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1/*
2 * Copyright (c) 2006, 2007, 2008 QLogic Corporation. All rights reserved.
3 * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34#include <linux/pci.h>
35#include <linux/netdevice.h>
36#include <linux/slab.h>
37#include <linux/vmalloc.h>
38
39#include "ipath_kernel.h"
40#include "ipath_common.h"
41
42/*
43 * min buffers we want to have per port, after driver
44 */
45#define IPATH_MIN_USER_PORT_BUFCNT 7
46
47/*
48 * Number of ports we are configured to use (to allow for more pio
49 * buffers per port, etc.) Zero means use chip value.
50 */
51static ushort ipath_cfgports;
52
53module_param_named(cfgports, ipath_cfgports, ushort, S_IRUGO);
54MODULE_PARM_DESC(cfgports, "Set max number of ports to use");
55
56/*
57 * Number of buffers reserved for driver (verbs and layered drivers.)
58 * Initialized based on number of PIO buffers if not set via module interface.
59 * The problem with this is that it's global, but we'll use different
60 * numbers for different chip types.
61 */
62static ushort ipath_kpiobufs;
63
64static int ipath_set_kpiobufs(const char *val, struct kernel_param *kp);
65
66module_param_call(kpiobufs, ipath_set_kpiobufs, param_get_ushort,
67 &ipath_kpiobufs, S_IWUSR | S_IRUGO);
68MODULE_PARM_DESC(kpiobufs, "Set number of PIO buffers for driver");
69
70/**
71 * create_port0_egr - allocate the eager TID buffers
72 * @dd: the infinipath device
73 *
74 * This code is now quite different for user and kernel, because
75 * the kernel uses skb's, for the accelerated network performance.
76 * This is the kernel (port0) version.
77 *
78 * Allocate the eager TID buffers and program them into infinipath.
79 * We use the network layer alloc_skb() allocator to allocate the
80 * memory, and either use the buffers as is for things like verbs
81 * packets, or pass the buffers up to the ipath layered driver and
82 * thence the network layer, replacing them as we do so (see
83 * ipath_rcv_layer()).
84 */
85static int create_port0_egr(struct ipath_devdata *dd)
86{
87 unsigned e, egrcnt;
88 struct ipath_skbinfo *skbinfo;
89 int ret;
90
91 egrcnt = dd->ipath_p0_rcvegrcnt;
92
93 skbinfo = vmalloc(sizeof(*dd->ipath_port0_skbinfo) * egrcnt);
94 if (skbinfo == NULL) {
95 ipath_dev_err(dd, "allocation error for eager TID "
96 "skb array\n");
97 ret = -ENOMEM;
98 goto bail;
99 }
100 for (e = 0; e < egrcnt; e++) {
101 /*
102 * This is a bit tricky in that we allocate extra
103 * space for 2 bytes of the 14 byte ethernet header.
104 * These two bytes are passed in the ipath header so
105 * the rest of the data is word aligned. We allocate
106 * 4 bytes so that the data buffer stays word aligned.
107 * See ipath_kreceive() for more details.
108 */
109 skbinfo[e].skb = ipath_alloc_skb(dd, GFP_KERNEL);
110 if (!skbinfo[e].skb) {
111 ipath_dev_err(dd, "SKB allocation error for "
112 "eager TID %u\n", e);
113 while (e != 0)
114 dev_kfree_skb(skbinfo[--e].skb);
115 vfree(skbinfo);
116 ret = -ENOMEM;
117 goto bail;
118 }
119 }
120 /*
121 * After loop above, so we can test non-NULL to see if ready
122 * to use at receive, etc.
123 */
124 dd->ipath_port0_skbinfo = skbinfo;
125
126 for (e = 0; e < egrcnt; e++) {
127 dd->ipath_port0_skbinfo[e].phys =
128 ipath_map_single(dd->pcidev,
129 dd->ipath_port0_skbinfo[e].skb->data,
130 dd->ipath_ibmaxlen, PCI_DMA_FROMDEVICE);
131 dd->ipath_f_put_tid(dd, e + (u64 __iomem *)
132 ((char __iomem *) dd->ipath_kregbase +
133 dd->ipath_rcvegrbase),
134 RCVHQ_RCV_TYPE_EAGER,
135 dd->ipath_port0_skbinfo[e].phys);
136 }
137
138 ret = 0;
139
140bail:
141 return ret;
142}
143
144static int bringup_link(struct ipath_devdata *dd)
145{
146 u64 val, ibc;
147 int ret = 0;
148
149 /* hold IBC in reset */
150 dd->ipath_control &= ~INFINIPATH_C_LINKENABLE;
151 ipath_write_kreg(dd, dd->ipath_kregs->kr_control,
152 dd->ipath_control);
153
154 /*
155 * set initial max size pkt IBC will send, including ICRC; it's the
156 * PIO buffer size in dwords, less 1; also see ipath_set_mtu()
157 */
158 val = (dd->ipath_ibmaxlen >> 2) + 1;
159 ibc = val << dd->ibcc_mpl_shift;
160
161 /* flowcontrolwatermark is in units of KBytes */
162 ibc |= 0x5ULL << INFINIPATH_IBCC_FLOWCTRLWATERMARK_SHIFT;
163 /*
164 * How often flowctrl sent. More or less in usecs; balance against
165 * watermark value, so that in theory senders always get a flow
166 * control update in time to not let the IB link go idle.
