linux-kernel - Re: [PATCH] Revert "drm/qxl: drop prime import/export callbacks"

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Message-ID: <CAKMK7uG+vMU0hqqiKAswu=LqpkcXtLPqbYLRWgoAPpsQQV4qzA@mail.gmail.com>
Date:   Fri, 26 Apr 2019 16:21:37 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Gerd Hoffmann <kraxel@...hat.com>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        David Airlie <airlied@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        "open list:DRM DRIVER FOR QXL VIRTUAL GPU" 
        <virtualization@...ts.linux-foundation.org>,
        "open list:DRM DRIVER FOR QXL VIRTUAL GPU" 
        <spice-devel@...ts.freedesktop.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Revert "drm/qxl: drop prime import/export callbacks"

On Fri, Apr 26, 2019 at 7:33 AM Gerd Hoffmann <kraxel@...hat.com> wrote:
>
> This reverts commit f4c34b1e2a37d5676180901fa6ff188bcb6371f8.
>
> Simliar to commit a0cecc23cfcb Revert "drm/virtio: drop prime
> import/export callbacks".  We have to do the same with qxl,
> for the same reasons (it breaks DRI3).
>
> Drop the WARN_ON_ONCE().
>
> Fixes: f4c34b1e2a37d5676180901fa6ff188bcb6371f8
> Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>

Maybe we need some helpers for virtual drivers which only allow
self-reimport and nothing else at all? I think there's qxl, virgl,
vmwgfx and maybe also vbox one who could use this ... Just a quick
idea.
-Daniel

> ---
>  drivers/gpu/drm/qxl/qxl_drv.c   |  4 ++++
>  drivers/gpu/drm/qxl/qxl_prime.c | 12 ++++++++++++
>  2 files changed, 16 insertions(+)
>
> diff --git a/drivers/gpu/drm/qxl/qxl_drv.c b/drivers/gpu/drm/qxl/qxl_drv.c
> index 578d867a81d5..f33e349c4ec5 100644
> --- a/drivers/gpu/drm/qxl/qxl_drv.c
> +++ b/drivers/gpu/drm/qxl/qxl_drv.c
> @@ -255,10 +255,14 @@ static struct drm_driver qxl_driver = {
>  #if defined(CONFIG_DEBUG_FS)
>         .debugfs_init = qxl_debugfs_init,
>  #endif
> +       .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
> +       .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
>         .gem_prime_export = drm_gem_prime_export,
>         .gem_prime_import = drm_gem_prime_import,
>         .gem_prime_pin = qxl_gem_prime_pin,
>         .gem_prime_unpin = qxl_gem_prime_unpin,
> +       .gem_prime_get_sg_table = qxl_gem_prime_get_sg_table,
> +       .gem_prime_import_sg_table = qxl_gem_prime_import_sg_table,
>         .gem_prime_vmap = qxl_gem_prime_vmap,
>         .gem_prime_vunmap = qxl_gem_prime_vunmap,
>         .gem_prime_mmap = qxl_gem_prime_mmap,
> diff --git a/drivers/gpu/drm/qxl/qxl_prime.c b/drivers/gpu/drm/qxl/qxl_prime.c
> index 8b448eca1cd9..114653b471c6 100644
> --- a/drivers/gpu/drm/qxl/qxl_prime.c
> +++ b/drivers/gpu/drm/qxl/qxl_prime.c
> @@ -42,6 +42,18 @@ void qxl_gem_prime_unpin(struct drm_gem_object *obj)
>         qxl_bo_unpin(bo);
>  }
>
> +struct sg_table *qxl_gem_prime_get_sg_table(struct drm_gem_object *obj)
> +{
> +       return ERR_PTR(-ENOSYS);
> +}
> +
> +struct drm_gem_object *qxl_gem_prime_import_sg_table(
> +       struct drm_device *dev, struct dma_buf_attachment *attach,
> +       struct sg_table *table)
> +{
> +       return ERR_PTR(-ENOSYS);
> +}
> +
>  void *qxl_gem_prime_vmap(struct drm_gem_object *obj)
>  {
>         struct qxl_bo *bo = gem_to_qxl_bo(obj);
> --
> 2.18.1
>


-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch