linux-kernel - [RFC PATCH 9/9] cxl/test: Simulate event log overflow

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Message-Id: <20220813053243.757363-10-ira.weiny@intel.com>
Date:   Fri, 12 Aug 2022 22:32:43 -0700
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: [RFC PATCH 9/9] 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>
---
 tools/testing/cxl/test/mem.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/tools/testing/cxl/test/mem.c b/tools/testing/cxl/test/mem.c
index c5d7857ae2e5..87e6b10896c9 100644
--- a/tools/testing/cxl/test/mem.c
+++ b/tools/testing/cxl/test/mem.c
@@ -244,6 +244,15 @@ static void event_store_add_event(struct mock_event_store *es,
 	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;
+}
+
 /*
  * Get and clear event only handle 1 record at a time as this is what is
  * currently implemented in the main code.
@@ -253,6 +262,7 @@ static 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 != 1)
@@ -278,6 +288,20 @@ static 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, get_cur_event(log), sizeof(pl->record));
 	pl->record.hdr.handle = get_cur_event_handle(log);
 	return 0;
@@ -483,6 +507,18 @@ static void devm_cxl_mock_event_logs(struct cxl_memdev *cxlmd)
 	event_store_add_event(es, CXL_EVENT_TYPE_INFO,
 			      (struct cxl_event_record_raw *)&mem_mod_rec);
 
+	event_store_add_event(es, CXL_EVENT_TYPE_FAIL, &maint_needed);
+	event_store_add_event(es, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	event_store_add_event(es, CXL_EVENT_TYPE_FAIL,
+			      (struct cxl_event_record_raw *)&dram_rec);
+	event_store_add_event(es, CXL_EVENT_TYPE_FAIL,
+			      (struct cxl_event_record_raw *)&gen_media);
+	event_store_add_event(es, CXL_EVENT_TYPE_FAIL,
+			      (struct cxl_event_record_raw *)&mem_mod_rec);
+	event_store_add_event(es, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	event_store_add_event(es, CXL_EVENT_TYPE_FAIL,
+			      (struct cxl_event_record_raw *)&dram_rec);
+
 	event_store_add_event(es, CXL_EVENT_TYPE_FATAL, &hardware_replace);
 	event_store_add_event(es, CXL_EVENT_TYPE_FATAL,
 			      (struct cxl_event_record_raw *)&dram_rec);
-- 
2.35.3