summaryrefslogtreecommitdiff
path: root/src/radeon_dri2.c
blob: 70ad1d92a567ad739005cf4f2bb399995efeacd7 (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
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
/*
 * Copyright 2008 Kristian Høgsberg 
 * Copyright 2008 Jérôme Glisse
 *
 * 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 on 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
 * NON-INFRINGEMENT.  IN NO EVENT SHALL ATI, VA LINUX SYSTEMS AND/OR
 * THEIR 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.
 */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "radeon.h"
#include "radeon_dri2.h"
#include "radeon_video.h"

#ifdef DRI2

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>

#include "radeon_bo_helper.h"
#include "radeon_version.h"

#include "radeon_bo_gem.h"

#include <list.h>
#include <xf86Priv.h>
#include <X11/extensions/dpmsconst.h>

#define FALLBACK_SWAP_DELAY 16

#include "radeon_glamor.h"

typedef DRI2BufferPtr BufferPtr;

struct dri2_buffer_priv {
    PixmapPtr   pixmap;
    unsigned int attachment;
    unsigned int refcnt;
};


struct dri2_window_priv {
    xf86CrtcPtr crtc;
    int vblank_delta;
};

static DevPrivateKeyRec dri2_window_private_key_rec;
#define dri2_window_private_key (&dri2_window_private_key_rec)

#define get_dri2_window_priv(window) \
    ((struct dri2_window_priv*) \
     dixLookupPrivate(&(window)->devPrivates, dri2_window_private_key))


/* Get GEM flink name for a pixmap */
static Bool
radeon_get_flink_name(RADEONEntPtr pRADEONEnt, PixmapPtr pixmap, uint32_t *name)
{
    struct radeon_buffer *bo = radeon_get_pixmap_bo(pixmap);
    struct drm_gem_flink flink;

    if (bo && !(bo->flags & RADEON_BO_FLAGS_GBM) &&
	radeon_gem_get_kernel_name(bo->bo.radeon, name) == 0)
	return TRUE;

    if (radeon_get_pixmap_handle(pixmap, &flink.handle)) {
	if (drmIoctl(pRADEONEnt->fd, DRM_IOCTL_GEM_FLINK, &flink) != 0)
	    return FALSE;

	*name = flink.name;
	return TRUE;
    }

    return FALSE;
}

static BufferPtr
radeon_dri2_create_buffer2(ScreenPtr pScreen,
			   DrawablePtr drawable,
			   unsigned int attachment,
			   unsigned int format)
{
    ScrnInfoPtr pScrn = xf86ScreenToScrn(pScreen);
    RADEONEntPtr pRADEONEnt = RADEONEntPriv(pScrn);
    RADEONInfoPtr info = RADEONPTR(pScrn);
    BufferPtr buffers;
    struct dri2_buffer_priv *privates;
    PixmapPtr pixmap;
    int flags;
    unsigned front_width;
    uint32_t tiling = 0;
    unsigned aligned_width = drawable->width;
    unsigned height = drawable->height;
    Bool is_glamor_pixmap = FALSE;
    int depth;
    int cpp;

    if (format) {
	depth = format;

	switch (depth) {
	case 15:
	    cpp = 2;
	    break;
	case 24:
	case 30:
	    cpp = 4;
	    break;
	default:
	    cpp = depth / 8;
	}
    } else {
	depth = drawable->depth;
	cpp = drawable->bitsPerPixel / 8;
    }

    front_width = pScreen->GetScreenPixmap(pScreen)->drawable.width;

    pixmap = NULL;

    if (attachment == DRI2BufferFrontLeft) {
	uint32_t handle;

        pixmap = get_drawable_pixmap(drawable);
	if (pScreen != pixmap->drawable.pScreen)
	    pixmap = NULL;
	else if (info->use_glamor && !radeon_get_pixmap_handle(pixmap, &handle)) {
	    is_glamor_pixmap = TRUE;
	    aligned_width = pixmap->drawable.width;
	    height = pixmap->drawable.height;
	    pixmap = NULL;
	} else
	    pixmap->refcnt++;
    }

    if (!pixmap && (is_glamor_pixmap || attachment != DRI2BufferFrontLeft)) {
	/* tile the back buffer */
	switch(attachment) {
	case DRI2BufferDepth:
	    /* macro is the preferred setting, but the 2D detiling for software
	     * fallbacks in mesa still has issues on some configurations
	     */
	    if (info->ChipFamily >= CHIP_FAMILY_R600) {
		if (info->allowColorTiling2D) {
			flags = RADEON_CREATE_PIXMAP_TILING_MACRO;
		} else {
			flags = RADEON_CREATE_PIXMAP_TILING_MICRO;
		}
		if (info->ChipFamily >= CHIP_FAMILY_CEDAR)
		    flags |= RADEON_CREATE_PIXMAP_SZBUFFER;
	    } else if (cpp == 2 && info->ChipFamily >= CHIP_FAMILY_R300)
		flags = RADEON_CREATE_PIXMAP_TILING_MACRO | RADEON_CREATE_PIXMAP_TILING_MICRO_SQUARE;
	    else
		flags = RADEON_CREATE_PIXMAP_TILING_MACRO | RADEON_CREATE_PIXMAP_TILING_MICRO;
	    if (IS_R200_3D || info->ChipFamily == CHIP_FAMILY_RV200 || info->ChipFamily == CHIP_FAMILY_RADEON)
		flags |= RADEON_CREATE_PIXMAP_DEPTH;
	    break;
	case DRI2BufferDepthStencil:
	    /* macro is the preferred setting, but the 2D detiling for software
	     * fallbacks in mesa still has issues on some configurations
	     */
	    if (info->ChipFamily >= CHIP_FAMILY_R600) {
		if (info->allowColorTiling2D) {
			flags = RADEON_CREATE_PIXMAP_TILING_MACRO;
		} else {
			flags = RADEON_CREATE_PIXMAP_TILING_MICRO;
		}
		if (info->ChipFamily >= CHIP_FAMILY_CEDAR)
		    flags |= RADEON_CREATE_PIXMAP_SZBUFFER;
	    } else if (cpp == 2 && info->ChipFamily >= CHIP_FAMILY_R300)
		flags = RADEON_CREATE_PIXMAP_TILING_MACRO | RADEON_CREATE_PIXMAP_TILING_MICRO_SQUARE;
	    else
		flags = RADEON_CREATE_PIXMAP_TILING_MACRO | RADEON_CREATE_PIXMAP_TILING_MICRO;
	    if (IS_R200_3D || info->ChipFamily == CHIP_FAMILY_RV200 || info->ChipFamily == CHIP_FAMILY_RADEON)
		flags |= RADEON_CREATE_PIXMAP_DEPTH;
		
