Unset maxPstreams in endpoint context and
2461 * update deq ptr to point to normal string ring.
2462 */
2463 vdev->eps[ep_index].ep_state &= ~EP_GETTING_NO_STREAMS;
2464 vdev->eps[ep_index].ep_state &= ~EP_HAS_STREAMS;
2465 }
2466 spin_unlock_irqrestore(&xhci->lock, flags);
2467
2468 return 0;
2469}
2470
2471/*
2472 * Deletes endpoint resources for endpoints that were active before a Reset
2473 * Device command, or a Disable Slot command. The Reset Device command leaves
2474 * the control endpoint intact, whereas the Disable Slot command deletes it.
2475 *
2476 * Must be called with xhci->lock held.
2477 */
2478void xhci_free_device_endpoint_resources(struct xhci_hcd *xhci,
2479 struct xhci_virt_device *virt_dev, bool drop_control_ep)
2480{
2481 int i;
2482 unsigned int num_dropped_eps = 0;
2483 unsigned int drop_flags = 0;
2484
2485 for (i = (drop_control_ep ? 0 : 1); i < 31; i++) {
2486 if (virt_dev->eps[i].ring) {
2487 drop_flags |= 1 << i;
2488 num_dropped_eps++;
2489 }
2490 }
2491 xhci->num_active_eps -= num_dropped_eps;
2492 if (num_dropped_eps)
2493 xhci_dbg(xhci, "Dropped %u ep ctxs, flags = 0x%x, "
2494 "%u now active.\n",
2495 num_dropped_eps, drop_flags,
2496 xhci->num_active_eps);
2497}
2498
2499/*
2500 * This submits a Reset Device Command, which will set the device state to 0,
2501 * set the device address to 0, and disable all the endpoints except the default
2502 * control endpoint. The USB core should come back and call
2503 * xhci_address_device(), and then re-set up the configuration. If this is
2504 * called because of a usb_reset_and_verify_device(), then the old alternate
2505 * settings will be re-installed through the normal bandwidth allocation
2506 * functions.
2507 *
2508 * Wait for the Reset Device command to finish. Remove all structures
2509 * associated with the endpoints that were disabled. Clear the input device
2510 * structure? Cache the rings? Reset the control endpoint 0 max packet size?
2511 *
2512 * If the virt_dev to be reset does not exist or does not match the udev,
2513 * it means the device is lost, possibly due to the xHC restore error and
2514 * re-initialization during S3/S4. In this case, call xhci_alloc_dev() to
2515 * re-allocate the device.
2516 */
2517int xhci_discover_or_reset_device(struct usb_hcd *hcd, struct usb_device *udev)
2518{
2519 int ret, i;
2520 unsigned long flags;
2521 struct xhci_hcd *xhci;
2522 unsigned int slot_id;
2523 struct xhci_virt_device *virt_dev;
2524 struct xhci_command *reset_device_cmd;
2525 int timeleft;
2526 int last_freed_endpoint;
2527 struct xhci_slot_ctx *slot_ctx;
2528
2529 ret = xhci_check_args(hcd, udev, NULL, 0, false, __func__);
2530 if (ret <= 0)
2531 return ret;
2532 xhci = hcd_to_xhci(hcd);
2533 slot_id = udev->slot_id;
2534 virt_dev = xhci->devs[slot_id];
2535 if (!virt_dev) {
2536 xhci_dbg(xhci, "The device to be reset with slot ID %u does "
2537 "not exist. Re-allocate the device\n", slot_id);
2538 ret = xhci_alloc_dev(hcd, udev);
2539 if (ret == 1)
2540 return 0;
2541 else
2542 return -EINVAL;
2543 }
2544
2545 if (virt_dev->udev != udev) {
2546 /* If the virt_dev and the udev does not match, this virt_dev
2547 * may belong to another udev.
2548 * Re-allocate the device.
2549 */
2550 xhci_dbg(xhci, "The device to be reset with slot ID %u does "
2551 "not match the udev. Re-allocate the device\n",
2552 slot_id);
2553 ret = xhci_alloc_dev(hcd, udev);
2554 if (ret == 1)
2555 return 0;
2556 else
2557 return -EINVAL;
2558 }
2559
2560 /* If device is not setup, there is no point in resetting it */
2561 slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->out_ctx);
2562 if (GET_SLOT_STATE(le32_to_cpu(slot_ctx->dev_state)) ==
2563 SLOT_STATE_DISABLED)
2564 return 0;
2565
2566 xhci_dbg(xhci, "Resetting device with slot ID %u\n", slot_id);
2567 /* Allocate the command structure that holds the struct completion.
2568 * Assume we're in process context, since the normal device reset
2569 * process has to wait for the device anyway. Storage devices are
2570 * reset as part of error handling, so use GFP_NOIO instead of
2571 * GFP_KERNEL.
2572 */
2573 reset_device_cmd = xhci_alloc_command(xhci, false, true, GFP_NOIO);
2574 if (!reset_device_cmd) {
2575 xhci_dbg(xhci, "Couldn't allocate command structure.\n");
2576 return -ENOMEM;
2577 }
2578
2579 /* Attempt to submit the Reset Device command to the command ring */
2580 spin_lock_irqsave(&xhci->lock, flags);
2581 reset_device_cmd->command_trb = xhci->cmd_ring->enqueue;
2582
2583 /* Enqueue pointer can be left pointing to the link TRB,
2584 * we must handle that
2585 */
2586 if (TRB_TYPE_LINK_LE32(reset_device_cmd->command_trb->link.control))
2587 reset_device_cmd->command_trb =
2588 xhci->cmd_ring->enq_seg->next->trbs;
2589
2590 list_add_tail(&reset_device_cmd->cmd_list, &virt_dev->cmd_list);
2591 ret = xhci_queue_reset_device(xhci, slot_id);
2592 if (ret) {
2593 xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
2594 list_del(&reset_device_cmd->cmd_list);
2595 spin_unlock_irqrestore(&xhci->lock, flags);
2596 goto command_cleanup;
2597 }
2598 xhci_ring_cmd_db(xhci);
2599 spin_unlock_irqrestore(&xhci->lock, flags);
2600
2601 /* Wait for the Reset Device command to finish */
2602 timeleft = wait_for_completion_interruptible_timeout(
2603 reset_device_cmd->completion,
2604 USB_CTRL_SET_TIMEOUT);
2605 if (timeleft <= 0) {
2606 xhci_warn(xhci, "%s while waiting for reset device command\n",
2607 timeleft == 0 ? "Timeout" : "Signal");
2608 spin_lock_irqsave(&xhci->lock, flags);
2609 /* The timeout might have raced with the event ring handler, so
2610 * only delete from the list if the item isn't poisoned.
2611 */
2612 if (reset_device_cmd->cmd_list.next != LIST_POISON1)
2613 list_del(&reset_device_cmd->cmd_list);
2614 spin_unlock_irqrestore(&xhci->lock, flags);
2615 ret = -ETIME;
2616 goto command_cleanup;
2617 }
2618
2619 /* The Reset Device command can't fail, according to the 0.95/0.96 spec,
2620 * unless we tried to reset a slot ID that wasn't enabled,
2621 * or the device wasn't in the addressed or configured state.
2622 */
2623 ret = reset_device_cmd->status;
2624 switch (ret) {
2625 case COMP_EBADSLT: /* 0.95 completion code for bad slot ID */
2626 case COMP_CTX_STATE: /* 0.96 completion code for same thing */
2627 xhci_info(xhci, "Can't reset device (slot ID %u) in %s state\n",
2628 slot_id,
2629 xhci_get_slot_state(xhci, virt_dev->out_ctx));
2630 xhci_info(xhci, "Not freeing device rings.\n");
2631 /* Don't treat this as an error. May change my mind later. */
2632 ret = 0;
2633 goto command_cleanup;
2634 case COMP_SUCCESS:
2635 xhci_dbg(xhci, "Successful reset device command.\n");
2636 break;
2637 default:
2638 if (xhci_is_vendor_info_code(xhci, ret))
2639 break;
2640 xhci_warn(xhci, "Unknown completion code %u for "
2641 "reset device command.\n", ret);
2642 ret = -EINVAL;
2643 goto command_cleanup;
2644 }
2645
2646 /* Free up host controller endpoint resources */
2647 if ((xhci->quirks & XHCI_EP_LIMIT_QUIRK)) {
2648 spin_lock_irqsave(&xhci->lock, flags);
2649 /* Don't delete the default control endpoint resources */
2650 xhci_free_device_endpoint_resources(xhci, virt_dev, false);
2651 spin_unlock_irqrestore(&xhci->lock, flags);
2652 }
2653
2654 /* Everything but endpoint 0 is disabled, so free or cache the rings. */
2655 last_freed_endpoint = 1;
2656 for (i = 1; i < 31; ++i) {
2657 struct xhci_virt_ep *ep = &virt_dev->eps[i];
2658
2659 if (ep->ep_state & EP_HAS_STREAMS) {
2660 xhci_free_stream_info(xhci, ep->stream_info);
2661 ep->stream_info = NULL;
2662 ep->ep_state &= ~EP_HAS_STREAMS;
2663 }
2664
2665 if (ep->ring) {
2666 xhci_free_or_cache_endpoint_ring(xhci, virt_dev, i);
2667 last_freed_endpoint = i;
2668 }
2669 }
2670 xhci_dbg(xhci, "Output context after successful reset device cmd:\n");
2671 xhci_dbg_ctx(xhci, virt_dev->out_ctx, last_freed_endpoint);
2672 ret = 0;
2673
2674command_cleanup:
2675 xhci_free_command(xhci, reset_device_cmd);
2676 return ret;
2677}
2678
2679/*
2680 * At this point, the struct usb_device is about to go away, the device has
2681 * disconnected, and all traffic has been stopped and the endpoints have been
2682 * disabled. Free any HC data structures associated with that device.
2683 */
2684void xhci_free_dev(struct usb_hcd *hcd, struct usb_device *udev)
2685{
2686 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
2687 struct xhci_virt_device *virt_dev;
2688 unsigned long flags;
2689 u32 state;
2690 int i, ret;
2691
2692 ret = xhci_check_args(hcd, udev, NULL, 0, true, __func__);
2693 /* If the host is halted due to driver unload, we still need to free the
2694 * device.
2695 */
2696 if (ret <= 0 && ret != -ENODEV)
2697 return;
2698
2699 virt_dev = xhci->devs[udev->slot_id];
2700
2701 /* Stop any wayward timer functions (which may grab the lock) */
2702 for (i = 0; i < 31; ++i) {
2703 virt_dev->eps[i].ep_state &= ~EP_HALT_PENDING;
2704 del_timer_sync(&virt_dev->eps[i].stop_cmd_timer);
2705 }
2706
2707 spin_lock_irqsave(&xhci->lock, flags);
2708 /* Don't disable the slot if the host controller is dead. */
2709 state = xhci_readl(xhci, &xhci->op_regs->status);
2710 if (state == 0xffffffff || (xhci->xhc_state & XHCI_STATE_DYING) ||
2711 (xhci->xhc_state & XHCI_STATE_HALTED)) {
2712 xhci_free_virt_device(xhci, udev->slot_id);
2713 spin_unlock_irqrestore(&xhci->lock, flags);
2714 return;
2715 }
2716
2717 if (xhci_queue_slot_control(xhci, TRB_DISABLE_SLOT, udev->slot_id)) {
2718 spin_unlock_irqrestore(&xhci->lock, flags);
2719 xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
2720 return;
2721 }
2722 xhci_ring_cmd_db(xhci);
2723 spin_unlock_irqrestore(&xhci->lock, flags);
2724 /*
2725 * Event command completion handler will free any data structures
2726 * associated with the slot. XXX Can free sleep?
2727 */
2728}
2729
2730/*
2731 * Checks if we have enough host controller resources for the default control
2732 * endpoint.
2733 *
2734 * Must be called with xhci->lock held.
2735 */
2736static int xhci_reserve_host_control_ep_resources(struct xhci_hcd *xhci)
2737{
2738 if (xhci->num_active_eps + 1 > xhci->limit_active_eps) {
2739 xhci_dbg(xhci, "Not enough ep ctxs: "
2740 "%u active, need to add 1, limit is %u.\n",
2741 xhci->num_active_eps, xhci->limit_active_eps);
2742 return -ENOMEM;
2743 }
2744 xhci->num_active_eps += 1;
2745 xhci_dbg(xhci, "Adding 1 ep ctx, %u now active.\n",
2746 xhci->num_active_eps);
2747 return 0;
2748}
2749
2750
2751/*
2752 * Returns 0 if the xHC ran out of device slots, the Enable Slot command
2753 * timed out, or allocating memory failed. Returns 1 on success.
2754 */
2755int xhci_alloc_dev(struct usb_hcd *hcd, struct usb_device *udev)
2756{
2757 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
2758 unsigned long flags;
2759 int timeleft;
2760 int ret;
2761
2762 spin_lock_irqsave(&xhci->lock, flags);
2763 ret = xhci_queue_slot_control(xhci, TRB_ENABLE_SLOT, 0);
2764 if (ret) {
2765 spin_unlock_irqrestore(&xhci->lock, flags);
2766 xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
2767 return 0;
2768 }
2769 xhci_ring_cmd_db(xhci);
2770 spin_unlock_irqrestore(&xhci->lock, flags);
2771
2772 /* XXX: how much time for xHC slot assignment? */
2773 timeleft = wait_for_completion_interruptible_timeout(&xhci->addr_dev,
2774 USB_CTRL_SET_TIMEOUT);
2775 if (timeleft <= 0) {
2776 xhci_warn(xhci, "%s while waiting for a slot\n",
2777 timeleft == 0 ? "Timeout" : "Signal");
2778 /* FIXME cancel the enable slot request */
2779 return 0;
2780 }
2781
2782 if (!xhci->slot_id) {
2783 xhci_err(xhci, "Error while assigning device slot ID\n");
2784 return 0;
2785 }
2786
2787 if ((xhci->quirks & XHCI_EP_LIMIT_QUIRK)) {
2788 spin_lock_irqsave(&xhci->lock, flags);
2789 ret = xhci_reserve_host_control_ep_resources(xhci);
2790 if (ret) {
2791 spin_unlock_irqrestore(&xhci->lock, flags);
2792 xhci_warn(xhci, "Not enough host resources, "
2793 "active endpoint contexts = %u\n",
2794 xhci->num_active_eps);
2795 goto disable_slot;
2796 }
2797 spin_unlock_irqrestore(&xhci->lock, flags);
2798 }
2799 /* Use GFP_NOIO, since this function can be called from
2800 * xhci_discover_or_reset_device(), which may be called as part of
2801 * mass storage driver error handling.
2802 */
2803 if (!xhci_alloc_virt_device(xhci, xhci->slot_id, udev, GFP_NOIO)) {
2804 xhci_warn(xhci, "Could not allocate xHCI USB device data structures\n");
2805 goto disable_slot;
2806 }
2807 udev->slot_id = xhci->slot_id;
2808 /* Is this a LS or FS device under a HS hub? */
2809 /* Hub or peripherial? */
2810 return 1;
2811
2812disable_slot:
2813 /* Disable slot, if we can do it without mem alloc */
2814 spin_lock_irqsave(&xhci->lock, flags);
2815 if (!xhci_queue_slot_control(xhci, TRB_DISABLE_SLOT, udev->slot_id))
2816 xhci_ring_cmd_db(xhci);
2817 spin_unlock_irqrestore(&xhci->lock, flags);
2818 return 0;
2819}
2820
2821/*
2822 * Issue an Address Device command (which will issue a SetAddress request to
2823 * the device).
2824 * We should be protected by the usb_address0_mutex in khubd's hub_port_init, so
2825 * we should only issue and wait on one address command at the same time.
2826 *
2827 * We add one to the device address issued by the hardware because the USB core
2828 * uses address 1 for the root hubs (even though they're not really devices).
2829 */
2830int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev)
2831{
2832 unsigned long flags;
2833 int timeleft;
2834 struct xhci_virt_device *virt_dev;
2835 int ret = 0;
2836 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
2837 struct xhci_slot_ctx *slot_ctx;
2838 struct xhci_input_control_ctx *ctrl_ctx;
2839 u64 temp_64;
2840
2841 if (!udev->slot_id) {
2842 xhci_dbg(xhci, "Bad Slot ID %d\n", udev->slot_id);
2843 return -EINVAL;
2844 }
2845
2846 virt_dev = xhci->devs[udev->slot_id];
2847
2848 if (WARN_ON(!virt_dev)) {
2849 /*
2850 * In plug/unplug torture test with an NEC controller,
2851 * a zero-dereference was observed once due to virt_dev = 0.
2852 * Print useful debug rather than crash if it is observed again!
2853 */
2854 xhci_warn(xhci, "Virt dev invalid for slot_id 0x%x!\n",
2855 udev->slot_id);
2856 return -EINVAL;
2857 }
2858
2859 slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
2860 /*
2861 * If this is the first Set Address since device plug-in or
2862 * virt_device realloaction after a resume with an xHCI power loss,
2863 * then set up the slot context.
2864 */
2865 if (!slot_ctx->dev_info)
2866 xhci_setup_addressable_virt_dev(xhci, udev);
2867 /* Otherwise, update the control endpoint ring enqueue pointer. */
2868 else
2869 xhci_copy_ep0_dequeue_into_input_ctx(xhci, udev);
2870 xhci_dbg(xhci, "Slot ID %d Input Context:\n", udev->slot_id);
2871 xhci_dbg_ctx(xhci, virt_dev->in_ctx, 2);
2872
2873 spin_lock_irqsave(&xhci->lock, flags);
2874 ret = xhci_queue_address_device(xhci, virt_dev->in_ctx->dma,
2875 udev->slot_id);
2876 if (ret) {
2877 spin_unlock_irqrestore(&xhci->lock, flags);
2878 xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
2879 return ret;
2880 }
2881 xhci_ring_cmd_db(xhci);
2882 spin_unlock_irqrestore(&xhci->lock, flags);
2883
2884 /* ctrl tx can take up to 5 sec; XXX: need more time for xHC? */
2885 timeleft = wait_for_completion_interruptible_timeout(&xhci->addr_dev,
2886 USB_CTRL_SET_TIMEOUT);
2887 /* FIXME: From section 4.3.4: "Software shall be responsible for timing
2888 * the SetAddress() "recovery interval" required by USB and aborting the
2889 * command on a timeout.
2890 */
2891 if (timeleft <= 0) {
2892 xhci_warn(xhci, "%s while waiting for a slot\n",
2893 timeleft == 0 ? "Timeout" : "Signal");
2894 /* FIXME cancel the address device command */
2895 return -ETIME;
2896 }
2897
2898 switch (virt_dev->cmd_status) {
2899 case COMP_CTX_STATE:
2900 case COMP_EBADSLT:
2901 xhci_err(xhci, "Setup ERROR: address device command for slot %d.\n",
2902 udev->slot_id);
2903 ret = -EINVAL;
2904 break;
2905 case COMP_TX_ERR:
2906 dev_warn(&udev->dev, "Device not responding to set address.\n");
2907 ret = -EPROTO;
2908 break;
2909 case COMP_DEV_ERR:
2910 dev_warn(&udev->dev, "ERROR: Incompatible device for address "
2911 "device command.\n");
2912 ret = -ENODEV;
2913 break;
2914 case COMP_SUCCESS:
2915 xhci_dbg(xhci, "Successful Address Device command\n");
2916 break;
2917 default:
2918 xhci_err(xhci, "ERROR: unexpected command completion "
2919 "code 0x%x.\n", virt_dev->cmd_status);
2920 xhci_dbg(xhci, "Slot ID %d Output Context:\n", udev->slot_id);
2921 xhci_dbg_ctx(xhci, virt_dev->out_ctx, 2);
2922 ret = -EINVAL;
2923 break;
2924 }
2925 if (ret) {
2926 return ret;
2927 }
2928 temp_64 = xhci_read_64(xhci, &xhci->op_regs->dcbaa_ptr);
2929 xhci_dbg(xhci, "Op regs DCBAA ptr = %#016llx\n", temp_64);
2930 xhci_dbg(xhci, "Slot ID %d dcbaa entry @%p = %#016llx\n",
2931 udev->slot_id,
2932 &xhci->dcbaa->dev_context_ptrs[udev->slot_id],
2933 (unsigned long long)
2934 le64_to_cpu(xhci->dcbaa->dev_context_ptrs[udev->slot_id]));
2935 xhci_dbg(xhci, "Output Context DMA address = %#08llx\n",
2936 (unsigned long long)virt_dev->out_ctx->dma);
2937 xhci_dbg(xhci, "Slot ID %d Input Context:\n", udev->slot_id);
2938 xhci_dbg_ctx(xhci, virt_dev->in_ctx, 2);
2939 xhci_dbg(xhci, "Slot ID %d Output Context:\n", udev->slot_id);
2940 xhci_dbg_ctx(xhci, virt_dev->out_ctx, 2);
2941 /*
2942 * USB core uses address 1 for the roothubs, so we add one to the
2943 * address given back to us by the HC.
2944 */
2945 slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->out_ctx);
2946 /* Use kernel assigned address for devices; store xHC assigned
2947 * address locally. */
2948 virt_dev->address = (le32_to_cpu(slot_ctx->dev_state) & DEV_ADDR_MASK)
2949 + 1;
2950 /* Zero the input context control for later use */
2951 ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
2952 ctrl_ctx->add_flags = 0;
2953 ctrl_ctx->drop_flags = 0;
2954
2955 xhci_dbg(xhci, "Internal device address = %d\n", virt_dev->address);
2956
2957 return 0;
2958}
2959
2960/* Once a hub descriptor is fetched for a device, we need to update the xHC's
2961 * internal data structures for the device.
2962 */
2963int xhci_update_hub_device(struct usb_hcd *hcd, struct usb_device *hdev,
2964 struct usb_tt *tt, gfp_t mem_flags)
2965{
2966 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
2967 struct xhci_virt_device *vdev;
2968 struct xhci_command *config_cmd;
2969 struct xhci_input_control_ctx *ctrl_ctx;
2970 struct xhci_slot_ctx *slot_ctx;
2971 unsigned long flags;
2972 unsigned think_time;
2973 int ret;
2974
2975 /* Ignore root hubs */
2976 if (!hdev->parent)
2977 return 0;
2978
2979 vdev = xhci->devs[hdev->slot_id];
2980 if (!vdev) {
2981 xhci_warn(xhci, "Cannot update hub desc for unknown device.\n");
2982 return -EINVAL;
2983 }
2984 config_cmd = xhci_alloc_command(xhci, true, true, mem_flags);
2985 if (!config_cmd) {
2986 xhci_dbg(xhci, "Could not allocate xHCI command structure.\n");
2987 return -ENOMEM;
2988 }
2989
2990 spin_lock_irqsave(&xhci->lock, flags);
2991 xhci_slot_copy(xhci, config_cmd->in_ctx, vdev->out_ctx);
2992 ctrl_ctx = xhci_get_input_control_ctx(xhci, config_cmd->in_ctx);
2993 ctrl_ctx->add_flags |= cpu_to_le32(SLOT_FLAG);
2994 slot_ctx = xhci_get_slot_ctx(xhci, config_cmd->in_ctx);
2995 slot_ctx->dev_info |= cpu_to_le32(DEV_HUB);
2996 if (tt->multi)
2997 slot_ctx->dev_info |= cpu_to_le32(DEV_MTT);
2998 if (xhci->hci_version > 0x95) {
2999 xhci_dbg(xhci, "xHCI version %x needs hub "
3000 "TT think time and number of ports\n",
3001 (unsigned int) xhci->hci_version);
3002 slot_ctx->dev_info2 |= cpu_to_le32(XHCI_MAX_PORTS(hdev->maxchild));
3003 /* Set TT think time - convert from ns to FS bit times.
3004 * 0 = 8 FS bit times, 1 = 16 FS bit times,
3005 * 2 = 24 FS bit times, 3 = 32 FS bit times.
3006 *
3007 * xHCI 1.0: this field shall be 0 if the device is not a
3008 * High-spped hub.
3009 */
3010 think_time = tt->think_time;
3011 if (think_time != 0)
3012 think_time = (think_time / 666) - 1;
3013 if (xhci->hci_version < 0x100 || hdev->speed == USB_SPEED_HIGH)
3014 slot_ctx->tt_info |=
3015 cpu_to_le32(TT_THINK_TIME(think_time));
3016 } else {
3017 xhci_dbg(xhci, "xHCI version %x doesn't need hub "
3018 "TT think time or number of ports\n",
3019 (unsigned int) xhci->hci_version);
3020 }
3021 slot_ctx->dev_state = 0;
3022 spin_unlock_irqrestore(&xhci->lock, flags);
3023
3024 xhci_dbg(xhci, "Set up %s for hub device.\n",
3025 (xhci->hci_version > 0x95) ?
3026 "configure endpoint" : "evaluate context");
3027 xhci_dbg(xhci, "Slot %u Input Context:\n", hdev->slot_id);
3028 xhci_dbg_ctx(xhci, config_cmd->in_ctx, 0);
3029
3030 /* Issue and wait for the configure endpoint or
3031 * evaluate context command.
3032 */
3033 if (xhci->hci_version > 0x95)
3034 ret = xhci_configure_endpoint(xhci, hdev, config_cmd,
3035 false, false);
3036 else
3037 ret = xhci_configure_endpoint(xhci, hdev, config_cmd,
3038 true, false);
3039
3040 xhci_dbg(xhci, "Slot %u Output Context:\n", hdev->slot_id);
3041 xhci_dbg_ctx(xhci, vdev->out_ctx, 0);
3042
3043 xhci_free_command(xhci, config_cmd);
3044 return ret;
3045}
3046
3047int xhci_get_frame(struct usb_hcd *hcd)
3048{
3049 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
3050 /* EHCI mods by the periodic size. Why? */
3051 return xhci_readl(xhci, &xhci->run_regs->microframe_index) >> 3;
3052}
3053
3054MODULE_DESCRIPTION(DRIVER_DESC);
3055MODULE_AUTHOR(DRIVER_AUTHOR);
3056MODULE_LICENSE("GPL");
3057
3058static int __init xhci_hcd_init(void)
3059{
3060#ifdef CONFIG_PCI
3061 int retval = 0;
3062
3063 retval = xhci_register_pci();
3064
3065 if (retval < 0) {
3066 printk(KERN_DEBUG "Problem registering PCI driver.");
3067 return retval;
3068 }
3069#endif
3070 /*
3071 * Check the compiler generated sizes of structures that must be laid
3072 * out in specific ways for hardware access.
3073 */
3074 BUILD_BUG_ON(sizeof(struct xhci_doorbell_array) != 256*32/8);
3075 BUILD_BUG_ON(sizeof(struct xhci_slot_ctx) != 8*32/8);
3076 BUILD_BUG_ON(sizeof(struct xhci_ep_ctx) != 8*32/8);
3077 /* xhci_device_control has eight fields, and also
3078 * embeds one xhci_slot_ctx and 31 xhci_ep_ctx
3079 */
3080 BUILD_BUG_ON(sizeof(struct xhci_stream_ctx) != 4*32/8);
3081 BUILD_BUG_ON(sizeof(union xhci_trb) != 4*32/8);
3082 BUILD_BUG_ON(sizeof(struct xhci_erst_entry) != 4*32/8);
3083 BUILD_BUG_ON(sizeof(struct xhci_cap_regs) != 7*32/8);
3084 BUILD_BUG_ON(sizeof(struct xhci_intr_reg) != 8*32/8);
3085 /* xhci_run_regs has eight fields and embeds 128 xhci_intr_regs */
3086 BUILD_BUG_ON(sizeof(struct xhci_run_regs) != (8+8*128)*32/8);
3087 BUILD_BUG_ON(sizeof(struct xhci_doorbell_array) != 256*32/8);
3088 return 0;
3089}
3090module_init(xhci_hcd_init);
3091
3092static void __exit xhci_hcd_cleanup(void)
3093{
3094#ifdef CONFIG_PCI
3095 xhci_unregister_pci();
3096#endif
3097}
3098module_exit(xhci_hcd_cleanup);
1/*
2 * xHCI host controller driver
3 *
4 * Copyright (C) 2008 Intel Corp.
