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[S390] cio: introduce purge function for /proc/cio_ignore 

Allow users to remove blacklisted ccw devices by using the
/proc/cio_ignore interface:

  echo purge > /proc/cio_ignore

will remove all devices which are offline and blacklisted.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Peter Oberparleiter 2008-10-10 21:33:06 +02:00 committed by Martin Schwidefsky
parent 46fbe4e46d
commit ecf5d9ef68
3 changed files with 48 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/s390/cio/blacklist.c
View File

@ -24,6 +24,7 @@
#include "cio.h"
#include "cio_debug.h"
#include "css.h"
#include "device.h"
/*
* "Blacklisting" of certain devices:
@ -191,9 +192,9 @@ static int blacklist_parse_parameters(char *str, range_action action,
rc = blacklist_range(ra, from_ssid, to_ssid, from, to,
msgtrigger);
if (rc)
totalrc = 1;
totalrc = -EINVAL;
} else
totalrc = 1;
totalrc = -EINVAL;
}
return totalrc;
@ -240,8 +241,10 @@ static int blacklist_parse_proc_parameters(char *buf)
rc = blacklist_parse_parameters(buf, free, 0);
else if (strcmp("add", parm) == 0)
rc = blacklist_parse_parameters(buf, add, 0);
else if (strcmp("purge", parm) == 0)
return ccw_purge_blacklisted();
else
return 1;
return -EINVAL;
css_schedule_reprobe();
@ -353,7 +356,7 @@ cio_ignore_write(struct file *file, const char __user *user_buf,
}
ret = blacklist_parse_proc_parameters(buf);
if (ret)
rc = -EINVAL;
rc = ret;
else
rc = user_len;

40
drivers/s390/cio/device.c
View File

@ -31,6 +31,7 @@
#include "device.h"
#include "ioasm.h"
#include "io_sch.h"
#include "blacklist.h"
static struct timer_list recovery_timer;
static DEFINE_SPINLOCK(recovery_lock);
@ -1470,6 +1471,45 @@ static void ccw_device_schedule_recovery(void)
spin_unlock_irqrestore(&recovery_lock, flags);
}
static int purge_fn(struct device *dev, void *data)
{
struct ccw_device *cdev = to_ccwdev(dev);
struct ccw_device_private *priv = cdev->private;
int unreg;
spin_lock_irq(cdev->ccwlock);
unreg = is_blacklisted(priv->dev_id.ssid, priv->dev_id.devno) &&
(priv->state == DEV_STATE_OFFLINE);
spin_unlock_irq(cdev->ccwlock);
if (!unreg)
goto out;
if (!get_device(&cdev->dev))
goto out;
CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", priv->dev_id.ssid,
priv->dev_id.devno);
PREPARE_WORK(&cdev->private->kick_work, ccw_device_call_sch_unregister);
queue_work(slow_path_wq, &cdev->private->kick_work);
out:
/* Abort loop in case of pending signal. */
if (signal_pending(current))
return -EINTR;
return 0;
}
/**
* ccw_purge_blacklisted - purge unused, blacklisted devices
*
* Unregister all ccw devices that are offline and on the blacklist.
*/
int ccw_purge_blacklisted(void)
{
CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n");
bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn);
return 0;
}
static void device_set_disconnected(struct ccw_device *cdev)
{
if (!cdev)

1
drivers/s390/cio/device.h
View File

@ -86,6 +86,7 @@ int ccw_device_is_orphan(struct ccw_device *);
int ccw_device_recognition(struct ccw_device *);
int ccw_device_online(struct ccw_device *);
int ccw_device_offline(struct ccw_device *);
int ccw_purge_blacklisted(void);
/* Function prototypes for device status and basic sense stuff. */
void ccw_device_accumulate_irb(struct ccw_device *, struct irb *);