428d82662dc41ede2597b133d0f3033acd8e637d
[sfrench/cifs-2.6.git] / drivers / gpu / drm / drm_atomic_uapi.c
1 /*
2  * Copyright (C) 2014 Red Hat
3  * Copyright (C) 2014 Intel Corp.
4  * Copyright (C) 2018 Intel Corp.
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a
7  * copy of this software and associated documentation files (the "Software"),
8  * to deal in the Software without restriction, including without limitation
9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10  * and/or sell copies of the Software, and to permit persons to whom the
11  * Software is furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22  * OTHER DEALINGS IN THE SOFTWARE.
23  *
24  * Authors:
25  * Rob Clark <robdclark@gmail.com>
26  * Daniel Vetter <daniel.vetter@ffwll.ch>
27  */
28
29 #include <drm/drm_atomic_uapi.h>
30 #include <drm/drm_atomic.h>
31 #include <drm/drm_print.h>
32 #include <drm/drm_drv.h>
33 #include <drm/drm_writeback.h>
34 #include <drm/drm_vblank.h>
35
36 #include <linux/dma-fence.h>
37 #include <linux/uaccess.h>
38 #include <linux/sync_file.h>
39 #include <linux/file.h>
40
41 #include "drm_crtc_internal.h"
42
43 /**
44  * DOC: overview
45  *
46  * This file contains the marshalling and demarshalling glue for the atomic UAPI
47  * in all its forms: The monster ATOMIC IOCTL itself, code for GET_PROPERTY and
48  * SET_PROPERTY IOCTLs. Plus interface functions for compatibility helpers and
49  * drivers which have special needs to construct their own atomic updates, e.g.
50  * for load detect or similiar.
51  */
52
53 /**
54  * drm_atomic_set_mode_for_crtc - set mode for CRTC
55  * @state: the CRTC whose incoming state to update
56  * @mode: kernel-internal mode to use for the CRTC, or NULL to disable
57  *
58  * Set a mode (originating from the kernel) on the desired CRTC state and update
59  * the enable property.
60  *
61  * RETURNS:
62  * Zero on success, error code on failure. Cannot return -EDEADLK.
63  */
64 int drm_atomic_set_mode_for_crtc(struct drm_crtc_state *state,
65                                  const struct drm_display_mode *mode)
66 {
67         struct drm_crtc *crtc = state->crtc;
68         struct drm_mode_modeinfo umode;
69
70         /* Early return for no change. */
71         if (mode && memcmp(&state->mode, mode, sizeof(*mode)) == 0)
72                 return 0;
73
74         drm_property_blob_put(state->mode_blob);
75         state->mode_blob = NULL;
76
77         if (mode) {
78                 drm_mode_convert_to_umode(&umode, mode);
79                 state->mode_blob =
80                         drm_property_create_blob(state->crtc->dev,
81                                                  sizeof(umode),
82                                                  &umode);
83                 if (IS_ERR(state->mode_blob))
84                         return PTR_ERR(state->mode_blob);
85
86                 drm_mode_copy(&state->mode, mode);
87                 state->enable = true;
88                 DRM_DEBUG_ATOMIC("Set [MODE:%s] for [CRTC:%d:%s] state %p\n",
89                                  mode->name, crtc->base.id, crtc->name, state);
90         } else {
91                 memset(&state->mode, 0, sizeof(state->mode));
92                 state->enable = false;
93                 DRM_DEBUG_ATOMIC("Set [NOMODE] for [CRTC:%d:%s] state %p\n",
94                                  crtc->base.id, crtc->name, state);
95         }
96
97         return 0;
98 }
99 EXPORT_SYMBOL(drm_atomic_set_mode_for_crtc);
100
101 /**
102  * drm_atomic_set_mode_prop_for_crtc - set mode for CRTC
103  * @state: the CRTC whose incoming state to update
104  * @blob: pointer to blob property to use for mode
105  *
106  * Set a mode (originating from a blob property) on the desired CRTC state.
107  * This function will take a reference on the blob property for the CRTC state,
108  * and release the reference held on the state's existing mode property, if any
109  * was set.
110  *
111  * RETURNS:
112  * Zero on success, error code on failure. Cannot return -EDEADLK.
113  */
114 int drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state *state,
115                                       struct drm_property_blob *blob)
116 {
117         struct drm_crtc *crtc = state->crtc;
118
119         if (blob == state->mode_blob)
120                 return 0;
121
122         drm_property_blob_put(state->mode_blob);
123         state->mode_blob = NULL;
124
125         memset(&state->mode, 0, sizeof(state->mode));
126
127         if (blob) {
128                 int ret;
129
130                 if (blob->length != sizeof(struct drm_mode_modeinfo)) {
131                         DRM_DEBUG_ATOMIC("[CRTC:%d:%s] bad mode blob length: %zu\n",
132                                          crtc->base.id, crtc->name,
133                                          blob->length);
134                         return -EINVAL;
135                 }
136
137                 ret = drm_mode_convert_umode(crtc->dev,
138                                              &state->mode, blob->data);
139                 if (ret) {
140                         DRM_DEBUG_ATOMIC("[CRTC:%d:%s] invalid mode (ret=%d, status=%s):\n",
141                                          crtc->base.id, crtc->name,
142                                          ret, drm_get_mode_status_name(state->mode.status));
143                         drm_mode_debug_printmodeline(&state->mode);
144                         return -EINVAL;
145                 }
146
147                 state->mode_blob = drm_property_blob_get(blob);
148                 state->enable = true;
149                 DRM_DEBUG_ATOMIC("Set [MODE:%s] for [CRTC:%d:%s] state %p\n",
150                                  state->mode.name, crtc->base.id, crtc->name,
151                                  state);
152         } else {
153                 state->enable = false;
154                 DRM_DEBUG_ATOMIC("Set [NOMODE] for [CRTC:%d:%s] state %p\n",
155                                  crtc->base.id, crtc->name, state);
156         }
157
158         return 0;
159 }
160 EXPORT_SYMBOL(drm_atomic_set_mode_prop_for_crtc);
161
162 /**
163  * drm_atomic_set_crtc_for_plane - set crtc for plane
164  * @plane_state: the plane whose incoming state to update
165  * @crtc: crtc to use for the plane
166  *
167  * Changing the assigned crtc for a plane requires us to grab the lock and state
168  * for the new crtc, as needed. This function takes care of all these details
169  * besides updating the pointer in the state object itself.
170  *
171  * Returns:
172  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
173  * then the w/w mutex code has detected a deadlock and the entire atomic
174  * sequence must be restarted. All other errors are fatal.
