summaryrefslogtreecommitdiff
path: root/linux-core/drmP.h
blob: 0d5f7b8f058129ba7cb7bbf07ab17d6bce11eaa0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
/* drmP.h -- Private header for Direct Rendering Manager -*- linux-c -*-
 * Created: Mon Jan  4 10:05:05 1999 by faith@precisioninsight.com
 * Revised: Mon Dec  6 16:06:49 1999 by faith@precisioninsight.com
 *
 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
 * All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 * 
 * $PI: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel/drmP.h,v 1.58 1999/08/30 13:05:00 faith Exp $
 * $XFree86: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel/drmP.h,v 1.1 1999/09/25 14:37:59 dawes Exp $
 * 
 */

#ifndef _DRM_P_H_
#define _DRM_P_H_

#ifdef __KERNEL__
#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/wrapper.h>
#include <linux/version.h>
#include <asm/io.h>
#include <asm/mman.h>
#include <asm/uaccess.h>
#ifdef CONFIG_MTRR
#include <asm/mtrr.h>
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,0)
#include <asm/spinlock.h>
#include <linux/poll.h>
#endif
#include "drm.h"

#define DRM_DEBUG_CODE 2	  /* Include debugging code (if > 1, then
				     also include looping detection. */
#define DRM_DMA_HISTOGRAM 1	  /* Make histogram of DMA latency. */

#define DRM_HASH_SIZE	      16 /* Size of key hash table		  */
#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_BSZ		      1024 /* Buffer size for /dev/drm? output	  */
#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_FLAG_NOCTX	  0x02

#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

				/* Backward compatibility section */
				/* _PAGE_WT changed to _PAGE_PWT in 2.2.6 */
#ifndef _PAGE_PWT
#define _PAGE_PWT _PAGE_WT
#endif
				/* Wait queue declarations changed in 2.3.1 */
#ifndef DECLARE_WAITQUEUE
#define DECLARE_WAITQUEUE(w,c) struct wait_queue w = { c, NULL }
typedef struct wait_queue *wait_queue_head_t;
#define init_waitqueue_head(q) *q = NULL;
#endif

				/* _PAGE_4M changed to _PAGE_PSE in 2.3.23 */
#ifndef _PAGE_PSE
#define _PAGE_PSE _PAGE_4M
#endif

				/* vm_offset changed to vm_pgoff in 2.3.25 */
#if LINUX_VERSION_CODE < 0x020319
#define VM_OFFSET(vma) ((vma)->vm_offset)
#else
#define VM_OFFSET(vma) ((vma)->vm_pgoff << PAGE_SHIFT)
#endif

				/* *_nopage return values defined in 2.3.26 */
#ifndef NOPAGE_SIGBUS
#define NOPAGE_SIGBUS 0
#endif
#ifndef NOPAGE_OOM
#define NOPAGE_OOM 0
#endif

				/* Generic cmpxchg added in 2.3.x */
#if CPU != 386
#ifndef __HAVE_ARCH_CMPXCHG
				/* Include this here so that driver can be
                                   used with older kernels. */
static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
				      unsigned long new, int size)
{
	unsigned long prev;
	switch (size) {
	case 1:
		__asm__ __volatile__(LOCK_PREFIX "cmpxchgb %b1,%2"
				     : "=a"(prev)
				     : "q"(new), "m"(*__xg(ptr)), "0"(old)
				     : "memory");
		return prev;
	case 2:
		__asm__ __volatile__(LOCK_PREFIX "cmpxchgw %w1,%2"
				     : "=a"(prev)
				     : "q"(new), "m"(*__xg(ptr)), "0"(old)
				     : "memory");
		return prev;
	case 4:
		__asm__ __volatile__(LOCK_PREFIX "cmpxchgl %1,%2"
				     : "=a"(prev)
				     : "q"(new), "m"(*__xg(ptr)), "0"(old)
				     : "memory");
		return prev;
	}
	return old;
}

#define cmpxchg(ptr,o,n)						\
  ((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),		\
				 (unsigned long)(n),sizeof(*(ptr))))
#endif
#else
				/* Compiling for a 386 proper... */
#error DRI not supported on Intel 80386
#endif

				/* Macros to make printk easier */
#define DRM_ERROR(fmt, arg...) \
	printk(KERN_ERR "[" DRM_NAME ":" __FUNCTION__ "] *ERROR* " fmt , ##arg)
#define DRM_MEM_ERROR(area, fmt, arg...) \
	printk(KERN_ERR "[" DRM_NAME ":" __FUNCTION__ ":%s] *ERROR* " fmt , \
	       drm_mem_stats[area].name , ##arg)
#define DRM_INFO(fmt, arg...)  printk(KERN_INFO "[" DRM_NAME "] " fmt , ##arg)

