[for-next][PATCH 00/17] tracing/uprobes: Add support for more fetch methods

[for-next][PATCH 00/17] tracing/uprobes: Add support for more fetch methods

[Steven Rostedt]

  git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
for-next

Head SHA1: b7e0bf341f6cfa92ae0a0e3d0c3496729595e1e9


Hyeoncheol Lee (1):
      tracing/probes: Add fetch{,_size} member into deref fetch method

Namhyung Kim (15):
      tracing/uprobes: Fix documentation of uprobe registration syntax
      tracing/probes: Fix basic print type functions
      tracing/kprobes: Factor out struct trace_probe
      tracing/uprobes: Convert to struct trace_probe
      tracing/kprobes: Move common functions to trace_probe.h
      tracing/probes: Integrate duplicate set_print_fmt()
      tracing/probes: Move fetch function helpers to trace_probe.h
      tracing/probes: Split [ku]probes_fetch_type_table
      tracing/probes: Implement 'stack' fetch method for uprobes
      tracing/probes: Move 'symbol' fetch method to kprobes
      tracing/probes: Implement 'memory' fetch method for uprobes
      tracing/uprobes: Pass 'is_return' to traceprobe_parse_probe_arg()
      tracing/uprobes: Fetch args before reserving a ring buffer
      tracing/uprobes: Add support for full argument access methods
      tracing/uprobes: Add @+file_offset fetch method

Oleg Nesterov (1):
      uprobes: Allocate ->utask before handler_chain() for tracing handlers

----
 Documentation/trace/uprobetracer.txt |  36 +-
 kernel/events/uprobes.c              |   4 +
 kernel/trace/trace_kprobe.c          | 824 +++++++++++++++++++----------------
 kernel/trace/trace_probe.c           | 440 +++++++------------
 kernel/trace/trace_probe.h           | 216 +++++++++
 kernel/trace/trace_uprobe.c          | 495 +++++++++++++++------
 6 files changed, 1214 insertions(+), 801 deletions(-)

[for-next][PATCH 01/17] tracing/uprobes: Fix documentation of uprobe registration syntax

[Steven Rostedt]

[-- Attachment #1: 0001-tracing-uprobes-Fix-documentation-of-uprobe-registra.patch --]
[-- Type: text/plain, Size: 2274 bytes --]

From: Namhyung Kim <namhyung.kim@lge.com>

The uprobe syntax requires an offset after a file path not a symbol.

Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 Documentation/trace/uprobetracer.txt | 10 +++++-----
 kernel/trace/trace_uprobe.c          |  2 +-
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/Documentation/trace/uprobetracer.txt b/Documentation/trace/uprobetracer.txt
index d9c3e68..8f1a8b89 100644
--- a/Documentation/trace/uprobetracer.txt
+++ b/Documentation/trace/uprobetracer.txt
@@ -19,15 +19,15 @@ user to calculate the offset of the probepoint in the object.
 
 Synopsis of uprobe_tracer
 -------------------------
-  p[:[GRP/]EVENT] PATH:SYMBOL[+offs] [FETCHARGS] : Set a uprobe
-  r[:[GRP/]EVENT] PATH:SYMBOL[+offs] [FETCHARGS] : Set a return uprobe (uretprobe)
-  -:[GRP/]EVENT                                  : Clear uprobe or uretprobe event
+  p[:[GRP/]EVENT] PATH:OFFSET [FETCHARGS] : Set a uprobe
+  r[:[GRP/]EVENT] PATH:OFFSET [FETCHARGS] : Set a return uprobe (uretprobe)
+  -:[GRP/]EVENT                           : Clear uprobe or uretprobe event
 
   GRP           : Group name. If omitted, "uprobes" is the default value.
   EVENT         : Event name. If omitted, the event name is generated based
-                  on SYMBOL+offs.
+                  on PATH+OFFSET.
   PATH          : Path to an executable or a library.
-  SYMBOL[+offs] : Symbol+offset where the probe is inserted.
+  OFFSET        : Offset where the probe is inserted.
 
   FETCHARGS     : Arguments. Each probe can have up to 128 args.
    %REG         : Fetch register REG
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index b6dcc42..c77b92d 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -211,7 +211,7 @@ end:
 
 /*
  * Argument syntax:
- *  - Add uprobe: p|r[:[GRP/]EVENT] PATH:SYMBOL [FETCHARGS]
+ *  - Add uprobe: p|r[:[GRP/]EVENT] PATH:OFFSET [FETCHARGS]
  *
  *  - Remove uprobe: -:[GRP/]EVENT
  */
-- 
1.8.4.3

[for-next][PATCH 02/17] tracing/probes: Fix basic print type functions

[Steven Rostedt]

[-- Attachment #1: 0002-tracing-probes-Fix-basic-print-type-functions.patch --]
[-- Type: text/plain, Size: 2561 bytes --]

From: Namhyung Kim <namhyung.kim@lge.com>

The print format of s32 type was "ld" and it's casted to "long".  So
it turned out to print 4294967295 for "-1" on 64-bit systems.  Not
sure whether it worked well on 32-bit systems.

Anyway, it doesn't need to have cast argument at all since it already
casted using type pointer - just get rid of it.  Thanks to Oleg for
pointing that out.

And print 0x prefix for unsigned type as it shows hex numbers.

Suggested-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 kernel/trace/trace_probe.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 412e959..430505b 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -40,23 +40,23 @@ const char *reserved_field_names[] = {
 #define PRINT_TYPE_FMT_NAME(type)	print_type_format_##type
 
 /* Printing  in basic type function template */
-#define DEFINE_BASIC_PRINT_TYPE_FUNC(type, fmt, cast)			\
+#define DEFINE_BASIC_PRINT_TYPE_FUNC(type, fmt)				\
 static __kprobes int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s,	\
 						const char *name,	\
-						void *data, void *ent)\
+						void *data, void *ent)	\
 {									\
-	return trace_seq_printf(s, " %s=" fmt, name, (cast)*(type *)data);\
+	return trace_seq_printf(s, " %s=" fmt, name, *(type *)data);	\
 }									\
 static const char PRINT_TYPE_FMT_NAME(type)[] = fmt;
 
-DEFINE_BASIC_PRINT_TYPE_FUNC(u8, "%x", unsigned int)
-DEFINE_BASIC_PRINT_TYPE_FUNC(u16, "%x", unsigned int)
-DEFINE_BASIC_PRINT_TYPE_FUNC(u32, "%lx", unsigned long)
-DEFINE_BASIC_PRINT_TYPE_FUNC(u64, "%llx", unsigned long long)
-DEFINE_BASIC_PRINT_TYPE_FUNC(s8, "%d", int)
-DEFINE_BASIC_PRINT_TYPE_FUNC(s16, "%d", int)
-DEFINE_BASIC_PRINT_TYPE_FUNC(s32, "%ld", long)
-DEFINE_BASIC_PRINT_TYPE_FUNC(s64, "%lld", long long)
+DEFINE_BASIC_PRINT_TYPE_FUNC(u8 , "0x%x")
+DEFINE_BASIC_PRINT_TYPE_FUNC(u16, "0x%x")
+DEFINE_BASIC_PRINT_TYPE_FUNC(u32, "0x%x")
+DEFINE_BASIC_PRINT_TYPE_FUNC(u64, "0x%Lx")
+DEFINE_BASIC_PRINT_TYPE_FUNC(s8,  "%d")
+DEFINE_BASIC_PRINT_TYPE_FUNC(s16, "%d")
+DEFINE_BASIC_PRINT_TYPE_FUNC(s32, "%d")
+DEFINE_BASIC_PRINT_TYPE_FUNC(s64, "%Ld")
 
 static inline void *get_rloc_data(u32 *dl)
 {
-- 
1.8.4.3

[for-next][PATCH 03/17] tracing/kprobes: Factor out struct trace_probe

[Steven Rostedt]

[-- Attachment #1: 0003-tracing-kprobes-Factor-out-struct-trace_probe.patch --]
[-- Type: text/plain, Size: 42432 bytes --]

From: Namhyung Kim <namhyung.kim@lge.com>

There are functions that can be shared to both of kprobes and uprobes.
Separate common data structure to struct trace_probe and use it from
the shared functions.

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 kernel/trace/trace_kprobe.c | 560 ++++++++++++++++++++++----------------------
 kernel/trace/trace_probe.h  |  20 ++
 2 files changed, 295 insertions(+), 285 deletions(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index dae9541..7271906 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -27,18 +27,12 @@
 /**
  * Kprobe event core functions
  */
-struct trace_probe {
+struct trace_kprobe {
 	struct list_head	list;
 	struct kretprobe	rp;	/* Use rp.kp for kprobe use */
 	unsigned long 		nhit;
-	unsigned int		flags;	/* For TP_FLAG_* */
 	const char		*symbol;	/* symbol name */
-	struct ftrace_event_class	class;
-	struct ftrace_event_call	call;
-	struct list_head	files;
-	ssize_t			size;		/* trace entry size */
-	unsigned int		nr_args;
-	struct probe_arg	args[];
+	struct trace_probe	tp;
 };
 
 struct event_file_link {
@@ -46,56 +40,46 @@ struct event_file_link {
 	struct list_head		list;
 };
 
-#define SIZEOF_TRACE_PROBE(n)			\
-	(offsetof(struct trace_probe, args) +	\
+#define SIZEOF_TRACE_KPROBE(n)				\
+	(offsetof(struct trace_kprobe, tp.args) +	\
 	(sizeof(struct probe_arg) * (n)))
 
 
-static __kprobes bool trace_probe_is_return(struct trace_probe *tp)
+static __kprobes bool trace_kprobe_is_return(struct trace_kprobe *tk)
 {
-	return tp->rp.handler != NULL;
+	return tk->rp.handler != NULL;
 }
 
-static __kprobes const char *trace_probe_symbol(struct trace_probe *tp)
+static __kprobes const char *trace_kprobe_symbol(struct trace_kprobe *tk)
 {
-	return tp->symbol ? tp->symbol : "unknown";
+	return tk->symbol ? tk->symbol : "unknown";
 }
 
-static __kprobes unsigned long trace_probe_offset(struct trace_probe *tp)
+static __kprobes unsigned long trace_kprobe_offset(struct trace_kprobe *tk)
 {
-	return tp->rp.kp.offset;
+	return tk->rp.kp.offset;
 }
 
-static __kprobes bool trace_probe_is_enabled(struct trace_probe *tp)
+static __kprobes bool trace_kprobe_has_gone(struct trace_kprobe *tk)
 {
-	return !!(tp->flags & (TP_FLAG_TRACE | TP_FLAG_PROFILE));
+	return !!(kprobe_gone(&tk->rp.kp));
 }
 
-static __kprobes bool trace_probe_is_registered(struct trace_probe *tp)
-{
-	return !!(tp->flags & TP_FLAG_REGISTERED);
-}
-
-static __kprobes bool trace_probe_has_gone(struct trace_probe *tp)
-{
-	return !!(kprobe_gone(&tp->rp.kp));
-}
-
-static __kprobes bool trace_probe_within_module(struct trace_probe *tp,
-						struct module *mod)
+static __kprobes bool trace_kprobe_within_module(struct trace_kprobe *tk,
+						 struct module *mod)
 {
 	int len = strlen(mod->name);
-	const char *name = trace_probe_symbol(tp);
+	const char *name = trace_kprobe_symbol(tk);
 	return strncmp(mod->name, name, len) == 0 && name[len] == ':';
 }
 
-static __kprobes bool trace_probe_is_on_module(struct trace_probe *tp)
+static __kprobes bool trace_kprobe_is_on_module(struct trace_kprobe *tk)
 {
-	return !!strchr(trace_probe_symbol(tp), ':');
+	return !!strchr(trace_kprobe_symbol(tk), ':');
 }
 
-static int register_probe_event(struct trace_probe *tp);
-static int unregister_probe_event(struct trace_probe *tp);
+static int register_kprobe_event(struct trace_kprobe *tk);
+static int unregister_kprobe_event(struct trace_kprobe *tk);
 
 static DEFINE_MUTEX(probe_lock);
 static LIST_HEAD(probe_list);
@@ -107,42 +91,42 @@ static int kretprobe_dispatcher(struct kretprobe_instance *ri,
 /*
  * Allocate new trace_probe and initialize it (including kprobes).
  */
-static struct trace_probe *alloc_trace_probe(const char *group,
+static struct trace_kprobe *alloc_trace_kprobe(const char *group,
 					     const char *event,
 					     void *addr,
 					     const char *symbol,
 					     unsigned long offs,
 					     int nargs, bool is_return)
 {
-	struct trace_probe *tp;
+	struct trace_kprobe *tk;
 	int ret = -ENOMEM;
 
-	tp = kzalloc(SIZEOF_TRACE_PROBE(nargs), GFP_KERNEL);
-	if (!tp)
+	tk = kzalloc(SIZEOF_TRACE_KPROBE(nargs), GFP_KERNEL);
+	if (!tk)
 		return ERR_PTR(ret);
 
 	if (symbol) {
-		tp->symbol = kstrdup(symbol, GFP_KERNEL);
-		if (!tp->symbol)
+		tk->symbol = kstrdup(symbol, GFP_KERNEL);
+		if (!tk->symbol)
 			goto error;
-		tp->rp.kp.symbol_name = tp->symbol;
-		tp->rp.kp.offset = offs;
+		tk->rp.kp.symbol_name = tk->symbol;
+		tk->rp.kp.offset = offs;
 	} else
-		tp->rp.kp.addr = addr;
+		tk->rp.kp.addr = addr;
 
 	if (is_return)
-		tp->rp.handler = kretprobe_dispatcher;
+		tk->rp.handler = kretprobe_dispatcher;
 	else
-		tp->rp.kp.pre_handler = kprobe_dispatcher;
+		tk->rp.kp.pre_handler = kprobe_dispatcher;
 
 	if (!event || !is_good_name(event)) {
 		ret = -EINVAL;
 		goto error;
 	}
 
-	tp->call.class = &tp->class;
-	tp->call.name = kstrdup(event, GFP_KERNEL);
-	if (!tp->call.name)
+	tk->tp.call.class = &tk->tp.class;
+	tk->tp.call.name = kstrdup(event, GFP_KERNEL);
+	if (!tk->tp.call.name)
 		goto error;
 
 	if (!group || !is_good_name(group)) {
@@ -150,42 +134,42 @@ static struct trace_probe *alloc_trace_probe(const char *group,
 		goto error;
 	}
 
-	tp->class.system = kstrdup(group, GFP_KERNEL);
-	if (!tp->class.system)
+	tk->tp.class.system = kstrdup(group, GFP_KERNEL);
+	if (!tk->tp.class.system)
 		goto error;
 
-	INIT_LIST_HEAD(&tp->list);
-	INIT_LIST_HEAD(&tp->files);
-	return tp;
+	INIT_LIST_HEAD(&tk->list);
+	INIT_LIST_HEAD(&tk->tp.files);
+	return tk;
 error:
-	kfree(tp->call.name);
-	kfree(tp->symbol);
-	kfree(tp);
+	kfree(tk->tp.call.name);
+	kfree(tk->symbol);
+	kfree(tk);
 	return ERR_PTR(ret);
 }
 
-static void free_trace_probe(struct trace_probe *tp)
+static void free_trace_kprobe(struct trace_kprobe *tk)
 {
 	int i;
 
-	for (i = 0; i < tp->nr_args; i++)
-		traceprobe_free_probe_arg(&tp->args[i]);
+	for (i = 0; i < tk->tp.nr_args; i++)
+		traceprobe_free_probe_arg(&tk->tp.args[i]);
 
-	kfree(tp->call.class->system);
-	kfree(tp->call.name);
-	kfree(tp->symbol);
-	kfree(tp);
+	kfree(tk->tp.call.class->system);
+	kfree(tk->tp.call.name);
+	kfree(tk->symbol);
+	kfree(tk);
 }
 
-static struct trace_probe *find_trace_probe(const char *event,
-					    const char *group)
+static struct trace_kprobe *find_trace_kprobe(const char *event,
+					      const char *group)
 {
-	struct trace_probe *tp;
+	struct trace_kprobe *tk;
 
-	list_for_each_entry(tp, &probe_list, list)
-		if (strcmp(tp->call.name, event) == 0 &&
-		    strcmp(tp->call.class->system, group) == 0)
-			return tp;
+	list_for_each_entry(tk, &probe_list, list)
+		if (strcmp(tk->tp.call.name, event) == 0 &&
+		    strcmp(tk->tp.call.class->system, group) == 0)
+			return tk;
 	return NULL;
 }
 
@@ -194,7 +178,7 @@ static struct trace_probe *find_trace_probe(const char *event,
  * if the file is NULL, enable "perf" handler, or enable "trace" handler.
  */
 static int
-enable_trace_probe(struct trace_probe *tp, struct ftrace_event_file *file)
+enable_trace_kprobe(struct trace_kprobe *tk, struct ftrace_event_file *file)
 {
 	int ret = 0;
 
@@ -208,17 +192,17 @@ enable_trace_probe(struct trace_probe *tp, struct ftrace_event_file *file)
 		}
 
 		link->file = file;
-		list_add_tail_rcu(&link->list, &tp->files);
+		list_add_tail_rcu(&link->list, &tk->tp.files);
 
-		tp->flags |= TP_FLAG_TRACE;
+		tk->tp.flags |= TP_FLAG_TRACE;
 	} else
-		tp->flags |= TP_FLAG_PROFILE;
+		tk->tp.flags |= TP_FLAG_PROFILE;
 
-	if (trace_probe_is_registered(tp) && !trace_probe_has_gone(tp)) {
-		if (trace_probe_is_return(tp))
-			ret = enable_kretprobe(&tp->rp);
+	if (trace_probe_is_registered(&tk->tp) && !trace_kprobe_has_gone(tk)) {
+		if (trace_kprobe_is_return(tk))
+			ret = enable_kretprobe(&tk->rp);
 		else
-			ret = enable_kprobe(&tp->rp.kp);
+			ret = enable_kprobe(&tk->rp.kp);
 	}
  out:
 	return ret;
@@ -241,14 +225,14 @@ find_event_file_link(struct trace_probe *tp, struct ftrace_event_file *file)
  * if the file is NULL, disable "perf" handler, or disable "trace" handler.
  */
 static int
-disable_trace_probe(struct trace_probe *tp, struct ftrace_event_file *file)
+disable_trace_kprobe(struct trace_kprobe *tk, struct ftrace_event_file *file)
 {
 	struct event_file_link *link = NULL;
 	int wait = 0;
 	int ret = 0;
 
 	if (file) {
-		link = find_event_file_link(tp, file);
+		link = find_event_file_link(&tk->tp, file);
 		if (!link) {
 			ret = -EINVAL;
 			goto out;
@@ -256,18 +240,18 @@ disable_trace_probe(struct trace_probe *tp, struct ftrace_event_file *file)
 
 		list_del_rcu(&link->list);
 		wait = 1;
-		if (!list_empty(&tp->files))
+		if (!list_empty(&tk->tp.files))
 			goto out;
 
-		tp->flags &= ~TP_FLAG_TRACE;
+		tk->tp.flags &= ~TP_FLAG_TRACE;
 	} else
-		tp->flags &= ~TP_FLAG_PROFILE;
+		tk->tp.flags &= ~TP_FLAG_PROFILE;
 
-	if (!trace_probe_is_enabled(tp) && trace_probe_is_registered(tp)) {
-		if (trace_probe_is_return(tp))
-			disable_kretprobe(&tp->rp);
+	if (!trace_probe_is_enabled(&tk->tp) && trace_probe_is_registered(&tk->tp)) {
+		if (trace_kprobe_is_return(tk))
+			disable_kretprobe(&tk->rp);
 		else
-			disable_kprobe(&tp->rp.kp);
+			disable_kprobe(&tk->rp.kp);
 		wait = 1;
 	}
  out:
@@ -288,40 +272,40 @@ disable_trace_probe(struct trace_probe *tp, struct ftrace_event_file *file)
 }
 
 /* Internal register function - just handle k*probes and flags */
-static int __register_trace_probe(struct trace_probe *tp)
+static int __register_trace_kprobe(struct trace_kprobe *tk)
 {
 	int i, ret;
 
-	if (trace_probe_is_registered(tp))
+	if (trace_probe_is_registered(&tk->tp))
 		return -EINVAL;
 
-	for (i = 0; i < tp->nr_args; i++)
-		traceprobe_update_arg(&tp->args[i]);
+	for (i = 0; i < tk->tp.nr_args; i++)
+		traceprobe_update_arg(&tk->tp.args[i]);
 
