blob: 2dc5c96c186aa3455ea124aa2bb824e889e1e15f [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;
Mike Christie3a5e02c2016-06-05 14:32:23 -0500175 if (req_op(req) == REQ_OP_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;
Christoph Hellwigf9596692016-07-19 11:31:49 +0200239 struct request_queue *q = vblk->disk->queue;
john cooper4cb2ea22010-03-25 01:33:33 -0400240 struct request *req;
Mike Snitzere4c47762010-10-09 12:12:13 +1030241 int err;
john cooper4cb2ea22010-03-25 01:33:33 -0400242
Christoph Hellwigf9596692016-07-19 11:31:49 +0200243 req = blk_get_request(q, READ, GFP_KERNEL);
244 if (IS_ERR(req))
john cooper4cb2ea22010-03-25 01:33:33 -0400245 return PTR_ERR(req);
Christoph Hellwig4f8c9512015-04-17 22:37:16 +0200246 req->cmd_type = REQ_TYPE_DRV_PRIV;
Mike Snitzere4c47762010-10-09 12:12:13 +1030247
Christoph Hellwigf9596692016-07-19 11:31:49 +0200248 err = blk_rq_map_kern(q, req, id_str, VIRTIO_BLK_ID_BYTES, GFP_KERNEL);
249 if (err)
250 goto out;
251
252 err = blk_execute_rq(vblk->disk->queue, vblk->disk, req, false);
253out:
254 blk_put_request(req);
Mike Snitzere4c47762010-10-09 12:12:13 +1030255 return err;
john cooper4cb2ea22010-03-25 01:33:33 -0400256}
257
Christoph Hellwigfe5a50a2010-09-15 01:27:23 +0200258static int virtblk_ioctl(struct block_device *bdev, fmode_t mode,
259 unsigned int cmd, unsigned long data)
Rusty Russelle467cde2007-10-22 11:03:38 +1000260{
Hannes Reinecke1cde26f2009-05-18 14:41:30 +0200261 struct gendisk *disk = bdev->bd_disk;
262 struct virtio_blk *vblk = disk->private_data;
263
264 /*
265 * Only allow the generic SCSI ioctls if the host can support it.
266 */
267 if (!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_SCSI))
Christoph Hellwigd9ecdea2009-06-20 21:29:41 +0200268 return -ENOTTY;
Hannes Reinecke1cde26f2009-05-18 14:41:30 +0200269
Paolo Bonzini577ebb32012-01-12 16:01:27 +0100270 return scsi_cmd_blk_ioctl(bdev, mode, cmd,
271 (void __user *)data);
Rusty Russelle467cde2007-10-22 11:03:38 +1000272}
273
Christian Borntraeger135da0b2008-01-23 17:56:50 +0100274/* We provide getgeo only to please some old bootloader/partitioning tools */
275static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
276{
Ryan Harper48e40432008-04-16 13:56:37 -0500277 struct virtio_blk *vblk = bd->bd_disk->private_data;
Ryan Harper48e40432008-04-16 13:56:37 -0500278
279 /* see if the host passed in geometry config */
Rusty Russell855e0c52013-10-14 18:11:51 +1030280 if (virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_GEOMETRY)) {
281 virtio_cread(vblk->vdev, struct virtio_blk_config,
282 geometry.cylinders, &geo->cylinders);
283 virtio_cread(vblk->vdev, struct virtio_blk_config,
284 geometry.heads, &geo->heads);
285 virtio_cread(vblk->vdev, struct virtio_blk_config,
286 geometry.sectors, &geo->sectors);
Ryan Harper48e40432008-04-16 13:56:37 -0500287 } else {
288 /* some standard values, similar to sd */
289 geo->heads = 1 << 6;
290 geo->sectors = 1 << 5;
291 geo->cylinders = get_capacity(bd->bd_disk) >> 11;
292 }
Christian Borntraeger135da0b2008-01-23 17:56:50 +0100293 return 0;
294}
295
Alexey Dobriyan83d5cde2009-09-21 17:01:13 -0700296static const struct block_device_operations virtblk_fops = {
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200297 .ioctl = virtblk_ioctl,
Christian Borntraeger135da0b2008-01-23 17:56:50 +0100298 .owner = THIS_MODULE,
299 .getgeo = virtblk_getgeo,
Rusty Russelle467cde2007-10-22 11:03:38 +1000300};
301
Christian Borntraegerd50ed902008-02-01 09:05:00 +0100302static int index_to_minor(int index)
303{
304 return index << PART_BITS;
305}
306
Michael S. Tsirkin5087a502011-10-30 21:29:59 +0200307static int minor_to_index(int minor)
308{
309 return minor >> PART_BITS;
310}
311
