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s390/dasd: configurable IFCC handling

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Make the behavior in case of constant IFCC/CCC errors configurable.
Add a sysfs attribute to switch between path disabled after threshold
exceeded (default) and message only.

Reviewed-by: Jan Hoeppner <hoeppner@linux.vnet.ibm.com>
Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Stefan Haberland
2017-12-19 16:18:38 +01:00
committed by Martin Schwidefsky
parent 66aec64721
commit ddc1c94535
3 changed files with 77 additions and 21 deletions
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43
drivers/s390/block/dasd_devmap.c
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@@ -1550,9 +1550,49 @@ dasd_path_threshold_store(struct device *dev, struct device_attribute *attr,
dasd_put_device(device);
return count;
}
static DEVICE_ATTR(path_threshold, 0644, dasd_path_threshold_show,
dasd_path_threshold_store);
/*
* configure if path is disabled after IFCC/CCC error threshold is
* exceeded
*/
static ssize_t
dasd_path_autodisable_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dasd_devmap *devmap;
int flag;
devmap = dasd_find_busid(dev_name(dev));
if (!IS_ERR(devmap))
flag = (devmap->features & DASD_FEATURE_PATH_AUTODISABLE) != 0;
else
flag = (DASD_FEATURE_DEFAULT &
DASD_FEATURE_PATH_AUTODISABLE) != 0;
return snprintf(buf, PAGE_SIZE, flag ? "1\n" : "0\n");
}
static ssize_t
dasd_path_autodisable_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
unsigned int val;
int rc;
if (kstrtouint(buf, 0, &val) || val > 1)
return -EINVAL;
rc = dasd_set_feature(to_ccwdev(dev),
DASD_FEATURE_PATH_AUTODISABLE, val);
return rc ? : count;
}
static DEVICE_ATTR(path_autodisable, 0644,
dasd_path_autodisable_show,
dasd_path_autodisable_store);
/*
* interval for IFCC/CCC checks
* meaning time with no IFCC/CCC error before the error counter
@@ -1623,6 +1663,7 @@ static struct attribute * dasd_attrs[] = {
&dev_attr_host_access_count.attr,
&dev_attr_path_masks.attr,
&dev_attr_path_threshold.attr,
&dev_attr_path_autodisable.attr,
&dev_attr_path_interval.attr,
&dev_attr_path_reset.attr,
&dev_attr_hpf.attr,