Messages in this thread Patch in this message | | | From | Suravee Suthikulpanit <> | Subject | [PATCH 3/6] iommu/amd: Introduce amd_iommu_get_num_iommus() | Date | Tue, 22 Dec 2015 13:19:14 -0600 |
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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> --- drivers/iommu/amd_iommu_init.c | 16 ++++++++++++++++ include/linux/perf/perf_event_amd_iommu.h | 2 ++ 2 files changed, 18 insertions(+)
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index 275c0f5..9c62613 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -2244,6 +2244,22 @@ bool amd_iommu_v2_supported(void) } EXPORT_SYMBOL(amd_iommu_v2_supported); +static int amd_iommu_cnt; + +int amd_iommu_get_num_iommus(void) +{ + struct amd_iommu *iommu; + + if (amd_iommu_cnt) + return amd_iommu_cnt; + + for_each_iommu(iommu) + amd_iommu_cnt++; + + return amd_iommu_cnt; +} +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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