linux-kernel - Re: [PATCH v4 05/10] iommu/exynos: use page allocation function provided by iommu-pages.h

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Date: Fri, 9 Feb 2024 12:26:08 +0100
From: Marek Szyprowski <m.szyprowski@...sung.com>
To: Pasha Tatashin <pasha.tatashin@...een.com>, akpm@...ux-foundation.org,
	alim.akhtar@...sung.com, alyssa@...enzweig.io, asahi@...ts.linux.dev,
	baolu.lu@...ux.intel.com, bhelgaas@...gle.com, cgroups@...r.kernel.org,
	corbet@....net, david@...hat.com, dwmw2@...radead.org, hannes@...xchg.org,
	heiko@...ech.de, iommu@...ts.linux.dev, jernej.skrabec@...il.com,
	jonathanh@...dia.com, joro@...tes.org, krzysztof.kozlowski@...aro.org,
	linux-doc@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-rockchip@...ts.infradead.org, linux-samsung-soc@...r.kernel.org,
	linux-sunxi@...ts.linux.dev, linux-tegra@...r.kernel.org,
	lizefan.x@...edance.com, marcan@...can.st, mhiramat@...nel.org,
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	samuel@...lland.org, suravee.suthikulpanit@....com, sven@...npeter.dev,
	thierry.reding@...il.com, tj@...nel.org, tomas.mudrunka@...il.com,
	vdumpa@...dia.com, wens@...e.org, will@...nel.org, yu-cheng.yu@...el.com,
	rientjes@...gle.com, bagasdotme@...il.com, mkoutny@...e.com
Subject: Re: [PATCH v4 05/10] iommu/exynos: use page allocation function
 provided by iommu-pages.h

On 07.02.2024 18:40, Pasha Tatashin wrote:
> Convert iommu/exynos-iommu.c to use the new page allocation functions
> provided in iommu-pages.h.
>
> Signed-off-by: Pasha Tatashin <pasha.tatashin@...een.com>
> Acked-by: David Rientjes <rientjes@...gle.com>
> Tested-by: Bagas Sanjaya <bagasdotme@...il.com>
Acked-by: Marek Szyprowski <m.szyprowski@...sung.com>
> ---
>   drivers/iommu/exynos-iommu.c | 14 ++++++++------
>   1 file changed, 8 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
> index 2c6e9094f1e9..3eab0ae65a4f 100644
> --- a/drivers/iommu/exynos-iommu.c
> +++ b/drivers/iommu/exynos-iommu.c
> @@ -22,6 +22,8 @@
>   #include <linux/pm_runtime.h>
>   #include <linux/slab.h>
>   
> +#include "iommu-pages.h"
> +
>   typedef u32 sysmmu_iova_t;
>   typedef u32 sysmmu_pte_t;
>   static struct iommu_domain exynos_identity_domain;
> @@ -900,11 +902,11 @@ static struct iommu_domain *exynos_iommu_domain_alloc_paging(struct device *dev)
>   	if (!domain)
>   		return NULL;
>   
> -	domain->pgtable = (sysmmu_pte_t *)__get_free_pages(GFP_KERNEL, 2);
> +	domain->pgtable = iommu_alloc_pages(GFP_KERNEL, 2);
>   	if (!domain->pgtable)
>   		goto err_pgtable;
>   
> -	domain->lv2entcnt = (short *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 1);
> +	domain->lv2entcnt = iommu_alloc_pages(GFP_KERNEL, 1);
>   	if (!domain->lv2entcnt)
>   		goto err_counter;
>   
> @@ -930,9 +932,9 @@ static struct iommu_domain *exynos_iommu_domain_alloc_paging(struct device *dev)
>   	return &domain->domain;
>   
>   err_lv2ent:
> -	free_pages((unsigned long)domain->lv2entcnt, 1);
> +	iommu_free_pages(domain->lv2entcnt, 1);
>   err_counter:
> -	free_pages((unsigned long)domain->pgtable, 2);
> +	iommu_free_pages(domain->pgtable, 2);
>   err_pgtable:
>   	kfree(domain);
>   	return NULL;
> @@ -973,8 +975,8 @@ static void exynos_iommu_domain_free(struct iommu_domain *iommu_domain)
>   					phys_to_virt(base));
>   		}
>   
> -	free_pages((unsigned long)domain->pgtable, 2);
> -	free_pages((unsigned long)domain->lv2entcnt, 1);
> +	iommu_free_pages(domain->pgtable, 2);
> +	iommu_free_pages(domain->lv2entcnt, 1);
>   	kfree(domain);
>   }
>   

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland