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Subject[tip:smp/hotplug] powercap/intel rapl: Convert to hotplug state machine
Commit-ID:  29d9013958a6a25f9810a00b0d4ce72d601682ad
Gitweb: http://git.kernel.org/tip/29d9013958a6a25f9810a00b0d4ce72d601682ad
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
AuthorDate: Thu, 17 Nov 2016 19:35:30 +0100
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Mon, 21 Nov 2016 16:37:06 +0100

powercap/intel rapl: Convert to hotplug state machine

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>
Cc: rt@linuxtronix.de
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: linux-pm@vger.kernel.org
Link: http://lkml.kernel.org/r/20161117183541.8588-10-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

---
drivers/powercap/intel_rapl.c | 94 ++++++++++++++++++++++---------------------
1 file changed, 49 insertions(+), 45 deletions(-)

diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c
index 44b12e2..a42dd3b 100644
--- a/drivers/powercap/intel_rapl.c
+++ b/drivers/powercap/intel_rapl.c
@@ -1607,50 +1607,48 @@ err_free_package:
* 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)
+{
+ int phy_package_id;
+ struct rapl_package *rp;
+
+ 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)
{
@@ -1667,36 +1665,42 @@ 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);
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