Commit | Line | Data |
---|---|---|
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 | ||
f59dca27 WY |
34 | /* |
35 | * Per SR-IOV spec sec 3.3.10 and 3.3.11, First VF Offset and VF Stride may | |
36 | * change when NumVFs changes. | |
37 | * | |
38 | * Update iov->offset and iov->stride when NumVFs is written. | |
39 | */ | |
40 | static inline void pci_iov_set_numvfs(struct pci_dev *dev, int nr_virtfn) | |
41 | { | |
42 | struct pci_sriov *iov = dev->sriov; | |
43 | ||
44 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, nr_virtfn); | |
45 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_OFFSET, &iov->offset); | |
46 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_STRIDE, &iov->stride); | |
47 | } | |
48 | ||
4449f079 WY |
49 | /* |
50 | * The PF consumes one bus number. NumVFs, First VF Offset, and VF Stride | |
51 | * determine how many additional bus numbers will be consumed by VFs. | |
52 | * | |
53 | * Iterate over all valid NumVFs and calculate the maximum number of bus | |
54 | * numbers that could ever be required. | |
55 | */ | |
56 | static inline u8 virtfn_max_buses(struct pci_dev *dev) | |
57 | { | |
58 | struct pci_sriov *iov = dev->sriov; | |
59 | int nr_virtfn; | |
60 | u8 max = 0; | |
61 | u8 busnr; | |
62 | ||
63 | for (nr_virtfn = 1; nr_virtfn <= iov->total_VFs; nr_virtfn++) { | |
64 | pci_iov_set_numvfs(dev, nr_virtfn); | |
65 | busnr = virtfn_bus(dev, nr_virtfn - 1); | |
66 | if (busnr > max) | |
67 | max = busnr; | |
68 | } | |
69 | ||
70 | return max; | |
71 | } | |
72 | ||
dd7cc44d YZ |
73 | static struct pci_bus *virtfn_add_bus(struct pci_bus *bus, int busnr) |
74 | { | |
dd7cc44d YZ |
75 | struct pci_bus *child; |
76 | ||
77 | if (bus->number == busnr) | |
78 | return bus; | |
79 | ||
80 | child = pci_find_bus(pci_domain_nr(bus), busnr); | |
81 | if (child) | |
82 | return child; | |
83 | ||
84 | child = pci_add_new_bus(bus, NULL, busnr); | |
85 | if (!child) | |
86 | return NULL; | |
87 | ||
b7eac055 | 88 | pci_bus_insert_busn_res(child, busnr, busnr); |
dd7cc44d YZ |
89 | |
90 | return child; | |
91 | } | |
92 | ||
dc087f2f | 93 | static void virtfn_remove_bus(struct pci_bus *physbus, struct pci_bus *virtbus) |
dd7cc44d | 94 | { |
dc087f2f JL |
95 | if (physbus != virtbus && list_empty(&virtbus->devices)) |
96 | pci_remove_bus(virtbus); | |
dd7cc44d YZ |
97 | } |
98 | ||
0e6c9122 WY |
99 | resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno) |
100 | { | |
101 | if (!dev->is_physfn) | |
102 | return 0; | |
103 | ||
104 | return dev->sriov->barsz[resno - PCI_IOV_RESOURCES]; | |
105 | } | |
106 | ||
dd7cc44d YZ |
107 | static int virtfn_add(struct pci_dev *dev, int id, int reset) |
108 | { | |
109 | int i; | |
dc087f2f | 110 | int rc = -ENOMEM; |
dd7cc44d YZ |
111 | u64 size; |
112 | char buf[VIRTFN_ID_LEN]; | |
113 | struct pci_dev *virtfn; | |
114 | struct resource *res; | |
115 | struct pci_sriov *iov = dev->sriov; | |
8b1fce04 | 116 | struct pci_bus *bus; |
dd7cc44d | 117 | |
dd7cc44d | 118 | mutex_lock(&iov->dev->sriov->lock); |
8b1fce04 | 119 | bus = virtfn_add_bus(dev->bus, virtfn_bus(dev, id)); |
