Commit | Line | Data |
---|---|---|
3343660d | 1 | /* |
a90fdce9 | 2 | * Virtio PCI driver - common functionality for all device versions |
3343660d AL |
3 | * |
4 | * This module allows virtio devices to be used over a virtual PCI device. | |
5 | * This can be used with QEMU based VMMs like KVM or Xen. | |
6 | * | |
7 | * Copyright IBM Corp. 2007 | |
a90fdce9 | 8 | * Copyright Red Hat, Inc. 2014 |
3343660d AL |
9 | * |
10 | * Authors: | |
11 | * Anthony Liguori <aliguori@us.ibm.com> | |
a90fdce9 MT |
12 | * Rusty Russell <rusty@rustcorp.com.au> |
13 | * Michael S. Tsirkin <mst@redhat.com> | |
3343660d AL |
14 | * |
15 | * This work is licensed under the terms of the GNU GPL, version 2 or later. | |
16 | * See the COPYING file in the top-level directory. | |
17 | * | |
18 | */ | |
19 | ||
5f4c9760 | 20 | #include "virtio_pci_common.h" |
3343660d | 21 | |
ac399d8f MT |
22 | static bool force_legacy = false; |
23 | ||
24 | #if IS_ENABLED(CONFIG_VIRTIO_PCI_LEGACY) | |
25 | module_param(force_legacy, bool, 0444); | |
26 | MODULE_PARM_DESC(force_legacy, | |
27 | "Force legacy mode for transitional virtio 1 devices"); | |
28 | #endif | |
29 | ||
e6af578c | 30 | /* wait for pending irq handlers */ |
38eb4a29 | 31 | void vp_synchronize_vectors(struct virtio_device *vdev) |
e6af578c MT |
32 | { |
33 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
34 | int i; | |
35 | ||
0b0f9dc5 MT |
36 | if (vp_dev->intx_enabled) |
37 | synchronize_irq(vp_dev->pci_dev->irq); | |
38 | ||
39 | for (i = 0; i < vp_dev->msix_vectors; ++i) | |
fa3a3279 | 40 | synchronize_irq(pci_irq_vector(vp_dev->pci_dev, i)); |
e6af578c MT |
41 | } |
42 | ||
3343660d | 43 | /* the notify function used when creating a virt queue */ |
38eb4a29 | 44 | bool vp_notify(struct virtqueue *vq) |
3343660d | 45 | { |
3343660d AL |
46 | /* we write the queue's selector into the notification register to |
47 | * signal the other end */ | |
f30eaf4a | 48 | iowrite16(vq->index, (void __iomem *)vq->priv); |
46f9c2b9 | 49 | return true; |
3343660d AL |
50 | } |
51 | ||
77cf5246 MT |
52 | /* Handle a configuration change: Tell driver if it wants to know. */ |
53 | static irqreturn_t vp_config_changed(int irq, void *opaque) | |
54 | { | |
55 | struct virtio_pci_device *vp_dev = opaque; | |
77cf5246 | 56 | |
016c98c6 | 57 | virtio_config_changed(&vp_dev->vdev); |
77cf5246 MT |
58 | return IRQ_HANDLED; |
59 | } | |
60 | ||
61 | /* Notify all virtqueues on an interrupt. */ | |
62 | static irqreturn_t vp_vring_interrupt(int irq, void *opaque) | |
63 | { | |
64 | struct virtio_pci_device *vp_dev = opaque; | |
0a9b3f47 | 65 | struct virtio_pci_vq_info *info; |
77cf5246 | 66 | irqreturn_t ret = IRQ_NONE; |
0a9b3f47 | 67 | unsigned long flags; |
77cf5246 | 68 | |
0a9b3f47 MT |
69 | spin_lock_irqsave(&vp_dev->lock, flags); |
70 | list_for_each_entry(info, &vp_dev->virtqueues, node) { | |
71 | if (vring_interrupt(irq, info->vq) == IRQ_HANDLED) | |
77cf5246 MT |
72 | ret = IRQ_HANDLED; |
73 | } | |
