2 #include <linux/spinlock.h>
3 #include <linux/slab.h>
4 #include <linux/blkdev.h>
5 #include <linux/hdreg.h>
6 #include <linux/module.h>
7 #include <linux/mutex.h>
8 #include <linux/interrupt.h>
9 #include <linux/virtio.h>
10 #include <linux/virtio_blk.h>
11 #include <linux/scatterlist.h>
12 #include <linux/string_helpers.h>
13 #include <scsi/scsi_cmnd.h>
14 #include <linux/idr.h>
15 #include <linux/blk-mq.h>
16 #include <linux/blk-mq-virtio.h>
17 #include <linux/numa.h>
20 #define VQ_NAME_LEN 16
23 static DEFINE_IDA(vd_index_ida);
25 static struct workqueue_struct *virtblk_wq;
27 struct virtio_blk_vq {
30 char name[VQ_NAME_LEN];
31 } ____cacheline_aligned_in_smp;
34 struct virtio_device *vdev;
36 /* The disk structure for the kernel. */
39 /* Block layer tags. */
40 struct blk_mq_tag_set tag_set;
42 /* Process context for config space updates */
43 struct work_struct config_work;
45 /* What host tells us, plus 2 for header & tailer. */
46 unsigned int sg_elems;
48 /* Ida index - used to track minor number allocations. */
53 struct virtio_blk_vq *vqs;
57 #ifdef CONFIG_VIRTIO_BLK_SCSI
58 struct scsi_request sreq; /* for SCSI passthrough, must be first */
59 u8 sense[SCSI_SENSE_BUFFERSIZE];
60 struct virtio_scsi_inhdr in_hdr;
62 struct virtio_blk_outhdr out_hdr;
64 struct scatterlist sg[];
67 static inline int virtblk_result(struct virtblk_req *vbr)
69 switch (vbr->status) {
72 case VIRTIO_BLK_S_UNSUPP:
80 * If this is a packet command we need a couple of additional headers. Behind
81 * the normal outhdr we put a segment with the scsi command block, and before
82 * the normal inhdr we put the sense data and the inhdr with additional status
85 #ifdef CONFIG_VIRTIO_BLK_SCSI
86 static int virtblk_add_req_scsi(struct virtqueue *vq, struct virtblk_req *vbr,
87 struct scatterlist *data_sg, bool have_data)
89 struct scatterlist hdr, status, cmd, sense, inhdr, *sgs[6];
90 unsigned int num_out = 0, num_in = 0;
92 sg_init_one(&hdr, &vbr->out_hdr, sizeof(vbr->out_hdr));
93 sgs[num_out++] = &hdr;
94 sg_init_one(&cmd, vbr->sreq.cmd, vbr->sreq.cmd_len);
95 sgs[num_out++] = &cmd;
98 if (vbr->out_hdr.type & cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_OUT))
99 sgs[num_out++] = data_sg;
101 sgs[num_out + num_in++] = data_sg;
104 sg_init_one(&sense, vbr->sense, SCSI_SENSE_BUFFERSIZE);
105 sgs[num_out + num_in++] = &sense;
106 sg_init_one(&inhdr, &vbr->in_hdr, sizeof(vbr->in_hdr));
107 sgs[num_out + num_in++] = &inhdr;
108 sg_init_one(&status, &vbr->status, sizeof(vbr->status));
109 sgs[num_out + num_in++] = &status;
111 return virtqueue_add_sgs(vq, sgs, num_out, num_in, vbr, GFP_ATOMIC);
114 static inline void virtblk_scsi_request_done(struct request *req)
116 struct virtblk_req *vbr = blk_mq_rq_to_pdu(req);
117 struct virtio_blk *vblk = req->q->queuedata;
118 struct scsi_request *sreq = &vbr->sreq;
120 sreq->resid_len = virtio32_to_cpu(vblk->vdev, vbr->in_hdr.residual);
121 sreq->sense_len = virtio32_to_cpu(vblk->vdev, vbr->in_hdr.sense_len);
122 req->errors = virtio32_to_cpu(vblk->vdev, vbr->in_hdr.errors);
125 static int virtblk_ioctl(struct block_device *bdev, fmode_t mode,
126 unsigned int cmd, unsigned long data)
128 struct gendisk *disk = bdev->bd_disk;
129 struct virtio_blk *vblk = disk->private_data;
132 * Only allow the generic SCSI ioctls if the host can support it.
