Commit | Line | Data |
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7837699f SY |
1 | /* |
2 | * 8253/8254 interval timer emulation | |
3 | * | |
4 | * Copyright (c) 2003-2004 Fabrice Bellard | |
5 | * Copyright (c) 2006 Intel Corporation | |
6 | * Copyright (c) 2007 Keir Fraser, XenSource Inc | |
7 | * Copyright (c) 2008 Intel Corporation | |
8 | * | |
9 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
10 | * of this software and associated documentation files (the "Software"), to deal | |
11 | * in the Software without restriction, including without limitation the rights | |
12 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
13 | * copies of the Software, and to permit persons to whom the Software is | |
14 | * furnished to do so, subject to the following conditions: | |
15 | * | |
16 | * The above copyright notice and this permission notice shall be included in | |
17 | * all copies or substantial portions of the Software. | |
18 | * | |
19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
20 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
22 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
23 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
24 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
25 | * THE SOFTWARE. | |
26 | * | |
27 | * Authors: | |
28 | * Sheng Yang <sheng.yang@intel.com> | |
29 | * Based on QEMU and Xen. | |
30 | */ | |
31 | ||
32 | #include <linux/kvm_host.h> | |
33 | ||
34 | #include "irq.h" | |
35 | #include "i8254.h" | |
36 | ||
37 | #ifndef CONFIG_X86_64 | |
6f6d6a1a | 38 | #define mod_64(x, y) ((x) - (y) * div64_u64(x, y)) |
7837699f SY |
39 | #else |
40 | #define mod_64(x, y) ((x) % (y)) | |
41 | #endif | |
42 | ||
43 | #define RW_STATE_LSB 1 | |
44 | #define RW_STATE_MSB 2 | |
45 | #define RW_STATE_WORD0 3 | |
46 | #define RW_STATE_WORD1 4 | |
47 | ||
48 | /* Compute with 96 bit intermediate result: (a*b)/c */ | |
49 | static u64 muldiv64(u64 a, u32 b, u32 c) | |
50 | { | |
51 | union { | |
52 | u64 ll; | |
53 | struct { | |
54 | u32 low, high; | |
55 | } l; | |
56 | } u, res; | |
57 | u64 rl, rh; | |
58 | ||
59 | u.ll = a; | |
60 | rl = (u64)u.l.low * (u64)b; | |
61 | rh = (u64)u.l.high * (u64)b; | |
62 | rh += (rl >> 32); | |
6f6d6a1a RZ |
63 | res.l.high = div64_u64(rh, c); |
64 | res.l.low = div64_u64(((mod_64(rh, c) << 32) + (rl & 0xffffffff)), c); | |
7837699f SY |
65 | return res.ll; |
66 | } | |
67 | ||
68 | static void pit_set_gate(struct kvm *kvm, int channel, u32 val) | |
69 | { | |
70 | struct kvm_kpit_channel_state *c = | |
71 | &kvm->arch.vpit->pit_state.channels[channel]; | |
72 | ||
73 | WARN_ON(!mutex_is_locked(&kvm->arch.vpit->pit_state.lock)); | |
74 | ||
75 | switch (c->mode) { | |
76 | default: | |
77 | case 0: | |
78 | case 4: | |
79 | /* XXX: just disable/enable counting */ | |
80 | break; | |
81 | case 1: | |
82 | case 2: | |
83 | case 3: | |
84 | case 5: | |
85 | /* Restart counting on rising edge. */ | |
86 | if (c->gate < val) | |
87 | c->count_load_time = ktime_get(); | |
