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1/*
2 * drivers/pci/iov.c
3 *
4 * Copyright (C) 2009 Intel Corporation, Yu Zhao <yu.zhao@intel.com>
5 *
6 * PCI Express I/O Virtualization (IOV) support.
7 * Single Root IOV 1.0
8 * Address Translation Service 1.0
9 */
10
11#include <linux/pci.h>
12#include <linux/slab.h>
13#include <linux/mutex.h>
14#include <linux/export.h>
15#include <linux/string.h>
16#include <linux/delay.h>
17#include <linux/pci-ats.h>
18#include "pci.h"
19
20#define VIRTFN_ID_LEN 16
21
22static inline u8 virtfn_bus(struct pci_dev *dev, int id)
23{
24 return dev->bus->number + ((dev->devfn + dev->sriov->offset +
25 dev->sriov->stride * id) >> 8);
26}
27
28static inline u8 virtfn_devfn(struct pci_dev *dev, int id)
29{
30 return (dev->devfn + dev->sriov->offset +
31 dev->sriov->stride * id) & 0xff;
32}
33
34static struct pci_bus *virtfn_add_bus(struct pci_bus *bus, int busnr)
35{
36 int rc;
37 struct pci_bus *child;
38
39 if (bus->number == busnr)
40 return bus;
41
42 child = pci_find_bus(pci_domain_nr(bus), busnr);
43 if (child)
44 return child;
45
46 child = pci_add_new_bus(bus, NULL, busnr);
47 if (!child)
48 return NULL;
49
50 child->subordinate = busnr;
51 child->dev.parent = bus->bridge;
52 rc = pci_bus_add_child(child);
53 if (rc) {
54 pci_remove_bus(child);
55 return NULL;
56 }
57
58 return child;
59}
60
61static void virtfn_remove_bus(struct pci_bus *bus, int busnr)
62{
63 struct pci_bus *child;
64
65 if (bus->number == busnr)
66 return;
67
68 child = pci_find_bus(pci_domain_nr(bus), busnr);
69 BUG_ON(!child);
70
71 if (list_empty(&child->devices))
72 pci_remove_bus(child);
73}
74
75static int virtfn_add(struct pci_dev *dev, int id, int reset)
76{
77 int i;
78 int rc;
79 u64 size;
80 char buf[VIRTFN_ID_LEN];
81 struct pci_dev *virtfn;
82 struct resource *res;
83 struct pci_sriov *iov = dev->sriov;
84
85 virtfn = alloc_pci_dev();
86 if (!virtfn)
87 return -ENOMEM;
88
89 mutex_lock(&iov->dev->sriov->lock);
90 virtfn->bus = virtfn_add_bus(dev->bus, virtfn_bus(dev, id));
91 if (!virtfn->bus) {
92 kfree(virtfn);
93 mutex_unlock(&iov->dev->sriov->lock);
94 return -ENOMEM;
95 }
96 virtfn->devfn = virtfn_devfn(dev, id);
97 virtfn->vendor = dev->vendor;
98 pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_DID, &virtfn->device);
99 pci_setup_device(virtfn);
100 virtfn->dev.parent = dev->dev.parent;
101
102 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
103 res = dev->resource + PCI_IOV_RESOURCES + i;
104 if (!res->parent)
105 continue;
106 virtfn->resource[i].name = pci_name(virtfn);
107 virtfn->resource[i].flags = res->flags;
108 size = resource_size(res);
109 do_div(size, iov->total);
110 virtfn->resource[i].start = res->start + size * id;
111 virtfn->resource[i].end = virtfn->resource[i].start + size - 1;
112 rc = request_resource(res, &virtfn->resource[i]);
113 BUG_ON(rc);
114 }
115
116 if (reset)
117 __pci_reset_function(virtfn);
118
119 pci_device_add(virtfn, virtfn->bus);
120 mutex_unlock(&iov->dev->sriov->lock);
121
122 virtfn->physfn = pci_dev_get(dev);
123 virtfn->is_virtfn = 1;
124
125 rc = pci_bus_add_device(virtfn);
126 if (rc)
127 goto failed1;
128 sprintf(buf, "virtfn%u", id);
129 rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf);
130 if (rc)
131 goto failed1;
132 rc = sysfs_create_link(&virtfn->dev.kobj, &dev->dev.kobj, "physfn");
133 if (rc)
134 goto failed2;
135
136 kobject_uevent(&virtfn->dev.kobj, KOBJ_CHANGE);
137
138 return 0;
139
140failed2:
141 sysfs_remove_link(&dev->dev.kobj, buf);
142failed1:
143 pci_dev_put(dev);
144 mutex_lock(&iov->dev->sriov->lock);
145 pci_stop_and_remove_bus_device(virtfn);
146 virtfn_remove_bus(dev->bus, virtfn_bus(dev, id));
147 mutex_unlock(&iov->dev->sriov->lock);
148
149 return rc;
150}
151
152static void virtfn_remove(struct pci_dev *dev, int id, int reset)
153{
154 char buf[VIRTFN_ID_LEN];
155 struct pci_bus *bus;
156 struct pci_dev *virtfn;
157 struct pci_sriov *iov = dev->sriov;
158
159 bus = pci_find_bus(pci_domain_nr(dev->bus), virtfn_bus(dev, id));
160 if (!bus)
161 return;
162
163 virtfn = pci_get_slot(bus, virtfn_devfn(dev, id));
164 if (!virtfn)
165 return;
166
167 pci_dev_put(virtfn);
168
169 if (reset) {
170 device_release_driver(&virtfn->dev);
171 __pci_reset_function(virtfn);
172 }
173
174 sprintf(buf, "virtfn%u", id);
175 sysfs_remove_link(&dev->dev.kobj, buf);
176 /*
177 * pci_stop_dev() could have been called for this virtfn already,
178 * so the directory for the virtfn may have been removed before.
179 * Double check to avoid spurious sysfs warnings.