Ryan Harpera5eb9e42010-06-23 22:19:57 -0500312static ssize_t virtblk_serial_show(struct device *dev,
313 struct device_attribute *attr, char *buf)
314{
315 struct gendisk *disk = dev_to_disk(dev);
316 int err;
317
318 /* sysfs gives us a PAGE_SIZE buffer */
319 BUILD_BUG_ON(PAGE_SIZE < VIRTIO_BLK_ID_BYTES);
320
321 buf[VIRTIO_BLK_ID_BYTES] = '\0';
322 err = virtblk_get_id(disk, buf);
323 if (!err)
324 return strlen(buf);
325
326 if (err == -EIO) /* Unsupported? Make it empty. */
327 return 0;
328
329 return err;
330}
Michael S. Tsirkin393c5252014-10-23 16:08:44 +0300331
332static DEVICE_ATTR(serial, S_IRUGO, virtblk_serial_show, NULL);
Ryan Harpera5eb9e42010-06-23 22:19:57 -0500333
Christoph Hellwig7a7c9242011-02-01 21:43:48 +0100334static void virtblk_config_changed_work(struct work_struct *work)
335{
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];
Milos Vyletel9d9598b2013-03-12 15:34:40 +1030341 char *envp[] = { "RESIZE=1", NULL };
James Bottomleyb9f28d82015-03-05 18:47:01 -0800342 u64 capacity;
Christoph Hellwig7a7c9242011-02-01 21:43:48 +0100343
344 /* Host must always specify the capacity. */
Rusty Russell855e0c52013-10-14 18:11:51 +1030345 virtio_cread(vdev, struct virtio_blk_config, capacity, &capacity);
Christoph Hellwig7a7c9242011-02-01 21:43:48 +0100346
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;
352 }
353
James Bottomleyb9f28d82015-03-05 18:47:01 -0800354 string_get_size(capacity, queue_logical_block_size(q),
355 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
356 string_get_size(capacity, queue_logical_block_size(q),
357 STRING_UNITS_10, cap_str_10, sizeof(cap_str_10));
Christoph Hellwig7a7c9242011-02-01 21:43:48 +0100358
359 dev_notice(&vdev->dev,
360 "new size: %llu %d-byte logical blocks (%s/%s)\n",
361 (unsigned long long)capacity,
362 queue_logical_block_size(q),
363 cap_str_10, cap_str_2);
364
365 set_capacity(vblk->disk, capacity);
Vivek Goyale9986f32012-03-29 10:09:44 +0200366 revalidate_disk(vblk->disk);
Milos Vyletel9d9598b2013-03-12 15:34:40 +1030367 kobject_uevent_env(&disk_to_dev(vblk->disk)->kobj, KOBJ_CHANGE, envp);
Christoph Hellwig7a7c9242011-02-01 21:43:48 +0100368}
369
370static void virtblk_config_changed(struct virtio_device *vdev)
371{
372 struct virtio_blk *vblk = vdev->priv;
373
374 queue_work(virtblk_wq, &vblk->config_work);
375}
376
Amit Shah6abd6e52011-12-22 16:58:29 +0530377static int init_vq(struct virtio_blk *vblk)
378{
379 int err = 0;
Ming Lei6a27b652014-06-26 17:41:48 +0800380 int i;
381 vq_callback_t **callbacks;
382 const char **names;
383 struct virtqueue **vqs;
384 unsigned short num_vqs;
385 struct virtio_device *vdev = vblk->vdev;
Amit Shah6abd6e52011-12-22 16:58:29 +0530386
Ming Lei6a27b652014-06-26 17:41:48 +0800387 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_MQ,
388 struct virtio_blk_config, num_queues,
389 &num_vqs);
390 if (err)
391 num_vqs = 1;
Amit Shah6abd6e52011-12-22 16:58:29 +0530392
Ming Lei6a27b652014-06-26 17:41:48 +0800393 vblk->vqs = kmalloc(sizeof(*vblk->vqs) * num_vqs, GFP_KERNEL);
Minfei Huang347a5292016-08-09 16:39:20 +0800394 if (!vblk->vqs)
395 return -ENOMEM;
396
397 names = kmalloc(sizeof(*names) * num_vqs, GFP_KERNEL);
398 callbacks = kmalloc(sizeof(*callbacks) * num_vqs, GFP_KERNEL);
399 vqs = kmalloc(sizeof(*vqs) * num_vqs, GFP_KERNEL);
400 if (!names || !callbacks || !vqs) {
Ming Lei6a27b652014-06-26 17:41:48 +0800401 err = -ENOMEM;
402 goto out;
403 }
404
Ming Lei6a27b652014-06-26 17:41:48 +0800405 for (i = 0; i < num_vqs; i++) {
406 callbacks[i] = virtblk_done;
407 snprintf(vblk->vqs[i].name, VQ_NAME_LEN, "req.%d", i);
408 names[i] = vblk->vqs[i].name;
409 }
410
411 /* Discover virtqueues and write information to configuration. */
412 err = vdev->config->find_vqs(vdev, num_vqs, vqs, callbacks, names);
