drm: Split drm_map and drm_local_map

[deliverable/linux.git] / include / drm / drmP.h

/**
 * \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.
 * 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_

/* If you want the memory alloc debug functionality, change define below */
/* #define DEBUG_MEMORY */

#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/module.h>
#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/pci.h>
#include <linux/jiffies.h>
#include <linux/smp_lock.h>     /* For (un)lock_kernel */
#include <linux/dma-mapping.h>
#include <linux/mm.h>
#include <linux/cdev.h>
#include <linux/mutex.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 drm_file;
struct drm_device;

#include "drm_os_linux.h"
#include "drm_hashtab.h"

/***********************************************************************/
/** \name 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

/***********************************************************************/
/** \name 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_MEM_DMA        0
#define DRM_MEM_SAREA      1
#define DRM_MEM_DRIVER     2
#define DRM_MEM_MAGIC      3
#define DRM_MEM_IOCTLS     4
#define DRM_MEM_MAPS       5
#define DRM_MEM_VMAS       6
#define DRM_MEM_BUFS       7
#define DRM_MEM_SEGS       8
#define DRM_MEM_PAGES      9
#define DRM_MEM_FILES     10
#define DRM_MEM_QUEUES    11
#define DRM_MEM_CMDS      12
#define DRM_MEM_MAPPINGS  13
#define DRM_MEM_BUFLISTS  14
#define DRM_MEM_AGPLISTS  15
#define DRM_MEM_TOTALAGP  16
#define DRM_MEM_BOUNDAGP  17
#define DRM_MEM_CTXBITMAP 18
#define DRM_MEM_STUB      19
#define DRM_MEM_SGLISTS   20
#define DRM_MEM_CTXLIST   21
#define DRM_MEM_MM        22
#define DRM_MEM_HASHTAB   23

#define DRM_MAX_CTXBITMAP (PAGE_SIZE * 8)
#define DRM_MAP_HASH_OFFSET 0x10000000

/*@}*/

/***********************************************************************/
/** \name Macros to make printk easier */
/*@{*/

/**
 * Error output.
 *
 * \param fmt printf() like format string.
 * \param arg arguments
 */
#define DRM_ERROR(fmt, arg...) \
        printk(KERN_ERR "[" DRM_NAME ":%s] *ERROR* " fmt , __func__ , ##arg)

/**
 * Memory error output.
 *
 * \param area memory area where the error occurred.
 * \param fmt printf() like format string.
 * \param arg arguments
 */
#define DRM_MEM_ERROR(area, fmt, arg...) \
        printk(KERN_ERR "[" DRM_NAME ":%s:%s] *ERROR* " fmt , __func__, \
               drm_mem_stats[area].name , ##arg)

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

/**
 * Debug output.
 *
 * \param fmt printf() like format string.
 * \param arg arguments
 */
#if DRM_DEBUG_CODE
#define DRM_DEBUG(fmt, arg...)                                          \
        do {                                                            \
                if ( drm_debug )                        \
                        printk(KERN_DEBUG                               \
                               "[" DRM_NAME ":%s] " fmt ,       \
                               __func__ , ##arg);                       \
        } while (0)
#else
#define DRM_DEBUG(fmt, arg...)           do { } while (0)
#endif

#define DRM_PROC_LIMIT (PAGE_SIZE-80)

#define DRM_PROC_PRINT(fmt, arg...)                                     \
   len += sprintf(&buf[len], fmt , ##arg);                              \
   if (len > DRM_PROC_LIMIT) { *eof = 1; return len - offset; }

#define DRM_PROC_PRINT_RET(ret, fmt, arg...)                            \
   len += sprintf(&buf[len], fmt , ##arg);                              \
   if (len > DRM_PROC_LIMIT) { ret; *eof = 1; return len - offset; }

/*@}*/

/***********************************************************************/
/** \name 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_WAITCOUNT(dev,idx) DRM_BUFCOUNT(&dev->queuelist[idx]->waitlist)

#define DRM_IF_VERSION(maj, min) (maj << 16 | min)
/**
 * Get the private SAREA mapping.
 *
 * \param _dev DRM device.
 * \param _ctx context number.
 * \param _map output mapping.
 */
#define DRM_GET_PRIV_SAREA(_dev, _ctx, _map) do {       \
        (_map) = (_dev)->context_sareas[_ctx];          \
} while(0)

/**
 * 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\n",\
                           __func__, _DRM_LOCK_IS_HELD(file_priv->master->lock.hw_lock->lock),\
                           file_priv->master->lock.file_priv, file_priv);               \
                return -EINVAL;                                         \
        }                                                               \
} while (0)

