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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: Stephen Boyd <sboyd@codeaurora.org> Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar
Rafael J. Wysocki
parent
ad656a6a8b
commit
8d4d4e98ac
@ -11,6 +11,7 @@
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* published by the Free Software Foundation.
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*/
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#include <linux/cpu.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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@ -1195,6 +1196,26 @@ unlock:
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}
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EXPORT_SYMBOL_GPL(of_free_opp_table);
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void of_cpumask_free_opp_table(cpumask_var_t cpumask)
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{
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struct device *cpu_dev;
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int cpu;
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WARN_ON(cpumask_empty(cpumask));
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for_each_cpu(cpu, cpumask) {
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cpu_dev = get_cpu_device(cpu);
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if (!cpu_dev) {
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pr_err("%s: failed to get cpu%d device\n", __func__,
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cpu);
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continue;
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}
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of_free_opp_table(cpu_dev);
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}
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}
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EXPORT_SYMBOL_GPL(of_cpumask_free_opp_table);
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/* Returns opp descriptor node from its phandle. Caller must do of_node_put() */
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static struct device_node *
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_of_get_opp_desc_node_from_prop(struct device *dev, const struct property *prop)
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@ -1211,6 +1232,31 @@ _of_get_opp_desc_node_from_prop(struct device *dev, const struct property *prop)
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return opp_np;
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}
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/* Returns opp descriptor node for a device. Caller must do of_node_put() */
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static struct device_node *_of_get_opp_desc_node(struct device *dev)
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{
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const struct property *prop;
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prop = of_find_property(dev->of_node, "operating-points-v2", NULL);
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if (!prop)
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return ERR_PTR(-ENODEV);
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if (!prop->value)
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return ERR_PTR(-ENODATA);
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/*
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* TODO: Support for multiple OPP tables.
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*
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* There should be only ONE phandle present in "operating-points-v2"
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* property.
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*/
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if (prop->length != sizeof(__be32)) {
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dev_err(dev, "%s: Invalid opp desc phandle\n", __func__);
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return ERR_PTR(-EINVAL);
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}
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return _of_get_opp_desc_node_from_prop(dev, prop);
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}
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/* Initializes OPP tables based on new bindings */
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static int _of_init_opp_table_v2(struct device *dev,
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const struct property *prop)
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@ -1351,4 +1397,133 @@ int of_init_opp_table(struct device *dev)
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return _of_init_opp_table_v2(dev, prop);
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}
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EXPORT_SYMBOL_GPL(of_init_opp_table);
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int of_cpumask_init_opp_table(cpumask_var_t cpumask)
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{
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struct device *cpu_dev;
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int cpu, ret = 0;
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WARN_ON(cpumask_empty(cpumask));
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for_each_cpu(cpu, cpumask) {
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cpu_dev = get_cpu_device(cpu);
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if (!cpu_dev) {
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pr_err("%s: failed to get cpu%d device\n", __func__,
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cpu);
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continue;
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}
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ret = of_init_opp_table(cpu_dev);
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if (ret) {
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pr_err("%s: couldn't find opp table for cpu:%d, %d\n",
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__func__, cpu, ret);
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/* Free all other OPPs */
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of_cpumask_free_opp_table(cpumask);
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break;
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}
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(of_cpumask_init_opp_table);
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/* Required only for V1 bindings, as v2 can manage it from DT itself */
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int set_cpus_sharing_opps(struct device *cpu_dev, cpumask_var_t cpumask)
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{
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struct device_list_opp *list_dev;
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struct device_opp *dev_opp;
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struct device *dev;
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int cpu, ret = 0;
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rcu_read_lock();
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dev_opp = _find_device_opp(cpu_dev);
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if (IS_ERR(dev_opp)) {
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ret = -EINVAL;
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goto out_rcu_read_unlock;
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}
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for_each_cpu(cpu, cpumask) {
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if (cpu == cpu_dev->id)
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continue;
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dev = get_cpu_device(cpu);
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if (!dev) {
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dev_err(cpu_dev, "%s: failed to get cpu%d device\n",
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__func__, cpu);
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continue;
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}
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list_dev = _add_list_dev(dev, dev_opp);
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if (!list_dev) {
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dev_err(dev, "%s: failed to add list-dev for cpu%d device\n",
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__func__, cpu);
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continue;
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}
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}
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out_rcu_read_unlock:
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rcu_read_unlock();
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return 0;
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}
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EXPORT_SYMBOL_GPL(set_cpus_sharing_opps);
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/*
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* Works only for OPP v2 bindings.
