[for-next][PATCH 00/17] tracing: Updates for 4.10

[for-next][PATCH 00/17] tracing: Updates for 4.10

[Steven Rostedt]

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

Head SHA1: 7d436400223bb46e9f88e6bba6f8d867acf0d82c


Chunyan Zhang (6):
      tracing: Add hook to function tracing for other subsystems to use
      stm class: ftrace: Add ftrace-export-over-stm driver
      coresight: Mark stm_generic_packet() with notrace
      intel_th: Mark sth_stm_packet() with notrace
      stm dummy: Mark dummy_stm_packet() with notrace
      stm: Mark the functions of writing STM with notrace

Masami Hiramatsu (8):
      selftests: ftrace: Initialize ftrace before each test
      selftests: ftrace: Add --quiet option not to show error logs on screen
      selftests: ftrace: Check whether snapshot trigger is supported correctly
      selftests: ftrace: Fix trigger-mod to run without syscall trace
      selftests: ftrace: Hide ftracetest logs from git
      selftests: ftrace: Introduce TMPDIR for temporary files
      selftests: ftrace: Add a testcase for function filter glob match
      selftests: ftrace: Add a testcase for types of kprobe event

Stephen Boyd (1):
      recordmcount: arm: Implement make_nop

Steven Rostedt (1):
      tracing: Add new trace_marker_raw

Steven Rostedt (Red Hat) (1):
      tracing: Add error checks to creation of event files

----
 Documentation/trace/ftrace.txt                     |   6 +
 drivers/hwtracing/coresight/coresight-stm.c        |   2 +-
 drivers/hwtracing/intel_th/sth.c                   |  11 +-
 drivers/hwtracing/stm/Kconfig                      |  11 +
 drivers/hwtracing/stm/Makefile                     |   2 +
 drivers/hwtracing/stm/core.c                       |   7 +-
 drivers/hwtracing/stm/dummy_stm.c                  |   2 +-
 drivers/hwtracing/stm/ftrace.c                     |  87 ++++++
 include/linux/stm.h                                |   4 +-
 include/linux/trace.h                              |  28 ++
 kernel/trace/trace.c                               | 294 ++++++++++++++++++---
 kernel/trace/trace.h                               |   2 +
 kernel/trace/trace_entries.h                       |  15 ++
 kernel/trace/trace_events.c                        |  30 ++-
 kernel/trace/trace_output.c                        |  30 +++
 scripts/recordmcount.c                             |  65 +++++
 tools/testing/selftests/ftrace/.gitignore          |   1 +
 tools/testing/selftests/ftrace/ftracetest          |  12 +-
 .../ftrace/test.d/ftrace/func-filter-glob.tc       |  49 ++++
 tools/testing/selftests/ftrace/test.d/functions    |  28 ++
 .../ftrace/test.d/kprobe/kprobe_args_type.tc       |  37 +++
 .../ftrace/test.d/trigger/trigger-hist-mod.tc      |   2 +-
 .../ftrace/test.d/trigger/trigger-snapshot.tc      |   5 +
 23 files changed, 675 insertions(+), 55 deletions(-)
 create mode 100644 drivers/hwtracing/stm/ftrace.c
 create mode 100644 include/linux/trace.h
 create mode 100644 tools/testing/selftests/ftrace/.gitignore
 create mode 100644 tools/testing/selftests/ftrace/test.d/ftrace/func-filter-glob.tc
 create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc

[for-next][PATCH 01/17] recordmcount: arm: Implement make_nop

[Steven Rostedt]

[-- Attachment #1: 0001-recordmcount-arm-Implement-make_nop.patch --]
[-- Type: text/plain, Size: 3670 bytes --]

From: Stephen Boyd <sboyd@codeaurora.org>

In similar spirit to x86 and arm64 support, add a make_nop_arm()
to replace calls to mcount with a nop in sections that aren't
traced.

Link: http://lkml.kernel.org/r/20161018234200.5804-1-sboyd@codeaurora.org

Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
Acked-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 scripts/recordmcount.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)

diff --git a/scripts/recordmcount.c b/scripts/recordmcount.c
index 5423a58d1b06..aeb34223167c 100644
--- a/scripts/recordmcount.c
+++ b/scripts/recordmcount.c
@@ -213,6 +213,59 @@ static int make_nop_x86(void *map, size_t const offset)
 	return 0;
 }
 
+static unsigned char ideal_nop4_arm_le[4] = { 0x00, 0x00, 0xa0, 0xe1 }; /* mov r0, r0 */
+static unsigned char ideal_nop4_arm_be[4] = { 0xe1, 0xa0, 0x00, 0x00 }; /* mov r0, r0 */
+static unsigned char *ideal_nop4_arm;
+
+static unsigned char bl_mcount_arm_le[4] = { 0xfe, 0xff, 0xff, 0xeb }; /* bl */
+static unsigned char bl_mcount_arm_be[4] = { 0xeb, 0xff, 0xff, 0xfe }; /* bl */
+static unsigned char *bl_mcount_arm;
+
+static unsigned char push_arm_le[4] = { 0x04, 0xe0, 0x2d, 0xe5 }; /* push {lr} */
+static unsigned char push_arm_be[4] = { 0xe5, 0x2d, 0xe0, 0x04 }; /* push {lr} */
+static unsigned char *push_arm;
+
+static unsigned char ideal_nop2_thumb_le[2] = { 0x00, 0xbf }; /* nop */
+static unsigned char ideal_nop2_thumb_be[2] = { 0xbf, 0x00 }; /* nop */
+static unsigned char *ideal_nop2_thumb;
+
+static unsigned char push_bl_mcount_thumb_le[6] = { 0x00, 0xb5, 0xff, 0xf7, 0xfe, 0xff }; /* push {lr}, bl */
+static unsigned char push_bl_mcount_thumb_be[6] = { 0xb5, 0x00, 0xf7, 0xff, 0xff, 0xfe }; /* push {lr}, bl */
+static unsigned char *push_bl_mcount_thumb;
+
+static int make_nop_arm(void *map, size_t const offset)
+{
+	char *ptr;
+	int cnt = 1;
+	int nop_size;
+	size_t off = offset;
+
+	ptr = map + offset;
+	if (memcmp(ptr, bl_mcount_arm, 4) == 0) {
+		if (memcmp(ptr - 4, push_arm, 4) == 0) {
+			off -= 4;
+			cnt = 2;
+		}
+		ideal_nop = ideal_nop4_arm;
+		nop_size = 4;
+	} else if (memcmp(ptr - 2, push_bl_mcount_thumb, 6) == 0) {
+		cnt = 3;
+		nop_size = 2;
+		off -= 2;
+		ideal_nop = ideal_nop2_thumb;
+	} else
+		return -1;
+
+	/* Convert to nop */
+	ulseek(fd_map, off, SEEK_SET);
+
+	do {
+		uwrite(fd_map, ideal_nop, nop_size);
+	} while (--cnt > 0);
+
+	return 0;
+}
+
 static unsigned char ideal_nop4_arm64[4] = {0x1f, 0x20, 0x03, 0xd5};
 static int make_nop_arm64(void *map, size_t const offset)
 {
@@ -430,6 +483,11 @@ do_file(char const *const fname)
 			w2 = w2rev;
 			w8 = w8rev;
 		}
+		ideal_nop4_arm = ideal_nop4_arm_le;
+		bl_mcount_arm = bl_mcount_arm_le;
+		push_arm = push_arm_le;
+		ideal_nop2_thumb = ideal_nop2_thumb_le;
+		push_bl_mcount_thumb = push_bl_mcount_thumb_le;
 		break;
 	case ELFDATA2MSB:
 		if (*(unsigned char const *)&endian != 0) {
@@ -438,6 +496,11 @@ do_file(char const *const fname)
 			w2 = w2rev;
 			w8 = w8rev;
 		}
+		ideal_nop4_arm = ideal_nop4_arm_be;
+		bl_mcount_arm = bl_mcount_arm_be;
+		push_arm = push_arm_be;
+		ideal_nop2_thumb = ideal_nop2_thumb_be;
+		push_bl_mcount_thumb = push_bl_mcount_thumb_be;
 		break;
 	}  /* end switch */
 	if (memcmp(ELFMAG, ehdr->e_ident, SELFMAG) != 0
@@ -463,6 +526,8 @@ do_file(char const *const fname)
 		break;
 	case EM_ARM:	 reltype = R_ARM_ABS32;
 			 altmcount = "__gnu_mcount_nc";
+			 make_nop = make_nop_arm;
+			 rel_type_nop = R_ARM_NONE;
 			 break;
 	case EM_AARCH64:
 			reltype = R_AARCH64_ABS64;
-- 
2.10.2

[for-next][PATCH 02/17] tracing: Add new trace_marker_raw

[Steven Rostedt]

[-- Attachment #1: 0002-tracing-Add-new-trace_marker_raw.patch --]
[-- Type: text/plain, Size: 10101 bytes --]

From: Steven Rostedt <rostedt@goodmis.org>

A new file is created:

 /sys/kernel/debug/tracing/trace_marker_raw

This allows for appications to create data structures and write the binary
data directly into it, and then read the trace data out from trace_pipe_raw
into the same type of data structure. This saves on converting numbers into
ASCII that would be required by trace_marker.

Suggested-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 Documentation/trace/ftrace.txt |   6 ++
 kernel/trace/trace.c           | 165 +++++++++++++++++++++++++++++++++--------
 kernel/trace/trace.h           |   2 +
 kernel/trace/trace_entries.h   |  15 ++++
 kernel/trace/trace_output.c    |  30 ++++++++
 5 files changed, 187 insertions(+), 31 deletions(-)

diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt
index 1bc66c1db0cb..6c374c5fe400 100644
--- a/Documentation/trace/ftrace.txt
+++ b/Documentation/trace/ftrace.txt
@@ -396,6 +396,12 @@ of ftrace. Here is a list of some of the key files:
 
 		trace_fd = open("trace_marker", WR_ONLY);
 
+  trace_marker_raw:
+
+	This is similar to trace_marker above, but is meant for for binary data
+	to be written to it, where a tool can be used to parse the data
+	from trace_pipe_raw.
+
   uprobe_events:
  
 	Add dynamic tracepoints in programs.
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index d904516dfdab..57069e7f369c 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4054,6 +4054,7 @@ static const char readme_msg[] =
 	"     x86-tsc:   TSC cycle counter\n"
 #endif
 	"\n  trace_marker\t\t- Writes into this file writes into the kernel buffer\n"
+	"\n  trace_marker_raw\t\t- Writes into this file writes binary data into the kernel buffer\n"
 	"  tracing_cpumask\t- Limit which CPUs to trace\n"
 	"  instances\t\t- Make sub-buffers with: mkdir instances/foo\n"
 	"\t\t\t  Remove sub-buffer with rmdir\n"
@@ -5514,35 +5515,15 @@ tracing_free_buffer_release(struct inode *inode, struct file *filp)
 	return 0;
 }
 
-static ssize_t
-tracing_mark_write(struct file *filp, const char __user *ubuf,
-					size_t cnt, loff_t *fpos)
+static inline int lock_user_pages(const char __user *ubuf, size_t cnt,
+				  struct page **pages, void **map_page,
+				  int *offset)
 {
 	unsigned long addr = (unsigned long)ubuf;
-	struct trace_array *tr = filp->private_data;
-	struct ring_buffer_event *event;
-	struct ring_buffer *buffer;
-	struct print_entry *entry;
-	unsigned long irq_flags;
-	struct page *pages[2];
-	void *map_page[2];
 	int nr_pages = 1;
-	ssize_t written;
-	int offset;
-	int size;
-	int len;
 	int ret;
 	int i;
 
-	if (tracing_disabled)
-		return -EINVAL;
-
-	if (!(tr->trace_flags & TRACE_ITER_MARKERS))
-		return -EINVAL;
-
-	if (cnt > TRACE_BUF_SIZE)
-		cnt = TRACE_BUF_SIZE;
-
 	/*
 	 * Userspace is injecting traces into the kernel trace buffer.
 	 * We want to be as non intrusive as possible.
@@ -5557,26 +5538,70 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
 	 * pages directly. We then write the data directly into the
 	 * ring buffer.
 	 */
-	BUILD_BUG_ON(TRACE_BUF_SIZE >= PAGE_SIZE);
 
 	/* check if we cross pages */
 	if ((addr & PAGE_MASK) != ((addr + cnt) & PAGE_MASK))
 		nr_pages = 2;
 
-	offset = addr & (PAGE_SIZE - 1);
+	*offset = addr & (PAGE_SIZE - 1);
 	addr &= PAGE_MASK;
 
 	ret = get_user_pages_fast(addr, nr_pages, 0, pages);
 	if (ret < nr_pages) {
 		while (--ret >= 0)
 			put_page(pages[ret]);
-		written = -EFAULT;
-		goto out;
+		return -EFAULT;
 	}
 
 	for (i = 0; i < nr_pages; i++)
 		map_page[i] = kmap_atomic(pages[i]);
 
+	return nr_pages;
+}
+
+static inline void unlock_user_pages(struct page **pages,
+				     void **map_page, int nr_pages)
+{
+	int i;
+
+	for (i = nr_pages - 1; i >= 0; i--) {
+		kunmap_atomic(map_page[i]);
+		put_page(pages[i]);
+	}
+}
+
+static ssize_t
+tracing_mark_write(struct file *filp, const char __user *ubuf,
+					size_t cnt, loff_t *fpos)
+{
+	struct trace_array *tr = filp->private_data;
+	struct ring_buffer_event *event;
+	struct ring_buffer *buffer;
+	struct print_entry *entry;
+	unsigned long irq_flags;
+	struct page *pages[2];
+	void *map_page[2];
+	int nr_pages = 1;
+	ssize_t written;
+	int offset;
+	int size;
+	int len;
+
+	if (tracing_disabled)
+		return -EINVAL;
+
+	if (!(tr->trace_flags & TRACE_ITER_MARKERS))
+		return -EINVAL;
+
+	if (cnt > TRACE_BUF_SIZE)
+		cnt = TRACE_BUF_SIZE;
+
+	BUILD_BUG_ON(TRACE_BUF_SIZE >= PAGE_SIZE);
+
+	nr_pages = lock_user_pages(ubuf, cnt, pages, map_page, &offset);
+	if (nr_pages < 0)
+		return nr_pages;
+
 	local_save_flags(irq_flags);
 	size = sizeof(*entry) + cnt + 2; /* possible \n added */
 	buffer = tr->trace_buffer.buffer;
@@ -5611,11 +5636,79 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
 	*fpos += written;
 
  out_unlock:
-	for (i = nr_pages - 1; i >= 0; i--) {
-		kunmap_atomic(map_page[i]);
-		put_page(pages[i]);
+	unlock_user_pages(pages, map_page, nr_pages);
+
+	return written;
+}
+
+/* Limit it for now to 3K (including tag) */
+#define RAW_DATA_MAX_SIZE (1024*3)
+
+static ssize_t
+tracing_mark_raw_write(struct file *filp, const char __user *ubuf,
+					size_t cnt, loff_t *fpos)
+{
+	struct trace_array *tr = filp->private_data;
+	struct ring_buffer_event *event;
+	struct ring_buffer *buffer;
+	struct raw_data_entry *entry;
+	unsigned long irq_flags;
+	struct page *pages[2];
+	void *map_page[2];
+	int nr_pages = 1;
+	ssize_t written;
+	int offset;
+	int size;
+	int len;
+
+	if (tracing_disabled)
+		return -EINVAL;
+
+	if (!(tr->trace_flags & TRACE_ITER_MARKERS))
+		return -EINVAL;
+
+	/* The marker must at least have a tag id */
+	if (cnt < sizeof(unsigned int) || cnt > RAW_DATA_MAX_SIZE)
+		return -EINVAL;
+
+	if (cnt > TRACE_BUF_SIZE)
+		cnt = TRACE_BUF_SIZE;
+
+	BUILD_BUG_ON(TRACE_BUF_SIZE >= PAGE_SIZE);
+
+	nr_pages = lock_user_pages(ubuf, cnt, pages, map_page, &offset);
+	if (nr_pages < 0)
+		return nr_pages;
+
+	local_save_flags(irq_flags);
+	size = sizeof(*entry) + cnt;
+	buffer = tr->trace_buffer.buffer;
+	event = trace_buffer_lock_reserve(buffer, TRACE_RAW_DATA, size,
+					  irq_flags, preempt_count());
+	if (!event) {
+		/* Ring buffer disabled, return as if not open for write */
+		written = -EBADF;
+		goto out_unlock;
 	}
- out:
+
+	entry = ring_buffer_event_data(event);
+
+	if (nr_pages == 2) {
+		len = PAGE_SIZE - offset;
+		memcpy(&entry->id, map_page[0] + offset, len);
+		memcpy(((char *)&entry->id) + len, map_page[1], cnt - len);
+	} else
+		memcpy(&entry->id, map_page[0] + offset, cnt);
+
+	__buffer_unlock_commit(buffer, event);
+
+	written = cnt;
+
+	*fpos += written;
+
+ out_unlock:
+	unlock_user_pages(pages, map_page, nr_pages);
+
 	return written;
 }
 
@@ -5945,6 +6038,13 @@ static const struct file_operations tracing_mark_fops = {
 	.release	= tracing_release_generic_tr,
 };
 
+static const struct file_operations tracing_mark_raw_fops = {
+	.open		= tracing_open_generic_tr,
+	.write		= tracing_mark_raw_write,
+	.llseek		= generic_file_llseek,
+	.release	= tracing_release_generic_tr,
+};
+
 static const struct file_operations trace_clock_fops = {
 	.open		= tracing_clock_open,
 	.read		= seq_read,
@@ -7214,6 +7314,9 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
 	trace_create_file("trace_marker", 0220, d_tracer,
 			  tr, &tracing_mark_fops);
 
+	trace_create_file("trace_marker_raw", 0220, d_tracer,
+			  tr, &tracing_mark_raw_fops);
+
 	trace_create_file("trace_clock", 0644, d_tracer, tr,
 			  &trace_clock_fops);
 
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 4b7918902ab8..9294f8606ade 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -40,6 +40,7 @@ enum trace_type {
 	TRACE_BLK,
 	TRACE_BPUTS,
 	TRACE_HWLAT,
+	TRACE_RAW_DATA,
 
 	__TRACE_LAST_TYPE,
 };
@@ -331,6 +332,7 @@ extern void __ftrace_bad_type(void);
 		IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT);	\
 		IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS);	\
 		IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT);	\
+		IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\
 		IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,		\
 			  TRACE_MMIO_RW);				\
 		IF_ASSIGN(var, ent, struct trace_mmiotrace_map,		\
diff --git a/kernel/trace/trace_entries.h b/kernel/trace/trace_entries.h
index d1cc37e78f99..eb7396b7e7c3 100644
--- a/kernel/trace/trace_entries.h
+++ b/kernel/trace/trace_entries.h
@@ -244,6 +244,21 @@ FTRACE_ENTRY(print, print_entry,
 	FILTER_OTHER
 );
 
+FTRACE_ENTRY(raw_data, raw_data_entry,
+
+	TRACE_RAW_DATA,
+
+	F_STRUCT(
+		__field(	unsigned int,	id	)
+		__dynamic_array(	char,	buf	)
+	),
+
+	F_printk("id:%04x %08x",
+		 __entry->id, (int)__entry->buf[0]),
+
+	FILTER_OTHER
+);
+
 FTRACE_ENTRY(bputs, bputs_entry,
 
 	TRACE_BPUTS,
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 3fc20422c166..5d33a7352919 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -1288,6 +1288,35 @@ static struct trace_event trace_print_event = {
 	.funcs		= &trace_print_funcs,
 };
 
+static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
+					 struct trace_event *event)
+{
+	struct raw_data_entry *field;
+	int i;
+
+	trace_assign_type(field, iter->ent);
+
+	trace_seq_printf(&iter->seq, "# %x buf:", field->id);
+
+	for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
+		trace_seq_printf(&iter->seq, " %02x",
+				 (unsigned char)field->buf[i]);
+
+	trace_seq_putc(&iter->seq, '\n');
+
+	return trace_handle_return(&iter->seq);
+}
+
+static struct trace_event_functions trace_raw_data_funcs = {
+	.trace		= trace_raw_data,
+	.raw		= trace_raw_data,
+};
+
+static struct trace_event trace_raw_data_event = {
+	.type	 	= TRACE_RAW_DATA,
+	.funcs		= &trace_raw_data_funcs,
+};
+
 
 static struct trace_event *events[] __initdata = {
 	&trace_fn_event,
@@ -1299,6 +1328,7 @@ static struct trace_event *events[] __initdata = {
 	&trace_bprint_event,
 	&trace_print_event,
 	&trace_hwlat_event,
+	&trace_raw_data_event,
 	NULL
 };
 
-- 
2.10.2

[for-next][PATCH 03/17] selftests: ftrace: Initialize ftrace before each test

[Steven Rostedt]

[-- Attachment #1: 0003-selftests-ftrace-Initialize-ftrace-before-each-test.patch --]
[-- Type: text/plain, Size: 2530 bytes --]

From: Masami Hiramatsu <mhiramat@kernel.org>

Reset ftrace to initial state before running each test.
This fixes some test cases to enable tracing before starting
trace test. This can avoid false-positive failure when
previous testcase fails while disabling tracing.

