diff options
Diffstat (limited to 'include/drm/drm_framebuffer.h')
| -rw-r--r-- | include/drm/drm_framebuffer.h | 106 |
1 files changed, 93 insertions, 13 deletions
diff --git a/include/drm/drm_framebuffer.h b/include/drm/drm_framebuffer.h index 46abdace8fa5..50deb40d3bfd 100644 --- a/include/drm/drm_framebuffer.h +++ b/include/drm/drm_framebuffer.h @@ -92,37 +92,117 @@ struct drm_framebuffer_funcs { 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_reference() and + * drm_framebuffer_unreference(). + * + * The refcount is stored inside the mode object @base. + */ struct drm_framebuffer { + /** + * @dev: DRM device this framebuffer belongs to + */ struct drm_device *dev; - /* - * 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. - * The refcount is stored inside the mode object. - */ - /* - * Place on the dev->mode_config.fb_list, access protected by + /** + * @head: Place on the dev->mode_config.fb_list, access protected by * dev->mode_config.fb_lock. */ struct list_head head; + + /** + * @base: base modeset object structure, contains the reference count. + */ struct drm_mode_object base; + /** + * @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, per buffer. 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[4]; + /** + * @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; - /* depth can be 15 or 16 */ + /** + * @depth: Depth in bits per pixel for RGB formats. 0 for everything + * else. Legacy information derived from @pixel_format, it's suggested to use + * the DRM FOURCC codes and helper functions directly instead. + */ unsigned int depth; + /** + * @bits_per_pixel: Storage used bits per pixel for RGB formats. 0 for + * everything else. Legacy information derived from @pixel_format, it's + * suggested to use the DRM FOURCC codes and helper functions directly + * instead. + */ int bits_per_pixel; + /** + * @flags: Framebuffer flags like DRM_MODE_FB_INTERLACED or + * DRM_MODE_FB_MODIFIERS. + */ int flags; + /** + * @pixel_format: DRM FOURCC code describing the pixel format. + */ uint32_t pixel_format; /* fourcc format */ + /** + * @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 struct &drm_file fbs list_head, protected by + * fbs_lock in the same structure. + */ struct list_head filp_head; }; |