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megaraid_sas: reduce memory footprints in kdump mode

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This patch will reduce memory footprints of megaraid_sas driver when
booted in kdump mode.  Driver will not allocate memory for optional and
perfromance oriented features.  Below are key changes done in
megaraid_sas driver to do this:

1. Limit Controller's queue depth to 100 in kdump mode.

2. Do not allocate memory for system info buffer and PD info buffer.

3. Disable performance oriented features e.g. Disable RDPQ mode, disable
   dual queue depth, restrict to single MSI-x vector.

Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Reviewed-by: Hannes Reinicke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Sumit Saxena
2016-04-15 00:23:30 -07:00
committed by Martin K. Petersen
parent 1f275f976f
commit c3e385a1b9
3 changed files with 34 additions and 19 deletions
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3
drivers/scsi/megaraid/megaraid_sas_fusion.c
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@@ -257,6 +257,9 @@ megasas_fusion_update_can_queue(struct megasas_instance *instance, int fw_boot_c
if (!instance->is_rdpq)
instance->max_fw_cmds = min_t(u16, instance->max_fw_cmds, 1024);
if (reset_devices)
instance->max_fw_cmds = min(instance->max_fw_cmds,
(u16)MEGASAS_KDUMP_QUEUE_DEPTH);
/*
* Reduce the max supported cmds by 1. This is to ensure that the
* reply_q_sz (1 more than the max cmd that driver may send)