diff mbox series

[v6,22/36] function_graph: Add a new entry handler with parent_ip and ftrace_regs

Message ID 170505451140.459169.10466274060076226583.stgit@devnote2 (mailing list archive)
State Not Applicable
Headers show
Series tracing: fprobe: function_graph: Multi-function graph and fprobe on fgraph | expand

Checks

Context Check Description
bpf/vmtest-bpf-next-VM_Test-1 success Logs for ShellCheck
bpf/vmtest-bpf-next-VM_Test-0 success Logs for Lint
bpf/vmtest-bpf-next-VM_Test-2 success Logs for Unittests
bpf/vmtest-bpf-next-VM_Test-3 success Logs for Validate matrix.py
bpf/vmtest-bpf-next-VM_Test-5 success Logs for aarch64-gcc / build-release
bpf/vmtest-bpf-next-VM_Test-4 success Logs for aarch64-gcc / build / build for aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-6 success Logs for aarch64-gcc / test (test_maps, false, 360) / test_maps on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-7 fail Logs for aarch64-gcc / test (test_progs, false, 360) / test_progs on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-8 fail Logs for aarch64-gcc / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-9 fail Logs for aarch64-gcc / test (test_verifier, false, 360) / test_verifier on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-10 success Logs for aarch64-gcc / veristat
bpf/vmtest-bpf-next-VM_Test-12 success Logs for s390x-gcc / build-release
bpf/vmtest-bpf-next-VM_Test-11 success Logs for s390x-gcc / build / build for s390x with gcc
bpf/vmtest-bpf-next-VM_Test-16 fail Logs for s390x-gcc / test (test_verifier, false, 360) / test_verifier on s390x with gcc
bpf/vmtest-bpf-next-VM_Test-17 success Logs for s390x-gcc / veristat
bpf/vmtest-bpf-next-VM_Test-18 success Logs for set-matrix
bpf/vmtest-bpf-next-VM_Test-19 success Logs for x86_64-gcc / build / build for x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-20 success Logs for x86_64-gcc / build-release
bpf/vmtest-bpf-next-VM_Test-21 success Logs for x86_64-gcc / test (test_maps, false, 360) / test_maps on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-22 fail Logs for x86_64-gcc / test (test_progs, false, 360) / test_progs on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-23 fail Logs for x86_64-gcc / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-24 success Logs for x86_64-gcc / test (test_progs_no_alu32_parallel, true, 30) / test_progs_no_alu32_parallel on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-25 success Logs for x86_64-gcc / test (test_progs_parallel, true, 30) / test_progs_parallel on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-26 fail Logs for x86_64-gcc / test (test_verifier, false, 360) / test_verifier on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-27 success Logs for x86_64-gcc / veristat / veristat on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-28 success Logs for x86_64-llvm-17 / build / build for x86_64 with llvm-17
bpf/vmtest-bpf-next-VM_Test-30 success Logs for x86_64-llvm-17 / test (test_maps, false, 360) / test_maps on x86_64 with llvm-17
bpf/vmtest-bpf-next-VM_Test-31 fail Logs for x86_64-llvm-17 / test (test_progs, false, 360) / test_progs on x86_64 with llvm-17
bpf/vmtest-bpf-next-VM_Test-32 fail Logs for x86_64-llvm-17 / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on x86_64 with llvm-17
bpf/vmtest-bpf-next-VM_Test-33 fail Logs for x86_64-llvm-17 / test (test_verifier, false, 360) / test_verifier on x86_64 with llvm-17
bpf/vmtest-bpf-next-VM_Test-34 success Logs for x86_64-llvm-17 / veristat
bpf/vmtest-bpf-next-VM_Test-35 success Logs for x86_64-llvm-18 / build / build for x86_64 with llvm-18
bpf/vmtest-bpf-next-VM_Test-36 success Logs for x86_64-llvm-18 / build-release / build for x86_64 with llvm-18 and -O2 optimization
bpf/vmtest-bpf-next-VM_Test-37 success Logs for x86_64-llvm-18 / test (test_maps, false, 360) / test_maps on x86_64 with llvm-18
bpf/vmtest-bpf-next-VM_Test-38 fail Logs for x86_64-llvm-18 / test (test_progs, false, 360) / test_progs on x86_64 with llvm-18
bpf/vmtest-bpf-next-VM_Test-39 fail Logs for x86_64-llvm-18 / test (test_progs_cpuv4, false, 360) / test_progs_cpuv4 on x86_64 with llvm-18
bpf/vmtest-bpf-next-VM_Test-40 fail Logs for x86_64-llvm-18 / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on x86_64 with llvm-18
bpf/vmtest-bpf-next-VM_Test-41 fail Logs for x86_64-llvm-18 / test (test_verifier, false, 360) / test_verifier on x86_64 with llvm-18
bpf/vmtest-bpf-next-VM_Test-42 success Logs for x86_64-llvm-18 / veristat
bpf/vmtest-bpf-next-VM_Test-29 success Logs for x86_64-llvm-17 / build-release / build for x86_64 with llvm-17 and -O2 optimization
bpf/vmtest-bpf-next-VM_Test-15 fail Logs for s390x-gcc / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on s390x with gcc
bpf/vmtest-bpf-next-VM_Test-14 fail Logs for s390x-gcc / test (test_progs, false, 360) / test_progs on s390x with gcc
bpf/vmtest-bpf-next-PR fail PR summary
bpf/vmtest-bpf-next-VM_Test-13 success Logs for s390x-gcc / test (test_maps, false, 360) / test_maps on s390x with gcc
netdev/series_format fail Series longer than 15 patches (and no cover letter)
netdev/tree_selection success Guessed tree name to be net-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 5702 this patch: 5702
netdev/cc_maintainers success CCed 0 of 0 maintainers
netdev/build_clang success Errors and warnings before: 1306 this patch: 1306
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 6382 this patch: 6382
netdev/checkpatch warning WARNING: line length of 81 exceeds 80 columns WARNING: line length of 82 exceeds 80 columns WARNING: line length of 84 exceeds 80 columns WARNING: line length of 85 exceeds 80 columns
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 7 this patch: 7
netdev/source_inline fail Was 0 now: 2

