linux-kernel - [PATCH V2 11/11] cxl/test: Simulate event log overflow

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Date:   Wed, 30 Nov 2022 16:27:19 -0800
From:   ira.weiny@...el.com
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Ira Weiny <ira.weiny@...el.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Ben Widawsky <bwidawsk@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        Dave Jiang <dave.jiang@...el.com>,
        linux-kernel@...r.kernel.org, linux-cxl@...r.kernel.org
Subject: [PATCH V2 11/11] cxl/test: Simulate event log overflow

From: Ira Weiny <ira.weiny@...el.com>

Log overflow is marked by a separate trace message.

Simulate a log with lots of messages and flag overflow until it is
drained a bit.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Ira Weiny <ira.weiny@...el.com>

---
Changes from RFC
	Adjust for new struct changes
---
 tools/testing/cxl/test/events.c | 49 ++++++++++++++++++++++++++++++++-
 1 file changed, 48 insertions(+), 1 deletion(-)

diff --git a/tools/testing/cxl/test/events.c b/tools/testing/cxl/test/events.c
index 0bcc485e07da..ceabefb526c2 100644
--- a/tools/testing/cxl/test/events.c
+++ b/tools/testing/cxl/test/events.c
@@ -15,6 +15,8 @@ struct mock_event_log {
 	u16 clear_idx;
 	u16 cur_idx;
 	u16 nr_events;
+	u16 nr_overflow;
+	u16 overflow_reset;
 	struct cxl_event_record_raw *events[CXL_TEST_EVENT_CNT_MAX];
 };
 
@@ -45,6 +47,7 @@ void reset_event_log(struct mock_event_log *log)
 {
 	log->cur_idx = 0;
 	log->clear_idx = 0;
+	log->nr_overflow = log->overflow_reset;
 }
 
 /* Handle can never be 0 use 1 based indexing for handle */
@@ -76,8 +79,12 @@ static void event_store_add_event(struct mock_event_store *mes,
 		return;
 
 	log = &mes->mock_logs[log_type];
-	if (WARN_ON(log->nr_events >= CXL_TEST_EVENT_CNT_MAX))
+
+	if ((log->nr_events + 1) > CXL_TEST_EVENT_CNT_MAX) {
+		log->nr_overflow++;
+		log->overflow_reset = log->nr_overflow;
 		return;
+	}
 
 	log->events[log->nr_events] = event;
 	log->nr_events++;
@@ -87,6 +94,7 @@ int mock_get_event(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *cmd)
 {
 	struct cxl_get_event_payload *pl;
 	struct mock_event_log *log;
+	u16 nr_overflow;
 	u8 log_type;
 	int i;
 
@@ -118,6 +126,21 @@ int mock_get_event(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *cmd)
 	if (!log_empty(log))
 		pl->flags |= CXL_GET_EVENT_FLAG_MORE_RECORDS;
 
+	if (log->nr_overflow) {
+		u64 ns;
+
+		pl->flags |= CXL_GET_EVENT_FLAG_OVERFLOW;
+		pl->overflow_err_count = cpu_to_le16(nr_overflow);
+		ns = ktime_get_real_ns();
+		ns -= 5000000000; /* 5s ago */
+		pl->first_overflow_timestamp = cpu_to_le64(ns);
+		ns = ktime_get_real_ns();
+		ns -= 1000000000; /* 1s ago */
+		pl->last_overflow_timestamp = cpu_to_le64(ns);
+
+		log->nr_overflow = 0;
+	}
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(mock_get_event);
@@ -297,6 +320,30 @@ u32 cxl_mock_add_event_logs(struct cxl_dev_state *cxlds)
 			      (struct cxl_event_record_raw *)&mem_module);
 	mes->ev_status |= CXLDEV_EVENT_STATUS_INFO;
 
+	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &maint_needed);
+	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL,
+			      (struct cxl_event_record_raw *)&dram);
+	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL,
+			      (struct cxl_event_record_raw *)&gen_media);
+	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL,
+			      (struct cxl_event_record_raw *)&mem_module);
+	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL,
+			      (struct cxl_event_record_raw *)&dram);
+	/* Overflow this log */
+	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	mes->ev_status |= CXLDEV_EVENT_STATUS_FAIL;
+
 	event_store_add_event(mes, CXL_EVENT_TYPE_FATAL, &hardware_replace);
 	event_store_add_event(mes, CXL_EVENT_TYPE_FATAL,
 			      (struct cxl_event_record_raw *)&dram);
-- 
2.37.2