From 348447e85749120ad600a5c8e23b6bb7058b931d Mon Sep 17 00:00:00 2001 From: Martin Peschke Date: Thu, 27 Mar 2008 14:22:01 +0100 Subject: [SCSI] zfcp: Add trace records for recovery thread and its queues This patch writes trace records which provide information about the operation of the zfcp error recovery thread and the queues it works on. Signed-off-by: Martin Peschke Signed-off-by: Christof Schmitt Signed-off-by: James Bottomley --- drivers/s390/scsi/zfcp_dbf.c | 51 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) (limited to 'drivers/s390/scsi/zfcp_dbf.c') diff --git a/drivers/s390/scsi/zfcp_dbf.c b/drivers/s390/scsi/zfcp_dbf.c index e7712eb13ee..5a4b1e9a8b5 100644 --- a/drivers/s390/scsi/zfcp_dbf.c +++ b/drivers/s390/scsi/zfcp_dbf.c @@ -521,9 +521,19 @@ static struct debug_view zfcp_hba_dbf_view = { }; static const char *zfcp_rec_dbf_tags[] = { + [ZFCP_REC_DBF_ID_THREAD] = "thread", }; static const char *zfcp_rec_dbf_ids[] = { + [1] = "new", + [2] = "ready", + [3] = "kill", + [4] = "down sleep", + [5] = "down wakeup", + [6] = "down sleep ecd", + [7] = "down wakeup ecd", + [8] = "down sleep epd", + [9] = "down wakeup epd", }; static int zfcp_rec_dbf_view_format(debug_info_t *id, struct debug_view *view, @@ -536,6 +546,12 @@ static int zfcp_rec_dbf_view_format(debug_info_t *id, struct debug_view *view, zfcp_dbf_outs(&p, "hint", zfcp_rec_dbf_ids[r->id2]); zfcp_dbf_out(&p, "id", "%d", r->id2); switch (r->id) { + case ZFCP_REC_DBF_ID_THREAD: + zfcp_dbf_out(&p, "sema", "%d", r->u.thread.sema); + zfcp_dbf_out(&p, "total", "%d", r->u.thread.total); + zfcp_dbf_out(&p, "ready", "%d", r->u.thread.ready); + zfcp_dbf_out(&p, "running", "%d", r->u.thread.running); + break; } sprintf(p, "\n"); return (p - buf) + 1; @@ -550,6 +566,41 @@ static struct debug_view zfcp_rec_dbf_view = { NULL }; +/** + * zfcp_rec_dbf_event_thread - trace event related to recovery thread operation + * @id2: identifier for event + * @adapter: adapter + * @lock: non-zero value indicates that erp_lock has not yet been acquired + */ +void zfcp_rec_dbf_event_thread(u8 id2, struct zfcp_adapter *adapter, int lock) +{ + struct zfcp_rec_dbf_record *r = &adapter->rec_dbf_buf; + unsigned long flags = 0; + struct list_head *entry; + unsigned ready = 0, running = 0, total; + + if (lock) + read_lock_irqsave(&adapter->erp_lock, flags); + list_for_each(entry, &adapter->erp_ready_head) + ready++; + list_for_each(entry, &adapter->erp_running_head) + running++; + total = adapter->erp_total_count; + if (lock) + read_unlock_irqrestore(&adapter->erp_lock, flags); + + spin_lock_irqsave(&adapter->rec_dbf_lock, flags); + memset(r, 0, sizeof(*r)); + r->id = ZFCP_REC_DBF_ID_THREAD; + r->id2 = id2; + r->u.thread.sema = atomic_read(&adapter->erp_ready_sem.count); + r->u.thread.total = total; + r->u.thread.ready = ready; + r->u.thread.running = running; + debug_event(adapter->rec_dbf, 5, r, sizeof(*r)); + spin_unlock_irqrestore(&adapter->rec_dbf_lock, flags); +} + static void _zfcp_san_dbf_event_common_ct(const char *tag, struct zfcp_fsf_req *fsf_req, u32 s_id, u32 d_id, void *buffer, int buflen) -- cgit v1.2.3