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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. 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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> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: coh6c5ph7gpjq9xc5b8ufqi3m5jfrbx9 X-Rspam-User: X-Rspamd-Queue-Id: CC27B1A000F X-Rspamd-Server: rspam04 X-HE-Tag: 1758714739-648286 X-HE-Meta: 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 Xd8ytAdJ VEXAcVdzYgsDcrGFZtM1kIv/TAFNfmYv8osAcRu51xYMZs8PSZZoFjN9zVjuouLWUwnudqhWuM/fiU8TVTpOaeZIMED5xW3/qbiJ0T5mmHBW1340Lpjg8BNjHvU5TwHgiYm/UB0A0RqHUO4OmuslVxoQayt+981xsRwSn9dJXsQE3UqRw/gutqOPWJVx3mzF74blCWXvny4si/QA2uayxgepKvXBMldL2l7FNlgr9Yz6nq7grSAuAnYtIuh7VgrrZopX+5ql94QpHyudkjnnV5EHpFaOpPU5HZZ/gSf31vnzQLLgR1sPxwZnjdYPeXNWZ5lzDJda3zkFu/AjTSmY0W/XHkcwQ24WVw1C8Rdv3NwWcnKbFjF4V2MCCNGxYX6R8fHwXeuy50Tr09AVJfj7Le3bP1ygeXve4GgWFHXJXoSfyFfsKMuDoeS/EYRPwyLowTkckeMFb6Po08e/C6OtN8f3u6k0Xee+4sVWz+johYn6WbiFY6MeGwFdzS2fvItwGPKLNBLq7Jkf8iDL/2PX4YHXI9HSnuIG9xYjGARPu7y1YanxYnFvq8hrOJrUegJ6vTo8i184GUpvy4hXG1uXxRO3CSA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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