linux-kernel - Re: [PATCH] v3d: fixup for submit alignment and check for zero flags in other ioctls.

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Date:   Wed, 2 May 2018 09:44:17 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Eric Anholt <eric@...olt.net>
Cc:     dri-devel@...ts.freedesktop.org,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Dave Airlie <airlied@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] v3d: fixup for submit alignment and check for zero flags
 in other ioctls.

On Tue, May 01, 2018 at 10:58:45AM -0700, Eric Anholt wrote:
> Signed-off-by: Eric Anholt <eric@...olt.net>
> ---
> 
> airlied + danvet: this is the last change I think we need before I can
> merge v3d with your acks.  Sending as a diff so you don't have to look
> at the whole thing again.  Look good?

Hm I thought I've checked all your ioctl and made sure you're checking for
0 everywhere ... I guess I was blind. Anyway, lgtm, ack still holds.
-Daniel

> 
>  drivers/gpu/drm/v3d/v3d_bo.c  | 10 ++++++++++
>  drivers/gpu/drm/v3d/v3d_gem.c |  5 +++++
>  include/uapi/drm/v3d_drm.h    |  3 +++
>  3 files changed, 18 insertions(+)
> 
> diff --git a/drivers/gpu/drm/v3d/v3d_bo.c b/drivers/gpu/drm/v3d/v3d_bo.c
> index 2be4e8b71604..7b1e2a549a71 100644
> --- a/drivers/gpu/drm/v3d/v3d_bo.c
> +++ b/drivers/gpu/drm/v3d/v3d_bo.c
> @@ -325,6 +325,11 @@ int v3d_create_bo_ioctl(struct drm_device *dev, void *data,
>  	struct v3d_bo *bo = NULL;
>  	int ret;
>  
> +	if (args->flags != 0) {
> +		DRM_INFO("unknown create_bo flags: %d\n", args->flags);
> +		return -EINVAL;
> +	}
> +
>  	bo = v3d_bo_create(dev, file_priv, PAGE_ALIGN(args->size));
>  	if (IS_ERR(bo))
>  		return PTR_ERR(bo);
> @@ -344,6 +349,11 @@ int v3d_mmap_bo_ioctl(struct drm_device *dev, void *data,
>  	struct drm_gem_object *gem_obj;
>  	int ret;
>  
> +	if (args->flags != 0) {
> +		DRM_INFO("unknown mmap_bo flags: %d\n", args->flags);
> +		return -EINVAL;
> +	}
> +
>  	gem_obj = drm_gem_object_lookup(file_priv, args->handle);
>  	if (!gem_obj) {
>  		DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle);
> diff --git a/drivers/gpu/drm/v3d/v3d_gem.c b/drivers/gpu/drm/v3d/v3d_gem.c
> index fa39a1e35263..b513f9189caf 100644
> --- a/drivers/gpu/drm/v3d/v3d_gem.c
> +++ b/drivers/gpu/drm/v3d/v3d_gem.c
> @@ -503,6 +503,11 @@ v3d_submit_cl_ioctl(struct drm_device *dev, void *data,
>  	struct drm_syncobj *sync_out;
>  	int ret = 0;
>  
> +	if (args->pad != 0) {
> +		DRM_INFO("pad must be zero: %d\n", args->pad);
> +		return -EINVAL;
> +	}
> +
>  	exec = kcalloc(1, sizeof(*exec), GFP_KERNEL);
>  	if (!exec)
>  		return -ENOMEM;
> diff --git a/include/uapi/drm/v3d_drm.h b/include/uapi/drm/v3d_drm.h
> index 201a07645bdd..7b6627783608 100644
> --- a/include/uapi/drm/v3d_drm.h
> +++ b/include/uapi/drm/v3d_drm.h
> @@ -101,6 +101,9 @@ struct drm_v3d_submit_cl {
>  
>  	/* Number of BO handles passed in (size is that times 4). */
>  	__u32 bo_handle_count;
> +
> +	/* Pad, must be zero-filled. */
> +	__u32 pad;
>  };
>  
>  /**
> -- 
> 2.17.0
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch