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Commit | Line | Data |
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d1b054da YZ |
1 | /* |
2 | * drivers/pci/iov.c | |
3 | * | |
4 | * Copyright (C) 2009 Intel Corporation, Yu Zhao <yu.zhao@intel.com> | |
5 | * | |
6 | * PCI Express I/O Virtualization (IOV) support. | |
7 | * Single Root IOV 1.0 | |
302b4215 | 8 | * Address Translation Service 1.0 |
d1b054da YZ |
9 | */ |
10 | ||
11 | #include <linux/pci.h> | |
5a0e3ad6 | 12 | #include <linux/slab.h> |
d1b054da | 13 | #include <linux/mutex.h> |
363c75db | 14 | #include <linux/export.h> |
d1b054da YZ |
15 | #include <linux/string.h> |
16 | #include <linux/delay.h> | |
5cdede24 | 17 | #include <linux/pci-ats.h> |
d1b054da YZ |
18 | #include "pci.h" |
19 | ||
dd7cc44d | 20 | #define VIRTFN_ID_LEN 16 |
d1b054da | 21 | |
a28724b0 YZ |
22 | static 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 | ||
28 | static 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 | ||
dd7cc44d YZ |
34 | static struct pci_bus *virtfn_add_bus(struct pci_bus *bus, int busnr) |
35 | { | |
dd7cc44d YZ |
36 | struct pci_bus *child; |
37 | ||
38 | if (bus->number == busnr) | |
39 | return bus; | |
40 | ||
41 | child = pci_find_bus(pci_domain_nr(bus), busnr); | |
42 | if (child) | |
43 | return child; | |
44 | ||
45 | child = pci_add_new_bus(bus, NULL, busnr); | |
46 | if (!child) | |
47 | return NULL; | |
48 | ||
b7eac055 | 49 | pci_bus_insert_busn_res(child, busnr, busnr); |
dd7cc44d YZ |
50 | |
51 | return child; | |
52 | } | |
53 | ||
dc087f2f | 54 | static void virtfn_remove_bus(struct pci_bus *physbus, struct pci_bus *virtbus) |
dd7cc44d | 55 | { |
dc087f2f JL |
56 | if (physbus != virtbus && list_empty(&virtbus->devices)) |
57 | pci_remove_bus(virtbus); | |
dd7cc44d YZ |
58 | } |
59 | ||
60 | static int virtfn_add(struct pci_dev *dev, int id, int reset) | |
61 | { | |
62 | int i; | |
dc087f2f | 63 | int rc = -ENOMEM; |
dd7cc44d YZ |
64 | u64 size; |
65 | char buf[VIRTFN_ID_LEN]; | |
66 | struct pci_dev *virtfn; | |
67 | struct resource *res; | |
68 | struct pci_sriov *iov = dev->sriov; | |
8b1fce04 | 69 | struct pci_bus *bus; |
dd7cc44d | 70 | |
dd7cc44d | 71 | mutex_lock(&iov->dev->sriov->lock); |
8b1fce04 | 72 | bus = virtfn_add_bus(dev->bus, virtfn_bus(dev, id)); |
dc087f2f JL |
73 | if (!bus) |
74 | goto failed; | |
75 | ||
76 | virtfn = pci_alloc_dev(bus); | |
dd7cc44d | 77 | if (!virtfn) |
dc087f2f | 78 | goto failed0; |
dd7cc44d | 79 | |
dd7cc44d YZ |
80 | virtfn->devfn = virtfn_devfn(dev, id); |
81 | virtfn->vendor = dev->vendor; | |
82 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_DID, &virtfn->device); | |
83 | pci_setup_device(virtfn); | |
84 | virtfn->dev.parent = dev->dev.parent; | |
fbf33f51 XH |
85 | virtfn->physfn = pci_dev_get(dev); |
86 | virtfn->is_virtfn = 1; | |
aa931977 | 87 | virtfn->multifunction = 0; |
dd7cc44d YZ |
88 | |
89 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { | |
90 | res = dev->resource + PCI_IOV_RESOURCES + i; | |
