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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 identifer
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_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 obj = NULL;
152
153 if (obj && obj->free_cb) {
154 if (!kref_get_unless_zero(&obj->refcount))
155 obj = NULL;
156 }
157 mutex_unlock(&dev->mode_config.idr_mutex);
158
159 return obj;
160}
161
162/**
163 * drm_mode_object_find - look up a drm object with static lifetime
164 * @dev: drm device
165 * @file_priv: drm file
166 * @id: id of the mode object
167 * @type: type of the mode object
168 *
169 * This function is used to look up a modeset object. It will acquire a
170 * reference for reference counted objects. This reference must be dropped again
171 * by callind drm_mode_object_put().
172 */
173struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
174 struct drm_file *file_priv,
175 uint32_t id, uint32_t type)
176{
177 struct drm_mode_object *obj = NULL;
178
179 obj = __drm_mode_object_find(dev, file_priv, id, type);
180 return obj;
181}
182EXPORT_SYMBOL(drm_mode_object_find);
183
184/**
185 * drm_mode_object_put - release a mode object reference
186 * @obj: DRM mode object
187 *
188 * This function decrements the object's refcount if it is a refcounted modeset
189 * object. It is a no-op on any other object. This is used to drop references
190 * acquired with drm_mode_object_get().
191 */
192void drm_mode_object_put(struct drm_mode_object *obj)
193{
194 if (obj->free_cb) {
195 DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount));
196 kref_put(&obj->refcount, obj->free_cb);
197 }
198}
199EXPORT_SYMBOL(drm_mode_object_put);
200
201/**
202 * drm_mode_object_get - acquire a mode object reference
203 * @obj: DRM mode object
204 *
205 * This function increments the object's refcount if it is a refcounted modeset
206 * object. It is a no-op on any other object. References should be dropped again
207 * by calling drm_mode_object_put().
208 */
209void drm_mode_object_get(struct drm_mode_object *obj)
210{
211 if (obj->free_cb) {
212 DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount));
213 kref_get(&obj->refcount);
214 }
215}
216EXPORT_SYMBOL(drm_mode_object_get);
217
218/**
219 * drm_object_attach_property - attach a property to a modeset object
220 * @obj: drm modeset object
221 * @property: property to attach
222 * @init_val: initial value of the property
223 *
224 * This attaches the given property to the modeset object with the given initial
225 * value. Currently this function cannot fail since the properties are stored in
226 * a statically sized array.
227 */
228void drm_object_attach_property(struct drm_mode_object *obj,
229 struct drm_property *property,
230 uint64_t init_val)
231{
232 int count = obj->properties->count;
233
234 if (count == DRM_OBJECT_MAX_PROPERTY) {
235 WARN(1, "Failed to attach object property (type: 0x%x). Please "
236 "increase DRM_OBJECT_MAX_PROPERTY by 1 for each time "
237 "you see this message on the same object type.\n",
238 obj->type);
239 return;
240 }
241
242 obj->properties->properties[count] = property;
243 obj->properties->values[count] = init_val;
244 obj->properties->count++;
245}
246EXPORT_SYMBOL(drm_object_attach_property);
247
248/**
249 * drm_object_property_set_value - set the value of a property
250 * @obj: drm mode object to set property value for
251 * @property: property to set
252 * @val: value the property should be set to
253 *
254 * This function sets a given property on a given object. This function only
255 * changes the software state of the property, it does not call into the
256 * driver's ->set_property callback.
257 *
258 * Note that atomic drivers should not have any need to call this, the core will
259 * ensure consistency of values reported back to userspace through the
260 * appropriate ->atomic_get_property callback. Only legacy drivers should call
261 * this function to update the tracked value (after clamping and other
262 * restrictions have been applied).
263 *
264 * Returns:
265 * Zero on success, error code on failure.
266 */
267int drm_object_property_set_value(struct drm_mode_object *obj,
268 struct drm_property *property, uint64_t val)
269{
270 int i;
271
272 WARN_ON(drm_drv_uses_atomic_modeset(property->dev) &&
273 !(property->flags & DRM_MODE_PROP_IMMUTABLE));
274
275 for (i = 0; i < obj->properties->count; i++) {
276 if (obj->properties->properties[i] == property) {
277 obj->properties->values[i] = val;
278 return 0;
279 }
280 }
281
282 return -EINVAL;
283}
284EXPORT_SYMBOL(drm_object_property_set_value);
285
286static int __drm_object_property_get_value(struct drm_mode_object *obj,
287 struct drm_property *property,
288 uint64_t *val)
289{
290 int i;
291
292 /* read-only properties bypass atomic mechanism and still store
293 * their value in obj->properties->values[].. mostly to avoid
294 * having to deal w/ EDID and similar props in atomic paths:
295 */
296 if (drm_drv_uses_atomic_modeset(property->dev) &&
297 !(property->flags & DRM_MODE_PROP_IMMUTABLE))
298 return drm_atomic_get_property(obj, property, val);
299
300 for (i = 0; i < obj->properties->count; i++) {
301 if (obj->properties->properties[i] == property) {
302 *val = obj->properties->values[i];
303 return 0;
304 }
305
306 }
307
308 return -EINVAL;
309}
310
311/**
312 * drm_object_property_get_value - retrieve the value of a property
313 * @obj: drm mode object to get property value from
314 * @property: property to retrieve
315 * @val: storage for the property value
316 *
317 * This function retrieves the softare state of the given property for the given
318 * property. Since there is no driver callback to retrieve the current property
319 * value this might be out of sync with the hardware, depending upon the driver
320 * and property.
321 *
322 * Atomic drivers should never call this function directly, the core will read
323 * out property values through the various ->atomic_get_property callbacks.
324 *
325 * Returns:
326 * Zero on success, error code on failure.
327 */
328int drm_object_property_get_value(struct drm_mode_object *obj,
329 struct drm_property *property, uint64_t *val)
330{
331 WARN_ON(drm_drv_uses_atomic_modeset(property->dev));
332
333 return __drm_object_property_get_value(obj, property, val);
334}
335EXPORT_SYMBOL(drm_object_property_get_value);
336
337/* helper for getconnector and getproperties ioctls */
338int drm_mode_object_get_properties(struct drm_mode_object *obj, bool atomic,
339 uint32_t __user *prop_ptr,
340 uint64_t __user *prop_values,
341 uint32_t *arg_count_props)
342{
343 int i, ret, count;
344
345 for (i = 0, count = 0; i < obj->properties->count; i++) {
346 struct drm_property *prop = obj->properties->properties[i];
347 uint64_t val;
348
349 if ((prop->flags & DRM_MODE_PROP_ATOMIC) && !atomic)
350 continue;
351
352 if (*arg_count_props > count) {
353 ret = __drm_object_property_get_value(obj, prop, &val);
354 if (ret)
355 return ret;
356
357 if (put_user(prop->base.id, prop_ptr + count))
358 return -EFAULT;
359
360 if (put_user(val, prop_values + count))
361 return -EFAULT;
362 }
363
364 count++;
365 }
366 *arg_count_props = count;
367
368 return 0;
369}
370
371/**
372 * drm_mode_obj_get_properties_ioctl - get the current value of a object's property
373 * @dev: DRM device
374 * @data: ioctl data
375 * @file_priv: DRM file info
376 *
377 * This function retrieves the current value for an object's property. Compared
378 * to the connector specific ioctl this one is extended to also work on crtc and
379 * plane objects.
380 *
381 * Called by the user via ioctl.
382 *
383 * Returns:
384 * Zero on success, negative errno on failure.
