xref: /openbmc/linux/drivers/gpu/drm/drm_atomic_uapi.c (revision abade675e02e1b73da0c20ffaf08fbe309038298)
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 	bool replaced = false;
680 	int ret;
681 
682 	if (property == config->prop_crtc_id) {
683 		struct drm_crtc *crtc = drm_crtc_find(dev, file_priv, val);
684 		if (val && !crtc)
685 			return -EACCES;
686 		return drm_atomic_set_crtc_for_connector(state, crtc);
687 	} else if (property == config->dpms_property) {
688 		/* setting DPMS property requires special handling, which
689 		 * is done in legacy setprop path for us.  Disallow (for
690 		 * now?) atomic writes to DPMS property:
691 		 */
692 		return -EINVAL;
693 	} else if (property == config->tv_select_subconnector_property) {
694 		state->tv.subconnector = val;
695 	} else if (property == config->tv_left_margin_property) {
696 		state->tv.margins.left = val;
697 	} else if (property == config->tv_right_margin_property) {
698 		state->tv.margins.right = val;
699 	} else if (property == config->tv_top_margin_property) {
700 		state->tv.margins.top = val;
701 	} else if (property == config->tv_bottom_margin_property) {
702 		state->tv.margins.bottom = val;
703 	} else if (property == config->tv_mode_property) {
704 		state->tv.mode = val;
705 	} else if (property == config->tv_brightness_property) {
706 		state->tv.brightness = val;
707 	} else if (property == config->tv_contrast_property) {
708 		state->tv.contrast = val;
709 	} else if (property == config->tv_flicker_reduction_property) {
710 		state->tv.flicker_reduction = val;
711 	} else if (property == config->tv_overscan_property) {
712 		state->tv.overscan = val;
713 	} else if (property == config->tv_saturation_property) {
714 		state->tv.saturation = val;
715 	} else if (property == config->tv_hue_property) {
716 		state->tv.hue = val;
717 	} else if (property == config->link_status_property) {
718 		/* Never downgrade from GOOD to BAD on userspace's request here,
719 		 * only hw issues can do that.
720 		 *
721 		 * For an atomic property the userspace doesn't need to be able
722 		 * to understand all the properties, but needs to be able to
723 		 * restore the state it wants on VT switch. So if the userspace
724 		 * tries to change the link_status from GOOD to BAD, driver
725 		 * silently rejects it and returns a 0. This prevents userspace
726 		 * from accidently breaking  the display when it restores the
727 		 * state.
728 		 */
729 		if (state->link_status != DRM_LINK_STATUS_GOOD)
730 			state->link_status = val;
731 	} else if (property == config->hdr_output_metadata_property) {
732 		ret = drm_atomic_replace_property_blob_from_id(dev,
733 				&state->hdr_output_metadata,
734 				val,
735 				sizeof(struct hdr_output_metadata), -1,
736 				&replaced);
737 		return ret;
738 	} else if (property == config->aspect_ratio_property) {
739 		state->picture_aspect_ratio = val;
740 	} else if (property == config->content_type_property) {
741 		state->content_type = val;
742 	} else if (property == connector->scaling_mode_property) {
743 		state->scaling_mode = val;
744 	} else if (property == config->content_protection_property) {
745 		if (val == DRM_MODE_CONTENT_PROTECTION_ENABLED) {
746 			DRM_DEBUG_KMS("only drivers can set CP Enabled\n");
747 			return -EINVAL;
748 		}
749 		state->content_protection = val;
750 	} else if (property == connector->colorspace_property) {
751 		state->colorspace = val;
752 	} else if (property == config->writeback_fb_id_property) {
753 		struct drm_framebuffer *fb;
754 		int ret;
755 		fb = drm_framebuffer_lookup(dev, file_priv, val);
756 		ret = drm_atomic_set_writeback_fb_for_connector(state, fb);
757 		if (fb)
758 			drm_framebuffer_put(fb);
759 		return ret;
760 	} else if (property == config->writeback_out_fence_ptr_property) {
761 		s32 __user *fence_ptr = u64_to_user_ptr(val);
762 
763 		return set_out_fence_for_connector(state->state, connector,
764 						   fence_ptr);
765 	} else if (property == connector->max_bpc_property) {
766 		state->max_requested_bpc = val;
767 	} else if (connector->funcs->atomic_set_property) {
768 		return connector->funcs->atomic_set_property(connector,