180 */
181 if (virtfn->dev.kobj.sd)
182 sysfs_remove_link(&virtfn->dev.kobj, "physfn");
183
184 mutex_lock(&iov->dev->sriov->lock);
185 pci_stop_and_remove_bus_device(virtfn);
186 virtfn_remove_bus(dev->bus, virtfn_bus(dev, id));
187 mutex_unlock(&iov->dev->sriov->lock);
188
189 pci_dev_put(dev);
190}
191
192static int sriov_migration(struct pci_dev *dev)
193{
194 u16 status;
195 struct pci_sriov *iov = dev->sriov;
196
197 if (!iov->nr_virtfn)
198 return 0;
199
200 if (!(iov->cap & PCI_SRIOV_CAP_VFM))
201 return 0;
202
203 pci_read_config_word(dev, iov->pos + PCI_SRIOV_STATUS, &status);
204 if (!(status & PCI_SRIOV_STATUS_VFM))
205 return 0;
206
207 schedule_work(&iov->mtask);
208
209 return 1;
210}
211
212static void sriov_migration_task(struct work_struct *work)
213{
214 int i;
215 u8 state;
216 u16 status;
217 struct pci_sriov *iov = container_of(work, struct pci_sriov, mtask);
218
219 for (i = iov->initial; i < iov->nr_virtfn; i++) {
220 state = readb(iov->mstate + i);
221 if (state == PCI_SRIOV_VFM_MI) {
222 writeb(PCI_SRIOV_VFM_AV, iov->mstate + i);
223 state = readb(iov->mstate + i);
224 if (state == PCI_SRIOV_VFM_AV)
225 virtfn_add(iov->self, i, 1);
226 } else if (state == PCI_SRIOV_VFM_MO) {
227 virtfn_remove(iov->self, i, 1);
228 writeb(PCI_SRIOV_VFM_UA, iov->mstate + i);
229 state = readb(iov->mstate + i);
230 if (state == PCI_SRIOV_VFM_AV)
231 virtfn_add(iov->self, i, 0);
232 }
233 }
234
235 pci_read_config_word(iov->self, iov->pos + PCI_SRIOV_STATUS, &status);
236 status &= ~PCI_SRIOV_STATUS_VFM;
237 pci_write_config_word(iov->self, iov->pos + PCI_SRIOV_STATUS, status);
238}
239
240static int sriov_enable_migration(struct pci_dev *dev, int nr_virtfn)
241{
242 int bir;
243 u32 table;
244 resource_size_t pa;
245 struct pci_sriov *iov = dev->sriov;
246
247 if (nr_virtfn <= iov->initial)
248 return 0;
249
250 pci_read_config_dword(dev, iov->pos + PCI_SRIOV_VFM, &table);
251 bir = PCI_SRIOV_VFM_BIR(table);
252 if (bir > PCI_STD_RESOURCE_END)
253 return -EIO;
254
255 table = PCI_SRIOV_VFM_OFFSET(table);
256 if (table + nr_virtfn > pci_resource_len(dev, bir))
257 return -EIO;
258
259 pa = pci_resource_start(dev, bir) + table;
260 iov->mstate = ioremap(pa, nr_virtfn);
261 if (!iov->mstate)
262 return -ENOMEM;
263
264 INIT_WORK(&iov->mtask, sriov_migration_task);
265
266 iov->ctrl |= PCI_SRIOV_CTRL_VFM | PCI_SRIOV_CTRL_INTR;
267 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
268
269 return 0;
270}
271
272static void sriov_disable_migration(struct pci_dev *dev)
273{
274 struct pci_sriov *iov = dev->sriov;
275
276 iov->ctrl &= ~(PCI_SRIOV_CTRL_VFM | PCI_SRIOV_CTRL_INTR);
277 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
278
279 cancel_work_sync(&iov->mtask);
280 iounmap(iov->mstate);
281}
282
283static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
284{
285 int rc;
286 int i, j;
287 int nres;
288 u16 offset, stride, initial;
289 struct resource *res;
290 struct pci_dev *pdev;
291 struct pci_sriov *iov = dev->sriov;
292 int bars = 0;
293
294 if (!nr_virtfn)
295 return 0;
296
297 if (iov->nr_virtfn)
298 return -EINVAL;
299
300 pci_read_config_word(dev, iov->pos + PCI_SRIOV_INITIAL_VF, &initial);
301 if (initial > iov->total ||
302 (!(iov->cap & PCI_SRIOV_CAP_VFM) && (initial != iov->total)))
303 return -EIO;
304
305 if (nr_virtfn < 0 || nr_virtfn > iov->total ||
306 (!(iov->cap & PCI_SRIOV_CAP_VFM) && (nr_virtfn > initial)))
307 return -EINVAL;
308
309 pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, nr_virtfn);
310 pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_OFFSET, &offset);
311 pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_STRIDE, &stride);
312 if (!offset || (nr_virtfn > 1 && !stride))
313 return -EIO;
314
315 nres = 0;
316 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
317 bars |= (1 << (i + PCI_IOV_RESOURCES));
318 res = dev->resource + PCI_IOV_RESOURCES + i;
319 if (res->parent)
320 nres++;
321 }
322 if (nres != iov->nres) {
323 dev_err(&dev->dev, "not enough MMIO resources for SR-IOV\n");
324 return -ENOMEM;
325 }
326
327 iov->offset = offset;
328 iov->stride = stride;
329
330 if (virtfn_bus(dev, nr_virtfn - 1) > dev->bus->subordinate) {
331 dev_err(&dev->dev, "SR-IOV: bus number out of range\n");
332 return -ENOMEM;
333 }
334
335 if (pci_enable_resources(dev, bars)) {
336 dev_err(&dev->dev, "SR-IOV: IOV BARS not allocated\n");
337 return -ENOMEM;
338 }
339
340 if (iov->link != dev->devfn) {
341 pdev = pci_get_slot(dev->bus, iov->link);
342 if (!pdev)
343 return -ENODEV;
344
345 pci_dev_put(pdev);
346
347 if (!pdev->is_physfn)
348 return -ENODEV;
349
350 rc = sysfs_create_link(&dev->dev.kobj,
351 &pdev->dev.kobj, "dep_link");
352 if (rc)
353 return rc;
354 }
355
356 iov->ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE;
357 pci_cfg_access_lock(dev);
358 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
359 msleep(100);
360 pci_cfg_access_unlock(dev);
361
362 iov->initial = initial;
363 if (nr_virtfn < initial)
364 initial = nr_virtfn;
365
366 for (i = 0; i < initial; i++) {
367 rc = virtfn_add(dev, i, 0);
368 if (rc)
369 goto failed;
370 }
371
372 if (iov->cap & PCI_SRIOV_CAP_VFM) {
373 rc = sriov_enable_migration(dev, nr_virtfn);
374 if (rc)
375 goto failed;
376 }
377
378 kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE);
379 iov->nr_virtfn = nr_virtfn;
380
381 return 0;
382
383failed:
384 for (j = 0; j < i; j++)
385 virtfn_remove(dev, j, 0);
386
387 iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
388 pci_cfg_access_lock(dev);
389 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
390 ssleep(1);
391 pci_cfg_access_unlock(dev);
392
393 if (iov->link != dev->devfn)
394 sysfs_remove_link(&dev->dev.kobj, "dep_link");
395
396 return rc;
397}
398
399static void sriov_disable(struct pci_dev *dev)
400{
401 int i;
402 struct pci_sriov *iov = dev->sriov;
403
404 if (!iov->nr_virtfn)
405 return;
406
407 if (iov->cap & PCI_SRIOV_CAP_VFM)
408 sriov_disable_migration(dev);
409
410 for (i = 0; i < iov->nr_virtfn; i++)
411 virtfn_remove(dev, i, 0);
412
413 iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
414 pci_cfg_access_lock(dev);
415 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
416 ssleep(1);
417 pci_cfg_access_unlock(dev);
418
419 if (iov->link != dev->devfn)
420 sysfs_remove_link(&dev->dev.kobj, "dep_link");
421
422 iov->nr_virtfn = 0;
423}
424
425static int sriov_init(struct pci_dev *dev, int pos)
426{
427 int i;
428 int rc;
429 int nres;
430 u32 pgsz;
431 u16 ctrl, total, offset, stride;
432 struct pci_sriov *iov;
433 struct resource *res;
434 struct pci_dev *pdev;
435
436 if (dev->pcie_type != PCI_EXP_TYPE_RC_END &&
437 dev->pcie_type != PCI_EXP_TYPE_ENDPOINT)
438 return -ENODEV;
439
440 pci_read_config_word(dev, pos + PCI_SRIOV_CTRL, &ctrl);
441 if (ctrl & PCI_SRIOV_CTRL_VFE) {
442 pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, 0);
443 ssleep(1);
444 }
445
446 pci_read_config_word(dev, pos + PCI_SRIOV_TOTAL_VF, &total);
447 if (!total)
448 return 0;
449
450 ctrl = 0;
451 list_for_each_entry(pdev, &dev->bus->devices, bus_list)
452 if (pdev->is_physfn)
453 goto found;
454
455 pdev = NULL;
456 if (pci_ari_enabled(dev->bus))
457 ctrl |= PCI_SRIOV_CTRL_ARI;
458
459found:
460 pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, ctrl);
461 pci_read_config_word(dev, pos + PCI_SRIOV_VF_OFFSET, &offset);
462 pci_read_config_word(dev, pos + PCI_SRIOV_VF_STRIDE, &stride);
463 if (!offset || (total > 1 && !stride))
464 return -EIO;
465
466 pci_read_config_dword(dev, pos + PCI_SRIOV_SUP_PGSIZE, &pgsz);
467 i = PAGE_SHIFT > 12 ? PAGE_SHIFT - 12 : 0;
468 pgsz &= ~((1 << i) - 1);
469 if (!pgsz)
470 return -EIO;
471
472 pgsz &= ~(pgsz - 1);
473 pci_write_config_dword(dev, pos + PCI_SRIOV_SYS_PGSIZE, pgsz);
474
475 nres = 0;
476 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
477 res = dev->resource + PCI_IOV_RESOURCES + i;
478 i += __pci_read_base(dev, pci_bar_unknown, res,
479 pos + PCI_SRIOV_BAR + i * 4);
480 if (!res->flags)
481 continue;
482 if (resource_size(res) & (PAGE_SIZE - 1)) {
483 rc = -EIO;
484 goto failed;
485 }
486 res->end = res->start + resource_size(res) * total - 1;
487 nres++;
488 }
489
490 iov = kzalloc(sizeof(*iov), GFP_KERNEL);
491 if (!iov) {
492 rc = -ENOMEM;
493 goto failed;
494 }
495
496 iov->pos = pos;
497 iov->nres = nres;
498 iov->ctrl = ctrl;
499 iov->total = total;
500 iov->offset = offset;
501 iov->stride = stride;
502 iov->pgsz = pgsz;
503 iov->self = dev;
504 pci_read_config_dword(dev, pos + PCI_SRIOV_CAP, &iov->cap);
505 pci_read_config_byte(dev, pos + PCI_SRIOV_FUNC_LINK, &iov->link);
506 if (dev->pcie_type == PCI_EXP_TYPE_RC_END)
507 iov->link = PCI_DEVFN(PCI_SLOT(dev->devfn), iov->link);
508
509 if (pdev)
510 iov->dev = pci_dev_get(pdev);
511 else
512 iov->dev = dev;
513
514 mutex_init(&iov->lock);
515
516 dev->sriov = iov;
517 dev->is_physfn = 1;
518
519 return 0;
520
521failed:
522 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
523 res = dev->resource + PCI_IOV_RESOURCES + i;
524 res->flags = 0;
525 }
526
527 return rc;
528}
529
530static void sriov_release(struct pci_dev *dev)
531{
532 BUG_ON(dev->sriov->nr_virtfn);
533
534 if (dev != dev->sriov->dev)
535 pci_dev_put(dev->sriov->dev);
536
537 mutex_destroy(&dev->sriov->lock);
538
539 kfree(dev->sriov);
540 dev->sriov = NULL;
541}
542
543static void sriov_restore_state(struct pci_dev *dev)
544{
545 int i;
546 u16 ctrl;
547 struct pci_sriov *iov = dev->sriov;
548
549 pci_read_config_word(dev, iov->pos + PCI_SRIOV_CTRL, &ctrl);
550 if (ctrl & PCI_SRIOV_CTRL_VFE)
551 return;
552
553 for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++)
554 pci_update_resource(dev, i);
555
556 pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz);
557 pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, iov->nr_virtfn);
558 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
559 if (iov->ctrl & PCI_SRIOV_CTRL_VFE)
560 msleep(100);
561}
562
563/**
564 * pci_iov_init - initialize the IOV capability
565 * @dev: the PCI device
566 *
567 * Returns 0 on success, or negative on failure.
568 */
569int pci_iov_init(struct pci_dev *dev)
570{
571 int pos;
572
573 if (!pci_is_pcie(dev))
574 return -ENODEV;
575
576 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV);
577 if (pos)
578 return sriov_init(dev, pos);
579
580 return -ENODEV;
581}
582
583/**
584 * pci_iov_release - release resources used by the IOV capability
585 * @dev: the PCI device
586 */
587void pci_iov_release(struct pci_dev *dev)
588{
589 if (dev->is_physfn)
590 sriov_release(dev);
591}
592
593/**
594 * pci_iov_resource_bar - get position of the SR-IOV BAR
595 * @dev: the PCI device
596 * @resno: the resource number
597 * @type: the BAR type to be filled in
598 *
599 * Returns position of the BAR encapsulated in the SR-IOV capability.