91 | if (!res->parent) | |
92 | continue; | |
93 | virtfn->resource[i].name = pci_name(virtfn); | |
94 | virtfn->resource[i].flags = res->flags; | |
95 | size = resource_size(res); | |
6b136724 | 96 | do_div(size, iov->total_VFs); |
dd7cc44d YZ |
97 | virtfn->resource[i].start = res->start + size * id; |
98 | virtfn->resource[i].end = virtfn->resource[i].start + size - 1; | |
99 | rc = request_resource(res, &virtfn->resource[i]); | |
100 | BUG_ON(rc); | |
101 | } | |
102 | ||
103 | if (reset) | |
8c1c699f | 104 | __pci_reset_function(virtfn); |
dd7cc44d YZ |
105 | |
106 | pci_device_add(virtfn, virtfn->bus); | |
107 | mutex_unlock(&iov->dev->sriov->lock); | |
108 | ||
c893d133 | 109 | pci_bus_add_device(virtfn); |
dd7cc44d YZ |
110 | sprintf(buf, "virtfn%u", id); |
111 | rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf); | |
112 | if (rc) | |
113 | goto failed1; | |
114 | rc = sysfs_create_link(&virtfn->dev.kobj, &dev->dev.kobj, "physfn"); | |
115 | if (rc) | |
116 | goto failed2; | |
117 | ||
118 | kobject_uevent(&virtfn->dev.kobj, KOBJ_CHANGE); | |
119 | ||
120 | return 0; | |
121 | ||
122 | failed2: | |
123 | sysfs_remove_link(&dev->dev.kobj, buf); | |
124 | failed1: | |
125 | pci_dev_put(dev); | |
126 | mutex_lock(&iov->dev->sriov->lock); | |
210647af | 127 | pci_stop_and_remove_bus_device(virtfn); |
dc087f2f JL |
128 | failed0: |
129 | virtfn_remove_bus(dev->bus, bus); | |
130 | failed: | |
dd7cc44d YZ |
131 | mutex_unlock(&iov->dev->sriov->lock); |
132 | ||
133 | return rc; | |
134 | } | |
135 | ||
136 | static void virtfn_remove(struct pci_dev *dev, int id, int reset) | |
137 | { | |
138 | char buf[VIRTFN_ID_LEN]; | |
dd7cc44d YZ |
139 | struct pci_dev *virtfn; |
140 | struct pci_sriov *iov = dev->sriov; | |
141 | ||
dc087f2f JL |
142 | virtfn = pci_get_domain_bus_and_slot(pci_domain_nr(dev->bus), |
143 | virtfn_bus(dev, id), | |
144 | virtfn_devfn(dev, id)); | |
dd7cc44d YZ |
145 | if (!virtfn) |
146 | return; | |
147 | ||
dd7cc44d YZ |
148 | if (reset) { |
149 | device_release_driver(&virtfn->dev); | |
8c1c699f | 150 | __pci_reset_function(virtfn); |
dd7cc44d YZ |
151 | } |
152 | ||
153 | sprintf(buf, "virtfn%u", id); | |
154 | sysfs_remove_link(&dev->dev.kobj, buf); | |
09cedbef YL |
155 | /* |
156 | * pci_stop_dev() could have been called for this virtfn already, | |
157 | * so the directory for the virtfn may have been removed before. | |
158 | * Double check to avoid spurious sysfs warnings. | |
159 | */ | |
160 | if (virtfn->dev.kobj.sd) | |
161 | sysfs_remove_link(&virtfn->dev.kobj, "physfn"); | |
dd7cc44d YZ |
162 | |
163 | mutex_lock(&iov->dev->sriov->lock); | |
210647af | 164 | pci_stop_and_remove_bus_device(virtfn); |
dc087f2f | 165 | virtfn_remove_bus(dev->bus, virtfn->bus); |
dd7cc44d YZ |
166 | mutex_unlock(&iov->dev->sriov->lock); |
167 | ||
dc087f2f JL |
168 | /* balance pci_get_domain_bus_and_slot() */ |
169 | pci_dev_put(virtfn); | |
dd7cc44d YZ |
170 | pci_dev_put(dev); |
171 | } | |
172 | ||
