| /* |
| * 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_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. |
| * |
| * 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[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, |
| 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); |
| |
| #endif |