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/export.h> |
13 | #include <linux/string.h> |
14 | #include <linux/delay.h> |
15 | #include "pci.h" |
16 | |
17 | #define VIRTFN_ID_LEN 17 /* "virtfn%u\0" for 2^32 - 1 */ |
18 | |
19 | int 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 | |
27 | int 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 | EXPORT_SYMBOL_GPL(pci_iov_virtfn_devfn); |
35 | |
36 | int pci_iov_vf_id(struct pci_dev *dev) |
37 | { |
38 | struct pci_dev *pf; |
39 | |
40 | if (!dev->is_virtfn) |
41 | return -EINVAL; |
42 | |
43 | pf = pci_physfn(dev); |
44 | return (pci_dev_id(dev) - (pci_dev_id(dev: pf) + pf->sriov->offset)) / |
45 | pf->sriov->stride; |
46 | } |
47 | EXPORT_SYMBOL_GPL(pci_iov_vf_id); |
48 | |
49 | /** |
50 | * pci_iov_get_pf_drvdata - Return the drvdata of a PF |
51 | * @dev: VF pci_dev |
52 | * @pf_driver: Device driver required to own the PF |
53 | * |
54 | * This must be called from a context that ensures that a VF driver is attached. |
55 | * The value returned is invalid once the VF driver completes its remove() |
56 | * callback. |
57 | * |
58 | * Locking is achieved by the driver core. A VF driver cannot be probed until |
59 | * pci_enable_sriov() is called and pci_disable_sriov() does not return until |
60 | * all VF drivers have completed their remove(). |
61 | * |
62 | * The PF driver must call pci_disable_sriov() before it begins to destroy the |
63 | * drvdata. |
64 | */ |
65 | void *pci_iov_get_pf_drvdata(struct pci_dev *dev, struct pci_driver *pf_driver) |
66 | { |
67 | struct pci_dev *pf_dev; |
68 | |
69 | if (!dev->is_virtfn) |
70 | return ERR_PTR(error: -EINVAL); |
71 | pf_dev = dev->physfn; |
72 | if (pf_dev->driver != pf_driver) |
73 | return ERR_PTR(error: -EINVAL); |
74 | return pci_get_drvdata(pdev: pf_dev); |
75 | } |
76 | EXPORT_SYMBOL_GPL(pci_iov_get_pf_drvdata); |
77 | |
78 | /* |
79 | * Per SR-IOV spec sec 3.3.10 and 3.3.11, First VF Offset and VF Stride may |
80 | * change when NumVFs changes. |
81 | * |
82 | * Update iov->offset and iov->stride when NumVFs is written. |
83 | */ |
84 | static inline void pci_iov_set_numvfs(struct pci_dev *dev, int nr_virtfn) |
85 | { |
86 | struct pci_sriov *iov = dev->sriov; |
87 | |
88 | pci_write_config_word(dev, where: iov->pos + PCI_SRIOV_NUM_VF, val: nr_virtfn); |
89 | pci_read_config_word(dev, where: iov->pos + PCI_SRIOV_VF_OFFSET, val: &iov->offset); |
90 | pci_read_config_word(dev, where: iov->pos + PCI_SRIOV_VF_STRIDE, val: &iov->stride); |
91 | } |
92 | |
93 | /* |
94 | * The PF consumes one bus number. NumVFs, First VF Offset, and VF Stride |
95 | * determine how many additional bus numbers will be consumed by VFs. |
96 | * |
97 | * Iterate over all valid NumVFs, validate offset and stride, and calculate |
98 | * the maximum number of bus numbers that could ever be required. |
99 | */ |
100 | static int compute_max_vf_buses(struct pci_dev *dev) |
101 | { |
102 | struct pci_sriov *iov = dev->sriov; |
103 | int nr_virtfn, busnr, rc = 0; |
104 | |
105 | for (nr_virtfn = iov->total_VFs; nr_virtfn; nr_virtfn--) { |
106 | pci_iov_set_numvfs(dev, nr_virtfn); |
107 | if (!iov->offset || (nr_virtfn > 1 && !iov->stride)) { |
108 | rc = -EIO; |
109 | goto out; |
110 | } |
111 | |
112 | busnr = pci_iov_virtfn_bus(dev, vf_id: nr_virtfn - 1); |
113 | if (busnr > iov->max_VF_buses) |
114 | iov->max_VF_buses = busnr; |
115 | } |
116 | |
117 | out: |
118 | pci_iov_set_numvfs(dev, nr_virtfn: 0); |
119 | return rc; |
120 | } |
121 | |
122 | static struct pci_bus *virtfn_add_bus(struct pci_bus *bus, int busnr) |
123 | { |
124 | struct pci_bus *child; |
125 | |
126 | if (bus->number == busnr) |
127 | return bus; |
128 | |
129 | child = pci_find_bus(domain: pci_domain_nr(bus), busnr); |
130 | if (child) |
131 | return child; |
132 | |
133 | child = pci_add_new_bus(parent: bus, NULL, busnr); |
134 | if (!child) |
135 | return NULL; |
136 | |
137 | pci_bus_insert_busn_res(b: child, bus: busnr, busmax: busnr); |
138 | |
139 | return child; |
140 | } |
141 | |
142 | static void virtfn_remove_bus(struct pci_bus *physbus, struct pci_bus *virtbus) |
143 | { |
144 | if (physbus != virtbus && list_empty(head: &virtbus->devices)) |
145 | pci_remove_bus(b: virtbus); |
146 | } |
147 | |
148 | resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno) |
149 | { |
150 | if (!dev->is_physfn) |
151 | return 0; |
152 | |
153 | return dev->sriov->barsz[resno - PCI_IOV_RESOURCES]; |
154 | } |
155 | |
156 | static void pci_read_vf_config_common(struct pci_dev *virtfn) |
157 | { |
158 | struct pci_dev *physfn = virtfn->physfn; |
159 | |
160 | /* |
161 | * Some config registers are the same across all associated VFs. |
162 | * Read them once from VF0 so we can skip reading them from the |
