// SPDX-License-Identifier: GPL-2.0
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#include <linux/smp.h>
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#include <linux/cpu.h>
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#include <linux/slab.h>
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#include <linux/cpumask.h>
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#include <linux/percpu.h>
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#include <xen/events.h>
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#include <xen/hvc-console.h>
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#include "xen-ops.h"
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#include "smp.h"
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static DEFINE_PER_CPU(struct xen_common_irq, xen_resched_irq) = { .irq = -1 };
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static DEFINE_PER_CPU(struct xen_common_irq, xen_callfunc_irq) = { .irq = -1 };
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static DEFINE_PER_CPU(struct xen_common_irq, xen_callfuncsingle_irq) = { .irq = -1 };
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static DEFINE_PER_CPU(struct xen_common_irq, xen_debug_irq) = { .irq = -1 };
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static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
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static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);
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/*
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* Reschedule call back.
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*/
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static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id)
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{
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inc_irq_stat(irq_resched_count);
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scheduler_ipi();
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return IRQ_HANDLED;
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}
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void xen_smp_intr_free(unsigned int cpu)
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{
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if (per_cpu(xen_resched_irq, cpu).irq >= 0) {
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unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu).irq, NULL);
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per_cpu(xen_resched_irq, cpu).irq = -1;
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kfree(per_cpu(xen_resched_irq, cpu).name);
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per_cpu(xen_resched_irq, cpu).name = NULL;
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}
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if (per_cpu(xen_callfunc_irq, cpu).irq >= 0) {
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unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu).irq, NULL);
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per_cpu(xen_callfunc_irq, cpu).irq = -1;
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kfree(per_cpu(xen_callfunc_irq, cpu).name);
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per_cpu(xen_callfunc_irq, cpu).name = NULL;
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}
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if (per_cpu(xen_debug_irq, cpu).irq >= 0) {
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unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu).irq, NULL);
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per_cpu(xen_debug_irq, cpu).irq = -1;
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kfree(per_cpu(xen_debug_irq, cpu).name);
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per_cpu(xen_debug_irq, cpu).name = NULL;
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}
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if (per_cpu(xen_callfuncsingle_irq, cpu).irq >= 0) {
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unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu).irq,
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NULL);
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per_cpu(xen_callfuncsingle_irq, cpu).irq = -1;
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kfree(per_cpu(xen_callfuncsingle_irq, cpu).name);
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per_cpu(xen_callfuncsingle_irq, cpu).name = NULL;
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}
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}
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int xen_smp_intr_init(unsigned int cpu)
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{
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int rc;
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char *resched_name, *callfunc_name, *debug_name;
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resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
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rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
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cpu,
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xen_reschedule_interrupt,
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IRQF_PERCPU|IRQF_NOBALANCING,
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resched_name,
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NULL);
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if (rc < 0)
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goto fail;
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per_cpu(xen_resched_irq, cpu).irq = rc;
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per_cpu(xen_resched_irq, cpu).name = resched_name;
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callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu);
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rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR,
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cpu,
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xen_call_function_interrupt,
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IRQF_PERCPU|IRQF_NOBALANCING,
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callfunc_name,
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NULL);
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if (rc < 0)
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goto fail;
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per_cpu(xen_callfunc_irq, cpu).irq = rc;
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per_cpu(xen_callfunc_irq, cpu).name = callfunc_name;
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debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
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rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt,
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IRQF_PERCPU | IRQF_NOBALANCING,
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debug_name, NULL);
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if (rc < 0)
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goto fail;
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per_cpu(xen_debug_irq, cpu).irq = rc;
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per_cpu(xen_debug_irq, cpu).name = debug_name;
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callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu);
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rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR,
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cpu,
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xen_call_function_single_interrupt,
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IRQF_PERCPU|IRQF_NOBALANCING,
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callfunc_name,
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NULL);
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if (rc < 0)
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goto fail;
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per_cpu(xen_callfuncsingle_irq, cpu).irq = rc;
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per_cpu(xen_callfuncsingle_irq, cpu).name = callfunc_name;
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return 0;
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fail:
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xen_smp_intr_free(cpu);
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return rc;
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}
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void __init xen_smp_cpus_done(unsigned int max_cpus)
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{
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int cpu, rc, count = 0;
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if (xen_hvm_domain())
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native_smp_cpus_done(max_cpus);
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else
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calculate_max_logical_packages();
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if (xen_have_vcpu_info_placement)
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return;
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for_each_online_cpu(cpu) {
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if (xen_vcpu_nr(cpu) < MAX_VIRT_CPUS)
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continue;
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rc = cpu_down(cpu);
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if (rc == 0) {
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/*
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* Reset vcpu_info so this cpu cannot be onlined again.