134 if (!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_SCSI))
137 return scsi_cmd_blk_ioctl(bdev, mode, cmd,
138 (void __user *)data);
141 static inline int virtblk_add_req_scsi(struct virtqueue *vq,
142 struct virtblk_req *vbr, struct scatterlist *data_sg,
147 static inline void virtblk_scsi_request_done(struct request *req)
150 #define virtblk_ioctl NULL
151 #endif /* CONFIG_VIRTIO_BLK_SCSI */
153 static int virtblk_add_req(struct virtqueue *vq, struct virtblk_req *vbr,
154 struct scatterlist *data_sg, bool have_data)
156 struct scatterlist hdr, status, *sgs[3];
157 unsigned int num_out = 0, num_in = 0;
159 sg_init_one(&hdr, &vbr->out_hdr, sizeof(vbr->out_hdr));
160 sgs[num_out++] = &hdr;
163 if (vbr->out_hdr.type & cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_OUT))
164 sgs[num_out++] = data_sg;
166 sgs[num_out + num_in++] = data_sg;
169 sg_init_one(&status, &vbr->status, sizeof(vbr->status));
170 sgs[num_out + num_in++] = &status;
172 return virtqueue_add_sgs(vq, sgs, num_out, num_in, vbr, GFP_ATOMIC);
175 static inline void virtblk_request_done(struct request *req)
177 struct virtblk_req *vbr = blk_mq_rq_to_pdu(req);
179 switch (req_op(req)) {
181 case REQ_OP_SCSI_OUT:
182 virtblk_scsi_request_done(req);
186 blk_mq_end_request(req, virtblk_result(vbr));
189 static void virtblk_done(struct virtqueue *vq)
191 struct virtio_blk *vblk = vq->vdev->priv;
192 bool req_done = false;
194 struct virtblk_req *vbr;
198 spin_lock_irqsave(&vblk->vqs[qid].lock, flags);
200 virtqueue_disable_cb(vq);
201 while ((vbr = virtqueue_get_buf(vblk->vqs[qid].vq, &len)) != NULL) {
202 struct request *req = blk_mq_rq_from_pdu(vbr);
204 blk_mq_complete_request(req, 0);
207 if (unlikely(virtqueue_is_broken(vq)))
209 } while (!virtqueue_enable_cb(vq));
211 /* In case queue is stopped waiting for more buffers. */
213 blk_mq_start_stopped_hw_queues(vblk->disk->queue, true);
214 spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
217 static int virtio_queue_rq(struct blk_mq_hw_ctx *hctx,
218 const struct blk_mq_queue_data *bd)
220 struct virtio_blk *vblk = hctx->queue->queuedata;
221 struct request *req = bd->rq;
222 struct virtblk_req *vbr = blk_mq_rq_to_pdu(req);
225 int qid = hctx->queue_num;
230 BUG_ON(req->nr_phys_segments + 2 > vblk->sg_elems);
232 switch (req_op(req)) {
238 type = VIRTIO_BLK_T_FLUSH;
241 case REQ_OP_SCSI_OUT:
242 type = VIRTIO_BLK_T_SCSI_CMD;
245 type = VIRTIO_BLK_T_GET_ID;
249 return BLK_MQ_RQ_QUEUE_ERROR;
252 vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, type);
253 vbr->out_hdr.sector = type ?
