Commit | Line | Data |
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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 | ||
f94682dd | 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 | ||
217 | spin_lock_irqsave(&vp_dev->lock, flags); | |
218 | list_del(&info->node); | |
219 | spin_unlock_irqrestore(&vp_dev->lock, flags); | |
220 | ||
221 | vp_dev->del_vq(info); | |
222 | kfree(info); | |
223 | } | |
224 | ||
0b0f9dc5 MT |
225 | /* the config->del_vqs() implementation */ |
226 | void vp_del_vqs(struct virtio_device *vdev) | |
d2a7ddda | 227 | { |
e969fed5 | 228 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); |
d2a7ddda | 229 | struct virtqueue *vq, *n; |
0b0f9dc5 | 230 | int i; |
d2a7ddda | 231 | |
e969fed5 | 232 | list_for_each_entry_safe(vq, n, &vdev->vqs, list) { |
0a9b3f47 MT |
233 | if (vp_dev->per_vq_vectors) { |
234 | int v = vp_dev->vqs[vq->index]->msix_vector; | |
fa3a3279 | 235 | |
2f8dc3a0 MZ |
236 | if (v != VIRTIO_MSI_NO_VECTOR) { |
237 | int irq = pci_irq_vector(vp_dev->pci_dev, v); | |
238 | ||
239 | irq_set_affinity_hint(irq, NULL); | |
240 | free_irq(irq, vq); | |
241 | } | |
fa3a3279 | 242 | } |
0a9b3f47 | 243 | vp_del_vq(vq); |
e969fed5 | 244 | } |
0a9b3f47 | 245 | vp_dev->per_vq_vectors = false; |
82af8ce8 | 246 | |
0b0f9dc5 MT |
247 | if (vp_dev->intx_enabled) { |
248 | free_irq(vp_dev->pci_dev->irq, vp_dev); | |
249 | vp_dev->intx_enabled = 0; | |
250 | } | |
66f2f555 | 251 | |
0b0f9dc5 MT |
252 | for (i = 0; i < vp_dev->msix_used_vectors; ++i) |
253 | free_irq(pci_irq_vector(vp_dev->pci_dev, i), vp_dev); | |
66f2f555 | 254 | |
6a8aae68 L |
255 | if (vp_dev->msix_affinity_masks) { |
256 | for (i = 0; i < vp_dev->msix_vectors; i++) | |
7e415282 | 257 | free_cpumask_var(vp_dev->msix_affinity_masks[i]); |
6a8aae68 | 258 | } |
07ec5148 | 259 | |
0b0f9dc5 | 260 | if (vp_dev->msix_enabled) { |
66f2f555 CH |
261 | /* Disable the vector used for configuration */ |
262 | vp_dev->config_vector(vp_dev, VIRTIO_MSI_NO_VECTOR); | |
263 | ||
0b0f9dc5 MT |
264 | pci_free_irq_vectors(vp_dev->pci_dev); |
265 | vp_dev->msix_enabled = 0; | |
66f2f555 CH |
266 | } |
267 | ||
0b0f9dc5 MT |
268 | vp_dev->msix_vectors = 0; |
269 | vp_dev->msix_used_vectors = 0; | |
270 | kfree(vp_dev->msix_names); | |
271 | vp_dev->msix_names = NULL; | |
272 | kfree(vp_dev->msix_affinity_masks); | |
273 | vp_dev->msix_affinity_masks = NULL; | |
0a9b3f47 MT |
274 | kfree(vp_dev->vqs); |
275 | vp_dev->vqs = NULL; | |
d2a7ddda MT |
276 | } |
277 | ||
31532340 | 278 | static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned int nvqs, |
52a61516 | 279 | struct virtqueue *vqs[], vq_callback_t *callbacks[], |
bf951b10 | 280 | const char * const names[], bool per_vq_vectors, |
f94682dd | 281 | const bool *ctx, |
bf951b10 | 282 | struct irq_affinity *desc) |
d2a7ddda | 283 | { |
e969fed5 | 284 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); |
f68d2408 | 285 | u16 msix_vec; |
ddbeac07 | 286 | int i, err, nvectors, allocated_vectors, queue_idx = 0; |
82af8ce8 | 287 | |
0a9b3f47 MT |
288 | vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL); |
289 | if (!vp_dev->vqs) | |
