summaryrefslogtreecommitdiff
path: root/drivers/scsi/arm/queue.h
diff options
context:
space:
mode:
authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/scsi/arm/queue.h
Initial import
Diffstat (limited to 'drivers/scsi/arm/queue.h')
-rw-r--r--drivers/scsi/arm/queue.h107
1 files changed, 107 insertions, 0 deletions
diff --git a/drivers/scsi/arm/queue.h b/drivers/scsi/arm/queue.h
new file mode 100644
index 000000000..3c519c923
--- /dev/null
+++ b/drivers/scsi/arm/queue.h
@@ -0,0 +1,107 @@
+/*
+ * 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: struct scsi_cmnd *queue_remove (queue)
+ * Purpose : removes first SCSI command from a queue
+ * Params : queue - queue to remove command from
+ * Returns : struct scsi_cmnd if successful (and a reference), or NULL if no command available
+ */
+extern struct scsi_cmnd *queue_remove (Queue_t *queue);
+
+/*
+ * Function: struct 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 : struct scsi_cmnd if successful (and a reference), or NULL if no command available
+ */
+extern struct 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, struct 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, struct scsi_cmnd *SCpnt, int head);
+
+/*
+ * Function: struct 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 : struct scsi_cmnd if successful, or NULL if no command satisfies requirements
+ */
+extern struct 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, struct 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, struct scsi_cmnd *SCpnt);
+
+#endif /* QUEUE_H */