Commit | Line | Data |
---|---|---|
f33f5fe2 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
3343660d | 2 | /* |
a90fdce9 | 3 | * Virtio PCI driver - common functionality for all device versions |
3343660d AL |
4 | * |
5 | * This module allows virtio devices to be used over a virtual PCI device. | |
6 | * This can be used with QEMU based VMMs like KVM or Xen. | |
7 | * | |
8 | * Copyright IBM Corp. 2007 | |
a90fdce9 | 9 | * Copyright Red Hat, Inc. 2014 |
3343660d AL |
10 | * |
11 | * Authors: | |
12 | * Anthony Liguori <aliguori@us.ibm.com> | |
a90fdce9 MT |
13 | * Rusty Russell <rusty@rustcorp.com.au> |
14 | * Michael S. Tsirkin <mst@redhat.com> | |
3343660d AL |
15 | */ |
16 | ||
5f4c9760 | 17 | #include "virtio_pci_common.h" |
3343660d | 18 | |
ac399d8f MT |
19 | static bool force_legacy = false; |
20 | ||
21 | #if IS_ENABLED(CONFIG_VIRTIO_PCI_LEGACY) | |
22 | module_param(force_legacy, bool, 0444); | |
23 | MODULE_PARM_DESC(force_legacy, | |
24 | "Force legacy mode for transitional virtio 1 devices"); | |
25 | #endif | |
26 | ||
eb4cecb4 JW |
27 | /* wait for pending irq handlers */ |
28 | void vp_synchronize_vectors(struct virtio_device *vdev) | |
e6af578c MT |
29 | { |
30 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
31 | int i; | |
32 | ||
7b79edfb | 33 | if (vp_dev->intx_enabled) |
0b0f9dc5 MT |
34 | synchronize_irq(vp_dev->pci_dev->irq); |
35 | ||
36 | for (i = 0; i < vp_dev->msix_vectors; ++i) | |
eb4cecb4 | 37 | synchronize_irq(pci_irq_vector(vp_dev->pci_dev, i)); |
e6af578c MT |
38 | } |
39 | ||
3343660d | 40 | /* the notify function used when creating a virt queue */ |
38eb4a29 | 41 | bool vp_notify(struct virtqueue *vq) |
3343660d | 42 | { |
3343660d AL |
43 | /* we write the queue's selector into the notification register to |
44 | * signal the other end */ | |
f30eaf4a | 45 | iowrite16(vq->index, (void __iomem *)vq->priv); |
46f9c2b9 | 46 | return true; |
3343660d AL |
47 | } |
48 | ||
77cf5246 MT |
49 | /* Handle a configuration change: Tell driver if it wants to know. */ |
50 | static irqreturn_t vp_config_changed(int irq, void *opaque) | |
51 | { | |
52 | struct virtio_pci_device *vp_dev = opaque; | |
77cf5246 | 53 | |
016c98c6 | 54 | virtio_config_changed(&vp_dev->vdev); |
77cf5246 MT |
55 | return IRQ_HANDLED; |
56 | } | |
57 | ||
58 | /* Notify all virtqueues on an interrupt. */ | |
59 | static irqreturn_t vp_vring_interrupt(int irq, void *opaque) | |
60 | { | |
61 | struct virtio_pci_device *vp_dev = opaque; | |
0a9b3f47 | 62 | struct virtio_pci_vq_info *info; |
77cf5246 | 63 | irqreturn_t ret = IRQ_NONE; |
0a9b3f47 | 64 | unsigned long flags; |
77cf5246 | 65 | |
0a9b3f47 MT |
66 | spin_lock_irqsave(&vp_dev->lock, flags); |
67 | list_for_each_entry(info, &vp_dev->virtqueues, node) { | |
68 | if (vring_interrupt(irq, info->vq) == IRQ_HANDLED) | |
77cf5246 MT |
69 | ret = IRQ_HANDLED; |
70 | } | |
0a9b3f47 | 71 | spin_unlock_irqrestore(&vp_dev->lock, flags); |
77cf5246 MT |
72 | |
73 | return ret; | |
74 | } | |
75 | ||
3343660d AL |
76 | /* A small wrapper to also acknowledge the interrupt when it's handled. |