88 | break; | |
89 | } | |
90 | ||
91 | c->gate = val; | |
92 | } | |
93 | ||
8b2cf73c | 94 | static int pit_get_gate(struct kvm *kvm, int channel) |
7837699f SY |
95 | { |
96 | WARN_ON(!mutex_is_locked(&kvm->arch.vpit->pit_state.lock)); | |
97 | ||
98 | return kvm->arch.vpit->pit_state.channels[channel].gate; | |
99 | } | |
100 | ||
fd668423 MT |
101 | static s64 __kpit_elapsed(struct kvm *kvm) |
102 | { | |
103 | s64 elapsed; | |
104 | ktime_t remaining; | |
105 | struct kvm_kpit_state *ps = &kvm->arch.vpit->pit_state; | |
106 | ||
ede2ccc5 MT |
107 | /* |
108 | * The Counter does not stop when it reaches zero. In | |
109 | * Modes 0, 1, 4, and 5 the Counter ``wraps around'' to | |
110 | * the highest count, either FFFF hex for binary counting | |
111 | * or 9999 for BCD counting, and continues counting. | |
112 | * Modes 2 and 3 are periodic; the Counter reloads | |
113 | * itself with the initial count and continues counting | |
114 | * from there. | |
115 | */ | |
fd668423 | 116 | remaining = hrtimer_expires_remaining(&ps->pit_timer.timer); |
ede2ccc5 MT |
117 | elapsed = ps->pit_timer.period - ktime_to_ns(remaining); |
118 | elapsed = mod_64(elapsed, ps->pit_timer.period); | |
fd668423 MT |
119 | |
120 | return elapsed; | |
121 | } | |
122 | ||
123 | static s64 kpit_elapsed(struct kvm *kvm, struct kvm_kpit_channel_state *c, | |
124 | int channel) | |
125 | { | |
126 | if (channel == 0) | |
127 | return __kpit_elapsed(kvm); | |
128 | ||
129 | return ktime_to_ns(ktime_sub(ktime_get(), c->count_load_time)); | |
130 | } | |
131 | ||
7837699f SY |
132 | static int pit_get_count(struct kvm *kvm, int channel) |
133 | { | |
134 | struct kvm_kpit_channel_state *c = | |
135 | &kvm->arch.vpit->pit_state.channels[channel]; | |
136 | s64 d, t; | |
137 | int counter; | |
138 | ||
139 | WARN_ON(!mutex_is_locked(&kvm->arch.vpit->pit_state.lock)); | |
140 | ||
fd668423 | 141 | t = kpit_elapsed(kvm, c, channel); |
7837699f SY |
142 | d = muldiv64(t, KVM_PIT_FREQ, NSEC_PER_SEC); |
143 | ||
144 | switch (c->mode) { | |
145 | case 0: | |
146 | case 1: | |
147 | case 4: | |
148 | case 5: | |
149 | counter = (c->count - d) & 0xffff; | |
150 | break; | |
151 | case 3: | |
152 | /* XXX: may be incorrect for odd counts */ | |
153 | counter = c->count - (mod_64((2 * d), c->count)); | |
154 | break; | |
155 | default: | |
156 | counter = c->count - mod_64(d, c->count); | |
157 | break; | |
158 | } | |
159 | return counter; | |
160 | } | |
161 | ||
162 | static int pit_get_out(struct kvm *kvm, int channel) | |
163 | { | |
164 | struct kvm_kpit_channel_state *c = | |
165 | &kvm->arch.vpit->pit_state.channels[channel]; | |
166 | s64 d, t; | |
167 | int out; | |
168 | ||
169 | WARN_ON(!mutex_is_locked(&kvm->arch.vpit->pit_state.lock)); | |
170 | ||
fd668423 | 171 | t = kpit_elapsed(kvm, c, channel); |
7837699f SY |
172 | d = muldiv64(t, KVM_PIT_FREQ, NSEC_PER_SEC); |
173 | ||
174 | switch (c->mode) { | |
175 | default: | |
176 | case 0: | |
177 | out = (d >= c->count); | |
178 | break; | |
179 | case 1: | |
