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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2003-2008 Takahiro Hirofuchi
4 * Copyright (C) 2015-2016 Nobuo Iwata
5 */
6
7#include <linux/init.h>
8#include <linux/file.h>
9#include <linux/kernel.h>
10#include <linux/kthread.h>
11#include <linux/module.h>
12#include <linux/platform_device.h>
13#include <linux/slab.h>
14
15#include "usbip_common.h"
16#include "vhci.h"
17
18#define DRIVER_AUTHOR "Takahiro Hirofuchi"
19#define DRIVER_DESC "USB/IP 'Virtual' Host Controller (VHCI) Driver"
20
21/*
22 * TODO
23 * - update root hub emulation
24 * - move the emulation code to userland ?
25 * porting to other operating systems
26 * minimize kernel code
27 * - add suspend/resume code
28 * - clean up everything
29 */
30
31/* See usb gadget dummy hcd */
32
33static int vhci_hub_status(struct usb_hcd *hcd, char *buff);
34static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
35 u16 wIndex, char *buff, u16 wLength);
36static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
37 gfp_t mem_flags);
38static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status);
39static int vhci_start(struct usb_hcd *vhci_hcd);
40static void vhci_stop(struct usb_hcd *hcd);
41static int vhci_get_frame_number(struct usb_hcd *hcd);
42
43static const char driver_name[] = "vhci_hcd";
44static const char driver_desc[] = "USB/IP Virtual Host Controller";
45
46int vhci_num_controllers = VHCI_NR_HCS;
47struct vhci *vhcis;
48
49static const char * const bit_desc[] = {
50 "CONNECTION", /*0*/
51 "ENABLE", /*1*/
52 "SUSPEND", /*2*/
53 "OVER_CURRENT", /*3*/
54 "RESET", /*4*/
55 "L1", /*5*/
56 "R6", /*6*/
57 "R7", /*7*/
58 "POWER", /*8*/
59 "LOWSPEED", /*9*/
60 "HIGHSPEED", /*10*/
61 "PORT_TEST", /*11*/
62 "INDICATOR", /*12*/
63 "R13", /*13*/
64 "R14", /*14*/
65 "R15", /*15*/
66 "C_CONNECTION", /*16*/
67 "C_ENABLE", /*17*/
68 "C_SUSPEND", /*18*/
69 "C_OVER_CURRENT", /*19*/
70 "C_RESET", /*20*/
71 "C_L1", /*21*/
72 "R22", /*22*/
73 "R23", /*23*/
74 "R24", /*24*/
75 "R25", /*25*/
76 "R26", /*26*/
77 "R27", /*27*/
78 "R28", /*28*/
79 "R29", /*29*/
80 "R30", /*30*/
81 "R31", /*31*/
82};
83
84static const char * const bit_desc_ss[] = {
85 "CONNECTION", /*0*/
86 "ENABLE", /*1*/
87 "SUSPEND", /*2*/
88 "OVER_CURRENT", /*3*/
89 "RESET", /*4*/
90 "L1", /*5*/
91 "R6", /*6*/
92 "R7", /*7*/
93 "R8", /*8*/
94 "POWER", /*9*/
95 "HIGHSPEED", /*10*/
96 "PORT_TEST", /*11*/
97 "INDICATOR", /*12*/
98 "R13", /*13*/
99 "R14", /*14*/
100 "R15", /*15*/
101 "C_CONNECTION", /*16*/
102 "C_ENABLE", /*17*/
103 "C_SUSPEND", /*18*/
104 "C_OVER_CURRENT", /*19*/
105 "C_RESET", /*20*/
106 "C_BH_RESET", /*21*/
107 "C_LINK_STATE", /*22*/
108 "C_CONFIG_ERROR", /*23*/
109 "R24", /*24*/
110 "R25", /*25*/
111 "R26", /*26*/
112 "R27", /*27*/
113 "R28", /*28*/
114 "R29", /*29*/
115 "R30", /*30*/
116 "R31", /*31*/
117};
118
119static void dump_port_status_diff(u32 prev_status, u32 new_status, bool usb3)
120{
121 int i = 0;
122 u32 bit = 1;
123 const char * const *desc = bit_desc;
124
125 if (usb3)
126 desc = bit_desc_ss;
127
128 pr_debug("status prev -> new: %08x -> %08x\n", prev_status, new_status);
129 while (bit) {
130 u32 prev = prev_status & bit;
131 u32 new = new_status & bit;
132 char change;
133
134 if (!prev && new)
135 change = '+';
136 else if (prev && !new)
137 change = '-';
138 else
139 change = ' ';
140
141 if (prev || new) {
142 pr_debug(" %c%s\n", change, desc[i]);
143
144 if (bit == 1) /* USB_PORT_STAT_CONNECTION */
145 pr_debug(" %c%s\n", change, "USB_PORT_STAT_SPEED_5GBPS");
146 }
147 bit <<= 1;
148 i++;
149 }
150 pr_debug("\n");
151}
152
153void rh_port_connect(struct vhci_device *vdev, enum usb_device_speed speed)
154{
155 struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev);
156 struct vhci *vhci = vhci_hcd->vhci;
157 int rhport = vdev->rhport;
158 u32 status;
159 unsigned long flags;
160
161 usbip_dbg_vhci_rh("rh_port_connect %d\n", rhport);
162
163 spin_lock_irqsave(&vhci->lock, flags);
164
165 status = vhci_hcd->port_status[rhport];
166
167 status |= USB_PORT_STAT_CONNECTION | (1 << USB_PORT_FEAT_C_CONNECTION);
168
169 switch (speed) {
170 case USB_SPEED_HIGH:
171 status |= USB_PORT_STAT_HIGH_SPEED;
172 break;
173 case USB_SPEED_LOW:
174 status |= USB_PORT_STAT_LOW_SPEED;
175 break;
176 default:
177 break;
178 }
179
180 vhci_hcd->port_status[rhport] = status;
181
182 spin_unlock_irqrestore(&vhci->lock, flags);
183
184 usb_hcd_poll_rh_status(vhci_hcd_to_hcd(vhci_hcd));
185}
186
187static void rh_port_disconnect(struct vhci_device *vdev)
188{
189 struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev);
190 struct vhci *vhci = vhci_hcd->vhci;
191 int rhport = vdev->rhport;
192 u32 status;
193 unsigned long flags;
194
195 usbip_dbg_vhci_rh("rh_port_disconnect %d\n", rhport);
196
197 spin_lock_irqsave(&vhci->lock, flags);
198
199 status = vhci_hcd->port_status[rhport];
200
201 status &= ~USB_PORT_STAT_CONNECTION;
202 status |= (1 << USB_PORT_FEAT_C_CONNECTION);
203
204 vhci_hcd->port_status[rhport] = status;
205
206 spin_unlock_irqrestore(&vhci->lock, flags);
207 usb_hcd_poll_rh_status(vhci_hcd_to_hcd(vhci_hcd));
208}
209
210#define PORT_C_MASK \
211 ((USB_PORT_STAT_C_CONNECTION \
212 | USB_PORT_STAT_C_ENABLE \
213 | USB_PORT_STAT_C_SUSPEND \
214 | USB_PORT_STAT_C_OVERCURRENT \
215 | USB_PORT_STAT_C_RESET) << 16)
216
217/*
218 * Returns 0 if the status hasn't changed, or the number of bytes in buf.
219 * Ports are 0-indexed from the HCD point of view,
220 * and 1-indexed from the USB core pointer of view.
221 *
222 * @buf: a bitmap to show which port status has been changed.
223 * bit 0: reserved
224 * bit 1: the status of port 0 has been changed.
225 * bit 2: the status of port 1 has been changed.
226 * ...
227 */
228static int vhci_hub_status(struct usb_hcd *hcd, char *buf)
229{
230 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
231 struct vhci *vhci = vhci_hcd->vhci;
232 int retval = DIV_ROUND_UP(VHCI_HC_PORTS + 1, 8);
233 int rhport;
234 int changed = 0;
235 unsigned long flags;
236
237 memset(buf, 0, retval);
238
239 spin_lock_irqsave(&vhci->lock, flags);
240 if (!HCD_HW_ACCESSIBLE(hcd)) {
241 usbip_dbg_vhci_rh("hw accessible flag not on?\n");
242 goto done;
243 }
244
245 /* check pseudo status register for each port */
246 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
247 if ((vhci_hcd->port_status[rhport] & PORT_C_MASK)) {
248 /* The status of a port has been changed, */
249 usbip_dbg_vhci_rh("port %d status changed\n", rhport);
250
251 buf[(rhport + 1) / 8] |= 1 << (rhport + 1) % 8;
252 changed = 1;
253 }
254 }
255
256 if ((hcd->state == HC_STATE_SUSPENDED) && (changed == 1))
257 usb_hcd_resume_root_hub(hcd);
258
259done:
260 spin_unlock_irqrestore(&vhci->lock, flags);
261 return changed ? retval : 0;
262}
263
264/* usb 3.0 root hub device descriptor */
265static struct {
266 struct usb_bos_descriptor bos;
267 struct usb_ss_cap_descriptor ss_cap;
268} __packed usb3_bos_desc = {
269
270 .bos = {
271 .bLength = USB_DT_BOS_SIZE,
272 .bDescriptorType = USB_DT_BOS,
273 .wTotalLength = cpu_to_le16(sizeof(usb3_bos_desc)),
274 .bNumDeviceCaps = 1,
275 },
276 .ss_cap = {
277 .bLength = USB_DT_USB_SS_CAP_SIZE,
278 .bDescriptorType = USB_DT_DEVICE_CAPABILITY,
279 .bDevCapabilityType = USB_SS_CAP_TYPE,
280 .wSpeedSupported = cpu_to_le16(USB_5GBPS_OPERATION),
281 .bFunctionalitySupport = ilog2(USB_5GBPS_OPERATION),
282 },
283};
284
285static inline void
286ss_hub_descriptor(struct usb_hub_descriptor *desc)
287{
288 memset(desc, 0, sizeof *desc);
289 desc->bDescriptorType = USB_DT_SS_HUB;
290 desc->bDescLength = 12;
291 desc->wHubCharacteristics = cpu_to_le16(
292 HUB_CHAR_INDV_PORT_LPSM | HUB_CHAR_COMMON_OCPM);
293 desc->bNbrPorts = VHCI_HC_PORTS;
294 desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/
295 desc->u.ss.DeviceRemovable = 0xffff;
296}
297
298static inline void hub_descriptor(struct usb_hub_descriptor *desc)
299{
300 int width;
301
302 memset(desc, 0, sizeof(*desc));
303 desc->bDescriptorType = USB_DT_HUB;
304 desc->wHubCharacteristics = cpu_to_le16(
305 HUB_CHAR_INDV_PORT_LPSM | HUB_CHAR_COMMON_OCPM);
306
307 desc->bNbrPorts = VHCI_HC_PORTS;
308 BUILD_BUG_ON(VHCI_HC_PORTS > USB_MAXCHILDREN);
309 width = desc->bNbrPorts / 8 + 1;
310 desc->bDescLength = USB_DT_HUB_NONVAR_SIZE + 2 * width;
311 memset(&desc->u.hs.DeviceRemovable[0], 0, width);
312 memset(&desc->u.hs.DeviceRemovable[width], 0xff, width);
313}
314
315static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
316 u16 wIndex, char *buf, u16 wLength)
317{
318 struct vhci_hcd *vhci_hcd;
319 struct vhci *vhci;
320 int retval = 0;
321 int rhport = -1;
322 unsigned long flags;
323 bool invalid_rhport = false;
324
325 u32 prev_port_status[VHCI_HC_PORTS];
326
327 if (!HCD_HW_ACCESSIBLE(hcd))
328 return -ETIMEDOUT;
329
330 /*
331 * NOTE:
332 * wIndex (bits 0-7) shows the port number and begins from 1?
333 */
334 wIndex = ((__u8)(wIndex & 0x00ff));
335 usbip_dbg_vhci_rh("typeReq %x wValue %x wIndex %x\n", typeReq, wValue,
336 wIndex);
337
338 /*
339 * wIndex can be 0 for some request types (typeReq). rhport is
340 * in valid range when wIndex >= 1 and < VHCI_HC_PORTS.
341 *
342 * Reference port_status[] only with valid rhport when
343 * invalid_rhport is false.