167 */
168 ibc |= 0x3ULL << INFINIPATH_IBCC_FLOWCTRLPERIOD_SHIFT;
169 /* max error tolerance */
170 ibc |= 0xfULL << INFINIPATH_IBCC_PHYERRTHRESHOLD_SHIFT;
171 /* use "real" buffer space for */
172 ibc |= 4ULL << INFINIPATH_IBCC_CREDITSCALE_SHIFT;
173 /* IB credit flow control. */
174 ibc |= 0xfULL << INFINIPATH_IBCC_OVERRUNTHRESHOLD_SHIFT;
175 /* initially come up waiting for TS1, without sending anything. */
176 dd->ipath_ibcctrl = ibc;
177 /*
178 * Want to start out with both LINKCMD and LINKINITCMD in NOP
179 * (0 and 0). Don't put linkinitcmd in ipath_ibcctrl, want that
180 * to stay a NOP. Flag that we are disabled, for the (unlikely)
181 * case that some recovery path is trying to bring the link up
182 * before we are ready.
183 */
184 ibc |= INFINIPATH_IBCC_LINKINITCMD_DISABLE <<
185 INFINIPATH_IBCC_LINKINITCMD_SHIFT;
186 dd->ipath_flags |= IPATH_IB_LINK_DISABLED;
187 ipath_cdbg(VERBOSE, "Writing 0x%llx to ibcctrl\n",
188 (unsigned long long) ibc);
189 ipath_write_kreg(dd, dd->ipath_kregs->kr_ibcctrl, ibc);
190
191 // be sure chip saw it
192 val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
193
194 ret = dd->ipath_f_bringup_serdes(dd);
195
196 if (ret)
197 dev_info(&dd->pcidev->dev, "Could not initialize SerDes, "
198 "not usable\n");
199 else {
200 /* enable IBC */
201 dd->ipath_control |= INFINIPATH_C_LINKENABLE;
202 ipath_write_kreg(dd, dd->ipath_kregs->kr_control,
203 dd->ipath_control);
204 }
205
206 return ret;
207}
208
209static struct ipath_portdata *create_portdata0(struct ipath_devdata *dd)
210{
211 struct ipath_portdata *pd = NULL;
212
213 pd = kzalloc(sizeof(*pd), GFP_KERNEL);
214 if (pd) {
215 pd->port_dd = dd;
216 pd->port_cnt = 1;
217 /* The port 0 pkey table is used by the layer interface. */
218 pd->port_pkeys[0] = IPATH_DEFAULT_P_KEY;
219 pd->port_seq_cnt = 1;
220 }
221 return pd;
222}
223
224static int init_chip_first(struct ipath_devdata *dd)
225{
226 struct ipath_portdata *pd;
227 int ret = 0;
228 u64 val;
229
230 spin_lock_init(&dd->ipath_kernel_tid_lock);
231 spin_lock_init(&dd->ipath_user_tid_lock);
232 spin_lock_init(&dd->ipath_sendctrl_lock);
233 spin_lock_init(&dd->ipath_uctxt_lock);
234 spin_lock_init(&dd->ipath_sdma_lock);
235 spin_lock_init(&dd->ipath_gpio_lock);
236 spin_lock_init(&dd->ipath_eep_st_lock);
237 spin_lock_init(&dd->ipath_sdepb_lock);
238 mutex_init(&dd->ipath_eep_lock);
239
240 /*
241 * skip cfgports stuff because we are not allocating memory,
242 * and we don't want problems if the portcnt changed due to
243 * cfgports. We do still check and report a difference, if
244 * not same (should be impossible).
245 */
246 dd->ipath_f_config_ports(dd, ipath_cfgports);
247 if (!ipath_cfgports)
248 dd->ipath_cfgports = dd->ipath_portcnt;
249 else if (ipath_cfgports <= dd->ipath_portcnt) {
250 dd->ipath_cfgports = ipath_cfgports;
251 ipath_dbg("Configured to use %u ports out of %u in chip\n",
252 dd->ipath_cfgports, ipath_read_kreg32(dd,
253 dd->ipath_kregs->kr_portcnt));
254 } else {
255 dd->ipath_cfgports = dd->ipath_portcnt;
256 ipath_dbg("Tried to configured to use %u ports; chip "
257 "only supports %u\n", ipath_cfgports,
258 ipath_read_kreg32(dd,
259 dd->ipath_kregs->kr_portcnt));
260 }
261 /*
262 * Allocate full portcnt array, rather than just cfgports, because
263 * cleanup iterates across all possible ports.