769 				state, property, val);
770 	} else {
771 		DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] unknown property [PROP:%d:%s]]\n",
772 				 connector->base.id, connector->name,
773 				 property->base.id, property->name);
774 		return -EINVAL;
775 	}
776 
777 	return 0;
778 }
779 
780 static int
781 drm_atomic_connector_get_property(struct drm_connector *connector,
782 		const struct drm_connector_state *state,
783 		struct drm_property *property, uint64_t *val)
784 {
785 	struct drm_device *dev = connector->dev;
786 	struct drm_mode_config *config = &dev->mode_config;
787 
788 	if (property == config->prop_crtc_id) {
789 		*val = (state->crtc) ? state->crtc->base.id : 0;
790 	} else if (property == config->dpms_property) {
791 		*val = connector->dpms;
792 	} else if (property == config->tv_select_subconnector_property) {
793 		*val = state->tv.subconnector;
794 	} else if (property == config->tv_left_margin_property) {
795 		*val = state->tv.margins.left;
796 	} else if (property == config->tv_right_margin_property) {
797 		*val = state->tv.margins.right;
798 	} else if (property == config->tv_top_margin_property) {
799 		*val = state->tv.margins.top;
800 	} else if (property == config->tv_bottom_margin_property) {
801 		*val = state->tv.margins.bottom;
802 	} else if (property == config->tv_mode_property) {
803 		*val = state->tv.mode;
804 	} else if (property == config->tv_brightness_property) {
805 		*val = state->tv.brightness;
806 	} else if (property == config->tv_contrast_property) {
807 		*val = state->tv.contrast;
808 	} else if (property == config->tv_flicker_reduction_property) {
809 		*val = state->tv.flicker_reduction;
810 	} else if (property == config->tv_overscan_property) {
811 		*val = state->tv.overscan;
812 	} else if (property == config->tv_saturation_property) {
813 		*val = state->tv.saturation;
814 	} else if (property == config->tv_hue_property) {
815 		*val = state->tv.hue;
816 	} else if (property == config->link_status_property) {
817 		*val = state->link_status;
818 	} else if (property == config->aspect_ratio_property) {
819 		*val = state->picture_aspect_ratio;
820 	} else if (property == config->content_type_property) {
821 		*val = state->content_type;
822 	} else if (property == connector->colorspace_property) {
823 		*val = state->colorspace;
824 	} else if (property == connector->scaling_mode_property) {
825 		*val = state->scaling_mode;
826 	} else if (property == config->hdr_output_metadata_property) {
827 		*val = state->hdr_output_metadata ?
828 			state->hdr_output_metadata->base.id : 0;
829 	} else if (property == config->content_protection_property) {
830 		*val = state->content_protection;
831 	} else if (property == config->writeback_fb_id_property) {
832 		/* Writeback framebuffer is one-shot, write and forget */
833 		*val = 0;
834 	} else if (property == config->writeback_out_fence_ptr_property) {
835 		*val = 0;
836 	} else if (property == connector->max_bpc_property) {
837 		*val = state->max_requested_bpc;
838 	} else if (connector->funcs->atomic_get_property) {
839 		return connector->funcs->atomic_get_property(connector,
840 				state, property, val);
841 	} else {
842 		return -EINVAL;
843 	}
844 
845 	return 0;
846 }
847 
848 int drm_atomic_get_property(struct drm_mode_object *obj,
849 		struct drm_property *property, uint64_t *val)
850 {
851 	struct drm_device *dev = property->dev;
852 	int ret;
853 
854 	switch (obj->type) {
855 	case DRM_MODE_OBJECT_CONNECTOR: {
856 		struct drm_connector *connector = obj_to_connector(obj);
857 		WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
858 		ret = drm_atomic_connector_get_property(connector,
859 				connector->state, property, val);
860 		break;
861 	}
862 	case DRM_MODE_OBJECT_CRTC: {
863 		struct drm_crtc *crtc = obj_to_crtc(obj);
864 		WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
865 		ret = drm_atomic_crtc_get_property(crtc,
866 				crtc->state, property, val);
867 		break;
868 	}
869 	case DRM_MODE_OBJECT_PLANE: {
870 		struct drm_plane *plane = obj_to_plane(obj);
871 		WARN_ON(!drm_modeset_is_locked(&plane->mutex));
872 		ret = drm_atomic_plane_get_property(plane,
873 				plane->state, property, val);
874 		break;
875 	}
876 	default:
877 		ret = -EINVAL;
878 		break;
879 	}
880 
881 	return ret;
882 }
883 
884 /*
885  * The big monster ioctl
886  */
887 
888 static struct drm_pending_vblank_event *create_vblank_event(
889 		struct drm_crtc *crtc, uint64_t user_data)
890 {
891 	struct drm_pending_vblank_event *e = NULL;
892 
893 	e = kzalloc(sizeof *e, GFP_KERNEL);
894 	if (!e)
895 		return NULL;
896 
897 	e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
898 	e->event.base.length = sizeof(e->event);
899 	e->event.vbl.crtc_id = crtc->base.id;
900 	e->event.vbl.user_data = user_data;
901 
902 	return e;
903 }
904 
905 int drm_atomic_connector_commit_dpms(struct drm_atomic_state *state,
906 				     struct drm_connector *connector,
907 				     int mode)
908 {
909 	struct drm_connector *tmp_connector;
910 	struct drm_connector_state *new_conn_state;
911 	struct drm_crtc *crtc;
912 	struct drm_crtc_state *crtc_state;
913 	int i, ret, old_mode = connector->dpms;
914 	bool active = false;
915 
916 	ret = drm_modeset_lock(&state->dev->mode_config.connection_mutex,
917 			       state->acquire_ctx);
918 	if (ret)
919 		return ret;
920 
921 	if (mode != DRM_MODE_DPMS_ON)
922 		mode = DRM_MODE_DPMS_OFF;
923 	connector->dpms = mode;
924 
925 	crtc = connector->state->crtc;
926 	if (!crtc)
927 		goto out;
928 	ret = drm_atomic_add_affected_connectors(state, crtc);
929 	if (ret)
930 		goto out;
931 
932 	crtc_state = drm_atomic_get_crtc_state(state, crtc);
933 	if (IS_ERR(crtc_state)) {
934 		ret = PTR_ERR(crtc_state);
935 		goto out;
936 	}
937 
938 	for_each_new_connector_in_state(state, tmp_connector, new_conn_state, i) {
939 		if (new_conn_state->crtc != crtc)
940 			continue;
941 		if (tmp_connector->dpms == DRM_MODE_DPMS_ON) {
942 			active = true;
943 			break;
944 		}
945 	}
946 
947 	crtc_state->active = active;
948 	ret = drm_atomic_commit(state);
949 out:
950 	if (ret != 0)
951 		connector->dpms = old_mode;
952 	return ret;
953 }
954 
955 int drm_atomic_set_property(struct drm_atomic_state *state,
956 			    struct drm_file *file_priv,
957 			    struct drm_mode_object *obj,
958 			    struct drm_property *prop,
959 			    uint64_t prop_value)
960 {
961 	struct drm_mode_object *ref;
962 	int ret;
963 
964 	if (!drm_property_change_valid_get(prop, prop_value, &ref))
965 		return -EINVAL;
966 
967 	switch (obj->type) {
968 	case DRM_MODE_OBJECT_CONNECTOR: {
969 		struct drm_connector *connector = obj_to_connector(obj);
970 		struct drm_connector_state *connector_state;
971 
972 		connector_state = drm_atomic_get_connector_state(state, connector);
973 		if (IS_ERR(connector_state)) {
974 			ret = PTR_ERR(connector_state);
975 			break;
976 		}
977 
978 		ret = drm_atomic_connector_set_property(connector,
979 				connector_state, file_priv,
980 				prop, prop_value);
981 		break;
982 	}
983 	case DRM_MODE_OBJECT_CRTC: {
984 		struct drm_crtc *crtc = obj_to_crtc(obj);
985 		struct drm_crtc_state *crtc_state;
986 
987 		crtc_state = drm_atomic_get_crtc_state(state, crtc);
988 		if (IS_ERR(crtc_state)) {
989 			ret = PTR_ERR(crtc_state);
990 			break;
991 		}
992 
993 		ret = drm_atomic_crtc_set_property(crtc,
994 				crtc_state, prop, prop_value);
995 		break;
996 	}
997 	case DRM_MODE_OBJECT_PLANE: {
998 		struct drm_plane *plane = obj_to_plane(obj);
999 		struct drm_plane_state *plane_state;
1000 
1001 		plane_state = drm_atomic_get_plane_state(state, plane);
1002 		if (IS_ERR(plane_state)) {
1003 			ret = PTR_ERR(plane_state);
1004 			break;
1005 		}
1006 
1007 		ret = drm_atomic_plane_set_property(plane,
1008 				plane_state, file_priv,
1009 				prop, prop_value);
1010 		break;
1011 	}
1012 	default:
1013 		ret = -EINVAL;
1014 		break;
1015 	}
1016 
1017 	drm_property_change_valid_put(prop, ref);
1018 	return ret;
1019 }
1020 
1021 /**
1022  * DOC: explicit fencing properties
1023  *
1024  * Explicit fencing allows userspace to control the buffer synchronization
1025  * between devices. A Fence or a group of fences are transfered to/from
1026  * userspace using Sync File fds and there are two DRM properties for that.
