drm_framebuffer.h | Explore in Territory

/*
 * 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.
 */

#ifndef __DRM_FRAMEBUFFER_H__
#define __DRM_FRAMEBUFFER_H__

#include <linux/ctype.h>
#include <linux/list.h>
#include <linux/sched.h>

#include <drm/drm_fourcc.h>
#include <drm/drm_mode_object.h>

struct drm_clip_rect;
struct drm_device;
struct drm_file;
struct drm_framebuffer;
struct drm_gem_object;

/**
 * struct drm_framebuffer_funcs - framebuffer hooks
 */
struct drm_framebuffer_funcs { … };

/**
 * struct drm_framebuffer - frame buffer object
 *
 * Note that the fb is refcounted for the benefit of driver internals,
 * for example some hw, disabling a CRTC/plane is asynchronous, and
 * scanout does not actually complete until the next vblank.  So some
 * cleanup (like releasing the reference(s) on the backing GEM bo(s))
 * should be deferred.  In cases like this, the driver would like to
 * hold a ref to the fb even though it has already been removed from
 * userspace perspective. See drm_framebuffer_get() and
 * drm_framebuffer_put().
 *
 * The refcount is stored inside the mode object @base.
 */
struct drm_framebuffer { … };

#define obj_to_fb(x) …

int drm_framebuffer_init(struct drm_device *dev,
			 struct drm_framebuffer *fb,
			 const struct drm_framebuffer_funcs *funcs);
struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev,
					       struct drm_file *file_priv,
					       uint32_t id);
void drm_framebuffer_remove(struct drm_framebuffer *fb);
void drm_framebuffer_cleanup(struct drm_framebuffer *fb);
void drm_framebuffer_unregister_private(struct drm_framebuffer *fb);

/**
 * drm_framebuffer_get - acquire a framebuffer reference
 * @fb: DRM framebuffer
 *
 * This function increments the framebuffer's reference count.
 */
static inline void drm_framebuffer_get(struct drm_framebuffer *fb)
{ … }

/**
 * drm_framebuffer_put - release a framebuffer reference
 * @fb: DRM framebuffer
 *
 * This function decrements the framebuffer's reference count and frees the
 * framebuffer if the reference count drops to zero.
 */
static inline void drm_framebuffer_put(struct drm_framebuffer *fb)
{ … }

/**
 * drm_framebuffer_read_refcount - read the framebuffer reference count.
 * @fb: framebuffer
 *
 * This functions returns the framebuffer's reference count.
 */
static inline uint32_t drm_framebuffer_read_refcount(const struct drm_framebuffer *fb)
{ … }

/**
 * drm_framebuffer_assign - store a reference to the fb
 * @p: location to store framebuffer
 * @fb: new framebuffer (maybe NULL)
 *
 * This functions sets the location to store a reference to the framebuffer,
 * unreferencing the framebuffer that was previously stored in that location.
 */
static inline void drm_framebuffer_assign(struct drm_framebuffer **p,
					  struct drm_framebuffer *fb)
{ … }

/*
 * drm_for_each_fb - iterate over all framebuffers
 * @fb: the loop cursor
 * @dev: the DRM device
 *
 * Iterate over all framebuffers of @dev. User must hold
 * &drm_mode_config.fb_lock.
 */
#define drm_for_each_fb(fb, dev) …

/**
 * struct drm_afbc_framebuffer - a special afbc frame buffer object
 *
 * A derived class of struct drm_framebuffer, dedicated for afbc use cases.
 */
struct drm_afbc_framebuffer { … };

#define fb_to_afbc_fb(x) …

#endif
linux/include/drm/drm_framebuffer.h