77 | * I really need an EIO hook for the vring so I can ack the interrupt once we | |
78 | * know that we'll be handling the IRQ but before we invoke the callback since | |
79 | * the callback may notify the host which results in the host attempting to | |
80 | * raise an interrupt that we would then mask once we acknowledged the | |
81 | * interrupt. */ | |
82 | static irqreturn_t vp_interrupt(int irq, void *opaque) | |
83 | { | |
84 | struct virtio_pci_device *vp_dev = opaque; | |
3343660d AL |
85 | u8 isr; |
86 | ||
87 | /* reading the ISR has the effect of also clearing it so it's very | |
88 | * important to save off the value. */ | |
af535722 | 89 | isr = ioread8(vp_dev->isr); |
3343660d AL |
90 | |
91 | /* It's definitely not us if the ISR was not high */ | |
92 | if (!isr) | |
93 | return IRQ_NONE; | |
94 | ||
95 | /* Configuration change? Tell driver if it wants to know. */ | |
77cf5246 MT |
96 | if (isr & VIRTIO_PCI_ISR_CONFIG) |
97 | vp_config_changed(irq, opaque); | |
3343660d | 98 | |
77cf5246 | 99 | return vp_vring_interrupt(irq, opaque); |
3343660d AL |
100 | } |
101 | ||
0b0f9dc5 MT |
102 | static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors, |
103 | bool per_vq_vectors, struct irq_affinity *desc) | |
104 | { | |
105 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
106 | const char *name = dev_name(&vp_dev->vdev.dev); | |
31532340 ST |
107 | unsigned int flags = PCI_IRQ_MSIX; |
108 | unsigned int i, v; | |
0b0f9dc5 MT |
109 | int err = -ENOMEM; |
110 | ||
111 | vp_dev->msix_vectors = nvectors; | |
112 | ||
6da2ec56 KC |
113 | vp_dev->msix_names = kmalloc_array(nvectors, |
114 | sizeof(*vp_dev->msix_names), | |
115 | GFP_KERNEL); | |
0b0f9dc5 MT |
116 | if (!vp_dev->msix_names) |
117 | goto error; | |
118 | vp_dev->msix_affinity_masks | |
6396bb22 | 119 | = kcalloc(nvectors, sizeof(*vp_dev->msix_affinity_masks), |
0b0f9dc5 MT |
120 | GFP_KERNEL); |
121 | if (!vp_dev->msix_affinity_masks) | |
122 | goto error; | |
123 | for (i = 0; i < nvectors; ++i) | |
124 | if (!alloc_cpumask_var(&vp_dev->msix_affinity_masks[i], | |
125 | GFP_KERNEL)) | |
126 | goto error; | |
127 | ||
ba74b6f7 CH |
128 | if (desc) { |
129 | flags |= PCI_IRQ_AFFINITY; | |
130 | desc->pre_vectors++; /* virtio config vector */ | |
131 | } | |
132 | ||
0b0f9dc5 | 133 | err = pci_alloc_irq_vectors_affinity(vp_dev->pci_dev, nvectors, |
ba74b6f7 | 134 | nvectors, flags, desc); |
0b0f9dc5 MT |
135 | if (err < 0) |
136 | goto error; | |
137 | vp_dev->msix_enabled = 1; | |
138 | ||
139 | /* Set the vector used for configuration */ | |
140 | v = vp_dev->msix_used_vectors; | |
141 | snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names, | |
142 | "%s-config", name); | |
143 | err = request_irq(pci_irq_vector(vp_dev->pci_dev, v), | |
eb4cecb4 | 144 | vp_config_changed, 0, vp_dev->msix_names[v], |
0b0f9dc5 MT |
145 | vp_dev); |
146 | if (err) | |
147 | goto error; | |
148 | ++vp_dev->msix_used_vectors; | |
149 | ||
150 | v = vp_dev->config_vector(vp_dev, v); | |
151 | /* Verify we had enough resources to assign the vector */ | |
