diff options
Diffstat (limited to 'drivers/gpu/drm/drm_mode_object.c')
| -rw-r--r-- | drivers/gpu/drm/drm_mode_object.c | 589 |
1 files changed, 589 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_mode_object.c b/drivers/gpu/drm/drm_mode_object.c new file mode 100644 index 000000000..ba1608eff --- /dev/null +++ b/drivers/gpu/drm/drm_mode_object.c @@ -0,0 +1,589 @@ +/* + * 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 <linux/uaccess.h> + +#include <drm/drm_atomic.h> +#include <drm/drm_drv.h> +#include <drm/drm_device.h> +#include <drm/drm_file.h> +#include <drm/drm_mode_object.h> +#include <drm/drm_print.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; + + WARN_ON(!dev->driver->load && dev->registered && !obj_free_cb); + + mutex_lock(&dev->mode_config.idr_mutex); + ret = idr_alloc(&dev->mode_config.object_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.object_idr, obj, obj->id); + mutex_unlock(&dev->mode_config.idr_mutex); +} + +/** + * drm_mode_object_unregister - free a modeset identifier + * @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) +{ + WARN_ON(!dev->driver->load && dev->registered && !object->free_cb); + + mutex_lock(&dev->mode_config.idr_mutex); + if (object->id) { + idr_remove(&dev->mode_config.object_idr, object->id); + object->id = 0; + } + mutex_unlock(&dev->mode_config.idr_mutex); +} + +/** + * drm_mode_object_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.object_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. + * + * Note that all properties must be attached before the object itself is + * registered and accessible from userspace. + */ +void drm_object_attach_property(struct drm_mode_object *obj, + struct drm_property *property, + uint64_t init_val) +{ + int count = obj->properties->count; + struct drm_device *dev = property->dev; + + + if (obj->type == DRM_MODE_OBJECT_CONNECTOR) { + struct drm_connector *connector = obj_to_connector(obj); + + WARN_ON(!dev->driver->load && + connector->registration_state == DRM_CONNECTOR_REGISTERED); + } else { + WARN_ON(!dev->driver->load && dev->registered); + } + + 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_prop_value(struct drm_mode_object *obj, + struct drm_property *property, + uint64_t *val) +{ + int i; + + for (i = 0; i < obj->properties->count; i++) { + if (obj->properties->properties[i] == property) { + *val = obj->properties->values[i]; + return 0; + } + } + + return -EINVAL; +} + +static int __drm_object_property_get_value(struct drm_mode_object *obj, + struct drm_property *property, + uint64_t *val) +{ + + /* 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); + + return __drm_object_property_get_prop_value(obj, property, val); +} + +/** + * 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); + +/** + * drm_object_property_get_default_value - retrieve the default value of a + * property when in atomic mode. + * @obj: drm mode object to get property value from + * @property: property to retrieve + * @val: storage for the property value + * + * This function retrieves the default state of the given property as passed in + * to drm_object_attach_property + * + * Only atomic drivers should call this function directly, as for non-atomic + * drivers it will return the current value. + * + * Returns: + * Zero on success, error code on failure. + */ +int drm_object_property_get_default_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_prop_value(obj, property, val); +} +EXPORT_SYMBOL(drm_object_property_get_default_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; + struct drm_modeset_acquire_ctx ctx; + int ret = 0; + + if (!drm_core_check_feature(dev, DRIVER_MODESET)) + return -EOPNOTSUPP; + + DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret); + + 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_LOCK_ALL_END(dev, ctx, ret); + 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; + struct drm_modeset_acquire_ctx ctx; + int ret = -EINVAL; + + if (!drm_property_change_valid_get(prop, prop_value, &ref)) + return -EINVAL; + + DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret); + 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_LOCK_ALL_END(dev, ctx, ret); + + return ret; +} + +static int set_property_atomic(struct drm_mode_object *obj, + struct drm_file *file_priv, + 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, file_priv, 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, file_priv, property, arg->value); + else + ret = set_property_legacy(arg_obj, property, arg->value); + +out_unref: + drm_mode_object_put(arg_obj); + return ret; +} |