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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/char/agp/backend.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/char/agp/backend.c')
-rw-r--r--drivers/char/agp/backend.c348
1 files changed, 348 insertions, 0 deletions
diff --git a/drivers/char/agp/backend.c b/drivers/char/agp/backend.c
new file mode 100644
index 000000000000..c3442f3c6480
--- /dev/null
+++ b/drivers/char/agp/backend.c
@@ -0,0 +1,348 @@
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
47static struct agp_version agp_current_version =
48{
49 .major = AGPGART_VERSION_MAJOR,
50 .minor = AGPGART_VERSION_MINOR,
51};
52
53struct agp_bridge_data *(*agp_find_bridge)(struct pci_dev *) =
54 &agp_generic_find_bridge;
55
56struct agp_bridge_data *agp_bridge;
57LIST_HEAD(agp_bridges);
58EXPORT_SYMBOL(agp_bridge);
59EXPORT_SYMBOL(agp_bridges);
60EXPORT_SYMBOL(agp_find_bridge);
61
62/**
63 * agp_backend_acquire - attempt to acquire an agp backend.
64 *
65 */
66struct 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}
80EXPORT_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 */
91void agp_backend_release(struct agp_bridge_data *bridge)
92{
93
94 if (bridge)
95 atomic_dec(&bridge->agp_in_use);
96}
97EXPORT_SYMBOL(agp_backend_release);
98
99
100struct { int mem, agp; } maxes_table[] = {
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
112static 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
136static 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
189err_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 */
203static 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
224struct 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}
240EXPORT_SYMBOL(agp_alloc_bridge);
241
242
243void agp_put_bridge(struct agp_bridge_data *bridge)
244{
245 kfree(bridge);
246
247 if (list_empty(&agp_bridges))
248 agp_bridge = NULL;
249}
250EXPORT_SYMBOL(agp_put_bridge);
251
252
253int 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
292frontend_err:
293 agp_backend_cleanup(bridge);
294err_out:
295 module_put(bridge->driver->owner);
296 agp_put_bridge(bridge);
297 return error;
298}
299EXPORT_SYMBOL_GPL(agp_add_bridge);
300
301
302void 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}
310EXPORT_SYMBOL_GPL(agp_remove_bridge);
311
312int agp_off;
313int agp_try_unsupported_boot;
314EXPORT_SYMBOL(agp_off);
315EXPORT_SYMBOL(agp_try_unsupported_boot);
316
317static 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
325void __exit agp_exit(void)
326{
327}
328
329#ifndef MODULE
330static __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
341MODULE_AUTHOR("Dave Jones <davej@codemonkey.org.uk>");
342MODULE_DESCRIPTION("AGP GART driver");
343MODULE_LICENSE("GPL and additional rights");
344MODULE_ALIAS_MISCDEV(AGPGART_MINOR);
345
346module_init(agp_init);
347module_exit(agp_exit);
348