1 // SPDX-License-Identifier: GPL-2.0-only
3 #include <linux/spinlock.h>
4 #include <linux/slab.h>
5 #include <linux/blkdev.h>
6 #include <linux/hdreg.h>
7 #include <linux/module.h>
8 #include <linux/mutex.h>
9 #include <linux/interrupt.h>
10 #include <linux/virtio.h>
11 #include <linux/virtio_blk.h>
12 #include <linux/scatterlist.h>
13 #include <linux/string_helpers.h>
14 #include <linux/idr.h>
15 #include <linux/blk-mq.h>
16 #include <linux/blk-mq-virtio.h>
17 #include <linux/numa.h>
18 #include <linux/vmalloc.h>
19 #include <uapi/linux/virtio_ring.h>
22 #define VQ_NAME_LEN 16
23 #define MAX_DISCARD_SEGMENTS 256u
25 /* The maximum number of sg elements that fit into a virtqueue */
26 #define VIRTIO_BLK_MAX_SG_ELEMS 32768
28 #ifdef CONFIG_ARCH_NO_SG_CHAIN
29 #define VIRTIO_BLK_INLINE_SG_CNT 0
31 #define VIRTIO_BLK_INLINE_SG_CNT 2
34 static unsigned int num_request_queues;
35 module_param(num_request_queues, uint, 0644);
36 MODULE_PARM_DESC(num_request_queues,
37 "Limit the number of request queues to use for blk device. "
39 "Values > nr_cpu_ids truncated to nr_cpu_ids.");
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");
46 static DEFINE_IDA(vd_index_ida);
48 static struct workqueue_struct *virtblk_wq;
50 struct virtio_blk_vq {
53 char name[VQ_NAME_LEN];
54 } ____cacheline_aligned_in_smp;
58 * This mutex must be held by anything that may run after
59 * virtblk_remove() sets vblk->vdev to NULL.
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
65 struct mutex vdev_mutex;
66 struct virtio_device *vdev;
68 /* The disk structure for the kernel. */
71 /* Block layer tags. */
72 struct blk_mq_tag_set tag_set;
74 /* Process context for config space updates */
75 struct work_struct config_work;
77 /* Ida index - used to track minor number allocations. */
82 int io_queues[HCTX_MAX_TYPES];
83 struct virtio_blk_vq *vqs;
85 /* For zoned device */
86 unsigned int zone_sectors;
91 struct virtio_blk_outhdr out_hdr;
98 * The zone append command has an extended in header.
99 * The status field in zone_append_in_hdr must always
110 struct sg_table sg_table;
111 struct scatterlist sg[];
114 static inline blk_status_t virtblk_result(u8 status)
117 case VIRTIO_BLK_S_OK:
119 case VIRTIO_BLK_S_UNSUPP:
120 return BLK_STS_NOTSUPP;
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:
128 return BLK_STS_IOERR;
132 static inline struct virtio_blk_vq *get_virtio_blk_vq(struct blk_mq_hw_ctx *hctx)
134 struct virtio_blk *vblk = hctx->queue->queuedata;
135 struct virtio_blk_vq *vq = &vblk->vqs[hctx->queue_num];
140 static int virtblk_add_req(struct virtqueue *vq, struct virtblk_req *vbr)
142 struct scatterlist out_hdr, in_hdr, *sgs[3];
143 unsigned int num_out = 0, num_in = 0;
145 sg_init_one(&out_hdr, &vbr->out_hdr, sizeof(vbr->out_hdr));
146 sgs[num_out++] = &out_hdr;
148 if (vbr->sg_table.nents) {
149 if (vbr->out_hdr.type & cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_OUT))
150 sgs[num_out++] = vbr->sg_table.sgl;
152 sgs[num_out + num_in++] = vbr->sg_table.sgl;
155 sg_init_one(&in_hdr, &vbr->in_hdr.status, vbr->in_hdr_len);
156 sgs[num_out + num_in++] = &in_hdr;
158 return virtqueue_add_sgs(vq, sgs, num_out, num_in, vbr, GFP_ATOMIC);
161 static int virtblk_setup_discard_write_zeroes_erase(struct request *req, bool unmap)
163 unsigned short segments = blk_rq_nr_discard_segments(req);
164 unsigned short n = 0;
165 struct virtio_blk_discard_write_zeroes *range;
170 flags |= VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP;
172 range = kmalloc_array(segments, sizeof(*range), GFP_ATOMIC);
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
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));
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;
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);
199 WARN_ON_ONCE(n != segments);
201 bvec_set_virt(&req->special_vec, range, sizeof(*range) * segments);
202 req->rq_flags |= RQF_SPECIAL_PAYLOAD;
207 static void virtblk_unmap_data(struct request *req, struct virtblk_req *vbr)
209 if (blk_rq_nr_phys_segments(req))
210 sg_free_table_chained(&vbr->sg_table,
211 VIRTIO_BLK_INLINE_SG_CNT);
214 static int virtblk_map_data(struct blk_mq_hw_ctx *hctx, struct request *req,
215 struct virtblk_req *vbr)
219 if (!blk_rq_nr_phys_segments(req))
222 vbr->sg_table.sgl = vbr->sg;
223 err = sg_alloc_table_chained(&vbr->sg_table,
224 blk_rq_nr_phys_segments(req),
226 VIRTIO_BLK_INLINE_SG_CNT);
230 return blk_rq_map_sg(hctx->queue, req, vbr->sg_table.sgl);
233 static void virtblk_cleanup_cmd(struct request *req)
235 if (req->rq_flags & RQF_SPECIAL_PAYLOAD)
236 kfree(bvec_virt(&req->special_vec));
