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