290 | return -ENOMEM; | |
291 | ||
bf951b10 | 292 | if (per_vq_vectors) { |
0b0f9dc5 MT |
293 | /* Best option: one for change interrupt, one per vq. */ |
294 | nvectors = 1; | |
295 | for (i = 0; i < nvqs; ++i) | |
303090b5 | 296 | if (names[i] && callbacks[i]) |
0b0f9dc5 | 297 | ++nvectors; |
bf951b10 | 298 | } else { |
0b0f9dc5 MT |
299 | /* Second best: one for change, shared for all vqs. */ |
300 | nvectors = 2; | |
07ec5148 CH |
301 | } |
302 | ||
0b0f9dc5 MT |
303 | err = vp_request_msix_vectors(vdev, nvectors, per_vq_vectors, |
304 | per_vq_vectors ? desc : NULL); | |
a3cbec69 | 305 | if (err) |
0b0f9dc5 | 306 | goto error_find; |
a3cbec69 | 307 | |
0a9b3f47 | 308 | vp_dev->per_vq_vectors = per_vq_vectors; |
0b0f9dc5 | 309 | allocated_vectors = vp_dev->msix_used_vectors; |
d2a7ddda | 310 | for (i = 0; i < nvqs; ++i) { |
6457f126 MT |
311 | if (!names[i]) { |
312 | vqs[i] = NULL; | |
313 | continue; | |
a3cbec69 CH |
314 | } |
315 | ||
0b0f9dc5 | 316 | if (!callbacks[i]) |
07ec5148 | 317 | msix_vec = VIRTIO_MSI_NO_VECTOR; |
0a9b3f47 | 318 | else if (vp_dev->per_vq_vectors) |
0b0f9dc5 MT |
319 | msix_vec = allocated_vectors++; |
320 | else | |
321 | msix_vec = VP_MSIX_VQ_VECTOR; | |
ddbeac07 | 322 | vqs[i] = vp_setup_vq(vdev, queue_idx++, callbacks[i], names[i], |
f94682dd | 323 | ctx ? ctx[i] : false, |
0a9b3f47 | 324 | msix_vec); |
e969fed5 MT |
325 | if (IS_ERR(vqs[i])) { |
326 | err = PTR_ERR(vqs[i]); | |
0b0f9dc5 | 327 | goto error_find; |
e969fed5 | 328 | } |
0b22bd0b | 329 | |
0a9b3f47 | 330 | if (!vp_dev->per_vq_vectors || msix_vec == VIRTIO_MSI_NO_VECTOR) |
5c34d002 | 331 | continue; |
5c34d002 | 332 | |
0b0f9dc5 MT |
333 | /* allocate per-vq irq if available and necessary */ |
334 | snprintf(vp_dev->msix_names[msix_vec], | |
335 | sizeof *vp_dev->msix_names, | |
336 | "%s-%s", | |
0b22bd0b | 337 | dev_name(&vp_dev->vdev.dev), names[i]); |
fa3a3279 | 338 | err = request_irq(pci_irq_vector(vp_dev->pci_dev, msix_vec), |
eb4cecb4 | 339 | vring_interrupt, 0, |
0b0f9dc5 MT |
340 | vp_dev->msix_names[msix_vec], |
341 | vqs[i]); | |
0a9b3f47 | 342 | if (err) |
0b0f9dc5 | 343 | goto error_find; |
d2a7ddda MT |
344 | } |
345 | return 0; | |
346 | ||
0b0f9dc5 MT |
347 | error_find: |
348 | vp_del_vqs(vdev); | |
e969fed5 MT |
349 | return err; |
350 | } | |
351 | ||
31532340 | 352 | static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned int nvqs, |
a3cbec69 | 353 | struct virtqueue *vqs[], vq_callback_t *callbacks[], |
f94682dd | 354 | const char * const names[], const bool *ctx) |
a3cbec69 CH |
355 | { |
356 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
ddbeac07 | 357 | int i, err, queue_idx = 0; |
a3cbec69 | 358 | |
0a9b3f47 MT |
359 | vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL); |
360 | if (!vp_dev->vqs) | |
361 | return -ENOMEM; | |
362 | ||
a3cbec69 CH |
363 | err = request_irq(vp_dev->pci_dev->irq, vp_interrupt, IRQF_SHARED, |
364 | dev_name(&vdev->dev), vp_dev); | |
365 | if (err) | |
0b0f9dc5 | 366 | goto out_del_vqs; |
a3cbec69 | 367 | |
0b0f9dc5 | 368 | vp_dev->intx_enabled = 1; |
0a9b3f47 | 369 | vp_dev->per_vq_vectors = false; |
a3cbec69 CH |
