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Date: Mon, 18 Sep 2017 00:40:31 +0000 From: "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com> To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "stable@...r.kernel.org" <stable@...r.kernel.org> Cc: Marek Szyprowski <m.szyprowski@...sung.com>, Joerg Roedel <jroedel@...e.de>, "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com> Subject: [PATCH for 4.9 18/39] iommu/exynos: Block SYSMMU while invalidating FLPD cache From: Marek Szyprowski <m.szyprowski@...sung.com> [ Upstream commit 7d2aa6b814476a2e2794960f844344519246df72 ] Documentation specifies that SYSMMU should be in blocked state while performing TLB/FLPD cache invalidation, so add needed calls to sysmmu_block/unblock. Fixes: 66a7ed84b345d ("iommu/exynos: Apply workaround of caching fault page table entries") Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com> Signed-off-by: Joerg Roedel <jroedel@...e.de> Signed-off-by: Sasha Levin <alexander.levin@...izon.com> --- drivers/iommu/exynos-iommu.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index 30808e91b775..c7820b3ea80e 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -542,7 +542,10 @@ static void sysmmu_tlb_invalidate_flpdcache(struct sysmmu_drvdata *data, spin_lock_irqsave(&data->lock, flags); if (is_sysmmu_active(data) && data->version >= MAKE_MMU_VER(3, 3)) { clk_enable(data->clk_master); - __sysmmu_tlb_invalidate_entry(data, iova, 1); + if (sysmmu_block(data)) { + __sysmmu_tlb_invalidate_entry(data, iova, 1); + sysmmu_unblock(data); + } clk_disable(data->clk_master); } spin_unlock_irqrestore(&data->lock, flags); -- 2.11.0
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