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/**
* \file drm_sg.h
* IOCTLs to manage scatter/gather memory
*
* \author Gareth Hughes <gareth@valinux.com>
*/
/*
* 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
* PRECISION INSIGHT 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.
*/
#ifndef _DRM_SCATTER_H_
#define _DRM_SCATTER_H_
/**
* Scatter/gather memory entry.
*
* This structure is used by sg_alloc() sg_free() to store all the necessary
* information about a scatter/gather memory block.
*
* Also one instance of this structure is used to hold the user-space
* allocation done via the sg_alloc_ioctl() and sg_free_ioctl() ioctl's.
*/
typedef struct drm_sg_mem {
unsigned long handle;
void *virtual; /**< virtual address */
int pages;
struct page **pagelist;
dma_addr_t *busaddr; /**< bus address */
} drm_sg_mem_t;
/** \name Prototypes */
/*@{*/
extern void DRM(sg_free)( drm_sg_mem_t *entry );
extern drm_sg_mem_t * DRM(sg_alloc)( unsigned long size );
extern int DRM(sg_alloc_ioctl)(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg);
extern int DRM(sg_free_ioctl)(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg);
extern void DRM(sg_cleanup)(drm_device_t *dev);
/*@}*/
#endif
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