drivers/s390/scsi/zfcp_aux.c

Source file repositories/reference/linux-study-clean/drivers/s390/scsi/zfcp_aux.c

File Facts

System
Linux kernel
Corpus path
drivers/s390/scsi/zfcp_aux.c
Extension
.c
Size
14865 bytes
Lines
568
Domain
Driver Families
Bucket
drivers/s390
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

module_init(zfcp_module_init);

static void __exit zfcp_module_exit(void)
{
	ccw_driver_unregister(&zfcp_ccw_driver);
	fc_release_transport(zfcp_scsi_transport_template);
	kmem_cache_destroy(zfcp_fc_req_cache);
	kmem_cache_destroy(zfcp_fsf_qtcb_cache);
}

module_exit(zfcp_module_exit);

/**
 * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
 * @adapter: pointer to adapter to search for port
 * @wwpn: wwpn to search for
 *
 * Returns: pointer to zfcp_port or NULL
 */
struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter,
					u64 wwpn)
{
	unsigned long flags;
	struct zfcp_port *port;

	read_lock_irqsave(&adapter->port_list_lock, flags);
	list_for_each_entry(port, &adapter->port_list, list)
		if (port->wwpn == wwpn) {
			if (!get_device(&port->dev))
				port = NULL;
			read_unlock_irqrestore(&adapter->port_list_lock, flags);
			return port;
		}
	read_unlock_irqrestore(&adapter->port_list_lock, flags);
	return NULL;
}

static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
{
	adapter->pool.erp_req =
		mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
	if (!adapter->pool.erp_req)
		return -ENOMEM;

	adapter->pool.gid_pn_req =
		mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
	if (!adapter->pool.gid_pn_req)
		return -ENOMEM;

	adapter->pool.scsi_req =
		mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
	if (!adapter->pool.scsi_req)
		return -ENOMEM;

	adapter->pool.scsi_abort =
		mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
	if (!adapter->pool.scsi_abort)
		return -ENOMEM;

	adapter->pool.status_read_req =
		mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM,
					    sizeof(struct zfcp_fsf_req));
	if (!adapter->pool.status_read_req)
		return -ENOMEM;

	adapter->pool.qtcb_pool =
		mempool_create_slab_pool(4, zfcp_fsf_qtcb_cache);
	if (!adapter->pool.qtcb_pool)
		return -ENOMEM;

	BUILD_BUG_ON(sizeof(struct fsf_status_read_buffer) > PAGE_SIZE);
	adapter->pool.sr_data =
		mempool_create_page_pool(FSF_STATUS_READS_RECOM, 0);
	if (!adapter->pool.sr_data)
		return -ENOMEM;

	adapter->pool.gid_pn =
		mempool_create_slab_pool(1, zfcp_fc_req_cache);
	if (!adapter->pool.gid_pn)
		return -ENOMEM;

	return 0;
}

static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
{
	mempool_destroy(adapter->pool.erp_req);
	mempool_destroy(adapter->pool.scsi_req);
	mempool_destroy(adapter->pool.scsi_abort);
	mempool_destroy(adapter->pool.qtcb_pool);

Annotation

Implementation Notes