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: drm_framebuffer.h

/*
 * 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 {
	/**
	 * @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);
};

/**
 * 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;

/**
	 * @comm: Name of the process allocating the fb, used for fb dumping.
	 */
	char comm[TASK_COMM_LEN];

/**
	 * @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[DRM_FORMAT_MAX_PLANES];
	/**
	 * @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[DRM_FORMAT_MAX_PLANES];
	/**
	 * @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[DRM_FORMAT_MAX_PLANES];
};

#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,
					       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_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_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)
{
	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);

/**
 * 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 {
	/**
	 * @base: base framebuffer structure.
	 */
	struct drm_framebuffer base;
	/**
	 * @block_width: width of a single afbc block
	 */
	u32 block_width;
	/**
	 * @block_height: height of a single afbc block
	 */
	u32 block_height;
	/**
	 * @aligned_width: aligned frame buffer width
	 */
	u32 aligned_width;
	/**
	 * @aligned_height: aligned frame buffer height
	 */
	u32 aligned_height;
	/**
	 * @offset: offset of the first afbc header
	 */
	u32 offset;
	/**
	 * @afbc_size: minimum size of afbc buffer
	 */
	u32 afbc_size;
};

#define fb_to_afbc_fb(x) container_of(x, struct drm_afbc_framebuffer, base)

