1 /*
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>
33 #include <linux/slab.h>
34 #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
47 #define AGPGART_VERSION_MINOR 103
48 static const struct agp_version agp_current_version =
49 {
50 .major = AGPGART_VERSION_MAJOR,
51 .minor = AGPGART_VERSION_MINOR,
52 };
53
54 struct agp_bridge_data *(*agp_find_bridge)(struct pci_dev *) =
55 &agp_generic_find_bridge;
56
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);
62
63 /**
64 * agp_backend_acquire - attempt to acquire an agp backend.
65 *
66 */
agp_backend_acquire(struct pci_dev * pdev)67 struct 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 }
81 EXPORT_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 */
agp_backend_release(struct agp_bridge_data * bridge)92 void agp_backend_release(struct agp_bridge_data *bridge)
93 {
94
95 if (bridge)
96 atomic_dec(&bridge->agp_in_use);
97 }
98 EXPORT_SYMBOL(agp_backend_release);
99
100
101 static const struct { int mem, agp; } maxes_table[] = {
102 {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
agp_find_max(void)113 static int agp_find_max(void)
114 {
115 long memory, index, result;
116
117 #if PAGE_SHIFT < 20
118 memory = totalram_pages >> (20 - PAGE_SHIFT);
119 #else
120 memory = totalram_pages << (PAGE_SHIFT - 20);
121 #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
agp_backend_initialize(struct agp_bridge_data * bridge)137 static 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) {
145 struct page *page = bridge->driver->agp_alloc_page(bridge);
146
147 if (!page) {
148 dev_err(&bridge->dev->dev,
149 "can't get memory for scratch page\n");
150 return -ENOMEM;
151 }
152
153 bridge->scratch_page_page = page;
154 bridge->scratch_page_dma = page_to_phys(page);
155
156 bridge->scratch_page = bridge->driver->mask_memory(bridge,
157 bridge->scratch_page_dma, 0);
158 }
159
160 size_value = bridge->driver->fetch_size();
161 if (size_value == 0) {
162 dev_err(&bridge->dev->dev, "can't determine aperture size\n");
163 rc = -EINVAL;
164 goto err_out;
165 }
166 if (bridge->driver->create_gatt_table(bridge)) {
167 dev_err(&bridge->dev->dev,
168 "can't get memory for graphics translation table\n");
169 rc = -ENOMEM;
170 goto err_out;
171 }
172 got_gatt = 1;
173
174 bridge->key_list = vmalloc(PAGE_SIZE * 4);
175 if (bridge->key_list == NULL) {
176 dev_err(&bridge->dev->dev,
177 "can't allocate memory for key lists\n");
178 rc = -ENOMEM;
179 goto err_out;
180 }
181 got_keylist = 1;
182
183 /* FIXME vmalloc'd memory not guaranteed contiguous */
184 memset(bridge->key_list, 0, PAGE_SIZE * 4);
185
186 if (bridge->driver->configure()) {
187 dev_err(&bridge->dev->dev, "error configuring host chipset\n");
188 rc = -EINVAL;
189 goto err_out;
190 }
191 INIT_LIST_HEAD(&bridge->mapped_list);
192 spin_lock_init(&bridge->mapped_lock);
193
194 return 0;
195
196 err_out:
197 if (bridge->driver->needs_scratch_page) {
198 void *va = page_address(bridge->scratch_page_page);
199
200 bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_UNMAP);
201 bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_FREE);
202 }
203 if (got_gatt)
204 bridge->driver->free_gatt_table(bridge);
205 if (got_keylist) {
206 vfree(bridge->key_list);
207 bridge->key_list = NULL;
208 }
209 return rc;
210 }
211
212 /* cannot be __exit b/c as it could be called from __init code */
agp_backend_cleanup(struct agp_bridge_data * bridge)213 static void agp_backend_cleanup(struct agp_bridge_data *bridge)
214 {
215 if (bridge->driver->cleanup)
216 bridge->driver->cleanup();
217 if (bridge->driver->free_gatt_table)
218 bridge->driver->free_gatt_table(bridge);
219
220 vfree(bridge->key_list);
221 bridge->key_list = NULL;
222
