blob: b82c155d7b37f539eb85ce28512219a6b701cf52 [file] [log] [blame]
Yu Zhaod1b054d2009-03-20 11:25:11 +08001/*
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
Yu Zhao302b4212009-05-18 13:51:32 +08008 * Address Translation Service 1.0
Yu Zhaod1b054d2009-03-20 11:25:11 +08009 */
10
11#include <linux/pci.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090012#include <linux/slab.h>
Yu Zhaod1b054d2009-03-20 11:25:11 +080013#include <linux/mutex.h>
Paul Gortmaker363c75d2011-05-27 09:37:25 -040014#include <linux/export.h>
Yu Zhaod1b054d2009-03-20 11:25:11 +080015#include <linux/string.h>
16#include <linux/delay.h>
Joerg Roedel5cdede22011-04-04 15:55:18 +020017#include <linux/pci-ats.h>
Yu Zhaod1b054d2009-03-20 11:25:11 +080018#include "pci.h"
19
Yu Zhaodd7cc442009-03-20 11:25:15 +080020#define VIRTFN_ID_LEN 16
Yu Zhaod1b054d2009-03-20 11:25:11 +080021
Yu Zhaoa28724b2009-03-20 11:25:13 +080022static 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
Yu Zhaodd7cc442009-03-20 11:25:15 +080034static 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)
Yu Zhao8c1c6992009-06-13 15:52:13 +0800117 __pci_reset_function(virtfn);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800118
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_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);
Yu Zhao8c1c6992009-06-13 15:52:13 +0800171 __pci_reset_function(virtfn);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800172 }
173
174 sprintf(buf, "virtfn%u", id);
175 sysfs_remove_link(&dev->dev.kobj, buf);
176 sysfs_remove_link(&virtfn->dev.kobj, "physfn");
177
178 mutex_lock(&iov->dev->sriov->lock);
179 pci_remove_bus_device(virtfn);
180 virtfn_remove_bus(dev->bus, virtfn_bus(dev, id));
181 mutex_unlock(&iov->dev->sriov->lock);
182
183 pci_dev_put(dev);
184}
185
Yu Zhao74bb1bc2009-03-20 11:25:16 +0800186static int sriov_migration(struct pci_dev *dev)
187{
188 u16 status;
189 struct pci_sriov *iov = dev->sriov;
190
191 if (!iov->nr_virtfn)
192 return 0;
193
194 if (!(iov->cap & PCI_SRIOV_CAP_VFM))
195 return 0;
196
197 pci_read_config_word(dev, iov->pos + PCI_SRIOV_STATUS, &status);
198 if (!(status & PCI_SRIOV_STATUS_VFM))
199 return 0;
200
201 schedule_work(&iov->mtask);
202
203 return 1;
204}
205
206static void sriov_migration_task(struct work_struct *work)
207{
208 int i;
209 u8 state;
210 u16 status;
211 struct pci_sriov *iov = container_of(work, struct pci_sriov, mtask);
212
213 for (i = iov->initial; i < iov->nr_virtfn; i++) {
214 state = readb(iov->mstate + i);
215 if (state == PCI_SRIOV_VFM_MI) {
216 writeb(PCI_SRIOV_VFM_AV, iov->mstate + i);
217 state = readb(iov->mstate + i);
218 if (state == PCI_SRIOV_VFM_AV)
219 virtfn_add(iov->self, i, 1);
220 } else if (state == PCI_SRIOV_VFM_MO) {
221 virtfn_remove(iov->self, i, 1);
222 writeb(PCI_SRIOV_VFM_UA, iov->mstate + i);
223 state = readb(iov->mstate + i);
224 if (state == PCI_SRIOV_VFM_AV)
225 virtfn_add(iov->self, i, 0);
226 }
227 }
228
229 pci_read_config_word(iov->self, iov->pos + PCI_SRIOV_STATUS, &status);
230 status &= ~PCI_SRIOV_STATUS_VFM;
231 pci_write_config_word(iov->self, iov->pos + PCI_SRIOV_STATUS, status);
232}
233
234static int sriov_enable_migration(struct pci_dev *dev, int nr_virtfn)
235{
236 int bir;
237 u32 table;
238 resource_size_t pa;
239 struct pci_sriov *iov = dev->sriov;
240
241 if (nr_virtfn <= iov->initial)
242 return 0;
243
244 pci_read_config_dword(dev, iov->pos + PCI_SRIOV_VFM, &table);
