renesas/drm.git - libdrm, cloned from git://anongit.freedesktop.org/mesa/drm

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/**
 * \file drm.h
 * Header for the Direct Rendering Manager
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 *
 * \par Acknowledgments:
 * Dec 1999, Richard Henderson <rth@twiddle.net>, move to generic \c cmpxchg.
 */

/*
 * 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.
 */

/**
 * \mainpage
 *
 * The Direct Rendering Manager (DRM) is a device-independent kernel-level
 * device driver that provides support for the XFree86 Direct Rendering
 * Infrastructure (DRI).
 *
 * The DRM supports the Direct Rendering Infrastructure (DRI) in four major
 * ways:
 *     -# The DRM provides synchronized access to the graphics hardware via
 *        the use of an optimized two-tiered lock.
 *     -# The DRM enforces the DRI security policy for access to the graphics
 *        hardware by only allowing authenticated X11 clients access to
 *        restricted regions of memory.
 *     -# The DRM provides a generic DMA engine, complete with multiple
 *        queues and the ability to detect the need for an OpenGL context
 *        switch.
 *     -# The DRM is extensible via the use of small device-specific modules
 *        that rely extensively on the API exported by the DRM module.
 *
 */

#ifndef _DRM_H_
#define _DRM_H_

#ifndef __user
#define __user
#endif
#ifndef __iomem
#define __iomem
#endif

#ifdef __GNUC__
# define DEPRECATED  __attribute__ ((deprecated))
#else
# define DEPRECATED
#endif

#if defined(__linux__)
#include <asm/ioctl.h>		/* For _IO* macros */
#define DRM_IOCTL_NR(n)		_IOC_NR(n)
#define DRM_IOC_VOID		_IOC_NONE
#define DRM_IOC_READ		_IOC_READ
#define DRM_IOC_WRITE		_IOC_WRITE
#define DRM_IOC_READWRITE	_IOC_READ|_IOC_WRITE
#define DRM_IOC(dir, group, nr, size) _IOC(dir, group, nr, size)
#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
#include <sys/ioccom.h>
#define DRM_IOCTL_NR(n)		((n) & 0xff)
#define DRM_IOC_VOID		IOC_VOID
#define DRM_IOC_READ		IOC_OUT
#define DRM_IOC_WRITE		IOC_IN
#define DRM_IOC_READWRITE	IOC_INOUT
#define DRM_IOC(dir, group, nr, size) _IOC(dir, group, nr, size)
#endif

#ifdef __OpenBSD__
#define DRM_MAJOR       81
#endif
#if defined(__linux__) || defined(__NetBSD__)
#define DRM_MAJOR       226
#endif
#define DRM_MAX_MINOR   15

#define DRM_NAME	"drm"	  /**< Name in kernel, /dev, and /proc */
#define DRM_MIN_ORDER	5	  /**< At least 2^5 bytes = 32 bytes */
#define DRM_MAX_ORDER	22	  /**< Up to 2^22 bytes = 4MB */
#define DRM_RAM_PERCENT 10	  /**< How much system ram can we lock? */

#define _DRM_LOCK_HELD	0x80000000U /**< Hardware lock is held */
#define _DRM_LOCK_CONT	0x40000000U /**< Hardware lock is contended */
#define _DRM_LOCK_IS_HELD(lock)	   ((lock) & _DRM_LOCK_HELD)
#define _DRM_LOCK_IS_CONT(lock)	   ((lock) & _DRM_LOCK_CONT)
#define _DRM_LOCKING_CONTEXT(lock) ((lock) & ~(_DRM_LOCK_HELD|_DRM_LOCK_CONT))

#if defined(__linux__)
typedef unsigned int drm_handle_t;
#else
#include <sys/types.h>
typedef unsigned long drm_handle_t;	/**< To mapped regions */
#endif
typedef unsigned int drm_context_t;	/**< GLXContext handle */
typedef unsigned int drm_drawable_t;
typedef unsigned int drm_magic_t;	/**< Magic for authentication */

/**
 * Cliprect.
 *
 * \warning If you change this structure, make sure you change
 * XF86DRIClipRectRec in the server as well
 *
 * \note KW: Actually it's illegal to change either for
 * backwards-compatibility reasons.
 */
struct drm_clip_rect {
	unsigned short x1;
	unsigned short y1;
	unsigned short x2;
	unsigned short y2;
};

/**
 * Texture region,
 */
struct drm_tex_region {
	unsigned char next;
	unsigned char prev;
	unsigned char in_use;
	unsigned char padding;
	unsigned int age;
};

/**
 * Hardware lock.
 *
 * The lock structure is a simple cache-line aligned integer.  To avoid
 * processor bus contention on a multiprocessor system, there should not be any
 * other data stored in the same cache line.
 */
struct drm_hw_lock {
	__volatile__ unsigned int lock;		/**< lock variable */
	char padding[60];			/**< Pad to cache line */
};

/* This is beyond ugly, and only works on GCC.  However, it allows me to use
 * drm.h in places (i.e., in the X-server) where I can't use size_t.  The real
 * fix is to use uint32_t instead of size_t, but that fix will break existing
 * LP64 (i.e., PowerPC64, SPARC64, IA-64, Alpha, etc.) systems.  That *will*
 * eventually happen, though.  I chose 'unsigned long' to be the fallback type
 * because that works on all the platforms I know about.  Hopefully, the
 * real fix will happen before that bites us.
 */

#ifdef __SIZE_TYPE__
# define DRM_SIZE_T __SIZE_TYPE__
#else
# warning "__SIZE_TYPE__ not defined.  Assuming sizeof(size_t) == sizeof(unsigned long)!"
# define DRM_SIZE_T unsigned long
#endif

/**
 * DRM_IOCTL_VERSION ioctl argument type.
 *
 * \sa drmGetVersion().
 */
struct drm_version {
	int version_major;	  /**< Major version */
	int version_minor;	  /**< Minor version */
	int version_patchlevel;	  /**< Patch level */
	DRM_SIZE_T name_len;	  /**< Length of name buffer */
	char __user *name;		  /**< Name of driver */
	DRM_SIZE_T date_len;	  /**< Length of date buffer */
	char __user *date;		  /**< User-space buffer to hold date */
	DRM_SIZE_T desc_len;	  /**< Length of desc buffer */
	char __user *desc;		  /**< User-space buffer to hold desc */
};

/**
 * DRM_IOCTL_GET_UNIQUE ioctl argument type.
 *
 * \sa drmGetBusid() and drmSetBusId().
 */
struct drm_unique {
	DRM_SIZE_T unique_len;	  /**< Length of unique */
	char __user *unique;		  /**< Unique name for driver instantiation */
};

#undef DRM_SIZE_T

struct drm_list {
	int count;		  /**< Length of user-space structures */
	struct drm_version __user *version;
};

struct drm_block {
	int unused;
};

/**
 * DRM_IOCTL_CONTROL ioctl argument type.
 *
 * \sa drmCtlInstHandler() and drmCtlUninstHandler().
 */
struct drm_control {
	enum {
		DRM_ADD_COMMAND,
		DRM_RM_COMMAND,
		DRM_INST_HANDLER,
		DRM_UNINST_HANDLER
	} func;
	int irq;
};

/**
 * Type of memory to map.
 */
enum drm_map_type {
	_DRM_FRAME_BUFFER = 0,	  /**< WC (no caching), no core dump */
	_DRM_REGISTERS = 1,	  /**< no caching, no core dump */
	_DRM_SHM = 2,		  /**< shared, cached */
	_DRM_AGP = 3,		  /**< AGP/GART */
	_DRM_SCATTER_GATHER = 4,  /**< Scatter/gather memory for PCI DMA */
	_DRM_CONSISTENT = 5,	  /**< Consistent memory for PCI DMA */
	_DRM_TTM = 6,
};

/**
 * Memory mapping flags.
 */
enum drm_map_flags {
	_DRM_RESTRICTED = 0x01,	     /**< Cannot be mapped to user-virtual */
	_DRM_READ_ONLY = 0x02,
	_DRM_LOCKED = 0x04,	     /**< shared, cached, locked */
	_DRM_KERNEL = 0x08,	     /**< kernel requires access */
	_DRM_WRITE_COMBINING = 0x10, /**< use write-combining if available */
	_DRM_CONTAINS_LOCK = 0x20,   /**< SHM page that contains lock */
	_DRM_REMOVABLE = 0x40,	     /**< Removable mapping */
	_DRM_DRIVER = 0x80	     /**< Managed by driver */
};

struct drm_ctx_priv_map {
	unsigned int ctx_id;	 /**< Context requesting private mapping */
	void *handle;		 /**< Handle of map */
};

/**
 * DRM_IOCTL_GET_MAP, DRM_IOCTL_ADD_MAP and DRM_IOCTL_RM_MAP ioctls
 * argument type.
 *


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