/**

   * \file drmP.h

   * Private header for Direct Rendering Manager

   *

   * \author Rickard E. (Rik) Faith <faith@valinux.com>
   * \author Gareth Hughes <gareth@valinux.com>
   */
  
  /*
   * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
   * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.

   * Copyright (c) 2009-2010, Code Aurora Forum.

   * 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.
   */
  
  #ifndef _DRM_P_H_
  #define _DRM_P_H_

  #ifdef __KERNEL__
  #ifdef __alpha__
  /* add include of current.h so that "current" is defined
   * before static inline funcs in wait.h. Doing this so we
   * can build the DRM (part of PI DRI). 4/21/2000 S + B */
  #include <asm/current.h>

  #endif				/* __alpha__ */

  #include <linux/kernel.h>
  #include <linux/miscdevice.h>
  #include <linux/fs.h>
  #include <linux/proc_fs.h>
  #include <linux/init.h>
  #include <linux/file.h>

  #include <linux/platform_device.h>

  #include <linux/pci.h>

  #include <linux/jiffies.h>

  #include <linux/dma-mapping.h>

  #include <linux/mm.h>
  #include <linux/cdev.h>

  #include <linux/mutex.h>

  #include <linux/slab.h>

  #if defined(__alpha__) || defined(__powerpc__)

  #include <asm/pgtable.h>	/* For pte_wrprotect */

  #endif
  #include <asm/io.h>
  #include <asm/mman.h>
  #include <asm/uaccess.h>
  #ifdef CONFIG_MTRR
  #include <asm/mtrr.h>
  #endif
  #if defined(CONFIG_AGP) || defined(CONFIG_AGP_MODULE)
  #include <linux/types.h>
  #include <linux/agp_backend.h>
  #endif
  #include <linux/workqueue.h>
  #include <linux/poll.h>
  #include <asm/pgalloc.h>
  #include "drm.h"

  #include <linux/idr.h>

  #define __OS_HAS_AGP (defined(CONFIG_AGP) || (defined(CONFIG_AGP_MODULE) && defined(MODULE)))
  #define __OS_HAS_MTRR (defined(CONFIG_MTRR))

  struct module;

  struct drm_file;
  struct drm_device;

  #include "drm_os_linux.h"

  #include "drm_hashtab.h"

  #include "drm_mm.h"

  #define DRM_UT_CORE 		0x01
  #define DRM_UT_DRIVER		0x02
  #define DRM_UT_KMS		0x04

  /*
   * Three debug levels are defined.
   * drm_core, drm_driver, drm_kms
   * drm_core level can be used in the generic drm code. For example:
   * 	drm_ioctl, drm_mm, drm_memory

   * The macro definition of DRM_DEBUG is used.

   * 	DRM_DEBUG(fmt, args...)
   * 	The debug info by using the DRM_DEBUG can be obtained by adding
   * 	the boot option of "drm.debug=1".
   *
   * drm_driver level can be used in the specific drm driver. It is used
   * to add the debug info related with the drm driver. For example:
   * i915_drv, i915_dma, i915_gem, radeon_drv,
   * 	The macro definition of DRM_DEBUG_DRIVER can be used.
   * 	DRM_DEBUG_DRIVER(fmt, args...)
   * 	The debug info by using the DRM_DEBUG_DRIVER can be obtained by
   * 	adding the boot option of "drm.debug=0x02"
   *
   * drm_kms level can be used in the KMS code related with specific drm driver.
   * It is used to add the debug info related with KMS mode. For example:
   * the connector/crtc ,
   * 	The macro definition of DRM_DEBUG_KMS can be used.
   * 	DRM_DEBUG_KMS(fmt, args...)
   * 	The debug info by using the DRM_DEBUG_KMS can be obtained by
   * 	adding the boot option of "drm.debug=0x04"
   *
   * If we add the boot option of "drm.debug=0x06", we can get the debug info by
   * using the DRM_DEBUG_KMS and DRM_DEBUG_DRIVER.
   * If we add the boot option of "drm.debug=0x05", we can get the debug info by
   * using the DRM_DEBUG_KMS and DRM_DEBUG.
   */

  extern __printf(4, 5)

  void drm_ut_debug_printk(unsigned int request_level,

  			 const char *prefix,
  			 const char *function_name,
  			 const char *format, ...);
  extern __printf(2, 3)

  int drm_err(const char *func, const char *format, ...);

  /***********************************************************************/
  /** 
  ame DRM template customization defaults */
  /*@{*/
  
  /* driver capabilities and requirements mask */
  #define DRIVER_USE_AGP     0x1
  #define DRIVER_REQUIRE_AGP 0x2
  #define DRIVER_USE_MTRR    0x4
  #define DRIVER_PCI_DMA     0x8
  #define DRIVER_SG          0x10
  #define DRIVER_HAVE_DMA    0x20
  #define DRIVER_HAVE_IRQ    0x40
  #define DRIVER_IRQ_SHARED  0x80

  #define DRIVER_IRQ_VBL     0x100

  #define DRIVER_DMA_QUEUE   0x200

  #define DRIVER_FB_DMA      0x400

  #define DRIVER_IRQ_VBL2    0x800

  #define DRIVER_GEM         0x1000

  #define DRIVER_MODESET     0x2000

  
  #define DRIVER_BUS_PCI 0x1
  #define DRIVER_BUS_PLATFORM 0x2
  #define DRIVER_BUS_USB 0x3

  
  /***********************************************************************/
  /** 
  ame Begin the DRM... */
  /*@{*/
  
  #define DRM_DEBUG_CODE 2	  /**< Include debugging code if > 1, then
  				     also include looping detection. */

  #define DRM_MAGIC_HASH_ORDER  4  /**< Size of key hash table. Must be power of 2. */

  #define DRM_KERNEL_CONTEXT    0	 /**< Change drm_resctx if changed */
  #define DRM_RESERVED_CONTEXTS 1	 /**< Change drm_resctx if changed */
  #define DRM_LOOPING_LIMIT     5000000

  #define DRM_TIME_SLICE	      (HZ/20)  /**< Time slice for GLXContexts */
  #define DRM_LOCK_SLICE	      1	/**< Time slice for lock, in jiffies */
  
  #define DRM_FLAG_DEBUG	  0x01

  #define DRM_MAX_CTXBITMAP (PAGE_SIZE * 8)

  #define DRM_MAP_HASH_OFFSET 0x10000000

  /*@}*/

  
  /***********************************************************************/

  /** 
  ame Macros to make printk easier */
  /*@{*/
  
  /**
   * Error output.
   *
   * \param fmt printf() like format string.
   * \param arg arguments
   */

  #define DRM_ERROR(fmt, ...)				\
  	drm_err(__func__, fmt, ##__VA_ARGS__)

  #define DRM_INFO(fmt, ...)				\
  	printk(KERN_INFO "[" DRM_NAME "] " fmt, ##__VA_ARGS__)

  
  /**
   * Debug output.

   *

   * \param fmt printf() like format string.
   * \param arg arguments
   */
  #if DRM_DEBUG_CODE

  #define DRM_DEBUG(fmt, args...)						\

  	do {								\

  		drm_ut_debug_printk(DRM_UT_CORE, DRM_NAME, 		\
  					__func__, fmt, ##args);		\
  	} while (0)

  #define DRM_DEBUG_DRIVER(fmt, args...)					\

  	do {								\

  		drm_ut_debug_printk(DRM_UT_DRIVER, DRM_NAME,		\

  					__func__, fmt, ##args);		\
  	} while (0)

  #define DRM_DEBUG_KMS(fmt, args...)				\

  	do {								\

  		drm_ut_debug_printk(DRM_UT_KMS, DRM_NAME, 		\

  					 __func__, fmt, ##args);	\
  	} while (0)

  #define DRM_LOG(fmt, args...)						\
  	do {								\
  		drm_ut_debug_printk(DRM_UT_CORE, NULL,			\
  					NULL, fmt, ##args);		\
  	} while (0)
  #define DRM_LOG_KMS(fmt, args...)					\
  	do {								\
  		drm_ut_debug_printk(DRM_UT_KMS, NULL,			\
  					NULL, fmt, ##args);		\
  	} while (0)
  #define DRM_LOG_MODE(fmt, args...)					\
  	do {								\
  		drm_ut_debug_printk(DRM_UT_MODE, NULL,			\
  					NULL, fmt, ##args);		\
  	} while (0)
  #define DRM_LOG_DRIVER(fmt, args...)					\
  	do {								\
  		drm_ut_debug_printk(DRM_UT_DRIVER, NULL,		\
  					NULL, fmt, ##args);		\

  	} while (0)
  #else

  #define DRM_DEBUG_DRIVER(fmt, args...) do { } while (0)
  #define DRM_DEBUG_KMS(fmt, args...)	do { } while (0)

  #define DRM_DEBUG(fmt, arg...)		 do { } while (0)

  #define DRM_LOG(fmt, arg...)		do { } while (0)
  #define DRM_LOG_KMS(fmt, args...) do { } while (0)
  #define DRM_LOG_MODE(fmt, arg...) do { } while (0)
  #define DRM_LOG_DRIVER(fmt, arg...) do { } while (0)

  #endif

  /*@}*/

  /***********************************************************************/
  /** 
  ame Internal types and structures */
  /*@{*/

  #define DRM_ARRAY_SIZE(x) ARRAY_SIZE(x)

  
  #define DRM_LEFTCOUNT(x) (((x)->rp + (x)->count - (x)->wp) % ((x)->count + 1))
  #define DRM_BUFCOUNT(x) ((x)->count - DRM_LEFTCOUNT(x))

  
  #define DRM_IF_VERSION(maj, min) (maj << 16 | min)

  
  /**
   * Test that the hardware lock is held by the caller, returning otherwise.
   *
   * \param dev DRM device.
   * \param filp file pointer of the caller.
   */

  #define LOCK_TEST_WITH_RETURN( dev, _file_priv )				\
  do {										\
  	if (!_DRM_LOCK_IS_HELD(_file_priv->master->lock.hw_lock->lock) ||	\
  	    _file_priv->master->lock.file_priv != _file_priv)	{		\

  		DRM_ERROR( "%s called without lock held, held  %d owner %p %p
  ",\

  			   __func__, _DRM_LOCK_IS_HELD(_file_priv->master->lock.hw_lock->lock),\
  			   _file_priv->master->lock.file_priv, _file_priv);	\
  		return -EINVAL;							\
  	}									\

  } while (0)
  
  /**

   * Ioctl function type.
   *
   * \param inode device inode.

   * \param file_priv DRM file private pointer.

   * \param cmd command.
   * \param arg argument.
   */

  typedef int drm_ioctl_t(struct drm_device *dev, void *data,
  			struct drm_file *file_priv);

  typedef int drm_ioctl_compat_t(struct file *filp, unsigned int cmd,
  			       unsigned long arg);

  #define DRM_IOCTL_NR(n)                _IOC_NR(n)
  #define DRM_MAJOR       226

  #define DRM_AUTH	0x1
  #define	DRM_MASTER	0x2
  #define DRM_ROOT_ONLY	0x4

  #define DRM_CONTROL_ALLOW 0x8

  #define DRM_UNLOCKED	0x10

  struct drm_ioctl_desc {
  	unsigned int cmd;

  	int flags;

  	drm_ioctl_t *func;

  	unsigned int cmd_drv;

  };
  
  /**
   * Creates a driver or general drm_ioctl_desc array entry for the given
   * ioctl, for use by drm_ioctl().
   */

  
  #define DRM_IOCTL_DEF_DRV(ioctl, _func, _flags)			\
  	[DRM_IOCTL_NR(DRM_##ioctl)] = {.cmd = DRM_##ioctl, .func = _func, .flags = _flags, .cmd_drv = DRM_IOCTL_##ioctl}

  struct drm_magic_entry {

  	struct list_head head;

  	struct drm_hash_item hash_item;

  	struct drm_file *priv;

  };

  struct drm_vma_entry {

  	struct list_head head;

  	struct vm_area_struct *vma;

  	pid_t pid;

  };

  
  /**
   * DMA buffer.
   */

  struct drm_buf {

  	int idx;		       /**< Index into master buflist */
  	int total;		       /**< Buffer size */
  	int order;		       /**< log-base-2(total) */
  	int used;		       /**< Amount of buffer in use (for DMA) */
  	unsigned long offset;	       /**< Byte offset (used internally) */
  	void *address;		       /**< Address of buffer */
  	unsigned long bus_address;     /**< Bus address of buffer */
  	struct drm_buf *next;	       /**< Kernel-only: used for free list */
  	__volatile__ int waiting;      /**< On kernel DMA queue */
  	__volatile__ int pending;      /**< On hardware DMA queue */

  	wait_queue_head_t dma_wait;    /**< Processes waiting */

  	struct drm_file *file_priv;    /**< Private of holding file descr */

  	int context;		       /**< Kernel queue for this buffer */
  	int while_locked;	       /**< Dispatch this buffer while locked */

  	enum {

  		DRM_LIST_NONE = 0,
  		DRM_LIST_FREE = 1,
  		DRM_LIST_WAIT = 2,
  		DRM_LIST_PEND = 3,
  		DRM_LIST_PRIO = 4,

  		DRM_LIST_RECLAIM = 5

  	} list;			       /**< Which list we're on */

  	int dev_priv_size;		 /**< Size of buffer private storage */
  	void *dev_private;		 /**< Per-buffer private storage */

  };

  /** bufs is one longer than it has to be */

  struct drm_waitlist {

  	int count;			/**< Number of possible buffers */

  	struct drm_buf **bufs;		/**< List of pointers to buffers */
  	struct drm_buf **rp;			/**< Read pointer */
  	struct drm_buf **wp;			/**< Write pointer */
  	struct drm_buf **end;		/**< End pointer */

  	spinlock_t read_lock;
  	spinlock_t write_lock;

  };

  struct drm_freelist {

  	int initialized;	       /**< Freelist in use */
  	atomic_t count;		       /**< Number of free buffers */

  	struct drm_buf *next;	       /**< End pointer */

  
  	wait_queue_head_t waiting;     /**< Processes waiting on free bufs */

  	int low_mark;		       /**< Low water mark */
  	int high_mark;		       /**< High water mark */
  	atomic_t wfh;		       /**< If waiting for high mark */
  	spinlock_t lock;

  };

  typedef struct drm_dma_handle {
  	dma_addr_t busaddr;
  	void *vaddr;
  	size_t size;
  } drm_dma_handle_t;

  /**
   * Buffer entry.  There is one of this for each buffer size order.
   */

  struct drm_buf_entry {

  	int buf_size;			/**< size */
  	int buf_count;			/**< number of buffers */

  	struct drm_buf *buflist;		/**< buffer list */

  	int seg_count;
  	int page_order;

  	struct drm_dma_handle **seglist;

  	struct drm_freelist freelist;
  };

  /* Event queued up for userspace to read */
  struct drm_pending_event {
  	struct drm_event *event;
  	struct list_head link;
  	struct drm_file *file_priv;

  	pid_t pid; /* pid of requester, no guarantee it's valid by the time
  		      we deliver the event, for tracing only */

  	void (*destroy)(struct drm_pending_event *event);
  };

  /** File private data */

  struct drm_file {

  	int authenticated;

  	pid_t pid;
  	uid_t uid;
  	drm_magic_t magic;
  	unsigned long ioctl_count;

  	struct list_head lhead;

  	struct drm_minor *minor;

  	unsigned long lock_count;

  	/** Mapping of mm object handles to object pointers. */
  	struct idr object_idr;
  	/** Lock for synchronization of access to object_idr. */
  	spinlock_t table_lock;

  	struct file *filp;

  	void *driver_priv;

  
  	int is_master; /* this file private is a master for a minor */
  	struct drm_master *master; /* master this node is currently associated with
  				      N.B. not always minor->master */

  	struct list_head fbs;

  
  	wait_queue_head_t event_wait;
  	struct list_head event_list;
  	int event_space;

  };