152 | if (v == VIRTIO_MSI_NO_VECTOR) { | |
153 | err = -EBUSY; | |
154 | goto error; | |
155 | } | |
156 | ||
157 | if (!per_vq_vectors) { | |
158 | /* Shared vector for all VQs */ | |
159 | v = vp_dev->msix_used_vectors; | |
160 | snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names, | |
161 | "%s-virtqueues", name); | |
162 | err = request_irq(pci_irq_vector(vp_dev->pci_dev, v), | |
eb4cecb4 | 163 | vp_vring_interrupt, 0, vp_dev->msix_names[v], |
0b0f9dc5 MT |
164 | vp_dev); |
165 | if (err) | |
166 | goto error; | |
167 | ++vp_dev->msix_used_vectors; | |
168 | } | |
169 | return 0; | |
170 | error: | |
171 | return err; | |
172 | } | |
173 | ||
31532340 | 174 | static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, unsigned int index, |
0a9b3f47 MT |
175 | void (*callback)(struct virtqueue *vq), |
176 | const char *name, | |
f94682dd | 177 | bool ctx, |
0a9b3f47 MT |
178 | u16 msix_vec) |
179 | { | |
180 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
181 | struct virtio_pci_vq_info *info = kmalloc(sizeof *info, GFP_KERNEL); | |
182 | struct virtqueue *vq; | |
183 | unsigned long flags; | |
184 | ||
185 | /* fill out our structure that represents an active queue */ | |
186 | if (!info) | |
187 | return ERR_PTR(-ENOMEM); | |
188 | ||
13aa8c6c | 189 | vq = vp_dev->setup_vq(vp_dev, info, index, callback, name, ctx, |
0a9b3f47 MT |
190 | msix_vec); |
191 | if (IS_ERR(vq)) | |
192 | goto out_info; | |
193 | ||
194 | info->vq = vq; | |
195 | if (callback) { | |
196 | spin_lock_irqsave(&vp_dev->lock, flags); | |
197 | list_add(&info->node, &vp_dev->virtqueues); | |
198 | spin_unlock_irqrestore(&vp_dev->lock, flags); | |
199 | } else { | |
200 | INIT_LIST_HEAD(&info->node); | |
201 | } | |
202 | ||
203 | vp_dev->vqs[index] = info; | |
204 | return vq; | |
205 | ||
206 | out_info: | |
207 | kfree(info); | |
208 | return vq; | |
209 | } | |
210 | ||
211 | static void vp_del_vq(struct virtqueue *vq) | |
212 | { | |
213 | struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev); | |
214 | struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index]; | |
215 | unsigned long flags; | |
216 | ||
04ca0b0b XZ |
217 | /* |
218 | * If it fails during re-enable reset vq. This way we won't rejoin | |
219 | * info->node to the queue. Prevent unexpected irqs. | |
220 | */ | |
221 | if (!vq->reset) { | |
222 | spin_lock_irqsave(&vp_dev->lock, flags); | |
223 | list_del(&info->node); | |
224 | spin_unlock_irqrestore(&vp_dev->lock, flags); | |
225 | } | |
0a9b3f47 MT |
226 | |
227 | vp_dev->del_vq(info); | |
228 | kfree(info); | |
229 | } | |
230 | ||
0b0f9dc5 MT |
231 | /* the config->del_vqs() implementation */ |
232 | void vp_del_vqs(struct virtio_device *vdev) | |
d2a7ddda | 233 | { |
e969fed5 | 234 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); |
d2a7ddda | 235 | struct virtqueue *vq, *n; |
0b0f9dc5 | 236 | int i; |
d2a7ddda | 237 | |
e969fed5 | 238 | list_for_each_entry_safe(vq, n, &vdev->vqs, list) { |
0a9b3f47 MT |
239 | if (vp_dev->per_vq_vectors) { |
240 | int v = vp_dev->vqs[vq->index]->msix_vector; | |
fa3a3279 | 241 | |