163 | * other VFs. |
164 | * |
165 | * PCIe r4.0, sec 9.3.4.1, technically doesn't require all VFs to |
166 | * have the same Revision ID and Subsystem ID, but we assume they |
167 | * do. |
168 | */ |
169 | pci_read_config_dword(dev: virtfn, PCI_CLASS_REVISION, |
170 | val: &physfn->sriov->class); |
171 | pci_read_config_byte(dev: virtfn, PCI_HEADER_TYPE, |
172 | val: &physfn->sriov->hdr_type); |
173 | pci_read_config_word(dev: virtfn, PCI_SUBSYSTEM_VENDOR_ID, |
174 | val: &physfn->sriov->subsystem_vendor); |
175 | pci_read_config_word(dev: virtfn, PCI_SUBSYSTEM_ID, |
176 | val: &physfn->sriov->subsystem_device); |
177 | } |
178 | |
179 | int pci_iov_sysfs_link(struct pci_dev *dev, |
180 | struct pci_dev *virtfn, int id) |
181 | { |
182 | char buf[VIRTFN_ID_LEN]; |
183 | int rc; |
184 | |
185 | sprintf(buf, fmt: "virtfn%u" , id); |
186 | rc = sysfs_create_link(kobj: &dev->dev.kobj, target: &virtfn->dev.kobj, name: buf); |
187 | if (rc) |
188 | goto failed; |
189 | rc = sysfs_create_link(kobj: &virtfn->dev.kobj, target: &dev->dev.kobj, name: "physfn" ); |
190 | if (rc) |
191 | goto failed1; |
192 | |
193 | kobject_uevent(kobj: &virtfn->dev.kobj, action: KOBJ_CHANGE); |
194 | |
195 | return 0; |
196 | |
197 | failed1: |
198 | sysfs_remove_link(kobj: &dev->dev.kobj, name: buf); |
199 | failed: |
200 | return rc; |
201 | } |
202 | |
203 | #ifdef CONFIG_PCI_MSI |
204 | static ssize_t sriov_vf_total_msix_show(struct device *dev, |
205 | struct device_attribute *attr, |
206 | char *buf) |
207 | { |
208 | struct pci_dev *pdev = to_pci_dev(dev); |
209 | u32 vf_total_msix = 0; |
210 | |
211 | device_lock(dev); |
212 | if (!pdev->driver || !pdev->driver->sriov_get_vf_total_msix) |
213 | goto unlock; |
214 | |
215 | vf_total_msix = pdev->driver->sriov_get_vf_total_msix(pdev); |
216 | unlock: |
217 | device_unlock(dev); |
218 | return sysfs_emit(buf, fmt: "%u\n" , vf_total_msix); |
219 | } |
220 | static DEVICE_ATTR_RO(sriov_vf_total_msix); |
221 | |
222 | static ssize_t sriov_vf_msix_count_store(struct device *dev, |
223 | struct device_attribute *attr, |
224 | const char *buf, size_t count) |
225 | { |
226 | struct pci_dev *vf_dev = to_pci_dev(dev); |
227 | struct pci_dev *pdev = pci_physfn(dev: vf_dev); |
228 | int val, ret = 0; |
229 | |
230 | if (kstrtoint(s: buf, base: 0, res: &val) < 0) |
231 | return -EINVAL; |
232 | |
233 | if (val < 0) |
234 | return -EINVAL; |
235 | |
236 | device_lock(dev: &pdev->dev); |
237 | if (!pdev->driver || !pdev->driver->sriov_set_msix_vec_count) { |
238 | ret = -EOPNOTSUPP; |
239 | goto err_pdev; |
240 | } |
241 | |
242 | device_lock(dev: &vf_dev->dev); |
243 | if (vf_dev->driver) { |
244 | /* |
245 | * A driver is already attached to this VF and has configured |
246 | * itself based on the current MSI-X vector count. Changing |
247 | * the vector size could mess up the driver, so block it. |
248 | */ |
249 | ret = -EBUSY; |
250 | goto err_dev; |
251 | } |
252 | |
253 | ret = pdev->driver->sriov_set_msix_vec_count(vf_dev, val); |
254 | |
255 | err_dev: |
256 | device_unlock(dev: &vf_dev->dev); |
257 | err_pdev: |
258 | device_unlock(dev: &pdev->dev); |
259 | return ret ? : count; |
260 | } |
261 | static DEVICE_ATTR_WO(sriov_vf_msix_count); |
262 | #endif |
263 | |
264 | static struct attribute *sriov_vf_dev_attrs[] = { |
265 | #ifdef CONFIG_PCI_MSI |
266 | &dev_attr_sriov_vf_msix_count.attr, |
267 | #endif |
268 | NULL, |
269 | }; |
270 | |
271 | static umode_t sriov_vf_attrs_are_visible(struct kobject *kobj, |
272 | struct attribute *a, int n) |
273 | { |
274 | struct device *dev = kobj_to_dev(kobj); |
275 | struct pci_dev *pdev = to_pci_dev(dev); |
276 | |
277 | if (!pdev->is_virtfn) |
278 | return 0; |
279 | |
280 | return a->mode; |
281 | } |
282 | |
283 | const struct attribute_group sriov_vf_dev_attr_group = { |
284 | .attrs = sriov_vf_dev_attrs, |
285 | .is_visible = sriov_vf_attrs_are_visible, |
286 | }; |
287 | |
288 | int pci_iov_add_virtfn(struct pci_dev *dev, int id) |
289 | { |
290 | int i; |
291 | int rc = -ENOMEM; |
292 | u64 size; |
293 | struct pci_dev *virtfn; |
294 | struct resource *res; |
295 | struct pci_sriov *iov = dev->sriov; |
296 | struct pci_bus *bus; |
297 | |
298 | bus = virtfn_add_bus(bus: dev->bus, busnr: pci_iov_virtfn_bus(dev, vf_id: id)); |
299 | if (!bus) |
300 | goto failed; |
301 | |
302 | virtfn = pci_alloc_dev(bus); |
303 | if (!virtfn) |
304 | goto failed0; |
305 | |
306 | virtfn->devfn = pci_iov_virtfn_devfn(dev, id); |
307 | virtfn->vendor = dev->vendor; |
308 | virtfn->device = iov->vf_device; |
309 | virtfn->is_virtfn = 1; |
310 | virtfn->physfn = pci_dev_get(dev); |
311 | virtfn->no_command_memory = 1; |
312 | |
313 | if (id == 0) |
314 | pci_read_vf_config_common(virtfn); |
315 | |
316 | rc = pci_setup_device(dev: virtfn); |
317 | if (rc) |
318 | goto failed1; |
319 | |
320 | virtfn->dev.parent = dev->dev.parent; |
321 | virtfn->multifunction = 0; |
322 | |
323 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { |
324 | res = &dev->resource[i + PCI_IOV_RESOURCES]; |
325 | if (!res->parent) |
326 | continue; |
327 | virtfn->resource[i].name = pci_name(pdev: virtfn); |
328 | virtfn->resource[i].flags = res->flags; |
329 | size = pci_iov_resource_size(dev, resno: i + PCI_IOV_RESOURCES); |
330 | virtfn->resource[i].start = res->start + size * id; |
331 | virtfn->resource[i].end = virtfn->resource[i].start + size - 1; |
332 | rc = request_resource(root: res, new: &virtfn->resource[i]); |
333 | BUG_ON(rc); |
334 | } |
335 | |
336 | pci_device_add(dev: virtfn, bus: virtfn->bus); |
337 | rc = pci_iov_sysfs_link(dev, virtfn, id); |
338 | if (rc) |
339 | goto failed1; |
340 | |
341 | pci_bus_add_device(dev: virtfn); |
342 | |
343 | return 0; |
344 | |
345 | failed1: |
346 | pci_stop_and_remove_bus_device(dev: virtfn); |
347 | pci_dev_put(dev); |
348 | failed0: |
349 | virtfn_remove_bus(physbus: dev->bus, virtbus: bus); |
350 | failed: |
351 | |
352 | return rc; |
353 | } |
354 | |
355 | void pci_iov_remove_virtfn(struct pci_dev *dev, int id) |
356 | { |
357 | char buf[VIRTFN_ID_LEN]; |
358 | struct pci_dev *virtfn; |
359 | |
360 | virtfn = pci_get_domain_bus_and_slot(domain: pci_domain_nr(bus: dev->bus), |
361 | bus: pci_iov_virtfn_bus(dev, vf_id: id), |
362 | devfn: pci_iov_virtfn_devfn(dev, id)); |
363 | if (!virtfn) |
364 | return; |
365 | |
366 | sprintf(buf, fmt: "virtfn%u" , id); |
367 | sysfs_remove_link(kobj: &dev->dev.kobj, name: buf); |
368 | /* |
369 | * pci_stop_dev() could have been called for this virtfn already, |
370 | * so the directory for the virtfn may have been removed before. |
371 | * Double check to avoid spurious sysfs warnings. |
372 | */ |
373 | if (virtfn->dev.kobj.sd) |
374 | sysfs_remove_link(kobj: &virtfn->dev.kobj, name: "physfn" ); |
375 | |
376 | pci_stop_and_remove_bus_device(dev: virtfn); |
377 | virtfn_remove_bus(physbus: dev->bus, virtbus: virtfn->bus); |
378 | |
379 | /* balance pci_get_domain_bus_and_slot() */ |
380 | pci_dev_put(dev: virtfn); |
381 | pci_dev_put(dev); |
382 | } |
383 | |
384 | static ssize_t sriov_totalvfs_show(struct device *dev, |
385 | struct device_attribute *attr, |
386 | char *buf) |
387 | { |
388 | struct pci_dev *pdev = to_pci_dev(dev); |
389 | |
390 | return sysfs_emit(buf, fmt: "%u\n" , pci_sriov_get_totalvfs(dev: pdev)); |
391 | } |
392 | |
393 | static ssize_t sriov_numvfs_show(struct device *dev, |
394 | struct device_attribute *attr, |
395 | char *buf) |
396 | { |
397 | struct pci_dev *pdev = to_pci_dev(dev); |
398 | u16 num_vfs; |
399 | |
400 | /* Serialize vs sriov_numvfs_store() so readers see valid num_VFs */ |
401 | device_lock(dev: &pdev->dev); |
402 | num_vfs = pdev->sriov->num_VFs; |
403 | device_unlock(dev: &pdev->dev); |
404 | |
405 | return sysfs_emit(buf, fmt: "%u\n" , num_vfs); |
406 | } |
407 | |
408 | /* |
409 | * num_vfs > 0; number of VFs to enable |
410 | * num_vfs = 0; disable all VFs |
411 | * |
412 | * Note: SRIOV spec does not allow partial VF |
413 | * disable, so it's all or none. |
414 | */ |
415 | static ssize_t sriov_numvfs_store(struct device *dev, |
416 | struct device_attribute *attr, |
417 | const char *buf, size_t count) |
418 | { |
419 | struct pci_dev *pdev = to_pci_dev(dev); |
420 | int ret = 0; |
421 | u16 num_vfs; |
422 | |
423 | if (kstrtou16(s: buf, base: 0, res: &num_vfs) < 0) |
424 | return -EINVAL; |
425 | |
426 | if (num_vfs > pci_sriov_get_totalvfs(dev: pdev)) |
427 | return -ERANGE; |
428 | |
429 | device_lock(dev: &pdev->dev); |
430 | |
431 | if (num_vfs == pdev->sriov->num_VFs) |
432 | goto exit; |
433 | |
434 | /* is PF driver loaded */ |
435 | if (!pdev->driver) { |
436 | pci_info(pdev, "no driver bound to device; cannot configure SR-IOV\n" ); |
437 | ret = -ENOENT; |
438 | goto exit; |
439 | } |
440 | |
441 | /* is PF driver loaded w/callback */ |
442 | if (!pdev->driver->sriov_configure) { |
443 | pci_info(pdev, "driver does not support SR-IOV configuration via sysfs\n" ); |
444 | ret = -ENOENT; |
445 | goto exit; |
446 | } |
447 | |
448 | if (num_vfs == 0) { |
449 | /* disable VFs */ |
450 | ret = pdev->driver->sriov_configure(pdev, 0); |
451 | goto exit; |
452 | } |
453 | |
454 | /* enable VFs */ |
455 | if (pdev->sriov->num_VFs) { |
456 | pci_warn(pdev, "%d VFs already enabled. Disable before enabling %d VFs\n" , |
457 | pdev->sriov->num_VFs, num_vfs); |
458 | ret = -EBUSY; |
459 | goto exit; |
460 | } |
461 | |
462 | ret = pdev->driver->sriov_configure(pdev, num_vfs); |
