Commit 1d9029d4 authored Apr 10, 2017 by Lorenzo Pieralisi Committed by Joerg Roedel Apr 20, 2017

ACPI/IORT: Add function to check SMMUs drivers presence



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 <hanjun.guo@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Cc: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

parent 3f186677

drivers/acpi/arm64/iort.c

+13 −0

Original line number	Diff line number	Diff line
		@@ -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) {
		case ACPI_IORT_NODE_SMMU_V3:
		return IS_BUILTIN(CONFIG_ARM_SMMU_V3);
		case ACPI_IORT_NODE_SMMU:
		return IS_BUILTIN(CONFIG_ARM_SMMU);
		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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