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

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Message-ID: <0ada81b0-42d7-a9fe-41ff-9476b4b68ee0@arm.com>
Date:   Wed, 29 Mar 2023 12:18:27 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     Mike Leach <mike.leach@...aro.org>,
        linux-perf-users@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, coresight@...ts.linaro.org,
        linux-kernel@...r.kernel.org, acme@...nel.org
Cc:     leo.yan@...aro.org, peterz@...radead.org, mingo@...hat.com,
        will@...nel.org, john.garry@...wei.com, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, gankulkarni@...amperecomputing.com,
        darren@...amperecomputing.com
Subject: Re: [PATCH v8 0/3] perf: cs-etm: Update perf to handle new Coresight
 Trace ID

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@linaro.org/
> 
> 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(-)
>