600 */
601int pci_iov_resource_bar(struct pci_dev *dev, int resno,
602 enum pci_bar_type *type)
603{
604 if (resno < PCI_IOV_RESOURCES || resno > PCI_IOV_RESOURCE_END)
605 return 0;
606
607 BUG_ON(!dev->is_physfn);
608
609 *type = pci_bar_unknown;
610
611 return dev->sriov->pos + PCI_SRIOV_BAR +
612 4 * (resno - PCI_IOV_RESOURCES);
613}
614
615/**
616 * pci_sriov_resource_alignment - get resource alignment for VF BAR
617 * @dev: the PCI device
618 * @resno: the resource number
619 *
620 * Returns the alignment of the VF BAR found in the SR-IOV capability.
621 * This is not the same as the resource size which is defined as
622 * the VF BAR size multiplied by the number of VFs. The alignment
623 * is just the VF BAR size.
624 */
625resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno)
626{
627 struct resource tmp;
628 enum pci_bar_type type;
629 int reg = pci_iov_resource_bar(dev, resno, &type);
630
631 if (!reg)
632 return 0;
633
634 __pci_read_base(dev, type, &tmp, reg);
635 return resource_alignment(&tmp);
636}
637
638/**
639 * pci_restore_iov_state - restore the state of the IOV capability
640 * @dev: the PCI device
641 */
642void pci_restore_iov_state(struct pci_dev *dev)
643{
644 if (dev->is_physfn)
645 sriov_restore_state(dev);
646}
647
648/**
649 * pci_iov_bus_range - find bus range used by Virtual Function
650 * @bus: the PCI bus
651 *
652 * Returns max number of buses (exclude current one) used by Virtual
653 * Functions.
654 */
655int pci_iov_bus_range(struct pci_bus *bus)
656{
657 int max = 0;
658 u8 busnr;
659 struct pci_dev *dev;
660
661 list_for_each_entry(dev, &bus->devices, bus_list) {
662 if (!dev->is_physfn)
663 continue;
664 busnr = virtfn_bus(dev, dev->sriov->total - 1);
665 if (busnr > max)
666 max = busnr;
667 }
668
669 return max ? max - bus->number : 0;
670}
671
672/**
673 * pci_enable_sriov - enable the SR-IOV capability
674 * @dev: the PCI device
675 * @nr_virtfn: number of virtual functions to enable
676 *
677 * Returns 0 on success, or negative on failure.
678 */
679int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
680{
681 might_sleep();
682
683 if (!dev->is_physfn)
684 return -ENODEV;
685
686 return sriov_enable(dev, nr_virtfn);
687}
688EXPORT_SYMBOL_GPL(pci_enable_sriov);
689
690/**
691 * pci_disable_sriov - disable the SR-IOV capability
692 * @dev: the PCI device
693 */
694void pci_disable_sriov(struct pci_dev *dev)
695{
696 might_sleep();
697
698 if (!dev->is_physfn)
699 return;
700
701 sriov_disable(dev);
702}
703EXPORT_SYMBOL_GPL(pci_disable_sriov);
704
705/**
706 * pci_sriov_migration - notify SR-IOV core of Virtual Function Migration
707 * @dev: the PCI device
708 *
709 * Returns IRQ_HANDLED if the IRQ is handled, or IRQ_NONE if not.
710 *
711 * Physical Function driver is responsible to register IRQ handler using
712 * VF Migration Interrupt Message Number, and call this function when the
713 * interrupt is generated by the hardware.
714 */
715irqreturn_t pci_sriov_migration(struct pci_dev *dev)
716{
717 if (!dev->is_physfn)
718 return IRQ_NONE;
719
720 return sriov_migration(dev) ? IRQ_HANDLED : IRQ_NONE;
721}
722EXPORT_SYMBOL_GPL(pci_sriov_migration);
723
724/**
725 * pci_num_vf - return number of VFs associated with a PF device_release_driver
726 * @dev: the PCI device
727 *
728 * Returns number of VFs, or 0 if SR-IOV is not enabled.
729 */
730int pci_num_vf(struct pci_dev *dev)
731{
732 if (!dev || !dev->is_physfn)
733 return 0;
734 else
735 return dev->sriov->nr_virtfn;
736}
737EXPORT_SYMBOL_GPL(pci_num_vf);
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * PCI Express I/O Virtualization (IOV) support
4 * Single Root IOV 1.0
5 * Address Translation Service 1.0
6 *
7 * Copyright (C) 2009 Intel Corporation, Yu Zhao <yu.zhao@intel.com>
8 */
9
10#include <linux/pci.h>
11#include <linux/slab.h>
12#include <linux/mutex.h>
13#include <linux/export.h>
14#include <linux/string.h>
15#include <linux/delay.h>
16#include <linux/pci-ats.h>
17#include "pci.h"
18
19#define VIRTFN_ID_LEN 16
20
21int pci_iov_virtfn_bus(struct pci_dev *dev, int vf_id)
22{
23 if (!dev->is_physfn)
24 return -EINVAL;
25 return dev->bus->number + ((dev->devfn + dev->sriov->offset +
26 dev->sriov->stride * vf_id) >> 8);
27}
28
29int pci_iov_virtfn_devfn(struct pci_dev *dev, int vf_id)
30{
31 if (!dev->is_physfn)
32 return -EINVAL;
33 return (dev->devfn + dev->sriov->offset +
34 dev->sriov->stride * vf_id) & 0xff;
35}
36
37/*
38 * Per SR-IOV spec sec 3.3.10 and 3.3.11, First VF Offset and VF Stride may
39 * change when NumVFs changes.
40 *
41 * Update iov->offset and iov->stride when NumVFs is written.
42 */
43static inline void pci_iov_set_numvfs(struct pci_dev *dev, int nr_virtfn)
44{
45 struct pci_sriov *iov = dev->sriov;
46
47 pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, nr_virtfn);
48 pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_OFFSET, &iov->offset);
49 pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_STRIDE, &iov->stride);
50}
51
52/*
53 * The PF consumes one bus number. NumVFs, First VF Offset, and VF Stride
54 * determine how many additional bus numbers will be consumed by VFs.