413 if (err)
Minfei Huang347a5292016-08-09 16:39:20 +0800414 goto out;
Ming Lei6a27b652014-06-26 17:41:48 +0800415
416 for (i = 0; i < num_vqs; i++) {
417 spin_lock_init(&vblk->vqs[i].lock);
418 vblk->vqs[i].vq = vqs[i];
419 }
420 vblk->num_vqs = num_vqs;
421
Minfei Huang347a5292016-08-09 16:39:20 +0800422out:
Ming Lei6a27b652014-06-26 17:41:48 +0800423 kfree(vqs);
Ming Lei6a27b652014-06-26 17:41:48 +0800424 kfree(callbacks);
Ming Lei6a27b652014-06-26 17:41:48 +0800425 kfree(names);
Ming Lei6a27b652014-06-26 17:41:48 +0800426 if (err)
427 kfree(vblk->vqs);
Amit Shah6abd6e52011-12-22 16:58:29 +0530428 return err;
429}
430
Ren Mingxinc0aa3e02012-04-10 15:28:05 +0800431/*
432 * Legacy naming scheme used for virtio devices. We are stuck with it for
433 * virtio blk but don't ever use it for any new driver.
434 */
435static int virtblk_name_format(char *prefix, int index, char *buf, int buflen)
436{
437 const int base = 'z' - 'a' + 1;
438 char *begin = buf + strlen(prefix);
439 char *end = buf + buflen;
440 char *p;
441 int unit;
442
443 p = end - 1;
444 *p = '\0';
445 unit = base;
446 do {
447 if (p == begin)
448 return -EINVAL;
449 *--p = 'a' + (index % unit);
450 index = (index / unit) - 1;
451 } while (index >= 0);
452
453 memmove(begin, p, end - p);
454 memcpy(buf, prefix, strlen(prefix));
455
456 return 0;
457}
458
Paolo Bonzinicd5d5032012-07-03 15:19:37 +0200459static int virtblk_get_cache_mode(struct virtio_device *vdev)
460{
461 u8 writeback;
462 int err;
463
Rusty Russell855e0c52013-10-14 18:11:51 +1030464 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE,
465 struct virtio_blk_config, wce,
466 &writeback);
Michael S. Tsirkin592002f2016-02-24 17:07:27 +0200467
468 /*
469 * If WCE is not configurable and flush is not available,
470 * assume no writeback cache is in use.
471 */
Paolo Bonzinicd5d5032012-07-03 15:19:37 +0200472 if (err)
Michael S. Tsirkin592002f2016-02-24 17:07:27 +0200473 writeback = virtio_has_feature(vdev, VIRTIO_BLK_F_FLUSH);
Paolo Bonzinicd5d5032012-07-03 15:19:37 +0200474
475 return writeback;
476}
477
478static void virtblk_update_cache_mode(struct virtio_device *vdev)
479{
480 u8 writeback = virtblk_get_cache_mode(vdev);
481 struct virtio_blk *vblk = vdev->priv;
482
Jens Axboead9126a2016-03-30 10:12:58 -0600483 blk_queue_write_cache(vblk->disk->queue, writeback, false);
Paolo Bonzinicd5d5032012-07-03 15:19:37 +0200484 revalidate_disk(vblk->disk);
485}
486
487static const char *const virtblk_cache_types[] = {
488 "write through", "write back"
489};
490
491static ssize_t
492virtblk_cache_type_store(struct device *dev, struct device_attribute *attr,
493 const char *buf, size_t count)
494{
495 struct gendisk *disk = dev_to_disk(dev);
496 struct virtio_blk *vblk = disk->private_data;
497 struct virtio_device *vdev = vblk->vdev;
498 int i;
Paolo Bonzinicd5d5032012-07-03 15:19:37 +0200499
500 BUG_ON(!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_CONFIG_WCE));
501 for (i = ARRAY_SIZE(virtblk_cache_types); --i >= 0; )
502 if (sysfs_streq(buf, virtblk_cache_types[i]))
503 break;
504
505 if (i < 0)
506 return -EINVAL;
507
Rusty Russell855e0c52013-10-14 18:11:51 +1030508 virtio_cwrite8(vdev, offsetof(struct virtio_blk_config, wce), i);
Paolo Bonzinicd5d5032012-07-03 15:19:37 +0200509 virtblk_update_cache_mode(vdev);
510 return count;
511}
512
513static ssize_t
514virtblk_cache_type_show(struct device *dev, struct device_attribute *attr,
515 char *buf)
516{
517 struct gendisk *disk = dev_to_disk(dev);
518 struct virtio_blk *vblk = disk->private_data;
519 u8 writeback = virtblk_get_cache_mode(vblk->vdev);
520
521 BUG_ON(writeback >= ARRAY_SIZE(virtblk_cache_types));
522 return snprintf(buf, 40, "%s\n", virtblk_cache_types[writeback]);
