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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 | ||
1d0f874b SWL |
134 | static void vhost_vdpa_reset_map(struct vhost_vdpa *v, u32 asid) |
135 | { | |
136 | struct vdpa_device *vdpa = v->vdpa; | |
137 | const struct vdpa_config_ops *ops = vdpa->config; | |
138 | ||
139 | if (ops->reset_map) | |
140 | ops->reset_map(vdpa, asid); | |
141 | } | |
142 | ||
3d569879 GD |
143 | static int vhost_vdpa_remove_as(struct vhost_vdpa *v, u32 asid) |
144 | { | |
145 | struct vhost_vdpa_as *as = asid_to_as(v, asid); | |
146 | ||
147 | if (!as) | |
148 | return -EINVAL; | |
149 | ||
150 | hlist_del(&as->hash_link); | |
e794070a | 151 | vhost_vdpa_iotlb_unmap(v, &as->iotlb, 0ULL, 0ULL - 1, asid); |
1d0f874b SWL |
152 | /* |
153 | * Devices with vendor specific IOMMU may need to restore | |
154 | * iotlb to the initial or default state, which cannot be | |
155 | * cleaned up in the all range unmap call above. Give them | |
156 | * a chance to clean up or reset the map to the desired | |
157 | * state. | |
158 | */ | |
159 | vhost_vdpa_reset_map(v, asid); | |
3d569879 GD |
160 | kfree(as); |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
4c8cf318 TB |
165 | static void handle_vq_kick(struct vhost_work *work) |
166 | { | |
167 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, | |
168 | poll.work); | |
169 | struct vhost_vdpa *v = container_of(vq->dev, struct vhost_vdpa, vdev); | |
170 | const struct vdpa_config_ops *ops = v->vdpa->config; | |
171 | ||
172 | ops->kick_vq(v->vdpa, vq - v->vqs); | |
173 | } | |
174 | ||
175 | static irqreturn_t vhost_vdpa_virtqueue_cb(void *private) | |
176 | { | |
177 | struct vhost_virtqueue *vq = private; | |
265a0ad8 | 178 | struct eventfd_ctx *call_ctx = vq->call_ctx.ctx; |
4c8cf318 TB |
179 | |
180 | if (call_ctx) | |
181 | eventfd_signal(call_ctx, 1); | |
182 | ||
183 | return IRQ_HANDLED; | |
184 | } | |
185 | ||
776f3950 ZL |
186 | static irqreturn_t vhost_vdpa_config_cb(void *private) |
187 | { | |
188 | struct vhost_vdpa *v = private; | |
189 | struct eventfd_ctx *config_ctx = v->config_ctx; | |
190 | ||
191 | if (config_ctx) | |
192 | eventfd_signal(config_ctx, 1); | |
193 | ||
194 | return IRQ_HANDLED; | |
195 | } | |
196 | ||
2cf1ba9a ZL |
197 | static void vhost_vdpa_setup_vq_irq(struct vhost_vdpa *v, u16 qid) |
198 | { | |
199 | struct vhost_virtqueue *vq = &v->vqs[qid]; | |
200 | const struct vdpa_config_ops *ops = v->vdpa->config; | |
201 | struct vdpa_device *vdpa = v->vdpa; | |
202 | int ret, irq; | |
203 | ||
204 | if (!ops->get_vq_irq) | |
205 | return; | |
206 | ||
207 | irq = ops->get_vq_irq(vdpa, qid); | |
cce0ab2b ZL |
208 | if (irq < 0) |
209 | return; | |
210 | ||
2cf1ba9a | 211 | irq_bypass_unregister_producer(&vq->call_ctx.producer); |
cce0ab2b | 212 | if (!vq->call_ctx.ctx) |
2cf1ba9a | 213 | return; |
2cf1ba9a ZL |
214 | |
215 | vq->call_ctx.producer.token = vq->call_ctx.ctx; | |
216 | vq->call_ctx.producer.irq = irq; | |
217 | ret = irq_bypass_register_producer(&vq->call_ctx.producer); | |
e01afe36 ZL |
218 | if (unlikely(ret)) |
219 | dev_info(&v->dev, "vq %u, irq bypass producer (token %p) registration fails, ret = %d\n", | |
220 | qid, vq->call_ctx.producer.token, ret); | |
2cf1ba9a ZL |
221 | } |
222 | ||
223 | static void vhost_vdpa_unsetup_vq_irq(struct vhost_vdpa *v, u16 qid) | |
224 | { | |
225 | struct vhost_virtqueue *vq = &v->vqs[qid]; | |
226 | ||
2cf1ba9a | 227 | irq_bypass_unregister_producer(&vq->call_ctx.producer); |
2cf1ba9a ZL |
228 | } |
229 | ||
bc91df5c | 230 | static int _compat_vdpa_reset(struct vhost_vdpa *v) |
4c8cf318 TB |
231 | { |
232 | struct vdpa_device *vdpa = v->vdpa; | |
bc91df5c | 233 | u32 flags = 0; |
4c8cf318 | 234 | |
bc91df5c SWL |
235 | if (v->vdev.vqs) { |
236 | flags |= !vhost_backend_has_feature(v->vdev.vqs[0], | |
237 | VHOST_BACKEND_F_IOTLB_PERSIST) ? | |
238 | VDPA_RESET_F_CLEAN_MAP : 0; | |
239 | } | |
240 | ||
241 | return vdpa_reset(vdpa, flags); | |
242 | } | |
7f05630d | 243 | |
bc91df5c SWL |
244 | static int vhost_vdpa_reset(struct vhost_vdpa *v) |
245 | { | |
246 | v->in_batch = 0; | |
247 | return _compat_vdpa_reset(v); | |
4c8cf318 TB |
248 | } |
249 | ||
9067de47 SG |
250 | static long vhost_vdpa_bind_mm(struct vhost_vdpa *v) |
251 | { | |
252 | struct vdpa_device *vdpa = v->vdpa; | |
253 | const struct vdpa_config_ops *ops = vdpa->config; | |
254 | ||
255 | if (!vdpa->use_va || !ops->bind_mm) | |
256 | return 0; | |
257 | ||
258 | return ops->bind_mm(vdpa, v->vdev.mm); | |
259 | } | |
260 | ||
261 | static void vhost_vdpa_unbind_mm(struct vhost_vdpa *v) | |
262 | { | |
263 | struct vdpa_device *vdpa = v->vdpa; | |
264 | const struct vdpa_config_ops *ops = vdpa->config; | |
265 | ||
266 | if (!vdpa->use_va || !ops->unbind_mm) | |
267 | return; | |
268 | ||
269 | ops->unbind_mm(vdpa); | |
270 | } | |
271 | ||
4c8cf318 TB |
272 | static long vhost_vdpa_get_device_id(struct vhost_vdpa *v, u8 __user *argp) |
273 | { | |
274 | struct vdpa_device *vdpa = v->vdpa; | |
275 | const struct vdpa_config_ops *ops = vdpa->config; | |
276 | u32 device_id; | |
277 | ||
278 | device_id = ops->get_device_id(vdpa); | |
279 | ||
280 | if (copy_to_user(argp, &device_id, sizeof(device_id))) | |
281 | return -EFAULT; | |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
286 | static long vhost_vdpa_get_status(struct vhost_vdpa *v, u8 __user *statusp) | |
287 | { | |
288 | struct vdpa_device *vdpa = v->vdpa; | |
f6d955d8 | 289 | const struct vdpa_config_ops *ops = vdpa->config; |
4c8cf318 TB |
290 | u8 status; |
291 | ||
f6d955d8 | 292 | status = ops->get_status(vdpa); |
4c8cf318 TB |
293 | |
294 | if (copy_to_user(statusp, &status, sizeof(status))) | |
295 | return -EFAULT; | |
296 | ||
297 | return 0; | |
298 | } | |
299 | ||
300 | static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp) | |
301 | { | |
302 | struct vdpa_device *vdpa = v->vdpa; | |
303 | const struct vdpa_config_ops *ops = vdpa->config; | |
2cf1ba9a | 304 | u8 status, status_old; |
81d46d69 L |
305 | u32 nvqs = v->nvqs; |
306 | int ret; | |
2cf1ba9a | 307 | u16 i; |
4c8cf318 TB |
308 | |
309 | if (copy_from_user(&status, statusp, sizeof(status))) | |
310 | return -EFAULT; | |
311 | ||
f6d955d8 | 312 | status_old = ops->get_status(vdpa); |
2cf1ba9a | 313 | |
4c8cf318 TB |
314 | /* |
315 | * Userspace shouldn't remove status bits unless reset the | |
316 | * status to 0. | |
317 | */ | |
23118b09 | 318 | if (status != 0 && (status_old & ~status) != 0) |
4c8cf318 TB |
319 | return -EINVAL; |
320 | ||
97f854be WZ |
321 | if ((status_old & VIRTIO_CONFIG_S_DRIVER_OK) && !(status & VIRTIO_CONFIG_S_DRIVER_OK)) |
322 | for (i = 0; i < nvqs; i++) | |
323 | vhost_vdpa_unsetup_vq_irq(v, i); | |