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*
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* cpumask should be already set to mask of cpu_dev->id.
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* Returns -ENOENT if operating-points-v2 bindings aren't supported.
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*/
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int of_get_cpus_sharing_opps(struct device *cpu_dev, cpumask_var_t cpumask)
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{
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struct device_node *np, *tmp_np;
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struct device *tcpu_dev;
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int cpu, ret = 0;
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/* Get OPP descriptor node */
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np = _of_get_opp_desc_node(cpu_dev);
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if (IS_ERR(np)) {
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dev_dbg(cpu_dev, "%s: Couldn't find opp node: %ld\n", __func__,
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PTR_ERR(np));
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return -ENOENT;
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}
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/* OPPs are shared ? */
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if (!of_property_read_bool(np, "opp-shared"))
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goto put_cpu_node;
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for_each_possible_cpu(cpu) {
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if (cpu == cpu_dev->id)
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continue;
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tcpu_dev = get_cpu_device(cpu);
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if (!tcpu_dev) {
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dev_err(cpu_dev, "%s: failed to get cpu%d device\n",
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__func__, cpu);
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ret = -ENODEV;
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goto put_cpu_node;
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}
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/* Get OPP descriptor node */
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tmp_np = _of_get_opp_desc_node(tcpu_dev);
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if (IS_ERR(tmp_np)) {
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dev_err(tcpu_dev, "%s: Couldn't find opp node: %ld\n",
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__func__, PTR_ERR(tmp_np));
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ret = PTR_ERR(tmp_np);
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goto put_cpu_node;
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}
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/* CPUs are sharing opp node */
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if (np == tmp_np)
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cpumask_set_cpu(cpu, cpumask);
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of_node_put(tmp_np);
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}
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put_cpu_node:
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of_node_put(np);
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return ret;
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}
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EXPORT_SYMBOL_GPL(of_get_cpus_sharing_opps);
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#endif
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@ -121,6 +121,10 @@ static inline struct srcu_notifier_head *dev_pm_opp_get_notifier(
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#if defined(CONFIG_PM_OPP) && defined(CONFIG_OF)
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int of_init_opp_table(struct device *dev);
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void of_free_opp_table(struct device *dev);
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int of_cpumask_init_opp_table(cpumask_var_t cpumask);
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void of_cpumask_free_opp_table(cpumask_var_t cpumask);
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int of_get_cpus_sharing_opps(struct device *cpu_dev, cpumask_var_t cpumask);
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int set_cpus_sharing_opps(struct device *cpu_dev, cpumask_var_t cpumask);
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#else
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static inline int of_init_opp_table(struct device *dev)
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{
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@ -130,6 +134,25 @@ static inline int of_init_opp_table(struct device *dev)
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static inline void of_free_opp_table(struct device *dev)
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{
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}
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static inline int of_cpumask_init_opp_table(cpumask_var_t cpumask)
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{
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return -ENOSYS;
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}
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static inline void of_cpumask_free_opp_table(cpumask_var_t cpumask)
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{
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}
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static inline int of_get_cpus_sharing_opps(struct device *cpu_dev, cpumask_var_t cpumask)
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{
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return -ENOSYS;
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}
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static inline int set_cpus_sharing_opps(struct device *cpu_dev, cpumask_var_t cpumask)
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{
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return -ENOSYS;
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}
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#endif
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#endif /* __LINUX_OPP_H__ */
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