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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: 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>
This commit is contained in:
Lorenzo Pieralisi 2017-04-10 16:50:59 +05:30 committed by Joerg Roedel
parent 3f1866779c
commit 1d9029d440
1 changed files with 13 additions and 0 deletions
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13
drivers/acpi/arm64/iort.c
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@ -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)