[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/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);