  
  /** Wait queue */

  struct drm_queue {

  	atomic_t use_count;		/**< Outstanding uses (+1) */
  	atomic_t finalization;		/**< Finalization in progress */
  	atomic_t block_count;		/**< Count of processes waiting */
  	atomic_t block_read;		/**< Queue blocked for reads */

  	wait_queue_head_t read_queue;	/**< Processes waiting on block_read */

  	atomic_t block_write;		/**< Queue blocked for writes */

  	wait_queue_head_t write_queue;	/**< Processes waiting on block_write */

  	atomic_t total_queued;		/**< Total queued statistic */
  	atomic_t total_flushed;		/**< Total flushes statistic */
  	atomic_t total_locks;		/**< Total locks statistics */

  	enum drm_ctx_flags flags;	/**< Context preserving and 2D-only */

  	struct drm_waitlist waitlist;	/**< Pending buffers */

  	wait_queue_head_t flush_queue;	/**< Processes waiting until flush */

  };

  
  /**
   * Lock data.
   */

  struct drm_lock_data {

  	struct drm_hw_lock *hw_lock;	/**< Hardware lock */

  	/** Private of lock holder's file (NULL=kernel) */
  	struct drm_file *file_priv;

  	wait_queue_head_t lock_queue;	/**< Queue of blocked processes */

  	unsigned long lock_time;	/**< Time of last lock in jiffies */

  	spinlock_t spinlock;
  	uint32_t kernel_waiters;
  	uint32_t user_waiters;
  	int idle_has_lock;

  };

  
  /**
   * DMA data.
   */

  struct drm_device_dma {

  	struct drm_buf_entry bufs[DRM_MAX_ORDER + 1];	/**< buffers, grouped by their size order */

  	int buf_count;			/**< total number of buffers */

  	struct drm_buf **buflist;		/**< Vector of pointers into drm_device_dma::bufs */

  	int seg_count;
  	int page_count;			/**< number of pages */
  	unsigned long *pagelist;	/**< page list */
  	unsigned long byte_count;

  	enum {
  		_DRM_DMA_USE_AGP = 0x01,

  		_DRM_DMA_USE_SG = 0x02,

  		_DRM_DMA_USE_FB = 0x04,
  		_DRM_DMA_USE_PCI_RO = 0x08

  	} flags;

  };

  /**

   * AGP memory entry.  Stored as a doubly linked list.
   */

  struct drm_agp_mem {

  	unsigned long handle;		/**< handle */
  	DRM_AGP_MEM *memory;
  	unsigned long bound;		/**< address */
  	int pages;

  	struct list_head head;

  };

  
  /**
   * AGP data.
   *
   * \sa drm_agp_init() and drm_device::agp.
   */

  struct drm_agp_head {

  	DRM_AGP_KERN agp_info;		/**< AGP device information */

  	struct list_head memory;

  	unsigned long mode;		/**< AGP mode */
  	struct agp_bridge_data *bridge;
  	int enabled;			/**< whether the AGP bus as been enabled */
  	int acquired;			/**< whether the AGP device has been acquired */
  	unsigned long base;
  	int agp_mtrr;
  	int cant_use_aperture;
  	unsigned long page_mask;

  };

  
  /**
   * Scatter-gather memory.
   */

  struct drm_sg_mem {

  	unsigned long handle;
  	void *virtual;
  	int pages;
  	struct page **pagelist;
  	dma_addr_t *busaddr;

  };

  struct drm_sigdata {

  	int context;

  	struct drm_hw_lock *lock;

  };

  /**

   * Kernel side of a mapping
   */
  struct drm_local_map {

  	resource_size_t offset;	 /**< Requested physical address (0 for SAREA)*/

  	unsigned long size;	 /**< Requested physical size (bytes) */
  	enum drm_map_type type;	 /**< Type of memory to map */
  	enum drm_map_flags flags;	 /**< Flags */
  	void *handle;		 /**< User-space: "Handle" to pass to mmap() */
  				 /**< Kernel-space: kernel-virtual address */
  	int mtrr;		 /**< MTRR slot used */
  };
  
  typedef struct drm_local_map drm_local_map_t;
  
  /**

   * Mappings list
   */

  struct drm_map_list {

  	struct list_head head;		/**< list head */

  	struct drm_hash_item hash;

  	struct drm_local_map *map;	/**< mapping */

  	uint64_t user_token;

  	struct drm_master *master;

  	struct drm_mm_node *file_offset_node;	/**< fake offset */

  };

  /**
   * Context handle list
   */

  struct drm_ctx_list {

  	struct list_head head;		/**< list head */
  	drm_context_t handle;		/**< context handle */

  	struct drm_file *tag;		/**< associated fd private data */

  };

  /* location of GART table */
  #define DRM_ATI_GART_MAIN 1
  #define DRM_ATI_GART_FB   2

  #define DRM_ATI_GART_PCI 1
  #define DRM_ATI_GART_PCIE 2
  #define DRM_ATI_GART_IGP 3

  struct drm_ati_pcigart_info {

  	int gart_table_location;

  	int gart_reg_if;

  	void *addr;

  	dma_addr_t bus_addr;

  	dma_addr_t table_mask;
  	struct drm_dma_handle *table_handle;

  	struct drm_local_map mapping;

  	int table_size;

  };

  /**

   * GEM specific mm private for tracking GEM objects
   */
  struct drm_gem_mm {
  	struct drm_mm offset_manager;	/**< Offset mgmt for buffer objects */
  	struct drm_open_hash offset_hash; /**< User token hash table for maps */
  };
  
  /**

   * This structure defines the drm_mm memory object, which will be used by the
   * DRM for its buffer objects.
   */
  struct drm_gem_object {
  	/** Reference count of this object */
  	struct kref refcount;
  
  	/** Handle count of this object. Each handle also holds a reference */

  	atomic_t handle_count; /* number of handles on this object */

  
  	/** Related drm device */
  	struct drm_device *dev;
  
  	/** File representing the shmem storage */
  	struct file *filp;

  	/* Mapping info for this object */
  	struct drm_map_list map_list;

  	/**
  	 * Size of the object, in bytes.  Immutable over the object's
  	 * lifetime.
  	 */
  	size_t size;
  
  	/**
  	 * Global name for this object, starts at 1. 0 means unnamed.
  	 * Access is covered by the object_name_lock in the related drm_device
  	 */
  	int name;
  
  	/**
  	 * Memory domains. These monitor which caches contain read/write data
  	 * related to the object. When transitioning from one set of domains
  	 * to another, the driver is called to ensure that caches are suitably
  	 * flushed and invalidated
  	 */
  	uint32_t read_domains;
  	uint32_t write_domain;
  
  	/**
  	 * While validating an exec operation, the
  	 * new read/write domain values are computed here.
  	 * They will be transferred to the above values
  	 * at the point that any cache flushing occurs
  	 */
  	uint32_t pending_read_domains;
  	uint32_t pending_write_domain;
  
  	void *driver_private;
  };

  #include "drm_crtc.h"

  /* per-master structure */
  struct drm_master {
  
  	struct kref refcount; /* refcount for this master */
  
  	struct list_head head; /**< each minor contains a list of masters */
  	struct drm_minor *minor; /**< link back to minor we are a master for */
  
  	char *unique;			/**< Unique identifier: e.g., busid */
  	int unique_len;			/**< Length of unique field */

  	int unique_size;		/**< amount allocated */

  
  	int blocked;			/**< Blocked due to VC switch? */
  
  	/** 
  ame Authentication */
  	/*@{ */
  	struct drm_open_hash magiclist;
  	struct list_head magicfree;
  	/*@} */
  
  	struct drm_lock_data lock;	/**< Information on hardware lock */
  
  	void *driver_priv; /**< Private structure for driver to use */
  };

  /* Size of ringbuffer for vblank timestamps. Just double-buffer
   * in initial implementation.
   */
  #define DRM_VBLANKTIME_RBSIZE 2
  
  /* Flags and return codes for get_vblank_timestamp() driver function. */
  #define DRM_CALLED_FROM_VBLIRQ 1
  #define DRM_VBLANKTIME_SCANOUTPOS_METHOD (1 << 0)
  #define DRM_VBLANKTIME_INVBL             (1 << 1)
  
  /* get_scanout_position() return flags */
  #define DRM_SCANOUTPOS_VALID        (1 << 0)
  #define DRM_SCANOUTPOS_INVBL        (1 << 1)
  #define DRM_SCANOUTPOS_ACCURATE     (1 << 2)

  struct drm_bus {
  	int bus_type;
  	int (*get_irq)(struct drm_device *dev);
  	const char *(*get_name)(struct drm_device *dev);
  	int (*set_busid)(struct drm_device *dev, struct drm_master *master);
  	int (*set_unique)(struct drm_device *dev, struct drm_master *master,
  			  struct drm_unique *unique);
  	int (*irq_by_busid)(struct drm_device *dev, struct drm_irq_busid *p);
  	/* hooks that are for PCI */
  	int (*agp_init)(struct drm_device *dev);
  
