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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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.
8 *
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:
15 *
16 * The above copyright notice and this permission notice shall be included
17 * in all copies or substantial portions of the Software.
18 *
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.
26 *
27 * TODO:
28 * - Allocate more than order 0 pages to avoid too much linear map splitting.
29 */
30#include <linux/module.h>
31#include <linux/pci.h>
32#include <linux/init.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090033#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/pagemap.h>
35#include <linux/miscdevice.h>
36#include <linux/pm.h>
37#include <linux/agp_backend.h>
38#include <linux/agpgart.h>
39#include <linux/vmalloc.h>
40#include <asm/io.h>
41#include "agp.h"
42
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
Dave Airliea13af4b2007-10-29 15:14:03 +100047#define AGPGART_VERSION_MINOR 103
Dave Jonese7745d42006-08-11 18:02:27 -040048static const struct agp_version agp_current_version =
Linus Torvalds1da177e2005-04-16 15:20:36 -070049{
50 .major = AGPGART_VERSION_MAJOR,
51 .minor = AGPGART_VERSION_MINOR,
52};
53
54struct agp_bridge_data *(*agp_find_bridge)(struct pci_dev *) =
55 &agp_generic_find_bridge;
56
57struct agp_bridge_data *agp_bridge;
58LIST_HEAD(agp_bridges);
59EXPORT_SYMBOL(agp_bridge);
60EXPORT_SYMBOL(agp_bridges);
61EXPORT_SYMBOL(agp_find_bridge);
62
63/**
64 * agp_backend_acquire - attempt to acquire an agp backend.
65 *
66 */
67struct agp_bridge_data *agp_backend_acquire(struct pci_dev *pdev)
68{
69 struct agp_bridge_data *bridge;
70
71 bridge = agp_find_bridge(pdev);
72
73 if (!bridge)
74 return NULL;
75
76 if (atomic_read(&bridge->agp_in_use))
77 return NULL;
78 atomic_inc(&bridge->agp_in_use);
79 return bridge;
80}
81EXPORT_SYMBOL(agp_backend_acquire);
82
83
84/**
85 * agp_backend_release - release the lock on the agp backend.
86 *
87 * The caller must insure that the graphics aperture translation table
88 * is read for use by another entity.
89 *
90 * (Ensure that all memory it bound is unbound.)
91 */
92void agp_backend_release(struct agp_bridge_data *bridge)
93{
94
95 if (bridge)
96 atomic_dec(&bridge->agp_in_use);
97}
98EXPORT_SYMBOL(agp_backend_release);
99
100
Dave Jones5e9ad062005-11-16 16:05:49 -0800101static const struct { int mem, agp; } maxes_table[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 {0, 0},
103 {32, 4},
104 {64, 28},
105 {128, 96},
106 {256, 204},
107 {512, 440},
108 {1024, 942},
109 {2048, 1920},
110 {4096, 3932}
111};
112
113static int agp_find_max(void)
114{
115 long memory, index, result;
116
117#if PAGE_SHIFT < 20
Jan Beulich44813742009-09-21 17:03:05 -0700118 memory = totalram_pages >> (20 - PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119#else
Jan Beulich44813742009-09-21 17:03:05 -0700120 memory = totalram_pages << (PAGE_SHIFT - 20);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121#endif
122 index = 1;
123
124 while ((memory > maxes_table[index].mem) && (index < 8))
125 index++;
126
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);
131
132 result = result << (20 - PAGE_SHIFT);
133 return result;
134}
135
136
137static int agp_backend_initialize(struct agp_bridge_data *bridge)
138{
139 int size_value, rc, got_gatt=0, got_keylist=0;
140
141 bridge->max_memory_agp = agp_find_max();
142 bridge->version = &agp_current_version;
143
144 if (bridge->driver->needs_scratch_page) {
Dave Airlie07613ba2009-06-12 14:11:41 +1000145 struct page *page = bridge->driver->agp_alloc_page(bridge);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
Dave Airlie07613ba2009-06-12 14:11:41 +1000147 if (!page) {
Bjorn Helgaase3cf6952008-07-30 12:26:51 -0700148 dev_err(&bridge->dev->dev,