175  */
176 int
177 drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state,
178                               struct drm_crtc *crtc)
179 {
180         struct drm_plane *plane = plane_state->plane;
181         struct drm_crtc_state *crtc_state;
182         /* Nothing to do for same crtc*/
183         if (plane_state->crtc == crtc)
184                 return 0;
185         if (plane_state->crtc) {
186                 crtc_state = drm_atomic_get_crtc_state(plane_state->state,
187                                                        plane_state->crtc);
188                 if (WARN_ON(IS_ERR(crtc_state)))
189                         return PTR_ERR(crtc_state);
190
191                 crtc_state->plane_mask &= ~drm_plane_mask(plane);
192         }
193
194         plane_state->crtc = crtc;
195
196         if (crtc) {
197                 crtc_state = drm_atomic_get_crtc_state(plane_state->state,
198                                                        crtc);
199                 if (IS_ERR(crtc_state))
200                         return PTR_ERR(crtc_state);
201                 crtc_state->plane_mask |= drm_plane_mask(plane);
202         }
203
204         if (crtc)
205                 DRM_DEBUG_ATOMIC("Link [PLANE:%d:%s] state %p to [CRTC:%d:%s]\n",
206                                  plane->base.id, plane->name, plane_state,
207                                  crtc->base.id, crtc->name);
208         else
209                 DRM_DEBUG_ATOMIC("Link [PLANE:%d:%s] state %p to [NOCRTC]\n",
210                                  plane->base.id, plane->name, plane_state);
211
212         return 0;
213 }
214 EXPORT_SYMBOL(drm_atomic_set_crtc_for_plane);
215
216 /**
217  * drm_atomic_set_fb_for_plane - set framebuffer for plane
218  * @plane_state: atomic state object for the plane
219  * @fb: fb to use for the plane
220  *
221  * Changing the assigned framebuffer for a plane requires us to grab a reference
222  * to the new fb and drop the reference to the old fb, if there is one. This
223  * function takes care of all these details besides updating the pointer in the
224  * state object itself.
225  */
226 void
227 drm_atomic_set_fb_for_plane(struct drm_plane_state *plane_state,
228                             struct drm_framebuffer *fb)
229 {
230         struct drm_plane *plane = plane_state->plane;
231
232         if (fb)
233                 DRM_DEBUG_ATOMIC("Set [FB:%d] for [PLANE:%d:%s] state %p\n",
234                                  fb->base.id, plane->base.id, plane->name,
235                                  plane_state);
236         else
237                 DRM_DEBUG_ATOMIC("Set [NOFB] for [PLANE:%d:%s] state %p\n",
238                                  plane->base.id, plane->name, plane_state);
239
240         drm_framebuffer_assign(&plane_state->fb, fb);
241 }
242 EXPORT_SYMBOL(drm_atomic_set_fb_for_plane);
243
244 /**
245  * drm_atomic_set_fence_for_plane - set fence for plane
246  * @plane_state: atomic state object for the plane
247  * @fence: dma_fence to use for the plane
248  *
249  * Helper to setup the plane_state fence in case it is not set yet.
250  * By using this drivers doesn't need to worry if the user choose
251  * implicit or explicit fencing.
252  *
253  * This function will not set the fence to the state if it was set
254  * via explicit fencing interfaces on the atomic ioctl. In that case it will
255  * drop the reference to the fence as we are not storing it anywhere.
256  * Otherwise, if &drm_plane_state.fence is not set this function we just set it
257  * with the received implicit fence. In both cases this function consumes a
258  * reference for @fence.
259  *
260  * This way explicit fencing can be used to overrule implicit fencing, which is
261  * important to make explicit fencing use-cases work: One example is using one
262  * buffer for 2 screens with different refresh rates. Implicit fencing will
263  * clamp rendering to the refresh rate of the slower screen, whereas explicit
264  * fence allows 2 independent render and display loops on a single buffer. If a
265  * driver allows obeys both implicit and explicit fences for plane updates, then
266  * it will break all the benefits of explicit fencing.
267  */
268 void
269 drm_atomic_set_fence_for_plane(struct drm_plane_state *plane_state,
270                                struct dma_fence *fence)
271 {
272         if (plane_state->fence) {
273                 dma_fence_put(fence);
274                 return;
275         }
276
277         plane_state->fence = fence;
278 }
279 EXPORT_SYMBOL(drm_atomic_set_fence_for_plane);
280
281 /**
282  * drm_atomic_set_crtc_for_connector - set crtc for connector
283  * @conn_state: atomic state object for the connector
284  * @crtc: crtc to use for the connector
285  *
286  * Changing the assigned crtc for a connector requires us to grab the lock and
287  * state for the new crtc, as needed. This function takes care of all these
288  * details besides updating the pointer in the state object itself.
289  *
290  * Returns:
291  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
292  * then the w/w mutex code has detected a deadlock and the entire atomic
293  * sequence must be restarted. All other errors are fatal.
294  */
295 int
296 drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
297                                   struct drm_crtc *crtc)
298 {
299         struct drm_connector *connector = conn_state->connector;
300         struct drm_crtc_state *crtc_state;
301
302         if (conn_state->crtc == crtc)
303                 return 0;
304
305         if (conn_state->crtc) {
306                 crtc_state = drm_atomic_get_new_crtc_state(conn_state->state,
307                                                            conn_state->crtc);
308
309                 crtc_state->connector_mask &=
310                         ~drm_connector_mask(conn_state->connector);
311
312                 drm_connector_put(conn_state->connector);
313                 conn_state->crtc = NULL;
314         }
315
316         if (crtc) {
317                 crtc_state = drm_atomic_get_crtc_state(conn_state->state, crtc);
318                 if (IS_ERR(crtc_state))
319                         return PTR_ERR(crtc_state);
320
321                 crtc_state->connector_mask |=
322                         drm_connector_mask(conn_state->connector);
323
324                 drm_connector_get(conn_state->connector);
325                 conn_state->crtc = crtc;
326
327                 DRM_DEBUG_ATOMIC("Link [CONNECTOR:%d:%s] state %p to [CRTC:%d:%s]\n",
328                                  connector->base.id, connector->name,
329                                  conn_state, crtc->base.id, crtc->name);
330         } else {
331                 DRM_DEBUG_ATOMIC("Link [CONNECTOR:%d:%s] state %p to [NOCRTC]\n",
332                                  connector->base.id, connector->name,
333                                  conn_state);
334         }
335
336         return 0;
337 }
338 EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector);
339
340 static void set_out_fence_for_crtc(struct drm_atomic_state *state,
341                                    struct drm_crtc *crtc, s32 __user *fence_ptr)
342 {
343         state->crtcs[drm_crtc_index(crtc)].out_fence_ptr = fence_ptr;
344 }
345
346 static s32 __user *get_out_fence_for_crtc(struct drm_atomic_state *state,
347                                           struct drm_crtc *crtc)
348 {
349         s32 __user *fence_ptr;
350
351         fence_ptr = state->crtcs[drm_crtc_index(crtc)].out_fence_ptr;
352         state->crtcs[drm_crtc_index(crtc)].out_fence_ptr = NULL;
353
354         return fence_ptr;
355 }
356
357 static int set_out_fence_for_connector(struct drm_atomic_state *state,
358                                         struct drm_connector *connector,
359                                         s32 __user *fence_ptr)
360 {
361         unsigned int index = drm_connector_index(connector);
362
363         if (!fence_ptr)
364                 return 0;
365
366         if (put_user(-1, fence_ptr))
367                 return -EFAULT;
368
369         state->connectors[index].out_fence_ptr = fence_ptr;
370
371         return 0;
372 }
373
374 static s32 __user *get_out_fence_for_connector(struct drm_atomic_state *state,
375                                                struct drm_connector *connector)
376 {
377         unsigned int index = drm_connector_index(connector);
378         s32 __user *fence_ptr;
379
380         fence_ptr = state->connectors[index].out_fence_ptr;
381         state->connectors[index].out_fence_ptr = NULL;
382
383         return fence_ptr;
384 }
385
386 static int
387 drm_atomic_replace_property_blob_from_id(struct drm_device *dev,
388                                          struct drm_property_blob **blob,
389                                          uint64_t blob_id,
390                                          ssize_t expected_size,
391                                          ssize_t expected_elem_size,
392                                          bool *replaced)
393 {
394         struct drm_property_blob *new_blob = NULL;
395
396         if (blob_id != 0) {
397                 new_blob = drm_property_lookup_blob(dev, blob_id);
398                 if (new_blob == NULL)
399                         return -EINVAL;
400
401                 if (expected_size > 0 &&
402                     new_blob->length != expected_size) {
403                         drm_property_blob_put(new_blob);
404                         return -EINVAL;
405                 }
406                 if (expected_elem_size > 0 &&
407                     new_blob->length % expected_elem_size != 0) {
408                         drm_property_blob_put(new_blob);
409                         return -EINVAL;
410                 }
411         }
412
413         *replaced |= drm_property_replace_blob(blob, new_blob);
414         drm_property_blob_put(new_blob);
415
416         return 0;
417 }
418
419 static int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
420                 struct drm_crtc_state *state, struct drm_property *property,
421                 uint64_t val)
422 {
423         struct drm_device *dev = crtc->dev;
424         struct drm_mode_config *config = &dev->mode_config;
425         bool replaced = false;
426         int ret;
427
428         if (property == config->prop_active)
429                 state->active = val;
430         else if (property == config->prop_mode_id) {
431                 struct drm_property_blob *mode =
432                         drm_property_lookup_blob(dev, val);
433                 ret = drm_atomic_set_mode_prop_for_crtc(state, mode);
434                 drm_property_blob_put(mode);
435                 return ret;
436         } else if (property == config->prop_vrr_enabled) {
437                 state->vrr_enabled = val;
438         } else if (property == config->degamma_lut_property) {
439                 ret = drm_atomic_replace_property_blob_from_id(dev,
440                                         &state->degamma_lut,
441                                         val,
442                                         -1, sizeof(struct drm_color_lut),
443                                         &replaced);
444                 state->color_mgmt_changed |= replaced;
445                 return ret;
446         } else if (property == config->ctm_property) {
447                 ret = drm_atomic_replace_property_blob_from_id(dev,
448                                         &state->ctm,
449                                         val,
450                                         sizeof(struct drm_color_ctm), -1,
451                                         &replaced);
452                 state->color_mgmt_changed |= replaced;
453                 return ret;
454         } else if (property == config->gamma_lut_property) {
455                 ret = drm_atomic_replace_property_blob_from_id(dev,
456                                         &state->gamma_lut,
457                                         val,
458                                         -1, sizeof(struct drm_color_lut),
459                                         &replaced);
460                 state->color_mgmt_changed |= replaced;
461                 return ret;
462         } else if (property == config->prop_out_fence_ptr) {
463                 s32 __user *fence_ptr = u64_to_user_ptr(val);
464
465                 if (!fence_ptr)
466                         return 0;
467
468                 if (put_user(-1, fence_ptr))
469                         return -EFAULT;
470
471                 set_out_fence_for_crtc(state->state, crtc, fence_ptr);
472         } else if (crtc->funcs->atomic_set_property) {
473                 return crtc->funcs->atomic_set_property(crtc, state, property, val);
474         } else {
475                 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] unknown property [PROP:%d:%s]]\n",
476                                  crtc->base.id, crtc->name,
477                                  property->base.id, property->name);
478                 return -EINVAL;
479         }
480
481         return 0;
482 }
483
484 static int
485 drm_atomic_crtc_get_property(struct drm_crtc *crtc,
486                 const struct drm_crtc_state *state,
487                 struct drm_property *property, uint64_t *val)
488 {
489         struct drm_device *dev = crtc->dev;
490         struct drm_mode_config *config = &dev->mode_config;
491
492         if (property == config->prop_active)
493                 *val = state->active;
494         else if (property == config->prop_mode_id)
495                 *val = (state->mode_blob) ? state->mode_blob->base.id : 0;
496         else if (property == config->prop_vrr_enabled)
497                 *val = state->vrr_enabled;
498         else if (property == config->degamma_lut_property)
499                 *val = (state->degamma_lut) ? state->degamma_lut->base.id : 0;
500         else if (property == config->ctm_property)
501                 *val = (state->ctm) ? state->ctm->base.id : 0;
502         else if (property == config->gamma_lut_property)
503                 *val = (state->gamma_lut) ? state->gamma_lut->base.id : 0;
504         else if (property == config->prop_out_fence_ptr)
505                 *val = 0;
506         else if (crtc->funcs->atomic_get_property)
507                 return crtc->funcs->atomic_get_property(crtc, state, property, val);
508         else
509                 return -EINVAL;
510
511         return 0;
512 }
513
514 static int drm_atomic_plane_set_property(struct drm_plane *plane,
515                 struct drm_plane_state *state, struct drm_file *file_priv,
516                 struct drm_property *property, uint64_t val)
517 {
518         struct drm_device *dev = plane->dev;
519         struct drm_mode_config *config = &dev->mode_config;
