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| author |   Anshuman Khandual <anshuman.khandual@arm.com> | 2022-08-24 10:18:17 +0530 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2022-08-29 09:42:42 +0200 |
| commit | 5402d25aa5710d240040f73fb13d7d5c303ef071 (patch) | |
| tree | cb99d6c083c1052b71a2fd3ae668b5e9286db6a7 | |
| parent | perf: Extend branch type classification (diff) | |
| download | linux-dev-5402d25aa5710d240040f73fb13d7d5c303ef071.tar.xz linux-dev-5402d25aa5710d240040f73fb13d7d5c303ef071.zip | |
perf: Capture branch privilege information
Platforms like arm64 could capture privilege level information for all the
branch records. Hence this adds a new element in the struct branch_entry to
record the privilege level information, which could be requested through a
new event.attr.branch_sample_type based flag PERF_SAMPLE_BRANCH_PRIV_SAVE.
This flag helps user choose whether privilege information is captured.
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: James Clark <james.clark@arm.com>
Link: https://lkml.kernel.org/r/20220824044822.70230-4-anshuman.khandual@arm.com
| -rw-r--r-- | include/uapi/linux/perf_event.h | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h index fed60e6b10e5..1a258d45a3fa 100644 --- a/include/uapi/linux/perf_event.h +++ b/include/uapi/linux/perf_event.h @@ -204,6 +204,8 @@ enum perf_branch_sample_type_shift { PERF_SAMPLE_BRANCH_HW_INDEX_SHIFT = 17, /* save low level index of raw branch records */ + PERF_SAMPLE_BRANCH_PRIV_SAVE_SHIFT = 18, /* save privilege mode */ + PERF_SAMPLE_BRANCH_MAX_SHIFT /* non-ABI */ }; @@ -233,6 +235,8 @@ enum perf_branch_sample_type { PERF_SAMPLE_BRANCH_HW_INDEX = 1U << PERF_SAMPLE_BRANCH_HW_INDEX_SHIFT, + PERF_SAMPLE_BRANCH_PRIV_SAVE = 1U << PERF_SAMPLE_BRANCH_PRIV_SAVE_SHIFT, + PERF_SAMPLE_BRANCH_MAX = 1U << PERF_SAMPLE_BRANCH_MAX_SHIFT, }; @@ -282,6 +286,13 @@ enum { PERF_BR_NEW_MAX, }; +enum { + PERF_BR_PRIV_UNKNOWN = 0, + PERF_BR_PRIV_USER = 1, + PERF_BR_PRIV_KERNEL = 2, + PERF_BR_PRIV_HV = 3, +}; + #define PERF_SAMPLE_BRANCH_PLM_ALL \ (PERF_SAMPLE_BRANCH_USER|\ PERF_SAMPLE_BRANCH_KERNEL|\ @@ -1402,7 +1413,8 @@ struct perf_branch_entry { type:4, /* branch type */ spec:2, /* branch speculation info */ new_type:4, /* additional branch type */ - reserved:34; + priv:3, /* privilege level */ + reserved:31; }; union perf_sample_weight { |