173 | static int sriov_enable(struct pci_dev *dev, int nr_virtfn) | |
174 | { | |
175 | int rc; | |
176 | int i, j; | |
177 | int nres; | |
178 | u16 offset, stride, initial; | |
179 | struct resource *res; | |
180 | struct pci_dev *pdev; | |
181 | struct pci_sriov *iov = dev->sriov; | |
bbef98ab | 182 | int bars = 0; |
dd7cc44d YZ |
183 | |
184 | if (!nr_virtfn) | |
185 | return 0; | |
186 | ||
6b136724 | 187 | if (iov->num_VFs) |
dd7cc44d YZ |
188 | return -EINVAL; |
189 | ||
190 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_INITIAL_VF, &initial); | |
6b136724 BH |
191 | if (initial > iov->total_VFs || |
192 | (!(iov->cap & PCI_SRIOV_CAP_VFM) && (initial != iov->total_VFs))) | |
dd7cc44d YZ |
193 | return -EIO; |
194 | ||
6b136724 | 195 | if (nr_virtfn < 0 || nr_virtfn > iov->total_VFs || |
dd7cc44d YZ |
196 | (!(iov->cap & PCI_SRIOV_CAP_VFM) && (nr_virtfn > initial))) |
197 | return -EINVAL; | |
198 | ||
dd7cc44d YZ |
199 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_OFFSET, &offset); |
200 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_STRIDE, &stride); | |
201 | if (!offset || (nr_virtfn > 1 && !stride)) | |
202 | return -EIO; | |
203 | ||
204 | nres = 0; | |
205 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { | |
bbef98ab | 206 | bars |= (1 << (i + PCI_IOV_RESOURCES)); |
dd7cc44d YZ |
207 | res = dev->resource + PCI_IOV_RESOURCES + i; |
208 | if (res->parent) | |
209 | nres++; | |
210 | } | |
211 | if (nres != iov->nres) { | |
212 | dev_err(&dev->dev, "not enough MMIO resources for SR-IOV\n"); | |
213 | return -ENOMEM; | |
214 | } | |
215 | ||
216 | iov->offset = offset; | |
217 | iov->stride = stride; | |
218 | ||
b918c62e | 219 | if (virtfn_bus(dev, nr_virtfn - 1) > dev->bus->busn_res.end) { |
dd7cc44d YZ |
220 | dev_err(&dev->dev, "SR-IOV: bus number out of range\n"); |
221 | return -ENOMEM; | |
222 | } | |
223 | ||
bbef98ab RP |
224 | if (pci_enable_resources(dev, bars)) { |
225 | dev_err(&dev->dev, "SR-IOV: IOV BARS not allocated\n"); | |
226 | return -ENOMEM; | |
227 | } | |
228 | ||
dd7cc44d YZ |
229 | if (iov->link != dev->devfn) { |
230 | pdev = pci_get_slot(dev->bus, iov->link); | |
231 | if (!pdev) | |
232 | return -ENODEV; | |
233 | ||
dc087f2f JL |
234 | if (!pdev->is_physfn) { |
235 | pci_dev_put(pdev); | |
652d1100 | 236 | return -ENOSYS; |
dc087f2f | 237 | } |
dd7cc44d YZ |
238 | |
239 | rc = sysfs_create_link(&dev->dev.kobj, | |
240 | &pdev->dev.kobj, "dep_link"); | |
dc087f2f | 241 | pci_dev_put(pdev); |
dd7cc44d YZ |
242 | if (rc) |
243 | return rc; | |
244 | } | |
245 | ||
19b6984e | 246 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, nr_virtfn); |
dd7cc44d | 247 | iov->ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE; |
fb51ccbf | 248 | pci_cfg_access_lock(dev); |
dd7cc44d YZ |
249 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); |
250 | msleep(100); | |
fb51ccbf | 251 | pci_cfg_access_unlock(dev); |
dd7cc44d | 252 | |
6b136724 | 253 | iov->initial_VFs = initial; |
dd7cc44d YZ |
254 | if (nr_virtfn < initial) |