463 | if (ret < 0) |
464 | goto exit; |
465 | |
466 | if (ret != num_vfs) |
467 | pci_warn(pdev, "%d VFs requested; only %d enabled\n" , |
468 | num_vfs, ret); |
469 | |
470 | exit: |
471 | device_unlock(dev: &pdev->dev); |
472 | |
473 | if (ret < 0) |
474 | return ret; |
475 | |
476 | return count; |
477 | } |
478 | |
479 | static ssize_t sriov_offset_show(struct device *dev, |
480 | struct device_attribute *attr, |
481 | char *buf) |
482 | { |
483 | struct pci_dev *pdev = to_pci_dev(dev); |
484 | |
485 | return sysfs_emit(buf, fmt: "%u\n" , pdev->sriov->offset); |
486 | } |
487 | |
488 | static ssize_t sriov_stride_show(struct device *dev, |
489 | struct device_attribute *attr, |
490 | char *buf) |
491 | { |
492 | struct pci_dev *pdev = to_pci_dev(dev); |
493 | |
494 | return sysfs_emit(buf, fmt: "%u\n" , pdev->sriov->stride); |
495 | } |
496 | |
497 | static ssize_t sriov_vf_device_show(struct device *dev, |
498 | struct device_attribute *attr, |
499 | char *buf) |
500 | { |
501 | struct pci_dev *pdev = to_pci_dev(dev); |
502 | |
503 | return sysfs_emit(buf, fmt: "%x\n" , pdev->sriov->vf_device); |
504 | } |
505 | |
506 | static ssize_t sriov_drivers_autoprobe_show(struct device *dev, |
507 | struct device_attribute *attr, |
508 | char *buf) |
509 | { |
510 | struct pci_dev *pdev = to_pci_dev(dev); |
511 | |
512 | return sysfs_emit(buf, fmt: "%u\n" , pdev->sriov->drivers_autoprobe); |
513 | } |
514 | |
515 | static ssize_t sriov_drivers_autoprobe_store(struct device *dev, |
516 | struct device_attribute *attr, |
517 | const char *buf, size_t count) |
518 | { |
519 | struct pci_dev *pdev = to_pci_dev(dev); |
520 | bool drivers_autoprobe; |
521 | |
522 | if (kstrtobool(s: buf, res: &drivers_autoprobe) < 0) |
523 | return -EINVAL; |
524 | |
525 | pdev->sriov->drivers_autoprobe = drivers_autoprobe; |
526 | |
527 | return count; |
528 | } |
529 | |
530 | static DEVICE_ATTR_RO(sriov_totalvfs); |
531 | static DEVICE_ATTR_RW(sriov_numvfs); |
532 | static DEVICE_ATTR_RO(sriov_offset); |
533 | static DEVICE_ATTR_RO(sriov_stride); |
534 | static DEVICE_ATTR_RO(sriov_vf_device); |
535 | static DEVICE_ATTR_RW(sriov_drivers_autoprobe); |
536 | |
537 | static struct attribute *sriov_pf_dev_attrs[] = { |
538 | &dev_attr_sriov_totalvfs.attr, |
539 | &dev_attr_sriov_numvfs.attr, |
540 | &dev_attr_sriov_offset.attr, |
541 | &dev_attr_sriov_stride.attr, |
542 | &dev_attr_sriov_vf_device.attr, |
543 | &dev_attr_sriov_drivers_autoprobe.attr, |
544 | #ifdef CONFIG_PCI_MSI |
545 | &dev_attr_sriov_vf_total_msix.attr, |
546 | #endif |
547 | NULL, |
548 | }; |
549 | |
550 | static umode_t sriov_pf_attrs_are_visible(struct kobject *kobj, |
551 | struct attribute *a, int n) |
552 | { |
553 | struct device *dev = kobj_to_dev(kobj); |
554 | |
555 | if (!dev_is_pf(dev)) |
556 | return 0; |
557 | |
558 | return a->mode; |
559 | } |
560 | |
561 | const struct attribute_group sriov_pf_dev_attr_group = { |
562 | .attrs = sriov_pf_dev_attrs, |
563 | .is_visible = sriov_pf_attrs_are_visible, |
564 | }; |
565 | |
566 | int __weak pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs) |
567 | { |
568 | return 0; |
569 | } |
570 | |
571 | int __weak pcibios_sriov_disable(struct pci_dev *pdev) |
572 | { |
573 | return 0; |
574 | } |
575 | |
576 | static int sriov_add_vfs(struct pci_dev *dev, u16 num_vfs) |
577 | { |
578 | unsigned int i; |
579 | int rc; |
580 | |
581 | if (dev->no_vf_scan) |
582 | return 0; |
583 | |
584 | for (i = 0; i < num_vfs; i++) { |
585 | rc = pci_iov_add_virtfn(dev, id: i); |
586 | if (rc) |
587 | goto failed; |
588 | } |
589 | return 0; |
590 | failed: |
591 | while (i--) |
592 | pci_iov_remove_virtfn(dev, id: i); |
593 | |
594 | return rc; |
595 | } |
596 | |
597 | static int sriov_enable(struct pci_dev *dev, int nr_virtfn) |
598 | { |
599 | int rc; |
600 | int i; |
601 | int nres; |
602 | u16 initial; |
603 | struct resource *res; |
604 | struct pci_dev *pdev; |
605 | struct pci_sriov *iov = dev->sriov; |
606 | int bars = 0; |
607 | int bus; |
608 | |
609 | if (!nr_virtfn) |
610 | return 0; |
611 | |
612 | if (iov->num_VFs) |
613 | return -EINVAL; |
614 | |
615 | pci_read_config_word(dev, where: iov->pos + PCI_SRIOV_INITIAL_VF, val: &initial); |
616 | if (initial > iov->total_VFs || |
617 | (!(iov->cap & PCI_SRIOV_CAP_VFM) && (initial != iov->total_VFs))) |
618 | return -EIO; |
619 | |
620 | if (nr_virtfn < 0 || nr_virtfn > iov->total_VFs || |
621 | (!(iov->cap & PCI_SRIOV_CAP_VFM) && (nr_virtfn > initial))) |
622 | return -EINVAL; |
623 | |
624 | nres = 0; |
625 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { |
626 | bars |= (1 << (i + PCI_IOV_RESOURCES)); |
627 | res = &dev->resource[i + PCI_IOV_RESOURCES]; |
628 | if (res->parent) |
629 | nres++; |