523}
524
525static const struct device_attribute dev_attr_cache_type_ro =
526 __ATTR(cache_type, S_IRUGO,
527 virtblk_cache_type_show, NULL);
528static const struct device_attribute dev_attr_cache_type_rw =
529 __ATTR(cache_type, S_IRUGO|S_IWUSR,
530 virtblk_cache_type_show, virtblk_cache_type_store);
531
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600532static int virtblk_init_request(void *data, struct request *rq,
533 unsigned int hctx_idx, unsigned int request_idx,
534 unsigned int numa_node)
Christoph Hellwige9b267d2014-04-15 13:59:10 -0600535{
536 struct virtio_blk *vblk = data;
537 struct virtblk_req *vbr = blk_mq_rq_to_pdu(rq);
538
539 sg_init_table(vbr->sg, vblk->sg_elems);
540 return 0;
541}
542
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600543static struct blk_mq_ops virtio_mq_ops = {
544 .queue_rq = virtio_queue_rq,
Christoph Hellwig5124c282014-02-10 03:24:39 -0800545 .complete = virtblk_request_done,
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600546 .init_request = virtblk_init_request,
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600547};
548
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600549static unsigned int virtblk_queue_depth;
550module_param_named(queue_depth, virtblk_queue_depth, uint, 0444);
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600551
Greg Kroah-Hartman8d85fce2012-12-21 15:13:49 -0800552static int virtblk_probe(struct virtio_device *vdev)
Rusty Russelle467cde2007-10-22 11:03:38 +1000553{
554 struct virtio_blk *vblk;
Christoph Hellwig69740c82010-02-24 14:22:25 -0600555 struct request_queue *q;
Michael S. Tsirkin5087a502011-10-30 21:29:59 +0200556 int err, index;
Asias Hea98755c2012-08-08 16:07:04 +0800557
Rusty Russelle467cde2007-10-22 11:03:38 +1000558 u64 cap;
Christoph Hellwig69740c82010-02-24 14:22:25 -0600559 u32 v, blk_size, sg_elems, opt_io_size;
560 u16 min_io_size;
561 u8 physical_block_exp, alignment_offset;
Rusty Russelle467cde2007-10-22 11:03:38 +1000562
Michael S. Tsirkina4379fd2015-01-12 16:23:37 +0200563 if (!vdev->config->get) {
564 dev_err(&vdev->dev, "%s failure: config access disabled\n",
565 __func__);
566 return -EINVAL;
567 }
568
Michael S. Tsirkin5087a502011-10-30 21:29:59 +0200569 err = ida_simple_get(&vd_index_ida, 0, minor_to_index(1 << MINORBITS),
570 GFP_KERNEL);
571 if (err < 0)
572 goto out;
573 index = err;
Christian Borntraeger4f3bf192008-01-31 15:53:53 +0100574
Rusty Russell0864b792008-12-30 09:26:05 -0600575 /* We need to know how many segments before we allocate. */
Rusty Russell855e0c52013-10-14 18:11:51 +1030576 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SEG_MAX,
577 struct virtio_blk_config, seg_max,
578 &sg_elems);
Christoph Hellwiga5b365a2010-05-25 14:17:54 +0200579
580 /* We need at least one SG element, whatever they say. */
581 if (err || !sg_elems)
Rusty Russell0864b792008-12-30 09:26:05 -0600582 sg_elems = 1;
583
584 /* We need an extra sg elements at head and tail. */
585 sg_elems += 2;
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600586 vdev->priv = vblk = kmalloc(sizeof(*vblk), GFP_KERNEL);
Rusty Russelle467cde2007-10-22 11:03:38 +1000587 if (!vblk) {
588 err = -ENOMEM;
Michael S. Tsirkin5087a502011-10-30 21:29:59 +0200589 goto out_free_index;
Rusty Russelle467cde2007-10-22 11:03:38 +1000590 }
591
Rusty Russelle467cde2007-10-22 11:03:38 +1000592 vblk->vdev = vdev;
Rusty Russell0864b792008-12-30 09:26:05 -0600593 vblk->sg_elems = sg_elems;
Asias Hea98755c2012-08-08 16:07:04 +0800594
Christoph Hellwig7a7c9242011-02-01 21:43:48 +0100595 INIT_WORK(&vblk->config_work, virtblk_config_changed_work);
Rusty Russelle467cde2007-10-22 11:03:38 +1000596
Amit Shah6abd6e52011-12-22 16:58:29 +0530597 err = init_vq(vblk);
