1 /*
2  * Copyright (C) 2014 Red Hat
3  * Copyright (C) 2014 Intel Corp.
4  * Copyright (C) 2018 Intel Corp.
5  * Copyright (c) 2020, The Linux Foundation. All rights reserved.
6  *
7  * Permission is hereby granted, free of charge, to any person obtaining a
8  * copy of this software and associated documentation files (the "Software"),
9  * to deal in the Software without restriction, including without limitation
10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11  * and/or sell copies of the Software, and to permit persons to whom the
12  * Software is furnished to do so, subject to the following conditions:
13  *
14  * The above copyright notice and this permission notice shall be included in
15  * all copies or substantial portions of the Software.
16  *
17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
20  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23  * OTHER DEALINGS IN THE SOFTWARE.
24  *
25  * Authors:
26  * Rob Clark <robdclark@gmail.com>
27  * Daniel Vetter <daniel.vetter@ffwll.ch>
28  */
29 
30 #include <drm/drm_atomic_uapi.h>
31 #include <drm/drm_atomic.h>
32 #include <drm/drm_framebuffer.h>
33 #include <drm/drm_print.h>
34 #include <drm/drm_drv.h>
35 #include <drm/drm_writeback.h>
36 #include <drm/drm_vblank.h>
37 
38 #include <linux/dma-fence.h>
39 #include <linux/uaccess.h>
40 #include <linux/sync_file.h>
41 #include <linux/file.h>
42 
43 #include "drm_crtc_internal.h"
44 
45 /**
46  * DOC: overview
47  *
48  * This file contains the marshalling and demarshalling glue for the atomic UAPI
49  * in all its forms: The monster ATOMIC IOCTL itself, code for GET_PROPERTY and
50  * SET_PROPERTY IOCTLs. Plus interface functions for compatibility helpers and
51  * drivers which have special needs to construct their own atomic updates, e.g.
52  * for load detect or similar.
53  */
54 
55 /**
56  * drm_atomic_set_mode_for_crtc - set mode for CRTC
57  * @state: the CRTC whose incoming state to update
58  * @mode: kernel-internal mode to use for the CRTC, or NULL to disable
59  *
60  * Set a mode (originating from the kernel) on the desired CRTC state and update
61  * the enable property.
62  *
63  * RETURNS:
64  * Zero on success, error code on failure. Cannot return -EDEADLK.
65  */
66 int drm_atomic_set_mode_for_crtc(struct drm_crtc_state *state,
67 				 const struct drm_display_mode *mode)
68 {
69 	struct drm_crtc *crtc = state->crtc;
70 	struct drm_mode_modeinfo umode;
71 
72 	/* Early return for no change. */
73 	if (mode && memcmp(&state->mode, mode, sizeof(*mode)) == 0)
74 		return 0;
75 
76 	drm_property_blob_put(state->mode_blob);
77 	state->mode_blob = NULL;
78 
79 	if (mode) {
80 		struct drm_property_blob *blob;
81 
82 		drm_mode_convert_to_umode(&umode, mode);
83 		blob = drm_property_create_blob(crtc->dev,
84 						sizeof(umode), &umode);
85 		if (IS_ERR(blob))
86 			return PTR_ERR(blob);
87 
88 		drm_mode_copy(&state->mode, mode);
89 
90 		state->mode_blob = blob;
91 		state->enable = true;
92 		drm_dbg_atomic(crtc->dev,
93 			       "Set [MODE:%s] for [CRTC:%d:%s] state %p\n",
94 			       mode->name, crtc->base.id, crtc->name, state);
95 	} else {
96 		memset(&state->mode, 0, sizeof(state->mode));
97 		state->enable = false;
98 		drm_dbg_atomic(crtc->dev,
99 			       "Set [NOMODE] for [CRTC:%d:%s] state %p\n",
100 			       crtc->base.id, crtc->name, state);
101 	}
102 
103 	return 0;
104 }
105 EXPORT_SYMBOL(drm_atomic_set_mode_for_crtc);
106 
107 /**
108  * drm_atomic_set_mode_prop_for_crtc - set mode for CRTC
109  * @state: the CRTC whose incoming state to update
110  * @blob: pointer to blob property to use for mode
111  *
112  * Set a mode (originating from a blob property) on the desired CRTC state.
113  * This function will take a reference on the blob property for the CRTC state,
114  * and release the reference held on the state's existing mode property, if any
115  * was set.
116  *
117  * RETURNS:
118  * Zero on success, error code on failure. Cannot return -EDEADLK.
119  */
120 int drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state *state,
121 				      struct drm_property_blob *blob)
122 {
123 	struct drm_crtc *crtc = state->crtc;
124 
125 	if (blob == state->mode_blob)
126 		return 0;
127 
128 	drm_property_blob_put(state->mode_blob);
129 	state->mode_blob = NULL;
130 
131 	memset(&state->mode, 0, sizeof(state->mode));
132 
133 	if (blob) {
134 		int ret;
135 
136 		if (blob->length != sizeof(struct drm_mode_modeinfo)) {
137 			drm_dbg_atomic(crtc->dev,
138 				       "[CRTC:%d:%s] bad mode blob length: %zu\n",
139 				       crtc->base.id, crtc->name,
140 				       blob->length);
141 			return -EINVAL;
142 		}
143 
144 		ret = drm_mode_convert_umode(crtc->dev,
145 					     &state->mode, blob->data);
146 		if (ret) {
147 			drm_dbg_atomic(crtc->dev,
148 				       "[CRTC:%d:%s] invalid mode (ret=%d, status=%s):\n",
149 				       crtc->base.id, crtc->name,
150 				       ret, drm_get_mode_status_name(state->mode.status));
151 			drm_mode_debug_printmodeline(&state->mode);
152 			return -EINVAL;
153 		}
154 
155 		state->mode_blob = drm_property_blob_get(blob);
156 		state->enable = true;
157 		drm_dbg_atomic(crtc->dev,
158 			       "Set [MODE:%s] for [CRTC:%d:%s] state %p\n",
159 			       state->mode.name, crtc->base.id, crtc->name,
160 			       state);
161 	} else {
162 		state->enable = false;
163 		drm_dbg_atomic(crtc->dev,
164 			       "Set [NOMODE] for [CRTC:%d:%s] state %p\n",
165 			       crtc->base.id, crtc->name, state);
166 	}
167 
168 	return 0;
169 }
170 EXPORT_SYMBOL(drm_atomic_set_mode_prop_for_crtc);
171 
172 /**
173  * drm_atomic_set_crtc_for_plane - set CRTC for plane
174  * @plane_state: the plane whose incoming state to update
175  * @crtc: CRTC to use for the plane
176  *
177  * Changing the assigned CRTC for a plane requires us to grab the lock and state
178  * for the new CRTC, as needed. This function takes care of all these details
179  * besides updating the pointer in the state object itself.
180  *
181  * Returns:
182  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
183  * then the w/w mutex code has detected a deadlock and the entire atomic
184  * sequence must be restarted. All other errors are fatal.
