| Message ID | 20240312154834.26178-8-tzimmermann@suse.de |
|---|---|
| State | Superseded |
| Headers | show |
| Series | drm: Provide fbdev emulation per memory manager | expand |
Thomas Zimmermann <tzimmermann@suse.de> writes: > 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 GEM-shmem > objects. > > Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> > --- Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
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
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(+)