[linux-block.git] / drivers / char / agp / backend.c

/*
 * 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>
#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
#define AGPGART_VERSION_MINOR 102
static const struct agp_version agp_current_version =
{
	.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);


static const struct { int mem, agp; } maxes_table[] = {
	{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
	memory = num_physpages >> (20 - PAGE_SHIFT);
#else
	memory = num_physpages << (PAGE_SHIFT - 20);
#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) {
		void *addr = bridge->driver->agp_alloc_page(bridge);

		if (!addr) {
			printk(KERN_ERR PFX "unable to get memory for scratch page.\n");
			return -ENOMEM;
		}
		flush_agp_mappings();

		bridge->scratch_page_real = virt_to_gart(addr);
		bridge->scratch_page =
		    bridge->driver->mask_memory(bridge, bridge->scratch_page_real, 0);
	}

	size_value = bridge->driver->fetch_size();
	if (size_value == 0) {
		printk(KERN_ERR PFX "unable to determine aperture size.\n");
		rc = -EINVAL;
		goto err_out;
	}
	if (bridge->driver->create_gatt_table(bridge)) {
		printk(KERN_ERR PFX
		    "unable to get memory for graphics translation table.\n");
		rc = -ENOMEM;
		goto err_out;
	}
	got_gatt = 1;

	bridge->key_list = vmalloc(PAGE_SIZE * 4);
	if (bridge->key_list == NULL) {
		printk(KERN_ERR PFX "error allocating memory for key lists.\n");
		rc = -ENOMEM;
		goto err_out;
	}
	got_keylist = 1;

	/* FIXME vmalloc'd memory not guaranteed contiguous */
	memset(bridge->key_list, 0, PAGE_SIZE * 4);

	if (bridge->driver->configure()) {
		printk(KERN_ERR PFX "error configuring host chipset.\n");
		rc = -EINVAL;
		goto err_out;
	}

	return 0;

err_out:
	if (bridge->driver->needs_scratch_page) {
		bridge->driver->agp_destroy_page(
				gart_to_virt(bridge->scratch_page_real));
		flush_agp_mappings();
	}
	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);

	vfree(bridge->key_list);
	bridge->key_list = NULL;

	if (bridge->driver->agp_destroy_page &&
	    bridge->driver->needs_scratch_page) {
		bridge->driver->agp_destroy_page(
				gart_to_virt(bridge->scratch_page_real));
		flush_agp_mappings();
	}
}

/* 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)
{
	struct agp_bridge_data *bridge;

	bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
	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;

	if (agp_off)
		return -ENODEV;

	if (!bridge->dev) {
		printk (KERN_DEBUG PFX "Erk, registering with no pci_dev!\n");
		return -EINVAL;
	}

	/* Grab reference on the chipset driver. */
	if (!try_module_get(bridge->driver->owner)) {
		printk (KERN_INFO PFX "Couldn't lock chipset driver.\n");
		return -EINVAL;
	}

	error = agp_backend_initialize(bridge);
	if (error) {
		printk (KERN_INFO PFX "agp_backend_initialize() failed.\n");
		goto err_out;
	}

	if (list_empty(&agp_bridges)) {
		error = agp_frontend_initialize();
		if (error) {
			printk (KERN_INFO PFX "agp_frontend_initialize() failed.\n");
			goto frontend_err;
		}

		printk(KERN_INFO PFX "AGP aperture is %dM @ 0x%lx\n",
			bridge->driver->fetch_size(), bridge->gart_bus_addr);

