/**
* \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/config.h>
#include <linux/highmem.h>
#include "drmP.h"
#ifdef DEBUG_MEMORY
#include "drm_memory_debug.h"
#else
/** No-op. */
void drm_mem_init(void)
{
}
/**
* Called when "/proc/dri/%dev%/mem" is read.
*
* \param buf output buffer.
* \param start start of output data.
* \param offset requested start offset.
* \param len requested number of bytes.
* \param eof whether there is no more data to return.
* \param data private data.
* \return number of written bytes.
*
* No-op.
*/
int drm_mem_info(char *buf, char **start, off_t offset,
int len, int *eof, void *data)
{
return 0;
}
/** Wrapper around kmalloc() and kfree() */
void *drm_realloc(void *oldpt, size_t oldsize, size_t size, int area)
{
void *pt;
if (!(pt = kmalloc(size, GFP_KERNEL)))
return NULL;
if (oldpt && oldsize) {
memcpy(pt, oldpt, oldsize);
kfree(oldpt);
}
return pt;
}
/**
* Allocate pages.
*
* \param order size order.
* \param area memory area. (Not used.)
* \return page address on success, or zero on failure.
*
* Allocate and reserve free pages.
*/
unsigned long drm_alloc_pages(int order, int area)
{
unsigned long address;
unsigned long bytes = PAGE_SIZE << order;
unsigned long addr;
unsigned int sz;
address = __get_free_pages(GFP_KERNEL|__GFP_COMP, order);
if (!address)
return 0;
/* Zero */
memset((void *)address, 0, bytes);
/* Reserve */
for (addr = address, sz = bytes;
sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
SetPageReserved(virt_to_page(addr));
}
return address;
}
/**
* Free pages.
*
* \param address address of the pages to free.
* \param order size order.
* \param area memory area. (Not used.)
*
* Unreserve and free pages allocated by alloc_pages().
*/
void drm_free_pages(unsigned long address, int order, int area)
{
unsigned long bytes = PAGE_SIZE << order;
unsigned long addr;
unsigned int sz;
if (!address)
return;
/* Unreserve */
for (addr = address, sz = bytes;
sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr));
}
free_pages(address, order);
}
#if __OS_HAS_AGP
/** Wrapper around agp_allocate_memory() */
DRM_AGP_MEM *drm_alloc_agp(drm_device_t * dev, int pages, u32 type)
{
return drm_agp_allocate_memory(dev->agp->bridge, pages, type);
}
/** Wrapper around agp_free_memory() */
int drm_free_agp(DRM_AGP_MEM * handle, int pages)
{
return drm_agp_free_memory(handle) ? 0 : -EINVAL;
}
/** Wrapper around agp_bind_memory() */
int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start)
{
return drm_agp_bind_memory(handle, start);
}
/** Wrapper around agp_unbind_memory() */
int drm_unbind_agp(DRM_AGP_MEM * handle)
{
return drm_agp_unbind_memory(handle);
}
#endif /* agp */
#endif /* debug_memory */
