include/drm/drm_framebuffer.h - arm/linux - Git at Google

 /*
  * 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/list.h>
 #include <linux/ctype.h>
 #include <drm/drm_mode_object.h>

 struct drm_framebuffer;
 struct drm_file;
 struct drm_device;

 /**
  * 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.
 	 *
 	 * 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);
 };

 /**
  * 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 {
 	/**
 	 * @dev: DRM device this framebuffer belongs to
 	 */
 	struct drm_device *dev;
 	/**
 	 * @head: Place on the &drm_mode_config.fb_list, access protected by
 	 * &drm_mode_config.fb_lock.
 	 */
 	struct list_head head;

 	/**
 	 * @base: base modeset object structure, contains the reference count.
 	 */
 	struct drm_mode_object base;
 	/**
 	 * @format: framebuffer format information
 	 */
 	const struct drm_format_info *format;
 	/**
 	 * @funcs: framebuffer vfunc table
 	 */
 	const struct drm_framebuffer_funcs *funcs;
 	/**
 	 * @pitches: Line stride per buffer. For userspace created object this
 	 * is copied from drm_mode_fb_cmd2.
 	 */
 	unsigned int pitches[4];
 	/**
 	 * @offsets: Offset from buffer start to the actual pixel data in bytes,
 	 * per buffer. For userspace created object this is copied from
 	 * drm_mode_fb_cmd2.
 	 *
 	 * Note that this is a linear offset and does not take into account
 	 * tiling or buffer laytou per @modifier. It meant to be used when the
 	 * actual pixel data for this framebuffer plane starts at an offset,
 	 * e.g.  when multiple planes are allocated within the same backing
 	 * storage buffer object. For tiled layouts this generally means it
 	 * @offsets must at least be tile-size aligned, but hardware often has
 	 * stricter requirements.
 	 *
 	 * This should not be used to specifiy x/y pixel offsets into the buffer
 	 * data (even for linear buffers). Specifying an x/y pixel offset is
 	 * instead done through the source rectangle in &struct drm_plane_state.
 	 */
 	unsigned int offsets[4];
 	/**
 	 * @modifier: Data layout modifier. This is used to describe
 	 * tiling, or also special layouts (like compression) of auxiliary
 	 * buffers. For userspace created object this is copied from
 	 * drm_mode_fb_cmd2.
 	 */
 	uint64_t modifier;
 	/**
 	 * @width: Logical width of the visible area of the framebuffer, in
 	 * pixels.
 	 */
 	unsigned int width;
 	/**
 	 * @height: Logical height of the visible area of the framebuffer, in
 	 * pixels.
 	 */
 	unsigned int height;
 	/**
 	 * @flags: Framebuffer flags like DRM_MODE_FB_INTERLACED or
 	 * DRM_MODE_FB_MODIFIERS.
 	 */
 	int flags;
 	/**
 	 * @hot_x: X coordinate of the cursor hotspot. Used by the legacy cursor
 	 * IOCTL when the driver supports cursor through a DRM_PLANE_TYPE_CURSOR
 	 * universal plane.
 	 */
 	int hot_x;
 	/**
 	 * @hot_y: Y coordinate of the cursor hotspot. Used by the legacy cursor
 	 * IOCTL when the driver supports cursor through a DRM_PLANE_TYPE_CURSOR
 	 * universal plane.
 	 */
 	int hot_y;
 	/**
 	 * @filp_head: Placed on &drm_file.fbs, protected by &drm_file.fbs_lock.
 	 */
 	struct list_head filp_head;
 	/**
 	 * @obj: GEM objects backing the framebuffer, one per plane (optional).
 	 *
 	 * This is used by the GEM framebuffer helpers, see e.g.
 	 * drm_gem_fb_create().
 	 */
 	struct drm_gem_object *obj[4];
 };

 #define obj_to_fb(x) container_of(x, struct drm_framebuffer, base)

 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,
 					       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_mode_object_get(&fb->base);
 }

 /**
  * 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_mode_object_put(&fb->base);
 }

 /**
  * drm_framebuffer_reference - acquire a framebuffer reference
  * @fb: DRM framebuffer
  *
  * This is a compatibility alias for drm_framebuffer_get() and should not be
  * used by new code.
  */
 static inline void drm_framebuffer_reference(struct drm_framebuffer *fb)
 {
 	drm_framebuffer_get(fb);
 }

 /**
  * drm_framebuffer_unreference - release a framebuffer reference
  * @fb: DRM framebuffer
  *
  * This is a compatibility alias for drm_framebuffer_put() and should not be
  * used by new code.
  */
 static inline void drm_framebuffer_unreference(struct drm_framebuffer *fb)
 {
 	drm_framebuffer_put(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(struct drm_framebuffer *fb)
 {
 	return kref_read(&fb->base.refcount);
 }

 /**
  * 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)
 {
 	if (fb)
 		drm_framebuffer_get(fb);
 	if (*p)
 		drm_framebuffer_put(*p);
 	*p = 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) \
 	for (WARN_ON(!mutex_is_locked(&(dev)->mode_config.fb_lock)),		\
 	     fb = list_first_entry(&(dev)->mode_config.fb_list,	\
 					  struct drm_framebuffer, head);	\
 	     &fb->head != (&(dev)->mode_config.fb_list);			\
 	     fb = list_next_entry(fb, head))

 int drm_framebuffer_plane_width(int width,
 				const struct drm_framebuffer *fb, int plane);
 int drm_framebuffer_plane_height(int height,
 				 const struct drm_framebuffer *fb, int plane);