344 */
345 if (wIndex < 1 || wIndex > VHCI_HC_PORTS) {
346 invalid_rhport = true;
347 if (wIndex > VHCI_HC_PORTS)
348 pr_err("invalid port number %d\n", wIndex);
349 } else
350 rhport = wIndex - 1;
351
352 vhci_hcd = hcd_to_vhci_hcd(hcd);
353 vhci = vhci_hcd->vhci;
354
355 spin_lock_irqsave(&vhci->lock, flags);
356
357 /* store old status and compare now and old later */
358 if (usbip_dbg_flag_vhci_rh) {
359 if (!invalid_rhport)
360 memcpy(prev_port_status, vhci_hcd->port_status,
361 sizeof(prev_port_status));
362 }
363
364 switch (typeReq) {
365 case ClearHubFeature:
366 usbip_dbg_vhci_rh(" ClearHubFeature\n");
367 break;
368 case ClearPortFeature:
369 if (invalid_rhport) {
370 pr_err("invalid port number %d\n", wIndex);
371 goto error;
372 }
373 switch (wValue) {
374 case USB_PORT_FEAT_SUSPEND:
375 if (hcd->speed == HCD_USB3) {
376 pr_err(" ClearPortFeature: USB_PORT_FEAT_SUSPEND req not "
377 "supported for USB 3.0 roothub\n");
378 goto error;
379 }
380 usbip_dbg_vhci_rh(
381 " ClearPortFeature: USB_PORT_FEAT_SUSPEND\n");
382 if (vhci_hcd->port_status[rhport] & USB_PORT_STAT_SUSPEND) {
383 /* 20msec signaling */
384 vhci_hcd->resuming = 1;
385 vhci_hcd->re_timeout = jiffies + msecs_to_jiffies(20);
386 }
387 break;
388 case USB_PORT_FEAT_POWER:
389 usbip_dbg_vhci_rh(
390 " ClearPortFeature: USB_PORT_FEAT_POWER\n");
391 if (hcd->speed == HCD_USB3)
392 vhci_hcd->port_status[rhport] &= ~USB_SS_PORT_STAT_POWER;
393 else
394 vhci_hcd->port_status[rhport] &= ~USB_PORT_STAT_POWER;
395 break;
396 default:
397 usbip_dbg_vhci_rh(" ClearPortFeature: default %x\n",
398 wValue);
399 if (wValue >= 32)
400 goto error;
401 vhci_hcd->port_status[rhport] &= ~(1 << wValue);
402 break;
403 }
404 break;
405 case GetHubDescriptor:
406 usbip_dbg_vhci_rh(" GetHubDescriptor\n");
407 if (hcd->speed == HCD_USB3 &&
408 (wLength < USB_DT_SS_HUB_SIZE ||
409 wValue != (USB_DT_SS_HUB << 8))) {
410 pr_err("Wrong hub descriptor type for USB 3.0 roothub.\n");
411 goto error;
412 }
413 if (hcd->speed == HCD_USB3)
414 ss_hub_descriptor((struct usb_hub_descriptor *) buf);
415 else
416 hub_descriptor((struct usb_hub_descriptor *) buf);
417 break;
418 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
419 if (hcd->speed != HCD_USB3)
420 goto error;
421
422 if ((wValue >> 8) != USB_DT_BOS)
423 goto error;
424
425 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc));
426 retval = sizeof(usb3_bos_desc);
427 break;
428 case GetHubStatus:
429 usbip_dbg_vhci_rh(" GetHubStatus\n");
430 *(__le32 *) buf = cpu_to_le32(0);
431 break;
432 case GetPortStatus:
433 usbip_dbg_vhci_rh(" GetPortStatus port %x\n", wIndex);
434 if (invalid_rhport) {
435 pr_err("invalid port number %d\n", wIndex);
436 retval = -EPIPE;
437 goto error;
438 }
439
440 /* we do not care about resume. */
441
442 /* whoever resets or resumes must GetPortStatus to
443 * complete it!!
444 */
445 if (vhci_hcd->resuming && time_after(jiffies, vhci_hcd->re_timeout)) {
446 vhci_hcd->port_status[rhport] |= (1 << USB_PORT_FEAT_C_SUSPEND);
447 vhci_hcd->port_status[rhport] &= ~(1 << USB_PORT_FEAT_SUSPEND);
448 vhci_hcd->resuming = 0;
449 vhci_hcd->re_timeout = 0;
450 }
451
452 if ((vhci_hcd->port_status[rhport] & (1 << USB_PORT_FEAT_RESET)) !=
453 0 && time_after(jiffies, vhci_hcd->re_timeout)) {
454 vhci_hcd->port_status[rhport] |= (1 << USB_PORT_FEAT_C_RESET);
455 vhci_hcd->port_status[rhport] &= ~(1 << USB_PORT_FEAT_RESET);
456 vhci_hcd->re_timeout = 0;
457
458 /*
459 * A few drivers do usb reset during probe when
460 * the device could be in VDEV_ST_USED state
461 */
462 if (vhci_hcd->vdev[rhport].ud.status ==
463 VDEV_ST_NOTASSIGNED ||
464 vhci_hcd->vdev[rhport].ud.status ==
465 VDEV_ST_USED) {
466 usbip_dbg_vhci_rh(
467 " enable rhport %d (status %u)\n",
468 rhport,
469 vhci_hcd->vdev[rhport].ud.status);
470 vhci_hcd->port_status[rhport] |=
471 USB_PORT_STAT_ENABLE;
472 }
473
474 if (hcd->speed < HCD_USB3) {
475 switch (vhci_hcd->vdev[rhport].speed) {
476 case USB_SPEED_HIGH:
477 vhci_hcd->port_status[rhport] |=
478 USB_PORT_STAT_HIGH_SPEED;
479 break;
480 case USB_SPEED_LOW:
481 vhci_hcd->port_status[rhport] |=
482 USB_PORT_STAT_LOW_SPEED;
483 break;
484 default:
485 pr_err("vhci_device speed not set\n");
486 break;
487 }
488 }
489 }
490 ((__le16 *) buf)[0] = cpu_to_le16(vhci_hcd->port_status[rhport]);
491 ((__le16 *) buf)[1] =
492 cpu_to_le16(vhci_hcd->port_status[rhport] >> 16);
493
494 usbip_dbg_vhci_rh(" GetPortStatus bye %x %x\n", ((u16 *)buf)[0],
495 ((u16 *)buf)[1]);
496 break;
497 case SetHubFeature:
498 usbip_dbg_vhci_rh(" SetHubFeature\n");
499 retval = -EPIPE;
500 break;
501 case SetPortFeature:
502 switch (wValue) {
503 case USB_PORT_FEAT_LINK_STATE:
504 usbip_dbg_vhci_rh(
505 " SetPortFeature: USB_PORT_FEAT_LINK_STATE\n");
506 if (hcd->speed != HCD_USB3) {
507 pr_err("USB_PORT_FEAT_LINK_STATE req not "
508 "supported for USB 2.0 roothub\n");
509 goto error;
510 }
511 /*
512 * Since this is dummy we don't have an actual link so
513 * there is nothing to do for the SET_LINK_STATE cmd
514 */
515 break;
516 case USB_PORT_FEAT_U1_TIMEOUT:
517 usbip_dbg_vhci_rh(
518 " SetPortFeature: USB_PORT_FEAT_U1_TIMEOUT\n");
519 fallthrough;
520 case USB_PORT_FEAT_U2_TIMEOUT:
521 usbip_dbg_vhci_rh(
522 " SetPortFeature: USB_PORT_FEAT_U2_TIMEOUT\n");
523 /* TODO: add suspend/resume support! */
524 if (hcd->speed != HCD_USB3) {
525 pr_err("USB_PORT_FEAT_U1/2_TIMEOUT req not "
526 "supported for USB 2.0 roothub\n");
527 goto error;
528 }
529 break;
530 case USB_PORT_FEAT_SUSPEND:
531 usbip_dbg_vhci_rh(
532 " SetPortFeature: USB_PORT_FEAT_SUSPEND\n");
533 /* Applicable only for USB2.0 hub */
534 if (hcd->speed == HCD_USB3) {
535 pr_err("USB_PORT_FEAT_SUSPEND req not "
536 "supported for USB 3.0 roothub\n");
537 goto error;
538 }
539
540 if (invalid_rhport) {
541 pr_err("invalid port number %d\n", wIndex);
542 goto error;
543 }
544
545 vhci_hcd->port_status[rhport] |= USB_PORT_STAT_SUSPEND;
546 break;
547 case USB_PORT_FEAT_POWER:
548 usbip_dbg_vhci_rh(
549 " SetPortFeature: USB_PORT_FEAT_POWER\n");
550 if (invalid_rhport) {
551 pr_err("invalid port number %d\n", wIndex);
552 goto error;
553 }
554 if (hcd->speed == HCD_USB3)
555 vhci_hcd->port_status[rhport] |= USB_SS_PORT_STAT_POWER;
556 else
557 vhci_hcd->port_status[rhport] |= USB_PORT_STAT_POWER;
558 break;
559 case USB_PORT_FEAT_BH_PORT_RESET:
560 usbip_dbg_vhci_rh(
561 " SetPortFeature: USB_PORT_FEAT_BH_PORT_RESET\n");
562 if (invalid_rhport) {
563 pr_err("invalid port number %d\n", wIndex);
564 goto error;
565 }
566 /* Applicable only for USB3.0 hub */
567 if (hcd->speed != HCD_USB3) {
568 pr_err("USB_PORT_FEAT_BH_PORT_RESET req not "
569 "supported for USB 2.0 roothub\n");
570 goto error;
571 }
572 fallthrough;
573 case USB_PORT_FEAT_RESET:
574 usbip_dbg_vhci_rh(
575 " SetPortFeature: USB_PORT_FEAT_RESET\n");
576 if (invalid_rhport) {
577 pr_err("invalid port number %d\n", wIndex);
578 goto error;
579 }
580 /* if it's already enabled, disable */
581 if (hcd->speed == HCD_USB3) {
582 vhci_hcd->port_status[rhport] = 0;
583 vhci_hcd->port_status[rhport] =
584 (USB_SS_PORT_STAT_POWER |
585 USB_PORT_STAT_CONNECTION |
586 USB_PORT_STAT_RESET);
587 } else if (vhci_hcd->port_status[rhport] & USB_PORT_STAT_ENABLE) {
588 vhci_hcd->port_status[rhport] &= ~(USB_PORT_STAT_ENABLE
589 | USB_PORT_STAT_LOW_SPEED
590 | USB_PORT_STAT_HIGH_SPEED);
591 }
592
593 /* 50msec reset signaling */
594 vhci_hcd->re_timeout = jiffies + msecs_to_jiffies(50);
595 fallthrough;
596 default:
597 usbip_dbg_vhci_rh(" SetPortFeature: default %d\n",
598 wValue);
599 if (invalid_rhport) {
600 pr_err("invalid port number %d\n", wIndex);
601 goto error;
602 }
603 if (wValue >= 32)
604 goto error;
605 if (hcd->speed == HCD_USB3) {
606 if ((vhci_hcd->port_status[rhport] &
607 USB_SS_PORT_STAT_POWER) != 0) {
608 vhci_hcd->port_status[rhport] |= (1 << wValue);
609 }
610 } else
611 if ((vhci_hcd->port_status[rhport] &
612 USB_PORT_STAT_POWER) != 0) {
613 vhci_hcd->port_status[rhport] |= (1 << wValue);
614 }
615 }
616 break;
617 case GetPortErrorCount:
618 usbip_dbg_vhci_rh(" GetPortErrorCount\n");
619 if (hcd->speed != HCD_USB3) {
620 pr_err("GetPortErrorCount req not "
621 "supported for USB 2.0 roothub\n");
622 goto error;
623 }
624 /* We'll always return 0 since this is a dummy hub */
625 *(__le32 *) buf = cpu_to_le32(0);
626 break;
627 case SetHubDepth:
628 usbip_dbg_vhci_rh(" SetHubDepth\n");
629 if (hcd->speed != HCD_USB3) {
630 pr_err("SetHubDepth req not supported for "
631 "USB 2.0 roothub\n");
632 goto error;
633 }
634 break;
635 default:
636 pr_err("default hub control req: %04x v%04x i%04x l%d\n",
637 typeReq, wValue, wIndex, wLength);
638error:
639 /* "protocol stall" on error */
640 retval = -EPIPE;
641 }
642
643 if (usbip_dbg_flag_vhci_rh) {
644 pr_debug("port %d\n", rhport);
645 /* Only dump valid port status */
646 if (!invalid_rhport) {
647 dump_port_status_diff(prev_port_status[rhport],
648 vhci_hcd->port_status[rhport],
649 hcd->speed == HCD_USB3);
650 }
651 }
652 usbip_dbg_vhci_rh(" bye\n");
653
654 spin_unlock_irqrestore(&vhci->lock, flags);
655
656 if (!invalid_rhport &&
657 (vhci_hcd->port_status[rhport] & PORT_C_MASK) != 0) {
658 usb_hcd_poll_rh_status(hcd);
659 }
660
661 return retval;
662}
663
664static void vhci_tx_urb(struct urb *urb, struct vhci_device *vdev)
665{
666 struct vhci_priv *priv;
667 struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev);
668 unsigned long flags;
669