185  */
186 int
187 drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state,
188 			      struct drm_crtc *crtc)
189 {
190 	struct drm_plane *plane = plane_state->plane;
191 	struct drm_crtc_state *crtc_state;
192 	/* Nothing to do for same crtc*/
193 	if (plane_state->crtc == crtc)
194 		return 0;
195 	if (plane_state->crtc) {
196 		crtc_state = drm_atomic_get_crtc_state(plane_state->state,
197 						       plane_state->crtc);
198 		if (WARN_ON(IS_ERR(crtc_state)))
199 			return PTR_ERR(crtc_state);
200 
201 		crtc_state->plane_mask &= ~drm_plane_mask(plane);
202 	}
203 
204 	plane_state->crtc = crtc;
205 
206 	if (crtc) {
207 		crtc_state = drm_atomic_get_crtc_state(plane_state->state,
208 						       crtc);
209 		if (IS_ERR(crtc_state))
210 			return PTR_ERR(crtc_state);
211 		crtc_state->plane_mask |= drm_plane_mask(plane);
212 	}
213 
214 	if (crtc)
215 		drm_dbg_atomic(plane->dev,
216 			       "Link [PLANE:%d:%s] state %p to [CRTC:%d:%s]\n",
217 			       plane->base.id, plane->name, plane_state,
218 			       crtc->base.id, crtc->name);
219 	else
220 		drm_dbg_atomic(plane->dev,
221 			       "Link [PLANE:%d:%s] state %p to [NOCRTC]\n",
222 			       plane->base.id, plane->name, plane_state);
223 
224 	return 0;
225 }
226 EXPORT_SYMBOL(drm_atomic_set_crtc_for_plane);
227 
228 /**
229  * drm_atomic_set_fb_for_plane - set framebuffer for plane
230  * @plane_state: atomic state object for the plane
231  * @fb: fb to use for the plane
232  *
233  * Changing the assigned framebuffer for a plane requires us to grab a reference
234  * to the new fb and drop the reference to the old fb, if there is one. This
235  * function takes care of all these details besides updating the pointer in the
236  * state object itself.
237  */
238 void
239 drm_atomic_set_fb_for_plane(struct drm_plane_state *plane_state,
240 			    struct drm_framebuffer *fb)
241 {
242 	struct drm_plane *plane = plane_state->plane;
243 
244 	if (fb)
245 		drm_dbg_atomic(plane->dev,
246 			       "Set [FB:%d] for [PLANE:%d:%s] state %p\n",
247 			       fb->base.id, plane->base.id, plane->name,
248 			       plane_state);
249 	else
250 		drm_dbg_atomic(plane->dev,
251 			       "Set [NOFB] for [PLANE:%d:%s] state %p\n",
252 			       plane->base.id, plane->name, plane_state);
253 
254 	drm_framebuffer_assign(&plane_state->fb, fb);
255 }
256 EXPORT_SYMBOL(drm_atomic_set_fb_for_plane);
257 
258 /**
259  * drm_atomic_set_crtc_for_connector - set CRTC for connector
260  * @conn_state: atomic state object for the connector
261  * @crtc: CRTC to use for the connector
262  *
263  * Changing the assigned CRTC for a connector requires us to grab the lock and
264  * state for the new CRTC, as needed. This function takes care of all these
265  * details besides updating the pointer in the state object itself.
266  *
267  * Returns:
268  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
269  * then the w/w mutex code has detected a deadlock and the entire atomic
270  * sequence must be restarted. All other errors are fatal.
271  */
272 int
273 drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
274 				  struct drm_crtc *crtc)
275 {
276 	struct drm_connector *connector = conn_state->connector;
277 	struct drm_crtc_state *crtc_state;
278 
279 	if (conn_state->crtc == crtc)
280 		return 0;
281 
282 	if (conn_state->crtc) {
283 		crtc_state = drm_atomic_get_new_crtc_state(conn_state->state,
284 							   conn_state->crtc);
285 
286 		crtc_state->connector_mask &=
287 			~drm_connector_mask(conn_state->connector);
288 
289 		drm_connector_put(conn_state->connector);
290 		conn_state->crtc = NULL;
291 	}
292 
293 	if (crtc) {
294 		crtc_state = drm_atomic_get_crtc_state(conn_state->state, crtc);
295 		if (IS_ERR(crtc_state))
296 			return PTR_ERR(crtc_state);
297 
298 		crtc_state->connector_mask |=
299 			drm_connector_mask(conn_state->connector);
300 
301 		drm_connector_get(conn_state->connector);
302 		conn_state->crtc = crtc;
303 
304 		drm_dbg_atomic(connector->dev,
305 			       "Link [CONNECTOR:%d:%s] state %p to [CRTC:%d:%s]\n",
306 			       connector->base.id, connector->name,
307 			       conn_state, crtc->base.id, crtc->name);
308 	} else {
309 		drm_dbg_atomic(connector->dev,
310 			       "Link [CONNECTOR:%d:%s] state %p to [NOCRTC]\n",
311 			       connector->base.id, connector->name,
312 			       conn_state);
313 	}
314 
315 	return 0;
316 }
317 EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector);
318 
319 static void set_out_fence_for_crtc(struct drm_atomic_state *state,
320 				   struct drm_crtc *crtc, s32 __user *fence_ptr)
321 {
322 	state->crtcs[drm_crtc_index(crtc)].out_fence_ptr = fence_ptr;
323 }
324 
325 static s32 __user *get_out_fence_for_crtc(struct drm_atomic_state *state,
326 					  struct drm_crtc *crtc)
327 {
328 	s32 __user *fence_ptr;
329 
330 	fence_ptr = state->crtcs[drm_crtc_index(crtc)].out_fence_ptr;
331 	state->crtcs[drm_crtc_index(crtc)].out_fence_ptr = NULL;
332 
333 	return fence_ptr;
334 }
335 
336 static int set_out_fence_for_connector(struct drm_atomic_state *state,
337 					struct drm_connector *connector,
338 					s32 __user *fence_ptr)
339 {
340 	unsigned int index = drm_connector_index(connector);
341 
342 	if (!fence_ptr)
343 		return 0;
344 
345 	if (put_user(-1, fence_ptr))
346 		return -EFAULT;
347 
348 	state->connectors[index].out_fence_ptr = fence_ptr;
349 
350 	return 0;
351 }
352 
353 static s32 __user *get_out_fence_for_connector(struct drm_atomic_state *state,
354 					       struct drm_connector *connector)
355 {
356 	unsigned int index = drm_connector_index(connector);
357 	s32 __user *fence_ptr;
358 
359 	fence_ptr = state->connectors[index].out_fence_ptr;
360 	state->connectors[index].out_fence_ptr = NULL;
361 
362 	return fence_ptr;
363 }
364 
365 static int
366 drm_atomic_replace_property_blob_from_id(struct drm_device *dev,
367 					 struct drm_property_blob **blob,
368 					 uint64_t blob_id,
369 					 ssize_t expected_size,
370 					 ssize_t expected_elem_size,
371 					 bool *replaced)
372 {
373 	struct drm_property_blob *new_blob = NULL;
374 
375 	if (blob_id != 0) {
376 		new_blob = drm_property_lookup_blob(dev, blob_id);
377 		if (new_blob == NULL) {
378 			drm_dbg_atomic(dev,
379 				       "cannot find blob ID %llu\n", blob_id);
380 			return -EINVAL;
381 		}
382 
383 		if (expected_size > 0 &&
384 		    new_blob->length != expected_size) {
385 			drm_dbg_atomic(dev,
386 				       "[BLOB:%d] length %zu different from expected %zu\n",
387 				       new_blob->base.id, new_blob->length, expected_size);
388 			drm_property_blob_put(new_blob);
389 			return -EINVAL;