dc087f2f JL |
120 | if (!bus) |
121 | goto failed; | |
122 | ||
123 | virtfn = pci_alloc_dev(bus); | |
dd7cc44d | 124 | if (!virtfn) |
dc087f2f | 125 | goto failed0; |
dd7cc44d | 126 | |
dd7cc44d YZ |
127 | virtfn->devfn = virtfn_devfn(dev, id); |
128 | virtfn->vendor = dev->vendor; | |
129 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_DID, &virtfn->device); | |
130 | pci_setup_device(virtfn); | |
131 | virtfn->dev.parent = dev->dev.parent; | |
fbf33f51 XH |
132 | virtfn->physfn = pci_dev_get(dev); |
133 | virtfn->is_virtfn = 1; | |
aa931977 | 134 | virtfn->multifunction = 0; |
dd7cc44d YZ |
135 | |
136 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { | |
c1fe1f96 | 137 | res = &dev->resource[i + PCI_IOV_RESOURCES]; |
dd7cc44d YZ |
138 | if (!res->parent) |
139 | continue; | |
140 | virtfn->resource[i].name = pci_name(virtfn); | |
141 | virtfn->resource[i].flags = res->flags; | |
0e6c9122 | 142 | size = pci_iov_resource_size(dev, i + PCI_IOV_RESOURCES); |
dd7cc44d YZ |
143 | virtfn->resource[i].start = res->start + size * id; |
144 | virtfn->resource[i].end = virtfn->resource[i].start + size - 1; | |
145 | rc = request_resource(res, &virtfn->resource[i]); | |
146 | BUG_ON(rc); | |
147 | } | |
148 | ||
149 | if (reset) | |
8c1c699f | 150 | __pci_reset_function(virtfn); |
dd7cc44d YZ |
151 | |
152 | pci_device_add(virtfn, virtfn->bus); | |
153 | mutex_unlock(&iov->dev->sriov->lock); | |
154 | ||
c893d133 | 155 | pci_bus_add_device(virtfn); |
dd7cc44d YZ |
156 | sprintf(buf, "virtfn%u", id); |
157 | rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf); | |
158 | if (rc) | |
159 | goto failed1; | |
160 | rc = sysfs_create_link(&virtfn->dev.kobj, &dev->dev.kobj, "physfn"); | |
161 | if (rc) | |
162 | goto failed2; | |
163 | ||
164 | kobject_uevent(&virtfn->dev.kobj, KOBJ_CHANGE); | |
165 | ||
166 | return 0; | |
167 | ||
168 | failed2: | |
169 | sysfs_remove_link(&dev->dev.kobj, buf); | |
170 | failed1: | |
171 | pci_dev_put(dev); | |
172 | mutex_lock(&iov->dev->sriov->lock); | |
210647af | 173 | pci_stop_and_remove_bus_device(virtfn); |
dc087f2f JL |
174 | failed0: |
175 | virtfn_remove_bus(dev->bus, bus); | |
176 | failed: | |
dd7cc44d YZ |
177 | mutex_unlock(&iov->dev->sriov->lock); |
178 | ||
179 | return rc; | |
180 | } | |
181 | ||
182 | static void virtfn_remove(struct pci_dev *dev, int id, int reset) | |
183 | { | |
184 | char buf[VIRTFN_ID_LEN]; | |
dd7cc44d YZ |
185 | struct pci_dev *virtfn; |
186 | struct pci_sriov *iov = dev->sriov; | |
187 | ||
dc087f2f JL |
188 | virtfn = pci_get_domain_bus_and_slot(pci_domain_nr(dev->bus), |
189 | virtfn_bus(dev, id), | |
190 | virtfn_devfn(dev, id)); | |
dd7cc44d YZ |
191 | if (!virtfn) |
192 | return; | |
193 | ||
dd7cc44d YZ |
194 | if (reset) { |
195 | device_release_driver(&virtfn->dev); | |
8c1c699f | 196 | __pci_reset_function(virtfn); |
dd7cc44d YZ |
197 | } |
198 | ||
199 | sprintf(buf, "virtfn%u", id); | |
200 | sysfs_remove_link(&dev->dev.kobj, buf); | |
09cedbef YL |
201 | /* |
202 | * pci_stop_dev() could have been called for this virtfn already, | |
