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scsi: qla2xxx: add ring buffer for tracing debug logs

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Having this log in a ring buffer helps to diagnose qla2xxx driver and
firmware issues instead of having to reproduce the problem with
extended_logging enabled. This saves cycles and helps when it is hard
to reproduce problem.

Link: https://lore.kernel.org/r/1581557368-32080-1-git-send-email-rajan.shanmugavelu@oracle.com
Reviewed-by: Joe Jin <joe.jin@oracle.com>
Acked-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Rajan Shanmugavelu <rajan.shanmugavelu@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Rajan Shanmugavelu 2020-02-12 17:29:28 -08:00 • committed by Martin K. Petersen
parent 779dfcf643
commit 598a90f200
2 changed files with 59 additions and 3 deletions
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23
drivers/scsi/qla2xxx/qla_dbg.c
View file

@ -73,6 +73,8 @@
#include "qla_def.h" #include "qla_def.h"
#include <linux/delay.h> #include <linux/delay.h>
#define CREATE_TRACE_POINTS
#include <trace/events/qla.h>
static uint32_t ql_dbg_offset = 0x800; static uint32_t ql_dbg_offset = 0x800;
@ -2537,15 +2539,30 @@ ql_dbg(uint level, scsi_qla_host_t *vha, uint id, const char *fmt, ...)
{ {
va_list va; va_list va;
struct va_format vaf; struct va_format vaf;
char pbuf[64];
if (!ql_mask_match(level))
return;
va_start(va, fmt); va_start(va, fmt);
vaf.fmt = fmt; vaf.fmt = fmt;
vaf.va = &va; vaf.va = &va;
if (!ql_mask_match(level)) {
if (vha != NULL) {
const struct pci_dev *pdev = vha->hw->pdev;
/* <module-name> <msg-id>:<host> Message */
snprintf(pbuf, sizeof(pbuf), "%s [%s]-%04x:%ld: ",
QL_MSGHDR, dev_name(&(pdev->dev)), id,
vha->host_no);
} else {
snprintf(pbuf, sizeof(pbuf), "%s [%s]-%04x: : ",
QL_MSGHDR, "0000:00:00.0", id);
}
pbuf[sizeof(pbuf) - 1] = 0;
trace_ql_dbg_log(pbuf, &vaf);
va_end(va);
return;
}
if (vha != NULL) { if (vha != NULL) {
const struct pci_dev *pdev = vha->hw->pdev; const struct pci_dev *pdev = vha->hw->pdev;
/* <module-name> <pci-name> <msg-id>:<host> Message */ /* <module-name> <pci-name> <msg-id>:<host> Message */

39
include/trace/events/qla.h Normal file
View file

@ -0,0 +1,39 @@
/* SPDX-License-Identifier: GPL-2.0 */
#if !defined(_TRACE_QLA_H_) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_QLA_H_
#include <linux/tracepoint.h>
#undef TRACE_SYSTEM
#define TRACE_SYSTEM qla
#define QLA_MSG_MAX 256
DECLARE_EVENT_CLASS(qla_log_event,
TP_PROTO(const char *buf,
struct va_format *vaf),
TP_ARGS(buf, vaf),
TP_STRUCT__entry(
__string(buf, buf)
__dynamic_array(char, msg, QLA_MSG_MAX)
),
TP_fast_assign(
__assign_str(buf, buf);
vsnprintf(__get_str(msg), QLA_MSG_MAX, vaf->fmt, *vaf->va);
),
TP_printk("%s %s", __get_str(buf), __get_str(msg))
);
DEFINE_EVENT(qla_log_event, ql_dbg_log,
TP_PROTO(const char *buf, struct va_format *vaf),
TP_ARGS(buf, vaf)
);
#endif /* _TRACE_QLA_H */
#define TRACE_INCLUDE_FILE qla
#include <trace/define_trace.h>