180 | out = (d < c->count); | |
181 | break; | |
182 | case 2: | |
183 | out = ((mod_64(d, c->count) == 0) && (d != 0)); | |
184 | break; | |
185 | case 3: | |
186 | out = (mod_64(d, c->count) < ((c->count + 1) >> 1)); | |
187 | break; | |
188 | case 4: | |
189 | case 5: | |
190 | out = (d == c->count); | |
191 | break; | |
192 | } | |
193 | ||
194 | return out; | |
195 | } | |
196 | ||
197 | static void pit_latch_count(struct kvm *kvm, int channel) | |
198 | { | |
199 | struct kvm_kpit_channel_state *c = | |
200 | &kvm->arch.vpit->pit_state.channels[channel]; | |
201 | ||
202 | WARN_ON(!mutex_is_locked(&kvm->arch.vpit->pit_state.lock)); | |
203 | ||
204 | if (!c->count_latched) { | |
205 | c->latched_count = pit_get_count(kvm, channel); | |
206 | c->count_latched = c->rw_mode; | |
207 | } | |
208 | } | |
209 | ||
210 | static void pit_latch_status(struct kvm *kvm, int channel) | |
211 | { | |
212 | struct kvm_kpit_channel_state *c = | |
213 | &kvm->arch.vpit->pit_state.channels[channel]; | |
214 | ||
215 | WARN_ON(!mutex_is_locked(&kvm->arch.vpit->pit_state.lock)); | |
216 | ||
217 | if (!c->status_latched) { | |
218 | /* TODO: Return NULL COUNT (bit 6). */ | |
219 | c->status = ((pit_get_out(kvm, channel) << 7) | | |
220 | (c->rw_mode << 4) | | |
221 | (c->mode << 1) | | |
222 | c->bcd); | |
223 | c->status_latched = 1; | |
224 | } | |
225 | } | |
226 | ||
3d80840d MT |
227 | int pit_has_pending_timer(struct kvm_vcpu *vcpu) |
228 | { | |
229 | struct kvm_pit *pit = vcpu->kvm->arch.vpit; | |
230 | ||
3cf57fed | 231 | if (pit && vcpu->vcpu_id == 0 && pit->pit_state.irq_ack) |
3d80840d | 232 | return atomic_read(&pit->pit_state.pit_timer.pending); |
3d80840d MT |
233 | return 0; |
234 | } | |
235 | ||
ee032c99 | 236 | static void kvm_pit_ack_irq(struct kvm_irq_ack_notifier *kian) |
3cf57fed MT |
237 | { |
238 | struct kvm_kpit_state *ps = container_of(kian, struct kvm_kpit_state, | |
239 | irq_ack_notifier); | |
240 | spin_lock(&ps->inject_lock); | |
241 | if (atomic_dec_return(&ps->pit_timer.pending) < 0) | |
dc7404ce | 242 | atomic_inc(&ps->pit_timer.pending); |
3cf57fed MT |
243 | ps->irq_ack = 1; |
244 | spin_unlock(&ps->inject_lock); | |
245 | } | |
246 | ||
2f599714 MT |
247 | void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu) |
248 | { | |
249 | struct kvm_pit *pit = vcpu->kvm->arch.vpit; | |
250 | struct hrtimer *timer; | |
251 | ||
252 | if (vcpu->vcpu_id != 0 || !pit) | |
253 | return; | |
254 | ||
255 | timer = &pit->pit_state.pit_timer.timer; | |
256 | if (hrtimer_cancel(timer)) | |
beb20d52 | 257 | hrtimer_start_expires(timer, HRTIMER_MODE_ABS); |
2f599714 MT |
258 | } |
259 | ||
d3c7b77d | 260 | static void destroy_pit_timer(struct kvm_timer *pt) |
7837699f SY |
261 | { |
262 | pr_debug("pit: execute del timer!\n"); | |
263 | hrtimer_cancel(&pt->timer); | |
264 | } | |
265 | ||
d3c7b77d MT |
266 | static bool kpit_is_periodic(struct kvm_timer *ktimer) |
267 | { | |
268 | struct kvm_kpit_state *ps = container_of(ktimer, struct kvm_kpit_state, | |