1027  * IN_FENCE_FD on each DRM Plane to send fences to the kernel and
1028  * OUT_FENCE_PTR on each DRM CRTC to receive fences from the kernel.
1029  *
1030  * As a contrast, with implicit fencing the kernel keeps track of any
1031  * ongoing rendering, and automatically ensures that the atomic update waits
1032  * for any pending rendering to complete. For shared buffers represented with
1033  * a &struct dma_buf this is tracked in &struct reservation_object.
1034  * Implicit syncing is how Linux traditionally worked (e.g. DRI2/3 on X.org),
1035  * whereas explicit fencing is what Android wants.
1036  *
1037  * "IN_FENCE_FD”:
1038  *	Use this property to pass a fence that DRM should wait on before
1039  *	proceeding with the Atomic Commit request and show the framebuffer for
1040  *	the plane on the screen. The fence can be either a normal fence or a
1041  *	merged one, the sync_file framework will handle both cases and use a
1042  *	fence_array if a merged fence is received. Passing -1 here means no
1043  *	fences to wait on.
1044  *
1045  *	If the Atomic Commit request has the DRM_MODE_ATOMIC_TEST_ONLY flag
1046  *	it will only check if the Sync File is a valid one.
1047  *
1048  *	On the driver side the fence is stored on the @fence parameter of
1049  *	&struct drm_plane_state. Drivers which also support implicit fencing
1050  *	should set the implicit fence using drm_atomic_set_fence_for_plane(),
1051  *	to make sure there's consistent behaviour between drivers in precedence
1052  *	of implicit vs. explicit fencing.
1053  *
1054  * "OUT_FENCE_PTR”:
1055  *	Use this property to pass a file descriptor pointer to DRM. Once the
1056  *	Atomic Commit request call returns OUT_FENCE_PTR will be filled with
1057  *	the file descriptor number of a Sync File. This Sync File contains the
1058  *	CRTC fence that will be signaled when all framebuffers present on the
1059  *	Atomic Commit * request for that given CRTC are scanned out on the
1060  *	screen.
1061  *
1062  *	The Atomic Commit request fails if a invalid pointer is passed. If the
1063  *	Atomic Commit request fails for any other reason the out fence fd
1064  *	returned will be -1. On a Atomic Commit with the
1065  *	DRM_MODE_ATOMIC_TEST_ONLY flag the out fence will also be set to -1.
1066  *
1067  *	Note that out-fences don't have a special interface to drivers and are
1068  *	internally represented by a &struct drm_pending_vblank_event in struct
1069  *	&drm_crtc_state, which is also used by the nonblocking atomic commit
1070  *	helpers and for the DRM event handling for existing userspace.
1071  */
1072 
1073 struct drm_out_fence_state {
1074 	s32 __user *out_fence_ptr;
1075 	struct sync_file *sync_file;
1076 	int fd;
1077 };
1078 
1079 static int setup_out_fence(struct drm_out_fence_state *fence_state,
1080 			   struct dma_fence *fence)
1081 {
1082 	fence_state->fd = get_unused_fd_flags(O_CLOEXEC);
1083 	if (fence_state->fd < 0)
1084 		return fence_state->fd;
1085 
1086 	if (put_user(fence_state->fd, fence_state->out_fence_ptr))
1087 		return -EFAULT;
1088 
1089 	fence_state->sync_file = sync_file_create(fence);
1090 	if (!fence_state->sync_file)
1091 		return -ENOMEM;
1092 
1093 	return 0;
1094 }
1095 
1096 static int prepare_signaling(struct drm_device *dev,
1097 				  struct drm_atomic_state *state,
1098 				  struct drm_mode_atomic *arg,
1099 				  struct drm_file *file_priv,
1100 				  struct drm_out_fence_state **fence_state,
1101 				  unsigned int *num_fences)
1102 {
1103 	struct drm_crtc *crtc;
1104 	struct drm_crtc_state *crtc_state;
1105 	struct drm_connector *conn;
1106 	struct drm_connector_state *conn_state;
1107 	int i, c = 0, ret;
1108 
1109 	if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)
1110 		return 0;
1111 
1112 	for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1113 		s32 __user *fence_ptr;
1114 
1115 		fence_ptr = get_out_fence_for_crtc(crtc_state->state, crtc);
1116 
1117 		if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT || fence_ptr) {
1118 			struct drm_pending_vblank_event *e;
1119 
1120 			e = create_vblank_event(crtc, arg->user_data);
1121 			if (!e)
1122 				return -ENOMEM;
1123 
1124 			crtc_state->event = e;
1125 		}
1126 
1127 		if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
1128 			struct drm_pending_vblank_event *e = crtc_state->event;
1129 
1130 			if (!file_priv)
1131 				continue;
1132 
1133 			ret = drm_event_reserve_init(dev, file_priv, &e->base,
1134 						     &e->event.base);
1135 			if (ret) {
1136 				kfree(e);
1137 				crtc_state->event = NULL;
1138 				return ret;
1139 			}
1140 		}
1141 
1142 		if (fence_ptr) {
1143 			struct dma_fence *fence;
1144 			struct drm_out_fence_state *f;
1145 
1146 			f = krealloc(*fence_state, sizeof(**fence_state) *
1147 				     (*num_fences + 1), GFP_KERNEL);
1148 			if (!f)
1149 				return -ENOMEM;
1150 
1151 			memset(&f[*num_fences], 0, sizeof(*f));
1152 
1153 			f[*num_fences].out_fence_ptr = fence_ptr;
1154 			*fence_state = f;
1155 
1156 			fence = drm_crtc_create_fence(crtc);
1157 			if (!fence)
1158 				return -ENOMEM;
1159 
1160 			ret = setup_out_fence(&f[(*num_fences)++], fence);
1161 			if (ret) {
1162 				dma_fence_put(fence);
1163 				return ret;
1164 			}
1165 
1166 			crtc_state->event->base.fence = fence;
1167 		}
1168 
1169 		c++;
1170 	}
1171 
1172 	for_each_new_connector_in_state(state, conn, conn_state, i) {
1173 		struct drm_writeback_connector *wb_conn;
1174 		struct drm_out_fence_state *f;
1175 		struct dma_fence *fence;
1176 		s32 __user *fence_ptr;
1177 
1178 		if (!conn_state->writeback_job)
1179 			continue;
1180 
1181 		fence_ptr = get_out_fence_for_connector(state, conn);
1182 		if (!fence_ptr)
1183 			continue;
1184 
1185 		f = krealloc(*fence_state, sizeof(**fence_state) *
1186 			     (*num_fences + 1), GFP_KERNEL);
1187 		if (!f)
1188 			return -ENOMEM;
1189 
1190 		memset(&f[*num_fences], 0, sizeof(*f));
1191 
1192 		f[*num_fences].out_fence_ptr = fence_ptr;
1193 		*fence_state = f;
1194 
1195 		wb_conn = drm_connector_to_writeback(conn);
1196 		fence = drm_writeback_get_out_fence(wb_conn);
1197 		if (!fence)
1198 			return -ENOMEM;
1199 
1200 		ret = setup_out_fence(&f[(*num_fences)++], fence);
1201 		if (ret) {
1202 			dma_fence_put(fence);
1203 			return ret;
1204 		}
1205 
1206 		conn_state->writeback_job->out_fence = fence;
1207 	}
1208 
1209 	/*
1210 	 * Having this flag means user mode pends on event which will never
1211 	 * reach due to lack of at least one CRTC for signaling
1212 	 */
1213 	if (c == 0 && (arg->flags & DRM_MODE_PAGE_FLIP_EVENT))
1214 		return -EINVAL;
1215 
1216 	return 0;
1217 }
1218 
1219 static void complete_signaling(struct drm_device *dev,
1220 			       struct drm_atomic_state *state,
1221 			       struct drm_out_fence_state *fence_state,
1222 			       unsigned int num_fences,
1223 			       bool install_fds)
1224 {
1225 	struct drm_crtc *crtc;
1226 	struct drm_crtc_state *crtc_state;
1227 	int i;
1228 
1229 	if (install_fds) {
1230 		for (i = 0; i < num_fences; i++)
1231 			fd_install(fence_state[i].fd,
1232 				   fence_state[i].sync_file->file);
1233 
1234 		kfree(fence_state);
1235 		return;
1236 	}
1237 
1238 	for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1239 		struct drm_pending_vblank_event *event = crtc_state->event;
1240 		/*
1241 		 * Free the allocated event. drm_atomic_helper_setup_commit
1242 		 * can allocate an event too, so only free it if it's ours
1243 		 * to prevent a double free in drm_atomic_state_clear.
1244 		 */
1245 		if (event && (event->base.fence || event->base.file_priv)) {
1246 			drm_event_cancel_free(dev, &event->base);
1247 			crtc_state->event = NULL;
1248 		}
1249 	}
1250 
1251 	if (!fence_state)
1252 		return;
1253 
1254 	for (i = 0; i < num_fences; i++) {
1255 		if (fence_state[i].sync_file)
1256 			fput(fence_state[i].sync_file->file);
1257 		if (fence_state[i].fd >= 0)
1258 			put_unused_fd(fence_state[i].fd);
1259 
1260 		/* If this fails log error to the user */
1261 		if (fence_state[i].out_fence_ptr &&
1262 		    put_user(-1, fence_state[i].out_fence_ptr))
1263 			DRM_DEBUG_ATOMIC("Couldn't clear out_fence_ptr\n");
1264 	}
1265 
1266 	kfree(fence_state);
1267 }
1268 
1269 int drm_mode_atomic_ioctl(struct drm_device *dev,
1270 			  void *data, struct drm_file *file_priv)
1271 {
1272 	struct drm_mode_atomic *arg = data;
1273 	uint32_t __user *objs_ptr = (uint32_t __user *)(unsigned long)(arg->objs_ptr);
1274 	uint32_t __user *count_props_ptr = (uint32_t __user *)(unsigned long)(arg->count_props_ptr);
1275 	uint32_t __user *props_ptr = (uint32_t __user *)(unsigned long)(arg->props_ptr);
1276 	uint64_t __user *prop_values_ptr = (uint64_t __user *)(unsigned long)(arg->prop_values_ptr);
1277 	unsigned int copied_objs, copied_props;
1278 	struct drm_atomic_state *state;
1279 	struct drm_modeset_acquire_ctx ctx;
1280 	struct drm_out_fence_state *fence_state;
1281 	int ret = 0;
1282 	unsigned int i, j, num_fences;
1283 
1284 	/* disallow for drivers not supporting atomic: */
1285 	if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
1286 		return -EOPNOTSUPP;
1287 
1288 	/* disallow for userspace that has not enabled atomic cap (even
1289 	 * though this may be a bit overkill, since legacy userspace
1290 	 * wouldn't know how to call this ioctl)
1291 	 */
1292 	if (!file_priv->atomic)
1293 		return -EINVAL;
1294 
