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1/*
2 * Copyright (c) 2016 Intel Corporation
3 *
4 * Permission to use, copy, modify, distribute, and sell this software and its
5 * documentation for any purpose is hereby granted without fee, provided that
6 * the above copyright notice appear in all copies and that both that copyright
7 * notice and this permission notice appear in supporting documentation, and
8 * that the name of the copyright holders not be used in advertising or
9 * publicity pertaining to distribution of the software without specific,
10 * written prior permission. The copyright holders make no representations
11 * about the suitability of this software for any purpose. It is provided "as
12 * is" without express or implied warranty.
13 *
14 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
15 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
16 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
17 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
18 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
19 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
20 * OF THIS SOFTWARE.
21 */
22
23#include <linux/export.h>
24#include <linux/uaccess.h>
25
26#include <drm/drm_atomic.h>
27#include <drm/drm_drv.h>
28#include <drm/drm_device.h>
29#include <drm/drm_file.h>
30#include <drm/drm_mode_object.h>
31#include <drm/drm_print.h>
32
33#include "drm_crtc_internal.h"
34
35/*
36 * Internal function to assign a slot in the object idr and optionally
37 * register the object into the idr.
38 */
39int __drm_mode_object_add(struct drm_device *dev, struct drm_mode_object *obj,
40 uint32_t obj_type, bool register_obj,
41 void (*obj_free_cb)(struct kref *kref))
42{
43 int ret;
44
45 WARN_ON(!dev->driver->load && dev->registered && !obj_free_cb);
46
47 mutex_lock(&dev->mode_config.idr_mutex);
48 ret = idr_alloc(&dev->mode_config.object_idr, register_obj ? obj : NULL,
49 1, 0, GFP_KERNEL);
50 if (ret >= 0) {
51 /*
52 * Set up the object linking under the protection of the idr
53 * lock so that other users can't see inconsistent state.
54 */
55 obj->id = ret;
56 obj->type = obj_type;
57 if (obj_free_cb) {
58 obj->free_cb = obj_free_cb;
59 kref_init(&obj->refcount);
60 }
61 }
62 mutex_unlock(&dev->mode_config.idr_mutex);
63
64 return ret < 0 ? ret : 0;
65}
66
67/**
68 * drm_mode_object_add - allocate a new modeset identifier
69 * @dev: DRM device
70 * @obj: object pointer, used to generate unique ID
71 * @obj_type: object type
72 *
73 * Create a unique identifier based on @ptr in @dev's identifier space. Used
74 * for tracking modes, CRTCs and connectors.
75 *
76 * Returns:
77 * Zero on success, error code on failure.
78 */
79int drm_mode_object_add(struct drm_device *dev,
80 struct drm_mode_object *obj, uint32_t obj_type)
81{
82 return __drm_mode_object_add(dev, obj, obj_type, true, NULL);
83}
84
85void drm_mode_object_register(struct drm_device *dev,
86 struct drm_mode_object *obj)
87{
88 mutex_lock(&dev->mode_config.idr_mutex);
89 idr_replace(&dev->mode_config.object_idr, obj, obj->id);
90 mutex_unlock(&dev->mode_config.idr_mutex);
91}
92
93/**
94 * drm_mode_object_unregister - free a modeset identifier
95 * @dev: DRM device
96 * @object: object to free
97 *
98 * Free @id from @dev's unique identifier pool.
99 * This function can be called multiple times, and guards against
100 * multiple removals.
101 * These modeset identifiers are _not_ reference counted. Hence don't use this
102 * for reference counted modeset objects like framebuffers.
103 */
104void drm_mode_object_unregister(struct drm_device *dev,
105 struct drm_mode_object *object)
106{
107 WARN_ON(!dev->driver->load && dev->registered && !object->free_cb);
108
109 mutex_lock(&dev->mode_config.idr_mutex);
110 if (object->id) {
111 idr_remove(&dev->mode_config.object_idr, object->id);
112 object->id = 0;
113 }
114 mutex_unlock(&dev->mode_config.idr_mutex);
115}
116
117/**
118 * drm_mode_object_lease_required - check types which must be leased to be used
119 * @type: type of object
120 *
121 * Returns whether the provided type of drm_mode_object must
122 * be owned or leased to be used by a process.