324 | ||
0686082d | 325 | if (status == 0) { |
bc91df5c | 326 | ret = _compat_vdpa_reset(v); |
0686082d XY |
327 | if (ret) |
328 | return ret; | |
329 | } else | |
73bc0dbb | 330 | vdpa_set_status(vdpa, status); |
4c8cf318 | 331 | |
2cf1ba9a ZL |
332 | if ((status & VIRTIO_CONFIG_S_DRIVER_OK) && !(status_old & VIRTIO_CONFIG_S_DRIVER_OK)) |
333 | for (i = 0; i < nvqs; i++) | |
334 | vhost_vdpa_setup_vq_irq(v, i); | |
335 | ||
4c8cf318 TB |
336 | return 0; |
337 | } | |
338 | ||
339 | static int vhost_vdpa_config_validate(struct vhost_vdpa *v, | |
340 | struct vhost_vdpa_config *c) | |
341 | { | |
d6d8bb92 | 342 | struct vdpa_device *vdpa = v->vdpa; |
870aaff9 | 343 | size_t size = vdpa->config->get_config_size(vdpa); |
4c8cf318 | 344 | |
3ed21c14 | 345 | if (c->len == 0 || c->off > size) |
4c8cf318 TB |
346 | return -EINVAL; |
347 | ||
348 | if (c->len > size - c->off) | |
349 | return -E2BIG; | |
350 | ||
351 | return 0; | |
352 | } | |
353 | ||
354 | static long vhost_vdpa_get_config(struct vhost_vdpa *v, | |
355 | struct vhost_vdpa_config __user *c) | |
356 | { | |
357 | struct vdpa_device *vdpa = v->vdpa; | |
4c8cf318 TB |
358 | struct vhost_vdpa_config config; |
359 | unsigned long size = offsetof(struct vhost_vdpa_config, buf); | |
360 | u8 *buf; | |
361 | ||
362 | if (copy_from_user(&config, c, size)) | |
363 | return -EFAULT; | |
364 | if (vhost_vdpa_config_validate(v, &config)) | |
365 | return -EINVAL; | |
366 | buf = kvzalloc(config.len, GFP_KERNEL); | |
367 | if (!buf) | |
368 | return -ENOMEM; | |
369 | ||
0d234007 | 370 | vdpa_get_config(vdpa, config.off, buf, config.len); |
4c8cf318 TB |
371 | |
372 | if (copy_to_user(c->buf, buf, config.len)) { | |
373 | kvfree(buf); | |
374 | return -EFAULT; | |
375 | } | |
376 | ||
377 | kvfree(buf); | |
378 | return 0; | |
379 | } | |
380 | ||
381 | static long vhost_vdpa_set_config(struct vhost_vdpa *v, | |
382 | struct vhost_vdpa_config __user *c) | |
383 | { | |
384 | struct vdpa_device *vdpa = v->vdpa; | |
4c8cf318 TB |
385 | struct vhost_vdpa_config config; |
386 | unsigned long size = offsetof(struct vhost_vdpa_config, buf); | |
387 | u8 *buf; | |
388 | ||
389 | if (copy_from_user(&config, c, size)) | |
390 | return -EFAULT; | |
391 | if (vhost_vdpa_config_validate(v, &config)) | |
392 | return -EINVAL; | |
4c8cf318 | 393 | |
0ab4b890 TT |
394 | buf = vmemdup_user(c->buf, config.len); |
395 | if (IS_ERR(buf)) | |
396 | return PTR_ERR(buf); | |
4c8cf318 | 397 | |
6dbb1f16 | 398 | vdpa_set_config(vdpa, config.off, buf, config.len); |
4c8cf318 TB |
399 | |
400 | kvfree(buf); | |
401 | return 0; | |
402 | } | |
403 | ||
0723f1df EP |
404 | static bool vhost_vdpa_can_suspend(const struct vhost_vdpa *v) |
405 | { | |
406 | struct vdpa_device *vdpa = v->vdpa; | |
407 | const struct vdpa_config_ops *ops = vdpa->config; | |
408 | ||
409 | return ops->suspend; | |
410 | } | |
411 | ||
69106b6f SB |
412 | static bool vhost_vdpa_can_resume(const struct vhost_vdpa *v) |
413 | { | |
414 | struct vdpa_device *vdpa = v->vdpa; | |
415 | const struct vdpa_config_ops *ops = vdpa->config; | |
416 | ||
417 | return ops->resume; | |
418 | } | |
419 | ||
7db0d602 SWL |
420 | static bool vhost_vdpa_has_desc_group(const struct vhost_vdpa *v) |
421 | { | |
422 | struct vdpa_device *vdpa = v->vdpa; | |
423 | const struct vdpa_config_ops *ops = vdpa->config; | |
424 | ||
425 | return ops->get_vq_desc_group; | |
426 | } | |
427 | ||
4c8cf318 TB |
428 | static long vhost_vdpa_get_features(struct vhost_vdpa *v, u64 __user *featurep) |
429 | { | |
430 | struct vdpa_device *vdpa = v->vdpa; | |
431 | const struct vdpa_config_ops *ops = vdpa->config; | |
432 | u64 features; | |
433 | ||
a64917bc | 434 | features = ops->get_device_features(vdpa); |
4c8cf318 TB |
435 | |
436 | if (copy_to_user(featurep, &features, sizeof(features))) | |
437 | return -EFAULT; | |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
b63e5c70 EP |
442 | static u64 vhost_vdpa_get_backend_features(const struct vhost_vdpa *v) |
443 | { | |
444 | struct vdpa_device *vdpa = v->vdpa; | |
445 | const struct vdpa_config_ops *ops = vdpa->config; | |
446 | ||
447 | if (!ops->get_backend_features) | |
448 | return 0; | |
449 | else | |
450 | return ops->get_backend_features(vdpa); | |
451 | } | |
452 | ||
4398776f SWL |
453 | static bool vhost_vdpa_has_persistent_map(const struct vhost_vdpa *v) |
454 | { | |
455 | struct vdpa_device *vdpa = v->vdpa; | |
456 | const struct vdpa_config_ops *ops = vdpa->config; | |
457 | ||
458 | return (!ops->set_map && !ops->dma_map) || ops->reset_map || | |
459 | vhost_vdpa_get_backend_features(v) & BIT_ULL(VHOST_BACKEND_F_IOTLB_PERSIST); | |
460 | } | |
461 | ||
4c8cf318 TB |
462 | static long vhost_vdpa_set_features(struct vhost_vdpa *v, u64 __user *featurep) |
463 | { | |
464 | struct vdpa_device *vdpa = v->vdpa; | |
465 | const struct vdpa_config_ops *ops = vdpa->config; | |
376daf31 SN |
466 | struct vhost_dev *d = &v->vdev; |
467 | u64 actual_features; | |
4c8cf318 | 468 | u64 features; |
376daf31 | 469 | int i; |
4c8cf318 TB |
470 | |
471 | /* | |
472 | * It's not allowed to change the features after they have | |
473 | * been negotiated. | |
474 | */ | |
475 | if (ops->get_status(vdpa) & VIRTIO_CONFIG_S_FEATURES_OK) | |
476 | return -EBUSY; | |
477 | ||
478 | if (copy_from_user(&features, featurep, sizeof(features))) | |
479 | return -EFAULT; | |
480 | ||
e0077cc1 | 481 | if (vdpa_set_features(vdpa, features)) |
4c8cf318 TB |
482 | return -EINVAL; |
483 | ||
376daf31 SN |
484 | /* let the vqs know what has been configured */ |
485 | actual_features = ops->get_driver_features(vdpa); | |
486 | for (i = 0; i < d->nvqs; ++i) { | |
487 | struct vhost_virtqueue *vq = d->vqs[i]; | |
488 | ||
489 | mutex_lock(&vq->mutex); | |
490 | vq->acked_features = actual_features; | |
491 | mutex_unlock(&vq->mutex); | |
492 | } | |
493 | ||
4c8cf318 TB |
494 | return 0; |
495 | } | |
496 | ||
497 | static long vhost_vdpa_get_vring_num(struct vhost_vdpa *v, u16 __user *argp) | |
498 | { | |
499 | struct vdpa_device *vdpa = v->vdpa; | |
500 | const struct vdpa_config_ops *ops = vdpa->config; | |
501 | u16 num; | |
502 | ||
503 | num = ops->get_vq_num_max(vdpa); | |
504 | ||
505 | if (copy_to_user(argp, &num, sizeof(num))) | |
506 | return -EFAULT; | |
507 | ||
508 | return 0; | |
509 | } | |
510 | ||
776f3950 ZL |
511 | static void vhost_vdpa_config_put(struct vhost_vdpa *v) |
512 | { | |
f6bbf001 | 513 | if (v->config_ctx) { |
776f3950 | 514 | eventfd_ctx_put(v->config_ctx); |
f6bbf001 SG |
515 | v->config_ctx = NULL; |
516 | } | |
776f3950 ZL |
517 | } |
518 | ||
519 | static long vhost_vdpa_set_config_call(struct vhost_vdpa *v, u32 __user *argp) | |
520 | { | |
521 | struct vdpa_callback cb; | |
522 | int fd; | |
523 | struct eventfd_ctx *ctx; | |
524 | ||
525 | cb.callback = vhost_vdpa_config_cb; | |
bcef9356 | 526 | cb.private = v; |
776f3950 ZL |
527 | if (copy_from_user(&fd, argp, sizeof(fd))) |
528 | return -EFAULT; | |
529 | ||
530 | ctx = fd == VHOST_FILE_UNBIND ? NULL : eventfd_ctx_fdget(fd); | |
531 | swap(ctx, v->config_ctx); | |
532 | ||
533 | if (!IS_ERR_OR_NULL(ctx)) | |
534 | eventfd_ctx_put(ctx); | |
535 | ||
0bde59c1 SG |
536 | if (IS_ERR(v->config_ctx)) { |
537 | long ret = PTR_ERR(v->config_ctx); | |
538 | ||
539 | v->config_ctx = NULL; | |
540 | return ret; | |
541 | } | |
776f3950 ZL |
542 | |
543 | v->vdpa->config->set_config_cb(v->vdpa, &cb); | |
544 | ||
545 | return 0; | |
546 | } | |
2cf1ba9a | 547 | |
1b48dc03 JW |
548 | static long vhost_vdpa_get_iova_range(struct vhost_vdpa *v, u32 __user *argp) |
549 | { | |
550 | struct vhost_vdpa_iova_range range = { | |
551 | .first = v->range.first, | |
552 | .last = v->range.last, | |
553 | }; | |
554 | ||
2c602741 DC |
555 | if (copy_to_user(argp, &range, sizeof(range))) |
556 | return -EFAULT; | |
557 | return 0; | |
1b48dc03 JW |
558 | } |
559 | ||
a61280dd L |
560 | static long vhost_vdpa_get_config_size(struct vhost_vdpa *v, u32 __user *argp) |
561 | { | |
562 | struct vdpa_device *vdpa = v->vdpa; | |
563 | const struct vdpa_config_ops *ops = vdpa->config; | |
564 | u32 size; | |
565 | ||
566 | size = ops->get_config_size(vdpa); | |
567 | ||
568 | if (copy_to_user(argp, &size, sizeof(size))) | |
569 | return -EFAULT; | |
570 | ||
571 | return 0; | |
572 | } | |
573 | ||
b04d910a L |
574 | static long vhost_vdpa_get_vqs_count(struct vhost_vdpa *v, u32 __user *argp) |
575 | { | |
576 | struct vdpa_device *vdpa = v->vdpa; | |
577 | ||
578 | if (copy_to_user(argp, &vdpa->nvqs, sizeof(vdpa->nvqs))) | |
579 | return -EFAULT; | |
580 | ||
581 | return 0; | |
582 | } | |
583 | ||
f345a014 EP |
584 | /* After a successful return of ioctl the device must not process more |
585 | * virtqueue descriptors. The device can answer to read or writes of config | |
586 | * fields as if it were not suspended. In particular, writing to "queue_enable" | |
587 | * with a value of 1 will not make the device start processing buffers. | |
588 | */ | |
589 | static long vhost_vdpa_suspend(struct vhost_vdpa *v) | |
590 | { | |
591 | struct vdpa_device *vdpa = v->vdpa; | |
592 | const struct vdpa_config_ops *ops = vdpa->config; | |
593 | ||
594 | if (!ops->suspend) | |
595 | return -EOPNOTSUPP; | |
596 | ||
597 | return ops->suspend(vdpa); | |
598 | } | |
599 | ||
3b688d7a SB |
600 | /* After a successful return of this ioctl the device resumes processing |
601 | * virtqueue descriptors. The device becomes fully operational the same way it | |
602 | * was before it was suspended. | |
603 | */ | |
604 | static long vhost_vdpa_resume(struct vhost_vdpa *v) | |
605 | { | |
606 | struct vdpa_device *vdpa = v->vdpa; | |
607 | const struct vdpa_config_ops *ops = vdpa->config; | |
608 | ||
609 | if (!ops->resume) | |
610 | return -EOPNOTSUPP; | |
611 | ||
612 | return ops->resume(vdpa); | |
613 | } | |
614 | ||
4c8cf318 TB |
615 | static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd, |
616 | void __user *argp) | |
617 | { | |
618 | struct vdpa_device *vdpa = v->vdpa; | |
619 | const struct vdpa_config_ops *ops = vdpa->config; | |
aac50c0b | 620 | struct vdpa_vq_state vq_state; |
4c8cf318 TB |
621 | struct vdpa_callback cb; |
622 | struct vhost_virtqueue *vq; | |
623 | struct vhost_vring_state s; | |
4c8cf318 TB |
624 | u32 idx; |
625 | long r; | |
626 | ||
627 | r = get_user(idx, (u32 __user *)argp); | |
628 | if (r < 0) | |
629 | return r; | |
630 | ||
631 | if (idx >= v->nvqs) | |
632 | return -ENOBUFS; | |
633 | ||
634 | idx = array_index_nospec(idx, v->nvqs); | |
635 | vq = &v->vqs[idx]; | |
636 | ||
b0bd82bf JW |
637 | switch (cmd) { |
638 | case VHOST_VDPA_SET_VRING_ENABLE: | |
4c8cf318 TB |
639 | if (copy_from_user(&s, argp, sizeof(s))) |
640 | return -EFAULT; | |
641 | ops->set_vq_ready(vdpa, idx, s.num); | |
642 | return 0; | |
2d1fcb77 | 643 | case VHOST_VDPA_GET_VRING_GROUP: |
00d1f546 JW |
644 | if (!ops->get_vq_group) |
645 | return -EOPNOTSUPP; | |
2d1fcb77 GD |
646 | s.index = idx; |
647 | s.num = ops->get_vq_group(vdpa, idx); | |
648 | if (s.num >= vdpa->ngroups) | |
649 | return -EIO; | |
650 | else if (copy_to_user(argp, &s, sizeof(s))) | |
c8068d9b SWL |
651 | return -EFAULT; |
652 | return 0; | |
653 | case VHOST_VDPA_GET_VRING_DESC_GROUP: | |
654 | if (!vhost_vdpa_has_desc_group(v)) | |
655 | return -EOPNOTSUPP; | |
656 | s.index = idx; | |
657 | s.num = ops->get_vq_desc_group(vdpa, idx); | |
658 | if (s.num >= vdpa->ngroups) | |
659 | return -EIO; | |
660 | else if (copy_to_user(argp, &s, sizeof(s))) | |
2d1fcb77 GD |
661 | return -EFAULT; |
662 | return 0; | |
84d7c8fd GD |
663 | case VHOST_VDPA_SET_GROUP_ASID: |
664 | if (copy_from_user(&s, argp, sizeof(s))) | |
665 | return -EFAULT; | |
666 | if (s.num >= vdpa->nas) | |
667 | return -EINVAL; | |
668 | if (!ops->set_group_asid) | |
669 | return -EOPNOTSUPP; | |
670 | return ops->set_group_asid(vdpa, idx, s.num); | |
b0bd82bf | 671 | case VHOST_GET_VRING_BASE: |
23750e39 EC |
672 | r = ops->get_vq_state(v->vdpa, idx, &vq_state); |
673 | if (r) | |
674 | return r; | |
675 | ||
beee7fdb SN |
676 | if (vhost_has_feature(vq, VIRTIO_F_RING_PACKED)) { |
677 | vq->last_avail_idx = vq_state.packed.last_avail_idx | | |
678 | (vq_state.packed.last_avail_counter << 15); | |
679 | vq->last_used_idx = vq_state.packed.last_used_idx | | |
680 | (vq_state.packed.last_used_counter << 15); | |
681 | } else { | |
682 | vq->last_avail_idx = vq_state.split.avail_index; | |
683 | } | |
b0bd82bf JW |
684 | break; |
685 | } | |
4c8cf318 TB |
686 | |
687 | r = vhost_vring_ioctl(&v->vdev, cmd, argp); | |
688 | if (r) | |
689 | return r; | |
690 | ||
691 | switch (cmd) { | |
692 | case VHOST_SET_VRING_ADDR: | |
693 | if (ops->set_vq_address(vdpa, idx, | |
694 | (u64)(uintptr_t)vq->desc, | |
695 | (u64)(uintptr_t)vq->avail, | |
696 | (u64)(uintptr_t)vq->used)) | |
697 | r = -EINVAL; | |
698 | break; | |
699 | ||
700 | case VHOST_SET_VRING_BASE: | |
beee7fdb SN |
701 | if (vhost_has_feature(vq, VIRTIO_F_RING_PACKED)) { |
702 | vq_state.packed.last_avail_idx = vq->last_avail_idx & 0x7fff; | |
703 | vq_state.packed.last_avail_counter = !!(vq->last_avail_idx & 0x8000); | |
704 | vq_state.packed.last_used_idx = vq->last_used_idx & 0x7fff; | |
705 | vq_state.packed.last_used_counter = !!(vq->last_used_idx & 0x8000); | |
706 | } else { | |
707 | vq_state.split.avail_index = vq->last_avail_idx; | |
708 | } | |
709 | r = ops->set_vq_state(vdpa, idx, &vq_state); | |
4c8cf318 TB |
710 | break; |
711 | ||
