1 /*
2  * Copyright (C) 2014 Red Hat
3  * Copyright (C) 2014 Intel Corp.
4  * Copyright (C) 2018 Intel Corp.
5  * Copyright (c) 2020, The Linux Foundation. All rights reserved.
6  *
7  * Permission is hereby granted, free of charge, to any person obtaining a
8  * copy of this software and associated documentation files (the "Software"),
9  * to deal in the Software without restriction, including without limitation
10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11  * and/or sell copies of the Software, and to permit persons to whom the
12  * Software is furnished to do so, subject to the following conditions:
13  *
14  * The above copyright notice and this permission notice shall be included in
15  * all copies or substantial portions of the Software.
16  *
17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
20  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23  * OTHER DEALINGS IN THE SOFTWARE.
24  *
25  * Authors:
26  * Rob Clark <robdclark@gmail.com>
27  * Daniel Vetter <daniel.vetter@ffwll.ch>
28  */
29 
30 #include <drm/drm_atomic_uapi.h>
31 #include <drm/drm_atomic.h>
32 #include <drm/drm_framebuffer.h>
33 #include <drm/drm_print.h>
34 #include <drm/drm_drv.h>
35 #include <drm/drm_writeback.h>
36 #include <drm/drm_vblank.h>
37 
38 #include <linux/dma-fence.h>
39 #include <linux/uaccess.h>
40 #include <linux/sync_file.h>
41 #include <linux/file.h>
42 
43 #include "drm_crtc_internal.h"
44 
45 /**
46  * DOC: overview
47  *
48  * This file contains the marshalling and demarshalling glue for the atomic UAPI
49  * in all its forms: The monster ATOMIC IOCTL itself, code for GET_PROPERTY and
50  * SET_PROPERTY IOCTLs. Plus interface functions for compatibility helpers and
51  * drivers which have special needs to construct their own atomic updates, e.g.
52  * for load detect or similar.
53  */
54 
55 /**
56  * drm_atomic_set_mode_for_crtc - set mode for CRTC
57  * @state: the CRTC whose incoming state to update
58  * @mode: kernel-internal mode to use for the CRTC, or NULL to disable
59  *
60  * Set a mode (originating from the kernel) on the desired CRTC state and update
61  * the enable property.
62  *
63  * RETURNS:
64  * Zero on success, error code on failure. Cannot return -EDEADLK.
65  */
66 int drm_atomic_set_mode_for_crtc(struct drm_crtc_state *state,
67 				 const struct drm_display_mode *mode)
68 {
69 	struct drm_crtc *crtc = state->crtc;
70 	struct drm_mode_modeinfo umode;
71 
72 	/* Early return for no change. */
73 	if (mode && memcmp(&state->mode, mode, sizeof(*mode)) == 0)
74 		return 0;
75 
76 	drm_property_blob_put(state->mode_blob);
77 	state->mode_blob = NULL;
78 
79 	if (mode) {
80 		struct drm_property_blob *blob;
81 
82 		drm_mode_convert_to_umode(&umode, mode);
83 		blob = drm_property_create_blob(crtc->dev,
84 						sizeof(umode), &umode);
85 		if (IS_ERR(blob))
86 			return PTR_ERR(blob);
87 
88 		drm_mode_copy(&state->mode, mode);
89 
90 		state->mode_blob = blob;
91 		state->enable = true;
92 		drm_dbg_atomic(crtc->dev,
93 			       "Set [MODE:%s] for [CRTC:%d:%s] state %p\n",
94 			       mode->name, crtc->base.id, crtc->name, state);
95 	} else {
96 		memset(&state->mode, 0, sizeof(state->mode));
97 		state->enable = false;
98 		drm_dbg_atomic(crtc->dev,
99 			       "Set [NOMODE] for [CRTC:%d:%s] state %p\n",
100 			       crtc->base.id, crtc->name, state);
101 	}
102 
103 	return 0;
104 }
105 EXPORT_SYMBOL(drm_atomic_set_mode_for_crtc);
106 
107 /**
108  * drm_atomic_set_mode_prop_for_crtc - set mode for CRTC
109  * @state: the CRTC whose incoming state to update
110  * @blob: pointer to blob property to use for mode
111  *
112  * Set a mode (originating from a blob property) on the desired CRTC state.
113  * This function will take a reference on the blob property for the CRTC state,
114  * and release the reference held on the state's existing mode property, if any
115  * was set.
116  *
117  * RETURNS:
118  * Zero on success, error code on failure. Cannot return -EDEADLK.
119  */
120 int drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state *state,
121 				      struct drm_property_blob *blob)
122 {
123 	struct drm_crtc *crtc = state->crtc;
124 
125 	if (blob == state->mode_blob)
126 		return 0;
127 
128 	drm_property_blob_put(state->mode_blob);
129 	state->mode_blob = NULL;
130 
131 	memset(&state->mode, 0, sizeof(state->mode));
132 
133 	if (blob) {
134 		int ret;
135 
136 		if (blob->length != sizeof(struct drm_mode_modeinfo)) {
137 			drm_dbg_atomic(crtc->dev,
138 				       "[CRTC:%d:%s] bad mode blob length: %zu\n",
139 				       crtc->base.id, crtc->name,
140 				       blob->length);
141 			return -EINVAL;
142 		}
143 
144 		ret = drm_mode_convert_umode(crtc->dev,
145 					     &state->mode, blob->data);
146 		if (ret) {
147 			drm_dbg_atomic(crtc->dev,
148 				       "[CRTC:%d:%s] invalid mode (ret=%d, status=%s):\n",
149 				       crtc->base.id, crtc->name,
150 				       ret, drm_get_mode_status_name(state->mode.status));
151 			drm_mode_debug_printmodeline(&state->mode);
152 			return -EINVAL;
153 		}
154 
155 		state->mode_blob = drm_property_blob_get(blob);
156 		state->enable = true;
157 		drm_dbg_atomic(crtc->dev,
158 			       "Set [MODE:%s] for [CRTC:%d:%s] state %p\n",
159 			       state->mode.name, crtc->base.id, crtc->name,
160 			       state);
161 	} else {
162 		state->enable = false;
163 		drm_dbg_atomic(crtc->dev,
164 			       "Set [NOMODE] for [CRTC:%d:%s] state %p\n",
165 			       crtc->base.id, crtc->name, state);
166 	}
167 
168 	return 0;
169 }
170 EXPORT_SYMBOL(drm_atomic_set_mode_prop_for_crtc);
171 
172 /**
173  * drm_atomic_set_crtc_for_plane - set CRTC for plane
174  * @plane_state: the plane whose incoming state to update
175  * @crtc: CRTC to use for the plane
176  *
177  * Changing the assigned CRTC for a plane requires us to grab the lock and state
178  * for the new CRTC, as needed. This function takes care of all these details
179  * besides updating the pointer in the state object itself.
180  *
181  * Returns:
182  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
183  * then the w/w mutex code has detected a deadlock and the entire atomic
184  * sequence must be restarted. All other errors are fatal.
