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Tue, 03 Nov 2026 12:37:38 -0800 (PST) Received: from localhost ([2600:1702:7a90:6f9f:8bc4:8aec:108d:7a04]) by smtp.gmail.com with ESMTPSA id 00721157ae682-8b309bd1672sm4539577b3.43.2026.11.03.12.37.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Nov 2026 12:37:37 -0800 (PST) From: Matt Turner Date: Tue, 03 Nov 2026 15:37:34 -0500 Subject: [PATCH v5 01/11] 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: <20261103-alpha-profileme-v5-1-bbe3937fbf3a@gmail.com> References: <20261103-alpha-profileme-v5-0-bbe3937fbf3a@gmail.com> In-Reply-To: <20261103-alpha-profileme-v5-0-bbe3937fbf3a@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=2126; i=mattst88@gmail.com; h=from:subject:message-id; bh=IGfq8dWu2iMEFoz3MC34tYu6sOJyy2DqaUpgqZ45fio=; b=owGbwMvMwCW25rVmCc8sv+mMp9WSGLJeufEtDZiVNCO80aFT6zGzWkp0iursVqYlvAfcGAW+9 b9m+SDU8ZGFQYyLYaaYIkvcekWWWW07lvqclv4FM4eVCWSItEgDAxCwMPDlJuaVGukY6ZlqG+oZ Ahk6RvEQOT0Gjczi4tLUIt20giKHvPySxJLM/LxivfyC1LyC9AK9tMy0koyM/KLiVKARenmpJaa ujm5GhgYmlo4WZk4WjqYmzs5Ohk5ujo7Ork5GluYmBs6WjiauluYMXJwCMNf8nsbwV6iH6cYXXr Oi8HwXt+c3+TLlLiUs2JKqseVSHf9kt/3M3xn++776HK9v/jnu+uSAM2/mrD7nNqP0p6zznbLND Te2SZmlsQEA 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 Reviewed-by: Magnus Lindholm Tested-by: Magnus Lindholm --- 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