Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 14ff56bb authored by Sebastian Ott's avatar Sebastian Ott Committed by Martin Schwidefsky
Browse files

[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: default avatarSebastian Ott <sebott@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 661ca0da

Documentation/kernel-parameters.txt

+3 −0
Original line number Diff line number Diff line
@@ -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.

Documentation/s390/CommonIO

+5 −0
Original line number Diff line number Diff line
@@ -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

drivers/s390/cio/device_fsm.c

+50 −0
Original line number Diff line number Diff line
@@ -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);

}