Subject: linux-next: manual merge of the target-updates tree with the virtio tree

From: Stephen Rothwell <[email-masked]>
Date: Thu, 12 Jun 2014 14:17:32 +1000

Hi Nicholas,

Today's linux-next merge of the target-updates tree got a conflict in
drivers/scsi/virtio_scsi.c between commit c77fba9ab058 ("virtio_scsi:
don't call virtqueue_add_sgs(... GFP_NOIO) holding spinlock") from the
virtio tree and commit e6dc783a38ec ("virtio-scsi: Enable DIF/DIX modes
in SCSI host LLD") from the target-updates tree.

I fixed it up (see below) and can carry the fix as necessary (no action
is required).

-- 
Cheers,
Stephen Rothwell                    [email-masked]

diff --cc drivers/scsi/virtio_scsi.c
index 99fdb9403944,1c326b63ca55..000000000000
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@@ -396,10 -438,11 +398,10 @@@ static void virtscsi_event_done(struct 
   */
  static int virtscsi_add_cmd(struct virtqueue *vq,
  			    struct virtio_scsi_cmd *cmd,
 -			    size_t req_size, size_t resp_size, gfp_t gfp)
 +			    size_t req_size, size_t resp_size)
  {
  	struct scsi_cmnd *sc = cmd->sc;
- 	struct scatterlist *sgs[4], req, resp;
+ 	struct scatterlist *sgs[6], req, resp;
  	struct sg_table *out, *in;
  	unsigned out_num = 0, in_num = 0;
  
@@@ -425,10 -472,14 +431,14 @@@
  	sgs[out_num + in_num++] = &resp;
  
  	/* Data-in buffer */
- 	if (in)
+ 	if (in) {
+ 		/* Place READ protection SGLs before Data IN payload */
+ 		if (scsi_prot_sg_count(sc))
+ 			sgs[out_num + in_num++] = scsi_prot_sglist(sc);
  		sgs[out_num + in_num++] = in->sgl;
+ 	}
  
 -	return virtqueue_add_sgs(vq, sgs, out_num, in_num, cmd, gfp);
 +	return virtqueue_add_sgs(vq, sgs, out_num, in_num, cmd, GFP_ATOMIC);
  }
  
  static int virtscsi_kick_cmd(struct virtio_scsi_vq *vq,
@@@ -455,9 -538,10 +497,10 @@@ static int virtscsi_queuecommand(struc
  				 struct virtio_scsi_vq *req_vq,
  				 struct scsi_cmnd *sc)
  {
 -	struct virtio_scsi_cmd *cmd;
 -	int ret, req_size;
 -
  	struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev);
 +	struct virtio_scsi_cmd *cmd = scsi_cmd_priv(sc);
++	int req_size;
 +
  	BUG_ON(scsi_sg_count(sc) > shost->sg_tablesize);
  
  	/* TODO: check feature bit and fail if unsupported?  */
@@@ -466,26 -550,34 +509,24 @@@
  	dev_dbg(&sc->device->sdev_gendev,
  		"cmd %p CDB: %#02x\n", sc, sc->cmnd[0]);
  
 -	ret = SCSI_MLQUEUE_HOST_BUSY;
 -	cmd = mempool_alloc(virtscsi_cmd_pool, GFP_ATOMIC);
 -	if (!cmd)
 -		goto out;
 -
  	memset(cmd, 0, sizeof(*cmd));
  	cmd->sc = sc;
- 	cmd->req.cmd = (struct virtio_scsi_cmd_req){
- 		.lun[0] = 1,
- 		.lun[1] = sc->device->id,
- 		.lun[2] = (sc->device->lun >> 8) | 0x40,
- 		.lun[3] = sc->device->lun & 0xff,
- 		.tag = (unsigned long)sc,
- 		.task_attr = VIRTIO_SCSI_S_SIMPLE,
- 		.prio = 0,
- 		.crn = 0,
- 	};
  
  	BUG_ON(sc->cmd_len > VIRTIO_SCSI_CDB_SIZE);
- 	memcpy(cmd->req.cmd.cdb, sc->cmnd, sc->cmd_len);
  
- 	if (virtscsi_kick_cmd(req_vq, cmd,
- 			      sizeof cmd->req.cmd, sizeof cmd->resp.cmd) != 0)
+ 	if (virtio_has_feature(vscsi->vdev, VIRTIO_SCSI_F_T10_PI)) {
+ 		virtio_scsi_init_hdr_pi(&cmd->req.cmd_pi, sc);
+ 		memcpy(cmd->req.cmd_pi.cdb, sc->cmnd, sc->cmd_len);
+ 		req_size = sizeof(cmd->req.cmd_pi);
+ 	} else {
+ 		virtio_scsi_init_hdr(&cmd->req.cmd, sc);
+ 		memcpy(cmd->req.cmd.cdb, sc->cmnd, sc->cmd_len);
+ 		req_size = sizeof(cmd->req.cmd);
+ 	}
+ 
 -	if (virtscsi_kick_cmd(req_vq, cmd, req_size, sizeof(cmd->resp.cmd),
 -			      GFP_ATOMIC) == 0)
 -		ret = 0;
 -	else
 -		mempool_free(cmd, virtscsi_cmd_pool);
 -
 -out:
 -	return ret;
++	if (virtscsi_kick_cmd(req_vq, cmd, req_size, sizeof cmd->resp.cmd) != 0)
 +		return SCSI_MLQUEUE_HOST_BUSY;
 +	return 0;
  }
  
  static int virtscsi_queuecommand_single(struct Scsi_Host *sh,