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