385 */
386int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data,
387 struct drm_file *file_priv)
388{
389 struct drm_mode_obj_get_properties *arg = data;
390 struct drm_mode_object *obj;
391 int ret = 0;
392
393 if (!drm_core_check_feature(dev, DRIVER_MODESET))
394 return -EOPNOTSUPP;
395
396 drm_modeset_lock_all(dev);
397
398 obj = drm_mode_object_find(dev, file_priv, arg->obj_id, arg->obj_type);
399 if (!obj) {
400 ret = -ENOENT;
401 goto out;
402 }
403 if (!obj->properties) {
404 ret = -EINVAL;
405 goto out_unref;
406 }
407
408 ret = drm_mode_object_get_properties(obj, file_priv->atomic,
409 (uint32_t __user *)(unsigned long)(arg->props_ptr),
410 (uint64_t __user *)(unsigned long)(arg->prop_values_ptr),
411 &arg->count_props);
412
413out_unref:
414 drm_mode_object_put(obj);
415out:
416 drm_modeset_unlock_all(dev);
417 return ret;
418}
419
420struct drm_property *drm_mode_obj_find_prop_id(struct drm_mode_object *obj,
421 uint32_t prop_id)
422{
423 int i;
424
425 for (i = 0; i < obj->properties->count; i++)
426 if (obj->properties->properties[i]->base.id == prop_id)
427 return obj->properties->properties[i];
428
429 return NULL;
430}
431
432static int set_property_legacy(struct drm_mode_object *obj,
433 struct drm_property *prop,
434 uint64_t prop_value)
435{
436 struct drm_device *dev = prop->dev;
437 struct drm_mode_object *ref;
438 int ret = -EINVAL;
439
440 if (!drm_property_change_valid_get(prop, prop_value, &ref))
441 return -EINVAL;
442
443 drm_modeset_lock_all(dev);
444 switch (obj->type) {
445 case DRM_MODE_OBJECT_CONNECTOR:
446 ret = drm_connector_set_obj_prop(obj, prop, prop_value);
447 break;
448 case DRM_MODE_OBJECT_CRTC:
449 ret = drm_mode_crtc_set_obj_prop(obj, prop, prop_value);
450 break;
451 case DRM_MODE_OBJECT_PLANE:
452 ret = drm_mode_plane_set_obj_prop(obj_to_plane(obj),
453 prop, prop_value);
454 break;
455 }
456 drm_property_change_valid_put(prop, ref);
457 drm_modeset_unlock_all(dev);
458
459 return ret;
460}
461
462static int set_property_atomic(struct drm_mode_object *obj,
463 struct drm_file *file_priv,
464 struct drm_property *prop,
465 uint64_t prop_value)
466{
467 struct drm_device *dev = prop->dev;
468 struct drm_atomic_state *state;
469 struct drm_modeset_acquire_ctx ctx;
470 int ret;
471
472 state = drm_atomic_state_alloc(dev);
473 if (!state)
474 return -ENOMEM;
475
476 drm_modeset_acquire_init(&ctx, 0);
477 state->acquire_ctx = &ctx;
478
479retry:
480 if (prop == state->dev->mode_config.dpms_property) {
481 if (obj->type != DRM_MODE_OBJECT_CONNECTOR) {
482 ret = -EINVAL;
483 goto out;
484 }
485
486 ret = drm_atomic_connector_commit_dpms(state,
487 obj_to_connector(obj),
488 prop_value);
489 } else {
490 ret = drm_atomic_set_property(state, file_priv, obj, prop, prop_value);
491 if (ret)
492 goto out;
493 ret = drm_atomic_commit(state);
494 }
495out:
496 if (ret == -EDEADLK) {
497 drm_atomic_state_clear(state);
498 drm_modeset_backoff(&ctx);
499 goto retry;
500 }
501
502 drm_atomic_state_put(state);
503
504 drm_modeset_drop_locks(&ctx);
505 drm_modeset_acquire_fini(&ctx);
506
507 return ret;
508}
509
510int drm_mode_obj_set_property_ioctl(struct drm_device *dev, void *data,
511 struct drm_file *file_priv)
512{
513 struct drm_mode_obj_set_property *arg = data;
514 struct drm_mode_object *arg_obj;
515 struct drm_property *property;
516 int ret = -EINVAL;
517
518 if (!drm_core_check_feature(dev, DRIVER_MODESET))
519 return -EOPNOTSUPP;
520
521 arg_obj = drm_mode_object_find(dev, file_priv, arg->obj_id, arg->obj_type);
522 if (!arg_obj)
523 return -ENOENT;
524
525 if (!arg_obj->properties)
526 goto out_unref;
527
528 property = drm_mode_obj_find_prop_id(arg_obj, arg->prop_id);
529 if (!property)
530 goto out_unref;
531
532 if (drm_drv_uses_atomic_modeset(property->dev))
533 ret = set_property_atomic(arg_obj, file_priv, property, arg->value);
534 else
535 ret = set_property_legacy(arg_obj, property, arg->value);
536
537out_unref:
538 drm_mode_object_put(arg_obj);
539 return ret;
540}
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}