712 | case VHOST_SET_VRING_CALL: | |
265a0ad8 | 713 | if (vq->call_ctx.ctx) { |
4c8cf318 TB |
714 | cb.callback = vhost_vdpa_virtqueue_cb; |
715 | cb.private = vq; | |
5e68470f | 716 | cb.trigger = vq->call_ctx.ctx; |
4c8cf318 TB |
717 | } else { |
718 | cb.callback = NULL; | |
719 | cb.private = NULL; | |
5e68470f | 720 | cb.trigger = NULL; |
4c8cf318 TB |
721 | } |
722 | ops->set_vq_cb(vdpa, idx, &cb); | |
2cf1ba9a | 723 | vhost_vdpa_setup_vq_irq(v, idx); |
4c8cf318 TB |
724 | break; |
725 | ||
726 | case VHOST_SET_VRING_NUM: | |
727 | ops->set_vq_num(vdpa, idx, vq->num); | |
728 | break; | |
729 | } | |
730 | ||
731 | return r; | |
732 | } | |
733 | ||
734 | static long vhost_vdpa_unlocked_ioctl(struct file *filep, | |
735 | unsigned int cmd, unsigned long arg) | |
736 | { | |
737 | struct vhost_vdpa *v = filep->private_data; | |
738 | struct vhost_dev *d = &v->vdev; | |
739 | void __user *argp = (void __user *)arg; | |
a127c5bb JW |
740 | u64 __user *featurep = argp; |
741 | u64 features; | |
7922460e | 742 | long r = 0; |
4c8cf318 | 743 | |
a127c5bb | 744 | if (cmd == VHOST_SET_BACKEND_FEATURES) { |
7922460e DC |
745 | if (copy_from_user(&features, featurep, sizeof(features))) |
746 | return -EFAULT; | |
0723f1df | 747 | if (features & ~(VHOST_VDPA_BACKEND_FEATURES | |
7db0d602 | 748 | BIT_ULL(VHOST_BACKEND_F_DESC_ASID) | |
4398776f | 749 | BIT_ULL(VHOST_BACKEND_F_IOTLB_PERSIST) | |
69106b6f | 750 | BIT_ULL(VHOST_BACKEND_F_SUSPEND) | |
9f09fd61 EP |
751 | BIT_ULL(VHOST_BACKEND_F_RESUME) | |
752 | BIT_ULL(VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK))) | |
0723f1df EP |
753 | return -EOPNOTSUPP; |
754 | if ((features & BIT_ULL(VHOST_BACKEND_F_SUSPEND)) && | |
755 | !vhost_vdpa_can_suspend(v)) | |
a127c5bb | 756 | return -EOPNOTSUPP; |
69106b6f SB |
757 | if ((features & BIT_ULL(VHOST_BACKEND_F_RESUME)) && |
758 | !vhost_vdpa_can_resume(v)) | |
759 | return -EOPNOTSUPP; | |
7db0d602 SWL |
760 | if ((features & BIT_ULL(VHOST_BACKEND_F_DESC_ASID)) && |
761 | !(features & BIT_ULL(VHOST_BACKEND_F_IOTLB_ASID))) | |
762 | return -EINVAL; | |
763 | if ((features & BIT_ULL(VHOST_BACKEND_F_DESC_ASID)) && | |
764 | !vhost_vdpa_has_desc_group(v)) | |
765 | return -EOPNOTSUPP; | |
4398776f SWL |
766 | if ((features & BIT_ULL(VHOST_BACKEND_F_IOTLB_PERSIST)) && |
767 | !vhost_vdpa_has_persistent_map(v)) | |
768 | return -EOPNOTSUPP; | |
a127c5bb JW |
769 | vhost_set_backend_features(&v->vdev, features); |
770 | return 0; | |
771 | } | |
772 | ||
4c8cf318 TB |
773 | mutex_lock(&d->mutex); |
774 | ||
775 | switch (cmd) { | |
776 | case VHOST_VDPA_GET_DEVICE_ID: | |
777 | r = vhost_vdpa_get_device_id(v, argp); | |
778 | break; | |
779 | case VHOST_VDPA_GET_STATUS: | |
780 | r = vhost_vdpa_get_status(v, argp); | |
781 | break; | |
782 | case VHOST_VDPA_SET_STATUS: | |
783 | r = vhost_vdpa_set_status(v, argp); | |
784 | break; | |
785 | case VHOST_VDPA_GET_CONFIG: | |
786 | r = vhost_vdpa_get_config(v, argp); | |
787 | break; | |
788 | case VHOST_VDPA_SET_CONFIG: | |
789 | r = vhost_vdpa_set_config(v, argp); | |
790 | break; | |
791 | case VHOST_GET_FEATURES: | |
792 | r = vhost_vdpa_get_features(v, argp); | |
793 | break; | |
794 | case VHOST_SET_FEATURES: | |
795 | r = vhost_vdpa_set_features(v, argp); | |
796 | break; | |
797 | case VHOST_VDPA_GET_VRING_NUM: | |
798 | r = vhost_vdpa_get_vring_num(v, argp); | |
799 | break; | |
3ace88bd | 800 | case VHOST_VDPA_GET_GROUP_NUM: |
f4a8686e DC |
801 | if (copy_to_user(argp, &v->vdpa->ngroups, |
802 | sizeof(v->vdpa->ngroups))) | |
803 | r = -EFAULT; | |
3ace88bd | 804 | break; |
a0c95f20 | 805 | case VHOST_VDPA_GET_AS_NUM: |
f4a8686e DC |
806 | if (copy_to_user(argp, &v->vdpa->nas, sizeof(v->vdpa->nas))) |
807 | r = -EFAULT; | |
a0c95f20 | 808 | break; |
4c8cf318 TB |
809 | case VHOST_SET_LOG_BASE: |
810 | case VHOST_SET_LOG_FD: | |
811 | r = -ENOIOCTLCMD; | |
812 | break; | |
776f3950 ZL |
813 | case VHOST_VDPA_SET_CONFIG_CALL: |
814 | r = vhost_vdpa_set_config_call(v, argp); | |
815 | break; | |
a127c5bb JW |
816 | case VHOST_GET_BACKEND_FEATURES: |
817 | features = VHOST_VDPA_BACKEND_FEATURES; | |
0723f1df EP |
818 | if (vhost_vdpa_can_suspend(v)) |
819 | features |= BIT_ULL(VHOST_BACKEND_F_SUSPEND); | |
69106b6f SB |
820 | if (vhost_vdpa_can_resume(v)) |
821 | features |= BIT_ULL(VHOST_BACKEND_F_RESUME); | |
7db0d602 SWL |
822 | if (vhost_vdpa_has_desc_group(v)) |
823 | features |= BIT_ULL(VHOST_BACKEND_F_DESC_ASID); | |
4398776f SWL |
824 | if (vhost_vdpa_has_persistent_map(v)) |
825 | features |= BIT_ULL(VHOST_BACKEND_F_IOTLB_PERSIST); | |
b63e5c70 | 826 | features |= vhost_vdpa_get_backend_features(v); |
7922460e DC |
827 | if (copy_to_user(featurep, &features, sizeof(features))) |
828 | r = -EFAULT; | |
a127c5bb | 829 | break; |
1b48dc03 JW |
830 | case VHOST_VDPA_GET_IOVA_RANGE: |
831 | r = vhost_vdpa_get_iova_range(v, argp); | |
832 | break; | |
a61280dd L |
833 | case VHOST_VDPA_GET_CONFIG_SIZE: |
834 | r = vhost_vdpa_get_config_size(v, argp); | |
835 | break; | |
b04d910a L |
836 | case VHOST_VDPA_GET_VQS_COUNT: |
837 | r = vhost_vdpa_get_vqs_count(v, argp); | |
838 | break; | |
f345a014 EP |
839 | case VHOST_VDPA_SUSPEND: |
840 | r = vhost_vdpa_suspend(v); | |
841 | break; | |
3b688d7a SB |
842 | case VHOST_VDPA_RESUME: |
843 | r = vhost_vdpa_resume(v); | |
844 | break; | |
4c8cf318 TB |
845 | default: |
846 | r = vhost_dev_ioctl(&v->vdev, cmd, argp); | |
847 | if (r == -ENOIOCTLCMD) | |
848 | r = vhost_vdpa_vring_ioctl(v, cmd, argp); | |
849 | break; | |
850 | } | |
851 | ||
9067de47 SG |
852 | if (r) |
853 | goto out; | |
854 | ||
855 | switch (cmd) { | |
856 | case VHOST_SET_OWNER: | |
857 | r = vhost_vdpa_bind_mm(v); | |
858 | if (r) | |
859 | vhost_dev_reset_owner(d, NULL); | |
860 | break; | |
861 | } | |
862 | out: | |
4c8cf318 TB |
863 | mutex_unlock(&d->mutex); |
864 | return r; | |
865 | } | |
e794070a CL |
866 | static void vhost_vdpa_general_unmap(struct vhost_vdpa *v, |
867 | struct vhost_iotlb_map *map, u32 asid) | |
868 | { | |
869 | struct vdpa_device *vdpa = v->vdpa; | |
870 | const struct vdpa_config_ops *ops = vdpa->config; | |
871 | if (ops->dma_map) { | |
872 | ops->dma_unmap(vdpa, asid, map->start, map->size); | |
873 | } else if (ops->set_map == NULL) { | |
874 | iommu_unmap(v->domain, map->start, map->size); | |
875 | } | |
876 | } | |
4c8cf318 | 877 | |
e794070a CL |
878 | static void vhost_vdpa_pa_unmap(struct vhost_vdpa *v, struct vhost_iotlb *iotlb, |
879 | u64 start, u64 last, u32 asid) | |
4c8cf318 TB |
880 | { |
881 | struct vhost_dev *dev = &v->vdev; | |
4c8cf318 TB |
882 | struct vhost_iotlb_map *map; |
883 | struct page *page; | |
884 | unsigned long pfn, pinned; | |
885 | ||
886 | while ((map = vhost_iotlb_itree_first(iotlb, start, last)) != NULL) { | |