390 		}
391 		if (expected_elem_size > 0 &&
392 		    new_blob->length % expected_elem_size != 0) {
393 			drm_dbg_atomic(dev,
394 				       "[BLOB:%d] length %zu not divisible by element size %zu\n",
395 				       new_blob->base.id, new_blob->length, expected_elem_size);
396 			drm_property_blob_put(new_blob);
397 			return -EINVAL;
398 		}
399 	}
400 
401 	*replaced |= drm_property_replace_blob(blob, new_blob);
402 	drm_property_blob_put(new_blob);
403 
404 	return 0;
405 }
406 
407 static int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
408 		struct drm_crtc_state *state, struct drm_property *property,
409 		uint64_t val)
410 {
411 	struct drm_device *dev = crtc->dev;
412 	struct drm_mode_config *config = &dev->mode_config;
413 	bool replaced = false;
414 	int ret;
415 
416 	if (property == config->prop_active)
417 		state->active = val;
418 	else if (property == config->prop_mode_id) {
419 		struct drm_property_blob *mode =
420 			drm_property_lookup_blob(dev, val);
421 		ret = drm_atomic_set_mode_prop_for_crtc(state, mode);
422 		drm_property_blob_put(mode);
423 		return ret;
424 	} else if (property == config->prop_vrr_enabled) {
425 		state->vrr_enabled = val;
426 	} else if (property == config->degamma_lut_property) {
427 		ret = drm_atomic_replace_property_blob_from_id(dev,
428 					&state->degamma_lut,
429 					val,
430 					-1, sizeof(struct drm_color_lut),
431 					&replaced);
432 		state->color_mgmt_changed |= replaced;
433 		return ret;
434 	} else if (property == config->ctm_property) {
435 		ret = drm_atomic_replace_property_blob_from_id(dev,
436 					&state->ctm,
437 					val,
438 					sizeof(struct drm_color_ctm), -1,
439 					&replaced);
440 		state->color_mgmt_changed |= replaced;
441 		return ret;
442 	} else if (property == config->gamma_lut_property) {
443 		ret = drm_atomic_replace_property_blob_from_id(dev,
444 					&state->gamma_lut,
445 					val,
446 					-1, sizeof(struct drm_color_lut),
447 					&replaced);
448 		state->color_mgmt_changed |= replaced;
449 		return ret;
450 	} else if (property == config->prop_out_fence_ptr) {
451 		s32 __user *fence_ptr = u64_to_user_ptr(val);
452 
453 		if (!fence_ptr)
454 			return 0;
455 
456 		if (put_user(-1, fence_ptr))
457 			return -EFAULT;
458 
459 		set_out_fence_for_crtc(state->state, crtc, fence_ptr);
460 	} else if (property == crtc->scaling_filter_property) {
461 		state->scaling_filter = val;
462 	} else if (crtc->funcs->atomic_set_property) {
463 		return crtc->funcs->atomic_set_property(crtc, state, property, val);
464 	} else {
465 		drm_dbg_atomic(crtc->dev,
466 			       "[CRTC:%d:%s] unknown property [PROP:%d:%s]\n",
467 			       crtc->base.id, crtc->name,
468 			       property->base.id, property->name);
469 		return -EINVAL;
470 	}
471 
472 	return 0;
473 }
474 
475 static int
476 drm_atomic_crtc_get_property(struct drm_crtc *crtc,
477 		const struct drm_crtc_state *state,
478 		struct drm_property *property, uint64_t *val)
479 {
480 	struct drm_device *dev = crtc->dev;
481 	struct drm_mode_config *config = &dev->mode_config;
482 
483 	if (property == config->prop_active)
484 		*val = drm_atomic_crtc_effectively_active(state);
485 	else if (property == config->prop_mode_id)
486 		*val = (state->mode_blob) ? state->mode_blob->base.id : 0;
487 	else if (property == config->prop_vrr_enabled)
488 		*val = state->vrr_enabled;
489 	else if (property == config->degamma_lut_property)
490 		*val = (state->degamma_lut) ? state->degamma_lut->base.id : 0;
491 	else if (property == config->ctm_property)
492 		*val = (state->ctm) ? state->ctm->base.id : 0;
493 	else if (property == config->gamma_lut_property)
494 		*val = (state->gamma_lut) ? state->gamma_lut->base.id : 0;
495 	else if (property == config->prop_out_fence_ptr)
496 		*val = 0;
497 	else if (property == crtc->scaling_filter_property)
498 		*val = state->scaling_filter;
499 	else if (crtc->funcs->atomic_get_property)
500 		return crtc->funcs->atomic_get_property(crtc, state, property, val);
501 	else {
502 		drm_dbg_atomic(dev,
503 			       "[CRTC:%d:%s] unknown property [PROP:%d:%s]\n",
504 			       crtc->base.id, crtc->name,
505 			       property->base.id, property->name);
506 		return -EINVAL;
507 	}
508 
509 	return 0;
510 }
511 
512 static int drm_atomic_plane_set_property(struct drm_plane *plane,
513 		struct drm_plane_state *state, struct drm_file *file_priv,
514 		struct drm_property *property, uint64_t val)
515 {
516 	struct drm_device *dev = plane->dev;
517 	struct drm_mode_config *config = &dev->mode_config;
518 	bool replaced = false;
519 	int ret;
520 
521 	if (property == config->prop_fb_id) {
522 		struct drm_framebuffer *fb;
523 
524 		fb = drm_framebuffer_lookup(dev, file_priv, val);
525 		drm_atomic_set_fb_for_plane(state, fb);
526 		if (fb)
527 			drm_framebuffer_put(fb);
528 	} else if (property == config->prop_in_fence_fd) {
529 		if (state->fence)
530 			return -EINVAL;
531 
532 		if (U642I64(val) == -1)
533 			return 0;
534 
535 		state->fence = sync_file_get_fence(val);
536 		if (!state->fence)
537 			return -EINVAL;
538 
539 	} else if (property == config->prop_crtc_id) {
540 		struct drm_crtc *crtc = drm_crtc_find(dev, file_priv, val);
541 
542 		if (val && !crtc) {
543 			drm_dbg_atomic(dev,
544 				       "[PROP:%d:%s] cannot find CRTC with ID %llu\n",
545 				       property->base.id, property->name, val);
546 			return -EACCES;
547 		}
548 		return drm_atomic_set_crtc_for_plane(state, crtc);
549 	} else if (property == config->prop_crtc_x) {
550 		state->crtc_x = U642I64(val);
551 	} else if (property == config->prop_crtc_y) {
552 		state->crtc_y = U642I64(val);
553 	} else if (property == config->prop_crtc_w) {
554 		state->crtc_w = val;
555 	} else if (property == config->prop_crtc_h) {
556 		state->crtc_h = val;
557 	} else if (property == config->prop_src_x) {
558 		state->src_x = val;
559 	} else if (property == config->prop_src_y) {
560 		state->src_y = val;
561 	} else if (property == config->prop_src_w) {
562 		state->src_w = val;
563 	} else if (property == config->prop_src_h) {
564 		state->src_h = val;
565 	} else if (property == plane->alpha_property) {
566 		state->alpha = val;
567 	} else if (property == plane->blend_mode_property) {
568 		state->pixel_blend_mode = val;
569 	} else if (property == plane->rotation_property) {
570 		if (!is_power_of_2(val & DRM_MODE_ROTATE_MASK)) {
571 			drm_dbg_atomic(plane->dev,
572 				       "[PLANE:%d:%s] bad rotation bitmask: 0x%llx\n",
573 				       plane->base.id, plane->name, val);
574 			return -EINVAL;
575 		}
576 		state->rotation = val;