0a9b3f47 | 74 | spin_unlock_irqrestore(&vp_dev->lock, flags); |
77cf5246 MT |
75 | |
76 | return ret; | |
77 | } | |
78 | ||
3343660d AL |
79 | /* A small wrapper to also acknowledge the interrupt when it's handled. |
80 | * I really need an EIO hook for the vring so I can ack the interrupt once we | |
81 | * know that we'll be handling the IRQ but before we invoke the callback since | |
82 | * the callback may notify the host which results in the host attempting to | |
83 | * raise an interrupt that we would then mask once we acknowledged the | |
84 | * interrupt. */ | |
85 | static irqreturn_t vp_interrupt(int irq, void *opaque) | |
86 | { | |
87 | struct virtio_pci_device *vp_dev = opaque; | |
3343660d AL |
88 | u8 isr; |
89 | ||
90 | /* reading the ISR has the effect of also clearing it so it's very | |
91 | * important to save off the value. */ | |
af535722 | 92 | isr = ioread8(vp_dev->isr); |
3343660d AL |
93 | |
94 | /* It's definitely not us if the ISR was not high */ | |
95 | if (!isr) | |
96 | return IRQ_NONE; | |
97 | ||
98 | /* Configuration change? Tell driver if it wants to know. */ | |
77cf5246 MT |
99 | if (isr & VIRTIO_PCI_ISR_CONFIG) |
100 | vp_config_changed(irq, opaque); | |
3343660d | 101 | |
77cf5246 | 102 | return vp_vring_interrupt(irq, opaque); |
3343660d AL |
103 | } |
104 | ||
0b0f9dc5 MT |
105 | static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors, |
106 | bool per_vq_vectors, struct irq_affinity *desc) | |
107 | { | |
108 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
109 | const char *name = dev_name(&vp_dev->vdev.dev); | |
ba74b6f7 | 110 | unsigned flags = PCI_IRQ_MSIX; |
0b0f9dc5 MT |
111 | unsigned i, v; |
112 | int err = -ENOMEM; | |
113 | ||
114 | vp_dev->msix_vectors = nvectors; | |
115 | ||
6da2ec56 KC |
116 | vp_dev->msix_names = kmalloc_array(nvectors, |
117 | sizeof(*vp_dev->msix_names), | |
118 | GFP_KERNEL); | |
0b0f9dc5 MT |
119 | if (!vp_dev->msix_names) |
120 | goto error; | |
121 | vp_dev->msix_affinity_masks | |
6396bb22 | 122 | = kcalloc(nvectors, sizeof(*vp_dev->msix_affinity_masks), |
0b0f9dc5 MT |
123 | GFP_KERNEL); |
124 | if (!vp_dev->msix_affinity_masks) | |
125 | goto error; | |
126 | for (i = 0; i < nvectors; ++i) | |
127 | if (!alloc_cpumask_var(&vp_dev->msix_affinity_masks[i], | |
128 | GFP_KERNEL)) | |
129 | goto error; | |
130 | ||
ba74b6f7 CH |
131 | if (desc) { |
132 | flags |= PCI_IRQ_AFFINITY; | |
133 | desc->pre_vectors++; /* virtio config vector */ | |
134 | } | |
135 | ||
0b0f9dc5 | 136 | err = pci_alloc_irq_vectors_affinity(vp_dev->pci_dev, nvectors, |
ba74b6f7 | 137 | nvectors, flags, desc); |
0b0f9dc5 MT |
138 | if (err < 0) |
139 | goto error; | |
140 | vp_dev->msix_enabled = 1; | |
141 | ||
142 | /* Set the vector used for configuration */ | |
143 | v = vp_dev->msix_used_vectors; | |
144 | snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names, | |
145 | "%s-config", name); | |
146 | err = request_irq(pci_irq_vector(vp_dev->pci_dev, v), | |