264 */
265 dd->ipath_pd = kzalloc(sizeof(*dd->ipath_pd) * dd->ipath_portcnt,
266 GFP_KERNEL);
267
268 if (!dd->ipath_pd) {
269 ipath_dev_err(dd, "Unable to allocate portdata array, "
270 "failing\n");
271 ret = -ENOMEM;
272 goto done;
273 }
274
275 pd = create_portdata0(dd);
276 if (!pd) {
277 ipath_dev_err(dd, "Unable to allocate portdata for port "
278 "0, failing\n");
279 ret = -ENOMEM;
280 goto done;
281 }
282 dd->ipath_pd[0] = pd;
283
284 dd->ipath_rcvtidcnt =
285 ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvtidcnt);
286 dd->ipath_rcvtidbase =
287 ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvtidbase);
288 dd->ipath_rcvegrcnt =
289 ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvegrcnt);
290 dd->ipath_rcvegrbase =
291 ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvegrbase);
292 dd->ipath_palign =
293 ipath_read_kreg32(dd, dd->ipath_kregs->kr_pagealign);
294 dd->ipath_piobufbase =
295 ipath_read_kreg64(dd, dd->ipath_kregs->kr_sendpiobufbase);
296 val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_sendpiosize);
297 dd->ipath_piosize2k = val & ~0U;
298 dd->ipath_piosize4k = val >> 32;
299 if (dd->ipath_piosize4k == 0 && ipath_mtu4096)
300 ipath_mtu4096 = 0; /* 4KB not supported by this chip */
301 dd->ipath_ibmtu = ipath_mtu4096 ? 4096 : 2048;
302 val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_sendpiobufcnt);
303 dd->ipath_piobcnt2k = val & ~0U;
304 dd->ipath_piobcnt4k = val >> 32;
305 dd->ipath_pio2kbase =
306 (u32 __iomem *) (((char __iomem *) dd->ipath_kregbase) +
307 (dd->ipath_piobufbase & 0xffffffff));
308 if (dd->ipath_piobcnt4k) {
309 dd->ipath_pio4kbase = (u32 __iomem *)
310 (((char __iomem *) dd->ipath_kregbase) +
311 (dd->ipath_piobufbase >> 32));
312 /*
313 * 4K buffers take 2 pages; we use roundup just to be
314 * paranoid; we calculate it once here, rather than on
315 * ever buf allocate
316 */
317 dd->ipath_4kalign = ALIGN(dd->ipath_piosize4k,
318 dd->ipath_palign);
319 ipath_dbg("%u 2k(%x) piobufs @ %p, %u 4k(%x) @ %p "
320 "(%x aligned)\n",
321 dd->ipath_piobcnt2k, dd->ipath_piosize2k,
322 dd->ipath_pio2kbase, dd->ipath_piobcnt4k,
323 dd->ipath_piosize4k, dd->ipath_pio4kbase,
324 dd->ipath_4kalign);
325 }
326 else ipath_dbg("%u 2k piobufs @ %p\n",
327 dd->ipath_piobcnt2k, dd->ipath_pio2kbase);
328
329done:
330 return ret;
331}
332
333/**
334 * init_chip_reset - re-initialize after a reset, or enable
335 * @dd: the infinipath device
336 *
337 * sanity check at least some of the values after reset, and
338 * ensure no receive or transmit (explicitly, in case reset
339 * failed
340 */
341static int init_chip_reset(struct ipath_devdata *dd)
342{
343 u32 rtmp;
344 int i;
345 unsigned long flags;
346
347 /*
348 * ensure chip does no sends or receives, tail updates, or
349 * pioavail updates while we re-initialize
350 */
351 dd->ipath_rcvctrl &= ~(1ULL << dd->ipath_r_tailupd_shift);
352 for (i = 0; i < dd->ipath_portcnt; i++) {
353 clear_bit(dd->ipath_r_portenable_shift + i,
354 &dd->ipath_rcvctrl);
355 clear_bit(dd->ipath_r_intravail_shift + i,
356 &dd->ipath_rcvctrl);
357 }
358 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
359 dd->ipath_rcvctrl);
360
361 spin_lock_irqsave(&dd->ipath_sendctrl_lock, flags);
362 dd->ipath_sendctrl = 0U; /* no sdma, etc */
363 ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl, dd->ipath_sendctrl);
364 ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
365 spin_unlock_irqrestore(&dd->ipath_sendctrl_lock, flags);
366
367 ipath_write_kreg(dd, dd->ipath_kregs->kr_control, 0ULL);
368
369 rtmp = ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvtidcnt);
370 if (rtmp != dd->ipath_rcvtidcnt)
371 dev_info(&dd->pcidev->dev, "tidcnt was %u before "
372 "reset, now %u, using original\n",
373 dd->ipath_rcvtidcnt, rtmp);
374 rtmp = ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvtidbase);
375 if (rtmp != dd->ipath_rcvtidbase)
376 dev_info(&dd->pcidev->dev, "tidbase was %u before "
377 "reset, now %u, using original\n",
378 dd->ipath_rcvtidbase, rtmp);
379 rtmp = ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvegrcnt);
380 if (rtmp != dd->ipath_rcvegrcnt)
381 dev_info(&dd->pcidev->dev, "egrcnt was %u before "
382 "reset, now %u, using original\n",
383 dd->ipath_rcvegrcnt, rtmp);
384 rtmp = ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvegrbase);
385 if (rtmp != dd->ipath_rcvegrbase)
386 dev_info(&dd->pcidev->dev, "egrbase was %u before "
387 "reset, now %u, using original\n",
388 dd->ipath_rcvegrbase, rtmp);
389
390 return 0;
391}
392
393static int init_pioavailregs(struct ipath_devdata *dd)
394{
395 int ret;
396
397 dd->ipath_pioavailregs_dma = dma_alloc_coherent(
398 &dd->pcidev->dev, PAGE_SIZE, &dd->ipath_pioavailregs_phys,
399 GFP_KERNEL);
400 if (!dd->ipath_pioavailregs_dma) {
401 ipath_dev_err(dd, "failed to allocate PIOavail reg area "
402 "in memory\n");
403 ret = -ENOMEM;
404 goto done;
405 }
406
407 /*
408 * we really want L2 cache aligned, but for current CPUs of
409 * interest, they are the same.