254 0 : cpu_to_virtio64(vblk->vdev, blk_rq_pos(req));
255 vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(req));
257 blk_mq_start_request(req);
259 num = blk_rq_map_sg(hctx->queue, req, vbr->sg);
261 if (rq_data_dir(req) == WRITE)
262 vbr->out_hdr.type |= cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_OUT);
264 vbr->out_hdr.type |= cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_IN);
267 spin_lock_irqsave(&vblk->vqs[qid].lock, flags);
268 if (req_op(req) == REQ_OP_SCSI_IN || req_op(req) == REQ_OP_SCSI_OUT)
269 err = virtblk_add_req_scsi(vblk->vqs[qid].vq, vbr, vbr->sg, num);
271 err = virtblk_add_req(vblk->vqs[qid].vq, vbr, vbr->sg, num);
273 virtqueue_kick(vblk->vqs[qid].vq);
274 blk_mq_stop_hw_queue(hctx);
275 spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
276 /* Out of mem doesn't actually happen, since we fall back
277 * to direct descriptors */
278 if (err == -ENOMEM || err == -ENOSPC)
279 return BLK_MQ_RQ_QUEUE_BUSY;
280 return BLK_MQ_RQ_QUEUE_ERROR;
283 if (bd->last && virtqueue_kick_prepare(vblk->vqs[qid].vq))
285 spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
288 virtqueue_notify(vblk->vqs[qid].vq);
289 return BLK_MQ_RQ_QUEUE_OK;
292 /* return id (s/n) string for *disk to *id_str
294 static int virtblk_get_id(struct gendisk *disk, char *id_str)
296 struct virtio_blk *vblk = disk->private_data;
297 struct request_queue *q = vblk->disk->queue;
301 req = blk_get_request(q, REQ_OP_DRV_IN, GFP_KERNEL);
305 err = blk_rq_map_kern(q, req, id_str, VIRTIO_BLK_ID_BYTES, GFP_KERNEL);
309 blk_execute_rq(vblk->disk->queue, vblk->disk, req, false);
310 err = virtblk_result(blk_mq_rq_to_pdu(req));
312 blk_put_request(req);
316 /* We provide getgeo only to please some old bootloader/partitioning tools */
317 static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
319 struct virtio_blk *vblk = bd->bd_disk->private_data;
321 /* see if the host passed in geometry config */
322 if (virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_GEOMETRY)) {
323 virtio_cread(vblk->vdev, struct virtio_blk_config,
324 geometry.cylinders, &geo->cylinders);
325 virtio_cread(vblk->vdev, struct virtio_blk_config,
326 geometry.heads, &geo->heads);
327 virtio_cread(vblk->vdev, struct virtio_blk_config,
328 geometry.sectors, &geo->sectors);
330 /* some standard values, similar to sd */
332 geo->sectors = 1 << 5;
333 geo->cylinders = get_capacity(bd->bd_disk) >> 11;
338 static const struct block_device_operations virtblk_fops = {
339 .ioctl = virtblk_ioctl,
340 .owner = THIS_MODULE,
341 .getgeo = virtblk_getgeo,
344 static int index_to_minor(int index)
346 return index << PART_BITS;
349 static int minor_to_index(int minor)
351 return minor >> PART_BITS;
354 static ssize_t virtblk_serial_show(struct device *dev,
355 struct device_attribute *attr, char *buf)
357 struct gendisk *disk = dev_to_disk(dev);
360 /* sysfs gives us a PAGE_SIZE buffer */
361 BUILD_BUG_ON(PAGE_SIZE < VIRTIO_BLK_ID_BYTES);
363 buf[VIRTIO_BLK_ID_BYTES] = '\0';
364 err = virtblk_get_id(disk, buf);
368 if (err == -EIO) /* Unsupported? Make it empty. */
374 static DEVICE_ATTR(serial, S_IRUGO, virtblk_serial_show, NULL);
