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Commit | Line | Data |
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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 | |
5087a50e MT |
24 | static int major; |
25 | static DEFINE_IDA(vd_index_ida); | |
26 | ||
2a647bfe | 27 | static struct workqueue_struct *virtblk_wq; |
4f3bf19c | 28 | |
6a27b656 ML |
29 | struct virtio_blk_vq { |
30 | struct virtqueue *vq; | |
31 | spinlock_t lock; | |
32 | char name[VQ_NAME_LEN]; | |
33 | } ____cacheline_aligned_in_smp; | |
34 | ||
bb6ec576 | 35 | struct virtio_blk { |
90b5feb8 SH |
36 | /* |
37 | * This mutex must be held by anything that may run after | |
38 | * virtblk_remove() sets vblk->vdev to NULL. | |
39 | * | |
40 | * blk-mq, virtqueue processing, and sysfs attribute code paths are | |
41 | * shut down before vblk->vdev is set to NULL and therefore do not need | |
42 | * to hold this mutex. | |
43 | */ | |
44 | struct mutex vdev_mutex; | |
e467cde2 | 45 | struct virtio_device *vdev; |
e467cde2 RR |
46 | |
47 | /* The disk structure for the kernel. */ | |
48 | struct gendisk *disk; | |
49 | ||
24d2f903 CH |
50 | /* Block layer tags. */ |
51 | struct blk_mq_tag_set tag_set; | |
52 | ||
7a7c924c CH |
53 | /* Process context for config space updates */ |
54 | struct work_struct config_work; | |
55 | ||
90b5feb8 SH |
56 | /* |
57 | * Tracks references from block_device_operations open/release and | |
58 | * virtio_driver probe/remove so this object can be freed once no | |
59 | * longer in use. | |
60 | */ | |
61 | refcount_t refs; | |
62 | ||
0864b79a RR |
63 | /* What host tells us, plus 2 for header & tailer. */ |
64 | unsigned int sg_elems; | |
65 | ||
5087a50e MT |
66 | /* Ida index - used to track minor number allocations. */ |
67 | int index; | |
6a27b656 ML |
68 | |
69 | /* num of vqs */ | |
70 | int num_vqs; | |
71 | struct virtio_blk_vq *vqs; | |
e467cde2 RR |
72 | }; |
73 | ||
bb6ec576 | 74 | struct virtblk_req { |
97b50a65 | 75 | struct virtio_blk_outhdr out_hdr; |
cb38fa23 | 76 | u8 status; |
a98755c5 | 77 | struct scatterlist sg[]; |
e467cde2 RR |
78 | }; |
79 | ||
2a842aca | 80 | static inline blk_status_t virtblk_result(struct virtblk_req *vbr) |
a98755c5 AH |
81 | { |
82 | switch (vbr->status) { | |
83 | case VIRTIO_BLK_S_OK: | |
2a842aca | 84 | return BLK_STS_OK; |
a98755c5 | 85 | case VIRTIO_BLK_S_UNSUPP: |
2a842aca | 86 | return BLK_STS_NOTSUPP; |
a98755c5 | 87 | default: |
2a842aca | 88 | return BLK_STS_IOERR; |
a98755c5 AH |
89 | } |
90 | } | |
91 | ||
97b50a65 CH |
92 | static int virtblk_add_req(struct virtqueue *vq, struct virtblk_req *vbr, |
93 | struct scatterlist *data_sg, bool have_data) | |
94 | { | |
95 | struct scatterlist hdr, status, *sgs[3]; | |
96 | unsigned int num_out = 0, num_in = 0; | |
97 | ||
98 | sg_init_one(&hdr, &vbr->out_hdr, sizeof(vbr->out_hdr)); | |
99 | sgs[num_out++] = &hdr; | |
20af3cfd | 100 | |
0a11cc36 | 101 | if (have_data) { |
19c1c5a6 | 102 | if (vbr->out_hdr.type & cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_OUT)) |
20af3cfd | 103 | sgs[num_out++] = data_sg; |
8f39db9d | 104 | else |
20af3cfd PB |
105 | sgs[num_out + num_in++] = data_sg; |
106 | } | |
107 | ||
8f39db9d PB |
108 | sg_init_one(&status, &vbr->status, sizeof(vbr->status)); |
109 | sgs[num_out + num_in++] = &status; | |
110 | ||
111 | return virtqueue_add_sgs(vq, sgs, num_out, num_in, vbr, GFP_ATOMIC); | |
5ee21a52 PB |
112 | } |
113 | ||
1f23816b CL |
114 | static int virtblk_setup_discard_write_zeroes(struct request *req, bool unmap) |
115 | { | |
116 | unsigned short segments = blk_rq_nr_discard_segments(req); | |
117 | unsigned short n = 0; | |
118 | struct virtio_blk_discard_write_zeroes *range; | |
119 | struct bio *bio; | |
120 | u32 flags = 0; | |
121 | ||
122 | if (unmap) | |
123 | flags |= VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP; | |
124 | ||
125 | range = kmalloc_array(segments, sizeof(*range), GFP_ATOMIC); | |
126 | if (!range) | |
127 | return -ENOMEM; | |
128 | ||
129 | __rq_for_each_bio(bio, req) { | |
130 | u64 sector = bio->bi_iter.bi_sector; | |
131 | u32 num_sectors = bio->bi_iter.bi_size >> SECTOR_SHIFT; | |
132 | ||
133 | range[n].flags = cpu_to_le32(flags); | |
134 | range[n].num_sectors = cpu_to_le32(num_sectors); | |
135 | range[n].sector = cpu_to_le64(sector); | |
136 | n++; | |
137 | } | |
138 | ||
139 | req->special_vec.bv_page = virt_to_page(range); | |
140 | req->special_vec.bv_offset = offset_in_page(range); | |
141 | req->special_vec.bv_len = sizeof(*range) * segments; | |
142 | req->rq_flags |= RQF_SPECIAL_PAYLOAD; | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
5124c285 | 147 | static inline void virtblk_request_done(struct request *req) |
a98755c5 | 148 | { |
9d74e257 | 149 | struct virtblk_req *vbr = blk_mq_rq_to_pdu(req); |