239 static blk_status_t virtblk_setup_cmd(struct virtio_device *vdev,
241 struct virtblk_req *vbr)
243 size_t in_hdr_len = sizeof(vbr->in_hdr.status);
248 if (!IS_ENABLED(CONFIG_BLK_DEV_ZONED) && op_is_zone_mgmt(req_op(req)))
249 return BLK_STS_NOTSUPP;
251 /* Set fields for all request types */
252 vbr->out_hdr.ioprio = cpu_to_virtio32(vdev, req_get_ioprio(req));
254 switch (req_op(req)) {
256 type = VIRTIO_BLK_T_IN;
257 sector = blk_rq_pos(req);
260 type = VIRTIO_BLK_T_OUT;
261 sector = blk_rq_pos(req);
264 type = VIRTIO_BLK_T_FLUSH;
267 type = VIRTIO_BLK_T_DISCARD;
269 case REQ_OP_WRITE_ZEROES:
270 type = VIRTIO_BLK_T_WRITE_ZEROES;
271 unmap = !(req->cmd_flags & REQ_NOUNMAP);
273 case REQ_OP_SECURE_ERASE:
274 type = VIRTIO_BLK_T_SECURE_ERASE;
276 case REQ_OP_ZONE_OPEN:
277 type = VIRTIO_BLK_T_ZONE_OPEN;
278 sector = blk_rq_pos(req);
280 case REQ_OP_ZONE_CLOSE:
281 type = VIRTIO_BLK_T_ZONE_CLOSE;
282 sector = blk_rq_pos(req);
284 case REQ_OP_ZONE_FINISH:
285 type = VIRTIO_BLK_T_ZONE_FINISH;
286 sector = blk_rq_pos(req);
288 case REQ_OP_ZONE_APPEND:
289 type = VIRTIO_BLK_T_ZONE_APPEND;
290 sector = blk_rq_pos(req);
291 in_hdr_len = sizeof(vbr->in_hdr.zone_append);
293 case REQ_OP_ZONE_RESET:
294 type = VIRTIO_BLK_T_ZONE_RESET;
295 sector = blk_rq_pos(req);
297 case REQ_OP_ZONE_RESET_ALL:
298 type = VIRTIO_BLK_T_ZONE_RESET_ALL;
302 * Out header has already been prepared by the caller (virtblk_get_id()
303 * or virtblk_submit_zone_report()), nothing to do here.
308 return BLK_STS_IOERR;
311 /* Set fields for non-REQ_OP_DRV_IN request types */
312 vbr->in_hdr_len = in_hdr_len;
313 vbr->out_hdr.type = cpu_to_virtio32(vdev, type);
314 vbr->out_hdr.sector = cpu_to_virtio64(vdev, sector);
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))
319 return BLK_STS_RESOURCE;
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.
330 static inline u8 virtblk_vbr_status(struct virtblk_req *vbr)
332 return *((u8 *)&vbr->in_hdr + vbr->in_hdr_len - 1);
335 static inline void virtblk_request_done(struct request *req)
337 struct virtblk_req *vbr = blk_mq_rq_to_pdu(req);
338 blk_status_t status = virtblk_result(virtblk_vbr_status(vbr));
339 struct virtio_blk *vblk = req->mq_hctx->queue->queuedata;
341 virtblk_unmap_data(req, vbr);
342 virtblk_cleanup_cmd(req);
344 if (req_op(req) == REQ_OP_ZONE_APPEND)
345 req->__sector = virtio64_to_cpu(vblk->vdev,
346 vbr->in_hdr.zone_append.sector);
348 blk_mq_end_request(req, status);
351 static void virtblk_done(struct virtqueue *vq)
353 struct virtio_blk *vblk = vq->vdev->priv;
354 bool req_done = false;
356 struct virtblk_req *vbr;
360 spin_lock_irqsave(&vblk->vqs[qid].lock, flags);
362 virtqueue_disable_cb(vq);
363 while ((vbr = virtqueue_get_buf(vblk->vqs[qid].vq, &len)) != NULL) {
364 struct request *req = blk_mq_rq_from_pdu(vbr);
366 if (likely(!blk_should_fake_timeout(req->q)))
367 blk_mq_complete_request(req);
370 } while (!virtqueue_enable_cb(vq));
372 /* In case queue is stopped waiting for more buffers. */
374 blk_mq_start_stopped_hw_queues(vblk->disk->queue, true);
375 spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
378 static void virtio_commit_rqs(struct blk_mq_hw_ctx *hctx)
380 struct virtio_blk *vblk = hctx->queue->queuedata;
381 struct virtio_blk_vq *vq = &vblk->vqs[hctx->queue_num];
384 spin_lock_irq(&vq->lock);
385 kick = virtqueue_kick_prepare(vq->vq);
386 spin_unlock_irq(&vq->lock);
389 virtqueue_notify(vq->vq);
392 static blk_status_t virtblk_fail_to_queue(struct request *req, int rc)
394 virtblk_cleanup_cmd(req);
397 return BLK_STS_DEV_RESOURCE;
399 return BLK_STS_RESOURCE;
401 return BLK_STS_IOERR;
405 static blk_status_t virtblk_prep_rq(struct blk_mq_hw_ctx *hctx,
406 struct virtio_blk *vblk,
408 struct virtblk_req *vbr)
413 status = virtblk_setup_cmd(vblk->vdev, req, vbr);
414 if (unlikely(status))
417 num = virtblk_map_data(hctx, req, vbr);
418 if (unlikely(num < 0))
419 return virtblk_fail_to_queue(req, -ENOMEM);
420 vbr->sg_table.nents = num;
422 blk_mq_start_request(req);
427 static blk_status_t virtio_queue_rq(struct blk_mq_hw_ctx *hctx,
428 const struct blk_mq_queue_data *bd)
430 struct virtio_blk *vblk = hctx->queue->queuedata;
431 struct request *req = bd->rq;
432 struct virtblk_req *vbr = blk_mq_rq_to_pdu(req);
434 int qid = hctx->queue_num;
439 status = virtblk_prep_rq(hctx, vblk, req, vbr);
440 if (unlikely(status))
443 spin_lock_irqsave(&vblk->vqs[qid].lock, flags);
444 err = virtblk_add_req(vblk->vqs[qid].vq, vbr);
446 virtqueue_kick(vblk->vqs[qid].vq);
447 /* Don't stop the queue if -ENOMEM: we may have failed to
448 * bounce the buffer due to global resource outage.
