From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C9E44C35FE7 for ; Sun, 15 Sep 2024 08:50:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Subject:Cc:To: From:Date:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=3gX+mzwc6kZxuFc0jfG/yfXscSyRPR4S5u3SBTLh66U=; b=0jdQKT77v/w6ZxFzmd9h905h96 BQ3nCcK0KwEeLqP6wlz/t4QE92fginXEK80+uGHrheRVOWJDW7tv7yKaHbPljiN41wNOkf8dPdn0l DY1O4V8hMim+sravSkov9BDvkrFjswqumzyut9NaF/Ic7+NyCo2EV6AwUC68TYCfsxwgYY8EVjGCA P+tMZLV8hItMOEUaGYYJwolipjSUJAiIsA5jAe3TIxJupg7y8yxstUdlkZFm3jaOALAekbYMs+O+I jEaidh4oQjNnbuwvz2NQiySLV/p9nv6FMDnLSOc0GFgne8Q6oKNetI4+vDA/mYgUu5z2278krydqw u7mGhwpA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1spkxn-00000001r1P-25xf; Sun, 15 Sep 2024 08:50:35 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1spkwi-00000001qwr-3CzQ for linux-arm-kernel@lists.infradead.org; Sun, 15 Sep 2024 08:49:30 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 5ECC65C5440; Sun, 15 Sep 2024 08:49:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A0B7FC4CEC3; Sun, 15 Sep 2024 08:49:24 +0000 (UTC) Date: Sun, 15 Sep 2024 04:49:20 -0400 From: Steven Rostedt To: Catalin Marinas , Will Deacon , linux-arm-kernel@lists.infradead.org Cc: "Masami Hiramatsu (Google)" , Florent Revest , linux-trace-kernel@vger.kernel.org, LKML , Alexei Starovoitov , Jiri Olsa , Arnaldo Carvalho de Melo , Daniel Borkmann , Mark Rutland Subject: Re: [PATCH v14 05/19] function_graph: Pass ftrace_regs to retfunc Message-ID: <20240915044920.29a86d25@rorschach.local.home> In-Reply-To: <172615374207.133222.13117574733580053025.stgit@devnote2> References: <172615368656.133222.2336770908714920670.stgit@devnote2> <172615374207.133222.13117574733580053025.stgit@devnote2> X-Mailer: Claws Mail 3.17.8 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240915_014928_979622_1892BF8A X-CRM114-Status: GOOD ( 29.28 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Can I get an Acked-by from the AARCH64 maintainers for this patch? Thanks! -- Steve [ Note this is modifies the return side ] On Fri, 13 Sep 2024 00:09:02 +0900 "Masami Hiramatsu (Google)" wrote: > From: Masami Hiramatsu (Google) > > Pass ftrace_regs to the fgraph_ops::retfunc(). If ftrace_regs is not > available, it passes a NULL instead. User callback function can access > some registers (including return address) via this ftrace_regs. > > Signed-off-by: Masami Hiramatsu (Google) > --- > Changes in v8: > - Pass ftrace_regs to retfunc, instead of adding retregfunc. > Changes in v6: > - update to use ftrace_regs_get_return_value() because of reordering > patches. > Changes in v3: > - Update for new multiple fgraph. > - Save the return address to instruction pointer in ftrace_regs. > --- > include/linux/ftrace.h | 3 ++- > kernel/trace/fgraph.c | 16 +++++++++++----- > kernel/trace/ftrace.c | 3 ++- > kernel/trace/trace.h | 3 ++- > kernel/trace/trace_functions_graph.c | 7 ++++--- > kernel/trace/trace_irqsoff.c | 3 ++- > kernel/trace/trace_sched_wakeup.c | 3 ++- > kernel/trace/trace_selftest.c | 3 ++- > 8 files changed, 27 insertions(+), 14 deletions(-) > > diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h > index 13987cd63553..e7c41d9988e1 100644 > --- a/include/linux/ftrace.h > +++ b/include/linux/ftrace.h > @@ -1069,7 +1069,8 @@ struct fgraph_ops; > > /* Type of the callback handlers for tracing function graph*/ > typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *, > - struct fgraph_ops *); /* return */ > + struct fgraph_ops *, > + struct ftrace_regs *); /* return */ > typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *, > struct fgraph_ops *, > struct ftrace_regs *); /* entry */ > diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c > index 30bebe43607d..6a3e2db16aa4 100644 > --- a/kernel/trace/fgraph.c > +++ b/kernel/trace/fgraph.c > @@ -297,7 +297,8 @@ static int entry_run(struct ftrace_graph_ent *trace, struct fgraph_ops *ops, > } > > /* ftrace_graph_return set to this to tell some archs to run function graph */ > -static void return_run(struct ftrace_graph_ret *trace, struct fgraph_ops *ops) > +static void return_run(struct ftrace_graph_ret *trace, struct fgraph_ops *ops, > + struct ftrace_regs *fregs) > { > } > > @@ -491,7 +492,8 @@ int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace, > } > > static void ftrace_graph_ret_stub(struct ftrace_graph_ret *trace, > - struct fgraph_ops *gops) > + struct fgraph_ops *gops, > + struct ftrace_regs *fregs) > { > } > > @@ -787,6 +789,9 @@ __ftrace_return_to_handler(struct ftrace_regs *fregs, unsigned long frame_pointe > } > > trace.rettime = trace_clock_local(); > + if (fregs) > + ftrace_regs_set_instruction_pointer(fregs, ret); > + > #ifdef CONFIG_FUNCTION_GRAPH_RETVAL > trace.retval = ftrace_regs_get_return_value(fregs); > #endif > @@ -796,7 +801,7 @@ __ftrace_return_to_handler(struct ftrace_regs *fregs, unsigned