149 "can't get memory for scratch page\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 return -ENOMEM;
151 }
152
David Woodhousec2980d82009-07-29 08:39:26 +0100153 bridge->scratch_page_page = page;
Daniel Vettera87aa5c2010-09-09 18:17:34 +0200154 bridge->scratch_page_dma = page_to_phys(page);
David Woodhouse56ec4c12009-07-27 16:44:32 +0100155
156 bridge->scratch_page = bridge->driver->mask_memory(bridge,
157 bridge->scratch_page_dma, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 }
159
160 size_value = bridge->driver->fetch_size();
161 if (size_value == 0) {
Bjorn Helgaase3cf6952008-07-30 12:26:51 -0700162 dev_err(&bridge->dev->dev, "can't determine aperture size\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 rc = -EINVAL;
164 goto err_out;
165 }
166 if (bridge->driver->create_gatt_table(bridge)) {
Bjorn Helgaase3cf6952008-07-30 12:26:51 -0700167 dev_err(&bridge->dev->dev,
168 "can't get memory for graphics translation table\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 rc = -ENOMEM;
170 goto err_out;
171 }
172 got_gatt = 1;
173
Joe Perches8e03bd62011-05-28 10:36:25 -0700174 bridge->key_list = vzalloc(PAGE_SIZE * 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 if (bridge->key_list == NULL) {
Bjorn Helgaase3cf6952008-07-30 12:26:51 -0700176 dev_err(&bridge->dev->dev,
177 "can't allocate memory for key lists\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 rc = -ENOMEM;
179 goto err_out;
180 }
181 got_keylist = 1;
182
183 /* FIXME vmalloc'd memory not guaranteed contiguous */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184
185 if (bridge->driver->configure()) {
Bjorn Helgaase3cf6952008-07-30 12:26:51 -0700186 dev_err(&bridge->dev->dev, "error configuring host chipset\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 rc = -EINVAL;
188 goto err_out;
189 }
Keith Packarda8c84df2008-07-31 15:48:07 +1000190 INIT_LIST_HEAD(&bridge->mapped_list);
191 spin_lock_init(&bridge->mapped_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
193 return 0;
194
195err_out:
Alan Hourihane88d51962005-11-06 23:35:34 -0800196 if (bridge->driver->needs_scratch_page) {
Michal Kubecek590dfe22012-01-25 16:51:05 +0100197 struct page *page = bridge->scratch_page_page;
Jan Beulichda503fa2008-06-18 09:28:00 +0100198
Michal Kubecek590dfe22012-01-25 16:51:05 +0100199 bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_UNMAP);
200 bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_FREE);
Alan Hourihane88d51962005-11-06 23:35:34 -0800201 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 if (got_gatt)
203 bridge->driver->free_gatt_table(bridge);
204 if (got_keylist) {
205 vfree(bridge->key_list);
206 bridge->key_list = NULL;
207 }
208 return rc;
209}
210
211/* cannot be __exit b/c as it could be called from __init code */
212static void agp_backend_cleanup(struct agp_bridge_data *bridge)
213{
214 if (bridge->driver->cleanup)
215 bridge->driver->cleanup();
216 if (bridge->driver->free_gatt_table)
217 bridge->driver->free_gatt_table(bridge);
Jesper Juhlf91012102005-09-10 00:26:54 -0700218
219 vfree(bridge->key_list);
220 bridge->key_list = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
222 if (bridge->driver->agp_destroy_page &&
Alan Hourihane88d51962005-11-06 23:35:34 -0800223 bridge->driver->needs_scratch_page) {
Michal Kubecek590dfe22012-01-25 16:51:05 +0100224 struct page *page = bridge->scratch_page_page;
Jan Beulichda503fa2008-06-18 09:28:00 +0100225
Michal Kubecek590dfe22012-01-25 16:51:05 +0100226 bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_UNMAP);
227 bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_FREE);
Alan Hourihane88d51962005-11-06 23:35:34 -0800228 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229}
230
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
233 */
234
235struct agp_bridge_data *agp_alloc_bridge(void)
236{
Dave Jones0ea27d92005-10-20 15:12:16 -0700237 struct agp_bridge_data *bridge;
