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[PATCH for 4.9 18/39] iommu/exynos: Block SYSMMU while invalidating FLPD cache

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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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[PATCH for 4.9 18/39] iommu/exynos: Block SYSMMU while invalidating  FLPD cache "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-18 02:50 +0200
  [PATCH for 4.9 27/39] x86/acpi: Restore the order of CPU IDs "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-18 02:50 +0200
  [PATCH for 4.9 22/39] netfilter: nfnl_cthelper: fix incorrect  helper->expect_class_max "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-18 02:50 +0200
  [PATCH for 4.9 35/39] xfs: remove kmem_zalloc_greedy "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-18 02:50 +0200
  [PATCH for 4.9 31/39] rds: ib: add error handle "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-18 02:50 +0200
  [PATCH for 4.9 24/39] nfs: make nfs4_cb_sv_ops static "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-18 02:50 +0200
  [PATCH for 4.9 32/39] md/raid10: submit bio directly to replacement  disk "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-18 02:50 +0200
  [PATCH for 4.9 38/39] ARM: dts: BCM5301X: Fix memory start address "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-18 02:50 +0200
  [PATCH for 4.9 29/39] arm64: kasan: avoid bad virt_to_pfn() "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-18 02:50 +0200
  [PATCH for 4.9 39/39] tools/power turbostat: bugfix: GFXMHz column  not changing "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-18 02:50 +0200
  [PATCH for 4.9 20/39] MIPS: smp-cps: Fix retrieval of VPE mask on big  endian CPUs "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-18 02:50 +0200
  [PATCH for 4.9 28/39] iommu/io-pgtable-arm: Check for leaf entry  before dereferencing it "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-18 02:50 +0200
  [PATCH for 4.9 23/39] parisc: perf: Fix potential NULL pointer  dereference "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-18 02:50 +0200
  [PATCH for 4.9 34/39] i2c: meson: fix wrong variable usage in  meson_i2c_put_data "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-18 02:50 +0200
  [PATCH for 4.9 36/39] ASoC: wm_adsp: Return an error on write to a  disabled volatile control "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-18 02:50 +0200
  [PATCH for 4.9 25/39] ibmvnic: Free tx/rx scrq pointer array when  releasing sub-crqs "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-18 02:50 +0200
  [PATCH for 4.9 33/39] netfilter: nf_tables: set pktinfo->thoff at AH  header if found "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-18 02:50 +0200
  [PATCH for 4.9 37/39] libata: transport: Remove circular dependency  at free time "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-18 02:50 +0200

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