255 | initial = nr_virtfn; | |
256 | ||
257 | for (i = 0; i < initial; i++) { | |
258 | rc = virtfn_add(dev, i, 0); | |
259 | if (rc) | |
260 | goto failed; | |
261 | } | |
262 | ||
263 | kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE); | |
6b136724 | 264 | iov->num_VFs = nr_virtfn; |
dd7cc44d YZ |
265 | |
266 | return 0; | |
267 | ||
268 | failed: | |
269 | for (j = 0; j < i; j++) | |
270 | virtfn_remove(dev, j, 0); | |
271 | ||
272 | iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE); | |
fb51ccbf | 273 | pci_cfg_access_lock(dev); |
dd7cc44d | 274 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); |
19b6984e | 275 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, 0); |
dd7cc44d | 276 | ssleep(1); |
fb51ccbf | 277 | pci_cfg_access_unlock(dev); |
dd7cc44d YZ |
278 | |
279 | if (iov->link != dev->devfn) | |
280 | sysfs_remove_link(&dev->dev.kobj, "dep_link"); | |
281 | ||
282 | return rc; | |
283 | } | |
284 | ||
285 | static void sriov_disable(struct pci_dev *dev) | |
286 | { | |
287 | int i; | |
288 | struct pci_sriov *iov = dev->sriov; | |
289 | ||
6b136724 | 290 | if (!iov->num_VFs) |
dd7cc44d YZ |
291 | return; |
292 | ||
6b136724 | 293 | for (i = 0; i < iov->num_VFs; i++) |
dd7cc44d YZ |
294 | virtfn_remove(dev, i, 0); |
295 | ||
296 | iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE); | |
fb51ccbf | 297 | pci_cfg_access_lock(dev); |
dd7cc44d YZ |
298 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); |
299 | ssleep(1); | |
fb51ccbf | 300 | pci_cfg_access_unlock(dev); |
dd7cc44d YZ |
301 | |
302 | if (iov->link != dev->devfn) | |
303 | sysfs_remove_link(&dev->dev.kobj, "dep_link"); | |
304 | ||
6b136724 | 305 | iov->num_VFs = 0; |
19b6984e | 306 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, 0); |
dd7cc44d YZ |
307 | } |
308 | ||
d1b054da YZ |
309 | static int sriov_init(struct pci_dev *dev, int pos) |
310 | { | |
311 | int i; | |
312 | int rc; | |
313 | int nres; | |
314 | u32 pgsz; | |
315 | u16 ctrl, total, offset, stride; | |
316 | struct pci_sriov *iov; | |
317 | struct resource *res; | |
318 | struct pci_dev *pdev; | |
319 | ||
62f87c0e YW |
320 | if (pci_pcie_type(dev) != PCI_EXP_TYPE_RC_END && |
321 | pci_pcie_type(dev) != PCI_EXP_TYPE_ENDPOINT) | |
d1b054da YZ |
322 | return -ENODEV; |
323 | ||
324 | pci_read_config_word(dev, pos + PCI_SRIOV_CTRL, &ctrl); | |
325 | if (ctrl & PCI_SRIOV_CTRL_VFE) { | |
326 | pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, 0); | |
327 | ssleep(1); | |
328 | } | |
329 | ||
330 | pci_read_config_word(dev, pos + PCI_SRIOV_TOTAL_VF, &total); | |
331 | if (!total) | |
332 | return 0; | |
333 | ||
334 | ctrl = 0; | |
335 | list_for_each_entry(pdev, &dev->bus->devices, bus_list) | |
336 | if (pdev->is_physfn) | |
337 | goto found; | |
338 | ||
339 | pdev = NULL; | |
340 | if (pci_ari_enabled(dev->bus)) | |
341 | ctrl |= PCI_SRIOV_CTRL_ARI; | |
342 | ||
343 | found: | |
344 | pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, ctrl); | |