55 *
56 * Iterate over all valid NumVFs, validate offset and stride, and calculate
57 * the maximum number of bus numbers that could ever be required.
58 */
59static int compute_max_vf_buses(struct pci_dev *dev)
60{
61 struct pci_sriov *iov = dev->sriov;
62 int nr_virtfn, busnr, rc = 0;
63
64 for (nr_virtfn = iov->total_VFs; nr_virtfn; nr_virtfn--) {
65 pci_iov_set_numvfs(dev, nr_virtfn);
66 if (!iov->offset || (nr_virtfn > 1 && !iov->stride)) {
67 rc = -EIO;
68 goto out;
69 }
70
71 busnr = pci_iov_virtfn_bus(dev, nr_virtfn - 1);
72 if (busnr > iov->max_VF_buses)
73 iov->max_VF_buses = busnr;
74 }
75
76out:
77 pci_iov_set_numvfs(dev, 0);
78 return rc;
79}
80
81static struct pci_bus *virtfn_add_bus(struct pci_bus *bus, int busnr)
82{
83 struct pci_bus *child;
84
85 if (bus->number == busnr)
86 return bus;
87
88 child = pci_find_bus(pci_domain_nr(bus), busnr);
89 if (child)
90 return child;
91
92 child = pci_add_new_bus(bus, NULL, busnr);
93 if (!child)
94 return NULL;
95
96 pci_bus_insert_busn_res(child, busnr, busnr);
97
98 return child;
99}
100
101static void virtfn_remove_bus(struct pci_bus *physbus, struct pci_bus *virtbus)
102{
103 if (physbus != virtbus && list_empty(&virtbus->devices))
104 pci_remove_bus(virtbus);
105}
106
107resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno)
108{
109 if (!dev->is_physfn)
110 return 0;
111
112 return dev->sriov->barsz[resno - PCI_IOV_RESOURCES];
113}
114
115static void pci_read_vf_config_common(struct pci_dev *virtfn)
116{
117 struct pci_dev *physfn = virtfn->physfn;
118
119 /*
120 * Some config registers are the same across all associated VFs.
121 * Read them once from VF0 so we can skip reading them from the
122 * other VFs.
123 *
124 * PCIe r4.0, sec 9.3.4.1, technically doesn't require all VFs to
125 * have the same Revision ID and Subsystem ID, but we assume they
126 * do.
127 */
128 pci_read_config_dword(virtfn, PCI_CLASS_REVISION,
129 &physfn->sriov->class);
130 pci_read_config_byte(virtfn, PCI_HEADER_TYPE,
131 &physfn->sriov->hdr_type);
132 pci_read_config_word(virtfn, PCI_SUBSYSTEM_VENDOR_ID,
133 &physfn->sriov->subsystem_vendor);
134 pci_read_config_word(virtfn, PCI_SUBSYSTEM_ID,
135 &physfn->sriov->subsystem_device);
136}
137
138int pci_iov_add_virtfn(struct pci_dev *dev, int id)
139{
140 int i;
141 int rc = -ENOMEM;
142 u64 size;
143 char buf[VIRTFN_ID_LEN];
144 struct pci_dev *virtfn;
145 struct resource *res;
146 struct pci_sriov *iov = dev->sriov;
147 struct pci_bus *bus;
148
149 bus = virtfn_add_bus(dev->bus, pci_iov_virtfn_bus(dev, id));
150 if (!bus)
151 goto failed;
152
153 virtfn = pci_alloc_dev(bus);
154 if (!virtfn)
155 goto failed0;
156
157 virtfn->devfn = pci_iov_virtfn_devfn(dev, id);
158 virtfn->vendor = dev->vendor;
159 virtfn->device = iov->vf_device;
160 virtfn->is_virtfn = 1;
161 virtfn->physfn = pci_dev_get(dev);
162
163 if (id == 0)
164 pci_read_vf_config_common(virtfn);
165
166 rc = pci_setup_device(virtfn);
167 if (rc)
168 goto failed1;
169
170 virtfn->dev.parent = dev->dev.parent;
171 virtfn->multifunction = 0;
172
173 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
174 res = &dev->resource[i + PCI_IOV_RESOURCES];
175 if (!res->parent)
176 continue;
177 virtfn->resource[i].name = pci_name(virtfn);
178 virtfn->resource[i].flags = res->flags;
179 size = pci_iov_resource_size(dev, i + PCI_IOV_RESOURCES);
180 virtfn->resource[i].start = res->start + size * id;
181 virtfn->resource[i].end = virtfn->resource[i].start + size - 1;
182 rc = request_resource(res, &virtfn->resource[i]);
183 BUG_ON(rc);
184 }
185
186 pci_device_add(virtfn, virtfn->bus);
187
188 sprintf(buf, "virtfn%u", id);
189 rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf);
190 if (rc)
191 goto failed2;
192 rc = sysfs_create_link(&virtfn->dev.kobj, &dev->dev.kobj, "physfn");
193 if (rc)
194 goto failed3;
195
196 kobject_uevent(&virtfn->dev.kobj, KOBJ_CHANGE);
197
198 pci_bus_add_device(virtfn);
199
200 return 0;
201
202failed3:
203 sysfs_remove_link(&dev->dev.kobj, buf);
204failed2:
205 pci_stop_and_remove_bus_device(virtfn);
206failed1:
207 pci_dev_put(dev);
208failed0:
209 virtfn_remove_bus(dev->bus, bus);
210failed:
211
212 return rc;
213}
214
215void pci_iov_remove_virtfn(struct pci_dev *dev, int id)
216{
217 char buf[VIRTFN_ID_LEN];
218 struct pci_dev *virtfn;
219
220 virtfn = pci_get_domain_bus_and_slot(pci_domain_nr(dev->bus),
221 pci_iov_virtfn_bus(dev, id),
222 pci_iov_virtfn_devfn(dev, id));
223 if (!virtfn)
224 return;
225
226 sprintf(buf, "virtfn%u", id);
227 sysfs_remove_link(&dev->dev.kobj, buf);
228 /*
229 * pci_stop_dev() could have been called for this virtfn already,
230 * so the directory for the virtfn may have been removed before.
231 * Double check to avoid spurious sysfs warnings.
