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> |
95bfec41 | 18 | #include <linux/vmalloc.h> |
55a2415b | 19 | #include <uapi/linux/virtio_ring.h> |
3d1266c7 | 20 | |
4f3bf19c | 21 | #define PART_BITS 4 |
6a27b656 | 22 | #define VQ_NAME_LEN 16 |
1f23816b | 23 | #define MAX_DISCARD_SEGMENTS 256u |
e467cde2 | 24 | |
63947b34 SH |
25 | /* The maximum number of sg elements that fit into a virtqueue */ |
26 | #define VIRTIO_BLK_MAX_SG_ELEMS 32768 | |
27 | ||
02746e26 MG |
28 | #ifdef CONFIG_ARCH_NO_SG_CHAIN |
29 | #define VIRTIO_BLK_INLINE_SG_CNT 0 | |
30 | #else | |
31 | #define VIRTIO_BLK_INLINE_SG_CNT 2 | |
32 | #endif | |
33 | ||
0989c41b | 34 | static unsigned int num_request_queues; |
ead65f76 | 35 | module_param(num_request_queues, uint, 0644); |
0989c41b MG |
36 | MODULE_PARM_DESC(num_request_queues, |
37 | "Limit the number of request queues to use for blk device. " | |
38 | "0 for no limit. " | |
39 | "Values > nr_cpu_ids truncated to nr_cpu_ids."); | |
40 | ||
4e040052 SK |
41 | static unsigned int poll_queues; |
42 | module_param(poll_queues, uint, 0644); | |
43 | MODULE_PARM_DESC(poll_queues, "The number of dedicated virtqueues for polling I/O"); | |
44 | ||
5087a50e MT |
45 | static int major; |
46 | static DEFINE_IDA(vd_index_ida); | |
47 | ||
2a647bfe | 48 | static struct workqueue_struct *virtblk_wq; |
4f3bf19c | 49 | |
6a27b656 ML |
50 | struct virtio_blk_vq { |
51 | struct virtqueue *vq; | |
52 | spinlock_t lock; | |
53 | char name[VQ_NAME_LEN]; | |
54 | } ____cacheline_aligned_in_smp; | |
55 | ||
bb6ec576 | 56 | struct virtio_blk { |
90b5feb8 SH |
57 | /* |
58 | * This mutex must be held by anything that may run after | |
59 | * virtblk_remove() sets vblk->vdev to NULL. | |
60 | * | |
61 | * blk-mq, virtqueue processing, and sysfs attribute code paths are | |
62 | * shut down before vblk->vdev is set to NULL and therefore do not need | |
63 | * to hold this mutex. | |
64 | */ | |
65 | struct mutex vdev_mutex; | |
e467cde2 | 66 | struct virtio_device *vdev; |
e467cde2 RR |
67 | |
68 | /* The disk structure for the kernel. */ | |
69 | struct gendisk *disk; | |
70 | ||
24d2f903 CH |
71 | /* Block layer tags. */ |
72 | struct blk_mq_tag_set tag_set; | |
73 | ||
7a7c924c CH |
74 | /* Process context for config space updates */ |
75 | struct work_struct config_work; | |
76 | ||
5087a50e MT |
77 | /* Ida index - used to track minor number allocations. */ |
78 | int index; | |
6a27b656 ML |
79 | |
80 | /* num of vqs */ | |
81 | int num_vqs; | |
4e040052 | 82 | int io_queues[HCTX_MAX_TYPES]; |
6a27b656 | 83 | struct virtio_blk_vq *vqs; |
95bfec41 DF |
84 | |
85 | /* For zoned device */ | |
86 | unsigned int zone_sectors; | |
e467cde2 RR |
87 | }; |
88 | ||
bb6ec576 | 89 | struct virtblk_req { |
95bfec41 | 90 | /* Out header */ |
97b50a65 | 91 | struct virtio_blk_outhdr out_hdr; |
95bfec41 DF |
92 | |
93 | /* In header */ | |
94 | union { | |
95 | u8 status; | |
96 | ||
97 | /* | |
98 | * The zone append command has an extended in header. | |
f1ba4e67 DF |
99 | * The status field in zone_append_in_hdr must always |
100 | * be the last byte. | |
95bfec41 DF |
101 | */ |
102 | struct { | |
f1ba4e67 | 103 | __virtio64 sector; |
95bfec41 | 104 | u8 status; |
f1ba4e67 DF |
105 | } zone_append; |
106 | } in_hdr; | |
95bfec41 DF |
107 | |
108 | size_t in_hdr_len; | |
109 | ||
02746e26 | 110 | struct sg_table sg_table; |
a98755c5 | 111 | struct scatterlist sg[]; |
e467cde2 RR |
112 | }; |
113 | ||
95bfec41 | 114 | static inline blk_status_t virtblk_result(u8 status) |
a98755c5 | 115 | { |
95bfec41 | 116 | switch (status) { |
a98755c5 | 117 | case VIRTIO_BLK_S_OK: |
2a842aca | 118 | return BLK_STS_OK; |
a98755c5 | 119 | case VIRTIO_BLK_S_UNSUPP: |
2a842aca | 120 | return BLK_STS_NOTSUPP; |
95bfec41 DF |
121 | case VIRTIO_BLK_S_ZONE_OPEN_RESOURCE: |
122 | return BLK_STS_ZONE_OPEN_RESOURCE; | |
123 | case VIRTIO_BLK_S_ZONE_ACTIVE_RESOURCE: | |
124 | return BLK_STS_ZONE_ACTIVE_RESOURCE; | |
125 | case VIRTIO_BLK_S_IOERR: | |
126 | case VIRTIO_BLK_S_ZONE_UNALIGNED_WP: | |
a98755c5 | 127 | default: |
2a842aca | 128 | return BLK_STS_IOERR; |
a98755c5 AH |
129 | } |
130 | } | |
131 | ||
8d12ec10 SY |
132 | static inline struct virtio_blk_vq *get_virtio_blk_vq(struct blk_mq_hw_ctx *hctx) |
133 | { | |
134 | struct virtio_blk *vblk = hctx->queue->queuedata; | |
135 | struct virtio_blk_vq *vq = &vblk->vqs[hctx->queue_num]; | |
136 | ||
137 | return vq; | |
138 | } | |
139 | ||
0e9911fa | 140 | static int virtblk_add_req(struct virtqueue *vq, struct virtblk_req *vbr) |
97b50a65 | 141 | { |
95bfec41 | 142 | struct scatterlist out_hdr, in_hdr, *sgs[3]; |
97b50a65 CH |
143 | unsigned int num_out = 0, num_in = 0; |
144 | ||
95bfec41 DF |
145 | sg_init_one(&out_hdr, &vbr->out_hdr, sizeof(vbr->out_hdr)); |
146 | sgs[num_out++] = &out_hdr; | |
20af3cfd | 147 | |
0e9911fa | 148 | if (vbr->sg_table.nents) { |
19c1c5a6 | 149 | if (vbr->out_hdr.type & cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_OUT)) |
0e9911fa | 150 | sgs[num_out++] = vbr->sg_table.sgl; |
8f39db9d | 151 | else |
0e9911fa | 152 | sgs[num_out + num_in++] = vbr->sg_table.sgl; |
20af3cfd PB |
153 | } |
154 | ||
f1ba4e67 | 155 | sg_init_one(&in_hdr, &vbr->in_hdr.status, vbr->in_hdr_len); |
95bfec41 | 156 | sgs[num_out + num_in++] = &in_hdr; |
8f39db9d PB |
157 | |
158 | return virtqueue_add_sgs(vq, sgs, num_out, num_in, vbr, GFP_ATOMIC); | |
5ee21a52 PB |
159 | } |
160 | ||
e60d6407 | 161 | static int virtblk_setup_discard_write_zeroes_erase(struct request *req, bool unmap) |
1f23816b CL |
162 | { |
163 | unsigned short segments = blk_rq_nr_discard_segments(req); | |
164 | unsigned short n = 0; | |
165 | struct virtio_blk_discard_write_zeroes *range; | |
166 | struct bio *bio; | |
167 | u32 flags = 0; | |
168 | ||
169 | if (unmap) | |
170 | flags |= VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP; | |
171 | ||
172 | range = kmalloc_array(segments, sizeof(*range), GFP_ATOMIC); | |
173 | if (!range) | |
174 | return -ENOMEM; | |
175 | ||
af822aa6 ML |
176 | /* |
177 | * Single max discard segment means multi-range discard isn't | |
178 | * supported, and block layer only runs contiguity merge like | |
179 | * normal RW request. So we can't reply on bio for retrieving | |
180 | * each range info. | |
181 | */ | |
182 | if (queue_max_discard_segments(req->q) == 1) { | |
183 | range[0].flags = cpu_to_le32(flags); | |
184 | range[0].num_sectors = cpu_to_le32(blk_rq_sectors(req)); | |
185 | range[0].sector = cpu_to_le64(blk_rq_pos(req)); | |
186 | n = 1; | |
187 | } else { | |
188 | __rq_for_each_bio(bio, req) { | |
189 | u64 sector = bio->bi_iter.bi_sector; | |
190 | u32 num_sectors = bio->bi_iter.bi_size >> SECTOR_SHIFT; | |
191 | ||
192 | range[n].flags = cpu_to_le32(flags); | |
193 | range[n].num_sectors = cpu_to_le32(num_sectors); | |
194 | range[n].sector = cpu_to_le64(sector); | |
195 | n++; | |
196 | } | |
1f23816b CL |
197 | } |
198 | ||
af822aa6 ML |
199 | WARN_ON_ONCE(n != segments); |
200 | ||
b831f3a1 | 201 | bvec_set_virt(&req->special_vec, range, sizeof(*range) * segments); |
1f23816b CL |
202 | req->rq_flags |= RQF_SPECIAL_PAYLOAD; |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
02746e26 | 207 | static void virtblk_unmap_data(struct request *req, struct virtblk_req *vbr) |
a98755c5 | 208 | { |
02746e26 MG |
209 | if (blk_rq_nr_phys_segments(req)) |
210 | sg_free_table_chained(&vbr->sg_table, | |
211 | VIRTIO_BLK_INLINE_SG_CNT); | |
212 | } | |
213 | ||
214 | static int virtblk_map_data(struct blk_mq_hw_ctx *hctx, struct request *req, | |
215 | struct virtblk_req *vbr) | |
216 | { | |
217 | int err; | |
218 | ||
219 | if (!blk_rq_nr_phys_segments(req)) | |
220 | return 0; | |
a98755c5 | 221 | |
02746e26 MG |
222 | vbr->sg_table.sgl = vbr->sg; |
223 | err = sg_alloc_table_chained(&vbr->sg_table, | |
224 | blk_rq_nr_phys_segments(req), | |
225 | vbr->sg_table.sgl, | |
226 | VIRTIO_BLK_INLINE_SG_CNT); | |
227 | if (unlikely(err)) | |
228 | return -ENOMEM; | |
a98755c5 | 229 | |
02746e26 MG |
230 | return blk_rq_map_sg(hctx->queue, req, vbr->sg_table.sgl); |
231 | } | |
