[PATCH v2 0/7] Cavium ThunderX2 SMMUv3 errata workarounds

[PATCH v2 0/7] Cavium ThunderX2 SMMUv3 errata workarounds

[Geetha sowjanya]

From: Linu Cherian <linu.cherian@cavium.com>

Cavium ThunderX2 SMMUv3 implementation has two Silicon Erratas.
1. Errata ID #74
   SMMU register alias Page 1 is not implemented
2. Errata ID #126
   SMMU doesnt support unique IRQ lines and also MSI for gerror, 
   eventq and cmdq-sync

The following patchset does software workaround for these two erratas.

This series is based on patchset. 
https://www.spinics.net/lists/arm-kernel/msg578443.html

Changes from v1:
 Since the use of MIDR register is rejected and SMMU_IIDR is broken on this 
 silicon, as suggested by Will Deacon modified the patches to use ThunderX2 
 SMMUv3 IORT model number to enable errata workaround.


Geetha Sowjanya (1):
  iommu/arm-smmu-v3: Add workaround for Cavium ThunderX2 erratum #126

Linu Cherian (6):
  iommu/arm-smmu-v3: Introduce smmu option PAGE0_REGS_ONLY for ThunderX2
    errata#74.
  iommu/arm-smmu-v3: Do resource size checks based on SMMU option
    PAGE0_REGS_ONLY
  ACPICA: IORT: Add Cavium ThunderX2 SMMUv3 model definition.
  iommu/arm-smmu-v3: For ACPI based device probing, set PAGE0_REGS_ONLY
    option     for ThunderX2 SMMUv3 implementations.
  ACPI/IORT: Fixup SMMUv3 resource size for Cavium ThunderX2 SMMUv3
    model
  arm64: Documentation: Add Cavium ThunderX2 SMMUv3 erratas

 Documentation/arm64/silicon-errata.txt |   2 +
 drivers/acpi/arm64/iort.c              |  10 ++-
 drivers/iommu/arm-smmu-v3.c            | 122 ++++++++++++++++++++++++++-------
 include/acpi/actbl2.h                  |   2 +
 4 files changed, 110 insertions(+), 26 deletions(-)

-- 
1.8.3.1

[PATCH v2 0/7] Cavium ThunderX2 SMMUv3 errata workarounds

[Geetha sowjanya]

From: Linu Cherian <linu.cherian@cavium.com>

Cavium ThunderX2 SMMUv3 implementation has two Silicon Erratas.
1. Errata ID #74
   SMMU register alias Page 1 is not implemented
2. Errata ID #126
   SMMU doesnt support unique IRQ lines and also MSI for gerror, 
   eventq and cmdq-sync

The following patchset does software workaround for these two erratas.

This series is based on patchset. 
https://www.spinics.net/lists/arm-kernel/msg578443.html

Changes from v1:
 Since the use of MIDR register is rejected and SMMU_IIDR is broken on this 
 silicon, as suggested by Will Deacon modified the patches to use ThunderX2 
 SMMUv3 IORT model number to enable errata workaround.


Geetha Sowjanya (1):
  iommu/arm-smmu-v3: Add workaround for Cavium ThunderX2 erratum #126

Linu Cherian (6):
  iommu/arm-smmu-v3: Introduce smmu option PAGE0_REGS_ONLY for ThunderX2
    errata#74.
  iommu/arm-smmu-v3: Do resource size checks based on SMMU option
    PAGE0_REGS_ONLY
  ACPICA: IORT: Add Cavium ThunderX2 SMMUv3 model definition.
  iommu/arm-smmu-v3: For ACPI based device probing, set PAGE0_REGS_ONLY
    option     for ThunderX2 SMMUv3 implementations.
  ACPI/IORT: Fixup SMMUv3 resource size for Cavium ThunderX2 SMMUv3
    model
  arm64: Documentation: Add Cavium ThunderX2 SMMUv3 erratas

 Documentation/arm64/silicon-errata.txt |   2 +
 drivers/acpi/arm64/iort.c              |  10 ++-
 drivers/iommu/arm-smmu-v3.c            | 122 ++++++++++++++++++++++++++-------
 include/acpi/actbl2.h                  |   2 +
 4 files changed, 110 insertions(+), 26 deletions(-)

-- 
1.8.3.1

[PATCH v2 1/7] iommu/arm-smmu-v3: Introduce SMMU option PAGE0_REGS_ONLY

[Geetha sowjanya]

From: Linu Cherian <linu.cherian@cavium.com>

Cavium ThunderX2 SMMU implementation doesn't support page 1 register space
and PAGE0_REGS_ONLY option will be enabled as an errata workaround.

This option when turned on, replaces all page 1 offsets used for
EVTQ_PROD/CONS, PRIQ_PROD/CONS register access with page 0 offsets.

Signed-off-by: Linu Cherian <linu.cherian@cavium.com>
Signed-off-by: Geetha Sowjanya <geethasowjanya.akula@cavium.com>
---
 drivers/iommu/arm-smmu-v3.c | 44 ++++++++++++++++++++++++++++++++------------
 1 file changed, 32 insertions(+), 12 deletions(-)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 380969a..107b4a6 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -176,15 +176,15 @@
 #define ARM_SMMU_CMDQ_CONS		0x9c
 
 #define ARM_SMMU_EVTQ_BASE		0xa0
-#define ARM_SMMU_EVTQ_PROD		0x100a8
-#define ARM_SMMU_EVTQ_CONS		0x100ac
+#define ARM_SMMU_EVTQ_PROD(smmu)	(page1_offset_adjust(0x100a8, smmu))
+#define ARM_SMMU_EVTQ_CONS(smmu)	(page1_offset_adjust(0x100ac, smmu))
 #define ARM_SMMU_EVTQ_IRQ_CFG0		0xb0
 #define ARM_SMMU_EVTQ_IRQ_CFG1		0xb8
 #define ARM_SMMU_EVTQ_IRQ_CFG2		0xbc
 
 #define ARM_SMMU_PRIQ_BASE		0xc0
-#define ARM_SMMU_PRIQ_PROD		0x100c8
-#define ARM_SMMU_PRIQ_CONS		0x100cc
+#define ARM_SMMU_PRIQ_PROD(smmu)	(page1_offset_adjust(0x100c8, smmu))
+#define ARM_SMMU_PRIQ_CONS(smmu)	(page1_offset_adjust(0x100cc, smmu))
 #define ARM_SMMU_PRIQ_IRQ_CFG0		0xd0
 #define ARM_SMMU_PRIQ_IRQ_CFG1		0xd8
 #define ARM_SMMU_PRIQ_IRQ_CFG2		0xdc
@@ -412,6 +412,9 @@
 #define MSI_IOVA_BASE			0x8000000
 #define MSI_IOVA_LENGTH			0x100000
 
+#define ARM_SMMU_PAGE0_REGS_ONLY(smmu)		\
+	((smmu)->options & ARM_SMMU_OPT_PAGE0_REGS_ONLY)
+
 static bool disable_bypass;
 module_param_named(disable_bypass, disable_bypass, bool, S_IRUGO);
 MODULE_PARM_DESC(disable_bypass,
@@ -597,6 +600,7 @@ struct arm_smmu_device {
 	u32				features;
 
 #define ARM_SMMU_OPT_SKIP_PREFETCH	(1 << 0)
+#define ARM_SMMU_OPT_PAGE0_REGS_ONLY    (1 << 1)
 	u32				options;
 
 	struct arm_smmu_cmdq		cmdq;
@@ -663,9 +667,19 @@ struct arm_smmu_option_prop {
 
 static struct arm_smmu_option_prop arm_smmu_options[] = {
 	{ ARM_SMMU_OPT_SKIP_PREFETCH, "hisilicon,broken-prefetch-cmd" },
+	{ ARM_SMMU_OPT_PAGE0_REGS_ONLY, "cavium-cn99xx,broken-page1-regspace"},
 	{ 0, NULL},
 };
 
+static inline unsigned long page1_offset_adjust(
+	unsigned long off, struct arm_smmu_device *smmu)
+{
+	if (!ARM_SMMU_PAGE0_REGS_ONLY(smmu))
+		return off;
+	else
+		return (off - SZ_64K);
+}
+
 static struct arm_smmu_domain *to_smmu_domain(struct iommu_domain *dom)
 {
 	return container_of(dom, struct arm_smmu_domain, domain);
@@ -1986,8 +2000,10 @@ static int arm_smmu_init_queues(struct arm_smmu_device *smmu)
 		return ret;
 
 	/* evtq */
-	ret = arm_smmu_init_one_queue(smmu, &smmu->evtq.q, ARM_SMMU_EVTQ_PROD,
-				      ARM_SMMU_EVTQ_CONS, EVTQ_ENT_DWORDS);
+	ret = arm_smmu_init_one_queue(smmu, &smmu->evtq.q,
+				      ARM_SMMU_EVTQ_PROD(smmu),
+				      ARM_SMMU_EVTQ_CONS(smmu),
+				      EVTQ_ENT_DWORDS);
 	if (ret)
 		return ret;
 
@@ -1995,8 +2011,10 @@ static int arm_smmu_init_queues(struct arm_smmu_device *smmu)
 	if (!(smmu->features & ARM_SMMU_FEAT_PRI))
 		return 0;
 
-	return arm_smmu_init_one_queue(smmu, &smmu->priq.q, ARM_SMMU_PRIQ_PROD,
-				       ARM_SMMU_PRIQ_CONS, PRIQ_ENT_DWORDS);
+	return arm_smmu_init_one_queue(smmu, &smmu->priq.q,
+				       ARM_SMMU_PRIQ_PROD(smmu),
+				       ARM_SMMU_PRIQ_CONS(smmu),
+				       PRIQ_ENT_DWORDS);
 }
 
 static int arm_smmu_init_l1_strtab(struct arm_smmu_device *smmu)
@@ -2363,8 +2381,10 @@ static int arm_smmu_device_reset(struct arm_smmu_device *smmu, bool bypass)
 
 	/* Event queue */
 	writeq_relaxed(smmu->evtq.q.q_base, smmu->base + ARM_SMMU_EVTQ_BASE);
-	writel_relaxed(smmu->evtq.q.prod, smmu->base + ARM_SMMU_EVTQ_PROD);
-	writel_relaxed(smmu->evtq.q.cons, smmu->base + ARM_SMMU_EVTQ_CONS);
+	writel_relaxed(smmu->evtq.q.prod, smmu->base +
+		       ARM_SMMU_EVTQ_PROD(smmu));
+	writel_relaxed(smmu->evtq.q.cons, smmu->base +
+		       ARM_SMMU_EVTQ_CONS(smmu));
 
 	enables |= CR0_EVTQEN;
 	ret = arm_smmu_write_reg_sync(smmu, enables, ARM_SMMU_CR0,
@@ -2379,9 +2399,9 @@ static int arm_smmu_device_reset(struct arm_smmu_device *smmu, bool bypass)
 		writeq_relaxed(smmu->priq.q.q_base,
 			       smmu->base + ARM_SMMU_PRIQ_BASE);
 		writel_relaxed(smmu->priq.q.prod,
-			       smmu->base + ARM_SMMU_PRIQ_PROD);
+			       smmu->base + ARM_SMMU_PRIQ_PROD(smmu));
 		writel_relaxed(smmu->priq.q.cons,
-			       smmu->base + ARM_SMMU_PRIQ_CONS);
+			       smmu->base + ARM_SMMU_PRIQ_CONS(smmu));
 
 		enables |= CR0_PRIQEN;
 		ret = arm_smmu_write_reg_sync(smmu, enables, ARM_SMMU_CR0,
-- 
1.8.3.1

[PATCH v2 1/7] iommu/arm-smmu-v3: Introduce SMMU option PAGE0_REGS_ONLY

[Geetha sowjanya]

From: Linu Cherian <linu.cherian@cavium.com>

Cavium ThunderX2 SMMU implementation doesn't support page 1 register space
and PAGE0_REGS_ONLY option will be enabled as an errata workaround.

This option when turned on, replaces all page 1 offsets used for
EVTQ_PROD/CONS, PRIQ_PROD/CONS register access with page 0 offsets.

Signed-off-by: Linu Cherian <linu.cherian@cavium.com>
Signed-off-by: Geetha Sowjanya <geethasowjanya.akula@cavium.com>
---
 drivers/iommu/arm-smmu-v3.c | 44 ++++++++++++++++++++++++++++++++------------
 1 file changed, 32 insertions(+), 12 deletions(-)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 380969a..107b4a6 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -176,15 +176,15 @@
 #define ARM_SMMU_CMDQ_CONS		0x9c
 
 #define ARM_SMMU_EVTQ_BASE		0xa0
-#define ARM_SMMU_EVTQ_PROD		0x100a8
-#define ARM_SMMU_EVTQ_CONS		0x100ac
+#define ARM_SMMU_EVTQ_PROD(smmu)	(page1_offset_adjust(0x100a8, smmu))
+#define ARM_SMMU_EVTQ_CONS(smmu)	(page1_offset_adjust(0x100ac, smmu))
 #define ARM_SMMU_EVTQ_IRQ_CFG0		0xb0
 #define ARM_SMMU_EVTQ_IRQ_CFG1		0xb8
 #define ARM_SMMU_EVTQ_IRQ_CFG2		0xbc
 
 #define ARM_SMMU_PRIQ_BASE		0xc0
-#define ARM_SMMU_PRIQ_PROD		0x100c8
-#define ARM_SMMU_PRIQ_CONS		0x100cc
+#define ARM_SMMU_PRIQ_PROD(smmu)	(page1_offset_adjust(0x100c8, smmu))
+#define ARM_SMMU_PRIQ_CONS(smmu)	(page1_offset_adjust(0x100cc, smmu))
 #define ARM_SMMU_PRIQ_IRQ_CFG0		0xd0
 #define ARM_SMMU_PRIQ_IRQ_CFG1		0xd8
 #define ARM_SMMU_PRIQ_IRQ_CFG2		0xdc
@@ -412,6 +412,9 @@
 #define MSI_IOVA_BASE			0x8000000
 #define MSI_IOVA_LENGTH			0x100000
 
+#define ARM_SMMU_PAGE0_REGS_ONLY(smmu)		\
+	((smmu)->options & ARM_SMMU_OPT_PAGE0_REGS_ONLY)
+
 static bool disable_bypass;
 module_param_named(disable_bypass, disable_bypass, bool, S_IRUGO);
 MODULE_PARM_DESC(disable_bypass,
@@ -597,6 +600,7 @@ struct arm_smmu_device {
 	u32				features;
 
