char/agp/backend.c

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