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authorUlf Hansson <ulf.hansson@linaro.org>2019-03-27 15:35:46 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-04-10 00:32:34 +0200
commiteb594b7325f61835555140922a4cb715264a325c (patch)
tree4dabc8d09d647ceaf08d084137f586b1d2140a72 /drivers/base/power
parent49a27e279052cf71ba931a26b00194ff46510480 (diff)
PM / Domains: Add support for CPU devices to genpd
To enable a CPU device to be attached to a PM domain managed by genpd, make a few changes to it for convenience. To be able to quickly find out what CPUs are attached to a genpd, which typically becomes useful from a genpd governor as subsequent changes are about to show, add a cpumask to struct generic_pm_domain to be updated when a CPU device gets attached to the genpd containing that cpumask. Also, propagate the cpumask changes upwards in the domain hierarchy to the master PM domains. This way, the cpumask for a genpd hierarchically reflects all CPUs attached to the topology below it. Finally, make this an opt-in feature, to avoid having to manage CPUs and the cpumask for a genpd that don't need it. To that end, add a new genpd configuration bit, GENPD_FLAG_CPU_DOMAIN. Co-developed-by: Lina Iyer <lina.iyer@linaro.org> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> [ rjw: Changelog ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/base/power')
-rw-r--r--drivers/base/power/domain.c65
1 files changed, 64 insertions, 1 deletions
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index ff6f992f7a1d..ecac03dcc9b2 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -22,6 +22,7 @@
#include <linux/sched.h>
#include <linux/suspend.h>
#include <linux/export.h>
+#include <linux/cpu.h>
#include "power.h"
@@ -128,6 +129,7 @@ static const struct genpd_lock_ops genpd_spin_ops = {
#define genpd_is_irq_safe(genpd) (genpd->flags & GENPD_FLAG_IRQ_SAFE)
#define genpd_is_always_on(genpd) (genpd->flags & GENPD_FLAG_ALWAYS_ON)
#define genpd_is_active_wakeup(genpd) (genpd->flags & GENPD_FLAG_ACTIVE_WAKEUP)
+#define genpd_is_cpu_domain(genpd) (genpd->flags & GENPD_FLAG_CPU_DOMAIN)
static inline bool irq_safe_dev_in_no_sleep_domain(struct device *dev,
const struct generic_pm_domain *genpd)
@@ -1454,6 +1456,56 @@ static void genpd_free_dev_data(struct device *dev,
dev_pm_put_subsys_data(dev);
}
+static void __genpd_update_cpumask(struct generic_pm_domain *genpd,
+ int cpu, bool set, unsigned int depth)
+{
+ struct gpd_link *link;
+
+ if (!genpd_is_cpu_domain(genpd))
+ return;
+
+ list_for_each_entry(link, &genpd->slave_links, slave_node) {
+ struct generic_pm_domain *master = link->master;
+
+ genpd_lock_nested(master, depth + 1);
+ __genpd_update_cpumask(master, cpu, set, depth + 1);
+ genpd_unlock(master);
+ }
+
+ if (set)
+ cpumask_set_cpu(cpu, genpd->cpus);
+ else
+ cpumask_clear_cpu(cpu, genpd->cpus);
+}
+
+static void genpd_update_cpumask(struct generic_pm_domain *genpd,
+ struct device *dev, bool set)
+{
+ int cpu;
+
+ if (!genpd_is_cpu_domain(genpd))
+ return;
+
+ for_each_possible_cpu(cpu) {
+ if (get_cpu_device(cpu) == dev) {
+ __genpd_update_cpumask(genpd, cpu, set, 0);
+ return;
+ }
+ }
+}
+
+static void genpd_set_cpumask(struct generic_pm_domain *genpd,
+ struct device *dev)
+{
+ genpd_update_cpumask(genpd, dev, true);
+}
+
+static void genpd_clear_cpumask(struct generic_pm_domain *genpd,
+ struct device *dev)
+{
+ genpd_update_cpumask(genpd, dev, false);
+}
+
static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
struct gpd_timing_data *td)
{
@@ -1475,6 +1527,7 @@ static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
genpd_lock(genpd);
+ genpd_set_cpumask(genpd, dev);
dev_pm_domain_set(dev, &genpd->domain);
genpd->device_count++;
@@ -1532,6 +1585,7 @@ static int genpd_remove_device(struct generic_pm_domain *genpd,
genpd->device_count--;
genpd->max_off_time_changed = true;
+ genpd_clear_cpumask(genpd, dev);
dev_pm_domain_set(dev, NULL);
list_del_init(&pdd->list_node);
@@ -1768,11 +1822,18 @@ int pm_genpd_init(struct generic_pm_domain *genpd,
if (genpd_is_always_on(genpd) && !genpd_status_on(genpd))
return -EINVAL;
+ if (genpd_is_cpu_domain(genpd) &&
+ !zalloc_cpumask_var(&genpd->cpus, GFP_KERNEL))
+ return -ENOMEM;
+
/* Use only one "off" state if there were no states declared */
if (genpd->state_count == 0) {
ret = genpd_set_default_power_state(genpd);
- if (ret)
+ if (ret) {
+ if (genpd_is_cpu_domain(genpd))
+ free_cpumask_var(genpd->cpus);
return ret;
+ }
} else if (!gov && genpd->state_count > 1) {
pr_warn("%s: no governor for states\n", genpd->name);
}
@@ -1818,6 +1879,8 @@ static int genpd_remove(struct generic_pm_domain *genpd)
list_del(&genpd->gpd_list_node);
genpd_unlock(genpd);
cancel_work_sync(&genpd->power_off_work);
+ if (genpd_is_cpu_domain(genpd))
+ free_cpumask_var(genpd->cpus);
if (genpd->free_states)
genpd->free_states(genpd->states, genpd->state_count);