linux-kernel - Re: [PATCH] amdgpu: use dma-resv API instead of manual kmalloc

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Date:   Sat, 25 Jan 2020 12:52:23 +0100
From:   Stephen Kitt <steve@....org>
To:     Felix Kuehling <Felix.Kuehling@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Zhou <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Sumit Semwal <sumit.semwal@...aro.org>
Cc:     amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        steve@....org
Subject: Re: [PATCH] amdgpu: use dma-resv API instead of manual kmalloc

And of course I forgot this is an internal API, so this doesn't work 
without some of other stuff which isn't ready.

Please ignore...

Regards,

Stephen


Le 25/01/2020 12:46, Stephen Kitt a écrit :
> Instead of hand-coding the dma_resv_list allocation, use
> dma_resv_list_alloc, which masks the shared_max handling. While we're
> at it, since we only need shared_count fences, allocate shared_count
> fences rather than shared_max.
> 
> (This is the only place in the kernel, outside of dma-resv.c, which
> touches shared_max. This suggests we'd probably be better off without
> it!)
> 
> Signed-off-by: Stephen Kitt <steve@....org>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> index 888209eb8cec..aec595752200 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> @@ -234,12 +234,11 @@ static int
> amdgpu_amdkfd_remove_eviction_fence(struct amdgpu_bo *bo,
>  	if (!old)
>  		return 0;
> 
> -	new = kmalloc(offsetof(typeof(*new), shared[old->shared_max]),
> -		      GFP_KERNEL);
> +	new = dma_resv_list_alloc(old->shared_count);
>  	if (!new)
>  		return -ENOMEM;
> 
> -	/* Go through all the shared fences in the resevation object and sort
> +	/* Go through all the shared fences in the reservation object and 
> sort
>  	 * the interesting ones to the end of the list.
>  	 */
>  	for (i = 0, j = old->shared_count, k = 0; i < old->shared_count; ++i) 
> {
> @@ -253,7 +252,6 @@ static int
> amdgpu_amdkfd_remove_eviction_fence(struct amdgpu_bo *bo,
>  		else
>  			RCU_INIT_POINTER(new->shared[k++], f);
>  	}
> -	new->shared_max = old->shared_max;
>  	new->shared_count = k;
> 
>  	/* Install the new fence list, seqcount provides the barriers */