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Commit | Line | Data |
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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); | |
110 | unsigned i, v; | |
111 | int err = -ENOMEM; | |
112 | ||
113 | vp_dev->msix_vectors = nvectors; | |
114 | ||
115 | vp_dev->msix_names = kmalloc(nvectors * sizeof *vp_dev->msix_names, | |
116 | GFP_KERNEL); | |
117 | if (!vp_dev->msix_names) | |
118 | goto error; | |
119 | vp_dev->msix_affinity_masks | |
120 | = kzalloc(nvectors * sizeof *vp_dev->msix_affinity_masks, | |
121 | GFP_KERNEL); | |
122 | if (!vp_dev->msix_affinity_masks) | |
123 | goto error; | |
124 | for (i = 0; i < nvectors; ++i) | |
125 | if (!alloc_cpumask_var(&vp_dev->msix_affinity_masks[i], | |
126 | GFP_KERNEL)) | |
127 | goto error; | |
128 | ||
129 | err = pci_alloc_irq_vectors_affinity(vp_dev->pci_dev, nvectors, | |
130 | nvectors, PCI_IRQ_MSIX | | |
131 | (desc ? PCI_IRQ_AFFINITY : 0), | |
132 | desc); | |
133 | if (err < 0) | |
134 | goto error; | |
135 | vp_dev->msix_enabled = 1; | |
136 | ||
137 | /* Set the vector used for configuration */ | |
138 | v = vp_dev->msix_used_vectors; | |
139 | snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names, | |
140 | "%s-config", name); | |
141 | err = request_irq(pci_irq_vector(vp_dev->pci_dev, v), | |
142 | vp_config_changed, 0, vp_dev->msix_names[v], | |
143 | vp_dev); | |
144 | if (err) | |
145 | goto error; | |
146 | ++vp_dev->msix_used_vectors; | |
147 | ||
148 | v = vp_dev->config_vector(vp_dev, v); | |
149 | /* Verify we had enough resources to assign the vector */ | |
150 | if (v == VIRTIO_MSI_NO_VECTOR) { | |
151 | err = -EBUSY; | |
152 | goto error; | |
153 | } | |
154 | ||
155 | if (!per_vq_vectors) { | |
156 | /* Shared vector for all VQs */ | |
157 | v = vp_dev->msix_used_vectors; | |
158 | snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names, | |
159 | "%s-virtqueues", name); | |
160 | err = request_irq(pci_irq_vector(vp_dev->pci_dev, v), | |
161 | vp_vring_interrupt, 0, vp_dev->msix_names[v], | |
162 | vp_dev); | |
163 | if (err) | |
164 | goto error; | |
165 | ++vp_dev->msix_used_vectors; | |
166 | } | |
167 | return 0; | |
168 | error: | |
169 | return err; | |
170 | } | |
171 | ||
0a9b3f47 MT |
172 | static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, unsigned index, |
173 | void (*callback)(struct virtqueue *vq), | |
174 | const char *name, | |
175 | u16 msix_vec) | |
176 | { | |
177 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
178 | struct virtio_pci_vq_info *info = kmalloc(sizeof *info, GFP_KERNEL); | |
179 | struct virtqueue *vq; | |
180 | unsigned long flags; | |
181 | ||
182 | /* fill out our structure that represents an active queue */ | |
183 | if (!info) | |
184 | return ERR_PTR(-ENOMEM); | |
185 | ||
186 | vq = vp_dev->setup_vq(vp_dev, info, index, callback, name, | |
187 | msix_vec); | |
188 | if (IS_ERR(vq)) | |
189 | goto out_info; | |
190 | ||
191 | info->vq = vq; | |
192 | if (callback) { | |
193 | spin_lock_irqsave(&vp_dev->lock, flags); | |
194 | list_add(&info->node, &vp_dev->virtqueues); | |
195 | spin_unlock_irqrestore(&vp_dev->lock, flags); | |
196 | } else { | |
197 | INIT_LIST_HEAD(&info->node); | |
198 | } | |
199 | ||
200 | vp_dev->vqs[index] = info; | |
201 | return vq; | |
202 | ||
203 | out_info: | |
204 | kfree(info); | |
205 | return vq; | |
206 | } | |
207 | ||
208 | static void vp_del_vq(struct virtqueue *vq) | |
209 | { | |
210 | struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev); | |
211 | struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index]; | |
212 | unsigned long flags; | |
213 | ||
214 | spin_lock_irqsave(&vp_dev->lock, flags); | |
215 | list_del(&info->node); | |
216 | spin_unlock_irqrestore(&vp_dev->lock, flags); | |
217 | ||
218 | vp_dev->del_vq(info); | |
219 | kfree(info); | |
220 | } | |
221 | ||
0b0f9dc5 MT |
222 | /* the config->del_vqs() implementation */ |
223 | void vp_del_vqs(struct virtio_device *vdev) | |
d2a7ddda | 224 | { |
e969fed5 | 225 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); |
d2a7ddda | 226 | struct virtqueue *vq, *n; |
0b0f9dc5 | 227 | int i; |
d2a7ddda | 228 | |
e969fed5 | 229 | list_for_each_entry_safe(vq, n, &vdev->vqs, list) { |
0a9b3f47 MT |
230 | if (vp_dev->per_vq_vectors) { |
231 | int v = vp_dev->vqs[vq->index]->msix_vector; | |
fa3a3279 | 232 | |
2f8dc3a0 MZ |
233 | if (v != VIRTIO_MSI_NO_VECTOR) { |
234 | int irq = pci_irq_vector(vp_dev->pci_dev, v); | |
235 | ||
236 | irq_set_affinity_hint(irq, NULL); | |
237 | free_irq(irq, vq); | |
238 | } | |
fa3a3279 | 239 | } |
0a9b3f47 | 240 | vp_del_vq(vq); |
e969fed5 | 241 | } |
0a9b3f47 | 242 | vp_dev->per_vq_vectors = false; |
82af8ce8 | 243 | |
0b0f9dc5 MT |
244 | if (vp_dev->intx_enabled) { |
245 | free_irq(vp_dev->pci_dev->irq, vp_dev); | |
246 | vp_dev->intx_enabled = 0; | |
247 | } | |
66f2f555 | 248 | |
0b0f9dc5 MT |
249 | for (i = 0; i < vp_dev->msix_used_vectors; ++i) |
250 | free_irq(pci_irq_vector(vp_dev->pci_dev, i), vp_dev); | |
66f2f555 | 251 | |
0b0f9dc5 MT |
252 | for (i = 0; i < vp_dev->msix_vectors; i++) |
253 | if (vp_dev->msix_affinity_masks[i]) | |
07ec5148 CH |
254 | free_cpumask_var(vp_dev->msix_affinity_masks[i]); |
255 | ||
0b0f9dc5 | 256 | if (vp_dev->msix_enabled) { |
66f2f555 CH |
257 | /* Disable the vector used for configuration */ |
258 | vp_dev->config_vector(vp_dev, VIRTIO_MSI_NO_VECTOR); | |
259 | ||
0b0f9dc5 MT |
260 | pci_free_irq_vectors(vp_dev->pci_dev); |
261 | vp_dev->msix_enabled = 0; | |
66f2f555 CH |
262 | } |
263 | ||
0b0f9dc5 MT |
264 | vp_dev->msix_vectors = 0; |
265 | vp_dev->msix_used_vectors = 0; | |
266 | kfree(vp_dev->msix_names); | |
267 | vp_dev->msix_names = NULL; | |
268 | kfree(vp_dev->msix_affinity_masks); | |
269 | vp_dev->msix_affinity_masks = NULL; | |
0a9b3f47 MT |
270 | kfree(vp_dev->vqs); |
271 | vp_dev->vqs = NULL; | |
d2a7ddda MT |
272 | } |
273 | ||
a3cbec69 | 274 | static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs, |
52a61516 | 275 | struct virtqueue *vqs[], vq_callback_t *callbacks[], |
bf951b10 MT |
276 | const char * const names[], bool per_vq_vectors, |
277 | struct irq_affinity *desc) | |
d2a7ddda | 278 | { |
e969fed5 | 279 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); |
f68d2408 | 280 | u16 msix_vec; |
0b0f9dc5 | 281 | int i, err, nvectors, allocated_vectors; |
82af8ce8 | 282 | |
0a9b3f47 MT |
283 | vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL); |
284 | if (!vp_dev->vqs) | |
285 | return -ENOMEM; | |
286 | ||
bf951b10 | 287 | if (per_vq_vectors) { |
0b0f9dc5 MT |
288 | /* Best option: one for change interrupt, one per vq. */ |
289 | nvectors = 1; | |
290 | for (i = 0; i < nvqs; ++i) | |
291 | if (callbacks[i]) | |
292 | ++nvectors; | |
bf951b10 | 293 | } else { |
0b0f9dc5 MT |
294 | /* Second best: one for change, shared for all vqs. */ |
295 | nvectors = 2; | |
07ec5148 CH |
296 | } |
297 | ||
0b0f9dc5 MT |
298 | err = vp_request_msix_vectors(vdev, nvectors, per_vq_vectors, |
299 | per_vq_vectors ? desc : NULL); | |
a3cbec69 | 300 | if (err) |
0b0f9dc5 | 301 | goto error_find; |
a3cbec69 | 302 | |
0a9b3f47 | 303 | vp_dev->per_vq_vectors = per_vq_vectors; |
0b0f9dc5 | 304 | allocated_vectors = vp_dev->msix_used_vectors; |
d2a7ddda | 305 | for (i = 0; i < nvqs; ++i) { |
6457f126 MT |
306 | if (!names[i]) { |
307 | vqs[i] = NULL; | |
308 | continue; | |
a3cbec69 CH |
309 | } |
310 | ||
0b0f9dc5 | 311 | if (!callbacks[i]) |
07ec5148 | 312 | msix_vec = VIRTIO_MSI_NO_VECTOR; |
0a9b3f47 | 313 | else if (vp_dev->per_vq_vectors) |
0b0f9dc5 MT |
314 | msix_vec = allocated_vectors++; |
315 | else | |
316 | msix_vec = VP_MSIX_VQ_VECTOR; | |
0a9b3f47 MT |
317 | vqs[i] = vp_setup_vq(vdev, i, callbacks[i], names[i], |
318 | msix_vec); | |
e969fed5 MT |
319 | if (IS_ERR(vqs[i])) { |
320 | err = PTR_ERR(vqs[i]); | |
0b0f9dc5 | 321 | goto error_find; |
e969fed5 | 322 | } |
0b22bd0b | 323 | |
0a9b3f47 | 324 | if (!vp_dev->per_vq_vectors || msix_vec == VIRTIO_MSI_NO_VECTOR) |
5c34d002 | 325 | continue; |
5c34d002 | 326 | |
0b0f9dc5 MT |
327 | /* allocate per-vq irq if available and necessary */ |
328 | snprintf(vp_dev->msix_names[msix_vec], | |
329 | sizeof *vp_dev->msix_names, | |
330 | "%s-%s", | |
0b22bd0b | 331 | dev_name(&vp_dev->vdev.dev), names[i]); |
fa3a3279 | 332 | err = request_irq(pci_irq_vector(vp_dev->pci_dev, msix_vec), |
0b0f9dc5 MT |
333 | vring_interrupt, 0, |
334 | vp_dev->msix_names[msix_vec], | |
335 | vqs[i]); | |
0a9b3f47 | 336 | if (err) |
0b0f9dc5 | 337 | goto error_find; |
d2a7ddda MT |
338 | } |
339 | return 0; | |
340 | ||
0b0f9dc5 MT |
341 | error_find: |
342 | vp_del_vqs(vdev); | |
e969fed5 MT |
343 | return err; |
344 | } | |
345 | ||
a3cbec69 CH |
346 | static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned nvqs, |
347 | struct virtqueue *vqs[], vq_callback_t *callbacks[], | |
348 | const char * const names[]) | |
349 | { | |
350 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
