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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2015 MediaTek Inc.
*/
#include <drm/drmP.h>
#include <drm/drm_modeset_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_gem.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <linux/dma-buf.h>
#include <linux/reservation.h>
#include "mtk_drm_drv.h"
#include "mtk_drm_fb.h"
#include "mtk_drm_gem.h"
static const struct drm_framebuffer_funcs mtk_drm_fb_funcs = {
.create_handle = drm_gem_fb_create_handle,
.destroy = drm_gem_fb_destroy,
};
static struct drm_framebuffer *mtk_drm_framebuffer_init(struct drm_device *dev,
const struct drm_mode_fb_cmd2 *mode,
struct drm_gem_object *obj)
{
struct drm_framebuffer *fb;
int ret;
if (drm_format_num_planes(mode->pixel_format) != 1)
return ERR_PTR(-EINVAL);
fb = kzalloc(sizeof(*fb), GFP_KERNEL);
if (!fb)
return ERR_PTR(-ENOMEM);
drm_helper_mode_fill_fb_struct(dev, fb, mode);
fb->obj[0] = obj;
ret = drm_framebuffer_init(dev, fb, &mtk_drm_fb_funcs);
if (ret) {
DRM_ERROR("failed to initialize framebuffer\n");
kfree(fb);
return ERR_PTR(ret);
}
return fb;
}
/*
* Wait for any exclusive fence in fb's gem object's reservation object.
*
* Returns -ERESTARTSYS if interrupted, else 0.
*/
int mtk_fb_wait(struct drm_framebuffer *fb)
{
struct drm_gem_object *gem;
struct reservation_object *resv;
long ret;
if (!fb)
return 0;
gem = fb->obj[0];
if (!gem || !gem->dma_buf || !gem->dma_buf->resv)
return 0;
resv = gem->dma_buf->resv;
ret = reservation_object_wait_timeout_rcu(resv, false, true,
MAX_SCHEDULE_TIMEOUT);
/* MAX_SCHEDULE_TIMEOUT on success, -ERESTARTSYS if interrupted */
if (WARN_ON(ret < 0))
return ret;
return 0;
}
struct drm_framebuffer *mtk_drm_mode_fb_create(struct drm_device *dev,
struct drm_file *file,
const struct drm_mode_fb_cmd2 *cmd)
{
struct drm_framebuffer *fb;
struct drm_gem_object *gem;
unsigned int width = cmd->width;
unsigned int height = cmd->height;
unsigned int size, bpp;
int ret;
if (drm_format_num_planes(cmd->pixel_format) != 1)
return ERR_PTR(-EINVAL);
gem = drm_gem_object_lookup(file, cmd->handles[0]);
if (!gem)
return ERR_PTR(-ENOENT);
bpp = drm_format_plane_cpp(cmd->pixel_format, 0);
size = (height - 1) * cmd->pitches[0] + width * bpp;
size += cmd->offsets[0];
if (gem->size < size) {
ret = -EINVAL;
goto unreference;
}
fb = mtk_drm_framebuffer_init(dev, cmd, gem);
if (IS_ERR(fb)) {
ret = PTR_ERR(fb);
goto unreference;
}
return fb;
unreference:
drm_gem_object_put_unlocked(gem);
return ERR_PTR(ret);
}
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