123 */
124bool drm_mode_object_lease_required(uint32_t type)
125{
126 switch(type) {
127 case DRM_MODE_OBJECT_CRTC:
128 case DRM_MODE_OBJECT_CONNECTOR:
129 case DRM_MODE_OBJECT_PLANE:
130 return true;
131 default:
132 return false;
133 }
134}
135
136struct drm_mode_object *__drm_mode_object_find(struct drm_device *dev,
137 struct drm_file *file_priv,
138 uint32_t id, uint32_t type)
139{
140 struct drm_mode_object *obj = NULL;
141
142 mutex_lock(&dev->mode_config.idr_mutex);
143 obj = idr_find(&dev->mode_config.object_idr, id);
144 if (obj && type != DRM_MODE_OBJECT_ANY && obj->type != type)
145 obj = NULL;
146 if (obj && obj->id != id)
147 obj = NULL;
148
149 if (obj && drm_mode_object_lease_required(obj->type) &&
150 !_drm_lease_held(file_priv, obj->id)) {
151 drm_dbg_kms(dev, "[OBJECT:%d] not included in lease", id);
152 obj = NULL;
153 }
154
155 if (obj && obj->free_cb) {
156 if (!kref_get_unless_zero(&obj->refcount))
157 obj = NULL;
158 }
159 mutex_unlock(&dev->mode_config.idr_mutex);
160
161 return obj;
162}
163
164/**
165 * drm_mode_object_find - look up a drm object with static lifetime
166 * @dev: drm device
167 * @file_priv: drm file
168 * @id: id of the mode object
169 * @type: type of the mode object
170 *
171 * This function is used to look up a modeset object. It will acquire a
172 * reference for reference counted objects. This reference must be dropped again
173 * by callind drm_mode_object_put().
174 */
175struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
176 struct drm_file *file_priv,
177 uint32_t id, uint32_t type)
178{
179 struct drm_mode_object *obj = NULL;
180
181 obj = __drm_mode_object_find(dev, file_priv, id, type);
182 return obj;
183}
184EXPORT_SYMBOL(drm_mode_object_find);
185
186/**
187 * drm_mode_object_put - release a mode object reference
188 * @obj: DRM mode object
189 *
190 * This function decrements the object's refcount if it is a refcounted modeset
191 * object. It is a no-op on any other object. This is used to drop references
192 * acquired with drm_mode_object_get().
193 */
194void drm_mode_object_put(struct drm_mode_object *obj)
195{
196 if (obj->free_cb) {
197 DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount));
198 kref_put(&obj->refcount, obj->free_cb);
199 }
200}
201EXPORT_SYMBOL(drm_mode_object_put);
202
203/**
204 * drm_mode_object_get - acquire a mode object reference
205 * @obj: DRM mode object
206 *
207 * This function increments the object's refcount if it is a refcounted modeset
208 * object. It is a no-op on any other object. References should be dropped again
209 * by calling drm_mode_object_put().
210 */
211void drm_mode_object_get(struct drm_mode_object *obj)
212{
213 if (obj->free_cb) {
214 DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount));
215 kref_get(&obj->refcount);
216 }
217}
218EXPORT_SYMBOL(drm_mode_object_get);
219
220/**
221 * drm_object_attach_property - attach a property to a modeset object
222 * @obj: drm modeset object
223 * @property: property to attach
224 * @init_val: initial value of the property
225 *
226 * This attaches the given property to the modeset object with the given initial
227 * value. Currently this function cannot fail since the properties are stored in
228 * a statically sized array.
229 *
230 * Note that all properties must be attached before the object itself is
231 * registered and accessible from userspace.
232 */
233void drm_object_attach_property(struct drm_mode_object *obj,
234 struct drm_property *property,
235 uint64_t init_val)
236{
237 int count = obj->properties->count;
238 struct drm_device *dev = property->dev;
239
240
241 if (obj->type == DRM_MODE_OBJECT_CONNECTOR) {
242 struct drm_connector *connector = obj_to_connector(obj);
243
244 WARN_ON(!dev->driver->load &&
245 connector->registration_state == DRM_CONNECTOR_REGISTERED);
246 } else {
247 WARN_ON(!dev->driver->load && dev->registered);
248 }
249
250 if (count == DRM_OBJECT_MAX_PROPERTY) {
251 WARN(1, "Failed to attach object property (type: 0x%x). Please "
252 "increase DRM_OBJECT_MAX_PROPERTY by 1 for each time "
253 "you see this message on the same object type.\n",
254 obj->type);
255 return;
256 }
257
258 obj->properties->properties[count] = property;
259 obj->properties->values[count] = init_val;
260 obj->properties->count++;
261}
262EXPORT_SYMBOL(drm_object_attach_property);
263
264/**
265 * drm_object_property_set_value - set the value of a property
266 * @obj: drm mode object to set property value for
267 * @property: property to set
268 * @val: value the property should be set to
269 *
270 * This function sets a given property on a given object. This function only
271 * changes the software state of the property, it does not call into the
272 * driver's ->set_property callback.
273 *
274 * Note that atomic drivers should not have any need to call this, the core will
275 * ensure consistency of values reported back to userspace through the
276 * appropriate ->atomic_get_property callback. Only legacy drivers should call
277 * this function to update the tracked value (after clamping and other
278 * restrictions have been applied).
279 *
280 * Returns:
281 * Zero on success, error code on failure.
282 */
283int drm_object_property_set_value(struct drm_mode_object *obj,
284 struct drm_property *property, uint64_t val)
285{
286 int i;
287
288 WARN_ON(drm_drv_uses_atomic_modeset(property->dev) &&
289 !(property->flags & DRM_MODE_PROP_IMMUTABLE));
290
291 for (i = 0; i < obj->properties->count; i++) {
292 if (obj->properties->properties[i] == property) {
293 obj->properties->values[i] = val;
294 return 0;
295 }
296 }
297
298 return -EINVAL;
299}
300EXPORT_SYMBOL(drm_object_property_set_value);
301
302static int __drm_object_property_get_prop_value(struct drm_mode_object *obj,
303 struct drm_property *property,
304 uint64_t *val)
305{
306 int i;
307
308 for (i = 0; i < obj->properties->count; i++) {
309 if (obj->properties->properties[i] == property) {
310 *val = obj->properties->values[i];
311 return 0;
312 }
313 }
314
315 return -EINVAL;
316}
317
318static int __drm_object_property_get_value(struct drm_mode_object *obj,
319 struct drm_property *property,
320 uint64_t *val)
321{
322
323 /* read-only properties bypass atomic mechanism and still store
324 * their value in obj->properties->values[].. mostly to avoid
325 * having to deal w/ EDID and similar props in atomic paths:
326 */
327 if (drm_drv_uses_atomic_modeset(property->dev) &&
328 !(property->flags & DRM_MODE_PROP_IMMUTABLE))
329 return drm_atomic_get_property(obj, property, val);
330
331 return __drm_object_property_get_prop_value(obj, property, val);
332}
333
334/**
335 * drm_object_property_get_value - retrieve the value of a property
336 * @obj: drm mode object to get property value from
337 * @property: property to retrieve
338 * @val: storage for the property value
339 *
340 * This function retrieves the softare state of the given property for the given
341 * property. Since there is no driver callback to retrieve the current property
342 * value this might be out of sync with the hardware, depending upon the driver
343 * and property.
344 *
345 * Atomic drivers should never call this function directly, the core will read
346 * out property values through the various ->atomic_get_property callbacks.
347 *
348 * Returns:
349 * Zero on success, error code on failure.
350 */
351int drm_object_property_get_value(struct drm_mode_object *obj,
352 struct drm_property *property, uint64_t *val)
353{
354 WARN_ON(drm_drv_uses_atomic_modeset(property->dev));
355
356 return __drm_object_property_get_value(obj, property, val);
357}
358EXPORT_SYMBOL(drm_object_property_get_value);
359
360/**
361 * drm_object_property_get_default_value - retrieve the default value of a
362 * property when in atomic mode.
363 * @obj: drm mode object to get property value from
364 * @property: property to retrieve
365 * @val: storage for the property value
366 *
367 * This function retrieves the default state of the given property as passed in
368 * to drm_object_attach_property
369 *
370 * Only atomic drivers should call this function directly, as for non-atomic
371 * drivers it will return the current value.
372 *
373 * Returns:
374 * Zero on success, error code on failure.