#if DRM_DEBUG_CODE
#define DRM_DEBUG(fmt, arg...)						  \
	do {								  \
		if (drm_flags&DRM_FLAG_DEBUG)				  \
			printk(KERN_DEBUG				  \
			       "[" DRM_NAME ":" __FUNCTION__ "] " fmt ,	  \
			       ##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) return len;

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

				/* Internal types and structures */
#define DRM_ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
#define DRM_MIN(a,b) ((a)<(b)?(a):(b))
#define DRM_MAX(a,b) ((a)>(b)?(a):(b))

#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)

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

typedef struct drm_ioctl_desc {
	drm_ioctl_t	     *func;
	int		     auth_needed;
	int		     root_only;
} drm_ioctl_desc_t;

typedef struct drm_devstate {
	pid_t		  owner;	/* X server pid holding x_lock */
	
} drm_devstate_t;

typedef struct drm_magic_entry {
	drm_magic_t	       magic;
	struct drm_file	       *priv;
	struct drm_magic_entry *next;
} drm_magic_entry_t;

typedef struct drm_magic_head {
       struct drm_magic_entry *head;
       struct drm_magic_entry *tail;
} drm_magic_head_t;

typedef struct drm_vma_entry {
	struct vm_area_struct *vma;
	struct drm_vma_entry  *next;
	pid_t		      pid;
} drm_vma_entry_t;

typedef 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		     */
	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		     */
	pid_t		  pid;	       /* PID of holding process	     */
	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		     */
#if DRM_DMA_HISTOGRAM
	cycles_t	  time_queued;	   /* Queued to kernel DMA queue     */
	cycles_t	  time_dispatched; /* Dispatched to hardware	     */
	cycles_t	  time_completed;  /* Completed by hardware	     */
	cycles_t	  time_freed;	   /* Back on freelist		     */
#endif
} drm_buf_t;

#if DRM_DMA_HISTOGRAM
#define DRM_DMA_HISTOGRAM_SLOTS		  9
#define DRM_DMA_HISTOGRAM_INITIAL	 10
#define DRM_DMA_HISTOGRAM_NEXT(current)	 ((current)*10)
typedef struct drm_histogram {
	atomic_t	  total;
	
	atomic_t	  queued_to_dispatched[DRM_DMA_HISTOGRAM_SLOTS];
	atomic_t	  dispatched_to_completed[DRM_DMA_HISTOGRAM_SLOTS];
	atomic_t	  completed_to_freed[DRM_DMA_HISTOGRAM_SLOTS];
	
	atomic_t	  queued_to_completed[DRM_DMA_HISTOGRAM_SLOTS];
	atomic_t	  queued_to_freed[DRM_DMA_HISTOGRAM_SLOTS];
	
	atomic_t	  dma[DRM_DMA_HISTOGRAM_SLOTS];
	atomic_t	  schedule[DRM_DMA_HISTOGRAM_SLOTS];
	atomic_t	  ctx[DRM_DMA_HISTOGRAM_SLOTS];
	atomic_t	  lacq[DRM_DMA_HISTOGRAM_SLOTS];
	atomic_t	  lhld[DRM_DMA_HISTOGRAM_SLOTS];
} drm_histogram_t;
#endif

				/* bufs is one longer than it has to be */
typedef struct drm_waitlist {
	int		  count;	/* Number of possible buffers	   */
	drm_buf_t	  **bufs;	/* List of pointers to buffers	   */
	drm_buf_t	  **rp;		/* Read pointer			   */
	drm_buf_t	  **wp;		/* Write pointer		   */
	drm_buf_t	  **end;	/* End pointer			   */
	spinlock_t	  read_lock;
	spinlock_t	  write_lock;
} drm_waitlist_t;

typedef struct drm_freelist {
	int		  initialized; /* Freelist in use		   */
	atomic_t	  count;       /* Number of free buffers	   */
	drm_buf_t	  *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	   */
} drm_freelist_t;

typedef struct drm_buf_entry {
	int		  buf_size;
	int		  buf_count;
	drm_buf_t	  *buflist;
	int		  seg_count;
	int		  page_order;
	unsigned long	  *seglist;

	drm_freelist_t	  freelist;
} drm_buf_entry_t;

typedef struct drm_hw_lock {
	__volatile__ unsigned int lock;
	char			  padding[60]; /* Pad to cache line */
} drm_hw_lock_t;

