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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 655 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070034.575739538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
124 lines
2.8 KiB
C
124 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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*
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* Copyright (C) 2012 ARM Limited
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*
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* Author: Will Deacon <will.deacon@arm.com>
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*/
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <linux/of.h>
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#include <linux/delay.h>
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#include <linux/psci.h>
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#include <uapi/linux/psci.h>
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#include <asm/psci.h>
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#include <asm/smp_plat.h>
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/*
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* psci_smp assumes that the following is true about PSCI:
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*
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* cpu_suspend Suspend the execution on a CPU
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* @state we don't currently describe affinity levels, so just pass 0.
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* @entry_point the first instruction to be executed on return
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* returns 0 success, < 0 on failure
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*
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* cpu_off Power down a CPU
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* @state we don't currently describe affinity levels, so just pass 0.
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* no return on successful call
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*
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* cpu_on Power up a CPU
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* @cpuid cpuid of target CPU, as from MPIDR
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* @entry_point the first instruction to be executed on return
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* returns 0 success, < 0 on failure
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*
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* migrate Migrate the context to a different CPU
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* @cpuid cpuid of target CPU, as from MPIDR
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* returns 0 success, < 0 on failure
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*
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*/
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extern void secondary_startup(void);
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static int psci_boot_secondary(unsigned int cpu, struct task_struct *idle)
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{
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if (psci_ops.cpu_on)
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return psci_ops.cpu_on(cpu_logical_map(cpu),
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virt_to_idmap(&secondary_startup));
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return -ENODEV;
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}
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#ifdef CONFIG_HOTPLUG_CPU
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int psci_cpu_disable(unsigned int cpu)
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{
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/* Fail early if we don't have CPU_OFF support */
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if (!psci_ops.cpu_off)
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return -EOPNOTSUPP;
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/* Trusted OS will deny CPU_OFF */
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if (psci_tos_resident_on(cpu))
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return -EPERM;
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return 0;
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}
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void psci_cpu_die(unsigned int cpu)
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{
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u32 state = PSCI_POWER_STATE_TYPE_POWER_DOWN <<
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PSCI_0_2_POWER_STATE_TYPE_SHIFT;
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if (psci_ops.cpu_off)
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psci_ops.cpu_off(state);
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/* We should never return */
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panic("psci: cpu %d failed to shutdown\n", cpu);
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}
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int psci_cpu_kill(unsigned int cpu)
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{
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int err, i;
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if (!psci_ops.affinity_info)
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return 1;
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/*
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* cpu_kill could race with cpu_die and we can
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* potentially end up declaring this cpu undead
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* while it is dying. So, try again a few times.
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*/
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for (i = 0; i < 10; i++) {
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err = psci_ops.affinity_info(cpu_logical_map(cpu), 0);
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if (err == PSCI_0_2_AFFINITY_LEVEL_OFF) {
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pr_info("CPU%d killed.\n", cpu);
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return 1;
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}
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msleep(10);
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pr_info("Retrying again to check for CPU kill\n");
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}
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pr_warn("CPU%d may not have shut down cleanly (AFFINITY_INFO reports %d)\n",
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cpu, err);
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/* Make platform_cpu_kill() fail. */
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return 0;
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}
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#endif
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bool __init psci_smp_available(void)
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{
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/* is cpu_on available at least? */
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return (psci_ops.cpu_on != NULL);
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}
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const struct smp_operations psci_smp_ops __initconst = {
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.smp_boot_secondary = psci_boot_secondary,
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#ifdef CONFIG_HOTPLUG_CPU
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.cpu_disable = psci_cpu_disable,
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.cpu_die = psci_cpu_die,
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.cpu_kill = psci_cpu_kill,
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#endif
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};
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