232 */
233 if (virtfn->dev.kobj.sd)
234 sysfs_remove_link(&virtfn->dev.kobj, "physfn");
235
236 pci_stop_and_remove_bus_device(virtfn);
237 virtfn_remove_bus(dev->bus, virtfn->bus);
238
239 /* balance pci_get_domain_bus_and_slot() */
240 pci_dev_put(virtfn);
241 pci_dev_put(dev);
242}
243
244int __weak pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
245{
246 return 0;
247}
248
249int __weak pcibios_sriov_disable(struct pci_dev *pdev)
250{
251 return 0;
252}
253
254static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
255{
256 int rc;
257 int i;
258 int nres;
259 u16 initial;
260 struct resource *res;
261 struct pci_dev *pdev;
262 struct pci_sriov *iov = dev->sriov;
263 int bars = 0;
264 int bus;
265
266 if (!nr_virtfn)
267 return 0;
268
269 if (iov->num_VFs)
270 return -EINVAL;
271
272 pci_read_config_word(dev, iov->pos + PCI_SRIOV_INITIAL_VF, &initial);
273 if (initial > iov->total_VFs ||
274 (!(iov->cap & PCI_SRIOV_CAP_VFM) && (initial != iov->total_VFs)))
275 return -EIO;
276
277 if (nr_virtfn < 0 || nr_virtfn > iov->total_VFs ||
278 (!(iov->cap & PCI_SRIOV_CAP_VFM) && (nr_virtfn > initial)))
279 return -EINVAL;
280
281 nres = 0;
282 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
283 bars |= (1 << (i + PCI_IOV_RESOURCES));
284 res = &dev->resource[i + PCI_IOV_RESOURCES];
285 if (res->parent)
286 nres++;
287 }
288 if (nres != iov->nres) {
289 pci_err(dev, "not enough MMIO resources for SR-IOV\n");
290 return -ENOMEM;
291 }
292
293 bus = pci_iov_virtfn_bus(dev, nr_virtfn - 1);
294 if (bus > dev->bus->busn_res.end) {
295 pci_err(dev, "can't enable %d VFs (bus %02x out of range of %pR)\n",
296 nr_virtfn, bus, &dev->bus->busn_res);
297 return -ENOMEM;
298 }
299
300 if (pci_enable_resources(dev, bars)) {
301 pci_err(dev, "SR-IOV: IOV BARS not allocated\n");
302 return -ENOMEM;
303 }
304
305 if (iov->link != dev->devfn) {
306 pdev = pci_get_slot(dev->bus, iov->link);
307 if (!pdev)
308 return -ENODEV;
309
310 if (!pdev->is_physfn) {
311 pci_dev_put(pdev);
312 return -ENOSYS;
313 }
314
315 rc = sysfs_create_link(&dev->dev.kobj,
316 &pdev->dev.kobj, "dep_link");
317 pci_dev_put(pdev);
318 if (rc)
319 return rc;
320 }
321
322 iov->initial_VFs = initial;
323 if (nr_virtfn < initial)
324 initial = nr_virtfn;
325
326 rc = pcibios_sriov_enable(dev, initial);
327 if (rc) {
328 pci_err(dev, "failure %d from pcibios_sriov_enable()\n", rc);
329 goto err_pcibios;
330 }
331
332 pci_iov_set_numvfs(dev, nr_virtfn);
333 iov->ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE;
334 pci_cfg_access_lock(dev);
335 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
336 msleep(100);
337 pci_cfg_access_unlock(dev);
338
339 for (i = 0; i < initial; i++) {
340 rc = pci_iov_add_virtfn(dev, i);
341 if (rc)
342 goto failed;
343 }
344
345 kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE);
346 iov->num_VFs = nr_virtfn;
347
348 return 0;
349
350failed:
351 while (i--)
352 pci_iov_remove_virtfn(dev, i);
353
354err_pcibios:
355 iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
356 pci_cfg_access_lock(dev);
357 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
358 ssleep(1);
359 pci_cfg_access_unlock(dev);
360
361 pcibios_sriov_disable(dev);
362
363 if (iov->link != dev->devfn)
364 sysfs_remove_link(&dev->dev.kobj, "dep_link");
365
366 pci_iov_set_numvfs(dev, 0);
367 return rc;
368}
369
370static void sriov_disable(struct pci_dev *dev)
371{
372 int i;
373 struct pci_sriov *iov = dev->sriov;
374
375 if (!iov->num_VFs)
376 return;
377
378 for (i = 0; i < iov->num_VFs; i++)
379 pci_iov_remove_virtfn(dev, i);
380
381 iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
382 pci_cfg_access_lock(dev);
383 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
384 ssleep(1);
385 pci_cfg_access_unlock(dev);
386
387 pcibios_sriov_disable(dev);
388
389 if (iov->link != dev->devfn)
390 sysfs_remove_link(&dev->dev.kobj, "dep_link");
391
392 iov->num_VFs = 0;
393 pci_iov_set_numvfs(dev, 0);
394}
395
396static int sriov_init(struct pci_dev *dev, int pos)
397{
398 int i, bar64;
399 int rc;
400 int nres;
401 u32 pgsz;
402 u16 ctrl, total;
403 struct pci_sriov *iov;
404 struct resource *res;
405 struct pci_dev *pdev;
406
407 pci_read_config_word(dev, pos + PCI_SRIOV_CTRL, &ctrl);
408 if (ctrl & PCI_SRIOV_CTRL_VFE) {
409 pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, 0);
410 ssleep(1);
411 }
412
413 ctrl = 0;
414 list_for_each_entry(pdev, &dev->bus->devices, bus_list)
415 if (pdev->is_physfn)
416 goto found;
417
418 pdev = NULL;
419 if (pci_ari_enabled(dev->bus))
420 ctrl |= PCI_SRIOV_CTRL_ARI;
421
422found:
423 pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, ctrl);
424
425 pci_read_config_word(dev, pos + PCI_SRIOV_TOTAL_VF, &total);
426 if (!total)
427 return 0;
428
429 pci_read_config_dword(dev, pos + PCI_SRIOV_SUP_PGSIZE, &pgsz);
430 i = PAGE_SHIFT > 12 ? PAGE_SHIFT - 12 : 0;
431 pgsz &= ~((1 << i) - 1);
432 if (!pgsz)
433 return -EIO;
434
435 pgsz &= ~(pgsz - 1);
436 pci_write_config_dword(dev, pos + PCI_SRIOV_SYS_PGSIZE, pgsz);
437
438 iov = kzalloc(sizeof(*iov), GFP_KERNEL);
439 if (!iov)
440 return -ENOMEM;
441
442 nres = 0;
443 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
444 res = &dev->resource[i + PCI_IOV_RESOURCES];
445 /*
446 * If it is already FIXED, don't change it, something
447 * (perhaps EA or header fixups) wants it this way.