185  */
186 int
187 drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state,
188 			      struct drm_crtc *crtc)
189 {
190 	struct drm_plane *plane = plane_state->plane;
191 	struct drm_crtc_state *crtc_state;
192 	/* Nothing to do for same crtc*/
193 	if (plane_state->crtc == crtc)
194 		return 0;
195 	if (plane_state->crtc) {
196 		crtc_state = drm_atomic_get_crtc_state(plane_state->state,
197 						       plane_state->crtc);
198 		if (WARN_ON(IS_ERR(crtc_state)))
199 			return PTR_ERR(crtc_state);
200 
201 		crtc_state->plane_mask &= ~drm_plane_mask(plane);
202 	}
203 
204 	plane_state->crtc = crtc;
205 
206 	if (crtc) {
207 		crtc_state = drm_atomic_get_crtc_state(plane_state->state,
208 						       crtc);
209 		if (IS_ERR(crtc_state))
210 			return PTR_ERR(crtc_state);
211 		crtc_state->plane_mask |= drm_plane_mask(plane);
212 	}
213 
214 	if (crtc)
215 		drm_dbg_atomic(plane->dev,
216 			       "Link [PLANE:%d:%s] state %p to [CRTC:%d:%s]\n",
217 			       plane->base.id, plane->name, plane_state,
218 			       crtc->base.id, crtc->name);
219 	else
220 		drm_dbg_atomic(plane->dev,
221 			       "Link [PLANE:%d:%s] state %p to [NOCRTC]\n",
222 			       plane->base.id, plane->name, plane_state);
223 
224 	return 0;
225 }
226 EXPORT_SYMBOL(drm_atomic_set_crtc_for_plane);
227 
228 /**
229  * drm_atomic_set_fb_for_plane - set framebuffer for plane
230  * @plane_state: atomic state object for the plane
231  * @fb: fb to use for the plane
232  *
233  * Changing the assigned framebuffer for a plane requires us to grab a reference
234  * to the new fb and drop the reference to the old fb, if there is one. This
235  * function takes care of all these details besides updating the pointer in the
236  * state object itself.
237  */
238 void
239 drm_atomic_set_fb_for_plane(struct drm_plane_state *plane_state,
240 			    struct drm_framebuffer *fb)
241 {
242 	struct drm_plane *plane = plane_state->plane;
243 
244 	if (fb)
245 		drm_dbg_atomic(plane->dev,
246 			       "Set [FB:%d] for [PLANE:%d:%s] state %p\n",
247 			       fb->base.id, plane->base.id, plane->name,
248 			       plane_state);
249 	else
250 		drm_dbg_atomic(plane->dev,
251 			       "Set [NOFB] for [PLANE:%d:%s] state %p\n",
252 			       plane->base.id, plane->name, plane_state);
253 
254 	drm_framebuffer_assign(&plane_state->fb, fb);
255 }
256 EXPORT_SYMBOL(drm_atomic_set_fb_for_plane);
257 
258 /**
259  * drm_atomic_set_crtc_for_connector - set CRTC for connector
260  * @conn_state: atomic state object for the connector
261  * @crtc: CRTC to use for the connector
262  *
263  * Changing the assigned CRTC for a connector requires us to grab the lock and
264  * state for the new CRTC, as needed. This function takes care of all these
265  * details besides updating the pointer in the state object itself.
266  *
267  * Returns:
268  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
269  * then the w/w mutex code has detected a deadlock and the entire atomic
270  * sequence must be restarted. All other errors are fatal.
271  */
272 int
273 drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
274 				  struct drm_crtc *crtc)
275 {
276 	struct drm_connector *connector = conn_state->connector;
277 	struct drm_crtc_state *crtc_state;
278 
279 	if (conn_state->crtc == crtc)
280 		return 0;
281 
282 	if (conn_state->crtc) {
283 		crtc_state = drm_atomic_get_new_crtc_state(conn_state->state,
284 							   conn_state->crtc);
285 
286 		crtc_state->connector_mask &=
287 			~drm_connector_mask(conn_state->connector);
288 
289 		drm_connector_put(conn_state->connector);
290 		conn_state->crtc = NULL;
291 	}
292 
293 	if (crtc) {
294 		crtc_state = drm_atomic_get_crtc_state(conn_state->state, crtc);
295 		if (IS_ERR(crtc_state))
296 			return PTR_ERR(crtc_state);
297 
298 		crtc_state->connector_mask |=
299 			drm_connector_mask(conn_state->connector);
300 
301 		drm_connector_get(conn_state->connector);
302 		conn_state->crtc = crtc;
303 
304 		drm_dbg_atomic(connector->dev,
305 			       "Link [CONNECTOR:%d:%s] state %p to [CRTC:%d:%s]\n",
306 			       connector->base.id, connector->name,
307 			       conn_state, crtc->base.id, crtc->name);
308 	} else {
309 		drm_dbg_atomic(connector->dev,
310 			       "Link [CONNECTOR:%d:%s] state %p to [NOCRTC]\n",
311 			       connector->base.id, connector->name,
312 			       conn_state);
313 	}
314 
315 	return 0;
316 }
317 EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector);
318 
319 static void set_out_fence_for_crtc(struct drm_atomic_state *state,
320 				   struct drm_crtc *crtc, s32 __user *fence_ptr)
321 {
322 	state->crtcs[drm_crtc_index(crtc)].out_fence_ptr = fence_ptr;
323 }
324 
325 static s32 __user *get_out_fence_for_crtc(struct drm_atomic_state *state,
326 					  struct drm_crtc *crtc)
327 {
328 	s32 __user *fence_ptr;
329 
330 	fence_ptr = state->crtcs[drm_crtc_index(crtc)].out_fence_ptr;
331 	state->crtcs[drm_crtc_index(crtc)].out_fence_ptr = NULL;
332 
333 	return fence_ptr;
334 }
335 
336 static int set_out_fence_for_connector(struct drm_atomic_state *state,
337 					struct drm_connector *connector,
338 					s32 __user *fence_ptr)
339 {
340 	unsigned int index = drm_connector_index(connector);
341 
342 	if (!fence_ptr)
343 		return 0;
344 
345 	if (put_user(-1, fence_ptr))
346 		return -EFAULT;
347 
348 	state->connectors[index].out_fence_ptr = fence_ptr;
349 
350 	return 0;
351 }
352 
353 static s32 __user *get_out_fence_for_connector(struct drm_atomic_state *state,
354 					       struct drm_connector *connector)
355 {
356 	unsigned int index = drm_connector_index(connector);
357 	s32 __user *fence_ptr;
358 
359 	fence_ptr = state->connectors[index].out_fence_ptr;
360 	state->connectors[index].out_fence_ptr = NULL;
361 
362 	return fence_ptr;
363 }
364 
365 static int
366 drm_atomic_replace_property_blob_from_id(struct drm_device *dev,
367 					 struct drm_property_blob **blob,
368 					 uint64_t blob_id,
369 					 ssize_t expected_size,
370 					 ssize_t expected_elem_size,
371 					 bool *replaced)
372 {
373 	struct drm_property_blob *new_blob = NULL;
374 
375 	if (blob_id != 0) {
