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@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Robin Murphy <robin.murphy@xxxxxxx>
---
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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