Re: [PATCH v8 0/3] perf: cs-etm: Update perf to handle new Coresight Trace ID

[Suzuki K Poulose]

Arnaldo,

On 29/03/2023 12:14, Mike Leach wrote:
> The original method for allocating trace source ID values to sources was
> to use a fixed algorithm for CPU based sources of (cpu_num * 2 + 0x10).
> The STM was allocated ID 0x1.
>
> This mechanism is broken for systems with more than 47 cores.
>
> The kernel related patches the provide a fixed Trace ID allocation mechanism
> are now upstreamed.
>
> This patchset updates the perf code to handle the changes to the trace ID
> notification mechanism that now uses the PERF_RECORD_AUX_OUTPUT_HW_ID
> packet to set Trace ID in the perf ETM decoders.
>
> Applies to perf/core
>
> Changes since v7:
> Split from original patchset [1] to be sent separately as kernel related
> patches are now upstream.

Please could you pull this in ? This is critical for enabling the 
CoreSight perf support on systems with > 47 cores. The kernel changes
are already in.

Suzuki


> [1] https://lore.kernel.org/linux-arm-kernel/20230116124928.5440-1-mike.leach@xxxxxxxxxx/
>
> Mike Leach (3):
>    perf: cs-etm: Move mapping of Trace ID and cpu into helper function
>    perf: cs-etm: Update record event to use new Trace ID protocol
>    perf: cs-etm: Handle PERF_RECORD_AUX_OUTPUT_HW_ID packet
>
>   tools/include/linux/coresight-pmu.h           |  47 ++-
>   tools/perf/arch/arm/util/cs-etm.c             |  21 +-
>   .../perf/util/cs-etm-decoder/cs-etm-decoder.c |   7 +
>   tools/perf/util/cs-etm.c                      | 326 +++++++++++++++---
>   tools/perf/util/cs-etm.h                      |  14 +-
>   5 files changed, 350 insertions(+), 65 deletions(-)