245 bir = PCI_SRIOV_VFM_BIR(table);
246 if (bir > PCI_STD_RESOURCE_END)
247 return -EIO;
248
249 table = PCI_SRIOV_VFM_OFFSET(table);
250 if (table + nr_virtfn > pci_resource_len(dev, bir))
251 return -EIO;
252
253 pa = pci_resource_start(dev, bir) + table;
254 iov->mstate = ioremap(pa, nr_virtfn);
255 if (!iov->mstate)
256 return -ENOMEM;
257
258 INIT_WORK(&iov->mtask, sriov_migration_task);
259
260 iov->ctrl |= PCI_SRIOV_CTRL_VFM | PCI_SRIOV_CTRL_INTR;
261 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
262
263 return 0;
264}
265
266static void sriov_disable_migration(struct pci_dev *dev)
267{
268 struct pci_sriov *iov = dev->sriov;
269
270 iov->ctrl &= ~(PCI_SRIOV_CTRL_VFM | PCI_SRIOV_CTRL_INTR);
271 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
272
273 cancel_work_sync(&iov->mtask);
274 iounmap(iov->mstate);
275}
276
Yu Zhaodd7cc442009-03-20 11:25:15 +0800277static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
278{
279 int rc;
280 int i, j;
281 int nres;
282 u16 offset, stride, initial;
283 struct resource *res;
284 struct pci_dev *pdev;
285 struct pci_sriov *iov = dev->sriov;
286
287 if (!nr_virtfn)
288 return 0;
289
290 if (iov->nr_virtfn)
291 return -EINVAL;
292
293 pci_read_config_word(dev, iov->pos + PCI_SRIOV_INITIAL_VF, &initial);
294 if (initial > iov->total ||
295 (!(iov->cap & PCI_SRIOV_CAP_VFM) && (initial != iov->total)))
296 return -EIO;
297
298 if (nr_virtfn < 0 || nr_virtfn > iov->total ||
299 (!(iov->cap & PCI_SRIOV_CAP_VFM) && (nr_virtfn > initial)))
300 return -EINVAL;
301
302 pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, nr_virtfn);
303 pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_OFFSET, &offset);
304 pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_STRIDE, &stride);
305 if (!offset || (nr_virtfn > 1 && !stride))
306 return -EIO;
307
308 nres = 0;
309 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
310 res = dev->resource + PCI_IOV_RESOURCES + i;
311 if (res->parent)
312 nres++;
313 }
314 if (nres != iov->nres) {
315 dev_err(&dev->dev, "not enough MMIO resources for SR-IOV\n");
316 return -ENOMEM;
317 }
318
319 iov->offset = offset;
320 iov->stride = stride;
321
322 if (virtfn_bus(dev, nr_virtfn - 1) > dev->bus->subordinate) {
323 dev_err(&dev->dev, "SR-IOV: bus number out of range\n");
324 return -ENOMEM;
325 }
326
327 if (iov->link != dev->devfn) {
328 pdev = pci_get_slot(dev->bus, iov->link);
329 if (!pdev)
330 return -ENODEV;
331
332 pci_dev_put(pdev);
333
334 if (!pdev->is_physfn)
335 return -ENODEV;
336
337 rc = sysfs_create_link(&dev->dev.kobj,
338 &pdev->dev.kobj, "dep_link");
339 if (rc)
340 return rc;
341 }
342
343 iov->ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE;
344 pci_block_user_cfg_access(dev);
345 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
346 msleep(100);
347 pci_unblock_user_cfg_access(dev);
348
349 iov->initial = initial;
350 if (nr_virtfn < initial)
351 initial = nr_virtfn;
352
353 for (i = 0; i < initial; i++) {
354 rc = virtfn_add(dev, i, 0);
355 if (rc)
356 goto failed;
357 }
358
Yu Zhao74bb1bc2009-03-20 11:25:16 +0800359 if (iov->cap & PCI_SRIOV_CAP_VFM) {
360 rc = sriov_enable_migration(dev, nr_virtfn);
361 if (rc)
362 goto failed;
363 }
364
Yu Zhaodd7cc442009-03-20 11:25:15 +0800365 kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE);
366 iov->nr_virtfn = nr_virtfn;
367
368 return 0;
369
370failed:
371 for (j = 0; j < i; j++)