410 */
411 dd->ipath_statusp = (u64 *)
412 ((char *)dd->ipath_pioavailregs_dma +
413 ((2 * L1_CACHE_BYTES +
414 dd->ipath_pioavregs * sizeof(u64)) & ~L1_CACHE_BYTES));
415 /* copy the current value now that it's really allocated */
416 *dd->ipath_statusp = dd->_ipath_status;
417 /*
418 * setup buffer to hold freeze msg, accessible to apps,
419 * following statusp
420 */
421 dd->ipath_freezemsg = (char *)&dd->ipath_statusp[1];
422 /* and its length */
423 dd->ipath_freezelen = L1_CACHE_BYTES - sizeof(dd->ipath_statusp[0]);
424
425 ret = 0;
426
427done:
428 return ret;
429}
430
431/**
432 * init_shadow_tids - allocate the shadow TID array
433 * @dd: the infinipath device
434 *
435 * allocate the shadow TID array, so we can ipath_munlock previous
436 * entries. It may make more sense to move the pageshadow to the
437 * port data structure, so we only allocate memory for ports actually
438 * in use, since we at 8k per port, now.
439 */
440static void init_shadow_tids(struct ipath_devdata *dd)
441{
442 struct page **pages;
443 dma_addr_t *addrs;
444
445 pages = vzalloc(dd->ipath_cfgports * dd->ipath_rcvtidcnt *
446 sizeof(struct page *));
447 if (!pages) {
448 ipath_dev_err(dd, "failed to allocate shadow page * "
449 "array, no expected sends!\n");
450 dd->ipath_pageshadow = NULL;
451 return;
452 }
453
454 addrs = vmalloc(dd->ipath_cfgports * dd->ipath_rcvtidcnt *
455 sizeof(dma_addr_t));
456 if (!addrs) {
457 ipath_dev_err(dd, "failed to allocate shadow dma handle "
458 "array, no expected sends!\n");
459 vfree(pages);
460 dd->ipath_pageshadow = NULL;
461 return;
462 }
463
464 dd->ipath_pageshadow = pages;
465 dd->ipath_physshadow = addrs;
466}
467
468static void enable_chip(struct ipath_devdata *dd, int reinit)
469{
470 u32 val;
471 u64 rcvmask;
472 unsigned long flags;
473 int i;
474
475 if (!reinit)
476 init_waitqueue_head(&ipath_state_wait);
477
478 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
479 dd->ipath_rcvctrl);
480
481 spin_lock_irqsave(&dd->ipath_sendctrl_lock, flags);
482 /* Enable PIO send, and update of PIOavail regs to memory. */
483 dd->ipath_sendctrl = INFINIPATH_S_PIOENABLE |
484 INFINIPATH_S_PIOBUFAVAILUPD;
485
486 /*
487 * Set the PIO avail update threshold to host memory
488 * on chips that support it.
489 */
490 if (dd->ipath_pioupd_thresh)
491 dd->ipath_sendctrl |= dd->ipath_pioupd_thresh
492 << INFINIPATH_S_UPDTHRESH_SHIFT;
493 ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl, dd->ipath_sendctrl);
494 ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
495 spin_unlock_irqrestore(&dd->ipath_sendctrl_lock, flags);
496
497 /*
498 * Enable kernel ports' receive and receive interrupt.
499 * Other ports done as user opens and inits them.
500 */
501 rcvmask = 1ULL;
502 dd->ipath_rcvctrl |= (rcvmask << dd->ipath_r_portenable_shift) |
503 (rcvmask << dd->ipath_r_intravail_shift);
504 if (!(dd->ipath_flags & IPATH_NODMA_RTAIL))
505 dd->ipath_rcvctrl |= (1ULL << dd->ipath_r_tailupd_shift);
506
507 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
508 dd->ipath_rcvctrl);
509
510 /*
511 * now ready for use. this should be cleared whenever we
512 * detect a reset, or initiate one.
513 */
514 dd->ipath_flags |= IPATH_INITTED;
515
516 /*
517 * Init our shadow copies of head from tail values,
518 * and write head values to match.
519 */
520 val = ipath_read_ureg32(dd, ur_rcvegrindextail, 0);
521 ipath_write_ureg(dd, ur_rcvegrindexhead, val, 0);
522
523 /* Initialize so we interrupt on next packet received */
524 ipath_write_ureg(dd, ur_rcvhdrhead,
525 dd->ipath_rhdrhead_intr_off |
526 dd->ipath_pd[0]->port_head, 0);
527
528 /*
529 * by now pioavail updates to memory should have occurred, so
530 * copy them into our working/shadow registers; this is in
531 * case something went wrong with abort, but mostly to get the
532 * initial values of the generation bit correct.
533 */
534 for (i = 0; i < dd->ipath_pioavregs; i++) {
535 __le64 pioavail;
536
537 /*
538 * Chip Errata bug 6641; even and odd qwords>3 are swapped.
