1
2
3#include <linux/crc32.h>
4
5#include <drm/drm_atomic.h>
6#include <drm/drm_atomic_helper.h>
7#include <drm/drm_gem_framebuffer_helper.h>
8#include <drm/drm_vblank.h>
9
10#include "vkms_drv.h"
11
12static u32 get_pixel_from_buffer(int x, int y, const u8 *buffer,
13 const struct vkms_composer *composer)
14{
15 u32 pixel;
16 int src_offset = composer->offset + (y * composer->pitch)
17 + (x * composer->cpp);
18
19 pixel = *(u32 *)&buffer[src_offset];
20
21 return pixel;
22}
23
24
25
26
27
28
29
30
31
32
33static uint32_t compute_crc(const u8 *vaddr,
34 const struct vkms_composer *composer)
35{
36 int x, y;
37 u32 crc = 0, pixel = 0;
38 int x_src = composer->src.x1 >> 16;
39 int y_src = composer->src.y1 >> 16;
40 int h_src = drm_rect_height(&composer->src) >> 16;
41 int w_src = drm_rect_width(&composer->src) >> 16;
42
43 for (y = y_src; y < y_src + h_src; ++y) {
44 for (x = x_src; x < x_src + w_src; ++x) {
45 pixel = get_pixel_from_buffer(x, y, vaddr, composer);
46 crc = crc32_le(crc, (void *)&pixel, sizeof(u32));
47 }
48 }
49
50 return crc;
51}
52
53static u8 blend_channel(u8 src, u8 dst, u8 alpha)
54{
55 u32 pre_blend;
56 u8 new_color;
57
58 pre_blend = (src * 255 + dst * (255 - alpha));
59
60
61 new_color = ((pre_blend + ((pre_blend + 257) >> 8)) >> 8);
62
63 return new_color;
64}
65
66static void alpha_blending(const u8 *argb_src, u8 *argb_dst)
67{
68 u8 alpha;
69
70 alpha = argb_src[3];
71 argb_dst[0] = blend_channel(argb_src[0], argb_dst[0], alpha);
72 argb_dst[1] = blend_channel(argb_src[1], argb_dst[1], alpha);
73 argb_dst[2] = blend_channel(argb_src[2], argb_dst[2], alpha);
74
75 argb_dst[3] = 0xFF;
76}
77
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88
89
90
91static void blend(void *vaddr_dst, void *vaddr_src,
92 struct vkms_composer *dst_composer,
93 struct vkms_composer *src_composer)
94{
95 int i, j, j_dst, i_dst;
96 int offset_src, offset_dst;
97 u8 *pixel_dst, *pixel_src;
98
99 int x_src = src_composer->src.x1 >> 16;
100 int y_src = src_composer->src.y1 >> 16;
101
102 int x_dst = src_composer->dst.x1;
103 int y_dst = src_composer->dst.y1;
104 int h_dst = drm_rect_height(&src_composer->dst);
105 int w_dst = drm_rect_width(&src_composer->dst);
106
107 int y_limit = y_src + h_dst;
108 int x_limit = x_src + w_dst;
109
110 for (i = y_src, i_dst = y_dst; i < y_limit; ++i) {
111 for (j = x_src, j_dst = x_dst; j < x_limit; ++j) {
112 offset_dst = dst_composer->offset
113 + (i_dst * dst_composer->pitch)
114 + (j_dst++ * dst_composer->cpp);
115 offset_src = src_composer->offset
116 + (i * src_composer->pitch)
117 + (j * src_composer->cpp);
118
119 pixel_src = (u8 *)(vaddr_src + offset_src);
120 pixel_dst = (u8 *)(vaddr_dst + offset_dst);
121 alpha_blending(pixel_src, pixel_dst);
122 }
123 i_dst++;
124 }
125}
126
127static void compose_cursor(struct vkms_composer *cursor_composer,
128 struct vkms_composer *primary_composer,
129 void *vaddr_out)
130{
131 struct drm_gem_object *cursor_obj;
132 struct vkms_gem_object *cursor_vkms_obj;
133
134 cursor_obj = drm_gem_fb_get_obj(&cursor_composer->fb, 0);
135 cursor_vkms_obj = drm_gem_to_vkms_gem(cursor_obj);
136
137 if (WARN_ON(!cursor_vkms_obj->vaddr))
138 return;
139
140 blend(vaddr_out, cursor_vkms_obj->vaddr,
141 primary_composer, cursor_composer);
142}
143
144static int compose_planes(void **vaddr_out,
145 struct vkms_composer *primary_composer,
146 struct vkms_composer *cursor_composer)
147{
148 struct drm_framebuffer *fb = &primary_composer->fb;
149 struct drm_gem_object *gem_obj = drm_gem_fb_get_obj(fb, 0);
150 struct vkms_gem_object *vkms_obj = drm_gem_to_vkms_gem(gem_obj);
151
152 if (!*vaddr_out) {
153 *vaddr_out = kzalloc(vkms_obj->gem.size, GFP_KERNEL);
154 if (!*vaddr_out) {
