linux-kernel - Re: [PATCH v9 11/32] drm: mediatek: use common helper for extracting pages array

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Date:   Tue, 1 Sep 2020 19:54:55 +0100
From:   Robin Murphy <robin.murphy@....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>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        linux-arm-kernel@...ts.infradead.org,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v9 11/32] drm: mediatek: use common helper for extracting
 pages array

On 2020-08-26 07:32, Marek Szyprowski wrote:
> Use common helper for converting a sg_table object into struct
> page pointer array.

Reviewed-by: Robin Murphy <robin.murphy@....com>

Side note: is mtk_drm_gem_prime_vmap() missing a call to 
sg_free_table(sgt) before its kfree(sgt)?

> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> ---
>   drivers/gpu/drm/mediatek/mtk_drm_gem.c | 9 ++-------
>   1 file changed, 2 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.c b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> index 3654ec732029..0583e557ad37 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> @@ -233,9 +233,7 @@ void *mtk_drm_gem_prime_vmap(struct drm_gem_object *obj)
>   {
>   	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
>   	struct sg_table *sgt;
> -	struct sg_page_iter iter;
>   	unsigned int npages;
> -	unsigned int i = 0;
>   
>   	if (mtk_gem->kvaddr)
>   		return mtk_gem->kvaddr;
> @@ -249,11 +247,8 @@ void *mtk_drm_gem_prime_vmap(struct drm_gem_object *obj)
>   	if (!mtk_gem->pages)
>   		goto out;
>   
> -	for_each_sg_page(sgt->sgl, &iter, sgt->orig_nents, 0) {
> -		mtk_gem->pages[i++] = sg_page_iter_page(&iter);
> -		if (i > npages)
> -			break;
> -	}
> +	drm_prime_sg_to_page_addr_arrays(sgt, mtk_gem->pages, NULL, npages);
> +
>   	mtk_gem->kvaddr = vmap(mtk_gem->pages, npages, VM_MAP,
>   			       pgprot_writecombine(PAGE_KERNEL));
>   
>