539 */
540 if (i > 3 && (dd->ipath_flags & IPATH_SWAP_PIOBUFS))
541 pioavail = dd->ipath_pioavailregs_dma[i ^ 1];
542 else
543 pioavail = dd->ipath_pioavailregs_dma[i];
544 /*
545 * don't need to worry about ipath_pioavailkernel here
546 * because we will call ipath_chg_pioavailkernel() later
547 * in initialization, to busy out buffers as needed
548 */
549 dd->ipath_pioavailshadow[i] = le64_to_cpu(pioavail);
550 }
551 /* can get counters, stats, etc. */
552 dd->ipath_flags |= IPATH_PRESENT;
553}
554
555static int init_housekeeping(struct ipath_devdata *dd, int reinit)
556{
557 char boardn[40];
558 int ret = 0;
559
560 /*
561 * have to clear shadow copies of registers at init that are
562 * not otherwise set here, or all kinds of bizarre things
563 * happen with driver on chip reset
564 */
565 dd->ipath_rcvhdrsize = 0;
566
567 /*
568 * Don't clear ipath_flags as 8bit mode was set before
569 * entering this func. However, we do set the linkstate to
570 * unknown, so we can watch for a transition.
571 * PRESENT is set because we want register reads to work,
572 * and the kernel infrastructure saw it in config space;
573 * We clear it if we have failures.
574 */
575 dd->ipath_flags |= IPATH_LINKUNK | IPATH_PRESENT;
576 dd->ipath_flags &= ~(IPATH_LINKACTIVE | IPATH_LINKARMED |
577 IPATH_LINKDOWN | IPATH_LINKINIT);
578
579 ipath_cdbg(VERBOSE, "Try to read spc chip revision\n");
580 dd->ipath_revision =
581 ipath_read_kreg64(dd, dd->ipath_kregs->kr_revision);
582
583 /*
584 * set up fundamental info we need to use the chip; we assume
585 * if the revision reg and these regs are OK, we don't need to
586 * special case the rest
587 */
588 dd->ipath_sregbase =
589 ipath_read_kreg32(dd, dd->ipath_kregs->kr_sendregbase);
590 dd->ipath_cregbase =
591 ipath_read_kreg32(dd, dd->ipath_kregs->kr_counterregbase);
592 dd->ipath_uregbase =
593 ipath_read_kreg32(dd, dd->ipath_kregs->kr_userregbase);
594 ipath_cdbg(VERBOSE, "ipath_kregbase %p, sendbase %x usrbase %x, "
595 "cntrbase %x\n", dd->ipath_kregbase, dd->ipath_sregbase,
596 dd->ipath_uregbase, dd->ipath_cregbase);
597 if ((dd->ipath_revision & 0xffffffff) == 0xffffffff
598 || (dd->ipath_sregbase & 0xffffffff) == 0xffffffff
599 || (dd->ipath_cregbase & 0xffffffff) == 0xffffffff
600 || (dd->ipath_uregbase & 0xffffffff) == 0xffffffff) {
601 ipath_dev_err(dd, "Register read failures from chip, "
602 "giving up initialization\n");
603 dd->ipath_flags &= ~IPATH_PRESENT;
604 ret = -ENODEV;
605 goto done;
606 }
607
608
609 /* clear diagctrl register, in case diags were running and crashed */
610 ipath_write_kreg (dd, dd->ipath_kregs->kr_hwdiagctrl, 0);
611
612 /* clear the initial reset flag, in case first driver load */
613 ipath_write_kreg(dd, dd->ipath_kregs->kr_errorclear,
614 INFINIPATH_E_RESET);
615
616 ipath_cdbg(VERBOSE, "Revision %llx (PCI %x)\n",
617 (unsigned long long) dd->ipath_revision,
618 dd->ipath_pcirev);
619
620 if (((dd->ipath_revision >> INFINIPATH_R_SOFTWARE_SHIFT) &
621 INFINIPATH_R_SOFTWARE_MASK) != IPATH_CHIP_SWVERSION) {
622 ipath_dev_err(dd, "Driver only handles version %d, "
623 "chip swversion is %d (%llx), failng\n",
624 IPATH_CHIP_SWVERSION,
625 (int)(dd->ipath_revision >>
626 INFINIPATH_R_SOFTWARE_SHIFT) &
627 INFINIPATH_R_SOFTWARE_MASK,
628 (unsigned long long) dd->ipath_revision);
629 ret = -ENOSYS;
630 goto done;
631 }
632 dd->ipath_majrev = (u8) ((dd->ipath_revision >>
633 INFINIPATH_R_CHIPREVMAJOR_SHIFT) &
634 INFINIPATH_R_CHIPREVMAJOR_MASK);
635 dd->ipath_minrev = (u8) ((dd->ipath_revision >>
636 INFINIPATH_R_CHIPREVMINOR_SHIFT) &
637 INFINIPATH_R_CHIPREVMINOR_MASK);
638 dd->ipath_boardrev = (u8) ((dd->ipath_revision >>
639 INFINIPATH_R_BOARDID_SHIFT) &
640 INFINIPATH_R_BOARDID_MASK);
641
642 ret = dd->ipath_f_get_boardname(dd, boardn, sizeof boardn);
643
644 snprintf(dd->ipath_boardversion, sizeof(dd->ipath_boardversion),
645 "ChipABI %u.%u, %s, InfiniPath%u %u.%u, PCI %u, "
646 "SW Compat %u\n",
647 IPATH_CHIP_VERS_MAJ, IPATH_CHIP_VERS_MIN, boardn,
648 (unsigned)(dd->ipath_revision >> INFINIPATH_R_ARCH_SHIFT) &
649 INFINIPATH_R_ARCH_MASK,
650 dd->ipath_majrev, dd->ipath_minrev, dd->ipath_pcirev,
651 (unsigned)(dd->ipath_revision >>
652 INFINIPATH_R_SOFTWARE_SHIFT) &
653 INFINIPATH_R_SOFTWARE_MASK);
654
655 ipath_dbg("%s", dd->ipath_boardversion);
656
657 if (ret)
658 goto done;
659
660 if (reinit)
661 ret = init_chip_reset(dd);
662 else
663 ret = init_chip_first(dd);
664
665done:
666 return ret;
667}
668
669static void verify_interrupt(unsigned long opaque)
670{
671 struct ipath_devdata *dd = (struct ipath_devdata *) opaque;
672
673 if (!dd)
674 return; /* being torn down */
675
676 /*
677 * If we don't have any interrupts, let the user know and
678 * don't bother checking again.
