[PATCH v2 1/3] drm/etnaviv: skip command stream validation on PPAS capable GPUs

[Guido Günther]

Hi,
On Fri, Aug 09, 2019 at 02:05:12PM +0200, Lucas Stach wrote:
> With per-process address spaces in place, a rogue process submitting
> bogus command streams can only hurt itself. There is no need to
> validate the command stream before execution anymore.
> 
> Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
> Reviewed-by: Philipp Zabel <p.zabel at pengutronix.de>

Reviewed-by: Guido Günther <agx at sigxcpu.org> 

> ---
>  drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
> index 16e7d371a7ef..63a1206492d2 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
> @@ -517,7 +517,8 @@ int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data,
>  	if (ret)
>  		goto err_submit_objects;
>  
> -	if (!etnaviv_cmd_validate_one(gpu, stream, args->stream_size / 4,
> +	if ((priv->mmu_global->version != ETNAVIV_IOMMU_V2) &&
> +	    !etnaviv_cmd_validate_one(gpu, stream, args->stream_size / 4,
>  				      relocs, args->nr_relocs)) {
>  		ret = -EINVAL;
>  		goto err_submit_objects;
> -- 
> 2.20.1
> 
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