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/virtio.h>
9 #include <linux/virtio_blk.h>
10 #include <linux/scatterlist.h>
11 #include <linux/string_helpers.h>
12 #include <scsi/scsi_cmnd.h>
13 #include <linux/idr.h>
14 #include <linux/blk-mq.h>
15 #include <linux/numa.h>
18 #define VQ_NAME_LEN 16
21 static DEFINE_IDA(vd_index_ida
);
23 static struct workqueue_struct
*virtblk_wq
;
25 struct virtio_blk_vq
{
28 char name
[VQ_NAME_LEN
];
29 } ____cacheline_aligned_in_smp
;
33 struct virtio_device
*vdev
;
35 /* The disk structure for the kernel. */
38 /* Block layer tags. */
39 struct blk_mq_tag_set tag_set
;
41 /* Process context for config space updates */
42 struct work_struct config_work
;
44 /* What host tells us, plus 2 for header & tailer. */
45 unsigned int sg_elems
;
47 /* Ida index - used to track minor number allocations. */
52 struct virtio_blk_vq
*vqs
;
58 struct virtio_blk_outhdr out_hdr
;
59 struct virtio_scsi_inhdr in_hdr
;
61 struct scatterlist sg
[];
64 static inline int virtblk_result(struct virtblk_req
*vbr
)
66 switch (vbr
->status
) {
69 case VIRTIO_BLK_S_UNSUPP
:
76 static int __virtblk_add_req(struct virtqueue
*vq
,
77 struct virtblk_req
*vbr
,
78 struct scatterlist
*data_sg
,
81 struct scatterlist hdr
, status
, cmd
, sense
, inhdr
, *sgs
[6];
82 unsigned int num_out
= 0, num_in
= 0;
83 int type
= vbr
->out_hdr
.type
& ~VIRTIO_BLK_T_OUT
;
85 sg_init_one(&hdr
, &vbr
->out_hdr
, sizeof(vbr
->out_hdr
));
86 sgs
[num_out
++] = &hdr
;
89 * If this is a packet command we need a couple of additional headers.
90 * Behind the normal outhdr we put a segment with the scsi command
91 * block, and before the normal inhdr we put the sense data and the
92 * inhdr with additional status information.
94 if (type
== VIRTIO_BLK_T_SCSI_CMD
) {
95 sg_init_one(&cmd
, vbr
->req
->cmd
, vbr
->req
->cmd_len
);
96 sgs
[num_out
++] = &cmd
;
100 if (vbr
->out_hdr
.type
& VIRTIO_BLK_T_OUT
)
101 sgs
[num_out
++] = data_sg
;
103 sgs
[num_out
+ num_in
++] = data_sg
;
106 if (type
== VIRTIO_BLK_T_SCSI_CMD
) {
107 sg_init_one(&sense
, vbr
->req
->sense
, SCSI_SENSE_BUFFERSIZE
);
108 sgs
[num_out
+ num_in
++] = &sense
;
109 sg_init_one(&inhdr
, &vbr
->in_hdr
, sizeof(vbr
->in_hdr
));
110 sgs
[num_out
+ num_in
++] = &inhdr
;
113 sg_init_one(&status
, &vbr
->status
, sizeof(vbr
->status
));
114 sgs
[num_out
+ num_in
++] = &status
;
116 return virtqueue_add_sgs(vq
, sgs
, num_out
, num_in
, vbr
, GFP_ATOMIC
);
119 static inline void virtblk_request_done(struct request
*req
)
121 struct virtblk_req
*vbr
= blk_mq_rq_to_pdu(req
);
122 int error
= virtblk_result(vbr
);
124 if (req
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
125 req
->resid_len
= vbr
->in_hdr
.residual
;
126 req
->sense_len
= vbr
->in_hdr
.sense_len
;
127 req
->errors
= vbr
->in_hdr
.errors
;
128 } else if (req
->cmd_type
== REQ_TYPE_SPECIAL
) {
129 req
->errors
= (error
!= 0);
132 blk_mq_end_io(req
, error
);
135 static void virtblk_done(struct virtqueue
*vq
)
137 struct virtio_blk
*vblk
= vq
->vdev
->priv
;
138 bool req_done
= false;
140 struct virtblk_req
*vbr
;
144 spin_lock_irqsave(&vblk
->vqs
[qid
