344 lines
8.4 KiB
C
344 lines
8.4 KiB
C
/*
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* AGPGART driver backend routines.
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* Copyright (C) 2002-2003 Dave Jones.
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* Copyright (C) 1999 Jeff Hartmann.
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* Copyright (C) 1999 Precision Insight, Inc.
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* Copyright (C) 1999 Xi Graphics, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* JEFF HARTMANN, DAVE JONES, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
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* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* TODO:
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* - Allocate more than order 0 pages to avoid too much linear map splitting.
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*/
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/pagemap.h>
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#include <linux/miscdevice.h>
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#include <linux/pm.h>
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#include <linux/agp_backend.h>
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#include <linux/agpgart.h>
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#include <linux/vmalloc.h>
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#include <asm/io.h>
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#include "agp.h"
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/* Due to XFree86 brain-damage, we can't go to 1.0 until they
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* fix some real stupidity. It's only by chance we can bump
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* past 0.99 at all due to some boolean logic error. */
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#define AGPGART_VERSION_MAJOR 0
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#define AGPGART_VERSION_MINOR 100
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static struct agp_version agp_current_version =
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{
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.major = AGPGART_VERSION_MAJOR,
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.minor = AGPGART_VERSION_MINOR,
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};
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static int agp_count=0;
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struct agp_bridge_data agp_bridge_dummy = { .type = NOT_SUPPORTED };
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struct agp_bridge_data *agp_bridge = &agp_bridge_dummy;
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EXPORT_SYMBOL(agp_bridge);
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/**
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* agp_backend_acquire - attempt to acquire the agp backend.
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*
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* returns -EBUSY if agp is in use,
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* returns 0 if the caller owns the agp backend
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*/
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int agp_backend_acquire(void)
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{
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if (agp_bridge->type == NOT_SUPPORTED)
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return -EINVAL;
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if (atomic_read(&agp_bridge->agp_in_use))
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return -EBUSY;
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atomic_inc(&agp_bridge->agp_in_use);
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return 0;
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}
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EXPORT_SYMBOL(agp_backend_acquire);
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/**
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* agp_backend_release - release the lock on the agp backend.
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*
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* The caller must insure that the graphics aperture translation table
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* is read for use by another entity.
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*
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* (Ensure that all memory it bound is unbound.)
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*/
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void agp_backend_release(void)
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{
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if (agp_bridge->type != NOT_SUPPORTED)
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atomic_dec(&agp_bridge->agp_in_use);
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}
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EXPORT_SYMBOL(agp_backend_release);
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struct { int mem, agp; } maxes_table[] = {
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{0, 0},
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{32, 4},
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{64, 28},
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{128, 96},
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{256, 204},
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{512, 440},
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{1024, 942},
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{2048, 1920},
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{4096, 3932}
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};
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static int agp_find_max(void)
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{
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long memory, index, result;
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#if PAGE_SHIFT < 20
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memory = num_physpages >> (20 - PAGE_SHIFT);
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#else
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memory = num_physpages << (PAGE_SHIFT - 20);
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#endif
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index = 1;
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while ((memory > maxes_table[index].mem) && (index < 8))
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index++;
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result = maxes_table[index - 1].agp +
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( (memory - maxes_table[index - 1].mem) *
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(maxes_table[index].agp - maxes_table[index - 1].agp)) /
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(maxes_table[index].mem - maxes_table[index - 1].mem);
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printk(KERN_INFO PFX "Maximum main memory to use for agp memory: %ldM\n", result);
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result = result << (20 - PAGE_SHIFT);
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return result;
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}
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static int agp_backend_initialize(struct agp_bridge_data *bridge)
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{
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int size_value, rc, got_gatt=0, got_keylist=0;
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bridge->max_memory_agp = agp_find_max();
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bridge->version = &agp_current_version;
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if (bridge->driver->needs_scratch_page) {
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void *addr = bridge->driver->agp_alloc_page();
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if (!addr) {
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printk(KERN_ERR PFX "unable to get memory for scratch page.\n");
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return -ENOMEM;
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}
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bridge->scratch_page_real = virt_to_phys(addr);
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bridge->scratch_page =
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bridge->driver->mask_memory(bridge->scratch_page_real, 0);
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}
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size_value = bridge->driver->fetch_size();
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if (size_value == 0) {
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printk(KERN_ERR PFX "unable to determine aperture size.\n");
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rc = -EINVAL;
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goto err_out;
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}
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if (bridge->driver->create_gatt_table()) {
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printk(KERN_ERR PFX
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"unable to get memory for graphics translation table.\n");
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rc = -ENOMEM;
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goto err_out;
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}
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got_gatt = 1;
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bridge->key_list = vmalloc(PAGE_SIZE * 4);
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if (bridge->key_list == NULL) {
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printk(KERN_ERR PFX "error allocating memory for key lists.\n");
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rc = -ENOMEM;
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goto err_out;
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}
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got_keylist = 1;
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/* FIXME vmalloc'd memory not guaranteed contiguous */
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memset(bridge->key_list, 0, PAGE_SIZE * 4);
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if (bridge->driver->configure()) {
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printk(KERN_ERR PFX "error configuring host chipset.\n");