451 blk_mq_stop_hw_queue(hctx);
452 spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
453 virtblk_unmap_data(req, vbr);
454 return virtblk_fail_to_queue(req, err);
457 if (bd->last && virtqueue_kick_prepare(vblk->vqs[qid].vq))
459 spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
462 virtqueue_notify(vblk->vqs[qid].vq);
466 static bool virtblk_prep_rq_batch(struct request *req)
468 struct virtio_blk *vblk = req->mq_hctx->queue->queuedata;
469 struct virtblk_req *vbr = blk_mq_rq_to_pdu(req);
471 return virtblk_prep_rq(req->mq_hctx, vblk, req, vbr) == BLK_STS_OK;
474 static bool virtblk_add_req_batch(struct virtio_blk_vq *vq,
475 struct request **rqlist)
481 spin_lock_irqsave(&vq->lock, flags);
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);
487 err = virtblk_add_req(vq->vq, vbr);
489 virtblk_unmap_data(req, vbr);
490 virtblk_cleanup_cmd(req);
491 blk_mq_requeue_request(req, true);
495 kick = virtqueue_kick_prepare(vq->vq);
496 spin_unlock_irqrestore(&vq->lock, flags);
501 static void virtio_queue_rqs(struct request **rqlist)
503 struct request *req, *next, *prev = NULL;
504 struct request *requeue_list = NULL;
506 rq_list_for_each_safe(rqlist, req, next) {
507 struct virtio_blk_vq *vq = get_virtio_blk_vq(req->mq_hctx);
510 if (!virtblk_prep_rq_batch(req)) {
511 rq_list_move(rqlist, &requeue_list, req, prev);
517 if (!next || req->mq_hctx != next->mq_hctx) {
519 kick = virtblk_add_req_batch(vq, rqlist);
521 virtqueue_notify(vq->vq);
529 *rqlist = requeue_list;
532 #ifdef CONFIG_BLK_DEV_ZONED
533 static void *virtblk_alloc_report_buffer(struct virtio_blk *vblk,
534 unsigned int nr_zones,
537 struct request_queue *q = vblk->disk->queue;
541 nr_zones = min_t(unsigned int, nr_zones,
542 get_capacity(vblk->disk) >> ilog2(vblk->zone_sectors));
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);
550 while (bufsize >= sizeof(struct virtio_blk_zone_report)) {
551 buf = __vmalloc(bufsize, GFP_KERNEL | __GFP_NORETRY);
562 static int virtblk_submit_zone_report(struct virtio_blk *vblk,
563 char *report_buf, size_t report_len,
566 struct request_queue *q = vblk->disk->queue;
568 struct virtblk_req *vbr;
571 req = blk_mq_alloc_request(q, REQ_OP_DRV_IN, 0);
575 vbr = blk_mq_rq_to_pdu(req);
576 vbr->in_hdr_len = sizeof(vbr->in_hdr.status);
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);
580 err = blk_rq_map_kern(q, req, report_buf, report_len, GFP_KERNEL);
584 blk_execute_rq(req, false);
585 err = blk_status_to_errno(virtblk_result(vbr->in_hdr.status));
587 blk_mq_free_request(req);
591 static int virtblk_parse_zone(struct virtio_blk *vblk,
592 struct virtio_blk_zone_descriptor *entry,
593 unsigned int idx, report_zones_cb cb, void *data)
595 struct blk_zone zone = { };
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;
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);
605 switch (entry->z_type) {
606 case VIRTIO_BLK_ZT_SWR:
607 zone.type = BLK_ZONE_TYPE_SEQWRITE_REQ;
609 case VIRTIO_BLK_ZT_SWP:
610 zone.type = BLK_ZONE_TYPE_SEQWRITE_PREF;
612 case VIRTIO_BLK_ZT_CONV:
613 zone.type = BLK_ZONE_TYPE_CONVENTIONAL;
616 dev_err(&vblk->vdev->dev, "zone %llu: invalid type %#x\n",
617 zone.start, entry->z_type);
621 switch (entry->z_state) {
622 case VIRTIO_BLK_ZS_EMPTY:
623 zone.cond = BLK_ZONE_COND_EMPTY;
625 case VIRTIO_BLK_ZS_CLOSED:
626 zone.cond = BLK_ZONE_COND_CLOSED;
628 case VIRTIO_BLK_ZS_FULL:
629 zone.cond = BLK_ZONE_COND_FULL;
630 zone.wp = zone.start + zone.len;
632 case VIRTIO_BLK_ZS_EOPEN:
633 zone.cond = BLK_ZONE_COND_EXP_OPEN;
635 case VIRTIO_BLK_ZS_IOPEN:
636 zone.cond = BLK_ZONE_COND_IMP_OPEN;
638 case VIRTIO_BLK_ZS_NOT_WP:
639 zone.cond = BLK_ZONE_COND_NOT_WP;
641 case VIRTIO_BLK_ZS_RDONLY:
642 zone.cond = BLK_ZONE_COND_READONLY;
645 case VIRTIO_BLK_ZS_OFFLINE:
646 zone.cond = BLK_ZONE_COND_OFFLINE;
650 dev_err(&vblk->vdev->dev, "zone %llu: invalid condition %#x\n",
651 zone.start, entry->z_state);
656 * The callback below checks the validity of the reported
657 * entry data, no need to further validate it here.