376 static void virtblk_config_changed_work(struct work_struct *work)
378 struct virtio_blk *vblk =
379 container_of(work, struct virtio_blk, config_work);
380 struct virtio_device *vdev = vblk->vdev;
381 struct request_queue *q = vblk->disk->queue;
382 char cap_str_2[10], cap_str_10[10];
383 char *envp[] = { "RESIZE=1", NULL };
386 /* Host must always specify the capacity. */
387 virtio_cread(vdev, struct virtio_blk_config, capacity, &capacity);
389 /* If capacity is too big, truncate with warning. */
390 if ((sector_t)capacity != capacity) {
391 dev_warn(&vdev->dev, "Capacity %llu too large: truncating\n",
392 (unsigned long long)capacity);
393 capacity = (sector_t)-1;
396 string_get_size(capacity, queue_logical_block_size(q),
397 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
398 string_get_size(capacity, queue_logical_block_size(q),
399 STRING_UNITS_10, cap_str_10, sizeof(cap_str_10));
401 dev_notice(&vdev->dev,
402 "new size: %llu %d-byte logical blocks (%s/%s)\n",
403 (unsigned long long)capacity,
404 queue_logical_block_size(q),
405 cap_str_10, cap_str_2);
407 set_capacity(vblk->disk, capacity);
408 revalidate_disk(vblk->disk);
409 kobject_uevent_env(&disk_to_dev(vblk->disk)->kobj, KOBJ_CHANGE, envp);
412 static void virtblk_config_changed(struct virtio_device *vdev)
414 struct virtio_blk *vblk = vdev->priv;
416 queue_work(virtblk_wq, &vblk->config_work);
419 static int init_vq(struct virtio_blk *vblk)
423 vq_callback_t **callbacks;
425 struct virtqueue **vqs;
426 unsigned short num_vqs;
427 struct virtio_device *vdev = vblk->vdev;
428 struct irq_affinity desc = { 0, };
430 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_MQ,
431 struct virtio_blk_config, num_queues,
436 vblk->vqs = kmalloc_array(num_vqs, sizeof(*vblk->vqs), GFP_KERNEL);
440 names = kmalloc_array(num_vqs, sizeof(*names), GFP_KERNEL);
441 callbacks = kmalloc_array(num_vqs, sizeof(*callbacks), GFP_KERNEL);
442 vqs = kmalloc_array(num_vqs, sizeof(*vqs), GFP_KERNEL);
443 if (!names || !callbacks || !vqs) {
448 for (i = 0; i < num_vqs; i++) {
449 callbacks[i] = virtblk_done;
450 snprintf(vblk->vqs[i].name, VQ_NAME_LEN, "req.%d", i);
451 names[i] = vblk->vqs[i].name;
454 /* Discover virtqueues and write information to configuration. */
455 err = vdev->config->find_vqs(vdev, num_vqs, vqs, callbacks, names,
460 for (i = 0; i < num_vqs; i++) {
461 spin_lock_init(&vblk->vqs[i].lock);
462 vblk->vqs[i].vq = vqs[i];
464 vblk->num_vqs = num_vqs;
476 * Legacy naming scheme used for virtio devices. We are stuck with it for
477 * virtio blk but don't ever use it for any new driver.
479 static int virtblk_name_format(char *prefix, int index, char *buf, int buflen)
481 const int base = 'z' - 'a' + 1;
482 char *begin = buf + strlen(prefix);
483 char *end = buf + buflen;
493 *--p = 'a' + (index % unit);
494 index = (index / unit) - 1;
495 } while (index >= 0);
497 memmove(begin, p, end - p);
498 memcpy(buf, prefix, strlen(prefix));
503 static int virtblk_get_cache_mode(struct virtio_device *vdev)
508 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE,
509 struct virtio_blk_config, wce,
513 * If WCE is not configurable and flush is not available,
514 * assume no writeback cache is in use.
