2 * Copyright (c) 2016 Intel Corporation
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.
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
23 #include <linux/export.h>
24 #include <linux/uaccess.h>
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>
33 #include "drm_crtc_internal.h"
36 * Internal function to assign a slot in the object idr and optionally
37 * register the object into the idr.
39 int __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))
45 WARN_ON(!dev->driver->load && dev->registered && !obj_free_cb);
47 mutex_lock(&dev->mode_config.idr_mutex);
48 ret = idr_alloc(&dev->mode_config.object_idr, register_obj ? obj : NULL,
52 * Set up the object linking under the protection of the idr
53 * lock so that other users can't see inconsistent state.
58 obj->free_cb = obj_free_cb;
59 kref_init(&obj->refcount);
62 mutex_unlock(&dev->mode_config.idr_mutex);
64 return ret < 0 ? ret : 0;
68 * drm_mode_object_add - allocate a new modeset identifier
70 * @obj: object pointer, used to generate unique ID
71 * @obj_type: object type
73 * Create a unique identifier based on @ptr in @dev's identifier space. Used
74 * for tracking modes, CRTCs and connectors.
77 * Zero on success, error code on failure.
79 int drm_mode_object_add(struct drm_device *dev,
80 struct drm_mode_object *obj, uint32_t obj_type)
82 return __drm_mode_object_add(dev, obj, obj_type, true, NULL);
85 void drm_mode_object_register(struct drm_device *dev,
86 struct drm_mode_object *obj)
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);
94 * drm_mode_object_unregister - free a modeset identifier
96 * @object: object to free
98 * Free @id from @dev's unique identifier pool.
99 * This function can be called multiple times, and guards against
101 * These modeset identifiers are _not_ reference counted. Hence don't use this
102 * for reference counted modeset objects like framebuffers.
104 void drm_mode_object_unregister(struct drm_device *dev,
105 struct drm_mode_object *object)
107 WARN_ON(!dev->driver->load && dev->registered && !object->free_cb);
109 mutex_lock(&dev->mode_config.idr_mutex);
111 idr_remove(&dev->mode_config.object_idr, object->id);
114 mutex_unlock(&dev->mode_config.idr_mutex);
118 * drm_mode_object_lease_required - check types which must be leased to be used
119 * @type: type of object
121 * Returns whether the provided type of drm_mode_object must
122 * be owned or leased to be used by a process.
124 bool drm_mode_object_lease_required(uint32_t type)
127 case DRM_MODE_OBJECT_CRTC:
128 case DRM_MODE_OBJECT_CONNECTOR:
129 case DRM_MODE_OBJECT_PLANE:
136 struct drm_mode_object *__drm_mode_object_find(struct drm_device *dev,
137 struct drm_file *file_priv,
138 uint32_t id, uint32_t type)
140 struct drm_mode_object *obj = NULL;
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)
146 if (obj && obj->id != id)
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);
155 if (obj && obj->free_cb) {
156 if (!kref_get_unless_zero(&obj->refcount))
159 mutex_unlock(&dev->mode_config.idr_mutex);
165 * drm_mode_object_find - look up a drm object with static lifetime
167 * @file_priv: drm file
168 * @id: id of the mode object
169 * @type: type of the mode object
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().
175 struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
176 struct drm_file *file_priv,
177 uint32_t id, uint32_t type)
179 struct drm_mode_object *obj = NULL;
181 obj = __drm_mode_object_find(dev, file_priv, id, type);
184 EXPORT_SYMBOL(drm_mode_object_find);
187 * drm_mode_object_put - release a mode object reference
188 * @obj: DRM mode object
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().
194 void drm_mode_object_put(struct drm_mode_object *obj)
197 DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount));
198 kref_put(&obj->refcount, obj->free_cb);
201 EXPORT_SYMBOL(drm_mode_object_put);
204 * drm_mode_object_get - acquire a mode object reference
205 * @obj: DRM mode object
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().
211 void drm_mode_object_get(struct drm_mode_object *obj)
214 DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount));
215 kref_get(&obj->refcount);
218 EXPORT_SYMBOL(drm_mode_object_get);
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
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.
230 * Note that all properties must be attached before the object itself is
231 * registered and accessible from userspace.
233 void drm_object_attach_property(struct drm_mode_object *obj,
234 struct drm_property *property,
237 int count = obj->properties->count;
238 struct drm_device *dev = property->dev;
241 if (obj->type == DRM_MODE_OBJECT_CONNECTOR) {
242 struct drm_connector *connector = obj_to_connector(obj);
244 WARN_ON(!dev->driver->load &&
245 connector->registration_state == DRM_CONNECTOR_REGISTERED);
247 WARN_ON(!dev->driver->load && dev->registered);
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",
258 obj->properties->properties[count] = property;
259 obj->properties->values[count] = init_val;
260 obj->properties->count++;
262 EXPORT_SYMBOL(drm_object_attach_property);
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
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.
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).
281 * Zero on success, error code on failure.
283 int drm_object_property_set_value(struct drm_mode_object *obj,
284 struct drm_property *property, uint64_t val)
288 WARN_ON(drm_drv_uses_atomic_modeset(property->dev) &&
289 !(property->flags & DRM_MODE_PROP_IMMUTABLE));
291 for (i = 0; i < obj->properties->count; i++) {
292 if (obj->properties->properties[i] == property) {
293 obj->properties->values[i] = val;
300 EXPORT_SYMBOL(drm_object_property_set_value);
302 static int __drm_object_property_get_prop_value(struct drm_mode_object *obj,
303 struct drm_property *property,
308 for (i = 0; i < obj->properties->count; i++) {
309 if (obj->properties->properties[i] == property) {
310 *val = obj->properties->values[i];
318 static int __drm_object_property_get_value(struct drm_mode_object *obj,
319 struct drm_property *property,
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:
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);
331 return __drm_object_property_get_prop_value(obj, property, val);
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
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
345 * Atomic drivers should never call this function directly, the core will read
346 * out property values through the various ->atomic_get_property callbacks.
