| /* |
| * Copyright (c) 2016 Intel Corporation |
| * |
| * Permission to use, copy, modify, distribute, and sell this software and its |
| * documentation for any purpose is hereby granted without fee, provided that |
| * the above copyright notice appear in all copies and that both that copyright |
| * notice and this permission notice appear in supporting documentation, and |
| * that the name of the copyright holders not be used in advertising or |
| * publicity pertaining to distribution of the software without specific, |
| * written prior permission. The copyright holders make no representations |
| * about the suitability of this software for any purpose. It is provided "as |
| * is" without express or implied warranty. |
| * |
| * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
| * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
| * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
| * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, |
| * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
| * OF THIS SOFTWARE. |
| */ |
| |
| #include <linux/export.h> |
| #include <drm/drmP.h> |
| #include <drm/drm_mode_object.h> |
| #include <drm/drm_atomic.h> |
| |
| #include "drm_crtc_internal.h" |
| |
| /* |
| * Internal function to assign a slot in the object idr and optionally |
| * register the object into the idr. |
| */ |
| int __drm_mode_object_add(struct drm_device *dev, struct drm_mode_object *obj, |
| uint32_t obj_type, bool register_obj, |
| void (*obj_free_cb)(struct kref *kref)) |
| { |
| int ret; |
| |
| mutex_lock(&dev->mode_config.idr_mutex); |
| ret = idr_alloc(&dev->mode_config.crtc_idr, register_obj ? obj : NULL, |
| 1, 0, GFP_KERNEL); |
| if (ret >= 0) { |
| /* |
| * Set up the object linking under the protection of the idr |
| * lock so that other users can't see inconsistent state. |
| */ |
| obj->id = ret; |
| obj->type = obj_type; |
| if (obj_free_cb) { |
| obj->free_cb = obj_free_cb; |
| kref_init(&obj->refcount); |
| } |
| } |
| mutex_unlock(&dev->mode_config.idr_mutex); |
| |
| return ret < 0 ? ret : 0; |
| } |
| |
| /** |
| * drm_mode_object_add - allocate a new modeset identifier |
| * @dev: DRM device |
| * @obj: object pointer, used to generate unique ID |
| * @obj_type: object type |
| * |
| * Create a unique identifier based on @ptr in @dev's identifier space. Used |
| * for tracking modes, CRTCs and connectors. |
| * |
| * Returns: |
| * Zero on success, error code on failure. |
| */ |
| int drm_mode_object_add(struct drm_device *dev, |
| struct drm_mode_object *obj, uint32_t obj_type) |
| { |
| return __drm_mode_object_add(dev, obj, obj_type, true, NULL); |
| } |
| |
| void drm_mode_object_register(struct drm_device *dev, |
| struct drm_mode_object *obj) |
| { |
| mutex_lock(&dev->mode_config.idr_mutex); |
| idr_replace(&dev->mode_config.crtc_idr, obj, obj->id); |
| mutex_unlock(&dev->mode_config.idr_mutex); |
| } |
| |
| /** |
| * drm_mode_object_unregister - free a modeset identifer |
| * @dev: DRM device |
| * @object: object to free |
| * |
| * Free @id from @dev's unique identifier pool. |
| * This function can be called multiple times, and guards against |
| * multiple removals. |
| * These modeset identifiers are _not_ reference counted. Hence don't use this |
| * for reference counted modeset objects like framebuffers. |
| */ |
| void drm_mode_object_unregister(struct drm_device *dev, |
| struct drm_mode_object *object) |
| { |
| mutex_lock(&dev->mode_config.idr_mutex); |
| if (object->id) { |
| idr_remove(&dev->mode_config.crtc_idr, object->id); |
| object->id = 0; |
| } |
| mutex_unlock(&dev->mode_config.idr_mutex); |
| } |
| |
| /** |
| * drm_lease_required - check types which must be leased to be used |
| * @type: type of object |
| * |
| * Returns whether the provided type of drm_mode_object must |
| * be owned or leased to be used by a process. |
| */ |
| bool drm_mode_object_lease_required(uint32_t type) |
| { |
| switch(type) { |
| case DRM_MODE_OBJECT_CRTC: |
| case DRM_MODE_OBJECT_CONNECTOR: |
| case DRM_MODE_OBJECT_PLANE: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| struct drm_mode_object *__drm_mode_object_find(struct drm_device *dev, |
| struct drm_file *file_priv, |
| uint32_t id, uint32_t type) |
| { |
| struct drm_mode_object *obj = NULL; |
| |
| mutex_lock(&dev->mode_config.idr_mutex); |
| obj = idr_find(&dev->mode_config.crtc_idr, id); |
| if (obj && type != DRM_MODE_OBJECT_ANY && obj->type != type) |
| obj = NULL; |
| if (obj && obj->id != id) |
| obj = NULL; |
| |
| if (obj && drm_mode_object_lease_required(obj->type) && |
| !_drm_lease_held(file_priv, obj->id)) |
| obj = NULL; |
| |
| if (obj && obj->free_cb) { |
| if (!kref_get_unless_zero(&obj->refcount)) |
| obj = NULL; |
| } |
| mutex_unlock(&dev->mode_config.idr_mutex); |
| |
| return obj; |
| } |
| |
| /** |
| * drm_mode_object_find - look up a drm object with static lifetime |
| * @dev: drm device |
| * @file_priv: drm file |
| * @id: id of the mode object |
| * @type: type of the mode object |
| * |
| * This function is used to look up a modeset object. It will acquire a |
| * reference for reference counted objects. This reference must be dropped again |
| * by callind drm_mode_object_put(). |
| */ |
| struct drm_mode_object *drm_mode_object_find(struct drm_device *dev, |
| struct drm_file *file_priv, |
| uint32_t id, uint32_t type) |
| { |
| struct drm_mode_object *obj = NULL; |
| |
| obj = __drm_mode_object_find(dev, file_priv, id, type); |
| return obj; |
| } |
| EXPORT_SYMBOL(drm_mode_object_find); |
| |
| /** |
| * drm_mode_object_put - release a mode object reference |
| * @obj: DRM mode object |
| * |
| * This function decrements the object's refcount if it is a refcounted modeset |
| * object. It is a no-op on any other object. This is used to drop references |
| * acquired with drm_mode_object_get(). |
| */ |
| void drm_mode_object_put(struct drm_mode_object *obj) |
| { |
| if (obj->free_cb) { |
| DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount)); |
| kref_put(&obj->refcount, obj->free_cb); |
| } |
| } |
| EXPORT_SYMBOL(drm_mode_object_put); |
| |
| /** |
| * drm_mode_object_get - acquire a mode object reference |
| * @obj: DRM mode object |
| * |
| * This function increments the object's refcount if it is a refcounted modeset |
| * object. It is a no-op on any other object. References should be dropped again |
| * by calling drm_mode_object_put(). |
| */ |
| void drm_mode_object_get(struct drm_mode_object *obj) |
| { |
| if (obj->free_cb) { |
| DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount)); |
| kref_get(&obj->refcount); |
| } |
| } |
| EXPORT_SYMBOL(drm_mode_object_get); |
| |
| /** |
| * drm_object_attach_property - attach a property to a modeset object |
| * @obj: drm modeset object |
| * @property: property to attach |
| * @init_val: initial value of the property |
| * |
| * This attaches the given property to the modeset object with the given initial |
| * value. Currently this function cannot fail since the properties are stored in |
| * a statically sized array. |
| */ |
| void drm_object_attach_property(struct drm_mode_object *obj, |
| struct drm_property *property, |
| uint64_t init_val) |
| { |
| int count = obj->properties->count; |
| |
| if (count == DRM_OBJECT_MAX_PROPERTY) { |
| WARN(1, "Failed to attach object property (type: 0x%x). Please " |
| "increase DRM_OBJECT_MAX_PROPERTY by 1 for each time " |
| "you see this message on the same object type.\n", |
| obj->type); |
| return; |
| } |
| |
| obj->properties->properties[count] = property; |
| obj->properties->values[count] = init_val; |
| obj->properties->count++; |
| } |
| EXPORT_SYMBOL(drm_object_attach_property); |
| |
| /** |
| * drm_object_property_set_value - set the value of a property |
| * @obj: drm mode object to set property value for |
| * @property: property to set |
| * @val: value the property should be set to |
| * |
| * This function sets a given property on a given object. This function only |
| * changes the software state of the property, it does not call into the |
| * driver's ->set_property callback. |
| * |
| * Note that atomic drivers should not have any need to call this, the core will |
| * ensure consistency of values reported back to userspace through the |
| * appropriate ->atomic_get_property callback. Only legacy drivers should call |
| * this function to update the tracked value (after clamping and other |
| * restrictions have been applied). |
| * |
| * Returns: |
| * Zero on success, error code on failure. |
| */ |
| int drm_object_property_set_value(struct drm_mode_object *obj, |
| struct drm_property *property, uint64_t val) |
| { |
| int i; |
| |
| WARN_ON(drm_drv_uses_atomic_modeset(property->dev) && |
| !(property->flags & DRM_MODE_PROP_IMMUTABLE)); |
| |
| for (i = 0; i < obj->properties->count; i++) { |
| if (obj->properties->properties[i] == property) { |
| obj->properties->values[i] = val; |
| return 0; |
| } |
| } |
| |
| return -EINVAL; |
| } |
| EXPORT_SYMBOL(drm_object_property_set_value); |
| |
| static int __drm_object_property_get_value(struct drm_mode_object *obj, |
| struct drm_property *property, |
| uint64_t *val) |
| { |
| int i; |
| |
| /* read-only properties bypass atomic mechanism and still store |
| * their value in obj->properties->values[].. mostly to avoid |
| * having to deal w/ EDID and similar props in atomic paths: |
| */ |
| if (drm_drv_uses_atomic_modeset(property->dev) && |
| !(property->flags & DRM_MODE_PROP_IMMUTABLE)) |
| return drm_atomic_get_property(obj, property, val); |
| |
| for (i = 0; i < obj->properties->count; i++) { |
| if (obj->properties->properties[i] == property) { |
| *val = obj->properties->values[i]; |
| return 0; |
| } |
| |
| } |
| |
| return -EINVAL; |
| } |
| |
| /** |
| * drm_object_property_get_value - retrieve the value of a property |
| * @obj: drm mode object to get property value from |
| * @property: property to retrieve |
| * @val: storage for the property value |
| * |
| * This function retrieves the softare state of the given property for the given |
| * property. Since there is no driver callback to retrieve the current property |
| * value this might be out of sync with the hardware, depending upon the driver |
| * and property. |
| * |
| * Atomic drivers should never call this function directly, the core will read |
| * out property values through the various ->atomic_get_property callbacks. |
| * |
| * Returns: |
| * Zero on success, error code on failure. |
| */ |
| int drm_object_property_get_value(struct drm_mode_object *obj, |
| struct drm_property *property, uint64_t *val) |
| { |
| WARN_ON(drm_drv_uses_atomic_modeset(property->dev)); |
| |
| return __drm_object_property_get_value(obj, property, val); |
| } |
| EXPORT_SYMBOL(drm_object_property_get_value); |
| |
| /* helper for getconnector and getproperties ioctls */ |
| int drm_mode_object_get_properties(struct drm_mode_object *obj, bool atomic, |
| uint32_t __user *prop_ptr, |
| uint64_t __user *prop_values, |
| uint32_t *arg_count_props) |
| { |
| int i, ret, count; |
| |
| for (i = 0, count = 0; i < obj->properties->count; i++) { |
| struct drm_property *prop = obj->properties->properties[i]; |
| uint64_t val; |
| |
| if ((prop->flags & DRM_MODE_PROP_ATOMIC) && !atomic) |
| continue; |
| |
| if (*arg_count_props > count) { |
| ret = __drm_object_property_get_value(obj, prop, &val); |
| if (ret) |
| return ret; |
| |
| if (put_user(prop->base.id, prop_ptr + count)) |
| return -EFAULT; |
| |
| if (put_user(val, prop_values + count)) |
| return -EFAULT; |
| } |
| |
| count++; |
| } |
| *arg_count_props = count; |
| |
| return 0; |
| } |
| |
| /** |
| * drm_mode_obj_get_properties_ioctl - get the current value of a object's property |
| * @dev: DRM device |
| * @data: ioctl data |
| * @file_priv: DRM file info |
| * |
| * This function retrieves the current value for an object's property. Compared |
| * to the connector specific ioctl this one is extended to also work on crtc and |
| * plane objects. |
| * |
| * Called by the user via ioctl. |
| * |
| * Returns: |
| * Zero on success, negative errno on failure. |
| */ |
| int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data, |
| struct drm_file *file_priv) |
| { |
| struct drm_mode_obj_get_properties *arg = data; |
| struct drm_mode_object *obj; |
| int ret = 0; |
| |
| if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
| return -EOPNOTSUPP; |
| |
| drm_modeset_lock_all(dev); |
| |
| obj = drm_mode_object_find(dev, file_priv, arg->obj_id, arg->obj_type); |
| if (!obj) { |
| ret = -ENOENT; |
| goto out; |
| } |
| if (!obj->properties) { |
| ret = -EINVAL; |
| goto out_unref; |
| } |
| |
| ret = drm_mode_object_get_properties(obj, file_priv->atomic, |
| (uint32_t __user *)(unsigned long)(arg->props_ptr), |
| (uint64_t __user *)(unsigned long)(arg->prop_values_ptr), |
| &arg->count_props); |
| |
| out_unref: |
| drm_mode_object_put(obj); |
| out: |
| drm_modeset_unlock_all(dev); |
| return ret; |
| } |
| |
| struct drm_property *drm_mode_obj_find_prop_id(struct drm_mode_object *obj, |
| uint32_t prop_id) |
| { |
| int i; |
| |
| for (i = 0; i < obj->properties->count; i++) |
| if (obj->properties->properties[i]->base.id == prop_id) |
| return obj->properties->properties[i]; |
| |
| return NULL; |
| } |
| |
| static int set_property_legacy(struct drm_mode_object *obj, |
| struct drm_property *prop, |
| uint64_t prop_value) |
| { |
| struct drm_device *dev = prop->dev; |
| struct drm_mode_object *ref; |
| int ret = -EINVAL; |
| |
| if (!drm_property_change_valid_get(prop, prop_value, &ref)) |
| return -EINVAL; |
| |
| drm_modeset_lock_all(dev); |
| switch (obj->type) { |
| case DRM_MODE_OBJECT_CONNECTOR: |
| ret = drm_connector_set_obj_prop(obj, prop, prop_value); |
| break; |
| case DRM_MODE_OBJECT_CRTC: |
| ret = drm_mode_crtc_set_obj_prop(obj, prop, prop_value); |
| break; |
| case DRM_MODE_OBJECT_PLANE: |
| ret = drm_mode_plane_set_obj_prop(obj_to_plane(obj), |
| prop, prop_value); |
| break; |
| } |
| drm_property_change_valid_put(prop, ref); |
| drm_modeset_unlock_all(dev); |
| |
| return ret; |
| } |
| |
| static int set_property_atomic(struct drm_mode_object *obj, |
| struct drm_property *prop, |
| uint64_t prop_value) |
| { |
| struct drm_device *dev = prop->dev; |
| struct drm_atomic_state *state; |
| struct drm_modeset_acquire_ctx ctx; |
| int ret; |
| |
| state = drm_atomic_state_alloc(dev); |
| if (!state) |
| return -ENOMEM; |
| |
| drm_modeset_acquire_init(&ctx, 0); |
| state->acquire_ctx = &ctx; |
| retry: |
| if (prop == state->dev->mode_config.dpms_property) { |
| if (obj->type != DRM_MODE_OBJECT_CONNECTOR) { |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| ret = drm_atomic_connector_commit_dpms(state, |
| obj_to_connector(obj), |
| prop_value); |
| } else { |
| ret = drm_atomic_set_property(state, obj, prop, prop_value); |
| if (ret) |
| goto out; |
| ret = drm_atomic_commit(state); |
| } |
| out: |
| if (ret == -EDEADLK) { |
| drm_atomic_state_clear(state); |
| drm_modeset_backoff(&ctx); |
| goto retry; |
| } |
| |
| drm_atomic_state_put(state); |
| |
| drm_modeset_drop_locks(&ctx); |
| drm_modeset_acquire_fini(&ctx); |
| |
| return ret; |
| } |
| |
| int drm_mode_obj_set_property_ioctl(struct drm_device *dev, void *data, |
| struct drm_file *file_priv) |
| { |
| struct drm_mode_obj_set_property *arg = data; |
| struct drm_mode_object *arg_obj; |
| struct drm_property *property; |
| int ret = -EINVAL; |
| |
| if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
| return -EOPNOTSUPP; |
| |
| arg_obj = drm_mode_object_find(dev, file_priv, arg->obj_id, arg->obj_type); |
| if (!arg_obj) |
| return -ENOENT; |
| |
| if (!arg_obj->properties) |
| goto out_unref; |
| |
| property = drm_mode_obj_find_prop_id(arg_obj, arg->prop_id); |
| if (!property) |
| goto out_unref; |
| |
| if (drm_drv_uses_atomic_modeset(property->dev)) |
| ret = set_property_atomic(arg_obj, property, arg->value); |
| else |
| ret = set_property_legacy(arg_obj, property, arg->value); |
| |
| out_unref: |
| drm_mode_object_put(arg_obj); |
| return ret; |
| } |