376 		new_blob = drm_property_lookup_blob(dev, blob_id);
377 		if (new_blob == NULL)
378 			return -EINVAL;
379 
380 		if (expected_size > 0 &&
381 		    new_blob->length != expected_size) {
382 			drm_property_blob_put(new_blob);
383 			return -EINVAL;
384 		}
385 		if (expected_elem_size > 0 &&
386 		    new_blob->length % expected_elem_size != 0) {
387 			drm_property_blob_put(new_blob);
388 			return -EINVAL;
389 		}
390 	}
391 
392 	*replaced |= drm_property_replace_blob(blob, new_blob);
393 	drm_property_blob_put(new_blob);
394 
395 	return 0;
396 }
397 
398 static int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
399 		struct drm_crtc_state *state, struct drm_property *property,
400 		uint64_t val)
401 {
402 	struct drm_device *dev = crtc->dev;
403 	struct drm_mode_config *config = &dev->mode_config;
404 	bool replaced = false;
405 	int ret;
406 
407 	if (property == config->prop_active)
408 		state->active = val;
409 	else if (property == config->prop_mode_id) {
410 		struct drm_property_blob *mode =
411 			drm_property_lookup_blob(dev, val);
412 		ret = drm_atomic_set_mode_prop_for_crtc(state, mode);
413 		drm_property_blob_put(mode);
414 		return ret;
415 	} else if (property == config->prop_vrr_enabled) {
416 		state->vrr_enabled = val;
417 	} else if (property == config->degamma_lut_property) {
418 		ret = drm_atomic_replace_property_blob_from_id(dev,
419 					&state->degamma_lut,
420 					val,
421 					-1, sizeof(struct drm_color_lut),
422 					&replaced);
423 		state->color_mgmt_changed |= replaced;
424 		return ret;
425 	} else if (property == config->ctm_property) {
426 		ret = drm_atomic_replace_property_blob_from_id(dev,
427 					&state->ctm,
428 					val,
429 					sizeof(struct drm_color_ctm), -1,
430 					&replaced);
431 		state->color_mgmt_changed |= replaced;
432 		return ret;
433 	} else if (property == config->gamma_lut_property) {
434 		ret = drm_atomic_replace_property_blob_from_id(dev,
435 					&state->gamma_lut,
436 					val,
437 					-1, sizeof(struct drm_color_lut),
438 					&replaced);
439 		state->color_mgmt_changed |= replaced;
440 		return ret;
441 	} else if (property == config->prop_out_fence_ptr) {
442 		s32 __user *fence_ptr = u64_to_user_ptr(val);
443 
444 		if (!fence_ptr)
445 			return 0;
446 
447 		if (put_user(-1, fence_ptr))
448 			return -EFAULT;
449 
450 		set_out_fence_for_crtc(state->state, crtc, fence_ptr);
451 	} else if (property == crtc->scaling_filter_property) {
452 		state->scaling_filter = val;
453 	} else if (crtc->funcs->atomic_set_property) {
454 		return crtc->funcs->atomic_set_property(crtc, state, property, val);
455 	} else {
456 		drm_dbg_atomic(crtc->dev,
457 			       "[CRTC:%d:%s] unknown property [PROP:%d:%s]]\n",
458 			       crtc->base.id, crtc->name,
459 			       property->base.id, property->name);
460 		return -EINVAL;
461 	}
462 
463 	return 0;
464 }
465 
466 static int
467 drm_atomic_crtc_get_property(struct drm_crtc *crtc,
468 		const struct drm_crtc_state *state,
469 		struct drm_property *property, uint64_t *val)
470 {
471 	struct drm_device *dev = crtc->dev;
472 	struct drm_mode_config *config = &dev->mode_config;
473 
474 	if (property == config->prop_active)
475 		*val = drm_atomic_crtc_effectively_active(state);
476 	else if (property == config->prop_mode_id)
477 		*val = (state->mode_blob) ? state->mode_blob->base.id : 0;
478 	else if (property == config->prop_vrr_enabled)
479 		*val = state->vrr_enabled;
480 	else if (property == config->degamma_lut_property)
481 		*val = (state->degamma_lut) ? state->degamma_lut->base.id : 0;
482 	else if (property == config->ctm_property)
483 		*val = (state->ctm) ? state->ctm->base.id : 0;
484 	else if (property == config->gamma_lut_property)
485 		*val = (state->gamma_lut) ? state->gamma_lut->base.id : 0;
486 	else if (property == config->prop_out_fence_ptr)
487 		*val = 0;
488 	else if (property == crtc->scaling_filter_property)
489 		*val = state->scaling_filter;
490 	else if (crtc->funcs->atomic_get_property)
491 		return crtc->funcs->atomic_get_property(crtc, state, property, val);
492 	else
493 		return -EINVAL;
494 
495 	return 0;
496 }
497 
498 static int drm_atomic_plane_set_property(struct drm_plane *plane,
499 		struct drm_plane_state *state, struct drm_file *file_priv,
500 		struct drm_property *property, uint64_t val)
501 {
502 	struct drm_device *dev = plane->dev;
503 	struct drm_mode_config *config = &dev->mode_config;
504 	bool replaced = false;
505 	int ret;
506 
507 	if (property == config->prop_fb_id) {
508 		struct drm_framebuffer *fb;
509 
510 		fb = drm_framebuffer_lookup(dev, file_priv, val);
511 		drm_atomic_set_fb_for_plane(state, fb);
512 		if (fb)
513 			drm_framebuffer_put(fb);
514 	} else if (property == config->prop_in_fence_fd) {
515 		if (state->fence)
516 			return -EINVAL;
517 
518 		if (U642I64(val) == -1)
519 			return 0;
520 
521 		state->fence = sync_file_get_fence(val);
522 		if (!state->fence)
523 			return -EINVAL;
524 
525 	} else if (property == config->prop_crtc_id) {
526 		struct drm_crtc *crtc = drm_crtc_find(dev, file_priv, val);
527 
528 		if (val && !crtc)
529 			return -EACCES;
530 		return drm_atomic_set_crtc_for_plane(state, crtc);
531 	} else if (property == config->prop_crtc_x) {
532 		state->crtc_x = U642I64(val);
533 	} else if (property == config->prop_crtc_y) {
534 		state->crtc_y = U642I64(val);
535 	} else if (property == config->prop_crtc_w) {
536 		state->crtc_w = val;
537 	} else if (property == config->prop_crtc_h) {
538 		state->crtc_h = val;
539 	} else if (property == config->prop_src_x) {
540 		state->src_x = val;
541 	} else if (property == config->prop_src_y) {
542 		state->src_y = val;
543 	} else if (property == config->prop_src_w) {
544 		state->src_w = val;
545 	} else if (property == config->prop_src_h) {
546 		state->src_h = val;
547 	} else if (property == plane->alpha_property) {
548 		state->alpha = val;
549 	} else if (property == plane->blend_mode_property) {
550 		state->pixel_blend_mode = val;
551 	} else if (property == plane->rotation_property) {
552 		if (!is_power_of_2(val & DRM_MODE_ROTATE_MASK)) {
553 			drm_dbg_atomic(plane->dev,