a98755c5 | 150 | |
1f23816b CL |
151 | if (req->rq_flags & RQF_SPECIAL_PAYLOAD) { |
152 | kfree(page_address(req->special_vec.bv_page) + | |
153 | req->special_vec.bv_offset); | |
154 | } | |
155 | ||
d19633d5 | 156 | blk_mq_end_request(req, virtblk_result(vbr)); |
a98755c5 AH |
157 | } |
158 | ||
159 | static void virtblk_done(struct virtqueue *vq) | |
e467cde2 RR |
160 | { |
161 | struct virtio_blk *vblk = vq->vdev->priv; | |
1cf7e9c6 | 162 | bool req_done = false; |
6a27b656 | 163 | int qid = vq->index; |
e467cde2 | 164 | struct virtblk_req *vbr; |
e467cde2 | 165 | unsigned long flags; |
a98755c5 | 166 | unsigned int len; |
e467cde2 | 167 | |
6a27b656 | 168 | spin_lock_irqsave(&vblk->vqs[qid].lock, flags); |
bb811108 AH |
169 | do { |
170 | virtqueue_disable_cb(vq); | |
6a27b656 | 171 | while ((vbr = virtqueue_get_buf(vblk->vqs[qid].vq, &len)) != NULL) { |
85dada09 CH |
172 | struct request *req = blk_mq_rq_from_pdu(vbr); |
173 | ||
08e0029a | 174 | blk_mq_complete_request(req); |
1cf7e9c6 | 175 | req_done = true; |
33659ebb | 176 | } |
7f03b17d HG |
177 | if (unlikely(virtqueue_is_broken(vq))) |
178 | break; | |
bb811108 | 179 | } while (!virtqueue_enable_cb(vq)); |
1cf7e9c6 | 180 | |
e467cde2 | 181 | /* In case queue is stopped waiting for more buffers. */ |
a98755c5 | 182 | if (req_done) |
1b4a3258 | 183 | blk_mq_start_stopped_hw_queues(vblk->disk->queue, true); |
6a27b656 | 184 | spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags); |
a98755c5 AH |
185 | } |
186 | ||
944e7c87 JA |
187 | static void virtio_commit_rqs(struct blk_mq_hw_ctx *hctx) |
188 | { | |
189 | struct virtio_blk *vblk = hctx->queue->queuedata; | |
190 | struct virtio_blk_vq *vq = &vblk->vqs[hctx->queue_num]; | |
191 | bool kick; | |
192 | ||
193 | spin_lock_irq(&vq->lock); | |
194 | kick = virtqueue_kick_prepare(vq->vq); | |
195 | spin_unlock_irq(&vq->lock); | |
196 | ||
197 | if (kick) | |
198 | virtqueue_notify(vq->vq); | |
199 | } | |
200 | ||
fc17b653 | 201 | static blk_status_t virtio_queue_rq(struct blk_mq_hw_ctx *hctx, |
74c45052 | 202 | const struct blk_mq_queue_data *bd) |
e467cde2 | 203 | { |
1cf7e9c6 | 204 | struct virtio_blk *vblk = hctx->queue->queuedata; |
74c45052 | 205 | struct request *req = bd->rq; |
9d74e257 | 206 | struct virtblk_req *vbr = blk_mq_rq_to_pdu(req); |
1cf7e9c6 | 207 | unsigned long flags; |
20af3cfd | 208 | unsigned int num; |
6a27b656 | 209 | int qid = hctx->queue_num; |
5261b85e | 210 | int err; |
e8edca6f | 211 | bool notify = false; |
1f23816b | 212 | bool unmap = false; |
aebf526b | 213 | u32 type; |
e467cde2 | 214 | |
1cf7e9c6 | 215 | BUG_ON(req->nr_phys_segments + 2 > vblk->sg_elems); |
e467cde2 | 216 | |
aebf526b CH |
217 | switch (req_op(req)) { |
218 | case REQ_OP_READ: | |
219 | case REQ_OP_WRITE: | |
220 | type = 0; | |
221 | break; | |
222 | case REQ_OP_FLUSH: | |
223 | type = VIRTIO_BLK_T_FLUSH; | |
224 | break; | |
1f23816b CL |
225 | case REQ_OP_DISCARD: |
226 | type = VIRTIO_BLK_T_DISCARD; | |
227 | break; | |
228 | case REQ_OP_WRITE_ZEROES: | |
229 | type = VIRTIO_BLK_T_WRITE_ZEROES; | |
230 | unmap = !(req->cmd_flags & REQ_NOUNMAP); | |
231 | break; | |
aebf526b CH |
232 | case REQ_OP_DRV_IN: |
233 | type = VIRTIO_BLK_T_GET_ID; | |
234 | break; | |
235 | default: | |
236 | WARN_ON_ONCE(1); | |
fc17b653 | 237 | return BLK_STS_IOERR; |
e467cde2 RR |
238 | } |
239 | ||
aebf526b CH |
240 | vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, type); |
241 | vbr->out_hdr.sector = type ? | |
242 | 0 : cpu_to_virtio64(vblk->vdev, blk_rq_pos(req)); | |
243 | vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(req)); | |
244 | ||
e2490073 CH |
245 | blk_mq_start_request(req); |
246 | ||
1f23816b CL |
247 | if (type == VIRTIO_BLK_T_DISCARD || type == VIRTIO_BLK_T_WRITE_ZEROES) { |
248 | err = virtblk_setup_discard_write_zeroes(req, unmap); | |
249 | if (err) | |
250 | return BLK_STS_RESOURCE; | |
251 | } | |
252 | ||
85dada09 | 253 | num = blk_rq_map_sg(hctx->queue, req, vbr->sg); |
1cde26f9 | 254 | if (num) { |
85dada09 | 255 | if (rq_data_dir(req) == WRITE) |
19c1c5a6 | 256 | vbr->out_hdr.type |= cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_OUT); |
20af3cfd | 257 | else |
19c1c5a6 | 258 | vbr->out_hdr.type |= cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_IN); |
e467cde2 RR |
259 | } |
260 | ||
6a27b656 | 261 | spin_lock_irqsave(&vblk->vqs[qid].lock, flags); |
782e067d | 262 | err = virtblk_add_req(vblk->vqs[qid].vq, vbr, vbr->sg, num); |
5261b85e | 263 | if (err) { |
6a27b656 | 264 | virtqueue_kick(vblk->vqs[qid].vq); |
f5f6b95c HP |
265 | /* Don't stop the queue if -ENOMEM: we may have failed to |
266 | * bounce the buffer due to global resource outage. | |
267 | */ | |
268 | if (err == -ENOSPC) | |