typedef struct drm_file {
	int		  authenticated;
	int		  minor;
	pid_t		  pid;
	uid_t		  uid;
	drm_magic_t	  magic;
	unsigned long	  ioctl_count;
	struct drm_file	  *next;
	struct drm_file	  *prev;
	struct drm_device *dev;
} drm_file_t;


typedef 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	    */
	drm_ctx_flags_t	  flags;	/* Context preserving and 2D-only   */
	drm_waitlist_t	  waitlist;	/* Pending buffers		    */
	wait_queue_head_t flush_queue;	/* Processes waiting until flush    */
} drm_queue_t;

typedef struct drm_lock_data {
	drm_hw_lock_t	  *hw_lock;	/* Hardware lock		   */
	pid_t		  pid;		/* PID 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	   */
} drm_lock_data_t;

typedef struct drm_device_dma {
				/* Performance Counters */
	atomic_t	  total_prio;	/* Total DRM_DMA_PRIORITY	   */
	atomic_t	  total_bytes;	/* Total bytes DMA'd		   */
	atomic_t	  total_dmas;	/* Total DMA buffers dispatched	   */
	
	atomic_t	  total_missed_dma;  /* Missed drm_do_dma	    */
	atomic_t	  total_missed_lock; /* Missed lock in drm_do_dma   */
	atomic_t	  total_missed_free; /* Missed drm_free_this_buffer */
	atomic_t	  total_missed_sched;/* Missed drm_dma_schedule	    */

	atomic_t	  total_tried;	/* Tried next_buffer		    */
	atomic_t	  total_hit;	/* Sent next_buffer		    */
	atomic_t	  total_lost;	/* Lost interrupt		    */

	drm_buf_entry_t	  bufs[DRM_MAX_ORDER+1];
	int		  buf_count;
	drm_buf_t	  **buflist;	/* Vector of pointers info bufs	   */
	int		  seg_count; 
	int		  page_count;
	unsigned long	  *pagelist;
	unsigned long	  byte_count;

				/* DMA support */
	drm_buf_t	  *this_buffer;	/* Buffer being sent		   */
	drm_buf_t	  *next_buffer; /* Selected buffer to send	   */
	drm_queue_t	  *next_queue;	/* Queue from which buffer selected*/
	wait_queue_head_t waiting;	/* Processes waiting on free bufs  */
} drm_device_dma_t;

typedef struct drm_device {
	const char	  *name;	/* Simple driver name		   */
	char		  *unique;	/* Unique identifier: e.g., busid  */
	int		  unique_len;	/* Length of unique field	   */
	dev_t		  device;	/* Device number for mknod	   */
	char		  *devname;	/* For /proc/interrupts		   */
	
	int		  blocked;	/* Blocked due to VC switch?	   */
	struct proc_dir_entry *root;	/* Root for this device's entries  */

				/* Locks */
	spinlock_t	  count_lock;	/* For inuse, open_count, buf_use  */
	struct semaphore  struct_sem;	/* For others			   */

				/* 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   */

				/* Performance Counters */
	atomic_t	  total_open;
	atomic_t	  total_close;
	atomic_t	  total_ioctl;
	atomic_t	  total_irq;	/* Total interruptions		   */
	atomic_t	  total_ctx;	/* Total context switches	   */
	
	atomic_t	  total_locks;
	atomic_t	  total_unlocks;
	atomic_t	  total_contends;
	atomic_t	  total_sleeps;

				/* Authentication */
	drm_file_t	  *file_first;
	drm_file_t	  *file_last;
	drm_magic_head_t  magiclist[DRM_HASH_SIZE];

				/* Memory management */
	drm_map_t	  **maplist;	/* Vector of pointers to regions   */
	int		  map_count;	/* Number of mappable regions	   */

	drm_vma_entry_t	  *vmalist;	/* List of vmas (for debugging)	   */
	drm_lock_data_t	  lock;		/* Information on hardware lock	   */

				/* 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	   */
	drm_queue_t	  **queuelist;	/* Vector of pointers to DMA queues */
	drm_device_dma_t  *dma;		/* Optional pointer for DMA support */

				/* Context support */
	int		  irq;		/* Interrupt used by board	   */
	__volatile__ int  context_flag;	 /* Context swapping flag	   */
	__volatile__ int  interrupt_flag;/* Interruption handler flag	   */
	__volatile__ int  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 tq_struct  tq;
	cycles_t	  ctx_start;
	cycles_t	  lck_start;
#if DRM_DMA_HISTOGRAM
	drm_histogram_t	  histo;
#endif
	
				/* Callback to X server for context switch
				   and for heavy-handed reset. */
	char		  buf[DRM_BSZ]; /* Output buffer		   */
	char		  *buf_rp;	/* Read pointer			   */
	char		  *buf_wp;	/* Write pointer		   */
	char		  *buf_end;	/* End pointer			   */
	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 */
} drm_device_t;


				/* Internal function definitions */

				/* Misc. support (init.c) */
extern int	     drm_flags;
extern void	     drm_parse_options(char *s);


				/* Device support (fops.c) */
extern int	     drm_open_helper(struct inode *inode, struct file *filp,
				     drm_device_t *dev);
extern int	     drm_flush(struct file *filp);
extern int	     drm_release(struct inode *inode, struct file *filp);
extern int	     drm_fasync(int fd, struct file *filp, int on);
extern ssize_t	     drm_read(struct file *filp, char *buf, size_t count,
			      loff_t *off);
extern int	     drm_write_string(drm_device_t *dev, const char *s);
extern unsigned int  drm_poll(struct file *filp, struct poll_table_struct *wait);

				/* Mapping support (vm.c) */
#if LINUX_VERSION_CODE < 0x020317
extern unsigned long drm_vm_nopage(struct vm_area_struct *vma,
				   unsigned long address,
				   int write_access);
extern unsigned long drm_vm_shm_nopage(struct vm_area_struct *vma,
				       unsigned long address,
				       int write_access);
extern unsigned long drm_vm_dma_nopage(struct vm_area_struct *vma,
				       unsigned long address,
				       int write_access);
#else
				/* Return type changed in 2.3.23 */
extern struct page *drm_vm_nopage(struct vm_area_struct *vma,
				  unsigned long address,
				  int write_access);
extern struct page *drm_vm_shm_nopage(struct vm_area_struct *vma,
				      unsigned long address,
				      int write_access);
extern struct page *drm_vm_dma_nopage(struct vm_area_struct *vma,
				      unsigned long address,
				      int write_access);
#endif
extern void	     drm_vm_open(struct vm_area_struct *vma);
extern void	     drm_vm_close(struct vm_area_struct *vma);
extern int	     drm_mmap_dma(struct file *filp,
				  struct vm_area_struct *vma);
extern int	     drm_mmap(struct file *filp, struct vm_area_struct *vma);


				/* Proc support (proc.c) */
extern int	     drm_proc_init(drm_device_t *dev);
extern int	     drm_proc_cleanup(void);

				/* Memory management support (memory.c) */
extern void	     drm_mem_init(void);
extern int	     drm_mem_info(char *buf, char **start, off_t offset,
				  int len, int *eof, void *data);
extern void	     *drm_alloc(size_t size, int area);
extern void	     *drm_realloc(void *oldpt, size_t oldsize, size_t size,
				  int area);
extern char	     *drm_strdup(const char *s, int area);
extern void	     drm_strfree(const char *s, int area);
extern void	     drm_free(void *pt, size_t size, int area);
extern unsigned long drm_alloc_pages(int order, int area);
extern void	     drm_free_pages(unsigned long address, int order,
				    int area);
extern void	     *drm_ioremap(unsigned long offset, unsigned long size);
extern void	     drm_ioremapfree(void *pt, unsigned long size);

				/* Buffer management support (bufs.c) */
extern int	     drm_order(unsigned long size);
extern int	     drm_addmap(struct inode *inode, struct file *filp,
				unsigned int cmd, unsigned long arg);
extern int	     drm_addbufs(struct inode *inode, struct file *filp,
				 unsigned int cmd, unsigned long arg);
extern int	     drm_infobufs(struct inode *inode, struct file *filp,
				  unsigned int cmd, unsigned long arg);
extern int	     drm_markbufs(struct inode *inode, struct file *filp,
				  unsigned int cmd, unsigned long arg);
extern int	     drm_freebufs(struct inode *inode, struct file *filp,
				  unsigned int cmd, unsigned long arg);
extern int	     drm_mapbufs(struct inode *inode, struct file *filp,
				 unsigned int cmd, unsigned long arg);


				/* Buffer list management support (lists.c) */
extern int	     drm_waitlist_create(drm_waitlist_t *bl, int count);
extern int	     drm_waitlist_destroy(drm_waitlist_t *bl);
extern int	     drm_waitlist_put(drm_waitlist_t *bl, drm_buf_t *buf);
extern drm_buf_t     *drm_waitlist_get(drm_waitlist_t *bl);

extern int	     drm_freelist_create(drm_freelist_t *bl, int count);
extern int	     drm_freelist_destroy(drm_freelist_t *bl);
extern int	     drm_freelist_put(drm_device_t *dev, drm_freelist_t *bl,
				      drm_buf_t *buf);
extern drm_buf_t     *drm_freelist_get(drm_freelist_t *bl, int block);