729ce5a5 CH |
887 | pinned = PFN_DOWN(map->size); |
888 | for (pfn = PFN_DOWN(map->addr); | |
4c8cf318 TB |
889 | pinned > 0; pfn++, pinned--) { |
890 | page = pfn_to_page(pfn); | |
891 | if (map->perm & VHOST_ACCESS_WO) | |
892 | set_page_dirty_lock(page); | |
893 | unpin_user_page(page); | |
894 | } | |
729ce5a5 | 895 | atomic64_sub(PFN_DOWN(map->size), &dev->mm->pinned_vm); |
e794070a | 896 | vhost_vdpa_general_unmap(v, map, asid); |
4c8cf318 TB |
897 | vhost_iotlb_map_free(iotlb, map); |
898 | } | |
899 | } | |
900 | ||
e794070a CL |
901 | static void vhost_vdpa_va_unmap(struct vhost_vdpa *v, struct vhost_iotlb *iotlb, |
902 | u64 start, u64 last, u32 asid) | |
d8945ec4 | 903 | { |
d8945ec4 XY |
904 | struct vhost_iotlb_map *map; |
905 | struct vdpa_map_file *map_file; | |
906 | ||
907 | while ((map = vhost_iotlb_itree_first(iotlb, start, last)) != NULL) { | |
908 | map_file = (struct vdpa_map_file *)map->opaque; | |
909 | fput(map_file->file); | |
910 | kfree(map_file); | |
e794070a | 911 | vhost_vdpa_general_unmap(v, map, asid); |
d8945ec4 XY |
912 | vhost_iotlb_map_free(iotlb, map); |
913 | } | |
914 | } | |
915 | ||
ae967246 | 916 | static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v, |
e794070a CL |
917 | struct vhost_iotlb *iotlb, u64 start, |
918 | u64 last, u32 asid) | |
22af48cf | 919 | { |
d8945ec4 XY |
920 | struct vdpa_device *vdpa = v->vdpa; |
921 | ||
922 | if (vdpa->use_va) | |
e794070a | 923 | return vhost_vdpa_va_unmap(v, iotlb, start, last, asid); |
d8945ec4 | 924 | |
e794070a | 925 | return vhost_vdpa_pa_unmap(v, iotlb, start, last, asid); |
22af48cf XY |
926 | } |
927 | ||
4c8cf318 TB |
928 | static int perm_to_iommu_flags(u32 perm) |
929 | { | |
930 | int flags = 0; | |
931 | ||
932 | switch (perm) { | |
933 | case VHOST_ACCESS_WO: | |
934 | flags |= IOMMU_WRITE; | |
935 | break; | |
936 | case VHOST_ACCESS_RO: | |
937 | flags |= IOMMU_READ; | |
938 | break; | |
939 | case VHOST_ACCESS_RW: | |
940 | flags |= (IOMMU_WRITE | IOMMU_READ); | |
941 | break; | |
942 | default: | |
943 | WARN(1, "invalidate vhost IOTLB permission\n"); | |
944 | break; | |
945 | } | |
946 | ||
947 | return flags | IOMMU_CACHE; | |
948 | } | |
949 | ||
ae967246 GD |
950 | static int vhost_vdpa_map(struct vhost_vdpa *v, struct vhost_iotlb *iotlb, |
951 | u64 iova, u64 size, u64 pa, u32 perm, void *opaque) | |
4c8cf318 TB |
952 | { |
953 | struct vhost_dev *dev = &v->vdev; | |
954 | struct vdpa_device *vdpa = v->vdpa; | |
955 | const struct vdpa_config_ops *ops = vdpa->config; | |
aaca8373 | 956 | u32 asid = iotlb_to_asid(iotlb); |
4c8cf318 TB |
957 | int r = 0; |
958 | ||
ae967246 | 959 | r = vhost_iotlb_add_range_ctx(iotlb, iova, iova + size - 1, |
d8945ec4 | 960 | pa, perm, opaque); |
4c8cf318 TB |
961 | if (r) |
962 | return r; | |
963 | ||
25abc060 | 964 | if (ops->dma_map) { |
aaca8373 | 965 | r = ops->dma_map(vdpa, asid, iova, size, pa, perm, opaque); |
25abc060 JW |
966 | } else if (ops->set_map) { |
967 | if (!v->in_batch) | |
aaca8373 | 968 | r = ops->set_map(vdpa, asid, iotlb); |
25abc060 | 969 | } else { |
4c8cf318 | 970 | r = iommu_map(v->domain, iova, pa, size, |
1369459b | 971 | perm_to_iommu_flags(perm), GFP_KERNEL); |
25abc060 | 972 | } |
d8945ec4 | 973 | if (r) { |
ae967246 | 974 | vhost_iotlb_del_range(iotlb, iova, iova + size - 1); |
d8945ec4 XY |
975 | return r; |
976 | } | |
977 | ||
978 | if (!vdpa->use_va) | |
729ce5a5 | 979 | atomic64_add(PFN_DOWN(size), &dev->mm->pinned_vm); |
1477c8ae | 980 | |
d8945ec4 | 981 | return 0; |
4c8cf318 TB |
982 | } |
983 | ||
ae967246 GD |
984 | static void vhost_vdpa_unmap(struct vhost_vdpa *v, |
985 | struct vhost_iotlb *iotlb, | |
986 | u64 iova, u64 size) | |
4c8cf318 | 987 | { |
4c8cf318 TB |
988 | struct vdpa_device *vdpa = v->vdpa; |
989 | const struct vdpa_config_ops *ops = vdpa->config; | |
aaca8373 | 990 | u32 asid = iotlb_to_asid(iotlb); |
4c8cf318 | 991 | |
e794070a | 992 | vhost_vdpa_iotlb_unmap(v, iotlb, iova, iova + size - 1, asid); |
4c8cf318 | 993 | |
e794070a | 994 | if (ops->set_map) { |
25abc060 | 995 | if (!v->in_batch) |
aaca8373 | 996 | ops->set_map(vdpa, asid, iotlb); |
25abc060 | 997 | } |
c82729e0 | 998 | |
4c8cf318 TB |
999 | } |
1000 | ||
d8945ec4 | 1001 | static int vhost_vdpa_va_map(struct vhost_vdpa *v, |
ae967246 | 1002 | struct vhost_iotlb *iotlb, |
d8945ec4 XY |
1003 | u64 iova, u64 size, u64 uaddr, u32 perm) |
1004 | { | |
1005 | struct vhost_dev *dev = &v->vdev; | |
1006 | u64 offset, map_size, map_iova = iova; | |
1007 | struct vdpa_map_file *map_file; | |
1008 | struct vm_area_struct *vma; | |
be9c6bad | 1009 | int ret = 0; |
d8945ec4 XY |
1010 | |
1011 | mmap_read_lock(dev->mm); | |
1012 | ||
1013 | while (size) { | |
1014 | vma = find_vma(dev->mm, uaddr); | |
1015 | if (!vma) { | |
1016 | ret = -EINVAL; | |
1017 | break; | |
1018 | } | |
1019 | map_size = min(size, vma->vm_end - uaddr); | |
1020 | if (!(vma->vm_file && (vma->vm_flags & VM_SHARED) && | |
1021 | !(vma->vm_flags & (VM_IO | VM_PFNMAP)))) | |
1022 | goto next; | |
1023 | ||
1024 | map_file = kzalloc(sizeof(*map_file), GFP_KERNEL); | |
1025 | if (!map_file) { | |
1026 | ret = -ENOMEM; | |
1027 | break; | |
1028 | } | |
1029 | offset = (vma->vm_pgoff << PAGE_SHIFT) + uaddr - vma->vm_start; | |
1030 | map_file->offset = offset; | |
1031 | map_file->file = get_file(vma->vm_file); | |
ae967246 | 1032 | ret = vhost_vdpa_map(v, iotlb, map_iova, map_size, uaddr, |
d8945ec4 XY |
1033 | perm, map_file); |
1034 | if (ret) { | |
1035 | fput(map_file->file); | |
1036 | kfree(map_file); | |
1037 | break; | |
1038 | } | |
1039 | next: | |
1040 | size -= map_size; | |
1041 | uaddr += map_size; | |
1042 | map_iova += map_size; | |
1043 | } | |
1044 | if (ret) | |
ae967246 | 1045 | vhost_vdpa_unmap(v, iotlb, iova, map_iova - iova); |
d8945ec4 XY |
1046 | |
1047 | mmap_read_unlock(dev->mm); | |
1048 | ||
1049 | return ret; | |
1050 | } | |
1051 | ||
22af48cf | 1052 | static int vhost_vdpa_pa_map(struct vhost_vdpa *v, |
ae967246 | 1053 | struct vhost_iotlb *iotlb, |
22af48cf | 1054 | u64 iova, u64 size, u64 uaddr, u32 perm) |
4c8cf318 TB |
1055 | { |
1056 | struct vhost_dev *dev = &v->vdev; | |
4c8cf318 | 1057 | struct page **page_list; |
5e1a3149 | 1058 | unsigned long list_size = PAGE_SIZE / sizeof(struct page *); |
4c8cf318 | 1059 | unsigned int gup_flags = FOLL_LONGTERM; |
5e1a3149 | 1060 | unsigned long npages, cur_base, map_pfn, last_pfn = 0; |
ad89653f | 1061 | unsigned long lock_limit, sz2pin, nchunks, i; |
22af48cf | 1062 | u64 start = iova; |
ad89653f | 1063 | long pinned; |
4c8cf318 TB |
1064 | int ret = 0; |
1065 | ||
ad89653f | 1066 | /* Limit the use of memory for bookkeeping */ |
5e1a3149 MT |