203 | * so the directory for the virtfn may have been removed before. | |
204 | * Double check to avoid spurious sysfs warnings. | |
205 | */ | |
206 | if (virtfn->dev.kobj.sd) | |
207 | sysfs_remove_link(&virtfn->dev.kobj, "physfn"); | |
dd7cc44d YZ |
208 | |
209 | mutex_lock(&iov->dev->sriov->lock); | |
210647af | 210 | pci_stop_and_remove_bus_device(virtfn); |
dc087f2f | 211 | virtfn_remove_bus(dev->bus, virtfn->bus); |
dd7cc44d YZ |
212 | mutex_unlock(&iov->dev->sriov->lock); |
213 | ||
dc087f2f JL |
214 | /* balance pci_get_domain_bus_and_slot() */ |
215 | pci_dev_put(virtfn); | |
dd7cc44d YZ |
216 | pci_dev_put(dev); |
217 | } | |
218 | ||
219 | static int sriov_enable(struct pci_dev *dev, int nr_virtfn) | |
220 | { | |
221 | int rc; | |
222 | int i, j; | |
223 | int nres; | |
224 | u16 offset, stride, initial; | |
225 | struct resource *res; | |
226 | struct pci_dev *pdev; | |
227 | struct pci_sriov *iov = dev->sriov; | |
bbef98ab | 228 | int bars = 0; |
68f8e9fa | 229 | u8 bus; |
dd7cc44d YZ |
230 | |
231 | if (!nr_virtfn) | |
232 | return 0; | |
233 | ||
6b136724 | 234 | if (iov->num_VFs) |
dd7cc44d YZ |
235 | return -EINVAL; |
236 | ||
237 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_INITIAL_VF, &initial); | |
6b136724 BH |
238 | if (initial > iov->total_VFs || |
239 | (!(iov->cap & PCI_SRIOV_CAP_VFM) && (initial != iov->total_VFs))) | |
dd7cc44d YZ |
240 | return -EIO; |
241 | ||
6b136724 | 242 | if (nr_virtfn < 0 || nr_virtfn > iov->total_VFs || |
dd7cc44d YZ |
243 | (!(iov->cap & PCI_SRIOV_CAP_VFM) && (nr_virtfn > initial))) |
244 | return -EINVAL; | |
245 | ||
dd7cc44d YZ |
246 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_OFFSET, &offset); |
247 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_STRIDE, &stride); | |
248 | if (!offset || (nr_virtfn > 1 && !stride)) | |
249 | return -EIO; | |
250 | ||
251 | nres = 0; | |
252 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { | |
bbef98ab | 253 | bars |= (1 << (i + PCI_IOV_RESOURCES)); |
c1fe1f96 | 254 | res = &dev->resource[i + PCI_IOV_RESOURCES]; |
dd7cc44d YZ |
255 | if (res->parent) |
256 | nres++; | |
257 | } | |
258 | if (nres != iov->nres) { | |
259 | dev_err(&dev->dev, "not enough MMIO resources for SR-IOV\n"); | |
260 | return -ENOMEM; | |
261 | } | |
262 | ||
263 | iov->offset = offset; | |
264 | iov->stride = stride; | |
265 | ||
68f8e9fa BH |
266 | bus = virtfn_bus(dev, nr_virtfn - 1); |
267 | if (bus > dev->bus->busn_res.end) { | |
268 | dev_err(&dev->dev, "can't enable %d VFs (bus %02x out of range of %pR)\n", | |
269 | nr_virtfn, bus, &dev->bus->busn_res); | |
dd7cc44d YZ |
270 | return -ENOMEM; |
271 | } | |
272 | ||
bbef98ab RP |
273 | if (pci_enable_resources(dev, bars)) { |
274 | dev_err(&dev->dev, "SR-IOV: IOV BARS not allocated\n"); | |
275 | return -ENOMEM; | |
276 | } | |
277 | ||
dd7cc44d YZ |
278 | if (iov->link != dev->devfn) { |
279 | pdev = pci_get_slot(dev->bus, iov->link); | |
280 | if (!pdev) | |
281 | return -ENODEV; | |
282 | ||
dc087f2f JL |
283 | if (!pdev->is_physfn) { |
284 | pci_dev_put(pdev); | |
652d1100 | 285 | return -ENOSYS; |
dc087f2f | 286 | } |
