This patch introduces amd_iommu_get_num_iommus(). Initially, this is
intended to be used by Perf AMD IOMMU driver.
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpa...@amd.com>
---
drivers/iommu/amd_iommu_init.c | 8 +++++++-
include/linux/perf/perf_event_amd_iommu.h | 2 ++
2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 275c0f5..33dbf3f 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -1030,7 +1030,7 @@ static int __init init_iommu_one(struct amd_iommu *iommu,
struct ivhd_header *h)
/* Add IOMMU to internal data structures */
list_add_tail(&iommu->list, &amd_iommu_list);
- iommu->index = amd_iommus_present++;
+ iommu->index = amd_iommus_present++;
if (unlikely(iommu->index >= MAX_IOMMUS)) {
WARN(1, "AMD-Vi: System has more IOMMUs than supported by this
driver\n");
@@ -2244,6 +2244,12 @@ bool amd_iommu_v2_supported(void)
}
EXPORT_SYMBOL(amd_iommu_v2_supported);
+int amd_iommu_get_num_iommus(void)
+{
+ return amd_iommus_present;
+}
+EXPORT_SYMBOL(amd_iommu_get_num_iommus);
+
/****************************************************************************
*
* IOMMU EFR Performance Counter support functionality. This code allows
diff --git a/include/linux/perf/perf_event_amd_iommu.h
b/include/linux/perf/perf_event_amd_iommu.h
index 815eabb..cb820c2 100644
--- a/include/linux/perf/perf_event_amd_iommu.h
+++ b/include/linux/perf/perf_event_amd_iommu.h
@@ -25,6 +25,8 @@
#define PC_MAX_SPEC_CNTRS 16
/* amd_iommu_init.c external support functions */
+extern int amd_iommu_get_num_iommus(void);
+
extern bool amd_iommu_pc_supported(void);
extern u8 amd_iommu_pc_get_max_banks(void);
--
1.9.1
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