554 				       "[PLANE:%d:%s] bad rotation bitmask: 0x%llx\n",
555 				       plane->base.id, plane->name, val);
556 			return -EINVAL;
557 		}
558 		state->rotation = val;
559 	} else if (property == plane->zpos_property) {
560 		state->zpos = val;
561 	} else if (property == plane->color_encoding_property) {
562 		state->color_encoding = val;
563 	} else if (property == plane->color_range_property) {
564 		state->color_range = val;
565 	} else if (property == config->prop_fb_damage_clips) {
566 		ret = drm_atomic_replace_property_blob_from_id(dev,
567 					&state->fb_damage_clips,
568 					val,
569 					-1,
570 					sizeof(struct drm_rect),
571 					&replaced);
572 		return ret;
573 	} else if (property == plane->scaling_filter_property) {
574 		state->scaling_filter = val;
575 	} else if (plane->funcs->atomic_set_property) {
576 		return plane->funcs->atomic_set_property(plane, state,
577 				property, val);
578 	} else {
579 		drm_dbg_atomic(plane->dev,
580 			       "[PLANE:%d:%s] unknown property [PROP:%d:%s]]\n",
581 			       plane->base.id, plane->name,
582 			       property->base.id, property->name);
583 		return -EINVAL;
584 	}
585 
586 	return 0;
587 }
588 
589 static int
590 drm_atomic_plane_get_property(struct drm_plane *plane,
591 		const struct drm_plane_state *state,
592 		struct drm_property *property, uint64_t *val)
593 {
594 	struct drm_device *dev = plane->dev;
595 	struct drm_mode_config *config = &dev->mode_config;
596 
597 	if (property == config->prop_fb_id) {
598 		*val = (state->fb) ? state->fb->base.id : 0;
599 	} else if (property == config->prop_in_fence_fd) {
600 		*val = -1;
601 	} else if (property == config->prop_crtc_id) {
602 		*val = (state->crtc) ? state->crtc->base.id : 0;
603 	} else if (property == config->prop_crtc_x) {
604 		*val = I642U64(state->crtc_x);
605 	} else if (property == config->prop_crtc_y) {
606 		*val = I642U64(state->crtc_y);
607 	} else if (property == config->prop_crtc_w) {
608 		*val = state->crtc_w;
609 	} else if (property == config->prop_crtc_h) {
610 		*val = state->crtc_h;
611 	} else if (property == config->prop_src_x) {
612 		*val = state->src_x;
613 	} else if (property == config->prop_src_y) {
614 		*val = state->src_y;
615 	} else if (property == config->prop_src_w) {
616 		*val = state->src_w;
617 	} else if (property == config->prop_src_h) {
618 		*val = state->src_h;
619 	} else if (property == plane->alpha_property) {
620 		*val = state->alpha;
621 	} else if (property == plane->blend_mode_property) {
622 		*val = state->pixel_blend_mode;
623 	} else if (property == plane->rotation_property) {
624 		*val = state->rotation;
625 	} else if (property == plane->zpos_property) {
626 		*val = state->zpos;
627 	} else if (property == plane->color_encoding_property) {
628 		*val = state->color_encoding;
629 	} else if (property == plane->color_range_property) {
630 		*val = state->color_range;
631 	} else if (property == config->prop_fb_damage_clips) {
632 		*val = (state->fb_damage_clips) ?
633 			state->fb_damage_clips->base.id : 0;
634 	} else if (property == plane->scaling_filter_property) {
635 		*val = state->scaling_filter;
636 	} else if (plane->funcs->atomic_get_property) {
637 		return plane->funcs->atomic_get_property(plane, state, property, val);
638 	} else {
639 		return -EINVAL;
640 	}
641 
642 	return 0;
643 }
644 
645 static int drm_atomic_set_writeback_fb_for_connector(
646 		struct drm_connector_state *conn_state,
647 		struct drm_framebuffer *fb)
648 {
649 	int ret;
650 	struct drm_connector *conn = conn_state->connector;
651 
652 	ret = drm_writeback_set_fb(conn_state, fb);
653 	if (ret < 0)
654 		return ret;
655 
656 	if (fb)
657 		drm_dbg_atomic(conn->dev,
658 			       "Set [FB:%d] for connector state %p\n",
659 			       fb->base.id, conn_state);
660 	else
661 		drm_dbg_atomic(conn->dev,
662 			       "Set [NOFB] for connector state %p\n",
663 			       conn_state);
664 
665 	return 0;
666 }
667 
668 static int drm_atomic_connector_set_property(struct drm_connector *connector,
669 		struct drm_connector_state *state, struct drm_file *file_priv,
670 		struct drm_property *property, uint64_t val)
671 {
672 	struct drm_device *dev = connector->dev;
673 	struct drm_mode_config *config = &dev->mode_config;
674 	bool replaced = false;
675 	int ret;
676 
677 	if (property == config->prop_crtc_id) {
678 		struct drm_crtc *crtc = drm_crtc_find(dev, file_priv, val);
679 
680 		if (val && !crtc)
681 			return -EACCES;
682 		return drm_atomic_set_crtc_for_connector(state, crtc);
683 	} else if (property == config->dpms_property) {
684 		/* setting DPMS property requires special handling, which
685 		 * is done in legacy setprop path for us.  Disallow (for
686 		 * now?) atomic writes to DPMS property:
687 		 */
688 		return -EINVAL;
689 	} else if (property == config->tv_select_subconnector_property) {
690 		state->tv.subconnector = val;
691 	} else if (property == config->tv_left_margin_property) {
692 		state->tv.margins.left = val;
693 	} else if (property == config->tv_right_margin_property) {
694 		state->tv.margins.right = val;
695 	} else if (property == config->tv_top_margin_property) {
696 		state->tv.margins.top = val;
697 	} else if (property == config->tv_bottom_margin_property) {
698 		state->tv.margins.bottom = val;
699 	} else if (property == config->tv_mode_property) {
700 		state->tv.mode = val;
701 	} else if (property == config->tv_brightness_property) {
702 		state->tv.brightness = val;
703 	} else if (property == config->tv_contrast_property) {
704 		state->tv.contrast = val;
705 	} else if (property == config->tv_flicker_reduction_property) {
706 		state->tv.flicker_reduction = val;
707 	} else if (property == config->tv_overscan_property) {
708 		state->tv.overscan = val;
709 	} else if (property == config->tv_saturation_property) {
710 		state->tv.saturation = val;
711 	} else if (property == config->tv_hue_property) {
712 		state->tv.hue = val;
713 	} else if (property == config->link_status_property) {
714 		/* Never downgrade from GOOD to BAD on userspace's request here,
715 		 * only hw issues can do that.
