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Message-ID: <1323092077-25501-7-git-send-email-joerg.roedel@amd.com>
Date: Mon, 5 Dec 2011 14:34:21 +0100
From: Joerg Roedel <joerg.roedel@....com>
To: <iommu@...ts.linux-foundation.org>
CC: <linux-kernel@...r.kernel.org>, Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 06/22] 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@....com>
---
drivers/iommu/amd_iommu_init.c | 15 +++++++++++++++
drivers/iommu/amd_iommu_proto.h | 3 +++
drivers/iommu/amd_iommu_types.h | 5 +++++
3 files changed, 23 insertions(+), 0 deletions(-)
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 @@ 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
--- 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 c26a16d..535cd07 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -415,6 +415,9 @@ 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
@@ -571,6 +574,8 @@ 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)
--
1.7.5.4
--
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