1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * LoongArch EXTIOI interrupt kvm support
4 *
5 * Copyright (C) 2025 Loongson Technology Corporation Limited
6 */
7
8 #include "qemu/osdep.h"
9 #include "qemu/typedefs.h"
10 #include "hw/intc/loongarch_extioi.h"
11 #include "linux/kvm.h"
12 #include "qapi/error.h"
13 #include "system/kvm.h"
14
kvm_extioi_access_reg(int fd,uint64_t addr,void * val,bool write)15 static void kvm_extioi_access_reg(int fd, uint64_t addr, void *val, bool write)
16 {
17 kvm_device_access(fd, KVM_DEV_LOONGARCH_EXTIOI_GRP_REGS,
18 addr, val, write, &error_abort);
19 }
20
kvm_extioi_access_sw_state(int fd,uint64_t addr,void * val,bool write)21 static void kvm_extioi_access_sw_state(int fd, uint64_t addr,
22 void *val, bool write)
23 {
24 kvm_device_access(fd, KVM_DEV_LOONGARCH_EXTIOI_GRP_SW_STATUS,
25 addr, val, write, &error_abort);
26 }
27
kvm_extioi_access_sw_status(void * opaque,bool write)28 static void kvm_extioi_access_sw_status(void *opaque, bool write)
29 {
30 LoongArchExtIOICommonState *lecs = LOONGARCH_EXTIOI_COMMON(opaque);
31 LoongArchExtIOIState *les = LOONGARCH_EXTIOI(opaque);
32 int addr;
33
34 addr = KVM_DEV_LOONGARCH_EXTIOI_SW_STATUS_STATE;
35 kvm_extioi_access_sw_state(les->dev_fd, addr, &lecs->status, write);
36 }
37
kvm_extioi_access_regs(void * opaque,bool write)38 static void kvm_extioi_access_regs(void *opaque, bool write)
39 {
40 LoongArchExtIOICommonState *lecs = LOONGARCH_EXTIOI_COMMON(opaque);
41 LoongArchExtIOIState *les = LOONGARCH_EXTIOI(opaque);
42 int fd = les->dev_fd;
43 int addr, offset, cpu;
44
45 for (addr = EXTIOI_NODETYPE_START; addr < EXTIOI_NODETYPE_END; addr += 4) {
46 offset = (addr - EXTIOI_NODETYPE_START) / 4;
47 kvm_extioi_access_reg(fd, addr, &lecs->nodetype[offset], write);
48 }
49
50 for (addr = EXTIOI_IPMAP_START; addr < EXTIOI_IPMAP_END; addr += 4) {
51 offset = (addr - EXTIOI_IPMAP_START) / 4;
52 kvm_extioi_access_reg(fd, addr, &lecs->ipmap[offset], write);
53 }
54
55 for (addr = EXTIOI_ENABLE_START; addr < EXTIOI_ENABLE_END; addr += 4) {
56 offset = (addr - EXTIOI_ENABLE_START) / 4;
57 kvm_extioi_access_reg(fd, addr, &lecs->enable[offset], write);
58 }
59
60 for (addr = EXTIOI_BOUNCE_START; addr < EXTIOI_BOUNCE_END; addr += 4) {
61 offset = (addr - EXTIOI_BOUNCE_START) / 4;
62 kvm_extioi_access_reg(fd, addr, &lecs->bounce[offset], write);
63 }
64
65 for (addr = EXTIOI_ISR_START; addr < EXTIOI_ISR_END; addr += 4) {
66 offset = (addr - EXTIOI_ISR_START) / 4;
67 kvm_extioi_access_reg(fd, addr, &lecs->isr[offset], write);
68 }
69
70 for (addr = EXTIOI_COREMAP_START; addr < EXTIOI_COREMAP_END; addr += 4) {
71 offset = (addr - EXTIOI_COREMAP_START) / 4;
72 kvm_extioi_access_reg(fd, addr, &lecs->coremap[offset], write);
73 }
74
75 for (cpu = 0; cpu < lecs->num_cpu; cpu++) {
76 for (addr = EXTIOI_COREISR_START;
77 addr < EXTIOI_COREISR_END; addr += 4) {
78 offset = (addr - EXTIOI_COREISR_START) / 4;
79 kvm_extioi_access_reg(fd, (cpu << 16) | addr,
80 &lecs->cpu[cpu].coreisr[offset], write);
81 }
82 }
83 }
84
kvm_extioi_get(void * opaque)85 int kvm_extioi_get(void *opaque)
86 {
87 kvm_extioi_access_regs(opaque, false);
88 kvm_extioi_access_sw_status(opaque, false);
89 return 0;
90 }
91
kvm_extioi_put(void * opaque,int version_id)92 int kvm_extioi_put(void *opaque, int version_id)
93 {
94 LoongArchExtIOIState *les = LOONGARCH_EXTIOI(opaque);
95 int fd = les->dev_fd;
96
97 if (fd == 0) {
98 return 0;
99 }
100
101 kvm_extioi_access_regs(opaque, true);
102 kvm_extioi_access_sw_status(opaque, true);
103 kvm_device_access(fd, KVM_DEV_LOONGARCH_EXTIOI_GRP_CTRL,
104 KVM_DEV_LOONGARCH_EXTIOI_CTRL_LOAD_FINISHED,
105 NULL, true, &error_abort);
106 return 0;
107 }
108
kvm_extioi_realize(DeviceState * dev,Error ** errp)109 void kvm_extioi_realize(DeviceState *dev, Error **errp)
110 {
111 LoongArchExtIOICommonState *lecs = LOONGARCH_EXTIOI_COMMON(dev);
112 LoongArchExtIOIState *les = LOONGARCH_EXTIOI(dev);
113 int ret;
114
115 ret = kvm_create_device(kvm_state, KVM_DEV_TYPE_LOONGARCH_EIOINTC, false);
116 if (ret < 0) {
117 fprintf(stderr, "create KVM_LOONGARCH_EIOINTC failed: %s\n",
118 strerror(-ret));
119 abort();
120 }
121
122 les->dev_fd = ret;
123 ret = kvm_device_access(les->dev_fd, KVM_DEV_LOONGARCH_EXTIOI_GRP_CTRL,
124 KVM_DEV_LOONGARCH_EXTIOI_CTRL_INIT_NUM_CPU,
125 &lecs->num_cpu, true, NULL);
126 if (ret < 0) {
127 fprintf(stderr, "KVM_LOONGARCH_EXTIOI_INIT_NUM_CPU failed: %s\n",
128 strerror(-ret));
129 abort();
130 }
131
132 ret = kvm_device_access(les->dev_fd, KVM_DEV_LOONGARCH_EXTIOI_GRP_CTRL,
133 KVM_DEV_LOONGARCH_EXTIOI_CTRL_INIT_FEATURE,
134 &lecs->features, true, NULL);
135 if (ret < 0) {
136 fprintf(stderr, "KVM_LOONGARCH_EXTIOI_INIT_FEATURE failed: %s\n",
137 strerror(-ret));
138 abort();
139 }
140 }
141