679 */
680 if (dd->ipath_int_counter == 0) {
681 if (!dd->ipath_f_intr_fallback(dd))
682 dev_err(&dd->pcidev->dev, "No interrupts detected, "
683 "not usable.\n");
684 else /* re-arm the timer to see if fallback works */
685 mod_timer(&dd->ipath_intrchk_timer, jiffies + HZ/2);
686 } else
687 ipath_cdbg(VERBOSE, "%u interrupts at timer check\n",
688 dd->ipath_int_counter);
689}
690
691/**
692 * ipath_init_chip - do the actual initialization sequence on the chip
693 * @dd: the infinipath device
694 * @reinit: reinitializing, so don't allocate new memory
695 *
696 * Do the actual initialization sequence on the chip. This is done
697 * both from the init routine called from the PCI infrastructure, and
698 * when we reset the chip, or detect that it was reset internally,
699 * or it's administratively re-enabled.
700 *
701 * Memory allocation here and in called routines is only done in
702 * the first case (reinit == 0). We have to be careful, because even
703 * without memory allocation, we need to re-write all the chip registers
704 * TIDs, etc. after the reset or enable has completed.
705 */
706int ipath_init_chip(struct ipath_devdata *dd, int reinit)
707{
708 int ret = 0;
709 u32 kpiobufs, defkbufs;
710 u32 piobufs, uports;
711 u64 val;
712 struct ipath_portdata *pd;
713 gfp_t gfp_flags = GFP_USER | __GFP_COMP;
714
715 ret = init_housekeeping(dd, reinit);
716 if (ret)
717 goto done;
718
719 /*
720 * we ignore most issues after reporting them, but have to specially
721 * handle hardware-disabled chips.
722 */
723 if (ret == 2) {
724 /* unique error, known to ipath_init_one */
725 ret = -EPERM;
726 goto done;
727 }
728
729 /*
730 * We could bump this to allow for full rcvegrcnt + rcvtidcnt,
731 * but then it no longer nicely fits power of two, and since
732 * we now use routines that backend onto __get_free_pages, the
733 * rest would be wasted.
734 */
735 dd->ipath_rcvhdrcnt = max(dd->ipath_p0_rcvegrcnt, dd->ipath_rcvegrcnt);
736 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvhdrcnt,
737 dd->ipath_rcvhdrcnt);
738
739 /*
740 * Set up the shadow copies of the piobufavail registers,
741 * which we compare against the chip registers for now, and
742 * the in memory DMA'ed copies of the registers. This has to
743 * be done early, before we calculate lastport, etc.
744 */
745 piobufs = dd->ipath_piobcnt2k + dd->ipath_piobcnt4k;
746 /*
747 * calc number of pioavail registers, and save it; we have 2
748 * bits per buffer.
749 */
750 dd->ipath_pioavregs = ALIGN(piobufs, sizeof(u64) * BITS_PER_BYTE / 2)
751 / (sizeof(u64) * BITS_PER_BYTE / 2);
752 uports = dd->ipath_cfgports ? dd->ipath_cfgports - 1 : 0;
753 if (piobufs > 144)
754 defkbufs = 32 + dd->ipath_pioreserved;
755 else
756 defkbufs = 16 + dd->ipath_pioreserved;
757
758 if (ipath_kpiobufs && (ipath_kpiobufs +
759 (uports * IPATH_MIN_USER_PORT_BUFCNT)) > piobufs) {
760 int i = (int) piobufs -
761 (int) (uports * IPATH_MIN_USER_PORT_BUFCNT);
762 if (i < 1)
763 i = 1;
764 dev_info(&dd->pcidev->dev, "Allocating %d PIO bufs of "
765 "%d for kernel leaves too few for %d user ports "
766 "(%d each); using %u\n", ipath_kpiobufs,
767 piobufs, uports, IPATH_MIN_USER_PORT_BUFCNT, i);
768 /*
769 * shouldn't change ipath_kpiobufs, because could be
770 * different for different devices...
771 */
772 kpiobufs = i;
773 } else if (ipath_kpiobufs)
774 kpiobufs = ipath_kpiobufs;
775 else
776 kpiobufs = defkbufs;
777 dd->ipath_lastport_piobuf = piobufs - kpiobufs;
778 dd->ipath_pbufsport =
779 uports ? dd->ipath_lastport_piobuf / uports : 0;
780 /* if not an even divisor, some user ports get extra buffers */
781 dd->ipath_ports_extrabuf = dd->ipath_lastport_piobuf -
782 (dd->ipath_pbufsport * uports);
783 if (dd->ipath_ports_extrabuf)
784 ipath_dbg("%u pbufs/port leaves some unused, add 1 buffer to "
785 "ports <= %u\n", dd->ipath_pbufsport,
786 dd->ipath_ports_extrabuf);
787 dd->ipath_lastpioindex = 0;
788 dd->ipath_lastpioindexl = dd->ipath_piobcnt2k;
789 /* ipath_pioavailshadow initialized earlier */
790 ipath_cdbg(VERBOSE, "%d PIO bufs for kernel out of %d total %u "
791 "each for %u user ports\n", kpiobufs,
792 piobufs, dd->ipath_pbufsport, uports);
793 ret = dd->ipath_f_early_init(dd);
794 if (ret) {
795 ipath_dev_err(dd, "Early initialization failure\n");
796 goto done;
797 }
798
799 /*
800 * Early_init sets rcvhdrentsize and rcvhdrsize, so this must be
801 * done after early_init.