147 | vp_config_changed, 0, vp_dev->msix_names[v], | |
148 | vp_dev); | |
149 | if (err) | |
150 | goto error; | |
151 | ++vp_dev->msix_used_vectors; | |
152 | ||
153 | v = vp_dev->config_vector(vp_dev, v); | |
154 | /* Verify we had enough resources to assign the vector */ | |
155 | if (v == VIRTIO_MSI_NO_VECTOR) { | |
156 | err = -EBUSY; | |
157 | goto error; | |
158 | } | |
159 | ||
160 | if (!per_vq_vectors) { | |
161 | /* Shared vector for all VQs */ | |
162 | v = vp_dev->msix_used_vectors; | |
163 | snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names, | |
164 | "%s-virtqueues", name); | |
165 | err = request_irq(pci_irq_vector(vp_dev->pci_dev, v), | |
166 | vp_vring_interrupt, 0, vp_dev->msix_names[v], | |
167 | vp_dev); | |
168 | if (err) | |
169 | goto error; | |
170 | ++vp_dev->msix_used_vectors; | |
171 | } | |
172 | return 0; | |
173 | error: | |
174 | return err; | |
175 | } | |
176 | ||
0a9b3f47 MT |
177 | static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, unsigned index, |
178 | void (*callback)(struct virtqueue *vq), | |
179 | const char *name, | |
f94682dd | 180 | bool ctx, |
0a9b3f47 MT |
181 | u16 msix_vec) |
182 | { | |
183 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
184 | struct virtio_pci_vq_info *info = kmalloc(sizeof *info, GFP_KERNEL); | |
185 | struct virtqueue *vq; | |
186 | unsigned long flags; | |
187 | ||
188 | /* fill out our structure that represents an active queue */ | |
189 | if (!info) | |
190 | return ERR_PTR(-ENOMEM); | |
191 | ||
f94682dd | 192 | vq = vp_dev->setup_vq(vp_dev, info, index, callback, name, ctx, |
0a9b3f47 MT |
193 | msix_vec); |
194 | if (IS_ERR(vq)) | |
195 | goto out_info; | |
196 | ||
197 | info->vq = vq; | |
198 | if (callback) { | |
199 | spin_lock_irqsave(&vp_dev->lock, flags); | |
200 | list_add(&info->node, &vp_dev->virtqueues); | |
201 | spin_unlock_irqrestore(&vp_dev->lock, flags); | |
202 | } else { | |
203 | INIT_LIST_HEAD(&info->node); | |
204 | } | |
205 | ||
206 | vp_dev->vqs[index] = info; | |
207 | return vq; | |
208 | ||
209 | out_info: | |
210 | kfree(info); | |
211 | return vq; | |
212 | } | |
213 | ||
214 | static void vp_del_vq(struct virtqueue *vq) | |
215 | { | |
216 | struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev); | |
217 | struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index]; | |
218 | unsigned long flags; | |
219 | ||
220 | spin_lock_irqsave(&vp_dev->lock, flags); | |
221 | list_del(&info->node); | |
222 | spin_unlock_irqrestore(&vp_dev->lock, flags); | |
223 | ||
224 | vp_dev->del_vq(info); | |
225 | kfree(info); | |
226 | } | |
227 | ||
0b0f9dc5 MT |
228 | /* the config->del_vqs() implementation */ |
229 | void vp_del_vqs(struct virtio_device *vdev) | |
d2a7ddda | 230 | { |
e969fed5 | 231 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); |
d2a7ddda | 232 | struct virtqueue *vq, *n; |
0b0f9dc5 | 233 | int i; |
d2a7ddda | 234 | |
e969fed5 | 235 | list_for_each_entry_safe(vq, n, &vdev->vqs, list) { |
0a9b3f47 MT |
236 | if (vp_dev->per_vq_vectors) { |
