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megaraid_sas: IO throttling support 

This patch will add capability in driver to tell firmware that it can
throttle IOs in case controller's queue depth is downgraded post OFU
(online firmware upgrade). This feature will ensure firmware can be
downgraded from higher queue depth to lower queue depth without needing
system reboot. Added throttling code in IO path of driver, in case OS
tries to send more IOs than post OFU firmware's queue depth.

Signed-off-by: Sumit Saxena <sumit.saxena@avagotech.com>
Signed-off-by: Kashyap Desai <kashyap.desai@avagotech.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Sumit Saxena 2016-01-28 21:04:31 +05:30 committed by Martin K. Petersen
parent 308ec459bc
commit 52b62ac7c6
2 changed files with 5 additions and 2 deletions
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6
drivers/scsi/megaraid/megaraid_sas.h
View File

@ -1537,7 +1537,8 @@ union megasas_sgl_frame {
typedef union _MFI_CAPABILITIES {
struct {
#if defined(__BIG_ENDIAN_BITFIELD)
u32 reserved:21;
u32 reserved:20;
u32 support_qd_throttling:1;
u32 support_fp_rlbypass:1;
u32 support_vfid_in_ioframe:1;
u32 support_ext_io_size:1;
@ -1561,7 +1562,8 @@ typedef union _MFI_CAPABILITIES {
u32 support_ext_io_size:1;
u32 support_vfid_in_ioframe:1;
u32 support_fp_rlbypass:1;
u32 reserved:21;
u32 support_qd_throttling:1;
u32 reserved:20;
#endif
} mfi_capabilities;
__le32 reg;

1
drivers/scsi/megaraid/megaraid_sas_fusion.c
View File

@ -803,6 +803,7 @@ megasas_ioc_init_fusion(struct megasas_instance *instance)
if (!dual_qdepth_disable)
drv_ops->mfi_capabilities.support_ext_queue_depth = 1;
drv_ops->mfi_capabilities.support_qd_throttling = 1;
/* Convert capability to LE32 */
cpu_to_le32s((u32 *)&init_frame->driver_operations.mfi_capabilities);