670 priv = kzalloc(sizeof(struct vhci_priv), GFP_ATOMIC);
671 if (!priv) {
672 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
673 return;
674 }
675
676 spin_lock_irqsave(&vdev->priv_lock, flags);
677
678 priv->seqnum = atomic_inc_return(&vhci_hcd->seqnum);
679 if (priv->seqnum == 0xffff)
680 dev_info(&urb->dev->dev, "seqnum max\n");
681
682 priv->vdev = vdev;
683 priv->urb = urb;
684
685 urb->hcpriv = (void *) priv;
686
687 list_add_tail(&priv->list, &vdev->priv_tx);
688
689 wake_up(&vdev->waitq_tx);
690 spin_unlock_irqrestore(&vdev->priv_lock, flags);
691}
692
693static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
694{
695 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
696 struct vhci *vhci = vhci_hcd->vhci;
697 struct device *dev = &urb->dev->dev;
698 u8 portnum = urb->dev->portnum;
699 int ret = 0;
700 struct vhci_device *vdev;
701 unsigned long flags;
702
703 if (portnum > VHCI_HC_PORTS) {
704 pr_err("invalid port number %d\n", portnum);
705 return -ENODEV;
706 }
707 vdev = &vhci_hcd->vdev[portnum-1];
708
709 if (!urb->transfer_buffer && !urb->num_sgs &&
710 urb->transfer_buffer_length) {
711 dev_dbg(dev, "Null URB transfer buffer\n");
712 return -EINVAL;
713 }
714
715 spin_lock_irqsave(&vhci->lock, flags);
716
717 if (urb->status != -EINPROGRESS) {
718 dev_err(dev, "URB already unlinked!, status %d\n", urb->status);
719 spin_unlock_irqrestore(&vhci->lock, flags);
720 return urb->status;
721 }
722
723 /* refuse enqueue for dead connection */
724 spin_lock(&vdev->ud.lock);
725 if (vdev->ud.status == VDEV_ST_NULL ||
726 vdev->ud.status == VDEV_ST_ERROR) {
727 dev_err(dev, "enqueue for inactive port %d\n", vdev->rhport);
728 spin_unlock(&vdev->ud.lock);
729 spin_unlock_irqrestore(&vhci->lock, flags);
730 return -ENODEV;
731 }
732 spin_unlock(&vdev->ud.lock);
733
734 ret = usb_hcd_link_urb_to_ep(hcd, urb);
735 if (ret)
736 goto no_need_unlink;
737
738 /*
739 * The enumeration process is as follows;
740 *
741 * 1. Get_Descriptor request to DevAddrs(0) EndPoint(0)
742 * to get max packet length of default pipe
743 *
744 * 2. Set_Address request to DevAddr(0) EndPoint(0)
745 *
746 */
747 if (usb_pipedevice(urb->pipe) == 0) {
748 __u8 type = usb_pipetype(urb->pipe);
749 struct usb_ctrlrequest *ctrlreq =
750 (struct usb_ctrlrequest *) urb->setup_packet;
751
752 if (type != PIPE_CONTROL || !ctrlreq) {
753 dev_err(dev, "invalid request to devnum 0\n");
754 ret = -EINVAL;
755 goto no_need_xmit;
756 }
757
758 switch (ctrlreq->bRequest) {
759 case USB_REQ_SET_ADDRESS:
760 /* set_address may come when a device is reset */
761 dev_info(dev, "SetAddress Request (%d) to port %d\n",
762 ctrlreq->wValue, vdev->rhport);
763
764 usb_put_dev(vdev->udev);
765 vdev->udev = usb_get_dev(urb->dev);
766
767 spin_lock(&vdev->ud.lock);
768 vdev->ud.status = VDEV_ST_USED;
769 spin_unlock(&vdev->ud.lock);
770
771 if (urb->status == -EINPROGRESS) {
772 /* This request is successfully completed. */
773 /* If not -EINPROGRESS, possibly unlinked. */
774 urb->status = 0;
775 }
776
777 goto no_need_xmit;
778
779 case USB_REQ_GET_DESCRIPTOR:
780 if (ctrlreq->wValue == cpu_to_le16(USB_DT_DEVICE << 8))
781 usbip_dbg_vhci_hc(
782 "Not yet?:Get_Descriptor to device 0 (get max pipe size)\n");
783
784 usb_put_dev(vdev->udev);
785 vdev->udev = usb_get_dev(urb->dev);
786 goto out;
787
788 default:
789 /* NOT REACHED */
790 dev_err(dev,
791 "invalid request to devnum 0 bRequest %u, wValue %u\n",
792 ctrlreq->bRequest,
793 ctrlreq->wValue);
794 ret = -EINVAL;
795 goto no_need_xmit;
796 }
797
798 }
799
800out:
801 vhci_tx_urb(urb, vdev);
802 spin_unlock_irqrestore(&vhci->lock, flags);
803
804 return 0;
805
806no_need_xmit:
807 usb_hcd_unlink_urb_from_ep(hcd, urb);
808no_need_unlink:
809 spin_unlock_irqrestore(&vhci->lock, flags);
810 if (!ret) {
811 /* usb_hcd_giveback_urb() should be called with
812 * irqs disabled
813 */
814 local_irq_disable();
815 usb_hcd_giveback_urb(hcd, urb, urb->status);
816 local_irq_enable();
817 }
818 return ret;
819}
820
821/*
822 * vhci_rx gives back the urb after receiving the reply of the urb. If an
823 * unlink pdu is sent or not, vhci_rx receives a normal return pdu and gives
824 * back its urb. For the driver unlinking the urb, the content of the urb is
825 * not important, but the calling to its completion handler is important; the
826 * completion of unlinking is notified by the completion handler.
827 *
828 *
829 * CLIENT SIDE
830 *
831 * - When vhci_hcd receives RET_SUBMIT,
832 *
833 * - case 1a). the urb of the pdu is not unlinking.
834 * - normal case
835 * => just give back the urb
836 *
837 * - case 1b). the urb of the pdu is unlinking.
838 * - usbip.ko will return a reply of the unlinking request.
839 * => give back the urb now and go to case 2b).
840 *
841 * - When vhci_hcd receives RET_UNLINK,
842 *
843 * - case 2a). a submit request is still pending in vhci_hcd.
844 * - urb was really pending in usbip.ko and urb_unlink_urb() was
845 * completed there.
846 * => free a pending submit request
847 * => notify unlink completeness by giving back the urb
848 *
849 * - case 2b). a submit request is *not* pending in vhci_hcd.
850 * - urb was already given back to the core driver.
851 * => do not give back the urb
852 *
853 *
854 * SERVER SIDE
855 *
856 * - When usbip receives CMD_UNLINK,
857 *
858 * - case 3a). the urb of the unlink request is now in submission.
859 * => do usb_unlink_urb().
860 * => after the unlink is completed, send RET_UNLINK.
861 *
862 * - case 3b). the urb of the unlink request is not in submission.
863 * - may be already completed or never be received
864 * => send RET_UNLINK
865 *
866 */
867static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
868{
869 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
870 struct vhci *vhci = vhci_hcd->vhci;
871 struct vhci_priv *priv;
872 struct vhci_device *vdev;
873 unsigned long flags;
874
875 spin_lock_irqsave(&vhci->lock, flags);
876
877 priv = urb->hcpriv;
878 if (!priv) {
879 /* URB was never linked! or will be soon given back by
880 * vhci_rx. */
881 spin_unlock_irqrestore(&vhci->lock, flags);
882 return -EIDRM;
883 }
884
885 {
886 int ret = 0;
887
888 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
889 if (ret) {
890 spin_unlock_irqrestore(&vhci->lock, flags);
891 return ret;
892 }
893 }
894
895 /* send unlink request here? */
896 vdev = priv->vdev;
897
898 if (!vdev->ud.tcp_socket) {
899 /* tcp connection is closed */
900 spin_lock(&vdev->priv_lock);
901
902 list_del(&priv->list);
903 kfree(priv);
904 urb->hcpriv = NULL;
905
906 spin_unlock(&vdev->priv_lock);
907
908 /*
909 * If tcp connection is alive, we have sent CMD_UNLINK.
910 * vhci_rx will receive RET_UNLINK and give back the URB.
911 * Otherwise, we give back it here.
912 */
913 usb_hcd_unlink_urb_from_ep(hcd, urb);
914
915 spin_unlock_irqrestore(&vhci->lock, flags);
916 usb_hcd_giveback_urb(hcd, urb, urb->status);
917 spin_lock_irqsave(&vhci->lock, flags);
918
919 } else {
920 /* tcp connection is alive */
921 struct vhci_unlink *unlink;
922
923 spin_lock(&vdev->priv_lock);
924
925 /* setup CMD_UNLINK pdu */
926 unlink = kzalloc(sizeof(struct vhci_unlink), GFP_ATOMIC);
927 if (!unlink) {
928 spin_unlock(&vdev->priv_lock);
929 spin_unlock_irqrestore(&vhci->lock, flags);
930 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
931 return -ENOMEM;
932 }
933
934 unlink->seqnum = atomic_inc_return(&vhci_hcd->seqnum);
935 if (unlink->seqnum == 0xffff)
936 pr_info("seqnum max\n");
937
938 unlink->unlink_seqnum = priv->seqnum;
939
940 /* send cmd_unlink and try to cancel the pending URB in the
941 * peer */
942 list_add_tail(&unlink->list, &vdev->unlink_tx);
943 wake_up(&vdev->waitq_tx);
944
945 spin_unlock(&vdev->priv_lock);
946 }
947
948 spin_unlock_irqrestore(&vhci->lock, flags);
949
950 usbip_dbg_vhci_hc("leave\n");
951 return 0;
952}
953
954static void vhci_cleanup_unlink_list(struct vhci_device *vdev,
955 struct list_head *unlink_list)
956{
957 struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev);
958 struct usb_hcd *hcd = vhci_hcd_to_hcd(vhci_hcd);
959 struct vhci *vhci = vhci_hcd->vhci;
960 struct vhci_unlink *unlink, *tmp;
961 unsigned long flags;
962
963 spin_lock_irqsave(&vhci->lock, flags);
964 spin_lock(&vdev->priv_lock);
965
966 list_for_each_entry_safe(unlink, tmp, unlink_list, list) {
967 struct urb *urb;
968
969 urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
970 if (!urb) {
971 list_del(&unlink->list);
972 kfree(unlink);
973 continue;
974 }
975
976 urb->status = -ENODEV;
977
978 usb_hcd_unlink_urb_from_ep(hcd, urb);
979
980 list_del(&unlink->list);
981
982 spin_unlock(&vdev->priv_lock);
983 spin_unlock_irqrestore(&vhci->lock, flags);
984
985 usb_hcd_giveback_urb(hcd, urb, urb->status);
986
987 spin_lock_irqsave(&vhci->lock, flags);
988 spin_lock(&vdev->priv_lock);
989
990 kfree(unlink);
991 }
992
993 spin_unlock(&vdev->priv_lock);
994 spin_unlock_irqrestore(&vhci->lock, flags);
995}
996
997static void vhci_device_unlink_cleanup(struct vhci_device *vdev)
998{
999 /* give back URB of unsent unlink request */
1000 vhci_cleanup_unlink_list(vdev, &vdev->unlink_tx);
1001
1002 /* give back URB of unanswered unlink request */
1003 vhci_cleanup_unlink_list(vdev, &vdev->unlink_rx);
1004}
1005
1006/*
1007 * The important thing is that only one context begins cleanup.
1008 * This is why error handling and cleanup become simple.
1009 * We do not want to consider race condition as possible.