045cc22e | 345 | pci_write_config_word(dev, pos + PCI_SRIOV_NUM_VF, 0); |
d1b054da YZ |
346 | pci_read_config_word(dev, pos + PCI_SRIOV_VF_OFFSET, &offset); |
347 | pci_read_config_word(dev, pos + PCI_SRIOV_VF_STRIDE, &stride); | |
348 | if (!offset || (total > 1 && !stride)) | |
349 | return -EIO; | |
350 | ||
351 | pci_read_config_dword(dev, pos + PCI_SRIOV_SUP_PGSIZE, &pgsz); | |
352 | i = PAGE_SHIFT > 12 ? PAGE_SHIFT - 12 : 0; | |
353 | pgsz &= ~((1 << i) - 1); | |
354 | if (!pgsz) | |
355 | return -EIO; | |
356 | ||
357 | pgsz &= ~(pgsz - 1); | |
8161fe91 | 358 | pci_write_config_dword(dev, pos + PCI_SRIOV_SYS_PGSIZE, pgsz); |
d1b054da YZ |
359 | |
360 | nres = 0; | |
361 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { | |
362 | res = dev->resource + PCI_IOV_RESOURCES + i; | |
363 | i += __pci_read_base(dev, pci_bar_unknown, res, | |
364 | pos + PCI_SRIOV_BAR + i * 4); | |
365 | if (!res->flags) | |
366 | continue; | |
367 | if (resource_size(res) & (PAGE_SIZE - 1)) { | |
368 | rc = -EIO; | |
369 | goto failed; | |
370 | } | |
371 | res->end = res->start + resource_size(res) * total - 1; | |
372 | nres++; | |
373 | } | |
374 | ||
375 | iov = kzalloc(sizeof(*iov), GFP_KERNEL); | |
376 | if (!iov) { | |
377 | rc = -ENOMEM; | |
378 | goto failed; | |
379 | } | |
380 | ||
381 | iov->pos = pos; | |
382 | iov->nres = nres; | |
383 | iov->ctrl = ctrl; | |
6b136724 | 384 | iov->total_VFs = total; |
d1b054da YZ |
385 | iov->offset = offset; |
386 | iov->stride = stride; | |
387 | iov->pgsz = pgsz; | |
388 | iov->self = dev; | |
389 | pci_read_config_dword(dev, pos + PCI_SRIOV_CAP, &iov->cap); | |
390 | pci_read_config_byte(dev, pos + PCI_SRIOV_FUNC_LINK, &iov->link); | |
62f87c0e | 391 | if (pci_pcie_type(dev) == PCI_EXP_TYPE_RC_END) |
4d135dbe | 392 | iov->link = PCI_DEVFN(PCI_SLOT(dev->devfn), iov->link); |
d1b054da YZ |
393 | |
394 | if (pdev) | |
395 | iov->dev = pci_dev_get(pdev); | |
e277d2fc | 396 | else |
d1b054da | 397 | iov->dev = dev; |
e277d2fc YZ |
398 | |
399 | mutex_init(&iov->lock); | |
d1b054da YZ |
400 | |
401 | dev->sriov = iov; | |
402 | dev->is_physfn = 1; | |
403 | ||
404 | return 0; | |
405 | ||
406 | failed: | |
407 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { | |
408 | res = dev->resource + PCI_IOV_RESOURCES + i; | |
409 | res->flags = 0; | |
410 | } | |
411 | ||
412 | return rc; | |
413 | } | |
414 | ||
415 | static void sriov_release(struct pci_dev *dev) | |
416 | { | |
6b136724 | 417 | BUG_ON(dev->sriov->num_VFs); |
dd7cc44d | 418 | |
e277d2fc | 419 | if (dev != dev->sriov->dev) |
d1b054da YZ |
420 | pci_dev_put(dev->sriov->dev); |
421 | ||
e277d2fc YZ |
422 | mutex_destroy(&dev->sriov->lock); |
423 | ||
d1b054da YZ |
424 | kfree(dev->sriov); |
425 | dev->sriov = NULL; | |
426 | } | |
427 | ||
8c5cdb6a YZ |
428 | static void sriov_restore_state(struct pci_dev *dev) |
429 | { | |
430 | int i; | |
431 | u16 ctrl; | |
432 | struct pci_sriov *iov = dev->sriov; | |
433 | ||
434 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_CTRL, &ctrl); | |
