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Subject: Re: [PATCH v7 07/36] drm: exynos: use common helper for a
 scatterlist contiguity check
To:     Marek Szyprowski <m.szyprowski@samsung.com>,
        dri-devel@lists.freedesktop.org, iommu@lists.linux-foundation.org,
        linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org
Cc:     linux-samsung-soc@vger.kernel.org,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
        David Airlie <airlied@linux.ie>,
        Seung-Woo Kim <sw0312.kim@samsung.com>,
        Robin Murphy <robin.murphy@arm.com>,
        Christoph Hellwig <hch@lst.de>,
        linux-arm-kernel@lists.infradead.org
From:   Andrzej Hajda <a.hajda@samsung.com>
Message-ID: <8e25b060-2901-6d8d-f5ee-9f7cc0f02b77@samsung.com>
Date:   Tue, 7 Jul 2020 11:35:52 +0200
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References: <20200619103636.11974-1-m.szyprowski@samsung.com>
        <CGME20200619103657eucas1p24bff92408adbd4715130fb47595a6187@eucas1p2.samsung.com>
        <20200619103636.11974-8-m.szyprowski@samsung.com>
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Hi,

On 19.06.2020 12:36, Marek Szyprowski wrote:
> Use common helper for checking the contiguity of the imported dma-buf.
>
> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> ---
>   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);
> -		}
>   	}


Reviewed-by <a.hajda@samsung.com>


Regards
Andrzej
>   
>   	exynos_gem = exynos_drm_gem_init(dev, attach->dmabuf->size);