mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-03 07:38:10 +00:00
9ffeb6d08c
Current PSCI code handles idle state entry through the psci_cpu_suspend_enter() API, that takes an idle state index as a parameter and convert the index into a previously initialized power_state parameter before calling the PSCI.CPU_SUSPEND() with it. This is unwieldly, since it forces the PSCI firmware layer to keep track of power_state parameter for every idle state so that the index->power_state conversion can be made in the PSCI firmware layer instead of the CPUidle driver implementations. Move the power_state handling out of drivers/firmware/psci into the respective ACPI/DT PSCI CPUidle backends and convert the psci_cpu_suspend_enter() API to get the power_state parameter as input, which makes it closer to its firmware interface PSCI.CPU_SUSPEND() API. A notable side effect is that the PSCI ACPI/DT CPUidle backends now can directly handle (and if needed update) power_state parameters before handing them over to the PSCI firmware interface to trigger PSCI.CPU_SUSPEND() calls. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Sudeep Holla <sudeep.holla@arm.com> Cc: Will Deacon <will@kernel.org> Cc: Ulf Hansson <ulf.hansson@linaro.org> Cc: Sudeep Holla <sudeep.holla@arm.com> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Signed-off-by: Will Deacon <will@kernel.org>
104 lines
2.3 KiB
C
104 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* ARM64 CPU idle arch support
|
|
*
|
|
* Copyright (C) 2014 ARM Ltd.
|
|
* Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
|
|
*/
|
|
|
|
#include <linux/acpi.h>
|
|
#include <linux/cpuidle.h>
|
|
#include <linux/cpu_pm.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/psci.h>
|
|
|
|
#include <asm/cpuidle.h>
|
|
#include <asm/cpu_ops.h>
|
|
|
|
int arm_cpuidle_init(unsigned int cpu)
|
|
{
|
|
int ret = -EOPNOTSUPP;
|
|
|
|
if (cpu_ops[cpu] && cpu_ops[cpu]->cpu_suspend &&
|
|
cpu_ops[cpu]->cpu_init_idle)
|
|
ret = cpu_ops[cpu]->cpu_init_idle(cpu);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* arm_cpuidle_suspend() - function to enter a low-power idle state
|
|
* @arg: argument to pass to CPU suspend operations
|
|
*
|
|
* Return: 0 on success, -EOPNOTSUPP if CPU suspend hook not initialized, CPU
|
|
* operations back-end error code otherwise.
|
|
*/
|
|
int arm_cpuidle_suspend(int index)
|
|
{
|
|
int cpu = smp_processor_id();
|
|
|
|
return cpu_ops[cpu]->cpu_suspend(index);
|
|
}
|
|
|
|
#ifdef CONFIG_ACPI
|
|
|
|
#include <acpi/processor.h>
|
|
|
|
#define ARM64_LPI_IS_RETENTION_STATE(arch_flags) (!(arch_flags))
|
|
|
|
static int psci_acpi_cpu_init_idle(unsigned int cpu)
|
|
{
|
|
int i, count;
|
|
struct acpi_lpi_state *lpi;
|
|
struct acpi_processor *pr = per_cpu(processors, cpu);
|
|
|
|
/*
|
|
* If the PSCI cpu_suspend function hook has not been initialized
|
|
* idle states must not be enabled, so bail out
|
|
*/
|
|
if (!psci_ops.cpu_suspend)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (unlikely(!pr || !pr->flags.has_lpi))
|
|
return -EINVAL;
|
|
|
|
count = pr->power.count - 1;
|
|
if (count <= 0)
|
|
return -ENODEV;
|
|
|
|
for (i = 0; i < count; i++) {
|
|
u32 state;
|
|
|
|
lpi = &pr->power.lpi_states[i + 1];
|
|
/*
|
|
* Only bits[31:0] represent a PSCI power_state while
|
|
* bits[63:32] must be 0x0 as per ARM ACPI FFH Specification
|
|
*/
|
|
state = lpi->address;
|
|
if (!psci_power_state_is_valid(state)) {
|
|
pr_warn("Invalid PSCI power state %#x\n", state);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int acpi_processor_ffh_lpi_probe(unsigned int cpu)
|
|
{
|
|
return psci_acpi_cpu_init_idle(cpu);
|
|
}
|
|
|
|
int acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi)
|
|
{
|
|
u32 state = lpi->address;
|
|
|
|
if (ARM64_LPI_IS_RETENTION_STATE(lpi->arch_flags))
|
|
return CPU_PM_CPU_IDLE_ENTER_RETENTION_PARAM(psci_cpu_suspend_enter,
|
|
lpi->index, state);
|
|
else
|
|
return CPU_PM_CPU_IDLE_ENTER_PARAM(psci_cpu_suspend_enter,
|
|
lpi->index, state);
|
|
}
|
|
#endif
|