155 DRM_ERROR("Cannot allocate memory for output frame.");
156 return -ENOMEM;
157 }
158 }
159
160 if (WARN_ON(!vkms_obj->vaddr))
161 return -EINVAL;
162
163 memcpy(*vaddr_out, vkms_obj->vaddr, vkms_obj->gem.size);
164
165 if (cursor_composer)
166 compose_cursor(cursor_composer, primary_composer, *vaddr_out);
167
168 return 0;
169}
170
171
172
173
174
175
176
177
178
179
180void vkms_composer_worker(struct work_struct *work)
181{
182 struct vkms_crtc_state *crtc_state = container_of(work,
183 struct vkms_crtc_state,
184 composer_work);
185 struct drm_crtc *crtc = crtc_state->base.crtc;
186 struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
187 struct vkms_composer *primary_composer = NULL;
188 struct vkms_composer *cursor_composer = NULL;
189 bool crc_pending, wb_pending;
190 void *vaddr_out = NULL;
191 u32 crc32 = 0;
192 u64 frame_start, frame_end;
193 int ret;
194
195 spin_lock_irq(&out->composer_lock);
196 frame_start = crtc_state->frame_start;
197 frame_end = crtc_state->frame_end;
198 crc_pending = crtc_state->crc_pending;
199 wb_pending = crtc_state->wb_pending;
200 crtc_state->frame_start = 0;
201 crtc_state->frame_end = 0;
202 crtc_state->crc_pending = false;
203 spin_unlock_irq(&out->composer_lock);
204
205
206
207
208
209 if (!crc_pending)
210 return;
211
212 if (crtc_state->num_active_planes >= 1)
213 primary_composer = crtc_state->active_planes[0]->composer;
214
215 if (crtc_state->num_active_planes == 2)
216 cursor_composer = crtc_state->active_planes[1]->composer;
217
218 if (!primary_composer)
219 return;
220
221 if (wb_pending)
222 vaddr_out = crtc_state->active_writeback;
223
224 ret = compose_planes(&vaddr_out, primary_composer, cursor_composer);
225 if (ret) {
226 if (ret == -EINVAL && !wb_pending)
227 kfree(vaddr_out);
228 return;
229 }
230
231 crc32 = compute_crc(vaddr_out, primary_composer);
232
233 if (wb_pending) {
234 drm_writeback_signal_completion(&out->wb_connector, 0);
235 spin_lock_irq(&out->composer_lock);
236 crtc_state->wb_pending = false;
237 spin_unlock_irq(&out->composer_lock);
238 } else {
239 kfree(vaddr_out);
240 }
241
242
243
244
245 while (frame_start <= frame_end)
246 drm_crtc_add_crc_entry(crtc, true, frame_start++, &crc32);
247}
248
249static const char * const pipe_crc_sources[] = {"auto"};
250
251const char *const *vkms_get_crc_sources(struct drm_crtc *crtc,
252 size_t *count)
253{
254 *count = ARRAY_SIZE(pipe_crc_sources);
255 return pipe_crc_sources;
256}
257
258static int vkms_crc_parse_source(const char *src_name, bool *enabled)
259{
260 int ret = 0;
261
262 if (!src_name) {
263 *enabled = false;
264 } else if (strcmp(src_name, "auto") == 0) {
265 *enabled = true;
266 } else {
267 *enabled = false;
268 ret = -EINVAL;
269 }
270
271 return ret;
272}
273
274int vkms_verify_crc_source(struct drm_crtc *crtc, const char *src_name,
275 size_t *values_cnt)
276{
277 bool enabled;
278
279 if (vkms_crc_parse_source(src_name, &enabled) < 0) {
280 DRM_DEBUG_DRIVER("unknown source %s\n", src_name);
281 return -EINVAL;
282 }
283
284 *values_cnt = 1;
285
286 return 0;
287}
288
289void vkms_set_composer(struct vkms_output *out, bool enabled)
290{
291 bool old_enabled;
292
293 if (enabled)
294 drm_crtc_vblank_get(&out->crtc);
295
296 spin_lock_irq(&out->lock);
297 old_enabled = out->composer_enabled;
298 out->composer_enabled = enabled;
299 spin_unlock_irq(&out->lock);
300
301 if (old_enabled)
302 drm_crtc_vblank_put(&out->crtc);
303}
304
305int vkms_set_crc_source(struct drm_crtc *crtc, const char *src_name)
306{
307 struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
308 bool enabled = false;
309 int ret = 0;
310
311 ret = vkms_crc_parse_source(src_name, &enabled);
312
313 vkms_set_composer(out, enabled);
314
315 return ret;
316}
317