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
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* drm gem framebuffer helper functions
*
* Copyright (C) 2017 Noralf Trønnes
*/
#include <linux/slab.h>
#include <linux/module.h>
#include <drm/drm_damage_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_modeset_helper.h>
#include "drm_internal.h"
MODULE_IMPORT_NS("DMA_BUF");
#define AFBC_HEADER_SIZE 16
#define AFBC_TH_LAYOUT_ALIGNMENT 8
#define AFBC_HDR_ALIGN 64
#define AFBC_SUPERBLOCK_PIXELS 256
#define AFBC_SUPERBLOCK_ALIGNMENT 128
#define AFBC_TH_BODY_START_ALIGNMENT 4096
/**
* DOC: overview
*
* This library provides helpers for drivers that don't subclass
* &drm_framebuffer and use &drm_gem_object for their backing storage.
*
* Drivers without additional needs to validate framebuffers can simply use
* drm_gem_fb_create() and everything is wired up automatically. Other drivers
* can use all parts independently.
*/
/**
* drm_gem_fb_get_obj() - Get GEM object backing the framebuffer
* @fb: Framebuffer
* @plane: Plane index
*
* No additional reference is taken beyond the one that the &drm_frambuffer
* already holds.
*
* Returns:
* Pointer to &drm_gem_object for the given framebuffer and plane index or NULL
* if it does not exist.
*/
struct drm_gem_object *drm_gem_fb_get_obj(struct drm_framebuffer *fb,
unsigned int plane)
{
struct drm_device *dev = fb->dev;
if (drm_WARN_ON_ONCE(dev, plane >= ARRAY_SIZE(fb->obj)))
return NULL;
else if (drm_WARN_ON_ONCE(dev, !fb->obj[plane]))
return NULL;
return fb->obj[plane];
}
EXPORT_SYMBOL_GPL(drm_gem_fb_get_obj);
static int
drm_gem_fb_init(struct drm_device *dev,
struct drm_framebuffer *fb,
const struct drm_mode_fb_cmd2 *mode_cmd,
struct drm_gem_object **obj, unsigned int num_planes,
const struct drm_framebuffer_funcs *funcs)
{
unsigned int i;
int ret;
drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
for (i = 0; i < num_planes; i++)
fb->obj[i] = obj[i];
ret = drm_framebuffer_init(dev, fb, funcs);
if (ret)
drm_err(dev, "Failed to init framebuffer: %d\n", ret);
return ret;
}
/**
* drm_gem_fb_destroy - Free GEM backed framebuffer
* @fb: Framebuffer
*
* Frees a GEM backed framebuffer with its backing buffer(s) and the structure
* itself. Drivers can use this as their &drm_framebuffer_funcs->destroy
* callback.
*/
void drm_gem_fb_destroy(struct drm_framebuffer *fb)
{
unsigned int i;
for (i = 0; i < fb->format->num_planes; i++)
drm_gem_object_put(fb->obj[i]);
drm_framebuffer_cleanup(fb);
kfree(fb);
}
EXPORT_SYMBOL(drm_gem_fb_destroy);
/**
* drm_gem_fb_create_handle - Create handle for GEM backed framebuffer
* @fb: Framebuffer
* @file: DRM file to register the handle for
* @handle: Pointer to return the created handle
*
* This function creates a handle for the GEM object backing the framebuffer.
* Drivers can use this as their &drm_framebuffer_funcs->create_handle
* callback. The GETFB IOCTL calls into this callback.
*
* Returns:
* 0 on success or a negative error code on failure.
*/
int drm_gem_fb_create_handle(struct drm_framebuffer *fb, struct drm_file *file,
unsigned int *handle)
{
return drm_gem_handle_create(file, fb->obj[0], handle);
}
EXPORT_SYMBOL(drm_gem_fb_create_handle);
/**
* drm_gem_fb_init_with_funcs() - Helper function for implementing
* &drm_mode_config_funcs.fb_create
* callback in cases when the driver
* allocates a subclass of
* struct drm_framebuffer
* @dev: DRM device
* @fb: framebuffer object
* @file: DRM file that holds the GEM handle(s) backing the framebuffer
* @mode_cmd: Metadata from the userspace framebuffer creation request
* @funcs: vtable to be used for the new framebuffer object
*
* This function can be used to set &drm_framebuffer_funcs for drivers that need
* custom framebuffer callbacks. Use drm_gem_fb_create() if you don't need to
* change &drm_framebuffer_funcs. The function does buffer size validation.
* The buffer size validation is for a general case, though, so users should
* pay attention to the checks being appropriate for them or, at least,
* non-conflicting.
*
* Returns:
* Zero or a negative error code.
*/
int drm_gem_fb_init_with_funcs(struct drm_device *dev,
struct drm_framebuffer *fb,
struct drm_file *file,
const struct drm_mode_fb_cmd2 *mode_cmd,
const struct drm_framebuffer_funcs *funcs)
{
const struct drm_format_info *info;
struct drm_gem_object *objs[DRM_FORMAT_MAX_PLANES];
unsigned int i;
int ret;
info = drm_get_format_info(dev, mode_cmd);
if (!info) {
drm_dbg_kms(dev, "Failed to get FB format info\n");
return -EINVAL;
}
if (drm_drv_uses_atomic_modeset(dev) &&
!drm_any_plane_has_format(dev, mode_cmd->pixel_format,
mode_cmd->modifier[0])) {
drm_dbg_kms(dev, "Unsupported pixel format %p4cc / modifier 0x%llx\n",
&mode_cmd->pixel_format, mode_cmd->modifier[0]);
return -EINVAL;
}
for (i = 0; i < info->num_planes; i++) {
unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
unsigned int min_size;
objs[i] = drm_gem_object_lookup(file, mode_cmd->handles[i]);
if (!objs[i]) {
drm_dbg_kms(dev, "Failed to lookup GEM object\n");
ret = -ENOENT;
goto err_gem_object_put;
}
min_size = (height - 1) * mode_cmd->pitches[i]
+ drm_format_info_min_pitch(info, i, width)
+ mode_cmd->offsets[i];
if (objs[i]->size < min_size) {
drm_dbg_kms(dev,
"GEM object size (%zu) smaller than minimum size (%u) for plane %d\n",
objs[i]->size, min_size, i);
drm_gem_object_put(objs[i]);
ret = -EINVAL;
goto err_gem_object_put;
}
}
ret = drm_gem_fb_init(dev, fb, mode_cmd, objs, i, funcs);
if (ret)
goto err_gem_object_put;
return 0;
err_gem_object_put:
while (i > 0) {
--i;
drm_gem_object_put(objs[i]);
}
return ret;
}
EXPORT_SYMBOL_GPL(drm_gem_fb_init_with_funcs);
/**
* drm_gem_fb_create_with_funcs() - Helper function for the
* &drm_mode_config_funcs.fb_create
* callback
* @dev: DRM device
* @file: DRM file that holds the GEM handle(s) backing the framebuffer
* @mode_cmd: Metadata from the userspace framebuffer creation request
* @funcs: vtable to be used for the new framebuffer object
*
* This function can be used to set &drm_framebuffer_funcs for drivers that need
* custom framebuffer callbacks. Use drm_gem_fb_create() if you don't need to
* change &drm_framebuffer_funcs. The function does buffer size validation.
*
* Returns:
* Pointer to a &drm_framebuffer on success or an error pointer on failure.
*/
struct drm_framebuffer *
drm_gem_fb_create_with_funcs(struct drm_device *dev, struct drm_file *file,
const struct drm_mode_fb_cmd2 *mode_cmd,
const struct drm_framebuffer_funcs *funcs)
{
struct drm_framebuffer *fb;
int ret;
fb = kzalloc(sizeof(*fb), GFP_KERNEL);
if (!fb)
return ERR_PTR(-ENOMEM);
ret = drm_gem_fb_init_with_funcs(dev, fb, file, mode_cmd, funcs);
if (ret) {
kfree(fb);
return ERR_PTR(ret);
}
return fb;
}
EXPORT_SYMBOL_GPL(drm_gem_fb_create_with_funcs);
static const struct drm_framebuffer_funcs drm_gem_fb_funcs = {
.destroy = drm_gem_fb_destroy,
.create_handle = drm_gem_fb_create_handle,
};
/**
* drm_gem_fb_create() - Helper function for the
* &drm_mode_config_funcs.fb_create callback
* @dev: DRM device
* @file: DRM file that holds the GEM handle(s) backing the framebuffer
* @mode_cmd: Metadata from the userspace framebuffer creation request
*
* This function creates a new framebuffer object described by
* &drm_mode_fb_cmd2. This description includes handles for the buffer(s)
* backing the framebuffer.
