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Commit fd0457a6 authored by Michael Ernst's avatar Michael Ernst Committed by Martin Schwidefsky
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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: default avatarMichael Ernst <mernst@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 45d7f32c

arch/s390/include/asm/ccwdev.h

+2 −0
Original line number Diff line number Diff line
@@ -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 *);

drivers/s390/cio/chsc.c

+48 −0
Original line number Diff line number Diff line
@@ -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);

drivers/s390/cio/chsc.h

+2 −0
Original line number Diff line number Diff line
@@ -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

drivers/s390/cio/device.c

+37 −0
Original line number Diff line number Diff line
@@ -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);