].lock
, flags
);
146 virtqueue_disable_cb(vq
);
147 while ((vbr
= virtqueue_get_buf(vblk
->vqs
[qid
].vq
, &len
)) != NULL
) {
148 blk_mq_complete_request(vbr
->req
);
151 if (unlikely(virtqueue_is_broken(vq
)))
153 } while (!virtqueue_enable_cb(vq
));
155 /* In case queue is stopped waiting for more buffers. */
157 blk_mq_start_stopped_hw_queues(vblk
->disk
->queue
, true);
158 spin_unlock_irqrestore(&vblk
->vqs
[qid
].lock
, flags
);
161 static int virtio_queue_rq(struct blk_mq_hw_ctx
*hctx
, struct request
*req
)
163 struct virtio_blk
*vblk
= hctx
->queue
->queuedata
;
164 struct virtblk_req
*vbr
= blk_mq_rq_to_pdu(req
);
167 int qid
= hctx
->queue_num
;
168 const bool last
= (req
->cmd_flags
& REQ_END
) != 0;
172 BUG_ON(req
->nr_phys_segments
+ 2 > vblk
->sg_elems
);
175 if (req
->cmd_flags
& REQ_FLUSH
) {
176 vbr
->out_hdr
.type
= VIRTIO_BLK_T_FLUSH
;
177 vbr
->out_hdr
.sector
= 0;
178 vbr
->out_hdr
.ioprio
= req_get_ioprio(vbr
->req
);
180 switch (req
->cmd_type
) {
182 vbr
->out_hdr
.type
= 0;
183 vbr
->out_hdr
.sector
= blk_rq_pos(vbr
->req
);
184 vbr
->out_hdr
.ioprio
= req_get_ioprio(vbr
->req
);
186 case REQ_TYPE_BLOCK_PC
:
187 vbr
->out_hdr
.type
= VIRTIO_BLK_T_SCSI_CMD
;
188 vbr
->out_hdr
.sector
= 0;
189 vbr
->out_hdr
.ioprio
= req_get_ioprio(vbr
->req
);
191 case REQ_TYPE_SPECIAL
:
192 vbr
->out_hdr
.type
= VIRTIO_BLK_T_GET_ID
;
193 vbr
->out_hdr
.sector
= 0;
194 vbr
->out_hdr
.ioprio
= req_get_ioprio(vbr
->req
);
197 /* We don't put anything else in the queue. */
202 num
= blk_rq_map_sg(hctx
->queue
, vbr
->req
, vbr
->sg
);
204 if (rq_data_dir(vbr
->req
) == WRITE
)
205 vbr
->out_hdr
.type
|= VIRTIO_BLK_T_OUT
;
207 vbr
->out_hdr
.type
|= VIRTIO_BLK_T_IN
;
210 spin_lock_irqsave(&vblk
->vqs
[qid
].lock
, flags
);
211 err
= __virtblk_add_req(vblk
->vqs
[qid
].vq
, vbr
, vbr
->sg
, num
);
213 virtqueue_kick(vblk
->vqs
[qid
].vq
);
214 blk_mq_stop_hw_queue(hctx
);
215 spin_unlock_irqrestore(&vblk
->vqs
[qid
].lock
, flags
);
216 /* Out of mem doesn't actually happen, since we fall back
217 * to direct descriptors */
218 if (err
== -ENOMEM
|| err
== -ENOSPC
)
219 return BLK_MQ_RQ_QUEUE_BUSY
;
220 return BLK_MQ_RQ_QUEUE_ERROR
;
223 if (last
&& virtqueue_kick_prepare(vblk
->vqs
[qid
].vq
))
225 spin_unlock_irqrestore(&vblk
->vqs
[qid
].lock
, flags
);
228 virtqueue_notify(vblk
->vqs
[qid
].vq
);
229 return BLK_MQ_RQ_QUEUE_OK
;
232 /* return id (s/n) string for *disk to *id_str
234 static int virtblk_get_id(struct gendisk
*disk
, char *id_str
)
236 struct virtio_blk
*vblk
= disk
->private_data
;
241 bio
= bio_map_kern(vblk
->disk
->queue
, id_str
, VIRTIO_BLK_ID_BYTES
,
246 req
= blk_make_request(vblk
->disk
->queue
, bio
, GFP_KERNEL
);
252 req
->cmd_type
= REQ_TYPE_SPECIAL
;
253 err
= blk_execute_rq(vblk
->disk
->queue
, vblk
->disk
, req
, false);
254 blk_put_request(req
);
259 static int virtblk_ioctl(struct block_device
*bdev
, fmode_t mode
,
260 unsigned int cmd
, unsigned long data
)
262 struct gendisk
*disk
= bdev
->bd_disk
;
263 struct virtio_blk
*vblk
= disk
->private_data
;
266 * Only allow the generic SCSI ioctls if the host can support it.
