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123 lines
2.8 KiB
123 lines
2.8 KiB
// 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 <[email protected]> |
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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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static 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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static 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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static 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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