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References: <20210318230351.982064-1-lyude@redhat.com>
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From:   Ben Skeggs <skeggsb@gmail.com>
Date:   Thu, 25 Mar 2021 09:24:08 +1000
Message-ID: <CACAvsv72yRdtsRRWUx183XWEAOU3NSjjsYhEbKSGy=sQ+zdwKQ@mail.gmail.com>
Subject: Re: [PATCH v2] drm/nouveau/kms/nv50-: Correct size checks for cursors
To:     Lyude Paul <lyude@redhat.com>
Cc:     ML nouveau <nouveau@lists.freedesktop.org>,
        David Airlie <airlied@linux.ie>,
        open list <linux-kernel@vger.kernel.org>,
        "open list:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS" 
        <dri-devel@lists.freedesktop.org>,
        Jeremy Cline <jcline@redhat.com>,
        Ben Skeggs <bskeggs@redhat.com>,
        Martin Peres <martin.peres@mupuf.org>
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On Fri, 19 Mar 2021 at 09:04, Lyude Paul <lyude@redhat.com> wrote:
>
> Found this while trying to make some changes to the kms_cursor_crc test.
> curs507a_acquire checks that the width and height of the cursor framebuffer
> are equal (asyw->image.{w,h}). This isn't entirely correct though, as the
> height of the cursor can be larger than the size of the cursor, as long as
> the width is the same as the cursor size and there's no framebuffer offset.
>
> Note that I'm not entirely sure why this wasn't previously breaking
> kms_cursor_crc tests - they all set up cursors with the height being one
> pixel larger than the actual size of the cursor. But this seems to fix
> things, and the code before was definitely incorrect - so it's not really
> worth looking into further imho.
>
> Changes since v1:
> * Don't use crtc_w everywhere for determining cursor layout, just use fb
>   size again
> * Change check so that we only check that the w/h of the cursor plane is
>   the same, the width of the scanout surface is the same as the framebuffer
>   width, and that there's no offset being used for the cursor surface.
>
> Signed-off-by: Lyude Paul <lyude@redhat.com>
> Cc: Martin Peres <martin.peres@mupuf.org>
> Cc: Jeremy Cline <jcline@redhat.com>
Thanks Lyude!

> ---
>  drivers/gpu/drm/nouveau/dispnv50/curs507a.c | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/nouveau/dispnv50/curs507a.c b/drivers/gpu/drm/nouveau/dispnv50/curs507a.c
> index 54fbd6fe751d..00e19fd959ea 100644
> --- a/drivers/gpu/drm/nouveau/dispnv50/curs507a.c
> +++ b/drivers/gpu/drm/nouveau/dispnv50/curs507a.c
> @@ -98,6 +98,7 @@ static int
>  curs507a_acquire(struct nv50_wndw *wndw, struct nv50_wndw_atom *asyw,
>                  struct nv50_head_atom *asyh)
>  {
> +       struct nouveau_drm *drm = nouveau_drm(wndw->plane.dev);
>         struct nv50_head *head = nv50_head(asyw->state.crtc);
>         int ret;
>
> @@ -109,8 +110,20 @@ curs507a_acquire(struct nv50_wndw *wndw, struct nv50_wndw_atom *asyw,
>         if (ret || !asyh->curs.visible)
>                 return ret;
>
> -       if (asyw->image.w != asyw->image.h)
> +       if (asyw->state.crtc_w != asyw->state.crtc_h) {
> +               NV_ATOMIC(drm, "Plane width/height must be equal for cursors\n");
>                 return -EINVAL;
> +       }
> +
> +       if (asyw->image.w != asyw->state.crtc_w) {
> +               NV_ATOMIC(drm, "Plane width must be equal to fb width for cursors (height can be larger though)\n");
> +               return -EINVAL;
> +       }
> +
> +       if (asyw->state.src_x || asyw->state.src_y) {
> +               NV_ATOMIC(drm, "Cursor planes do not support framebuffer offsets\n");
> +               return -EINVAL;
> +       }
>
>         ret = head->func->curs_layout(head, asyw, asyh);
>         if (ret)
> --
> 2.29.2
>
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