diff options
| author | Mathieu Poirier <mathieu.poirier@linaro.org> | 2016-02-17 17:52:02 -0700 |
|---|---|---|
| committer | Mathieu Poirier <mathieu.poirier@linaro.org> | 2016-06-01 15:31:27 -0600 |
| commit | c8ec21bd630e8a56fa811c6542c466b1bdc565ac (patch) | |
| tree | f9006d629298be5bc8410f3ecc050b4e57c57cf0 /include/linux | |
| parent | fbeb6125a14d179f9431524d8502af63ef7afe10 (diff) | |
coresight: introducing a global trace ID function
TraceID values have to be unique for all tracers and
consistent between drivers and user space. As such
introducing a central function to be used whenever a
traceID value is required.
The patch also account for data traceIDs, which are usually
I(N) + 1.
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 17534ceb835a1a96eb921a2a80df168723d6570a)
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/coresight-pmu.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/coresight-pmu.h b/include/linux/coresight-pmu.h index 6c5386b23b10..7d410260661b 100644 --- a/include/linux/coresight-pmu.h +++ b/include/linux/coresight-pmu.h @@ -19,9 +19,21 @@ #define _LINUX_CORESIGHT_PMU_H #define CORESIGHT_ETM_PMU_NAME "cs_etm" +#define CORESIGHT_ETM_PMU_SEED 0x10 /* ETMv3.5/PTM's ETMCR config bit */ #define ETM_OPT_CYCACC 12 #define ETM_OPT_TS 28 +static inline int coresight_get_trace_id(int cpu) +{ + /* + * A trace ID of value 0 is invalid, so let's start at some + * random value that fits in 7 bits and go from there. Since + * the common convention is to have data trace IDs be I(N) + 1, + * set instruction trace IDs as a function of the CPU number. + */ + return (CORESIGHT_ETM_PMU_SEED + (cpu * 2)); +} + #endif |