 	/* Set/clear disabled flag according to tp->flag */
-	if (trace_probe_is_enabled(tp))
-		tp->rp.kp.flags &= ~KPROBE_FLAG_DISABLED;
+	if (trace_probe_is_enabled(&tk->tp))
+		tk->rp.kp.flags &= ~KPROBE_FLAG_DISABLED;
 	else
-		tp->rp.kp.flags |= KPROBE_FLAG_DISABLED;
+		tk->rp.kp.flags |= KPROBE_FLAG_DISABLED;
 
-	if (trace_probe_is_return(tp))
-		ret = register_kretprobe(&tp->rp);
+	if (trace_kprobe_is_return(tk))
+		ret = register_kretprobe(&tk->rp);
 	else
-		ret = register_kprobe(&tp->rp.kp);
+		ret = register_kprobe(&tk->rp.kp);
 
 	if (ret == 0)
-		tp->flags |= TP_FLAG_REGISTERED;
+		tk->tp.flags |= TP_FLAG_REGISTERED;
 	else {
 		pr_warning("Could not insert probe at %s+%lu: %d\n",
-			   trace_probe_symbol(tp), trace_probe_offset(tp), ret);
-		if (ret == -ENOENT && trace_probe_is_on_module(tp)) {
+			   trace_kprobe_symbol(tk), trace_kprobe_offset(tk), ret);
+		if (ret == -ENOENT && trace_kprobe_is_on_module(tk)) {
 			pr_warning("This probe might be able to register after"
 				   "target module is loaded. Continue.\n");
 			ret = 0;
 		} else if (ret == -EILSEQ) {
 			pr_warning("Probing address(0x%p) is not an "
 				   "instruction boundary.\n",
-				   tp->rp.kp.addr);
+				   tk->rp.kp.addr);
 			ret = -EINVAL;
 		}
 	}
@@ -330,67 +314,67 @@ static int __register_trace_probe(struct trace_probe *tp)
 }
 
 /* Internal unregister function - just handle k*probes and flags */
-static void __unregister_trace_probe(struct trace_probe *tp)
+static void __unregister_trace_kprobe(struct trace_kprobe *tk)
 {
-	if (trace_probe_is_registered(tp)) {
-		if (trace_probe_is_return(tp))
-			unregister_kretprobe(&tp->rp);
+	if (trace_probe_is_registered(&tk->tp)) {
+		if (trace_kprobe_is_return(tk))
+			unregister_kretprobe(&tk->rp);
 		else
-			unregister_kprobe(&tp->rp.kp);
-		tp->flags &= ~TP_FLAG_REGISTERED;
+			unregister_kprobe(&tk->rp.kp);
+		tk->tp.flags &= ~TP_FLAG_REGISTERED;
 		/* Cleanup kprobe for reuse */
-		if (tp->rp.kp.symbol_name)
-			tp->rp.kp.addr = NULL;
+		if (tk->rp.kp.symbol_name)
+			tk->rp.kp.addr = NULL;
 	}
 }
 
 /* Unregister a trace_probe and probe_event: call with locking probe_lock */
-static int unregister_trace_probe(struct trace_probe *tp)
+static int unregister_trace_kprobe(struct trace_kprobe *tk)
 {
 	/* Enabled event can not be unregistered */
-	if (trace_probe_is_enabled(tp))
+	if (trace_probe_is_enabled(&tk->tp))
 		return -EBUSY;
 
 	/* Will fail if probe is being used by ftrace or perf */
-	if (unregister_probe_event(tp))
+	if (unregister_kprobe_event(tk))
 		return -EBUSY;
 
-	__unregister_trace_probe(tp);
-	list_del(&tp->list);
+	__unregister_trace_kprobe(tk);
+	list_del(&tk->list);
 
 	return 0;
 }
 
 /* Register a trace_probe and probe_event */
-static int register_trace_probe(struct trace_probe *tp)
+static int register_trace_kprobe(struct trace_kprobe *tk)
 {
-	struct trace_probe *old_tp;
+	struct trace_kprobe *old_tk;
 	int ret;
 
 	mutex_lock(&probe_lock);
 
 	/* Delete old (same name) event if exist */
-	old_tp = find_trace_probe(tp->call.name, tp->call.class->system);
-	if (old_tp) {
-		ret = unregister_trace_probe(old_tp);
+	old_tk = find_trace_kprobe(tk->tp.call.name, tk->tp.call.class->system);
+	if (old_tk) {
+		ret = unregister_trace_kprobe(old_tk);
 		if (ret < 0)
 			goto end;
-		free_trace_probe(old_tp);
+		free_trace_kprobe(old_tk);
 	}
 
 	/* Register new event */
-	ret = register_probe_event(tp);
+	ret = register_kprobe_event(tk);
 	if (ret) {
 		pr_warning("Failed to register probe event(%d)\n", ret);
 		goto end;
 	}
 
 	/* Register k*probe */
-	ret = __register_trace_probe(tp);
+	ret = __register_trace_kprobe(tk);
 	if (ret < 0)
-		unregister_probe_event(tp);
+		unregister_kprobe_event(tk);
 	else
-		list_add_tail(&tp->list, &probe_list);
+		list_add_tail(&tk->list, &probe_list);
 
 end:
 	mutex_unlock(&probe_lock);
@@ -398,11 +382,11 @@ end:
 }
 
 /* Module notifier call back, checking event on the module */
-static int trace_probe_module_callback(struct notifier_block *nb,
+static int trace_kprobe_module_callback(struct notifier_block *nb,
 				       unsigned long val, void *data)
 {
 	struct module *mod = data;
-	struct trace_probe *tp;
+	struct trace_kprobe *tk;
 	int ret;
 
 	if (val != MODULE_STATE_COMING)
@@ -410,15 +394,15 @@ static int trace_probe_module_callback(struct notifier_block *nb,
 
 	/* Update probes on coming module */
 	mutex_lock(&probe_lock);
-	list_for_each_entry(tp, &probe_list, list) {
-		if (trace_probe_within_module(tp, mod)) {
+	list_for_each_entry(tk, &probe_list, list) {
+		if (trace_kprobe_within_module(tk, mod)) {
 			/* Don't need to check busy - this should have gone. */
-			__unregister_trace_probe(tp);
-			ret = __register_trace_probe(tp);
+			__unregister_trace_kprobe(tk);
+			ret = __register_trace_kprobe(tk);
 			if (ret)
 				pr_warning("Failed to re-register probe %s on"
 					   "%s: %d\n",
-					   tp->call.name, mod->name, ret);
+					   tk->tp.call.name, mod->name, ret);
 		}
 	}
 	mutex_unlock(&probe_lock);
@@ -426,12 +410,12 @@ static int trace_probe_module_callback(struct notifier_block *nb,
 	return NOTIFY_DONE;
 }
 
-static struct notifier_block trace_probe_module_nb = {
-	.notifier_call = trace_probe_module_callback,
+static struct notifier_block trace_kprobe_module_nb = {
+	.notifier_call = trace_kprobe_module_callback,
 	.priority = 1	/* Invoked after kprobe module callback */
 };
 
-static int create_trace_probe(int argc, char **argv)
+static int create_trace_kprobe(int argc, char **argv)
 {
 	/*
 	 * Argument syntax:
@@ -451,7 +435,7 @@ static int create_trace_probe(int argc, char **argv)
 	 * Type of args:
 	 *  FETCHARG:TYPE : use TYPE instead of unsigned long.
 	 */
-	struct trace_probe *tp;
+	struct trace_kprobe *tk;
 	int i, ret = 0;
 	bool is_return = false, is_delete = false;
 	char *symbol = NULL, *event = NULL, *group = NULL;
@@ -498,16 +482,16 @@ static int create_trace_probe(int argc, char **argv)
 			return -EINVAL;
 		}
 		mutex_lock(&probe_lock);
-		tp = find_trace_probe(event, group);
-		if (!tp) {
+		tk = find_trace_kprobe(event, group);
+		if (!tk) {
 			mutex_unlock(&probe_lock);
 			pr_info("Event %s/%s doesn't exist.\n", group, event);
 			return -ENOENT;
 		}
 		/* delete an event */
-		ret = unregister_trace_probe(tp);
+		ret = unregister_trace_kprobe(tk);
 		if (ret == 0)
-			free_trace_probe(tp);
+			free_trace_kprobe(tk);
 		mutex_unlock(&probe_lock);
 		return ret;
 	}
@@ -554,47 +538,49 @@ static int create_trace_probe(int argc, char **argv)
 				 is_return ? 'r' : 'p', addr);
 		event = buf;
 	}
-	tp = alloc_trace_probe(group, event, addr, symbol, offset, argc,
+	tk = alloc_trace_kprobe(group, event, addr, symbol, offset, argc,
 			       is_return);
-	if (IS_ERR(tp)) {
+	if (IS_ERR(tk)) {
 		pr_info("Failed to allocate trace_probe.(%d)\n",
-			(int)PTR_ERR(tp));
-		return PTR_ERR(tp);
+			(int)PTR_ERR(tk));
+		return PTR_ERR(tk);
 	}
 
 	/* parse arguments */
 	ret = 0;
 	for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
+		struct probe_arg *parg = &tk->tp.args[i];
+
 		/* Increment count for freeing args in error case */
-		tp->nr_args++;
+		tk->tp.nr_args++;
 
 		/* Parse argument name */
 		arg = strchr(argv[i], '=');
 		if (arg) {
 			*arg++ = '\0';
-			tp->args[i].name = kstrdup(argv[i], GFP_KERNEL);
+			parg->name = kstrdup(argv[i], GFP_KERNEL);
 		} else {
 			arg = argv[i];
 			/* If argument name is omitted, set "argN" */
 			snprintf(buf, MAX_EVENT_NAME_LEN, "arg%d", i + 1);
-			tp->args[i].name = kstrdup(buf, GFP_KERNEL);
+			parg->name = kstrdup(buf, GFP_KERNEL);
 		}
 
-		if (!tp->args[i].name) {
+		if (!parg->name) {
 			pr_info("Failed to allocate argument[%d] name.\n", i);
 			ret = -ENOMEM;
 			goto error;
 		}
 
-		if (!is_good_name(tp->args[i].name)) {
+		if (!is_good_name(parg->name)) {
 			pr_info("Invalid argument[%d] name: %s\n",
-				i, tp->args[i].name);
+				i, parg->name);
 			ret = -EINVAL;
 			goto error;
 		}
 
-		if (traceprobe_conflict_field_name(tp->args[i].name,
-							tp->args, i)) {
+		if (traceprobe_conflict_field_name(parg->name,
+							tk->tp.args, i)) {
 			pr_info("Argument[%d] name '%s' conflicts with "
 				"another field.\n", i, argv[i]);
 			ret = -EINVAL;
@@ -602,7 +588,7 @@ static int create_trace_probe(int argc, char **argv)
 		}
 
 		/* Parse fetch argument */
-		ret = traceprobe_parse_probe_arg(arg, &tp->size, &tp->args[i],
+		ret = traceprobe_parse_probe_arg(arg, &tk->tp.size, parg,
 						is_return, true);
 		if (ret) {
 			pr_info("Parse error at argument[%d]. (%d)\n", i, ret);
@@ -610,35 +596,35 @@ static int create_trace_probe(int argc, char **argv)
 		}
 	}
 
-	ret = register_trace_probe(tp);
+	ret = register_trace_kprobe(tk);
 	if (ret)
 		goto error;
 	return 0;
 
 error:
-	free_trace_probe(tp);
+	free_trace_kprobe(tk);
 	return ret;
 }
 
-static int release_all_trace_probes(void)
+static int release_all_trace_kprobes(void)
 {
-	struct trace_probe *tp;
+	struct trace_kprobe *tk;
 	int ret = 0;
 
 	mutex_lock(&probe_lock);
 	/* Ensure no probe is in use. */
-	list_for_each_entry(tp, &probe_list, list)
-		if (trace_probe_is_enabled(tp)) {
+	list_for_each_entry(tk, &probe_list, list)
+		if (trace_probe_is_enabled(&tk->tp)) {
 			ret = -EBUSY;
 			goto end;
 		}
 	/* TODO: Use batch unregistration */
 	while (!list_empty(&probe_list)) {
-		tp = list_entry(probe_list.next, struct trace_probe, list);
-		ret = unregister_trace_probe(tp);
+		tk = list_entry(probe_list.next, struct trace_kprobe, list);
+		ret = unregister_trace_kprobe(tk);
 		if (ret)
 			goto end;
-		free_trace_probe(tp);
+		free_trace_kprobe(tk);
 	}
 
 end:
@@ -666,22 +652,22 @@ static void probes_seq_stop(struct seq_file *m, void *v)
 
 static int probes_seq_show(struct seq_file *m, void *v)
 {
-	struct trace_probe *tp = v;
+	struct trace_kprobe *tk = v;
 	int i;
 
-	seq_printf(m, "%c", trace_probe_is_return(tp) ? 'r' : 'p');
-	seq_printf(m, ":%s/%s", tp->call.class->system, tp->call.name);
+	seq_printf(m, "%c", trace_kprobe_is_return(tk) ? 'r' : 'p');
+	seq_printf(m, ":%s/%s", tk->tp.call.class->system, tk->tp.call.name);
 
-	if (!tp->symbol)
-		seq_printf(m, " 0x%p", tp->rp.kp.addr);
-	else if (tp->rp.kp.offset)
-		seq_printf(m, " %s+%u", trace_probe_symbol(tp),
-			   tp->rp.kp.offset);
+	if (!tk->symbol)
+		seq_printf(m, " 0x%p", tk->rp.kp.addr);
+	else if (tk->rp.kp.offset)
+		seq_printf(m, " %s+%u", trace_kprobe_symbol(tk),
+			   tk->rp.kp.offset);
 	else
-		seq_printf(m, " %s", trace_probe_symbol(tp));
+		seq_printf(m, " %s", trace_kprobe_symbol(tk));
 
-	for (i = 0; i < tp->nr_args; i++)
-		seq_printf(m, " %s=%s", tp->args[i].name, tp->args[i].comm);
+	for (i = 0; i < tk->tp.nr_args; i++)
+		seq_printf(m, " %s=%s", tk->tp.args[i].name, tk->tp.args[i].comm);
 	seq_printf(m, "\n");
 
 	return 0;
@@ -699,7 +685,7 @@ static int probes_open(struct inode *inode, struct file *file)
 	int ret;
 
 	if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) {
-		ret = release_all_trace_probes();
+		ret = release_all_trace_kprobes();
 		if (ret < 0)
 			return ret;
 	}
@@ -711,7 +697,7 @@ static ssize_t probes_write(struct file *file, const char __user *buffer,
 			    size_t count, loff_t *ppos)
 {
 	return traceprobe_probes_write(file, buffer, count, ppos,
-			create_trace_probe);
+			create_trace_kprobe);
 }
 
 static const struct file_operations kprobe_events_ops = {
@@ -726,10 +712,10 @@ static const struct file_operations kprobe_events_ops = {
 /* Probes profiling interfaces */
 static int probes_profile_seq_show(struct seq_file *m, void *v)
 {
-	struct trace_probe *tp = v;
+	struct trace_kprobe *tk = v;
 
-	seq_printf(m, "  %-44s %15lu %15lu\n", tp->call.name, tp->nhit,
-		   tp->rp.kp.nmissed);
+	seq_printf(m, "  %-44s %15lu %15lu\n", tk->tp.call.name, tk->nhit,
+		   tk->rp.kp.nmissed);
 
 	return 0;
 }
@@ -804,7 +790,7 @@ static __kprobes void store_trace_args(int ent_size, struct trace_probe *tp,
 
 /* Kprobe handler */
 static __kprobes void
-__kprobe_trace_func(struct trace_probe *tp, struct pt_regs *regs,
+__kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs,
 		    struct ftrace_event_file *ftrace_file)
 {
 	struct kprobe_trace_entry_head *entry;
@@ -812,7 +798,7 @@ __kprobe_trace_func(struct trace_probe *tp, struct pt_regs *regs,
 	struct ring_buffer *buffer;
 	int size, dsize, pc;
 	unsigned long irq_flags;
-	struct ftrace_event_call *call = &tp->call;
+	struct ftrace_event_call *call = &tk->tp.call;
 
 	WARN_ON(call != ftrace_file->event_call);
 
@@ -822,8 +808,8 @@ __kprobe_trace_func(struct trace_probe *tp, struct pt_regs *regs,
 	local_save_flags(irq_flags);
 	pc = preempt_count();
 
-	dsize = __get_data_size(tp, regs);
-	size = sizeof(*entry) + tp->size + dsize;
+	dsize = __get_data_size(&tk->tp, regs);
+	size = sizeof(*entry) + tk->tp.size + dsize;
 
 	event = trace_event_buffer_lock_reserve(&buffer, ftrace_file,
 						call->event.type,
@@ -832,8 +818,8 @@ __kprobe_trace_func(struct trace_probe *tp, struct pt_regs *regs,
 		return;
 
 	entry = ring_buffer_event_data(event);
-	entry->ip = (unsigned long)tp->rp.kp.addr;
-	store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
+	entry->ip = (unsigned long)tk->rp.kp.addr;
+	store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize);
 
 	if (!filter_check_discard(ftrace_file, entry, buffer, event))
 		trace_buffer_unlock_commit_regs(buffer, event,
@@ -841,17 +827,17 @@ __kprobe_trace_func(struct trace_probe *tp, struct pt_regs *regs,
 }
 
 static __kprobes void
-kprobe_trace_func(struct trace_probe *tp, struct pt_regs *regs)
+kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs)
 {
 	struct event_file_link *link;
 
-	list_for_each_entry_rcu(link, &tp->files, list)
-		__kprobe_trace_func(tp, regs, link->file);
+	list_for_each_entry_rcu(link, &tk->tp.files, list)
+		__kprobe_trace_func(tk, regs, link->file);
 }
 
 /* Kretprobe handler */
 static __kprobes void
-__kretprobe_trace_func(struct trace_probe *tp, struct kretprobe_instance *ri,
+__kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,
 		       struct pt_regs *regs,
 		       struct ftrace_event_file *ftrace_file)
 {
@@ -860,7 +846,7 @@ __kretprobe_trace_func(struct trace_probe *tp, struct kretprobe_instance *ri,
 	struct ring_buffer *buffer;
 	int size, pc, dsize;
 	unsigned long irq_flags;
-	struct ftrace_event_call *call = &tp->call;
+	struct ftrace_event_call *call = &tk->tp.call;
 
 	WARN_ON(call != ftrace_file->event_call);
 
@@ -870,8 +856,8 @@ __kretprobe_trace_func(struct trace_probe *tp, struct kretprobe_instance *ri,
 	local_save_flags(irq_flags);
 	pc = preempt_count();
 
-	dsize = __get_data_size(tp, regs);
-	size = sizeof(*entry) + tp->size + dsize;
+	dsize = __get_data_size(&tk->tp, regs);
+	size = sizeof(*entry) + tk->tp.size + dsize;
 
 	event = trace_event_buffer_lock_reserve(&buffer, ftrace_file,
 						call->event.type,
@@ -880,9 +866,9 @@ __kretprobe_trace_func(struct trace_probe *tp, struct kretprobe_instance *ri,
 		return;
 
 	entry = ring_buffer_event_data(event);
-	entry->func = (unsigned long)tp->rp.kp.addr;
+	entry->func = (unsigned long)tk->rp.kp.addr;
 	entry->ret_ip = (unsigned long)ri->ret_addr;
-	store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
+	store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize);
 
 	if (!filter_check_discard(ftrace_file, entry, buffer, event))
 		trace_buffer_unlock_commit_regs(buffer, event,
@@ -890,13 +876,13 @@ __kretprobe_trace_func(struct trace_probe *tp, struct kretprobe_instance *ri,
 }
 
 static __kprobes void
-kretprobe_trace_func(struct trace_probe *tp, struct kretprobe_instance *ri,
+kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,
 		     struct pt_regs *regs)
 {
 	struct event_file_link *link;
 
-	list_for_each_entry_rcu(link, &tp->files, list)
-		__kretprobe_trace_func(tp, ri, regs, link->file);
+	list_for_each_entry_rcu(link, &tk->tp.files, list)
+		__kretprobe_trace_func(tk, ri, regs, link->file);
 }
 
 /* Event entry printers */
@@ -983,16 +969,18 @@ static int kprobe_event_define_fields(struct ftrace_event_call *event_call)
 {
 	int ret, i;
 	struct kprobe_trace_entry_head field;
-	struct trace_probe *tp = (struct trace_probe *)event_call->data;
+	struct trace_kprobe *tk = (struct trace_kprobe *)event_call->data;
 
