2  * AGPGART driver backend routines.
4  * Copyright (C) 2002-2003 Dave Jones.
10  * copy of this software and associated documentation files (the "Software"),
11  * to deal in the Software without restriction, including without limitation
13  * and/or sell copies of the Software, and to permit persons to whom the
14  * Software is furnished to do so, subject to the following conditions:
17  * in all copies or substantial portions of the Software.
19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
24  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
25  * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
28  * - Allocate more than order 0 pages to avoid too much linear map splitting.
43 /* Due to XFree86 brain-damage, we can't go to 1.0 until they
64  *	agp_backend_acquire  -  attempt to acquire an agp backend.
77 	if (atomic_read(&bridge->agp_in_use))  in agp_backend_acquire()
79 	atomic_inc(&bridge->agp_in_use);  in agp_backend_acquire()
86  *	agp_backend_release  -  release the lock on the agp backend.
98 		atomic_dec(&bridge->agp_in_use);  in agp_backend_release()
120 	memory = totalram_pages() >> (20 - PAGE_SHIFT);  in agp_find_max()
122 	memory = totalram_pages() << (PAGE_SHIFT - 20);  in agp_find_max()
129 	result = maxes_table[index - 1].agp +  in agp_find_max()
130 	   ( (memory - maxes_table[index - 1].mem)  *  in agp_find_max()
131 	     (maxes_table[index].agp - maxes_table[index - 1].agp)) /  in agp_find_max()
132 	   (maxes_table[index].mem - maxes_table[index - 1].mem);  in agp_find_max()
134 	result = result << (20 - PAGE_SHIFT);  in agp_find_max()
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()
152 			return -ENOMEM;  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()
165 		rc = -EINVAL;  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()
171 		rc = -ENOMEM;  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()
180 		rc = -ENOMEM;  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()
189 		rc = -EINVAL;  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()
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()
245 	atomic_set(&bridge->agp_in_use, 0);  in agp_alloc_bridge()
246 	atomic_set(&bridge->current_memory_agp, 0);  in agp_alloc_bridge()
271 		error = -ENODEV;  in agp_add_bridge()
275 	if (!bridge->dev) {  in agp_add_bridge()
277 		error = -EINVAL;  in agp_add_bridge()
281 	/* Grab reference on the chipset driver. */  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()
284 		error = -EINVAL;  in agp_add_bridge()
290 		dev_info(&bridge->dev->dev,  in agp_add_bridge()
296 		dev_info(&bridge->dev->dev, "AGP aperture is %dM @ 0x%lx\n",  in agp_add_bridge()
297 			 bridge->driver->fetch_size(), bridge->gart_bus_addr);  in agp_add_bridge()
301 	list_add(&bridge->list, &agp_bridges);  in agp_add_bridge()
305 	module_put(bridge->driver->owner);  in agp_add_bridge()
316 	list_del(&bridge->list);  in agp_remove_bridge()
317 	module_put(bridge->driver->owner);  in agp_remove_bridge()
351 MODULE_DESCRIPTION("AGP GART driver");