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Lines Matching defs:crc

48  * DOC: CRC ABI
50  * DRM device drivers can provide to userspace CRC information of each frame as
51  * it reached a given hardware component (a CRC sampling "source").
54  * file dri/0/crtc-N/crc/control in debugfs, with N being the index of the CRTC.
59  * Once frame CRC generation is enabled, userspace can capture them by reading
60  * the dri/0/crtc-N/crc/data file. Each line in that file contains the frame
62  * containing the CRC data. Fields are separated by a single space and the number
63  * of CRC fields is source-specific.
65  * Note that though in some cases the CRC is computed in a specified way and on
66  * the frame contents as supplied by userspace (eDP 1.3), in general the CRC
69  * rely on being able to generate matching CRC values for the frame contents that
75  * The debugfs files are automatically set up if those vfuncs are set. CRC samples
80  * CRC results must be reliable across non-full-modeset atomic commits, so if a
82  * CRC generation, then the driver must mark that commit as a full modeset
84  * consistent results, generic userspace must re-setup CRC generation after a
105 				if (strcmp(sources[i], crtc->crc.source))
114 	seq_printf(m, "%s*\n", crtc->crc.source);
130 	struct drm_crtc_crc *crc = &crtc->crc;
139 		DRM_DEBUG_KMS("Expected < %lu bytes into crtc crc control\n",
155 	spin_lock_irq(&crc->lock);
157 	if (crc->opened) {
158 		spin_unlock_irq(&crc->lock);
163 	kfree(crc->source);
164 	crc->source = source;
166 	spin_unlock_irq(&crc->lock);
181 static int crtc_crc_data_count(struct drm_crtc_crc *crc)
183 	assert_spin_locked(&crc->lock);
184 	return CIRC_CNT(crc->head, crc->tail, DRM_CRC_ENTRIES_NR);
187 static void crtc_crc_cleanup(struct drm_crtc_crc *crc)
189 	kfree(crc->entries);
190 	crc->overflow = false;
191 	crc->entries = NULL;
192 	crc->head = 0;
193 	crc->tail = 0;
194 	crc->values_cnt = 0;
195 	crc->opened = false;
201 	struct drm_crtc_crc *crc = &crtc->crc;
219 	ret = crtc->funcs->verify_crc_source(crtc, crc->source, &values_cnt);
233 	spin_lock_irq(&crc->lock);
234 	if (!crc->opened) {
235 		crc->opened = true;
236 		crc->entries = entries;
237 		crc->values_cnt = values_cnt;
241 	spin_unlock_irq(&crc->lock);
248 	ret = crtc->funcs->set_crc_source(crtc, crc->source);
255 	spin_lock_irq(&crc->lock);
256 	crtc_crc_cleanup(crc);
257 	spin_unlock_irq(&crc->lock);
264 	struct drm_crtc_crc *crc = &crtc->crc;
267 	spin_lock_irq(&crc->lock);
268 	crc->opened = false;
269 	spin_unlock_irq(&crc->lock);
273 	spin_lock_irq(&crc->lock);
274 	crtc_crc_cleanup(crc);
275 	spin_unlock_irq(&crc->lock);
281  * 1 frame field of 10 chars plus a number of CRC fields of 10 chars each, space
291 	struct drm_crtc_crc *crc = &crtc->crc;
296 	spin_lock_irq(&crc->lock);
298 	if (!crc->source) {
299 		spin_unlock_irq(&crc->lock);
304 	while (crtc_crc_data_count(crc) == 0) {
306 			spin_unlock_irq(&crc->lock);
310 		ret = wait_event_interruptible_lock_irq(crc->wq,
311 							crtc_crc_data_count(crc),
312 							crc->lock);
314 			spin_unlock_irq(&crc->lock);
320 	entry = &crc->entries[crc->tail];
322 	if (count < LINE_LEN(crc->values_cnt)) {
323 		spin_unlock_irq(&crc->lock);
328 	crc->tail = (crc->tail + 1) & (DRM_CRC_ENTRIES_NR - 1);
330 	spin_unlock_irq(&crc->lock);
337 	for (i = 0; i < crc->values_cnt; i++)
339 	sprintf(buf + 10 + crc->values_cnt * 11, "\n");
341 	if (copy_to_user(user_buf, buf, LINE_LEN(crc->values_cnt)))
344 	return LINE_LEN(crc->values_cnt);
350 	struct drm_crtc_crc *crc = &crtc->crc;
353 	poll_wait(file, &crc->wq, wait);
355 	spin_lock_irq(&crc->lock);
356 	if (crc->source && crtc_crc_data_count(crc))
358 	spin_unlock_irq(&crc->lock);
378 	crc_ent = debugfs_create_dir("crc", crtc->debugfs_entry);
387  * drm_crtc_add_crc_entry - Add entry with CRC information for a frame
391  * @crcs: array of CRC values, with length matching #drm_crtc_crc.values_cnt
399 	struct drm_crtc_crc *crc = &crtc->crc;
404 	spin_lock_irqsave(&crc->lock, flags);
407 	if (!crc->entries) {
408 		spin_unlock_irqrestore(&crc->lock, flags);
412 	head = crc->head;
413 	tail = crc->tail;
416 		bool was_overflow = crc->overflow;
418 		crc->overflow = true;
419 		spin_unlock_irqrestore(&crc->lock, flags);
422 			DRM_ERROR("Overflow of CRC buffer, userspace reads too slow.\n");
427 	entry = &crc->entries[head];
430 	memcpy(&entry->crcs, crcs, sizeof(*crcs) * crc->values_cnt);
433 	crc->head = head;
435 	spin_unlock_irqrestore(&crc->lock, flags);
437 	wake_up_interruptible(&crc->wq);