linux-kernel - Re: [RFC][PATCH 2/3] drm: vgem: Enable SYNCOBJ and SYNCOBJ

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Date:   Tue, 12 Jul 2022 09:45:55 +0200
From:   Christian König <christian.koenig@....com>
To:     John Stultz <jstultz@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Jason Ekstrand <jason@...kstrand.net>,
        Lionel Landwerlin <lionel.g.landwerlin@...el.com>,
        Chunming Zhou <david1.zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [RFC][PATCH 2/3] drm: vgem: Enable SYNCOBJ and SYNCOBJ_TIMELINE
 on vgem driver

Am 12.07.22 um 06:22 schrieb John Stultz:
> Allows for basic SYNCOBJ api testing, in environments
> like VMs where there may not be a supported drm driver.
>
> Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
> Cc: Maxime Ripard <mripard@...nel.org>
> Cc: Thomas Zimmermann <tzimmermann@...e.de>
> Cc: Jason Ekstrand <jason@...kstrand.net>
> Cc: Christian König <christian.koenig@....com>
> Cc: Lionel Landwerlin <lionel.g.landwerlin@...el.com>
> Cc: Chunming Zhou <david1.zhou@....com>
> Cc: David Airlie <airlied@...ux.ie>
> Cc: Daniel Vetter <daniel@...ll.ch>
> Cc: dri-devel@...ts.freedesktop.org
> Signed-off-by: John Stultz <jstultz@...gle.com>
> ---
>   drivers/gpu/drm/vgem/vgem_drv.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/vgem/vgem_drv.c b/drivers/gpu/drm/vgem/vgem_drv.c
> index c5e3e5457737..e5427d7399da 100644
> --- a/drivers/gpu/drm/vgem/vgem_drv.c
> +++ b/drivers/gpu/drm/vgem/vgem_drv.c
> @@ -109,7 +109,8 @@ static struct drm_gem_object *vgem_gem_create_object(struct drm_device *dev, siz
>   }
>   
>   static const struct drm_driver vgem_driver = {
> -	.driver_features		= DRIVER_GEM | DRIVER_RENDER,
> +	.driver_features		= DRIVER_GEM | DRIVER_RENDER |
> +					  DRIVER_SYNCOBJ | DRIVER_SYNCOBJ_TIMELINE,

Well that's rather surprising. I'm not an export on VGEM, but AFAIK you 
need to adjust the CS interface to support that stuff as well.

Christian.

>   	.open				= vgem_open,
>   	.postclose			= vgem_postclose,
>   	.ioctls				= vgem_ioctls,