1 /*
2 * Copyright (c) 2008, 2009 QLogic Corporation. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33 #include <linux/pci.h>
34 #include <linux/io.h>
35 #include <linux/delay.h>
36 #include <linux/vmalloc.h>
37 #include <linux/aer.h>
38 #include <linux/module.h>
39
40 #include "qib.h"
41
42 /*
43 * This file contains PCIe utility routines that are common to the
44 * various QLogic InfiniPath adapters
45 */
46
47 /*
48 * Code to adjust PCIe capabilities.
49 * To minimize the change footprint, we call it
50 * from qib_pcie_params, which every chip-specific
51 * file calls, even though this violates some
52 * expectations of harmlessness.
53 */
54 static int qib_tune_pcie_caps(struct qib_devdata *);
55 static int qib_tune_pcie_coalesce(struct qib_devdata *);
56
57 /*
58 * Do all the common PCIe setup and initialization.
59 * devdata is not yet allocated, and is not allocated until after this
60 * routine returns success. Therefore qib_dev_err() can't be used for error
61 * printing.
62 */
qib_pcie_init(struct pci_dev * pdev,const struct pci_device_id * ent)63 int qib_pcie_init(struct pci_dev *pdev, const struct pci_device_id *ent)
64 {
65 int ret;
66
67 ret = pci_enable_device(pdev);
68 if (ret) {
69 /*
70 * This can happen (in theory) iff:
71 * We did a chip reset, and then failed to reprogram the
72 * BAR, or the chip reset due to an internal error. We then
73 * unloaded the driver and reloaded it.
74 *
75 * Both reset cases set the BAR back to initial state. For
76 * the latter case, the AER sticky error bit at offset 0x718
77 * should be set, but the Linux kernel doesn't yet know
78 * about that, it appears. If the original BAR was retained
79 * in the kernel data structures, this may be OK.
80 */
81 qib_early_err(&pdev->dev, "pci enable failed: error %d\n",
82 -ret);
83 goto done;
84 }
85
86 ret = pci_request_regions(pdev, QIB_DRV_NAME);
87 if (ret) {
88 qib_devinfo(pdev, "pci_request_regions fails: err %d\n", -ret);
89 goto bail;
90 }
91
92 ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
93 if (ret) {
94 /*
95 * If the 64 bit setup fails, try 32 bit. Some systems
96 * do not setup 64 bit maps on systems with 2GB or less
97 * memory installed.
98 */
99 ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
100 if (ret) {
101 qib_devinfo(pdev, "Unable to set DMA mask: %d\n", ret);
102 goto bail;
103 }
104 ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
105 } else
106 ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
107 if (ret) {
108 qib_early_err(&pdev->dev,
109 "Unable to set DMA consistent mask: %d\n", ret);
110 goto bail;
111 }
112
113 pci_set_master(pdev);
114 ret = pci_enable_pcie_error_reporting(pdev);
115 if (ret) {
116 qib_early_err(&pdev->dev,
117 "Unable to enable pcie error reporting: %d\n",
118 ret);
119 ret = 0;
120 }
121 goto done;
122
123 bail:
124 pci_disable_device(pdev);
125 pci_release_regions(pdev);
126 done:
127 return ret;
128 }
129
130 /*
131 * Do remaining PCIe setup, once dd is allocated, and save away
132 * fields required to re-initialize after a chip reset, or for
133 * various other purposes
134 */
qib_pcie_ddinit(struct qib_devdata * dd,struct pci_dev * pdev,const struct pci_device_id * ent)135 int qib_pcie_ddinit(struct qib_devdata *dd, struct pci_dev *pdev,
136 const struct pci_device_id *ent)
137 {
138 unsigned long len;
139 resource_size_t addr;
140
141 dd->pcidev = pdev;
142 pci_set_drvdata(pdev, dd);
143
144 addr = pci_resource_start(pdev, 0);
145 len = pci_resource_len(pdev, 0);
146
147 #if defined(__powerpc__)
148 /* There isn't a generic way to specify writethrough mappings */
149 dd->kregbase = __ioremap(addr, len, _PAGE_NO_CACHE | _PAGE_WRITETHRU);
150 #else
151 dd->kregbase = ioremap_nocache(addr, len);
152 #endif
153
154 if (!dd->kregbase)
155 return -ENOMEM;
156
157 dd->kregend = (u64 __iomem *)((void __iomem *) dd->kregbase + len);
158 dd->physaddr = addr; /* used for io_remap, etc. */
159
160 /*
161 * Save BARs to rewrite after device reset. Save all 64 bits of
162 * BAR, just in case.
163 */
164 dd->pcibar0 = addr;
165 dd->pcibar1 = addr >> 32;
166 dd->deviceid = ent->device; /* save for later use */
167 dd->vendorid = ent->vendor;
168
169 return 0;
170 }
171
172 /*
173 * Do PCIe cleanup, after chip-specific cleanup, etc. Just prior
174 * to releasing the dd memory.
175 * void because none of the core pcie cleanup returns are void
176 */
qib_pcie_ddcleanup(struct qib_devdata * dd)177 void qib_pcie_ddcleanup(struct qib_devdata *dd)
178 {
179 u64 __iomem *base = (void __iomem *) dd->kregbase;
180
181 dd->kregbase = NULL;
182 iounmap(base);
183 if (dd->piobase)
184 iounmap(dd->piobase);
185 if (dd->userbase)
186 iounmap(dd->userbase);
187 if (dd->piovl15base)
188 iounmap(dd->piovl15base);
189
190 pci_disable_device(dd->pcidev);
191 pci_release_regions(dd->pcidev);
192
193 pci_set_drvdata(dd->pcidev, NULL);
194 }
195
qib_msix_setup(struct qib_devdata * dd,int pos,u32 * msixcnt,struct qib_msix_entry * qib_msix_entry)196 static void qib_msix_setup(struct qib_devdata *dd, int pos, u32 *msixcnt,
197 struct qib_msix_entry *qib_msix_entry)
198 {
199 int ret;
200 u32 tabsize = 0;
201 u16 msix_flags;
202 struct msix_entry *msix_entry;
203 int i;
204
205 /* We can't pass qib_msix_entry array to qib_msix_setup
206 * so use a dummy msix_entry array and copy the allocated
207 * irq back to the qib_msix_entry array. */
208 msix_entry = kmalloc(*msixcnt * sizeof(*msix_entry), GFP_KERNEL);
209 if (!msix_entry) {
210 ret = -ENOMEM;
211 goto do_intx;
212 }
213 for (i = 0; i < *msixcnt; i++)
214 msix_entry[i] = qib_msix_entry[i].msix;
215
216 pci_read_config_word(dd->pcidev, pos + PCI_MSIX_FLAGS, &msix_flags);
217 tabsize = 1 + (msix_flags & PCI_MSIX_FLAGS_QSIZE);
218 if (tabsize > *msixcnt)
219 tabsize = *msixcnt;
220 ret = pci_enable_msix(dd->pcidev, msix_entry, tabsize);
221 if (ret > 0) {
222 tabsize = ret;
223 ret = pci_enable_msix(dd->pcidev, msix_entry, tabsize);
224 }
225 do_intx:
226 if (ret) {
227 qib_dev_err(dd, "pci_enable_msix %d vectors failed: %d, "
228 "falling back to INTx\n", tabsize, ret);
229 tabsize = 0;
230 }
231 for (i = 0; i < tabsize; i++)
232 qib_msix_entry[i].msix = msix_entry[i];
233 kfree(msix_entry);
234 *msixcnt = tabsize;
235
236 if (ret)
237 qib_enable_intx(dd->pcidev);
238
239 }
240
241 /**
242 * We save the msi lo and hi values, so we can restore them after
243 * chip reset (the kernel PCI infrastructure doesn't yet handle that
244 * correctly.
245 */
qib_msi_setup(struct qib_devdata * dd,int pos)246 static int qib_msi_setup(struct qib_devdata *dd, int pos)
247 {
248 struct pci_dev *pdev = dd->pcidev;
249 u16 control;
250 int ret;
251
252 ret = pci_enable_msi(pdev);
253 if (ret)
254 qib_dev_err(dd, "pci_enable_msi failed: %d, "
255 "interrupts may not work\n", ret);
256 /* continue even if it fails, we may still be OK... */
257
258 pci_read_config_dword(pdev, pos + PCI_MSI_ADDRESS_LO,
259 &dd->msi_lo);
260 pci_read_config_dword(pdev, pos + PCI_MSI_ADDRESS_HI,
261 &dd->msi_hi);
262 pci_read_config_word(pdev, pos + PCI_MSI_FLAGS, &control);
263 /* now save the data (vector) info */
264 pci_read_config_word(pdev, pos + ((control & PCI_MSI_FLAGS_64BIT)
265 ? 12 : 8),
266 &dd->msi_data);
267 return ret;
268 }
269
qib_pcie_params(struct qib_devdata * dd,u32 minw,u32 * nent,struct qib_msix_entry * entry)270 int qib_pcie_params(struct qib_devdata *dd, u32 minw, u32 *nent,
271 struct qib_msix_entry *entry)
272 {
273 u16 linkstat, speed;
274 int pos = 0, pose, ret = 1;
275
276 pose = pci_pcie_cap(dd->pcidev);
277 if (!pose) {
278 qib_dev_err(dd, "Can't find PCI Express capability!\n");
279 /* set up something... */
280 dd->lbus_width = 1;
281 dd->lbus_speed = 2500; /* Gen1, 2.5GHz */
282 goto bail;
283 }
284
285 pos = pci_find_capability(dd->pcidev, PCI_CAP_ID_MSIX);
286 if (nent && *nent && pos) {
287 qib_msix_setup(dd, pos, nent, entry);
288 ret = 0; /* did it, either MSIx or INTx */
289 } else {
290 pos = pci_find_capability(dd->pcidev, PCI_CAP_ID_MSI);
291 if (pos)
292 ret = qib_msi_setup(dd, pos);
293 else
294 qib_dev_err(dd, "No PCI MSI or MSIx capability!\n");
295 }
296 if (!pos)
297 qib_enable_intx(dd->pcidev);
298
299 pci_read_config_word(dd->pcidev, pose + PCI_EXP_LNKSTA, &linkstat);
300 /*
301 * speed is bits 0-3, linkwidth is bits 4-8
302 * no defines for them in headers
303 */
304 speed = linkstat & 0xf;
305 linkstat >>= 4;
306 linkstat &= 0x1f;
307 dd->lbus_width = linkstat;
308
309 switch (speed) {
310 case 1:
311 dd->lbus_speed = 2500; /* Gen1, 2.5GHz */
312 break;
313 case 2:
314 dd->lbus_speed = 5000; /* Gen1, 5GHz */
315 break;
316 default: /* not defined, assume gen1 */
317 dd->lbus_speed = 2500;
318 break;
319 }
320
321 /*
322 * Check against expected pcie width and complain if "wrong"
323 * on first initialization, not afterwards (i.e., reset).
324 */
325 if (minw && linkstat < minw)
326 qib_dev_err(dd,
327 "PCIe width %u (x%u HCA), performance reduced\n",
328 linkstat, minw);
329
330 qib_tune_pcie_caps(dd);
331
332 qib_tune_pcie_coalesce(dd);
333
334 bail:
335 /* fill in string, even on errors */
336 snprintf(dd->lbus_info, sizeof(dd->lbus_info),
337 "PCIe,%uMHz,x%u\n", dd->lbus_speed, dd->lbus_width);
338 return ret;
339 }
340
341 /*
342 * Setup pcie interrupt stuff again after a reset. I'd like to just call
343 * pci_enable_msi() again for msi, but when I do that,
344 * the MSI enable bit doesn't get set in the command word, and
345 * we switch to to a different interrupt vector, which is confusing,
346 * so I instead just do it all inline. Perhaps somehow can tie this
347 * into the PCIe hotplug support at some point
348 */
qib_reinit_intr(struct qib_devdata * dd)349 int qib_reinit_intr(struct qib_devdata *dd)
350 {
351 int pos;
352 u16 control;
353 int ret = 0;
354
355 /* If we aren't using MSI, don't restore it */
356 if (!dd->msi_lo)
357 goto bail;
358
359 pos = pci_find_capability(dd->pcidev, PCI_CAP_ID_MSI);
360 if (!pos) {
361 qib_dev_err(dd, "Can't find MSI capability, "
362 "can't restore MSI settings\n");
363 ret = 0;
364 /* nothing special for MSIx, just MSI */
365 goto bail;
366 }
367 pci_write_config_dword(dd->pcidev, pos + PCI_MSI_ADDRESS_LO,
368 dd->msi_lo);
369 pci_write_config_dword(dd->pcidev, pos + PCI_MSI_ADDRESS_HI,
370 dd->msi_hi);
371 pci_read_config_word(dd->pcidev, pos + PCI_MSI_FLAGS, &control);
372 if (!(control & PCI_MSI_FLAGS_ENABLE)) {
373 control |= PCI_MSI_FLAGS_ENABLE;
374 pci_write_config_word(dd->pcidev, pos + PCI_MSI_FLAGS,
375 control);
376 }
377 /* now rewrite the data (vector) info */
378 pci_write_config_word(dd->pcidev, pos +
379 ((control & PCI_MSI_FLAGS_64BIT) ? 12 : 8),
380 dd->msi_data);
381 ret = 1;
382 bail:
383 if (!ret && (dd->flags & QIB_HAS_INTX)) {
384 qib_enable_intx(dd->pcidev);
385 ret = 1;
386 }
387
388 /* and now set the pci master bit again */
389 pci_set_master(dd->pcidev);
390
391 return ret;
392 }
393
394 /*
395 * Disable msi interrupt if enabled, and clear msi_lo.
396 * This is used primarily for the fallback to INTx, but
397 * is also used in reinit after reset, and during cleanup.
398 */
qib_nomsi(struct qib_devdata * dd)399 void qib_nomsi(struct qib_devdata *dd)
400 {
401 dd->msi_lo = 0;
402 pci_disable_msi(dd->pcidev);
403 }
404
405 /*
406 * Same as qib_nosmi, but for MSIx.
407 */
qib_nomsix(struct qib_devdata * dd)408 void qib_nomsix(struct qib_devdata *dd)
409 {
410 pci_disable_msix(dd->pcidev);
411 }
412
413 /*
414 * Similar to pci_intx(pdev, 1), except that we make sure
415 * msi(x) is off.
416 */
qib_enable_intx(struct pci_dev * pdev)417 void qib_enable_intx(struct pci_dev *pdev)
418 {
419 u16 cw, new;
420 int pos;
421
422 /* first, turn on INTx */
423 pci_read_config_word(pdev, PCI_COMMAND, &cw);
424 new = cw & ~PCI_COMMAND_INTX_DISABLE;
425 if (new != cw)
426 pci_write_config_word(pdev, PCI_COMMAND, new);
427
428 pos = pci_find_capability(pdev, PCI_CAP_ID_MSI);
429 if (pos) {
430 /* then turn off MSI */
431 pci_read_config_word(pdev, pos + PCI_MSI_FLAGS, &cw);
432 new = cw & ~PCI_MSI_FLAGS_ENABLE;
433 if (new != cw)
434 pci_write_config_word(pdev, pos + PCI_MSI_FLAGS, new);
435 }
436 pos = pci_find_capability(pdev, PCI_CAP_ID_MSIX);
437 if (pos) {
438 /* then turn off MSIx */
439 pci_read_config_word(pdev, pos + PCI_MSIX_FLAGS, &cw);
440 new = cw & ~PCI_MSIX_FLAGS_ENABLE;
441 if (new != cw)
442 pci_write_config_word(pdev, pos + PCI_MSIX_FLAGS, new);
443 }
444 }
445
446 /*
447 * These two routines are helper routines for the device reset code
448 * to move all the pcie code out of the chip-specific driver code.
449 */
qib_pcie_getcmd(struct qib_devdata * dd,u16 * cmd,u8 * iline,u8 * cline)450 void qib_pcie_getcmd(struct qib_devdata *dd, u16 *cmd, u8 *iline, u8 *cline)
451 {
452 pci_read_config_word(dd->pcidev, PCI_COMMAND, cmd);
453 pci_read_config_byte(dd->pcidev, PCI_INTERRUPT_LINE, iline);
454 pci_read_config_byte(dd->pcidev, PCI_CACHE_LINE_SIZE, cline);
455 }
456
qib_pcie_reenable(struct qib_devdata * dd,u16 cmd,u8 iline,u8 cline)457 void qib_pcie_reenable(struct qib_devdata *dd, u16 cmd, u8 iline, u8 cline)
458 {
459 int r;
460 r = pci_write_config_dword(dd->pcidev, PCI_BASE_ADDRESS_0,
461 dd->pcibar0);
462 if (r)
463 qib_dev_err(dd, "rewrite of BAR0 failed: %d\n", r);
464 r = pci_write_config_dword(dd->pcidev, PCI_BASE_ADDRESS_1,
465 dd->pcibar1);
466 if (r)
467 qib_dev_err(dd, "rewrite of BAR1 failed: %d\n", r);
468 /* now re-enable memory access, and restore cosmetic settings */
469 pci_write_config_word(dd->pcidev, PCI_COMMAND, cmd);
470 pci_write_config_byte(dd->pcidev, PCI_INTERRUPT_LINE, iline);
471 pci_write_config_byte(dd->pcidev, PCI_CACHE_LINE_SIZE, cline);
472 r = pci_enable_device(dd->pcidev);
473 if (r)
474 qib_dev_err(dd, "pci_enable_device failed after "
475 "reset: %d\n", r);
476 }
477
478 /* code to adjust PCIe capabilities. */
479
fld2val(int wd,int mask)480 static int fld2val(int wd, int mask)
481 {
482 int lsbmask;
483
484 if (!mask)
485 return 0;
486 wd &= mask;
487 lsbmask = mask ^ (mask & (mask - 1));
488 wd /= lsbmask;
489 return wd;
490 }
491
val2fld(int wd,int mask)492 static int val2fld(int wd, int mask)
493 {
494 int lsbmask;
495
496 if (!mask)
497 return 0;
498 lsbmask = mask ^ (mask & (mask - 1));
499 wd *= lsbmask;
500 return wd;
501 }
502
503 static int qib_pcie_coalesce;
504 module_param_named(pcie_coalesce, qib_pcie_coalesce, int, S_IRUGO);
505 MODULE_PARM_DESC(pcie_coalesce, "tune PCIe colescing on some Intel chipsets");
506
507 /*
508 * Enable PCIe completion and data coalescing, on Intel 5x00 and 7300
509 * chipsets. This is known to be unsafe for some revisions of some
510 * of these chipsets, with some BIOS settings, and enabling it on those
511 * systems may result in the system crashing, and/or data corruption.
512 */
qib_tune_pcie_coalesce(struct qib_devdata * dd)513 static int qib_tune_pcie_coalesce(struct qib_devdata *dd)
514 {
515 int r;
516 struct pci_dev *parent;
517 int ppos;
518 u16 devid;
519 u32 mask, bits, val;
520
521 if (!qib_pcie_coalesce)
522 return 0;
523
524 /* Find out supported and configured values for parent (root) */
525 parent = dd->pcidev->bus->self;
526 if (parent->bus->parent) {
527 qib_devinfo(dd->pcidev, "Parent not root\n");
528 return 1;
529 }
530 ppos = pci_pcie_cap(parent);
531 if (!ppos)
532 return 1;
533 if (parent->vendor != 0x8086)
534 return 1;
535
536 /*
537 * - bit 12: Max_rdcmp_Imt_EN: need to set to 1
538 * - bit 11: COALESCE_FORCE: need to set to 0
539 * - bit 10: COALESCE_EN: need to set to 1
540 * (but limitations on some on some chipsets)
541 *
542 * On the Intel 5000, 5100, and 7300 chipsets, there is
543 * also: - bit 25:24: COALESCE_MODE, need to set to 0
544 */
545 devid = parent->device;
546 if (devid >= 0x25e2 && devid <= 0x25fa) {
547 /* 5000 P/V/X/Z */
548 if (parent->revision <= 0xb2)
549 bits = 1U << 10;
550 else
551 bits = 7U << 10;
552 mask = (3U << 24) | (7U << 10);
553 } else if (devid >= 0x65e2 && devid <= 0x65fa) {
554 /* 5100 */
555 bits = 1U << 10;
556 mask = (3U << 24) | (7U << 10);
557 } else if (devid >= 0x4021 && devid <= 0x402e) {
558 /* 5400 */
559 bits = 7U << 10;
560 mask = 7U << 10;
561 } else if (devid >= 0x3604 && devid <= 0x360a) {
562 /* 7300 */
563 bits = 7U << 10;
564 mask = (3U << 24) | (7U << 10);
565 } else {
566 /* not one of the chipsets that we know about */
567 return 1;
568 }
569 pci_read_config_dword(parent, 0x48, &val);
570 val &= ~mask;
571 val |= bits;
572 r = pci_write_config_dword(parent, 0x48, val);
573 return 0;
574 }
575
576 /*
577 * BIOS may not set PCIe bus-utilization parameters for best performance.
578 * Check and optionally adjust them to maximize our throughput.
579 */
580 static int qib_pcie_caps;
581 module_param_named(pcie_caps, qib_pcie_caps, int, S_IRUGO);
582 MODULE_PARM_DESC(pcie_caps, "Max PCIe tuning: Payload (0..3), ReadReq (4..7)");
583
qib_tune_pcie_caps(struct qib_devdata * dd)584 static int qib_tune_pcie_caps(struct qib_devdata *dd)
585 {
586 int ret = 1; /* Assume the worst */
587 struct pci_dev *parent;
588 int ppos, epos;
589 u16 pcaps, pctl, ecaps, ectl;
590 int rc_sup, ep_sup;
591 int rc_cur, ep_cur;
592
593 /* Find out supported and configured values for parent (root) */
594 parent = dd->pcidev->bus->self;
595 if (parent->bus->parent) {
596 qib_devinfo(dd->pcidev, "Parent not root\n");
597 goto bail;
598 }
599 ppos = pci_pcie_cap(parent);
600 if (ppos) {
601 pci_read_config_word(parent, ppos + PCI_EXP_DEVCAP, &pcaps);
602 pci_read_config_word(parent, ppos + PCI_EXP_DEVCTL, &pctl);
603 } else
604 goto bail;
605 /* Find out supported and configured values for endpoint (us) */
606 epos = pci_pcie_cap(dd->pcidev);
607 if (epos) {
608 pci_read_config_word(dd->pcidev, epos + PCI_EXP_DEVCAP, &ecaps);
609 pci_read_config_word(dd->pcidev, epos + PCI_EXP_DEVCTL, &ectl);
610 } else
611 goto bail;
612 ret = 0;
613 /* Find max payload supported by root, endpoint */
614 rc_sup = fld2val(pcaps, PCI_EXP_DEVCAP_PAYLOAD);
615 ep_sup = fld2val(ecaps, PCI_EXP_DEVCAP_PAYLOAD);
616 if (rc_sup > ep_sup)
617 rc_sup = ep_sup;
618
619 rc_cur = fld2val(pctl, PCI_EXP_DEVCTL_PAYLOAD);
620 ep_cur = fld2val(ectl, PCI_EXP_DEVCTL_PAYLOAD);
621
622 /* If Supported greater than limit in module param, limit it */
623 if (rc_sup > (qib_pcie_caps & 7))
624 rc_sup = qib_pcie_caps & 7;
625 /* If less than (allowed, supported), bump root payload */
626 if (rc_sup > rc_cur) {
627 rc_cur = rc_sup;
628 pctl = (pctl & ~PCI_EXP_DEVCTL_PAYLOAD) |
629 val2fld(rc_cur, PCI_EXP_DEVCTL_PAYLOAD);
630 pci_write_config_word(parent, ppos + PCI_EXP_DEVCTL, pctl);
631 }
632 /* If less than (allowed, supported), bump endpoint payload */
633 if (rc_sup > ep_cur) {
634 ep_cur = rc_sup;
635 ectl = (ectl & ~PCI_EXP_DEVCTL_PAYLOAD) |
636 val2fld(ep_cur, PCI_EXP_DEVCTL_PAYLOAD);
637 pci_write_config_word(dd->pcidev, epos + PCI_EXP_DEVCTL, ectl);
638 }
639
640 /*
641 * Now the Read Request size.
642 * No field for max supported, but PCIe spec limits it to 4096,
643 * which is code '5' (log2(4096) - 7)
644 */
645 rc_sup = 5;
646 if (rc_sup > ((qib_pcie_caps >> 4) & 7))
647 rc_sup = (qib_pcie_caps >> 4) & 7;
648 rc_cur = fld2val(pctl, PCI_EXP_DEVCTL_READRQ);
649 ep_cur = fld2val(ectl, PCI_EXP_DEVCTL_READRQ);
650
651 if (rc_sup > rc_cur) {
652 rc_cur = rc_sup;
653 pctl = (pctl & ~PCI_EXP_DEVCTL_READRQ) |
654 val2fld(rc_cur, PCI_EXP_DEVCTL_READRQ);
655 pci_write_config_word(parent, ppos + PCI_EXP_DEVCTL, pctl);
656 }
657 if (rc_sup > ep_cur) {
658 ep_cur = rc_sup;
659 ectl = (ectl & ~PCI_EXP_DEVCTL_READRQ) |
660 val2fld(ep_cur, PCI_EXP_DEVCTL_READRQ);
661 pci_write_config_word(dd->pcidev, epos + PCI_EXP_DEVCTL, ectl);
662 }
663 bail:
664 return ret;
665 }
666 /* End of PCIe capability tuning */
667
668 /*
669 * From here through qib_pci_err_handler definition is invoked via
670 * PCI error infrastructure, registered via pci
671 */
672 static pci_ers_result_t
qib_pci_error_detected(struct pci_dev * pdev,pci_channel_state_t state)673 qib_pci_error_detected(struct pci_dev *pdev, pci_channel_state_t state)
674 {
675 struct qib_devdata *dd = pci_get_drvdata(pdev);
676 pci_ers_result_t ret = PCI_ERS_RESULT_RECOVERED;
677
678 switch (state) {
679 case pci_channel_io_normal:
680 qib_devinfo(pdev, "State Normal, ignoring\n");
681 break;
682
683 case pci_channel_io_frozen:
684 qib_devinfo(pdev, "State Frozen, requesting reset\n");
685 pci_disable_device(pdev);
686 ret = PCI_ERS_RESULT_NEED_RESET;
687 break;
688
689 case pci_channel_io_perm_failure:
690 qib_devinfo(pdev, "State Permanent Failure, disabling\n");
691 if (dd) {
692 /* no more register accesses! */
693 dd->flags &= ~QIB_PRESENT;
694 qib_disable_after_error(dd);
695 }
696 /* else early, or other problem */
697 ret = PCI_ERS_RESULT_DISCONNECT;
698 break;
699
700 default: /* shouldn't happen */
701 qib_devinfo(pdev, "QIB PCI errors detected (state %d)\n",
702 state);
703 break;
704 }
705 return ret;
706 }
707
708 static pci_ers_result_t
qib_pci_mmio_enabled(struct pci_dev * pdev)709 qib_pci_mmio_enabled(struct pci_dev *pdev)
710 {
711 u64 words = 0U;
712 struct qib_devdata *dd = pci_get_drvdata(pdev);
713 pci_ers_result_t ret = PCI_ERS_RESULT_RECOVERED;
714
715 if (dd && dd->pport) {
716 words = dd->f_portcntr(dd->pport, QIBPORTCNTR_WORDRCV);
717 if (words == ~0ULL)
718 ret = PCI_ERS_RESULT_NEED_RESET;
719 }
720 qib_devinfo(pdev, "QIB mmio_enabled function called, "
721 "read wordscntr %Lx, returning %d\n", words, ret);
722 return ret;
723 }
724
725 static pci_ers_result_t
qib_pci_slot_reset(struct pci_dev * pdev)726 qib_pci_slot_reset(struct pci_dev *pdev)
727 {
728 qib_devinfo(pdev, "QIB link_reset function called, ignored\n");
729 return PCI_ERS_RESULT_CAN_RECOVER;
730 }
731
732 static pci_ers_result_t
qib_pci_link_reset(struct pci_dev * pdev)733 qib_pci_link_reset(struct pci_dev *pdev)
734 {
735 qib_devinfo(pdev, "QIB link_reset function called, ignored\n");
736 return PCI_ERS_RESULT_CAN_RECOVER;
737 }
738
739 static void
qib_pci_resume(struct pci_dev * pdev)740 qib_pci_resume(struct pci_dev *pdev)
741 {
742 struct qib_devdata *dd = pci_get_drvdata(pdev);
743 qib_devinfo(pdev, "QIB resume function called\n");
744 pci_cleanup_aer_uncorrect_error_status(pdev);
745 /*
746 * Running jobs will fail, since it's asynchronous
747 * unlike sysfs-requested reset. Better than
748 * doing nothing.
749 */
750 qib_init(dd, 1); /* same as re-init after reset */
751 }
752
753 struct pci_error_handlers qib_pci_err_handler = {
754 .error_detected = qib_pci_error_detected,
755 .mmio_enabled = qib_pci_mmio_enabled,
756 .link_reset = qib_pci_link_reset,
757 .slot_reset = qib_pci_slot_reset,
758 .resume = qib_pci_resume,
759 };
760