517 writeback = virtio_has_feature(vdev, VIRTIO_BLK_F_FLUSH);
522 static void virtblk_update_cache_mode(struct virtio_device *vdev)
524 u8 writeback = virtblk_get_cache_mode(vdev);
525 struct virtio_blk *vblk = vdev->priv;
527 blk_queue_write_cache(vblk->disk->queue, writeback, false);
528 revalidate_disk(vblk->disk);
531 static const char *const virtblk_cache_types[] = {
532 "write through", "write back"
536 virtblk_cache_type_store(struct device *dev, struct device_attribute *attr,
537 const char *buf, size_t count)
539 struct gendisk *disk = dev_to_disk(dev);
540 struct virtio_blk *vblk = disk->private_data;
541 struct virtio_device *vdev = vblk->vdev;
544 BUG_ON(!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_CONFIG_WCE));
545 for (i = ARRAY_SIZE(virtblk_cache_types); --i >= 0; )
546 if (sysfs_streq(buf, virtblk_cache_types[i]))
552 virtio_cwrite8(vdev, offsetof(struct virtio_blk_config, wce), i);
553 virtblk_update_cache_mode(vdev);
558 virtblk_cache_type_show(struct device *dev, struct device_attribute *attr,
561 struct gendisk *disk = dev_to_disk(dev);
562 struct virtio_blk *vblk = disk->private_data;
563 u8 writeback = virtblk_get_cache_mode(vblk->vdev);
565 BUG_ON(writeback >= ARRAY_SIZE(virtblk_cache_types));
566 return snprintf(buf, 40, "%s\n", virtblk_cache_types[writeback]);
569 static const struct device_attribute dev_attr_cache_type_ro =
570 __ATTR(cache_type, S_IRUGO,
571 virtblk_cache_type_show, NULL);
572 static const struct device_attribute dev_attr_cache_type_rw =
573 __ATTR(cache_type, S_IRUGO|S_IWUSR,
574 virtblk_cache_type_show, virtblk_cache_type_store);
576 static int virtblk_init_request(void *data, struct request *rq,
577 unsigned int hctx_idx, unsigned int request_idx,
578 unsigned int numa_node)
580 struct virtio_blk *vblk = data;
581 struct virtblk_req *vbr = blk_mq_rq_to_pdu(rq);
583 #ifdef CONFIG_VIRTIO_BLK_SCSI
584 vbr->sreq.sense = vbr->sense;
586 sg_init_table(vbr->sg, vblk->sg_elems);
590 static int virtblk_map_queues(struct blk_mq_tag_set *set)
592 struct virtio_blk *vblk = set->driver_data;
594 return blk_mq_virtio_map_queues(set, vblk->vdev, 0);
597 static const struct blk_mq_ops virtio_mq_ops = {
598 .queue_rq = virtio_queue_rq,
599 .complete = virtblk_request_done,
600 .init_request = virtblk_init_request,
601 .map_queues = virtblk_map_queues,
604 static unsigned int virtblk_queue_depth;
605 module_param_named(queue_depth, virtblk_queue_depth, uint, 0444);
607 static int virtblk_probe(struct virtio_device *vdev)
609 struct virtio_blk *vblk;
610 struct request_queue *q;
614 u32 v, blk_size, sg_elems, opt_io_size;
616 u8 physical_block_exp, alignment_offset;
618 if (!vdev->config->get) {
619 dev_err(&vdev->dev, "%s failure: config access disabled\n",
624 err = ida_simple_get(&vd_index_ida, 0, minor_to_index(1 << MINORBITS),
630 /* We need to know how many segments before we allocate. */
631 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SEG_MAX,
632 struct virtio_blk_config, seg_max,
635 /* We need at least one SG element, whatever they say. */
636 if (err || !sg_elems)
639 /* We need an extra sg elements at head and tail. */
641 vdev->priv = vblk = kmalloc(sizeof(*vblk), GFP_KERNEL);
648 vblk->sg_elems = sg_elems;
650 INIT_WORK(&vblk->config_work, virtblk_config_changed_work);
656 /* FIXME: How many partitions? How long is a piece of string? */
657 vblk->disk = alloc_disk(1 << PART_BITS);
663 /* Default queue sizing is to fill the ring. */
664 if (!virtblk_queue_depth) {
665 virtblk_queue_depth = vblk->vqs[0].vq->num_free;
666 /* ... but without indirect descs, we use 2 descs per req */
667 if (!virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC))
668 virtblk_queue_depth /= 2;
671 memset(&vblk->tag_set, 0, sizeof(vblk->tag_set));
672 vblk->tag_set.ops = &virtio_mq_ops;
673 vblk->tag_set.queue_depth = virtblk_queue_depth;
674 vblk->tag_set.numa_node = NUMA_NO_NODE;
675 vblk->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
676 vblk->tag_set.cmd_size =
677 sizeof(struct virtblk_req) +
678 sizeof(struct scatterlist) * sg_elems;
679 vblk->tag_set.driver_data = vblk;
680 vblk->tag_set.nr_hw_queues = vblk->num_vqs;
682 err = blk_mq_alloc_tag_set(&vblk->tag_set);
686 q = blk_mq_init_queue(&vblk->tag_set);
691 vblk->disk->queue = q;
695 virtblk_name_format("vd", index, vblk->disk->disk_name, DISK_NAME_LEN);
697 vblk->disk->major = major;
698 vblk->disk->first_minor = index_to_minor(index);
699 vblk->disk->private_data = vblk;
700 vblk->disk->fops = &virtblk_fops;
701 vblk->disk->flags |= GENHD_FL_EXT_DEVT;
704 /* configure queue flush support */
705 virtblk_update_cache_mode(vdev);
707 /* If disk is read-only in the host, the guest should obey */
708 if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO))
709 set_disk_ro(vblk->disk, 1);
711 /* Host must always specify the capacity. */
712 virtio_cread(vdev, struct virtio_blk_config, capacity, &cap);
714 /* If capacity is too big, truncate with warning. */
715 if ((sector_t)cap != cap) {
716 dev_warn(&vdev->dev, "Capacity %llu too large: truncating\n",
717 (unsigned long long)cap);
720 set_capacity(vblk->disk, cap);
722 /* We can handle whatever the host told us to handle. */
723 blk_queue_max_segments(q, vblk->sg_elems-2);
725 /* No need to bounce any requests */
726 blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
728 /* No real sector limit. */
729 blk_queue_max_hw_sectors(q, -1U);
731 /* Host can optionally specify maximum segment size and number of
733 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SIZE_MAX,
734 struct virtio_blk_config, size_max, &v);
736 blk_queue_max_segment_size(q, v);
738 blk_queue_max_segment_size(q, -1U);
740 /* Host can optionally specify the block size of the device */
741 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_BLK_SIZE,
742 struct virtio_blk_config, blk_size,
745 blk_queue_logical_block_size(q, blk_size);
747 blk_size = queue_logical_block_size(q);
749 /* Use topology information if available */
750 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
751 struct virtio_blk_config, physical_block_exp,
752 &physical_block_exp);
753 if (!err && physical_block_exp)
754 blk_queue_physical_block_size(q,
755 blk_size * (1 << physical_block_exp));
757 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
758 struct virtio_blk_config, alignment_offset,
760 if (!err && alignment_offset)
761 blk_queue_alignment_offset(q, blk_size * alignment_offset);
763 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
764 struct virtio_blk_config, min_io_size,
766 if (!err && min_io_size)
767 blk_queue_io_min(q, blk_size * min_io_size);
769 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
770 struct virtio_blk_config, opt_io_size,
772 if (!err && opt_io_size)
773 blk_queue_io_opt(q, blk_size * opt_io_size);
775 virtio_device_ready(vdev);
777 device_add_disk(&vdev->dev, vblk->disk);
778 err = device_create_file(disk_to_dev(vblk->disk), &dev_attr_serial);