237 | int v = vp_dev->vqs[vq->index]->msix_vector; | |
fa3a3279 | 238 | |
2f8dc3a0 MZ |
239 | if (v != VIRTIO_MSI_NO_VECTOR) { |
240 | int irq = pci_irq_vector(vp_dev->pci_dev, v); | |
241 | ||
242 | irq_set_affinity_hint(irq, NULL); | |
243 | free_irq(irq, vq); | |
244 | } | |
fa3a3279 | 245 | } |
0a9b3f47 | 246 | vp_del_vq(vq); |
e969fed5 | 247 | } |
0a9b3f47 | 248 | vp_dev->per_vq_vectors = false; |
82af8ce8 | 249 | |
0b0f9dc5 MT |
250 | if (vp_dev->intx_enabled) { |
251 | free_irq(vp_dev->pci_dev->irq, vp_dev); | |
252 | vp_dev->intx_enabled = 0; | |
253 | } | |
66f2f555 | 254 | |
0b0f9dc5 MT |
255 | for (i = 0; i < vp_dev->msix_used_vectors; ++i) |
256 | free_irq(pci_irq_vector(vp_dev->pci_dev, i), vp_dev); | |
66f2f555 | 257 | |
0b0f9dc5 MT |
258 | for (i = 0; i < vp_dev->msix_vectors; i++) |
259 | if (vp_dev->msix_affinity_masks[i]) | |
07ec5148 CH |
260 | free_cpumask_var(vp_dev->msix_affinity_masks[i]); |
261 | ||
0b0f9dc5 | 262 | if (vp_dev->msix_enabled) { |
66f2f555 CH |
263 | /* Disable the vector used for configuration */ |
264 | vp_dev->config_vector(vp_dev, VIRTIO_MSI_NO_VECTOR); | |
265 | ||
0b0f9dc5 MT |
266 | pci_free_irq_vectors(vp_dev->pci_dev); |
267 | vp_dev->msix_enabled = 0; | |
66f2f555 CH |
268 | } |
269 | ||
0b0f9dc5 MT |
270 | vp_dev->msix_vectors = 0; |
271 | vp_dev->msix_used_vectors = 0; | |
272 | kfree(vp_dev->msix_names); | |
273 | vp_dev->msix_names = NULL; | |
274 | kfree(vp_dev->msix_affinity_masks); | |
275 | vp_dev->msix_affinity_masks = NULL; | |
0a9b3f47 MT |
276 | kfree(vp_dev->vqs); |
277 | vp_dev->vqs = NULL; | |
d2a7ddda MT |
278 | } |
279 | ||
a3cbec69 | 280 | static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs, |
52a61516 | 281 | struct virtqueue *vqs[], vq_callback_t *callbacks[], |
bf951b10 | 282 | const char * const names[], bool per_vq_vectors, |
f94682dd | 283 | const bool *ctx, |
bf951b10 | 284 | struct irq_affinity *desc) |
d2a7ddda | 285 | { |
e969fed5 | 286 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); |
f68d2408 | 287 | u16 msix_vec; |
0b0f9dc5 | 288 | int i, err, nvectors, allocated_vectors; |
82af8ce8 | 289 | |
0a9b3f47 MT |
290 | vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL); |
291 | if (!vp_dev->vqs) | |
292 | return -ENOMEM; | |
293 | ||
bf951b10 | 294 | if (per_vq_vectors) { |
0b0f9dc5 MT |
295 | /* Best option: one for change interrupt, one per vq. */ |
296 | nvectors = 1; | |
297 | for (i = 0; i < nvqs; ++i) | |
298 | if (callbacks[i]) | |
299 | ++nvectors; | |
bf951b10 | 300 | } else { |
0b0f9dc5 MT |
301 | /* Second best: one for change, shared for all vqs. */ |
302 | nvectors = 2; | |
07ec5148 CH |
303 | } |
304 | ||
0b0f9dc5 MT |
305 | err = vp_request_msix_vectors(vdev, nvectors, per_vq_vectors, |
306 | per_vq_vectors ? desc : NULL); | |
a3cbec69 | 307 | if (err) |
0b0f9dc5 | 308 | goto error_find; |
a3cbec69 | 309 | |
0a9b3f47 | 310 | vp_dev->per_vq_vectors = per_vq_vectors; |
0b0f9dc5 | 311 | allocated_vectors = vp_dev->msix_used_vectors; |
