linux/drivers/gpu/drm/ttm/ttm_agp_backend.c
Dave Airlie 07613ba2f4 agp: switch AGP to use page array instead of unsigned long array
This switches AGP to use an array of pages for tracking the
pages allocated to the GART. This should enable GEM on PAE to work
a lot better as we can pass highmem pages to the PAT code and it will
do the right thing with them.

Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-06-19 10:21:42 +10:00

150 lines
4.2 KiB
C

/**************************************************************************
*
* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
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* without limitation the rights to use, copy, modify, merge, publish,
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* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) 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,
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/*
* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
* Keith Packard.
*/
#include "ttm/ttm_module.h"
#include "ttm/ttm_bo_driver.h"
#ifdef TTM_HAS_AGP
#include "ttm/ttm_placement.h"
#include <linux/agp_backend.h>
#include <linux/module.h>
#include <linux/io.h>
#include <asm/agp.h>
struct ttm_agp_backend {
struct ttm_backend backend;
struct agp_memory *mem;
struct agp_bridge_data *bridge;
};
static int ttm_agp_populate(struct ttm_backend *backend,
unsigned long num_pages, struct page **pages,
struct page *dummy_read_page)
{
struct ttm_agp_backend *agp_be =
container_of(backend, struct ttm_agp_backend, backend);
struct page **cur_page, **last_page = pages + num_pages;
struct agp_memory *mem;
mem = agp_allocate_memory(agp_be->bridge, num_pages, AGP_USER_MEMORY);
if (unlikely(mem == NULL))
return -ENOMEM;
mem->page_count = 0;
for (cur_page = pages; cur_page < last_page; ++cur_page) {
struct page *page = *cur_page;
if (!page)
page = dummy_read_page;
mem->pages[mem->page_count++] = page;
}
agp_be->mem = mem;
return 0;
}
static int ttm_agp_bind(struct ttm_backend *backend, struct ttm_mem_reg *bo_mem)
{
struct ttm_agp_backend *agp_be =
container_of(backend, struct ttm_agp_backend, backend);
struct agp_memory *mem = agp_be->mem;
int cached = (bo_mem->placement & TTM_PL_FLAG_CACHED);
int ret;
mem->is_flushed = 1;
mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;
ret = agp_bind_memory(mem, bo_mem->mm_node->start);
if (ret)
printk(KERN_ERR TTM_PFX "AGP Bind memory failed.\n");
return ret;
}
static int ttm_agp_unbind(struct ttm_backend *backend)
{
struct ttm_agp_backend *agp_be =
container_of(backend, struct ttm_agp_backend, backend);
if (agp_be->mem->is_bound)
return agp_unbind_memory(agp_be->mem);
else
return 0;
}
static void ttm_agp_clear(struct ttm_backend *backend)
{
struct ttm_agp_backend *agp_be =
container_of(backend, struct ttm_agp_backend, backend);
struct agp_memory *mem = agp_be->mem;
if (mem) {
ttm_agp_unbind(backend);
agp_free_memory(mem);
}
agp_be->mem = NULL;
}
static void ttm_agp_destroy(struct ttm_backend *backend)
{
struct ttm_agp_backend *agp_be =
container_of(backend, struct ttm_agp_backend, backend);
if (agp_be->mem)
ttm_agp_clear(backend);
kfree(agp_be);
}
static struct ttm_backend_func ttm_agp_func = {
.populate = ttm_agp_populate,
.clear = ttm_agp_clear,
.bind = ttm_agp_bind,
.unbind = ttm_agp_unbind,
.destroy = ttm_agp_destroy,
};
struct ttm_backend *ttm_agp_backend_init(struct ttm_bo_device *bdev,
struct agp_bridge_data *bridge)
{
struct ttm_agp_backend *agp_be;
agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);
if (!agp_be)
return NULL;
agp_be->mem = NULL;
agp_be->bridge = bridge;
agp_be->backend.func = &ttm_agp_func;
agp_be->backend.bdev = bdev;
return &agp_be->backend;
}
EXPORT_SYMBOL(ttm_agp_backend_init);
#endif