1010 */
1011static void vhci_shutdown_connection(struct usbip_device *ud)
1012{
1013 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
1014
1015 /* need this? see stub_dev.c */
1016 if (ud->tcp_socket) {
1017 pr_debug("shutdown tcp_socket %d\n", ud->sockfd);
1018 kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR);
1019 }
1020
1021 /* kill threads related to this sdev */
1022 if (vdev->ud.tcp_rx) {
1023 kthread_stop_put(vdev->ud.tcp_rx);
1024 vdev->ud.tcp_rx = NULL;
1025 }
1026 if (vdev->ud.tcp_tx) {
1027 kthread_stop_put(vdev->ud.tcp_tx);
1028 vdev->ud.tcp_tx = NULL;
1029 }
1030 pr_info("stop threads\n");
1031
1032 /* active connection is closed */
1033 if (vdev->ud.tcp_socket) {
1034 sockfd_put(vdev->ud.tcp_socket);
1035 vdev->ud.tcp_socket = NULL;
1036 vdev->ud.sockfd = -1;
1037 }
1038 pr_info("release socket\n");
1039
1040 vhci_device_unlink_cleanup(vdev);
1041
1042 /*
1043 * rh_port_disconnect() is a trigger of ...
1044 * usb_disable_device():
1045 * disable all the endpoints for a USB device.
1046 * usb_disable_endpoint():
1047 * disable endpoints. pending urbs are unlinked(dequeued).
1048 *
1049 * NOTE: After calling rh_port_disconnect(), the USB device drivers of a
1050 * detached device should release used urbs in a cleanup function (i.e.
1051 * xxx_disconnect()). Therefore, vhci_hcd does not need to release
1052 * pushed urbs and their private data in this function.
1053 *
1054 * NOTE: vhci_dequeue() must be considered carefully. When shutting down
1055 * a connection, vhci_shutdown_connection() expects vhci_dequeue()
1056 * gives back pushed urbs and frees their private data by request of
1057 * the cleanup function of a USB driver. When unlinking a urb with an
1058 * active connection, vhci_dequeue() does not give back the urb which
1059 * is actually given back by vhci_rx after receiving its return pdu.
1060 *
1061 */
1062 rh_port_disconnect(vdev);
1063
1064 pr_info("disconnect device\n");
1065}
1066
1067static void vhci_device_reset(struct usbip_device *ud)
1068{
1069 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
1070 unsigned long flags;
1071
1072 spin_lock_irqsave(&ud->lock, flags);
1073
1074 vdev->speed = 0;
1075 vdev->devid = 0;
1076
1077 usb_put_dev(vdev->udev);
1078 vdev->udev = NULL;
1079
1080 if (ud->tcp_socket) {
1081 sockfd_put(ud->tcp_socket);
1082 ud->tcp_socket = NULL;
1083 ud->sockfd = -1;
1084 }
1085 ud->status = VDEV_ST_NULL;
1086
1087 spin_unlock_irqrestore(&ud->lock, flags);
1088}
1089
1090static void vhci_device_unusable(struct usbip_device *ud)
1091{
1092 unsigned long flags;
1093
1094 spin_lock_irqsave(&ud->lock, flags);
1095 ud->status = VDEV_ST_ERROR;
1096 spin_unlock_irqrestore(&ud->lock, flags);
1097}
1098
1099static void vhci_device_init(struct vhci_device *vdev)
1100{
1101 memset(vdev, 0, sizeof(struct vhci_device));
1102
1103 vdev->ud.side = USBIP_VHCI;
1104 vdev->ud.status = VDEV_ST_NULL;
1105 spin_lock_init(&vdev->ud.lock);
1106 mutex_init(&vdev->ud.sysfs_lock);
1107
1108 INIT_LIST_HEAD(&vdev->priv_rx);
1109 INIT_LIST_HEAD(&vdev->priv_tx);
1110 INIT_LIST_HEAD(&vdev->unlink_tx);
1111 INIT_LIST_HEAD(&vdev->unlink_rx);
1112 spin_lock_init(&vdev->priv_lock);
1113
1114 init_waitqueue_head(&vdev->waitq_tx);
1115
1116 vdev->ud.eh_ops.shutdown = vhci_shutdown_connection;
1117 vdev->ud.eh_ops.reset = vhci_device_reset;
1118 vdev->ud.eh_ops.unusable = vhci_device_unusable;
1119
1120 usbip_start_eh(&vdev->ud);
1121}
1122
1123static int hcd_name_to_id(const char *name)
1124{
1125 char *c;
1126 long val;
1127 int ret;
1128
1129 c = strchr(name, '.');
1130 if (c == NULL)
1131 return 0;
1132
1133 ret = kstrtol(c+1, 10, &val);
1134 if (ret < 0)
1135 return ret;
1136
1137 return val;
1138}
1139
1140static int vhci_setup(struct usb_hcd *hcd)
1141{
1142 struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller));
1143
1144 if (usb_hcd_is_primary_hcd(hcd)) {
1145 vhci->vhci_hcd_hs = hcd_to_vhci_hcd(hcd);
1146 vhci->vhci_hcd_hs->vhci = vhci;
1147 /*
1148 * Mark the first roothub as being USB 2.0.
1149 * The USB 3.0 roothub will be registered later by
1150 * vhci_hcd_probe()
1151 */
1152 hcd->speed = HCD_USB2;
1153 hcd->self.root_hub->speed = USB_SPEED_HIGH;
1154 } else {
1155 vhci->vhci_hcd_ss = hcd_to_vhci_hcd(hcd);
1156 vhci->vhci_hcd_ss->vhci = vhci;
1157 hcd->speed = HCD_USB3;
1158 hcd->self.root_hub->speed = USB_SPEED_SUPER;
1159 }
1160
1161 /*
1162 * Support SG.
1163 * sg_tablesize is an arbitrary value to alleviate memory pressure
1164 * on the host.
1165 */
1166 hcd->self.sg_tablesize = 32;
1167 hcd->self.no_sg_constraint = 1;
1168
1169 return 0;
1170}
1171
1172static int vhci_start(struct usb_hcd *hcd)
1173{
1174 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
1175 int id, rhport;
1176 int err;
1177
1178 usbip_dbg_vhci_hc("enter vhci_start\n");
1179
1180 if (usb_hcd_is_primary_hcd(hcd))
1181 spin_lock_init(&vhci_hcd->vhci->lock);
1182
1183 /* initialize private data of usb_hcd */
1184
1185 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
1186 struct vhci_device *vdev = &vhci_hcd->vdev[rhport];
1187
1188 vhci_device_init(vdev);
1189 vdev->rhport = rhport;
1190 }
1191
1192 atomic_set(&vhci_hcd->seqnum, 0);
1193
1194 hcd->power_budget = 0; /* no limit */
1195 hcd->uses_new_polling = 1;
1196
1197#ifdef CONFIG_USB_OTG
1198 hcd->self.otg_port = 1;
1199#endif
1200
1201 id = hcd_name_to_id(hcd_name(hcd));
1202 if (id < 0) {
1203 pr_err("invalid vhci name %s\n", hcd_name(hcd));
1204 return -EINVAL;
1205 }
1206
1207 /* vhci_hcd is now ready to be controlled through sysfs */
1208 if (id == 0 && usb_hcd_is_primary_hcd(hcd)) {
1209 err = vhci_init_attr_group();
1210 if (err) {
1211 dev_err(hcd_dev(hcd), "init attr group failed, err = %d\n", err);
1212 return err;
1213 }
1214 err = sysfs_create_group(&hcd_dev(hcd)->kobj, &vhci_attr_group);
1215 if (err) {
1216 dev_err(hcd_dev(hcd), "create sysfs files failed, err = %d\n", err);
1217 vhci_finish_attr_group();
1218 return err;
1219 }
1220 pr_info("created sysfs %s\n", hcd_name(hcd));
1221 }
1222
1223 return 0;
1224}
1225
1226static void vhci_stop(struct usb_hcd *hcd)
1227{
1228 struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
1229 int id, rhport;
1230
1231 usbip_dbg_vhci_hc("stop VHCI controller\n");
1232
1233 /* 1. remove the userland interface of vhci_hcd */
1234 id = hcd_name_to_id(hcd_name(hcd));
1235 if (id == 0 && usb_hcd_is_primary_hcd(hcd)) {
1236 sysfs_remove_group(&hcd_dev(hcd)->kobj, &vhci_attr_group);
1237 vhci_finish_attr_group();
1238 }
1239
1240 /* 2. shutdown all the ports of vhci_hcd */
1241 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
1242 struct vhci_device *vdev = &vhci_hcd->vdev[rhport];
1243
1244 usbip_event_add(&vdev->ud, VDEV_EVENT_REMOVED);
1245 usbip_stop_eh(&vdev->ud);
1246 }
1247}
1248
1249static int vhci_get_frame_number(struct usb_hcd *hcd)
1250{
1251 dev_err_ratelimited(&hcd->self.root_hub->dev, "Not yet implemented\n");
1252 return 0;
1253}
1254
1255#ifdef CONFIG_PM
1256
1257/* FIXME: suspend/resume */
1258static int vhci_bus_suspend(struct usb_hcd *hcd)
1259{
1260 struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller));
1261 unsigned long flags;
1262
1263 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1264
1265 spin_lock_irqsave(&vhci->lock, flags);
1266 hcd->state = HC_STATE_SUSPENDED;
1267 spin_unlock_irqrestore(&vhci->lock, flags);
1268
1269 return 0;
1270}
1271
1272static int vhci_bus_resume(struct usb_hcd *hcd)
1273{
1274 struct vhci *vhci = *((void **)dev_get_platdata(hcd->self.controller));
1275 int rc = 0;
1276 unsigned long flags;
1277
1278 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1279
1280 spin_lock_irqsave(&vhci->lock, flags);
1281 if (!HCD_HW_ACCESSIBLE(hcd))
1282 rc = -ESHUTDOWN;
1283 else
1284 hcd->state = HC_STATE_RUNNING;
1285 spin_unlock_irqrestore(&vhci->lock, flags);
1286
1287 return rc;
1288}
1289
1290#else
1291
1292#define vhci_bus_suspend NULL
1293#define vhci_bus_resume NULL
1294#endif
1295
1296/* Change a group of bulk endpoints to support multiple stream IDs */
1297static int vhci_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
1298 struct usb_host_endpoint **eps, unsigned int num_eps,
1299 unsigned int num_streams, gfp_t mem_flags)
1300{
1301 dev_dbg(&hcd->self.root_hub->dev, "vhci_alloc_streams not implemented\n");
1302 return 0;
1303}
1304
1305/* Reverts a group of bulk endpoints back to not using stream IDs. */
1306static int vhci_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
1307 struct usb_host_endpoint **eps, unsigned int num_eps,
1308 gfp_t mem_flags)
1309{
1310 dev_dbg(&hcd->self.root_hub->dev, "vhci_free_streams not implemented\n");
1311 return 0;
1312}
1313
1314static const struct hc_driver vhci_hc_driver = {
1315 .description = driver_name,
1316 .product_desc = driver_desc,
1317 .hcd_priv_size = sizeof(struct vhci_hcd),
1318
1319 .flags = HCD_USB3 | HCD_SHARED,
1320
1321 .reset = vhci_setup,
1322 .start = vhci_start,
1323 .stop = vhci_stop,
1324
1325 .urb_enqueue = vhci_urb_enqueue,
1326 .urb_dequeue = vhci_urb_dequeue,
1327
1328 .get_frame_number = vhci_get_frame_number,
1329
1330 .hub_status_data = vhci_hub_status,
1331 .hub_control = vhci_hub_control,
1332 .bus_suspend = vhci_bus_suspend,
1333 .bus_resume = vhci_bus_resume,
1334
1335 .alloc_streams = vhci_alloc_streams,
1336 .free_streams = vhci_free_streams,
1337};
1338
1339static int vhci_hcd_probe(struct platform_device *pdev)
1340{
1341 struct vhci *vhci = *((void **)dev_get_platdata(&pdev->dev));
1342 struct usb_hcd *hcd_hs;
1343 struct usb_hcd *hcd_ss;
1344 int ret;
1345
1346 usbip_dbg_vhci_hc("name %s id %d\n", pdev->name, pdev->id);
1347
1348 /*
1349 * Allocate and initialize hcd.
1350 * Our private data is also allocated automatically.
1351 */
1352 hcd_hs = usb_create_hcd(&vhci_hc_driver, &pdev->dev, dev_name(&pdev->dev));
1353 if (!hcd_hs) {
1354 pr_err("create primary hcd failed\n");
1355 return -ENOMEM;
1356 }
1357 hcd_hs->has_tt = 1;
1358
1359 /*
1360 * Finish generic HCD structure initialization and register.