375 */
376int drm_object_property_get_default_value(struct drm_mode_object *obj,
377 struct drm_property *property,
378 uint64_t *val)
379{
380 WARN_ON(!drm_drv_uses_atomic_modeset(property->dev));
381
382 return __drm_object_property_get_prop_value(obj, property, val);
383}
384EXPORT_SYMBOL(drm_object_property_get_default_value);
385
386/* helper for getconnector and getproperties ioctls */
387int drm_mode_object_get_properties(struct drm_mode_object *obj, bool atomic,
388 uint32_t __user *prop_ptr,
389 uint64_t __user *prop_values,
390 uint32_t *arg_count_props)
391{
392 int i, ret, count;
393
394 for (i = 0, count = 0; i < obj->properties->count; i++) {
395 struct drm_property *prop = obj->properties->properties[i];
396 uint64_t val;
397
398 if ((prop->flags & DRM_MODE_PROP_ATOMIC) && !atomic)
399 continue;
400
401 if (*arg_count_props > count) {
402 ret = __drm_object_property_get_value(obj, prop, &val);
403 if (ret)
404 return ret;
405
406 if (put_user(prop->base.id, prop_ptr + count))
407 return -EFAULT;
408
409 if (put_user(val, prop_values + count))
410 return -EFAULT;
411 }
412
413 count++;
414 }
415 *arg_count_props = count;
416
417 return 0;
418}
419
420/**
421 * drm_mode_obj_get_properties_ioctl - get the current value of a object's property
422 * @dev: DRM device
423 * @data: ioctl data
424 * @file_priv: DRM file info
425 *
426 * This function retrieves the current value for an object's property. Compared
427 * to the connector specific ioctl this one is extended to also work on crtc and
428 * plane objects.
429 *
430 * Called by the user via ioctl.
431 *
432 * Returns:
433 * Zero on success, negative errno on failure.
434 */
435int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data,
436 struct drm_file *file_priv)
437{
438 struct drm_mode_obj_get_properties *arg = data;
439 struct drm_mode_object *obj;
440 struct drm_modeset_acquire_ctx ctx;
441 int ret = 0;
442
443 if (!drm_core_check_feature(dev, DRIVER_MODESET))
444 return -EOPNOTSUPP;
445
446 DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
447
448 obj = drm_mode_object_find(dev, file_priv, arg->obj_id, arg->obj_type);
449 if (!obj) {
450 ret = -ENOENT;
451 goto out;
452 }
453 if (!obj->properties) {
454 ret = -EINVAL;
455 goto out_unref;
456 }
457
458 ret = drm_mode_object_get_properties(obj, file_priv->atomic,
459 (uint32_t __user *)(unsigned long)(arg->props_ptr),
460 (uint64_t __user *)(unsigned long)(arg->prop_values_ptr),
461 &arg->count_props);
462
463out_unref:
464 drm_mode_object_put(obj);
465out:
466 DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
467 return ret;
468}
469
470struct drm_property *drm_mode_obj_find_prop_id(struct drm_mode_object *obj,
471 uint32_t prop_id)
472{
473 int i;
474
475 for (i = 0; i < obj->properties->count; i++)
476 if (obj->properties->properties[i]->base.id == prop_id)
477 return obj->properties->properties[i];
478
479 return NULL;
480}
481
482static int set_property_legacy(struct drm_mode_object *obj,
483 struct drm_property *prop,
484 uint64_t prop_value)
485{
486 struct drm_device *dev = prop->dev;
487 struct drm_mode_object *ref;
488 struct drm_modeset_acquire_ctx ctx;
489 int ret = -EINVAL;
490
491 if (!drm_property_change_valid_get(prop, prop_value, &ref))
492 return -EINVAL;
493
494 DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
495 switch (obj->type) {
496 case DRM_MODE_OBJECT_CONNECTOR:
497 ret = drm_connector_set_obj_prop(obj, prop, prop_value);
498 break;
499 case DRM_MODE_OBJECT_CRTC:
500 ret = drm_mode_crtc_set_obj_prop(obj, prop, prop_value);
501 break;
502 case DRM_MODE_OBJECT_PLANE:
503 ret = drm_mode_plane_set_obj_prop(obj_to_plane(obj),
504 prop, prop_value);
505 break;
506 }
507 drm_property_change_valid_put(prop, ref);
508 DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
509
510 return ret;
511}
512