2f8dc3a0 MZ |
242 | if (v != VIRTIO_MSI_NO_VECTOR) { |
243 | int irq = pci_irq_vector(vp_dev->pci_dev, v); | |
244 | ||
245 | irq_set_affinity_hint(irq, NULL); | |
246 | free_irq(irq, vq); | |
247 | } | |
fa3a3279 | 248 | } |
0a9b3f47 | 249 | vp_del_vq(vq); |
e969fed5 | 250 | } |
0a9b3f47 | 251 | vp_dev->per_vq_vectors = false; |
82af8ce8 | 252 | |
0b0f9dc5 MT |
253 | if (vp_dev->intx_enabled) { |
254 | free_irq(vp_dev->pci_dev->irq, vp_dev); | |
255 | vp_dev->intx_enabled = 0; | |
256 | } | |
66f2f555 | 257 | |
0b0f9dc5 MT |
258 | for (i = 0; i < vp_dev->msix_used_vectors; ++i) |
259 | free_irq(pci_irq_vector(vp_dev->pci_dev, i), vp_dev); | |
66f2f555 | 260 | |
6a8aae68 L |
261 | if (vp_dev->msix_affinity_masks) { |
262 | for (i = 0; i < vp_dev->msix_vectors; i++) | |
7e415282 | 263 | free_cpumask_var(vp_dev->msix_affinity_masks[i]); |
6a8aae68 | 264 | } |
07ec5148 | 265 | |
0b0f9dc5 | 266 | if (vp_dev->msix_enabled) { |
66f2f555 CH |
267 | /* Disable the vector used for configuration */ |
268 | vp_dev->config_vector(vp_dev, VIRTIO_MSI_NO_VECTOR); | |
269 | ||
0b0f9dc5 MT |
270 | pci_free_irq_vectors(vp_dev->pci_dev); |
271 | vp_dev->msix_enabled = 0; | |
66f2f555 CH |
272 | } |
273 | ||
0b0f9dc5 MT |
274 | vp_dev->msix_vectors = 0; |
275 | vp_dev->msix_used_vectors = 0; | |
276 | kfree(vp_dev->msix_names); | |
277 | vp_dev->msix_names = NULL; | |
278 | kfree(vp_dev->msix_affinity_masks); | |
279 | vp_dev->msix_affinity_masks = NULL; | |
0a9b3f47 MT |
280 | kfree(vp_dev->vqs); |
281 | vp_dev->vqs = NULL; | |
d2a7ddda MT |
282 | } |
283 | ||
31532340 | 284 | static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned int nvqs, |
52a61516 | 285 | struct virtqueue *vqs[], vq_callback_t *callbacks[], |
13aa8c6c | 286 | const char * const names[], bool per_vq_vectors, |
f94682dd | 287 | const bool *ctx, |
bf951b10 | 288 | struct irq_affinity *desc) |
d2a7ddda | 289 | { |
e969fed5 | 290 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); |
f68d2408 | 291 | u16 msix_vec; |
ddbeac07 | 292 | int i, err, nvectors, allocated_vectors, queue_idx = 0; |
82af8ce8 | 293 | |
0a9b3f47 MT |
294 | vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL); |
295 | if (!vp_dev->vqs) | |
296 | return -ENOMEM; | |
297 | ||
bf951b10 | 298 | if (per_vq_vectors) { |
0b0f9dc5 MT |
299 | /* Best option: one for change interrupt, one per vq. */ |
300 | nvectors = 1; | |
301 | for (i = 0; i < nvqs; ++i) | |
303090b5 | 302 | if (names[i] && callbacks[i]) |
0b0f9dc5 | 303 | ++nvectors; |
bf951b10 | 304 | } else { |
0b0f9dc5 MT |
305 | /* Second best: one for change, shared for all vqs. */ |
306 | nvectors = 2; | |
07ec5148 CH |
307 | } |
308 | ||
0b0f9dc5 MT |
309 | err = vp_request_msix_vectors(vdev, nvectors, per_vq_vectors, |
310 | per_vq_vectors ? desc : NULL); | |
a3cbec69 | 311 | if (err) |
0b0f9dc5 | 312 | goto error_find; |
a3cbec69 | 313 | |
0a9b3f47 | 314 | vp_dev->per_vq_vectors = per_vq_vectors; |
0b0f9dc5 | 315 | allocated_vectors = vp_dev->msix_used_vectors; |
d2a7ddda | 316 | for (i = 0; i < nvqs; ++i) { |
6457f126 MT |
317 | if (!names[i]) { |
318 | vqs[i] = NULL; | |
319 | continue; | |
a3cbec69 CH |
320 | } |
321 | ||
0b0f9dc5 | 322 | if (!callbacks[i]) |
07ec5148 | 323 | msix_vec = VIRTIO_MSI_NO_VECTOR; |
0a9b3f47 | 324 | else if (vp_dev->per_vq_vectors) |
0b0f9dc5 MT |
325 | msix_vec = allocated_vectors++; |
326 | else | |
327 | msix_vec = VP_MSIX_VQ_VECTOR; | |
ddbeac07 | 328 | vqs[i] = vp_setup_vq(vdev, queue_idx++, callbacks[i], names[i], |
13aa8c6c MT |
329 | ctx ? ctx[i] : false, |
330 | msix_vec); | |
e969fed5 MT |
331 | if (IS_ERR(vqs[i])) { |
332 | err = PTR_ERR(vqs[i]); | |
0b0f9dc5 | 333 | goto error_find; |
e969fed5 | 334 | } |
0b22bd0b | 335 | |
0a9b3f47 | 336 | if (!vp_dev->per_vq_vectors || msix_vec == VIRTIO_MSI_NO_VECTOR) |
5c34d002 | 337 | continue; |
5c34d002 | 338 | |
0b0f9dc5 MT |
339 | /* allocate per-vq irq if available and necessary */ |
340 | snprintf(vp_dev->msix_names[msix_vec], | |
341 | sizeof *vp_dev->msix_names, | |
342 | "%s-%s", | |
0b22bd0b | 343 | dev_name(&vp_dev->vdev.dev), names[i]); |
fa3a3279 | 344 | err = request_irq(pci_irq_vector(vp_dev->pci_dev, msix_vec), |
eb4cecb4 | 345 | vring_interrupt, 0, |
0b0f9dc5 MT |
346 | vp_dev->msix_names[msix_vec], |
347 | vqs[i]); | |
0a9b3f47 | 348 | if (err) |
0b0f9dc5 | 349 | goto error_find; |
d2a7ddda MT |
350 | } |
351 | return 0; | |
352 | ||
0b0f9dc5 MT |
353 | error_find: |
354 | vp_del_vqs(vdev); | |
e969fed5 MT |
355 | return err; |
356 | } | |
357 | ||
31532340 | 358 | static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned int nvqs, |
a3cbec69 | 359 | struct virtqueue *vqs[], vq_callback_t *callbacks[], |
13aa8c6c | 360 | const char * const names[], const bool *ctx) |
a3cbec69 CH |
361 | { |
362 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
ddbeac07 | 363 | int i, err, queue_idx = 0; |
a3cbec69 | 364 | |
0a9b3f47 MT |
365 | vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL); |
366 | if (!vp_dev->vqs) | |
367 | return -ENOMEM; | |
368 | ||
a3cbec69 CH |
369 | err = request_irq(vp_dev->pci_dev->irq, vp_interrupt, IRQF_SHARED, |
370 | dev_name(&vdev->dev), vp_dev); | |
371 | if (err) | |
0b0f9dc5 | 372 | goto out_del_vqs; |
a3cbec69 | 373 | |
0b0f9dc5 | 374 | vp_dev->intx_enabled = 1; |
0a9b3f47 | 375 | vp_dev->per_vq_vectors = false; |
a3cbec69 CH |
376 | for (i = 0; i < nvqs; ++i) { |
377 | if (!names[i]) { | |
378 | vqs[i] = NULL; | |
379 | continue; | |
380 | } | |
ddbeac07 | 381 | vqs[i] = vp_setup_vq(vdev, queue_idx++, callbacks[i], names[i], |
f94682dd | 382 | ctx ? ctx[i] : false, |
0a9b3f47 | 383 | VIRTIO_MSI_NO_VECTOR); |
a3cbec69 CH |
384 | if (IS_ERR(vqs[i])) { |
385 | err = PTR_ERR(vqs[i]); | |
0b0f9dc5 | 386 | goto out_del_vqs; |
a3cbec69 CH |
387 | } |
388 | } | |
389 | ||
390 | return 0; | |
0b0f9dc5 MT |
391 | out_del_vqs: |
392 | vp_del_vqs(vdev); | |
a3cbec69 CH |
393 | return err; |
394 | } | |
395 | ||
e969fed5 | 396 | /* the config->find_vqs() implementation */ |
31532340 | 397 | int vp_find_vqs(struct virtio_device *vdev, unsigned int nvqs, |
fb5e31d9 | 398 | struct virtqueue *vqs[], vq_callback_t *callbacks[], |
9993a4f9 | 399 | const char * const names[], const bool *ctx, |
