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[SCSI] zfcp: Add trace records for recovery thread and its queues

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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 <mp3@de.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Martin Peschke 2008-03-27 14:22:01 +01:00 committed by James Bottomley
parent d79a83dbff
commit 348447e857
4 changed files with 75 additions and 0 deletions
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51
drivers/s390/scsi/zfcp_dbf.c
View File

@ -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)

12
drivers/s390/scsi/zfcp_def.h
View File

@ -279,13 +279,25 @@ struct zfcp_erp_dbf_record {
u8 dummy[16];
} __attribute__ ((packed));
struct zfcp_rec_dbf_record_thread {
u32 sema;
u32 total;
u32 ready;
u32 running;
} __attribute__ ((packed));
struct zfcp_rec_dbf_record {
u8 id;
u8 id2;
union {
struct zfcp_rec_dbf_record_thread thread;
} u;
} __attribute__ ((packed));
enum {
ZFCP_REC_DBF_ID_THREAD,
};
struct zfcp_hba_dbf_record_response {
u32 fsf_command;
u64 fsf_reqid;

9
drivers/s390/scsi/zfcp_erp.c
View File

@ -788,6 +788,7 @@ zfcp_erp_action_ready(struct zfcp_erp_action *erp_action)
zfcp_erp_action_to_ready(erp_action);
up(&adapter->erp_ready_sem);
zfcp_rec_dbf_event_thread(2, adapter, 0);
}
/*
@ -1027,6 +1028,7 @@ zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL, &adapter->status);
up(&adapter->erp_ready_sem);
zfcp_rec_dbf_event_thread(2, adapter, 1);
wait_event(adapter->erp_thread_wqh,
!atomic_test_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP,
@ -1084,7 +1086,9 @@ zfcp_erp_thread(void *data)
* no action in 'ready' queue to be processed and
* thread is not to be killed
*/
zfcp_rec_dbf_event_thread(4, adapter, 1);
down_interruptible(&adapter->erp_ready_sem);
zfcp_rec_dbf_event_thread(5, adapter, 1);
debug_text_event(adapter->erp_dbf, 5, "a_th_woken");
}
@ -2150,7 +2154,9 @@ zfcp_erp_adapter_strategy_open_fsf_xconfig(struct zfcp_erp_action *erp_action)
* _must_ be the one belonging to the 'exchange config
* data' request.
*/
zfcp_rec_dbf_event_thread(6, adapter, 1);
down(&adapter->erp_ready_sem);
zfcp_rec_dbf_event_thread(7, adapter, 1);
if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT) {
ZFCP_LOG_INFO("error: exchange of configuration data "
"for adapter %s timed out\n",
@ -2207,7 +2213,9 @@ zfcp_erp_adapter_strategy_open_fsf_xport(struct zfcp_erp_action *erp_action)
debug_text_event(adapter->erp_dbf, 6, "a_xport_ok");
ret = ZFCP_ERP_SUCCEEDED;
zfcp_rec_dbf_event_thread(8, adapter, 1);
down(&adapter->erp_ready_sem);
zfcp_rec_dbf_event_thread(9, adapter, 1);
if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT) {
ZFCP_LOG_INFO("error: exchange port data timed out (adapter "
"%s)\n", zfcp_get_busid_by_adapter(adapter));
@ -3091,6 +3099,7 @@ zfcp_erp_action_enqueue(int action,
/* finally put it into 'ready' queue and kick erp thread */
list_add_tail(&erp_action->list, &adapter->erp_ready_head);
up(&adapter->erp_ready_sem);
zfcp_rec_dbf_event_thread(1, adapter, 0);
retval = 0;
out:
return retval;

3
drivers/s390/scsi/zfcp_ext.h
View File

@ -164,6 +164,9 @@ extern void zfcp_erp_port_access_changed(struct zfcp_port *);
extern void zfcp_erp_unit_access_changed(struct zfcp_unit *);
/******************************** AUX ****************************************/
extern void zfcp_rec_dbf_event_thread(u8 id, struct zfcp_adapter *adapter,
int lock);
extern void zfcp_hba_dbf_event_fsf_response(struct zfcp_fsf_req *);
extern void zfcp_hba_dbf_event_fsf_unsol(const char *, struct zfcp_adapter *,
struct fsf_status_read_buffer *);