 #define ARM_SMMU_OPT_SKIP_PREFETCH	(1 << 0)
+#define ARM_SMMU_OPT_PAGE0_REGS_ONLY    (1 << 1)
 	u32				options;
 
 	struct arm_smmu_cmdq		cmdq;
@@ -663,9 +667,19 @@ struct arm_smmu_option_prop {
 
 static struct arm_smmu_option_prop arm_smmu_options[] = {
 	{ ARM_SMMU_OPT_SKIP_PREFETCH, "hisilicon,broken-prefetch-cmd" },
+	{ ARM_SMMU_OPT_PAGE0_REGS_ONLY, "cavium-cn99xx,broken-page1-regspace"},
 	{ 0, NULL},
 };
 
+static inline unsigned long page1_offset_adjust(
+	unsigned long off, struct arm_smmu_device *smmu)
+{
+	if (!ARM_SMMU_PAGE0_REGS_ONLY(smmu))
+		return off;
+	else
+		return (off - SZ_64K);
+}
+
 static struct arm_smmu_domain *to_smmu_domain(struct iommu_domain *dom)
 {
 	return container_of(dom, struct arm_smmu_domain, domain);
@@ -1986,8 +2000,10 @@ static int arm_smmu_init_queues(struct arm_smmu_device *smmu)
 		return ret;
 
 	/* evtq */
-	ret = arm_smmu_init_one_queue(smmu, &smmu->evtq.q, ARM_SMMU_EVTQ_PROD,
-				      ARM_SMMU_EVTQ_CONS, EVTQ_ENT_DWORDS);
+	ret = arm_smmu_init_one_queue(smmu, &smmu->evtq.q,
+				      ARM_SMMU_EVTQ_PROD(smmu),
+				      ARM_SMMU_EVTQ_CONS(smmu),
+				      EVTQ_ENT_DWORDS);
 	if (ret)
 		return ret;
 
@@ -1995,8 +2011,10 @@ static int arm_smmu_init_queues(struct arm_smmu_device *smmu)
 	if (!(smmu->features & ARM_SMMU_FEAT_PRI))
 		return 0;
 
-	return arm_smmu_init_one_queue(smmu, &smmu->priq.q, ARM_SMMU_PRIQ_PROD,
-				       ARM_SMMU_PRIQ_CONS, PRIQ_ENT_DWORDS);
+	return arm_smmu_init_one_queue(smmu, &smmu->priq.q,
+				       ARM_SMMU_PRIQ_PROD(smmu),
+				       ARM_SMMU_PRIQ_CONS(smmu),
+				       PRIQ_ENT_DWORDS);
 }
 
 static int arm_smmu_init_l1_strtab(struct arm_smmu_device *smmu)
@@ -2363,8 +2381,10 @@ static int arm_smmu_device_reset(struct arm_smmu_device *smmu, bool bypass)
 
 	/* Event queue */
 	writeq_relaxed(smmu->evtq.q.q_base, smmu->base + ARM_SMMU_EVTQ_BASE);
-	writel_relaxed(smmu->evtq.q.prod, smmu->base + ARM_SMMU_EVTQ_PROD);
-	writel_relaxed(smmu->evtq.q.cons, smmu->base + ARM_SMMU_EVTQ_CONS);
+	writel_relaxed(smmu->evtq.q.prod, smmu->base +
+		       ARM_SMMU_EVTQ_PROD(smmu));
+	writel_relaxed(smmu->evtq.q.cons, smmu->base +
+		       ARM_SMMU_EVTQ_CONS(smmu));
 
 	enables |= CR0_EVTQEN;
 	ret = arm_smmu_write_reg_sync(smmu, enables, ARM_SMMU_CR0,
@@ -2379,9 +2399,9 @@ static int arm_smmu_device_reset(struct arm_smmu_device *smmu, bool bypass)
 		writeq_relaxed(smmu->priq.q.q_base,
 			       smmu->base + ARM_SMMU_PRIQ_BASE);
 		writel_relaxed(smmu->priq.q.prod,
-			       smmu->base + ARM_SMMU_PRIQ_PROD);
+			       smmu->base + ARM_SMMU_PRIQ_PROD(smmu));
 		writel_relaxed(smmu->priq.q.cons,
-			       smmu->base + ARM_SMMU_PRIQ_CONS);
+			       smmu->base + ARM_SMMU_PRIQ_CONS(smmu));
 
 		enables |= CR0_PRIQEN;
 		ret = arm_smmu_write_reg_sync(smmu, enables, ARM_SMMU_CR0,
-- 
1.8.3.1

[PATCH v2 2/7] iommu/arm-smmu-v3: Do resource size checks based on SMMU

[Geetha sowjanya]

From: Linu Cherian <linu.cherian-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>

With implementations supporting only page 0 register space,
resource size can be 64k as well and hence perform size checks
based on SMMU option PAGE0_REGS_ONLY.

For this, arm_smmu_device_dt_probe/acpi_probe has been moved before
platform_get_resource call, so that SMMU options are set beforehand.

Signed-off-by:  Linu Cherian <linu.cherian-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>
Signed-off-by:  Geetha Sowjanya <geethasowjanya.akula-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>
---
 drivers/iommu/arm-smmu-v3.c | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 107b4a6..f027676 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2672,6 +2672,14 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev,
 	return ret;
 }
 
+static unsigned long arm_smmu_resource_size(struct arm_smmu_device *smmu)
+{
+	if (ARM_SMMU_PAGE0_REGS_ONLY(smmu))
+		return SZ_64K;
+	else
+		return SZ_128K;
+}
+
 static int arm_smmu_device_probe(struct platform_device *pdev)
 {
 	int irq, ret;
@@ -2688,9 +2696,17 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
 	}
 	smmu->dev = dev;
 
+	if (dev->of_node) {
+		ret = arm_smmu_device_dt_probe(pdev, smmu);
+	} else {
+		ret = arm_smmu_device_acpi_probe(pdev, smmu);
+		if (ret == -ENODEV)
+			return ret;
+	}
+
 	/* Base address */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (resource_size(res) + 1 < SZ_128K) {
+	if (resource_size(res) + 1 < arm_smmu_resource_size(smmu)) {
 		dev_err(dev, "MMIO region too small (%pr)\n", res);
 		return -EINVAL;
 	}
@@ -2717,14 +2733,6 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
 	if (irq > 0)
 		smmu->gerr_irq = irq;
 
-	if (dev->of_node) {
-		ret = arm_smmu_device_dt_probe(pdev, smmu);
-	} else {
-		ret = arm_smmu_device_acpi_probe(pdev, smmu);
-		if (ret == -ENODEV)
-			return ret;
-	}
-
 	/* Set bypass mode according to firmware probing result */
 	bypass = !!ret;
 
-- 
1.8.3.1

[PATCH v2 2/7] iommu/arm-smmu-v3: Do resource size checks based on SMMU

[Geetha sowjanya]

From: Linu Cherian <linu.cherian@cavium.com>

With implementations supporting only page 0 register space,
resource size can be 64k as well and hence perform size checks
based on SMMU option PAGE0_REGS_ONLY.

For this, arm_smmu_device_dt_probe/acpi_probe has been moved before
platform_get_resource call, so that SMMU options are set beforehand.

