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Thu, 29 Oct 2026 21:04:04 -0700 (PDT) Received: from localhost ([2600:1702:7a90:6f9f:8bc4:8aec:108d:7a04]) by smtp.gmail.com with ESMTPSA id 956f58d0204a3-67ba756be52sm296744d50.21.2026.10.29.21.04.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Oct 2026 21:04:03 -0700 (PDT) From: Matt Turner Date: Fri, 30 Oct 2026 00:03:59 -0400 Subject: [PATCH v2 1/5] alpha/perf: pass PERFMON_CMD_LOGGING_ALL to the logging options call X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261030-alpha-profileme-v2-1-c702f1c65272@gmail.com> References: <20261030-alpha-profileme-v2-0-c702f1c65272@gmail.com> In-Reply-To: <20261030-alpha-profileme-v2-0-c702f1c65272@gmail.com> To: Richard Henderson , Magnus Lindholm , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , James Clark Cc: linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Matt Turner X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=2028; i=mattst88@gmail.com; h=from:subject:message-id; bh=449u5jI6TVHJ3jSiAT+AZJsNh6aRV24147OMwgzJp9U=; b=owGbwMvMwCW25rVmCc8sv+mMp9WSGLKeiOtvbdtflBS3ydQ66N+y5L7E2Lz09y/lxdr8D91O0 3HfceZcx0cWBjEuhpliiixx6xVZZrXtWOpzWvoXzBxWJpAh0iINDEDAwsCXm5hXaqRjpGeqbahn CGToGMVD5PQYNDKLi0tTi3TTCooc8vJLEksy8/OK9fILUvMK0gv00jLTSjIy8ouKU4FG6OWllpi 6OroZGRqYWDpamDlZOJqaODs7GTq5OTo6uzoZWZqbGDhbOpq4WpozcHEKwFwzZzkjw+kKhbTSmw s2uuW036rgui17X6V415rb7uen3Dm62P4AYyzD/6R+4TXpou+WF3Tu056/5urh51tussxIfjGnq 1fV5YDoUi4A X-Developer-Key: i=mattst88@gmail.com; a=openpgp; fpr=3BB639E56F861FA2E86505690FDD682D974CA72A alpha_pmu_enable() passes EV67_PCTR_MODE_AGGREGATE to PERFMON_CMD_LOGGING_OPTIONS. That constant is the counting mode bit for PCTR_CTL, which belongs in the PERFMON_CMD_DESIRED_EVENTS argument. The logging options call takes a flag in bit 0 where 0 means "count all processes". It works only because EV67_PCTR_MODE_AGGREGATE happens to be 0. Table E-18 of the Alpha Architecture Reference Manual gives bit 0 the opposite sense, but the PALcode in the ES40 and ES47 firmware agrees with the above: it sets I_CTL[SPCE], which enables counting for all processes, unless bit 0 is set. Linux never sets the PME bit in the PCB, so if 0 meant "selected processes only", nothing would be counted. Add a name for that argument and pass it instead. No functional change. Signed-off-by: Matt Turner --- arch/alpha/include/asm/wrperfmon.h | 2 ++ arch/alpha/kernel/perf_event.c | 2 +- 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/alpha/include/asm/wrperfmon.h b/arch/alpha/include/asm/wrperfmon.h index c97b82a1f7db..1fa9bc813263 100644 --- a/arch/alpha/include/asm/wrperfmon.h +++ b/arch/alpha/include/asm/wrperfmon.h @@ -23,6 +23,8 @@ #define PERFMON_CMD_I_STAT 8 #define PERFMON_CMD_PMPC 9 +/* PERFMON_CMD_LOGGING_OPTIONS arguments */ +#define PERFMON_CMD_LOGGING_ALL 0 /* EV5/EV56/PCA56 Counters */ #define EV5_PCTR_0 (1UL<<0) diff --git a/arch/alpha/kernel/perf_event.c b/arch/alpha/kernel/perf_event.c index a3eaab094ece..2d9383425357 100644 --- a/arch/alpha/kernel/perf_event.c +++ b/arch/alpha/kernel/perf_event.c @@ -728,7 +728,7 @@ static void alpha_pmu_enable(struct pmu *pmu) maybe_change_configuration(cpuc); /* Start counting the desired events. */ - wrperfmon(PERFMON_CMD_LOGGING_OPTIONS, EV67_PCTR_MODE_AGGREGATE); + wrperfmon(PERFMON_CMD_LOGGING_OPTIONS, PERFMON_CMD_LOGGING_ALL); wrperfmon(PERFMON_CMD_DESIRED_EVENTS, cpuc->config); wrperfmon(PERFMON_CMD_ENABLE, cpuc->idx_mask); } -- 2.55.0