268 if (!virtio_has_feature(vblk
->vdev
, VIRTIO_BLK_F_SCSI
))
271 return scsi_cmd_blk_ioctl(bdev
, mode
, cmd
,
272 (void __user
*)data
);
275 /* We provide getgeo only to please some old bootloader/partitioning tools */
276 static int virtblk_getgeo(struct block_device
*bd
, struct hd_geometry
*geo
)
278 struct virtio_blk
*vblk
= bd
->bd_disk
->private_data
;
280 /* see if the host passed in geometry config */
281 if (virtio_has_feature(vblk
->vdev
, VIRTIO_BLK_F_GEOMETRY
)) {
282 virtio_cread(vblk
->vdev
, struct virtio_blk_config
,
283 geometry
.cylinders
, &geo
->cylinders
);
284 virtio_cread(vblk
->vdev
, struct virtio_blk_config
,
285 geometry
.heads
, &geo
->heads
);
286 virtio_cread(vblk
->vdev
, struct virtio_blk_config
,
287 geometry
.sectors
, &geo
->sectors
);
289 /* some standard values, similar to sd */
291 geo
->sectors
= 1 << 5;
292 geo
->cylinders
= get_capacity(bd
->bd_disk
) >> 11;
297 static const struct block_device_operations virtblk_fops
= {
298 .ioctl
= virtblk_ioctl
,
299 .owner
= THIS_MODULE
,
300 .getgeo
= virtblk_getgeo
,
303 static int index_to_minor(int index
)
305 return index
<< PART_BITS
;
308 static int minor_to_index(int minor
)
310 return minor
>> PART_BITS
;
313 static ssize_t
virtblk_serial_show(struct device
*dev
,
314 struct device_attribute
*attr
, char *buf
)
316 struct gendisk
*disk
= dev_to_disk(dev
);
319 /* sysfs gives us a PAGE_SIZE buffer */
320 BUILD_BUG_ON(PAGE_SIZE
< VIRTIO_BLK_ID_BYTES
);
322 buf
[VIRTIO_BLK_ID_BYTES
] = '\0';
323 err
= virtblk_get_id(disk
, buf
);
327 if (err
== -EIO
) /* Unsupported? Make it empty. */
332 DEVICE_ATTR(serial
, S_IRUGO
, virtblk_serial_show
, NULL
);
334 static void virtblk_config_changed_work(struct work_struct
*work
)
336 struct virtio_blk
*vblk
=
337 container_of(work
, struct virtio_blk
, config_work
);
338 struct virtio_device
*vdev
= vblk
->vdev
;
339 struct request_queue
*q
= vblk
->disk
->queue
;
340 char cap_str_2
[10], cap_str_10
[10];
341 char *envp
[] = { "RESIZE=1", NULL
};
344 /* Host must always specify the capacity. */
345 virtio_cread(vdev
, struct virtio_blk_config
, capacity
, &capacity
);
347 /* If capacity is too big, truncate with warning. */
348 if ((sector_t
)capacity
!= capacity
) {
349 dev_warn(&vdev
->dev
, "Capacity %llu too large: truncating\n",
350 (unsigned long long)capacity
);
351 capacity
= (sector_t
)-1;
354 size
= capacity
* queue_logical_block_size(q
);
355 string_get_size(size
, STRING_UNITS_2
, cap_str_2
, sizeof(cap_str_2
));
356 string_get_size(size
, STRING_UNITS_10
, cap_str_10
, sizeof(cap_str_10
));
358 dev_notice(&vdev
->dev
,
359 "new size: %llu %d-byte logical blocks (%s/%s)\n",
360 (unsigned long long)capacity
,
361 queue_logical_block_size(q
),
362 cap_str_10
, cap_str_2
);
364 set_capacity(vblk
->disk
, capacity
);
365 revalidate_disk(vblk
->disk
);
366 kobject_uevent_env(&disk_to_dev(vblk
->disk
)->kobj
, KOBJ_CHANGE
, envp
);
369 static void virtblk_config_changed(struct virtio_device
*vdev
)
371 struct virtio_blk
*vblk
= vdev
->priv
;
373 queue_work(virtblk_wq
, &vblk
->config_work
);
376 static int init_vq(struct virtio_blk
*vblk
)
380 vq_callback_t
**callbacks
;
382 struct virtqueue
**vqs
;
383 unsigned short num_vqs
;
384 struct virtio_device
*vdev
= vblk
->vdev
;
386 err
= virtio_cread_feature(vdev
, VIRTIO_BLK_F_MQ
,
387 struct virtio_blk_config
, num_queues
,
392 vblk
->vqs
= kmalloc(sizeof(*vblk
->vqs
) * num_vqs
, GFP_KERNEL
);
398 names
= kmalloc(sizeof(*names
) * num_vqs
, GFP_KERNEL
);
402 callbacks
= kmalloc(sizeof(*callbacks
) * num_vqs
, GFP_KERNEL
);
406 vqs
= kmalloc(sizeof(*vqs
) * num_vqs
, GFP_KERNEL
);
410 for (i
= 0; i
< num_vqs
; i
++) {
411 callbacks
[i
] = virtblk_done
;
412 snprintf(vblk
->vqs
[i
].name
, VQ_NAME_LEN
, "req.%d", i
);
413 names
[i
] = vblk
->vqs
[i
].name
;
416 /* Discover virtqueues and write information to configuration. */
417 err
= vdev
->config
->find_vqs(vdev
, num_vqs
, vqs
, callbacks
, names
);
421 for (i
= 0; i
< num_vqs
; i
++) {
422 spin_lock_init(&vblk
->vqs
[i
].lock
);
423 vblk
->vqs
[i
].vq
= vqs
[i
];
425 vblk
->num_vqs
= num_vqs
;
441 * Legacy naming scheme used for virtio devices. We are stuck with it for
442 * virtio blk but don't ever use it for any new driver.
444 static int virtblk_name_format(char *prefix
, int index
, char *buf
, int buflen
)
446 const int base
= 'z' - 'a' + 1;
447 char *begin
= buf
+ strlen(prefix
);
448 char *end
= buf
+ buflen
;
458 *--p
= 'a' + (index
% unit
);
459 index
= (index
/ unit
) - 1;
460 } while (index
>= 0);
462 memmove(begin
, p
, end
- p
);
463 memcpy(buf
, prefix
, strlen(prefix
));
468 static int virtblk_get_cache_mode(struct virtio_device
*vdev
)
473 err
= virtio_cread_feature(vdev
, VIRTIO_BLK_F_CONFIG_WCE
,
474 struct virtio_blk_config
, wce
,
477 writeback
= virtio_has_feature(vdev
, VIRTIO_BLK_F_WCE
);
482 static void virtblk_update_cache_mode(struct virtio_device
*vdev
)
484 u8 writeback
= virtblk_get_cache_mode(vdev
);
485 struct virtio_blk
*vblk
= vdev
->priv
;
488 blk_queue_flush(vblk
->disk
->queue
, REQ_FLUSH
);
490 blk_queue_flush(vblk
->disk
->queue
, 0);
492 revalidate_disk(vblk
->disk
);
495 static const char *const virtblk_cache_types
[] = {
496 "write through", "write back"
500 virtblk_cache_type_store(struct device
*dev
, struct device_attribute
*attr
,
501 const char *buf
, size_t count
)
503 struct gendisk
*disk
= dev_to_disk(dev
);
504 struct virtio_blk
*vblk
= disk
->private_data
;
505 struct virtio_device
*vdev
= vblk
->vdev
;
508 BUG_ON(!virtio_has_feature(vblk
->vdev
, VIRTIO_BLK_F_CONFIG_WCE
));
509 for (i
= ARRAY_SIZE(virtblk_cache_types
); --i
>= 0; )
510 if (sysfs_streq(buf
, virtblk_cache_types
[i
]))
516 virtio_cwrite8(vdev
, offsetof(struct virtio_blk_config
, wce
), i
);
517 virtblk_update_cache_mode(vdev
);
522 virtblk_cache_type_show(struct device
*dev
, struct device_attribute
*attr
,
525 struct gendisk
*disk
= dev_to_disk(dev
);
526 struct virtio_blk
*vblk
= disk
->private_data
;
527 u8 writeback
= virtblk_get_cache_mode(vblk
->vdev
);
529 BUG_ON(writeback
>= ARRAY_SIZE(virtblk_cache_types
));
530 return snprintf(buf
, 40, "%s\n", virtblk_cache_types
[writeback
]);
533 static const struct device_attribute dev_attr_cache_type_ro
=
534 __ATTR(cache_type
, S_IRUGO
,
535 virtblk_cache_type_show
, NULL
);
536 static const struct device_attribute dev_attr_cache_type_rw
=
537 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
,
538 virtblk_cache_type_show
, virtblk_cache_type_store
);
540 static int virtblk_init_request(void *data
, struct request
*rq
,
541 unsigned int hctx_idx
, unsigned int request_idx
,
542 unsigned int numa_node
)
544 struct virtio_blk
*vblk
= data
;
545 struct virtblk_req
*vbr
= blk_mq_rq_to_pdu(rq
);
547 sg_init_table(vbr
->sg
, vblk
->sg_elems
);
551 static struct blk_mq_ops virtio_mq_ops
= {
552 .queue_rq
= virtio_queue_rq
,
553 .map_queue
= blk_mq_map_queue
,
554 .complete
= virtblk_request_done
,
555 .init_request
= virtblk_init_request
,
558 static unsigned int virtblk_queue_depth
;
559 module_param_named(queue_depth
, virtblk_queue_depth
, uint
, 0444);
561 static int virtblk_probe(struct virtio_device
*vdev
)
563 struct virtio_blk
*vblk
;
564 struct request_queue
*q
;
568 u32 v
, blk_size
, sg_elems
, opt_io_size
;
570 u8 physical_block_exp
, alignment_offset
;
572 err
= ida_simple_get(&vd_index_ida
, 0, minor_to_index(1 << MINORBITS
),
578 /* We need to know how many segments before we allocate. */
579 err
= virtio_cread_feature(vdev
, VIRTIO_BLK_F_SEG_MAX
,
580 struct virtio_blk_config
, seg_max
,
583 /* We need at least one SG element, whatever they say. */
584 if (err
|| !sg_elems
)
587 /* We need an extra sg elements at head and tail. */
589 vdev
->priv
= vblk
= kmalloc(sizeof(*vblk
), GFP_KERNEL
);
596 vblk
->sg_elems
= sg_elems
;
598 INIT_WORK(&vblk
->config_work
, virtblk_config_changed_work
);
604 /* FIXME: How many partitions? How long is a piece of string? */
605 vblk
->disk
= alloc_disk(1 << PART_BITS
);
611 /* Default queue sizing is to fill the ring. */
612 if (!virtblk_queue_depth
) {
613 virtblk_queue_depth
= vblk
->vqs
[0].vq
->num_free
;
614 /* ... but without indirect descs, we use 2 descs per req */
615 if (!virtio_has_feature(vdev
, VIRTIO_RING_F_INDIRECT_DESC
))
616 virtblk_queue_depth
/= 2;
619 memset(&vblk
->tag_set
, 0, sizeof(vblk
->tag_set
));
620 vblk
->tag_set
.ops
= &virtio_mq_ops
;
621 vblk
->tag_set
.queue_depth
= virtblk_queue_depth
;
622 vblk
->tag_set
.numa_node
= NUMA_NO_NODE
;
623 vblk
->tag_set
.flags
= BLK_MQ_F_SHOULD_MERGE
;
624 vblk
->tag_set
.cmd_size
=
625 sizeof(struct virtblk_req
) +
626 sizeof(struct scatterlist
) * sg_elems
;
627 vblk
->tag_set
.driver_data
= vblk
;
628 vblk
->tag_set
.nr_hw_queues
= vblk
->num_vqs
;
630 err
= blk_mq_alloc_tag_set(&vblk
->tag_set
);
634 q
= vblk
->disk
->queue
= blk_mq_init_queue(&vblk
->tag_set
);
642 virtblk_name_format("vd", index
, vblk
->disk
->disk_name
, DISK_NAME_LEN
);
644 vblk
->disk
->major
= major
;
645 vblk
->disk
->first_minor
= index_to_minor(index
);
646 vblk
->disk
->private_data
= vblk
;
647 vblk
->disk
->fops
= &virtblk_fops
;
648 vblk
->disk
->driverfs_dev
= &vdev
->dev
;
651 /* configure queue flush support */
652 virtblk_update_cache_mode(vdev
);
654 /* If disk is read-only in the host, the guest should obey */
655 if (virtio_has_feature(vdev
, VIRTIO_BLK_F_RO
))
656 set_disk_ro(vblk
->disk
, 1);
658 /* Host must always specify the capacity. */
659 virtio_cread(vdev
, struct virtio_blk_config
, capacity
, &cap
);
661 /* If capacity is too big, truncate with warning. */
662 if ((sector_t
)cap
!= cap
) {
663 dev_warn(&vdev
->dev
, "Capacity %llu too large: truncating\n",
664 (unsigned long long)cap
);
667 set_capacity(vblk
->disk
, cap
);
669 /* We can handle whatever the host told us to handle. */
670 blk_queue_max_segments(q
, vblk
->sg_elems
-2);
672 /* No need to bounce any requests */
673 blk_queue_bounce_limit(q
, BLK_BOUNCE_ANY
);
675 /* No real sector limit. */
676 blk_queue_max_hw_sectors(q
, -1U);
678 /* Host can optionally specify maximum segment size and number of
680 err
= virtio_cread_feature(vdev
, VIRTIO_BLK_F_SIZE_MAX
,
681 struct virtio_blk_config
, size_max
, &v
);
683 blk_queue_max_segment_size(q
, v
);
685 blk_queue_max_segment_size(q
, -1U);
687 /* Host can optionally specify the block size of the device */
688 err
= virtio_cread_feature(vdev
, VIRTIO_BLK_F_BLK_SIZE
,
689 struct virtio_blk_config
, blk_size
,
692 blk_queue_logical_block_size(q
, blk_size
);
694 blk_size
= queue_logical_block_size(q
);
696 /* Use topology information if available */
697 err
= virtio_cread_feature(vdev
, VIRTIO_BLK_F_TOPOLOGY
,
698 struct virtio_blk_config
, physical_block_exp
,
699 &physical_block_exp
);
700 if (!err
&& physical_block_exp
)
701 blk_queue_physical_block_size(q
,
702 blk_size
* (1 << physical_block_exp
));
704 err
= virtio_cread_feature(vdev
, VIRTIO_BLK_F_TOPOLOGY
,
705 struct virtio_blk_config
, alignment_offset
,
707 if (!err
&& alignment_offset
)
708 blk_queue_alignment_offset(q
, blk_size
* alignment_offset
);
710 err
= virtio_cread_feature(vdev
, VIRTIO_BLK_F_TOPOLOGY
,
711 struct virtio_blk_config
, min_io_size
,
713 if (!err
&& min_io_size
)
714 blk_queue_io_min(q
, blk_size
* min_io_size
);
716 err
= virtio_cread_feature(vdev
, VIRTIO_BLK_F_TOPOLOGY
,
717 struct virtio_blk_config
, opt_io_size
,
719 if (!err
&& opt_io_size
)
720 blk_queue_io_opt(q
, blk_size
* opt_io_size
);
722 virtio_device_ready(vdev
);
724 add_disk(vblk
->disk
);
725 err
= device_create_file(disk_to_dev(vblk
->disk
), &dev_attr_serial
);
729 if (virtio_has_feature(vdev
, VIRTIO_BLK_F_CONFIG_WCE
))
730 err
= device_create_file(disk_to_dev(vblk
->disk
),
731 &dev_attr_cache_type_rw
);
733 err
= device_create_file(disk_to_dev(vblk
->disk
),
734 &dev_attr_cache_type_ro
);
740 del_gendisk(vblk