	    break;
	case DRI2BufferBackLeft:
	case DRI2BufferBackRight:
	case DRI2BufferFrontLeft:
	case DRI2BufferFrontRight:
	case DRI2BufferFakeFrontLeft:
	case DRI2BufferFakeFrontRight:
	    if (info->ChipFamily >= CHIP_FAMILY_R600) {
		if (info->allowColorTiling2D) {
			flags = RADEON_CREATE_PIXMAP_TILING_MACRO;
		} else {
			flags = RADEON_CREATE_PIXMAP_TILING_MICRO;
		}
	    } else
		flags = RADEON_CREATE_PIXMAP_TILING_MACRO;
	    break;
	default:
	    flags = 0;
	}

	if (flags & RADEON_CREATE_PIXMAP_TILING_MICRO)
	    tiling |= RADEON_TILING_MICRO;
	if (flags & RADEON_CREATE_PIXMAP_TILING_MICRO_SQUARE)
	    tiling |= RADEON_TILING_MICRO_SQUARE;
	if (flags & RADEON_CREATE_PIXMAP_TILING_MACRO)
	    tiling |= RADEON_TILING_MACRO;

	if (aligned_width == front_width)
	    aligned_width = pScrn->virtualX;

	pixmap = (*pScreen->CreatePixmap)(pScreen,
					  aligned_width,
					  height,
					  depth,
					  flags | RADEON_CREATE_PIXMAP_DRI2);
    }

    if (!pixmap)
	return NULL;

    buffers = calloc(1, sizeof *buffers);
    if (buffers == NULL)
        goto error;

    if (!info->use_glamor) {
	info->exa_force_create = TRUE;
	exaMoveInPixmap(pixmap);
	info->exa_force_create = FALSE;
	if (exaGetPixmapDriverPrivate(pixmap) == NULL) {
	    /* this happen if pixmap is non accelerable */
	    goto error;
	}
    } else if (is_glamor_pixmap) {
	pixmap = radeon_glamor_set_pixmap_bo(drawable, pixmap);
	pixmap->refcnt++;
    }

    if (!radeon_get_flink_name(pRADEONEnt, pixmap, &buffers->name))
	goto error;

    privates = calloc(1, sizeof(struct dri2_buffer_priv));
    if (privates == NULL)
        goto error;

    buffers->attachment = attachment;
    buffers->pitch = pixmap->devKind;
    buffers->cpp = cpp;
    buffers->driverPrivate = privates;
    buffers->format = format;
    buffers->flags = 0; /* not tiled */
    privates->pixmap = pixmap;
    privates->attachment = attachment;
    privates->refcnt = 1;

    return buffers;

error:
    free(buffers);
    (*pScreen->DestroyPixmap)(pixmap);
    return NULL;
}

static void
radeon_dri2_destroy_buffer2(ScreenPtr pScreen,
			    DrawablePtr drawable, BufferPtr buffers)
{
    if(buffers)
    {
        struct dri2_buffer_priv *private = buffers->driverPrivate;

        /* Trying to free an already freed buffer is unlikely to end well */
        if (private->refcnt == 0) {
            ScrnInfoPtr scrn = xf86ScreenToScrn(pScreen);

            xf86DrvMsg(scrn->scrnIndex, X_WARNING, 
                       "Attempted to destroy previously destroyed buffer.\
 This is a programming error\n");
            return;
        }

        private->refcnt--;
        if (private->refcnt == 0)
        {
	    if (private->pixmap)
                (*pScreen->DestroyPixmap)(private->pixmap);

            free(buffers->driverPrivate);
            free(buffers);
        }
    }
}


static inline PixmapPtr GetDrawablePixmap(DrawablePtr drawable)
{
    if (drawable->type == DRAWABLE_PIXMAP)
        return (PixmapPtr)drawable;
    else {
        struct _Window *pWin = (struct _Window *)drawable;
        return drawable->pScreen->GetWindowPixmap(pWin);
    }
}
static void
radeon_dri2_copy_region2(ScreenPtr pScreen,
			 DrawablePtr drawable,
			 RegionPtr region,
			 BufferPtr dest_buffer,
			 BufferPtr src_buffer)
{
    struct dri2_buffer_priv *src_private = src_buffer->driverPrivate;
    struct dri2_buffer_priv *dst_private = dest_buffer->driverPrivate;
    ScrnInfoPtr pScrn = xf86ScreenToScrn(pScreen);
    DrawablePtr src_drawable;
    DrawablePtr dst_drawable;
    RegionPtr copy_clip;
    GCPtr gc;
    RADEONInfoPtr info = RADEONPTR(pScrn);
    Bool vsync;
    Bool translate = FALSE;
    int off_x = 0, off_y = 0;

    src_drawable = &src_private->pixmap->drawable;
    dst_drawable = &dst_private->pixmap->drawable;

    if (src_private->attachment == DRI2BufferFrontLeft) {
	if (drawable->pScreen != pScreen) {
	    src_drawable = DRI2UpdatePrime(drawable, src_buffer);
	    if (!src_drawable)
		return;
	} else
	    src_drawable = drawable;
    }
    if (dst_private->attachment == DRI2BufferFrontLeft) {
	if (drawable->pScreen != pScreen) {
	    dst_drawable = DRI2UpdatePrime(drawable, dest_buffer);
	    if (!dst_drawable)
		return;
	    if (dst_drawable != drawable)
		translate = TRUE;
	} else
	    dst_drawable = drawable;
    }

    if (translate && drawable->type == DRAWABLE_WINDOW) {
	PixmapPtr pPix = GetDrawablePixmap(drawable);

	off_x = drawable->x - pPix->screen_x;
	off_y = drawable->y - pPix->screen_y;
    }
    gc = GetScratchGC(dst_drawable->depth, pScreen);
    copy_clip = REGION_CREATE(pScreen, NULL, 0);
    REGION_COPY(pScreen, copy_clip, region);

    if (translate) {
	REGION_TRANSLATE(pScreen, copy_clip, off_x, off_y);
    }

    (*gc->funcs->ChangeClip) (gc, CT_REGION, copy_clip, 0);
    ValidateGC(dst_drawable, gc);

    vsync = info->accel_state->vsync;
    /* Driver option "SwapbuffersWait" defines if we vsync DRI2 copy-swaps. */ 
    info->accel_state->vsync = info->swapBuffersWait;
    info->accel_state->force = TRUE;

    (*gc->ops->CopyArea)(src_drawable, dst_drawable, gc,
                         0, 0, drawable->width, drawable->height, off_x, off_y);

    info->accel_state->force = FALSE;
    info->accel_state->vsync = vsync;

    FreeScratchGC(gc);
}

enum DRI2FrameEventType {
    DRI2_SWAP,
    DRI2_FLIP,
    DRI2_WAITMSC,
};

typedef struct _DRI2FrameEvent {
    XID drawable_id;
    ClientPtr client;
    enum DRI2FrameEventType type;
    unsigned frame;
    xf86CrtcPtr crtc;
    OsTimerPtr timer;
    uintptr_t drm_queue_seq;