802 */
803 dd->ipath_hdrqlast =
804 dd->ipath_rcvhdrentsize * (dd->ipath_rcvhdrcnt - 1);
805 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvhdrentsize,
806 dd->ipath_rcvhdrentsize);
807 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvhdrsize,
808 dd->ipath_rcvhdrsize);
809
810 if (!reinit) {
811 ret = init_pioavailregs(dd);
812 init_shadow_tids(dd);
813 if (ret)
814 goto done;
815 }
816
817 ipath_write_kreg(dd, dd->ipath_kregs->kr_sendpioavailaddr,
818 dd->ipath_pioavailregs_phys);
819
820 /*
821 * this is to detect s/w errors, which the h/w works around by
822 * ignoring the low 6 bits of address, if it wasn't aligned.
823 */
824 val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_sendpioavailaddr);
825 if (val != dd->ipath_pioavailregs_phys) {
826 ipath_dev_err(dd, "Catastrophic software error, "
827 "SendPIOAvailAddr written as %lx, "
828 "read back as %llx\n",
829 (unsigned long) dd->ipath_pioavailregs_phys,
830 (unsigned long long) val);
831 ret = -EINVAL;
832 goto done;
833 }
834
835 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvbthqp, IPATH_KD_QP);
836
837 /*
838 * make sure we are not in freeze, and PIO send enabled, so
839 * writes to pbc happen
840 */
841 ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrmask, 0ULL);
842 ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrclear,
843 ~0ULL&~INFINIPATH_HWE_MEMBISTFAILED);
844 ipath_write_kreg(dd, dd->ipath_kregs->kr_control, 0ULL);
845
846 /*
847 * before error clears, since we expect serdes pll errors during
848 * this, the first time after reset
849 */
850 if (bringup_link(dd)) {
851 dev_info(&dd->pcidev->dev, "Failed to bringup IB link\n");
852 ret = -ENETDOWN;
853 goto done;
854 }
855
856 /*
857 * clear any "expected" hwerrs from reset and/or initialization
858 * clear any that aren't enabled (at least this once), and then
859 * set the enable mask
860 */
861 dd->ipath_f_init_hwerrors(dd);
862 ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrclear,
863 ~0ULL&~INFINIPATH_HWE_MEMBISTFAILED);
864 ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrmask,
865 dd->ipath_hwerrmask);
866
867 /* clear all */
868 ipath_write_kreg(dd, dd->ipath_kregs->kr_errorclear, -1LL);
869 /* enable errors that are masked, at least this first time. */
870 ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
871 ~dd->ipath_maskederrs);
872 dd->ipath_maskederrs = 0; /* don't re-enable ignored in timer */
873 dd->ipath_errormask =
874 ipath_read_kreg64(dd, dd->ipath_kregs->kr_errormask);
875 /* clear any interrupts up to this point (ints still not enabled) */
876 ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, -1LL);
877
878 dd->ipath_f_tidtemplate(dd);
879
880 /*
881 * Set up the port 0 (kernel) rcvhdr q and egr TIDs. If doing
882 * re-init, the simplest way to handle this is to free
883 * existing, and re-allocate.
884 * Need to re-create rest of port 0 portdata as well.
885 */
886 pd = dd->ipath_pd[0];
887 if (reinit) {
888 struct ipath_portdata *npd;
889
890 /*
891 * Alloc and init new ipath_portdata for port0,
892 * Then free old pd. Could lead to fragmentation, but also
893 * makes later support for hot-swap easier.
894 */
895 npd = create_portdata0(dd);
896 if (npd) {
897 ipath_free_pddata(dd, pd);
898 dd->ipath_pd[0] = npd;
899 pd = npd;
900 } else {
901 ipath_dev_err(dd, "Unable to allocate portdata"
902 " for port 0, failing\n");
903 ret = -ENOMEM;
904 goto done;
905 }
906 }
907 ret = ipath_create_rcvhdrq(dd, pd);
908 if (!ret)
909 ret = create_port0_egr(dd);
910 if (ret) {
911 ipath_dev_err(dd, "failed to allocate kernel port's "
912 "rcvhdrq and/or egr bufs\n");
913 goto done;
914 }
915 else
916 enable_chip(dd, reinit);
917
918 /* after enable_chip, so pioavailshadow setup */
919 ipath_chg_pioavailkernel(dd, 0, piobufs, 1);
920
921 /*
922 * Cancel any possible active sends from early driver load.
923 * Follows early_init because some chips have to initialize
924 * PIO buffers in early_init to avoid false parity errors.
925 * After enable and ipath_chg_pioavailkernel so we can safely
926 * enable pioavail updates and PIOENABLE; packets are now
927 * ready to go out.
928 */
929 ipath_cancel_sends(dd, 1);
930
931 if (!reinit) {
932 /*
933 * Used when we close a port, for DMA already in flight
934 * at close.
