This is a note to let you know that I've just added the patch titled
drm/fb-helper: Mark screen buffers in system memory with FBINFO_VIRTFB
to the 5.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-fb-helper-mark-screen-buffers-in-system-memory-with-fbinfo_virtfb.patch
and it can be found in the queue-5.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <sta...@vger.kernel.org> know about it.
>From cd9f7f7ac5932129fe81b4c7559cfcb226ec7c5c Mon Sep 17 00:00:00 2001
From: Thomas Zimmermann <tzimmerm...@suse.de>
Date: Tue, 1 Feb 2022 12:53:05 +0100
Subject: drm/fb-helper: Mark screen buffers in system memory with FBINFO_VIRTFB
From: Thomas Zimmermann <tzimmerm...@suse.de>
commit cd9f7f7ac5932129fe81b4c7559cfcb226ec7c5c upstream.
Mark screen buffers in system memory with FBINFO_VIRTFB. Otherwise, fbdev
deferred I/O marks mmap'ed areas of system memory with VM_IO. (There's an
inverse relationship between the two flags.)
For shadow buffers, also set the FBINFO_READS_FAST hint.
v3:
* change FB_ to FBINFO_ in commit description
v2:
* updated commit description (Daniel)
* added Fixes tag
Signed-off-by: Thomas Zimmermann <tzimmerm...@suse.de>
Fixes: d536540f304c ("drm/fb-helper: Add generic fbdev emulation .fb_probe
function")
Reviewed-by: Daniel Vetter <daniel.vet...@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
Cc: <sta...@vger.kernel.org> # v4.19+
Link:
https://patchwork.freedesktop.org/patch/msgid/20220201115305.9333-1-tzimmerm...@suse.de
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/gpu/drm/drm_fb_helper.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -2346,6 +2346,7 @@ static int drm_fb_helper_generic_probe(s
fbi->fbops = &drm_fbdev_fb_ops;
fbi->screen_size = sizes->surface_height * fb->pitches[0];
fbi->fix.smem_len = fbi->screen_size;
+ fbi->flags = FBINFO_DEFAULT;
drm_fb_helper_fill_info(fbi, fb_helper, sizes);
@@ -2353,19 +2354,21 @@ static int drm_fb_helper_generic_probe(s
fbi->screen_buffer = vzalloc(fbi->screen_size);
if (!fbi->screen_buffer)
return -ENOMEM;
+ fbi->flags |= FBINFO_VIRTFB | FBINFO_READS_FAST;
fbi->fbdefio = &drm_fbdev_defio;
-
fb_deferred_io_init(fbi);
} else {
/* buffer is mapped for HW framebuffer */
ret = drm_client_buffer_vmap(fb_helper->buffer, &map);
if (ret)
return ret;
- if (map.is_iomem)
+ if (map.is_iomem) {
fbi->screen_base = map.vaddr_iomem;
- else
+ } else {
fbi->screen_buffer = map.vaddr;
+ fbi->flags |= FBINFO_VIRTFB;
+ }
/*
* Shamelessly leak the physical address to user-space. As
Patches currently in stable-queue which might be from tzimmerm...@suse.de are
queue-5.17/fbdev-hot-unplug-firmware-fb-devices-on-forced-removal.patch
queue-5.17/drm-fb-helper-mark-screen-buffers-in-system-memory-with-fbinfo_virtfb.patch
queue-5.17/drm-simpledrm-add-panel-orientation-property-on-non-upright-mounted-lcd-panels.patch
queue-5.17/mgag200-fix-memmapsl-configuration-in-gctl6-register.patch
