[PATCH 10/13] cpuidle: psci: Add a helper to attach a CPU to its PM domain
From: Ulf Hansson <hidden>
Date: 2019-10-10 11:40:25
Also in:
linux-arm-kernel, linux-arm-msm
Subsystem:
cpu idle time management framework, cpuidle driver - arm psci pm domain, the rest · Maintainers:
"Rafael J. Wysocki", Daniel Lezcano, Ulf Hansson, Linus Torvalds
Introduce a PSCI DT helper function, psci_dt_attach_cpu(), which takes a CPU number as an in-parameter and tries to attach the CPU's struct device to its corresponding PM domain. Let's makes use of dev_pm_domain_attach_by_name(), as it allows us to specify "psci" as the "name" of the PM domain to attach to. Additionally, let's also prepare the attached device to be power managed via runtime PM. Signed-off-by: Ulf Hansson <redacted> --- drivers/cpuidle/cpuidle-psci-domain.c | 21 +++++++++++++++++++++ drivers/cpuidle/cpuidle-psci.h | 6 ++++++ 2 files changed, 27 insertions(+)
diff --git a/drivers/cpuidle/cpuidle-psci-domain.c b/drivers/cpuidle/cpuidle-psci-domain.c
index 3f5143ccc3e0..7429fd7626a1 100644
--- a/drivers/cpuidle/cpuidle-psci-domain.c
+++ b/drivers/cpuidle/cpuidle-psci-domain.c@@ -9,9 +9,11 @@ #define pr_fmt(fmt) "CPUidle PSCI: " fmt +#include <linux/cpu.h> #include <linux/device.h> #include <linux/kernel.h> #include <linux/pm_domain.h> +#include <linux/pm_runtime.h> #include <linux/psci.h> #include <linux/slab.h> #include <linux/string.h>
@@ -279,3 +281,22 @@ static int __init psci_idle_init_domains(void) return ret; } subsys_initcall(psci_idle_init_domains); + +struct device *psci_dt_attach_cpu(int cpu) +{ + struct device *dev; + + /* Currently limit the hierarchical topology to be used in OSI mode. */ + if (!psci_has_osi_support()) + return NULL; + + dev = dev_pm_domain_attach_by_name(get_cpu_device(cpu), "psci"); + if (IS_ERR_OR_NULL(dev)) + return dev; + + pm_runtime_irq_safe(dev); + if (cpu_online(cpu)) + pm_runtime_get_sync(dev); + + return dev; +}
diff --git a/drivers/cpuidle/cpuidle-psci.h b/drivers/cpuidle/cpuidle-psci.h
index e593de1784c3..d2e55cad9ac6 100644
--- a/drivers/cpuidle/cpuidle-psci.h
+++ b/drivers/cpuidle/cpuidle-psci.h@@ -8,4 +8,10 @@ struct device_node; void psci_set_domain_state(u32 state); int __init psci_dt_parse_state_node(struct device_node *np, u32 *state); +#ifdef CONFIG_PM_GENERIC_DOMAINS_OF +struct device *psci_dt_attach_cpu(int cpu); +#else +static inline struct device *psci_dt_attach_cpu(int cpu) { return NULL; } +#endif + #endif /* __CPUIDLE_PSCI_H */
--
2.17.1