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scsi: megaraid_sas: Add crash dump mode capability bit in MFI capabilities 

In kdump kernel mode, the driver works in reduced functionality mode with
some features disabled such as reduced MSI-X count and RDPQ disabled, etc.
However, the firmware is not aware of this mode in some cases, which
results in undefined behavior.

To address this, the driver informs the firmware about the kdump mode
through MPI capabilities bit during driver initialization.  This allows
firmware to adjust its behavior accordingly.

Signed-off-by: Chandrakanth Patil <chandrakanth.patil@broadcom.com>
Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Link: https://lore.kernel.org/r/20230302105342.34933-3-chandrakanth.patil@broadcom.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Chandrakanth Patil 2023-03-02 16:23:41 +05:30 committed by Martin K. Petersen
parent bfa659177d
commit 9bcb1d5a3d
2 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/scsi/megaraid/megaraid_sas.h
View File

@ -1760,7 +1760,8 @@ union megasas_sgl_frame {
typedef union _MFI_CAPABILITIES {
struct {
#if defined(__BIG_ENDIAN_BITFIELD)
u32 reserved:16;
u32 reserved:15;
u32 support_memdump:1;
u32 support_fw_exposed_dev_list:1;
u32 support_nvme_passthru:1;
u32 support_64bit_mode:1;
@ -1794,7 +1795,8 @@ typedef union _MFI_CAPABILITIES {
u32 support_64bit_mode:1;
u32 support_nvme_passthru:1;
u32 support_fw_exposed_dev_list:1;
u32 reserved:16;
u32 support_memdump:1;
u32 reserved:15;
#endif
} mfi_capabilities;
__le32 reg;

3
drivers/scsi/megaraid/megaraid_sas_fusion.c
View File

@ -1201,6 +1201,9 @@ megasas_ioc_init_fusion(struct megasas_instance *instance)
drv_ops->mfi_capabilities.support_nvme_passthru = 1;
drv_ops->mfi_capabilities.support_fw_exposed_dev_list = 1;
if (reset_devices)
drv_ops->mfi_capabilities.support_memdump = 1;
if (instance->consistent_mask_64bit)
drv_ops->mfi_capabilities.support_64bit_mode = 1;