269 | pit_timer); | |
270 | return ps->is_periodic; | |
271 | } | |
272 | ||
386eb6e8 | 273 | static struct kvm_timer_ops kpit_ops = { |
d3c7b77d MT |
274 | .is_periodic = kpit_is_periodic, |
275 | }; | |
276 | ||
3cf57fed | 277 | static void create_pit_timer(struct kvm_kpit_state *ps, u32 val, int is_period) |
7837699f | 278 | { |
d3c7b77d | 279 | struct kvm_timer *pt = &ps->pit_timer; |
7837699f SY |
280 | s64 interval; |
281 | ||
282 | interval = muldiv64(val, NSEC_PER_SEC, KVM_PIT_FREQ); | |
283 | ||
284 | pr_debug("pit: create pit timer, interval is %llu nsec\n", interval); | |
285 | ||
286 | /* TODO The new value only affected after the retriggered */ | |
287 | hrtimer_cancel(&pt->timer); | |
ede2ccc5 | 288 | pt->period = interval; |
d3c7b77d MT |
289 | ps->is_periodic = is_period; |
290 | ||
291 | pt->timer.function = kvm_timer_fn; | |
292 | pt->t_ops = &kpit_ops; | |
293 | pt->kvm = ps->pit->kvm; | |
294 | pt->vcpu_id = 0; | |
295 | ||
7837699f | 296 | atomic_set(&pt->pending, 0); |
3cf57fed | 297 | ps->irq_ack = 1; |
7837699f SY |
298 | |
299 | hrtimer_start(&pt->timer, ktime_add_ns(ktime_get(), interval), | |
300 | HRTIMER_MODE_ABS); | |
301 | } | |
302 | ||
303 | static void pit_load_count(struct kvm *kvm, int channel, u32 val) | |
304 | { | |
305 | struct kvm_kpit_state *ps = &kvm->arch.vpit->pit_state; | |
306 | ||
307 | WARN_ON(!mutex_is_locked(&ps->lock)); | |
308 | ||
309 | pr_debug("pit: load_count val is %d, channel is %d\n", val, channel); | |
310 | ||
311 | /* | |
ede2ccc5 MT |
312 | * The largest possible initial count is 0; this is equivalent |
313 | * to 216 for binary counting and 104 for BCD counting. | |
7837699f SY |
314 | */ |
315 | if (val == 0) | |
316 | val = 0x10000; | |
317 | ||
7837699f SY |
318 | ps->channels[channel].count = val; |
319 | ||
fd668423 MT |
320 | if (channel != 0) { |
321 | ps->channels[channel].count_load_time = ktime_get(); | |
7837699f | 322 | return; |
fd668423 | 323 | } |
7837699f SY |
324 | |
325 | /* Two types of timer | |
326 | * mode 1 is one shot, mode 2 is period, otherwise del timer */ | |
327 | switch (ps->channels[0].mode) { | |
ede2ccc5 | 328 | case 0: |
7837699f | 329 | case 1: |
ece15bab MT |
330 | /* FIXME: enhance mode 4 precision */ |
331 | case 4: | |
3cf57fed | 332 | create_pit_timer(ps, val, 0); |
7837699f SY |
333 | break; |
334 | case 2: | |
f6975545 | 335 | case 3: |
3cf57fed | 336 | create_pit_timer(ps, val, 1); |
7837699f SY |
337 | break; |
338 | default: | |
339 | destroy_pit_timer(&ps->pit_timer); | |
340 | } | |
341 | } | |
342 | ||
e0f63cb9 SY |
343 | void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val) |
344 | { | |
345 | mutex_lock(&kvm->arch.vpit->pit_state.lock); | |
346 | pit_load_count(kvm, channel, val); | |
347 | mutex_unlock(&kvm->arch.vpit->pit_state.lock); | |
348 | } | |
349 | ||
7837699f SY |
350 | static void pit_ioport_write(struct kvm_io_device *this, |
351 | gpa_t addr, int len, const void *data) | |
352 | { | |
353 | struct kvm_pit *pit = (struct kvm_pit *)this->private; | |