269 | blk_mq_stop_hw_queue(hctx); | |
6a27b656 | 270 | spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags); |
3d973b2e HP |
271 | switch (err) { |
272 | case -ENOSPC: | |
86ff7c2a | 273 | return BLK_STS_DEV_RESOURCE; |
3d973b2e HP |
274 | case -ENOMEM: |
275 | return BLK_STS_RESOURCE; | |
276 | default: | |
277 | return BLK_STS_IOERR; | |
278 | } | |
a98755c5 AH |
279 | } |
280 | ||
74c45052 | 281 | if (bd->last && virtqueue_kick_prepare(vblk->vqs[qid].vq)) |
e8edca6f | 282 | notify = true; |
6a27b656 | 283 | spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags); |
e8edca6f ML |
284 | |
285 | if (notify) | |
6a27b656 | 286 | virtqueue_notify(vblk->vqs[qid].vq); |
fc17b653 | 287 | return BLK_STS_OK; |
a98755c5 AH |
288 | } |
289 | ||
4cb2ea28 | 290 | /* return id (s/n) string for *disk to *id_str |
291 | */ | |
292 | static int virtblk_get_id(struct gendisk *disk, char *id_str) | |
293 | { | |
294 | struct virtio_blk *vblk = disk->private_data; | |
f9596695 | 295 | struct request_queue *q = vblk->disk->queue; |
4cb2ea28 | 296 | struct request *req; |
e4c4776d | 297 | int err; |
4cb2ea28 | 298 | |
ff005a06 | 299 | req = blk_get_request(q, REQ_OP_DRV_IN, 0); |
f9596695 | 300 | if (IS_ERR(req)) |
4cb2ea28 | 301 | return PTR_ERR(req); |
f9596695 CH |
302 | |
303 | err = blk_rq_map_kern(q, req, id_str, VIRTIO_BLK_ID_BYTES, GFP_KERNEL); | |
304 | if (err) | |
305 | goto out; | |
306 | ||
b7819b92 | 307 | blk_execute_rq(vblk->disk->queue, vblk->disk, req, false); |
2a842aca | 308 | err = blk_status_to_errno(virtblk_result(blk_mq_rq_to_pdu(req))); |
f9596695 | 309 | out: |
e4c4776d | 310 | blk_put_request(req); |
e4c4776d | 311 | return err; |
4cb2ea28 | 312 | } |
313 | ||
90b5feb8 SH |
314 | static void virtblk_get(struct virtio_blk *vblk) |
315 | { | |
316 | refcount_inc(&vblk->refs); | |
317 | } | |
318 | ||
319 | static void virtblk_put(struct virtio_blk *vblk) | |
320 | { | |
321 | if (refcount_dec_and_test(&vblk->refs)) { | |
322 | ida_simple_remove(&vd_index_ida, vblk->index); | |
323 | mutex_destroy(&vblk->vdev_mutex); | |
324 | kfree(vblk); | |
325 | } | |
326 | } | |
327 | ||
328 | static int virtblk_open(struct block_device *bd, fmode_t mode) | |
329 | { | |
330 | struct virtio_blk *vblk = bd->bd_disk->private_data; | |
331 | int ret = 0; | |
332 | ||
333 | mutex_lock(&vblk->vdev_mutex); | |
334 | ||
335 | if (vblk->vdev) | |
336 | virtblk_get(vblk); | |
337 | else | |
338 | ret = -ENXIO; | |
339 | ||
340 | mutex_unlock(&vblk->vdev_mutex); | |
341 | return ret; | |
342 | } | |
343 | ||
344 | static void virtblk_release(struct gendisk *disk, fmode_t mode) | |
345 | { | |
346 | struct virtio_blk *vblk = disk->private_data; | |
347 | ||
348 | virtblk_put(vblk); | |
349 | } | |
350 | ||
135da0b0 CB |
351 | /* We provide getgeo only to please some old bootloader/partitioning tools */ |
352 | static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo) | |
353 | { | |
48e4043d | 354 | struct virtio_blk *vblk = bd->bd_disk->private_data; |
90b5feb8 SH |
355 | int ret = 0; |
356 | ||
357 | mutex_lock(&vblk->vdev_mutex); | |
358 | ||
359 | if (!vblk->vdev) { | |
360 | ret = -ENXIO; | |
361 | goto out; | |
362 | } | |
48e4043d RH |
363 | |
364 | /* see if the host passed in geometry config */ | |
855e0c52 RR |
365 | if (virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_GEOMETRY)) { |
366 | virtio_cread(vblk->vdev, struct virtio_blk_config, | |
367 | geometry.cylinders, &geo->cylinders); | |
368 | virtio_cread(vblk->vdev, struct virtio_blk_config, | |
369 | geometry.heads, &geo->heads); | |
370 | virtio_cread(vblk->vdev, struct virtio_blk_config, | |
371 | geometry.sectors, &geo->sectors); | |
48e4043d RH |
372 | } else { |
373 | /* some standard values, similar to sd */ | |
374 | geo->heads = 1 << 6; | |
375 | geo->sectors = 1 << 5; | |
376 | geo->cylinders = get_capacity(bd->bd_disk) >> 11; | |
377 | } | |
90b5feb8 SH |
378 | out: |
379 | mutex_unlock(&vblk->vdev_mutex); | |
380 | return ret; | |
135da0b0 CB |
381 | } |
382 | ||
83d5cde4 | 383 | static const struct block_device_operations virtblk_fops = { |
135da0b0 | 384 | .owner = THIS_MODULE, |
90b5feb8 SH |
385 | .open = virtblk_open, |
386 | .release = virtblk_release, | |
135da0b0 | 387 | .getgeo = virtblk_getgeo, |
e467cde2 RR |
388 | }; |
389 | ||
d50ed907 CB |
390 | static int index_to_minor(int index) |
391 | { | |
392 | return index << PART_BITS; | |
393 | } | |
394 | ||
5087a50e MT |
395 | static int minor_to_index(int minor) |
396 | { | |
397 | return minor >> PART_BITS; | |
398 | } | |
399 | ||
e982c4d0 HR |
400 | static ssize_t serial_show(struct device *dev, |
401 | struct device_attribute *attr, char *buf) | |
a5eb9e4f RH |
402 | { |
403 | struct gendisk *disk = dev_to_disk(dev); | |
404 | int err; | |
405 | ||
