blob: 28cff0d23d829ece7f2b00685b3ab089c632c5f9 [file] [log] [blame]
Rusty Russelle467cde2007-10-22 11:03:38 +10001//#define DEBUG
2#include <linux/spinlock.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09003#include <linux/slab.h>
Rusty Russelle467cde2007-10-22 11:03:38 +10004#include <linux/blkdev.h>
5#include <linux/hdreg.h>
Paul Gortmaker0c8d44f2011-07-01 15:56:05 -04006#include <linux/module.h>
Michael S. Tsirkin4678d6f2012-01-12 15:44:44 +10307#include <linux/mutex.h>
Rusty Russelle467cde2007-10-22 11:03:38 +10008#include <linux/virtio.h>
9#include <linux/virtio_blk.h>
Jens Axboe3d1266c2007-10-24 13:21:21 +020010#include <linux/scatterlist.h>
Christoph Hellwig7a7c9242011-02-01 21:43:48 +010011#include <linux/string_helpers.h>
Liu Yuan6917f832011-04-24 02:49:26 +080012#include <scsi/scsi_cmnd.h>
Michael S. Tsirkin5087a502011-10-30 21:29:59 +020013#include <linux/idr.h>
Jens Axboe1cf7e9c2013-11-01 10:52:52 -060014#include <linux/blk-mq.h>
15#include <linux/numa.h>
Jens Axboe3d1266c2007-10-24 13:21:21 +020016
Christian Borntraeger4f3bf192008-01-31 15:53:53 +010017#define PART_BITS 4
Ming Lei6a27b652014-06-26 17:41:48 +080018#define VQ_NAME_LEN 16
Rusty Russelle467cde2007-10-22 11:03:38 +100019
Michael S. Tsirkin5087a502011-10-30 21:29:59 +020020static int major;
21static DEFINE_IDA(vd_index_ida);
22
Jonghwan Choi2a647bf2013-05-20 10:25:39 +093023static struct workqueue_struct *virtblk_wq;
Christian Borntraeger4f3bf192008-01-31 15:53:53 +010024
Ming Lei6a27b652014-06-26 17:41:48 +080025struct virtio_blk_vq {
26 struct virtqueue *vq;
27 spinlock_t lock;
28 char name[VQ_NAME_LEN];
29} ____cacheline_aligned_in_smp;
30
Michael S. Tsirkinbb6ec572015-01-15 13:33:31 +020031struct virtio_blk {
Rusty Russelle467cde2007-10-22 11:03:38 +100032 struct virtio_device *vdev;
Rusty Russelle467cde2007-10-22 11:03:38 +100033
34 /* The disk structure for the kernel. */
35 struct gendisk *disk;
36
Christoph Hellwig24d2f902014-04-15 14:14:00 -060037 /* Block layer tags. */
38 struct blk_mq_tag_set tag_set;
39
Christoph Hellwig7a7c9242011-02-01 21:43:48 +010040 /* Process context for config space updates */
41 struct work_struct config_work;
42
Rusty Russell0864b792008-12-30 09:26:05 -060043 /* What host tells us, plus 2 for header & tailer. */
44 unsigned int sg_elems;
45
Michael S. Tsirkin5087a502011-10-30 21:29:59 +020046 /* Ida index - used to track minor number allocations. */
47 int index;
Ming Lei6a27b652014-06-26 17:41:48 +080048
49 /* num of vqs */
50 int num_vqs;
51 struct virtio_blk_vq *vqs;
Rusty Russelle467cde2007-10-22 11:03:38 +100052};
53
Michael S. Tsirkinbb6ec572015-01-15 13:33:31 +020054struct virtblk_req {
Rusty Russelle467cde2007-10-22 11:03:38 +100055 struct request *req;
56 struct virtio_blk_outhdr out_hdr;
Hannes Reinecke1cde26f2009-05-18 14:41:30 +020057 struct virtio_scsi_inhdr in_hdr;
Rusty Russellcb38fa22008-05-02 21:50:45 -050058 u8 status;
Asias Hea98755c2012-08-08 16:07:04 +080059 struct scatterlist sg[];
Rusty Russelle467cde2007-10-22 11:03:38 +100060};
61
Asias Hea98755c2012-08-08 16:07:04 +080062static inline int virtblk_result(struct virtblk_req *vbr)
63{
64 switch (vbr->status) {
65 case VIRTIO_BLK_S_OK:
66 return 0;
67 case VIRTIO_BLK_S_UNSUPP:
68 return -ENOTTY;
69 default:
70 return -EIO;
71 }
72}
73
Paolo Bonzini8f39db92013-03-20 15:44:27 +103074static int __virtblk_add_req(struct virtqueue *vq,
Paolo Bonzini20af3cf2013-03-20 15:44:27 +103075 struct virtblk_req *vbr,
76 struct scatterlist *data_sg,
Rusty Russell0a11cc32013-03-20 15:44:27 +103077 bool have_data)
Asias Hec85a1f92012-08-08 16:07:05 +080078{
Paolo Bonzini20af3cf2013-03-20 15:44:27 +103079 struct scatterlist hdr, status, cmd, sense, inhdr, *sgs[6];
Paolo Bonzini8f39db92013-03-20 15:44:27 +103080 unsigned int num_out = 0, num_in = 0;
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +020081 __virtio32 type = vbr->out_hdr.type & ~cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_OUT);
Paolo Bonzini8f39db92013-03-20 15:44:27 +103082
83 sg_init_one(&hdr, &vbr->out_hdr, sizeof(vbr->out_hdr));
84 sgs[num_out++] = &hdr;
85
Paolo Bonzini20af3cf2013-03-20 15:44:27 +103086 /*
87 * If this is a packet command we need a couple of additional headers.
88 * Behind the normal outhdr we put a segment with the scsi command
89 * block, and before the normal inhdr we put the sense data and the
90 * inhdr with additional status information.