435 | if (ctrl & PCI_SRIOV_CTRL_VFE) | |
436 | return; | |
437 | ||
438 | for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) | |
439 | pci_update_resource(dev, i); | |
440 | ||
441 | pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz); | |
6b136724 | 442 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, iov->num_VFs); |
8c5cdb6a YZ |
443 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); |
444 | if (iov->ctrl & PCI_SRIOV_CTRL_VFE) | |
445 | msleep(100); | |
446 | } | |
447 | ||
d1b054da YZ |
448 | /** |
449 | * pci_iov_init - initialize the IOV capability | |
450 | * @dev: the PCI device | |
451 | * | |
452 | * Returns 0 on success, or negative on failure. | |
453 | */ | |
454 | int pci_iov_init(struct pci_dev *dev) | |
455 | { | |
456 | int pos; | |
457 | ||
5f4d91a1 | 458 | if (!pci_is_pcie(dev)) |
d1b054da YZ |
459 | return -ENODEV; |
460 | ||
461 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV); | |
462 | if (pos) | |
463 | return sriov_init(dev, pos); | |
464 | ||
465 | return -ENODEV; | |
466 | } | |
467 | ||
468 | /** | |
469 | * pci_iov_release - release resources used by the IOV capability | |
470 | * @dev: the PCI device | |
471 | */ | |
472 | void pci_iov_release(struct pci_dev *dev) | |
473 | { | |
474 | if (dev->is_physfn) | |
475 | sriov_release(dev); | |
476 | } | |
477 | ||
478 | /** | |
479 | * pci_iov_resource_bar - get position of the SR-IOV BAR | |
480 | * @dev: the PCI device | |
481 | * @resno: the resource number | |
482 | * @type: the BAR type to be filled in | |
483 | * | |
484 | * Returns position of the BAR encapsulated in the SR-IOV capability. | |
485 | */ | |
486 | int pci_iov_resource_bar(struct pci_dev *dev, int resno, | |
487 | enum pci_bar_type *type) | |
488 | { | |
489 | if (resno < PCI_IOV_RESOURCES || resno > PCI_IOV_RESOURCE_END) | |
490 | return 0; | |
491 | ||
492 | BUG_ON(!dev->is_physfn); | |
493 | ||
494 | *type = pci_bar_unknown; | |
495 | ||
496 | return dev->sriov->pos + PCI_SRIOV_BAR + | |
497 | 4 * (resno - PCI_IOV_RESOURCES); | |
498 | } | |
8c5cdb6a | 499 | |
6faf17f6 CW |
500 | /** |
501 | * pci_sriov_resource_alignment - get resource alignment for VF BAR | |
502 | * @dev: the PCI device | |
503 | * @resno: the resource number | |
504 | * | |
505 | * Returns the alignment of the VF BAR found in the SR-IOV capability. | |
506 | * This is not the same as the resource size which is defined as | |
507 | * the VF BAR size multiplied by the number of VFs. The alignment | |
508 | * is just the VF BAR size. | |
509 | */ | |
0e52247a | 510 | resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno) |
6faf17f6 CW |
511 | { |
512 | struct resource tmp; | |
513 | enum pci_bar_type type; | |
514 | int reg = pci_iov_resource_bar(dev, resno, &type); | |
f7625980 | 515 | |
6faf17f6 CW |
516 | if (!reg) |
517 | return 0; | |
518 | ||
519 | __pci_read_base(dev, type, &tmp, reg); | |
520 | return resource_alignment(&tmp); | |
521 | } | |
522 | ||
8c5cdb6a YZ |
523 | /** |