406 | /* sysfs gives us a PAGE_SIZE buffer */ | |
407 | BUILD_BUG_ON(PAGE_SIZE < VIRTIO_BLK_ID_BYTES); | |
408 | ||
409 | buf[VIRTIO_BLK_ID_BYTES] = '\0'; | |
410 | err = virtblk_get_id(disk, buf); | |
411 | if (!err) | |
412 | return strlen(buf); | |
413 | ||
414 | if (err == -EIO) /* Unsupported? Make it empty. */ | |
415 | return 0; | |
416 | ||
417 | return err; | |
418 | } | |
393c525b | 419 | |
e982c4d0 | 420 | static DEVICE_ATTR_RO(serial); |
a5eb9e4f | 421 | |
daf2a501 SH |
422 | /* The queue's logical block size must be set before calling this */ |
423 | static void virtblk_update_capacity(struct virtio_blk *vblk, bool resize) | |
7a7c924c | 424 | { |
7a7c924c CH |
425 | struct virtio_device *vdev = vblk->vdev; |
426 | struct request_queue *q = vblk->disk->queue; | |
427 | char cap_str_2[10], cap_str_10[10]; | |
1046d304 | 428 | unsigned long long nblocks; |
b9f28d86 | 429 | u64 capacity; |
7a7c924c CH |
430 | |
431 | /* Host must always specify the capacity. */ | |
855e0c52 | 432 | virtio_cread(vdev, struct virtio_blk_config, capacity, &capacity); |
7a7c924c CH |
433 | |
434 | /* If capacity is too big, truncate with warning. */ | |
435 | if ((sector_t)capacity != capacity) { | |
436 | dev_warn(&vdev->dev, "Capacity %llu too large: truncating\n", | |
437 | (unsigned long long)capacity); | |
438 | capacity = (sector_t)-1; | |
439 | } | |
440 | ||
1046d304 SH |
441 | nblocks = DIV_ROUND_UP_ULL(capacity, queue_logical_block_size(q) >> 9); |
442 | ||
443 | string_get_size(nblocks, queue_logical_block_size(q), | |
b9f28d86 | 444 | STRING_UNITS_2, cap_str_2, sizeof(cap_str_2)); |
1046d304 | 445 | string_get_size(nblocks, queue_logical_block_size(q), |
b9f28d86 | 446 | STRING_UNITS_10, cap_str_10, sizeof(cap_str_10)); |
7a7c924c CH |
447 | |
448 | dev_notice(&vdev->dev, | |
daf2a501 SH |
449 | "[%s] %s%llu %d-byte logical blocks (%s/%s)\n", |
450 | vblk->disk->disk_name, | |
451 | resize ? "new size: " : "", | |
1046d304 SH |
452 | nblocks, |
453 | queue_logical_block_size(q), | |
454 | cap_str_10, | |
455 | cap_str_2); | |
7a7c924c | 456 | |
662155e2 | 457 | set_capacity_revalidate_and_notify(vblk->disk, capacity, true); |
daf2a501 SH |
458 | } |
459 | ||
460 | static void virtblk_config_changed_work(struct work_struct *work) | |
461 | { | |
462 | struct virtio_blk *vblk = | |
463 | container_of(work, struct virtio_blk, config_work); | |
daf2a501 SH |
464 | |
465 | virtblk_update_capacity(vblk, true); | |
7a7c924c CH |
466 | } |
467 | ||
468 | static void virtblk_config_changed(struct virtio_device *vdev) | |
469 | { | |
470 | struct virtio_blk *vblk = vdev->priv; | |
471 | ||
472 | queue_work(virtblk_wq, &vblk->config_work); | |
473 | } | |
474 | ||
6abd6e5a AS |
475 | static int init_vq(struct virtio_blk *vblk) |
476 | { | |
2ff98449 | 477 | int err; |
6a27b656 ML |
478 | int i; |
479 | vq_callback_t **callbacks; | |
480 | const char **names; | |
481 | struct virtqueue **vqs; | |
482 | unsigned short num_vqs; | |
483 | struct virtio_device *vdev = vblk->vdev; | |
ad71473d | 484 | struct irq_affinity desc = { 0, }; |
6a27b656 ML |
485 | |
486 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_MQ, | |
487 | struct virtio_blk_config, num_queues, | |
488 | &num_vqs); | |
489 | if (err) | |
490 | num_vqs = 1; | |
491 | ||
bf348f9b DZ |
492 | num_vqs = min_t(unsigned int, nr_cpu_ids, num_vqs); |
493 | ||
668866b6 | 494 | vblk->vqs = kmalloc_array(num_vqs, sizeof(*vblk->vqs), GFP_KERNEL); |
347a5293 MH |
495 | if (!vblk->vqs) |
496 | return -ENOMEM; | |
6a27b656 | 497 | |
668866b6 ME |
498 | names = kmalloc_array(num_vqs, sizeof(*names), GFP_KERNEL); |
499 | callbacks = kmalloc_array(num_vqs, sizeof(*callbacks), GFP_KERNEL); | |
500 | vqs = kmalloc_array(num_vqs, sizeof(*vqs), GFP_KERNEL); | |
347a5293 MH |
501 | if (!names || !callbacks || !vqs) { |
502 | err = -ENOMEM; | |
503 | goto out; | |
504 | } | |
6abd6e5a | 505 | |
6a27b656 ML |
506 | for (i = 0; i < num_vqs; i++) { |
507 | callbacks[i] = virtblk_done; | |
508 | snprintf(vblk->vqs[i].name, VQ_NAME_LEN, "req.%d", i); | |
509 | names[i] = vblk->vqs[i].name; | |
510 | } | |
511 | ||
512 | /* Discover virtqueues and write information to configuration. */ | |
9b2bbdb2 | 513 | err = virtio_find_vqs(vdev, num_vqs, vqs, callbacks, names, &desc); |
6a27b656 | 514 | if (err) |
347a5293 | 515 | goto out; |
6abd6e5a | 516 | |
6a27b656 ML |
517 | for (i = 0; i < num_vqs; i++) { |
518 | spin_lock_init(&vblk->vqs[i].lock); | |
519 | vblk->vqs[i].vq = vqs[i]; | |
520 | } | |
521 | vblk->num_vqs = num_vqs; | |
522 | ||
347a5293 | 523 | out: |
6a27b656 | 524 | kfree(vqs); |
6a27b656 | 525 | kfree(callbacks); |
6a27b656 | 526 | kfree(names); |
6a27b656 ML |
527 | if (err) |
528 | kfree(vblk->vqs); | |
6abd6e5a AS |
529 | return err; |