				/* DMA support (gen_dma.c) */
extern void	     drm_dma_setup(drm_device_t *dev);
extern void	     drm_dma_takedown(drm_device_t *dev);
extern void	     drm_free_buffer(drm_device_t *dev, drm_buf_t *buf);
extern void	     drm_reclaim_buffers(drm_device_t *dev, pid_t pid);
extern int	     drm_context_switch(drm_device_t *dev, int old, int new);
extern int	     drm_context_switch_complete(drm_device_t *dev, int new);
extern void	     drm_wakeup(drm_device_t *dev, drm_buf_t *buf);
extern void	     drm_clear_next_buffer(drm_device_t *dev);
extern int	     drm_select_queue(drm_device_t *dev,
				      void (*wrapper)(unsigned long));
extern int	     drm_dma_enqueue(drm_device_t *dev, drm_dma_t *dma);
extern int	     drm_dma_get_buffers(drm_device_t *dev, drm_dma_t *dma);
#if DRM_DMA_HISTOGRAM
extern int	     drm_histogram_slot(unsigned long count);
extern void	     drm_histogram_compute(drm_device_t *dev, drm_buf_t *buf);
#endif


				/* Misc. IOCTL support (ioctl.c) */
extern int	     drm_irq_busid(struct inode *inode, struct file *filp,
				   unsigned int cmd, unsigned long arg);
extern int	     drm_getunique(struct inode *inode, struct file *filp,
				   unsigned int cmd, unsigned long arg);
extern int	     drm_setunique(struct inode *inode, struct file *filp,
				   unsigned int cmd, unsigned long arg);


				/* Context IOCTL support (context.c) */
extern int	     drm_resctx(struct inode *inode, struct file *filp,
				unsigned int cmd, unsigned long arg);
extern int	     drm_addctx(struct inode *inode, struct file *filp,
				unsigned int cmd, unsigned long arg);
extern int	     drm_modctx(struct inode *inode, struct file *filp,
				unsigned int cmd, unsigned long arg);
extern int	     drm_getctx(struct inode *inode, struct file *filp,
				unsigned int cmd, unsigned long arg);
extern int	     drm_switchctx(struct inode *inode, struct file *filp,
				   unsigned int cmd, unsigned long arg);
extern int	     drm_newctx(struct inode *inode, struct file *filp,
				unsigned int cmd, unsigned long arg);
extern int	     drm_rmctx(struct inode *inode, struct file *filp,
			       unsigned int cmd, unsigned long arg);


				/* Drawable IOCTL support (drawable.c) */
extern int	     drm_adddraw(struct inode *inode, struct file *filp,
				 unsigned int cmd, unsigned long arg);
extern int	     drm_rmdraw(struct inode *inode, struct file *filp,
				unsigned int cmd, unsigned long arg);


				/* Authentication IOCTL support (auth.c) */
extern int	     drm_add_magic(drm_device_t *dev, drm_file_t *priv,
				   drm_magic_t magic);
extern int	     drm_remove_magic(drm_device_t *dev, drm_magic_t magic);
extern int	     drm_getmagic(struct inode *inode, struct file *filp,
				  unsigned int cmd, unsigned long arg);
extern int	     drm_authmagic(struct inode *inode, struct file *filp,
				   unsigned int cmd, unsigned long arg);


				/* Locking IOCTL support (lock.c) */
extern int	     drm_block(struct inode *inode, struct file *filp,
			       unsigned int cmd, unsigned long arg);
extern int	     drm_unblock(struct inode *inode, struct file *filp,
				 unsigned int cmd, unsigned long arg);
extern int	     drm_lock_take(__volatile__ unsigned int *lock,
				   unsigned int context);
extern int	     drm_lock_transfer(drm_device_t *dev,
				       __volatile__ unsigned int *lock,
				       unsigned int context);
extern int	     drm_lock_free(drm_device_t *dev,
				   __volatile__ unsigned int *lock,
				   unsigned int context);
extern int	     drm_finish(struct inode *inode, struct file *filp,
				unsigned int cmd, unsigned long arg);
extern int	     drm_flush_unblock(drm_device_t *dev, int context,
				       drm_lock_flags_t flags);
extern int	     drm_flush_block_and_flush(drm_device_t *dev, int context,
					       drm_lock_flags_t flags);
#endif
#endif