On ARM, MSI write transactions from device upstream to the smmu
are conveyed through the iommu. Therefore target physical addresses
must be mapped and DOMAIN_ATTR_MSI_MAPPING is set to advertise
this requirement on arm-smmu and arm-smmu-v3.
Signed-off-by: Eric Auger <eric.au...@linaro.org>
Signed-off-by: Bharat Bhushan <bharat.bhus...@freescale.com>
---
v4 -> v5:
- don't handle fsl_pamu_domain anymore
- handle arm-smmu-v3
---
drivers/iommu/arm-smmu-v3.c | 2 ++
drivers/iommu/arm-smmu.c | 2 ++
2 files changed, 4 insertions(+)
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 2087534..1d7b506 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -1895,6 +1895,8 @@ static int arm_smmu_domain_get_attr(struct iommu_domain
*domain,
case DOMAIN_ATTR_NESTING:
*(int *)data = (smmu_domain->stage == ARM_SMMU_DOMAIN_NESTED);
return 0;
+ case DOMAIN_ATTR_MSI_MAPPING:
+ return 0;
default:
return -ENODEV;
}
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 59ee4b8..c8b7e71 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1409,6 +1409,8 @@ static int arm_smmu_domain_get_attr(struct iommu_domain
*domain,
case DOMAIN_ATTR_NESTING:
*(int *)data = (smmu_domain->stage == ARM_SMMU_DOMAIN_NESTED);
return 0;
+ case DOMAIN_ATTR_MSI_MAPPING:
+ return 0;
default:
return -ENODEV;
}
--
1.9.1
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