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
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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
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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>
25 #include <drm/drm_mode_object.h>
26 #include <drm/drm_atomic.h>
28 #include "drm_crtc_internal.h"
31 * Internal function to assign a slot in the object idr and optionally
32 * register the object into the idr.
34 int __drm_mode_object_add(struct drm_device *dev, struct drm_mode_object *obj,
35 uint32_t obj_type, bool register_obj,
36 void (*obj_free_cb)(struct kref *kref))
40 mutex_lock(&dev->mode_config.idr_mutex);
41 ret = idr_alloc(&dev->mode_config.crtc_idr, register_obj ? obj : NULL, 1, 0, GFP_KERNEL);
44 * Set up the object linking under the protection of the idr
45 * lock so that other users can't see inconsistent state.
50 obj->free_cb = obj_free_cb;
51 kref_init(&obj->refcount);
54 mutex_unlock(&dev->mode_config.idr_mutex);
56 return ret < 0 ? ret : 0;
60 * drm_mode_object_add - allocate a new modeset identifier
62 * @obj: object pointer, used to generate unique ID
63 * @obj_type: object type
65 * Create a unique identifier based on @ptr in @dev's identifier space. Used
66 * for tracking modes, CRTCs and connectors.
69 * Zero on success, error code on failure.
71 int drm_mode_object_add(struct drm_device *dev,
72 struct drm_mode_object *obj, uint32_t obj_type)
74 return __drm_mode_object_add(dev, obj, obj_type, true, NULL);
77 void drm_mode_object_register(struct drm_device *dev,
78 struct drm_mode_object *obj)
80 mutex_lock(&dev->mode_config.idr_mutex);
81 idr_replace(&dev->mode_config.crtc_idr, obj, obj->id);
82 mutex_unlock(&dev->mode_config.idr_mutex);
86 * drm_mode_object_unregister - free a modeset identifer
88 * @object: object to free
90 * Free @id from @dev's unique identifier pool.
91 * This function can be called multiple times, and guards against
93 * These modeset identifiers are _not_ reference counted. Hence don't use this
94 * for reference counted modeset objects like framebuffers.
96 void drm_mode_object_unregister(struct drm_device *dev,
97 struct drm_mode_object *object)
99 mutex_lock(&dev->mode_config.idr_mutex);
101 idr_remove(&dev->mode_config.crtc_idr, object->id);
104 mutex_unlock(&dev->mode_config.idr_mutex);
107 struct drm_mode_object *__drm_mode_object_find(struct drm_device *dev,
108 uint32_t id, uint32_t type)
110 struct drm_mode_object *obj = NULL;
112 mutex_lock(&dev->mode_config.idr_mutex);
113 obj = idr_find(&dev->mode_config.crtc_idr, id);
114 if (obj && type != DRM_MODE_OBJECT_ANY && obj->type != type)
116 if (obj && obj->id != id)
119 if (obj && obj->free_cb) {
120 if (!kref_get_unless_zero(&obj->refcount))
123 mutex_unlock(&dev->mode_config.idr_mutex);
129 * drm_mode_object_find - look up a drm object with static lifetime
131 * @id: id of the mode object
132 * @type: type of the mode object
134 * This function is used to look up a modeset object. It will acquire a
135 * reference for reference counted objects. This reference must be dropped again
136 * by callind drm_mode_object_put().
138 struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
139 uint32_t id, uint32_t type)
141 struct drm_mode_object *obj = NULL;
143 obj = __drm_mode_object_find(dev, id, type);
146 EXPORT_SYMBOL(drm_mode_object_find);
149 * drm_mode_object_put - release a mode object reference
150 * @obj: DRM mode object
152 * This function decrements the object's refcount if it is a refcounted modeset
153 * object. It is a no-op on any other object. This is used to drop references
154 * acquired with drm_mode_object_get().
156 void drm_mode_object_put(struct drm_mode_object *obj)
159 DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount));
160 kref_put(&obj->refcount, obj->free_cb);
163 EXPORT_SYMBOL(drm_mode_object_put);
166 * drm_mode_object_get - acquire a mode object reference
167 * @obj: DRM mode object
169 * This function increments the object's refcount if it is a refcounted modeset
170 * object. It is a no-op on any other object. References should be dropped again
171 * by calling drm_mode_object_put().
173 void drm_mode_object_get(struct drm_mode_object *obj)
176 DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount));
177 kref_get(&obj->refcount);
180 EXPORT_SYMBOL(drm_mode_object_get);
183 * drm_object_attach_property - attach a property to a modeset object
184 * @obj: drm modeset object
185 * @property: property to attach
186 * @init_val: initial value of the property
188 * This attaches the given property to the modeset object with the given initial
189 * value. Currently this function cannot fail since the properties are stored in
190 * a statically sized array.
192 void drm_object_attach_property(struct drm_mode_object *obj,
193 struct drm_property *property,
196 int count = obj->properties->count;
198 if (count == DRM_OBJECT_MAX_PROPERTY) {
199 WARN(1, "Failed to attach object property (type: 0x%x). Please "
200 "increase DRM_OBJECT_MAX_PROPERTY by 1 for each time "
201 "you see this message on the same object type.\n",
206 obj->properties->properties[count] = property;
207 obj->properties->values[count] = init_val;
208 obj->properties->count++;
210 EXPORT_SYMBOL(drm_object_attach_property);
213 * drm_object_property_set_value - set the value of a property
214 * @obj: drm mode object to set property value for
215 * @property: property to set
216 * @val: value the property should be set to
218 * This function sets a given property on a given object. This function only
219 * changes the software state of the property, it does not call into the
220 * driver's ->set_property callback.
222 * Note that atomic drivers should not have any need to call this, the core will
223 * ensure consistency of values reported back to userspace through the
224 * appropriate ->atomic_get_property callback. Only legacy drivers should call
225 * this function to update the tracked value (after clamping and other
226 * restrictions have been applied).
229 * Zero on success, error code on failure.
231 int drm_object_property_set_value(struct drm_mode_object *obj,
232 struct drm_property *property, uint64_t val)
236 WARN_ON(drm_drv_uses_atomic_modeset(property->dev) &&
237 !(property->flags & DRM_MODE_PROP_IMMUTABLE));
239 for (i = 0; i < obj->properties->count; i++) {
240 if (obj->properties->properties[i] == property) {
241 obj->properties->values[i] = val;
248 EXPORT_SYMBOL(drm_object_property_set_value);
250 int __drm_object_property_get_value(struct drm_mode_object *obj,
251 struct drm_property *property, uint64_t *val)
255 /* read-only properties bypass atomic mechanism and still store
256 * their value in obj->properties->values[].. mostly to avoid
257 * having to deal w/ EDID and similar props in atomic paths:
259 if (drm_drv_uses_atomic_modeset(property->dev) &&
260 !(property->flags & DRM_MODE_PROP_IMMUTABLE))
261 return drm_atomic_get_property(obj, property, val);
263 for (i = 0; i < obj->properties->count; i++) {
264 if (obj->properties->properties[i] == property) {
265 *val = obj->properties->values[i];
275 * drm_object_property_get_value - retrieve the value of a property
276 * @obj: drm mode object to get property value from
277 * @property: property to retrieve
278 * @val: storage for the property value
280 * This function retrieves the softare state of the given property for the given
281 * property. Since there is no driver callback to retrieve the current property
282 * value this might be out of sync with the hardware, depending upon the driver
285 * Atomic drivers should never call this function directly, the core will read
286 * out property values through the various ->atomic_get_property callbacks.
289 * Zero on success, error code on failure.
291 int drm_object_property_get_value(struct drm_mode_object *obj,
292 struct drm_property *property, uint64_t *val)
294 WARN_ON(drm_drv_uses_atomic_modeset(property->dev));
296 return __drm_object_property_get_value(obj, property, val);
298 EXPORT_SYMBOL(drm_object_property_get_value);
300 /* helper for getconnector and getproperties ioctls */
301 int drm_mode_object_get_properties(struct drm_mode_object *obj, bool atomic,
302 uint32_t __user *prop_ptr,
303 uint64_t __user *prop_values,
304 uint32_t *arg_count_props)
308 for (i = 0, count = 0; i < obj->properties->count; i++) {
309 struct drm_property *prop = obj->properties->properties[i];
312 if ((prop->flags & DRM_MODE_PROP_ATOMIC) && !atomic)
315 if (*arg_count_props > count) {
316 ret = __drm_object_property_get_value(obj, prop, &val);
320 if (put_user(prop->base.id, prop_ptr + count))
323 if (put_user(val, prop_values + count))
329 *arg_count_props = count;
335 * drm_mode_obj_get_properties_ioctl - get the current value of a object's property
338 * @file_priv: DRM file info
340 * This function retrieves the current value for an object's property. Compared
341 * to the connector specific ioctl this one is extended to also work on crtc and
344 * Called by the user via ioctl.