513static int set_property_atomic(struct drm_mode_object *obj,
514 struct drm_file *file_priv,
515 struct drm_property *prop,
516 uint64_t prop_value)
517{
518 struct drm_device *dev = prop->dev;
519 struct drm_atomic_state *state;
520 struct drm_modeset_acquire_ctx ctx;
521 int ret;
522
523 state = drm_atomic_state_alloc(dev);
524 if (!state)
525 return -ENOMEM;
526
527 drm_modeset_acquire_init(&ctx, 0);
528 state->acquire_ctx = &ctx;
529
530retry:
531 if (prop == state->dev->mode_config.dpms_property) {
532 if (obj->type != DRM_MODE_OBJECT_CONNECTOR) {
533 ret = -EINVAL;
534 goto out;
535 }
536
537 ret = drm_atomic_connector_commit_dpms(state,
538 obj_to_connector(obj),
539 prop_value);
540 } else {
541 ret = drm_atomic_set_property(state, file_priv, obj, prop, prop_value, false);
542 if (ret)
543 goto out;
544 ret = drm_atomic_commit(state);
545 }
546out:
547 if (ret == -EDEADLK) {
548 drm_atomic_state_clear(state);
549 drm_modeset_backoff(&ctx);
550 goto retry;
551 }
552
553 drm_atomic_state_put(state);
554
555 drm_modeset_drop_locks(&ctx);
556 drm_modeset_acquire_fini(&ctx);
557
558 return ret;
559}
560
561int drm_mode_obj_set_property_ioctl(struct drm_device *dev, void *data,
562 struct drm_file *file_priv)
563{
564 struct drm_mode_obj_set_property *arg = data;
565 struct drm_mode_object *arg_obj;
566 struct drm_property *property;
567 int ret = -EINVAL;
568
569 if (!drm_core_check_feature(dev, DRIVER_MODESET))
570 return -EOPNOTSUPP;
571
572 arg_obj = drm_mode_object_find(dev, file_priv, arg->obj_id, arg->obj_type);
573 if (!arg_obj)
574 return -ENOENT;
575
576 if (!arg_obj->properties)
577 goto out_unref;
578
579 property = drm_mode_obj_find_prop_id(arg_obj, arg->prop_id);
580 if (!property)
581 goto out_unref;
582
583 if (drm_drv_uses_atomic_modeset(property->dev))
584 ret = set_property_atomic(arg_obj, file_priv, property, arg->value);
585 else
586 ret = set_property_legacy(arg_obj, property, arg->value);
587
588out_unref:
589 drm_mode_object_put(arg_obj);
590 return ret;
591}
1/*
2 * Copyright (c) 2016 Intel Corporation
3 *
4 * Permission to use, copy, modify, distribute, and sell this software and its
5 * documentation for any purpose is hereby granted without fee, provided that
6 * the above copyright notice appear in all copies and that both that copyright
7 * notice and this permission notice appear in supporting documentation, and
8 * that the name of the copyright holders not be used in advertising or
9 * publicity pertaining to distribution of the software without specific,
10 * written prior permission. The copyright holders make no representations
11 * about the suitability of this software for any purpose. It is provided "as
12 * is" without express or implied warranty.
13 *
14 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
15 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
16 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
17 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
18 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
19 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
20 * OF THIS SOFTWARE.
21 */
22
23#include <linux/export.h>
24#include <drm/drmP.h>
25#include <drm/drm_mode_object.h>
26
27#include "drm_crtc_internal.h"
28
29/*
30 * Internal function to assign a slot in the object idr and optionally
31 * register the object into the idr.
32 */
33int drm_mode_object_get_reg(struct drm_device *dev,
34 struct drm_mode_object *obj,
35 uint32_t obj_type,
36 bool register_obj,
37 void (*obj_free_cb)(struct kref *kref))
38{
39 int ret;
40
41 mutex_lock(&dev->mode_config.idr_mutex);
42 ret = idr_alloc(&dev->mode_config.crtc_idr, register_obj ? obj : NULL, 1, 0, GFP_KERNEL);
43 if (ret >= 0) {
44 /*
45 * Set up the object linking under the protection of the idr
46 * lock so that other users can't see inconsistent state.
