From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f202.google.com (mail-pg1-f202.google.com [209.85.215.202]) (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 6BF673128B2 for ; Thu, 4 Dec 2025 02:50:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764816625; cv=none; b=DGzbQOB3RAjrHJcEH4FA3+aKnjWwWxmHBx+0P4KL+Avg4CIYKpTU5TUsvbtxpDF3u/ALRzG+UaJNw1Rf7QNvgEJovXiOi5DImgqhIiG+4i63Sp5Yv25NIc99O8p5bmKQ012R62jiAKBrzD5zXQvGH2b++jaQsuLoxROkTQR7qFg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764816625; c=relaxed/simple; bh=Wqf1Q6l/7NQ/XB6VRxojAG8M0xThMqraEmNr0p/Gptc=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=elP28XLR+rn2+MPn5vT+cLJtRb09pmy7mIFSXscfUMCozfQxj0NhUx2/6d0WQTOjH5E9fxZ7p15JfrJThdrG3K72Nbk5mSdTzYAIUZM0oJZQKd4HGZVHRQ6DzJLnwgxFKZ1CeB5hHunyO7DjvayP9vh+yzOvcFLN5KRraU+hedo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--wusamuel.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=dxIBNmcF; arc=none smtp.client-ip=209.85.215.202 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--wusamuel.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="dxIBNmcF" Received: by mail-pg1-f202.google.com with SMTP id 41be03b00d2f7-b969f3f5c13so402416a12.0 for ; Wed, 03 Dec 2025 18:50:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1764816613; x=1765421413; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=MVWB8hYtCwwcLrdiadBsaKa3b576mee91Y0siXmwXaI=; b=dxIBNmcFRc77Nvu5SFgWPUo0B92XTBiKXG1FnF2Fnr1jBavdKdxI34ScjjCnDpRQw2 EzNXgqp4YwT6qpTTE7mxzTmKpnO7NIIhVmjqo0qviRuPvaOD3df9WQuFzC0WNm128pQy eVbFqvW2zohmGBkKi+zEIUoL6mP7vSiOxkkIeMgmDpQqssJ+vaNW05EspjASdj/0sdaO HkX6SdLvKzJUQxnnogbnEOYPRqRkUtqLN97Xq08jTVgxgrKHgJ8PDD4PfAo3Yyr1W1MA 8lrkYl3oXG1xtdUEc1zBrAFEQ8MgKANaXieX7n+tTeZ00vLop3VFKyq9jtv6cU8/Uwqz IIxQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1764816613; x=1765421413; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=MVWB8hYtCwwcLrdiadBsaKa3b576mee91Y0siXmwXaI=; b=m56nrGkIqwCuo96O3H6x4rHZciqhdITY5o8stuqoWJxzELVkFyIHRx7JSchoQ8nn9L oFrKANwWN5g2NIJnGM8gXnPp2RLvz1IDcMZg3DLBsizlYwx5ozH08hqht+jSX0kPjsiO LFFjl3Ex0a+zHMC489HZq8Gyy3b/oHnXvg8VhhYhWgMT/aAPJoWHVdRnYIyJg7OQdFPb O7H68FGMBJBKYbzHAhNCLRUVg1uQh/JVWaWisfZNC2eZGRnk/ftExAQKDkV9Y9u5o935 3uXLcbUlQ0jZ87RSA6ylqdCqiwalYXoJRDuNS/Kjl9hQkF430jM3Q3jkFTfP4RsLbCyv sqHQ== X-Forwarded-Encrypted: i=1; AJvYcCVypIRDzpjCYNFXhux27O+Nj7+kFfAz0rWeBipgDAQ3TDjTdtp5JDdOJLuknHUgoUCOmD/bBMmmdD9HWRE=@vger.kernel.org X-Gm-Message-State: AOJu0YzGsYT4zc9CsBp4igPokER9ds+8+irsvD6MiCNQwnvUYDkjlPOa wpTc0bQR1TPvvMeXgcTQyeHH+UjGskC6MyuEHVqgDBHx7KYacJO6v8fJqdbTqqZApPQje+o/KkV IpU6aYhrBab5Vqw== X-Google-Smtp-Source: AGHT+IGYWQuKWSewRxlU8L6DiRrvrEKqNqkG7Y6XzWNDEeOrH2BjtMRztQwO5FnwUg0IYePOuaYns8zr3HDmZA== X-Received: from dyjh23.prod.google.com ([2002:a05:7300:5617:b0:2a4:7a56:1730]) (user=wusamuel job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7300:8186:b0:2a4:3593:4667 with SMTP id 5a478bee46e88-2aba422c0demr1077343eec.3.1764816612751; Wed, 03 Dec 2025 18:50:12 -0800 (PST) Date: Wed, 3 Dec 2025 18:49:57 -0800 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 2.52.0.177.g9f829587af-goog Message-ID: <20251204025003.3162056-1-wusamuel@google.com> Subject: [PATCH v1 0/4] bpf: Add wakeup_source iterators From: Samuel Wu To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Shuah Khan Cc: rafael.j.wysocki@intel.com, Samuel Wu , kernel-team@android.com, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org Content-Type: text/plain; charset="UTF-8" This patch series introduces BPF iterators for wakeup_source, enabling BPF programs to efficiently traverse a device's wakeup sources. Currently, inspecting wakeup sources typically involves reading interfaces like /sys/class/wakeup/* or debugfs. The repeated syscalls to query the sysfs nodes is inefficient, as there can be hundreds of wakeup_sources, and each wakeup source have multiple stats, with one sysfs node per stat. debugfs is unstable and insecure. This series implements two types of iterators: 1. Standard BPF Iterator: Allows creating a BPF link to iterate over wakeup sources 2. Open-coded Iterator: Enables the use of wakeup_source iterators directly within BPF programs Both iterators utilize pre-existing APIs wakeup_sources_walk_* to traverse over the SRCU that backs the list of wakeup_sources. Samuel Wu (4): bpf: Add wakeup_source iterator bpf: Open coded BPF for wakeup_sources selftests/bpf: Add tests for wakeup_sources selftests/bpf: Open coded BPF wakeup_sources test kernel/bpf/Makefile | 1 + kernel/bpf/helpers.c | 3 + kernel/bpf/wakeup_source_iter.c | 137 ++++++++ .../testing/selftests/bpf/bpf_experimental.h | 5 + tools/testing/selftests/bpf/config | 1 + .../bpf/prog_tests/wakeup_source_iter.c | 323 ++++++++++++++++++ .../selftests/bpf/progs/wakeup_source_iter.c | 117 +++++++ 7 files changed, 587 insertions(+) create mode 100644 kernel/bpf/wakeup_source_iter.c create mode 100644 tools/testing/selftests/bpf/prog_tests/wakeup_source_iter.c create mode 100644 tools/testing/selftests/bpf/progs/wakeup_source_iter.c -- 2.52.0.177.g9f829587af-goog