arch/loongarch/kvm/irqfd.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2024 Loongson Technology Corporation Limited
   4  */
   5
   6 #include <linux/kvm_host.h>
   7 #include <trace/events/kvm.h>
   8 #include <asm/kvm_pch_pic.h>
   9
  10 static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
  11                 struct kvm *kvm, int irq_source_id, int level, bool line_status)
  12 {
  13         /* PCH-PIC pin (0 ~ 64) <---> GSI (0 ~ 64) */
  14         pch_pic_set_irq(kvm->arch.pch_pic, e->irqchip.pin, level);
  15
  16         return 0;
  17 }
  18
  19 /*
  20  * kvm_set_msi: inject the MSI corresponding to the
  21  * MSI routing entry
  22  *
  23  * This is the entry point for irqfd MSI injection
  24  * and userspace MSI injection.
  25  */
  26 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
  27                 struct kvm *kvm, int irq_source_id, int level, bool line_status)
  28 {
  29         if (!level)
  30                 return -1;
  31
  32         pch_msi_set_irq(kvm, e->msi.data, level);
  33
  34         return 0;
  35 }
  36
  37 /*
  38  * kvm_set_routing_entry: populate a kvm routing entry
  39  * from a user routing entry
  40  *
  41  * @kvm: the VM this entry is applied to
  42  * @e: kvm kernel routing entry handle
  43  * @ue: user api routing entry handle
  44  * return 0 on success, -EINVAL on errors.
  45  */
  46 int kvm_set_routing_entry(struct kvm *kvm,
  47                         struct kvm_kernel_irq_routing_entry *e,
  48                         const struct kvm_irq_routing_entry *ue)
  49 {
  50         switch (ue->type) {
  51         case KVM_IRQ_ROUTING_IRQCHIP:
  52                 e->set = kvm_set_pic_irq;
  53                 e->irqchip.irqchip = ue->u.irqchip.irqchip;
  54                 e->irqchip.pin = ue->u.irqchip.pin;
  55
  56                 if (e->irqchip.pin >= KVM_IRQCHIP_NUM_PINS)
  57                         return -EINVAL;
  58
  59                 return 0;
  60         case KVM_IRQ_ROUTING_MSI:
  61                 e->set = kvm_set_msi;
  62                 e->msi.address_lo = ue->u.msi.address_lo;
  63                 e->msi.address_hi = ue->u.msi.address_hi;
  64                 e->msi.data = ue->u.msi.data;
  65                 return 0;
  66         default:
  67                 return -EINVAL;
  68         }
  69 }
  70
  71 int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
  72                 struct kvm *kvm, int irq_source_id, int level, bool line_status)
  73 {
  74         switch (e->type) {
  75         case KVM_IRQ_ROUTING_IRQCHIP:
  76                 pch_pic_set_irq(kvm->arch.pch_pic, e->irqchip.pin, level);
  77                 return 0;
  78         case KVM_IRQ_ROUTING_MSI:
  79                 pch_msi_set_irq(kvm, e->msi.data, level);
  80                 return 0;
  81         default:
  82                 return -EWOULDBLOCK;
  83         }
  84 }
  85
  86 bool kvm_arch_intc_initialized(struct kvm *kvm)
  87 {
  88         return kvm_arch_irqchip_in_kernel(kvm);
  89 }