354 | struct kvm_kpit_state *pit_state = &pit->pit_state; | |
355 | struct kvm *kvm = pit->kvm; | |
356 | int channel, access; | |
357 | struct kvm_kpit_channel_state *s; | |
358 | u32 val = *(u32 *) data; | |
359 | ||
360 | val &= 0xff; | |
361 | addr &= KVM_PIT_CHANNEL_MASK; | |
362 | ||
363 | mutex_lock(&pit_state->lock); | |
364 | ||
365 | if (val != 0) | |
366 | pr_debug("pit: write addr is 0x%x, len is %d, val is 0x%x\n", | |
367 | (unsigned int)addr, len, val); | |
368 | ||
369 | if (addr == 3) { | |
370 | channel = val >> 6; | |
371 | if (channel == 3) { | |
372 | /* Read-Back Command. */ | |
373 | for (channel = 0; channel < 3; channel++) { | |
374 | s = &pit_state->channels[channel]; | |
375 | if (val & (2 << channel)) { | |
376 | if (!(val & 0x20)) | |
377 | pit_latch_count(kvm, channel); | |
378 | if (!(val & 0x10)) | |
379 | pit_latch_status(kvm, channel); | |
380 | } | |
381 | } | |
382 | } else { | |
383 | /* Select Counter <channel>. */ | |
384 | s = &pit_state->channels[channel]; | |
385 | access = (val >> 4) & KVM_PIT_CHANNEL_MASK; | |
386 | if (access == 0) { | |
387 | pit_latch_count(kvm, channel); | |
388 | } else { | |
389 | s->rw_mode = access; | |
390 | s->read_state = access; | |
391 | s->write_state = access; | |
392 | s->mode = (val >> 1) & 7; | |
393 | if (s->mode > 5) | |
394 | s->mode -= 4; | |
395 | s->bcd = val & 1; | |
396 | } | |
397 | } | |
398 | } else { | |
399 | /* Write Count. */ | |
400 | s = &pit_state->channels[addr]; | |
401 | switch (s->write_state) { | |
402 | default: | |
403 | case RW_STATE_LSB: | |
404 | pit_load_count(kvm, addr, val); | |
405 | break; | |
406 | case RW_STATE_MSB: | |
407 | pit_load_count(kvm, addr, val << 8); | |
408 | break; | |
409 | case RW_STATE_WORD0: | |
410 | s->write_latch = val; | |
411 | s->write_state = RW_STATE_WORD1; | |
412 | break; | |
413 | case RW_STATE_WORD1: | |
414 | pit_load_count(kvm, addr, s->write_latch | (val << 8)); | |
415 | s->write_state = RW_STATE_WORD0; | |
416 | break; | |
417 | } | |
418 | } | |
419 | ||
420 | mutex_unlock(&pit_state->lock); | |
421 | } | |
422 | ||
423 | static void pit_ioport_read(struct kvm_io_device *this, | |
424 | gpa_t addr, int len, void *data) | |
425 | { | |
426 | struct kvm_pit *pit = (struct kvm_pit *)this->private; | |
427 | struct kvm_kpit_state *pit_state = &pit->pit_state; | |
428 | struct kvm *kvm = pit->kvm; | |
429 | int ret, count; | |
430 | struct kvm_kpit_channel_state *s; | |
431 | ||
432 | addr &= KVM_PIT_CHANNEL_MASK; | |
433 | s = &pit_state->channels[addr]; | |
434 | ||
435 | mutex_lock(&pit_state->lock); | |
436 | ||
437 | if (s->status_latched) { | |
438 | s->status_latched = 0; | |
439 | ret = s->status; | |
440 | } else if (s->count_latched) { | |
441 | switch (s->count_latched) { | |
442 | default: | |
443 | case RW_STATE_LSB: | |
444 | ret = s->latched_count & 0xff; | |
445 | s->count_latched = 0; | |
446 | break; | |
447 | case RW_STATE_MSB: | |
448 | ret = s->latched_count >> 8; | |
449 | s->count_latched = 0; | |
