[SCSI] qla4xxx: Add target reset functionality

This patch adds target reset functionalty.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Acked-by: David Somayajulu <david.somayajulu@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 39 insertions, 0 deletions

diff --git a/drivers/scsi/qla4xxx/ql4_mbx.c b/drivers/scsi/qla4xxx/ql4_mbx.c
index 35cd73c72a68..c577d79bd7e8 100644
--- a/drivers/scsi/qla4xxx/ql4_mbx.c
+++ b/drivers/scsi/qla4xxx/ql4_mbx.c
@@ -713,6 +713,45 @@ int qla4xxx_reset_lun(struct scsi_qla_host * ha, struct ddb_entry * ddb_entry,
         return status;
 }
 
+/**
+ * qla4xxx_reset_target - issues target Reset
+ * @ha: Pointer to host adapter structure.
+ * @db_entry: Pointer to device database entry
+ * @un_entry: Pointer to lun entry structure
+ *
+ * This routine performs a TARGET RESET on the specified target.
+ * The caller must ensure that the ddb_entry pointers
+ * are valid before calling this routine.
+ **/
+int qla4xxx_reset_target(struct scsi_qla_host *ha,
+                         struct ddb_entry *ddb_entry)
+{
+        uint32_t mbox_cmd[MBOX_REG_COUNT];
+        uint32_t mbox_sts[MBOX_REG_COUNT];
+        int status = QLA_SUCCESS;
+
+        DEBUG2(printk("scsi%ld:%d: target reset issued\n", ha->host_no,
+                      ddb_entry->os_target_id));
+
+        /*
+         * Send target reset command to ISP, so that the ISP will return all
+         * outstanding requests with RESET status
+         */
+        memset(&mbox_cmd, 0, sizeof(mbox_cmd));
+        memset(&mbox_sts, 0, sizeof(mbox_sts));
+
+        mbox_cmd[0] = MBOX_CMD_TARGET_WARM_RESET;
+        mbox_cmd[1] = ddb_entry->fw_ddb_index;
+        mbox_cmd[5] = 0x01;     /* Immediate Command Enable */
+
+        qla4xxx_mailbox_command(ha, MBOX_REG_COUNT, 1, &mbox_cmd[0],
+                                &mbox_sts[0]);
+        if (mbox_sts[0] != MBOX_STS_COMMAND_COMPLETE &&
+            mbox_sts[0] != MBOX_STS_COMMAND_ERROR)
+                status = QLA_ERROR;
+
+        return status;
+}
 
 int qla4xxx_get_flash(struct scsi_qla_host * ha, dma_addr_t dma_addr,
                       uint32_t offset, uint32_t len)