Commit | Line | Data |
---|---|---|
09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e467cde2 RR |
2 | //#define DEBUG |
3 | #include <linux/spinlock.h> | |
5a0e3ad6 | 4 | #include <linux/slab.h> |
e467cde2 RR |
5 | #include <linux/blkdev.h> |
6 | #include <linux/hdreg.h> | |
0c8d44f2 | 7 | #include <linux/module.h> |
4678d6f9 | 8 | #include <linux/mutex.h> |
ad71473d | 9 | #include <linux/interrupt.h> |
e467cde2 RR |
10 | #include <linux/virtio.h> |
11 | #include <linux/virtio_blk.h> | |
3d1266c7 | 12 | #include <linux/scatterlist.h> |
7a7c924c | 13 | #include <linux/string_helpers.h> |
5087a50e | 14 | #include <linux/idr.h> |
1cf7e9c6 | 15 | #include <linux/blk-mq.h> |
ad71473d | 16 | #include <linux/blk-mq-virtio.h> |
1cf7e9c6 | 17 | #include <linux/numa.h> |
55a2415b | 18 | #include <uapi/linux/virtio_ring.h> |
3d1266c7 | 19 | |
4f3bf19c | 20 | #define PART_BITS 4 |
6a27b656 | 21 | #define VQ_NAME_LEN 16 |
1f23816b | 22 | #define MAX_DISCARD_SEGMENTS 256u |
e467cde2 | 23 | |
63947b34 SH |
24 | /* The maximum number of sg elements that fit into a virtqueue */ |
25 | #define VIRTIO_BLK_MAX_SG_ELEMS 32768 | |
26 | ||
02746e26 MG |
27 | #ifdef CONFIG_ARCH_NO_SG_CHAIN |
28 | #define VIRTIO_BLK_INLINE_SG_CNT 0 | |
29 | #else | |
30 | #define VIRTIO_BLK_INLINE_SG_CNT 2 | |
31 | #endif | |
32 | ||
0989c41b | 33 | static unsigned int num_request_queues; |
ead65f76 | 34 | module_param(num_request_queues, uint, 0644); |
0989c41b MG |
35 | MODULE_PARM_DESC(num_request_queues, |
36 | "Limit the number of request queues to use for blk device. " | |
37 | "0 for no limit. " | |
38 | "Values > nr_cpu_ids truncated to nr_cpu_ids."); | |
39 | ||
5087a50e MT |
40 | static int major; |
41 | static DEFINE_IDA(vd_index_ida); | |
42 | ||
2a647bfe | 43 | static struct workqueue_struct *virtblk_wq; |
4f3bf19c | 44 | |
6a27b656 ML |
45 | struct virtio_blk_vq { |
46 | struct virtqueue *vq; | |
47 | spinlock_t lock; | |
48 | char name[VQ_NAME_LEN]; | |
49 | } ____cacheline_aligned_in_smp; | |
50 | ||
bb6ec576 | 51 | struct virtio_blk { |
90b5feb8 SH |
52 | /* |
53 | * This mutex must be held by anything that may run after | |
54 | * virtblk_remove() sets vblk->vdev to NULL. | |
55 | * | |
56 | * blk-mq, virtqueue processing, and sysfs attribute code paths are | |
57 | * shut down before vblk->vdev is set to NULL and therefore do not need | |
58 | * to hold this mutex. | |
59 | */ | |
60 | struct mutex vdev_mutex; | |
e467cde2 | 61 | struct virtio_device *vdev; |
e467cde2 RR |
62 | |
63 | /* The disk structure for the kernel. */ | |
64 | struct gendisk *disk; | |
65 | ||
24d2f903 CH |
66 | /* Block layer tags. */ |
67 | struct blk_mq_tag_set tag_set; | |
68 | ||
7a7c924c CH |
69 | /* Process context for config space updates */ |
70 | struct work_struct config_work; | |
71 | ||
90b5feb8 SH |
72 | /* |
73 | * Tracks references from block_device_operations open/release and | |
74 | * virtio_driver probe/remove so this object can be freed once no | |
75 | * longer in use. | |
76 | */ | |
77 | refcount_t refs; | |
78 | ||
0864b79a RR |
79 | /* What host tells us, plus 2 for header & tailer. */ |
80 | unsigned int sg_elems; | |
81 | ||
5087a50e MT |
82 | /* Ida index - used to track minor number allocations. */ |
83 | int index; | |
6a27b656 ML |
84 | |
85 | /* num of vqs */ | |
86 | int num_vqs; | |
87 | struct virtio_blk_vq *vqs; | |
e467cde2 RR |
88 | }; |
89 | ||
bb6ec576 | 90 | struct virtblk_req { |
97b50a65 | 91 | struct virtio_blk_outhdr out_hdr; |
cb38fa23 | 92 | u8 status; |
02746e26 | 93 | struct sg_table sg_table; |
a98755c5 | 94 | struct scatterlist sg[]; |
e467cde2 RR |
95 | }; |
96 | ||
2a842aca | 97 | static inline blk_status_t virtblk_result(struct virtblk_req *vbr) |
a98755c5 AH |
98 | { |
99 | switch (vbr->status) { | |
100 | case VIRTIO_BLK_S_OK: | |
2a842aca | 101 | return BLK_STS_OK; |
a98755c5 | 102 | case VIRTIO_BLK_S_UNSUPP: |
2a842aca | 103 | return BLK_STS_NOTSUPP; |
a98755c5 | 104 | default: |
2a842aca | 105 | return BLK_STS_IOERR; |
a98755c5 AH |
106 | } |
107 | } | |
108 | ||
97b50a65 CH |
109 | static int virtblk_add_req(struct virtqueue *vq, struct virtblk_req *vbr, |
110 | struct scatterlist *data_sg, bool have_data) | |
111 | { | |
112 | struct scatterlist hdr, status, *sgs[3]; | |
113 | unsigned int num_out = 0, num_in = 0; | |
114 | ||
115 | sg_init_one(&hdr, &vbr->out_hdr, sizeof(vbr->out_hdr)); | |
116 | sgs[num_out++] = &hdr; | |
20af3cfd | 117 | |
0a11cc36 | 118 | if (have_data) { |
19c1c5a6 | 119 | if (vbr->out_hdr.type & cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_OUT)) |
20af3cfd | 120 | sgs[num_out++] = data_sg; |
8f39db9d | 121 | else |
20af3cfd PB |
122 | sgs[num_out + num_in++] = data_sg; |
123 | } | |
124 | ||
8f39db9d PB |
125 | sg_init_one(&status, &vbr->status, sizeof(vbr->status)); |
126 | sgs[num_out + num_in++] = &status; | |
127 | ||
128 | return virtqueue_add_sgs(vq, sgs, num_out, num_in, vbr, GFP_ATOMIC); | |
5ee21a52 PB |
129 | } |
130 | ||
1f23816b CL |
131 | static int virtblk_setup_discard_write_zeroes(struct request *req, bool unmap) |
132 | { | |
133 | unsigned short segments = blk_rq_nr_discard_segments(req); | |
134 | unsigned short n = 0; | |
135 | struct virtio_blk_discard_write_zeroes *range; | |
136 | struct bio *bio; | |
137 | u32 flags = 0; | |
138 | ||
139 | if (unmap) | |
140 | flags |= VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP; | |
141 | ||
142 | range = kmalloc_array(segments, sizeof(*range), GFP_ATOMIC); | |
143 | if (!range) | |
144 | return -ENOMEM; | |
145 | ||
af822aa6 ML |
146 | /* |
147 | * Single max discard segment means multi-range discard isn't | |
148 | * supported, and block layer only runs contiguity merge like | |
149 | * normal RW request. So we can't reply on bio for retrieving | |
150 | * each range info. | |
151 | */ | |
152 | if (queue_max_discard_segments(req->q) == 1) { | |
153 | range[0].flags = cpu_to_le32(flags); | |
154 | range[0].num_sectors = cpu_to_le32(blk_rq_sectors(req)); | |
155 | range[0].sector = cpu_to_le64(blk_rq_pos(req)); | |
156 | n = 1; | |
157 | } else { | |
158 | __rq_for_each_bio(bio, req) { | |
159 | u64 sector = bio->bi_iter.bi_sector; | |
160 | u32 num_sectors = bio->bi_iter.bi_size >> SECTOR_SHIFT; | |
161 | ||
162 | range[n].flags = cpu_to_le32(flags); | |
163 | range[n].num_sectors = cpu_to_le32(num_sectors); | |
164 | range[n].sector = cpu_to_le64(sector); | |
165 | n++; | |
166 | } | |
1f23816b CL |
167 | } |
168 | ||
af822aa6 ML |
169 | WARN_ON_ONCE(n != segments); |
170 | ||
1f23816b CL |
171 | req->special_vec.bv_page = virt_to_page(range); |
172 | req->special_vec.bv_offset = offset_in_page(range); | |
173 | req->special_vec.bv_len = sizeof(*range) * segments; | |
174 | req->rq_flags |= RQF_SPECIAL_PAYLOAD; | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
02746e26 | 179 | static void virtblk_unmap_data(struct request *req, struct virtblk_req *vbr) |
a98755c5 | 180 | { |
02746e26 MG |
181 | if (blk_rq_nr_phys_segments(req)) |
182 | sg_free_table_chained(&vbr->sg_table, | |
183 | VIRTIO_BLK_INLINE_SG_CNT); | |
184 | } | |
185 | ||
186 | static int virtblk_map_data(struct blk_mq_hw_ctx *hctx, struct request *req, | |
187 | struct virtblk_req *vbr) | |
188 | { | |
189 | int err; | |
190 | ||
191 | if (!blk_rq_nr_phys_segments(req)) | |
192 | return 0; | |
a98755c5 | 193 | |
02746e26 MG |
194 | vbr->sg_table.sgl = vbr->sg; |
195 | err = sg_alloc_table_chained(&vbr->sg_table, | |
196 | blk_rq_nr_phys_segments(req), | |
197 | vbr->sg_table.sgl, | |
198 | VIRTIO_BLK_INLINE_SG_CNT); | |
199 | if (unlikely(err)) | |
200 | return -ENOMEM; | |
a98755c5 | 201 | |
02746e26 MG |
202 | return blk_rq_map_sg(hctx->queue, req, vbr->sg_table.sgl); |
203 | } | |
204 | ||
205 | static void virtblk_cleanup_cmd(struct request *req) | |
206 | { | |
358b348b CH |
207 | if (req->rq_flags & RQF_SPECIAL_PAYLOAD) |
208 | kfree(bvec_virt(&req->special_vec)); | |
02746e26 MG |
209 | } |
210 | ||
f0839372 MT |
211 | static blk_status_t virtblk_setup_cmd(struct virtio_device *vdev, |
212 | struct request *req, | |
213 | struct virtblk_req *vbr) | |
02746e26 MG |
214 | { |
215 | bool unmap = false; | |
216 | u32 type; | |
217 | ||
218 | vbr->out_hdr.sector = 0; | |
219 | ||
220 | switch (req_op(req)) { | |
221 | case REQ_OP_READ: | |
222 | type = VIRTIO_BLK_T_IN; | |
223 | vbr->out_hdr.sector = cpu_to_virtio64(vdev, | |
224 | blk_rq_pos(req)); | |
225 | break; | |
226 | case REQ_OP_WRITE: | |
227 | type = VIRTIO_BLK_T_OUT; | |
228 | vbr->out_hdr.sector = cpu_to_virtio64(vdev, | |
229 | blk_rq_pos(req)); | |
230 | break; | |
231 | case REQ_OP_FLUSH: | |
232 | type = VIRTIO_BLK_T_FLUSH; | |
233 | break; | |
234 | case REQ_OP_DISCARD: | |
235 | type = VIRTIO_BLK_T_DISCARD; | |
236 | break; | |
237 | case REQ_OP_WRITE_ZEROES: | |
238 | type = VIRTIO_BLK_T_WRITE_ZEROES; | |
239 | unmap = !(req->cmd_flags & REQ_NOUNMAP); | |
240 | break; | |
241 | case REQ_OP_DRV_IN: | |
242 | type = VIRTIO_BLK_T_GET_ID; | |
243 | break; | |
244 | default: | |
245 | WARN_ON_ONCE(1); | |
246 | return BLK_STS_IOERR; | |
247 | } | |
248 | ||
249 | vbr->out_hdr.type = cpu_to_virtio32(vdev, type); | |
250 | vbr->out_hdr.ioprio = cpu_to_virtio32(vdev, req_get_ioprio(req)); | |
251 | ||
252 | if (type == VIRTIO_BLK_T_DISCARD || type == VIRTIO_BLK_T_WRITE_ZEROES) { | |
253 | if (virtblk_setup_discard_write_zeroes(req, unmap)) | |
254 | return BLK_STS_RESOURCE; | |
255 | } | |
256 | ||
257 | return 0; | |
258 | } | |
259 | ||
260 | static inline void virtblk_request_done(struct request *req) | |
261 | { | |
262 | struct virtblk_req *vbr = blk_mq_rq_to_pdu(req); | |
263 | ||
264 | virtblk_unmap_data(req, vbr); | |
265 | virtblk_cleanup_cmd(req); | |
d19633d5 | 266 | blk_mq_end_request(req, virtblk_result(vbr)); |
a98755c5 AH |
267 | } |
268 | ||
269 | static void virtblk_done(struct virtqueue *vq) | |
e467cde2 RR |
270 | { |
271 | struct virtio_blk *vblk = vq->vdev->priv; | |
1cf7e9c6 | 272 | bool req_done = false; |
6a27b656 | 273 | int qid = vq->index; |
e467cde2 | 274 | struct virtblk_req *vbr; |
e467cde2 | 275 | unsigned long flags; |
a98755c5 | 276 | unsigned int len; |
e467cde2 | 277 | |
6a27b656 | 278 | spin_lock_irqsave(&vblk->vqs[qid].lock, flags); |
bb811108 AH |
279 | do { |
280 | virtqueue_disable_cb(vq); | |
6a27b656 | 281 | while ((vbr = virtqueue_get_buf(vblk->vqs[qid].vq, &len)) != NULL) { |
85dada09 CH |
282 | struct request *req = blk_mq_rq_from_pdu(vbr); |
283 | ||
15f73f5b CH |
284 | if (likely(!blk_should_fake_timeout(req->q))) |
285 | blk_mq_complete_request(req); | |
1cf7e9c6 | 286 | req_done = true; |
33659ebb | 287 | } |
7f03b17d HG |
288 | if (unlikely(virtqueue_is_broken(vq))) |
289 | break; | |
bb811108 | 290 | } while (!virtqueue_enable_cb(vq)); |
1cf7e9c6 | 291 | |
e467cde2 | 292 | /* In case queue is stopped waiting for more buffers. */ |
a98755c5 | 293 | if (req_done) |
1b4a3258 | 294 | blk_mq_start_stopped_hw_queues(vblk->disk->queue, true); |
6a27b656 | 295 | spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags); |
a98755c5 AH |
296 | } |
297 | ||
944e7c87 JA |
298 | static void virtio_commit_rqs(struct blk_mq_hw_ctx *hctx) |
299 | { | |
300 | struct virtio_blk *vblk = hctx->queue->queuedata; | |
301 | struct virtio_blk_vq *vq = &vblk->vqs[hctx->queue_num]; | |
302 | bool kick; | |
303 | ||
304 | spin_lock_irq(&vq->lock); | |
305 | kick = virtqueue_kick_prepare(vq->vq); | |
306 | spin_unlock_irq(&vq->lock); | |
307 | ||
308 | if (kick) | |
309 | virtqueue_notify(vq->vq); | |
310 | } | |
311 | ||
fc17b653 | 312 | static blk_status_t virtio_queue_rq(struct blk_mq_hw_ctx *hctx, |
74c45052 | 313 | const struct blk_mq_queue_data *bd) |
e467cde2 | 314 | { |
1cf7e9c6 | 315 | struct virtio_blk *vblk = hctx->queue->queuedata; |
74c45052 | 316 | struct request *req = bd->rq; |
9d74e257 | 317 | struct virtblk_req *vbr = blk_mq_rq_to_pdu(req); |
1cf7e9c6 | 318 | unsigned long flags; |
0466a39b | 319 | int num; |
6a27b656 | 320 | int qid = hctx->queue_num; |
e8edca6f | 321 | bool notify = false; |
f0839372 MT |
322 | blk_status_t status; |
323 | int err; | |
e467cde2 | 324 | |
1cf7e9c6 | 325 | BUG_ON(req->nr_phys_segments + 2 > vblk->sg_elems); |
e467cde2 | 326 | |
f0839372 MT |
327 | status = virtblk_setup_cmd(vblk->vdev, req, vbr); |
328 | if (unlikely(status)) | |
329 | return status; | |
aebf526b | 330 | |
e2490073 CH |
331 | blk_mq_start_request(req); |
332 | ||
02746e26 MG |
333 | num = virtblk_map_data(hctx, req, vbr); |
334 | if (unlikely(num < 0)) { | |
335 | virtblk_cleanup_cmd(req); | |
336 | return BLK_STS_RESOURCE; | |
e467cde2 RR |
337 | } |
338 | ||
6a27b656 | 339 | spin_lock_irqsave(&vblk->vqs[qid].lock, flags); |
02746e26 | 340 | err = virtblk_add_req(vblk->vqs[qid].vq, vbr, vbr->sg_table.sgl, num); |
5261b85e | 341 | if (err) { |
6a27b656 | 342 | virtqueue_kick(vblk->vqs[qid].vq); |
f5f6b95c HP |
343 | /* Don't stop the queue if -ENOMEM: we may have failed to |
344 | * bounce the buffer due to global resource outage. | |
345 | */ | |
346 | if (err == -ENOSPC) | |
347 | blk_mq_stop_hw_queue(hctx); | |
6a27b656 | 348 | spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags); |
02746e26 MG |
349 | virtblk_unmap_data(req, vbr); |
350 | virtblk_cleanup_cmd(req); | |
3d973b2e HP |
351 | switch (err) { |
352 | case -ENOSPC: | |
86ff7c2a | 353 | return BLK_STS_DEV_RESOURCE; |
3d973b2e HP |
354 | case -ENOMEM: |
355 | return BLK_STS_RESOURCE; | |
356 | default: | |
357 | return BLK_STS_IOERR; | |
358 | } | |
a98755c5 AH |
359 | } |
360 | ||
74c45052 | 361 | if (bd->last && virtqueue_kick_prepare(vblk->vqs[qid].vq)) |
e8edca6f | 362 | notify = true; |
6a27b656 | 363 | spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags); |
e8edca6f ML |
364 | |
365 | if (notify) | |
6a27b656 | 366 | virtqueue_notify(vblk->vqs[qid].vq); |
fc17b653 | 367 | return BLK_STS_OK; |
a98755c5 AH |
368 | } |
369 | ||
4cb2ea28 | 370 | /* return id (s/n) string for *disk to *id_str |
371 | */ | |
372 | static int virtblk_get_id(struct gendisk *disk, char *id_str) | |
373 | { | |
374 | struct virtio_blk *vblk = disk->private_data; | |
f9596695 | 375 | struct request_queue *q = vblk->disk->queue; |
4cb2ea28 | 376 | struct request *req; |
e4c4776d | 377 | int err; |
4cb2ea28 | 378 | |
0bf6d96c | 379 | req = blk_mq_alloc_request(q, REQ_OP_DRV_IN, 0); |
f9596695 | 380 | if (IS_ERR(req)) |
4cb2ea28 | 381 | return PTR_ERR(req); |
f9596695 CH |
382 | |
383 | err = blk_rq_map_kern(q, req, id_str, VIRTIO_BLK_ID_BYTES, GFP_KERNEL); | |
384 | if (err) | |
385 | goto out; | |
386 | ||
684da762 | 387 | blk_execute_rq(vblk->disk, req, false); |
2a842aca | 388 | err = blk_status_to_errno(virtblk_result(blk_mq_rq_to_pdu(req))); |
f9596695 | 389 | out: |
0bf6d96c | 390 | blk_mq_free_request(req); |
e4c4776d | 391 | return err; |
4cb2ea28 | 392 | } |
393 | ||
90b5feb8 SH |
394 | static void virtblk_get(struct virtio_blk *vblk) |
395 | { | |
396 | refcount_inc(&vblk->refs); | |
397 | } | |
398 | ||
399 | static void virtblk_put(struct virtio_blk *vblk) | |
400 | { | |
401 | if (refcount_dec_and_test(&vblk->refs)) { | |
402 | ida_simple_remove(&vd_index_ida, vblk->index); | |
403 | mutex_destroy(&vblk->vdev_mutex); | |
404 | kfree(vblk); | |
405 | } | |
406 | } | |
407 | ||
408 | static int virtblk_open(struct block_device *bd, fmode_t mode) | |
409 | { | |
410 | struct virtio_blk *vblk = bd->bd_disk->private_data; | |
411 | int ret = 0; | |
412 | ||
413 | mutex_lock(&vblk->vdev_mutex); | |
414 | ||
415 | if (vblk->vdev) | |
416 | virtblk_get(vblk); | |
417 | else | |
418 | ret = -ENXIO; | |
419 | ||
420 | mutex_unlock(&vblk->vdev_mutex); | |
421 | return ret; | |
422 | } | |