659 return cb(&zone, idx, data);
662 static int virtblk_report_zones(struct gendisk *disk, sector_t sector,
663 unsigned int nr_zones, report_zones_cb cb,
666 struct virtio_blk *vblk = disk->private_data;
667 struct virtio_blk_zone_report *report;
668 unsigned long long nz, i;
670 unsigned int zone_idx = 0;
673 if (WARN_ON_ONCE(!vblk->zone_sectors))
676 report = virtblk_alloc_report_buffer(vblk, nr_zones, &buflen);
680 mutex_lock(&vblk->vdev_mutex);
687 while (zone_idx < nr_zones && sector < get_capacity(vblk->disk)) {
688 memset(report, 0, buflen);
690 ret = virtblk_submit_zone_report(vblk, (char *)report,
695 nz = min_t(u64, virtio64_to_cpu(vblk->vdev, report->nr_zones),
700 for (i = 0; i < nz && zone_idx < nr_zones; i++) {
701 ret = virtblk_parse_zone(vblk, &report->zones[i],
706 sector = virtio64_to_cpu(vblk->vdev,
707 report->zones[i].z_start) +
718 mutex_unlock(&vblk->vdev_mutex);
723 static int virtblk_read_zoned_limits(struct virtio_blk *vblk,
724 struct queue_limits *lim)
726 struct virtio_device *vdev = vblk->vdev;
729 dev_dbg(&vdev->dev, "probing host-managed zoned device\n");
733 virtio_cread(vdev, struct virtio_blk_config,
734 zoned.max_open_zones, &v);
735 lim->max_open_zones = v;
736 dev_dbg(&vdev->dev, "max open zones = %u\n", v);
738 virtio_cread(vdev, struct virtio_blk_config,
739 zoned.max_active_zones, &v);
740 lim->max_active_zones = v;
741 dev_dbg(&vdev->dev, "max active zones = %u\n", v);
743 virtio_cread(vdev, struct virtio_blk_config,
744 zoned.write_granularity, &wg);
746 dev_warn(&vdev->dev, "zero write granularity reported\n");
749 lim->physical_block_size = wg;
752 dev_dbg(&vdev->dev, "write granularity = %u\n", wg);
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.
758 virtio_cread(vdev, struct virtio_blk_config, zoned.zone_sectors,
759 &vblk->zone_sectors);
760 if (vblk->zone_sectors == 0 || !is_power_of_2(vblk->zone_sectors)) {
762 "zoned device with non power of two zone size %u\n",
766 lim->chunk_sectors = vblk->zone_sectors;
767 dev_dbg(&vdev->dev, "zone sectors = %u\n", vblk->zone_sectors);
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");
772 lim->max_hw_discard_sectors = 0;
775 virtio_cread(vdev, struct virtio_blk_config,
776 zoned.max_append_sectors, &v);
778 dev_warn(&vdev->dev, "zero max_append_sectors reported\n");
781 if ((v << SECTOR_SHIFT) < wg) {
783 "write granularity %u exceeds max_append_sectors %u limit\n",
787 lim->max_zone_append_sectors = v;
788 dev_dbg(&vdev->dev, "max append sectors = %u\n", v);
794 * Zoned block device support is not configured in this kernel, host-managed
795 * zoned devices can't be supported.