1361 * Call the driver's reset() and start() routines.
1362 */
1363 ret = usb_add_hcd(hcd_hs, 0, 0);
1364 if (ret != 0) {
1365 pr_err("usb_add_hcd hs failed %d\n", ret);
1366 goto put_usb2_hcd;
1367 }
1368
1369 hcd_ss = usb_create_shared_hcd(&vhci_hc_driver, &pdev->dev,
1370 dev_name(&pdev->dev), hcd_hs);
1371 if (!hcd_ss) {
1372 ret = -ENOMEM;
1373 pr_err("create shared hcd failed\n");
1374 goto remove_usb2_hcd;
1375 }
1376
1377 ret = usb_add_hcd(hcd_ss, 0, 0);
1378 if (ret) {
1379 pr_err("usb_add_hcd ss failed %d\n", ret);
1380 goto put_usb3_hcd;
1381 }
1382
1383 usbip_dbg_vhci_hc("bye\n");
1384 return 0;
1385
1386put_usb3_hcd:
1387 usb_put_hcd(hcd_ss);
1388remove_usb2_hcd:
1389 usb_remove_hcd(hcd_hs);
1390put_usb2_hcd:
1391 usb_put_hcd(hcd_hs);
1392 vhci->vhci_hcd_hs = NULL;
1393 vhci->vhci_hcd_ss = NULL;
1394 return ret;
1395}
1396
1397static void vhci_hcd_remove(struct platform_device *pdev)
1398{
1399 struct vhci *vhci = *((void **)dev_get_platdata(&pdev->dev));
1400
1401 /*
1402 * Disconnects the root hub,
1403 * then reverses the effects of usb_add_hcd(),
1404 * invoking the HCD's stop() methods.
1405 */
1406 usb_remove_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_ss));
1407 usb_put_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_ss));
1408
1409 usb_remove_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_hs));
1410 usb_put_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_hs));
1411
1412 vhci->vhci_hcd_hs = NULL;
1413 vhci->vhci_hcd_ss = NULL;
1414}
1415
1416#ifdef CONFIG_PM
1417
1418/* what should happen for USB/IP under suspend/resume? */
1419static int vhci_hcd_suspend(struct platform_device *pdev, pm_message_t state)
1420{
1421 struct usb_hcd *hcd;
1422 struct vhci *vhci;
1423 int rhport;
1424 int connected = 0;
1425 int ret = 0;
1426 unsigned long flags;
1427
1428 dev_dbg(&pdev->dev, "%s\n", __func__);
1429
1430 hcd = platform_get_drvdata(pdev);
1431 if (!hcd)
1432 return 0;
1433
1434 vhci = *((void **)dev_get_platdata(hcd->self.controller));
1435
1436 spin_lock_irqsave(&vhci->lock, flags);
1437
1438 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
1439 if (vhci->vhci_hcd_hs->port_status[rhport] &
1440 USB_PORT_STAT_CONNECTION)
1441 connected += 1;
1442
1443 if (vhci->vhci_hcd_ss->port_status[rhport] &
1444 USB_PORT_STAT_CONNECTION)
1445 connected += 1;
1446 }
1447
1448 spin_unlock_irqrestore(&vhci->lock, flags);
1449
1450 if (connected > 0) {
1451 dev_info(&pdev->dev,
1452 "We have %d active connection%s. Do not suspend.\n",
1453 connected, (connected == 1 ? "" : "s"));
1454 ret = -EBUSY;
1455 } else {
1456 dev_info(&pdev->dev, "suspend vhci_hcd");
1457 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1458 }
1459
1460 return ret;
1461}
1462
1463static int vhci_hcd_resume(struct platform_device *pdev)
1464{
1465 struct usb_hcd *hcd;
1466
1467 dev_dbg(&pdev->dev, "%s\n", __func__);
1468
1469 hcd = platform_get_drvdata(pdev);
1470 if (!hcd)
1471 return 0;
1472 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1473 usb_hcd_poll_rh_status(hcd);
1474
1475 return 0;
1476}
1477
1478#else
1479
1480#define vhci_hcd_suspend NULL
1481#define vhci_hcd_resume NULL
1482
1483#endif
1484
1485static struct platform_driver vhci_driver = {
1486 .probe = vhci_hcd_probe,
1487 .remove_new = vhci_hcd_remove,
1488 .suspend = vhci_hcd_suspend,
1489 .resume = vhci_hcd_resume,
1490 .driver = {
1491 .name = driver_name,
1492 },
1493};
1494
1495static void del_platform_devices(void)
1496{
1497 int i;
1498
1499 for (i = 0; i < vhci_num_controllers; i++) {
1500 platform_device_unregister(vhcis[i].pdev);
1501 vhcis[i].pdev = NULL;
1502 }
1503 sysfs_remove_link(&platform_bus.kobj, driver_name);
1504}
1505
1506static int __init vhci_hcd_init(void)
1507{
1508 int i, ret;
1509
1510 if (usb_disabled())
1511 return -ENODEV;
1512
1513 if (vhci_num_controllers < 1)
1514 vhci_num_controllers = 1;
1515
1516 vhcis = kcalloc(vhci_num_controllers, sizeof(struct vhci), GFP_KERNEL);
1517 if (vhcis == NULL)
1518 return -ENOMEM;
1519
1520 ret = platform_driver_register(&vhci_driver);
1521 if (ret)
1522 goto err_driver_register;
1523
1524 for (i = 0; i < vhci_num_controllers; i++) {
1525 void *vhci = &vhcis[i];
1526 struct platform_device_info pdevinfo = {
1527 .name = driver_name,
1528 .id = i,
1529 .data = &vhci,
1530 .size_data = sizeof(void *),
1531 };
1532
1533 vhcis[i].pdev = platform_device_register_full(&pdevinfo);
1534 ret = PTR_ERR_OR_ZERO(vhcis[i].pdev);
1535 if (ret < 0) {
1536 while (i--)
1537 platform_device_unregister(vhcis[i].pdev);
1538 goto err_add_hcd;
1539 }
1540 }
1541
1542 return 0;
1543
1544err_add_hcd:
1545 platform_driver_unregister(&vhci_driver);
1546err_driver_register:
1547 kfree(vhcis);
1548 return ret;
1549}
1550
1551static void __exit vhci_hcd_exit(void)
1552{
1553 del_platform_devices();
1554 platform_driver_unregister(&vhci_driver);
1555 kfree(vhcis);
1556}
1557
1558module_init(vhci_hcd_init);
1559module_exit(vhci_hcd_exit);
1560
1561MODULE_AUTHOR(DRIVER_AUTHOR);
1562MODULE_DESCRIPTION(DRIVER_DESC);
1563MODULE_LICENSE("GPL");
1/*
2 * Copyright (C) 2003-2008 Takahiro Hirofuchi
3 * Copyright (C) 2015-2016 Nobuo Iwata
4 *
5 * This is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
18 * USA.
19 */
20
21#include <linux/init.h>
22#include <linux/file.h>
23#include <linux/kernel.h>
24#include <linux/kthread.h>
25#include <linux/module.h>
26#include <linux/platform_device.h>
27#include <linux/slab.h>
28
29#include "usbip_common.h"
30#include "vhci.h"
31
32#define DRIVER_AUTHOR "Takahiro Hirofuchi"
33#define DRIVER_DESC "USB/IP 'Virtual' Host Controller (VHCI) Driver"
34
35/*
36 * TODO
37 * - update root hub emulation
38 * - move the emulation code to userland ?
39 * porting to other operating systems
40 * minimize kernel code
41 * - add suspend/resume code
42 * - clean up everything
43 */
44
45/* See usb gadget dummy hcd */
46
47static int vhci_hub_status(struct usb_hcd *hcd, char *buff);
48static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
49 u16 wIndex, char *buff, u16 wLength);
50static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
51 gfp_t mem_flags);
52static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status);
53static int vhci_start(struct usb_hcd *vhci_hcd);
54static void vhci_stop(struct usb_hcd *hcd);
55static int vhci_get_frame_number(struct usb_hcd *hcd);
56
57static const char driver_name[] = "vhci_hcd";
58static const char driver_desc[] = "USB/IP Virtual Host Controller";
59
60int vhci_num_controllers = VHCI_NR_HCS;
61
62struct platform_device **vhci_pdevs;
63
64static const char * const bit_desc[] = {
65 "CONNECTION", /*0*/
66 "ENABLE", /*1*/
67 "SUSPEND", /*2*/
68 "OVER_CURRENT", /*3*/
69 "RESET", /*4*/
70 "R5", /*5*/
71 "R6", /*6*/
72 "R7", /*7*/
73 "POWER", /*8*/
74 "LOWSPEED", /*9*/
75 "HIGHSPEED", /*10*/
76 "PORT_TEST", /*11*/
77 "INDICATOR", /*12*/
78 "R13", /*13*/
79 "R14", /*14*/
80 "R15", /*15*/
81 "C_CONNECTION", /*16*/
82 "C_ENABLE", /*17*/
83 "C_SUSPEND", /*18*/
84 "C_OVER_CURRENT", /*19*/
85 "C_RESET", /*20*/
86 "R21", /*21*/
87 "R22", /*22*/
88 "R23", /*23*/
89 "R24", /*24*/
90 "R25", /*25*/
91 "R26", /*26*/
92 "R27", /*27*/
93 "R28", /*28*/
94 "R29", /*29*/
95 "R30", /*30*/
96 "R31", /*31*/
97};
98
99static void dump_port_status_diff(u32 prev_status, u32 new_status)
100{
101 int i = 0;
102 u32 bit = 1;
103
104 pr_debug("status prev -> new: %08x -> %08x\n", prev_status, new_status);
105 while (bit) {
106 u32 prev = prev_status & bit;
107 u32 new = new_status & bit;
108 char change;
109
110 if (!prev && new)
111 change = '+';
112 else if (prev && !new)
113 change = '-';
114 else
115 change = ' ';
116
117 if (prev || new)
118 pr_debug(" %c%s\n", change, bit_desc[i]);
119 bit <<= 1;
120 i++;
121 }
122 pr_debug("\n");
123}
124
125void rh_port_connect(struct vhci_device *vdev, enum usb_device_speed speed)
126{
127 struct vhci_hcd *vhci = vdev_to_vhci(vdev);
128 int rhport = vdev->rhport;
129 u32 status;
130 unsigned long flags;
131
132 usbip_dbg_vhci_rh("rh_port_connect %d\n", rhport);
133
134 spin_lock_irqsave(&vhci->lock, flags);
135
136 status = vhci->port_status[rhport];
137
138 status |= USB_PORT_STAT_CONNECTION | (1 << USB_PORT_FEAT_C_CONNECTION);
139
140 switch (speed) {
141 case USB_SPEED_HIGH:
142 status |= USB_PORT_STAT_HIGH_SPEED;
143 break;
144 case USB_SPEED_LOW:
145 status |= USB_PORT_STAT_LOW_SPEED;
146 break;
147 default:
148 break;
149 }
150
151 vhci->port_status[rhport] = status;
152
153 spin_unlock_irqrestore(&vhci->lock, flags);
154
155 usb_hcd_poll_rh_status(vhci_to_hcd(vhci));
156}
157
158static void rh_port_disconnect(struct vhci_device *vdev)
159{
160 struct vhci_hcd *vhci = vdev_to_vhci(vdev);
161 int rhport = vdev->rhport;
162 u32 status;
163 unsigned long flags;
164
165 usbip_dbg_vhci_rh("rh_port_disconnect %d\n", rhport);
166
167 spin_lock_irqsave(&vhci->lock, flags);
168
169 status = vhci->port_status[rhport];
170
171 status &= ~USB_PORT_STAT_CONNECTION;
172 status |= (1 << USB_PORT_FEAT_C_CONNECTION);
173
174 vhci->port_status[rhport] = status;
175
176 spin_unlock_irqrestore(&vhci->lock, flags);
177 usb_hcd_poll_rh_status(vhci_to_hcd(vhci));
178}
179
180#define PORT_C_MASK \
181 ((USB_PORT_STAT_C_CONNECTION \
182 | USB_PORT_STAT_C_ENABLE \
183 | USB_PORT_STAT_C_SUSPEND \
184 | USB_PORT_STAT_C_OVERCURRENT \
185 | USB_PORT_STAT_C_RESET) << 16)
186
187/*
188 * Returns 0 if the status hasn't changed, or the number of bytes in buf.