5 *
6 * Author: Sarah Sharp
7 * Some code borrowed from the Linux EHCI driver.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 * for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software Foundation,
20 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22
23#include <linux/pci.h>
24#include <linux/irq.h>
25#include <linux/log2.h>
26#include <linux/module.h>
27#include <linux/moduleparam.h>
28#include <linux/slab.h>
29#include <linux/dmi.h>
30
31#include "xhci.h"
32
33#define DRIVER_AUTHOR "Sarah Sharp"
34#define DRIVER_DESC "'eXtensible' Host Controller (xHC) Driver"
35
36/* Some 0.95 hardware can't handle the chain bit on a Link TRB being cleared */
37static int link_quirk;
38module_param(link_quirk, int, S_IRUGO | S_IWUSR);
39MODULE_PARM_DESC(link_quirk, "Don't clear the chain bit on a link TRB");
40
41/* TODO: copied from ehci-hcd.c - can this be refactored? */
42/*
43 * handshake - spin reading hc until handshake completes or fails
44 * @ptr: address of hc register to be read
45 * @mask: bits to look at in result of read
46 * @done: value of those bits when handshake succeeds
47 * @usec: timeout in microseconds
48 *
49 * Returns negative errno, or zero on success
50 *
51 * Success happens when the "mask" bits have the specified value (hardware
52 * handshake done). There are two failure modes: "usec" have passed (major
53 * hardware flakeout), or the register reads as all-ones (hardware removed).
54 */
55int handshake(struct xhci_hcd *xhci, void __iomem *ptr,
56 u32 mask, u32 done, int usec)
57{
58 u32 result;
59
60 do {
61 result = xhci_readl(xhci, ptr);
62 if (result == ~(u32)0) /* card removed */
63 return -ENODEV;
64 result &= mask;
65 if (result == done)
66 return 0;
67 udelay(1);
68 usec--;
69 } while (usec > 0);
70 return -ETIMEDOUT;
71}
72
73/*
74 * Disable interrupts and begin the xHCI halting process.
75 */
76void xhci_quiesce(struct xhci_hcd *xhci)
77{
78 u32 halted;
79 u32 cmd;
80 u32 mask;
81
82 mask = ~(XHCI_IRQS);
83 halted = xhci_readl(xhci, &xhci->op_regs->status) & STS_HALT;
84 if (!halted)
85 mask &= ~CMD_RUN;
86
87 cmd = xhci_readl(xhci, &xhci->op_regs->command);
88 cmd &= mask;
89 xhci_writel(xhci, cmd, &xhci->op_regs->command);
90}
91
92/*
93 * Force HC into halt state.
94 *
95 * Disable any IRQs and clear the run/stop bit.
96 * HC will complete any current and actively pipelined transactions, and
97 * should halt within 16 ms of the run/stop bit being cleared.
98 * Read HC Halted bit in the status register to see when the HC is finished.
99 */
100int xhci_halt(struct xhci_hcd *xhci)
101{
102 int ret;
103 xhci_dbg(xhci, "// Halt the HC\n");
104 xhci_quiesce(xhci);
105
106 ret = handshake(xhci, &xhci->op_regs->status,
107 STS_HALT, STS_HALT, XHCI_MAX_HALT_USEC);
108 if (!ret) {
109 xhci->xhc_state |= XHCI_STATE_HALTED;
110 xhci->cmd_ring_state = CMD_RING_STATE_STOPPED;
111 } else
112 xhci_warn(xhci, "Host not halted after %u microseconds.\n",
113 XHCI_MAX_HALT_USEC);
114 return ret;
115}
116
117/*
118 * Set the run bit and wait for the host to be running.
119 */
120static int xhci_start(struct xhci_hcd *xhci)
121{
122 u32 temp;
123 int ret;
124
125 temp = xhci_readl(xhci, &xhci->op_regs->command);
126 temp |= (CMD_RUN);
127 xhci_dbg(xhci, "// Turn on HC, cmd = 0x%x.\n",
128 temp);
129 xhci_writel(xhci, temp, &xhci->op_regs->command);
130
131 /*
132 * Wait for the HCHalted Status bit to be 0 to indicate the host is
133 * running.
134 */
135 ret = handshake(xhci, &xhci->op_regs->status,
136 STS_HALT, 0, XHCI_MAX_HALT_USEC);
137 if (ret == -ETIMEDOUT)
138 xhci_err(xhci, "Host took too long to start, "
139 "waited %u microseconds.\n",
140 XHCI_MAX_HALT_USEC);
141 if (!ret)
142 xhci->xhc_state &= ~XHCI_STATE_HALTED;
143 return ret;
144}
145
146/*
147 * Reset a halted HC.
148 *
149 * This resets pipelines, timers, counters, state machines, etc.
150 * Transactions will be terminated immediately, and operational registers
151 * will be set to their defaults.
152 */
153int xhci_reset(struct xhci_hcd *xhci)
154{
155 u32 command;
156 u32 state;
157 int ret, i;
158
159 state = xhci_readl(xhci, &xhci->op_regs->status);
160 if ((state & STS_HALT) == 0) {
161 xhci_warn(xhci, "Host controller not halted, aborting reset.\n");
162 return 0;
163 }
164
165 xhci_dbg(xhci, "// Reset the HC\n");
166 command = xhci_readl(xhci, &xhci->op_regs->command);
167 command |= CMD_RESET;
168 xhci_writel(xhci, command, &xhci->op_regs->command);
169
170 ret = handshake(xhci, &xhci->op_regs->command,
171 CMD_RESET, 0, 10 * 1000 * 1000);
172 if (ret)
173 return ret;
174
175 xhci_dbg(xhci, "Wait for controller to be ready for doorbell rings\n");
176 /*
177 * xHCI cannot write to any doorbells or operational registers other
178 * than status until the "Controller Not Ready" flag is cleared.
179 */
180 ret = handshake(xhci, &xhci->op_regs->status,
181 STS_CNR, 0, 10 * 1000 * 1000);
182
183 for (i = 0; i < 2; ++i) {
184 xhci->bus_state[i].port_c_suspend = 0;
185 xhci->bus_state[i].suspended_ports = 0;
186 xhci->bus_state[i].resuming_ports = 0;
187 }
188
189 return ret;
190}
191
192#ifdef CONFIG_PCI
193static int xhci_free_msi(struct xhci_hcd *xhci)
194{
195 int i;
196
197 if (!xhci->msix_entries)
198 return -EINVAL;
199
200 for (i = 0; i < xhci->msix_count; i++)
201 if (xhci->msix_entries[i].vector)
202 free_irq(xhci->msix_entries[i].vector,
203 xhci_to_hcd(xhci));
204 return 0;
205}
206
207/*
208 * Set up MSI
209 */
210static int xhci_setup_msi(struct xhci_hcd *xhci)
211{
212 int ret;
213 struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
214
215 ret = pci_enable_msi(pdev);
216 if (ret) {
217 xhci_dbg(xhci, "failed to allocate MSI entry\n");
218 return ret;
219 }
220
221 ret = request_irq(pdev->irq, (irq_handler_t)xhci_msi_irq,
222 0, "xhci_hcd", xhci_to_hcd(xhci));
223 if (ret) {
224 xhci_dbg(xhci, "disable MSI interrupt\n");
225 pci_disable_msi(pdev);
226 }
227
228 return ret;
229}
230
231/*
232 * Free IRQs
233 * free all IRQs request
234 */
235static void xhci_free_irq(struct xhci_hcd *xhci)
236{
237 struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
238 int ret;
239
240 /* return if using legacy interrupt */
241 if (xhci_to_hcd(xhci)->irq > 0)
242 return;
243
244 ret = xhci_free_msi(xhci);
245 if (!ret)
246 return;
247 if (pdev->irq > 0)
248 free_irq(pdev->irq, xhci_to_hcd(xhci));
249
250 return;
251}
252
253/*
254 * Set up MSI-X
255 */
256static int xhci_setup_msix(struct xhci_hcd *xhci)
257{
258 int i, ret = 0;
259 struct usb_hcd *hcd = xhci_to_hcd(xhci);
260 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
261
262 /*
263 * calculate number of msi-x vectors supported.
264 * - HCS_MAX_INTRS: the max number of interrupts the host can handle,
265 * with max number of interrupters based on the xhci HCSPARAMS1.
266 * - num_online_cpus: maximum msi-x vectors per CPUs core.
267 * Add additional 1 vector to ensure always available interrupt.
268 */
269 xhci->msix_count = min(num_online_cpus() + 1,
270 HCS_MAX_INTRS(xhci->hcs_params1));
271
272 xhci->msix_entries =
273 kmalloc((sizeof(struct msix_entry))*xhci->msix_count,
274 GFP_KERNEL);
275 if (!xhci->msix_entries) {
276 xhci_err(xhci, "Failed to allocate MSI-X entries\n");
277 return -ENOMEM;
278 }
279
280 for (i = 0; i < xhci->msix_count; i++) {
281 xhci->msix_entries[i].entry = i;
282 xhci->msix_entries[i].vector = 0;
283 }
284
285 ret = pci_enable_msix(pdev, xhci->msix_entries, xhci->msix_count);
286 if (ret) {
287 xhci_dbg(xhci, "Failed to enable MSI-X\n");
288 goto free_entries;
289 }
290
291 for (i = 0; i < xhci->msix_count; i++) {
292 ret = request_irq(xhci->msix_entries[i].vector,
293 (irq_handler_t)xhci_msi_irq,
294 0, "xhci_hcd", xhci_to_hcd(xhci));
295 if (ret)
296 goto disable_msix;
297 }
298
299 hcd->msix_enabled = 1;
300 return ret;
301
302disable_msix:
303 xhci_dbg(xhci, "disable MSI-X interrupt\n");
304 xhci_free_irq(xhci);
305 pci_disable_msix(pdev);
306free_entries:
307 kfree(xhci->msix_entries);
308 xhci->msix_entries = NULL;
309 return ret;
310}
311
312/* Free any IRQs and disable MSI-X */
313static void xhci_cleanup_msix(struct xhci_hcd *xhci)
314{
315 struct usb_hcd *hcd = xhci_to_hcd(xhci);
316 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
317
318 xhci_free_irq(xhci);
319
320 if (xhci->msix_entries) {
321 pci_disable_msix(pdev);
322 kfree(xhci->msix_entries);
323 xhci->msix_entries = NULL;
324 } else {
325 pci_disable_msi(pdev);
326 }
327
328 hcd->msix_enabled = 0;
329 return;
330}
331
332static void xhci_msix_sync_irqs(struct xhci_hcd *xhci)
333{
334 int i;
335
336 if (xhci->msix_entries) {
337 for (i = 0; i < xhci->msix_count; i++)
338 synchronize_irq(xhci->msix_entries[i].vector);
339 }
340}
341
342static int xhci_try_enable_msi(struct usb_hcd *hcd)
343{
344 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
345 struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
346 int ret;
347
348 /*
349 * Some Fresco Logic host controllers advertise MSI, but fail to
350 * generate interrupts. Don't even try to enable MSI.
351 */
352 if (xhci->quirks & XHCI_BROKEN_MSI)
353 return 0;
354
355 /* unregister the legacy interrupt */
356 if (hcd->irq)
357 free_irq(hcd->irq, hcd);
358 hcd->irq = 0;
359
360 ret = xhci_setup_msix(xhci);
361 if (ret)
362 /* fall back to msi*/
363 ret = xhci_setup_msi(xhci);
364
365 if (!ret)
366 /* hcd->irq is 0, we have MSI */
367 return 0;
368
369 if (!pdev->irq) {
370 xhci_err(xhci, "No msi-x/msi found and no IRQ in BIOS\n");
371 return -EINVAL;
372 }
373
374 /* fall back to legacy interrupt*/
375 ret = request_irq(pdev->irq, &usb_hcd_irq, IRQF_SHARED,
376 hcd->irq_descr, hcd);
377 if (ret) {
378 xhci_err(xhci, "request interrupt %d failed\n",
379 pdev->irq);
380 return ret;
381 }
382 hcd->irq = pdev->irq;
383 return 0;
384}
385
386#else
387
388static int xhci_try_enable_msi(struct usb_hcd *hcd)
389{
390 return 0;
391}
392
393static void xhci_cleanup_msix(struct xhci_hcd *xhci)
394{
395}
396
397static void xhci_msix_sync_irqs(struct xhci_hcd *xhci)
398{
399}
400
401#endif
402
403static void compliance_mode_recovery(unsigned long arg)
404{
405 struct xhci_hcd *xhci;
406 struct usb_hcd *hcd;
407 u32 temp;
408 int i;
409
410 xhci = (struct xhci_hcd *)arg;
411
412 for (i = 0; i < xhci->num_usb3_ports; i++) {
413 temp = xhci_readl(xhci, xhci->usb3_ports[i]);
414 if ((temp & PORT_PLS_MASK) == USB_SS_PORT_LS_COMP_MOD) {
415 /*
416 * Compliance Mode Detected. Letting USB Core
417 * handle the Warm Reset
418 */
419 xhci_dbg(xhci, "Compliance Mode Detected->Port %d!\n",
420 i + 1);
421 xhci_dbg(xhci, "Attempting Recovery routine!\n");
422 hcd = xhci->shared_hcd;
423
424 if (hcd->state == HC_STATE_SUSPENDED)
425 usb_hcd_resume_root_hub(hcd);
426
427 usb_hcd_poll_rh_status(hcd);
428 }
429 }
430
431 if (xhci->port_status_u0 != ((1 << xhci->num_usb3_ports)-1))
432 mod_timer(&xhci->comp_mode_recovery_timer,
433 jiffies + msecs_to_jiffies(COMP_MODE_RCVRY_MSECS));
434}
435
436/*
437 * Quirk to work around issue generated by the SN65LVPE502CP USB3.0 re-driver
438 * that causes ports behind that hardware to enter compliance mode sometimes.
439 * The quirk creates a timer that polls every 2 seconds the link state of
440 * each host controller's port and recovers it by issuing a Warm reset
441 * if Compliance mode is detected, otherwise the port will become "dead" (no
442 * device connections or disconnections will be detected anymore). Becasue no
443 * status event is generated when entering compliance mode (per xhci spec),
444 * this quirk is needed on systems that have the failing hardware installed.
445 */
446static void compliance_mode_recovery_timer_init(struct xhci_hcd *xhci)
447{
448 xhci->port_status_u0 = 0;
449 init_timer(&xhci->comp_mode_recovery_timer);
450
451 xhci->comp_mode_recovery_timer.data = (unsigned long) xhci;
452 xhci->comp_mode_recovery_timer.function = compliance_mode_recovery;
453 xhci->comp_mode_recovery_timer.expires = jiffies +
454 msecs_to_jiffies(COMP_MODE_RCVRY_MSECS);
455
456 set_timer_slack(&xhci->comp_mode_recovery_timer,
457 msecs_to_jiffies(COMP_MODE_RCVRY_MSECS));
458 add_timer(&xhci->comp_mode_recovery_timer);
459 xhci_dbg(xhci, "Compliance Mode Recovery Timer Initialized.\n");
460}
461
462/*
463 * This function identifies the systems that have installed the SN65LVPE502CP
464 * USB3.0 re-driver and that need the Compliance Mode Quirk.
465 * Systems:
466 * Vendor: Hewlett-Packard -> System Models: Z420, Z620 and Z820
467 */
468static bool compliance_mode_recovery_timer_quirk_check(void)
469{
470 const char *dmi_product_name, *dmi_sys_vendor;
471
472 dmi_product_name = dmi_get_system_info(DMI_PRODUCT_NAME);
473 dmi_sys_vendor = dmi_get_system_info(DMI_SYS_VENDOR);
474 if (!dmi_product_name || !dmi_sys_vendor)
475 return false;
476
477 if (!(strstr(dmi_sys_vendor, "Hewlett-Packard")))
478 return false;
479
480 if (strstr(dmi_product_name, "Z420") ||
481 strstr(dmi_product_name, "Z620") ||
482 strstr(dmi_product_name, "Z820"))
483 return true;
484
485 return false;
486}
487
488static int xhci_all_ports_seen_u0(struct xhci_hcd *xhci)
489{
490 return (xhci->port_status_u0 == ((1 << xhci->num_usb3_ports)-1));
491}
492
493
494/*
495 * Initialize memory for HCD and xHC (one-time init).
496 *
497 * Program the PAGESIZE register, initialize the device context array, create
498 * device contexts (?), set up a command ring segment (or two?), create event
499 * ring (one for now).
500 */
501int xhci_init(struct usb_hcd *hcd)
502{
503 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
504 int retval = 0;
505
506 xhci_dbg(xhci, "xhci_init\n");
507 spin_lock_init(&xhci->lock);
508 if (xhci->hci_version == 0x95 && link_quirk) {
509 xhci_dbg(xhci, "QUIRK: Not clearing Link TRB chain bits.\n");
510 xhci->quirks |= XHCI_LINK_TRB_QUIRK;
511 } else {
512 xhci_dbg(xhci, "xHCI doesn't need link TRB QUIRK\n");
513 }
514 retval = xhci_mem_init(xhci, GFP_KERNEL);
515 xhci_dbg(xhci, "Finished xhci_init\n");
516
517 /* Initializing Compliance Mode Recovery Data If Needed */
518 if (compliance_mode_recovery_timer_quirk_check()) {
519 xhci->quirks |= XHCI_COMP_MODE_QUIRK;
520 compliance_mode_recovery_timer_init(xhci);
521 }
522
523 return retval;
524}
525
526/*-------------------------------------------------------------------------*/
527
528
529#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
530static void xhci_event_ring_work(unsigned long arg)
531{
532 unsigned long flags;
533 int temp;
534 u64 temp_64;
535 struct xhci_hcd *xhci = (struct xhci_hcd *) arg;
536 int i, j;
537
538 xhci_dbg(xhci, "Poll event ring: %lu\n", jiffies);
539
540 spin_lock_irqsave(&xhci->lock, flags);
541 temp = xhci_readl(xhci, &xhci->op_regs->status);
542 xhci_dbg(xhci, "op reg status = 0x%x\n", temp);
543 if (temp == 0xffffffff || (xhci->xhc_state & XHCI_STATE_DYING) ||
544 (xhci->xhc_state & XHCI_STATE_HALTED)) {
545 xhci_dbg(xhci, "HW died, polling stopped.\n");
546 spin_unlock_irqrestore(&xhci->lock, flags);
547 return;
548 }
549
550 temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
551 xhci_dbg(xhci, "ir_set 0 pending = 0x%x\n", temp);
552 xhci_dbg(xhci, "HC error bitmask = 0x%x\n", xhci->error_bitmask);
553 xhci->error_bitmask = 0;
554 xhci_dbg(xhci, "Event ring:\n");
555 xhci_debug_segment(xhci, xhci->event_ring->deq_seg);
556 xhci_dbg_ring_ptrs(xhci, xhci->event_ring);
557 temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
558 temp_64 &= ~ERST_PTR_MASK;
559 xhci_dbg(xhci, "ERST deq = 64'h%0lx\n", (long unsigned int) temp_64);
560 xhci_dbg(xhci, "Command ring:\n");
561 xhci_debug_segment(xhci, xhci->cmd_ring->deq_seg);
562 xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring);
563 xhci_dbg_cmd_ptrs(xhci);
564 for (i = 0; i < MAX_HC_SLOTS; ++i) {
565 if (!xhci->devs[i])
566 continue;
567 for (j = 0; j < 31; ++j) {
568 xhci_dbg_ep_rings(xhci, i, j, &xhci->devs[i]->eps[j]);
569 }
570 }
571 spin_unlock_irqrestore(&xhci->lock, flags);
572
573 if (!xhci->zombie)
574 mod_timer(&xhci->event_ring_timer, jiffies + POLL_TIMEOUT * HZ);
575 else
576 xhci_dbg(xhci, "Quit polling the event ring.\n");
577}
578#endif
579
580static int xhci_run_finished(struct xhci_hcd *xhci)
581{
582 if (xhci_start(xhci)) {
583 xhci_halt(xhci);
584 return -ENODEV;
585 }
586 xhci->shared_hcd->state = HC_STATE_RUNNING;
587 xhci->cmd_ring_state = CMD_RING_STATE_RUNNING;
588
589 if (xhci->quirks & XHCI_NEC_HOST)
590 xhci_ring_cmd_db(xhci);
591
592 xhci_dbg(xhci, "Finished xhci_run for USB3 roothub\n");
593 return 0;
594}
595
596/*
597 * Start the HC after it was halted.
598 *
599 * This function is called by the USB core when the HC driver is added.
600 * Its opposite is xhci_stop().
601 *
602 * xhci_init() must be called once before this function can be called.
603 * Reset the HC, enable device slot contexts, program DCBAAP, and
604 * set command ring pointer and event ring pointer.
605 *
606 * Setup MSI-X vectors and enable interrupts.
607 */
608int xhci_run(struct usb_hcd *hcd)
609{
610 u32 temp;
611 u64 temp_64;
612 int ret;
613 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
614
615 /* Start the xHCI host controller running only after the USB 2.0 roothub
616 * is setup.
617 */
618
619 hcd->uses_new_polling = 1;
620 if (!usb_hcd_is_primary_hcd(hcd))
621 return xhci_run_finished(xhci);
622
623 xhci_dbg(xhci, "xhci_run\n");
624
625 ret = xhci_try_enable_msi(hcd);
626 if (ret)
627 return ret;
628
629#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
630 init_timer(&xhci->event_ring_timer);
631 xhci->event_ring_timer.data = (unsigned long) xhci;
632 xhci->event_ring_timer.function = xhci_event_ring_work;
633 /* Poll the event ring */
634 xhci->event_ring_timer.expires = jiffies + POLL_TIMEOUT * HZ;
635 xhci->zombie = 0;
636 xhci_dbg(xhci, "Setting event ring polling timer\n");
637 add_timer(&xhci->event_ring_timer);
638#endif
639
640 xhci_dbg(xhci, "Command ring memory map follows:\n");
641 xhci_debug_ring(xhci, xhci->cmd_ring);
642 xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring);
643 xhci_dbg_cmd_ptrs(xhci);
644
645 xhci_dbg(xhci, "ERST memory map follows:\n");
646 xhci_dbg_erst(xhci, &xhci->erst);
647 xhci_dbg(xhci, "Event ring:\n");
648 xhci_debug_ring(xhci, xhci->event_ring);
649 xhci_dbg_ring_ptrs(xhci, xhci->event_ring);
650 temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
651 temp_64 &= ~ERST_PTR_MASK;
652 xhci_dbg(xhci, "ERST deq = 64'h%0lx\n", (long unsigned int) temp_64);
653
654 xhci_dbg(xhci, "// Set the interrupt modulation register\n");
655 temp = xhci_readl(xhci, &xhci->ir_set->irq_control);
656 temp &= ~ER_IRQ_INTERVAL_MASK;
657 temp |= (u32) 160;
658 xhci_writel(xhci, temp, &xhci->ir_set->irq_control);
659
660 /* Set the HCD state before we enable the irqs */
661 temp = xhci_readl(xhci, &xhci->op_regs->command);
662 temp |= (CMD_EIE);
663 xhci_dbg(xhci, "// Enable interrupts, cmd = 0x%x.\n",
664 temp);
665 xhci_writel(xhci, temp, &xhci->op_regs->command);
666
667 temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
668 xhci_dbg(xhci, "// Enabling event ring interrupter %p by writing 0x%x to irq_pending\n",
669 xhci->ir_set, (unsigned int) ER_IRQ_ENABLE(temp));
670 xhci_writel(xhci, ER_IRQ_ENABLE(temp),
671 &xhci->ir_set->irq_pending);
672 xhci_print_ir_set(xhci, 0);
673
674 if (xhci->quirks & XHCI_NEC_HOST)
675 xhci_queue_vendor_command(xhci, 0, 0, 0,
676 TRB_TYPE(TRB_NEC_GET_FW));
677
678 xhci_dbg(xhci, "Finished xhci_run for USB2 roothub\n");
679 return 0;
680}
681
682static void xhci_only_stop_hcd(struct usb_hcd *hcd)
683{
684 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
685
686 spin_lock_irq(&xhci->lock);
687 xhci_halt(xhci);
688
689 /* The shared_hcd is going to be deallocated shortly (the USB core only
690 * calls this function when allocation fails in usb_add_hcd(), or
691 * usb_remove_hcd() is called). So we need to unset xHCI's pointer.
692 */
693 xhci->shared_hcd = NULL;
694 spin_unlock_irq(&xhci->lock);
695}
696
697/*
698 * Stop xHCI driver.
699 *
700 * This function is called by the USB core when the HC driver is removed.
701 * Its opposite is xhci_run().
702 *
703 * Disable device contexts, disable IRQs, and quiesce the HC.
704 * Reset the HC, finish any completed transactions, and cleanup memory.
705 */
706void xhci_stop(struct usb_hcd *hcd)
707{
708 u32 temp;
709 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
710
711 if (!usb_hcd_is_primary_hcd(hcd)) {
712 xhci_only_stop_hcd(xhci->shared_hcd);
713 return;
714 }
715
716 spin_lock_irq(&xhci->lock);
717 /* Make sure the xHC is halted for a USB3 roothub
718 * (xhci_stop() could be called as part of failed init).
719 */
720 xhci_halt(xhci);
721 xhci_reset(xhci);
722 spin_unlock_irq(&xhci->lock);
723
724 xhci_cleanup_msix(xhci);
725
726#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
727 /* Tell the event ring poll function not to reschedule */
728 xhci->zombie = 1;
729 del_timer_sync(&xhci->event_ring_timer);
730#endif
731
732 /* Deleting Compliance Mode Recovery Timer */
733 if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) &&
734 (!(xhci_all_ports_seen_u0(xhci))))
735 del_timer_sync(&xhci->comp_mode_recovery_timer);
736
737 if (xhci->quirks & XHCI_AMD_PLL_FIX)
738 usb_amd_dev_put();
739
740 xhci_dbg(xhci, "// Disabling event ring interrupts\n");
741 temp = xhci_readl(xhci, &xhci->op_regs->status);
742 xhci_writel(xhci, temp & ~STS_EINT, &xhci->op_regs->status);
743 temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
744 xhci_writel(xhci, ER_IRQ_DISABLE(temp),
745 &xhci->ir_set->irq_pending);
746 xhci_print_ir_set(xhci, 0);
747
748 xhci_dbg(xhci, "cleaning up memory\n");
749 xhci_mem_cleanup(xhci);
750 xhci_dbg(xhci, "xhci_stop completed - status = %x\n",
751 xhci_readl(xhci, &xhci->op_regs->status));
752}
753
754/*
755 * Shutdown HC (not bus-specific)
756 *
757 * This is called when the machine is rebooting or halting. We assume that the
758 * machine will be powered off, and the HC's internal state will be reset.
759 * Don't bother to free memory.
760 *
761 * This will only ever be called with the main usb_hcd (the USB3 roothub).
