s390/cio: add ipldev keyword to cio_ignore

Provide an 'ipldev' keyword to cio_ignore to (un)ignore the
CCW or FCP based boot device.

Reviewed-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

2 files changed, 26 insertions, 8 deletions

diff --git a/Documentation/s390/CommonIO b/Documentation/s390/CommonIO
index d378cba66456..d90a5ddb2b07 100644
--- a/Documentation/s390/CommonIO
+++ b/Documentation/s390/CommonIO
@@ -8,9 +8,9 @@ Command line parameters
 
   Enable logging of debug information in case of ccw device timeouts.
 
-* cio_ignore = {all} |
-               {<device> | <range of devices>} |
-               {!<device> | !<range of devices>}
+* cio_ignore = device[,device[,..]]
+
+        device := {all | [!]ipldev | [!]<devno> | [!]<devno>-<devno>}
 
   The given devices will be ignored by the common I/O-layer; no detection
   and device sensing will be done on any of those devices. The subchannel to 
@@ -24,9 +24,10 @@ Command line parameters
   device numbers (0xabcd or abcd, for 2.4 backward compatibility). If you
   give a device number 0xabcd, it will be interpreted as 0.0.abcd.
 
-  You can use the 'all' keyword to ignore all devices.
-  The '!' operator will cause the I/O-layer to _not_ ignore a device.
-  The command line is parsed from left to right.
+  You can use the 'all' keyword to ignore all devices. The 'ipldev' keyword can
+  be used to refer to the CCW based boot device (this is probably useful only
+  when combined with the '!' operator). The '!' operator will cause the I/O-layer
+  to _not_ ignore a device. The command line is parsed from left to right.
 
   For example, 
         cio_ignore=0.0.0023-0.0.0042,0.0.4711
diff --git a/drivers/s390/cio/blacklist.c b/drivers/s390/cio/blacklist.c
index 2d2a966a3b39..706eb9b6513f 100644
--- a/drivers/s390/cio/blacklist.c
+++ b/drivers/s390/cio/blacklist.c
@@ -1,7 +1,7 @@
 /*
  *   S/390 common I/O routines -- blacklisting of specific devices
  *
- *    Copyright IBM Corp. 1999, 2002
+ *    Copyright IBM Corp. 1999, 2013
  *    Author(s): Ingo Adlung (adlung@de.ibm.com)
  *               Cornelia Huck (cornelia.huck@de.ibm.com)
  *               Arnd Bergmann (arndb@de.ibm.com)
@@ -17,8 +17,9 @@
 #include <linux/ctype.h>
 #include <linux/device.h>
 
-#include <asm/cio.h>
 #include <asm/uaccess.h>
+#include <asm/cio.h>
+#include <asm/ipl.h>
 
 #include "blacklist.h"
 #include "cio.h"
@@ -172,6 +173,22 @@ static int blacklist_parse_parameters(char *str, range_action action,
                         to_cssid = __MAX_CSSID;
                         to_ssid = __MAX_SSID;
                         to = __MAX_SUBCHANNEL;
+                } else if (strcmp(parm, "ipldev") == 0) {
+                        if (ipl_info.type == IPL_TYPE_CCW) {
+                                from_cssid = 0;
+                                from_ssid = ipl_info.data.ccw.dev_id.ssid;
+                                from = ipl_info.data.ccw.dev_id.devno;
+                        } else if (ipl_info.type == IPL_TYPE_FCP ||
+                                   ipl_info.type == IPL_TYPE_FCP_DUMP) {
+                                from_cssid = 0;
+                                from_ssid = ipl_info.data.fcp.dev_id.ssid;
+                                from = ipl_info.data.fcp.dev_id.devno;
+                        } else {
+                                continue;
+                        }
+                        to_cssid = from_cssid;
+                        to_ssid = from_ssid;
+                        to = from;
                 } else {
                         rc = parse_busid(strsep(&parm, "-"), &from_cssid,
                                          &from_ssid, &from, msgtrigger);