summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/drm_damage_helper.c
blob: afb02aae707b4f98f4084d65436166c56b7b5006 (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
// SPDX-License-Identifier: GPL-2.0 OR MIT
/**************************************************************************
 *
 * Copyright (c) 2018 VMware, Inc., Palo Alto, CA., USA
 * 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, sub license, 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
 * THE COPYRIGHT HOLDERS, AUTHORS 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.
 *
 * Authors:
 * Deepak Rawat <drawat@vmware.com>
 * Rob Clark <robdclark@gmail.com>
 *
 **************************************************************************/

#include <drm/drm_atomic.h>
#include <drm/drm_damage_helper.h>
#include <drm/drm_device.h>
#include <drm/drm_framebuffer.h>

static void convert_clip_rect_to_rect(const struct drm_clip_rect *src,
				      struct drm_mode_rect *dest,
				      uint32_t num_clips, uint32_t src_inc)
{
	while (num_clips > 0) {
		dest->x1 = src->x1;
		dest->y1 = src->y1;
		dest->x2 = src->x2;
		dest->y2 = src->y2;
		src += src_inc;
		dest++;
		num_clips--;
	}
}

/**
 * drm_atomic_helper_check_plane_damage - Verify plane damage on atomic_check.
 * @state: The driver state object.
 * @plane_state: Plane state for which to verify damage.
 *
 * This helper function makes sure that damage from plane state is discarded
 * for full modeset. If there are more reasons a driver would want to do a full
 * plane update rather than processing individual damage regions, then those
 * cases should be taken care of here.
 *
 * Note that &drm_plane_state.fb_damage_clips == NULL in plane state means that
 * full plane update should happen. It also ensure helper iterator will return
 * &drm_plane_state.src as damage.
 */
void drm_atomic_helper_check_plane_damage(struct drm_atomic_state *state,
					  struct drm_plane_state *plane_state)
{
	struct drm_crtc_state *crtc_state;

	if (plane_state->crtc) {
		crtc_state = drm_atomic_get_new_crtc_state(state,
							   plane_state->crtc);

		if (WARN_ON(!crtc_state))
			return;

		if (drm_atomic_crtc_needs_modeset(crtc_state)) {
			drm_property_blob_put(plane_state->fb_damage_clips);
			plane_state->fb_damage_clips = NULL;
		}
	}
}
EXPORT_SYMBOL(drm_atomic_helper_check_plane_damage);

/**
 * drm_atomic_helper_dirtyfb - Helper for dirtyfb.
 * @fb: DRM framebuffer.
 * @file_priv: Drm file for the ioctl call.
 * @flags: Dirty fb annotate flags.
 * @color: Color for annotate fill.
 * @clips: Dirty region.
 * @num_clips: Count of clip in clips.
 *
 * A helper to implement &drm_framebuffer_funcs.dirty using damage interface
 * during plane update. If num_clips is 0 then this helper will do a full plane
 * update. This is the same behaviour expected by DIRTFB IOCTL.
 *
 * Note that this helper is blocking implementation. This is what current
 * drivers and userspace expect in their DIRTYFB IOCTL implementation, as a way
 * to rate-limit userspace and make sure its rendering doesn't get ahead of
 * uploading new data too much.
 *
 * Return: Zero on success, negative errno on failure.
 */
int drm_atomic_helper_dirtyfb(struct drm_framebuffer *fb,
			      struct drm_file *file_priv, unsigned int flags,
			      unsigned int color, struct drm_clip_rect *clips,
			      unsigned int num_clips)
{
	struct drm_modeset_acquire_ctx ctx;
	struct drm_property_blob *damage = NULL;
	struct drm_mode_rect *rects = NULL;
	struct drm_atomic_state *state;
	struct drm_plane *plane;
	int ret = 0;

	/*
	 * When called from ioctl, we are interruptible, but not when called
	 * internally (ie. defio worker)
	 */
	drm_modeset_acquire_init(&ctx,
		file_priv ? DRM_MODESET_ACQUIRE_INTERRUPTIBLE : 0);

	state = drm_atomic_state_alloc(fb->dev);
	if (!state) {
		ret = -ENOMEM;
		goto out_drop_locks;
	}
	state->acquire_ctx = &ctx;

	if (clips) {
		uint32_t inc = 1;

		if (flags & DRM_MODE_FB_DIRTY_ANNOTATE_COPY) {
			inc = 2;
			num_clips /= 2;
		}

		rects = kcalloc(num_clips, sizeof(*rects), GFP_KERNEL);
		if (!rects) {
			ret = -ENOMEM;
			goto out;
		}

		convert_clip_rect_to_rect(clips, rects, num_clips, inc);
		damage = drm_property_create_blob(fb->dev,
						  num_clips * sizeof(*rects),
						  rects);
		if (IS_ERR(damage)) {
			ret = PTR_ERR(damage);
			damage = NULL;
			goto out;
		}
	}

retry:
	drm_for_each_plane(plane, fb->dev) {
		struct drm_plane_state *plane_state;

		ret = drm_modeset_lock(&plane->mutex, state->acquire_ctx);
		if (ret)
			goto out;

		if (plane->state->fb != fb) {
			drm_modeset_unlock(&plane->mutex);
			continue;
		}

		plane_state = drm_atomic_get_plane_state(state, plane);
		if (IS_ERR(plane_state)) {
			ret = PTR_ERR(plane_state);
			goto out;
		}

		drm_property_replace_blob(&plane_state->fb_damage_clips,
					  damage);
	}

	ret = drm_atomic_commit(state);

out:
	if (ret == -EDEADLK) {
		drm_atomic_state_clear(state);
		ret = drm_modeset_backoff(&ctx);
		if (!ret)
			goto retry;
	}

	drm_property_blob_put(damage);
	kfree(rects);
	drm_atomic_state_put(state);

out_drop_locks:
	drm_modeset_drop_locks(&ctx);
	drm_modeset_acquire_fini(&ctx);

	return ret;