d2a7ddda | 312 | for (i = 0; i < nvqs; ++i) { |
6457f126 MT |
313 | if (!names[i]) { |
314 | vqs[i] = NULL; | |
315 | continue; | |
a3cbec69 CH |
316 | } |
317 | ||
0b0f9dc5 | 318 | if (!callbacks[i]) |
07ec5148 | 319 | msix_vec = VIRTIO_MSI_NO_VECTOR; |
0a9b3f47 | 320 | else if (vp_dev->per_vq_vectors) |
0b0f9dc5 MT |
321 | msix_vec = allocated_vectors++; |
322 | else | |
323 | msix_vec = VP_MSIX_VQ_VECTOR; | |
0a9b3f47 | 324 | vqs[i] = vp_setup_vq(vdev, i, callbacks[i], names[i], |
f94682dd | 325 | ctx ? ctx[i] : false, |
0a9b3f47 | 326 | msix_vec); |
e969fed5 MT |
327 | if (IS_ERR(vqs[i])) { |
328 | err = PTR_ERR(vqs[i]); | |
0b0f9dc5 | 329 | goto error_find; |
e969fed5 | 330 | } |
0b22bd0b | 331 | |
0a9b3f47 | 332 | if (!vp_dev->per_vq_vectors || msix_vec == VIRTIO_MSI_NO_VECTOR) |
5c34d002 | 333 | continue; |
5c34d002 | 334 | |
0b0f9dc5 MT |
335 | /* allocate per-vq irq if available and necessary */ |
336 | snprintf(vp_dev->msix_names[msix_vec], | |
337 | sizeof *vp_dev->msix_names, | |
338 | "%s-%s", | |
0b22bd0b | 339 | dev_name(&vp_dev->vdev.dev), names[i]); |
fa3a3279 | 340 | err = request_irq(pci_irq_vector(vp_dev->pci_dev, msix_vec), |
0b0f9dc5 MT |
341 | vring_interrupt, 0, |
342 | vp_dev->msix_names[msix_vec], | |
343 | vqs[i]); | |
0a9b3f47 | 344 | if (err) |
0b0f9dc5 | 345 | goto error_find; |
d2a7ddda MT |
346 | } |
347 | return 0; | |
348 | ||
0b0f9dc5 MT |
349 | error_find: |
350 | vp_del_vqs(vdev); | |
e969fed5 MT |
351 | return err; |
352 | } | |
353 | ||
a3cbec69 CH |
354 | static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned nvqs, |
355 | struct virtqueue *vqs[], vq_callback_t *callbacks[], | |
f94682dd | 356 | const char * const names[], const bool *ctx) |
a3cbec69 CH |
357 | { |
358 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
359 | int i, err; | |
360 | ||
0a9b3f47 MT |
361 | vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL); |
362 | if (!vp_dev->vqs) | |
363 | return -ENOMEM; | |
364 | ||
a3cbec69 CH |
365 | err = request_irq(vp_dev->pci_dev->irq, vp_interrupt, IRQF_SHARED, |
366 | dev_name(&vdev->dev), vp_dev); | |
367 | if (err) | |
0b0f9dc5 | 368 | goto out_del_vqs; |
a3cbec69 | 369 | |
0b0f9dc5 | 370 | vp_dev->intx_enabled = 1; |
0a9b3f47 | 371 | vp_dev->per_vq_vectors = false; |
a3cbec69 CH |
372 | for (i = 0; i < nvqs; ++i) { |
373 | if (!names[i]) { | |
374 | vqs[i] = NULL; | |
375 | continue; | |
376 | } | |
0a9b3f47 | 377 | vqs[i] = vp_setup_vq(vdev, i, callbacks[i], names[i], |
f94682dd | 378 | ctx ? ctx[i] : false, |
0a9b3f47 | 379 | VIRTIO_MSI_NO_VECTOR); |
a3cbec69 CH |
380 | if (IS_ERR(vqs[i])) { |
381 | err = PTR_ERR(vqs[i]); | |
0b0f9dc5 | 382 | goto out_del_vqs; |
a3cbec69 CH |
383 | } |
384 | } | |
385 | ||
386 | return 0; | |
0b0f9dc5 MT |
387 | out_del_vqs: |
388 | vp_del_vqs(vdev); | |
a3cbec69 CH |
389 | return err; |
390 | } | |
391 | ||
e969fed5 | 392 | /* the config->find_vqs() implementation */ |
38eb4a29 | 393 | int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs, |