716 		 *
717 		 * For an atomic property the userspace doesn't need to be able
718 		 * to understand all the properties, but needs to be able to
719 		 * restore the state it wants on VT switch. So if the userspace
720 		 * tries to change the link_status from GOOD to BAD, driver
721 		 * silently rejects it and returns a 0. This prevents userspace
722 		 * from accidentally breaking  the display when it restores the
723 		 * state.
724 		 */
725 		if (state->link_status != DRM_LINK_STATUS_GOOD)
726 			state->link_status = val;
727 	} else if (property == config->hdr_output_metadata_property) {
728 		ret = drm_atomic_replace_property_blob_from_id(dev,
729 				&state->hdr_output_metadata,
730 				val,
731 				sizeof(struct hdr_output_metadata), -1,
732 				&replaced);
733 		return ret;
734 	} else if (property == config->aspect_ratio_property) {
735 		state->picture_aspect_ratio = val;
736 	} else if (property == config->content_type_property) {
737 		state->content_type = val;
738 	} else if (property == connector->scaling_mode_property) {
739 		state->scaling_mode = val;
740 	} else if (property == config->content_protection_property) {
741 		if (val == DRM_MODE_CONTENT_PROTECTION_ENABLED) {
742 			drm_dbg_kms(dev, "only drivers can set CP Enabled\n");
743 			return -EINVAL;
744 		}
745 		state->content_protection = val;
746 	} else if (property == config->hdcp_content_type_property) {
747 		state->hdcp_content_type = val;
748 	} else if (property == connector->colorspace_property) {
749 		state->colorspace = val;
750 	} else if (property == config->writeback_fb_id_property) {
751 		struct drm_framebuffer *fb;
752 		int ret;
753 
754 		fb = drm_framebuffer_lookup(dev, file_priv, val);
755 		ret = drm_atomic_set_writeback_fb_for_connector(state, fb);
756 		if (fb)
757 			drm_framebuffer_put(fb);
758 		return ret;
759 	} else if (property == config->writeback_out_fence_ptr_property) {
760 		s32 __user *fence_ptr = u64_to_user_ptr(val);
761 
762 		return set_out_fence_for_connector(state->state, connector,
763 						   fence_ptr);
764 	} else if (property == connector->max_bpc_property) {
765 		state->max_requested_bpc = val;
766 	} else if (property == connector->privacy_screen_sw_state_property) {
767 		state->privacy_screen_sw_state = val;
768 	} else if (connector->funcs->atomic_set_property) {
769 		return connector->funcs->atomic_set_property(connector,
770 				state, property, val);
771 	} else {
772 		drm_dbg_atomic(connector->dev,
773 			       "[CONNECTOR:%d:%s] unknown property [PROP:%d:%s]]\n",
774 			       connector->base.id, connector->name,
775 			       property->base.id, property->name);
776 		return -EINVAL;
777 	}
778 
779 	return 0;
780 }
781 
782 static int
783 drm_atomic_connector_get_property(struct drm_connector *connector,
784 		const struct drm_connector_state *state,
785 		struct drm_property *property, uint64_t *val)
786 {
787 	struct drm_device *dev = connector->dev;
788 	struct drm_mode_config *config = &dev->mode_config;
789 
790 	if (property == config->prop_crtc_id) {
791 		*val = (state->crtc) ? state->crtc->base.id : 0;
792 	} else if (property == config->dpms_property) {
793 		if (state->crtc && state->crtc->state->self_refresh_active)
794 			*val = DRM_MODE_DPMS_ON;
795 		else
796 			*val = connector->dpms;
797 	} else if (property == config->tv_select_subconnector_property) {
798 		*val = state->tv.subconnector;
799 	} else if (property == config->tv_left_margin_property) {
800 		*val = state->tv.margins.left;
801 	} else if (property == config->tv_right_margin_property) {
802 		*val = state->tv.margins.right;
803 	} else if (property == config->tv_top_margin_property) {
804 		*val = state->tv.margins.top;
805 	} else if (property == config->tv_bottom_margin_property) {
806 		*val = state->tv.margins.bottom;
807 	} else if (property == config->tv_mode_property) {
808 		*val = state->tv.mode;
809 	} else if (property == config->tv_brightness_property) {
810 		*val = state->tv.brightness;
811 	} else if (property == config->tv_contrast_property) {
812 		*val = state->tv.contrast;
813 	} else if (property == config->tv_flicker_reduction_property) {
814 		*val = state->tv.flicker_reduction;
815 	} else if (property == config->tv_overscan_property) {
816 		*val = state->tv.overscan;
817 	} else if (property == config->tv_saturation_property) {
818 		*val = state->tv.saturation;
819 	} else if (property == config->tv_hue_property) {
820 		*val = state->tv.hue;
821 	} else if (property == config->link_status_property) {
822 		*val = state->link_status;
823 	} else if (property == config->aspect_ratio_property) {
824 		*val = state->picture_aspect_ratio;
825 	} else if (property == config->content_type_property) {
826 		*val = state->content_type;
827 	} else if (property == connector->colorspace_property) {
828 		*val = state->colorspace;
829 	} else if (property == connector->scaling_mode_property) {
830 		*val = state->scaling_mode;
831 	} else if (property == config->hdr_output_metadata_property) {
832 		*val = state->hdr_output_metadata ?