450 | break; | |
451 | case RW_STATE_WORD0: | |
452 | ret = s->latched_count & 0xff; | |
453 | s->count_latched = RW_STATE_MSB; | |
454 | break; | |
455 | } | |
456 | } else { | |
457 | switch (s->read_state) { | |
458 | default: | |
459 | case RW_STATE_LSB: | |
460 | count = pit_get_count(kvm, addr); | |
461 | ret = count & 0xff; | |
462 | break; | |
463 | case RW_STATE_MSB: | |
464 | count = pit_get_count(kvm, addr); | |
465 | ret = (count >> 8) & 0xff; | |
466 | break; | |
467 | case RW_STATE_WORD0: | |
468 | count = pit_get_count(kvm, addr); | |
469 | ret = count & 0xff; | |
470 | s->read_state = RW_STATE_WORD1; | |
471 | break; | |
472 | case RW_STATE_WORD1: | |
473 | count = pit_get_count(kvm, addr); | |
474 | ret = (count >> 8) & 0xff; | |
475 | s->read_state = RW_STATE_WORD0; | |
476 | break; | |
477 | } | |
478 | } | |
479 | ||
480 | if (len > sizeof(ret)) | |
481 | len = sizeof(ret); | |
482 | memcpy(data, (char *)&ret, len); | |
483 | ||
484 | mutex_unlock(&pit_state->lock); | |
485 | } | |
486 | ||
92760499 LV |
487 | static int pit_in_range(struct kvm_io_device *this, gpa_t addr, |
488 | int len, int is_write) | |
7837699f SY |
489 | { |
490 | return ((addr >= KVM_PIT_BASE_ADDRESS) && | |
491 | (addr < KVM_PIT_BASE_ADDRESS + KVM_PIT_MEM_LENGTH)); | |
492 | } | |
493 | ||
494 | static void speaker_ioport_write(struct kvm_io_device *this, | |
495 | gpa_t addr, int len, const void *data) | |
496 | { | |
497 | struct kvm_pit *pit = (struct kvm_pit *)this->private; | |
498 | struct kvm_kpit_state *pit_state = &pit->pit_state; | |
499 | struct kvm *kvm = pit->kvm; | |
500 | u32 val = *(u32 *) data; | |
501 | ||
502 | mutex_lock(&pit_state->lock); | |
503 | pit_state->speaker_data_on = (val >> 1) & 1; | |
504 | pit_set_gate(kvm, 2, val & 1); | |
505 | mutex_unlock(&pit_state->lock); | |
506 | } | |
507 | ||
508 | static void speaker_ioport_read(struct kvm_io_device *this, | |
509 | gpa_t addr, int len, void *data) | |
510 | { | |
511 | struct kvm_pit *pit = (struct kvm_pit *)this->private; | |
512 | struct kvm_kpit_state *pit_state = &pit->pit_state; | |
513 | struct kvm *kvm = pit->kvm; | |
514 | unsigned int refresh_clock; | |
515 | int ret; | |
516 | ||
517 | /* Refresh clock toggles at about 15us. We approximate as 2^14ns. */ | |
518 | refresh_clock = ((unsigned int)ktime_to_ns(ktime_get()) >> 14) & 1; | |
519 | ||
520 | mutex_lock(&pit_state->lock); | |
521 | ret = ((pit_state->speaker_data_on << 1) | pit_get_gate(kvm, 2) | | |
522 | (pit_get_out(kvm, 2) << 5) | (refresh_clock << 4)); | |
523 | if (len > sizeof(ret)) | |
524 | len = sizeof(ret); | |
525 | memcpy(data, (char *)&ret, len); | |
526 | mutex_unlock(&pit_state->lock); | |
527 | } | |
528 | ||
92760499 LV |
529 | static int speaker_in_range(struct kvm_io_device *this, gpa_t addr, |
530 | int len, int is_write) | |
7837699f SY |
531 | { |
532 | return (addr == KVM_SPEAKER_BASE_ADDRESS); | |
533 | } | |
534 | ||
308b0f23 | 535 | void kvm_pit_reset(struct kvm_pit *pit) |
7837699f SY |
536 | { |
537 | int i; | |