423 | ||
424 | static void virtblk_release(struct gendisk *disk, fmode_t mode) | |
425 | { | |
426 | struct virtio_blk *vblk = disk->private_data; | |
427 | ||
428 | virtblk_put(vblk); | |
429 | } | |
430 | ||
135da0b0 CB |
431 | /* We provide getgeo only to please some old bootloader/partitioning tools */ |
432 | static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo) | |
433 | { | |
48e4043d | 434 | struct virtio_blk *vblk = bd->bd_disk->private_data; |
90b5feb8 SH |
435 | int ret = 0; |
436 | ||
437 | mutex_lock(&vblk->vdev_mutex); | |
438 | ||
439 | if (!vblk->vdev) { | |
440 | ret = -ENXIO; | |
441 | goto out; | |
442 | } | |
48e4043d RH |
443 | |
444 | /* see if the host passed in geometry config */ | |
855e0c52 RR |
445 | if (virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_GEOMETRY)) { |
446 | virtio_cread(vblk->vdev, struct virtio_blk_config, | |
447 | geometry.cylinders, &geo->cylinders); | |
448 | virtio_cread(vblk->vdev, struct virtio_blk_config, | |
449 | geometry.heads, &geo->heads); | |
450 | virtio_cread(vblk->vdev, struct virtio_blk_config, | |
451 | geometry.sectors, &geo->sectors); | |
48e4043d RH |
452 | } else { |
453 | /* some standard values, similar to sd */ | |
454 | geo->heads = 1 << 6; | |
455 | geo->sectors = 1 << 5; | |
456 | geo->cylinders = get_capacity(bd->bd_disk) >> 11; | |
457 | } | |
90b5feb8 SH |
458 | out: |
459 | mutex_unlock(&vblk->vdev_mutex); | |
460 | return ret; | |
135da0b0 CB |
461 | } |
462 | ||
83d5cde4 | 463 | static const struct block_device_operations virtblk_fops = { |
135da0b0 | 464 | .owner = THIS_MODULE, |
90b5feb8 SH |
465 | .open = virtblk_open, |
466 | .release = virtblk_release, | |
135da0b0 | 467 | .getgeo = virtblk_getgeo, |
e467cde2 RR |
468 | }; |
469 | ||
d50ed907 CB |
470 | static int index_to_minor(int index) |
471 | { | |
472 | return index << PART_BITS; | |
473 | } | |
474 | ||
5087a50e MT |
475 | static int minor_to_index(int minor) |
476 | { | |
477 | return minor >> PART_BITS; | |
478 | } | |
479 | ||
e982c4d0 HR |
480 | static ssize_t serial_show(struct device *dev, |
481 | struct device_attribute *attr, char *buf) | |
a5eb9e4f RH |
482 | { |
483 | struct gendisk *disk = dev_to_disk(dev); | |
484 | int err; | |
485 | ||
486 | /* sysfs gives us a PAGE_SIZE buffer */ | |
487 | BUILD_BUG_ON(PAGE_SIZE < VIRTIO_BLK_ID_BYTES); | |
488 | ||
489 | buf[VIRTIO_BLK_ID_BYTES] = '\0'; | |
490 | err = virtblk_get_id(disk, buf); | |
491 | if (!err) | |
492 | return strlen(buf); | |
493 | ||
494 | if (err == -EIO) /* Unsupported? Make it empty. */ | |
495 | return 0; | |
496 | ||
497 | return err; | |
498 | } | |
393c525b | 499 | |
e982c4d0 | 500 | static DEVICE_ATTR_RO(serial); |
a5eb9e4f | 501 | |
daf2a501 SH |
502 | /* The queue's logical block size must be set before calling this */ |
503 | static void virtblk_update_capacity(struct virtio_blk *vblk, bool resize) | |
7a7c924c | 504 | { |
7a7c924c CH |
505 | struct virtio_device *vdev = vblk->vdev; |
506 | struct request_queue *q = vblk->disk->queue; | |
507 | char cap_str_2[10], cap_str_10[10]; | |
1046d304 | 508 | unsigned long long nblocks; |
b9f28d86 | 509 | u64 capacity; |
7a7c924c CH |
510 | |
511 | /* Host must always specify the capacity. */ | |
855e0c52 | 512 | virtio_cread(vdev, struct virtio_blk_config, capacity, &capacity); |
7a7c924c | 513 | |
1046d304 SH |
514 | nblocks = DIV_ROUND_UP_ULL(capacity, queue_logical_block_size(q) >> 9); |
515 | ||
516 | string_get_size(nblocks, queue_logical_block_size(q), | |
b9f28d86 | 517 | STRING_UNITS_2, cap_str_2, sizeof(cap_str_2)); |
1046d304 | 518 | string_get_size(nblocks, queue_logical_block_size(q), |
b9f28d86 | 519 | STRING_UNITS_10, cap_str_10, sizeof(cap_str_10)); |
7a7c924c CH |
520 | |
521 | dev_notice(&vdev->dev, | |
daf2a501 SH |
522 | "[%s] %s%llu %d-byte logical blocks (%s/%s)\n", |
523 | vblk->disk->disk_name, | |
524 | resize ? "new size: " : "", | |
1046d304 SH |
525 | nblocks, |
526 | queue_logical_block_size(q), | |
527 | cap_str_10, | |
528 | cap_str_2); | |
7a7c924c | 529 | |
449f4ec9 | 530 | set_capacity_and_notify(vblk->disk, capacity); |
daf2a501 SH |
531 | } |
532 | ||
533 | static void virtblk_config_changed_work(struct work_struct *work) | |
534 | { | |
535 | struct virtio_blk *vblk = | |
536 | container_of(work, struct virtio_blk, config_work); | |
daf2a501 SH |
537 | |
538 | virtblk_update_capacity(vblk, true); | |
7a7c924c CH |
539 | } |
540 | ||
541 | static void virtblk_config_changed(struct virtio_device *vdev) | |
542 | { | |
543 | struct virtio_blk *vblk = vdev->priv; | |
544 | ||
545 | queue_work(virtblk_wq, &vblk->config_work); | |
546 | } | |
547 | ||
6abd6e5a AS |
548 | static int init_vq(struct virtio_blk *vblk) |
549 | { | |
2ff98449 | 550 | int err; |
6a27b656 ML |
551 | int i; |
552 | vq_callback_t **callbacks; | |
553 | const char **names; | |
554 | struct virtqueue **vqs; | |
555 | unsigned short num_vqs; | |
556 | struct virtio_device *vdev = vblk->vdev; | |
ad71473d | 557 | struct irq_affinity desc = { 0, }; |
6a27b656 ML |
558 | |
559 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_MQ, | |
560 | struct virtio_blk_config, num_queues, | |
561 | &num_vqs); | |
562 | if (err) | |
563 | num_vqs = 1; | |
