diff mbox series

[v2,3/9] cxl: add common function to enable event trace

Message ID 166363121162.3861186.4784558227642526260.stgit@djiang5-desk3.ch.intel.com (mailing list archive)
State New, archived
Headers show
Series cxl: add monitor support for trace events | expand

Commit Message

Dave Jiang Sept. 19, 2022, 11:46 p.m. UTC 
Add a common function for cxl command to enable event tracing for the
instance created. The interested "systems" will be enabled for tracing
as well.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
---
 cxl/event_trace.c |   21 +++++++++++++++++++++
 cxl/event_trace.h |    1 +
 2 files changed, 22 insertions(+)
diff mbox series

Patch

diff --git a/cxl/event_trace.c b/cxl/event_trace.c
index 430146ce66f5..ca2fb94f2eba 100644
--- a/cxl/event_trace.c
+++ b/cxl/event_trace.c
@@ -197,3 +197,24 @@  int cxl_parse_events(struct tracefs_instance *inst, struct event_ctx *ectx)
 	tep_free(tep);
 	return rc;
 }
+
+int cxl_event_tracing_enable(struct tracefs_instance *inst, const char *system)
+{
+	int rc;
+	char *path;
+
+	rc = asprintf(&path, "events/%s/enable", system);
+	if (rc == -1)
+		return -errno;
+
+	rc = tracefs_instance_file_write(inst, path, "1");
+	free(path);
+	if (rc == -1)
+		return -errno;
+
+	if (tracefs_trace_is_on(inst))
+		return 0;
+
+	tracefs_trace_on(inst);
+	return 0;
+}
diff --git a/cxl/event_trace.h b/cxl/event_trace.h
index 2fbefa1586d9..1fb905664625 100644
--- a/cxl/event_trace.h
+++ b/cxl/event_trace.h
@@ -17,5 +17,6 @@  struct event_ctx {
 };
 
 int cxl_parse_events(struct tracefs_instance *inst, struct event_ctx *ectx);
+int cxl_event_tracing_enable(struct tracefs_instance *inst, const char *system);
 
 #endif