backend.c 8.87 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
/*
 * AGPGART driver backend routines.
 * Copyright (C) 2004 Silicon Graphics, Inc.
 * Copyright (C) 2002-2003 Dave Jones.
 * Copyright (C) 1999 Jeff Hartmann.
 * Copyright (C) 1999 Precision Insight, Inc.
 * Copyright (C) 1999 Xi Graphics, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * JEFF HARTMANN, DAVE JONES, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * TODO:
 * - Allocate more than order 0 pages to avoid too much linear map splitting.
 */
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
33
#include <linux/slab.h>
Linus Torvalds's avatar
Linus Torvalds committed
34
35
36
37
38
39
40
41
42
43
44
45
46
#include <linux/pagemap.h>
#include <linux/miscdevice.h>
#include <linux/pm.h>
#include <linux/agp_backend.h>
#include <linux/agpgart.h>
#include <linux/vmalloc.h>
#include <asm/io.h>
#include "agp.h"

/* Due to XFree86 brain-damage, we can't go to 1.0 until they
 * fix some real stupidity. It's only by chance we can bump
 * past 0.99 at all due to some boolean logic error. */
#define AGPGART_VERSION_MAJOR 0
47
#define AGPGART_VERSION_MINOR 103
48
static const struct agp_version agp_current_version =
Linus Torvalds's avatar
Linus Torvalds committed
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
{
	.major = AGPGART_VERSION_MAJOR,
	.minor = AGPGART_VERSION_MINOR,
};

struct agp_bridge_data *(*agp_find_bridge)(struct pci_dev *) =
	&agp_generic_find_bridge;

struct agp_bridge_data *agp_bridge;
LIST_HEAD(agp_bridges);
EXPORT_SYMBOL(agp_bridge);
EXPORT_SYMBOL(agp_bridges);
EXPORT_SYMBOL(agp_find_bridge);

/**
 *	agp_backend_acquire  -  attempt to acquire an agp backend.
 *
 */
struct agp_bridge_data *agp_backend_acquire(struct pci_dev *pdev)
{
	struct agp_bridge_data *bridge;

	bridge = agp_find_bridge(pdev);

	if (!bridge)
		return NULL;

	if (atomic_read(&bridge->agp_in_use))
		return NULL;
	atomic_inc(&bridge->agp_in_use);
	return bridge;
}
EXPORT_SYMBOL(agp_backend_acquire);


/**
 *	agp_backend_release  -  release the lock on the agp backend.
 *
 *	The caller must insure that the graphics aperture translation table
 *	is read for use by another entity.
 *
 *	(Ensure that all memory it bound is unbound.)
 */
void agp_backend_release(struct agp_bridge_data *bridge)
{

	if (bridge)
		atomic_dec(&bridge->agp_in_use);
}
EXPORT_SYMBOL(agp_backend_release);


101
static const struct { int mem, agp; } maxes_table[] = {
Linus Torvalds's avatar
Linus Torvalds committed
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
	{0, 0},
	{32, 4},
	{64, 28},
	{128, 96},
	{256, 204},
	{512, 440},
	{1024, 942},
	{2048, 1920},
	{4096, 3932}
};

static int agp_find_max(void)
{
	long memory, index, result;

#if PAGE_SHIFT < 20
118
	memory = totalram_pages() >> (20 - PAGE_SHIFT);
Linus Torvalds's avatar
Linus Torvalds committed
119
#else
120
	memory = totalram_pages() << (PAGE_SHIFT - 20);
Linus Torvalds's avatar
Linus Torvalds committed
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
#endif
	index = 1;

	while ((memory > maxes_table[index].mem) && (index < 8))
		index++;

	result = maxes_table[index - 1].agp +
	   ( (memory - maxes_table[index - 1].mem)  *
	     (maxes_table[index].agp - maxes_table[index - 1].agp)) /
	   (maxes_table[index].mem - maxes_table[index - 1].mem);

	result = result << (20 - PAGE_SHIFT);
	return result;
}


static int agp_backend_initialize(struct agp_bridge_data *bridge)
{
	int size_value, rc, got_gatt=0, got_keylist=0;

	bridge->max_memory_agp = agp_find_max();
	bridge->version = &agp_current_version;

	if (bridge->driver->needs_scratch_page) {
145
		struct page *page = bridge->driver->agp_alloc_page(bridge);
Linus Torvalds's avatar
Linus Torvalds committed
146

147
		if (!page) {
148
149
			dev_err(&bridge->dev->dev,
				"can't get memory for scratch page\n");
Linus Torvalds's avatar
Linus Torvalds committed
150
151
152
			return -ENOMEM;
		}

153
		bridge->scratch_page_page = page;
Daniel Vetter's avatar
Daniel Vetter committed
154
		bridge->scratch_page_dma = page_to_phys(page);
155
156
157

		bridge->scratch_page = bridge->driver->mask_memory(bridge,
						   bridge->scratch_page_dma, 0);
Linus Torvalds's avatar
Linus Torvalds committed
158
159
160
161
	}

	size_value = bridge->driver->fetch_size();
	if (size_value == 0) {
162
		dev_err(&bridge->dev->dev, "can't determine aperture size\n");
Linus Torvalds's avatar
Linus Torvalds committed
163
164
165
166
		rc = -EINVAL;
		goto err_out;
	}
	if (bridge->driver->create_gatt_table(bridge)) {
167
168
		dev_err(&bridge->dev->dev,
			"can't get memory for graphics translation table\n");
Linus Torvalds's avatar
Linus Torvalds committed
169
170
171
172
173
		rc = -ENOMEM;
		goto err_out;
	}
	got_gatt = 1;

174
	bridge->key_list = vzalloc(PAGE_SIZE * 4);
Linus Torvalds's avatar
Linus Torvalds committed
175
	if (bridge->key_list == NULL) {
176
177
		dev_err(&bridge->dev->dev,
			"can't allocate memory for key lists\n");
Linus Torvalds's avatar
Linus Torvalds committed
178
179
180
181
182
183
184
185
		rc = -ENOMEM;
		goto err_out;
	}
	got_keylist = 1;

	/* FIXME vmalloc'd memory not guaranteed contiguous */

	if (bridge->driver->configure()) {
186
		dev_err(&bridge->dev->dev, "error configuring host chipset\n");
Linus Torvalds's avatar
Linus Torvalds committed
187
188
189
		rc = -EINVAL;
		goto err_out;
	}
190
191
	INIT_LIST_HEAD(&bridge->mapped_list);
	spin_lock_init(&bridge->mapped_lock);
Linus Torvalds's avatar
Linus Torvalds committed
192
193
194
195

	return 0;

err_out:
Alan Hourihane's avatar
Alan Hourihane committed
196
	if (bridge->driver->needs_scratch_page) {
Michal Kubecek's avatar
Michal Kubecek committed
197
		struct page *page = bridge->scratch_page_page;
198

Michal Kubecek's avatar
Michal Kubecek committed
199
200
		bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_UNMAP);
		bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_FREE);
Alan Hourihane's avatar
Alan Hourihane committed
201
	}
Linus Torvalds's avatar
Linus Torvalds committed
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
	if (got_gatt)
		bridge->driver->free_gatt_table(bridge);
	if (got_keylist) {
		vfree(bridge->key_list);
		bridge->key_list = NULL;
	}
	return rc;
}

/* cannot be __exit b/c as it could be called from __init code */
static void agp_backend_cleanup(struct agp_bridge_data *bridge)
{
	if (bridge->driver->cleanup)
		bridge->driver->cleanup();
	if (bridge->driver->free_gatt_table)
		bridge->driver->free_gatt_table(bridge);
218
219
220

	vfree(bridge->key_list);
	bridge->key_list = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
221
222

	if (bridge->driver->agp_destroy_page &&
Alan Hourihane's avatar
Alan Hourihane committed
223
	    bridge->driver->needs_scratch_page) {
Michal Kubecek's avatar
Michal Kubecek committed
224
		struct page *page = bridge->scratch_page_page;
225

Michal Kubecek's avatar
Michal Kubecek committed
226
227
		bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_UNMAP);
		bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_FREE);
Alan Hourihane's avatar
Alan Hourihane committed
228
	}
Linus Torvalds's avatar
Linus Torvalds committed
229
230
231
232
233
234
235
236
}

/* When we remove the global variable agp_bridge from all drivers
 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
 */

struct agp_bridge_data *agp_alloc_bridge(void)
{
237
	struct agp_bridge_data *bridge;
238

239
	bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
Linus Torvalds's avatar
Linus Torvalds committed
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
	if (!bridge)
		return NULL;

	atomic_set(&bridge->agp_in_use, 0);
	atomic_set(&bridge->current_memory_agp, 0);

	if (list_empty(&agp_bridges))
		agp_bridge = bridge;

	return bridge;
}
EXPORT_SYMBOL(agp_alloc_bridge);


void agp_put_bridge(struct agp_bridge_data *bridge)
{
        kfree(bridge);

        if (list_empty(&agp_bridges))
                agp_bridge = NULL;
}
EXPORT_SYMBOL(agp_put_bridge);


int agp_add_bridge(struct agp_bridge_data *bridge)
{
	int error;

268
269
270
271
	if (agp_off) {
		error = -ENODEV;
		goto err_put_bridge;
	}
Linus Torvalds's avatar
Linus Torvalds committed
272
273
274

	if (!bridge->dev) {
		printk (KERN_DEBUG PFX "Erk, registering with no pci_dev!\n");
275
276
		error = -EINVAL;
		goto err_put_bridge;
Linus Torvalds's avatar
Linus Torvalds committed
277
278
279
280
	}

	/* Grab reference on the chipset driver. */
	if (!try_module_get(bridge->driver->owner)) {
281
		dev_info(&bridge->dev->dev, "can't lock chipset driver\n");
282
283
		error = -EINVAL;
		goto err_put_bridge;
Linus Torvalds's avatar
Linus Torvalds committed
284
285
286
287
	}

	error = agp_backend_initialize(bridge);
	if (error) {
288
289
		dev_info(&bridge->dev->dev,
			 "agp_backend_initialize() failed\n");
Linus Torvalds's avatar
Linus Torvalds committed
290
291
292
293
294
295
		goto err_out;
	}

	if (list_empty(&agp_bridges)) {
		error = agp_frontend_initialize();
		if (error) {
296
297
			dev_info(&bridge->dev->dev,
				 "agp_frontend_initialize() failed\n");
Linus Torvalds's avatar
Linus Torvalds committed
298
299
300
			goto frontend_err;
		}

301
302
		dev_info(&bridge->dev->dev, "AGP aperture is %dM @ 0x%lx\n",
			 bridge->driver->fetch_size(), bridge->gart_bus_addr);
Linus Torvalds's avatar
Linus Torvalds committed
303
304
305
306
307
308
309
310
311
312

	}

	list_add(&bridge->list, &agp_bridges);
	return 0;

frontend_err:
	agp_backend_cleanup(bridge);
err_out:
	module_put(bridge->driver->owner);
313
err_put_bridge:
Linus Torvalds's avatar
Linus Torvalds committed
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
	agp_put_bridge(bridge);
	return error;
}
EXPORT_SYMBOL_GPL(agp_add_bridge);


void agp_remove_bridge(struct agp_bridge_data *bridge)
{
	agp_backend_cleanup(bridge);
	list_del(&bridge->list);
	if (list_empty(&agp_bridges))
		agp_frontend_cleanup();
	module_put(bridge->driver->owner);
}
EXPORT_SYMBOL_GPL(agp_remove_bridge);

int agp_off;
int agp_try_unsupported_boot;
EXPORT_SYMBOL(agp_off);
EXPORT_SYMBOL(agp_try_unsupported_boot);

static int __init agp_init(void)
{
	if (!agp_off)
338
		printk(KERN_INFO "Linux agpgart interface v%d.%d\n",
Linus Torvalds's avatar
Linus Torvalds committed
339
340
341
342
			AGPGART_VERSION_MAJOR, AGPGART_VERSION_MINOR);
	return 0;
}

343
static void __exit agp_exit(void)
Linus Torvalds's avatar
Linus Torvalds committed
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
{
}

#ifndef MODULE
static __init int agp_setup(char *s)
{
	if (!strcmp(s,"off"))
		agp_off = 1;
	if (!strcmp(s,"try_unsupported"))
		agp_try_unsupported_boot = 1;
	return 1;
}
__setup("agp=", agp_setup);
#endif

359
MODULE_AUTHOR("Dave Jones, Jeff Hartmann");
Linus Torvalds's avatar
Linus Torvalds committed
360
361
362
363
364
365
366
MODULE_DESCRIPTION("AGP GART driver");
MODULE_LICENSE("GPL and additional rights");
MODULE_ALIAS_MISCDEV(AGPGART_MINOR);

module_init(agp_init);
module_exit(agp_exit);