0
     €БА„ляїДГ ('    /*
 * 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/bits.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 {
	/**
	 * @destroy:
	 *
	 * Clean up framebuffer resources, specifically also unreference the
	 * backing storage. The core guarantees to call this function for every
	 * framebuffer successfully created by calling
	 * &drm_mode_config_funcs.fb_create. Drivers must also call
	 * drm_framebuffer_cleanup() to release DRM core resources for this
	 * framebuffer.
	 */
	void (*destroy)(struct drm_framebuffer *framebuffer);

	/**
	 * @create_handle:
	 *
	 * Create a buffer handle in the driver-specific buffer manager (either
	 * GEM or TTM) valid for the passed-in &struct drm_file. This is used by
	 * the core to implement the GETFB IOCTL, which returns (for
	 * sufficiently priviledged user) also a native buffer handle. This can
	 * be used for seamless transitions between modesetting clients by
	 * copying the current screen contents to a private buffer and blending
	 * between that and the new contents.
	 *
	 * GEM based drivers should call drm_gem_handle_create() to create the
	 * handle.
	 *
	 * RETURNS:
	 *
	 * 0 on success or a negative error code on failure.
	 */
	int (*create_handle)(struct drm_framebuffer *fb,
			     struct drm_file *file_priv,
			     unsigned int *handle);
	/**
	 * @dirty:
	 *
	 * Optional callback for the dirty fb IOCTL.
	 *
	 * Userspace can notify the driver via this callback that an area of the
	 * framebuffer has changed and should be flushed to the display
	 * hardware. This can also be used internally, e.g. by the fbdev
	 * emulation, though that's not the case currently.
	 *
	 * See documentation in drm_mode.h for the struct drm_mode_fb_dirty_cmd
	 * for more information as all the semantics and arguments have a one to
	 * one mapping on this function.
	 *
	 * Atomic drivers should use drm_atomic_helper_dirtyfb() to implement
	 * this hook.
	 *
	 * RETURNS:
	 *
	 * 0 on success or a negative error code on failure.
	 */
	int (*dirty)(struct drm_framebuffer *framebuffer,
		     struct drm_file *file_priv, unsigned flags,
		     unsigned color, struct drm_clip_rect *clips,
		     unsigned num_clips);
};

#define DRM_FRAMEBUFFER_HAS_HANDLE_REF(_i)	BIT(0u + (_i))

/**
 * 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 backin