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Subject[PATCH for 4.9 18/39] iommu/exynos: Block SYSMMU while invalidating FLPD cache
Date
From: Marek Szyprowski <m.szyprowski@samsung.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@samsung.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <alexander.levin@verizon.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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