[S390] ipl/dump on panic.
It is now possible to specify a ccw/fcp dump device which is used to
automatically create a system dump in case of a kernel panic. The dump
device can be configured under /sys/firmware/dump.
In addition it is now possible to specify a ccw/fcp device which is used
for the next reboot of Linux. The reipl device can be configured under
/sys/firmware/reipl.
Signed-off-by: Michael Holzheu <holzheu@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c
index 89320c1..050963f 100644
--- a/drivers/s390/cio/cio.c
+++ b/drivers/s390/cio/cio.c
@@ -841,14 +841,26 @@
return -EBUSY;
}
-extern void do_reipl(unsigned long devno);
-static int
-__shutdown_subchannel_easy(struct subchannel_id schid, void *data)
+struct sch_match_id {
+ struct subchannel_id schid;
+ struct ccw_dev_id devid;
+ int rc;
+};
+
+static int __shutdown_subchannel_easy_and_match(struct subchannel_id schid,
+ void *data)
{
struct schib schib;
+ struct sch_match_id *match_id = data;
if (stsch_err(schid, &schib))
return -ENXIO;
+ if (match_id && schib.pmcw.dnv &&
+ (schib.pmcw.dev == match_id->devid.devno) &&
+ (schid.ssid == match_id->devid.ssid)) {
+ match_id->schid = schid;
+ match_id->rc = 0;
+ }
if (!schib.pmcw.ena)
return 0;
switch(__disable_subchannel_easy(schid, &schib)) {
@@ -864,18 +876,36 @@
return 0;
}
-void
-clear_all_subchannels(void)
+static int clear_all_subchannels_and_match(struct ccw_dev_id *devid,
+ struct subchannel_id *schid)
{
+ struct sch_match_id match_id;
+
+ match_id.devid = *devid;
+ match_id.rc = -ENODEV;
local_irq_disable();
- for_each_subchannel(__shutdown_subchannel_easy, NULL);
+ for_each_subchannel(__shutdown_subchannel_easy_and_match, &match_id);
+ if (match_id.rc == 0)
+ *schid = match_id.schid;
+ return match_id.rc;
}
-/* Make sure all subchannels are quiet before we re-ipl an lpar. */
-void
-reipl(unsigned long devno)
+
+void clear_all_subchannels(void)
{
- clear_all_subchannels();
+ local_irq_disable();
+ for_each_subchannel(__shutdown_subchannel_easy_and_match, NULL);
+}
+
+extern void do_reipl_asm(__u32 schid);
+
+/* Make sure all subchannels are quiet before we re-ipl an lpar. */
+void reipl_ccw_dev(struct ccw_dev_id *devid)
+{
+ struct subchannel_id schid;
+
+ if (clear_all_subchannels_and_match(devid, &schid))
+ panic("IPL Device not found\n");
cio_reset_channel_paths();
- do_reipl(devno);
+ do_reipl_asm(*((__u32*)&schid));
}