long frame_pointe > #ifdef CONFIG_HAVE_STATIC_CALL > if (static_branch_likely(&fgraph_do_direct)) { > if (test_bit(fgraph_direct_gops->idx, &bitmap)) > - static_call(fgraph_retfunc)(&trace, fgraph_direct_gops); > + static_call(fgraph_retfunc)(&trace, fgraph_direct_gops, fregs); > } else > #endif > { > @@ -806,7 +811,7 @@ __ftrace_return_to_handler(struct ftrace_regs *fregs, unsigned long frame_pointe > if (gops == &fgraph_stub) > continue; > > - gops->retfunc(&trace, gops); > + gops->retfunc(&trace, gops, fregs); > } > } > > @@ -956,7 +961,8 @@ void ftrace_graph_sleep_time_control(bool enable) > * Simply points to ftrace_stub, but with the proper protocol. > * Defined by the linker script in linux/vmlinux.lds.h > */ > -void ftrace_stub_graph(struct ftrace_graph_ret *trace, struct fgraph_ops *gops); > +void ftrace_stub_graph(struct ftrace_graph_ret *trace, struct fgraph_ops *gops, > + struct ftrace_regs *fregs); > > /* The callbacks that hook a function */ > trace_func_graph_ret_t ftrace_graph_return = ftrace_stub_graph; > diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c > index 775040a9f541..fd6c5a50c5e5 100644 > --- a/kernel/trace/ftrace.c > +++ b/kernel/trace/ftrace.c > @@ -840,7 +840,8 @@ static int profile_graph_entry(struct ftrace_graph_ent *trace, > } > > static void profile_graph_return(struct ftrace_graph_ret *trace, > - struct fgraph_ops *gops) > + struct fgraph_ops *gops, > + struct ftrace_regs *fregs) > { > struct ftrace_ret_stack *ret_stack; > struct ftrace_profile_stat *stat; > diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h > index 28d8ad5e31e6..f4a3f75bd916 100644 > --- a/kernel/trace/trace.h > +++ b/kernel/trace/trace.h > @@ -682,7 +682,8 @@ void trace_latency_header(struct seq_file *m); > void trace_default_header(struct seq_file *m); > void print_trace_header(struct seq_file *m, struct trace_iterator *iter); > > -void trace_graph_return(struct ftrace_graph_ret *trace, struct fgraph_ops *gops); > +void trace_graph_return(struct ftrace_graph_ret *trace, struct fgraph_ops *gops, > + struct ftrace_regs *fregs); > int trace_graph_entry(struct ftrace_graph_ent *trace, struct fgraph_ops *gops, > struct ftrace_regs *fregs); > > diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c > index b9785fc919c9..241407000109 100644 > --- a/kernel/trace/trace_functions_graph.c > +++ b/kernel/trace/trace_functions_graph.c > @@ -240,7 +240,7 @@ void __trace_graph_return(struct trace_array *tr, > } > > void trace_graph_return(struct ftrace_graph_ret *trace, > - struct fgraph_ops *gops) > + struct fgraph_ops *gops, struct ftrace_regs *fregs) > { > unsigned long *task_var = fgraph_get_task_var(gops); > struct trace_array *tr = gops->private; > @@ -270,7 +270,8 @@ void trace_graph_return(struct ftrace_graph_ret *trace, > } > > static void trace_graph_thresh_return(struct ftrace_graph_ret *trace, > - struct fgraph_ops *gops) > + struct fgraph_ops *gops, > + struct ftrace_regs *fregs) > { > ftrace_graph_addr_finish(gops, trace); > > @@ -283,7 +284,7 @@ static void trace_graph_thresh_return(struct ftrace_graph_ret *trace, > (trace->rettime - trace->calltime < tracing_thresh)) > return; > else > - trace_graph_return(trace, gops); > + trace_graph_return(trace, gops, fregs); > } > > static struct fgraph_ops funcgraph_ops = { > diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c > index ad739d76fc86..504de7a05498 100644 > --- a/kernel/trace/trace_irqsoff.c > +++ b/kernel/trace/trace_irqsoff.c > @@ -208,7 +208,8 @@ static int irqsoff_graph_entry(struct ftrace_graph_ent *trace, > } > > static void irqsoff_graph_return(struct ftrace_graph_ret *trace, > - struct fgraph_ops *gops) > + struct fgraph_ops *gops, > + struct ftrace_regs *fregs) > { > struct trace_array *tr = irqsoff_trace; > struct trace_array_cpu *data; > diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c > index 23360a2700de..9ffbd9326898 100644 > --- a/kernel/trace/trace_sched_wakeup.c > +++ b/kernel/trace/trace_sched_wakeup.c > @@ -144,7 +144,8 @@ static int wakeup_graph_entry(struct ftrace_graph_ent *trace, > } > > static void wakeup_graph_return(struct ftrace_graph_ret *trace, > - struct fgraph_ops *gops) > + struct fgraph_ops *gops, > + struct ftrace_regs *fregs) > { > struct trace_array *tr = wakeup_trace; > struct trace_array_cpu *data; > diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c > index 89067f02094a..1ebd0899238f 100644 > --- a/kernel/trace/trace_selftest.c > +++ b/kernel/trace/trace_selftest.c > @@ -807,7 +807,8 @@ static __init int store_entry(struct ftrace_graph_ent *trace, > } > > static __init void store_return(struct ftrace_graph_ret *trace, > - struct fgraph_ops *gops) > + struct fgraph_ops *gops, > + struct ftrace_regs *fregs) > { > struct fgraph_fixture *fixture = container_of(gops, struct fgraph_fixture, gops); > const char *type = fixture->store_type_name;