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Thomas Gleixner1802d0b2019-05-27 08:55:21 +02001// SPDX-License-Identifier: GPL-2.0-only
Will Deacone790f1d2012-12-18 17:53:14 +00002/*
Will Deacone790f1d2012-12-18 17:53:14 +00003 *
4 * Copyright (C) 2013 ARM Limited
5 *
6 * Author: Will Deacon <will.deacon@arm.com>
7 */
8
9#define pr_fmt(fmt) "psci: " fmt
10
11#include <linux/init.h>
12#include <linux/of.h>
Mark Rutland00ef54b2013-10-24 20:30:14 +010013#include <linux/smp.h>
Ashwin Chaugulec814ca02014-05-07 10:18:36 -040014#include <linux/delay.h>
Mark Rutlandbff60792015-07-31 15:46:16 +010015#include <linux/psci.h>
Laura Abbott2077be62017-01-10 13:35:49 -080016#include <linux/mm.h>
Mark Rutlandbff60792015-07-31 15:46:16 +010017
Ashwin Chaugulee71246a2014-04-17 14:38:41 -040018#include <uapi/linux/psci.h>
Will Deacone790f1d2012-12-18 17:53:14 +000019
Mark Rutlandcd1aebf2013-10-24 20:30:15 +010020#include <asm/cpu_ops.h>
Will Deacone790f1d2012-12-18 17:53:14 +000021#include <asm/errno.h>
Mark Rutland00ef54b2013-10-24 20:30:14 +010022#include <asm/smp_plat.h>
Lorenzo Pieralisi18910ab2013-09-27 10:25:02 +010023
Lorenzo Pieralisi819a8822015-05-13 14:12:46 +010024static int __init cpu_psci_cpu_init(unsigned int cpu)
Mark Rutland00ef54b2013-10-24 20:30:14 +010025{
26 return 0;
27}
28
Mark Rutlandcd1aebf2013-10-24 20:30:15 +010029static int __init cpu_psci_cpu_prepare(unsigned int cpu)
Mark Rutland00ef54b2013-10-24 20:30:14 +010030{
Mark Rutland00ef54b2013-10-24 20:30:14 +010031 if (!psci_ops.cpu_on) {
32 pr_err("no cpu_on method, not booting CPU%d\n", cpu);
33 return -ENODEV;
34 }
35
Mark Rutland00ef54b2013-10-24 20:30:14 +010036 return 0;
37}
38
Mark Rutland652af892013-10-24 20:30:16 +010039static int cpu_psci_cpu_boot(unsigned int cpu)
40{
Laura Abbott2077be62017-01-10 13:35:49 -080041 int err = psci_ops.cpu_on(cpu_logical_map(cpu), __pa_symbol(secondary_entry));
Mark Rutland652af892013-10-24 20:30:16 +010042 if (err)
Vladimir Murzin288ac262014-02-28 09:57:47 +000043 pr_err("failed to boot CPU%d (%d)\n", cpu, err);
Mark Rutland652af892013-10-24 20:30:16 +010044
45 return err;
46}
47
Mark Rutland831ccf72013-10-24 20:30:19 +010048#ifdef CONFIG_HOTPLUG_CPU
49static int cpu_psci_cpu_disable(unsigned int cpu)
50{
51 /* Fail early if we don't have CPU_OFF support */
52 if (!psci_ops.cpu_off)
53 return -EOPNOTSUPP;
Mark Rutlandff3010e2015-04-22 18:10:26 +010054
55 /* Trusted OS will deny CPU_OFF */
56 if (psci_tos_resident_on(cpu))
57 return -EPERM;
58
Mark Rutland831ccf72013-10-24 20:30:19 +010059 return 0;
60}
61
62static void cpu_psci_cpu_die(unsigned int cpu)
63{
64 int ret;
65 /*
66 * There are no known implementations of PSCI actually using the
67 * power state field, pass a sensible default for now.
68 */
Mark Rutlandc8cc4272015-04-30 17:59:03 +010069 u32 state = PSCI_POWER_STATE_TYPE_POWER_DOWN <<
70 PSCI_0_2_POWER_STATE_TYPE_SHIFT;
Mark Rutland831ccf72013-10-24 20:30:19 +010071
72 ret = psci_ops.cpu_off(state);
73
Vladimir Murzin288ac262014-02-28 09:57:47 +000074 pr_crit("unable to power off CPU%u (%d)\n", cpu, ret);
Mark Rutland831ccf72013-10-24 20:30:19 +010075}
Ashwin Chaugulec814ca02014-05-07 10:18:36 -040076
77static int cpu_psci_cpu_kill(unsigned int cpu)
78{
79 int err, i;
80
81 if (!psci_ops.affinity_info)
Mark Rutland6b99c68c2015-04-20 17:55:30 +010082 return 0;
Ashwin Chaugulec814ca02014-05-07 10:18:36 -040083 /*
84 * cpu_kill could race with cpu_die and we can
85 * potentially end up declaring this cpu undead
86 * while it is dying. So, try again a few times.
87 */
88
89 for (i = 0; i < 10; i++) {
90 err = psci_ops.affinity_info(cpu_logical_map(cpu), 0);
91 if (err == PSCI_0_2_AFFINITY_LEVEL_OFF) {
92 pr_info("CPU%d killed.\n", cpu);
Mark Rutland6b99c68c2015-04-20 17:55:30 +010093 return 0;
Ashwin Chaugulec814ca02014-05-07 10:18:36 -040094 }
95
96 msleep(10);
97 pr_info("Retrying again to check for CPU kill\n");
98 }
99
100 pr_warn("CPU%d may not have shut down cleanly (AFFINITY_INFO reports %d)\n",
101 cpu, err);
Mark Rutland6b99c68c2015-04-20 17:55:30 +0100102 return -ETIMEDOUT;
Ashwin Chaugulec814ca02014-05-07 10:18:36 -0400103}
Mark Rutland831ccf72013-10-24 20:30:19 +0100104#endif
105
Mark Rutlandcd1aebf2013-10-24 20:30:15 +0100106const struct cpu_operations cpu_psci_ops = {
Mark Rutland00ef54b2013-10-24 20:30:14 +0100107 .name = "psci",
Lorenzo Pieralisi18910ab2013-09-27 10:25:02 +0100108#ifdef CONFIG_CPU_IDLE
Lorenzo Pieralisi8b6f2492016-02-01 18:01:30 +0100109 .cpu_init_idle = psci_cpu_init_idle,
110 .cpu_suspend = psci_cpu_suspend_enter,
Lorenzo Pieralisi18910ab2013-09-27 10:25:02 +0100111#endif
Mark Rutlandcd1aebf2013-10-24 20:30:15 +0100112 .cpu_init = cpu_psci_cpu_init,
113 .cpu_prepare = cpu_psci_cpu_prepare,
Mark Rutland652af892013-10-24 20:30:16 +0100114 .cpu_boot = cpu_psci_cpu_boot,
Mark Rutland831ccf72013-10-24 20:30:19 +0100115#ifdef CONFIG_HOTPLUG_CPU
116 .cpu_disable = cpu_psci_cpu_disable,
117 .cpu_die = cpu_psci_cpu_die,
Ashwin Chaugulec814ca02014-05-07 10:18:36 -0400118 .cpu_kill = cpu_psci_cpu_kill,
Mark Rutland831ccf72013-10-24 20:30:19 +0100119#endif
Mark Rutland00ef54b2013-10-24 20:30:14 +0100120};
121