Merge tag 'trace-v6.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/trace...
[linux-block.git] / drivers / scsi / arm / queue.h
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d2912cb1 1/* SPDX-License-Identifier: GPL-2.0-only */
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2/*
3 * linux/drivers/acorn/scsi/queue.h: queue handling
4 *
5 * Copyright (C) 1997 Russell King
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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/*
ee0ca6ba 32 * Function: struct scsi_cmnd *queue_remove (queue)
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33 * Purpose : removes first SCSI command from a queue
34 * Params : queue - queue to remove command from
ee0ca6ba 35 * Returns : struct scsi_cmnd if successful (and a reference), or NULL if no command available
1da177e4 36 */
ee0ca6ba 37extern struct scsi_cmnd *queue_remove (Queue_t *queue);
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38
39/*
ee0ca6ba 40 * Function: struct scsi_cmnd *queue_remove_exclude_ref (queue, exclude)
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41 * Purpose : remove a SCSI command from a queue
42 * Params : queue - queue to remove command from
43 * exclude - array of busy LUNs
ee0ca6ba 44 * Returns : struct scsi_cmnd if successful (and a reference), or NULL if no command available
1da177e4 45 */
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H
46extern struct scsi_cmnd *queue_remove_exclude(Queue_t *queue,
47 unsigned long *exclude);
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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/*
ee0ca6ba 54 * Function: int __queue_add(Queue_t *queue, struct scsi_cmnd *SCpnt, int head)
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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 */
ee0ca6ba 61extern int __queue_add(Queue_t *queue, struct scsi_cmnd *SCpnt, int head);
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62
63/*
ee0ca6ba 64 * Function: struct scsi_cmnd *queue_remove_tgtluntag (queue, target, lun, tag)
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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
ee0ca6ba 70 * Returns : struct scsi_cmnd if successful, or NULL if no command satisfies requirements
1da177e4 71 */
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72extern struct scsi_cmnd *queue_remove_tgtluntag(Queue_t *queue, int target,
73 int lun, int tag);
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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/*
ee0ca6ba 96 * Function: int queue_remove_cmd (Queue_t *queue, struct scsi_cmnd *SCpnt)
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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 */
ee0ca6ba 102int queue_remove_cmd(Queue_t *queue, struct scsi_cmnd *SCpnt);
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103
104#endif /* QUEUE_H */