797 #define virtblk_report_zones NULL
798 static inline int virtblk_read_zoned_limits(struct virtio_blk *vblk,
799 struct queue_limits *lim)
801 dev_err(&vblk->vdev->dev,
802 "virtio_blk: zoned devices are not supported");
805 #endif /* CONFIG_BLK_DEV_ZONED */
807 /* return id (s/n) string for *disk to *id_str
809 static int virtblk_get_id(struct gendisk *disk, char *id_str)
811 struct virtio_blk *vblk = disk->private_data;
812 struct request_queue *q = vblk->disk->queue;
814 struct virtblk_req *vbr;
817 req = blk_mq_alloc_request(q, REQ_OP_DRV_IN, 0);
821 vbr = blk_mq_rq_to_pdu(req);
822 vbr->in_hdr_len = sizeof(vbr->in_hdr.status);
823 vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_GET_ID);
824 vbr->out_hdr.sector = 0;
826 err = blk_rq_map_kern(q, req, id_str, VIRTIO_BLK_ID_BYTES, GFP_KERNEL);
830 blk_execute_rq(req, false);
831 err = blk_status_to_errno(virtblk_result(vbr->in_hdr.status));
833 blk_mq_free_request(req);
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)
840 struct virtio_blk *vblk = bd->bd_disk->private_data;
843 mutex_lock(&vblk->vdev_mutex);
850 /* see if the host passed in geometry config */
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);
859 /* some standard values, similar to sd */
861 geo->sectors = 1 << 5;
862 geo->cylinders = get_capacity(bd->bd_disk) >> 11;
865 mutex_unlock(&vblk->vdev_mutex);
869 static void virtblk_free_disk(struct gendisk *disk)
871 struct virtio_blk *vblk = disk->private_data;
873 ida_free(&vd_index_ida, vblk->index);
874 mutex_destroy(&vblk->vdev_mutex);
878 static const struct block_device_operations virtblk_fops = {
879 .owner = THIS_MODULE,
880 .getgeo = virtblk_getgeo,
881 .free_disk = virtblk_free_disk,
882 .report_zones = virtblk_report_zones,
885 static int index_to_minor(int index)
887 return index << PART_BITS;
890 static int minor_to_index(int minor)
892 return minor >> PART_BITS;
895 static ssize_t serial_show(struct device *dev,
896 struct device_attribute *attr, char *buf)
898 struct gendisk *disk = dev_to_disk(dev);
901 /* sysfs gives us a PAGE_SIZE buffer */
902 BUILD_BUG_ON(PAGE_SIZE < VIRTIO_BLK_ID_BYTES);
904 buf[VIRTIO_BLK_ID_BYTES] = '\0';
905 err = virtblk_get_id(disk, buf);
909 if (err == -EIO) /* Unsupported? Make it empty. */
915 static DEVICE_ATTR_RO(serial);
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)
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];
923 unsigned long long nblocks;
926 /* Host must always specify the capacity. */
927 virtio_cread(vdev, struct virtio_blk_config, capacity, &capacity);
929 nblocks = DIV_ROUND_UP_ULL(capacity, queue_logical_block_size(q) >> 9);
931 string_get_size(nblocks, queue_logical_block_size(q),
932 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
933 string_get_size(nblocks, queue_logical_block_size(q),
934 STRING_UNITS_10, cap_str_10, sizeof(cap_str_10));
936 dev_notice(&vdev->dev,
937 "[%s] %s%llu %d-byte logical blocks (%s/%s)\n",
938 vblk->disk->disk_name,
939 resize ? "new size: " : "",
941 queue_logical_block_size(q),
945 set_capacity_and_notify(vblk->disk, capacity);
948 static void virtblk_config_changed_work(struct work_struct *work)
950 struct virtio_blk *vblk =
951 container_of(work, struct virtio_blk, config_work);
953 virtblk_update_capacity(vblk, true);
956 static void virtblk_config_changed(struct virtio_device *vdev)
958 struct virtio_blk *vblk = vdev->priv;
960 queue_work(virtblk_wq, &vblk->config_work);
963 static int init_vq(struct virtio_blk *vblk)
967 vq_callback_t **callbacks;
969 struct virtqueue **vqs;
970 unsigned short num_vqs;
971 unsigned short num_poll_vqs;
972 struct virtio_device *vdev = vblk->vdev;
973 struct irq_affinity desc = { 0, };
975 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_MQ,
976 struct virtio_blk_config, num_queues,
981 if (!err && !num_vqs) {
982 dev_err(&vdev->dev, "MQ advertised but zero queues reported\n");
986 num_vqs = min_t(unsigned int,
987 min_not_zero(num_request_queues, nr_cpu_ids),
990 num_poll_vqs = min_t(unsigned int, poll_queues, num_vqs - 1);
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;
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]);
1001 vblk->vqs = kmalloc_array(num_vqs, sizeof(*vblk->vqs), GFP_KERNEL);
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);
1008 if (!names || !callbacks || !vqs) {
1013 for (i = 0; i < num_vqs - num_poll_vqs; i++) {
1014 callbacks[i] = virtblk_done;
1015 snprintf(vblk->vqs[i].name, VQ_NAME_LEN, "req.%u", i);
1016 names[i] = vblk->vqs[i].name;
1019 for (; i < num_vqs; i++) {
1020 callbacks[i] = NULL;
1021 snprintf(vblk->vqs[i].name, VQ_NAME_LEN, "req_poll.%u", i);
1022 names[i] = vblk->vqs[i].name;
1025 /* Discover virtqueues and write information to configuration. */
1026 err = virtio_find_vqs(vdev, num_vqs, vqs, callbacks, names, &desc);
1030 for (i = 0; i < num_vqs; i++) {
1031 spin_lock_init(&vblk->vqs[i].lock);
1032 vblk->vqs[i].vq = vqs[i];
1034 vblk->num_vqs = num_vqs;
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.
1049 static int virtblk_name_format(char *prefix, int index, char *buf, int buflen)
1051 const int base = 'z' - 'a' + 1;
1052 char *begin = buf + strlen(prefix);
1053 char *end = buf + buflen;
1063 *--p = 'a' + (index % unit);
1064 index = (index / unit) - 1;
1065 } while (index >= 0);
1067 memmove(begin, p, end - p);
1068 memcpy(buf, prefix, strlen(prefix));
1073 static int virtblk_get_cache_mode(struct virtio_device *vdev)
1078 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE,
1079 struct virtio_blk_config, wce,
1083 * If WCE is not configurable and flush is not available,
1084 * assume no writeback cache is in use.
1087 writeback = virtio_has_feature(vdev, VIRTIO_BLK_F_FLUSH);
1092 static void virtblk_update_cache_mode(struct virtio_device *vdev)
1094 u8 writeback = virtblk_get_cache_mode(vdev);
1095 struct virtio_blk *vblk = vdev->priv;
1097 blk_queue_write_cache(vblk->disk->queue, writeback, false);
1100 static const char *const virtblk_cache_types[] = {
1101 "write through", "write back"
1105 cache_type_store(struct device *dev, struct device_attribute *attr,
1106 const char *buf, size_t count)
1108 struct gendisk *disk = dev_to_disk(dev);
1109 struct virtio_blk *vblk = disk->private_data;
1110 struct virtio_device *vdev = vblk->vdev;
1113 BUG_ON(!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_CONFIG_WCE));
1114 i = sysfs_match_string(virtblk_cache_types, buf);
1118 virtio_cwrite8(vdev, offsetof(struct virtio_blk_config, wce), i);
1119 virtblk_update_cache_mode(vdev);
1124 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
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);
1130 BUG_ON(writeback >= ARRAY_SIZE(virtblk_cache_types));
1131 return sysfs_emit(buf, "%s\n", virtblk_cache_types[writeback]);
1134 static DEVICE_ATTR_RW(cache_type);
1136 static struct attribute *virtblk_attrs[] = {
1137 &dev_attr_serial.attr,
1138 &dev_attr_cache_type.attr,
1142 static umode_t virtblk_attrs_are_visible(struct kobject *kobj,
1143 struct attribute *a, int n)
1145 struct device *dev = kobj_to_dev(kobj);
1146 struct gendisk *disk = dev_to_disk(dev);
1147 struct virtio_blk *vblk = disk->private_data;
1148 struct virtio_device *vdev = vblk->vdev;
1150 if (a == &dev_attr_cache_type.attr &&
1151 !virtio_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE))
1157 static const struct attribute_group virtblk_attr_group = {
1158 .attrs = virtblk_attrs,
1159 .is_visible = virtblk_attrs_are_visible,
1162 static const struct attribute_group *virtblk_attr_groups[] = {
1163 &virtblk_attr_group,
1167 static void virtblk_map_queues(struct blk_mq_tag_set *set)
1169 struct virtio_blk *vblk = set->driver_data;
1172 for (i = 0, qoff = 0; i < set->nr_maps; i++) {
1173 struct blk_mq_queue_map *map = &set->map[i];
1175 map->nr_queues = vblk->io_queues[i];
1176 map->queue_offset = qoff;
1177 qoff += map->nr_queues;
1179 if (map->nr_queues == 0)
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.
1187 if (i == HCTX_TYPE_POLL)
1188 blk_mq_map_queues(&set->map[i]);
1190 blk_mq_virtio_map_queues(&set->map[i], vblk->vdev, 0);
1194 static void virtblk_complete_batch(struct io_comp_batch *iob)
1196 struct request *req;
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);
1202 blk_mq_end_request_batch(iob);
1205 static int virtblk_poll(struct blk_mq_hw_ctx *hctx, struct io_comp_batch *iob)
1207 struct virtio_blk *vblk = hctx->queue->queuedata;
1208 struct virtio_blk_vq *vq = get_virtio_blk_vq(hctx);
1209 struct virtblk_req *vbr;
1210 unsigned long flags;
1214 spin_lock_irqsave(&vq->lock, flags);
1216 while ((vbr = virtqueue_get_buf(vq->vq, &len)) != NULL) {
1217 struct request *req = blk_mq_rq_from_pdu(vbr);
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);
1227 blk_mq_start_stopped_hw_queues(vblk->disk->queue, true);
1229 spin_unlock_irqrestore(&vq->lock, flags);
1234 static const struct blk_mq_ops virtio_mq_ops = {
1235 .queue_rq = virtio_queue_rq,
1236 .queue_rqs = virtio_queue_rqs,
1237 .commit_rqs = virtio_commit_rqs,
1238 .complete = virtblk_request_done,
1239 .map_queues = virtblk_map_queues,
1240 .poll = virtblk_poll,
1243 static unsigned int virtblk_queue_depth;
1244 module_param_named(queue_depth, virtblk_queue_depth, uint, 0444);
1246 static int virtblk_read_limits(struct virtio_blk *vblk,
1247 struct queue_limits *lim)
