linux-stable/arch/arm64/kernel/cpu_ops.c
Gavin Shan de58ed5e16 arm64: Introduce get_cpu_ops() helper function
This introduces get_cpu_ops() to return the CPU operations according to
the given CPU index. For now, it simply returns the @cpu_ops[cpu] as
before. Also, helper function __cpu_try_die() is introduced to be shared
by cpu_die() and ipi_cpu_crash_stop(). So it shouldn't introduce any
functional changes.

Signed-off-by: Gavin Shan <gshan@redhat.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
2020-03-24 17:24:19 +00:00

118 lines
2.6 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* CPU kernel entry/exit control
*
* Copyright (C) 2013 ARM Ltd.
*/
#include <linux/acpi.h>
#include <linux/cache.h>
#include <linux/errno.h>
#include <linux/of.h>
#include <linux/string.h>
#include <asm/acpi.h>
#include <asm/cpu_ops.h>
#include <asm/smp_plat.h>
extern const struct cpu_operations smp_spin_table_ops;
#ifdef CONFIG_ARM64_ACPI_PARKING_PROTOCOL
extern const struct cpu_operations acpi_parking_protocol_ops;
#endif
extern const struct cpu_operations cpu_psci_ops;
static const struct cpu_operations *cpu_ops[NR_CPUS] __ro_after_init;
static const struct cpu_operations *const dt_supported_cpu_ops[] __initconst = {
&smp_spin_table_ops,
&cpu_psci_ops,
NULL,
};
static const struct cpu_operations *const acpi_supported_cpu_ops[] __initconst = {
#ifdef CONFIG_ARM64_ACPI_PARKING_PROTOCOL
&acpi_parking_protocol_ops,
#endif
&cpu_psci_ops,
NULL,
};
static const struct cpu_operations * __init cpu_get_ops(const char *name)
{
const struct cpu_operations *const *ops;
ops = acpi_disabled ? dt_supported_cpu_ops : acpi_supported_cpu_ops;
while (*ops) {
if (!strcmp(name, (*ops)->name))
return *ops;
ops++;
}
return NULL;
}
static const char *__init cpu_read_enable_method(int cpu)
{
const char *enable_method;
if (acpi_disabled) {
struct device_node *dn = of_get_cpu_node(cpu, NULL);
if (!dn) {
if (!cpu)
pr_err("Failed to find device node for boot cpu\n");
return NULL;
}
enable_method = of_get_property(dn, "enable-method", NULL);
if (!enable_method) {
/*
* The boot CPU may not have an enable method (e.g.
* when spin-table is used for secondaries).
* Don't warn spuriously.
*/
if (cpu != 0)
pr_err("%pOF: missing enable-method property\n",
dn);
}
of_node_put(dn);
} else {
enable_method = acpi_get_enable_method(cpu);
if (!enable_method) {
/*
* In ACPI systems the boot CPU does not require
* checking the enable method since for some
* boot protocol (ie parking protocol) it need not
* be initialized. Don't warn spuriously.
*/
if (cpu != 0)
pr_err("Unsupported ACPI enable-method\n");
}
}
return enable_method;
}
/*
* Read a cpu's enable method and record it in cpu_ops.
*/
int __init init_cpu_ops(int cpu)
{
const char *enable_method = cpu_read_enable_method(cpu);
if (!enable_method)
return -ENODEV;
cpu_ops[cpu] = cpu_get_ops(enable_method);
if (!cpu_ops[cpu]) {
pr_warn("Unsupported enable-method: %s\n", enable_method);
return -EOPNOTSUPP;
}
return 0;
}
const struct cpu_operations *get_cpu_ops(int cpu)
{
return cpu_ops[cpu];
}