linux-kernel - [PATCH 1/2] perf tools riscv: Allow get

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Date:   Tue, 16 May 2023 10:37:13 +0800
From:   Inochi Amaoto <inochiama@...look.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Nikita Shubin <n.shubin@...ro.com>
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        linux-riscv@...ts.infradead.org,
        Inochi Amaoto <inochiama@...look.com>
Subject: [PATCH 1/2] perf tools riscv: Allow get_cpuid return empty MARCH and MIMP

The T-HEAD C9xx series CPU only has MVENDOR defined, and left MARCH
and MIMP unimplemented.

To make perf support T-HEAD C9xx events. remove the restriction of
the MARCH and MIMP.

Signed-off-by: Inochi Amaoto <inochiama@...look.com>
---
 tools/perf/arch/riscv/util/header.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/tools/perf/arch/riscv/util/header.c b/tools/perf/arch/riscv/util/header.c
index 4a41856938a8..031899c627f6 100644
--- a/tools/perf/arch/riscv/util/header.c
+++ b/tools/perf/arch/riscv/util/header.c
@@ -55,18 +55,13 @@ static char *_get_cpuid(void)
 				goto free;
 		} else if (!strncmp(line, CPUINFO_MARCH, strlen(CPUINFO_MARCH))) {
 			marchid = _get_field(line);
-			if (!marchid)
-				goto free;
 		} else if (!strncmp(line, CPUINFO_MIMP, strlen(CPUINFO_MIMP))) {
 			mimpid = _get_field(line);
-			if (!mimpid)
-				goto free;
-
 			break;
 		}
 	}
 
-	if (!mvendorid || !marchid || !mimpid)
+	if (!mvendorid)
 		goto free;
 
 	if (asprintf(&cpuid, "%s-%s-%s", mvendorid, marchid, mimpid) < 0)
-- 
2.40.1