    /* for swaps & flips only */
    DRI2SwapEventPtr event_complete;
    void *event_data;
    DRI2BufferPtr front;
    DRI2BufferPtr back;
} DRI2FrameEventRec, *DRI2FrameEventPtr;

static int DRI2InfoCnt;

static void
radeon_dri2_ref_buffer(BufferPtr buffer)
{
    struct dri2_buffer_priv *private = buffer->driverPrivate;
    private->refcnt++;
}

static void
radeon_dri2_unref_buffer(BufferPtr buffer)
{
    if (buffer) {
        struct dri2_buffer_priv *private = buffer->driverPrivate;
        DrawablePtr draw = &private->pixmap->drawable;

        radeon_dri2_destroy_buffer2(draw->pScreen, draw, buffer);
    }
}

static void
radeon_dri2_client_state_changed(CallbackListPtr *ClientStateCallback, pointer data, pointer calldata)
{
    NewClientInfoRec *clientinfo = calldata;
    ClientPtr pClient = clientinfo->client;

    switch (pClient->clientState) {
    case ClientStateRetained:
    case ClientStateGone:
        radeon_drm_abort_client(pClient);
        break;
    default:
        break;
    }
}

/*
 * Get current frame count delta for the specified drawable and CRTC
 */
static uint32_t radeon_get_msc_delta(DrawablePtr pDraw, xf86CrtcPtr crtc)
{
    drmmode_crtc_private_ptr drmmode_crtc = crtc->driver_private;

    if (pDraw && pDraw->type == DRAWABLE_WINDOW)
	return drmmode_crtc->interpolated_vblanks +
	    get_dri2_window_priv((WindowPtr)pDraw)->vblank_delta;

    return drmmode_crtc->interpolated_vblanks;
}

/*
 * Get current frame count and timestamp of the specified CRTC
 */
static Bool radeon_dri2_get_crtc_msc(xf86CrtcPtr crtc, CARD64 *ust, CARD64 *msc)
{
    drmmode_crtc_private_ptr drmmode_crtc = crtc->driver_private;

    if (!radeon_crtc_is_enabled(crtc) ||
	 drmmode_crtc_get_ust_msc(crtc, ust, msc) != Success) {
	/* CRTC is not running, extrapolate MSC and timestamp */
	ScrnInfoPtr scrn = crtc->scrn;
	RADEONEntPtr pRADEONEnt = RADEONEntPriv(scrn);
	CARD64 now, delta_t, delta_seq;

	if (!drmmode_crtc->dpms_last_ust)
	    return FALSE;

	if (drmmode_get_current_ust(pRADEONEnt->fd, &now) != 0) {
	    xf86DrvMsg(scrn->scrnIndex, X_ERROR,
		       "%s cannot get current time\n", __func__);
	    return FALSE;
	}

	delta_t = now - drmmode_crtc->dpms_last_ust;
	delta_seq = delta_t * drmmode_crtc->dpms_last_fps;
	delta_seq /= 1000000;
	*ust = drmmode_crtc->dpms_last_ust;
	delta_t = delta_seq * 1000000;
	delta_t /= drmmode_crtc->dpms_last_fps;
	*ust += delta_t;
	*msc = drmmode_crtc->dpms_last_seq;
	*msc += delta_seq;
    }

    *msc += drmmode_crtc->interpolated_vblanks;

    return TRUE;
}

static
xf86CrtcPtr radeon_dri2_drawable_crtc(DrawablePtr pDraw, Bool consider_disabled)
{
    ScreenPtr pScreen = pDraw->pScreen;
    ScrnInfoPtr pScrn = xf86ScreenToScrn(pScreen);
    xf86CrtcPtr crtc = radeon_pick_best_crtc(pScrn, consider_disabled,
					      pDraw->x, pDraw->x + pDraw->width,
					      pDraw->y, pDraw->y + pDraw->height);

    if (crtc && pDraw->type == DRAWABLE_WINDOW) {
	struct dri2_window_priv *priv = get_dri2_window_priv((WindowPtr)pDraw);

	if (priv->crtc && priv->crtc != crtc) {
	    CARD64 ust, mscold, mscnew;

	    if (radeon_dri2_get_crtc_msc(priv->crtc, &ust, &mscold) &&
		radeon_dri2_get_crtc_msc(crtc, &ust, &mscnew))
		priv->vblank_delta += mscold - mscnew;
	}

	priv->crtc = crtc;
    }

    return crtc;
}

static void
radeon_dri2_flip_event_abort(xf86CrtcPtr crtc, void *event_data)
{
    if (crtc)
	RADEONPTR(crtc->scrn)->drmmode.dri2_flipping = FALSE;

    free(event_data);
}

static void
radeon_dri2_flip_event_handler(xf86CrtcPtr crtc, uint32_t frame, uint64_t usec,
			       void *event_data)
{
    DRI2FrameEventPtr flip = event_data;
    ScrnInfoPtr scrn = crtc->scrn;
    unsigned tv_sec, tv_usec;
    DrawablePtr drawable;
    ScreenPtr screen;
    int status;
    PixmapPtr pixmap;

    status = dixLookupDrawable(&drawable, flip->drawable_id, serverClient,
			       M_ANY, DixWriteAccess);
    if (status != Success)
	goto abort;

    frame += radeon_get_msc_delta(drawable, crtc);

    screen = scrn->pScreen;
    pixmap = screen->GetScreenPixmap(screen);
    xf86DrvMsgVerb(scrn->scrnIndex, X_INFO, RADEON_LOGLEVEL_DEBUG,
		   "%s:%d fevent[%p] width %d pitch %d (/4 %d)\n",
		   __func__, __LINE__, flip, pixmap->drawable.width, pixmap->devKind, pixmap->devKind/4);

    tv_sec = usec / 1000000;
    tv_usec = usec % 1000000;

    /* We assume our flips arrive in order, so we don't check the frame */
    switch (flip->type) {
    case DRI2_SWAP:
	/* Check for too small vblank count of pageflip completion, taking wraparound
	 * into account. This usually means some defective kms pageflip completion,
	 * causing wrong (msc, ust) return values and possible visual corruption.
	 */
	if ((frame < flip->frame) && (flip->frame - frame < 5)) {
	    xf86DrvMsg(scrn->scrnIndex, X_WARNING,
		       "%s: Pageflip completion event has impossible msc %u < target_msc %u\n",
		       __func__, frame, flip->frame);
	    /* All-Zero values signal failure of (msc, ust) timestamping to client. */
	    frame = tv_sec = tv_usec = 0;
	}

	DRI2SwapComplete(flip->client, drawable, frame, tv_sec, tv_usec,
			 DRI2_FLIP_COMPLETE, flip->event_complete,
			 flip->event_data);
	break;
    default:
	xf86DrvMsg(scrn->scrnIndex, X_WARNING, "%s: unknown vblank event received\n", __func__);
	/* Unknown type */
	break;
    }

abort:
    radeon_dri2_flip_event_abort(crtc, event_data);
}

static Bool
radeon_dri2_schedule_flip(xf86CrtcPtr crtc, ClientPtr client,
			  DrawablePtr draw, DRI2BufferPtr front,
			  DRI2BufferPtr back, DRI2SwapEventPtr func,
			  void *data, unsigned int target_msc)
{
    ScrnInfoPtr scrn = crtc->scrn;
    RADEONInfoPtr info = RADEONPTR(scrn);
    struct dri2_buffer_priv *back_priv;
    DRI2FrameEventPtr flip_info;

    flip_info = calloc(1, sizeof(DRI2FrameEventRec));
    if (!flip_info)
	return FALSE;

    flip_info->drawable_id = draw->id;
    flip_info->client = client;
    flip_info->type = DRI2_SWAP;
    flip_info->event_complete = func;
    flip_info->event_data = data;
    flip_info->frame = target_msc;
    flip_info->crtc = crtc;

    xf86DrvMsgVerb(scrn->scrnIndex, X_INFO, RADEON_LOGLEVEL_DEBUG,
		   "%s:%d fevent[%p]\n", __func__, __LINE__, flip_info);

    /* Page flip the full screen buffer */
    back_priv = back->driverPrivate;
    if (radeon_do_pageflip(scrn, client, back_priv->pixmap,
			   RADEON_DRM_QUEUE_ID_DEFAULT, flip_info, crtc,
			   radeon_dri2_flip_event_handler,
			   radeon_dri2_flip_event_abort, FLIP_VSYNC,
			   target_msc - radeon_get_msc_delta(draw, crtc))) {
	info->drmmode.dri2_flipping = TRUE;
	return TRUE;
    }

    return FALSE;
}

static Bool
update_front(DrawablePtr draw, DRI2BufferPtr front)
{
    PixmapPtr pixmap;
    ScrnInfoPtr scrn = xf86ScreenToScrn(draw->pScreen);
    RADEONEntPtr pRADEONEnt = RADEONEntPriv(scrn);
    RADEONInfoPtr info = RADEONPTR(scrn);
    struct dri2_buffer_priv *priv = front->driverPrivate;

    pixmap = get_drawable_pixmap(draw);
    pixmap->refcnt++;

    if (!info->use_glamor)
	exaMoveInPixmap(pixmap);
    if (!radeon_get_flink_name(pRADEONEnt, pixmap, &front->name)) {
	(*draw->pScreen->DestroyPixmap)(pixmap);
	return FALSE;
    }
    (*draw->pScreen->DestroyPixmap)(priv->pixmap);
    front->pitch = pixmap->devKind;
    front->cpp = pixmap->drawable.bitsPerPixel / 8;
    priv->pixmap = pixmap;

    return TRUE;
}

static Bool
can_exchange(ScrnInfoPtr pScrn, DrawablePtr draw,
	     DRI2BufferPtr front, DRI2BufferPtr back)
{
    struct dri2_buffer_priv *front_priv = front->driverPrivate;
    struct dri2_buffer_priv *back_priv = back->driverPrivate;
    PixmapPtr front_pixmap;
    PixmapPtr back_pixmap = back_priv->pixmap;

    if (!update_front(draw, front))
	return FALSE;

    front_pixmap = front_priv->pixmap;

    if (front_pixmap->drawable.width != back_pixmap->drawable.width)
	return FALSE;

    if (front_pixmap->drawable.height != back_pixmap->drawable.height)
	return FALSE;

    if (front_pixmap->drawable.bitsPerPixel != back_pixmap->drawable.bitsPerPixel)
	return FALSE;

    if (front_pixmap->devKind != back_pixmap->devKind)
	return FALSE;

    return TRUE;
}

static Bool
can_flip(xf86CrtcPtr crtc, DrawablePtr draw,
	 DRI2BufferPtr front, DRI2BufferPtr back)
{
    ScrnInfoPtr pScrn = crtc->scrn;
    RADEONInfoPtr info = RADEONPTR(pScrn);
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(pScrn);
    int num_crtcs_on;
    int i;

    if (draw->type != DRAWABLE_WINDOW ||
	!info->allowPageFlip ||
	info->sprites_visible > 0 ||
	info->drmmode.present_flipping ||
	!pScrn->vtSema ||
	!DRI2CanFlip(draw))
	return FALSE;

    for (i = 0, num_crtcs_on = 0; i < config->num_crtc; i++) {
	if (drmmode_crtc_can_flip(config->crtc[i]))
	    num_crtcs_on++;
    }

    return num_crtcs_on > 0 && can_exchange(pScrn, draw, front, back);
}

static void
radeon_dri2_exchange_buffers(DrawablePtr draw, DRI2BufferPtr front, DRI2BufferPtr back)
{
    struct dri2_buffer_priv *front_priv = front->driverPrivate;
    struct dri2_buffer_priv *back_priv = back->driverPrivate;
    ScreenPtr screen = draw->pScreen;
    RADEONInfoPtr info = RADEONPTR(xf86ScreenToScrn(screen));
    RegionRec region;
    int tmp;

    region.extents.x1 = region.extents.y1 = 0;
    region.extents.x2 = front_priv->pixmap->drawable.width;
    region.extents.y2 = front_priv->pixmap->drawable.height;
    region.data = NULL;
    DamageRegionAppend(&front_priv->pixmap->drawable, &region);

    /* Swap BO names so DRI works */
    tmp = front->name;
    front->name = back->name;
    back->name = tmp;

    /* Swap pixmap privates */
#ifdef USE_GLAMOR
    if (info->use_glamor) {
	struct radeon_pixmap *front_pix, *back_pix;

	front_pix = radeon_get_pixmap_private(front_priv->pixmap);
	back_pix = radeon_get_pixmap_private(back_priv->pixmap);
	radeon_set_pixmap_private(front_priv->pixmap, back_pix);
	radeon_set_pixmap_private(back_priv->pixmap, front_pix);

	radeon_glamor_exchange_buffers(front_priv->pixmap, back_priv->pixmap);
    } else
#endif
    {
	struct radeon_exa_pixmap_priv driver_priv = *(struct radeon_exa_pixmap_priv*)
	    exaGetPixmapDriverPrivate(front_priv->pixmap);

