2 * AGPGART driver backend routines.
3 * Copyright (C) 2004 Silicon Graphics, Inc.
4 * Copyright (C) 2002-2003 Dave Jones.
5 * Copyright (C) 1999 Jeff Hartmann.
6 * Copyright (C) 1999 Precision Insight, Inc.
7 * Copyright (C) 1999 Xi Graphics, Inc.
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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:
16 * The above copyright notice and this permission notice shall be included
17 * in all copies or substantial portions of the Software.
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * JEFF HARTMANN, DAVE JONES, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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.
30 #include <linux/module.h>
31 #include <linux/pci.h>
32 #include <linux/init.h>
33 #include <linux/pagemap.h>
34 #include <linux/miscdevice.h>
36 #include <linux/agp_backend.h>
37 #include <linux/agpgart.h>
38 #include <linux/vmalloc.h>
42 /* Due to XFree86 brain-damage, we can't go to 1.0 until they
43 * fix some real stupidity. It's only by chance we can bump
44 * past 0.99 at all due to some boolean logic error. */
45 #define AGPGART_VERSION_MAJOR 0
46 #define AGPGART_VERSION_MINOR 103
47 static const struct agp_version agp_current_version =
49 .major = AGPGART_VERSION_MAJOR,
50 .minor = AGPGART_VERSION_MINOR,
53 struct agp_bridge_data *(*agp_find_bridge)(struct pci_dev *) =
54 &agp_generic_find_bridge;
56 struct agp_bridge_data *agp_bridge;
57 LIST_HEAD(agp_bridges);
58 EXPORT_SYMBOL(agp_bridge);
59 EXPORT_SYMBOL(agp_bridges);
60 EXPORT_SYMBOL(agp_find_bridge);
63 * agp_backend_acquire - attempt to acquire an agp backend.
66 struct agp_bridge_data *agp_backend_acquire(struct pci_dev *pdev)
68 struct agp_bridge_data *bridge;
70 bridge = agp_find_bridge(pdev);
75 if (atomic_read(&bridge->agp_in_use))
77 atomic_inc(&bridge->agp_in_use);
80 EXPORT_SYMBOL(agp_backend_acquire);
84 * agp_backend_release - release the lock on the agp backend.
86 * The caller must insure that the graphics aperture translation table
87 * is read for use by another entity.
89 * (Ensure that all memory it bound is unbound.)
91 void agp_backend_release(struct agp_bridge_data *bridge)
95 atomic_dec(&bridge->agp_in_use);
97 EXPORT_SYMBOL(agp_backend_release);
100 static const struct { int mem, agp; } maxes_table[] = {
112 static int agp_find_max(void)
114 long memory, index, result;
117 memory = num_physpages >> (20 - PAGE_SHIFT);
119 memory = num_physpages << (PAGE_SHIFT - 20);
123 while ((memory > maxes_table[index].mem) && (index < 8))
126 result = maxes_table[index - 1].agp +
127 ( (memory - maxes_table[index - 1].mem) *
128 (maxes_table[index].agp - maxes_table[index - 1].agp)) /
129 (maxes_table[index].mem - maxes_table[index - 1].mem);
131 result = result << (20 - PAGE_SHIFT);
136 static int agp_backend_initialize(struct agp_bridge_data *bridge)
138 int size_value, rc, got_gatt=0, got_keylist=0;
140 bridge->max_memory_agp = agp_find_max();
141 bridge->version = &agp_current_version;
143 if (bridge->driver->needs_scratch_page) {
144 struct page *page = bridge->driver->agp_alloc_page(bridge);
147 dev_err(&bridge->dev->dev,
148 "can't get memory for scratch page\n");
152 bridge->scratch_page_real = phys_to_gart(page_to_phys(page));
153 bridge->scratch_page = bridge->driver->mask_memory(bridge,
154 phys_to_gart(page_to_phys(page)), 0);
156 if (bridge->driver->agp_map_page &&
157 bridge->driver->agp_map_page(phys_to_virt(page_to_phys(page)),
158 &bridge->scratch_page_dma)) {
159 dev_err(&bridge->dev->dev,
160 "unable to dma-map scratch page\n");
162 goto err_out_nounmap;
166 size_value = bridge->driver->fetch_size();
167 if (size_value == 0) {
168 dev_err(&bridge->dev->dev, "can't determine aperture size\n");
172 if (bridge->driver->create_gatt_table(bridge)) {
173 dev_err(&bridge->dev->dev,
174 "can't get memory for graphics translation table\n");
180 bridge->key_list = vmalloc(PAGE_SIZE * 4);
181 if (bridge->key_list == NULL) {
182 dev_err(&bridge->dev->dev,
183 "can't allocate memory for key lists\n");
189 /* FIXME vmalloc'd memory not guaranteed contiguous */
190 memset(bridge->key_list, 0, PAGE_SIZE * 4);
192 if (bridge->driver->configure()) {
193 dev_err(&bridge->dev->dev, "error configuring host chipset\n");
197 INIT_LIST_HEAD(&bridge->mapped_list);
198 spin_lock_init(&bridge->mapped_lock);
203 if (bridge->driver->needs_scratch_page &&
204 bridge->driver->agp_unmap_page) {
205 void *va = gart_to_virt(bridge->scratch_page_real);
207 bridge->driver->agp_unmap_page(va, bridge->scratch_page_dma);
210 if (bridge->driver->needs_scratch_page) {
211 void *va = gart_to_virt(bridge->scratch_page_real);
213 bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_UNMAP);
214 bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_FREE);
217 bridge->driver->free_gatt_table(bridge);
219 vfree(bridge->key_list);
220 bridge->key_list = NULL;
225 /* cannot be __exit b/c as it could be called from __init code */
226 static void agp_backend_cleanup(struct agp_bridge_data *bridge)
228 if (bridge->driver->cleanup)
229 bridge->driver->cleanup();
230 if (bridge->driver->free_gatt_table)
231 bridge->driver->free_gatt_table(bridge);
233 vfree(bridge->key_list);
234 bridge->key_list = NULL;
236 if (bridge->driver->agp_destroy_page &&
237 bridge->driver->needs_scratch_page) {
238 void *va = gart_to_virt(bridge->scratch_page_real);
240 if (bridge->driver->agp_unmap_page)
241 bridge->driver->agp_unmap_page(va,
242 bridge->scratch_page_dma);
244 bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_UNMAP);
245 bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_FREE);
249 /* When we remove the global variable agp_bridge from all drivers
250 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
253 struct agp_bridge_data *agp_alloc_bridge(void)
255 struct agp_bridge_data *bridge;
257 bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
261 atomic_set(&bridge->agp_in_use, 0);
262 atomic_set(&bridge->current_memory_agp, 0);
264 if (list_empty(&agp_bridges))
269 EXPORT_SYMBOL(agp_alloc_bridge);
272 void agp_put_bridge(struct agp_bridge_data *bridge)
276 if (list_empty(&agp_bridges))
279 EXPORT_SYMBOL(agp_put_bridge);
282 int agp_add_bridge(struct agp_bridge_data *bridge)
290 printk (KERN_DEBUG PFX "Erk, registering with no pci_dev!\n");
294 /* Grab reference on the chipset driver. */
295 if (!try_module_get(bridge->driver->owner)) {
296 dev_info(&bridge->dev->dev, "can't lock chipset driver\n");
300 error = agp_backend_initialize(bridge);
302 dev_info(&bridge->dev->dev,
303 "agp_backend_initialize() failed\n");
307 if (list_empty(&agp_bridges)) {
308 error = agp_frontend_initialize();
310 dev_info(&bridge->dev->dev,
311 "agp_frontend_initialize() failed\n");
315 dev_info(&bridge->dev->dev, "AGP aperture is %dM @ 0x%lx\n",
316 bridge->driver->fetch_size(), bridge->gart_bus_addr);
320 list_add(&bridge->list, &agp_bridges);
324 agp_backend_cleanup(bridge);
326 module_put(bridge->driver->owner);
327 agp_put_bridge(bridge);
330 EXPORT_SYMBOL_GPL(agp_add_bridge);
333 void agp_remove_bridge(struct agp_bridge_data *bridge)
335 agp_backend_cleanup(bridge);
336 list_del(&bridge->list);
337 if (list_empty(&agp_bridges))
338 agp_frontend_cleanup();
339 module_put(bridge->driver->owner);
341 EXPORT_SYMBOL_GPL(agp_remove_bridge);
344 int agp_try_unsupported_boot;
345 EXPORT_SYMBOL(agp_off);
346 EXPORT_SYMBOL(agp_try_unsupported_boot);
348 static int __init agp_init(void)
351 printk(KERN_INFO "Linux agpgart interface v%d.%d\n",
352 AGPGART_VERSION_MAJOR, AGPGART_VERSION_MINOR);
356 static void __exit agp_exit(void)
361 static __init int agp_setup(char *s)
363 if (!strcmp(s,"off"))
365 if (!strcmp(s,"try_unsupported"))
366 agp_try_unsupported_boot = 1;
369 __setup("agp=", agp_setup);
372 MODULE_AUTHOR("Dave Jones <davej@redhat.com>");
373 MODULE_DESCRIPTION("AGP GART driver");
374 MODULE_LICENSE("GPL and additional rights");
375 MODULE_ALIAS_MISCDEV(AGPGART_MINOR);
377 module_init(agp_init);
378 module_exit(agp_exit);