1067 | page_list = (struct page **) __get_free_page(GFP_KERNEL); |
1068 | if (!page_list) | |
1069 | return -ENOMEM; | |
1070 | ||
22af48cf | 1071 | if (perm & VHOST_ACCESS_WO) |
4c8cf318 TB |
1072 | gup_flags |= FOLL_WRITE; |
1073 | ||
22af48cf | 1074 | npages = PFN_UP(size + (iova & ~PAGE_MASK)); |
ad89653f SWL |
1075 | if (!npages) { |
1076 | ret = -EINVAL; | |
1077 | goto free; | |
1078 | } | |
4c8cf318 | 1079 | |
d8ed45c5 | 1080 | mmap_read_lock(dev->mm); |
4c8cf318 | 1081 | |
729ce5a5 | 1082 | lock_limit = PFN_DOWN(rlimit(RLIMIT_MEMLOCK)); |
ad89653f | 1083 | if (npages + atomic64_read(&dev->mm->pinned_vm) > lock_limit) { |
5e1a3149 | 1084 | ret = -ENOMEM; |
ad89653f | 1085 | goto unlock; |
7ed9e3d9 | 1086 | } |
4c8cf318 | 1087 | |
22af48cf | 1088 | cur_base = uaddr & PAGE_MASK; |
7ed9e3d9 | 1089 | iova &= PAGE_MASK; |
ad89653f | 1090 | nchunks = 0; |
5e1a3149 MT |
1091 | |
1092 | while (npages) { | |
ad89653f SWL |
1093 | sz2pin = min_t(unsigned long, npages, list_size); |
1094 | pinned = pin_user_pages(cur_base, sz2pin, | |
4c630f30 | 1095 | gup_flags, page_list); |
ad89653f SWL |
1096 | if (sz2pin != pinned) { |
1097 | if (pinned < 0) { | |
1098 | ret = pinned; | |
1099 | } else { | |
1100 | unpin_user_pages(page_list, pinned); | |
1101 | ret = -ENOMEM; | |
1102 | } | |
5e1a3149 | 1103 | goto out; |
ad89653f SWL |
1104 | } |
1105 | nchunks++; | |
5e1a3149 MT |
1106 | |
1107 | if (!last_pfn) | |
1108 | map_pfn = page_to_pfn(page_list[0]); | |
1109 | ||
ad89653f | 1110 | for (i = 0; i < pinned; i++) { |
5e1a3149 MT |
1111 | unsigned long this_pfn = page_to_pfn(page_list[i]); |
1112 | u64 csize; | |
1113 | ||
1114 | if (last_pfn && (this_pfn != last_pfn + 1)) { | |
1115 | /* Pin a contiguous chunk of memory */ | |
729ce5a5 | 1116 | csize = PFN_PHYS(last_pfn - map_pfn + 1); |
ae967246 | 1117 | ret = vhost_vdpa_map(v, iotlb, iova, csize, |
729ce5a5 | 1118 | PFN_PHYS(map_pfn), |
d8945ec4 | 1119 | perm, NULL); |
ad89653f SWL |
1120 | if (ret) { |
1121 | /* | |
1122 | * Unpin the pages that are left unmapped | |
1123 | * from this point on in the current | |
1124 | * page_list. The remaining outstanding | |
1125 | * ones which may stride across several | |
1126 | * chunks will be covered in the common | |
1127 | * error path subsequently. | |
1128 | */ | |
1129 | unpin_user_pages(&page_list[i], | |
1130 | pinned - i); | |
5e1a3149 | 1131 | goto out; |
ad89653f SWL |
1132 | } |
1133 | ||
5e1a3149 MT |
1134 | map_pfn = this_pfn; |
1135 | iova += csize; | |
ad89653f | 1136 | nchunks = 0; |
4c8cf318 | 1137 | } |
5e1a3149 MT |
1138 | |
1139 | last_pfn = this_pfn; | |
4c8cf318 | 1140 | } |
5e1a3149 | 1141 | |
729ce5a5 | 1142 | cur_base += PFN_PHYS(pinned); |
ad89653f | 1143 | npages -= pinned; |
4c8cf318 TB |
1144 | } |
1145 | ||
5e1a3149 | 1146 | /* Pin the rest chunk */ |
ae967246 | 1147 | ret = vhost_vdpa_map(v, iotlb, iova, PFN_PHYS(last_pfn - map_pfn + 1), |
d8945ec4 | 1148 | PFN_PHYS(map_pfn), perm, NULL); |
4c8cf318 | 1149 | out: |
5e1a3149 | 1150 | if (ret) { |
ad89653f SWL |
1151 | if (nchunks) { |
1152 | unsigned long pfn; | |
1153 | ||
1154 | /* | |
1155 | * Unpin the outstanding pages which are yet to be | |
1156 | * mapped but haven't due to vdpa_map() or | |
1157 | * pin_user_pages() failure. | |
1158 | * | |
1159 | * Mapped pages are accounted in vdpa_map(), hence | |
1160 | * the corresponding unpinning will be handled by | |
1161 | * vdpa_unmap(). | |
1162 | */ | |
1163 | WARN_ON(!last_pfn); | |
1164 | for (pfn = map_pfn; pfn <= last_pfn; pfn++) | |
1165 | unpin_user_page(pfn_to_page(pfn)); | |
1166 | } | |
ae967246 | 1167 | vhost_vdpa_unmap(v, iotlb, start, size); |
5e1a3149 | 1168 | } |
ad89653f | 1169 | unlock: |
d8ed45c5 | 1170 | mmap_read_unlock(dev->mm); |
ad89653f | 1171 | free: |
5e1a3149 | 1172 | free_page((unsigned long)page_list); |
4c8cf318 | 1173 | return ret; |
22af48cf XY |
1174 | |
1175 | } | |
1176 | ||
1177 | static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v, | |
ae967246 | 1178 | struct vhost_iotlb *iotlb, |
22af48cf XY |
1179 | struct vhost_iotlb_msg *msg) |
1180 | { | |
d8945ec4 | 1181 | struct vdpa_device *vdpa = v->vdpa; |
22af48cf XY |
1182 | |
1183 | if (msg->iova < v->range.first || !msg->size || | |
1184 | msg->iova > U64_MAX - msg->size + 1 || | |
1185 | msg->iova + msg->size - 1 > v->range.last) | |
1186 | return -EINVAL; | |
1187 | ||
1188 | if (vhost_iotlb_itree_first(iotlb, msg->iova, | |
1189 | msg->iova + msg->size - 1)) | |
1190 | return -EEXIST; | |
1191 | ||
d8945ec4 | 1192 | if (vdpa->use_va) |
ae967246 | 1193 | return vhost_vdpa_va_map(v, iotlb, msg->iova, msg->size, |
d8945ec4 XY |
1194 | msg->uaddr, msg->perm); |
1195 | ||
ae967246 | 1196 | return vhost_vdpa_pa_map(v, iotlb, msg->iova, msg->size, msg->uaddr, |
22af48cf | 1197 | msg->perm); |
4c8cf318 TB |
1198 | } |
1199 | ||
91233ad7 | 1200 | static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev, u32 asid, |
4c8cf318 TB |
1201 | struct vhost_iotlb_msg *msg) |
1202 | { | |
1203 | struct vhost_vdpa *v = container_of(dev, struct vhost_vdpa, vdev); | |
25abc060 JW |
1204 | struct vdpa_device *vdpa = v->vdpa; |
1205 | const struct vdpa_config_ops *ops = vdpa->config; | |
aaca8373 GD |
1206 | struct vhost_iotlb *iotlb = NULL; |
1207 | struct vhost_vdpa_as *as = NULL; | |
4c8cf318 TB |
1208 | int r = 0; |
1209 | ||
a9d06452 XY |
1210 | mutex_lock(&dev->mutex); |
1211 | ||
4c8cf318 TB |
1212 | r = vhost_dev_check_owner(dev); |
1213 | if (r) | |
a9d06452 | 1214 | goto unlock; |
4c8cf318 | 1215 | |
aaca8373 GD |
1216 | if (msg->type == VHOST_IOTLB_UPDATE || |
1217 | msg->type == VHOST_IOTLB_BATCH_BEGIN) { | |
1218 | as = vhost_vdpa_find_alloc_as(v, asid); | |
1219 | if (!as) { | |
1220 | dev_err(&v->dev, "can't find and alloc asid %d\n", | |
1221 | asid); | |
1222 | r = -EINVAL; | |
1223 | goto unlock; | |
1224 | } | |
1225 | iotlb = &as->iotlb; | |
1226 | } else | |
1227 | iotlb = asid_to_iotlb(v, asid); | |
1228 | ||
1229 | if ((v->in_batch && v->batch_asid != asid) || !iotlb) { | |
1230 | if (v->in_batch && v->batch_asid != asid) { | |
1231 | dev_info(&v->dev, "batch id %d asid %d\n", | |
1232 | v->batch_asid, asid); | |
1233 | } | |
1234 | if (!iotlb) | |
1235 | dev_err(&v->dev, "no iotlb for asid %d\n", asid); | |
1236 | r = -EINVAL; | |
1237 | goto unlock; | |
1238 | } | |
1239 | ||
4c8cf318 TB |
1240 | switch (msg->type) { |
1241 | case VHOST_IOTLB_UPDATE: | |
ae967246 | 1242 | r = vhost_vdpa_process_iotlb_update(v, iotlb, msg); |
4c8cf318 TB |
1243 | break; |
1244 | case VHOST_IOTLB_INVALIDATE: | |
ae967246 | 1245 | vhost_vdpa_unmap(v, iotlb, msg->iova, msg->size); |
4c8cf318 | 1246 | break; |
25abc060 | 1247 | case VHOST_IOTLB_BATCH_BEGIN: |
aaca8373 | 1248 | v->batch_asid = asid; |
25abc060 JW |
1249 | v->in_batch = true; |