232 | ||
233 | static void virtblk_cleanup_cmd(struct request *req) | |
234 | { | |
358b348b CH |
235 | if (req->rq_flags & RQF_SPECIAL_PAYLOAD) |
236 | kfree(bvec_virt(&req->special_vec)); | |
02746e26 MG |
237 | } |
238 | ||
f0839372 MT |
239 | static blk_status_t virtblk_setup_cmd(struct virtio_device *vdev, |
240 | struct request *req, | |
241 | struct virtblk_req *vbr) | |
02746e26 | 242 | { |
f1ba4e67 | 243 | size_t in_hdr_len = sizeof(vbr->in_hdr.status); |
02746e26 MG |
244 | bool unmap = false; |
245 | u32 type; | |
95bfec41 | 246 | u64 sector = 0; |
02746e26 | 247 | |
f1ba4e67 DF |
248 | if (!IS_ENABLED(CONFIG_BLK_DEV_ZONED) && op_is_zone_mgmt(req_op(req))) |
249 | return BLK_STS_NOTSUPP; | |
250 | ||
95bfec41 DF |
251 | /* Set fields for all request types */ |
252 | vbr->out_hdr.ioprio = cpu_to_virtio32(vdev, req_get_ioprio(req)); | |
02746e26 MG |
253 | |
254 | switch (req_op(req)) { | |
255 | case REQ_OP_READ: | |
256 | type = VIRTIO_BLK_T_IN; | |
95bfec41 | 257 | sector = blk_rq_pos(req); |
02746e26 MG |
258 | break; |
259 | case REQ_OP_WRITE: | |
260 | type = VIRTIO_BLK_T_OUT; | |
95bfec41 | 261 | sector = blk_rq_pos(req); |
02746e26 MG |
262 | break; |
263 | case REQ_OP_FLUSH: | |
264 | type = VIRTIO_BLK_T_FLUSH; | |
265 | break; | |
266 | case REQ_OP_DISCARD: | |
267 | type = VIRTIO_BLK_T_DISCARD; | |
268 | break; | |
269 | case REQ_OP_WRITE_ZEROES: | |
270 | type = VIRTIO_BLK_T_WRITE_ZEROES; | |
271 | unmap = !(req->cmd_flags & REQ_NOUNMAP); | |
272 | break; | |
e60d6407 AK |
273 | case REQ_OP_SECURE_ERASE: |
274 | type = VIRTIO_BLK_T_SECURE_ERASE; | |
275 | break; | |
95bfec41 DF |
276 | case REQ_OP_ZONE_OPEN: |
277 | type = VIRTIO_BLK_T_ZONE_OPEN; | |
278 | sector = blk_rq_pos(req); | |
279 | break; | |
280 | case REQ_OP_ZONE_CLOSE: | |
281 | type = VIRTIO_BLK_T_ZONE_CLOSE; | |
282 | sector = blk_rq_pos(req); | |
283 | break; | |
284 | case REQ_OP_ZONE_FINISH: | |
285 | type = VIRTIO_BLK_T_ZONE_FINISH; | |
286 | sector = blk_rq_pos(req); | |
02746e26 | 287 | break; |
95bfec41 DF |
288 | case REQ_OP_ZONE_APPEND: |
289 | type = VIRTIO_BLK_T_ZONE_APPEND; | |
290 | sector = blk_rq_pos(req); | |
f1ba4e67 | 291 | in_hdr_len = sizeof(vbr->in_hdr.zone_append); |
02746e26 | 292 | break; |
95bfec41 DF |
293 | case REQ_OP_ZONE_RESET: |
294 | type = VIRTIO_BLK_T_ZONE_RESET; | |
295 | sector = blk_rq_pos(req); | |
296 | break; | |
297 | case REQ_OP_ZONE_RESET_ALL: | |
298 | type = VIRTIO_BLK_T_ZONE_RESET_ALL; | |
299 | break; | |
300 | case REQ_OP_DRV_IN: | |
f1ba4e67 DF |
301 | /* |
302 | * Out header has already been prepared by the caller (virtblk_get_id() | |
303 | * or virtblk_submit_zone_report()), nothing to do here. | |
304 | */ | |
95bfec41 | 305 | return 0; |
02746e26 MG |
306 | default: |
307 | WARN_ON_ONCE(1); | |
308 | return BLK_STS_IOERR; | |
309 | } | |
310 | ||
95bfec41 DF |
311 | /* Set fields for non-REQ_OP_DRV_IN request types */ |
312 | vbr->in_hdr_len = in_hdr_len; | |
02746e26 | 313 | vbr->out_hdr.type = cpu_to_virtio32(vdev, type); |
95bfec41 | 314 | vbr->out_hdr.sector = cpu_to_virtio64(vdev, sector); |
02746e26 | 315 | |
e60d6407 AK |
316 | if (type == VIRTIO_BLK_T_DISCARD || type == VIRTIO_BLK_T_WRITE_ZEROES || |
317 | type == VIRTIO_BLK_T_SECURE_ERASE) { | |
318 | if (virtblk_setup_discard_write_zeroes_erase(req, unmap)) | |
02746e26 MG |
319 | return BLK_STS_RESOURCE; |
320 | } | |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
f1ba4e67 DF |
325 | /* |
326 | * The status byte is always the last byte of the virtblk request | |
327 | * in-header. This helper fetches its value for all in-header formats | |
328 | * that are currently defined. | |
329 | */ | |
330 | static inline u8 virtblk_vbr_status(struct virtblk_req *vbr) | |
331 | { | |
332 | return *((u8 *)&vbr->in_hdr + vbr->in_hdr_len - 1); | |
333 | } | |
334 | ||
02746e26 MG |
335 | static inline void virtblk_request_done(struct request *req) |
336 | { | |
337 | struct virtblk_req *vbr = blk_mq_rq_to_pdu(req); | |
f1ba4e67 DF |
338 | blk_status_t status = virtblk_result(virtblk_vbr_status(vbr)); |
339 | struct virtio_blk *vblk = req->mq_hctx->queue->queuedata; | |
02746e26 MG |
340 | |
341 | virtblk_unmap_data(req, vbr); | |
342 | virtblk_cleanup_cmd(req); | |
95bfec41 DF |
343 | |
344 | if (req_op(req) == REQ_OP_ZONE_APPEND) | |
f1ba4e67 DF |
345 | req->__sector = virtio64_to_cpu(vblk->vdev, |
346 | vbr->in_hdr.zone_append.sector); | |
95bfec41 DF |
347 | |
348 | blk_mq_end_request(req, status); | |
a98755c5 AH |
349 | } |
350 | ||
351 | static void virtblk_done(struct virtqueue *vq) | |
e467cde2 RR |
352 | { |
353 | struct virtio_blk *vblk = vq->vdev->priv; | |
afd384f0 MT |
354 | bool req_done = false; |
355 | int qid = vq->index; | |
356 | struct virtblk_req *vbr; | |
e467cde2 | 357 | unsigned long flags; |
afd384f0 | 358 | unsigned int len; |
e467cde2 | 359 | |
afd384f0 | 360 | spin_lock_irqsave(&vblk->vqs[qid].lock, flags); |
bb811108 AH |
361 | do { |
362 | virtqueue_disable_cb(vq); | |
afd384f0 MT |
363 | while ((vbr = virtqueue_get_buf(vblk->vqs[qid].vq, &len)) != NULL) { |
364 | struct request *req = blk_mq_rq_from_pdu(vbr); | |
85dada09 | 365 | |
afd384f0 MT |
366 | if (likely(!blk_should_fake_timeout(req->q))) |
367 | blk_mq_complete_request(req); | |
368 | req_done = true; | |
369 | } | |
bb811108 | 370 | } while (!virtqueue_enable_cb(vq)); |
1cf7e9c6 | 371 | |
afd384f0 MT |
372 | /* In case queue is stopped waiting for more buffers. */ |
373 | if (req_done) | |
1b4a3258 | 374 | blk_mq_start_stopped_hw_queues(vblk->disk->queue, true); |
afd384f0 | 375 | spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags); |
a98755c5 AH |
376 | } |
377 | ||
944e7c87 JA |
378 | static void virtio_commit_rqs(struct blk_mq_hw_ctx *hctx) |
379 | { | |
380 | struct virtio_blk *vblk = hctx->queue->queuedata; | |
381 | struct virtio_blk_vq *vq = &vblk->vqs[hctx->queue_num]; | |
382 | bool kick; | |
383 | ||
384 | spin_lock_irq(&vq->lock); | |
385 | kick = virtqueue_kick_prepare(vq->vq); | |
386 | spin_unlock_irq(&vq->lock); | |
387 | ||
388 | if (kick) | |
389 | virtqueue_notify(vq->vq); | |
390 | } | |
391 | ||
258896fc DF |
392 | static blk_status_t virtblk_fail_to_queue(struct request *req, int rc) |
393 | { | |
394 | virtblk_cleanup_cmd(req); | |
395 | switch (rc) { | |
396 | case -ENOSPC: | |
397 | return BLK_STS_DEV_RESOURCE; | |
398 | case -ENOMEM: | |
399 | return BLK_STS_RESOURCE; | |
400 | default: | |
401 | return BLK_STS_IOERR; | |
402 | } | |
403 | } | |
404 | ||
0e9911fa SK |
405 | static blk_status_t virtblk_prep_rq(struct blk_mq_hw_ctx *hctx, |
406 | struct virtio_blk *vblk, | |
407 | struct request *req, | |
408 | struct virtblk_req *vbr) | |
409 | { | |
410 | blk_status_t status; | |
a26116c1 | 411 | int num; |
0e9911fa SK |
412 | |
413 | status = virtblk_setup_cmd(vblk->vdev, req, vbr); | |
414 | if (unlikely(status)) | |
415 | return status; | |
416 | ||
a26116c1 RM |
417 | num = virtblk_map_data(hctx, req, vbr); |
418 | if (unlikely(num < 0)) | |
258896fc | 419 | return virtblk_fail_to_queue(req, -ENOMEM); |
a26116c1 | 420 | vbr->sg_table.nents = num; |
0e9911fa | 421 | |
37fafe6b SK |
422 | blk_mq_start_request(req); |
423 | ||
0e9911fa SK |
424 | return BLK_STS_OK; |
425 | } | |
426 | ||
fc17b653 | 427 | static blk_status_t virtio_queue_rq(struct blk_mq_hw_ctx *hctx, |
74c45052 | 428 | const struct blk_mq_queue_data *bd) |
e467cde2 | 429 | { |
1cf7e9c6 | 430 | struct virtio_blk *vblk = hctx->queue->queuedata; |
74c45052 | 431 | struct request *req = bd->rq; |
9d74e257 | 432 | struct virtblk_req *vbr = blk_mq_rq_to_pdu(req); |
1cf7e9c6 | 433 | unsigned long flags; |
6a27b656 | 434 | int qid = hctx->queue_num; |
e8edca6f | 435 | bool notify = false; |
f0839372 MT |
436 | blk_status_t status; |
437 | int err; | |
e467cde2 | 438 | |
0e9911fa | 439 | status = virtblk_prep_rq(hctx, vblk, req, vbr); |
f0839372 MT |
440 | if (unlikely(status)) |
441 | return status; | |
aebf526b | 442 | |
6a27b656 | 443 | spin_lock_irqsave(&vblk->vqs[qid].lock, flags); |
0e9911fa | 444 | err = virtblk_add_req(vblk->vqs[qid].vq, vbr); |
