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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
39
40
41
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
54
55
56
57
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
121
122
123
124
125
126
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
230
231
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
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
447
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
530
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
548
549
550
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
568
569
570void pci_iov_release(struct pci_dev *dev)
571{
572 if (dev->is_physfn)
573 sriov_release(dev);
574}
575
576
577
578
579
580
581
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
595
596
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
610
611
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
642
643
644
645
646
647
648
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
657
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
667
668
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
678
679
680
681
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
700
701
702
703
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
718
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
733
734
735
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
748
749
750
751
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
760 if (!dev->is_physfn)
761 return 0;
762
763
764
765
766
767 dev_id = dev->sriov->vf_device;
768
769
770 vfdev = pci_get_device(dev->vendor, dev_id, NULL);
771 while (vfdev) {
772
773
774
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
789
790
791
792
793
794
795
796
797
798
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
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
819
820
821
822
823
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);
836