Commit Message

Masami Hiramatsu (Google) Jan. 12, 2024, 10:15 a.m. UTC 
From: Masami Hiramatsu (Google) <mhiramat@kernel.org>

Add a new entry handler to fgraph_ops as 'entryregfunc'  which takes
parent_ip and ftrace_regs. Note that the 'entryfunc' and 'entryregfunc'
are mutual exclusive. You can set only one of them.

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
---
 Changes in v3:
  - Update for new multiple fgraph.
---
 arch/arm64/kernel/ftrace.c               |    2 +
 arch/loongarch/kernel/ftrace_dyn.c       |    6 ++++
 arch/powerpc/kernel/trace/ftrace.c       |    2 +
 arch/powerpc/kernel/trace/ftrace_64_pg.c |   10 ++++---
 arch/x86/kernel/ftrace.c                 |   42 ++++++++++++++++--------------
 include/linux/ftrace.h                   |   19 +++++++++++---
 kernel/trace/fgraph.c                    |   30 +++++++++++++++++----
 7 files changed, 76 insertions(+), 35 deletions(-)
diff mbox series

Patch

diff --git a/arch/arm64/kernel/ftrace.c b/arch/arm64/kernel/ftrace.c
index b96740829798..779b975f03f5 100644
--- a/arch/arm64/kernel/ftrace.c
+++ b/arch/arm64/kernel/ftrace.c
@@ -497,7 +497,7 @@  void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
 		return;
 
 	if (!function_graph_enter_ops(*parent, ip, frame_pointer,
-				      (void *)frame_pointer, gops))
+				      (void *)frame_pointer, fregs, gops))
 		*parent = (unsigned long)&return_to_handler;
 
 	ftrace_test_recursion_unlock(bit);
diff --git a/arch/loongarch/kernel/ftrace_dyn.c b/arch/loongarch/kernel/ftrace_dyn.c
index 73858c9029cc..39b3f09a5e0c 100644
--- a/arch/loongarch/kernel/ftrace_dyn.c
+++ b/arch/loongarch/kernel/ftrace_dyn.c
@@ -244,7 +244,11 @@  void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
 	struct pt_regs *regs = &fregs->regs;
 	unsigned long *parent = (unsigned long *)&regs->regs[1];
 
