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52 lines
1.2 KiB
52 lines
1.2 KiB
// 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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