1249 struct virtio_device *vdev = vblk->vdev;
1250 u32 v, blk_size, max_size, sg_elems, opt_io_size;
1251 u32 max_discard_segs = 0;
1252 u32 discard_granularity = 0;
1254 u8 physical_block_exp, alignment_offset;
1255 size_t max_dma_size;
1258 /* We need to know how many segments before we allocate. */
1259 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SEG_MAX,
1260 struct virtio_blk_config, seg_max,
1263 /* We need at least one SG element, whatever they say. */
1264 if (err || !sg_elems)
1267 /* Prevent integer overflows and honor max vq size */
1268 sg_elems = min_t(u32, sg_elems, VIRTIO_BLK_MAX_SG_ELEMS - 2);
1270 /* We can handle whatever the host told us to handle. */
1271 lim->max_segments = sg_elems;
1273 /* No real sector limit. */
1274 lim->max_hw_sectors = UINT_MAX;
1276 max_dma_size = virtio_max_dma_size(vdev);
1277 max_size = max_dma_size > U32_MAX ? U32_MAX : max_dma_size;
1279 /* Host can optionally specify maximum segment size and number of
1281 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SIZE_MAX,
1282 struct virtio_blk_config, size_max, &v);
1284 max_size = min(max_size, v);
1286 lim->max_segment_size = max_size;
1288 /* Host can optionally specify the block size of the device */
1289 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_BLK_SIZE,
1290 struct virtio_blk_config, blk_size,
1293 err = blk_validate_block_size(blk_size);
1296 "virtio_blk: invalid block size: 0x%x\n",
1301 lim->logical_block_size = blk_size;
1303 blk_size = lim->logical_block_size;
1305 /* Use topology information if available */
1306 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
1307 struct virtio_blk_config, physical_block_exp,
1308 &physical_block_exp);
1309 if (!err && physical_block_exp)
1310 lim->physical_block_size = blk_size * (1 << physical_block_exp);
1312 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
1313 struct virtio_blk_config, alignment_offset,
1315 if (!err && alignment_offset)
1316 lim->alignment_offset = blk_size * alignment_offset;
1318 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
1319 struct virtio_blk_config, min_io_size,
1321 if (!err && min_io_size)
1322 lim->io_min = blk_size * min_io_size;
1324 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
1325 struct virtio_blk_config, opt_io_size,
1327 if (!err && opt_io_size)
1328 lim->io_opt = blk_size * opt_io_size;
1330 if (virtio_has_feature(vdev, VIRTIO_BLK_F_DISCARD)) {
1331 virtio_cread(vdev, struct virtio_blk_config,
1332 discard_sector_alignment, &discard_granularity);
1334 virtio_cread(vdev, struct virtio_blk_config,
1335 max_discard_sectors, &v);
1336 lim->max_hw_discard_sectors = v ? v : UINT_MAX;
1338 virtio_cread(vdev, struct virtio_blk_config, max_discard_seg,
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);
1345 lim->max_write_zeroes_sectors = v ? v : UINT_MAX;
1348 /* The discard and secure erase limits are combined since the Linux
1349 * block layer uses the same limit for both commands.
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.
1354 * discard sector alignment is set to the minimum between discard_sector_alignment
1355 * and secure_erase_sector_alignment.
1357 * max discard sectors is set to the minimum between max_discard_seg and
1358 * max_secure_erase_seg.
1360 if (virtio_has_feature(vdev, VIRTIO_BLK_F_SECURE_ERASE)) {
1362 virtio_cread(vdev, struct virtio_blk_config,
1363 secure_erase_sector_alignment, &v);
1365 /* secure_erase_sector_alignment should not be zero, the device should set a
1366 * valid number of sectors.
1370 "virtio_blk: secure_erase_sector_alignment can't be 0\n");
1374 discard_granularity = min_not_zero(discard_granularity, v);
1376 virtio_cread(vdev, struct virtio_blk_config,
1377 max_secure_erase_sectors, &v);
1379 /* max_secure_erase_sectors should not be zero, the device should set a
1380 * valid number of sectors.
1384 "virtio_blk: max_secure_erase_sectors can't be 0\n");
1388 lim->max_secure_erase_sectors = v;
1390 virtio_cread(vdev, struct virtio_blk_config,
1391 max_secure_erase_seg, &v);
1393 /* max_secure_erase_seg should not be zero, the device should set a
1394 * valid number of segments
1398 "virtio_blk: max_secure_erase_seg can't be 0\n");
1402 max_discard_segs = min_not_zero(max_discard_segs, v);
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.