Link: http://lkml.kernel.org/r/147928398192.22982.7767460638302113002.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 tools/testing/selftests/ftrace/ftracetest       |  2 +-
 tools/testing/selftests/ftrace/test.d/functions | 28 +++++++++++++++++++++++++
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/ftrace/ftracetest b/tools/testing/selftests/ftrace/ftracetest
index 4c6a0bf8ba79..a03d366a4a2f 100755
--- a/tools/testing/selftests/ftrace/ftracetest
+++ b/tools/testing/selftests/ftrace/ftracetest
@@ -228,7 +228,7 @@ trap 'SIG_RESULT=$XFAIL' $SIG_XFAIL
 
 __run_test() { # testfile
   # setup PID and PPID, $$ is not updated.
-  (cd $TRACING_DIR; read PID _ < /proc/self/stat ; set -e; set -x; . $1)
+  (cd $TRACING_DIR; read PID _ < /proc/self/stat; set -e; set -x; initialize_ftrace; . $1)
   [ $? -ne 0 ] && kill -s $SIG_FAIL $SIG_PID
 }
 
diff --git a/tools/testing/selftests/ftrace/test.d/functions b/tools/testing/selftests/ftrace/test.d/functions
index c37262f6c269..91de1a8e4f19 100644
--- a/tools/testing/selftests/ftrace/test.d/functions
+++ b/tools/testing/selftests/ftrace/test.d/functions
@@ -23,3 +23,31 @@ reset_trigger() { # reset all current setting triggers
     done
 }
 
+reset_events_filter() { # reset all current setting filters
+    grep -v ^none events/*/*/filter |
+    while read line; do
+	echo 0 > `echo $line | cut -f1 -d:`
+    done
+}
+
+disable_events() {
+    echo 0 > events/enable
+}
+
+initialize_ftrace() { # Reset ftrace to initial-state
+# As the initial state, ftrace will be set to nop tracer,
+# no events, no triggers, no filters, no function filters,
+# no probes, and tracing on.
+    disable_tracing
+    reset_tracer
+    reset_trigger
+    reset_events_filter
+    disable_events
+    echo > set_event_pid	# event tracer is always on
+    [ -f set_ftrace_filter ] && echo | tee set_ftrace_*
+    [ -f set_graph_function ] && echo | tee set_graph_*
+    [ -f stack_trace_filter ] && echo > stack_trace_filter
+    [ -f kprobe_events ] && echo > kprobe_events
+    [ -f uprobe_events ] && echo > uprobe_events
+    enable_tracing
+}
-- 
2.10.2

[for-next][PATCH 04/17] selftests: ftrace: Add --quiet option not to show error logs on screen

[Steven Rostedt]

[-- Attachment #1: 0004-selftests-ftrace-Add-quiet-option-not-to-show-error-.patch --]
[-- Type: text/plain, Size: 3252 bytes --]

From: Masami Hiramatsu <mhiramat@kernel.org>

Since the verbose error logs scrolls out previous test results
--quiet option suppress to show such message.

e.g.
 # ./ftracetest -q
=== Ftrace unit tests ===
[1] Basic trace file check	[PASS]
[2] Basic test for tracers	[PASS]
[3] Basic trace clock test	[PASS]
[4] Basic event tracing check	[PASS]
[5] event tracing - enable/disable with event level files	[PASS]
[6] event tracing - restricts events based on pid	[PASS]
[7] event tracing - enable/disable with subsystem level files	[PASS]
[8] event tracing - enable/disable with top level files	[PASS]
[9] ftrace - function graph filters with stack tracer	[UNSUPPORTED]
[10] ftrace - function graph filters	[UNSUPPORTED]
[11] ftrace - function profiler with function tracing	[UNSUPPORTED]
[12] Test creation and deletion of trace instances while setting an event
	[PASS]
[13] Test creation and deletion of trace instances	[PASS]
[14] Kprobe dynamic event - adding and removing	[UNSUPPORTED]
[15] Kprobe dynamic event - busy event check	[UNSUPPORTED]
[16] Kprobe dynamic event with arguments	[UNSUPPORTED]
[17] Kprobe dynamic event with function tracer	[UNSUPPORTED]
[18] Kretprobe dynamic event with arguments	[UNSUPPORTED]
[19] event trigger - test event enable/disable trigger	[PASS]
[20] event trigger - test trigger filter	[PASS]
[21] event trigger - test histogram modifiers	[UNSUPPORTED]
[22] event trigger - test histogram trigger	[UNSUPPORTED]
[23] event trigger - test multiple histogram triggers	[UNSUPPORTED]
[24] event trigger - test snapshot-trigger	[FAIL]
[25] event trigger - test stacktrace-trigger	[PASS]
[26] event trigger - test traceon/off trigger	[PASS]

# of passed:  14
# of failed:  1
# of unresolved:  0
# of untested:  0
# of unsupported:  11
# of xfailed:  0
# of undefined(test bug):  0

Link: http://lkml.kernel.org/r/147928399712.22982.8284640390982775052.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 tools/testing/selftests/ftrace/ftracetest | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/ftrace/ftracetest b/tools/testing/selftests/ftrace/ftracetest
index a03d366a4a2f..d08235f65202 100755
--- a/tools/testing/selftests/ftrace/ftracetest
+++ b/tools/testing/selftests/ftrace/ftracetest
@@ -14,6 +14,7 @@ echo " Options:"
 echo "		-h|--help  Show help message"
 echo "		-k|--keep  Keep passed test logs"
 echo "		-v|--verbose Show all stdout messages in testcases"
+echo "		-q|--quiet Do not show error log on stdout"
 echo "		-d|--debug Debug mode (trace all shell commands)"
 exit $1
 }
@@ -58,6 +59,10 @@ parse_opts() { # opts
       VERBOSE=1
       shift 1
     ;;
+    --quiet|-q)
+      BE_QUIET=1
+      shift 1
+    ;;
     --debug|-d)
       DEBUG=1
       shift 1
@@ -101,6 +106,7 @@ LOG_DIR=$TOP_DIR/logs/`date +%Y%m%d-%H%M%S`/
 KEEP_LOG=0
 DEBUG=0
 VERBOSE=0
+BE_QUIET=0
 # Parse command-line options
 parse_opts $*
 
@@ -249,7 +255,7 @@ run_test() { # testfile
     # Remove test log if the test was done as it was expected.
     [ $KEEP_LOG -eq 0 ] && rm $testlog
   else
-    catlog $testlog
+    [ $BE_QUIET -eq 0 ] && catlog $testlog
     TOTAL_RESULT=1
   fi
 }
-- 
2.10.2

[for-next][PATCH 05/17] selftests: ftrace: Check whether snapshot trigger is supported correctly

[Steven Rostedt]

[-- Attachment #1: 0005-selftests-ftrace-Check-whether-snapshot-trigger-is-s.patch --]
[-- Type: text/plain, Size: 1101 bytes --]

From: Masami Hiramatsu <mhiramat@kernel.org>

If "snapshot" special file doesn't exist, that kernel does
not support snapshot and snapshot trigger too. In that case
snapshot trigger test results to unsupported instead of fail.

Link: http://lkml.kernel.org/r/147928401215.22982.10411665829041109794.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 tools/testing/selftests/ftrace/test.d/trigger/trigger-snapshot.tc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-snapshot.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-snapshot.tc
index f84b80d551a2..ed94f0c4e0e4 100644
--- a/tools/testing/selftests/ftrace/test.d/trigger/trigger-snapshot.tc
+++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-snapshot.tc
@@ -23,6 +23,11 @@ if [ ! -f events/sched/sched_process_fork/trigger ]; then
     exit_unsupported
 fi
 
+if [ ! -f snapshot ]; then
+    echo "snapshot is not supported"
+    exit_unsupported
+fi
+
 reset_tracer
 do_reset
 
-- 
2.10.2

[for-next][PATCH 06/17] selftests: ftrace: Fix trigger-mod to run without syscall trace

[Steven Rostedt]

[-- Attachment #1: 0006-selftests-ftrace-Fix-trigger-mod-to-run-without-sysc.patch --]
[-- Type: text/plain, Size: 1331 bytes --]

From: Masami Hiramatsu <mhiramat@kernel.org>

Since histogram trigger id.syscall depends on CONFIG_FTRACE_SYSCALLS,
a testcase in trigger-modifier test fails if that config is disabled.

Fix this bug by using flexible pattern to check the histogram output.