833 			state->hdr_output_metadata->base.id : 0;
834 	} else if (property == config->content_protection_property) {
835 		*val = state->content_protection;
836 	} else if (property == config->hdcp_content_type_property) {
837 		*val = state->hdcp_content_type;
838 	} else if (property == config->writeback_fb_id_property) {
839 		/* Writeback framebuffer is one-shot, write and forget */
840 		*val = 0;
841 	} else if (property == config->writeback_out_fence_ptr_property) {
842 		*val = 0;
843 	} else if (property == connector->max_bpc_property) {
844 		*val = state->max_requested_bpc;
845 	} else if (property == connector->privacy_screen_sw_state_property) {
846 		*val = state->privacy_screen_sw_state;
847 	} else if (connector->funcs->atomic_get_property) {
848 		return connector->funcs->atomic_get_property(connector,
849 				state, property, val);
850 	} else {
851 		return -EINVAL;
852 	}
853 
854 	return 0;
855 }
856 
857 int drm_atomic_get_property(struct drm_mode_object *obj,
858 		struct drm_property *property, uint64_t *val)
859 {
860 	struct drm_device *dev = property->dev;
861 	int ret;
862 
863 	switch (obj->type) {
864 	case DRM_MODE_OBJECT_CONNECTOR: {
865 		struct drm_connector *connector = obj_to_connector(obj);
866 
867 		WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
868 		ret = drm_atomic_connector_get_property(connector,
869 				connector->state, property, val);
870 		break;
871 	}
872 	case DRM_MODE_OBJECT_CRTC: {
873 		struct drm_crtc *crtc = obj_to_crtc(obj);
874 
875 		WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
876 		ret = drm_atomic_crtc_get_property(crtc,
877 				crtc->state, property, val);
878 		break;
879 	}
880 	case DRM_MODE_OBJECT_PLANE: {
881 		struct drm_plane *plane = obj_to_plane(obj);
882 
883 		WARN_ON(!drm_modeset_is_locked(&plane->mutex));
884 		ret = drm_atomic_plane_get_property(plane,
885 				plane->state, property, val);
886 		break;
887 	}
888 	default:
889 		ret = -EINVAL;
890 		break;
891 	}
892 
893 	return ret;
894 }
895 
896 /*
897  * The big monster ioctl
898  */
899 
900 static struct drm_pending_vblank_event *create_vblank_event(
901 		struct drm_crtc *crtc, uint64_t user_data)
902 {
903 	struct drm_pending_vblank_event *e = NULL;
904 
905 	e = kzalloc(sizeof *e, GFP_KERNEL);
906 	if (!e)
907 		return NULL;
908 
909 	e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
910 	e->event.base.length = sizeof(e->event);
911 	e->event.vbl.crtc_id = crtc->base.id;
912 	e->event.vbl.user_data = user_data;
913 
914 	return e;
915 }
916 
917 int drm_atomic_connector_commit_dpms(struct drm_atomic_state *state,
918 				     struct drm_connector *connector,
919 				     int mode)
920 {
921 	struct drm_connector *tmp_connector;
922 	struct drm_connector_state *new_conn_state;
923 	struct drm_crtc *crtc;
924 	struct drm_crtc_state *crtc_state;
925 	int i, ret, old_mode = connector->dpms;
926 	bool active = false;
927 
928 	ret = drm_modeset_lock(&state->dev->mode_config.connection_mutex,
929 			       state->acquire_ctx);
930 	if (ret)
931 		return ret;
932 
933 	if (mode != DRM_MODE_DPMS_ON)
934 		mode = DRM_MODE_DPMS_OFF;
935 	connector->dpms = mode;
936 
937 	crtc = connector->state->crtc;
938 	if (!crtc)
939 		goto out;
940 	ret = drm_atomic_add_affected_connectors(state, crtc);
941 	if (ret)
942 		goto out;
943 
944 	crtc_state = drm_atomic_get_crtc_state(state, crtc);
945 	if (IS_ERR(crtc_state)) {
946 		ret = PTR_ERR(crtc_state);
947 		goto out;
948 	}
949 
950 	for_each_new_connector_in_state(state, tmp_connector, new_conn_state, i) {
951 		if (new_conn_state->crtc != crtc)
952 			continue;
953 		if (tmp_connector->dpms == DRM_MODE_DPMS_ON) {
954 			active = true;
955 			break;
956 		}
957 	}
958 
959 	crtc_state->active = active;
960 	ret = drm_atomic_commit(state);
961 out:
962 	if (ret != 0)
963 		connector->dpms = old_mode;
964 	return ret;
965 }
966 
967 int drm_atomic_set_property(struct drm_atomic_state *state,
968 			    struct drm_file *file_priv,
969 			    struct drm_mode_object *obj,
970 			    struct drm_property *prop,
971 			    uint64_t prop_value)
972 {
973 	struct drm_mode_object *ref;
974 	int ret;
975 
976 	if (!drm_property_change_valid_get(prop, prop_value, &ref))
977 		return -EINVAL;
978 
979 	switch (obj->type) {
980 	case DRM_MODE_OBJECT_CONNECTOR: {
981 		struct drm_connector *connector = obj_to_connector(obj);
982 		struct drm_connector_state *connector_state;
983 
984 		connector_state = drm_atomic_get_connector_state(state, connector);
985 		if (IS_ERR(connector_state)) {
986 			ret = PTR_ERR(connector_state);
987 			break;
988 		}
989 
990 		ret = drm_atomic_connector_set_property(connector,
991 				connector_state, file_priv,
992 				prop, prop_value);
993 		break;
994 	}
995 	case DRM_MODE_OBJECT_CRTC: {
996 		struct drm_crtc *crtc = obj_to_crtc(obj);
997 		struct drm_crtc_state *crtc_state;
998 
999 		crtc_state = drm_atomic_get_crtc_state(state, crtc);
1000 		if (IS_ERR(crtc_state)) {
1001 			ret = PTR_ERR(crtc_state);
1002 			break;
1003 		}
1004 
1005 		ret = drm_atomic_crtc_set_property(crtc,
1006 				crtc_state, prop, prop_value);
1007 		break;
1008 	}
1009 	case DRM_MODE_OBJECT_PLANE: {
1010 		struct drm_plane *plane = obj_to_plane(obj);
1011 		struct drm_plane_state *plane_state;
1012 
1013 		plane_state = drm_atomic_get_plane_state(state, plane);
1014 		if (IS_ERR(plane_state)) {
1015 			ret = PTR_ERR(plane_state);
1016 			break;
1017 		}
1018 
1019 		ret = drm_atomic_plane_set_property(plane,
1020 				plane_state, file_priv,
1021 				prop, prop_value);
1022 		break;
1023 	}
1024 	default:
1025 		ret = -EINVAL;
1026 		break;
1027 	}
1028 
1029 	drm_property_change_valid_put(prop, ref);
1030 	return ret;
1031 }
1032 
1033 /**
1034  * DOC: explicit fencing properties
1035  *
1036  * Explicit fencing allows userspace to control the buffer synchronization
1037  * between devices. A Fence or a group of fences are transferred to/from
1038  * userspace using Sync File fds and there are two DRM properties for that.
1039  * IN_FENCE_FD on each DRM Plane to send fences to the kernel and
1040  * OUT_FENCE_PTR on each DRM CRTC to receive fences from the kernel.
1041  *
1042  * As a contrast, with implicit fencing the kernel keeps track of any
1043  * ongoing rendering, and automatically ensures that the atomic update waits
1044  * for any pending rendering to complete. This is usually tracked in &struct
1045  * dma_resv which can also contain mandatory kernel fences. Implicit syncing
1046  * is how Linux traditionally worked (e.g. DRI2/3 on X.org), whereas explicit
1047  * fencing is what Android wants.
1048  *
1049  * "IN_FENCE_FD”:
1050  *	Use this property to pass a fence that DRM should wait on before
1051  *	proceeding with the Atomic Commit request and show the framebuffer for
1052  *	the plane on the screen. The fence can be either a normal fence or a
1053  *	merged one, the sync_file framework will handle both cases and use a
1054  *	fence_array if a merged fence is received. Passing -1 here means no
1055  *	fences to wait on.
1056  *
1057  *	If the Atomic Commit request has the DRM_MODE_ATOMIC_TEST_ONLY flag
1058  *	it will only check if the Sync File is a valid one.
1059  *
1060  *	On the driver side the fence is stored on the @fence parameter of
1061  *	&struct drm_plane_state. Drivers which also support implicit fencing
1062  *	should extract the implicit fence using drm_gem_plane_helper_prepare_fb(),
1063  *	to make sure there's consistent behaviour between drivers in precedence
1064  *	of implicit vs. explicit fencing.
1065  *
1066  * "OUT_FENCE_PTR”:
1067  *	Use this property to pass a file descriptor pointer to DRM. Once the
1068  *	Atomic Commit request call returns OUT_FENCE_PTR will be filled with
1069  *	the file descriptor number of a Sync File. This Sync File contains the
1070  *	CRTC fence that will be signaled when all framebuffers present on the
1071  *	Atomic Commit * request for that given CRTC are scanned out on the
1072  *	screen.
