| /* SPDX-License-Identifier: GPL-2.0-only */ | |
| /* | |
| * linux/drivers/acorn/scsi/queue.h: queue handling | |
| * | |
| * Copyright (C) 1997 Russell King | |
| */ | |
| #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 */ |