349 * Zero on success, error code on failure.
351 int drm_object_property_get_value(struct drm_mode_object *obj,
352 struct drm_property *property, uint64_t *val)
354 WARN_ON(drm_drv_uses_atomic_modeset(property->dev));
356 return __drm_object_property_get_value(obj, property, val);
358 EXPORT_SYMBOL(drm_object_property_get_value);
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
367 * This function retrieves the default state of the given property as passed in
368 * to drm_object_attach_property
370 * Only atomic drivers should call this function directly, as for non-atomic
371 * drivers it will return the current value.
374 * Zero on success, error code on failure.
376 int drm_object_property_get_default_value(struct drm_mode_object *obj,
377 struct drm_property *property,
380 WARN_ON(!drm_drv_uses_atomic_modeset(property->dev));
382 return __drm_object_property_get_prop_value(obj, property, val);
384 EXPORT_SYMBOL(drm_object_property_get_default_value);
386 /* helper for getconnector and getproperties ioctls */
387 int 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)
394 for (i = 0, count = 0; i < obj->properties->count; i++) {
395 struct drm_property *prop = obj->properties->properties[i];
398 if ((prop->flags & DRM_MODE_PROP_ATOMIC) && !atomic)
401 if (*arg_count_props > count) {
402 ret = __drm_object_property_get_value(obj, prop, &val);
406 if (put_user(prop->base.id, prop_ptr + count))
409 if (put_user(val, prop_values + count))
415 *arg_count_props = count;
421 * drm_mode_obj_get_properties_ioctl - get the current value of a object's property
424 * @file_priv: DRM file info
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
430 * Called by the user via ioctl.
433 * Zero on success, negative errno on failure.
435 int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data,
436 struct drm_file *file_priv)
438 struct drm_mode_obj_get_properties *arg = data;
439 struct drm_mode_object *obj;
440 struct drm_modeset_acquire_ctx ctx;
443 if (!drm_core_check_feature(dev, DRIVER_MODESET))
446 DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
448 obj = drm_mode_object_find(dev, file_priv, arg->obj_id, arg->obj_type);
453 if (!obj->properties) {
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),
464 drm_mode_object_put(obj);
466 DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
470 struct drm_property *drm_mode_obj_find_prop_id(struct drm_mode_object *obj,
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];
482 static int set_property_legacy(struct drm_mode_object *obj,
483 struct drm_property *prop,
486 struct drm_device *dev = prop->dev;
487 struct drm_mode_object *ref;
488 struct drm_modeset_acquire_ctx ctx;
491 if (!drm_property_change_valid_get(prop, prop_value, &ref))
494 DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
496 case DRM_MODE_OBJECT_CONNECTOR:
497 ret = drm_connector_set_obj_prop(obj, prop, prop_value);
499 case DRM_MODE_OBJECT_CRTC:
500 ret = drm_mode_crtc_set_obj_prop(obj, prop, prop_value);
502 case DRM_MODE_OBJECT_PLANE:
503 ret = drm_mode_plane_set_obj_prop(obj_to_plane(obj),
507 drm_property_change_valid_put(prop, ref);
508 DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
513 static int set_property_atomic(struct drm_mode_object *obj,
514 struct drm_file *file_priv,
515 struct drm_property *prop,
518 struct drm_device *dev = prop->dev;
519 struct drm_atomic_state *state;
520 struct drm_modeset_acquire_ctx ctx;
523 state = drm_atomic_state_alloc(dev);
527 drm_modeset_acquire_init(&ctx, 0);
528 state->acquire_ctx = &ctx;
531 if (prop == state->dev->mode_config.dpms_property) {
532 if (obj->type != DRM_MODE_OBJECT_CONNECTOR) {
537 ret = drm_atomic_connector_commit_dpms(state,
538 obj_to_connector(obj),
541 ret = drm_atomic_set_property(state, file_priv, obj, prop, prop_value);
544 ret = drm_atomic_commit(state);
547 if (ret == -EDEADLK) {
548 drm_atomic_state_clear(state);
549 drm_modeset_backoff(&ctx);
553 drm_atomic_state_put(state);
555 drm_modeset_drop_locks(&ctx);
556 drm_modeset_acquire_fini(&ctx);
561 int drm_mode_obj_set_property_ioctl(struct drm_device *dev, void *data,
562 struct drm_file *file_priv)
564 struct drm_mode_obj_set_property *arg = data;
565 struct drm_mode_object *arg_obj;
566 struct drm_property *property;
569 if (!drm_core_check_feature(dev, DRIVER_MODESET))
572 arg_obj = drm_mode_object_find(dev, file_priv, arg->obj_id, arg->obj_type);
576 if (!arg_obj->properties)
579 property = drm_mode_obj_find_prop_id(arg_obj, arg->prop_id);
583 if (drm_drv_uses_atomic_modeset(property->dev))
584 ret = set_property_atomic(arg_obj, file_priv, property, arg->value);
586 ret = set_property_legacy(arg_obj, property, arg->value);
589 drm_mode_object_put(arg_obj);