577 	} else if (property == plane->zpos_property) {
578 		state->zpos = val;
579 	} else if (property == plane->color_encoding_property) {
580 		state->color_encoding = val;
581 	} else if (property == plane->color_range_property) {
582 		state->color_range = val;
583 	} else if (property == config->prop_fb_damage_clips) {
584 		ret = drm_atomic_replace_property_blob_from_id(dev,
585 					&state->fb_damage_clips,
586 					val,
587 					-1,
588 					sizeof(struct drm_rect),
589 					&replaced);
590 		return ret;
591 	} else if (property == plane->scaling_filter_property) {
592 		state->scaling_filter = val;
593 	} else if (plane->funcs->atomic_set_property) {
594 		return plane->funcs->atomic_set_property(plane, state,
595 				property, val);
596 	} else {
597 		drm_dbg_atomic(plane->dev,
598 			       "[PLANE:%d:%s] unknown property [PROP:%d:%s]\n",
599 			       plane->base.id, plane->name,
600 			       property->base.id, property->name);
601 		return -EINVAL;
602 	}
603 
604 	return 0;
605 }
606 
607 static int
608 drm_atomic_plane_get_property(struct drm_plane *plane,
609 		const struct drm_plane_state *state,
610 		struct drm_property *property, uint64_t *val)
611 {
612 	struct drm_device *dev = plane->dev;
613 	struct drm_mode_config *config = &dev->mode_config;
614 
615 	if (property == config->prop_fb_id) {
616 		*val = (state->fb) ? state->fb->base.id : 0;
617 	} else if (property == config->prop_in_fence_fd) {
618 		*val = -1;
619 	} else if (property == config->prop_crtc_id) {
620 		*val = (state->crtc) ? state->crtc->base.id : 0;
621 	} else if (property == config->prop_crtc_x) {
622 		*val = I642U64(state->crtc_x);
623 	} else if (property == config->prop_crtc_y) {
624 		*val = I642U64(state->crtc_y);
625 	} else if (property == config->prop_crtc_w) {
626 		*val = state->crtc_w;
627 	} else if (property == config->prop_crtc_h) {
628 		*val = state->crtc_h;
629 	} else if (property == config->prop_src_x) {
630 		*val = state->src_x;
631 	} else if (property == config->prop_src_y) {
632 		*val = state->src_y;
633 	} else if (property == config->prop_src_w) {
634 		*val = state->src_w;
635 	} else if (property == config->prop_src_h) {
636 		*val = state->src_h;
637 	} else if (property == plane->alpha_property) {
638 		*val = state->alpha;
639 	} else if (property == plane->blend_mode_property) {
640 		*val = state->pixel_blend_mode;
641 	} else if (property == plane->rotation_property) {
642 		*val = state->rotation;
643 	} else if (property == plane->zpos_property) {
644 		*val = state->zpos;
645 	} else if (property == plane->color_encoding_property) {
646 		*val = state->color_encoding;
647 	} else if (property == plane->color_range_property) {
648 		*val = state->color_range;
649 	} else if (property == config->prop_fb_damage_clips) {
650 		*val = (state->fb_damage_clips) ?
651 			state->fb_damage_clips->base.id : 0;
652 	} else if (property == plane->scaling_filter_property) {
653 		*val = state->scaling_filter;
654 	} else if (plane->funcs->atomic_get_property) {
655 		return plane->funcs->atomic_get_property(plane, state, property, val);
656 	} else {
657 		drm_dbg_atomic(dev,
658 			       "[PLANE:%d:%s] unknown property [PROP:%d:%s]\n",
659 			       plane->base.id, plane->name,
660 			       property->base.id, property->name);
661 		return -EINVAL;
662 	}
663 
664 	return 0;
665 }
666 
667 static int drm_atomic_set_writeback_fb_for_connector(
668 		struct drm_connector_state *conn_state,
669 		struct drm_framebuffer *fb)
670 {
671 	int ret;
672 	struct drm_connector *conn = conn_state->connector;
673 
674 	ret = drm_writeback_set_fb(conn_state, fb);
675 	if (ret < 0)
676 		return ret;
677 
678 	if (fb)
679 		drm_dbg_atomic(conn->dev,
680 			       "Set [FB:%d] for connector state %p\n",
681 			       fb->base.id, conn_state);
682 	else
683 		drm_dbg_atomic(conn->dev,
684 			       "Set [NOFB] for connector state %p\n",
685 			       conn_state);
686 
687 	return 0;
688 }
689 
690 static int drm_atomic_connector_set_property(struct drm_connector *connector,
691 		struct drm_connector_state *state, struct drm_file *file_priv,
692 		struct drm_property *property, uint64_t val)
693 {
694 	struct drm_device *dev = connector->dev;
695 	struct drm_mode_config *config = &dev->mode_config;
696 	bool replaced = false;
697 	int ret;
698 
699 	if (property == config->prop_crtc_id) {
700 		struct drm_crtc *crtc = drm_crtc_find(dev, file_priv, val);
701 
702 		if (val && !crtc) {
703 			drm_dbg_atomic(dev,
704 				       "[PROP:%d:%s] cannot find CRTC with ID %llu\n",
705 				       property->base.id, property->name, val);
706 			return -EACCES;
707 		}
708 		return drm_atomic_set_crtc_for_connector(state, crtc);
709 	} else if (property == config->dpms_property) {
710 		/* setting DPMS property requires special handling, which
711 		 * is done in legacy setprop path for us.  Disallow (for
712 		 * now?) atomic writes to DPMS property:
713 		 */
714 		drm_dbg_atomic(dev,
715 			       "legacy [PROP:%d:%s] can only be set via legacy uAPI\n",
716 			       property->base.id, property->name);
717 		return -EINVAL;
718 	} else if (property == config->tv_select_subconnector_property) {
719 		state->tv.select_subconnector = val;
720 	} else if (property == config->tv_subconnector_property) {
721 		state->tv.subconnector = val;
722 	} else if (property == config->tv_left_margin_property) {
723 		state->tv.margins.left = val;
724 	} else if (property == config->tv_right_margin_property) {
725 		state->tv.margins.right = val;
726 	} else if (property == config->tv_top_margin_property) {
727 		state->tv.margins.top = val;
728 	} else if (property == config->tv_bottom_margin_property) {
729 		state->tv.margins.bottom = val;
730 	} else if (property == config->legacy_tv_mode_property) {
731 		state->tv.legacy_mode = val;
732 	} else if (property == config->tv_mode_property) {
733 		state->tv.mode = val;
734 	} else if (property == config->tv_brightness_property) {
735 		state->tv.brightness = val;
736 	} else if (property == config->tv_contrast_property) {
737 		state->tv.contrast = val;
738 	} else if (property == config->tv_flicker_reduction_property) {
739 		state->tv.flicker_reduction = val;
740 	} else if (property == config->tv_overscan_property) {
741 		state->tv.overscan = val;
742 	} else if (property == config->tv_saturation_property) {
743 		state->tv.saturation = val;
744 	} else if (property == config->tv_hue_property) {
745 		state->tv.hue = val;
746 	} else if (property == config->link_status_property) {
747 		/* Never downgrade from GOOD to BAD on userspace's request here,
748 		 * only hw issues can do that.