*
* If your hardware has special alignment or pitch requirements these should be
* checked before calling this function. The function does buffer size
* validation. Use drm_gem_fb_create_with_dirty() if you need framebuffer
* flushing.
*
* Drivers can use this as their &drm_mode_config_funcs.fb_create callback.
* The ADDFB2 IOCTL calls into this callback.
*
* Returns:
* Pointer to a &drm_framebuffer on success or an error pointer on failure.
*/
struct drm_framebuffer *
drm_gem_fb_create(struct drm_device *dev, struct drm_file *file,
const struct drm_mode_fb_cmd2 *mode_cmd)
{
return drm_gem_fb_create_with_funcs(dev, file, mode_cmd,
&drm_gem_fb_funcs);
}
EXPORT_SYMBOL_GPL(drm_gem_fb_create);
static const struct drm_framebuffer_funcs drm_gem_fb_funcs_dirtyfb = {
.destroy = drm_gem_fb_destroy,
.create_handle = drm_gem_fb_create_handle,
.dirty = drm_atomic_helper_dirtyfb,
};
/**
* drm_gem_fb_create_with_dirty() - Helper function for the
* &drm_mode_config_funcs.fb_create callback
* @dev: DRM device
* @file: DRM file that holds the GEM handle(s) backing the framebuffer
* @mode_cmd: Metadata from the userspace framebuffer creation request
*
* This function creates a new framebuffer object described by
* &drm_mode_fb_cmd2. This description includes handles for the buffer(s)
* backing the framebuffer. drm_atomic_helper_dirtyfb() is used for the dirty
* callback giving framebuffer flushing through the atomic machinery. Use
* drm_gem_fb_create() if you don't need the dirty callback.
* The function does buffer size validation.
*
* Drivers should also call drm_plane_enable_fb_damage_clips() on all planes
* to enable userspace to use damage clips also with the ATOMIC IOCTL.
*
* Drivers can use this as their &drm_mode_config_funcs.fb_create callback.
* The ADDFB2 IOCTL calls into this callback.
*
* Returns:
* Pointer to a &drm_framebuffer on success or an error pointer on failure.
*/
struct drm_framebuffer *
drm_gem_fb_create_with_dirty(struct drm_device *dev, struct drm_file *file,
const struct drm_mode_fb_cmd2 *mode_cmd)
{
return drm_gem_fb_create_with_funcs(dev, file, mode_cmd,
&drm_gem_fb_funcs_dirtyfb);
}
EXPORT_SYMBOL_GPL(drm_gem_fb_create_with_dirty);
/**
* drm_gem_fb_vmap - maps all framebuffer BOs into kernel address space
* @fb: the framebuffer
* @map: returns the mapping's address for each BO
* @data: returns the data address for each BO, can be NULL
*
* This function maps all buffer objects of the given framebuffer into
* kernel address space and stores them in struct iosys_map. If the
* mapping operation fails for one of the BOs, the function unmaps the
* already established mappings automatically.
*
* Callers that want to access a BO's stored data should pass @data.
* The argument returns the addresses of the data stored in each BO. This
* is different from @map if the framebuffer's offsets field is non-zero.
*
* Both, @map and @data, must each refer to arrays with at least
* fb->format->num_planes elements.
*
* See drm_gem_fb_vunmap() for unmapping.
*
* Returns:
* 0 on success, or a negative errno code otherwise.
*/
int drm_gem_fb_vmap(struct drm_framebuffer *fb, struct iosys_map *map,
struct iosys_map *data)
{
struct drm_gem_object *obj;
unsigned int i;
int ret;
for (i = 0; i < fb->format->num_planes; ++i) {
obj = drm_gem_fb_get_obj(fb, i);
if (!obj) {
ret = -EINVAL;
goto err_drm_gem_vunmap;
}
ret = drm_gem_vmap_unlocked(obj, &map[i]);
if (ret)
goto err_drm_gem_vunmap;
}
if (data) {
for (i = 0; i < fb->format->num_planes; ++i) {
memcpy(&data[i], &map[i], sizeof(data[i]));
if (iosys_map_is_null(&data[i]))
continue;
iosys_map_incr(&data[i], fb->offsets[i]);
}
}
return 0;
err_drm_gem_vunmap:
while (i) {
--i;
obj = drm_gem_fb_get_obj(fb, i);
if (!obj)
continue;
drm_gem_vunmap_unlocked(obj, &map[i]);
}
return ret;
}
EXPORT_SYMBOL(drm_gem_fb_vmap);
/**
* drm_gem_fb_vunmap - unmaps framebuffer BOs from kernel address space
* @fb: the framebuffer
* @map: mapping addresses as returned by drm_gem_fb_vmap()
*
* This function unmaps all buffer objects of the given framebuffer.
*
* See drm_gem_fb_vmap() for more information.
*/
void drm_gem_fb_vunmap(struct drm_framebuffer *fb, struct iosys_map *map)
{
unsigned int i = fb->format->num_planes;
struct drm_gem_object *obj;
while (i) {
--i;
obj = drm_gem_fb_get_obj(fb, i);
if (!obj)
continue;
if (iosys_map_is_null(&map[i]))
continue;
drm_gem_vunmap_unlocked(obj, &map[i]);
}
}
EXPORT_SYMBOL(drm_gem_fb_vunmap);
static void __drm_gem_fb_end_cpu_access(struct drm_framebuffer *fb, enum dma_data_direction dir,
unsigned int num_planes)
{
struct dma_buf_attachment *import_attach;
struct drm_gem_object *obj;
int ret;
while (num_planes) {
--num_planes;
obj = drm_gem_fb_get_obj(fb, num_planes);
if (!obj)
continue;
import_attach = obj->import_attach;
if (!import_attach)
continue;
ret = dma_buf_end_cpu_access(import_attach->dmabuf, dir);
if (ret)
drm_err(fb->dev, "dma_buf_end_cpu_access(%u, %d) failed: %d\n",
ret, num_planes, dir);
}
}
/**
* drm_gem_fb_begin_cpu_access - prepares GEM buffer objects for CPU access
* @fb: the framebuffer
* @dir: access mode
*
* Prepares a framebuffer's GEM buffer objects for CPU access. This function
* must be called before accessing the BO data within the kernel. For imported
* BOs, the function calls dma_buf_begin_cpu_access().
*
* See drm_gem_fb_end_cpu_access() for signalling the end of CPU access.
*
* Returns:
* 0 on success, or a negative errno code otherwise.
*/
int drm_gem_fb_begin_cpu_access(struct drm_framebuffer *fb, enum dma_data_direction dir)
{
struct dma_buf_attachment *import_attach;
struct drm_gem_object *obj;
unsigned int i;
int ret;
for (i = 0; i < fb->format->num_planes; ++i) {
obj = drm_gem_fb_get_obj(fb, i);
if (!obj) {
ret = -EINVAL;
goto err___drm_gem_fb_end_cpu_access;
}
import_attach = obj->import_attach;
if (!import_attach)
continue;
ret = dma_buf_begin_cpu_access(import_attach->dmabuf, dir);
if (ret)
goto err___drm_gem_fb_end_cpu_access;
}
return 0;
err___drm_gem_fb_end_cpu_access:
__drm_gem_fb_end_cpu_access(fb, dir, i);
return ret;
}
EXPORT_SYMBOL(drm_gem_fb_begin_cpu_access);
/**
* drm_gem_fb_end_cpu_access - signals end of CPU access to GEM buffer objects
* @fb: the framebuffer
* @dir: access mode
*
* Signals the end of CPU access to the given framebuffer's GEM buffer objects. This
* function must be paired with a corresponding call to drm_gem_fb_begin_cpu_access().
* For imported BOs, the function calls dma_buf_end_cpu_access().
*
* See also drm_gem_fb_begin_cpu_access().
