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104 lines
3.4 KiB
104 lines
3.4 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* linux/drivers/acorn/scsi/queue.h: queue handling |
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* |
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* Copyright (C) 1997 Russell King |
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*/ |
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#ifndef QUEUE_H |
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#define QUEUE_H |
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typedef struct { |
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struct list_head head; |
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struct list_head free; |
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spinlock_t queue_lock; |
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void *alloc; /* start of allocated mem */ |
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} Queue_t; |
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/* |
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* Function: void queue_initialise (Queue_t *queue) |
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* Purpose : initialise a queue |
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* Params : queue - queue to initialise |
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*/ |
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extern int queue_initialise (Queue_t *queue); |
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/* |
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* Function: void queue_free (Queue_t *queue) |
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* Purpose : free a queue |
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* Params : queue - queue to free |
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*/ |
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extern void queue_free (Queue_t *queue); |
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/* |
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* Function: struct scsi_cmnd *queue_remove (queue) |
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* Purpose : removes first SCSI command from a queue |
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* Params : queue - queue to remove command from |
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* Returns : struct scsi_cmnd if successful (and a reference), or NULL if no command available |
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*/ |
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extern struct scsi_cmnd *queue_remove (Queue_t *queue); |
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/* |
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* Function: struct scsi_cmnd *queue_remove_exclude_ref (queue, exclude) |
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* Purpose : remove a SCSI command from a queue |
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* Params : queue - queue to remove command from |
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* exclude - array of busy LUNs |
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* Returns : struct scsi_cmnd if successful (and a reference), or NULL if no command available |
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*/ |
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extern struct scsi_cmnd *queue_remove_exclude(Queue_t *queue, |
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unsigned long *exclude); |
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#define queue_add_cmd_ordered(queue,SCpnt) \ |
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__queue_add(queue,SCpnt,(SCpnt)->cmnd[0] == REQUEST_SENSE) |
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#define queue_add_cmd_tail(queue,SCpnt) \ |
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__queue_add(queue,SCpnt,0) |
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/* |
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* Function: int __queue_add(Queue_t *queue, struct scsi_cmnd *SCpnt, int head) |
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* Purpose : Add a new command onto a queue |
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* Params : queue - destination queue |
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* SCpnt - command to add |
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* head - add command to head of queue |
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* Returns : 0 on error, !0 on success |
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*/ |
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extern int __queue_add(Queue_t *queue, struct scsi_cmnd *SCpnt, int head); |
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/* |
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* Function: struct scsi_cmnd *queue_remove_tgtluntag (queue, target, lun, tag) |
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* Purpose : remove a SCSI command from the queue for a specified target/lun/tag |
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* Params : queue - queue to remove command from |
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* target - target that we want |
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* lun - lun on device |
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* tag - tag on device |
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* Returns : struct scsi_cmnd if successful, or NULL if no command satisfies requirements |
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*/ |
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extern struct scsi_cmnd *queue_remove_tgtluntag(Queue_t *queue, int target, |
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int lun, int tag); |
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/* |
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* Function: queue_remove_all_target(queue, target) |
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* Purpose : remove all SCSI commands from the queue for a specified target |
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* Params : queue - queue to remove command from |
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* target - target device id |
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* Returns : nothing |
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*/ |
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extern void queue_remove_all_target(Queue_t *queue, int target); |
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/* |
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* Function: int queue_probetgtlun (queue, target, lun) |
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* Purpose : check to see if we have a command in the queue for the specified |
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* target/lun. |
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* Params : queue - queue to look in |
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* target - target we want to probe |
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* lun - lun on target |
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* Returns : 0 if not found, != 0 if found |
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*/ |
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extern int queue_probetgtlun (Queue_t *queue, int target, int lun); |
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/* |
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* Function: int queue_remove_cmd (Queue_t *queue, struct scsi_cmnd *SCpnt) |
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* Purpose : remove a specific command from the queues |
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* Params : queue - queue to look in |
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* SCpnt - command to find |
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* Returns : 0 if not found |
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*/ |
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int queue_remove_cmd(Queue_t *queue, struct scsi_cmnd *SCpnt); |
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#endif /* QUEUE_H */
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