}
EXPORT_SYMBOL(drm_atomic_helper_dirtyfb);

/**
 * drm_atomic_helper_damage_iter_init - Initialize the damage iterator.
 * @iter: The iterator to initialize.
 * @old_state: Old plane state for validation.
 * @state: Plane state from which to iterate the damage clips.
 *
 * Initialize an iterator, which clips plane damage
 * &drm_plane_state.fb_damage_clips to plane &drm_plane_state.src. This iterator
 * returns full plane src in case damage is not present because either
 * user-space didn't sent or driver discarded it (it want to do full plane
 * update). Currently this iterator returns full plane src in case plane src
 * changed but that can be changed in future to return damage.
 *
 * For the case when plane is not visible or plane update should not happen the
 * first call to iter_next will return false. Note that this helper use clipped
 * &drm_plane_state.src, so driver calling this helper should have called
 * drm_atomic_helper_check_plane_state() earlier.
 */
void
drm_atomic_helper_damage_iter_init(struct drm_atomic_helper_damage_iter *iter,
				   const struct drm_plane_state *old_state,
				   const struct drm_plane_state *state)
{
	struct drm_rect src;
	memset(iter, 0, sizeof(*iter));

	if (!state || !state->crtc || !state->fb || !state->visible)
		return;

	iter->clips = (struct drm_rect *)drm_plane_get_damage_clips(state);
	iter->num_clips = drm_plane_get_damage_clips_count(state);

	/* Round down for x1/y1 and round up for x2/y2 to catch all pixels */
	src = drm_plane_state_src(state);

	iter->plane_src.x1 = src.x1 >> 16;
	iter->plane_src.y1 = src.y1 >> 16;
	iter->plane_src.x2 = (src.x2 >> 16) + !!(src.x2 & 0xFFFF);
	iter->plane_src.y2 = (src.y2 >> 16) + !!(src.y2 & 0xFFFF);

	if (!iter->clips || state->ignore_damage_clips ||
	    !drm_rect_equals(&state->src, &old_state->src)) {
		iter->clips = NULL;
		iter->num_clips = 0;
		iter->full_update = true;
	}
}
EXPORT_SYMBOL(drm_atomic_helper_damage_iter_init);

/**
 * drm_atomic_helper_damage_iter_next - Advance the damage iterator.
 * @iter: The iterator to advance.
 * @rect: Return a rectangle in fb coordinate clipped to plane src.
 *
 * Since plane src is in 16.16 fixed point and damage clips are whole number,
 * this iterator round off clips that intersect with plane src. Round down for
 * x1/y1 and round up for x2/y2 for the intersected coordinate. Similar rounding
 * off for full plane src, in case it's returned as damage. This iterator will
 * skip damage clips outside of plane src.
 *
 * Return: True if the output is valid, false if reached the end.
 *
 * If the first call to iterator next returns false then it means no need to
 * update the plane.
 */
bool
drm_atomic_helper_damage_iter_next(struct drm_atomic_helper_damage_iter *iter,
				   struct drm_rect *rect)
{
	bool ret = false;

	if (iter->full_update) {
		*rect = iter->plane_src;
		iter->full_update = false;
		return true;
	}

	while (iter->curr_clip < iter->num_clips) {
		*rect = iter->clips[iter->curr_clip];
		iter->curr_clip++;

		if (drm_rect_intersect(rect, &iter->plane_src)) {
			ret = true;
			break;
		}
	}

	return ret;
}
EXPORT_SYMBOL(drm_atomic_helper_damage_iter_next);

/**
 * drm_atomic_helper_damage_merged - Merged plane damage
 * @old_state: Old plane state for validation.
 * @state: Plane state from which to iterate the damage clips.
 * @rect: Returns the merged damage rectangle
 *
 * This function merges any valid plane damage clips into one rectangle and
 * returns it in @rect.
 *
 * For details see: drm_atomic_helper_damage_iter_init() and
 * drm_atomic_helper_damage_iter_next().
 *
 * Returns:
 * True if there is valid plane damage otherwise false.
 */
bool drm_atomic_helper_damage_merged(const struct drm_plane_state *old_state,
				     struct drm_plane_state *state,
				     struct drm_rect *rect)
{
	struct drm_atomic_helper_damage_iter iter;
	struct drm_rect clip;
	bool valid = false;

	rect->x1 = INT_MAX;
	rect->y1 = INT_MAX;
	rect->x2 = 0;
	rect->y2 = 0;

	drm_atomic_helper_damage_iter_init(&iter, old_state, state);
	drm_atomic_for_each_plane_damage(&iter, &clip) {
		rect->x1 = min(rect->x1, clip.x1);
		rect->y1 = min(rect->y1, clip.y1);
		rect->x2 = max(rect->x2, clip.x2);
		rect->y2 = max(rect->y2, clip.y2);
		valid = true;
	}

	return valid;
}
EXPORT_SYMBOL(drm_atomic_helper_damage_merged);