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Wed, 28 Oct 2026 11:09:40 -0700 (PDT) Received: from localhost ([2600:1702:7a90:6f9f:66f3:d5d6:2d12:d460]) by smtp.gmail.com with ESMTPSA id 00721157ae682-8b19e597080sm32648127b3.21.2026.10.28.11.09.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Oct 2026 11:09:39 -0700 (PDT) From: Matt Turner Date: Wed, 28 Oct 2026 14:09:33 -0400 Subject: [PATCH 4/5] alpha/perf: attach ProfileMe status as PERF_SAMPLE_RAW data 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: <20261028-alpha-profileme-v1-4-d44b52bf2500@gmail.com> References: <20261028-alpha-profileme-v1-0-d44b52bf2500@gmail.com> In-Reply-To: <20261028-alpha-profileme-v1-0-d44b52bf2500@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=4143; i=mattst88@gmail.com; h=from:subject:message-id; bh=7lfzYXP8HFajbcWjdtNJAnU6E+tudpSNerQEXfAgV4w=; b=owGbwMvMwCW25rVmCc8sv+mMp9WSGLIeWUXJls1vZWrqeD9f6zXnqkMb2t4s5HNIZUp6cuUgw 1S1Rf6mHR9ZGMS4GGaKKbLErVdkmdW2Y6nPaelfMHNYmUCGSIs0MAABCwNfbmJeqZGOkZ6ptqGe IZChYxQPkdNj0MgsLi5NLdJNKyhyyMsvSSzJzM8r1ssvSM0rSC/QS8tMK8nIyC8qTgUaoZeXWmL q6uhmZGhgYuloYeZk4Whq4uzsZOjk5ujo7OpkZGluYuBs6WjiamnOwMUpAHMNnwnD/2xnr7t+q0 QmNa7T93GWWsD2oovfJdpiv3jcAe2Fa4+8W8Twv2bZzGl262YpXeUpyD757/fFc6dWioRNa9PU+ 7lbRPw3OycA X-Developer-Key: i=mattst88@gmail.com; a=openpgp; fpr=3BB639E56F861FA2E86505690FDD682D974CA72A A ProfileMe sample's PC alone does not say what happened to the profiled instruction. I_STAT and PCTR_CTL do: whether it trapped and why, was mispredicted, stalled, or was killed on a wrong path, and what PCTR1 counted during the window. With PERF_SAMPLE_RAW, attach PMPC, I_STAT and PCTR_CTL to each ProfileMe sample in a versioned struct alpha_profileme_sample. PMPC is included because a PALmode PMPC is not the sample's IP. Killed instructions can be told apart by PM_KILLED_BM and VAL. Signed-off-by: Matt Turner --- arch/alpha/include/asm/perf_event.h | 2 ++ arch/alpha/include/uapi/asm/perf_event.h | 27 +++++++++++++++++++++++++++ arch/alpha/kernel/perf_event.c | 21 +++++++++++++++++++-- 3 files changed, 48 insertions(+), 2 deletions(-) diff --git a/arch/alpha/include/asm/perf_event.h b/arch/alpha/include/asm/perf_event.h index 72536566014a..f498c1d47c07 100644 --- a/arch/alpha/include/asm/perf_event.h +++ b/arch/alpha/include/asm/perf_event.h @@ -1,6 +1,8 @@ #ifndef __ASM_ALPHA_PERF_EVENT_H #define __ASM_ALPHA_PERF_EVENT_H +#include + /* * Software events have no trap frame, so perf_fetch_caller_regs() fills * in a zeroed pt_regs. A zero ps already means kernel mode; only pc is diff --git a/arch/alpha/include/uapi/asm/perf_event.h b/arch/alpha/include/uapi/asm/perf_event.h new file mode 100644 index 000000000000..0cb7d6f3cb15 --- /dev/null +++ b/arch/alpha/include/uapi/asm/perf_event.h @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +#ifndef _UAPI_ASM_ALPHA_PERF_EVENT_H +#define _UAPI_ASM_ALPHA_PERF_EVENT_H + +#include + +/* + * PERF_SAMPLE_RAW payload of a ProfileMe sample from the cpu PMU. + * + * pmpc, i_stat and pctr_ctl are the values of the PMPC, I_STAT and + * PCTR_CTL registers when the ProfileMe window closed. i_stat holds only + * bits 40:30 and pctr_ctl only bits 47:0. See the EV67/EV68 Hardware + * Reference Manuals for the field layout. + * + * Fields may be added to the end in later versions. + */ +#define ALPHA_PROFILEME_SAMPLE_VERSION 1 + +struct alpha_profileme_sample { + __u32 version; + __u32 reserved; + __u64 pmpc; + __u64 i_stat; + __u64 pctr_ctl; +}; + +#endif /* _UAPI_ASM_ALPHA_PERF_EVENT_H */ diff --git a/arch/alpha/kernel/perf_event.c b/arch/alpha/kernel/perf_event.c index 24c96feda942..06c9afeb7c05 100644 --- a/arch/alpha/kernel/perf_event.c +++ b/arch/alpha/kernel/perf_event.c @@ -915,10 +915,13 @@ static void alpha_perf_event_profileme(struct perf_event *event, struct hw_perf_event *hwc, struct pt_regs *regs) { + struct alpha_profileme_sample pm; + struct perf_raw_record raw; struct perf_sample_data data; struct pt_regs pm_regs; - unsigned long i_stat, pmpc, ovr; + unsigned long pctr_ctl, i_stat, pmpc, ovr; + pctr_ctl = wrperfmon(PERFMON_CMD_READ, 0); i_stat = wrperfmon(PERFMON_CMD_I_STAT, 0); pmpc = wrperfmon(PERFMON_CMD_PMPC, 0); @@ -941,7 +944,7 @@ static void alpha_perf_event_profileme(struct perf_event *event, * perf cannot resolve. That happens for ITB miss, Istream access * violation and interrupt redirects, and for instructions inside * PALcode. Keep the interrupted PC, which for redirects is the - * instruction that trapped. + * instruction that trapped, and report the real PMPC in the raw data. */ pm_regs = *regs; if (!(pmpc & EV67_PMPC_PAL)) { @@ -955,6 +958,20 @@ static void alpha_perf_event_profileme(struct perf_event *event, perf_sample_data_init(&data, 0, hwc->last_period); + pm.version = ALPHA_PROFILEME_SAMPLE_VERSION; + pm.reserved = 0; + pm.pmpc = pmpc; + pm.i_stat = i_stat; + /* PALcode sign-extends bit 47 of PCTR_CTL. */ + pm.pctr_ctl = pctr_ctl & GENMASK(47, 0); + raw = (struct perf_raw_record) { + .frag = { + .size = sizeof(pm), + .data = &pm, + }, + }; + perf_sample_save_raw_data(&data, event, &raw); + if (alpha_perf_event_set_period(event, hwc, 0)) perf_event_overflow(event, &data, &pm_regs); } -- 2.55.0