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authorChristoph Hellwig <hch@lst.de>2010-12-16 19:36:43 +0100
committerKevin Wolf <kwolf@redhat.com>2010-12-17 16:11:03 +0100
commitea3bd56f56822350bbb91518b3d786948f573359 (patch)
treece5da39decfbf43ca98d7a836043bfc86ab147c8
parentbb8bf76fb1c4afa116a7f11fee559b3cca671a4a (diff)
scsi-disk: support WRITE SAME (16) with unmap bit
Support discards via the WRITE SAME command with the unmap bit set, and tell the initiator about the support for it via the block limit and the new thin provisioning EVPD pages. Also fix the comment which incorrectly describedthe block limits EVPD page. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
-rw-r--r--hw/scsi-defs.h1
-rw-r--r--hw/scsi-disk.c53
2 files changed, 52 insertions, 2 deletions
diff --git a/hw/scsi-defs.h b/hw/scsi-defs.h
index 1473ecbddc..413cce07b5 100644
--- a/hw/scsi-defs.h
+++ b/hw/scsi-defs.h
@@ -84,6 +84,7 @@
#define MODE_SENSE_10 0x5a
#define PERSISTENT_RESERVE_IN 0x5e
#define PERSISTENT_RESERVE_OUT 0x5f
+#define WRITE_SAME_16 0x93
#define MAINTENANCE_IN 0xa3
#define MAINTENANCE_OUT 0xa4
#define MOVE_MEDIUM 0xa5
diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
index 87f9e8677e..6cb317c8f9 100644
--- a/hw/scsi-disk.c
+++ b/hw/scsi-disk.c
@@ -424,7 +424,8 @@ static int scsi_disk_emulate_inquiry(SCSIRequest *req, uint8_t *outbuf)
outbuf[buflen++] = 0x80; // unit serial number
outbuf[buflen++] = 0x83; // device identification
if (bdrv_get_type_hint(s->bs) != BDRV_TYPE_CDROM) {
- outbuf[buflen++] = 0xb0; // block device characteristics
+ outbuf[buflen++] = 0xb0; // block limits
+ outbuf[buflen++] = 0xb2; // thin provisioning
}
outbuf[pages] = buflen - pages - 1; // number of pages
break;
@@ -466,8 +467,10 @@ static int scsi_disk_emulate_inquiry(SCSIRequest *req, uint8_t *outbuf)
buflen += id_len;
break;
}
- case 0xb0: /* block device characteristics */
+ case 0xb0: /* block limits */
{
+ unsigned int unmap_sectors =
+ s->qdev.conf.discard_granularity / s->qdev.blocksize;
unsigned int min_io_size =
s->qdev.conf.min_io_size / s->qdev.blocksize;
unsigned int opt_io_size =
@@ -492,6 +495,21 @@ static int scsi_disk_emulate_inquiry(SCSIRequest *req, uint8_t *outbuf)
outbuf[13] = (opt_io_size >> 16) & 0xff;
outbuf[14] = (opt_io_size >> 8) & 0xff;
outbuf[15] = opt_io_size & 0xff;
+
+ /* optimal unmap granularity */
+ outbuf[28] = (unmap_sectors >> 24) & 0xff;
+ outbuf[29] = (unmap_sectors >> 16) & 0xff;
+ outbuf[30] = (unmap_sectors >> 8) & 0xff;
+ outbuf[31] = unmap_sectors & 0xff;
+ break;
+ }
+ case 0xb2: /* thin provisioning */
+ {
+ outbuf[3] = buflen = 8;
+ outbuf[4] = 0;
+ outbuf[5] = 0x40; /* write same with unmap supported */
+ outbuf[6] = 0;
+ outbuf[7] = 0;
break;
}
default:
@@ -959,6 +977,12 @@ static int scsi_disk_emulate_command(SCSIDiskReq *r, uint8_t *outbuf)
outbuf[11] = 0;
outbuf[12] = 0;
outbuf[13] = get_physical_block_exp(&s->qdev.conf);
+
+ /* set TPE bit if the format supports discard */
+ if (s->qdev.conf.discard_granularity) {
+ outbuf[14] = 0x80;
+ }
+
/* Protection, exponent and lowest lba field left blank. */
buflen = req->cmd.xfer;
break;
@@ -1123,6 +1147,31 @@ static int32_t scsi_send_command(SCSIDevice *d, uint32_t tag,
goto illegal_lba;
}
break;
+ case WRITE_SAME_16:
+ len = r->req.cmd.xfer / d->blocksize;
+
+ DPRINTF("WRITE SAME(16) (sector %" PRId64 ", count %d)\n",
+ r->req.cmd.lba, len);
+
+ if (r->req.cmd.lba > s->max_lba) {
+ goto illegal_lba;
+ }
+
+ /*
+ * We only support WRITE SAME with the unmap bit set for now.
+ */
+ if (!(buf[1] & 0x8)) {
+ goto fail;
+ }
+
+ rc = bdrv_discard(s->bs, r->req.cmd.lba * s->cluster_size,
+ len * s->cluster_size);
+ if (rc < 0) {
+ /* XXX: better error code ?*/
+ goto fail;
+ }
+
+ break;
default:
DPRINTF("Unknown SCSI command (%2.2x)\n", buf[0]);
fail: