[SCSI] qla4xxx: added support for abort task management command

* Handles SCSI command aborts.
* Serialization srb between error handler and command
  completion path.

Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Signed-off-by: Ravi Anand <ravi.anand@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 53 insertions, 0 deletions

diff --git a/drivers/scsi/qla4xxx/ql4_mbx.c b/drivers/scsi/qla4xxx/ql4_mbx.c
index 43581ce3a1b6..e1315cd8c261 100644
--- a/drivers/scsi/qla4xxx/ql4_mbx.c
+++ b/drivers/scsi/qla4xxx/ql4_mbx.c
@@ -762,6 +762,59 @@ exit_get_event_log:
 }
 
 /**
+ * qla4xxx_abort_task - issues Abort Task
+ * @ha: Pointer to host adapter structure.
+ * @srb: Pointer to srb entry
+ *
+ * This routine performs a LUN RESET on the specified target/lun.
+ * The caller must ensure that the ddb_entry and lun_entry pointers
+ * are valid before calling this routine.
+ **/
+int qla4xxx_abort_task(struct scsi_qla_host *ha, struct srb *srb)
+{
+        uint32_t mbox_cmd[MBOX_REG_COUNT];
+        uint32_t mbox_sts[MBOX_REG_COUNT];
+        struct scsi_cmnd *cmd = srb->cmd;
+        int status = QLA_SUCCESS;
+        unsigned long flags = 0;
+        uint32_t index;
+
+        /*
+         * Send abort task command to ISP, so that the ISP will return
+         * request with ABORT status
+         */
+        memset(&mbox_cmd, 0, sizeof(mbox_cmd));
+        memset(&mbox_sts, 0, sizeof(mbox_sts));
+
+        spin_lock_irqsave(&ha->hardware_lock, flags);
+        index = (unsigned long)(unsigned char *)cmd->host_scribble;
+        spin_unlock_irqrestore(&ha->hardware_lock, flags);
+
+        /* Firmware already posted completion on response queue */
+        if (index == MAX_SRBS)
+                return status;
+
+        mbox_cmd[0] = MBOX_CMD_ABORT_TASK;
+        mbox_cmd[1] = srb->fw_ddb_index;
+        mbox_cmd[2] = index;
+        /* Immediate Command Enable */
+        mbox_cmd[5] = 0x01;
+
+        qla4xxx_mailbox_command(ha, MBOX_REG_COUNT, 5, &mbox_cmd[0],
+            &mbox_sts[0]);
+        if (mbox_sts[0] != MBOX_STS_COMMAND_COMPLETE) {
+                status = QLA_ERROR;
+
+                DEBUG2(printk(KERN_WARNING "scsi%ld:%d:%d: abort task FAILED: "
+                    "mbx0=%04X, mb1=%04X, mb2=%04X, mb3=%04X, mb4=%04X\n",
+                    ha->host_no, cmd->device->id, cmd->device->lun, mbox_sts[0],
+                    mbox_sts[1], mbox_sts[2], mbox_sts[3], mbox_sts[4]));
+        }
+
+        return status;
+}
+
+/**
  * qla4xxx_reset_lun - issues LUN Reset
  * @ha: Pointer to host adapter structure.
  * @db_entry: Pointer to device database entry