70 	struct agp_bridge_data *bridge;  in agp_backend_acquire()  local
72 	bridge = agp_find_bridge(pdev);  in agp_backend_acquire()
74 	if (!bridge)  in agp_backend_acquire()
77 	if (atomic_read(&bridge->agp_in_use))  in agp_backend_acquire()
79 	atomic_inc(&bridge->agp_in_use);  in agp_backend_acquire()
80 	return bridge;  in agp_backend_acquire()
87  *	@bridge: the AGP backend to release
94 void agp_backend_release(struct agp_bridge_data *bridge)  in agp_backend_release()  argument
97 	if (bridge)  in agp_backend_release()
98 		atomic_dec(&bridge->agp_in_use);  in agp_backend_release()
139 static int agp_backend_initialize(struct agp_bridge_data *bridge)  in agp_backend_initialize()  argument
143 	bridge->max_memory_agp = agp_find_max();  in agp_backend_initialize()
144 	bridge->version = &agp_current_version;  in agp_backend_initialize()
146 	if (bridge->driver->needs_scratch_page) {  in agp_backend_initialize()
147 		struct page *page = bridge->driver->agp_alloc_page(bridge);  in agp_backend_initialize()
150 			dev_err(&bridge->dev->dev,  in agp_backend_initialize()
155 		bridge->scratch_page_page = page;  in agp_backend_initialize()
156 		bridge->scratch_page_dma = page_to_phys(page);  in agp_backend_initialize()
158 		bridge->scratch_page = bridge->driver->mask_memory(bridge,  in agp_backend_initialize()
159 						   bridge->scratch_page_dma, 0);  in agp_backend_initialize()
162 	size_value = bridge->driver->fetch_size();  in agp_backend_initialize()
164 		dev_err(&bridge->dev->dev, "can't determine aperture size\n");  in agp_backend_initialize()
168 	if (bridge->driver->create_gatt_table(bridge)) {  in agp_backend_initialize()
169 		dev_err(&bridge->dev->dev,  in agp_backend_initialize()
176 	bridge->key_list = vzalloc(PAGE_SIZE * 4);  in agp_backend_initialize()
177 	if (bridge->key_list == NULL) {  in agp_backend_initialize()
178 		dev_err(&bridge->dev->dev,  in agp_backend_initialize()
187 	if (bridge->driver->configure()) {  in agp_backend_initialize()
188 		dev_err(&bridge->dev->dev, "error configuring host chipset\n");  in agp_backend_initialize()
192 	INIT_LIST_HEAD(&bridge->mapped_list);  in agp_backend_initialize()
193 	spin_lock_init(&bridge->mapped_lock);  in agp_backend_initialize()
198 	if (bridge->driver->needs_scratch_page) {  in agp_backend_initialize()
199 		struct page *page = bridge->scratch_page_page;  in agp_backend_initialize()
201 		bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_UNMAP);  in agp_backend_initialize()
202 		bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_FREE);  in agp_backend_initialize()
205 		bridge->driver->free_gatt_table(bridge);  in agp_backend_initialize()
207 		vfree(bridge->key_list);  in agp_backend_initialize()
208 		bridge->key_list = NULL;  in agp_backend_initialize()
214 static void agp_backend_cleanup(struct agp_bridge_data *bridge)  in agp_backend_cleanup()  argument
216 	if (bridge->driver->cleanup)  in agp_backend_cleanup()
217 		bridge->driver->cleanup();  in agp_backend_cleanup()
218 	if (bridge->driver->free_gatt_table)  in agp_backend_cleanup()
219 		bridge->driver->free_gatt_table(bridge);  in agp_backend_cleanup()
221 	vfree(bridge->key_list);  in agp_backend_cleanup()
222 	bridge->key_list = NULL;  in agp_backend_cleanup()
224 	if (bridge->driver->agp_destroy_page &&  in agp_backend_cleanup()
225 	    bridge->driver->needs_scratch_page) {  in agp_backend_cleanup()
226 		struct page *page = bridge->scratch_page_page;  in agp_backend_cleanup()
228 		bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_UNMAP);  in agp_backend_cleanup()
229 		bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_FREE);  in agp_backend_cleanup()
239 	struct agp_bridge_data *bridge;  in agp_alloc_bridge()  local
241 	bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);  in agp_alloc_bridge()
242 	if (!bridge)  in agp_alloc_bridge()
245 	atomic_set(&bridge->agp_in_use, 0);  in agp_alloc_bridge()
246 	atomic_set(&bridge->current_memory_agp, 0);  in agp_alloc_bridge()
249 		agp_bridge = bridge;  in agp_alloc_bridge()
251 	return bridge;  in agp_alloc_bridge()
256 void agp_put_bridge(struct agp_bridge_data *bridge)  in agp_put_bridge()  argument
258         kfree(bridge);  in agp_put_bridge()
266 int agp_add_bridge(struct agp_bridge_data *bridge)  in agp_add_bridge()  argument
275 	if (!bridge->dev) {  in agp_add_bridge()
282 	if (!try_module_get(bridge->driver->owner)) {  in agp_add_bridge()
283 		dev_info(&bridge->dev->dev, "can't lock chipset driver\n");  in agp_add_bridge()
288 	error = agp_backend_initialize(bridge);  in agp_add_bridge()
290 		dev_info(&bridge->dev->dev,  in agp_add_bridge()
298 			dev_info(&bridge->dev->dev,  in agp_add_bridge()
303 		dev_info(&bridge->dev->dev, "AGP aperture is %dM @ 0x%lx\n",  in agp_add_bridge()
304 			 bridge->driver->fetch_size(), bridge->gart_bus_addr);  in agp_add_bridge()
308 	list_add(&bridge->list, &agp_bridges);  in agp_add_bridge()
312 	agp_backend_cleanup(bridge);  in agp_add_bridge()
314 	module_put(bridge->driver->owner);  in agp_add_bridge()
316 	agp_put_bridge(bridge);  in agp_add_bridge()
322 void agp_remove_bridge(struct agp_bridge_data *bridge)  in agp_remove_bridge()  argument
324 	agp_backend_cleanup(bridge);  in agp_remove_bridge()
325 	list_del(&bridge->list);  in agp_remove_bridge()
328 	module_put(bridge->driver->owner);  in agp_remove_bridge()