6ae6ff6f | 564 | if (!err && !num_vqs) { |
63b4ffa4 | 565 | dev_err(&vdev->dev, "MQ advertised but zero queues reported\n"); |
6ae6ff6f JW |
566 | return -EINVAL; |
567 | } | |
6a27b656 | 568 | |
0989c41b MG |
569 | num_vqs = min_t(unsigned int, |
570 | min_not_zero(num_request_queues, nr_cpu_ids), | |
571 | num_vqs); | |
bf348f9b | 572 | |
668866b6 | 573 | vblk->vqs = kmalloc_array(num_vqs, sizeof(*vblk->vqs), GFP_KERNEL); |
347a5293 MH |
574 | if (!vblk->vqs) |
575 | return -ENOMEM; | |
6a27b656 | 576 | |
668866b6 ME |
577 | names = kmalloc_array(num_vqs, sizeof(*names), GFP_KERNEL); |
578 | callbacks = kmalloc_array(num_vqs, sizeof(*callbacks), GFP_KERNEL); | |
579 | vqs = kmalloc_array(num_vqs, sizeof(*vqs), GFP_KERNEL); | |
347a5293 MH |
580 | if (!names || !callbacks || !vqs) { |
581 | err = -ENOMEM; | |
582 | goto out; | |
583 | } | |
6abd6e5a | 584 | |
6a27b656 ML |
585 | for (i = 0; i < num_vqs; i++) { |
586 | callbacks[i] = virtblk_done; | |
587 | snprintf(vblk->vqs[i].name, VQ_NAME_LEN, "req.%d", i); | |
588 | names[i] = vblk->vqs[i].name; | |
589 | } | |
590 | ||
591 | /* Discover virtqueues and write information to configuration. */ | |
9b2bbdb2 | 592 | err = virtio_find_vqs(vdev, num_vqs, vqs, callbacks, names, &desc); |
6a27b656 | 593 | if (err) |
347a5293 | 594 | goto out; |
6abd6e5a | 595 | |
6a27b656 ML |
596 | for (i = 0; i < num_vqs; i++) { |
597 | spin_lock_init(&vblk->vqs[i].lock); | |
598 | vblk->vqs[i].vq = vqs[i]; | |
599 | } | |
600 | vblk->num_vqs = num_vqs; | |
601 | ||
347a5293 | 602 | out: |
6a27b656 | 603 | kfree(vqs); |
6a27b656 | 604 | kfree(callbacks); |
6a27b656 | 605 | kfree(names); |
6a27b656 ML |
606 | if (err) |
607 | kfree(vblk->vqs); | |
6abd6e5a AS |
608 | return err; |
609 | } | |
610 | ||
c0aa3e09 RM |
611 | /* |
612 | * Legacy naming scheme used for virtio devices. We are stuck with it for | |
613 | * virtio blk but don't ever use it for any new driver. | |
614 | */ | |
615 | static int virtblk_name_format(char *prefix, int index, char *buf, int buflen) | |
616 | { | |
617 | const int base = 'z' - 'a' + 1; | |
618 | char *begin = buf + strlen(prefix); | |
619 | char *end = buf + buflen; | |
620 | char *p; | |
621 | int unit; | |
622 | ||
623 | p = end - 1; | |
624 | *p = '\0'; | |
625 | unit = base; | |
626 | do { | |
627 | if (p == begin) | |
628 | return -EINVAL; | |
629 | *--p = 'a' + (index % unit); | |
630 | index = (index / unit) - 1; | |
631 | } while (index >= 0); | |
632 | ||
633 | memmove(begin, p, end - p); | |
634 | memcpy(buf, prefix, strlen(prefix)); | |
635 | ||
636 | return 0; | |
637 | } | |
638 | ||
cd5d5038 PB |
639 | static int virtblk_get_cache_mode(struct virtio_device *vdev) |
640 | { | |
641 | u8 writeback; | |
642 | int err; | |
643 | ||
855e0c52 RR |
644 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE, |
645 | struct virtio_blk_config, wce, | |
646 | &writeback); | |
592002f5 MT |
647 | |
648 | /* | |
649 | * If WCE is not configurable and flush is not available, | |
650 | * assume no writeback cache is in use. | |
651 | */ | |
cd5d5038 | 652 | if (err) |
592002f5 | 653 | writeback = virtio_has_feature(vdev, VIRTIO_BLK_F_FLUSH); |
cd5d5038 PB |
654 | |
655 | return writeback; | |
656 | } | |
657 | ||
658 | static void virtblk_update_cache_mode(struct virtio_device *vdev) | |
659 | { | |
660 | u8 writeback = virtblk_get_cache_mode(vdev); | |
661 | struct virtio_blk *vblk = vdev->priv; | |
662 | ||
ad9126ac | 663 | blk_queue_write_cache(vblk->disk->queue, writeback, false); |
cd5d5038 PB |
664 | } |
665 | ||
666 | static const char *const virtblk_cache_types[] = { | |
667 | "write through", "write back" | |
668 | }; | |
669 | ||
670 | static ssize_t | |
e982c4d0 HR |
671 | cache_type_store(struct device *dev, struct device_attribute *attr, |
672 | const char *buf, size_t count) | |
cd5d5038 PB |
673 | { |
674 | struct gendisk *disk = dev_to_disk(dev); | |
675 | struct virtio_blk *vblk = disk->private_data; | |
676 | struct virtio_device *vdev = vblk->vdev; | |
677 | int i; | |
cd5d5038 PB |
678 | |
679 | BUG_ON(!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_CONFIG_WCE)); | |
f53d5aa0 | 680 | i = sysfs_match_string(virtblk_cache_types, buf); |
cd5d5038 | 681 | if (i < 0) |
f53d5aa0 | 682 | return i; |
cd5d5038 | 683 | |
855e0c52 | 684 | virtio_cwrite8(vdev, offsetof(struct virtio_blk_config, wce), i); |
cd5d5038 PB |
685 | virtblk_update_cache_mode(vdev); |
686 | return count; | |
687 | } | |
688 | ||
689 | static ssize_t | |
e982c4d0 | 690 | cache_type_show(struct device *dev, struct device_attribute *attr, char *buf) |
cd5d5038 PB |
691 | { |
692 | struct gendisk *disk = dev_to_disk(dev); | |
693 | struct virtio_blk *vblk = disk->private_data; | |
694 | u8 writeback = virtblk_get_cache_mode(vblk->vdev); | |
695 | ||
696 | BUG_ON(writeback >= ARRAY_SIZE(virtblk_cache_types)); | |
f1aa12f5 | 697 | return sysfs_emit(buf, "%s\n", virtblk_cache_types[writeback]); |
cd5d5038 PB |
698 | } |
699 | ||
e982c4d0 HR |
700 | static DEVICE_ATTR_RW(cache_type); |
701 | ||
702 | static struct attribute *virtblk_attrs[] = { | |
703 | &dev_attr_serial.attr, | |
704 | &dev_attr_cache_type.attr, | |
705 | NULL, | |
706 | }; | |
707 | ||
