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[S390] cio: Dump ccw device information in case of timeout.

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Information about a ccw device will be dumped in
case of a ccw timeout. This can be enabled with
the kernel parameter ccw_timeout_log.

Signed-off-by: Sebastian Ott <sebott@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2008-01-26 14:10:37 +01:00 committed by Martin Schwidefsky
parent 661ca0da3e
commit 14ff56bbb3
3 changed files with 58 additions and 0 deletions
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3
Documentation/kernel-parameters.txt
View file

@ -370,6 +370,9 @@ and is between 256 and 4096 characters. It is defined in the file
configured. Potentially dangerous and should only be
used if you are entirely sure of the consequences.
ccw_timeout_log [S390]
See Documentation/s390/CommonIO for details.
checkreqprot [SELINUX] Set initial checkreqprot flag value.
Format: { "0" | "1" }
See security/selinux/Kconfig help text.

5
Documentation/s390/CommonIO
View file

@ -4,6 +4,11 @@ S/390 common I/O-Layer - command line parameters, procfs and debugfs entries
Command line parameters
-----------------------
* ccw_timeout_log
Enable logging of debug information in case of ccw device timeouts.
* cio_msg = yes | no
Determines whether information on found devices and sensed device

50
drivers/s390/cio/device_fsm.c
View file

@ -25,6 +25,8 @@
#include "ioasm.h"
#include "chp.h"
static int timeout_log_enabled;
int
device_is_online(struct subchannel *sch)
{
@ -82,6 +84,52 @@ int device_trigger_verify(struct subchannel *sch)
return 0;
}
static int __init ccw_timeout_log_setup(char *unused)
{
timeout_log_enabled = 1;
return 1;
}
__setup("ccw_timeout_log", ccw_timeout_log_setup);
static void ccw_timeout_log(struct ccw_device *cdev)
{
struct schib schib;
struct subchannel *sch;
int cc;
sch = to_subchannel(cdev->dev.parent);
cc = stsch(sch->schid, &schib);
printk(KERN_WARNING "cio: ccw device timeout occurred at %llx, "
"device information:\n", get_clock());
printk(KERN_WARNING "cio: orb:\n");
print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
&sch->orb, sizeof(sch->orb), 0);
printk(KERN_WARNING "cio: ccw device bus id: %s\n", cdev->dev.bus_id);
printk(KERN_WARNING "cio: subchannel bus id: %s\n", sch->dev.bus_id);
printk(KERN_WARNING "cio: subchannel lpm: %02x, opm: %02x, "
"vpm: %02x\n", sch->lpm, sch->opm, sch->vpm);
if ((void *)(addr_t)sch->orb.cpa == &sch->sense_ccw ||
(void *)(addr_t)sch->orb.cpa == cdev->private->iccws)
printk(KERN_WARNING "cio: last channel program (intern):\n");
else
printk(KERN_WARNING "cio: last channel program:\n");
print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
(void *)(addr_t)sch->orb.cpa, sizeof(struct ccw1), 0);
printk(KERN_WARNING "cio: ccw device state: %d\n",
cdev->private->state);
printk(KERN_WARNING "cio: store subchannel returned: cc=%d\n", cc);
printk(KERN_WARNING "cio: schib:\n");
print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
&schib, sizeof(schib), 0);
printk(KERN_WARNING "cio: ccw device flags:\n");
print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
&cdev->private->flags, sizeof(cdev->private->flags), 0);
}
/*
* Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
*/
@ -92,6 +140,8 @@ ccw_device_timeout(unsigned long data)
cdev = (struct ccw_device *) data;
spin_lock_irq(cdev->ccwlock);
if (timeout_log_enabled)
ccw_timeout_log(cdev);
dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
spin_unlock_irq(cdev->ccwlock);
}