f94682dd | 400 | struct irq_affinity *desc) |
e969fed5 | 401 | { |
f68d2408 | 402 | int err; |
e969fed5 | 403 | |
bf951b10 | 404 | /* Try MSI-X with one vector per queue. */ |
13aa8c6c | 405 | err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, true, ctx, desc); |
bf951b10 MT |
406 | if (!err) |
407 | return 0; | |
408 | /* Fallback: MSI-X with one vector for config, one shared for queues. */ | |
13aa8c6c | 409 | err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, false, ctx, desc); |
e969fed5 MT |
410 | if (!err) |
411 | return 0; | |
bf951b10 | 412 | /* Finally fall back to regular interrupts. */ |
13aa8c6c | 413 | return vp_find_vqs_intx(vdev, nvqs, vqs, callbacks, names, ctx); |
d2a7ddda MT |
414 | } |
415 | ||
38eb4a29 | 416 | const char *vp_bus_name(struct virtio_device *vdev) |
66846048 RJ |
417 | { |
418 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
419 | ||
420 | return pci_name(vp_dev->pci_dev); | |
421 | } | |
422 | ||
75a0a52b JW |
423 | /* Setup the affinity for a virtqueue: |
424 | * - force the affinity for per vq vector | |
425 | * - OR over all affinities for shared MSI | |
426 | * - ignore the affinity request if we're using INTX | |
427 | */ | |
19e226e8 | 428 | int vp_set_vq_affinity(struct virtqueue *vq, const struct cpumask *cpu_mask) |
75a0a52b JW |
429 | { |
430 | struct virtio_device *vdev = vq->vdev; | |
431 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
0a9b3f47 MT |
432 | struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index]; |
433 | struct cpumask *mask; | |
434 | unsigned int irq; | |
75a0a52b JW |
435 | |
436 | if (!vq->callback) | |
437 | return -EINVAL; | |
438 | ||
2008c154 | 439 | if (vp_dev->msix_enabled) { |
0a9b3f47 MT |
440 | mask = vp_dev->msix_affinity_masks[info->msix_vector]; |
441 | irq = pci_irq_vector(vp_dev->pci_dev, info->msix_vector); | |
19e226e8 | 442 | if (!cpu_mask) |
75a0a52b JW |
443 | irq_set_affinity_hint(irq, NULL); |
444 | else { | |
19e226e8 | 445 | cpumask_copy(mask, cpu_mask); |
75a0a52b JW |
446 | irq_set_affinity_hint(irq, mask); |
447 | } | |
448 | } | |
449 | return 0; | |
450 | } | |
451 | ||
bbaba479 CH |
452 | const struct cpumask *vp_get_vq_affinity(struct virtio_device *vdev, int index) |
453 | { | |
454 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
bbaba479 | 455 | |
0a9b3f47 MT |
456 | if (!vp_dev->per_vq_vectors || |
457 | vp_dev->vqs[index]->msix_vector == VIRTIO_MSI_NO_VECTOR) | |
bbaba479 CH |
458 | return NULL; |
459 | ||
0a9b3f47 MT |
460 | return pci_irq_get_affinity(vp_dev->pci_dev, |
461 | vp_dev->vqs[index]->msix_vector); | |
bbaba479 CH |
462 | } |
463 | ||
9e266ece | 464 | #ifdef CONFIG_PM_SLEEP |
f0fe6f11 AS |
465 | static int virtio_pci_freeze(struct device *dev) |
466 | { | |
467 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
468 | struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev); | |
f0fe6f11 AS |
469 | int ret; |
470 | ||
c6716bae | 471 | ret = virtio_device_freeze(&vp_dev->vdev); |
f0fe6f11 AS |
472 | |
473 | if (!ret) | |
474 | pci_disable_device(pci_dev); | |