189 * Ports are 0-indexed from the HCD point of view,
190 * and 1-indexed from the USB core pointer of view.
191 *
192 * @buf: a bitmap to show which port status has been changed.
193 * bit 0: reserved
194 * bit 1: the status of port 0 has been changed.
195 * bit 2: the status of port 1 has been changed.
196 * ...
197 */
198static int vhci_hub_status(struct usb_hcd *hcd, char *buf)
199{
200 struct vhci_hcd *vhci;
201 int retval;
202 int rhport;
203 int changed = 0;
204 unsigned long flags;
205
206 retval = DIV_ROUND_UP(VHCI_HC_PORTS + 1, 8);
207 memset(buf, 0, retval);
208
209 vhci = hcd_to_vhci(hcd);
210
211 spin_lock_irqsave(&vhci->lock, flags);
212 if (!HCD_HW_ACCESSIBLE(hcd)) {
213 usbip_dbg_vhci_rh("hw accessible flag not on?\n");
214 goto done;
215 }
216
217 /* check pseudo status register for each port */
218 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
219 if ((vhci->port_status[rhport] & PORT_C_MASK)) {
220 /* The status of a port has been changed, */
221 usbip_dbg_vhci_rh("port %d status changed\n", rhport);
222
223 buf[(rhport + 1) / 8] |= 1 << (rhport + 1) % 8;
224 changed = 1;
225 }
226 }
227
228 if ((hcd->state == HC_STATE_SUSPENDED) && (changed == 1))
229 usb_hcd_resume_root_hub(hcd);
230
231done:
232 spin_unlock_irqrestore(&vhci->lock, flags);
233 return changed ? retval : 0;
234}
235
236static inline void hub_descriptor(struct usb_hub_descriptor *desc)
237{
238 memset(desc, 0, sizeof(*desc));
239 desc->bDescriptorType = USB_DT_HUB;
240 desc->bDescLength = 9;
241 desc->wHubCharacteristics = cpu_to_le16(
242 HUB_CHAR_INDV_PORT_LPSM | HUB_CHAR_COMMON_OCPM);
243 desc->bNbrPorts = VHCI_HC_PORTS;
244 desc->u.hs.DeviceRemovable[0] = 0xff;
245 desc->u.hs.DeviceRemovable[1] = 0xff;
246}
247
248static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
249 u16 wIndex, char *buf, u16 wLength)
250{
251 struct vhci_hcd *dum;
252 int retval = 0;
253 int rhport;
254 unsigned long flags;
255
256 u32 prev_port_status[VHCI_HC_PORTS];
257
258 if (!HCD_HW_ACCESSIBLE(hcd))
259 return -ETIMEDOUT;
260
261 /*
262 * NOTE:
263 * wIndex shows the port number and begins from 1.
264 */
265 usbip_dbg_vhci_rh("typeReq %x wValue %x wIndex %x\n", typeReq, wValue,
266 wIndex);
267 if (wIndex > VHCI_HC_PORTS)
268 pr_err("invalid port number %d\n", wIndex);
269 rhport = ((__u8)(wIndex & 0x00ff)) - 1;
270
271 dum = hcd_to_vhci(hcd);
272
273 spin_lock_irqsave(&dum->lock, flags);
274
275 /* store old status and compare now and old later */
276 if (usbip_dbg_flag_vhci_rh) {
277 memcpy(prev_port_status, dum->port_status,
278 sizeof(prev_port_status));
279 }
280
281 switch (typeReq) {
282 case ClearHubFeature:
283 usbip_dbg_vhci_rh(" ClearHubFeature\n");
284 break;
285 case ClearPortFeature:
286 switch (wValue) {
287 case USB_PORT_FEAT_SUSPEND:
288 if (dum->port_status[rhport] & USB_PORT_STAT_SUSPEND) {
289 /* 20msec signaling */
290 dum->resuming = 1;
291 dum->re_timeout =
292 jiffies + msecs_to_jiffies(20);
293 }
294 break;
295 case USB_PORT_FEAT_POWER:
296 usbip_dbg_vhci_rh(
297 " ClearPortFeature: USB_PORT_FEAT_POWER\n");
298 dum->port_status[rhport] = 0;
299 dum->resuming = 0;
300 break;
301 case USB_PORT_FEAT_C_RESET:
302 usbip_dbg_vhci_rh(
303 " ClearPortFeature: USB_PORT_FEAT_C_RESET\n");
304 switch (dum->vdev[rhport].speed) {
305 case USB_SPEED_HIGH:
306 dum->port_status[rhport] |=
307 USB_PORT_STAT_HIGH_SPEED;
308 break;
309 case USB_SPEED_LOW:
310 dum->port_status[rhport] |=
311 USB_PORT_STAT_LOW_SPEED;
312 break;
313 default:
314 break;
315 }
316 default:
317 usbip_dbg_vhci_rh(" ClearPortFeature: default %x\n",
318 wValue);
319 dum->port_status[rhport] &= ~(1 << wValue);
320 break;
321 }
322 break;
323 case GetHubDescriptor:
324 usbip_dbg_vhci_rh(" GetHubDescriptor\n");
325 hub_descriptor((struct usb_hub_descriptor *) buf);
326 break;
327 case GetHubStatus:
328 usbip_dbg_vhci_rh(" GetHubStatus\n");
329 *(__le32 *) buf = cpu_to_le32(0);
330 break;
331 case GetPortStatus:
332 usbip_dbg_vhci_rh(" GetPortStatus port %x\n", wIndex);
333 if (wIndex > VHCI_HC_PORTS || wIndex < 1) {
334 pr_err("invalid port number %d\n", wIndex);
335 retval = -EPIPE;
336 }
337
338 /* we do not care about resume. */
339
340 /* whoever resets or resumes must GetPortStatus to
341 * complete it!!
342 */
343 if (dum->resuming && time_after(jiffies, dum->re_timeout)) {
344 dum->port_status[rhport] |=
345 (1 << USB_PORT_FEAT_C_SUSPEND);
346 dum->port_status[rhport] &=
347 ~(1 << USB_PORT_FEAT_SUSPEND);
348 dum->resuming = 0;
349 dum->re_timeout = 0;
350 }
351
352 if ((dum->port_status[rhport] & (1 << USB_PORT_FEAT_RESET)) !=
353 0 && time_after(jiffies, dum->re_timeout)) {
354 dum->port_status[rhport] |=
355 (1 << USB_PORT_FEAT_C_RESET);
356 dum->port_status[rhport] &=
357 ~(1 << USB_PORT_FEAT_RESET);
358 dum->re_timeout = 0;
359
360 if (dum->vdev[rhport].ud.status ==
361 VDEV_ST_NOTASSIGNED) {
362 usbip_dbg_vhci_rh(
363 " enable rhport %d (status %u)\n",
364 rhport,
365 dum->vdev[rhport].ud.status);
366 dum->port_status[rhport] |=
367 USB_PORT_STAT_ENABLE;
368 }
369 }
370 ((__le16 *) buf)[0] = cpu_to_le16(dum->port_status[rhport]);
371 ((__le16 *) buf)[1] =
372 cpu_to_le16(dum->port_status[rhport] >> 16);
373
374 usbip_dbg_vhci_rh(" GetPortStatus bye %x %x\n", ((u16 *)buf)[0],
375 ((u16 *)buf)[1]);
376 break;
377 case SetHubFeature:
378 usbip_dbg_vhci_rh(" SetHubFeature\n");
379 retval = -EPIPE;
380 break;
381 case SetPortFeature:
382 switch (wValue) {
383 case USB_PORT_FEAT_SUSPEND:
384 usbip_dbg_vhci_rh(
385 " SetPortFeature: USB_PORT_FEAT_SUSPEND\n");
386 break;
387 case USB_PORT_FEAT_RESET:
388 usbip_dbg_vhci_rh(
389 " SetPortFeature: USB_PORT_FEAT_RESET\n");
390 /* if it's already running, disconnect first */
391 if (dum->port_status[rhport] & USB_PORT_STAT_ENABLE) {
392 dum->port_status[rhport] &=
393 ~(USB_PORT_STAT_ENABLE |
394 USB_PORT_STAT_LOW_SPEED |
395 USB_PORT_STAT_HIGH_SPEED);
396 /* FIXME test that code path! */
397 }
398 /* 50msec reset signaling */
399 dum->re_timeout = jiffies + msecs_to_jiffies(50);
400
401 /* FALLTHROUGH */
402 default:
403 usbip_dbg_vhci_rh(" SetPortFeature: default %d\n",
404 wValue);
405 dum->port_status[rhport] |= (1 << wValue);
406 break;
407 }
408 break;
409
410 default:
411 pr_err("default: no such request\n");
412
413 /* "protocol stall" on error */
414 retval = -EPIPE;
415 }
416
417 if (usbip_dbg_flag_vhci_rh) {
418 pr_debug("port %d\n", rhport);
419 /* Only dump valid port status */
420 if (rhport >= 0) {
421 dump_port_status_diff(prev_port_status[rhport],
422 dum->port_status[rhport]);
423 }
424 }
425 usbip_dbg_vhci_rh(" bye\n");
426
427 spin_unlock_irqrestore(&dum->lock, flags);
428
429 return retval;
430}
431
432static struct vhci_device *get_vdev(struct usb_device *udev)
433{
434 struct platform_device *pdev;
435 struct usb_hcd *hcd;
436 struct vhci_hcd *vhci;
437 int pdev_nr, rhport;
438
439 if (!udev)
440 return NULL;
441
442 for (pdev_nr = 0; pdev_nr < vhci_num_controllers; pdev_nr++) {
443 pdev = *(vhci_pdevs + pdev_nr);
444 if (pdev == NULL)
445 continue;
446 hcd = platform_get_drvdata(pdev);
447 if (hcd == NULL)
448 continue;
449 vhci = hcd_to_vhci(hcd);
450 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
451 if (vhci->vdev[rhport].udev == udev)
452 return &vhci->vdev[rhport];
453 }
454 }
455
456 return NULL;
457}
458
459static void vhci_tx_urb(struct urb *urb)
460{
461 struct vhci_device *vdev = get_vdev(urb->dev);
462 struct vhci_priv *priv;
463 struct vhci_hcd *vhci;
464 unsigned long flags;
465
466 if (!vdev) {
467 pr_err("could not get virtual device");
468 return;
469 }
470 vhci = vdev_to_vhci(vdev);
471
472 priv = kzalloc(sizeof(struct vhci_priv), GFP_ATOMIC);
473 if (!priv) {
474 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
475 return;
476 }
477
478 spin_lock_irqsave(&vdev->priv_lock, flags);
479
480 priv->seqnum = atomic_inc_return(&vhci->seqnum);
481 if (priv->seqnum == 0xffff)
482 dev_info(&urb->dev->dev, "seqnum max\n");
483
484 priv->vdev = vdev;
485 priv->urb = urb;
486
487 urb->hcpriv = (void *) priv;
488
489 list_add_tail(&priv->list, &vdev->priv_tx);
490
491 wake_up(&vdev->waitq_tx);
492 spin_unlock_irqrestore(&vdev->priv_lock, flags);
493}
494
495static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
496 gfp_t mem_flags)
497{
498 struct vhci_hcd *vhci = hcd_to_vhci(hcd);
499 struct device *dev = &urb->dev->dev;
500 u8 portnum = urb->dev->portnum;
501 int ret = 0;
502 struct vhci_device *vdev;
503 unsigned long flags;
504
505 usbip_dbg_vhci_hc("enter, usb_hcd %p urb %p mem_flags %d\n",
506 hcd, urb, mem_flags);
507
508 if (portnum > VHCI_HC_PORTS) {
509 pr_err("invalid port number %d\n", portnum);
510 return -ENODEV;
511 }
512 vdev = &vhci->vdev[portnum-1];
513
514 /* patch to usb_sg_init() is in 2.5.60 */
515 BUG_ON(!urb->transfer_buffer && urb->transfer_buffer_length);
516
517 spin_lock_irqsave(&vhci->lock, flags);
518
519 if (urb->status != -EINPROGRESS) {
520 dev_err(dev, "URB already unlinked!, status %d\n", urb->status);
521 spin_unlock_irqrestore(&vhci->lock, flags);
522 return urb->status;
523 }
524
525 /* refuse enqueue for dead connection */
526 spin_lock(&vdev->ud.lock);
527 if (vdev->ud.status == VDEV_ST_NULL ||
528 vdev->ud.status == VDEV_ST_ERROR) {
529 dev_err(dev, "enqueue for inactive port %d\n", vdev->rhport);
530 spin_unlock(&vdev->ud.lock);
531 spin_unlock_irqrestore(&vhci->lock, flags);
532 return -ENODEV;
533 }
534 spin_unlock(&vdev->ud.lock);
535
536 ret = usb_hcd_link_urb_to_ep(hcd, urb);
537 if (ret)
538 goto no_need_unlink;
539
540 /*
541 * The enumeration process is as follows;
542 *
543 * 1. Get_Descriptor request to DevAddrs(0) EndPoint(0)
544 * to get max packet length of default pipe
545 *
546 * 2. Set_Address request to DevAddr(0) EndPoint(0)
547 *
548 */
549 if (usb_pipedevice(urb->pipe) == 0) {
550 __u8 type = usb_pipetype(urb->pipe);
551 struct usb_ctrlrequest *ctrlreq =
552 (struct usb_ctrlrequest *) urb->setup_packet;
553
554 if (type != PIPE_CONTROL || !ctrlreq) {
555 dev_err(dev, "invalid request to devnum 0\n");
556 ret = -EINVAL;
557 goto no_need_xmit;
558 }
559
560 switch (ctrlreq->bRequest) {
561 case USB_REQ_SET_ADDRESS:
562 /* set_address may come when a device is reset */
563 dev_info(dev, "SetAddress Request (%d) to port %d\n",
564 ctrlreq->wValue, vdev->rhport);
565
566 usb_put_dev(vdev->udev);
567 vdev->udev = usb_get_dev(urb->dev);
568
569 spin_lock(&vdev->ud.lock);
570 vdev->ud.status = VDEV_ST_USED;
571 spin_unlock(&vdev->ud.lock);
572
573 if (urb->status == -EINPROGRESS) {
574 /* This request is successfully completed. */
575 /* If not -EINPROGRESS, possibly unlinked. */
576 urb->status = 0;
577 }
578
579 goto no_need_xmit;
580
581 case USB_REQ_GET_DESCRIPTOR:
582 if (ctrlreq->wValue == cpu_to_le16(USB_DT_DEVICE << 8))
583 usbip_dbg_vhci_hc(
584 "Not yet?:Get_Descriptor to device 0 (get max pipe size)\n");
585
586 usb_put_dev(vdev->udev);
587 vdev->udev = usb_get_dev(urb->dev);
588 goto out;
589
590 default:
591 /* NOT REACHED */
592 dev_err(dev,
593 "invalid request to devnum 0 bRequest %u, wValue %u\n",
594 ctrlreq->bRequest,
595 ctrlreq->wValue);
596 ret = -EINVAL;
597 goto no_need_xmit;
598 }
599
600 }
601
602out:
603 vhci_tx_urb(urb);
604 spin_unlock_irqrestore(&vhci->lock, flags);
605
606 return 0;
607
608no_need_xmit:
609 usb_hcd_unlink_urb_from_ep(hcd, urb);
610no_need_unlink:
611 spin_unlock_irqrestore(&vhci->lock, flags);
612 if (!ret)
613 usb_hcd_giveback_urb(hcd, urb, urb->status);
614 return ret;
615}
616
617/*
618 * vhci_rx gives back the urb after receiving the reply of the urb. If an
619 * unlink pdu is sent or not, vhci_rx receives a normal return pdu and gives
620 * back its urb. For the driver unlinking the urb, the content of the urb is
621 * not important, but the calling to its completion handler is important; the
622 * completion of unlinking is notified by the completion handler.
