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4c8cf318 TB |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Copyright (C) 2018-2020 Intel Corporation. | |
4 | * Copyright (C) 2020 Red Hat, Inc. | |
5 | * | |
6 | * Author: Tiwei Bie <tiwei.bie@intel.com> | |
7 | * Jason Wang <jasowang@redhat.com> | |
8 | * | |
9 | * Thanks Michael S. Tsirkin for the valuable comments and | |
10 | * suggestions. And thanks to Cunming Liang and Zhihong Wang for all | |
11 | * their supports. | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/cdev.h> | |
17 | #include <linux/device.h> | |
ddd89d0a | 18 | #include <linux/mm.h> |
9d6d97bf | 19 | #include <linux/slab.h> |
4c8cf318 TB |
20 | #include <linux/iommu.h> |
21 | #include <linux/uuid.h> | |
22 | #include <linux/vdpa.h> | |
23 | #include <linux/nospec.h> | |
24 | #include <linux/vhost.h> | |
4c8cf318 TB |
25 | |
26 | #include "vhost.h" | |
27 | ||
653055b9 | 28 | enum { |
25abc060 JW |
29 | VHOST_VDPA_BACKEND_FEATURES = |
30 | (1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2) | | |
aaca8373 GD |
31 | (1ULL << VHOST_BACKEND_F_IOTLB_BATCH) | |
32 | (1ULL << VHOST_BACKEND_F_IOTLB_ASID), | |
653055b9 JW |
33 | }; |
34 | ||
4c8cf318 TB |
35 | #define VHOST_VDPA_DEV_MAX (1U << MINORBITS) |
36 | ||
3d569879 GD |
37 | #define VHOST_VDPA_IOTLB_BUCKETS 16 |
38 | ||
39 | struct vhost_vdpa_as { | |
40 | struct hlist_node hash_link; | |
41 | struct vhost_iotlb iotlb; | |
42 | u32 id; | |
43 | }; | |
44 | ||
4c8cf318 TB |
45 | struct vhost_vdpa { |
46 | struct vhost_dev vdev; | |
47 | struct iommu_domain *domain; | |
48 | struct vhost_virtqueue *vqs; | |
49 | struct completion completion; | |
50 | struct vdpa_device *vdpa; | |
3d569879 | 51 | struct hlist_head as[VHOST_VDPA_IOTLB_BUCKETS]; |
4c8cf318 TB |
52 | struct device dev; |
53 | struct cdev cdev; | |
54 | atomic_t opened; | |
81d46d69 | 55 | u32 nvqs; |
4c8cf318 TB |
56 | int virtio_id; |
57 | int minor; | |
776f3950 | 58 | struct eventfd_ctx *config_ctx; |
25abc060 | 59 | int in_batch; |
1b48dc03 | 60 | struct vdpa_iova_range range; |
aaca8373 | 61 | u32 batch_asid; |
4c8cf318 TB |
62 | }; |
63 | ||
64 | static DEFINE_IDA(vhost_vdpa_ida); | |
65 | ||
66 | static dev_t vhost_vdpa_major; | |
67 | ||
c070c191 | 68 | static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v, |
e794070a CL |
69 | struct vhost_iotlb *iotlb, u64 start, |
70 | u64 last, u32 asid); | |
c070c191 | 71 | |
aaca8373 GD |
72 | static inline u32 iotlb_to_asid(struct vhost_iotlb *iotlb) |
73 | { | |
74 | struct vhost_vdpa_as *as = container_of(iotlb, struct | |
75 | vhost_vdpa_as, iotlb); | |
76 | return as->id; | |
77 | } | |
78 | ||
3d569879 GD |
79 | static struct vhost_vdpa_as *asid_to_as(struct vhost_vdpa *v, u32 asid) |
80 | { | |
81 | struct hlist_head *head = &v->as[asid % VHOST_VDPA_IOTLB_BUCKETS]; | |
82 | struct vhost_vdpa_as *as; | |
83 | ||
84 | hlist_for_each_entry(as, head, hash_link) | |
85 | if (as->id == asid) | |
86 | return as; | |
87 | ||
88 | return NULL; | |
89 | } | |
90 | ||
aaca8373 GD |
91 | static struct vhost_iotlb *asid_to_iotlb(struct vhost_vdpa *v, u32 asid) |
92 | { | |
93 | struct vhost_vdpa_as *as = asid_to_as(v, asid); | |
94 | ||
95 | if (!as) | |
96 | return NULL; | |
97 | ||
98 | return &as->iotlb; | |
99 | } | |
100 | ||
3d569879 GD |
101 | static struct vhost_vdpa_as *vhost_vdpa_alloc_as(struct vhost_vdpa *v, u32 asid) |
102 | { | |
103 | struct hlist_head *head = &v->as[asid % VHOST_VDPA_IOTLB_BUCKETS]; | |
104 | struct vhost_vdpa_as *as; | |
105 | ||
106 | if (asid_to_as(v, asid)) | |
107 | return NULL; | |
108 | ||
aaca8373 GD |
109 | if (asid >= v->vdpa->nas) |
110 | return NULL; | |
111 | ||
3d569879 GD |
112 | as = kmalloc(sizeof(*as), GFP_KERNEL); |
113 | if (!as) | |
114 | return NULL; | |
115 | ||
116 | vhost_iotlb_init(&as->iotlb, 0, 0); | |
117 | as->id = asid; | |
118 | hlist_add_head(&as->hash_link, head); | |
119 | ||
120 | return as; | |
121 | } | |
122 | ||
aaca8373 GD |
123 | static struct vhost_vdpa_as *vhost_vdpa_find_alloc_as(struct vhost_vdpa *v, |
124 | u32 asid) | |
125 | { | |
126 | struct vhost_vdpa_as *as = asid_to_as(v, asid); | |
127 | ||
128 | if (as) | |
129 | return as; | |
130 | ||
131 | return vhost_vdpa_alloc_as(v, asid); | |
132 | } | |
133 | ||
3d569879 GD |
134 | static int vhost_vdpa_remove_as(struct vhost_vdpa *v, u32 asid) |
135 | { | |
136 | struct vhost_vdpa_as *as = asid_to_as(v, asid); | |
137 | ||
138 | if (!as) | |
139 | return -EINVAL; | |
140 | ||
141 | hlist_del(&as->hash_link); | |
e794070a | 142 | vhost_vdpa_iotlb_unmap(v, &as->iotlb, 0ULL, 0ULL - 1, asid); |
3d569879 GD |
143 | kfree(as); |
144 | ||
145 | return 0; | |
146 | } | |
147 | ||
4c8cf318 TB |
148 | static void handle_vq_kick(struct vhost_work *work) |
149 | { | |
150 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, | |
151 | poll.work); | |
152 | struct vhost_vdpa *v = container_of(vq->dev, struct vhost_vdpa, vdev); | |
153 | const struct vdpa_config_ops *ops = v->vdpa->config; | |
154 | ||
155 | ops->kick_vq(v->vdpa, vq - v->vqs); | |
156 | } | |
157 | ||
158 | static irqreturn_t vhost_vdpa_virtqueue_cb(void *private) | |
159 | { | |
160 | struct vhost_virtqueue *vq = private; | |
265a0ad8 | 161 | struct eventfd_ctx *call_ctx = vq->call_ctx.ctx; |
4c8cf318 TB |
162 | |
163 | if (call_ctx) | |
164 | eventfd_signal(call_ctx, 1); | |
165 | ||
166 | return IRQ_HANDLED; | |
167 | } | |
168 | ||
776f3950 ZL |
169 | static irqreturn_t vhost_vdpa_config_cb(void *private) |
170 | { | |
171 | struct vhost_vdpa *v = private; | |
172 | struct eventfd_ctx *config_ctx = v->config_ctx; | |
173 | ||
174 | if (config_ctx) | |
175 | eventfd_signal(config_ctx, 1); | |
176 | ||
177 | return IRQ_HANDLED; | |
178 | } | |
179 | ||
2cf1ba9a ZL |
180 | static void vhost_vdpa_setup_vq_irq(struct vhost_vdpa *v, u16 qid) |
181 | { | |
182 | struct vhost_virtqueue *vq = &v->vqs[qid]; | |
183 | const struct vdpa_config_ops *ops = v->vdpa->config; | |
184 | struct vdpa_device *vdpa = v->vdpa; | |
185 | int ret, irq; | |
186 | ||
187 | if (!ops->get_vq_irq) | |
188 | return; | |
189 | ||
190 | irq = ops->get_vq_irq(vdpa, qid); | |
cce0ab2b ZL |
191 | if (irq < 0) |
192 | return; | |
193 | ||
2cf1ba9a | 194 | irq_bypass_unregister_producer(&vq->call_ctx.producer); |
cce0ab2b | 195 | if (!vq->call_ctx.ctx) |
2cf1ba9a | 196 | return; |
2cf1ba9a ZL |
197 | |
198 | vq->call_ctx.producer.token = vq->call_ctx.ctx; | |
199 | vq->call_ctx.producer.irq = irq; | |
200 | ret = irq_bypass_register_producer(&vq->call_ctx.producer); | |
e01afe36 ZL |
201 | if (unlikely(ret)) |
202 | dev_info(&v->dev, "vq %u, irq bypass producer (token %p) registration fails, ret = %d\n", | |
