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v4l: Export enums used by tracepoints to user space

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Enums used by tracepoints for __print_symbolic() are shown in the
tracepoint format files with just their names and not their values.
This makes it difficult for user space tools to know how to convert the
binary data into their string representations.

By adding the use of TRACE_DEFINE_ENUM(), the enum names will be mapped
to their values and shown in the tracing file system to let tools
convert the data as necessary.

Link: http://lkml.kernel.org/r/20150403013802.220157513@goodmis.org

Acked-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Tested-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2015-03-27 17:04:45 -04:00 committed by Steven Rostedt
parent 6ba16eefcd
commit 43d0f71f0e
1 changed files with 50 additions and 25 deletions
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75
include/trace/events/v4l2.h
View file

@ -6,33 +6,58 @@
#include <linux/tracepoint.h>
#define show_type(type) \
__print_symbolic(type, \
{ V4L2_BUF_TYPE_VIDEO_CAPTURE, "VIDEO_CAPTURE" }, \
{ V4L2_BUF_TYPE_VIDEO_OUTPUT, "VIDEO_OUTPUT" }, \
{ V4L2_BUF_TYPE_VIDEO_OVERLAY, "VIDEO_OVERLAY" }, \
{ V4L2_BUF_TYPE_VBI_CAPTURE, "VBI_CAPTURE" }, \
{ V4L2_BUF_TYPE_VBI_OUTPUT, "VBI_OUTPUT" }, \
{ V4L2_BUF_TYPE_SLICED_VBI_CAPTURE, "SLICED_VBI_CAPTURE" }, \
{ V4L2_BUF_TYPE_SLICED_VBI_OUTPUT, "SLICED_VBI_OUTPUT" }, \
{ V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY, "VIDEO_OUTPUT_OVERLAY" },\
{ V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE, "VIDEO_CAPTURE_MPLANE" },\
{ V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE, "VIDEO_OUTPUT_MPLANE" }, \
{ V4L2_BUF_TYPE_SDR_CAPTURE, "SDR_CAPTURE" }, \
{ V4L2_BUF_TYPE_PRIVATE, "PRIVATE" })
/* Enums require being exported to userspace, for user tool parsing */
#undef EM
#undef EMe
#define EM(a, b) TRACE_DEFINE_ENUM(a);
#define EMe(a, b) TRACE_DEFINE_ENUM(a);
#define show_type(type) \
__print_symbolic(type, SHOW_TYPE)
#define SHOW_TYPE \
EM( V4L2_BUF_TYPE_VIDEO_CAPTURE, "VIDEO_CAPTURE" ) \
EM( V4L2_BUF_TYPE_VIDEO_OUTPUT, "VIDEO_OUTPUT" ) \
EM( V4L2_BUF_TYPE_VIDEO_OVERLAY, "VIDEO_OVERLAY" ) \
EM( V4L2_BUF_TYPE_VBI_CAPTURE, "VBI_CAPTURE" ) \
EM( V4L2_BUF_TYPE_VBI_OUTPUT, "VBI_OUTPUT" ) \
EM( V4L2_BUF_TYPE_SLICED_VBI_CAPTURE, "SLICED_VBI_CAPTURE" ) \
EM( V4L2_BUF_TYPE_SLICED_VBI_OUTPUT, "SLICED_VBI_OUTPUT" ) \
EM( V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY, "VIDEO_OUTPUT_OVERLAY" ) \
EM( V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE, "VIDEO_CAPTURE_MPLANE" ) \
EM( V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE, "VIDEO_OUTPUT_MPLANE" ) \
EM( V4L2_BUF_TYPE_SDR_CAPTURE, "SDR_CAPTURE" ) \
EMe(V4L2_BUF_TYPE_PRIVATE, "PRIVATE" )
SHOW_TYPE
#define show_field(field) \
__print_symbolic(field, \
{ V4L2_FIELD_ANY, "ANY" }, \
{ V4L2_FIELD_NONE, "NONE" }, \
{ V4L2_FIELD_TOP, "TOP" }, \
{ V4L2_FIELD_BOTTOM, "BOTTOM" }, \
{ V4L2_FIELD_INTERLACED, "INTERLACED" }, \
{ V4L2_FIELD_SEQ_TB, "SEQ_TB" }, \
{ V4L2_FIELD_SEQ_BT, "SEQ_BT" }, \
{ V4L2_FIELD_ALTERNATE, "ALTERNATE" }, \
{ V4L2_FIELD_INTERLACED_TB, "INTERLACED_TB" }, \
{ V4L2_FIELD_INTERLACED_BT, "INTERLACED_BT" })
__print_symbolic(field, SHOW_FIELD)
#define SHOW_FIELD \
EM( V4L2_FIELD_ANY, "ANY" ) \
EM( V4L2_FIELD_NONE, "NONE" ) \
EM( V4L2_FIELD_TOP, "TOP" ) \
EM( V4L2_FIELD_BOTTOM, "BOTTOM" ) \
EM( V4L2_FIELD_INTERLACED, "INTERLACED" ) \
EM( V4L2_FIELD_SEQ_TB, "SEQ_TB" ) \
EM( V4L2_FIELD_SEQ_BT, "SEQ_BT" ) \
EM( V4L2_FIELD_ALTERNATE, "ALTERNATE" ) \
EM( V4L2_FIELD_INTERLACED_TB, "INTERLACED_TB" ) \
EMe( V4L2_FIELD_INTERLACED_BT, "INTERLACED_BT" )
SHOW_FIELD
/*
* Now redefine the EM() and EMe() macros to map the enums to the strings
* that will be printed in the output.
*/
#undef EM
#undef EMe
#define EM(a, b) {a, b},
#define EMe(a, b) {a, b}
/* V4L2_TC_TYPE_* are macros, not defines, they do not need processing */
#define show_timecode_type(type) \
__print_symbolic(type, \