 #endif
	/*
	* 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/list.h>
	#include <linux/ctype.h>
	#include <drm/drm_mode_object.h>

	struct drm_framebuffer;
	struct drm_file;
	struct drm_device;

	/**
	* 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.
	*
	* 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);
	};

	/**
	* 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 {
	/**
	* @dev: DRM device this framebuffer belongs to
	*/
	struct drm_device *dev;
	/**
	* @head: Place on the &drm_mode_config.fb_list, access protected by
	* &drm_mode_config.fb_lock.
	*/
	struct list_head head;

	/**
	* @base: base modeset object structure, contains the reference count.
	*/
	struct drm_mode_object base;
	/**
	* @format: framebuffer format information
	*/
	const struct drm_format_info *format;
	/**
	* @funcs: framebuffer vfunc table
	*/
	const struct drm_framebuffer_funcs *funcs;
	/**
	* @pitches: Line stride per buffer. For userspace created object this
	* is copied from drm_mode_fb_cmd2.
	*/
	unsigned int pitches[4];
	/**
	* @offsets: Offset from buffer start to the actual pixel data in bytes,
	* per buffer. For userspace created object this is copied from
	* drm_mode_fb_cmd2.
	*
	* Note that this is a linear offset and does not take into account
	* tiling or buffer laytou per @modifier. It meant to be used when the
	* actual pixel data for this framebuffer plane starts at an offset,
	* e.g. when multiple planes are allocated within the same backing
	* storage buffer object. For tiled layouts this generally means it
	* @offsets must at least be tile-size aligned, but hardware often has
	* stricter requirements.
	*
	* This should not be used to specifiy x/y pixel offsets into the buffer
	* data (even for linear buffers). Specifying an x/y pixel offset is
	* instead done through the source rectangle in &struct drm_plane_state.
	*/
	unsigned int offsets[4];
	/**
	* @modifier: Data layout modifier. This is used to describe
	* tiling, or also special layouts (like compression) of auxiliary
	* buffers. For userspace created object this is copied from
	* drm_mode_fb_cmd2.
	*/
	uint64_t modifier;
	/**
	* @width: Logical width of the visible area of the framebuffer, in
	* pixels.
	*/
	unsigned int width;
	/**
	* @height: Logical height of the visible area of the framebuffer, in
	* pixels.
	*/
	unsigned int height;
	/**
	* @flags: Framebuffer flags like DRM_MODE_FB_INTERLACED or
	* DRM_MODE_FB_MODIFIERS.
	*/
	int flags;
	/**
	* @hot_x: X coordinate of the cursor hotspot. Used by the legacy cursor
	* IOCTL when the driver supports cursor through a DRM_PLANE_TYPE_CURSOR
	* universal plane.
	*/
	int hot_x;
	/**
	* @hot_y: Y coordinate of the cursor hotspot. Used by the legacy cursor
	* IOCTL when the driver supports cursor through a DRM_PLANE_TYPE_CURSOR
	* universal plane.
	*/
	int hot_y;
	/**
	* @filp_head: Placed on &drm_file.fbs, protected by &drm_file.fbs_lock.
	*/
	struct list_head filp_head;
	/**
	* @obj: GEM objects backing the framebuffer, one per plane (optional).
	*
	* This is used by the GEM framebuffer helpers, see e.g.
	* drm_gem_fb_create().
	*/
	struct drm_gem_object *obj[4];
	};

	#define obj_to_fb(x) container_of(x, struct drm_framebuffer, base)

	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,
	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_mode_object_get(&fb->base);
	}

	/**
	* 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_mode_object_put(&fb->base);
	}

	/**
	* drm_framebuffer_reference - acquire a framebuffer reference
	* @fb: DRM framebuffer
	*
	* This is a compatibility alias for drm_framebuffer_get() and should not be
	* used by new code.
	*/
	static inline void drm_framebuffer_reference(struct drm_framebuffer *fb)
	{
	drm_framebuffer_get(fb);
	}

	/**
	* drm_framebuffer_unreference - release a framebuffer reference
	* @fb: DRM framebuffer
	*
	* This is a compatibility alias for drm_framebuffer_put() and should not be
	* used by new code.
	*/
	static inline void drm_framebuffer_unreference(struct drm_framebuffer *fb)
	{
	drm_framebuffer_put(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(struct drm_framebuffer *fb)
	{
	return kref_read(&fb->base.refcount);
	}

	/**
	* 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)
	{
	if (fb)
	drm_framebuffer_get(fb);
	if (*p)
	drm_framebuffer_put(*p);
	*p = 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) \
	for (WARN_ON(!mutex_is_locked(&(dev)->mode_config.fb_lock)), \
	fb = list_first_entry(&(dev)->mode_config.fb_list, \
	struct drm_framebuffer, head); \
	&fb->head != (&(dev)->mode_config.fb_list); \
	fb = list_next_entry(fb, head))

	int drm_framebuffer_plane_width(int width,
	const struct drm_framebuffer *fb, int plane);
	int drm_framebuffer_plane_height(int height,
	const struct drm_framebuffer *fb, int plane);

	#endif