630 | } |
631 | if (nres != iov->nres) { |
632 | pci_err(dev, "not enough MMIO resources for SR-IOV\n" ); |
633 | return -ENOMEM; |
634 | } |
635 | |
636 | bus = pci_iov_virtfn_bus(dev, vf_id: nr_virtfn - 1); |
637 | if (bus > dev->bus->busn_res.end) { |
638 | pci_err(dev, "can't enable %d VFs (bus %02x out of range of %pR)\n" , |
639 | nr_virtfn, bus, &dev->bus->busn_res); |
640 | return -ENOMEM; |
641 | } |
642 | |
643 | if (pci_enable_resources(dev, mask: bars)) { |
644 | pci_err(dev, "SR-IOV: IOV BARS not allocated\n" ); |
645 | return -ENOMEM; |
646 | } |
647 | |
648 | if (iov->link != dev->devfn) { |
649 | pdev = pci_get_slot(bus: dev->bus, devfn: iov->link); |
650 | if (!pdev) |
651 | return -ENODEV; |
652 | |
653 | if (!pdev->is_physfn) { |
654 | pci_dev_put(dev: pdev); |
655 | return -ENOSYS; |
656 | } |
657 | |
658 | rc = sysfs_create_link(kobj: &dev->dev.kobj, |
659 | target: &pdev->dev.kobj, name: "dep_link" ); |
660 | pci_dev_put(dev: pdev); |
661 | if (rc) |
662 | return rc; |
663 | } |
664 | |
665 | iov->initial_VFs = initial; |
666 | if (nr_virtfn < initial) |
667 | initial = nr_virtfn; |
668 | |
669 | rc = pcibios_sriov_enable(pdev: dev, num_vfs: initial); |
670 | if (rc) { |
671 | pci_err(dev, "failure %d from pcibios_sriov_enable()\n" , rc); |
672 | goto err_pcibios; |
673 | } |
674 | |
675 | pci_iov_set_numvfs(dev, nr_virtfn); |
676 | iov->ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE; |
677 | pci_cfg_access_lock(dev); |
678 | pci_write_config_word(dev, where: iov->pos + PCI_SRIOV_CTRL, val: iov->ctrl); |
679 | msleep(msecs: 100); |
680 | pci_cfg_access_unlock(dev); |
681 | |
682 | rc = sriov_add_vfs(dev, num_vfs: initial); |
683 | if (rc) |
684 | goto err_pcibios; |
685 | |
686 | kobject_uevent(kobj: &dev->dev.kobj, action: KOBJ_CHANGE); |
687 | iov->num_VFs = nr_virtfn; |
688 | |
689 | return 0; |
690 | |
691 | err_pcibios: |
692 | iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE); |
693 | pci_cfg_access_lock(dev); |
694 | pci_write_config_word(dev, where: iov->pos + PCI_SRIOV_CTRL, val: iov->ctrl); |
695 | ssleep(seconds: 1); |
696 | pci_cfg_access_unlock(dev); |
697 | |
698 | pcibios_sriov_disable(pdev: dev); |
699 | |
700 | if (iov->link != dev->devfn) |
701 | sysfs_remove_link(kobj: &dev->dev.kobj, name: "dep_link" ); |
702 | |
703 | pci_iov_set_numvfs(dev, nr_virtfn: 0); |
704 | return rc; |
705 | } |
706 | |
707 | static void sriov_del_vfs(struct pci_dev *dev) |
708 | { |
709 | struct pci_sriov *iov = dev->sriov; |
710 | int i; |
711 | |
712 | for (i = 0; i < iov->num_VFs; i++) |
713 | pci_iov_remove_virtfn(dev, id: i); |
714 | } |
715 | |
716 | static void sriov_disable(struct pci_dev *dev) |
717 | { |
718 | struct pci_sriov *iov = dev->sriov; |
719 | |
720 | if (!iov->num_VFs) |
721 | return; |
722 | |
723 | sriov_del_vfs(dev); |
724 | iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE); |
725 | pci_cfg_access_lock(dev); |
726 | pci_write_config_word(dev, where: iov->pos + PCI_SRIOV_CTRL, val: iov->ctrl); |
727 | ssleep(seconds: 1); |
728 | pci_cfg_access_unlock(dev); |
729 | |
730 | pcibios_sriov_disable(pdev: dev); |
731 | |
732 | if (iov->link != dev->devfn) |
733 | sysfs_remove_link(kobj: &dev->dev.kobj, name: "dep_link" ); |
734 | |
735 | iov->num_VFs = 0; |
736 | pci_iov_set_numvfs(dev, nr_virtfn: 0); |
737 | } |
738 | |
739 | static int sriov_init(struct pci_dev *dev, int pos) |
740 | { |
741 | int i, bar64; |
742 | int rc; |
743 | int nres; |
744 | u32 pgsz; |
745 | u16 ctrl, total; |
746 | struct pci_sriov *iov; |
747 | struct resource *res; |
748 | struct pci_dev *pdev; |
749 | |
750 | pci_read_config_word(dev, where: pos + PCI_SRIOV_CTRL, val: &ctrl); |
751 | if (ctrl & PCI_SRIOV_CTRL_VFE) { |
752 | pci_write_config_word(dev, where: pos + PCI_SRIOV_CTRL, val: 0); |
753 | ssleep(seconds: 1); |
754 | } |
755 | |
756 | ctrl = 0; |
757 | list_for_each_entry(pdev, &dev->bus->devices, bus_list) |
758 | if (pdev->is_physfn) |
759 | goto found; |
760 | |
761 | pdev = NULL; |
762 | if (pci_ari_enabled(bus: dev->bus)) |
763 | ctrl |= PCI_SRIOV_CTRL_ARI; |
764 | |
765 | found: |
766 | pci_write_config_word(dev, where: pos + PCI_SRIOV_CTRL, val: ctrl); |
767 | |
768 | pci_read_config_word(dev, where: pos + PCI_SRIOV_TOTAL_VF, val: &total); |
769 | if (!total) |
770 | return 0; |
771 | |
772 | pci_read_config_dword(dev, where: pos + PCI_SRIOV_SUP_PGSIZE, val: &pgsz); |
773 | i = PAGE_SHIFT > 12 ? PAGE_SHIFT - 12 : 0; |
774 | pgsz &= ~((1 << i) - 1); |
775 | if (!pgsz) |
776 | return -EIO; |
777 | |
778 | pgsz &= ~(pgsz - 1); |
779 | pci_write_config_dword(dev, where: pos + PCI_SRIOV_SYS_PGSIZE, val: pgsz); |
780 | |
781 | iov = kzalloc(size: sizeof(*iov), GFP_KERNEL); |
782 | if (!iov) |
783 | return -ENOMEM; |
784 | |
785 | nres = 0; |
786 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { |
787 | res = &dev->resource[i + PCI_IOV_RESOURCES]; |
788 | /* |
789 | * If it is already FIXED, don't change it, something |
790 | * (perhaps EA or header fixups) wants it this way. |
791 | */ |
792 | if (res->flags & IORESOURCE_PCI_FIXED) |
793 | bar64 = (res->flags & IORESOURCE_MEM_64) ? 1 : 0; |
794 | else |
795 | bar64 = __pci_read_base(dev, type: pci_bar_unknown, res, |
796 | reg: pos + PCI_SRIOV_BAR + i * 4); |
797 | if (!res->flags) |
798 | continue; |
799 | if (resource_size(res) & (PAGE_SIZE - 1)) { |
800 | rc = -EIO; |
801 | goto failed; |
802 | } |
803 | iov->barsz[i] = resource_size(res); |
804 | res->end = res->start + resource_size(res) * total - 1; |
805 | pci_info(dev, "VF(n) BAR%d space: %pR (contains BAR%d for %d VFs)\n" , |
806 | i, res, i, total); |
807 | i += bar64; |
808 | nres++; |
809 | } |
810 | |
811 | iov->pos = pos; |
812 | iov->nres = nres; |
813 | iov->ctrl = ctrl; |
814 | iov->total_VFs = total; |
815 | iov->driver_max_VFs = total; |
816 | pci_read_config_word(dev, where: pos + PCI_SRIOV_VF_DID, val: &iov->vf_device); |
817 | iov->pgsz = pgsz; |
818 | iov->self = dev; |
819 | iov->drivers_autoprobe = true; |
820 | pci_read_config_dword(dev, where: pos + PCI_SRIOV_CAP, val: &iov->cap); |
821 | pci_read_config_byte(dev, where: pos + PCI_SRIOV_FUNC_LINK, val: &iov->link); |
822 | if (pci_pcie_type(dev) == PCI_EXP_TYPE_RC_END) |
823 | iov->link = PCI_DEVFN(PCI_SLOT(dev->devfn), iov->link); |
824 | |
825 | if (pdev) |
826 | iov->dev = pci_dev_get(dev: pdev); |
827 | else |
828 | iov->dev = dev; |
829 | |
830 | dev->sriov = iov; |
831 | dev->is_physfn = 1; |
832 | rc = compute_max_vf_buses(dev); |
833 | if (rc) |
834 | goto fail_max_buses; |
835 | |
836 | return 0; |
837 | |
838 | fail_max_buses: |
839 | dev->sriov = NULL; |
840 | dev->is_physfn = 0; |
841 | failed: |
842 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { |
843 | res = &dev->resource[i + PCI_IOV_RESOURCES]; |
844 | res->flags = 0; |
845 | } |
846 | |
847 | kfree(objp: iov); |
848 | return rc; |
849 | } |
850 | |
851 | static void sriov_release(struct pci_dev *dev) |
852 | { |
853 | BUG_ON(dev->sriov->num_VFs); |
854 | |
855 | if (dev != dev->sriov->dev) |
856 | pci_dev_put(dev: dev->sriov->dev); |
857 | |
858 | kfree(objp: dev->sriov); |
859 | dev->sriov = NULL; |
860 | } |
861 | |
862 | static void sriov_restore_state(struct pci_dev *dev) |
863 | { |
864 | int i; |
865 | u16 ctrl; |
866 | struct pci_sriov *iov = dev->sriov; |
867 | |
868 | pci_read_config_word(dev, where: iov->pos + PCI_SRIOV_CTRL, val: &ctrl); |
869 | if (ctrl & PCI_SRIOV_CTRL_VFE) |
870 | return; |
871 | |
872 | /* |
873 | * Restore PCI_SRIOV_CTRL_ARI before pci_iov_set_numvfs() because |
874 | * it reads offset & stride, which depend on PCI_SRIOV_CTRL_ARI. |
875 | */ |
876 | ctrl &= ~PCI_SRIOV_CTRL_ARI; |
877 | ctrl |= iov->ctrl & PCI_SRIOV_CTRL_ARI; |
878 | pci_write_config_word(dev, where: iov->pos + PCI_SRIOV_CTRL, val: ctrl); |
879 | |
880 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) |
881 | pci_update_resource(dev, resno: i + PCI_IOV_RESOURCES); |
882 | |
883 | pci_write_config_dword(dev, where: iov->pos + PCI_SRIOV_SYS_PGSIZE, val: iov->pgsz); |
884 | pci_iov_set_numvfs(dev, nr_virtfn: iov->num_VFs); |
885 | pci_write_config_word(dev, where: iov->pos + PCI_SRIOV_CTRL, val: iov->ctrl); |
886 | if (iov->ctrl & PCI_SRIOV_CTRL_VFE) |
887 | msleep(msecs: 100); |
888 | } |
889 | |
890 | /** |
891 | * pci_iov_init - initialize the IOV capability |
892 | * @dev: the PCI device |
893 | * |
894 | * Returns 0 on success, or negative on failure. |
895 | */ |
896 | int pci_iov_init(struct pci_dev *dev) |
897 | { |
898 | int pos; |
899 | |
900 | if (!pci_is_pcie(dev)) |
901 | return -ENODEV; |
902 | |
903 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV); |
904 | if (pos) |
905 | return sriov_init(dev, pos); |
906 | |
907 | return -ENODEV; |
908 | } |
909 | |
910 | /** |
911 | * pci_iov_release - release resources used by the IOV capability |
912 | * @dev: the PCI device |
913 | */ |
914 | void pci_iov_release(struct pci_dev *dev) |
915 | { |
916 | if (dev->is_physfn) |
917 | sriov_release(dev); |
918 | } |
919 | |
920 | /** |
921 | * pci_iov_remove - clean up SR-IOV state after PF driver is detached |
922 | * @dev: the PCI device |
923 | */ |
924 | void pci_iov_remove(struct pci_dev *dev) |
925 | { |
926 | struct pci_sriov *iov = dev->sriov; |
927 | |
928 | if (!dev->is_physfn) |
929 | return; |
930 | |
931 | iov->driver_max_VFs = iov->total_VFs; |
932 | if (iov->num_VFs) |
933 | pci_warn(dev, "driver left SR-IOV enabled after remove\n" ); |
934 | } |
935 | |
936 | /** |
