[PATCH 2/3] megaraid_sas: Add crash dump mode capability bit in MFI capabilities

[Chandrakanth Patil <chandrakanth.patil@broadcom.com>]

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In kdump kernel mode, the driver works in reduced functionality mode with
some features disabled such as reduced MSIX 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
driver through MPI capabilities bit during driver initialization.
So firmware can adjust its behavior accordingly.

Signed-off-by: Chandrakanth Patil <chandrakanth.patil@broadcom.com>
Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
---
 drivers/scsi/megaraid/megaraid_sas.h        | 6 ++++--
 drivers/scsi/megaraid/megaraid_sas_fusion.c | 3 +++
 2 files changed, 7 insertions(+), 2 deletions(-)

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 fe70f8f11435..7ebfbe0c2ba7 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;
 
-- 
2.31.1


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