Link: http://lkml.kernel.org/r/147928402670.22982.15589445159052676877.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-mod.tc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-mod.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-mod.tc
index 0bf5085281f3..400e98b64948 100644
--- a/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-mod.tc
+++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-mod.tc
@@ -56,7 +56,7 @@ echo "Test histogram with syscall modifier"
 
 echo 'hist:keys=id.syscall' > events/raw_syscalls/sys_exit/trigger
 for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
-grep "id: sys_" events/raw_syscalls/sys_exit/hist > /dev/null || \
+grep "id: \(unknown_\|sys_\)" events/raw_syscalls/sys_exit/hist > /dev/null || \
     fail "syscall modifier on raw_syscalls/sys_exit did not work"
 
 
-- 
2.10.2

[for-next][PATCH 07/17] selftests: ftrace: Hide ftracetest logs from git

[Steven Rostedt]

[-- Attachment #1: 0007-selftests-ftrace-Hide-ftracetest-logs-from-git.patch --]
[-- Type: text/plain, Size: 679 bytes --]

From: Masami Hiramatsu <mhiramat@kernel.org>

Hide ftracetest result log directory from git.

Link: http://lkml.kernel.org/r/147928404640.22982.13173364949326289032.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 tools/testing/selftests/ftrace/.gitignore | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 tools/testing/selftests/ftrace/.gitignore

diff --git a/tools/testing/selftests/ftrace/.gitignore b/tools/testing/selftests/ftrace/.gitignore
new file mode 100644
index 000000000000..98d8a5a63049
--- /dev/null
+++ b/tools/testing/selftests/ftrace/.gitignore
@@ -0,0 +1 @@
+logs
-- 
2.10.2

[for-next][PATCH 08/17] selftests: ftrace: Introduce TMPDIR for temporary files

[Steven Rostedt]

[-- Attachment #1: 0008-selftests-ftrace-Introduce-TMPDIR-for-temporary-file.patch --]
[-- Type: text/plain, Size: 1152 bytes --]

From: Masami Hiramatsu <mhiramat@kernel.org>

Introduce TMPDIR variable which is removed after each test
is done, so that the test script can put their temporary
files in that.

Link: http://lkml.kernel.org/r/147928406116.22982.8761924340108532378.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 tools/testing/selftests/ftrace/ftracetest | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/testing/selftests/ftrace/ftracetest b/tools/testing/selftests/ftrace/ftracetest
index d08235f65202..685376b485a2 100755
--- a/tools/testing/selftests/ftrace/ftracetest
+++ b/tools/testing/selftests/ftrace/ftracetest
@@ -242,6 +242,7 @@ __run_test() { # testfile
 run_test() { # testfile
   local testname=`basename $1`
   local testlog=`mktemp $LOG_DIR/${testname}-log.XXXXXX`
+  export TMPDIR=`mktemp -d /tmp/ftracetest-dir.XXXXXX`
   testcase $1
   echo "execute: "$1 > $testlog
   SIG_RESULT=0
@@ -258,6 +259,7 @@ run_test() { # testfile
     [ $BE_QUIET -eq 0 ] && catlog $testlog
     TOTAL_RESULT=1
   fi
+  rm -rf $TMPDIR
 }
 
 # load in the helper functions
-- 
2.10.2

[for-next][PATCH 09/17] selftests: ftrace: Add a testcase for function filter glob match

[Steven Rostedt]

[-- Attachment #1: 0009-selftests-ftrace-Add-a-testcase-for-function-filter-.patch --]
[-- Type: text/plain, Size: 2537 bytes --]

From: Masami Hiramatsu <mhiramat@kernel.org>

Add function filter glob matching test case.
This checks whether the kernel supports glob matching
(front match, end match, middle match, side match,
character class and '?').

Here is the test result.
  -----
  ./ftracetest test.d/ftrace/func-filter-glob.tc
  === Ftrace unit tests ===
  [1] ftrace - function glob filters	[PASS]

  # of passed:  1
  # of failed:  0
  # of unresolved:  0
  # of untested:  0
  # of unsupported:  0
  # of xfailed:  0
  # of undefined(test bug):  0
  -----

Link: http://lkml.kernel.org/r/147928407589.22982.16364174511117104303.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 .../ftrace/test.d/ftrace/func-filter-glob.tc       | 49 ++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 tools/testing/selftests/ftrace/test.d/ftrace/func-filter-glob.tc

diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-glob.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-glob.tc
new file mode 100644
index 000000000000..9dcd0ca1f49c
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-glob.tc
@@ -0,0 +1,49 @@
+#!/bin/sh
+# description: ftrace - function glob filters
+
+# Make sure that function glob matching filter works.
+
+if ! grep -q function available_tracers; then
+    echo "no function tracer configured"
+    exit_unsupported
+fi
+
+disable_tracing
+clear_trace
+
+# filter by ?, schedule is always good
+if ! echo "sch?dule" > set_ftrace_filter; then
+    # test for powerpc 64
+    if ! echo ".sch?dule" > set_ftrace_filter; then
+	fail "can not enable schedule filter"
+    fi
+    cat set_ftrace_filter | grep '^.schedule$'
+else
+    cat set_ftrace_filter | grep '^schedule$'
+fi
+
+ftrace_filter_check() { # glob grep
+  echo "$1" > set_ftrace_filter
+  cut -f1 -d" " set_ftrace_filter > $TMPDIR/actual
+  cut -f1 -d" " available_filter_functions | grep "$2" > $TMPDIR/expected
+  DIFF=`diff $TMPDIR/actual $TMPDIR/expected`
+  test -z "$DIFF"
+}
+
+# filter by *, front match
+ftrace_filter_check '*schedule' '^.*schedule$'
+
+# filter by *, middle match
+ftrace_filter_check '*schedule*' '^.*schedule.*$'
+
+# filter by *, end match
+ftrace_filter_check 'schedule*' '^schedule.*$'
+
+# filter by *, both side match
+ftrace_filter_check 'sch*ule' '^sch.*ule$'
+
+# filter by char class.
+ftrace_filter_check '[Ss]y[Ss]_*' '^[Ss]y[Ss]_.*$'
+
+echo > set_ftrace_filter
+enable_tracing
-- 
2.10.2

[for-next][PATCH 10/17] selftests: ftrace: Add a testcase for types of kprobe event

[Steven Rostedt]

[-- Attachment #1: 0010-selftests-ftrace-Add-a-testcase-for-types-of-kprobe-.patch --]
[-- Type: text/plain, Size: 2235 bytes --]

From: Masami Hiramatsu <mhiramat@kernel.org>

Add a testcase for types of kprobe event. This checks
kprobe event can accept and correctly expressed the
arguments typed as s32, u32, x32 and bitfield.

Here is the test result.
  -----
  # ./ftracetest test.d/kprobe/kprobe_args_type.tc
  === Ftrace unit tests ===
  [1] Kprobes event arguments with types	[PASS]

  # of passed:  1
  # of failed:  0
  # of unresolved:  0
  # of untested:  0
  # of unsupported:  0
  # of xfailed:  0
  # of undefined(test bug):  0
  -----

