linux-kernel - [PATCH 4.9 026/104] iommu/exynos: Workaround FLPD cache flush issues for SYSMMU v5

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Message-Id: <20171222084611.611348105@linuxfoundation.org>
Date:   Fri, 22 Dec 2017 09:45:52 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Joerg Roedel <jroedel@...e.de>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.9 026/104] iommu/exynos: Workaround FLPD cache flush issues for SYSMMU v5

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Marek Szyprowski <m.szyprowski@...sung.com>


[ Upstream commit cd37a296a9f890586665bb8974a8b17ee2f17d6d ]

For some unknown reasons, in some cases, FLPD cache invalidation doesn't
work properly with SYSMMU v5 controllers found in Exynos5433 SoCs. This
can be observed by a firmware crash during initialization phase of MFC
video decoder available in the mentioned SoCs when IOMMU support is
enabled. To workaround this issue perform a full TLB/FLPD invalidation
in case of replacing any first level page descriptors in case of SYSMMU v5.

Fixes: 740a01eee9ada ("iommu/exynos: Add support for v5 SYSMMU")
CC: stable@...r.kernel.org # v4.10+
Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
Tested-by: Andrzej Hajda <a.hajda@...sung.com>
Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/iommu/exynos-iommu.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -543,7 +543,10 @@ static void sysmmu_tlb_invalidate_flpdca
 	if (is_sysmmu_active(data) && data->version >= MAKE_MMU_VER(3, 3)) {
 		clk_enable(data->clk_master);
 		if (sysmmu_block(data)) {
-			__sysmmu_tlb_invalidate_entry(data, iova, 1);
+			if (data->version >= MAKE_MMU_VER(5, 0))
+				__sysmmu_tlb_invalidate(data);
+			else
+				__sysmmu_tlb_invalidate_entry(data, iova, 1);
 			sysmmu_unblock(data);
 		}
 		clk_disable(data->clk_master);