| Message ID | 1491301105-5274-6-git-send-email-sricharan@codeaurora.org (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On 04/04/17 11:18, Sricharan R wrote: > From: Lorenzo Pieralisi <lorenzo.pieralisi@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. Ah, if only DT could be this neat and tidy :D Reviewed-by: Robin Murphy <robin.murphy@arm.com> > Tested-by: Hanjun Guo <hanjun.guo@linaro.org> > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> > Cc: Robin Murphy <robin.murphy@arm.com> > Cc: Sricharan R <sricharan@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) >
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)