[SCSI] fnic: fnic driver may hit BUG_ON on device reset

[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / scsi / fnic / fnic.h

diff --git a/drivers/scsi/fnic/fnic.h b/drivers/scsi/fnic/fnic.h
index 95a5ba2..b8e6644 100644 (file)
--- a/drivers/scsi/fnic/fnic.h
+++ b/drivers/scsi/fnic/fnic.h
@@ -56,6 +56,19 @@
 #define FNIC_NO_TAG             -1
 
 /*
+ * Command flags to identify the type of command and for other future
+ * use.
+ */
+#define FNIC_NO_FLAGS                  0
+#define FNIC_CDB_REQ                   BIT(1)  /* All IOs with a valid CDB */
+#define FNIC_BLOCKING_REQ              BIT(2)  /* All blocking Requests */
+#define FNIC_DEVICE_RESET              BIT(3)  /* Device reset request */
+#define FNIC_DEV_RST_PENDING           BIT(4)  /* Device reset pending */
+#define FNIC_DEV_RST_TIMED_OUT         BIT(5)  /* Device reset timed out */
+#define FNIC_DEV_RST_TERM_ISSUED       BIT(6)  /* Device reset terminate */
+#define FNIC_DEV_RST_DONE              BIT(7)  /* Device reset done */
+
+/*
  * Usage of the scsi_cmnd scratchpad.
  * These fields are locked by the hashed io_req_lock.
  */
@@ -64,6 +77,7 @@
 #define CMD_ABTS_STATUS(Cmnd)  ((Cmnd)->SCp.Message)
 #define CMD_LR_STATUS(Cmnd)    ((Cmnd)->SCp.have_data_in)
 #define CMD_TAG(Cmnd)           ((Cmnd)->SCp.sent_command)
+#define CMD_FLAGS(Cmnd)         ((Cmnd)->SCp.Status)
 
 #define FCPIO_INVALID_CODE 0x100 /* hdr_status value unused by firmware */
 
@@ -71,9 +85,28 @@
 #define FNIC_HOST_RESET_TIMEOUT             10000      /* mSec */
 #define FNIC_RMDEVICE_TIMEOUT        1000       /* mSec */
 #define FNIC_HOST_RESET_SETTLE_TIME  30         /* Sec */
+#define FNIC_ABT_TERM_DELAY_TIMEOUT  500        /* mSec */
 
 #define FNIC_MAX_FCP_TARGET     256
 
+/**
+ * state_flags to identify host state along along with fnic's state
+ **/
+#define __FNIC_FLAGS_FWRESET           BIT(0) /* fwreset in progress */
+#define __FNIC_FLAGS_BLOCK_IO          BIT(1) /* IOs are blocked */
+
+#define FNIC_FLAGS_NONE                        (0)
+#define FNIC_FLAGS_FWRESET             (__FNIC_FLAGS_FWRESET | \
+                                       __FNIC_FLAGS_BLOCK_IO)
+
+#define FNIC_FLAGS_IO_BLOCKED          (__FNIC_FLAGS_BLOCK_IO)
+
+#define fnic_set_state_flags(fnicp, st_flags)  \
+       __fnic_set_state_flags(fnicp, st_flags, 0)
+
+#define fnic_clear_state_flags(fnicp, st_flags)  \
+       __fnic_set_state_flags(fnicp, st_flags, 1)
+
 extern unsigned int fnic_log_level;
 
 #define FNIC_MAIN_LOGGING 0x01
@@ -170,6 +203,9 @@ struct fnic {
 
        struct completion *remove_wait; /* device remove thread blocks */
 
+       atomic_t in_flight;             /* io counter */
+       u32 _reserved;                  /* fill hole */
+       unsigned long state_flags;      /* protected by host lock */
        enum fnic_state state;
        spinlock_t fnic_lock;
 
@@ -267,4 +303,12 @@ const char *fnic_state_to_str(unsigned int state);
 void fnic_log_q_error(struct fnic *fnic);
 void fnic_handle_link_event(struct fnic *fnic);
 
+int fnic_is_abts_pending(struct fnic *, struct scsi_cmnd *);
+
+static inline int
+fnic_chk_state_flags_locked(struct fnic *fnic, unsigned long st_flags)
+{
+       return ((fnic->state_flags & st_flags) == st_flags);
+}
+void __fnic_set_state_flags(struct fnic *, unsigned long, unsigned long);
 #endif /* _FNIC_H_ */