[PATCH v4 1/5] iommu/arm-smmu: Save additional information on context fault

[Connor Abbott]

This will be used by drm/msm for GPU page faults, replacing the manual
register reading it does.

Signed-off-by: Connor Abbott <cwabbott0 at gmail.com>
---
 drivers/iommu/arm/arm-smmu/arm-smmu-qcom-debug.c |  4 ++--
 drivers/iommu/arm/arm-smmu/arm-smmu.c            | 27 +++++++++++++-----------
 drivers/iommu/arm/arm-smmu/arm-smmu.h            |  5 ++++-
 3 files changed, 21 insertions(+), 15 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom-debug.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom-debug.c
index 548783f3f8e89fd978367afa65c473002f66e2e7..ae4fdbbce6ba80440f539557a39866a932360d4e 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom-debug.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom-debug.c
@@ -400,7 +400,7 @@ irqreturn_t qcom_smmu_context_fault(int irq, void *dev)
 
 	if (list_empty(&tbu_list)) {
 		ret = report_iommu_fault(&smmu_domain->domain, NULL, cfi.iova,
-					 cfi.fsynr & ARM_SMMU_CB_FSYNR0_WNR ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ);
+					 cfi.fsynr0 & ARM_SMMU_CB_FSYNR0_WNR ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ);
 
 		if (ret == -ENOSYS)
 			arm_smmu_print_context_fault_info(smmu, idx, &cfi);
@@ -412,7 +412,7 @@ irqreturn_t qcom_smmu_context_fault(int irq, void *dev)
 	phys_soft = ops->iova_to_phys(ops, cfi.iova);
 
 	tmp = report_iommu_fault(&smmu_domain->domain, NULL, cfi.iova,
-				 cfi.fsynr & ARM_SMMU_CB_FSYNR0_WNR ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ);
+				 cfi.fsynr0 & ARM_SMMU_CB_FSYNR0_WNR ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ);
 	if (!tmp || tmp == -EBUSY) {
 		ret = IRQ_HANDLED;
 		resume = ARM_SMMU_RESUME_TERMINATE;
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index ade4684c14c9b2724a71e2457288dbfaf7562c83..a9213e0f1579d1e3be0bfba75eea1d5de23117de 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -409,9 +409,12 @@ void arm_smmu_read_context_fault_info(struct arm_smmu_device *smmu, int idx,
 				      struct arm_smmu_context_fault_info *cfi)
 {
 	cfi->iova = arm_smmu_cb_readq(smmu, idx, ARM_SMMU_CB_FAR);
+	cfi->ttbr0 = arm_smmu_cb_readq(smmu, idx, ARM_SMMU_CB_TTBR0);
 	cfi->fsr = arm_smmu_cb_read(smmu, idx, ARM_SMMU_CB_FSR);
-	cfi->fsynr = arm_smmu_cb_read(smmu, idx, ARM_SMMU_CB_FSYNR0);
+	cfi->fsynr0 = arm_smmu_cb_read(smmu, idx, ARM_SMMU_CB_FSYNR0);
+	cfi->fsynr1 = arm_smmu_cb_read(smmu, idx, ARM_SMMU_CB_FSYNR1);
 	cfi->cbfrsynra = arm_smmu_gr1_read(smmu, ARM_SMMU_GR1_CBFRSYNRA(idx));
+	cfi->contextidr = arm_smmu_cb_read(smmu, idx, ARM_SMMU_CB_CONTEXTIDR);
 }
 
 void arm_smmu_print_context_fault_info(struct arm_smmu_device *smmu, int idx,
@@ -419,7 +422,7 @@ void arm_smmu_print_context_fault_info(struct arm_smmu_device *smmu, int idx,
 {
 	dev_err(smmu->dev,
 		"Unhandled context fault: fsr=0x%x, iova=0x%08lx, fsynr=0x%x, cbfrsynra=0x%x, cb=%d\n",
-		cfi->fsr, cfi->iova, cfi->fsynr, cfi->cbfrsynra, idx);
+		cfi->fsr, cfi->iova, cfi->fsynr0, cfi->cbfrsynra, idx);
 