762 */
763void xhci_shutdown(struct usb_hcd *hcd)
764{
765 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
766
767 if (xhci->quirks & XHCI_SPURIOUS_REBOOT)
768 usb_disable_xhci_ports(to_pci_dev(hcd->self.controller));
769
770 spin_lock_irq(&xhci->lock);
771 xhci_halt(xhci);
772 spin_unlock_irq(&xhci->lock);
773
774 xhci_cleanup_msix(xhci);
775
776 xhci_dbg(xhci, "xhci_shutdown completed - status = %x\n",
777 xhci_readl(xhci, &xhci->op_regs->status));
778}
779
780#ifdef CONFIG_PM
781static void xhci_save_registers(struct xhci_hcd *xhci)
782{
783 xhci->s3.command = xhci_readl(xhci, &xhci->op_regs->command);
784 xhci->s3.dev_nt = xhci_readl(xhci, &xhci->op_regs->dev_notification);
785 xhci->s3.dcbaa_ptr = xhci_read_64(xhci, &xhci->op_regs->dcbaa_ptr);
786 xhci->s3.config_reg = xhci_readl(xhci, &xhci->op_regs->config_reg);
787 xhci->s3.erst_size = xhci_readl(xhci, &xhci->ir_set->erst_size);
788 xhci->s3.erst_base = xhci_read_64(xhci, &xhci->ir_set->erst_base);
789 xhci->s3.erst_dequeue = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
790 xhci->s3.irq_pending = xhci_readl(xhci, &xhci->ir_set->irq_pending);
791 xhci->s3.irq_control = xhci_readl(xhci, &xhci->ir_set->irq_control);
792}
793
794static void xhci_restore_registers(struct xhci_hcd *xhci)
795{
796 xhci_writel(xhci, xhci->s3.command, &xhci->op_regs->command);
797 xhci_writel(xhci, xhci->s3.dev_nt, &xhci->op_regs->dev_notification);
798 xhci_write_64(xhci, xhci->s3.dcbaa_ptr, &xhci->op_regs->dcbaa_ptr);
799 xhci_writel(xhci, xhci->s3.config_reg, &xhci->op_regs->config_reg);
800 xhci_writel(xhci, xhci->s3.erst_size, &xhci->ir_set->erst_size);
801 xhci_write_64(xhci, xhci->s3.erst_base, &xhci->ir_set->erst_base);
802 xhci_write_64(xhci, xhci->s3.erst_dequeue, &xhci->ir_set->erst_dequeue);
803 xhci_writel(xhci, xhci->s3.irq_pending, &xhci->ir_set->irq_pending);
804 xhci_writel(xhci, xhci->s3.irq_control, &xhci->ir_set->irq_control);
805}
806
807static void xhci_set_cmd_ring_deq(struct xhci_hcd *xhci)
808{
809 u64 val_64;
810
811 /* step 2: initialize command ring buffer */
812 val_64 = xhci_read_64(xhci, &xhci->op_regs->cmd_ring);
813 val_64 = (val_64 & (u64) CMD_RING_RSVD_BITS) |
814 (xhci_trb_virt_to_dma(xhci->cmd_ring->deq_seg,
815 xhci->cmd_ring->dequeue) &
816 (u64) ~CMD_RING_RSVD_BITS) |
817 xhci->cmd_ring->cycle_state;
818 xhci_dbg(xhci, "// Setting command ring address to 0x%llx\n",
819 (long unsigned long) val_64);
820 xhci_write_64(xhci, val_64, &xhci->op_regs->cmd_ring);
821}
822
823/*
824 * The whole command ring must be cleared to zero when we suspend the host.
825 *
826 * The host doesn't save the command ring pointer in the suspend well, so we
827 * need to re-program it on resume. Unfortunately, the pointer must be 64-byte
828 * aligned, because of the reserved bits in the command ring dequeue pointer
829 * register. Therefore, we can't just set the dequeue pointer back in the
830 * middle of the ring (TRBs are 16-byte aligned).
831 */
832static void xhci_clear_command_ring(struct xhci_hcd *xhci)
833{
834 struct xhci_ring *ring;
835 struct xhci_segment *seg;
836
837 ring = xhci->cmd_ring;
838 seg = ring->deq_seg;
839 do {
840 memset(seg->trbs, 0,
841 sizeof(union xhci_trb) * (TRBS_PER_SEGMENT - 1));
842 seg->trbs[TRBS_PER_SEGMENT - 1].link.control &=
843 cpu_to_le32(~TRB_CYCLE);
844 seg = seg->next;
845 } while (seg != ring->deq_seg);
846
847 /* Reset the software enqueue and dequeue pointers */
848 ring->deq_seg = ring->first_seg;
849 ring->dequeue = ring->first_seg->trbs;
850 ring->enq_seg = ring->deq_seg;
851 ring->enqueue = ring->dequeue;
852
853 ring->num_trbs_free = ring->num_segs * (TRBS_PER_SEGMENT - 1) - 1;
854 /*
855 * Ring is now zeroed, so the HW should look for change of ownership
856 * when the cycle bit is set to 1.
857 */
858 ring->cycle_state = 1;
859
860 /*
861 * Reset the hardware dequeue pointer.
862 * Yes, this will need to be re-written after resume, but we're paranoid
863 * and want to make sure the hardware doesn't access bogus memory
864 * because, say, the BIOS or an SMI started the host without changing
865 * the command ring pointers.
866 */
867 xhci_set_cmd_ring_deq(xhci);
868}
869
870/*
871 * Stop HC (not bus-specific)
872 *
873 * This is called when the machine transition into S3/S4 mode.
874 *
875 */
876int xhci_suspend(struct xhci_hcd *xhci)
877{
878 int rc = 0;
879 struct usb_hcd *hcd = xhci_to_hcd(xhci);
880 u32 command;
881
882 spin_lock_irq(&xhci->lock);
883 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
884 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags);
885 /* step 1: stop endpoint */
886 /* skipped assuming that port suspend has done */
887
888 /* step 2: clear Run/Stop bit */
889 command = xhci_readl(xhci, &xhci->op_regs->command);
890 command &= ~CMD_RUN;
891 xhci_writel(xhci, command, &xhci->op_regs->command);
892 if (handshake(xhci, &xhci->op_regs->status,
893 STS_HALT, STS_HALT, XHCI_MAX_HALT_USEC)) {
894 xhci_warn(xhci, "WARN: xHC CMD_RUN timeout\n");
895 spin_unlock_irq(&xhci->lock);
896 return -ETIMEDOUT;
897 }
898 xhci_clear_command_ring(xhci);
899
900 /* step 3: save registers */
901 xhci_save_registers(xhci);
902
903 /* step 4: set CSS flag */
904 command = xhci_readl(xhci, &xhci->op_regs->command);
905 command |= CMD_CSS;
906 xhci_writel(xhci, command, &xhci->op_regs->command);
907 if (handshake(xhci, &xhci->op_regs->status, STS_SAVE, 0, 10 * 1000)) {
908 xhci_warn(xhci, "WARN: xHC save state timeout\n");
909 spin_unlock_irq(&xhci->lock);
910 return -ETIMEDOUT;
911 }
912 spin_unlock_irq(&xhci->lock);
913
914 /*
915 * Deleting Compliance Mode Recovery Timer because the xHCI Host
916 * is about to be suspended.
917 */
918 if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) &&
919 (!(xhci_all_ports_seen_u0(xhci)))) {
920 del_timer_sync(&xhci->comp_mode_recovery_timer);
921 xhci_dbg(xhci, "Compliance Mode Recovery Timer Deleted!\n");
922 }
923
924 /* step 5: remove core well power */
925 /* synchronize irq when using MSI-X */
926 xhci_msix_sync_irqs(xhci);
927
928 return rc;
929}
930
931/*
932 * start xHC (not bus-specific)
933 *
934 * This is called when the machine transition from S3/S4 mode.
935 *
936 */
937int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
938{
939 u32 command, temp = 0;
940 struct usb_hcd *hcd = xhci_to_hcd(xhci);
941 struct usb_hcd *secondary_hcd;
942 int retval = 0;
943
944 /* Wait a bit if either of the roothubs need to settle from the
945 * transition into bus suspend.
946 */
947 if (time_before(jiffies, xhci->bus_state[0].next_statechange) ||
948 time_before(jiffies,
949 xhci->bus_state[1].next_statechange))
950 msleep(100);
951
952 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
953 set_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags);
954
955 spin_lock_irq(&xhci->lock);
956 if (xhci->quirks & XHCI_RESET_ON_RESUME)
957 hibernated = true;
958
959 if (!hibernated) {
960 /* step 1: restore register */
961 xhci_restore_registers(xhci);
962 /* step 2: initialize command ring buffer */
963 xhci_set_cmd_ring_deq(xhci);
964 /* step 3: restore state and start state*/
965 /* step 3: set CRS flag */
966 command = xhci_readl(xhci, &xhci->op_regs->command);
967 command |= CMD_CRS;
968 xhci_writel(xhci, command, &xhci->op_regs->command);
969 if (handshake(xhci, &xhci->op_regs->status,
970 STS_RESTORE, 0, 10 * 1000)) {
971 xhci_warn(xhci, "WARN: xHC restore state timeout\n");
972 spin_unlock_irq(&xhci->lock);
973 return -ETIMEDOUT;
974 }
975 temp = xhci_readl(xhci, &xhci->op_regs->status);
976 }
977
978 /* If restore operation fails, re-initialize the HC during resume */
979 if ((temp & STS_SRE) || hibernated) {
980 /* Let the USB core know _both_ roothubs lost power. */
981 usb_root_hub_lost_power(xhci->main_hcd->self.root_hub);
982 usb_root_hub_lost_power(xhci->shared_hcd->self.root_hub);
983
984 xhci_dbg(xhci, "Stop HCD\n");
985 xhci_halt(xhci);
986 xhci_reset(xhci);
987 spin_unlock_irq(&xhci->lock);
988 xhci_cleanup_msix(xhci);
989
990#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
991 /* Tell the event ring poll function not to reschedule */
992 xhci->zombie = 1;
993 del_timer_sync(&xhci->event_ring_timer);
994#endif
995
996 xhci_dbg(xhci, "// Disabling event ring interrupts\n");
997 temp = xhci_readl(xhci, &xhci->op_regs->status);
998 xhci_writel(xhci, temp & ~STS_EINT, &xhci->op_regs->status);
999 temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
1000 xhci_writel(xhci, ER_IRQ_DISABLE(temp),
1001 &xhci->ir_set->irq_pending);
1002 xhci_print_ir_set(xhci, 0);
1003
1004 xhci_dbg(xhci, "cleaning up memory\n");
1005 xhci_mem_cleanup(xhci);
1006 xhci_dbg(xhci, "xhci_stop completed - status = %x\n",
1007 xhci_readl(xhci, &xhci->op_regs->status));
1008
1009 /* USB core calls the PCI reinit and start functions twice:
1010 * first with the primary HCD, and then with the secondary HCD.
1011 * If we don't do the same, the host will never be started.
1012 */
1013 if (!usb_hcd_is_primary_hcd(hcd))
1014 secondary_hcd = hcd;
1015 else
1016 secondary_hcd = xhci->shared_hcd;
1017
1018 xhci_dbg(xhci, "Initialize the xhci_hcd\n");
1019 retval = xhci_init(hcd->primary_hcd);
1020 if (retval)
1021 return retval;
1022 xhci_dbg(xhci, "Start the primary HCD\n");
1023 retval = xhci_run(hcd->primary_hcd);
1024 if (!retval) {
1025 xhci_dbg(xhci, "Start the secondary HCD\n");
1026 retval = xhci_run(secondary_hcd);
1027 }
1028 hcd->state = HC_STATE_SUSPENDED;
1029 xhci->shared_hcd->state = HC_STATE_SUSPENDED;
1030 goto done;
1031 }
1032
1033 /* step 4: set Run/Stop bit */
1034 command = xhci_readl(xhci, &xhci->op_regs->command);
1035 command |= CMD_RUN;
1036 xhci_writel(xhci, command, &xhci->op_regs->command);
1037 handshake(xhci, &xhci->op_regs->status, STS_HALT,
1038 0, 250 * 1000);
1039
1040 /* step 5: walk topology and initialize portsc,
1041 * portpmsc and portli
1042 */
1043 /* this is done in bus_resume */
1044
1045 /* step 6: restart each of the previously
1046 * Running endpoints by ringing their doorbells
1047 */
1048
1049 spin_unlock_irq(&xhci->lock);
1050
1051 done:
1052 if (retval == 0) {
1053 usb_hcd_resume_root_hub(hcd);
1054 usb_hcd_resume_root_hub(xhci->shared_hcd);
1055 }
1056
1057 /*
1058 * If system is subject to the Quirk, Compliance Mode Timer needs to
1059 * be re-initialized Always after a system resume. Ports are subject
1060 * to suffer the Compliance Mode issue again. It doesn't matter if
1061 * ports have entered previously to U0 before system's suspension.
1062 */
1063 if (xhci->quirks & XHCI_COMP_MODE_QUIRK)
1064 compliance_mode_recovery_timer_init(xhci);
1065
1066 return retval;
1067}
1068#endif /* CONFIG_PM */
1069
1070/*-------------------------------------------------------------------------*/
1071
1072/**
1073 * xhci_get_endpoint_index - Used for passing endpoint bitmasks between the core and
1074 * HCDs. Find the index for an endpoint given its descriptor. Use the return
1075 * value to right shift 1 for the bitmask.
1076 *
1077 * Index = (epnum * 2) + direction - 1,
1078 * where direction = 0 for OUT, 1 for IN.
1079 * For control endpoints, the IN index is used (OUT index is unused), so
1080 * index = (epnum * 2) + direction - 1 = (epnum * 2) + 1 - 1 = (epnum * 2)
1081 */
1082unsigned int xhci_get_endpoint_index(struct usb_endpoint_descriptor *desc)
1083{
1084 unsigned int index;
1085 if (usb_endpoint_xfer_control(desc))
1086 index = (unsigned int) (usb_endpoint_num(desc)*2);
1087 else
1088 index = (unsigned int) (usb_endpoint_num(desc)*2) +
1089 (usb_endpoint_dir_in(desc) ? 1 : 0) - 1;
1090 return index;
1091}
1092
1093/* Find the flag for this endpoint (for use in the control context). Use the
1094 * endpoint index to create a bitmask. The slot context is bit 0, endpoint 0 is
1095 * bit 1, etc.
1096 */
1097unsigned int xhci_get_endpoint_flag(struct usb_endpoint_descriptor *desc)
1098{
1099 return 1 << (xhci_get_endpoint_index(desc) + 1);
1100}
1101
1102/* Find the flag for this endpoint (for use in the control context). Use the
1103 * endpoint index to create a bitmask. The slot context is bit 0, endpoint 0 is
1104 * bit 1, etc.
1105 */
1106unsigned int xhci_get_endpoint_flag_from_index(unsigned int ep_index)
1107{
1108 return 1 << (ep_index + 1);
1109}
1110
1111/* Compute the last valid endpoint context index. Basically, this is the
1112 * endpoint index plus one. For slot contexts with more than valid endpoint,
1113 * we find the most significant bit set in the added contexts flags.
1114 * e.g. ep 1 IN (with epnum 0x81) => added_ctxs = 0b1000
1115 * fls(0b1000) = 4, but the endpoint context index is 3, so subtract one.
1116 */
1117unsigned int xhci_last_valid_endpoint(u32 added_ctxs)
1118{
1119 return fls(added_ctxs) - 1;
1120}
1121
1122/* Returns 1 if the arguments are OK;
1123 * returns 0 this is a root hub; returns -EINVAL for NULL pointers.
1124 */
1125static int xhci_check_args(struct usb_hcd *hcd, struct usb_device *udev,
1126 struct usb_host_endpoint *ep, int check_ep, bool check_virt_dev,
1127 const char *func) {
1128 struct xhci_hcd *xhci;
1129 struct xhci_virt_device *virt_dev;
1130
1131 if (!hcd || (check_ep && !ep) || !udev) {
1132 printk(KERN_DEBUG "xHCI %s called with invalid args\n",
1133 func);
1134 return -EINVAL;
1135 }
1136 if (!udev->parent) {
1137 printk(KERN_DEBUG "xHCI %s called for root hub\n",
1138 func);
1139 return 0;
1140 }
1141
1142 xhci = hcd_to_xhci(hcd);
1143 if (xhci->xhc_state & XHCI_STATE_HALTED)
1144 return -ENODEV;
1145
1146 if (check_virt_dev) {
1147 if (!udev->slot_id || !xhci->devs[udev->slot_id]) {
1148 printk(KERN_DEBUG "xHCI %s called with unaddressed "
1149 "device\n", func);
1150 return -EINVAL;
1151 }
1152
1153 virt_dev = xhci->devs[udev->slot_id];
1154 if (virt_dev->udev != udev) {
1155 printk(KERN_DEBUG "xHCI %s called with udev and "
1156 "virt_dev does not match\n", func);
1157 return -EINVAL;
1158 }
1159 }
1160
1161 return 1;
1162}
1163
1164static int xhci_configure_endpoint(struct xhci_hcd *xhci,
1165 struct usb_device *udev, struct xhci_command *command,
1166 bool ctx_change, bool must_succeed);
1167
1168/*
1169 * Full speed devices may have a max packet size greater than 8 bytes, but the
1170 * USB core doesn't know that until it reads the first 8 bytes of the
1171 * descriptor. If the usb_device's max packet size changes after that point,
1172 * we need to issue an evaluate context command and wait on it.
1173 */
1174static int xhci_check_maxpacket(struct xhci_hcd *xhci, unsigned int slot_id,
1175 unsigned int ep_index, struct urb *urb)
1176{
1177 struct xhci_container_ctx *in_ctx;
1178 struct xhci_container_ctx *out_ctx;
1179 struct xhci_input_control_ctx *ctrl_ctx;
1180 struct xhci_ep_ctx *ep_ctx;
1181 int max_packet_size;
1182 int hw_max_packet_size;
1183 int ret = 0;
1184
1185 out_ctx = xhci->devs[slot_id]->out_ctx;
1186 ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
1187 hw_max_packet_size = MAX_PACKET_DECODED(le32_to_cpu(ep_ctx->ep_info2));
1188 max_packet_size = usb_endpoint_maxp(&urb->dev->ep0.desc);
1189 if (hw_max_packet_size != max_packet_size) {
1190 xhci_dbg(xhci, "Max Packet Size for ep 0 changed.\n");
1191 xhci_dbg(xhci, "Max packet size in usb_device = %d\n",
1192 max_packet_size);
1193 xhci_dbg(xhci, "Max packet size in xHCI HW = %d\n",
1194 hw_max_packet_size);
1195 xhci_dbg(xhci, "Issuing evaluate context command.\n");
1196
1197 /* Set up the modified control endpoint 0 */
1198 xhci_endpoint_copy(xhci, xhci->devs[slot_id]->in_ctx,
1199 xhci->devs[slot_id]->out_ctx, ep_index);
1200 in_ctx = xhci->devs[slot_id]->in_ctx;
1201 ep_ctx = xhci_get_ep_ctx(xhci, in_ctx, ep_index);
1202 ep_ctx->ep_info2 &= cpu_to_le32(~MAX_PACKET_MASK);
1203 ep_ctx->ep_info2 |= cpu_to_le32(MAX_PACKET(max_packet_size));
1204
1205 /* Set up the input context flags for the command */
1206 /* FIXME: This won't work if a non-default control endpoint
1207 * changes max packet sizes.
1208 */
1209 ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
1210 ctrl_ctx->add_flags = cpu_to_le32(EP0_FLAG);
1211 ctrl_ctx->drop_flags = 0;
1212
1213 xhci_dbg(xhci, "Slot %d input context\n", slot_id);
1214 xhci_dbg_ctx(xhci, in_ctx, ep_index);
1215 xhci_dbg(xhci, "Slot %d output context\n", slot_id);
1216 xhci_dbg_ctx(xhci, out_ctx, ep_index);
1217
1218 ret = xhci_configure_endpoint(xhci, urb->dev, NULL,
1219 true, false);
1220
1221 /* Clean up the input context for later use by bandwidth
1222 * functions.
1223 */
1224 ctrl_ctx->add_flags = cpu_to_le32(SLOT_FLAG);
1225 }
1226 return ret;
1227}
1228
1229/*
1230 * non-error returns are a promise to giveback() the urb later
1231 * we drop ownership so next owner (or urb unlink) can get it
1232 */
1233int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
1234{
1235 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1236 struct xhci_td *buffer;
1237 unsigned long flags;
1238 int ret = 0;
1239 unsigned int slot_id, ep_index;
1240 struct urb_priv *urb_priv;
1241 int size, i;
1242
1243 if (!urb || xhci_check_args(hcd, urb->dev, urb->ep,
1244 true, true, __func__) <= 0)
1245 return -EINVAL;
1246
1247 slot_id = urb->dev->slot_id;
1248 ep_index = xhci_get_endpoint_index(&urb->ep->desc);
1249
1250 if (!HCD_HW_ACCESSIBLE(hcd)) {
1251 if (!in_interrupt())
1252 xhci_dbg(xhci, "urb submitted during PCI suspend\n");
1253 ret = -ESHUTDOWN;
1254 goto exit;
1255 }
1256
1257 if (usb_endpoint_xfer_isoc(&urb->ep->desc))
1258 size = urb->number_of_packets;
1259 else
1260 size = 1;
1261
1262 urb_priv = kzalloc(sizeof(struct urb_priv) +
1263 size * sizeof(struct xhci_td *), mem_flags);
1264 if (!urb_priv)
1265 return -ENOMEM;
1266
1267 buffer = kzalloc(size * sizeof(struct xhci_td), mem_flags);
1268 if (!buffer) {
1269 kfree(urb_priv);
1270 return -ENOMEM;
1271 }
1272
1273 for (i = 0; i < size; i++) {
1274 urb_priv->td[i] = buffer;
1275 buffer++;
1276 }
1277
1278 urb_priv->length = size;
1279 urb_priv->td_cnt = 0;
1280 urb->hcpriv = urb_priv;
1281
1282 if (usb_endpoint_xfer_control(&urb->ep->desc)) {
1283 /* Check to see if the max packet size for the default control
1284 * endpoint changed during FS device enumeration
1285 */
1286 if (urb->dev->speed == USB_SPEED_FULL) {
1287 ret = xhci_check_maxpacket(xhci, slot_id,
1288 ep_index, urb);
1289 if (ret < 0) {
1290 xhci_urb_free_priv(xhci, urb_priv);
1291 urb->hcpriv = NULL;
1292 return ret;
1293 }
1294 }
1295
1296 /* We have a spinlock and interrupts disabled, so we must pass
1297 * atomic context to this function, which may allocate memory.
1298 */
1299 spin_lock_irqsave(&xhci->lock, flags);
1300 if (xhci->xhc_state & XHCI_STATE_DYING)
1301 goto dying;
1302 ret = xhci_queue_ctrl_tx(xhci, GFP_ATOMIC, urb,
1303 slot_id, ep_index);
1304 if (ret)
1305 goto free_priv;
1306 spin_unlock_irqrestore(&xhci->lock, flags);
1307 } else if (usb_endpoint_xfer_bulk(&urb->ep->desc)) {
1308 spin_lock_irqsave(&xhci->lock, flags);
1309 if (xhci->xhc_state & XHCI_STATE_DYING)
1310 goto dying;
1311 if (xhci->devs[slot_id]->eps[ep_index].ep_state &
1312 EP_GETTING_STREAMS) {
1313 xhci_warn(xhci, "WARN: Can't enqueue URB while bulk ep "
1314 "is transitioning to using streams.\n");
1315 ret = -EINVAL;
1316 } else if (xhci->devs[slot_id]->eps[ep_index].ep_state &
1317 EP_GETTING_NO_STREAMS) {
1318 xhci_warn(xhci, "WARN: Can't enqueue URB while bulk ep "
1319 "is transitioning to "
1320 "not having streams.\n");
1321 ret = -EINVAL;
1322 } else {
1323 ret = xhci_queue_bulk_tx(xhci, GFP_ATOMIC, urb,
1324 slot_id, ep_index);
1325 }
1326 if (ret)
1327 goto free_priv;
1328 spin_unlock_irqrestore(&xhci->lock, flags);
1329 } else if (usb_endpoint_xfer_int(&urb->ep->desc)) {
1330 spin_lock_irqsave(&xhci->lock, flags);
1331 if (xhci->xhc_state & XHCI_STATE_DYING)
1332 goto dying;
1333 ret = xhci_queue_intr_tx(xhci, GFP_ATOMIC, urb,
1334 slot_id, ep_index);
1335 if (ret)
1336 goto free_priv;
1337 spin_unlock_irqrestore(&xhci->lock, flags);
1338 } else {
1339 spin_lock_irqsave(&xhci->lock, flags);
1340 if (xhci->xhc_state & XHCI_STATE_DYING)
1341 goto dying;
1342 ret = xhci_queue_isoc_tx_prepare(xhci, GFP_ATOMIC, urb,
1343 slot_id, ep_index);
1344 if (ret)
1345 goto free_priv;
1346 spin_unlock_irqrestore(&xhci->lock, flags);
1347 }
1348exit:
1349 return ret;
1350dying:
1351 xhci_dbg(xhci, "Ep 0x%x: URB %p submitted for "
1352 "non-responsive xHCI host.\n",
1353 urb->ep->desc.bEndpointAddress, urb);
1354 ret = -ESHUTDOWN;
1355free_priv:
1356 xhci_urb_free_priv(xhci, urb_priv);
1357 urb->hcpriv = NULL;
1358 spin_unlock_irqrestore(&xhci->lock, flags);
1359 return ret;
1360}
1361
1362/* Get the right ring for the given URB.
1363 * If the endpoint supports streams, boundary check the URB's stream ID.
1364 * If the endpoint doesn't support streams, return the singular endpoint ring.
1365 */
1366static struct xhci_ring *xhci_urb_to_transfer_ring(struct xhci_hcd *xhci,
1367 struct urb *urb)
1368{
1369 unsigned int slot_id;
1370 unsigned int ep_index;
1371 unsigned int stream_id;
1372 struct xhci_virt_ep *ep;
1373
1374 slot_id = urb->dev->slot_id;
1375 ep_index = xhci_get_endpoint_index(&urb->ep->desc);
1376 stream_id = urb->stream_id;
1377 ep = &xhci->devs[slot_id]->eps[ep_index];
1378 /* Common case: no streams */
1379 if (!(ep->ep_state & EP_HAS_STREAMS))
1380 return ep->ring;
1381
1382 if (stream_id == 0) {
1383 xhci_warn(xhci,
1384 "WARN: Slot ID %u, ep index %u has streams, "
1385 "but URB has no stream ID.\n",
1386 slot_id, ep_index);
1387 return NULL;
1388 }
1389
1390 if (stream_id < ep->stream_info->num_streams)
1391 return ep->stream_info->stream_rings[stream_id];
1392
1393 xhci_warn(xhci,
1394 "WARN: Slot ID %u, ep index %u has "
1395 "stream IDs 1 to %u allocated, "
1396 "but stream ID %u is requested.\n",
1397 slot_id, ep_index,
1398 ep->stream_info->num_streams - 1,
1399 stream_id);
1400 return NULL;
1401}
1402
1403/*
1404 * Remove the URB's TD from the endpoint ring. This may cause the HC to stop
1405 * USB transfers, potentially stopping in the middle of a TRB buffer. The HC
1406 * should pick up where it left off in the TD, unless a Set Transfer Ring
1407 * Dequeue Pointer is issued.
1408 *
1409 * The TRBs that make up the buffers for the canceled URB will be "removed" from
1410 * the ring. Since the ring is a contiguous structure, they can't be physically
1411 * removed. Instead, there are two options:
1412 *
1413 * 1) If the HC is in the middle of processing the URB to be canceled, we
1414 * simply move the ring's dequeue pointer past those TRBs using the Set
1415 * Transfer Ring Dequeue Pointer command. This will be the common case,
1416 * when drivers timeout on the last submitted URB and attempt to cancel.
1417 *
1418 * 2) If the HC is in the middle of a different TD, we turn the TRBs into a
1419 * series of 1-TRB transfer no-op TDs. (No-ops shouldn't be chained.) The
1420 * HC will need to invalidate the any TRBs it has cached after the stop
1421 * endpoint command, as noted in the xHCI 0.95 errata.
1422 *
1423 * 3) The TD may have completed by the time the Stop Endpoint Command
1424 * completes, so software needs to handle that case too.
1425 *
1426 * This function should protect against the TD enqueueing code ringing the
1427 * doorbell while this code is waiting for a Stop Endpoint command to complete.
1428 * It also needs to account for multiple cancellations on happening at the same
1429 * time for the same endpoint.
1430 *
1431 * Note that this function can be called in any context, or so says
1432 * usb_hcd_unlink_urb()
1433 */
1434int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1435{
1436 unsigned long flags;
1437 int ret, i;
1438 u32 temp;
1439 struct xhci_hcd *xhci;
1440 struct urb_priv *urb_priv;
1441 struct xhci_td *td;
1442 unsigned int ep_index;
1443 struct xhci_ring *ep_ring;
1444 struct xhci_virt_ep *ep;
1445
1446 xhci = hcd_to_xhci(hcd);
1447 spin_lock_irqsave(&xhci->lock, flags);
1448 /* Make sure the URB hasn't completed or been unlinked already */
1449 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
1450 if (ret || !urb->hcpriv)
1451 goto done;
1452 temp = xhci_readl(xhci, &xhci->op_regs->status);
1453 if (temp == 0xffffffff || (xhci->xhc_state & XHCI_STATE_HALTED)) {
1454 xhci_dbg(xhci, "HW died, freeing TD.\n");
1455 urb_priv = urb->hcpriv;
1456 for (i = urb_priv->td_cnt; i < urb_priv->length; i++) {
1457 td = urb_priv->td[i];
1458 if (!list_empty(&td->td_list))
1459 list_del_init(&td->td_list);
1460 if (!list_empty(&td->cancelled_td_list))
1461 list_del_init(&td->cancelled_td_list);
1462 }
1463
1464 usb_hcd_unlink_urb_from_ep(hcd, urb);
1465 spin_unlock_irqrestore(&xhci->lock, flags);
1466 usb_hcd_giveback_urb(hcd, urb, -ESHUTDOWN);
1467 xhci_urb_free_priv(xhci, urb_priv);
1468 return ret;
1469 }
1470 if ((xhci->xhc_state & XHCI_STATE_DYING) ||
1471 (xhci->xhc_state & XHCI_STATE_HALTED)) {
1472 xhci_dbg(xhci, "Ep 0x%x: URB %p to be canceled on "
1473 "non-responsive xHCI host.\n",
1474 urb->ep->desc.bEndpointAddress, urb);
1475 /* Let the stop endpoint command watchdog timer (which set this
1476 * state) finish cleaning up the endpoint TD lists. We must
1477 * have caught it in the middle of dropping a lock and giving
1478 * back an URB.
