[S390] cio: add message for timeouts on internal I/O

Print a message in case we do not receive an IRQ in time (for internal
I/O). Also print the ID of the last used channel path, since it is
possible that not the device itself but this specific path might have
a defect.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 20 insertions, 3 deletions

diff --git a/drivers/s390/cio/ccwreq.c b/drivers/s390/cio/ccwreq.c
index d15f8b4d78b..5156264d0c7 100644
--- a/drivers/s390/cio/ccwreq.c
+++ b/drivers/s390/cio/ccwreq.c
@@ -1,10 +1,13 @@
 /*
  *  Handling of internal CCW device requests.
  *
- *    Copyright IBM Corp. 2009
+ *    Copyright IBM Corp. 2009, 2011
  *    Author(s): Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
  */
 
+#define KMSG_COMPONENT "cio"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
 #include <linux/types.h>
 #include <linux/err.h>
 #include <asm/ccwdev.h>
@@ -323,7 +326,21 @@ void ccw_request_timeout(struct ccw_device *cdev)
 {
         struct subchannel *sch = to_subchannel(cdev->dev.parent);
         struct ccw_request *req = &cdev->private->req;
-        int rc;
+        int rc = -ENODEV, chp;
+
+        if (cio_update_schib(sch))
+                goto err;
+
+        for (chp = 0; chp < 8; chp++) {
+                if ((0x80 >> chp) & sch->schib.pmcw.lpum)
+                        pr_warning("%s: No interrupt was received within %lus "
+                                   "(CS=%02x, DS=%02x, CHPID=%x.%02x)\n",
+                                   dev_name(&cdev->dev), req->timeout / HZ,
+                                   scsw_cstat(&sch->schib.scsw),
+                                   scsw_dstat(&sch->schib.scsw),
+                                   sch->schid.cssid,
+                                   sch->schib.pmcw.chpid[chp]);
+        }
 
         if (!ccwreq_next_path(cdev)) {
                 /* set the final return code for this request */
@@ -342,7 +359,7 @@ err:
  * ccw_request_notoper - notoper handler for I/O request procedure
  * @cdev: ccw device
  *
- * Handle timeout during I/O request procedure.
+ * Handle notoper during I/O request procedure.
  */
 void ccw_request_notoper(struct ccw_device *cdev)
 {