/* locks: must only be called with zfcp_data.config_sema taken */
int
zfcp_qdio_allocate_queues(struct zfcp_adapter *adapter)
{
int buffer_count;
int retval = 0;
buffer_count =
zfcp_qdio_buffers_enqueue(&(adapter->request_queue.buffer[0]),
QDIO_MAX_BUFFERS_PER_Q);
if (buffer_count < QDIO_MAX_BUFFERS_PER_Q) {
ZFCP_LOG_DEBUG("only %d QDIO buffers allocated for request "
"queue\n", buffer_count);
zfcp_qdio_buffers_dequeue(&(adapter->request_queue.buffer[0]),
buffer_count);
retval = -ENOMEM;
goto out;
}
buffer_count =
zfcp_qdio_buffers_enqueue(&(adapter->response_queue.buffer[0]),
QDIO_MAX_BUFFERS_PER_Q);
if (buffer_count < QDIO_MAX_BUFFERS_PER_Q) {
ZFCP_LOG_DEBUG("only %d QDIO buffers allocated for response "
"queue", buffer_count);
zfcp_qdio_buffers_dequeue(&(adapter->response_queue.buffer[0]),
buffer_count);
ZFCP_LOG_TRACE("freeing request_queue buffers\n");
zfcp_qdio_buffers_dequeue(&(adapter->request_queue.buffer[0]),
QDIO_MAX_BUFFERS_PER_Q);
retval = -ENOMEM;
goto out;
}
out:
return retval;
}
/* locks: must only be called with zfcp_data.config_sema taken */
void
zfcp_qdio_free_queues(struct zfcp_adapter *adapter)
{
ZFCP_LOG_TRACE("freeing request_queue buffers\n");
zfcp_qdio_buffers_dequeue(adapter->request_queue.buffer);
ZFCP_LOG_TRACE("freeing response_queue buffers\n");
zfcp_qdio_buffers_dequeue(adapter->response_queue.buffer);
}
/* locks: must only be called with zfcp_data.config_sema taken */
void
zfcp_qdio_free_queues(struct zfcp_adapter *adapter)
{
ZFCP_LOG_TRACE("freeing request_queue buffers\n");
zfcp_qdio_buffers_dequeue(&(adapter->request_queue.buffer[0]),
QDIO_MAX_BUFFERS_PER_Q);
ZFCP_LOG_TRACE("freeing response_queue buffers\n");
zfcp_qdio_buffers_dequeue(&(adapter->response_queue.buffer[0]),
QDIO_MAX_BUFFERS_PER_Q);
}
/*
* Allocates BUFFER memory to each of the pointers of the qdio_buffer_t
* array in the adapter struct.
* Cur_buf is the pointer array
*
* returns: zero on success else -ENOMEM
* locks: must only be called with zfcp_data.config_sema taken
*/
static int
zfcp_qdio_buffers_enqueue(struct qdio_buffer **sbuf)
{
int pos;
for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos += QBUFF_PER_PAGE) {
sbuf[pos] = (struct qdio_buffer *) get_zeroed_page(GFP_KERNEL);
if (!sbuf[pos]) {
zfcp_qdio_buffers_dequeue(sbuf);
return -ENOMEM;
}
}
for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos++)
if (pos % QBUFF_PER_PAGE)
sbuf[pos] = sbuf[pos - 1] + 1;
return 0;
}