520         bool replaced = false;
521         int ret;
522
523         if (property == config->prop_fb_id) {
524                 struct drm_framebuffer *fb;
525                 fb = drm_framebuffer_lookup(dev, file_priv, val);
526                 drm_atomic_set_fb_for_plane(state, fb);
527                 if (fb)
528                         drm_framebuffer_put(fb);
529         } else if (property == config->prop_in_fence_fd) {
530                 if (state->fence)
531                         return -EINVAL;
532
533                 if (U642I64(val) == -1)
534                         return 0;
535
536                 state->fence = sync_file_get_fence(val);
537                 if (!state->fence)
538                         return -EINVAL;
539
540         } else if (property == config->prop_crtc_id) {
541                 struct drm_crtc *crtc = drm_crtc_find(dev, file_priv, val);
542                 if (val && !crtc)
543                         return -EACCES;
544                 return drm_atomic_set_crtc_for_plane(state, crtc);
545         } else if (property == config->prop_crtc_x) {
546                 state->crtc_x = U642I64(val);
547         } else if (property == config->prop_crtc_y) {
548                 state->crtc_y = U642I64(val);
549         } else if (property == config->prop_crtc_w) {
550                 state->crtc_w = val;
551         } else if (property == config->prop_crtc_h) {
552                 state->crtc_h = val;
553         } else if (property == config->prop_src_x) {
554                 state->src_x = val;
555         } else if (property == config->prop_src_y) {
556                 state->src_y = val;
557         } else if (property == config->prop_src_w) {
558                 state->src_w = val;
559         } else if (property == config->prop_src_h) {
560                 state->src_h = val;
561         } else if (property == plane->alpha_property) {
562                 state->alpha = val;
563         } else if (property == plane->blend_mode_property) {
564                 state->pixel_blend_mode = val;
565         } else if (property == plane->rotation_property) {
566                 if (!is_power_of_2(val & DRM_MODE_ROTATE_MASK)) {
567                         DRM_DEBUG_ATOMIC("[PLANE:%d:%s] bad rotation bitmask: 0x%llx\n",
568                                          plane->base.id, plane->name, val);
569                         return -EINVAL;
570                 }
571                 state->rotation = val;
572         } else if (property == plane->zpos_property) {
573                 state->zpos = val;
574         } else if (property == plane->color_encoding_property) {
575                 state->color_encoding = val;
576         } else if (property == plane->color_range_property) {
577                 state->color_range = val;
578         } else if (property == config->prop_fb_damage_clips) {
579                 ret = drm_atomic_replace_property_blob_from_id(dev,
580                                         &state->fb_damage_clips,
581                                         val,
582                                         -1,
583                                         sizeof(struct drm_rect),
584                                         &replaced);
585                 return ret;
586         } else if (plane->funcs->atomic_set_property) {
587                 return plane->funcs->atomic_set_property(plane, state,
588                                 property, val);
589         } else {
590                 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] unknown property [PROP:%d:%s]]\n",
591                                  plane->base.id, plane->name,
592                                  property->base.id, property->name);
593                 return -EINVAL;
594         }
595
596         return 0;
597 }
598
599 static int
600 drm_atomic_plane_get_property(struct drm_plane *plane,
601                 const struct drm_plane_state *state,
602                 struct drm_property *property, uint64_t *val)
603 {
604         struct drm_device *dev = plane->dev;
605         struct drm_mode_config *config = &dev->mode_config;
606
607         if (property == config->prop_fb_id) {
608                 *val = (state->fb) ? state->fb->base.id : 0;
609         } else if (property == config->prop_in_fence_fd) {
610                 *val = -1;
611         } else if (property == config->prop_crtc_id) {
612                 *val = (state->crtc) ? state->crtc->base.id : 0;
613         } else if (property == config->prop_crtc_x) {
614                 *val = I642U64(state->crtc_x);
615         } else if (property == config->prop_crtc_y) {
616                 *val = I642U64(state->crtc_y);
617         } else if (property == config->prop_crtc_w) {
618                 *val = state->crtc_w;
619         } else if (property == config->prop_crtc_h) {
620                 *val = state->crtc_h;
621         } else if (property == config->prop_src_x) {
622                 *val = state->src_x;
623         } else if (property == config->prop_src_y) {
624                 *val = state->src_y;
625         } else if (property == config->prop_src_w) {
626                 *val = state->src_w;
627         } else if (property == config->prop_src_h) {
628                 *val = state->src_h;
629         } else if (property == plane->alpha_property) {
630                 *val = state->alpha;
631         } else if (property == plane->blend_mode_property) {
632                 *val = state->pixel_blend_mode;
633         } else if (property == plane->rotation_property) {
634                 *val = state->rotation;
635         } else if (property == plane->zpos_property) {
636                 *val = state->zpos;
637         } else if (property == plane->color_encoding_property) {
638                 *val = state->color_encoding;
639         } else if (property == plane->color_range_property) {
640                 *val = state->color_range;
641         } else if (property == config->prop_fb_damage_clips) {
642                 *val = (state->fb_damage_clips) ?
643                         state->fb_damage_clips->base.id : 0;
644         } else if (plane->funcs->atomic_get_property) {
645                 return plane->funcs->atomic_get_property(plane, state, property, val);
646         } else {
647                 return -EINVAL;
648         }
649
650         return 0;
651 }
652
653 static int drm_atomic_set_writeback_fb_for_connector(
654                 struct drm_connector_state *conn_state,
655                 struct drm_framebuffer *fb)
656 {
657         int ret;
658
659         ret = drm_writeback_set_fb(conn_state, fb);
660         if (ret < 0)
661                 return ret;
662
663         if (fb)
664                 DRM_DEBUG_ATOMIC("Set [FB:%d] for connector state %p\n",
665                                  fb->base.id, conn_state);
666         else
667                 DRM_DEBUG_ATOMIC("Set [NOFB] for connector state %p\n",
668                                  conn_state);
669
670         return 0;
671 }
672
673 static int drm_atomic_connector_set_property(struct drm_connector *connector,
674                 struct drm_connector_state *state, struct drm_file *file_priv,
675                 struct drm_property *property, uint64_t val)
676 {
677         struct drm_device *dev = connector->dev;
678         struct drm_mode_config *config = &dev->mode_config;
679
680         if (property == config->prop_crtc_id) {
681                 struct drm_crtc *crtc = drm_crtc_find(dev, file_priv, val);
682                 if (val && !crtc)
683                         return -EACCES;
684                 return drm_atomic_set_crtc_for_connector(state, crtc);
685         } else if (property == config->dpms_property) {
686                 /* setting DPMS property requires special handling, which
687                  * is done in legacy setprop path for us.  Disallow (for
688                  * now?) atomic writes to DPMS property:
689                  */
690                 return -EINVAL;
691         } else if (property == config->tv_select_subconnector_property) {
692                 state->tv.subconnector = val;
693         } else if (property == config->tv_left_margin_property) {
694                 state->tv.margins.left = val;
695         } else if (property == config->tv_right_margin_property) {
696                 state->tv.margins.right = val;
697         } else if (property == config->tv_top_margin_property) {
698                 state->tv.margins.top = val;
699         } else if (property == config->tv_bottom_margin_property) {
700                 state->tv.margins.bottom = val;
701         } else if (property == config->tv_mode_property) {
702                 state->tv.mode = val;
703         } else if (property == config->tv_brightness_property) {
704                 state->tv.brightness = val;
705         } else if (property == config->tv_contrast_property) {
706                 state->tv.contrast = val;
707         } else if (property == config->tv_flicker_reduction_property) {
708                 state->tv.flicker_reduction = val;
709         } else if (property == config->tv_overscan_property) {
710                 state->tv.overscan = val;
711         } else if (property == config->tv_saturation_property) {
712                 state->tv.saturation = val;
713         } else if (property == config->tv_hue_property) {
714                 state->tv.hue = val;
715         } else if (property == config->link_status_property) {
716                 /* Never downgrade from GOOD to BAD on userspace's request here,
717                  * only hw issues can do that.
