From: Lorenzo Pieralisi <lorenzo.pieral...@arm.com>
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....@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieral...@arm.com>
Cc: Robin Murphy <robin.mur...@arm.com>
Cc: Sricharan R <sricha...@codeaurora.org>
---
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) {
+ 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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