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 (file)
--- 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 @@ bool amd_iommu_iotlb_sup __read_mostly = true;
 
 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 @@ static void __init init_iommu_from_pci(struct amd_iommu *iommu)
                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 @@ IOMMU_INIT_FINISH(amd_iommu_detect,
                  gart_iommu_hole_init,
                  0,
                  0);
+
+bool amd_iommu_v2_supported(void)
+{
+       return amd_iommu_v2_present;
+}
+EXPORT_SYMBOL(amd_iommu_v2_supported);

diff --git a/drivers/iommu/amd_iommu_proto.h b/drivers/iommu/amd_iommu_proto.h
index 7ffaa64..3a46c30 100644 (file)
--- a/drivers/iommu/amd_iommu_proto.h
+++ b/drivers/iommu/amd_iommu_proto.h
@@ -31,6 +31,9 @@ extern int amd_iommu_init_devices(void);
 extern void amd_iommu_uninit_devices(void);
 extern void amd_iommu_init_notifier(void);
 extern void amd_iommu_init_api(void);
+
+extern bool amd_iommu_v2_supported(void);
+
 #ifndef CONFIG_AMD_IOMMU_STATS
 
 static inline void amd_iommu_stats_init(void) { }

diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index a6e1dc6..7e81094 100644 (file)
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -414,6 +414,9 @@ struct amd_iommu {
        /* Extended features */
        u64 features;
 
+       /* IOMMUv2 */
+       bool is_iommu_v2;
+
        /*
         * Capability pointer. There could be more than one IOMMU per PCI
         * device function if there are more than one AMD IOMMU capability
@@ -570,6 +573,8 @@ extern bool amd_iommu_unmap_flush;
 /* Smallest number of PASIDs supported by any IOMMU in the system */
 extern u32 amd_iommu_max_pasids;
 
+extern bool amd_iommu_v2_present;
+
 /* takes bus and device/function and returns the device id
  * FIXME: should that be in generic PCI code? */
 static inline u16 calc_devid(u8 bus, u8 devfn)