scsi/ibmvscsi/ibmvscsi.c

113  * Routines for managing the command/response queue
134  * @queue:		crq_queue to initialize and register
141 static void ibmvscsi_release_crq_queue(struct crq_queue *queue,
155 			 queue->msg_token,
156 			 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
157 	free_page((unsigned long)queue->msgs);
161  * crq_queue_next_crq: - Returns the next entry in message queue
162  * @queue:	crq_queue to use
164  * Returns pointer to next entry in queue, or NULL if there are no new
167 static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue)
172 	spin_lock_irqsave(&queue->lock, flags);
173 	crq = &queue->msgs[queue->cur];
175 		if (++queue->cur == queue->size)
176 			queue->cur = 0;
184 	spin_unlock_irqrestore(&queue->lock, flags);
221 		while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) {
228 		crq = crq_queue_next_crq(&hostdata->queue);
281  * @queue:	crq_queue to initialize and register
284 static int ibmvscsi_reset_crq_queue(struct crq_queue *queue,
297 	/* Clean out the queue */
298 	memset(queue->msgs, 0x00, PAGE_SIZE);
299 	queue->cur = 0;
306 				queue->msg_token, PAGE_SIZE);
318  * @queue:		crq_queue to initialize and register
326 static int ibmvscsi_init_crq_queue(struct crq_queue *queue,
334 	queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL);
336 	if (!queue->msgs)
338 	queue->size = PAGE_SIZE / sizeof(*queue->msgs);
340 	queue->msg_token = dma_map_single(hostdata->dev, queue->msgs,
341 					  queue->size * sizeof(*queue->msgs),
344 	if (dma_mapping_error(hostdata->dev, queue->msg_token))
352 				queue->msg_token, PAGE_SIZE);
355 		rc = ibmvscsi_reset_crq_queue(queue,
367 	queue->cur = 0;
368 	spin_lock_init(&queue->lock);
399 			 queue->msg_token,
400 			 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
402 	free_page((unsigned long)queue->msgs);
409  * @queue:	crq_queue to initialize and register
412 static int ibmvscsi_reenable_crq_queue(struct crq_queue *queue,
956 			         "Receive queue closed, will retry.\n");
1762  * @crq:	Command/Response queue
1885  * ibmvscsi_change_queue_depth - Change the device's queue depth
2137 		rc = ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata);
2146 		rc = ibmvscsi_reenable_crq_queue(&hostdata->queue, hostdata);
2264 	rc = ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, max_events);
2329 	ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_events);
2350 	ibmvscsi_release_crq_queue(&hostdata->queue, hostdata,