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[S390] New DASD feature for ERP related logging 

It is now possible to enable/disable ERP related logging without re-compile
and re-ipl. A additional sysfs-attribute 'erplog' allows to switch the
logging non-interruptive.

Signed-off-by: Horst Hummel <horst.hummel@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Horst Hummel 2006-12-08 15:54:15 +01:00 committed by Martin Schwidefsky
parent 85eca85039
commit 9575bf2657
5 changed files with 64 additions and 22 deletions
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8
drivers/s390/block/dasd.c
View File

@ -1050,10 +1050,10 @@ dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
}
} else { /* error */
memcpy(&cqr->irb, irb, sizeof (struct irb));
#ifdef ERP_DEBUG
/* dump sense data */
dasd_log_sense(cqr, irb);
#endif
if (device->features & DASD_FEATURE_ERPLOG) {
/* dump sense data */
dasd_log_sense(cqr, irb);
}
switch (era) {
case dasd_era_fatal:
cqr->status = DASD_CQR_FAILED;

23
drivers/s390/block/dasd_3990_erp.c
View File

@ -2641,14 +2641,12 @@ dasd_3990_erp_action(struct dasd_ccw_req * cqr)
struct dasd_ccw_req *erp = NULL;
struct dasd_device *device = cqr->device;
__u32 cpa = cqr->irb.scsw.cpa;
struct dasd_ccw_req *temp_erp = NULL;
#ifdef ERP_DEBUG
/* print current erp_chain */
DEV_MESSAGE(KERN_ERR, device, "%s",
"ERP chain at BEGINNING of ERP-ACTION");
{
struct dasd_ccw_req *temp_erp = NULL;
if (device->features & DASD_FEATURE_ERPLOG) {
/* print current erp_chain */
DEV_MESSAGE(KERN_ERR, device, "%s",
"ERP chain at BEGINNING of ERP-ACTION");
for (temp_erp = cqr;
temp_erp != NULL; temp_erp = temp_erp->refers) {
@ -2658,7 +2656,6 @@ dasd_3990_erp_action(struct dasd_ccw_req * cqr)
temp_erp->refers);
}
}
#endif /* ERP_DEBUG */
/* double-check if current erp/cqr was successfull */
if ((cqr->irb.scsw.cstat == 0x00) &&
@ -2695,11 +2692,10 @@ dasd_3990_erp_action(struct dasd_ccw_req * cqr)
erp = dasd_3990_erp_handle_match_erp(cqr, erp);
}
#ifdef ERP_DEBUG
/* print current erp_chain */
DEV_MESSAGE(KERN_ERR, device, "%s", "ERP chain at END of ERP-ACTION");
{
struct dasd_ccw_req *temp_erp = NULL;
if (device->features & DASD_FEATURE_ERPLOG) {
/* print current erp_chain */
DEV_MESSAGE(KERN_ERR, device, "%s",
"ERP chain at END of ERP-ACTION");
for (temp_erp = erp;
temp_erp != NULL; temp_erp = temp_erp->refers) {
@ -2709,7 +2705,6 @@ dasd_3990_erp_action(struct dasd_ccw_req * cqr)
temp_erp->refers);
}
}
#endif /* ERP_DEBUG */
if (erp->status == DASD_CQR_FAILED)
dasd_log_ccw(erp, 1, cpa);

49
drivers/s390/block/dasd_devmap.c
View File

@ -202,6 +202,8 @@ dasd_feature_list(char *str, char **endp)
features |= DASD_FEATURE_READONLY;
else if (len == 4 && !strncmp(str, "diag", 4))
features |= DASD_FEATURE_USEDIAG;
else if (len == 6 && !strncmp(str, "erplog", 6))
features |= DASD_FEATURE_ERPLOG;
else {
MESSAGE(KERN_WARNING,
"unsupported feature: %*s, "
@ -709,6 +711,52 @@ dasd_ro_store(struct device *dev, struct device_attribute *attr,
}
static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
/*
* erplog controls the logging of ERP related data
* (e.g. failing channel programs).
*/
static ssize_t
dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct dasd_devmap *devmap;
int erplog;
devmap = dasd_find_busid(dev->bus_id);
if (!IS_ERR(devmap))
erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
else
erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n");
}
static ssize_t
dasd_erplog_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct dasd_devmap *devmap;
int val;
char *endp;
devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
if (IS_ERR(devmap))
return PTR_ERR(devmap);
val = simple_strtoul(buf, &endp, 0);
if (((endp + 1) < (buf + count)) || (val > 1))
return -EINVAL;
spin_lock(&dasd_devmap_lock);
if (val)
devmap->features |= DASD_FEATURE_ERPLOG;
else
devmap->features &= ~DASD_FEATURE_ERPLOG;
if (devmap->device)
devmap->device->features = devmap->features;
spin_unlock(&dasd_devmap_lock);
return count;
}
static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
/*
* use_diag controls whether the driver should use diag rather than ssch
@ -896,6 +944,7 @@ static struct attribute * dasd_attrs[] = {
&dev_attr_uid.attr,
&dev_attr_use_diag.attr,
&dev_attr_eer_enabled.attr,
&dev_attr_erplog.attr,
NULL,
};

4
drivers/s390/block/dasd_int.h
View File

@ -13,10 +13,6 @@
#ifdef __KERNEL__
/* erp debugging in dasd.c and dasd_3990_erp.c */
#define ERP_DEBUG
/* we keep old device allocation scheme; IOW, minors are still in 0..255 */
#define DASD_PER_MAJOR (1U << (MINORBITS - DASD_PARTN_BITS))
#define DASD_PARTN_MASK ((1 << DASD_PARTN_BITS) - 1)

2
include/asm-s390/dasd.h
View File

@ -69,11 +69,13 @@ typedef struct dasd_information2_t {
* 0x01: readonly (ro)
* 0x02: use diag discipline (diag)
* 0x04: set the device initially online (internal use only)
* 0x08: enable ERP related logging
*/
#define DASD_FEATURE_DEFAULT 0x00
#define DASD_FEATURE_READONLY 0x01
#define DASD_FEATURE_USEDIAG 0x02
#define DASD_FEATURE_INITIAL_ONLINE 0x04
#define DASD_FEATURE_ERPLOG 0x08
#define DASD_PARTN_BITS 2