From nobody Wed Nov 27 02:43:58 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 06E8514C5B3; Tue, 15 Oct 2024 01:29:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728955786; cv=none; b=NODtartiyf28VY1StkqQpFxub2oxNW2OdHcZw0HsquXXjCdC0T8tXBN2PwUM1AQWM2JJX8hWlIzvWItgY951ie4LCmSjZPjQ1kHcC5qqPAftPW+xznpD1Wx8j/d6KcuPCRmviFroTnROykA1G2clEWWPohSH4FNnzNTHFm96niQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728955786; c=relaxed/simple; bh=k3wOd8kbtoedCHJ0nb/80Uaw4jW0AOIpHTHKRfI6KUk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=a56c6Cf8OPNHzendYKyXgrz7EsAPjtU9k7gq2IoKxxhd2LrCkIMOuGyG8lreCMj0PJ7Q7KvBIpltu9KD97HtduYeXruHFochjfijHPXlbnA+8lvC8/AlNDN+FChRgsKJzNHf7OlKIsandveZYG/2twDe58zScZVdNmMsESoUgOs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=mEKD8r0M; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="mEKD8r0M" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B1E42C4CEC6; Tue, 15 Oct 2024 01:29:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1728955785; bh=k3wOd8kbtoedCHJ0nb/80Uaw4jW0AOIpHTHKRfI6KUk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mEKD8r0MoRD+jvXUhZ9Yx3toAgfUCXvj6i0Da50nUwNEt6ltKG31cxaueglrv6MqW T1A+r8jc1vO3XWwsAwd5cu1Aa4NREX9H7E82IsfOYNa184mub1leEzgkYZEDoi/s5M xAdl/n7TGkD3pwdneGo/J3i+X6LCmWP1bP4uZUwK+Xq+vAb5qIzSJYieSWZ1mtNFK9 UsuVS3cevZylWa35kW4wwK0Y+EO4iMyfNCaSCHjEYaV4SXn0baeAYpwJK3jlDpLQaL WBWDU1gvAVZaSeMatJBi9JxkUX20lg6zYezwl5QOwX1S/ShetrM9Q967xoy+9MlviX z0vaRtduXBpog== From: "Masami Hiramatsu (Google)" To: Alexei Starovoitov , Steven Rostedt , Florent Revest Cc: linux-trace-kernel@vger.kernel.org, LKML , Martin KaFai Lau , bpf , Alexei Starovoitov , Jiri Olsa , Alan Maguire , Mark Rutland , linux-arch@vger.kernel.org Subject: [PATCH v16 06/18] fprobe: Use ftrace_regs in fprobe entry handler Date: Tue, 15 Oct 2024 10:29:41 +0900 Message-ID: <172895578164.107311.4608999268276079758.stgit@devnote2> X-Mailer: git-send-email 2.43.0 In-Reply-To: <172895571278.107311.14000164546881236558.stgit@devnote2> References: <172895571278.107311.14000164546881236558.stgit@devnote2> User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable From: Masami Hiramatsu (Google) This allows fprobes to be available with CONFIG_DYNAMIC_FTRACE_WITH_ARGS instead of CONFIG_DYNAMIC_FTRACE_WITH_REGS, then we can enable fprobe on arm64. Signed-off-by: Masami Hiramatsu (Google) Acked-by: Florent Revest --- Changes in v6: - Keep using SAVE_REGS flag to avoid breaking bpf kprobe-multi test. --- include/linux/fprobe.h | 2 +- kernel/trace/Kconfig | 3 ++- kernel/trace/bpf_trace.c | 10 +++++++--- kernel/trace/fprobe.c | 3 ++- kernel/trace/trace_fprobe.c | 6 +++++- lib/test_fprobe.c | 4 ++-- samples/fprobe/fprobe_example.c | 2 +- 7 files changed, 20 insertions(+), 10 deletions(-) diff --git a/include/linux/fprobe.h b/include/linux/fprobe.h index f39869588117..ca64ee5e45d2 100644 --- a/include/linux/fprobe.h +++ b/include/linux/fprobe.h @@ -10,7 +10,7 @@ struct fprobe; =20 typedef int (*fprobe_entry_cb)(struct fprobe *fp, unsigned long entry_ip, - unsigned long ret_ip, struct pt_regs *regs, + unsigned long ret_ip, struct ftrace_regs *regs, void *entry_data); =20 typedef void (*fprobe_exit_cb)(struct fprobe *fp, unsigned long entry_ip, diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index c5ab2a561272..f10ca86fbfad 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -297,7 +297,7 @@ config DYNAMIC_FTRACE_WITH_ARGS config FPROBE bool "Kernel Function Probe (fprobe)" depends on FUNCTION_TRACER - depends on DYNAMIC_FTRACE_WITH_REGS + depends on DYNAMIC_FTRACE_WITH_REGS || DYNAMIC_FTRACE_WITH_ARGS depends on HAVE_RETHOOK select RETHOOK default n @@ -682,6 +682,7 @@ config FPROBE_EVENTS select TRACING select PROBE_EVENTS select DYNAMIC_EVENTS + depends on DYNAMIC_FTRACE_WITH_REGS default y help This allows user to add tracing events on the function entry and diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index a582cd25ca87..7f9903260dcb 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -2517,7 +2517,7 @@ struct bpf_session_run_ctx { void *data; }; =20 -#ifdef CONFIG_FPROBE +#if defined(CONFIG_FPROBE) && defined(CONFIG_DYNAMIC_FTRACE_WITH_REGS) struct bpf_kprobe_multi_link { struct bpf_link link; struct fprobe fp; @@ -2769,12 +2769,16 @@ kprobe_multi_link_prog_run(struct bpf_kprobe_multi_= link *link, =20 static int kprobe_multi_link_handler(struct fprobe *fp, unsigned long fentry_ip, - unsigned long ret_ip, struct pt_regs *regs, + unsigned long ret_ip, struct ftrace_regs *fregs, void *data) { + struct pt_regs *regs =3D ftrace_get_regs(fregs); struct bpf_kprobe_multi_link *link; int err; =20 + if (!regs) + return 0; + link =3D container_of(fp, struct bpf_kprobe_multi_link, fp); err =3D kprobe_multi_link_prog_run(link, get_entry_ip(fentry_ip), regs, f= alse, data); return is_kprobe_session(link->link.prog) ? err : 0; @@ -3049,7 +3053,7 @@ int bpf_kprobe_multi_link_attach(const union bpf_attr= *attr, struct bpf_prog *pr kvfree(cookies); return err; } -#else /* !CONFIG_FPROBE */ +#else /* !CONFIG_FPROBE || !CONFIG_DYNAMIC_FTRACE_WITH_REGS */ int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_pr= og *prog) { return -EOPNOTSUPP; diff --git a/kernel/trace/fprobe.c b/kernel/trace/fprobe.c index 9ff018245840..3d3789283873 100644 --- a/kernel/trace/fprobe.c +++ b/kernel/trace/fprobe.c @@ -46,7 +46,7 @@ static inline void __fprobe_handler(unsigned long ip, uns= igned long parent_ip, } =20 if (fp->entry_handler) - ret =3D fp->entry_handler(fp, ip, parent_ip, ftrace_get_regs(fregs), ent= ry_data); + ret =3D fp->entry_handler(fp, ip, parent_ip, fregs, entry_data); =20 /* If entry_handler returns !0, nmissed is not counted. */ if (rh) { @@ -182,6 +182,7 @@ static void fprobe_init(struct fprobe *fp) fp->ops.func =3D fprobe_kprobe_handler; else fp->ops.func =3D fprobe_handler; + fp->ops.flags |=3D FTRACE_OPS_FL_SAVE_REGS; } =20 diff --git a/kernel/trace/trace_fprobe.c b/kernel/trace/trace_fprobe.c index a079abd8955b..f73b78187389 100644 --- a/kernel/trace/trace_fprobe.c +++ b/kernel/trace/trace_fprobe.c @@ -339,12 +339,16 @@ NOKPROBE_SYMBOL(fexit_perf_func); #endif /* CONFIG_PERF_EVENTS */ =20 static int fentry_dispatcher(struct fprobe *fp, unsigned long entry_ip, - unsigned long ret_ip, struct pt_regs *regs, + unsigned long ret_ip, struct ftrace_regs *fregs, void *entry_data) { struct trace_fprobe *tf =3D container_of(fp, struct trace_fprobe, fp); + struct pt_regs *regs =3D ftrace_get_regs(fregs); int ret =3D 0; =20 + if (!regs) + return 0; + if (trace_probe_test_flag(&tf->tp, TP_FLAG_TRACE)) fentry_trace_func(tf, entry_ip, regs); #ifdef CONFIG_PERF_EVENTS diff --git a/lib/test_fprobe.c b/lib/test_fprobe.c index 24de0e5ff859..ff607babba18 100644 --- a/lib/test_fprobe.c +++ b/lib/test_fprobe.c @@ -40,7 +40,7 @@ static noinline u32 fprobe_selftest_nest_target(u32 value= , u32 (*nest)(u32)) =20 static notrace int fp_entry_handler(struct fprobe *fp, unsigned long ip, unsigned long ret_ip, - struct pt_regs *regs, void *data) + struct ftrace_regs *fregs, void *data) { KUNIT_EXPECT_FALSE(current_test, preemptible()); /* This can be called on the fprobe_selftest_target and the fprobe_selfte= st_target2 */ @@ -81,7 +81,7 @@ static notrace void fp_exit_handler(struct fprobe *fp, un= signed long ip, =20 static notrace int nest_entry_handler(struct fprobe *fp, unsigned long ip, unsigned long ret_ip, - struct pt_regs *regs, void *data) + struct ftrace_regs *fregs, void *data) { KUNIT_EXPECT_FALSE(current_test, preemptible()); return 0; diff --git a/samples/fprobe/fprobe_example.c b/samples/fprobe/fprobe_exampl= e.c index 0a50b05add96..c234afae52d6 100644 --- a/samples/fprobe/fprobe_example.c +++ b/samples/fprobe/fprobe_example.c @@ -50,7 +50,7 @@ static void show_backtrace(void) =20 static int sample_entry_handler(struct fprobe *fp, unsigned long ip, unsigned long ret_ip, - struct pt_regs *regs, void *data) + struct ftrace_regs *fregs, void *data) { if (use_trace) /*