47 */
48 obj->id = ret;
49 obj->type = obj_type;
50 if (obj_free_cb) {
51 obj->free_cb = obj_free_cb;
52 kref_init(&obj->refcount);
53 }
54 }
55 mutex_unlock(&dev->mode_config.idr_mutex);
56
57 return ret < 0 ? ret : 0;
58}
59
60/**
61 * drm_mode_object_get - allocate a new modeset identifier
62 * @dev: DRM device
63 * @obj: object pointer, used to generate unique ID
64 * @obj_type: object type
65 *
66 * Create a unique identifier based on @ptr in @dev's identifier space. Used
67 * for tracking modes, CRTCs and connectors. Note that despite the _get postfix
68 * modeset identifiers are _not_ reference counted. Hence don't use this for
69 * reference counted modeset objects like framebuffers.
70 *
71 * Returns:
72 * Zero on success, error code on failure.
73 */
74int drm_mode_object_get(struct drm_device *dev,
75 struct drm_mode_object *obj, uint32_t obj_type)
76{
77 return drm_mode_object_get_reg(dev, obj, obj_type, true, NULL);
78}
79
80void drm_mode_object_register(struct drm_device *dev,
81 struct drm_mode_object *obj)
82{
83 mutex_lock(&dev->mode_config.idr_mutex);
84 idr_replace(&dev->mode_config.crtc_idr, obj, obj->id);
85 mutex_unlock(&dev->mode_config.idr_mutex);
86}
87
88/**
89 * drm_mode_object_unregister - free a modeset identifer
90 * @dev: DRM device
91 * @object: object to free
92 *
93 * Free @id from @dev's unique identifier pool.
94 * This function can be called multiple times, and guards against
95 * multiple removals.
96 * These modeset identifiers are _not_ reference counted. Hence don't use this
97 * for reference counted modeset objects like framebuffers.
98 */
99void drm_mode_object_unregister(struct drm_device *dev,
100 struct drm_mode_object *object)
101{
102 mutex_lock(&dev->mode_config.idr_mutex);
103 if (object->id) {
104 idr_remove(&dev->mode_config.crtc_idr, object->id);
105 object->id = 0;
106 }
107 mutex_unlock(&dev->mode_config.idr_mutex);
108}
109
110struct drm_mode_object *__drm_mode_object_find(struct drm_device *dev,
111 uint32_t id, uint32_t type)
112{
113 struct drm_mode_object *obj = NULL;
114
115 mutex_lock(&dev->mode_config.idr_mutex);
116 obj = idr_find(&dev->mode_config.crtc_idr, id);
117 if (obj && type != DRM_MODE_OBJECT_ANY && obj->type != type)
118 obj = NULL;
119 if (obj && obj->id != id)
120 obj = NULL;
121
122 if (obj && obj->free_cb) {
123 if (!kref_get_unless_zero(&obj->refcount))
124 obj = NULL;
125 }
126 mutex_unlock(&dev->mode_config.idr_mutex);
127
128 return obj;
129}
130
131/**
132 * drm_mode_object_find - look up a drm object with static lifetime
133 * @dev: drm device
134 * @id: id of the mode object
135 * @type: type of the mode object
136 *
137 * This function is used to look up a modeset object. It will acquire a
138 * reference for reference counted objects. This reference must be dropped again
139 * by callind drm_mode_object_unreference().
140 */
141struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
142 uint32_t id, uint32_t type)
143{
144 struct drm_mode_object *obj = NULL;
145
146 obj = __drm_mode_object_find(dev, id, type);
147 return obj;
148}
149EXPORT_SYMBOL(drm_mode_object_find);
150
151/**
152 * drm_mode_object_unreference - decr the object refcnt
153 * @obj: mode_object
154 *
155 * This function decrements the object's refcount if it is a refcounted modeset
156 * object. It is a no-op on any other object. This is used to drop references
157 * acquired with drm_mode_object_reference().
158 */
159void drm_mode_object_unreference(struct drm_mode_object *obj)
160{
161 if (obj->free_cb) {
162 DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, atomic_read(&obj->refcount.refcount));
163 kref_put(&obj->refcount, obj->free_cb);
164 }
165}
166EXPORT_SYMBOL(drm_mode_object_unreference);
167
168/**
169 * drm_mode_object_reference - incr the object refcnt
170 * @obj: mode_object
171 *
172 * This function increments the object's refcount if it is a refcounted modeset
173 * object. It is a no-op on any other object. References should be dropped again
174 * by calling drm_mode_object_unreference().