372 virtfn_remove(dev, j, 0);
373
374 iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
375 pci_block_user_cfg_access(dev);
376 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
377 ssleep(1);
378 pci_unblock_user_cfg_access(dev);
379
380 if (iov->link != dev->devfn)
381 sysfs_remove_link(&dev->dev.kobj, "dep_link");
382
383 return rc;
384}
385
386static void sriov_disable(struct pci_dev *dev)
387{
388 int i;
389 struct pci_sriov *iov = dev->sriov;
390
391 if (!iov->nr_virtfn)
392 return;
393
Yu Zhao74bb1bc2009-03-20 11:25:16 +0800394 if (iov->cap & PCI_SRIOV_CAP_VFM)
395 sriov_disable_migration(dev);
396
Yu Zhaodd7cc442009-03-20 11:25:15 +0800397 for (i = 0; i < iov->nr_virtfn; i++)
398 virtfn_remove(dev, i, 0);
399
400 iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
401 pci_block_user_cfg_access(dev);
402 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
403 ssleep(1);
404 pci_unblock_user_cfg_access(dev);
405
406 if (iov->link != dev->devfn)
407 sysfs_remove_link(&dev->dev.kobj, "dep_link");
408
409 iov->nr_virtfn = 0;
410}
411
Yu Zhaod1b054d2009-03-20 11:25:11 +0800412static int sriov_init(struct pci_dev *dev, int pos)
413{
414 int i;
415 int rc;
416 int nres;
417 u32 pgsz;
418 u16 ctrl, total, offset, stride;
419 struct pci_sriov *iov;
420 struct resource *res;
421 struct pci_dev *pdev;
422
423 if (dev->pcie_type != PCI_EXP_TYPE_RC_END &&
424 dev->pcie_type != PCI_EXP_TYPE_ENDPOINT)
425 return -ENODEV;
426
427 pci_read_config_word(dev, pos + PCI_SRIOV_CTRL, &ctrl);
428 if (ctrl & PCI_SRIOV_CTRL_VFE) {
429 pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, 0);
430 ssleep(1);
431 }
432
433 pci_read_config_word(dev, pos + PCI_SRIOV_TOTAL_VF, &total);
434 if (!total)
435 return 0;
436
437 ctrl = 0;
438 list_for_each_entry(pdev, &dev->bus->devices, bus_list)
439 if (pdev->is_physfn)
440 goto found;
441
442 pdev = NULL;
443 if (pci_ari_enabled(dev->bus))
444 ctrl |= PCI_SRIOV_CTRL_ARI;
445
446found:
447 pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, ctrl);
448 pci_write_config_word(dev, pos + PCI_SRIOV_NUM_VF, total);
449 pci_read_config_word(dev, pos + PCI_SRIOV_VF_OFFSET, &offset);
450 pci_read_config_word(dev, pos + PCI_SRIOV_VF_STRIDE, &stride);
451 if (!offset || (total > 1 && !stride))
452 return -EIO;
453
454 pci_read_config_dword(dev, pos + PCI_SRIOV_SUP_PGSIZE, &pgsz);
455 i = PAGE_SHIFT > 12 ? PAGE_SHIFT - 12 : 0;
456 pgsz &= ~((1 << i) - 1);
457 if (!pgsz)
458 return -EIO;
459
460 pgsz &= ~(pgsz - 1);
461 pci_write_config_dword(dev, pos + PCI_SRIOV_SYS_PGSIZE, pgsz);
462
463 nres = 0;
464 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
465 res = dev->resource + PCI_IOV_RESOURCES + i;
466 i += __pci_read_base(dev, pci_bar_unknown, res,
467 pos + PCI_SRIOV_BAR + i * 4);
468 if (!res->flags)
469 continue;
470 if (resource_size(res) & (PAGE_SIZE - 1)) {
471 rc = -EIO;
472 goto failed;
473 }
474 res->end = res->start + resource_size(res) * total - 1;
475 nres++;
476 }
477
478 iov = kzalloc(sizeof(*iov), GFP_KERNEL);
479 if (!iov) {
480 rc = -ENOMEM;
481 goto failed;
482 }
483
484 iov->pos = pos;
485 iov->nres = nres;
486 iov->ctrl = ctrl;
487 iov->total = total;
488 iov->offset = offset;
489 iov->stride = stride;
490 iov->pgsz = pgsz;
491 iov->self = dev;
492 pci_read_config_dword(dev, pos + PCI_SRIOV_CAP, &iov->cap);
493 pci_read_config_byte(dev, pos + PCI_SRIOV_FUNC_LINK, &iov->link);
Yu Zhao4d135db2009-05-20 17:11:57 +0800494 if (dev->pcie_type == PCI_EXP_TYPE_RC_END)