->disk
);
741 blk_cleanup_queue(vblk
->disk
->queue
);
743 blk_mq_free_tag_set(&vblk
->tag_set
);
745 put_disk(vblk
->disk
);
747 vdev
->config
->del_vqs(vdev
);
751 ida_simple_remove(&vd_index_ida
, index
);
756 static void virtblk_remove(struct virtio_device
*vdev
)
758 struct virtio_blk
*vblk
= vdev
->priv
;
759 int index
= vblk
->index
;
762 /* Make sure no work handler is accessing the device. */
763 flush_work(&vblk
->config_work
);
765 del_gendisk(vblk
->disk
);
766 blk_cleanup_queue(vblk
->disk
->queue
);
768 blk_mq_free_tag_set(&vblk
->tag_set
);
770 /* Stop all the virtqueues. */
771 vdev
->config
->reset(vdev
);
773 refc
= atomic_read(&disk_to_dev(vblk
->disk
)->kobj
.kref
.refcount
);
774 put_disk(vblk
->disk
);
775 vdev
->config
->del_vqs(vdev
);
779 /* Only free device id if we don't have any users */
781 ida_simple_remove(&vd_index_ida
, index
);
784 #ifdef CONFIG_PM_SLEEP
785 static int virtblk_freeze(struct virtio_device
*vdev
)
787 struct virtio_blk
*vblk
= vdev
->priv
;
789 /* Ensure we don't receive any more interrupts */
790 vdev
->config
->reset(vdev
);
792 /* Make sure no work handler is accessing the device. */
793 flush_work(&vblk
->config_work
);
795 blk_mq_stop_hw_queues(vblk
->disk
->queue
);
797 vdev
->config
->del_vqs(vdev
);
801 static int virtblk_restore(struct virtio_device
*vdev
)
803 struct virtio_blk
*vblk
= vdev
->priv
;
806 ret
= init_vq(vdev
->priv
);
810 virtio_device_ready(vdev
);
812 blk_mq_start_stopped_hw_queues(vblk
->disk
->queue
, true);
817 static const struct virtio_device_id id_table
[] = {
818 { VIRTIO_ID_BLOCK
, VIRTIO_DEV_ANY_ID
},
822 static unsigned int features
[] = {
823 VIRTIO_BLK_F_SEG_MAX
, VIRTIO_BLK_F_SIZE_MAX
, VIRTIO_BLK_F_GEOMETRY
,
824 VIRTIO_BLK_F_RO
, VIRTIO_BLK_F_BLK_SIZE
, VIRTIO_BLK_F_SCSI
,
825 VIRTIO_BLK_F_WCE
, VIRTIO_BLK_F_TOPOLOGY
, VIRTIO_BLK_F_CONFIG_WCE
,
829 static struct virtio_driver virtio_blk
= {
830 .feature_table
= features
,
831 .feature_table_size
= ARRAY_SIZE(features
),
832 .driver
.name
= KBUILD_MODNAME
,
833 .driver
.owner
= THIS_MODULE
,
834 .id_table
= id_table
,
835 .probe
= virtblk_probe
,
836 .remove
= virtblk_remove
,
837 .config_changed
= virtblk_config_changed
,
838 #ifdef CONFIG_PM_SLEEP
839 .freeze
= virtblk_freeze
,
840 .restore
= virtblk_restore
,
844 static int __init
init(void)
848 virtblk_wq
= alloc_workqueue("virtio-blk", 0, 0);
852 major
= register_blkdev(0, "virtblk");
855 goto out_destroy_workqueue
;
858 error
= register_virtio_driver(&virtio_blk
);
860 goto out_unregister_blkdev
;
863 out_unregister_blkdev
:
864 unregister_blkdev(major
, "virtblk");
865 out_destroy_workqueue
:
866 destroy_workqueue(virtblk_wq
);
870 static void __exit
fini(void)
872 unregister_blkdev(major
, "virtblk");
873 unregister_virtio_driver(&virtio_blk
);
874 destroy_workqueue(virtblk_wq
);
879 MODULE_DEVICE_TABLE(virtio
, id_table
);
880 MODULE_DESCRIPTION("Virtio block driver");
881 MODULE_LICENSE("GPL");