475 | return ret; | |
476 | } | |
477 | ||
0517fdd1 | 478 | static int virtio_pci_restore(struct device *dev) |
f0fe6f11 AS |
479 | { |
480 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
481 | struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev); | |
482 | int ret; | |
483 | ||
484 | ret = pci_enable_device(pci_dev); | |
485 | if (ret) | |
486 | return ret; | |
0517fdd1 | 487 | |
f0fe6f11 | 488 | pci_set_master(pci_dev); |
c6716bae | 489 | return virtio_device_restore(&vp_dev->vdev); |
f0fe6f11 AS |
490 | } |
491 | ||
9a4253db | 492 | static const struct dev_pm_ops virtio_pci_pm_ops = { |
f878d0be | 493 | SET_SYSTEM_SLEEP_PM_OPS(virtio_pci_freeze, virtio_pci_restore) |
d0775363 | 494 | }; |
3343660d | 495 | #endif |
9a4253db MT |
496 | |
497 | ||
498 | /* Qumranet donated their vendor ID for devices 0x1000 thru 0x10FF. */ | |
499 | static const struct pci_device_id virtio_pci_id_table[] = { | |
caf02abf | 500 | { PCI_DEVICE(PCI_VENDOR_ID_REDHAT_QUMRANET, PCI_ANY_ID) }, |
9a4253db MT |
501 | { 0 } |
502 | }; | |
503 | ||
504 | MODULE_DEVICE_TABLE(pci, virtio_pci_id_table); | |
505 | ||
ff31d2e2 MT |
506 | static void virtio_pci_release_dev(struct device *_d) |
507 | { | |
508 | struct virtio_device *vdev = dev_to_virtio(_d); | |
509 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
510 | ||
511 | /* As struct device is a kobject, it's not safe to | |
512 | * free the memory (including the reference counter itself) | |
513 | * until it's release callback. */ | |
514 | kfree(vp_dev); | |
515 | } | |
516 | ||
9a4253db MT |
517 | static int virtio_pci_probe(struct pci_dev *pci_dev, |
518 | const struct pci_device_id *id) | |
519 | { | |
33635bd9 | 520 | struct virtio_pci_device *vp_dev, *reg_dev = NULL; |
ff31d2e2 MT |
521 | int rc; |
522 | ||
523 | /* allocate our structure and fill it out */ | |
524 | vp_dev = kzalloc(sizeof(struct virtio_pci_device), GFP_KERNEL); | |
525 | if (!vp_dev) | |
526 | return -ENOMEM; | |
527 | ||
528 | pci_set_drvdata(pci_dev, vp_dev); | |
529 | vp_dev->vdev.dev.parent = &pci_dev->dev; | |
530 | vp_dev->vdev.dev.release = virtio_pci_release_dev; | |
531 | vp_dev->pci_dev = pci_dev; | |
0a9b3f47 MT |
532 | INIT_LIST_HEAD(&vp_dev->virtqueues); |
533 | spin_lock_init(&vp_dev->lock); | |
ff31d2e2 | 534 | |
ff31d2e2 MT |
535 | /* enable the device */ |
536 | rc = pci_enable_device(pci_dev); | |
537 | if (rc) | |
538 | goto err_enable_device; | |
539 | ||
ac399d8f | 540 | if (force_legacy) { |
1fcf0512 | 541 | rc = virtio_pci_legacy_probe(vp_dev); |
ac399d8f MT |
542 | /* Also try modern mode if we can't map BAR0 (no IO space). */ |
543 | if (rc == -ENODEV || rc == -ENOMEM) | |
544 | rc = virtio_pci_modern_probe(vp_dev); | |
545 | if (rc) | |
546 | goto err_probe; | |
547 | } else { | |
548 | rc = virtio_pci_modern_probe(vp_dev); | |
549 | if (rc == -ENODEV) | |
550 | rc = virtio_pci_legacy_probe(vp_dev); | |
551 | if (rc) | |
552 | goto err_probe; | |
553 | } | |
ff31d2e2 MT |
554 | |
555 | pci_set_master(pci_dev); | |
556 | ||
d89c8169 WZ |
557 | vp_dev->is_legacy = vp_dev->ldev.ioaddr ? true : false; |