dd7cc44d YZ |
287 | |
288 | rc = sysfs_create_link(&dev->dev.kobj, | |
289 | &pdev->dev.kobj, "dep_link"); | |
dc087f2f | 290 | pci_dev_put(pdev); |
dd7cc44d YZ |
291 | if (rc) |
292 | return rc; | |
293 | } | |
294 | ||
f59dca27 | 295 | pci_iov_set_numvfs(dev, nr_virtfn); |
dd7cc44d | 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 | msleep(100); | |
fb51ccbf | 300 | pci_cfg_access_unlock(dev); |
dd7cc44d | 301 | |
6b136724 | 302 | iov->initial_VFs = initial; |
dd7cc44d YZ |
303 | if (nr_virtfn < initial) |
304 | initial = nr_virtfn; | |
305 | ||
306 | for (i = 0; i < initial; i++) { | |
307 | rc = virtfn_add(dev, i, 0); | |
308 | if (rc) | |
309 | goto failed; | |
310 | } | |
311 | ||
312 | kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE); | |
6b136724 | 313 | iov->num_VFs = nr_virtfn; |
dd7cc44d YZ |
314 | |
315 | return 0; | |
316 | ||
317 | failed: | |
318 | for (j = 0; j < i; j++) | |
319 | virtfn_remove(dev, j, 0); | |
320 | ||
321 | iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE); | |
fb51ccbf | 322 | pci_cfg_access_lock(dev); |
dd7cc44d | 323 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); |
f59dca27 | 324 | pci_iov_set_numvfs(dev, 0); |
dd7cc44d | 325 | ssleep(1); |
fb51ccbf | 326 | pci_cfg_access_unlock(dev); |
dd7cc44d YZ |
327 | |
328 | if (iov->link != dev->devfn) | |
329 | sysfs_remove_link(&dev->dev.kobj, "dep_link"); | |
330 | ||
331 | return rc; | |
332 | } | |
333 | ||
334 | static void sriov_disable(struct pci_dev *dev) | |
335 | { | |
336 | int i; | |
337 | struct pci_sriov *iov = dev->sriov; | |
338 | ||
6b136724 | 339 | if (!iov->num_VFs) |
dd7cc44d YZ |
340 | return; |
341 | ||
6b136724 | 342 | for (i = 0; i < iov->num_VFs; i++) |
dd7cc44d YZ |
343 | virtfn_remove(dev, i, 0); |
344 | ||
345 | iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE); | |
fb51ccbf | 346 | pci_cfg_access_lock(dev); |
dd7cc44d YZ |
347 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); |
348 | ssleep(1); | |
fb51ccbf | 349 | pci_cfg_access_unlock(dev); |
dd7cc44d YZ |
350 | |
351 | if (iov->link != dev->devfn) | |
352 | sysfs_remove_link(&dev->dev.kobj, "dep_link"); | |
353 | ||
6b136724 | 354 | iov->num_VFs = 0; |
f59dca27 | 355 | pci_iov_set_numvfs(dev, 0); |
dd7cc44d YZ |
356 | } |
357 | ||
d1b054da YZ |
358 | static int sriov_init(struct pci_dev *dev, int pos) |
359 | { | |
0e6c9122 | 360 | int i, bar64; |
d1b054da YZ |
361 | int rc; |
362 | int nres; | |
363 | u32 pgsz; | |
364 | u16 ctrl, total, offset, stride; | |
365 | struct pci_sriov *iov; | |
366 | struct resource *res; | |
367 | struct pci_dev *pdev; | |
368 | ||
62f87c0e YW |
369 | if (pci_pcie_type(dev) != PCI_EXP_TYPE_RC_END && |
370 | pci_pcie_type(dev) != PCI_EXP_TYPE_ENDPOINT) | |
d1b054da YZ |
371 | return -ENODEV; |
372 | ||
373 | pci_read_config_word(dev, pos + PCI_SRIOV_CTRL, &ctrl); | |
374 | if (ctrl & PCI_SRIOV_CTRL_VFE) { | |
375 | pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, 0); | |
376 | ssleep(1); | |
377 | } | |
378 | ||
379 | pci_read_config_word(dev, pos + PCI_SRIOV_TOTAL_VF, &total); | |
380 | if (!total) | |
381 | return 0; | |