1479 */
1480 goto done;
1481 }
1482
1483 ep_index = xhci_get_endpoint_index(&urb->ep->desc);
1484 ep = &xhci->devs[urb->dev->slot_id]->eps[ep_index];
1485 ep_ring = xhci_urb_to_transfer_ring(xhci, urb);
1486 if (!ep_ring) {
1487 ret = -EINVAL;
1488 goto done;
1489 }
1490
1491 urb_priv = urb->hcpriv;
1492 i = urb_priv->td_cnt;
1493 if (i < urb_priv->length)
1494 xhci_dbg(xhci, "Cancel URB %p, dev %s, ep 0x%x, "
1495 "starting at offset 0x%llx\n",
1496 urb, urb->dev->devpath,
1497 urb->ep->desc.bEndpointAddress,
1498 (unsigned long long) xhci_trb_virt_to_dma(
1499 urb_priv->td[i]->start_seg,
1500 urb_priv->td[i]->first_trb));
1501
1502 for (; i < urb_priv->length; i++) {
1503 td = urb_priv->td[i];
1504 list_add_tail(&td->cancelled_td_list, &ep->cancelled_td_list);
1505 }
1506
1507 /* Queue a stop endpoint command, but only if this is
1508 * the first cancellation to be handled.
1509 */
1510 if (!(ep->ep_state & EP_HALT_PENDING)) {
1511 ep->ep_state |= EP_HALT_PENDING;
1512 ep->stop_cmds_pending++;
1513 ep->stop_cmd_timer.expires = jiffies +
1514 XHCI_STOP_EP_CMD_TIMEOUT * HZ;
1515 add_timer(&ep->stop_cmd_timer);
1516 xhci_queue_stop_endpoint(xhci, urb->dev->slot_id, ep_index, 0);
1517 xhci_ring_cmd_db(xhci);
1518 }
1519done:
1520 spin_unlock_irqrestore(&xhci->lock, flags);
1521 return ret;
1522}
1523
1524/* Drop an endpoint from a new bandwidth configuration for this device.
1525 * Only one call to this function is allowed per endpoint before
1526 * check_bandwidth() or reset_bandwidth() must be called.
1527 * A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will
1528 * add the endpoint to the schedule with possibly new parameters denoted by a
1529 * different endpoint descriptor in usb_host_endpoint.
1530 * A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is
1531 * not allowed.
1532 *
1533 * The USB core will not allow URBs to be queued to an endpoint that is being
1534 * disabled, so there's no need for mutual exclusion to protect
1535 * the xhci->devs[slot_id] structure.
1536 */
1537int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
1538 struct usb_host_endpoint *ep)
1539{
1540 struct xhci_hcd *xhci;
1541 struct xhci_container_ctx *in_ctx, *out_ctx;
1542 struct xhci_input_control_ctx *ctrl_ctx;
1543 struct xhci_slot_ctx *slot_ctx;
1544 unsigned int last_ctx;
1545 unsigned int ep_index;
1546 struct xhci_ep_ctx *ep_ctx;
1547 u32 drop_flag;
1548 u32 new_add_flags, new_drop_flags, new_slot_info;
1549 int ret;
1550
1551 ret = xhci_check_args(hcd, udev, ep, 1, true, __func__);
1552 if (ret <= 0)
1553 return ret;
1554 xhci = hcd_to_xhci(hcd);
1555 if (xhci->xhc_state & XHCI_STATE_DYING)
1556 return -ENODEV;
1557
1558 xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
1559 drop_flag = xhci_get_endpoint_flag(&ep->desc);
1560 if (drop_flag == SLOT_FLAG || drop_flag == EP0_FLAG) {
1561 xhci_dbg(xhci, "xHCI %s - can't drop slot or ep 0 %#x\n",
1562 __func__, drop_flag);
1563 return 0;
1564 }
1565
1566 in_ctx = xhci->devs[udev->slot_id]->in_ctx;
1567 out_ctx = xhci->devs[udev->slot_id]->out_ctx;
1568 ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
1569 ep_index = xhci_get_endpoint_index(&ep->desc);
1570 ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
1571 /* If the HC already knows the endpoint is disabled,
1572 * or the HCD has noted it is disabled, ignore this request
1573 */
1574 if (((ep_ctx->ep_info & cpu_to_le32(EP_STATE_MASK)) ==
1575 cpu_to_le32(EP_STATE_DISABLED)) ||
1576 le32_to_cpu(ctrl_ctx->drop_flags) &
1577 xhci_get_endpoint_flag(&ep->desc)) {
1578 xhci_warn(xhci, "xHCI %s called with disabled ep %p\n",
1579 __func__, ep);
1580 return 0;
1581 }
1582
1583 ctrl_ctx->drop_flags |= cpu_to_le32(drop_flag);
1584 new_drop_flags = le32_to_cpu(ctrl_ctx->drop_flags);
1585
1586 ctrl_ctx->add_flags &= cpu_to_le32(~drop_flag);
1587 new_add_flags = le32_to_cpu(ctrl_ctx->add_flags);
1588
1589 last_ctx = xhci_last_valid_endpoint(le32_to_cpu(ctrl_ctx->add_flags));
1590 slot_ctx = xhci_get_slot_ctx(xhci, in_ctx);
1591 /* Update the last valid endpoint context, if we deleted the last one */
1592 if ((le32_to_cpu(slot_ctx->dev_info) & LAST_CTX_MASK) >
1593 LAST_CTX(last_ctx)) {
1594 slot_ctx->dev_info &= cpu_to_le32(~LAST_CTX_MASK);
1595 slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(last_ctx));
1596 }
1597 new_slot_info = le32_to_cpu(slot_ctx->dev_info);
1598
1599 xhci_endpoint_zero(xhci, xhci->devs[udev->slot_id], ep);
1600
1601 xhci_dbg(xhci, "drop ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x, new slot info = %#x\n",
1602 (unsigned int) ep->desc.bEndpointAddress,
1603 udev->slot_id,
1604 (unsigned int) new_drop_flags,
1605 (unsigned int) new_add_flags,
1606 (unsigned int) new_slot_info);
1607 return 0;
1608}
1609
1610/* Add an endpoint to a new possible bandwidth configuration for this device.
1611 * Only one call to this function is allowed per endpoint before
1612 * check_bandwidth() or reset_bandwidth() must be called.
1613 * A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will
1614 * add the endpoint to the schedule with possibly new parameters denoted by a
1615 * different endpoint descriptor in usb_host_endpoint.
1616 * A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is
1617 * not allowed.
1618 *
1619 * The USB core will not allow URBs to be queued to an endpoint until the
1620 * configuration or alt setting is installed in the device, so there's no need
1621 * for mutual exclusion to protect the xhci->devs[slot_id] structure.
1622 */
1623int xhci_add_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
1624 struct usb_host_endpoint *ep)
1625{
1626 struct xhci_hcd *xhci;
1627 struct xhci_container_ctx *in_ctx, *out_ctx;
1628 unsigned int ep_index;
1629 struct xhci_ep_ctx *ep_ctx;
1630 struct xhci_slot_ctx *slot_ctx;
1631 struct xhci_input_control_ctx *ctrl_ctx;
1632 u32 added_ctxs;
1633 unsigned int last_ctx;
1634 u32 new_add_flags, new_drop_flags, new_slot_info;
1635 struct xhci_virt_device *virt_dev;
1636 int ret = 0;
1637
1638 ret = xhci_check_args(hcd, udev, ep, 1, true, __func__);
1639 if (ret <= 0) {
1640 /* So we won't queue a reset ep command for a root hub */
1641 ep->hcpriv = NULL;
1642 return ret;
1643 }
1644 xhci = hcd_to_xhci(hcd);
1645 if (xhci->xhc_state & XHCI_STATE_DYING)
1646 return -ENODEV;
1647
1648 added_ctxs = xhci_get_endpoint_flag(&ep->desc);
1649 last_ctx = xhci_last_valid_endpoint(added_ctxs);
1650 if (added_ctxs == SLOT_FLAG || added_ctxs == EP0_FLAG) {
1651 /* FIXME when we have to issue an evaluate endpoint command to
1652 * deal with ep0 max packet size changing once we get the
1653 * descriptors
1654 */
1655 xhci_dbg(xhci, "xHCI %s - can't add slot or ep 0 %#x\n",
1656 __func__, added_ctxs);
1657 return 0;
1658 }
1659
1660 virt_dev = xhci->devs[udev->slot_id];
1661 in_ctx = virt_dev->in_ctx;
1662 out_ctx = virt_dev->out_ctx;
1663 ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
1664 ep_index = xhci_get_endpoint_index(&ep->desc);
1665 ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
1666
1667 /* If this endpoint is already in use, and the upper layers are trying
1668 * to add it again without dropping it, reject the addition.
1669 */
1670 if (virt_dev->eps[ep_index].ring &&
1671 !(le32_to_cpu(ctrl_ctx->drop_flags) &
1672 xhci_get_endpoint_flag(&ep->desc))) {
1673 xhci_warn(xhci, "Trying to add endpoint 0x%x "
1674 "without dropping it.\n",
1675 (unsigned int) ep->desc.bEndpointAddress);
1676 return -EINVAL;
1677 }
1678
1679 /* If the HCD has already noted the endpoint is enabled,
1680 * ignore this request.
1681 */
1682 if (le32_to_cpu(ctrl_ctx->add_flags) &
1683 xhci_get_endpoint_flag(&ep->desc)) {
1684 xhci_warn(xhci, "xHCI %s called with enabled ep %p\n",
1685 __func__, ep);
1686 return 0;
1687 }
1688
1689 /*
1690 * Configuration and alternate setting changes must be done in
1691 * process context, not interrupt context (or so documenation
1692 * for usb_set_interface() and usb_set_configuration() claim).
1693 */
1694 if (xhci_endpoint_init(xhci, virt_dev, udev, ep, GFP_NOIO) < 0) {
1695 dev_dbg(&udev->dev, "%s - could not initialize ep %#x\n",
1696 __func__, ep->desc.bEndpointAddress);
1697 return -ENOMEM;
1698 }
1699
1700 ctrl_ctx->add_flags |= cpu_to_le32(added_ctxs);
1701 new_add_flags = le32_to_cpu(ctrl_ctx->add_flags);
1702
1703 /* If xhci_endpoint_disable() was called for this endpoint, but the
1704 * xHC hasn't been notified yet through the check_bandwidth() call,
1705 * this re-adds a new state for the endpoint from the new endpoint
1706 * descriptors. We must drop and re-add this endpoint, so we leave the
1707 * drop flags alone.
1708 */
1709 new_drop_flags = le32_to_cpu(ctrl_ctx->drop_flags);
1710
1711 slot_ctx = xhci_get_slot_ctx(xhci, in_ctx);
1712 /* Update the last valid endpoint context, if we just added one past */
1713 if ((le32_to_cpu(slot_ctx->dev_info) & LAST_CTX_MASK) <
1714 LAST_CTX(last_ctx)) {
1715 slot_ctx->dev_info &= cpu_to_le32(~LAST_CTX_MASK);
1716 slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(last_ctx));
1717 }
1718 new_slot_info = le32_to_cpu(slot_ctx->dev_info);
1719
1720 /* Store the usb_device pointer for later use */
1721 ep->hcpriv = udev;
1722
1723 xhci_dbg(xhci, "add ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x, new slot info = %#x\n",
1724 (unsigned int) ep->desc.bEndpointAddress,
1725 udev->slot_id,
1726 (unsigned int) new_drop_flags,
1727 (unsigned int) new_add_flags,
1728 (unsigned int) new_slot_info);
1729 return 0;
1730}
1731
1732static void xhci_zero_in_ctx(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev)
1733{
1734 struct xhci_input_control_ctx *ctrl_ctx;
1735 struct xhci_ep_ctx *ep_ctx;
1736 struct xhci_slot_ctx *slot_ctx;
1737 int i;
1738
1739 /* When a device's add flag and drop flag are zero, any subsequent
1740 * configure endpoint command will leave that endpoint's state
1741 * untouched. Make sure we don't leave any old state in the input
1742 * endpoint contexts.
1743 */
1744 ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
1745 ctrl_ctx->drop_flags = 0;
1746 ctrl_ctx->add_flags = 0;
1747 slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
1748 slot_ctx->dev_info &= cpu_to_le32(~LAST_CTX_MASK);
1749 /* Endpoint 0 is always valid */
1750 slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(1));
1751 for (i = 1; i < 31; ++i) {
1752 ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, i);
1753 ep_ctx->ep_info = 0;
1754 ep_ctx->ep_info2 = 0;
1755 ep_ctx->deq = 0;
1756 ep_ctx->tx_info = 0;
1757 }
1758}
1759
1760static int xhci_configure_endpoint_result(struct xhci_hcd *xhci,
1761 struct usb_device *udev, u32 *cmd_status)
1762{
1763 int ret;
1764
1765 switch (*cmd_status) {
1766 case COMP_ENOMEM:
1767 dev_warn(&udev->dev, "Not enough host controller resources "
1768 "for new device state.\n");
1769 ret = -ENOMEM;
1770 /* FIXME: can we allocate more resources for the HC? */
1771 break;
1772 case COMP_BW_ERR:
1773 case COMP_2ND_BW_ERR:
1774 dev_warn(&udev->dev, "Not enough bandwidth "
1775 "for new device state.\n");
1776 ret = -ENOSPC;
1777 /* FIXME: can we go back to the old state? */
1778 break;
1779 case COMP_TRB_ERR:
1780 /* the HCD set up something wrong */
1781 dev_warn(&udev->dev, "ERROR: Endpoint drop flag = 0, "
1782 "add flag = 1, "
1783 "and endpoint is not disabled.\n");
1784 ret = -EINVAL;
1785 break;
1786 case COMP_DEV_ERR:
1787 dev_warn(&udev->dev, "ERROR: Incompatible device for endpoint "
1788 "configure command.\n");
1789 ret = -ENODEV;
1790 break;
1791 case COMP_SUCCESS:
1792 dev_dbg(&udev->dev, "Successful Endpoint Configure command\n");
1793 ret = 0;
1794 break;
1795 default:
1796 xhci_err(xhci, "ERROR: unexpected command completion "
1797 "code 0x%x.\n", *cmd_status);
1798 ret = -EINVAL;
1799 break;
1800 }
1801 return ret;
1802}
1803
1804static int xhci_evaluate_context_result(struct xhci_hcd *xhci,
1805 struct usb_device *udev, u32 *cmd_status)
1806{
1807 int ret;
1808 struct xhci_virt_device *virt_dev = xhci->devs[udev->slot_id];
1809
1810 switch (*cmd_status) {
1811 case COMP_EINVAL:
1812 dev_warn(&udev->dev, "WARN: xHCI driver setup invalid evaluate "
1813 "context command.\n");
1814 ret = -EINVAL;
1815 break;
1816 case COMP_EBADSLT:
1817 dev_warn(&udev->dev, "WARN: slot not enabled for"
1818 "evaluate context command.\n");
1819 case COMP_CTX_STATE:
1820 dev_warn(&udev->dev, "WARN: invalid context state for "
1821 "evaluate context command.\n");
1822 xhci_dbg_ctx(xhci, virt_dev->out_ctx, 1);
1823 ret = -EINVAL;
1824 break;
1825 case COMP_DEV_ERR:
1826 dev_warn(&udev->dev, "ERROR: Incompatible device for evaluate "
1827 "context command.\n");
1828 ret = -ENODEV;
1829 break;
1830 case COMP_MEL_ERR:
1831 /* Max Exit Latency too large error */
1832 dev_warn(&udev->dev, "WARN: Max Exit Latency too large\n");
1833 ret = -EINVAL;
1834 break;
1835 case COMP_SUCCESS:
1836 dev_dbg(&udev->dev, "Successful evaluate context command\n");
1837 ret = 0;
1838 break;
1839 default:
1840 xhci_err(xhci, "ERROR: unexpected command completion "
1841 "code 0x%x.\n", *cmd_status);
1842 ret = -EINVAL;
1843 break;
1844 }
1845 return ret;
1846}
1847
1848static u32 xhci_count_num_new_endpoints(struct xhci_hcd *xhci,
1849 struct xhci_container_ctx *in_ctx)
1850{
1851 struct xhci_input_control_ctx *ctrl_ctx;
1852 u32 valid_add_flags;
1853 u32 valid_drop_flags;
1854
1855 ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
1856 /* Ignore the slot flag (bit 0), and the default control endpoint flag
1857 * (bit 1). The default control endpoint is added during the Address
1858 * Device command and is never removed until the slot is disabled.
1859 */
1860 valid_add_flags = ctrl_ctx->add_flags >> 2;
1861 valid_drop_flags = ctrl_ctx->drop_flags >> 2;
1862
1863 /* Use hweight32 to count the number of ones in the add flags, or
1864 * number of endpoints added. Don't count endpoints that are changed
1865 * (both added and dropped).
1866 */
1867 return hweight32(valid_add_flags) -
1868 hweight32(valid_add_flags & valid_drop_flags);
1869}
1870
1871static unsigned int xhci_count_num_dropped_endpoints(struct xhci_hcd *xhci,
1872 struct xhci_container_ctx *in_ctx)
1873{
1874 struct xhci_input_control_ctx *ctrl_ctx;
1875 u32 valid_add_flags;
1876 u32 valid_drop_flags;
1877
1878 ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
1879 valid_add_flags = ctrl_ctx->add_flags >> 2;
1880 valid_drop_flags = ctrl_ctx->drop_flags >> 2;
1881
1882 return hweight32(valid_drop_flags) -
1883 hweight32(valid_add_flags & valid_drop_flags);
1884}
1885
1886/*
1887 * We need to reserve the new number of endpoints before the configure endpoint
1888 * command completes. We can't subtract the dropped endpoints from the number
1889 * of active endpoints until the command completes because we can oversubscribe
1890 * the host in this case:
1891 *
1892 * - the first configure endpoint command drops more endpoints than it adds
1893 * - a second configure endpoint command that adds more endpoints is queued
1894 * - the first configure endpoint command fails, so the config is unchanged
1895 * - the second command may succeed, even though there isn't enough resources
1896 *
1897 * Must be called with xhci->lock held.
1898 */
1899static int xhci_reserve_host_resources(struct xhci_hcd *xhci,
1900 struct xhci_container_ctx *in_ctx)
1901{
1902 u32 added_eps;
1903
1904 added_eps = xhci_count_num_new_endpoints(xhci, in_ctx);
1905 if (xhci->num_active_eps + added_eps > xhci->limit_active_eps) {
1906 xhci_dbg(xhci, "Not enough ep ctxs: "
1907 "%u active, need to add %u, limit is %u.\n",
1908 xhci->num_active_eps, added_eps,
1909 xhci->limit_active_eps);
1910 return -ENOMEM;
1911 }
1912 xhci->num_active_eps += added_eps;
1913 xhci_dbg(xhci, "Adding %u ep ctxs, %u now active.\n", added_eps,
1914 xhci->num_active_eps);
1915 return 0;
1916}
1917
1918/*
1919 * The configure endpoint was failed by the xHC for some other reason, so we
1920 * need to revert the resources that failed configuration would have used.
1921 *
1922 * Must be called with xhci->lock held.
1923 */
1924static void xhci_free_host_resources(struct xhci_hcd *xhci,
1925 struct xhci_container_ctx *in_ctx)
1926{
1927 u32 num_failed_eps;
1928
1929 num_failed_eps = xhci_count_num_new_endpoints(xhci, in_ctx);
1930 xhci->num_active_eps -= num_failed_eps;
1931 xhci_dbg(xhci, "Removing %u failed ep ctxs, %u now active.\n",
1932 num_failed_eps,
1933 xhci->num_active_eps);
1934}
1935
1936/*
1937 * Now that the command has completed, clean up the active endpoint count by
1938 * subtracting out the endpoints that were dropped (but not changed).
1939 *
1940 * Must be called with xhci->lock held.
1941 */
1942static void xhci_finish_resource_reservation(struct xhci_hcd *xhci,
1943 struct xhci_container_ctx *in_ctx)
1944{
1945 u32 num_dropped_eps;
1946
1947 num_dropped_eps = xhci_count_num_dropped_endpoints(xhci, in_ctx);
1948 xhci->num_active_eps -= num_dropped_eps;
1949 if (num_dropped_eps)
1950 xhci_dbg(xhci, "Removing %u dropped ep ctxs, %u now active.\n",
1951 num_dropped_eps,
1952 xhci->num_active_eps);
1953}
1954
1955unsigned int xhci_get_block_size(struct usb_device *udev)
1956{
1957 switch (udev->speed) {
1958 case USB_SPEED_LOW:
1959 case USB_SPEED_FULL:
1960 return FS_BLOCK;
1961 case USB_SPEED_HIGH:
1962 return HS_BLOCK;
1963 case USB_SPEED_SUPER:
1964 return SS_BLOCK;
1965 case USB_SPEED_UNKNOWN:
1966 case USB_SPEED_WIRELESS:
1967 default:
1968 /* Should never happen */
1969 return 1;
1970 }
1971}
1972
1973unsigned int xhci_get_largest_overhead(struct xhci_interval_bw *interval_bw)
1974{
1975 if (interval_bw->overhead[LS_OVERHEAD_TYPE])
1976 return LS_OVERHEAD;
1977 if (interval_bw->overhead[FS_OVERHEAD_TYPE])
1978 return FS_OVERHEAD;
1979 return HS_OVERHEAD;
1980}
1981
1982/* If we are changing a LS/FS device under a HS hub,
1983 * make sure (if we are activating a new TT) that the HS bus has enough
1984 * bandwidth for this new TT.
1985 */
1986static int xhci_check_tt_bw_table(struct xhci_hcd *xhci,
1987 struct xhci_virt_device *virt_dev,
1988 int old_active_eps)
1989{
1990 struct xhci_interval_bw_table *bw_table;
1991 struct xhci_tt_bw_info *tt_info;
1992
1993 /* Find the bandwidth table for the root port this TT is attached to. */
1994 bw_table = &xhci->rh_bw[virt_dev->real_port - 1].bw_table;
1995 tt_info = virt_dev->tt_info;
1996 /* If this TT already had active endpoints, the bandwidth for this TT
1997 * has already been added. Removing all periodic endpoints (and thus
1998 * making the TT enactive) will only decrease the bandwidth used.
1999 */
2000 if (old_active_eps)
2001 return 0;
2002 if (old_active_eps == 0 && tt_info->active_eps != 0) {
2003 if (bw_table->bw_used + TT_HS_OVERHEAD > HS_BW_LIMIT)
2004 return -ENOMEM;
2005 return 0;
2006 }
2007 /* Not sure why we would have no new active endpoints...
2008 *
2009 * Maybe because of an Evaluate Context change for a hub update or a
2010 * control endpoint 0 max packet size change?
2011 * FIXME: skip the bandwidth calculation in that case.
2012 */
2013 return 0;
2014}
2015
2016static int xhci_check_ss_bw(struct xhci_hcd *xhci,
2017 struct xhci_virt_device *virt_dev)
2018{
2019 unsigned int bw_reserved;
2020
2021 bw_reserved = DIV_ROUND_UP(SS_BW_RESERVED*SS_BW_LIMIT_IN, 100);
2022 if (virt_dev->bw_table->ss_bw_in > (SS_BW_LIMIT_IN - bw_reserved))
2023 return -ENOMEM;
2024
2025 bw_reserved = DIV_ROUND_UP(SS_BW_RESERVED*SS_BW_LIMIT_OUT, 100);
2026 if (virt_dev->bw_table->ss_bw_out > (SS_BW_LIMIT_OUT - bw_reserved))
2027 return -ENOMEM;
2028
2029 return 0;
2030}
2031
2032/*
2033 * This algorithm is a very conservative estimate of the worst-case scheduling
2034 * scenario for any one interval. The hardware dynamically schedules the
2035 * packets, so we can't tell which microframe could be the limiting factor in
2036 * the bandwidth scheduling. This only takes into account periodic endpoints.
2037 *
2038 * Obviously, we can't solve an NP complete problem to find the minimum worst
2039 * case scenario. Instead, we come up with an estimate that is no less than
2040 * the worst case bandwidth used for any one microframe, but may be an
2041 * over-estimate.
2042 *
2043 * We walk the requirements for each endpoint by interval, starting with the
2044 * smallest interval, and place packets in the schedule where there is only one
2045 * possible way to schedule packets for that interval. In order to simplify
2046 * this algorithm, we record the largest max packet size for each interval, and
2047 * assume all packets will be that size.
2048 *
2049 * For interval 0, we obviously must schedule all packets for each interval.
2050 * The bandwidth for interval 0 is just the amount of data to be transmitted
2051 * (the sum of all max ESIT payload sizes, plus any overhead per packet times
2052 * the number of packets).
2053 *
2054 * For interval 1, we have two possible microframes to schedule those packets
2055 * in. For this algorithm, if we can schedule the same number of packets for
2056 * each possible scheduling opportunity (each microframe), we will do so. The
2057 * remaining number of packets will be saved to be transmitted in the gaps in
2058 * the next interval's scheduling sequence.
2059 *
2060 * As we move those remaining packets to be scheduled with interval 2 packets,
2061 * we have to double the number of remaining packets to transmit. This is
2062 * because the intervals are actually powers of 2, and we would be transmitting
2063 * the previous interval's packets twice in this interval. We also have to be
2064 * sure that when we look at the largest max packet size for this interval, we
2065 * also look at the largest max packet size for the remaining packets and take
2066 * the greater of the two.
2067 *
2068 * The algorithm continues to evenly distribute packets in each scheduling
2069 * opportunity, and push the remaining packets out, until we get to the last
2070 * interval. Then those packets and their associated overhead are just added
2071 * to the bandwidth used.
2072 */
2073static int xhci_check_bw_table(struct xhci_hcd *xhci,
2074 struct xhci_virt_device *virt_dev,
2075 int old_active_eps)
2076{
2077 unsigned int bw_reserved;
2078 unsigned int max_bandwidth;
2079 unsigned int bw_used;
2080 unsigned int block_size;
2081 struct xhci_interval_bw_table *bw_table;
2082 unsigned int packet_size = 0;
2083 unsigned int overhead = 0;
2084 unsigned int packets_transmitted = 0;
2085 unsigned int packets_remaining = 0;
2086 unsigned int i;
2087
2088 if (virt_dev->udev->speed == USB_SPEED_SUPER)
2089 return xhci_check_ss_bw(xhci, virt_dev);
2090
2091 if (virt_dev->udev->speed == USB_SPEED_HIGH) {
2092 max_bandwidth = HS_BW_LIMIT;
2093 /* Convert percent of bus BW reserved to blocks reserved */
2094 bw_reserved = DIV_ROUND_UP(HS_BW_RESERVED * max_bandwidth, 100);
2095 } else {
2096 max_bandwidth = FS_BW_LIMIT;
2097 bw_reserved = DIV_ROUND_UP(FS_BW_RESERVED * max_bandwidth, 100);
2098 }
2099
2100 bw_table = virt_dev->bw_table;
2101 /* We need to translate the max packet size and max ESIT payloads into
2102 * the units the hardware uses.
2103 */
2104 block_size = xhci_get_block_size(virt_dev->udev);
2105
2106 /* If we are manipulating a LS/FS device under a HS hub, double check
2107 * that the HS bus has enough bandwidth if we are activing a new TT.
