[PATCH] drm/fb-helper: Mark screen buffers in system memory with FB_VIRTFB
Thomas Zimmermann
tzimmermann at suse.de
Thu Jan 27 10:29:52 UTC 2022
Am 27.01.22 um 11:26 schrieb Thomas Zimmermann:
> Mark screen buffers in system memory with FB_VIRTFB. Otherwise, the
FBINFO_ is the name. Will be fixed before merging
> buffers are mmap'ed as I/O memory (i.e., VM_IO). For shadow buffers,
> also set the FB_READS_FAST hint.
>
> Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
> ---
> drivers/gpu/drm/drm_fb_helper.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index ed43b987d306..f15127a32f7a 100644
> --- 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(struct drm_fb_helper *fb_helper,
> 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(struct drm_fb_helper *fb_helper,
> 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
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
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