From 747bda7bb5b1644a06734900326847a5d353c448 Mon Sep 17 00:00:00 2001 From: Thomas Zimmermann Date: Fri, 19 Apr 2024 10:29:00 +0200 Subject: [PATCH] fbdev/deferred-io: Provide get_page hook in struct fb_deferred_io 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 Reviewed-by: Javier Martinez Canillas Link: https://patchwork.freedesktop.org/patch/msgid/20240419083331.7761-8-tzimmermann@suse.de --- drivers/video/fbdev/core/fb_defio.c | 4 ++++ include/linux/fb.h | 1 + 2 files changed, 5 insertions(+) diff --git a/drivers/video/fbdev/core/fb_defio.c b/drivers/video/fbdev/core/fb_defio.c index c68c51d0ef70e..5ee7e78c2cea0 100644 --- a/drivers/video/fbdev/core/fb_defio.c +++ b/drivers/video/fbdev/core/fb_defio.c @@ -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) diff --git a/include/linux/fb.h b/include/linux/fb.h index 811e47f9d1c3f..5358edbb9c0b7 100644 --- a/include/linux/fb.h +++ b/include/linux/fb.h @@ -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 -- 2.47.2