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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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8
drivers/scsi/megaraid/megaraid_sas_fusion.h
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@@ -643,7 +643,8 @@ struct MR_SPAN_BLOCK_INFO {
struct MR_LD_RAID {
struct {
#if defined(__BIG_ENDIAN_BITFIELD)
u32 reserved4:6;
u32 reserved4:5;
u32 fpBypassRegionLock:1;
u32 tmCapable:1;
u32 fpNonRWCapable:1;
u32 fpReadAcrossStripe:1;
@@ -667,7 +668,8 @@ struct MR_LD_RAID {
u32 fpReadAcrossStripe:1;
u32 fpNonRWCapable:1;
u32 tmCapable:1;
u32 reserved4:6;
u32 fpBypassRegionLock:1;
u32 reserved4:5;
#endif
} capability;
__le32 reserved6;
@@ -737,7 +739,7 @@ struct IO_REQUEST_INFO {
u8 fpOkForIo;
u8 IoforUnevenSpan;
u8 start_span;
u8 reserved;
u8 do_fp_rlbypass;
u64 start_row;
u8 span_arm; /* span[7:5], arm[4:0] */
u8 pd_after_lb;