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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Intel SMP support routines.
+ *
+ * (c) 1995 Alan Cox, Building #3 <alan@lxorguk.ukuu.org.uk>
+ * (c) 1998-99, 2000, 2009 Ingo Molnar <mingo@redhat.com>
+ * (c) 2002,2003 Andi Kleen, SuSE Labs.
+ *
+ * i386 and x86_64 integration by Glauber Costa <gcosta@redhat.com>
+ */
+
+#include <linux/init.h>
+
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/export.h>
+#include <linux/kernel_stat.h>
+#include <linux/mc146818rtc.h>
+#include <linux/cache.h>
+#include <linux/interrupt.h>
+#include <linux/cpu.h>
+#include <linux/gfp.h>
+#include <linux/kexec.h>
+
+#include <asm/mtrr.h>
+#include <asm/tlbflush.h>
+#include <asm/mmu_context.h>
+#include <asm/proto.h>
+#include <asm/apic.h>
+#include <asm/cpu.h>
+#include <asm/idtentry.h>
+#include <asm/nmi.h>
+#include <asm/mce.h>
+#include <asm/trace/irq_vectors.h>
+#include <asm/kexec.h>
+#include <asm/reboot.h>
+
+/*
+ * Some notes on x86 processor bugs affecting SMP operation:
+ *
+ * Pentium, Pentium Pro, II, III (and all CPUs) have bugs.
+ * The Linux implications for SMP are handled as follows:
+ *
+ * Pentium III / [Xeon]
+ * None of the E1AP-E3AP errata are visible to the user.
+ *
+ * E1AP. see PII A1AP
+ * E2AP. see PII A2AP
+ * E3AP. see PII A3AP
+ *
+ * Pentium II / [Xeon]
+ * None of the A1AP-A3AP errata are visible to the user.
+ *
+ * A1AP. see PPro 1AP
+ * A2AP. see PPro 2AP
+ * A3AP. see PPro 7AP
+ *
+ * Pentium Pro
+ * None of 1AP-9AP errata are visible to the normal user,
+ * except occasional delivery of 'spurious interrupt' as trap #15.
+ * This is very rare and a non-problem.
+ *
+ * 1AP. Linux maps APIC as non-cacheable
+ * 2AP. worked around in hardware
+ * 3AP. fixed in C0 and above steppings microcode update.
+ * Linux does not use excessive STARTUP_IPIs.
+ * 4AP. worked around in hardware
+ * 5AP. symmetric IO mode (normal Linux operation) not affected.
+ * 'noapic' mode has vector 0xf filled out properly.
+ * 6AP. 'noapic' mode might be affected - fixed in later steppings
+ * 7AP. We do not assume writes to the LVT deasserting IRQs
+ * 8AP. We do not enable low power mode (deep sleep) during MP bootup
+ * 9AP. We do not use mixed mode
+ *
+ * Pentium
+ * There is a marginal case where REP MOVS on 100MHz SMP
+ * machines with B stepping processors can fail. XXX should provide
+ * an L1cache=Writethrough or L1cache=off option.
+ *
+ * B stepping CPUs may hang. There are hardware work arounds
+ * for this. We warn about it in case your board doesn't have the work
+ * arounds. Basically that's so I can tell anyone with a B stepping
+ * CPU and SMP problems "tough".
+ *
+ * Specific items [From Pentium Processor Specification Update]
+ *
+ * 1AP. Linux doesn't use remote read
+ * 2AP. Linux doesn't trust APIC errors
+ * 3AP. We work around this
+ * 4AP. Linux never generated 3 interrupts of the same priority
+ * to cause a lost local interrupt.
+ * 5AP. Remote read is never used
+ * 6AP. not affected - worked around in hardware
+ * 7AP. not affected - worked around in hardware
+ * 8AP. worked around in hardware - we get explicit CS errors if not
+ * 9AP. only 'noapic' mode affected. Might generate spurious
+ * interrupts, we log only the first one and count the
+ * rest silently.
