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
10static 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 */
26int 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 */
46int 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
71int 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
86bool kvm_arch_intc_initialized(struct kvm *kvm)
87{
88	return kvm_arch_irqchip_in_kernel(kvm);
89}