Re: [Intel-gfx] [PATCH 14/28] drm/msm: use new iterator in msm_gem_describe

[Daniel Vetter <daniel@ffwll.ch>]

On Tue, Oct 05, 2021 at 01:37:28PM +0200, Christian König wrote:
> Simplifying the code a bit. Also drop the RCU read side lock since the
> object is locked anyway.
> 
> Untested since I can't get the driver to compile on !ARM.

Cross-compiler install is pretty easy and you should have that for pushing
drm changes to drm-misc :-)

> Signed-off-by: Christian König <christian.koenig@amd.com>

Assuming this compiles, it looks correct.

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

> ---
>  drivers/gpu/drm/msm/msm_gem.c | 19 +++++--------------
>  1 file changed, 5 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
> index 40a9863f5951..5bd511f07c07 100644
> --- a/drivers/gpu/drm/msm/msm_gem.c
> +++ b/drivers/gpu/drm/msm/msm_gem.c
> @@ -880,7 +880,7 @@ void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m,
>  {
>  	struct msm_gem_object *msm_obj = to_msm_bo(obj);
>  	struct dma_resv *robj = obj->resv;
> -	struct dma_resv_list *fobj;
> +	struct dma_resv_iter cursor;
>  	struct dma_fence *fence;
>  	struct msm_gem_vma *vma;
>  	uint64_t off = drm_vma_node_start(&obj->vma_node);
> @@ -955,22 +955,13 @@ void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m,
>  		seq_puts(m, "\n");
>  	}
>  
> -	rcu_read_lock();
> -	fobj = dma_resv_shared_list(robj);
> -	if (fobj) {
> -		unsigned int i, shared_count = fobj->shared_count;
> -
> -		for (i = 0; i < shared_count; i++) {
> -			fence = rcu_dereference(fobj->shared[i]);
> +	dma_resv_for_each_fence(&cursor, robj, true, fence) {
> +		if (dma_resv_iter_is_exclusive(&cursor))
> +			describe_fence(fence, "Exclusive", m);
> +		else
>  			describe_fence(fence, "Shared", m);
> -		}
>  	}
>  
> -	fence = dma_resv_excl_fence(robj);
> -	if (fence)
> -		describe_fence(fence, "Exclusive", m);
> -	rcu_read_unlock();
> -
>  	msm_gem_unlock(obj);
>  }
>  
> -- 
> 2.25.1
> 

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