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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 | ||
aaca8373 GD |
68 | static inline u32 iotlb_to_asid(struct vhost_iotlb *iotlb) |
69 | { | |
70 | struct vhost_vdpa_as *as = container_of(iotlb, struct | |
71 | vhost_vdpa_as, iotlb); | |
72 | return as->id; | |
73 | } | |
74 | ||
3d569879 GD |
75 | static struct vhost_vdpa_as *asid_to_as(struct vhost_vdpa *v, u32 asid) |
76 | { | |
77 | struct hlist_head *head = &v->as[asid % VHOST_VDPA_IOTLB_BUCKETS]; | |
78 | struct vhost_vdpa_as *as; | |
79 | ||
80 | hlist_for_each_entry(as, head, hash_link) | |
81 | if (as->id == asid) | |
82 | return as; | |
83 | ||
84 | return NULL; | |
85 | } | |
86 | ||
aaca8373 GD |
87 | static struct vhost_iotlb *asid_to_iotlb(struct vhost_vdpa *v, u32 asid) |
88 | { | |
89 | struct vhost_vdpa_as *as = asid_to_as(v, asid); | |
90 | ||
91 | if (!as) | |
92 | return NULL; | |
93 | ||
94 | return &as->iotlb; | |
95 | } | |
96 | ||
3d569879 GD |
97 | static struct vhost_vdpa_as *vhost_vdpa_alloc_as(struct vhost_vdpa *v, u32 asid) |
98 | { | |
99 | struct hlist_head *head = &v->as[asid % VHOST_VDPA_IOTLB_BUCKETS]; | |
100 | struct vhost_vdpa_as *as; | |
101 | ||
102 | if (asid_to_as(v, asid)) | |
103 | return NULL; | |
104 | ||
aaca8373 GD |
105 | if (asid >= v->vdpa->nas) |
106 | return NULL; | |
107 | ||
3d569879 GD |
108 | as = kmalloc(sizeof(*as), GFP_KERNEL); |
109 | if (!as) | |
110 | return NULL; | |
111 | ||
112 | vhost_iotlb_init(&as->iotlb, 0, 0); | |
113 | as->id = asid; | |
114 | hlist_add_head(&as->hash_link, head); | |
115 | ||
116 | return as; | |
117 | } | |
118 | ||
aaca8373 GD |
119 | static struct vhost_vdpa_as *vhost_vdpa_find_alloc_as(struct vhost_vdpa *v, |
120 | u32 asid) | |
121 | { | |
122 | struct vhost_vdpa_as *as = asid_to_as(v, asid); | |
123 | ||
124 | if (as) | |
125 | return as; | |
126 | ||
127 | return vhost_vdpa_alloc_as(v, asid); | |
128 | } | |
129 | ||
3d569879 GD |
130 | static int vhost_vdpa_remove_as(struct vhost_vdpa *v, u32 asid) |
131 | { | |
132 | struct vhost_vdpa_as *as = asid_to_as(v, asid); | |
133 | ||
134 | if (!as) | |
135 | return -EINVAL; | |
136 | ||
137 | hlist_del(&as->hash_link); | |
138 | vhost_iotlb_reset(&as->iotlb); | |
139 | kfree(as); | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
4c8cf318 TB |
144 | static void handle_vq_kick(struct vhost_work *work) |
145 | { | |
146 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, | |
147 | poll.work); | |
148 | struct vhost_vdpa *v = container_of(vq->dev, struct vhost_vdpa, vdev); | |
149 | const struct vdpa_config_ops *ops = v->vdpa->config; | |
150 | ||
151 | ops->kick_vq(v->vdpa, vq - v->vqs); | |
152 | } | |
153 | ||
154 | static irqreturn_t vhost_vdpa_virtqueue_cb(void *private) | |
155 | { | |
156 | struct vhost_virtqueue *vq = private; | |
265a0ad8 | 157 | struct eventfd_ctx *call_ctx = vq->call_ctx.ctx; |
4c8cf318 TB |
158 | |
159 | if (call_ctx) | |
160 | eventfd_signal(call_ctx, 1); | |
161 | ||
162 | return IRQ_HANDLED; | |
163 | } | |
164 | ||
776f3950 ZL |
165 | static irqreturn_t vhost_vdpa_config_cb(void *private) |
166 | { | |
167 | struct vhost_vdpa *v = private; | |
168 | struct eventfd_ctx *config_ctx = v->config_ctx; | |
169 | ||
170 | if (config_ctx) | |
171 | eventfd_signal(config_ctx, 1); | |
172 | ||
173 | return IRQ_HANDLED; | |
174 | } | |
175 | ||
2cf1ba9a ZL |
176 | static void vhost_vdpa_setup_vq_irq(struct vhost_vdpa *v, u16 qid) |
177 | { | |
178 | struct vhost_virtqueue *vq = &v->vqs[qid]; | |
179 | const struct vdpa_config_ops *ops = v->vdpa->config; | |
180 | struct vdpa_device *vdpa = v->vdpa; | |
181 | int ret, irq; | |
182 | ||
183 | if (!ops->get_vq_irq) | |
184 | return; | |
185 | ||
186 | irq = ops->get_vq_irq(vdpa, qid); | |
cce0ab2b ZL |
187 | if (irq < 0) |
188 | return; | |
189 | ||
2cf1ba9a | 190 | irq_bypass_unregister_producer(&vq->call_ctx.producer); |
cce0ab2b | 191 | if (!vq->call_ctx.ctx) |
2cf1ba9a | 192 | return; |
2cf1ba9a ZL |
193 | |
194 | vq->call_ctx.producer.token = vq->call_ctx.ctx; | |
195 | vq->call_ctx.producer.irq = irq; | |
196 | ret = irq_bypass_register_producer(&vq->call_ctx.producer); | |
e01afe36 ZL |
197 | if (unlikely(ret)) |
198 | dev_info(&v->dev, "vq %u, irq bypass producer (token %p) registration fails, ret = %d\n", | |
199 | qid, vq->call_ctx.producer.token, ret); | |
2cf1ba9a ZL |
200 | } |
201 | ||
202 | static void vhost_vdpa_unsetup_vq_irq(struct vhost_vdpa *v, u16 qid) | |
203 | { | |
204 | struct vhost_virtqueue *vq = &v->vqs[qid]; | |
205 | ||
2cf1ba9a | 206 | irq_bypass_unregister_producer(&vq->call_ctx.producer); |
2cf1ba9a ZL |
207 | } |
208 | ||
7f05630d | 209 | static int vhost_vdpa_reset(struct vhost_vdpa *v) |
4c8cf318 TB |
210 | { |
211 | struct vdpa_device *vdpa = v->vdpa; | |
4c8cf318 | 212 | |
25abc060 | 213 | v->in_batch = 0; |
7f05630d XY |
214 | |
215 | return vdpa_reset(vdpa); | |
4c8cf318 TB |
216 | } |
217 | ||
218 | static long vhost_vdpa_get_device_id(struct vhost_vdpa *v, u8 __user *argp) | |
219 | { | |
220 | struct vdpa_device *vdpa = v->vdpa; | |
221 | const struct vdpa_config_ops *ops = vdpa->config; | |
222 | u32 device_id; | |
223 | ||
224 | device_id = ops->get_device_id(vdpa); | |
225 | ||
226 | if (copy_to_user(argp, &device_id, sizeof(device_id))) | |
227 | return -EFAULT; | |
228 | ||
229 | return 0; | |
230 | } | |
231 | ||
232 | static long vhost_vdpa_get_status(struct vhost_vdpa *v, u8 __user *statusp) | |
233 | { | |
234 | struct vdpa_device *vdpa = v->vdpa; | |
f6d955d8 | 235 | const struct vdpa_config_ops *ops = vdpa->config; |
4c8cf318 TB |
236 | u8 status; |
237 | ||
f6d955d8 | 238 | status = ops->get_status(vdpa); |
4c8cf318 TB |
239 | |
240 | if (copy_to_user(statusp, &status, sizeof(status))) | |
241 | return -EFAULT; | |
242 | ||
243 | return 0; | |
244 | } | |
245 | ||
246 | static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp) | |
247 | { | |
248 | struct vdpa_device *vdpa = v->vdpa; | |
249 | const struct vdpa_config_ops *ops = vdpa->config; | |
2cf1ba9a | 250 | u8 status, status_old; |
81d46d69 L |
251 | u32 nvqs = v->nvqs; |
252 | int ret; | |
2cf1ba9a | 253 | u16 i; |
4c8cf318 TB |
254 | |
255 | if (copy_from_user(&status, statusp, sizeof(status))) | |
256 | return -EFAULT; | |
257 | ||
f6d955d8 | 258 | status_old = ops->get_status(vdpa); |
2cf1ba9a | 259 | |
4c8cf318 TB |
260 | /* |
261 | * Userspace shouldn't remove status bits unless reset the | |
262 | * status to 0. | |
263 | */ | |
23118b09 | 264 | if (status != 0 && (status_old & ~status) != 0) |
4c8cf318 TB |
265 | return -EINVAL; |
266 | ||
97f854be WZ |
267 | if ((status_old & VIRTIO_CONFIG_S_DRIVER_OK) && !(status & VIRTIO_CONFIG_S_DRIVER_OK)) |
268 | for (i = 0; i < nvqs; i++) | |
269 | vhost_vdpa_unsetup_vq_irq(v, i); | |
270 | ||
0686082d | 271 | if (status == 0) { |
680ab9d6 | 272 | ret = vdpa_reset(vdpa); |
0686082d XY |
273 | if (ret) |
274 | return ret; | |
275 | } else | |
73bc0dbb | 276 | vdpa_set_status(vdpa, status); |
4c8cf318 | 277 | |
2cf1ba9a ZL |
278 | if ((status & VIRTIO_CONFIG_S_DRIVER_OK) && !(status_old & VIRTIO_CONFIG_S_DRIVER_OK)) |
279 | for (i = 0; i < nvqs; i++) | |
280 | vhost_vdpa_setup_vq_irq(v, i); | |
281 | ||
4c8cf318 TB |
282 | return 0; |
283 | } | |
284 | ||
285 | static int vhost_vdpa_config_validate(struct vhost_vdpa *v, | |
286 | struct vhost_vdpa_config *c) | |
287 | { | |
d6d8bb92 | 288 | struct vdpa_device *vdpa = v->vdpa; |
870aaff9 | 289 | size_t size = vdpa->config->get_config_size(vdpa); |
4c8cf318 | 290 | |
3ed21c14 | 291 | if (c->len == 0 || c->off > size) |
4c8cf318 TB |
292 | return -EINVAL; |
293 | ||
294 | if (c->len > size - c->off) | |
295 | return -E2BIG; | |
296 | ||
297 | return 0; | |
298 | } | |
299 | ||
300 | static long vhost_vdpa_get_config(struct vhost_vdpa *v, | |
301 | struct vhost_vdpa_config __user *c) | |
302 | { | |
303 | struct vdpa_device *vdpa = v->vdpa; | |
4c8cf318 TB |
304 | struct vhost_vdpa_config config; |
305 | unsigned long size = offsetof(struct vhost_vdpa_config, buf); | |
306 | u8 *buf; | |
307 | ||
308 | if (copy_from_user(&config, c, size)) | |
309 | return -EFAULT; | |
310 | if (vhost_vdpa_config_validate(v, &config)) | |
311 | return -EINVAL; | |
312 | buf = kvzalloc(config.len, GFP_KERNEL); | |
313 | if (!buf) | |
314 | return -ENOMEM; | |
315 | ||
0d234007 | 316 | vdpa_get_config(vdpa, config.off, buf, config.len); |
4c8cf318 TB |
317 | |
318 | if (copy_to_user(c->buf, buf, config.len)) { | |
319 | kvfree(buf); | |
320 | return -EFAULT; | |
321 | } | |
322 | ||
323 | kvfree(buf); | |
324 | return 0; | |
325 | } | |
326 | ||
327 | static long vhost_vdpa_set_config(struct vhost_vdpa *v, | |
328 | struct vhost_vdpa_config __user *c) | |
329 | { | |
330 | struct vdpa_device *vdpa = v->vdpa; | |
4c8cf318 TB |
331 | struct vhost_vdpa_config config; |
332 | unsigned long size = offsetof(struct vhost_vdpa_config, buf); | |
333 | u8 *buf; | |
334 | ||
335 | if (copy_from_user(&config, c, size)) | |
336 | return -EFAULT; | |
337 | if (vhost_vdpa_config_validate(v, &config)) | |
338 | return -EINVAL; | |
4c8cf318 | 339 | |
0ab4b890 TT |
340 | buf = vmemdup_user(c->buf, config.len); |
341 | if (IS_ERR(buf)) | |
342 | return PTR_ERR(buf); | |
4c8cf318 | 343 | |
6dbb1f16 | 344 | vdpa_set_config(vdpa, config.off, buf, config.len); |
4c8cf318 TB |
345 | |
346 | kvfree(buf); | |
347 | return 0; | |
348 | } | |
349 | ||
350 | static long vhost_vdpa_get_features(struct vhost_vdpa *v, u64 __user *featurep) | |
351 | { | |
352 | struct vdpa_device *vdpa = v->vdpa; | |
353 | const struct vdpa_config_ops *ops = vdpa->config; | |
354 | u64 features; | |
355 | ||
a64917bc | 356 | features = ops->get_device_features(vdpa); |
4c8cf318 TB |
357 | |
358 | if (copy_to_user(featurep, &features, sizeof(features))) | |
359 | return -EFAULT; | |
360 | ||
361 | return 0; | |
362 | } | |
363 | ||
364 | static long vhost_vdpa_set_features(struct vhost_vdpa *v, u64 __user *featurep) | |
365 | { | |
366 | struct vdpa_device *vdpa = v->vdpa; | |
367 | const struct vdpa_config_ops *ops = vdpa->config; | |
368 | u64 features; | |
369 | ||
370 | /* | |
371 | * It's not allowed to change the features after they have | |
372 | * been negotiated. | |
373 | */ | |
374 | if (ops->get_status(vdpa) & VIRTIO_CONFIG_S_FEATURES_OK) | |
375 | return -EBUSY; | |
376 | ||
377 | if (copy_from_user(&features, featurep, sizeof(features))) | |
378 | return -EFAULT; | |
379 | ||
e0077cc1 | 380 | if (vdpa_set_features(vdpa, features)) |
4c8cf318 TB |
381 | return -EINVAL; |
382 | ||
383 | return 0; | |
384 | } | |
385 | ||
386 | static long vhost_vdpa_get_vring_num(struct vhost_vdpa *v, u16 __user *argp) | |
387 | { | |
388 | struct vdpa_device *vdpa = v->vdpa; | |
389 | const struct vdpa_config_ops *ops = vdpa->config; | |
390 | u16 num; | |
391 | ||
392 | num = ops->get_vq_num_max(vdpa); | |
393 | ||
394 | if (copy_to_user(argp, &num, sizeof(num))) | |
395 | return -EFAULT; | |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
776f3950 ZL |
400 | static void vhost_vdpa_config_put(struct vhost_vdpa *v) |
401 | { | |
f6bbf001 | 402 | if (v->config_ctx) { |
776f3950 | 403 | eventfd_ctx_put(v->config_ctx); |
f6bbf001 SG |
404 | v->config_ctx = NULL; |
405 | } | |
776f3950 ZL |
406 | } |
407 | ||
408 | static long vhost_vdpa_set_config_call(struct vhost_vdpa *v, u32 __user *argp) | |
409 | { | |
410 | struct vdpa_callback cb; | |
411 | int fd; | |
412 | struct eventfd_ctx *ctx; | |
413 | ||
414 | cb.callback = vhost_vdpa_config_cb; | |
bcef9356 | 415 | cb.private = v; |
776f3950 ZL |
416 | if (copy_from_user(&fd, argp, sizeof(fd))) |
417 | return -EFAULT; | |
418 | ||
419 | ctx = fd == VHOST_FILE_UNBIND ? NULL : eventfd_ctx_fdget(fd); | |
420 | swap(ctx, v->config_ctx); | |
421 | ||
422 | if (!IS_ERR_OR_NULL(ctx)) | |
423 | eventfd_ctx_put(ctx); | |
424 | ||
0bde59c1 SG |
425 | if (IS_ERR(v->config_ctx)) { |
426 | long ret = PTR_ERR(v->config_ctx); | |
427 | ||
428 | v->config_ctx = NULL; | |
429 | return ret; | |
430 | } | |
776f3950 ZL |
431 | |
432 | v->vdpa->config->set_config_cb(v->vdpa, &cb); | |
433 | ||
434 | return 0; | |
435 | } | |
2cf1ba9a | 436 | |
1b48dc03 JW |
437 | static long vhost_vdpa_get_iova_range(struct vhost_vdpa *v, u32 __user *argp) |
438 | { | |
439 | struct vhost_vdpa_iova_range range = { | |
440 | .first = v->range.first, | |
441 | .last = v->range.last, | |
442 | }; | |
443 | ||
2c602741 DC |
444 | if (copy_to_user(argp, &range, sizeof(range))) |
445 | return -EFAULT; | |
446 | return 0; | |
1b48dc03 JW |
447 | } |
448 | ||
a61280dd L |
449 | static long vhost_vdpa_get_config_size(struct vhost_vdpa *v, u32 __user *argp) |
450 | { | |
451 | struct vdpa_device *vdpa = v->vdpa; | |
452 | const struct vdpa_config_ops *ops = vdpa->config; | |
453 | u32 size; | |
454 | ||
455 | size = ops->get_config_size(vdpa); | |
456 | ||
457 | if (copy_to_user(argp, &size, sizeof(size))) | |
458 | return -EFAULT; | |
459 | ||
460 | return 0; | |
461 | } | |
462 | ||
b04d910a L |
463 | static long vhost_vdpa_get_vqs_count(struct vhost_vdpa *v, u32 __user *argp) |
464 | { | |
465 | struct vdpa_device *vdpa = v->vdpa; | |
466 | ||
467 | if (copy_to_user(argp, &vdpa->nvqs, sizeof(vdpa->nvqs))) | |
468 | return -EFAULT; | |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
4c8cf318 TB |
473 | static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd, |
474 | void __user *argp) | |
475 | { | |
476 | struct vdpa_device *vdpa = v->vdpa; | |
477 | const struct vdpa_config_ops *ops = vdpa->config; | |
aac50c0b | 478 | struct vdpa_vq_state vq_state; |
4c8cf318 TB |
479 | struct vdpa_callback cb; |
480 | struct vhost_virtqueue *vq; | |
481 | struct vhost_vring_state s; | |
4c8cf318 TB |
482 | u32 idx; |
483 | long r; | |
484 | ||
485 | r = get_user(idx, (u32 __user *)argp); | |
486 | if (r < 0) | |
487 | return r; | |
488 | ||
489 | if (idx >= v->nvqs) | |
490 | return -ENOBUFS; | |
491 | ||
492 | idx = array_index_nospec(idx, v->nvqs); | |
493 | vq = &v->vqs[idx]; | |
494 | ||
b0bd82bf JW |
495 | switch (cmd) { |
496 | case VHOST_VDPA_SET_VRING_ENABLE: | |
4c8cf318 TB |
497 | if (copy_from_user(&s, argp, sizeof(s))) |
498 | return -EFAULT; | |
499 | ops->set_vq_ready(vdpa, idx, s.num); | |
500 | return 0; | |
2d1fcb77 | 501 | case VHOST_VDPA_GET_VRING_GROUP: |
00d1f546 JW |
502 | if (!ops->get_vq_group) |
503 | return -EOPNOTSUPP; | |
2d1fcb77 GD |
504 | s.index = idx; |
505 | s.num = ops->get_vq_group(vdpa, idx); | |
506 | if (s.num >= vdpa->ngroups) | |
507 | return -EIO; | |
508 | else if (copy_to_user(argp, &s, sizeof(s))) | |
509 | return -EFAULT; | |
510 | return 0; | |
84d7c8fd GD |
511 | case VHOST_VDPA_SET_GROUP_ASID: |
512 | if (copy_from_user(&s, argp, sizeof(s))) | |
513 | return -EFAULT; | |
514 | if (s.num >= vdpa->nas) | |
515 | return -EINVAL; | |
516 | if (!ops->set_group_asid) | |
517 | return -EOPNOTSUPP; | |
518 | return ops->set_group_asid(vdpa, idx, s.num); | |
b0bd82bf | 519 | case VHOST_GET_VRING_BASE: |
23750e39 EC |
520 | r = ops->get_vq_state(v->vdpa, idx, &vq_state); |
521 | if (r) | |
522 | return r; | |
523 | ||
530a5678 | 524 | vq->last_avail_idx = vq_state.split.avail_index; |
b0bd82bf JW |
525 | break; |
526 | } | |
4c8cf318 TB |
527 | |
528 | r = vhost_vring_ioctl(&v->vdev, cmd, argp); | |
529 | if (r) | |
530 | return r; | |
531 | ||
532 | switch (cmd) { | |
533 | case VHOST_SET_VRING_ADDR: | |
534 | if (ops->set_vq_address(vdpa, idx, | |
535 | (u64)(uintptr_t)vq->desc, | |
536 | (u64)(uintptr_t)vq->avail, | |
537 | (u64)(uintptr_t)vq->used)) | |
538 | r = -EINVAL; | |
539 | break; | |
540 | ||
541 | case VHOST_SET_VRING_BASE: | |
530a5678 | 542 | vq_state.split.avail_index = vq->last_avail_idx; |
aac50c0b | 543 | if (ops->set_vq_state(vdpa, idx, &vq_state)) |
4c8cf318 TB |
544 | r = -EINVAL; |
545 | break; | |
546 | ||
547 | case VHOST_SET_VRING_CALL: | |
265a0ad8 | 548 | if (vq->call_ctx.ctx) { |
4c8cf318 TB |
549 | cb.callback = vhost_vdpa_virtqueue_cb; |
550 | cb.private = vq; | |
551 | } else { | |
552 | cb.callback = NULL; | |
553 | cb.private = NULL; | |
554 | } | |
555 | ops->set_vq_cb(vdpa, idx, &cb); | |
2cf1ba9a | 556 | vhost_vdpa_setup_vq_irq(v, idx); |
4c8cf318 TB |
557 | break; |
558 | ||
559 | case VHOST_SET_VRING_NUM: | |
560 | ops->set_vq_num(vdpa, idx, vq->num); | |
561 | break; | |
562 | } | |
563 | ||
564 | return r; | |
565 | } | |
566 | ||
567 | static long vhost_vdpa_unlocked_ioctl(struct file *filep, | |
568 | unsigned int cmd, unsigned long arg) | |
569 | { | |
570 | struct vhost_vdpa *v = filep->private_data; | |
571 | struct vhost_dev *d = &v->vdev; | |
572 | void __user *argp = (void __user *)arg; | |
a127c5bb JW |
573 | u64 __user *featurep = argp; |
574 | u64 features; | |
7922460e | 575 | long r = 0; |
4c8cf318 | 576 | |
a127c5bb | 577 | if (cmd == VHOST_SET_BACKEND_FEATURES) { |
7922460e DC |
578 | if (copy_from_user(&features, featurep, sizeof(features))) |
579 | return -EFAULT; | |
a127c5bb JW |
580 | if (features & ~VHOST_VDPA_BACKEND_FEATURES) |
581 | return -EOPNOTSUPP; | |
582 | vhost_set_backend_features(&v->vdev, features); | |
583 | return 0; | |
584 | } | |
585 | ||
4c8cf318 TB |
586 | mutex_lock(&d->mutex); |
587 | ||
588 | switch (cmd) { | |
589 | case VHOST_VDPA_GET_DEVICE_ID: | |
590 | r = vhost_vdpa_get_device_id(v, argp); | |
591 | break; | |
592 | case VHOST_VDPA_GET_STATUS: | |
593 | r = vhost_vdpa_get_status(v, argp); | |
594 | break; | |
595 | case VHOST_VDPA_SET_STATUS: | |