623 *
624 *
625 * CLIENT SIDE
626 *
627 * - When vhci_hcd receives RET_SUBMIT,
628 *
629 * - case 1a). the urb of the pdu is not unlinking.
630 * - normal case
631 * => just give back the urb
632 *
633 * - case 1b). the urb of the pdu is unlinking.
634 * - usbip.ko will return a reply of the unlinking request.
635 * => give back the urb now and go to case 2b).
636 *
637 * - When vhci_hcd receives RET_UNLINK,
638 *
639 * - case 2a). a submit request is still pending in vhci_hcd.
640 * - urb was really pending in usbip.ko and urb_unlink_urb() was
641 * completed there.
642 * => free a pending submit request
643 * => notify unlink completeness by giving back the urb
644 *
645 * - case 2b). a submit request is *not* pending in vhci_hcd.
646 * - urb was already given back to the core driver.
647 * => do not give back the urb
648 *
649 *
650 * SERVER SIDE
651 *
652 * - When usbip receives CMD_UNLINK,
653 *
654 * - case 3a). the urb of the unlink request is now in submission.
655 * => do usb_unlink_urb().
656 * => after the unlink is completed, send RET_UNLINK.
657 *
658 * - case 3b). the urb of the unlink request is not in submission.
659 * - may be already completed or never be received
660 * => send RET_UNLINK
661 *
662 */
663static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
664{
665 struct vhci_hcd *vhci = hcd_to_vhci(hcd);
666 struct vhci_priv *priv;
667 struct vhci_device *vdev;
668 unsigned long flags;
669
670 pr_info("dequeue a urb %p\n", urb);
671
672 spin_lock_irqsave(&vhci->lock, flags);
673
674 priv = urb->hcpriv;
675 if (!priv) {
676 /* URB was never linked! or will be soon given back by
677 * vhci_rx. */
678 spin_unlock_irqrestore(&vhci->lock, flags);
679 return -EIDRM;
680 }
681
682 {
683 int ret = 0;
684
685 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
686 if (ret) {
687 spin_unlock_irqrestore(&vhci->lock, flags);
688 return ret;
689 }
690 }
691
692 /* send unlink request here? */
693 vdev = priv->vdev;
694
695 if (!vdev->ud.tcp_socket) {
696 /* tcp connection is closed */
697 spin_lock(&vdev->priv_lock);
698
699 pr_info("device %p seems to be disconnected\n", vdev);
700 list_del(&priv->list);
701 kfree(priv);
702 urb->hcpriv = NULL;
703
704 spin_unlock(&vdev->priv_lock);
705
706 /*
707 * If tcp connection is alive, we have sent CMD_UNLINK.
708 * vhci_rx will receive RET_UNLINK and give back the URB.
709 * Otherwise, we give back it here.
710 */
711 pr_info("gives back urb %p\n", urb);
712
713 usb_hcd_unlink_urb_from_ep(hcd, urb);
714
715 spin_unlock_irqrestore(&vhci->lock, flags);
716 usb_hcd_giveback_urb(vhci_to_hcd(vhci), urb, urb->status);
717 spin_lock_irqsave(&vhci->lock, flags);
718
719 } else {
720 /* tcp connection is alive */
721 struct vhci_unlink *unlink;
722
723 spin_lock(&vdev->priv_lock);
724
725 /* setup CMD_UNLINK pdu */
726 unlink = kzalloc(sizeof(struct vhci_unlink), GFP_ATOMIC);
727 if (!unlink) {
728 spin_unlock(&vdev->priv_lock);
729 spin_unlock_irqrestore(&vhci->lock, flags);
730 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
731 return -ENOMEM;
732 }
733
734 unlink->seqnum = atomic_inc_return(&vhci->seqnum);
735 if (unlink->seqnum == 0xffff)
736 pr_info("seqnum max\n");
737
738 unlink->unlink_seqnum = priv->seqnum;
739
740 pr_info("device %p seems to be still connected\n", vdev);
741
742 /* send cmd_unlink and try to cancel the pending URB in the
743 * peer */
744 list_add_tail(&unlink->list, &vdev->unlink_tx);
745 wake_up(&vdev->waitq_tx);
746
747 spin_unlock(&vdev->priv_lock);
748 }
749
750 spin_unlock_irqrestore(&vhci->lock, flags);
751
752 usbip_dbg_vhci_hc("leave\n");
753 return 0;
754}
755
756static void vhci_device_unlink_cleanup(struct vhci_device *vdev)
757{
758 struct vhci_hcd *vhci = vdev_to_vhci(vdev);
759 struct usb_hcd *hcd = vhci_to_hcd(vhci);
760 struct vhci_unlink *unlink, *tmp;
761 unsigned long flags;
762
763 spin_lock_irqsave(&vhci->lock, flags);
764 spin_lock(&vdev->priv_lock);
765
766 list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) {
767 pr_info("unlink cleanup tx %lu\n", unlink->unlink_seqnum);
768 list_del(&unlink->list);
769 kfree(unlink);
770 }
771
772 while (!list_empty(&vdev->unlink_rx)) {
773 struct urb *urb;
774
775 unlink = list_first_entry(&vdev->unlink_rx, struct vhci_unlink,
776 list);
777
778 /* give back URB of unanswered unlink request */
779 pr_info("unlink cleanup rx %lu\n", unlink->unlink_seqnum);
780
781 urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
782 if (!urb) {
783 pr_info("the urb (seqnum %lu) was already given back\n",
784 unlink->unlink_seqnum);
785 list_del(&unlink->list);
786 kfree(unlink);
787 continue;
788 }
789
790 urb->status = -ENODEV;
791
792 usb_hcd_unlink_urb_from_ep(hcd, urb);
793
794 list_del(&unlink->list);
795
796 spin_unlock(&vdev->priv_lock);
797 spin_unlock_irqrestore(&vhci->lock, flags);
798
799 usb_hcd_giveback_urb(hcd, urb, urb->status);
800
801 spin_lock_irqsave(&vhci->lock, flags);
802 spin_lock(&vdev->priv_lock);
803
804 kfree(unlink);
805 }
806
807 spin_unlock(&vdev->priv_lock);
808 spin_unlock_irqrestore(&vhci->lock, flags);
809}
810
811/*
812 * The important thing is that only one context begins cleanup.
813 * This is why error handling and cleanup become simple.
814 * We do not want to consider race condition as possible.
815 */
816static void vhci_shutdown_connection(struct usbip_device *ud)
817{
818 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
819
820 /* need this? see stub_dev.c */
821 if (ud->tcp_socket) {
822 pr_debug("shutdown tcp_socket %p\n", ud->tcp_socket);
823 kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR);
824 }
825
826 /* kill threads related to this sdev */
827 if (vdev->ud.tcp_rx) {
828 kthread_stop_put(vdev->ud.tcp_rx);
829 vdev->ud.tcp_rx = NULL;
830 }
831 if (vdev->ud.tcp_tx) {
832 kthread_stop_put(vdev->ud.tcp_tx);
833 vdev->ud.tcp_tx = NULL;
834 }
835 pr_info("stop threads\n");
836
837 /* active connection is closed */
838 if (vdev->ud.tcp_socket) {
839 sockfd_put(vdev->ud.tcp_socket);
840 vdev->ud.tcp_socket = NULL;
841 }
842 pr_info("release socket\n");
843
844 vhci_device_unlink_cleanup(vdev);
845
846 /*
847 * rh_port_disconnect() is a trigger of ...
848 * usb_disable_device():
849 * disable all the endpoints for a USB device.
850 * usb_disable_endpoint():
851 * disable endpoints. pending urbs are unlinked(dequeued).
852 *
853 * NOTE: After calling rh_port_disconnect(), the USB device drivers of a
854 * detached device should release used urbs in a cleanup function (i.e.
855 * xxx_disconnect()). Therefore, vhci_hcd does not need to release
856 * pushed urbs and their private data in this function.
857 *
858 * NOTE: vhci_dequeue() must be considered carefully. When shutting down
859 * a connection, vhci_shutdown_connection() expects vhci_dequeue()
860 * gives back pushed urbs and frees their private data by request of
861 * the cleanup function of a USB driver. When unlinking a urb with an
862 * active connection, vhci_dequeue() does not give back the urb which
863 * is actually given back by vhci_rx after receiving its return pdu.