708 | static umode_t virtblk_attrs_are_visible(struct kobject *kobj, | |
709 | struct attribute *a, int n) | |
710 | { | |
4ce79063 | 711 | struct device *dev = kobj_to_dev(kobj); |
e982c4d0 HR |
712 | struct gendisk *disk = dev_to_disk(dev); |
713 | struct virtio_blk *vblk = disk->private_data; | |
714 | struct virtio_device *vdev = vblk->vdev; | |
715 | ||
716 | if (a == &dev_attr_cache_type.attr && | |
717 | !virtio_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE)) | |
718 | return S_IRUGO; | |
719 | ||
720 | return a->mode; | |
721 | } | |
722 | ||
723 | static const struct attribute_group virtblk_attr_group = { | |
724 | .attrs = virtblk_attrs, | |
725 | .is_visible = virtblk_attrs_are_visible, | |
726 | }; | |
727 | ||
728 | static const struct attribute_group *virtblk_attr_groups[] = { | |
729 | &virtblk_attr_group, | |
730 | NULL, | |
731 | }; | |
cd5d5038 | 732 | |
ad71473d CH |
733 | static int virtblk_map_queues(struct blk_mq_tag_set *set) |
734 | { | |
735 | struct virtio_blk *vblk = set->driver_data; | |
736 | ||
9bc00750 DZ |
737 | return blk_mq_virtio_map_queues(&set->map[HCTX_TYPE_DEFAULT], |
738 | vblk->vdev, 0); | |
ad71473d CH |
739 | } |
740 | ||
f363b089 | 741 | static const struct blk_mq_ops virtio_mq_ops = { |
1cf7e9c6 | 742 | .queue_rq = virtio_queue_rq, |
944e7c87 | 743 | .commit_rqs = virtio_commit_rqs, |
5124c285 | 744 | .complete = virtblk_request_done, |
ad71473d | 745 | .map_queues = virtblk_map_queues, |
1cf7e9c6 JA |
746 | }; |
747 | ||
24d2f903 CH |
748 | static unsigned int virtblk_queue_depth; |
749 | module_param_named(queue_depth, virtblk_queue_depth, uint, 0444); | |
1cf7e9c6 | 750 | |
8d85fce7 | 751 | static int virtblk_probe(struct virtio_device *vdev) |
e467cde2 RR |
752 | { |
753 | struct virtio_blk *vblk; | |
69740c8b | 754 | struct request_queue *q; |
5087a50e | 755 | int err, index; |
a98755c5 | 756 | |
fd1068e1 | 757 | u32 v, blk_size, max_size, sg_elems, opt_io_size; |
69740c8b CH |
758 | u16 min_io_size; |
759 | u8 physical_block_exp, alignment_offset; | |
d1e9aa9c | 760 | unsigned int queue_depth; |
e467cde2 | 761 | |
ff631988 MT |
762 | if (!vdev->config->get) { |
763 | dev_err(&vdev->dev, "%s failure: config access disabled\n", | |
764 | __func__); | |
765 | return -EINVAL; | |
766 | } | |
767 | ||
5087a50e MT |
768 | err = ida_simple_get(&vd_index_ida, 0, minor_to_index(1 << MINORBITS), |
769 | GFP_KERNEL); | |
770 | if (err < 0) | |
771 | goto out; | |
772 | index = err; | |
4f3bf19c | 773 | |
0864b79a | 774 | /* We need to know how many segments before we allocate. */ |
855e0c52 RR |
775 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SEG_MAX, |
776 | struct virtio_blk_config, seg_max, | |
777 | &sg_elems); | |
a5b365a6 CH |
778 | |
779 | /* We need at least one SG element, whatever they say. */ | |
780 | if (err || !sg_elems) | |
0864b79a RR |
781 | sg_elems = 1; |
782 | ||
63947b34 SH |
783 | /* Prevent integer overflows and honor max vq size */ |
784 | sg_elems = min_t(u32, sg_elems, VIRTIO_BLK_MAX_SG_ELEMS - 2); | |
785 | ||
786 | /* We need extra sg elements at head and tail. */ | |
0864b79a | 787 | sg_elems += 2; |
1cf7e9c6 | 788 | vdev->priv = vblk = kmalloc(sizeof(*vblk), GFP_KERNEL); |
e467cde2 RR |
789 | if (!vblk) { |
790 | err = -ENOMEM; | |
5087a50e | 791 | goto out_free_index; |
e467cde2 RR |
792 | } |
793 | ||
90b5feb8 SH |
794 | /* This reference is dropped in virtblk_remove(). */ |
795 | refcount_set(&vblk->refs, 1); | |
796 | mutex_init(&vblk->vdev_mutex); | |
797 | ||
e467cde2 | 798 | vblk->vdev = vdev; |
0864b79a | 799 | vblk->sg_elems = sg_elems; |
a98755c5 | 800 | |
7a7c924c | 801 | INIT_WORK(&vblk->config_work, virtblk_config_changed_work); |
e467cde2 | 802 | |
6abd6e5a AS |
803 | err = init_vq(vblk); |
804 | if (err) | |
e467cde2 | 805 | goto out_free_vblk; |
e467cde2 | 806 | |
fc4324b4 | 807 | /* Default queue sizing is to fill the ring. */ |
6105d1fe | 808 | if (!virtblk_queue_depth) { |
d1e9aa9c | 809 | queue_depth = vblk->vqs[0].vq->num_free; |
fc4324b4 RR |
810 | /* ... but without indirect descs, we use 2 descs per req */ |
811 | if (!virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC)) | |
d1e9aa9c JQ |
812 | queue_depth /= 2; |
813 | } else { | |
814 | queue_depth = virtblk_queue_depth; | |
fc4324b4 | 815 | } |
24d2f903 CH |
816 | |
817 | memset(&vblk->tag_set, 0, sizeof(vblk->tag_set)); | |
818 | vblk->tag_set.ops = &virtio_mq_ops; | |
d1e9aa9c | 819 | vblk->tag_set.queue_depth = queue_depth; |
24d2f903 CH |
820 | vblk->tag_set.numa_node = NUMA_NO_NODE; |
821 | vblk->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; | |
822 | vblk->tag_set.cmd_size = | |
1cf7e9c6 | 823 | sizeof(struct virtblk_req) + |
02746e26 | 824 | sizeof(struct scatterlist) * VIRTIO_BLK_INLINE_SG_CNT; |
24d2f903 | 825 | vblk->tag_set.driver_data = vblk; |
6a27b656 | 826 | vblk->tag_set.nr_hw_queues = vblk->num_vqs; |
1cf7e9c6 | 827 | |
24d2f903 CH |
828 | err = blk_mq_alloc_tag_set(&vblk->tag_set); |
829 | if (err) | |
89a5f065 | 830 | goto out_free_vq; |
24d2f903 | 831 | |
89a5f065 CH |
832 | vblk->disk = blk_mq_alloc_disk(&vblk->tag_set, vblk); |
833 | if (IS_ERR(vblk->disk)) { | |
834 | err = PTR_ERR(vblk->disk); | |
24d2f903 | 835 | goto out_free_tags; |