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rc = -EINVAL;
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goto err_out;
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}
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printk(KERN_INFO PFX "AGP aperture is %dM @ 0x%lx\n",
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size_value, bridge->gart_bus_addr);
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return 0;
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err_out:
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if (bridge->driver->needs_scratch_page)
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bridge->driver->agp_destroy_page(
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phys_to_virt(bridge->scratch_page_real));
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if (got_gatt)
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bridge->driver->free_gatt_table();
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if (got_keylist) {
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vfree(bridge->key_list);
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bridge->key_list = NULL;
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}
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return rc;
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}
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/* cannot be __exit b/c as it could be called from __init code */
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static void agp_backend_cleanup(struct agp_bridge_data *bridge)
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{
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if (bridge->driver->cleanup)
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bridge->driver->cleanup();
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if (bridge->driver->free_gatt_table)
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bridge->driver->free_gatt_table();
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if (bridge->key_list) {
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vfree(bridge->key_list);
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bridge->key_list = NULL;
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}
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if (bridge->driver->agp_destroy_page &&
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bridge->driver->needs_scratch_page)
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bridge->driver->agp_destroy_page(
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phys_to_virt(bridge->scratch_page_real));
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}
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static const drm_agp_t drm_agp = {
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&agp_free_memory,
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&agp_allocate_memory,
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&agp_bind_memory,
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&agp_unbind_memory,
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&agp_enable,
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&agp_backend_acquire,
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&agp_backend_release,
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&agp_copy_info
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};
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/* XXX Kludge alert: agpgart isn't ready for multiple bridges yet */
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struct agp_bridge_data *agp_alloc_bridge(void)
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{
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return agp_bridge;
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}
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EXPORT_SYMBOL(agp_alloc_bridge);
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void agp_put_bridge(struct agp_bridge_data *bridge)
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{
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}
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EXPORT_SYMBOL(agp_put_bridge);
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int agp_add_bridge(struct agp_bridge_data *bridge)
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{
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int error;
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if (agp_off)
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return -ENODEV;
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if (!bridge->dev) {
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printk (KERN_DEBUG PFX "Erk, registering with no pci_dev!\n");
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return -EINVAL;
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}
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if (agp_count) {
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printk (KERN_INFO PFX
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"Only one agpgart device currently supported.\n");
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return -ENODEV;
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}
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/* Grab reference on the chipset driver. */
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if (!try_module_get(bridge->driver->owner)) {
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printk (KERN_INFO PFX "Couldn't lock chipset driver.\n");
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return -EINVAL;
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}
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bridge->type = SUPPORTED;
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error = agp_backend_initialize(agp_bridge);
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if (error) {
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printk (KERN_INFO PFX "agp_backend_initialize() failed.\n");
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goto err_out;
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}
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error = agp_frontend_initialize();
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if (error) {
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printk (KERN_INFO PFX "agp_frontend_initialize() failed.\n");
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goto frontend_err;
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}
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/* FIXME: What to do with this? */
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inter_module_register("drm_agp", THIS_MODULE, &drm_agp);
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agp_count++;
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return 0;
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frontend_err:
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agp_backend_cleanup(agp_bridge);
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err_out:
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bridge->type = NOT_SUPPORTED;
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module_put(bridge->driver->owner);
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return error;
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}
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EXPORT_SYMBOL_GPL(agp_add_bridge);
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void agp_remove_bridge(struct agp_bridge_data *bridge)
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{
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bridge->type = NOT_SUPPORTED;
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agp_frontend_cleanup();
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agp_backend_cleanup(bridge);
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inter_module_unregister("drm_agp");
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agp_count--;
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module_put(bridge->driver->owner);
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}
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EXPORT_SYMBOL_GPL(agp_remove_bridge);
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int agp_off;
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int agp_try_unsupported_boot;
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EXPORT_SYMBOL(agp_off);
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EXPORT_SYMBOL(agp_try_unsupported_boot);
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static int __init agp_init(void)
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{
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if (!agp_off)
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printk(KERN_INFO "Linux agpgart interface v%d.%d (c) Dave Jones\n",
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AGPGART_VERSION_MAJOR, AGPGART_VERSION_MINOR);
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return 0;
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}
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void __exit agp_exit(void)
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{
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}
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#ifndef MODULE
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static __init int agp_setup(char *s)
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{
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if (!strcmp(s,"off"))
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agp_off = 1;
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if (!strcmp(s,"try_unsupported"))
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agp_try_unsupported_boot = 1;
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return 1;
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}
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__setup("agp=", agp_setup);
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#endif
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MODULE_AUTHOR("Dave Jones <davej@codemonkey.org.uk>");
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MODULE_DESCRIPTION("AGP GART driver");
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MODULE_LICENSE("GPL and additional rights");
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MODULE_ALIAS_MISCDEV(AGPGART_MINOR);
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module_init(agp_init);
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module_exit(agp_exit);
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