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=summ...

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 stable@vger.kernel.org know about it.

From cd9f7f7ac5932129fe81b4c7559cfcb226ec7c5c Mon Sep 17 00:00:00 2001

From: Thomas Zimmermann tzimmermann@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 tzimmermann@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 tzimmermann@suse.de Fixes: d536540f304c ("drm/fb-helper: Add generic fbdev emulation .fb_probe function") Reviewed-by: Daniel Vetter daniel.vetter@ffwll.ch Cc: dri-devel@lists.freedesktop.org Cc: stable@vger.kernel.org # v4.19+ Link: https://patchwork.freedesktop.org/patch/msgid/20220201115305.9333-1-tzimmerm... Signed-off-by: Greg Kroah-Hartman gregkh@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 tzimmermann@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