203 | qid, vq->call_ctx.producer.token, ret); | |
2cf1ba9a ZL |
204 | } |
205 | ||
206 | static void vhost_vdpa_unsetup_vq_irq(struct vhost_vdpa *v, u16 qid) | |
207 | { | |
208 | struct vhost_virtqueue *vq = &v->vqs[qid]; | |
209 | ||
2cf1ba9a | 210 | irq_bypass_unregister_producer(&vq->call_ctx.producer); |
2cf1ba9a ZL |
211 | } |
212 | ||
7f05630d | 213 | static int vhost_vdpa_reset(struct vhost_vdpa *v) |
4c8cf318 TB |
214 | { |
215 | struct vdpa_device *vdpa = v->vdpa; | |
4c8cf318 | 216 | |
25abc060 | 217 | v->in_batch = 0; |
7f05630d XY |
218 | |
219 | return vdpa_reset(vdpa); | |
4c8cf318 TB |
220 | } |
221 | ||
9067de47 SG |
222 | static long vhost_vdpa_bind_mm(struct vhost_vdpa *v) |
223 | { | |
224 | struct vdpa_device *vdpa = v->vdpa; | |
225 | const struct vdpa_config_ops *ops = vdpa->config; | |
226 | ||
227 | if (!vdpa->use_va || !ops->bind_mm) | |
228 | return 0; | |
229 | ||
230 | return ops->bind_mm(vdpa, v->vdev.mm); | |
231 | } | |
232 | ||
233 | static void vhost_vdpa_unbind_mm(struct vhost_vdpa *v) | |
234 | { | |
235 | struct vdpa_device *vdpa = v->vdpa; | |
236 | const struct vdpa_config_ops *ops = vdpa->config; | |
237 | ||
238 | if (!vdpa->use_va || !ops->unbind_mm) | |
239 | return; | |
240 | ||
241 | ops->unbind_mm(vdpa); | |
242 | } | |
243 | ||
4c8cf318 TB |
244 | static long vhost_vdpa_get_device_id(struct vhost_vdpa *v, u8 __user *argp) |
245 | { | |
246 | struct vdpa_device *vdpa = v->vdpa; | |
247 | const struct vdpa_config_ops *ops = vdpa->config; | |
248 | u32 device_id; | |
249 | ||
250 | device_id = ops->get_device_id(vdpa); | |
251 | ||
252 | if (copy_to_user(argp, &device_id, sizeof(device_id))) | |
253 | return -EFAULT; | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
258 | static long vhost_vdpa_get_status(struct vhost_vdpa *v, u8 __user *statusp) | |
259 | { | |
260 | struct vdpa_device *vdpa = v->vdpa; | |
f6d955d8 | 261 | const struct vdpa_config_ops *ops = vdpa->config; |
4c8cf318 TB |
262 | u8 status; |
263 | ||
f6d955d8 | 264 | status = ops->get_status(vdpa); |
4c8cf318 TB |
265 | |
266 | if (copy_to_user(statusp, &status, sizeof(status))) | |
267 | return -EFAULT; | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
272 | static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp) | |
273 | { | |
274 | struct vdpa_device *vdpa = v->vdpa; | |
275 | const struct vdpa_config_ops *ops = vdpa->config; | |
2cf1ba9a | 276 | u8 status, status_old; |
81d46d69 L |
277 | u32 nvqs = v->nvqs; |
278 | int ret; | |
2cf1ba9a | 279 | u16 i; |
4c8cf318 TB |
280 | |
281 | if (copy_from_user(&status, statusp, sizeof(status))) | |
282 | return -EFAULT; | |
283 | ||
f6d955d8 | 284 | status_old = ops->get_status(vdpa); |
2cf1ba9a | 285 | |
4c8cf318 TB |
286 | /* |
287 | * Userspace shouldn't remove status bits unless reset the | |
288 | * status to 0. | |
289 | */ | |
23118b09 | 290 | if (status != 0 && (status_old & ~status) != 0) |
4c8cf318 TB |
291 | return -EINVAL; |
292 | ||
97f854be WZ |
293 | if ((status_old & VIRTIO_CONFIG_S_DRIVER_OK) && !(status & VIRTIO_CONFIG_S_DRIVER_OK)) |
294 | for (i = 0; i < nvqs; i++) | |
295 | vhost_vdpa_unsetup_vq_irq(v, i); | |
296 | ||
0686082d | 297 | if (status == 0) { |
680ab9d6 | 298 | ret = vdpa_reset(vdpa); |
0686082d XY |
299 | if (ret) |
300 | return ret; | |
301 | } else | |
73bc0dbb | 302 | vdpa_set_status(vdpa, status); |
4c8cf318 | 303 | |
2cf1ba9a ZL |
304 | if ((status & VIRTIO_CONFIG_S_DRIVER_OK) && !(status_old & VIRTIO_CONFIG_S_DRIVER_OK)) |
305 | for (i = 0; i < nvqs; i++) | |
306 | vhost_vdpa_setup_vq_irq(v, i); | |
307 | ||
4c8cf318 TB |
308 | return 0; |
309 | } | |
310 | ||
311 | static int vhost_vdpa_config_validate(struct vhost_vdpa *v, | |
312 | struct vhost_vdpa_config *c) | |
313 | { | |
d6d8bb92 | 314 | struct vdpa_device *vdpa = v->vdpa; |
870aaff9 | 315 | size_t size = vdpa->config->get_config_size(vdpa); |
4c8cf318 | 316 | |
3ed21c14 | 317 | if (c->len == 0 || c->off > size) |
4c8cf318 TB |
318 | return -EINVAL; |
319 | ||
320 | if (c->len > size - c->off) | |
321 | return -E2BIG; | |
322 | ||
323 | return 0; | |
324 | } | |
325 | ||
326 | static long vhost_vdpa_get_config(struct vhost_vdpa *v, | |
327 | struct vhost_vdpa_config __user *c) | |
328 | { | |
329 | struct vdpa_device *vdpa = v->vdpa; | |
4c8cf318 TB |
330 | struct vhost_vdpa_config config; |
331 | unsigned long size = offsetof(struct vhost_vdpa_config, buf); | |
332 | u8 *buf; | |
333 | ||
334 | if (copy_from_user(&config, c, size)) | |
335 | return -EFAULT; | |
336 | if (vhost_vdpa_config_validate(v, &config)) | |
337 | return -EINVAL; | |
338 | buf = kvzalloc(config.len, GFP_KERNEL); | |
339 | if (!buf) | |
340 | return -ENOMEM; | |
341 | ||
0d234007 | 342 | vdpa_get_config(vdpa, config.off, buf, config.len); |
4c8cf318 TB |
343 | |
344 | if (copy_to_user(c->buf, buf, config.len)) { | |
345 | kvfree(buf); | |
346 | return -EFAULT; | |
347 | } | |
348 | ||
349 | kvfree(buf); | |
350 | return 0; | |
351 | } | |
352 | ||
353 | static long vhost_vdpa_set_config(struct vhost_vdpa *v, | |
354 | struct vhost_vdpa_config __user *c) | |
355 | { | |
356 | struct vdpa_device *vdpa = v->vdpa; | |
4c8cf318 TB |
357 | struct vhost_vdpa_config config; |
358 | unsigned long size = offsetof(struct vhost_vdpa_config, buf); | |
359 | u8 *buf; | |
360 | ||
361 | if (copy_from_user(&config, c, size)) | |
362 | return -EFAULT; | |
363 | if (vhost_vdpa_config_validate(v, &config)) | |
364 | return -EINVAL; | |
4c8cf318 | 365 | |
0ab4b890 TT |
366 | buf = vmemdup_user(c->buf, config.len); |
367 | if (IS_ERR(buf)) | |
368 | return PTR_ERR(buf); | |
4c8cf318 | 369 | |
6dbb1f16 | 370 | vdpa_set_config(vdpa, config.off, buf, config.len); |
4c8cf318 TB |
371 | |
372 | kvfree(buf); | |
373 | return 0; | |
374 | } | |
375 | ||
0723f1df EP |
376 | static bool vhost_vdpa_can_suspend(const struct vhost_vdpa *v) |
377 | { | |
378 | struct vdpa_device *vdpa = v->vdpa; | |
379 | const struct vdpa_config_ops *ops = vdpa->config; | |
380 | ||
381 | return ops->suspend; | |
382 | } | |
383 | ||
69106b6f SB |
384 | static bool vhost_vdpa_can_resume(const struct vhost_vdpa *v) |
385 | { | |
386 | struct vdpa_device *vdpa = v->vdpa; | |
387 | const struct vdpa_config_ops *ops = vdpa->config; | |
388 | ||
389 | return ops->resume; | |
390 | } | |
391 | ||
4c8cf318 TB |
392 | static long vhost_vdpa_get_features(struct vhost_vdpa *v, u64 __user *featurep) |
393 | { | |
394 | struct vdpa_device *vdpa = v->vdpa; | |
395 | const struct vdpa_config_ops *ops = vdpa->config; | |
396 | u64 features; | |
397 | ||
a64917bc | 398 | features = ops->get_device_features(vdpa); |
4c8cf318 TB |