1295 	if (arg->flags & ~DRM_MODE_ATOMIC_FLAGS)
1296 		return -EINVAL;
1297 
1298 	if (arg->reserved)
1299 		return -EINVAL;
1300 
1301 	if ((arg->flags & DRM_MODE_PAGE_FLIP_ASYNC) &&
1302 			!dev->mode_config.async_page_flip)
1303 		return -EINVAL;
1304 
1305 	/* can't test and expect an event at the same time. */
1306 	if ((arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) &&
1307 			(arg->flags & DRM_MODE_PAGE_FLIP_EVENT))
1308 		return -EINVAL;
1309 
1310 	state = drm_atomic_state_alloc(dev);
1311 	if (!state)
1312 		return -ENOMEM;
1313 
1314 	drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
1315 	state->acquire_ctx = &ctx;
1316 	state->allow_modeset = !!(arg->flags & DRM_MODE_ATOMIC_ALLOW_MODESET);
1317 
1318 retry:
1319 	copied_objs = 0;
1320 	copied_props = 0;
1321 	fence_state = NULL;
1322 	num_fences = 0;
1323 
1324 	for (i = 0; i < arg->count_objs; i++) {
1325 		uint32_t obj_id, count_props;
1326 		struct drm_mode_object *obj;
1327 
1328 		if (get_user(obj_id, objs_ptr + copied_objs)) {
1329 			ret = -EFAULT;
1330 			goto out;
1331 		}
1332 
1333 		obj = drm_mode_object_find(dev, file_priv, obj_id, DRM_MODE_OBJECT_ANY);
1334 		if (!obj) {
1335 			ret = -ENOENT;
1336 			goto out;
1337 		}
1338 
1339 		if (!obj->properties) {
1340 			drm_mode_object_put(obj);
1341 			ret = -ENOENT;
1342 			goto out;
1343 		}
1344 
1345 		if (get_user(count_props, count_props_ptr + copied_objs)) {
1346 			drm_mode_object_put(obj);
1347 			ret = -EFAULT;
1348 			goto out;
1349 		}
1350 
1351 		copied_objs++;
1352 
1353 		for (j = 0; j < count_props; j++) {
1354 			uint32_t prop_id;
1355 			uint64_t prop_value;
1356 			struct drm_property *prop;
1357 
1358 			if (get_user(prop_id, props_ptr + copied_props)) {
1359 				drm_mode_object_put(obj);
1360 				ret = -EFAULT;
1361 				goto out;
1362 			}
1363 
1364 			prop = drm_mode_obj_find_prop_id(obj, prop_id);
1365 			if (!prop) {
1366 				drm_mode_object_put(obj);
1367 				ret = -ENOENT;
1368 				goto out;
1369 			}
1370 
1371 			if (copy_from_user(&prop_value,
1372 					   prop_values_ptr + copied_props,
1373 					   sizeof(prop_value))) {
1374 				drm_mode_object_put(obj);
1375 				ret = -EFAULT;
1376 				goto out;
1377 			}
1378 
1379 			ret = drm_atomic_set_property(state, file_priv,
1380 						      obj, prop, prop_value);
1381 			if (ret) {
1382 				drm_mode_object_put(obj);
1383 				goto out;
1384 			}
1385 
1386 			copied_props++;
1387 		}
1388 
1389 		drm_mode_object_put(obj);
1390 	}
1391 
1392 	ret = prepare_signaling(dev, state, arg, file_priv, &fence_state,
1393 				&num_fences);
1394 	if (ret)
1395 		goto out;
1396 
1397 	if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) {
1398 		ret = drm_atomic_check_only(state);
1399 	} else if (arg->flags & DRM_MODE_ATOMIC_NONBLOCK) {
1400 		ret = drm_atomic_nonblocking_commit(state);
1401 	} else {
1402 		if (unlikely(drm_debug & DRM_UT_STATE))
1403 			drm_atomic_print_state(state);
1404 
1405 		ret = drm_atomic_commit(state);
1406 	}
1407 
1408 out:
1409 	complete_signaling(dev, state, fence_state, num_fences, !ret);
1410 
1411 	if (ret == -EDEADLK) {
1412 		drm_atomic_state_clear(state);
1413 		ret = drm_modeset_backoff(&ctx);
1414 		if (!ret)
1415 			goto retry;
1416 	}
1417 
1418 	drm_atomic_state_put(state);
1419 
1420 	drm_modeset_drop_locks(&ctx);
1421 	drm_modeset_acquire_fini(&ctx);
1422 
1423 	return ret;
1424 }
1425