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powercap/intel rapl: Convert to hotplug state machine

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Install the callbacks via the state machine as a first step. The init/exit
code is a duplicate of the hotplug code. This is cleaned up in a
consecutive patch.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Sebastian Andrzej Siewior 2016-11-22 21:16:00 +00:00 committed by Rafael J. Wysocki
parent a74f436757
commit 5e4dc79159
1 changed files with 49 additions and 45 deletions
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94
drivers/powercap/intel_rapl.c
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@ -1603,50 +1603,48 @@ static int rapl_add_package(int cpu)
* associated domains. Cooling devices are handled accordingly at
* per-domain level.
*/
static int rapl_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
static int rapl_cpu_online(unsigned int cpu)
{
struct rapl_package *rp;
int phy_package_id;
phy_package_id = topology_physical_package_id(cpu);
rp = find_package_by_id(phy_package_id);
if (rp)
rp->nr_cpus++;
else
rapl_add_package(cpu);
return 0;
}
static int rapl_cpu_down_prep(unsigned int cpu)
{
unsigned long cpu = (unsigned long)hcpu;
int phy_package_id;
struct rapl_package *rp;
int lead_cpu;
phy_package_id = topology_physical_package_id(cpu);
switch (action) {
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
case CPU_DOWN_FAILED:
case CPU_DOWN_FAILED_FROZEN:
rp = find_package_by_id(phy_package_id);
if (rp)
++rp->nr_cpus;
else
rapl_add_package(cpu);
break;
case CPU_DOWN_PREPARE:
case CPU_DOWN_PREPARE_FROZEN:
rp = find_package_by_id(phy_package_id);
if (!rp)
break;
if (--rp->nr_cpus == 0)
rapl_remove_package(rp);
else if (cpu == rp->lead_cpu) {
/* choose another active cpu in the package */
lead_cpu = cpumask_any_but(topology_core_cpumask(cpu), cpu);
if (lead_cpu < nr_cpu_ids)
rp->lead_cpu = lead_cpu;
else /* should never go here */
pr_err("no active cpu available for package %d\n",
phy_package_id);
rp = find_package_by_id(phy_package_id);
if (!rp)
return 0;
if (--rp->nr_cpus == 0) {
rapl_remove_package(rp);
} else if (cpu == rp->lead_cpu) {
/* choose another active cpu in the package */
lead_cpu = cpumask_any_but(topology_core_cpumask(cpu), cpu);
if (lead_cpu < nr_cpu_ids) {
rp->lead_cpu = lead_cpu;
} else {
/* should never go here */
pr_err("no active cpu available for package %d\n",
phy_package_id);
}
}
return NOTIFY_OK;
return 0;
}
static struct notifier_block rapl_cpu_notifier = {
.notifier_call = rapl_cpu_callback,
};
static enum cpuhp_state pcap_rapl_online;
static int __init rapl_init(void)
{
@ -1663,36 +1661,42 @@ static int __init rapl_init(void)
rapl_defaults = (struct rapl_defaults *)id->driver_data;
cpu_notifier_register_begin();
/* prevent CPU hotplug during detection */
get_online_cpus();
ret = rapl_detect_topology();
if (ret)
goto done;
goto err;
if (rapl_register_powercap()) {
rapl_cleanup_data();
ret = -ENODEV;
goto done;
goto err_cleanup;
}
__register_hotcpu_notifier(&rapl_cpu_notifier);
done:
ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
"powercap/rapl:online",
rapl_cpu_online, rapl_cpu_down_prep);
if (ret < 0)
goto err_unreg;
pcap_rapl_online = ret;
put_online_cpus();
cpu_notifier_register_done();
return 0;
err_unreg:
rapl_unregister_powercap();
err_cleanup:
rapl_cleanup_data();
err:
put_online_cpus();
return ret;
}
static void __exit rapl_exit(void)
{
cpu_notifier_register_begin();
get_online_cpus();
__unregister_hotcpu_notifier(&rapl_cpu_notifier);
cpuhp_remove_state(pcap_rapl_online);
rapl_unregister_powercap();
rapl_cleanup_data();
put_online_cpus();
cpu_notifier_register_done();
}
module_init(rapl_init);