iommu/amd: Add iommuv2 flag to struct amd_iommu
In mixed IOMMU setups this flag inidicates whether an IOMMU
supports the v2 features or not. This patch also adds a
global flag together with a function to query that flag from
other code. The flag shows if at least one IOMMUv2 is in the
system.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 2c25ae3..d1e5067 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -25,6 +25,7 @@
#include <linux/interrupt.h>
#include <linux/msi.h>
#include <linux/amd-iommu.h>
+#include <linux/export.h>
#include <asm/pci-direct.h>
#include <asm/iommu.h>
#include <asm/gart.h>
@@ -143,6 +144,8 @@
u32 amd_iommu_max_pasids __read_mostly = ~0;
+bool amd_iommu_v2_present __read_mostly;
+
/*
* The ACPI table parsing functions set this variable on an error
*/
@@ -760,6 +763,12 @@
amd_iommu_max_pasids = min(amd_iommu_max_pasids, pasids);
}
+ if (iommu_feature(iommu, FEATURE_GT) &&
+ iommu_feature(iommu, FEATURE_PPR)) {
+ iommu->is_iommu_v2 = true;
+ amd_iommu_v2_present = true;
+ }
+
if (!is_rd890_iommu(iommu->dev))
return;
@@ -1645,3 +1654,9 @@
gart_iommu_hole_init,
0,
0);
+
+bool amd_iommu_v2_supported(void)
+{
+ return amd_iommu_v2_present;
+}
+EXPORT_SYMBOL(amd_iommu_v2_supported);