[S390] cio: I/O subchannel specific fields.

Some fields may be !0 only for I/O subchannels. Add some checks
where required. Also adapt cio_enable_subchannel() to make the
caller specify the intparm, which makes it more generic.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

7 files changed, 42 insertions, 22 deletions

diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c
index 44a2ea40806e..12a344c66b46 100644
--- a/drivers/s390/cio/chsc.c
+++ b/drivers/s390/cio/chsc.c
@@ -89,7 +89,8 @@ int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
         /* Copy data */
         ret = 0;
         memset(ssd, 0, sizeof(struct chsc_ssd_info));
-        if ((ssd_area->st != 0) && (ssd_area->st != 2))
+        if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
+            (ssd_area->st != SUBCHANNEL_TYPE_MSG))
                 goto out_free;
         ssd->path_mask = ssd_area->path_mask;
         ssd->fla_valid_mask = ssd_area->fla_valid_mask;
@@ -158,7 +159,7 @@ s390_subchannel_remove_chpid(struct device *dev, void *data)
         spin_lock_irq(sch->lock);
 
         stsch(sch->schid, &schib);
-        if (!schib.pmcw.dnv)
+        if (!css_sch_is_valid(&schib))
                 goto out_unreg;
         memcpy(&sch->schib, &schib, sizeof(struct schib));
         /* Check for single path devices. */
diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c
index 89ced3408138..f16c15c13f6e 100644
--- a/drivers/s390/cio/cio.c
+++ b/drivers/s390/cio/cio.c
@@ -406,8 +406,8 @@ cio_modify (struct subchannel *sch)
 /*
  * Enable subchannel.
  */
-int
-cio_enable_subchannel (struct subchannel *sch, unsigned int isc)
+int cio_enable_subchannel(struct subchannel *sch, unsigned int isc,
+                          u32 intparm)
 {
         char dbf_txt[15];
         int ccode;
@@ -426,7 +426,7 @@ cio_enable_subchannel (struct subchannel *sch, unsigned int isc)
         for (retry = 5, ret = 0; retry > 0; retry--) {
                 sch->schib.pmcw.ena = 1;
                 sch->schib.pmcw.isc = isc;
-                sch->schib.pmcw.intparm = (u32)(addr_t)sch;
+                sch->schib.pmcw.intparm = intparm;
                 ret = cio_modify(sch);
                 if (ret == -ENODEV)
                         break;
@@ -577,11 +577,8 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
         }
 
         /* Initialization for io subchannels. */
-        if (!sch->schib.pmcw.dnv) {
-                /* io subchannel but device number is invalid. */
-                err = -ENODEV;
-                goto out;
-        }
+        if (!css_sch_is_valid(&sch->schib))
+                return -ENODEV;
         /* Devno is valid. */
         if (is_blacklisted (sch->schid.ssid, sch->schib.pmcw.dev)) {
                 /*
@@ -745,9 +742,9 @@ cio_test_for_console(struct subchannel_id schid, void *data)
 {
         if (stsch_err(schid, &console_subchannel.schib) != 0)
                 return -ENXIO;
-        if (console_subchannel.schib.pmcw.dnv &&
-            console_subchannel.schib.pmcw.dev ==
-            console_devno) {
+        if ((console_subchannel.schib.pmcw.st == SUBCHANNEL_TYPE_IO) &&
+            console_subchannel.schib.pmcw.dnv &&
+            (console_subchannel.schib.pmcw.dev == console_devno)) {
                 console_irq = schid.sch_no;
                 return 1; /* found */
         }
@@ -765,6 +762,7 @@ cio_get_console_sch_no(void)
                 /* VM provided us with the irq number of the console. */
                 schid.sch_no = console_irq;
                 if (stsch(schid, &console_subchannel.schib) != 0 ||
+                    (console_subchannel.schib.pmcw.st != SUBCHANNEL_TYPE_IO) ||
                     !console_subchannel.schib.pmcw.dnv)
                         return -1;
                 console_devno = console_subchannel.schib.pmcw.dev;
@@ -1029,7 +1027,7 @@ static int __reipl_subchannel_match(struct subchannel_id schid, void *data)
 
         if (stsch_reset(schid, &schib))
                 return -ENXIO;
-        if (schib.pmcw.dnv &&
+        if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv &&
             (schib.pmcw.dev == match_id->devid.devno) &&
             (schid.ssid == match_id->devid.ssid)) {
                 match_id->schid = schid;
@@ -1075,6 +1073,8 @@ int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo)
                 return -ENODEV;
         if (stsch(schid, &schib))
                 return -ENODEV;
+        if (schib.pmcw.st != SUBCHANNEL_TYPE_IO)
+                return -ENODEV;
         if (!schib.pmcw.dnv)
                 return -ENODEV;
         iplinfo->devno = schib.pmcw.dev;
diff --git a/drivers/s390/cio/cio.h b/drivers/s390/cio/cio.h
index d1483d65049c..52afa4c784de 100644
--- a/drivers/s390/cio/cio.h
+++ b/drivers/s390/cio/cio.h
@@ -60,7 +60,7 @@ struct subchannel {
         enum {
                 SUBCHANNEL_TYPE_IO = 0,
                 SUBCHANNEL_TYPE_CHSC = 1,
-                SUBCHANNEL_TYPE_MESSAGE = 2,
+                SUBCHANNEL_TYPE_MSG = 2,
                 SUBCHANNEL_TYPE_ADM = 3,
         } st;                   /* subchannel type */
 