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*/
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xen_vcpu_info_reset(cpu);
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count++;
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} else {
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pr_warn("%s: failed to bring CPU %d down, error %d\n",
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__func__, cpu, rc);
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}
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}
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WARN(count, "%s: brought %d CPUs offline\n", __func__, count);
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}
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void xen_smp_send_reschedule(int cpu)
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{
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xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
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}
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static void __xen_send_IPI_mask(const struct cpumask *mask,
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int vector)
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{
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unsigned cpu;
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for_each_cpu_and(cpu, mask, cpu_online_mask)
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xen_send_IPI_one(cpu, vector);
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}
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void xen_smp_send_call_function_ipi(const struct cpumask *mask)
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{
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int cpu;
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__xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
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/* Make sure other vcpus get a chance to run if they need to. */
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for_each_cpu(cpu, mask) {
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if (xen_vcpu_stolen(cpu)) {
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HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
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break;
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}
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}
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}
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void xen_smp_send_call_function_single_ipi(int cpu)
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{
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__xen_send_IPI_mask(cpumask_of(cpu),
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XEN_CALL_FUNCTION_SINGLE_VECTOR);
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}
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static inline int xen_map_vector(int vector)
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{
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int xen_vector;
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switch (vector) {
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case RESCHEDULE_VECTOR:
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xen_vector = XEN_RESCHEDULE_VECTOR;
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break;
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case CALL_FUNCTION_VECTOR:
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xen_vector = XEN_CALL_FUNCTION_VECTOR;
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break;
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case CALL_FUNCTION_SINGLE_VECTOR:
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xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR;
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break;
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case IRQ_WORK_VECTOR:
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xen_vector = XEN_IRQ_WORK_VECTOR;
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break;
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#ifdef CONFIG_X86_64
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case NMI_VECTOR:
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case APIC_DM_NMI: /* Some use that instead of NMI_VECTOR */
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xen_vector = XEN_NMI_VECTOR;
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break;
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#endif
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default:
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xen_vector = -1;
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printk(KERN_ERR "xen: vector 0x%x is not implemented\n",
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vector);
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}
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return xen_vector;
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}
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void xen_send_IPI_mask(const struct cpumask *mask,
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int vector)
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{
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int xen_vector = xen_map_vector(vector);
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if (xen_vector >= 0)
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__xen_send_IPI_mask(mask, xen_vector);
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}
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void xen_send_IPI_all(int vector)
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{
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int xen_vector = xen_map_vector(vector);
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if (xen_vector >= 0)
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__xen_send_IPI_mask(cpu_online_mask, xen_vector);
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}
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void xen_send_IPI_self(int vector)
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{
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int xen_vector = xen_map_vector(vector);
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if (xen_vector >= 0)
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xen_send_IPI_one(smp_processor_id(), xen_vector);
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}
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void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
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int vector)
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{
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unsigned cpu;
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unsigned int this_cpu = smp_processor_id();
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int xen_vector = xen_map_vector(vector);
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if (!(num_online_cpus() > 1) || (xen_vector < 0))
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return;
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for_each_cpu_and(cpu, mask, cpu_online_mask) {
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if (this_cpu == cpu)
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continue;
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xen_send_IPI_one(cpu, xen_vector);
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}
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}
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void xen_send_IPI_allbutself(int vector)
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{
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xen_send_IPI_mask_allbutself(cpu_online_mask, vector);
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}
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static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
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{
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irq_enter();
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generic_smp_call_function_interrupt();
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inc_irq_stat(irq_call_count);
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irq_exit();
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return IRQ_HANDLED;
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}
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static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
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{
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irq_enter();
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generic_smp_call_function_single_interrupt();
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inc_irq_stat(irq_call_count);
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irq_exit();
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return IRQ_HANDLED;
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}
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