scsi-disk: move all non-DMA commands to scsi_disk_emulate_command
We want to use separate SCSIReqOps for emulated commands needing an
allocated buffer vs. those that are zerocopy when the HBA supports
S/G lists. Ensure that all of the former are in scsi_disk_emulate_command.
Commands that do not have any parameters are more similar to emulated
commands, so also move them, even if they do I/O.
Finally, MODE SELECT and MODE SELECT(10) are broken because we do not
yet support passing parameter data _to_ emulated commands, so disable
them.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
index f8e9dc1..9f7258d 100644
--- a/hw/scsi-disk.c
+++ b/hw/scsi-disk.c
@@ -1448,10 +1448,65 @@
}
DPRINTF("Unsupported Service Action In\n");
goto illegal_request;
+ case SYNCHRONIZE_CACHE:
+ /* The request is used as the AIO opaque value, so add a ref. */
+ scsi_req_ref(&r->req);
+ bdrv_acct_start(s->qdev.conf.bs, &r->acct, 0, BDRV_ACCT_FLUSH);
+ r->req.aiocb = bdrv_aio_flush(s->qdev.conf.bs, scsi_aio_complete, r);
+ return 0;
+ case SEEK_10:
+ DPRINTF("Seek(10) (sector %" PRId64 ")\n", r->req.cmd.lba);
+ if (r->req.cmd.lba > s->qdev.max_lba) {
+ goto illegal_lba;
+ }
+ break;
+#if 0
+ case MODE_SELECT:
+ DPRINTF("Mode Select(6) (len %lu)\n", (long)r->req.cmd.xfer);
+ /* We don't support mode parameter changes.
+ Allow the mode parameter header + block descriptors only. */
+ if (r->req.cmd.xfer > 12) {
+ goto illegal_request;
+ }
+ break;
+ case MODE_SELECT_10:
+ DPRINTF("Mode Select(10) (len %lu)\n", (long)r->req.cmd.xfer);
+ /* We don't support mode parameter changes.
+ Allow the mode parameter header + block descriptors only. */
+ if (r->req.cmd.xfer > 16) {
+ goto illegal_request;
+ }
+ break;
+#endif
+ case WRITE_SAME_10:
+ nb_sectors = lduw_be_p(&req->cmd.buf[7]);
+ goto write_same;
+ case WRITE_SAME_16:
+ nb_sectors = ldl_be_p(&req->cmd.buf[10]) & 0xffffffffULL;
+ write_same:
+ if (r->req.cmd.lba > s->qdev.max_lba) {
+ goto illegal_lba;
+ }
+
+ /*
+ * We only support WRITE SAME with the unmap bit set for now.
+ */
+ if (!(req->cmd.buf[1] & 0x8)) {
+ goto illegal_request;
+ }
+
+ /* The request is used as the AIO opaque value, so add a ref. */
+ scsi_req_ref(&r->req);
+ r->req.aiocb = bdrv_aio_discard(s->qdev.conf.bs,
+ r->req.cmd.lba * (s->qdev.blocksize / 512),
+ nb_sectors * (s->qdev.blocksize / 512),
+ scsi_aio_complete, r);
+ return 0;
default:
scsi_check_condition(r, SENSE_CODE(INVALID_OPCODE));
return -1;
}
+ assert(r->sector_count == 0);
buflen = MIN(buflen, req->cmd.xfer);
return buflen;
@@ -1460,6 +1515,10 @@
scsi_check_condition(r, SENSE_CODE(INVALID_FIELD));
}
return -1;
+
+illegal_lba:
+ scsi_check_condition(r, SENSE_CODE(LBA_OUT_OF_RANGE));
+ return 0;
}
/* Execute a scsi command. Returns the length of the data expected by the
