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Subject[PATCH V4 3/6] iommu/amd: Introduce amd_iommu_get_num_iommus()
Date
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.Suthikulpanit@amd.com>
---
arch/x86/include/asm/perf/amd/iommu.h | 2 ++
drivers/iommu/amd_iommu_init.c | 7 ++++++-
2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/perf/amd/iommu.h b/arch/x86/include/asm/perf/amd/iommu.h
index 97e1be5..40919eb 100644
--- a/arch/x86/include/asm/perf/amd/iommu.h
+++ b/arch/x86/include/asm/perf/amd/iommu.h
@@ -25,6 +25,8 @@
#define PC_MAX_SPEC_CNTRS 16

/* amd_iommu_init.c external support functions */
+int amd_iommu_get_num_iommus(void);
+
bool amd_iommu_pc_supported(void);

u8 amd_iommu_pc_get_max_banks(void);
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index a62b5ce..ffa057e 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 +2244,11 @@ bool amd_iommu_v2_supported(void)
}
EXPORT_SYMBOL(amd_iommu_v2_supported);

+int amd_iommu_get_num_iommus(void)
+{
+ return amd_iommus_present;
+}
+
/****************************************************************************
*
* IOMMU EFR Performance Counter support functionality. This code allows
--
2.5.0
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