summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/vkms/vkms_crc.c
blob: e66ff25c008e6c10e3de7b9294a607e7efbb1015 (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
// SPDX-License-Identifier: GPL-2.0+

#include "vkms_drv.h"
#include <linux/crc32.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>

/**
 * compute_crc - Compute CRC value on output frame
 *
 * @vaddr_out: address to final framebuffer
 * @crc_out: framebuffer's metadata
 *
 * returns CRC value computed using crc32 on the visible portion of
 * the final framebuffer at vaddr_out
 */
static uint32_t compute_crc(void *vaddr_out, struct vkms_crc_data *crc_out)
{
	int i, j, src_offset;
	int x_src = crc_out->src.x1 >> 16;
	int y_src = crc_out->src.y1 >> 16;
	int h_src = drm_rect_height(&crc_out->src) >> 16;
	int w_src = drm_rect_width(&crc_out->src) >> 16;
	u32 crc = 0;

	for (i = y_src; i < y_src + h_src; ++i) {
		for (j = x_src; j < x_src + w_src; ++j) {
			src_offset = crc_out->offset
				     + (i * crc_out->pitch)
				     + (j * crc_out->cpp);
			/* XRGB format ignores Alpha channel */
			memset(vaddr_out + src_offset + 24, 0,  8);
			crc = crc32_le(crc, vaddr_out + src_offset,
				       sizeof(u32));
		}
	}

	return crc;
}

/**
 * blend - belnd value at vaddr_src with value at vaddr_dst
 * @vaddr_dst: destination address
 * @vaddr_src: source address
 * @crc_dst: destination framebuffer's metadata
 * @crc_src: source framebuffer's metadata
 *
 * Blend value at vaddr_src with value at vaddr_dst.
 * Currently, this function write value at vaddr_src on value
 * at vaddr_dst using buffer's metadata to locate the new values
 * from vaddr_src and their distenation at vaddr_dst.
 *
 * Todo: Use the alpha value to blend vaddr_src with vaddr_dst
 *	 instead of overwriting it.
 */
static void blend(void *vaddr_dst, void *vaddr_src,
		  struct vkms_crc_data *crc_dst,
		  struct vkms_crc_data *crc_src)
{
	int i, j, j_dst, i_dst;
	int offset_src, offset_dst;

	int x_src = crc_src->src.x1 >> 16;
	int y_src = crc_src->src.y1 >> 16;

	int x_dst = crc_src->dst.x1;
	int y_dst = crc_src->dst.y1;
	int h_dst = drm_rect_height(&crc_src->dst);
	int w_dst = drm_rect_width(&crc_src->dst);

	int y_limit = y_src + h_dst;
	int x_limit = x_src + w_dst;

	for (i = y_src, i_dst = y_dst; i < y_limit; ++i) {
		for (j = x_src, j_dst = x_dst; j < x_limit; ++j) {
			offset_dst = crc_dst->offset
				     + (i_dst * crc_dst->pitch)
				     + (j_dst++ * crc_dst->cpp);
			offset_src = crc_src->offset
				     + (i * crc_src->pitch)
				     + (j * crc_src->cpp);

			memcpy(vaddr_dst + offset_dst,
			       vaddr_src + offset_src, sizeof(u32));
		}
		i_dst++;
	}
}

static void compose_cursor(struct vkms_crc_data *cursor_crc,
			   struct vkms_crc_data *primary_crc, void *vaddr_out)
{
	struct drm_gem_object *cursor_obj;
	struct vkms_gem_object *cursor_vkms_obj;

	cursor_obj = drm_gem_fb_get_obj(&cursor_crc->fb, 0);
	cursor_vkms_obj = drm_gem_to_vkms_gem(cursor_obj);

	mutex_lock(&cursor_vkms_obj->pages_lock);
	if (!cursor_vkms_obj->vaddr) {
		DRM_WARN("cursor plane vaddr is NULL");
		goto out;
	}

	blend(vaddr_out, cursor_vkms_obj->vaddr, primary_crc, cursor_crc);

out:
	mutex_unlock(&cursor_vkms_obj->pages_lock);
}

static uint32_t _vkms_get_crc(struct vkms_crc_data *primary_crc,
			      struct vkms_crc_data *cursor_crc)
{
	struct drm_framebuffer *fb = &primary_crc->fb;
	struct drm_gem_object *gem_obj = drm_gem_fb_get_obj(fb, 0);
	struct vkms_gem_object *vkms_obj = drm_gem_to_vkms_gem(gem_obj);
	void *vaddr_out = kzalloc(vkms_obj->gem.size, GFP_KERNEL);
	u32 crc = 0;

