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 | |
b07579c0 | 22 | int pci_iov_virtfn_bus(struct pci_dev *dev, int vf_id) |
a28724b0 | 23 | { |
b07579c0 WY |
24 | if (!dev->is_physfn) |
25 | return -EINVAL; | |
a28724b0 | 26 | return dev->bus->number + ((dev->devfn + dev->sriov->offset + |
b07579c0 | 27 | dev->sriov->stride * vf_id) >> 8); |
a28724b0 YZ |
28 | } |
29 | ||
b07579c0 | 30 | int pci_iov_virtfn_devfn(struct pci_dev *dev, int vf_id) |
a28724b0 | 31 | { |
b07579c0 WY |
32 | if (!dev->is_physfn) |
33 | return -EINVAL; | |
a28724b0 | 34 | return (dev->devfn + dev->sriov->offset + |
b07579c0 | 35 | dev->sriov->stride * vf_id) & 0xff; |
a28724b0 YZ |
36 | } |
37 | ||
f59dca27 WY |
38 | /* |
39 | * Per SR-IOV spec sec 3.3.10 and 3.3.11, First VF Offset and VF Stride may | |
40 | * change when NumVFs changes. | |
41 | * | |
42 | * Update iov->offset and iov->stride when NumVFs is written. | |
43 | */ | |
44 | static inline void pci_iov_set_numvfs(struct pci_dev *dev, int nr_virtfn) | |
45 | { | |
46 | struct pci_sriov *iov = dev->sriov; | |
47 | ||
48 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, nr_virtfn); | |
49 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_OFFSET, &iov->offset); | |
50 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_STRIDE, &iov->stride); | |
51 | } | |
52 | ||
4449f079 WY |
53 | /* |
54 | * The PF consumes one bus number. NumVFs, First VF Offset, and VF Stride | |
55 | * determine how many additional bus numbers will be consumed by VFs. | |
56 | * | |
ea9a8854 AD |
57 | * Iterate over all valid NumVFs, validate offset and stride, and calculate |
58 | * the maximum number of bus numbers that could ever be required. | |
4449f079 | 59 | */ |
ea9a8854 | 60 | static int compute_max_vf_buses(struct pci_dev *dev) |
4449f079 WY |
61 | { |
62 | struct pci_sriov *iov = dev->sriov; | |
ea9a8854 | 63 | int nr_virtfn, busnr, rc = 0; |
4449f079 | 64 | |
ea9a8854 | 65 | for (nr_virtfn = iov->total_VFs; nr_virtfn; nr_virtfn--) { |
4449f079 | 66 | pci_iov_set_numvfs(dev, nr_virtfn); |
ea9a8854 AD |
67 | if (!iov->offset || (nr_virtfn > 1 && !iov->stride)) { |
68 | rc = -EIO; | |
69 | goto out; | |
70 | } | |
71 | ||
b07579c0 | 72 | busnr = pci_iov_virtfn_bus(dev, nr_virtfn - 1); |
ea9a8854 AD |
73 | if (busnr > iov->max_VF_buses) |
74 | iov->max_VF_buses = busnr; | |
4449f079 WY |
75 | } |
76 | ||
ea9a8854 AD |
77 | out: |
78 | pci_iov_set_numvfs(dev, 0); | |
79 | return rc; | |
4449f079 WY |
80 | } |
81 | ||
dd7cc44d YZ |
82 | static struct pci_bus *virtfn_add_bus(struct pci_bus *bus, int busnr) |
83 | { | |
dd7cc44d YZ |
84 | struct pci_bus *child; |
85 | ||
86 | if (bus->number == busnr) | |
87 | return bus; | |
88 | ||
89 | child = pci_find_bus(pci_domain_nr(bus), busnr); | |
90 | if (child) | |
91 | return child; | |
92 | ||
93 | child = pci_add_new_bus(bus, NULL, busnr); | |
94 | if (!child) | |
95 | return NULL; | |
96 | ||
b7eac055 | 97 | pci_bus_insert_busn_res(child, busnr, busnr); |
dd7cc44d YZ |
98 | |
99 | return child; | |
100 | } | |
101 | ||
dc087f2f | 102 | static void virtfn_remove_bus(struct pci_bus *physbus, struct pci_bus *virtbus) |
dd7cc44d | 103 | { |
dc087f2f JL |
104 | if (physbus != virtbus && list_empty(&virtbus->devices)) |
105 | pci_remove_bus(virtbus); | |
dd7cc44d YZ |
106 | } |
107 | ||
0e6c9122 WY |
