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