530 | } | |
531 | ||
c0aa3e09 RM |
532 | /* |
533 | * Legacy naming scheme used for virtio devices. We are stuck with it for | |
534 | * virtio blk but don't ever use it for any new driver. | |
535 | */ | |
536 | static int virtblk_name_format(char *prefix, int index, char *buf, int buflen) | |
537 | { | |
538 | const int base = 'z' - 'a' + 1; | |
539 | char *begin = buf + strlen(prefix); | |
540 | char *end = buf + buflen; | |
541 | char *p; | |
542 | int unit; | |
543 | ||
544 | p = end - 1; | |
545 | *p = '\0'; | |
546 | unit = base; | |
547 | do { | |
548 | if (p == begin) | |
549 | return -EINVAL; | |
550 | *--p = 'a' + (index % unit); | |
551 | index = (index / unit) - 1; | |
552 | } while (index >= 0); | |
553 | ||
554 | memmove(begin, p, end - p); | |
555 | memcpy(buf, prefix, strlen(prefix)); | |
556 | ||
557 | return 0; | |
558 | } | |
559 | ||
cd5d5038 PB |
560 | static int virtblk_get_cache_mode(struct virtio_device *vdev) |
561 | { | |
562 | u8 writeback; | |
563 | int err; | |
564 | ||
855e0c52 RR |
565 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE, |
566 | struct virtio_blk_config, wce, | |
567 | &writeback); | |
592002f5 MT |
568 | |
569 | /* | |
570 | * If WCE is not configurable and flush is not available, | |
571 | * assume no writeback cache is in use. | |
572 | */ | |
cd5d5038 | 573 | if (err) |
592002f5 | 574 | writeback = virtio_has_feature(vdev, VIRTIO_BLK_F_FLUSH); |
cd5d5038 PB |
575 | |
576 | return writeback; | |
577 | } | |
578 | ||
579 | static void virtblk_update_cache_mode(struct virtio_device *vdev) | |
580 | { | |
581 | u8 writeback = virtblk_get_cache_mode(vdev); | |
582 | struct virtio_blk *vblk = vdev->priv; | |
583 | ||
ad9126ac | 584 | blk_queue_write_cache(vblk->disk->queue, writeback, false); |
cd5d5038 PB |
585 | revalidate_disk(vblk->disk); |
586 | } | |
587 | ||
588 | static const char *const virtblk_cache_types[] = { | |
589 | "write through", "write back" | |
590 | }; | |
591 | ||
592 | static ssize_t | |
e982c4d0 HR |
593 | cache_type_store(struct device *dev, struct device_attribute *attr, |
594 | const char *buf, size_t count) | |
cd5d5038 PB |
595 | { |
596 | struct gendisk *disk = dev_to_disk(dev); | |
597 | struct virtio_blk *vblk = disk->private_data; | |
598 | struct virtio_device *vdev = vblk->vdev; | |
599 | int i; | |
cd5d5038 PB |
600 | |
601 | BUG_ON(!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_CONFIG_WCE)); | |
f53d5aa0 | 602 | i = sysfs_match_string(virtblk_cache_types, buf); |
cd5d5038 | 603 | if (i < 0) |
f53d5aa0 | 604 | return i; |
cd5d5038 | 605 | |
855e0c52 | 606 | virtio_cwrite8(vdev, offsetof(struct virtio_blk_config, wce), i); |
cd5d5038 PB |
607 | virtblk_update_cache_mode(vdev); |
608 | return count; | |
609 | } | |
610 | ||
611 | static ssize_t | |
e982c4d0 | 612 | cache_type_show(struct device *dev, struct device_attribute *attr, char *buf) |
cd5d5038 PB |
613 | { |
614 | struct gendisk *disk = dev_to_disk(dev); | |
615 | struct virtio_blk *vblk = disk->private_data; | |
616 | u8 writeback = virtblk_get_cache_mode(vblk->vdev); | |
617 | ||
618 | BUG_ON(writeback >= ARRAY_SIZE(virtblk_cache_types)); | |
619 | return snprintf(buf, 40, "%s\n", virtblk_cache_types[writeback]); | |
620 | } | |
621 | ||
e982c4d0 HR |
622 | static DEVICE_ATTR_RW(cache_type); |
623 | ||
624 | static struct attribute *virtblk_attrs[] = { | |
625 | &dev_attr_serial.attr, | |
626 | &dev_attr_cache_type.attr, | |
627 | NULL, | |
628 | }; | |
629 | ||
630 | static umode_t virtblk_attrs_are_visible(struct kobject *kobj, | |
631 | struct attribute *a, int n) | |
632 | { | |
633 | struct device *dev = container_of(kobj, struct device, kobj); | |
634 | struct gendisk *disk = dev_to_disk(dev); | |
635 | struct virtio_blk *vblk = disk->private_data; | |
636 | struct virtio_device *vdev = vblk->vdev; | |
637 | ||
638 | if (a == &dev_attr_cache_type.attr && | |
639 | !virtio_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE)) | |
640 | return S_IRUGO; | |
641 | ||
642 | return a->mode; | |
643 | } | |
644 | ||
645 | static const struct attribute_group virtblk_attr_group = { | |
646 | .attrs = virtblk_attrs, | |
647 | .is_visible = virtblk_attrs_are_visible, | |
648 | }; | |
649 | ||
650 | static const struct attribute_group *virtblk_attr_groups[] = { | |
651 | &virtblk_attr_group, | |
652 | NULL, | |
653 | }; | |
cd5d5038 | 654 | |
d6296d39 CH |
655 | static int virtblk_init_request(struct blk_mq_tag_set *set, struct request *rq, |
656 | unsigned int hctx_idx, unsigned int numa_node) | |
e9b267d9 | 657 | { |
d6296d39 | 658 | struct virtio_blk *vblk = set->driver_data; |
e9b267d9 CH |
659 | struct virtblk_req *vbr = blk_mq_rq_to_pdu(rq); |
660 | ||
661 | sg_init_table(vbr->sg, vblk->sg_elems); | |
662 | return 0; | |
663 | } | |
664 | ||