fb5e31d9 | 394 | struct virtqueue *vqs[], vq_callback_t *callbacks[], |
f94682dd MT |
395 | const char * const names[], const bool *ctx, |
396 | struct irq_affinity *desc) | |
e969fed5 | 397 | { |
f68d2408 | 398 | int err; |
e969fed5 | 399 | |
bf951b10 | 400 | /* Try MSI-X with one vector per queue. */ |
f94682dd | 401 | err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, true, ctx, desc); |
bf951b10 MT |
402 | if (!err) |
403 | return 0; | |
404 | /* Fallback: MSI-X with one vector for config, one shared for queues. */ | |
f94682dd | 405 | err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, false, ctx, desc); |
e969fed5 MT |
406 | if (!err) |
407 | return 0; | |
bf951b10 | 408 | /* Finally fall back to regular interrupts. */ |
f94682dd | 409 | return vp_find_vqs_intx(vdev, nvqs, vqs, callbacks, names, ctx); |
d2a7ddda MT |
410 | } |
411 | ||
38eb4a29 | 412 | const char *vp_bus_name(struct virtio_device *vdev) |
66846048 RJ |
413 | { |
414 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
415 | ||
416 | return pci_name(vp_dev->pci_dev); | |
417 | } | |
418 | ||
75a0a52b JW |
419 | /* Setup the affinity for a virtqueue: |
420 | * - force the affinity for per vq vector | |
421 | * - OR over all affinities for shared MSI | |
422 | * - ignore the affinity request if we're using INTX | |
423 | */ | |
19e226e8 | 424 | int vp_set_vq_affinity(struct virtqueue *vq, const struct cpumask *cpu_mask) |
75a0a52b JW |
425 | { |
426 | struct virtio_device *vdev = vq->vdev; | |
427 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
0a9b3f47 MT |
428 | struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index]; |
429 | struct cpumask *mask; | |
430 | unsigned int irq; | |
75a0a52b JW |
431 | |
432 | if (!vq->callback) | |
433 | return -EINVAL; | |
434 | ||
2008c154 | 435 | if (vp_dev->msix_enabled) { |
0a9b3f47 MT |
436 | mask = vp_dev->msix_affinity_masks[info->msix_vector]; |
437 | irq = pci_irq_vector(vp_dev->pci_dev, info->msix_vector); | |
19e226e8 | 438 | if (!cpu_mask) |
75a0a52b JW |
439 | irq_set_affinity_hint(irq, NULL); |
440 | else { | |
19e226e8 | 441 | cpumask_copy(mask, cpu_mask); |
75a0a52b JW |
442 | irq_set_affinity_hint(irq, mask); |
443 | } | |
444 | } | |
445 | return 0; | |
446 | } | |
447 | ||
bbaba479 CH |
448 | const struct cpumask *vp_get_vq_affinity(struct virtio_device *vdev, int index) |
449 | { | |
450 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
bbaba479 | 451 | |
0a9b3f47 MT |
452 | if (!vp_dev->per_vq_vectors || |
453 | vp_dev->vqs[index]->msix_vector == VIRTIO_MSI_NO_VECTOR) | |
bbaba479 CH |
454 | return NULL; |
455 | ||
0a9b3f47 MT |
456 | return pci_irq_get_affinity(vp_dev->pci_dev, |
457 | vp_dev->vqs[index]->msix_vector); | |
bbaba479 CH |
458 | } |
459 | ||
9e266ece | 460 | #ifdef CONFIG_PM_SLEEP |
f0fe6f11 AS |
461 | static int virtio_pci_freeze(struct device *dev) |
462 | { | |
463 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
464 | struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev); | |