347 * Zero on success, negative errno on failure.
349 int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data,
350 struct drm_file *file_priv)
352 struct drm_mode_obj_get_properties *arg = data;
353 struct drm_mode_object *obj;
356 if (!drm_core_check_feature(dev, DRIVER_MODESET))
359 drm_modeset_lock_all(dev);
361 obj = drm_mode_object_find(dev, arg->obj_id, arg->obj_type);
366 if (!obj->properties) {
371 ret = drm_mode_object_get_properties(obj, file_priv->atomic,
372 (uint32_t __user *)(unsigned long)(arg->props_ptr),
373 (uint64_t __user *)(unsigned long)(arg->prop_values_ptr),
377 drm_mode_object_put(obj);
379 drm_modeset_unlock_all(dev);
383 struct drm_property *drm_mode_obj_find_prop_id(struct drm_mode_object *obj,
388 for (i = 0; i < obj->properties->count; i++)
389 if (obj->properties->properties[i]->base.id == prop_id)
390 return obj->properties->properties[i];
395 static int set_property_legacy(struct drm_mode_object *obj,
396 struct drm_property *prop,
399 struct drm_device *dev = prop->dev;
400 struct drm_mode_object *ref;
403 if (!drm_property_change_valid_get(prop, prop_value, &ref))
406 drm_modeset_lock_all(dev);
408 case DRM_MODE_OBJECT_CONNECTOR:
409 ret = drm_mode_connector_set_obj_prop(obj, prop,
412 case DRM_MODE_OBJECT_CRTC:
413 ret = drm_mode_crtc_set_obj_prop(obj, prop, prop_value);
415 case DRM_MODE_OBJECT_PLANE:
416 ret = drm_mode_plane_set_obj_prop(obj_to_plane(obj),
420 drm_property_change_valid_put(prop, ref);
421 drm_modeset_unlock_all(dev);
426 static int set_property_atomic(struct drm_mode_object *obj,
427 struct drm_property *prop,
430 struct drm_device *dev = prop->dev;
431 struct drm_atomic_state *state;
432 struct drm_modeset_acquire_ctx ctx;
435 state = drm_atomic_state_alloc(dev);
439 drm_modeset_acquire_init(&ctx, 0);
440 state->acquire_ctx = &ctx;
442 if (prop == state->dev->mode_config.dpms_property) {
443 if (obj->type != DRM_MODE_OBJECT_CONNECTOR) {
448 ret = drm_atomic_connector_commit_dpms(state,
449 obj_to_connector(obj),
452 ret = drm_atomic_set_property(state, obj, prop, prop_value);
455 ret = drm_atomic_commit(state);
458 if (ret == -EDEADLK) {
459 drm_atomic_state_clear(state);
460 drm_modeset_backoff(&ctx);
464 drm_atomic_state_put(state);
466 drm_modeset_drop_locks(&ctx);
467 drm_modeset_acquire_fini(&ctx);
472 int drm_mode_obj_set_property_ioctl(struct drm_device *dev, void *data,
473 struct drm_file *file_priv)
475 struct drm_mode_obj_set_property *arg = data;
476 struct drm_mode_object *arg_obj;
477 struct drm_property *property;
480 if (!drm_core_check_feature(dev, DRIVER_MODESET))
483 arg_obj = drm_mode_object_find(dev, arg->obj_id, arg->obj_type);
487 if (!arg_obj->properties)
490 property = drm_mode_obj_find_prop_id(arg_obj, arg->prop_id);
494 if (drm_drv_uses_atomic_modeset(property->dev))
495 ret = set_property_atomic(arg_obj, property, arg->value);
497 ret = set_property_legacy(arg_obj, property, arg->value);
500 drm_mode_object_put(arg_obj);