ad71473d CH |
665 | static int virtblk_map_queues(struct blk_mq_tag_set *set) |
666 | { | |
667 | struct virtio_blk *vblk = set->driver_data; | |
668 | ||
9bc00750 DZ |
669 | return blk_mq_virtio_map_queues(&set->map[HCTX_TYPE_DEFAULT], |
670 | vblk->vdev, 0); | |
ad71473d CH |
671 | } |
672 | ||
f363b089 | 673 | static const struct blk_mq_ops virtio_mq_ops = { |
1cf7e9c6 | 674 | .queue_rq = virtio_queue_rq, |
944e7c87 | 675 | .commit_rqs = virtio_commit_rqs, |
5124c285 | 676 | .complete = virtblk_request_done, |
24d2f903 | 677 | .init_request = virtblk_init_request, |
ad71473d | 678 | .map_queues = virtblk_map_queues, |
1cf7e9c6 JA |
679 | }; |
680 | ||
24d2f903 CH |
681 | static unsigned int virtblk_queue_depth; |
682 | module_param_named(queue_depth, virtblk_queue_depth, uint, 0444); | |
1cf7e9c6 | 683 | |
8d85fce7 | 684 | static int virtblk_probe(struct virtio_device *vdev) |
e467cde2 RR |
685 | { |
686 | struct virtio_blk *vblk; | |
69740c8b | 687 | struct request_queue *q; |
5087a50e | 688 | int err, index; |
a98755c5 | 689 | |
fd1068e1 | 690 | u32 v, blk_size, max_size, sg_elems, opt_io_size; |
69740c8b CH |
691 | u16 min_io_size; |
692 | u8 physical_block_exp, alignment_offset; | |
e467cde2 | 693 | |
a4379fd8 MT |
694 | if (!vdev->config->get) { |
695 | dev_err(&vdev->dev, "%s failure: config access disabled\n", | |
696 | __func__); | |
697 | return -EINVAL; | |
698 | } | |
699 | ||
5087a50e MT |
700 | err = ida_simple_get(&vd_index_ida, 0, minor_to_index(1 << MINORBITS), |
701 | GFP_KERNEL); | |
702 | if (err < 0) | |
703 | goto out; | |
704 | index = err; | |
4f3bf19c | 705 | |
0864b79a | 706 | /* We need to know how many segments before we allocate. */ |
855e0c52 RR |
707 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SEG_MAX, |
708 | struct virtio_blk_config, seg_max, | |
709 | &sg_elems); | |
a5b365a6 CH |
710 | |
711 | /* We need at least one SG element, whatever they say. */ | |
712 | if (err || !sg_elems) | |
0864b79a RR |
713 | sg_elems = 1; |
714 | ||
715 | /* We need an extra sg elements at head and tail. */ | |
716 | sg_elems += 2; | |
1cf7e9c6 | 717 | vdev->priv = vblk = kmalloc(sizeof(*vblk), GFP_KERNEL); |
e467cde2 RR |
718 | if (!vblk) { |
719 | err = -ENOMEM; | |
5087a50e | 720 | goto out_free_index; |
e467cde2 RR |
721 | } |
722 | ||
90b5feb8 SH |
723 | /* This reference is dropped in virtblk_remove(). */ |
724 | refcount_set(&vblk->refs, 1); | |
725 | mutex_init(&vblk->vdev_mutex); | |
726 | ||
e467cde2 | 727 | vblk->vdev = vdev; |
0864b79a | 728 | vblk->sg_elems = sg_elems; |
a98755c5 | 729 | |
7a7c924c | 730 | INIT_WORK(&vblk->config_work, virtblk_config_changed_work); |
e467cde2 | 731 | |
6abd6e5a AS |
732 | err = init_vq(vblk); |
733 | if (err) | |
e467cde2 | 734 | goto out_free_vblk; |
e467cde2 | 735 | |
e467cde2 | 736 | /* FIXME: How many partitions? How long is a piece of string? */ |
4f3bf19c | 737 | vblk->disk = alloc_disk(1 << PART_BITS); |
e467cde2 RR |
738 | if (!vblk->disk) { |
739 | err = -ENOMEM; | |
1cf7e9c6 | 740 | goto out_free_vq; |
e467cde2 RR |
741 | } |
742 | ||
fc4324b4 | 743 | /* Default queue sizing is to fill the ring. */ |
24d2f903 | 744 | if (!virtblk_queue_depth) { |
6a27b656 | 745 | virtblk_queue_depth = vblk->vqs[0].vq->num_free; |
fc4324b4 RR |
746 | /* ... but without indirect descs, we use 2 descs per req */ |
747 | if (!virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC)) | |
24d2f903 | 748 | virtblk_queue_depth /= 2; |
fc4324b4 | 749 | } |
24d2f903 CH |
750 | |
751 | memset(&vblk->tag_set, 0, sizeof(vblk->tag_set)); | |
752 | vblk->tag_set.ops = &virtio_mq_ops; | |
24d2f903 CH |
753 | vblk->tag_set.queue_depth = virtblk_queue_depth; |
754 | vblk->tag_set.numa_node = NUMA_NO_NODE; | |
755 | vblk->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; | |
756 | vblk->tag_set.cmd_size = | |
1cf7e9c6 JA |
757 | sizeof(struct virtblk_req) + |
758 | sizeof(struct scatterlist) * sg_elems; | |
24d2f903 | 759 | vblk->tag_set.driver_data = vblk; |
6a27b656 | 760 | vblk->tag_set.nr_hw_queues = vblk->num_vqs; |
1cf7e9c6 | 761 | |
24d2f903 CH |
762 | err = blk_mq_alloc_tag_set(&vblk->tag_set); |
763 | if (err) | |
764 | goto out_put_disk; | |
765 | ||
6bf6b0aa | 766 | q = blk_mq_init_queue(&vblk->tag_set); |
35b489d3 | 767 | if (IS_ERR(q)) { |
e467cde2 | 768 | err = -ENOMEM; |
24d2f903 | 769 | goto out_free_tags; |
e467cde2 | 770 | } |
6bf6b0aa | 771 | vblk->disk->queue = q; |
e467cde2 | 772 | |
69740c8b | 773 | q->queuedata = vblk; |
7d116b62 | 774 | |
c0aa3e09 | 775 | virtblk_name_format("vd", index, vblk->disk->disk_name, DISK_NAME_LEN); |
d50ed907 | 776 | |
e467cde2 | 777 | vblk->disk->major = major; |
d50ed907 | 778 | vblk->disk->first_minor = index_to_minor(index); |
e467cde2 RR |
779 | vblk->disk->private_data = vblk; |