495 iov->link = PCI_DEVFN(PCI_SLOT(dev->devfn), iov->link);
Yu Zhaod1b054d2009-03-20 11:25:11 +0800496
497 if (pdev)
498 iov->dev = pci_dev_get(pdev);
Yu Zhaoe277d2f2009-05-18 13:51:33 +0800499 else
Yu Zhaod1b054d2009-03-20 11:25:11 +0800500 iov->dev = dev;
Yu Zhaoe277d2f2009-05-18 13:51:33 +0800501
502 mutex_init(&iov->lock);
Yu Zhaod1b054d2009-03-20 11:25:11 +0800503
504 dev->sriov = iov;
505 dev->is_physfn = 1;
506
507 return 0;
508
509failed:
510 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
511 res = dev->resource + PCI_IOV_RESOURCES + i;
512 res->flags = 0;
513 }
514
515 return rc;
516}
517
518static void sriov_release(struct pci_dev *dev)
519{
Yu Zhaodd7cc442009-03-20 11:25:15 +0800520 BUG_ON(dev->sriov->nr_virtfn);
521
Yu Zhaoe277d2f2009-05-18 13:51:33 +0800522 if (dev != dev->sriov->dev)
Yu Zhaod1b054d2009-03-20 11:25:11 +0800523 pci_dev_put(dev->sriov->dev);
524
Yu Zhaoe277d2f2009-05-18 13:51:33 +0800525 mutex_destroy(&dev->sriov->lock);
526
Yu Zhaod1b054d2009-03-20 11:25:11 +0800527 kfree(dev->sriov);
528 dev->sriov = NULL;
529}
530
Yu Zhao8c5cdb62009-03-20 11:25:12 +0800531static void sriov_restore_state(struct pci_dev *dev)
532{
533 int i;
534 u16 ctrl;
535 struct pci_sriov *iov = dev->sriov;
536
537 pci_read_config_word(dev, iov->pos + PCI_SRIOV_CTRL, &ctrl);
538 if (ctrl & PCI_SRIOV_CTRL_VFE)
539 return;
540
541 for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++)
542 pci_update_resource(dev, i);
543
544 pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800545 pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, iov->nr_virtfn);
Yu Zhao8c5cdb62009-03-20 11:25:12 +0800546 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
547 if (iov->ctrl & PCI_SRIOV_CTRL_VFE)
548 msleep(100);
549}
550
Yu Zhaod1b054d2009-03-20 11:25:11 +0800551/**
552 * pci_iov_init - initialize the IOV capability
553 * @dev: the PCI device
554 *
555 * Returns 0 on success, or negative on failure.
556 */
557int pci_iov_init(struct pci_dev *dev)
558{
559 int pos;
560
Kenji Kaneshige5f4d91a2009-11-11 14:36:17 +0900561 if (!pci_is_pcie(dev))
Yu Zhaod1b054d2009-03-20 11:25:11 +0800562 return -ENODEV;
563
564 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV);
565 if (pos)
566 return sriov_init(dev, pos);
567
568 return -ENODEV;
569}
570
571/**
572 * pci_iov_release - release resources used by the IOV capability
573 * @dev: the PCI device
574 */
575void pci_iov_release(struct pci_dev *dev)
576{
577 if (dev->is_physfn)
578 sriov_release(dev);
579}
580
581/**
582 * pci_iov_resource_bar - get position of the SR-IOV BAR
583 * @dev: the PCI device
584 * @resno: the resource number
585 * @type: the BAR type to be filled in
586 *
587 * Returns position of the BAR encapsulated in the SR-IOV capability.
588 */
589int pci_iov_resource_bar(struct pci_dev *dev, int resno,
590 enum pci_bar_type *type)
591{
592 if (resno < PCI_IOV_RESOURCES || resno > PCI_IOV_RESOURCE_END)
593 return 0;
594
595 BUG_ON(!dev->is_physfn);
596
597 *type = pci_bar_unknown;
598
599 return dev->sriov->pos + PCI_SRIOV_BAR +
600 4 * (resno - PCI_IOV_RESOURCES);
601}
Yu Zhao8c5cdb62009-03-20 11:25:12 +0800602
603/**
Chris Wright6faf17f2009-08-28 13:00:06 -0700604 * pci_sriov_resource_alignment - get resource alignment for VF BAR
605 * @dev: the PCI device
606 * @resno: the resource number
607 *
608 * Returns the alignment of the VF BAR found in the SR-IOV capability.
