gpu/drm/drm_debugfs_crc.c

49  * file dri/0/crtc-N/crc/control in debugfs, with N being the :ref:`index of
55  * the dri/0/crtc-N/crc/data file. Each line in that file contains the frame
100 				if (strcmp(sources[i], crtc->crc.source))
109 	seq_printf(m, "%s*\n", crtc->crc.source);
125 	struct drm_crtc_crc *crc = &crtc->crc;
134 		DRM_DEBUG_KMS("Expected < %lu bytes into crtc crc control\n",
152 	spin_lock_irq(&crc->lock);
154 	if (crc->opened) {
155 		spin_unlock_irq(&crc->lock);
160 	kfree(crc->source);
161 	crc->source = source;
163 	spin_unlock_irq(&crc->lock);
178 static int crtc_crc_data_count(struct drm_crtc_crc *crc)
180 	assert_spin_locked(&crc->lock);
181 	return CIRC_CNT(crc->head, crc->tail, DRM_CRC_ENTRIES_NR);
184 static void crtc_crc_cleanup(struct drm_crtc_crc *crc)
186 	kfree(crc->entries);
187 	crc->overflow = false;
188 	crc->entries = NULL;
189 	crc->head = 0;
190 	crc->tail = 0;
191 	crc->values_cnt = 0;
192 	crc->opened = false;
198 	struct drm_crtc_crc *crc = &crtc->crc;
216 	ret = crtc->funcs->verify_crc_source(crtc, crc->source, &values_cnt);
230 	spin_lock_irq(&crc->lock);
231 	if (!crc->opened) {
232 		crc->opened = true;
233 		crc->entries = entries;
234 		crc->values_cnt = values_cnt;
238 	spin_unlock_irq(&crc->lock);
245 	ret = crtc->funcs->set_crc_source(crtc, crc->source);
252 	spin_lock_irq(&crc->lock);
253 	crtc_crc_cleanup(crc);
254 	spin_unlock_irq(&crc->lock);
261 	struct drm_crtc_crc *crc = &crtc->crc;
264 	spin_lock_irq(&crc->lock);
265 	crc->opened = false;
266 	spin_unlock_irq(&crc->lock);
270 	spin_lock_irq(&crc->lock);
271 	crtc_crc_cleanup(crc);
272 	spin_unlock_irq(&crc->lock);
288 	struct drm_crtc_crc *crc = &crtc->crc;
293 	spin_lock_irq(&crc->lock);
295 	if (!crc->source) {
296 		spin_unlock_irq(&crc->lock);
301 	while (crtc_crc_data_count(crc) == 0) {
303 			spin_unlock_irq(&crc->lock);
307 		ret = wait_event_interruptible_lock_irq(crc->wq,
308 							crtc_crc_data_count(crc),
309 							crc->lock);
311 			spin_unlock_irq(&crc->lock);
317 	entry = &crc->entries[crc->tail];
319 	if (count < LINE_LEN(crc->values_cnt)) {
320 		spin_unlock_irq(&crc->lock);
325 	crc->tail = (crc->tail + 1) & (DRM_CRC_ENTRIES_NR - 1);
327 	spin_unlock_irq(&crc->lock);
334 	for (i = 0; i < crc->values_cnt; i++)
336 	sprintf(buf + 10 + crc->values_cnt * 11, "\n");
338 	if (copy_to_user(user_buf, buf, LINE_LEN(crc->values_cnt)))
341 	return LINE_LEN(crc->values_cnt);
347 	struct drm_crtc_crc *crc = &crtc->crc;
350 	poll_wait(file, &crc->wq, wait);
352 	spin_lock_irq(&crc->lock);
353 	if (crc->source && crtc_crc_data_count(crc))
355 	spin_unlock_irq(&crc->lock);
375 	crc_ent = debugfs_create_dir("crc", crtc->debugfs_entry);
396 	struct drm_crtc_crc *crc = &crtc->crc;
401 	spin_lock_irqsave(&crc->lock, flags);
404 	if (!crc->entries) {
405 		spin_unlock_irqrestore(&crc->lock, flags);
409 	head = crc->head;
410 	tail = crc->tail;
413 		bool was_overflow = crc->overflow;
415 		crc->overflow = true;
416 		spin_unlock_irqrestore(&crc->lock, flags);
424 	entry = &crc->entries[head];
427 	memcpy(&entry->crcs, crcs, sizeof(*crcs) * crc->values_cnt);
430 	crc->head = head;
432 	spin_unlock_irqrestore(&crc->lock, flags);
434 	wake_up_interruptible(&crc->wq);