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 void *addr = 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 = virt_to_gart(addr);
153 bridge->scratch_page =
154 bridge->driver->mask_memory(bridge, bridge->scratch_page_real, 0);
157 size_value = bridge->driver->fetch_size();
158 if (size_value == 0) {
159 dev_err(&bridge->dev->dev, "can't determine aperture size\n");
163 if (bridge->driver->create_gatt_table(bridge)) {
164 dev_err(&bridge->dev->dev,
165 "can't get memory for graphics translation table\n");
171 bridge->key_list = vmalloc(PAGE_SIZE * 4);
172 if (bridge->key_list == NULL) {
173 dev_err(&bridge->dev->dev,
174 "can't allocate memory for key lists\n");
180 /* FIXME vmalloc'd memory not guaranteed contiguous */
181 memset(bridge->key_list, 0, PAGE_SIZE * 4);
183 if (bridge->driver->configure()) {
184 dev_err(&bridge->dev->dev, "error configuring host chipset\n");
192 if (bridge->driver->needs_scratch_page) {
193 void *va = gart_to_virt(bridge->scratch_page_real);
195 bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_UNMAP);
196 bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_FREE);
199 bridge->driver->free_gatt_table(bridge);
201 vfree(bridge->key_list);
202 bridge->key_list = NULL;
207 /* cannot be __exit b/c as it could be called from __init code */
208 static void agp_backend_cleanup(struct agp_bridge_data *bridge)
210 if (bridge->driver->cleanup)
211 bridge->driver->cleanup();
212 if (bridge->driver->free_gatt_table)
213 bridge->driver->free_gatt_table(bridge);
215 vfree(bridge->key_list);
216 bridge->key_list = NULL;
218 if (bridge->driver->agp_destroy_page &&
219 bridge->driver->needs_scratch_page) {
220 void *va = gart_to_virt(bridge->scratch_page_real);
222 bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_UNMAP);
223 bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_FREE);
227 /* When we remove the global variable agp_bridge from all drivers
228 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
231 struct agp_bridge_data *agp_alloc_bridge(void)
233 struct agp_bridge_data *bridge;
235 bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
239 atomic_set(&bridge->agp_in_use, 0);
240 atomic_set(&bridge->current_memory_agp, 0);
242 if (list_empty(&agp_bridges))
247 EXPORT_SYMBOL(agp_alloc_bridge);
250 void agp_put_bridge(struct agp_bridge_data *bridge)
254 if (list_empty(&agp_bridges))
257 EXPORT_SYMBOL(agp_put_bridge);
260 int agp_add_bridge(struct agp_bridge_data *bridge)
268 printk (KERN_DEBUG PFX "Erk, registering with no pci_dev!\n");
272 /* Grab reference on the chipset driver. */
273 if (!try_module_get(bridge->driver->owner)) {
274 dev_info(&bridge->dev->dev, "can't lock chipset driver\n");
278 error = agp_backend_initialize(bridge);
280 dev_info(&bridge->dev->dev,
281 "agp_backend_initialize() failed\n");
285 if (list_empty(&agp_bridges)) {
286 error = agp_frontend_initialize();
288 dev_info(&bridge->dev->dev,
289 "agp_frontend_initialize() failed\n");
293 dev_info(&bridge->dev->dev, "AGP aperture is %dM @ 0x%lx\n",
294 bridge->driver->fetch_size(), bridge->gart_bus_addr);
298 list_add(&bridge->list, &agp_bridges);
302 agp_backend_cleanup(bridge);
304 module_put(bridge->driver->owner);
305 agp_put_bridge(bridge);
308 EXPORT_SYMBOL_GPL(agp_add_bridge);
311 void agp_remove_bridge(struct agp_bridge_data *bridge)
313 agp_backend_cleanup(bridge);
314 list_del(&bridge->list);
315 if (list_empty(&agp_bridges))
316 agp_frontend_cleanup();
317 module_put(bridge->driver->owner);
319 EXPORT_SYMBOL_GPL(agp_remove_bridge);
322 int agp_try_unsupported_boot;
323 EXPORT_SYMBOL(agp_off);
324 EXPORT_SYMBOL(agp_try_unsupported_boot);
326 static int __init agp_init(void)
329 printk(KERN_INFO "Linux agpgart interface v%d.%d\n",
330 AGPGART_VERSION_MAJOR, AGPGART_VERSION_MINOR);
334 static void __exit agp_exit(void)
339 static __init int agp_setup(char *s)
341 if (!strcmp(s,"off"))
343 if (!strcmp(s,"try_unsupported"))
344 agp_try_unsupported_boot = 1;
347 __setup("agp=", agp_setup);
350 MODULE_AUTHOR("Dave Jones <davej@codemonkey.org.uk>");
351 MODULE_DESCRIPTION("AGP GART driver");
352 MODULE_LICENSE("GPL and additional rights");
353 MODULE_ALIAS_MISCDEV(AGPGART_MINOR);
355 module_init(agp_init);
356 module_exit(agp_exit);