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Subject[RFC 07/11] iommu: Use IOMMU_DOMAIN_MIXED typed domain when IOMMU translates MSI
Date
If the IOMMU advertises IOMMU_CAP_TRANSLATE_MSI choose
IOMMU_DOMAIN_MIXED domain type instead of IOMMU_DOMAIN_UNMANAGED
to allow transparent allocation of MSI frame IOVAs.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
drivers/iommu/iommu.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 617cb2b..8b4b90c 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1069,7 +1069,10 @@ static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,

struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
{
- return __iommu_domain_alloc(bus, IOMMU_DOMAIN_UNMANAGED);
+ if (bus->iommu_ops->capable(IOMMU_CAP_TRANSLATE_MSI))
+ return __iommu_domain_alloc(bus, IOMMU_DOMAIN_MIXED);
+ else
+ return __iommu_domain_alloc(bus, IOMMU_DOMAIN_UNMANAGED);
}
EXPORT_SYMBOL_GPL(iommu_domain_alloc);

--
1.9.1
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