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/slab.h>
34 #include <linux/pagemap.h>
35 #include <linux/miscdevice.h>
37 #include <linux/agp_backend.h>
38 #include <linux/agpgart.h>
39 #include <linux/vmalloc.h>
43 /* Due to XFree86 brain-damage, we can't go to 1.0 until they
44 * fix some real stupidity. It's only by chance we can bump
45 * past 0.99 at all due to some boolean logic error. */
46 #define AGPGART_VERSION_MAJOR 0
47 #define AGPGART_VERSION_MINOR 103
48 static const struct agp_version agp_current_version
=
50 .major
= AGPGART_VERSION_MAJOR
,
51 .minor
= AGPGART_VERSION_MINOR
,
54 struct agp_bridge_data
*(*agp_find_bridge
)(struct pci_dev
*) =
55 &agp_generic_find_bridge
;
57 struct agp_bridge_data
*agp_bridge
;
58 LIST_HEAD(agp_bridges
);
59 EXPORT_SYMBOL(agp_bridge
);
60 EXPORT_SYMBOL(agp_bridges
);
61 EXPORT_SYMBOL(agp_find_bridge
);
64 * agp_backend_acquire - attempt to acquire an agp backend.
67 struct agp_bridge_data
*agp_backend_acquire(struct pci_dev
*pdev
)
69 struct agp_bridge_data
*bridge
;
71 bridge
= agp_find_bridge(pdev
);
76 if (atomic_read(&bridge
->agp_in_use
))
78 atomic_inc(&bridge
->agp_in_use
);
81 EXPORT_SYMBOL(agp_backend_acquire
);
85 * agp_backend_release - release the lock on the agp backend.
87 * The caller must insure that the graphics aperture translation table
88 * is read for use by another entity.
90 * (Ensure that all memory it bound is unbound.)
92 void agp_backend_release(struct agp_bridge_data
*bridge
)
96 atomic_dec(&bridge
->agp_in_use
);
98 EXPORT_SYMBOL(agp_backend_release
);
101 static const struct { int mem
, agp
; } maxes_table
[] = {
113 static int agp_find_max(void)
115 long memory
, index
, result
;
118 memory
= totalram_pages() >> (20 - PAGE_SHIFT
);
120 memory
= totalram_pages() << (PAGE_SHIFT
- 20);
124 while ((memory
> maxes_table
[index
].mem
) && (index
< 8))
127 result
= maxes_table
[index
- 1].agp
+
128 ( (memory
- maxes_table
[index
- 1].mem
) *
129 (maxes_table
[index
].agp
- maxes_table
[index
- 1].agp
)) /
130 (maxes_table
[index
].mem
- maxes_table
[index
- 1].mem
);
132 result
= result
<< (20 - PAGE_SHIFT
);
137 static int agp_backend_initialize(struct agp_bridge_data
*bridge
)
139 int size_value
, rc
, got_gatt
=0, got_keylist
=0;
141 bridge
->max_memory_agp
= agp_find_max();
142 bridge
->version
= &agp_current_version
;
144 if (bridge
->driver
->needs_scratch_page
) {
145 struct page
*page
= bridge
->driver
->agp_alloc_page(bridge
);
148 dev_err(&bridge
->dev
->dev
,
149 "can't get memory for scratch page\n");
153 bridge
->scratch_page_page
= page
;
154 bridge
->scratch_page_dma
= page_to_phys(page
);
156 bridge
->scratch_page
= bridge
->driver
->mask_memory(bridge
,
157 bridge
->scratch_page_dma
, 0);
160 size_value
= bridge
->driver
->fetch_size();
161 if (size_value
== 0) {
162 dev_err(&bridge
->dev
->dev
, "can't determine aperture size\n");
166 if (bridge
->driver
->create_gatt_table(bridge
)) {
167 dev_err(&bridge
->dev
->dev
,
168 "can't get memory for graphics translation table\n");
174 bridge
->key_list
= vzalloc(PAGE_SIZE
* 4);
175 if (bridge
->key_list
== NULL
) {
176 dev_err(&bridge
->dev
->dev
,
177 "can't allocate memory for key lists\n");
183 /* FIXME vmalloc'd memory not guaranteed contiguous */
185 if (bridge
->driver
->configure()) {
186 dev_err(&bridge
->dev
->dev
, "error configuring host chipset\n");
190 INIT_LIST_HEAD(&bridge
->mapped_list
);
191 spin_lock_init(&bridge
->mapped_lock
);
196 if (bridge
->driver
->needs_scratch_page
) {
197 struct page
*page
= bridge
->scratch_page_page
;
199 bridge
->driver
->agp_destroy_page(page
, AGP_PAGE_DESTROY_UNMAP
);
200 bridge
->driver
->agp_destroy_page(page
, AGP_PAGE_DESTROY_FREE
);
203 bridge
->driver
->free_gatt_table(bridge
);
205 vfree(bridge
->key_list
);
206 bridge
->key_list
= NULL
;
211 /* cannot be __exit b/c as it could be called from __init code */
212 static void agp_backend_cleanup(struct agp_bridge_data
*bridge
)
214 if (bridge
->driver
->cleanup
)
215 bridge
->driver
->cleanup();
216 if (bridge
->driver
->free_gatt_table
)
217 bridge
->driver
->free_gatt_table(bridge
);
219 vfree(bridge
->key_list
);
220 bridge
->key_list
= NULL
;
222 if (bridge
->driver
->agp_destroy_page
&&
223 bridge
->driver
->needs_scratch_page
) {
224 struct page
*page
= bridge
->scratch_page_page
;
226 bridge
->driver
->agp_destroy_page(page
, AGP_PAGE_DESTROY_UNMAP
);
227 bridge
->driver
->agp_destroy_page(page
, AGP_PAGE_DESTROY_FREE
);
231 /* When we remove the global variable agp_bridge from all drivers
232 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
235 struct agp_bridge_data
*agp_alloc_bridge(void)
237 struct agp_bridge_data
*bridge
;
239 bridge
= kzalloc(sizeof(*bridge
), GFP_KERNEL
);
243 atomic_set(&bridge
->agp_in_use
, 0);
244 atomic_set(&bridge
->current_memory_agp
, 0);
246 if (list_empty(&agp_bridges
))
251 EXPORT_SYMBOL(agp_alloc_bridge
);
254 void agp_put_bridge(struct agp_bridge_data
*bridge
)
258 if (list_empty(&agp_bridges
))
261 EXPORT_SYMBOL(agp_put_bridge
);
264 int agp_add_bridge(struct agp_bridge_data
*bridge
)
274 printk (KERN_DEBUG PFX
"Erk, registering with no pci_dev!\n");
279 /* Grab reference on the chipset driver. */
280 if (!try_module_get(bridge
->driver
->owner
)) {
281 dev_info(&bridge
->dev
->dev
, "can't lock chipset driver\n");
286 error
= agp_backend_initialize(bridge
);
288 dev_info(&bridge
->dev
->dev
,
289 "agp_backend_initialize() failed\n");
293 if (list_empty(&agp_bridges
)) {
294 error
= agp_frontend_initialize();
296 dev_info(&bridge
->dev
->dev
,
297 "agp_frontend_initialize() failed\n");
301 dev_info(&bridge
->dev
->dev
, "AGP aperture is %dM @ 0x%lx\n",
302 bridge
->driver
->fetch_size(), bridge
->gart_bus_addr
);
306 list_add(&bridge
->list
, &agp_bridges
);
310 agp_backend_cleanup(bridge
);
312 module_put(bridge
->driver
->owner
);
314 agp_put_bridge(bridge
);
317 EXPORT_SYMBOL_GPL(agp_add_bridge
);
320 void agp_remove_bridge(struct agp_bridge_data
*bridge
)
322 agp_backend_cleanup(bridge
);
323 list_del(&bridge
->list
);
324 if (list_empty(&agp_bridges
))
325 agp_frontend_cleanup();
326 module_put(bridge
->driver
->owner
);
328 EXPORT_SYMBOL_GPL(agp_remove_bridge
);
331 int agp_try_unsupported_boot
;
332 EXPORT_SYMBOL(agp_off
);
333 EXPORT_SYMBOL(agp_try_unsupported_boot
);
335 static int __init
agp_init(void)
338 printk(KERN_INFO
"Linux agpgart interface v%d.%d\n",
339 AGPGART_VERSION_MAJOR
, AGPGART_VERSION_MINOR
);
343 static void __exit
agp_exit(void)
348 static __init
int agp_setup(char *s
)
350 if (!strcmp(s
,"off"))
352 if (!strcmp(s
,"try_unsupported"))
353 agp_try_unsupported_boot
= 1;
356 __setup("agp=", agp_setup
);
359 MODULE_AUTHOR("Dave Jones, Jeff Hartmann");
360 MODULE_DESCRIPTION("AGP GART driver");
361 MODULE_LICENSE("GPL and additional rights");
362 MODULE_ALIAS_MISCDEV(AGPGART_MINOR
);
364 module_init(agp_init
);
365 module_exit(agp_exit
);