[RFC PATCH 05/11] perf: allow drivers more control over event logging

[Robert Bragg <robert@sixbynine.org>]

This exports enough api to allow drivers to output their own
PERF_RECORD_DEVICE events.

Signed-off-by: Robert Bragg <robert@sixbynine.org>
---
 include/linux/perf_event.h  | 7 +++++++
 kernel/events/core.c        | 2 ++
 kernel/events/internal.h    | 9 ---------
 kernel/events/ring_buffer.c | 3 +++
 4 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 69a0cb9..293f041 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -633,6 +633,10 @@ struct perf_sample_data {
 		    PERF_MEM_S(LOCK, NA)  |\
 		    PERF_MEM_S(TLB, NA))
 
+extern void perf_event_header__init_id(struct perf_event_header *header,
+				       struct perf_sample_data *data,
+				       struct perf_event *event);
+
 static inline void perf_sample_data_init(struct perf_sample_data *data,
 					 u64 addr, u64 period)
 {
@@ -654,6 +658,9 @@ extern void perf_prepare_sample(struct perf_event_header *header,
 				struct perf_sample_data *data,
 				struct perf_event *event,
 				struct pt_regs *regs);
+extern void perf_event__output_id_sample(struct perf_event *event,
+					 struct perf_output_handle *handle,
+					 struct perf_sample_data *sample);
 
 extern int perf_event_overflow(struct perf_event *event,
 				 struct perf_sample_data *data,
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 340deaa..26b84fc 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -4793,6 +4793,7 @@ void perf_event_header__init_id(struct perf_event_header *header,
 	if (event->attr.sample_id_all)
 		__perf_event_header__init_id(header, data, event);
 }
+EXPORT_SYMBOL_GPL(perf_event_header__init_id);
 
 static void __perf_event__output_id_sample(struct perf_output_handle *handle,
 					   struct perf_sample_data *data)
@@ -4825,6 +4826,7 @@ void perf_event__output_id_sample(struct perf_event *event,
 	if (event->attr.sample_id_all)
 		__perf_event__output_id_sample(handle, sample);
 }
+EXPORT_SYMBOL_GPL(perf_event__output_id_sample);
 
 static void perf_output_read_one(struct perf_output_handle *handle,
 				 struct perf_event *event,
diff --git a/kernel/events/internal.h b/kernel/events/internal.h
index 569b2187..3c86bb3 100644
--- a/kernel/events/internal.h
+++ b/kernel/events/internal.h
@@ -44,15 +44,6 @@ extern struct ring_buffer *
 rb_alloc(int nr_pages, long watermark, int cpu, int flags);
 extern void perf_event_wakeup(struct perf_event *event);
 
-extern void
-perf_event_header__init_id(struct perf_event_header *header,
-			   struct perf_sample_data *data,
-			   struct perf_event *event);
-extern void
-perf_event__output_id_sample(struct perf_event *event,
-			     struct perf_output_handle *handle,
-			     struct perf_sample_data *sample);
-
 extern struct page *
 perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff);
 
diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c
index eadb95c..fa100d4 100644
--- a/kernel/events/ring_buffer.c
+++ b/kernel/events/ring_buffer.c
@@ -202,12 +202,14 @@ out:
 
 	return -ENOSPC;
 }
+EXPORT_SYMBOL_GPL(perf_output_begin);
 
 unsigned int perf_output_copy(struct perf_output_handle *handle,
 		      const void *buf, unsigned int len)
 {
 	return __output_copy(handle, buf, len);
 }
+EXPORT_SYMBOL_GPL(perf_output_copy);
 
 unsigned int perf_output_skip(struct perf_output_handle *handle,
 			      unsigned int len)
@@ -220,6 +222,7 @@ void perf_output_end(struct perf_output_handle *handle)
 	perf_output_put_handle(handle);
 	rcu_read_unlock();
 }
+EXPORT_SYMBOL_GPL(perf_output_end);
 
 static void
 ring_buffer_init(struct ring_buffer *rb, long watermark, int flags)
-- 
2.3.2