108 | resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno) |
109 | { | |
110 | if (!dev->is_physfn) | |
111 | return 0; | |
112 | ||
113 | return dev->sriov->barsz[resno - PCI_IOV_RESOURCES]; | |
114 | } | |
115 | ||
c194f7ea | 116 | int pci_iov_add_virtfn(struct pci_dev *dev, int id, int reset) |
dd7cc44d YZ |
117 | { |
118 | int i; | |
dc087f2f | 119 | int rc = -ENOMEM; |
dd7cc44d YZ |
120 | u64 size; |
121 | char buf[VIRTFN_ID_LEN]; | |
122 | struct pci_dev *virtfn; | |
123 | struct resource *res; | |
124 | struct pci_sriov *iov = dev->sriov; | |
8b1fce04 | 125 | struct pci_bus *bus; |
dd7cc44d | 126 | |
dd7cc44d | 127 | mutex_lock(&iov->dev->sriov->lock); |
b07579c0 | 128 | bus = virtfn_add_bus(dev->bus, pci_iov_virtfn_bus(dev, id)); |
dc087f2f JL |
129 | if (!bus) |
130 | goto failed; | |
131 | ||
132 | virtfn = pci_alloc_dev(bus); | |
dd7cc44d | 133 | if (!virtfn) |
dc087f2f | 134 | goto failed0; |
dd7cc44d | 135 | |
b07579c0 | 136 | virtfn->devfn = pci_iov_virtfn_devfn(dev, id); |
dd7cc44d YZ |
137 | virtfn->vendor = dev->vendor; |
138 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_DID, &virtfn->device); | |
139 | pci_setup_device(virtfn); | |
140 | virtfn->dev.parent = dev->dev.parent; | |
fbf33f51 XH |
141 | virtfn->physfn = pci_dev_get(dev); |
142 | virtfn->is_virtfn = 1; | |
aa931977 | 143 | virtfn->multifunction = 0; |
dd7cc44d YZ |
144 | |
145 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { | |
c1fe1f96 | 146 | res = &dev->resource[i + PCI_IOV_RESOURCES]; |
dd7cc44d YZ |
147 | if (!res->parent) |
148 | continue; | |
149 | virtfn->resource[i].name = pci_name(virtfn); | |
150 | virtfn->resource[i].flags = res->flags; | |
0e6c9122 | 151 | size = pci_iov_resource_size(dev, i + PCI_IOV_RESOURCES); |
dd7cc44d YZ |
152 | virtfn->resource[i].start = res->start + size * id; |
153 | virtfn->resource[i].end = virtfn->resource[i].start + size - 1; | |
154 | rc = request_resource(res, &virtfn->resource[i]); | |
155 | BUG_ON(rc); | |
156 | } | |
157 | ||
158 | if (reset) | |
8c1c699f | 159 | __pci_reset_function(virtfn); |
dd7cc44d YZ |
160 | |
161 | pci_device_add(virtfn, virtfn->bus); | |
162 | mutex_unlock(&iov->dev->sriov->lock); | |
163 | ||
c893d133 | 164 | pci_bus_add_device(virtfn); |
dd7cc44d YZ |
165 | sprintf(buf, "virtfn%u", id); |
166 | rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf); | |
167 | if (rc) | |
168 | goto failed1; | |
169 | rc = sysfs_create_link(&virtfn->dev.kobj, &dev->dev.kobj, "physfn"); | |
170 | if (rc) | |
171 | goto failed2; | |
172 | ||
173 | kobject_uevent(&virtfn->dev.kobj, KOBJ_CHANGE); | |
174 | ||
175 | return 0; | |
176 | ||
177 | failed2: | |
178 | sysfs_remove_link(&dev->dev.kobj, buf); | |
179 | failed1: | |
180 | pci_dev_put(dev); | |
181 | mutex_lock(&iov->dev->sriov->lock); | |
210647af | 182 | pci_stop_and_remove_bus_device(virtfn); |
dc087f2f JL |
183 | failed0: |
184 | virtfn_remove_bus(dev->bus, bus); | |
185 | failed: | |
dd7cc44d YZ |
186 | mutex_unlock(&iov->dev->sriov->lock); |
187 | ||
188 | return rc; | |
189 | } | |
190 | ||
c194f7ea | 191 | void pci_iov_remove_virtfn(struct pci_dev *dev, int id, int reset) |
dd7cc44d YZ |
192 | { |
193 | char buf[VIRTFN_ID_LEN]; | |
dd7cc44d YZ |
194 | struct pci_dev *virtfn; |
195 | struct pci_sriov *iov = dev->sriov; | |
196 | ||