351 | int i, err; | |
352 | ||
0a9b3f47 MT |
353 | vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL); |
354 | if (!vp_dev->vqs) | |
355 | return -ENOMEM; | |
356 | ||
a3cbec69 CH |
357 | err = request_irq(vp_dev->pci_dev->irq, vp_interrupt, IRQF_SHARED, |
358 | dev_name(&vdev->dev), vp_dev); | |
359 | if (err) | |
0b0f9dc5 | 360 | goto out_del_vqs; |
a3cbec69 | 361 | |
0b0f9dc5 | 362 | vp_dev->intx_enabled = 1; |
0a9b3f47 | 363 | vp_dev->per_vq_vectors = false; |
a3cbec69 CH |
364 | for (i = 0; i < nvqs; ++i) { |
365 | if (!names[i]) { | |
366 | vqs[i] = NULL; | |
367 | continue; | |
368 | } | |
0a9b3f47 MT |
369 | vqs[i] = vp_setup_vq(vdev, i, callbacks[i], names[i], |
370 | VIRTIO_MSI_NO_VECTOR); | |
a3cbec69 CH |
371 | if (IS_ERR(vqs[i])) { |
372 | err = PTR_ERR(vqs[i]); | |
0b0f9dc5 | 373 | goto out_del_vqs; |
a3cbec69 CH |
374 | } |
375 | } | |
376 | ||
377 | return 0; | |
0b0f9dc5 MT |
378 | out_del_vqs: |
379 | vp_del_vqs(vdev); | |
a3cbec69 CH |
380 | return err; |
381 | } | |
382 | ||
e969fed5 | 383 | /* the config->find_vqs() implementation */ |
38eb4a29 | 384 | int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs, |
fb5e31d9 CH |
385 | struct virtqueue *vqs[], vq_callback_t *callbacks[], |
386 | const char * const names[], struct irq_affinity *desc) | |
e969fed5 | 387 | { |
f68d2408 | 388 | int err; |
e969fed5 | 389 | |
bf951b10 MT |
390 | /* Try MSI-X with one vector per queue. */ |
391 | err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, true, desc); | |
392 | if (!err) | |
393 | return 0; | |
394 | /* Fallback: MSI-X with one vector for config, one shared for queues. */ | |
395 | err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, false, desc); | |
e969fed5 MT |
396 | if (!err) |
397 | return 0; | |
bf951b10 | 398 | /* Finally fall back to regular interrupts. */ |
a3cbec69 | 399 | return vp_find_vqs_intx(vdev, nvqs, vqs, callbacks, names); |
d2a7ddda MT |
400 | } |
401 | ||
38eb4a29 | 402 | const char *vp_bus_name(struct virtio_device *vdev) |
66846048 RJ |
403 | { |
404 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
405 | ||
406 | return pci_name(vp_dev->pci_dev); | |
407 | } | |
408 | ||
75a0a52b JW |
409 | /* Setup the affinity for a virtqueue: |
410 | * - force the affinity for per vq vector | |
411 | * - OR over all affinities for shared MSI | |
412 | * - ignore the affinity request if we're using INTX | |
413 | */ | |
38eb4a29 | 414 | int vp_set_vq_affinity(struct virtqueue *vq, int cpu) |
75a0a52b JW |
415 | { |
416 | struct virtio_device *vdev = vq->vdev; | |
417 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
0a9b3f47 MT |
418 | struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index]; |
419 | struct cpumask *mask; | |
420 | unsigned int irq; | |
75a0a52b JW |
421 | |
422 | if (!vq->callback) | |
423 | return -EINVAL; | |
424 | ||
2008c154 | 425 | if (vp_dev->msix_enabled) { |
0a9b3f47 MT |
426 | mask = vp_dev->msix_affinity_masks[info->msix_vector]; |