 	DEFINE_FIELD(unsigned long, ip, FIELD_STRING_IP, 0);
 	/* Set argument names as fields */
-	for (i = 0; i < tp->nr_args; i++) {
-		ret = trace_define_field(event_call, tp->args[i].type->fmttype,
-					 tp->args[i].name,
-					 sizeof(field) + tp->args[i].offset,
-					 tp->args[i].type->size,
-					 tp->args[i].type->is_signed,
+	for (i = 0; i < tk->tp.nr_args; i++) {
+		struct probe_arg *parg = &tk->tp.args[i];
+
+		ret = trace_define_field(event_call, parg->type->fmttype,
+					 parg->name,
+					 sizeof(field) + parg->offset,
+					 parg->type->size,
+					 parg->type->is_signed,
 					 FILTER_OTHER);
 		if (ret)
 			return ret;
@@ -1004,17 +992,19 @@ static int kretprobe_event_define_fields(struct ftrace_event_call *event_call)
 {
 	int ret, i;
 	struct kretprobe_trace_entry_head field;
-	struct trace_probe *tp = (struct trace_probe *)event_call->data;
+	struct trace_kprobe *tk = (struct trace_kprobe *)event_call->data;
 
 	DEFINE_FIELD(unsigned long, func, FIELD_STRING_FUNC, 0);
 	DEFINE_FIELD(unsigned long, ret_ip, FIELD_STRING_RETIP, 0);
 	/* Set argument names as fields */
-	for (i = 0; i < tp->nr_args; i++) {
-		ret = trace_define_field(event_call, tp->args[i].type->fmttype,
-					 tp->args[i].name,
-					 sizeof(field) + tp->args[i].offset,
-					 tp->args[i].type->size,
-					 tp->args[i].type->is_signed,
+	for (i = 0; i < tk->tp.nr_args; i++) {
+		struct probe_arg *parg = &tk->tp.args[i];
+
+		ret = trace_define_field(event_call, parg->type->fmttype,
+					 parg->name,
+					 sizeof(field) + parg->offset,
+					 parg->type->size,
+					 parg->type->is_signed,
 					 FILTER_OTHER);
 		if (ret)
 			return ret;
@@ -1022,14 +1012,14 @@ static int kretprobe_event_define_fields(struct ftrace_event_call *event_call)
 	return 0;
 }
 
-static int __set_print_fmt(struct trace_probe *tp, char *buf, int len)
+static int __set_print_fmt(struct trace_kprobe *tk, char *buf, int len)
 {
 	int i;
 	int pos = 0;
 
 	const char *fmt, *arg;
 
-	if (!trace_probe_is_return(tp)) {
+	if (!trace_kprobe_is_return(tk)) {
 		fmt = "(%lx)";
 		arg = "REC->" FIELD_STRING_IP;
 	} else {
@@ -1042,21 +1032,21 @@ static int __set_print_fmt(struct trace_probe *tp, char *buf, int len)
 
 	pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt);
 
-	for (i = 0; i < tp->nr_args; i++) {
+	for (i = 0; i < tk->tp.nr_args; i++) {
 		pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=%s",
-				tp->args[i].name, tp->args[i].type->fmt);
+				tk->tp.args[i].name, tk->tp.args[i].type->fmt);
 	}
 
 	pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg);
 
-	for (i = 0; i < tp->nr_args; i++) {
-		if (strcmp(tp->args[i].type->name, "string") == 0)
+	for (i = 0; i < tk->tp.nr_args; i++) {
+		if (strcmp(tk->tp.args[i].type->name, "string") == 0)
 			pos += snprintf(buf + pos, LEN_OR_ZERO,
 					", __get_str(%s)",
-					tp->args[i].name);
+					tk->tp.args[i].name);
 		else
 			pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
-					tp->args[i].name);
+					tk->tp.args[i].name);
 	}
 
 #undef LEN_OR_ZERO
@@ -1065,20 +1055,20 @@ static int __set_print_fmt(struct trace_probe *tp, char *buf, int len)
 	return pos;
 }
 
-static int set_print_fmt(struct trace_probe *tp)
+static int set_print_fmt(struct trace_kprobe *tk)
 {
 	int len;
 	char *print_fmt;
 
 	/* First: called with 0 length to calculate the needed length */
-	len = __set_print_fmt(tp, NULL, 0);
+	len = __set_print_fmt(tk, NULL, 0);
 	print_fmt = kmalloc(len + 1, GFP_KERNEL);
 	if (!print_fmt)
 		return -ENOMEM;
 
 	/* Second: actually write the @print_fmt */
-	__set_print_fmt(tp, print_fmt, len + 1);
-	tp->call.print_fmt = print_fmt;
+	__set_print_fmt(tk, print_fmt, len + 1);
+	tk->tp.call.print_fmt = print_fmt;
 
 	return 0;
 }
@@ -1087,9 +1077,9 @@ static int set_print_fmt(struct trace_probe *tp)
 
 /* Kprobe profile handler */
 static __kprobes void
-kprobe_perf_func(struct trace_probe *tp, struct pt_regs *regs)
+kprobe_perf_func(struct trace_kprobe *tk, struct pt_regs *regs)
 {
-	struct ftrace_event_call *call = &tp->call;
+	struct ftrace_event_call *call = &tk->tp.call;
 	struct kprobe_trace_entry_head *entry;
 	struct hlist_head *head;
 	int size, __size, dsize;
@@ -1099,8 +1089,8 @@ kprobe_perf_func(struct trace_probe *tp, struct pt_regs *regs)
 	if (hlist_empty(head))
 		return;
 
-	dsize = __get_data_size(tp, regs);
-	__size = sizeof(*entry) + tp->size + dsize;
+	dsize = __get_data_size(&tk->tp, regs);
+	__size = sizeof(*entry) + tk->tp.size + dsize;
 	size = ALIGN(__size + sizeof(u32), sizeof(u64));
 	size -= sizeof(u32);
 
@@ -1108,18 +1098,18 @@ kprobe_perf_func(struct trace_probe *tp, struct pt_regs *regs)
 	if (!entry)
 		return;
 
-	entry->ip = (unsigned long)tp->rp.kp.addr;
+	entry->ip = (unsigned long)tk->rp.kp.addr;
 	memset(&entry[1], 0, dsize);
-	store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
+	store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize);
 	perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL);
 }
 
 /* Kretprobe profile handler */
 static __kprobes void
-kretprobe_perf_func(struct trace_probe *tp, struct kretprobe_instance *ri,
+kretprobe_perf_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,
 		    struct pt_regs *regs)
 {
-	struct ftrace_event_call *call = &tp->call;
+	struct ftrace_event_call *call = &tk->tp.call;
 	struct kretprobe_trace_entry_head *entry;
 	struct hlist_head *head;
 	int size, __size, dsize;
@@ -1129,8 +1119,8 @@ kretprobe_perf_func(struct trace_probe *tp, struct kretprobe_instance *ri,
 	if (hlist_empty(head))
 		return;
 
-	dsize = __get_data_size(tp, regs);
-	__size = sizeof(*entry) + tp->size + dsize;
+	dsize = __get_data_size(&tk->tp, regs);
+	__size = sizeof(*entry) + tk->tp.size + dsize;
 	size = ALIGN(__size + sizeof(u32), sizeof(u64));
 	size -= sizeof(u32);
 
@@ -1138,9 +1128,9 @@ kretprobe_perf_func(struct trace_probe *tp, struct kretprobe_instance *ri,
 	if (!entry)
 		return;
 
-	entry->func = (unsigned long)tp->rp.kp.addr;
+	entry->func = (unsigned long)tk->rp.kp.addr;
 	entry->ret_ip = (unsigned long)ri->ret_addr;
-	store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
+	store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize);
 	perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL);
 }
 #endif	/* CONFIG_PERF_EVENTS */
@@ -1155,20 +1145,20 @@ static __kprobes
 int kprobe_register(struct ftrace_event_call *event,
 		    enum trace_reg type, void *data)
 {
-	struct trace_probe *tp = (struct trace_probe *)event->data;
+	struct trace_kprobe *tk = (struct trace_kprobe *)event->data;
 	struct ftrace_event_file *file = data;
 
 	switch (type) {
 	case TRACE_REG_REGISTER:
-		return enable_trace_probe(tp, file);
+		return enable_trace_kprobe(tk, file);
 	case TRACE_REG_UNREGISTER:
-		return disable_trace_probe(tp, file);
+		return disable_trace_kprobe(tk, file);
 
 #ifdef CONFIG_PERF_EVENTS
 	case TRACE_REG_PERF_REGISTER:
-		return enable_trace_probe(tp, NULL);
+		return enable_trace_kprobe(tk, NULL);
 	case TRACE_REG_PERF_UNREGISTER:
-		return disable_trace_probe(tp, NULL);
+		return disable_trace_kprobe(tk, NULL);
 	case TRACE_REG_PERF_OPEN:
 	case TRACE_REG_PERF_CLOSE:
 	case TRACE_REG_PERF_ADD:
@@ -1182,15 +1172,15 @@ int kprobe_register(struct ftrace_event_call *event,
 static __kprobes
 int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs)
 {
-	struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp);
+	struct trace_kprobe *tk = container_of(kp, struct trace_kprobe, rp.kp);
 
-	tp->nhit++;
+	tk->nhit++;
 
-	if (tp->flags & TP_FLAG_TRACE)
-		kprobe_trace_func(tp, regs);
+	if (tk->tp.flags & TP_FLAG_TRACE)
+		kprobe_trace_func(tk, regs);
 #ifdef CONFIG_PERF_EVENTS
-	if (tp->flags & TP_FLAG_PROFILE)
-		kprobe_perf_func(tp, regs);
+	if (tk->tp.flags & TP_FLAG_PROFILE)
+		kprobe_perf_func(tk, regs);
 #endif
 	return 0;	/* We don't tweek kernel, so just return 0 */
 }
@@ -1198,15 +1188,15 @@ int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs)
 static __kprobes
 int kretprobe_dispatcher(struct kretprobe_instance *ri, struct pt_regs *regs)
 {
-	struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp);
+	struct trace_kprobe *tk = container_of(ri->rp, struct trace_kprobe, rp);
 
-	tp->nhit++;
+	tk->nhit++;
 
-	if (tp->flags & TP_FLAG_TRACE)
-		kretprobe_trace_func(tp, ri, regs);
+	if (tk->tp.flags & TP_FLAG_TRACE)
+		kretprobe_trace_func(tk, ri, regs);
 #ifdef CONFIG_PERF_EVENTS
-	if (tp->flags & TP_FLAG_PROFILE)
-		kretprobe_perf_func(tp, ri, regs);
+	if (tk->tp.flags & TP_FLAG_PROFILE)
+		kretprobe_perf_func(tk, ri, regs);
 #endif
 	return 0;	/* We don't tweek kernel, so just return 0 */
 }
@@ -1219,21 +1209,21 @@ static struct trace_event_functions kprobe_funcs = {
 	.trace		= print_kprobe_event
 };
 
-static int register_probe_event(struct trace_probe *tp)
+static int register_kprobe_event(struct trace_kprobe *tk)
 {
-	struct ftrace_event_call *call = &tp->call;
+	struct ftrace_event_call *call = &tk->tp.call;
 	int ret;
 
 	/* Initialize ftrace_event_call */
 	INIT_LIST_HEAD(&call->class->fields);
-	if (trace_probe_is_return(tp)) {
+	if (trace_kprobe_is_return(tk)) {
 		call->event.funcs = &kretprobe_funcs;
 		call->class->define_fields = kretprobe_event_define_fields;
 	} else {
 		call->event.funcs = &kprobe_funcs;
 		call->class->define_fields = kprobe_event_define_fields;
 	}
-	if (set_print_fmt(tp) < 0)
+	if (set_print_fmt(tk) < 0)
 		return -ENOMEM;
 	ret = register_ftrace_event(&call->event);
 	if (!ret) {
@@ -1242,7 +1232,7 @@ static int register_probe_event(struct trace_probe *tp)
 	}
 	call->flags = 0;
 	call->class->reg = kprobe_register;
-	call->data = tp;
+	call->data = tk;
 	ret = trace_add_event_call(call);
 	if (ret) {
 		pr_info("Failed to register kprobe event: %s\n", call->name);
@@ -1252,14 +1242,14 @@ static int register_probe_event(struct trace_probe *tp)
 	return ret;
 }
 
-static int unregister_probe_event(struct trace_probe *tp)
+static int unregister_kprobe_event(struct trace_kprobe *tk)
 {
 	int ret;
 
 	/* tp->event is unregistered in trace_remove_event_call() */
-	ret = trace_remove_event_call(&tp->call);
+	ret = trace_remove_event_call(&tk->tp.call);
 	if (!ret)
-		kfree(tp->call.print_fmt);
+		kfree(tk->tp.call.print_fmt);
 	return ret;
 }
 
@@ -1269,7 +1259,7 @@ static __init int init_kprobe_trace(void)
 	struct dentry *d_tracer;
 	struct dentry *entry;
 
-	if (register_module_notifier(&trace_probe_module_nb))
+	if (register_module_notifier(&trace_kprobe_module_nb))
 		return -EINVAL;
 
 	d_tracer = tracing_init_dentry();
@@ -1309,26 +1299,26 @@ static __used int kprobe_trace_selftest_target(int a1, int a2, int a3,
 }
 
 static struct ftrace_event_file *
-find_trace_probe_file(struct trace_probe *tp, struct trace_array *tr)
+find_trace_probe_file(struct trace_kprobe *tk, struct trace_array *tr)
 {
 	struct ftrace_event_file *file;
 
 	list_for_each_entry(file, &tr->events, list)
-		if (file->event_call == &tp->call)
+		if (file->event_call == &tk->tp.call)
 			return file;
 
 	return NULL;
 }
 
 /*
- * Nobody but us can call enable_trace_probe/disable_trace_probe at this
+ * Nobody but us can call enable_trace_kprobe/disable_trace_kprobe at this
  * stage, we can do this lockless.
  */
 static __init int kprobe_trace_self_tests_init(void)
 {
 	int ret, warn = 0;
 	int (*target)(int, int, int, int, int, int);
-	struct trace_probe *tp;
+	struct trace_kprobe *tk;
 	struct ftrace_event_file *file;
 
 	target = kprobe_trace_selftest_target;
@@ -1337,44 +1327,44 @@ static __init int kprobe_trace_self_tests_init(void)
 
 	ret = traceprobe_command("p:testprobe kprobe_trace_selftest_target "
 				  "$stack $stack0 +0($stack)",
-				  create_trace_probe);
+				  create_trace_kprobe);
 	if (WARN_ON_ONCE(ret)) {
 		pr_warn("error on probing function entry.\n");
 		warn++;
 	} else {
 		/* Enable trace point */
-		tp = find_trace_probe("testprobe", KPROBE_EVENT_SYSTEM);
-		if (WARN_ON_ONCE(tp == NULL)) {
+		tk = find_trace_kprobe("testprobe", KPROBE_EVENT_SYSTEM);
+		if (WARN_ON_ONCE(tk == NULL)) {
 			pr_warn("error on getting new probe.\n");
 			warn++;
 		} else {
-			file = find_trace_probe_file(tp, top_trace_array());
+			file = find_trace_probe_file(tk, top_trace_array());
 			if (WARN_ON_ONCE(file == NULL)) {
 				pr_warn("error on getting probe file.\n");
 				warn++;
 			} else
-				enable_trace_probe(tp, file);
+				enable_trace_kprobe(tk, file);
 		}
 	}
 
 	ret = traceprobe_command("r:testprobe2 kprobe_trace_selftest_target "
-				  "$retval", create_trace_probe);
+				  "$retval", create_trace_kprobe);
 	if (WARN_ON_ONCE(ret)) {
 		pr_warn("error on probing function return.\n");
 		warn++;
 	} else {
 		/* Enable trace point */
-		tp = find_trace_probe("testprobe2", KPROBE_EVENT_SYSTEM);
-		if (WARN_ON_ONCE(tp == NULL)) {
+		tk = find_trace_kprobe("testprobe2", KPROBE_EVENT_SYSTEM);
+		if (WARN_ON_ONCE(tk == NULL)) {
 			pr_warn("error on getting 2nd new probe.\n");
 			warn++;
 		} else {
-			file = find_trace_probe_file(tp, top_trace_array());
+			file = find_trace_probe_file(tk, top_trace_array());
 			if (WARN_ON_ONCE(file == NULL)) {
 				pr_warn("error on getting probe file.\n");
 				warn++;
 			} else
-				enable_trace_probe(tp, file);
+				enable_trace_kprobe(tk, file);
 		}
 	}
 
@@ -1384,46 +1374,46 @@ static __init int kprobe_trace_self_tests_init(void)
 	ret = target(1, 2, 3, 4, 5, 6);
 
 	/* Disable trace points before removing it */
-	tp = find_trace_probe("testprobe", KPROBE_EVENT_SYSTEM);
-	if (WARN_ON_ONCE(tp == NULL)) {
+	tk = find_trace_kprobe("testprobe", KPROBE_EVENT_SYSTEM);
+	if (WARN_ON_ONCE(tk == NULL)) {
 		pr_warn("error on getting test probe.\n");
 		warn++;
 	} else {
-		file = find_trace_probe_file(tp, top_trace_array());
+		file = find_trace_probe_file(tk, top_trace_array());
 		if (WARN_ON_ONCE(file == NULL)) {
 			pr_warn("error on getting probe file.\n");
 			warn++;
 		} else
-			disable_trace_probe(tp, file);
+			disable_trace_kprobe(tk, file);
 	}
 
-	tp = find_trace_probe("testprobe2", KPROBE_EVENT_SYSTEM);
-	if (WARN_ON_ONCE(tp == NULL)) {
+	tk = find_trace_kprobe("testprobe2", KPROBE_EVENT_SYSTEM);
+	if (WARN_ON_ONCE(tk == NULL)) {
 		pr_warn("error on getting 2nd test probe.\n");
 		warn++;
 	} else {
-		file = find_trace_probe_file(tp, top_trace_array());
+		file = find_trace_probe_file(tk, top_trace_array());
 		if (WARN_ON_ONCE(file == NULL)) {
 			pr_warn("error on getting probe file.\n");
 			warn++;
 		} else
-			disable_trace_probe(tp, file);
+			disable_trace_kprobe(tk, file);
 	}
 
-	ret = traceprobe_command("-:testprobe", create_trace_probe);
+	ret = traceprobe_command("-:testprobe", create_trace_kprobe);
 	if (WARN_ON_ONCE(ret)) {
 		pr_warn("error on deleting a probe.\n");
 		warn++;
 	}
 
-	ret = traceprobe_command("-:testprobe2", create_trace_probe);
+	ret = traceprobe_command("-:testprobe2", create_trace_kprobe);
 	if (WARN_ON_ONCE(ret)) {
 		pr_warn("error on deleting a probe.\n");
 		warn++;
 	}
 
 end:
-	release_all_trace_probes();
+	release_all_trace_kprobes();
 	if (warn)
 		pr_cont("NG: Some tests are failed. Please check them.\n");
 	else
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index 5c7e09d..984e91e 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -124,6 +124,26 @@ struct probe_arg {
 	const struct fetch_type	*type;	/* Type of this argument */
 };
 
+struct trace_probe {
+	unsigned int			flags;	/* For TP_FLAG_* */
+	struct ftrace_event_class	class;
+	struct ftrace_event_call	call;
+	struct list_head 		files;
+	ssize_t				size;	/* trace entry size */
+	unsigned int			nr_args;
+	struct probe_arg		args[];
+};
+
+static inline bool trace_probe_is_enabled(struct trace_probe *tp)
+{
+	return !!(tp->flags & (TP_FLAG_TRACE | TP_FLAG_PROFILE));
+}
+
+static inline bool trace_probe_is_registered(struct trace_probe *tp)
+{
+	return !!(tp->flags & TP_FLAG_REGISTERED);
+}
+
 static inline __kprobes void call_fetch(struct fetch_param *fprm,
 				 struct pt_regs *regs, void *dest)
 {
-- 
1.8.4.3

[for-next][PATCH 04/17] tracing/uprobes: Convert to struct trace_probe

[Steven Rostedt]

[-- Attachment #1: 0004-tracing-uprobes-Convert-to-struct-trace_probe.patch --]
[-- Type: text/plain, Size: 14166 bytes --]

From: Namhyung Kim <namhyung.kim@lge.com>

Convert struct trace_uprobe to make use of the common trace_probe
structure.

Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 kernel/trace/trace_uprobe.c | 159 ++++++++++++++++++++++----------------------
 1 file changed, 79 insertions(+), 80 deletions(-)

diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index c77b92d..afda372 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -51,22 +51,17 @@ struct trace_uprobe_filter {
  */
 struct trace_uprobe {
 	struct list_head		list;
-	struct ftrace_event_class	class;
-	struct ftrace_event_call	call;
 	struct trace_uprobe_filter	filter;
 	struct uprobe_consumer		consumer;
 	struct inode			*inode;
 	char				*filename;
 	unsigned long			offset;
 	unsigned long			nhit;
-	unsigned int			flags;	/* For TP_FLAG_* */
-	ssize_t				size;	/* trace entry size */
-	unsigned int			nr_args;
-	struct probe_arg		args[];
+	struct trace_probe		tp;
 };
 
-#define SIZEOF_TRACE_UPROBE(n)			\
-	(offsetof(struct trace_uprobe, args) +	\
+#define SIZEOF_TRACE_UPROBE(n)				\
+	(offsetof(struct trace_uprobe, tp.args) +	\
 	(sizeof(struct probe_arg) * (n)))
 
 static int register_uprobe_event(struct trace_uprobe *tu);
@@ -114,13 +109,13 @@ alloc_trace_uprobe(const char *group, const char *event, int nargs, bool is_ret)
 	if (!tu)
 		return ERR_PTR(-ENOMEM);
 
-	tu->call.class = &tu->class;
-	tu->call.name = kstrdup(event, GFP_KERNEL);
-	if (!tu->call.name)
+	tu->tp.call.class = &tu->tp.class;
+	tu->tp.call.name = kstrdup(event, GFP_KERNEL);
+	if (!tu->tp.call.name)
 		goto error;
 
-	tu->class.system = kstrdup(group, GFP_KERNEL);
-	if (!tu->class.system)
+	tu->tp.class.system = kstrdup(group, GFP_KERNEL);
+	if (!tu->tp.class.system)
 		goto error;
 
 	INIT_LIST_HEAD(&tu->list);
@@ -128,11 +123,11 @@ alloc_trace_uprobe(const char *group, const char *event, int nargs, bool is_ret)
 	if (is_ret)
 		tu->consumer.ret_handler = uretprobe_dispatcher;
 	init_trace_uprobe_filter(&tu->filter);
-	tu->call.flags |= TRACE_EVENT_FL_USE_CALL_FILTER;
+	tu->tp.call.flags |= TRACE_EVENT_FL_USE_CALL_FILTER;
 	return tu;
 
 error:
-	kfree(tu->call.name);
+	kfree(tu->tp.call.name);
 	kfree(tu);
 
 	return ERR_PTR(-ENOMEM);
@@ -142,12 +137,12 @@ static void free_trace_uprobe(struct trace_uprobe *tu)
 {
 	int i;
 
-	for (i = 0; i < tu->nr_args; i++)
-		traceprobe_free_probe_arg(&tu->args[i]);
+	for (i = 0; i < tu->tp.nr_args; i++)
+		traceprobe_free_probe_arg(&tu->tp.args[i]);
 
 	iput(tu->inode);
-	kfree(tu->call.class->system);
-	kfree(tu->call.name);
+	kfree(tu->tp.call.class->system);
+	kfree(tu->tp.call.name);
 	kfree(tu->filename);
 	kfree(tu);
 }
@@ -157,8 +152,8 @@ static struct trace_uprobe *find_probe_event(const char *event, const char *grou
 	struct trace_uprobe *tu;
 
 	list_for_each_entry(tu, &uprobe_list, list)
-		if (strcmp(tu->call.name, event) == 0 &&
-		    strcmp(tu->call.class->system, group) == 0)
+		if (strcmp(tu->tp.call.name, event) == 0 &&
+		    strcmp(tu->tp.call.class->system, group) == 0)
 			return tu;
 
 	return NULL;
@@ -181,16 +176,16 @@ static int unregister_trace_uprobe(struct trace_uprobe *tu)
 /* Register a trace_uprobe and probe_event */
 static int register_trace_uprobe(struct trace_uprobe *tu)
 {
-	struct trace_uprobe *old_tp;
+	struct trace_uprobe *old_tu;
 	int ret;
 
 	mutex_lock(&uprobe_lock);
 
 	/* register as an event */
-	old_tp = find_probe_event(tu->call.name, tu->call.class->system);
-	if (old_tp) {
+	old_tu = find_probe_event(tu->tp.call.name, tu->tp.call.class->system);
+	if (old_tu) {
 		/* delete old event */
-		ret = unregister_trace_uprobe(old_tp);
+		ret = unregister_trace_uprobe(old_tu);
 		if (ret)
 			goto end;
 	}
@@ -360,34 +355,36 @@ static int create_trace_uprobe(int argc, char **argv)
 	/* parse arguments */
 	ret = 0;
 	for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
+		struct probe_arg *parg = &tu->tp.args[i];
+
 		/* Increment count for freeing args in error case */
-		tu->nr_args++;
+		tu->tp.nr_args++;
 
 		/* Parse argument name */
 		arg = strchr(argv[i], '=');
 		if (arg) {
 			*arg++ = '\0';
-			tu->args[i].name = kstrdup(argv[i], GFP_KERNEL);
+			parg->name = kstrdup(argv[i], GFP_KERNEL);
 		} else {
 			arg = argv[i];
 			/* If argument name is omitted, set "argN" */
 			snprintf(buf, MAX_EVENT_NAME_LEN, "arg%d", i + 1);
-			tu->args[i].name = kstrdup(buf, GFP_KERNEL);
+			parg->name = kstrdup(buf, GFP_KERNEL);
 		}
 
-		if (!tu->args[i].name) {
+		if (!parg->name) {
 			pr_info("Failed to allocate argument[%d] name.\n", i);
 			ret = -ENOMEM;
 			goto error;
 		}
 
-		if (!is_good_name(tu->args[i].name)) {
-			pr_info("Invalid argument[%d] name: %s\n", i, tu->args[i].name);
+		if (!is_good_name(parg->name)) {
+			pr_info("Invalid argument[%d] name: %s\n", i, parg->name);
 			ret = -EINVAL;
 			goto error;
 		}
 
-		if (traceprobe_conflict_field_name(tu->args[i].name, tu->args, i)) {
+		if (traceprobe_conflict_field_name(parg->name, tu->tp.args, i)) {
 			pr_info("Argument[%d] name '%s' conflicts with "
 				"another field.\n", i, argv[i]);
 			ret = -EINVAL;
@@ -395,7 +392,8 @@ static int create_trace_uprobe(int argc, char **argv)
 		}
 
 		/* Parse fetch argument */
-		ret = traceprobe_parse_probe_arg(arg, &tu->size, &tu->args[i], false, false);
+		ret = traceprobe_parse_probe_arg(arg, &tu->tp.size, parg,
+						 false, false);
 		if (ret) {
 			pr_info("Parse error at argument[%d]. (%d)\n", i, ret);
 			goto error;
@@ -459,11 +457,11 @@ static int probes_seq_show(struct seq_file *m, void *v)
 	char c = is_ret_probe(tu) ? 'r' : 'p';
 	int i;
 
-	seq_printf(m, "%c:%s/%s", c, tu->call.class->system, tu->call.name);
+	seq_printf(m, "%c:%s/%s", c, tu->tp.call.class->system, tu->tp.call.name);
 	seq_printf(m, " %s:0x%p", tu->filename, (void *)tu->offset);
 
-	for (i = 0; i < tu->nr_args; i++)
-		seq_printf(m, " %s=%s", tu->args[i].name, tu->args[i].comm);
+	for (i = 0; i < tu->tp.nr_args; i++)
+		seq_printf(m, " %s=%s", tu->tp.args[i].name, tu->tp.args[i].comm);
 
 	seq_printf(m, "\n");
 	return 0;
@@ -509,7 +507,7 @@ static int probes_profile_seq_show(struct seq_file *m, void *v)
 {
 	struct trace_uprobe *tu = v;
 
-	seq_printf(m, "  %s %-44s %15lu\n", tu->filename, tu->call.name, tu->nhit);
+	seq_printf(m, "  %s %-44s %15lu\n", tu->filename, tu->tp.call.name, tu->nhit);
 	return 0;
 }
 
@@ -541,11 +539,11 @@ static void uprobe_trace_print(struct trace_uprobe *tu,
 	struct ring_buffer *buffer;
 	void *data;
 	int size, i;
-	struct ftrace_event_call *call = &tu->call;
+	struct ftrace_event_call *call = &tu->tp.call;
 
 	size = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
 	event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
-						  size + tu->size, 0, 0);
+						  size + tu->tp.size, 0, 0);
 	if (!event)
 		return;
 
@@ -559,8 +557,10 @@ static void uprobe_trace_print(struct trace_uprobe *tu,
 		data = DATAOF_TRACE_ENTRY(entry, false);
 	}
 
-	for (i = 0; i < tu->nr_args; i++)
-		call_fetch(&tu->args[i].fetch, regs, data + tu->args[i].offset);
+	for (i = 0; i < tu->tp.nr_args; i++) {
+		call_fetch(&tu->tp.args[i].fetch, regs,
+			   data + tu->tp.args[i].offset);
+	}
 
 	if (!call_filter_check_discard(call, entry, buffer, event))
 		trace_buffer_unlock_commit(buffer, event, 0, 0);
@@ -591,23 +591,24 @@ print_uprobe_event(struct trace_iterator *iter, int flags, struct trace_event *e
 	int i;
 
 	entry = (struct uprobe_trace_entry_head *)iter->ent;
-	tu = container_of(event, struct trace_uprobe, call.event);
+	tu = container_of(event, struct trace_uprobe, tp.call.event);
 
 	if (is_ret_probe(tu)) {
-		if (!trace_seq_printf(s, "%s: (0x%lx <- 0x%lx)", tu->call.name,
+		if (!trace_seq_printf(s, "%s: (0x%lx <- 0x%lx)", tu->tp.call.name,
 					entry->vaddr[1], entry->vaddr[0]))
 			goto partial;
 		data = DATAOF_TRACE_ENTRY(entry, true);
 	} else {
-		if (!trace_seq_printf(s, "%s: (0x%lx)", tu->call.name,
+		if (!trace_seq_printf(s, "%s: (0x%lx)", tu->tp.call.name,
 					entry->vaddr[0]))
 			goto partial;
 		data = DATAOF_TRACE_ENTRY(entry, false);
 	}
 
-	for (i = 0; i < tu->nr_args; i++) {
-		if (!tu->args[i].type->print(s, tu->args[i].name,
-					     data + tu->args[i].offset, entry))
+	for (i = 0; i < tu->tp.nr_args; i++) {
+		struct probe_arg *parg = &tu->tp.args[i];
+
+		if (!parg->type->print(s, parg->name, data + parg->offset, entry))
 			goto partial;
 	}
 
@@ -618,11 +619,6 @@ partial:
 	return TRACE_TYPE_PARTIAL_LINE;
 }
 
-static inline bool is_trace_uprobe_enabled(struct trace_uprobe *tu)
-{
-	return tu->flags & (TP_FLAG_TRACE | TP_FLAG_PROFILE);
-}
-
 typedef bool (*filter_func_t)(struct uprobe_consumer *self,
 				enum uprobe_filter_ctx ctx,
 				struct mm_struct *mm);
@@ -632,29 +628,29 @@ probe_event_enable(struct trace_uprobe *tu, int flag, filter_func_t filter)
 {
 	int ret = 0;
 
-	if (is_trace_uprobe_enabled(tu))
+	if (trace_probe_is_enabled(&tu->tp))
 		return -EINTR;
 
 	WARN_ON(!uprobe_filter_is_empty(&tu->filter));
 
-	tu->flags |= flag;
+	tu->tp.flags |= flag;
 	tu->consumer.filter = filter;
 	ret = uprobe_register(tu->inode, tu->offset, &tu->consumer);
 	if (ret)
-		tu->flags &= ~flag;
+		tu->tp.flags &= ~flag;
 
 	return ret;
 }
 
 static void probe_event_disable(struct trace_uprobe *tu, int flag)
 {
-	if (!is_trace_uprobe_enabled(tu))
+	if (!trace_probe_is_enabled(&tu->tp))
 		return;
 
 	WARN_ON(!uprobe_filter_is_empty(&tu->filter));
 
 	uprobe_unregister(tu->inode, tu->offset, &tu->consumer);
-	tu->flags &= ~flag;
+	tu->tp.flags &= ~flag;
 }
 
 static int uprobe_event_define_fields(struct ftrace_event_call *event_call)
@@ -672,12 +668,12 @@ static int uprobe_event_define_fields(struct ftrace_event_call *event_call)
 		size = SIZEOF_TRACE_ENTRY(false);
 	}
 	/* Set argument names as fields */
-	for (i = 0; i < tu->nr_args; i++) {
-		ret = trace_define_field(event_call, tu->args[i].type->fmttype,
-					 tu->args[i].name,
-					 size + tu->args[i].offset,
-					 tu->args[i].type->size,
-					 tu->args[i].type->is_signed,
+	for (i = 0; i < tu->tp.nr_args; i++) {
+		struct probe_arg *parg = &tu->tp.args[i];
+
+		ret = trace_define_field(event_call, parg->type->fmttype,
+					 parg->name, size + parg->offset,
+					 parg->type->size, parg->type->is_signed,
 					 FILTER_OTHER);
 
 		if (ret)
@@ -705,16 +701,16 @@ static int __set_print_fmt(struct trace_uprobe *tu, char *buf, int len)
 
 	pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt);
 
-	for (i = 0; i < tu->nr_args; i++) {
+	for (i = 0; i < tu->tp.nr_args; i++) {
 		pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=%s",
-				tu->args[i].name, tu->args[i].type->fmt);
+				tu->tp.args[i].name, tu->tp.args[i].type->fmt);
 	}
 
 	pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg);
 
-	for (i = 0; i < tu->nr_args; i++) {
+	for (i = 0; i < tu->tp.nr_args; i++) {
 		pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
-				tu->args[i].name);
+				tu->tp.args[i].name);
 	}
 
 	return pos;	/* return the length of print_fmt */
@@ -734,7 +730,7 @@ static int set_print_fmt(struct trace_uprobe *tu)
 
 	/* Second: actually write the @print_fmt */
 	__set_print_fmt(tu, print_fmt, len + 1);
-	tu->call.print_fmt = print_fmt;
+	tu->tp.call.print_fmt = print_fmt;
 
 	return 0;
 }
@@ -831,14 +827,14 @@ static bool uprobe_perf_filter(struct uprobe_consumer *uc,
 static void uprobe_perf_print(struct trace_uprobe *tu,
 				unsigned long func, struct pt_regs *regs)
 {
-	struct ftrace_event_call *call = &tu->call;
+	struct ftrace_event_call *call = &tu->tp.call;
 	struct uprobe_trace_entry_head *entry;
 	struct hlist_head *head;
 	void *data;
 	int size, rctx, i;
 
 	size = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
-	size = ALIGN(size + tu->size + sizeof(u32), sizeof(u64)) - sizeof(u32);
+	size = ALIGN(size + tu->tp.size + sizeof(u32), sizeof(u64)) - sizeof(u32);
 
 	preempt_disable();
 	head = this_cpu_ptr(call->perf_events);
@@ -858,8 +854,11 @@ static void uprobe_perf_print(struct trace_uprobe *tu,
 		data = DATAOF_TRACE_ENTRY(entry, false);
 	}
 
-	for (i = 0; i < tu->nr_args; i++)
-		call_fetch(&tu->args[i].fetch, regs, data + tu->args[i].offset);
+	for (i = 0; i < tu->tp.nr_args; i++) {
+		struct probe_arg *parg = &tu->tp.args[i];
+
+		call_fetch(&parg->fetch, regs, data + parg->offset);
+	}
 
 	perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL);
  out:
@@ -926,11 +925,11 @@ static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs)
 	tu = container_of(con, struct trace_uprobe, consumer);
 	tu->nhit++;
 
-	if (tu->flags & TP_FLAG_TRACE)
+	if (tu->tp.flags & TP_FLAG_TRACE)
 		ret |= uprobe_trace_func(tu, regs);
 
 #ifdef CONFIG_PERF_EVENTS
-	if (tu->flags & TP_FLAG_PROFILE)
+	if (tu->tp.flags & TP_FLAG_PROFILE)
 		ret |= uprobe_perf_func(tu, regs);
 #endif
 	return ret;
@@ -943,11 +942,11 @@ static int uretprobe_dispatcher(struct uprobe_consumer *con,
 
 	tu = container_of(con, struct trace_uprobe, consumer);
 
-	if (tu->flags & TP_FLAG_TRACE)
+	if (tu->tp.flags & TP_FLAG_TRACE)
 		uretprobe_trace_func(tu, func, regs);
 
 #ifdef CONFIG_PERF_EVENTS
-	if (tu->flags & TP_FLAG_PROFILE)
+	if (tu->tp.flags & TP_FLAG_PROFILE)
 		uretprobe_perf_func(tu, func, regs);
 #endif
 	return 0;
@@ -959,7 +958,7 @@ static struct trace_event_functions uprobe_funcs = {
 
 static int register_uprobe_event(struct trace_uprobe *tu)
 {
-	struct ftrace_event_call *call = &tu->call;
+	struct ftrace_event_call *call = &tu->tp.call;
 	int ret;
 
 	/* Initialize ftrace_event_call */
@@ -994,11 +993,11 @@ static int unregister_uprobe_event(struct trace_uprobe *tu)
 	int ret;
 
 	/* tu->event is unregistered in trace_remove_event_call() */
-	ret = trace_remove_event_call(&tu->call);
+	ret = trace_remove_event_call(&tu->tp.call);
 	if (ret)
 		return ret;
-	kfree(tu->call.print_fmt);
-	tu->call.print_fmt = NULL;
+	kfree(tu->tp.call.print_fmt);
+	tu->tp.call.print_fmt = NULL;
 	return 0;
 }
 
-- 
1.8.4.3

[for-next][PATCH 05/17] tracing/kprobes: Move common functions to trace_probe.h

[Steven Rostedt]

[-- Attachment #1: 0005-tracing-kprobes-Move-common-functions-to-trace_probe.patch --]
[-- Type: text/plain, Size: 4178 bytes --]

From: Namhyung Kim <namhyung.kim@lge.com>

The __get_data_size() and store_trace_args() will be used by uprobes
too.  Move them to a common location.

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 kernel/trace/trace_kprobe.c | 48 ---------------------------------------------
 kernel/trace/trace_probe.h  | 48 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 48 insertions(+), 48 deletions(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 7271906..fb1a027 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -740,54 +740,6 @@ static const struct file_operations kprobe_profile_ops = {
 	.release        = seq_release,
 };
 
-/* Sum up total data length for dynamic arraies (strings) */
-static __kprobes int __get_data_size(struct trace_probe *tp,
-				     struct pt_regs *regs)
-{
-	int i, ret = 0;
-	u32 len;
-
-	for (i = 0; i < tp->nr_args; i++)
-		if (unlikely(tp->args[i].fetch_size.fn)) {
-			call_fetch(&tp->args[i].fetch_size, regs, &len);
-			ret += len;
-		}
-
-	return ret;
-}
-
-/* Store the value of each argument */
-static __kprobes void store_trace_args(int ent_size, struct trace_probe *tp,
-				       struct pt_regs *regs,
-				       u8 *data, int maxlen)
-{
-	int i;
-	u32 end = tp->size;
-	u32 *dl;	/* Data (relative) location */
-
-	for (i = 0; i < tp->nr_args; i++) {
-		if (unlikely(tp->args[i].fetch_size.fn)) {
-			/*
-			 * First, we set the relative location and
-			 * maximum data length to *dl
-			 */
-			dl = (u32 *)(data + tp->args[i].offset);
-			*dl = make_data_rloc(maxlen, end - tp->args[i].offset);
-			/* Then try to fetch string or dynamic array data */
-			call_fetch(&tp->args[i].fetch, regs, dl);
-			/* Reduce maximum length */
-			end += get_rloc_len(*dl);
-			maxlen -= get_rloc_len(*dl);
-			/* Trick here, convert data_rloc to data_loc */
-			*dl = convert_rloc_to_loc(*dl,
-				 ent_size + tp->args[i].offset);
-		} else
-			/* Just fetching data normally */
-			call_fetch(&tp->args[i].fetch, regs,
-				   data + tp->args[i].offset);
-	}
-}
-
 /* Kprobe handler */
 static __kprobes void
 __kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs,
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index 984e91e..d384fbd 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -178,3 +178,51 @@ extern ssize_t traceprobe_probes_write(struct file *file,
 		int (*createfn)(int, char**));
 
 extern int traceprobe_command(const char *buf, int (*createfn)(int, char**));
+
+/* Sum up total data length for dynamic arraies (strings) */
+static inline __kprobes int
+__get_data_size(struct trace_probe *tp, struct pt_regs *regs)
+{
+	int i, ret = 0;
+	u32 len;
+
+	for (i = 0; i < tp->nr_args; i++)
+		if (unlikely(tp->args[i].fetch_size.fn)) {
+			call_fetch(&tp->args[i].fetch_size, regs, &len);
+			ret += len;
+		}
+
+	return ret;
+}
+
+/* Store the value of each argument */
+static inline __kprobes void
+store_trace_args(int ent_size, struct trace_probe *tp, struct pt_regs *regs,
+		 u8 *data, int maxlen)
+{
+	int i;
+	u32 end = tp->size;
+	u32 *dl;	/* Data (relative) location */
+
+	for (i = 0; i < tp->nr_args; i++) {
+		if (unlikely(tp->args[i].fetch_size.fn)) {
+			/*
+			 * First, we set the relative location and
+			 * maximum data length to *dl
+			 */
+			dl = (u32 *)(data + tp->args[i].offset);
+			*dl = make_data_rloc(maxlen, end - tp->args[i].offset);
+			/* Then try to fetch string or dynamic array data */
+			call_fetch(&tp->args[i].fetch, regs, dl);
+			/* Reduce maximum length */
+			end += get_rloc_len(*dl);
+			maxlen -= get_rloc_len(*dl);
+			/* Trick here, convert data_rloc to data_loc */
+			*dl = convert_rloc_to_loc(*dl,
+				 ent_size + tp->args[i].offset);
+		} else
+			/* Just fetching data normally */
+			call_fetch(&tp->args[i].fetch, regs,
+				   data + tp->args[i].offset);
+	}
+}
-- 
1.8.4.3

[for-next][PATCH 06/17] tracing/probes: Integrate duplicate set_print_fmt()

[Steven Rostedt]

[-- Attachment #1: 0006-tracing-probes-Integrate-duplicate-set_print_fmt.patch --]
[-- Type: text/plain, Size: 7130 bytes --]

From: Namhyung Kim <namhyung.kim@lge.com>

The set_print_fmt() functions are implemented almost same for
[ku]probes.  Move it to a common place and get rid of the duplication.

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 kernel/trace/trace_kprobe.c | 63 +--------------------------------------------
 kernel/trace/trace_probe.c  | 62 ++++++++++++++++++++++++++++++++++++++++++++
 kernel/trace/trace_probe.h  |  2 ++
 kernel/trace/trace_uprobe.c | 55 +--------------------------------------
 4 files changed, 66 insertions(+), 116 deletions(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index fb1a027..c9ffdaf 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -964,67 +964,6 @@ static int kretprobe_event_define_fields(struct ftrace_event_call *event_call)
 	return 0;
 }
 
-static int __set_print_fmt(struct trace_kprobe *tk, char *buf, int len)
-{
-	int i;
-	int pos = 0;
-
-	const char *fmt, *arg;
-
-	if (!trace_kprobe_is_return(tk)) {
-		fmt = "(%lx)";
-		arg = "REC->" FIELD_STRING_IP;
-	} else {
-		fmt = "(%lx <- %lx)";
-		arg = "REC->" FIELD_STRING_FUNC ", REC->" FIELD_STRING_RETIP;
-	}
-
-	/* When len=0, we just calculate the needed length */
-#define LEN_OR_ZERO (len ? len - pos : 0)
-
-	pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt);
-
-	for (i = 0; i < tk->tp.nr_args; i++) {
-		pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=%s",
-				tk->tp.args[i].name, tk->tp.args[i].type->fmt);
-	}
-
-	pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg);
-
-	for (i = 0; i < tk->tp.nr_args; i++) {
-		if (strcmp(tk->tp.args[i].type->name, "string") == 0)
-			pos += snprintf(buf + pos, LEN_OR_ZERO,
-					", __get_str(%s)",
-					tk->tp.args[i].name);
-		else
-			pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
-					tk->tp.args[i].name);
-	}
-
-#undef LEN_OR_ZERO
-
-	/* return the length of print_fmt */
-	return pos;
-}
-
-static int set_print_fmt(struct trace_kprobe *tk)
-{
-	int len;
-	char *print_fmt;
-
-	/* First: called with 0 length to calculate the needed length */
-	len = __set_print_fmt(tk, NULL, 0);
-	print_fmt = kmalloc(len + 1, GFP_KERNEL);
-	if (!print_fmt)
-		return -ENOMEM;
-
-	/* Second: actually write the @print_fmt */
-	__set_print_fmt(tk, print_fmt, len + 1);
-	tk->tp.call.print_fmt = print_fmt;
-
-	return 0;
-}
-
 #ifdef CONFIG_PERF_EVENTS
 
 /* Kprobe profile handler */
@@ -1175,7 +1114,7 @@ static int register_kprobe_event(struct trace_kprobe *tk)
 		call->event.funcs = &kprobe_funcs;
 		call->class->define_fields = kprobe_event_define_fields;
 	}
-	if (set_print_fmt(tk) < 0)
+	if (set_print_fmt(&tk->tp, trace_kprobe_is_return(tk)) < 0)
 		return -ENOMEM;
 	ret = register_ftrace_event(&call->event);
 	if (!ret) {
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 430505b..d8347b0 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -837,3 +837,65 @@ out:
 
 	return ret;
 }
+
+static int __set_print_fmt(struct trace_probe *tp, char *buf, int len,
+			   bool is_return)
+{
+	int i;
+	int pos = 0;
+
+	const char *fmt, *arg;
+
+	if (!is_return) {
+		fmt = "(%lx)";
+		arg = "REC->" FIELD_STRING_IP;
+	} else {
+		fmt = "(%lx <- %lx)";
+		arg = "REC->" FIELD_STRING_FUNC ", REC->" FIELD_STRING_RETIP;
+	}
+
+	/* When len=0, we just calculate the needed length */
+#define LEN_OR_ZERO (len ? len - pos : 0)
+
+	pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt);
+
+	for (i = 0; i < tp->nr_args; i++) {
+		pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=%s",
+				tp->args[i].name, tp->args[i].type->fmt);
+	}
+
+	pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg);
+
+	for (i = 0; i < tp->nr_args; i++) {
+		if (strcmp(tp->args[i].type->name, "string") == 0)
+			pos += snprintf(buf + pos, LEN_OR_ZERO,
+					", __get_str(%s)",
+					tp->args[i].name);
+		else
+			pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
+					tp->args[i].name);
+	}
+
+#undef LEN_OR_ZERO
+
+	/* return the length of print_fmt */
+	return pos;
+}
+
+int set_print_fmt(struct trace_probe *tp, bool is_return)
+{
+	int len;
+	char *print_fmt;
+
+	/* First: called with 0 length to calculate the needed length */
+	len = __set_print_fmt(tp, NULL, 0, is_return);
+	print_fmt = kmalloc(len + 1, GFP_KERNEL);
+	if (!print_fmt)
+		return -ENOMEM;
+
+	/* Second: actually write the @print_fmt */
+	__set_print_fmt(tp, print_fmt, len + 1, is_return);
+	tp->call.print_fmt = print_fmt;
+
+	return 0;
+}
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index d384fbd..2c979cb 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -226,3 +226,5 @@ store_trace_args(int ent_size, struct trace_probe *tp, struct pt_regs *regs,
 				   data + tp->args[i].offset);
 	}
 }
+
+extern int set_print_fmt(struct trace_probe *tp, bool is_return);
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index afda372..b233d9c 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -682,59 +682,6 @@ static int uprobe_event_define_fields(struct ftrace_event_call *event_call)
 	return 0;
 }
 
-#define LEN_OR_ZERO		(len ? len - pos : 0)
-static int __set_print_fmt(struct trace_uprobe *tu, char *buf, int len)
-{
-	const char *fmt, *arg;
-	int i;
-	int pos = 0;
-
-	if (is_ret_probe(tu)) {
-		fmt = "(%lx <- %lx)";
-		arg = "REC->" FIELD_STRING_FUNC ", REC->" FIELD_STRING_RETIP;
-	} else {
-		fmt = "(%lx)";
-		arg = "REC->" FIELD_STRING_IP;
-	}
-
-	/* When len=0, we just calculate the needed length */
-
-	pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt);
-
-	for (i = 0; i < tu->tp.nr_args; i++) {
-		pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=%s",
-				tu->tp.args[i].name, tu->tp.args[i].type->fmt);
-	}
-
-	pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg);
-
-	for (i = 0; i < tu->tp.nr_args; i++) {
-		pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
-				tu->tp.args[i].name);
-	}
-
-	return pos;	/* return the length of print_fmt */
-}
-#undef LEN_OR_ZERO
-
-static int set_print_fmt(struct trace_uprobe *tu)
-{
-	char *print_fmt;
-	int len;
-
-	/* First: called with 0 length to calculate the needed length */
-	len = __set_print_fmt(tu, NULL, 0);
-	print_fmt = kmalloc(len + 1, GFP_KERNEL);
-	if (!print_fmt)
-		return -ENOMEM;
-
-	/* Second: actually write the @print_fmt */
-	__set_print_fmt(tu, print_fmt, len + 1);
-	tu->tp.call.print_fmt = print_fmt;
-
-	return 0;
-}
-
 #ifdef CONFIG_PERF_EVENTS
 static bool
 __uprobe_perf_filter(struct trace_uprobe_filter *filter, struct mm_struct *mm)
@@ -966,7 +913,7 @@ static int register_uprobe_event(struct trace_uprobe *tu)
 	call->event.funcs = &uprobe_funcs;
 	call->class->define_fields = uprobe_event_define_fields;
 
-	if (set_print_fmt(tu) < 0)
+	if (set_print_fmt(&tu->tp, is_ret_probe(tu)) < 0)
 		return -ENOMEM;
 
 	ret = register_ftrace_event(&call->event);
-- 
1.8.4.3

[for-next][PATCH 07/17] tracing/probes: Move fetch function helpers to trace_probe.h

[Steven Rostedt]

[-- Attachment #1: 0007-tracing-probes-Move-fetch-function-helpers-to-trace_.patch --]
[-- Type: text/plain, Size: 9986 bytes --]

From: Namhyung Kim <namhyung.kim@lge.com>

Move fetch function helper macros/functions to the header file and
make them external.  This is preparation of supporting uprobe fetch
table in next patch.

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 kernel/trace/trace_probe.c | 74 ++++++++--------------------------------------
 kernel/trace/trace_probe.h | 65 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 78 insertions(+), 61 deletions(-)

diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index d8347b0..c26bc9e 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -35,19 +35,15 @@ const char *reserved_field_names[] = {
 	FIELD_STRING_FUNC,
 };
 
-/* Printing function type */
-#define PRINT_TYPE_FUNC_NAME(type)	print_type_##type
-#define PRINT_TYPE_FMT_NAME(type)	print_type_format_##type
-
 /* Printing  in basic type function template */
 #define DEFINE_BASIC_PRINT_TYPE_FUNC(type, fmt)				\
-static __kprobes int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s,	\
+__kprobes int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s,	\
 						const char *name,	\
 						void *data, void *ent)	\
 {									\
 	return trace_seq_printf(s, " %s=" fmt, name, *(type *)data);	\
 }									\
-static const char PRINT_TYPE_FMT_NAME(type)[] = fmt;
+const char PRINT_TYPE_FMT_NAME(type)[] = fmt;
 
 DEFINE_BASIC_PRINT_TYPE_FUNC(u8 , "0x%x")
 DEFINE_BASIC_PRINT_TYPE_FUNC(u16, "0x%x")
@@ -58,23 +54,12 @@ DEFINE_BASIC_PRINT_TYPE_FUNC(s16, "%d")
 DEFINE_BASIC_PRINT_TYPE_FUNC(s32, "%d")
 DEFINE_BASIC_PRINT_TYPE_FUNC(s64, "%Ld")
 
-static inline void *get_rloc_data(u32 *dl)
-{
-	return (u8 *)dl + get_rloc_offs(*dl);
-}
-
-/* For data_loc conversion */
-static inline void *get_loc_data(u32 *dl, void *ent)
-{
-	return (u8 *)ent + get_rloc_offs(*dl);
-}
-
 /* For defining macros, define string/string_size types */
 typedef u32 string;
 typedef u32 string_size;
 
 /* Print type function for string type */
-static __kprobes int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s,
+__kprobes int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s,
 						  const char *name,
 						  void *data, void *ent)
 {
@@ -87,7 +72,7 @@ static __kprobes int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s,
 					(const char *)get_loc_data(data, ent));
 }
 
-static const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\"";
+const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\"";
 
 #define FETCH_FUNC_NAME(method, type)	fetch_##method##_##type
 /*
@@ -111,7 +96,7 @@ DEFINE_FETCH_##method(u64)
 
 /* Data fetch function templates */
 #define DEFINE_FETCH_reg(type)						\
-static __kprobes void FETCH_FUNC_NAME(reg, type)(struct pt_regs *regs,	\
+__kprobes void FETCH_FUNC_NAME(reg, type)(struct pt_regs *regs,		\
 					void *offset, void *dest)	\
 {									\
 	*(type *)dest = (type)regs_get_register(regs,			\
@@ -123,7 +108,7 @@ DEFINE_BASIC_FETCH_FUNCS(reg)
 #define fetch_reg_string_size	NULL
 
 #define DEFINE_FETCH_stack(type)					\
-static __kprobes void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,\
+__kprobes void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,	\
 					  void *offset, void *dest)	\
 {									\
 	*(type *)dest = (type)regs_get_kernel_stack_nth(regs,		\
@@ -135,7 +120,7 @@ DEFINE_BASIC_FETCH_FUNCS(stack)
 #define fetch_stack_string_size	NULL
 
 #define DEFINE_FETCH_retval(type)					\
-static __kprobes void FETCH_FUNC_NAME(retval, type)(struct pt_regs *regs,\
+__kprobes void FETCH_FUNC_NAME(retval, type)(struct pt_regs *regs,	\
 					  void *dummy, void *dest)	\
 {									\
 	*(type *)dest = (type)regs_return_value(regs);			\
@@ -146,7 +131,7 @@ DEFINE_BASIC_FETCH_FUNCS(retval)
 #define fetch_retval_string_size	NULL
 
 #define DEFINE_FETCH_memory(type)					\
-static __kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,\
+__kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,	\
 					  void *addr, void *dest)	\
 {									\
 	type retval;							\
@@ -160,7 +145,7 @@ DEFINE_BASIC_FETCH_FUNCS(memory)
  * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max
  * length and relative data location.
  */
-static __kprobes void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
+__kprobes void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
 						      void *addr, void *dest)
 {
 	long ret;
@@ -197,7 +182,7 @@ static __kprobes void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
 }
 
 /* Return the length of string -- including null terminal byte */
-static __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
+__kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
 							void *addr, void *dest)
 {
 	mm_segment_t old_fs;
@@ -268,7 +253,7 @@ static struct symbol_cache *alloc_symbol_cache(const char *sym, long offset)
 }
 
 #define DEFINE_FETCH_symbol(type)					\
-static __kprobes void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs,\
+__kprobes void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs,	\
 					  void *data, void *dest)	\
 {									\
 	struct symbol_cache *sc = data;					\
@@ -288,7 +273,7 @@ struct deref_fetch_param {
 };
 
 #define DEFINE_FETCH_deref(type)					\
-static __kprobes void FETCH_FUNC_NAME(deref, type)(struct pt_regs *regs,\
+__kprobes void FETCH_FUNC_NAME(deref, type)(struct pt_regs *regs,	\
 					    void *data, void *dest)	\
 {									\
 	struct deref_fetch_param *dprm = data;				\
@@ -329,7 +314,7 @@ struct bitfield_fetch_param {
 };
 
 #define DEFINE_FETCH_bitfield(type)					\
-static __kprobes void FETCH_FUNC_NAME(bitfield, type)(struct pt_regs *regs,\
+__kprobes void FETCH_FUNC_NAME(bitfield, type)(struct pt_regs *regs,	\
 					    void *data, void *dest)	\
 {									\
 	struct bitfield_fetch_param *bprm = data;			\
@@ -374,39 +359,6 @@ free_bitfield_fetch_param(struct bitfield_fetch_param *data)
 	kfree(data);
 }
 
-/* Default (unsigned long) fetch type */
-#define __DEFAULT_FETCH_TYPE(t) u##t
-#define _DEFAULT_FETCH_TYPE(t) __DEFAULT_FETCH_TYPE(t)
-#define DEFAULT_FETCH_TYPE _DEFAULT_FETCH_TYPE(BITS_PER_LONG)
-#define DEFAULT_FETCH_TYPE_STR __stringify(DEFAULT_FETCH_TYPE)
-
-#define ASSIGN_FETCH_FUNC(method, type)	\
-	[FETCH_MTD_##method] = FETCH_FUNC_NAME(method, type)
-
-#define __ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, _fmttype)	\
-	{.name = _name,				\
-	 .size = _size,					\
-	 .is_signed = sign,				\
-	 .print = PRINT_TYPE_FUNC_NAME(ptype),		\
-	 .fmt = PRINT_TYPE_FMT_NAME(ptype),		\
-	 .fmttype = _fmttype,				\
-	 .fetch = {					\
-ASSIGN_FETCH_FUNC(reg, ftype),				\
-ASSIGN_FETCH_FUNC(stack, ftype),			\
-ASSIGN_FETCH_FUNC(retval, ftype),			\
-ASSIGN_FETCH_FUNC(memory, ftype),			\
-ASSIGN_FETCH_FUNC(symbol, ftype),			\
-ASSIGN_FETCH_FUNC(deref, ftype),			\
-ASSIGN_FETCH_FUNC(bitfield, ftype),			\
-	  }						\
-	}
-
-#define ASSIGN_FETCH_TYPE(ptype, ftype, sign)			\
-	__ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, #ptype)
-
-#define FETCH_TYPE_STRING	0
-#define FETCH_TYPE_STRSIZE	1
-
 /* Fetch type information table */
 static const struct fetch_type fetch_type_table[] = {
 	/* Special types */
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index 2c979cb..bd621c0 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -81,6 +81,17 @@
  */
 #define convert_rloc_to_loc(dl, offs)	((u32)(dl) + (offs))
 
+static inline void *get_rloc_data(u32 *dl)
+{
+	return (u8 *)dl + get_rloc_offs(*dl);
+}
+
+/* For data_loc conversion */
+static inline void *get_loc_data(u32 *dl, void *ent)
+{
+	return (u8 *)ent + get_rloc_offs(*dl);
+}
+
 /* Data fetch function type */
 typedef	void (*fetch_func_t)(struct pt_regs *, void *, void *);
 /* Printing function type */
@@ -115,6 +126,60 @@ struct fetch_param {
 	void 			*data;
 };
 
+#define PRINT_TYPE_FUNC_NAME(type)	print_type_##type
+#define PRINT_TYPE_FMT_NAME(type)	print_type_format_##type
+
+/* Printing  in basic type function template */
+#define DECLARE_BASIC_PRINT_TYPE_FUNC(type)				\
+__kprobes int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s,		\
+					 const char *name,		\
+					 void *data, void *ent);	\
+extern const char PRINT_TYPE_FMT_NAME(type)[]
+
+DECLARE_BASIC_PRINT_TYPE_FUNC(u8);
+DECLARE_BASIC_PRINT_TYPE_FUNC(u16);
+DECLARE_BASIC_PRINT_TYPE_FUNC(u32);
+DECLARE_BASIC_PRINT_TYPE_FUNC(u64);
+DECLARE_BASIC_PRINT_TYPE_FUNC(s8);
+DECLARE_BASIC_PRINT_TYPE_FUNC(s16);
+DECLARE_BASIC_PRINT_TYPE_FUNC(s32);
+DECLARE_BASIC_PRINT_TYPE_FUNC(s64);
+DECLARE_BASIC_PRINT_TYPE_FUNC(string);
+
+/* Default (unsigned long) fetch type */
+#define __DEFAULT_FETCH_TYPE(t) u##t
+#define _DEFAULT_FETCH_TYPE(t) __DEFAULT_FETCH_TYPE(t)
+#define DEFAULT_FETCH_TYPE _DEFAULT_FETCH_TYPE(BITS_PER_LONG)
+#define DEFAULT_FETCH_TYPE_STR __stringify(DEFAULT_FETCH_TYPE)
+
+#define ASSIGN_FETCH_FUNC(method, type)	\
+	[FETCH_MTD_##method] = FETCH_FUNC_NAME(method, type)
+
+#define __ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, _fmttype)	\
+	{.name = _name,				\
+	 .size = _size,					\
+	 .is_signed = sign,				\
+	 .print = PRINT_TYPE_FUNC_NAME(ptype),		\
+	 .fmt = PRINT_TYPE_FMT_NAME(ptype),		\
+	 .fmttype = _fmttype,				\
+	 .fetch = {					\
+ASSIGN_FETCH_FUNC(reg, ftype),				\
+ASSIGN_FETCH_FUNC(stack, ftype),			\
+ASSIGN_FETCH_FUNC(retval, ftype),			\
+ASSIGN_FETCH_FUNC(memory, ftype),			\
+ASSIGN_FETCH_FUNC(symbol, ftype),			\
+ASSIGN_FETCH_FUNC(deref, ftype),			\
+ASSIGN_FETCH_FUNC(bitfield, ftype),			\
+	  }						\
+	}
+
+#define ASSIGN_FETCH_TYPE(ptype, ftype, sign)			\
+	__ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, #ptype)
+
+#define FETCH_TYPE_STRING	0
+#define FETCH_TYPE_STRSIZE	1
+
+
 struct probe_arg {
 	struct fetch_param	fetch;
 	struct fetch_param	fetch_size;
-- 
1.8.4.3

[for-next][PATCH 08/17] tracing/probes: Split [ku]probes_fetch_type_table

[Steven Rostedt]

[-- Attachment #1: 0008-tracing-probes-Split-ku-probes_fetch_type_table.patch --]
[-- Type: text/plain, Size: 10948 bytes --]

From: Namhyung Kim <namhyung.kim@lge.com>

Use separate fetch_type_table for kprobes and uprobes.  It currently
shares all fetch methods but some of them will be implemented
differently later.