399 | |
400 | if (copy_to_user(featurep, &features, sizeof(features))) | |
401 | return -EFAULT; | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
406 | static long vhost_vdpa_set_features(struct vhost_vdpa *v, u64 __user *featurep) | |
407 | { | |
408 | struct vdpa_device *vdpa = v->vdpa; | |
409 | const struct vdpa_config_ops *ops = vdpa->config; | |
410 | u64 features; | |
411 | ||
412 | /* | |
413 | * It's not allowed to change the features after they have | |
414 | * been negotiated. | |
415 | */ | |
416 | if (ops->get_status(vdpa) & VIRTIO_CONFIG_S_FEATURES_OK) | |
417 | return -EBUSY; | |
418 | ||
419 | if (copy_from_user(&features, featurep, sizeof(features))) | |
420 | return -EFAULT; | |
421 | ||
e0077cc1 | 422 | if (vdpa_set_features(vdpa, features)) |
4c8cf318 TB |
423 | return -EINVAL; |
424 | ||
425 | return 0; | |
426 | } | |
427 | ||
428 | static long vhost_vdpa_get_vring_num(struct vhost_vdpa *v, u16 __user *argp) | |
429 | { | |
430 | struct vdpa_device *vdpa = v->vdpa; | |
431 | const struct vdpa_config_ops *ops = vdpa->config; | |
432 | u16 num; | |
433 | ||
434 | num = ops->get_vq_num_max(vdpa); | |
435 | ||
436 | if (copy_to_user(argp, &num, sizeof(num))) | |
437 | return -EFAULT; | |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
776f3950 ZL |
442 | static void vhost_vdpa_config_put(struct vhost_vdpa *v) |
443 | { | |
f6bbf001 | 444 | if (v->config_ctx) { |
776f3950 | 445 | eventfd_ctx_put(v->config_ctx); |
f6bbf001 SG |
446 | v->config_ctx = NULL; |
447 | } | |
776f3950 ZL |
448 | } |
449 | ||
450 | static long vhost_vdpa_set_config_call(struct vhost_vdpa *v, u32 __user *argp) | |
451 | { | |
452 | struct vdpa_callback cb; | |
453 | int fd; | |
454 | struct eventfd_ctx *ctx; | |
455 | ||
456 | cb.callback = vhost_vdpa_config_cb; | |
bcef9356 | 457 | cb.private = v; |
776f3950 ZL |
458 | if (copy_from_user(&fd, argp, sizeof(fd))) |
459 | return -EFAULT; | |
460 | ||
461 | ctx = fd == VHOST_FILE_UNBIND ? NULL : eventfd_ctx_fdget(fd); | |
462 | swap(ctx, v->config_ctx); | |
463 | ||
464 | if (!IS_ERR_OR_NULL(ctx)) | |
465 | eventfd_ctx_put(ctx); | |
466 | ||
0bde59c1 SG |
467 | if (IS_ERR(v->config_ctx)) { |
468 | long ret = PTR_ERR(v->config_ctx); | |
469 | ||
470 | v->config_ctx = NULL; | |
471 | return ret; | |
472 | } | |
776f3950 ZL |
473 | |
474 | v->vdpa->config->set_config_cb(v->vdpa, &cb); | |
475 | ||
476 | return 0; | |
477 | } | |
2cf1ba9a | 478 | |
1b48dc03 JW |
479 | static long vhost_vdpa_get_iova_range(struct vhost_vdpa *v, u32 __user *argp) |
480 | { | |
481 | struct vhost_vdpa_iova_range range = { | |
482 | .first = v->range.first, | |
483 | .last = v->range.last, | |
484 | }; | |
485 | ||
2c602741 DC |
486 | if (copy_to_user(argp, &range, sizeof(range))) |
487 | return -EFAULT; | |
488 | return 0; | |
1b48dc03 JW |
489 | } |
490 | ||
a61280dd L |
491 | static long vhost_vdpa_get_config_size(struct vhost_vdpa *v, u32 __user *argp) |
492 | { | |
493 | struct vdpa_device *vdpa = v->vdpa; | |
494 | const struct vdpa_config_ops *ops = vdpa->config; | |
495 | u32 size; | |
496 | ||
497 | size = ops->get_config_size(vdpa); | |
498 | ||
499 | if (copy_to_user(argp, &size, sizeof(size))) | |
500 | return -EFAULT; | |
501 | ||
502 | return 0; | |
503 | } | |
504 | ||
b04d910a L |
505 | static long vhost_vdpa_get_vqs_count(struct vhost_vdpa *v, u32 __user *argp) |
506 | { | |
507 | struct vdpa_device *vdpa = v->vdpa; | |
508 | ||
509 | if (copy_to_user(argp, &vdpa->nvqs, sizeof(vdpa->nvqs))) | |
510 | return -EFAULT; | |
511 | ||
512 | return 0; | |
513 | } | |
514 | ||
f345a014 EP |
515 | /* After a successful return of ioctl the device must not process more |
516 | * virtqueue descriptors. The device can answer to read or writes of config | |
517 | * fields as if it were not suspended. In particular, writing to "queue_enable" | |
518 | * with a value of 1 will not make the device start processing buffers. | |
519 | */ | |
520 | static long vhost_vdpa_suspend(struct vhost_vdpa *v) | |
521 | { | |
522 | struct vdpa_device *vdpa = v->vdpa; | |
523 | const struct vdpa_config_ops *ops = vdpa->config; | |
524 | ||
525 | if (!ops->suspend) | |
526 | return -EOPNOTSUPP; | |
527 | ||
528 | return ops->suspend(vdpa); | |
529 | } | |
530 | ||
3b688d7a SB |
531 | /* After a successful return of this ioctl the device resumes processing |
532 | * virtqueue descriptors. The device becomes fully operational the same way it | |
533 | * was before it was suspended. | |
534 | */ | |
535 | static long vhost_vdpa_resume(struct vhost_vdpa *v) | |
536 | { | |
537 | struct vdpa_device *vdpa = v->vdpa; | |
538 | const struct vdpa_config_ops *ops = vdpa->config; | |
539 | ||
540 | if (!ops->resume) | |
541 | return -EOPNOTSUPP; | |
542 | ||
543 | return ops->resume(vdpa); | |
544 | } | |
545 | ||
4c8cf318 TB |
546 | static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd, |
547 | void __user *argp) | |
548 | { | |
549 | struct vdpa_device *vdpa = v->vdpa; | |
550 | const struct vdpa_config_ops *ops = vdpa->config; | |
aac50c0b | 551 | struct vdpa_vq_state vq_state; |
4c8cf318 TB |
552 | struct vdpa_callback cb; |
553 | struct vhost_virtqueue *vq; | |
554 | struct vhost_vring_state s; | |
4c8cf318 TB |
555 | u32 idx; |
556 | long r; | |
557 | ||
558 | r = get_user(idx, (u32 __user *)argp); | |
559 | if (r < 0) | |
560 | return r; | |
561 | ||
562 | if (idx >= v->nvqs) | |
563 | return -ENOBUFS; | |
564 | ||
565 | idx = array_index_nospec(idx, v->nvqs); | |
566 | vq = &v->vqs[idx]; | |
567 | ||
b0bd82bf JW |
568 | switch (cmd) { |
569 | case VHOST_VDPA_SET_VRING_ENABLE: | |
4c8cf318 TB |
570 | if (copy_from_user(&s, argp, sizeof(s))) |
571 | return -EFAULT; | |
572 | ops->set_vq_ready(vdpa, idx, s.num); | |
573 | return 0; | |
2d1fcb77 | 574 | case VHOST_VDPA_GET_VRING_GROUP: |
00d1f546 JW |
575 | if (!ops->get_vq_group) |
576 | return -EOPNOTSUPP; | |
2d1fcb77 GD |
577 | s.index = idx; |
578 | s.num = ops->get_vq_group(vdpa, idx); | |
579 | if (s.num >= vdpa->ngroups) | |
580 | return -EIO; | |
581 | else if (copy_to_user(argp, &s, sizeof(s))) | |
582 | return -EFAULT; | |
583 | return 0; | |
84d7c8fd GD |
584 | case VHOST_VDPA_SET_GROUP_ASID: |
585 | if (copy_from_user(&s, argp, sizeof(s))) | |
586 | return -EFAULT; | |
587 | if (s.num >= vdpa->nas) | |
588 | return -EINVAL; | |
589 | if (!ops->set_group_asid) | |
590 | return -EOPNOTSUPP; | |
591 | return ops->set_group_asid(vdpa, idx, s.num); | |
b0bd82bf | 592 | case VHOST_GET_VRING_BASE: |
23750e39 EC |
593 | r = ops->get_vq_state(v->vdpa, idx, &vq_state); |
594 | if (r) | |
595 | return r; | |
596 | ||
530a5678 | 597 | vq->last_avail_idx = vq_state.split.avail_index; |