718                  *
719                  * For an atomic property the userspace doesn't need to be able
720                  * to understand all the properties, but needs to be able to
721                  * restore the state it wants on VT switch. So if the userspace
722                  * tries to change the link_status from GOOD to BAD, driver
723                  * silently rejects it and returns a 0. This prevents userspace
724                  * from accidently breaking  the display when it restores the
725                  * state.
726                  */
727                 if (state->link_status != DRM_LINK_STATUS_GOOD)
728                         state->link_status = val;
729         } else if (property == config->aspect_ratio_property) {
730                 state->picture_aspect_ratio = val;
731         } else if (property == config->content_type_property) {
732                 state->content_type = val;
733         } else if (property == connector->scaling_mode_property) {
734                 state->scaling_mode = val;
735         } else if (property == connector->content_protection_property) {
736                 if (val == DRM_MODE_CONTENT_PROTECTION_ENABLED) {
737                         DRM_DEBUG_KMS("only drivers can set CP Enabled\n");
738                         return -EINVAL;
739                 }
740                 state->content_protection = val;
741         } else if (property == connector->colorspace_property) {
742                 state->colorspace = val;
743         } else if (property == config->writeback_fb_id_property) {
744                 struct drm_framebuffer *fb;
745                 int ret;
746                 fb = drm_framebuffer_lookup(dev, file_priv, val);
747                 ret = drm_atomic_set_writeback_fb_for_connector(state, fb);
748                 if (fb)
749                         drm_framebuffer_put(fb);
750                 return ret;
751         } else if (property == config->writeback_out_fence_ptr_property) {
752                 s32 __user *fence_ptr = u64_to_user_ptr(val);
753
754                 return set_out_fence_for_connector(state->state, connector,
755                                                    fence_ptr);
756         } else if (property == connector->max_bpc_property) {
757                 state->max_requested_bpc = val;
758         } else if (connector->funcs->atomic_set_property) {
759                 return connector->funcs->atomic_set_property(connector,
760                                 state, property, val);
761         } else {
762                 DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] unknown property [PROP:%d:%s]]\n",
763                                  connector->base.id, connector->name,
764                                  property->base.id, property->name);
765                 return -EINVAL;
766         }
767
768         return 0;
769 }
770
771 static int
772 drm_atomic_connector_get_property(struct drm_connector *connector,
773                 const struct drm_connector_state *state,
774                 struct drm_property *property, uint64_t *val)
775 {
776         struct drm_device *dev = connector->dev;
777         struct drm_mode_config *config = &dev->mode_config;
778
779         if (property == config->prop_crtc_id) {
780                 *val = (state->crtc) ? state->crtc->base.id : 0;
781         } else if (property == config->dpms_property) {
782                 *val = connector->dpms;
783         } else if (property == config->tv_select_subconnector_property) {
784                 *val = state->tv.subconnector;
785         } else if (property == config->tv_left_margin_property) {
786                 *val = state->tv.margins.left;
787         } else if (property == config->tv_right_margin_property) {
788                 *val = state->tv.margins.right;
789         } else if (property == config->tv_top_margin_property) {
790                 *val = state->tv.margins.top;
791         } else if (property == config->tv_bottom_margin_property) {
792                 *val = state->tv.margins.bottom;
793         } else if (property == config->tv_mode_property) {
794                 *val = state->tv.mode;
795         } else if (property == config->tv_brightness_property) {
796                 *val = state->tv.brightness;
797         } else if (property == config->tv_contrast_property) {
798                 *val = state->tv.contrast;
799         } else if (property == config->tv_flicker_reduction_property) {
800                 *val = state->tv.flicker_reduction;
801         } else if (property == config->tv_overscan_property) {
802                 *val = state->tv.overscan;
803         } else if (property == config->tv_saturation_property) {
804                 *val = state->tv.saturation;
805         } else if (property == config->tv_hue_property) {
806                 *val = state->tv.hue;
807         } else if (property == config->link_status_property) {
808                 *val = state->link_status;
809         } else if (property == config->aspect_ratio_property) {
810                 *val = state->picture_aspect_ratio;
811         } else if (property == config->content_type_property) {
812                 *val = state->content_type;
813         } else if (property == connector->colorspace_property) {
814                 *val = state->colorspace;
815         } else if (property == connector->scaling_mode_property) {
816                 *val = state->scaling_mode;
817         } else if (property == connector->content_protection_property) {
818                 *val = state->content_protection;
819         } else if (property == config->writeback_fb_id_property) {
820                 /* Writeback framebuffer is one-shot, write and forget */
821                 *val = 0;
822         } else if (property == config->writeback_out_fence_ptr_property) {
823                 *val = 0;
824         } else if (property == connector->max_bpc_property) {
825                 *val = state->max_requested_bpc;
826         } else if (connector->funcs->atomic_get_property) {
827                 return connector->funcs->atomic_get_property(connector,
828                                 state, property, val);
829         } else {
830                 return -EINVAL;
831         }
832
833         return 0;
834 }
835
836 int drm_atomic_get_property(struct drm_mode_object *obj,
837                 struct drm_property *property, uint64_t *val)
838 {
839         struct drm_device *dev = property->dev;
840         int ret;
841
842         switch (obj->type) {
843         case DRM_MODE_OBJECT_CONNECTOR: {
844                 struct drm_connector *connector = obj_to_connector(obj);
845                 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
846                 ret = drm_atomic_connector_get_property(connector,
847                                 connector->state, property, val);
848                 break;
849         }
850         case DRM_MODE_OBJECT_CRTC: {
851                 struct drm_crtc *crtc = obj_to_crtc(obj);
852                 WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
853                 ret = drm_atomic_crtc_get_property(crtc,
854                                 crtc->state, property, val);
855                 break;
856         }
857         case DRM_MODE_OBJECT_PLANE: {
