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Date: Mon, 4 Apr 2016 08:06:57 +0000
From: Eric Auger <eric.auger@...aro.org>
To: eric.auger@...com, eric.auger@...aro.org, robin.murphy@....com,
alex.williamson@...hat.com, will.deacon@....com, joro@...tes.org,
tglx@...utronix.de, jason@...edaemon.net, marc.zyngier@....com,
christoffer.dall@...aro.org, linux-arm-kernel@...ts.infradead.org,
kvmarm@...ts.cs.columbia.edu, kvm@...r.kernel.org
Cc: suravee.suthikulpanit@....com, patches@...aro.org,
linux-kernel@...r.kernel.org, Manish.Jaggi@...iumnetworks.com,
Bharat.Bhushan@...escale.com, pranav.sawargaonkar@...il.com,
p.fedin@...sung.com, iommu@...ts.linux-foundation.org,
Jean-Philippe.Brucker@....com, julien.grall@....com
Subject: [PATCH v6 2/7] iommu/arm-smmu: advertise DOMAIN_ATTR_MSI_MAPPING attribute
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@...aro.org>
Signed-off-by: Bharat Bhushan <Bharat.Bhushan@...escale.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 4ff73ff..a077a35 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -1900,6 +1900,8 @@ 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 5158feb..6562752 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1429,6 +1429,8 @@ 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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