From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f180.google.com (mail-pl1-f180.google.com [209.85.214.180]) (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 85D77305066 for ; Wed, 24 Sep 2025 11:52:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.180 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758714745; cv=none; b=Z+cZ0YwP3M0zHTLkyZ2fyKBwK1JJlTXsIu8cf+1mrkJAKMVcTSF+xfB1z9rEsqoGaSTR5V5QGYyzA2HlgCWQzTirx4oXB0Iv8ivuSpPUSR0X2GT8L2crgZ3PI6JR7Y5ekXnH25P5W3B2QnjOlVCI2lyuFpD/1jBO3+BBDkOBb8o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758714745; c=relaxed/simple; bh=fgMlahiCQseGsOMwUDeQip37398eJhQex5YpJdEa4RY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=LP8uliIY6hglwF+QYLt2vbfvIdIlo4RxEG1pve6ZxB+xC3OqCJR9hOAgk+3ijISvmrLsLeLlJOnoU7SBE1w/XiX6+zC8pZ7vld6//9L0NvyXoTNL9DxMjnBNPgIqga4dn7dEGR6ODQbgNZyxGYi4dbLJZZrdQlK5WPYab9y8QVU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=MEVhAX1f; arc=none smtp.client-ip=209.85.214.180 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="MEVhAX1f" Received: by mail-pl1-f180.google.com with SMTP id d9443c01a7336-27d4d6b7ab5so26556935ad.2 for ; Wed, 24 Sep 2025 04:52:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1758714739; x=1759319539; darn=lists.linux.dev; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=Zjvk/jwcgtCF9TRiT6Fv94jzQiYOsdOhmjAblUevyNs=; b=MEVhAX1fP/mMNO5TGeu5bzDClQLGgfel74NcazgQWgJTko2alQ2HSZhWVbwZLJ8F7Y 1QhP+lYlb8weupj461xDtaoZwmvqXRymRqt8qJTLUdVqpsnUFDSX6yjNwKyH8ECTe7zF QfXOrFPMfAUllhEpgmew0CSofVYOtRdPMkxK6EAX4EaBxunyesE5u3d5E8IYRGhWLvcl R3W21wSBIWuAH7CbIW0V30p4VAFgN/OwIy/FptaDTbhgWuF7RTUxHHYYoodZDokEy0ro x6L/SliBXTejtyZnzQS9QTNyq1ehTn2eKPm/sn/gcjhv+MZPLgs8TYp0O6X9y2qeT6T1 EWjg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1758714739; x=1759319539; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Zjvk/jwcgtCF9TRiT6Fv94jzQiYOsdOhmjAblUevyNs=; b=oTDpBLs9NktMB2qrafXp1sEK0h2tbyogBE7q2u3kOe3FQEx8sGg++yH9MmSDeA37eo ZhIsHWZfJrX9wSWN+cjunXxESGPj7lPWCfhtLzhx4cxKJzWXucWWJZjo7kks23fJrzy2 W77NWyQLikJ9ldmRuGUOfrA8G4XIqffLRQY2bszqmuzw5dIQa4ePgEnerpmJ58xNWHf6 ql/qc0KTxiSMCijLJEvhKsHMB4hbIhYjlkPgsvqf0IN0FP4Z2rTd3PLkHMU5pc2scWpb jThWslWRqad7YERjHRCSu4tsP9rTiUY06noImhB8tboT7dHEogkdjD23btWphUPth9hL pr1g== X-Forwarded-Encrypted: i=1; AJvYcCU3yowIR8o+AXHwBMtKGQFBFQenmcN3MSEKYxR3gHs87t9D1xCYFdav+m7v5rRYxaUVXCpl@lists.linux.dev X-Gm-Message-State: AOJu0YzjlFIOQTJQQ/RciiaoFsrWPIzIUIRe0uQ/q+oobdYa4DxEAz4P KN3SpXYTEclt1Ml0PvpX+xIlNky4FVgufcN1+8ZPcqolpIqzk43f1hMr X-Gm-Gg: ASbGncvueAQYlZLj4uMGxgGDXGT8i0hdl29aykO/zRv6lgH6/mFcTSxi3SNxTrmKQJL eqnjXMD9cSUombnmAE86PflTIPM7X0IivIU8MFwmUI6qe9TTOpSGdUycQjzhUPeOdh5951oXKcI ZVo3PjCHJ+0evXbQWxY10GjhlmRI0NI/6Y1hw2DEGbhGQyKfVyaJBRCi1nEoC8rIIhlcvZkSY3n XtE99B+mLBGi5dfjLxD3H9HJnPoSwz3quGaic20BvMO5wbIfA3Ys9d/djGonYK3Gs56oamj7XbF wEwPcVmvAjtwENPZGBjv+58YSaEpk1e9TKUj1fehZhH+iqKhz5R7horm9Pi6zMY9XOLhUEPeuWz QlI0eWFCPPVPaazhNbr95dhhs0g== X-Google-Smtp-Source: AGHT+IEDDMc95VZgHrJ2bAg4UbEi7E3pBoXcjCjpFvkax+6hzWgfw34rDBIIXWBy56pkk1ir13aqcg== X-Received: by 2002:a17:902:e78e:b0:270:ea84:324a with SMTP id d9443c01a7336-27cc5624e4emr73742285ad.38.1758714738650; Wed, 24 Sep 2025 04:52:18 -0700 (PDT) Received: from localhost ([23.142.224.65]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2752328629fsm101241105ad.106.2025.09.24.04.52.