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1da177e4 LT |
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/pagemap.h> | |
34 | #include <linux/miscdevice.h> | |
35 | #include <linux/pm.h> | |
36 | #include <linux/agp_backend.h> | |
37 | #include <linux/agpgart.h> | |
38 | #include <linux/vmalloc.h> | |
39 | #include <asm/io.h> | |
40 | #include "agp.h" | |
41 | ||
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 101 | |
47 | static struct agp_version agp_current_version = | |
48 | { | |
49 | .major = AGPGART_VERSION_MAJOR, | |
50 | .minor = AGPGART_VERSION_MINOR, | |
51 | }; | |
52 | ||
53 | struct agp_bridge_data *(*agp_find_bridge)(struct pci_dev *) = | |
54 | &agp_generic_find_bridge; | |
55 | ||
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); | |
61 | ||
62 | /** | |
63 | * agp_backend_acquire - attempt to acquire an agp backend. | |
64 | * | |
65 | */ | |
66 | struct agp_bridge_data *agp_backend_acquire(struct pci_dev *pdev) | |
67 | { | |
68 | struct agp_bridge_data *bridge; | |
69 | ||
70 | bridge = agp_find_bridge(pdev); | |
71 | ||
72 | if (!bridge) | |
73 | return NULL; | |
74 | ||
75 | if (atomic_read(&bridge->agp_in_use)) | |
76 | return NULL; | |
77 | atomic_inc(&bridge->agp_in_use); | |
78 | return bridge; | |
79 | } | |
80 | EXPORT_SYMBOL(agp_backend_acquire); | |
81 | ||
82 | ||
83 | /** | |
84 | * agp_backend_release - release the lock on the agp backend. | |
85 | * | |
86 | * The caller must insure that the graphics aperture translation table | |
87 | * is read for use by another entity. | |
88 | * | |
89 | * (Ensure that all memory it bound is unbound.) | |
90 | */ | |
91 | void agp_backend_release(struct agp_bridge_data *bridge) | |
92 | { | |
93 | ||
94 | if (bridge) | |
95 | atomic_dec(&bridge->agp_in_use); | |
96 | } | |
97 | EXPORT_SYMBOL(agp_backend_release); | |
98 | ||
99 | ||
408b664a | 100 | static struct { int mem, agp; } maxes_table[] = { |
1da177e4 LT |
101 | {0, 0}, |
102 | {32, 4}, | |
103 | {64, 28}, | |
104 | {128, 96}, | |
105 | {256, 204}, | |
106 | {512, 440}, | |
107 | {1024, 942}, | |
108 | {2048, 1920}, | |
109 | {4096, 3932} | |
110 | }; | |
111 | ||
112 | static int agp_find_max(void) | |
113 | { | |
114 | long memory, index, result; | |
115 | ||
116 | #if PAGE_SHIFT < 20 | |
117 | memory = num_physpages >> (20 - PAGE_SHIFT); | |
118 | #else | |
119 | memory = num_physpages << (PAGE_SHIFT - 20); | |
120 | #endif | |
121 | index = 1; | |
122 | ||
123 | while ((memory > maxes_table[index].mem) && (index < 8)) | |
124 | index++; | |
125 | ||
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); | |
130 | ||
131 | result = result << (20 - PAGE_SHIFT); | |
132 | return result; | |
133 | } | |
134 | ||
135 | ||
136 | static int agp_backend_initialize(struct agp_bridge_data *bridge) | |
137 | { | |
138 | int size_value, rc, got_gatt=0, got_keylist=0; | |
139 | ||
140 | bridge->max_memory_agp = agp_find_max(); | |
141 | bridge->version = &agp_current_version; | |
142 | ||
143 | if (bridge->driver->needs_scratch_page) { | |
144 | void *addr = bridge->driver->agp_alloc_page(bridge); | |
145 | ||
146 | if (!addr) { | |
