Merge tag 'pm-6.10-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull power management fixes from Rafael Wysocki:
"These fix the amd-pstate driver and the operating performance point
(OPP) handling related to generic PM domains.
Specifics:
- Fix a memory leak in the exit path of amd-pstate (Peng Ma)
- Fix required_opp_tables handling in the cases when multiple generic
PM domains share one OPP table (Viresh Kumar)"
* tag 'pm-6.10-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
OPP: Fix required_opp_tables for multiple genpds using same table
cpufreq: amd-pstate: fix memory leak on CPU EPP exit
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index 6a342b0..1b7e82a 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -1441,6 +1441,13 @@ static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy)
static int amd_pstate_epp_cpu_exit(struct cpufreq_policy *policy)
{
+ struct amd_cpudata *cpudata = policy->driver_data;
+
+ if (cpudata) {
+ kfree(cpudata);
+ policy->driver_data = NULL;
+ }
+
pr_debug("CPU %d exiting\n", policy->cpu);
return 0;
}
diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index e233734..cb4611f 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -2394,7 +2394,8 @@ static void _opp_detach_genpd(struct opp_table *opp_table)
static int _opp_attach_genpd(struct opp_table *opp_table, struct device *dev,
const char * const *names, struct device ***virt_devs)
{
- struct device *virt_dev;
+ struct device *virt_dev, *gdev;
+ struct opp_table *genpd_table;
int index = 0, ret = -EINVAL;
const char * const *name = names;
@@ -2428,6 +2429,34 @@ static int _opp_attach_genpd(struct opp_table *opp_table, struct device *dev,
}
/*
+ * The required_opp_tables parsing is not perfect, as the OPP
+ * core does the parsing solely based on the DT node pointers.
+ * The core sets the required_opp_tables entry to the first OPP
+ * table in the "opp_tables" list, that matches with the node
+ * pointer.
+ *
+ * If the target DT OPP table is used by multiple devices and
+ * they all create separate instances of 'struct opp_table' from
+ * it, then it is possible that the required_opp_tables entry
+ * may be set to the incorrect sibling device.
+ *
+ * Cross check it again and fix if required.
+ */
+ gdev = dev_to_genpd_dev(virt_dev);
+ if (IS_ERR(gdev))
+ return PTR_ERR(gdev);
+
+ genpd_table = _find_opp_table(gdev);
+ if (!IS_ERR(genpd_table)) {
+ if (genpd_table != opp_table->required_opp_tables[index]) {
+ dev_pm_opp_put_opp_table(opp_table->required_opp_tables[index]);
+ opp_table->required_opp_tables[index] = genpd_table;
+ } else {
+ dev_pm_opp_put_opp_table(genpd_table);
+ }
+ }
+
+ /*
* Add the virtual genpd device as a user of the OPP table, so
* we can call dev_pm_opp_set_opp() on it directly.
*
diff --git a/drivers/pmdomain/core.c b/drivers/pmdomain/core.c
index 3427794..623d15b 100644
--- a/drivers/pmdomain/core.c
+++ b/drivers/pmdomain/core.c
@@ -184,6 +184,16 @@ static struct generic_pm_domain *dev_to_genpd(struct device *dev)
return pd_to_genpd(dev->pm_domain);
}
+struct device *dev_to_genpd_dev(struct device *dev)
+{
+ struct generic_pm_domain *genpd = dev_to_genpd(dev);
+
+ if (IS_ERR(genpd))
+ return ERR_CAST(genpd);
+
+ return &genpd->dev;
+}
+
static int genpd_stop_dev(const struct generic_pm_domain *genpd,
struct device *dev)
{
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 772d328..f24546a3 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -260,6 +260,7 @@ int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
int pm_genpd_init(struct generic_pm_domain *genpd,
struct dev_power_governor *gov, bool is_off);
int pm_genpd_remove(struct generic_pm_domain *genpd);
+struct device *dev_to_genpd_dev(struct device *dev);
int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state);
int dev_pm_genpd_add_notifier(struct device *dev, struct notifier_block *nb);
int dev_pm_genpd_remove_notifier(struct device *dev);
@@ -307,6 +308,11 @@ static inline int pm_genpd_remove(struct generic_pm_domain *genpd)
return -EOPNOTSUPP;
}
+static inline struct device *dev_to_genpd_dev(struct device *dev)
+{
+ return ERR_PTR(-EOPNOTSUPP);
+}
+
static inline int dev_pm_genpd_set_performance_state(struct device *dev,
unsigned int state)
{
