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perf intel-pt: Fix error with config term "pt=0"
[ Upstream commit 1c6f709b9f
]
Users should never use 'pt=0', but if they do it may give a meaningless
error:
$ perf record -e intel_pt/pt=0/u uname
Error:
The sys_perf_event_open() syscall returned with 22 (Invalid argument) for
event (intel_pt/pt=0/u).
Fix that by forcing 'pt=1'.
Committer testing:
# perf record -e intel_pt/pt=0/u uname
Error:
The sys_perf_event_open() syscall returned with 22 (Invalid argument) for event (intel_pt/pt=0/u).
/bin/dmesg | grep -i perf may provide additional information.
# perf record -e intel_pt/pt=0/u uname
pt=0 doesn't make sense, forcing pt=1
Linux
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.020 MB perf.data ]
#
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/b7c5b4e5-9497-10e5-fd43-5f3e4a0fe51d@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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1 changed files with 11 additions and 0 deletions
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@ -524,10 +524,21 @@ static int intel_pt_validate_config(struct perf_pmu *intel_pt_pmu,
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struct perf_evsel *evsel)
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{
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int err;
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char c;
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if (!evsel)
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return 0;
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/*
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* If supported, force pass-through config term (pt=1) even if user
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* sets pt=0, which avoids senseless kernel errors.
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*/
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if (perf_pmu__scan_file(intel_pt_pmu, "format/pt", "%c", &c) == 1 &&
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!(evsel->attr.config & 1)) {
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pr_warning("pt=0 doesn't make sense, forcing pt=1\n");
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evsel->attr.config |= 1;
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}
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err = intel_pt_val_config_term(intel_pt_pmu, "caps/cycle_thresholds",
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"cyc_thresh", "caps/psb_cyc",
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evsel->attr.config);
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