2108 */
2109 if (virt_dev->tt_info) {
2110 xhci_dbg(xhci, "Recalculating BW for rootport %u\n",
2111 virt_dev->real_port);
2112 if (xhci_check_tt_bw_table(xhci, virt_dev, old_active_eps)) {
2113 xhci_warn(xhci, "Not enough bandwidth on HS bus for "
2114 "newly activated TT.\n");
2115 return -ENOMEM;
2116 }
2117 xhci_dbg(xhci, "Recalculating BW for TT slot %u port %u\n",
2118 virt_dev->tt_info->slot_id,
2119 virt_dev->tt_info->ttport);
2120 } else {
2121 xhci_dbg(xhci, "Recalculating BW for rootport %u\n",
2122 virt_dev->real_port);
2123 }
2124
2125 /* Add in how much bandwidth will be used for interval zero, or the
2126 * rounded max ESIT payload + number of packets * largest overhead.
2127 */
2128 bw_used = DIV_ROUND_UP(bw_table->interval0_esit_payload, block_size) +
2129 bw_table->interval_bw[0].num_packets *
2130 xhci_get_largest_overhead(&bw_table->interval_bw[0]);
2131
2132 for (i = 1; i < XHCI_MAX_INTERVAL; i++) {
2133 unsigned int bw_added;
2134 unsigned int largest_mps;
2135 unsigned int interval_overhead;
2136
2137 /*
2138 * How many packets could we transmit in this interval?
2139 * If packets didn't fit in the previous interval, we will need
2140 * to transmit that many packets twice within this interval.
2141 */
2142 packets_remaining = 2 * packets_remaining +
2143 bw_table->interval_bw[i].num_packets;
2144
2145 /* Find the largest max packet size of this or the previous
2146 * interval.
2147 */
2148 if (list_empty(&bw_table->interval_bw[i].endpoints))
2149 largest_mps = 0;
2150 else {
2151 struct xhci_virt_ep *virt_ep;
2152 struct list_head *ep_entry;
2153
2154 ep_entry = bw_table->interval_bw[i].endpoints.next;
2155 virt_ep = list_entry(ep_entry,
2156 struct xhci_virt_ep, bw_endpoint_list);
2157 /* Convert to blocks, rounding up */
2158 largest_mps = DIV_ROUND_UP(
2159 virt_ep->bw_info.max_packet_size,
2160 block_size);
2161 }
2162 if (largest_mps > packet_size)
2163 packet_size = largest_mps;
2164
2165 /* Use the larger overhead of this or the previous interval. */
2166 interval_overhead = xhci_get_largest_overhead(
2167 &bw_table->interval_bw[i]);
2168 if (interval_overhead > overhead)
2169 overhead = interval_overhead;
2170
2171 /* How many packets can we evenly distribute across
2172 * (1 << (i + 1)) possible scheduling opportunities?
2173 */
2174 packets_transmitted = packets_remaining >> (i + 1);
2175
2176 /* Add in the bandwidth used for those scheduled packets */
2177 bw_added = packets_transmitted * (overhead + packet_size);
2178
2179 /* How many packets do we have remaining to transmit? */
2180 packets_remaining = packets_remaining % (1 << (i + 1));
2181
2182 /* What largest max packet size should those packets have? */
2183 /* If we've transmitted all packets, don't carry over the
2184 * largest packet size.
2185 */
2186 if (packets_remaining == 0) {
2187 packet_size = 0;
2188 overhead = 0;
2189 } else if (packets_transmitted > 0) {
2190 /* Otherwise if we do have remaining packets, and we've
2191 * scheduled some packets in this interval, take the
2192 * largest max packet size from endpoints with this
2193 * interval.
2194 */
2195 packet_size = largest_mps;
2196 overhead = interval_overhead;
2197 }
2198 /* Otherwise carry over packet_size and overhead from the last
2199 * time we had a remainder.
2200 */
2201 bw_used += bw_added;
2202 if (bw_used > max_bandwidth) {
2203 xhci_warn(xhci, "Not enough bandwidth. "
2204 "Proposed: %u, Max: %u\n",
2205 bw_used, max_bandwidth);
2206 return -ENOMEM;
2207 }
2208 }
2209 /*
2210 * Ok, we know we have some packets left over after even-handedly
2211 * scheduling interval 15. We don't know which microframes they will
2212 * fit into, so we over-schedule and say they will be scheduled every
2213 * microframe.
2214 */
2215 if (packets_remaining > 0)
2216 bw_used += overhead + packet_size;
2217
2218 if (!virt_dev->tt_info && virt_dev->udev->speed == USB_SPEED_HIGH) {
2219 unsigned int port_index = virt_dev->real_port - 1;
2220
2221 /* OK, we're manipulating a HS device attached to a
2222 * root port bandwidth domain. Include the number of active TTs
2223 * in the bandwidth used.
2224 */
2225 bw_used += TT_HS_OVERHEAD *
2226 xhci->rh_bw[port_index].num_active_tts;
2227 }
2228
2229 xhci_dbg(xhci, "Final bandwidth: %u, Limit: %u, Reserved: %u, "
2230 "Available: %u " "percent\n",
2231 bw_used, max_bandwidth, bw_reserved,
2232 (max_bandwidth - bw_used - bw_reserved) * 100 /
2233 max_bandwidth);
2234
2235 bw_used += bw_reserved;
2236 if (bw_used > max_bandwidth) {
2237 xhci_warn(xhci, "Not enough bandwidth. Proposed: %u, Max: %u\n",
2238 bw_used, max_bandwidth);
2239 return -ENOMEM;
2240 }
2241
2242 bw_table->bw_used = bw_used;
2243 return 0;
2244}
2245
2246static bool xhci_is_async_ep(unsigned int ep_type)
2247{
2248 return (ep_type != ISOC_OUT_EP && ep_type != INT_OUT_EP &&
2249 ep_type != ISOC_IN_EP &&
2250 ep_type != INT_IN_EP);
2251}
2252
2253static bool xhci_is_sync_in_ep(unsigned int ep_type)
2254{
2255 return (ep_type == ISOC_IN_EP || ep_type != INT_IN_EP);
2256}
2257
2258static unsigned int xhci_get_ss_bw_consumed(struct xhci_bw_info *ep_bw)
2259{
2260 unsigned int mps = DIV_ROUND_UP(ep_bw->max_packet_size, SS_BLOCK);
2261
2262 if (ep_bw->ep_interval == 0)
2263 return SS_OVERHEAD_BURST +
2264 (ep_bw->mult * ep_bw->num_packets *
2265 (SS_OVERHEAD + mps));
2266 return DIV_ROUND_UP(ep_bw->mult * ep_bw->num_packets *
2267 (SS_OVERHEAD + mps + SS_OVERHEAD_BURST),
2268 1 << ep_bw->ep_interval);
2269
2270}
2271
2272void xhci_drop_ep_from_interval_table(struct xhci_hcd *xhci,
2273 struct xhci_bw_info *ep_bw,
2274 struct xhci_interval_bw_table *bw_table,
2275 struct usb_device *udev,
2276 struct xhci_virt_ep *virt_ep,
2277 struct xhci_tt_bw_info *tt_info)
2278{
2279 struct xhci_interval_bw *interval_bw;
2280 int normalized_interval;
2281
2282 if (xhci_is_async_ep(ep_bw->type))
2283 return;
2284
2285 if (udev->speed == USB_SPEED_SUPER) {
2286 if (xhci_is_sync_in_ep(ep_bw->type))
2287 xhci->devs[udev->slot_id]->bw_table->ss_bw_in -=
2288 xhci_get_ss_bw_consumed(ep_bw);
2289 else
2290 xhci->devs[udev->slot_id]->bw_table->ss_bw_out -=
2291 xhci_get_ss_bw_consumed(ep_bw);
2292 return;
2293 }
2294
2295 /* SuperSpeed endpoints never get added to intervals in the table, so
2296 * this check is only valid for HS/FS/LS devices.
2297 */
2298 if (list_empty(&virt_ep->bw_endpoint_list))
2299 return;
2300 /* For LS/FS devices, we need to translate the interval expressed in
2301 * microframes to frames.
2302 */
2303 if (udev->speed == USB_SPEED_HIGH)
2304 normalized_interval = ep_bw->ep_interval;
2305 else
2306 normalized_interval = ep_bw->ep_interval - 3;
2307
2308 if (normalized_interval == 0)
2309 bw_table->interval0_esit_payload -= ep_bw->max_esit_payload;
2310 interval_bw = &bw_table->interval_bw[normalized_interval];
2311 interval_bw->num_packets -= ep_bw->num_packets;
2312 switch (udev->speed) {
2313 case USB_SPEED_LOW:
2314 interval_bw->overhead[LS_OVERHEAD_TYPE] -= 1;
2315 break;
2316 case USB_SPEED_FULL:
2317 interval_bw->overhead[FS_OVERHEAD_TYPE] -= 1;
2318 break;
2319 case USB_SPEED_HIGH:
2320 interval_bw->overhead[HS_OVERHEAD_TYPE] -= 1;
2321 break;
2322 case USB_SPEED_SUPER:
2323 case USB_SPEED_UNKNOWN:
2324 case USB_SPEED_WIRELESS:
2325 /* Should never happen because only LS/FS/HS endpoints will get
2326 * added to the endpoint list.
2327 */
2328 return;
2329 }
2330 if (tt_info)
2331 tt_info->active_eps -= 1;
2332 list_del_init(&virt_ep->bw_endpoint_list);
2333}
2334
2335static void xhci_add_ep_to_interval_table(struct xhci_hcd *xhci,
2336 struct xhci_bw_info *ep_bw,
2337 struct xhci_interval_bw_table *bw_table,
2338 struct usb_device *udev,
2339 struct xhci_virt_ep *virt_ep,
2340 struct xhci_tt_bw_info *tt_info)
2341{
2342 struct xhci_interval_bw *interval_bw;
2343 struct xhci_virt_ep *smaller_ep;
2344 int normalized_interval;
2345
2346 if (xhci_is_async_ep(ep_bw->type))
2347 return;
2348
2349 if (udev->speed == USB_SPEED_SUPER) {
2350 if (xhci_is_sync_in_ep(ep_bw->type))
2351 xhci->devs[udev->slot_id]->bw_table->ss_bw_in +=
2352 xhci_get_ss_bw_consumed(ep_bw);
2353 else
2354 xhci->devs[udev->slot_id]->bw_table->ss_bw_out +=
2355 xhci_get_ss_bw_consumed(ep_bw);
2356 return;
2357 }
2358
2359 /* For LS/FS devices, we need to translate the interval expressed in
2360 * microframes to frames.
2361 */
2362 if (udev->speed == USB_SPEED_HIGH)
2363 normalized_interval = ep_bw->ep_interval;
2364 else
2365 normalized_interval = ep_bw->ep_interval - 3;
2366
2367 if (normalized_interval == 0)
2368 bw_table->interval0_esit_payload += ep_bw->max_esit_payload;
2369 interval_bw = &bw_table->interval_bw[normalized_interval];
2370 interval_bw->num_packets += ep_bw->num_packets;
2371 switch (udev->speed) {
2372 case USB_SPEED_LOW:
2373 interval_bw->overhead[LS_OVERHEAD_TYPE] += 1;
2374 break;
2375 case USB_SPEED_FULL:
2376 interval_bw->overhead[FS_OVERHEAD_TYPE] += 1;
2377 break;
2378 case USB_SPEED_HIGH:
2379 interval_bw->overhead[HS_OVERHEAD_TYPE] += 1;
2380 break;
2381 case USB_SPEED_SUPER:
2382 case USB_SPEED_UNKNOWN:
2383 case USB_SPEED_WIRELESS:
2384 /* Should never happen because only LS/FS/HS endpoints will get
2385 * added to the endpoint list.
2386 */
2387 return;
2388 }
2389
2390 if (tt_info)
2391 tt_info->active_eps += 1;
2392 /* Insert the endpoint into the list, largest max packet size first. */
2393 list_for_each_entry(smaller_ep, &interval_bw->endpoints,
2394 bw_endpoint_list) {
2395 if (ep_bw->max_packet_size >=
2396 smaller_ep->bw_info.max_packet_size) {
2397 /* Add the new ep before the smaller endpoint */
2398 list_add_tail(&virt_ep->bw_endpoint_list,
2399 &smaller_ep->bw_endpoint_list);
2400 return;
2401 }
2402 }
2403 /* Add the new endpoint at the end of the list. */
2404 list_add_tail(&virt_ep->bw_endpoint_list,
2405 &interval_bw->endpoints);
2406}
2407
2408void xhci_update_tt_active_eps(struct xhci_hcd *xhci,
2409 struct xhci_virt_device *virt_dev,
2410 int old_active_eps)
2411{
2412 struct xhci_root_port_bw_info *rh_bw_info;
2413 if (!virt_dev->tt_info)
2414 return;
2415
2416 rh_bw_info = &xhci->rh_bw[virt_dev->real_port - 1];
2417 if (old_active_eps == 0 &&
2418 virt_dev->tt_info->active_eps != 0) {
2419 rh_bw_info->num_active_tts += 1;
2420 rh_bw_info->bw_table.bw_used += TT_HS_OVERHEAD;
2421 } else if (old_active_eps != 0 &&
2422 virt_dev->tt_info->active_eps == 0) {
2423 rh_bw_info->num_active_tts -= 1;
2424 rh_bw_info->bw_table.bw_used -= TT_HS_OVERHEAD;
2425 }
2426}
2427
2428static int xhci_reserve_bandwidth(struct xhci_hcd *xhci,
2429 struct xhci_virt_device *virt_dev,
2430 struct xhci_container_ctx *in_ctx)
2431{
2432 struct xhci_bw_info ep_bw_info[31];
2433 int i;
2434 struct xhci_input_control_ctx *ctrl_ctx;
2435 int old_active_eps = 0;
2436
2437 if (virt_dev->tt_info)
2438 old_active_eps = virt_dev->tt_info->active_eps;
2439
2440 ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
2441
2442 for (i = 0; i < 31; i++) {
2443 if (!EP_IS_ADDED(ctrl_ctx, i) && !EP_IS_DROPPED(ctrl_ctx, i))
2444 continue;
2445
2446 /* Make a copy of the BW info in case we need to revert this */
2447 memcpy(&ep_bw_info[i], &virt_dev->eps[i].bw_info,
2448 sizeof(ep_bw_info[i]));
2449 /* Drop the endpoint from the interval table if the endpoint is
2450 * being dropped or changed.
2451 */
2452 if (EP_IS_DROPPED(ctrl_ctx, i))
2453 xhci_drop_ep_from_interval_table(xhci,
2454 &virt_dev->eps[i].bw_info,
2455 virt_dev->bw_table,
2456 virt_dev->udev,
2457 &virt_dev->eps[i],
2458 virt_dev->tt_info);
2459 }
2460 /* Overwrite the information stored in the endpoints' bw_info */
2461 xhci_update_bw_info(xhci, virt_dev->in_ctx, ctrl_ctx, virt_dev);
2462 for (i = 0; i < 31; i++) {
2463 /* Add any changed or added endpoints to the interval table */
2464 if (EP_IS_ADDED(ctrl_ctx, i))
2465 xhci_add_ep_to_interval_table(xhci,
2466 &virt_dev->eps[i].bw_info,
2467 virt_dev->bw_table,
2468 virt_dev->udev,
2469 &virt_dev->eps[i],
2470 virt_dev->tt_info);
2471 }
2472
2473 if (!xhci_check_bw_table(xhci, virt_dev, old_active_eps)) {
2474 /* Ok, this fits in the bandwidth we have.
2475 * Update the number of active TTs.
2476 */
2477 xhci_update_tt_active_eps(xhci, virt_dev, old_active_eps);
2478 return 0;
2479 }
2480
2481 /* We don't have enough bandwidth for this, revert the stored info. */
2482 for (i = 0; i < 31; i++) {
2483 if (!EP_IS_ADDED(ctrl_ctx, i) && !EP_IS_DROPPED(ctrl_ctx, i))
2484 continue;
2485
2486 /* Drop the new copies of any added or changed endpoints from
2487 * the interval table.
2488 */
2489 if (EP_IS_ADDED(ctrl_ctx, i)) {
2490 xhci_drop_ep_from_interval_table(xhci,
2491 &virt_dev->eps[i].bw_info,
2492 virt_dev->bw_table,
2493 virt_dev->udev,
2494 &virt_dev->eps[i],
2495 virt_dev->tt_info);
2496 }
2497 /* Revert the endpoint back to its old information */
2498 memcpy(&virt_dev->eps[i].bw_info, &ep_bw_info[i],
2499 sizeof(ep_bw_info[i]));
2500 /* Add any changed or dropped endpoints back into the table */
2501 if (EP_IS_DROPPED(ctrl_ctx, i))
2502 xhci_add_ep_to_interval_table(xhci,
2503 &virt_dev->eps[i].bw_info,
2504 virt_dev->bw_table,
2505 virt_dev->udev,
2506 &virt_dev->eps[i],
2507 virt_dev->tt_info);
2508 }
2509 return -ENOMEM;
2510}
2511
2512
2513/* Issue a configure endpoint command or evaluate context command
2514 * and wait for it to finish.
2515 */
2516static int xhci_configure_endpoint(struct xhci_hcd *xhci,
2517 struct usb_device *udev,
2518 struct xhci_command *command,
2519 bool ctx_change, bool must_succeed)
2520{
2521 int ret;
2522 int timeleft;
2523 unsigned long flags;
2524 struct xhci_container_ctx *in_ctx;
2525 struct completion *cmd_completion;
2526 u32 *cmd_status;
2527 struct xhci_virt_device *virt_dev;
2528 union xhci_trb *cmd_trb;
2529
2530 spin_lock_irqsave(&xhci->lock, flags);
2531 virt_dev = xhci->devs[udev->slot_id];
2532
2533 if (command)
2534 in_ctx = command->in_ctx;
2535 else
2536 in_ctx = virt_dev->in_ctx;
2537
2538 if ((xhci->quirks & XHCI_EP_LIMIT_QUIRK) &&
2539 xhci_reserve_host_resources(xhci, in_ctx)) {
2540 spin_unlock_irqrestore(&xhci->lock, flags);
2541 xhci_warn(xhci, "Not enough host resources, "
2542 "active endpoint contexts = %u\n",
2543 xhci->num_active_eps);
2544 return -ENOMEM;
2545 }
2546 if ((xhci->quirks & XHCI_SW_BW_CHECKING) &&
2547 xhci_reserve_bandwidth(xhci, virt_dev, in_ctx)) {
2548 if ((xhci->quirks & XHCI_EP_LIMIT_QUIRK))
2549 xhci_free_host_resources(xhci, in_ctx);
2550 spin_unlock_irqrestore(&xhci->lock, flags);
2551 xhci_warn(xhci, "Not enough bandwidth\n");
2552 return -ENOMEM;
2553 }
2554
2555 if (command) {
2556 cmd_completion = command->completion;
2557 cmd_status = &command->status;
2558 command->command_trb = xhci->cmd_ring->enqueue;
2559
2560 /* Enqueue pointer can be left pointing to the link TRB,
2561 * we must handle that
2562 */
2563 if (TRB_TYPE_LINK_LE32(command->command_trb->link.control))
2564 command->command_trb =
2565 xhci->cmd_ring->enq_seg->next->trbs;
2566
2567 list_add_tail(&command->cmd_list, &virt_dev->cmd_list);
2568 } else {
2569 cmd_completion = &virt_dev->cmd_completion;
2570 cmd_status = &virt_dev->cmd_status;
2571 }
2572 init_completion(cmd_completion);
2573
2574 cmd_trb = xhci->cmd_ring->dequeue;
2575 if (!ctx_change)
2576 ret = xhci_queue_configure_endpoint(xhci, in_ctx->dma,
2577 udev->slot_id, must_succeed);
2578 else
2579 ret = xhci_queue_evaluate_context(xhci, in_ctx->dma,
2580 udev->slot_id, must_succeed);
2581 if (ret < 0) {
2582 if (command)
2583 list_del(&command->cmd_list);
2584 if ((xhci->quirks & XHCI_EP_LIMIT_QUIRK))
2585 xhci_free_host_resources(xhci, in_ctx);
2586 spin_unlock_irqrestore(&xhci->lock, flags);
2587 xhci_dbg(xhci, "FIXME allocate a new ring segment\n");
2588 return -ENOMEM;
2589 }
2590 xhci_ring_cmd_db(xhci);
2591 spin_unlock_irqrestore(&xhci->lock, flags);
2592
2593 /* Wait for the configure endpoint command to complete */
2594 timeleft = wait_for_completion_interruptible_timeout(
2595 cmd_completion,
2596 XHCI_CMD_DEFAULT_TIMEOUT);
2597 if (timeleft <= 0) {
2598 xhci_warn(xhci, "%s while waiting for %s command\n",
2599 timeleft == 0 ? "Timeout" : "Signal",
2600 ctx_change == 0 ?
2601 "configure endpoint" :
2602 "evaluate context");
2603 /* cancel the configure endpoint command */
2604 ret = xhci_cancel_cmd(xhci, command, cmd_trb);
2605 if (ret < 0)
2606 return ret;
2607 return -ETIME;
2608 }
2609
2610 if (!ctx_change)
2611 ret = xhci_configure_endpoint_result(xhci, udev, cmd_status);
2612 else
2613 ret = xhci_evaluate_context_result(xhci, udev, cmd_status);
2614
2615 if ((xhci->quirks & XHCI_EP_LIMIT_QUIRK)) {
2616 spin_lock_irqsave(&xhci->lock, flags);
2617 /* If the command failed, remove the reserved resources.
2618 * Otherwise, clean up the estimate to include dropped eps.
2619 */
2620 if (ret)
2621 xhci_free_host_resources(xhci, in_ctx);
2622 else
2623 xhci_finish_resource_reservation(xhci, in_ctx);
2624 spin_unlock_irqrestore(&xhci->lock, flags);
2625 }
2626 return ret;
2627}
2628
2629/* Called after one or more calls to xhci_add_endpoint() or
2630 * xhci_drop_endpoint(). If this call fails, the USB core is expected
2631 * to call xhci_reset_bandwidth().
2632 *
2633 * Since we are in the middle of changing either configuration or
2634 * installing a new alt setting, the USB core won't allow URBs to be
2635 * enqueued for any endpoint on the old config or interface. Nothing
2636 * else should be touching the xhci->devs[slot_id] structure, so we
2637 * don't need to take the xhci->lock for manipulating that.
2638 */
2639int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
2640{
2641 int i;
2642 int ret = 0;
2643 struct xhci_hcd *xhci;
2644 struct xhci_virt_device *virt_dev;
2645 struct xhci_input_control_ctx *ctrl_ctx;
2646 struct xhci_slot_ctx *slot_ctx;
2647
2648 ret = xhci_check_args(hcd, udev, NULL, 0, true, __func__);
2649 if (ret <= 0)
2650 return ret;
2651 xhci = hcd_to_xhci(hcd);
2652 if (xhci->xhc_state & XHCI_STATE_DYING)
2653 return -ENODEV;
2654
2655 xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
2656 virt_dev = xhci->devs[udev->slot_id];
2657
2658 /* See section 4.6.6 - A0 = 1; A1 = D0 = D1 = 0 */
2659 ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
2660 ctrl_ctx->add_flags |= cpu_to_le32(SLOT_FLAG);
2661 ctrl_ctx->add_flags &= cpu_to_le32(~EP0_FLAG);
2662 ctrl_ctx->drop_flags &= cpu_to_le32(~(SLOT_FLAG | EP0_FLAG));
2663
2664 /* Don't issue the command if there's no endpoints to update. */
2665 if (ctrl_ctx->add_flags == cpu_to_le32(SLOT_FLAG) &&
2666 ctrl_ctx->drop_flags == 0)
2667 return 0;
2668
2669 xhci_dbg(xhci, "New Input Control Context:\n");
2670 slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
2671 xhci_dbg_ctx(xhci, virt_dev->in_ctx,
2672 LAST_CTX_TO_EP_NUM(le32_to_cpu(slot_ctx->dev_info)));
2673
2674 ret = xhci_configure_endpoint(xhci, udev, NULL,
2675 false, false);
2676 if (ret) {
2677 /* Callee should call reset_bandwidth() */
2678 return ret;
2679 }
2680
2681 xhci_dbg(xhci, "Output context after successful config ep cmd:\n");
2682 xhci_dbg_ctx(xhci, virt_dev->out_ctx,
2683 LAST_CTX_TO_EP_NUM(le32_to_cpu(slot_ctx->dev_info)));
2684
2685 /* Free any rings that were dropped, but not changed. */
2686 for (i = 1; i < 31; ++i) {
2687 if ((le32_to_cpu(ctrl_ctx->drop_flags) & (1 << (i + 1))) &&
2688 !(le32_to_cpu(ctrl_ctx->add_flags) & (1 << (i + 1))))
2689 xhci_free_or_cache_endpoint_ring(xhci, virt_dev, i);
2690 }
2691 xhci_zero_in_ctx(xhci, virt_dev);
2692 /*
2693 * Install any rings for completely new endpoints or changed endpoints,
2694 * and free or cache any old rings from changed endpoints.
2695 */
2696 for (i = 1; i < 31; ++i) {
2697 if (!virt_dev->eps[i].new_ring)
2698 continue;
2699 /* Only cache or free the old ring if it exists.
2700 * It may not if this is the first add of an endpoint.
2701 */
2702 if (virt_dev->eps[i].ring) {
2703 xhci_free_or_cache_endpoint_ring(xhci, virt_dev, i);
2704 }
2705 virt_dev->eps[i].ring = virt_dev->eps[i].new_ring;
2706 virt_dev->eps[i].new_ring = NULL;
2707 }
2708
2709 return ret;
2710}
2711
2712void xhci_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
2713{
2714 struct xhci_hcd *xhci;
2715 struct xhci_virt_device *virt_dev;
2716 int i, ret;
2717
2718 ret = xhci_check_args(hcd, udev, NULL, 0, true, __func__);
2719 if (ret <= 0)
2720 return;
2721 xhci = hcd_to_xhci(hcd);
2722
2723 xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
2724 virt_dev = xhci->devs[udev->slot_id];
2725 /* Free any rings allocated for added endpoints */
2726 for (i = 0; i < 31; ++i) {
2727 if (virt_dev->eps[i].new_ring) {
2728 xhci_ring_free(xhci, virt_dev->eps[i].new_ring);
2729 virt_dev->eps[i].new_ring = NULL;
2730 }
2731 }
2732 xhci_zero_in_ctx(xhci, virt_dev);
2733}
2734
2735static void xhci_setup_input_ctx_for_config_ep(struct xhci_hcd *xhci,
2736 struct xhci_container_ctx *in_ctx,
2737 struct xhci_container_ctx *out_ctx,
2738 u32 add_flags, u32 drop_flags)
2739{
2740 struct xhci_input_control_ctx *ctrl_ctx;
2741 ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
2742 ctrl_ctx->add_flags = cpu_to_le32(add_flags);
2743 ctrl_ctx->drop_flags = cpu_to_le32(drop_flags);
2744 xhci_slot_copy(xhci, in_ctx, out_ctx);
2745 ctrl_ctx->add_flags |= cpu_to_le32(SLOT_FLAG);
2746
2747 xhci_dbg(xhci, "Input Context:\n");
2748 xhci_dbg_ctx(xhci, in_ctx, xhci_last_valid_endpoint(add_flags));
2749}
2750
2751static void xhci_setup_input_ctx_for_quirk(struct xhci_hcd *xhci,
2752 unsigned int slot_id, unsigned int ep_index,
2753 struct xhci_dequeue_state *deq_state)
2754{
2755 struct xhci_container_ctx *in_ctx;
2756 struct xhci_ep_ctx *ep_ctx;
2757 u32 added_ctxs;
2758 dma_addr_t addr;
2759
2760 xhci_endpoint_copy(xhci, xhci->devs[slot_id]->in_ctx,
2761 xhci->devs[slot_id]->out_ctx, ep_index);
2762 in_ctx = xhci->devs[slot_id]->in_ctx;
2763 ep_ctx = xhci_get_ep_ctx(xhci, in_ctx, ep_index);
2764 addr = xhci_trb_virt_to_dma(deq_state->new_deq_seg,
2765 deq_state->new_deq_ptr);
2766 if (addr == 0) {
2767 xhci_warn(xhci, "WARN Cannot submit config ep after "
2768 "reset ep command\n");
2769 xhci_warn(xhci, "WARN deq seg = %p, deq ptr = %p\n",
2770 deq_state->new_deq_seg,
2771 deq_state->new_deq_ptr);
2772 return;
2773 }
2774 ep_ctx->deq = cpu_to_le64(addr | deq_state->new_cycle_state);
2775
2776 added_ctxs = xhci_get_endpoint_flag_from_index(ep_index);
2777 xhci_setup_input_ctx_for_config_ep(xhci, xhci->devs[slot_id]->in_ctx,
2778 xhci->devs[slot_id]->out_ctx, added_ctxs, added_ctxs);
2779}
2780
2781void xhci_cleanup_stalled_ring(struct xhci_hcd *xhci,
2782 struct usb_device *udev, unsigned int ep_index)
2783{
2784 struct xhci_dequeue_state deq_state;
2785 struct xhci_virt_ep *ep;
2786
2787 xhci_dbg(xhci, "Cleaning up stalled endpoint ring\n");
2788 ep = &xhci->devs[udev->slot_id]->eps[ep_index];
2789 /* We need to move the HW's dequeue pointer past this TD,
2790 * or it will attempt to resend it on the next doorbell ring.
