[SCSI] megaraid_sas: intercept cmd timeout and throttle io

eh_timed_out call back (megasas_reset_timer) is used to throttle io
to the adapter when it is called the first time for a scmd.
The MEGASAS_FW_BUSY flag is set and can_queue reduced to 16.
The can_queue is restored from completion routine in following
two conditions : 5 seconds has elapsed and
the # of outstanding cmds in FW is < 17.

Signed-off-by: Sumant Patro <sumant.patro@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 9 insertions, 5 deletions

diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index e862992ee377..4dffc918a414 100644
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -18,9 +18,9 @@
 /*
  * MegaRAID SAS Driver meta data
  */
-#define MEGASAS_VERSION                         "00.00.03.10-rc1"
-#define MEGASAS_RELDATE                         "Feb 14, 2007"
-#define MEGASAS_EXT_VERSION                     "Wed Feb 14 10:14:25 PST 2007"
+#define MEGASAS_VERSION                         "00.00.03.10-rc5"
+#define MEGASAS_RELDATE                         "May 17, 2007"
+#define MEGASAS_EXT_VERSION                     "Thu May 17 10:09:32 PDT 2007"
 
 /*
  * Device IDs
@@ -539,6 +539,8 @@ struct megasas_ctrl_info {
 
 #define MEGASAS_DBG_LVL                         1
 
+#define MEGASAS_FW_BUSY                         1
+
 /*
  * When SCSI mid-layer calls driver's reset routine, driver waits for
  * MEGASAS_RESET_WAIT_TIME seconds for all outstanding IO to complete. Note
@@ -549,8 +551,8 @@ struct megasas_ctrl_info {
 #define MEGASAS_RESET_WAIT_TIME                 180
 #define MEGASAS_INTERNAL_CMD_WAIT_TIME          180
 #define MEGASAS_RESET_NOTICE_INTERVAL           5
-
 #define MEGASAS_IOCTL_CMD                       0
+#define MEGASAS_DEFAULT_CMD_TIMEOUT             90
 
 /*
  * FW reports the maximum of number of commands that it can accept (maximum
@@ -1073,7 +1075,6 @@ struct megasas_instance {
         struct megasas_register_set __iomem *reg_set;
 
         s8 init_id;
-        u8 reserved[3];
 
         u16 max_num_sge;
         u16 max_fw_cmds;
@@ -1104,6 +1105,9 @@ struct megasas_instance {
 
         struct megasas_instance_template *instancet;
         struct tasklet_struct isr_tasklet;
+
+        u8 flag;
+        unsigned long last_time;
 };
 
 #define MEGASAS_IS_LOGICAL(scp)                                         \