	if (!vaddr_out) {
		DRM_ERROR("Failed to allocate memory for output frame.");
		return 0;
	}

	mutex_lock(&vkms_obj->pages_lock);
	if (WARN_ON(!vkms_obj->vaddr)) {
		mutex_unlock(&vkms_obj->pages_lock);
		kfree(vaddr_out);
		return crc;
	}

	memcpy(vaddr_out, vkms_obj->vaddr, vkms_obj->gem.size);
	mutex_unlock(&vkms_obj->pages_lock);

	if (cursor_crc)
		compose_cursor(cursor_crc, primary_crc, vaddr_out);

	crc = compute_crc(vaddr_out, primary_crc);

	kfree(vaddr_out);

	return crc;
}

/**
 * vkms_crc_work_handle - ordered work_struct to compute CRC
 *
 * @work: work_struct
 *
 * Work handler for computing CRCs. work_struct scheduled in
 * an ordered workqueue that's periodically scheduled to run by
 * _vblank_handle() and flushed at vkms_atomic_crtc_destroy_state().
 */
void vkms_crc_work_handle(struct work_struct *work)
{
	struct vkms_crtc_state *crtc_state = container_of(work,
						struct vkms_crtc_state,
						crc_work);
	struct drm_crtc *crtc = crtc_state->base.crtc;
	struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
	struct vkms_device *vdev = container_of(out, struct vkms_device,
						output);
	struct vkms_crc_data *primary_crc = NULL;
	struct vkms_crc_data *cursor_crc = NULL;
	struct drm_plane *plane;
	u32 crc32 = 0;
	u64 frame_start, frame_end;
	unsigned long flags;

	spin_lock_irqsave(&out->state_lock, flags);
	frame_start = crtc_state->frame_start;
	frame_end = crtc_state->frame_end;
	spin_unlock_irqrestore(&out->state_lock, flags);

	/* _vblank_handle() hasn't updated frame_start yet */
	if (!frame_start || frame_start == frame_end)
		goto out;

	drm_for_each_plane(plane, &vdev->drm) {
		struct vkms_plane_state *vplane_state;
		struct vkms_crc_data *crc_data;

		vplane_state = to_vkms_plane_state(plane->state);
		crc_data = vplane_state->crc_data;

		if (drm_framebuffer_read_refcount(&crc_data->fb) == 0)
			continue;

		if (plane->type == DRM_PLANE_TYPE_PRIMARY)
			primary_crc = crc_data;
		else
			cursor_crc = crc_data;
	}

	if (primary_crc)
		crc32 = _vkms_get_crc(primary_crc, cursor_crc);

	frame_end = drm_crtc_accurate_vblank_count(crtc);

	/* queue_work can fail to schedule crc_work; add crc for
	 * missing frames
	 */
	while (frame_start <= frame_end)
		drm_crtc_add_crc_entry(crtc, true, frame_start++, &crc32);

out:
	/* to avoid using the same value for frame number again */
	spin_lock_irqsave(&out->state_lock, flags);
	crtc_state->frame_end = frame_end;
	crtc_state->frame_start = 0;
	spin_unlock_irqrestore(&out->state_lock, flags);
}

static const char * const pipe_crc_sources[] = {"auto"};

const char *const *vkms_get_crc_sources(struct drm_crtc *crtc,
					size_t *count)
{
	*count = ARRAY_SIZE(pipe_crc_sources);
	return pipe_crc_sources;
}

static int vkms_crc_parse_source(const char *src_name, bool *enabled)
{
	int ret = 0;

	if (!src_name) {
		*enabled = false;
	} else if (strcmp(src_name, "auto") == 0) {
		*enabled = true;
	} else {
		*enabled = false;
		ret = -EINVAL;
	}

	return ret;
}

int vkms_verify_crc_source(struct drm_crtc *crtc, const char *src_name,
			   size_t *values_cnt)
{
	bool enabled;

	if (vkms_crc_parse_source(src_name, &enabled) < 0) {
		DRM_DEBUG_DRIVER("unknown source %s\n", src_name);
		return -EINVAL;
	}

	*values_cnt = 1;

	return 0;
}

int vkms_set_crc_source(struct drm_crtc *crtc, const char *src_name)
{
	struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
	bool enabled = false;
	unsigned long flags;
	int ret = 0;

	ret = vkms_crc_parse_source(src_name, &enabled);

	/* make sure nothing is scheduled on crtc workq */
	flush_workqueue(out->crc_workq);

	spin_lock_irqsave(&out->lock, flags);
	out->crc_enabled = enabled;
	spin_unlock_irqrestore(&out->lock, flags);

	return ret;
}