aboutsummaryrefslogtreecommitdiff
path: root/linux/drmP.h
blob: 5626e4ff04c478079a7f41209602773a88dd8da5 (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
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
/**
 * \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_


#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/config.h>
#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 <linux/sched.h>
#include <linux/smp_lock.h>	/* For (un)lock_kernel */
#include <linux/mm.h>
#include <linux/pagemap.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
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,41)
#define HAS_WORKQUEUE 0
#else
#define HAS_WORKQUEUE 1
#endif
#if !HAS_WORKQUEUE
#include <linux/tqueue.h>
#else
#include <linux/workqueue.h>
#endif
#include <linux/poll.h>
#include <asm/pgalloc.h>
#include "drm.h"

#include "drm_os_linux.h"


/***********************************************************************/
/** \name DRM template customization defaults */
/*@{*/

#ifndef __HAVE_AGP
#define __HAVE_AGP		0
#endif
#ifndef __HAVE_MTRR
#define __HAVE_MTRR		0
#endif
#ifndef __HAVE_CTX_BITMAP
#define __HAVE_CTX_BITMAP	0
#endif
#ifndef __HAVE_DMA
#define __HAVE_DMA		0
#endif
#ifndef __HAVE_DMA_IRQ
#define __HAVE_DMA_IRQ		0
#endif
#ifndef __HAVE_DMA_WAITLIST
#define __HAVE_DMA_WAITLIST	0
#endif
#ifndef __HAVE_DMA_FREELIST
#define __HAVE_DMA_FREELIST	0
#endif

#define __REALLY_HAVE_AGP	(__HAVE_AGP && (defined(CONFIG_AGP) || \
						defined(CONFIG_AGP_MODULE)))
#define __REALLY_HAVE_MTRR	(__HAVE_MTRR && defined(CONFIG_MTRR))
#define __REALLY_HAVE_SG	(__HAVE_SG)

/*@}*/


/***********************************************************************/
/** \name Begin the DRM... */
/*@{*/

#define DRM_DEBUG_CODE 2	  /**< Include debugging code if > 1, then
				     also include looping detection. */

#define DRM_HASH_SIZE	      16 /**< 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_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_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_MAX_CTXBITMAP (PAGE_SIZE * 8)
	
/*@}*/


/***********************************************************************/
/** \name Backward compatibility section */
/*@{*/

#ifndef minor
#define minor(x) MINOR((x))
#endif

#ifndef MODULE_LICENSE
#define MODULE_LICENSE(x) 
#endif

#ifndef preempt_disable
#define preempt_disable()
#define preempt_enable()
#endif

#ifndef pte_offset_map 
#define pte_offset_map pte_offset
#define pte_unmap(pte)
#endif

#ifndef list_for_each_safe
#define list_for_each_safe(pos, n, head)				\
	for (pos = (head)->next, n = pos->next; pos != (head);		\
		pos = n, n = pos->next)
#endif

#ifndef list_for_each_entry
#define list_for_each_entry(pos, head, member)				\
       for (pos = list_entry((head)->next, typeof(*pos), member),	\
                    prefetch(pos->member.next);				\
            &pos->member != (head);					\
            pos = list_entry(pos->member.next, typeof(*pos), member),	\
                    prefetch(pos->member.next))
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,19)
static inline struct page * vmalloc_to_page(void * vmalloc_addr)
{
	unsigned long addr = (unsigned long) vmalloc_addr;
	struct page *page = NULL;
	pgd_t *pgd = pgd_offset_k(addr);
	pmd_t *pmd;
	pte_t *ptep, pte;
  
	if (!pgd_none(*pgd)) {
		pmd = pmd_offset(pgd, addr);
		if (!pmd_none(*pmd)) {
			preempt_disable();
			ptep = pte_offset_map(pmd, addr);
			pte = *ptep;
			if (pte_present(pte))
				page = pte_page(pte);
			pte_unmap(ptep);
			preempt_enable();
		}
	}
	return page;
}
#endif

