[PATCH 07/43] fbdev/deferred-io: Provide get_page hook in struct fb_deferred_io
From: Thomas Zimmermann <tzimmermann@suse.de>
Date: 2024-03-12 15:49:20
Also in:
dri-devel
Subsystem:
arc framebuffer driver, framebuffer core, framebuffer layer, the rest · Maintainers:
Jaya Kumar, Simona Vetter, Helge Deller, Linus Torvalds
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-shemem buffer objects. Signed-off-by: Thomas Zimmermann <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 6e0bbcfdb01b5..51928ff7961a5 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 708e6a177b1be..bbb0805c0ab1e 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h@@ -219,6 +219,7 @@ 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
--
2.44.0