From nobody Sun Feb 8 02:21:59 2026 Received: from mail-yb1-f201.google.com (mail-yb1-f201.google.com [209.85.219.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C352E1DA32 for ; Wed, 21 Feb 2024 16:42:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708533727; cv=none; b=Xe77tcNw5E4RrlsY1HgkG4mgMsMvv0mJmKdmWg1j6SuxF2CFy9h9rZNa80BGKw6U7k+VNN2vhUFAJlo4zvvtIUhYU1rSxkoKpHkMJZGhyDHvrGuJTFKB1DNyl0Km59AYNuH96wz8jLPe1P5F/amlPTBhvUDs5a438n7oNA1HPQ4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708533727; c=relaxed/simple; bh=5QvEqAnoo4+rJMB/03f8vFSvfBFHh/I8MNbKCyj6Q8s=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=lEWcgpMI6iDYHO4htES1cSDIegGCsLdhJf+B8pbb/GuvY5asJ+2OUBlXRAeoEBGwMZhdAlMa8WlLgszlaudE9CIFx5iM3EYebgN41/ieXHZvQyWyJ0/2n9PQv51YeHtVqLhEQZWaQfpyMEkghnjUoMXmr2klVaQnehtkrlW1v3s= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--vilasbhat.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=1GAtX7yd; arc=none smtp.client-ip=209.85.219.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--vilasbhat.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="1GAtX7yd" Received: by mail-yb1-f201.google.com with SMTP id 3f1490d57ef6-dc6b269686aso10555978276.1 for ; Wed, 21 Feb 2024 08:42:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1708533725; x=1709138525; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=KbnKqBJ3sCc2xkK0NDD9vN4I2lfLk3JwJvt5ev19VfU=; b=1GAtX7ydJCksB1JKmRt1pa/tIOc0QF5C9ZHBvQpOh4XSiRgneWacp5bTYCvJ1pHD94 MzCfOEwsp1cok54wdoXCKBz7qhncpApABqogTpoKNIgGZGHlow8cjb7xwQe5LQiUgGm/ JAcx7vI76+TEJtt3dp9YIuP6S5Uj0dWf0IZG0S1STQaaQi/P0XHHHOnNo9plwEemtv+A 2Fo+2USg5aIIJ7xBHSvefR9vnXWlFxk6tDKwXWTZy+e9m9BvdOC4GziOeucv+sprVlFk PbjaKg0IYlOL3GFvfVc94bjVcpghZ6ImEEzWwTUQg86dGaUwMDbKiWcaIwoEJhbSKIPm W3ow== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1708533725; x=1709138525; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=KbnKqBJ3sCc2xkK0NDD9vN4I2lfLk3JwJvt5ev19VfU=; b=HxD5XySdcmypOIdl0TOhfpqFFTG7OcW8y6WAOpE4mmNSQzK/2sFmOavQDCRaKMCeE7 id6//Ai0R6DUQhSl3W302bdgdcpOlowNPyBXBTSKAOhchmtZAnk1ji8MqhjwIABQTcMR HoPbqyDd6seEo43u8B7lerteobxcDp85doyCnzrpwRiQjWG3EbaZVRiGdeSullGG0gLR y4QU2pvlv4kmm8eWuUV93Bl8Vo9EOjQBrrDyWR9g8LaUhpf5EgW03YEC1hYWKa1Fc/av U88vSdIel9eGNWtl3nDHxRtzIK0fif5fUqhFHmqfZgFSvnAEtYaPisCMtTRaJMTgQuuw Eh0A== X-Forwarded-Encrypted: i=1; AJvYcCXgRgQ9of4Vxc3MSe0e7IXpDv/9maDNRDXq5WCdIiR8zL8STfiluSd0HAuyYbk8LHZDiYAWFLjDXUo8WRlt3mIVY00Zk6thTtaHVP/G X-Gm-Message-State: AOJu0YzRN0I7e0lym8UsYgtV/8tIsRUD+4WrQFTO3ufY4iq0ny5Bywzw 8spUPOY7QU0MmWtiV0QtlGNcEi70S3w0chrw3UrIiQ4z3bgBqO9h9G4HA276szJmaeFMg+tAy56 4m+TmiLbNiXz65Q== X-Google-Smtp-Source: AGHT+IHXWaPLyNfBDOUrupOCFt26TQxeRbB1i6NKLfWplBjOilufWplqhgM19MdKKwZATUX83JfPRq4Jh/dX/Vk= X-Received: from vilasbhat-emu.c.googlers.com ([fda3:e722:ac3:cc00:dc:567e:c0a8:8f2]) (user=vilasbhat job=sendgmr) by 2002:a25:1984:0:b0:dce:5218:c89b with SMTP id 126-20020a251984000000b00dce5218c89bmr478937ybz.5.1708533724903; Wed, 21 Feb 2024 08:42:04 -0800 (PST) Date: Wed, 21 Feb 2024 16:41:10 +0000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.44.0.rc0.258.g7320e95886-goog Message-ID: <20240221164112.846409-1-vilasbhat@google.com> Subject: [PATCH v1] PM: runtime: add tracepoint for runtime_status changes From: Vilas Bhat To: "Rafael J. Wysocki" , Pavel Machek , Len Brown , Greg Kroah-Hartman , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers Cc: Vilas Bhat , Saravana Kannan , kernel-team@android.com, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Existing runtime PM ftrace events (`rpm_suspend`, `rpm_resume`, `rpm_return_int`) offer limited visibility into the exact timing of device runtime power state transitions, particularly when asynchronous operations are involved. When the `rpm_suspend` or `rpm_resume` functions are invoked with the `RPM_ASYNC` flag, a return value of 0 i.e., success merely indicates that the device power state request has been queued, not that the device has yet transitioned. A new ftrace event, `rpm_status`, is introduced. This event directly logs the `power.runtime_status` value of a device whenever it changes providing granular tracking of runtime power state transitions regardless of synchronous or asynchronous `rpm_suspend` / `rpm_resume` usage. Signed-off-by: Vilas Bhat --- drivers/base/power/runtime.c | 1 + include/trace/events/rpm.h | 36 ++++++++++++++++++++++++++++++++++++ 2 files changed, 37 insertions(+) diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index 05793c9fbb84..d10354847878 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -94,6 +94,7 @@ static void update_pm_runtime_accounting(struct device *d= ev) static void __update_runtime_status(struct device *dev, enum rpm_status st= atus) { update_pm_runtime_accounting(dev); + trace_rpm_status(dev, status); dev->power.runtime_status =3D status; } =20 diff --git a/include/trace/events/rpm.h b/include/trace/events/rpm.h index 3c716214dab1..f1dc4e95dbce 100644 --- a/include/trace/events/rpm.h +++ b/include/trace/events/rpm.h @@ -101,6 +101,42 @@ TRACE_EVENT(rpm_return_int, __entry->ret) ); =20 +#define RPM_STATUS_STRINGS \ + { RPM_INVALID, "RPM_INVALID" }, \ + { RPM_ACTIVE, "RPM_ACTIVE" }, \ + { RPM_RESUMING, "RPM_RESUMING" }, \ + { RPM_SUSPENDED, "RPM_SUSPENDED" }, \ + { RPM_SUSPENDING, "RPM_SUSPENDING" } + +/* + * ftrace's __print_symbolic requires that all enum values be wrapped in t= he + * TRACE_DEFINE_ENUM macro so that the enum value can be encoded in the ft= race + * ring buffer. + */ +TRACE_DEFINE_ENUM(RPM_INVALID); +TRACE_DEFINE_ENUM(RPM_ACTIVE); +TRACE_DEFINE_ENUM(RPM_RESUMING); +TRACE_DEFINE_ENUM(RPM_SUSPENDED); +TRACE_DEFINE_ENUM(RPM_SUSPENDING); + +TRACE_EVENT(rpm_status, + TP_PROTO(struct device *dev, enum rpm_status status), + TP_ARGS(dev, status), + + TP_STRUCT__entry( + __string(name, dev_name(dev)) + __field(int, status) + ), + + TP_fast_assign( + __assign_str(name, dev_name(dev)); + __entry->status =3D status; + ), + + TP_printk("%s status=3D%s", __get_str(name), + __print_symbolic(__entry->status, RPM_STATUS_STRINGS)) +); + #endif /* _TRACE_RUNTIME_POWER_H */ =20 /* This part must be outside protection */ --=20 2.44.0.rc0.258.g7320e95886-goog