5261b85e | 445 | if (err) { |
6a27b656 | 446 | virtqueue_kick(vblk->vqs[qid].vq); |
f5f6b95c HP |
447 | /* Don't stop the queue if -ENOMEM: we may have failed to |
448 | * bounce the buffer due to global resource outage. | |
449 | */ | |
450 | if (err == -ENOSPC) | |
451 | blk_mq_stop_hw_queue(hctx); | |
6a27b656 | 452 | spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags); |
02746e26 | 453 | virtblk_unmap_data(req, vbr); |
258896fc | 454 | return virtblk_fail_to_queue(req, err); |
a98755c5 AH |
455 | } |
456 | ||
74c45052 | 457 | if (bd->last && virtqueue_kick_prepare(vblk->vqs[qid].vq)) |
e8edca6f | 458 | notify = true; |
6a27b656 | 459 | spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags); |
e8edca6f ML |
460 | |
461 | if (notify) | |
6a27b656 | 462 | virtqueue_notify(vblk->vqs[qid].vq); |
fc17b653 | 463 | return BLK_STS_OK; |
a98755c5 AH |
464 | } |
465 | ||
0e9911fa SK |
466 | static bool virtblk_prep_rq_batch(struct request *req) |
467 | { | |
468 | struct virtio_blk *vblk = req->mq_hctx->queue->queuedata; | |
469 | struct virtblk_req *vbr = blk_mq_rq_to_pdu(req); | |
470 | ||
0e9911fa SK |
471 | return virtblk_prep_rq(req->mq_hctx, vblk, req, vbr) == BLK_STS_OK; |
472 | } | |
473 | ||
474 | static bool virtblk_add_req_batch(struct virtio_blk_vq *vq, | |
37fafe6b | 475 | struct request **rqlist) |
0e9911fa SK |
476 | { |
477 | unsigned long flags; | |
478 | int err; | |
479 | bool kick; | |
480 | ||
481 | spin_lock_irqsave(&vq->lock, flags); | |
482 | ||
483 | while (!rq_list_empty(*rqlist)) { | |
484 | struct request *req = rq_list_pop(rqlist); | |
485 | struct virtblk_req *vbr = blk_mq_rq_to_pdu(req); | |
486 | ||
487 | err = virtblk_add_req(vq->vq, vbr); | |
488 | if (err) { | |
489 | virtblk_unmap_data(req, vbr); | |
490 | virtblk_cleanup_cmd(req); | |
37fafe6b | 491 | blk_mq_requeue_request(req, true); |
0e9911fa SK |
492 | } |
493 | } | |
494 | ||
495 | kick = virtqueue_kick_prepare(vq->vq); | |
496 | spin_unlock_irqrestore(&vq->lock, flags); | |
497 | ||
498 | return kick; | |
499 | } | |
500 | ||
501 | static void virtio_queue_rqs(struct request **rqlist) | |
502 | { | |
503 | struct request *req, *next, *prev = NULL; | |
504 | struct request *requeue_list = NULL; | |
505 | ||
506 | rq_list_for_each_safe(rqlist, req, next) { | |
8d12ec10 | 507 | struct virtio_blk_vq *vq = get_virtio_blk_vq(req->mq_hctx); |
0e9911fa SK |
508 | bool kick; |
509 | ||
510 | if (!virtblk_prep_rq_batch(req)) { | |
511 | rq_list_move(rqlist, &requeue_list, req, prev); | |
512 | req = prev; | |
513 | if (!req) | |
514 | continue; | |
515 | } | |
516 | ||
517 | if (!next || req->mq_hctx != next->mq_hctx) { | |
518 | req->rq_next = NULL; | |
37fafe6b | 519 | kick = virtblk_add_req_batch(vq, rqlist); |
0e9911fa SK |
520 | if (kick) |
521 | virtqueue_notify(vq->vq); | |
522 | ||
523 | *rqlist = next; | |
524 | prev = NULL; | |
525 | } else | |
526 | prev = req; | |
527 | } | |
528 | ||
529 | *rqlist = requeue_list; | |
530 | } | |
531 | ||
95bfec41 DF |
532 | #ifdef CONFIG_BLK_DEV_ZONED |
533 | static void *virtblk_alloc_report_buffer(struct virtio_blk *vblk, | |
534 | unsigned int nr_zones, | |
95bfec41 DF |
535 | size_t *buflen) |
536 | { | |
537 | struct request_queue *q = vblk->disk->queue; | |
538 | size_t bufsize; | |
539 | void *buf; | |
540 | ||
541 | nr_zones = min_t(unsigned int, nr_zones, | |
f1ba4e67 | 542 | get_capacity(vblk->disk) >> ilog2(vblk->zone_sectors)); |
95bfec41 DF |
543 | |
544 | bufsize = sizeof(struct virtio_blk_zone_report) + | |
545 | nr_zones * sizeof(struct virtio_blk_zone_descriptor); | |
546 | bufsize = min_t(size_t, bufsize, | |
547 | queue_max_hw_sectors(q) << SECTOR_SHIFT); | |
548 | bufsize = min_t(size_t, bufsize, queue_max_segments(q) << PAGE_SHIFT); | |
549 | ||
550 | while (bufsize >= sizeof(struct virtio_blk_zone_report)) { | |
551 | buf = __vmalloc(bufsize, GFP_KERNEL | __GFP_NORETRY); | |
552 | if (buf) { | |
553 | *buflen = bufsize; | |
554 | return buf; | |
555 | } | |
556 | bufsize >>= 1; | |
557 | } | |
558 | ||
559 | return NULL; | |
560 | } | |
561 | ||
562 | static int virtblk_submit_zone_report(struct virtio_blk *vblk, | |
563 | char *report_buf, size_t report_len, | |
564 | sector_t sector) | |
565 | { | |
566 | struct request_queue *q = vblk->disk->queue; | |
567 | struct request *req; | |
568 | struct virtblk_req *vbr; | |
569 | int err; | |
570 | ||
571 | req = blk_mq_alloc_request(q, REQ_OP_DRV_IN, 0); | |
572 | if (IS_ERR(req)) | |
573 | return PTR_ERR(req); | |
574 | ||
575 | vbr = blk_mq_rq_to_pdu(req); | |
f1ba4e67 | 576 | vbr->in_hdr_len = sizeof(vbr->in_hdr.status); |
95bfec41 DF |
577 | vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_ZONE_REPORT); |
578 | vbr->out_hdr.sector = cpu_to_virtio64(vblk->vdev, sector); | |
579 | ||
580 | err = blk_rq_map_kern(q, req, report_buf, report_len, GFP_KERNEL); | |
581 | if (err) | |
582 | goto out; | |
583 | ||
584 | blk_execute_rq(req, false); | |
f1ba4e67 | 585 | err = blk_status_to_errno(virtblk_result(vbr->in_hdr.status)); |
95bfec41 DF |
586 | out: |
587 | blk_mq_free_request(req); | |
588 | return err; | |
589 | } | |
590 | ||
591 | static int virtblk_parse_zone(struct virtio_blk *vblk, | |
592 | struct virtio_blk_zone_descriptor *entry, | |
f1ba4e67 | 593 | unsigned int idx, report_zones_cb cb, void *data) |
95bfec41 DF |
594 | { |
595 | struct blk_zone zone = { }; | |
596 | ||
f1ba4e67 DF |
597 | zone.start = virtio64_to_cpu(vblk->vdev, entry->z_start); |
598 | if (zone.start + vblk->zone_sectors <= get_capacity(vblk->disk)) | |
599 | zone.len = vblk->zone_sectors; | |
600 | else | |
601 | zone.len = get_capacity(vblk->disk) - zone.start; | |
602 | zone.capacity = virtio64_to_cpu(vblk->vdev, entry->z_cap); | |
603 | zone.wp = virtio64_to_cpu(vblk->vdev, entry->z_wp); | |
604 | ||
605 | switch (entry->z_type) { | |
606 | case VIRTIO_BLK_ZT_SWR: | |
607 | zone.type = BLK_ZONE_TYPE_SEQWRITE_REQ; | |
608 | break; | |
609 | case VIRTIO_BLK_ZT_SWP: | |
610 | zone.type = BLK_ZONE_TYPE_SEQWRITE_PREF; | |
611 | break; | |
612 | case VIRTIO_BLK_ZT_CONV: | |
613 | zone.type = BLK_ZONE_TYPE_CONVENTIONAL; | |
614 | break; | |
615 | default: | |
616 | dev_err(&vblk->vdev->dev, "zone %llu: invalid type %#x\n", | |
617 | zone.start, entry->z_type); | |
618 | return -EIO; | |
95bfec41 DF |
619 | } |
620 | ||
f1ba4e67 DF |
621 | switch (entry->z_state) { |
622 | case VIRTIO_BLK_ZS_EMPTY: | |
623 | zone.cond = BLK_ZONE_COND_EMPTY; | |
624 | break; | |
625 | case VIRTIO_BLK_ZS_CLOSED: | |
626 | zone.cond = BLK_ZONE_COND_CLOSED; | |
627 | break; | |
628 | case VIRTIO_BLK_ZS_FULL: | |
629 | zone.cond = BLK_ZONE_COND_FULL; | |
95bfec41 | 630 | zone.wp = zone.start + zone.len; |
f1ba4e67 DF |
631 | break; |
632 | case VIRTIO_BLK_ZS_EOPEN: | |
633 | zone.cond = BLK_ZONE_COND_EXP_OPEN; | |
634 | break; | |
635 | case VIRTIO_BLK_ZS_IOPEN: | |
636 | zone.cond = BLK_ZONE_COND_IMP_OPEN; | |
637 | break; | |
638 | case VIRTIO_BLK_ZS_NOT_WP: | |
639 | zone.cond = BLK_ZONE_COND_NOT_WP; | |
640 | break; | |
641 | case VIRTIO_BLK_ZS_RDONLY: | |
642 | zone.cond = BLK_ZONE_COND_READONLY; | |
643 | zone.wp = ULONG_MAX; | |
644 | break; | |
645 | case VIRTIO_BLK_ZS_OFFLINE: | |
646 | zone.cond = BLK_ZONE_COND_OFFLINE; | |
647 | zone.wp = ULONG_MAX; | |
648 | break; | |
649 | default: | |
650 | dev_err(&vblk->vdev->dev, "zone %llu: invalid condition %#x\n", | |
651 | zone.start, entry->z_state); | |
652 | return -EIO; | |
653 | } | |
95bfec41 | 654 | |
f1ba4e67 DF |
655 | /* |
656 | * The callback below checks the validity of the reported | |
657 | * entry data, no need to further validate it here. | |
658 | */ | |
95bfec41 DF |
659 | return cb(&zone, idx, data); |
660 | } | |
661 | ||
662 | static int virtblk_report_zones(struct gendisk *disk, sector_t sector, | |
663 | unsigned int nr_zones, report_zones_cb cb, | |
664 | void *data) | |
665 | { | |
666 | struct virtio_blk *vblk = disk->private_data; | |
667 | struct virtio_blk_zone_report *report; | |
f1ba4e67 | 668 | unsigned long long nz, i; |
95bfec41 | 669 | size_t buflen; |
f1ba4e67 DF |
670 | unsigned int zone_idx = 0; |
