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megaraid_sas: Fastpath region lock bypass 

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 коммит произвёл Martin K. Petersen
Родитель 2216c30523
Коммит 8f05024cd3
4 изменённых файлов: 17 добавлений и 7 удалений
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8
drivers/scsi/megaraid/megaraid_sas.h
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@ -1528,7 +1528,9 @@ union megasas_sgl_frame {
typedef union _MFI_CAPABILITIES {
struct {
#if defined(__BIG_ENDIAN_BITFIELD)
u32 reserved:23;
u32 reserved:21;
u32 support_fp_rlbypass:1;
u32 support_vfid_in_ioframe:1;
u32 support_ext_io_size:1;
u32 support_ext_queue_depth:1;
u32 security_protocol_cmds_fw:1;
@ -1548,7 +1550,9 @@ typedef union _MFI_CAPABILITIES {
u32 security_protocol_cmds_fw:1;
u32 support_ext_queue_depth:1;
u32 support_ext_io_size:1;
u32 reserved:23;
u32 support_vfid_in_ioframe:1;
u32 support_fp_rlbypass:1;
u32 reserved:21;
#endif
} mfi_capabilities;
__le32 reg;

2
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)

6
drivers/scsi/megaraid/megaraid_sas_fusion.c
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@ -666,6 +666,8 @@ megasas_ioc_init_fusion(struct megasas_instance *instance)
if (instance->max_chain_frame_sz > MEGASAS_CHAIN_FRAME_SZ_MIN)
drv_ops->mfi_capabilities.support_ext_io_size = 1;
drv_ops->mfi_capabilities.support_fp_rlbypass = 1;
/* Convert capability to LE32 */
cpu_to_le32s((u32 *)&init_frame->driver_operations.mfi_capabilities);
@ -1710,8 +1712,8 @@ megasas_build_ldio_fusion(struct megasas_instance *instance,
(MEGASAS_REQ_DESCRIPT_FLAGS_LD_IO
<< MEGASAS_REQ_DESCRIPT_FLAGS_TYPE_SHIFT);
if (fusion->adapter_type == INVADER_SERIES) {
if (io_request->RaidContext.regLockFlags ==
REGION_TYPE_UNUSED)
if (io_info.do_fp_rlbypass ||
(io_request->RaidContext.regLockFlags == REGION_TYPE_UNUSED))
cmd->request_desc->SCSIIO.RequestFlags =
(MEGASAS_REQ_DESCRIPT_FLAGS_NO_LOCK <<
MEGASAS_REQ_DESCRIPT_FLAGS_TYPE_SHIFT);

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;