[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>
diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c
index 3eb6cb6..6f274f4 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 @@
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 @@
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 @@
*/
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 @@
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 @@
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 @@
{
struct schib schib;
- if (stsch(schid, &schib))
+ if (stsch_err(schid, &schib))
return -ENXIO;
if (!schib.pmcw.ena)
return 0;