Dave Jones6a92a4e2006-02-28 00:54:25 -0500238
Dave Jones0ea27d92005-10-20 15:12:16 -0700239 bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 if (!bridge)
241 return NULL;
242
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 atomic_set(&bridge->agp_in_use, 0);
244 atomic_set(&bridge->current_memory_agp, 0);
245
246 if (list_empty(&agp_bridges))
247 agp_bridge = bridge;
248
249 return bridge;
250}
251EXPORT_SYMBOL(agp_alloc_bridge);
252
253
254void agp_put_bridge(struct agp_bridge_data *bridge)
255{
256 kfree(bridge);
257
258 if (list_empty(&agp_bridges))
259 agp_bridge = NULL;
260}
261EXPORT_SYMBOL(agp_put_bridge);
262
263
264int agp_add_bridge(struct agp_bridge_data *bridge)
265{
266 int error;
267
Kevin Winchester3f50b022009-11-17 14:38:45 -0800268 if (agp_off) {
269 error = -ENODEV;
270 goto err_put_bridge;
271 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
273 if (!bridge->dev) {
274 printk (KERN_DEBUG PFX "Erk, registering with no pci_dev!\n");
Kevin Winchester3f50b022009-11-17 14:38:45 -0800275 error = -EINVAL;
276 goto err_put_bridge;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 }
278
279 /* Grab reference on the chipset driver. */
280 if (!try_module_get(bridge->driver->owner)) {
Bjorn Helgaase3cf6952008-07-30 12:26:51 -0700281 dev_info(&bridge->dev->dev, "can't lock chipset driver\n");
Kevin Winchester3f50b022009-11-17 14:38:45 -0800282 error = -EINVAL;
283 goto err_put_bridge;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 }
285
286 error = agp_backend_initialize(bridge);
287 if (error) {
Bjorn Helgaase3cf6952008-07-30 12:26:51 -0700288 dev_info(&bridge->dev->dev,
289 "agp_backend_initialize() failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 goto err_out;
291 }
292
293 if (list_empty(&agp_bridges)) {
294 error = agp_frontend_initialize();
295 if (error) {
Bjorn Helgaase3cf6952008-07-30 12:26:51 -0700296 dev_info(&bridge->dev->dev,
297 "agp_frontend_initialize() failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 goto frontend_err;
299 }
300
Bjorn Helgaase3cf6952008-07-30 12:26:51 -0700301 dev_info(&bridge->dev->dev, "AGP aperture is %dM @ 0x%lx\n",
302 bridge->driver->fetch_size(), bridge->gart_bus_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
304 }
305
306 list_add(&bridge->list, &agp_bridges);
307 return 0;
308
309frontend_err:
310 agp_backend_cleanup(bridge);
311err_out:
312 module_put(bridge->driver->owner);
Kevin Winchester3f50b022009-11-17 14:38:45 -0800313err_put_bridge:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 agp_put_bridge(bridge);
315 return error;
316}
317EXPORT_SYMBOL_GPL(agp_add_bridge);
318
319
320void agp_remove_bridge(struct agp_bridge_data *bridge)
321{
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);
327}
328EXPORT_SYMBOL_GPL(agp_remove_bridge);
329
330int agp_off;
331int agp_try_unsupported_boot;
332EXPORT_SYMBOL(agp_off);
333EXPORT_SYMBOL(agp_try_unsupported_boot);
334
335static int __init agp_init(void)
336{
337 if (!agp_off)
Dave Jones70e89922007-07-09 20:23:50 -0400338 printk(KERN_INFO "Linux agpgart interface v%d.%d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 AGPGART_VERSION_MAJOR, AGPGART_VERSION_MINOR);
340 return 0;
341}
342
Adrian Bunk408b6642005-05-01 08:59:29 -0700343static void __exit agp_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344{
345}
346
347#ifndef MODULE
348static __init int agp_setup(char *s)
349{
350 if (!strcmp(s,"off"))
351 agp_off = 1;
352 if (!strcmp(s,"try_unsupported"))
353 agp_try_unsupported_boot = 1;
354 return 1;
355}
356__setup("agp=", agp_setup);
357#endif
358
Dave Jonesbd8136d2014-12-19 11:23:50 -0500359MODULE_AUTHOR("Dave Jones, Jeff Hartmann");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360MODULE_DESCRIPTION("AGP GART driver");
361MODULE_LICENSE("GPL and additional rights");
362MODULE_ALIAS_MISCDEV(AGPGART_MINOR);
363
364module_init(agp_init);
365module_exit(agp_exit);
366