[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Thu, 08 Aug 2013 15:44:09 +0200
From: Tomasz Figa <t.figa@...sung.com>
To: Cho KyongHo <pullip.cho@...sung.com>
Cc: 'Linux ARM Kernel' <linux-arm-kernel@...ts.infradead.org>,
'Linux IOMMU' <iommu@...ts.linux-foundation.org>,
'Linux Kernel' <linux-kernel@...r.kernel.org>,
'Linux Samsung SOC' <linux-samsung-soc@...r.kernel.org>,
devicetree@...r.kernel.org, 'Joerg Roedel' <joro@...tes.org>,
'Kukjin Kim' <kgene.kim@...sung.com>,
'Prathyush' <prathyush.k@...sung.com>,
'Rahul Sharma' <rahul.sharma@...sung.com>,
'Subash Patel' <supash.ramaswamy@...aro.org>,
'Grant Grundler' <grundler@...omium.org>,
'Antonios Motakis' <a.motakis@...tualopensystems.com>,
kvmarm@...ts.cs.columbia.edu,
'Sachin Kamat' <sachin.kamat@...aro.org>
Subject: Re: [PATCH v9 02/16] iommu/exynos: add missing cache flush for removed
page table entries
On Thursday 08 of August 2013 18:37:34 Cho KyongHo wrote:
> This commit adds cache flush for removed small and large page entries
> in exynos_iommu_unmap(). Missing cache flush of removed page table
> entries can cause missing page fault interrupt when a master IP
> accesses an unmapped area.
>
> Tested-by: Grant Grundler <grundler@...omium.org>
> Signed-off-by: Cho KyongHo <pullip.cho@...sung.com>
> ---
> drivers/iommu/exynos-iommu.c | 2 ++
> 1 files changed, 2 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
> index 233f382..d545a25 100644
> --- a/drivers/iommu/exynos-iommu.c
> +++ b/drivers/iommu/exynos-iommu.c
> @@ -1002,6 +1002,7 @@ static size_t exynos_iommu_unmap(struct
> iommu_domain *domain, if (lv2ent_small(ent)) {
> *ent = 0;
> size = SPAGE_SIZE;
> + pgtable_flush(ent, ent + 1);
> priv->lv2entcnt[lv1ent_offset(iova)] += 1;
> goto done;
> }
> @@ -1010,6 +1011,7 @@ static size_t exynos_iommu_unmap(struct
> iommu_domain *domain, BUG_ON(size < LPAGE_SIZE);
>
> memset(ent, 0, sizeof(*ent) * SPAGES_PER_LPAGE);
> + pgtable_flush(ent, ent + SPAGES_PER_LPAGE);
>
> size = LPAGE_SIZE;
> priv->lv2entcnt[lv1ent_offset(iova)] += SPAGES_PER_LPAGE;
Looks reasonable.
Reviewed-by: Tomasz Figa <t.figa@...sung.com>
Best regards,
Tomasz
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists