linux-kernel - [RFC v5 02/17] iommu/arm-smmu: advertise DOMAIN_ATTR_MSI

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Date:	Tue,  1 Mar 2016 18:27:42 +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
Subject: [RFC v5 02/17] 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 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