-	prepare_ftrace_return(ip, (unsigned long *)parent);
+	if (unlikely(atomic_read(&current->tracing_graph_pause)))
+		return;
+
+	if (!function_graph_enter_regs(regs->regs[1], ip, 0, parent, fregs))
+		regs->regs[1] = (unsigned long)&return_to_handler;
 }
 #else
 static int ftrace_modify_graph_caller(bool enable)
diff --git a/arch/powerpc/kernel/trace/ftrace.c b/arch/powerpc/kernel/trace/ftrace.c
index 82010629cf88..9bf1b6912116 100644
--- a/arch/powerpc/kernel/trace/ftrace.c
+++ b/arch/powerpc/kernel/trace/ftrace.c
@@ -422,7 +422,7 @@  void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
 	if (bit < 0)
 		goto out;
 
-	if (!function_graph_enter(parent_ip, ip, 0, (unsigned long *)sp))
+	if (!function_graph_enter_regs(parent_ip, ip, 0, (unsigned long *)sp, fregs))
 		parent_ip = ppc_function_entry(return_to_handler);
 
 	ftrace_test_recursion_unlock(bit);
diff --git a/arch/powerpc/kernel/trace/ftrace_64_pg.c b/arch/powerpc/kernel/trace/ftrace_64_pg.c
index 7b85c3b460a3..43f6cfaaf7db 100644
--- a/arch/powerpc/kernel/trace/ftrace_64_pg.c
+++ b/arch/powerpc/kernel/trace/ftrace_64_pg.c
@@ -795,7 +795,8 @@  int ftrace_disable_ftrace_graph_caller(void)
  * in current thread info. Return the address we want to divert to.
  */
 static unsigned long
-__prepare_ftrace_return(unsigned long parent, unsigned long ip, unsigned long sp)
+__prepare_ftrace_return(unsigned long parent, unsigned long ip, unsigned long sp,
+			struct ftrace_regs *fregs)
 {
 	unsigned long return_hooker;
 	int bit;
@@ -812,7 +813,7 @@  __prepare_ftrace_return(unsigned long parent, unsigned long ip, unsigned long sp
 
 	return_hooker = ppc_function_entry(return_to_handler);
 
-	if (!function_graph_enter(parent, ip, 0, (unsigned long *)sp))
+	if (!function_graph_enter_regs(parent, ip, 0, (unsigned long *)sp, fregs))
 		parent = return_hooker;
 
 	ftrace_test_recursion_unlock(bit);
@@ -824,13 +825,14 @@  __prepare_ftrace_return(unsigned long parent, unsigned long ip, unsigned long sp
 void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
 		       struct ftrace_ops *op, struct ftrace_regs *fregs)
 {
-	fregs->regs.link = __prepare_ftrace_return(parent_ip, ip, fregs->regs.gpr[1]);
+	fregs->regs.link = __prepare_ftrace_return(parent_ip, ip,
+						   fregs->regs.gpr[1], fregs);
 }
 #else
 unsigned long prepare_ftrace_return(unsigned long parent, unsigned long ip,
 				    unsigned long sp)
 {
-	return __prepare_ftrace_return(parent, ip, sp);
+	return __prepare_ftrace_return(parent, ip, sp, NULL);
 }
 #endif
 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index 845e29b4254f..0f757e399a96 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -614,16 +614,8 @@  int ftrace_disable_ftrace_graph_caller(void)
 }
 #endif /* CONFIG_DYNAMIC_FTRACE && !CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS */
 
