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cpuidle: psci: Enable the hierarchical topology for s2ram on PREEMPT_RT

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The hierarchical PM domain topology are currently disabled on a PREEMPT_RT
based configuration. As a first step to enable it to be used, let's try to
attach the CPU devices to their PM domains on PREEMPT_RT. In this way the
syscore ops becomes available, allowing the PM domain topology to be
managed during s2ram.

For the moment let's leave the support for CPU hotplug outside PREEMPT_RT,
as it's depending on using runtime PM. For s2ram, this isn't a problem as
all CPUs are managed via the syscore ops.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Raghavendra Kakarla <quic_rkakarla@quicinc.com>  # qcm6490 with PREEMPT_RT set
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20240527142557.321610-7-ulf.hansson@linaro.org
This commit is contained in:
Ulf Hansson 2024-05-27 16:25:56 +02:00
parent 88bf68b766
commit 4517b1c383
1 changed files with 15 additions and 5 deletions
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20
drivers/cpuidle/cpuidle-psci.c
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@ -37,6 +37,7 @@ struct psci_cpuidle_data {
static DEFINE_PER_CPU_READ_MOSTLY(struct psci_cpuidle_data, psci_cpuidle_data);
static DEFINE_PER_CPU(u32, domain_state);
static bool psci_cpuidle_use_syscore;
static bool psci_cpuidle_use_cpuhp;
void psci_set_domain_state(u32 state)
@ -166,6 +167,12 @@ static struct syscore_ops psci_idle_syscore_ops = {
.resume = psci_idle_syscore_resume,
};
static void psci_idle_init_syscore(void)
{
if (psci_cpuidle_use_syscore)
register_syscore_ops(&psci_idle_syscore_ops);
}
static void psci_idle_init_cpuhp(void)
{
int err;
@ -173,8 +180,6 @@ static void psci_idle_init_cpuhp(void)
if (!psci_cpuidle_use_cpuhp)
return;
register_syscore_ops(&psci_idle_syscore_ops);
err = cpuhp_setup_state_nocalls(CPUHP_AP_CPU_PM_STARTING,
"cpuidle/psci:online",
psci_idle_cpuhp_up,
@ -222,13 +227,16 @@ static int psci_dt_cpu_init_topology(struct cpuidle_driver *drv,
if (!psci_has_osi_support())
return 0;
if (IS_ENABLED(CONFIG_PREEMPT_RT))
return 0;
data->dev = dt_idle_attach_cpu(cpu, "psci");
if (IS_ERR_OR_NULL(data->dev))
return PTR_ERR_OR_ZERO(data->dev);
psci_cpuidle_use_syscore = true;
/* The hierarchical topology is limited to s2ram on PREEMPT_RT. */
if (IS_ENABLED(CONFIG_PREEMPT_RT))
return 0;
/*
* Using the deepest state for the CPU to trigger a potential selection
* of a shared state for the domain, assumes the domain states are all
@ -312,6 +320,7 @@ static void psci_cpu_deinit_idle(int cpu)
struct psci_cpuidle_data *data = per_cpu_ptr(&psci_cpuidle_data, cpu);
dt_idle_detach_cpu(data->dev);
psci_cpuidle_use_syscore = false;
psci_cpuidle_use_cpuhp = false;
}
@ -408,6 +417,7 @@ static int psci_cpuidle_probe(struct platform_device *pdev)
goto out_fail;
}
psci_idle_init_syscore();
psci_idle_init_cpuhp();
return 0;