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authorSebastian Ott <sebott@de.ibm.com>2008-01-26 16:10:37 +0300
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-01-26 16:10:55 +0300
commit14ff56bbb3422cc465a12e81f5e1b5f06168aeda (patch)
tree3449924a41cce57963c0daf86320be5daf380687 /drivers/s390
parent661ca0da3e1fa60c9e56f995fd83772ffa9ffe90 (diff)
downloadlinux-14ff56bbb3422cc465a12e81f5e1b5f06168aeda.tar.xz
[S390] cio: Dump ccw device information in case of timeout.
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>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/cio/device_fsm.c50
1 files changed, 50 insertions, 0 deletions
diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c
index bfad421cda66..31c0f7885161 100644
--- a/drivers/s390/cio/device_fsm.c
+++ b/drivers/s390/cio/device_fsm.c
@@ -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);
}