749 		 *
750 		 * For an atomic property the userspace doesn't need to be able
751 		 * to understand all the properties, but needs to be able to
752 		 * restore the state it wants on VT switch. So if the userspace
753 		 * tries to change the link_status from GOOD to BAD, driver
754 		 * silently rejects it and returns a 0. This prevents userspace
755 		 * from accidentally breaking  the display when it restores the
756 		 * state.
757 		 */
758 		if (state->link_status != DRM_LINK_STATUS_GOOD)
759 			state->link_status = val;
760 	} else if (property == config->hdr_output_metadata_property) {
761 		ret = drm_atomic_replace_property_blob_from_id(dev,
762 				&state->hdr_output_metadata,
763 				val,
764 				sizeof(struct hdr_output_metadata), -1,
765 				&replaced);
766 		return ret;
767 	} else if (property == config->aspect_ratio_property) {
768 		state->picture_aspect_ratio = val;
769 	} else if (property == config->content_type_property) {
770 		state->content_type = val;
771 	} else if (property == connector->scaling_mode_property) {
772 		state->scaling_mode = val;
773 	} else if (property == config->content_protection_property) {
774 		if (val == DRM_MODE_CONTENT_PROTECTION_ENABLED) {
775 			drm_dbg_kms(dev, "only drivers can set CP Enabled\n");
776 			return -EINVAL;
777 		}
778 		state->content_protection = val;
779 	} else if (property == config->hdcp_content_type_property) {
780 		state->hdcp_content_type = val;
781 	} else if (property == connector->colorspace_property) {
782 		state->colorspace = val;
783 	} else if (property == config->writeback_fb_id_property) {
784 		struct drm_framebuffer *fb;
785 		int ret;
786 
787 		fb = drm_framebuffer_lookup(dev, file_priv, val);
788 		ret = drm_atomic_set_writeback_fb_for_connector(state, fb);
789 		if (fb)
790 			drm_framebuffer_put(fb);
791 		return ret;
792 	} else if (property == config->writeback_out_fence_ptr_property) {
793 		s32 __user *fence_ptr = u64_to_user_ptr(val);
794 
795 		return set_out_fence_for_connector(state->state, connector,
796 						   fence_ptr);
797 	} else if (property == connector->max_bpc_property) {
798 		state->max_requested_bpc = val;
799 	} else if (property == connector->privacy_screen_sw_state_property) {
800 		state->privacy_screen_sw_state = val;
801 	} else if (connector->funcs->atomic_set_property) {
802 		return connector->funcs->atomic_set_property(connector,
803 				state, property, val);
804 	} else {
805 		drm_dbg_atomic(connector->dev,
806 			       "[CONNECTOR:%d:%s] unknown property [PROP:%d:%s]\n",
807 			       connector->base.id, connector->name,
808 			       property->base.id, property->name);
809 		return -EINVAL;
810 	}
811 
812 	return 0;
813 }
814 
815 static int
816 drm_atomic_connector_get_property(struct drm_connector *connector,
817 		const struct drm_connector_state *state,
818 		struct drm_property *property, uint64_t *val)
819 {
820 	struct drm_device *dev = connector->dev;
821 	struct drm_mode_config *config = &dev->mode_config;
822 
823 	if (property == config->prop_crtc_id) {
824 		*val = (state->crtc) ? state->crtc->base.id : 0;
825 	} else if (property == config->dpms_property) {
826 		if (state->crtc && state->crtc->state->self_refresh_active)
827 			*val = DRM_MODE_DPMS_ON;
828 		else
829 			*val = connector->dpms;
830 	} else if (property == config->tv_select_subconnector_property) {
831 		*val = state->tv.select_subconnector;
832 	} else if (property == config->tv_subconnector_property) {
833 		*val = state->tv.subconnector;
834 	} else if (property == config->tv_left_margin_property) {
835 		*val = state->tv.margins.left;
836 	} else if (property == config->tv_right_margin_property) {
837 		*val = state->tv.margins.right;
838 	} else if (property == config->tv_top_margin_property) {
839 		*val = state->tv.margins.top;
840 	} else if (property == config->tv_bottom_margin_property) {
841 		*val = state->tv.margins.bottom;
842 	} else if (property == config->legacy_tv_mode_property) {
843 		*val = state->tv.legacy_mode;
844 	} else if (property == config->tv_mode_property) {
845 		*val = state->tv.mode;
846 	} else if (property == config->tv_brightness_property) {
847 		*val = state->tv.brightness;
848 	} else if (property == config->tv_contrast_property) {
849 		*val = state->tv.contrast;
850 	} else if (property == config->tv_flicker_reduction_property) {
851 		*val = state->tv.flicker_reduction;
852 	} else if (property == config->tv_overscan_property) {
853 		*val = state->tv.overscan;
854 	} else if (property == config->tv_saturation_property) {
855 		*val = state->tv.saturation;
856 	} else if (property == config->tv_hue_property) {
857 		*val = state->tv.hue;
858 	} else if (property == config->link_status_property) {
859 		*val = state->link_status;
860 	} else if (property == config->aspect_ratio_property) {
861 		*val = state->picture_aspect_ratio;
862 	} else if (property == config->content_type_property) {
863 		*val = state->content_type;
864 	} else if (property == connector->colorspace_property) {
865 		*val = state->colorspace;
866 	} else if (property == connector->scaling_mode_property) {
867 		*val = state->scaling_mode;
868 	} else if (property == config->hdr_output_metadata_property) {
869 		*val = state->hdr_output_metadata ?