	*(struct radeon_exa_pixmap_priv*)exaGetPixmapDriverPrivate(front_priv->pixmap) =
	    *(struct radeon_exa_pixmap_priv*)exaGetPixmapDriverPrivate(back_priv->pixmap);
	*(struct radeon_exa_pixmap_priv*)exaGetPixmapDriverPrivate(back_priv->pixmap) =
	    driver_priv;
    }

    DamageRegionProcessPending(&front_priv->pixmap->drawable);
}

static void radeon_dri2_frame_event_abort(xf86CrtcPtr crtc, void *event_data)
{
    DRI2FrameEventPtr event = event_data;

    TimerCancel(event->timer);
    TimerFree(event->timer);
    radeon_dri2_unref_buffer(event->front);
    radeon_dri2_unref_buffer(event->back);
    free(event);
}

static void radeon_dri2_frame_event_handler(xf86CrtcPtr crtc, uint32_t seq,
					    uint64_t usec, void *event_data)
{
    DRI2FrameEventPtr event = event_data;
    ScrnInfoPtr scrn = crtc->scrn;
    DrawablePtr drawable;
    int status;
    int swap_type;
    BoxRec box;
    RegionRec region;

    status = dixLookupDrawable(&drawable, event->drawable_id, serverClient,
                               M_ANY, DixWriteAccess);
    if (status != Success)
        goto cleanup;

    seq += radeon_get_msc_delta(drawable, crtc);

    switch (event->type) {
    case DRI2_FLIP:
	if (can_flip(crtc, drawable, event->front, event->back) &&
	    radeon_dri2_schedule_flip(crtc,
				      event->client,
				      drawable,
				      event->front,
				      event->back,
				      event->event_complete,
				      event->event_data,
				      event->frame)) {
	    radeon_dri2_exchange_buffers(drawable, event->front, event->back);
	    break;
	}
	/* else fall through to exchange/blit */
    case DRI2_SWAP:
	if (DRI2CanExchange(drawable) &&
	    can_exchange(scrn, drawable, event->front, event->back)) {
	    radeon_dri2_exchange_buffers(drawable, event->front, event->back);
	    swap_type = DRI2_EXCHANGE_COMPLETE;
	} else {
	    box.x1 = 0;
	    box.y1 = 0;
	    box.x2 = drawable->width;
	    box.y2 = drawable->height;
	    REGION_INIT(pScreen, &region, &box, 0);
	    radeon_dri2_copy_region2(drawable->pScreen, drawable, &region,
				     event->front, event->back);
	    swap_type = DRI2_BLIT_COMPLETE;
	}

        DRI2SwapComplete(event->client, drawable, seq, usec / 1000000,
			 usec % 1000000, swap_type, event->event_complete,
			 event->event_data);

        break;
    case DRI2_WAITMSC:
        DRI2WaitMSCComplete(event->client, drawable, seq, usec / 1000000,
			    usec % 1000000);
        break;
    default:
        /* Unknown type */
        xf86DrvMsg(scrn->scrnIndex, X_WARNING,
                "%s: unknown vblank event received\n", __func__);
        break;
    }

cleanup:
    radeon_dri2_frame_event_abort(crtc, event_data);
}

/*
 * This function should be called on a disabled CRTC only (i.e., CRTC
 * in DPMS-off state). It will calculate the delay necessary to reach
 * target_msc from present time if the CRTC were running.
 */
static
CARD32 radeon_dri2_extrapolate_msc_delay(xf86CrtcPtr crtc, CARD64 *target_msc,
					 CARD64 divisor, CARD64 remainder)
{
    drmmode_crtc_private_ptr drmmode_crtc = crtc->driver_private;
    ScrnInfoPtr pScrn = crtc->scrn;
    RADEONEntPtr pRADEONEnt = RADEONEntPriv(pScrn);
    int nominal_frame_rate = drmmode_crtc->dpms_last_fps;
    CARD64 last_vblank_ust = drmmode_crtc->dpms_last_ust;
    uint32_t last_vblank_seq = drmmode_crtc->dpms_last_seq;
    CARD64 now, target_time, delta_t;
    int64_t d, delta_seq;
    int ret;
    CARD32 d_ms;

    if (!last_vblank_ust) {
	*target_msc = 0;
	return FALLBACK_SWAP_DELAY;
    }
    ret = drmmode_get_current_ust(pRADEONEnt->fd, &now);
    if (ret) {
	xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
		   "%s cannot get current time\n", __func__);
	*target_msc = 0;
	return FALLBACK_SWAP_DELAY;
    }
    delta_seq = *target_msc - last_vblank_seq;
    delta_seq *= 1000000;
    target_time = last_vblank_ust;
    target_time += delta_seq / nominal_frame_rate;
    d = target_time - now;
    if (d < 0) {
	/* we missed the event, adjust target_msc, do the divisor magic */
	CARD64 current_msc = last_vblank_seq;

	delta_t = now - last_vblank_ust;
	delta_seq = delta_t * nominal_frame_rate;
	current_msc += delta_seq / 1000000;
	current_msc &= 0xffffffff;
	if (divisor == 0) {
	    *target_msc = current_msc;
	    d = 0;
	} else {
	    *target_msc = current_msc - (current_msc % divisor) + remainder;
	    if ((current_msc % divisor) >= remainder)
		*target_msc += divisor;
	    *target_msc &= 0xffffffff;
	    delta_seq = *target_msc - last_vblank_seq;
	    delta_seq *= 1000000;
	    target_time = last_vblank_ust;
	    target_time += delta_seq / nominal_frame_rate;
	    d = target_time - now;
	}
    }
    /*
     * convert delay to milliseconds and add margin to prevent the client
     * from coming back early (due to timer granularity and rounding
     * errors) and getting the same MSC it just got
     */
    d_ms = (CARD32)d / 1000;
    if ((CARD32)d - d_ms * 1000 > 0)
	d_ms += 2;
    else
	d_ms++;
    return d_ms;
}

/*
 * Get current interpolated frame count and frame count timestamp, based on
 * drawable's crtc.
 */
static int radeon_dri2_get_msc(DrawablePtr draw, CARD64 *ust, CARD64 *msc)
{
    xf86CrtcPtr crtc = radeon_dri2_drawable_crtc(draw, TRUE);

    /* Drawable not displayed, make up a value */
    if (crtc == NULL) {
        *ust = 0;
        *msc = 0;
        return TRUE;
    }

    if (!radeon_dri2_get_crtc_msc(crtc, ust, msc))
	return FALSE;

    if (draw && draw->type == DRAWABLE_WINDOW)
	*msc += get_dri2_window_priv((WindowPtr)draw)->vblank_delta;
    *msc &= 0xffffffff;
    return TRUE;
}

static
CARD32 radeon_dri2_deferred_event(OsTimerPtr timer, CARD32 now, pointer data)
{
    DRI2FrameEventPtr event_info = (DRI2FrameEventPtr)data;
    xf86CrtcPtr crtc = event_info->crtc;
    ScrnInfoPtr scrn;
    RADEONEntPtr pRADEONEnt;
    CARD64 drm_now;
    int ret;
    CARD64 delta_t, delta_seq, frame;
    drmmode_crtc_private_ptr drmmode_crtc;

