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);
84 EXPORT_SYMBOL_FOR_TESTS_ONLY(drm_mode_object_add);
86 void drm_mode_object_register(struct drm_device *dev,
87 struct drm_mode_object *obj)
89 mutex_lock(&dev->mode_config.idr_mutex);
90 idr_replace(&dev->mode_config.object_idr, obj, obj->id);
91 mutex_unlock(&dev->mode_config.idr_mutex);
95 * drm_mode_object_unregister - free a modeset identifier
97 * @object: object to free
99 * Free @id from @dev's unique identifier pool.
100 * This function can be called multiple times, and guards against
102 * These modeset identifiers are _not_ reference counted. Hence don't use this
103 * for reference counted modeset objects like framebuffers.
105 void drm_mode_object_unregister(struct drm_device *dev,
106 struct drm_mode_object *object)
108 WARN_ON(!dev->driver->load && dev->registered && !object->free_cb);
110 mutex_lock(&dev->mode_config.idr_mutex);
112 idr_remove(&dev->mode_config.object_idr, object->id);
115 mutex_unlock(&dev->mode_config.idr_mutex);
119 * drm_mode_object_lease_required - check types which must be leased to be used
120 * @type: type of object
122 * Returns whether the provided type of drm_mode_object must
123 * be owned or leased to be used by a process.
125 bool drm_mode_object_lease_required(uint32_t type)
128 case DRM_MODE_OBJECT_CRTC:
129 case DRM_MODE_OBJECT_CONNECTOR:
130 case DRM_MODE_OBJECT_PLANE:
137 struct drm_mode_object *__drm_mode_object_find(struct drm_device *dev,
138 struct drm_file *file_priv,
139 uint32_t id, uint32_t type)
141 struct drm_mode_object *obj = NULL;
143 mutex_lock(&dev->mode_config.idr_mutex);
144 obj = idr_find(&dev->mode_config.object_idr, id);
145 if (obj && type != DRM_MODE_OBJECT_ANY && obj->type != type)
147 if (obj && obj->id != id)
150 if (obj && drm_mode_object_lease_required(obj->type) &&
151 !_drm_lease_held(file_priv, obj->id)) {
152 drm_dbg_kms(dev, "[OBJECT:%d] not included in lease", id);
156 if (obj && obj->free_cb) {
157 if (!kref_get_unless_zero(&obj->refcount))
160 mutex_unlock(&dev->mode_config.idr_mutex);
166 * drm_mode_object_find - look up a drm object with static lifetime
168 * @file_priv: drm file
169 * @id: id of the mode object
170 * @type: type of the mode object
172 * This function is used to look up a modeset object. It will acquire a
173 * reference for reference counted objects. This reference must be dropped again
174 * by callind drm_mode_object_put().
176 struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
177 struct drm_file *file_priv,
178 uint32_t id, uint32_t type)
180 struct drm_mode_object *obj = NULL;
182 obj = __drm_mode_object_find(dev, file_priv, id, type);
185 EXPORT_SYMBOL(drm_mode_object_find);
188 * drm_mode_object_put - release a mode object reference
189 * @obj: DRM mode object
191 * This function decrements the object's refcount if it is a refcounted modeset
192 * object. It is a no-op on any other object. This is used to drop references
193 * acquired with drm_mode_object_get().
195 void drm_mode_object_put(struct drm_mode_object *obj)
198 DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount));
199 kref_put(&obj->refcount, obj->free_cb);
202 EXPORT_SYMBOL(drm_mode_object_put);
205 * drm_mode_object_get - acquire a mode object reference
206 * @obj: DRM mode object
208 * This function increments the object's refcount if it is a refcounted modeset
209 * object. It is a no-op on any other object. References should be dropped again
210 * by calling drm_mode_object_put().
212 void drm_mode_object_get(struct drm_mode_object *obj)
215 DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount));
216 kref_get(&obj->refcount);
219 EXPORT_SYMBOL(drm_mode_object_get);
222 * drm_object_attach_property - attach a property to a modeset object
223 * @obj: drm modeset object
224 * @property: property to attach
225 * @init_val: initial value of the property
227 * This attaches the given property to the modeset object with the given initial
228 * value. Currently this function cannot fail since the properties are stored in
229 * a statically sized array.
231 * Note that all properties must be attached before the object itself is
232 * registered and accessible from userspace.
234 void drm_object_attach_property(struct drm_mode_object *obj,
235 struct drm_property *property,
238 int count = obj->properties->count;
239 struct drm_device *dev = property->dev;
242 if (obj->type == DRM_MODE_OBJECT_CONNECTOR) {
243 struct drm_connector *connector = obj_to_connector(obj);
245 WARN_ON(!dev->driver->load &&
246 connector->registration_state == DRM_CONNECTOR_REGISTERED);
248 WARN_ON(!dev->driver->load && dev->registered);
251 if (count == DRM_OBJECT_MAX_PROPERTY) {
252 WARN(1, "Failed to attach object property (type: 0x%x). Please "
253 "increase DRM_OBJECT_MAX_PROPERTY by 1 for each time "
254 "you see this message on the same object type.\n",
259 obj->properties->properties[count] = property;
260 obj->properties->values[count] = init_val;
261 obj->properties->count++;
263 EXPORT_SYMBOL(drm_object_attach_property);
266 * drm_object_property_set_value - set the value of a property
267 * @obj: drm mode object to set property value for
268 * @property: property to set
269 * @val: value the property should be set to
271 * This function sets a given property on a given object. This function only
272 * changes the software state of the property, it does not call into the
273 * driver's ->set_property callback.
275 * Note that atomic drivers should not have any need to call this, the core will
276 * ensure consistency of values reported back to userspace through the
277 * appropriate ->atomic_get_property callback. Only legacy drivers should call
278 * this function to update the tracked value (after clamping and other
279 * restrictions have been applied).
282 * Zero on success, error code on failure.
284 int drm_object_property_set_value(struct drm_mode_object *obj,
285 struct drm_property *property, uint64_t val)
289 WARN_ON(drm_drv_uses_atomic_modeset(property->dev) &&
290 !(property->flags & DRM_MODE_PROP_IMMUTABLE));
292 for (i = 0; i < obj->properties->count; i++) {
293 if (obj->properties->properties[i] == property) {
294 obj->properties->values[i] = val;
301 EXPORT_SYMBOL(drm_object_property_set_value);
303 static int __drm_object_property_get_prop_value(struct drm_mode_object *obj,
304 struct drm_property *property,
309 for (i = 0; i < obj->properties->count; i++) {
310 if (obj->properties->properties[i] == property) {
311 *val = obj->properties->values[i];
319 static int __drm_object_property_get_value(struct drm_mode_object *obj,
320 struct drm_property *property,
324 /* read-only properties bypass atomic mechanism and still store
325 * their value in obj->properties->values[].. mostly to avoid
326 * having to deal w/ EDID and similar props in atomic paths:
328 if (drm_drv_uses_atomic_modeset(property->dev) &&
329 !(property->flags & DRM_MODE_PROP_IMMUTABLE))
330 return drm_atomic_get_property(obj, property, val);
332 return __drm_object_property_get_prop_value(obj, property, val);
336 * drm_object_property_get_value - retrieve the value of a property
337 * @obj: drm mode object to get property value from
338 * @property: property to retrieve
339 * @val: storage for the property value
341 * This function retrieves the softare state of the given property for the given
342 * property. Since there is no driver callback to retrieve the current property
343 * value this might be out of sync with the hardware, depending upon the driver
346 * Atomic drivers should never call this function directly, the core will read
347 * out property values through the various ->atomic_get_property callbacks.
350 * Zero on success, error code on failure.
352 int drm_object_property_get_value(struct drm_mode_object *obj,
353 struct drm_property *property, uint64_t *val)
355 WARN_ON(drm_drv_uses_atomic_modeset(property->dev));
357 return __drm_object_property_get_value(obj, property, val);
359 EXPORT_SYMBOL(drm_object_property_get_value);
362 * drm_object_property_get_default_value - retrieve the default value of a
363 * property when in atomic mode.
364 * @obj: drm mode object to get property value from
365 * @property: property to retrieve
366 * @val: storage for the property value
368 * This function retrieves the default state of the given property as passed in
369 * to drm_object_attach_property
371 * Only atomic drivers should call this function directly, as for non-atomic
372 * drivers it will return the current value.
375 * Zero on success, error code on failure.
377 int drm_object_property_get_default_value(struct drm_mode_object *obj,
378 struct drm_property *property,
381 WARN_ON(!drm_drv_uses_atomic_modeset(property->dev));
383 return __drm_object_property_get_prop_value(obj, property, val);
385 EXPORT_SYMBOL(drm_object_property_get_default_value);
387 /* helper for getconnector and getproperties ioctls */
388 int drm_mode_object_get_properties(struct drm_mode_object *obj, bool atomic,
389 uint32_t __user *prop_ptr,
390 uint64_t __user *prop_values,
391 uint32_t *arg_count_props)
395 for (i = 0, count = 0; i < obj->properties->count; i++) {
396 struct drm_property *prop = obj->properties->properties[i];
399 if ((prop->flags & DRM_MODE_PROP_ATOMIC) && !atomic)
402 if (*arg_count_props > count) {
403 ret = __drm_object_property_get_value(obj, prop, &val);
407 if (put_user(prop->base.id, prop_ptr + count))
410 if (put_user(val, prop_values + count))
416 *arg_count_props = count;
422 * drm_mode_obj_get_properties_ioctl - get the current value of a object's property
425 * @file_priv: DRM file info
427 * This function retrieves the current value for an object's property. Compared
428 * to the connector specific ioctl this one is extended to also work on crtc and
431 * Called by the user via ioctl.
434 * Zero on success, negative errno on failure.
436 int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data,
437 struct drm_file *file_priv)
439 struct drm_mode_obj_get_properties *arg = data;
440 struct drm_mode_object *obj;
441 struct drm_modeset_acquire_ctx ctx;
444 if (!drm_core_check_feature(dev, DRIVER_MODESET))
447 DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
449 obj = drm_mode_object_find(dev, file_priv, arg->obj_id, arg->obj_type);
454 if (!obj->properties) {
459 ret = drm_mode_object_get_properties(obj, file_priv->atomic,
460 (uint32_t __user *)(unsigned long)(arg->props_ptr),
461 (uint64_t __user *)(unsigned long)(arg->prop_values_ptr),
465 drm_mode_object_put(obj);
467 DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
471 struct drm_property *drm_mode_obj_find_prop_id(struct drm_mode_object *obj,
476 for (i = 0; i < obj->properties->count; i++)
477 if (obj->properties->properties[i]->base.id == prop_id)
478 return obj->properties->properties[i];
482 EXPORT_SYMBOL_FOR_TESTS_ONLY(drm_mode_obj_find_prop_id);
484 static int set_property_legacy(struct drm_mode_object *obj,
485 struct drm_property *prop,
488 struct drm_device *dev = prop->dev;
489 struct drm_mode_object *ref;
490 struct drm_modeset_acquire_ctx ctx;
493 if (!drm_property_change_valid_get(prop, prop_value, &ref))
496 DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
498 case DRM_MODE_OBJECT_CONNECTOR:
499 ret = drm_connector_set_obj_prop(obj, prop, prop_value);
501 case DRM_MODE_OBJECT_CRTC:
502 ret = drm_mode_crtc_set_obj_prop(obj, prop, prop_value);
504 case DRM_MODE_OBJECT_PLANE:
505 ret = drm_mode_plane_set_obj_prop(obj_to_plane(obj),
509 drm_property_change_valid_put(prop, ref);
510 DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
515 static int set_property_atomic(struct drm_mode_object *obj,
516 struct drm_file *file_priv,
517 struct drm_property *prop,
520 struct drm_device *dev = prop->dev;
521 struct drm_atomic_state *state;
522 struct drm_modeset_acquire_ctx ctx;
525 state = drm_atomic_state_alloc(dev);
529 drm_modeset_acquire_init(&ctx, 0);
530 state->acquire_ctx = &ctx;
533 if (prop == state->dev->mode_config.dpms_property) {
534 if (obj->type != DRM_MODE_OBJECT_CONNECTOR) {
539 ret = drm_atomic_connector_commit_dpms(state,
540 obj_to_connector(obj),
543 ret = drm_atomic_set_property(state, file_priv, obj, prop, prop_value, false);
546 ret = drm_atomic_commit(state);
549 if (ret == -EDEADLK) {
550 drm_atomic_state_clear(state);
551 drm_modeset_backoff(&ctx);
555 drm_atomic_state_put(state);
557 drm_modeset_drop_locks(&ctx);
558 drm_modeset_acquire_fini(&ctx);
563 int drm_mode_obj_set_property_ioctl(struct drm_device *dev, void *data,
564 struct drm_file *file_priv)
566 struct drm_mode_obj_set_property *arg = data;
567 struct drm_mode_object *arg_obj;
568 struct drm_property *property;
571 if (!drm_core_check_feature(dev, DRIVER_MODESET))
574 arg_obj = drm_mode_object_find(dev, file_priv, arg->obj_id, arg->obj_type);
578 if (!arg_obj->properties)
581 property = drm_mode_obj_find_prop_id(arg_obj, arg->prop_id);
585 if (drm_drv_uses_atomic_modeset(property->dev))
586 ret = set_property_atomic(arg_obj, file_priv, property, arg->value);
588 ret = set_property_legacy(arg_obj, property, arg->value);
591 drm_mode_object_put(arg_obj);