864 *
865 */
866 rh_port_disconnect(vdev);
867
868 pr_info("disconnect device\n");
869}
870
871
872static void vhci_device_reset(struct usbip_device *ud)
873{
874 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
875 unsigned long flags;
876
877 spin_lock_irqsave(&ud->lock, flags);
878
879 vdev->speed = 0;
880 vdev->devid = 0;
881
882 usb_put_dev(vdev->udev);
883 vdev->udev = NULL;
884
885 if (ud->tcp_socket) {
886 sockfd_put(ud->tcp_socket);
887 ud->tcp_socket = NULL;
888 }
889 ud->status = VDEV_ST_NULL;
890
891 spin_unlock_irqrestore(&ud->lock, flags);
892}
893
894static void vhci_device_unusable(struct usbip_device *ud)
895{
896 unsigned long flags;
897
898 spin_lock_irqsave(&ud->lock, flags);
899 ud->status = VDEV_ST_ERROR;
900 spin_unlock_irqrestore(&ud->lock, flags);
901}
902
903static void vhci_device_init(struct vhci_device *vdev)
904{
905 memset(vdev, 0, sizeof(struct vhci_device));
906
907 vdev->ud.side = USBIP_VHCI;
908 vdev->ud.status = VDEV_ST_NULL;
909 spin_lock_init(&vdev->ud.lock);
910
911 INIT_LIST_HEAD(&vdev->priv_rx);
912 INIT_LIST_HEAD(&vdev->priv_tx);
913 INIT_LIST_HEAD(&vdev->unlink_tx);
914 INIT_LIST_HEAD(&vdev->unlink_rx);
915 spin_lock_init(&vdev->priv_lock);
916
917 init_waitqueue_head(&vdev->waitq_tx);
918
919 vdev->ud.eh_ops.shutdown = vhci_shutdown_connection;
920 vdev->ud.eh_ops.reset = vhci_device_reset;
921 vdev->ud.eh_ops.unusable = vhci_device_unusable;
922
923 usbip_start_eh(&vdev->ud);
924}
925
926static int hcd_name_to_id(const char *name)
927{
928 char *c;
929 long val;
930 int ret;
931
932 c = strchr(name, '.');
933 if (c == NULL)
934 return 0;
935
936 ret = kstrtol(c+1, 10, &val);
937 if (ret < 0)
938 return ret;
939
940 return val;
941}
942
943static int vhci_start(struct usb_hcd *hcd)
944{
945 struct vhci_hcd *vhci = hcd_to_vhci(hcd);
946 int id, rhport;
947 int err = 0;
948
949 usbip_dbg_vhci_hc("enter vhci_start\n");
950
951 /* initialize private data of usb_hcd */
952
953 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
954 struct vhci_device *vdev = &vhci->vdev[rhport];
955
956 vhci_device_init(vdev);
957 vdev->rhport = rhport;
958 }
959
960 atomic_set(&vhci->seqnum, 0);
961 spin_lock_init(&vhci->lock);
962
963 hcd->power_budget = 0; /* no limit */
964 hcd->uses_new_polling = 1;
965
966 id = hcd_name_to_id(hcd_name(hcd));
967 if (id < 0) {
968 pr_err("invalid vhci name %s\n", hcd_name(hcd));
969 return -EINVAL;
970 }
971
972 /* vhci_hcd is now ready to be controlled through sysfs */
973 if (id == 0) {
974 err = vhci_init_attr_group();
975 if (err) {
976 pr_err("init attr group\n");
977 return err;
978 }
979 err = sysfs_create_group(&hcd_dev(hcd)->kobj, &vhci_attr_group);
980 if (err) {
981 pr_err("create sysfs files\n");
982 vhci_finish_attr_group();
983 return err;
984 }
985 pr_info("created sysfs %s\n", hcd_name(hcd));
986 }
987
988 return 0;
989}
990
991static void vhci_stop(struct usb_hcd *hcd)
992{
993 struct vhci_hcd *vhci = hcd_to_vhci(hcd);
994 int id, rhport;
995
996 usbip_dbg_vhci_hc("stop VHCI controller\n");
997
998 /* 1. remove the userland interface of vhci_hcd */
999 id = hcd_name_to_id(hcd_name(hcd));
1000 if (id == 0) {
1001 sysfs_remove_group(&hcd_dev(hcd)->kobj, &vhci_attr_group);
1002 vhci_finish_attr_group();
1003 }
1004
1005 /* 2. shutdown all the ports of vhci_hcd */
1006 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
1007 struct vhci_device *vdev = &vhci->vdev[rhport];
1008
1009 usbip_event_add(&vdev->ud, VDEV_EVENT_REMOVED);
1010 usbip_stop_eh(&vdev->ud);
1011 }
1012}
1013
1014static int vhci_get_frame_number(struct usb_hcd *hcd)
1015{
1016 dev_err_ratelimited(&hcd->self.root_hub->dev, "Not yet implemented\n");
1017 return 0;
1018}
1019
1020#ifdef CONFIG_PM
1021
1022/* FIXME: suspend/resume */
1023static int vhci_bus_suspend(struct usb_hcd *hcd)
1024{
1025 struct vhci_hcd *vhci = hcd_to_vhci(hcd);
1026 unsigned long flags;
1027
1028 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1029
1030 spin_lock_irqsave(&vhci->lock, flags);
1031 hcd->state = HC_STATE_SUSPENDED;
1032 spin_unlock_irqrestore(&vhci->lock, flags);
1033
1034 return 0;
1035}
1036
1037static int vhci_bus_resume(struct usb_hcd *hcd)
1038{
1039 struct vhci_hcd *vhci = hcd_to_vhci(hcd);
1040 int rc = 0;
1041 unsigned long flags;
1042
1043 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1044
1045 spin_lock_irqsave(&vhci->lock, flags);
1046 if (!HCD_HW_ACCESSIBLE(hcd))
1047 rc = -ESHUTDOWN;
1048 else
1049 hcd->state = HC_STATE_RUNNING;
1050 spin_unlock_irqrestore(&vhci->lock, flags);
1051
1052 return rc;
1053}
1054
1055#else
1056
1057#define vhci_bus_suspend NULL
1058#define vhci_bus_resume NULL
1059#endif
1060
1061static struct hc_driver vhci_hc_driver = {
1062 .description = driver_name,
1063 .product_desc = driver_desc,
1064 .hcd_priv_size = sizeof(struct vhci_hcd),
1065
1066 .flags = HCD_USB2,
1067
1068 .start = vhci_start,
1069 .stop = vhci_stop,
1070
1071 .urb_enqueue = vhci_urb_enqueue,
1072 .urb_dequeue = vhci_urb_dequeue,
1073
1074 .get_frame_number = vhci_get_frame_number,
1075
1076 .hub_status_data = vhci_hub_status,
1077 .hub_control = vhci_hub_control,
1078 .bus_suspend = vhci_bus_suspend,
1079 .bus_resume = vhci_bus_resume,
1080};
1081
1082static int vhci_hcd_probe(struct platform_device *pdev)
1083{
1084 struct usb_hcd *hcd;
1085 int ret;
1086
1087 usbip_dbg_vhci_hc("name %s id %d\n", pdev->name, pdev->id);
1088
1089 /*
1090 * Allocate and initialize hcd.
1091 * Our private data is also allocated automatically.
1092 */
1093 hcd = usb_create_hcd(&vhci_hc_driver, &pdev->dev, dev_name(&pdev->dev));
1094 if (!hcd) {
1095 pr_err("create hcd failed\n");
1096 return -ENOMEM;
1097 }
1098 hcd->has_tt = 1;
1099
1100 /*
1101 * Finish generic HCD structure initialization and register.
1102 * Call the driver's reset() and start() routines.
1103 */
1104 ret = usb_add_hcd(hcd, 0, 0);
1105 if (ret != 0) {
1106 pr_err("usb_add_hcd failed %d\n", ret);
1107 usb_put_hcd(hcd);
1108 return ret;
1109 }
1110
1111 usbip_dbg_vhci_hc("bye\n");
1112 return 0;
1113}
1114
1115static int vhci_hcd_remove(struct platform_device *pdev)
1116{
1117 struct usb_hcd *hcd;
1118
1119 hcd = platform_get_drvdata(pdev);
1120 if (!hcd)
1121 return 0;
1122
1123 /*
1124 * Disconnects the root hub,
1125 * then reverses the effects of usb_add_hcd(),
1126 * invoking the HCD's stop() methods.
1127 */
1128 usb_remove_hcd(hcd);
1129 usb_put_hcd(hcd);
1130
1131 return 0;
1132}
1133
1134#ifdef CONFIG_PM
1135
1136/* what should happen for USB/IP under suspend/resume? */
1137static int vhci_hcd_suspend(struct platform_device *pdev, pm_message_t state)
1138{
1139 struct usb_hcd *hcd;
1140 struct vhci_hcd *vhci;
1141 int rhport;
1142 int connected = 0;
1143 int ret = 0;
1144 unsigned long flags;
1145
1146 hcd = platform_get_drvdata(pdev);
1147 if (!hcd)
1148 return 0;
1149 vhci = hcd_to_vhci(hcd);
1150
1151 spin_lock_irqsave(&vhci->lock, flags);
1152
1153 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++)
1154 if (vhci->port_status[rhport] & USB_PORT_STAT_CONNECTION)
1155 connected += 1;
1156
1157 spin_unlock_irqrestore(&vhci->lock, flags);
1158
1159 if (connected > 0) {
1160 dev_info(&pdev->dev,
1161 "We have %d active connection%s. Do not suspend.\n",
1162 connected, (connected == 1 ? "" : "s"));
1163 ret = -EBUSY;
1164 } else {
1165 dev_info(&pdev->dev, "suspend vhci_hcd");
1166 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1167 }
1168
1169 return ret;
1170}
1171
1172static int vhci_hcd_resume(struct platform_device *pdev)
1173{
1174 struct usb_hcd *hcd;
1175
1176 dev_dbg(&pdev->dev, "%s\n", __func__);
1177
1178 hcd = platform_get_drvdata(pdev);
1179 if (!hcd)
1180 return 0;
1181 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1182 usb_hcd_poll_rh_status(hcd);
1183
1184 return 0;
1185}
1186
1187#else
1188
1189#define vhci_hcd_suspend NULL
1190#define vhci_hcd_resume NULL
1191
1192#endif
1193
1194static struct platform_driver vhci_driver = {
1195 .probe = vhci_hcd_probe,
1196 .remove = vhci_hcd_remove,
1197 .suspend = vhci_hcd_suspend,
1198 .resume = vhci_hcd_resume,
1199 .driver = {
1200 .name = driver_name,
1201 },
1202};
1203
1204static int add_platform_device(int id)
1205{
1206 struct platform_device *pdev;
1207 int dev_nr;
1208
1209 if (id == 0)
1210 dev_nr = -1;
1211 else
1212 dev_nr = id;
1213
1214 pdev = platform_device_register_simple(driver_name, dev_nr, NULL, 0);
1215 if (IS_ERR(pdev))
1216 return PTR_ERR(pdev);
1217
1218 *(vhci_pdevs + id) = pdev;
1219 return 0;
1220}
1221
1222static void del_platform_devices(void)
1223{
1224 struct platform_device *pdev;
1225 int i;
1226
1227 for (i = 0; i < vhci_num_controllers; i++) {
1228 pdev = *(vhci_pdevs + i);
1229 if (pdev != NULL)
1230 platform_device_unregister(pdev);
1231 *(vhci_pdevs + i) = NULL;
1232 }
1233 sysfs_remove_link(&platform_bus.kobj, driver_name);
1234}
1235
1236static int __init vhci_hcd_init(void)
1237{
1238 int i, ret;
1239
1240 if (usb_disabled())
1241 return -ENODEV;
1242
1243 if (vhci_num_controllers < 1)
1244 vhci_num_controllers = 1;
1245
1246 vhci_pdevs = kcalloc(vhci_num_controllers, sizeof(void *), GFP_KERNEL);
1247 if (vhci_pdevs == NULL)
1248 return -ENOMEM;
1249
1250 ret = platform_driver_register(&vhci_driver);
1251 if (ret)
1252 goto err_driver_register;
1253
1254 for (i = 0; i < vhci_num_controllers; i++) {
1255 ret = add_platform_device(i);
1256 if (ret)
1257 goto err_platform_device_register;
1258 }
1259
1260 pr_info(DRIVER_DESC " v" USBIP_VERSION "\n");
1261 return ret;
1262
1263err_platform_device_register:
1264 del_platform_devices();
1265 platform_driver_unregister(&vhci_driver);
1266err_driver_register:
1267 kfree(vhci_pdevs);
1268 return ret;
1269}
1270
1271static void __exit vhci_hcd_exit(void)
1272{
1273 del_platform_devices();
1274 platform_driver_unregister(&vhci_driver);
1275 kfree(vhci_pdevs);
1276}
1277
1278module_init(vhci_hcd_init);
1279module_exit(vhci_hcd_exit);
1280
1281MODULE_AUTHOR(DRIVER_AUTHOR);
1282MODULE_DESCRIPTION(DRIVER_DESC);
1283MODULE_LICENSE("GPL");
1284MODULE_VERSION(USBIP_VERSION);