-/*
- * Hook the return address and push it in the stack of return addrs
- * in current thread info.
- */
-void prepare_ftrace_return(unsigned long ip, unsigned long *parent,
-			   unsigned long frame_pointer)
+static inline bool skip_ftrace_return(void)
 {
-	unsigned long return_hooker = (unsigned long)&return_to_handler;
-	int bit;
-
 	/*
 	 * When resuming from suspend-to-ram, this function can be indirectly
 	 * called from early CPU startup code while the CPU is in real mode,
@@ -633,13 +625,28 @@  void prepare_ftrace_return(unsigned long ip, unsigned long *parent,
 	 * This check isn't as accurate as virt_addr_valid(), but it should be
 	 * good enough for this purpose, and it's fast.
 	 */
-	if (unlikely((long)__builtin_frame_address(0) >= 0))
-		return;
+	if ((long)__builtin_frame_address(0) >= 0)
+		return true;
 
-	if (unlikely(ftrace_graph_is_dead()))
-		return;
+	if (ftrace_graph_is_dead())
+		return true;
+
+	if (atomic_read(&current->tracing_graph_pause))
+		return true;
+	return false;
+}
 
-	if (unlikely(atomic_read(&current->tracing_graph_pause)))
+/*
+ * Hook the return address and push it in the stack of return addrs
+ * in current thread info.
+ */
+void prepare_ftrace_return(unsigned long ip, unsigned long *parent,
+			   unsigned long frame_pointer)
+{
+	unsigned long return_hooker = (unsigned long)&return_to_handler;
+	int bit;
+
+	if (unlikely(skip_ftrace_return()))
 		return;
 
 	bit = ftrace_test_recursion_trylock(ip, *parent);
@@ -661,17 +668,14 @@  void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
 	struct fgraph_ops *gops = container_of(op, struct fgraph_ops, ops);
 	int bit;
 
-	if (unlikely(ftrace_graph_is_dead()))
-		return;
-
-	if (unlikely(atomic_read(&current->tracing_graph_pause)))
+	if (unlikely(skip_ftrace_return()))
 		return;
 
 	bit = ftrace_test_recursion_trylock(ip, *parent);
 	if (bit < 0)
 		return;
 
-	if (!function_graph_enter_ops(*parent, ip, 0, parent, gops))
+	if (!function_graph_enter_ops(*parent, ip, 0, parent, fregs, gops))
 		*parent = (unsigned long)&return_to_handler;
 
 	ftrace_test_recursion_unlock(bit);
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 815e865f46c9..65d4d4b68768 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -1063,6 +1063,11 @@  typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *,
 typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *,
 				      struct fgraph_ops *); /* entry */
 
+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 */
+
 extern int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace, struct fgraph_ops *gops);
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
@@ -1070,6 +1075,7 @@  extern int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace, struct fgraph
 struct fgraph_ops {
 	trace_func_graph_ent_t		entryfunc;
 	trace_func_graph_ret_t		retfunc;
+	trace_func_graph_regs_ent_t	entryregfunc;
 	struct ftrace_ops		ops; /* for the hash lists */
 	void				*private;
 	int				idx;
@@ -1106,13 +1112,20 @@  struct ftrace_ret_stack {
 extern void return_to_handler(void);
 
 extern int
-function_graph_enter(unsigned long ret, unsigned long func,
-		     unsigned long frame_pointer, unsigned long *retp);
+function_graph_enter_regs(unsigned long ret, unsigned long func,
+			  unsigned long frame_pointer, unsigned long *retp,
+			  struct ftrace_regs *fregs);
+
+static inline int function_graph_enter(unsigned long ret, unsigned long func,
+				       unsigned long fp, unsigned long *retp)
+{
+	return function_graph_enter_regs(ret, func, fp, retp, NULL);
+}
 
 extern int
 function_graph_enter_ops(unsigned long ret, unsigned long func,
 			 unsigned long frame_pointer, unsigned long *retp,
-			 struct fgraph_ops *gops);
+			 struct ftrace_regs *fregs, struct fgraph_ops *gops);
 
 struct ftrace_ret_stack *
 ftrace_graph_get_ret_stack(struct task_struct *task, int idx);
diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c
index 6a9206ebc6a2..0cb02de2db70 100644
--- a/kernel/trace/fgraph.c
+++ b/kernel/trace/fgraph.c
@@ -621,9 +621,21 @@  ftrace_push_return_trace(unsigned long ret, unsigned long func,
 # define MCOUNT_INSN_SIZE 0
 #endif
 
