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| author | German Gomez <german.gomez@arm.com> | 2022-08-23 17:06:50 +0100 |
|---|---|---|
| committer | Mathieu Poirier <mathieu.poirier@linaro.org> | 2022-08-26 13:38:35 -0600 |
| commit | 04d1edb0ecf297eba4fe946b3b715cff4f8a6656 (patch) | |
| tree | 59a83a5304be9f58f7f4cce41fb2c20ec081a8cd | |
| parent | 0f00b223ea22f9e32a82a6ffb5a4de0753c99b55 (diff) | |
| download | linux-04d1edb0ecf297eba4fe946b3b715cff4f8a6656.tar.gz | |
coresight: etm4x: docs: Add documentation for 'ts_source' sysfs interface
Sync sysfs documentation pages to include the new ts_source (timestamp
source) interface.
Signed-off-by: German Gomez <german.gomez@arm.com>
Signed-off-by: James Clark <james.clark@arm.com>
Link: https://lore.kernel.org/r/20220823160650.455823-3-james.clark@arm.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x | 8 | ||||
| -rw-r--r-- | Documentation/trace/coresight/coresight-etm4x-reference.rst | 14 |
2 files changed, 22 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x b/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x index 8e53a32f8150..08b1964f27d3 100644 --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x @@ -516,3 +516,11 @@ Contact: Mathieu Poirier <mathieu.poirier@linaro.org> Description: (Read) Returns the number of special conditional P1 right-hand keys that the trace unit can use (0x194). The value is taken directly from the HW. + +What: /sys/bus/coresight/devices/etm<N>/ts_source +Date: October 2022 +KernelVersion: 6.1 +Contact: Mathieu Poirier <mathieu.poirier@linaro.org> or Suzuki K Poulose <suzuki.poulose@arm.com> +Description: (Read) When FEAT_TRF is implemented, value of TRFCR_ELx.TS used for + trace session. Otherwise -1 indicates an unknown time source. Check + trcidr0.tssize to see if a global timestamp is available. diff --git a/Documentation/trace/coresight/coresight-etm4x-reference.rst b/Documentation/trace/coresight/coresight-etm4x-reference.rst index fb7578fd9372..70e34b8c81c1 100644 --- a/Documentation/trace/coresight/coresight-etm4x-reference.rst +++ b/Documentation/trace/coresight/coresight-etm4x-reference.rst @@ -71,6 +71,20 @@ the ‘TRC’ prefix. ---- +:File: ``ts_source`` (ro) +:Trace Registers: None. +:Notes: + When FEAT_TRF is implemented, value of TRFCR_ELx.TS used for trace session. Otherwise -1 + indicates an unknown time source. Check trcidr0.tssize to see if a global timestamp is + available. + +:Example: + ``$> cat ts_source`` + + ``$> 1`` + +---- + :File: ``addr_idx`` (rw) :Trace Registers: None. :Notes: |