    /*
     * This is emulated event, so its time is current time, which we
     * have to get in DRM-compatible form (which is a bit messy given
     * the information that we have at this point). Can't use now argument
     * because DRM event time may come from monotonic clock, while
     * DIX timer facility uses real-time clock.
     */
    if (!event_info->crtc) {
	ErrorF("%s no crtc\n", __func__);
	if (event_info->drm_queue_seq)
	    radeon_drm_abort_entry(event_info->drm_queue_seq);
	else
	    radeon_dri2_frame_event_abort(NULL, data);
	return 0;
    }

    scrn = crtc->scrn;
    pRADEONEnt = RADEONEntPriv(scrn);
    ret = drmmode_get_current_ust(pRADEONEnt->fd, &drm_now);
    if (ret) {
	xf86DrvMsg(scrn->scrnIndex, X_ERROR,
		   "%s cannot get current time\n", __func__);
	if (event_info->drm_queue_seq)
	    radeon_drm_queue_handler(pRADEONEnt->fd, 0, 0, 0,
				     (void*)event_info->drm_queue_seq);
	else
	    radeon_dri2_frame_event_handler(crtc, 0, 0, data);
	return 0;
    }
    /*
     * calculate the frame number from current time
     * that would come from CRTC if it were running
     */
    drmmode_crtc = event_info->crtc->driver_private;
    delta_t = drm_now - (CARD64)drmmode_crtc->dpms_last_ust;
    delta_seq = delta_t * drmmode_crtc->dpms_last_fps;
    delta_seq /= 1000000;
    frame = (CARD64)drmmode_crtc->dpms_last_seq + delta_seq;
    if (event_info->drm_queue_seq)
	radeon_drm_queue_handler(pRADEONEnt->fd, frame, drm_now / 1000000,
				 drm_now % 1000000,
				 (void*)event_info->drm_queue_seq);
    else
	radeon_dri2_frame_event_handler(crtc, frame, drm_now, data);
    return 0;
}

static
void radeon_dri2_schedule_event(CARD32 delay, DRI2FrameEventPtr event_info)
{
    event_info->timer = TimerSet(NULL, 0, delay, radeon_dri2_deferred_event,
				 event_info);
    if (delay == 0) {
	CARD32 now = GetTimeInMillis();
	radeon_dri2_deferred_event(event_info->timer, now, event_info);
    }
}

/*
 * Request a DRM event when the requested conditions will be satisfied.
 *
 * We need to handle the event and ask the server to wake up the client when
 * we receive it.
 */
static int radeon_dri2_schedule_wait_msc(ClientPtr client, DrawablePtr draw,
                                         CARD64 target_msc, CARD64 divisor,
                                         CARD64 remainder)
{
    ScreenPtr screen = draw->pScreen;
    ScrnInfoPtr scrn = xf86ScreenToScrn(screen);
    DRI2FrameEventPtr wait_info = NULL;
    uintptr_t drm_queue_seq = 0;
    xf86CrtcPtr crtc = radeon_dri2_drawable_crtc(draw, TRUE);
    uint32_t msc_delta;
    uint32_t seq;
    CARD64 current_msc;

    /* Truncate to match kernel interfaces; means occasional overflow
     * misses, but that's generally not a big deal */
    target_msc &= 0xffffffff;
    divisor &= 0xffffffff;
    remainder &= 0xffffffff;

    /* Drawable not visible, return immediately */
    if (crtc == NULL)
        goto out_complete;

    msc_delta = radeon_get_msc_delta(draw, crtc);

    wait_info = calloc(1, sizeof(DRI2FrameEventRec));
    if (!wait_info)
        goto out_complete;

    wait_info->drawable_id = draw->id;
    wait_info->client = client;
    wait_info->type = DRI2_WAITMSC;
    wait_info->crtc = crtc;

    /*
     * CRTC is in DPMS off state, calculate wait time from current time,
     * target_msc and last vblank time/sequence when CRTC was turned off
     */
    if (!radeon_crtc_is_enabled(crtc)) {
	CARD32 delay;
	target_msc -= msc_delta;
	delay = radeon_dri2_extrapolate_msc_delay(crtc, &target_msc,
						  divisor, remainder);
	radeon_dri2_schedule_event(delay, wait_info);
	DRI2BlockClient(client, draw);
	return TRUE;
    }

    /* Get current count */
    if (!drmmode_wait_vblank(crtc, DRM_VBLANK_RELATIVE, 0, 0, NULL, &seq)) {
        xf86DrvMsg(scrn->scrnIndex, X_WARNING,
                "get vblank counter failed: %s\n", strerror(errno));
        goto out_complete;
    }

    current_msc = seq + msc_delta;
    current_msc &= 0xffffffff;

    drm_queue_seq = radeon_drm_queue_alloc(crtc, client, RADEON_DRM_QUEUE_ID_DEFAULT,
					   wait_info, radeon_dri2_frame_event_handler,
					   radeon_dri2_frame_event_abort);
    if (drm_queue_seq == RADEON_DRM_QUEUE_ERROR) {
        xf86DrvMsg(scrn->scrnIndex, X_WARNING,
		   "Allocating DRM queue event entry failed.\n");
        goto out_complete;
    }
    wait_info->drm_queue_seq = drm_queue_seq;

    /*
     * If divisor is zero, or current_msc is smaller than target_msc,
     * we just need to make sure target_msc passes  before waking up the
     * client.
     */
    if (divisor == 0 || current_msc < target_msc) {
        /* If target_msc already reached or passed, set it to
         * current_msc to ensure we return a reasonable value back
         * to the caller. This keeps the client from continually
         * sending us MSC targets from the past by forcibly updating
         * their count on this call.
         */
        if (current_msc >= target_msc)
            target_msc = current_msc;
        if (!drmmode_wait_vblank(crtc, DRM_VBLANK_ABSOLUTE | DRM_VBLANK_EVENT,
				 target_msc - msc_delta, drm_queue_seq, NULL,
				 NULL)) {
            xf86DrvMsg(scrn->scrnIndex, X_WARNING,
                    "get vblank counter failed: %s\n", strerror(errno));
            goto out_complete;
        }

        DRI2BlockClient(client, draw);
        return TRUE;
    }

    /*
     * If we get here, target_msc has already passed or we don't have one,
     * so we queue an event that will satisfy the divisor/remainder equation.
     */
    target_msc = current_msc - (current_msc % divisor) + remainder - msc_delta;