370 | for (i = 0; i < nvqs; ++i) { |
371 | if (!names[i]) { | |
372 | vqs[i] = NULL; | |
373 | continue; | |
374 | } | |
ddbeac07 | 375 | vqs[i] = vp_setup_vq(vdev, queue_idx++, callbacks[i], names[i], |
f94682dd | 376 | ctx ? ctx[i] : false, |
0a9b3f47 | 377 | VIRTIO_MSI_NO_VECTOR); |
a3cbec69 CH |
378 | if (IS_ERR(vqs[i])) { |
379 | err = PTR_ERR(vqs[i]); | |
0b0f9dc5 | 380 | goto out_del_vqs; |
a3cbec69 CH |
381 | } |
382 | } | |
383 | ||
384 | return 0; | |
0b0f9dc5 MT |
385 | out_del_vqs: |
386 | vp_del_vqs(vdev); | |
a3cbec69 CH |
387 | return err; |
388 | } | |
389 | ||
e969fed5 | 390 | /* the config->find_vqs() implementation */ |
31532340 | 391 | int vp_find_vqs(struct virtio_device *vdev, unsigned int nvqs, |
fb5e31d9 | 392 | struct virtqueue *vqs[], vq_callback_t *callbacks[], |
f94682dd MT |
393 | const char * const names[], const bool *ctx, |
394 | struct irq_affinity *desc) | |
e969fed5 | 395 | { |
f68d2408 | 396 | int err; |
e969fed5 | 397 | |
bf951b10 | 398 | /* Try MSI-X with one vector per queue. */ |
f94682dd | 399 | err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, true, ctx, desc); |
bf951b10 MT |
400 | if (!err) |
401 | return 0; | |
402 | /* Fallback: MSI-X with one vector for config, one shared for queues. */ | |
f94682dd | 403 | err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, false, ctx, desc); |
e969fed5 MT |
404 | if (!err) |
405 | return 0; | |
bf951b10 | 406 | /* Finally fall back to regular interrupts. */ |
f94682dd | 407 | return vp_find_vqs_intx(vdev, nvqs, vqs, callbacks, names, ctx); |
d2a7ddda MT |
408 | } |
409 | ||
38eb4a29 | 410 | const char *vp_bus_name(struct virtio_device *vdev) |
66846048 RJ |
411 | { |
412 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
413 | ||
414 | return pci_name(vp_dev->pci_dev); | |
415 | } | |
416 | ||
75a0a52b JW |
417 | /* Setup the affinity for a virtqueue: |
418 | * - force the affinity for per vq vector | |
419 | * - OR over all affinities for shared MSI | |
420 | * - ignore the affinity request if we're using INTX | |
421 | */ | |
19e226e8 | 422 | int vp_set_vq_affinity(struct virtqueue *vq, const struct cpumask *cpu_mask) |
75a0a52b JW |
423 | { |
424 | struct virtio_device *vdev = vq->vdev; | |
425 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
0a9b3f47 MT |
426 | struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index]; |
427 | struct cpumask *mask; | |
428 | unsigned int irq; | |
75a0a52b JW |
429 | |
430 | if (!vq->callback) | |
431 | return -EINVAL; | |
432 | ||
2008c154 | 433 | if (vp_dev->msix_enabled) { |
0a9b3f47 MT |
434 | mask = vp_dev->msix_affinity_masks[info->msix_vector]; |
435 | irq = pci_irq_vector(vp_dev->pci_dev, info->msix_vector); | |
19e226e8 | 436 | if (!cpu_mask) |
75a0a52b JW |
437 | irq_set_affinity_hint(irq, NULL); |
438 | else { | |
19e226e8 | 439 | cpumask_copy(mask, cpu_mask); |
75a0a52b JW |
440 | irq_set_affinity_hint(irq, mask); |
441 | } | |
442 | } | |
443 | return 0; | |
444 | } | |
445 | ||
bbaba479 CH |
446 | const struct cpumask *vp_get_vq_affinity(struct virtio_device *vdev, int index) |
447 | { | |
448 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
bbaba479 | 449 | |
0a9b3f47 MT |
450 | if (!vp_dev->per_vq_vectors || |
451 | vp_dev->vqs[index]->msix_vector == VIRTIO_MSI_NO_VECTOR) | |
bbaba479 CH |
452 | return NULL; |
453 | ||
0a9b3f47 MT |
454 | return pci_irq_get_affinity(vp_dev->pci_dev, |
455 | vp_dev->vqs[index]->msix_vector); | |
bbaba479 CH |
456 | } |
457 | ||
9e266ece | 458 | #ifdef CONFIG_PM_SLEEP |
f0fe6f11 AS |
459 | static int virtio_pci_freeze(struct device *dev) |
460 | { | |
461 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
462 | struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev); | |
f0fe6f11 AS |
463 | int ret; |
464 | ||
c6716bae | 465 | ret = virtio_device_freeze(&vp_dev->vdev); |
f0fe6f11 AS |
466 | |
467 | if (!ret) | |
468 | pci_disable_device(pci_dev); | |
469 | return ret; | |
470 | } | |
471 | ||
0517fdd1 | 472 | static int virtio_pci_restore(struct device *dev) |
f0fe6f11 AS |
473 | { |
474 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
475 | struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev); | |
476 | int ret; | |
477 | ||
478 | ret = pci_enable_device(pci_dev); | |
479 | if (ret) | |
480 | return ret; | |
0517fdd1 | 481 | |
f0fe6f11 | 482 | pci_set_master(pci_dev); |
c6716bae | 483 | return virtio_device_restore(&vp_dev->vdev); |
f0fe6f11 AS |
484 | } |
485 | ||
9a4253db | 486 | static const struct dev_pm_ops virtio_pci_pm_ops = { |
f878d0be | 487 | SET_SYSTEM_SLEEP_PM_OPS(virtio_pci_freeze, virtio_pci_restore) |
d0775363 | 488 | }; |
3343660d | 489 | #endif |
9a4253db MT |
490 | |
491 | ||
492 | /* Qumranet donated their vendor ID for devices 0x1000 thru 0x10FF. */ | |
493 | static const struct pci_device_id virtio_pci_id_table[] = { | |
caf02abf | 494 | { PCI_DEVICE(PCI_VENDOR_ID_REDHAT_QUMRANET, PCI_ANY_ID) }, |
9a4253db MT |
495 | { 0 } |
496 | }; | |
497 | ||
498 | MODULE_DEVICE_TABLE(pci, virtio_pci_id_table); | |
499 | ||
ff31d2e2 MT |
500 | static void virtio_pci_release_dev(struct device *_d) |
501 | { | |
502 | struct virtio_device *vdev = dev_to_virtio(_d); | |
503 | struct virtio_pci_device *vp_dev = to_vp_device(vdev); | |
504 | ||
505 | /* As struct device is a kobject, it's not safe to | |
506 | * free the memory (including the reference counter itself) | |
507 | * until it's release callback. */ | |
508 | kfree(vp_dev); | |
509 | } | |
510 | ||
9a4253db MT |
511 | static int virtio_pci_probe(struct pci_dev *pci_dev, |
512 | const struct pci_device_id *id) | |
513 | { | |
33635bd9 | 514 | struct virtio_pci_device *vp_dev, *reg_dev = NULL; |
ff31d2e2 MT |
515 | int rc; |
516 | ||
517 | /* allocate our structure and fill it out */ | |
518 | vp_dev = kzalloc(sizeof(struct virtio_pci_device), GFP_KERNEL); | |
519 | if (!vp_dev) | |
520 | return -ENOMEM; | |
521 | ||
522 | pci_set_drvdata(pci_dev, vp_dev); | |
523 | vp_dev->vdev.dev.parent = &pci_dev->dev; | |
524 | vp_dev->vdev.dev.release = virtio_pci_release_dev; | |
525 | vp_dev->pci_dev = pci_dev; | |
0a9b3f47 MT |
526 | INIT_LIST_HEAD(&vp_dev->virtqueues); |
527 | spin_lock_init(&vp_dev->lock); | |
ff31d2e2 | 528 | |
ff31d2e2 MT |
529 | /* enable the device */ |
530 | rc = pci_enable_device(pci_dev); | |