671 | int ret; | |
95bfec41 DF |
672 | |
673 | if (WARN_ON_ONCE(!vblk->zone_sectors)) | |
674 | return -EOPNOTSUPP; | |
675 | ||
f1ba4e67 | 676 | report = virtblk_alloc_report_buffer(vblk, nr_zones, &buflen); |
95bfec41 DF |
677 | if (!report) |
678 | return -ENOMEM; | |
679 | ||
f1ba4e67 DF |
680 | mutex_lock(&vblk->vdev_mutex); |
681 | ||
682 | if (!vblk->vdev) { | |
683 | ret = -ENXIO; | |
684 | goto fail_report; | |
685 | } | |
686 | ||
95bfec41 DF |
687 | while (zone_idx < nr_zones && sector < get_capacity(vblk->disk)) { |
688 | memset(report, 0, buflen); | |
689 | ||
690 | ret = virtblk_submit_zone_report(vblk, (char *)report, | |
691 | buflen, sector); | |
f1ba4e67 DF |
692 | if (ret) |
693 | goto fail_report; | |
694 | ||
695 | nz = min_t(u64, virtio64_to_cpu(vblk->vdev, report->nr_zones), | |
696 | nr_zones); | |
95bfec41 DF |
697 | if (!nz) |
698 | break; | |
699 | ||
700 | for (i = 0; i < nz && zone_idx < nr_zones; i++) { | |
701 | ret = virtblk_parse_zone(vblk, &report->zones[i], | |
f1ba4e67 | 702 | zone_idx, cb, data); |
95bfec41 | 703 | if (ret) |
f1ba4e67 DF |
704 | goto fail_report; |
705 | ||
706 | sector = virtio64_to_cpu(vblk->vdev, | |
707 | report->zones[i].z_start) + | |
708 | vblk->zone_sectors; | |
95bfec41 DF |
709 | zone_idx++; |
710 | } | |
711 | } | |
712 | ||
713 | if (zone_idx > 0) | |
714 | ret = zone_idx; | |
715 | else | |
716 | ret = -EINVAL; | |
f1ba4e67 DF |
717 | fail_report: |
718 | mutex_unlock(&vblk->vdev_mutex); | |
95bfec41 DF |
719 | kvfree(report); |
720 | return ret; | |
721 | } | |
722 | ||
8b837256 CH |
723 | static int virtblk_read_zoned_limits(struct virtio_blk *vblk, |
724 | struct queue_limits *lim) | |
95bfec41 | 725 | { |
8b837256 | 726 | struct virtio_device *vdev = vblk->vdev; |
f1ba4e67 | 727 | u32 v, wg; |
95bfec41 DF |
728 | |
729 | dev_dbg(&vdev->dev, "probing host-managed zoned device\n"); | |
730 | ||
8b837256 | 731 | lim->zoned = true; |
95bfec41 DF |
732 | |
733 | virtio_cread(vdev, struct virtio_blk_config, | |
734 | zoned.max_open_zones, &v); | |
0e46064e | 735 | lim->max_open_zones = v; |
f1ba4e67 | 736 | dev_dbg(&vdev->dev, "max open zones = %u\n", v); |
95bfec41 DF |
737 | |
738 | virtio_cread(vdev, struct virtio_blk_config, | |
739 | zoned.max_active_zones, &v); | |
0e46064e | 740 | lim->max_active_zones = v; |
f1ba4e67 | 741 | dev_dbg(&vdev->dev, "max active zones = %u\n", v); |
95bfec41 DF |
742 | |
743 | virtio_cread(vdev, struct virtio_blk_config, | |
f1ba4e67 DF |
744 | zoned.write_granularity, &wg); |
745 | if (!wg) { | |
95bfec41 DF |
746 | dev_warn(&vdev->dev, "zero write granularity reported\n"); |
747 | return -ENODEV; | |
748 | } | |
8b837256 CH |
749 | lim->physical_block_size = wg; |
750 | lim->io_min = wg; | |
95bfec41 | 751 | |
f1ba4e67 | 752 | dev_dbg(&vdev->dev, "write granularity = %u\n", wg); |
95bfec41 DF |
753 | |
754 | /* | |
755 | * virtio ZBD specification doesn't require zones to be a power of | |
756 | * two sectors in size, but the code in this driver expects that. | |
757 | */ | |
f1ba4e67 DF |
758 | virtio_cread(vdev, struct virtio_blk_config, zoned.zone_sectors, |
759 | &vblk->zone_sectors); | |
95bfec41 DF |
760 | if (vblk->zone_sectors == 0 || !is_power_of_2(vblk->zone_sectors)) { |
761 | dev_err(&vdev->dev, | |
762 | "zoned device with non power of two zone size %u\n", | |
763 | vblk->zone_sectors); | |
764 | return -ENODEV; | |
765 | } | |
8b837256 | 766 | lim->chunk_sectors = vblk->zone_sectors; |
95bfec41 DF |
767 | dev_dbg(&vdev->dev, "zone sectors = %u\n", vblk->zone_sectors); |
768 | ||
769 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_DISCARD)) { | |
770 | dev_warn(&vblk->vdev->dev, | |
771 | "ignoring negotiated F_DISCARD for zoned device\n"); | |
8b837256 | 772 | lim->max_hw_discard_sectors = 0; |
95bfec41 DF |
773 | } |
774 | ||
a3d96ed2 DLM |
775 | virtio_cread(vdev, struct virtio_blk_config, |
776 | zoned.max_append_sectors, &v); | |
777 | if (!v) { | |
778 | dev_warn(&vdev->dev, "zero max_append_sectors reported\n"); | |
779 | return -ENODEV; | |
95bfec41 | 780 | } |
a3d96ed2 DLM |
781 | if ((v << SECTOR_SHIFT) < wg) { |
782 | dev_err(&vdev->dev, | |
783 | "write granularity %u exceeds max_append_sectors %u limit\n", | |
784 | wg, v); | |
785 | return -ENODEV; | |
786 | } | |
8b837256 | 787 | lim->max_zone_append_sectors = v; |
a3d96ed2 | 788 | dev_dbg(&vdev->dev, "max append sectors = %u\n", v); |
95bfec41 | 789 | |
8b837256 | 790 | return 0; |
95bfec41 | 791 | } |
95bfec41 | 792 | #else |
95bfec41 | 793 | /* |
8b837256 CH |
794 | * Zoned block device support is not configured in this kernel, host-managed |
795 | * zoned devices can't be supported. | |
95bfec41 DF |
796 | */ |
797 | #define virtblk_report_zones NULL | |
8b837256 CH |
798 | static inline int virtblk_read_zoned_limits(struct virtio_blk *vblk, |
799 | struct queue_limits *lim) | |
95bfec41 | 800 | { |
8b837256 | 801 | dev_err(&vblk->vdev->dev, |
77360cad CH |
802 | "virtio_blk: zoned devices are not supported"); |
803 | return -EOPNOTSUPP; | |
95bfec41 DF |
804 | } |
805 | #endif /* CONFIG_BLK_DEV_ZONED */ | |
806 | ||
4cb2ea28 | 807 | /* return id (s/n) string for *disk to *id_str |
808 | */ | |
809 | static int virtblk_get_id(struct gendisk *disk, char *id_str) | |
810 | { | |
811 | struct virtio_blk *vblk = disk->private_data; | |
f9596695 | 812 | struct request_queue *q = vblk->disk->queue; |
4cb2ea28 | 813 | struct request *req; |
95bfec41 | 814 | struct virtblk_req *vbr; |
e4c4776d | 815 | int err; |
4cb2ea28 | 816 | |
0bf6d96c | 817 | req = blk_mq_alloc_request(q, REQ_OP_DRV_IN, 0); |
f9596695 | 818 | if (IS_ERR(req)) |
4cb2ea28 | 819 | return PTR_ERR(req); |
f9596695 | 820 | |
95bfec41 | 821 | vbr = blk_mq_rq_to_pdu(req); |
f1ba4e67 | 822 | vbr->in_hdr_len = sizeof(vbr->in_hdr.status); |
95bfec41 DF |
823 | vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_GET_ID); |
824 | vbr->out_hdr.sector = 0; | |
825 | ||
f9596695 CH |
826 | err = blk_rq_map_kern(q, req, id_str, VIRTIO_BLK_ID_BYTES, GFP_KERNEL); |
827 | if (err) | |
828 | goto out; | |
829 | ||
b84ba30b | 830 | blk_execute_rq(req, false); |
f1ba4e67 | 831 | err = blk_status_to_errno(virtblk_result(vbr->in_hdr.status)); |
f9596695 | 832 | out: |
0bf6d96c | 833 | blk_mq_free_request(req); |
e4c4776d | 834 | return err; |
4cb2ea28 | 835 | } |
836 | ||
135da0b0 CB |
837 | /* We provide getgeo only to please some old bootloader/partitioning tools */ |
838 | static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo) | |
839 | { | |
48e4043d | 840 | struct virtio_blk *vblk = bd->bd_disk->private_data; |
90b5feb8 SH |
841 | int ret = 0; |
842 | ||
843 | mutex_lock(&vblk->vdev_mutex); | |
844 | ||
845 | if (!vblk->vdev) { | |
846 | ret = -ENXIO; | |
847 | goto out; | |
848 | } | |
48e4043d RH |
849 | |
850 | /* see if the host passed in geometry config */ | |
855e0c52 RR |
851 | if (virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_GEOMETRY)) { |
852 | virtio_cread(vblk->vdev, struct virtio_blk_config, | |
853 | geometry.cylinders, &geo->cylinders); | |
854 | virtio_cread(vblk->vdev, struct virtio_blk_config, | |
855 | geometry.heads, &geo->heads); | |
856 | virtio_cread(vblk->vdev, struct virtio_blk_config, | |
857 | geometry.sectors, &geo->sectors); | |
48e4043d RH |
858 | } else { |
859 | /* some standard values, similar to sd */ | |
860 | geo->heads = 1 << 6; | |
861 | geo->sectors = 1 << 5; | |
862 | geo->cylinders = get_capacity(bd->bd_disk) >> 11; | |
863 | } | |
90b5feb8 SH |
864 | out: |
865 | mutex_unlock(&vblk->vdev_mutex); | |
866 | return ret; | |
135da0b0 CB |
867 | } |
868 | ||
24b45e6c CH |
869 | static void virtblk_free_disk(struct gendisk *disk) |
870 | { | |
871 | struct virtio_blk *vblk = disk->private_data; | |
872 | ||
92a34c46 | 873 | ida_free(&vd_index_ida, vblk->index); |
24b45e6c CH |
874 | mutex_destroy(&vblk->vdev_mutex); |
875 | kfree(vblk); | |
876 | } | |
877 | ||
83d5cde4 | 878 | static const struct block_device_operations virtblk_fops = { |
24b45e6c CH |
879 | .owner = THIS_MODULE, |
880 | .getgeo = virtblk_getgeo, | |
881 | .free_disk = virtblk_free_disk, | |
