[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>

diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c
index 7a81267..e2cf12e 100644 (file)
--- a/drivers/scsi/megaraid/megaraid_sas.c
+++ b/drivers/scsi/megaraid/megaraid_sas.c
@@ -10,7 +10,7 @@
  *        2 of the License, or (at your option) any later version.
  *
  * FILE                : megaraid_sas.c
- * Version     : v00.00.03.10-rc1
+ * Version     : v00.00.03.10-rc5
  *
  * Authors:
  *     (email-id : megaraidlinux@lsi.com)
@@ -886,6 +886,7 @@ megasas_queue_command(struct scsi_cmnd *scmd, void (*done) (struct scsi_cmnd *))
                goto out_return_cmd;
 
        cmd->scmd = scmd;
+       scmd->SCp.ptr = (char *)cmd;
 
        /*
         * Issue the command to the FW
@@ -919,7 +920,7 @@ static int megasas_slave_configure(struct scsi_device *sdev)
         * The RAID firmware may require extended timeouts.
         */
        if (sdev->channel >= MEGASAS_MAX_PD_CHANNELS)
-               sdev->timeout = 90 * HZ;
+               sdev->timeout = MEGASAS_DEFAULT_CMD_TIMEOUT * HZ;
        return 0;
 }
 
@@ -981,8 +982,8 @@ static int megasas_generic_reset(struct scsi_cmnd *scmd)
 
        instance = (struct megasas_instance *)scmd->device->host->hostdata;
 
-       scmd_printk(KERN_NOTICE, scmd, "megasas: RESET -%ld cmd=%x\n",
-              scmd->serial_number, scmd->cmnd[0]);
+       scmd_printk(KERN_NOTICE, scmd, "megasas: RESET -%ld cmd=%x retries=%x\n",
+                scmd->serial_number, scmd->cmnd[0], scmd->retries);
 
        if (instance->hw_crit_error) {
                printk(KERN_ERR "megasas: cannot recover from previous reset "
@@ -1000,6 +1001,39 @@ static int megasas_generic_reset(struct scsi_cmnd *scmd)
 }
 
 /**
+ * megasas_reset_timer - quiesce the adapter if required
+ * @scmd:              scsi cmnd
+ *
+ * Sets the FW busy flag and reduces the host->can_queue if the
+ * cmd has not been completed within the timeout period.
+ */
+static enum
+scsi_eh_timer_return megasas_reset_timer(struct scsi_cmnd *scmd)
+{
+       struct megasas_cmd *cmd = (struct megasas_cmd *)scmd->SCp.ptr;
+       struct megasas_instance *instance;
+       unsigned long flags;
+
+       if (time_after(jiffies, scmd->jiffies_at_alloc +
+                               (MEGASAS_DEFAULT_CMD_TIMEOUT * 2) * HZ)) {
+               return EH_NOT_HANDLED;
+       }
+
+       instance = cmd->instance;
+       if (!(instance->flag & MEGASAS_FW_BUSY)) {
+               /* FW is busy, throttle IO */
+               spin_lock_irqsave(instance->host->host_lock, flags);
+
+               instance->host->can_queue = 16;
+               instance->last_time = jiffies;
+               instance->flag |= MEGASAS_FW_BUSY;
+
+               spin_unlock_irqrestore(instance->host->host_lock, flags);
+       }
+       return EH_RESET_TIMER;
+}
+
+/**
  * megasas_reset_device -      Device reset handler entry point
  */
 static int megasas_reset_device(struct scsi_cmnd *scmd)
@@ -1112,6 +1146,7 @@ static struct scsi_host_template megasas_template = {
        .eh_device_reset_handler = megasas_reset_device,
        .eh_bus_reset_handler = megasas_reset_bus_host,
        .eh_host_reset_handler = megasas_reset_bus_host,
+       .eh_timed_out = megasas_reset_timer,
        .bios_param = megasas_bios_param,
        .use_clustering = ENABLE_CLUSTERING,
 };
@@ -1215,9 +1250,8 @@ megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
        int exception = 0;
        struct megasas_header *hdr = &cmd->frame->hdr;
 
-       if (cmd->scmd) {
-               cmd->scmd->SCp.ptr = (char *)0;
-       }
+       if (cmd->scmd)
+               cmd->scmd->SCp.ptr = NULL;
 
        switch (hdr->cmd) {
 
@@ -1806,6 +1840,7 @@ static void megasas_complete_cmd_dpc(unsigned long instance_addr)
        u32 context;
        struct megasas_cmd *cmd;
        struct megasas_instance *instance = (struct megasas_instance *)instance_addr;
+       unsigned long flags;
 
        /* If we have already declared adapter dead, donot complete cmds */
        if (instance->hw_crit_error)
@@ -1828,6 +1863,22 @@ static void megasas_complete_cmd_dpc(unsigned long instance_addr)
        }
 
        *instance->consumer = producer;
+
+       /*
+        * Check if we can restore can_queue
+        */
+       if (instance->flag & MEGASAS_FW_BUSY
+               && time_after(jiffies, instance->last_time + 5 * HZ)
+               && atomic_read(&instance->fw_outstanding) < 17) {
+
+               spin_lock_irqsave(instance->host->host_lock, flags);
+               instance->flag &= ~MEGASAS_FW_BUSY;
+               instance->host->can_queue =
+                               instance->max_fw_cmds - MEGASAS_INT_CMDS;
+
+               spin_unlock_irqrestore(instance->host->host_lock, flags);
+       }
+
 }
 
 /**
@@ -2398,6 +2449,8 @@ megasas_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
        instance->init_id = MEGASAS_DEFAULT_INIT_ID;
 
        megasas_dbg_lvl = 0;
+       instance->flag = 0;
+       instance->last_time = 0;
 
        /*
         * Initialize MFI Firmware

diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index e862992..4dffc91 100644 (file)
--- 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)                                                \