Messages in this thread Patch in this message | | | From | Lorenzo Pieralisi <> | Subject | [RFC PATCH 07/11] drivers: iommu: arm-smmu: allow ACPI based streamid translation | Date | Thu, 14 Apr 2016 18:25:39 +0100 |
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The ACPI IORT table provides data to ARM IOMMU drivers to carry out streamid mappings and the kernel has the infrastructure to implement it through the fw_xlate() struct iommu_ops hook.
By relying on the DT agnostic struct iommu_fwspec fields, this patch adds code in the ARM SMMU fw_xlate() callback that allows streamid translation on ACPI based ARM system.
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Robin Murphy <robin.murphy@arm.com> --- drivers/iommu/arm-smmu.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index 84bcff7..0f1e784 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -1440,6 +1440,20 @@ out_unlock: return ret; } +static int arm_smmu_dev_node_match(struct device *dev, void *data) +{ + return is_fwnode_iommu(dev->fwnode) && dev->fwnode == data; +} + +static struct platform_device *arm_smmu_get_dev(struct fwnode_handle *fwnode) +{ + struct device *dev; + + dev = bus_find_device(&platform_bus_type, NULL, fwnode, + arm_smmu_dev_node_match); + return dev ? to_platform_device(dev) : NULL; +} + static int arm_smmu_fw_xlate(struct device *dev, struct iommu_fwspec *args) { struct arm_smmu_device *smmu; @@ -1447,6 +1461,8 @@ static int arm_smmu_fw_xlate(struct device *dev, struct iommu_fwspec *args) if (is_of_node(args->fwnode)) smmu_pdev = of_find_device_by_node(to_of_node(args->fwnode)); + else if (is_fwnode_iommu(args->fwnode)) + smmu_pdev = arm_smmu_get_dev(args->fwnode); if (!smmu_pdev) return -ENODEV; -- 2.6.4
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