b0bd82bf JW |
598 | break; |
599 | } | |
4c8cf318 TB |
600 | |
601 | r = vhost_vring_ioctl(&v->vdev, cmd, argp); | |
602 | if (r) | |
603 | return r; | |
604 | ||
605 | switch (cmd) { | |
606 | case VHOST_SET_VRING_ADDR: | |
607 | if (ops->set_vq_address(vdpa, idx, | |
608 | (u64)(uintptr_t)vq->desc, | |
609 | (u64)(uintptr_t)vq->avail, | |
610 | (u64)(uintptr_t)vq->used)) | |
611 | r = -EINVAL; | |
612 | break; | |
613 | ||
614 | case VHOST_SET_VRING_BASE: | |
530a5678 | 615 | vq_state.split.avail_index = vq->last_avail_idx; |
aac50c0b | 616 | if (ops->set_vq_state(vdpa, idx, &vq_state)) |
4c8cf318 TB |
617 | r = -EINVAL; |
618 | break; | |
619 | ||
620 | case VHOST_SET_VRING_CALL: | |
265a0ad8 | 621 | if (vq->call_ctx.ctx) { |
4c8cf318 TB |
622 | cb.callback = vhost_vdpa_virtqueue_cb; |
623 | cb.private = vq; | |
5e68470f | 624 | cb.trigger = vq->call_ctx.ctx; |
4c8cf318 TB |
625 | } else { |
626 | cb.callback = NULL; | |
627 | cb.private = NULL; | |
5e68470f | 628 | cb.trigger = NULL; |
4c8cf318 TB |
629 | } |
630 | ops->set_vq_cb(vdpa, idx, &cb); | |
2cf1ba9a | 631 | vhost_vdpa_setup_vq_irq(v, idx); |
4c8cf318 TB |
632 | break; |
633 | ||
634 | case VHOST_SET_VRING_NUM: | |
635 | ops->set_vq_num(vdpa, idx, vq->num); | |
636 | break; | |
637 | } | |
638 | ||
639 | return r; | |
640 | } | |
641 | ||
642 | static long vhost_vdpa_unlocked_ioctl(struct file *filep, | |
643 | unsigned int cmd, unsigned long arg) | |
644 | { | |
645 | struct vhost_vdpa *v = filep->private_data; | |
646 | struct vhost_dev *d = &v->vdev; | |
647 | void __user *argp = (void __user *)arg; | |
a127c5bb JW |
648 | u64 __user *featurep = argp; |
649 | u64 features; | |
7922460e | 650 | long r = 0; |
4c8cf318 | 651 | |
a127c5bb | 652 | if (cmd == VHOST_SET_BACKEND_FEATURES) { |
7922460e DC |
653 | if (copy_from_user(&features, featurep, sizeof(features))) |
654 | return -EFAULT; | |
0723f1df | 655 | if (features & ~(VHOST_VDPA_BACKEND_FEATURES | |
69106b6f SB |
656 | BIT_ULL(VHOST_BACKEND_F_SUSPEND) | |
657 | BIT_ULL(VHOST_BACKEND_F_RESUME))) | |
0723f1df EP |
658 | return -EOPNOTSUPP; |
659 | if ((features & BIT_ULL(VHOST_BACKEND_F_SUSPEND)) && | |
660 | !vhost_vdpa_can_suspend(v)) | |
a127c5bb | 661 | return -EOPNOTSUPP; |
69106b6f SB |
662 | if ((features & BIT_ULL(VHOST_BACKEND_F_RESUME)) && |
663 | !vhost_vdpa_can_resume(v)) | |
664 | return -EOPNOTSUPP; | |
a127c5bb JW |
665 | vhost_set_backend_features(&v->vdev, features); |
666 | return 0; | |
667 | } | |
668 | ||
4c8cf318 TB |
669 | mutex_lock(&d->mutex); |
670 | ||
671 | switch (cmd) { | |
672 | case VHOST_VDPA_GET_DEVICE_ID: | |
673 | r = vhost_vdpa_get_device_id(v, argp); | |
674 | break; | |
675 | case VHOST_VDPA_GET_STATUS: | |
676 | r = vhost_vdpa_get_status(v, argp); | |
677 | break; | |
678 | case VHOST_VDPA_SET_STATUS: | |
679 | r = vhost_vdpa_set_status(v, argp); | |
680 | break; | |
681 | case VHOST_VDPA_GET_CONFIG: | |
682 | r = vhost_vdpa_get_config(v, argp); | |
683 | break; | |
684 | case VHOST_VDPA_SET_CONFIG: | |
685 | r = vhost_vdpa_set_config(v, argp); | |
686 | break; | |
687 | case VHOST_GET_FEATURES: | |
688 | r = vhost_vdpa_get_features(v, argp); | |
689 | break; | |
690 | case VHOST_SET_FEATURES: | |
691 | r = vhost_vdpa_set_features(v, argp); | |
692 | break; | |
693 | case VHOST_VDPA_GET_VRING_NUM: | |
694 | r = vhost_vdpa_get_vring_num(v, argp); | |
695 | break; | |
3ace88bd | 696 | case VHOST_VDPA_GET_GROUP_NUM: |
f4a8686e DC |
697 | if (copy_to_user(argp, &v->vdpa->ngroups, |
698 | sizeof(v->vdpa->ngroups))) | |
699 | r = -EFAULT; | |
3ace88bd | 700 | break; |
a0c95f20 | 701 | case VHOST_VDPA_GET_AS_NUM: |
f4a8686e DC |
702 | if (copy_to_user(argp, &v->vdpa->nas, sizeof(v->vdpa->nas))) |
703 | r = -EFAULT; | |
a0c95f20 | 704 | break; |
4c8cf318 TB |
705 | case VHOST_SET_LOG_BASE: |
706 | case VHOST_SET_LOG_FD: | |
707 | r = -ENOIOCTLCMD; | |
708 | break; | |
776f3950 ZL |
709 | case VHOST_VDPA_SET_CONFIG_CALL: |
710 | r = vhost_vdpa_set_config_call(v, argp); | |
711 | break; | |
a127c5bb JW |
712 | case VHOST_GET_BACKEND_FEATURES: |
713 | features = VHOST_VDPA_BACKEND_FEATURES; | |
0723f1df EP |
714 | if (vhost_vdpa_can_suspend(v)) |
715 | features |= BIT_ULL(VHOST_BACKEND_F_SUSPEND); | |
69106b6f SB |
716 | if (vhost_vdpa_can_resume(v)) |
717 | features |= BIT_ULL(VHOST_BACKEND_F_RESUME); | |
7922460e DC |
718 | if (copy_to_user(featurep, &features, sizeof(features))) |
719 | r = -EFAULT; | |
a127c5bb | 720 | break; |
1b48dc03 JW |
721 | case VHOST_VDPA_GET_IOVA_RANGE: |
722 | r = vhost_vdpa_get_iova_range(v, argp); | |
723 | break; | |
a61280dd L |
724 | case VHOST_VDPA_GET_CONFIG_SIZE: |
725 | r = vhost_vdpa_get_config_size(v, argp); | |
726 | break; | |
b04d910a L |
727 | case VHOST_VDPA_GET_VQS_COUNT: |
728 | r = vhost_vdpa_get_vqs_count(v, argp); | |
729 | break; | |
f345a014 EP |
730 | case VHOST_VDPA_SUSPEND: |
731 | r = vhost_vdpa_suspend(v); | |
732 | break; | |
3b688d7a SB |
733 | case VHOST_VDPA_RESUME: |
734 | r = vhost_vdpa_resume(v); | |
735 | break; | |
4c8cf318 TB |
736 | default: |
737 | r = vhost_dev_ioctl(&v->vdev, cmd, argp); | |
738 | if (r == -ENOIOCTLCMD) | |
739 | r = vhost_vdpa_vring_ioctl(v, cmd, argp); | |
740 | break; | |
741 | } | |
742 | ||
9067de47 SG |
743 | if (r) |
744 | goto out; | |
745 | ||
746 | switch (cmd) { | |
747 | case VHOST_SET_OWNER: | |
748 | r = vhost_vdpa_bind_mm(v); | |
749 | if (r) | |
750 | vhost_dev_reset_owner(d, NULL); | |
751 | break; | |
752 | } | |
753 | out: | |
4c8cf318 TB |
754 | mutex_unlock(&d->mutex); |
755 | return r; | |
756 | } | |
e794070a CL |
757 | static void vhost_vdpa_general_unmap(struct vhost_vdpa *v, |
758 | struct vhost_iotlb_map *map, u32 asid) | |
759 | { | |
760 | struct vdpa_device *vdpa = v->vdpa; | |
761 | const struct vdpa_config_ops *ops = vdpa->config; | |
762 | if (ops->dma_map) { | |
763 | ops->dma_unmap(vdpa, asid, map->start, map->size); | |
764 | } else if (ops->set_map == NULL) { | |
765 | iommu_unmap(v->domain, map->start, map->size); | |
766 | } | |
767 | } | |
4c8cf318 | 768 | |
e794070a CL |
769 | static void vhost_vdpa_pa_unmap(struct vhost_vdpa *v, struct vhost_iotlb *iotlb, |
770 | u64 start, u64 last, u32 asid) | |
4c8cf318 TB |
771 | { |
772 | struct vhost_dev *dev = &v->vdev; | |
4c8cf318 TB |
773 | struct vhost_iotlb_map *map; |
774 | struct page *page; | |
775 | unsigned long pfn, pinned; | |
776 | ||
777 | while ((map = vhost_iotlb_itree_first(iotlb, start, last)) != NULL) { | |
729ce5a5 CH |
778 | pinned = PFN_DOWN(map->size); |
779 | for (pfn = PFN_DOWN(map->addr); | |
4c8cf318 TB |
780 | pinned > 0; pfn++, pinned--) { |
781 | page = pfn_to_page(pfn); | |
