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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/scsi/arm/queue.h
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/scsi/arm/queue.h')
-rw-r--r--drivers/scsi/arm/queue.h105
1 files changed, 105 insertions, 0 deletions
diff --git a/drivers/scsi/arm/queue.h b/drivers/scsi/arm/queue.h
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+/*
+ * linux/drivers/acorn/scsi/queue.h: queue handling
+ *
+ * Copyright (C) 1997 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef QUEUE_H
+#define QUEUE_H
+
+typedef struct {
+ struct list_head head;
+ struct list_head free;
+ spinlock_t queue_lock;
+ void *alloc; /* start of allocated mem */
+} Queue_t;
+
+/*
+ * Function: void queue_initialise (Queue_t *queue)
+ * Purpose : initialise a queue
+ * Params : queue - queue to initialise
+ */
+extern int queue_initialise (Queue_t *queue);
+
+/*
+ * Function: void queue_free (Queue_t *queue)
+ * Purpose : free a queue
+ * Params : queue - queue to free
+ */
+extern void queue_free (Queue_t *queue);
+
+/*
+ * Function: Scsi_Cmnd *queue_remove (queue)
+ * Purpose : removes first SCSI command from a queue
+ * Params : queue - queue to remove command from
+ * Returns : Scsi_Cmnd if successful (and a reference), or NULL if no command available
+ */
+extern Scsi_Cmnd *queue_remove (Queue_t *queue);
+
+/*
+ * Function: Scsi_Cmnd *queue_remove_exclude_ref (queue, exclude)
+ * Purpose : remove a SCSI command from a queue
+ * Params : queue - queue to remove command from
+ * exclude - array of busy LUNs
+ * Returns : Scsi_Cmnd if successful (and a reference), or NULL if no command available
+ */
+extern Scsi_Cmnd *queue_remove_exclude (Queue_t *queue, unsigned long *exclude);
+
+#define queue_add_cmd_ordered(queue,SCpnt) \
+ __queue_add(queue,SCpnt,(SCpnt)->cmnd[0] == REQUEST_SENSE)
+#define queue_add_cmd_tail(queue,SCpnt) \
+ __queue_add(queue,SCpnt,0)
+/*
+ * Function: int __queue_add(Queue_t *queue, Scsi_Cmnd *SCpnt, int head)
+ * Purpose : Add a new command onto a queue
+ * Params : queue - destination queue
+ * SCpnt - command to add
+ * head - add command to head of queue
+ * Returns : 0 on error, !0 on success
+ */
+extern int __queue_add(Queue_t *queue, Scsi_Cmnd *SCpnt, int head);
+
+/*
+ * Function: Scsi_Cmnd *queue_remove_tgtluntag (queue, target, lun, tag)
+ * Purpose : remove a SCSI command from the queue for a specified target/lun/tag
+ * Params : queue - queue to remove command from
+ * target - target that we want
+ * lun - lun on device
+ * tag - tag on device
+ * Returns : Scsi_Cmnd if successful, or NULL if no command satisfies requirements
+ */
+extern Scsi_Cmnd *queue_remove_tgtluntag (Queue_t *queue, int target, int lun, int tag);
+
+/*
+ * Function: queue_remove_all_target(queue, target)
+ * Purpose : remove all SCSI commands from the queue for a specified target
+ * Params : queue - queue to remove command from
+ * target - target device id
+ * Returns : nothing
+ */
+extern void queue_remove_all_target(Queue_t *queue, int target);
+
+/*
+ * Function: int queue_probetgtlun (queue, target, lun)
+ * Purpose : check to see if we have a command in the queue for the specified
+ * target/lun.
+ * Params : queue - queue to look in
+ * target - target we want to probe
+ * lun - lun on target
+ * Returns : 0 if not found, != 0 if found
+ */
+extern int queue_probetgtlun (Queue_t *queue, int target, int lun);
+
+/*
+ * Function: int queue_remove_cmd (Queue_t *queue, Scsi_Cmnd *SCpnt)
+ * Purpose : remove a specific command from the queues
+ * Params : queue - queue to look in
+ * SCpnt - command to find
+ * Returns : 0 if not found
+ */
+int queue_remove_cmd(Queue_t *queue, Scsi_Cmnd *SCpnt);
+
+#endif /* QUEUE_H */