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/**************************************************************************
*
* 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
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, 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 (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,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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.
*
**************************************************************************/
/*
* 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/slab.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
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