937 | * pci_iov_update_resource - update a VF BAR |
938 | * @dev: the PCI device |
939 | * @resno: the resource number |
940 | * |
941 | * Update a VF BAR in the SR-IOV capability of a PF. |
942 | */ |
943 | void pci_iov_update_resource(struct pci_dev *dev, int resno) |
944 | { |
945 | struct pci_sriov *iov = dev->is_physfn ? dev->sriov : NULL; |
946 | struct resource *res = dev->resource + resno; |
947 | int vf_bar = resno - PCI_IOV_RESOURCES; |
948 | struct pci_bus_region region; |
949 | u16 cmd; |
950 | u32 new; |
951 | int reg; |
952 | |
953 | /* |
954 | * The generic pci_restore_bars() path calls this for all devices, |
955 | * including VFs and non-SR-IOV devices. If this is not a PF, we |
956 | * have nothing to do. |
957 | */ |
958 | if (!iov) |
959 | return; |
960 | |
961 | pci_read_config_word(dev, where: iov->pos + PCI_SRIOV_CTRL, val: &cmd); |
962 | if ((cmd & PCI_SRIOV_CTRL_VFE) && (cmd & PCI_SRIOV_CTRL_MSE)) { |
963 | dev_WARN(&dev->dev, "can't update enabled VF BAR%d %pR\n" , |
964 | vf_bar, res); |
965 | return; |
966 | } |
967 | |
968 | /* |
969 | * Ignore unimplemented BARs, unused resource slots for 64-bit |
970 | * BARs, and non-movable resources, e.g., those described via |
971 | * Enhanced Allocation. |
972 | */ |
973 | if (!res->flags) |
974 | return; |
975 | |
976 | if (res->flags & IORESOURCE_UNSET) |
977 | return; |
978 | |
979 | if (res->flags & IORESOURCE_PCI_FIXED) |
980 | return; |
981 | |
982 | pcibios_resource_to_bus(bus: dev->bus, region: ®ion, res); |
983 | new = region.start; |
984 | new |= res->flags & ~PCI_BASE_ADDRESS_MEM_MASK; |
985 | |
986 | reg = iov->pos + PCI_SRIOV_BAR + 4 * vf_bar; |
987 | pci_write_config_dword(dev, where: reg, val: new); |
988 | if (res->flags & IORESOURCE_MEM_64) { |
989 | new = region.start >> 16 >> 16; |
990 | pci_write_config_dword(dev, where: reg + 4, val: new); |
991 | } |
992 | } |
993 | |
994 | resource_size_t __weak pcibios_iov_resource_alignment(struct pci_dev *dev, |
995 | int resno) |
996 | { |
997 | return pci_iov_resource_size(dev, resno); |
998 | } |
999 | |
1000 | /** |
1001 | * pci_sriov_resource_alignment - get resource alignment for VF BAR |
1002 | * @dev: the PCI device |
1003 | * @resno: the resource number |
1004 | * |
1005 | * Returns the alignment of the VF BAR found in the SR-IOV capability. |
1006 | * This is not the same as the resource size which is defined as |
1007 | * the VF BAR size multiplied by the number of VFs. The alignment |
1008 | * is just the VF BAR size. |
1009 | */ |
1010 | resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno) |
1011 | { |
1012 | return pcibios_iov_resource_alignment(dev, resno); |
1013 | } |
1014 | |
1015 | /** |
1016 | * pci_restore_iov_state - restore the state of the IOV capability |
1017 | * @dev: the PCI device |
1018 | */ |
1019 | void pci_restore_iov_state(struct pci_dev *dev) |
1020 | { |
1021 | if (dev->is_physfn) |
1022 | sriov_restore_state(dev); |
1023 | } |
1024 | |
1025 | /** |
1026 | * pci_vf_drivers_autoprobe - set PF property drivers_autoprobe for VFs |
1027 | * @dev: the PCI device |
1028 | * @auto_probe: set VF drivers auto probe flag |
1029 | */ |
1030 | void pci_vf_drivers_autoprobe(struct pci_dev *dev, bool auto_probe) |
1031 | { |
1032 | if (dev->is_physfn) |
1033 | dev->sriov->drivers_autoprobe = auto_probe; |
1034 | } |
1035 | |
1036 | /** |
1037 | * pci_iov_bus_range - find bus range used by Virtual Function |
1038 | * @bus: the PCI bus |
1039 | * |
1040 | * Returns max number of buses (exclude current one) used by Virtual |
1041 | * Functions. |
1042 | */ |
1043 | int pci_iov_bus_range(struct pci_bus *bus) |
1044 | { |
1045 | int max = 0; |
1046 | struct pci_dev *dev; |
1047 | |
1048 | list_for_each_entry(dev, &bus->devices, bus_list) { |
1049 | if (!dev->is_physfn) |
1050 | continue; |
1051 | if (dev->sriov->max_VF_buses > max) |
1052 | max = dev->sriov->max_VF_buses; |
1053 | } |
1054 | |
1055 | return max ? max - bus->number : 0; |
1056 | } |
1057 | |
1058 | /** |
1059 | * pci_enable_sriov - enable the SR-IOV capability |
1060 | * @dev: the PCI device |
1061 | * @nr_virtfn: number of virtual functions to enable |
1062 | * |
1063 | * Returns 0 on success, or negative on failure. |
1064 | */ |
1065 | int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn) |
1066 | { |
1067 | might_sleep(); |
1068 | |
1069 | if (!dev->is_physfn) |
1070 | return -ENOSYS; |
1071 | |
1072 | return sriov_enable(dev, nr_virtfn); |
1073 | } |
1074 | EXPORT_SYMBOL_GPL(pci_enable_sriov); |
1075 | |
1076 | /** |
1077 | * pci_disable_sriov - disable the SR-IOV capability |
1078 | * @dev: the PCI device |
1079 | */ |
1080 | void pci_disable_sriov(struct pci_dev *dev) |
1081 | { |
1082 | might_sleep(); |
1083 | |
