mirror of
https://github.com/torvalds/linux
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2711b8e2b7
The new AP state tracking and synchronization mechanism in the CPU hotplug core code allows to remove quite some x86 specific code: 1) The AP alive synchronization based on cpumasks 2) The decision whether an AP can be brought up again Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Michael Kelley <mikelley@microsoft.com> Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name> Tested-by: Helge Deller <deller@gmx.de> # parisc Tested-by: Guilherme G. Piccoli <gpiccoli@igalia.com> # Steam Deck Link: https://lore.kernel.org/r/20230512205256.529657366@linutronix.de
91 lines
2 KiB
C
91 lines
2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/thread_info.h>
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#include <asm/smp.h>
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#include <xen/events.h>
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#include "xen-ops.h"
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#include "smp.h"
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static void __init xen_hvm_smp_prepare_boot_cpu(void)
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{
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BUG_ON(smp_processor_id() != 0);
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native_smp_prepare_boot_cpu();
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/*
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* Setup vcpu_info for boot CPU. Secondary CPUs get their vcpu_info
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* in xen_cpu_up_prepare_hvm().
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*/
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xen_vcpu_setup(0);
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/*
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* Called again in case the kernel boots on vcpu >= MAX_VIRT_CPUS.
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* Refer to comments in xen_hvm_init_time_ops().
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*/
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xen_hvm_init_time_ops();
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/*
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* The alternative logic (which patches the unlock/lock) runs before
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* the smp bootup up code is activated. Hence we need to set this up
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* the core kernel is being patched. Otherwise we will have only
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* modules patched but not core code.
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*/
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xen_init_spinlocks();
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}
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static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
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{
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int cpu;
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native_smp_prepare_cpus(max_cpus);
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if (xen_have_vector_callback) {
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WARN_ON(xen_smp_intr_init(0));
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xen_init_lock_cpu(0);
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}
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for_each_possible_cpu(cpu) {
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if (cpu == 0)
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continue;
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/* Set default vcpu_id to make sure that we don't use cpu-0's */
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per_cpu(xen_vcpu_id, cpu) = XEN_VCPU_ID_INVALID;
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}
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}
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#ifdef CONFIG_HOTPLUG_CPU
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static void xen_hvm_cleanup_dead_cpu(unsigned int cpu)
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{
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if (xen_have_vector_callback) {
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xen_smp_intr_free(cpu);
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xen_uninit_lock_cpu(cpu);
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xen_teardown_timer(cpu);
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}
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}
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#else
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static void xen_hvm_cleanup_dead_cpu(unsigned int cpu)
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{
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BUG();
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}
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#endif
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void __init xen_hvm_smp_init(void)
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{
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smp_ops.smp_prepare_boot_cpu = xen_hvm_smp_prepare_boot_cpu;
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smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
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smp_ops.smp_cpus_done = xen_smp_cpus_done;
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smp_ops.cleanup_dead_cpu = xen_hvm_cleanup_dead_cpu;
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if (!xen_have_vector_callback) {
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#ifdef CONFIG_PARAVIRT_SPINLOCKS
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nopvspin = true;
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#endif
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return;
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}
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smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
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smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
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smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
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}
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