1802d0beec
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>
122 lines
2.5 KiB
C
122 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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*
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* Copyright (C) 2013 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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#define pr_fmt(fmt) "psci: " fmt
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#include <linux/init.h>
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#include <linux/of.h>
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#include <linux/smp.h>
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#include <linux/delay.h>
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#include <linux/psci.h>
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#include <linux/mm.h>
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#include <uapi/linux/psci.h>
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#include <asm/cpu_ops.h>
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#include <asm/errno.h>
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#include <asm/smp_plat.h>
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static int __init cpu_psci_cpu_init(unsigned int cpu)
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{
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return 0;
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}
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static int __init cpu_psci_cpu_prepare(unsigned int cpu)
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{
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if (!psci_ops.cpu_on) {
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pr_err("no cpu_on method, not booting CPU%d\n", cpu);
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return -ENODEV;
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}
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return 0;
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}
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static int cpu_psci_cpu_boot(unsigned int cpu)
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{
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int err = psci_ops.cpu_on(cpu_logical_map(cpu), __pa_symbol(secondary_entry));
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if (err)
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pr_err("failed to boot CPU%d (%d)\n", cpu, err);
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return err;
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}
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#ifdef CONFIG_HOTPLUG_CPU
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static int cpu_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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static void cpu_psci_cpu_die(unsigned int cpu)
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{
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int ret;
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/*
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* There are no known implementations of PSCI actually using the
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* power state field, pass a sensible default for now.
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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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ret = psci_ops.cpu_off(state);
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pr_crit("unable to power off CPU%u (%d)\n", cpu, ret);
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}
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static int cpu_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 0;
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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 0;
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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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return -ETIMEDOUT;
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}
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#endif
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const struct cpu_operations cpu_psci_ops = {
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.name = "psci",
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#ifdef CONFIG_CPU_IDLE
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.cpu_init_idle = psci_cpu_init_idle,
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.cpu_suspend = psci_cpu_suspend_enter,
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#endif
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.cpu_init = cpu_psci_cpu_init,
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.cpu_prepare = cpu_psci_cpu_prepare,
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.cpu_boot = cpu_psci_cpu_boot,
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#ifdef CONFIG_HOTPLUG_CPU
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.cpu_disable = cpu_psci_cpu_disable,
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.cpu_die = cpu_psci_cpu_die,
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.cpu_kill = cpu_psci_cpu_kill,
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#endif
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};
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