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    Subject[RFC PATCH 9/9] cxl/test: Simulate event log overflow
    Date
    From: Ira Weiny <ira.weiny@intel.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@intel.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
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