Re: [PATCH v7 8/8] cxl/test: Simulate event log overflow

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On 1/17/23 10:53 PM, Ira Weiny wrote:
Log overflow is marked by a separate trace message.

Simulate a log with lots of messages and flag overflow until space is
cleared.

Reviewed-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>

Reviewed-by: Dave Jiang <dave.jiang@xxxxxxxxx>


---
Changes in v7:
         <no change>
---
  tools/testing/cxl/test/mem.c | 50 +++++++++++++++++++++++++++++++++++++++++++-
  1 file changed, 49 insertions(+), 1 deletion(-)

diff --git a/tools/testing/cxl/test/mem.c b/tools/testing/cxl/test/mem.c
index 00bf19a68604..9263b04d35f7 100644
--- a/tools/testing/cxl/test/mem.c
+++ b/tools/testing/cxl/test/mem.c
@@ -78,6 +78,8 @@ 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];
  };
@@ -116,6 +118,7 @@ static void event_reset_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 */
@@ -147,8 +150,12 @@ static void mes_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++;
@@ -159,6 +166,7 @@ static int mock_get_event(struct cxl_dev_state *cxlds,
  {
  	struct cxl_get_event_payload *pl;
  	struct mock_event_log *log;
+	u16 nr_overflow;
  	u8 log_type;
  	int i;
@@ -191,6 +199,19 @@ static int mock_get_event(struct cxl_dev_state *cxlds,
  	if (!event_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);
+	}
+
  	return 0;
  }
@@ -231,6 +252,9 @@ static int mock_clear_event(struct cxl_dev_state *cxlds,
  		}
  	}
+ if (log->nr_overflow)
+		log->nr_overflow = 0;
+
  	/* Clear events */
  	log->clear_idx += pl->nr_recs;
  	return 0;
@@ -353,6 +377,30 @@ static void cxl_mock_add_event_logs(struct mock_event_store *mes)
  		      (struct cxl_event_record_raw *)&mem_module);
  	mes->ev_status |= CXLDEV_EVENT_STATUS_INFO;
+ mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &maint_needed);
+	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	mes_add_event(mes, CXL_EVENT_TYPE_FAIL,
+		      (struct cxl_event_record_raw *)&dram);
+	mes_add_event(mes, CXL_EVENT_TYPE_FAIL,
+		      (struct cxl_event_record_raw *)&gen_media);
+	mes_add_event(mes, CXL_EVENT_TYPE_FAIL,
+		      (struct cxl_event_record_raw *)&mem_module);
+	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	mes_add_event(mes, CXL_EVENT_TYPE_FAIL,
+		      (struct cxl_event_record_raw *)&dram);
+	/* Overflow this log */
+	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
+	mes->ev_status |= CXLDEV_EVENT_STATUS_FAIL;
+
  	mes_add_event(mes, CXL_EVENT_TYPE_FATAL, &hardware_replace);
  	mes_add_event(mes, CXL_EVENT_TYPE_FATAL,
  		      (struct cxl_event_record_raw *)&dram);




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