524 | * pci_restore_iov_state - restore the state of the IOV capability | |
525 | * @dev: the PCI device | |
526 | */ | |
527 | void pci_restore_iov_state(struct pci_dev *dev) | |
528 | { | |
529 | if (dev->is_physfn) | |
530 | sriov_restore_state(dev); | |
531 | } | |
a28724b0 YZ |
532 | |
533 | /** | |
534 | * pci_iov_bus_range - find bus range used by Virtual Function | |
535 | * @bus: the PCI bus | |
536 | * | |
537 | * Returns max number of buses (exclude current one) used by Virtual | |
538 | * Functions. | |
539 | */ | |
540 | int pci_iov_bus_range(struct pci_bus *bus) | |
541 | { | |
542 | int max = 0; | |
543 | u8 busnr; | |
544 | struct pci_dev *dev; | |
545 | ||
546 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
547 | if (!dev->is_physfn) | |
548 | continue; | |
6b136724 | 549 | busnr = virtfn_bus(dev, dev->sriov->total_VFs - 1); |
a28724b0 YZ |
550 | if (busnr > max) |
551 | max = busnr; | |
552 | } | |
553 | ||
554 | return max ? max - bus->number : 0; | |
555 | } | |
dd7cc44d YZ |
556 | |
557 | /** | |
558 | * pci_enable_sriov - enable the SR-IOV capability | |
559 | * @dev: the PCI device | |
52a8873b | 560 | * @nr_virtfn: number of virtual functions to enable |
dd7cc44d YZ |
561 | * |
562 | * Returns 0 on success, or negative on failure. | |
563 | */ | |
564 | int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn) | |
565 | { | |
566 | might_sleep(); | |
567 | ||
568 | if (!dev->is_physfn) | |
652d1100 | 569 | return -ENOSYS; |
dd7cc44d YZ |
570 | |
571 | return sriov_enable(dev, nr_virtfn); | |
572 | } | |
573 | EXPORT_SYMBOL_GPL(pci_enable_sriov); | |
574 | ||
575 | /** | |
576 | * pci_disable_sriov - disable the SR-IOV capability | |
577 | * @dev: the PCI device | |
578 | */ | |
579 | void pci_disable_sriov(struct pci_dev *dev) | |
580 | { | |
581 | might_sleep(); | |
582 | ||
583 | if (!dev->is_physfn) | |
584 | return; | |
585 | ||
586 | sriov_disable(dev); | |
587 | } | |
588 | EXPORT_SYMBOL_GPL(pci_disable_sriov); | |
74bb1bcc | 589 | |
fb8a0d9d WM |
590 | /** |
591 | * pci_num_vf - return number of VFs associated with a PF device_release_driver | |
592 | * @dev: the PCI device | |
593 | * | |
594 | * Returns number of VFs, or 0 if SR-IOV is not enabled. | |
595 | */ | |
596 | int pci_num_vf(struct pci_dev *dev) | |
597 | { | |
1452cd76 | 598 | if (!dev->is_physfn) |
fb8a0d9d | 599 | return 0; |
1452cd76 BH |
600 | |
601 | return dev->sriov->num_VFs; | |
fb8a0d9d WM |
602 | } |
603 | EXPORT_SYMBOL_GPL(pci_num_vf); | |
bff73156 | 604 | |
5a8eb242 AD |
605 | /** |
606 | * pci_vfs_assigned - returns number of VFs are assigned to a guest | |
607 | * @dev: the PCI device | |
608 | * | |
609 | * Returns number of VFs belonging to this device that are assigned to a guest. | |
652d1100 | 610 | * If device is not a physical function returns 0. |
5a8eb242 AD |
611 | */ |
612 | int pci_vfs_assigned(struct pci_dev *dev) | |
613 | { | |
614 | struct pci_dev *vfdev; | |
615 | unsigned int vfs_assigned = 0; | |
616 | unsigned short dev_id; | |
