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Message-ID: <173518992972.391279.14055405490327765506.stgit@devnote2>
Date: Thu, 26 Dec 2024 14:12:09 +0900
From: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To: Alexei Starovoitov <alexei.starovoitov@...il.com>,
Steven Rostedt <rostedt@...dmis.org>,
Florent Revest <revest@...omium.org>
Cc: linux-trace-kernel@...r.kernel.org,
LKML <linux-kernel@...r.kernel.org>,
Martin KaFai Lau <martin.lau@...ux.dev>,
bpf <bpf@...r.kernel.org>,
Alexei Starovoitov <ast@...nel.org>,
Jiri Olsa <jolsa@...nel.org>,
Alan Maguire <alan.maguire@...cle.com>,
Mark Rutland <mark.rutland@....com>,
linux-arch@...r.kernel.org
Subject: [PATCH v22 04/20] fgraph: Pass ftrace_regs to retfunc
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
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) <mhiramat@...nel.org>
---
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 069f270bd7ae..9a1e768e47da 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -1075,7 +1075,8 @@ 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 51196f10d96e..c928527251e3 100644
--- a/kernel/trace/fgraph.c
+++ b/kernel/trace/fgraph.c
@@ -299,7 +299,8 @@ 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)
{
}
@@ -528,7 +529,8 @@ 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)
{
}
@@ -825,6 +827,9 @@ __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
@@ -834,7 +839,7 @@ __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
{
@@ -844,7 +849,7 @@ __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);
}
}
@@ -1016,7 +1021,8 @@ 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 e04e058faccf..bd2fc0274115 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -850,7 +850,8 @@ 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 profile_fgraph_data *profile_data;
struct ftrace_profile_stat *stat;
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 0f38f36a5a8a..5f3e68a8d8a0 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -693,7 +693,8 @@ 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 b62ad912d84f..d0e4f412c298 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -315,7 +315,7 @@ static void handle_nosleeptime(struct ftrace_graph_ret *trace,
}
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;
@@ -355,7 +355,8 @@ 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)
{
struct fgraph_times *ftimes;
int size;
@@ -379,7 +380,7 @@ static void trace_graph_thresh_return(struct ftrace_graph_ret *trace,
(trace->rettime - ftimes->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 0d9e1075d815..8165382a174a 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 f54493f8783d..d88c44f1dfa5 100644
--- a/kernel/trace/trace_selftest.c
+++ b/kernel/trace/trace_selftest.c
@@ -808,7 +808,8 @@ 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;
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