91 */
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +020092 if (type == cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_SCSI_CMD)) {
Paolo Bonzini20af3cf2013-03-20 15:44:27 +103093 sg_init_one(&cmd, vbr->req->cmd, vbr->req->cmd_len);
94 sgs[num_out++] = &cmd;
95 }
96
Rusty Russell0a11cc32013-03-20 15:44:27 +103097 if (have_data) {
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +020098 if (vbr->out_hdr.type & cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_OUT))
Paolo Bonzini20af3cf2013-03-20 15:44:27 +103099 sgs[num_out++] = data_sg;
Paolo Bonzini8f39db92013-03-20 15:44:27 +1030100 else
Paolo Bonzini20af3cf2013-03-20 15:44:27 +1030101 sgs[num_out + num_in++] = data_sg;
102 }
103
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +0200104 if (type == cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_SCSI_CMD)) {
Paolo Bonzini20af3cf2013-03-20 15:44:27 +1030105 sg_init_one(&sense, vbr->req->sense, SCSI_SENSE_BUFFERSIZE);
106 sgs[num_out + num_in++] = &sense;
107 sg_init_one(&inhdr, &vbr->in_hdr, sizeof(vbr->in_hdr));
108 sgs[num_out + num_in++] = &inhdr;
Paolo Bonzini8f39db92013-03-20 15:44:27 +1030109 }
110
111 sg_init_one(&status, &vbr->status, sizeof(vbr->status));
112 sgs[num_out + num_in++] = &status;
113
114 return virtqueue_add_sgs(vq, sgs, num_out, num_in, vbr, GFP_ATOMIC);
Paolo Bonzini5ee21a52013-03-20 15:44:27 +1030115}
Asias Hec85a1f92012-08-08 16:07:05 +0800116
Christoph Hellwig5124c282014-02-10 03:24:39 -0800117static inline void virtblk_request_done(struct request *req)
Asias Hec85a1f92012-08-08 16:07:05 +0800118{
Christoph Hellwig9d74e252014-04-14 10:30:07 +0200119 struct virtblk_req *vbr = blk_mq_rq_to_pdu(req);
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +0200120 struct virtio_blk *vblk = req->q->queuedata;
Asias Hea98755c2012-08-08 16:07:04 +0800121 int error = virtblk_result(vbr);
122
123 if (req->cmd_type == REQ_TYPE_BLOCK_PC) {
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +0200124 req->resid_len = virtio32_to_cpu(vblk->vdev, vbr->in_hdr.residual);
125 req->sense_len = virtio32_to_cpu(vblk->vdev, vbr->in_hdr.sense_len);
126 req->errors = virtio32_to_cpu(vblk->vdev, vbr->in_hdr.errors);
Christoph Hellwig4f8c9512015-04-17 22:37:16 +0200127 } else if (req->cmd_type == REQ_TYPE_DRV_PRIV) {
Asias Hea98755c2012-08-08 16:07:04 +0800128 req->errors = (error != 0);
129 }
130
Christoph Hellwigc8a446a2014-09-13 16:40:10 -0700131 blk_mq_end_request(req, error);
Asias Hea98755c2012-08-08 16:07:04 +0800132}
133
134static void virtblk_done(struct virtqueue *vq)
Rusty Russelle467cde2007-10-22 11:03:38 +1000135{
136 struct virtio_blk *vblk = vq->vdev->priv;
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600137 bool req_done = false;
Ming Lei6a27b652014-06-26 17:41:48 +0800138 int qid = vq->index;
Rusty Russelle467cde2007-10-22 11:03:38 +1000139 struct virtblk_req *vbr;
Rusty Russelle467cde2007-10-22 11:03:38 +1000140 unsigned long flags;
Asias Hea98755c2012-08-08 16:07:04 +0800141 unsigned int len;
Rusty Russelle467cde2007-10-22 11:03:38 +1000142
Ming Lei6a27b652014-06-26 17:41:48 +0800143 spin_lock_irqsave(&vblk->vqs[qid].lock, flags);
Asias Hebb811102012-09-25 10:36:17 +0800144 do {
145 virtqueue_disable_cb(vq);
Ming Lei6a27b652014-06-26 17:41:48 +0800146 while ((vbr = virtqueue_get_buf(vblk->vqs[qid].vq, &len)) != NULL) {
Christoph Hellwigf4829a92015-09-27 21:01:50 +0200147 blk_mq_complete_request(vbr->req, vbr->req->errors);
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600148 req_done = true;
Rusty Russelle467cde2007-10-22 11:03:38 +1000149 }
Heinz Graalfs7f03b172013-10-29 09:40:30 +1030150 if (unlikely(virtqueue_is_broken(vq)))
151 break;
Asias Hebb811102012-09-25 10:36:17 +0800152 } while (!virtqueue_enable_cb(vq));
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600153
Rusty Russelle467cde2007-10-22 11:03:38 +1000154 /* In case queue is stopped waiting for more buffers. */
Asias Hea98755c2012-08-08 16:07:04 +0800155 if (req_done)
Christoph Hellwig1b4a3252014-04-16 09:44:54 +0200156 blk_mq_start_stopped_hw_queues(vblk->disk->queue, true);
Ming Lei6a27b652014-06-26 17:41:48 +0800157 spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
Asias Hea98755c2012-08-08 16:07:04 +0800158}
159
Jens Axboe74c45052014-10-29 11:14:52 -0600160static int virtio_queue_rq(struct blk_mq_hw_ctx *hctx,
161 const struct blk_mq_queue_data *bd)
Rusty Russelle467cde2007-10-22 11:03:38 +1000162{
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600163 struct virtio_blk *vblk = hctx->queue->queuedata;
Jens Axboe74c45052014-10-29 11:14:52 -0600164 struct request *req = bd->rq;
Christoph Hellwig9d74e252014-04-14 10:30:07 +0200165 struct virtblk_req *vbr = blk_mq_rq_to_pdu(req);
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600166 unsigned long flags;
Paolo Bonzini20af3cf2013-03-20 15:44:27 +1030167 unsigned int num;
Ming Lei6a27b652014-06-26 17:41:48 +0800168 int qid = hctx->queue_num;
Rusty Russell5261b852014-03-13 11:23:39 +1030169 int err;
Ming Leie8edca62014-05-30 10:49:29 +0800170 bool notify = false;
Rusty Russelle467cde2007-10-22 11:03:38 +1000171
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600172 BUG_ON(req->nr_phys_segments + 2 > vblk->sg_elems);
Rusty Russelle467cde2007-10-22 11:03:38 +1000173
174 vbr->req = req;
FUJITA Tomonoridd40e452010-07-03 17:45:38 +0900175 if (req->cmd_flags & REQ_FLUSH) {
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +0200176 vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_FLUSH);
Rusty Russelle467cde2007-10-22 11:03:38 +1000177 vbr->out_hdr.sector = 0;
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +0200178 vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req));
FUJITA Tomonoridd40e452010-07-03 17:45:38 +0900179 } else {
180 switch (req->cmd_type) {
181 case REQ_TYPE_FS:
182 vbr->out_hdr.type = 0;
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +0200183 vbr->out_hdr.sector = cpu_to_virtio64(vblk->vdev, blk_rq_pos(vbr->req));
184 vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req));
FUJITA Tomonoridd40e452010-07-03 17:45:38 +0900185 break;
186 case REQ_TYPE_BLOCK_PC:
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +0200187 vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_SCSI_CMD);
Christoph Hellwigf1b0ef062009-09-17 19:57:42 +0200188 vbr->out_hdr.sector = 0;
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +0200189 vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req));
Christoph Hellwigf1b0ef062009-09-17 19:57:42 +0200190 break;
Christoph Hellwig4f8c9512015-04-17 22:37:16 +0200191 case REQ_TYPE_DRV_PRIV:
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +0200192 vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_GET_ID);
FUJITA Tomonoridd40e452010-07-03 17:45:38 +0900193 vbr->out_hdr.sector = 0;
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +0200194 vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req));
FUJITA Tomonoridd40e452010-07-03 17:45:38 +0900195 break;
196 default:
197 /* We don't put anything else in the queue. */
198 BUG();
Christoph Hellwigf1b0ef062009-09-17 19:57:42 +0200199 }
Rusty Russelle467cde2007-10-22 11:03:38 +1000200 }
201
Christoph Hellwige2490072014-09-13 16:40:09 -0700202 blk_mq_start_request(req);
203
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600204 num = blk_rq_map_sg(hctx->queue, vbr->req, vbr->sg);
Hannes Reinecke1cde26f2009-05-18 14:41:30 +0200205 if (num) {
Paolo Bonzini20af3cf2013-03-20 15:44:27 +1030206 if (rq_data_dir(vbr->req) == WRITE)
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +0200207 vbr->out_hdr.type |= cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_OUT);
Paolo Bonzini20af3cf2013-03-20 15:44:27 +1030208 else
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +0200209 vbr->out_hdr.type |= cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_IN);
Rusty Russelle467cde2007-10-22 11:03:38 +1000210 }
211
Ming Lei6a27b652014-06-26 17:41:48 +0800212 spin_lock_irqsave(&vblk->vqs[qid].lock, flags);
213 err = __virtblk_add_req(vblk->vqs[qid].vq, vbr, vbr->sg, num);
Rusty Russell5261b852014-03-13 11:23:39 +1030214 if (err) {
Ming Lei6a27b652014-06-26 17:41:48 +0800215 virtqueue_kick(vblk->vqs[qid].vq);
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600216 blk_mq_stop_hw_queue(hctx);
Ming Lei6a27b652014-06-26 17:41:48 +0800217 spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
Rusty Russell5261b852014-03-13 11:23:39 +1030218 /* Out of mem doesn't actually happen, since we fall back
219 * to direct descriptors */
220 if (err == -ENOMEM || err == -ENOSPC)
221 return BLK_MQ_RQ_QUEUE_BUSY;
222 return BLK_MQ_RQ_QUEUE_ERROR;
Asias Hea98755c2012-08-08 16:07:04 +0800223 }
224
Jens Axboe74c45052014-10-29 11:14:52 -0600225 if (bd->last && virtqueue_kick_prepare(vblk->vqs[qid].vq))
Ming Leie8edca62014-05-30 10:49:29 +0800226 notify = true;
Ming Lei6a27b652014-06-26 17:41:48 +0800227 spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
Ming Leie8edca62014-05-30 10:49:29 +0800228
229 if (notify)
Ming Lei6a27b652014-06-26 17:41:48 +0800230 virtqueue_notify(vblk->vqs[qid].vq);
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600231 return BLK_MQ_RQ_QUEUE_OK;
Asias Hea98755c2012-08-08 16:07:04 +0800232}
233
john cooper4cb2ea22010-03-25 01:33:33 -0400234/* return id (s/n) string for *disk to *id_str
235 */
236static int virtblk_get_id(struct gendisk *disk, char *id_str)
237{
238 struct virtio_blk *vblk = disk->private_data;
239 struct request *req;
240 struct bio *bio;
Mike Snitzere4c47762010-10-09 12:12:13 +1030241 int err;
john cooper4cb2ea22010-03-25 01:33:33 -0400242
243 bio = bio_map_kern(vblk->disk->queue, id_str, VIRTIO_BLK_ID_BYTES,
244 GFP_KERNEL);
245 if (IS_ERR(bio))
246 return PTR_ERR(bio);
247
248 req = blk_make_request(vblk->disk->queue, bio, GFP_KERNEL);
249 if (IS_ERR(req)) {
250 bio_put(bio);
251 return PTR_ERR(req);
252 }
253
Christoph Hellwig4f8c9512015-04-17 22:37:16 +0200254 req->cmd_type = REQ_TYPE_DRV_PRIV;
Mike Snitzere4c47762010-10-09 12:12:13 +1030255 err = blk_execute_rq(vblk->disk->queue, vblk->disk, req, false);
256 blk_put_request(req);
257
258 return err;
john cooper4cb2ea22010-03-25 01:33:33 -0400259}
260
Christoph Hellwigfe5a50a2010-09-15 01:27:23 +0200261static int virtblk_ioctl(struct block_device *bdev, fmode_t mode,
262 unsigned int cmd, unsigned long data)
Rusty Russelle467cde2007-10-22 11:03:38 +1000263{
Hannes Reinecke1cde26f2009-05-18 14:41:30 +0200264 struct gendisk *disk = bdev->bd_disk;
265 struct virtio_blk *vblk = disk->private_data;
266
267 /*
268 * Only allow the generic SCSI ioctls if the host can support it.
269 */
270 if (!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_SCSI))
Christoph Hellwigd9ecdea2009-06-20 21:29:41 +0200271 return -ENOTTY;
Hannes Reinecke1cde26f2009-05-18 14:41:30 +0200272
Paolo Bonzini577ebb32012-01-12 16:01:27 +0100273 return scsi_cmd_blk_ioctl(bdev, mode, cmd,
274 (void __user *)data);
Rusty Russelle467cde2007-10-22 11:03:38 +1000275}
276
Christian Borntraeger135da0b2008-01-23 17:56:50 +0100277/* We provide getgeo only to please some old bootloader/partitioning tools */
278static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
279{
Ryan Harper48e40432008-04-16 13:56:37 -0500280 struct virtio_blk *vblk = bd->bd_disk->private_data;
Ryan Harper48e40432008-04-16 13:56:37 -0500281
282 /* see if the host passed in geometry config */
Rusty Russell855e0c52013-10-14 18:11:51 +1030283 if (virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_GEOMETRY)) {
284 virtio_cread(vblk->vdev, struct virtio_blk_config,
285 geometry.cylinders, &geo->cylinders);
286 virtio_cread(vblk->vdev, struct virtio_blk_config,
287 geometry.heads, &geo->heads);
288 virtio_cread(vblk->vdev, struct virtio_blk_config,
289 geometry.sectors, &geo->sectors);
Ryan Harper48e40432008-04-16 13:56:37 -0500290 } else {
291 /* some standard values, similar to sd */
292 geo->heads = 1 << 6;
293 geo->sectors = 1 << 5;
294 geo->cylinders = get_capacity(bd->bd_disk) >> 11;
295 }
Christian Borntraeger135da0b2008-01-23 17:56:50 +0100296 return 0;
297}
298
Alexey Dobriyan83d5cde2009-09-21 17:01:13 -0700299static const struct block_device_operations virtblk_fops = {
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200300 .ioctl = virtblk_ioctl,
Christian Borntraeger135da0b2008-01-23 17:56:50 +0100301 .owner = THIS_MODULE,
302 .getgeo = virtblk_getgeo,
Rusty Russelle467cde2007-10-22 11:03:38 +1000303};
304
Christian Borntraegerd50ed902008-02-01 09:05:00 +0100305static int index_to_minor(int index)
306{
307 return index << PART_BITS;
308}
309
Michael S. Tsirkin5087a502011-10-30 21:29:59 +0200310static int minor_to_index(int minor)
311{
312 return minor >> PART_BITS;
313}
314
Ryan Harpera5eb9e42010-06-23 22:19:57 -0500315static ssize_t virtblk_serial_show(struct device *dev,
316 struct device_attribute *attr, char *buf)
317{
318 struct gendisk *disk = dev_to_disk(dev);
319 int err;
320
321 /* sysfs gives us a PAGE_SIZE buffer */
322 BUILD_BUG_ON(PAGE_SIZE < VIRTIO_BLK_ID_BYTES);
323
324 buf[VIRTIO_BLK_ID_BYTES] = '\0';
325 err = virtblk_get_id(disk, buf);
326 if (!err)
327 return strlen(buf);
328
329 if (err == -EIO) /* Unsupported? Make it empty. */
330 return 0;
331
332 return err;
333}
Michael S. Tsirkin393c5252014-10-23 16:08:44 +0300334
335static DEVICE_ATTR(serial, S_IRUGO, virtblk_serial_show, NULL);
Ryan Harpera5eb9e42010-06-23 22:19:57 -0500336
Christoph Hellwig7a7c9242011-02-01 21:43:48 +0100337static void virtblk_config_changed_work(struct work_struct *work)
338{
339 struct virtio_blk *vblk =
340 container_of(work, struct virtio_blk, config_work);
341 struct virtio_device *vdev = vblk->vdev;
342 struct request_queue *q = vblk->disk->queue;
343 char cap_str_2[10], cap_str_10[10];
Milos Vyletel9d9598b2013-03-12 15:34:40 +1030344 char *envp[] = { "RESIZE=1", NULL };
James Bottomleyb9f28d82015-03-05 18:47:01 -0800345 u64 capacity;
Christoph Hellwig7a7c9242011-02-01 21:43:48 +0100346
347 /* Host must always specify the capacity. */
Rusty Russell855e0c52013-10-14 18:11:51 +1030348 virtio_cread(vdev, struct virtio_blk_config, capacity, &capacity);
Christoph Hellwig7a7c9242011-02-01 21:43:48 +0100349
350 /* If capacity is too big, truncate with warning. */
351 if ((sector_t)capacity != capacity) {
352 dev_warn(&vdev->dev, "Capacity %llu too large: truncating\n",
353 (unsigned long long)capacity);
354 capacity = (sector_t)-1;
355 }
356
James Bottomleyb9f28d82015-03-05 18:47:01 -0800357 string_get_size(capacity, queue_logical_block_size(q),
358 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
359 string_get_size(capacity, queue_logical_block_size(q),
360 STRING_UNITS_10, cap_str_10, sizeof(cap_str_10));
Christoph Hellwig7a7c9242011-02-01 21:43:48 +0100361
362 dev_notice(&vdev->dev,
363 "new size: %llu %d-byte logical blocks (%s/%s)\n",
364 (unsigned long long)capacity,
365 queue_logical_block_size(q),
366 cap_str_10, cap_str_2);
367
368 set_capacity(vblk->disk, capacity);
Vivek Goyale9986f32012-03-29 10:09:44 +0200369 revalidate_disk(vblk->disk);
Milos Vyletel9d9598b2013-03-12 15:34:40 +1030370 kobject_uevent_env(&disk_to_dev(vblk->disk)->kobj, KOBJ_CHANGE, envp);
Christoph Hellwig7a7c9242011-02-01 21:43:48 +0100371}
372
373static void virtblk_config_changed(struct virtio_device *vdev)
374{
375 struct virtio_blk *vblk = vdev->priv;
376
377 queue_work(virtblk_wq, &vblk->config_work);
378}
379
Amit Shah6abd6e52011-12-22 16:58:29 +0530380static int init_vq(struct virtio_blk *vblk)
381{
382 int err = 0;
Ming Lei6a27b652014-06-26 17:41:48 +0800383 int i;
384 vq_callback_t **callbacks;
385 const char **names;
386 struct virtqueue **vqs;
387 unsigned short num_vqs;
388 struct virtio_device *vdev = vblk->vdev;
Amit Shah6abd6e52011-12-22 16:58:29 +0530389
Ming Lei6a27b652014-06-26 17:41:48 +0800390 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_MQ,
391 struct virtio_blk_config, num_queues,
392 &num_vqs);
393 if (err)
394 num_vqs = 1;
Amit Shah6abd6e52011-12-22 16:58:29 +0530395
Ming Lei6a27b652014-06-26 17:41:48 +0800396 vblk->vqs = kmalloc(sizeof(*vblk->vqs) * num_vqs, GFP_KERNEL);
397 if (!vblk->vqs) {
398 err = -ENOMEM;
399 goto out;
400 }
401
402 names = kmalloc(sizeof(*names) * num_vqs, GFP_KERNEL);
403 if (!names)
404 goto err_names;
405
406 callbacks = kmalloc(sizeof(*callbacks) * num_vqs, GFP_KERNEL);
407 if (!callbacks)
408 goto err_callbacks;
409
410 vqs = kmalloc(sizeof(*vqs) * num_vqs, GFP_KERNEL);
411 if (!vqs)
412 goto err_vqs;
413
414 for (i = 0; i < num_vqs; i++) {
415 callbacks[i] = virtblk_done;
416 snprintf(vblk->vqs[i].name, VQ_NAME_LEN, "req.%d", i);
417 names[i] = vblk->vqs[i].name;
418 }
419
420 /* Discover virtqueues and write information to configuration. */
421 err = vdev->config->find_vqs(vdev, num_vqs, vqs, callbacks, names);
422 if (err)
423 goto err_find_vqs;
424
425 for (i = 0; i < num_vqs; i++) {
426 spin_lock_init(&vblk->vqs[i].lock);
427 vblk->vqs[i].vq = vqs[i];
428 }
429 vblk->num_vqs = num_vqs;
430
431 err_find_vqs:
432 kfree(vqs);
433 err_vqs:
434 kfree(callbacks);
435 err_callbacks:
436 kfree(names);
437 err_names:
438 if (err)
439 kfree(vblk->vqs);
440 out:
Amit Shah6abd6e52011-12-22 16:58:29 +0530441 return err;
442}
443
Ren Mingxinc0aa3e02012-04-10 15:28:05 +0800444/*
445 * Legacy naming scheme used for virtio devices. We are stuck with it for
446 * virtio blk but don't ever use it for any new driver.
447 */
448static int virtblk_name_format(char *prefix, int index, char *buf, int buflen)
449{
450 const int base = 'z' - 'a' + 1;
451 char *begin = buf + strlen(prefix);
452 char *end = buf + buflen;
453 char *p;
454 int unit;
455
456 p = end - 1;
457 *p = '\0';
458 unit = base;
459 do {
460 if (p == begin)
461 return -EINVAL;
462 *--p = 'a' + (index % unit);
463 index = (index / unit) - 1;
464 } while (index >= 0);
465
466 memmove(begin, p, end - p);
467 memcpy(buf, prefix, strlen(prefix));
468
469 return 0;
470}
471
Paolo Bonzinicd5d5032012-07-03 15:19:37 +0200472static int virtblk_get_cache_mode(struct virtio_device *vdev)
473{
474 u8 writeback;
475 int err;
476
Rusty Russell855e0c52013-10-14 18:11:51 +1030477 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE,
478 struct virtio_blk_config, wce,
479 &writeback);
Michael S. Tsirkin592002f2016-02-24 17:07:27 +0200480
481 /*
482 * If WCE is not configurable and flush is not available,
483 * assume no writeback cache is in use.
484 */
Paolo Bonzinicd5d5032012-07-03 15:19:37 +0200485 if (err)
Michael S. Tsirkin592002f2016-02-24 17:07:27 +0200486 writeback = virtio_has_feature(vdev, VIRTIO_BLK_F_FLUSH);
Paolo Bonzinicd5d5032012-07-03 15:19:37 +0200487
488 return writeback;
489}
490
491static void virtblk_update_cache_mode(struct virtio_device *vdev)
492{
493 u8 writeback = virtblk_get_cache_mode(vdev);
494 struct virtio_blk *vblk = vdev->priv;
495
Asias Hec85a1f92012-08-08 16:07:05 +0800496 if (writeback)
Paolo Bonzinicd5d5032012-07-03 15:19:37 +0200497 blk_queue_flush(vblk->disk->queue, REQ_FLUSH);
498 else
499 blk_queue_flush(vblk->disk->queue, 0);
500
501 revalidate_disk(vblk->disk);
502}
503
504static const char *const virtblk_cache_types[] = {
505 "write through", "write back"
506};
507
508static ssize_t
509virtblk_cache_type_store(struct device *dev, struct device_attribute *attr,
510 const char *buf, size_t count)
511{
512 struct gendisk *disk = dev_to_disk(dev);
513 struct virtio_blk *vblk = disk->private_data;
514 struct virtio_device *vdev = vblk->vdev;
515 int i;
Paolo Bonzinicd5d5032012-07-03 15:19:37 +0200516
517 BUG_ON(!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_CONFIG_WCE));
518 for (i = ARRAY_SIZE(virtblk_cache_types); --i >= 0; )
519 if (sysfs_streq(buf, virtblk_cache_types[i]))
520 break;
521
522 if (i < 0)
523 return -EINVAL;
524
Rusty Russell855e0c52013-10-14 18:11:51 +1030525 virtio_cwrite8(vdev, offsetof(struct virtio_blk_config, wce), i);
Paolo Bonzinicd5d5032012-07-03 15:19:37 +0200526 virtblk_update_cache_mode(vdev);
527 return count;
528}
529
530static ssize_t
531virtblk_cache_type_show(struct device *dev, struct device_attribute *attr,
532 char *buf)
533{
534 struct gendisk *disk = dev_to_disk(dev);
535 struct virtio_blk *vblk = disk->private_data;
536 u8 writeback = virtblk_get_cache_mode(vblk->vdev);
537
538 BUG_ON(writeback >= ARRAY_SIZE(virtblk_cache_types));
539 return snprintf(buf, 40, "%s\n", virtblk_cache_types[writeback]);
540}
541
542static const struct device_attribute dev_attr_cache_type_ro =
543 __ATTR(cache_type, S_IRUGO,
544 virtblk_cache_type_show, NULL);
545static const struct device_attribute dev_attr_cache_type_rw =
546 __ATTR(cache_type, S_IRUGO|S_IWUSR,
547 virtblk_cache_type_show, virtblk_cache_type_store);
548
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600549static int virtblk_init_request(void *data, struct request *rq,
550 unsigned int hctx_idx, unsigned int request_idx,
551 unsigned int numa_node)
Christoph Hellwige9b267d2014-04-15 13:59:10 -0600552{
553 struct virtio_blk *vblk = data;
554 struct virtblk_req *vbr = blk_mq_rq_to_pdu(rq);
555
556 sg_init_table(vbr->sg, vblk->sg_elems);
557 return 0;
558}
559
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600560static struct blk_mq_ops virtio_mq_ops = {
561 .queue_rq = virtio_queue_rq,
562 .map_queue = blk_mq_map_queue,
Christoph Hellwig5124c282014-02-10 03:24:39 -0800563 .complete = virtblk_request_done,
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600564 .init_request = virtblk_init_request,
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600565};
566
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600567static unsigned int virtblk_queue_depth;
568module_param_named(queue_depth, virtblk_queue_depth, uint, 0444);
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600569
Greg Kroah-Hartman8d85fce2012-12-21 15:13:49 -0800570static int virtblk_probe(struct virtio_device *vdev)
Rusty Russelle467cde2007-10-22 11:03:38 +1000571{
572 struct virtio_blk *vblk;
Christoph Hellwig69740c82010-02-24 14:22:25 -0600573 struct request_queue *q;
Michael S. Tsirkin5087a502011-10-30 21:29:59 +0200574 int err, index;
Asias Hea98755c2012-08-08 16:07:04 +0800575
Rusty Russelle467cde2007-10-22 11:03:38 +1000576 u64 cap;
Christoph Hellwig69740c82010-02-24 14:22:25 -0600577 u32 v, blk_size, sg_elems, opt_io_size;
578 u16 min_io_size;
579 u8 physical_block_exp, alignment_offset;
Rusty Russelle467cde2007-10-22 11:03:38 +1000580
Michael S. Tsirkina4379fd2015-01-12 16:23:37 +0200581 if (!vdev->config->get) {
582 dev_err(&vdev->dev, "%s failure: config access disabled\n",
583 __func__);
584 return -EINVAL;
585 }
586
Michael S. Tsirkin5087a502011-10-30 21:29:59 +0200587 err = ida_simple_get(&vd_index_ida, 0, minor_to_index(1 << MINORBITS),
588 GFP_KERNEL);
589 if (err < 0)
590 goto out;
591 index = err;
Christian Borntraeger4f3bf192008-01-31 15:53:53 +0100592
Rusty Russell0864b792008-12-30 09:26:05 -0600593 /* We need to know how many segments before we allocate. */
Rusty Russell855e0c52013-10-14 18:11:51 +1030594 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SEG_MAX,
595 struct virtio_blk_config, seg_max,
596 &sg_elems);
Christoph Hellwiga5b365a2010-05-25 14:17:54 +0200597
598 /* We need at least one SG element, whatever they say. */
599 if (err || !sg_elems)
Rusty Russell0864b792008-12-30 09:26:05 -0600600 sg_elems = 1;
601
602 /* We need an extra sg elements at head and tail. */
603 sg_elems += 2;
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600604 vdev->priv = vblk = kmalloc(sizeof(*vblk), GFP_KERNEL);
Rusty Russelle467cde2007-10-22 11:03:38 +1000605 if (!vblk) {
606 err = -ENOMEM;
Michael S. Tsirkin5087a502011-10-30 21:29:59 +0200607 goto out_free_index;
Rusty Russelle467cde2007-10-22 11:03:38 +1000608 }
609
Rusty Russelle467cde2007-10-22 11:03:38 +1000610 vblk->vdev = vdev;
Rusty Russell0864b792008-12-30 09:26:05 -0600611 vblk->sg_elems = sg_elems;
Asias Hea98755c2012-08-08 16:07:04 +0800612
Christoph Hellwig7a7c9242011-02-01 21:43:48 +0100613 INIT_WORK(&vblk->config_work, virtblk_config_changed_work);
Rusty Russelle467cde2007-10-22 11:03:38 +1000614
Amit Shah6abd6e52011-12-22 16:58:29 +0530615 err = init_vq(vblk);
616 if (err)
Rusty Russelle467cde2007-10-22 11:03:38 +1000617 goto out_free_vblk;
Rusty Russelle467cde2007-10-22 11:03:38 +1000618
Rusty Russelle467cde2007-10-22 11:03:38 +1000619 /* FIXME: How many partitions? How long is a piece of string? */
Christian Borntraeger4f3bf192008-01-31 15:53:53 +0100620 vblk->disk = alloc_disk(1 << PART_BITS);
Rusty Russelle467cde2007-10-22 11:03:38 +1000621 if (!vblk->disk) {
622 err = -ENOMEM;
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600623 goto out_free_vq;
Rusty Russelle467cde2007-10-22 11:03:38 +1000624 }
625
Rusty Russellfc4324b2014-03-19 17:08:24 +1030626 /* Default queue sizing is to fill the ring. */
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600627 if (!virtblk_queue_depth) {
Ming Lei6a27b652014-06-26 17:41:48 +0800628 virtblk_queue_depth = vblk->vqs[0].vq->num_free;
Rusty Russellfc4324b2014-03-19 17:08:24 +1030629 /* ... but without indirect descs, we use 2 descs per req */
630 if (!virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC))
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600631 virtblk_queue_depth /= 2;
Rusty Russellfc4324b2014-03-19 17:08:24 +1030632 }
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600633
634 memset(&vblk->tag_set, 0, sizeof(vblk->tag_set));
635 vblk->tag_set.ops = &virtio_mq_ops;
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600636 vblk->tag_set.queue_depth = virtblk_queue_depth;
637 vblk->tag_set.numa_node = NUMA_NO_NODE;
638 vblk->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
639 vblk->tag_set.cmd_size =
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600640 sizeof(struct virtblk_req) +
641 sizeof(struct scatterlist) * sg_elems;
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600642 vblk->tag_set.driver_data = vblk;
Ming Lei6a27b652014-06-26 17:41:48 +0800643 vblk->tag_set.nr_hw_queues = vblk->num_vqs;
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600644
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600645 err = blk_mq_alloc_tag_set(&vblk->tag_set);
646 if (err)
647 goto out_put_disk;
648
649 q = vblk->disk->queue = blk_mq_init_queue(&vblk->tag_set);
Ming Lei35b489d2015-01-02 14:25:27 +0000650 if (IS_ERR(q)) {
Rusty Russelle467cde2007-10-22 11:03:38 +1000651 err = -ENOMEM;
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600652 goto out_free_tags;
Rusty Russelle467cde2007-10-22 11:03:38 +1000653 }
654
Christoph Hellwig69740c82010-02-24 14:22:25 -0600655 q->queuedata = vblk;
Fernando Luis Vázquez Cao7d116b62008-10-27 18:45:15 +0900656
Ren Mingxinc0aa3e02012-04-10 15:28:05 +0800657 virtblk_name_format("vd", index, vblk->disk->disk_name, DISK_NAME_LEN);
Christian Borntraegerd50ed902008-02-01 09:05:00 +0100658
Rusty Russelle467cde2007-10-22 11:03:38 +1000659 vblk->disk->major = major;
Christian Borntraegerd50ed902008-02-01 09:05:00 +0100660 vblk->disk->first_minor = index_to_minor(index);
Rusty Russelle467cde2007-10-22 11:03:38 +1000661 vblk->disk->private_data = vblk;
662 vblk->disk->fops = &virtblk_fops;
Jeremy Katzc4839342008-03-02 17:00:15 -0500663 vblk->disk->driverfs_dev = &vdev->dev;
Fam Zheng5fa31422015-09-06 17:05:42 +0800664 vblk->disk->flags |= GENHD_FL_EXT_DEVT;
Michael S. Tsirkin5087a502011-10-30 21:29:59 +0200665 vblk->index = index;
Christian Borntraeger4f3bf192008-01-31 15:53:53 +0100666
Tejun Heo02c42b72010-09-03 11:56:18 +0200667 /* configure queue flush support */
Paolo Bonzinicd5d5032012-07-03 15:19:37 +0200668 virtblk_update_cache_mode(vdev);
Rusty Russelle467cde2007-10-22 11:03:38 +1000669
Christian Borntraeger3ef53602008-05-16 11:17:03 +0200670 /* If disk is read-only in the host, the guest should obey */
671 if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO))
672 set_disk_ro(vblk->disk, 1);
673
Rusty Russella586d4f2008-02-04 23:49:56 -0500674 /* Host must always specify the capacity. */
Rusty Russell855e0c52013-10-14 18:11:51 +1030675 virtio_cread(vdev, struct virtio_blk_config, capacity, &cap);
Rusty Russelle467cde2007-10-22 11:03:38 +1000676
677 /* If capacity is too big, truncate with warning. */
678 if ((sector_t)cap != cap) {
679 dev_warn(&vdev->dev, "Capacity %llu too large: truncating\n",
680 (unsigned long long)cap);
681 cap = (sector_t)-1;
682 }
683 set_capacity(vblk->disk, cap);
684
Rusty Russell0864b792008-12-30 09:26:05 -0600685 /* We can handle whatever the host told us to handle. */
Martin K. Petersenee714f22010-03-10 00:48:32 -0500686 blk_queue_max_segments(q, vblk->sg_elems-2);
Rusty Russell0864b792008-12-30 09:26:05 -0600687
Christoph Hellwig4eff3ca2009-07-17 21:47:45 -0600688 /* No need to bounce any requests */
Christoph Hellwig69740c82010-02-24 14:22:25 -0600689 blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
Christoph Hellwig4eff3ca2009-07-17 21:47:45 -0600690
Rusty Russell4b7f7e22008-12-30 09:26:04 -0600691 /* No real sector limit. */
Martin K. Petersenee714f22010-03-10 00:48:32 -0500692 blk_queue_max_hw_sectors(q, -1U);
Rusty Russell4b7f7e22008-12-30 09:26:04 -0600693
Rusty Russella586d4f2008-02-04 23:49:56 -0500694 /* Host can optionally specify maximum segment size and number of
695 * segments. */
Rusty Russell855e0c52013-10-14 18:11:51 +1030696 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SIZE_MAX,
697 struct virtio_blk_config, size_max, &v);
Rusty Russelle467cde2007-10-22 11:03:38 +1000698 if (!err)
Christoph Hellwig69740c82010-02-24 14:22:25 -0600699 blk_queue_max_segment_size(q, v);
Rusty Russell4b7f7e22008-12-30 09:26:04 -0600700 else
Christoph Hellwig69740c82010-02-24 14:22:25 -0600701 blk_queue_max_segment_size(q, -1U);
Rusty Russelle467cde2007-10-22 11:03:38 +1000702
Christian Borntraeger066f4d82008-05-29 11:08:26 +0200703 /* Host can optionally specify the block size of the device */
Rusty Russell855e0c52013-10-14 18:11:51 +1030704 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_BLK_SIZE,
705 struct virtio_blk_config, blk_size,
706 &blk_size);
Christian Borntraeger066f4d82008-05-29 11:08:26 +0200707 if (!err)
Christoph Hellwig69740c82010-02-24 14:22:25 -0600708 blk_queue_logical_block_size(q, blk_size);
709 else
710 blk_size = queue_logical_block_size(q);
711
712 /* Use topology information if available */
Rusty Russell855e0c52013-10-14 18:11:51 +1030713 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
714 struct virtio_blk_config, physical_block_exp,
715 &physical_block_exp);
Christoph Hellwig69740c82010-02-24 14:22:25 -0600716 if (!err && physical_block_exp)
717 blk_queue_physical_block_size(q,
718 blk_size * (1 << physical_block_exp));
719
Rusty Russell855e0c52013-10-14 18:11:51 +1030720 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
721 struct virtio_blk_config, alignment_offset,
722 &alignment_offset);
Christoph Hellwig69740c82010-02-24 14:22:25 -0600723 if (!err && alignment_offset)
724 blk_queue_alignment_offset(q, blk_size * alignment_offset);
725
Rusty Russell855e0c52013-10-14 18:11:51 +1030726 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
727 struct virtio_blk_config, min_io_size,
728 &min_io_size);
Christoph Hellwig69740c82010-02-24 14:22:25 -0600729 if (!err && min_io_size)
730 blk_queue_io_min(q, blk_size * min_io_size);
731
Rusty Russell855e0c52013-10-14 18:11:51 +1030732 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
733 struct virtio_blk_config, opt_io_size,
734 &opt_io_size);
Christoph Hellwig69740c82010-02-24 14:22:25 -0600735 if (!err && opt_io_size)
736 blk_queue_io_opt(q, blk_size * opt_io_size);
737
Michael S. Tsirkin7a113702014-10-15 10:22:30 +1030738 virtio_device_ready(vdev);
739
Rusty Russelle467cde2007-10-22 11:03:38 +1000740 add_disk(vblk->disk);
Ryan Harpera5eb9e42010-06-23 22:19:57 -0500741 err = device_create_file(disk_to_dev(vblk->disk), &dev_attr_serial);
742 if (err)
743 goto out_del_disk;
744
Paolo Bonzinicd5d5032012-07-03 15:19:37 +0200745 if (virtio_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE))
746 err = device_create_file(disk_to_dev(vblk->disk),
747 &dev_attr_cache_type_rw);
748 else
749 err = device_create_file(disk_to_dev(vblk->disk),
750 &dev_attr_cache_type_ro);
751 if (err)
752 goto out_del_disk;
Rusty Russelle467cde2007-10-22 11:03:38 +1000753 return 0;
754
Ryan Harpera5eb9e42010-06-23 22:19:57 -0500755out_del_disk:
756 del_gendisk(vblk->disk);
757 blk_cleanup_queue(vblk->disk->queue);
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600758out_free_tags:
759 blk_mq_free_tag_set(&vblk->tag_set);
Rusty Russelle467cde2007-10-22 11:03:38 +1000760out_put_disk:
761 put_disk(vblk->disk);
Rusty Russelle467cde2007-10-22 11:03:38 +1000762out_free_vq:
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -0600763 vdev->config->del_vqs(vdev);
Rusty Russelle467cde2007-10-22 11:03:38 +1000764out_free_vblk:
765 kfree(vblk);
Michael S. Tsirkin5087a502011-10-30 21:29:59 +0200766out_free_index:
767 ida_simple_remove(&vd_index_ida, index);
Rusty Russelle467cde2007-10-22 11:03:38 +1000768out:
769 return err;
770}
771
Greg Kroah-Hartman8d85fce2012-12-21 15:13:49 -0800772static void virtblk_remove(struct virtio_device *vdev)
Rusty Russelle467cde2007-10-22 11:03:38 +1000773{
774 struct virtio_blk *vblk = vdev->priv;
Michael S. Tsirkin5087a502011-10-30 21:29:59 +0200775 int index = vblk->index;
Alexander Graff4953fe2013-01-02 15:37:17 +1030776 int refc;
Rusty Russelle467cde2007-10-22 11:03:38 +1000777
Michael S. Tsirkincc74f712014-10-15 10:22:26 +1030778 /* Make sure no work handler is accessing the device. */
779 flush_work(&vblk->config_work);
Christoph Hellwig7a7c9242011-02-01 21:43:48 +0100780
Asias He02e2b122012-05-25 10:34:47 +0800781 del_gendisk(vblk->disk);