+static inline int call_entry_func(struct ftrace_graph_ent *trace,
+				  unsigned long func, unsigned long ret,
+				  struct ftrace_regs *fregs,
+				  struct fgraph_ops *gops)
+{
+	if (gops->entryregfunc)
+		return gops->entryregfunc(func, ret, fregs, gops);
+
+	return gops->entryfunc(trace, gops);
+}
+
 /* If the caller does not use ftrace, call this function. */
-int function_graph_enter(unsigned long ret, unsigned long func,
-			 unsigned long frame_pointer, unsigned long *retp)
+int function_graph_enter_regs(unsigned long ret, unsigned long func,
+			      unsigned long frame_pointer, unsigned long *retp,
+			      struct ftrace_regs *fregs)
 {
 	struct ftrace_graph_ent trace;
 	unsigned long bitmap = 0;
@@ -658,7 +670,7 @@  int function_graph_enter(unsigned long ret, unsigned long func,
 
 		save_curr_ret_stack = current->curr_ret_stack;
 		if (ftrace_ops_test(&gops->ops, func, NULL) &&
-		    gops->entryfunc(&trace, gops))
+		    call_entry_func(&trace, func, ret, fregs, gops))
 			bitmap |= BIT(i);
 		else
 			/* Clear out any saved storage */
@@ -686,6 +698,7 @@  int function_graph_enter(unsigned long ret, unsigned long func,
 /* This is called from ftrace_graph_func() via ftrace */
 int function_graph_enter_ops(unsigned long ret, unsigned long func,
 			     unsigned long frame_pointer, unsigned long *retp,
+			     struct ftrace_regs *fregs,
 			     struct fgraph_ops *gops)
 {
 	struct ftrace_graph_ent trace;
@@ -710,7 +723,7 @@  int function_graph_enter_ops(unsigned long ret, unsigned long func,
 	trace.func = func;
 	trace.depth = current->curr_ret_depth;
 	save_curr_ret_stack = current->curr_ret_stack;
-	if (gops->entryfunc(&trace, gops)) {
+	if (call_entry_func(&trace, func, ret, fregs, gops)) {
 		if (type == FGRAPH_TYPE_RESERVED)
 			set_fgraph_index_bitmap(current, index, BIT(gops->idx));
 		else
@@ -993,7 +1006,8 @@  void fgraph_init_ops(struct ftrace_ops *dst_ops,
 		     struct ftrace_ops *src_ops)
 {
 	dst_ops->func = ftrace_graph_func;
-	dst_ops->flags = FTRACE_OPS_FL_PID | FTRACE_OPS_GRAPH_STUB;
+	dst_ops->flags = FTRACE_OPS_FL_PID | FTRACE_OPS_GRAPH_STUB |
+			 FTRACE_OPS_FL_SAVE_ARGS;
 
 #ifdef FTRACE_GRAPH_TRAMP_ADDR
 	dst_ops->trampoline = FTRACE_GRAPH_TRAMP_ADDR;
@@ -1239,10 +1253,14 @@  int register_ftrace_graph(struct fgraph_ops *gops)
 	int ret = 0;
 	int i;
 
+	if (gops->entryfunc && gops->entryregfunc)
+		return -EINVAL;
+
 	mutex_lock(&ftrace_lock);
 
 	if (!gops->ops.func) {
-		gops->ops.flags |= FTRACE_OPS_GRAPH_STUB;
+		gops->ops.flags |= FTRACE_OPS_GRAPH_STUB |
+				   FTRACE_OPS_FL_SAVE_ARGS;
 		gops->ops.func = ftrace_graph_func;
 #ifdef FTRACE_GRAPH_TRAMP_ADDR
 		gops->ops.trampoline = FTRACE_GRAPH_TRAMP_ADDR;