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

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Message-Id: <20221110185758.879472-12-ira.weiny@intel.com>
Date:   Thu, 10 Nov 2022 10:57:58 -0800
From:   ira.weiny@...el.com
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Ira Weiny <ira.weiny@...el.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Ben Widawsky <bwidawsk@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        linux-kernel@...r.kernel.org, linux-cxl@...r.kernel.org
Subject: [PATCH 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.

Signed-off-by: Ira Weiny <ira.weiny@...el.com>

---
Changes from RFC
	Adjust for new struct changes
---
 tools/testing/cxl/test/events.c | 37 +++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/tools/testing/cxl/test/events.c b/tools/testing/cxl/test/events.c
index 8693f3fb9cbb..5ce257114f4e 100644
--- a/tools/testing/cxl/test/events.c
+++ b/tools/testing/cxl/test/events.c
@@ -69,11 +69,21 @@ static void event_store_add_event(struct mock_event_store *mes,
 	log->nr_events++;
 }
 
+static u16 log_overflow(struct mock_event_log *log)
+{
+	int cnt = log_rec_left(log) - 5;
+
+	if (cnt < 0)
+		return 0;
+	return cnt;
+}
+
 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;
 	u8 log_type;
+	u16 nr_overflow;
 
 	/* Valid request? */
 	if (cmd->size_in != sizeof(log_type))
@@ -95,6 +105,20 @@ int mock_get_event(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *cmd)
 	if (log_rec_left(log) > 1)
 		pl->flags |= CXL_GET_EVENT_FLAG_MORE_RECORDS;
 
+	nr_overflow = log_overflow(log);
+	if (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);
+	}
+
 	memcpy(&pl->record[0], get_cur_event(log), sizeof(pl->record[0]));
 	pl->record[0].hdr.handle = get_cur_event_handle(log);
 	return 0;
@@ -274,6 +298,19 @@ 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);
+	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