1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
4 */
5
6#include <linux/kvm_host.h>
7#include <trace/events/kvm.h>
8#include "intc/ls7a_irq.h"
9
10static int kvm_ls7a_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
11					struct kvm *kvm, int irq_source_id,
12					int level, bool line_status)
13{
14	/* ioapic pin (0 ~ 64) <---> gsi(0 ~ 64) */
15	u32 irq = e->irqchip.pin;
16	unsigned long flags;
17	int ret;
18
19	if (!ls7a_ioapic_in_kernel(kvm))
20		return -ENXIO;
21
22	ls7a_ioapic_lock(ls7a_ioapic_irqchip(kvm), &flags);
23	ret = kvm_ls7a_ioapic_set_irq(kvm, irq, level);
24	ls7a_ioapic_unlock(ls7a_ioapic_irqchip(kvm), &flags);
25
26	return ret;
27}
28
29/**
30 * kvm_set_routing_entry: populate a kvm routing entry
31 * from a user routing entry
32 *
33 * @kvm: the VM this entry is applied to
34 * @e: kvm kernel routing entry handle
35 * @ue: user api routing entry handle
36 * return 0 on success, -EINVAL on errors.
37 */
38int kvm_set_routing_entry(struct kvm *kvm,
39			  struct kvm_kernel_irq_routing_entry *e,
40			  const struct kvm_irq_routing_entry *ue)
41{
42	int r = -EINVAL;
43
44	switch (ue->type) {
45	case KVM_IRQ_ROUTING_IRQCHIP:
46		e->set = kvm_ls7a_set_ioapic_irq;
47
48		e->irqchip.irqchip = ue->u.irqchip.irqchip;
49		e->irqchip.pin = ue->u.irqchip.pin;
50
51		if (e->irqchip.pin >= LS7A_APIC_NUM_PINS)
52			goto out;
53		break;
54	case KVM_IRQ_ROUTING_MSI:
55		e->set = kvm_set_msi;
56		e->msi.address_lo = ue->u.msi.address_lo;
57		e->msi.address_hi = ue->u.msi.address_hi;
58		e->msi.data = ue->u.msi.data;
59		/*
60		 * linux4.19 kernel have flags and devid
61		 * e->msi.flags = ue->flags;
62		 * e->msi.devid = ue->u.msi.devid;
63		 */
64		break;
65	default:
66		goto out;
67	}
68	r = 0;
69out:
70	return r;
71}
72
73int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
74		struct kvm *kvm, int irq_source_id,
75		int level, bool line_status)
76{
77	if (e->type == KVM_IRQ_ROUTING_MSI)
78		return kvm_ls7a_set_msi(e, kvm, irq_source_id, 1, false);
79
80	return -EWOULDBLOCK;
81}
82
83/**
84 * kvm_set_msi: inject the MSI corresponding to the
85 * MSI routing entry
86 *
87 * This is the entry point for irqfd MSI injection
88 * and userspace MSI injection.
89 */
90int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
91		struct kvm *kvm, int irq_source_id,
92		int level, bool line_status)
93{
94	unsigned int ret;
95
96	if (!level)
97		return -1;
98
99	ret = kvm_ls7a_set_msi(e, kvm, irq_source_id, 1, false);
100	return ret;
101}
102
103int kvm_ls7a_setup_default_irq_routing(struct kvm *kvm)
104{
105	struct kvm_irq_routing_entry *entries;
106
107	u32 nr = LS7A_APIC_NUM_PINS;
108	int i, ret;
109
110	entries = kcalloc(nr, sizeof(*entries), GFP_KERNEL);
111	if (!entries)
112		return -ENOMEM;
113
114	for (i = 0; i < nr; i++) {
115		entries[i].gsi = i;
116		entries[i].type = KVM_IRQ_ROUTING_IRQCHIP;
117		entries[i].u.irqchip.irqchip = 0;
118		entries[i].u.irqchip.pin = i;
119	}
120	ret = kvm_set_irq_routing(kvm, entries, nr, 0);
121	kfree(entries);
122
123	return 0;
124}
125