286 lines
9.4 KiB
C
286 lines
9.4 KiB
C
/*
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* Copyright (c) 2016 Intel Corporation
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#ifndef __DRM_FRAMEBUFFER_H__
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#define __DRM_FRAMEBUFFER_H__
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#include <linux/list.h>
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#include <linux/ctype.h>
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#include <drm/drm_mode_object.h>
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struct drm_framebuffer;
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struct drm_file;
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struct drm_device;
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/**
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* struct drm_framebuffer_funcs - framebuffer hooks
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*/
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struct drm_framebuffer_funcs {
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/**
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* @destroy:
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*
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* Clean up framebuffer resources, specifically also unreference the
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* backing storage. The core guarantees to call this function for every
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* framebuffer successfully created by ->fb_create() in
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* &drm_mode_config_funcs. Drivers must also call
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* drm_framebuffer_cleanup() to release DRM core resources for this
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* framebuffer.
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*/
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void (*destroy)(struct drm_framebuffer *framebuffer);
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/**
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* @create_handle:
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*
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* Create a buffer handle in the driver-specific buffer manager (either
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* GEM or TTM) valid for the passed-in struct &drm_file. This is used by
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* the core to implement the GETFB IOCTL, which returns (for
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* sufficiently priviledged user) also a native buffer handle. This can
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* be used for seamless transitions between modesetting clients by
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* copying the current screen contents to a private buffer and blending
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* between that and the new contents.
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*
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* GEM based drivers should call drm_gem_handle_create() to create the
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* handle.
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*
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* RETURNS:
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*
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* 0 on success or a negative error code on failure.
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*/
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int (*create_handle)(struct drm_framebuffer *fb,
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struct drm_file *file_priv,
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unsigned int *handle);
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/**
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* @dirty:
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*
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* Optional callback for the dirty fb IOCTL.
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*
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* Userspace can notify the driver via this callback that an area of the
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* framebuffer has changed and should be flushed to the display
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* hardware. This can also be used internally, e.g. by the fbdev
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* emulation, though that's not the case currently.
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*
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* See documentation in drm_mode.h for the struct drm_mode_fb_dirty_cmd
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* for more information as all the semantics and arguments have a one to
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* one mapping on this function.
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*
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* RETURNS:
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*
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* 0 on success or a negative error code on failure.
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*/
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int (*dirty)(struct drm_framebuffer *framebuffer,
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struct drm_file *file_priv, unsigned flags,
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unsigned color, struct drm_clip_rect *clips,
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unsigned num_clips);
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};
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/**
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* struct drm_framebuffer - frame buffer object
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*
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* Note that the fb is refcounted for the benefit of driver internals,
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* for example some hw, disabling a CRTC/plane is asynchronous, and
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* scanout does not actually complete until the next vblank. So some
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* cleanup (like releasing the reference(s) on the backing GEM bo(s))
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* should be deferred. In cases like this, the driver would like to
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* hold a ref to the fb even though it has already been removed from
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* userspace perspective. See drm_framebuffer_reference() and
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* drm_framebuffer_unreference().
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*
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* The refcount is stored inside the mode object @base.
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*/
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struct drm_framebuffer {
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/**
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* @dev: DRM device this framebuffer belongs to
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*/
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struct drm_device *dev;
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/**
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* @head: Place on the dev->mode_config.fb_list, access protected by
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* dev->mode_config.fb_lock.
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*/
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struct list_head head;
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/**
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* @base: base modeset object structure, contains the reference count.
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*/
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struct drm_mode_object base;
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/**
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* @funcs: framebuffer vfunc table
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*/
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const struct drm_framebuffer_funcs *funcs;
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/**
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* @pitches: Line stride per buffer. For userspace created object this
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* is copied from drm_mode_fb_cmd2.
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*/
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unsigned int pitches[4];
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/**
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* @offsets: Offset from buffer start to the actual pixel data in bytes,
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* per buffer. For userspace created object this is copied from
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* drm_mode_fb_cmd2.
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*
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* Note that this is a linear offset and does not take into account
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* tiling or buffer laytou per @modifier. It meant to be used when the
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* actual pixel data for this framebuffer plane starts at an offset,
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* e.g. when multiple planes are allocated within the same backing
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* storage buffer object. For tiled layouts this generally means it
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* @offsets must at least be tile-size aligned, but hardware often has
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* stricter requirements.
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*
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* This should not be used to specifiy x/y pixel offsets into the buffer
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* data (even for linear buffers). Specifying an x/y pixel offset is
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* instead done through the source rectangle in struct &drm_plane_state.
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*/
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unsigned int offsets[4];
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/**
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* @modifier: Data layout modifier. This is used to describe
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* tiling, or also special layouts (like compression) of auxiliary
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* buffers. For userspace created object this is copied from
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* drm_mode_fb_cmd2.
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*/
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uint64_t modifier;
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/**
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* @width: Logical width of the visible area of the framebuffer, in
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* pixels.
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*/
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unsigned int width;
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/**
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* @height: Logical height of the visible area of the framebuffer, in
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* pixels.
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*/
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unsigned int height;
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/**
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* @depth: Depth in bits per pixel for RGB formats. 0 for everything
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* else. Legacy information derived from @pixel_format, it's suggested to use
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* the DRM FOURCC codes and helper functions directly instead.
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*/
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unsigned int depth;
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/**
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* @bits_per_pixel: Storage used bits per pixel for RGB formats. 0 for
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* everything else. Legacy information derived from @pixel_format, it's
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* suggested to use the DRM FOURCC codes and helper functions directly
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* instead.
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*/
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int bits_per_pixel;
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/**
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* @flags: Framebuffer flags like DRM_MODE_FB_INTERLACED or
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* DRM_MODE_FB_MODIFIERS.
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*/
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int flags;
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/**
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* @pixel_format: DRM FOURCC code describing the pixel format.
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*/
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uint32_t pixel_format; /* fourcc format */
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/**
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* @hot_x: X coordinate of the cursor hotspot. Used by the legacy cursor
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* IOCTL when the driver supports cursor through a DRM_PLANE_TYPE_CURSOR
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* universal plane.
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*/
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int hot_x;
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/**
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* @hot_y: Y coordinate of the cursor hotspot. Used by the legacy cursor
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* IOCTL when the driver supports cursor through a DRM_PLANE_TYPE_CURSOR
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* universal plane.
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*/
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int hot_y;
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/**
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* @filp_head: Placed on struct &drm_file fbs list_head, protected by
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* fbs_lock in the same structure.
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*/
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struct list_head filp_head;
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};
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#define obj_to_fb(x) container_of(x, struct drm_framebuffer, base)
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int drm_framebuffer_init(struct drm_device *dev,
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struct drm_framebuffer *fb,
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const struct drm_framebuffer_funcs *funcs);
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struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev,
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uint32_t id);
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void drm_framebuffer_remove(struct drm_framebuffer *fb);
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void drm_framebuffer_cleanup(struct drm_framebuffer *fb);
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void drm_framebuffer_unregister_private(struct drm_framebuffer *fb);
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/**
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* drm_framebuffer_reference - incr the fb refcnt
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* @fb: framebuffer
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*
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* This functions increments the fb's refcount.
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*/
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static inline void drm_framebuffer_reference(struct drm_framebuffer *fb)
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{
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drm_mode_object_reference(&fb->base);
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}
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/**
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* drm_framebuffer_unreference - unref a framebuffer
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* @fb: framebuffer to unref
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*
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* This functions decrements the fb's refcount and frees it if it drops to zero.
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*/
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static inline void drm_framebuffer_unreference(struct drm_framebuffer *fb)
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{
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drm_mode_object_unreference(&fb->base);
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}
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/**
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* drm_framebuffer_read_refcount - read the framebuffer reference count.
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* @fb: framebuffer
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*
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* This functions returns the framebuffer's reference count.
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*/
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static inline uint32_t drm_framebuffer_read_refcount(struct drm_framebuffer *fb)
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{
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return atomic_read(&fb->base.refcount.refcount);
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}
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/**
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* drm_framebuffer_assign - store a reference to the fb
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* @p: location to store framebuffer
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* @fb: new framebuffer (maybe NULL)
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*
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* This functions sets the location to store a reference to the framebuffer,
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* unreferencing the framebuffer that was previously stored in that location.
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*/
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static inline void drm_framebuffer_assign(struct drm_framebuffer **p,
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struct drm_framebuffer *fb)
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{
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if (fb)
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drm_framebuffer_reference(fb);
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if (*p)
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drm_framebuffer_unreference(*p);
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*p = fb;
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}
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/*
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* drm_for_each_fb - iterate over all framebuffers
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* @fb: the loop cursor
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* @dev: the DRM device
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*
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* Iterate over all framebuffers of @dev. User must hold the fb_lock from
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* &drm_mode_config.
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*/
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#define drm_for_each_fb(fb, dev) \
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for (WARN_ON(!mutex_is_locked(&(dev)->mode_config.fb_lock)), \
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fb = list_first_entry(&(dev)->mode_config.fb_list, \
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struct drm_framebuffer, head); \
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&fb->head != (&(dev)->mode_config.fb_list); \
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fb = list_next_entry(fb, head))
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#endif
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