b312fc
From b004a9938ed1a8bb2007d0442512c6802c3a6bd1 Mon Sep 17 00:00:00 2001
b312fc
From: Sasikumar Chandrasekaran <sasikumar.pc@broadcom.com>
b312fc
Date: Tue, 10 Jan 2017 18:20:45 -0500
b312fc
Subject: [PATCH 03/11] scsi: megaraid_sas: EEDP Escape Mode Support for SAS3.5
b312fc
 Generic Megaraid Controllers
b312fc
b312fc
An UNMAP command on a PI formatted device will leave the Logical Block Application
b312fc
Tag and Logical Block Reference Tag as all F's (for those LBAs that are unmapped).
b312fc
To avoid IO errors if those LBAs are subsequently read before they are written with
b312fc
valid tag fields, the MPI SCSI IO requests need to set the EEDPFlags element EEDP
b312fc
Escape Mode field, Bits [7:6] appropriately.  A value of 2 should be set to disable
b312fc
all PI checks if the Logical Block Application Tag is 0xFFFF for PI types 1 and 2.
b312fc
A value of 3 should be set to disable all PI checks if the Logical Block Application
b312fc
Tag is 0xFFFF and the Logical Block Reference Tag is 0xFFFFFFFF for PI type 3.
b312fc
b312fc
Signed-off-by: Sasikumar Chandrasekaran <sasikumar.pc@broadcom.com>
b312fc
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
b312fc
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
b312fc
---
b312fc
 drivers/scsi/megaraid/megaraid_sas_fusion.c | 1 +
b312fc
 drivers/scsi/megaraid/megaraid_sas_fusion.h | 2 ++
b312fc
 2 files changed, 3 insertions(+)
b312fc
b312fc
diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
b312fc
index c64b85a..27c6a1f 100644
b312fc
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
b312fc
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
b312fc
@@ -1589,6 +1589,7 @@ megasas_set_pd_lba(struct MPI2_RAID_SCSI_IO_REQUEST *io_request, u8 cdb_len,
b312fc
 				MPI2_SCSIIO_EEDPFLAGS_CHECK_REFTAG |
b312fc
 				MPI2_SCSIIO_EEDPFLAGS_CHECK_REMOVE_OP |
b312fc
 				MPI2_SCSIIO_EEDPFLAGS_CHECK_APPTAG |
b312fc
+				MPI25_SCSIIO_EEDPFLAGS_DO_NOT_DISABLE_MODE |
b312fc
 				MPI2_SCSIIO_EEDPFLAGS_CHECK_GUARD);
b312fc
 		} else {
b312fc
 			io_request->EEDPFlags = cpu_to_le16(
b312fc
diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.h b/drivers/scsi/megaraid/megaraid_sas_fusion.h
b312fc
index 80eaee2..3cd3d0a 100644
b312fc
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.h
b312fc
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.h
b312fc
@@ -175,6 +175,8 @@ enum REGION_TYPE {
b312fc
 #define MPI2_SCSIIO_EEDPFLAGS_CHECK_APPTAG          (0x0200)
b312fc
 #define MPI2_SCSIIO_EEDPFLAGS_CHECK_GUARD           (0x0100)
b312fc
 #define MPI2_SCSIIO_EEDPFLAGS_INSERT_OP             (0x0004)
b312fc
+/* EEDP escape mode */
b312fc
+#define MPI25_SCSIIO_EEDPFLAGS_DO_NOT_DISABLE_MODE  (0x0040)
b312fc
 #define MPI2_FUNCTION_SCSI_IO_REQUEST               (0x00) /* SCSI IO */
b312fc
 #define MPI2_FUNCTION_SCSI_TASK_MGMT                (0x01)
b312fc
 #define MPI2_REQ_DESCRIPT_FLAGS_HIGH_PRIORITY       (0x03)
b312fc
-- 
b312fc
1.8.3.1
b312fc