linux-kernel - Re: [PATCH v7 07/36] drm: exynos: use common helper for a scatterlist contiguity check

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Date:   Tue, 14 Jul 2020 09:28:04 +0900
From:   Inki Dae <inki.dae@...sung.com>
To:     Marek Szyprowski <m.szyprowski@...sung.com>,
        dri-devel@...ts.freedesktop.org, iommu@...ts.linux-foundation.org,
        linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org
Cc:     Christoph Hellwig <hch@....de>,
        Robin Murphy <robin.murphy@....com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        linux-arm-kernel@...ts.infradead.org,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH v7 07/36] drm: exynos: use common helper for a
 scatterlist contiguity check



20. 6. 19. 오후 7:36에 Marek Szyprowski 이(가) 쓴 글:
> Use common helper for checking the contiguity of the imported dma-buf.
> 
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>

Acked-by : Inki Dae <inki.dae@...sung.com>

Thanks,
Inki Dae

> ---
>  drivers/gpu/drm/exynos/exynos_drm_gem.c | 23 +++--------------------
>  1 file changed, 3 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c
> index efa476858db5..1716a023bca0 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
> @@ -431,27 +431,10 @@ exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
>  {
>  	struct exynos_drm_gem *exynos_gem;
>  
> -	if (sgt->nents < 1)
> +	/* check if the entries in the sg_table are contiguous */
> +	if (drm_prime_get_contiguous_size(sgt) < attach->dmabuf->size) {
> +		DRM_ERROR("buffer chunks must be mapped contiguously");
>  		return ERR_PTR(-EINVAL);
> -
> -	/*
> -	 * Check if the provided buffer has been mapped as contiguous
> -	 * into DMA address space.
> -	 */
> -	if (sgt->nents > 1) {
> -		dma_addr_t next_addr = sg_dma_address(sgt->sgl);
> -		struct scatterlist *s;
> -		unsigned int i;
> -
> -		for_each_sg(sgt->sgl, s, sgt->nents, i) {
> -			if (!sg_dma_len(s))
> -				break;
> -			if (sg_dma_address(s) != next_addr) {
> -				DRM_ERROR("buffer chunks must be mapped contiguously");
> -				return ERR_PTR(-EINVAL);
> -			}
> -			next_addr = sg_dma_address(s) + sg_dma_len(s);
> -		}
>  	}
>  
>  	exynos_gem = exynos_drm_gem_init(dev, attach->dmabuf->size);
>