@@ -85,7 +85,7 @@ struct subchannel {
 #define to_subchannel(n) container_of(n, struct subchannel, dev)
 
 extern int cio_validate_subchannel (struct subchannel *, struct subchannel_id);
-extern int cio_enable_subchannel (struct subchannel *, unsigned int);
+extern int cio_enable_subchannel(struct subchannel *, unsigned int, u32);
 extern int cio_disable_subchannel (struct subchannel *);
 extern int cio_cancel (struct subchannel *);
 extern int cio_clear (struct subchannel *);
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 2520a44fb93d..4d98a0fddedf 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -237,11 +237,25 @@ get_subchannel_by_schid(struct subchannel_id schid)
         return dev ? to_subchannel(dev) : NULL;
 }
 
+/**
+ * css_sch_is_valid() - check if a subchannel is valid
+ * @schib: subchannel information block for the subchannel
+ */
+int css_sch_is_valid(struct schib *schib)
+{
+        if ((schib->pmcw.st == SUBCHANNEL_TYPE_IO) && !schib->pmcw.dnv)
+                return 0;
+        return 1;
+}
+EXPORT_SYMBOL_GPL(css_sch_is_valid);
+
 static int css_get_subchannel_status(struct subchannel *sch)
 {
         struct schib schib;
 
-        if (stsch(sch->schid, &schib) || !schib.pmcw.dnv)
+        if (stsch(sch->schid, &schib))
+                return CIO_GONE;
+        if (!css_sch_is_valid(&schib))
                 return CIO_GONE;
         if (sch->schib.pmcw.dnv && (schib.pmcw.dev != sch->schib.pmcw.dev))
                 return CIO_REVALIDATE;
@@ -349,7 +363,7 @@ static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow)
                 /* Will be done on the slow path. */
                 return -EAGAIN;
         }
-        if (stsch_err(schid, &schib) || !schib.pmcw.dnv) {
+        if (stsch_err(schid, &schib) || !css_sch_is_valid(&schib)) {
                 /* Unusable - ignore. */
                 return 0;
         }
diff --git a/drivers/s390/cio/css.h b/drivers/s390/cio/css.h
index b2b4a30c285e..ee65761e8254 100644
--- a/drivers/s390/cio/css.h
+++ b/drivers/s390/cio/css.h
@@ -136,6 +136,8 @@ void css_schedule_eval(struct subchannel_id schid);
 void css_schedule_eval_all(void);
 
 int sch_is_pseudo_sch(struct subchannel *);
+struct schib;
+int css_sch_is_valid(struct schib *);
 
 extern struct workqueue_struct *slow_path_wq;
 
diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c
index 44ce7a3d3857..4804d944fb4d 100644
--- a/drivers/s390/cio/device_fsm.c
+++ b/drivers/s390/cio/device_fsm.c
@@ -553,7 +553,8 @@ ccw_device_recognition(struct ccw_device *cdev)
             (cdev->private->state != DEV_STATE_BOXED))
                 return -EINVAL;
         sch = to_subchannel(cdev->dev.parent);
-        ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
+        ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc,
+                                    (u32)(addr_t)sch);
         if (ret != 0)
                 /* Couldn't enable the subchannel for i/o. Sick device. */
                 return ret;
@@ -663,7 +664,8 @@ ccw_device_online(struct ccw_device *cdev)
         sch = to_subchannel(cdev->dev.parent);
         if (css_init_done && !get_device(&cdev->dev))
                 return -ENODEV;
-        ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
+        ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc,
+                                    (u32)(addr_t)sch);
         if (ret != 0) {
                 /* Couldn't enable the subchannel for i/o. Sick device. */
                 if (ret == -ENODEV)
@@ -1043,7 +1045,8 @@ ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
         struct subchannel *sch;
 
         sch = to_subchannel(cdev->dev.parent);
-        if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
+        if (cio_enable_subchannel(sch, sch->schib.pmcw.isc,
+                                  (u32)(addr_t)sch) != 0)
                 /* Couldn't enable the subchannel for i/o. Sick device. */
                 return;
 
diff --git a/drivers/s390/cio/device_ops.c b/drivers/s390/cio/device_ops.c
index 7fd2dadc3297..49b58eb0fab8 100644
--- a/drivers/s390/cio/device_ops.c
+++ b/drivers/s390/cio/device_ops.c
@@ -501,7 +501,7 @@ ccw_device_stlck(struct ccw_device *cdev)
                 return -ENOMEM;
         }
         spin_lock_irqsave(sch->lock, flags);
-        ret = cio_enable_subchannel(sch, 3);
+        ret = cio_enable_subchannel(sch, 3, (u32)(addr_t)sch);
         if (ret)
                 goto out_unlock;
         /*