1
2
3
4
5
6
7
8
9
10#include <linux/pci.h>
11#include <linux/slab.h>
12#include <linux/export.h>
13#include <linux/string.h>
14#include <linux/delay.h>
15#include "pci.h"
16
17#define VIRTFN_ID_LEN 16
18
19int pci_iov_virtfn_bus(struct pci_dev *dev, int vf_id)
20{
21 if (!dev->is_physfn)
22 return -EINVAL;
23 return dev->bus->number + ((dev->devfn + dev->sriov->offset +
24 dev->sriov->stride * vf_id) >> 8);
25}
26
27int pci_iov_virtfn_devfn(struct pci_dev *dev, int vf_id)
28{
29 if (!dev->is_physfn)
30 return -EINVAL;
31 return (dev->devfn + dev->sriov->offset +
32 dev->sriov->stride * vf_id) & 0xff;
33}
34
35
36
37
38
39
40
41static inline void pci_iov_set_numvfs(struct pci_dev *dev, int nr_virtfn)
42{
43 struct pci_sriov *iov = dev->sriov;
44
45 pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, nr_virtfn);
46 pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_OFFSET, &iov->offset);
47 pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_STRIDE, &iov->stride);
48}
49
50
51
52
53
54
55
56
57static int compute_max_vf_buses(struct pci_dev *dev)
58{
59 struct pci_sriov *iov = dev->sriov;
60 int nr_virtfn, busnr, rc = 0;
61
62 for (nr_virtfn = iov->total_VFs; nr_virtfn; nr_virtfn--) {
63 pci_iov_set_numvfs(dev, nr_virtfn);
64 if (!iov->offset || (nr_virtfn > 1 && !iov->stride)) {
65 rc = -EIO;
66 goto out;
67 }
68
69 busnr = pci_iov_virtfn_bus(dev, nr_virtfn - 1);
70 if (busnr > iov->max_VF_buses)
71 iov->max_VF_buses = busnr;
72 }
73
74out:
75 pci_iov_set_numvfs(dev, 0);
76 return rc;
77}
78
79static struct pci_bus *virtfn_add_bus(struct pci_bus *bus, int busnr)
80{
81 struct pci_bus *child;
82
83 if (bus->number == busnr)
84 return bus;
85
86 child = pci_find_bus(pci_domain_nr(bus), busnr);
87 if (child)
88 return child;
89
90 child = pci_add_new_bus(bus, NULL, busnr);
91 if (!child)
92 return NULL;
93
94 pci_bus_insert_busn_res(child, busnr, busnr);
95
96 return child;
97}
98
99static void virtfn_remove_bus(struct pci_bus *physbus, struct pci_bus *virtbus)
100{
101 if (physbus != virtbus && list_empty(&virtbus->devices))
102 pci_remove_bus(virtbus);
103}
104
105resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno)
106{
107 if (!dev->is_physfn)
108 return 0;
109
110 return dev->sriov->barsz[resno - PCI_IOV_RESOURCES];
111}
112
113static void pci_read_vf_config_common(struct pci_dev *virtfn)
114{
115 struct pci_dev *physfn = virtfn->physfn;
116
117
118
119
120
121
122
123
124
125
126 pci_read_config_dword(virtfn, PCI_CLASS_REVISION,
127 &physfn->sriov->class);
128 pci_read_config_byte(virtfn, PCI_HEADER_TYPE,
129 &physfn->sriov->hdr_type);
130 pci_read_config_word(virtfn, PCI_SUBSYSTEM_VENDOR_ID,
131 &physfn->sriov->subsystem_vendor);
132 pci_read_config_word(virtfn, PCI_SUBSYSTEM_ID,
133 &physfn->sriov->subsystem_device);
134}
135
136int pci_iov_sysfs_link(struct pci_dev *dev,
137 struct pci_dev *virtfn, int id)
138{
139 char buf[VIRTFN_ID_LEN];
140 int rc;
141
142 sprintf(buf, "virtfn%u", id);
143 rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf);
144 if (rc)
145 goto failed;
146 rc = sysfs_create_link(&virtfn->dev.kobj, &dev->dev.kobj, "physfn");
147 if (rc)
148 goto failed1;
149
150 kobject_uevent(&virtfn->dev.kobj, KOBJ_CHANGE);
151
152 return 0;
153
154failed1:
155 sysfs_remove_link(&dev->dev.kobj, buf);
156failed:
157 return rc;
158}
159
160int pci_iov_add_virtfn(struct pci_dev *dev, int id)
161{
162 int i;
163 int rc = -ENOMEM;
164 u64 size;
165 struct pci_dev *virtfn;
166 struct resource *res;
167 struct pci_sriov *iov = dev->sriov;
168 struct pci_bus *bus;
169
170 bus = virtfn_add_bus(dev->bus, pci_iov_virtfn_bus(dev, id));
171 if (!bus)
172 goto failed;
173
174 virtfn = pci_alloc_dev(bus);
175 if (!virtfn)
176 goto failed0;
177
178 virtfn->devfn = pci_iov_virtfn_devfn(dev, id);
179 virtfn->vendor = dev->vendor;
180 virtfn->device = iov->vf_device;
181 virtfn->is_virtfn = 1;
182 virtfn->physfn = pci_dev_get(dev);
183
184 if (id == 0)
185 pci_read_vf_config_common(virtfn);
186
187 rc = pci_setup_device(virtfn);
188 if (rc)
189 goto failed1;
190
191 virtfn->dev.parent = dev->dev.parent;
192 virtfn->multifunction = 0;
193
194 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
195 res = &dev->resource[i + PCI_IOV_RESOURCES];
196 if (!res->parent)
197 continue;
198 virtfn->resource[i].name = pci_name(virtfn);
199 virtfn->resource[i].flags = res->flags;
200 size = pci_iov_resource_size(dev, i + PCI_IOV_RESOURCES);
201 virtfn->resource[i].start = res->start + size * id;
202 virtfn->resource[i].end = virtfn->resource[i].start + size - 1;
203 rc = request_resource(res, &virtfn->resource[i]);
204 BUG_ON(rc);
205 }
206
207 pci_device_add(virtfn, virtfn->bus);
208 rc = pci_iov_sysfs_link(dev, virtfn, id);
209 if (rc)
210 goto failed1;
211
212 pci_bus_add_device(virtfn);
213
214 return 0;
215
216failed1:
217 pci_stop_and_remove_bus_device(virtfn);
218 pci_dev_put(dev);
219failed0:
220 virtfn_remove_bus(dev->bus, bus);
221failed:
222
223 return rc;
224}
225
226void pci_iov_remove_virtfn(struct pci_dev *dev, int id)
227{
228 char buf[VIRTFN_ID_LEN];
229 struct pci_dev *virtfn;
230
231 virtfn = pci_get_domain_bus_and_slot(pci_domain_nr(dev->bus),
232 pci_iov_virtfn_bus(dev, id),
233 pci_iov_virtfn_devfn(dev, id));
234 if (!virtfn)
235 return;
236
237 sprintf(buf, "virtfn%u", id);
238 sysfs_remove_link(&dev->dev.kobj, buf);
239
240
241
242
243
244 if (virtfn->dev.kobj.sd)
245 sysfs_remove_link(&virtfn->dev.kobj, "physfn");
246
247 pci_stop_and_remove_bus_device(virtfn);
248 virtfn_remove_bus(dev->bus, virtfn->bus);
249
250
251 pci_dev_put(virtfn);
252 pci_dev_put(dev);
253}
254
255static ssize_t sriov_totalvfs_show(struct device *dev,
256 struct device_attribute *attr,
257 char *buf)
258{
259 struct pci_dev *pdev = to_pci_dev(dev);
260
261 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
262}
263
264static ssize_t sriov_numvfs_show(struct device *dev,
265 struct device_attribute *attr,
266 char *buf)
267{
268 struct pci_dev *pdev = to_pci_dev(dev);
269 u16 num_vfs;
270
271
272 device_lock(&pdev->dev);
273 num_vfs = pdev->sriov->num_VFs;
274 device_unlock(&pdev->dev);
275
276 return sprintf(buf, "%u\n", num_vfs);
277}
278
279
280
281
282
283
284
285
286static ssize_t sriov_numvfs_store(struct device *dev,
287 struct device_attribute *attr,
288 const char *buf, size_t count)
289{
290 struct pci_dev *pdev = to_pci_dev(dev);
291 int ret;
292 u16 num_vfs;
293
294 ret = kstrtou16(buf, 0, &num_vfs);
295 if (ret < 0)
296 return ret;
297
298 if (num_vfs > pci_sriov_get_totalvfs(pdev))
