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5d17c0d2 JK |
1 | /* |
2 | * KVM in-kernel PIT (i8254) support | |
3 | * | |
4 | * Copyright (c) 2003-2004 Fabrice Bellard | |
5 | * Copyright (c) 2012 Jan Kiszka, Siemens AG | |
6 | * | |
7 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
8 | * of this software and associated documentation files (the "Software"), to deal | |
9 | * in the Software without restriction, including without limitation the rights | |
10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
11 | * copies of the Software, and to permit persons to whom the Software is | |
12 | * furnished to do so, subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice shall be included in | |
15 | * all copies or substantial portions of the Software. | |
16 | * | |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
23 | * THE SOFTWARE. | |
24 | */ | |
25 | #include "qemu-timer.h" | |
26 | #include "hw/i8254.h" | |
27 | #include "hw/i8254_internal.h" | |
28 | #include "kvm.h" | |
29 | ||
30 | #define KVM_PIT_REINJECT_BIT 0 | |
31 | ||
32 | typedef struct KVMPITState { | |
33 | PITCommonState pit; | |
34 | LostTickPolicy lost_tick_policy; | |
35 | } KVMPITState; | |
36 | ||
37 | static void kvm_pit_get(PITCommonState *s) | |
38 | { | |
39 | struct kvm_pit_state2 kpit; | |
40 | struct kvm_pit_channel_state *kchan; | |
41 | struct PITChannelState *sc; | |
42 | int i, ret; | |
43 | ||
44 | if (kvm_has_pit_state2()) { | |
45 | ret = kvm_vm_ioctl(kvm_state, KVM_GET_PIT2, &kpit); | |
46 | if (ret < 0) { | |
47 | fprintf(stderr, "KVM_GET_PIT2 failed: %s\n", strerror(ret)); | |
48 | abort(); | |
49 | } | |
50 | s->channels[0].irq_disabled = kpit.flags & KVM_PIT_FLAGS_HPET_LEGACY; | |
51 | } else { | |
52 | /* | |
53 | * kvm_pit_state2 is superset of kvm_pit_state struct, | |
54 | * so we can use it for KVM_GET_PIT as well. | |
55 | */ | |
56 | ret = kvm_vm_ioctl(kvm_state, KVM_GET_PIT, &kpit); | |
57 | if (ret < 0) { | |
58 | fprintf(stderr, "KVM_GET_PIT failed: %s\n", strerror(ret)); | |
59 | abort(); | |
60 | } | |
61 | } | |
62 | for (i = 0; i < 3; i++) { | |
63 | kchan = &kpit.channels[i]; | |
64 | sc = &s->channels[i]; | |
65 | sc->count = kchan->count; | |
66 | sc->latched_count = kchan->latched_count; | |
67 | sc->count_latched = kchan->count_latched; | |
68 | sc->status_latched = kchan->status_latched; | |
69 | sc->status = kchan->status; | |
70 | sc->read_state = kchan->read_state; | |
71 | sc->write_state = kchan->write_state; | |
72 | sc->write_latch = kchan->write_latch; | |
73 | sc->rw_mode = kchan->rw_mode; | |
74 | sc->mode = kchan->mode; | |
75 | sc->bcd = kchan->bcd; | |
76 | sc->gate = kchan->gate; | |
77 | sc->count_load_time = kchan->count_load_time; | |
78 | } | |
79 | ||
80 | sc = &s->channels[0]; | |
81 | sc->next_transition_time = | |
82 | pit_get_next_transition_time(sc, sc->count_load_time); | |
83 | } | |
84 | ||
85 | static void kvm_pit_put(PITCommonState *s) | |
86 | { | |
87 | struct kvm_pit_state2 kpit; | |
88 | struct kvm_pit_channel_state *kchan; | |
89 | struct PITChannelState *sc; | |
90 | int i, ret; | |
91 | ||
92 | kpit.flags = s->channels[0].irq_disabled ? KVM_PIT_FLAGS_HPET_LEGACY : 0; | |
93 | for (i = 0; i < 3; i++) { | |
94 | kchan = &kpit.channels[i]; | |
95 | sc = &s->channels[i]; | |
96 | kchan->count = sc->count; | |
97 | kchan->latched_count = sc->latched_count; | |
98 | kchan->count_latched = sc->count_latched; | |
99 | kchan->status_latched = sc->status_latched; | |
100 | kchan->status = sc->status; | |
101 | kchan->read_state = sc->read_state; | |
102 | kchan->write_state = sc->write_state; | |
103 | kchan->write_latch = sc->write_latch; | |
104 | kchan->rw_mode = sc->rw_mode; | |
105 | kchan->mode = sc->mode; | |
106 | kchan->bcd = sc->bcd; | |
107 | kchan->gate = sc->gate; | |
108 | kchan->count_load_time = sc->count_load_time; | |
109 | } | |
110 | ||
111 | ret = kvm_vm_ioctl(kvm_state, | |
112 | kvm_has_pit_state2() ? KVM_SET_PIT2 : KVM_SET_PIT, | |
113 | &kpit); | |
114 | if (ret < 0) { | |
115 | fprintf(stderr, "%s failed: %s\n", | |
116 | kvm_has_pit_state2() ? "KVM_SET_PIT2" : "KVM_SET_PIT", | |
