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authorLorenzo Pieralisi <lorenzo.pieralisi@arm.com>2017-04-10 16:50:59 +0530
committerJoerg Roedel <jroedel@suse.de>2017-04-20 16:31:06 +0200
commit1d9029d440e40b276c0691caed1de10c42d96bef (patch)
tree33b6bdb0a549f369d0288fea4e250983f3d749c8 /drivers/acpi
parent3f1866779cf8338e1c8bd32e5f6f5424795ef191 (diff)
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>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/arm64/iort.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 4a5bb967250b..3dd9ec372dae 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)