[patch 1/8] Processor degredation support.

Heiko Carstens
2007-03-26T21:26:41Z

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From: Heiko Carstens <heiko.carstens@de.ibm.com>

Emit a warning if cpu capability changes e.g. because the cpus are
overheating. The new cpu capability can be read via /proc/sysinfo.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
---

drivers/s390/char/Makefile | 2 -
drivers/s390/char/sclp.h | 2 +
drivers/s390/char/sclp_confmgm.c | 57 +++++++++++++++++++++++++++++++++++++++
3 files changed, 60 insertions(+), 1 deletion(-)

Index: linux-2.6/drivers/s390/char/Makefile
===================================================================
--- linux-2.6.orig/drivers/s390/char/Makefile
+++ linux-2.6/drivers/s390/char/Makefile
@@ -3,7 +3,7 @@
#

obj-y += ctrlchar.o keyboard.o defkeymap.o sclp.o sclp_rw.o sclp_quiesce.o \
- sclp_info.o
+ sclp_info.o sclp_confmgm.o

obj-$(CONFIG_TN3270) += raw3270.o
obj-$(CONFIG_TN3270_CONSOLE) += con3270.o
Index: linux-2.6/drivers/s390/char/sclp_confmgm.c
===================================================================
--- /dev/null
+++ linux-2.6/drivers/s390/char/sclp_confmgm.c
@@ -0,0 +1,57 @@
+/*
+ * drivers/s390/char/sclp_confmgm.c
+ *
+ * Copyright IBM Corp. 2007
+ * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
+ */
+
+#include <linux/init.h>
+#include <linux/errno.h>
+#include "sclp.h"
+
+#define SCLP_CONFMGM_PRINT_HEADER "sclp_confmgm: "
+
+struct conf_mgm_data {
+ u8 reserved;
+ u8 ev_qualifier;
+} __attribute__((packed));
+
+#define EV_QUAL_CAP_CHANGE 3
+
+static void sclp_conf_receiver_fn(struct evbuf_header *evbuf)
+{
+ struct conf_mgm_data *cdata;
+
+ cdata = (struct conf_mgm_data *)(evbuf + 1);
+ if (cdata->ev_qualifier == EV_QUAL_CAP_CHANGE)
+ /* Will be parsed. Don't change. */
+ printk(KERN_WARNING "sclp: CPU capability changed.\n");
+}
+
+static struct sclp_register sclp_conf_register =
+{
+ .receive_mask = EvTyp_ConfMgmData_Mask,
+ .receiver_fn = sclp_conf_receiver_fn,
+};
+
+static int __init sclp_conf_init(void)
+{
+ int rc;
+
+ rc = sclp_register(&sclp_conf_register);
+ if (rc) {
+ printk(KERN_ERR SCLP_CONFMGM_PRINT_HEADER
+ "failed to register (%d).\n", rc);
+ return rc;
+ }
+
+ if (!(sclp_conf_register.sclp_receive_mask & EvTyp_ConfMgmData_Mask)) {
+ printk(KERN_WARNING SCLP_CONFMGM_PRINT_HEADER
+ "no configuration management.\n");
+ sclp_unregister(&sclp_conf_register);
+ rc = -ENOSYS;
+ }
+ return rc;
+}
+
+__initcall(sclp_conf_init);
Index: linux-2.6/drivers/s390/char/sclp.h
===================================================================
--- linux-2.6.orig/drivers/s390/char/sclp.h
+++ linux-2.6/drivers/s390/char/sclp.h
@@ -27,6 +27,7 @@
#define EvTyp_CntlProgIdent 0x0B
#define EvTyp_SigQuiesce 0x1D
#define EvTyp_VT220Msg 0x1A
+#define EvTyp_ConfMgmData 0x04

#define EvTyp_OpCmd_Mask 0x80000000
#define EvTyp_Msg_Mask 0x40000000
@@ -36,6 +37,7 @@
#define EvTyp_CtlProgIdent_Mask 0x00200000
#define EvTyp_SigQuiesce_Mask 0x00000008
#define EvTyp_VT220Msg_Mask 0x00000040
+#define EvTyp_ConfMgmData_Mask 0x10000000

#define GnrlMsgFlgs_DOM 0x8000
#define GnrlMsgFlgs_SndAlrm 0x4000

--