175 */
176void drm_mode_object_reference(struct drm_mode_object *obj)
177{
178 if (obj->free_cb) {
179 DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, atomic_read(&obj->refcount.refcount));
180 kref_get(&obj->refcount);
181 }
182}
183EXPORT_SYMBOL(drm_mode_object_reference);
184
185/**
186 * drm_object_attach_property - attach a property to a modeset object
187 * @obj: drm modeset object
188 * @property: property to attach
189 * @init_val: initial value of the property
190 *
191 * This attaches the given property to the modeset object with the given initial
192 * value. Currently this function cannot fail since the properties are stored in
193 * a statically sized array.
194 */
195void drm_object_attach_property(struct drm_mode_object *obj,
196 struct drm_property *property,
197 uint64_t init_val)
198{
199 int count = obj->properties->count;
200
201 if (count == DRM_OBJECT_MAX_PROPERTY) {
202 WARN(1, "Failed to attach object property (type: 0x%x). Please "
203 "increase DRM_OBJECT_MAX_PROPERTY by 1 for each time "
204 "you see this message on the same object type.\n",
205 obj->type);
206 return;
207 }
208
209 obj->properties->properties[count] = property;
210 obj->properties->values[count] = init_val;
211 obj->properties->count++;
212}
213EXPORT_SYMBOL(drm_object_attach_property);
214
215/**
216 * drm_object_property_set_value - set the value of a property
217 * @obj: drm mode object to set property value for
218 * @property: property to set
219 * @val: value the property should be set to
220 *
221 * This function sets a given property on a given object. This function only
222 * changes the software state of the property, it does not call into the
223 * driver's ->set_property callback.
224 *
225 * Note that atomic drivers should not have any need to call this, the core will
226 * ensure consistency of values reported back to userspace through the
227 * appropriate ->atomic_get_property callback. Only legacy drivers should call
228 * this function to update the tracked value (after clamping and other
229 * restrictions have been applied).
230 *
231 * Returns:
232 * Zero on success, error code on failure.
233 */
234int drm_object_property_set_value(struct drm_mode_object *obj,
235 struct drm_property *property, uint64_t val)
236{
237 int i;
238
239 for (i = 0; i < obj->properties->count; i++) {
240 if (obj->properties->properties[i] == property) {
241 obj->properties->values[i] = val;
242 return 0;
243 }
244 }
245
246 return -EINVAL;
247}
248EXPORT_SYMBOL(drm_object_property_set_value);
249
250/**
251 * drm_object_property_get_value - retrieve the value of a property
252 * @obj: drm mode object to get property value from
253 * @property: property to retrieve
254 * @val: storage for the property value
255 *
256 * This function retrieves the softare state of the given property for the given
257 * property. Since there is no driver callback to retrieve the current property
258 * value this might be out of sync with the hardware, depending upon the driver
259 * and property.
260 *
261 * Atomic drivers should never call this function directly, the core will read
262 * out property values through the various ->atomic_get_property callbacks.
263 *
264 * Returns:
265 * Zero on success, error code on failure.
266 */
267int drm_object_property_get_value(struct drm_mode_object *obj,
268 struct drm_property *property, uint64_t *val)
269{
270 int i;
271
272 /* read-only properties bypass atomic mechanism and still store
273 * their value in obj->properties->values[].. mostly to avoid
274 * having to deal w/ EDID and similar props in atomic paths:
275 */
276 if (drm_core_check_feature(property->dev, DRIVER_ATOMIC) &&
277 !(property->flags & DRM_MODE_PROP_IMMUTABLE))
278 return drm_atomic_get_property(obj, property, val);
279
280 for (i = 0; i < obj->properties->count; i++) {
281 if (obj->properties->properties[i] == property) {
282 *val = obj->properties->values[i];
283 return 0;
284 }
285
286 }
287
288 return -EINVAL;
289}
290EXPORT_SYMBOL(drm_object_property_get_value);
291
292/* helper for getconnector and getproperties ioctls */
293int drm_mode_object_get_properties(struct drm_mode_object *obj, bool atomic,
294 uint32_t __user *prop_ptr,
295 uint64_t __user *prop_values,
296 uint32_t *arg_count_props)
297{
298 int i, ret, count;
299
300 for (i = 0, count = 0; i < obj->properties->count; i++) {
301 struct drm_property *prop = obj->properties->properties[i];
302 uint64_t val;
303
304 if ((prop->flags & DRM_MODE_PROP_ATOMIC) && !atomic)
305 continue;
306
307 if (*arg_count_props > count) {
308 ret = drm_object_property_get_value(obj, prop, &val);
309 if (ret)
310 return ret;
311
312 if (put_user(prop->base.id, prop_ptr + count))
313 return -EFAULT;
314
315 if (put_user(val, prop_values + count))
316 return -EFAULT;
317 }
318
319 count++;
320 }
321 *arg_count_props = count;
322
323 return 0;
324}
325
326/**
327 * drm_mode_obj_get_properties_ioctl - get the current value of a object's property
328 * @dev: DRM device
329 * @data: ioctl data
330 * @file_priv: DRM file info
331 *
332 * This function retrieves the current value for an object's property. Compared
333 * to the connector specific ioctl this one is extended to also work on crtc and
334 * plane objects.
