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/drivers/scsi/arm/queue.h

http://github.com/mirrors/linux
C Header | 104 lines | 24 code | 11 blank | 69 comment | 1 complexity | a0ca35cafb8084b7221374af39b33755 MD5 | raw file
  1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 *  linux/drivers/acorn/scsi/queue.h: queue handling
  4 *
  5 *  Copyright (C) 1997 Russell King
  6 */
  7#ifndef QUEUE_H
  8#define QUEUE_H
  9
 10typedef struct {
 11	struct list_head head;
 12	struct list_head free;
 13	spinlock_t queue_lock;
 14	void *alloc;			/* start of allocated mem */
 15} Queue_t;
 16
 17/*
 18 * Function: void queue_initialise (Queue_t *queue)
 19 * Purpose : initialise a queue
 20 * Params  : queue - queue to initialise
 21 */
 22extern int queue_initialise (Queue_t *queue);
 23
 24/*
 25 * Function: void queue_free (Queue_t *queue)
 26 * Purpose : free a queue
 27 * Params  : queue - queue to free
 28 */
 29extern void queue_free (Queue_t *queue);
 30
 31/*
 32 * Function: struct scsi_cmnd *queue_remove (queue)
 33 * Purpose : removes first SCSI command from a queue
 34 * Params  : queue   - queue to remove command from
 35 * Returns : struct scsi_cmnd if successful (and a reference), or NULL if no command available
 36 */
 37extern struct scsi_cmnd *queue_remove (Queue_t *queue);
 38
 39/*
 40 * Function: struct scsi_cmnd *queue_remove_exclude_ref (queue, exclude)
 41 * Purpose : remove a SCSI command from a queue
 42 * Params  : queue   - queue to remove command from
 43 *	     exclude - array of busy LUNs
 44 * Returns : struct scsi_cmnd if successful (and a reference), or NULL if no command available
 45 */
 46extern struct scsi_cmnd *queue_remove_exclude(Queue_t *queue,
 47					      unsigned long *exclude);
 48
 49#define queue_add_cmd_ordered(queue,SCpnt) \
 50	__queue_add(queue,SCpnt,(SCpnt)->cmnd[0] == REQUEST_SENSE)
 51#define queue_add_cmd_tail(queue,SCpnt) \
 52	__queue_add(queue,SCpnt,0)
 53/*
 54 * Function: int __queue_add(Queue_t *queue, struct scsi_cmnd *SCpnt, int head)
 55 * Purpose : Add a new command onto a queue
 56 * Params  : queue - destination queue
 57 *	     SCpnt - command to add
 58 *	     head  - add command to head of queue
 59 * Returns : 0 on error, !0 on success
 60 */
 61extern int __queue_add(Queue_t *queue, struct scsi_cmnd *SCpnt, int head);
 62
 63/*
 64 * Function: struct scsi_cmnd *queue_remove_tgtluntag (queue, target, lun, tag)
 65 * Purpose : remove a SCSI command from the queue for a specified target/lun/tag
 66 * Params  : queue  - queue to remove command from
 67 *	     target - target that we want
 68 *	     lun    - lun on device
 69 *	     tag    - tag on device
 70 * Returns : struct scsi_cmnd if successful, or NULL if no command satisfies requirements
 71 */
 72extern struct scsi_cmnd *queue_remove_tgtluntag(Queue_t *queue, int target,
 73						int lun, int tag);
 74
 75/*
 76 * Function: queue_remove_all_target(queue, target)
 77 * Purpose : remove all SCSI commands from the queue for a specified target
 78 * Params  : queue  - queue to remove command from
 79 *           target - target device id
 80 * Returns : nothing
 81 */
 82extern void queue_remove_all_target(Queue_t *queue, int target);
 83
 84/*
 85 * Function: int queue_probetgtlun (queue, target, lun)
 86 * Purpose : check to see if we have a command in the queue for the specified
 87 *	     target/lun.
 88 * Params  : queue  - queue to look in
 89 *	     target - target we want to probe
 90 *	     lun    - lun on target
 91 * Returns : 0 if not found, != 0 if found
 92 */
 93extern int queue_probetgtlun (Queue_t *queue, int target, int lun);
 94
 95/*
 96 * Function: int queue_remove_cmd (Queue_t *queue, struct scsi_cmnd *SCpnt)
 97 * Purpose : remove a specific command from the queues
 98 * Params  : queue - queue to look in
 99 *	     SCpnt - command to find
100 * Returns : 0 if not found
101 */
102int queue_remove_cmd(Queue_t *queue, struct scsi_cmnd *SCpnt);
103
104#endif /* QUEUE_H */