megaraid_sas: JBOD sequence number support

Implemented JBOD map which will provide quick access for JBOD path and
also provide sequence number.  This will help hardware to fail command
to the FW in case of any sequence mismatch.

Fast Path I/O for JBOD will refer JBOD map (which has sequence number
per JBOD device) instead of RAID map.  Previously, the driver used RAID
map to get device handle for fast path I/O and this not have sequence
number information. Now, driver will use JBOD map instead.  As part of
error handling, if JBOD map is failed/not supported by firmware, driver
will continue using legacy behavior.

Now there will be three IO paths for JBOD (syspd):

 - JBOD map with sequence number (Fast Path)
 - RAID map without sequence number (Fast Path)
 - FW path via h/w exception queue deliberately setup devhandle
   0xFFFF (FW path).

Relevant data structures:

 - Driver send new DCMD MR_DCMD_SYSTEM_PD_MAP_GET_INFO for this purpose.
 - struct MR_PD_CFG_SEQ- This structure represent map of single physical
   device.
 - struct MR_PD_CFG_SEQ_NUM_SYNC- This structure represent whole JBOD
   map in general(size, count of sysPDs configured, struct MR_PD_CFG_SEQ
   of syspD with 0 index).
 - JBOD sequence map size is: sizeof(struct MR_PD_CFG_SEQ_NUM_SYNC)
   + (sizeof(struct MR_PD_CFG_SEQ) * (MAX_PHYSICAL_DEVICES - 1)) which
   is allocated while setting up JBOD map at driver load time.

Signed-off-by: Sumit Saxena <sumit.saxena@avagotech.com>
Signed-off-by: Kashyap Desai <kashyap.desai@avagotech.com>
Reviewed-by: Martin Petersen <martin.petersen@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.h b/drivers/scsi/megaraid/megaraid_sas_fusion.h
index be1be8e1a0e9..41f3d8b6dc63 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.h
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.h
@@ -89,6 +89,7 @@ enum MR_RAID_FLAGS_IO_SUB_TYPE {
 #define MEGASAS_FP_CMD_LEN	16
 #define MEGASAS_FUSION_IN_RESET 0
 #define THRESHOLD_REPLY_COUNT 50
+#define JBOD_MAPS_COUNT	2
 
 /*
  * Raid Context structure which describes MegaRAID specific IO Parameters
@@ -487,6 +488,7 @@ struct MPI2_IOC_INIT_REQUEST {
 #define MAX_PHYSICAL_DEVICES 256
 #define MAX_RAIDMAP_PHYSICAL_DEVICES (MAX_PHYSICAL_DEVICES)
 #define MR_DCMD_LD_MAP_GET_INFO             0x0300e101
+#define MR_DCMD_SYSTEM_PD_MAP_GET_INFO      0x0200e102
 #define MR_DCMD_CTRL_SHARED_HOST_MEM_ALLOC  0x010e8485   /* SR-IOV HB alloc*/
 #define MR_DCMD_LD_VF_MAP_GET_ALL_LDS_111   0x03200200
 #define MR_DCMD_LD_VF_MAP_GET_ALL_LDS       0x03150200
@@ -790,6 +792,21 @@ struct MR_FW_RAID_MAP_EXT {
 	struct MR_LD_SPAN_MAP      ldSpanMap[MAX_LOGICAL_DRIVES_EXT];
 };
 
+/*
+ *  * define MR_PD_CFG_SEQ structure for system PDs
+ *   */
+struct MR_PD_CFG_SEQ {
+	__le16 seqNum;
+	__le16 devHandle;
+	u8  reserved[4];
+} __packed;
+
+struct MR_PD_CFG_SEQ_NUM_SYNC {
+	__le32 size;
+	__le32 count;
+	struct MR_PD_CFG_SEQ seq[1];
+} __packed;
+
 struct fusion_context {
 	struct megasas_cmd_fusion **cmd_list;
 	dma_addr_t req_frames_desc_phys;
@@ -829,6 +846,8 @@ struct fusion_context {
 	u32 current_map_sz;
 	u32 drv_map_sz;
 	u32 drv_map_pages;
+	struct MR_PD_CFG_SEQ_NUM_SYNC	*pd_seq_sync[JBOD_MAPS_COUNT];
+	dma_addr_t pd_seq_phys[JBOD_MAPS_COUNT];
 	u8 fast_path_io;
 	struct LD_LOAD_BALANCE_INFO load_balance_info[MAX_LOGICAL_DRIVES_EXT];
 	LD_SPAN_INFO log_to_span[MAX_LOGICAL_DRIVES_EXT];