[PATCH v13 02/15] iommu/arm-smmu: Initialize the msi geometry

[Eric Auger]

On ARM, MSI write transactions also are translated by the smmu.
Let's report that specificity by setting the iommu_msi_supported
field to true. A valid aperture window will need to be provided.

Signed-off-by: Eric Auger <eric.auger at redhat.com>

---
v12 -> v13:
- reword the commit message

v8 -> v9:
- reword the title and patch description

v7 -> v8:
- use DOMAIN_ATTR_MSI_GEOMETRY

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    | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 15c01c3..f82eec3 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -1382,6 +1382,7 @@ static bool arm_smmu_capable(enum iommu_cap cap)
 static struct iommu_domain *arm_smmu_domain_alloc(unsigned type)
 {
 	struct arm_smmu_domain *smmu_domain;
+	struct iommu_domain_msi_geometry msi_geometry = {0, 0, true};
 
 	if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA)
 		return NULL;
@@ -1400,6 +1401,7 @@ static struct iommu_domain *arm_smmu_domain_alloc(unsigned type)
 		kfree(smmu_domain);
 		return NULL;
 	}
+	smmu_domain->domain.msi_geometry = msi_geometry;
 
 	mutex_init(&smmu_domain->init_mutex);
 	spin_lock_init(&smmu_domain->pgtbl_lock);
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index ac4aab9..97ff1b4 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1002,6 +1002,7 @@ static void arm_smmu_destroy_domain_context(struct iommu_domain *domain)
 static struct iommu_domain *arm_smmu_domain_alloc(unsigned type)
 {
 	struct arm_smmu_domain *smmu_domain;
+	struct iommu_domain_msi_geometry msi_geometry = {0, 0, true};
 
 	if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA)
 		return NULL;
@@ -1020,6 +1021,8 @@ static struct iommu_domain *arm_smmu_domain_alloc(unsigned type)
 		return NULL;
 	}
 
+	smmu_domain->domain.msi_geometry = msi_geometry;
+
 	mutex_init(&smmu_domain->init_mutex);
 	spin_lock_init(&smmu_domain->pgtbl_lock);
 
-- 
1.9.1