f0fe6f11 AS |
465 | int ret; |
466 | ||
c6716bae | 467 | ret = virtio_device_freeze(&vp_dev->vdev); |
f0fe6f11 AS |
468 | |
469 | if (!ret) | |
470 | pci_disable_device(pci_dev); | |
471 | return ret; | |
472 | } | |
473 | ||
0517fdd1 | 474 | static int virtio_pci_restore(struct device *dev) |
f0fe6f11 AS |
475 | { |
476 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
477 | struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev); | |
478 | int ret; | |
479 | ||
480 | ret = pci_enable_device(pci_dev); | |
481 | if (ret) | |
482 | return ret; | |
0517fdd1 | 483 | |
f0fe6f11 | 484 | pci_set_master(pci_dev); |
c6716bae | 485 | return virtio_device_restore(&vp_dev->vdev); |
f0fe6f11 AS |
486 | } |
487 | ||
9a4253db | 488 | static const struct dev_pm_ops virtio_pci_pm_ops = { |
f878d0be | 489 | SET_SYSTEM_SLEEP_PM_OPS(virtio_pci_freeze, virtio_pci_restore) |
d0775363 | 490 | }; |
3343660d | 491 | #endif |
9a4253db MT |
492 | |
493 | ||
494 | /* Qumranet donated their vendor ID for devices 0x1000 thru 0x10FF. */ | |
495 | static const struct pci_device_id virtio_pci_id_table[] = { | |
caf02abf | 496 | { PCI_DEVICE(PCI_VENDOR_ID_REDHAT_QUMRANET, PCI_ANY_ID) }, |
9a4253db MT |
497 | { 0 } |
498 | }; | |
499 | ||
500 | MODULE_DEVICE_TABLE(pci, virtio_pci_id_table); | |
501 | ||
ff31d2e2 MT |
502 | static void virtio_pci_release_dev(struct device *_d) |
503 | { | |
504 | struct virtio_device *vdev = dev_to_virtio(_d); | |
505 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
506 | ||
507 | /* As struct device is a kobject, it's not safe to | |
508 | * free the memory (including the reference counter itself) | |
509 | * until it's release callback. */ | |
510 | kfree(vp_dev); | |
511 | } | |
512 | ||
9a4253db MT |
513 | static int virtio_pci_probe(struct pci_dev *pci_dev, |
514 | const struct pci_device_id *id) | |
515 | { | |
33635bd9 | 516 | struct virtio_pci_device *vp_dev, *reg_dev = NULL; |
ff31d2e2 MT |
517 | int rc; |
518 | ||
519 | /* allocate our structure and fill it out */ | |
520 | vp_dev = kzalloc(sizeof(struct virtio_pci_device), GFP_KERNEL); | |
521 | if (!vp_dev) | |
522 | return -ENOMEM; | |
523 | ||
524 | pci_set_drvdata(pci_dev, vp_dev); | |
525 | vp_dev->vdev.dev.parent = &pci_dev->dev; | |
526 | vp_dev->vdev.dev.release = virtio_pci_release_dev; | |
527 | vp_dev->pci_dev = pci_dev; | |
0a9b3f47 MT |
528 | INIT_LIST_HEAD(&vp_dev->virtqueues); |
529 | spin_lock_init(&vp_dev->lock); | |
ff31d2e2 | 530 | |
ff31d2e2 MT |
531 | /* enable the device */ |
532 | rc = pci_enable_device(pci_dev); | |
533 | if (rc) | |
534 | goto err_enable_device; | |
535 | ||
ac399d8f | 536 | if (force_legacy) { |
1fcf0512 | 537 | rc = virtio_pci_legacy_probe(vp_dev); |
ac399d8f MT |
538 | /* Also try modern mode if we can't map BAR0 (no IO space). */ |
539 | if (rc == -ENODEV || rc == -ENOMEM) | |
540 | rc = virtio_pci_modern_probe(vp_dev); | |
541 | if (rc) | |
542 | goto err_probe; | |
543 | } else { | |
