storvsc: ring buffer failures may result in I/O freeze

[cascardo/linux.git] / drivers / scsi / NCR5380.h

diff --git a/drivers/scsi/NCR5380.h b/drivers/scsi/NCR5380.h
index c79ddfa..162112d 100644 (file)
--- a/drivers/scsi/NCR5380.h
+++ b/drivers/scsi/NCR5380.h
@@ -7,8 +7,6 @@
  *     drew@colorado.edu
  *      +1 (303) 666-5836
  *
- * DISTRIBUTION RELEASE 7
- *
  * For more information, please consult 
  *
  * NCR 5380 Family
@@ -25,13 +23,7 @@
 #define NCR5380_H
 
 #include <linux/interrupt.h>
-
-#ifdef AUTOSENSE
 #include <scsi/scsi_eh.h>
-#endif
-
-#define NCR5380_PUBLIC_RELEASE 7
-#define NCR53C400_PUBLIC_RELEASE 2
 
 #define NDEBUG_ARBITRATION     0x1
 #define NDEBUG_AUTOSENSE       0x2
@@ -224,33 +216,44 @@
 #define DISCONNECT_LONG                2
 
 /* 
- * These are "special" values for the tag parameter passed to NCR5380_select.
+ * "Special" value for the (unsigned char) command tag, to indicate
+ * I_T_L nexus instead of I_T_L_Q.
  */
 
-#define TAG_NEXT       -1      /* Use next free tag */
-#define TAG_NONE       -2      /* 
-                                * Establish I_T_L nexus instead of I_T_L_Q
-                                * even on SCSI-II devices.
-                                */
+#define TAG_NONE       0xff
 
 /*
  * These are "special" values for the irq and dma_channel fields of the 
  * Scsi_Host structure
  */
 
-#define SCSI_IRQ_NONE  255
 #define DMA_NONE       255
 #define IRQ_AUTO       254
 #define DMA_AUTO       254
 #define PORT_AUTO      0xffff  /* autoprobe io port for 53c400a */
 
+#ifndef NO_IRQ
+#define NO_IRQ         0
+#endif
+
 #define FLAG_HAS_LAST_BYTE_SENT                1       /* NCR53c81 or better */
 #define FLAG_CHECK_LAST_BYTE_SENT      2       /* Only test once */
 #define FLAG_NCR53C400                 4       /* NCR53c400 */
 #define FLAG_NO_PSEUDO_DMA             8       /* Inhibit DMA */
 #define FLAG_DTC3181E                  16      /* DTC3181E */
+#define FLAG_LATE_DMA_SETUP            32      /* Setup NCR before DMA H/W */
+#define FLAG_TAGGED_QUEUING            64      /* as X3T9.2 spelled it */
 
 #ifndef ASM
+
+#ifdef SUPPORT_TAGS
+struct tag_alloc {
+       DECLARE_BITMAP(allocated, MAX_TAGS);
+       int nr_allocated;
+       int queue_size;
+};
+#endif
+
 struct NCR5380_hostdata {
        NCR5380_implementation_fields;          /* implementation specific */
        struct Scsi_Host *host;                 /* Host backpointer */
@@ -263,9 +266,9 @@ struct NCR5380_hostdata {
        volatile int dma_len;                   /* requested length of DMA */
 #endif
        volatile unsigned char last_message;    /* last message OUT */
-       volatile Scsi_Cmnd *connected;          /* currently connected command */
-       volatile Scsi_Cmnd *issue_queue;        /* waiting to be issued */
-       volatile Scsi_Cmnd *disconnected_queue; /* waiting for reconnect */
+       volatile struct scsi_cmnd *connected;   /* currently connected command */
+       volatile struct scsi_cmnd *issue_queue; /* waiting to be issued */
+       volatile struct scsi_cmnd *disconnected_queue;  /* waiting for reconnect */
        volatile int restart_select;            /* we have disconnected,
                                                   used to restart 
                                                   NCR5380_select() */
@@ -273,19 +276,21 @@ struct NCR5380_hostdata {
        int flags;
        unsigned long time_expires;             /* in jiffies, set prior to sleeping */
        int select_time;                        /* timer in select for target response */
-       volatile Scsi_Cmnd *selecting;
+       volatile struct scsi_cmnd *selecting;
        struct delayed_work coroutine;          /* our co-routine */
-#ifdef NCR5380_STATS
-       unsigned timebase;                      /* Base for time calcs */
-       long time_read[8];                      /* time to do reads */
-       long time_write[8];                     /* time to do writes */
-       unsigned long bytes_read[8];            /* bytes read */
-       unsigned long bytes_write[8];           /* bytes written */
-       unsigned pendingr;
-       unsigned pendingw;
-#endif
-#ifdef AUTOSENSE
        struct scsi_eh_save ses;
+       char info[256];
+       int read_overruns;                /* number of bytes to cut from a
+                                          * transfer to handle chip overruns */
+       int retain_dma_intr;
+       struct work_struct main_task;
+       volatile int main_running;
+#ifdef SUPPORT_TAGS
+       struct tag_alloc TagAlloc[8][8];        /* 8 targets and 8 LUNs */
+#endif
+#ifdef PSEUDO_DMA
+       unsigned spin_max_r;
+       unsigned spin_max_w;
 #endif
 };
 
@@ -296,7 +301,8 @@ struct NCR5380_hostdata {
 #endif
 
 #define dprintk(flg, fmt, ...) \
-       do { if ((NDEBUG) & (flg)) pr_debug(fmt, ## __VA_ARGS__); } while (0)
+       do { if ((NDEBUG) & (flg)) \
+               printk(KERN_DEBUG fmt, ## __VA_ARGS__); } while (0)
 
 #if NDEBUG
 #define NCR5380_dprint(flg, arg) \
@@ -320,17 +326,9 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance);
 static irqreturn_t NCR5380_intr(int irq, void *dev_id);
 #endif
 static void NCR5380_main(struct work_struct *work);
-static void __maybe_unused NCR5380_print_options(struct Scsi_Host *instance);
-static int NCR5380_abort(Scsi_Cmnd * cmd);
-static int NCR5380_bus_reset(Scsi_Cmnd * cmd);
-static int NCR5380_queue_command(struct Scsi_Host *, struct scsi_cmnd *);
-static int __maybe_unused NCR5380_show_info(struct seq_file *,
-       struct Scsi_Host *);
-static int __maybe_unused NCR5380_write_info(struct Scsi_Host *instance,
-       char *buffer, int length);
-
+static const char *NCR5380_info(struct Scsi_Host *instance);
 static void NCR5380_reselect(struct Scsi_Host *instance);
-static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd * cmd, int tag);
+static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd);
 #if defined(PSEUDO_DMA) || defined(REAL_DMA) || defined(REAL_DMA_POLL)
 static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data);
 #endif