Link: http://lkml.kernel.org/r/147928409063.22982.3499119203875115458.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 .../ftrace/test.d/kprobe/kprobe_args_type.tc       | 37 ++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc

diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
new file mode 100644
index 000000000000..0a78705b43b2
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
@@ -0,0 +1,37 @@
+#!/bin/sh
+# description: Kprobes event arguments with types
+
+[ -f kprobe_events ] || exit_unsupported # this is configurable
+
+grep "x8/16/32/64" README > /dev/null || exit_unsupported # version issue
+
+echo 0 > events/enable
+echo > kprobe_events
+enable_tracing
+
+echo 'p:testprobe _do_fork $stack0:s32 $stack0:u32 $stack0:x32 $stack0:b8@4/32' > kprobe_events
+grep testprobe kprobe_events
+test -d events/kprobes/testprobe
+
+echo 1 > events/kprobes/testprobe/enable
+( echo "forked")
+echo 0 > events/kprobes/testprobe/enable
+ARGS=`tail -n 1 trace | sed -e 's/.* arg1=\(.*\) arg2=\(.*\) arg3=\(.*\) arg4=\(.*\)/\1 \2 \3 \4/'`
+
+check_types() {
+  X1=`printf "%x" $1 | tail -c 8`
+  X2=`printf "%x" $2`
+  X3=`printf "%x" $3`
+  test $X1 = $X2
+  test $X2 = $X3
+  test 0x$X3 = $3
+
+  B4=`printf "%x" $4`
+  B3=`echo -n $X3 | tail -c 3 | head -c 2`
+  test $B3 = $B4
+}
+check_types $ARGS
+
+echo "-:testprobe" >> kprobe_events
+clear_trace
+test -d events/kprobes/testprobe && exit 1 || exit 0
-- 
2.10.2

[for-next][PATCH 11/17] tracing: Add hook to function tracing for other subsystems to use

[Steven Rostedt]

[-- Attachment #1: 0011-tracing-Add-hook-to-function-tracing-for-other-subsy.patch --]
[-- Type: text/plain, Size: 5810 bytes --]

From: Chunyan Zhang <zhang.chunyan@linaro.org>

Currently Function traces can be only exported to the ring buffer. This
adds a trace_export concept which can process traces and export
them to a registered destination as an addition to the current
one that outputs to Ftrace - i.e. ring buffer.

In this way, if we want function traces to be sent to other destinations
rather than only to the ring buffer, we just need to register a new
trace_export and implement its own .write() function for writing traces to
storage.

With this patch, only function tracing (trace type is TRACE_FN)
is supported.

Link: http://lkml.kernel.org/r/1479715043-6534-2-git-send-email-zhang.chunyan@linaro.org

Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 include/linux/trace.h |  28 +++++++++++
 kernel/trace/trace.c  | 129 +++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 156 insertions(+), 1 deletion(-)
 create mode 100644 include/linux/trace.h

diff --git a/include/linux/trace.h b/include/linux/trace.h
new file mode 100644
index 000000000000..9330a58e2651
--- /dev/null
+++ b/include/linux/trace.h
@@ -0,0 +1,28 @@
+#ifndef _LINUX_TRACE_H
+#define _LINUX_TRACE_H
+
+#ifdef CONFIG_TRACING
+/*
+ * The trace export - an export of Ftrace output. The trace_export
+ * can process traces and export them to a registered destination as
+ * an addition to the current only output of Ftrace - i.e. ring buffer.
+ *
+ * If you want traces to be sent to some other place rather than ring
+ * buffer only, just need to register a new trace_export and implement
+ * its own .write() function for writing traces to the storage.
+ *
+ * next		- pointer to the next trace_export
+ * write	- copy traces which have been delt with ->commit() to
+ *		  the destination
+ */
+struct trace_export {
+	struct trace_export __rcu	*next;
+	void (*write)(const void *, unsigned int);
+};
+
+int register_ftrace_export(struct trace_export *export);
+int unregister_ftrace_export(struct trace_export *export);
+
+#endif	/* CONFIG_TRACING */
+
+#endif	/* _LINUX_TRACE_H */
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 57069e7f369c..edccdff8a36d 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -40,6 +40,7 @@
 #include <linux/poll.h>
 #include <linux/nmi.h>
 #include <linux/fs.h>
+#include <linux/trace.h>
 #include <linux/sched/rt.h>
 
 #include "trace.h"
@@ -2128,6 +2129,129 @@ void trace_buffer_unlock_commit_regs(struct trace_array *tr,
 	ftrace_trace_userstack(buffer, flags, pc);
 }
 
+static void
+trace_process_export(struct trace_export *export,
+	       struct ring_buffer_event *event)
+{
+	struct trace_entry *entry;
+	unsigned int size = 0;
+
+	entry = ring_buffer_event_data(event);
+	size = ring_buffer_event_length(event);
+	export->write(entry, size);
+}
+
+static DEFINE_MUTEX(ftrace_export_lock);
+
+static struct trace_export __rcu *ftrace_exports_list __read_mostly;
+
+static DEFINE_STATIC_KEY_FALSE(ftrace_exports_enabled);
+
+static inline void ftrace_exports_enable(void)
+{
+	static_branch_enable(&ftrace_exports_enabled);
+}
+
+static inline void ftrace_exports_disable(void)
+{
+	static_branch_disable(&ftrace_exports_enabled);
+}
+
+void ftrace_exports(struct ring_buffer_event *event)
+{
+	struct trace_export *export;
+
+	preempt_disable_notrace();
+
+	export = rcu_dereference_raw_notrace(ftrace_exports_list);
+	while (export) {
+		trace_process_export(export, event);
+		export = rcu_dereference_raw_notrace(export->next);
+	}
+
+	preempt_enable_notrace();
+}
+
+static inline void
+add_trace_export(struct trace_export **list, struct trace_export *export)
+{
+	rcu_assign_pointer(export->next, *list);
+	/*
+	 * We are entering export into the list but another
+	 * CPU might be walking that list. We need to make sure
+	 * the export->next pointer is valid before another CPU sees
+	 * the export pointer included into the list.
+	 */
+	rcu_assign_pointer(*list, export);
+}
+
+static inline int
+rm_trace_export(struct trace_export **list, struct trace_export *export)
+{
+	struct trace_export **p;
+
+	for (p = list; *p != NULL; p = &(*p)->next)
+		if (*p == export)
+			break;
+
+	if (*p != export)
+		return -1;
+
+	rcu_assign_pointer(*p, (*p)->next);
+
+	return 0;
+}
+
+static inline void
+add_ftrace_export(struct trace_export **list, struct trace_export *export)
+{
+	if (*list == NULL)
+		ftrace_exports_enable();
+
+	add_trace_export(list, export);
+}
+
+static inline int
+rm_ftrace_export(struct trace_export **list, struct trace_export *export)
+{
+	int ret;
+
+	ret = rm_trace_export(list, export);
+	if (*list == NULL)
+		ftrace_exports_disable();
+
+	return ret;
+}
+
+int register_ftrace_export(struct trace_export *export)
+{
+	if (WARN_ON_ONCE(!export->write))
+		return -1;
+
+	mutex_lock(&ftrace_export_lock);
+
+	add_ftrace_export(&ftrace_exports_list, export);
+
+	mutex_unlock(&ftrace_export_lock);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(register_ftrace_export);
+
+int unregister_ftrace_export(struct trace_export *export)
+{
+	int ret;
+
+	mutex_lock(&ftrace_export_lock);
+
+	ret = rm_ftrace_export(&ftrace_exports_list, export);
+
+	mutex_unlock(&ftrace_export_lock);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(unregister_ftrace_export);
+
 void
 trace_function(struct trace_array *tr,
 	       unsigned long ip, unsigned long parent_ip, unsigned long flags,
@@ -2146,8 +2270,11 @@ trace_function(struct trace_array *tr,
 	entry->ip			= ip;
 	entry->parent_ip		= parent_ip;
 
-	if (!call_filter_check_discard(call, entry, buffer, event))
+	if (!call_filter_check_discard(call, entry, buffer, event)) {
+		if (static_branch_unlikely(&ftrace_exports_enabled))
+			ftrace_exports(event);
 		__buffer_unlock_commit(buffer, event);
+	}
 }
 
 #ifdef CONFIG_STACKTRACE
-- 
2.10.2

[for-next][PATCH 12/17] stm class: ftrace: Add ftrace-export-over-stm driver

[Steven Rostedt]

[-- Attachment #1: 0012-stm-class-ftrace-Add-ftrace-export-over-stm-driver.patch --]
[-- Type: text/plain, Size: 4586 bytes --]

From: Chunyan Zhang <zhang.chunyan@linaro.org>

This patch adds a driver that models itself as an stm_source called
stm_ftrace. Once the stm device and stm_ftrace have been linked via
sysfs, the driver registers itself as a trace_export and everything
passed to the interface from Ftrace subsystem will end up in the STM
trace engine.

Link: http://lkml.kernel.org/r/1479715043-6534-3-git-send-email-zhang.chunyan@linaro.org

Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 drivers/hwtracing/stm/Kconfig  | 11 ++++++
 drivers/hwtracing/stm/Makefile |  2 +
 drivers/hwtracing/stm/ftrace.c | 87 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 100 insertions(+)
 create mode 100644 drivers/hwtracing/stm/ftrace.c

diff --git a/drivers/hwtracing/stm/Kconfig b/drivers/hwtracing/stm/Kconfig
index 847a39b35307..723e2d90083d 100644
--- a/drivers/hwtracing/stm/Kconfig
+++ b/drivers/hwtracing/stm/Kconfig
@@ -39,4 +39,15 @@ config STM_SOURCE_HEARTBEAT
 	  If you want to send heartbeat messages over STM devices,
 	  say Y.
 
+config STM_SOURCE_FTRACE
+	tristate "Copy the output from kernel Ftrace to STM engine"
+	depends on FUNCTION_TRACER
+	help
+	  This option can be used to copy the output from kernel Ftrace
+	  to STM engine. Enabling this option will introduce a slight
+	  timing effect.
+
+	  If you want to send kernel Ftrace messages over STM devices,
+	  say Y.
+
 endif
diff --git a/drivers/hwtracing/stm/Makefile b/drivers/hwtracing/stm/Makefile
index a9ce3d487e57..3abd84ce13d4 100644
--- a/drivers/hwtracing/stm/Makefile
+++ b/drivers/hwtracing/stm/Makefile
@@ -6,6 +6,8 @@ obj-$(CONFIG_STM_DUMMY)	+= dummy_stm.o
 
 obj-$(CONFIG_STM_SOURCE_CONSOLE)	+= stm_console.o
 obj-$(CONFIG_STM_SOURCE_HEARTBEAT)	+= stm_heartbeat.o
+obj-$(CONFIG_STM_SOURCE_FTRACE)		+= stm_ftrace.o
 
 stm_console-y		:= console.o
 stm_heartbeat-y		:= heartbeat.o
+stm_ftrace-y		:= ftrace.o
diff --git a/drivers/hwtracing/stm/ftrace.c b/drivers/hwtracing/stm/ftrace.c
new file mode 100644
index 000000000000..bd126a7c6da2
--- /dev/null
+++ b/drivers/hwtracing/stm/ftrace.c
@@ -0,0 +1,87 @@
+/*
+ * Simple kernel driver to link kernel Ftrace and an STM device
+ * Copyright (c) 2016, Linaro Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * STM Ftrace will be registered as a trace_export.
+ */
+
+#include <linux/module.h>
+#include <linux/stm.h>
+#include <linux/trace.h>
+
+#define STM_FTRACE_NR_CHANNELS 1
+#define STM_FTRACE_CHAN 0
+
+static int stm_ftrace_link(struct stm_source_data *data);
+static void stm_ftrace_unlink(struct stm_source_data *data);
+
+static struct stm_ftrace {
+	struct stm_source_data	data;
+	struct trace_export	ftrace;
+} stm_ftrace = {
+	.data	= {
+		.name		= "ftrace",
+		.nr_chans	= STM_FTRACE_NR_CHANNELS,
+		.link		= stm_ftrace_link,
+		.unlink		= stm_ftrace_unlink,
+	},
+};
+
+/**
+ * stm_ftrace_write() - write data to STM via 'stm_ftrace' source
+ * @buf:	buffer containing the data packet
+ * @len:	length of the data packet
+ */
+static void notrace
+stm_ftrace_write(const void *buf, unsigned int len)
+{
+	stm_source_write(&stm_ftrace.data, STM_FTRACE_CHAN, buf, len);
+}
+
+static int stm_ftrace_link(struct stm_source_data *data)
+{
+	struct stm_ftrace *sf = container_of(data, struct stm_ftrace, data);
+
+	sf->ftrace.write = stm_ftrace_write;
+
+	return register_ftrace_export(&sf->ftrace);
+}
+
+static void stm_ftrace_unlink(struct stm_source_data *data)
+{
+	struct stm_ftrace *sf = container_of(data, struct stm_ftrace, data);
+
+	unregister_ftrace_export(&sf->ftrace);
+}
+
+static int __init stm_ftrace_init(void)
+{
+	int ret;
+
+	ret = stm_source_register_device(NULL, &stm_ftrace.data);
+	if (ret)
+		pr_err("Failed to register stm_source - ftrace.\n");
+
+	return ret;
+}
+
+static void __exit stm_ftrace_exit(void)
+{
+	stm_source_unregister_device(&stm_ftrace.data);
+}
+
+module_init(stm_ftrace_init);
+module_exit(stm_ftrace_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("stm_ftrace driver");
+MODULE_AUTHOR("Chunyan Zhang <zhang.chunyan@linaro.org>");
-- 
2.10.2

[for-next][PATCH 13/17] coresight: Mark stm_generic_packet() with notrace

[Steven Rostedt]

[-- Attachment #1: 0013-coresight-Mark-stm_generic_packet-with-notrace.patch --]
[-- Type: text/plain, Size: 1254 bytes --]

From: Chunyan Zhang <zhang.chunyan@linaro.org>

If CONFIG_STM_SOURCE_FTRACE is selected, Function trace data can be
writen to sink via STM, all functions that related to writing data
packets to STM should be marked 'notrace' to avoid being traced by
Ftrace, otherwise the program would stall into an endless loop.

Link: http://lkml.kernel.org/r/1479715043-6534-4-git-send-email-zhang.chunyan@linaro.org

Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 drivers/hwtracing/coresight/coresight-stm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
index 49e0f1b925a5..b7543bd19c9e 100644
--- a/drivers/hwtracing/coresight/coresight-stm.c
+++ b/drivers/hwtracing/coresight/coresight-stm.c
@@ -406,7 +406,7 @@ static long stm_generic_set_options(struct stm_data *stm_data,
 	return 0;
 }
 
-static ssize_t stm_generic_packet(struct stm_data *stm_data,
+static ssize_t notrace stm_generic_packet(struct stm_data *stm_data,
 				  unsigned int master,
 				  unsigned int channel,
 				  unsigned int packet,
-- 
2.10.2

[for-next][PATCH 14/17] intel_th: Mark sth_stm_packet() with notrace

[Steven Rostedt]

[-- Attachment #1: 0014-intel_th-Mark-sth_stm_packet-with-notrace.patch --]
[-- Type: text/plain, Size: 1602 bytes --]

From: Chunyan Zhang <zhang.chunyan@linaro.org>

If CONFIG_STM_SOURCE_FTRACE is selected, Function trace data can be
writen to sink via STM, all functions that related to writing data
packets to STM should be marked 'notrace' to avoid being traced by
Ftrace, otherwise the program would stall into an endless loop.