544 | rc = virtio_pci_modern_probe(vp_dev); | |
545 | if (rc == -ENODEV) | |
546 | rc = virtio_pci_legacy_probe(vp_dev); | |
547 | if (rc) | |
548 | goto err_probe; | |
549 | } | |
ff31d2e2 MT |
550 | |
551 | pci_set_master(pci_dev); | |
552 | ||
553 | rc = register_virtio_device(&vp_dev->vdev); | |
33635bd9 | 554 | reg_dev = vp_dev; |
ff31d2e2 MT |
555 | if (rc) |
556 | goto err_register; | |
557 | ||
558 | return 0; | |
559 | ||
560 | err_register: | |
1fcf0512 MT |
561 | if (vp_dev->ioaddr) |
562 | virtio_pci_legacy_remove(vp_dev); | |
563 | else | |
564 | virtio_pci_modern_remove(vp_dev); | |
ff31d2e2 | 565 | err_probe: |
ff31d2e2 MT |
566 | pci_disable_device(pci_dev); |
567 | err_enable_device: | |
33635bd9 | 568 | if (reg_dev) |
569 | put_device(&vp_dev->vdev.dev); | |
570 | else | |
571 | kfree(vp_dev); | |
ff31d2e2 | 572 | return rc; |
9a4253db MT |
573 | } |
574 | ||
575 | static void virtio_pci_remove(struct pci_dev *pci_dev) | |
576 | { | |
ff31d2e2 | 577 | struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev); |
2989be09 | 578 | struct device *dev = get_device(&vp_dev->vdev.dev); |
ff31d2e2 | 579 | |
cfecc291 TB |
580 | pci_disable_sriov(pci_dev); |
581 | ||
ff31d2e2 MT |
582 | unregister_virtio_device(&vp_dev->vdev); |
583 | ||
1fcf0512 MT |
584 | if (vp_dev->ioaddr) |
585 | virtio_pci_legacy_remove(vp_dev); | |
586 | else | |
587 | virtio_pci_modern_remove(vp_dev); | |
ff31d2e2 | 588 | |
ff31d2e2 | 589 | pci_disable_device(pci_dev); |
2989be09 | 590 | put_device(dev); |
9a4253db MT |
591 | } |
592 | ||
cfecc291 TB |
593 | static int virtio_pci_sriov_configure(struct pci_dev *pci_dev, int num_vfs) |
594 | { | |
595 | struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev); | |
596 | struct virtio_device *vdev = &vp_dev->vdev; | |
597 | int ret; | |
598 | ||
599 | if (!(vdev->config->get_status(vdev) & VIRTIO_CONFIG_S_DRIVER_OK)) | |
600 | return -EBUSY; | |
601 | ||
602 | if (!__virtio_test_bit(vdev, VIRTIO_F_SR_IOV)) | |
603 | return -EINVAL; | |
604 | ||
605 | if (pci_vfs_assigned(pci_dev)) | |
606 | return -EPERM; | |
607 | ||
608 | if (num_vfs == 0) { | |
609 | pci_disable_sriov(pci_dev); | |
610 | return 0; | |
611 | } | |
612 | ||
613 | ret = pci_enable_sriov(pci_dev, num_vfs); | |
614 | if (ret < 0) | |
615 | return ret; | |
616 | ||
617 | return num_vfs; | |
618 | } | |
619 | ||
9a4253db MT |
620 | static struct pci_driver virtio_pci_driver = { |
621 | .name = "virtio-pci", | |
622 | .id_table = virtio_pci_id_table, | |
623 | .probe = virtio_pci_probe, | |
624 | .remove = virtio_pci_remove, | |
625 | #ifdef CONFIG_PM_SLEEP | |
626 | .driver.pm = &virtio_pci_pm_ops, | |
627 | #endif | |
cfecc291 | 628 | .sriov_configure = virtio_pci_sriov_configure, |
9a4253db MT |
629 | }; |
630 | ||
631 | module_pci_driver(virtio_pci_driver); | |
5ff16110 HX |
632 | |
633 | MODULE_AUTHOR("Anthony Liguori <aliguori@us.ibm.com>"); | |
634 | MODULE_DESCRIPTION("virtio-pci"); | |
635 | MODULE_LICENSE("GPL"); | |
636 | MODULE_VERSION("1"); |