[PATCH] s390: multiple subchannel sets support

Add support for multiple subchannel sets.  Works with arbitrary devices in
subchannel set 1 and is transparent to device drivers.  Although currently
only two subchannel sets are available, this will work with the architectured
maximum number of subchannel sets as well.

Signed-off-by: Cornelia Huck <cohuck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 21 insertions, 14 deletions

diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c
index 3eb6cb608fc9..6f274f4f92eb 100644
--- a/drivers/s390/cio/cio.c
+++ b/drivers/s390/cio/cio.c
@@ -1,7 +1,7 @@
 /*
  *  drivers/s390/cio/cio.c
  *   S/390 common I/O routines -- low level i/o calls
- *   $Revision: 1.135 $
+ *   $Revision: 1.138 $
  *
  *    Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH,
  *                            IBM Corporation
@@ -166,7 +166,8 @@ cio_start_handle_notoper(struct subchannel *sch, __u8 lpm)
         stsch (sch->schid, &sch->schib);
 
         CIO_MSG_EVENT(0, "cio_start: 'not oper' status for "
-                      "subchannel %04x!\n", sch->schid.sch_no);
+                      "subchannel 0.%x.%04x!\n", sch->schid.ssid,
+                      sch->schid.sch_no);
         sprintf(dbf_text, "no%s", sch->dev.bus_id);
         CIO_TRACE_EVENT(0, dbf_text);
         CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib));
@@ -522,15 +523,18 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
         spin_lock_init(&sch->lock);
 
         /* Set a name for the subchannel */
-        snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.0.%04x", schid.sch_no);
+        snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", schid.ssid,
+                  schid.sch_no);
 
         /*
          * The first subchannel that is not-operational (ccode==3)
          *  indicates that there aren't any more devices available.
+         * If stsch gets an exception, it means the current subchannel set
+         *  is not valid.
          */
-        ccode = stsch (schid, &sch->schib);
+        ccode = stsch_err (schid, &sch->schib);
         if (ccode)
-                return -ENXIO;
+                return (ccode == 3) ? -ENXIO : ccode;
 
         sch->schid = schid;
         /* Copy subchannel type from path management control word. */
@@ -541,9 +545,9 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
          */
         if (sch->st != 0) {
                 CIO_DEBUG(KERN_INFO, 0,
-                          "Subchannel %04X reports "
+                          "Subchannel 0.%x.%04x reports "
                           "non-I/O subchannel type %04X\n",
-                          sch->schid.sch_no, sch->st);
+                          sch->schid.ssid, sch->schid.sch_no, sch->st);
                 /* We stop here for non-io subchannels. */
                 return sch->st;
         }
@@ -554,26 +558,29 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
                 return -ENODEV;
 
         /* Devno is valid. */
-        if (is_blacklisted (sch->schib.pmcw.dev)) {
+        if (is_blacklisted (sch->schid.ssid, sch->schib.pmcw.dev)) {
                 /*
                  * This device must not be known to Linux. So we simply
                  * say that there is no device and return ENODEV.
                  */
                 CIO_MSG_EVENT(0, "Blacklisted device detected "
-                              "at devno %04X\n", sch->schib.pmcw.dev);
+                              "at devno %04X, subchannel set %x\n",
+                              sch->schib.pmcw.dev, sch->schid.ssid);
                 return -ENODEV;
         }
         sch->opm = 0xff;
-        chsc_validate_chpids(sch);
+        if (!cio_is_console(sch->schid))
+                chsc_validate_chpids(sch);
         sch->lpm = sch->schib.pmcw.pim &
                 sch->schib.pmcw.pam &
                 sch->schib.pmcw.pom &
                 sch->opm;
 
         CIO_DEBUG(KERN_INFO, 0,
-                  "Detected device %04X on subchannel %04X"
+                  "Detected device %04x on subchannel 0.%x.%04X"
                   " - PIM = %02X, PAM = %02X, POM = %02X\n",
-                  sch->schib.pmcw.dev, sch->schid.sch_no, sch->schib.pmcw.pim,
+                  sch->schib.pmcw.dev, sch->schid.ssid,
+                  sch->schid.sch_no, sch->schib.pmcw.pim,
                   sch->schib.pmcw.pam, sch->schib.pmcw.pom);
 
         /*
@@ -693,7 +700,7 @@ wait_cons_dev (void)
 static int
 cio_test_for_console(struct subchannel_id schid, void *data)
 {
-        if (stsch(schid, &console_subchannel.schib) != 0)
+        if (stsch_err(schid, &console_subchannel.schib) != 0)
                 return -ENXIO;
         if (console_subchannel.schib.pmcw.dnv &&
             console_subchannel.schib.pmcw.dev ==
@@ -841,7 +848,7 @@ __shutdown_subchannel_easy(struct subchannel_id schid, void *data)
 {
         struct schib schib;
 
-        if (stsch(schid, &schib))
+        if (stsch_err(schid, &schib))
                 return -ENXIO;
         if (!schib.pmcw.ena)
                 return 0;