598 if (err)
Rusty Russelle467cde2007-10-22 11:03:38 +1000599 goto out_free_vblk;
Rusty Russelle467cde2007-10-22 11:03:38 +1000600
Rusty Russelle467cde2007-10-22 11:03:38 +1000601 /* FIXME: How many partitions? How long is a piece of string? */
Christian Borntraeger4f3bf192008-01-31 15:53:53 +0100602 vblk->disk = alloc_disk(1 << PART_BITS);
Rusty Russelle467cde2007-10-22 11:03:38 +1000603 if (!vblk->disk) {
604 err = -ENOMEM;
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600605 goto out_free_vq;
Rusty Russelle467cde2007-10-22 11:03:38 +1000606 }
607
Rusty Russellfc4324b2014-03-19 17:08:24 +1030608 /* Default queue sizing is to fill the ring. */
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600609 if (!virtblk_queue_depth) {
Ming Lei6a27b652014-06-26 17:41:48 +0800610 virtblk_queue_depth = vblk->vqs[0].vq->num_free;
Rusty Russellfc4324b2014-03-19 17:08:24 +1030611 /* ... but without indirect descs, we use 2 descs per req */
612 if (!virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC))
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600613 virtblk_queue_depth /= 2;
Rusty Russellfc4324b2014-03-19 17:08:24 +1030614 }
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600615
616 memset(&vblk->tag_set, 0, sizeof(vblk->tag_set));
617 vblk->tag_set.ops = &virtio_mq_ops;
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600618 vblk->tag_set.queue_depth = virtblk_queue_depth;
619 vblk->tag_set.numa_node = NUMA_NO_NODE;
620 vblk->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
621 vblk->tag_set.cmd_size =
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600622 sizeof(struct virtblk_req) +
623 sizeof(struct scatterlist) * sg_elems;
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600624 vblk->tag_set.driver_data = vblk;
Ming Lei6a27b652014-06-26 17:41:48 +0800625 vblk->tag_set.nr_hw_queues = vblk->num_vqs;
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600626
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600627 err = blk_mq_alloc_tag_set(&vblk->tag_set);
628 if (err)
629 goto out_put_disk;
630
631 q = vblk->disk->queue = blk_mq_init_queue(&vblk->tag_set);
Ming Lei35b489d2015-01-02 14:25:27 +0000632 if (IS_ERR(q)) {
Rusty Russelle467cde2007-10-22 11:03:38 +1000633 err = -ENOMEM;
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600634 goto out_free_tags;
Rusty Russelle467cde2007-10-22 11:03:38 +1000635 }
636
Christoph Hellwig69740c82010-02-24 14:22:25 -0600637 q->queuedata = vblk;
Fernando Luis Vázquez Cao7d116b62008-10-27 18:45:15 +0900638
Ren Mingxinc0aa3e02012-04-10 15:28:05 +0800639 virtblk_name_format("vd", index, vblk->disk->disk_name, DISK_NAME_LEN);
Christian Borntraegerd50ed902008-02-01 09:05:00 +0100640
Rusty Russelle467cde2007-10-22 11:03:38 +1000641 vblk->disk->major = major;
Christian Borntraegerd50ed902008-02-01 09:05:00 +0100642 vblk->disk->first_minor = index_to_minor(index);
Rusty Russelle467cde2007-10-22 11:03:38 +1000643 vblk->disk->private_data = vblk;
644 vblk->disk->fops = &virtblk_fops;
Fam Zheng5fa31422015-09-06 17:05:42 +0800645 vblk->disk->flags |= GENHD_FL_EXT_DEVT;
Michael S. Tsirkin5087a502011-10-30 21:29:59 +0200646 vblk->index = index;
Christian Borntraeger4f3bf192008-01-31 15:53:53 +0100647
Tejun Heo02c42b72010-09-03 11:56:18 +0200648 /* configure queue flush support */
Paolo Bonzinicd5d5032012-07-03 15:19:37 +0200649 virtblk_update_cache_mode(vdev);
Rusty Russelle467cde2007-10-22 11:03:38 +1000650
Christian Borntraeger3ef53602008-05-16 11:17:03 +0200651 /* If disk is read-only in the host, the guest should obey */
652 if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO))
653 set_disk_ro(vblk->disk, 1);
654
Rusty Russella586d4f2008-02-04 23:49:56 -0500655 /* Host must always specify the capacity. */