Signed-off-by:  Linu Cherian <linu.cherian@cavium.com>
Signed-off-by:  Geetha Sowjanya <geethasowjanya.akula@cavium.com>
---
 drivers/iommu/arm-smmu-v3.c | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 107b4a6..f027676 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2672,6 +2672,14 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev,
 	return ret;
 }
 
+static unsigned long arm_smmu_resource_size(struct arm_smmu_device *smmu)
+{
+	if (ARM_SMMU_PAGE0_REGS_ONLY(smmu))
+		return SZ_64K;
+	else
+		return SZ_128K;
+}
+
 static int arm_smmu_device_probe(struct platform_device *pdev)
 {
 	int irq, ret;
@@ -2688,9 +2696,17 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
 	}
 	smmu->dev = dev;
 
+	if (dev->of_node) {
+		ret = arm_smmu_device_dt_probe(pdev, smmu);
+	} else {
+		ret = arm_smmu_device_acpi_probe(pdev, smmu);
+		if (ret == -ENODEV)
+			return ret;
+	}
+
 	/* Base address */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (resource_size(res) + 1 < SZ_128K) {
+	if (resource_size(res) + 1 < arm_smmu_resource_size(smmu)) {
 		dev_err(dev, "MMIO region too small (%pr)\n", res);
 		return -EINVAL;
 	}
@@ -2717,14 +2733,6 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
 	if (irq > 0)
 		smmu->gerr_irq = irq;
 
-	if (dev->of_node) {
-		ret = arm_smmu_device_dt_probe(pdev, smmu);
-	} else {
-		ret = arm_smmu_device_acpi_probe(pdev, smmu);
-		if (ret == -ENODEV)
-			return ret;
-	}
-
 	/* Set bypass mode according to firmware probing result */
 	bypass = !!ret;
 
-- 
1.8.3.1

[PATCH v2 2/7] iommu/arm-smmu-v3: Do resource size checks based on SMMU

[Geetha sowjanya]

From: Linu Cherian <linu.cherian@cavium.com>

With implementations supporting only page 0 register space,
resource size can be 64k as well and hence perform size checks
based on SMMU option PAGE0_REGS_ONLY.

For this, arm_smmu_device_dt_probe/acpi_probe has been moved before
platform_get_resource call, so that SMMU options are set beforehand.

Signed-off-by:  Linu Cherian <linu.cherian@cavium.com>
Signed-off-by:  Geetha Sowjanya <geethasowjanya.akula@cavium.com>
---
 drivers/iommu/arm-smmu-v3.c | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 107b4a6..f027676 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2672,6 +2672,14 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev,
 	return ret;
 }
 
+static unsigned long arm_smmu_resource_size(struct arm_smmu_device *smmu)
+{
+	if (ARM_SMMU_PAGE0_REGS_ONLY(smmu))
+		return SZ_64K;
+	else
+		return SZ_128K;
+}
+
 static int arm_smmu_device_probe(struct platform_device *pdev)
 {
 	int irq, ret;
@@ -2688,9 +2696,17 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
 	}
 	smmu->dev = dev;
 
+	if (dev->of_node) {
+		ret = arm_smmu_device_dt_probe(pdev, smmu);
+	} else {
+		ret = arm_smmu_device_acpi_probe(pdev, smmu);
+		if (ret == -ENODEV)
+			return ret;
+	}
+
 	/* Base address */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (resource_size(res) + 1 < SZ_128K) {
+	if (resource_size(res) + 1 < arm_smmu_resource_size(smmu)) {
 		dev_err(dev, "MMIO region too small (%pr)\n", res);
 		return -EINVAL;
 	}
@@ -2717,14 +2733,6 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
 	if (irq > 0)
 		smmu->gerr_irq = irq;
 
-	if (dev->of_node) {
-		ret = arm_smmu_device_dt_probe(pdev, smmu);
-	} else {
-		ret = arm_smmu_device_acpi_probe(pdev, smmu);
-		if (ret == -ENODEV)
-			return ret;
-	}
-
 	/* Set bypass mode according to firmware probing result */
 	bypass = !!ret;
 
-- 
1.8.3.1

[PATCH v2 3/7] ACPICA: IORT: Add Cavium ThunderX2 SMMUv3 model definition.

[Geetha sowjanya]

From: Linu Cherian <linu.cherian-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>

Add SMMUv3 model definition for ThunderX2.

Signed-off-by: Linu Cherian <linu.cherian-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>
Signed-off-by: Geetha Sowjanya <geethasowjanya.akula-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>
---
 include/acpi/actbl2.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h
index faa9f2c..76a6f5d 100644
--- a/include/acpi/actbl2.h
+++ b/include/acpi/actbl2.h
@@ -779,6 +779,8 @@ struct acpi_iort_smmu {
 #define ACPI_IORT_SMMU_CORELINK_MMU400  0x00000002	/* ARM Corelink MMU-400 */
 #define ACPI_IORT_SMMU_CORELINK_MMU500  0x00000003	/* ARM Corelink MMU-500 */
 
+#define ACPI_IORT_SMMU_V3_CAVIUM_CN99XX 0x00000002 /* Cavium ThunderX2 SMMUv3 */
+
 /* Masks for Flags field above */
 
 #define ACPI_IORT_SMMU_DVM_SUPPORTED    (1)
-- 
1.8.3.1

[PATCH v2 3/7] ACPICA: IORT: Add Cavium ThunderX2 SMMUv3 model definition.

[Geetha sowjanya]

From: Linu Cherian <linu.cherian@cavium.com>

Add SMMUv3 model definition for ThunderX2.

Signed-off-by: Linu Cherian <linu.cherian@cavium.com>
Signed-off-by: Geetha Sowjanya <geethasowjanya.akula@cavium.com>
---
 include/acpi/actbl2.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h
index faa9f2c..76a6f5d 100644
--- a/include/acpi/actbl2.h
+++ b/include/acpi/actbl2.h
@@ -779,6 +779,8 @@ struct acpi_iort_smmu {
 #define ACPI_IORT_SMMU_CORELINK_MMU400  0x00000002	/* ARM Corelink MMU-400 */
 #define ACPI_IORT_SMMU_CORELINK_MMU500  0x00000003	/* ARM Corelink MMU-500 */
 
+#define ACPI_IORT_SMMU_V3_CAVIUM_CN99XX 0x00000002 /* Cavium ThunderX2 SMMUv3 */
+
 /* Masks for Flags field above */
 
 #define ACPI_IORT_SMMU_DVM_SUPPORTED    (1)
-- 
1.8.3.1

[PATCH v2 3/7] ACPICA: IORT: Add Cavium ThunderX2 SMMUv3 model definition.

[Geetha sowjanya]

From: Linu Cherian <linu.cherian@cavium.com>

Add SMMUv3 model definition for ThunderX2.

Signed-off-by: Linu Cherian <linu.cherian@cavium.com>
Signed-off-by: Geetha Sowjanya <geethasowjanya.akula@cavium.com>
---
 include/acpi/actbl2.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h
index faa9f2c..76a6f5d 100644
--- a/include/acpi/actbl2.h
+++ b/include/acpi/actbl2.h
@@ -779,6 +779,8 @@ struct acpi_iort_smmu {
 #define ACPI_IORT_SMMU_CORELINK_MMU400  0x00000002	/* ARM Corelink MMU-400 */
 #define ACPI_IORT_SMMU_CORELINK_MMU500  0x00000003	/* ARM Corelink MMU-500 */
 
+#define ACPI_IORT_SMMU_V3_CAVIUM_CN99XX 0x00000002 /* Cavium ThunderX2 SMMUv3 */
+
 /* Masks for Flags field above */
 
 #define ACPI_IORT_SMMU_DVM_SUPPORTED    (1)
-- 
1.8.3.1

[PATCH v2 4/7] iommu/arm-smmu-v3: For ACPI based device probing, set PAGE0_REGS_ONLY option for ThunderX2 SMMUv3 implementation.

