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Subject[PATCH 10/20] powercap/intel_rapl: Cleanup duplicated init code
Date
From: Thomas Gleixner <tglx@linutronix.de>

The whole init/exit code is a duplicate of the cpuhotplug code. So we can
just let the hotplug code do the actual work of setting up and tearing down
the domains.

Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: linux-pm@vger.kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
drivers/powercap/intel_rapl.c | 173 +++++-------------------------------------
1 file changed, 20 insertions(+), 153 deletions(-)

diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c
index a42dd3b7e8a1..6c2e415c55c1 100644
--- a/drivers/powercap/intel_rapl.c
+++ b/drivers/powercap/intel_rapl.c
@@ -275,18 +275,6 @@ static struct rapl_package *find_package_by_id(int id)
return NULL;
}

-/* caller must hold cpu hotplug lock */
-static void rapl_cleanup_data(void)
-{
- struct rapl_package *p, *tmp;
-
- list_for_each_entry_safe(p, tmp, &rapl_packages, plist) {
- kfree(p->domains);
- list_del(&p->plist);
- kfree(p);
- }
-}
-
static int get_energy_counter(struct powercap_zone *power_zone, u64 *energy_raw)
{
struct rapl_domain *rd;
@@ -1173,58 +1161,24 @@ static void rapl_update_domain_data(struct rapl_package *rp)
for (dmn = 0; dmn < rp->nr_domains; dmn++) {
pr_debug("update package %d domain %s data\n", rp->id,
rp->domains[dmn].name);
- /* exclude non-raw primitives */
+ /* exclude non-raw primitives */
for (prim = 0; prim < NR_RAW_PRIMITIVES; prim++) {
if (!rapl_read_data_raw(&rp->domains[dmn], prim,
- rpi[prim].unit, &val))
- rp->domains[dmn].rdd.primitives[prim] = val;
+ rpi[prim].unit, &val))
+ rp->domains[dmn].rdd.primitives[prim] = val;
}
}

}

-static int rapl_unregister_powercap(void)
+static void rapl_unregister_powercap(void)
{
- struct rapl_package *rp;
- struct rapl_domain *rd, *rd_package = NULL;
-
- /* unregister all active rapl packages from the powercap layer,
- * hotplug lock held
- */
- list_for_each_entry(rp, &rapl_packages, plist) {
- package_power_limit_irq_restore(rp);
-
- for (rd = rp->domains; rd < rp->domains + rp->nr_domains;
- rd++) {
- pr_debug("remove package, undo power limit on %d: %s\n",
- rp->id, rd->name);
- rapl_write_data_raw(rd, PL1_ENABLE, 0);
- rapl_write_data_raw(rd, PL1_CLAMP, 0);
- if (find_nr_power_limit(rd) > 1) {
- rapl_write_data_raw(rd, PL2_ENABLE, 0);
- rapl_write_data_raw(rd, PL2_CLAMP, 0);
- }
- if (rd->id == RAPL_DOMAIN_PACKAGE) {
- rd_package = rd;
- continue;
- }
- powercap_unregister_zone(control_type, &rd->power_zone);
- }
- /* do the package zone last */
- if (rd_package)
- powercap_unregister_zone(control_type,
- &rd_package->power_zone);
- }
-
if (platform_rapl_domain) {
powercap_unregister_zone(control_type,
&platform_rapl_domain->power_zone);
kfree(platform_rapl_domain);
}
-
powercap_unregister_control_type(control_type);
-
- return 0;
}

static int rapl_package_register_powercap(struct rapl_package *rp)
@@ -1347,37 +1301,16 @@ static int rapl_register_psys(void)

static int rapl_register_powercap(void)
{
- struct rapl_domain *rd;
- struct rapl_package *rp;
- int ret = 0;
-
control_type = powercap_register_control_type(NULL, "intel-rapl", NULL);
if (IS_ERR(control_type)) {
pr_debug("failed to register powercap control_type.\n");
return PTR_ERR(control_type);
}

- list_for_each_entry(rp, &rapl_packages, plist)
- if (rapl_package_register_powercap(rp))
- goto err_cleanup_package;
-
/* Don't bail out if PSys is not supported */
rapl_register_psys();