Rusty Russell855e0c52013-10-14 18:11:51 +1030656 virtio_cread(vdev, struct virtio_blk_config, capacity, &cap);
Rusty Russelle467cde2007-10-22 11:03:38 +1000657
658 /* If capacity is too big, truncate with warning. */
659 if ((sector_t)cap != cap) {
660 dev_warn(&vdev->dev, "Capacity %llu too large: truncating\n",
661 (unsigned long long)cap);
662 cap = (sector_t)-1;
663 }
664 set_capacity(vblk->disk, cap);
665
Rusty Russell0864b792008-12-30 09:26:05 -0600666 /* We can handle whatever the host told us to handle. */
Martin K. Petersenee714f22010-03-10 00:48:32 -0500667 blk_queue_max_segments(q, vblk->sg_elems-2);
Rusty Russell0864b792008-12-30 09:26:05 -0600668
Christoph Hellwig4eff3ca2009-07-17 21:47:45 -0600669 /* No need to bounce any requests */
Christoph Hellwig69740c82010-02-24 14:22:25 -0600670 blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
Christoph Hellwig4eff3ca2009-07-17 21:47:45 -0600671
Rusty Russell4b7f7e22008-12-30 09:26:04 -0600672 /* No real sector limit. */
Martin K. Petersenee714f22010-03-10 00:48:32 -0500673 blk_queue_max_hw_sectors(q, -1U);
Rusty Russell4b7f7e22008-12-30 09:26:04 -0600674
Rusty Russella586d4f2008-02-04 23:49:56 -0500675 /* Host can optionally specify maximum segment size and number of
676 * segments. */
Rusty Russell855e0c52013-10-14 18:11:51 +1030677 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SIZE_MAX,
678 struct virtio_blk_config, size_max, &v);
Rusty Russelle467cde2007-10-22 11:03:38 +1000679 if (!err)
Christoph Hellwig69740c82010-02-24 14:22:25 -0600680 blk_queue_max_segment_size(q, v);
Rusty Russell4b7f7e22008-12-30 09:26:04 -0600681 else
Christoph Hellwig69740c82010-02-24 14:22:25 -0600682 blk_queue_max_segment_size(q, -1U);
Rusty Russelle467cde2007-10-22 11:03:38 +1000683
Christian Borntraeger066f4d82008-05-29 11:08:26 +0200684 /* Host can optionally specify the block size of the device */
Rusty Russell855e0c52013-10-14 18:11:51 +1030685 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_BLK_SIZE,
686 struct virtio_blk_config, blk_size,
687 &blk_size);
Christian Borntraeger066f4d82008-05-29 11:08:26 +0200688 if (!err)
Christoph Hellwig69740c82010-02-24 14:22:25 -0600689 blk_queue_logical_block_size(q, blk_size);
690 else
691 blk_size = queue_logical_block_size(q);
692
693 /* Use topology information if available */
Rusty Russell855e0c52013-10-14 18:11:51 +1030694 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
695 struct virtio_blk_config, physical_block_exp,
696 &physical_block_exp);
Christoph Hellwig69740c82010-02-24 14:22:25 -0600697 if (!err && physical_block_exp)
698 blk_queue_physical_block_size(q,
699 blk_size * (1 << physical_block_exp));
700
Rusty Russell855e0c52013-10-14 18:11:51 +1030701 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
702 struct virtio_blk_config, alignment_offset,
703 &alignment_offset);
Christoph Hellwig69740c82010-02-24 14:22:25 -0600704 if (!err && alignment_offset)
705 blk_queue_alignment_offset(q, blk_size * alignment_offset);
706
Rusty Russell855e0c52013-10-14 18:11:51 +1030707 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
708 struct virtio_blk_config, min_io_size,
709 &min_io_size);
Christoph Hellwig69740c82010-02-24 14:22:25 -0600710 if (!err && min_io_size)
711 blk_queue_io_min(q, blk_size * min_io_size);
712
Rusty Russell855e0c52013-10-14 18:11:51 +1030713 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
714 struct virtio_blk_config, opt_io_size,
715 &opt_io_size);
Christoph Hellwig69740c82010-02-24 14:22:25 -0600716 if (!err && opt_io_size)
717 blk_queue_io_opt(q, blk_size * opt_io_size);
718
Michael S. Tsirkin7a113702014-10-15 10:22:30 +1030719 virtio_device_ready(vdev);
720