448 */
449 if (res->flags & IORESOURCE_PCI_FIXED)
450 bar64 = (res->flags & IORESOURCE_MEM_64) ? 1 : 0;
451 else
452 bar64 = __pci_read_base(dev, pci_bar_unknown, res,
453 pos + PCI_SRIOV_BAR + i * 4);
454 if (!res->flags)
455 continue;
456 if (resource_size(res) & (PAGE_SIZE - 1)) {
457 rc = -EIO;
458 goto failed;
459 }
460 iov->barsz[i] = resource_size(res);
461 res->end = res->start + resource_size(res) * total - 1;
462 pci_info(dev, "VF(n) BAR%d space: %pR (contains BAR%d for %d VFs)\n",
463 i, res, i, total);
464 i += bar64;
465 nres++;
466 }
467
468 iov->pos = pos;
469 iov->nres = nres;
470 iov->ctrl = ctrl;
471 iov->total_VFs = total;
472 pci_read_config_word(dev, pos + PCI_SRIOV_VF_DID, &iov->vf_device);
473 iov->pgsz = pgsz;
474 iov->self = dev;
475 iov->drivers_autoprobe = true;
476 pci_read_config_dword(dev, pos + PCI_SRIOV_CAP, &iov->cap);
477 pci_read_config_byte(dev, pos + PCI_SRIOV_FUNC_LINK, &iov->link);
478 if (pci_pcie_type(dev) == PCI_EXP_TYPE_RC_END)
479 iov->link = PCI_DEVFN(PCI_SLOT(dev->devfn), iov->link);
480
481 if (pdev)
482 iov->dev = pci_dev_get(pdev);
483 else
484 iov->dev = dev;
485
486 dev->sriov = iov;
487 dev->is_physfn = 1;
488 rc = compute_max_vf_buses(dev);
489 if (rc)
490 goto fail_max_buses;
491
492 return 0;
493
494fail_max_buses:
495 dev->sriov = NULL;
496 dev->is_physfn = 0;
497failed:
498 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
499 res = &dev->resource[i + PCI_IOV_RESOURCES];
500 res->flags = 0;
501 }
502
503 kfree(iov);
504 return rc;
505}
506
507static void sriov_release(struct pci_dev *dev)
508{
509 BUG_ON(dev->sriov->num_VFs);
510
511 if (dev != dev->sriov->dev)
512 pci_dev_put(dev->sriov->dev);
513
514 kfree(dev->sriov);
515 dev->sriov = NULL;
516}
517
518static void sriov_restore_state(struct pci_dev *dev)
519{
520 int i;
521 u16 ctrl;
522 struct pci_sriov *iov = dev->sriov;
523
524 pci_read_config_word(dev, iov->pos + PCI_SRIOV_CTRL, &ctrl);
525 if (ctrl & PCI_SRIOV_CTRL_VFE)
526 return;
527
528 /*
529 * Restore PCI_SRIOV_CTRL_ARI before pci_iov_set_numvfs() because
530 * it reads offset & stride, which depend on PCI_SRIOV_CTRL_ARI.
531 */
532 ctrl &= ~PCI_SRIOV_CTRL_ARI;
533 ctrl |= iov->ctrl & PCI_SRIOV_CTRL_ARI;
534 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, ctrl);
535
536 for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++)
537 pci_update_resource(dev, i);
538
539 pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz);
540 pci_iov_set_numvfs(dev, iov->num_VFs);
541 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
542 if (iov->ctrl & PCI_SRIOV_CTRL_VFE)
543 msleep(100);
544}
545
546/**
547 * pci_iov_init - initialize the IOV capability
548 * @dev: the PCI device
549 *
550 * Returns 0 on success, or negative on failure.
551 */
552int pci_iov_init(struct pci_dev *dev)
553{
554 int pos;
555
556 if (!pci_is_pcie(dev))
557 return -ENODEV;
558
559 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV);
560 if (pos)
561 return sriov_init(dev, pos);
562
563 return -ENODEV;
564}
565
566/**
567 * pci_iov_release - release resources used by the IOV capability
568 * @dev: the PCI device
569 */
570void pci_iov_release(struct pci_dev *dev)
571{
572 if (dev->is_physfn)
573 sriov_release(dev);
574}
575
576/**
577 * pci_iov_update_resource - update a VF BAR
578 * @dev: the PCI device
579 * @resno: the resource number
580 *
581 * Update a VF BAR in the SR-IOV capability of a PF.
582 */
583void pci_iov_update_resource(struct pci_dev *dev, int resno)
584{
585 struct pci_sriov *iov = dev->is_physfn ? dev->sriov : NULL;
586 struct resource *res = dev->resource + resno;
587 int vf_bar = resno - PCI_IOV_RESOURCES;
588 struct pci_bus_region region;
589 u16 cmd;
590 u32 new;
591 int reg;
592
593 /*
594 * The generic pci_restore_bars() path calls this for all devices,
595 * including VFs and non-SR-IOV devices. If this is not a PF, we
596 * have nothing to do.
597 */
598 if (!iov)
599 return;
600
601 pci_read_config_word(dev, iov->pos + PCI_SRIOV_CTRL, &cmd);
602 if ((cmd & PCI_SRIOV_CTRL_VFE) && (cmd & PCI_SRIOV_CTRL_MSE)) {
603 dev_WARN(&dev->dev, "can't update enabled VF BAR%d %pR\n",
604 vf_bar, res);
605 return;
606 }
607
608 /*
609 * Ignore unimplemented BARs, unused resource slots for 64-bit
610 * BARs, and non-movable resources, e.g., those described via
611 * Enhanced Allocation.
612 */
613 if (!res->flags)
614 return;
615
616 if (res->flags & IORESOURCE_UNSET)
617 return;
618
619 if (res->flags & IORESOURCE_PCI_FIXED)
620 return;
621
622 pcibios_resource_to_bus(dev->bus, ®ion, res);
623 new = region.start;
624 new |= res->flags & ~PCI_BASE_ADDRESS_MEM_MASK;
625
626 reg = iov->pos + PCI_SRIOV_BAR + 4 * vf_bar;
627 pci_write_config_dword(dev, reg, new);
628 if (res->flags & IORESOURCE_MEM_64) {
629 new = region.start >> 16 >> 16;
630 pci_write_config_dword(dev, reg + 4, new);
631 }
632}
633
634resource_size_t __weak pcibios_iov_resource_alignment(struct pci_dev *dev,
635 int resno)
636{
637 return pci_iov_resource_size(dev, resno);
638}
639
640/**
641 * pci_sriov_resource_alignment - get resource alignment for VF BAR
642 * @dev: the PCI device
643 * @resno: the resource number
644 *
645 * Returns the alignment of the VF BAR found in the SR-IOV capability.
646 * This is not the same as the resource size which is defined as
647 * the VF BAR size multiplied by the number of VFs. The alignment
648 * is just the VF BAR size.
649 */
650resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno)
651{
652 return pcibios_iov_resource_alignment(dev, resno);
653}
654
655/**
656 * pci_restore_iov_state - restore the state of the IOV capability
657 * @dev: the PCI device
658 */
659void pci_restore_iov_state(struct pci_dev *dev)
660{
661 if (dev->is_physfn)
662 sriov_restore_state(dev);
663}
664
665/**
666 * pci_vf_drivers_autoprobe - set PF property drivers_autoprobe for VFs
667 * @dev: the PCI device
668 * @auto_probe: set VF drivers auto probe flag
669 */
670void pci_vf_drivers_autoprobe(struct pci_dev *dev, bool auto_probe)
671{
672 if (dev->is_physfn)
673 dev->sriov->drivers_autoprobe = auto_probe;
674}
675
676/**
677 * pci_iov_bus_range - find bus range used by Virtual Function
678 * @bus: the PCI bus
679 *
680 * Returns max number of buses (exclude current one) used by Virtual
681 * Functions.
682 */
683int pci_iov_bus_range(struct pci_bus *bus)
684{
685 int max = 0;
686 struct pci_dev *dev;
687
688 list_for_each_entry(dev, &bus->devices, bus_list) {
689 if (!dev->is_physfn)
690 continue;
691 if (dev->sriov->max_VF_buses > max)
692 max = dev->sriov->max_VF_buses;
693 }
694
695 return max ? max - bus->number : 0;
696}
697
698/**
699 * pci_enable_sriov - enable the SR-IOV capability
700 * @dev: the PCI device
701 * @nr_virtfn: number of virtual functions to enable
702 *
703 * Returns 0 on success, or negative on failure.
704 */
705int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
706{
707 might_sleep();
708
709 if (!dev->is_physfn)
710 return -ENOSYS;
711
712 return sriov_enable(dev, nr_virtfn);
713}
714EXPORT_SYMBOL_GPL(pci_enable_sriov);
715
716/**
717 * pci_disable_sriov - disable the SR-IOV capability
718 * @dev: the PCI device
719 */
720void pci_disable_sriov(struct pci_dev *dev)
721{
722 might_sleep();
723
724 if (!dev->is_physfn)
725 return;
726
727 sriov_disable(dev);
728}
729EXPORT_SYMBOL_GPL(pci_disable_sriov);
730
731/**
732 * pci_num_vf - return number of VFs associated with a PF device_release_driver
733 * @dev: the PCI device
734 *
735 * Returns number of VFs, or 0 if SR-IOV is not enabled.
736 */
737int pci_num_vf(struct pci_dev *dev)
738{
739 if (!dev->is_physfn)
740 return 0;
741
742 return dev->sriov->num_VFs;
743}
744EXPORT_SYMBOL_GPL(pci_num_vf);
745
746/**
747 * pci_vfs_assigned - returns number of VFs are assigned to a guest
748 * @dev: the PCI device
749 *
750 * Returns number of VFs belonging to this device that are assigned to a guest.
751 * If device is not a physical function returns 0.
752 */
753int pci_vfs_assigned(struct pci_dev *dev)
754{
755 struct pci_dev *vfdev;
756 unsigned int vfs_assigned = 0;
757 unsigned short dev_id;
758
759 /* only search if we are a PF */
760 if (!dev->is_physfn)
761 return 0;
762
763 /*
764 * determine the device ID for the VFs, the vendor ID will be the
765 * same as the PF so there is no need to check for that one
766 */
767 dev_id = dev->sriov->vf_device;
768
769 /* loop through all the VFs to see if we own any that are assigned */
770 vfdev = pci_get_device(dev->vendor, dev_id, NULL);
771 while (vfdev) {
772 /*
773 * It is considered assigned if it is a virtual function with
774 * our dev as the physical function and the assigned bit is set
775 */
776 if (vfdev->is_virtfn && (vfdev->physfn == dev) &&
777 pci_is_dev_assigned(vfdev))
778 vfs_assigned++;
779
780 vfdev = pci_get_device(dev->vendor, dev_id, vfdev);
781 }
782
783 return vfs_assigned;
784}
785EXPORT_SYMBOL_GPL(pci_vfs_assigned);
786
787/**
788 * pci_sriov_set_totalvfs -- reduce the TotalVFs available
789 * @dev: the PCI PF device
790 * @numvfs: number that should be used for TotalVFs supported
791 *
792 * Should be called from PF driver's probe routine with
793 * device's mutex held.
794 *
795 * Returns 0 if PF is an SRIOV-capable device and
796 * value of numvfs valid. If not a PF return -ENOSYS;
797 * if numvfs is invalid return -EINVAL;
798 * if VFs already enabled, return -EBUSY.
799 */
800int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs)
801{
802 if (!dev->is_physfn)
803 return -ENOSYS;
804 if (numvfs > dev->sriov->total_VFs)
805 return -EINVAL;
806
807 /* Shouldn't change if VFs already enabled */
808 if (dev->sriov->ctrl & PCI_SRIOV_CTRL_VFE)
809 return -EBUSY;
810 else
811 dev->sriov->driver_max_VFs = numvfs;
812
813 return 0;
814}
815EXPORT_SYMBOL_GPL(pci_sriov_set_totalvfs);
816
817/**
818 * pci_sriov_get_totalvfs -- get total VFs supported on this device
819 * @dev: the PCI PF device
820 *
821 * For a PCIe device with SRIOV support, return the PCIe
822 * SRIOV capability value of TotalVFs or the value of driver_max_VFs
823 * if the driver reduced it. Otherwise 0.
824 */
825int pci_sriov_get_totalvfs(struct pci_dev *dev)
826{
827 if (!dev->is_physfn)
828 return 0;
829
830 if (dev->sriov->driver_max_VFs)
831 return dev->sriov->driver_max_VFs;
832
833 return dev->sriov->total_VFs;
834}
835EXPORT_SYMBOL_GPL(pci_sriov_get_totalvfs);