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287 lines
6.8 KiB
287 lines
6.8 KiB
// 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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if (!xen_fifo_events) { |
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debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu); |
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rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, |
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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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} |
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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 = remove_cpu(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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