#ifndef REMAP_PAGE_RANGE_5_ARGS
#define DRM_RPR_ARG(vma)
#else
#define DRM_RPR_ARG(vma) vma,
#endif

#define VM_OFFSET(vma) ((vma)->vm_pgoff << PAGE_SHIFT)

/*@}*/


/***********************************************************************/
/** \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(flags) & DRM_FLAG_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 Mapping helper macros */
/*@{*/

#define DRM_IOREMAP(map, dev)							\
	(map)->handle = DRM(ioremap)( (map)->offset, (map)->size, (dev) )

#define DRM_IOREMAP_NOCACHE(map, dev)						\
	(map)->handle = DRM(ioremap_nocache)((map)->offset, (map)->size, (dev))

#define DRM_IOREMAPFREE(map, dev)						\
	do {									\
		if ( (map)->handle && (map)->size )				\
			DRM(ioremapfree)( (map)->handle, (map)->size, (dev) );	\
	} while (0)

/**
 * Find mapping.
 *
 * \param _map matching mapping if found, untouched otherwise.
 * \param _o offset.
 *
 * Expects the existence of a local variable named \p dev pointing to the
 * drm_device structure.
 */
#define DRM_FIND_MAP(_map, _o)								\
do {											\
	struct list_head *_list;							\
	list_for_each( _list, &dev->maplist->head ) {					\
		drm_map_list_t *_entry = list_entry( _list, drm_map_list_t, head );	\
		if ( _entry->map &&							\
		     _entry->map->offset == (_o) ) {					\
			(_map) = _entry->map;						\
			break;								\
 		}									\
	}										\
} while(0)

/**
 * Drop mapping.
 *
 * \sa #DRM_FIND_MAP.
 */
#define DRM_DROP_MAP(_map)

/*@}*/


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

/**
 * 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, filp )				\
do {									\
	if ( !_DRM_LOCK_IS_HELD( dev->lock.hw_lock->lock ) ||		\
	     dev->lock.filp != filp ) {				\
		DRM_ERROR( "%s called without lock held\n",		\
			   __FUNCTION__ );				\
		return -EINVAL;						\
	}								\
} while (0)

/**
 * Ioctl function type.
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg argument.
 */
typedef int drm_ioctl_t( struct inode *inode, struct file *filp,
			 unsigned int cmd, unsigned long arg );

typedef struct drm_pci_list {
	u16 vendor;
	u16 device;
} drm_pci_list_t;

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;

/**
 * DMA buffer.
 */
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 */
	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 file       *filp;       /**< Pointer to 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 */
} drm_buf_t;


/** 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 */
	spinlock_t        lock;
} drm_freelist_t;

/**
 * Buffer entry.  There is one of this for each buffer size order.
 */
typedef struct drm_buf_entry {
	int		  buf_size;	/**< size */
	int		  buf_count;	/**< number of buffers */
	drm_buf_t	  *buflist;	/**< buffer list */
	int		  seg_count;
	int		  page_order;
	unsigned long	  *seglist;

	drm_freelist_t	  freelist;
} drm_buf_entry_t;

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

/** File private data */
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;
	int 		  remove_auth_on_close;
	unsigned long     lock_count;
} drm_file_t;

/** Wait queue */
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 */
#if 1
	atomic_t	  total_queued;	/**< Total queued statistic */
	atomic_t	  total_flushed;/**< Total flushes statistic */
	atomic_t	  total_locks;	/**< Total locks statistics */
#endif
	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;

/**
 * Lock data.
 */
typedef struct drm_lock_data {
	drm_hw_lock_t	  *hw_lock;	/**< Hardware lock */
	struct file       *filp;	/**< 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 */
} drm_lock_data_t;

/**
 * DMA data.
 */
typedef struct drm_device_dma {

	drm_buf_entry_t	  bufs[DRM_MAX_ORDER+1];	/**< buffers, grouped by their size order */
	int		  buf_count;	/**< total number of buffers */
	drm_buf_t	  **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
	} flags;

	/** \name 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;