#endif

NAME	TYPE	LAST MODIFIED	SIZE	OWNER / GROUP	PERMISSIONS	ACTION
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amd_asic_type.h	f!le	2021-10-31 20:53	2.15 KB	root / root	-rw-r--r--
drm_aperture.h	f!le	2021-10-31 20:53	1.13 KB	root / root	-rw-r--r--
drm_atomic.h	f!le	2021-10-31 20:53	40.7 KB	root / root	-rw-r--r--
drm_atomic_helper.h	f!le	2021-10-31 20:53	9.27 KB	root / root	-rw-r--r--
drm_atomic_state_helper.h	f!le	2021-10-31 20:53	4.21 KB	root / root	-rw-r--r--
drm_atomic_uapi.h	f!le	2021-10-31 20:53	2.17 KB	root / root	-rw-r--r--
drm_audio_component.h	f!le	2021-10-31 20:53	3.79 KB	root / root	-rw-r--r--
drm_auth.h	f!le	2021-10-31 20:53	4.64 KB	root / root	-rw-r--r--
drm_blend.h	f!le	2021-10-31 20:53	2.35 KB	root / root	-rw-r--r--
drm_bridge.h	f!le	2024-11-06 9:28	33.55 KB	root / root	-rw-r--r--
drm_bridge_connector.h	f!le	2021-10-31 20:53	548 B	root / root	-rw-r--r--
drm_cache.h	f!le	2021-10-31 20:53	3.01 KB	root / root	-rw-r--r--
drm_client.h	f!le	2021-10-31 20:53	4.94 KB	root / root	-rw-r--r--
drm_color_mgmt.h	f!le	2024-11-06 9:28	3.82 KB	root / root	-rw-r--r--
drm_connector.h	f!le	2024-11-06 9:28	55.93 KB	root / root	-rw-r--r--
drm_crtc.h	f!le	2021-10-31 20:53	44.48 KB	root / root	-rw-r--r--
drm_crtc_helper.h	f!le	2021-10-31 20:53	2.39 KB	root / root	-rw-r--r--
drm_damage_helper.h	f!le	2021-10-31 20:53	3.33 KB	root / root	-rw-r--r--
drm_debugfs.h	f!le	2021-10-31 20:53	3.4 KB	root / root	-rw-r--r--
drm_debugfs_crc.h	f!le	2021-10-31 20:53	2.66 KB	root / root	-rw-r--r--
drm_device.h	f!le	2021-10-31 20:53	8.52 KB	root / root	-rw-r--r--
drm_displayid.h	f!le	2021-10-31 20:53	3.32 KB	root / root	-rw-r--r--
drm_dp_aux_bus.h	f!le	2021-10-31 20:53	1.7 KB	root / root	-rw-r--r--
drm_dp_dual_mode_helper.h	f!le	2021-10-31 20:53	4.62 KB	root / root	-rw-r--r--
drm_dp_helper.h	f!le	2024-11-06 9:28	87.67 KB	root / root	-rw-r--r--
drm_dp_mst_helper.h	f!le	2021-10-31 20:53	27.73 KB	root / root	-rw-r--r--
drm_drv.h	f!le	2021-10-31 20:53	18.67 KB	root / root	-rw-r--r--
drm_dsc.h	f!le	2021-10-31 20:53	16.29 KB	root / root	-rw-r--r--
drm_edid.h	f!le	2024-11-06 9:28	17.23 KB	root / root	-rw-r--r--
drm_encoder.h	f!le	2021-10-31 20:53	10.64 KB	root / root	-rw-r--r--
drm_encoder_slave.h	f!le	2021-10-31 20:53	6.44 KB	root / root	-rw-r--r--
drm_fb_cma_helper.h	f!le	2021-10-31 20:53	575 B	root / root	-rw-r--r--
drm_fb_helper.h	f!le	2024-11-06 9:28	12.7 KB	root / root	-rw-r--r--
drm_file.h	f!le	2021-10-31 20:53	12.12 KB	root / root	-rw-r--r--
drm_fixed.h	f!le	2024-11-06 9:28	4.71 KB	root / root	-rw-r--r--
drm_flip_work.h	f!le	2021-10-31 20:53	3.01 KB	root / root	-rw-r--r--
drm_format_helper.h	f!le	2021-10-31 20:53	1.49 KB	root / root	-rw-r--r--
drm_fourcc.h	f!le	2021-10-31 20:53	9.7 KB	root / root	-rw-r--r--
drm_framebuffer.h	f!le	2021-10-31 20:53	10.4 KB	root / root	-rw-r--r--
drm_gem.h	f!le	2021-10-31 20:53	11.8 KB	root / root	-rw-r--r--
drm_gem_atomic_helper.h	f!le	2021-10-31 20:53	4.61 KB	root / root	-rw-r--r--
drm_gem_cma_helper.h	f!le	2021-10-31 20:53	6.83 KB	root / root	-rw-r--r--
drm_gem_framebuffer_helpe...-.	f!le	2021-10-31 20:53	2.06 KB	root / root	-rw-r--r--
drm_gem_shmem_helper.h	f!le	2024-11-06 9:28	8.3 KB	root / root	-rw-r--r--
drm_gem_ttm_helper.h	f!le	2021-10-31 20:53	861 B	root / root	-rw-r--r--
drm_gem_vram_helper.h	f!le	2021-10-31 20:53	6.17 KB	root / root	-rw-r--r--
drm_hashtab.h	f!le	2021-10-31 20:53	3.01 KB	root / root	-rw-r--r--
drm_hdcp.h	f!le	2021-10-31 20:53	8.79 KB	root / root	-rw-r--r--
drm_ioctl.h	f!le	2021-10-31 20:53	6.23 KB	root / root	-rw-r--r--
drm_lease.h	f!le	2021-10-31 20:53	1010 B	root / root	-rw-r--r--
drm_legacy.h	f!le	2021-10-31 20:53	9.26 KB	root / root	-rw-r--r--
drm_managed.h	f!le	2021-10-31 20:53	3.35 KB	root / root	-rw-r--r--
drm_mipi_dbi.h	f!le	2021-10-31 20:53	4.72 KB	root / root	-rw-r--r--
drm_mipi_dsi.h	f!le	2024-11-06 9:28	11.28 KB	root / root	-rw-r--r--
drm_mm.h	f!le	2021-10-31 20:53	17.5 KB	root / root	-rw-r--r--
drm_mode_config.h	f!le	2021-10-31 20:53	32.24 KB	root / root	-rw-r--r--
drm_mode_object.h	f!le	2021-10-31 20:53	5.17 KB	root / root	-rw-r--r--
drm_modes.h	f!le	2021-10-31 20:53	18.18 KB	root / root	-rw-r--r--
drm_modeset_helper.h	f!le	2021-10-31 20:53	1.77 KB	root / root	-rw-r--r--
drm_modeset_helper_vtable...-.	f!le	2021-10-31 20:53	55.98 KB	root / root	-rw-r--r--
drm_modeset_lock.h	f!le	2021-10-31 20:53	6.8 KB	root / root	-rw-r--r--
drm_of.h	f!le	2021-10-31 20:53	4.11 KB	root / root	-rw-r--r--
drm_panel.h	f!le	2021-10-31 20:53	6.26 KB	root / root	-rw-r--r--
drm_pciids.h	f!le	2021-10-31 20:53	66.47 KB	root / root	-rw-r--r--
drm_plane.h	f!le	2021-10-31 20:53	28.48 KB	root / root	-rw-r--r--
drm_plane_helper.h	f!le	2021-10-31 20:53	1.75 KB	root / root	-rw-r--r--
drm_prime.h	f!le	2021-10-31 20:53	4.07 KB	root / root	-rw-r--r--
drm_print.h	f!le	2024-11-06 9:28	16.17 KB	root / root	-rw-r--r--
drm_probe_helper.h	f!le	2021-10-31 20:53	848 B	root / root	-rw-r--r--
drm_property.h	f!le	2021-10-31 20:53	11.76 KB	root / root	-rw-r--r--
drm_rect.h	f!le	2021-10-31 20:53	6.86 KB	root / root	-rw-r--r--
drm_scdc_helper.h	f!le	2021-10-31 20:53	4.34 KB	root / root	-rw-r--r--
drm_self_refresh_helper.h	f!le	2021-10-31 20:53	594 B	root / root	-rw-r--r--
drm_simple_kms_helper.h	f!le	2021-10-31 20:53	8.91 KB	root / root	-rw-r--r--
drm_syncobj.h	f!le	2021-10-31 20:53	3.85 KB	root / root	-rw-r--r--
drm_sysfs.h	f!le	2021-10-31 20:53	442 B	root / root	-rw-r--r--
drm_util.h	f!le	2021-10-31 20:53	2.58 KB	root / root	-rw-r--r--
drm_utils.h	f!le	2021-10-31 20:53	504 B	root / root	-rw-r--r--
drm_vblank.h	f!le	2021-10-31 20:53	9.04 KB	root / root	-rw-r--r--
drm_vblank_work.h	f!le	2021-10-31 20:53	1.91 KB	root / root	-rw-r--r--
drm_vma_manager.h	f!le	2021-10-31 20:53	8.15 KB	root / root	-rw-r--r--
drm_writeback.h	f!le	2021-10-31 20:53	4.05 KB	root / root	-rw-r--r--
gma_drm.h	f!le	2021-10-31 20:53	413 B	root / root	-rw-r--r--
gpu_scheduler.h	f!le	2021-10-31 20:53	15.44 KB	root / root	-rw-r--r--
gud.h	f!le	2021-10-31 20:53	11.58 KB	root / root	-rw-r--r--
i915_component.h	f!le	2021-10-31 20:53	1.76 KB	root / root	-rw-r--r--
i915_drm.h	f!le	2021-10-31 20:53	3.6 KB	root / root	-rw-r--r--
i915_mei_hdcp_interface.h	f!le	2021-10-31 20:53	5.76 KB	root / root	-rw-r--r--
i915_pciids.h	f!le	2024-11-06 9:28	21.31 KB	root / root	-rw-r--r--
intel-gtt.h	f!le	2021-10-31 20:53	996 B	root / root	-rw-r--r--
intel_lpe_audio.h	f!le	2021-10-31 20:53	1.72 KB	root / root	-rw-r--r--
spsc_queue.h	f!le	2021-10-31 20:53	3.06 KB	root / root	-rw-r--r--
task_barrier.h	f!le	2021-10-31 20:53	2.95 KB	root / root	-rw-r--r--