2791 */
2792 xhci_find_new_dequeue_state(xhci, udev->slot_id,
2793 ep_index, ep->stopped_stream, ep->stopped_td,
2794 &deq_state);
2795
2796 /* HW with the reset endpoint quirk will use the saved dequeue state to
2797 * issue a configure endpoint command later.
2798 */
2799 if (!(xhci->quirks & XHCI_RESET_EP_QUIRK)) {
2800 xhci_dbg(xhci, "Queueing new dequeue state\n");
2801 xhci_queue_new_dequeue_state(xhci, udev->slot_id,
2802 ep_index, ep->stopped_stream, &deq_state);
2803 } else {
2804 /* Better hope no one uses the input context between now and the
2805 * reset endpoint completion!
2806 * XXX: No idea how this hardware will react when stream rings
2807 * are enabled.
2808 */
2809 xhci_dbg(xhci, "Setting up input context for "
2810 "configure endpoint command\n");
2811 xhci_setup_input_ctx_for_quirk(xhci, udev->slot_id,
2812 ep_index, &deq_state);
2813 }
2814}
2815
2816/* Deal with stalled endpoints. The core should have sent the control message
2817 * to clear the halt condition. However, we need to make the xHCI hardware
2818 * reset its sequence number, since a device will expect a sequence number of
2819 * zero after the halt condition is cleared.
2820 * Context: in_interrupt
2821 */
2822void xhci_endpoint_reset(struct usb_hcd *hcd,
2823 struct usb_host_endpoint *ep)
2824{
2825 struct xhci_hcd *xhci;
2826 struct usb_device *udev;
2827 unsigned int ep_index;
2828 unsigned long flags;
2829 int ret;
2830 struct xhci_virt_ep *virt_ep;
2831
2832 xhci = hcd_to_xhci(hcd);
2833 udev = (struct usb_device *) ep->hcpriv;
2834 /* Called with a root hub endpoint (or an endpoint that wasn't added
2835 * with xhci_add_endpoint()
2836 */
2837 if (!ep->hcpriv)
2838 return;
2839 ep_index = xhci_get_endpoint_index(&ep->desc);
2840 virt_ep = &xhci->devs[udev->slot_id]->eps[ep_index];
2841 if (!virt_ep->stopped_td) {
2842 xhci_dbg(xhci, "Endpoint 0x%x not halted, refusing to reset.\n",
2843 ep->desc.bEndpointAddress);
2844 return;
2845 }
2846 if (usb_endpoint_xfer_control(&ep->desc)) {
2847 xhci_dbg(xhci, "Control endpoint stall already handled.\n");
2848 return;
2849 }
2850
2851 xhci_dbg(xhci, "Queueing reset endpoint command\n");
2852 spin_lock_irqsave(&xhci->lock, flags);
2853 ret = xhci_queue_reset_ep(xhci, udev->slot_id, ep_index);
2854 /*
2855 * Can't change the ring dequeue pointer until it's transitioned to the
2856 * stopped state, which is only upon a successful reset endpoint
2857 * command. Better hope that last command worked!
2858 */
2859 if (!ret) {
2860 xhci_cleanup_stalled_ring(xhci, udev, ep_index);
2861 kfree(virt_ep->stopped_td);
2862 xhci_ring_cmd_db(xhci);
2863 }
2864 virt_ep->stopped_td = NULL;
2865 virt_ep->stopped_trb = NULL;
2866 virt_ep->stopped_stream = 0;
2867 spin_unlock_irqrestore(&xhci->lock, flags);
2868
2869 if (ret)
2870 xhci_warn(xhci, "FIXME allocate a new ring segment\n");
2871}
2872
2873static int xhci_check_streams_endpoint(struct xhci_hcd *xhci,
2874 struct usb_device *udev, struct usb_host_endpoint *ep,
2875 unsigned int slot_id)
2876{
2877 int ret;
2878 unsigned int ep_index;
2879 unsigned int ep_state;
2880
2881 if (!ep)
2882 return -EINVAL;
2883 ret = xhci_check_args(xhci_to_hcd(xhci), udev, ep, 1, true, __func__);
2884 if (ret <= 0)
2885 return -EINVAL;
2886 if (ep->ss_ep_comp.bmAttributes == 0) {
2887 xhci_warn(xhci, "WARN: SuperSpeed Endpoint Companion"
2888 " descriptor for ep 0x%x does not support streams\n",
2889 ep->desc.bEndpointAddress);
2890 return -EINVAL;
2891 }
2892
2893 ep_index = xhci_get_endpoint_index(&ep->desc);
2894 ep_state = xhci->devs[slot_id]->eps[ep_index].ep_state;
2895 if (ep_state & EP_HAS_STREAMS ||
2896 ep_state & EP_GETTING_STREAMS) {
2897 xhci_warn(xhci, "WARN: SuperSpeed bulk endpoint 0x%x "
2898 "already has streams set up.\n",
2899 ep->desc.bEndpointAddress);
2900 xhci_warn(xhci, "Send email to xHCI maintainer and ask for "
2901 "dynamic stream context array reallocation.\n");
2902 return -EINVAL;
2903 }
2904 if (!list_empty(&xhci->devs[slot_id]->eps[ep_index].ring->td_list)) {
2905 xhci_warn(xhci, "Cannot setup streams for SuperSpeed bulk "
2906 "endpoint 0x%x; URBs are pending.\n",
2907 ep->desc.bEndpointAddress);
2908 return -EINVAL;
2909 }
2910 return 0;
2911}
2912
2913static void xhci_calculate_streams_entries(struct xhci_hcd *xhci,
2914 unsigned int *num_streams, unsigned int *num_stream_ctxs)
2915{
2916 unsigned int max_streams;
2917
2918 /* The stream context array size must be a power of two */
2919 *num_stream_ctxs = roundup_pow_of_two(*num_streams);
2920 /*
2921 * Find out how many primary stream array entries the host controller
2922 * supports. Later we may use secondary stream arrays (similar to 2nd
2923 * level page entries), but that's an optional feature for xHCI host
2924 * controllers. xHCs must support at least 4 stream IDs.
2925 */
2926 max_streams = HCC_MAX_PSA(xhci->hcc_params);
2927 if (*num_stream_ctxs > max_streams) {
2928 xhci_dbg(xhci, "xHCI HW only supports %u stream ctx entries.\n",
2929 max_streams);
2930 *num_stream_ctxs = max_streams;
2931 *num_streams = max_streams;
2932 }
2933}
2934
2935/* Returns an error code if one of the endpoint already has streams.
2936 * This does not change any data structures, it only checks and gathers
2937 * information.
2938 */
2939static int xhci_calculate_streams_and_bitmask(struct xhci_hcd *xhci,
2940 struct usb_device *udev,
2941 struct usb_host_endpoint **eps, unsigned int num_eps,
2942 unsigned int *num_streams, u32 *changed_ep_bitmask)
2943{
2944 unsigned int max_streams;
2945 unsigned int endpoint_flag;
2946 int i;
2947 int ret;
2948
2949 for (i = 0; i < num_eps; i++) {
2950 ret = xhci_check_streams_endpoint(xhci, udev,
2951 eps[i], udev->slot_id);
2952 if (ret < 0)
2953 return ret;
2954
2955 max_streams = usb_ss_max_streams(&eps[i]->ss_ep_comp);
2956 if (max_streams < (*num_streams - 1)) {
2957 xhci_dbg(xhci, "Ep 0x%x only supports %u stream IDs.\n",
2958 eps[i]->desc.bEndpointAddress,
2959 max_streams);
2960 *num_streams = max_streams+1;
2961 }
2962
2963 endpoint_flag = xhci_get_endpoint_flag(&eps[i]->desc);
2964 if (*changed_ep_bitmask & endpoint_flag)
2965 return -EINVAL;
2966 *changed_ep_bitmask |= endpoint_flag;
2967 }
2968 return 0;
2969}
2970
2971static u32 xhci_calculate_no_streams_bitmask(struct xhci_hcd *xhci,
2972 struct usb_device *udev,
2973 struct usb_host_endpoint **eps, unsigned int num_eps)
2974{
2975 u32 changed_ep_bitmask = 0;
2976 unsigned int slot_id;
2977 unsigned int ep_index;
2978 unsigned int ep_state;
2979 int i;
2980
2981 slot_id = udev->slot_id;
2982 if (!xhci->devs[slot_id])
2983 return 0;
2984
2985 for (i = 0; i < num_eps; i++) {
2986 ep_index = xhci_get_endpoint_index(&eps[i]->desc);
2987 ep_state = xhci->devs[slot_id]->eps[ep_index].ep_state;
2988 /* Are streams already being freed for the endpoint? */
2989 if (ep_state & EP_GETTING_NO_STREAMS) {
2990 xhci_warn(xhci, "WARN Can't disable streams for "
2991 "endpoint 0x%x\n, "
2992 "streams are being disabled already.",
2993 eps[i]->desc.bEndpointAddress);
2994 return 0;
2995 }
2996 /* Are there actually any streams to free? */
2997 if (!(ep_state & EP_HAS_STREAMS) &&
2998 !(ep_state & EP_GETTING_STREAMS)) {
2999 xhci_warn(xhci, "WARN Can't disable streams for "
3000 "endpoint 0x%x\n, "
3001 "streams are already disabled!",
3002 eps[i]->desc.bEndpointAddress);
3003 xhci_warn(xhci, "WARN xhci_free_streams() called "
3004 "with non-streams endpoint\n");
3005 return 0;
3006 }
3007 changed_ep_bitmask |= xhci_get_endpoint_flag(&eps[i]->desc);
3008 }
3009 return changed_ep_bitmask;
3010}
3011
3012/*
3013 * The USB device drivers use this function (though the HCD interface in USB
3014 * core) to prepare a set of bulk endpoints to use streams. Streams are used to
3015 * coordinate mass storage command queueing across multiple endpoints (basically
3016 * a stream ID == a task ID).
3017 *
3018 * Setting up streams involves allocating the same size stream context array
3019 * for each endpoint and issuing a configure endpoint command for all endpoints.
3020 *
3021 * Don't allow the call to succeed if one endpoint only supports one stream
3022 * (which means it doesn't support streams at all).
3023 *
3024 * Drivers may get less stream IDs than they asked for, if the host controller
3025 * hardware or endpoints claim they can't support the number of requested
3026 * stream IDs.
3027 */
3028int xhci_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
3029 struct usb_host_endpoint **eps, unsigned int num_eps,
3030 unsigned int num_streams, gfp_t mem_flags)
3031{
3032 int i, ret;
3033 struct xhci_hcd *xhci;
3034 struct xhci_virt_device *vdev;
3035 struct xhci_command *config_cmd;
3036 unsigned int ep_index;
3037 unsigned int num_stream_ctxs;
3038 unsigned long flags;
3039 u32 changed_ep_bitmask = 0;
3040
3041 if (!eps)
3042 return -EINVAL;
3043
3044 /* Add one to the number of streams requested to account for
3045 * stream 0 that is reserved for xHCI usage.
3046 */
3047 num_streams += 1;
3048 xhci = hcd_to_xhci(hcd);
3049 xhci_dbg(xhci, "Driver wants %u stream IDs (including stream 0).\n",
3050 num_streams);
3051
3052 config_cmd = xhci_alloc_command(xhci, true, true, mem_flags);
3053 if (!config_cmd) {
3054 xhci_dbg(xhci, "Could not allocate xHCI command structure.\n");
3055 return -ENOMEM;
3056 }
3057
3058 /* Check to make sure all endpoints are not already configured for
3059 * streams. While we're at it, find the maximum number of streams that
3060 * all the endpoints will support and check for duplicate endpoints.
3061 */
3062 spin_lock_irqsave(&xhci->lock, flags);
3063 ret = xhci_calculate_streams_and_bitmask(xhci, udev, eps,
3064 num_eps, &num_streams, &changed_ep_bitmask);
3065 if (ret < 0) {
3066 xhci_free_command(xhci, config_cmd);
3067 spin_unlock_irqrestore(&xhci->lock, flags);
3068 return ret;
3069 }
3070 if (num_streams <= 1) {
3071 xhci_warn(xhci, "WARN: endpoints can't handle "
3072 "more than one stream.\n");
3073 xhci_free_command(xhci, config_cmd);
3074 spin_unlock_irqrestore(&xhci->lock, flags);
3075 return -EINVAL;
3076 }
3077 vdev = xhci->devs[udev->slot_id];
3078 /* Mark each endpoint as being in transition, so
3079 * xhci_urb_enqueue() will reject all URBs.
3080 */
3081 for (i = 0; i < num_eps; i++) {
3082 ep_index = xhci_get_endpoint_index(&eps[i]->desc);
3083 vdev->eps[ep_index].ep_state |= EP_GETTING_STREAMS;
3084 }
3085 spin_unlock_irqrestore(&xhci->lock, flags);
3086
3087 /* Setup internal data structures and allocate HW data structures for
3088 * streams (but don't install the HW structures in the input context
3089 * until we're sure all memory allocation succeeded).
3090 */
3091 xhci_calculate_streams_entries(xhci, &num_streams, &num_stream_ctxs);
3092 xhci_dbg(xhci, "Need %u stream ctx entries for %u stream IDs.\n",
3093 num_stream_ctxs, num_streams);
3094
3095 for (i = 0; i < num_eps; i++) {
3096 ep_index = xhci_get_endpoint_index(&eps[i]->desc);
3097 vdev->eps[ep_index].stream_info = xhci_alloc_stream_info(xhci,
3098 num_stream_ctxs,
3099 num_streams, mem_flags);
3100 if (!vdev->eps[ep_index].stream_info)
3101 goto cleanup;
3102 /* Set maxPstreams in endpoint context and update deq ptr to
3103 * point to stream context array. FIXME
3104 */
3105 }
3106
3107 /* Set up the input context for a configure endpoint command. */
3108 for (i = 0; i < num_eps; i++) {
3109 struct xhci_ep_ctx *ep_ctx;
3110
3111 ep_index = xhci_get_endpoint_index(&eps[i]->desc);
3112 ep_ctx = xhci_get_ep_ctx(xhci, config_cmd->in_ctx, ep_index);
3113
3114 xhci_endpoint_copy(xhci, config_cmd->in_ctx,
3115 vdev->out_ctx, ep_index);
3116 xhci_setup_streams_ep_input_ctx(xhci, ep_ctx,
3117 vdev->eps[ep_index].stream_info);
3118 }
3119 /* Tell the HW to drop its old copy of the endpoint context info
3120 * and add the updated copy from the input context.
3121 */
3122 xhci_setup_input_ctx_for_config_ep(xhci, config_cmd->in_ctx,
3123 vdev->out_ctx, changed_ep_bitmask, changed_ep_bitmask);
3124
3125 /* Issue and wait for the configure endpoint command */
3126 ret = xhci_configure_endpoint(xhci, udev, config_cmd,
3127 false, false);
3128
3129 /* xHC rejected the configure endpoint command for some reason, so we
3130 * leave the old ring intact and free our internal streams data
3131 * structure.
3132 */
3133 if (ret < 0)
3134 goto cleanup;
3135
3136 spin_lock_irqsave(&xhci->lock, flags);
3137 for (i = 0; i < num_eps; i++) {
3138 ep_index = xhci_get_endpoint_index(&eps[i]->desc);
3139 vdev->eps[ep_index].ep_state &= ~EP_GETTING_STREAMS;
3140 xhci_dbg(xhci, "Slot %u ep ctx %u now has streams.\n",
3141 udev->slot_id, ep_index);
3142 vdev->eps[ep_index].ep_state |= EP_HAS_STREAMS;
3143 }
3144 xhci_free_command(xhci, config_cmd);
3145 spin_unlock_irqrestore(&xhci->lock, flags);
3146
3147 /* Subtract 1 for stream 0, which drivers can't use */
3148 return num_streams - 1;
3149
3150cleanup:
3151 /* If it didn't work, free the streams! */
3152 for (i = 0; i < num_eps; i++) {
3153 ep_index = xhci_get_endpoint_index(&eps[i]->desc);
3154 xhci_free_stream_info(xhci, vdev->eps[ep_index].stream_info);
3155 vdev->eps[ep_index].stream_info = NULL;
3156 /* FIXME Unset maxPstreams in endpoint context and
3157 * update deq ptr to point to normal string ring.
3158 */
3159 vdev->eps[ep_index].ep_state &= ~EP_GETTING_STREAMS;
3160 vdev->eps[ep_index].ep_state &= ~EP_HAS_STREAMS;
3161 xhci_endpoint_zero(xhci, vdev, eps[i]);
3162 }
3163 xhci_free_command(xhci, config_cmd);
3164 return -ENOMEM;
3165}
3166
3167/* Transition the endpoint from using streams to being a "normal" endpoint
3168 * without streams.
3169 *
3170 * Modify the endpoint context state, submit a configure endpoint command,
3171 * and free all endpoint rings for streams if that completes successfully.
3172 */
3173int xhci_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
3174 struct usb_host_endpoint **eps, unsigned int num_eps,
3175 gfp_t mem_flags)
3176{
3177 int i, ret;
3178 struct xhci_hcd *xhci;
3179 struct xhci_virt_device *vdev;
3180 struct xhci_command *command;
3181 unsigned int ep_index;
3182 unsigned long flags;
3183 u32 changed_ep_bitmask;
3184
3185 xhci = hcd_to_xhci(hcd);
3186 vdev = xhci->devs[udev->slot_id];
3187
3188 /* Set up a configure endpoint command to remove the streams rings */
3189 spin_lock_irqsave(&xhci->lock, flags);
3190 changed_ep_bitmask = xhci_calculate_no_streams_bitmask(xhci,
3191 udev, eps, num_eps);
3192 if (changed_ep_bitmask == 0) {
3193 spin_unlock_irqrestore(&xhci->lock, flags);
3194 return -EINVAL;
3195 }
3196
3197 /* Use the xhci_command structure from the first endpoint. We may have
3198 * allocated too many, but the driver may call xhci_free_streams() for
3199 * each endpoint it grouped into one call to xhci_alloc_streams().
3200 */
3201 ep_index = xhci_get_endpoint_index(&eps[0]->desc);
3202 command = vdev->eps[ep_index].stream_info->free_streams_command;
3203 for (i = 0; i < num_eps; i++) {
3204 struct xhci_ep_ctx *ep_ctx;
3205
3206 ep_index = xhci_get_endpoint_index(&eps[i]->desc);
3207 ep_ctx = xhci_get_ep_ctx(xhci, command->in_ctx, ep_index);
3208 xhci->devs[udev->slot_id]->eps[ep_index].ep_state |=
3209 EP_GETTING_NO_STREAMS;
3210
3211 xhci_endpoint_copy(xhci, command->in_ctx,
3212 vdev->out_ctx, ep_index);
3213 xhci_setup_no_streams_ep_input_ctx(xhci, ep_ctx,
3214 &vdev->eps[ep_index]);
3215 }
3216 xhci_setup_input_ctx_for_config_ep(xhci, command->in_ctx,
3217 vdev->out_ctx, changed_ep_bitmask, changed_ep_bitmask);
3218 spin_unlock_irqrestore(&xhci->lock, flags);
3219
3220 /* Issue and wait for the configure endpoint command,
3221 * which must succeed.
3222 */
3223 ret = xhci_configure_endpoint(xhci, udev, command,
3224 false, true);
3225
3226 /* xHC rejected the configure endpoint command for some reason, so we
3227 * leave the streams rings intact.
3228 */
3229 if (ret < 0)
3230 return ret;
3231
3232 spin_lock_irqsave(&xhci->lock, flags);
3233 for (i = 0; i < num_eps; i++) {
3234 ep_index = xhci_get_endpoint_index(&eps[i]->desc);
3235 xhci_free_stream_info(xhci, vdev->eps[ep_index].stream_info);
3236 vdev->eps[ep_index].stream_info = NULL;
3237 /* FIXME Unset maxPstreams in endpoint context and
3238 * update deq ptr to point to normal string ring.
3239 */
3240 vdev->eps[ep_index].ep_state &= ~EP_GETTING_NO_STREAMS;
3241 vdev->eps[ep_index].ep_state &= ~EP_HAS_STREAMS;
3242 }
3243 spin_unlock_irqrestore(&xhci->lock, flags);
3244
3245 return 0;
3246}
3247
3248/*
3249 * Deletes endpoint resources for endpoints that were active before a Reset
3250 * Device command, or a Disable Slot command. The Reset Device command leaves
3251 * the control endpoint intact, whereas the Disable Slot command deletes it.
3252 *
3253 * Must be called with xhci->lock held.
3254 */
3255void xhci_free_device_endpoint_resources(struct xhci_hcd *xhci,
3256 struct xhci_virt_device *virt_dev, bool drop_control_ep)
3257{
3258 int i;
3259 unsigned int num_dropped_eps = 0;
3260 unsigned int drop_flags = 0;
3261
3262 for (i = (drop_control_ep ? 0 : 1); i < 31; i++) {
3263 if (virt_dev->eps[i].ring) {
3264 drop_flags |= 1 << i;
3265 num_dropped_eps++;
3266 }
3267 }
3268 xhci->num_active_eps -= num_dropped_eps;
3269 if (num_dropped_eps)
3270 xhci_dbg(xhci, "Dropped %u ep ctxs, flags = 0x%x, "
3271 "%u now active.\n",
3272 num_dropped_eps, drop_flags,
3273 xhci->num_active_eps);
3274}
3275
3276/*
3277 * This submits a Reset Device Command, which will set the device state to 0,
3278 * set the device address to 0, and disable all the endpoints except the default
3279 * control endpoint. The USB core should come back and call
3280 * xhci_address_device(), and then re-set up the configuration. If this is
3281 * called because of a usb_reset_and_verify_device(), then the old alternate
3282 * settings will be re-installed through the normal bandwidth allocation
3283 * functions.
3284 *
3285 * Wait for the Reset Device command to finish. Remove all structures
3286 * associated with the endpoints that were disabled. Clear the input device
3287 * structure? Cache the rings? Reset the control endpoint 0 max packet size?
3288 *
3289 * If the virt_dev to be reset does not exist or does not match the udev,
3290 * it means the device is lost, possibly due to the xHC restore error and
3291 * re-initialization during S3/S4. In this case, call xhci_alloc_dev() to
3292 * re-allocate the device.
3293 */
3294int xhci_discover_or_reset_device(struct usb_hcd *hcd, struct usb_device *udev)
3295{
3296 int ret, i;
3297 unsigned long flags;
3298 struct xhci_hcd *xhci;
3299 unsigned int slot_id;
3300 struct xhci_virt_device *virt_dev;
3301 struct xhci_command *reset_device_cmd;
3302 int timeleft;
3303 int last_freed_endpoint;
3304 struct xhci_slot_ctx *slot_ctx;
3305 int old_active_eps = 0;
3306
3307 ret = xhci_check_args(hcd, udev, NULL, 0, false, __func__);
3308 if (ret <= 0)
3309 return ret;
3310 xhci = hcd_to_xhci(hcd);
3311 slot_id = udev->slot_id;
3312 virt_dev = xhci->devs[slot_id];
3313 if (!virt_dev) {
3314 xhci_dbg(xhci, "The device to be reset with slot ID %u does "
3315 "not exist. Re-allocate the device\n", slot_id);
3316 ret = xhci_alloc_dev(hcd, udev);
3317 if (ret == 1)
3318 return 0;
3319 else
3320 return -EINVAL;
3321 }
3322
3323 if (virt_dev->udev != udev) {
3324 /* If the virt_dev and the udev does not match, this virt_dev
3325 * may belong to another udev.
3326 * Re-allocate the device.
3327 */
3328 xhci_dbg(xhci, "The device to be reset with slot ID %u does "
3329 "not match the udev. Re-allocate the device\n",
3330 slot_id);
3331 ret = xhci_alloc_dev(hcd, udev);
3332 if (ret == 1)
3333 return 0;
3334 else
3335 return -EINVAL;
3336 }
3337
3338 /* If device is not setup, there is no point in resetting it */
3339 slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->out_ctx);
3340 if (GET_SLOT_STATE(le32_to_cpu(slot_ctx->dev_state)) ==
3341 SLOT_STATE_DISABLED)
3342 return 0;
3343
3344 xhci_dbg(xhci, "Resetting device with slot ID %u\n", slot_id);
3345 /* Allocate the command structure that holds the struct completion.
3346 * Assume we're in process context, since the normal device reset
3347 * process has to wait for the device anyway. Storage devices are
3348 * reset as part of error handling, so use GFP_NOIO instead of
3349 * GFP_KERNEL.
3350 */
3351 reset_device_cmd = xhci_alloc_command(xhci, false, true, GFP_NOIO);
3352 if (!reset_device_cmd) {
3353 xhci_dbg(xhci, "Couldn't allocate command structure.\n");
3354 return -ENOMEM;
3355 }
3356
3357 /* Attempt to submit the Reset Device command to the command ring */
3358 spin_lock_irqsave(&xhci->lock, flags);
3359 reset_device_cmd->command_trb = xhci->cmd_ring->enqueue;
3360
3361 /* Enqueue pointer can be left pointing to the link TRB,
3362 * we must handle that
3363 */
3364 if (TRB_TYPE_LINK_LE32(reset_device_cmd->command_trb->link.control))
3365 reset_device_cmd->command_trb =
3366 xhci->cmd_ring->enq_seg->next->trbs;
3367
3368 list_add_tail(&reset_device_cmd->cmd_list, &virt_dev->cmd_list);
3369 ret = xhci_queue_reset_device(xhci, slot_id);
3370 if (ret) {
3371 xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
3372 list_del(&reset_device_cmd->cmd_list);
3373 spin_unlock_irqrestore(&xhci->lock, flags);
3374 goto command_cleanup;
3375 }
3376 xhci_ring_cmd_db(xhci);
3377 spin_unlock_irqrestore(&xhci->lock, flags);
3378
3379 /* Wait for the Reset Device command to finish */
3380 timeleft = wait_for_completion_interruptible_timeout(
3381 reset_device_cmd->completion,
3382 USB_CTRL_SET_TIMEOUT);
3383 if (timeleft <= 0) {
3384 xhci_warn(xhci, "%s while waiting for reset device command\n",
3385 timeleft == 0 ? "Timeout" : "Signal");
3386 spin_lock_irqsave(&xhci->lock, flags);
3387 /* The timeout might have raced with the event ring handler, so
3388 * only delete from the list if the item isn't poisoned.
3389 */
3390 if (reset_device_cmd->cmd_list.next != LIST_POISON1)
3391 list_del(&reset_device_cmd->cmd_list);
3392 spin_unlock_irqrestore(&xhci->lock, flags);
3393 ret = -ETIME;
3394 goto command_cleanup;
3395 }
3396
3397 /* The Reset Device command can't fail, according to the 0.95/0.96 spec,
3398 * unless we tried to reset a slot ID that wasn't enabled,
3399 * or the device wasn't in the addressed or configured state.
