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Message-Id: <169945369135.55307.16963023663631933656.stgit@devnote2>
Date: Wed, 8 Nov 2023 23:28:11 +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>, Sven Schnelle <svens@...ux.ibm.com>,
Alexei Starovoitov <ast@...nel.org>,
Jiri Olsa <jolsa@...nel.org>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Alan Maguire <alan.maguire@...cle.com>,
Mark Rutland <mark.rutland@....com>,
Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>,
Guo Ren <guoren@...nel.org>
Subject: [RFC PATCH v2 20/31] function_graph: Add a new exit handler with parent_ip and ftrace_regs
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Add a new return handler to fgraph_ops as 'retregfunc' which takes
parent_ip and ftrace_regs instead of ftrace_graph_ret. This handler
is available only if the arch support CONFIG_HAVE_FUNCTION_GRAPH_FREGS.
Note that the 'retfunc' and 'reregfunc' are mutual exclusive.
You can set only one of them.
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
---
arch/x86/include/asm/ftrace.h | 2 +
include/linux/ftrace.h | 10 +++++-
kernel/trace/Kconfig | 5 ++-
kernel/trace/fgraph.c | 74 +++++++++++++++++++++++++++--------------
4 files changed, 63 insertions(+), 28 deletions(-)
diff --git a/arch/x86/include/asm/ftrace.h b/arch/x86/include/asm/ftrace.h
index fc60974a1d89..4701d009c215 100644
--- a/arch/x86/include/asm/ftrace.h
+++ b/arch/x86/include/asm/ftrace.h
@@ -72,6 +72,8 @@ arch_ftrace_get_regs(struct ftrace_regs *fregs)
override_function_with_return(&(fregs)->regs)
#define ftrace_regs_query_register_offset(name) \
regs_query_register_offset(name)
+#define ftrace_regs_get_frame_pointer(fregs) \
+ frame_pointer(&(fregs)->regs)
struct ftrace_ops;
#define ftrace_graph_func ftrace_graph_func
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index c91b234949d5..8efccd911d41 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -43,7 +43,9 @@ struct dyn_ftrace;
char *arch_ftrace_match_adjust(char *str, const char *search);
-#ifdef CONFIG_HAVE_FUNCTION_GRAPH_RETVAL
+#ifdef CONFIG_HAVE_FUNCTION_GRAPH_FREGS
+unsigned long ftrace_return_to_handler(struct ftrace_regs *fregs);
+#elif defined(CONFIG_HAVE_FUNCTION_GRAPH_RETVAL)
struct fgraph_ret_regs;
unsigned long ftrace_return_to_handler(struct fgraph_ret_regs *ret_regs);
#else
@@ -156,6 +158,7 @@ struct ftrace_regs {
#define ftrace_regs_set_instruction_pointer(fregs, ip) do { } while (0)
#endif /* CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS */
+
static __always_inline struct pt_regs *ftrace_get_regs(struct ftrace_regs *fregs)
{
if (!fregs)
@@ -1066,6 +1069,10 @@ typedef int (*trace_func_graph_regs_ent_t)(unsigned long func,
unsigned long parent_ip,
struct ftrace_regs *fregs,
struct fgraph_ops *); /* entry w/ regs */
+typedef void (*trace_func_graph_regs_ret_t)(unsigned long func,
+ unsigned long parent_ip,
+ struct ftrace_regs *,
+ struct fgraph_ops *); /* return w/ regs */
extern int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace, struct fgraph_ops *gops);
@@ -1075,6 +1082,7 @@ struct fgraph_ops {
trace_func_graph_ent_t entryfunc;
trace_func_graph_ret_t retfunc;
trace_func_graph_regs_ent_t entryregfunc;
+ trace_func_graph_regs_ret_t retregfunc;
struct ftrace_ops ops; /* for the hash lists */
void *private;
int idx;
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 61c541c36596..308b3bec01b1 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -34,6 +34,9 @@ config HAVE_FUNCTION_GRAPH_TRACER
config HAVE_FUNCTION_GRAPH_RETVAL
bool
+config HAVE_FUNCTION_GRAPH_FREGS
+ bool
+
config HAVE_DYNAMIC_FTRACE
bool
help
@@ -232,7 +235,7 @@ config FUNCTION_GRAPH_TRACER
config FUNCTION_GRAPH_RETVAL
bool "Kernel Function Graph Return Value"
- depends on HAVE_FUNCTION_GRAPH_RETVAL
+ depends on HAVE_FUNCTION_GRAPH_RETVAL || HAVE_FUNCTION_GRAPH_FREGS
depends on FUNCTION_GRAPH_TRACER
default n
help
diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c
index 6567b18c6c54..cf240914ef9b 100644
--- a/kernel/trace/fgraph.c
+++ b/kernel/trace/fgraph.c
@@ -623,8 +623,7 @@ int function_graph_enter_regs(unsigned long ret, unsigned long func,
/* Retrieve a function return address to the trace stack on thread info.*/
static struct ftrace_ret_stack *
-ftrace_pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret,
- unsigned long frame_pointer)
+ftrace_pop_return_trace(unsigned long *ret, unsigned long frame_pointer)
{
struct ftrace_ret_stack *ret_stack;
int index;
@@ -669,10 +668,6 @@ ftrace_pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret,
#endif
*ret = ret_stack->ret;
- trace->func = ret_stack->func;
- trace->calltime = ret_stack->calltime;
- trace->overrun = atomic_read(¤t->trace_overrun);
- trace->depth = current->curr_ret_depth;
/*
* We still want to trace interrupts coming in if
* max_depth is set to 1. Make sure the decrement is
@@ -711,22 +706,43 @@ static struct notifier_block ftrace_suspend_notifier = {
/* fgraph_ret_regs is not defined without CONFIG_FUNCTION_GRAPH_RETVAL */
struct fgraph_ret_regs;
+static void fgraph_call_retfunc(struct ftrace_regs *fregs,
+ struct fgraph_ret_regs *ret_regs,
+ struct ftrace_ret_stack *ret_stack,
+ struct fgraph_ops *gops)
+{
+ struct ftrace_graph_ret trace;
+
+ trace.func = ret_stack->func;
+ trace.calltime = ret_stack->calltime;
+ trace.overrun = atomic_read(¤t->trace_overrun);
+ trace.depth = current->curr_ret_depth;
+ trace.rettime = trace_clock_local();
+#ifdef CONFIG_FUNCTION_GRAPH_RETVAL
+ if (fregs)
+ trace.retval = ftrace_regs_return_value(fregs);
+ else
+ trace.retval = fgraph_ret_regs_return_value(ret_regs);
+#endif
+ gops->retfunc(&trace, gops);
+}
+
/*
* Send the trace to the ring-buffer.