dc087f2f | 197 | virtfn = pci_get_domain_bus_and_slot(pci_domain_nr(dev->bus), |
b07579c0 WY |
198 | pci_iov_virtfn_bus(dev, id), |
199 | pci_iov_virtfn_devfn(dev, id)); | |
dd7cc44d YZ |
200 | if (!virtfn) |
201 | return; | |
202 | ||
dd7cc44d YZ |
203 | if (reset) { |
204 | device_release_driver(&virtfn->dev); | |
8c1c699f | 205 | __pci_reset_function(virtfn); |
dd7cc44d YZ |
206 | } |
207 | ||
208 | sprintf(buf, "virtfn%u", id); | |
209 | sysfs_remove_link(&dev->dev.kobj, buf); | |
09cedbef YL |
210 | /* |
211 | * pci_stop_dev() could have been called for this virtfn already, | |
212 | * so the directory for the virtfn may have been removed before. | |
213 | * Double check to avoid spurious sysfs warnings. | |
214 | */ | |
215 | if (virtfn->dev.kobj.sd) | |
216 | sysfs_remove_link(&virtfn->dev.kobj, "physfn"); | |
dd7cc44d YZ |
217 | |
218 | mutex_lock(&iov->dev->sriov->lock); | |
210647af | 219 | pci_stop_and_remove_bus_device(virtfn); |
dc087f2f | 220 | virtfn_remove_bus(dev->bus, virtfn->bus); |
dd7cc44d YZ |
221 | mutex_unlock(&iov->dev->sriov->lock); |
222 | ||
dc087f2f JL |
223 | /* balance pci_get_domain_bus_and_slot() */ |
224 | pci_dev_put(virtfn); | |
dd7cc44d YZ |
225 | pci_dev_put(dev); |
226 | } | |
227 | ||
995df527 WY |
228 | int __weak pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs) |
229 | { | |
a39e3fcd AD |
230 | return 0; |
231 | } | |
232 | ||
233 | int __weak pcibios_sriov_disable(struct pci_dev *pdev) | |
234 | { | |
235 | return 0; | |
995df527 WY |
236 | } |
237 | ||
dd7cc44d YZ |
238 | static int sriov_enable(struct pci_dev *dev, int nr_virtfn) |
239 | { | |
240 | int rc; | |
3443c382 | 241 | int i; |
dd7cc44d | 242 | int nres; |
ce288ec3 | 243 | u16 initial; |
dd7cc44d YZ |
244 | struct resource *res; |
245 | struct pci_dev *pdev; | |
246 | struct pci_sriov *iov = dev->sriov; | |
bbef98ab | 247 | int bars = 0; |
b07579c0 | 248 | int bus; |
dd7cc44d YZ |
249 | |
250 | if (!nr_virtfn) | |
251 | return 0; | |
252 | ||
6b136724 | 253 | if (iov->num_VFs) |
dd7cc44d YZ |
254 | return -EINVAL; |
255 | ||
256 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_INITIAL_VF, &initial); | |
6b136724 BH |
257 | if (initial > iov->total_VFs || |
258 | (!(iov->cap & PCI_SRIOV_CAP_VFM) && (initial != iov->total_VFs))) | |
dd7cc44d YZ |
259 | return -EIO; |
260 | ||
6b136724 | 261 | if (nr_virtfn < 0 || nr_virtfn > iov->total_VFs || |
dd7cc44d YZ |
262 | (!(iov->cap & PCI_SRIOV_CAP_VFM) && (nr_virtfn > initial))) |
263 | return -EINVAL; | |
264 | ||
dd7cc44d YZ |
265 | nres = 0; |
266 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { | |
bbef98ab | 267 | bars |= (1 << (i + PCI_IOV_RESOURCES)); |
c1fe1f96 | 268 | res = &dev->resource[i + PCI_IOV_RESOURCES]; |
dd7cc44d YZ |
269 | if (res->parent) |
270 | nres++; | |
271 | } | |
272 | if (nres != iov->nres) { | |
273 | dev_err(&dev->dev, "not enough MMIO resources for SR-IOV\n"); | |
274 | return -ENOMEM; | |
275 | } | |
276 | ||
b07579c0 | 277 | bus = pci_iov_virtfn_bus(dev, nr_virtfn - 1); |
68f8e9fa BH |
278 | if (bus > dev->bus->busn_res.end) { |
279 | dev_err(&dev->dev, "can't enable %d VFs (bus %02x out of range of %pR)\n", | |
280 | nr_virtfn, bus, &dev->bus->busn_res); | |
dd7cc44d YZ |
281 | return -ENOMEM; |
282 | } | |
283 | ||
bbef98ab RP |
284 | if (pci_enable_resources(dev, bars)) { |
285 | dev_err(&dev->dev, "SR-IOV: IOV BARS not allocated\n"); | |
286 | return -ENOMEM; | |
287 | } | |
288 | ||
dd7cc44d YZ |
289 | if (iov->link != dev->devfn) { |
290 | pdev = pci_get_slot(dev->bus, iov->link); | |
291 | if (!pdev) | |
292 | return -ENODEV; | |
293 | ||
dc087f2f JL |
294 | if (!pdev->is_physfn) { |
295 | pci_dev_put(pdev); | |
652d1100 | 296 | return -ENOSYS; |
dc087f2f | 297 | } |
dd7cc44d YZ |
298 | |
299 | rc = sysfs_create_link(&dev->dev.kobj, | |
300 | &pdev->dev.kobj, "dep_link"); | |
dc087f2f | 301 | pci_dev_put(pdev); |
dd7cc44d YZ |
302 | if (rc) |
303 | return rc; | |
304 | } | |
305 | ||
f59dca27 | 306 | pci_iov_set_numvfs(dev, nr_virtfn); |
dd7cc44d | 307 | iov->ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE; |
fb51ccbf | 308 | pci_cfg_access_lock(dev); |
dd7cc44d YZ |
309 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); |
310 | msleep(100); | |
fb51ccbf | 311 | pci_cfg_access_unlock(dev); |
dd7cc44d | 312 | |
6b136724 | 313 | iov->initial_VFs = initial; |
dd7cc44d YZ |
314 | if (nr_virtfn < initial) |
315 | initial = nr_virtfn; | |
316 | ||
c23b6135 AD |
317 | rc = pcibios_sriov_enable(dev, initial); |
318 | if (rc) { | |
319 | dev_err(&dev->dev, "failure %d from pcibios_sriov_enable()\n", rc); | |
320 | goto err_pcibios; | |
995df527 WY |
321 | } |
322 | ||
dd7cc44d | 323 | for (i = 0; i < initial; i++) { |
c194f7ea | 324 | rc = pci_iov_add_virtfn(dev, i, 0); |
dd7cc44d YZ |
325 | if (rc) |
326 | goto failed; | |
327 | } | |
328 | ||
329 | kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE); | |
6b136724 | 330 | iov->num_VFs = nr_virtfn; |
dd7cc44d YZ |
331 | |
332 | return 0; | |
333 | ||
334 | failed: | |
3443c382 | 335 | while (i--) |
c194f7ea | 336 | pci_iov_remove_virtfn(dev, i, 0); |
dd7cc44d | 337 | |
c23b6135 AD |
338 | pcibios_sriov_disable(dev); |
339 | err_pcibios: | |
dd7cc44d | 340 | iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE); |
fb51ccbf | 341 | pci_cfg_access_lock(dev); |
dd7cc44d YZ |
342 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); |
343 | ssleep(1); | |
fb51ccbf | 344 | pci_cfg_access_unlock(dev); |
dd7cc44d YZ |
345 | |
346 | if (iov->link != dev->devfn) | |
347 | sysfs_remove_link(&dev->dev.kobj, "dep_link"); | |
348 | ||
b3908644 | 349 | pci_iov_set_numvfs(dev, 0); |
dd7cc44d YZ |
350 | return rc; |
351 | } | |
352 | ||
353 | static void sriov_disable(struct pci_dev *dev) | |
354 | { | |
355 | int i; | |
356 | struct pci_sriov *iov = dev->sriov; | |
357 | ||
6b136724 | 358 | if (!iov->num_VFs) |
dd7cc44d YZ |
359 | return; |
360 | ||
6b136724 | 361 | for (i = 0; i < iov->num_VFs; i++) |
c194f7ea | 362 | pci_iov_remove_virtfn(dev, i, 0); |
dd7cc44d | 363 | |
995df527 WY |
364 | pcibios_sriov_disable(dev); |
365 | ||
dd7cc44d | 366 | iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE); |
fb51ccbf | 367 | pci_cfg_access_lock(dev); |
dd7cc44d YZ |
368 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); |
369 | ssleep(1); | |
fb51ccbf | 370 | pci_cfg_access_unlock(dev); |
dd7cc44d YZ |
371 | |
372 | if (iov->link != dev->devfn) | |
373 | sysfs_remove_link(&dev->dev.kobj, "dep_link"); | |
374 | ||
6b136724 | 375 | iov->num_VFs = 0; |
f59dca27 | 376 | pci_iov_set_numvfs(dev, 0); |
dd7cc44d YZ |
377 | } |
378 | ||
d1b054da YZ |
379 | static int sriov_init(struct pci_dev *dev, int pos) |
380 | { | |
0e6c9122 | 381 | int i, bar64; |
d1b054da YZ |
382 | int rc; |
383 | int nres; | |
384 | u32 pgsz; | |
ea9a8854 | 385 | u16 ctrl, total; |
d1b054da YZ |
386 | struct pci_sriov *iov; |
387 | struct resource *res; | |
388 | struct pci_dev *pdev; | |
389 | ||
d1b054da YZ |
390 | pci_read_config_word(dev, pos + PCI_SRIOV_CTRL, &ctrl); |
391 | if (ctrl & PCI_SRIOV_CTRL_VFE) { | |
392 | pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, 0); | |
393 | ssleep(1); | |
394 | } | |
395 | ||
d1b054da YZ |
396 | ctrl = 0; |
397 | list_for_each_entry(pdev, &dev->bus->devices, bus_list) | |
398 | if (pdev->is_physfn) | |
399 | goto found; | |
400 | ||
401 | pdev = NULL; | |
402 | if (pci_ari_enabled(dev->bus)) | |
403 | ctrl |= PCI_SRIOV_CTRL_ARI; | |
404 | ||
405 | found: | |
406 | pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, ctrl); | |
d1b054da | 407 | |
ff45f9dd BS |
408 | pci_read_config_word(dev, pos + PCI_SRIOV_TOTAL_VF, &total); |
409 | if (!total) | |
410 | return 0; | |
d1b054da YZ |
411 | |
412 | pci_read_config_dword(dev, pos + PCI_SRIOV_SUP_PGSIZE, &pgsz); | |
413 | i = PAGE_SHIFT > 12 ? PAGE_SHIFT - 12 : 0; | |
414 | pgsz &= ~((1 << i) - 1); | |
415 | if (!pgsz) | |
416 | return -EIO; | |
417 | ||
418 | pgsz &= ~(pgsz - 1); | |
8161fe91 | 419 | pci_write_config_dword(dev, pos + PCI_SRIOV_SYS_PGSIZE, pgsz); |
d1b054da | 420 | |
0e6c9122 WY |
421 | iov = kzalloc(sizeof(*iov), GFP_KERNEL); |
422 | if (!iov) | |
423 | return -ENOMEM; | |
424 | ||
d1b054da YZ |
425 | nres = 0; |
426 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { | |
c1fe1f96 | 427 | res = &dev->resource[i + PCI_IOV_RESOURCES]; |
11183991 DD |
428 | /* |
429 | * If it is already FIXED, don't change it, something | |
430 | * (perhaps EA or header fixups) wants it this way. | |
431 | */ | |
432 | if (res->flags & IORESOURCE_PCI_FIXED) | |
433 | bar64 = (res->flags & IORESOURCE_MEM_64) ? 1 : 0; | |
434 | else | |
435 | bar64 = __pci_read_base(dev, pci_bar_unknown, res, | |
436 | pos + PCI_SRIOV_BAR + i * 4); | |
d1b054da YZ |
437 | if (!res->flags) |
438 | continue; | |
439 | if (resource_size(res) & (PAGE_SIZE - 1)) { | |
440 | rc = -EIO; | |
441 | goto failed; | |
442 | } | |
0e6c9122 | 443 | iov->barsz[i] = resource_size(res); |
d1b054da | 444 | res->end = res->start + resource_size(res) * total - 1; |
e88ae01d WY |
445 | dev_info(&dev->dev, "VF(n) BAR%d space: %pR (contains BAR%d for %d VFs)\n", |
446 | i, res, i, total); | |
0e6c9122 | 447 | i += bar64; |
d1b054da YZ |
448 | nres++; |
449 | } | |
450 | ||
d1b054da YZ |
451 | iov->pos = pos; |
452 | iov->nres = nres; | |
453 | iov->ctrl = ctrl; | |
6b136724 | 454 | iov->total_VFs = total; |
d1b054da YZ |
455 | iov->pgsz = pgsz; |
456 | iov->self = dev; | |
457 | pci_read_config_dword(dev, pos + PCI_SRIOV_CAP, &iov->cap); | |
458 | pci_read_config_byte(dev, pos + PCI_SRIOV_FUNC_LINK, &iov->link); | |
62f87c0e | 459 | if (pci_pcie_type(dev) == PCI_EXP_TYPE_RC_END) |
4d135dbe | 460 | iov->link = PCI_DEVFN(PCI_SLOT(dev->devfn), iov->link); |
d1b054da YZ |
461 | |
462 | if (pdev) | |
463 | iov->dev = pci_dev_get(pdev); | |
e277d2fc | 464 | else |
d1b054da | 465 | iov->dev = dev; |
e277d2fc YZ |
466 | |
467 | mutex_init(&iov->lock); | |
d1b054da YZ |
468 | |
469 | dev->sriov = iov; | |
470 | dev->is_physfn = 1; | |
ea9a8854 AD |
471 | rc = compute_max_vf_buses(dev); |
472 | if (rc) | |
473 | goto fail_max_buses; | |
d1b054da YZ |
474 | |
475 | return 0; | |
476 | ||
ea9a8854 AD |
477 | fail_max_buses: |
478 | dev->sriov = NULL; | |
479 | dev->is_physfn = 0; | |
d1b054da YZ |
480 | failed: |
481 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { | |
c1fe1f96 | 482 | res = &dev->resource[i + PCI_IOV_RESOURCES]; |
d1b054da YZ |
483 | res->flags = 0; |
484 | } | |
485 | ||
0e6c9122 | 486 | kfree(iov); |
d1b054da YZ |
487 | return rc; |
488 | } | |
489 | ||
490 | static void sriov_release(struct pci_dev *dev) | |
491 | { | |
6b136724 | 492 | BUG_ON(dev->sriov->num_VFs); |
dd7cc44d | 493 | |
e277d2fc | 494 | if (dev != dev->sriov->dev) |
d1b054da YZ |
495 | pci_dev_put(dev->sriov->dev); |
496 | ||
e277d2fc YZ |
497 | mutex_destroy(&dev->sriov->lock); |
498 | ||
d1b054da YZ |
499 | kfree(dev->sriov); |
500 | dev->sriov = NULL; | |
501 | } | |
502 | ||
8c5cdb6a YZ |
503 | static void sriov_restore_state(struct pci_dev *dev) |
504 | { | |
505 | int i; | |
506 | u16 ctrl; | |
507 | struct pci_sriov *iov = dev->sriov; | |
508 | ||
509 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_CTRL, &ctrl); | |
510 | if (ctrl & PCI_SRIOV_CTRL_VFE) | |
511 | return; | |
512 | ||
513 | for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) | |
514 | pci_update_resource(dev, i); | |
515 | ||
516 | pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz); | |
f59dca27 | 517 | pci_iov_set_numvfs(dev, iov->num_VFs); |
8c5cdb6a YZ |
518 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); |
519 | if (iov->ctrl & PCI_SRIOV_CTRL_VFE) | |
520 | msleep(100); | |
521 | } | |
522 | ||
d1b054da YZ |
523 | /** |
524 | * pci_iov_init - initialize the IOV capability | |
525 | * @dev: the PCI device | |
526 | * | |
527 | * Returns 0 on success, or negative on failure. | |
528 | */ | |
529 | int pci_iov_init(struct pci_dev *dev) | |
530 | { | |
531 | int pos; | |
532 | ||
5f4d91a1 | 533 | if (!pci_is_pcie(dev)) |
d1b054da YZ |
534 | return -ENODEV; |
535 | ||
536 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV); | |
537 | if (pos) | |
538 | return sriov_init(dev, pos); | |
539 | ||
540 | return -ENODEV; | |
541 | } | |
542 | ||
543 | /** | |
544 | * pci_iov_release - release resources used by the IOV capability | |
545 | * @dev: the PCI device | |
546 | */ | |
547 | void pci_iov_release(struct pci_dev *dev) | |
548 | { | |
549 | if (dev->is_physfn) | |
550 | sriov_release(dev); | |
551 | } | |
552 | ||
553 | /** | |
554 | * pci_iov_resource_bar - get position of the SR-IOV BAR | |
555 | * @dev: the PCI device | |
556 | * @resno: the resource number | |
d1b054da YZ |
557 | * |
558 | * Returns position of the BAR encapsulated in the SR-IOV capability. | |
559 | */ | |
26ff46c6 | 560 | int pci_iov_resource_bar(struct pci_dev *dev, int resno) |
d1b054da YZ |
561 | { |
562 | if (resno < PCI_IOV_RESOURCES || resno > PCI_IOV_RESOURCE_END) | |
563 | return 0; | |
564 | ||
565 | BUG_ON(!dev->is_physfn); | |
566 | ||
d1b054da YZ |
567 | return dev->sriov->pos + PCI_SRIOV_BAR + |
568 | 4 * (resno - PCI_IOV_RESOURCES); | |
569 | } | |
8c5cdb6a | 570 | |
978d2d68 WY |
571 | resource_size_t __weak pcibios_iov_resource_alignment(struct pci_dev *dev, |
572 | int resno) | |
573 | { | |
574 | return pci_iov_resource_size(dev, resno); | |
575 | } | |
576 | ||
6faf17f6 CW |
577 | /** |
578 | * pci_sriov_resource_alignment - get resource alignment for VF BAR | |
579 | * @dev: the PCI device | |
580 | * @resno: the resource number | |
581 | * | |
582 | * Returns the alignment of the VF BAR found in the SR-IOV capability. | |
583 | * This is not the same as the resource size which is defined as | |
584 | * the VF BAR size multiplied by the number of VFs. The alignment | |
585 | * is just the VF BAR size. | |
586 | */ | |
0e52247a | 587 | resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno) |
6faf17f6 | 588 | { |
978d2d68 | 589 | return pcibios_iov_resource_alignment(dev, resno); |
6faf17f6 CW |
590 | } |
591 | ||
8c5cdb6a YZ |
592 | /** |
593 | * pci_restore_iov_state - restore the state of the IOV capability | |
594 | * @dev: the PCI device | |
595 | */ | |
596 | void pci_restore_iov_state(struct pci_dev *dev) | |
597 | { | |
598 | if (dev->is_physfn) | |
599 | sriov_restore_state(dev); | |
600 | } | |
a28724b0 YZ |
601 | |
602 | /** | |
603 | * pci_iov_bus_range - find bus range used by Virtual Function | |
604 | * @bus: the PCI bus | |
605 | * | |
606 | * Returns max number of buses (exclude current one) used by Virtual | |
607 | * Functions. | |
608 | */ | |
609 | int pci_iov_bus_range(struct pci_bus *bus) | |
610 | { | |
611 | int max = 0; | |
a28724b0 YZ |
612 | struct pci_dev *dev; |
613 | ||
614 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
615 | if (!dev->is_physfn) | |
616 | continue; | |
4449f079 WY |
617 | if (dev->sriov->max_VF_buses > max) |
618 | max = dev->sriov->max_VF_buses; | |
a28724b0 YZ |
619 | } |
620 | ||
621 | return max ? max - bus->number : 0; | |
622 | } | |
dd7cc44d YZ |
623 | |
624 | /** | |
625 | * pci_enable_sriov - enable the SR-IOV capability | |
626 | * @dev: the PCI device | |
52a8873b | 627 | * @nr_virtfn: number of virtual functions to enable |
dd7cc44d YZ |
628 | * |
629 | * Returns 0 on success, or negative on failure. | |
630 | */ | |
631 | int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn) | |
632 | { | |
633 | might_sleep(); | |
634 | ||
635 | if (!dev->is_physfn) | |
652d1100 | 636 | return -ENOSYS; |
dd7cc44d YZ |
637 | |
638 | return sriov_enable(dev, nr_virtfn); | |
639 | } | |
640 | EXPORT_SYMBOL_GPL(pci_enable_sriov); | |
641 | ||
642 | /** | |
643 | * pci_disable_sriov - disable the SR-IOV capability | |
644 | * @dev: the PCI device | |
645 | */ | |
646 | void pci_disable_sriov(struct pci_dev *dev) | |
647 | { | |
648 | might_sleep(); | |
649 | ||
650 | if (!dev->is_physfn) | |
651 | return; | |
652 | ||
653 | sriov_disable(dev); | |
654 | } | |
655 | EXPORT_SYMBOL_GPL(pci_disable_sriov); | |
74bb1bcc | 656 | |
fb8a0d9d WM |
657 | /** |
658 | * pci_num_vf - return number of VFs associated with a PF device_release_driver | |
659 | * @dev: the PCI device | |
660 | * | |
661 | * Returns number of VFs, or 0 if SR-IOV is not enabled. | |
662 | */ | |
663 | int pci_num_vf(struct pci_dev *dev) | |
664 | { | |
1452cd76 | 665 | if (!dev->is_physfn) |
fb8a0d9d | 666 | return 0; |
1452cd76 BH |
667 | |
668 | return dev->sriov->num_VFs; | |
fb8a0d9d WM |
669 | } |
670 | EXPORT_SYMBOL_GPL(pci_num_vf); | |
bff73156 | 671 | |
5a8eb242 AD |
672 | /** |
673 | * pci_vfs_assigned - returns number of VFs are assigned to a guest | |
674 | * @dev: the PCI device | |
675 | * | |