382 | ||
383 | ctrl = 0; | |
384 | list_for_each_entry(pdev, &dev->bus->devices, bus_list) | |
385 | if (pdev->is_physfn) | |
386 | goto found; | |
387 | ||
388 | pdev = NULL; | |
389 | if (pci_ari_enabled(dev->bus)) | |
390 | ctrl |= PCI_SRIOV_CTRL_ARI; | |
391 | ||
392 | found: | |
393 | pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, ctrl); | |
045cc22e | 394 | pci_write_config_word(dev, pos + PCI_SRIOV_NUM_VF, 0); |
d1b054da YZ |
395 | pci_read_config_word(dev, pos + PCI_SRIOV_VF_OFFSET, &offset); |
396 | pci_read_config_word(dev, pos + PCI_SRIOV_VF_STRIDE, &stride); | |
397 | if (!offset || (total > 1 && !stride)) | |
398 | return -EIO; | |
399 | ||
400 | pci_read_config_dword(dev, pos + PCI_SRIOV_SUP_PGSIZE, &pgsz); | |
401 | i = PAGE_SHIFT > 12 ? PAGE_SHIFT - 12 : 0; | |
402 | pgsz &= ~((1 << i) - 1); | |
403 | if (!pgsz) | |
404 | return -EIO; | |
405 | ||
406 | pgsz &= ~(pgsz - 1); | |
8161fe91 | 407 | pci_write_config_dword(dev, pos + PCI_SRIOV_SYS_PGSIZE, pgsz); |
d1b054da | 408 | |
0e6c9122 WY |
409 | iov = kzalloc(sizeof(*iov), GFP_KERNEL); |
410 | if (!iov) | |
411 | return -ENOMEM; | |
412 | ||
d1b054da YZ |
413 | nres = 0; |
414 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { | |
c1fe1f96 | 415 | res = &dev->resource[i + PCI_IOV_RESOURCES]; |
0e6c9122 WY |
416 | bar64 = __pci_read_base(dev, pci_bar_unknown, res, |
417 | pos + PCI_SRIOV_BAR + i * 4); | |
d1b054da YZ |
418 | if (!res->flags) |
419 | continue; | |
420 | if (resource_size(res) & (PAGE_SIZE - 1)) { | |
421 | rc = -EIO; | |
422 | goto failed; | |
423 | } | |
0e6c9122 | 424 | iov->barsz[i] = resource_size(res); |
d1b054da | 425 | res->end = res->start + resource_size(res) * total - 1; |
e88ae01d WY |
426 | dev_info(&dev->dev, "VF(n) BAR%d space: %pR (contains BAR%d for %d VFs)\n", |
427 | i, res, i, total); | |
0e6c9122 | 428 | i += bar64; |
d1b054da YZ |
429 | nres++; |
430 | } | |
431 | ||
d1b054da YZ |
432 | iov->pos = pos; |
433 | iov->nres = nres; | |
434 | iov->ctrl = ctrl; | |
6b136724 | 435 | iov->total_VFs = total; |
d1b054da YZ |
436 | iov->offset = offset; |
437 | iov->stride = stride; | |
438 | iov->pgsz = pgsz; | |
439 | iov->self = dev; | |
440 | pci_read_config_dword(dev, pos + PCI_SRIOV_CAP, &iov->cap); | |
441 | pci_read_config_byte(dev, pos + PCI_SRIOV_FUNC_LINK, &iov->link); | |
62f87c0e | 442 | if (pci_pcie_type(dev) == PCI_EXP_TYPE_RC_END) |
4d135dbe | 443 | iov->link = PCI_DEVFN(PCI_SLOT(dev->devfn), iov->link); |
d1b054da YZ |
444 | |
445 | if (pdev) | |
446 | iov->dev = pci_dev_get(pdev); | |
e277d2fc | 447 | else |
d1b054da | 448 | iov->dev = dev; |
e277d2fc YZ |
449 | |
450 | mutex_init(&iov->lock); | |
d1b054da YZ |
451 | |
452 | dev->sriov = iov; | |
453 | dev->is_physfn = 1; | |
4449f079 | 454 | iov->max_VF_buses = virtfn_max_buses(dev); |
d1b054da YZ |
455 | |
456 | return 0; | |
457 | ||
458 | failed: | |
459 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { | |
c1fe1f96 | 460 | res = &dev->resource[i + PCI_IOV_RESOURCES]; |
d1b054da YZ |
461 | res->flags = 0; |
462 | } | |
463 | ||
0e6c9122 | 464 | kfree(iov); |
d1b054da YZ |