[Geetha sowjanya]

From: Linu Cherian <linu.cherian-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>

Enable PAGE0_REGS_ONLY option for Cavium ThunderX2 SMMUv3 model.

Signed-off-by: Linu Cherian <linu.cherian-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>
Signed-off-by: Geetha Sowjanya <geethasowjanya.akula-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>
---
 drivers/iommu/arm-smmu-v3.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index f027676..8f7d8ad 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2625,6 +2625,14 @@ static int arm_smmu_device_hw_probe(struct arm_smmu_device *smmu)
 }
 
 #ifdef CONFIG_ACPI
+static void acpi_smmu_get_options(u32 model, struct arm_smmu_device *smmu)
+{
+	if (model == ACPI_IORT_SMMU_V3_CAVIUM_CN99XX)
+		smmu->options |= ARM_SMMU_OPT_PAGE0_REGS_ONLY;
+
+	dev_notice(smmu->dev, "option mask 0x%x\n", smmu->options);
+}
+
 static int arm_smmu_device_acpi_probe(struct platform_device *pdev,
 				      struct arm_smmu_device *smmu)
 {
@@ -2637,6 +2645,8 @@ static int arm_smmu_device_acpi_probe(struct platform_device *pdev,
 	/* Retrieve SMMUv3 specific data */
 	iort_smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
 
+	acpi_smmu_get_options(iort_smmu->model, smmu);
+
 	if (iort_smmu->flags & ACPI_IORT_SMMU_V3_COHACC_OVERRIDE)
 		smmu->features |= ARM_SMMU_FEAT_COHERENCY;
 
-- 
1.8.3.1

[PATCH v2 4/7] iommu/arm-smmu-v3: For ACPI based device probing, set PAGE0_REGS_ONLY option for ThunderX2 SMMUv3 implementation.

[Geetha sowjanya]

From: Linu Cherian <linu.cherian@cavium.com>

Enable PAGE0_REGS_ONLY option for Cavium ThunderX2 SMMUv3 model.

Signed-off-by: Linu Cherian <linu.cherian@cavium.com>
Signed-off-by: Geetha Sowjanya <geethasowjanya.akula@cavium.com>
---
 drivers/iommu/arm-smmu-v3.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index f027676..8f7d8ad 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2625,6 +2625,14 @@ static int arm_smmu_device_hw_probe(struct arm_smmu_device *smmu)
 }
 
 #ifdef CONFIG_ACPI
+static void acpi_smmu_get_options(u32 model, struct arm_smmu_device *smmu)
+{
+	if (model == ACPI_IORT_SMMU_V3_CAVIUM_CN99XX)
+		smmu->options |= ARM_SMMU_OPT_PAGE0_REGS_ONLY;
+
+	dev_notice(smmu->dev, "option mask 0x%x\n", smmu->options);
+}
+
 static int arm_smmu_device_acpi_probe(struct platform_device *pdev,
 				      struct arm_smmu_device *smmu)
 {
@@ -2637,6 +2645,8 @@ static int arm_smmu_device_acpi_probe(struct platform_device *pdev,
 	/* Retrieve SMMUv3 specific data */
 	iort_smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
 
+	acpi_smmu_get_options(iort_smmu->model, smmu);
+
 	if (iort_smmu->flags & ACPI_IORT_SMMU_V3_COHACC_OVERRIDE)
 		smmu->features |= ARM_SMMU_FEAT_COHERENCY;
 
-- 
1.8.3.1

[PATCH v2 4/7] iommu/arm-smmu-v3: For ACPI based device probing, set PAGE0_REGS_ONLY option for ThunderX2 SMMUv3 implementation.

[Geetha sowjanya]

From: Linu Cherian <linu.cherian@cavium.com>

Enable PAGE0_REGS_ONLY option for Cavium ThunderX2 SMMUv3 model.

Signed-off-by: Linu Cherian <linu.cherian@cavium.com>
Signed-off-by: Geetha Sowjanya <geethasowjanya.akula@cavium.com>
---
 drivers/iommu/arm-smmu-v3.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index f027676..8f7d8ad 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2625,6 +2625,14 @@ static int arm_smmu_device_hw_probe(struct arm_smmu_device *smmu)
 }
 
 #ifdef CONFIG_ACPI
+static void acpi_smmu_get_options(u32 model, struct arm_smmu_device *smmu)
+{
+	if (model == ACPI_IORT_SMMU_V3_CAVIUM_CN99XX)
+		smmu->options |= ARM_SMMU_OPT_PAGE0_REGS_ONLY;
+
+	dev_notice(smmu->dev, "option mask 0x%x\n", smmu->options);
+}
+
 static int arm_smmu_device_acpi_probe(struct platform_device *pdev,
 				      struct arm_smmu_device *smmu)
 {
@@ -2637,6 +2645,8 @@ static int arm_smmu_device_acpi_probe(struct platform_device *pdev,
 	/* Retrieve SMMUv3 specific data */
 	iort_smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
 
+	acpi_smmu_get_options(iort_smmu->model, smmu);
+
 	if (iort_smmu->flags & ACPI_IORT_SMMU_V3_COHACC_OVERRIDE)
 		smmu->features |= ARM_SMMU_FEAT_COHERENCY;
 
-- 
1.8.3.1

[PATCH v2 5/7] ACPI/IORT: Fixup SMMUv3 resource size for Cavium ThunderX2 SMMUv3 model

[Geetha sowjanya]

From: Linu Cherian <linu.cherian-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>

Cavium ThunderX2 implementation doesn't support second page in SMMU
register space. Hence, resource size is set as 64k for this model.

Signed-off-by: Linu Cherian <linu.cherian-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>
Signed-off-by: Geetha Sowjanya <geethasowjanya.akula-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>
---
 drivers/acpi/arm64/iort.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index c5fecf9..23c5350 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -833,12 +833,20 @@ static void __init arm_smmu_v3_init_resources(struct resource *res,
 {
 	struct acpi_iort_smmu_v3 *smmu;
 	int num_res = 0;
+	unsigned long size = SZ_128K;
 
 	/* Retrieve SMMUv3 specific data */
 	smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
 
+	/*
+	 * Override the size, for Cavium ThunderX2 implementation
+	 * which doesn't support the page 1 SMMU register space.
+	 */
+	if (smmu->model == ACPI_IORT_SMMU_V3_CAVIUM_CN99XX)
+		size = SZ_64K;
+
 	res[num_res].start = smmu->base_address;
-	res[num_res].end = smmu->base_address + SZ_128K - 1;
+	res[num_res].end = smmu->base_address + size - 1;
 	res[num_res].flags = IORESOURCE_MEM;
 
 	num_res++;
-- 
1.8.3.1

[PATCH v2 5/7] ACPI/IORT: Fixup SMMUv3 resource size for Cavium ThunderX2 SMMUv3 model

[Geetha sowjanya]

From: Linu Cherian <linu.cherian@cavium.com>

Cavium ThunderX2 implementation doesn't support second page in SMMU
register space. Hence, resource size is set as 64k for this model.

