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[SCSI] zfcp: Only collect FSF/HBA debug data for matching trace levels
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The default trace level is to only trace failed FSF commands. Thus it
is not necessary to collect trace data for most FSF commands, since
it will be thrown away later. Restructure the FSF/HBA trace
infrastructure to first check the trace level in a inline function and
only do the expensive data collection for matching trace levels.

Reviewed-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
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Christof Schmitt authored and James Bottomley committed Sep 5, 2009
1 parent dcd20e2 commit 2e261af
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Showing 3 changed files with 67 additions and 39 deletions.
44 changes: 8 additions & 36 deletions drivers/s390/scsi/zfcp_dbf.c
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Original file line number Diff line number Diff line change
Expand Up @@ -120,14 +120,10 @@ static int zfcp_dbf_view_header(debug_info_t *id, struct debug_view *view,
return p - out_buf;
}

/**
* zfcp_hba_dbf_event_fsf_response - trace event for request completion
* @fsf_req: request that has been completed
*/
void zfcp_hba_dbf_event_fsf_response(struct zfcp_fsf_req *fsf_req)
void _zfcp_hba_dbf_event_fsf_response(const char *tag2, int level,
struct zfcp_fsf_req *fsf_req,
struct zfcp_dbf *dbf)
{
struct zfcp_adapter *adapter = fsf_req->adapter;
struct zfcp_dbf *dbf = adapter->dbf;
struct fsf_qtcb *qtcb = fsf_req->qtcb;
union fsf_prot_status_qual *prot_status_qual =
&qtcb->prefix.prot_status_qual;
Expand All @@ -138,31 +134,12 @@ void zfcp_hba_dbf_event_fsf_response(struct zfcp_fsf_req *fsf_req)
struct zfcp_send_els *send_els;
struct zfcp_hba_dbf_record *rec = &dbf->hba_dbf_buf;
struct zfcp_hba_dbf_record_response *response = &rec->u.response;
int level;
unsigned long flags;

spin_lock_irqsave(&dbf->hba_dbf_lock, flags);
memset(rec, 0, sizeof(*rec));
strncpy(rec->tag, "resp", ZFCP_DBF_TAG_SIZE);

if ((qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
(qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
strncpy(rec->tag2, "perr", ZFCP_DBF_TAG_SIZE);
level = 1;
} else if (qtcb->header.fsf_status != FSF_GOOD) {
strncpy(rec->tag2, "ferr", ZFCP_DBF_TAG_SIZE);
level = 1;
} else if ((fsf_req->fsf_command == FSF_QTCB_OPEN_PORT_WITH_DID) ||
(fsf_req->fsf_command == FSF_QTCB_OPEN_LUN)) {
strncpy(rec->tag2, "open", ZFCP_DBF_TAG_SIZE);
level = 4;
} else if (qtcb->header.log_length) {
strncpy(rec->tag2, "qtcb", ZFCP_DBF_TAG_SIZE);
level = 5;
} else {
strncpy(rec->tag2, "norm", ZFCP_DBF_TAG_SIZE);
level = 6;
}
strncpy(rec->tag2, tag2, ZFCP_DBF_TAG_SIZE);

response->fsf_command = fsf_req->fsf_command;
response->fsf_reqid = fsf_req->req_id;
Expand Down Expand Up @@ -241,14 +218,9 @@ void zfcp_hba_dbf_event_fsf_response(struct zfcp_fsf_req *fsf_req)
spin_unlock_irqrestore(&dbf->hba_dbf_lock, flags);
}

/**
* zfcp_hba_dbf_event_fsf_unsol - trace event for an unsolicited status buffer
* @tag: tag indicating which kind of unsolicited status has been received
* @adapter: adapter that has issued the unsolicited status buffer
* @status_buffer: buffer containing payload of unsolicited status
*/
void zfcp_hba_dbf_event_fsf_unsol(const char *tag, struct zfcp_adapter *adapter,
struct fsf_status_read_buffer *status_buffer)
void _zfcp_hba_dbf_event_fsf_unsol(const char *tag, int level,
struct zfcp_adapter *adapter,
struct fsf_status_read_buffer *status_buffer)
{
struct zfcp_dbf *dbf = adapter->dbf;
struct zfcp_hba_dbf_record *rec = &dbf->hba_dbf_buf;
Expand Down Expand Up @@ -296,7 +268,7 @@ void zfcp_hba_dbf_event_fsf_unsol(const char *tag, struct zfcp_adapter *adapter,
&status_buffer->payload, rec->u.status.payload_size);
}

debug_event(dbf->hba_dbf, 2, rec, sizeof(*rec));
debug_event(dbf->hba_dbf, level, rec, sizeof(*rec));
spin_unlock_irqrestore(&dbf->hba_dbf_lock, flags);
}

