152 lines
4.4 KiB
C
152 lines
4.4 KiB
C
/**
|
|
* \file drm_memory.c
|
|
* Memory management wrappers for DRM
|
|
*
|
|
* \author Rickard E. (Rik) Faith <faith@valinux.com>
|
|
* \author Gareth Hughes <gareth@valinux.com>
|
|
*/
|
|
|
|
/*
|
|
* Created: Thu Feb 4 14:00:34 1999 by faith@valinux.com
|
|
*
|
|
* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
|
|
* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
|
|
* 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, 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 (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 NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* VA LINUX SYSTEMS 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.
|
|
*/
|
|
|
|
#include <linux/highmem.h>
|
|
#include <linux/export.h>
|
|
#include <drm/drmP.h>
|
|
#include "drm_legacy.h"
|
|
|
|
#if IS_ENABLED(CONFIG_AGP)
|
|
|
|
#ifdef HAVE_PAGE_AGP
|
|
# include <asm/agp.h>
|
|
#else
|
|
# ifdef __powerpc__
|
|
# define PAGE_AGP __pgprot(_PAGE_KERNEL | _PAGE_NO_CACHE)
|
|
# else
|
|
# define PAGE_AGP PAGE_KERNEL
|
|
# endif
|
|
#endif
|
|
|
|
static void *agp_remap(unsigned long offset, unsigned long size,
|
|
struct drm_device * dev)
|
|
{
|
|
unsigned long i, num_pages =
|
|
PAGE_ALIGN(size) / PAGE_SIZE;
|
|
struct drm_agp_mem *agpmem;
|
|
struct page **page_map;
|
|
struct page **phys_page_map;
|
|
void *addr;
|
|
|
|
size = PAGE_ALIGN(size);
|
|
|
|
#ifdef __alpha__
|
|
offset -= dev->hose->mem_space->start;
|
|
#endif
|
|
|
|
list_for_each_entry(agpmem, &dev->agp->memory, head)
|
|
if (agpmem->bound <= offset
|
|
&& (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >=
|
|
(offset + size))
|
|
break;
|
|
if (&agpmem->head == &dev->agp->memory)
|
|
return NULL;
|
|
|
|
/*
|
|
* OK, we're mapping AGP space on a chipset/platform on which memory accesses by
|
|
* the CPU do not get remapped by the GART. We fix this by using the kernel's
|
|
* page-table instead (that's probably faster anyhow...).
|
|
*/
|
|
/* note: use vmalloc() because num_pages could be large... */
|
|
page_map = vmalloc(num_pages * sizeof(struct page *));
|
|
if (!page_map)
|
|
return NULL;
|
|
|
|
phys_page_map = (agpmem->memory->pages + (offset - agpmem->bound) / PAGE_SIZE);
|
|
for (i = 0; i < num_pages; ++i)
|
|
page_map[i] = phys_page_map[i];
|
|
addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
|
|
vfree(page_map);
|
|
|
|
return addr;
|
|
}
|
|
|
|
/** Wrapper around agp_free_memory() */
|
|
void drm_free_agp(struct agp_memory * handle, int pages)
|
|
{
|
|
agp_free_memory(handle);
|
|
}
|
|
|
|
/** Wrapper around agp_bind_memory() */
|
|
int drm_bind_agp(struct agp_memory * handle, unsigned int start)
|
|
{
|
|
return agp_bind_memory(handle, start);
|
|
}
|
|
|
|
/** Wrapper around agp_unbind_memory() */
|
|
int drm_unbind_agp(struct agp_memory * handle)
|
|
{
|
|
return agp_unbind_memory(handle);
|
|
}
|
|
|
|
#else /* CONFIG_AGP */
|
|
static inline void *agp_remap(unsigned long offset, unsigned long size,
|
|
struct drm_device * dev)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
#endif /* CONFIG_AGP */
|
|
|
|
void drm_legacy_ioremap(struct drm_local_map *map, struct drm_device *dev)
|
|
{
|
|
if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
|
|
map->handle = agp_remap(map->offset, map->size, dev);
|
|
else
|
|
map->handle = ioremap(map->offset, map->size);
|
|
}
|
|
EXPORT_SYMBOL(drm_legacy_ioremap);
|
|
|
|
void drm_legacy_ioremap_wc(struct drm_local_map *map, struct drm_device *dev)
|
|
{
|
|
if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
|
|
map->handle = agp_remap(map->offset, map->size, dev);
|
|
else
|
|
map->handle = ioremap_wc(map->offset, map->size);
|
|
}
|
|
EXPORT_SYMBOL(drm_legacy_ioremap_wc);
|
|
|
|
void drm_legacy_ioremapfree(struct drm_local_map *map, struct drm_device *dev)
|
|
{
|
|
if (!map->handle || !map->size)
|
|
return;
|
|
|
|
if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
|
|
vunmap(map->handle);
|
|
else
|
|
iounmap(map->handle);
|
|
}
|
|
EXPORT_SYMBOL(drm_legacy_ioremapfree);
|