+ * 10AP. not affected - worked around in hardware
+ * 11AP. Linux reads the APIC between writes to avoid this, as per
+ * the documentation. Make sure you preserve this as it affects
+ * the C stepping chips too.
+ * 12AP. not affected - worked around in hardware
+ * 13AP. not affected - worked around in hardware
+ * 14AP. we always deassert INIT during bootup
+ * 15AP. not affected - worked around in hardware
+ * 16AP. not affected - worked around in hardware
+ * 17AP. not affected - worked around in hardware
+ * 18AP. not affected - worked around in hardware
+ * 19AP. not affected - worked around in BIOS
+ *
+ * If this sounds worrying believe me these bugs are either ___RARE___,
+ * or are signal timing bugs worked around in hardware and there's
+ * about nothing of note with C stepping upwards.
+ */
+
+static atomic_t stopping_cpu = ATOMIC_INIT(-1);
+static bool smp_no_nmi_ipi = false;
+
+static int smp_stop_nmi_callback(unsigned int val, struct pt_regs *regs)
+{
+ /* We are registered on stopping cpu too, avoid spurious NMI */
+ if (raw_smp_processor_id() == atomic_read(&stopping_cpu))
+ return NMI_HANDLED;
+
+ cpu_emergency_disable_virtualization();
+ stop_this_cpu(NULL);
+
+ return NMI_HANDLED;
+}
+
+/*
+ * this function calls the 'stop' function on all other CPUs in the system.
+ */
+DEFINE_IDTENTRY_SYSVEC(sysvec_reboot)
+{
+ ack_APIC_irq();
+ cpu_emergency_disable_virtualization();
+ stop_this_cpu(NULL);
+}
+
+static int register_stop_handler(void)
+{
+ return register_nmi_handler(NMI_LOCAL, smp_stop_nmi_callback,
+ NMI_FLAG_FIRST, "smp_stop");
+}
+
+static void native_stop_other_cpus(int wait)
+{
+ unsigned int cpu = smp_processor_id();
+ unsigned long flags, timeout;
+
+ if (reboot_force)
+ return;
+
+ /* Only proceed if this is the first CPU to reach this code */
+ if (atomic_cmpxchg(&stopping_cpu, -1, cpu) != -1)
+ return;
+
+ /* For kexec, ensure that offline CPUs are out of MWAIT and in HLT */
+ if (kexec_in_progress)
+ smp_kick_mwait_play_dead();
+
+ /*
+ * 1) Send an IPI on the reboot vector to all other CPUs.
+ *
+ * The other CPUs should react on it after leaving critical
+ * sections and re-enabling interrupts. They might still hold
+ * locks, but there is nothing which can be done about that.
+ *
+ * 2) Wait for all other CPUs to report that they reached the
+ * HLT loop in stop_this_cpu()
+ *
+ * 3) If #2 timed out send an NMI to the CPUs which did not
+ * yet report
+ *
+ * 4) Wait for all other CPUs to report that they reached the
+ * HLT loop in stop_this_cpu()
+ *
+ * #3 can obviously race against a CPU reaching the HLT loop late.
+ * That CPU will have reported already and the "have all CPUs
+ * reached HLT" condition will be true despite the fact that the
+ * other CPU is still handling the NMI. Again, there is no
+ * protection against that as "disabled" APICs still respond to
+ * NMIs.
+ */
+ cpumask_copy(&cpus_stop_mask, cpu_online_mask);
+ cpumask_clear_cpu(cpu, &cpus_stop_mask);
+
+ if (!cpumask_empty(&cpus_stop_mask)) {
+ apic_send_IPI_allbutself(REBOOT_VECTOR);
+
+ /*
+ * Don't wait longer than a second for IPI completion. The
+ * wait request is not checked here because that would
+ * prevent an NMI shutdown attempt in case that not all
+ * CPUs reach shutdown state.