617 | ||
618 | /* only search if we are a PF */ | |
619 | if (!dev->is_physfn) | |
620 | return 0; | |
621 | ||
622 | /* | |
623 | * determine the device ID for the VFs, the vendor ID will be the | |
624 | * same as the PF so there is no need to check for that one | |
625 | */ | |
626 | pci_read_config_word(dev, dev->sriov->pos + PCI_SRIOV_VF_DID, &dev_id); | |
627 | ||
628 | /* loop through all the VFs to see if we own any that are assigned */ | |
629 | vfdev = pci_get_device(dev->vendor, dev_id, NULL); | |
630 | while (vfdev) { | |
631 | /* | |
632 | * It is considered assigned if it is a virtual function with | |
633 | * our dev as the physical function and the assigned bit is set | |
634 | */ | |
635 | if (vfdev->is_virtfn && (vfdev->physfn == dev) && | |
be63497c | 636 | pci_is_dev_assigned(vfdev)) |
5a8eb242 AD |
637 | vfs_assigned++; |
638 | ||
639 | vfdev = pci_get_device(dev->vendor, dev_id, vfdev); | |
640 | } | |
641 | ||
642 | return vfs_assigned; | |
643 | } | |
644 | EXPORT_SYMBOL_GPL(pci_vfs_assigned); | |
645 | ||
bff73156 DD |
646 | /** |
647 | * pci_sriov_set_totalvfs -- reduce the TotalVFs available | |
648 | * @dev: the PCI PF device | |
2094f167 | 649 | * @numvfs: number that should be used for TotalVFs supported |
bff73156 DD |
650 | * |
651 | * Should be called from PF driver's probe routine with | |
652 | * device's mutex held. | |
653 | * | |
654 | * Returns 0 if PF is an SRIOV-capable device and | |
652d1100 SA |
655 | * value of numvfs valid. If not a PF return -ENOSYS; |
656 | * if numvfs is invalid return -EINVAL; | |
bff73156 DD |
657 | * if VFs already enabled, return -EBUSY. |
658 | */ | |
659 | int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs) | |
660 | { | |
652d1100 SA |
661 | if (!dev->is_physfn) |
662 | return -ENOSYS; | |
663 | if (numvfs > dev->sriov->total_VFs) | |
bff73156 DD |
664 | return -EINVAL; |
665 | ||
666 | /* Shouldn't change if VFs already enabled */ | |
667 | if (dev->sriov->ctrl & PCI_SRIOV_CTRL_VFE) | |
668 | return -EBUSY; | |
669 | else | |
6b136724 | 670 | dev->sriov->driver_max_VFs = numvfs; |
bff73156 DD |
671 | |
672 | return 0; | |
673 | } | |
674 | EXPORT_SYMBOL_GPL(pci_sriov_set_totalvfs); | |
675 | ||
676 | /** | |
ddc191f5 | 677 | * pci_sriov_get_totalvfs -- get total VFs supported on this device |
bff73156 DD |
678 | * @dev: the PCI PF device |
679 | * | |
680 | * For a PCIe device with SRIOV support, return the PCIe | |
6b136724 | 681 | * SRIOV capability value of TotalVFs or the value of driver_max_VFs |
652d1100 | 682 | * if the driver reduced it. Otherwise 0. |
bff73156 DD |
683 | */ |
684 | int pci_sriov_get_totalvfs(struct pci_dev *dev) | |
685 | { | |
1452cd76 | 686 | if (!dev->is_physfn) |
652d1100 | 687 | return 0; |
bff73156 | 688 | |
6b136724 BH |
689 | if (dev->sriov->driver_max_VFs) |
690 | return dev->sriov->driver_max_VFs; | |
1452cd76 BH |
691 | |
692 | return dev->sriov->total_VFs; | |
bff73156 DD |
693 | } |
694 | EXPORT_SYMBOL_GPL(pci_sriov_get_totalvfs); |