*/
void drm_gem_fb_end_cpu_access(struct drm_framebuffer *fb, enum dma_data_direction dir)
{
__drm_gem_fb_end_cpu_access(fb, dir, fb->format->num_planes);
}
EXPORT_SYMBOL(drm_gem_fb_end_cpu_access);
// TODO Drop this function and replace by drm_format_info_bpp() once all
// DRM_FORMAT_* provide proper block info in drivers/gpu/drm/drm_fourcc.c
static __u32 drm_gem_afbc_get_bpp(struct drm_device *dev,
const struct drm_mode_fb_cmd2 *mode_cmd)
{
const struct drm_format_info *info;
info = drm_get_format_info(dev, mode_cmd);
switch (info->format) {
case DRM_FORMAT_YUV420_8BIT:
return 12;
case DRM_FORMAT_YUV420_10BIT:
return 15;
case DRM_FORMAT_VUY101010:
return 30;
default:
return drm_format_info_bpp(info, 0);
}
}
static int drm_gem_afbc_min_size(struct drm_device *dev,
const struct drm_mode_fb_cmd2 *mode_cmd,
struct drm_afbc_framebuffer *afbc_fb)
{
__u32 n_blocks, w_alignment, h_alignment, hdr_alignment;
/* remove bpp when all users properly encode cpp in drm_format_info */
__u32 bpp;
switch (mode_cmd->modifier[0] & AFBC_FORMAT_MOD_BLOCK_SIZE_MASK) {
case AFBC_FORMAT_MOD_BLOCK_SIZE_16x16:
afbc_fb->block_width = 16;
afbc_fb->block_height = 16;
break;
case AFBC_FORMAT_MOD_BLOCK_SIZE_32x8:
afbc_fb->block_width = 32;
afbc_fb->block_height = 8;
break;
/* no user exists yet - fall through */
case AFBC_FORMAT_MOD_BLOCK_SIZE_64x4:
case AFBC_FORMAT_MOD_BLOCK_SIZE_32x8_64x4:
default:
drm_dbg_kms(dev, "Invalid AFBC_FORMAT_MOD_BLOCK_SIZE: %lld.\n",
mode_cmd->modifier[0]
& AFBC_FORMAT_MOD_BLOCK_SIZE_MASK);
return -EINVAL;
}
/* tiled header afbc */
w_alignment = afbc_fb->block_width;
h_alignment = afbc_fb->block_height;
hdr_alignment = AFBC_HDR_ALIGN;
if (mode_cmd->modifier[0] & AFBC_FORMAT_MOD_TILED) {
w_alignment *= AFBC_TH_LAYOUT_ALIGNMENT;
h_alignment *= AFBC_TH_LAYOUT_ALIGNMENT;
hdr_alignment = AFBC_TH_BODY_START_ALIGNMENT;
}
afbc_fb->aligned_width = ALIGN(mode_cmd->width, w_alignment);
afbc_fb->aligned_height = ALIGN(mode_cmd->height, h_alignment);
afbc_fb->offset = mode_cmd->offsets[0];
bpp = drm_gem_afbc_get_bpp(dev, mode_cmd);
if (!bpp) {
drm_dbg_kms(dev, "Invalid AFBC bpp value: %d\n", bpp);
return -EINVAL;
}
n_blocks = (afbc_fb->aligned_width * afbc_fb->aligned_height)
/ AFBC_SUPERBLOCK_PIXELS;
afbc_fb->afbc_size = ALIGN(n_blocks * AFBC_HEADER_SIZE, hdr_alignment);
afbc_fb->afbc_size += n_blocks * ALIGN(bpp * AFBC_SUPERBLOCK_PIXELS / 8,
AFBC_SUPERBLOCK_ALIGNMENT);
return 0;
}
/**
* drm_gem_fb_afbc_init() - Helper function for drivers using afbc to
* fill and validate all the afbc-specific
* struct drm_afbc_framebuffer members
*
* @dev: DRM device
* @afbc_fb: afbc-specific framebuffer
* @mode_cmd: Metadata from the userspace framebuffer creation request
* @afbc_fb: afbc framebuffer
*
* This function can be used by drivers which support afbc to complete
* the preparation of struct drm_afbc_framebuffer. It must be called after
* allocating the said struct and calling drm_gem_fb_init_with_funcs().
* It is caller's responsibility to put afbc_fb->base.obj objects in case
* the call is unsuccessful.
*
* Returns:
* Zero on success or a negative error value on failure.
*/
int drm_gem_fb_afbc_init(struct drm_device *dev,
const struct drm_mode_fb_cmd2 *mode_cmd,
struct drm_afbc_framebuffer *afbc_fb)
{
const struct drm_format_info *info;
struct drm_gem_object **objs;
int ret;
objs = afbc_fb->base.obj;
info = drm_get_format_info(dev, mode_cmd);
if (!info)
return -EINVAL;
ret = drm_gem_afbc_min_size(dev, mode_cmd, afbc_fb);
if (ret < 0)
return ret;
if (objs[0]->size < afbc_fb->afbc_size)
return -EINVAL;
return 0;
}
EXPORT_SYMBOL_GPL(drm_gem_fb_afbc_init);
|