167 строки
4.2 KiB
C
167 строки
4.2 KiB
C
/**
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* \file drm_memory.c
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* Memory management wrappers for DRM
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*
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* \author Rickard E. (Rik) Faith <faith@valinux.com>
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* \author Gareth Hughes <gareth@valinux.com>
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*/
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/*
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* Created: Thu Feb 4 14:00:34 1999 by faith@valinux.com
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*
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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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 (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* 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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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <linux/config.h>
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#include <linux/highmem.h>
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#include "drmP.h"
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#ifdef DEBUG_MEMORY
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#include "drm_memory_debug.h"
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#else
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/** No-op. */
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void drm_mem_init(void)
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{
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}
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/**
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* Called when "/proc/dri/%dev%/mem" is read.
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*
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* \param buf output buffer.
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* \param start start of output data.
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* \param offset requested start offset.
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* \param len requested number of bytes.
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* \param eof whether there is no more data to return.
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* \param data private data.
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* \return number of written bytes.
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*
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* No-op.
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*/
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int drm_mem_info(char *buf, char **start, off_t offset,
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int len, int *eof, void *data)
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{
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return 0;
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}
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/** Wrapper around kmalloc() and kfree() */
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void *drm_realloc(void *oldpt, size_t oldsize, size_t size, int area)
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{
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void *pt;
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if (!(pt = kmalloc(size, GFP_KERNEL)))
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return NULL;
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if (oldpt && oldsize) {
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memcpy(pt, oldpt, oldsize);
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kfree(oldpt);
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}
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return pt;
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}
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/**
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* Allocate pages.
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*
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* \param order size order.
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* \param area memory area. (Not used.)
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* \return page address on success, or zero on failure.
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*
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* Allocate and reserve free pages.
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*/
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unsigned long drm_alloc_pages(int order, int area)
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{
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unsigned long address;
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unsigned long bytes = PAGE_SIZE << order;
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unsigned long addr;
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unsigned int sz;
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address = __get_free_pages(GFP_KERNEL|__GFP_COMP, order);
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if (!address)
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return 0;
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/* Zero */
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memset((void *)address, 0, bytes);
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/* Reserve */
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for (addr = address, sz = bytes;
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sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
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SetPageReserved(virt_to_page(addr));
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}
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return address;
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}
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/**
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* Free pages.
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*
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* \param address address of the pages to free.
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* \param order size order.
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* \param area memory area. (Not used.)
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*
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* Unreserve and free pages allocated by alloc_pages().
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*/
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void drm_free_pages(unsigned long address, int order, int area)
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{
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unsigned long bytes = PAGE_SIZE << order;
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unsigned long addr;
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unsigned int sz;
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if (!address)
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return;
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/* Unreserve */
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for (addr = address, sz = bytes;
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sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
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ClearPageReserved(virt_to_page(addr));
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}
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free_pages(address, order);
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}
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#if __OS_HAS_AGP
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/** Wrapper around agp_allocate_memory() */
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DRM_AGP_MEM *drm_alloc_agp(drm_device_t * dev, int pages, u32 type)
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{
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return drm_agp_allocate_memory(dev->agp->bridge, pages, type);
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}
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/** Wrapper around agp_free_memory() */
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int drm_free_agp(DRM_AGP_MEM * handle, int pages)
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{
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return drm_agp_free_memory(handle) ? 0 : -EINVAL;
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}
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/** Wrapper around agp_bind_memory() */
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int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start)
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{
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return drm_agp_bind_memory(handle, start);
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}
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/** Wrapper around agp_unbind_memory() */
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int drm_unbind_agp(DRM_AGP_MEM * handle)
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{
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return drm_agp_unbind_memory(handle);
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}
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#endif /* agp */
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#endif /* debug_memory */
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