1412 if (!max_discard_segs)
1413 max_discard_segs = sg_elems;
1415 lim->max_discard_segments =
1416 min(max_discard_segs, MAX_DISCARD_SEGMENTS);
1418 if (discard_granularity)
1419 lim->discard_granularity =
1420 discard_granularity << SECTOR_SHIFT;
1422 lim->discard_granularity = blk_size;
1425 if (virtio_has_feature(vdev, VIRTIO_BLK_F_ZONED)) {
1428 virtio_cread(vdev, struct virtio_blk_config, zoned.model, &model);
1430 case VIRTIO_BLK_Z_NONE:
1431 case VIRTIO_BLK_Z_HA:
1432 /* treat host-aware devices as non-zoned */
1434 case VIRTIO_BLK_Z_HM:
1435 err = virtblk_read_zoned_limits(vblk, lim);
1440 dev_err(&vdev->dev, "unsupported zone model %d\n", model);
1448 static int virtblk_probe(struct virtio_device *vdev)
1450 struct virtio_blk *vblk;
1451 struct queue_limits lim = { };
1453 unsigned int queue_depth;
1455 if (!vdev->config->get) {
1456 dev_err(&vdev->dev, "%s failure: config access disabled\n",
1461 err = ida_alloc_range(&vd_index_ida, 0,
1462 minor_to_index(1 << MINORBITS) - 1, GFP_KERNEL);
1467 vdev->priv = vblk = kmalloc(sizeof(*vblk), GFP_KERNEL);
1470 goto out_free_index;
1473 mutex_init(&vblk->vdev_mutex);
1477 INIT_WORK(&vblk->config_work, virtblk_config_changed_work);
1479 err = init_vq(vblk);
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))
1490 queue_depth = virtblk_queue_depth;
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;
1507 err = blk_mq_alloc_tag_set(&vblk->tag_set);
1511 err = virtblk_read_limits(vblk, &lim);
1515 vblk->disk = blk_mq_alloc_disk(&vblk->tag_set, &lim, vblk);
1516 if (IS_ERR(vblk->disk)) {
1517 err = PTR_ERR(vblk->disk);
1521 virtblk_name_format("vd", index, vblk->disk->disk_name, DISK_NAME_LEN);
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;
1530 /* configure queue flush support */
1531 virtblk_update_cache_mode(vdev);
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);
1537 virtblk_update_capacity(vblk, false);
1538 virtio_device_ready(vdev);
1541 * All steps that follow use the VQs therefore they need to be
1542 * placed after the virtio_device_ready() call above.
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);
1548 goto out_cleanup_disk;
1551 err = device_add_disk(&vdev->dev, vblk->disk, virtblk_attr_groups);
1553 goto out_cleanup_disk;
1558 put_disk(vblk->disk);
1560 blk_mq_free_tag_set(&vblk->tag_set);
1562 vdev->config->del_vqs(vdev);
1567 ida_free(&vd_index_ida, index);
1572 static void virtblk_remove(struct virtio_device *vdev)
1574 struct virtio_blk *vblk = vdev->priv;
1576 /* Make sure no work handler is accessing the device. */
1577 flush_work(&vblk->config_work);
1579 del_gendisk(vblk->disk);
1580 blk_mq_free_tag_set(&vblk->tag_set);
1582 mutex_lock(&vblk->vdev_mutex);
1584 /* Stop all the virtqueues. */
1585 virtio_reset_device(vdev);
1587 /* Virtqueues are stopped, nothing can use vblk->vdev anymore. */
1590 vdev->config->del_vqs(vdev);
1593 mutex_unlock(&vblk->vdev_mutex);
1595 put_disk(vblk->disk);
1598 #ifdef CONFIG_PM_SLEEP
1599 static int virtblk_freeze(struct virtio_device *vdev)
1601 struct virtio_blk *vblk = vdev->priv;
1603 /* Ensure no requests in virtqueues before deleting vqs. */
1604 blk_mq_freeze_queue(vblk->disk->queue);
1606 /* Ensure we don't receive any more interrupts */
1607 virtio_reset_device(vdev);
1609 /* Make sure no work handler is accessing the device. */
1610 flush_work(&vblk->config_work);
1612 vdev->config->del_vqs(vdev);
1618 static int virtblk_restore(struct virtio_device *vdev)
1620 struct virtio_blk *vblk = vdev->priv;
1623 ret = init_vq(vdev->priv);
1627 virtio_device_ready(vdev);
1629 blk_mq_unfreeze_queue(vblk->disk->queue);
1634 static const struct virtio_device_id id_table[] = {
1635 { VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID },
1639 static unsigned int features_legacy[] = {
1640 VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY,
1641 VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE,
1642 VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE,
1643 VIRTIO_BLK_F_MQ, VIRTIO_BLK_F_DISCARD, VIRTIO_BLK_F_WRITE_ZEROES,
1644 VIRTIO_BLK_F_SECURE_ERASE,
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,
1650 VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE,
1651 VIRTIO_BLK_F_MQ, VIRTIO_BLK_F_DISCARD, VIRTIO_BLK_F_WRITE_ZEROES,
1652 VIRTIO_BLK_F_SECURE_ERASE, VIRTIO_BLK_F_ZONED,
1655 static struct virtio_driver virtio_blk = {
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 .id_table = id_table,
1662 .probe = virtblk_probe,
1663 .remove = virtblk_remove,
1664 .config_changed = virtblk_config_changed,
1665 #ifdef CONFIG_PM_SLEEP
1666 .freeze = virtblk_freeze,
1667 .restore = virtblk_restore,
1671 static int __init virtio_blk_init(void)
1675 virtblk_wq = alloc_workqueue("virtio-blk", 0, 0);
1679 major = register_blkdev(0, "virtblk");
1682 goto out_destroy_workqueue;
1685 error = register_virtio_driver(&virtio_blk);
1687 goto out_unregister_blkdev;
1690 out_unregister_blkdev:
1691 unregister_blkdev(major, "virtblk");
1692 out_destroy_workqueue:
1693 destroy_workqueue(virtblk_wq);
1697 static void __exit virtio_blk_fini(void)
1699 unregister_virtio_driver(&virtio_blk);
1700 unregister_blkdev(major, "virtblk");
1701 destroy_workqueue(virtblk_wq);
1703 module_init(virtio_blk_init);
1704 module_exit(virtio_blk_fini);
1706 MODULE_DEVICE_TABLE(virtio, id_table);
1707 MODULE_DESCRIPTION("Virtio block driver");
1708 MODULE_LICENSE("GPL");