/**
 * Copy and IOCTL return string to user space
 */
#define DRM_COPY( name, value )                                         \
        len = strlen( value );                                          \
        if ( len > name##_len ) len = name##_len;                       \
        name##_len = strlen( value );                                   \
        if ( len && name ) {                                            \
                if ( copy_to_user( name, value, len ) )                 \
                        return -EFAULT;                                 \
        }

/**
 * 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_AUTH        0x1
#define DRM_MASTER      0x2
#define DRM_ROOT_ONLY   0x4
#define DRM_CONTROL_ALLOW 0x8

struct drm_ioctl_desc {
        unsigned int cmd;
        drm_ioctl_t *func;
        int flags;
};

/**
 * Creates a driver or general drm_ioctl_desc array entry for the given
 * ioctl, for use by drm_ioctl().
 */
#define DRM_IOCTL_DEF(ioctl, func, flags) \
        [DRM_IOCTL_NR(ioctl)] = {ioctl, func, flags}

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;
};

/** 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 */
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;
};


/*
 * Generic memory manager structs
 */

struct drm_mm_node {
        struct list_head fl_entry;
        struct list_head ml_entry;
        int free;
        unsigned long start;
        unsigned long size;
        struct drm_mm *mm;
        void *private;
};

struct drm_mm {
        struct list_head fl_entry;
        struct list_head ml_entry;
};


/**
 * Kernel side of a mapping
 */
struct drm_local_map {
        unsigned long 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 */
        struct kref handlecount;

        /** 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? */

        /** \name 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 */
};

/**
 * 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);
        void (*dma_ready) (struct drm_device *);
        int (*dma_quiescent) (struct drm_device *);
        int (*context_ctor) (struct drm_device *dev, int context);
        int (*context_dtor) (struct drm_device *dev, int context);
        int (*kernel_context_switch) (struct drm_device *dev, int old,
                                      int new);
        void (*kernel_context_switch_unlock) (struct drm_device *dev);
        int (*dri_library_name) (struct drm_device *dev, char *buf);

        /**
         * 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);

        /* 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);
        unsigned long (*get_map_ofs) (struct drm_local_map * map);
        unsigned long (*get_reg_ofs) (struct drm_device *dev);
        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);

        int (*proc_init)(struct drm_minor *minor);
        void (*proc_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);

        /* 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;
        struct file_operations fops;
        struct pci_driver pci_driver;
        /* 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

/**
 * 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 *dev_root;  /**< proc directory entry */
        struct drm_master *master; /* currently active master for this node */
        struct list_head master_list;
        struct drm_mode_group mode_group;
};

/**
 * 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 */

        /** \name Locks */
        /*@{ */
        spinlock_t count_lock;          /**< For inuse, drm_device::open_count, drm_device::buf_use */
        struct mutex struct_mutex;      /**< For others */
        /*@} */

        /** \name 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 */
        /*@} */

        /** \name Performance counters */
        /*@{ */
        unsigned long counters;
        enum drm_stat_type types[15];
        atomic_t counts[15];
        /*@} */

        struct list_head filelist;

        /** \name 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 */

        /** \name 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) */

        /*@} */

        /** \name 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 */
        /*@} */

        /** \name 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 */
        struct timer_list timer;        /**< Timer for delaying ctx switch */
        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;
        /** \name 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) */
        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 */

        /*@} */
        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 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 drm_sg_mem *sg;  /**< Scatter gather memory */
        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 */

        /** \name Drawable information */
        /*@{ */
        spinlock_t drw_lock;
        struct idr drw_idr;
        /*@} */

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

        /** \name GEM information */
        /*@{ */
        spinlock_t object_name_lock;
        struct idr object_name_idr;
        atomic_t object_count;
        atomic_t object_memory;
        atomic_t pin_count;
        atomic_t pin_memory;
        atomic_t gtt_count;
        atomic_t gtt_memory;
        uint32_t gtt_total;
        uint32_t invalidate_domains;    /* domains pending invalidation */
        uint32_t flush_domains;         /* domains pending flush */
        /*@} */

};

static inline int drm_dev_to_irq(struct drm_device *dev)
{
        return dev->pdev->irq;
}

static __inline__ int drm_core_check_feature(struct drm_device *dev,
                                             int feature)
{
        return ((dev->driver->driver_features & feature) ? 1 : 0);
}

#ifdef __alpha__
#define drm_get_pci_domain(dev) dev->hose->index
#else
#define drm_get_pci_domain(dev) 0
#endif

#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

/******************************************************************/
/** \name Internal function definitions */
/*@{*/

                                /* Driver support (drm_drv.h) */
extern int drm_init(struct drm_driver *driver);
extern void drm_exit(struct drm_driver *driver);
extern int drm_ioctl(struct inode *inode, 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 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 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 unsigned long drm_core_get_map_ofs(struct drm_local_map * map);
extern unsigned long drm_core_get_reg_ofs(struct drm_device *dev);
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 DRM_AGP_MEM *drm_alloc_agp(struct drm_device *dev, int pages, u32 type);
extern int 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_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);