427 | irq = pci_irq_vector(vp_dev->pci_dev, info->msix_vector); | |
75a0a52b JW |
428 | if (cpu == -1) |
429 | irq_set_affinity_hint(irq, NULL); | |
430 | else { | |
210d150e | 431 | cpumask_clear(mask); |
75a0a52b JW |
432 | cpumask_set_cpu(cpu, mask); |
433 | irq_set_affinity_hint(irq, mask); | |
434 | } | |
435 | } | |
436 | return 0; | |
437 | } | |
438 | ||
bbaba479 CH |
439 | const struct cpumask *vp_get_vq_affinity(struct virtio_device *vdev, int index) |
440 | { | |
441 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
bbaba479 | 442 | |
0a9b3f47 MT |
443 | if (!vp_dev->per_vq_vectors || |
444 | vp_dev->vqs[index]->msix_vector == VIRTIO_MSI_NO_VECTOR) | |
bbaba479 CH |
445 | return NULL; |
446 | ||
0a9b3f47 MT |
447 | return pci_irq_get_affinity(vp_dev->pci_dev, |
448 | vp_dev->vqs[index]->msix_vector); | |
bbaba479 CH |
449 | } |
450 | ||
9e266ece | 451 | #ifdef CONFIG_PM_SLEEP |
f0fe6f11 AS |
452 | static int virtio_pci_freeze(struct device *dev) |
453 | { | |
454 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
455 | struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev); | |
f0fe6f11 AS |
456 | int ret; |
457 | ||
c6716bae | 458 | ret = virtio_device_freeze(&vp_dev->vdev); |
f0fe6f11 AS |
459 | |
460 | if (!ret) | |
461 | pci_disable_device(pci_dev); | |
462 | return ret; | |
463 | } | |
464 | ||
0517fdd1 | 465 | static int virtio_pci_restore(struct device *dev) |
f0fe6f11 AS |
466 | { |
467 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
468 | struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev); | |
469 | int ret; | |
470 | ||
471 | ret = pci_enable_device(pci_dev); | |
472 | if (ret) | |
473 | return ret; | |
0517fdd1 | 474 | |
f0fe6f11 | 475 | pci_set_master(pci_dev); |
c6716bae | 476 | return virtio_device_restore(&vp_dev->vdev); |
f0fe6f11 AS |
477 | } |
478 | ||
9a4253db | 479 | static const struct dev_pm_ops virtio_pci_pm_ops = { |
f878d0be | 480 | SET_SYSTEM_SLEEP_PM_OPS(virtio_pci_freeze, virtio_pci_restore) |
d0775363 | 481 | }; |
3343660d | 482 | #endif |
9a4253db MT |
483 | |
484 | ||
485 | /* Qumranet donated their vendor ID for devices 0x1000 thru 0x10FF. */ | |
486 | static const struct pci_device_id virtio_pci_id_table[] = { | |
caf02abf | 487 | { PCI_DEVICE(PCI_VENDOR_ID_REDHAT_QUMRANET, PCI_ANY_ID) }, |
9a4253db MT |
488 | { 0 } |
489 | }; | |
490 | ||
491 | MODULE_DEVICE_TABLE(pci, virtio_pci_id_table); | |
492 | ||
ff31d2e2 MT |
493 | static void virtio_pci_release_dev(struct device *_d) |
494 | { | |
495 | struct virtio_device *vdev = dev_to_virtio(_d); | |
496 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
497 | ||
498 | /* As struct device is a kobject, it's not safe to | |
499 | * free the memory (including the reference counter itself) | |
500 | * until it's release callback. */ | |
501 | kfree(vp_dev); | |
502 | } | |
503 | ||
9a4253db MT |
504 | static int virtio_pci_probe(struct pci_dev *pci_dev, |
505 | const struct pci_device_id *id) | |
506 | { | |
ff31d2e2 MT |
507 | struct virtio_pci_device *vp_dev; |
508 | int rc; | |
509 | ||
510 | /* allocate our structure and fill it out */ | |
511 | vp_dev = kzalloc(sizeof(struct virtio_pci_device), GFP_KERNEL); | |
512 | if (!vp_dev) | |
513 | return -ENOMEM; | |
514 | ||
515 | pci_set_drvdata(pci_dev, vp_dev); | |
516 | vp_dev->vdev.dev.parent = &pci_dev->dev; | |
517 | vp_dev->vdev.dev.release = virtio_pci_release_dev; | |
518 | vp_dev->pci_dev = pci_dev; | |
0a9b3f47 MT |
519 | INIT_LIST_HEAD(&vp_dev->virtqueues); |
520 | spin_lock_init(&vp_dev->lock); | |
ff31d2e2 | 521 | |
ff31d2e2 MT |
522 | /* enable the device */ |
523 | rc = pci_enable_device(pci_dev); | |
524 | if (rc) | |
525 | goto err_enable_device; | |
526 | ||
ac399d8f | 527 | if (force_legacy) { |
1fcf0512 | 528 | rc = virtio_pci_legacy_probe(vp_dev); |
ac399d8f MT |
529 | /* Also try modern mode if we can't map BAR0 (no IO space). */ |
530 | if (rc == -ENODEV || rc == -ENOMEM) | |
531 | rc = virtio_pci_modern_probe(vp_dev); | |
532 | if (rc) | |
533 | goto err_probe; | |
534 | } else { | |
535 | rc = virtio_pci_modern_probe(vp_dev); | |
536 | if (rc == -ENODEV) | |
537 | rc = virtio_pci_legacy_probe(vp_dev); | |
538 | if (rc) | |
539 | goto err_probe; | |
540 | } | |
ff31d2e2 MT |
541 | |
542 | pci_set_master(pci_dev); | |
543 | ||
544 | rc = register_virtio_device(&vp_dev->vdev); | |
545 | if (rc) | |
546 | goto err_register; | |
547 | ||
548 | return 0; | |
549 | ||
550 | err_register: | |
1fcf0512 MT |
551 | if (vp_dev->ioaddr) |
552 | virtio_pci_legacy_remove(vp_dev); | |
553 | else | |
554 | virtio_pci_modern_remove(vp_dev); | |
ff31d2e2 | 555 | err_probe: |
ff31d2e2 MT |
556 | pci_disable_device(pci_dev); |
557 | err_enable_device: | |
558 | kfree(vp_dev); | |
559 | return rc; | |
9a4253db MT |
560 | } |
561 | ||
562 | static void virtio_pci_remove(struct pci_dev *pci_dev) | |
563 | { | |
ff31d2e2 | 564 | struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev); |
2989be09 | 565 | struct device *dev = get_device(&vp_dev->vdev.dev); |
ff31d2e2 MT |
566 | |
567 | unregister_virtio_device(&vp_dev->vdev); | |
568 | ||
1fcf0512 MT |
569 | if (vp_dev->ioaddr) |
570 | virtio_pci_legacy_remove(vp_dev); | |
571 | else | |
572 | virtio_pci_modern_remove(vp_dev); | |
ff31d2e2 | 573 | |
ff31d2e2 | 574 | pci_disable_device(pci_dev); |
2989be09 | 575 | put_device(dev); |
9a4253db MT |
576 | } |
577 | ||
578 | static struct pci_driver virtio_pci_driver = { | |
579 | .name = "virtio-pci", | |
580 | .id_table = virtio_pci_id_table, | |
581 | .probe = virtio_pci_probe, | |
582 | .remove = virtio_pci_remove, | |
583 | #ifdef CONFIG_PM_SLEEP | |
584 | .driver.pm = &virtio_pci_pm_ops, | |
585 | #endif | |
586 | }; | |
587 | ||
588 | module_pci_driver(virtio_pci_driver); | |
5ff16110 HX |
589 | |
590 | MODULE_AUTHOR("Anthony Liguori <aliguori@us.ibm.com>"); | |
591 | MODULE_DESCRIPTION("virtio-pci"); | |
592 | MODULE_LICENSE("GPL"); | |
593 | MODULE_VERSION("1"); |