1073  *
1074  *	The Atomic Commit request fails if a invalid pointer is passed. If the
1075  *	Atomic Commit request fails for any other reason the out fence fd
1076  *	returned will be -1. On a Atomic Commit with the
1077  *	DRM_MODE_ATOMIC_TEST_ONLY flag the out fence will also be set to -1.
1078  *
1079  *	Note that out-fences don't have a special interface to drivers and are
1080  *	internally represented by a &struct drm_pending_vblank_event in struct
1081  *	&drm_crtc_state, which is also used by the nonblocking atomic commit
1082  *	helpers and for the DRM event handling for existing userspace.
1083  */
1084 
1085 struct drm_out_fence_state {
1086 	s32 __user *out_fence_ptr;
1087 	struct sync_file *sync_file;
1088 	int fd;
1089 };
1090 
1091 static int setup_out_fence(struct drm_out_fence_state *fence_state,
1092 			   struct dma_fence *fence)
1093 {
1094 	fence_state->fd = get_unused_fd_flags(O_CLOEXEC);
1095 	if (fence_state->fd < 0)
1096 		return fence_state->fd;
1097 
1098 	if (put_user(fence_state->fd, fence_state->out_fence_ptr))
1099 		return -EFAULT;
1100 
1101 	fence_state->sync_file = sync_file_create(fence);
1102 	if (!fence_state->sync_file)
1103 		return -ENOMEM;
1104 
1105 	return 0;
1106 }
1107 
1108 static int prepare_signaling(struct drm_device *dev,
1109 				  struct drm_atomic_state *state,
1110 				  struct drm_mode_atomic *arg,
1111 				  struct drm_file *file_priv,
1112 				  struct drm_out_fence_state **fence_state,
1113 				  unsigned int *num_fences)
1114 {
1115 	struct drm_crtc *crtc;
1116 	struct drm_crtc_state *crtc_state;
1117 	struct drm_connector *conn;
1118 	struct drm_connector_state *conn_state;
1119 	int i, c = 0, ret;
1120 
1121 	if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)
1122 		return 0;
1123 
1124 	for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1125 		s32 __user *fence_ptr;
1126 
1127 		fence_ptr = get_out_fence_for_crtc(crtc_state->state, crtc);
1128 
1129 		if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT || fence_ptr) {
1130 			struct drm_pending_vblank_event *e;
1131 
1132 			e = create_vblank_event(crtc, arg->user_data);
1133 			if (!e)
1134 				return -ENOMEM;
1135 
1136 			crtc_state->event = e;
1137 		}
1138 
1139 		if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
1140 			struct drm_pending_vblank_event *e = crtc_state->event;
1141 
1142 			if (!file_priv)
1143 				continue;
1144 
1145 			ret = drm_event_reserve_init(dev, file_priv, &e->base,
1146 						     &e->event.base);
1147 			if (ret) {
1148 				kfree(e);
1149 				crtc_state->event = NULL;
1150 				return ret;
1151 			}
1152 		}
1153 
1154 		if (fence_ptr) {
1155 			struct dma_fence *fence;
1156 			struct drm_out_fence_state *f;
1157 
1158 			f = krealloc(*fence_state, sizeof(**fence_state) *
1159 				     (*num_fences + 1), GFP_KERNEL);
1160 			if (!f)
1161 				return -ENOMEM;
1162 
1163 			memset(&f[*num_fences], 0, sizeof(*f));
1164 
1165 			f[*num_fences].out_fence_ptr = fence_ptr;
1166 			*fence_state = f;
1167 
1168 			fence = drm_crtc_create_fence(crtc);
1169 			if (!fence)
1170 				return -ENOMEM;
1171 
1172 			ret = setup_out_fence(&f[(*num_fences)++], fence);
1173 			if (ret) {
1174 				dma_fence_put(fence);
1175 				return ret;
1176 			}
1177 
1178 			crtc_state->event->base.fence = fence;
1179 		}
1180 
1181 		c++;
1182 	}
1183 
1184 	for_each_new_connector_in_state(state, conn, conn_state, i) {
1185 		struct drm_writeback_connector *wb_conn;
1186 		struct drm_out_fence_state *f;
1187 		struct dma_fence *fence;
1188 		s32 __user *fence_ptr;
1189 
1190 		if (!conn_state->writeback_job)
1191 			continue;
1192 
1193 		fence_ptr = get_out_fence_for_connector(state, conn);
1194 		if (!fence_ptr)
1195 			continue;
1196 
1197 		f = krealloc(*fence_state, sizeof(**fence_state) *
1198 			     (*num_fences + 1), GFP_KERNEL);
1199 		if (!f)
1200 			return -ENOMEM;
1201 
1202 		memset(&f[*num_fences], 0, sizeof(*f));
1203 
1204 		f[*num_fences].out_fence_ptr = fence_ptr;
1205 		*fence_state = f;
1206 
1207 		wb_conn = drm_connector_to_writeback(conn);
1208 		fence = drm_writeback_get_out_fence(wb_conn);
1209 		if (!fence)
1210 			return -ENOMEM;
1211 
1212 		ret = setup_out_fence(&f[(*num_fences)++], fence);
1213 		if (ret) {
1214 			dma_fence_put(fence);
1215 			return ret;
1216 		}
1217 
1218 		conn_state->writeback_job->out_fence = fence;
1219 	}
1220 
1221 	/*
1222 	 * Having this flag means user mode pends on event which will never
1223 	 * reach due to lack of at least one CRTC for signaling
1224 	 */
1225 	if (c == 0 && (arg->flags & DRM_MODE_PAGE_FLIP_EVENT))
1226 		return -EINVAL;
1227 
1228 	return 0;
1229 }
1230 
1231 static void complete_signaling(struct drm_device *dev,
1232 			       struct drm_atomic_state *state,
1233 			       struct drm_out_fence_state *fence_state,
1234 			       unsigned int num_fences,
1235 			       bool install_fds)
1236 {
1237 	struct drm_crtc *crtc;
1238 	struct drm_crtc_state *crtc_state;
1239 	int i;
1240 
1241 	if (install_fds) {
1242 		for (i = 0; i < num_fences; i++)
1243 			fd_install(fence_state[i].fd,
1244 				   fence_state[i].sync_file->file);
1245 
1246 		kfree(fence_state);
1247 		return;
1248 	}
1249 
1250 	for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1251 		struct drm_pending_vblank_event *event = crtc_state->event;
1252 		/*
1253 		 * Free the allocated event. drm_atomic_helper_setup_commit
1254 		 * can allocate an event too, so only free it if it's ours
1255 		 * to prevent a double free in drm_atomic_state_clear.