Signed-off-by: Linu Cherian <linu.cherian@cavium.com>
Signed-off-by: Geetha Sowjanya <geethasowjanya.akula@cavium.com>
---
 drivers/acpi/arm64/iort.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index c5fecf9..23c5350 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -833,12 +833,20 @@ static void __init arm_smmu_v3_init_resources(struct resource *res,
 {
 	struct acpi_iort_smmu_v3 *smmu;
 	int num_res = 0;
+	unsigned long size = SZ_128K;
 
 	/* Retrieve SMMUv3 specific data */
 	smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
 
+	/*
+	 * Override the size, for Cavium ThunderX2 implementation
+	 * which doesn't support the page 1 SMMU register space.
+	 */
+	if (smmu->model == ACPI_IORT_SMMU_V3_CAVIUM_CN99XX)
+		size = SZ_64K;
+
 	res[num_res].start = smmu->base_address;
-	res[num_res].end = smmu->base_address + SZ_128K - 1;
+	res[num_res].end = smmu->base_address + size - 1;
 	res[num_res].flags = IORESOURCE_MEM;
 
 	num_res++;
-- 
1.8.3.1

[PATCH v2 5/7] ACPI/IORT: Fixup SMMUv3 resource size for Cavium ThunderX2 SMMUv3 model

[Geetha sowjanya]

From: Linu Cherian <linu.cherian@cavium.com>

Cavium ThunderX2 implementation doesn't support second page in SMMU
register space. Hence, resource size is set as 64k for this model.

Signed-off-by: Linu Cherian <linu.cherian@cavium.com>
Signed-off-by: Geetha Sowjanya <geethasowjanya.akula@cavium.com>
---
 drivers/acpi/arm64/iort.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index c5fecf9..23c5350 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -833,12 +833,20 @@ static void __init arm_smmu_v3_init_resources(struct resource *res,
 {
 	struct acpi_iort_smmu_v3 *smmu;
 	int num_res = 0;
+	unsigned long size = SZ_128K;
 
 	/* Retrieve SMMUv3 specific data */
 	smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
 
+	/*
+	 * Override the size, for Cavium ThunderX2 implementation
+	 * which doesn't support the page 1 SMMU register space.
+	 */
+	if (smmu->model == ACPI_IORT_SMMU_V3_CAVIUM_CN99XX)
+		size = SZ_64K;
+
 	res[num_res].start = smmu->base_address;
-	res[num_res].end = smmu->base_address + SZ_128K - 1;
+	res[num_res].end = smmu->base_address + size - 1;
 	res[num_res].flags = IORESOURCE_MEM;
 
 	num_res++;
-- 
1.8.3.1

[PATCH v2 6/7] iommu/arm-smmu-v3: Add workaround for Cavium ThunderX2 erratum #126

[Geetha sowjanya]

From: Geetha Sowjanya <geethasowjanya.akula-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>

Cavium ThunderX2 SMMU doesn't support MSI and also doesn't have unique irq
lines for gerror, eventq and cmdq-sync.

This patch addresses the issue by checking if any interrupt sources are
using same irq number, then they are registered as shared irqs.

Signed-off-by: Geetha Sowjanya <geethasowjanya.akula-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>
---
 drivers/iommu/arm-smmu-v3.c | 32 ++++++++++++++++++++++++++++----
 1 file changed, 28 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 016b702..46428e7 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2236,10 +2236,30 @@ static void arm_smmu_setup_msis(struct arm_smmu_device *smmu)
 	devm_add_action(dev, arm_smmu_free_msis, dev);
 }
 
+static int get_irq_flags(struct arm_smmu_device *smmu, int irq)
+{
+	int match_count = 0;
+
+	if (irq == smmu->evtq.q.irq)
+		match_count++;
+	if (irq == smmu->cmdq.q.irq)
+		match_count++;
+	if (irq == smmu->gerr_irq)
+		match_count++;
+	if (irq == smmu->priq.q.irq)
+		match_count++;
+
+	if (match_count > 1)
+		return IRQF_SHARED | IRQF_ONESHOT;
+
+	return 0;
+}
+
 static int arm_smmu_setup_irqs(struct arm_smmu_device *smmu)
 {
 	int ret, irq;
 	u32 irqen_flags = IRQ_CTRL_EVTQ_IRQEN | IRQ_CTRL_GERROR_IRQEN;
+	u32 irqflags = 0;
 
 	/* Disable IRQs first */
 	ret = arm_smmu_write_reg_sync(smmu, 0, ARM_SMMU_IRQ_CTRL,
@@ -2254,9 +2274,10 @@ static int arm_smmu_setup_irqs(struct arm_smmu_device *smmu)
 	/* Request interrupt lines */
 	irq = smmu->evtq.q.irq;
 	if (irq) {
+		irqflags = get_irq_flags(smmu, irq);
 		ret = devm_request_threaded_irq(smmu->dev, irq, NULL,
 						arm_smmu_evtq_thread,
-						IRQF_ONESHOT,
+						IRQF_ONESHOT | irqflags,
 						"arm-smmu-v3-evtq", smmu);
 		if (ret < 0)
 			dev_warn(smmu->dev, "failed to enable evtq irq\n");
@@ -2264,8 +2285,9 @@ static int arm_smmu_setup_irqs(struct arm_smmu_device *smmu)
 
 	irq = smmu->cmdq.q.irq;
 	if (irq) {
+		irqflags = get_irq_flags(smmu, irq);
 		ret = devm_request_irq(smmu->dev, irq,
-				       arm_smmu_cmdq_sync_handler, 0,
+				       arm_smmu_cmdq_sync_handler, irqflags,
 				       "arm-smmu-v3-cmdq-sync", smmu);
 		if (ret < 0)
 			dev_warn(smmu->dev, "failed to enable cmdq-sync irq\n");
@@ -2273,8 +2295,9 @@ static int arm_smmu_setup_irqs(struct arm_smmu_device *smmu)
 
 	irq = smmu->gerr_irq;
 	if (irq) {
+		irqflags = get_irq_flags(smmu, irq);
 		ret = devm_request_irq(smmu->dev, irq, arm_smmu_gerror_handler,
-				       0, "arm-smmu-v3-gerror", smmu);
+				       irqflags, "arm-smmu-v3-gerror", smmu);
 		if (ret < 0)
 			dev_warn(smmu->dev, "failed to enable gerror irq\n");
 	}
@@ -2282,9 +2305,10 @@ static int arm_smmu_setup_irqs(struct arm_smmu_device *smmu)
 	if (smmu->features & ARM_SMMU_FEAT_PRI) {
 		irq = smmu->priq.q.irq;
 		if (irq) {
+			irqflags = get_irq_flags(smmu, irq);
 			ret = devm_request_threaded_irq(smmu->dev, irq, NULL,
 							arm_smmu_priq_thread,
-							IRQF_ONESHOT,
+							IRQF_ONESHOT | irqflags,
 							"arm-smmu-v3-priq",
 							smmu);
 			if (ret < 0)
-- 
1.8.3.1

[PATCH v2 6/7] iommu/arm-smmu-v3: Add workaround for Cavium ThunderX2 erratum #126

[Geetha sowjanya]

From: Geetha Sowjanya <geethasowjanya.akula@cavium.com>

Cavium ThunderX2 SMMU doesn't support MSI and also doesn't have unique irq
lines for gerror, eventq and cmdq-sync.

This patch addresses the issue by checking if any interrupt sources are
using same irq number, then they are registered as shared irqs.