1250 | break; | |
1251 | case VHOST_IOTLB_BATCH_END: | |
1252 | if (v->in_batch && ops->set_map) | |
aaca8373 | 1253 | ops->set_map(vdpa, asid, iotlb); |
25abc060 JW |
1254 | v->in_batch = false; |
1255 | break; | |
4c8cf318 TB |
1256 | default: |
1257 | r = -EINVAL; | |
1258 | break; | |
1259 | } | |
a9d06452 XY |
1260 | unlock: |
1261 | mutex_unlock(&dev->mutex); | |
4c8cf318 TB |
1262 | |
1263 | return r; | |
1264 | } | |
1265 | ||
1266 | static ssize_t vhost_vdpa_chr_write_iter(struct kiocb *iocb, | |
1267 | struct iov_iter *from) | |
1268 | { | |
1269 | struct file *file = iocb->ki_filp; | |
1270 | struct vhost_vdpa *v = file->private_data; | |
1271 | struct vhost_dev *dev = &v->vdev; | |
1272 | ||
1273 | return vhost_chr_write_iter(dev, from); | |
1274 | } | |
1275 | ||
1276 | static int vhost_vdpa_alloc_domain(struct vhost_vdpa *v) | |
1277 | { | |
1278 | struct vdpa_device *vdpa = v->vdpa; | |
1279 | const struct vdpa_config_ops *ops = vdpa->config; | |
1280 | struct device *dma_dev = vdpa_get_dma_dev(vdpa); | |
94a11504 | 1281 | const struct bus_type *bus; |
4c8cf318 TB |
1282 | int ret; |
1283 | ||
1284 | /* Device want to do DMA by itself */ | |
1285 | if (ops->set_map || ops->dma_map) | |
1286 | return 0; | |
1287 | ||
1288 | bus = dma_dev->bus; | |
1289 | if (!bus) | |
1290 | return -EFAULT; | |
1291 | ||
6830a6ab AK |
1292 | if (!device_iommu_capable(dma_dev, IOMMU_CAP_CACHE_COHERENCY)) { |
1293 | dev_warn_once(&v->dev, | |
1294 | "Failed to allocate domain, device is not IOMMU cache coherent capable\n"); | |
4c8cf318 | 1295 | return -ENOTSUPP; |
6830a6ab | 1296 | } |
4c8cf318 TB |
1297 | |
1298 | v->domain = iommu_domain_alloc(bus); | |
1299 | if (!v->domain) | |
1300 | return -EIO; | |
1301 | ||
1302 | ret = iommu_attach_device(v->domain, dma_dev); | |
1303 | if (ret) | |
1304 | goto err_attach; | |
1305 | ||
1306 | return 0; | |
1307 | ||
1308 | err_attach: | |
1309 | iommu_domain_free(v->domain); | |
5a522150 | 1310 | v->domain = NULL; |
4c8cf318 TB |
1311 | return ret; |
1312 | } | |
1313 | ||
1314 | static void vhost_vdpa_free_domain(struct vhost_vdpa *v) | |
1315 | { | |
1316 | struct vdpa_device *vdpa = v->vdpa; | |
1317 | struct device *dma_dev = vdpa_get_dma_dev(vdpa); | |
1318 | ||
1319 | if (v->domain) { | |
1320 | iommu_detach_device(v->domain, dma_dev); | |
1321 | iommu_domain_free(v->domain); | |
1322 | } | |
1323 | ||
1324 | v->domain = NULL; | |
1325 | } | |
1326 | ||
1b48dc03 JW |
1327 | static void vhost_vdpa_set_iova_range(struct vhost_vdpa *v) |
1328 | { | |
1329 | struct vdpa_iova_range *range = &v->range; | |
1b48dc03 JW |
1330 | struct vdpa_device *vdpa = v->vdpa; |
1331 | const struct vdpa_config_ops *ops = vdpa->config; | |
1332 | ||
1333 | if (ops->get_iova_range) { | |
1334 | *range = ops->get_iova_range(vdpa); | |
bc9a05ee CH |
1335 | } else if (v->domain && v->domain->geometry.force_aperture) { |
1336 | range->first = v->domain->geometry.aperture_start; | |
1337 | range->last = v->domain->geometry.aperture_end; | |
1b48dc03 JW |
1338 | } else { |
1339 | range->first = 0; | |
1340 | range->last = ULLONG_MAX; | |
1341 | } | |
1342 | } | |
1343 | ||
3d569879 GD |
1344 | static void vhost_vdpa_cleanup(struct vhost_vdpa *v) |
1345 | { | |
aaca8373 GD |
1346 | struct vhost_vdpa_as *as; |
1347 | u32 asid; | |
1348 | ||
aaca8373 GD |
1349 | for (asid = 0; asid < v->vdpa->nas; asid++) { |
1350 | as = asid_to_as(v, asid); | |
1351 | if (as) | |
1352 | vhost_vdpa_remove_as(v, asid); | |
1353 | } | |
c070c191 | 1354 | |
5a522150 | 1355 | vhost_vdpa_free_domain(v); |
c070c191 SG |
1356 | vhost_dev_cleanup(&v->vdev); |
1357 | kfree(v->vdev.vqs); | |
bc91df5c | 1358 | v->vdev.vqs = NULL; |
3d569879 GD |
1359 | } |
1360 | ||
4c8cf318 TB |
1361 | static int vhost_vdpa_open(struct inode *inode, struct file *filep) |
1362 | { | |
1363 | struct vhost_vdpa *v; | |
1364 | struct vhost_dev *dev; | |
1365 | struct vhost_virtqueue **vqs; | |
81d46d69 L |
1366 | int r, opened; |
1367 | u32 i, nvqs; | |
4c8cf318 TB |
1368 | |
1369 | v = container_of(inode->i_cdev, struct vhost_vdpa, cdev); | |
4c8cf318 TB |
1370 | |
1371 | opened = atomic_cmpxchg(&v->opened, 0, 1); | |
1372 | if (opened) | |
1373 | return -EBUSY; | |
1374 | ||
1375 | nvqs = v->nvqs; | |
7f05630d XY |
1376 | r = vhost_vdpa_reset(v); |
1377 | if (r) | |
1378 | goto err; | |
4c8cf318 TB |
1379 | |
1380 | vqs = kmalloc_array(nvqs, sizeof(*vqs), GFP_KERNEL); | |
1381 | if (!vqs) { | |
1382 | r = -ENOMEM; | |
1383 | goto err; | |
1384 | } | |
1385 | ||
1386 | dev = &v->vdev; | |
1387 | for (i = 0; i < nvqs; i++) { | |
1388 | vqs[i] = &v->vqs[i]; | |
1389 | vqs[i]->handle_kick = handle_vq_kick; | |
1390 | } | |
01fcb1cb | 1391 | vhost_dev_init(dev, vqs, nvqs, 0, 0, 0, false, |
4c8cf318 TB |
1392 | vhost_vdpa_process_iotlb_msg); |
1393 | ||
4c8cf318 TB |
1394 | r = vhost_vdpa_alloc_domain(v); |
1395 | if (r) | |
aaca8373 | 1396 | goto err_alloc_domain; |
4c8cf318 | 1397 | |
1b48dc03 JW |
1398 | vhost_vdpa_set_iova_range(v); |
1399 | ||
4c8cf318 TB |
1400 | filep->private_data = v; |
1401 | ||
1402 | return 0; | |
1403 | ||
aaca8373 | 1404 | err_alloc_domain: |
3d569879 | 1405 | vhost_vdpa_cleanup(v); |
4c8cf318 TB |
1406 | err: |
1407 | atomic_dec(&v->opened); | |
1408 | return r; | |
1409 | } | |
1410 | ||
2cf1ba9a ZL |
1411 | static void vhost_vdpa_clean_irq(struct vhost_vdpa *v) |
1412 | { | |
81d46d69 | 1413 | u32 i; |
2cf1ba9a | 1414 | |
4c050286 GD |
1415 | for (i = 0; i < v->nvqs; i++) |
1416 | vhost_vdpa_unsetup_vq_irq(v, i); | |
2cf1ba9a ZL |
1417 | } |
1418 | ||
4c8cf318 TB |
1419 | static int vhost_vdpa_release(struct inode *inode, struct file *filep) |
1420 | { | |
1421 | struct vhost_vdpa *v = filep->private_data; | |
1422 | struct vhost_dev *d = &v->vdev; | |
1423 | ||
1424 | mutex_lock(&d->mutex); | |
1425 | filep->private_data = NULL; | |
ea8f17e4 | 1426 | vhost_vdpa_clean_irq(v); |
4c8cf318 TB |
1427 | vhost_vdpa_reset(v); |
1428 | vhost_dev_stop(&v->vdev); | |
9067de47 | 1429 | vhost_vdpa_unbind_mm(v); |
776f3950 | 1430 | vhost_vdpa_config_put(v); |
037d4305 | 1431 | vhost_vdpa_cleanup(v); |
4c8cf318 TB |
1432 | mutex_unlock(&d->mutex); |
1433 | ||
1434 | atomic_dec(&v->opened); | |
1435 | complete(&v->completion); | |
1436 | ||
1437 | return 0; | |
1438 | } | |
1439 | ||
4b4e4867 | 1440 | #ifdef CONFIG_MMU |
ddd89d0a JW |
1441 | static vm_fault_t vhost_vdpa_fault(struct vm_fault *vmf) |
1442 | { | |
1443 | struct vhost_vdpa *v = vmf->vma->vm_file->private_data; | |
1444 | struct vdpa_device *vdpa = v->vdpa; | |
1445 | const struct vdpa_config_ops *ops = vdpa->config; | |
1446 | struct vdpa_notification_area notify; | |
1447 | struct vm_area_struct *vma = vmf->vma; | |
1448 | u16 index = vma->vm_pgoff; | |
