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