Re: [PATCH V10 05/12] ACPI/IORT: Add function to check SMMUs drivers presence

[Robin Murphy]

On 04/04/17 11:18, Sricharan R wrote:
> From: Lorenzo Pieralisi 
> 
> 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 

> Tested-by: Hanjun Guo 
> Signed-off-by: Lorenzo Pieralisi 
> Cc: Robin Murphy 
> Cc: Sricharan R 
> ---
>  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)
> 

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[PATCH V10 05/12] ACPI/IORT: Add function to check SMMUs drivers presence

[Sricharan R]

From: Lorenzo Pieralisi 

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 
Signed-off-by: Lorenzo Pieralisi 
Cc: Robin Murphy 
Cc: Sricharan R 
---
 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)
-- 
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