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drmP.h

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/**
 * \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/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

/***********************************************************************/
/** \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 , __FUNCTION__ , ##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 , __FUNCTION__, \
             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 ,   \
                         __FUNCTION__ , ##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( dev->lock.hw_lock->lock ) ||       \
           dev->lock.file_priv != file_priv )   {                 \
            DRM_ERROR( "%s called without lock held, held  %d owner %p %p\n",\
                     __FUNCTION__, _DRM_LOCK_IS_HELD( dev->lock.hw_lock->lock ),\
                     dev->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

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_magic_entry *next;
};

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;
      int master;
      int minor;
      pid_t pid;
      uid_t uid;
      drm_magic_t magic;
      unsigned long ioctl_count;
      struct list_head lhead;
      struct drm_head *head;
      int remove_auth_on_close;
      unsigned long lock_count;
      void *driver_priv;
      struct file *filp;
};

/** 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 */
#if 1
      atomic_t total_queued;        /**< Total queued statistic */
      atomic_t total_flushed;       /**< Total flushes statistic */
      atomic_t total_locks;         /**< Total locks statistics */
#endif
      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 */
      struct drm_file *file_priv;   /**< File descr of lock holder (0=kernel) */
      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;
};

/**
 * Mappings list
 */
struct drm_map_list {
      struct list_head head;        /**< list head */
      struct drm_hash_item hash;
      struct drm_map *map;                /**< mapping */
      unsigned int user_token;
};

typedef struct drm_map drm_local_map_t;

/**
 * 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 */
};

struct drm_vbl_sig {
      struct list_head head;
      unsigned int sequence;
      struct siginfo info;
      struct task_struct *task;
};

/* 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;
      drm_local_map_t mapping;
      int table_size;
};

/*
 * 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;
};

/**
 * 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 (*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 (*vblank_wait) (struct drm_device *dev, unsigned int *sequence);
      int (*vblank_wait2) (struct drm_device *dev, unsigned int *sequence);
      int (*dri_library_name) (struct drm_device *dev, char *buf);

      /**
       * 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);
      void (*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_map * map);
      unsigned long (*get_reg_ofs) (struct drm_device *dev);
      void (*set_version) (struct drm_device *dev,
                       struct drm_set_version *sv);

      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;
};

/**
 * DRM head structure. This structure represent a video head on a card
 * that may contain multiple heads. Embed one per head of these in the
 * private drm_device structure.
 */
struct drm_head {
      int minor;              /**< Minor device number */
      struct drm_device *dev;
      struct proc_dir_entry *dev_root;  /**< proc directory entry */
      dev_t device;                 /**< Device number for mknod */
      struct class_device *dev_class;
};

/**
 * DRM device structure. This structure represent a complete card that
 * may contain multiple heads.
 */
struct drm_device {
      char *unique;                 /**< Unique identifier: e.g., busid */
      int unique_len;               /**< Length of unique field */
      char *devname;                /**< For /proc/interrupts */
      int if_version;               /**< Highest interface version set */

      int blocked;                  /**< Blocked due to VC switch? */

      /** \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];
      /*@} */

      /** \name Authentication */
      /*@{ */
      struct list_head filelist;
      struct drm_open_hash magiclist;     /**< magic hash table */
      struct list_head magicfree;
      /*@} */

      /** \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) */
      struct drm_lock_data lock;    /**< Information on hardware lock */
      /*@} */

      /** \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;                /**< Interrupt used by board */
      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 */
      /*@{ */

      wait_queue_head_t vbl_queue;  /**< VBLANK wait queue */
      atomic_t vbl_received;
      atomic_t vbl_received2;       /**< number of secondary VBLANK interrupts */
      spinlock_t vbl_lock;
      struct list_head vbl_sigs;          /**< signal list to send on VBLANK */
      struct list_head vbl_sigs2;   /**< signals to send on secondary VBLANK */
      unsigned int vbl_pending;
      spinlock_t tasklet_lock;      /**< For drm_locked_tasklet */
      void (*locked_tasklet_func)(struct drm_device *dev);

      /*@} */
      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 */
      unsigned long *ctx_bitmap;    /**< context bitmap */
      void *dev_private;            /**< device private data */
      struct drm_sigdata sigdata;      /**< For block_all_signals */
      sigset_t sigmask;

      struct drm_driver *driver;
      drm_local_map_t *agp_buffer_map;
      unsigned int agp_buffer_token;
      struct drm_head primary;            /**< primary screen head */

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

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 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 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);

                        /* 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, drm_local_map_t ** 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, drm_local_map_t *map);
extern int drm_rmmap_locked(struct drm_device *dev, drm_local_map_t *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 unsigned long drm_get_resource_start(struct drm_device *dev,
                                  unsigned int resource);
extern unsigned long 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_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_wait_vblank(struct drm_device *dev, void *data,
                     struct drm_file *file_priv);
extern int drm_vblank_wait(struct drm_device *dev, unsigned int *vbl_seq);
extern void drm_vbl_send_signals(struct drm_device *dev);
extern void drm_locked_tasklet(struct drm_device *dev, void(*func)(struct drm_device*));

                        /* 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);

                        /* Stub support (drm_stub.h) */
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_head(struct drm_head *head);
extern unsigned int drm_debug;
extern unsigned int drm_cards_limit;
extern struct drm_head **drm_heads;
extern struct class *drm_class;
extern struct proc_dir_entry *drm_proc_root;

extern drm_local_map_t *drm_getsarea(struct drm_device *dev);

                        /* Proc support (drm_proc.h) */
extern int drm_proc_init(struct drm_device *dev,
                   int minor,
                   struct proc_dir_entry *root,
                   struct proc_dir_entry **dev_root);
extern int drm_proc_cleanup(int minor,
                      struct proc_dir_entry *root,
                      struct proc_dir_entry *dev_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) */
extern struct class *drm_sysfs_create(struct module *owner, char *name);
extern void drm_sysfs_destroy(struct class *cs);
extern struct class_device *drm_sysfs_device_add(struct class *cs,
                                     struct drm_head *head);
extern void drm_sysfs_device_remove(struct class_device *class_dev);

/*
 * 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);
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);

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

static __inline__ struct drm_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_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

/*@}*/

extern unsigned long drm_core_get_map_ofs(struct drm_map * map);
extern unsigned long drm_core_get_reg_ofs(struct drm_device *dev);

#endif                        /* __KERNEL__ */
#endif

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