Signed-off-by: Geetha Sowjanya <geethasowjanya.akula@cavium.com>
---
 drivers/iommu/arm-smmu-v3.c | 32 ++++++++++++++++++++++++++++----
 1 file changed, 28 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 016b702..46428e7 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2236,10 +2236,30 @@ static void arm_smmu_setup_msis(struct arm_smmu_device *smmu)
 	devm_add_action(dev, arm_smmu_free_msis, dev);
 }
 
+static int get_irq_flags(struct arm_smmu_device *smmu, int irq)
+{
+	int match_count = 0;
+
+	if (irq == smmu->evtq.q.irq)
+		match_count++;
+	if (irq == smmu->cmdq.q.irq)
+		match_count++;
+	if (irq == smmu->gerr_irq)
+		match_count++;
+	if (irq == smmu->priq.q.irq)
+		match_count++;
+
+	if (match_count > 1)
+		return IRQF_SHARED | IRQF_ONESHOT;
+
+	return 0;
+}
+
 static int arm_smmu_setup_irqs(struct arm_smmu_device *smmu)
 {
 	int ret, irq;
 	u32 irqen_flags = IRQ_CTRL_EVTQ_IRQEN | IRQ_CTRL_GERROR_IRQEN;
+	u32 irqflags = 0;
 
 	/* Disable IRQs first */
 	ret = arm_smmu_write_reg_sync(smmu, 0, ARM_SMMU_IRQ_CTRL,
@@ -2254,9 +2274,10 @@ static int arm_smmu_setup_irqs(struct arm_smmu_device *smmu)
 	/* Request interrupt lines */
 	irq = smmu->evtq.q.irq;
 	if (irq) {
+		irqflags = get_irq_flags(smmu, irq);
 		ret = devm_request_threaded_irq(smmu->dev, irq, NULL,
 						arm_smmu_evtq_thread,
-						IRQF_ONESHOT,
+						IRQF_ONESHOT | irqflags,
 						"arm-smmu-v3-evtq", smmu);
 		if (ret < 0)
 			dev_warn(smmu->dev, "failed to enable evtq irq\n");
@@ -2264,8 +2285,9 @@ static int arm_smmu_setup_irqs(struct arm_smmu_device *smmu)
 
 	irq = smmu->cmdq.q.irq;
 	if (irq) {
+		irqflags = get_irq_flags(smmu, irq);
 		ret = devm_request_irq(smmu->dev, irq,
-				       arm_smmu_cmdq_sync_handler, 0,
+				       arm_smmu_cmdq_sync_handler, irqflags,
 				       "arm-smmu-v3-cmdq-sync", smmu);
 		if (ret < 0)
 			dev_warn(smmu->dev, "failed to enable cmdq-sync irq\n");
@@ -2273,8 +2295,9 @@ static int arm_smmu_setup_irqs(struct arm_smmu_device *smmu)
 
 	irq = smmu->gerr_irq;
 	if (irq) {
+		irqflags = get_irq_flags(smmu, irq);
 		ret = devm_request_irq(smmu->dev, irq, arm_smmu_gerror_handler,
-				       0, "arm-smmu-v3-gerror", smmu);
+				       irqflags, "arm-smmu-v3-gerror", smmu);
 		if (ret < 0)
 			dev_warn(smmu->dev, "failed to enable gerror irq\n");
 	}
@@ -2282,9 +2305,10 @@ static int arm_smmu_setup_irqs(struct arm_smmu_device *smmu)
 	if (smmu->features & ARM_SMMU_FEAT_PRI) {
 		irq = smmu->priq.q.irq;
 		if (irq) {
+			irqflags = get_irq_flags(smmu, irq);
 			ret = devm_request_threaded_irq(smmu->dev, irq, NULL,
 							arm_smmu_priq_thread,
-							IRQF_ONESHOT,
+							IRQF_ONESHOT | irqflags,
 							"arm-smmu-v3-priq",
 							smmu);
 			if (ret < 0)
-- 
1.8.3.1

[PATCH v2 6/7] iommu/arm-smmu-v3: Add workaround for Cavium ThunderX2 erratum #126

[Geetha sowjanya]

From: Geetha Sowjanya <geethasowjanya.akula@cavium.com>

Cavium ThunderX2 SMMU doesn't support MSI and also doesn't have unique irq
lines for gerror, eventq and cmdq-sync.

This patch addresses the issue by checking if any interrupt sources are
using same irq number, then they are registered as shared irqs.

Signed-off-by: Geetha Sowjanya <geethasowjanya.akula@cavium.com>
---
 drivers/iommu/arm-smmu-v3.c | 32 ++++++++++++++++++++++++++++----
 1 file changed, 28 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 016b702..46428e7 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2236,10 +2236,30 @@ static void arm_smmu_setup_msis(struct arm_smmu_device *smmu)
 	devm_add_action(dev, arm_smmu_free_msis, dev);
 }
 
+static int get_irq_flags(struct arm_smmu_device *smmu, int irq)
+{
+	int match_count = 0;
+
+	if (irq == smmu->evtq.q.irq)
+		match_count++;
+	if (irq == smmu->cmdq.q.irq)
+		match_count++;
+	if (irq == smmu->gerr_irq)
+		match_count++;
+	if (irq == smmu->priq.q.irq)
+		match_count++;
+
+	if (match_count > 1)
+		return IRQF_SHARED | IRQF_ONESHOT;
+
+	return 0;
+}
+
 static int arm_smmu_setup_irqs(struct arm_smmu_device *smmu)
 {
 	int ret, irq;
 	u32 irqen_flags = IRQ_CTRL_EVTQ_IRQEN | IRQ_CTRL_GERROR_IRQEN;
+	u32 irqflags = 0;
 
 	/* Disable IRQs first */
 	ret = arm_smmu_write_reg_sync(smmu, 0, ARM_SMMU_IRQ_CTRL,
@@ -2254,9 +2274,10 @@ static int arm_smmu_setup_irqs(struct arm_smmu_device *smmu)
 	/* Request interrupt lines */
 	irq = smmu->evtq.q.irq;
 	if (irq) {
+		irqflags = get_irq_flags(smmu, irq);
 		ret = devm_request_threaded_irq(smmu->dev, irq, NULL,
 						arm_smmu_evtq_thread,
-						IRQF_ONESHOT,
+						IRQF_ONESHOT | irqflags,
 						"arm-smmu-v3-evtq", smmu);
 		if (ret < 0)
 			dev_warn(smmu->dev, "failed to enable evtq irq\n");
@@ -2264,8 +2285,9 @@ static int arm_smmu_setup_irqs(struct arm_smmu_device *smmu)
 
 	irq = smmu->cmdq.q.irq;
 	if (irq) {
+		irqflags = get_irq_flags(smmu, irq);
 		ret = devm_request_irq(smmu->dev, irq,
-				       arm_smmu_cmdq_sync_handler, 0,
+				       arm_smmu_cmdq_sync_handler, irqflags,
 				       "arm-smmu-v3-cmdq-sync", smmu);
 		if (ret < 0)
 			dev_warn(smmu->dev, "failed to enable cmdq-sync irq\n");
@@ -2273,8 +2295,9 @@ static int arm_smmu_setup_irqs(struct arm_smmu_device *smmu)
 
 	irq = smmu->gerr_irq;
 	if (irq) {
+		irqflags = get_irq_flags(smmu, irq);
 		ret = devm_request_irq(smmu->dev, irq, arm_smmu_gerror_handler,
-				       0, "arm-smmu-v3-gerror", smmu);
+				       irqflags, "arm-smmu-v3-gerror", smmu);
 		if (ret < 0)
 			dev_warn(smmu->dev, "failed to enable gerror irq\n");
 	}
@@ -2282,9 +2305,10 @@ static int arm_smmu_setup_irqs(struct arm_smmu_device *smmu)
 	if (smmu->features & ARM_SMMU_FEAT_PRI) {
 		irq = smmu->priq.q.irq;
 		if (irq) {
+			irqflags = get_irq_flags(smmu, irq);
 			ret = devm_request_threaded_irq(smmu->dev, irq, NULL,
 							arm_smmu_priq_thread,
-							IRQF_ONESHOT,
+							IRQF_ONESHOT | irqflags,
 							"arm-smmu-v3-priq",
 							smmu);
 			if (ret < 0)
-- 
1.8.3.1

[PATCH v2 7/7] arm64: Documentation: Add Cavium ThunderX2 SMMUv3 erratas

[Geetha sowjanya]

From: Linu Cherian <linu.cherian-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>

Add Cavium ThunderX2 SMMUv3 erratas to the errata list.

