linux-kernel - [PATCH 5.1 071/122] iommu/tegra-smmu: Fix invalid ASID bits on Tegra30/114

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Date:   Thu, 23 May 2019 21:06:33 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dmitry Osipenko <digetx@...il.com>,
        Thierry Reding <treding@...dia.com>,
        Joerg Roedel <jroedel@...e.de>
Subject: [PATCH 5.1 071/122] iommu/tegra-smmu: Fix invalid ASID bits on Tegra30/114

From: Dmitry Osipenko <digetx@...il.com>

commit 43a0541e312f7136e081e6bf58f6c8a2e9672688 upstream.

Both Tegra30 and Tegra114 have 4 ASID's and the corresponding bitfield of
the TLB_FLUSH register differs from later Tegra generations that have 128
ASID's.

In a result the PTE's are now flushed correctly from TLB and this fixes
problems with graphics (randomly failing tests) on Tegra30.

Cc: stable <stable@...r.kernel.org>
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
Acked-by: Thierry Reding <treding@...dia.com>
Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/iommu/tegra-smmu.c |   25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -102,7 +102,6 @@ static inline u32 smmu_readl(struct tegr
 #define  SMMU_TLB_FLUSH_VA_MATCH_ALL     (0 << 0)
 #define  SMMU_TLB_FLUSH_VA_MATCH_SECTION (2 << 0)
 #define  SMMU_TLB_FLUSH_VA_MATCH_GROUP   (3 << 0)
-#define  SMMU_TLB_FLUSH_ASID(x)          (((x) & 0x7f) << 24)
 #define  SMMU_TLB_FLUSH_VA_SECTION(addr) ((((addr) & 0xffc00000) >> 12) | \
 					  SMMU_TLB_FLUSH_VA_MATCH_SECTION)
 #define  SMMU_TLB_FLUSH_VA_GROUP(addr)   ((((addr) & 0xffffc000) >> 12) | \
@@ -205,8 +204,12 @@ static inline void smmu_flush_tlb_asid(s
 {
 	u32 value;
 
-	value = SMMU_TLB_FLUSH_ASID_MATCH | SMMU_TLB_FLUSH_ASID(asid) |
-		SMMU_TLB_FLUSH_VA_MATCH_ALL;
+	if (smmu->soc->num_asids == 4)
+		value = (asid & 0x3) << 29;
+	else
+		value = (asid & 0x7f) << 24;
+
+	value |= SMMU_TLB_FLUSH_ASID_MATCH | SMMU_TLB_FLUSH_VA_MATCH_ALL;
 	smmu_writel(smmu, value, SMMU_TLB_FLUSH);
 }
 
@@ -216,8 +219,12 @@ static inline void smmu_flush_tlb_sectio
 {
 	u32 value;
 
-	value = SMMU_TLB_FLUSH_ASID_MATCH | SMMU_TLB_FLUSH_ASID(asid) |
-		SMMU_TLB_FLUSH_VA_SECTION(iova);
+	if (smmu->soc->num_asids == 4)
+		value = (asid & 0x3) << 29;
+	else
+		value = (asid & 0x7f) << 24;
+
+	value |= SMMU_TLB_FLUSH_ASID_MATCH | SMMU_TLB_FLUSH_VA_SECTION(iova);
 	smmu_writel(smmu, value, SMMU_TLB_FLUSH);
 }
 
@@ -227,8 +234,12 @@ static inline void smmu_flush_tlb_group(
 {
 	u32 value;
 
-	value = SMMU_TLB_FLUSH_ASID_MATCH | SMMU_TLB_FLUSH_ASID(asid) |
-		SMMU_TLB_FLUSH_VA_GROUP(iova);
+	if (smmu->soc->num_asids == 4)
+		value = (asid & 0x3) << 29;
+	else
+		value = (asid & 0x7f) << 24;
+
+	value |= SMMU_TLB_FLUSH_ASID_MATCH | SMMU_TLB_FLUSH_VA_GROUP(iova);
 	smmu_writel(smmu, value, SMMU_TLB_FLUSH);
 }