#if __REALLY_HAVE_AGP
/** 
 * AGP memory entry.  Stored as a doubly linked list.
 */
typedef struct drm_agp_mem {
	unsigned long      handle;	/**< handle */
	agp_memory         *memory;	
	unsigned long      bound;	/**< address */
	int                pages;
	struct drm_agp_mem *prev;	/**< previous entry */
	struct drm_agp_mem *next;	/**< next entry */
} drm_agp_mem_t;

/**
 * AGP data.
 *
 * \sa DRM(agp_init)() and drm_device::agp.
 */
typedef struct drm_agp_head {
	agp_kern_info      agp_info;	/**< AGP device information */
	drm_agp_mem_t      *memory;	/**< memory entries */
	unsigned long      mode;	/**< AGP mode */
	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;
} drm_agp_head_t;
#endif

/**
 * Scatter-gather memory.
 */
typedef struct drm_sg_mem {
	unsigned long   handle;
	void            *virtual;
	int             pages;
	struct page     **pagelist;
	dma_addr_t	*busaddr;
} drm_sg_mem_t;

typedef struct drm_sigdata {
	int           context;
	drm_hw_lock_t *lock;
} drm_sigdata_t;

/**
 * Mappings list
 */
typedef struct drm_map_list {
	struct list_head	head;	/**< list head */
	drm_map_t		*map;	/**< mapping */
} drm_map_list_t;

typedef drm_map_t drm_local_map_t;

#if __HAVE_VBL_IRQ

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

#endif

/**
 * DRM device structure.
 */
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 */

	/** \name Locks */
	/*@{*/
	spinlock_t	  count_lock;	/**< For inuse, drm_device::open_count, drm_device::buf_use */
	struct semaphore  struct_sem;	/**< 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;
	drm_stat_type_t   types[15];
	atomic_t          counts[15];
	/*@}*/

	/** \name Authentication */
	/*@{*/
	drm_file_t	  *file_first;	/**< file list head */
	drm_file_t	  *file_last;	/**< file list tail */
	drm_magic_head_t  magiclist[DRM_HASH_SIZE];	/**< magic hash table */
	/*@}*/

	/** \name Memory management */
	/*@{*/
	drm_map_list_t	  *maplist;	/**< Linked list of regions */
	int		  map_count;	/**< Number of mappable regions */

	drm_map_t	  **context_sareas; /**< per-context SAREA's */
	int		  max_context;

	drm_vma_entry_t	  *vmalist;	/**< List of vmas (for debugging) */
	drm_lock_data_t	  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 */
	drm_queue_t	  **queuelist;	/**< Vector of pointers to DMA queues */
	drm_device_dma_t  *dma;		/**< Optional pointer for DMA support */
	/*@}*/

	/** \name Context support */
	/*@{*/
	int		  irq;		/**< Interrupt used by board */
	__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 */
	/*@}*/
	
#if !HAS_WORKQUEUE
	struct tq_struct  tq;
#else
	struct work_struct	work;
#endif
	/** \name VBLANK IRQ support */
	/*@{*/
#if __HAVE_VBL_IRQ
   	wait_queue_head_t vbl_queue;	/**< VBLANK wait queue */
   	atomic_t          vbl_received;
	spinlock_t        vbl_lock;
	drm_vbl_sig_t     vbl_sigs;	/**< signal list to send on VBLANK */
	unsigned int      vbl_pending;
#endif
	/*@}*/
	cycles_t	  ctx_start;
	cycles_t	  lck_start;

	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 */

#if __REALLY_HAVE_AGP
	drm_agp_head_t    *agp;	/**< AGP data */
#endif
	struct pci_dev *pdev;		/**< PCI device structure */
#ifdef __alpha__
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,3)
	struct pci_controler *hose;
#else
	struct pci_controller *hose;
#endif
#endif
	drm_sg_mem_t      *sg;  /**< Scatter gather memory */
	unsigned long     *ctx_bitmap;	/**< context bitmap */
	void		  *dev_private; /**< device private data */
	drm_sigdata_t     sigdata; /**< For block_all_signals */
	sigset_t          sigmask;
} drm_device_t;