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 24 Sep 2025 04:52:18 -0700 (PDT) From: Jinchao Wang To: Andrew Morton , Masami Hiramatsu , Peter Zijlstra , Mike Rapoport , Alexander Potapenko , Randy Dunlap , Jonathan Corbet , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , "Liang, Kan" , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Kees Cook , Alice Ryhl , Sami Tolvanen , Miguel Ojeda , Masahiro Yamada , Rong Xu , Naveen N Rao , David Kaplan , Andrii Nakryiko , Jinjie Ruan , Nam Cao , workflows@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-mm@kvack.org, llvm@lists.linux.dev, Andrey Ryabinin , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , kasan-dev@googlegroups.com, "David S. Miller" , Mathieu Desnoyers , linux-trace-kernel@vger.kernel.org Cc: Jinchao Wang Subject: [PATCH v5 12/23] mm/ksw: add entry kprobe and exit fprobe management Date: Wed, 24 Sep 2025 19:50:55 +0800 Message-ID: <20250924115124.194940-13-wangjinchao600@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250924115124.194940-1-wangjinchao600@gmail.com> References: <20250924115124.194940-1-wangjinchao600@gmail.com> Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Provide ksw_stack_init() and ksw_stack_exit() to manage entry and exit probes for the target function from ksw_get_config(). Signed-off-by: Jinchao Wang --- mm/kstackwatch/kstackwatch.h | 4 ++ mm/kstackwatch/stack.c | 101 +++++++++++++++++++++++++++++++++++ 2 files changed, 105 insertions(+) diff --git a/mm/kstackwatch/kstackwatch.h b/mm/kstackwatch/kstackwatch.h index 850fc2b18a9c..4045890e5652 100644 --- a/mm/kstackwatch/kstackwatch.h +++ b/mm/kstackwatch/kstackwatch.h @@ -35,6 +35,10 @@ struct ksw_config { // singleton, only modified in kernel.c const struct ksw_config *ksw_get_config(void); +/* stack management */ +int ksw_stack_init(void); +void ksw_stack_exit(void); + /* watch management */ struct ksw_watchpoint { struct perf_event *__percpu *event; diff --git a/mm/kstackwatch/stack.c b/mm/kstackwatch/stack.c index cec594032515..9f59f41d954c 100644 --- a/mm/kstackwatch/stack.c +++ b/mm/kstackwatch/stack.c @@ -1 +1,102 @@ // SPDX-License-Identifier: GPL-2.0 +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include + +#include "kstackwatch.h" + +static struct kprobe entry_probe; +static struct fprobe exit_probe; + +static int ksw_stack_prepare_watch(struct pt_regs *regs, + const struct ksw_config *config, + ulong *watch_addr, u16 *watch_len) +{ + /* implement logic will be added in following patches */ + *watch_addr = 0; + *watch_len = 0; + return 0; +} + +static void ksw_stack_entry_handler(struct kprobe *p, struct pt_regs *regs, + unsigned long flags) +{ + struct ksw_ctx *ctx = ¤t->ksw_ctx; + ulong watch_addr; + u16 watch_len; + int ret; + + ret = ksw_watch_get(&ctx->wp); + if (ret) + return; + + ret = ksw_stack_prepare_watch(regs, ksw_get_config(), &watch_addr, + &watch_len); + if (ret) { + ksw_watch_off(ctx->wp); + ctx->wp = NULL; + pr_err("failed to prepare watch target: %d\n", ret); + return; + } + + ret = ksw_watch_on(ctx->wp, watch_addr, watch_len); + if (ret) { + pr_err("failed to watch on depth:%d addr:0x%lx len:%u %d\n", + ksw_get_config()->depth, watch_addr, watch_len, ret); + return; + } + +} + +static void ksw_stack_exit_handler(struct fprobe *fp, unsigned long ip, + unsigned long ret_ip, + struct ftrace_regs *regs, void *data) +{ + struct ksw_ctx *ctx = ¤t->ksw_ctx; + + + if (ctx->wp) { + ksw_watch_off(ctx->wp); + ctx->wp = NULL; + ctx->sp = 0; + } +} + +int ksw_stack_init(void) +{ + int ret; + char *symbuf = NULL; + + memset(&entry_probe, 0, sizeof(entry_probe)); + entry_probe.symbol_name = ksw_get_config()->func_name; + entry_probe.offset = ksw_get_config()->func_offset; + entry_probe.post_handler = ksw_stack_entry_handler; + ret = register_kprobe(&entry_probe); + if (ret) { + pr_err("failed to register kprobe ret %d\n", ret); + return ret; + } + + memset(&exit_probe, 0, sizeof(exit_probe)); + exit_probe.exit_handler = ksw_stack_exit_handler; + symbuf = (char *)ksw_get_config()->func_name; + + ret = register_fprobe_syms(&exit_probe, (const char **)&symbuf, 1); + if (ret < 0) { + pr_err("failed to register fprobe ret %d\n", ret); + unregister_kprobe(&entry_probe); + return ret; + } + + return 0; +} + +void ksw_stack_exit(void) +{ + unregister_fprobe(&exit_probe); + unregister_kprobe(&entry_probe); +} -- 2.43.0