3400 */
3401 ret = reset_device_cmd->status;
3402 switch (ret) {
3403 case COMP_EBADSLT: /* 0.95 completion code for bad slot ID */
3404 case COMP_CTX_STATE: /* 0.96 completion code for same thing */
3405 xhci_info(xhci, "Can't reset device (slot ID %u) in %s state\n",
3406 slot_id,
3407 xhci_get_slot_state(xhci, virt_dev->out_ctx));
3408 xhci_info(xhci, "Not freeing device rings.\n");
3409 /* Don't treat this as an error. May change my mind later. */
3410 ret = 0;
3411 goto command_cleanup;
3412 case COMP_SUCCESS:
3413 xhci_dbg(xhci, "Successful reset device command.\n");
3414 break;
3415 default:
3416 if (xhci_is_vendor_info_code(xhci, ret))
3417 break;
3418 xhci_warn(xhci, "Unknown completion code %u for "
3419 "reset device command.\n", ret);
3420 ret = -EINVAL;
3421 goto command_cleanup;
3422 }
3423
3424 /* Free up host controller endpoint resources */
3425 if ((xhci->quirks & XHCI_EP_LIMIT_QUIRK)) {
3426 spin_lock_irqsave(&xhci->lock, flags);
3427 /* Don't delete the default control endpoint resources */
3428 xhci_free_device_endpoint_resources(xhci, virt_dev, false);
3429 spin_unlock_irqrestore(&xhci->lock, flags);
3430 }
3431
3432 /* Everything but endpoint 0 is disabled, so free or cache the rings. */
3433 last_freed_endpoint = 1;
3434 for (i = 1; i < 31; ++i) {
3435 struct xhci_virt_ep *ep = &virt_dev->eps[i];
3436
3437 if (ep->ep_state & EP_HAS_STREAMS) {
3438 xhci_free_stream_info(xhci, ep->stream_info);
3439 ep->stream_info = NULL;
3440 ep->ep_state &= ~EP_HAS_STREAMS;
3441 }
3442
3443 if (ep->ring) {
3444 xhci_free_or_cache_endpoint_ring(xhci, virt_dev, i);
3445 last_freed_endpoint = i;
3446 }
3447 if (!list_empty(&virt_dev->eps[i].bw_endpoint_list))
3448 xhci_drop_ep_from_interval_table(xhci,
3449 &virt_dev->eps[i].bw_info,
3450 virt_dev->bw_table,
3451 udev,
3452 &virt_dev->eps[i],
3453 virt_dev->tt_info);
3454 xhci_clear_endpoint_bw_info(&virt_dev->eps[i].bw_info);
3455 }
3456 /* If necessary, update the number of active TTs on this root port */
3457 xhci_update_tt_active_eps(xhci, virt_dev, old_active_eps);
3458
3459 xhci_dbg(xhci, "Output context after successful reset device cmd:\n");
3460 xhci_dbg_ctx(xhci, virt_dev->out_ctx, last_freed_endpoint);
3461 ret = 0;
3462
3463command_cleanup:
3464 xhci_free_command(xhci, reset_device_cmd);
3465 return ret;
3466}
3467
3468/*
3469 * At this point, the struct usb_device is about to go away, the device has
3470 * disconnected, and all traffic has been stopped and the endpoints have been
3471 * disabled. Free any HC data structures associated with that device.
3472 */
3473void xhci_free_dev(struct usb_hcd *hcd, struct usb_device *udev)
3474{
3475 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
3476 struct xhci_virt_device *virt_dev;
3477 unsigned long flags;
3478 u32 state;
3479 int i, ret;
3480
3481 ret = xhci_check_args(hcd, udev, NULL, 0, true, __func__);
3482 /* If the host is halted due to driver unload, we still need to free the
3483 * device.
3484 */
3485 if (ret <= 0 && ret != -ENODEV)
3486 return;
3487
3488 virt_dev = xhci->devs[udev->slot_id];
3489
3490 /* Stop any wayward timer functions (which may grab the lock) */
3491 for (i = 0; i < 31; ++i) {
3492 virt_dev->eps[i].ep_state &= ~EP_HALT_PENDING;
3493 del_timer_sync(&virt_dev->eps[i].stop_cmd_timer);
3494 }
3495
3496 if (udev->usb2_hw_lpm_enabled) {
3497 xhci_set_usb2_hardware_lpm(hcd, udev, 0);
3498 udev->usb2_hw_lpm_enabled = 0;
3499 }
3500
3501 spin_lock_irqsave(&xhci->lock, flags);
3502 /* Don't disable the slot if the host controller is dead. */
3503 state = xhci_readl(xhci, &xhci->op_regs->status);
3504 if (state == 0xffffffff || (xhci->xhc_state & XHCI_STATE_DYING) ||
3505 (xhci->xhc_state & XHCI_STATE_HALTED)) {
3506 xhci_free_virt_device(xhci, udev->slot_id);
3507 spin_unlock_irqrestore(&xhci->lock, flags);
3508 return;
3509 }
3510
3511 if (xhci_queue_slot_control(xhci, TRB_DISABLE_SLOT, udev->slot_id)) {
3512 spin_unlock_irqrestore(&xhci->lock, flags);
3513 xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
3514 return;
3515 }
3516 xhci_ring_cmd_db(xhci);
3517 spin_unlock_irqrestore(&xhci->lock, flags);
3518 /*
3519 * Event command completion handler will free any data structures
3520 * associated with the slot. XXX Can free sleep?
3521 */
3522}
3523
3524/*
3525 * Checks if we have enough host controller resources for the default control
3526 * endpoint.
3527 *
3528 * Must be called with xhci->lock held.
3529 */
3530static int xhci_reserve_host_control_ep_resources(struct xhci_hcd *xhci)
3531{
3532 if (xhci->num_active_eps + 1 > xhci->limit_active_eps) {
3533 xhci_dbg(xhci, "Not enough ep ctxs: "
3534 "%u active, need to add 1, limit is %u.\n",
3535 xhci->num_active_eps, xhci->limit_active_eps);
3536 return -ENOMEM;
3537 }
3538 xhci->num_active_eps += 1;
3539 xhci_dbg(xhci, "Adding 1 ep ctx, %u now active.\n",
3540 xhci->num_active_eps);
3541 return 0;
3542}
3543
3544
3545/*
3546 * Returns 0 if the xHC ran out of device slots, the Enable Slot command
3547 * timed out, or allocating memory failed. Returns 1 on success.
3548 */
3549int xhci_alloc_dev(struct usb_hcd *hcd, struct usb_device *udev)
3550{
3551 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
3552 unsigned long flags;
3553 int timeleft;
3554 int ret;
3555 union xhci_trb *cmd_trb;
3556
3557 spin_lock_irqsave(&xhci->lock, flags);
3558 cmd_trb = xhci->cmd_ring->dequeue;
3559 ret = xhci_queue_slot_control(xhci, TRB_ENABLE_SLOT, 0);
3560 if (ret) {
3561 spin_unlock_irqrestore(&xhci->lock, flags);
3562 xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
3563 return 0;
3564 }
3565 xhci_ring_cmd_db(xhci);
3566 spin_unlock_irqrestore(&xhci->lock, flags);
3567
3568 /* XXX: how much time for xHC slot assignment? */
3569 timeleft = wait_for_completion_interruptible_timeout(&xhci->addr_dev,
3570 XHCI_CMD_DEFAULT_TIMEOUT);
3571 if (timeleft <= 0) {
3572 xhci_warn(xhci, "%s while waiting for a slot\n",
3573 timeleft == 0 ? "Timeout" : "Signal");
3574 /* cancel the enable slot request */
3575 return xhci_cancel_cmd(xhci, NULL, cmd_trb);
3576 }
3577
3578 if (!xhci->slot_id) {
3579 xhci_err(xhci, "Error while assigning device slot ID\n");
3580 return 0;
3581 }
3582
3583 if ((xhci->quirks & XHCI_EP_LIMIT_QUIRK)) {
3584 spin_lock_irqsave(&xhci->lock, flags);
3585 ret = xhci_reserve_host_control_ep_resources(xhci);
3586 if (ret) {
3587 spin_unlock_irqrestore(&xhci->lock, flags);
3588 xhci_warn(xhci, "Not enough host resources, "
3589 "active endpoint contexts = %u\n",
3590 xhci->num_active_eps);
3591 goto disable_slot;
3592 }
3593 spin_unlock_irqrestore(&xhci->lock, flags);
3594 }
3595 /* Use GFP_NOIO, since this function can be called from
3596 * xhci_discover_or_reset_device(), which may be called as part of
3597 * mass storage driver error handling.
3598 */
3599 if (!xhci_alloc_virt_device(xhci, xhci->slot_id, udev, GFP_NOIO)) {
3600 xhci_warn(xhci, "Could not allocate xHCI USB device data structures\n");
3601 goto disable_slot;
3602 }
3603 udev->slot_id = xhci->slot_id;
3604 /* Is this a LS or FS device under a HS hub? */
3605 /* Hub or peripherial? */
3606 return 1;
3607
3608disable_slot:
3609 /* Disable slot, if we can do it without mem alloc */
3610 spin_lock_irqsave(&xhci->lock, flags);
3611 if (!xhci_queue_slot_control(xhci, TRB_DISABLE_SLOT, udev->slot_id))
3612 xhci_ring_cmd_db(xhci);
3613 spin_unlock_irqrestore(&xhci->lock, flags);
3614 return 0;
3615}
3616
3617/*
3618 * Issue an Address Device command (which will issue a SetAddress request to
3619 * the device).
3620 * We should be protected by the usb_address0_mutex in khubd's hub_port_init, so
3621 * we should only issue and wait on one address command at the same time.
3622 *
3623 * We add one to the device address issued by the hardware because the USB core
3624 * uses address 1 for the root hubs (even though they're not really devices).
3625 */
3626int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev)
3627{
3628 unsigned long flags;
3629 int timeleft;
3630 struct xhci_virt_device *virt_dev;
3631 int ret = 0;
3632 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
3633 struct xhci_slot_ctx *slot_ctx;
3634 struct xhci_input_control_ctx *ctrl_ctx;
3635 u64 temp_64;
3636 union xhci_trb *cmd_trb;
3637
3638 if (!udev->slot_id) {
3639 xhci_dbg(xhci, "Bad Slot ID %d\n", udev->slot_id);
3640 return -EINVAL;
3641 }
3642
3643 virt_dev = xhci->devs[udev->slot_id];
3644
3645 if (WARN_ON(!virt_dev)) {
3646 /*
3647 * In plug/unplug torture test with an NEC controller,
3648 * a zero-dereference was observed once due to virt_dev = 0.
3649 * Print useful debug rather than crash if it is observed again!
3650 */
3651 xhci_warn(xhci, "Virt dev invalid for slot_id 0x%x!\n",
3652 udev->slot_id);
3653 return -EINVAL;
3654 }
3655
3656 slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
3657 /*
3658 * If this is the first Set Address since device plug-in or
3659 * virt_device realloaction after a resume with an xHCI power loss,
3660 * then set up the slot context.
3661 */
3662 if (!slot_ctx->dev_info)
3663 xhci_setup_addressable_virt_dev(xhci, udev);
3664 /* Otherwise, update the control endpoint ring enqueue pointer. */
3665 else
3666 xhci_copy_ep0_dequeue_into_input_ctx(xhci, udev);
3667 ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
3668 ctrl_ctx->add_flags = cpu_to_le32(SLOT_FLAG | EP0_FLAG);
3669 ctrl_ctx->drop_flags = 0;
3670
3671 xhci_dbg(xhci, "Slot ID %d Input Context:\n", udev->slot_id);
3672 xhci_dbg_ctx(xhci, virt_dev->in_ctx, 2);
3673
3674 spin_lock_irqsave(&xhci->lock, flags);
3675 cmd_trb = xhci->cmd_ring->dequeue;
3676 ret = xhci_queue_address_device(xhci, virt_dev->in_ctx->dma,
3677 udev->slot_id);
3678 if (ret) {
3679 spin_unlock_irqrestore(&xhci->lock, flags);
3680 xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
3681 return ret;
3682 }
3683 xhci_ring_cmd_db(xhci);
3684 spin_unlock_irqrestore(&xhci->lock, flags);
3685
3686 /* ctrl tx can take up to 5 sec; XXX: need more time for xHC? */
3687 timeleft = wait_for_completion_interruptible_timeout(&xhci->addr_dev,
3688 XHCI_CMD_DEFAULT_TIMEOUT);
3689 /* FIXME: From section 4.3.4: "Software shall be responsible for timing
3690 * the SetAddress() "recovery interval" required by USB and aborting the
3691 * command on a timeout.
3692 */
3693 if (timeleft <= 0) {
3694 xhci_warn(xhci, "%s while waiting for address device command\n",
3695 timeleft == 0 ? "Timeout" : "Signal");
3696 /* cancel the address device command */
3697 ret = xhci_cancel_cmd(xhci, NULL, cmd_trb);
3698 if (ret < 0)
3699 return ret;
3700 return -ETIME;
3701 }
3702
3703 switch (virt_dev->cmd_status) {
3704 case COMP_CTX_STATE:
3705 case COMP_EBADSLT:
3706 xhci_err(xhci, "Setup ERROR: address device command for slot %d.\n",
3707 udev->slot_id);
3708 ret = -EINVAL;
3709 break;
3710 case COMP_TX_ERR:
3711 dev_warn(&udev->dev, "Device not responding to set address.\n");
3712 ret = -EPROTO;
3713 break;
3714 case COMP_DEV_ERR:
3715 dev_warn(&udev->dev, "ERROR: Incompatible device for address "
3716 "device command.\n");
3717 ret = -ENODEV;
3718 break;
3719 case COMP_SUCCESS:
3720 xhci_dbg(xhci, "Successful Address Device command\n");
3721 break;
3722 default:
3723 xhci_err(xhci, "ERROR: unexpected command completion "
3724 "code 0x%x.\n", virt_dev->cmd_status);
3725 xhci_dbg(xhci, "Slot ID %d Output Context:\n", udev->slot_id);
3726 xhci_dbg_ctx(xhci, virt_dev->out_ctx, 2);
3727 ret = -EINVAL;
3728 break;
3729 }
3730 if (ret) {
3731 return ret;
3732 }
3733 temp_64 = xhci_read_64(xhci, &xhci->op_regs->dcbaa_ptr);
3734 xhci_dbg(xhci, "Op regs DCBAA ptr = %#016llx\n", temp_64);
3735 xhci_dbg(xhci, "Slot ID %d dcbaa entry @%p = %#016llx\n",
3736 udev->slot_id,
3737 &xhci->dcbaa->dev_context_ptrs[udev->slot_id],
3738 (unsigned long long)
3739 le64_to_cpu(xhci->dcbaa->dev_context_ptrs[udev->slot_id]));
3740 xhci_dbg(xhci, "Output Context DMA address = %#08llx\n",
3741 (unsigned long long)virt_dev->out_ctx->dma);
3742 xhci_dbg(xhci, "Slot ID %d Input Context:\n", udev->slot_id);
3743 xhci_dbg_ctx(xhci, virt_dev->in_ctx, 2);
3744 xhci_dbg(xhci, "Slot ID %d Output Context:\n", udev->slot_id);
3745 xhci_dbg_ctx(xhci, virt_dev->out_ctx, 2);
3746 /*
3747 * USB core uses address 1 for the roothubs, so we add one to the
3748 * address given back to us by the HC.
3749 */
3750 slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->out_ctx);
3751 /* Use kernel assigned address for devices; store xHC assigned
3752 * address locally. */
3753 virt_dev->address = (le32_to_cpu(slot_ctx->dev_state) & DEV_ADDR_MASK)
3754 + 1;
3755 /* Zero the input context control for later use */
3756 ctrl_ctx->add_flags = 0;
3757 ctrl_ctx->drop_flags = 0;
3758
3759 xhci_dbg(xhci, "Internal device address = %d\n", virt_dev->address);
3760
3761 return 0;
3762}
3763
3764#ifdef CONFIG_USB_SUSPEND
3765
3766/* BESL to HIRD Encoding array for USB2 LPM */
3767static int xhci_besl_encoding[16] = {125, 150, 200, 300, 400, 500, 1000, 2000,
3768 3000, 4000, 5000, 6000, 7000, 8000, 9000, 10000};
3769
3770/* Calculate HIRD/BESL for USB2 PORTPMSC*/
3771static int xhci_calculate_hird_besl(struct xhci_hcd *xhci,
3772 struct usb_device *udev)
3773{
3774 int u2del, besl, besl_host;
3775 int besl_device = 0;
3776 u32 field;
3777
3778 u2del = HCS_U2_LATENCY(xhci->hcs_params3);
3779 field = le32_to_cpu(udev->bos->ext_cap->bmAttributes);
3780
3781 if (field & USB_BESL_SUPPORT) {
3782 for (besl_host = 0; besl_host < 16; besl_host++) {
3783 if (xhci_besl_encoding[besl_host] >= u2del)
3784 break;
3785 }
3786 /* Use baseline BESL value as default */
3787 if (field & USB_BESL_BASELINE_VALID)
3788 besl_device = USB_GET_BESL_BASELINE(field);
3789 else if (field & USB_BESL_DEEP_VALID)
3790 besl_device = USB_GET_BESL_DEEP(field);
3791 } else {
3792 if (u2del <= 50)
3793 besl_host = 0;
3794 else
3795 besl_host = (u2del - 51) / 75 + 1;
3796 }
3797
3798 besl = besl_host + besl_device;
3799 if (besl > 15)
3800 besl = 15;
3801
3802 return besl;
3803}
3804
3805static int xhci_usb2_software_lpm_test(struct usb_hcd *hcd,
3806 struct usb_device *udev)
3807{
3808 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
3809 struct dev_info *dev_info;
3810 __le32 __iomem **port_array;
3811 __le32 __iomem *addr, *pm_addr;
3812 u32 temp, dev_id;
3813 unsigned int port_num;
3814 unsigned long flags;
3815 int hird;
3816 int ret;
3817
3818 if (hcd->speed == HCD_USB3 || !xhci->sw_lpm_support ||
3819 !udev->lpm_capable)
3820 return -EINVAL;
3821
3822 /* we only support lpm for non-hub device connected to root hub yet */
3823 if (!udev->parent || udev->parent->parent ||
3824 udev->descriptor.bDeviceClass == USB_CLASS_HUB)
3825 return -EINVAL;
3826
3827 spin_lock_irqsave(&xhci->lock, flags);
3828
3829 /* Look for devices in lpm_failed_devs list */
3830 dev_id = le16_to_cpu(udev->descriptor.idVendor) << 16 |
3831 le16_to_cpu(udev->descriptor.idProduct);
3832 list_for_each_entry(dev_info, &xhci->lpm_failed_devs, list) {
3833 if (dev_info->dev_id == dev_id) {
3834 ret = -EINVAL;
3835 goto finish;
3836 }
3837 }
3838
3839 port_array = xhci->usb2_ports;
3840 port_num = udev->portnum - 1;
3841
3842 if (port_num > HCS_MAX_PORTS(xhci->hcs_params1)) {
3843 xhci_dbg(xhci, "invalid port number %d\n", udev->portnum);
3844 ret = -EINVAL;
3845 goto finish;
3846 }
3847
3848 /*
3849 * Test USB 2.0 software LPM.
3850 * FIXME: some xHCI 1.0 hosts may implement a new register to set up
3851 * hardware-controlled USB 2.0 LPM. See section 5.4.11 and 4.23.5.1.1.1
3852 * in the June 2011 errata release.
3853 */
3854 xhci_dbg(xhci, "test port %d software LPM\n", port_num);
3855 /*
3856 * Set L1 Device Slot and HIRD/BESL.
3857 * Check device's USB 2.0 extension descriptor to determine whether
3858 * HIRD or BESL shoule be used. See USB2.0 LPM errata.
3859 */
3860 pm_addr = port_array[port_num] + 1;
3861 hird = xhci_calculate_hird_besl(xhci, udev);
3862 temp = PORT_L1DS(udev->slot_id) | PORT_HIRD(hird);
3863 xhci_writel(xhci, temp, pm_addr);
3864
3865 /* Set port link state to U2(L1) */
3866 addr = port_array[port_num];
3867 xhci_set_link_state(xhci, port_array, port_num, XDEV_U2);
3868
3869 /* wait for ACK */
3870 spin_unlock_irqrestore(&xhci->lock, flags);
3871 msleep(10);
3872 spin_lock_irqsave(&xhci->lock, flags);
3873
3874 /* Check L1 Status */
3875 ret = handshake(xhci, pm_addr, PORT_L1S_MASK, PORT_L1S_SUCCESS, 125);
3876 if (ret != -ETIMEDOUT) {
3877 /* enter L1 successfully */
3878 temp = xhci_readl(xhci, addr);
3879 xhci_dbg(xhci, "port %d entered L1 state, port status 0x%x\n",
3880 port_num, temp);
3881 ret = 0;
3882 } else {
3883 temp = xhci_readl(xhci, pm_addr);
3884 xhci_dbg(xhci, "port %d software lpm failed, L1 status %d\n",
3885 port_num, temp & PORT_L1S_MASK);
3886 ret = -EINVAL;
3887 }
3888
3889 /* Resume the port */
3890 xhci_set_link_state(xhci, port_array, port_num, XDEV_U0);
3891
3892 spin_unlock_irqrestore(&xhci->lock, flags);
3893 msleep(10);
3894 spin_lock_irqsave(&xhci->lock, flags);
3895
3896 /* Clear PLC */
3897 xhci_test_and_clear_bit(xhci, port_array, port_num, PORT_PLC);
3898
3899 /* Check PORTSC to make sure the device is in the right state */
3900 if (!ret) {
3901 temp = xhci_readl(xhci, addr);
3902 xhci_dbg(xhci, "resumed port %d status 0x%x\n", port_num, temp);
3903 if (!(temp & PORT_CONNECT) || !(temp & PORT_PE) ||
3904 (temp & PORT_PLS_MASK) != XDEV_U0) {
3905 xhci_dbg(xhci, "port L1 resume fail\n");
3906 ret = -EINVAL;
3907 }
3908 }
3909
3910 if (ret) {
3911 /* Insert dev to lpm_failed_devs list */
3912 xhci_warn(xhci, "device LPM test failed, may disconnect and "
3913 "re-enumerate\n");
3914 dev_info = kzalloc(sizeof(struct dev_info), GFP_ATOMIC);
3915 if (!dev_info) {
3916 ret = -ENOMEM;
3917 goto finish;
3918 }
3919 dev_info->dev_id = dev_id;
3920 INIT_LIST_HEAD(&dev_info->list);
3921 list_add(&dev_info->list, &xhci->lpm_failed_devs);
3922 } else {
3923 xhci_ring_device(xhci, udev->slot_id);
3924 }
3925
3926finish:
3927 spin_unlock_irqrestore(&xhci->lock, flags);
3928 return ret;
3929}
3930
3931int xhci_set_usb2_hardware_lpm(struct usb_hcd *hcd,
3932 struct usb_device *udev, int enable)
3933{
3934 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
3935 __le32 __iomem **port_array;
3936 __le32 __iomem *pm_addr;
3937 u32 temp;
3938 unsigned int port_num;
3939 unsigned long flags;
3940 int hird;
3941
3942 if (hcd->speed == HCD_USB3 || !xhci->hw_lpm_support ||
3943 !udev->lpm_capable)
3944 return -EPERM;
3945
3946 if (!udev->parent || udev->parent->parent ||
3947 udev->descriptor.bDeviceClass == USB_CLASS_HUB)
3948 return -EPERM;
3949
3950 if (udev->usb2_hw_lpm_capable != 1)
3951 return -EPERM;
3952
3953 spin_lock_irqsave(&xhci->lock, flags);
3954
3955 port_array = xhci->usb2_ports;
3956 port_num = udev->portnum - 1;
3957 pm_addr = port_array[port_num] + 1;
3958 temp = xhci_readl(xhci, pm_addr);
3959
3960 xhci_dbg(xhci, "%s port %d USB2 hardware LPM\n",
3961 enable ? "enable" : "disable", port_num);
3962
3963 hird = xhci_calculate_hird_besl(xhci, udev);
3964
3965 if (enable) {
3966 temp &= ~PORT_HIRD_MASK;
3967 temp |= PORT_HIRD(hird) | PORT_RWE;
3968 xhci_writel(xhci, temp, pm_addr);
3969 temp = xhci_readl(xhci, pm_addr);
3970 temp |= PORT_HLE;
3971 xhci_writel(xhci, temp, pm_addr);
3972 } else {
3973 temp &= ~(PORT_HLE | PORT_RWE | PORT_HIRD_MASK);
3974 xhci_writel(xhci, temp, pm_addr);
3975 }
3976
3977 spin_unlock_irqrestore(&xhci->lock, flags);
3978 return 0;
3979}
3980
3981int xhci_update_device(struct usb_hcd *hcd, struct usb_device *udev)
3982{
3983 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
3984 int ret;
3985
3986 ret = xhci_usb2_software_lpm_test(hcd, udev);
3987 if (!ret) {
3988 xhci_dbg(xhci, "software LPM test succeed\n");
3989 if (xhci->hw_lpm_support == 1) {
3990 udev->usb2_hw_lpm_capable = 1;
3991 ret = xhci_set_usb2_hardware_lpm(hcd, udev, 1);
3992 if (!ret)
3993 udev->usb2_hw_lpm_enabled = 1;
3994 }
3995 }
3996
3997 return 0;
3998}
3999
4000#else
4001
4002int xhci_set_usb2_hardware_lpm(struct usb_hcd *hcd,
4003 struct usb_device *udev, int enable)
4004{
4005 return 0;
4006}
4007
4008int xhci_update_device(struct usb_hcd *hcd, struct usb_device *udev)
4009{
4010 return 0;
4011}
4012
4013#endif /* CONFIG_USB_SUSPEND */
4014
4015/*---------------------- USB 3.0 Link PM functions ------------------------*/
4016
4017#ifdef CONFIG_PM
4018/* Service interval in nanoseconds = 2^(bInterval - 1) * 125us * 1000ns / 1us */
4019static unsigned long long xhci_service_interval_to_ns(
4020 struct usb_endpoint_descriptor *desc)
4021{
4022 return (1 << (desc->bInterval - 1)) * 125 * 1000;
4023}
4024
4025static u16 xhci_get_timeout_no_hub_lpm(struct usb_device *udev,
4026 enum usb3_link_state state)
4027{
4028 unsigned long long sel;
4029 unsigned long long pel;
4030 unsigned int max_sel_pel;
4031 char *state_name;
4032
4033 switch (state) {
4034 case USB3_LPM_U1:
4035 /* Convert SEL and PEL stored in nanoseconds to microseconds */
4036 sel = DIV_ROUND_UP(udev->u1_params.sel, 1000);
4037 pel = DIV_ROUND_UP(udev->u1_params.pel, 1000);
4038 max_sel_pel = USB3_LPM_MAX_U1_SEL_PEL;
4039 state_name = "U1";
4040 break;
4041 case USB3_LPM_U2:
4042 sel = DIV_ROUND_UP(udev->u2_params.sel, 1000);
4043 pel = DIV_ROUND_UP(udev->u2_params.pel, 1000);
4044 max_sel_pel = USB3_LPM_MAX_U2_SEL_PEL;
4045 state_name = "U2";
4046 break;
4047 default:
4048 dev_warn(&udev->dev, "%s: Can't get timeout for non-U1 or U2 state.\n",
4049 __func__);
4050 return USB3_LPM_DISABLED;
4051 }
4052
4053 if (sel <= max_sel_pel && pel <= max_sel_pel)
4054 return USB3_LPM_DEVICE_INITIATED;
4055
4056 if (sel > max_sel_pel)
4057 dev_dbg(&udev->dev, "Device-initiated %s disabled "
4058 "due to long SEL %llu ms\n",
4059 state_name, sel);
4060 else
4061 dev_dbg(&udev->dev, "Device-initiated %s disabled "
4062 "due to long PEL %llu\n ms",
4063 state_name, pel);
4064 return USB3_LPM_DISABLED;
4065}
4066
4067/* Returns the hub-encoded U1 timeout value.
