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[RFC,v1,1/2] iommu/arm-smmu-v3: Add implementation infrastructure

Message ID 20210723193140.9690-2-nicolinc@nvidia.com (mailing list archive)
State New, archived
Headers show
Series iommu/arm-smmu-v3: Add NVIDIA implementation | expand

Commit Message

Nicolin Chen July 23, 2021, 7:31 p.m. UTC 
From: Nate Watterson <nwatterson@nvidia.com>

Copy the arm-smmu driver's infrastructure for handling implementation
specific details outside the flow of architectural code.

Signed-off-by: Nate Watterson <nwatterson@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
---
 drivers/iommu/arm/arm-smmu-v3/Makefile           | 2 +-
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-impl.c | 8 ++++++++
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c      | 4 ++++
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h      | 4 ++++
 4 files changed, 17 insertions(+), 1 deletion(-)
 create mode 100644 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-impl.c
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Patch

diff --git a/drivers/iommu/arm/arm-smmu-v3/Makefile b/drivers/iommu/arm/arm-smmu-v3/Makefile
index 54feb1ecccad..1f5838d3351b 100644
--- a/drivers/iommu/arm/arm-smmu-v3/Makefile
+++ b/drivers/iommu/arm/arm-smmu-v3/Makefile
@@ -1,5 +1,5 @@ 
 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_ARM_SMMU_V3) += arm_smmu_v3.o
-arm_smmu_v3-objs-y += arm-smmu-v3.o
+arm_smmu_v3-objs-y += arm-smmu-v3.o arm-smmu-v3-impl.o
 arm_smmu_v3-objs-$(CONFIG_ARM_SMMU_V3_SVA) += arm-smmu-v3-sva.o
 arm_smmu_v3-objs := $(arm_smmu_v3-objs-y)
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-impl.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-impl.c
new file mode 100644
index 000000000000..6947d28067a8
--- /dev/null
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-impl.c
@@ -0,0 +1,8 @@ 
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include "arm-smmu-v3.h"
+
+struct arm_smmu_device *arm_smmu_v3_impl_init(struct arm_smmu_device *smmu)
+{
+	return smmu;
+}
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 235f9bdaeaf2..b2d23de2b207 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -3771,6 +3771,10 @@  static int arm_smmu_device_probe(struct platform_device *pdev)
 			return ret;
 	}
 
+	smmu = arm_smmu_v3_impl_init(smmu);
+	if (IS_ERR(smmu))
+		return PTR_ERR(smmu);
+
 	/* Set bypass mode according to firmware probing result */
 	bypass = !!ret;
 
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index 4cb136f07914..4c60ba14221b 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -806,4 +806,8 @@  static inline u32 arm_smmu_sva_get_pasid(struct iommu_sva *handle)
 
 static inline void arm_smmu_sva_notifier_synchronize(void) {}
 #endif /* CONFIG_ARM_SMMU_V3_SVA */
+
+/* Implementation details */
+struct arm_smmu_device *arm_smmu_v3_impl_init(struct arm_smmu_device *smmu);
+
 #endif /* _ARM_SMMU_V3_H */