diff options
Diffstat (limited to 'drivers/scsi/virtio_scsi.c')
| -rw-r--r-- | drivers/scsi/virtio_scsi.c | 86 |
1 files changed, 69 insertions, 17 deletions
diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c index 99fdb940394..89ee5929eb6 100644 --- a/drivers/scsi/virtio_scsi.c +++ b/drivers/scsi/virtio_scsi.c @@ -23,6 +23,7 @@ #include <linux/virtio_config.h> #include <linux/virtio_scsi.h> #include <linux/cpu.h> +#include <linux/blkdev.h> #include <scsi/scsi_host.h> #include <scsi/scsi_device.h> #include <scsi/scsi_cmnd.h> @@ -37,6 +38,7 @@ struct virtio_scsi_cmd { struct completion *comp; union { struct virtio_scsi_cmd_req cmd; + struct virtio_scsi_cmd_req_pi cmd_pi; struct virtio_scsi_ctrl_tmf_req tmf; struct virtio_scsi_ctrl_an_req an; } req; @@ -399,7 +401,7 @@ static int virtscsi_add_cmd(struct virtqueue *vq, 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; @@ -417,16 +419,24 @@ static int virtscsi_add_cmd(struct virtqueue *vq, sgs[out_num++] = &req; /* Data-out buffer. */ - if (out) + if (out) { + /* Place WRITE protection SGLs before Data OUT payload */ + if (scsi_prot_sg_count(sc)) + sgs[out_num++] = scsi_prot_sglist(sc); sgs[out_num++] = out->sgl; + } /* Response header. */ sg_init_one(&resp, &cmd->resp, resp_size); 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_ATOMIC); } @@ -451,12 +461,45 @@ static int virtscsi_kick_cmd(struct virtio_scsi_vq *vq, return err; } +static void virtio_scsi_init_hdr(struct virtio_scsi_cmd_req *cmd, + struct scsi_cmnd *sc) +{ + cmd->lun[0] = 1; + cmd->lun[1] = sc->device->id; + cmd->lun[2] = (sc->device->lun >> 8) | 0x40; + cmd->lun[3] = sc->device->lun & 0xff; + cmd->tag = (unsigned long)sc; + cmd->task_attr = VIRTIO_SCSI_S_SIMPLE; + cmd->prio = 0; + cmd->crn = 0; +} + +static void virtio_scsi_init_hdr_pi(struct virtio_scsi_cmd_req_pi *cmd_pi, + struct scsi_cmnd *sc) +{ + struct request *rq = sc->request; + struct blk_integrity *bi; + + virtio_scsi_init_hdr((struct virtio_scsi_cmd_req *)cmd_pi, sc); + + if (!rq || !scsi_prot_sg_count(sc)) + return; + + bi = blk_get_integrity(rq->rq_disk); + + if (sc->sc_data_direction == DMA_TO_DEVICE) + cmd_pi->pi_bytesout = blk_rq_sectors(rq) * bi->tuple_size; + else if (sc->sc_data_direction == DMA_FROM_DEVICE) + cmd_pi->pi_bytesin = blk_rq_sectors(rq) * bi->tuple_size; +} + static int virtscsi_queuecommand(struct virtio_scsi *vscsi, struct virtio_scsi_vq *req_vq, struct scsi_cmnd *sc) { 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); @@ -468,22 +511,20 @@ static int virtscsi_queuecommand(struct virtio_scsi *vscsi, 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)) != 0) return SCSI_MLQUEUE_HOST_BUSY; return 0; } @@ -820,7 +861,7 @@ static int virtscsi_probe(struct virtio_device *vdev) { struct Scsi_Host *shost; struct virtio_scsi *vscsi; - int err; + int err, host_prot; u32 sg_elems, num_targets; u32 cmd_per_lun; u32 num_queues; @@ -870,6 +911,16 @@ static int virtscsi_probe(struct virtio_device *vdev) shost->max_id = num_targets; shost->max_channel = 0; shost->max_cmd_len = VIRTIO_SCSI_CDB_SIZE; + + if (virtio_has_feature(vdev, VIRTIO_SCSI_F_T10_PI)) { + host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION | + SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION | + SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION; + + scsi_host_set_prot(shost, host_prot); + scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC); + } + err = scsi_add_host(shost, &vdev->dev); if (err) goto scsi_add_host_failed; @@ -939,6 +990,7 @@ static struct virtio_device_id id_table[] = { static unsigned int features[] = { VIRTIO_SCSI_F_HOTPLUG, VIRTIO_SCSI_F_CHANGE, + VIRTIO_SCSI_F_T10_PI, }; static struct virtio_driver virtio_scsi_driver = { |