531 | if (rc) | |
532 | goto err_enable_device; | |
533 | ||
ac399d8f | 534 | if (force_legacy) { |
1fcf0512 | 535 | rc = virtio_pci_legacy_probe(vp_dev); |
ac399d8f MT |
536 | /* Also try modern mode if we can't map BAR0 (no IO space). */ |
537 | if (rc == -ENODEV || rc == -ENOMEM) | |
538 | rc = virtio_pci_modern_probe(vp_dev); | |
539 | if (rc) | |
540 | goto err_probe; | |
541 | } else { | |
542 | rc = virtio_pci_modern_probe(vp_dev); | |
543 | if (rc == -ENODEV) | |
544 | rc = virtio_pci_legacy_probe(vp_dev); | |
545 | if (rc) | |
546 | goto err_probe; | |
547 | } | |
ff31d2e2 MT |
548 | |
549 | pci_set_master(pci_dev); | |
550 | ||
d89c8169 WZ |
551 | vp_dev->is_legacy = vp_dev->ldev.ioaddr ? true : false; |
552 | ||
ff31d2e2 | 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: | |
d89c8169 WZ |
561 | if (vp_dev->is_legacy) |
562 | virtio_pci_legacy_remove(vp_dev); | |
1fcf0512 | 563 | else |
d89c8169 | 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 | |
43bb40c5 PP |
580 | /* |
581 | * Device is marked broken on surprise removal so that virtio upper | |
582 | * layers can abort any ongoing operation. | |
583 | */ | |
584 | if (!pci_device_is_present(pci_dev)) | |
585 | virtio_break_device(&vp_dev->vdev); | |
586 | ||
cfecc291 TB |
587 | pci_disable_sriov(pci_dev); |
588 | ||
ff31d2e2 MT |
589 | unregister_virtio_device(&vp_dev->vdev); |
590 | ||
d89c8169 | 591 | if (vp_dev->is_legacy) |
1fcf0512 MT |
592 | virtio_pci_legacy_remove(vp_dev); |
593 | else | |
594 | virtio_pci_modern_remove(vp_dev); | |
ff31d2e2 | 595 | |
ff31d2e2 | 596 | pci_disable_device(pci_dev); |
2989be09 | 597 | put_device(dev); |
9a4253db MT |
598 | } |
599 | ||
cfecc291 TB |
600 | static int virtio_pci_sriov_configure(struct pci_dev *pci_dev, int num_vfs) |
601 | { | |
602 | struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev); | |
603 | struct virtio_device *vdev = &vp_dev->vdev; | |
604 | int ret; | |
605 | ||
606 | if (!(vdev->config->get_status(vdev) & VIRTIO_CONFIG_S_DRIVER_OK)) | |
607 | return -EBUSY; | |
608 | ||
609 | if (!__virtio_test_bit(vdev, VIRTIO_F_SR_IOV)) | |
610 | return -EINVAL; | |
611 | ||
612 | if (pci_vfs_assigned(pci_dev)) | |
613 | return -EPERM; | |
614 | ||
615 | if (num_vfs == 0) { | |
616 | pci_disable_sriov(pci_dev); | |
617 | return 0; | |
618 | } | |
619 | ||
620 | ret = pci_enable_sriov(pci_dev, num_vfs); | |
621 | if (ret < 0) | |
622 | return ret; | |
623 | ||
624 | return num_vfs; | |
625 | } | |
626 | ||
9a4253db MT |
627 | static struct pci_driver virtio_pci_driver = { |
628 | .name = "virtio-pci", | |
629 | .id_table = virtio_pci_id_table, | |
630 | .probe = virtio_pci_probe, | |
631 | .remove = virtio_pci_remove, | |
632 | #ifdef CONFIG_PM_SLEEP | |
633 | .driver.pm = &virtio_pci_pm_ops, | |
634 | #endif | |
cfecc291 | 635 | .sriov_configure = virtio_pci_sriov_configure, |
9a4253db MT |
636 | }; |
637 | ||
638 | module_pci_driver(virtio_pci_driver); | |
5ff16110 HX |
639 | |
640 | MODULE_AUTHOR("Anthony Liguori <aliguori@us.ibm.com>"); | |
641 | MODULE_DESCRIPTION("virtio-pci"); | |
642 | MODULE_LICENSE("GPL"); | |
643 | MODULE_VERSION("1"); |