870 			state->hdr_output_metadata->base.id : 0;
871 	} else if (property == config->content_protection_property) {
872 		*val = state->content_protection;
873 	} else if (property == config->hdcp_content_type_property) {
874 		*val = state->hdcp_content_type;
875 	} else if (property == config->writeback_fb_id_property) {
876 		/* Writeback framebuffer is one-shot, write and forget */
877 		*val = 0;
878 	} else if (property == config->writeback_out_fence_ptr_property) {
879 		*val = 0;
880 	} else if (property == connector->max_bpc_property) {
881 		*val = state->max_requested_bpc;
882 	} else if (property == connector->privacy_screen_sw_state_property) {
883 		*val = state->privacy_screen_sw_state;
884 	} else if (connector->funcs->atomic_get_property) {
885 		return connector->funcs->atomic_get_property(connector,
886 				state, property, val);
887 	} else {
888 		drm_dbg_atomic(dev,
889 			       "[CONNECTOR:%d:%s] unknown property [PROP:%d:%s]\n",
890 			       connector->base.id, connector->name,
891 			       property->base.id, property->name);
892 		return -EINVAL;
893 	}
894 
895 	return 0;
896 }
897 
898 int drm_atomic_get_property(struct drm_mode_object *obj,
899 		struct drm_property *property, uint64_t *val)
900 {
901 	struct drm_device *dev = property->dev;
902 	int ret;
903 
904 	switch (obj->type) {
905 	case DRM_MODE_OBJECT_CONNECTOR: {
906 		struct drm_connector *connector = obj_to_connector(obj);
907 
908 		WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
909 		ret = drm_atomic_connector_get_property(connector,
910 				connector->state, property, val);
911 		break;
912 	}
913 	case DRM_MODE_OBJECT_CRTC: {
914 		struct drm_crtc *crtc = obj_to_crtc(obj);
915 
916 		WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
917 		ret = drm_atomic_crtc_get_property(crtc,
918 				crtc->state, property, val);
919 		break;
920 	}
921 	case DRM_MODE_OBJECT_PLANE: {
922 		struct drm_plane *plane = obj_to_plane(obj);
923 
924 		WARN_ON(!drm_modeset_is_locked(&plane->mutex));
925 		ret = drm_atomic_plane_get_property(plane,
926 				plane->state, property, val);
927 		break;
928 	}
929 	default:
930 		drm_dbg_atomic(dev, "[OBJECT:%d] has no properties\n", obj->id);
931 		ret = -EINVAL;
932 		break;
933 	}
934 
935 	return ret;
936 }
937 
938 /*
939  * The big monster ioctl
940  */
941 
942 static struct drm_pending_vblank_event *create_vblank_event(
943 		struct drm_crtc *crtc, uint64_t user_data)
944 {
945 	struct drm_pending_vblank_event *e = NULL;
946 
947 	e = kzalloc(sizeof *e, GFP_KERNEL);
948 	if (!e)
949 		return NULL;
950 
951 	e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
952 	e->event.base.length = sizeof(e->event);
953 	e->event.vbl.crtc_id = crtc->base.id;
954 	e->event.vbl.user_data = user_data;
955 
956 	return e;
957 }
958 
959 int drm_atomic_connector_commit_dpms(struct drm_atomic_state *state,
960 				     struct drm_connector *connector,
961 				     int mode)
962 {
963 	struct drm_connector *tmp_connector;
964 	struct drm_connector_state *new_conn_state;
965 	struct drm_crtc *crtc;
966 	struct drm_crtc_state *crtc_state;
967 	int i, ret, old_mode = connector->dpms;
968 	bool active = false;
969 
970 	ret = drm_modeset_lock(&state->dev->mode_config.connection_mutex,
971 			       state->acquire_ctx);
972 	if (ret)
973 		return ret;
974 
975 	if (mode != DRM_MODE_DPMS_ON)
976 		mode = DRM_MODE_DPMS_OFF;
977 	connector->dpms = mode;
978 
979 	crtc = connector->state->crtc;
980 	if (!crtc)
981 		goto out;
982 	ret = drm_atomic_add_affected_connectors(state, crtc);
983 	if (ret)
984 		goto out;
985 
986 	crtc_state = drm_atomic_get_crtc_state(state, crtc);
987 	if (IS_ERR(crtc_state)) {
988 		ret = PTR_ERR(crtc_state);
989 		goto out;
990 	}
991 
992 	for_each_new_connector_in_state(state, tmp_connector, new_conn_state, i) {
993 		if (new_conn_state->crtc != crtc)
994 			continue;
995 		if (tmp_connector->dpms == DRM_MODE_DPMS_ON) {
996 			active = true;
997 			break;
998 		}
999 	}
1000 
1001 	crtc_state->active = active;
1002 	ret = drm_atomic_commit(state);
1003 out:
1004 	if (ret != 0)
1005 		connector->dpms = old_mode;
1006 	return ret;
1007 }
1008 
1009 int drm_atomic_set_property(struct drm_atomic_state *state,
1010 			    struct drm_file *file_priv,
1011 			    struct drm_mode_object *obj,
1012 			    struct drm_property *prop,
1013 			    uint64_t prop_value)
1014 {
1015 	struct drm_mode_object *ref;
1016 	int ret;
1017 
1018 	if (!drm_property_change_valid_get(prop, prop_value, &ref))
1019 		return -EINVAL;
1020 
1021 	switch (obj->type) {
1022 	case DRM_MODE_OBJECT_CONNECTOR: {
1023 		struct drm_connector *connector = obj_to_connector(obj);
1024 		struct drm_connector_state *connector_state;
1025 
1026 		connector_state = drm_atomic_get_connector_state(state, connector);
1027 		if (IS_ERR(connector_state)) {
1028 			ret = PTR_ERR(connector_state);
1029 			break;
1030 		}
1031 
1032 		ret = drm_atomic_connector_set_property(connector,
1033 				connector_state, file_priv,
1034 				prop, prop_value);
1035 		break;
1036 	}
1037 	case DRM_MODE_OBJECT_CRTC: {
1038 		struct drm_crtc *crtc = obj_to_crtc(obj);
1039 		struct drm_crtc_state *crtc_state;
1040 
1041 		crtc_state = drm_atomic_get_crtc_state(state, crtc);
1042 		if (IS_ERR(crtc_state)) {
1043 			ret = PTR_ERR(crtc_state);
1044 			break;
1045 		}
1046 
1047 		ret = drm_atomic_crtc_set_property(crtc,
1048 				crtc_state, prop, prop_value);
1049 		break;
1050 	}
1051 	case DRM_MODE_OBJECT_PLANE: {
1052 		struct drm_plane *plane = obj_to_plane(obj);
1053 		struct drm_plane_state *plane_state;
1054 
1055 		plane_state = drm_atomic_get_plane_state(state, plane);
1056 		if (IS_ERR(plane_state)) {
1057 			ret = PTR_ERR(plane_state);
1058 			break;
1059 		}
1060 
1061 		ret = drm_atomic_plane_set_property(plane,
1062 				plane_state, file_priv,
1063 				prop, prop_value);
1064 		break;
1065 	}
1066 	default:
1067 		drm_dbg_atomic(prop->dev, "[OBJECT:%d] has no properties\n", obj->id);
1068 		ret = -EINVAL;
1069 		break;
1070 	}
1071 
1072 	drm_property_change_valid_put(prop, ref);
1073 	return ret;
1074 }
1075 
1076 /**
1077  * DOC: explicit fencing properties
1078  *
1079  * Explicit fencing allows userspace to control the buffer synchronization
1080  * between devices. A Fence or a group of fences are transferred to/from
1081  * userspace using Sync File fds and there are two DRM properties for that.
1082  * IN_FENCE_FD on each DRM Plane to send fences to the kernel and
1083  * OUT_FENCE_PTR on each DRM CRTC to receive fences from the kernel.
1084  *
1085  * As a contrast, with implicit fencing the kernel keeps track of any
1086  * ongoing rendering, and automatically ensures that the atomic update waits
1087  * for any pending rendering to complete. This is usually tracked in &struct
1088  * dma_resv which can also contain mandatory kernel fences. Implicit syncing
1089  * is how Linux traditionally worked (e.g. DRI2/3 on X.org), whereas explicit
1090  * fencing is what Android wants.
1091  *
1092  * "IN_FENCE_FD”:
1093  *	Use this property to pass a fence that DRM should wait on before
1094  *	proceeding with the Atomic Commit request and show the framebuffer for
1095  *	the plane on the screen. The fence can be either a normal fence or a
1096  *	merged one, the sync_file framework will handle both cases and use a
1097  *	fence_array if a merged fence is received. Passing -1 here means no
1098  *	fences to wait on.
1099  *
1100  *	If the Atomic Commit request has the DRM_MODE_ATOMIC_TEST_ONLY flag
1101  *	it will only check if the Sync File is a valid one.
1102  *
1103  *	On the driver side the fence is stored on the @fence parameter of
1104  *	&struct drm_plane_state. Drivers which also support implicit fencing
1105  *	should extract the implicit fence using drm_gem_plane_helper_prepare_fb(),
1106  *	to make sure there's consistent behaviour between drivers in precedence
1107  *	of implicit vs. explicit fencing.
