2  *  linux/drivers/acorn/scsi/queue.c: queue handling primitives
49 #include "queue.h"
54  * Function: void queue_initialise (Queue_t *queue)
55  * Purpose : initialise a queue
56  * Params  : queue - queue to initialise
58 int queue_initialise (Queue_t *queue)  in queue_initialise()  argument
63 	spin_lock_init(&queue->queue_lock);  in queue_initialise()
64 	INIT_LIST_HEAD(&queue->head);  in queue_initialise()
65 	INIT_LIST_HEAD(&queue->free);  in queue_initialise()
73 	queue->alloc = q = kmalloc_array(nqueues, sizeof(QE_t), GFP_KERNEL);  in queue_initialise()
78 			list_add(&q->list, &queue->free);  in queue_initialise()
82 	return queue->alloc != NULL;  in queue_initialise()
86  * Function: void queue_free (Queue_t *queue)
87  * Purpose : free a queue
88  * Params  : queue - queue to free
90 void queue_free (Queue_t *queue)  in queue_free()  argument
92 	if (!list_empty(&queue->head))  in queue_free()
93 		printk(KERN_WARNING "freeing non-empty queue %p\n", queue);  in queue_free()
94 	kfree(queue->alloc);  in queue_free()
99  * Function: int __queue_add(Queue_t *queue, struct scsi_cmnd *SCpnt, int head)
100  * Purpose : Add a new command onto a queue, adding REQUEST_SENSE to head.
101  * Params  : queue - destination queue
103  *	     head  - add command to head of queue
106 int __queue_add(Queue_t *queue, struct scsi_cmnd *SCpnt, int head)  in __queue_add()  argument
113 	spin_lock_irqsave(&queue->queue_lock, flags);  in __queue_add()
114 	if (list_empty(&queue->free))  in __queue_add()
117 	l = queue->free.next;  in __queue_add()
127 		list_add(l, &queue->head);  in __queue_add()
129 		list_add_tail(l, &queue->head);  in __queue_add()
133 	spin_unlock_irqrestore(&queue->queue_lock, flags);  in __queue_add()
137 static struct scsi_cmnd *__queue_remove(Queue_t *queue, struct list_head *ent)  in __queue_remove()  argument
149 	list_add(ent, &queue->free);  in __queue_remove()
155  * Function: struct scsi_cmnd *queue_remove_exclude (queue, exclude)
156  * Purpose : remove a SCSI command from a queue
157  * Params  : queue   - queue to remove command from
161 struct scsi_cmnd *queue_remove_exclude(Queue_t *queue, unsigned long *exclude)  in queue_remove_exclude()  argument
167 	spin_lock_irqsave(&queue->queue_lock, flags);  in queue_remove_exclude()
168 	list_for_each(l, &queue->head) {  in queue_remove_exclude()
172 			SCpnt = __queue_remove(queue, l);  in queue_remove_exclude()
176 	spin_unlock_irqrestore(&queue->queue_lock, flags);  in queue_remove_exclude()
182  * Function: struct scsi_cmnd *queue_remove (queue)
183  * Purpose : removes first SCSI command from a queue
184  * Params  : queue   - queue to remove command from
187 struct scsi_cmnd *queue_remove(Queue_t *queue)  in queue_remove()  argument
192 	spin_lock_irqsave(&queue->queue_lock, flags);  in queue_remove()
193 	if (!list_empty(&queue->head))  in queue_remove()
194 		SCpnt = __queue_remove(queue, queue->head.next);  in queue_remove()
195 	spin_unlock_irqrestore(&queue->queue_lock, flags);  in queue_remove()
201  * Function: struct scsi_cmnd *queue_remove_tgtluntag (queue, target, lun, tag)
202  * Purpose : remove a SCSI command from the queue for a specified target/lun/tag
203  * Params  : queue  - queue to remove command from
209 struct scsi_cmnd *queue_remove_tgtluntag(Queue_t *queue, int target, int lun,  in queue_remove_tgtluntag()  argument
216 	spin_lock_irqsave(&queue->queue_lock, flags);  in queue_remove_tgtluntag()
217 	list_for_each(l, &queue->head) {  in queue_remove_tgtluntag()
221 			SCpnt = __queue_remove(queue, l);  in queue_remove_tgtluntag()
225 	spin_unlock_irqrestore(&queue->queue_lock, flags);  in queue_remove_tgtluntag()
231  * Function: queue_remove_all_target(queue, target)
232  * Purpose : remove all SCSI commands from the queue for a specified target
233  * Params  : queue  - queue to remove command from
237 void queue_remove_all_target(Queue_t *queue, int target)  in queue_remove_all_target()  argument
242 	spin_lock_irqsave(&queue->queue_lock, flags);  in queue_remove_all_target()
243 	list_for_each(l, &queue->head) {  in queue_remove_all_target()
246 			__queue_remove(queue, l);  in queue_remove_all_target()
248 	spin_unlock_irqrestore(&queue->queue_lock, flags);  in queue_remove_all_target()
252  * Function: int queue_probetgtlun (queue, target, lun)
253  * Purpose : check to see if we have a command in the queue for the specified
255  * Params  : queue  - queue to look in
260 int queue_probetgtlun (Queue_t *queue, int target, int lun)  in queue_probetgtlun()  argument
266 	spin_lock_irqsave(&queue->queue_lock, flags);  in queue_probetgtlun()
267 	list_for_each(l, &queue->head) {  in queue_probetgtlun()
274 	spin_unlock_irqrestore(&queue->queue_lock, flags);  in queue_probetgtlun()
280  * Function: int queue_remove_cmd(Queue_t *queue, struct scsi_cmnd *SCpnt)
282  * Params  : queue - queue to look in
286 int queue_remove_cmd(Queue_t *queue, struct scsi_cmnd *SCpnt)  in queue_remove_cmd()  argument
292 	spin_lock_irqsave(&queue->queue_lock, flags);  in queue_remove_cmd()
293 	list_for_each(l, &queue->head) {  in queue_remove_cmd()
296 			__queue_remove(queue, l);  in queue_remove_cmd()
301 	spin_unlock_irqrestore(&queue->queue_lock, flags);  in queue_remove_cmd()