[PATCH 3/7] iommu/arm-smmu: Add a SMMU variant for the Adreno GPU

[Jordan Crouse <jcrouse@codeaurora.org>]

Add a SMMU model for the Adreno GPU and use it to enable split
pagetable support if the conditions are right.

Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
---

 drivers/iommu/arm-smmu-impl.c | 15 +++++++++++++++
 drivers/iommu/arm-smmu.c      |  2 ++
 drivers/iommu/arm-smmu.h      |  1 +
 3 files changed, 18 insertions(+)

diff --git a/drivers/iommu/arm-smmu-impl.c b/drivers/iommu/arm-smmu-impl.c
index 3f88cd0..5d197dd 100644
--- a/drivers/iommu/arm-smmu-impl.c
+++ b/drivers/iommu/arm-smmu-impl.c
@@ -147,6 +147,18 @@ static const struct arm_smmu_impl arm_mmu500_impl = {
 	.reset = arm_mmu500_reset,
 };
 
+static int qcom_adreno_init_context(struct arm_smmu_domain *smmu_domain)
+{
+	if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1 &&
+		smmu_domain->cfg.fmt == ARM_SMMU_CTX_FMT_AARCH64)
+		smmu_domain->split_pagetables = true;
+
+	return 0;
+}
+
+static const struct arm_smmu_impl qcom_adreno_impl = {
+	.init_context = qcom_adreno_init_context,
+};
 
 struct arm_smmu_device *arm_smmu_impl_init(struct arm_smmu_device *smmu)
 {
@@ -162,6 +174,9 @@ struct arm_smmu_device *arm_smmu_impl_init(struct arm_smmu_device *smmu)
 		break;
 	case CAVIUM_SMMUV2:
 		return cavium_smmu_impl_init(smmu);
+	case QCOM_ADRENO_SMMUV2:
+		smmu->impl = &qcom_adreno_impl;
+		break;
 	default:
 		break;
 	}
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 39e81ef..3f41cf7 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1858,6 +1858,7 @@ ARM_SMMU_MATCH_DATA(arm_mmu401, ARM_SMMU_V1_64K, GENERIC_SMMU);
 ARM_SMMU_MATCH_DATA(arm_mmu500, ARM_SMMU_V2, ARM_MMU500);
 ARM_SMMU_MATCH_DATA(cavium_smmuv2, ARM_SMMU_V2, CAVIUM_SMMUV2);
 ARM_SMMU_MATCH_DATA(qcom_smmuv2, ARM_SMMU_V2, QCOM_SMMUV2);
+ARM_SMMU_MATCH_DATA(qcom_adreno_smmuv2, ARM_SMMU_V2, QCOM_ADRENO_SMMUV2);
 
 static const struct of_device_id arm_smmu_of_match[] = {
 	{ .compatible = "arm,smmu-v1", .data = &smmu_generic_v1 },
@@ -1867,6 +1868,7 @@ static const struct of_device_id arm_smmu_of_match[] = {
 	{ .compatible = "arm,mmu-500", .data = &arm_mmu500 },
 	{ .compatible = "cavium,smmu-v2", .data = &cavium_smmuv2 },
 	{ .compatible = "qcom,smmu-v2", .data = &qcom_smmuv2 },
+	{ .compatible = "qcom,adreno-smmu-v2", .data = &qcom_adreno_smmuv2 },
 	{ },
 };
 
diff --git a/drivers/iommu/arm-smmu.h b/drivers/iommu/arm-smmu.h
index 91a4eb8..e5a2cc8 100644
--- a/drivers/iommu/arm-smmu.h
+++ b/drivers/iommu/arm-smmu.h
@@ -222,6 +222,7 @@ enum arm_smmu_implementation {
 	ARM_MMU500,
 	CAVIUM_SMMUV2,
 	QCOM_SMMUV2,
+	QCOM_ADRENO_SMMUV2,
 };
 
 struct arm_smmu_device {
-- 
2.7.4