From 80e534e597163ef2fd4fc3bff3d441420914e0d2 Mon Sep 17 00:00:00 2001
From: caixiaomeng 00662745 <caixiaomeng2@huawei.com>
Date: Wed, 29 Nov 2023 14:31:46 +0800
Subject: [PATCH 27/85] anolis: Add dynamic switch of ras events support.

Rasdaemon does not support a way to disable some events by config.
If user want to disable specified event(eg:block_rq_complete), he
should recompile rasdaemon, which is not so convenient.

This patch add dynamic switch of ras event support.You can add
events you want to disabled in /etc/sysconfig/rasdaemon.For example,
`DISABLE="ras:mc_event,block:block_rq_complete"`.Then restart
rasdaemon, these two events will be disabled without recompilation.

[mchehab: make is_disabled_event() static]
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
[Ruidong: delete cxl code]
---
 ras-events.c | 35 ++++++++++++++++++++++++++++-------
 rasdaemon.c  |  3 +++
 2 files changed, 31 insertions(+), 7 deletions(-)

diff --git a/ras-events.c b/ras-events.c
index 9ad34f8..31a4e0b 100644
--- a/ras-events.c
+++ b/ras-events.c
@@ -57,6 +57,8 @@
 	#define ENDIAN KBUFFER_ENDIAN_BIG
 #endif
 
+extern char* choices_disable;
+
 static int get_debugfs_dir(char *tracing_dir, size_t len)
 {
 	FILE *fp;
@@ -147,6 +149,18 @@ static int get_tracing_dir(struct ras_events *ras)
 	return 0;
 }
 
+static int is_disabled_event(char *group, char *event) {
+	char ras_event_name[MAX_PATH + 1];
+
+	snprintf(ras_event_name, sizeof(ras_event_name), "%s:%s",
+			group, event);
+
+	if (choices_disable != NULL && strlen(choices_disable) != 0 && strstr(choices_disable, ras_event_name)) {
+		return 1;
+	}
+	return 0;
+}
+
 /*
  * Tracing enable/disable code
  */
@@ -155,6 +169,7 @@ static int __toggle_ras_mc_event(struct ras_events *ras,
 {
 	int fd, rc;
 	char fname[MAX_PATH + 1];
+	enable = is_disabled_event(group, event) ? 0 : 1;
 
 	snprintf(fname, sizeof(fname), "%s%s:%s\n",
 		 enable ? "" : "!",
@@ -775,6 +790,12 @@ static int add_event_handler(struct ras_events *ras, struct pevent *pevent,
 
 	ras->filters[id] = filter;
 
+	if (is_disabled_event(group, event)) {
+		log(ALL, LOG_INFO, "Disabled %s:%s tracing from config\n",
+                    group, event);
+		return -EINVAL;
+	}
+
 	/* Enable RAS events */
 	rc = __toggle_ras_mc_event(ras, group, event, 1);
 	free(page);
@@ -842,7 +863,7 @@ int handle_ras_events(int record_events)
 			       ras_mc_event_handler, NULL, MC_EVENT);
 	if (!rc)
 		num_events++;
-	else
+	else if (rc != -EINVAL)
 		log(ALL, LOG_ERR, "Can't get traces from %s:%s\n",
 		    "ras", "mc_event");
 
@@ -851,7 +872,7 @@ int handle_ras_events(int record_events)
 			       ras_aer_event_handler, NULL, AER_EVENT);
 	if (!rc)
 		num_events++;
-	else
+	else if (rc != -EINVAL)
 		log(ALL, LOG_ERR, "Can't get traces from %s:%s\n",
 		    "ras", "aer_event");
 #endif
@@ -861,7 +882,7 @@ int handle_ras_events(int record_events)
 			       ras_non_standard_event_handler, NULL, NON_STANDARD_EVENT);
 	if (!rc)
 		num_events++;
-	else
+	else if (rc != -EINVAL)
 		log(ALL, LOG_ERR, "Can't get traces from %s:%s\n",
 		    "ras", "non_standard_event");
 #endif
@@ -871,7 +892,7 @@ int handle_ras_events(int record_events)
 			       ras_arm_event_handler, NULL, ARM_EVENT);
 	if (!rc)
 		num_events++;
-	else
+	else if (rc != -EINVAL)
 		log(ALL, LOG_ERR, "Can't get traces from %s:%s\n",
 		    "ras", "arm_event");
 #endif
@@ -905,7 +926,7 @@ int handle_ras_events(int record_events)
 		/* tell kernel we are listening, so don't printk to console */
 		(void)open("/sys/kernel/debug/ras/daemon_active", 0);
 		num_events++;
-	} else
+	} else if (rc != -EINVAL)
 		log(ALL, LOG_ERR, "Can't get traces from %s:%s\n",
 		    "ras", "extlog_mem_event");
 #endif
@@ -922,7 +943,7 @@ int handle_ras_events(int record_events)
 			       ras_devlink_event_handler, filter_str, DEVLINK_EVENT);
 	if (!rc)
 		num_events++;
-	else
+	else if (rc != -EINVAL)
 		log(ALL, LOG_ERR, "Can't get traces from %s:%s\n",
 		    "devlink", "devlink_health_report");
 #endif
@@ -946,7 +967,7 @@ int handle_ras_events(int record_events)
 			       ras_memory_failure_event_handler, NULL, MF_EVENT);
 	if (!rc)
 		num_events++;
-	else
+	else if (rc != -EINVAL)
 		log(ALL, LOG_ERR, "Can't get traces from %s:%s\n",
 		    "ras", "memory_failure_event");
 #endif
diff --git a/rasdaemon.c b/rasdaemon.c
index e9a3a4d..0db51c9 100644
--- a/rasdaemon.c
+++ b/rasdaemon.c
@@ -33,6 +33,8 @@
 #define TOOL_NAME "rasdaemon"
 #define TOOL_DESCRIPTION "RAS daemon to log the RAS events."
 #define ARGS_DOC "<options>"
+#define DISABLE "DISABLE"
+char *choices_disable = NULL;
 
 const char *argp_program_version = TOOL_NAME " " VERSION;
 const char *argp_program_bug_address = "Mauro Carvalho Chehab <mchehab@kernel.org>";
@@ -127,6 +129,7 @@ int main(int argc, char *argv[])
 {
 	struct arguments args;
 	int idx = -1;
+	choices_disable = getenv(DISABLE);
 
 #ifdef HAVE_MCE
 	const struct argp_option offline_options[] = {
-- 
2.33.1