	}

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

frontend_err:
	agp_backend_cleanup(bridge);
err_out:
	module_put(bridge->driver->owner);
	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)
		printk(KERN_INFO "Linux agpgart interface v%d.%d\n",
			AGPGART_VERSION_MAJOR, AGPGART_VERSION_MINOR);
	return 0;
}

static void __exit agp_exit(void)
{
}

#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

MODULE_AUTHOR("Dave Jones <davej@codemonkey.org.uk>");
MODULE_DESCRIPTION("AGP GART driver");
MODULE_LICENSE("GPL and additional rights");
MODULE_ALIAS_MISCDEV(AGPGART_MINOR);

module_init(agp_init);
module_exit(agp_exit);
Commit	Line	Data
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
a030ce44	46	#define AGPGART_VERSION_MINOR 102
e7745d4e	47	static const struct agp_version agp_current_version =
1da177e4 LT	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
5e9ad06a	100	static const 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	}
6730c3c1	150	flush_agp_mappings();
1da177e4	151
07eee78e	152	bridge->scratch_page_real = virt_to_gart(addr);
1da177e4 LT	153	bridge->scratch_page =
	154	bridge->driver->mask_memory(bridge, bridge->scratch_page_real, 0);
	155	}
	156
	157	size_value = bridge->driver->fetch_size();
	158	if (size_value == 0) {
	159	printk(KERN_ERR PFX "unable to determine aperture size.\n");
	160	rc = -EINVAL;
	161	goto err_out;
	162	}
	163	if (bridge->driver->create_gatt_table(bridge)) {
	164	printk(KERN_ERR PFX
	165	"unable to get memory for graphics translation table.\n");
	166	rc = -ENOMEM;
	167	goto err_out;
	168	}
	169	got_gatt = 1;
	170
	171	bridge->key_list = vmalloc(PAGE_SIZE * 4);
	172	if (bridge->key_list == NULL) {
	173	printk(KERN_ERR PFX "error allocating memory for key lists.\n");
	174	rc = -ENOMEM;
	175	goto err_out;
	176	}
	177	got_keylist = 1;
	178
	179	/* FIXME vmalloc'd memory not guaranteed contiguous */
	180	memset(bridge->key_list, 0, PAGE_SIZE * 4);
	181
	182	if (bridge->driver->configure()) {
	183	printk(KERN_ERR PFX "error configuring host chipset.\n");
	184	rc = -EINVAL;
	185	goto err_out;
	186	}
	187
	188	return 0;
	189
	190	err_out:
88d51967	191	if (bridge->driver->needs_scratch_page) {
1da177e4	192	bridge->driver->agp_destroy_page(
07eee78e	193	gart_to_virt(bridge->scratch_page_real));
6730c3c1	194	flush_agp_mappings();
88d51967	195	}
1da177e4 LT	196	if (got_gatt)
	197	bridge->driver->free_gatt_table(bridge);
	198	if (got_keylist) {
	199	vfree(bridge->key_list);
	200	bridge->key_list = NULL;
	201	}
	202	return rc;
	203	}
	204
	205	/* cannot be __exit b/c as it could be called from __init code */
	206	static void agp_backend_cleanup(struct agp_bridge_data *bridge)
	207	{
	208	if (bridge->driver->cleanup)
	209	bridge->driver->cleanup();
	210	if (bridge->driver->free_gatt_table)
	211	bridge->driver->free_gatt_table(bridge);
f9101210 JJ	212
	213	vfree(bridge->key_list);
	214	bridge->key_list = NULL;
1da177e4 LT	215
1da177e4 LT	216	if (bridge->driver->agp_destroy_page &&
88d51967	217	bridge->driver->needs_scratch_page) {
1da177e4	218	bridge->driver->agp_destroy_page(
07eee78e	219	gart_to_virt(bridge->scratch_page_real));
6730c3c1	220	flush_agp_mappings();
88d51967	221	}
1da177e4 LT	222	}
	223
	224	/* When we remove the global variable agp_bridge from all drivers
	225	* then agp_alloc_bridge and agp_generic_find_bridge need to be updated
	226	*/
	227
	228	struct agp_bridge_data *agp_alloc_bridge(void)
	229	{
0ea27d9f	230	struct agp_bridge_data *bridge;
6a92a4e0	231
0ea27d9f	232	bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
1da177e4 LT	233	if (!bridge)
	234	return NULL;
	235
1da177e4 LT	236	atomic_set(&bridge->agp_in_use, 0);
	237	atomic_set(&bridge->current_memory_agp, 0);
	238
	239	if (list_empty(&agp_bridges))
	240	agp_bridge = bridge;
	241
	242	return bridge;
	243	}
	244	EXPORT_SYMBOL(agp_alloc_bridge);
	245
	246
	247	void agp_put_bridge(struct agp_bridge_data *bridge)
	248	{
	249	kfree(bridge);
	250
	251	if (list_empty(&agp_bridges))
	252	agp_bridge = NULL;
	253	}
	254	EXPORT_SYMBOL(agp_put_bridge);
	255
	256
	257	int agp_add_bridge(struct agp_bridge_data *bridge)
	258	{
	259	int error;
	260
	261	if (agp_off)
	262	return -ENODEV;
	263
	264	if (!bridge->dev) {
	265	printk (KERN_DEBUG PFX "Erk, registering with no pci_dev!\n");
	266	return -EINVAL;
	267	}
	268
	269	/* Grab reference on the chipset driver. */
	270	if (!try_module_get(bridge->driver->owner)) {
	271	printk (KERN_INFO PFX "Couldn't lock chipset driver.\n");
	272	return -EINVAL;
	273	}
	274
	275	error = agp_backend_initialize(bridge);
	276	if (error) {
	277	printk (KERN_INFO PFX "agp_backend_initialize() failed.\n");
	278	goto err_out;
	279	}
	280
	281	if (list_empty(&agp_bridges)) {
	282	error = agp_frontend_initialize();
	283	if (error) {
	284	printk (KERN_INFO PFX "agp_frontend_initialize() failed.\n");
	285	goto frontend_err;
	286	}
	287
	288	printk(KERN_INFO PFX "AGP aperture is %dM @ 0x%lx\n",
	289	bridge->driver->fetch_size(), bridge->gart_bus_addr);
	290
	291	}
	292
	293	list_add(&bridge->list, &agp_bridges);
	294	return 0;
	295
	296	frontend_err:
	297	agp_backend_cleanup(bridge);
	298	err_out:
	299	module_put(bridge->driver->owner);
300	agp_put_bridge(bridge);
301	return error;
302	}
303	EXPORT_SYMBOL_GPL(agp_add_bridge);
304
305
306	void agp_remove_bridge(struct agp_bridge_data *bridge)
307	{
308	agp_backend_cleanup(bridge);
309	list_del(&bridge->list);
310	if (list_empty(&agp_bridges))
311	agp_frontend_cleanup();
312	module_put(bridge->driver->owner);
313	}
314	EXPORT_SYMBOL_GPL(agp_remove_bridge);
315
316	int agp_off;
317	int agp_try_unsupported_boot;
318	EXPORT_SYMBOL(agp_off);
319	EXPORT_SYMBOL(agp_try_unsupported_boot);
320
321	static int __init agp_init(void)
322	{
323	if (!agp_off)
70e8992e	324	printk(KERN_INFO "Linux agpgart interface v%d.%d\n",
1da177e4 LT	325	AGPGART_VERSION_MAJOR, AGPGART_VERSION_MINOR);
	326	return 0;
	327	}
	328
408b664a	329	static void __exit agp_exit(void)
1da177e4 LT	330	{
	331	}
	332
	333	#ifndef MODULE
	334	static __init int agp_setup(char *s)
	335	{
	336	if (!strcmp(s,"off"))
	337	agp_off = 1;
	338	if (!strcmp(s,"try_unsupported"))
	339	agp_try_unsupported_boot = 1;
	340	return 1;
	341	}
	342	__setup("agp=", agp_setup);
	343	#endif
	344
	345	MODULE_AUTHOR("Dave Jones <davej@codemonkey.org.uk>");
	346	MODULE_DESCRIPTION("AGP GART driver");
	347	MODULE_LICENSE("GPL and additional rights");
	348	MODULE_ALIAS_MISCDEV(AGPGART_MINOR);
	349
	350	module_init(agp_init);
	351	module_exit(agp_exit);
	352