4068 * The U1 timeout should be the maximum of the following values:
4069 * - For control endpoints, U1 system exit latency (SEL) * 3
4070 * - For bulk endpoints, U1 SEL * 5
4071 * - For interrupt endpoints:
4072 * - Notification EPs, U1 SEL * 3
4073 * - Periodic EPs, max(105% of bInterval, U1 SEL * 2)
4074 * - For isochronous endpoints, max(105% of bInterval, U1 SEL * 2)
4075 */
4076static u16 xhci_calculate_intel_u1_timeout(struct usb_device *udev,
4077 struct usb_endpoint_descriptor *desc)
4078{
4079 unsigned long long timeout_ns;
4080 int ep_type;
4081 int intr_type;
4082
4083 ep_type = usb_endpoint_type(desc);
4084 switch (ep_type) {
4085 case USB_ENDPOINT_XFER_CONTROL:
4086 timeout_ns = udev->u1_params.sel * 3;
4087 break;
4088 case USB_ENDPOINT_XFER_BULK:
4089 timeout_ns = udev->u1_params.sel * 5;
4090 break;
4091 case USB_ENDPOINT_XFER_INT:
4092 intr_type = usb_endpoint_interrupt_type(desc);
4093 if (intr_type == USB_ENDPOINT_INTR_NOTIFICATION) {
4094 timeout_ns = udev->u1_params.sel * 3;
4095 break;
4096 }
4097 /* Otherwise the calculation is the same as isoc eps */
4098 case USB_ENDPOINT_XFER_ISOC:
4099 timeout_ns = xhci_service_interval_to_ns(desc);
4100 timeout_ns = DIV_ROUND_UP_ULL(timeout_ns * 105, 100);
4101 if (timeout_ns < udev->u1_params.sel * 2)
4102 timeout_ns = udev->u1_params.sel * 2;
4103 break;
4104 default:
4105 return 0;
4106 }
4107
4108 /* The U1 timeout is encoded in 1us intervals. */
4109 timeout_ns = DIV_ROUND_UP_ULL(timeout_ns, 1000);
4110 /* Don't return a timeout of zero, because that's USB3_LPM_DISABLED. */
4111 if (timeout_ns == USB3_LPM_DISABLED)
4112 timeout_ns++;
4113
4114 /* If the necessary timeout value is bigger than what we can set in the
4115 * USB 3.0 hub, we have to disable hub-initiated U1.
4116 */
4117 if (timeout_ns <= USB3_LPM_U1_MAX_TIMEOUT)
4118 return timeout_ns;
4119 dev_dbg(&udev->dev, "Hub-initiated U1 disabled "
4120 "due to long timeout %llu ms\n", timeout_ns);
4121 return xhci_get_timeout_no_hub_lpm(udev, USB3_LPM_U1);
4122}
4123
4124/* Returns the hub-encoded U2 timeout value.
4125 * The U2 timeout should be the maximum of:
4126 * - 10 ms (to avoid the bandwidth impact on the scheduler)
4127 * - largest bInterval of any active periodic endpoint (to avoid going
4128 * into lower power link states between intervals).
4129 * - the U2 Exit Latency of the device
4130 */
4131static u16 xhci_calculate_intel_u2_timeout(struct usb_device *udev,
4132 struct usb_endpoint_descriptor *desc)
4133{
4134 unsigned long long timeout_ns;
4135 unsigned long long u2_del_ns;
4136
4137 timeout_ns = 10 * 1000 * 1000;
4138
4139 if ((usb_endpoint_xfer_int(desc) || usb_endpoint_xfer_isoc(desc)) &&
4140 (xhci_service_interval_to_ns(desc) > timeout_ns))
4141 timeout_ns = xhci_service_interval_to_ns(desc);
4142
4143 u2_del_ns = udev->bos->ss_cap->bU2DevExitLat * 1000;
4144 if (u2_del_ns > timeout_ns)
4145 timeout_ns = u2_del_ns;
4146
4147 /* The U2 timeout is encoded in 256us intervals */
4148 timeout_ns = DIV_ROUND_UP_ULL(timeout_ns, 256 * 1000);
4149 /* If the necessary timeout value is bigger than what we can set in the
4150 * USB 3.0 hub, we have to disable hub-initiated U2.
4151 */
4152 if (timeout_ns <= USB3_LPM_U2_MAX_TIMEOUT)
4153 return timeout_ns;
4154 dev_dbg(&udev->dev, "Hub-initiated U2 disabled "
4155 "due to long timeout %llu ms\n", timeout_ns);
4156 return xhci_get_timeout_no_hub_lpm(udev, USB3_LPM_U2);
4157}
4158
4159static u16 xhci_call_host_update_timeout_for_endpoint(struct xhci_hcd *xhci,
4160 struct usb_device *udev,
4161 struct usb_endpoint_descriptor *desc,
4162 enum usb3_link_state state,
4163 u16 *timeout)
4164{
4165 if (state == USB3_LPM_U1) {
4166 if (xhci->quirks & XHCI_INTEL_HOST)
4167 return xhci_calculate_intel_u1_timeout(udev, desc);
4168 } else {
4169 if (xhci->quirks & XHCI_INTEL_HOST)
4170 return xhci_calculate_intel_u2_timeout(udev, desc);
4171 }
4172
4173 return USB3_LPM_DISABLED;
4174}
4175
4176static int xhci_update_timeout_for_endpoint(struct xhci_hcd *xhci,
4177 struct usb_device *udev,
4178 struct usb_endpoint_descriptor *desc,
4179 enum usb3_link_state state,
4180 u16 *timeout)
4181{
4182 u16 alt_timeout;
4183
4184 alt_timeout = xhci_call_host_update_timeout_for_endpoint(xhci, udev,
4185 desc, state, timeout);
4186
4187 /* If we found we can't enable hub-initiated LPM, or
4188 * the U1 or U2 exit latency was too high to allow
4189 * device-initiated LPM as well, just stop searching.
4190 */
4191 if (alt_timeout == USB3_LPM_DISABLED ||
4192 alt_timeout == USB3_LPM_DEVICE_INITIATED) {
4193 *timeout = alt_timeout;
4194 return -E2BIG;
4195 }
4196 if (alt_timeout > *timeout)
4197 *timeout = alt_timeout;
4198 return 0;
4199}
4200
4201static int xhci_update_timeout_for_interface(struct xhci_hcd *xhci,
4202 struct usb_device *udev,
4203 struct usb_host_interface *alt,
4204 enum usb3_link_state state,
4205 u16 *timeout)
4206{
4207 int j;
4208
4209 for (j = 0; j < alt->desc.bNumEndpoints; j++) {
4210 if (xhci_update_timeout_for_endpoint(xhci, udev,
4211 &alt->endpoint[j].desc, state, timeout))
4212 return -E2BIG;
4213 continue;
4214 }
4215 return 0;
4216}
4217
4218static int xhci_check_intel_tier_policy(struct usb_device *udev,
4219 enum usb3_link_state state)
4220{
4221 struct usb_device *parent;
4222 unsigned int num_hubs;
4223
4224 if (state == USB3_LPM_U2)
4225 return 0;
4226
4227 /* Don't enable U1 if the device is on a 2nd tier hub or lower. */
4228 for (parent = udev->parent, num_hubs = 0; parent->parent;
4229 parent = parent->parent)
4230 num_hubs++;
4231
4232 if (num_hubs < 2)
4233 return 0;
4234
4235 dev_dbg(&udev->dev, "Disabling U1 link state for device"
4236 " below second-tier hub.\n");
4237 dev_dbg(&udev->dev, "Plug device into first-tier hub "
4238 "to decrease power consumption.\n");
4239 return -E2BIG;
4240}
4241
4242static int xhci_check_tier_policy(struct xhci_hcd *xhci,
4243 struct usb_device *udev,
4244 enum usb3_link_state state)
4245{
4246 if (xhci->quirks & XHCI_INTEL_HOST)
4247 return xhci_check_intel_tier_policy(udev, state);
4248 return -EINVAL;
4249}
4250
4251/* Returns the U1 or U2 timeout that should be enabled.
4252 * If the tier check or timeout setting functions return with a non-zero exit
4253 * code, that means the timeout value has been finalized and we shouldn't look
4254 * at any more endpoints.
4255 */
4256static u16 xhci_calculate_lpm_timeout(struct usb_hcd *hcd,
4257 struct usb_device *udev, enum usb3_link_state state)
4258{
4259 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
4260 struct usb_host_config *config;
4261 char *state_name;
4262 int i;
4263 u16 timeout = USB3_LPM_DISABLED;
4264
4265 if (state == USB3_LPM_U1)
4266 state_name = "U1";
4267 else if (state == USB3_LPM_U2)
4268 state_name = "U2";
4269 else {
4270 dev_warn(&udev->dev, "Can't enable unknown link state %i\n",
4271 state);
4272 return timeout;
4273 }
4274
4275 if (xhci_check_tier_policy(xhci, udev, state) < 0)
4276 return timeout;
4277
4278 /* Gather some information about the currently installed configuration
4279 * and alternate interface settings.
4280 */
4281 if (xhci_update_timeout_for_endpoint(xhci, udev, &udev->ep0.desc,
4282 state, &timeout))
4283 return timeout;
4284
4285 config = udev->actconfig;
4286 if (!config)
4287 return timeout;
4288
4289 for (i = 0; i < USB_MAXINTERFACES; i++) {
4290 struct usb_driver *driver;
4291 struct usb_interface *intf = config->interface[i];
4292
4293 if (!intf)
4294 continue;
4295
4296 /* Check if any currently bound drivers want hub-initiated LPM
4297 * disabled.
4298 */
4299 if (intf->dev.driver) {
4300 driver = to_usb_driver(intf->dev.driver);
4301 if (driver && driver->disable_hub_initiated_lpm) {
4302 dev_dbg(&udev->dev, "Hub-initiated %s disabled "
4303 "at request of driver %s\n",
4304 state_name, driver->name);
4305 return xhci_get_timeout_no_hub_lpm(udev, state);
4306 }
4307 }
4308
4309 /* Not sure how this could happen... */
4310 if (!intf->cur_altsetting)
4311 continue;
4312
4313 if (xhci_update_timeout_for_interface(xhci, udev,
4314 intf->cur_altsetting,
4315 state, &timeout))
4316 return timeout;
4317 }
4318 return timeout;
4319}
4320
4321/*
4322 * Issue an Evaluate Context command to change the Maximum Exit Latency in the
4323 * slot context. If that succeeds, store the new MEL in the xhci_virt_device.
4324 */
4325static int xhci_change_max_exit_latency(struct xhci_hcd *xhci,
4326 struct usb_device *udev, u16 max_exit_latency)
4327{
4328 struct xhci_virt_device *virt_dev;
4329 struct xhci_command *command;
4330 struct xhci_input_control_ctx *ctrl_ctx;
4331 struct xhci_slot_ctx *slot_ctx;
4332 unsigned long flags;
4333 int ret;
4334
4335 spin_lock_irqsave(&xhci->lock, flags);
4336 if (max_exit_latency == xhci->devs[udev->slot_id]->current_mel) {
4337 spin_unlock_irqrestore(&xhci->lock, flags);
4338 return 0;
4339 }
4340
4341 /* Attempt to issue an Evaluate Context command to change the MEL. */
4342 virt_dev = xhci->devs[udev->slot_id];
4343 command = xhci->lpm_command;
4344 xhci_slot_copy(xhci, command->in_ctx, virt_dev->out_ctx);
4345 spin_unlock_irqrestore(&xhci->lock, flags);
4346
4347 ctrl_ctx = xhci_get_input_control_ctx(xhci, command->in_ctx);
4348 ctrl_ctx->add_flags |= cpu_to_le32(SLOT_FLAG);
4349 slot_ctx = xhci_get_slot_ctx(xhci, command->in_ctx);
4350 slot_ctx->dev_info2 &= cpu_to_le32(~((u32) MAX_EXIT));
4351 slot_ctx->dev_info2 |= cpu_to_le32(max_exit_latency);
4352
4353 xhci_dbg(xhci, "Set up evaluate context for LPM MEL change.\n");
4354 xhci_dbg(xhci, "Slot %u Input Context:\n", udev->slot_id);
4355 xhci_dbg_ctx(xhci, command->in_ctx, 0);
4356
4357 /* Issue and wait for the evaluate context command. */
4358 ret = xhci_configure_endpoint(xhci, udev, command,
4359 true, true);
4360 xhci_dbg(xhci, "Slot %u Output Context:\n", udev->slot_id);
4361 xhci_dbg_ctx(xhci, virt_dev->out_ctx, 0);
4362
4363 if (!ret) {
4364 spin_lock_irqsave(&xhci->lock, flags);
4365 virt_dev->current_mel = max_exit_latency;
4366 spin_unlock_irqrestore(&xhci->lock, flags);
4367 }
4368 return ret;
4369}
4370
4371static int calculate_max_exit_latency(struct usb_device *udev,
4372 enum usb3_link_state state_changed,
4373 u16 hub_encoded_timeout)
4374{
4375 unsigned long long u1_mel_us = 0;
4376 unsigned long long u2_mel_us = 0;
4377 unsigned long long mel_us = 0;
4378 bool disabling_u1;
4379 bool disabling_u2;
4380 bool enabling_u1;
4381 bool enabling_u2;
4382
4383 disabling_u1 = (state_changed == USB3_LPM_U1 &&
4384 hub_encoded_timeout == USB3_LPM_DISABLED);
4385 disabling_u2 = (state_changed == USB3_LPM_U2 &&
4386 hub_encoded_timeout == USB3_LPM_DISABLED);
4387
4388 enabling_u1 = (state_changed == USB3_LPM_U1 &&
4389 hub_encoded_timeout != USB3_LPM_DISABLED);
4390 enabling_u2 = (state_changed == USB3_LPM_U2 &&
4391 hub_encoded_timeout != USB3_LPM_DISABLED);
4392
4393 /* If U1 was already enabled and we're not disabling it,
4394 * or we're going to enable U1, account for the U1 max exit latency.
4395 */
4396 if ((udev->u1_params.timeout != USB3_LPM_DISABLED && !disabling_u1) ||
4397 enabling_u1)
4398 u1_mel_us = DIV_ROUND_UP(udev->u1_params.mel, 1000);
4399 if ((udev->u2_params.timeout != USB3_LPM_DISABLED && !disabling_u2) ||
4400 enabling_u2)
4401 u2_mel_us = DIV_ROUND_UP(udev->u2_params.mel, 1000);
4402
4403 if (u1_mel_us > u2_mel_us)
4404 mel_us = u1_mel_us;
4405 else
4406 mel_us = u2_mel_us;
4407 /* xHCI host controller max exit latency field is only 16 bits wide. */
4408 if (mel_us > MAX_EXIT) {
4409 dev_warn(&udev->dev, "Link PM max exit latency of %lluus "
4410 "is too big.\n", mel_us);
4411 return -E2BIG;
4412 }
4413 return mel_us;
4414}
4415
4416/* Returns the USB3 hub-encoded value for the U1/U2 timeout. */
4417int xhci_enable_usb3_lpm_timeout(struct usb_hcd *hcd,
4418 struct usb_device *udev, enum usb3_link_state state)
4419{
4420 struct xhci_hcd *xhci;
4421 u16 hub_encoded_timeout;
4422 int mel;
4423 int ret;
4424
4425 xhci = hcd_to_xhci(hcd);
4426 /* The LPM timeout values are pretty host-controller specific, so don't
4427 * enable hub-initiated timeouts unless the vendor has provided
4428 * information about their timeout algorithm.
4429 */
4430 if (!xhci || !(xhci->quirks & XHCI_LPM_SUPPORT) ||
4431 !xhci->devs[udev->slot_id])
4432 return USB3_LPM_DISABLED;
4433
4434 hub_encoded_timeout = xhci_calculate_lpm_timeout(hcd, udev, state);
4435 mel = calculate_max_exit_latency(udev, state, hub_encoded_timeout);
4436 if (mel < 0) {
4437 /* Max Exit Latency is too big, disable LPM. */
4438 hub_encoded_timeout = USB3_LPM_DISABLED;
4439 mel = 0;
4440 }
4441
4442 ret = xhci_change_max_exit_latency(xhci, udev, mel);
4443 if (ret)
4444 return ret;
4445 return hub_encoded_timeout;
4446}
4447
4448int xhci_disable_usb3_lpm_timeout(struct usb_hcd *hcd,
4449 struct usb_device *udev, enum usb3_link_state state)
4450{
4451 struct xhci_hcd *xhci;
4452 u16 mel;
4453 int ret;
4454
4455 xhci = hcd_to_xhci(hcd);
4456 if (!xhci || !(xhci->quirks & XHCI_LPM_SUPPORT) ||
4457 !xhci->devs[udev->slot_id])
4458 return 0;
4459
4460 mel = calculate_max_exit_latency(udev, state, USB3_LPM_DISABLED);
4461 ret = xhci_change_max_exit_latency(xhci, udev, mel);
4462 if (ret)
4463 return ret;
4464 return 0;
4465}
4466#else /* CONFIG_PM */
4467
4468int xhci_enable_usb3_lpm_timeout(struct usb_hcd *hcd,
4469 struct usb_device *udev, enum usb3_link_state state)
4470{
4471 return USB3_LPM_DISABLED;
4472}
4473
4474int xhci_disable_usb3_lpm_timeout(struct usb_hcd *hcd,
4475 struct usb_device *udev, enum usb3_link_state state)
4476{
4477 return 0;
4478}
4479#endif /* CONFIG_PM */
4480
4481/*-------------------------------------------------------------------------*/
4482
4483/* Once a hub descriptor is fetched for a device, we need to update the xHC's
4484 * internal data structures for the device.
4485 */
4486int xhci_update_hub_device(struct usb_hcd *hcd, struct usb_device *hdev,
4487 struct usb_tt *tt, gfp_t mem_flags)
4488{
4489 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
4490 struct xhci_virt_device *vdev;
4491 struct xhci_command *config_cmd;
4492 struct xhci_input_control_ctx *ctrl_ctx;
4493 struct xhci_slot_ctx *slot_ctx;
4494 unsigned long flags;
4495 unsigned think_time;
4496 int ret;
4497
4498 /* Ignore root hubs */
4499 if (!hdev->parent)
4500 return 0;
4501
4502 vdev = xhci->devs[hdev->slot_id];
4503 if (!vdev) {
4504 xhci_warn(xhci, "Cannot update hub desc for unknown device.\n");
4505 return -EINVAL;
4506 }
4507 config_cmd = xhci_alloc_command(xhci, true, true, mem_flags);
4508 if (!config_cmd) {
4509 xhci_dbg(xhci, "Could not allocate xHCI command structure.\n");
4510 return -ENOMEM;
4511 }
4512
4513 spin_lock_irqsave(&xhci->lock, flags);
4514 if (hdev->speed == USB_SPEED_HIGH &&
4515 xhci_alloc_tt_info(xhci, vdev, hdev, tt, GFP_ATOMIC)) {
4516 xhci_dbg(xhci, "Could not allocate xHCI TT structure.\n");
4517 xhci_free_command(xhci, config_cmd);
4518 spin_unlock_irqrestore(&xhci->lock, flags);
4519 return -ENOMEM;
4520 }
4521
4522 xhci_slot_copy(xhci, config_cmd->in_ctx, vdev->out_ctx);
4523 ctrl_ctx = xhci_get_input_control_ctx(xhci, config_cmd->in_ctx);
4524 ctrl_ctx->add_flags |= cpu_to_le32(SLOT_FLAG);
4525 slot_ctx = xhci_get_slot_ctx(xhci, config_cmd->in_ctx);
4526 slot_ctx->dev_info |= cpu_to_le32(DEV_HUB);
4527 if (tt->multi)
4528 slot_ctx->dev_info |= cpu_to_le32(DEV_MTT);
4529 if (xhci->hci_version > 0x95) {
4530 xhci_dbg(xhci, "xHCI version %x needs hub "
4531 "TT think time and number of ports\n",
4532 (unsigned int) xhci->hci_version);
4533 slot_ctx->dev_info2 |= cpu_to_le32(XHCI_MAX_PORTS(hdev->maxchild));
4534 /* Set TT think time - convert from ns to FS bit times.
4535 * 0 = 8 FS bit times, 1 = 16 FS bit times,
4536 * 2 = 24 FS bit times, 3 = 32 FS bit times.
4537 *
4538 * xHCI 1.0: this field shall be 0 if the device is not a
4539 * High-spped hub.
4540 */
4541 think_time = tt->think_time;
4542 if (think_time != 0)
4543 think_time = (think_time / 666) - 1;
4544 if (xhci->hci_version < 0x100 || hdev->speed == USB_SPEED_HIGH)
4545 slot_ctx->tt_info |=
4546 cpu_to_le32(TT_THINK_TIME(think_time));
4547 } else {
4548 xhci_dbg(xhci, "xHCI version %x doesn't need hub "
4549 "TT think time or number of ports\n",
4550 (unsigned int) xhci->hci_version);
4551 }
4552 slot_ctx->dev_state = 0;
4553 spin_unlock_irqrestore(&xhci->lock, flags);
4554
4555 xhci_dbg(xhci, "Set up %s for hub device.\n",
4556 (xhci->hci_version > 0x95) ?
4557 "configure endpoint" : "evaluate context");
4558 xhci_dbg(xhci, "Slot %u Input Context:\n", hdev->slot_id);
4559 xhci_dbg_ctx(xhci, config_cmd->in_ctx, 0);
4560
4561 /* Issue and wait for the configure endpoint or
4562 * evaluate context command.
4563 */
4564 if (xhci->hci_version > 0x95)
4565 ret = xhci_configure_endpoint(xhci, hdev, config_cmd,
4566 false, false);
4567 else
4568 ret = xhci_configure_endpoint(xhci, hdev, config_cmd,
4569 true, false);
4570
4571 xhci_dbg(xhci, "Slot %u Output Context:\n", hdev->slot_id);
4572 xhci_dbg_ctx(xhci, vdev->out_ctx, 0);
4573
4574 xhci_free_command(xhci, config_cmd);
4575 return ret;
4576}
4577
4578int xhci_get_frame(struct usb_hcd *hcd)
4579{
4580 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
4581 /* EHCI mods by the periodic size. Why? */
4582 return xhci_readl(xhci, &xhci->run_regs->microframe_index) >> 3;
4583}
4584
4585int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks)
4586{
4587 struct xhci_hcd *xhci;
4588 struct device *dev = hcd->self.controller;
4589 int retval;
4590 u32 temp;
4591
4592 /* Accept arbitrarily long scatter-gather lists */
4593 hcd->self.sg_tablesize = ~0;
4594
4595 if (usb_hcd_is_primary_hcd(hcd)) {
4596 xhci = kzalloc(sizeof(struct xhci_hcd), GFP_KERNEL);
4597 if (!xhci)
4598 return -ENOMEM;
4599 *((struct xhci_hcd **) hcd->hcd_priv) = xhci;
4600 xhci->main_hcd = hcd;
4601 /* Mark the first roothub as being USB 2.0.
4602 * The xHCI driver will register the USB 3.0 roothub.
4603 */
4604 hcd->speed = HCD_USB2;
4605 hcd->self.root_hub->speed = USB_SPEED_HIGH;
4606 /*
4607 * USB 2.0 roothub under xHCI has an integrated TT,
4608 * (rate matching hub) as opposed to having an OHCI/UHCI
4609 * companion controller.
4610 */
4611 hcd->has_tt = 1;
4612 } else {
4613 /* xHCI private pointer was set in xhci_pci_probe for the second
4614 * registered roothub.
4615 */
4616 xhci = hcd_to_xhci(hcd);
4617 temp = xhci_readl(xhci, &xhci->cap_regs->hcc_params);
4618 if (HCC_64BIT_ADDR(temp)) {
4619 xhci_dbg(xhci, "Enabling 64-bit DMA addresses.\n");
4620 dma_set_mask(hcd->self.controller, DMA_BIT_MASK(64));
4621 } else {
4622 dma_set_mask(hcd->self.controller, DMA_BIT_MASK(32));
4623 }
4624 return 0;
4625 }
4626
4627 xhci->cap_regs = hcd->regs;
4628 xhci->op_regs = hcd->regs +
4629 HC_LENGTH(xhci_readl(xhci, &xhci->cap_regs->hc_capbase));
4630 xhci->run_regs = hcd->regs +
4631 (xhci_readl(xhci, &xhci->cap_regs->run_regs_off) & RTSOFF_MASK);
4632 /* Cache read-only capability registers */
4633 xhci->hcs_params1 = xhci_readl(xhci, &xhci->cap_regs->hcs_params1);
4634 xhci->hcs_params2 = xhci_readl(xhci, &xhci->cap_regs->hcs_params2);
4635 xhci->hcs_params3 = xhci_readl(xhci, &xhci->cap_regs->hcs_params3);
4636 xhci->hcc_params = xhci_readl(xhci, &xhci->cap_regs->hc_capbase);
4637 xhci->hci_version = HC_VERSION(xhci->hcc_params);
4638 xhci->hcc_params = xhci_readl(xhci, &xhci->cap_regs->hcc_params);
4639 xhci_print_registers(xhci);
4640
4641 get_quirks(dev, xhci);
4642
4643 /* Make sure the HC is halted. */
4644 retval = xhci_halt(xhci);
4645 if (retval)
4646 goto error;
4647
4648 xhci_dbg(xhci, "Resetting HCD\n");
4649 /* Reset the internal HC memory state and registers. */
4650 retval = xhci_reset(xhci);
4651 if (retval)
4652 goto error;
4653 xhci_dbg(xhci, "Reset complete\n");
4654
4655 temp = xhci_readl(xhci, &xhci->cap_regs->hcc_params);
4656 if (HCC_64BIT_ADDR(temp)) {
4657 xhci_dbg(xhci, "Enabling 64-bit DMA addresses.\n");
4658 dma_set_mask(hcd->self.controller, DMA_BIT_MASK(64));
4659 } else {
4660 dma_set_mask(hcd->self.controller, DMA_BIT_MASK(32));
4661 }
4662
4663 xhci_dbg(xhci, "Calling HCD init\n");
4664 /* Initialize HCD and host controller data structures. */
4665 retval = xhci_init(hcd);
4666 if (retval)
4667 goto error;
4668 xhci_dbg(xhci, "Called HCD init\n");
4669 return 0;
4670error:
4671 kfree(xhci);
4672 return retval;
4673}
4674
4675MODULE_DESCRIPTION(DRIVER_DESC);
4676MODULE_AUTHOR(DRIVER_AUTHOR);
4677MODULE_LICENSE("GPL");
4678
4679static int __init xhci_hcd_init(void)
4680{
4681 int retval;
4682
4683 retval = xhci_register_pci();
4684 if (retval < 0) {
4685 printk(KERN_DEBUG "Problem registering PCI driver.");
4686 return retval;
4687 }
4688 retval = xhci_register_plat();
4689 if (retval < 0) {
4690 printk(KERN_DEBUG "Problem registering platform driver.");
4691 goto unreg_pci;
4692 }
4693 /*
4694 * Check the compiler generated sizes of structures that must be laid
4695 * out in specific ways for hardware access.
4696 */
4697 BUILD_BUG_ON(sizeof(struct xhci_doorbell_array) != 256*32/8);
4698 BUILD_BUG_ON(sizeof(struct xhci_slot_ctx) != 8*32/8);
4699 BUILD_BUG_ON(sizeof(struct xhci_ep_ctx) != 8*32/8);
4700 /* xhci_device_control has eight fields, and also
4701 * embeds one xhci_slot_ctx and 31 xhci_ep_ctx
4702 */
4703 BUILD_BUG_ON(sizeof(struct xhci_stream_ctx) != 4*32/8);
4704 BUILD_BUG_ON(sizeof(union xhci_trb) != 4*32/8);
4705 BUILD_BUG_ON(sizeof(struct xhci_erst_entry) != 4*32/8);
4706 BUILD_BUG_ON(sizeof(struct xhci_cap_regs) != 7*32/8);
4707 BUILD_BUG_ON(sizeof(struct xhci_intr_reg) != 8*32/8);
4708 /* xhci_run_regs has eight fields and embeds 128 xhci_intr_regs */
4709 BUILD_BUG_ON(sizeof(struct xhci_run_regs) != (8+8*128)*32/8);
4710 return 0;
4711unreg_pci:
4712 xhci_unregister_pci();
4713 return retval;
4714}
4715module_init(xhci_hcd_init);
4716
4717static void __exit xhci_hcd_cleanup(void)
4718{
4719 xhci_unregister_pci();
4720 xhci_unregister_plat();
4721}
4722module_exit(xhci_hcd_cleanup);