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authoradam radford <aradford@gmail.com>2012-07-17 18:20:03 -0700
committerJames Bottomley <JBottomley@Parallels.com>2012-08-24 13:10:28 +0400
commitc5daa6a91984a296446b33d6e13ff802af9dc352 (patch)
tree69fb1b4ef4107b4a19bf3bc4ed8e981425a50211 /drivers/scsi/megaraid
parentb5e5ddcdeee816053478e3fe1be7dc4ae65019d7 (diff)
downloadblackbird-op-linux-c5daa6a91984a296446b33d6e13ff802af9dc352.tar.gz
blackbird-op-linux-c5daa6a91984a296446b33d6e13ff802af9dc352.zip
[SCSI] megaraid_sas: Add throttlequeuedepth module parameter
This allows a user to adjust the queue depth of the adapter when throttled due to I/O timeout. Signed-off-by: Adam Radford <aradford@gmail.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/megaraid')
-rw-r--r--drivers/scsi/megaraid/megaraid_sas.h2
-rw-r--r--drivers/scsi/megaraid/megaraid_sas_base.c30
2 files changed, 29 insertions, 3 deletions
diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index e8f892647681..f65025d63bc8 100644
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -747,6 +747,7 @@ struct megasas_ctrl_info {
#define MEGASAS_RESET_NOTICE_INTERVAL 5
#define MEGASAS_IOCTL_CMD 0
#define MEGASAS_DEFAULT_CMD_TIMEOUT 90
+#define MEGASAS_THROTTLE_QUEUE_DEPTH 16
/*
* FW reports the maximum of number of commands that it can accept (maximum
@@ -1364,6 +1365,7 @@ struct megasas_instance {
unsigned long bar;
long reset_flags;
struct mutex reset_mutex;
+ int throttlequeuedepth;
};
enum {
diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index dc27598785e5..f8f0a165dfb6 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -71,6 +71,11 @@ static int msix_disable;
module_param(msix_disable, int, S_IRUGO);
MODULE_PARM_DESC(msix_disable, "Disable MSI-X interrupt handling. Default: 0");
+static int throttlequeuedepth = MEGASAS_THROTTLE_QUEUE_DEPTH;
+module_param(throttlequeuedepth, int, S_IRUGO);
+MODULE_PARM_DESC(throttlequeuedepth,
+ "Adapter queue depth when throttled due to I/O timeout. Default: 16");
+
MODULE_LICENSE("GPL");
MODULE_VERSION(MEGASAS_VERSION);
MODULE_AUTHOR("megaraidlinux@lsi.com");
@@ -1595,8 +1600,9 @@ megasas_check_and_restore_queue_depth(struct megasas_instance *instance)
{
unsigned long flags;
if (instance->flag & MEGASAS_FW_BUSY
- && time_after(jiffies, instance->last_time + 5 * HZ)
- && atomic_read(&instance->fw_outstanding) < 17) {
+ && time_after(jiffies, instance->last_time + 5 * HZ)
+ && atomic_read(&instance->fw_outstanding) <
+ instance->throttlequeuedepth + 1) {
spin_lock_irqsave(instance->host->host_lock, flags);
instance->flag &= ~MEGASAS_FW_BUSY;
@@ -1914,7 +1920,7 @@ blk_eh_timer_return megasas_reset_timer(struct scsi_cmnd *scmd)
/* FW is busy, throttle IO */
spin_lock_irqsave(instance->host->host_lock, flags);
- instance->host->can_queue = 16;
+ instance->host->can_queue = instance->throttlequeuedepth;
instance->last_time = jiffies;
instance->flag |= MEGASAS_FW_BUSY;
@@ -3577,6 +3583,24 @@ static int megasas_init_fw(struct megasas_instance *instance)
kfree(ctrl_info);
+ /* Check for valid throttlequeuedepth module parameter */
+ if (instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0073SKINNY ||
+ instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0071SKINNY) {
+ if (throttlequeuedepth > (instance->max_fw_cmds -
+ MEGASAS_SKINNY_INT_CMDS))
+ instance->throttlequeuedepth =
+ MEGASAS_THROTTLE_QUEUE_DEPTH;
+ else
+ instance->throttlequeuedepth = throttlequeuedepth;
+ } else {
+ if (throttlequeuedepth > (instance->max_fw_cmds -
+ MEGASAS_INT_CMDS))
+ instance->throttlequeuedepth =
+ MEGASAS_THROTTLE_QUEUE_DEPTH;
+ else
+ instance->throttlequeuedepth = throttlequeuedepth;
+ }
+
/*
* Setup tasklet for cmd completion
*/
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