268 строки
8.9 KiB
C
268 строки
8.9 KiB
C
/*
|
|
* 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 ->fb_create() in
|
|
* &drm_mode_config_funcs. 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_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;
|
|
/**
|
|
* @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: 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;
|
|
};
|
|
|
|
#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_reference - incr the fb refcnt
|
|
* @fb: framebuffer
|
|
*
|
|
* This functions increments the fb's refcount.
|
|
*/
|
|
static inline void drm_framebuffer_reference(struct drm_framebuffer *fb)
|
|
{
|
|
drm_mode_object_reference(&fb->base);
|
|
}
|
|
|
|
/**
|
|
* drm_framebuffer_unreference - unref a framebuffer
|
|
* @fb: framebuffer to unref
|
|
*
|
|
* This functions decrements the fb's refcount and frees it if it drops to zero.
|
|
*/
|
|
static inline void drm_framebuffer_unreference(struct drm_framebuffer *fb)
|
|
{
|
|
drm_mode_object_unreference(&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(struct drm_framebuffer *fb)
|
|
{
|
|
return atomic_read(&fb->base.refcount.refcount);
|
|
}
|
|
|
|
/**
|
|
* 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 the fb_lock from
|
|
* &drm_mode_config.
|
|
*/
|
|
#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))
|
|
#endif
|