e467cde2 | 836 | } |
89a5f065 | 837 | q = vblk->disk->queue; |
7d116b62 | 838 | |
c0aa3e09 | 839 | virtblk_name_format("vd", index, vblk->disk->disk_name, DISK_NAME_LEN); |
d50ed907 | 840 | |
e467cde2 | 841 | vblk->disk->major = major; |
d50ed907 | 842 | vblk->disk->first_minor = index_to_minor(index); |
89a5f065 | 843 | vblk->disk->minors = 1 << PART_BITS; |
e467cde2 RR |
844 | vblk->disk->private_data = vblk; |
845 | vblk->disk->fops = &virtblk_fops; | |
5fa3142d | 846 | vblk->disk->flags |= GENHD_FL_EXT_DEVT; |
5087a50e | 847 | vblk->index = index; |
4f3bf19c | 848 | |
02c42b7a | 849 | /* configure queue flush support */ |
cd5d5038 | 850 | virtblk_update_cache_mode(vdev); |
e467cde2 | 851 | |
3ef53609 CB |
852 | /* If disk is read-only in the host, the guest should obey */ |
853 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO)) | |
854 | set_disk_ro(vblk->disk, 1); | |
855 | ||
0864b79a | 856 | /* We can handle whatever the host told us to handle. */ |
ee714f2d | 857 | blk_queue_max_segments(q, vblk->sg_elems-2); |
0864b79a | 858 | |
4b7f7e20 | 859 | /* No real sector limit. */ |
ee714f2d | 860 | blk_queue_max_hw_sectors(q, -1U); |
4b7f7e20 | 861 | |
fd1068e1 JR |
862 | max_size = virtio_max_dma_size(vdev); |
863 | ||
a586d4f6 RR |
864 | /* Host can optionally specify maximum segment size and number of |
865 | * segments. */ | |
855e0c52 RR |
866 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SIZE_MAX, |
867 | struct virtio_blk_config, size_max, &v); | |
e467cde2 | 868 | if (!err) |
fd1068e1 JR |
869 | max_size = min(max_size, v); |
870 | ||
871 | blk_queue_max_segment_size(q, max_size); | |
e467cde2 | 872 | |
066f4d82 | 873 | /* Host can optionally specify the block size of the device */ |
855e0c52 RR |
874 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_BLK_SIZE, |
875 | struct virtio_blk_config, blk_size, | |
876 | &blk_size); | |
57a13a5b XY |
877 | if (!err) { |
878 | err = blk_validate_block_size(blk_size); | |
879 | if (err) { | |
880 | dev_err(&vdev->dev, | |
881 | "virtio_blk: invalid block size: 0x%x\n", | |
882 | blk_size); | |
883 | goto out_cleanup_disk; | |
884 | } | |
885 | ||
69740c8b | 886 | blk_queue_logical_block_size(q, blk_size); |
57a13a5b | 887 | } else |
69740c8b CH |
888 | blk_size = queue_logical_block_size(q); |
889 | ||
890 | /* Use topology information if available */ | |
855e0c52 RR |
891 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY, |
892 | struct virtio_blk_config, physical_block_exp, | |
893 | &physical_block_exp); | |
69740c8b CH |
894 | if (!err && physical_block_exp) |
895 | blk_queue_physical_block_size(q, | |
896 | blk_size * (1 << physical_block_exp)); | |
897 | ||
855e0c52 RR |
898 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY, |
899 | struct virtio_blk_config, alignment_offset, | |
900 | &alignment_offset); | |
69740c8b CH |
901 | if (!err && alignment_offset) |
902 | blk_queue_alignment_offset(q, blk_size * alignment_offset); | |
903 | ||
855e0c52 RR |
904 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY, |
905 | struct virtio_blk_config, min_io_size, | |
906 | &min_io_size); | |
69740c8b CH |
907 | if (!err && min_io_size) |
908 | blk_queue_io_min(q, blk_size * min_io_size); | |
909 | ||
855e0c52 RR |
910 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY, |
911 | struct virtio_blk_config, opt_io_size, | |
912 | &opt_io_size); | |
69740c8b CH |
913 | if (!err && opt_io_size) |
914 | blk_queue_io_opt(q, blk_size * opt_io_size); | |
915 | ||
1f23816b CL |
916 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_DISCARD)) { |
917 | q->limits.discard_granularity = blk_size; | |
918 | ||
919 | virtio_cread(vdev, struct virtio_blk_config, | |
920 | discard_sector_alignment, &v); | |
921 | q->limits.discard_alignment = v ? v << SECTOR_SHIFT : 0; | |
922 | ||
923 | virtio_cread(vdev, struct virtio_blk_config, | |
924 | max_discard_sectors, &v); | |
925 | blk_queue_max_discard_sectors(q, v ? v : UINT_MAX); | |
926 | ||
927 | virtio_cread(vdev, struct virtio_blk_config, max_discard_seg, | |
928 | &v); | |
929 | blk_queue_max_discard_segments(q, | |
930 | min_not_zero(v, | |
931 | MAX_DISCARD_SEGMENTS)); | |
932 | ||
933 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, q); | |
934 | } | |
935 | ||
936 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_WRITE_ZEROES)) { | |
937 | virtio_cread(vdev, struct virtio_blk_config, | |
938 | max_write_zeroes_sectors, &v); | |
939 | blk_queue_max_write_zeroes_sectors(q, v ? v : UINT_MAX); | |
940 | } | |
941 | ||
daf2a501 | 942 | virtblk_update_capacity(vblk, false); |
7a11370e MT |
943 | virtio_device_ready(vdev); |
944 | ||
dbb301f9 LC |
945 | err = device_add_disk(&vdev->dev, vblk->disk, virtblk_attr_groups); |
946 | if (err) | |
947 | goto out_cleanup_disk; | |
948 | ||
e467cde2 RR |
949 | return 0; |
950 | ||
dbb301f9 | 951 | out_cleanup_disk: |
82e89ea0 | 952 | blk_cleanup_disk(vblk->disk); |
24d2f903 CH |
953 | out_free_tags: |
954 | blk_mq_free_tag_set(&vblk->tag_set); | |
e467cde2 | 955 | out_free_vq: |
d2a7ddda | 956 | vdev->config->del_vqs(vdev); |
e7eea44e | 957 | kfree(vblk->vqs); |
e467cde2 RR |
958 | out_free_vblk: |
959 | kfree(vblk); | |
5087a50e MT |