558 | ||
ff31d2e2 | 559 | rc = register_virtio_device(&vp_dev->vdev); |
33635bd9 | 560 | reg_dev = vp_dev; |
ff31d2e2 MT |
561 | if (rc) |
562 | goto err_register; | |
563 | ||
564 | return 0; | |
565 | ||
566 | err_register: | |
d89c8169 WZ |
567 | if (vp_dev->is_legacy) |
568 | virtio_pci_legacy_remove(vp_dev); | |
1fcf0512 | 569 | else |
d89c8169 | 570 | virtio_pci_modern_remove(vp_dev); |
ff31d2e2 | 571 | err_probe: |
ff31d2e2 MT |
572 | pci_disable_device(pci_dev); |
573 | err_enable_device: | |
33635bd9 | 574 | if (reg_dev) |
575 | put_device(&vp_dev->vdev.dev); | |
576 | else | |
577 | kfree(vp_dev); | |
ff31d2e2 | 578 | return rc; |
9a4253db MT |
579 | } |
580 | ||
581 | static void virtio_pci_remove(struct pci_dev *pci_dev) | |
582 | { | |
ff31d2e2 | 583 | struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev); |
2989be09 | 584 | struct device *dev = get_device(&vp_dev->vdev.dev); |
ff31d2e2 | 585 | |
43bb40c5 PP |
586 | /* |
587 | * Device is marked broken on surprise removal so that virtio upper | |
588 | * layers can abort any ongoing operation. | |
589 | */ | |
590 | if (!pci_device_is_present(pci_dev)) | |
591 | virtio_break_device(&vp_dev->vdev); | |
592 | ||
cfecc291 TB |
593 | pci_disable_sriov(pci_dev); |
594 | ||
ff31d2e2 MT |
595 | unregister_virtio_device(&vp_dev->vdev); |
596 | ||
d89c8169 | 597 | if (vp_dev->is_legacy) |
1fcf0512 MT |
598 | virtio_pci_legacy_remove(vp_dev); |
599 | else | |
600 | virtio_pci_modern_remove(vp_dev); | |
ff31d2e2 | 601 | |
ff31d2e2 | 602 | pci_disable_device(pci_dev); |
2989be09 | 603 | put_device(dev); |
9a4253db MT |
604 | } |
605 | ||
cfecc291 TB |
606 | static int virtio_pci_sriov_configure(struct pci_dev *pci_dev, int num_vfs) |
607 | { | |
608 | struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev); | |
609 | struct virtio_device *vdev = &vp_dev->vdev; | |
610 | int ret; | |
611 | ||
612 | if (!(vdev->config->get_status(vdev) & VIRTIO_CONFIG_S_DRIVER_OK)) | |
613 | return -EBUSY; | |
614 | ||
615 | if (!__virtio_test_bit(vdev, VIRTIO_F_SR_IOV)) | |
616 | return -EINVAL; | |
617 | ||
618 | if (pci_vfs_assigned(pci_dev)) | |
619 | return -EPERM; | |
620 | ||
621 | if (num_vfs == 0) { | |
622 | pci_disable_sriov(pci_dev); | |
623 | return 0; | |
624 | } | |
625 | ||
626 | ret = pci_enable_sriov(pci_dev, num_vfs); | |
627 | if (ret < 0) | |
628 | return ret; | |
629 | ||
630 | return num_vfs; | |
631 | } | |
632 | ||
9a4253db MT |
633 | static struct pci_driver virtio_pci_driver = { |
634 | .name = "virtio-pci", | |
635 | .id_table = virtio_pci_id_table, | |
636 | .probe = virtio_pci_probe, | |
637 | .remove = virtio_pci_remove, | |
638 | #ifdef CONFIG_PM_SLEEP | |
639 | .driver.pm = &virtio_pci_pm_ops, | |
640 | #endif | |
cfecc291 | 641 | .sriov_configure = virtio_pci_sriov_configure, |
9a4253db MT |
642 | }; |
643 | ||
644 | module_pci_driver(virtio_pci_driver); | |
5ff16110 HX |
645 | |
646 | MODULE_AUTHOR("Anthony Liguori <aliguori@us.ibm.com>"); | |
647 | MODULE_DESCRIPTION("virtio-pci"); | |
648 | MODULE_LICENSE("GPL"); | |
649 | MODULE_VERSION("1"); |