* @return the original return address.
*/
-static unsigned long __ftrace_return_to_handler(struct fgraph_ret_regs *ret_regs,
+static unsigned long __ftrace_return_to_handler(struct ftrace_regs *fregs,
+ struct fgraph_ret_regs *ret_regs,
unsigned long frame_pointer)
{
struct ftrace_ret_stack *ret_stack;
- struct ftrace_graph_ret trace;
- unsigned long ret;
+ struct fgraph_ops *gops;
int curr_ret_stack;
+ unsigned long ret;
int stop_at;
int index;
- int idx;
- ret_stack = ftrace_pop_return_trace(&trace, &ret, frame_pointer);
+ ret_stack = ftrace_pop_return_trace(&ret, frame_pointer);
if (unlikely(!ret_stack)) {
ftrace_graph_stop();
@@ -735,11 +751,6 @@ static unsigned long __ftrace_return_to_handler(struct fgraph_ret_regs *ret_regs
return (unsigned long)panic;
}
- trace.rettime = trace_clock_local();
-#ifdef CONFIG_FUNCTION_GRAPH_RETVAL
- trace.retval = fgraph_ret_regs_return_value(ret_regs);
-#endif
-
curr_ret_stack = current->curr_ret_stack;
index = get_ret_stack_index(current, curr_ret_stack - 1);
@@ -752,8 +763,11 @@ static unsigned long __ftrace_return_to_handler(struct fgraph_ret_regs *ret_regs
val = current->ret_stack[curr_ret_stack - 1];
switch (__get_type(val)) {
case FGRAPH_TYPE_ARRAY:
- idx = __get_array(val);
- fgraph_array[idx]->retfunc(&trace, fgraph_array[idx]);
+ gops = fgraph_array[__get_array(val)];
+ if (gops->retregfunc)
+ gops->retregfunc(ret_stack->func, ret, fregs, gops);
+ else
+ fgraph_call_retfunc(fregs, ret_regs, ret_stack, gops);
curr_ret_stack -= __get_index(val);
break;
case FGRAPH_TYPE_RESERVED:
@@ -777,20 +791,22 @@ static unsigned long __ftrace_return_to_handler(struct fgraph_ret_regs *ret_regs
return ret;
}
-/*
- * After all architecures have selected HAVE_FUNCTION_GRAPH_RETVAL, we can
- * leave only ftrace_return_to_handler(ret_regs).
- */
-#ifdef CONFIG_HAVE_FUNCTION_GRAPH_RETVAL
+#ifdef CONFIG_HAVE_FUNCTION_GRAPH_FREGS
+unsigned long ftrace_return_to_handler(struct ftrace_regs *fregs)
+{
+ return __ftrace_return_to_handler(fregs, NULL,
+ ftrace_regs_get_frame_pointer(fregs));
+}
+#elif defined(CONFIG_HAVE_FUNCTION_GRAPH_RETVAL)
unsigned long ftrace_return_to_handler(struct fgraph_ret_regs *ret_regs)
{
- return __ftrace_return_to_handler(ret_regs,
+ return __ftrace_return_to_handler(NULL, ret_regs,
fgraph_ret_regs_frame_pointer(ret_regs));
}
#else
unsigned long ftrace_return_to_handler(unsigned long frame_pointer)
{
- return __ftrace_return_to_handler(NULL, frame_pointer);
+ return __ftrace_return_to_handler(NULL, NULL, frame_pointer);
}
#endif
@@ -1131,9 +1147,15 @@ int register_ftrace_graph(struct fgraph_ops *gops)
int ret = 0;
int i;
- if (gops->entryfunc && gops->entryregfunc)
+ if ((gops->entryfunc && gops->entryregfunc) ||
+ (gops->retfunc && gops->retregfunc))
return -EINVAL;
+#ifndef CONFIG_HAVE_FUNCTION_GRAPH_FREGS
+ if (gops->retregfunc)
+ return -EOPNOTSUPP;
+#endif
+
mutex_lock(&ftrace_lock);
if (!gops->ops.func) {
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