1108  *
1109  * "OUT_FENCE_PTR”:
1110  *	Use this property to pass a file descriptor pointer to DRM. Once the
1111  *	Atomic Commit request call returns OUT_FENCE_PTR will be filled with
1112  *	the file descriptor number of a Sync File. This Sync File contains the
1113  *	CRTC fence that will be signaled when all framebuffers present on the
1114  *	Atomic Commit * request for that given CRTC are scanned out on the
1115  *	screen.
1116  *
1117  *	The Atomic Commit request fails if a invalid pointer is passed. If the
1118  *	Atomic Commit request fails for any other reason the out fence fd
1119  *	returned will be -1. On a Atomic Commit with the
1120  *	DRM_MODE_ATOMIC_TEST_ONLY flag the out fence will also be set to -1.
1121  *
1122  *	Note that out-fences don't have a special interface to drivers and are
1123  *	internally represented by a &struct drm_pending_vblank_event in struct
1124  *	&drm_crtc_state, which is also used by the nonblocking atomic commit
1125  *	helpers and for the DRM event handling for existing userspace.
1126  */
1127 
1128 struct drm_out_fence_state {
1129 	s32 __user *out_fence_ptr;
1130 	struct sync_file *sync_file;
1131 	int fd;
1132 };
1133 
1134 static int setup_out_fence(struct drm_out_fence_state *fence_state,
1135 			   struct dma_fence *fence)
1136 {
1137 	fence_state->fd = get_unused_fd_flags(O_CLOEXEC);
1138 	if (fence_state->fd < 0)
1139 		return fence_state->fd;
1140 
1141 	if (put_user(fence_state->fd, fence_state->out_fence_ptr))
1142 		return -EFAULT;
1143 
1144 	fence_state->sync_file = sync_file_create(fence);
1145 	if (!fence_state->sync_file)
1146 		return -ENOMEM;
1147 
1148 	return 0;
1149 }
1150 
1151 static int prepare_signaling(struct drm_device *dev,
1152 				  struct drm_atomic_state *state,
1153 				  struct drm_mode_atomic *arg,
1154 				  struct drm_file *file_priv,
1155 				  struct drm_out_fence_state **fence_state,
1156 				  unsigned int *num_fences)
1157 {
1158 	struct drm_crtc *crtc;
1159 	struct drm_crtc_state *crtc_state;
1160 	struct drm_connector *conn;
1161 	struct drm_connector_state *conn_state;
1162 	int i, c = 0, ret;
1163 
1164 	if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)
1165 		return 0;
1166 
1167 	for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1168 		s32 __user *fence_ptr;
1169 
1170 		fence_ptr = get_out_fence_for_crtc(crtc_state->state, crtc);
1171 
1172 		if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT || fence_ptr) {
1173 			struct drm_pending_vblank_event *e;
1174 
1175 			e = create_vblank_event(crtc, arg->user_data);
1176 			if (!e)
1177 				return -ENOMEM;
1178 
1179 			crtc_state->event = e;
1180 		}
1181 
1182 		if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
1183 			struct drm_pending_vblank_event *e = crtc_state->event;
1184 
1185 			if (!file_priv)
1186 				continue;
1187 
1188 			ret = drm_event_reserve_init(dev, file_priv, &e->base,
1189 						     &e->event.base);
1190 			if (ret) {
1191 				kfree(e);
1192 				crtc_state->event = NULL;
1193 				return ret;
1194 			}
1195 		}
1196 
1197 		if (fence_ptr) {
1198 			struct dma_fence *fence;
1199 			struct drm_out_fence_state *f;
1200 
1201 			f = krealloc(*fence_state, sizeof(**fence_state) *
1202 				     (*num_fences + 1), GFP_KERNEL);
1203 			if (!f)
1204 				return -ENOMEM;
1205 
1206 			memset(&f[*num_fences], 0, sizeof(*f));
1207 
1208 			f[*num_fences].out_fence_ptr = fence_ptr;
1209 			*fence_state = f;
1210 
1211 			fence = drm_crtc_create_fence(crtc);
1212 			if (!fence)
1213 				return -ENOMEM;
1214 
1215 			ret = setup_out_fence(&f[(*num_fences)++], fence);
1216 			if (ret) {
1217 				dma_fence_put(fence);
1218 				return ret;
1219 			}
1220 
1221 			crtc_state->event->base.fence = fence;
1222 		}
1223 
1224 		c++;
1225 	}
1226 
1227 	for_each_new_connector_in_state(state, conn, conn_state, i) {
1228 		struct drm_writeback_connector *wb_conn;
1229 		struct drm_out_fence_state *f;
1230 		struct dma_fence *fence;
1231 		s32 __user *fence_ptr;
1232 
1233 		if (!conn_state->writeback_job)
1234 			continue;
1235 
1236 		fence_ptr = get_out_fence_for_connector(state, conn);
1237 		if (!fence_ptr)
1238 			continue;
1239 
1240 		f = krealloc(*fence_state, sizeof(**fence_state) *
1241 			     (*num_fences + 1), GFP_KERNEL);
1242 		if (!f)
1243 			return -ENOMEM;
1244 
1245 		memset(&f[*num_fences], 0, sizeof(*f));
1246 
1247 		f[*num_fences].out_fence_ptr = fence_ptr;
1248 		*fence_state = f;
1249 
1250 		wb_conn = drm_connector_to_writeback(conn);
1251 		fence = drm_writeback_get_out_fence(wb_conn);
1252 		if (!fence)
1253 			return -ENOMEM;
1254 
1255 		ret = setup_out_fence(&f[(*num_fences)++], fence);
1256 		if (ret) {
1257 			dma_fence_put(fence);
1258 			return ret;
1259 		}
1260 
1261 		conn_state->writeback_job->out_fence = fence;
1262 	}
1263 
1264 	/*
1265 	 * Having this flag means user mode pends on event which will never
1266 	 * reach due to lack of at least one CRTC for signaling
1267 	 */
1268 	if (c == 0 && (arg->flags & DRM_MODE_PAGE_FLIP_EVENT)) {
1269 		drm_dbg_atomic(dev, "need at least one CRTC for DRM_MODE_PAGE_FLIP_EVENT");
1270 		return -EINVAL;
1271 	}
1272 
1273 	return 0;
1274 }
1275 
1276 static void complete_signaling(struct drm_device *dev,
1277 			       struct drm_atomic_state *state,
1278 			       struct drm_out_fence_state *fence_state,
1279 			       unsigned int num_fences,
1280 			       bool install_fds)
1281 {
1282 	struct drm_crtc *crtc;
1283 	struct drm_crtc_state *crtc_state;
1284 	int i;
1285 
1286 	if (install_fds) {
1287 		for (i = 0; i < num_fences; i++)
1288 			fd_install(fence_state[i].fd,
1289 				   fence_state[i].sync_file->file);
1290 
1291 		kfree(fence_state);
1292 		return;
1293 	}
1294 
1295 	for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1296 		struct drm_pending_vblank_event *event = crtc_state->event;
1297 		/*
1298 		 * Free the allocated event. drm_atomic_helper_setup_commit
1299 		 * can allocate an event too, so only free it if it's ours
1300 		 * to prevent a double free in drm_atomic_state_clear.