858                 struct drm_plane *plane = obj_to_plane(obj);
859                 WARN_ON(!drm_modeset_is_locked(&plane->mutex));
860                 ret = drm_atomic_plane_get_property(plane,
861                                 plane->state, property, val);
862                 break;
863         }
864         default:
865                 ret = -EINVAL;
866                 break;
867         }
868
869         return ret;
870 }
871
872 /*
873  * The big monster ioctl
874  */
875
876 static struct drm_pending_vblank_event *create_vblank_event(
877                 struct drm_crtc *crtc, uint64_t user_data)
878 {
879         struct drm_pending_vblank_event *e = NULL;
880
881         e = kzalloc(sizeof *e, GFP_KERNEL);
882         if (!e)
883                 return NULL;
884
885         e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
886         e->event.base.length = sizeof(e->event);
887         e->event.vbl.crtc_id = crtc->base.id;
888         e->event.vbl.user_data = user_data;
889
890         return e;
891 }
892
893 int drm_atomic_connector_commit_dpms(struct drm_atomic_state *state,
894                                      struct drm_connector *connector,
895                                      int mode)
896 {
897         struct drm_connector *tmp_connector;
898         struct drm_connector_state *new_conn_state;
899         struct drm_crtc *crtc;
900         struct drm_crtc_state *crtc_state;
901         int i, ret, old_mode = connector->dpms;
902         bool active = false;
903
904         ret = drm_modeset_lock(&state->dev->mode_config.connection_mutex,
905                                state->acquire_ctx);
906         if (ret)
907                 return ret;
908
909         if (mode != DRM_MODE_DPMS_ON)
910                 mode = DRM_MODE_DPMS_OFF;
911         connector->dpms = mode;
912
913         crtc = connector->state->crtc;
914         if (!crtc)
915                 goto out;
916         ret = drm_atomic_add_affected_connectors(state, crtc);
917         if (ret)
918                 goto out;
919
920         crtc_state = drm_atomic_get_crtc_state(state, crtc);
921         if (IS_ERR(crtc_state)) {
922                 ret = PTR_ERR(crtc_state);
923                 goto out;
924         }
925
926         for_each_new_connector_in_state(state, tmp_connector, new_conn_state, i) {
927                 if (new_conn_state->crtc != crtc)
928                         continue;
929                 if (tmp_connector->dpms == DRM_MODE_DPMS_ON) {
930                         active = true;
931                         break;
932                 }
933         }
934
935         crtc_state->active = active;
936         ret = drm_atomic_commit(state);
937 out:
938         if (ret != 0)
939                 connector->dpms = old_mode;
940         return ret;
941 }
942
943 int drm_atomic_set_property(struct drm_atomic_state *state,
944                             struct drm_file *file_priv,
945                             struct drm_mode_object *obj,
946                             struct drm_property *prop,
947                             uint64_t prop_value)
948 {
949         struct drm_mode_object *ref;
950         int ret;
951
952         if (!drm_property_change_valid_get(prop, prop_value, &ref))
953                 return -EINVAL;
954
955         switch (obj->type) {
956         case DRM_MODE_OBJECT_CONNECTOR: {
957                 struct drm_connector *connector = obj_to_connector(obj);
958                 struct drm_connector_state *connector_state;
959
960                 connector_state = drm_atomic_get_connector_state(state, connector);
961                 if (IS_ERR(connector_state)) {
962                         ret = PTR_ERR(connector_state);
963                         break;
964                 }
965
966                 ret = drm_atomic_connector_set_property(connector,
967                                 connector_state, file_priv,
968                                 prop, prop_value);
969                 break;
970         }
971         case DRM_MODE_OBJECT_CRTC: {
972                 struct drm_crtc *crtc = obj_to_crtc(obj);
973                 struct drm_crtc_state *crtc_state;
974
975                 crtc_state = drm_atomic_get_crtc_state(state, crtc);
976                 if (IS_ERR(crtc_state)) {
977                         ret = PTR_ERR(crtc_state);
978                         break;
979                 }
980
981                 ret = drm_atomic_crtc_set_property(crtc,
982                                 crtc_state, prop, prop_value);
983                 break;
984         }
985         case DRM_MODE_OBJECT_PLANE: {
986                 struct drm_plane *plane = obj_to_plane(obj);
987                 struct drm_plane_state *plane_state;
988
989                 plane_state = drm_atomic_get_plane_state(state, plane);
990                 if (IS_ERR(plane_state)) {
991                         ret = PTR_ERR(plane_state);
992                         break;
993                 }
994
995                 ret = drm_atomic_plane_set_property(plane,
996                                 plane_state, file_priv,
997                                 prop, prop_value);
998                 break;
999         }
1000         default:
1001                 ret = -EINVAL;
1002                 break;
1003         }
1004
1005         drm_property_change_valid_put(prop, ref);
1006         return ret;
1007 }
1008
1009 /**
1010  * DOC: explicit fencing properties
1011  *
1012  * Explicit fencing allows userspace to control the buffer synchronization
1013  * between devices. A Fence or a group of fences are transfered to/from
1014  * userspace using Sync File fds and there are two DRM properties for that.
1015  * IN_FENCE_FD on each DRM Plane to send fences to the kernel and
1016  * OUT_FENCE_PTR on each DRM CRTC to receive fences from the kernel.
1017  *
1018  * As a contrast, with implicit fencing the kernel keeps track of any
1019  * ongoing rendering, and automatically ensures that the atomic update waits
1020  * for any pending rendering to complete. For shared buffers represented with
1021  * a &struct dma_buf this is tracked in &struct reservation_object.
1022  * Implicit syncing is how Linux traditionally worked (e.g. DRI2/3 on X.org),
1023  * whereas explicit fencing is what Android wants.
1024  *
1025  * "IN_FENCE_FD”:
1026  *      Use this property to pass a fence that DRM should wait on before
1027  *      proceeding with the Atomic Commit request and show the framebuffer for
1028  *      the plane on the screen. The fence can be either a normal fence or a
1029  *      merged one, the sync_file framework will handle both cases and use a
1030  *      fence_array if a merged fence is received. Passing -1 here means no
1031  *      fences to wait on.
1032  *
1033  *      If the Atomic Commit request has the DRM_MODE_ATOMIC_TEST_ONLY flag
1034  *      it will only check if the Sync File is a valid one.
1035  *
1036  *      On the driver side the fence is stored on the @fence parameter of
1037  *      &struct drm_plane_state. Drivers which also support implicit fencing
1038  *      should set the implicit fence using drm_atomic_set_fence_for_plane(),
1039  *      to make sure there's consistent behaviour between drivers in precedence
1040  *      of implicit vs. explicit fencing.