780 | vblk->disk->fops = &virtblk_fops; | |
5fa3142d | 781 | vblk->disk->flags |= GENHD_FL_EXT_DEVT; |
5087a50e | 782 | vblk->index = index; |
4f3bf19c | 783 | |
02c42b7a | 784 | /* configure queue flush support */ |
cd5d5038 | 785 | virtblk_update_cache_mode(vdev); |
e467cde2 | 786 | |
3ef53609 CB |
787 | /* If disk is read-only in the host, the guest should obey */ |
788 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO)) | |
789 | set_disk_ro(vblk->disk, 1); | |
790 | ||
0864b79a | 791 | /* We can handle whatever the host told us to handle. */ |
ee714f2d | 792 | blk_queue_max_segments(q, vblk->sg_elems-2); |
0864b79a | 793 | |
4b7f7e20 | 794 | /* No real sector limit. */ |
ee714f2d | 795 | blk_queue_max_hw_sectors(q, -1U); |
4b7f7e20 | 796 | |
fd1068e1 JR |
797 | max_size = virtio_max_dma_size(vdev); |
798 | ||
a586d4f6 RR |
799 | /* Host can optionally specify maximum segment size and number of |
800 | * segments. */ | |
855e0c52 RR |
801 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SIZE_MAX, |
802 | struct virtio_blk_config, size_max, &v); | |
e467cde2 | 803 | if (!err) |
fd1068e1 JR |
804 | max_size = min(max_size, v); |
805 | ||
806 | blk_queue_max_segment_size(q, max_size); | |
e467cde2 | 807 | |
066f4d82 | 808 | /* Host can optionally specify the block size of the device */ |
855e0c52 RR |
809 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_BLK_SIZE, |
810 | struct virtio_blk_config, blk_size, | |
811 | &blk_size); | |
066f4d82 | 812 | if (!err) |
69740c8b CH |
813 | blk_queue_logical_block_size(q, blk_size); |
814 | else | |
815 | blk_size = queue_logical_block_size(q); | |
816 | ||
817 | /* Use topology information if available */ | |
855e0c52 RR |
818 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY, |
819 | struct virtio_blk_config, physical_block_exp, | |
820 | &physical_block_exp); | |
69740c8b CH |
821 | if (!err && physical_block_exp) |
822 | blk_queue_physical_block_size(q, | |
823 | blk_size * (1 << physical_block_exp)); | |
824 | ||
855e0c52 RR |
825 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY, |
826 | struct virtio_blk_config, alignment_offset, | |
827 | &alignment_offset); | |
69740c8b CH |
828 | if (!err && alignment_offset) |
829 | blk_queue_alignment_offset(q, blk_size * alignment_offset); | |
830 | ||
855e0c52 RR |
831 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY, |
832 | struct virtio_blk_config, min_io_size, | |
833 | &min_io_size); | |
69740c8b CH |
834 | if (!err && min_io_size) |
835 | blk_queue_io_min(q, blk_size * min_io_size); | |
836 | ||
855e0c52 RR |
837 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY, |
838 | struct virtio_blk_config, opt_io_size, | |
839 | &opt_io_size); | |
69740c8b CH |
840 | if (!err && opt_io_size) |
841 | blk_queue_io_opt(q, blk_size * opt_io_size); | |
842 | ||
1f23816b CL |
843 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_DISCARD)) { |
844 | q->limits.discard_granularity = blk_size; | |
845 | ||
846 | virtio_cread(vdev, struct virtio_blk_config, | |
847 | discard_sector_alignment, &v); | |
848 | q->limits.discard_alignment = v ? v << SECTOR_SHIFT : 0; | |
849 | ||
850 | virtio_cread(vdev, struct virtio_blk_config, | |
851 | max_discard_sectors, &v); | |
852 | blk_queue_max_discard_sectors(q, v ? v : UINT_MAX); | |
853 | ||
854 | virtio_cread(vdev, struct virtio_blk_config, max_discard_seg, | |
855 | &v); | |
856 | blk_queue_max_discard_segments(q, | |
857 | min_not_zero(v, | |
858 | MAX_DISCARD_SEGMENTS)); | |
859 | ||
860 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, q); | |
861 | } | |
862 | ||
863 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_WRITE_ZEROES)) { | |
864 | virtio_cread(vdev, struct virtio_blk_config, | |
865 | max_write_zeroes_sectors, &v); | |
866 | blk_queue_max_write_zeroes_sectors(q, v ? v : UINT_MAX); | |
867 | } | |
868 | ||
daf2a501 | 869 | virtblk_update_capacity(vblk, false); |
7a11370e MT |
870 | virtio_device_ready(vdev); |
871 | ||
e982c4d0 | 872 | device_add_disk(&vdev->dev, vblk->disk, virtblk_attr_groups); |
e467cde2 RR |
873 | return 0; |
874 | ||
24d2f903 CH |
875 | out_free_tags: |
876 | blk_mq_free_tag_set(&vblk->tag_set); | |
e467cde2 RR |
877 | out_put_disk: |
878 | put_disk(vblk->disk); | |
e467cde2 | 879 | out_free_vq: |
d2a7ddda | 880 | vdev->config->del_vqs(vdev); |
e467cde2 RR |
881 | out_free_vblk: |
882 | kfree(vblk); | |
5087a50e MT |
883 | out_free_index: |
884 | ida_simple_remove(&vd_index_ida, index); | |
e467cde2 RR |
885 | out: |
886 | return err; | |
887 | } | |
888 | ||
8d85fce7 | 889 | static void virtblk_remove(struct virtio_device *vdev) |
e467cde2 RR |
890 | { |
891 | struct virtio_blk *vblk = vdev->priv; | |
e467cde2 | 892 | |
cc74f719 MT |
893 | /* Make sure no work handler is accessing the device. */ |