1301 		 */
1302 		if (event && (event->base.fence || event->base.file_priv)) {
1303 			drm_event_cancel_free(dev, &event->base);
1304 			crtc_state->event = NULL;
1305 		}
1306 	}
1307 
1308 	if (!fence_state)
1309 		return;
1310 
1311 	for (i = 0; i < num_fences; i++) {
1312 		if (fence_state[i].sync_file)
1313 			fput(fence_state[i].sync_file->file);
1314 		if (fence_state[i].fd >= 0)
1315 			put_unused_fd(fence_state[i].fd);
1316 
1317 		/* If this fails log error to the user */
1318 		if (fence_state[i].out_fence_ptr &&
1319 		    put_user(-1, fence_state[i].out_fence_ptr))
1320 			drm_dbg_atomic(dev, "Couldn't clear out_fence_ptr\n");
1321 	}
1322 
1323 	kfree(fence_state);
1324 }
1325 
1326 int drm_mode_atomic_ioctl(struct drm_device *dev,
1327 			  void *data, struct drm_file *file_priv)
1328 {
1329 	struct drm_mode_atomic *arg = data;
1330 	uint32_t __user *objs_ptr = (uint32_t __user *)(unsigned long)(arg->objs_ptr);
1331 	uint32_t __user *count_props_ptr = (uint32_t __user *)(unsigned long)(arg->count_props_ptr);
1332 	uint32_t __user *props_ptr = (uint32_t __user *)(unsigned long)(arg->props_ptr);
1333 	uint64_t __user *prop_values_ptr = (uint64_t __user *)(unsigned long)(arg->prop_values_ptr);
1334 	unsigned int copied_objs, copied_props;
1335 	struct drm_atomic_state *state;
1336 	struct drm_modeset_acquire_ctx ctx;
1337 	struct drm_out_fence_state *fence_state;
1338 	int ret = 0;
1339 	unsigned int i, j, num_fences;
1340 
1341 	/* disallow for drivers not supporting atomic: */
1342 	if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
1343 		return -EOPNOTSUPP;
1344 
1345 	/* disallow for userspace that has not enabled atomic cap (even
1346 	 * though this may be a bit overkill, since legacy userspace
1347 	 * wouldn't know how to call this ioctl)
1348 	 */
1349 	if (!file_priv->atomic) {
1350 		drm_dbg_atomic(dev,
1351 			       "commit failed: atomic cap not enabled\n");
1352 		return -EINVAL;
1353 	}
1354 
1355 	if (arg->flags & ~DRM_MODE_ATOMIC_FLAGS) {
1356 		drm_dbg_atomic(dev, "commit failed: invalid flag\n");
1357 		return -EINVAL;
1358 	}
1359 
1360 	if (arg->reserved) {
1361 		drm_dbg_atomic(dev, "commit failed: reserved field set\n");
1362 		return -EINVAL;
1363 	}
1364 
1365 	if (arg->flags & DRM_MODE_PAGE_FLIP_ASYNC) {
1366 		drm_dbg_atomic(dev,
1367 			       "commit failed: invalid flag DRM_MODE_PAGE_FLIP_ASYNC\n");
1368 		return -EINVAL;
1369 	}
1370 
1371 	/* can't test and expect an event at the same time. */
1372 	if ((arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) &&
1373 			(arg->flags & DRM_MODE_PAGE_FLIP_EVENT)) {
1374 		drm_dbg_atomic(dev,
1375 			       "commit failed: page-flip event requested with test-only commit\n");
1376 		return -EINVAL;
1377 	}
1378 
1379 	state = drm_atomic_state_alloc(dev);
1380 	if (!state)
1381 		return -ENOMEM;
1382 
1383 	drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
1384 	state->acquire_ctx = &ctx;
1385 	state->allow_modeset = !!(arg->flags & DRM_MODE_ATOMIC_ALLOW_MODESET);
1386 
1387 retry:
1388 	copied_objs = 0;
1389 	copied_props = 0;
1390 	fence_state = NULL;
1391 	num_fences = 0;
1392 
1393 	for (i = 0; i < arg->count_objs; i++) {
1394 		uint32_t obj_id, count_props;
1395 		struct drm_mode_object *obj;
1396 
1397 		if (get_user(obj_id, objs_ptr + copied_objs)) {
1398 			ret = -EFAULT;
1399 			goto out;
1400 		}
1401 
1402 		obj = drm_mode_object_find(dev, file_priv, obj_id, DRM_MODE_OBJECT_ANY);
1403 		if (!obj) {
1404 			drm_dbg_atomic(dev, "cannot find object ID %d", obj_id);
1405 			ret = -ENOENT;
1406 			goto out;
1407 		}
1408 
1409 		if (!obj->properties) {
1410 			drm_dbg_atomic(dev, "[OBJECT:%d] has no properties", obj_id);
1411 			drm_mode_object_put(obj);
1412 			ret = -ENOENT;
1413 			goto out;
1414 		}
1415 
1416 		if (get_user(count_props, count_props_ptr + copied_objs)) {
1417 			drm_mode_object_put(obj);
1418 			ret = -EFAULT;
1419 			goto out;
1420 		}
1421 
1422 		copied_objs++;
1423 
1424 		for (j = 0; j < count_props; j++) {
1425 			uint32_t prop_id;
1426 			uint64_t prop_value;
1427 			struct drm_property *prop;
1428 
1429 			if (get_user(prop_id, props_ptr + copied_props)) {
1430 				drm_mode_object_put(obj);
1431 				ret = -EFAULT;
1432 				goto out;
1433 			}
1434 
1435 			prop = drm_mode_obj_find_prop_id(obj, prop_id);
1436 			if (!prop) {
1437 				drm_dbg_atomic(dev,
1438 					       "[OBJECT:%d] cannot find property ID %d",
1439 					       obj_id, prop_id);
1440 				drm_mode_object_put(obj);
1441 				ret = -ENOENT;
1442 				goto out;
1443 			}
1444 
1445 			if (copy_from_user(&prop_value,
1446 					   prop_values_ptr + copied_props,
1447 					   sizeof(prop_value))) {
1448 				drm_mode_object_put(obj);
1449 				ret = -EFAULT;
1450 				goto out;
1451 			}
1452 
1453 			ret = drm_atomic_set_property(state, file_priv,
1454 						      obj, prop, prop_value);
1455 			if (ret) {
1456 				drm_mode_object_put(obj);
1457 				goto out;
1458 			}
1459 
1460 			copied_props++;
1461 		}
1462 
1463 		drm_mode_object_put(obj);
1464 	}
1465 
1466 	ret = prepare_signaling(dev, state, arg, file_priv, &fence_state,
1467 				&num_fences);
1468 	if (ret)
1469 		goto out;
1470 
1471 	if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) {
1472 		ret = drm_atomic_check_only(state);
1473 	} else if (arg->flags & DRM_MODE_ATOMIC_NONBLOCK) {
1474 		ret = drm_atomic_nonblocking_commit(state);
1475 	} else {
1476 		ret = drm_atomic_commit(state);
1477 	}
1478 
1479 out:
1480 	complete_signaling(dev, state, fence_state, num_fences, !ret);
1481 
1482 	if (ret == -EDEADLK) {
1483 		drm_atomic_state_clear(state);
1484 		ret = drm_modeset_backoff(&ctx);
1485 		if (!ret)
1486 			goto retry;
1487 	}
1488 
1489 	drm_atomic_state_put(state);
1490 
1491 	drm_modeset_drop_locks(&ctx);
1492 	drm_modeset_acquire_fini(&ctx);
1493 
1494 	return ret;
1495 }
1496