linux-kernel - Re: [PATCH 1/2] drm/vram: store dumb bo dimensions.

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Date:   Thu, 27 Jun 2019 09:57:28 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Gerd Hoffmann <kraxel@...hat.com>, dri-devel@...ts.freedesktop.org
Cc:     Maxime Ripard <maxime.ripard@...tlin.com>,
        open list <linux-kernel@...r.kernel.org>,
        David Airlie <airlied@...ux.ie>, Sean Paul <sean@...rly.run>
Subject: Re: [PATCH 1/2] drm/vram: store dumb bo dimensions.

Hi

Am 26.06.19 um 08:55 schrieb Gerd Hoffmann:
> Store width and height of the bo.  Needed in case userspace
> sets up a framebuffer with fb->width != bo->width..

This seems like bug. I'd rather return an error to userspace if the BO
is incompatible.

For the Gnome issue, a fix would be to program the display HW's line
pitch to the correct value.

Best regards
Thomas

> Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
> ---
>  include/drm/drm_gem_vram_helper.h     | 1 +
>  drivers/gpu/drm/drm_gem_vram_helper.c | 2 ++
>  2 files changed, 3 insertions(+)
> 
> diff --git a/include/drm/drm_gem_vram_helper.h b/include/drm/drm_gem_vram_helper.h
> index 1a0ea18e7a74..3692dba167df 100644
> --- a/include/drm/drm_gem_vram_helper.h
> +++ b/include/drm/drm_gem_vram_helper.h
> @@ -39,6 +39,7 @@ struct drm_gem_vram_object {
>  	struct drm_gem_object gem;
>  	struct ttm_buffer_object bo;
>  	struct ttm_bo_kmap_obj kmap;
> +	unsigned int width, height;
>  
>  	/* Supported placements are %TTM_PL_VRAM and %TTM_PL_SYSTEM */
>  	struct ttm_placement placement;
> diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c b/drivers/gpu/drm/drm_gem_vram_helper.c
> index 4de782ca26b2..c02bf7694117 100644
> --- a/drivers/gpu/drm/drm_gem_vram_helper.c
> +++ b/drivers/gpu/drm/drm_gem_vram_helper.c
> @@ -377,6 +377,8 @@ int drm_gem_vram_fill_create_dumb(struct drm_file *file,
>  	gbo = drm_gem_vram_create(dev, bdev, size, pg_align, interruptible);
>  	if (IS_ERR(gbo))
>  		return PTR_ERR(gbo);
> +	gbo->width = args->width;
> +	gbo->height = args->height;
>  
>  	ret = drm_gem_handle_create(file, &gbo->gem, &handle);
>  	if (ret)
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Linux GmbH, Maxfeldstrasse 5, 90409 Nuernberg, Germany
GF: Felix Imendörffer, Mary Higgins, Sri Rasiah
HRB 21284 (AG Nürnberg)



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