935 */
936 dd->ipath_dummy_hdrq = dma_alloc_coherent(
937 &dd->pcidev->dev, dd->ipath_pd[0]->port_rcvhdrq_size,
938 &dd->ipath_dummy_hdrq_phys,
939 gfp_flags);
940 if (!dd->ipath_dummy_hdrq) {
941 dev_info(&dd->pcidev->dev,
942 "Couldn't allocate 0x%lx bytes for dummy hdrq\n",
943 dd->ipath_pd[0]->port_rcvhdrq_size);
944 /* fallback to just 0'ing */
945 dd->ipath_dummy_hdrq_phys = 0UL;
946 }
947 }
948
949 /*
950 * cause retrigger of pending interrupts ignored during init,
951 * even if we had errors
952 */
953 ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, 0ULL);
954
955 if (!dd->ipath_stats_timer_active) {
956 /*
957 * first init, or after an admin disable/enable
958 * set up stats retrieval timer, even if we had errors
959 * in last portion of setup
960 */
961 init_timer(&dd->ipath_stats_timer);
962 dd->ipath_stats_timer.function = ipath_get_faststats;
963 dd->ipath_stats_timer.data = (unsigned long) dd;
964 /* every 5 seconds; */
965 dd->ipath_stats_timer.expires = jiffies + 5 * HZ;
966 /* takes ~16 seconds to overflow at full IB 4x bandwdith */
967 add_timer(&dd->ipath_stats_timer);
968 dd->ipath_stats_timer_active = 1;
969 }
970
971 /* Set up SendDMA if chip supports it */
972 if (dd->ipath_flags & IPATH_HAS_SEND_DMA)
973 ret = setup_sdma(dd);
974
975 /* Set up HoL state */
976 init_timer(&dd->ipath_hol_timer);
977 dd->ipath_hol_timer.function = ipath_hol_event;
978 dd->ipath_hol_timer.data = (unsigned long)dd;
979 dd->ipath_hol_state = IPATH_HOL_UP;
980
981done:
982 if (!ret) {
983 *dd->ipath_statusp |= IPATH_STATUS_CHIP_PRESENT;
984 if (!dd->ipath_f_intrsetup(dd)) {
985 /* now we can enable all interrupts from the chip */
986 ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask,
987 -1LL);
988 /* force re-interrupt of any pending interrupts. */
989 ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear,
990 0ULL);
991 /* chip is usable; mark it as initialized */
992 *dd->ipath_statusp |= IPATH_STATUS_INITTED;
993
994 /*
995 * setup to verify we get an interrupt, and fallback
996 * to an alternate if necessary and possible
997 */
998 if (!reinit) {
999 init_timer(&dd->ipath_intrchk_timer);
1000 dd->ipath_intrchk_timer.function =
1001 verify_interrupt;
1002 dd->ipath_intrchk_timer.data =
1003 (unsigned long) dd;
1004 }
1005 dd->ipath_intrchk_timer.expires = jiffies + HZ/2;
1006 add_timer(&dd->ipath_intrchk_timer);
1007 } else
1008 ipath_dev_err(dd, "No interrupts enabled, couldn't "
1009 "setup interrupt address\n");
1010
1011 if (dd->ipath_cfgports > ipath_stats.sps_nports)
1012 /*
1013 * sps_nports is a global, so, we set it to
1014 * the highest number of ports of any of the
1015 * chips we find; we never decrement it, at
1016 * least for now. Since this might have changed
1017 * over disable/enable or prior to reset, always
1018 * do the check and potentially adjust.
1019 */
1020 ipath_stats.sps_nports = dd->ipath_cfgports;
1021 } else
1022 ipath_dbg("Failed (%d) to initialize chip\n", ret);
1023
1024 /* if ret is non-zero, we probably should do some cleanup
1025 here... */
1026 return ret;
1027}
1028
1029static int ipath_set_kpiobufs(const char *str, struct kernel_param *kp)
1030{
1031 struct ipath_devdata *dd;
1032 unsigned long flags;
1033 unsigned short val;
1034 int ret;
1035
1036 ret = ipath_parse_ushort(str, &val);
1037
1038 spin_lock_irqsave(&ipath_devs_lock, flags);
1039
1040 if (ret < 0)
1041 goto bail;
1042
1043 if (val == 0) {
1044 ret = -EINVAL;
1045 goto bail;
1046 }
1047
1048 list_for_each_entry(dd, &ipath_dev_list, ipath_list) {
1049 if (dd->ipath_kregbase)
1050 continue;
1051 if (val > (dd->ipath_piobcnt2k + dd->ipath_piobcnt4k -
1052 (dd->ipath_cfgports *
1053 IPATH_MIN_USER_PORT_BUFCNT)))
1054 {
1055 ipath_dev_err(
1056 dd,
1057 "Allocating %d PIO bufs for kernel leaves "
1058 "too few for %d user ports (%d each)\n",
1059 val, dd->ipath_cfgports - 1,
1060 IPATH_MIN_USER_PORT_BUFCNT);
1061 ret = -EINVAL;
1062 goto bail;
1063 }
1064 dd->ipath_lastport_piobuf =
1065 dd->ipath_piobcnt2k + dd->ipath_piobcnt4k - val;
1066 }
1067
1068 ipath_kpiobufs = val;
1069 ret = 0;
1070bail:
1071 spin_unlock_irqrestore(&ipath_devs_lock, flags);
1072
1073 return ret;
1074}