https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd authored by Linus Torvalds on 06 May 2019, 00:42:58 UTC
Linux 5.1
Linux 5.1
Tip revision: e93c9c9
platsmp.c
// SPDX-License-Identifier: GPL-2.0
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/smp.h>
#include "smc.h"
static int tango_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
tango_set_aux_boot_addr(__pa_symbol(secondary_startup));
tango_start_aux_core(cpu);
return 0;
}
#ifdef CONFIG_HOTPLUG_CPU
/*
* cpu_kill() and cpu_die() run concurrently on different cores.
* Firmware will only "kill" a core once it has properly "died".
* Try a few times to kill a core before giving up, and sleep
* between tries to give that core enough time to die.
*/
static int tango_cpu_kill(unsigned int cpu)
{
int i, err;
for (i = 0; i < 10; ++i) {
msleep(10);
err = tango_aux_core_kill(cpu);
if (!err)
return true;
}
return false;
}
static void tango_cpu_die(unsigned int cpu)
{
while (tango_aux_core_die(cpu) < 0)
cpu_relax();
panic("cpu %d failed to die\n", cpu);
}
#endif
static const struct smp_operations tango_smp_ops __initconst = {
.smp_boot_secondary = tango_boot_secondary,
#ifdef CONFIG_HOTPLUG_CPU
.cpu_kill = tango_cpu_kill,
.cpu_die = tango_cpu_die,
#endif
};
CPU_METHOD_OF_DECLARE(tango4_smp, "sigma,tango4-smp", &tango_smp_ops);