Commit 19c1c5a6 authored by Michael S. Tsirkin's avatar Michael S. Tsirkin
Browse files

virtio_blk: v1.0 support 



Based on patch by Cornelia Huck.

Note: for consistency, and to avoid sparse errors,
      convert all fields, even those no longer in use
      for virtio v1.0.

Signed-off-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent fdd819b2

drivers/block/virtio_blk.c

+41 −29
Original line number Diff line number Diff line
@@ -80,7 +80,7 @@ static int __virtblk_add_req(struct virtqueue *vq, 
{

	struct scatterlist hdr, status, cmd, sense, inhdr, *sgs[6];

	unsigned int num_out = 0, num_in = 0;

	int type = vbr->out_hdr.type & ~VIRTIO_BLK_T_OUT;

	__virtio32 type = vbr->out_hdr.type & ~cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_OUT);



	sg_init_one(&hdr, &vbr->out_hdr, sizeof(vbr->out_hdr));

	sgs[num_out++] = &hdr;
@@ -91,19 +91,19 @@ static int __virtblk_add_req(struct virtqueue *vq, 
	 * block, and before the normal inhdr we put the sense data and the

	 * inhdr with additional status information.

	 */

	if (type == VIRTIO_BLK_T_SCSI_CMD) {

	if (type == cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_SCSI_CMD)) {

		sg_init_one(&cmd, vbr->req->cmd, vbr->req->cmd_len);

		sgs[num_out++] = &cmd;

	}



	if (have_data) {

		if (vbr->out_hdr.type & VIRTIO_BLK_T_OUT)

		if (vbr->out_hdr.type & cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_OUT))

			sgs[num_out++] = data_sg;

		else

			sgs[num_out + num_in++] = data_sg;

	}



	if (type == VIRTIO_BLK_T_SCSI_CMD) {

	if (type == cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_SCSI_CMD)) {

		sg_init_one(&sense, vbr->req->sense, SCSI_SENSE_BUFFERSIZE);

		sgs[num_out + num_in++] = &sense;

		sg_init_one(&inhdr, &vbr->in_hdr, sizeof(vbr->in_hdr));
@@ -119,12 +119,13 @@ static int __virtblk_add_req(struct virtqueue *vq, 
static inline void virtblk_request_done(struct request *req)

{

	struct virtblk_req *vbr = blk_mq_rq_to_pdu(req);

	struct virtio_blk *vblk = req->q->queuedata;

	int error = virtblk_result(vbr);



	if (req->cmd_type == REQ_TYPE_BLOCK_PC) {

		req->resid_len = vbr->in_hdr.residual;

		req->sense_len = vbr->in_hdr.sense_len;

		req->errors = vbr->in_hdr.errors;

		req->resid_len = virtio32_to_cpu(vblk->vdev, vbr->in_hdr.residual);

		req->sense_len = virtio32_to_cpu(vblk->vdev, vbr->in_hdr.sense_len);

		req->errors = virtio32_to_cpu(vblk->vdev, vbr->in_hdr.errors);

	} else if (req->cmd_type == REQ_TYPE_SPECIAL) {

		req->errors = (error != 0);

	}
@@ -173,25 +174,25 @@ static int virtio_queue_rq(struct blk_mq_hw_ctx *hctx, struct request *req, 


	vbr->req = req;

	if (req->cmd_flags & REQ_FLUSH) {

		vbr->out_hdr.type = VIRTIO_BLK_T_FLUSH;

		vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_FLUSH);

		vbr->out_hdr.sector = 0;

		vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);

		vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req));

	} else {

		switch (req->cmd_type) {

		case REQ_TYPE_FS:

			vbr->out_hdr.type = 0;

			vbr->out_hdr.sector = blk_rq_pos(vbr->req);

			vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);

			vbr->out_hdr.sector = cpu_to_virtio64(vblk->vdev, blk_rq_pos(vbr->req));

			vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req));

			break;

		case REQ_TYPE_BLOCK_PC:

			vbr->out_hdr.type = VIRTIO_BLK_T_SCSI_CMD;

			vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_SCSI_CMD);

			vbr->out_hdr.sector = 0;

			vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);

			vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req));

			break;

		case REQ_TYPE_SPECIAL:

			vbr->out_hdr.type = VIRTIO_BLK_T_GET_ID;

			vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_GET_ID);

			vbr->out_hdr.sector = 0;

			vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);

			vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req));

			break;

		default:

			/* We don't put anything else in the queue. */
@@ -204,9 +205,9 @@ static int virtio_queue_rq(struct blk_mq_hw_ctx *hctx, struct request *req, 
	num = blk_rq_map_sg(hctx->queue, vbr->req, vbr->sg);

	if (num) {

		if (rq_data_dir(vbr->req) == WRITE)

			vbr->out_hdr.type |= VIRTIO_BLK_T_OUT;

			vbr->out_hdr.type |= cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_OUT);

		else

			vbr->out_hdr.type |= VIRTIO_BLK_T_IN;

			vbr->out_hdr.type |= cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_IN);

	}



	spin_lock_irqsave(&vblk->vqs[qid].lock, flags);
@@ -476,7 +477,8 @@ static int virtblk_get_cache_mode(struct virtio_device *vdev) 
				   struct virtio_blk_config, wce,

				   &writeback);

	if (err)

		writeback = virtio_has_feature(vdev, VIRTIO_BLK_F_WCE);

		writeback = virtio_has_feature(vdev, VIRTIO_BLK_F_WCE) ||

		            virtio_has_feature(vdev, VIRTIO_F_VERSION_1);



	return writeback;

}
@@ -821,16 +823,26 @@ static const struct virtio_device_id id_table[] = { 
	{ 0 },

};



static unsigned int features[] = {

static unsigned int features_legacy[] = {

	VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY,

	VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, VIRTIO_BLK_F_SCSI,

	VIRTIO_BLK_F_WCE, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE,

	VIRTIO_BLK_F_MQ,

}

;

static unsigned int features[] = {

	VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY,

	VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE,

	VIRTIO_BLK_F_TOPOLOGY,

	VIRTIO_BLK_F_MQ,

	VIRTIO_F_VERSION_1,

};



static struct virtio_driver virtio_blk = {

	.feature_table			= features,

	.feature_table_size		= ARRAY_SIZE(features),

	.feature_table_legacy		= features_legacy,

	.feature_table_size_legacy	= ARRAY_SIZE(features_legacy),

	.driver.name			= KBUILD_MODNAME,

	.driver.owner			= THIS_MODULE,

	.id_table			= id_table,

include/uapi/linux/virtio_blk.h

+8 −7
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ 
#include <linux/types.h>

#include <linux/virtio_ids.h>

#include <linux/virtio_config.h>

#include <linux/virtio_types.h>



/* Feature bits */

#define VIRTIO_BLK_F_BARRIER	0	/* Does host support barriers? */
@@ -114,18 +115,18 @@ struct virtio_blk_config { 
/* This is the first element of the read scatter-gather list. */

struct virtio_blk_outhdr {

	/* VIRTIO_BLK_T* */

	__u32 type;

	__virtio32 type;

	/* io priority. */

	__u32 ioprio;

	__virtio32 ioprio;

	/* Sector (ie. 512 byte offset) */

	__u64 sector;

	__virtio64 sector;

};



struct virtio_scsi_inhdr {

	__u32 errors;

	__u32 data_len;

	__u32 sense_len;

	__u32 residual;

	__virtio32 errors;

	__virtio32 data_len;

	__virtio32 sense_len;

	__virtio32 residual;

};



/* And this is the final byte of the write scatter-gather list. */

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