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123 lines
2.6 KiB
123 lines
2.6 KiB
// 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 <[email protected]> |
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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 bool cpu_psci_cpu_can_disable(unsigned int cpu) |
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{ |
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return !psci_tos_resident_on(cpu); |
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} |
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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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/* |
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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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psci_ops.cpu_off(state); |
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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; |
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unsigned long start, end; |
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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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start = jiffies; |
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end = start + msecs_to_jiffies(100); |
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do { |
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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 (polled %d ms)\n", cpu, |
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jiffies_to_msecs(jiffies - start)); |
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return 0; |
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} |
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usleep_range(100, 1000); |
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} while (time_before(jiffies, end)); |
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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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.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_can_disable = cpu_psci_cpu_can_disable, |
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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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