isci: Add Support for new TC completion codes

Update the SCI Core to comprehend the changes in the TC completion
codes from A0 to B0.  Specifically, there isnew R_ER code
differences for command and data FISes.

Changes are as follows:

1) 0x16 now additionally indicates an R_ERR received for a COMMAND
FIS being sent to a SATA target.  0x16 for SSP still indicates a
NAK received for a COMMAND frame.  Fix is to retry TC to be compliant
with SATA spec or ensure proper error handling of return value
(not spec compliant I don't believe).
2) 0x1B was previously called DONE_BREAK_RCVD for STP and
DONE_LL_ABORT_ERR for SSP.  Now it is universally called
DONE_LL_ABORT_ERR.  This is purely a superficial change.
3) 0x32 is no longer a reserved code.  Now it indicates
DONE_CMD_SDMA_ERR for STP/SSP.  There was a fatal error on the
SDMA for a command IU (includes Raw frames).  Consider retry,
but at a minimum gracefully fail the request.
4) 0x33 is no longer a reserved code.  Now it indicates
DONE_CMD_LL_ABORT_ERR for SSP.  There was a break receivd
during transmission of a command IU.  Consider retry, but
at a minimum gracefully fail the request.

Signed-off-by: Tomasz Chudy <Tomasz.Chudy@intel.com>
Signed-off-by: Jacek Danecki <Jacek.Danecki@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

2 files changed, 5 insertions, 0 deletions

diff --git a/drivers/scsi/isci/core/scic_sds_stp_request.c b/drivers/scsi/isci/core/scic_sds_stp_request.c
index 0b6b0552186a..6d280c0a2fc3 100644
--- a/drivers/scsi/isci/core/scic_sds_stp_request.c
+++ b/drivers/scsi/isci/core/scic_sds_stp_request.c
@@ -1602,9 +1602,11 @@ static enum sci_status scic_sds_stp_request_udma_await_tc_completion_tc_completi
         /*
          * / @todo Check to see if any of these completion status need to wait for
          * /       the device to host register fis. */
+        /* / @todo We can retry the command for SCU_TASK_DONE_CMD_LL_R_ERR - this comes only for B0 */
         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_INV_FIS_LEN):
         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_MAX_PLD_ERR):
         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_LL_R_ERR):
+        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_CMD_LL_R_ERR):
         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_CRC_ERR):
                 scic_sds_remote_device_suspend(
                         this_request->parent.target_device,
diff --git a/drivers/scsi/isci/core/scu_completion_codes.h b/drivers/scsi/isci/core/scu_completion_codes.h
index 17ee4c8b9122..c8b329c695f9 100644
--- a/drivers/scsi/isci/core/scu_completion_codes.h
+++ b/drivers/scsi/isci/core/scu_completion_codes.h
@@ -228,6 +228,7 @@
 #define SCU_TASK_DONE_CHECK_RESPONSE                        ((u32)0x14)
 #define SCU_TASK_DONE_GEN_RESPONSE                          ((u32)0x15)
 #define SCU_TASK_DONE_NAK_CMD_ERR                           ((u32)0x16)
+#define SCU_TASK_DONE_CMD_LL_R_ERR                          ((u32)0x16)
 #define SCU_TASK_DONE_LL_R_ERR                              ((u32)0x17)
 #define SCU_TASK_DONE_ACK_NAK_TO                            ((u32)0x17)
 #define SCU_TASK_DONE_LL_PERR                               ((u32)0x18)
@@ -264,6 +265,8 @@
 #define SCU_TASK_DONE_REG_ERR                               ((u32)0x2E)
 #define SCU_TASK_DONE_SDB_ERR                               ((u32)0x2F)
 #define SCU_TASK_DONE_TASK_ABORT                            ((u32)0x30)
+#define SCU_TASK_DONE_CMD_SDMA_ERR                          ((U32)0x32)
+#define SCU_TASK_DONE_CMD_LL_ABORT_ERR                      ((U32)0x33)
 #define SCU_TASK_OPEN_REJECT_WRONG_DESTINATION              ((u32)0x34)
 #define SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_1             ((u32)0x35)
 #define SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_2             ((u32)0x36)