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// SPDX-License-Identifier: MIT
#include <linux/fb.h>
#include <drm/drm_drv.h>
#include <drm/drm_fbdev_shmem.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_gem_shmem_helper.h>
/*
* struct fb_ops
*/
static int drm_fbdev_shmem_fb_open(struct fb_info *info, int user)
{
struct drm_fb_helper *fb_helper = info->par;
/* No need to take a ref for fbcon because it unbinds on unregister */
if (user && !try_module_get(fb_helper->dev->driver->fops->owner))
return -ENODEV;
return 0;
}
static int drm_fbdev_shmem_fb_release(struct fb_info *info, int user)
{
struct drm_fb_helper *fb_helper = info->par;
if (user)
module_put(fb_helper->dev->driver->fops->owner);
return 0;
}
FB_GEN_DEFAULT_DEFERRED_SYSMEM_OPS(drm_fbdev_shmem,
drm_fb_helper_damage_range,
drm_fb_helper_damage_area);
static int drm_fbdev_shmem_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
struct drm_fb_helper *fb_helper = info->par;
struct drm_framebuffer *fb = fb_helper->fb;
struct drm_gem_object *obj = drm_gem_fb_get_obj(fb, 0);
struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
if (shmem->map_wc)
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
return fb_deferred_io_mmap(info, vma);
}
static void drm_fbdev_shmem_fb_destroy(struct fb_info *info)
{
struct drm_fb_helper *fb_helper = info->par;
if (!fb_helper->dev)
return;
fb_deferred_io_cleanup(info);
drm_fb_helper_fini(fb_helper);
drm_client_buffer_vunmap(fb_helper->buffer);
drm_client_framebuffer_delete(fb_helper->buffer);
drm_client_release(&fb_helper->client);
drm_fb_helper_unprepare(fb_helper);
kfree(fb_helper);
}
static const struct fb_ops drm_fbdev_shmem_fb_ops = {
.owner = THIS_MODULE,
.fb_open = drm_fbdev_shmem_fb_open,
.fb_release = drm_fbdev_shmem_fb_release,
__FB_DEFAULT_DEFERRED_OPS_RDWR(drm_fbdev_shmem),
DRM_FB_HELPER_DEFAULT_OPS,
__FB_DEFAULT_DEFERRED_OPS_DRAW(drm_fbdev_shmem),
.fb_mmap = drm_fbdev_shmem_fb_mmap,
.fb_destroy = drm_fbdev_shmem_fb_destroy,
};
static struct page *drm_fbdev_shmem_get_page(struct fb_info *info, unsigned long offset)
{
struct drm_fb_helper *fb_helper = info->par;
struct drm_framebuffer *fb = fb_helper->fb;
struct drm_gem_object *obj = drm_gem_fb_get_obj(fb, 0);
struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
unsigned int i = offset >> PAGE_SHIFT;
struct page *page;
if (fb_WARN_ON_ONCE(info, offset > obj->size))
return NULL;
page = shmem->pages[i]; // protected by active vmap
if (page)
get_page(page);
fb_WARN_ON_ONCE(info, !page);
return page;
}
/*
* struct drm_fb_helper
*/
static int drm_fbdev_shmem_helper_fb_dirty(struct drm_fb_helper *helper,
struct drm_clip_rect *clip)
{
struct drm_device *dev = helper->dev;
int ret;
/* Call damage handlers only if necessary */
if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2))
return 0;
if (helper->fb->funcs->dirty) {
ret = helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1);
if (drm_WARN_ONCE(dev, ret, "Dirty helper failed: ret=%d\n", ret))
return ret;
}
return 0;
}
static const struct drm_fb_helper_funcs drm_fbdev_shmem_helper_funcs = {
.fb_dirty = drm_fbdev_shmem_helper_fb_dirty,
};
/*
* struct drm_driver
*/
int drm_fbdev_shmem_driver_fbdev_probe(struct drm_fb_helper *fb_helper,
struct drm_fb_helper_surface_size *sizes)
{
struct drm_client_dev *client = &fb_helper->client;
struct drm_device *dev = fb_helper->dev;
struct drm_client_buffer *buffer;
struct drm_gem_shmem_object *shmem;
struct drm_framebuffer *fb;
struct fb_info *info;
u32 format;
struct iosys_map map;
int ret;
drm_dbg_kms(dev, "surface width(%d), height(%d) and bpp(%d)\n",
sizes->surface_width, sizes->surface_height,
sizes->surface_bpp);
format = drm_driver_legacy_fb_format(dev, sizes->surface_bpp, sizes->surface_depth);
buffer = drm_client_framebuffer_create(client, sizes->surface_width,
sizes->surface_height, format);
if (IS_ERR(buffer))
return PTR_ERR(buffer);
shmem = to_drm_gem_shmem_obj(buffer->gem);
fb = buffer->fb;
ret = drm_client_buffer_vmap(buffer, &map);
if (ret) {
goto err_drm_client_buffer_delete;
} else if (drm_WARN_ON(dev, map.is_iomem)) {
ret = -ENODEV; /* I/O memory not supported; use generic emulation */
goto err_drm_client_buffer_delete;
}
fb_helper->funcs = &drm_fbdev_shmem_helper_funcs;
fb_helper->buffer = buffer;
fb_helper->fb = fb;
info = drm_fb_helper_alloc_info(fb_helper);
if (IS_ERR(info)) {
ret = PTR_ERR(info);
goto err_drm_client_buffer_vunmap;
}
drm_fb_helper_fill_info(info, fb_helper, sizes);
info->fbops = &drm_fbdev_shmem_fb_ops;
/* screen */
info->flags |= FBINFO_VIRTFB; /* system memory */
if (!shmem->map_wc)
info->flags |= FBINFO_READS_FAST; /* signal caching */
info->screen_size = sizes->surface_height * fb->pitches[0];
info->screen_buffer = map.vaddr;
info->fix.smem_len = info->screen_size;
/* deferred I/O */
fb_helper->fbdefio.delay = HZ / 20;
fb_helper->fbdefio.get_page = drm_fbdev_shmem_get_page;
fb_helper->fbdefio.deferred_io = drm_fb_helper_deferred_io;
info->fbdefio = &fb_helper->fbdefio;
ret = fb_deferred_io_init(info);
if (ret)
goto err_drm_fb_helper_release_info;
return 0;
err_drm_fb_helper_release_info:
drm_fb_helper_release_info(fb_helper);
err_drm_client_buffer_vunmap:
fb_helper->fb = NULL;
fb_helper->buffer = NULL;
drm_client_buffer_vunmap(buffer);
err_drm_client_buffer_delete:
drm_client_framebuffer_delete(buffer);
return ret;
}
EXPORT_SYMBOL(drm_fbdev_shmem_driver_fbdev_probe);
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