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