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megaraid_sas: Fastpath region lock bypass

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Firmware will fill out per-LD data to tell driver whether a particular
LD supports region lock bypass. If yes, then driver will send non-FP
LDIO to region lock bypass FIFO. With this change in driver, firmware
will optimize certain code to improve performance.

Signed-off-by: Kashyap Desai <kashyap.desai@avagotech.com>
Signed-off-by: Sumit Saxena <sumit.saxena@avagotech.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Sumit Saxena
2016-01-28 21:04:27 +05:30
committed by Martin K. Petersen
parent 2216c30523
commit 8f05024cd3
4 changed files with 17 additions and 7 deletions
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drivers/scsi/megaraid/megaraid_sas_fp.c
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@@ -1020,6 +1020,8 @@ MR_BuildRaidContext(struct megasas_instance *instance,
/* assume this IO needs the full row - we'll adjust if not true */
regSize = stripSize;
io_info->do_fp_rlbypass = raid->capability.fpBypassRegionLock;
/* Check if we can send this I/O via FastPath */
if (raid->capability.fpCapable) {
if (isRead)