223 if (bridge->driver->agp_destroy_page &&
224 bridge->driver->needs_scratch_page) {
225 void *va = page_address(bridge->scratch_page_page);
226
227 bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_UNMAP);
228 bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_FREE);
229 }
230 }
231
232 /* When we remove the global variable agp_bridge from all drivers
233 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
234 */
235
agp_alloc_bridge(void)236 struct agp_bridge_data *agp_alloc_bridge(void)
237 {
238 struct agp_bridge_data *bridge;
239
240 bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
241 if (!bridge)
242 return NULL;
243
244 atomic_set(&bridge->agp_in_use, 0);
245 atomic_set(&bridge->current_memory_agp, 0);
246
247 if (list_empty(&agp_bridges))
248 agp_bridge = bridge;
249
250 return bridge;
251 }
252 EXPORT_SYMBOL(agp_alloc_bridge);
253
254
agp_put_bridge(struct agp_bridge_data * bridge)255 void agp_put_bridge(struct agp_bridge_data *bridge)
256 {
257 kfree(bridge);
258
259 if (list_empty(&agp_bridges))
260 agp_bridge = NULL;
261 }
262 EXPORT_SYMBOL(agp_put_bridge);
263
264
agp_add_bridge(struct agp_bridge_data * bridge)265 int agp_add_bridge(struct agp_bridge_data *bridge)
266 {
267 int error;
268
269 if (agp_off) {
270 error = -ENODEV;
271 goto err_put_bridge;
272 }
273
274 if (!bridge->dev) {
275 printk (KERN_DEBUG PFX "Erk, registering with no pci_dev!\n");
276 error = -EINVAL;
277 goto err_put_bridge;
278 }
279
280 /* Grab reference on the chipset driver. */
281 if (!try_module_get(bridge->driver->owner)) {
282 dev_info(&bridge->dev->dev, "can't lock chipset driver\n");
283 error = -EINVAL;
284 goto err_put_bridge;
285 }
286
287 error = agp_backend_initialize(bridge);
288 if (error) {
289 dev_info(&bridge->dev->dev,
290 "agp_backend_initialize() failed\n");
291 goto err_out;
292 }
293
294 if (list_empty(&agp_bridges)) {
295 error = agp_frontend_initialize();
296 if (error) {
297 dev_info(&bridge->dev->dev,
298 "agp_frontend_initialize() failed\n");
299 goto frontend_err;
300 }
301
302 dev_info(&bridge->dev->dev, "AGP aperture is %dM @ 0x%lx\n",
303 bridge->driver->fetch_size(), bridge->gart_bus_addr);
304
305 }
306
307 list_add(&bridge->list, &agp_bridges);
308 return 0;
309
310 frontend_err:
311 agp_backend_cleanup(bridge);
312 err_out:
313 module_put(bridge->driver->owner);
314 err_put_bridge:
315 agp_put_bridge(bridge);
316 return error;
317 }
318 EXPORT_SYMBOL_GPL(agp_add_bridge);
319
320
agp_remove_bridge(struct agp_bridge_data * bridge)321 void agp_remove_bridge(struct agp_bridge_data *bridge)
322 {
323 agp_backend_cleanup(bridge);
324 list_del(&bridge->list);
325 if (list_empty(&agp_bridges))
326 agp_frontend_cleanup();
327 module_put(bridge->driver->owner);
328 }
329 EXPORT_SYMBOL_GPL(agp_remove_bridge);
330
331 int agp_off;
332 int agp_try_unsupported_boot;
333 EXPORT_SYMBOL(agp_off);
334 EXPORT_SYMBOL(agp_try_unsupported_boot);
335
agp_init(void)336 static int __init agp_init(void)
337 {
338 if (!agp_off)
339 printk(KERN_INFO "Linux agpgart interface v%d.%d\n",
340 AGPGART_VERSION_MAJOR, AGPGART_VERSION_MINOR);
341 return 0;
342 }
343
agp_exit(void)344 static void __exit agp_exit(void)
345 {
346 }
347
348 #ifndef MODULE
agp_setup(char * s)349 static __init int agp_setup(char *s)
350 {
351 if (!strcmp(s,"off"))
352 agp_off = 1;
353 if (!strcmp(s,"try_unsupported"))
354 agp_try_unsupported_boot = 1;
355 return 1;
356 }
357 __setup("agp=", agp_setup);
358 #endif
359
360 MODULE_AUTHOR("Dave Jones <davej@redhat.com>");
361 MODULE_DESCRIPTION("AGP GART driver");
362 MODULE_LICENSE("GPL and additional rights");
363 MODULE_ALIAS_MISCDEV(AGPGART_MINOR);
364
365 module_init(agp_init);
366 module_exit(agp_exit);
367
368