465 | return rc; |
466 | } | |
467 | ||
468 | static void sriov_release(struct pci_dev *dev) | |
469 | { | |
6b136724 | 470 | BUG_ON(dev->sriov->num_VFs); |
dd7cc44d | 471 | |
e277d2fc | 472 | if (dev != dev->sriov->dev) |
d1b054da YZ |
473 | pci_dev_put(dev->sriov->dev); |
474 | ||
e277d2fc YZ |
475 | mutex_destroy(&dev->sriov->lock); |
476 | ||
d1b054da YZ |
477 | kfree(dev->sriov); |
478 | dev->sriov = NULL; | |
479 | } | |
480 | ||
8c5cdb6a YZ |
481 | static void sriov_restore_state(struct pci_dev *dev) |
482 | { | |
483 | int i; | |
484 | u16 ctrl; | |
485 | struct pci_sriov *iov = dev->sriov; | |
486 | ||
487 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_CTRL, &ctrl); | |
488 | if (ctrl & PCI_SRIOV_CTRL_VFE) | |
489 | return; | |
490 | ||
491 | for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) | |
492 | pci_update_resource(dev, i); | |
493 | ||
494 | pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz); | |
f59dca27 | 495 | pci_iov_set_numvfs(dev, iov->num_VFs); |
8c5cdb6a YZ |
496 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); |
497 | if (iov->ctrl & PCI_SRIOV_CTRL_VFE) | |
498 | msleep(100); | |
499 | } | |
500 | ||
d1b054da YZ |
501 | /** |
502 | * pci_iov_init - initialize the IOV capability | |
503 | * @dev: the PCI device | |
504 | * | |
505 | * Returns 0 on success, or negative on failure. | |
506 | */ | |
507 | int pci_iov_init(struct pci_dev *dev) | |
508 | { | |
509 | int pos; | |
510 | ||
5f4d91a1 | 511 | if (!pci_is_pcie(dev)) |
d1b054da YZ |
512 | return -ENODEV; |
513 | ||
514 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV); | |
515 | if (pos) | |
516 | return sriov_init(dev, pos); | |
517 | ||
518 | return -ENODEV; | |
519 | } | |
520 | ||
521 | /** | |
522 | * pci_iov_release - release resources used by the IOV capability | |
523 | * @dev: the PCI device | |
524 | */ | |
525 | void pci_iov_release(struct pci_dev *dev) | |
526 | { | |
527 | if (dev->is_physfn) | |
528 | sriov_release(dev); | |
529 | } | |
530 | ||
531 | /** | |
532 | * pci_iov_resource_bar - get position of the SR-IOV BAR | |
533 | * @dev: the PCI device | |
534 | * @resno: the resource number | |
d1b054da YZ |
535 | * |
536 | * Returns position of the BAR encapsulated in the SR-IOV capability. | |
537 | */ | |
26ff46c6 | 538 | int pci_iov_resource_bar(struct pci_dev *dev, int resno) |
d1b054da YZ |
539 | { |
540 | if (resno < PCI_IOV_RESOURCES || resno > PCI_IOV_RESOURCE_END) | |
541 | return 0; | |
542 | ||
543 | BUG_ON(!dev->is_physfn); | |
544 | ||
d1b054da YZ |
545 | return dev->sriov->pos + PCI_SRIOV_BAR + |
546 | 4 * (resno - PCI_IOV_RESOURCES); | |
547 | } | |
8c5cdb6a | 548 | |
6faf17f6 CW |
549 | /** |
550 | * pci_sriov_resource_alignment - get resource alignment for VF BAR | |
551 | * @dev: the PCI device | |
552 | * @resno: the resource number | |
553 | * | |
554 | * Returns the alignment of the VF BAR found in the SR-IOV capability. | |
555 | * This is not the same as the resource size which is defined as | |
556 | * the VF BAR size multiplied by the number of VFs. The alignment | |
557 | * is just the VF BAR size. | |
558 | */ | |
0e52247a | 559 | resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno) |
6faf17f6 | 560 | { |
0e6c9122 | 561 | return pci_iov_resource_size(dev, resno); |
6faf17f6 CW |
562 | } |
563 | ||
8c5cdb6a YZ |
564 | /** |
565 | * pci_restore_iov_state - restore the state of the IOV capability | |
566 | * @dev: the PCI device | |
567 | */ | |
568 | void pci_restore_iov_state(struct pci_dev *dev) | |
569 | { | |
570 | if (dev->is_physfn) | |
571 | sriov_restore_state(dev); | |
572 | } | |
a28724b0 YZ |
573 | |
574 | /** | |
575 | * pci_iov_bus_range - find bus range used by Virtual Function | |
576 | * @bus: the PCI bus | |
577 | * | |
578 | * Returns max number of buses (exclude current one) used by Virtual | |
579 | * Functions. | |
580 | */ | |
581 | int pci_iov_bus_range(struct pci_bus *bus) | |
582 | { | |
583 | int max = 0; | |
a28724b0 YZ |
584 | struct pci_dev *dev; |
585 | ||
586 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
587 | if (!dev->is_physfn) | |
588 | continue; | |
4449f079 WY |
589 | if (dev->sriov->max_VF_buses > max) |
590 | max = dev->sriov->max_VF_buses; | |
a28724b0 YZ |
591 | } |
592 | ||
593 | return max ? max - bus->number : 0; | |
594 | } | |
dd7cc44d YZ |
595 | |
596 | /** | |
597 | * pci_enable_sriov - enable the SR-IOV capability | |
598 | * @dev: the PCI device | |
52a8873b | 599 | * @nr_virtfn: number of virtual functions to enable |
dd7cc44d YZ |
600 | * |
601 | * Returns 0 on success, or negative on failure. | |
602 | */ | |
603 | int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn) | |
604 | { | |
605 | might_sleep(); | |
606 | ||
607 | if (!dev->is_physfn) | |
652d1100 | 608 | return -ENOSYS; |
dd7cc44d YZ |
609 | |
610 | return sriov_enable(dev, nr_virtfn); | |
611 | } | |
612 | EXPORT_SYMBOL_GPL(pci_enable_sriov); | |
613 | ||
614 | /** | |
615 | * pci_disable_sriov - disable the SR-IOV capability | |
616 | * @dev: the PCI device | |
617 | */ | |
618 | void pci_disable_sriov(struct pci_dev *dev) | |
619 | { | |
620 | might_sleep(); | |
621 | ||
622 | if (!dev->is_physfn) | |
623 | return; | |
624 | ||
625 | sriov_disable(dev); | |
626 | } | |
627 | EXPORT_SYMBOL_GPL(pci_disable_sriov); | |
74bb1bcc | 628 | |
fb8a0d9d WM |
629 | /** |
630 | * pci_num_vf - return number of VFs associated with a PF device_release_driver | |
631 | * @dev: the PCI device | |
632 | * | |
633 | * Returns number of VFs, or 0 if SR-IOV is not enabled. | |
634 | */ | |
635 | int pci_num_vf(struct pci_dev *dev) | |
636 | { | |
1452cd76 | 637 | if (!dev->is_physfn) |
fb8a0d9d | 638 | return 0; |
1452cd76 BH |
639 | |
640 | return dev->sriov->num_VFs; | |
fb8a0d9d WM |
641 | } |
642 | EXPORT_SYMBOL_GPL(pci_num_vf); | |
bff73156 | 643 | |
5a8eb242 AD |
644 | /** |
645 | * pci_vfs_assigned - returns number of VFs are assigned to a guest | |
646 | * @dev: the PCI device | |
647 | * | |
648 | * Returns number of VFs belonging to this device that are assigned to a guest. | |
652d1100 | 649 | * If device is not a physical function returns 0. |
5a8eb242 AD |
650 | */ |
651 | int pci_vfs_assigned(struct pci_dev *dev) | |
652 | { | |
