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Date:   Tue,  4 Apr 2017 15:48:18 +0530
From:   Sricharan R <>
Subject: [PATCH V10 05/12] ACPI/IORT: Add function to check SMMUs drivers presence

From: Lorenzo Pieralisi <>

The IOMMU probe deferral implementation requires a mechanism to detect
if drivers for SMMU components are built-in in the kernel to detect
whether IOMMU configuration for a given device should be deferred (ie
SMMU drivers present but still not probed) or not (drivers not present).

Add a simple function to IORT to detect if SMMU drivers for SMMU
components managed by IORT are built-in in the kernel.

Tested-by: Hanjun Guo <>
Signed-off-by: Lorenzo Pieralisi <>
Cc: Robin Murphy <>
Cc: Sricharan R <>
 drivers/acpi/arm64/iort.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 4a5bb96..3dd9ec3 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -523,6 +523,19 @@ static int arm_smmu_iort_xlate(struct device *dev, u32 streamid,
 	return ret;
+static inline bool iort_iommu_driver_enabled(u8 type)
+	switch (type) {
+	default:
+		pr_warn("IORT node type %u does not describe an SMMU\n", type);
+		return false;
+	}
 static const struct iommu_ops *iort_iommu_xlate(struct device *dev,
 					struct acpi_iort_node *node,
 					u32 streamid)
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