1449 | ||
1450 | notify = ops->get_vq_notification(vdpa, index); | |
1451 | ||
1452 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
1453 | if (remap_pfn_range(vma, vmf->address & PAGE_MASK, | |
729ce5a5 | 1454 | PFN_DOWN(notify.addr), PAGE_SIZE, |
ddd89d0a JW |
1455 | vma->vm_page_prot)) |
1456 | return VM_FAULT_SIGBUS; | |
1457 | ||
1458 | return VM_FAULT_NOPAGE; | |
1459 | } | |
1460 | ||
1461 | static const struct vm_operations_struct vhost_vdpa_vm_ops = { | |
1462 | .fault = vhost_vdpa_fault, | |
1463 | }; | |
1464 | ||
1465 | static int vhost_vdpa_mmap(struct file *file, struct vm_area_struct *vma) | |
1466 | { | |
1467 | struct vhost_vdpa *v = vma->vm_file->private_data; | |
1468 | struct vdpa_device *vdpa = v->vdpa; | |
1469 | const struct vdpa_config_ops *ops = vdpa->config; | |
1470 | struct vdpa_notification_area notify; | |
c09cc2c3 | 1471 | unsigned long index = vma->vm_pgoff; |
ddd89d0a JW |
1472 | |
1473 | if (vma->vm_end - vma->vm_start != PAGE_SIZE) | |
1474 | return -EINVAL; | |
1475 | if ((vma->vm_flags & VM_SHARED) == 0) | |
1476 | return -EINVAL; | |
1477 | if (vma->vm_flags & VM_READ) | |
1478 | return -EINVAL; | |
1479 | if (index > 65535) | |
1480 | return -EINVAL; | |
1481 | if (!ops->get_vq_notification) | |
1482 | return -ENOTSUPP; | |
1483 | ||
1484 | /* To be safe and easily modelled by userspace, We only | |
1485 | * support the doorbell which sits on the page boundary and | |
1486 | * does not share the page with other registers. | |
1487 | */ | |
1488 | notify = ops->get_vq_notification(vdpa, index); | |
1489 | if (notify.addr & (PAGE_SIZE - 1)) | |
1490 | return -EINVAL; | |
1491 | if (vma->vm_end - vma->vm_start != notify.size) | |
1492 | return -ENOTSUPP; | |
1493 | ||
1c71222e | 1494 | vm_flags_set(vma, VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP); |
ddd89d0a JW |
1495 | vma->vm_ops = &vhost_vdpa_vm_ops; |
1496 | return 0; | |
1497 | } | |
4b4e4867 | 1498 | #endif /* CONFIG_MMU */ |
ddd89d0a | 1499 | |
4c8cf318 TB |
1500 | static const struct file_operations vhost_vdpa_fops = { |
1501 | .owner = THIS_MODULE, | |
1502 | .open = vhost_vdpa_open, | |
1503 | .release = vhost_vdpa_release, | |
1504 | .write_iter = vhost_vdpa_chr_write_iter, | |
1505 | .unlocked_ioctl = vhost_vdpa_unlocked_ioctl, | |
4b4e4867 | 1506 | #ifdef CONFIG_MMU |
ddd89d0a | 1507 | .mmap = vhost_vdpa_mmap, |
4b4e4867 | 1508 | #endif /* CONFIG_MMU */ |
4c8cf318 TB |
1509 | .compat_ioctl = compat_ptr_ioctl, |
1510 | }; | |
1511 | ||
1512 | static void vhost_vdpa_release_dev(struct device *device) | |
1513 | { | |
1514 | struct vhost_vdpa *v = | |
1515 | container_of(device, struct vhost_vdpa, dev); | |
1516 | ||
1517 | ida_simple_remove(&vhost_vdpa_ida, v->minor); | |
1518 | kfree(v->vqs); | |
1519 | kfree(v); | |
1520 | } | |
1521 | ||
1522 | static int vhost_vdpa_probe(struct vdpa_device *vdpa) | |
1523 | { | |
1524 | const struct vdpa_config_ops *ops = vdpa->config; | |
1525 | struct vhost_vdpa *v; | |
a9974489 | 1526 | int minor; |
3d569879 | 1527 | int i, r; |
4c8cf318 | 1528 | |
aaca8373 GD |
1529 | /* We can't support platform IOMMU device with more than 1 |
1530 | * group or as | |
1531 | */ | |
1532 | if (!ops->set_map && !ops->dma_map && | |
1533 | (vdpa->ngroups > 1 || vdpa->nas > 1)) | |
db9adcbf GD |
1534 | return -EOPNOTSUPP; |
1535 | ||
4c8cf318 TB |
1536 | v = kzalloc(sizeof(*v), GFP_KERNEL | __GFP_RETRY_MAYFAIL); |
1537 | if (!v) | |
1538 | return -ENOMEM; | |
1539 | ||
1540 | minor = ida_simple_get(&vhost_vdpa_ida, 0, | |
1541 | VHOST_VDPA_DEV_MAX, GFP_KERNEL); | |
1542 | if (minor < 0) { | |
1543 | kfree(v); | |
1544 | return minor; | |
1545 | } | |
1546 | ||
1547 | atomic_set(&v->opened, 0); | |
1548 | v->minor = minor; | |
1549 | v->vdpa = vdpa; | |
a9974489 | 1550 | v->nvqs = vdpa->nvqs; |
4c8cf318 TB |
1551 | v->virtio_id = ops->get_device_id(vdpa); |
1552 | ||
1553 | device_initialize(&v->dev); | |
1554 | v->dev.release = vhost_vdpa_release_dev; | |
1555 | v->dev.parent = &vdpa->dev; | |
1556 | v->dev.devt = MKDEV(MAJOR(vhost_vdpa_major), minor); | |
a9974489 | 1557 | v->vqs = kmalloc_array(v->nvqs, sizeof(struct vhost_virtqueue), |
4c8cf318 TB |
1558 | GFP_KERNEL); |
1559 | if (!v->vqs) { | |
1560 | r = -ENOMEM; | |
1561 | goto err; | |
1562 | } | |
1563 | ||
1564 | r = dev_set_name(&v->dev, "vhost-vdpa-%u", minor); | |
1565 | if (r) | |
1566 | goto err; | |
1567 | ||
1568 | cdev_init(&v->cdev, &vhost_vdpa_fops); | |
1569 | v->cdev.owner = THIS_MODULE; | |
1570 | ||
1571 | r = cdev_device_add(&v->cdev, &v->dev); | |
1572 | if (r) | |
1573 | goto err; | |
1574 | ||
1575 | init_completion(&v->completion); | |
1576 | vdpa_set_drvdata(vdpa, v); | |
1577 | ||
3d569879 GD |
1578 | for (i = 0; i < VHOST_VDPA_IOTLB_BUCKETS; i++) |
1579 | INIT_HLIST_HEAD(&v->as[i]); | |
1580 | ||
4c8cf318 TB |
1581 | return 0; |
1582 | ||
1583 | err: | |
1584 | put_device(&v->dev); | |
1585 | return r; | |
1586 | } | |
1587 | ||
1588 | static void vhost_vdpa_remove(struct vdpa_device *vdpa) | |
1589 | { | |
1590 | struct vhost_vdpa *v = vdpa_get_drvdata(vdpa); | |
1591 | int opened; | |
1592 | ||
1593 | cdev_device_del(&v->cdev, &v->dev); | |
1594 | ||
1595 | do { | |
1596 | opened = atomic_cmpxchg(&v->opened, 0, 1); | |
1597 | if (!opened) | |
1598 | break; | |
1599 | wait_for_completion(&v->completion); | |
1600 | } while (1); | |
1601 | ||
1602 | put_device(&v->dev); | |
1603 | } | |
1604 | ||
1605 | static struct vdpa_driver vhost_vdpa_driver = { | |
1606 | .driver = { | |
1607 | .name = "vhost_vdpa", | |
1608 | }, | |
1609 | .probe = vhost_vdpa_probe, | |
1610 | .remove = vhost_vdpa_remove, | |
1611 | }; | |
1612 | ||
1613 | static int __init vhost_vdpa_init(void) | |
1614 | { | |
1615 | int r; | |
1616 | ||
1617 | r = alloc_chrdev_region(&vhost_vdpa_major, 0, VHOST_VDPA_DEV_MAX, | |
1618 | "vhost-vdpa"); | |
1619 | if (r) | |
1620 | goto err_alloc_chrdev; | |
1621 | ||
1622 | r = vdpa_register_driver(&vhost_vdpa_driver); | |
1623 | if (r) | |
1624 | goto err_vdpa_register_driver; | |
1625 | ||
1626 | return 0; | |
1627 | ||
1628 | err_vdpa_register_driver: | |
1629 | unregister_chrdev_region(vhost_vdpa_major, VHOST_VDPA_DEV_MAX); | |
1630 | err_alloc_chrdev: | |
1631 | return r; | |
1632 | } | |
1633 | module_init(vhost_vdpa_init); | |
1634 | ||
1635 | static void __exit vhost_vdpa_exit(void) | |
1636 | { | |
1637 | vdpa_unregister_driver(&vhost_vdpa_driver); | |
1638 | unregister_chrdev_region(vhost_vdpa_major, VHOST_VDPA_DEV_MAX); | |
1639 | } | |
1640 | module_exit(vhost_vdpa_exit); | |
1641 | ||
1642 | MODULE_VERSION("0.0.1"); | |
1643 | MODULE_LICENSE("GPL v2"); | |
1644 | MODULE_AUTHOR("Intel Corporation"); | |
1645 | MODULE_DESCRIPTION("vDPA-based vhost backend for virtio"); |