Expand Down
53 changes: 53 additions & 0 deletions drivers/s390/scsi/zfcp_dbf.h
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Original file line number Diff line number Diff line change
Expand Up @@ -239,6 +239,59 @@ struct zfcp_dbf {
struct zfcp_scsi_dbf_record scsi_dbf_buf;
};

static inline
void zfcp_hba_dbf_event_fsf_resp(const char *tag2, int level,
struct zfcp_fsf_req *req, struct zfcp_dbf *dbf)
{
if (level <= dbf->hba_dbf->level)
_zfcp_hba_dbf_event_fsf_response(tag2, level, req, dbf);
}

/**
* zfcp_hba_dbf_event_fsf_response - trace event for request completion
* @fsf_req: request that has been completed
*/
static inline void zfcp_hba_dbf_event_fsf_response(struct zfcp_fsf_req *req)
{
struct zfcp_dbf *dbf = req->adapter->dbf;
struct fsf_qtcb *qtcb = req->qtcb;

if ((qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
(qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
zfcp_hba_dbf_event_fsf_resp("perr", 1, req, dbf);

} else if (qtcb->header.fsf_status != FSF_GOOD) {
zfcp_hba_dbf_event_fsf_resp("ferr", 1, req, dbf);

} else if ((req->fsf_command == FSF_QTCB_OPEN_PORT_WITH_DID) ||
(req->fsf_command == FSF_QTCB_OPEN_LUN)) {
zfcp_hba_dbf_event_fsf_resp("open", 4, req, dbf);

} else if (qtcb->header.log_length) {
zfcp_hba_dbf_event_fsf_resp("qtcb", 5, req, dbf);

} else {
zfcp_hba_dbf_event_fsf_resp("norm", 6, req, dbf);
}
}

/**
* zfcp_hba_dbf_event_fsf_unsol - trace event for an unsolicited status buffer
* @tag: tag indicating which kind of unsolicited status has been received
* @adapter: adapter that has issued the unsolicited status buffer
* @status_buffer: buffer containing payload of unsolicited status
*/
static inline
void zfcp_hba_dbf_event_fsf_unsol(const char *tag, struct zfcp_adapter *adapter,
struct fsf_status_read_buffer *buf)
{
struct zfcp_dbf *dbf = adapter->dbf;
int level = 2;

if (level <= dbf->hba_dbf->level)
_zfcp_hba_dbf_event_fsf_unsol(tag, level, adapter, buf);
}

static inline
void zfcp_scsi_dbf_event(const char *tag, const char *tag2, int level,
struct zfcp_adapter *adapter, struct scsi_cmnd *scmd,
Expand Down
9 changes: 6 additions & 3 deletions drivers/s390/scsi/zfcp_ext.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -45,9 +45,12 @@ extern void zfcp_rec_dbf_event_trigger(char *, void *, u8, u8, void *,
struct zfcp_adapter *,
struct zfcp_port *, struct zfcp_unit *);
extern void zfcp_rec_dbf_event_action(char *, struct zfcp_erp_action *);
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 *);
extern void _zfcp_hba_dbf_event_fsf_response(const char *, int level,
struct zfcp_fsf_req *,
struct zfcp_dbf *dbf);
extern void _zfcp_hba_dbf_event_fsf_unsol(const char *, int level,
struct zfcp_adapter *,
struct fsf_status_read_buffer *);
extern void zfcp_hba_dbf_event_qdio(struct zfcp_adapter *, unsigned int, int,
int);
extern void zfcp_hba_dbf_event_berr(struct zfcp_adapter *,
Expand Down

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