[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>
diff --git a/arch/s390/include/asm/ccwdev.h b/arch/s390/include/asm/ccwdev.h
index 1c0030f..f3ba0fa 100644
--- a/arch/s390/include/asm/ccwdev.h
+++ b/arch/s390/include/asm/ccwdev.h
@@ -208,6 +208,8 @@
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 *);
diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c
index 407d0e9..4cbb1a6 100644
--- a/drivers/s390/cio/chsc.c
+++ b/drivers/s390/cio/chsc.c
@@ -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 @@
case 0x0007:
case 0x0008:
case 0x000a:
+ case 0x0104:
return -EINVAL;
case 0x0004:
return -EOPNOTSUPP;
@@ -974,3 +976,49 @@
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);
diff --git a/drivers/s390/cio/chsc.h b/drivers/s390/cio/chsc.h
index 37aa611..5453013 100644
--- a/drivers/s390/cio/chsc.h
+++ b/drivers/s390/cio/chsc.h
@@ -80,4 +80,6 @@
int chsc_error_from_response(int response);
+int chsc_siosl(struct subchannel_id schid);
+
#endif
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 6d229f3..75acec3 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -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 @@
}
}
+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(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 @@
}
}
+/**
+ * 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);