1041  *
1042  * "OUT_FENCE_PTR”:
1043  *      Use this property to pass a file descriptor pointer to DRM. Once the
1044  *      Atomic Commit request call returns OUT_FENCE_PTR will be filled with
1045  *      the file descriptor number of a Sync File. This Sync File contains the
1046  *      CRTC fence that will be signaled when all framebuffers present on the
1047  *      Atomic Commit * request for that given CRTC are scanned out on the
1048  *      screen.
1049  *
1050  *      The Atomic Commit request fails if a invalid pointer is passed. If the
1051  *      Atomic Commit request fails for any other reason the out fence fd
1052  *      returned will be -1. On a Atomic Commit with the
1053  *      DRM_MODE_ATOMIC_TEST_ONLY flag the out fence will also be set to -1.
1054  *
1055  *      Note that out-fences don't have a special interface to drivers and are
1056  *      internally represented by a &struct drm_pending_vblank_event in struct
1057  *      &drm_crtc_state, which is also used by the nonblocking atomic commit
1058  *      helpers and for the DRM event handling for existing userspace.
1059  */
1060
1061 struct drm_out_fence_state {
1062         s32 __user *out_fence_ptr;
1063         struct sync_file *sync_file;
1064         int fd;
1065 };
1066
1067 static int setup_out_fence(struct drm_out_fence_state *fence_state,
1068                            struct dma_fence *fence)
1069 {
1070         fence_state->fd = get_unused_fd_flags(O_CLOEXEC);
1071         if (fence_state->fd < 0)
1072                 return fence_state->fd;
1073
1074         if (put_user(fence_state->fd, fence_state->out_fence_ptr))
1075                 return -EFAULT;
1076
1077         fence_state->sync_file = sync_file_create(fence);
1078         if (!fence_state->sync_file)
1079                 return -ENOMEM;
1080
1081         return 0;
1082 }
1083
1084 static int prepare_signaling(struct drm_device *dev,
1085                                   struct drm_atomic_state *state,
1086                                   struct drm_mode_atomic *arg,
1087                                   struct drm_file *file_priv,
1088                                   struct drm_out_fence_state **fence_state,
1089                                   unsigned int *num_fences)
1090 {
1091         struct drm_crtc *crtc;
1092         struct drm_crtc_state *crtc_state;
1093         struct drm_connector *conn;
1094         struct drm_connector_state *conn_state;
1095         int i, c = 0, ret;
1096
1097         if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)
1098                 return 0;
1099
1100         for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1101                 s32 __user *fence_ptr;
1102
1103                 fence_ptr = get_out_fence_for_crtc(crtc_state->state, crtc);
1104
1105                 if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT || fence_ptr) {
1106                         struct drm_pending_vblank_event *e;
1107
1108                         e = create_vblank_event(crtc, arg->user_data);
1109                         if (!e)
1110                                 return -ENOMEM;
1111
1112                         crtc_state->event = e;
1113                 }
1114
1115                 if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
1116                         struct drm_pending_vblank_event *e = crtc_state->event;
1117
1118                         if (!file_priv)
1119                                 continue;
1120
1121                         ret = drm_event_reserve_init(dev, file_priv, &e->base,
1122                                                      &e->event.base);
1123                         if (ret) {
1124                                 kfree(e);
1125                                 crtc_state->event = NULL;
1126                                 return ret;
1127                         }
1128                 }
1129
1130                 if (fence_ptr) {
1131                         struct dma_fence *fence;
1132                         struct drm_out_fence_state *f;
1133
1134                         f = krealloc(*fence_state, sizeof(**fence_state) *
1135                                      (*num_fences + 1), GFP_KERNEL);
1136                         if (!f)
1137                                 return -ENOMEM;
1138
1139                         memset(&f[*num_fences], 0, sizeof(*f));
1140
1141                         f[*num_fences].out_fence_ptr = fence_ptr;
1142                         *fence_state = f;
1143
1144                         fence = drm_crtc_create_fence(crtc);
1145                         if (!fence)
1146                                 return -ENOMEM;
1147
1148                         ret = setup_out_fence(&f[(*num_fences)++], fence);
1149                         if (ret) {
1150                                 dma_fence_put(fence);
1151                                 return ret;
1152                         }
1153
1154                         crtc_state->event->base.fence = fence;
1155                 }
1156
1157                 c++;
1158         }
1159
1160         for_each_new_connector_in_state(state, conn, conn_state, i) {
1161                 struct drm_writeback_connector *wb_conn;
1162                 struct drm_out_fence_state *f;
1163                 struct dma_fence *fence;
1164                 s32 __user *fence_ptr;
1165
1166                 if (!conn_state->writeback_job)
1167                         continue;
1168
1169                 fence_ptr = get_out_fence_for_connector(state, conn);
1170                 if (!fence_ptr)
1171                         continue;
1172
1173                 f = krealloc(*fence_state, sizeof(**fence_state) *
1174                              (*num_fences + 1), GFP_KERNEL);
1175                 if (!f)
1176                         return -ENOMEM;
1177
1178                 memset(&f[*num_fences], 0, sizeof(*f));
1179
1180                 f[*num_fences].out_fence_ptr = fence_ptr;
1181                 *fence_state = f;
1182
1183                 wb_conn = drm_connector_to_writeback(conn);
1184                 fence = drm_writeback_get_out_fence(wb_conn);
1185                 if (!fence)
1186                         return -ENOMEM;
1187
1188                 ret = setup_out_fence(&f[(*num_fences)++], fence);
1189                 if (ret) {
1190                         dma_fence_put(fence);
1191                         return ret;
1192                 }
1193
1194                 conn_state->writeback_job->out_fence = fence;
1195         }
1196
1197         /*
1198          * Having this flag means user mode pends on event which will never
1199          * reach due to lack of at least one CRTC for signaling
1200          */
1201         if (c == 0 && (arg->flags & DRM_MODE_PAGE_FLIP_EVENT))
1202                 return -EINVAL;
1203
1204         return 0;
1205 }
1206
1207 static void complete_signaling(struct drm_device *dev,
1208                                struct drm_atomic_state *state,
1209                                struct drm_out_fence_state *fence_state,
1210                                unsigned int num_fences,
1211                                bool install_fds)
1212 {
1213         struct drm_crtc *crtc;
1214         struct drm_crtc_state *crtc_state;
1215         int i;
1216
1217         if (install_fds) {
1218                 for (i = 0; i < num_fences; i++)
1219                         fd_install(fence_state[i].fd,
1220                                    fence_state[i].sync_file->file);
1221
1222                 kfree(fence_state);
1223                 return;
1224         }
1225
1226         for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1227                 struct drm_pending_vblank_event *event = crtc_state->event;
1228                 /*
1229                  * Free the allocated event. drm_atomic_helper_setup_commit
1230                  * can allocate an event too, so only free it if it's ours
1231                  * to prevent a double free in drm_atomic_state_clear.
1232                  */
1233                 if (event && (event->base.fence || event->base.file_priv)) {
1234                         drm_event_cancel_free(dev, &event->base);
1235                         crtc_state->event = NULL;
1236                 }
1237         }
1238
1239         if (!fence_state)
1240                 return;
1241
1242         for (i = 0; i < num_fences; i++) {
1243                 if (fence_state[i].sync_file)
1244                         fput(fence_state[i].sync_file->file);
1245                 if (fence_state[i].fd >= 0)
1246                         put_unused_fd(fence_state[i].fd);
1247
1248                 /* If this fails log error to the user */
1249                 if (fence_state[i].out_fence_ptr &&
1250                     put_user(-1, fence_state[i].out_fence_ptr))
1251                         DRM_DEBUG_ATOMIC("Couldn't clear out_fence_ptr\n");
1252         }
1253
1254         kfree(fence_state);
1255 }
1256
1257 int drm_mode_atomic_ioctl(struct drm_device *dev,
1258                           void *data, struct drm_file *file_priv)
1259 {
1260         struct drm_mode_atomic *arg = data;
1261         uint32_t __user *objs_ptr = (uint32_t __user *)(unsigned long)(arg->objs_ptr);
1262         uint32_t __user *count_props_ptr = (uint32_t __user *)(unsigned long)(arg->count_props_ptr);
1263         uint32_t __user *props_ptr = (uint32_t __user *)(unsigned long)(arg->props_ptr);
1264         uint64_t __user *prop_values_ptr = (uint64_t __user *)(unsigned long)(arg->prop_values_ptr);
1265         unsigned int copied_objs, copied_props;
1266         struct drm_atomic_state *state;
1267         struct drm_modeset_acquire_ctx ctx;
1268         struct drm_out_fence_state *fence_state;
1269         int ret = 0;
1270         unsigned int i, j, num_fences;
1271
1272         /* disallow for drivers not supporting atomic: */
1273         if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
1274                 return -EOPNOTSUPP;
1275
1276         /* disallow for userspace that has not enabled atomic cap (even
1277          * though this may be a bit overkill, since legacy userspace
1278          * wouldn't know how to call this ioctl)
1279          */
1280         if (!file_priv->atomic)
1281                 return -EINVAL;
1282
1283         if (arg->flags & ~DRM_MODE_ATOMIC_FLAGS)
1284                 return -EINVAL;
1285
1286         if (arg->reserved)
1287                 return -EINVAL;
1288
1289         if ((arg->flags & DRM_MODE_PAGE_FLIP_ASYNC) &&
1290                         !dev->mode_config.async_page_flip)
1291                 return -EINVAL;
1292
1293         /* can't test and expect an event at the same time. */
1294         if ((arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) &&
1295                         (arg->flags & DRM_MODE_PAGE_FLIP_EVENT))
1296                 return -EINVAL;
1297
1298         state = drm_atomic_state_alloc(dev);
1299         if (!state)
1300                 return -ENOMEM;
1301
1302         drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
1303         state->acquire_ctx = &ctx;
1304         state->allow_modeset = !!(arg->flags & DRM_MODE_ATOMIC_ALLOW_MODESET);
1305
1306 retry:
1307         copied_objs = 0;
1308         copied_props = 0;
1309         fence_state = NULL;
1310         num_fences = 0;
1311
1312         for (i = 0; i < arg->count_objs; i++) {
1313                 uint32_t obj_id, count_props;
1314                 struct drm_mode_object *obj;
1315
1316                 if (get_user(obj_id, objs_ptr + copied_objs)) {
1317                         ret = -EFAULT;
1318                         goto out;
1319                 }
1320
1321                 obj = drm_mode_object_find(dev, file_priv, obj_id, DRM_MODE_OBJECT_ANY);
1322                 if (!obj) {
1323                         ret = -ENOENT;
1324                         goto out;
1325                 }
1326
1327                 if (!obj->properties) {
1328                         drm_mode_object_put(obj);
1329                         ret = -ENOENT;
1330                         goto out;
1331                 }
1332
1333                 if (get_user(count_props, count_props_ptr + copied_objs)) {
1334                         drm_mode_object_put(obj);
1335                         ret = -EFAULT;
1336                         goto out;
1337                 }
1338
1339                 copied_objs++;
1340
1341                 for (j = 0; j < count_props; j++) {
1342                         uint32_t prop_id;
1343                         uint64_t prop_value;
1344                         struct drm_property *prop;
1345
1346                         if (get_user(prop_id, props_ptr + copied_props)) {
1347                                 drm_mode_object_put(obj);
1348                                 ret = -EFAULT;
1349                                 goto out;
1350                         }
1351
1352                         prop = drm_mode_obj_find_prop_id(obj, prop_id);
1353                         if (!prop) {
1354                                 drm_mode_object_put(obj);
1355                                 ret = -ENOENT;
1356                                 goto out;
1357                         }
1358
1359                         if (copy_from_user(&prop_value,
1360                                            prop_values_ptr + copied_props,
1361                                            sizeof(prop_value))) {
1362                                 drm_mode_object_put(obj);
1363                                 ret = -EFAULT;
1364                                 goto out;
1365                         }
1366
1367                         ret = drm_atomic_set_property(state, file_priv,
1368                                                       obj, prop, prop_value);
1369                         if (ret) {
1370                                 drm_mode_object_put(obj);
1371                                 goto out;
1372                         }
1373
1374                         copied_props++;
1375                 }
1376
1377                 drm_mode_object_put(obj);
1378         }
1379
1380         ret = prepare_signaling(dev, state, arg, file_priv, &fence_state,
1381                                 &num_fences);
1382         if (ret)
1383                 goto out;
1384
1385         if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) {
1386                 ret = drm_atomic_check_only(state);
1387         } else if (arg->flags & DRM_MODE_ATOMIC_NONBLOCK) {
1388                 ret = drm_atomic_nonblocking_commit(state);
1389         } else {
1390                 if (unlikely(drm_debug & DRM_UT_STATE))
1391                         drm_atomic_print_state(state);
1392
1393                 ret = drm_atomic_commit(state);
1394         }
1395
1396 out:
1397         complete_signaling(dev, state, fence_state, num_fences, !ret);
1398
1399         if (ret == -EDEADLK) {
1400                 drm_atomic_state_clear(state);
1401                 ret = drm_modeset_backoff(&ctx);
1402                 if (!ret)
1403                         goto retry;
1404         }
1405
1406         drm_atomic_state_put(state);
1407
1408         drm_modeset_drop_locks(&ctx);
1409         drm_modeset_acquire_fini(&ctx);
1410
1411         return ret;
1412 }