117 | strerror(ret)); | |
118 | abort(); | |
119 | } | |
120 | } | |
121 | ||
122 | static void kvm_pit_set_gate(PITCommonState *s, PITChannelState *sc, int val) | |
123 | { | |
124 | kvm_pit_get(s); | |
125 | ||
126 | switch (sc->mode) { | |
127 | default: | |
128 | case 0: | |
129 | case 4: | |
130 | /* XXX: just disable/enable counting */ | |
131 | break; | |
132 | case 1: | |
133 | case 2: | |
134 | case 3: | |
135 | case 5: | |
136 | if (sc->gate < val) { | |
137 | /* restart counting on rising edge */ | |
138 | sc->count_load_time = qemu_get_clock_ns(vm_clock); | |
139 | } | |
140 | break; | |
141 | } | |
142 | sc->gate = val; | |
143 | ||
144 | kvm_pit_put(s); | |
145 | } | |
146 | ||
147 | static void kvm_pit_get_channel_info(PITCommonState *s, PITChannelState *sc, | |
148 | PITChannelInfo *info) | |
149 | { | |
150 | kvm_pit_get(s); | |
151 | ||
152 | pit_get_channel_info_common(s, sc, info); | |
153 | } | |
154 | ||
155 | static void kvm_pit_reset(DeviceState *dev) | |
156 | { | |
157 | PITCommonState *s = DO_UPCAST(PITCommonState, dev.qdev, dev); | |
158 | ||
159 | pit_reset_common(s); | |
160 | ||
161 | kvm_pit_put(s); | |
162 | } | |
163 | ||
164 | static void kvm_pit_irq_control(void *opaque, int n, int enable) | |
165 | { | |
166 | PITCommonState *pit = opaque; | |
167 | PITChannelState *s = &pit->channels[0]; | |
168 | ||
169 | kvm_pit_get(pit); | |
170 | ||
171 | s->irq_disabled = !enable; | |
172 | ||
173 | kvm_pit_put(pit); | |
174 | } | |
175 | ||
176 | static int kvm_pit_initfn(PITCommonState *pit) | |
177 | { | |
178 | KVMPITState *s = DO_UPCAST(KVMPITState, pit, pit); | |
179 | struct kvm_pit_config config = { | |
180 | .flags = 0, | |
181 | }; | |
182 | int ret; | |
183 | ||
184 | if (kvm_check_extension(kvm_state, KVM_CAP_PIT2)) { | |
185 | ret = kvm_vm_ioctl(kvm_state, KVM_CREATE_PIT2, &config); | |
186 | } else { | |
187 | ret = kvm_vm_ioctl(kvm_state, KVM_CREATE_PIT); | |
188 | } | |
189 | if (ret < 0) { | |
190 | fprintf(stderr, "Create kernel PIC irqchip failed: %s\n", | |
191 | strerror(ret)); | |
192 | return ret; | |
193 | } | |
194 | switch (s->lost_tick_policy) { | |
195 | case LOST_TICK_DELAY: | |
196 | break; /* enabled by default */ | |
197 | case LOST_TICK_DISCARD: | |
198 | if (kvm_check_extension(kvm_state, KVM_CAP_REINJECT_CONTROL)) { | |
199 | struct kvm_reinject_control control = { .pit_reinject = 0 }; | |
200 | ||
201 | ret = kvm_vm_ioctl(kvm_state, KVM_REINJECT_CONTROL, &control); | |
202 | if (ret < 0) { | |
203 | fprintf(stderr, | |
204 | "Can't disable in-kernel PIT reinjection: %s\n", | |
205 | strerror(ret)); | |
206 | return ret; | |
207 | } | |
208 | } | |
209 | break; | |
210 | default: | |
211 | return -EINVAL; | |
212 | } | |
213 | ||
214 | memory_region_init_reservation(&pit->ioports, "kvm-pit", 4); | |
215 | ||
216 | qdev_init_gpio_in(&pit->dev.qdev, kvm_pit_irq_control, 1); | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | static Property kvm_pit_properties[] = { | |
222 | DEFINE_PROP_HEX32("iobase", KVMPITState, pit.iobase, -1), | |
223 | DEFINE_PROP_LOSTTICKPOLICY("lost_tick_policy", KVMPITState, | |
224 | lost_tick_policy, LOST_TICK_DELAY), | |
225 | DEFINE_PROP_END_OF_LIST(), | |
226 | }; | |
227 | ||
228 | static void kvm_pit_class_init(ObjectClass *klass, void *data) | |
229 | { | |
230 | PITCommonClass *k = PIT_COMMON_CLASS(klass); | |
231 | DeviceClass *dc = DEVICE_CLASS(klass); | |
232 | ||
233 | k->init = kvm_pit_initfn; | |
234 | k->set_channel_gate = kvm_pit_set_gate; | |
235 | k->get_channel_info = kvm_pit_get_channel_info; | |
236 | k->pre_save = kvm_pit_get; | |
237 | k->post_load = kvm_pit_put; | |
238 | dc->reset = kvm_pit_reset; | |
239 | dc->props = kvm_pit_properties; | |
240 | } | |
241 | ||
242 | static TypeInfo kvm_pit_info = { | |
243 | .name = "kvm-pit", | |
244 | .parent = TYPE_PIT_COMMON, | |
245 | .instance_size = sizeof(KVMPITState), | |
246 | .class_init = kvm_pit_class_init, | |
247 | }; | |
248 | ||
249 | static void kvm_pit_register(void) | |
250 | { | |
251 | type_register_static(&kvm_pit_info); | |
252 | } | |
253 | ||
254 | type_init(kvm_pit_register) |