    /*
     * If calculated remainder is larger than requested remainder,
     * it means we've passed the last point where
     * seq % divisor == remainder, so we need to wait for the next time
     * that will happen.
     */
    if ((current_msc % divisor) >= remainder)
        target_msc += divisor;

    if (!drmmode_wait_vblank(crtc, DRM_VBLANK_ABSOLUTE | DRM_VBLANK_EVENT,
			     target_msc, drm_queue_seq, NULL, NULL)) {
        xf86DrvMsg(scrn->scrnIndex, X_WARNING,
                "get vblank counter failed: %s\n", strerror(errno));
        goto out_complete;
    }

    DRI2BlockClient(client, draw);

    return TRUE;

out_complete:
    if (wait_info)
	radeon_dri2_deferred_event(NULL, 0, wait_info);
    return TRUE;
}

/*
 * ScheduleSwap is responsible for requesting a DRM vblank event for the
 * appropriate frame.
 *
 * In the case of a blit (e.g. for a windowed swap) or buffer exchange,
 * the vblank requested can simply be the last queued swap frame + the swap
 * interval for the drawable.
 *
 * In the case of a page flip, we request an event for the last queued swap
 * frame + swap interval - 1, since we'll need to queue the flip for the frame
 * immediately following the received event.
 *
 * The client will be blocked if it tries to perform further GL commands
 * after queueing a swap, though in the Intel case after queueing a flip, the
 * client is free to queue more commands; they'll block in the kernel if
 * they access buffers busy with the flip.
 *
 * When the swap is complete, the driver should call into the server so it
 * can send any swap complete events that have been requested.
 */
static int radeon_dri2_schedule_swap(ClientPtr client, DrawablePtr draw,
                                     DRI2BufferPtr front, DRI2BufferPtr back,
                                     CARD64 *target_msc, CARD64 divisor,
                                     CARD64 remainder, DRI2SwapEventPtr func,
                                     void *data)
{
    ScreenPtr screen = draw->pScreen;
    ScrnInfoPtr scrn = xf86ScreenToScrn(screen);
    xf86CrtcPtr crtc = radeon_dri2_drawable_crtc(draw, TRUE);
    uint32_t msc_delta;
    drmVBlankSeqType type;
    uint32_t seq;
    int flip = 0;
    DRI2FrameEventPtr swap_info = NULL;
    uintptr_t drm_queue_seq;
    CARD64 current_msc, event_msc;
    BoxRec box;
    RegionRec region;

    /* Truncate to match kernel interfaces; means occasional overflow
     * misses, but that's generally not a big deal */
    *target_msc &= 0xffffffff;
    divisor &= 0xffffffff;
    remainder &= 0xffffffff;

    /* radeon_dri2_frame_event_handler will get called some unknown time in the
     * future with these buffers.  Take a reference to ensure that they won't
     * get destroyed before then. 
     */
    radeon_dri2_ref_buffer(front);
    radeon_dri2_ref_buffer(back);

    /* either off-screen or CRTC not usable... just complete the swap */
    if (crtc == NULL)
        goto blit_fallback;

    msc_delta = radeon_get_msc_delta(draw, crtc);

    swap_info = calloc(1, sizeof(DRI2FrameEventRec));
    if (!swap_info)
        goto blit_fallback;

    swap_info->type = DRI2_SWAP;
    swap_info->drawable_id = draw->id;
    swap_info->client = client;
    swap_info->event_complete = func;
    swap_info->event_data = data;
    swap_info->front = front;
    swap_info->back = back;
    swap_info->crtc = crtc;

    drm_queue_seq = radeon_drm_queue_alloc(crtc, client, RADEON_DRM_QUEUE_ID_DEFAULT,
					   swap_info, radeon_dri2_frame_event_handler,
					   radeon_dri2_frame_event_abort);
    if (drm_queue_seq == RADEON_DRM_QUEUE_ERROR) {
        xf86DrvMsg(scrn->scrnIndex, X_WARNING,
		   "Allocating DRM queue entry failed.\n");
        goto blit_fallback;
    }
    swap_info->drm_queue_seq = drm_queue_seq;

    /*
     * CRTC is in DPMS off state, fallback to blit, but calculate
     * wait time from current time, target_msc and last vblank
     * time/sequence when CRTC was turned off
     */
    if (!radeon_crtc_is_enabled(crtc)) {
	CARD32 delay;
	*target_msc -= msc_delta;
	delay = radeon_dri2_extrapolate_msc_delay(crtc, target_msc,
						  divisor, remainder);
	*target_msc += msc_delta;
	*target_msc &= 0xffffffff;
	radeon_dri2_schedule_event(delay, swap_info);
	return TRUE;
    }

    /* Get current count */
    if (!drmmode_wait_vblank(crtc, DRM_VBLANK_RELATIVE, 0, 0, NULL, &seq)) {
        xf86DrvMsg(scrn->scrnIndex, X_WARNING,
                "first get vblank counter failed: %s\n",
                strerror(errno));
	goto blit_fallback;
    }

    current_msc = seq + msc_delta;
    current_msc &= 0xffffffff;

    /* Flips need to be submitted one frame before */
    if (can_flip(crtc, draw, front, back)) {
	swap_info->type = DRI2_FLIP;
	flip = 1;
    }

    /* Correct target_msc by 'flip' if swap_info->type == DRI2_FLIP.
     * Do it early, so handling of different timing constraints
     * for divisor, remainder and msc vs. target_msc works.
     */
    if (*target_msc > 0)
        *target_msc -= flip;

    /*
     * If divisor is zero, or current_msc is smaller than target_msc
     * we just need to make sure target_msc passes before initiating
     * the swap.
     */
    if (divisor == 0 || current_msc < *target_msc) {
        type = DRM_VBLANK_ABSOLUTE | DRM_VBLANK_EVENT;
        /* If non-pageflipping, but blitting/exchanging, we need to use
         * DRM_VBLANK_NEXTONMISS to avoid unreliable timestamping later
         * on.
         */
        if (flip == 0)
            type |= DRM_VBLANK_NEXTONMISS;

        /* If target_msc already reached or passed, set it to
         * current_msc to ensure we return a reasonable value back
         * to the caller. This makes swap_interval logic more robust.
         */
        if (current_msc >= *target_msc)
            *target_msc = current_msc;

        if (!drmmode_wait_vblank(crtc, type, *target_msc - msc_delta,
				 drm_queue_seq, NULL, &seq)) {
            xf86DrvMsg(scrn->scrnIndex, X_WARNING,
                    "divisor 0 get vblank counter failed: %s\n",
                    strerror(errno));
	    goto blit_fallback;
        }

        *target_msc = seq + flip + msc_delta;
        swap_info->frame = *target_msc;

        return TRUE;
    }

    /*
     * If we get here, target_msc has already passed or we don't have one,
     * and we need to queue an event that will satisfy the divisor/remainder
     * equation.
     */
    type = DRM_VBLANK_ABSOLUTE | DRM_VBLANK_EVENT;
    if (flip == 0)
        type |= DRM_VBLANK_NEXTONMISS;

    event_msc = current_msc - (current_msc % divisor) + remainder - msc_delta;

    /*
     * If the calculated deadline vbl.request.sequence is smaller than
     * or equal to current_msc, it means we've passed the last point
     * when effective onset frame seq could satisfy
     * seq % divisor == remainder, so we need to wait for the next time
     * this will happen.

     * This comparison takes the 1 frame swap delay in pageflipping mode
     * into account, as well as a potential DRM_VBLANK_NEXTONMISS delay
     * if we are blitting/exchanging instead of flipping.
     */
    if (event_msc <= current_msc)
        event_msc += divisor;

    /* Account for 1 frame extra pageflip delay if flip > 0 */
    event_msc -= flip;

    if (!drmmode_wait_vblank(crtc, type, event_msc, drm_queue_seq, NULL, &seq)) {
        xf86DrvMsg(scrn->scrnIndex, X_WARNING,
                "final get vblank counter failed: %s\n",
                strerror(errno));
	goto blit_fallback;
    }

    /* Adjust returned value for 1 fame pageflip offset of flip > 0 */
    *target_msc = seq + flip + msc_delta;
    *target_msc &= 0xffffffff;
    swap_info->frame = *target_msc;

    return TRUE;

blit_fallback:
    if (swap_info) {
	swap_info->type = DRI2_SWAP;
	radeon_dri2_schedule_event(FALLBACK_SWAP_DELAY, swap_info);
    } else {
	box.x1 = 0;
	box.y1 = 0;
	box.x2 = draw->width;
	box.y2 = draw->height;
	REGION_INIT(pScreen, &region, &box, 0);

	radeon_dri2_copy_region2(draw->pScreen, draw, &region, front, back);

	DRI2SwapComplete(client, draw, 0, 0, 0, DRI2_BLIT_COMPLETE, func, data);

	radeon_dri2_unref_buffer(front);
	radeon_dri2_unref_buffer(back);
    }

    *target_msc = 0; /* offscreen, so zero out target vblank count */
    return TRUE;
}


Bool
radeon_dri2_screen_init(ScreenPtr pScreen)
{
    ScrnInfoPtr pScrn = xf86ScreenToScrn(pScreen);
    RADEONEntPtr pRADEONEnt = RADEONEntPriv(pScrn);
    RADEONInfoPtr info = RADEONPTR(pScrn);
    DRI2InfoRec dri2_info = { 0 };
    const char *driverNames[2];
    Bool scheduling_works = TRUE;

    if (!info->dri2.available)
        return FALSE;

    info->dri2.device_name = drmGetDeviceNameFromFd(pRADEONEnt->fd);

    if ( (info->ChipFamily >= CHIP_FAMILY_TAHITI) ) {
        dri2_info.driverName = SI_DRIVER_NAME;
    } else if ( (info->ChipFamily >= CHIP_FAMILY_R600) ) {
        dri2_info.driverName = R600_DRIVER_NAME;
    } else if ( (info->ChipFamily >= CHIP_FAMILY_R300) ) {
        dri2_info.driverName = R300_DRIVER_NAME;
    } else if ( info->ChipFamily >= CHIP_FAMILY_R200 ) {
        dri2_info.driverName = R200_DRIVER_NAME;
    } else {
        dri2_info.driverName = RADEON_DRIVER_NAME;
    }
    dri2_info.fd = pRADEONEnt->fd;
    dri2_info.deviceName = info->dri2.device_name;

    if (info->dri2.pKernelDRMVersion->version_minor < 4) {
	xf86DrvMsg(pScrn->scrnIndex, X_WARNING, "You need a newer kernel for "
		   "sync extension\n");
	scheduling_works = FALSE;
    }

    if (scheduling_works && info->drmmode.count_crtcs > 2) {
#ifdef DRM_CAP_VBLANK_HIGH_CRTC
	uint64_t cap_value;

	if (drmGetCap(pRADEONEnt->fd, DRM_CAP_VBLANK_HIGH_CRTC, &cap_value)) {
	    xf86DrvMsg(pScrn->scrnIndex, X_WARNING, "You need a newer kernel "
		       "for VBLANKs on CRTC > 1\n");
	    scheduling_works = FALSE;
	} else if (!cap_value) {
	    xf86DrvMsg(pScrn->scrnIndex, X_WARNING, "Your kernel does not "
		       "handle VBLANKs on CRTC > 1\n");
	    scheduling_works = FALSE;
	}
#else
	xf86DrvMsg(pScrn->scrnIndex, X_WARNING, "You need to rebuild against a "
		   "newer libdrm to handle VBLANKs on CRTC > 1\n");
	scheduling_works = FALSE;
#endif
    }

    if (scheduling_works) {
        dri2_info.ScheduleSwap = radeon_dri2_schedule_swap;
        dri2_info.GetMSC = radeon_dri2_get_msc;
        dri2_info.ScheduleWaitMSC = radeon_dri2_schedule_wait_msc;
        dri2_info.numDrivers = ARRAY_SIZE(driverNames);
        dri2_info.driverNames = driverNames;
        driverNames[0] = dri2_info.driverName;

        if (info->ChipFamily >= CHIP_FAMILY_R300)
            driverNames[1] = driverNames[0];
        else
            driverNames[1] = NULL; /* no VDPAU support */

	if (DRI2InfoCnt == 0) {
	    if (!dixRegisterPrivateKey(dri2_window_private_key,
				       PRIVATE_WINDOW,
				       sizeof(struct dri2_window_priv))) {
		xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
			   "Failed to get DRI2 window private\n");
		return FALSE;
	    }

	    AddCallback(&ClientStateCallback, radeon_dri2_client_state_changed, 0);
	}

	DRI2InfoCnt++;
    }

    dri2_info.version = 9;
    dri2_info.CreateBuffer2 = radeon_dri2_create_buffer2;
    dri2_info.DestroyBuffer2 = radeon_dri2_destroy_buffer2;
    dri2_info.CopyRegion2 = radeon_dri2_copy_region2;

    info->dri2.enabled = DRI2ScreenInit(pScreen, &dri2_info);
    return info->dri2.enabled;
}

void radeon_dri2_close_screen(ScreenPtr pScreen)
{
    ScrnInfoPtr pScrn = xf86ScreenToScrn(pScreen);
    RADEONInfoPtr info = RADEONPTR(pScrn);

    if (--DRI2InfoCnt == 0)
    	DeleteCallback(&ClientStateCallback, radeon_dri2_client_state_changed, 0);

    DRI2CloseScreen(pScreen);
    drmFree(info->dri2.device_name);
}

#endif /* DRI2 */