782 | if (map->perm & VHOST_ACCESS_WO) | |
783 | set_page_dirty_lock(page); | |
784 | unpin_user_page(page); | |
785 | } | |
729ce5a5 | 786 | atomic64_sub(PFN_DOWN(map->size), &dev->mm->pinned_vm); |
e794070a | 787 | vhost_vdpa_general_unmap(v, map, asid); |
4c8cf318 TB |
788 | vhost_iotlb_map_free(iotlb, map); |
789 | } | |
790 | } | |
791 | ||
e794070a CL |
792 | static void vhost_vdpa_va_unmap(struct vhost_vdpa *v, struct vhost_iotlb *iotlb, |
793 | u64 start, u64 last, u32 asid) | |
d8945ec4 | 794 | { |
d8945ec4 XY |
795 | struct vhost_iotlb_map *map; |
796 | struct vdpa_map_file *map_file; | |
797 | ||
798 | while ((map = vhost_iotlb_itree_first(iotlb, start, last)) != NULL) { | |
799 | map_file = (struct vdpa_map_file *)map->opaque; | |
800 | fput(map_file->file); | |
801 | kfree(map_file); | |
e794070a | 802 | vhost_vdpa_general_unmap(v, map, asid); |
d8945ec4 XY |
803 | vhost_iotlb_map_free(iotlb, map); |
804 | } | |
805 | } | |
806 | ||
ae967246 | 807 | static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v, |
e794070a CL |
808 | struct vhost_iotlb *iotlb, u64 start, |
809 | u64 last, u32 asid) | |
22af48cf | 810 | { |
d8945ec4 XY |
811 | struct vdpa_device *vdpa = v->vdpa; |
812 | ||
813 | if (vdpa->use_va) | |
e794070a | 814 | return vhost_vdpa_va_unmap(v, iotlb, start, last, asid); |
d8945ec4 | 815 | |
e794070a | 816 | return vhost_vdpa_pa_unmap(v, iotlb, start, last, asid); |
22af48cf XY |
817 | } |
818 | ||
4c8cf318 TB |
819 | static int perm_to_iommu_flags(u32 perm) |
820 | { | |
821 | int flags = 0; | |
822 | ||
823 | switch (perm) { | |
824 | case VHOST_ACCESS_WO: | |
825 | flags |= IOMMU_WRITE; | |
826 | break; | |
827 | case VHOST_ACCESS_RO: | |
828 | flags |= IOMMU_READ; | |
829 | break; | |
830 | case VHOST_ACCESS_RW: | |
831 | flags |= (IOMMU_WRITE | IOMMU_READ); | |
832 | break; | |
833 | default: | |
834 | WARN(1, "invalidate vhost IOTLB permission\n"); | |
835 | break; | |
836 | } | |
837 | ||
838 | return flags | IOMMU_CACHE; | |
839 | } | |
840 | ||
ae967246 GD |
841 | static int vhost_vdpa_map(struct vhost_vdpa *v, struct vhost_iotlb *iotlb, |
842 | u64 iova, u64 size, u64 pa, u32 perm, void *opaque) | |
4c8cf318 TB |
843 | { |
844 | struct vhost_dev *dev = &v->vdev; | |
845 | struct vdpa_device *vdpa = v->vdpa; | |
846 | const struct vdpa_config_ops *ops = vdpa->config; | |
aaca8373 | 847 | u32 asid = iotlb_to_asid(iotlb); |
4c8cf318 TB |
848 | int r = 0; |
849 | ||
ae967246 | 850 | r = vhost_iotlb_add_range_ctx(iotlb, iova, iova + size - 1, |
d8945ec4 | 851 | pa, perm, opaque); |
4c8cf318 TB |
852 | if (r) |
853 | return r; | |
854 | ||
25abc060 | 855 | if (ops->dma_map) { |
aaca8373 | 856 | r = ops->dma_map(vdpa, asid, iova, size, pa, perm, opaque); |
25abc060 JW |
857 | } else if (ops->set_map) { |
858 | if (!v->in_batch) | |
aaca8373 | 859 | r = ops->set_map(vdpa, asid, iotlb); |
25abc060 | 860 | } else { |
4c8cf318 | 861 | r = iommu_map(v->domain, iova, pa, size, |
1369459b | 862 | perm_to_iommu_flags(perm), GFP_KERNEL); |
25abc060 | 863 | } |
d8945ec4 | 864 | if (r) { |
ae967246 | 865 | vhost_iotlb_del_range(iotlb, iova, iova + size - 1); |
d8945ec4 XY |
866 | return r; |
867 | } | |
868 | ||
869 | if (!vdpa->use_va) | |
729ce5a5 | 870 | atomic64_add(PFN_DOWN(size), &dev->mm->pinned_vm); |
1477c8ae | 871 | |
d8945ec4 | 872 | return 0; |
4c8cf318 TB |
873 | } |
874 | ||
ae967246 GD |
875 | static void vhost_vdpa_unmap(struct vhost_vdpa *v, |
876 | struct vhost_iotlb *iotlb, | |
877 | u64 iova, u64 size) | |
4c8cf318 | 878 | { |
4c8cf318 TB |
879 | struct vdpa_device *vdpa = v->vdpa; |
880 | const struct vdpa_config_ops *ops = vdpa->config; | |
aaca8373 | 881 | u32 asid = iotlb_to_asid(iotlb); |
4c8cf318 | 882 | |
e794070a | 883 | vhost_vdpa_iotlb_unmap(v, iotlb, iova, iova + size - 1, asid); |
4c8cf318 | 884 | |
e794070a | 885 | if (ops->set_map) { |
25abc060 | 886 | if (!v->in_batch) |
aaca8373 | 887 | ops->set_map(vdpa, asid, iotlb); |
25abc060 | 888 | } |
c82729e0 | 889 | |
4c8cf318 TB |
890 | } |
891 | ||
d8945ec4 | 892 | static int vhost_vdpa_va_map(struct vhost_vdpa *v, |
ae967246 | 893 | struct vhost_iotlb *iotlb, |
d8945ec4 XY |
894 | u64 iova, u64 size, u64 uaddr, u32 perm) |
895 | { | |
896 | struct vhost_dev *dev = &v->vdev; | |
897 | u64 offset, map_size, map_iova = iova; | |
898 | struct vdpa_map_file *map_file; | |
899 | struct vm_area_struct *vma; | |
be9c6bad | 900 | int ret = 0; |
d8945ec4 XY |
901 | |
902 | mmap_read_lock(dev->mm); | |
903 | ||
904 | while (size) { | |
905 | vma = find_vma(dev->mm, uaddr); | |
906 | if (!vma) { | |
907 | ret = -EINVAL; | |
908 | break; | |
909 | } | |
910 | map_size = min(size, vma->vm_end - uaddr); | |
911 | if (!(vma->vm_file && (vma->vm_flags & VM_SHARED) && | |
912 | !(vma->vm_flags & (VM_IO | VM_PFNMAP)))) | |
913 | goto next; | |
914 | ||
915 | map_file = kzalloc(sizeof(*map_file), GFP_KERNEL); | |
916 | if (!map_file) { | |
917 | ret = -ENOMEM; | |
918 | break; | |
919 | } | |
920 | offset = (vma->vm_pgoff << PAGE_SHIFT) + uaddr - vma->vm_start; | |
921 | map_file->offset = offset; | |
922 | map_file->file = get_file(vma->vm_file); | |
ae967246 | 923 | ret = vhost_vdpa_map(v, iotlb, map_iova, map_size, uaddr, |
d8945ec4 XY |
924 | perm, map_file); |
925 | if (ret) { | |
926 | fput(map_file->file); | |
927 | kfree(map_file); | |
928 | break; | |
929 | } | |
930 | next: | |
931 | size -= map_size; | |
932 | uaddr += map_size; | |
933 | map_iova += map_size; | |
934 | } | |
935 | if (ret) | |
ae967246 | 936 | vhost_vdpa_unmap(v, iotlb, iova, map_iova - iova); |
d8945ec4 XY |
937 | |
938 | mmap_read_unlock(dev->mm); | |
939 | ||
940 | return ret; | |
941 | } | |
942 | ||
22af48cf | 943 | static int vhost_vdpa_pa_map(struct vhost_vdpa *v, |
ae967246 | 944 | struct vhost_iotlb *iotlb, |
22af48cf | 945 | u64 iova, u64 size, u64 uaddr, u32 perm) |
4c8cf318 TB |
946 | { |
947 | struct vhost_dev *dev = &v->vdev; | |
4c8cf318 | 948 | struct page **page_list; |
5e1a3149 | 949 | unsigned long list_size = PAGE_SIZE / sizeof(struct page *); |
4c8cf318 | 950 | unsigned int gup_flags = FOLL_LONGTERM; |
5e1a3149 | 951 | unsigned long npages, cur_base, map_pfn, last_pfn = 0; |
ad89653f | 952 | unsigned long lock_limit, sz2pin, nchunks, i; |
22af48cf | 953 | u64 start = iova; |
ad89653f | 954 | long pinned; |
4c8cf318 TB |
955 | int ret = 0; |
956 | ||
ad89653f | 957 | /* Limit the use of memory for bookkeeping */ |
5e1a3149 MT |
958 | page_list = (struct page **) __get_free_page(GFP_KERNEL); |
959 | if (!page_list) | |
960 | return -ENOMEM; | |
961 | ||
22af48cf | 962 | if (perm & VHOST_ACCESS_WO) |
4c8cf318 TB |
963 | gup_flags |= FOLL_WRITE; |
964 | ||
22af48cf | 965 | npages = PFN_UP(size + (iova & ~PAGE_MASK)); |
ad89653f SWL |
966 | if (!npages) { |
967 | ret = -EINVAL; | |
968 | goto free; | |
969 | } | |
4c8cf318 | 970 | |
d8ed45c5 | 971 | mmap_read_lock(dev->mm); |
4c8cf318 | 972 | |
729ce5a5 | 973 | lock_limit = PFN_DOWN(rlimit(RLIMIT_MEMLOCK)); |
ad89653f | 974 | if (npages + atomic64_read(&dev->mm->pinned_vm) > lock_limit) { |
5e1a3149 | 975 | ret = -ENOMEM; |
ad89653f | 976 | goto unlock; |
7ed9e3d9 | 977 | } |
4c8cf318 | 978 | |
22af48cf | 979 | cur_base = uaddr & PAGE_MASK; |
7ed9e3d9 | 980 | iova &= PAGE_MASK; |
ad89653f | 981 | nchunks = 0; |
5e1a3149 MT |
982 | |
983 | while (npages) { | |
ad89653f SWL |
984 | sz2pin = min_t(unsigned long, npages, list_size); |
985 | pinned = pin_user_pages(cur_base, sz2pin, | |
986 | gup_flags, page_list, NULL); | |
987 | if (sz2pin != pinned) { | |
988 | if (pinned < 0) { | |
989 | ret = pinned; | |
990 | } else { | |
991 | unpin_user_pages(page_list, pinned); | |
992 | ret = -ENOMEM; | |
993 | } | |
5e1a3149 | 994 | goto out; |
ad89653f SWL |
995 | } |
996 | nchunks++; | |
5e1a3149 MT |
997 | |
998 | if (!last_pfn) | |
999 | map_pfn = page_to_pfn(page_list[0]); | |
1000 | ||
ad89653f | 1001 | for (i = 0; i < pinned; i++) { |
5e1a3149 MT |
1002 | unsigned long this_pfn = page_to_pfn(page_list[i]); |
1003 | u64 csize; | |
1004 | ||
1005 | if (last_pfn && (this_pfn != last_pfn + 1)) { | |
1006 | /* Pin a contiguous chunk of memory */ | |
729ce5a5 | 1007 | csize = PFN_PHYS(last_pfn - map_pfn + 1); |
ae967246 | 1008 | ret = vhost_vdpa_map(v, iotlb, iova, csize, |
729ce5a5 | 1009 | PFN_PHYS(map_pfn), |
d8945ec4 | 1010 | perm, NULL); |
ad89653f SWL |
1011 | if (ret) { |
1012 | /* | |
1013 | * Unpin the pages that are left unmapped | |
1014 | * from this point on in the current | |
1015 | * page_list. The remaining outstanding | |
1016 | * ones which may stride across several | |
1017 | * chunks will be covered in the common | |
1018 | * error path subsequently. | |
1019 | */ | |
1020 | unpin_user_pages(&page_list[i], | |
1021 | pinned - i); | |
5e1a3149 | 1022 | goto out; |
ad89653f SWL |
1023 | } |
1024 | ||
5e1a3149 MT |
1025 | map_pfn = this_pfn; |
1026 | iova += csize; | |
ad89653f | 1027 | nchunks = 0; |
4c8cf318 | 1028 | } |
5e1a3149 MT |
1029 | |
1030 | last_pfn = this_pfn; | |
4c8cf318 | 1031 | } |
5e1a3149 | 1032 | |
729ce5a5 | 1033 | cur_base += PFN_PHYS(pinned); |
ad89653f | 1034 | npages -= pinned; |
4c8cf318 TB |
1035 | } |
1036 | ||
5e1a3149 | 1037 | /* Pin the rest chunk */ |
ae967246 | 1038 | ret = vhost_vdpa_map(v, iotlb, iova, PFN_PHYS(last_pfn - map_pfn + 1), |
d8945ec4 | 1039 | PFN_PHYS(map_pfn), perm, NULL); |
4c8cf318 | 1040 | out: |
5e1a3149 | 1041 | if (ret) { |
ad89653f SWL |
1042 | if (nchunks) { |
1043 | unsigned long pfn; | |
1044 | ||
1045 | /* | |
1046 | * Unpin the outstanding pages which are yet to be | |
1047 | * mapped but haven't due to vdpa_map() or | |
1048 | * pin_user_pages() failure. | |
1049 | * | |
1050 | * Mapped pages are accounted in vdpa_map(), hence | |
1051 | * the corresponding unpinning will be handled by | |
1052 | * vdpa_unmap(). | |
1053 | */ | |
1054 | WARN_ON(!last_pfn); | |
1055 | for (pfn = map_pfn; pfn <= last_pfn; pfn++) | |
1056 | unpin_user_page(pfn_to_page(pfn)); | |
1057 | } | |
ae967246 | 1058 | vhost_vdpa_unmap(v, iotlb, start, size); |
5e1a3149 | 1059 | } |
ad89653f | 1060 | unlock: |
d8ed45c5 | 1061 | mmap_read_unlock(dev->mm); |
ad89653f | 1062 | free: |
5e1a3149 | 1063 | free_page((unsigned long)page_list); |
4c8cf318 | 1064 | return ret; |
22af48cf XY |
1065 | |
1066 | } | |
1067 | ||
1068 | static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v, | |
ae967246 | 1069 | struct vhost_iotlb *iotlb, |
22af48cf XY |
1070 | struct vhost_iotlb_msg *msg) |
1071 | { | |
d8945ec4 | 1072 | struct vdpa_device *vdpa = v->vdpa; |
22af48cf XY |
1073 | |
1074 | if (msg->iova < v->range.first || !msg->size || | |
1075 | msg->iova > U64_MAX - msg->size + 1 || | |
1076 | msg->iova + msg->size - 1 > v->range.last) | |
1077 | return -EINVAL; | |
1078 | ||
1079 | if (vhost_iotlb_itree_first(iotlb, msg->iova, | |
1080 | msg->iova + msg->size - 1)) | |
1081 | return -EEXIST; | |
1082 | ||
d8945ec4 | 1083 | if (vdpa->use_va) |
ae967246 | 1084 | return vhost_vdpa_va_map(v, iotlb, msg->iova, msg->size, |
d8945ec4 XY |
1085 | msg->uaddr, msg->perm); |
1086 | ||
ae967246 | 1087 | return vhost_vdpa_pa_map(v, iotlb, msg->iova, msg->size, msg->uaddr, |
22af48cf | 1088 | msg->perm); |
4c8cf318 TB |
1089 | } |
1090 | ||
91233ad7 | 1091 | static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev, u32 asid, |
4c8cf318 TB |
1092 | struct vhost_iotlb_msg *msg) |
1093 | { | |
1094 | struct vhost_vdpa *v = container_of(dev, struct vhost_vdpa, vdev); | |
25abc060 JW |
1095 | struct vdpa_device *vdpa = v->vdpa; |
1096 | const struct vdpa_config_ops *ops = vdpa->config; | |
aaca8373 GD |
1097 | struct vhost_iotlb *iotlb = NULL; |
1098 | struct vhost_vdpa_as *as = NULL; | |
4c8cf318 TB |
1099 | int r = 0; |
1100 | ||
a9d06452 XY |
1101 | mutex_lock(&dev->mutex); |
1102 | ||
4c8cf318 TB |
1103 | r = vhost_dev_check_owner(dev); |
1104 | if (r) | |
a9d06452 | 1105 | goto unlock; |
4c8cf318 | 1106 | |
aaca8373 GD |
1107 | if (msg->type == VHOST_IOTLB_UPDATE || |
1108 | msg->type == VHOST_IOTLB_BATCH_BEGIN) { | |
1109 | as = vhost_vdpa_find_alloc_as(v, asid); | |
1110 | if (!as) { | |
1111 | dev_err(&v->dev, "can't find and alloc asid %d\n", | |
1112 | asid); | |
1113 | r = -EINVAL; | |
1114 | goto unlock; | |
1115 | } | |
1116 | iotlb = &as->iotlb; | |
1117 | } else | |
1118 | iotlb = asid_to_iotlb(v, asid); | |
1119 | ||
1120 | if ((v->in_batch && v->batch_asid != asid) || !iotlb) { | |
1121 | if (v->in_batch && v->batch_asid != asid) { | |
1122 | dev_info(&v->dev, "batch id %d asid %d\n", | |
1123 | v->batch_asid, asid); | |
1124 | } | |
1125 | if (!iotlb) | |
1126 | dev_err(&v->dev, "no iotlb for asid %d\n", asid); | |
1127 | r = -EINVAL; | |
1128 | goto unlock; | |
1129 | } | |
1130 | ||
4c8cf318 TB |
1131 | switch (msg->type) { |
1132 | case VHOST_IOTLB_UPDATE: | |
ae967246 | 1133 | r = vhost_vdpa_process_iotlb_update(v, iotlb, msg); |
4c8cf318 TB |
1134 | break; |
1135 | case VHOST_IOTLB_INVALIDATE: | |
ae967246 | 1136 | vhost_vdpa_unmap(v, iotlb, msg->iova, msg->size); |
4c8cf318 | 1137 | break; |
25abc060 | 1138 | case VHOST_IOTLB_BATCH_BEGIN: |
aaca8373 | 1139 | v->batch_asid = asid; |
25abc060 JW |
1140 | v->in_batch = true; |
1141 | break; | |
1142 | case VHOST_IOTLB_BATCH_END: | |
1143 | if (v->in_batch && ops->set_map) | |
aaca8373 | 1144 | ops->set_map(vdpa, asid, iotlb); |
25abc060 JW |
1145 | v->in_batch = false; |
1146 | break; | |
4c8cf318 TB |
1147 | default: |
1148 | r = -EINVAL; | |
1149 | break; | |
1150 | } | |
a9d06452 XY |
1151 | unlock: |
1152 | mutex_unlock(&dev->mutex); | |
4c8cf318 TB |
1153 | |
1154 | return r; | |
1155 | } | |
1156 | ||
1157 | static ssize_t vhost_vdpa_chr_write_iter(struct kiocb *iocb, | |
1158 | struct iov_iter *from) | |
1159 | { | |
1160 | struct file *file = iocb->ki_filp; | |
1161 | struct vhost_vdpa *v = file->private_data; | |
1162 | struct vhost_dev *dev = &v->vdev; | |
1163 | ||
1164 | return vhost_chr_write_iter(dev, from); | |
1165 | } | |
1166 | ||
1167 | static int vhost_vdpa_alloc_domain(struct vhost_vdpa *v) | |
1168 | { | |
1169 | struct vdpa_device *vdpa = v->vdpa; | |
1170 | const struct vdpa_config_ops *ops = vdpa->config; | |
1171 | struct device *dma_dev = vdpa_get_dma_dev(vdpa); | |
94a11504 | 1172 | const struct bus_type *bus; |
4c8cf318 TB |
1173 | int ret; |
1174 | ||
1175 | /* Device want to do DMA by itself */ | |
1176 | if (ops->set_map || ops->dma_map) | |
1177 | return 0; | |
1178 | ||
1179 | bus = dma_dev->bus; | |
1180 | if (!bus) | |
1181 | return -EFAULT; | |
1182 | ||
6830a6ab AK |
1183 | if (!device_iommu_capable(dma_dev, IOMMU_CAP_CACHE_COHERENCY)) { |
1184 | dev_warn_once(&v->dev, | |
1185 | "Failed to allocate domain, device is not IOMMU cache coherent capable\n"); | |
4c8cf318 | 1186 | return -ENOTSUPP; |
6830a6ab | 1187 | } |
4c8cf318 TB |
1188 | |
1189 | v->domain = iommu_domain_alloc(bus); | |
1190 | if (!v->domain) | |
1191 | return -EIO; | |
1192 | ||
1193 | ret = iommu_attach_device(v->domain, dma_dev); | |
1194 | if (ret) | |
1195 | goto err_attach; | |
1196 | ||
1197 | return 0; | |
1198 | ||
1199 | err_attach: | |
1200 | iommu_domain_free(v->domain); | |
5a522150 | 1201 | v->domain = NULL; |
4c8cf318 TB |
1202 | return ret; |
1203 | } | |
1204 | ||
1205 | static void vhost_vdpa_free_domain(struct vhost_vdpa *v) | |
1206 | { | |
1207 | struct vdpa_device *vdpa = v->vdpa; | |
1208 | struct device *dma_dev = vdpa_get_dma_dev(vdpa); | |
1209 | ||
1210 | if (v->domain) { | |
1211 | iommu_detach_device(v->domain, dma_dev); | |
1212 | iommu_domain_free(v->domain); | |
1213 | } | |
1214 | ||
1215 | v->domain = NULL; | |
1216 | } | |
1217 | ||
1b48dc03 JW |
1218 | static void vhost_vdpa_set_iova_range(struct vhost_vdpa *v) |
1219 | { | |
1220 | struct vdpa_iova_range *range = &v->range; | |
1b48dc03 JW |
1221 | struct vdpa_device *vdpa = v->vdpa; |
1222 | const struct vdpa_config_ops *ops = vdpa->config; | |
1223 | ||
1224 | if (ops->get_iova_range) { | |
1225 | *range = ops->get_iova_range(vdpa); | |
bc9a05ee CH |
1226 | } else if (v->domain && v->domain->geometry.force_aperture) { |
1227 | range->first = v->domain->geometry.aperture_start; | |
1228 | range->last = v->domain->geometry.aperture_end; | |
1b48dc03 JW |
1229 | } else { |
1230 | range->first = 0; | |
1231 | range->last = ULLONG_MAX; | |
1232 | } | |
1233 | } | |
1234 | ||
3d569879 GD |
1235 | static void vhost_vdpa_cleanup(struct vhost_vdpa *v) |
1236 | { | |
aaca8373 GD |
1237 | struct vhost_vdpa_as *as; |
1238 | u32 asid; | |
1239 | ||
aaca8373 GD |
1240 | for (asid = 0; asid < v->vdpa->nas; asid++) { |
1241 | as = asid_to_as(v, asid); | |
1242 | if (as) | |
1243 | vhost_vdpa_remove_as(v, asid); | |
1244 | } | |
c070c191 | 1245 | |
5a522150 | 1246 | vhost_vdpa_free_domain(v); |
c070c191 SG |
1247 | vhost_dev_cleanup(&v->vdev); |
1248 | kfree(v->vdev.vqs); | |
3d569879 GD |
1249 | } |
1250 | ||
4c8cf318 TB |
1251 | static int vhost_vdpa_open(struct inode *inode, struct file *filep) |
1252 | { | |
1253 | struct vhost_vdpa *v; | |
1254 | struct vhost_dev *dev; | |
1255 | struct vhost_virtqueue **vqs; | |
81d46d69 L |
1256 | int r, opened; |
1257 | u32 i, nvqs; | |
4c8cf318 TB |
1258 | |
1259 | v = container_of(inode->i_cdev, struct vhost_vdpa, cdev); | |
4c8cf318 TB |
1260 | |
1261 | opened = atomic_cmpxchg(&v->opened, 0, 1); | |
1262 | if (opened) | |
1263 | return -EBUSY; | |
1264 | ||
1265 | nvqs = v->nvqs; | |
7f05630d XY |
1266 | r = vhost_vdpa_reset(v); |
1267 | if (r) | |
1268 | goto err; | |
4c8cf318 TB |
1269 | |
1270 | vqs = kmalloc_array(nvqs, sizeof(*vqs), GFP_KERNEL); | |
1271 | if (!vqs) { | |
1272 | r = -ENOMEM; | |
1273 | goto err; | |
1274 | } | |
1275 | ||
1276 | dev = &v->vdev; | |
1277 | for (i = 0; i < nvqs; i++) { | |
1278 | vqs[i] = &v->vqs[i]; | |
1279 | vqs[i]->handle_kick = handle_vq_kick; | |
1280 | } | |
01fcb1cb | 1281 | vhost_dev_init(dev, vqs, nvqs, 0, 0, 0, false, |
4c8cf318 TB |
1282 | vhost_vdpa_process_iotlb_msg); |
1283 | ||
4c8cf318 TB |
1284 | r = vhost_vdpa_alloc_domain(v); |
1285 | if (r) | |
aaca8373 | 1286 | goto err_alloc_domain; |
4c8cf318 | 1287 | |
1b48dc03 JW |
1288 | vhost_vdpa_set_iova_range(v); |
1289 | ||
4c8cf318 TB |
1290 | filep->private_data = v; |
1291 | ||
1292 | return 0; | |
1293 | ||
aaca8373 | 1294 | err_alloc_domain: |
3d569879 | 1295 | vhost_vdpa_cleanup(v); |
4c8cf318 TB |
1296 | err: |
1297 | atomic_dec(&v->opened); | |
1298 | return r; | |
1299 | } | |
1300 | ||
2cf1ba9a ZL |
1301 | static void vhost_vdpa_clean_irq(struct vhost_vdpa *v) |
1302 | { | |
81d46d69 | 1303 | u32 i; |
2cf1ba9a | 1304 | |
4c050286 GD |
1305 | for (i = 0; i < v->nvqs; i++) |
1306 | vhost_vdpa_unsetup_vq_irq(v, i); | |
2cf1ba9a ZL |
1307 | } |
1308 | ||
4c8cf318 TB |
1309 | static int vhost_vdpa_release(struct inode *inode, struct file *filep) |
1310 | { | |
1311 | struct vhost_vdpa *v = filep->private_data; | |
1312 | struct vhost_dev *d = &v->vdev; | |
1313 | ||
1314 | mutex_lock(&d->mutex); | |
1315 | filep->private_data = NULL; | |
ea8f17e4 | 1316 | vhost_vdpa_clean_irq(v); |
4c8cf318 TB |
1317 | vhost_vdpa_reset(v); |
1318 | vhost_dev_stop(&v->vdev); | |
9067de47 | 1319 | vhost_vdpa_unbind_mm(v); |
776f3950 | 1320 | vhost_vdpa_config_put(v); |
037d4305 | 1321 | vhost_vdpa_cleanup(v); |
4c8cf318 TB |
1322 | mutex_unlock(&d->mutex); |
1323 | ||
1324 | atomic_dec(&v->opened); | |
1325 | complete(&v->completion); | |
1326 | ||
1327 | return 0; | |
1328 | } | |
1329 | ||
4b4e4867 | 1330 | #ifdef CONFIG_MMU |
ddd89d0a JW |
1331 | static vm_fault_t vhost_vdpa_fault(struct vm_fault *vmf) |
1332 | { | |
1333 | struct vhost_vdpa *v = vmf->vma->vm_file->private_data; | |
1334 | struct vdpa_device *vdpa = v->vdpa; | |
1335 | const struct vdpa_config_ops *ops = vdpa->config; | |
1336 | struct vdpa_notification_area notify; | |
1337 | struct vm_area_struct *vma = vmf->vma; | |
1338 | u16 index = vma->vm_pgoff; | |
1339 | ||
1340 | notify = ops->get_vq_notification(vdpa, index); | |
1341 | ||
1342 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