299 return -ERANGE;
300
301 device_lock(&pdev->dev);
302
303 if (num_vfs == pdev->sriov->num_VFs)
304 goto exit;
305
306
307 if (!pdev->driver || !pdev->driver->sriov_configure) {
308 pci_info(pdev, "Driver does not support SRIOV configuration via sysfs\n");
309 ret = -ENOENT;
310 goto exit;
311 }
312
313 if (num_vfs == 0) {
314
315 ret = pdev->driver->sriov_configure(pdev, 0);
316 goto exit;
317 }
318
319
320 if (pdev->sriov->num_VFs) {
321 pci_warn(pdev, "%d VFs already enabled. Disable before enabling %d VFs\n",
322 pdev->sriov->num_VFs, num_vfs);
323 ret = -EBUSY;
324 goto exit;
325 }
326
327 ret = pdev->driver->sriov_configure(pdev, num_vfs);
328 if (ret < 0)
329 goto exit;
330
331 if (ret != num_vfs)
332 pci_warn(pdev, "%d VFs requested; only %d enabled\n",
333 num_vfs, ret);
334
335exit:
336 device_unlock(&pdev->dev);
337
338 if (ret < 0)
339 return ret;
340
341 return count;
342}
343
344static ssize_t sriov_offset_show(struct device *dev,
345 struct device_attribute *attr,
346 char *buf)
347{
348 struct pci_dev *pdev = to_pci_dev(dev);
349
350 return sprintf(buf, "%u\n", pdev->sriov->offset);
351}
352
353static ssize_t sriov_stride_show(struct device *dev,
354 struct device_attribute *attr,
355 char *buf)
356{
357 struct pci_dev *pdev = to_pci_dev(dev);
358
359 return sprintf(buf, "%u\n", pdev->sriov->stride);
360}
361
362static ssize_t sriov_vf_device_show(struct device *dev,
363 struct device_attribute *attr,
364 char *buf)
365{
366 struct pci_dev *pdev = to_pci_dev(dev);
367
368 return sprintf(buf, "%x\n", pdev->sriov->vf_device);
369}
370
371static ssize_t sriov_drivers_autoprobe_show(struct device *dev,
372 struct device_attribute *attr,
373 char *buf)
374{
375 struct pci_dev *pdev = to_pci_dev(dev);
376
377 return sprintf(buf, "%u\n", pdev->sriov->drivers_autoprobe);
378}
379
380static ssize_t sriov_drivers_autoprobe_store(struct device *dev,
381 struct device_attribute *attr,
382 const char *buf, size_t count)
383{
384 struct pci_dev *pdev = to_pci_dev(dev);
385 bool drivers_autoprobe;
386
387 if (kstrtobool(buf, &drivers_autoprobe) < 0)
388 return -EINVAL;
389
390 pdev->sriov->drivers_autoprobe = drivers_autoprobe;
391
392 return count;
393}
394
395static DEVICE_ATTR_RO(sriov_totalvfs);
396static DEVICE_ATTR_RW(sriov_numvfs);
397static DEVICE_ATTR_RO(sriov_offset);
398static DEVICE_ATTR_RO(sriov_stride);
399static DEVICE_ATTR_RO(sriov_vf_device);
400static DEVICE_ATTR_RW(sriov_drivers_autoprobe);
401
402static struct attribute *sriov_dev_attrs[] = {
403 &dev_attr_sriov_totalvfs.attr,
404 &dev_attr_sriov_numvfs.attr,
405 &dev_attr_sriov_offset.attr,
406 &dev_attr_sriov_stride.attr,
407 &dev_attr_sriov_vf_device.attr,
408 &dev_attr_sriov_drivers_autoprobe.attr,
409 NULL,
410};
411
412static umode_t sriov_attrs_are_visible(struct kobject *kobj,
413 struct attribute *a, int n)
414{
415 struct device *dev = kobj_to_dev(kobj);
416
417 if (!dev_is_pf(dev))
418 return 0;
419
420 return a->mode;
421}
422
423const struct attribute_group sriov_dev_attr_group = {
424 .attrs = sriov_dev_attrs,
425 .is_visible = sriov_attrs_are_visible,
426};
427
428int __weak pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
429{
430 return 0;
431}
432
433int __weak pcibios_sriov_disable(struct pci_dev *pdev)
