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