Asias He483001c2012-05-25 10:34:48 +0800782 blk_cleanup_queue(vblk->disk->queue);
Asias He02e2b122012-05-25 10:34:47 +0800783
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600784 blk_mq_free_tag_set(&vblk->tag_set);
785
Rusty Russell6e5aa7e2008-02-04 23:50:03 -0500786 /* Stop all the virtqueues. */
787 vdev->config->reset(vdev);
788
Alexander Graff4953fe2013-01-02 15:37:17 +1030789 refc = atomic_read(&disk_to_dev(vblk->disk)->kobj.kref.refcount);
Rusty Russelle467cde2007-10-22 11:03:38 +1000790 put_disk(vblk->disk);
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -0600791 vdev->config->del_vqs(vdev);
Ming Lei6a27b652014-06-26 17:41:48 +0800792 kfree(vblk->vqs);
Rusty Russelle467cde2007-10-22 11:03:38 +1000793 kfree(vblk);
Alexander Graff4953fe2013-01-02 15:37:17 +1030794
795 /* Only free device id if we don't have any users */
796 if (refc == 1)
797 ida_simple_remove(&vd_index_ida, index);
Rusty Russelle467cde2007-10-22 11:03:38 +1000798}
799
Aaron Lu89107002013-09-17 09:25:23 +0930800#ifdef CONFIG_PM_SLEEP
Amit Shahf8fb5bc2011-12-22 16:58:30 +0530801static int virtblk_freeze(struct virtio_device *vdev)
802{
803 struct virtio_blk *vblk = vdev->priv;
804
805 /* Ensure we don't receive any more interrupts */
806 vdev->config->reset(vdev);
807
Michael S. Tsirkincc74f712014-10-15 10:22:26 +1030808 /* Make sure no work handler is accessing the device. */
Amit Shahf8fb5bc2011-12-22 16:58:30 +0530809 flush_work(&vblk->config_work);
810
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600811 blk_mq_stop_hw_queues(vblk->disk->queue);
Amit Shahf8fb5bc2011-12-22 16:58:30 +0530812
813 vdev->config->del_vqs(vdev);
814 return 0;
815}
816
817static int virtblk_restore(struct virtio_device *vdev)
818{
819 struct virtio_blk *vblk = vdev->priv;
820 int ret;
821
Amit Shahf8fb5bc2011-12-22 16:58:30 +0530822 ret = init_vq(vdev->priv);
Michael S. Tsirkin6d62c372014-10-15 10:22:32 +1030823 if (ret)
824 return ret;
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600825
Michael S. Tsirkin6d62c372014-10-15 10:22:32 +1030826 virtio_device_ready(vdev);
827
828 blk_mq_start_stopped_hw_queues(vblk->disk->queue, true);
829 return 0;
Amit Shahf8fb5bc2011-12-22 16:58:30 +0530830}
831#endif
832
Márton Németh47483e22010-01-10 13:40:02 +0100833static const struct virtio_device_id id_table[] = {
Rusty Russelle467cde2007-10-22 11:03:38 +1000834 { VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID },
835 { 0 },
836};
837
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +0200838static unsigned int features_legacy[] = {
Tejun Heo02c42b72010-09-03 11:56:18 +0200839 VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY,
840 VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, VIRTIO_BLK_F_SCSI,
Michael S. Tsirkin592002f2016-02-24 17:07:27 +0200841 VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE,
Ming Lei6a27b652014-06-26 17:41:48 +0800842 VIRTIO_BLK_F_MQ,
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +0200843}
844;
845static unsigned int features[] = {
846 VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY,
847 VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE,
Michael S. Tsirkin592002f2016-02-24 17:07:27 +0200848 VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE,
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +0200849 VIRTIO_BLK_F_MQ,
Rusty Russellc45a6812008-05-02 21:50:50 -0500850};
851
Greg Kroah-Hartman8d85fce2012-12-21 15:13:49 -0800852static struct virtio_driver virtio_blk = {
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +0200853 .feature_table = features,
854 .feature_table_size = ARRAY_SIZE(features),
855 .feature_table_legacy = features_legacy,
856 .feature_table_size_legacy = ARRAY_SIZE(features_legacy),
857 .driver.name = KBUILD_MODNAME,
858 .driver.owner = THIS_MODULE,
859 .id_table = id_table,
860 .probe = virtblk_probe,
861 .remove = virtblk_remove,
862 .config_changed = virtblk_config_changed,
Aaron Lu89107002013-09-17 09:25:23 +0930863#ifdef CONFIG_PM_SLEEP
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +0200864 .freeze = virtblk_freeze,
865 .restore = virtblk_restore,
Amit Shahf8fb5bc2011-12-22 16:58:30 +0530866#endif
Rusty Russelle467cde2007-10-22 11:03:38 +1000867};
868
869static int __init init(void)
870{
Christoph Hellwig7a7c9242011-02-01 21:43:48 +0100871 int error;
872
873 virtblk_wq = alloc_workqueue("virtio-blk", 0, 0);
874 if (!virtblk_wq)
875 return -ENOMEM;
876
Christian Borntraeger4f3bf192008-01-31 15:53:53 +0100877 major = register_blkdev(0, "virtblk");
Christoph Hellwig7a7c9242011-02-01 21:43:48 +0100878 if (major < 0) {
879 error = major;
880 goto out_destroy_workqueue;
881 }
882
883 error = register_virtio_driver(&virtio_blk);
884 if (error)
885 goto out_unregister_blkdev;
886 return 0;
887
888out_unregister_blkdev:
889 unregister_blkdev(major, "virtblk");
890out_destroy_workqueue:
891 destroy_workqueue(virtblk_wq);
892 return error;
Rusty Russelle467cde2007-10-22 11:03:38 +1000893}
894
895static void __exit fini(void)
896{
Rusty Russelle467cde2007-10-22 11:03:38 +1000897 unregister_virtio_driver(&virtio_blk);
Michael S. Tsirkin38f37b52014-10-23 18:57:19 +0300898 unregister_blkdev(major, "virtblk");
Christoph Hellwig7a7c9242011-02-01 21:43:48 +0100899 destroy_workqueue(virtblk_wq);
Rusty Russelle467cde2007-10-22 11:03:38 +1000900}
901module_init(init);
902module_exit(fini);
903
904MODULE_DEVICE_TABLE(virtio, id_table);
905MODULE_DESCRIPTION("Virtio block driver");
906MODULE_LICENSE("GPL");