434{
435 return 0;
436}
437
438static int sriov_add_vfs(struct pci_dev *dev, u16 num_vfs)
439{
440 unsigned int i;
441 int rc;
442
443 if (dev->no_vf_scan)
444 return 0;
445
446 for (i = 0; i < num_vfs; i++) {
447 rc = pci_iov_add_virtfn(dev, i);
448 if (rc)
449 goto failed;
450 }
451 return 0;
452failed:
453 while (i--)
454 pci_iov_remove_virtfn(dev, i);
455
456 return rc;
457}
458
459static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
460{
461 int rc;
462 int i;
463 int nres;
464 u16 initial;
465 struct resource *res;
466 struct pci_dev *pdev;
467 struct pci_sriov *iov = dev->sriov;
468 int bars = 0;
469 int bus;
470
471 if (!nr_virtfn)
472 return 0;
473
474 if (iov->num_VFs)
475 return -EINVAL;
476
477 pci_read_config_word(dev, iov->pos + PCI_SRIOV_INITIAL_VF, &initial);
478 if (initial > iov->total_VFs ||
479 (!(iov->cap & PCI_SRIOV_CAP_VFM) && (initial != iov->total_VFs)))
480 return -EIO;
481
482 if (nr_virtfn < 0 || nr_virtfn > iov->total_VFs ||
483 (!(iov->cap & PCI_SRIOV_CAP_VFM) && (nr_virtfn > initial)))
484 return -EINVAL;
485
486 nres = 0;
487 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
488 bars |= (1 << (i + PCI_IOV_RESOURCES));
489 res = &dev->resource[i + PCI_IOV_RESOURCES];
490 if (res->parent)
491 nres++;
492 }
493 if (nres != iov->nres) {
494 pci_err(dev, "not enough MMIO resources for SR-IOV\n");
495 return -ENOMEM;
496 }
497
498 bus = pci_iov_virtfn_bus(dev, nr_virtfn - 1);
499 if (bus > dev->bus->busn_res.end) {
500 pci_err(dev, "can't enable %d VFs (bus %02x out of range of %pR)\n",
501 nr_virtfn, bus, &dev->bus->busn_res);
502 return -ENOMEM;
503 }
504
505 if (pci_enable_resources(dev, bars)) {
506 pci_err(dev, "SR-IOV: IOV BARS not allocated\n");
507 return -ENOMEM;
508 }
509
510 if (iov->link != dev->devfn) {
511 pdev = pci_get_slot(dev->bus, iov->link);
512 if (!pdev)
513 return -ENODEV;
514
515 if (!pdev->is_physfn) {
516 pci_dev_put(pdev);
517 return -ENOSYS;
518 }
519
520 rc = sysfs_create_link(&dev->dev.kobj,
521 &pdev->dev.kobj, "dep_link");
522 pci_dev_put(pdev);
523 if (rc)
524 return rc;
525 }
526
527 iov->initial_VFs = initial;
528 if (nr_virtfn < initial)
529 initial = nr_virtfn;
530
531 rc = pcibios_sriov_enable(dev, initial);
532 if (rc) {
533 pci_err(dev, "failure %d from pcibios_sriov_enable()\n", rc);
534 goto err_pcibios;
535 }
536
537 pci_iov_set_numvfs(dev, nr_virtfn);
538 iov->ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE;
539 pci_cfg_access_lock(dev);
540 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
541 msleep(100);
542 pci_cfg_access_unlock(dev);
543
544 rc = sriov_add_vfs(dev, initial);
545 if (rc)
546 goto err_pcibios;
547
548 kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE);
549 iov->num_VFs = nr_virtfn;
550
551 return 0;
552
553err_pcibios:
554 iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
555 pci_cfg_access_lock(dev);
556 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
557 ssleep(1);
558 pci_cfg_access_unlock(dev);
559
560 pcibios_sriov_disable(dev);
561
562 if (iov->link != dev->devfn)
563 sysfs_remove_link(&dev->dev.kobj, "dep_link");
564
565 pci_iov_set_numvfs(dev, 0);
566 return rc;
567}
568
569static void sriov_del_vfs(struct pci_dev *dev)
570{
571 struct pci_sriov *iov = dev->sriov;