 	dev_err(smmu->dev, "FSR    = %08x [%s%sFormat=%u%s%s%s%s%s%s%s%s], SID=0x%x\n",
 		cfi->fsr,
@@ -437,15 +440,15 @@ void arm_smmu_print_context_fault_info(struct arm_smmu_device *smmu, int idx,
 		cfi->cbfrsynra);
 
 	dev_err(smmu->dev, "FSYNR0 = %08x [S1CBNDX=%u%s%s%s%s%s%s PLVL=%u]\n",
-		cfi->fsynr,
-		(u32)FIELD_GET(ARM_SMMU_CB_FSYNR0_S1CBNDX, cfi->fsynr),
-		(cfi->fsynr & ARM_SMMU_CB_FSYNR0_AFR) ? " AFR" : "",
-		(cfi->fsynr & ARM_SMMU_CB_FSYNR0_PTWF) ? " PTWF" : "",
-		(cfi->fsynr & ARM_SMMU_CB_FSYNR0_NSATTR) ? " NSATTR" : "",
-		(cfi->fsynr & ARM_SMMU_CB_FSYNR0_IND) ? " IND" : "",
-		(cfi->fsynr & ARM_SMMU_CB_FSYNR0_PNU) ? " PNU" : "",
-		(cfi->fsynr & ARM_SMMU_CB_FSYNR0_WNR) ? " WNR" : "",
-		(u32)FIELD_GET(ARM_SMMU_CB_FSYNR0_PLVL, cfi->fsynr));
+		cfi->fsynr0,
+		(u32)FIELD_GET(ARM_SMMU_CB_FSYNR0_S1CBNDX, cfi->fsynr0),
+		(cfi->fsynr0 & ARM_SMMU_CB_FSYNR0_AFR) ? " AFR" : "",
+		(cfi->fsynr0 & ARM_SMMU_CB_FSYNR0_PTWF) ? " PTWF" : "",
+		(cfi->fsynr0 & ARM_SMMU_CB_FSYNR0_NSATTR) ? " NSATTR" : "",
+		(cfi->fsynr0 & ARM_SMMU_CB_FSYNR0_IND) ? " IND" : "",
+		(cfi->fsynr0 & ARM_SMMU_CB_FSYNR0_PNU) ? " PNU" : "",
+		(cfi->fsynr0 & ARM_SMMU_CB_FSYNR0_WNR) ? " WNR" : "",
+		(u32)FIELD_GET(ARM_SMMU_CB_FSYNR0_PLVL, cfi->fsynr0));
 }
 
 static irqreturn_t arm_smmu_context_fault(int irq, void *dev)
@@ -464,7 +467,7 @@ static irqreturn_t arm_smmu_context_fault(int irq, void *dev)
 		return IRQ_NONE;
 
 	ret = report_iommu_fault(&smmu_domain->domain, NULL, cfi.iova,
-		cfi.fsynr & ARM_SMMU_CB_FSYNR0_WNR ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ);
+		cfi.fsynr0 & ARM_SMMU_CB_FSYNR0_WNR ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ);
 
 	if (ret == -ENOSYS && __ratelimit(&rs))
 		arm_smmu_print_context_fault_info(smmu, idx, &cfi);
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.h b/drivers/iommu/arm/arm-smmu/arm-smmu.h
index e2aeb511ae903302e3c15d2cf5f22e2a26ac2346..d3bc77dcd4d40f25bc70f3289616fb866649b022 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.h
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.h
@@ -543,9 +543,12 @@ int arm_mmu500_reset(struct arm_smmu_device *smmu);
 
 struct arm_smmu_context_fault_info {
 	unsigned long iova;
+	u64 ttbr0;
 	u32 fsr;
-	u32 fsynr;
+	u32 fsynr0;
+	u32 fsynr1;
 	u32 cbfrsynra;
+	u32 contextidr;
 };
 
 void arm_smmu_read_context_fault_info(struct arm_smmu_device *smmu, int idx,

-- 
2.47.1