596 | r = vhost_vdpa_set_status(v, argp); | |
597 | break; | |
598 | case VHOST_VDPA_GET_CONFIG: | |
599 | r = vhost_vdpa_get_config(v, argp); | |
600 | break; | |
601 | case VHOST_VDPA_SET_CONFIG: | |
602 | r = vhost_vdpa_set_config(v, argp); | |
603 | break; | |
604 | case VHOST_GET_FEATURES: | |
605 | r = vhost_vdpa_get_features(v, argp); | |
606 | break; | |
607 | case VHOST_SET_FEATURES: | |
608 | r = vhost_vdpa_set_features(v, argp); | |
609 | break; | |
610 | case VHOST_VDPA_GET_VRING_NUM: | |
611 | r = vhost_vdpa_get_vring_num(v, argp); | |
612 | break; | |
3ace88bd | 613 | case VHOST_VDPA_GET_GROUP_NUM: |
f4a8686e DC |
614 | if (copy_to_user(argp, &v->vdpa->ngroups, |
615 | sizeof(v->vdpa->ngroups))) | |
616 | r = -EFAULT; | |
3ace88bd | 617 | break; |
a0c95f20 | 618 | case VHOST_VDPA_GET_AS_NUM: |
f4a8686e DC |
619 | if (copy_to_user(argp, &v->vdpa->nas, sizeof(v->vdpa->nas))) |
620 | r = -EFAULT; | |
a0c95f20 | 621 | break; |
4c8cf318 TB |
622 | case VHOST_SET_LOG_BASE: |
623 | case VHOST_SET_LOG_FD: | |
624 | r = -ENOIOCTLCMD; | |
625 | break; | |
776f3950 ZL |
626 | case VHOST_VDPA_SET_CONFIG_CALL: |
627 | r = vhost_vdpa_set_config_call(v, argp); | |
628 | break; | |
a127c5bb JW |
629 | case VHOST_GET_BACKEND_FEATURES: |
630 | features = VHOST_VDPA_BACKEND_FEATURES; | |
7922460e DC |
631 | if (copy_to_user(featurep, &features, sizeof(features))) |
632 | r = -EFAULT; | |
a127c5bb | 633 | break; |
1b48dc03 JW |
634 | case VHOST_VDPA_GET_IOVA_RANGE: |
635 | r = vhost_vdpa_get_iova_range(v, argp); | |
636 | break; | |
a61280dd L |
637 | case VHOST_VDPA_GET_CONFIG_SIZE: |
638 | r = vhost_vdpa_get_config_size(v, argp); | |
639 | break; | |
b04d910a L |
640 | case VHOST_VDPA_GET_VQS_COUNT: |
641 | r = vhost_vdpa_get_vqs_count(v, argp); | |
642 | break; | |
4c8cf318 TB |
643 | default: |
644 | r = vhost_dev_ioctl(&v->vdev, cmd, argp); | |
645 | if (r == -ENOIOCTLCMD) | |
646 | r = vhost_vdpa_vring_ioctl(v, cmd, argp); | |
647 | break; | |
648 | } | |
649 | ||
650 | mutex_unlock(&d->mutex); | |
651 | return r; | |
652 | } | |
653 | ||
ae967246 GD |
654 | static void vhost_vdpa_pa_unmap(struct vhost_vdpa *v, |
655 | struct vhost_iotlb *iotlb, | |
656 | u64 start, u64 last) | |
4c8cf318 TB |
657 | { |
658 | struct vhost_dev *dev = &v->vdev; | |
4c8cf318 TB |
659 | struct vhost_iotlb_map *map; |
660 | struct page *page; | |
661 | unsigned long pfn, pinned; | |
662 | ||
663 | while ((map = vhost_iotlb_itree_first(iotlb, start, last)) != NULL) { | |
729ce5a5 CH |
664 | pinned = PFN_DOWN(map->size); |
665 | for (pfn = PFN_DOWN(map->addr); | |
4c8cf318 TB |
666 | pinned > 0; pfn++, pinned--) { |
667 | page = pfn_to_page(pfn); | |
668 | if (map->perm & VHOST_ACCESS_WO) | |
669 | set_page_dirty_lock(page); | |
670 | unpin_user_page(page); | |
671 | } | |
729ce5a5 | 672 | atomic64_sub(PFN_DOWN(map->size), &dev->mm->pinned_vm); |
4c8cf318 TB |
673 | vhost_iotlb_map_free(iotlb, map); |
674 | } | |
675 | } | |
676 | ||
ae967246 GD |
677 | static void vhost_vdpa_va_unmap(struct vhost_vdpa *v, |
678 | struct vhost_iotlb *iotlb, | |
679 | u64 start, u64 last) | |
d8945ec4 | 680 | { |
d8945ec4 XY |
681 | struct vhost_iotlb_map *map; |
682 | struct vdpa_map_file *map_file; | |
683 | ||
684 | while ((map = vhost_iotlb_itree_first(iotlb, start, last)) != NULL) { | |
685 | map_file = (struct vdpa_map_file *)map->opaque; | |
686 | fput(map_file->file); | |
687 | kfree(map_file); | |
688 | vhost_iotlb_map_free(iotlb, map); | |
689 | } | |
690 | } | |
691 | ||
ae967246 GD |
692 | static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v, |
693 | struct vhost_iotlb *iotlb, | |
694 | u64 start, u64 last) | |
22af48cf | 695 | { |
d8945ec4 XY |
696 | struct vdpa_device *vdpa = v->vdpa; |
697 | ||
698 | if (vdpa->use_va) | |
ae967246 | 699 | return vhost_vdpa_va_unmap(v, iotlb, start, last); |
d8945ec4 | 700 | |
ae967246 | 701 | return vhost_vdpa_pa_unmap(v, iotlb, start, last); |
22af48cf XY |
702 | } |
703 | ||
4c8cf318 TB |
704 | static int perm_to_iommu_flags(u32 perm) |
705 | { | |
706 | int flags = 0; | |
707 | ||
708 | switch (perm) { | |
709 | case VHOST_ACCESS_WO: | |
710 | flags |= IOMMU_WRITE; | |
711 | break; | |
712 | case VHOST_ACCESS_RO: | |
713 | flags |= IOMMU_READ; | |
714 | break; | |
715 | case VHOST_ACCESS_RW: | |
716 | flags |= (IOMMU_WRITE | IOMMU_READ); | |
717 | break; | |
718 | default: | |
719 | WARN(1, "invalidate vhost IOTLB permission\n"); | |
720 | break; | |
721 | } | |
722 | ||
723 | return flags | IOMMU_CACHE; | |
724 | } | |
725 | ||
ae967246 GD |
726 | static int vhost_vdpa_map(struct vhost_vdpa *v, struct vhost_iotlb *iotlb, |
727 | u64 iova, u64 size, u64 pa, u32 perm, void *opaque) | |
4c8cf318 TB |
728 | { |
729 | struct vhost_dev *dev = &v->vdev; | |
730 | struct vdpa_device *vdpa = v->vdpa; | |
731 | const struct vdpa_config_ops *ops = vdpa->config; | |
aaca8373 | 732 | u32 asid = iotlb_to_asid(iotlb); |
4c8cf318 TB |
733 | int r = 0; |
734 | ||
ae967246 | 735 | r = vhost_iotlb_add_range_ctx(iotlb, iova, iova + size - 1, |
d8945ec4 | 736 | pa, perm, opaque); |
4c8cf318 TB |
737 | if (r) |
738 | return r; | |
739 | ||
25abc060 | 740 | if (ops->dma_map) { |
aaca8373 | 741 | r = ops->dma_map(vdpa, asid, iova, size, pa, perm, opaque); |
25abc060 JW |
742 | } else if (ops->set_map) { |
743 | if (!v->in_batch) | |
aaca8373 | 744 | r = ops->set_map(vdpa, asid, iotlb); |
25abc060 | 745 | } else { |
4c8cf318 TB |
746 | r = iommu_map(v->domain, iova, pa, size, |
747 | perm_to_iommu_flags(perm)); | |
25abc060 | 748 | } |
d8945ec4 | 749 | if (r) { |
ae967246 | 750 | vhost_iotlb_del_range(iotlb, iova, iova + size - 1); |
d8945ec4 XY |
751 | return r; |
752 | } | |
753 | ||
754 | if (!vdpa->use_va) | |
729ce5a5 | 755 | atomic64_add(PFN_DOWN(size), &dev->mm->pinned_vm); |
1477c8ae | 756 | |
d8945ec4 | 757 | return 0; |
4c8cf318 TB |
758 | } |
759 | ||
ae967246 GD |
760 | static void vhost_vdpa_unmap(struct vhost_vdpa *v, |
761 | struct vhost_iotlb *iotlb, | |
762 | u64 iova, u64 size) | |
4c8cf318 | 763 | { |
4c8cf318 TB |
764 | struct vdpa_device *vdpa = v->vdpa; |
765 | const struct vdpa_config_ops *ops = vdpa->config; | |
aaca8373 | 766 | u32 asid = iotlb_to_asid(iotlb); |
4c8cf318 | 767 | |
ae967246 | 768 | vhost_vdpa_iotlb_unmap(v, iotlb, iova, iova + size - 1); |
4c8cf318 | 769 | |
25abc060 | 770 | if (ops->dma_map) { |
aaca8373 | 771 | ops->dma_unmap(vdpa, asid, iova, size); |
25abc060 JW |
772 | } else if (ops->set_map) { |
773 | if (!v->in_batch) | |
aaca8373 | 774 | ops->set_map(vdpa, asid, iotlb); |
25abc060 | 775 | } else { |
4c8cf318 | 776 | iommu_unmap(v->domain, iova, size); |
25abc060 | 777 | } |
aaca8373 GD |
778 | |
779 | /* If we are in the middle of batch processing, delay the free | |
780 | * of AS until BATCH_END. | |
781 | */ | |
782 | if (!v->in_batch && !iotlb->nmaps) | |
783 | vhost_vdpa_remove_as(v, asid); | |
4c8cf318 TB |
784 | } |
785 | ||
d8945ec4 | 786 | static int vhost_vdpa_va_map(struct vhost_vdpa *v, |
ae967246 | 787 | struct vhost_iotlb *iotlb, |
d8945ec4 XY |
788 | u64 iova, u64 size, u64 uaddr, u32 perm) |
789 | { | |
790 | struct vhost_dev *dev = &v->vdev; | |
791 | u64 offset, map_size, map_iova = iova; | |
792 | struct vdpa_map_file *map_file; | |
793 | struct vm_area_struct *vma; | |
be9c6bad | 794 | int ret = 0; |
d8945ec4 XY |
795 | |
796 | mmap_read_lock(dev->mm); | |
797 | ||
798 | while (size) { | |
799 | vma = find_vma(dev->mm, uaddr); | |
800 | if (!vma) { | |
801 | ret = -EINVAL; | |
802 | break; | |
803 | } | |
804 | map_size = min(size, vma->vm_end - uaddr); | |
805 | if (!(vma->vm_file && (vma->vm_flags & VM_SHARED) && | |
806 | !(vma->vm_flags & (VM_IO | VM_PFNMAP)))) | |
807 | goto next; | |
808 | ||
809 | map_file = kzalloc(sizeof(*map_file), GFP_KERNEL); | |
810 | if (!map_file) { | |
811 | ret = -ENOMEM; | |
812 | break; | |
813 | } | |
814 | offset = (vma->vm_pgoff << PAGE_SHIFT) + uaddr - vma->vm_start; | |
815 | map_file->offset = offset; | |
816 | map_file->file = get_file(vma->vm_file); | |
ae967246 | 817 | ret = vhost_vdpa_map(v, iotlb, map_iova, map_size, uaddr, |
d8945ec4 XY |
818 | perm, map_file); |
819 | if (ret) { | |
820 | fput(map_file->file); | |
821 | kfree(map_file); | |
822 | break; | |
823 | } | |
824 | next: | |
825 | size -= map_size; | |
826 | uaddr += map_size; | |
827 | map_iova += map_size; | |
828 | } | |
829 | if (ret) | |
ae967246 | 830 | vhost_vdpa_unmap(v, iotlb, iova, map_iova - iova); |
d8945ec4 XY |
831 | |
832 | mmap_read_unlock(dev->mm); | |
833 | ||
834 | return ret; | |
835 | } | |
836 | ||
22af48cf | 837 | static int vhost_vdpa_pa_map(struct vhost_vdpa *v, |
ae967246 | 838 | struct vhost_iotlb *iotlb, |
22af48cf | 839 | u64 iova, u64 size, u64 uaddr, u32 perm) |
4c8cf318 TB |
840 | { |
841 | struct vhost_dev *dev = &v->vdev; | |
4c8cf318 | 842 | struct page **page_list; |
5e1a3149 | 843 | unsigned long list_size = PAGE_SIZE / sizeof(struct page *); |
4c8cf318 | 844 | unsigned int gup_flags = FOLL_LONGTERM; |
5e1a3149 | 845 | unsigned long npages, cur_base, map_pfn, last_pfn = 0; |
ad89653f | 846 | unsigned long lock_limit, sz2pin, nchunks, i; |
22af48cf | 847 | u64 start = iova; |
ad89653f | 848 | long pinned; |
4c8cf318 TB |
849 | int ret = 0; |
850 | ||
ad89653f | 851 | /* Limit the use of memory for bookkeeping */ |
5e1a3149 MT |
852 | page_list = (struct page **) __get_free_page(GFP_KERNEL); |
853 | if (!page_list) | |
854 | return -ENOMEM; | |
855 | ||
22af48cf | 856 | if (perm & VHOST_ACCESS_WO) |
4c8cf318 TB |
857 | gup_flags |= FOLL_WRITE; |
858 | ||
22af48cf | 859 | npages = PFN_UP(size + (iova & ~PAGE_MASK)); |
ad89653f SWL |
860 | if (!npages) { |
861 | ret = -EINVAL; | |
862 | goto free; | |
863 | } | |
4c8cf318 | 864 | |
d8ed45c5 | 865 | mmap_read_lock(dev->mm); |
4c8cf318 | 866 | |
729ce5a5 | 867 | lock_limit = PFN_DOWN(rlimit(RLIMIT_MEMLOCK)); |
ad89653f | 868 | if (npages + atomic64_read(&dev->mm->pinned_vm) > lock_limit) { |
5e1a3149 | 869 | ret = -ENOMEM; |
ad89653f | 870 | goto unlock; |
7ed9e3d9 | 871 | } |
4c8cf318 | 872 | |
22af48cf | 873 | cur_base = uaddr & PAGE_MASK; |
7ed9e3d9 | 874 | iova &= PAGE_MASK; |
ad89653f | 875 | nchunks = 0; |
5e1a3149 MT |
876 | |
877 | while (npages) { | |
ad89653f SWL |
878 | sz2pin = min_t(unsigned long, npages, list_size); |
879 | pinned = pin_user_pages(cur_base, sz2pin, | |
880 | gup_flags, page_list, NULL); | |
881 | if (sz2pin != pinned) { | |
882 | if (pinned < 0) { | |
883 | ret = pinned; | |
884 | } else { | |
885 | unpin_user_pages(page_list, pinned); | |
886 | ret = -ENOMEM; | |
887 | } | |
5e1a3149 | 888 | goto out; |
ad89653f SWL |
889 | } |
890 | nchunks++; | |
5e1a3149 MT |
891 | |
892 | if (!last_pfn) | |
893 | map_pfn = page_to_pfn(page_list[0]); | |
894 | ||
ad89653f | 895 | for (i = 0; i < pinned; i++) { |
5e1a3149 MT |
896 | unsigned long this_pfn = page_to_pfn(page_list[i]); |
897 | u64 csize; | |
898 | ||
899 | if (last_pfn && (this_pfn != last_pfn + 1)) { | |
900 | /* Pin a contiguous chunk of memory */ | |
729ce5a5 | 901 | csize = PFN_PHYS(last_pfn - map_pfn + 1); |
ae967246 | 902 | ret = vhost_vdpa_map(v, iotlb, iova, csize, |
729ce5a5 | 903 | PFN_PHYS(map_pfn), |
d8945ec4 | 904 | perm, NULL); |
ad89653f SWL |
905 | if (ret) { |
906 | /* | |
907 | * Unpin the pages that are left unmapped | |
908 | * from this point on in the current | |
909 | * page_list. The remaining outstanding | |
910 | * ones which may stride across several | |
911 | * chunks will be covered in the common | |
912 | * error path subsequently. | |
913 | */ | |
914 | unpin_user_pages(&page_list[i], | |
915 | pinned - i); | |
5e1a3149 | 916 | goto out; |
ad89653f SWL |
917 | } |
