[SCSI] mptfusion: Better handling of DEAD IOC PCI-E Link down error condition

Find Non-Operation IOC and remove it from OS: Detecting
dead(non-functional) ioc will be done reading doorbell register value
from fault reset thread, which has been called from work thread
context after each specific interval. If doorbell value is 0xFFFFFFFF,
it will be considered as IOC is non-operational and marked as dead
ioc.

Once Dead IOC has been detected, it will be removed at pci layer using
"pci_remove_bus_device" API.

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 38 insertions, 28 deletions

diff --git a/drivers/message/fusion/mptbase.h b/drivers/message/fusion/mptbase.h
index fe902338539b..69ddabd51958 100644
--- a/drivers/message/fusion/mptbase.h
+++ b/drivers/message/fusion/mptbase.h
@@ -554,10 +554,47 @@ struct mptfc_rport_info
         u8              flags;
 };
 
+/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
+
+/*
+ * MPT_SCSI_HOST defines - Used by the IOCTL and the SCSI drivers
+ * Private to the driver.
+ */
+
+#define MPT_HOST_BUS_UNKNOWN            (0xFF)
+#define MPT_HOST_TOO_MANY_TM            (0x05)
+#define MPT_HOST_NVRAM_INVALID          (0xFFFFFFFF)
+#define MPT_HOST_NO_CHAIN               (0xFFFFFFFF)
+#define MPT_NVRAM_MASK_TIMEOUT          (0x000000FF)
+#define MPT_NVRAM_SYNC_MASK             (0x0000FF00)
+#define MPT_NVRAM_SYNC_SHIFT            (8)
+#define MPT_NVRAM_DISCONNECT_ENABLE     (0x00010000)
+#define MPT_NVRAM_ID_SCAN_ENABLE        (0x00020000)
+#define MPT_NVRAM_LUN_SCAN_ENABLE       (0x00040000)
+#define MPT_NVRAM_TAG_QUEUE_ENABLE      (0x00080000)
+#define MPT_NVRAM_WIDE_DISABLE          (0x00100000)
+#define MPT_NVRAM_BOOT_CHOICE           (0x00200000)
+
+typedef enum {
+        FC,
+        SPI,
+        SAS
+} BUS_TYPE;
+
+typedef struct _MPT_SCSI_HOST {
+        struct _MPT_ADAPTER              *ioc;
+        ushort                    sel_timeout[MPT_MAX_FC_DEVICES];
+        char                      *info_kbuf;
+        long                      last_queue_full;
+        u16                       spi_pending;
+        struct list_head          target_reset_list;
+} MPT_SCSI_HOST;
+
 typedef void (*MPT_ADD_SGE)(void *pAddr, u32 flagslength, dma_addr_t dma_addr);
 typedef void (*MPT_ADD_CHAIN)(void *pAddr, u8 next, u16 length,
                 dma_addr_t dma_addr);
 typedef void (*MPT_SCHEDULE_TARGET_RESET)(void *ioc);
+typedef void (*MPT_FLUSH_RUNNING_CMDS)(MPT_SCSI_HOST *hd);
 
 /*
  *  Adapter Structure - pci_dev specific. Maximum: MPT_MAX_ADAPTERS
@@ -717,6 +754,7 @@ typedef struct _MPT_ADAPTER
         u8                       taskmgmt_quiesce_io;
         u8                       ioc_reset_in_progress;
         MPT_SCHEDULE_TARGET_RESET schedule_target_reset;
+        MPT_FLUSH_RUNNING_CMDS schedule_dead_ioc_flush_running_cmds;
         struct work_struct       sas_persist_task;
 
         struct work_struct       fc_setup_reset_work;
@@ -830,19 +868,6 @@ typedef struct _MPT_LOCAL_REPLY {
         u32     pad;
 } MPT_LOCAL_REPLY;
 
-#define MPT_HOST_BUS_UNKNOWN            (0xFF)
-#define MPT_HOST_TOO_MANY_TM            (0x05)
-#define MPT_HOST_NVRAM_INVALID          (0xFFFFFFFF)
-#define MPT_HOST_NO_CHAIN               (0xFFFFFFFF)
-#define MPT_NVRAM_MASK_TIMEOUT          (0x000000FF)
-#define MPT_NVRAM_SYNC_MASK             (0x0000FF00)
-#define MPT_NVRAM_SYNC_SHIFT            (8)
-#define MPT_NVRAM_DISCONNECT_ENABLE     (0x00010000)
-#define MPT_NVRAM_ID_SCAN_ENABLE        (0x00020000)
-#define MPT_NVRAM_LUN_SCAN_ENABLE       (0x00040000)
-#define MPT_NVRAM_TAG_QUEUE_ENABLE      (0x00080000)
-#define MPT_NVRAM_WIDE_DISABLE          (0x00100000)
-#define MPT_NVRAM_BOOT_CHOICE           (0x00200000)
 
 /* The TM_STATE variable is used to provide strict single threading of TM
  * requests as well as communicate TM error conditions.
@@ -851,21 +876,6 @@ typedef struct _MPT_LOCAL_REPLY {
 #define TM_STATE_IN_PROGRESS   (1)
 #define TM_STATE_ERROR         (2)
 
-typedef enum {
-        FC,
-        SPI,
-        SAS
-} BUS_TYPE;
-
-typedef struct _MPT_SCSI_HOST {
-        MPT_ADAPTER              *ioc;
-        ushort                    sel_timeout[MPT_MAX_FC_DEVICES];
-        char                      *info_kbuf;
-        long                      last_queue_full;
-        u16                       spi_pending;
-        struct list_head          target_reset_list;
-} MPT_SCSI_HOST;
-
 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
 /*
  *      More Dynamic Multi-Pathing stuff...