653 | struct pci_dev *vfdev; | |
654 | unsigned int vfs_assigned = 0; | |
655 | unsigned short dev_id; | |
656 | ||
657 | /* only search if we are a PF */ | |
658 | if (!dev->is_physfn) | |
659 | return 0; | |
660 | ||
661 | /* | |
662 | * determine the device ID for the VFs, the vendor ID will be the | |
663 | * same as the PF so there is no need to check for that one | |
664 | */ | |
665 | pci_read_config_word(dev, dev->sriov->pos + PCI_SRIOV_VF_DID, &dev_id); | |
666 | ||
667 | /* loop through all the VFs to see if we own any that are assigned */ | |
668 | vfdev = pci_get_device(dev->vendor, dev_id, NULL); | |
669 | while (vfdev) { | |
670 | /* | |
671 | * It is considered assigned if it is a virtual function with | |
672 | * our dev as the physical function and the assigned bit is set | |
673 | */ | |
674 | if (vfdev->is_virtfn && (vfdev->physfn == dev) && | |
be63497c | 675 | pci_is_dev_assigned(vfdev)) |
5a8eb242 AD |
676 | vfs_assigned++; |
677 | ||
678 | vfdev = pci_get_device(dev->vendor, dev_id, vfdev); | |
679 | } | |
680 | ||
681 | return vfs_assigned; | |
682 | } | |
683 | EXPORT_SYMBOL_GPL(pci_vfs_assigned); | |
684 | ||
bff73156 DD |
685 | /** |
686 | * pci_sriov_set_totalvfs -- reduce the TotalVFs available | |
687 | * @dev: the PCI PF device | |
2094f167 | 688 | * @numvfs: number that should be used for TotalVFs supported |
bff73156 DD |
689 | * |
690 | * Should be called from PF driver's probe routine with | |
691 | * device's mutex held. | |
692 | * | |
693 | * Returns 0 if PF is an SRIOV-capable device and | |
652d1100 SA |
694 | * value of numvfs valid. If not a PF return -ENOSYS; |
695 | * if numvfs is invalid return -EINVAL; | |
bff73156 DD |
696 | * if VFs already enabled, return -EBUSY. |
697 | */ | |
698 | int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs) | |
699 | { | |
652d1100 SA |
700 | if (!dev->is_physfn) |
701 | return -ENOSYS; | |
702 | if (numvfs > dev->sriov->total_VFs) | |
bff73156 DD |
703 | return -EINVAL; |
704 | ||
705 | /* Shouldn't change if VFs already enabled */ | |
706 | if (dev->sriov->ctrl & PCI_SRIOV_CTRL_VFE) | |
707 | return -EBUSY; | |
708 | else | |
6b136724 | 709 | dev->sriov->driver_max_VFs = numvfs; |
bff73156 DD |
710 | |
711 | return 0; | |
712 | } | |
713 | EXPORT_SYMBOL_GPL(pci_sriov_set_totalvfs); | |
714 | ||
715 | /** | |
ddc191f5 | 716 | * pci_sriov_get_totalvfs -- get total VFs supported on this device |
bff73156 DD |
717 | * @dev: the PCI PF device |
718 | * | |
719 | * For a PCIe device with SRIOV support, return the PCIe | |
6b136724 | 720 | * SRIOV capability value of TotalVFs or the value of driver_max_VFs |
652d1100 | 721 | * if the driver reduced it. Otherwise 0. |
bff73156 DD |
722 | */ |
723 | int pci_sriov_get_totalvfs(struct pci_dev *dev) | |
724 | { | |
1452cd76 | 725 | if (!dev->is_physfn) |
652d1100 | 726 | return 0; |
bff73156 | 727 | |
6b136724 BH |
728 | if (dev->sriov->driver_max_VFs) |
729 | return dev->sriov->driver_max_VFs; | |
1452cd76 BH |
730 | |
731 | return dev->sriov->total_VFs; | |
bff73156 DD |
732 | } |
733 | EXPORT_SYMBOL_GPL(pci_sriov_get_totalvfs); |