@@ -1513,38 +1572,6 @@
}
switch (command) {
- case TEST_UNIT_READY:
- case INQUIRY:
- case MODE_SENSE:
- case MODE_SENSE_10:
- case RESERVE:
- case RESERVE_10:
- case RELEASE:
- case RELEASE_10:
- case START_STOP:
- case ALLOW_MEDIUM_REMOVAL:
- case READ_CAPACITY_10:
- case READ_TOC:
- case READ_DISC_INFORMATION:
- case READ_DVD_STRUCTURE:
- case GET_CONFIGURATION:
- case GET_EVENT_STATUS_NOTIFICATION:
- case MECHANISM_STATUS:
- case SERVICE_ACTION_IN_16:
- case REQUEST_SENSE:
- rc = scsi_disk_emulate_command(r);
- if (rc < 0) {
- return 0;
- }
-
- r->iov.iov_len = rc;
- break;
- case SYNCHRONIZE_CACHE:
- /* The request is used as the AIO opaque value, so add a ref. */
- scsi_req_ref(&r->req);
- bdrv_acct_start(s->qdev.conf.bs, &r->acct, 0, BDRV_ACCT_FLUSH);
- r->req.aiocb = bdrv_aio_flush(s->qdev.conf.bs, scsi_aio_complete, r);
- return 0;
case READ_6:
case READ_10:
case READ_12:
@@ -1577,63 +1604,16 @@
r->sector = r->req.cmd.lba * (s->qdev.blocksize / 512);
r->sector_count = len * (s->qdev.blocksize / 512);
break;
- case MODE_SELECT:
- DPRINTF("Mode Select(6) (len %lu)\n", (long)r->req.cmd.xfer);
- /* We don't support mode parameter changes.
- Allow the mode parameter header + block descriptors only. */
- if (r->req.cmd.xfer > 12) {
- goto fail;
- }
- break;
- case MODE_SELECT_10:
- DPRINTF("Mode Select(10) (len %lu)\n", (long)r->req.cmd.xfer);
- /* We don't support mode parameter changes.
- Allow the mode parameter header + block descriptors only. */
- if (r->req.cmd.xfer > 16) {
- goto fail;
- }
- break;
- case SEEK_10:
- DPRINTF("Seek(10) (sector %" PRId64 ")\n", r->req.cmd.lba);
- if (r->req.cmd.lba > s->qdev.max_lba) {
- goto illegal_lba;
- }
- break;
- case WRITE_SAME_10:
- len = lduw_be_p(&buf[7]);
- goto write_same;
- case WRITE_SAME_16:
- len = ldl_be_p(&buf[10]) & 0xffffffffULL;
- write_same:
-
- DPRINTF("WRITE SAME() (sector %" PRId64 ", count %d)\n",
- r->req.cmd.lba, len);
-
- if (r->req.cmd.lba > s->qdev.max_lba) {
- goto illegal_lba;
- }
-
- /*
- * We only support WRITE SAME with the unmap bit set for now.
- */
- if (!(buf[1] & 0x8)) {
- goto fail;
- }
-
- /* The request is used as the AIO opaque value, so add a ref. */
- scsi_req_ref(&r->req);
- r->req.aiocb = bdrv_aio_discard(s->qdev.conf.bs,
- r->req.cmd.lba * (s->qdev.blocksize / 512),
- len * (s->qdev.blocksize / 512),
- scsi_aio_complete, r);
- return 0;
default:
- DPRINTF("Unknown SCSI command (%2.2x)\n", buf[0]);
- scsi_check_condition(r, SENSE_CODE(INVALID_OPCODE));
- return 0;
- fail:
- scsi_check_condition(r, SENSE_CODE(INVALID_FIELD));
- return 0;
+ rc = scsi_disk_emulate_command(r);
+ if (rc < 0) {
+ return 0;
+ }
+ if (r->req.aiocb) {
+ return 0;
+ }
+ r->iov.iov_len = rc;
+ break;
illegal_lba:
scsi_check_condition(r, SENSE_CODE(LBA_OUT_OF_RANGE));
return 0;
