162306a36Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0 262306a36Sopenharmony_ci#include <linux/hardirq.h> 362306a36Sopenharmony_ci 462306a36Sopenharmony_ci#include <asm/x86_init.h> 562306a36Sopenharmony_ci 662306a36Sopenharmony_ci#include <xen/interface/xen.h> 762306a36Sopenharmony_ci#include <xen/interface/sched.h> 862306a36Sopenharmony_ci#include <xen/interface/vcpu.h> 962306a36Sopenharmony_ci#include <xen/features.h> 1062306a36Sopenharmony_ci#include <xen/events.h> 1162306a36Sopenharmony_ci 1262306a36Sopenharmony_ci#include <asm/xen/hypercall.h> 1362306a36Sopenharmony_ci#include <asm/xen/hypervisor.h> 1462306a36Sopenharmony_ci 1562306a36Sopenharmony_ci#include "xen-ops.h" 1662306a36Sopenharmony_ci 1762306a36Sopenharmony_ci/* 1862306a36Sopenharmony_ci * Force a proper event-channel callback from Xen after clearing the 1962306a36Sopenharmony_ci * callback mask. We do this in a very simple manner, by making a call 2062306a36Sopenharmony_ci * down into Xen. The pending flag will be checked by Xen on return. 2162306a36Sopenharmony_ci */ 2262306a36Sopenharmony_cinoinstr void xen_force_evtchn_callback(void) 2362306a36Sopenharmony_ci{ 2462306a36Sopenharmony_ci (void)HYPERVISOR_xen_version(0, NULL); 2562306a36Sopenharmony_ci} 2662306a36Sopenharmony_ci 2762306a36Sopenharmony_cistatic noinstr void xen_safe_halt(void) 2862306a36Sopenharmony_ci{ 2962306a36Sopenharmony_ci /* Blocking includes an implicit local_irq_enable(). */ 3062306a36Sopenharmony_ci if (HYPERVISOR_sched_op(SCHEDOP_block, NULL) != 0) 3162306a36Sopenharmony_ci BUG(); 3262306a36Sopenharmony_ci} 3362306a36Sopenharmony_ci 3462306a36Sopenharmony_cistatic void xen_halt(void) 3562306a36Sopenharmony_ci{ 3662306a36Sopenharmony_ci if (irqs_disabled()) 3762306a36Sopenharmony_ci HYPERVISOR_vcpu_op(VCPUOP_down, 3862306a36Sopenharmony_ci xen_vcpu_nr(smp_processor_id()), NULL); 3962306a36Sopenharmony_ci else 4062306a36Sopenharmony_ci xen_safe_halt(); 4162306a36Sopenharmony_ci} 4262306a36Sopenharmony_ci 4362306a36Sopenharmony_cistatic const typeof(pv_ops) xen_irq_ops __initconst = { 4462306a36Sopenharmony_ci .irq = { 4562306a36Sopenharmony_ci /* Initial interrupt flag handling only called while interrupts off. */ 4662306a36Sopenharmony_ci .save_fl = __PV_IS_CALLEE_SAVE(paravirt_ret0), 4762306a36Sopenharmony_ci .irq_disable = __PV_IS_CALLEE_SAVE(paravirt_nop), 4862306a36Sopenharmony_ci .irq_enable = __PV_IS_CALLEE_SAVE(paravirt_BUG), 4962306a36Sopenharmony_ci 5062306a36Sopenharmony_ci .safe_halt = xen_safe_halt, 5162306a36Sopenharmony_ci .halt = xen_halt, 5262306a36Sopenharmony_ci }, 5362306a36Sopenharmony_ci}; 5462306a36Sopenharmony_ci 5562306a36Sopenharmony_civoid __init xen_init_irq_ops(void) 5662306a36Sopenharmony_ci{ 5762306a36Sopenharmony_ci pv_ops.irq = xen_irq_ops.irq; 5862306a36Sopenharmony_ci x86_init.irqs.intr_init = xen_init_IRQ; 5962306a36Sopenharmony_ci} 60