95bfec41 | 882 | .report_zones = virtblk_report_zones, |
e467cde2 RR |
883 | }; |
884 | ||
d50ed907 CB |
885 | static int index_to_minor(int index) |
886 | { | |
887 | return index << PART_BITS; | |
888 | } | |
889 | ||
5087a50e MT |
890 | static int minor_to_index(int minor) |
891 | { | |
892 | return minor >> PART_BITS; | |
893 | } | |
894 | ||
e982c4d0 HR |
895 | static ssize_t serial_show(struct device *dev, |
896 | struct device_attribute *attr, char *buf) | |
a5eb9e4f RH |
897 | { |
898 | struct gendisk *disk = dev_to_disk(dev); | |
899 | int err; | |
900 | ||
901 | /* sysfs gives us a PAGE_SIZE buffer */ | |
902 | BUILD_BUG_ON(PAGE_SIZE < VIRTIO_BLK_ID_BYTES); | |
903 | ||
904 | buf[VIRTIO_BLK_ID_BYTES] = '\0'; | |
905 | err = virtblk_get_id(disk, buf); | |
906 | if (!err) | |
907 | return strlen(buf); | |
908 | ||
909 | if (err == -EIO) /* Unsupported? Make it empty. */ | |
910 | return 0; | |
911 | ||
912 | return err; | |
913 | } | |
393c525b | 914 | |
e982c4d0 | 915 | static DEVICE_ATTR_RO(serial); |
a5eb9e4f | 916 | |
daf2a501 SH |
917 | /* The queue's logical block size must be set before calling this */ |
918 | static void virtblk_update_capacity(struct virtio_blk *vblk, bool resize) | |
7a7c924c | 919 | { |
7a7c924c CH |
920 | struct virtio_device *vdev = vblk->vdev; |
921 | struct request_queue *q = vblk->disk->queue; | |
922 | char cap_str_2[10], cap_str_10[10]; | |
1046d304 | 923 | unsigned long long nblocks; |
b9f28d86 | 924 | u64 capacity; |
7a7c924c CH |
925 | |
926 | /* Host must always specify the capacity. */ | |
855e0c52 | 927 | virtio_cread(vdev, struct virtio_blk_config, capacity, &capacity); |
7a7c924c | 928 | |
1046d304 SH |
929 | nblocks = DIV_ROUND_UP_ULL(capacity, queue_logical_block_size(q) >> 9); |
930 | ||
931 | string_get_size(nblocks, queue_logical_block_size(q), | |
b9f28d86 | 932 | STRING_UNITS_2, cap_str_2, sizeof(cap_str_2)); |
1046d304 | 933 | string_get_size(nblocks, queue_logical_block_size(q), |
b9f28d86 | 934 | STRING_UNITS_10, cap_str_10, sizeof(cap_str_10)); |
7a7c924c CH |
935 | |
936 | dev_notice(&vdev->dev, | |
daf2a501 SH |
937 | "[%s] %s%llu %d-byte logical blocks (%s/%s)\n", |
938 | vblk->disk->disk_name, | |
939 | resize ? "new size: " : "", | |
1046d304 SH |
940 | nblocks, |
941 | queue_logical_block_size(q), | |
942 | cap_str_10, | |
943 | cap_str_2); | |
7a7c924c | 944 | |
449f4ec9 | 945 | set_capacity_and_notify(vblk->disk, capacity); |
daf2a501 SH |
946 | } |
947 | ||
948 | static void virtblk_config_changed_work(struct work_struct *work) | |
949 | { | |
950 | struct virtio_blk *vblk = | |
951 | container_of(work, struct virtio_blk, config_work); | |
daf2a501 SH |
952 | |
953 | virtblk_update_capacity(vblk, true); | |
7a7c924c CH |
954 | } |
955 | ||
956 | static void virtblk_config_changed(struct virtio_device *vdev) | |
957 | { | |
958 | struct virtio_blk *vblk = vdev->priv; | |
959 | ||
960 | queue_work(virtblk_wq, &vblk->config_work); | |
961 | } | |
962 | ||
6abd6e5a AS |
963 | static int init_vq(struct virtio_blk *vblk) |
964 | { | |
2ff98449 | 965 | int err; |
b8e07924 | 966 | unsigned short i; |
6a27b656 ML |
967 | vq_callback_t **callbacks; |
968 | const char **names; | |
969 | struct virtqueue **vqs; | |
970 | unsigned short num_vqs; | |
b8e07924 | 971 | unsigned short num_poll_vqs; |
6a27b656 | 972 | struct virtio_device *vdev = vblk->vdev; |
ad71473d | 973 | struct irq_affinity desc = { 0, }; |
6a27b656 ML |
974 | |
975 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_MQ, | |
976 | struct virtio_blk_config, num_queues, | |
977 | &num_vqs); | |
978 | if (err) | |
979 | num_vqs = 1; | |
4e040052 | 980 | |
6ae6ff6f | 981 | if (!err && !num_vqs) { |
63b4ffa4 | 982 | dev_err(&vdev->dev, "MQ advertised but zero queues reported\n"); |
6ae6ff6f JW |
983 | return -EINVAL; |
984 | } | |
6a27b656 | 985 | |
0989c41b MG |
986 | num_vqs = min_t(unsigned int, |
987 | min_not_zero(num_request_queues, nr_cpu_ids), | |
988 | num_vqs); | |
bf348f9b | 989 | |
4e040052 SK |
990 | num_poll_vqs = min_t(unsigned int, poll_queues, num_vqs - 1); |
991 | ||
992 | vblk->io_queues[HCTX_TYPE_DEFAULT] = num_vqs - num_poll_vqs; | |
993 | vblk->io_queues[HCTX_TYPE_READ] = 0; | |
994 | vblk->io_queues[HCTX_TYPE_POLL] = num_poll_vqs; | |
995 | ||
996 | dev_info(&vdev->dev, "%d/%d/%d default/read/poll queues\n", | |
997 | vblk->io_queues[HCTX_TYPE_DEFAULT], | |
998 | vblk->io_queues[HCTX_TYPE_READ], | |
999 | vblk->io_queues[HCTX_TYPE_POLL]); | |
1000 | ||
668866b6 | 1001 | vblk->vqs = kmalloc_array(num_vqs, sizeof(*vblk->vqs), GFP_KERNEL); |
347a5293 MH |
1002 | if (!vblk->vqs) |
1003 | return -ENOMEM; | |
6a27b656 | 1004 | |
668866b6 ME |
1005 | names = kmalloc_array(num_vqs, sizeof(*names), GFP_KERNEL); |
1006 | callbacks = kmalloc_array(num_vqs, sizeof(*callbacks), GFP_KERNEL); | |
1007 | vqs = kmalloc_array(num_vqs, sizeof(*vqs), GFP_KERNEL); | |
347a5293 MH |
1008 | if (!names || !callbacks || !vqs) { |
1009 | err = -ENOMEM; | |
1010 | goto out; | |
1011 | } | |
6abd6e5a | 1012 | |
4e040052 | 1013 | for (i = 0; i < num_vqs - num_poll_vqs; i++) { |
6a27b656 | 1014 | callbacks[i] = virtblk_done; |
b8e07924 | 1015 | snprintf(vblk->vqs[i].name, VQ_NAME_LEN, "req.%u", i); |
6a27b656 ML |
1016 | names[i] = vblk->vqs[i].name; |
1017 | } | |
1018 | ||
4e040052 SK |
1019 | for (; i < num_vqs; i++) { |
1020 | callbacks[i] = NULL; | |
b8e07924 | 1021 | snprintf(vblk->vqs[i].name, VQ_NAME_LEN, "req_poll.%u", i); |
4e040052 SK |
1022 | names[i] = vblk->vqs[i].name; |
1023 | } | |
1024 | ||
6a27b656 | 1025 | /* Discover virtqueues and write information to configuration. */ |
9b2bbdb2 | 1026 | err = virtio_find_vqs(vdev, num_vqs, vqs, callbacks, names, &desc); |
6a27b656 | 1027 | if (err) |
347a5293 | 1028 | goto out; |
6abd6e5a | 1029 | |
6a27b656 ML |
1030 | for (i = 0; i < num_vqs; i++) { |
1031 | spin_lock_init(&vblk->vqs[i].lock); | |
1032 | vblk->vqs[i].vq = vqs[i]; | |
1033 | } | |
1034 | vblk->num_vqs = num_vqs; | |
1035 | ||
347a5293 | 1036 | out: |
6a27b656 | 1037 | kfree(vqs); |
6a27b656 | 1038 | kfree(callbacks); |
6a27b656 | 1039 | kfree(names); |
6a27b656 ML |
1040 | if (err) |
1041 | kfree(vblk->vqs); | |
6abd6e5a AS |
1042 | return err; |
1043 | } | |
1044 | ||
c0aa3e09 RM |
1045 | /* |
1046 | * Legacy naming scheme used for virtio devices. We are stuck with it for | |
1047 | * virtio blk but don't ever use it for any new driver. | |
1048 | */ | |
1049 | static int virtblk_name_format(char *prefix, int index, char *buf, int buflen) | |
1050 | { | |
1051 | const int base = 'z' - 'a' + 1; | |
1052 | char *begin = buf + strlen(prefix); | |
1053 | char *end = buf + buflen; | |
1054 | char *p; | |
1055 | int unit; | |
1056 | ||
1057 | p = end - 1; | |
1058 | *p = '\0'; | |
1059 | unit = base; | |
1060 | do { | |
1061 | if (p == begin) | |
1062 | return -EINVAL; | |
1063 | *--p = 'a' + (index % unit); | |
1064 | index = (index / unit) - 1; | |
1065 | } while (index >= 0); | |
1066 | ||
1067 | memmove(begin, p, end - p); | |
1068 | memcpy(buf, prefix, strlen(prefix)); | |
1069 | ||
1070 | return 0; | |
1071 | } | |
1072 | ||
cd5d5038 PB |
1073 | static int virtblk_get_cache_mode(struct virtio_device *vdev) |
1074 | { | |
1075 | u8 writeback; | |
1076 | int err; | |
1077 | ||
855e0c52 RR |
1078 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE, |
1079 | struct virtio_blk_config, wce, | |
1080 | &writeback); | |
592002f5 MT |
1081 | |
1082 | /* | |
1083 | * If WCE is not configurable and flush is not available, | |
1084 | * assume no writeback cache is in use. | |
1085 | */ | |
cd5d5038 | 1086 | if (err) |
592002f5 | 1087 | writeback = virtio_has_feature(vdev, VIRTIO_BLK_F_FLUSH); |
cd5d5038 PB |
1088 | |
1089 | return writeback; | |
1090 | } | |
1091 | ||
1092 | static void virtblk_update_cache_mode(struct virtio_device *vdev) | |
1093 | { | |
1094 | u8 writeback = virtblk_get_cache_mode(vdev); | |
1095 | struct virtio_blk *vblk = vdev->priv; | |
1096 | ||
ad9126ac | 1097 | blk_queue_write_cache(vblk->disk->queue, writeback, false); |
cd5d5038 PB |
1098 | } |
1099 | ||