This is not to break build if [ku]probes is configured alone (like
!CONFIG_KPROBE_EVENT and CONFIG_UPROBE_EVENT).  So I added '__weak'
to the table declaration so that it can be safely omitted when it
configured out.

Acked-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 kernel/trace/trace_kprobe.c | 20 ++++++++++++++
 kernel/trace/trace_probe.c  | 65 ++++++++++++++++++---------------------------
 kernel/trace/trace_probe.h  | 53 ++++++++++++++++++++++++++++++++++++
 kernel/trace/trace_uprobe.c | 20 ++++++++++++++
 4 files changed, 119 insertions(+), 39 deletions(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index c9ffdaf..fe3f00c 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -88,6 +88,26 @@ static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs);
 static int kretprobe_dispatcher(struct kretprobe_instance *ri,
 				struct pt_regs *regs);
 
+/* Fetch type information table */
+const struct fetch_type kprobes_fetch_type_table[] = {
+	/* Special types */
+	[FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string,
+					sizeof(u32), 1, "__data_loc char[]"),
+	[FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32,
+					string_size, sizeof(u32), 0, "u32"),
+	/* Basic types */
+	ASSIGN_FETCH_TYPE(u8,  u8,  0),
+	ASSIGN_FETCH_TYPE(u16, u16, 0),
+	ASSIGN_FETCH_TYPE(u32, u32, 0),
+	ASSIGN_FETCH_TYPE(u64, u64, 0),
+	ASSIGN_FETCH_TYPE(s8,  u8,  1),
+	ASSIGN_FETCH_TYPE(s16, u16, 1),
+	ASSIGN_FETCH_TYPE(s32, u32, 1),
+	ASSIGN_FETCH_TYPE(s64, u64, 1),
+
+	ASSIGN_FETCH_TYPE_END
+};
+
 /*
  * Allocate new trace_probe and initialize it (including kprobes).
  */
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index c26bc9e..541036e 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -54,10 +54,6 @@ DEFINE_BASIC_PRINT_TYPE_FUNC(s16, "%d")
 DEFINE_BASIC_PRINT_TYPE_FUNC(s32, "%d")
 DEFINE_BASIC_PRINT_TYPE_FUNC(s64, "%Ld")
 
-/* For defining macros, define string/string_size types */
-typedef u32 string;
-typedef u32 string_size;
-
 /* Print type function for string type */
 __kprobes int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s,
 						  const char *name,
@@ -74,7 +70,6 @@ __kprobes int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s,
 
 const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\"";
 
-#define FETCH_FUNC_NAME(method, type)	fetch_##method##_##type
 /*
  * Define macro for basic types - we don't need to define s* types, because
  * we have to care only about bitwidth at recording time.
@@ -359,25 +354,8 @@ free_bitfield_fetch_param(struct bitfield_fetch_param *data)
 	kfree(data);
 }
 
-/* Fetch type information table */
-static const struct fetch_type fetch_type_table[] = {
-	/* Special types */
-	[FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string,
-					sizeof(u32), 1, "__data_loc char[]"),
-	[FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32,
-					string_size, sizeof(u32), 0, "u32"),
-	/* Basic types */
-	ASSIGN_FETCH_TYPE(u8,  u8,  0),
-	ASSIGN_FETCH_TYPE(u16, u16, 0),
-	ASSIGN_FETCH_TYPE(u32, u32, 0),
-	ASSIGN_FETCH_TYPE(u64, u64, 0),
-	ASSIGN_FETCH_TYPE(s8,  u8,  1),
-	ASSIGN_FETCH_TYPE(s16, u16, 1),
-	ASSIGN_FETCH_TYPE(s32, u32, 1),
-	ASSIGN_FETCH_TYPE(s64, u64, 1),
-};
-
-static const struct fetch_type *find_fetch_type(const char *type)
+static const struct fetch_type *find_fetch_type(const char *type,
+						const struct fetch_type *ftbl)
 {
 	int i;
 
@@ -398,21 +376,22 @@ static const struct fetch_type *find_fetch_type(const char *type)
 
 		switch (bs) {
 		case 8:
-			return find_fetch_type("u8");
+			return find_fetch_type("u8", ftbl);
 		case 16:
-			return find_fetch_type("u16");
+			return find_fetch_type("u16", ftbl);
 		case 32:
-			return find_fetch_type("u32");
+			return find_fetch_type("u32", ftbl);
 		case 64:
-			return find_fetch_type("u64");
+			return find_fetch_type("u64", ftbl);
 		default:
 			goto fail;
 		}
 	}
 
-	for (i = 0; i < ARRAY_SIZE(fetch_type_table); i++)
-		if (strcmp(type, fetch_type_table[i].name) == 0)
-			return &fetch_type_table[i];
+	for (i = 0; ftbl[i].name; i++) {
+		if (strcmp(type, ftbl[i].name) == 0)
+			return &ftbl[i];
+	}
 
 fail:
 	return NULL;
@@ -426,16 +405,17 @@ static __kprobes void fetch_stack_address(struct pt_regs *regs,
 }
 
 static fetch_func_t get_fetch_size_function(const struct fetch_type *type,
-					fetch_func_t orig_fn)
+					    fetch_func_t orig_fn,
+					    const struct fetch_type *ftbl)
 {
 	int i;
 
-	if (type != &fetch_type_table[FETCH_TYPE_STRING])
+	if (type != &ftbl[FETCH_TYPE_STRING])
 		return NULL;	/* Only string type needs size function */
 
 	for (i = 0; i < FETCH_MTD_END; i++)
 		if (type->fetch[i] == orig_fn)
-			return fetch_type_table[FETCH_TYPE_STRSIZE].fetch[i];
+			return ftbl[FETCH_TYPE_STRSIZE].fetch[i];
 
 	WARN_ON(1);	/* This should not happen */
 
@@ -504,12 +484,14 @@ static int parse_probe_vars(char *arg, const struct fetch_type *t,
 static int parse_probe_arg(char *arg, const struct fetch_type *t,
 		     struct fetch_param *f, bool is_return, bool is_kprobe)
 {
+	const struct fetch_type *ftbl;
 	unsigned long param;
 	long offset;
 	char *tmp;
-	int ret;
+	int ret = 0;
 
-	ret = 0;
+	ftbl = is_kprobe ? kprobes_fetch_type_table : uprobes_fetch_type_table;
+	BUG_ON(ftbl == NULL);
 
 	/* Until uprobe_events supports only reg arguments */
 	if (!is_kprobe && arg[0] != '%')
@@ -568,7 +550,7 @@ static int parse_probe_arg(char *arg, const struct fetch_type *t,
 			struct deref_fetch_param	*dprm;
 			const struct fetch_type		*t2;
 
-			t2 = find_fetch_type(NULL);
+			t2 = find_fetch_type(NULL, ftbl);
 			*tmp = '\0';
 			dprm = kzalloc(sizeof(struct deref_fetch_param), GFP_KERNEL);
 
@@ -637,9 +619,13 @@ static int __parse_bitfield_probe_arg(const char *bf,
 int traceprobe_parse_probe_arg(char *arg, ssize_t *size,
 		struct probe_arg *parg, bool is_return, bool is_kprobe)
 {
+	const struct fetch_type *ftbl;
 	const char *t;
 	int ret;
 
+	ftbl = is_kprobe ? kprobes_fetch_type_table : uprobes_fetch_type_table;
+	BUG_ON(ftbl == NULL);
+
 	if (strlen(arg) > MAX_ARGSTR_LEN) {
 		pr_info("Argument is too long.: %s\n",  arg);
 		return -ENOSPC;
@@ -654,7 +640,7 @@ int traceprobe_parse_probe_arg(char *arg, ssize_t *size,
 		arg[t - parg->comm] = '\0';
 		t++;
 	}
-	parg->type = find_fetch_type(t);
+	parg->type = find_fetch_type(t, ftbl);
 	if (!parg->type) {
 		pr_info("Unsupported type: %s\n", t);
 		return -EINVAL;
@@ -668,7 +654,8 @@ int traceprobe_parse_probe_arg(char *arg, ssize_t *size,
 
 	if (ret >= 0) {
 		parg->fetch_size.fn = get_fetch_size_function(parg->type,
-							      parg->fetch.fn);
+							      parg->fetch.fn,
+							      ftbl);
 		parg->fetch_size.data = parg->fetch.data;
 	}
 
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index bd621c0..5b77798 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -126,6 +126,10 @@ struct fetch_param {
 	void 			*data;
 };
 
+/* For defining macros, define string/string_size types */
+typedef u32 string;
+typedef u32 string_size;
+
 #define PRINT_TYPE_FUNC_NAME(type)	print_type_##type
 #define PRINT_TYPE_FMT_NAME(type)	print_type_format_##type
 
@@ -146,6 +150,47 @@ DECLARE_BASIC_PRINT_TYPE_FUNC(s32);
 DECLARE_BASIC_PRINT_TYPE_FUNC(s64);
 DECLARE_BASIC_PRINT_TYPE_FUNC(string);
 
+#define FETCH_FUNC_NAME(method, type)	fetch_##method##_##type
+
+/* Declare macro for basic types */
+#define DECLARE_FETCH_FUNC(method, type)				\
+extern void FETCH_FUNC_NAME(method, type)(struct pt_regs *regs, 	\
+					  void *data, void *dest)
+
+#define DECLARE_BASIC_FETCH_FUNCS(method) 	\
+DECLARE_FETCH_FUNC(method, u8);			\
+DECLARE_FETCH_FUNC(method, u16);		\
+DECLARE_FETCH_FUNC(method, u32);		\
+DECLARE_FETCH_FUNC(method, u64)
+
+DECLARE_BASIC_FETCH_FUNCS(reg);
+#define fetch_reg_string			NULL
+#define fetch_reg_string_size			NULL
+
+DECLARE_BASIC_FETCH_FUNCS(stack);
+#define fetch_stack_string			NULL
+#define fetch_stack_string_size			NULL
+
+DECLARE_BASIC_FETCH_FUNCS(retval);
+#define fetch_retval_string			NULL
+#define fetch_retval_string_size		NULL
+
+DECLARE_BASIC_FETCH_FUNCS(memory);
+DECLARE_FETCH_FUNC(memory, string);
+DECLARE_FETCH_FUNC(memory, string_size);
+
+DECLARE_BASIC_FETCH_FUNCS(symbol);
+DECLARE_FETCH_FUNC(symbol, string);
+DECLARE_FETCH_FUNC(symbol, string_size);
+
+DECLARE_BASIC_FETCH_FUNCS(deref);
+DECLARE_FETCH_FUNC(deref, string);
+DECLARE_FETCH_FUNC(deref, string_size);
+
+DECLARE_BASIC_FETCH_FUNCS(bitfield);
+#define fetch_bitfield_string			NULL
+#define fetch_bitfield_string_size		NULL
+
 /* Default (unsigned long) fetch type */
 #define __DEFAULT_FETCH_TYPE(t) u##t
 #define _DEFAULT_FETCH_TYPE(t) __DEFAULT_FETCH_TYPE(t)
@@ -176,9 +221,17 @@ ASSIGN_FETCH_FUNC(bitfield, ftype),			\
 #define ASSIGN_FETCH_TYPE(ptype, ftype, sign)			\
 	__ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, #ptype)
 
+#define ASSIGN_FETCH_TYPE_END {}
+
 #define FETCH_TYPE_STRING	0
 #define FETCH_TYPE_STRSIZE	1
 
+/*
+ * Fetch type information table.
+ * It's declared as a weak symbol due to conditional compilation.
+ */
+extern __weak const struct fetch_type kprobes_fetch_type_table[];
+extern __weak const struct fetch_type uprobes_fetch_type_table[];
 
 struct probe_arg {
 	struct fetch_param	fetch;
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index b233d9c..2c60925 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -74,6 +74,26 @@ static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs);
 static int uretprobe_dispatcher(struct uprobe_consumer *con,
 				unsigned long func, struct pt_regs *regs);
 
+/* Fetch type information table */
+const struct fetch_type uprobes_fetch_type_table[] = {
+	/* Special types */
+	[FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string,
+					sizeof(u32), 1, "__data_loc char[]"),
+	[FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32,
+					string_size, sizeof(u32), 0, "u32"),
+	/* Basic types */
+	ASSIGN_FETCH_TYPE(u8,  u8,  0),
+	ASSIGN_FETCH_TYPE(u16, u16, 0),
+	ASSIGN_FETCH_TYPE(u32, u32, 0),
+	ASSIGN_FETCH_TYPE(u64, u64, 0),
+	ASSIGN_FETCH_TYPE(s8,  u8,  1),
+	ASSIGN_FETCH_TYPE(s16, u16, 1),
+	ASSIGN_FETCH_TYPE(s32, u32, 1),
+	ASSIGN_FETCH_TYPE(s64, u64, 1),
+
+	ASSIGN_FETCH_TYPE_END
+};
+
 static inline void init_trace_uprobe_filter(struct trace_uprobe_filter *filter)
 {
 	rwlock_init(&filter->rwlock);
-- 
1.8.4.3

[for-next][PATCH 09/17] tracing/probes: Implement stack fetch method for uprobes

[Steven Rostedt]

[-- Attachment #1: 0009-tracing-probes-Implement-stack-fetch-method-for-upro.patch --]
[-- Type: text/plain, Size: 5789 bytes --]

From: Namhyung Kim <namhyung.kim@lge.com>

Use separate method to fetch from stack.  Move existing functions to
trace_kprobe.c and make them static.  Also add new stack fetch
implementation for uprobes.

Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 kernel/trace/trace_kprobe.c | 15 +++++++++++++++
 kernel/trace/trace_probe.c  | 22 ----------------------
 kernel/trace/trace_probe.h  | 14 ++++++++++----
 kernel/trace/trace_uprobe.c | 41 +++++++++++++++++++++++++++++++++++++++++
 4 files changed, 66 insertions(+), 26 deletions(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index fe3f00c..389f9e4 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -88,6 +88,21 @@ static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs);
 static int kretprobe_dispatcher(struct kretprobe_instance *ri,
 				struct pt_regs *regs);
 
+/*
+ * Kprobes-specific fetch functions
+ */
+#define DEFINE_FETCH_stack(type)					\
+static __kprobes void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,\
+					  void *offset, void *dest)	\
+{									\
+	*(type *)dest = (type)regs_get_kernel_stack_nth(regs,		\
+				(unsigned int)((unsigned long)offset));	\
+}
+DEFINE_BASIC_FETCH_FUNCS(stack)
+/* No string on the stack entry */
+#define fetch_stack_string	NULL
+#define fetch_stack_string_size	NULL
+
 /* Fetch type information table */
 const struct fetch_type kprobes_fetch_type_table[] = {
 	/* Special types */
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 541036e..77aa7d1 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -70,16 +70,6 @@ __kprobes int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s,
 
 const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\"";
 
-/*
- * Define macro for basic types - we don't need to define s* types, because
- * we have to care only about bitwidth at recording time.
- */
-#define DEFINE_BASIC_FETCH_FUNCS(method) \
-DEFINE_FETCH_##method(u8)		\
-DEFINE_FETCH_##method(u16)		\
-DEFINE_FETCH_##method(u32)		\
-DEFINE_FETCH_##method(u64)
-
 #define CHECK_FETCH_FUNCS(method, fn)			\
 	(((FETCH_FUNC_NAME(method, u8) == fn) ||	\
 	  (FETCH_FUNC_NAME(method, u16) == fn) ||	\
@@ -102,18 +92,6 @@ DEFINE_BASIC_FETCH_FUNCS(reg)
 #define fetch_reg_string	NULL
 #define fetch_reg_string_size	NULL
 
-#define DEFINE_FETCH_stack(type)					\
-__kprobes void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,	\
-					  void *offset, void *dest)	\
-{									\
-	*(type *)dest = (type)regs_get_kernel_stack_nth(regs,		\
-				(unsigned int)((unsigned long)offset));	\
-}
-DEFINE_BASIC_FETCH_FUNCS(stack)
-/* No string on the stack entry */
-#define fetch_stack_string	NULL
-#define fetch_stack_string_size	NULL
-
 #define DEFINE_FETCH_retval(type)					\
 __kprobes void FETCH_FUNC_NAME(retval, type)(struct pt_regs *regs,	\
 					  void *dummy, void *dest)	\
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index 5b77798..8211dd6 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -167,10 +167,6 @@ DECLARE_BASIC_FETCH_FUNCS(reg);
 #define fetch_reg_string			NULL
 #define fetch_reg_string_size			NULL
 
-DECLARE_BASIC_FETCH_FUNCS(stack);
-#define fetch_stack_string			NULL
-#define fetch_stack_string_size			NULL
-
 DECLARE_BASIC_FETCH_FUNCS(retval);
 #define fetch_retval_string			NULL
 #define fetch_retval_string_size		NULL
@@ -191,6 +187,16 @@ DECLARE_BASIC_FETCH_FUNCS(bitfield);
 #define fetch_bitfield_string			NULL
 #define fetch_bitfield_string_size		NULL
 
+/*
+ * Define macro for basic types - we don't need to define s* types, because
+ * we have to care only about bitwidth at recording time.
+ */
+#define DEFINE_BASIC_FETCH_FUNCS(method) \
+DEFINE_FETCH_##method(u8)		\
+DEFINE_FETCH_##method(u16)		\
+DEFINE_FETCH_##method(u32)		\
+DEFINE_FETCH_##method(u64)
+
 /* Default (unsigned long) fetch type */
 #define __DEFAULT_FETCH_TYPE(t) u##t
 #define _DEFAULT_FETCH_TYPE(t) __DEFAULT_FETCH_TYPE(t)
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 2c60925..5395d37 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -74,6 +74,47 @@ static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs);
 static int uretprobe_dispatcher(struct uprobe_consumer *con,
 				unsigned long func, struct pt_regs *regs);
 
+#ifdef CONFIG_STACK_GROWSUP
+static unsigned long adjust_stack_addr(unsigned long addr, unsigned int n)
+{
+	return addr - (n * sizeof(long));
+}
+#else
+static unsigned long adjust_stack_addr(unsigned long addr, unsigned int n)
+{
+	return addr + (n * sizeof(long));
+}
+#endif
+
+static unsigned long get_user_stack_nth(struct pt_regs *regs, unsigned int n)
+{
+	unsigned long ret;
+	unsigned long addr = user_stack_pointer(regs);
+
+	addr = adjust_stack_addr(addr, n);
+
+	if (copy_from_user(&ret, (void __force __user *) addr, sizeof(ret)))
+		return 0;
+
+	return ret;
+}
+
+/*
+ * Uprobes-specific fetch functions
+ */
+#define DEFINE_FETCH_stack(type)					\
+static __kprobes void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,\
+					  void *offset, void *dest)	\
+{									\
+	*(type *)dest = (type)get_user_stack_nth(regs,			\
+					      ((unsigned long)offset)); \
+}
+DEFINE_BASIC_FETCH_FUNCS(stack)
+/* No string on the stack entry */
+#define fetch_stack_string	NULL
+#define fetch_stack_string_size	NULL
+
+
 /* Fetch type information table */
 const struct fetch_type uprobes_fetch_type_table[] = {
 	/* Special types */
-- 
1.8.4.3

[for-next][PATCH 10/17] tracing/probes: Move symbol fetch method to kprobes

[Steven Rostedt]

[-- Attachment #1: 0010-tracing-probes-Move-symbol-fetch-method-to-kprobes.patch --]
[-- Type: text/plain, Size: 6071 bytes --]

From: Namhyung Kim <namhyung.kim@lge.com>

Move existing functions to trace_kprobe.c and add NULL entries to the
uprobes fetch type table.  I don't make them static since some generic
routines like update/free_XXX_fetch_param() require pointers to the
functions.

Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 kernel/trace/trace_kprobe.c | 59 +++++++++++++++++++++++++++++++++++++++++++++
 kernel/trace/trace_probe.c  | 59 ---------------------------------------------
 kernel/trace/trace_probe.h  | 24 ++++++++++++++++++
 kernel/trace/trace_uprobe.c |  8 ++++++
 4 files changed, 91 insertions(+), 59 deletions(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 389f9e4..d2a4fd2 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -88,6 +88,51 @@ static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs);
 static int kretprobe_dispatcher(struct kretprobe_instance *ri,
 				struct pt_regs *regs);
 
+/* Memory fetching by symbol */
+struct symbol_cache {
+	char		*symbol;
+	long		offset;
+	unsigned long	addr;
+};
+
+unsigned long update_symbol_cache(struct symbol_cache *sc)
+{
+	sc->addr = (unsigned long)kallsyms_lookup_name(sc->symbol);
+
+	if (sc->addr)
+		sc->addr += sc->offset;
+
+	return sc->addr;
+}
+
+void free_symbol_cache(struct symbol_cache *sc)
+{
+	kfree(sc->symbol);
+	kfree(sc);
+}
+
+struct symbol_cache *alloc_symbol_cache(const char *sym, long offset)
+{
+	struct symbol_cache *sc;
+
+	if (!sym || strlen(sym) == 0)
+		return NULL;
+
+	sc = kzalloc(sizeof(struct symbol_cache), GFP_KERNEL);
+	if (!sc)
+		return NULL;
+
+	sc->symbol = kstrdup(sym, GFP_KERNEL);
+	if (!sc->symbol) {
+		kfree(sc);
+		return NULL;
+	}
+	sc->offset = offset;
+	update_symbol_cache(sc);
+
+	return sc;
+}
+
 /*
  * Kprobes-specific fetch functions
  */
@@ -103,6 +148,20 @@ DEFINE_BASIC_FETCH_FUNCS(stack)
 #define fetch_stack_string	NULL
 #define fetch_stack_string_size	NULL
 
+#define DEFINE_FETCH_symbol(type)					\
+__kprobes void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs,	\
+					  void *data, void *dest)	\
+{									\
+	struct symbol_cache *sc = data;					\
+	if (sc->addr)							\
+		fetch_memory_##type(regs, (void *)sc->addr, dest);	\
+	else								\
+		*(type *)dest = 0;					\
+}
+DEFINE_BASIC_FETCH_FUNCS(symbol)
+DEFINE_FETCH_symbol(string)
+DEFINE_FETCH_symbol(string_size)
+
 /* Fetch type information table */
 const struct fetch_type kprobes_fetch_type_table[] = {
 	/* Special types */
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 77aa7d1..a31ad47 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -180,65 +180,6 @@ __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
 		*(u32 *)dest = len;
 }
 
-/* Memory fetching by symbol */
-struct symbol_cache {
-	char		*symbol;
-	long		offset;
-	unsigned long	addr;
-};
-
-static unsigned long update_symbol_cache(struct symbol_cache *sc)
-{
-	sc->addr = (unsigned long)kallsyms_lookup_name(sc->symbol);
-
-	if (sc->addr)
-		sc->addr += sc->offset;
-
-	return sc->addr;
-}
-
-static void free_symbol_cache(struct symbol_cache *sc)
-{
-	kfree(sc->symbol);
-	kfree(sc);
-}
-
-static struct symbol_cache *alloc_symbol_cache(const char *sym, long offset)
-{
-	struct symbol_cache *sc;
-
-	if (!sym || strlen(sym) == 0)
-		return NULL;
-
-	sc = kzalloc(sizeof(struct symbol_cache), GFP_KERNEL);
-	if (!sc)
-		return NULL;
-
-	sc->symbol = kstrdup(sym, GFP_KERNEL);
-	if (!sc->symbol) {
-		kfree(sc);
-		return NULL;
-	}
-	sc->offset = offset;
-	update_symbol_cache(sc);
-
-	return sc;
-}
-
-#define DEFINE_FETCH_symbol(type)					\
-__kprobes void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs,	\
-					  void *data, void *dest)	\
-{									\
-	struct symbol_cache *sc = data;					\
-	if (sc->addr)							\
-		fetch_memory_##type(regs, (void *)sc->addr, dest);	\
-	else								\
-		*(type *)dest = 0;					\
-}
-DEFINE_BASIC_FETCH_FUNCS(symbol)
-DEFINE_FETCH_symbol(string)
-DEFINE_FETCH_symbol(string_size)
-
 /* Dereference memory access function */
 struct deref_fetch_param {
 	struct fetch_param	orig;
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index 8211dd6..8be8455 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -239,6 +239,30 @@ ASSIGN_FETCH_FUNC(bitfield, ftype),			\
 extern __weak const struct fetch_type kprobes_fetch_type_table[];
 extern __weak const struct fetch_type uprobes_fetch_type_table[];
 
+#ifdef CONFIG_KPROBE_EVENT
+struct symbol_cache;
+unsigned long update_symbol_cache(struct symbol_cache *sc);
+void free_symbol_cache(struct symbol_cache *sc);
+struct symbol_cache *alloc_symbol_cache(const char *sym, long offset);
+#else
+struct symbol_cache {
+};
+static inline unsigned long __used update_symbol_cache(struct symbol_cache *sc)
+{
+	return 0;
+}
+
+static inline void __used free_symbol_cache(struct symbol_cache *sc)
+{
+}
+
+static inline struct symbol_cache * __used
+alloc_symbol_cache(const char *sym, long offset)
+{
+	return NULL;
+}
+#endif /* CONFIG_KPROBE_EVENT */
+
 struct probe_arg {
 	struct fetch_param	fetch;
 	struct fetch_param	fetch_size;
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 5395d37..24ef6a3 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -115,6 +115,14 @@ DEFINE_BASIC_FETCH_FUNCS(stack)
 #define fetch_stack_string_size	NULL
 
 
+/* uprobes do not support symbol fetch methods */
+#define fetch_symbol_u8			NULL
+#define fetch_symbol_u16		NULL
+#define fetch_symbol_u32		NULL
+#define fetch_symbol_u64		NULL
+#define fetch_symbol_string		NULL
+#define fetch_symbol_string_size	NULL
+
 /* Fetch type information table */
 const struct fetch_type uprobes_fetch_type_table[] = {
 	/* Special types */
-- 
1.8.4.3

[for-next][PATCH 11/17] tracing/probes: Add fetch{,_size} member into deref fetch method

[Steven Rostedt]

[-- Attachment #1: 0011-tracing-probes-Add-fetch-_size-member-into-deref-fet.patch --]
[-- Type: text/plain, Size: 2481 bytes --]

From: Hyeoncheol Lee <cheol.lee@lge.com>

The deref fetch methods access a memory region but it assumes that
it's a kernel memory since uprobes does not support them.

Add ->fetch and ->fetch_size member in order to provide a proper
access methods for supporting uprobes.

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Hyeoncheol Lee <cheol.lee@lge.com>
[namhyung@kernel.org: Split original patch into pieces as requested]
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 kernel/trace/trace_probe.c | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index a31ad47..8d7231d 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -184,6 +184,8 @@ __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
 struct deref_fetch_param {
 	struct fetch_param	orig;
 	long			offset;
+	fetch_func_t		fetch;
+	fetch_func_t		fetch_size;
 };
 
 #define DEFINE_FETCH_deref(type)					\
@@ -195,13 +197,26 @@ __kprobes void FETCH_FUNC_NAME(deref, type)(struct pt_regs *regs,	\
 	call_fetch(&dprm->orig, regs, &addr);				\
 	if (addr) {							\
 		addr += dprm->offset;					\
-		fetch_memory_##type(regs, (void *)addr, dest);		\
+		dprm->fetch(regs, (void *)addr, dest);			\
 	} else								\
 		*(type *)dest = 0;					\
 }
 DEFINE_BASIC_FETCH_FUNCS(deref)
 DEFINE_FETCH_deref(string)
-DEFINE_FETCH_deref(string_size)
+
+__kprobes void FETCH_FUNC_NAME(deref, string_size)(struct pt_regs *regs,
+						   void *data, void *dest)
+{
+	struct deref_fetch_param *dprm = data;
+	unsigned long addr;
+
+	call_fetch(&dprm->orig, regs, &addr);
+	if (addr && dprm->fetch_size) {
+		addr += dprm->offset;
+		dprm->fetch_size(regs, (void *)addr, dest);
+	} else
+		*(string_size *)dest = 0;
+}
 
 static __kprobes void update_deref_fetch_param(struct deref_fetch_param *data)
 {
@@ -477,6 +492,9 @@ static int parse_probe_arg(char *arg, const struct fetch_type *t,
 				return -ENOMEM;
 
 			dprm->offset = offset;
+			dprm->fetch = t->fetch[FETCH_MTD_memory];
+			dprm->fetch_size = get_fetch_size_function(t,
+							dprm->fetch, ftbl);
 			ret = parse_probe_arg(arg, t2, &dprm->orig, is_return,
 							is_kprobe);
 			if (ret)
-- 
1.8.4.3

[for-next][PATCH 12/17] tracing/probes: Implement memory fetch method for uprobes

[Steven Rostedt]

[-- Attachment #1: 0012-tracing-probes-Implement-memory-fetch-method-for-upr.patch --]
[-- Type: text/plain, Size: 7904 bytes --]

From: Namhyung Kim <namhyung.kim@lge.com>

Use separate method to fetch from memory.  Move existing functions to
trace_kprobe.c and make them static.  Also add new memory fetch
implementation for uprobes.

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 kernel/trace/trace_kprobe.c | 77 +++++++++++++++++++++++++++++++++++++++++++++
 kernel/trace/trace_probe.c  | 77 ---------------------------------------------
 kernel/trace/trace_probe.h  |  4 ---
 kernel/trace/trace_uprobe.c | 52 ++++++++++++++++++++++++++++++
 4 files changed, 129 insertions(+), 81 deletions(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index d2a4fd2..f94a569 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -148,6 +148,83 @@ DEFINE_BASIC_FETCH_FUNCS(stack)
 #define fetch_stack_string	NULL
 #define fetch_stack_string_size	NULL
 
+#define DEFINE_FETCH_memory(type)					\
+static __kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,\
+					  void *addr, void *dest)	\
+{									\
+	type retval;							\
+	if (probe_kernel_address(addr, retval))				\
+		*(type *)dest = 0;					\
+	else								\
+		*(type *)dest = retval;					\
+}
+DEFINE_BASIC_FETCH_FUNCS(memory)
+/*
+ * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max
+ * length and relative data location.
+ */
+static __kprobes void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
+						      void *addr, void *dest)
+{
+	long ret;
+	int maxlen = get_rloc_len(*(u32 *)dest);
+	u8 *dst = get_rloc_data(dest);
+	u8 *src = addr;
+	mm_segment_t old_fs = get_fs();
+
+	if (!maxlen)
+		return;
+
+	/*
+	 * Try to get string again, since the string can be changed while
+	 * probing.
+	 */
+	set_fs(KERNEL_DS);
+	pagefault_disable();
+
+	do
+		ret = __copy_from_user_inatomic(dst++, src++, 1);
+	while (dst[-1] && ret == 0 && src - (u8 *)addr < maxlen);
+
+	dst[-1] = '\0';
+	pagefault_enable();
+	set_fs(old_fs);
+
+	if (ret < 0) {	/* Failed to fetch string */
+		((u8 *)get_rloc_data(dest))[0] = '\0';
+		*(u32 *)dest = make_data_rloc(0, get_rloc_offs(*(u32 *)dest));
+	} else {
+		*(u32 *)dest = make_data_rloc(src - (u8 *)addr,
+					      get_rloc_offs(*(u32 *)dest));
+	}
+}
+
+/* Return the length of string -- including null terminal byte */
+static __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
+							void *addr, void *dest)
+{
+	mm_segment_t old_fs;
+	int ret, len = 0;
+	u8 c;
+
+	old_fs = get_fs();
+	set_fs(KERNEL_DS);
+	pagefault_disable();
+
+	do {
+		ret = __copy_from_user_inatomic(&c, (u8 *)addr + len, 1);
+		len++;
+	} while (c && ret == 0 && len < MAX_STRING_SIZE);
+
+	pagefault_enable();
+	set_fs(old_fs);
+
+	if (ret < 0)	/* Failed to check the length */
+		*(u32 *)dest = 0;
+	else
+		*(u32 *)dest = len;
+}
+
 #define DEFINE_FETCH_symbol(type)					\
 __kprobes void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs,	\
 					  void *data, void *dest)	\
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 8d7231d..8f7a2b6d 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -103,83 +103,6 @@ DEFINE_BASIC_FETCH_FUNCS(retval)
 #define fetch_retval_string		NULL
 #define fetch_retval_string_size	NULL
 
-#define DEFINE_FETCH_memory(type)					\
-__kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,	\
-					  void *addr, void *dest)	\
-{									\
-	type retval;							\
-	if (probe_kernel_address(addr, retval))				\
-		*(type *)dest = 0;					\
-	else								\
-		*(type *)dest = retval;					\
-}
-DEFINE_BASIC_FETCH_FUNCS(memory)
-/*
- * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max
- * length and relative data location.
- */
-__kprobes void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
-						      void *addr, void *dest)
-{
-	long ret;
-	int maxlen = get_rloc_len(*(u32 *)dest);
-	u8 *dst = get_rloc_data(dest);
-	u8 *src = addr;
-	mm_segment_t old_fs = get_fs();
-
-	if (!maxlen)
-		return;
-
-	/*
-	 * Try to get string again, since the string can be changed while
-	 * probing.
-	 */
-	set_fs(KERNEL_DS);
-	pagefault_disable();
-
-	do
-		ret = __copy_from_user_inatomic(dst++, src++, 1);
-	while (dst[-1] && ret == 0 && src - (u8 *)addr < maxlen);
-
-	dst[-1] = '\0';
-	pagefault_enable();
-	set_fs(old_fs);
-
-	if (ret < 0) {	/* Failed to fetch string */
-		((u8 *)get_rloc_data(dest))[0] = '\0';
-		*(u32 *)dest = make_data_rloc(0, get_rloc_offs(*(u32 *)dest));
-	} else {
-		*(u32 *)dest = make_data_rloc(src - (u8 *)addr,
-					      get_rloc_offs(*(u32 *)dest));
-	}
-}
-
-/* Return the length of string -- including null terminal byte */
-__kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
-							void *addr, void *dest)
-{
-	mm_segment_t old_fs;
-	int ret, len = 0;
-	u8 c;
-
-	old_fs = get_fs();
-	set_fs(KERNEL_DS);
-	pagefault_disable();
-
-	do {
-		ret = __copy_from_user_inatomic(&c, (u8 *)addr + len, 1);
-		len++;
-	} while (c && ret == 0 && len < MAX_STRING_SIZE);
-
-	pagefault_enable();
-	set_fs(old_fs);
-
-	if (ret < 0)	/* Failed to check the length */
-		*(u32 *)dest = 0;
-	else
-		*(u32 *)dest = len;
-}
-
 /* Dereference memory access function */
 struct deref_fetch_param {
 	struct fetch_param	orig;
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index 8be8455..2d5b8f5 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -171,10 +171,6 @@ DECLARE_BASIC_FETCH_FUNCS(retval);
 #define fetch_retval_string			NULL
 #define fetch_retval_string_size		NULL
 
-DECLARE_BASIC_FETCH_FUNCS(memory);
-DECLARE_FETCH_FUNC(memory, string);
-DECLARE_FETCH_FUNC(memory, string_size);
-
 DECLARE_BASIC_FETCH_FUNCS(symbol);
 DECLARE_FETCH_FUNC(symbol, string);
 DECLARE_FETCH_FUNC(symbol, string_size);
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 24ef6a3..bebd2f5 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -114,6 +114,58 @@ DEFINE_BASIC_FETCH_FUNCS(stack)
 #define fetch_stack_string	NULL
 #define fetch_stack_string_size	NULL
 
+#define DEFINE_FETCH_memory(type)					\
+static __kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,\
+						void *addr, void *dest) \
+{									\
+	type retval;							\
+	void __user *vaddr = (void __force __user *) addr;		\
+									\
+	if (copy_from_user(&retval, vaddr, sizeof(type)))		\
+		*(type *)dest = 0;					\
+	else								\
+		*(type *) dest = retval;				\
+}
+DEFINE_BASIC_FETCH_FUNCS(memory)
+/*
+ * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max
+ * length and relative data location.
+ */
+static __kprobes void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
+						      void *addr, void *dest)
+{
+	long ret;
+	u32 rloc = *(u32 *)dest;
+	int maxlen  = get_rloc_len(rloc);
+	u8 *dst = get_rloc_data(dest);
+	void __user *src = (void __force __user *) addr;
+
+	if (!maxlen)
+		return;
+
+	ret = strncpy_from_user(dst, src, maxlen);
+
+	if (ret < 0) {	/* Failed to fetch string */
+		((u8 *)get_rloc_data(dest))[0] = '\0';
+		*(u32 *)dest = make_data_rloc(0, get_rloc_offs(rloc));
+	} else {
+		*(u32 *)dest = make_data_rloc(ret, get_rloc_offs(rloc));
+	}
+}
+
+static __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
+						      void *addr, void *dest)
+{
+	int len;
+	void __user *vaddr = (void __force __user *) addr;
+
+	len = strnlen_user(vaddr, MAX_STRING_SIZE);
+
+	if (len == 0 || len > MAX_STRING_SIZE)  /* Failed to check length */
+		*(u32 *)dest = 0;
+	else
+		*(u32 *)dest = len;
+}
 
 /* uprobes do not support symbol fetch methods */
 #define fetch_symbol_u8			NULL
-- 
1.8.4.3

[for-next][PATCH 13/17] tracing/uprobes: Pass is_return to traceprobe_parse_probe_arg()

[Steven Rostedt]

[-- Attachment #1: 0013-tracing-uprobes-Pass-is_return-to-traceprobe_parse_p.patch --]
[-- Type: text/plain, Size: 1083 bytes --]

From: Namhyung Kim <namhyung.kim@lge.com>

Currently uprobes don't pass is_return to the argument parser so that
it cannot make use of "$retval" fetch method since it only works for
return probes.

Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 kernel/trace/trace_uprobe.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index bebd2f5..8bfd29a 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -514,7 +514,7 @@ static int create_trace_uprobe(int argc, char **argv)
 
 		/* Parse fetch argument */
 		ret = traceprobe_parse_probe_arg(arg, &tu->tp.size, parg,
-						 false, false);
+						 is_return, false);
 		if (ret) {
 			pr_info("Parse error at argument[%d]. (%d)\n", i, ret);
 			goto error;
-- 
1.8.4.3

[for-next][PATCH 14/17] tracing/uprobes: Fetch args before reserving a ring buffer

[Steven Rostedt]

[-- Attachment #1: 0014-tracing-uprobes-Fetch-args-before-reserving-a-ring-b.patch --]
[-- Type: text/plain, Size: 6673 bytes --]

From: Namhyung Kim <namhyung.kim@lge.com>

Fetching from user space should be done in a non-atomic context.  So
use a per-cpu buffer and copy its content to the ring buffer
atomically.  Note that we can migrate during accessing user memory
thus use a per-cpu mutex to protect concurrent accesses.

This is needed since we'll be able to fetch args from an user memory
which can be swapped out.  Before that uprobes could fetch args from
registers only which saved in a kernel space.

While at it, use __get_data_size() and store_trace_args() to reduce
code duplication.  And add struct uprobe_cpu_buffer and its helpers as
suggested by Oleg.

Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 kernel/trace/trace_uprobe.c | 146 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 132 insertions(+), 14 deletions(-)

diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 8bfd29a..794e8bc 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -652,21 +652,117 @@ static const struct file_operations uprobe_profile_ops = {
 	.release	= seq_release,
 };
 
+struct uprobe_cpu_buffer {
+	struct mutex mutex;
+	void *buf;
+};
+static struct uprobe_cpu_buffer __percpu *uprobe_cpu_buffer;
+static int uprobe_buffer_refcnt;
+
+static int uprobe_buffer_init(void)
+{
+	int cpu, err_cpu;
+
+	uprobe_cpu_buffer = alloc_percpu(struct uprobe_cpu_buffer);
+	if (uprobe_cpu_buffer == NULL)
+		return -ENOMEM;
+
+	for_each_possible_cpu(cpu) {
+		struct page *p = alloc_pages_node(cpu_to_node(cpu),
+						  GFP_KERNEL, 0);
+		if (p == NULL) {
+			err_cpu = cpu;
+			goto err;
+		}
+		per_cpu_ptr(uprobe_cpu_buffer, cpu)->buf = page_address(p);
+		mutex_init(&per_cpu_ptr(uprobe_cpu_buffer, cpu)->mutex);
+	}
+
+	return 0;
+
+err:
+	for_each_possible_cpu(cpu) {
+		if (cpu == err_cpu)
+			break;
+		free_page((unsigned long)per_cpu_ptr(uprobe_cpu_buffer, cpu)->buf);
+	}
+
+	free_percpu(uprobe_cpu_buffer);
+	return -ENOMEM;
+}
+
+static int uprobe_buffer_enable(void)
+{
+	int ret = 0;
+
+	BUG_ON(!mutex_is_locked(&event_mutex));
+
+	if (uprobe_buffer_refcnt++ == 0) {
+		ret = uprobe_buffer_init();
+		if (ret < 0)
+			uprobe_buffer_refcnt--;
+	}
+
+	return ret;
+}
+
+static void uprobe_buffer_disable(void)
+{
+	BUG_ON(!mutex_is_locked(&event_mutex));
+
+	if (--uprobe_buffer_refcnt == 0) {
+		free_percpu(uprobe_cpu_buffer);
+		uprobe_cpu_buffer = NULL;
+	}
+}
+
+static struct uprobe_cpu_buffer *uprobe_buffer_get(void)
+{
+	struct uprobe_cpu_buffer *ucb;
+	int cpu;
+
+	cpu = raw_smp_processor_id();
+	ucb = per_cpu_ptr(uprobe_cpu_buffer, cpu);
+
+	/*
+	 * Use per-cpu buffers for fastest access, but we might migrate
+	 * so the mutex makes sure we have sole access to it.
+	 */
+	mutex_lock(&ucb->mutex);
+
+	return ucb;
+}
+
+static void uprobe_buffer_put(struct uprobe_cpu_buffer *ucb)
+{
+	mutex_unlock(&ucb->mutex);
+}
+
 static void uprobe_trace_print(struct trace_uprobe *tu,
 				unsigned long func, struct pt_regs *regs)
 {
 	struct uprobe_trace_entry_head *entry;
 	struct ring_buffer_event *event;
 	struct ring_buffer *buffer;
+	struct uprobe_cpu_buffer *ucb;
 	void *data;
-	int size, i;
+	int size, dsize, esize;
 	struct ftrace_event_call *call = &tu->tp.call;
 
-	size = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
+	dsize = __get_data_size(&tu->tp, regs);
+	esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
+
+	if (WARN_ON_ONCE(!uprobe_cpu_buffer || tu->tp.size + dsize > PAGE_SIZE))
+		return;
+
+	ucb = uprobe_buffer_get();
+	store_trace_args(esize, &tu->tp, regs, ucb->buf, dsize);
+
+	size = esize + tu->tp.size + dsize;
 	event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
-						  size + tu->tp.size, 0, 0);
+						  size, 0, 0);
 	if (!event)
-		return;
+		goto out;
 
 	entry = ring_buffer_event_data(event);
 	if (is_ret_probe(tu)) {
@@ -678,13 +774,13 @@ static void uprobe_trace_print(struct trace_uprobe *tu,
 		data = DATAOF_TRACE_ENTRY(entry, false);
 	}
 
-	for (i = 0; i < tu->tp.nr_args; i++) {
-		call_fetch(&tu->tp.args[i].fetch, regs,
-			   data + tu->tp.args[i].offset);
-	}
+	memcpy(data, ucb->buf, tu->tp.size + dsize);
 
 	if (!call_filter_check_discard(call, entry, buffer, event))
 		trace_buffer_unlock_commit(buffer, event, 0, 0);
+
+out:
+	uprobe_buffer_put(ucb);
 }
 
 /* uprobe handler */
@@ -752,6 +848,10 @@ probe_event_enable(struct trace_uprobe *tu, int flag, filter_func_t filter)
 	if (trace_probe_is_enabled(&tu->tp))
 		return -EINTR;
 
+	ret = uprobe_buffer_enable();
+	if (ret < 0)
+		return ret;
+
 	WARN_ON(!uprobe_filter_is_empty(&tu->filter));
 
 	tu->tp.flags |= flag;
@@ -772,6 +872,8 @@ static void probe_event_disable(struct trace_uprobe *tu, int flag)
 
 	uprobe_unregister(tu->inode, tu->offset, &tu->consumer);
 	tu->tp.flags &= ~flag;
+
+	uprobe_buffer_disable();
 }
 
 static int uprobe_event_define_fields(struct ftrace_event_call *event_call)
@@ -898,11 +1000,24 @@ static void uprobe_perf_print(struct trace_uprobe *tu,
 	struct ftrace_event_call *call = &tu->tp.call;
 	struct uprobe_trace_entry_head *entry;
 	struct hlist_head *head;
+	struct uprobe_cpu_buffer *ucb;
 	void *data;
-	int size, rctx, i;
+	int size, dsize, esize;
+	int rctx;
+
+	dsize = __get_data_size(&tu->tp, regs);
+	esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
 
-	size = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
-	size = ALIGN(size + tu->tp.size + sizeof(u32), sizeof(u64)) - sizeof(u32);
+	if (WARN_ON_ONCE(!uprobe_cpu_buffer))
+		return;
+
+	size = esize + tu->tp.size + dsize;
+	size = ALIGN(size + sizeof(u32), sizeof(u64)) - sizeof(u32);
+	if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, "profile buffer not large enough"))
+		return;
+
+	ucb = uprobe_buffer_get();
+	store_trace_args(esize, &tu->tp, regs, ucb->buf, dsize);
 
 	preempt_disable();
 	head = this_cpu_ptr(call->perf_events);
@@ -922,15 +1037,18 @@ static void uprobe_perf_print(struct trace_uprobe *tu,
 		data = DATAOF_TRACE_ENTRY(entry, false);
 	}
 
-	for (i = 0; i < tu->tp.nr_args; i++) {
-		struct probe_arg *parg = &tu->tp.args[i];
+	memcpy(data, ucb->buf, tu->tp.size + dsize);
+
+	if (size - esize > tu->tp.size + dsize) {
+		int len = tu->tp.size + dsize;
 
-		call_fetch(&parg->fetch, regs, data + parg->offset);
+		memset(data + len, 0, size - esize - len);
 	}
 
 	perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL);
  out:
 	preempt_enable();
+	uprobe_buffer_put(ucb);
 }
 
 /* uprobe profile handler */
-- 
1.8.4.3

[for-next][PATCH 15/17] tracing/uprobes: Add support for full argument access methods

[Steven Rostedt]

[-- Attachment #1: 0015-tracing-uprobes-Add-support-for-full-argument-access.patch --]
[-- Type: text/plain, Size: 5474 bytes --]

From: Namhyung Kim <namhyung.kim@lge.com>

Enable to fetch other types of argument for the uprobes.  IOW, we can
access stack, memory, deref, bitfield and retval from uprobes now.

The format for the argument types are same as kprobes (but @SYMBOL
type is not supported for uprobes), i.e:

  @ADDR   : Fetch memory at ADDR
  $stackN : Fetch Nth entry of stack (N >= 0)
  $stack  : Fetch stack address
  $retval : Fetch return value
  +|-offs(FETCHARG) : Fetch memory at FETCHARG +|- offs address

Note that the retval only can be used with uretprobes.

Original-patch-by: Hyeoncheol Lee <cheol.lee@lge.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Hyeoncheol Lee <cheol.lee@lge.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 Documentation/trace/uprobetracer.txt | 25 +++++++++++++++++++++++++
 kernel/trace/trace_probe.c           | 34 ++++++++++++++++++++++------------
 2 files changed, 47 insertions(+), 12 deletions(-)

diff --git a/Documentation/trace/uprobetracer.txt b/Documentation/trace/uprobetracer.txt
index 8f1a8b89..6e5cff2 100644
--- a/Documentation/trace/uprobetracer.txt
+++ b/Documentation/trace/uprobetracer.txt
@@ -31,6 +31,31 @@ Synopsis of uprobe_tracer
 
   FETCHARGS     : Arguments. Each probe can have up to 128 args.
    %REG         : Fetch register REG
+   @ADDR	: Fetch memory at ADDR (ADDR should be in userspace)
+   $stackN	: Fetch Nth entry of stack (N >= 0)
+   $stack	: Fetch stack address.
+   $retval	: Fetch return value.(*)
+   +|-offs(FETCHARG) : Fetch memory at FETCHARG +|- offs address.(**)
+   NAME=FETCHARG     : Set NAME as the argument name of FETCHARG.
+   FETCHARG:TYPE     : Set TYPE as the type of FETCHARG. Currently, basic types
+		       (u8/u16/u32/u64/s8/s16/s32/s64), "string" and bitfield
+		       are supported.
+
+  (*) only for return probe.
+  (**) this is useful for fetching a field of data structures.
+
+Types
+-----
+Several types are supported for fetch-args. Uprobe tracer will access memory
+by given type. Prefix 's' and 'u' means those types are signed and unsigned
+respectively. Traced arguments are shown in decimal (signed) or hex (unsigned).
+String type is a special type, which fetches a "null-terminated" string from
+user space.
+Bitfield is another special type, which takes 3 parameters, bit-width, bit-
+offset, and container-size (usually 32). The syntax is;
+
+ b<bit-width>@<bit-offset>/<container-size>
+
 
 Event Profiling
 ---------------
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 8f7a2b6d..a130d61 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -255,12 +255,18 @@ fail:
 }
 
 /* Special function : only accept unsigned long */
-static __kprobes void fetch_stack_address(struct pt_regs *regs,
-					void *dummy, void *dest)
+static __kprobes void fetch_kernel_stack_address(struct pt_regs *regs,
+						 void *dummy, void *dest)
 {
 	*(unsigned long *)dest = kernel_stack_pointer(regs);
 }
 
+static __kprobes void fetch_user_stack_address(struct pt_regs *regs,
+					       void *dummy, void *dest)
+{
+	*(unsigned long *)dest = user_stack_pointer(regs);
+}
+
 static fetch_func_t get_fetch_size_function(const struct fetch_type *type,
 					    fetch_func_t orig_fn,
 					    const struct fetch_type *ftbl)
@@ -305,7 +311,8 @@ int traceprobe_split_symbol_offset(char *symbol, unsigned long *offset)
 #define PARAM_MAX_STACK (THREAD_SIZE / sizeof(unsigned long))
 
 static int parse_probe_vars(char *arg, const struct fetch_type *t,
-			    struct fetch_param *f, bool is_return)
+			    struct fetch_param *f, bool is_return,
+			    bool is_kprobe)
 {
 	int ret = 0;
 	unsigned long param;
@@ -317,13 +324,16 @@ static int parse_probe_vars(char *arg, const struct fetch_type *t,
 			ret = -EINVAL;
 	} else if (strncmp(arg, "stack", 5) == 0) {
 		if (arg[5] == '\0') {
-			if (strcmp(t->name, DEFAULT_FETCH_TYPE_STR) == 0)
-				f->fn = fetch_stack_address;
+			if (strcmp(t->name, DEFAULT_FETCH_TYPE_STR))
+				return -EINVAL;
+
+			if (is_kprobe)
+				f->fn = fetch_kernel_stack_address;
 			else
-				ret = -EINVAL;
+				f->fn = fetch_user_stack_address;
 		} else if (isdigit(arg[5])) {
 			ret = kstrtoul(arg + 5, 10, &param);
-			if (ret || param > PARAM_MAX_STACK)
+			if (ret || (is_kprobe && param > PARAM_MAX_STACK))
 				ret = -EINVAL;
 			else {
 				f->fn = t->fetch[FETCH_MTD_stack];
@@ -350,13 +360,9 @@ static int parse_probe_arg(char *arg, const struct fetch_type *t,
 	ftbl = is_kprobe ? kprobes_fetch_type_table : uprobes_fetch_type_table;
 	BUG_ON(ftbl == NULL);
 
-	/* Until uprobe_events supports only reg arguments */
-	if (!is_kprobe && arg[0] != '%')
-		return -EINVAL;
-
 	switch (arg[0]) {
 	case '$':
-		ret = parse_probe_vars(arg + 1, t, f, is_return);
+		ret = parse_probe_vars(arg + 1, t, f, is_return, is_kprobe);
 		break;
 
 	case '%':	/* named register */
@@ -377,6 +383,10 @@ static int parse_probe_arg(char *arg, const struct fetch_type *t,
 			f->fn = t->fetch[FETCH_MTD_memory];
 			f->data = (void *)param;
 		} else {
+			/* uprobes don't support symbols */
+			if (!is_kprobe)
+				return -EINVAL;
+
 			ret = traceprobe_split_symbol_offset(arg + 1, &offset);
 			if (ret)
 				break;
-- 
1.8.4.3

[for-next][PATCH 16/17] uprobes: Allocate ->utask before handler_chain() for tracing handlers

[Steven Rostedt]

[-- Attachment #1: 0016-uprobes-Allocate-utask-before-handler_chain-for-trac.patch --]
[-- Type: text/plain, Size: 1241 bytes --]

From: Oleg Nesterov <oleg@redhat.com>

uprobe_trace_print() and uprobe_perf_print() need to pass the additional
info to call_fetch() methods, currently there is no simple way to do this.

current->utask looks like a natural place to hold this info, but we need
to allocate it before handler_chain().

This is a bit unfortunate, perhaps we will find a better solution later,
but this is simple and should work right now.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 kernel/events/uprobes.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 24b7d6c..3cc8e0b 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -1828,6 +1828,10 @@ static void handle_swbp(struct pt_regs *regs)
 	if (unlikely(!test_bit(UPROBE_COPY_INSN, &uprobe->flags)))
 		goto out;
 
+	/* Tracing handlers use ->utask to communicate with fetch methods */
+	if (!get_utask())
+		goto out;
+
 	handler_chain(uprobe, regs);
 	if (can_skip_sstep(uprobe, regs))
 		goto out;
-- 
1.8.4.3

[for-next][PATCH 17/17] tracing/uprobes: Add @+file_offset fetch method

[Steven Rostedt]

[-- Attachment #1: 0017-tracing-uprobes-Add-file_offset-fetch-method.patch --]
[-- Type: text/plain, Size: 6326 bytes --]

From: Namhyung Kim <namhyung.kim@lge.com>

Enable to fetch data from a file offset.  Currently it only supports
fetching from same binary uprobe set.  It'll translate the file offset
to a proper virtual address in the process.

The syntax is "@+OFFSET" as it does similar to normal memory fetching
(@ADDR) which does no address translation.

Suggested-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 Documentation/trace/uprobetracer.txt |  1 +
 kernel/trace/trace_kprobe.c          |  8 ++++++++
 kernel/trace/trace_probe.c           | 13 +++++++++++-
 kernel/trace/trace_probe.h           |  2 ++
 kernel/trace/trace_uprobe.c          | 40 ++++++++++++++++++++++++++++++++++++
 5 files changed, 63 insertions(+), 1 deletion(-)

diff --git a/Documentation/trace/uprobetracer.txt b/Documentation/trace/uprobetracer.txt
index 6e5cff2..f1cf9a3 100644
--- a/Documentation/trace/uprobetracer.txt
+++ b/Documentation/trace/uprobetracer.txt
@@ -32,6 +32,7 @@ Synopsis of uprobe_tracer
   FETCHARGS     : Arguments. Each probe can have up to 128 args.
    %REG         : Fetch register REG
    @ADDR	: Fetch memory at ADDR (ADDR should be in userspace)
+   @+OFFSET	: Fetch memory at OFFSET (OFFSET from same file as PATH)
    $stackN	: Fetch Nth entry of stack (N >= 0)
    $stack	: Fetch stack address.
    $retval	: Fetch return value.(*)
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index f94a569..ce0ed8a 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -239,6 +239,14 @@ DEFINE_BASIC_FETCH_FUNCS(symbol)
 DEFINE_FETCH_symbol(string)
 DEFINE_FETCH_symbol(string_size)
 
+/* kprobes don't support file_offset fetch methods */
+#define fetch_file_offset_u8		NULL
+#define fetch_file_offset_u16		NULL
+#define fetch_file_offset_u32		NULL
+#define fetch_file_offset_u64		NULL
+#define fetch_file_offset_string	NULL
+#define fetch_file_offset_string_size	NULL
+
 /* Fetch type information table */
 const struct fetch_type kprobes_fetch_type_table[] = {
 	/* Special types */
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index a130d61..8364a42 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -374,7 +374,7 @@ static int parse_probe_arg(char *arg, const struct fetch_type *t,
 		}
 		break;
 
-	case '@':	/* memory or symbol */
+	case '@':	/* memory, file-offset or symbol */
 		if (isdigit(arg[1])) {
 			ret = kstrtoul(arg + 1, 0, &param);
 			if (ret)
@@ -382,6 +382,17 @@ static int parse_probe_arg(char *arg, const struct fetch_type *t,
 
 			f->fn = t->fetch[FETCH_MTD_memory];
 			f->data = (void *)param;
+		} else if (arg[1] == '+') {
+			/* kprobes don't support file offsets */
+			if (is_kprobe)
+				return -EINVAL;
+
+			ret = kstrtol(arg + 2, 0, &offset);
+			if (ret)
+				break;
+
+			f->fn = t->fetch[FETCH_MTD_file_offset];
+			f->data = (void *)offset;
 		} else {
 			/* uprobes don't support symbols */
 			if (!is_kprobe)
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index 2d5b8f5..e29d743 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -106,6 +106,7 @@ enum {
 	FETCH_MTD_symbol,
 	FETCH_MTD_deref,
 	FETCH_MTD_bitfield,
+	FETCH_MTD_file_offset,
 	FETCH_MTD_END,
 };
 
@@ -217,6 +218,7 @@ ASSIGN_FETCH_FUNC(memory, ftype),			\
 ASSIGN_FETCH_FUNC(symbol, ftype),			\
 ASSIGN_FETCH_FUNC(deref, ftype),			\
 ASSIGN_FETCH_FUNC(bitfield, ftype),			\
+ASSIGN_FETCH_FUNC(file_offset, ftype),			\
 	  }						\
 	}
 
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 794e8bc..1fdea6d 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -70,6 +70,11 @@ static int unregister_uprobe_event(struct trace_uprobe *tu);
 static DEFINE_MUTEX(uprobe_lock);
 static LIST_HEAD(uprobe_list);
 
+struct uprobe_dispatch_data {
+	struct trace_uprobe	*tu;
+	unsigned long		bp_addr;
+};
+
 static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs);
 static int uretprobe_dispatcher(struct uprobe_consumer *con,
 				unsigned long func, struct pt_regs *regs);
@@ -175,6 +180,29 @@ static __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
 #define fetch_symbol_string		NULL
 #define fetch_symbol_string_size	NULL
 
+static unsigned long translate_user_vaddr(void *file_offset)
+{
+	unsigned long base_addr;
+	struct uprobe_dispatch_data *udd;
+
+	udd = (void *) current->utask->vaddr;
+
+	base_addr = udd->bp_addr - udd->tu->offset;
+	return base_addr + (unsigned long)file_offset;
+}
+
+#define DEFINE_FETCH_file_offset(type)					\
+static __kprobes void FETCH_FUNC_NAME(file_offset, type)(struct pt_regs *regs,\
+					void *offset, void *dest) 	\
+{									\
+	void *vaddr = (void *)translate_user_vaddr(offset);		\
+									\
+	FETCH_FUNC_NAME(memory, type)(regs, vaddr, dest);		\
+}
+DEFINE_BASIC_FETCH_FUNCS(file_offset)
+DEFINE_FETCH_file_offset(string)
+DEFINE_FETCH_file_offset(string_size)
+
 /* Fetch type information table */
 const struct fetch_type uprobes_fetch_type_table[] = {
 	/* Special types */
@@ -1106,11 +1134,17 @@ int trace_uprobe_register(struct ftrace_event_call *event, enum trace_reg type,
 static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs)
 {
 	struct trace_uprobe *tu;
+	struct uprobe_dispatch_data udd;
 	int ret = 0;
 
 	tu = container_of(con, struct trace_uprobe, consumer);
 	tu->nhit++;
 
+	udd.tu = tu;
+	udd.bp_addr = instruction_pointer(regs);
+
+	current->utask->vaddr = (unsigned long) &udd;
+
 	if (tu->tp.flags & TP_FLAG_TRACE)
 		ret |= uprobe_trace_func(tu, regs);
 
@@ -1125,9 +1159,15 @@ static int uretprobe_dispatcher(struct uprobe_consumer *con,
 				unsigned long func, struct pt_regs *regs)
 {
 	struct trace_uprobe *tu;
+	struct uprobe_dispatch_data udd;
 
 	tu = container_of(con, struct trace_uprobe, consumer);
 
+	udd.tu = tu;
+	udd.bp_addr = func;
+
+	current->utask->vaddr = (unsigned long) &udd;
+
 	if (tu->tp.flags & TP_FLAG_TRACE)
 		uretprobe_trace_func(tu, func, regs);
 
-- 
1.8.4.3