Dan Williams0d52c7562016-06-15 19:44:20 -0700721 device_add_disk(&vdev->dev, vblk->disk);
Ryan Harpera5eb9e42010-06-23 22:19:57 -0500722 err = device_create_file(disk_to_dev(vblk->disk), &dev_attr_serial);
723 if (err)
724 goto out_del_disk;
725
Paolo Bonzinicd5d5032012-07-03 15:19:37 +0200726 if (virtio_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE))
727 err = device_create_file(disk_to_dev(vblk->disk),
728 &dev_attr_cache_type_rw);
729 else
730 err = device_create_file(disk_to_dev(vblk->disk),
731 &dev_attr_cache_type_ro);
732 if (err)
733 goto out_del_disk;
Rusty Russelle467cde2007-10-22 11:03:38 +1000734 return 0;
735
Ryan Harpera5eb9e42010-06-23 22:19:57 -0500736out_del_disk:
737 del_gendisk(vblk->disk);
738 blk_cleanup_queue(vblk->disk->queue);
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600739out_free_tags:
740 blk_mq_free_tag_set(&vblk->tag_set);
Rusty Russelle467cde2007-10-22 11:03:38 +1000741out_put_disk:
742 put_disk(vblk->disk);
Rusty Russelle467cde2007-10-22 11:03:38 +1000743out_free_vq:
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -0600744 vdev->config->del_vqs(vdev);
Rusty Russelle467cde2007-10-22 11:03:38 +1000745out_free_vblk:
746 kfree(vblk);
Michael S. Tsirkin5087a502011-10-30 21:29:59 +0200747out_free_index:
748 ida_simple_remove(&vd_index_ida, index);
Rusty Russelle467cde2007-10-22 11:03:38 +1000749out:
750 return err;
751}
752
Greg Kroah-Hartman8d85fce2012-12-21 15:13:49 -0800753static void virtblk_remove(struct virtio_device *vdev)
Rusty Russelle467cde2007-10-22 11:03:38 +1000754{
755 struct virtio_blk *vblk = vdev->priv;
Michael S. Tsirkin5087a502011-10-30 21:29:59 +0200756 int index = vblk->index;
Alexander Graff4953fe2013-01-02 15:37:17 +1030757 int refc;
Rusty Russelle467cde2007-10-22 11:03:38 +1000758
Michael S. Tsirkincc74f712014-10-15 10:22:26 +1030759 /* Make sure no work handler is accessing the device. */
760 flush_work(&vblk->config_work);
Christoph Hellwig7a7c9242011-02-01 21:43:48 +0100761
Asias He02e2b122012-05-25 10:34:47 +0800762 del_gendisk(vblk->disk);
Asias He483001c2012-05-25 10:34:48 +0800763 blk_cleanup_queue(vblk->disk->queue);
Asias He02e2b122012-05-25 10:34:47 +0800764
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600765 blk_mq_free_tag_set(&vblk->tag_set);
766
Rusty Russell6e5aa7e2008-02-04 23:50:03 -0500767 /* Stop all the virtqueues. */
768 vdev->config->reset(vdev);
769
Alexander Graff4953fe2013-01-02 15:37:17 +1030770 refc = atomic_read(&disk_to_dev(vblk->disk)->kobj.kref.refcount);
Rusty Russelle467cde2007-10-22 11:03:38 +1000771 put_disk(vblk->disk);
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -0600772 vdev->config->del_vqs(vdev);
Ming Lei6a27b652014-06-26 17:41:48 +0800773 kfree(vblk->vqs);
Rusty Russelle467cde2007-10-22 11:03:38 +1000774 kfree(vblk);
Alexander Graff4953fe2013-01-02 15:37:17 +1030775
776 /* Only free device id if we don't have any users */
777 if (refc == 1)
778 ida_simple_remove(&vd_index_ida, index);
Rusty Russelle467cde2007-10-22 11:03:38 +1000779}
780
Aaron Lu89107002013-09-17 09:25:23 +0930781#ifdef CONFIG_PM_SLEEP
Amit Shahf8fb5bc2011-12-22 16:58:30 +0530782static int virtblk_freeze(struct virtio_device *vdev)
783{
784 struct virtio_blk *vblk = vdev->priv;
785
786 /* Ensure we don't receive any more interrupts */
787 vdev->config->reset(vdev);
788
Michael S. Tsirkincc74f712014-10-15 10:22:26 +1030789 /* Make sure no work handler is accessing the device. */
Amit Shahf8fb5bc2011-12-22 16:58:30 +0530790 flush_work(&vblk->config_work);
791
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600792 blk_mq_stop_hw_queues(vblk->disk->queue);
Amit Shahf8fb5bc2011-12-22 16:58:30 +0530793
794 vdev->config->del_vqs(vdev);
795 return 0;
796}
797
798static int virtblk_restore(struct virtio_device *vdev)