335 *
336 * Called by the user via ioctl.
337 *
338 * Returns:
339 * Zero on success, negative errno on failure.
340 */
341int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data,
342 struct drm_file *file_priv)
343{
344 struct drm_mode_obj_get_properties *arg = data;
345 struct drm_mode_object *obj;
346 int ret = 0;
347
348 if (!drm_core_check_feature(dev, DRIVER_MODESET))
349 return -EINVAL;
350
351 drm_modeset_lock_all(dev);
352
353 obj = drm_mode_object_find(dev, arg->obj_id, arg->obj_type);
354 if (!obj) {
355 ret = -ENOENT;
356 goto out;
357 }
358 if (!obj->properties) {
359 ret = -EINVAL;
360 goto out_unref;
361 }
362
363 ret = drm_mode_object_get_properties(obj, file_priv->atomic,
364 (uint32_t __user *)(unsigned long)(arg->props_ptr),
365 (uint64_t __user *)(unsigned long)(arg->prop_values_ptr),
366 &arg->count_props);
367
368out_unref:
369 drm_mode_object_unreference(obj);
370out:
371 drm_modeset_unlock_all(dev);
372 return ret;
373}
374
375struct drm_property *drm_mode_obj_find_prop_id(struct drm_mode_object *obj,
376 uint32_t prop_id)
377{
378 int i;
379
380 for (i = 0; i < obj->properties->count; i++)
381 if (obj->properties->properties[i]->base.id == prop_id)
382 return obj->properties->properties[i];
383
384 return NULL;
385}
386
387int drm_mode_obj_set_property_ioctl(struct drm_device *dev, void *data,
388 struct drm_file *file_priv)
389{
390 struct drm_mode_obj_set_property *arg = data;
391 struct drm_mode_object *arg_obj;
392 struct drm_property *property;
393 int ret = -EINVAL;
394 struct drm_mode_object *ref;
395
396 if (!drm_core_check_feature(dev, DRIVER_MODESET))
397 return -EINVAL;
398
399 drm_modeset_lock_all(dev);
400
401 arg_obj = drm_mode_object_find(dev, arg->obj_id, arg->obj_type);
402 if (!arg_obj) {
403 ret = -ENOENT;
404 goto out;
405 }
406
407 if (!arg_obj->properties)
408 goto out_unref;
409
410 property = drm_mode_obj_find_prop_id(arg_obj, arg->prop_id);
411 if (!property)
412 goto out_unref;
413
414 if (!drm_property_change_valid_get(property, arg->value, &ref))
415 goto out_unref;
416
417 switch (arg_obj->type) {
418 case DRM_MODE_OBJECT_CONNECTOR:
419 ret = drm_mode_connector_set_obj_prop(arg_obj, property,
420 arg->value);
421 break;
422 case DRM_MODE_OBJECT_CRTC:
423 ret = drm_mode_crtc_set_obj_prop(arg_obj, property, arg->value);
424 break;
425 case DRM_MODE_OBJECT_PLANE:
426 ret = drm_mode_plane_set_obj_prop(obj_to_plane(arg_obj),
427 property, arg->value);
428 break;
429 }
430
431 drm_property_change_valid_put(property, ref);
432
433out_unref:
434 drm_mode_object_unreference(arg_obj);
435out:
436 drm_modeset_unlock_all(dev);
437 return ret;
438}