From 9bcb1d5a3d10f4d15da2174f8eaec942602f681f Mon Sep 17 00:00:00 2001 From: Chandrakanth Patil Date: Thu, 2 Mar 2023 16:23:41 +0530 Subject: 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 Signed-off-by: Sumit Saxena Link: https://lore.kernel.org/r/20230302105342.34933-3-chandrakanth.patil@broadcom.com Signed-off-by: Martin K. Petersen --- drivers/scsi/megaraid/megaraid_sas.h | 6 ++++-- drivers/scsi/megaraid/megaraid_sas_fusion.c | 3 +++ 2 files changed, 7 insertions(+), 2 deletions(-) (limited to 'drivers/scsi/megaraid') diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h index 2ef9d41fc6f4..c2bace65105b 100644 --- a/drivers/scsi/megaraid/megaraid_sas.h +++ b/drivers/scsi/megaraid/megaraid_sas.h @@ -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; diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c index 6597e118c805..84c9a55a5794 100644 --- a/drivers/scsi/megaraid/megaraid_sas_fusion.c +++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c @@ -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; -- cgit v1.2.3