894 | flush_work(&vblk->config_work); | |
7a7c924c | 895 | |
02e2b124 | 896 | del_gendisk(vblk->disk); |
483001c7 | 897 | blk_cleanup_queue(vblk->disk->queue); |
02e2b124 | 898 | |
24d2f903 CH |
899 | blk_mq_free_tag_set(&vblk->tag_set); |
900 | ||
90b5feb8 SH |
901 | mutex_lock(&vblk->vdev_mutex); |
902 | ||
6e5aa7ef RR |
903 | /* Stop all the virtqueues. */ |
904 | vdev->config->reset(vdev); | |
905 | ||
90b5feb8 SH |
906 | /* Virtqueues are stopped, nothing can use vblk->vdev anymore. */ |
907 | vblk->vdev = NULL; | |
908 | ||
e467cde2 | 909 | put_disk(vblk->disk); |
d2a7ddda | 910 | vdev->config->del_vqs(vdev); |
6a27b656 | 911 | kfree(vblk->vqs); |
f4953fe6 | 912 | |
90b5feb8 SH |
913 | mutex_unlock(&vblk->vdev_mutex); |
914 | ||
915 | virtblk_put(vblk); | |
e467cde2 RR |
916 | } |
917 | ||
89107000 | 918 | #ifdef CONFIG_PM_SLEEP |
f8fb5bc2 AS |
919 | static int virtblk_freeze(struct virtio_device *vdev) |
920 | { | |
921 | struct virtio_blk *vblk = vdev->priv; | |
922 | ||
923 | /* Ensure we don't receive any more interrupts */ | |
924 | vdev->config->reset(vdev); | |
925 | ||
cc74f719 | 926 | /* Make sure no work handler is accessing the device. */ |
f8fb5bc2 AS |
927 | flush_work(&vblk->config_work); |
928 | ||
9b3e9905 | 929 | blk_mq_quiesce_queue(vblk->disk->queue); |
f8fb5bc2 AS |
930 | |
931 | vdev->config->del_vqs(vdev); | |
932 | return 0; | |
933 | } | |
934 | ||
935 | static int virtblk_restore(struct virtio_device *vdev) | |
936 | { | |
937 | struct virtio_blk *vblk = vdev->priv; | |
938 | int ret; | |
939 | ||
f8fb5bc2 | 940 | ret = init_vq(vdev->priv); |
6d62c37f MT |
941 | if (ret) |
942 | return ret; | |
943 | ||
944 | virtio_device_ready(vdev); | |
1cf7e9c6 | 945 | |
9b3e9905 | 946 | blk_mq_unquiesce_queue(vblk->disk->queue); |
6d62c37f | 947 | return 0; |
f8fb5bc2 AS |
948 | } |
949 | #endif | |
950 | ||
47483e25 | 951 | static const struct virtio_device_id id_table[] = { |
e467cde2 RR |
952 | { VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID }, |
953 | { 0 }, | |
954 | }; | |
955 | ||
19c1c5a6 | 956 | static unsigned int features_legacy[] = { |
02c42b7a | 957 | VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY, |
97b50a65 | 958 | VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, |
592002f5 | 959 | VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE, |
1f23816b | 960 | VIRTIO_BLK_F_MQ, VIRTIO_BLK_F_DISCARD, VIRTIO_BLK_F_WRITE_ZEROES, |
19c1c5a6 MT |
961 | } |
962 | ; | |
963 | static unsigned int features[] = { | |
964 | VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY, | |
965 | VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, | |
592002f5 | 966 | VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE, |
1f23816b | 967 | VIRTIO_BLK_F_MQ, VIRTIO_BLK_F_DISCARD, VIRTIO_BLK_F_WRITE_ZEROES, |
c45a6816 RR |
968 | }; |
969 | ||
8d85fce7 | 970 | static struct virtio_driver virtio_blk = { |
19c1c5a6 MT |
971 | .feature_table = features, |
972 | .feature_table_size = ARRAY_SIZE(features), | |
973 | .feature_table_legacy = features_legacy, | |
974 | .feature_table_size_legacy = ARRAY_SIZE(features_legacy), | |
975 | .driver.name = KBUILD_MODNAME, | |
976 | .driver.owner = THIS_MODULE, | |
977 | .id_table = id_table, | |
978 | .probe = virtblk_probe, | |
979 | .remove = virtblk_remove, | |
980 | .config_changed = virtblk_config_changed, | |
89107000 | 981 | #ifdef CONFIG_PM_SLEEP |
19c1c5a6 MT |
982 | .freeze = virtblk_freeze, |
983 | .restore = virtblk_restore, | |
f8fb5bc2 | 984 | #endif |
e467cde2 RR |
985 | }; |
986 | ||
987 | static int __init init(void) | |
988 | { | |
7a7c924c CH |
989 | int error; |
990 | ||
991 | virtblk_wq = alloc_workqueue("virtio-blk", 0, 0); | |
992 | if (!virtblk_wq) | |
993 | return -ENOMEM; | |
994 | ||
4f3bf19c | 995 | major = register_blkdev(0, "virtblk"); |
7a7c924c CH |
996 | if (major < 0) { |
997 | error = major; | |
998 | goto out_destroy_workqueue; | |
999 | } | |
1000 | ||
1001 | error = register_virtio_driver(&virtio_blk); | |
1002 | if (error) | |
1003 | goto out_unregister_blkdev; | |
1004 | return 0; | |
1005 | ||
1006 | out_unregister_blkdev: | |
1007 | unregister_blkdev(major, "virtblk"); | |
1008 | out_destroy_workqueue: | |
1009 | destroy_workqueue(virtblk_wq); | |
1010 | return error; | |
e467cde2 RR |
1011 | } |
1012 | ||
1013 | static void __exit fini(void) | |
1014 | { | |
1015 | unregister_virtio_driver(&virtio_blk); | |
38f37b57 | 1016 | unregister_blkdev(major, "virtblk"); |
7a7c924c | 1017 | destroy_workqueue(virtblk_wq); |
e467cde2 RR |
1018 | } |
1019 | module_init(init); | |
1020 | module_exit(fini); | |
1021 | ||
1022 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1023 | MODULE_DESCRIPTION("Virtio block driver"); | |
1024 | MODULE_LICENSE("GPL"); |