IOMMU advertises feature via Extended Features Register (EFR).
The helper function checks if the specified feature bit is set
across all IOMMUs.
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpa...@amd.com>
---
drivers/iommu/amd/init.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 46280e6e1535..c97961451ac5 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -298,6 +298,19 @@ int amd_iommu_get_num_iommus(void)
return amd_iommus_present;
}
+static bool check_feature_on_all_iommus(u64 mask)
+{
+ bool ret = false;
+ struct amd_iommu *iommu;
+
+ for_each_iommu(iommu) {
+ ret = iommu_feature(iommu, mask);
+ if (!ret)
+ return false;
+ }
+
+ return true;
+}
/*
* For IVHD type 0x11/0x40, EFR is also available via IVHD.
* Default to IVHD EFR since it is available sooner
--
2.17.1
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