[RFC][PATCH v2 11/13] iommu/arm-smmu-v3: Add implementation infrastructure

From: Nicolin Chen <nicolinc@nvidia.com>
To: <will@kernel.org>, <robin.murphy@arm.com>, <joro@8bytes.org>,
	<alex.williamson@redhat.com>, <cohuck@redhat.com>,
	<corbet@lwn.net>
Cc: <nicoleotsuka@gmail.com>, <vdumpa@nvidia.com>,
	<thierry.reding@gmail.com>, <linux-tegra@vger.kernel.org>,
	<nwatterson@nvidia.com>, <Jonathan.Cameron@huawei.com>,
	<jean-philippe@linaro.org>, <song.bao.hua@hisilicon.com>,
	<eric.auger@redhat.com>, <thunder.leizhen@huawei.com>,
	<yuzenghui@huawei.com>, <linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<iommu@lists.linux-foundation.org>, <kvm@vger.kernel.org>,
	<linux-doc@vger.kernel.org>
Subject: [RFC][PATCH v2 11/13] iommu/arm-smmu-v3: Add implementation infrastructure
Date: Mon, 30 Aug 2021 19:59:21 -0700	[thread overview]
Message-ID: <20210831025923.15812-12-nicolinc@nvidia.com> (raw)
In-Reply-To: <20210831025923.15812-1-nicolinc@nvidia.com>

From: Nate Watterson <nwatterson@nvidia.com>

Follow 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

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 216f3442aac4..510e1493fd5a 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -3844,6 +3844,10 @@ 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 20463d17fd9f..c65c39336916 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -810,4 +810,8 @@ 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 */
-- 
2.17.1

