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SubjectRe: [PATCH v2 2/9] perf cs-etm: Initialise architecture based on TRCIDR1
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On 06/08/2021 14:41, James Clark wrote:
> Currently the architecture is hard coded as ARCH_V8, but from ETMv4.4
> onwards this should be ARCH_AA64.
>
> Signed-off-by: James Clark <james.clark@arm.com>
> ---
> tools/perf/util/cs-etm-decoder/cs-etm-decoder.c | 16 +++++++++++++++-
> 1 file changed, 15 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
> index 187c038caa19..787b19642e78 100644
> --- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
> +++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
> @@ -126,6 +126,20 @@ static int cs_etm_decoder__gen_etmv3_config(struct cs_etm_trace_params *params,
> return 0;
> }
>
> +#define TRCIDR1_TRCARCHMIN_SHIFT 4
> +#define TRCIDR1_TRCARCHMIN_MASK GENMASK(7, 4)
> +#define TRCIDR1_TRCARCHMIN(x) (((x) & TRCIDR1_TRCARCHMIN_MASK) >> TRCIDR1_TRCARCHMIN_SHIFT)

minor nit: Please add a blank line here

> +static enum _ocsd_arch_version cs_etm_decoder__get_etmv4_arch_ver(u32 reg_idr1)
> +{
> + /*
> + * For ETMv4 if the trace minor version is 4 or more then we can assume
> + * the architecture is ARCH_AA64 rather than just V8.
> + * ARCH_V8 = V8 architecture
> + * ARCH_AA64 = Min v8r3 plus additional AA64 PE features

Does this need to be >= 3 then, to be accurate ?

The comment "reads", minimum v8.3 and any additional features.

Otherwise looks good to me.

Suzuki

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