[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, 60 insertions, 7 deletions

diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c
index 7a812677ff8..e2cf12ef368 100644
--- 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