Release 4.14 arch/arm64/kernel/psci.c

/*
 * 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.
 *
 * Copyright (C) 2013 ARM Limited
 *
 * Author: Will Deacon <will.deacon@arm.com>
 */


#define pr_fmt(fmt) "psci: " fmt

#include <linux/init.h>
#include <linux/of.h>
#include <linux/smp.h>
#include <linux/delay.h>
#include <linux/psci.h>
#include <linux/mm.h>

#include <uapi/linux/psci.h>

#include <asm/compiler.h>
#include <asm/cpu_ops.h>
#include <asm/errno.h>
#include <asm/smp_plat.h>



static int __init cpu_psci_cpu_init(unsigned int cpu)
{
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mark Rutland
14
100.00%
2
100.00%
Total
14
100.00%
2
100.00%



static int __init cpu_psci_cpu_prepare(unsigned int cpu)
{
	if (!psci_ops.cpu_on) {
		pr_err("no cpu_on method, not booting CPU%d\n", cpu);
		return -ENODEV;
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mark Rutland
34
100.00%
3
100.00%
Total
34
100.00%
3
100.00%



static int cpu_psci_cpu_boot(unsigned int cpu)
{
	int err = psci_ops.cpu_on(cpu_logical_map(cpu), __pa_symbol(secondary_entry));
	if (err)
		pr_err("failed to boot CPU%d (%d)\n", cpu, err);

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mark Rutland
42
95.45%
2
50.00%
Vladimir Murzin
1
2.27%
1
25.00%
Laura Abbott
1
2.27%
1
25.00%
Total
44
100.00%
4
100.00%

#ifdef CONFIG_HOTPLUG_CPU


static int cpu_psci_cpu_disable(unsigned int cpu)
{
	/* Fail early if we don't have CPU_OFF support */
	if (!psci_ops.cpu_off)
		return -EOPNOTSUPP;

	/* Trusted OS will deny CPU_OFF */
	if (psci_tos_resident_on(cpu))
		return -EPERM;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mark Rutland
37
100.00%
2
100.00%
Total
37
100.00%
2
100.00%



static void cpu_psci_cpu_die(unsigned int cpu)
{
	int ret;
	/*
         * There are no known implementations of PSCI actually using the
         * power state field, pass a sensible default for now.
         */
	u32 state = PSCI_POWER_STATE_TYPE_POWER_DOWN <<
		    PSCI_0_2_POWER_STATE_TYPE_SHIFT;

	ret = psci_ops.cpu_off(state);

	pr_crit("unable to power off CPU%u (%d)\n", cpu, ret);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mark Rutland
38
97.44%
2
66.67%
Vladimir Murzin
1
2.56%
1
33.33%
Total
39
100.00%
3
100.00%



static int cpu_psci_cpu_kill(unsigned int cpu)
{
	int err, i;

	if (!psci_ops.affinity_info)
		return 0;
	/*
         * cpu_kill could race with cpu_die and we can
         * potentially end up declaring this cpu undead
         * while it is dying. So, try again a few times.
         */

	for (i = 0; i < 10; i++) {
		err = psci_ops.affinity_info(cpu_logical_map(cpu), 0);
		if (err == PSCI_0_2_AFFINITY_LEVEL_OFF) {
			pr_info("CPU%d killed.\n", cpu);
			return 0;
		}

		msleep(10);
		pr_info("Retrying again to check for CPU kill\n");
	}

	pr_warn("CPU%d may not have shut down cleanly (AFFINITY_INFO reports %d)\n",
			cpu, err);
	return -ETIMEDOUT;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Ashwin Chaugule
92
95.83%
1
50.00%
Mark Rutland
4
4.17%
1
50.00%
Total
96
100.00%
2
100.00%

#endif


const struct cpu_operations cpu_psci_ops = {
	.name		= "psci",
#ifdef CONFIG_CPU_IDLE
	.cpu_init_idle	= psci_cpu_init_idle,
	.cpu_suspend	= psci_cpu_suspend_enter,
#endif
	.cpu_init	= cpu_psci_cpu_init,
	.cpu_prepare	= cpu_psci_cpu_prepare,
	.cpu_boot	= cpu_psci_cpu_boot,
#ifdef CONFIG_HOTPLUG_CPU
	.cpu_disable	= cpu_psci_cpu_disable,
	.cpu_die	= cpu_psci_cpu_die,
	.cpu_kill	= cpu_psci_cpu_kill,
#endif
};

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Mark Rutland
226
60.59%
8
50.00%
Ashwin Chaugule
104
27.88%
2
12.50%
Will Deacon
22
5.90%
1
6.25%
Lorenzo Pieralisi
15
4.02%
3
18.75%
Laura Abbott
4
1.07%
1
6.25%
Vladimir Murzin
2
0.54%
1
6.25%
Total
373
100.00%
16
100.00%
Directory: arch/arm64/kernel

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.