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| author | Mike Leach <mike.leach@linaro.org> | 2023-01-16 15:49:14 +0300 |
|---|---|---|
| committer | Suzuki K Poulose <suzuki.poulose@arm.com> | 2023-01-19 13:16:46 +0300 |
| commit | 338a588e9db3c5ea7a35bb332cb3bdb532fd1f08 (patch) | |
| tree | 2fd20657d99c0259094533840ee49082b75c568c /drivers/hwtracing/coresight/Makefile | |
| parent | 3f3047493b4dc68165505f22cce1af6cc4d36643 (diff) | |
| download | linux-338a588e9db3c5ea7a35bb332cb3bdb532fd1f08.tar.xz | |
coresight: trace-id: Add API to dynamically assign Trace ID values
The existing mechanism to assign Trace ID values to sources is limited
and does not scale for larger multicore / multi trace source systems.
The API introduces functions that reserve IDs based on availabilty
represented by a coresight_trace_id_map structure. This records the
used and free IDs in a bitmap.
CPU bound sources such as ETMs use the coresight_trace_id_get_cpu_id
coresight_trace_id_put_cpu_id pair of functions. The API will record
the ID associated with the CPU. This ensures that the same ID will be
re-used while perf events are active on the CPU. The put_cpu_id function
will pend release of the ID until all perf cs_etm sessions are complete.
For backward compatibility the functions will attempt to use the same
CPU IDs as the legacy system would have used if these are still available.
Non-cpu sources, such as the STM can use coresight_trace_id_get_system_id /
coresight_trace_id_put_system_id.
Signed-off-by: Mike Leach <mike.leach@linaro.org>
[ Fix checkpatch warning in drivers/hwtracing/coresight/coresight-trace-id.c ]
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20230116124928.5440-2-mike.leach@linaro.org
Diffstat (limited to 'drivers/hwtracing/coresight/Makefile')
| -rw-r--r-- | drivers/hwtracing/coresight/Makefile | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile index 344dba8d6ff8..80f99d915bc9 100644 --- a/drivers/hwtracing/coresight/Makefile +++ b/drivers/hwtracing/coresight/Makefile @@ -6,7 +6,7 @@ obj-$(CONFIG_CORESIGHT) += coresight.o coresight-y := coresight-core.o coresight-etm-perf.o coresight-platform.o \ coresight-sysfs.o coresight-syscfg.o coresight-config.o \ coresight-cfg-preload.o coresight-cfg-afdo.o \ - coresight-syscfg-configfs.o + coresight-syscfg-configfs.o coresight-trace-id.o obj-$(CONFIG_CORESIGHT_LINK_AND_SINK_TMC) += coresight-tmc.o coresight-tmc-y := coresight-tmc-core.o coresight-tmc-etf.o \ coresight-tmc-etr.o |