[RFC PATCH v2 09/58] iommu/arm-smmu-v3: Move IOMMU registration to arm-smmu-v3-common.c

[Mostafa Saleh <smostafa@google.com>]

From: Jean-Philippe Brucker <jean-philippe@linaro.org>

The KVM driver will need to implement a few IOMMU ops, so move the
helpers to arm-smmu-v3-common.

Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: Mostafa Saleh <smostafa@google.com>
---
 .../arm/arm-smmu-v3/arm-smmu-v3-common.c      | 27 +++++++++++++++++++
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   | 17 ++----------
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   |  4 +++
 3 files changed, 33 insertions(+), 15 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-common.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-common.c
index 04f1e2f1c458..b7bcac51cc7d 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-common.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-common.c
@@ -645,3 +645,30 @@ void arm_smmu_write_strtab(struct arm_smmu_device *smmu)
 		       smmu->base + ARM_SMMU_STRTAB_BASE);
 	writel_relaxed(reg, smmu->base + ARM_SMMU_STRTAB_BASE_CFG);
 }
+
+int arm_smmu_register_iommu(struct arm_smmu_device *smmu,
+			    struct iommu_ops *ops, phys_addr_t ioaddr)
+{
+	int ret;
+	struct device *dev = smmu->dev;
+
+	ret = iommu_device_sysfs_add(&smmu->iommu, dev, NULL,
+				     "smmu3.%pa", &ioaddr);
+	if (ret)
+		return ret;
+
+	ret = iommu_device_register(&smmu->iommu, ops, dev);
+	if (ret) {
+		dev_err(dev, "Failed to register iommu\n");
+		iommu_device_sysfs_remove(&smmu->iommu);
+		return ret;
+	}
+
+	return 0;
+}
+
+void arm_smmu_unregister_iommu(struct arm_smmu_device *smmu)
+{
+	iommu_device_unregister(&smmu->iommu);
+	iommu_device_sysfs_remove(&smmu->iommu);
+}
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 91f64416900b..bcefa361f3d3 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -3980,27 +3980,14 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
 		return ret;
 
 	/* And we're up. Go go go! */
-	ret = iommu_device_sysfs_add(&smmu->iommu, dev, NULL,
-				     "smmu3.%pa", &ioaddr);
-	if (ret)
-		return ret;
-
-	ret = iommu_device_register(&smmu->iommu, &arm_smmu_ops, dev);
-	if (ret) {
-		dev_err(dev, "Failed to register iommu\n");
-		iommu_device_sysfs_remove(&smmu->iommu);
-		return ret;
-	}
-
-	return 0;
+	return arm_smmu_register_iommu(smmu, &arm_smmu_ops, ioaddr);
 }
 
 static void arm_smmu_device_remove(struct platform_device *pdev)
 {
 	struct arm_smmu_device *smmu = platform_get_drvdata(pdev);
 
-	iommu_device_unregister(&smmu->iommu);
-	iommu_device_sysfs_remove(&smmu->iommu);
+	arm_smmu_unregister_iommu(smmu);
 	arm_smmu_device_disable(smmu);
 	iopf_queue_free(smmu->evtq.iopf);
 	ida_destroy(&smmu->vmid_map);
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 2d658f15973a..63545fdf55f9 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -349,6 +349,10 @@ void arm_smmu_write_strtab_l1_desc(struct arm_smmu_strtab_l1 *dst,
 				   dma_addr_t l2ptr_dma);
 void arm_smmu_write_strtab(struct arm_smmu_device *smmu);
 
+int arm_smmu_register_iommu(struct arm_smmu_device *smmu,
+			    struct iommu_ops *ops, phys_addr_t ioaddr);
+void arm_smmu_unregister_iommu(struct arm_smmu_device *smmu);
+
 void arm_smmu_tlb_inv_asid(struct arm_smmu_device *smmu, u16 asid);
 void arm_smmu_tlb_inv_range_asid(unsigned long iova, size_t size, int asid,
 				 size_t granule, bool leaf,
-- 
2.47.0.338.g60cca15819-goog