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fbdev/deferred-io: Provide get_page hook in struct fb_deferred_io

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Add a callback for drivers to provide framebuffer pages to fbdev's
deferred-I/O helpers. Implementations need to acquire a reference on
the page before returning it. Returning NULL generates a SIGBUS
signal.

This will be useful for DRM's fbdev emulation with GEM-shmem buffer
objects.

v2:
- fix typo in commit message (Javier)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240419083331.7761-8-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2024-04-19 10:29:00 +02:00
parent 1ecbc7dd29
commit 747bda7bb5
2 changed files with 5 additions and 0 deletions
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4
drivers/video/fbdev/core/fb_defio.c
View file

@ -25,9 +25,13 @@
static struct page *fb_deferred_io_get_page(struct fb_info *info, unsigned long offs)
{
struct fb_deferred_io *fbdefio = info->fbdefio;
const void *screen_buffer = info->screen_buffer;
struct page *page = NULL;
if (fbdefio->get_page)
return fbdefio->get_page(info, offs);
if (is_vmalloc_addr(screen_buffer + offs))
page = vmalloc_to_page(screen_buffer + offs);
else if (info->fix.smem_start)

1
include/linux/fb.h
View file

@ -225,6 +225,7 @@ struct fb_deferred_io {
struct mutex lock; /* mutex that protects the pageref list */
struct list_head pagereflist; /* list of pagerefs for touched pages */
/* callback */
struct page *(*get_page)(struct fb_info *info, unsigned long offset);
void (*deferred_io)(struct fb_info *info, struct list_head *pagelist);
};
#endif