Link: http://lkml.kernel.org/r/1479715043-6534-5-git-send-email-zhang.chunyan@linaro.org

Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 drivers/hwtracing/intel_th/sth.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/hwtracing/intel_th/sth.c b/drivers/hwtracing/intel_th/sth.c
index e1aee61dd7b3..b03444624648 100644
--- a/drivers/hwtracing/intel_th/sth.c
+++ b/drivers/hwtracing/intel_th/sth.c
@@ -67,10 +67,13 @@ static void sth_iowrite(void __iomem *dest, const unsigned char *payload,
 	}
 }
 
-static ssize_t sth_stm_packet(struct stm_data *stm_data, unsigned int master,
-			      unsigned int channel, unsigned int packet,
-			      unsigned int flags, unsigned int size,
-			      const unsigned char *payload)
+static ssize_t notrace sth_stm_packet(struct stm_data *stm_data,
+				      unsigned int master,
+				      unsigned int channel,
+				      unsigned int packet,
+				      unsigned int flags,
+				      unsigned int size,
+				      const unsigned char *payload)
 {
 	struct sth_device *sth = container_of(stm_data, struct sth_device, stm);
 	struct intel_th_channel __iomem *out =
-- 
2.10.2

[for-next][PATCH 15/17] stm dummy: Mark dummy_stm_packet() with notrace

[Steven Rostedt]

[-- Attachment #1: 0015-stm-dummy-Mark-dummy_stm_packet-with-notrace.patch --]
[-- Type: text/plain, Size: 1182 bytes --]

From: Chunyan Zhang <zhang.chunyan@linaro.org>

If CONFIG_STM_SOURCE_FTRACE is selected, Function trace data can be
writen to sink via STM, all functions that related to writing data
packets to STM should be marked 'notrace' to avoid being traced by
Ftrace, otherwise the program would stall into an endless loop.

Link: http://lkml.kernel.org/r/1479715043-6534-6-git-send-email-zhang.chunyan@linaro.org

Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 drivers/hwtracing/stm/dummy_stm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwtracing/stm/dummy_stm.c b/drivers/hwtracing/stm/dummy_stm.c
index a86612d989f9..c5f94ca31c4d 100644
--- a/drivers/hwtracing/stm/dummy_stm.c
+++ b/drivers/hwtracing/stm/dummy_stm.c
@@ -21,7 +21,7 @@
 #include <linux/slab.h>
 #include <linux/stm.h>
 
-static ssize_t
+static ssize_t notrace
 dummy_stm_packet(struct stm_data *stm_data, unsigned int master,
 		 unsigned int channel, unsigned int packet, unsigned int flags,
 		 unsigned int size, const unsigned char *payload)
-- 
2.10.2

[for-next][PATCH 16/17] stm: Mark the functions of writing STM with notrace

[Steven Rostedt]

[-- Attachment #1: 0016-stm-Mark-the-functions-of-writing-STM-with-notrace.patch --]
[-- Type: text/plain, Size: 2324 bytes --]

From: Chunyan Zhang <zhang.chunyan@linaro.org>

If CONFIG_STM_SOURCE_FTRACE is selected, Function trace data can be
writen to sink via STM, all functions that related to writing data
packets to STM should be marked 'notrace' to avoid being traced by
Ftrace, otherwise the program would stall into an endless loop.

Link: http://lkml.kernel.org/r/1479715043-6534-7-git-send-email-zhang.chunyan@linaro.org

Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 drivers/hwtracing/stm/core.c | 7 ++++---
 include/linux/stm.h          | 4 ++--
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c
index 51f81d64ca37..37d3bcbd2534 100644
--- a/drivers/hwtracing/stm/core.c
+++ b/drivers/hwtracing/stm/core.c
@@ -425,7 +425,7 @@ static int stm_file_assign(struct stm_file *stmf, char *id, unsigned int width)
 	return ret;
 }
 
-static ssize_t stm_write(struct stm_data *data, unsigned int master,
+static ssize_t notrace stm_write(struct stm_data *data, unsigned int master,
 			  unsigned int channel, const char *buf, size_t count)
 {
 	unsigned int flags = STP_PACKET_TIMESTAMPED;
@@ -1121,8 +1121,9 @@ void stm_source_unregister_device(struct stm_source_data *data)
 }
 EXPORT_SYMBOL_GPL(stm_source_unregister_device);
 
-int stm_source_write(struct stm_source_data *data, unsigned int chan,
-		     const char *buf, size_t count)
+int notrace stm_source_write(struct stm_source_data *data,
+			     unsigned int chan,
+			     const char *buf, size_t count)
 {
 	struct stm_source_device *src = data->src;
 	struct stm_device *stm;
diff --git a/include/linux/stm.h b/include/linux/stm.h
index 8369d8a8cabd..210ff2292361 100644
--- a/include/linux/stm.h
+++ b/include/linux/stm.h
@@ -133,7 +133,7 @@ int stm_source_register_device(struct device *parent,
 			       struct stm_source_data *data);
 void stm_source_unregister_device(struct stm_source_data *data);
 
-int stm_source_write(struct stm_source_data *data, unsigned int chan,
-		     const char *buf, size_t count);
+int notrace stm_source_write(struct stm_source_data *data, unsigned int chan,
+			     const char *buf, size_t count);
 
 #endif /* _STM_H_ */
-- 
2.10.2

[for-next][PATCH 17/17] tracing: Add error checks to creation of event files

[Steven Rostedt]

[-- Attachment #1: 0017-tracing-Add-error-checks-to-creation-of-event-files.patch --]
[-- Type: text/plain, Size: 2290 bytes --]

From: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>

The creation of the set_event_pid file was assigned to a variable "entry"
but that variable was never used. Ideally, it should be used to check if the
file was created and warn if it was not.

The files header_page, header_event should also be checked and a warning if
they fail to be created.

The "enable" file was moved up, as it is a more crucial file to have and a
hard failure (return -ENOMEM) should be returned if it is not created.

Reported-by: David Binderman <dcb314@hotmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 kernel/trace/trace_events.c | 30 +++++++++++++++++++++---------
 1 file changed, 21 insertions(+), 9 deletions(-)

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 03c0a48c3ac4..ba67ede48822 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -2843,20 +2843,32 @@ create_event_toplevel_files(struct dentry *parent, struct trace_array *tr)
 		return -ENOMEM;
 	}
 
+	entry = trace_create_file("enable", 0644, d_events,
+				  tr, &ftrace_tr_enable_fops);
+	if (!entry) {
+		pr_warn("Could not create tracefs 'enable' entry\n");
+		return -ENOMEM;
+	}
+
+	/* There are not as crucial, just warn if they are not created */
+
 	entry = tracefs_create_file("set_event_pid", 0644, parent,
 				    tr, &ftrace_set_event_pid_fops);
+	if (!entry)
+		pr_warn("Could not create tracefs 'set_event_pid' entry\n");
 
 	/* ring buffer internal formats */
-	trace_create_file("header_page", 0444, d_events,
-			  ring_buffer_print_page_header,
-			  &ftrace_show_header_fops);
-
-	trace_create_file("header_event", 0444, d_events,
-			  ring_buffer_print_entry_header,
-			  &ftrace_show_header_fops);
+	entry = trace_create_file("header_page", 0444, d_events,
+				  ring_buffer_print_page_header,
+				  &ftrace_show_header_fops);
+	if (!entry)
+		pr_warn("Could not create tracefs 'header_page' entry\n");
 
-	trace_create_file("enable", 0644, d_events,
-			  tr, &ftrace_tr_enable_fops);
+	entry = trace_create_file("header_event", 0444, d_events,
+				  ring_buffer_print_entry_header,
+				  &ftrace_show_header_fops);
+	if (!entry)
+		pr_warn("Could not create tracefs 'header_event' entry\n");
 
 	tr->event_dir = d_events;
 
-- 
2.10.2