2077be6783
__pa_symbol is technically the marcro that should be used for kernel symbols. Switch to this as a pre-requisite for DEBUG_VIRTUAL which will do bounds checking. Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Laura Abbott <labbott@redhat.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
129 lines
2.9 KiB
C
129 lines
2.9 KiB
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
#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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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;
|
|
}
|
|
#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
|
|
};
|
|
|