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[RFC,v5,02/17] iommu/arm-smmu: advertise DOMAIN_ATTR_MSI_MAPPING attribute

Message ID 1456856877-4817-3-git-send-email-eric.auger@linaro.org (mailing list archive)
State New, archived
Headers show

Commit Message

Eric Auger March 1, 2016, 6:27 p.m. UTC 
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.auger@linaro.org>
Signed-off-by: Bharat Bhushan <Bharat.Bhushan@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(+)
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Patch

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;
 	}