105774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini/* 205774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * This program is free software; you can redistribute it and/or modify 305774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * it under the terms of the GNU General Public License version 2 as 405774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * published by the Free Software Foundation. 505774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * 605774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * This program is distributed in the hope that it will be useful, 705774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * but WITHOUT ANY WARRANTY; without even the implied warranty of 805774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 905774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * GNU General Public License for more details. 1005774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * 1105774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * Copyright (C) 2012 ARM Limited 1205774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * 1305774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * Author: Will Deacon <will.deacon@arm.com> 1405774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini */ 1505774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini 1605774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini#include <linux/init.h> 1705774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini#include <linux/smp.h> 1805774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini#include <linux/of.h> 19c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule#include <linux/delay.h> 20c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule#include <uapi/linux/psci.h> 2105774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini 2205774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini#include <asm/psci.h> 2305774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini#include <asm/smp_plat.h> 2405774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini 2505774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini/* 2605774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * psci_smp assumes that the following is true about PSCI: 2705774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * 2805774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * cpu_suspend Suspend the execution on a CPU 2905774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * @state we don't currently describe affinity levels, so just pass 0. 3005774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * @entry_point the first instruction to be executed on return 3105774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * returns 0 success, < 0 on failure 3205774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * 3305774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * cpu_off Power down a CPU 3405774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * @state we don't currently describe affinity levels, so just pass 0. 3505774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * no return on successful call 3605774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * 3705774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * cpu_on Power up a CPU 3805774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * @cpuid cpuid of target CPU, as from MPIDR 3905774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * @entry_point the first instruction to be executed on return 4005774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * returns 0 success, < 0 on failure 4105774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * 4205774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * migrate Migrate the context to a different CPU 4305774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * @cpuid cpuid of target CPU, as from MPIDR 4405774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * returns 0 success, < 0 on failure 4505774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini * 4605774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini */ 4705774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini 4805774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabelliniextern void secondary_startup(void); 4905774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini 508bd26e3a7e49af2697449bbcb7187a39dc85d672Paul Gortmakerstatic int psci_boot_secondary(unsigned int cpu, struct task_struct *idle) 5105774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini{ 5205774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini if (psci_ops.cpu_on) 5305774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini return psci_ops.cpu_on(cpu_logical_map(cpu), 5405774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini __pa(secondary_startup)); 5505774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini return -ENODEV; 5605774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini} 5705774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini 5805774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini#ifdef CONFIG_HOTPLUG_CPU 5905774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellinivoid __ref psci_cpu_die(unsigned int cpu) 6005774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini{ 6105774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini const struct psci_power_state ps = { 6205774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini .type = PSCI_POWER_STATE_TYPE_POWER_DOWN, 6305774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini }; 6405774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini 6505774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini if (psci_ops.cpu_off) 6605774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini psci_ops.cpu_off(ps); 6705774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini 6805774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini /* We should never return */ 6905774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini panic("psci: cpu %d failed to shutdown\n", cpu); 7005774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini} 71c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule 72c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chauguleint __ref psci_cpu_kill(unsigned int cpu) 73c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule{ 74c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule int err, i; 75c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule 76c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule if (!psci_ops.affinity_info) 77c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule return 1; 78c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule /* 79c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule * cpu_kill could race with cpu_die and we can 80c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule * potentially end up declaring this cpu undead 81c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule * while it is dying. So, try again a few times. 82c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule */ 83c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule 84c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule for (i = 0; i < 10; i++) { 85c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule err = psci_ops.affinity_info(cpu_logical_map(cpu), 0); 86c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule if (err == PSCI_0_2_AFFINITY_LEVEL_OFF) { 87c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule pr_info("CPU%d killed.\n", cpu); 88c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule return 1; 89c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule } 90c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule 91c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule msleep(10); 92c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule pr_info("Retrying again to check for CPU kill\n"); 93c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule } 94c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule 95c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule pr_warn("CPU%d may not have shut down cleanly (AFFINITY_INFO reports %d)\n", 96c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule cpu, err); 97c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule /* Make platform_cpu_kill() fail. */ 98c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule return 0; 99c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule} 100c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule 10105774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini#endif 10205774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini 10305774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellinibool __init psci_smp_available(void) 10405774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini{ 10505774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini /* is cpu_on available at least? */ 10605774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini return (psci_ops.cpu_on != NULL); 10705774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini} 10805774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini 10905774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellinistruct smp_operations __initdata psci_smp_ops = { 11005774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini .smp_boot_secondary = psci_boot_secondary, 111fdeb94b5dc5bf9db7b3e36f3f38089a554f6a108Arnd Bergmann#ifdef CONFIG_HOTPLUG_CPU 11205774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini .cpu_die = psci_cpu_die, 113c814ca029e1015bb0ecec312f4bb9751ba1a711aAshwin Chaugule .cpu_kill = psci_cpu_kill, 114fdeb94b5dc5bf9db7b3e36f3f38089a554f6a108Arnd Bergmann#endif 11505774088391c7430f6a4c1d5d18196ef17bb3ba9Stefano Stabellini}; 116