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e552b7be12
If the kernel exposes a new perf_event_attr field in a format attr, perf will return an error stating the specified PMU can't be found. For example, a format attr with 'config3:0-63' causes an error as config3 is unknown to perf. This causes a compatibility issue between a newer kernel with older perf tool. Before this change with a kernel adding 'config3' I get: $ perf record -e arm_spe// -- true event syntax error: 'arm_spe//' \___ Cannot find PMU `arm_spe'. Missing kernel support? Run 'perf list' for a list of valid events Usage: perf record [<options>] [<command>] or: perf record [<options>] -- <command> [<options>] -e, --event <event> event selector. use 'perf list' to list available events After this change, I get: $ perf record -e arm_spe// -- true WARNING: 'arm_spe_0' format 'inv_event_filter' requires 'perf_event_attr::config3' which is not supported by this version of perf! [ perf record: Woken up 2 times to write data ] [ perf record: Captured and wrote 0.091 MB perf.data ] To support unknown configN formats, rework the YACC implementation to pass any config[0-9]+ format to perf_pmu__new_format() to handle with a warning. Reviewed-by: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Rob Herring <robh@kernel.org> Tested-by: Leo Yan <leo.yan@linaro.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Clark <james.clark@arm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20220914-arm-perf-tool-spe1-2-v2-v4-1-83c098e6212e@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
42 lines
507 B
Plaintext
42 lines
507 B
Plaintext
%option prefix="perf_pmu_"
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%{
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#include <stdlib.h>
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#include <linux/bitops.h>
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#include "pmu.h"
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#include "pmu-bison.h"
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static int value(int base)
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{
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long num;
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errno = 0;
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num = strtoul(perf_pmu_text, NULL, base);
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if (errno)
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return PP_ERROR;
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perf_pmu_lval.num = num;
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return PP_VALUE;
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}
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%}
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num_dec [0-9]+
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%%
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{num_dec} { return value(10); }
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config { return PP_CONFIG; }
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- { return '-'; }
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: { return ':'; }
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, { return ','; }
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. { ; }
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\n { ; }
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%%
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int perf_pmu_wrap(void)
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{
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return 1;
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}
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