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authorHeiko Carstens <heiko.carstens@de.ibm.com>2007-04-27 16:01:56 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2007-04-27 16:01:46 +0200
commit2fc2d1e9ffcde78af7ab63ed640d9a4901797de2 (patch)
tree9fd8fcbf4b6882200480da1f04e30b406d1f8a57 /drivers/s390/sysinfo.c
parentdb77aa5f3d01fe6a6cc629dbd37936b1fdd129ba (diff)
[S390] Processor degradation notification.
Generate uevents for all cpus if cpu capability changes. This can happen e.g. because the cpus are overheating. The cpu capability can be read via /sys/devices/system/cpu/cpuN/capability. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Diffstat (limited to 'drivers/s390/sysinfo.c')
-rw-r--r--drivers/s390/sysinfo.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/s390/sysinfo.c b/drivers/s390/sysinfo.c
index 090743d2f91..19343f9675c 100644
--- a/drivers/s390/sysinfo.c
+++ b/drivers/s390/sysinfo.c
@@ -357,6 +357,24 @@ static __init int create_proc_sysinfo(void)
__initcall(create_proc_sysinfo);
+int get_cpu_capability(unsigned int *capability)
+{
+ struct sysinfo_1_2_2 *info;
+ int rc;
+
+ info = (void *) get_zeroed_page(GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+ rc = stsi(info, 1, 2, 2);
+ if (rc == -ENOSYS)
+ goto out;
+ rc = 0;
+ *capability = info->capability;
+out:
+ free_page((unsigned long) info);
+ return rc;
+}
+
/*
* CPU capability might have changed. Therefore recalculate loops_per_jiffy.
*/