3  *  linux/drivers/acorn/scsi/queue.c: queue handling primitives
46 #include "queue.h"
51  * Function: void queue_initialise (Queue_t *queue)
52  * Purpose : initialise a queue
53  * Params  : queue - queue to initialise
55 int queue_initialise (Queue_t *queue)  in queue_initialise()  argument
60 	spin_lock_init(&queue->queue_lock);  in queue_initialise()
61 	INIT_LIST_HEAD(&queue->head);  in queue_initialise()
62 	INIT_LIST_HEAD(&queue->free);  in queue_initialise()
70 	queue->alloc = q = kmalloc_array(nqueues, sizeof(QE_t), GFP_KERNEL);  in queue_initialise()
75 			list_add(&q->list, &queue->free);  in queue_initialise()
79 	return queue->alloc != NULL;  in queue_initialise()
83  * Function: void queue_free (Queue_t *queue)
84  * Purpose : free a queue
85  * Params  : queue - queue to free
87 void queue_free (Queue_t *queue)  in queue_free()  argument
89 	if (!list_empty(&queue->head))  in queue_free()
90 		printk(KERN_WARNING "freeing non-empty queue %p\n", queue);  in queue_free()
91 	kfree(queue->alloc);  in queue_free()
96  * Function: int __queue_add(Queue_t *queue, struct scsi_cmnd *SCpnt, int head)
97  * Purpose : Add a new command onto a queue, adding REQUEST_SENSE to head.
98  * Params  : queue - destination queue
100  *	     head  - add command to head of queue
103 int __queue_add(Queue_t *queue, struct scsi_cmnd *SCpnt, int head)  in __queue_add()  argument
110 	spin_lock_irqsave(&queue->queue_lock, flags);  in __queue_add()
111 	if (list_empty(&queue->free))  in __queue_add()
114 	l = queue->free.next;  in __queue_add()
124 		list_add(l, &queue->head);  in __queue_add()
126 		list_add_tail(l, &queue->head);  in __queue_add()
130 	spin_unlock_irqrestore(&queue->queue_lock, flags);  in __queue_add()
134 static struct scsi_cmnd *__queue_remove(Queue_t *queue, struct list_head *ent)  in __queue_remove()  argument
146 	list_add(ent, &queue->free);  in __queue_remove()
152  * Function: struct scsi_cmnd *queue_remove_exclude (queue, exclude)
153  * Purpose : remove a SCSI command from a queue
154  * Params  : queue   - queue to remove command from
158 struct scsi_cmnd *queue_remove_exclude(Queue_t *queue, unsigned long *exclude)  in queue_remove_exclude()  argument
164 	spin_lock_irqsave(&queue->queue_lock, flags);  in queue_remove_exclude()
165 	list_for_each(l, &queue->head) {  in queue_remove_exclude()
169 			SCpnt = __queue_remove(queue, l);  in queue_remove_exclude()
173 	spin_unlock_irqrestore(&queue->queue_lock, flags);  in queue_remove_exclude()
179  * Function: struct scsi_cmnd *queue_remove (queue)
180  * Purpose : removes first SCSI command from a queue
181  * Params  : queue   - queue to remove command from
184 struct scsi_cmnd *queue_remove(Queue_t *queue)  in queue_remove()  argument
189 	spin_lock_irqsave(&queue->queue_lock, flags);  in queue_remove()
190 	if (!list_empty(&queue->head))  in queue_remove()
191 		SCpnt = __queue_remove(queue, queue->head.next);  in queue_remove()
192 	spin_unlock_irqrestore(&queue->queue_lock, flags);  in queue_remove()
198  * Function: struct scsi_cmnd *queue_remove_tgtluntag (queue, target, lun, tag)
199  * Purpose : remove a SCSI command from the queue for a specified target/lun/tag
200  * Params  : queue  - queue to remove command from
206 struct scsi_cmnd *queue_remove_tgtluntag(Queue_t *queue, int target, int lun,  in queue_remove_tgtluntag()  argument
213 	spin_lock_irqsave(&queue->queue_lock, flags);  in queue_remove_tgtluntag()
214 	list_for_each(l, &queue->head) {  in queue_remove_tgtluntag()
218 			SCpnt = __queue_remove(queue, l);  in queue_remove_tgtluntag()
222 	spin_unlock_irqrestore(&queue->queue_lock, flags);  in queue_remove_tgtluntag()
228  * Function: queue_remove_all_target(queue, target)
229  * Purpose : remove all SCSI commands from the queue for a specified target
230  * Params  : queue  - queue to remove command from
234 void queue_remove_all_target(Queue_t *queue, int target)  in queue_remove_all_target()  argument
239 	spin_lock_irqsave(&queue->queue_lock, flags);  in queue_remove_all_target()
240 	list_for_each(l, &queue->head) {  in queue_remove_all_target()
243 			__queue_remove(queue, l);  in queue_remove_all_target()
245 	spin_unlock_irqrestore(&queue->queue_lock, flags);  in queue_remove_all_target()
249  * Function: int queue_probetgtlun (queue, target, lun)
250  * Purpose : check to see if we have a command in the queue for the specified
252  * Params  : queue  - queue to look in
257 int queue_probetgtlun (Queue_t *queue, int target, int lun)  in queue_probetgtlun()  argument
263 	spin_lock_irqsave(&queue->queue_lock, flags);  in queue_probetgtlun()
264 	list_for_each(l, &queue->head) {  in queue_probetgtlun()
271 	spin_unlock_irqrestore(&queue->queue_lock, flags);  in queue_probetgtlun()
277  * Function: int queue_remove_cmd(Queue_t *queue, struct scsi_cmnd *SCpnt)
279  * Params  : queue - queue to look in
283 int queue_remove_cmd(Queue_t *queue, struct scsi_cmnd *SCpnt)  in queue_remove_cmd()  argument
289 	spin_lock_irqsave(&queue->queue_lock, flags);  in queue_remove_cmd()
290 	list_for_each(l, &queue->head) {  in queue_remove_cmd()
293 			__queue_remove(queue, l);  in queue_remove_cmd()
298 	spin_unlock_irqrestore(&queue->queue_lock, flags);  in queue_remove_cmd()