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| author | Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2017-04-10 16:50:59 +0530 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2017-04-20 16:31:06 +0200 |
| commit | 1d9029d440e40b276c0691caed1de10c42d96bef (patch) | |
| tree | 33b6bdb0a549f369d0288fea4e250983f3d749c8 /drivers/acpi/arm64 | |
| parent | 3f1866779cf8338e1c8bd32e5f6f5424795ef191 (diff) | |
| download | lwn-1d9029d440e40b276c0691caed1de10c42d96bef.tar.gz lwn-1d9029d440e40b276c0691caed1de10c42d96bef.zip | |
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/arm64')
| -rw-r--r-- | drivers/acpi/arm64/iort.c | 13 |
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) |