353 lines
8.5 KiB
C
353 lines
8.5 KiB
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 101
|
|
static 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 (c) Dave Jones\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);
|
|
|