572 int i;
573
574 for (i = 0; i < iov->num_VFs; i++)
575 pci_iov_remove_virtfn(dev, i);
576}
577
578static void sriov_disable(struct pci_dev *dev)
579{
580 struct pci_sriov *iov = dev->sriov;
581
582 if (!iov->num_VFs)
583 return;
584
585 sriov_del_vfs(dev);
586 iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
587 pci_cfg_access_lock(dev);
588 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
589 ssleep(1);
590 pci_cfg_access_unlock(dev);
591
592 pcibios_sriov_disable(dev);
593
594 if (iov->link != dev->devfn)
595 sysfs_remove_link(&dev->dev.kobj, "dep_link");
596
597 iov->num_VFs = 0;
598 pci_iov_set_numvfs(dev, 0);
599}
600
601static int sriov_init(struct pci_dev *dev, int pos)
602{
603 int i, bar64;
604 int rc;
605 int nres;
606 u32 pgsz;
607 u16 ctrl, total;
608 struct pci_sriov *iov;
609 struct resource *res;
610 struct pci_dev *pdev;
611
612 pci_read_config_word(dev, pos + PCI_SRIOV_CTRL, &ctrl);
613 if (ctrl & PCI_SRIOV_CTRL_VFE) {
614 pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, 0);
615 ssleep(1);
616 }
617
618 ctrl = 0;
619 list_for_each_entry(pdev, &dev->bus->devices, bus_list)
620 if (pdev->is_physfn)
621 goto found;
622
623 pdev = NULL;
624 if (pci_ari_enabled(dev->bus))
625 ctrl |= PCI_SRIOV_CTRL_ARI;
626
627found:
628 pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, ctrl);
629
630 pci_read_config_word(dev, pos + PCI_SRIOV_TOTAL_VF, &total);
631 if (!total)
632 return 0;
633
634 pci_read_config_dword(dev, pos + PCI_SRIOV_SUP_PGSIZE, &pgsz);
635 i = PAGE_SHIFT > 12 ? PAGE_SHIFT - 12 : 0;
636 pgsz &= ~((1 << i) - 1);
637 if (!pgsz)
638 return -EIO;
639
640 pgsz &= ~(pgsz - 1);
641 pci_write_config_dword(dev, pos + PCI_SRIOV_SYS_PGSIZE, pgsz);
642
643 iov = kzalloc(sizeof(*iov), GFP_KERNEL);
644 if (!iov)
645 return -ENOMEM;
646
647 nres = 0;
648 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
649 res = &dev->resource[i + PCI_IOV_RESOURCES];
650
651
652
653
654 if (res->flags & IORESOURCE_PCI_FIXED)
655 bar64 = (res->flags & IORESOURCE_MEM_64) ? 1 : 0;
656 else
657 bar64 = __pci_read_base(dev, pci_bar_unknown, res,
658 pos + PCI_SRIOV_BAR + i * 4);
659 if (!res->flags)
660 continue;
661 if (resource_size(res) & (PAGE_SIZE - 1)) {
662 rc = -EIO;
663 goto failed;
664 }
665 iov->barsz[i] = resource_size(res);
666 res->end = res->start + resource_size(res) * total - 1;
667 pci_info(dev, "VF(n) BAR%d space: %pR (contains BAR%d for %d VFs)\n",
668 i, res, i, total);
669 i += bar64;
670 nres++;
671 }
672
673 iov->pos = pos;
674 iov->nres = nres;
675 iov->ctrl = ctrl;
676 iov->total_VFs = total;
677 iov->driver_max_VFs = total;
678 pci_read_config_word(dev, pos + PCI_SRIOV_VF_DID, &iov->vf_device);
679 iov->pgsz = pgsz;
680 iov->self = dev;
681 iov->drivers_autoprobe = true;
682 pci_read_config_dword(dev, pos + PCI_SRIOV_CAP, &iov->cap);
683 pci_read_config_byte(dev, pos + PCI_SRIOV_FUNC_LINK, &iov->link);
684 if (pci_pcie_type(dev) == PCI_EXP_TYPE_RC_END)
685 iov->link = PCI_DEVFN(PCI_SLOT(dev->devfn), iov->link);
686
687 if (pdev)
688 iov->dev = pci_dev_get(pdev);
689 else
690 iov->dev = dev;
691
692 dev->sriov = iov;
693 dev->is_physfn = 1;
694 rc = compute_max_vf_buses(dev);
695 if (rc)
696 goto fail_max_buses;
697
698 return 0;
699
700fail_max_buses:
701 dev->sriov = NULL;
702 dev->is_physfn = 0;
703failed:
704 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
705 res = &dev->resource[i + PCI_IOV_RESOURCES];
706 res->flags = 0;
707 }
708
709 kfree(iov);
710 return rc;
711}
712
713static void sriov_release(struct pci_dev *dev)
714{
715 BUG_ON(dev->sriov->num_VFs);
716
717 if (dev != dev->sriov->dev)
718 pci_dev_put(dev->sriov->dev);
719
720 kfree(dev->sriov);
721 dev->sriov = NULL;
722}
723
724static void sriov_restore_state(struct pci_dev *dev)
725{
726 int i;
727 u16 ctrl;
728 struct pci_sriov *iov = dev->sriov;
729
730 pci_read_config_word(dev, iov->pos + PCI_SRIOV_CTRL, &ctrl);
731 if (ctrl & PCI_SRIOV_CTRL_VFE)
732 return;
733
734
735
736
737
738 ctrl &= ~PCI_SRIOV_CTRL_ARI;
739 ctrl |= iov->ctrl & PCI_SRIOV_CTRL_ARI;
740 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, ctrl);
741
742 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++)
743 pci_update_resource(dev, i + PCI_IOV_RESOURCES);
744
745 pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz);
746 pci_iov_set_numvfs(dev, iov->num_VFs);
747 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
748 if (iov->ctrl & PCI_SRIOV_CTRL_VFE)
749 msleep(100);
750}
751
752
753
754
755
756
757
758int pci_iov_init(struct pci_dev *dev)
759{
760 int pos;
761
762 if (!pci_is_pcie(dev))
763 return -ENODEV;
764
765 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV);
766 if (pos)
767 return sriov_init(dev, pos);
768
769 return -ENODEV;
770}
771
772
773
774
775
776void pci_iov_release(struct pci_dev *dev)
777{
778 if (dev->is_physfn)
779 sriov_release(dev);
780}
781
782
783
784
785
786void pci_iov_remove(struct pci_dev *dev)
787{
788 struct pci_sriov *iov = dev->sriov;
789
790 if (!dev->is_physfn)
791 return;
792
793 iov->driver_max_VFs = iov->total_VFs;
794 if (iov->num_VFs)
795 pci_warn(dev, "driver left SR-IOV enabled after remove\n");
796}
797
798
799
800
801
802
803
804
805void pci_iov_update_resource(struct pci_dev *dev, int resno)
806{
807 struct pci_sriov *iov = dev->is_physfn ? dev->sriov : NULL;
808 struct resource *res = dev->resource + resno;
809 int vf_bar = resno - PCI_IOV_RESOURCES;
810 struct pci_bus_region region;
811 u16 cmd;
812 u32 new;
813 int reg;
814
815
816
817
818
819
820 if (!iov)
821 return;
822
823 pci_read_config_word(dev, iov->pos + PCI_SRIOV_CTRL, &cmd);
824 if ((cmd & PCI_SRIOV_CTRL_VFE) && (cmd & PCI_SRIOV_CTRL_MSE)) {
825 dev_WARN(&dev->dev, "can't update enabled VF BAR%d %pR\n",
826 vf_bar, res);
827 return;
828 }
829
830
831
832
833
834
835 if (!res->flags)
836 return;
837
838 if (res->flags & IORESOURCE_UNSET)
839 return;
840
841 if (res->flags & IORESOURCE_PCI_FIXED)
842 return;
843
844 pcibios_resource_to_bus(dev->bus, ®ion, res);
845 new = region.start;
846 new |= res->flags & ~PCI_BASE_ADDRESS_MEM_MASK;
847
848 reg = iov->pos + PCI_SRIOV_BAR + 4 * vf_bar;
849 pci_write_config_dword(dev, reg, new);
850 if (res->flags & IORESOURCE_MEM_64) {
851 new = region.start >> 16 >> 16;
852 pci_write_config_dword(dev, reg + 4, new);
853 }
854}
855
856resource_size_t __weak pcibios_iov_resource_alignment(struct pci_dev *dev,
857 int resno)
858{
859 return pci_iov_resource_size(dev, resno);
860}
861
862
863
864
865
866
867
868
869
870
871
872resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno)
873{
874 return pcibios_iov_resource_alignment(dev, resno);
875}
876
877
878
879
880
881void pci_restore_iov_state(struct pci_dev *dev)
882{
883 if (dev->is_physfn)
884 sriov_restore_state(dev);
885}
886
887
888
889
890
891
892void pci_vf_drivers_autoprobe(struct pci_dev *dev, bool auto_probe)
893{
894 if (dev->is_physfn)
895 dev->sriov->drivers_autoprobe = auto_probe;
896}
897
898
899
900
901
902
903
904
905int pci_iov_bus_range(struct pci_bus *bus)
906{
907 int max = 0;
908 struct pci_dev *dev;
909
910 list_for_each_entry(dev, &bus->devices, bus_list) {
911 if (!dev->is_physfn)
912 continue;
913 if (dev->sriov->max_VF_buses > max)
914 max = dev->sriov->max_VF_buses;
915 }
916
917 return max ? max - bus->number : 0;
918}
919
920
921
922
923
924
925
926
927int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
928{
929 might_sleep();
930
931 if (!dev->is_physfn)
932 return -ENOSYS;
933
934 return sriov_enable(dev, nr_virtfn);
935}
936EXPORT_SYMBOL_GPL(pci_enable_sriov);
937
938
939
940
941
942void pci_disable_sriov(struct pci_dev *dev)
943{
944 might_sleep();
945
946 if (!dev->is_physfn)
947 return;
948
949 sriov_disable(dev);
950}
951EXPORT_SYMBOL_GPL(pci_disable_sriov);
952
953
954
955
956
957
958
959int pci_num_vf(struct pci_dev *dev)
960{
961 if (!dev->is_physfn)
962 return 0;
963
964 return dev->sriov->num_VFs;
965}
966EXPORT_SYMBOL_GPL(pci_num_vf);
967
968
969
970
971
972
973
974
975int pci_vfs_assigned(struct pci_dev *dev)
976{
977 struct pci_dev *vfdev;
978 unsigned int vfs_assigned = 0;
979 unsigned short dev_id;
980
981
982 if (!dev->is_physfn)
983 return 0;
984
985
986
987
988
989 dev_id = dev->sriov->vf_device;
990
991
992 vfdev = pci_get_device(dev->vendor, dev_id, NULL);
993 while (vfdev) {
994
995
996
997
998 if (vfdev->is_virtfn && (vfdev->physfn == dev) &&
999 pci_is_dev_assigned(vfdev))
1000 vfs_assigned++;
1001
1002 vfdev = pci_get_device(dev->vendor, dev_id, vfdev);
1003 }
1004
1005 return vfs_assigned;
1006}
1007EXPORT_SYMBOL_GPL(pci_vfs_assigned);
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs)
1023{
1024 if (!dev->is_physfn)
1025 return -ENOSYS;
1026
1027 if (numvfs > dev->sriov->total_VFs)
1028 return -EINVAL;
1029
1030
1031 if (dev->sriov->ctrl & PCI_SRIOV_CTRL_VFE)
1032 return -EBUSY;
1033
1034 dev->sriov->driver_max_VFs = numvfs;
1035 return 0;
1036}
1037EXPORT_SYMBOL_GPL(pci_sriov_set_totalvfs);
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047int pci_sriov_get_totalvfs(struct pci_dev *dev)
1048{
1049 if (!dev->is_physfn)
1050 return 0;
1051
1052 return dev->sriov->driver_max_VFs;
1053}
1054EXPORT_SYMBOL_GPL(pci_sriov_get_totalvfs);
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065int pci_sriov_configure_simple(struct pci_dev *dev, int nr_virtfn)
1066{
1067 int rc;
1068
1069 might_sleep();
1070
1071 if (!dev->is_physfn)
1072 return -ENODEV;
1073
1074 if (pci_vfs_assigned(dev)) {
1075 pci_warn(dev, "Cannot modify SR-IOV while VFs are assigned\n");
1076 return -EPERM;
1077 }
1078
1079 if (nr_virtfn == 0) {
1080 sriov_disable(dev);
1081 return 0;
1082 }
1083
1084 rc = sriov_enable(dev, nr_virtfn);
1085 if (rc < 0)
1086 return rc;
1087
1088 return nr_virtfn;
1089}
1090EXPORT_SYMBOL_GPL(pci_sriov_configure_simple);
1091