This is a note to let you know that I've just added the patch titled
iommu/exynos: Workaround FLPD cache flush issues for SYSMMU v5
to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: iommu-exynos-workaround-flpd-cache-flush-issues-for-sysmmu-v5.patch and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Thu Dec 21 09:02:40 CET 2017
From: Marek Szyprowski m.szyprowski@samsung.com Date: Mon, 20 Mar 2017 10:17:57 +0100 Subject: iommu/exynos: Workaround FLPD cache flush issues for SYSMMU v5
From: Marek Szyprowski m.szyprowski@samsung.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@vger.kernel.org # v4.10+ Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com Tested-by: Andrzej Hajda a.hajda@samsung.com Signed-off-by: Joerg Roedel jroedel@suse.de Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.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);
Patches currently in stable-queue which might be from m.szyprowski@samsung.com are
queue-4.9/iommu-exynos-workaround-flpd-cache-flush-issues-for-sysmmu-v5.patch