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author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2007-04-27 16:01:56 +0200 |
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committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2007-04-27 16:01:46 +0200 |
commit | 2fc2d1e9ffcde78af7ab63ed640d9a4901797de2 (patch) | |
tree | 9fd8fcbf4b6882200480da1f04e30b406d1f8a57 /arch/s390 | |
parent | db77aa5f3d01fe6a6cc629dbd37936b1fdd129ba (diff) | |
download | kernel_samsung_tuna-2fc2d1e9ffcde78af7ab63ed640d9a4901797de2.zip kernel_samsung_tuna-2fc2d1e9ffcde78af7ab63ed640d9a4901797de2.tar.gz kernel_samsung_tuna-2fc2d1e9ffcde78af7ab63ed640d9a4901797de2.tar.bz2 |
[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 'arch/s390')
-rw-r--r-- | arch/s390/kernel/smp.c | 48 |
1 files changed, 43 insertions, 5 deletions
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index 7c0143f..2c5de92 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -821,19 +821,57 @@ int setup_profiling_timer(unsigned int multiplier) static DEFINE_PER_CPU(struct cpu, cpu_devices); +static ssize_t show_capability(struct sys_device *dev, char *buf) +{ + unsigned int capability; + int rc; + + rc = get_cpu_capability(&capability); + if (rc) + return rc; + return sprintf(buf, "%u\n", capability); +} +static SYSDEV_ATTR(capability, 0444, show_capability, NULL); + +static int __cpuinit smp_cpu_notify(struct notifier_block *self, + unsigned long action, void *hcpu) +{ + unsigned int cpu = (unsigned int)(long)hcpu; + struct cpu *c = &per_cpu(cpu_devices, cpu); + struct sys_device *s = &c->sysdev; + + switch (action) { + case CPU_ONLINE: + if (sysdev_create_file(s, &attr_capability)) + return NOTIFY_BAD; + break; + case CPU_DEAD: + sysdev_remove_file(s, &attr_capability); + break; + } + return NOTIFY_OK; +} + +static struct notifier_block __cpuinitdata smp_cpu_nb = { + .notifier_call = smp_cpu_notify, +}; + static int __init topology_init(void) { int cpu; - int ret; + + register_cpu_notifier(&smp_cpu_nb); for_each_possible_cpu(cpu) { struct cpu *c = &per_cpu(cpu_devices, cpu); + struct sys_device *s = &c->sysdev; c->hotpluggable = 1; - ret = register_cpu(c, cpu); - if (ret) - printk(KERN_WARNING "topology_init: register_cpu %d " - "failed (%d)\n", cpu, ret); + register_cpu(c, cpu); + if (!cpu_online(cpu)) + continue; + s = &c->sysdev; + sysdev_create_file(s, &attr_capability); } return 0; } |