  };

  /**

   * DRM driver structure. This structure represent the common code for
   * a family of cards. There will one drm_device for each card present
   * in this family
   */

  struct drm_driver {

  	int (*load) (struct drm_device *, unsigned long flags);
  	int (*firstopen) (struct drm_device *);

  	int (*open) (struct drm_device *, struct drm_file *);

  	void (*preclose) (struct drm_device *, struct drm_file *file_priv);

  	void (*postclose) (struct drm_device *, struct drm_file *);

  	void (*lastclose) (struct drm_device *);
  	int (*unload) (struct drm_device *);

  	int (*suspend) (struct drm_device *, pm_message_t state);

  	int (*resume) (struct drm_device *);

  	int (*dma_ioctl) (struct drm_device *dev, void *data, struct drm_file *file_priv);

  	int (*dma_quiescent) (struct drm_device *);

  	int (*context_dtor) (struct drm_device *dev, int context);

  	/**

  	 * get_vblank_counter - get raw hardware vblank counter
  	 * @dev: DRM device
  	 * @crtc: counter to fetch
  	 *
  	 * Driver callback for fetching a raw hardware vblank counter
  	 * for @crtc.  If a device doesn't have a hardware counter, the
  	 * driver can simply return the value of drm_vblank_count and
  	 * make the enable_vblank() and disable_vblank() hooks into no-ops,
  	 * leaving interrupts enabled at all times.
  	 *
  	 * Wraparound handling and loss of events due to modesetting is dealt
  	 * with in the DRM core code.
  	 *
  	 * RETURNS
  	 * Raw vblank counter value.
  	 */
  	u32 (*get_vblank_counter) (struct drm_device *dev, int crtc);
  
  	/**
  	 * enable_vblank - enable vblank interrupt events
  	 * @dev: DRM device
  	 * @crtc: which irq to enable
  	 *
  	 * Enable vblank interrupts for @crtc.  If the device doesn't have
  	 * a hardware vblank counter, this routine should be a no-op, since
  	 * interrupts will have to stay on to keep the count accurate.
  	 *
  	 * RETURNS
  	 * Zero on success, appropriate errno if the given @crtc's vblank
  	 * interrupt cannot be enabled.
  	 */
  	int (*enable_vblank) (struct drm_device *dev, int crtc);
  
  	/**
  	 * disable_vblank - disable vblank interrupt events
  	 * @dev: DRM device
  	 * @crtc: which irq to enable
  	 *
  	 * Disable vblank interrupts for @crtc.  If the device doesn't have
  	 * a hardware vblank counter, this routine should be a no-op, since
  	 * interrupts will have to stay on to keep the count accurate.
  	 */
  	void (*disable_vblank) (struct drm_device *dev, int crtc);
  
  	/**

  	 * Called by \c drm_device_is_agp.  Typically used to determine if a
  	 * card is really attached to AGP or not.
  	 *
  	 * \param dev  DRM device handle
  	 *
  	 * \returns
  	 * One of three values is returned depending on whether or not the
  	 * card is absolutely \b not AGP (return of 0), absolutely \b is AGP
  	 * (return of 1), or may or may not be AGP (return of 2).
  	 */

  	int (*device_is_agp) (struct drm_device *dev);

  	/**
  	 * Called by vblank timestamping code.
  	 *
  	 * Return the current display scanout position from a crtc.
  	 *
  	 * \param dev  DRM device.
  	 * \param crtc Id of the crtc to query.
  	 * \param *vpos Target location for current vertical scanout position.
  	 * \param *hpos Target location for current horizontal scanout position.
  	 *
  	 * Returns vpos as a positive number while in active scanout area.
  	 * Returns vpos as a negative number inside vblank, counting the number
  	 * of scanlines to go until end of vblank, e.g., -1 means "one scanline
  	 * until start of active scanout / end of vblank."
  	 *
  	 * \return Flags, or'ed together as follows:
  	 *

  	 * DRM_SCANOUTPOS_VALID = Query successful.

  	 * DRM_SCANOUTPOS_INVBL = Inside vblank.
  	 * DRM_SCANOUTPOS_ACCURATE = Returned position is accurate. A lack of
  	 * this flag means that returned position may be offset by a constant
  	 * but unknown small number of scanlines wrt. real scanout position.
  	 *
  	 */
  	int (*get_scanout_position) (struct drm_device *dev, int crtc,
  				     int *vpos, int *hpos);
  
  	/**
  	 * Called by \c drm_get_last_vbltimestamp. Should return a precise
  	 * timestamp when the most recent VBLANK interval ended or will end.
  	 *
  	 * Specifically, the timestamp in @vblank_time should correspond as
  	 * closely as possible to the time when the first video scanline of
  	 * the video frame after the end of VBLANK will start scanning out,

  	 * the time immediately after end of the VBLANK interval. If the

  	 * @crtc is currently inside VBLANK, this will be a time in the future.
  	 * If the @crtc is currently scanning out a frame, this will be the
  	 * past start time of the current scanout. This is meant to adhere
  	 * to the OpenML OML_sync_control extension specification.
  	 *
  	 * \param dev dev DRM device handle.
  	 * \param crtc crtc for which timestamp should be returned.
  	 * \param *max_error Maximum allowable timestamp error in nanoseconds.
  	 *                   Implementation should strive to provide timestamp
  	 *                   with an error of at most *max_error nanoseconds.
  	 *                   Returns true upper bound on error for timestamp.
  	 * \param *vblank_time Target location for returned vblank timestamp.
  	 * \param flags 0 = Defaults, no special treatment needed.
  	 * \param       DRM_CALLED_FROM_VBLIRQ = Function is called from vblank
  	 *	        irq handler. Some drivers need to apply some workarounds
  	 *              for gpu-specific vblank irq quirks if flag is set.
  	 *
  	 * \returns
  	 * Zero if timestamping isn't supported in current display mode or a
  	 * negative number on failure. A positive status code on success,
  	 * which describes how the vblank_time timestamp was computed.
  	 */
  	int (*get_vblank_timestamp) (struct drm_device *dev, int crtc,
  				     int *max_error,
  				     struct timeval *vblank_time,
  				     unsigned flags);

  	/* these have to be filled in */

  	irqreturn_t(*irq_handler) (DRM_IRQ_ARGS);

  	void (*irq_preinstall) (struct drm_device *dev);

  	int (*irq_postinstall) (struct drm_device *dev);

  	void (*irq_uninstall) (struct drm_device *dev);

  	void (*reclaim_buffers) (struct drm_device *dev,
  				 struct drm_file * file_priv);

  	void (*reclaim_buffers_locked) (struct drm_device *dev,

  					struct drm_file *file_priv);

  	void (*reclaim_buffers_idlelocked) (struct drm_device *dev,

  					    struct drm_file *file_priv);

  	void (*set_version) (struct drm_device *dev,

  			     struct drm_set_version *sv);

  	/* Master routines */
  	int (*master_create)(struct drm_device *dev, struct drm_master *master);
  	void (*master_destroy)(struct drm_device *dev, struct drm_master *master);

  	/**
  	 * master_set is called whenever the minor master is set.
  	 * master_drop is called whenever the minor master is dropped.
  	 */
  
  	int (*master_set)(struct drm_device *dev, struct drm_file *file_priv,
  			  bool from_open);
  	void (*master_drop)(struct drm_device *dev, struct drm_file *file_priv,
  			    bool from_release);

  	int (*debugfs_init)(struct drm_minor *minor);
  	void (*debugfs_cleanup)(struct drm_minor *minor);

  
  	/**
  	 * Driver-specific constructor for drm_gem_objects, to set up
  	 * obj->driver_private.
  	 *
  	 * Returns 0 on success.
  	 */
  	int (*gem_init_object) (struct drm_gem_object *obj);
  	void (*gem_free_object) (struct drm_gem_object *obj);

  	int (*gem_open_object) (struct drm_gem_object *, struct drm_file *);
  	void (*gem_close_object) (struct drm_gem_object *, struct drm_file *);