1256 		 */
1257 		if (event && (event->base.fence || event->base.file_priv)) {
1258 			drm_event_cancel_free(dev, &event->base);
1259 			crtc_state->event = NULL;
1260 		}
1261 	}
1262 
1263 	if (!fence_state)
1264 		return;
1265 
1266 	for (i = 0; i < num_fences; i++) {
1267 		if (fence_state[i].sync_file)
1268 			fput(fence_state[i].sync_file->file);
1269 		if (fence_state[i].fd >= 0)
1270 			put_unused_fd(fence_state[i].fd);
1271 
1272 		/* If this fails log error to the user */
1273 		if (fence_state[i].out_fence_ptr &&
1274 		    put_user(-1, fence_state[i].out_fence_ptr))
1275 			drm_dbg_atomic(dev, "Couldn't clear out_fence_ptr\n");
1276 	}
1277 
1278 	kfree(fence_state);
1279 }
1280 
1281 int drm_mode_atomic_ioctl(struct drm_device *dev,
1282 			  void *data, struct drm_file *file_priv)
1283 {
1284 	struct drm_mode_atomic *arg = data;
1285 	uint32_t __user *objs_ptr = (uint32_t __user *)(unsigned long)(arg->objs_ptr);
1286 	uint32_t __user *count_props_ptr = (uint32_t __user *)(unsigned long)(arg->count_props_ptr);
1287 	uint32_t __user *props_ptr = (uint32_t __user *)(unsigned long)(arg->props_ptr);
1288 	uint64_t __user *prop_values_ptr = (uint64_t __user *)(unsigned long)(arg->prop_values_ptr);
1289 	unsigned int copied_objs, copied_props;
1290 	struct drm_atomic_state *state;
1291 	struct drm_modeset_acquire_ctx ctx;
1292 	struct drm_out_fence_state *fence_state;
1293 	int ret = 0;
1294 	unsigned int i, j, num_fences;
1295 
1296 	/* disallow for drivers not supporting atomic: */
1297 	if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
1298 		return -EOPNOTSUPP;
1299 
1300 	/* disallow for userspace that has not enabled atomic cap (even
1301 	 * though this may be a bit overkill, since legacy userspace
1302 	 * wouldn't know how to call this ioctl)
1303 	 */
1304 	if (!file_priv->atomic) {
1305 		drm_dbg_atomic(dev,
1306 			       "commit failed: atomic cap not enabled\n");
1307 		return -EINVAL;
1308 	}
1309 
1310 	if (arg->flags & ~DRM_MODE_ATOMIC_FLAGS) {
1311 		drm_dbg_atomic(dev, "commit failed: invalid flag\n");
1312 		return -EINVAL;
1313 	}
1314 
1315 	if (arg->reserved) {
1316 		drm_dbg_atomic(dev, "commit failed: reserved field set\n");
1317 		return -EINVAL;
1318 	}
1319 
1320 	if (arg->flags & DRM_MODE_PAGE_FLIP_ASYNC) {
1321 		drm_dbg_atomic(dev,
1322 			       "commit failed: invalid flag DRM_MODE_PAGE_FLIP_ASYNC\n");
1323 		return -EINVAL;
1324 	}
1325 
1326 	/* can't test and expect an event at the same time. */
1327 	if ((arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) &&
1328 			(arg->flags & DRM_MODE_PAGE_FLIP_EVENT)) {
1329 		drm_dbg_atomic(dev,
1330 			       "commit failed: page-flip event requested with test-only commit\n");
1331 		return -EINVAL;
1332 	}
1333 
1334 	state = drm_atomic_state_alloc(dev);
1335 	if (!state)
1336 		return -ENOMEM;
1337 
1338 	drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
1339 	state->acquire_ctx = &ctx;
1340 	state->allow_modeset = !!(arg->flags & DRM_MODE_ATOMIC_ALLOW_MODESET);
1341 
1342 retry:
1343 	copied_objs = 0;
1344 	copied_props = 0;
1345 	fence_state = NULL;
1346 	num_fences = 0;
1347 
1348 	for (i = 0; i < arg->count_objs; i++) {
1349 		uint32_t obj_id, count_props;
1350 		struct drm_mode_object *obj;
1351 
1352 		if (get_user(obj_id, objs_ptr + copied_objs)) {
1353 			ret = -EFAULT;
1354 			goto out;
1355 		}
1356 
1357 		obj = drm_mode_object_find(dev, file_priv, obj_id, DRM_MODE_OBJECT_ANY);
1358 		if (!obj) {
1359 			ret = -ENOENT;
1360 			goto out;
1361 		}
1362 
1363 		if (!obj->properties) {
1364 			drm_mode_object_put(obj);
1365 			ret = -ENOENT;
1366 			goto out;
1367 		}
1368 
1369 		if (get_user(count_props, count_props_ptr + copied_objs)) {
1370 			drm_mode_object_put(obj);
1371 			ret = -EFAULT;
1372 			goto out;
1373 		}
1374 
1375 		copied_objs++;
1376 
1377 		for (j = 0; j < count_props; j++) {
1378 			uint32_t prop_id;
1379 			uint64_t prop_value;
1380 			struct drm_property *prop;
1381 
1382 			if (get_user(prop_id, props_ptr + copied_props)) {
1383 				drm_mode_object_put(obj);
1384 				ret = -EFAULT;
1385 				goto out;
1386 			}
1387 
1388 			prop = drm_mode_obj_find_prop_id(obj, prop_id);
1389 			if (!prop) {
1390 				drm_mode_object_put(obj);
1391 				ret = -ENOENT;
1392 				goto out;
1393 			}
1394 
1395 			if (copy_from_user(&prop_value,
1396 					   prop_values_ptr + copied_props,
1397 					   sizeof(prop_value))) {
1398 				drm_mode_object_put(obj);
1399 				ret = -EFAULT;
1400 				goto out;
1401 			}
1402 
1403 			ret = drm_atomic_set_property(state, file_priv,
1404 						      obj, prop, prop_value);
1405 			if (ret) {
1406 				drm_mode_object_put(obj);
1407 				goto out;
1408 			}
1409 
1410 			copied_props++;
1411 		}
1412 
1413 		drm_mode_object_put(obj);
1414 	}
1415 
1416 	ret = prepare_signaling(dev, state, arg, file_priv, &fence_state,
1417 				&num_fences);
1418 	if (ret)
1419 		goto out;
1420 
1421 	if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) {
1422 		ret = drm_atomic_check_only(state);
1423 	} else if (arg->flags & DRM_MODE_ATOMIC_NONBLOCK) {
1424 		ret = drm_atomic_nonblocking_commit(state);
1425 	} else {
1426 		ret = drm_atomic_commit(state);
1427 	}
1428 
1429 out:
1430 	complete_signaling(dev, state, fence_state, num_fences, !ret);
1431 
1432 	if (ret == -EDEADLK) {
1433 		drm_atomic_state_clear(state);
1434 		ret = drm_modeset_backoff(&ctx);
1435 		if (!ret)
1436 			goto retry;
1437 	}
1438 
1439 	drm_atomic_state_put(state);
1440 
1441 	drm_modeset_drop_locks(&ctx);
1442 	drm_modeset_acquire_fini(&ctx);
1443 
1444 	return ret;
1445 }
1446