Signed-off-by: Linu Cherian <linu.cherian-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>
Signed-off-by: Geetha Sowjanya <geethasowjanya.akula-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>
---
 Documentation/arm64/silicon-errata.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/arm64/silicon-errata.txt b/Documentation/arm64/silicon-errata.txt
index 10f2ddd..42422f6 100644
--- a/Documentation/arm64/silicon-errata.txt
+++ b/Documentation/arm64/silicon-errata.txt
@@ -62,6 +62,8 @@ stable kernels.
 | Cavium         | ThunderX GICv3  | #23154          | CAVIUM_ERRATUM_23154        |
 | Cavium         | ThunderX Core   | #27456          | CAVIUM_ERRATUM_27456        |
 | Cavium         | ThunderX SMMUv2 | #27704          | N/A                         |
+| Cavium         | ThunderX2 SMMUv3| #74             | N/A                         |
+| Cavium         | ThunderX2 SMMUv3| #126            | N/A                         |
 |                |                 |                 |                             |
 | Freescale/NXP  | LS2080A/LS1043A | A-008585        | FSL_ERRATUM_A008585         |
 |                |                 |                 |                             |
-- 
1.8.3.1

[PATCH v2 7/7] arm64: Documentation: Add Cavium ThunderX2 SMMUv3 erratas

[Geetha sowjanya]

From: Linu Cherian <linu.cherian@cavium.com>

Add Cavium ThunderX2 SMMUv3 erratas to the errata list.

Signed-off-by: Linu Cherian <linu.cherian@cavium.com>
Signed-off-by: Geetha Sowjanya <geethasowjanya.akula@cavium.com>
---
 Documentation/arm64/silicon-errata.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/arm64/silicon-errata.txt b/Documentation/arm64/silicon-errata.txt
index 10f2ddd..42422f6 100644
--- a/Documentation/arm64/silicon-errata.txt
+++ b/Documentation/arm64/silicon-errata.txt
@@ -62,6 +62,8 @@ stable kernels.
 | Cavium         | ThunderX GICv3  | #23154          | CAVIUM_ERRATUM_23154        |
 | Cavium         | ThunderX Core   | #27456          | CAVIUM_ERRATUM_27456        |
 | Cavium         | ThunderX SMMUv2 | #27704          | N/A                         |
+| Cavium         | ThunderX2 SMMUv3| #74             | N/A                         |
+| Cavium         | ThunderX2 SMMUv3| #126            | N/A                         |
 |                |                 |                 |                             |
 | Freescale/NXP  | LS2080A/LS1043A | A-008585        | FSL_ERRATUM_A008585         |
 |                |                 |                 |                             |
-- 
1.8.3.1

[PATCH v2 7/7] arm64: Documentation: Add Cavium ThunderX2 SMMUv3 erratas

[Geetha sowjanya]

From: Linu Cherian <linu.cherian@cavium.com>

Add Cavium ThunderX2 SMMUv3 erratas to the errata list.

Signed-off-by: Linu Cherian <linu.cherian@cavium.com>
Signed-off-by: Geetha Sowjanya <geethasowjanya.akula@cavium.com>
---
 Documentation/arm64/silicon-errata.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/arm64/silicon-errata.txt b/Documentation/arm64/silicon-errata.txt
index 10f2ddd..42422f6 100644
--- a/Documentation/arm64/silicon-errata.txt
+++ b/Documentation/arm64/silicon-errata.txt
@@ -62,6 +62,8 @@ stable kernels.
 | Cavium         | ThunderX GICv3  | #23154          | CAVIUM_ERRATUM_23154        |
 | Cavium         | ThunderX Core   | #27456          | CAVIUM_ERRATUM_27456        |
 | Cavium         | ThunderX SMMUv2 | #27704          | N/A                         |
+| Cavium         | ThunderX2 SMMUv3| #74             | N/A                         |
+| Cavium         | ThunderX2 SMMUv3| #126            | N/A                         |
 |                |                 |                 |                             |
 | Freescale/NXP  | LS2080A/LS1043A | A-008585        | FSL_ERRATUM_A008585         |
 |                |                 |                 |                             |
-- 
1.8.3.1

Re: [PATCH v2 1/7] iommu/arm-smmu-v3: Introduce SMMU option PAGE0_REGS_ONLY

[Mark Rutland]

On Thu, May 04, 2017 at 06:05:33PM +0530, Geetha sowjanya wrote:
> From: Linu Cherian <linu.cherian@cavium.com>
> 
> Cavium ThunderX2 SMMU implementation doesn't support page 1 register space
> and PAGE0_REGS_ONLY option will be enabled as an errata workaround.
> 
> This option when turned on, replaces all page 1 offsets used for
> EVTQ_PROD/CONS, PRIQ_PROD/CONS register access with page 0 offsets.
> 
> Signed-off-by: Linu Cherian <linu.cherian@cavium.com>
> Signed-off-by: Geetha Sowjanya <geethasowjanya.akula@cavium.com>
> ---
>  drivers/iommu/arm-smmu-v3.c | 44 ++++++++++++++++++++++++++++++++------------
>  1 file changed, 32 insertions(+), 12 deletions(-)

>  static struct arm_smmu_option_prop arm_smmu_options[] = {

> +	{ ARM_SMMU_OPT_PAGE0_REGS_ONLY, "cavium-cn99xx,broken-page1-regspace"},

No patch in this series documented the new property.

Please update Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt,
with a description of the property. i.e. what it describes, and when it
should be set.

Please either make that a prepatory path, or merge it in with this one.

Thanksm
Mark.

[PATCH v2 1/7] iommu/arm-smmu-v3: Introduce SMMU option PAGE0_REGS_ONLY

[Mark Rutland]

On Thu, May 04, 2017 at 06:05:33PM +0530, Geetha sowjanya wrote:
> From: Linu Cherian <linu.cherian@cavium.com>
> 
> Cavium ThunderX2 SMMU implementation doesn't support page 1 register space
> and PAGE0_REGS_ONLY option will be enabled as an errata workaround.
> 
> This option when turned on, replaces all page 1 offsets used for
> EVTQ_PROD/CONS, PRIQ_PROD/CONS register access with page 0 offsets.
> 
> Signed-off-by: Linu Cherian <linu.cherian@cavium.com>
> Signed-off-by: Geetha Sowjanya <geethasowjanya.akula@cavium.com>
> ---
>  drivers/iommu/arm-smmu-v3.c | 44 ++++++++++++++++++++++++++++++++------------
>  1 file changed, 32 insertions(+), 12 deletions(-)

>  static struct arm_smmu_option_prop arm_smmu_options[] = {

> +	{ ARM_SMMU_OPT_PAGE0_REGS_ONLY, "cavium-cn99xx,broken-page1-regspace"},

No patch in this series documented the new property.

Please update Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt,
with a description of the property. i.e. what it describes, and when it
should be set.

Please either make that a prepatory path, or merge it in with this one.

Thanksm
Mark.