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

				/* Misc. support (drm_init.h) */
extern int	     DRM(flags);
extern void	     DRM(parse_options)( char *s );
extern int           DRM(cpu_valid)( void );

				/* Driver support (drm_drv.h) */
extern int           DRM(version)(struct inode *inode, struct file *filp,
				  unsigned int cmd, unsigned long arg);
extern int           DRM(open)(struct inode *inode, struct file *filp);
extern int           DRM(release)(struct inode *inode, struct file *filp);
extern int           DRM(ioctl)(struct inode *inode, struct file *filp,
				unsigned int cmd, unsigned long arg);
extern int           DRM(lock)(struct inode *inode, struct file *filp,
			       unsigned int cmd, unsigned long arg);
extern int           DRM(unlock)(struct inode *inode, struct file *filp,
				 unsigned int cmd, unsigned long arg);

				/* Device support (drm_fops.h) */
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(fasync)(int fd, struct file *filp, int on);

				/* Mapping support (drm_vm.h) */
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);
extern struct page *DRM(vm_sg_nopage)(struct vm_area_struct *vma,
				      unsigned long address,
				      int write_access);
extern void	     DRM(vm_open)(struct vm_area_struct *vma);
extern void	     DRM(vm_close)(struct vm_area_struct *vma);
extern void	     DRM(vm_shm_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);
extern unsigned int  DRM(poll)(struct file *filp, struct poll_table_struct *wait);
extern ssize_t       DRM(read)(struct file *filp, char *buf, size_t count, loff_t *off);

				/* Memory management support (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(alloc)(size_t size, int area);
extern void	     *DRM(realloc)(void *oldpt, size_t oldsize, size_t size,
				   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, drm_device_t *dev);
extern void	     *DRM(ioremap_nocache)(unsigned long offset, unsigned long size,
					   drm_device_t *dev);
extern void	     DRM(ioremapfree)(void *pt, unsigned long size, drm_device_t *dev);

#if __REALLY_HAVE_AGP
extern agp_memory    *DRM(alloc_agp)(int pages, u32 type);
extern int           DRM(free_agp)(agp_memory *handle, int pages);
extern int           DRM(bind_agp)(agp_memory *handle, unsigned int start);
extern int           DRM(unbind_agp)(agp_memory *handle);
#endif

				/* Misc. IOCTL support (drm_ioctl.h) */
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);
extern int	     DRM(getmap)(struct inode *inode, struct file *filp,
				 unsigned int cmd, unsigned long arg);
extern int	     DRM(getclient)(struct inode *inode, struct file *filp,
				    unsigned int cmd, unsigned long arg);
extern int	     DRM(getstats)(struct inode *inode, struct file *filp,
				   unsigned int cmd, unsigned long arg);

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

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);

#if __HAVE_CTX_BITMAP
extern int	     DRM(ctxbitmap_init)( drm_device_t *dev );
extern void	     DRM(ctxbitmap_cleanup)( drm_device_t *dev );
#endif

extern int	     DRM(setsareactx)( struct inode *inode, struct file *filp,
				       unsigned int cmd, unsigned long arg );
extern int	     DRM(getsareactx)( struct inode *inode, struct file *filp,
				       unsigned int cmd, unsigned long arg );

				/* Drawable IOCTL support (drm_drawable.h) */
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 (drm_auth.h) */
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);

                                /* Placeholder for ioctls past */
extern int	     DRM(noop)(struct inode *inode, struct file *filp,
				  unsigned int cmd, unsigned long arg);

				/* Locking IOCTL support (drm_lock.h) */
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(notifier)(void *priv);

				/* Buffer management support (drm_bufs.h) */
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(rmmap)( struct inode *inode, struct file *filp,
				 unsigned int cmd, unsigned long arg );
#if __HAVE_DMA
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 );