1084 | if (!dev->is_physfn) |
1085 | return; |
1086 | |
1087 | sriov_disable(dev); |
1088 | } |
1089 | EXPORT_SYMBOL_GPL(pci_disable_sriov); |
1090 | |
1091 | /** |
1092 | * pci_num_vf - return number of VFs associated with a PF device_release_driver |
1093 | * @dev: the PCI device |
1094 | * |
1095 | * Returns number of VFs, or 0 if SR-IOV is not enabled. |
1096 | */ |
1097 | int pci_num_vf(struct pci_dev *dev) |
1098 | { |
1099 | if (!dev->is_physfn) |
1100 | return 0; |
1101 | |
1102 | return dev->sriov->num_VFs; |
1103 | } |
1104 | EXPORT_SYMBOL_GPL(pci_num_vf); |
1105 | |
1106 | /** |
1107 | * pci_vfs_assigned - returns number of VFs are assigned to a guest |
1108 | * @dev: the PCI device |
1109 | * |
1110 | * Returns number of VFs belonging to this device that are assigned to a guest. |
1111 | * If device is not a physical function returns 0. |
1112 | */ |
1113 | int pci_vfs_assigned(struct pci_dev *dev) |
1114 | { |
1115 | struct pci_dev *vfdev; |
1116 | unsigned int vfs_assigned = 0; |
1117 | unsigned short dev_id; |
1118 | |
1119 | /* only search if we are a PF */ |
1120 | if (!dev->is_physfn) |
1121 | return 0; |
1122 | |
1123 | /* |
1124 | * determine the device ID for the VFs, the vendor ID will be the |
1125 | * same as the PF so there is no need to check for that one |
1126 | */ |
1127 | dev_id = dev->sriov->vf_device; |
1128 | |
1129 | /* loop through all the VFs to see if we own any that are assigned */ |
1130 | vfdev = pci_get_device(vendor: dev->vendor, device: dev_id, NULL); |
1131 | while (vfdev) { |
1132 | /* |
1133 | * It is considered assigned if it is a virtual function with |
1134 | * our dev as the physical function and the assigned bit is set |
1135 | */ |
1136 | if (vfdev->is_virtfn && (vfdev->physfn == dev) && |
1137 | pci_is_dev_assigned(pdev: vfdev)) |
1138 | vfs_assigned++; |
1139 | |
1140 | vfdev = pci_get_device(vendor: dev->vendor, device: dev_id, from: vfdev); |
1141 | } |
1142 | |
1143 | return vfs_assigned; |
1144 | } |
1145 | EXPORT_SYMBOL_GPL(pci_vfs_assigned); |
1146 | |
1147 | /** |
1148 | * pci_sriov_set_totalvfs -- reduce the TotalVFs available |
1149 | * @dev: the PCI PF device |
1150 | * @numvfs: number that should be used for TotalVFs supported |
1151 | * |
1152 | * Should be called from PF driver's probe routine with |
1153 | * device's mutex held. |
1154 | * |
1155 | * Returns 0 if PF is an SRIOV-capable device and |
1156 | * value of numvfs valid. If not a PF return -ENOSYS; |
1157 | * if numvfs is invalid return -EINVAL; |
1158 | * if VFs already enabled, return -EBUSY. |
1159 | */ |
1160 | int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs) |
1161 | { |
1162 | if (!dev->is_physfn) |
1163 | return -ENOSYS; |
1164 | |
1165 | if (numvfs > dev->sriov->total_VFs) |
1166 | return -EINVAL; |
1167 | |
1168 | /* Shouldn't change if VFs already enabled */ |
1169 | if (dev->sriov->ctrl & PCI_SRIOV_CTRL_VFE) |
1170 | return -EBUSY; |
1171 | |
1172 | dev->sriov->driver_max_VFs = numvfs; |
1173 | return 0; |
1174 | } |
1175 | EXPORT_SYMBOL_GPL(pci_sriov_set_totalvfs); |
1176 | |
1177 | /** |
1178 | * pci_sriov_get_totalvfs -- get total VFs supported on this device |
1179 | * @dev: the PCI PF device |
1180 | * |
1181 | * For a PCIe device with SRIOV support, return the PCIe |
1182 | * SRIOV capability value of TotalVFs or the value of driver_max_VFs |
1183 | * if the driver reduced it. Otherwise 0. |
1184 | */ |
1185 | int pci_sriov_get_totalvfs(struct pci_dev *dev) |
1186 | { |
1187 | if (!dev->is_physfn) |
1188 | return 0; |
1189 | |
1190 | return dev->sriov->driver_max_VFs; |
1191 | } |
1192 | EXPORT_SYMBOL_GPL(pci_sriov_get_totalvfs); |
1193 | |
1194 | /** |
1195 | * pci_sriov_configure_simple - helper to configure SR-IOV |
1196 | * @dev: the PCI device |
1197 | * @nr_virtfn: number of virtual functions to enable, 0 to disable |
1198 | * |
1199 | * Enable or disable SR-IOV for devices that don't require any PF setup |
1200 | * before enabling SR-IOV. Return value is negative on error, or number of |
1201 | * VFs allocated on success. |
1202 | */ |
1203 | int pci_sriov_configure_simple(struct pci_dev *dev, int nr_virtfn) |
1204 | { |
1205 | int rc; |
1206 | |
1207 | might_sleep(); |
1208 | |
1209 | if (!dev->is_physfn) |
1210 | return -ENODEV; |
1211 | |
1212 | if (pci_vfs_assigned(dev)) { |
1213 | pci_warn(dev, "Cannot modify SR-IOV while VFs are assigned\n" ); |
1214 | return -EPERM; |
1215 | } |
1216 | |
1217 | if (nr_virtfn == 0) { |
1218 | sriov_disable(dev); |
1219 | return 0; |
1220 | } |
1221 | |
1222 | rc = sriov_enable(dev, nr_virtfn); |
1223 | if (rc < 0) |
1224 | return rc; |
1225 | |
1226 | return nr_virtfn; |
1227 | } |
1228 | EXPORT_SYMBOL_GPL(pci_sriov_configure_simple); |
1229 | |