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Commit 1d9029d4 authored by Lorenzo Pieralisi's avatar Lorenzo Pieralisi Committed by Joerg Roedel
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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: default avatarHanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: default avatarRobin Murphy <robin.murphy@arm.com>
Cc: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: default avatarJoerg 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)