53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/smp.h>
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#include "smc.h"
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static int tango_boot_secondary(unsigned int cpu, struct task_struct *idle)
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{
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tango_set_aux_boot_addr(__pa_symbol(secondary_startup));
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tango_start_aux_core(cpu);
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return 0;
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}
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#ifdef CONFIG_HOTPLUG_CPU
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/*
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* cpu_kill() and cpu_die() run concurrently on different cores.
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* Firmware will only "kill" a core once it has properly "died".
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* Try a few times to kill a core before giving up, and sleep
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* between tries to give that core enough time to die.
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*/
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static int tango_cpu_kill(unsigned int cpu)
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{
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int i, err;
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for (i = 0; i < 10; ++i) {
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msleep(10);
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err = tango_aux_core_kill(cpu);
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if (!err)
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return true;
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}
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return false;
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}
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static void tango_cpu_die(unsigned int cpu)
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{
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while (tango_aux_core_die(cpu) < 0)
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cpu_relax();
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panic("cpu %d failed to die\n", cpu);
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}
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#endif
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static const struct smp_operations tango_smp_ops __initconst = {
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.smp_boot_secondary = tango_boot_secondary,
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#ifdef CONFIG_HOTPLUG_CPU
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.cpu_kill = tango_cpu_kill,
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.cpu_die = tango_cpu_die,
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#endif
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};
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CPU_METHOD_OF_DECLARE(tango4_smp, "sigma,tango4-smp", &tango_smp_ops);
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