From: Brian Bunker <br...@purestorage.com>
AIX servers using VIOS servers that virtualize FC cards will have a
problem booting without support for START_STOP_UNIT.
Signed-off-by: Brian Bunker <br...@purestorage.com>
Signed-off-by: Spencer Baugh <sba...@catern.com>
---
drivers/target/target_core_sbc.c | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index e318ddb..996e584 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -154,6 +154,35 @@ sbc_emulate_readcapacity_16(struct se_cmd *cmd)
return 0;
}
+static sense_reason_t
+sbc_emulate_startstop(struct se_cmd *cmd)
+{
+ unsigned char *cdb = cmd->t_task_cdb;
+
+ /* From SBC-3:
+ * Immediate bit should be set since there is nothing to complete
+ * POWER CONDITION MODIFIER 0h
+ */
+ if (!(cdb[1] & 1) || (cdb[2] | cdb[3]))
+ return TCM_INVALID_CDB_FIELD;
+
+ /* From SBC-3:
+ * POWER CONDITION 0h START_VALID - process START and LOEJ
+ */
+ if (cdb[4] >> 4 & 0xf)
+ return TCM_INVALID_CDB_FIELD;
+
+ /* From SBC-3:
+ * LOEJ 0h - nothing to load or unload
+ * START 1h - we are ready
+ */
+ if (!(cdb[4] & 1) || ((cdb[4] & 2) | (cdb[4] & 4)))
+ return TCM_INVALID_CDB_FIELD;
+
+ target_complete_cmd(cmd, SAM_STAT_GOOD);
+ return 0;
+}
+
sector_t sbc_get_write_same_sectors(struct se_cmd *cmd)
{
u32 num_blocks;
@@ -1069,6 +1098,10 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
size = 0;
cmd->execute_cmd = sbc_emulate_noop;
break;
+ case START_STOP:
+ size = 0;
+ cmd->execute_cmd = sbc_emulate_startstop;
+ break;
default:
ret = spc_parse_cdb(cmd, &size);
if (ret)
--
2.4.3
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