676 | * Returns number of VFs belonging to this device that are assigned to a guest. | |
652d1100 | 677 | * If device is not a physical function returns 0. |
5a8eb242 AD |
678 | */ |
679 | int pci_vfs_assigned(struct pci_dev *dev) | |
680 | { | |
681 | struct pci_dev *vfdev; | |
682 | unsigned int vfs_assigned = 0; | |
683 | unsigned short dev_id; | |
684 | ||
685 | /* only search if we are a PF */ | |
686 | if (!dev->is_physfn) | |
687 | return 0; | |
688 | ||
689 | /* | |
690 | * determine the device ID for the VFs, the vendor ID will be the | |
691 | * same as the PF so there is no need to check for that one | |
692 | */ | |
693 | pci_read_config_word(dev, dev->sriov->pos + PCI_SRIOV_VF_DID, &dev_id); | |
694 | ||
695 | /* loop through all the VFs to see if we own any that are assigned */ | |
696 | vfdev = pci_get_device(dev->vendor, dev_id, NULL); | |
697 | while (vfdev) { | |
698 | /* | |
699 | * It is considered assigned if it is a virtual function with | |
700 | * our dev as the physical function and the assigned bit is set | |
701 | */ | |
702 | if (vfdev->is_virtfn && (vfdev->physfn == dev) && | |
be63497c | 703 | pci_is_dev_assigned(vfdev)) |
5a8eb242 AD |
704 | vfs_assigned++; |
705 | ||
706 | vfdev = pci_get_device(dev->vendor, dev_id, vfdev); | |
707 | } | |
708 | ||
709 | return vfs_assigned; | |
710 | } | |
711 | EXPORT_SYMBOL_GPL(pci_vfs_assigned); | |
712 | ||
bff73156 DD |
713 | /** |
714 | * pci_sriov_set_totalvfs -- reduce the TotalVFs available | |
715 | * @dev: the PCI PF device | |
2094f167 | 716 | * @numvfs: number that should be used for TotalVFs supported |
bff73156 DD |
717 | * |
718 | * Should be called from PF driver's probe routine with | |
719 | * device's mutex held. | |
720 | * | |
721 | * Returns 0 if PF is an SRIOV-capable device and | |
652d1100 SA |
722 | * value of numvfs valid. If not a PF return -ENOSYS; |
723 | * if numvfs is invalid return -EINVAL; | |
bff73156 DD |
724 | * if VFs already enabled, return -EBUSY. |
725 | */ | |
726 | int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs) | |
727 | { | |
652d1100 SA |
728 | if (!dev->is_physfn) |
729 | return -ENOSYS; | |
730 | if (numvfs > dev->sriov->total_VFs) | |
bff73156 DD |
731 | return -EINVAL; |
732 | ||
733 | /* Shouldn't change if VFs already enabled */ | |
734 | if (dev->sriov->ctrl & PCI_SRIOV_CTRL_VFE) | |
735 | return -EBUSY; | |
736 | else | |
6b136724 | 737 | dev->sriov->driver_max_VFs = numvfs; |
bff73156 DD |
738 | |
739 | return 0; | |
740 | } | |
741 | EXPORT_SYMBOL_GPL(pci_sriov_set_totalvfs); | |
742 | ||
743 | /** | |
ddc191f5 | 744 | * pci_sriov_get_totalvfs -- get total VFs supported on this device |
bff73156 DD |
745 | * @dev: the PCI PF device |
746 | * | |
747 | * For a PCIe device with SRIOV support, return the PCIe | |
6b136724 | 748 | * SRIOV capability value of TotalVFs or the value of driver_max_VFs |
652d1100 | 749 | * if the driver reduced it. Otherwise 0. |
bff73156 DD |
750 | */ |
751 | int pci_sriov_get_totalvfs(struct pci_dev *dev) | |
752 | { | |
1452cd76 | 753 | if (!dev->is_physfn) |
652d1100 | 754 | return 0; |
bff73156 | 755 | |
6b136724 BH |
756 | if (dev->sriov->driver_max_VFs) |
757 | return dev->sriov->driver_max_VFs; | |
1452cd76 BH |
758 | |
759 | return dev->sriov->total_VFs; | |
bff73156 DD |
760 | } |
761 | EXPORT_SYMBOL_GPL(pci_sriov_get_totalvfs); |