960 | out_free_index: |
961 | ida_simple_remove(&vd_index_ida, index); | |
e467cde2 RR |
962 | out: |
963 | return err; | |
964 | } | |
965 | ||
8d85fce7 | 966 | static void virtblk_remove(struct virtio_device *vdev) |
e467cde2 RR |
967 | { |
968 | struct virtio_blk *vblk = vdev->priv; | |
e467cde2 | 969 | |
cc74f719 MT |
970 | /* Make sure no work handler is accessing the device. */ |
971 | flush_work(&vblk->config_work); | |
7a7c924c | 972 | |
02e2b124 | 973 | del_gendisk(vblk->disk); |
89a5f065 | 974 | blk_cleanup_disk(vblk->disk); |
24d2f903 CH |
975 | blk_mq_free_tag_set(&vblk->tag_set); |
976 | ||
90b5feb8 SH |
977 | mutex_lock(&vblk->vdev_mutex); |
978 | ||
6e5aa7ef RR |
979 | /* Stop all the virtqueues. */ |
980 | vdev->config->reset(vdev); | |
981 | ||
90b5feb8 SH |
982 | /* Virtqueues are stopped, nothing can use vblk->vdev anymore. */ |
983 | vblk->vdev = NULL; | |
984 | ||
d2a7ddda | 985 | vdev->config->del_vqs(vdev); |
6a27b656 | 986 | kfree(vblk->vqs); |
f4953fe6 | 987 | |
90b5feb8 SH |
988 | mutex_unlock(&vblk->vdev_mutex); |
989 | ||
990 | virtblk_put(vblk); | |
e467cde2 RR |
991 | } |
992 | ||
89107000 | 993 | #ifdef CONFIG_PM_SLEEP |
f8fb5bc2 AS |
994 | static int virtblk_freeze(struct virtio_device *vdev) |
995 | { | |
996 | struct virtio_blk *vblk = vdev->priv; | |
997 | ||
998 | /* Ensure we don't receive any more interrupts */ | |
999 | vdev->config->reset(vdev); | |
1000 | ||
cc74f719 | 1001 | /* Make sure no work handler is accessing the device. */ |
f8fb5bc2 AS |
1002 | flush_work(&vblk->config_work); |
1003 | ||
9b3e9905 | 1004 | blk_mq_quiesce_queue(vblk->disk->queue); |
f8fb5bc2 AS |
1005 | |
1006 | vdev->config->del_vqs(vdev); | |
b71ba22e XY |
1007 | kfree(vblk->vqs); |
1008 | ||
f8fb5bc2 AS |
1009 | return 0; |
1010 | } | |
1011 | ||
1012 | static int virtblk_restore(struct virtio_device *vdev) | |
1013 | { | |
1014 | struct virtio_blk *vblk = vdev->priv; | |
1015 | int ret; | |
1016 | ||
f8fb5bc2 | 1017 | ret = init_vq(vdev->priv); |
6d62c37f MT |
1018 | if (ret) |
1019 | return ret; | |
1020 | ||
1021 | virtio_device_ready(vdev); | |
1cf7e9c6 | 1022 | |
9b3e9905 | 1023 | blk_mq_unquiesce_queue(vblk->disk->queue); |
6d62c37f | 1024 | return 0; |
f8fb5bc2 AS |
1025 | } |
1026 | #endif | |
1027 | ||
47483e25 | 1028 | static const struct virtio_device_id id_table[] = { |
e467cde2 RR |
1029 | { VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID }, |
1030 | { 0 }, | |
1031 | }; | |
1032 | ||
19c1c5a6 | 1033 | static unsigned int features_legacy[] = { |
02c42b7a | 1034 | VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY, |
97b50a65 | 1035 | VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, |
592002f5 | 1036 | VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE, |
1f23816b | 1037 | VIRTIO_BLK_F_MQ, VIRTIO_BLK_F_DISCARD, VIRTIO_BLK_F_WRITE_ZEROES, |
19c1c5a6 MT |
1038 | } |
1039 | ; | |
1040 | static unsigned int features[] = { | |
1041 | VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY, | |
1042 | VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, | |
592002f5 | 1043 | VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE, |
1f23816b | 1044 | VIRTIO_BLK_F_MQ, VIRTIO_BLK_F_DISCARD, VIRTIO_BLK_F_WRITE_ZEROES, |
c45a6816 RR |
1045 | }; |
1046 | ||
8d85fce7 | 1047 | static struct virtio_driver virtio_blk = { |
19c1c5a6 MT |
1048 | .feature_table = features, |
1049 | .feature_table_size = ARRAY_SIZE(features), | |
1050 | .feature_table_legacy = features_legacy, | |
1051 | .feature_table_size_legacy = ARRAY_SIZE(features_legacy), | |
1052 | .driver.name = KBUILD_MODNAME, | |
1053 | .driver.owner = THIS_MODULE, | |
1054 | .id_table = id_table, | |
1055 | .probe = virtblk_probe, | |
1056 | .remove = virtblk_remove, | |
1057 | .config_changed = virtblk_config_changed, | |
89107000 | 1058 | #ifdef CONFIG_PM_SLEEP |
19c1c5a6 MT |
1059 | .freeze = virtblk_freeze, |
1060 | .restore = virtblk_restore, | |
f8fb5bc2 | 1061 | #endif |
e467cde2 RR |
1062 | }; |
1063 | ||
1064 | static int __init init(void) | |
1065 | { | |
7a7c924c CH |
1066 | int error; |
1067 | ||
1068 | virtblk_wq = alloc_workqueue("virtio-blk", 0, 0); | |
1069 | if (!virtblk_wq) | |
1070 | return -ENOMEM; | |
1071 | ||
4f3bf19c | 1072 | major = register_blkdev(0, "virtblk"); |
7a7c924c CH |
1073 | if (major < 0) { |
1074 | error = major; | |
1075 | goto out_destroy_workqueue; | |
1076 | } | |
1077 | ||
1078 | error = register_virtio_driver(&virtio_blk); | |
1079 | if (error) | |
1080 | goto out_unregister_blkdev; | |
1081 | return 0; | |
1082 | ||
1083 | out_unregister_blkdev: | |
1084 | unregister_blkdev(major, "virtblk"); | |
1085 | out_destroy_workqueue: | |
1086 | destroy_workqueue(virtblk_wq); | |
1087 | return error; | |
e467cde2 RR |
1088 | } |
1089 | ||
1090 | static void __exit fini(void) | |
1091 | { | |
1092 | unregister_virtio_driver(&virtio_blk); | |
38f37b57 | 1093 | unregister_blkdev(major, "virtblk"); |
7a7c924c | 1094 | destroy_workqueue(virtblk_wq); |
e467cde2 RR |
1095 | } |
1096 | module_init(init); | |
1097 | module_exit(fini); | |
1098 | ||
1099 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1100 | MODULE_DESCRIPTION("Virtio block driver"); | |
1101 | MODULE_LICENSE("GPL"); |