147 | printk(KERN_ERR PFX "unable to get memory for scratch page.\n"); | |
148 | return -ENOMEM; | |
149 | } | |
150 | ||
151 | bridge->scratch_page_real = virt_to_phys(addr); | |
152 | bridge->scratch_page = | |
153 | bridge->driver->mask_memory(bridge, bridge->scratch_page_real, 0); | |
154 | } | |
155 | ||
156 | size_value = bridge->driver->fetch_size(); | |
157 | if (size_value == 0) { | |
158 | printk(KERN_ERR PFX "unable to determine aperture size.\n"); | |
159 | rc = -EINVAL; | |
160 | goto err_out; | |
161 | } | |
162 | if (bridge->driver->create_gatt_table(bridge)) { | |
163 | printk(KERN_ERR PFX | |
164 | "unable to get memory for graphics translation table.\n"); | |
165 | rc = -ENOMEM; | |
166 | goto err_out; | |
167 | } | |
168 | got_gatt = 1; | |
169 | ||
170 | bridge->key_list = vmalloc(PAGE_SIZE * 4); | |
171 | if (bridge->key_list == NULL) { | |
172 | printk(KERN_ERR PFX "error allocating memory for key lists.\n"); | |
173 | rc = -ENOMEM; | |
174 | goto err_out; | |
175 | } | |
176 | got_keylist = 1; | |
177 | ||
178 | /* FIXME vmalloc'd memory not guaranteed contiguous */ | |
179 | memset(bridge->key_list, 0, PAGE_SIZE * 4); | |
180 | ||
181 | if (bridge->driver->configure()) { | |
182 | printk(KERN_ERR PFX "error configuring host chipset.\n"); | |
183 | rc = -EINVAL; | |
184 | goto err_out; | |
185 | } | |
186 | ||
187 | return 0; | |
188 | ||
189 | err_out: | |
190 | if (bridge->driver->needs_scratch_page) | |
191 | bridge->driver->agp_destroy_page( | |
192 | phys_to_virt(bridge->scratch_page_real)); | |
193 | if (got_gatt) | |
194 | bridge->driver->free_gatt_table(bridge); | |
195 | if (got_keylist) { | |
196 | vfree(bridge->key_list); | |
197 | bridge->key_list = NULL; | |
198 | } | |
199 | return rc; | |
200 | } | |
201 | ||
202 | /* cannot be __exit b/c as it could be called from __init code */ | |
203 | static void agp_backend_cleanup(struct agp_bridge_data *bridge) | |
204 | { | |
205 | if (bridge->driver->cleanup) | |
206 | bridge->driver->cleanup(); | |
207 | if (bridge->driver->free_gatt_table) | |
208 | bridge->driver->free_gatt_table(bridge); | |
209 | if (bridge->key_list) { | |
210 | vfree(bridge->key_list); | |
211 | bridge->key_list = NULL; | |
212 | } | |
213 | ||
214 | if (bridge->driver->agp_destroy_page && | |
215 | bridge->driver->needs_scratch_page) | |
216 | bridge->driver->agp_destroy_page( | |
217 | phys_to_virt(bridge->scratch_page_real)); | |
218 | } | |
219 | ||
220 | /* When we remove the global variable agp_bridge from all drivers | |
221 | * then agp_alloc_bridge and agp_generic_find_bridge need to be updated | |
222 | */ | |
223 | ||
224 | struct agp_bridge_data *agp_alloc_bridge(void) | |
225 | { | |
226 | struct agp_bridge_data *bridge = kmalloc(sizeof(*bridge), GFP_KERNEL); | |
227 | ||
228 | if (!bridge) | |
229 | return NULL; | |
230 | ||
231 | memset(bridge, 0, sizeof(*bridge)); | |
232 | atomic_set(&bridge->agp_in_use, 0); | |
233 | atomic_set(&bridge->current_memory_agp, 0); | |
234 | ||
235 | if (list_empty(&agp_bridges)) | |
236 | agp_bridge = bridge; | |
237 | ||
238 | return bridge; | |
239 | } | |
240 | EXPORT_SYMBOL(agp_alloc_bridge); | |
241 | ||
242 | ||
243 | void agp_put_bridge(struct agp_bridge_data *bridge) | |
244 | { | |
245 | kfree(bridge); | |
246 | ||
247 | if (list_empty(&agp_bridges)) | |
248 | agp_bridge = NULL; | |
249 | } | |
250 | EXPORT_SYMBOL(agp_put_bridge); | |
251 | ||
252 | ||
253 | int agp_add_bridge(struct agp_bridge_data *bridge) | |
254 | { | |
255 | int error; | |
256 | ||
257 | if (agp_off) | |
258 | return -ENODEV; | |
259 | ||
260 | if (!bridge->dev) { | |
261 | printk (KERN_DEBUG PFX "Erk, registering with no pci_dev!\n"); | |
262 | return -EINVAL; | |
263 | } | |
264 | ||
265 | /* Grab reference on the chipset driver. */ | |
266 | if (!try_module_get(bridge->driver->owner)) { | |
267 | printk (KERN_INFO PFX "Couldn't lock chipset driver.\n"); | |
268 | return -EINVAL; | |
269 | } | |
270 | ||
271 | error = agp_backend_initialize(bridge); | |
272 | if (error) { | |
273 | printk (KERN_INFO PFX "agp_backend_initialize() failed.\n"); | |
274 | goto err_out; | |
275 | } | |
276 | ||
277 | if (list_empty(&agp_bridges)) { | |
278 | error = agp_frontend_initialize(); | |
279 | if (error) { | |
280 | printk (KERN_INFO PFX "agp_frontend_initialize() failed.\n"); | |
281 | goto frontend_err; | |
282 | } | |
283 | ||
284 | printk(KERN_INFO PFX "AGP aperture is %dM @ 0x%lx\n", | |
285 | bridge->driver->fetch_size(), bridge->gart_bus_addr); | |
286 | ||
287 | } | |
288 | ||
289 | list_add(&bridge->list, &agp_bridges); | |
290 | return 0; | |
291 | ||
292 | frontend_err: | |
293 | agp_backend_cleanup(bridge); | |
294 | err_out: | |
295 | module_put(bridge->driver->owner); | |
296 | agp_put_bridge(bridge); | |
297 | return error; | |
298 | } | |
299 | EXPORT_SYMBOL_GPL(agp_add_bridge); | |
300 | ||
301 | ||
302 | void agp_remove_bridge(struct agp_bridge_data *bridge) | |
303 | { | |
304 | agp_backend_cleanup(bridge); | |
305 | list_del(&bridge->list); | |
306 | if (list_empty(&agp_bridges)) | |
307 | agp_frontend_cleanup(); | |
308 | module_put(bridge->driver->owner); | |
309 | } | |
310 | EXPORT_SYMBOL_GPL(agp_remove_bridge); | |
311 | ||
312 | int agp_off; | |
313 | int agp_try_unsupported_boot; | |
314 | EXPORT_SYMBOL(agp_off); | |
315 | EXPORT_SYMBOL(agp_try_unsupported_boot); | |
316 | ||
317 | static int __init agp_init(void) | |
318 | { | |
319 | if (!agp_off) | |
320 | printk(KERN_INFO "Linux agpgart interface v%d.%d (c) Dave Jones\n", | |
321 | AGPGART_VERSION_MAJOR, AGPGART_VERSION_MINOR); | |
322 | return 0; | |
323 | } | |
324 | ||
408b664a | 325 | static void __exit agp_exit(void) |
1da177e4 LT |
326 | { |
327 | } | |
328 | ||
329 | #ifndef MODULE | |
330 | static __init int agp_setup(char *s) | |
331 | { | |
332 | if (!strcmp(s,"off")) | |
333 | agp_off = 1; | |
334 | if (!strcmp(s,"try_unsupported")) | |
335 | agp_try_unsupported_boot = 1; | |
336 | return 1; | |
337 | } | |
338 | __setup("agp=", agp_setup); | |
339 | #endif | |
340 | ||
341 | MODULE_AUTHOR("Dave Jones <davej@codemonkey.org.uk>"); | |
342 | MODULE_DESCRIPTION("AGP GART driver"); | |
343 | MODULE_LICENSE("GPL and additional rights"); | |
344 | MODULE_ALIAS_MISCDEV(AGPGART_MINOR); | |
345 | ||
346 | module_init(agp_init); | |
347 | module_exit(agp_exit); | |
348 |