				/* DMA support (drm_dma.h) */
extern int	     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)( struct file *filp );
#if __HAVE_DMA_IRQ
extern int           DRM(control)( struct inode *inode, struct file *filp,
				   unsigned int cmd, unsigned long arg );
extern int           DRM(irq_install)( drm_device_t *dev, int irq );
extern int           DRM(irq_uninstall)( drm_device_t *dev );
extern void          DRM(dma_service)( int irq, void *device,
				       struct pt_regs *regs );
extern void          DRM(driver_irq_preinstall)( drm_device_t *dev );
extern void          DRM(driver_irq_postinstall)( drm_device_t *dev );
extern void          DRM(driver_irq_uninstall)( drm_device_t *dev );
#if __HAVE_VBL_IRQ
extern int           DRM(wait_vblank)(struct inode *inode, struct file *filp,
				      unsigned int cmd, unsigned long arg);
extern int           DRM(vblank_wait)(drm_device_t *dev, unsigned int *vbl_seq);
extern void          DRM(vbl_send_signals)( drm_device_t *dev );
#endif
#if __HAVE_DMA_IRQ_BH
extern void          DRM(dma_immediate_bh)( void *dev );
#endif
#endif

#endif /* __HAVE_DMA */

#if __REALLY_HAVE_AGP
				/* AGP/GART support (drm_agpsupport.h) */
extern drm_agp_head_t *DRM(agp_init)(void);
extern void           DRM(agp_uninit)(void);
extern int            DRM(agp_acquire)(struct inode *inode, struct file *filp,
				       unsigned int cmd, unsigned long arg);
extern void           DRM(agp_do_release)(void);
extern int            DRM(agp_release)(struct inode *inode, struct file *filp,
				       unsigned int cmd, unsigned long arg);
extern int            DRM(agp_enable)(struct inode *inode, struct file *filp,
				      unsigned int cmd, unsigned long arg);
extern int            DRM(agp_info)(struct inode *inode, struct file *filp,
				    unsigned int cmd, unsigned long arg);
extern int            DRM(agp_alloc)(struct inode *inode, struct file *filp,
				     unsigned int cmd, unsigned long arg);
extern int            DRM(agp_free)(struct inode *inode, struct file *filp,
				    unsigned int cmd, unsigned long arg);
extern int            DRM(agp_unbind)(struct inode *inode, struct file *filp,
				      unsigned int cmd, unsigned long arg);
extern int            DRM(agp_bind)(struct inode *inode, struct file *filp,
				    unsigned int cmd, unsigned long arg);
extern agp_memory     *DRM(agp_allocate_memory)(size_t pages, u32 type);
extern int            DRM(agp_free_memory)(agp_memory *handle);
extern int            DRM(agp_bind_memory)(agp_memory *handle, off_t start);
extern int            DRM(agp_unbind_memory)(agp_memory *handle);
#endif

				/* Stub support (drm_stub.h) */
int                   DRM(stub_register)(const char *name,
					 struct file_operations *fops,
					 drm_device_t *dev);
int                   DRM(stub_unregister)(int minor);

				/* Proc support (drm_proc.h) */
extern struct proc_dir_entry *DRM(proc_init)(drm_device_t *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);

#if __HAVE_SG
				/* Scatter Gather Support (drm_scatter.h) */
extern void           DRM(sg_cleanup)(drm_sg_mem_t *entry);
extern int            DRM(sg_alloc)(struct inode *inode, struct file *filp,
				    unsigned int cmd, unsigned long arg);
extern int            DRM(sg_free)(struct inode *inode, struct file *filp,
				   unsigned int cmd, unsigned long arg);
#endif

                               /* ATI PCIGART support (ati_pcigart.h) */
extern int            DRM(ati_pcigart_init)(drm_device_t *dev,
					    unsigned long *addr,
					    dma_addr_t *bus_addr);
extern int            DRM(ati_pcigart_cleanup)(drm_device_t *dev,
					       unsigned long addr,
					       dma_addr_t bus_addr);

/*@}*/

#endif /* __KERNEL__ */
#endif