                                /* Drawable IOCTL support (drm_drawable.h) */
extern int drm_adddraw(struct drm_device *dev, void *data,
                       struct drm_file *file_priv);
extern int drm_rmdraw(struct drm_device *dev, void *data,
                      struct drm_file *file_priv);
extern int drm_update_drawable_info(struct drm_device *dev, void *data,
                                    struct drm_file *file_priv);
extern struct drm_drawable_info *drm_get_drawable_info(struct drm_device *dev,
                                                  drm_drawable_t id);
extern void drm_drawable_free_all(struct drm_device *dev);

                                /* 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_take(struct drm_lock_data *lock_data, unsigned int context);
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, unsigned int 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);
extern resource_size_t drm_get_resource_start(struct drm_device *dev,
                                              unsigned int resource);
extern resource_size_t drm_get_resource_len(struct drm_device *dev,
                                            unsigned int resource);

                                /* 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 void 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_cleanup(struct drm_device *dev);
/* 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);
extern DRM_AGP_MEM *drm_agp_allocate_memory(struct agp_bridge_data *bridge, size_t pages, u32 type);
extern int drm_agp_free_memory(DRM_AGP_MEM * handle);
extern int drm_agp_bind_memory(DRM_AGP_MEM * handle, off_t start);
extern int drm_agp_unbind_memory(DRM_AGP_MEM * handle);
extern void drm_agp_chipset_flush(struct drm_device *dev);

                                /* 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 int drm_get_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
                       struct drm_driver *driver);
extern int drm_put_dev(struct drm_device *dev);
extern int drm_put_minor(struct drm_minor **minor);
extern unsigned int drm_debug;

extern struct class *drm_class;
extern struct proc_dir_entry *drm_proc_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);

                                /* 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, dma_addr_t maxaddr);
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);

/*
 * Basic memory manager support (drm_mm.c)
 */
extern struct drm_mm_node *drm_mm_get_block(struct drm_mm_node * parent,
                                       unsigned long size,
                                       unsigned alignment);
extern void drm_mm_put_block(struct drm_mm_node * cur);
extern struct drm_mm_node *drm_mm_search_free(const struct drm_mm *mm, unsigned long size,
                                         unsigned alignment, int best_match);
extern int drm_mm_init(struct drm_mm *mm, unsigned long start, unsigned long size);
extern void drm_mm_takedown(struct drm_mm *mm);
extern int drm_mm_clean(struct drm_mm *mm);
extern unsigned long drm_mm_tail_space(struct drm_mm *mm);
extern int drm_mm_remove_space_from_tail(struct drm_mm *mm, unsigned long size);
extern int drm_mm_add_space_to_tail(struct drm_mm *mm, unsigned long size);

/* 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_free(struct kref *kref);
struct drm_gem_object *drm_gem_object_alloc(struct drm_device *dev,
                                            size_t size);
void drm_gem_object_handle_free(struct kref *kref);
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);

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)
                return;

        kref_put(&obj->refcount, drm_gem_object_free);
}

int drm_gem_handle_create(struct drm_file *file_priv,
                          struct drm_gem_object *obj,
                          int *handlep);

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

static inline void
drm_gem_object_handle_unreference(struct drm_gem_object *obj)
{
        if (obj == NULL)
                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
         */
        kref_put(&obj->handlecount, drm_gem_object_handle_free);
        drm_gem_object_unreference(obj);
}

struct drm_gem_object *drm_gem_object_lookup(struct drm_device *dev,
                                             struct drm_file *filp,
                                             int 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__ int drm_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);
}

static __inline__ int drm_device_is_pcie(struct drm_device *dev)
{
        return pci_find_capability(dev->pdev, PCI_CAP_ID_EXP);
}

static __inline__ void drm_core_dropmap(struct drm_local_map *map)
{
}

#ifndef DEBUG_MEMORY
/** Wrapper around kmalloc() */
static __inline__ void *drm_alloc(size_t size, int area)
{
        return kmalloc(size, GFP_KERNEL);
}

/** Wrapper around kfree() */
static __inline__ void drm_free(void *pt, size_t size, int area)
{
        kfree(pt);
}

/** Wrapper around kcalloc() */
static __inline__ void *drm_calloc(size_t nmemb, size_t size, int area)
{
        return kcalloc(nmemb, size, GFP_KERNEL);
}
#else
extern void *drm_alloc(size_t size, int area);
extern void drm_free(void *pt, size_t size, int area);
extern void *drm_calloc(size_t nmemb, size_t size, int area);
#endif

/*@}*/

#endif                          /* __KERNEL__ */
#endif