782 if (virtio_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE))
783 err = device_create_file(disk_to_dev(vblk->disk),
784 &dev_attr_cache_type_rw);
786 err = device_create_file(disk_to_dev(vblk->disk),
787 &dev_attr_cache_type_ro);
793 del_gendisk(vblk->disk);
794 blk_cleanup_queue(vblk->disk->queue);
796 blk_mq_free_tag_set(&vblk->tag_set);
798 put_disk(vblk->disk);
800 vdev->config->del_vqs(vdev);
804 ida_simple_remove(&vd_index_ida, index);
809 static void virtblk_remove(struct virtio_device *vdev)
811 struct virtio_blk *vblk = vdev->priv;
812 int index = vblk->index;
815 /* Make sure no work handler is accessing the device. */
816 flush_work(&vblk->config_work);
818 del_gendisk(vblk->disk);
819 blk_cleanup_queue(vblk->disk->queue);
821 blk_mq_free_tag_set(&vblk->tag_set);
823 /* Stop all the virtqueues. */
824 vdev->config->reset(vdev);
826 refc = kref_read(&disk_to_dev(vblk->disk)->kobj.kref);
827 put_disk(vblk->disk);
828 vdev->config->del_vqs(vdev);
832 /* Only free device id if we don't have any users */
834 ida_simple_remove(&vd_index_ida, index);
837 #ifdef CONFIG_PM_SLEEP
838 static int virtblk_freeze(struct virtio_device *vdev)
840 struct virtio_blk *vblk = vdev->priv;
842 /* Ensure we don't receive any more interrupts */
843 vdev->config->reset(vdev);
845 /* Make sure no work handler is accessing the device. */
846 flush_work(&vblk->config_work);
848 blk_mq_stop_hw_queues(vblk->disk->queue);
850 vdev->config->del_vqs(vdev);
854 static int virtblk_restore(struct virtio_device *vdev)
856 struct virtio_blk *vblk = vdev->priv;
859 ret = init_vq(vdev->priv);
863 virtio_device_ready(vdev);
865 blk_mq_start_stopped_hw_queues(vblk->disk->queue, true);
870 static const struct virtio_device_id id_table[] = {
871 { VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID },
875 static unsigned int features_legacy[] = {
876 VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY,
877 VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE,
878 #ifdef CONFIG_VIRTIO_BLK_SCSI
881 VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE,
885 static unsigned int features[] = {
886 VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY,
887 VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE,
888 VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE,
892 static struct virtio_driver virtio_blk = {
893 .feature_table = features,
894 .feature_table_size = ARRAY_SIZE(features),
895 .feature_table_legacy = features_legacy,
896 .feature_table_size_legacy = ARRAY_SIZE(features_legacy),
897 .driver.name = KBUILD_MODNAME,
898 .driver.owner = THIS_MODULE,
899 .id_table = id_table,
900 .probe = virtblk_probe,
901 .remove = virtblk_remove,
902 .config_changed = virtblk_config_changed,
903 #ifdef CONFIG_PM_SLEEP
904 .freeze = virtblk_freeze,
905 .restore = virtblk_restore,
909 static int __init init(void)
913 virtblk_wq = alloc_workqueue("virtio-blk", 0, 0);
917 major = register_blkdev(0, "virtblk");
920 goto out_destroy_workqueue;
923 error = register_virtio_driver(&virtio_blk);
925 goto out_unregister_blkdev;
928 out_unregister_blkdev:
929 unregister_blkdev(major, "virtblk");
930 out_destroy_workqueue:
931 destroy_workqueue(virtblk_wq);
935 static void __exit fini(void)
937 unregister_virtio_driver(&virtio_blk);
938 unregister_blkdev(major, "virtblk");
939 destroy_workqueue(virtblk_wq);
944 MODULE_DEVICE_TABLE(virtio, id_table);
945 MODULE_DESCRIPTION("Virtio block driver");
946 MODULE_LICENSE("GPL");