609 * This is not the same as the resource size which is defined as
610 * the VF BAR size multiplied by the number of VFs. The alignment
611 * is just the VF BAR size.
612 */
Cam Macdonell0e522472010-09-07 17:25:20 -0700613resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno)
Chris Wright6faf17f2009-08-28 13:00:06 -0700614{
615 struct resource tmp;
616 enum pci_bar_type type;
617 int reg = pci_iov_resource_bar(dev, resno, &type);
618
619 if (!reg)
620 return 0;
621
622 __pci_read_base(dev, type, &tmp, reg);
623 return resource_alignment(&tmp);
624}
625
626/**
Yu Zhao8c5cdb62009-03-20 11:25:12 +0800627 * pci_restore_iov_state - restore the state of the IOV capability
628 * @dev: the PCI device
629 */
630void pci_restore_iov_state(struct pci_dev *dev)
631{
632 if (dev->is_physfn)
633 sriov_restore_state(dev);
634}
Yu Zhaoa28724b2009-03-20 11:25:13 +0800635
636/**
637 * pci_iov_bus_range - find bus range used by Virtual Function
638 * @bus: the PCI bus
639 *
640 * Returns max number of buses (exclude current one) used by Virtual
641 * Functions.
642 */
643int pci_iov_bus_range(struct pci_bus *bus)
644{
645 int max = 0;
646 u8 busnr;
647 struct pci_dev *dev;
648
649 list_for_each_entry(dev, &bus->devices, bus_list) {
650 if (!dev->is_physfn)
651 continue;
652 busnr = virtfn_bus(dev, dev->sriov->total - 1);
653 if (busnr > max)
654 max = busnr;
655 }
656
657 return max ? max - bus->number : 0;
658}
Yu Zhaodd7cc442009-03-20 11:25:15 +0800659
660/**
661 * pci_enable_sriov - enable the SR-IOV capability
662 * @dev: the PCI device
Randy Dunlap52a88732009-04-01 17:45:30 -0700663 * @nr_virtfn: number of virtual functions to enable
Yu Zhaodd7cc442009-03-20 11:25:15 +0800664 *
665 * Returns 0 on success, or negative on failure.
666 */
667int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
668{
669 might_sleep();
670
671 if (!dev->is_physfn)
672 return -ENODEV;
673
674 return sriov_enable(dev, nr_virtfn);
675}
676EXPORT_SYMBOL_GPL(pci_enable_sriov);
677
678/**
679 * pci_disable_sriov - disable the SR-IOV capability
680 * @dev: the PCI device
681 */
682void pci_disable_sriov(struct pci_dev *dev)
683{
684 might_sleep();
685
686 if (!dev->is_physfn)
687 return;
688
689 sriov_disable(dev);
690}
691EXPORT_SYMBOL_GPL(pci_disable_sriov);
Yu Zhao74bb1bc2009-03-20 11:25:16 +0800692
693/**
694 * pci_sriov_migration - notify SR-IOV core of Virtual Function Migration
695 * @dev: the PCI device
696 *
697 * Returns IRQ_HANDLED if the IRQ is handled, or IRQ_NONE if not.
698 *
699 * Physical Function driver is responsible to register IRQ handler using
700 * VF Migration Interrupt Message Number, and call this function when the
701 * interrupt is generated by the hardware.
702 */
703irqreturn_t pci_sriov_migration(struct pci_dev *dev)
704{
705 if (!dev->is_physfn)
706 return IRQ_NONE;
707
708 return sriov_migration(dev) ? IRQ_HANDLED : IRQ_NONE;
709}
710EXPORT_SYMBOL_GPL(pci_sriov_migration);
Yu Zhao302b4212009-05-18 13:51:32 +0800711
Williams, Mitch Afb8a0d92010-02-10 01:43:04 +0000712/**
713 * pci_num_vf - return number of VFs associated with a PF device_release_driver
714 * @dev: the PCI device
715 *
716 * Returns number of VFs, or 0 if SR-IOV is not enabled.
717 */
718int pci_num_vf(struct pci_dev *dev)
719{
720 if (!dev || !dev->is_physfn)
721 return 0;
722 else
723 return dev->sriov->nr_virtfn;
724}
725EXPORT_SYMBOL_GPL(pci_num_vf);