[ndctl PATCH v12 1/8] util/trace: move trace helpers from ndctl/cxl/ to ndctl/util/

[alison.schofield@intel.com]

From: Alison Schofield <alison.schofield@intel.com>

A set of helpers used to parse kernel trace events were introduced
in ndctl/cxl/ in support of the CXL monitor command. The work these
helpers perform may be useful beyond CXL.

Move them to the ndctl/util/ where other generic helpers reside.
Replace cxl-ish naming with generic names and update the single
user, cxl/monitor.c, to match.

This move is in preparation for extending the helpers in support
of cxl_poison trace events.

Signed-off-by: Alison Schofield <alison.schofield@intel.com>
---
 cxl/meson.build             |  2 +-
 cxl/monitor.c               | 11 +++++------
 {cxl => util}/event_trace.c | 21 ++++++++++-----------
 {cxl => util}/event_trace.h | 12 ++++++------
 4 files changed, 22 insertions(+), 24 deletions(-)
 rename {cxl => util}/event_trace.c (88%)
 rename {cxl => util}/event_trace.h (61%)

diff --git a/cxl/meson.build b/cxl/meson.build
index 61b4d8762b42..e4d1683ce8c6 100644
--- a/cxl/meson.build
+++ b/cxl/meson.build
@@ -27,7 +27,7 @@ deps = [
 
 if get_option('libtracefs').enabled()
   cxl_src += [
-    'event_trace.c',
+    '../util/event_trace.c',
     'monitor.c',
   ]
   deps += [
diff --git a/cxl/monitor.c b/cxl/monitor.c
index a85452a4dc82..2066f984668d 100644
--- a/cxl/monitor.c
+++ b/cxl/monitor.c
@@ -28,8 +28,7 @@
 #define ENABLE_DEBUG
 #endif
 #include <util/log.h>
-
-#include "event_trace.h"
+#include <util/event_trace.h>
 
 static const char *cxl_system = "cxl";
 const char *default_log = "/var/log/cxl-monitor.log";
@@ -87,9 +86,9 @@ static int monitor_event(struct cxl_ctx *ctx)
 		goto epoll_ctl_err;
 	}
 
-	rc = cxl_event_tracing_enable(inst, cxl_system, NULL);
+	rc = trace_event_enable(inst, cxl_system, NULL);
 	if (rc < 0) {
-		err(&monitor, "cxl_trace_event_enable() failed: %d\n", rc);
+		err(&monitor, "trace_event_enable() failed: %d\n", rc);
 		goto event_en_err;
 	}
 
@@ -112,7 +111,7 @@ static int monitor_event(struct cxl_ctx *ctx)
 		}
 
 		list_head_init(&ectx.jlist_head);
-		rc = cxl_parse_events(inst, &ectx);
+		rc = trace_event_parse(inst, &ectx);
 		if (rc < 0)
 			goto parse_err;
 
@@ -129,7 +128,7 @@ static int monitor_event(struct cxl_ctx *ctx)
 	}
 
 parse_err:
-	if (cxl_event_tracing_disable(inst) < 0)
+	if (trace_event_disable(inst) < 0)
 		err(&monitor, "failed to disable tracing\n");
 event_en_err:
 epoll_ctl_err:
diff --git a/cxl/event_trace.c b/util/event_trace.c
similarity index 88%
rename from cxl/event_trace.c
rename to util/event_trace.c
index 1b5aa09de8b2..16013412bc06 100644
--- a/cxl/event_trace.c
+++ b/util/event_trace.c
@@ -59,8 +59,8 @@ static struct json_object *num_to_json(void *num, int elem_size, unsigned long f
 	return json_object_new_int64(val);
 }
 
-static int cxl_event_to_json(struct tep_event *event, struct tep_record *record,
-			     struct list_head *jlist_head)
+static int event_to_json(struct tep_event *event, struct tep_record *record,
+			 struct list_head *jlist_head)
 {
 	struct json_object *jevent, *jobj, *jarray;
 	struct tep_format_field **fields;
@@ -200,8 +200,8 @@ err_jnode:
 	return rc;
 }
 
-static int cxl_event_parse(struct tep_event *event, struct tep_record *record,
-			   int cpu, void *ctx)
+static int event_parse(struct tep_event *event, struct tep_record *record,
+		       int cpu, void *ctx)
 {
 	struct event_ctx *event_ctx = (struct event_ctx *)ctx;
 
@@ -218,10 +218,10 @@ static int cxl_event_parse(struct tep_event *event, struct tep_record *record,
 		return event_ctx->parse_event(event, record,
 					      &event_ctx->jlist_head);
 
-	return cxl_event_to_json(event, record, &event_ctx->jlist_head);
+	return event_to_json(event, record, &event_ctx->jlist_head);
 }
 
-int cxl_parse_events(struct tracefs_instance *inst, struct event_ctx *ectx)
+int trace_event_parse(struct tracefs_instance *inst, struct event_ctx *ectx)
 {
 	struct tep_handle *tep;
 	int rc;
@@ -230,14 +230,13 @@ int cxl_parse_events(struct tracefs_instance *inst, struct event_ctx *ectx)
 	if (!tep)
 		return -ENOMEM;
 
-	rc = tracefs_iterate_raw_events(tep, inst, NULL, 0, cxl_event_parse,
-					ectx);
+	rc = tracefs_iterate_raw_events(tep, inst, NULL, 0, event_parse, ectx);
 	tep_free(tep);
 	return rc;
 }
 
-int cxl_event_tracing_enable(struct tracefs_instance *inst, const char *system,
-		const char *event)
+int trace_event_enable(struct tracefs_instance *inst, const char *system,
+		       const char *event)
 {
 	int rc;
 
@@ -252,7 +251,7 @@ int cxl_event_tracing_enable(struct tracefs_instance *inst, const char *system,
 	return 0;
 }
 
-int cxl_event_tracing_disable(struct tracefs_instance *inst)
+int trace_event_disable(struct tracefs_instance *inst)
 {
 	return tracefs_trace_off(inst);
 }
diff --git a/cxl/event_trace.h b/util/event_trace.h
similarity index 61%
rename from cxl/event_trace.h
rename to util/event_trace.h
index ec6267202c8b..37c39aded871 100644
--- a/cxl/event_trace.h
+++ b/util/event_trace.h
@@ -1,7 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /* Copyright (C) 2022 Intel Corporation. All rights reserved. */
-#ifndef __CXL_EVENT_TRACE_H__
-#define __CXL_EVENT_TRACE_H__
+#ifndef __UTIL_EVENT_TRACE_H__
+#define __UTIL_EVENT_TRACE_H__
 
 #include <json-c/json.h>
 #include <ccan/list/list.h>
@@ -19,9 +19,9 @@ struct event_ctx {
 			   struct list_head *jlist_head); /* optional */
 };
 
-int cxl_parse_events(struct tracefs_instance *inst, struct event_ctx *ectx);
-int cxl_event_tracing_enable(struct tracefs_instance *inst, const char *system,
-		const char *event);
-int cxl_event_tracing_disable(struct tracefs_instance *inst);
+int trace_event_parse(struct tracefs_instance *inst, struct event_ctx *ectx);
+int trace_event_enable(struct tracefs_instance *inst, const char *system,
+		       const char *event);
+int trace_event_disable(struct tracefs_instance *inst);
 
 #endif
-- 
2.37.3