+ */
+ timeout = USEC_PER_SEC;
+ while (!cpumask_empty(&cpus_stop_mask) && timeout--)
+ udelay(1);
+ }
+
+ /* if the REBOOT_VECTOR didn't work, try with the NMI */
+ if (!cpumask_empty(&cpus_stop_mask)) {
+ /*
+ * If NMI IPI is enabled, try to register the stop handler
+ * and send the IPI. In any case try to wait for the other
+ * CPUs to stop.
+ */
+ if (!smp_no_nmi_ipi && !register_stop_handler()) {
+ pr_emerg("Shutting down cpus with NMI\n");
+
+ for_each_cpu(cpu, &cpus_stop_mask)
+ apic->send_IPI(cpu, NMI_VECTOR);
+ }
+ /*
+ * Don't wait longer than 10 ms if the caller didn't
+ * request it. If wait is true, the machine hangs here if
+ * one or more CPUs do not reach shutdown state.
+ */
+ timeout = USEC_PER_MSEC * 10;
+ while (!cpumask_empty(&cpus_stop_mask) && (wait || timeout--))
+ udelay(1);
+ }
+
+ local_irq_save(flags);
+ disable_local_APIC();
+ mcheck_cpu_clear(this_cpu_ptr(&cpu_info));
+ local_irq_restore(flags);
+
+ /*
+ * Ensure that the cpus_stop_mask cache lines are invalidated on
+ * the other CPUs. See comment vs. SME in stop_this_cpu().
+ */
+ cpumask_clear(&cpus_stop_mask);
+}
+
+/*
+ * Reschedule call back. KVM uses this interrupt to force a cpu out of
+ * guest mode.
+ */
+DEFINE_IDTENTRY_SYSVEC_SIMPLE(sysvec_reschedule_ipi)
+{
+ ack_APIC_irq();
+ trace_reschedule_entry(RESCHEDULE_VECTOR);
+ inc_irq_stat(irq_resched_count);
+ scheduler_ipi();
+ trace_reschedule_exit(RESCHEDULE_VECTOR);
+}
+
+DEFINE_IDTENTRY_SYSVEC(sysvec_call_function)
+{
+ ack_APIC_irq();
+ trace_call_function_entry(CALL_FUNCTION_VECTOR);
+ inc_irq_stat(irq_call_count);
+ generic_smp_call_function_interrupt();
+ trace_call_function_exit(CALL_FUNCTION_VECTOR);
+}
+
+DEFINE_IDTENTRY_SYSVEC(sysvec_call_function_single)
+{
+ ack_APIC_irq();
+ trace_call_function_single_entry(CALL_FUNCTION_SINGLE_VECTOR);
+ inc_irq_stat(irq_call_count);
+ generic_smp_call_function_single_interrupt();
+ trace_call_function_single_exit(CALL_FUNCTION_SINGLE_VECTOR);
+}
+
+static int __init nonmi_ipi_setup(char *str)
+{
+ smp_no_nmi_ipi = true;
+ return 1;
+}
+
+__setup("nonmi_ipi", nonmi_ipi_setup);
+
+struct smp_ops smp_ops = {
+ .smp_prepare_boot_cpu = native_smp_prepare_boot_cpu,
+ .smp_prepare_cpus = native_smp_prepare_cpus,
+ .smp_cpus_done = native_smp_cpus_done,
+
+ .stop_other_cpus = native_stop_other_cpus,
+#if defined(CONFIG_KEXEC_CORE)
+ .crash_stop_other_cpus = kdump_nmi_shootdown_cpus,
+#endif
+ .smp_send_reschedule = native_smp_send_reschedule,
+
+ .cpu_up = native_cpu_up,
+ .cpu_die = native_cpu_die,
+ .cpu_disable = native_cpu_disable,
+ .play_dead = native_play_dead,
+
+ .send_call_func_ipi = native_send_call_func_ipi,
+ .send_call_func_single_ipi = native_send_call_func_single_ipi,
+};
+EXPORT_SYMBOL_GPL(smp_ops);