1100 | static const char *const virtblk_cache_types[] = { | |
1101 | "write through", "write back" | |
1102 | }; | |
1103 | ||
1104 | static ssize_t | |
e982c4d0 HR |
1105 | cache_type_store(struct device *dev, struct device_attribute *attr, |
1106 | const char *buf, size_t count) | |
cd5d5038 PB |
1107 | { |
1108 | struct gendisk *disk = dev_to_disk(dev); | |
1109 | struct virtio_blk *vblk = disk->private_data; | |
1110 | struct virtio_device *vdev = vblk->vdev; | |
1111 | int i; | |
cd5d5038 PB |
1112 | |
1113 | BUG_ON(!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_CONFIG_WCE)); | |
f53d5aa0 | 1114 | i = sysfs_match_string(virtblk_cache_types, buf); |
cd5d5038 | 1115 | if (i < 0) |
f53d5aa0 | 1116 | return i; |
cd5d5038 | 1117 | |
855e0c52 | 1118 | virtio_cwrite8(vdev, offsetof(struct virtio_blk_config, wce), i); |
cd5d5038 PB |
1119 | virtblk_update_cache_mode(vdev); |
1120 | return count; | |
1121 | } | |
1122 | ||
1123 | static ssize_t | |
e982c4d0 | 1124 | cache_type_show(struct device *dev, struct device_attribute *attr, char *buf) |
cd5d5038 PB |
1125 | { |
1126 | struct gendisk *disk = dev_to_disk(dev); | |
1127 | struct virtio_blk *vblk = disk->private_data; | |
1128 | u8 writeback = virtblk_get_cache_mode(vblk->vdev); | |
1129 | ||
1130 | BUG_ON(writeback >= ARRAY_SIZE(virtblk_cache_types)); | |
f1aa12f5 | 1131 | return sysfs_emit(buf, "%s\n", virtblk_cache_types[writeback]); |
cd5d5038 PB |
1132 | } |
1133 | ||
e982c4d0 HR |
1134 | static DEVICE_ATTR_RW(cache_type); |
1135 | ||
1136 | static struct attribute *virtblk_attrs[] = { | |
1137 | &dev_attr_serial.attr, | |
1138 | &dev_attr_cache_type.attr, | |
1139 | NULL, | |
1140 | }; | |
1141 | ||
1142 | static umode_t virtblk_attrs_are_visible(struct kobject *kobj, | |
1143 | struct attribute *a, int n) | |
1144 | { | |
4ce79063 | 1145 | struct device *dev = kobj_to_dev(kobj); |
e982c4d0 HR |
1146 | struct gendisk *disk = dev_to_disk(dev); |
1147 | struct virtio_blk *vblk = disk->private_data; | |
1148 | struct virtio_device *vdev = vblk->vdev; | |
1149 | ||
1150 | if (a == &dev_attr_cache_type.attr && | |
1151 | !virtio_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE)) | |
1152 | return S_IRUGO; | |
1153 | ||
1154 | return a->mode; | |
1155 | } | |
1156 | ||
1157 | static const struct attribute_group virtblk_attr_group = { | |
1158 | .attrs = virtblk_attrs, | |
1159 | .is_visible = virtblk_attrs_are_visible, | |
1160 | }; | |
1161 | ||
1162 | static const struct attribute_group *virtblk_attr_groups[] = { | |
1163 | &virtblk_attr_group, | |
1164 | NULL, | |
1165 | }; | |
cd5d5038 | 1166 | |
a4e1d0b7 | 1167 | static void virtblk_map_queues(struct blk_mq_tag_set *set) |
ad71473d CH |
1168 | { |
1169 | struct virtio_blk *vblk = set->driver_data; | |
4e040052 SK |
1170 | int i, qoff; |
1171 | ||
1172 | for (i = 0, qoff = 0; i < set->nr_maps; i++) { | |
1173 | struct blk_mq_queue_map *map = &set->map[i]; | |
1174 | ||
1175 | map->nr_queues = vblk->io_queues[i]; | |
1176 | map->queue_offset = qoff; | |
1177 | qoff += map->nr_queues; | |
1178 | ||
1179 | if (map->nr_queues == 0) | |
1180 | continue; | |
1181 | ||
1182 | /* | |
1183 | * Regular queues have interrupts and hence CPU affinity is | |
1184 | * defined by the core virtio code, but polling queues have | |
1185 | * no interrupts so we let the block layer assign CPU affinity. | |
1186 | */ | |
1187 | if (i == HCTX_TYPE_POLL) | |
1188 | blk_mq_map_queues(&set->map[i]); | |
1189 | else | |
1190 | blk_mq_virtio_map_queues(&set->map[i], vblk->vdev, 0); | |
1191 | } | |
4e040052 SK |
1192 | } |
1193 | ||
afd384f0 MT |
1194 | static void virtblk_complete_batch(struct io_comp_batch *iob) |
1195 | { | |
1196 | struct request *req; | |
1197 | ||
1198 | rq_list_for_each(&iob->req_list, req) { | |
1199 | virtblk_unmap_data(req, blk_mq_rq_to_pdu(req)); | |
1200 | virtblk_cleanup_cmd(req); | |
1201 | } | |
1202 | blk_mq_end_request_batch(iob); | |
1203 | } | |
1204 | ||
4e040052 SK |
1205 | static int virtblk_poll(struct blk_mq_hw_ctx *hctx, struct io_comp_batch *iob) |
1206 | { | |
1207 | struct virtio_blk *vblk = hctx->queue->queuedata; | |
8d12ec10 | 1208 | struct virtio_blk_vq *vq = get_virtio_blk_vq(hctx); |
afd384f0 | 1209 | struct virtblk_req *vbr; |
4e040052 | 1210 | unsigned long flags; |
afd384f0 | 1211 | unsigned int len; |
4e040052 SK |
1212 | int found = 0; |
1213 | ||
1214 | spin_lock_irqsave(&vq->lock, flags); | |
afd384f0 MT |
1215 | |
1216 | while ((vbr = virtqueue_get_buf(vq->vq, &len)) != NULL) { | |
1217 | struct request *req = blk_mq_rq_from_pdu(vbr); | |
1218 | ||
1219 | found++; | |
1220 | if (!blk_mq_complete_request_remote(req) && | |
1221 | !blk_mq_add_to_batch(req, iob, virtblk_vbr_status(vbr), | |
1222 | virtblk_complete_batch)) | |
1223 | virtblk_request_done(req); | |
1224 | } | |
4e040052 SK |
1225 | |
1226 | if (found) | |
1227 | blk_mq_start_stopped_hw_queues(vblk->disk->queue, true); | |
1228 | ||
1229 | spin_unlock_irqrestore(&vq->lock, flags); | |
1230 | ||
1231 | return found; | |
1232 | } | |
1233 | ||
f363b089 | 1234 | static const struct blk_mq_ops virtio_mq_ops = { |
1cf7e9c6 | 1235 | .queue_rq = virtio_queue_rq, |
0e9911fa | 1236 | .queue_rqs = virtio_queue_rqs, |
944e7c87 | 1237 | .commit_rqs = virtio_commit_rqs, |
5124c285 | 1238 | .complete = virtblk_request_done, |
ad71473d | 1239 | .map_queues = virtblk_map_queues, |
4e040052 | 1240 | .poll = virtblk_poll, |
1cf7e9c6 JA |
1241 | }; |
1242 | ||
24d2f903 CH |
1243 | static unsigned int virtblk_queue_depth; |
1244 | module_param_named(queue_depth, virtblk_queue_depth, uint, 0444); | |
1cf7e9c6 | 1245 | |
8b837256 CH |
1246 | static int virtblk_read_limits(struct virtio_blk *vblk, |
1247 | struct queue_limits *lim) | |
e467cde2 | 1248 | { |
718628ad | 1249 | struct virtio_device *vdev = vblk->vdev; |
fd1068e1 | 1250 | u32 v, blk_size, max_size, sg_elems, opt_io_size; |
e60d6407 AK |
1251 | u32 max_discard_segs = 0; |
1252 | u32 discard_granularity = 0; | |
69740c8b CH |
1253 | u16 min_io_size; |
1254 | u8 physical_block_exp, alignment_offset; | |
fafb51a6 | 1255 | size_t max_dma_size; |
718628ad | 1256 | int err; |
4f3bf19c | 1257 | |
0864b79a | 1258 | /* We need to know how many segments before we allocate. */ |
855e0c52 RR |
1259 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SEG_MAX, |
1260 | struct virtio_blk_config, seg_max, | |
1261 | &sg_elems); | |
a5b365a6 CH |
1262 | |
1263 | /* We need at least one SG element, whatever they say. */ | |
1264 | if (err || !sg_elems) | |
0864b79a RR |
1265 | sg_elems = 1; |
1266 | ||
63947b34 SH |
1267 | /* Prevent integer overflows and honor max vq size */ |
1268 | sg_elems = min_t(u32, sg_elems, VIRTIO_BLK_MAX_SG_ELEMS - 2); | |
1269 | ||
0864b79a | 1270 | /* We can handle whatever the host told us to handle. */ |
8b837256 | 1271 | lim->max_segments = sg_elems; |
0864b79a | 1272 | |
4b7f7e20 | 1273 | /* No real sector limit. */ |
8b837256 | 1274 | lim->max_hw_sectors = UINT_MAX; |
4b7f7e20 | 1275 | |
fafb51a6 | 1276 | max_dma_size = virtio_max_dma_size(vdev); |
1277 | max_size = max_dma_size > U32_MAX ? U32_MAX : max_dma_size; | |
fd1068e1 | 1278 | |
a586d4f6 RR |
1279 | /* Host can optionally specify maximum segment size and number of |
1280 | * segments. */ | |
855e0c52 RR |
1281 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SIZE_MAX, |
1282 | struct virtio_blk_config, size_max, &v); | |
e467cde2 | 1283 | if (!err) |
fd1068e1 JR |
1284 | max_size = min(max_size, v); |
1285 | ||
8b837256 | 1286 | lim->max_segment_size = max_size; |
e467cde2 | 1287 | |
066f4d82 | 1288 | /* Host can optionally specify the block size of the device */ |
855e0c52 RR |
1289 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_BLK_SIZE, |
1290 | struct virtio_blk_config, blk_size, | |
1291 | &blk_size); | |
57a13a5b XY |
1292 | if (!err) { |
1293 | err = blk_validate_block_size(blk_size); | |
1294 | if (err) { | |
1295 | dev_err(&vdev->dev, | |
1296 | "virtio_blk: invalid block size: 0x%x\n", | |
1297 | blk_size); | |
718628ad | 1298 | return err; |
57a13a5b XY |
1299 | } |
1300 | ||
8b837256 | 1301 | lim->logical_block_size = blk_size; |
57a13a5b | 1302 | } else |
8b837256 | 1303 | blk_size = lim->logical_block_size; |
69740c8b CH |
1304 | |
1305 | /* Use topology information if available */ | |
855e0c52 RR |
1306 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY, |
1307 | struct virtio_blk_config, physical_block_exp, | |
1308 | &physical_block_exp); | |
69740c8b | 1309 | if (!err && physical_block_exp) |
8b837256 | 1310 | lim->physical_block_size = blk_size * (1 << physical_block_exp); |
69740c8b | 1311 | |
855e0c52 RR |
1312 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY, |
1313 | struct virtio_blk_config, alignment_offset, | |
1314 | &alignment_offset); | |
69740c8b | 1315 | if (!err && alignment_offset) |
8b837256 | 1316 | lim->alignment_offset = blk_size * alignment_offset; |
69740c8b | 1317 | |
855e0c52 RR |
1318 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY, |
1319 | struct virtio_blk_config, min_io_size, | |
1320 | &min_io_size); | |
69740c8b | 1321 | if (!err && min_io_size) |
8b837256 | 1322 | lim->io_min = blk_size * min_io_size; |
69740c8b | 1323 | |
855e0c52 RR |
1324 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY, |
1325 | struct virtio_blk_config, opt_io_size, | |
1326 | &opt_io_size); | |
69740c8b | 1327 | if (!err && opt_io_size) |
8b837256 | 1328 | lim->io_opt = blk_size * opt_io_size; |
69740c8b | 1329 | |
1f23816b | 1330 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_DISCARD)) { |
1f23816b | 1331 | virtio_cread(vdev, struct virtio_blk_config, |
e60d6407 | 1332 | discard_sector_alignment, &discard_granularity); |
1f23816b CL |
1333 | |
1334 | virtio_cread(vdev, struct virtio_blk_config, | |
1335 | max_discard_sectors, &v); | |
8b837256 | 1336 | lim->max_hw_discard_sectors = v ? v : UINT_MAX; |
1f23816b CL |
1337 | |
1338 | virtio_cread(vdev, struct virtio_blk_config, max_discard_seg, | |
e60d6407 | 1339 | &max_discard_segs); |
1f23816b CL |
1340 | } |
1341 | ||
1342 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_WRITE_ZEROES)) { | |
1343 | virtio_cread(vdev, struct virtio_blk_config, | |
1344 | max_write_zeroes_sectors, &v); | |
8b837256 | 1345 | lim->max_write_zeroes_sectors = v ? v : UINT_MAX; |
1f23816b CL |
1346 | } |
1347 | ||
e60d6407 AK |
1348 | /* The discard and secure erase limits are combined since the Linux |
1349 | * block layer uses the same limit for both commands. | |
1350 | * | |
1351 | * If both VIRTIO_BLK_F_SECURE_ERASE and VIRTIO_BLK_F_DISCARD features | |
1352 | * are negotiated, we will use the minimum between the limits. | |
1353 | * | |
1354 | * discard sector alignment is set to the minimum between discard_sector_alignment | |
1355 | * and secure_erase_sector_alignment. | |
1356 | * | |
1357 | * max discard sectors is set to the minimum between max_discard_seg and | |
1358 | * max_secure_erase_seg. | |
1359 | */ | |
1360 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_SECURE_ERASE)) { | |
1361 | ||
1362 | virtio_cread(vdev, struct virtio_blk_config, | |
1363 | secure_erase_sector_alignment, &v); | |
1364 | ||
1365 | /* secure_erase_sector_alignment should not be zero, the device should set a | |
1366 | * valid number of sectors. | |
1367 | */ | |
1368 | if (!v) { | |
1369 | dev_err(&vdev->dev, | |
1370 | "virtio_blk: secure_erase_sector_alignment can't be 0\n"); | |
718628ad | 1371 | return -EINVAL; |
e60d6407 AK |
1372 | } |
1373 | ||
1374 | discard_granularity = min_not_zero(discard_granularity, v); | |
1375 | ||
1376 | virtio_cread(vdev, struct virtio_blk_config, | |
1377 | max_secure_erase_sectors, &v); | |
1378 | ||
1379 | /* max_secure_erase_sectors should not be zero, the device should set a | |
1380 | * valid number of sectors. | |
1381 | */ | |
1382 | if (!v) { | |
1383 | dev_err(&vdev->dev, | |
1384 | "virtio_blk: max_secure_erase_sectors can't be 0\n"); | |
718628ad | 1385 | return -EINVAL; |
e60d6407 AK |
1386 | } |
1387 | ||
8b837256 | 1388 | lim->max_secure_erase_sectors = v; |
e60d6407 AK |
1389 | |
1390 | virtio_cread(vdev, struct virtio_blk_config, | |
1391 | max_secure_erase_seg, &v); | |
1392 | ||
1393 | /* max_secure_erase_seg should not be zero, the device should set a | |
1394 | * valid number of segments | |
1395 | */ | |
1396 | if (!v) { | |
1397 | dev_err(&vdev->dev, | |
1398 | "virtio_blk: max_secure_erase_seg can't be 0\n"); | |
718628ad | 1399 | return -EINVAL; |
e60d6407 AK |
1400 | } |
1401 | ||
1402 | max_discard_segs = min_not_zero(max_discard_segs, v); | |
1403 | } | |
1404 | ||
1405 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_DISCARD) || | |
1406 | virtio_has_feature(vdev, VIRTIO_BLK_F_SECURE_ERASE)) { | |
1407 | /* max_discard_seg and discard_granularity will be 0 only | |
1408 | * if max_discard_seg and discard_sector_alignment fields in the virtio | |
1409 | * config are 0 and VIRTIO_BLK_F_SECURE_ERASE feature is not negotiated. | |
1410 | * In this case, we use default values. | |
1411 | */ | |
1412 | if (!max_discard_segs) | |
1413 | max_discard_segs = sg_elems; | |
1414 | ||
8b837256 CH |
1415 | lim->max_discard_segments = |
1416 | min(max_discard_segs, MAX_DISCARD_SEGMENTS); | |
e60d6407 AK |
1417 | |
1418 | if (discard_granularity) | |
8b837256 CH |
1419 | lim->discard_granularity = |
1420 | discard_granularity << SECTOR_SHIFT; | |
e60d6407 | 1421 | else |
8b837256 | 1422 | lim->discard_granularity = blk_size; |
e60d6407 AK |
1423 | } |
1424 | ||
10805eb5 | 1425 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_ZONED)) { |
77360cad CH |
1426 | u8 model; |
1427 | ||
8b837256 | 1428 | virtio_cread(vdev, struct virtio_blk_config, zoned.model, &model); |
77360cad CH |
1429 | switch (model) { |
1430 | case VIRTIO_BLK_Z_NONE: | |
1431 | case VIRTIO_BLK_Z_HA: | |
8b837256 CH |
1432 | /* treat host-aware devices as non-zoned */ |
1433 | return 0; | |
77360cad | 1434 | case VIRTIO_BLK_Z_HM: |
8b837256 | 1435 | err = virtblk_read_zoned_limits(vblk, lim); |
77360cad | 1436 | if (err) |
8b837256 | 1437 | return err; |
77360cad CH |
1438 | break; |
1439 | default: | |
8b837256 CH |
1440 | dev_err(&vdev->dev, "unsupported zone model %d\n", model); |
1441 | return -EINVAL; | |
77360cad | 1442 | } |
95bfec41 DF |
1443 | } |
1444 | ||
718628ad CH |
1445 | return 0; |
1446 | } | |
1447 | ||
1448 | static int virtblk_probe(struct virtio_device *vdev) | |
1449 | { | |
1450 | struct virtio_blk *vblk; | |
8b837256 | 1451 | struct queue_limits lim = { }; |
718628ad CH |
1452 | int err, index; |
1453 | unsigned int queue_depth; | |
1454 | ||
1455 | if (!vdev->config->get) { | |
1456 | dev_err(&vdev->dev, "%s failure: config access disabled\n", | |
1457 | __func__); | |
1458 | return -EINVAL; | |
1459 | } | |
1460 | ||
1461 | err = ida_alloc_range(&vd_index_ida, 0, | |
1462 | minor_to_index(1 << MINORBITS) - 1, GFP_KERNEL); | |
1463 | if (err < 0) | |
1464 | goto out; | |
1465 | index = err; | |
1466 | ||
1467 | vdev->priv = vblk = kmalloc(sizeof(*vblk), GFP_KERNEL); | |
1468 | if (!vblk) { | |
1469 | err = -ENOMEM; | |
1470 | goto out_free_index; | |
1471 | } | |
1472 | ||
1473 | mutex_init(&vblk->vdev_mutex); | |
1474 | ||
1475 | vblk->vdev = vdev; | |
1476 | ||
1477 | INIT_WORK(&vblk->config_work, virtblk_config_changed_work); | |
1478 | ||
1479 | err = init_vq(vblk); | |
1480 | if (err) | |
1481 | goto out_free_vblk; | |
1482 | ||
1483 | /* Default queue sizing is to fill the ring. */ | |
1484 | if (!virtblk_queue_depth) { | |
1485 | queue_depth = vblk->vqs[0].vq->num_free; | |
1486 | /* ... but without indirect descs, we use 2 descs per req */ | |
1487 | if (!virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC)) | |
1488 | queue_depth /= 2; | |
1489 | } else { | |
1490 | queue_depth = virtblk_queue_depth; | |
1491 | } | |
1492 | ||
1493 | memset(&vblk->tag_set, 0, sizeof(vblk->tag_set)); | |
1494 | vblk->tag_set.ops = &virtio_mq_ops; | |
1495 | vblk->tag_set.queue_depth = queue_depth; | |
1496 | vblk->tag_set.numa_node = NUMA_NO_NODE; | |
1497 | vblk->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; | |
1498 | vblk->tag_set.cmd_size = | |
1499 | sizeof(struct virtblk_req) + | |
1500 | sizeof(struct scatterlist) * VIRTIO_BLK_INLINE_SG_CNT; | |
