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// SPDX-License-Identifier: GPL-2.0-or-later
#include <drm/drm_atomic_state_helper.h>
#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_simple_kms_helper.h>
#include "drm_internal.h"
/**
* DOC: overview
*
* The GEM atomic helpers library implements generic atomic-commit
* functions for drivers that use GEM objects. Currently, it provides
* plane state and framebuffer BO mappings for planes with shadow
* buffers.
*/
/*
* Shadow-buffered Planes
*/
static struct drm_plane_state *
drm_gem_duplicate_shadow_plane_state(struct drm_plane *plane)
{
struct drm_plane_state *plane_state = plane->state;
struct drm_shadow_plane_state *new_shadow_plane_state;
if (!plane_state)
return NULL;
new_shadow_plane_state = kzalloc(sizeof(*new_shadow_plane_state), GFP_KERNEL);
if (!new_shadow_plane_state)
return NULL;
__drm_atomic_helper_plane_duplicate_state(plane, &new_shadow_plane_state->base);
return &new_shadow_plane_state->base;
}
static void drm_gem_destroy_shadow_plane_state(struct drm_plane *plane,
struct drm_plane_state *plane_state)
{
struct drm_shadow_plane_state *shadow_plane_state =
to_drm_shadow_plane_state(plane_state);
__drm_atomic_helper_plane_destroy_state(&shadow_plane_state->base);
kfree(shadow_plane_state);
}
static void drm_gem_reset_shadow_plane(struct drm_plane *plane)
{
struct drm_shadow_plane_state *shadow_plane_state;
if (plane->state) {
drm_gem_destroy_shadow_plane_state(plane, plane->state);
plane->state = NULL; /* must be set to NULL here */
}
shadow_plane_state = kzalloc(sizeof(*shadow_plane_state), GFP_KERNEL);
if (!shadow_plane_state)
return;
__drm_atomic_helper_plane_reset(plane, &shadow_plane_state->base);
}
static int drm_gem_prepare_shadow_fb(struct drm_plane *plane, struct drm_plane_state *plane_state)
{
struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
struct drm_framebuffer *fb = plane_state->fb;
struct drm_gem_object *obj;
struct dma_buf_map map;
int ret;
size_t i;
if (!fb)
return 0;
ret = drm_gem_fb_prepare_fb(plane, plane_state);
if (ret)
return ret;
for (i = 0; i < ARRAY_SIZE(shadow_plane_state->map); ++i) {
obj = drm_gem_fb_get_obj(fb, i);
if (!obj)
continue;
ret = drm_gem_vmap(obj, &map);
if (ret)
goto err_drm_gem_vunmap;
shadow_plane_state->map[i] = map;
}
return 0;
err_drm_gem_vunmap:
while (i) {
--i;
obj = drm_gem_fb_get_obj(fb, i);
if (!obj)
continue;
drm_gem_vunmap(obj, &shadow_plane_state->map[i]);
}
return ret;
}
static void drm_gem_cleanup_shadow_fb(struct drm_plane *plane, struct drm_plane_state *plane_state)
{
struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
struct drm_framebuffer *fb = plane_state->fb;
size_t i = ARRAY_SIZE(shadow_plane_state->map);
struct drm_gem_object *obj;
if (!fb)
return;
while (i) {
--i;
obj = drm_gem_fb_get_obj(fb, i);
if (!obj)
continue;
drm_gem_vunmap(obj, &shadow_plane_state->map[i]);
}
}
/**
* drm_gem_simple_kms_prepare_shadow_fb - prepares shadow framebuffers
* @pipe: the simple display pipe
* @plane_state: the plane state of type struct drm_shadow_plane_state
*
* This function implements struct drm_simple_display_funcs.prepare_fb. It
* maps all buffer objects of the plane's framebuffer into kernel address
* space and stores them in struct drm_shadow_plane_state.map. The
* framebuffer will be synchronized as part of the atomic commit.
*
* See drm_gem_simple_kms_cleanup_shadow_fb() for cleanup.
*
* Returns:
* 0 on success, or a negative errno code otherwise.
*/
int drm_gem_simple_kms_prepare_shadow_fb(struct drm_simple_display_pipe *pipe,
struct drm_plane_state *plane_state)
{
return drm_gem_prepare_shadow_fb(&pipe->plane, plane_state);
}
EXPORT_SYMBOL(drm_gem_simple_kms_prepare_shadow_fb);
/**
* drm_gem_simple_kms_cleanup_shadow_fb - releases shadow framebuffers
* @pipe: the simple display pipe
* @plane_state: the plane state of type struct drm_shadow_plane_state
*
* This function implements struct drm_simple_display_funcs.cleanup_fb.
* This function unmaps all buffer objects of the plane's framebuffer.
*
* See drm_gem_simple_kms_prepare_shadow_fb().
*/
void drm_gem_simple_kms_cleanup_shadow_fb(struct drm_simple_display_pipe *pipe,
struct drm_plane_state *plane_state)
{
drm_gem_cleanup_shadow_fb(&pipe->plane, plane_state);
}
EXPORT_SYMBOL(drm_gem_simple_kms_cleanup_shadow_fb);
/**
* drm_gem_simple_kms_reset_shadow_plane - resets a shadow-buffered plane
* @pipe: the simple display pipe
*
* This function implements struct drm_simple_display_funcs.reset_plane
* for shadow-buffered planes.
*/
void drm_gem_simple_kms_reset_shadow_plane(struct drm_simple_display_pipe *pipe)
{
drm_gem_reset_shadow_plane(&pipe->plane);
}
EXPORT_SYMBOL(drm_gem_simple_kms_reset_shadow_plane);
/**
* drm_gem_simple_kms_duplicate_shadow_plane_state - duplicates shadow-buffered plane state
* @pipe: the simple display pipe
*
* This function implements struct drm_simple_display_funcs.duplicate_plane_state
* for shadow-buffered planes. It does not duplicate existing mappings of the shadow
* buffers. Mappings are maintained during the atomic commit by the plane's prepare_fb
* and cleanup_fb helpers.
*
* Returns:
* A pointer to a new plane state on success, or NULL otherwise.
*/
struct drm_plane_state *
drm_gem_simple_kms_duplicate_shadow_plane_state(struct drm_simple_display_pipe *pipe)
{
return drm_gem_duplicate_shadow_plane_state(&pipe->plane);
}
EXPORT_SYMBOL(drm_gem_simple_kms_duplicate_shadow_plane_state);
/**
* drm_gem_simple_kms_destroy_shadow_plane_state - resets shadow-buffered plane state
* @pipe: the simple display pipe
* @plane_state: the plane state of type struct drm_shadow_plane_state
*
* This function implements struct drm_simple_display_funcs.destroy_plane_state
* for shadow-buffered planes. It expects that mappings of shadow buffers
* have been released already.
*/
void drm_gem_simple_kms_destroy_shadow_plane_state(struct drm_simple_display_pipe *pipe,
struct drm_plane_state *plane_state)
{
drm_gem_destroy_shadow_plane_state(&pipe->plane, plane_state);
}
EXPORT_SYMBOL(drm_gem_simple_kms_destroy_shadow_plane_state);
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