799{
800 struct virtio_blk *vblk = vdev->priv;
801 int ret;
802
Amit Shahf8fb5bc2011-12-22 16:58:30 +0530803 ret = init_vq(vdev->priv);
Michael S. Tsirkin6d62c372014-10-15 10:22:32 +1030804 if (ret)
805 return ret;
Jens Axboe1cf7e9c2013-11-01 10:52:52 -0600806
Michael S. Tsirkin6d62c372014-10-15 10:22:32 +1030807 virtio_device_ready(vdev);
808
809 blk_mq_start_stopped_hw_queues(vblk->disk->queue, true);
810 return 0;
Amit Shahf8fb5bc2011-12-22 16:58:30 +0530811}
812#endif
813
Márton Németh47483e22010-01-10 13:40:02 +0100814static const struct virtio_device_id id_table[] = {
Rusty Russelle467cde2007-10-22 11:03:38 +1000815 { VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID },
816 { 0 },
817};
818
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +0200819static unsigned int features_legacy[] = {
Tejun Heo02c42b72010-09-03 11:56:18 +0200820 VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY,
821 VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, VIRTIO_BLK_F_SCSI,
Michael S. Tsirkin592002f2016-02-24 17:07:27 +0200822 VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE,
Ming Lei6a27b652014-06-26 17:41:48 +0800823 VIRTIO_BLK_F_MQ,
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +0200824}
825;
826static unsigned int features[] = {
827 VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY,
828 VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE,
Michael S. Tsirkin592002f2016-02-24 17:07:27 +0200829 VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE,
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +0200830 VIRTIO_BLK_F_MQ,
Rusty Russellc45a6812008-05-02 21:50:50 -0500831};
832
Greg Kroah-Hartman8d85fce2012-12-21 15:13:49 -0800833static struct virtio_driver virtio_blk = {
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +0200834 .feature_table = features,
835 .feature_table_size = ARRAY_SIZE(features),
836 .feature_table_legacy = features_legacy,
837 .feature_table_size_legacy = ARRAY_SIZE(features_legacy),
838 .driver.name = KBUILD_MODNAME,
839 .driver.owner = THIS_MODULE,
840 .id_table = id_table,
841 .probe = virtblk_probe,
842 .remove = virtblk_remove,
843 .config_changed = virtblk_config_changed,
Aaron Lu89107002013-09-17 09:25:23 +0930844#ifdef CONFIG_PM_SLEEP
Michael S. Tsirkin19c1c5a2014-10-07 16:39:49 +0200845 .freeze = virtblk_freeze,
846 .restore = virtblk_restore,
Amit Shahf8fb5bc2011-12-22 16:58:30 +0530847#endif
Rusty Russelle467cde2007-10-22 11:03:38 +1000848};
849
850static int __init init(void)
851{
Christoph Hellwig7a7c9242011-02-01 21:43:48 +0100852 int error;
853
854 virtblk_wq = alloc_workqueue("virtio-blk", 0, 0);
855 if (!virtblk_wq)
856 return -ENOMEM;
857
Christian Borntraeger4f3bf192008-01-31 15:53:53 +0100858 major = register_blkdev(0, "virtblk");
Christoph Hellwig7a7c9242011-02-01 21:43:48 +0100859 if (major < 0) {
860 error = major;
861 goto out_destroy_workqueue;
862 }
863
864 error = register_virtio_driver(&virtio_blk);
865 if (error)
866 goto out_unregister_blkdev;
867 return 0;
868
869out_unregister_blkdev:
870 unregister_blkdev(major, "virtblk");
871out_destroy_workqueue:
872 destroy_workqueue(virtblk_wq);
873 return error;
Rusty Russelle467cde2007-10-22 11:03:38 +1000874}
875
876static void __exit fini(void)
877{
Rusty Russelle467cde2007-10-22 11:03:38 +1000878 unregister_virtio_driver(&virtio_blk);
Michael S. Tsirkin38f37b52014-10-23 18:57:19 +0300879 unregister_blkdev(major, "virtblk");
Christoph Hellwig7a7c9242011-02-01 21:43:48 +0100880 destroy_workqueue(virtblk_wq);
Rusty Russelle467cde2007-10-22 11:03:38 +1000881}
882module_init(init);
883module_exit(fini);
884
885MODULE_DEVICE_TABLE(virtio, id_table);
886MODULE_DESCRIPTION("Virtio block driver");
887MODULE_LICENSE("GPL");