- return ret;
-
-err_cleanup_package:
- /* clean up previously initialized packages */
- list_for_each_entry_continue_reverse(rp, &rapl_packages, plist) {
- for (rd = rp->domains; rd < rp->domains + rp->nr_domains;
- rd++) {
- pr_debug("unregister zone/package %d, %s domain\n",
- rp->id, rd->name);
- powercap_unregister_zone(control_type, &rd->power_zone);
- }
- }
-
- return ret;
+ return 0;
}

static int rapl_check_domain(int cpu, int domain)
@@ -1486,76 +1419,26 @@ static int rapl_detect_domains(struct rapl_package *rp, int cpu)
return ret;
}

-static bool is_package_new(int package)
-{
- struct rapl_package *rp;
-
- /* caller prevents cpu hotplug, there will be no new packages added
- * or deleted while traversing the package list, no need for locking.
- */
- list_for_each_entry(rp, &rapl_packages, plist)
- if (package == rp->id)
- return false;
-
- return true;
-}
-
-/* RAPL interface can be made of a two-level hierarchy: package level and domain
- * level. We first detect the number of packages then domains of each package.
- * We have to consider the possiblity of CPU online/offline due to hotplug and
- * other scenarios.
- */
-static int rapl_detect_topology(void)
-{
- int i;
- int phy_package_id;
- struct rapl_package *new_package, *rp;
-
- for_each_online_cpu(i) {
- phy_package_id = topology_physical_package_id(i);
- if (is_package_new(phy_package_id)) {
- new_package = kzalloc(sizeof(*rp), GFP_KERNEL);
- if (!new_package) {
- rapl_cleanup_data();
- return -ENOMEM;
- }
- /* add the new package to the list */
- new_package->id = phy_package_id;
- new_package->nr_cpus = 1;
- /* use the first active cpu of the package to access */
- new_package->lead_cpu = i;
- /* check if the package contains valid domains */
- if (rapl_detect_domains(new_package, i) ||
- rapl_defaults->check_unit(new_package, i)) {
- kfree(new_package->domains);
- kfree(new_package);
- /* free up the packages already initialized */
- rapl_cleanup_data();
- return -ENODEV;
- }
- INIT_LIST_HEAD(&new_package->plist);
- list_add(&new_package->plist, &rapl_packages);
- } else {
- rp = find_package_by_id(phy_package_id);
- if (rp)
- ++rp->nr_cpus;
- }
- }
-
- return 0;
-}
-
/* called from CPU hotplug notifier, hotplug lock held */
static void rapl_remove_package(struct rapl_package *rp)
{
struct rapl_domain *rd, *rd_package = NULL;

for (rd = rp->domains; rd < rp->domains + rp->nr_domains; rd++) {
+ package_power_limit_irq_restore(rp);
+
+ pr_debug("remove package, undo power limit on %d: %s\n",
+ rp->id, rd->name);
+ rapl_write_data_raw(rd, PL1_ENABLE, 0);
+ rapl_write_data_raw(rd, PL1_CLAMP, 0);
+ if (find_nr_power_limit(rd) > 1) {
+ rapl_write_data_raw(rd, PL2_ENABLE, 0);
+ rapl_write_data_raw(rd, PL2_CLAMP, 0);
+ }
if (rd->id == RAPL_DOMAIN_PACKAGE) {
rd_package = rd;
continue;
}
- pr_debug("remove package %d, %s domain\n", rp->id, rd->name);
powercap_unregister_zone(control_type, &rd->power_zone);
}
/* do parent zone last */
@@ -1652,8 +1535,8 @@ static enum cpuhp_state pcap_rapl_online;

static int __init rapl_init(void)
{
- int ret = 0;
const struct x86_cpu_id *id;
+ int ret;

id = x86_match_cpu(rapl_ids);
if (!id) {
@@ -1665,42 +1548,26 @@ static int __init rapl_init(void)

rapl_defaults = (struct rapl_defaults *)id->driver_data;

- /* prevent CPU hotplug during detection */
- get_online_cpus();
- ret = rapl_detect_topology();
+ ret = rapl_register_powercap();
if (ret)
- goto err;
+ return ret;

- if (rapl_register_powercap()) {
- ret = -ENODEV;
- goto err_cleanup;
- }
- ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
- "powercap/rapl:online",
- rapl_cpu_online, rapl_cpu_down_prep);
+ ret = cpuhp_setup_state(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();
return 0;

err_unreg:
rapl_unregister_powercap();
-
-err_cleanup:
- rapl_cleanup_data();
-err:
- put_online_cpus();
return ret;
}

static void __exit rapl_exit(void)
{
- get_online_cpus();
cpuhp_remove_state(pcap_rapl_online);
rapl_unregister_powercap();
- rapl_cleanup_data();
- put_online_cpus();
}

module_init(rapl_init);
--
2.10.2
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