918 | ||
5e1a3149 MT |
919 | map_pfn = this_pfn; |
920 | iova += csize; | |
ad89653f | 921 | nchunks = 0; |
4c8cf318 | 922 | } |
5e1a3149 MT |
923 | |
924 | last_pfn = this_pfn; | |
4c8cf318 | 925 | } |
5e1a3149 | 926 | |
729ce5a5 | 927 | cur_base += PFN_PHYS(pinned); |
ad89653f | 928 | npages -= pinned; |
4c8cf318 TB |
929 | } |
930 | ||
5e1a3149 | 931 | /* Pin the rest chunk */ |
ae967246 | 932 | ret = vhost_vdpa_map(v, iotlb, iova, PFN_PHYS(last_pfn - map_pfn + 1), |
d8945ec4 | 933 | PFN_PHYS(map_pfn), perm, NULL); |
4c8cf318 | 934 | out: |
5e1a3149 | 935 | if (ret) { |
ad89653f SWL |
936 | if (nchunks) { |
937 | unsigned long pfn; | |
938 | ||
939 | /* | |
940 | * Unpin the outstanding pages which are yet to be | |
941 | * mapped but haven't due to vdpa_map() or | |
942 | * pin_user_pages() failure. | |
943 | * | |
944 | * Mapped pages are accounted in vdpa_map(), hence | |
945 | * the corresponding unpinning will be handled by | |
946 | * vdpa_unmap(). | |
947 | */ | |
948 | WARN_ON(!last_pfn); | |
949 | for (pfn = map_pfn; pfn <= last_pfn; pfn++) | |
950 | unpin_user_page(pfn_to_page(pfn)); | |
951 | } | |
ae967246 | 952 | vhost_vdpa_unmap(v, iotlb, start, size); |
5e1a3149 | 953 | } |
ad89653f | 954 | unlock: |
d8ed45c5 | 955 | mmap_read_unlock(dev->mm); |
ad89653f | 956 | free: |
5e1a3149 | 957 | free_page((unsigned long)page_list); |
4c8cf318 | 958 | return ret; |
22af48cf XY |
959 | |
960 | } | |
961 | ||
962 | static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v, | |
ae967246 | 963 | struct vhost_iotlb *iotlb, |
22af48cf XY |
964 | struct vhost_iotlb_msg *msg) |
965 | { | |
d8945ec4 | 966 | struct vdpa_device *vdpa = v->vdpa; |
22af48cf XY |
967 | |
968 | if (msg->iova < v->range.first || !msg->size || | |
969 | msg->iova > U64_MAX - msg->size + 1 || | |
970 | msg->iova + msg->size - 1 > v->range.last) | |
971 | return -EINVAL; | |
972 | ||
973 | if (vhost_iotlb_itree_first(iotlb, msg->iova, | |
974 | msg->iova + msg->size - 1)) | |
975 | return -EEXIST; | |
976 | ||
d8945ec4 | 977 | if (vdpa->use_va) |
ae967246 | 978 | return vhost_vdpa_va_map(v, iotlb, msg->iova, msg->size, |
d8945ec4 XY |
979 | msg->uaddr, msg->perm); |
980 | ||
ae967246 | 981 | return vhost_vdpa_pa_map(v, iotlb, msg->iova, msg->size, msg->uaddr, |
22af48cf | 982 | msg->perm); |
4c8cf318 TB |
983 | } |
984 | ||
91233ad7 | 985 | static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev, u32 asid, |
4c8cf318 TB |
986 | struct vhost_iotlb_msg *msg) |
987 | { | |
988 | struct vhost_vdpa *v = container_of(dev, struct vhost_vdpa, vdev); | |
25abc060 JW |
989 | struct vdpa_device *vdpa = v->vdpa; |
990 | const struct vdpa_config_ops *ops = vdpa->config; | |
aaca8373 GD |
991 | struct vhost_iotlb *iotlb = NULL; |
992 | struct vhost_vdpa_as *as = NULL; | |
4c8cf318 TB |
993 | int r = 0; |
994 | ||
a9d06452 XY |
995 | mutex_lock(&dev->mutex); |
996 | ||
4c8cf318 TB |
997 | r = vhost_dev_check_owner(dev); |
998 | if (r) | |
a9d06452 | 999 | goto unlock; |
4c8cf318 | 1000 | |
aaca8373 GD |
1001 | if (msg->type == VHOST_IOTLB_UPDATE || |
1002 | msg->type == VHOST_IOTLB_BATCH_BEGIN) { | |
1003 | as = vhost_vdpa_find_alloc_as(v, asid); | |
1004 | if (!as) { | |
1005 | dev_err(&v->dev, "can't find and alloc asid %d\n", | |
1006 | asid); | |
1007 | r = -EINVAL; | |
1008 | goto unlock; | |
1009 | } | |
1010 | iotlb = &as->iotlb; | |
1011 | } else | |
1012 | iotlb = asid_to_iotlb(v, asid); | |
1013 | ||
1014 | if ((v->in_batch && v->batch_asid != asid) || !iotlb) { | |
1015 | if (v->in_batch && v->batch_asid != asid) { | |
1016 | dev_info(&v->dev, "batch id %d asid %d\n", | |
1017 | v->batch_asid, asid); | |
1018 | } | |
1019 | if (!iotlb) | |
1020 | dev_err(&v->dev, "no iotlb for asid %d\n", asid); | |
1021 | r = -EINVAL; | |
1022 | goto unlock; | |
1023 | } | |
1024 | ||
4c8cf318 TB |
1025 | switch (msg->type) { |
1026 | case VHOST_IOTLB_UPDATE: | |
ae967246 | 1027 | r = vhost_vdpa_process_iotlb_update(v, iotlb, msg); |
4c8cf318 TB |
1028 | break; |
1029 | case VHOST_IOTLB_INVALIDATE: | |
ae967246 | 1030 | vhost_vdpa_unmap(v, iotlb, msg->iova, msg->size); |
4c8cf318 | 1031 | break; |
25abc060 | 1032 | case VHOST_IOTLB_BATCH_BEGIN: |
aaca8373 | 1033 | v->batch_asid = asid; |
25abc060 JW |
1034 | v->in_batch = true; |
1035 | break; | |
1036 | case VHOST_IOTLB_BATCH_END: | |
1037 | if (v->in_batch && ops->set_map) | |
aaca8373 | 1038 | ops->set_map(vdpa, asid, iotlb); |
25abc060 | 1039 | v->in_batch = false; |
aaca8373 GD |
1040 | if (!iotlb->nmaps) |
1041 | vhost_vdpa_remove_as(v, asid); | |
25abc060 | 1042 | break; |
4c8cf318 TB |
1043 | default: |
1044 | r = -EINVAL; | |
1045 | break; | |
1046 | } | |
a9d06452 XY |
1047 | unlock: |
1048 | mutex_unlock(&dev->mutex); | |
4c8cf318 TB |
1049 | |
1050 | return r; | |
1051 | } | |
1052 | ||
1053 | static ssize_t vhost_vdpa_chr_write_iter(struct kiocb *iocb, | |
1054 | struct iov_iter *from) | |
1055 | { | |
1056 | struct file *file = iocb->ki_filp; | |
1057 | struct vhost_vdpa *v = file->private_data; | |
1058 | struct vhost_dev *dev = &v->vdev; | |
1059 | ||
1060 | return vhost_chr_write_iter(dev, from); | |
1061 | } | |
1062 | ||
1063 | static int vhost_vdpa_alloc_domain(struct vhost_vdpa *v) | |
1064 | { | |
1065 | struct vdpa_device *vdpa = v->vdpa; | |
1066 | const struct vdpa_config_ops *ops = vdpa->config; | |
1067 | struct device *dma_dev = vdpa_get_dma_dev(vdpa); | |
1068 | struct bus_type *bus; | |
1069 | int ret; | |
1070 | ||
1071 | /* Device want to do DMA by itself */ | |
1072 | if (ops->set_map || ops->dma_map) | |
1073 | return 0; | |
1074 | ||
1075 | bus = dma_dev->bus; | |
1076 | if (!bus) | |
1077 | return -EFAULT; | |
1078 | ||
366958a7 | 1079 | if (!device_iommu_capable(dma_dev, IOMMU_CAP_CACHE_COHERENCY)) |
4c8cf318 TB |
1080 | return -ENOTSUPP; |
1081 | ||
1082 | v->domain = iommu_domain_alloc(bus); | |
1083 | if (!v->domain) | |
1084 | return -EIO; | |
1085 | ||
1086 | ret = iommu_attach_device(v->domain, dma_dev); | |
1087 | if (ret) | |
1088 | goto err_attach; | |
1089 | ||
1090 | return 0; | |
1091 | ||
1092 | err_attach: | |
1093 | iommu_domain_free(v->domain); | |
1094 | return ret; | |
1095 | } | |
1096 | ||
1097 | static void vhost_vdpa_free_domain(struct vhost_vdpa *v) | |
1098 | { | |
1099 | struct vdpa_device *vdpa = v->vdpa; | |
1100 | struct device *dma_dev = vdpa_get_dma_dev(vdpa); | |
1101 | ||
1102 | if (v->domain) { | |
1103 | iommu_detach_device(v->domain, dma_dev); | |
1104 | iommu_domain_free(v->domain); | |
1105 | } | |
1106 | ||
1107 | v->domain = NULL; | |
1108 | } | |
1109 | ||
1b48dc03 JW |
1110 | static void vhost_vdpa_set_iova_range(struct vhost_vdpa *v) |
1111 | { | |
1112 | struct vdpa_iova_range *range = &v->range; | |
1b48dc03 JW |
1113 | struct vdpa_device *vdpa = v->vdpa; |
1114 | const struct vdpa_config_ops *ops = vdpa->config; | |
1115 | ||
1116 | if (ops->get_iova_range) { | |
1117 | *range = ops->get_iova_range(vdpa); | |
bc9a05ee CH |
1118 | } else if (v->domain && v->domain->geometry.force_aperture) { |
1119 | range->first = v->domain->geometry.aperture_start; | |
1120 | range->last = v->domain->geometry.aperture_end; | |
1b48dc03 JW |
1121 | } else { |
1122 | range->first = 0; | |
1123 | range->last = ULLONG_MAX; | |
1124 | } | |
1125 | } | |
1126 | ||
3d569879 GD |
1127 | static void vhost_vdpa_cleanup(struct vhost_vdpa *v) |
1128 | { | |
aaca8373 GD |
1129 | struct vhost_vdpa_as *as; |
1130 | u32 asid; | |
1131 | ||
3d569879 GD |
1132 | vhost_dev_cleanup(&v->vdev); |
1133 | kfree(v->vdev.vqs); | |
aaca8373 GD |
1134 | |
1135 | for (asid = 0; asid < v->vdpa->nas; asid++) { | |
1136 | as = asid_to_as(v, asid); | |
1137 | if (as) | |
1138 | vhost_vdpa_remove_as(v, asid); | |
1139 | } | |
3d569879 GD |
1140 | } |
1141 | ||
4c8cf318 TB |
1142 | static int vhost_vdpa_open(struct inode *inode, struct file *filep) |
1143 | { | |
1144 | struct vhost_vdpa *v; | |
1145 | struct vhost_dev *dev; | |
1146 | struct vhost_virtqueue **vqs; | |
81d46d69 L |
1147 | int r, opened; |
1148 | u32 i, nvqs; | |
4c8cf318 TB |
1149 | |
1150 | v = container_of(inode->i_cdev, struct vhost_vdpa, cdev); | |
4c8cf318 TB |
1151 | |
1152 | opened = atomic_cmpxchg(&v->opened, 0, 1); | |
1153 | if (opened) | |
1154 | return -EBUSY; | |
1155 | ||
1156 | nvqs = v->nvqs; | |
7f05630d XY |
1157 | r = vhost_vdpa_reset(v); |
1158 | if (r) | |
1159 | goto err; | |
4c8cf318 TB |
1160 | |
1161 | vqs = kmalloc_array(nvqs, sizeof(*vqs), GFP_KERNEL); | |
1162 | if (!vqs) { | |
1163 | r = -ENOMEM; | |
1164 | goto err; | |
1165 | } | |
1166 | ||
1167 | dev = &v->vdev; | |
1168 | for (i = 0; i < nvqs; i++) { | |
1169 | vqs[i] = &v->vqs[i]; | |
1170 | vqs[i]->handle_kick = handle_vq_kick; | |
1171 | } | |
01fcb1cb | 1172 | vhost_dev_init(dev, vqs, nvqs, 0, 0, 0, false, |
4c8cf318 TB |
1173 | vhost_vdpa_process_iotlb_msg); |
1174 | ||
4c8cf318 TB |
1175 | r = vhost_vdpa_alloc_domain(v); |
1176 | if (r) | |
aaca8373 | 1177 | goto err_alloc_domain; |
4c8cf318 | 1178 | |
1b48dc03 JW |
1179 | vhost_vdpa_set_iova_range(v); |
1180 | ||
4c8cf318 TB |
1181 | filep->private_data = v; |
1182 | ||
1183 | return 0; | |
1184 | ||
aaca8373 | 1185 | err_alloc_domain: |
3d569879 | 1186 | vhost_vdpa_cleanup(v); |
4c8cf318 TB |
1187 | err: |
1188 | atomic_dec(&v->opened); | |
1189 | return r; | |
1190 | } | |
1191 | ||
2cf1ba9a ZL |
1192 | static void vhost_vdpa_clean_irq(struct vhost_vdpa *v) |
1193 | { | |
81d46d69 | 1194 | u32 i; |
2cf1ba9a | 1195 | |
4c050286 GD |
1196 | for (i = 0; i < v->nvqs; i++) |
1197 | vhost_vdpa_unsetup_vq_irq(v, i); | |
2cf1ba9a ZL |
1198 | } |
1199 | ||
4c8cf318 TB |
1200 | static int vhost_vdpa_release(struct inode *inode, struct file *filep) |
1201 | { | |
1202 | struct vhost_vdpa *v = filep->private_data; | |
1203 | struct vhost_dev *d = &v->vdev; | |
1204 | ||
1205 | mutex_lock(&d->mutex); | |
1206 | filep->private_data = NULL; | |
ea8f17e4 | 1207 | vhost_vdpa_clean_irq(v); |
4c8cf318 TB |
1208 | vhost_vdpa_reset(v); |
1209 | vhost_dev_stop(&v->vdev); | |
4c8cf318 | 1210 | vhost_vdpa_free_domain(v); |
776f3950 | 1211 | vhost_vdpa_config_put(v); |
037d4305 | 1212 | vhost_vdpa_cleanup(v); |
4c8cf318 TB |
1213 | mutex_unlock(&d->mutex); |
1214 | ||
1215 | atomic_dec(&v->opened); | |
1216 | complete(&v->completion); | |
1217 | ||
1218 | return 0; | |
1219 | } | |
1220 | ||
4b4e4867 | 1221 | #ifdef CONFIG_MMU |
ddd89d0a JW |
1222 | static vm_fault_t vhost_vdpa_fault(struct vm_fault *vmf) |
1223 | { | |
1224 | struct vhost_vdpa *v = vmf->vma->vm_file->private_data; | |
1225 | struct vdpa_device *vdpa = v->vdpa; | |
1226 | const struct vdpa_config_ops *ops = vdpa->config; | |
1227 | struct vdpa_notification_area notify; | |
1228 | struct vm_area_struct *vma = vmf->vma; | |
1229 | u16 index = vma->vm_pgoff; | |
1230 | ||
1231 | notify = ops->get_vq_notification(vdpa, index); | |
1232 | ||
1233 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
1234 | if (remap_pfn_range(vma, vmf->address & PAGE_MASK, | |
729ce5a5 | 1235 | PFN_DOWN(notify.addr), PAGE_SIZE, |
ddd89d0a JW |
1236 | vma->vm_page_prot)) |
1237 | return VM_FAULT_SIGBUS; | |
1238 | ||
1239 | return VM_FAULT_NOPAGE; | |
1240 | } | |
1241 | ||
1242 | static const struct vm_operations_struct vhost_vdpa_vm_ops = { | |
1243 | .fault = vhost_vdpa_fault, | |
1244 | }; | |
1245 | ||
1246 | static int vhost_vdpa_mmap(struct file *file, struct vm_area_struct *vma) | |
1247 | { | |
1248 | struct vhost_vdpa *v = vma->vm_file->private_data; | |
1249 | struct vdpa_device *vdpa = v->vdpa; | |
1250 | const struct vdpa_config_ops *ops = vdpa->config; | |
1251 | struct vdpa_notification_area notify; | |
c09cc2c3 | 1252 | unsigned long index = vma->vm_pgoff; |
ddd89d0a JW |
1253 | |
1254 | if (vma->vm_end - vma->vm_start != PAGE_SIZE) | |
1255 | return -EINVAL; | |
1256 | if ((vma->vm_flags & VM_SHARED) == 0) | |
1257 | return -EINVAL; | |
1258 | if (vma->vm_flags & VM_READ) | |
1259 | return -EINVAL; | |
1260 | if (index > 65535) | |
1261 | return -EINVAL; | |
1262 | if (!ops->get_vq_notification) | |
1263 | return -ENOTSUPP; | |
1264 | ||
1265 | /* To be safe and easily modelled by userspace, We only | |
1266 | * support the doorbell which sits on the page boundary and | |
1267 | * does not share the page with other registers. | |
1268 | */ | |
1269 | notify = ops->get_vq_notification(vdpa, index); | |
1270 | if (notify.addr & (PAGE_SIZE - 1)) | |
1271 | return -EINVAL; | |
1272 | if (vma->vm_end - vma->vm_start != notify.size) | |
1273 | return -ENOTSUPP; | |
1274 | ||
3a3e0fad | 1275 | vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP; |
ddd89d0a JW |
1276 | vma->vm_ops = &vhost_vdpa_vm_ops; |
1277 | return 0; | |
1278 | } | |
4b4e4867 | 1279 | #endif /* CONFIG_MMU */ |
ddd89d0a | 1280 | |
4c8cf318 TB |
1281 | static const struct file_operations vhost_vdpa_fops = { |
1282 | .owner = THIS_MODULE, | |
1283 | .open = vhost_vdpa_open, | |
1284 | .release = vhost_vdpa_release, | |
1285 | .write_iter = vhost_vdpa_chr_write_iter, | |
1286 | .unlocked_ioctl = vhost_vdpa_unlocked_ioctl, | |
4b4e4867 | 1287 | #ifdef CONFIG_MMU |
ddd89d0a | 1288 | .mmap = vhost_vdpa_mmap, |
4b4e4867 | 1289 | #endif /* CONFIG_MMU */ |
4c8cf318 TB |
1290 | .compat_ioctl = compat_ptr_ioctl, |
1291 | }; | |
1292 | ||
1293 | static void vhost_vdpa_release_dev(struct device *device) | |
1294 | { | |
1295 | struct vhost_vdpa *v = | |
1296 | container_of(device, struct vhost_vdpa, dev); | |
1297 | ||
1298 | ida_simple_remove(&vhost_vdpa_ida, v->minor); | |
1299 | kfree(v->vqs); | |
1300 | kfree(v); | |
1301 | } | |
1302 | ||
1303 | static int vhost_vdpa_probe(struct vdpa_device *vdpa) | |
1304 | { | |
1305 | const struct vdpa_config_ops *ops = vdpa->config; | |
1306 | struct vhost_vdpa *v; | |
a9974489 | 1307 | int minor; |
3d569879 | 1308 | int i, r; |
4c8cf318 | 1309 | |
aaca8373 GD |
1310 | /* We can't support platform IOMMU device with more than 1 |
1311 | * group or as | |
1312 | */ | |
1313 | if (!ops->set_map && !ops->dma_map && | |
1314 | (vdpa->ngroups > 1 || vdpa->nas > 1)) | |
db9adcbf GD |
1315 | return -EOPNOTSUPP; |
1316 | ||
4c8cf318 TB |
1317 | v = kzalloc(sizeof(*v), GFP_KERNEL | __GFP_RETRY_MAYFAIL); |
1318 | if (!v) | |
1319 | return -ENOMEM; | |
1320 | ||
1321 | minor = ida_simple_get(&vhost_vdpa_ida, 0, | |
1322 | VHOST_VDPA_DEV_MAX, GFP_KERNEL); | |
1323 | if (minor < 0) { | |
1324 | kfree(v); | |
1325 | return minor; | |
1326 | } | |
1327 | ||
1328 | atomic_set(&v->opened, 0); | |
1329 | v->minor = minor; | |
1330 | v->vdpa = vdpa; | |
a9974489 | 1331 | v->nvqs = vdpa->nvqs; |
4c8cf318 TB |
1332 | v->virtio_id = ops->get_device_id(vdpa); |
1333 | ||
1334 | device_initialize(&v->dev); | |
1335 | v->dev.release = vhost_vdpa_release_dev; | |
1336 | v->dev.parent = &vdpa->dev; | |
1337 | v->dev.devt = MKDEV(MAJOR(vhost_vdpa_major), minor); | |
a9974489 | 1338 | v->vqs = kmalloc_array(v->nvqs, sizeof(struct vhost_virtqueue), |
4c8cf318 TB |
1339 | GFP_KERNEL); |
1340 | if (!v->vqs) { | |
1341 | r = -ENOMEM; | |
1342 | goto err; | |
1343 | } | |
1344 | ||
1345 | r = dev_set_name(&v->dev, "vhost-vdpa-%u", minor); | |
1346 | if (r) | |
1347 | goto err; | |
1348 | ||
1349 | cdev_init(&v->cdev, &vhost_vdpa_fops); | |
1350 | v->cdev.owner = THIS_MODULE; | |
1351 | ||
1352 | r = cdev_device_add(&v->cdev, &v->dev); | |
1353 | if (r) | |
1354 | goto err; | |
1355 | ||
1356 | init_completion(&v->completion); | |
1357 | vdpa_set_drvdata(vdpa, v); | |
1358 | ||
3d569879 GD |
1359 | for (i = 0; i < VHOST_VDPA_IOTLB_BUCKETS; i++) |
1360 | INIT_HLIST_HEAD(&v->as[i]); | |
1361 | ||
4c8cf318 TB |
1362 | return 0; |
1363 | ||
1364 | err: | |
1365 | put_device(&v->dev); | |
1366 | return r; | |
1367 | } | |
1368 | ||
1369 | static void vhost_vdpa_remove(struct vdpa_device *vdpa) | |
1370 | { | |
1371 | struct vhost_vdpa *v = vdpa_get_drvdata(vdpa); | |
1372 | int opened; | |
1373 | ||
1374 | cdev_device_del(&v->cdev, &v->dev); | |
1375 | ||
1376 | do { | |
1377 | opened = atomic_cmpxchg(&v->opened, 0, 1); | |
1378 | if (!opened) | |
1379 | break; | |
1380 | wait_for_completion(&v->completion); | |
1381 | } while (1); | |
1382 | ||
1383 | put_device(&v->dev); | |
1384 | } | |
1385 | ||
1386 | static struct vdpa_driver vhost_vdpa_driver = { | |
1387 | .driver = { | |
1388 | .name = "vhost_vdpa", | |
1389 | }, | |
1390 | .probe = vhost_vdpa_probe, | |
1391 | .remove = vhost_vdpa_remove, | |
1392 | }; | |
1393 | ||
1394 | static int __init vhost_vdpa_init(void) | |
1395 | { | |
1396 | int r; | |
1397 | ||
1398 | r = alloc_chrdev_region(&vhost_vdpa_major, 0, VHOST_VDPA_DEV_MAX, | |
1399 | "vhost-vdpa"); | |
1400 | if (r) | |
1401 | goto err_alloc_chrdev; | |
1402 | ||
1403 | r = vdpa_register_driver(&vhost_vdpa_driver); | |
1404 | if (r) | |
1405 | goto err_vdpa_register_driver; | |
1406 | ||
1407 | return 0; | |
1408 | ||
1409 | err_vdpa_register_driver: | |
1410 | unregister_chrdev_region(vhost_vdpa_major, VHOST_VDPA_DEV_MAX); | |
1411 | err_alloc_chrdev: | |
1412 | return r; | |
1413 | } | |
1414 | module_init(vhost_vdpa_init); | |
1415 | ||
1416 | static void __exit vhost_vdpa_exit(void) | |
1417 | { | |
1418 | vdpa_unregister_driver(&vhost_vdpa_driver); | |
1419 | unregister_chrdev_region(vhost_vdpa_major, VHOST_VDPA_DEV_MAX); | |
1420 | } | |
1421 | module_exit(vhost_vdpa_exit); | |
1422 | ||
1423 | MODULE_VERSION("0.0.1"); | |
1424 | MODULE_LICENSE("GPL v2"); | |
1425 | MODULE_AUTHOR("Intel Corporation"); | |
1426 | MODULE_DESCRIPTION("vDPA-based vhost backend for virtio"); |