1501 | vblk->tag_set.driver_data = vblk; | |
1502 | vblk->tag_set.nr_hw_queues = vblk->num_vqs; | |
1503 | vblk->tag_set.nr_maps = 1; | |
1504 | if (vblk->io_queues[HCTX_TYPE_POLL]) | |
1505 | vblk->tag_set.nr_maps = 3; | |
1506 | ||
1507 | err = blk_mq_alloc_tag_set(&vblk->tag_set); | |
1508 | if (err) | |
1509 | goto out_free_vq; | |
1510 | ||
8b837256 CH |
1511 | err = virtblk_read_limits(vblk, &lim); |
1512 | if (err) | |
1513 | goto out_free_tags; | |
1514 | ||
1515 | vblk->disk = blk_mq_alloc_disk(&vblk->tag_set, &lim, vblk); | |
718628ad CH |
1516 | if (IS_ERR(vblk->disk)) { |
1517 | err = PTR_ERR(vblk->disk); | |
1518 | goto out_free_tags; | |
1519 | } | |
718628ad CH |
1520 | |
1521 | virtblk_name_format("vd", index, vblk->disk->disk_name, DISK_NAME_LEN); | |
1522 | ||
1523 | vblk->disk->major = major; | |
1524 | vblk->disk->first_minor = index_to_minor(index); | |
1525 | vblk->disk->minors = 1 << PART_BITS; | |
1526 | vblk->disk->private_data = vblk; | |
1527 | vblk->disk->fops = &virtblk_fops; | |
1528 | vblk->index = index; | |
1529 | ||
1530 | /* configure queue flush support */ | |
1531 | virtblk_update_cache_mode(vdev); | |
1532 | ||
1533 | /* If disk is read-only in the host, the guest should obey */ | |
1534 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO)) | |
1535 | set_disk_ro(vblk->disk, 1); | |
1536 | ||
daf2a501 | 1537 | virtblk_update_capacity(vblk, false); |
7a11370e MT |
1538 | virtio_device_ready(vdev); |
1539 | ||
10805eb5 DF |
1540 | /* |
1541 | * All steps that follow use the VQs therefore they need to be | |
1542 | * placed after the virtio_device_ready() call above. | |
1543 | */ | |
8b837256 CH |
1544 | if (IS_ENABLED(CONFIG_BLK_DEV_ZONED) && lim.zoned) { |
1545 | blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, vblk->disk->queue); | |
1546 | err = blk_revalidate_disk_zones(vblk->disk, NULL); | |
1547 | if (err) | |
95bfec41 DF |
1548 | goto out_cleanup_disk; |
1549 | } | |
1550 | ||
dbb301f9 LC |
1551 | err = device_add_disk(&vdev->dev, vblk->disk, virtblk_attr_groups); |
1552 | if (err) | |
1553 | goto out_cleanup_disk; | |
1554 | ||
e467cde2 RR |
1555 | return 0; |
1556 | ||
dbb301f9 | 1557 | out_cleanup_disk: |
8b9ab626 | 1558 | put_disk(vblk->disk); |
24d2f903 CH |
1559 | out_free_tags: |
1560 | blk_mq_free_tag_set(&vblk->tag_set); | |
e467cde2 | 1561 | out_free_vq: |
d2a7ddda | 1562 | vdev->config->del_vqs(vdev); |
e7eea44e | 1563 | kfree(vblk->vqs); |
e467cde2 RR |
1564 | out_free_vblk: |
1565 | kfree(vblk); | |
5087a50e | 1566 | out_free_index: |
92a34c46 | 1567 | ida_free(&vd_index_ida, index); |
e467cde2 RR |
1568 | out: |
1569 | return err; | |
1570 | } | |
1571 | ||
8d85fce7 | 1572 | static void virtblk_remove(struct virtio_device *vdev) |
e467cde2 RR |
1573 | { |
1574 | struct virtio_blk *vblk = vdev->priv; | |
e467cde2 | 1575 | |
cc74f719 MT |
1576 | /* Make sure no work handler is accessing the device. */ |
1577 | flush_work(&vblk->config_work); | |
7a7c924c | 1578 | |
02e2b124 | 1579 | del_gendisk(vblk->disk); |
24d2f903 CH |
1580 | blk_mq_free_tag_set(&vblk->tag_set); |
1581 | ||
90b5feb8 SH |
1582 | mutex_lock(&vblk->vdev_mutex); |
1583 | ||
6e5aa7ef | 1584 | /* Stop all the virtqueues. */ |
d9679d00 | 1585 | virtio_reset_device(vdev); |
6e5aa7ef | 1586 | |
90b5feb8 SH |
1587 | /* Virtqueues are stopped, nothing can use vblk->vdev anymore. */ |
1588 | vblk->vdev = NULL; | |
1589 | ||
d2a7ddda | 1590 | vdev->config->del_vqs(vdev); |
6a27b656 | 1591 | kfree(vblk->vqs); |
f4953fe6 | 1592 | |
90b5feb8 SH |
1593 | mutex_unlock(&vblk->vdev_mutex); |
1594 | ||
24b45e6c | 1595 | put_disk(vblk->disk); |
e467cde2 RR |
1596 | } |
1597 | ||
89107000 | 1598 | #ifdef CONFIG_PM_SLEEP |
f8fb5bc2 AS |
1599 | static int virtblk_freeze(struct virtio_device *vdev) |
1600 | { | |
1601 | struct virtio_blk *vblk = vdev->priv; | |
1602 | ||
4ce6e2db YS |
1603 | /* Ensure no requests in virtqueues before deleting vqs. */ |
1604 | blk_mq_freeze_queue(vblk->disk->queue); | |
1605 | ||
f8fb5bc2 | 1606 | /* Ensure we don't receive any more interrupts */ |
d9679d00 | 1607 | virtio_reset_device(vdev); |
f8fb5bc2 | 1608 | |
cc74f719 | 1609 | /* Make sure no work handler is accessing the device. */ |
f8fb5bc2 AS |
1610 | flush_work(&vblk->config_work); |
1611 | ||
f8fb5bc2 | 1612 | vdev->config->del_vqs(vdev); |
b71ba22e XY |
1613 | kfree(vblk->vqs); |
1614 | ||
f8fb5bc2 AS |
1615 | return 0; |
1616 | } | |
1617 | ||
1618 | static int virtblk_restore(struct virtio_device *vdev) | |
1619 | { | |
1620 | struct virtio_blk *vblk = vdev->priv; | |
1621 | int ret; | |
1622 | ||
f8fb5bc2 | 1623 | ret = init_vq(vdev->priv); |
6d62c37f MT |
1624 | if (ret) |
1625 | return ret; | |
1626 | ||
1627 | virtio_device_ready(vdev); | |
1cf7e9c6 | 1628 | |
4ce6e2db | 1629 | blk_mq_unfreeze_queue(vblk->disk->queue); |
6d62c37f | 1630 | return 0; |
f8fb5bc2 AS |
1631 | } |
1632 | #endif | |
1633 | ||
47483e25 | 1634 | static const struct virtio_device_id id_table[] = { |
e467cde2 RR |
1635 | { VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID }, |
1636 | { 0 }, | |
1637 | }; | |
1638 | ||
19c1c5a6 | 1639 | static unsigned int features_legacy[] = { |
02c42b7a | 1640 | VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY, |
97b50a65 | 1641 | VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, |
592002f5 | 1642 | VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE, |
1f23816b | 1643 | VIRTIO_BLK_F_MQ, VIRTIO_BLK_F_DISCARD, VIRTIO_BLK_F_WRITE_ZEROES, |
e60d6407 | 1644 | VIRTIO_BLK_F_SECURE_ERASE, |
19c1c5a6 MT |
1645 | } |
1646 | ; | |
1647 | static unsigned int features[] = { | |
1648 | VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY, | |
1649 | VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, | |
592002f5 | 1650 | VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE, |
1f23816b | 1651 | VIRTIO_BLK_F_MQ, VIRTIO_BLK_F_DISCARD, VIRTIO_BLK_F_WRITE_ZEROES, |
10805eb5 | 1652 | VIRTIO_BLK_F_SECURE_ERASE, VIRTIO_BLK_F_ZONED, |
c45a6816 RR |
1653 | }; |
1654 | ||
8d85fce7 | 1655 | static struct virtio_driver virtio_blk = { |
19c1c5a6 MT |
1656 | .feature_table = features, |
1657 | .feature_table_size = ARRAY_SIZE(features), | |
1658 | .feature_table_legacy = features_legacy, | |
1659 | .feature_table_size_legacy = ARRAY_SIZE(features_legacy), | |
1660 | .driver.name = KBUILD_MODNAME, | |
1661 | .driver.owner = THIS_MODULE, | |
1662 | .id_table = id_table, | |
1663 | .probe = virtblk_probe, | |
1664 | .remove = virtblk_remove, | |
1665 | .config_changed = virtblk_config_changed, | |
89107000 | 1666 | #ifdef CONFIG_PM_SLEEP |
19c1c5a6 MT |
1667 | .freeze = virtblk_freeze, |
1668 | .restore = virtblk_restore, | |
f8fb5bc2 | 1669 | #endif |
e467cde2 RR |
1670 | }; |
1671 | ||
bcfe9b6c | 1672 | static int __init virtio_blk_init(void) |
e467cde2 | 1673 | { |
7a7c924c CH |
1674 | int error; |
1675 | ||
1676 | virtblk_wq = alloc_workqueue("virtio-blk", 0, 0); | |
1677 | if (!virtblk_wq) | |
1678 | return -ENOMEM; | |
1679 | ||
4f3bf19c | 1680 | major = register_blkdev(0, "virtblk"); |
7a7c924c CH |
1681 | if (major < 0) { |
1682 | error = major; | |
1683 | goto out_destroy_workqueue; | |
1684 | } | |
1685 | ||
1686 | error = register_virtio_driver(&virtio_blk); | |
1687 | if (error) | |
1688 | goto out_unregister_blkdev; | |
1689 | return 0; | |
1690 | ||
1691 | out_unregister_blkdev: | |
1692 | unregister_blkdev(major, "virtblk"); | |
1693 | out_destroy_workqueue: | |
1694 | destroy_workqueue(virtblk_wq); | |
1695 | return error; | |
e467cde2 RR |
1696 | } |
1697 | ||
bcfe9b6c | 1698 | static void __exit virtio_blk_fini(void) |
e467cde2 RR |
1699 | { |
1700 | unregister_virtio_driver(&virtio_blk); | |
38f37b57 | 1701 | unregister_blkdev(major, "virtblk"); |
7a7c924c | 1702 | destroy_workqueue(virtblk_wq); |
e467cde2 | 1703 | } |
bcfe9b6c RD |
1704 | module_init(virtio_blk_init); |
1705 | module_exit(virtio_blk_fini); | |
e467cde2 RR |
1706 | |
1707 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1708 | MODULE_DESCRIPTION("Virtio block driver"); | |
1709 | MODULE_LICENSE("GPL"); |