1343 | if (remap_pfn_range(vma, vmf->address & PAGE_MASK, | |
729ce5a5 | 1344 | PFN_DOWN(notify.addr), PAGE_SIZE, |
ddd89d0a JW |
1345 | vma->vm_page_prot)) |
1346 | return VM_FAULT_SIGBUS; | |
1347 | ||
1348 | return VM_FAULT_NOPAGE; | |
1349 | } | |
1350 | ||
1351 | static const struct vm_operations_struct vhost_vdpa_vm_ops = { | |
1352 | .fault = vhost_vdpa_fault, | |
1353 | }; | |
1354 | ||
1355 | static int vhost_vdpa_mmap(struct file *file, struct vm_area_struct *vma) | |
1356 | { | |
1357 | struct vhost_vdpa *v = vma->vm_file->private_data; | |
1358 | struct vdpa_device *vdpa = v->vdpa; | |
1359 | const struct vdpa_config_ops *ops = vdpa->config; | |
1360 | struct vdpa_notification_area notify; | |
c09cc2c3 | 1361 | unsigned long index = vma->vm_pgoff; |
ddd89d0a JW |
1362 | |
1363 | if (vma->vm_end - vma->vm_start != PAGE_SIZE) | |
1364 | return -EINVAL; | |
1365 | if ((vma->vm_flags & VM_SHARED) == 0) | |
1366 | return -EINVAL; | |
1367 | if (vma->vm_flags & VM_READ) | |
1368 | return -EINVAL; | |
1369 | if (index > 65535) | |
1370 | return -EINVAL; | |
1371 | if (!ops->get_vq_notification) | |
1372 | return -ENOTSUPP; | |
1373 | ||
1374 | /* To be safe and easily modelled by userspace, We only | |
1375 | * support the doorbell which sits on the page boundary and | |
1376 | * does not share the page with other registers. | |
1377 | */ | |
1378 | notify = ops->get_vq_notification(vdpa, index); | |
1379 | if (notify.addr & (PAGE_SIZE - 1)) | |
1380 | return -EINVAL; | |
1381 | if (vma->vm_end - vma->vm_start != notify.size) | |
1382 | return -ENOTSUPP; | |
1383 | ||
1c71222e | 1384 | vm_flags_set(vma, VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP); |
ddd89d0a JW |
1385 | vma->vm_ops = &vhost_vdpa_vm_ops; |
1386 | return 0; | |
1387 | } | |
4b4e4867 | 1388 | #endif /* CONFIG_MMU */ |
ddd89d0a | 1389 | |
4c8cf318 TB |
1390 | static const struct file_operations vhost_vdpa_fops = { |
1391 | .owner = THIS_MODULE, | |
1392 | .open = vhost_vdpa_open, | |
1393 | .release = vhost_vdpa_release, | |
1394 | .write_iter = vhost_vdpa_chr_write_iter, | |
1395 | .unlocked_ioctl = vhost_vdpa_unlocked_ioctl, | |
4b4e4867 | 1396 | #ifdef CONFIG_MMU |
ddd89d0a | 1397 | .mmap = vhost_vdpa_mmap, |
4b4e4867 | 1398 | #endif /* CONFIG_MMU */ |
4c8cf318 TB |
1399 | .compat_ioctl = compat_ptr_ioctl, |
1400 | }; | |
1401 | ||
1402 | static void vhost_vdpa_release_dev(struct device *device) | |
1403 | { | |
1404 | struct vhost_vdpa *v = | |
1405 | container_of(device, struct vhost_vdpa, dev); | |
1406 | ||
1407 | ida_simple_remove(&vhost_vdpa_ida, v->minor); | |
1408 | kfree(v->vqs); | |
1409 | kfree(v); | |
1410 | } | |
1411 | ||
1412 | static int vhost_vdpa_probe(struct vdpa_device *vdpa) | |
1413 | { | |
1414 | const struct vdpa_config_ops *ops = vdpa->config; | |
1415 | struct vhost_vdpa *v; | |
a9974489 | 1416 | int minor; |
3d569879 | 1417 | int i, r; |
4c8cf318 | 1418 | |
aaca8373 GD |
1419 | /* We can't support platform IOMMU device with more than 1 |
1420 | * group or as | |
1421 | */ | |
1422 | if (!ops->set_map && !ops->dma_map && | |
1423 | (vdpa->ngroups > 1 || vdpa->nas > 1)) | |
db9adcbf GD |
1424 | return -EOPNOTSUPP; |
1425 | ||
4c8cf318 TB |
1426 | v = kzalloc(sizeof(*v), GFP_KERNEL | __GFP_RETRY_MAYFAIL); |
1427 | if (!v) | |
1428 | return -ENOMEM; | |
1429 | ||
1430 | minor = ida_simple_get(&vhost_vdpa_ida, 0, | |
1431 | VHOST_VDPA_DEV_MAX, GFP_KERNEL); | |
1432 | if (minor < 0) { | |
1433 | kfree(v); | |
1434 | return minor; | |
1435 | } | |
1436 | ||
1437 | atomic_set(&v->opened, 0); | |
1438 | v->minor = minor; | |
1439 | v->vdpa = vdpa; | |
a9974489 | 1440 | v->nvqs = vdpa->nvqs; |
4c8cf318 TB |
1441 | v->virtio_id = ops->get_device_id(vdpa); |
1442 | ||
1443 | device_initialize(&v->dev); | |
1444 | v->dev.release = vhost_vdpa_release_dev; | |
1445 | v->dev.parent = &vdpa->dev; | |
1446 | v->dev.devt = MKDEV(MAJOR(vhost_vdpa_major), minor); | |
a9974489 | 1447 | v->vqs = kmalloc_array(v->nvqs, sizeof(struct vhost_virtqueue), |
4c8cf318 TB |
1448 | GFP_KERNEL); |
1449 | if (!v->vqs) { | |
1450 | r = -ENOMEM; | |
1451 | goto err; | |
1452 | } | |
1453 | ||
1454 | r = dev_set_name(&v->dev, "vhost-vdpa-%u", minor); | |
1455 | if (r) | |
1456 | goto err; | |
1457 | ||
1458 | cdev_init(&v->cdev, &vhost_vdpa_fops); | |
1459 | v->cdev.owner = THIS_MODULE; | |
1460 | ||
1461 | r = cdev_device_add(&v->cdev, &v->dev); | |
1462 | if (r) | |
1463 | goto err; | |
1464 | ||
1465 | init_completion(&v->completion); | |
1466 | vdpa_set_drvdata(vdpa, v); | |
1467 | ||
3d569879 GD |
1468 | for (i = 0; i < VHOST_VDPA_IOTLB_BUCKETS; i++) |
1469 | INIT_HLIST_HEAD(&v->as[i]); | |
1470 | ||
4c8cf318 TB |
1471 | return 0; |
1472 | ||
1473 | err: | |
1474 | put_device(&v->dev); | |
ebe6a354 | 1475 | ida_simple_remove(&vhost_vdpa_ida, v->minor); |
4c8cf318 TB |
1476 | return r; |
1477 | } | |
1478 | ||
1479 | static void vhost_vdpa_remove(struct vdpa_device *vdpa) | |
1480 | { | |
1481 | struct vhost_vdpa *v = vdpa_get_drvdata(vdpa); | |
1482 | int opened; | |
1483 | ||
1484 | cdev_device_del(&v->cdev, &v->dev); | |
1485 | ||
1486 | do { | |
1487 | opened = atomic_cmpxchg(&v->opened, 0, 1); | |
1488 | if (!opened) | |
1489 | break; | |
1490 | wait_for_completion(&v->completion); | |
1491 | } while (1); | |
1492 | ||
1493 | put_device(&v->dev); | |
1494 | } | |
1495 | ||
1496 | static struct vdpa_driver vhost_vdpa_driver = { | |
1497 | .driver = { | |
1498 | .name = "vhost_vdpa", | |
1499 | }, | |
1500 | .probe = vhost_vdpa_probe, | |
1501 | .remove = vhost_vdpa_remove, | |
1502 | }; | |
1503 | ||
1504 | static int __init vhost_vdpa_init(void) | |
1505 | { | |
1506 | int r; | |
1507 | ||
1508 | r = alloc_chrdev_region(&vhost_vdpa_major, 0, VHOST_VDPA_DEV_MAX, | |
1509 | "vhost-vdpa"); | |
1510 | if (r) | |
1511 | goto err_alloc_chrdev; | |
1512 | ||
1513 | r = vdpa_register_driver(&vhost_vdpa_driver); | |
1514 | if (r) | |
1515 | goto err_vdpa_register_driver; | |
1516 | ||
1517 | return 0; | |
1518 | ||
1519 | err_vdpa_register_driver: | |
1520 | unregister_chrdev_region(vhost_vdpa_major, VHOST_VDPA_DEV_MAX); | |
1521 | err_alloc_chrdev: | |
1522 | return r; | |
1523 | } | |
1524 | module_init(vhost_vdpa_init); | |
1525 | ||
1526 | static void __exit vhost_vdpa_exit(void) | |
1527 | { | |
1528 | vdpa_unregister_driver(&vhost_vdpa_driver); | |
1529 | unregister_chrdev_region(vhost_vdpa_major, VHOST_VDPA_DEV_MAX); | |
1530 | } | |
1531 | module_exit(vhost_vdpa_exit); | |
1532 | ||
1533 | MODULE_VERSION("0.0.1"); | |
1534 | MODULE_LICENSE("GPL v2"); | |
1535 | MODULE_AUTHOR("Intel Corporation"); | |
1536 | MODULE_DESCRIPTION("vDPA-based vhost backend for virtio"); |