Patch "iommu/exynos: Workaround FLPD cache flush issues for SYSMMU v5" has been added to the 4.10-stable tree

Patch "iommu/exynos: Workaround FLPD cache flush issues for SYSMMU v5" has been added to the 4.10-stable tree

[gregkh]

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 4.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

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-4.10 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 cd37a296a9f890586665bb8974a8b17ee2f17d6d Mon Sep 17 00:00:00 2001
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>

commit cd37a296a9f890586665bb8974a8b17ee2f17d6d upstream.

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")
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: 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
@@ -510,7 +510,10 @@ static void sysmmu_tlb_invalidate_flpdca
 	if (data->active && 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-4.10/iommu-exynos-block-sysmmu-while-invalidating-flpd-cache.patch
queue-4.10/iommu-exynos-workaround-flpd-cache-flush-issues-for-sysmmu-v5.patch