  	/* vga arb irq handler */
  	void (*vgaarb_irq)(struct drm_device *dev, bool state);

  	/* dumb alloc support */
  	int (*dumb_create)(struct drm_file *file_priv,
  			   struct drm_device *dev,
  			   struct drm_mode_create_dumb *args);
  	int (*dumb_map_offset)(struct drm_file *file_priv,
  			       struct drm_device *dev, uint32_t handle,
  			       uint64_t *offset);
  	int (*dumb_destroy)(struct drm_file *file_priv,
  			    struct drm_device *dev,
  			    uint32_t handle);

  	/* Driver private ops for this object */
  	struct vm_operations_struct *gem_vm_ops;

  	int major;
  	int minor;
  	int patchlevel;
  	char *name;
  	char *desc;
  	char *date;

  	u32 driver_features;
  	int dev_priv_size;

  	struct drm_ioctl_desc *ioctls;

  	int num_ioctls;

  	const struct file_operations *fops;

  	union {
  		struct pci_driver *pci;
  		struct platform_device *platform_device;

  		struct usb_driver *usb;

  	} kdriver;
  	struct drm_bus *bus;

  	/* List of devices hanging off this driver */
  	struct list_head device_list;

  };

  #define DRM_MINOR_UNASSIGNED 0
  #define DRM_MINOR_LEGACY 1

  #define DRM_MINOR_CONTROL 2
  #define DRM_MINOR_RENDER 3

  
  /**
   * debugfs node list. This structure represents a debugfs file to
   * be created by the drm core
   */
  struct drm_debugfs_list {
  	const char *name; /** file name */
  	int (*show)(struct seq_file*, void*); /** show callback */
  	u32 driver_features; /**< Required driver features for this entry */
  };
  
  /**
   * debugfs node structure. This structure represents a debugfs file.
   */
  struct drm_debugfs_node {
  	struct list_head list;
  	struct drm_minor *minor;
  	struct drm_debugfs_list *debugfs_ent;
  	struct dentry *dent;
  };
  
  /**
   * Info file list entry. This structure represents a debugfs or proc file to
   * be created by the drm core
   */
  struct drm_info_list {
  	const char *name; /** file name */
  	int (*show)(struct seq_file*, void*); /** show callback */
  	u32 driver_features; /**< Required driver features for this entry */
  	void *data;
  };
  
  /**
   * debugfs node structure. This structure represents a debugfs file.
   */
  struct drm_info_node {
  	struct list_head list;
  	struct drm_minor *minor;
  	struct drm_info_list *info_ent;
  	struct dentry *dent;
  };

  /**

   * DRM minor structure. This structure represents a drm minor number.

   */

  struct drm_minor {
  	int index;			/**< Minor device number */
  	int type;                       /**< Control or render */
  	dev_t device;			/**< Device number for mknod */
  	struct device kdev;		/**< Linux device */

  	struct drm_device *dev;

  
  	struct proc_dir_entry *proc_root;  /**< proc directory entry */
  	struct drm_info_node proc_nodes;
  	struct dentry *debugfs_root;

  
  	struct list_head debugfs_list;
  	struct mutex debugfs_lock; /* Protects debugfs_list. */

  	struct drm_master *master; /* currently active master for this node */
  	struct list_head master_list;

  	struct drm_mode_group mode_group;

  };

  /* mode specified on the command line */
  struct drm_cmdline_mode {
  	bool specified;
  	bool refresh_specified;
  	bool bpp_specified;
  	int xres, yres;
  	int bpp;
  	int refresh;
  	bool rb;
  	bool interlace;
  	bool cvt;
  	bool margins;
  	enum drm_connector_force force;
  };

  struct drm_pending_vblank_event {
  	struct drm_pending_event base;
  	int pipe;
  	struct drm_event_vblank event;
  };

  /**
   * DRM device structure. This structure represent a complete card that
   * may contain multiple heads.
   */

  struct drm_device {

  	struct list_head driver_item;	/**< list of devices per driver */

  	char *devname;			/**< For /proc/interrupts */
  	int if_version;			/**< Highest interface version set */

  	/** 
  ame Locks */

  	/*@{ */
  	spinlock_t count_lock;		/**< For inuse, drm_device::open_count, drm_device::buf_use */

  	struct mutex struct_mutex;	/**< For others */

  	/*@} */

  
  	/** 
  ame Usage Counters */

  	/*@{ */
  	int open_count;			/**< Outstanding files open */
  	atomic_t ioctl_count;		/**< Outstanding IOCTLs pending */
  	atomic_t vma_count;		/**< Outstanding vma areas open */
  	int buf_use;			/**< Buffers in use -- cannot alloc */
  	atomic_t buf_alloc;		/**< Buffer allocation in progress */
  	/*@} */

  
  	/** 
  ame Performance counters */

  	/*@{ */
  	unsigned long counters;

  	enum drm_stat_type types[15];

  	atomic_t counts[15];
  	/*@} */

  	struct list_head filelist;

  
  	/** 
  ame Memory management */

  	/*@{ */

  	struct list_head maplist;	/**< Linked list of regions */

  	int map_count;			/**< Number of mappable regions */

  	struct drm_open_hash map_hash;	/**< User token hash table for maps */

  
  	/** 
  ame Context handle management */

  	/*@{ */

  	struct list_head ctxlist;	/**< Linked list of context handles */

  	int ctx_count;			/**< Number of context handles */

  	struct mutex ctxlist_mutex;	/**< For ctxlist */

  	struct idr ctx_idr;

  	struct list_head vmalist;	/**< List of vmas (for debugging) */

  	/*@} */

  
  	/** 
  ame DMA queues (contexts) */

  	/*@{ */
  	int queue_count;		/**< Number of active DMA queues */
  	int queue_reserved;		  /**< Number of reserved DMA queues */
  	int queue_slots;		/**< Actual length of queuelist */

  	struct drm_queue **queuelist;	/**< Vector of pointers to DMA queues */
  	struct drm_device_dma *dma;		/**< Optional pointer for DMA support */

  	/*@} */

  
  	/** 
  ame Context support */

  	/*@{ */

  	int irq_enabled;		/**< True if irq handler is enabled */

  	__volatile__ long context_flag;	/**< Context swapping flag */
  	__volatile__ long interrupt_flag; /**< Interruption handler flag */
  	__volatile__ long dma_flag;	/**< DMA dispatch flag */

  	wait_queue_head_t context_wait;	/**< Processes waiting on ctx switch */
  	int last_checked;		/**< Last context checked for DMA */
  	int last_context;		/**< Last current context */
  	unsigned long last_switch;	/**< jiffies at last context switch */
  	/*@} */
  
  	struct work_struct work;

  	/** 
  ame VBLANK IRQ support */

  	/*@{ */

  	/*
  	 * At load time, disabling the vblank interrupt won't be allowed since
  	 * old clients may not call the modeset ioctl and therefore misbehave.
  	 * Once the modeset ioctl *has* been called though, we can safely
  	 * disable them when unused.
  	 */
  	int vblank_disable_allowed;
  
  	wait_queue_head_t *vbl_queue;   /**< VBLANK wait queue */
  	atomic_t *_vblank_count;        /**< number of VBLANK interrupts (driver must alloc the right number of counters) */

  	struct timeval *_vblank_time;   /**< timestamp of current vblank_count (drivers must alloc right number of fields) */
  	spinlock_t vblank_time_lock;    /**< Protects vblank count and time updates during vblank enable/disable */

  	spinlock_t vbl_lock;

  	atomic_t *vblank_refcount;      /* number of users of vblank interruptsper crtc */
  	u32 *last_vblank;               /* protected by dev->vbl_lock, used */
  					/* for wraparound handling */
  	int *vblank_enabled;            /* so we don't call enable more than
  					   once per disable */
  	int *vblank_inmodeset;          /* Display driver is setting mode */

  	u32 *last_vblank_wait;		/* Last vblank seqno waited per CRTC */

  	struct timer_list vblank_disable_timer;
  
  	u32 max_vblank_count;           /**< size of vblank counter register */

  	/**
  	 * List of events
  	 */
  	struct list_head vblank_event_list;
  	spinlock_t event_lock;

