Commit 8d4d4e98 authored by Viresh Kumar's avatar Viresh Kumar Committed by Rafael J. Wysocki

PM / OPP: Add helpers for initializing CPU OPPs

With "operating-points-v2" its possible to tell which devices share
OPPs. We already have infrastructure to decode that information.

This patch adds following APIs:
 - of_get_cpus_sharing_opps: Returns cpumask of CPUs sharing OPPs (only
   valid with v2 bindings).
 - of_cpumask_init_opp_table: Initializes OPPs for all CPUs present in
   cpumask.
 - of_cpumask_free_opp_table: Frees OPPs for all CPUs present in cpumask.

 - set_cpus_sharing_opps: Sets which CPUs share OPPs (only valid with old
   OPP bindings, as this information isn't present in DT).
Reviewed-by: default avatarStephen Boyd <sboyd@codeaurora.org>
Reviewed-by: default avatarBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent ad656a6a
...@@ -11,6 +11,7 @@ ...@@ -11,6 +11,7 @@
* published by the Free Software Foundation. * published by the Free Software Foundation.
*/ */
#include <linux/cpu.h>
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/errno.h> #include <linux/errno.h>
#include <linux/err.h> #include <linux/err.h>
...@@ -1195,6 +1196,26 @@ void of_free_opp_table(struct device *dev) ...@@ -1195,6 +1196,26 @@ void of_free_opp_table(struct device *dev)
} }
EXPORT_SYMBOL_GPL(of_free_opp_table); EXPORT_SYMBOL_GPL(of_free_opp_table);
void of_cpumask_free_opp_table(cpumask_var_t cpumask)
{
struct device *cpu_dev;
int cpu;
WARN_ON(cpumask_empty(cpumask));
for_each_cpu(cpu, cpumask) {
cpu_dev = get_cpu_device(cpu);
if (!cpu_dev) {
pr_err("%s: failed to get cpu%d device\n", __func__,
cpu);
continue;
}
of_free_opp_table(cpu_dev);
}
}
EXPORT_SYMBOL_GPL(of_cpumask_free_opp_table);
/* Returns opp descriptor node from its phandle. Caller must do of_node_put() */ /* Returns opp descriptor node from its phandle. Caller must do of_node_put() */
static struct device_node * static struct device_node *
_of_get_opp_desc_node_from_prop(struct device *dev, const struct property *prop) _of_get_opp_desc_node_from_prop(struct device *dev, const struct property *prop)
...@@ -1211,6 +1232,31 @@ _of_get_opp_desc_node_from_prop(struct device *dev, const struct property *prop) ...@@ -1211,6 +1232,31 @@ _of_get_opp_desc_node_from_prop(struct device *dev, const struct property *prop)
return opp_np; return opp_np;
} }
/* Returns opp descriptor node for a device. Caller must do of_node_put() */
static struct device_node *_of_get_opp_desc_node(struct device *dev)
{
const struct property *prop;
prop = of_find_property(dev->of_node, "operating-points-v2", NULL);
if (!prop)
return ERR_PTR(-ENODEV);
if (!prop->value)
return ERR_PTR(-ENODATA);
/*
* TODO: Support for multiple OPP tables.
*
* There should be only ONE phandle present in "operating-points-v2"
* property.
*/
if (prop->length != sizeof(__be32)) {
dev_err(dev, "%s: Invalid opp desc phandle\n", __func__);
return ERR_PTR(-EINVAL);
}
return _of_get_opp_desc_node_from_prop(dev, prop);
}
/* Initializes OPP tables based on new bindings */ /* Initializes OPP tables based on new bindings */
static int _of_init_opp_table_v2(struct device *dev, static int _of_init_opp_table_v2(struct device *dev,
const struct property *prop) const struct property *prop)
...@@ -1351,4 +1397,133 @@ int of_init_opp_table(struct device *dev) ...@@ -1351,4 +1397,133 @@ int of_init_opp_table(struct device *dev)
return _of_init_opp_table_v2(dev, prop); return _of_init_opp_table_v2(dev, prop);
} }
EXPORT_SYMBOL_GPL(of_init_opp_table); EXPORT_SYMBOL_GPL(of_init_opp_table);
int of_cpumask_init_opp_table(cpumask_var_t cpumask)
{
struct device *cpu_dev;
int cpu, ret = 0;
WARN_ON(cpumask_empty(cpumask));
for_each_cpu(cpu, cpumask) {
cpu_dev = get_cpu_device(cpu);
if (!cpu_dev) {
pr_err("%s: failed to get cpu%d device\n", __func__,
cpu);
continue;
}
ret = of_init_opp_table(cpu_dev);
if (ret) {
pr_err("%s: couldn't find opp table for cpu:%d, %d\n",
__func__, cpu, ret);
/* Free all other OPPs */
of_cpumask_free_opp_table(cpumask);
break;
}
}
return ret;
}
EXPORT_SYMBOL_GPL(of_cpumask_init_opp_table);
/* Required only for V1 bindings, as v2 can manage it from DT itself */
int set_cpus_sharing_opps(struct device *cpu_dev, cpumask_var_t cpumask)
{
struct device_list_opp *list_dev;
struct device_opp *dev_opp;
struct device *dev;
int cpu, ret = 0;
rcu_read_lock();
dev_opp = _find_device_opp(cpu_dev);
if (IS_ERR(dev_opp)) {
ret = -EINVAL;
goto out_rcu_read_unlock;
}
for_each_cpu(cpu, cpumask) {
if (cpu == cpu_dev->id)
continue;
dev = get_cpu_device(cpu);
if (!dev) {
dev_err(cpu_dev, "%s: failed to get cpu%d device\n",
__func__, cpu);
continue;
}
list_dev = _add_list_dev(dev, dev_opp);
if (!list_dev) {
dev_err(dev, "%s: failed to add list-dev for cpu%d device\n",
__func__, cpu);
continue;
}
}
out_rcu_read_unlock:
rcu_read_unlock();
return 0;
}
EXPORT_SYMBOL_GPL(set_cpus_sharing_opps);
/*
* Works only for OPP v2 bindings.
*
* cpumask should be already set to mask of cpu_dev->id.
* Returns -ENOENT if operating-points-v2 bindings aren't supported.
*/
int of_get_cpus_sharing_opps(struct device *cpu_dev, cpumask_var_t cpumask)
{
struct device_node *np, *tmp_np;
struct device *tcpu_dev;
int cpu, ret = 0;
/* Get OPP descriptor node */
np = _of_get_opp_desc_node(cpu_dev);
if (IS_ERR(np)) {
dev_dbg(cpu_dev, "%s: Couldn't find opp node: %ld\n", __func__,
PTR_ERR(np));
return -ENOENT;
}
/* OPPs are shared ? */
if (!of_property_read_bool(np, "opp-shared"))
goto put_cpu_node;
for_each_possible_cpu(cpu) {
if (cpu == cpu_dev->id)
continue;
tcpu_dev = get_cpu_device(cpu);
if (!tcpu_dev) {
dev_err(cpu_dev, "%s: failed to get cpu%d device\n",
__func__, cpu);
ret = -ENODEV;
goto put_cpu_node;
}
/* Get OPP descriptor node */
tmp_np = _of_get_opp_desc_node(tcpu_dev);
if (IS_ERR(tmp_np)) {
dev_err(tcpu_dev, "%s: Couldn't find opp node: %ld\n",
__func__, PTR_ERR(tmp_np));
ret = PTR_ERR(tmp_np);
goto put_cpu_node;
}
/* CPUs are sharing opp node */
if (np == tmp_np)
cpumask_set_cpu(cpu, cpumask);
of_node_put(tmp_np);
}
put_cpu_node:
of_node_put(np);
return ret;
}
EXPORT_SYMBOL_GPL(of_get_cpus_sharing_opps);
#endif #endif
...@@ -121,6 +121,10 @@ static inline struct srcu_notifier_head *dev_pm_opp_get_notifier( ...@@ -121,6 +121,10 @@ static inline struct srcu_notifier_head *dev_pm_opp_get_notifier(
#if defined(CONFIG_PM_OPP) && defined(CONFIG_OF) #if defined(CONFIG_PM_OPP) && defined(CONFIG_OF)
int of_init_opp_table(struct device *dev); int of_init_opp_table(struct device *dev);
void of_free_opp_table(struct device *dev); void of_free_opp_table(struct device *dev);
int of_cpumask_init_opp_table(cpumask_var_t cpumask);
void of_cpumask_free_opp_table(cpumask_var_t cpumask);
int of_get_cpus_sharing_opps(struct device *cpu_dev, cpumask_var_t cpumask);
int set_cpus_sharing_opps(struct device *cpu_dev, cpumask_var_t cpumask);
#else #else
static inline int of_init_opp_table(struct device *dev) static inline int of_init_opp_table(struct device *dev)
{ {
...@@ -130,6 +134,25 @@ static inline int of_init_opp_table(struct device *dev) ...@@ -130,6 +134,25 @@ static inline int of_init_opp_table(struct device *dev)
static inline void of_free_opp_table(struct device *dev) static inline void of_free_opp_table(struct device *dev)
{ {
} }
static inline int of_cpumask_init_opp_table(cpumask_var_t cpumask)
{
return -ENOSYS;
}
static inline void of_cpumask_free_opp_table(cpumask_var_t cpumask)
{
}
static inline int of_get_cpus_sharing_opps(struct device *cpu_dev, cpumask_var_t cpumask)
{
return -ENOSYS;
}
static inline int set_cpus_sharing_opps(struct device *cpu_dev, cpumask_var_t cpumask)
{
return -ENOSYS;
}
#endif #endif
#endif /* __LINUX_OPP_H__ */ #endif /* __LINUX_OPP_H__ */
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