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[S390] cio: CHSC SIOSL Support 

A Linux interface for the CHSC command
store-I/O-operation-status-and-initiate-logging (SIOSL).
Model-dependent logging within the channel subsystem can be invoked
via a helper function or a writable subchannel device attribute.

Signed-off-by: Michael Ernst <mernst@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Michael Ernst 2010-08-09 18:12:50 +02:00 committed by Martin Schwidefsky
parent 45d7f32c7a
commit fd0457a6ae
4 changed files with 89 additions and 0 deletions
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2
arch/s390/include/asm/ccwdev.h
View File

@ -208,6 +208,8 @@ extern void ccw_device_get_id(struct ccw_device *, struct ccw_dev_id *);
extern struct ccw_device *ccw_device_probe_console(void);
extern int ccw_device_force_console(void);
int ccw_device_siosl(struct ccw_device *);
// FIXME: these have to go
extern int _ccw_device_get_subchannel_number(struct ccw_device *);

48
drivers/s390/cio/chsc.c
View File

@ -29,6 +29,7 @@
#include "chsc.h"
static void *sei_page;
static DEFINE_SPINLOCK(siosl_lock);
static DEFINE_SPINLOCK(sda_lock);
/**
@ -48,6 +49,7 @@ int chsc_error_from_response(int response)
case 0x0007:
case 0x0008:
case 0x000a:
case 0x0104:
return -EINVAL;
case 0x0004:
return -EOPNOTSUPP;
@ -974,3 +976,49 @@ int chsc_sstpi(void *page, void *result, size_t size)
return (rr->response.code == 0x0001) ? 0 : -EIO;
}
static struct {
struct chsc_header request;
u32 word1;
struct subchannel_id sid;
u32 word3;
struct chsc_header response;
u32 word[11];
} __attribute__ ((packed)) siosl_area __attribute__ ((__aligned__(PAGE_SIZE)));
int chsc_siosl(struct subchannel_id schid)
{
unsigned long flags;
int ccode;
int rc;
spin_lock_irqsave(&siosl_lock, flags);
memset(&siosl_area, 0, sizeof(siosl_area));
siosl_area.request.length = 0x0010;
siosl_area.request.code = 0x0046;
siosl_area.word1 = 0x80000000;
siosl_area.sid = schid;
ccode = chsc(&siosl_area);
if (ccode > 0) {
if (ccode == 3)
rc = -ENODEV;
else
rc = -EBUSY;
CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
schid.ssid, schid.sch_no, ccode);
goto out;
}
rc = chsc_error_from_response(siosl_area.response.code);
if (rc)
CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
schid.ssid, schid.sch_no,
siosl_area.response.code);
else
CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
schid.ssid, schid.sch_no);
out:
spin_unlock_irqrestore(&siosl_lock, flags);
return rc;
}
EXPORT_SYMBOL_GPL(chsc_siosl);

2
drivers/s390/cio/chsc.h
View File

@ -80,4 +80,6 @@ int chsc_get_channel_measurement_chars(struct channel_path *chp);
int chsc_error_from_response(int response);
int chsc_siosl(struct subchannel_id schid);
#endif

37
drivers/s390/cio/device.c
View File

@ -36,6 +36,7 @@
#include "ioasm.h"
#include "io_sch.h"
#include "blacklist.h"
#include "chsc.h"
static struct timer_list recovery_timer;
static DEFINE_SPINLOCK(recovery_lock);
@ -598,6 +599,25 @@ available_show (struct device *dev, struct device_attribute *attr, char *buf)
}
}
static ssize_t
initiate_logging(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct subchannel *sch = to_subchannel(dev);
int rc;
rc = chsc_siosl(sch->schid);
if (rc < 0) {
pr_warning("Logging for subchannel 0.%x.%04x failed with "
"errno=%d\n",
sch->schid.ssid, sch->schid.sch_no, rc);
return rc;
}
pr_notice("Logging for subchannel 0.%x.%04x was triggered\n",
sch->schid.ssid, sch->schid.sch_no);
return count;
}
static DEVICE_ATTR(chpids, 0444, chpids_show, NULL);
static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL);
static DEVICE_ATTR(devtype, 0444, devtype_show, NULL);
@ -605,10 +625,12 @@ static DEVICE_ATTR(cutype, 0444, cutype_show, NULL);
static DEVICE_ATTR(modalias, 0444, modalias_show, NULL);
static DEVICE_ATTR(online, 0644, online_show, online_store);
static DEVICE_ATTR(availability, 0444, available_show, NULL);
static DEVICE_ATTR(logging, 0200, NULL, initiate_logging);
static struct attribute *io_subchannel_attrs[] = {
&dev_attr_chpids.attr,
&dev_attr_pimpampom.attr,
&dev_attr_logging.attr,
NULL,
};
@ -2036,6 +2058,21 @@ void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo)
}
}
/**
* ccw_device_siosl() - initiate logging
* @cdev: ccw device
*
* This function is used to invoke model-dependent logging within the channel
* subsystem.
*/
int ccw_device_siosl(struct ccw_device *cdev)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
return chsc_siosl(sch->schid);
}
EXPORT_SYMBOL_GPL(ccw_device_siosl);
MODULE_LICENSE("GPL");
EXPORT_SYMBOL(ccw_device_set_online);
EXPORT_SYMBOL(ccw_device_set_offline);