  	/*@} */
  	cycles_t ctx_start;
  	cycles_t lck_start;

  	struct fasync_struct *buf_async;/**< Processes waiting for SIGIO */
  	wait_queue_head_t buf_readers;	/**< Processes waiting to read */
  	wait_queue_head_t buf_writers;	/**< Processes waiting to ctx switch */

  	struct drm_agp_head *agp;	/**< AGP data */

  	struct device *dev;             /**< Device structure */

  	struct pci_dev *pdev;		/**< PCI device structure */

  	int pci_vendor;			/**< PCI vendor id */
  	int pci_device;			/**< PCI device id */

  #ifdef __alpha__

  	struct pci_controller *hose;
  #endif

  
  	struct platform_device *platformdev; /**< Platform device struture */

  	struct usb_device *usbdev;

  	struct drm_sg_mem *sg;	/**< Scatter gather memory */

  	unsigned int num_crtcs;                  /**< Number of CRTCs on this device */

  	void *dev_private;		/**< device private data */

  	void *mm_private;
  	struct address_space *dev_mapping;

  	struct drm_sigdata sigdata;	   /**< For block_all_signals */

  	sigset_t sigmask;
  
  	struct drm_driver *driver;

  	struct drm_local_map *agp_buffer_map;

  	unsigned int agp_buffer_token;

  	struct drm_minor *control;		/**< Control node for card */

  	struct drm_minor *primary;		/**< render type primary screen head */

          struct drm_mode_config mode_config;	/**< Current mode config */

  	/** 
  ame GEM information */
  	/*@{ */
  	spinlock_t object_name_lock;
  	struct idr object_name_idr;

  	/*@} */

  	int switch_power_state;

  };

  #define DRM_SWITCH_POWER_ON 0
  #define DRM_SWITCH_POWER_OFF 1
  #define DRM_SWITCH_POWER_CHANGING 2

  static __inline__ int drm_core_check_feature(struct drm_device *dev,
  					     int feature)

  {
  	return ((dev->driver->driver_features & feature) ? 1 : 0);
  }

  static inline int drm_dev_to_irq(struct drm_device *dev)
  {

  	return dev->driver->bus->get_irq(dev);

  }

  #if __OS_HAS_AGP
  static inline int drm_core_has_AGP(struct drm_device *dev)
  {

  	return drm_core_check_feature(dev, DRIVER_USE_AGP);

  }
  #else
  #define drm_core_has_AGP(dev) (0)
  #endif
  
  #if __OS_HAS_MTRR
  static inline int drm_core_has_MTRR(struct drm_device *dev)
  {

  	return drm_core_check_feature(dev, DRIVER_USE_MTRR);

  }

  
  #define DRM_MTRR_WC		MTRR_TYPE_WRCOMB
  
  static inline int drm_mtrr_add(unsigned long offset, unsigned long size,
  			       unsigned int flags)
  {
  	return mtrr_add(offset, size, flags, 1);
  }
  
  static inline int drm_mtrr_del(int handle, unsigned long offset,
  			       unsigned long size, unsigned int flags)
  {
  	return mtrr_del(handle, offset, size);
  }

  #else
  #define drm_core_has_MTRR(dev) (0)

  
  #define DRM_MTRR_WC		0
  
  static inline int drm_mtrr_add(unsigned long offset, unsigned long size,
  			       unsigned int flags)
  {
  	return 0;
  }
  
  static inline int drm_mtrr_del(int handle, unsigned long offset,
  			       unsigned long size, unsigned int flags)
  {
  	return 0;
  }

  #endif
  
  /******************************************************************/
  /** 
  ame Internal function definitions */
  /*@{*/

  				/* Driver support (drm_drv.h) */

  extern long drm_ioctl(struct file *filp,
  		      unsigned int cmd, unsigned long arg);

  extern long drm_compat_ioctl(struct file *filp,
  			     unsigned int cmd, unsigned long arg);

  extern int drm_lastclose(struct drm_device *dev);

  
  				/* Device support (drm_fops.h) */

  extern struct mutex drm_global_mutex;

  extern int drm_open(struct inode *inode, struct file *filp);
  extern int drm_stub_open(struct inode *inode, struct file *filp);

  extern int drm_fasync(int fd, struct file *filp, int on);

  extern ssize_t drm_read(struct file *filp, char __user *buffer,
  			size_t count, loff_t *offset);

  extern int drm_release(struct inode *inode, struct file *filp);

  
  				/* Mapping support (drm_vm.h) */

  extern int drm_mmap(struct file *filp, struct vm_area_struct *vma);

  extern int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma);
  extern void drm_vm_open_locked(struct vm_area_struct *vma);

  extern void drm_vm_close_locked(struct vm_area_struct *vma);

  extern unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait);

  
  				/* Memory management support (drm_memory.h) */
  #include "drm_memory.h"

  extern void drm_mem_init(void);
  extern int drm_mem_info(char *buf, char **start, off_t offset,
  			int request, int *eof, void *data);
  extern void *drm_realloc(void *oldpt, size_t oldsize, size_t size, int area);

  extern void drm_free_agp(DRM_AGP_MEM * handle, int pages);

  extern int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start);

  extern DRM_AGP_MEM *drm_agp_bind_pages(struct drm_device *dev,
  				       struct page **pages,
  				       unsigned long num_pages,

  				       uint32_t gtt_offset,
  				       uint32_t type);

  extern int drm_unbind_agp(DRM_AGP_MEM * handle);

  
  				/* Misc. IOCTL support (drm_ioctl.h) */

  extern int drm_irq_by_busid(struct drm_device *dev, void *data,
  			    struct drm_file *file_priv);
  extern int drm_getunique(struct drm_device *dev, void *data,
  			 struct drm_file *file_priv);
  extern int drm_setunique(struct drm_device *dev, void *data,
  			 struct drm_file *file_priv);
  extern int drm_getmap(struct drm_device *dev, void *data,
  		      struct drm_file *file_priv);
  extern int drm_getclient(struct drm_device *dev, void *data,
  			 struct drm_file *file_priv);
  extern int drm_getstats(struct drm_device *dev, void *data,
  			struct drm_file *file_priv);

  extern int drm_getcap(struct drm_device *dev, void *data,
  		      struct drm_file *file_priv);

  extern int drm_setversion(struct drm_device *dev, void *data,
  			  struct drm_file *file_priv);
  extern int drm_noop(struct drm_device *dev, void *data,
  		    struct drm_file *file_priv);

  
  				/* Context IOCTL support (drm_context.h) */

  extern int drm_resctx(struct drm_device *dev, void *data,
  		      struct drm_file *file_priv);
  extern int drm_addctx(struct drm_device *dev, void *data,
  		      struct drm_file *file_priv);
  extern int drm_modctx(struct drm_device *dev, void *data,
  		      struct drm_file *file_priv);
  extern int drm_getctx(struct drm_device *dev, void *data,
  		      struct drm_file *file_priv);
  extern int drm_switchctx(struct drm_device *dev, void *data,
  			 struct drm_file *file_priv);
  extern int drm_newctx(struct drm_device *dev, void *data,
  		      struct drm_file *file_priv);
  extern int drm_rmctx(struct drm_device *dev, void *data,
  		     struct drm_file *file_priv);

  extern int drm_ctxbitmap_init(struct drm_device *dev);
  extern void drm_ctxbitmap_cleanup(struct drm_device *dev);
  extern void drm_ctxbitmap_free(struct drm_device *dev, int ctx_handle);

  extern int drm_setsareactx(struct drm_device *dev, void *data,
  			   struct drm_file *file_priv);
  extern int drm_getsareactx(struct drm_device *dev, void *data,
  			   struct drm_file *file_priv);

  				/* Authentication IOCTL support (drm_auth.h) */

  extern int drm_getmagic(struct drm_device *dev, void *data,
  			struct drm_file *file_priv);
  extern int drm_authmagic(struct drm_device *dev, void *data,
  			 struct drm_file *file_priv);

  /* Cache management (drm_cache.c) */
  void drm_clflush_pages(struct page *pages[], unsigned long num_pages);

  				/* Locking IOCTL support (drm_lock.h) */

  extern int drm_lock(struct drm_device *dev, void *data,
  		    struct drm_file *file_priv);
  extern int drm_unlock(struct drm_device *dev, void *data,
  		      struct drm_file *file_priv);

  extern int drm_lock_free(struct drm_lock_data *lock_data, unsigned int context);
  extern void drm_idlelock_take(struct drm_lock_data *lock_data);
  extern void drm_idlelock_release(struct drm_lock_data *lock_data);

  
  /*
   * These are exported to drivers so that they can implement fencing using
   * DMA quiscent + idle. DMA quiescent usually requires the hardware lock.
   */

  extern int drm_i_have_hw_lock(struct drm_device *dev, struct drm_file *file_priv);

  
  				/* Buffer management support (drm_bufs.h) */

  extern int drm_addbufs_agp(struct drm_device *dev, struct drm_buf_desc * request);
  extern int drm_addbufs_pci(struct drm_device *dev, struct drm_buf_desc * request);

  extern int drm_addmap(struct drm_device *dev, resource_size_t offset,

  		      unsigned int size, enum drm_map_type type,

  		      enum drm_map_flags flags, struct drm_local_map **map_ptr);

  extern int drm_addmap_ioctl(struct drm_device *dev, void *data,
  			    struct drm_file *file_priv);

  extern int drm_rmmap(struct drm_device *dev, struct drm_local_map *map);
  extern int drm_rmmap_locked(struct drm_device *dev, struct drm_local_map *map);

  extern int drm_rmmap_ioctl(struct drm_device *dev, void *data,
  			   struct drm_file *file_priv);
  extern int drm_addbufs(struct drm_device *dev, void *data,
  		       struct drm_file *file_priv);
  extern int drm_infobufs(struct drm_device *dev, void *data,
  			struct drm_file *file_priv);
  extern int drm_markbufs(struct drm_device *dev, void *data,
  			struct drm_file *file_priv);
  extern int drm_freebufs(struct drm_device *dev, void *data,
  			struct drm_file *file_priv);
  extern int drm_mapbufs(struct drm_device *dev, void *data,
  		       struct drm_file *file_priv);

  extern int drm_order(unsigned long size);

  
  				/* DMA support (drm_dma.h) */

  extern int drm_dma_setup(struct drm_device *dev);
  extern void drm_dma_takedown(struct drm_device *dev);

  extern void drm_free_buffer(struct drm_device *dev, struct drm_buf * buf);

  extern void drm_core_reclaim_buffers(struct drm_device *dev,
  				     struct drm_file *filp);

  
  				/* IRQ support (drm_irq.h) */

  extern int drm_control(struct drm_device *dev, void *data,
  		       struct drm_file *file_priv);

  extern irqreturn_t drm_irq_handler(DRM_IRQ_ARGS);

  extern int drm_irq_install(struct drm_device *dev);

  extern int drm_irq_uninstall(struct drm_device *dev);
  extern void drm_driver_irq_preinstall(struct drm_device *dev);
  extern void drm_driver_irq_postinstall(struct drm_device *dev);
  extern void drm_driver_irq_uninstall(struct drm_device *dev);

  extern int drm_vblank_init(struct drm_device *dev, int num_crtcs);

  extern int drm_wait_vblank(struct drm_device *dev, void *data,

  			   struct drm_file *filp);

  extern int drm_vblank_wait(struct drm_device *dev, unsigned int *vbl_seq);

  extern u32 drm_vblank_count(struct drm_device *dev, int crtc);

  extern u32 drm_vblank_count_and_time(struct drm_device *dev, int crtc,
  				     struct timeval *vblanktime);

  extern bool drm_handle_vblank(struct drm_device *dev, int crtc);

  extern int drm_vblank_get(struct drm_device *dev, int crtc);
  extern void drm_vblank_put(struct drm_device *dev, int crtc);

  extern void drm_vblank_off(struct drm_device *dev, int crtc);

  extern void drm_vblank_cleanup(struct drm_device *dev);

  extern u32 drm_get_last_vbltimestamp(struct drm_device *dev, int crtc,
  				     struct timeval *tvblank, unsigned flags);
  extern int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
  						 int crtc, int *max_error,
  						 struct timeval *vblank_time,
  						 unsigned flags,
  						 struct drm_crtc *refcrtc);
  extern void drm_calc_timestamping_constants(struct drm_crtc *crtc);

  extern bool
  drm_mode_parse_command_line_for_connector(const char *mode_option,
  					  struct drm_connector *connector,
  					  struct drm_cmdline_mode *mode);
  
  extern struct drm_display_mode *
  drm_mode_create_from_cmdline_mode(struct drm_device *dev,
  				  struct drm_cmdline_mode *cmd);

  /* Modesetting support */

  extern void drm_vblank_pre_modeset(struct drm_device *dev, int crtc);
  extern void drm_vblank_post_modeset(struct drm_device *dev, int crtc);

  extern int drm_modeset_ctl(struct drm_device *dev, void *data,
  			   struct drm_file *file_priv);

  
  				/* AGP/GART support (drm_agpsupport.h) */

  extern struct drm_agp_head *drm_agp_init(struct drm_device *dev);

  extern int drm_agp_acquire(struct drm_device *dev);

  extern int drm_agp_acquire_ioctl(struct drm_device *dev, void *data,
  				 struct drm_file *file_priv);

  extern int drm_agp_release(struct drm_device *dev);

  extern int drm_agp_release_ioctl(struct drm_device *dev, void *data,
  				 struct drm_file *file_priv);

  extern int drm_agp_enable(struct drm_device *dev, struct drm_agp_mode mode);

  extern int drm_agp_enable_ioctl(struct drm_device *dev, void *data,
  				struct drm_file *file_priv);
  extern int drm_agp_info(struct drm_device *dev, struct drm_agp_info *info);
  extern int drm_agp_info_ioctl(struct drm_device *dev, void *data,
  			struct drm_file *file_priv);

  extern int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request);

  extern int drm_agp_alloc_ioctl(struct drm_device *dev, void *data,
  			 struct drm_file *file_priv);

  extern int drm_agp_free(struct drm_device *dev, struct drm_agp_buffer *request);

  extern int drm_agp_free_ioctl(struct drm_device *dev, void *data,
  			struct drm_file *file_priv);

  extern int drm_agp_unbind(struct drm_device *dev, struct drm_agp_binding *request);

  extern int drm_agp_unbind_ioctl(struct drm_device *dev, void *data,
  			  struct drm_file *file_priv);

  extern int drm_agp_bind(struct drm_device *dev, struct drm_agp_binding *request);

  extern int drm_agp_bind_ioctl(struct drm_device *dev, void *data,
  			struct drm_file *file_priv);

  
  				/* Stub support (drm_stub.h) */

  extern int drm_setmaster_ioctl(struct drm_device *dev, void *data,
  			       struct drm_file *file_priv);
  extern int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
  				struct drm_file *file_priv);
  struct drm_master *drm_master_create(struct drm_minor *minor);
  extern struct drm_master *drm_master_get(struct drm_master *master);
  extern void drm_master_put(struct drm_master **master);

  extern void drm_put_dev(struct drm_device *dev);

  extern int drm_put_minor(struct drm_minor **minor);

  extern unsigned int drm_debug;

  extern unsigned int drm_vblank_offdelay;
  extern unsigned int drm_timestamp_precision;

  extern struct class *drm_class;

  extern struct proc_dir_entry *drm_proc_root;

  extern struct dentry *drm_debugfs_root;

  extern struct idr drm_minors_idr;

  extern struct drm_local_map *drm_getsarea(struct drm_device *dev);

  				/* Proc support (drm_proc.h) */

  extern int drm_proc_init(struct drm_minor *minor, int minor_id,
  			 struct proc_dir_entry *root);
  extern int drm_proc_cleanup(struct drm_minor *minor, struct proc_dir_entry *root);

  				/* Debugfs support */
  #if defined(CONFIG_DEBUG_FS)
  extern int drm_debugfs_init(struct drm_minor *minor, int minor_id,
  			    struct dentry *root);
  extern int drm_debugfs_create_files(struct drm_info_list *files, int count,
  				    struct dentry *root, struct drm_minor *minor);
  extern int drm_debugfs_remove_files(struct drm_info_list *files, int count,
                                      struct drm_minor *minor);
  extern int drm_debugfs_cleanup(struct drm_minor *minor);
  #endif
  
  				/* Info file support */
  extern int drm_name_info(struct seq_file *m, void *data);
  extern int drm_vm_info(struct seq_file *m, void *data);
  extern int drm_queues_info(struct seq_file *m, void *data);
  extern int drm_bufs_info(struct seq_file *m, void *data);
  extern int drm_vblank_info(struct seq_file *m, void *data);
  extern int drm_clients_info(struct seq_file *m, void* data);
  extern int drm_gem_name_info(struct seq_file *m, void *data);

  
  #if DRM_DEBUG_CODE
  extern int drm_vma_info(struct seq_file *m, void *data);
  #endif

  				/* Scatter Gather Support (drm_scatter.h) */

  extern void drm_sg_cleanup(struct drm_sg_mem * entry);

  extern int drm_sg_alloc_ioctl(struct drm_device *dev, void *data,
  			struct drm_file *file_priv);
  extern int drm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather * request);
  extern int drm_sg_free(struct drm_device *dev, void *data,
  		       struct drm_file *file_priv);

  			       /* ATI PCIGART support (ati_pcigart.h) */

  extern int drm_ati_pcigart_init(struct drm_device *dev,

  				struct drm_ati_pcigart_info * gart_info);

  extern int drm_ati_pcigart_cleanup(struct drm_device *dev,

  				   struct drm_ati_pcigart_info * gart_info);

  extern drm_dma_handle_t *drm_pci_alloc(struct drm_device *dev, size_t size,

  				       size_t align);

  extern void __drm_pci_free(struct drm_device *dev, drm_dma_handle_t * dmah);
  extern void drm_pci_free(struct drm_device *dev, drm_dma_handle_t * dmah);

  
  			       /* sysfs support (drm_sysfs.c) */

  struct drm_sysfs_class;

  extern struct class *drm_sysfs_create(struct module *owner, char *name);

  extern void drm_sysfs_destroy(void);

  extern int drm_sysfs_device_add(struct drm_minor *minor);

  extern void drm_sysfs_hotplug_event(struct drm_device *dev);

  extern void drm_sysfs_device_remove(struct drm_minor *minor);

  extern char *drm_get_connector_status_name(enum drm_connector_status status);
  extern int drm_sysfs_connector_add(struct drm_connector *connector);
  extern void drm_sysfs_connector_remove(struct drm_connector *connector);

  /* Graphics Execution Manager library functions (drm_gem.c) */
  int drm_gem_init(struct drm_device *dev);

  void drm_gem_destroy(struct drm_device *dev);

  void drm_gem_object_release(struct drm_gem_object *obj);

  void drm_gem_object_free(struct kref *kref);
  struct drm_gem_object *drm_gem_object_alloc(struct drm_device *dev,
  					    size_t size);

  int drm_gem_object_init(struct drm_device *dev,
  			struct drm_gem_object *obj, size_t size);

  int drm_gem_private_object_init(struct drm_device *dev,
  			struct drm_gem_object *obj, size_t size);

  void drm_gem_object_handle_free(struct drm_gem_object *obj);

  void drm_gem_vm_open(struct vm_area_struct *vma);
  void drm_gem_vm_close(struct vm_area_struct *vma);

  int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);

  #include "drm_global.h"

  static inline void
  drm_gem_object_reference(struct drm_gem_object *obj)
  {
  	kref_get(&obj->refcount);
  }
  
  static inline void
  drm_gem_object_unreference(struct drm_gem_object *obj)
  {

  	if (obj != NULL)
  		kref_put(&obj->refcount, drm_gem_object_free);
  }

  static inline void
  drm_gem_object_unreference_unlocked(struct drm_gem_object *obj)
  {

  	if (obj != NULL) {
  		struct drm_device *dev = obj->dev;
  		mutex_lock(&dev->struct_mutex);
  		kref_put(&obj->refcount, drm_gem_object_free);
  		mutex_unlock(&dev->struct_mutex);
  	}

  }
  
  int drm_gem_handle_create(struct drm_file *file_priv,
  			  struct drm_gem_object *obj,

  			  u32 *handlep);

  int drm_gem_handle_delete(struct drm_file *filp, u32 handle);

  
  static inline void
  drm_gem_object_handle_reference(struct drm_gem_object *obj)
  {
  	drm_gem_object_reference(obj);

  	atomic_inc(&obj->handle_count);

  }
  
  static inline void
  drm_gem_object_handle_unreference(struct drm_gem_object *obj)
  {
  	if (obj == NULL)
  		return;

  	if (atomic_read(&obj->handle_count) == 0)
  		return;

  	/*
  	 * Must bump handle count first as this may be the last
  	 * ref, in which case the object would disappear before we
  	 * checked for a name
  	 */

  	if (atomic_dec_and_test(&obj->handle_count))
  		drm_gem_object_handle_free(obj);

  	drm_gem_object_unreference(obj);
  }

  static inline void
  drm_gem_object_handle_unreference_unlocked(struct drm_gem_object *obj)
  {
  	if (obj == NULL)
  		return;

  	if (atomic_read(&obj->handle_count) == 0)
  		return;

  	/*
  	* Must bump handle count first as this may be the last
  	* ref, in which case the object would disappear before we
  	* checked for a name
  	*/

  
  	if (atomic_dec_and_test(&obj->handle_count))
  		drm_gem_object_handle_free(obj);

  	drm_gem_object_unreference_unlocked(obj);
  }

  void drm_gem_free_mmap_offset(struct drm_gem_object *obj);
  int drm_gem_create_mmap_offset(struct drm_gem_object *obj);

  struct drm_gem_object *drm_gem_object_lookup(struct drm_device *dev,
  					     struct drm_file *filp,

  					     u32 handle);

  int drm_gem_close_ioctl(struct drm_device *dev, void *data,
  			struct drm_file *file_priv);
  int drm_gem_flink_ioctl(struct drm_device *dev, void *data,
  			struct drm_file *file_priv);
  int drm_gem_open_ioctl(struct drm_device *dev, void *data,
  		       struct drm_file *file_priv);
  void drm_gem_open(struct drm_device *dev, struct drm_file *file_private);
  void drm_gem_release(struct drm_device *dev, struct drm_file *file_private);

  extern void drm_core_ioremap(struct drm_local_map *map, struct drm_device *dev);
  extern void drm_core_ioremap_wc(struct drm_local_map *map, struct drm_device *dev);
  extern void drm_core_ioremapfree(struct drm_local_map *map, struct drm_device *dev);

  static __inline__ struct drm_local_map *drm_core_findmap(struct drm_device *dev,
  							 unsigned int token)

  {

  	struct drm_map_list *_entry;

  	list_for_each_entry(_entry, &dev->maplist, head)

  	    if (_entry->user_token == token)
  		return _entry->map;

  	return NULL;
  }

  static __inline__ void drm_core_dropmap(struct drm_local_map *map)

  {

  }
  
  #include "drm_mem_util.h"

  extern int drm_fill_in_dev(struct drm_device *dev,
  			   const struct pci_device_id *ent,
  			   struct drm_driver *driver);
  int drm_get_minor(struct drm_device *dev, struct drm_minor **minor, int type);
  /*@}*/
  
  /* PCI section */
  static __inline__ int drm_pci_device_is_agp(struct drm_device *dev)
  {

  	if (dev->driver->device_is_agp != NULL) {
  		int err = (*dev->driver->device_is_agp) (dev);

  		if (err != 2) {
  			return err;
  		}
  	}
  
  	return pci_find_capability(dev->pdev, PCI_CAP_ID_AGP);
  }

  extern int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver);
  extern void drm_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver);
  extern int drm_get_pci_dev(struct pci_dev *pdev,

  			   const struct pci_device_id *ent,
  			   struct drm_driver *driver);

  
  
  /* platform section */
  extern int drm_platform_init(struct drm_driver *driver, struct platform_device *platform_device);
  extern void drm_platform_exit(struct drm_driver *driver, struct platform_device *platform_device);
  
  extern int drm_get_platform_dev(struct platform_device *pdev,
  				struct drm_driver *driver);

  /* returns true if currently okay to sleep */
  static __inline__ bool drm_can_sleep(void)
  {
  	if (in_atomic() || in_dbg_master() || irqs_disabled())
  		return false;
  	return true;
  }

  #endif				/* __KERNEL__ */

  #endif