308b0f23 SY |
538 | struct kvm_kpit_channel_state *c; |
539 | ||
540 | mutex_lock(&pit->pit_state.lock); | |
541 | for (i = 0; i < 3; i++) { | |
542 | c = &pit->pit_state.channels[i]; | |
543 | c->mode = 0xff; | |
544 | c->gate = (i != 2); | |
545 | pit_load_count(pit->kvm, i, 0); | |
546 | } | |
547 | mutex_unlock(&pit->pit_state.lock); | |
548 | ||
549 | atomic_set(&pit->pit_state.pit_timer.pending, 0); | |
3cf57fed | 550 | pit->pit_state.irq_ack = 1; |
308b0f23 SY |
551 | } |
552 | ||
4780c659 AK |
553 | static void pit_mask_notifer(struct kvm_irq_mask_notifier *kimn, bool mask) |
554 | { | |
555 | struct kvm_pit *pit = container_of(kimn, struct kvm_pit, mask_notifier); | |
556 | ||
557 | if (!mask) { | |
558 | atomic_set(&pit->pit_state.pit_timer.pending, 0); | |
559 | pit->pit_state.irq_ack = 1; | |
560 | } | |
561 | } | |
562 | ||
308b0f23 SY |
563 | struct kvm_pit *kvm_create_pit(struct kvm *kvm) |
564 | { | |
7837699f SY |
565 | struct kvm_pit *pit; |
566 | struct kvm_kpit_state *pit_state; | |
7837699f SY |
567 | |
568 | pit = kzalloc(sizeof(struct kvm_pit), GFP_KERNEL); | |
569 | if (!pit) | |
570 | return NULL; | |
571 | ||
5550af4d | 572 | pit->irq_source_id = kvm_request_irq_source_id(kvm); |
e17d1dc0 AK |
573 | if (pit->irq_source_id < 0) { |
574 | kfree(pit); | |
5550af4d | 575 | return NULL; |
e17d1dc0 | 576 | } |
5550af4d | 577 | |
7837699f SY |
578 | mutex_init(&pit->pit_state.lock); |
579 | mutex_lock(&pit->pit_state.lock); | |
3cf57fed | 580 | spin_lock_init(&pit->pit_state.inject_lock); |
7837699f SY |
581 | |
582 | /* Initialize PIO device */ | |
583 | pit->dev.read = pit_ioport_read; | |
584 | pit->dev.write = pit_ioport_write; | |
585 | pit->dev.in_range = pit_in_range; | |
586 | pit->dev.private = pit; | |
587 | kvm_io_bus_register_dev(&kvm->pio_bus, &pit->dev); | |
588 | ||
589 | pit->speaker_dev.read = speaker_ioport_read; | |
590 | pit->speaker_dev.write = speaker_ioport_write; | |
591 | pit->speaker_dev.in_range = speaker_in_range; | |
592 | pit->speaker_dev.private = pit; | |
593 | kvm_io_bus_register_dev(&kvm->pio_bus, &pit->speaker_dev); | |
594 | ||
595 | kvm->arch.vpit = pit; | |
596 | pit->kvm = kvm; | |
597 | ||
598 | pit_state = &pit->pit_state; | |
599 | pit_state->pit = pit; | |
600 | hrtimer_init(&pit_state->pit_timer.timer, | |
601 | CLOCK_MONOTONIC, HRTIMER_MODE_ABS); | |
3cf57fed MT |
602 | pit_state->irq_ack_notifier.gsi = 0; |
603 | pit_state->irq_ack_notifier.irq_acked = kvm_pit_ack_irq; | |
604 | kvm_register_irq_ack_notifier(kvm, &pit_state->irq_ack_notifier); | |
52d939a0 | 605 | pit_state->pit_timer.reinject = true; |
7837699f SY |
606 | mutex_unlock(&pit->pit_state.lock); |
607 | ||
308b0f23 | 608 | kvm_pit_reset(pit); |
7837699f | 609 | |
4780c659 AK |
610 | pit->mask_notifier.func = pit_mask_notifer; |
611 | kvm_register_irq_mask_notifier(kvm, 0, &pit->mask_notifier); | |
612 | ||
7837699f SY |
613 | return pit; |
614 | } | |
615 | ||
616 | void kvm_free_pit(struct kvm *kvm) | |
617 | { | |
618 | struct hrtimer *timer; | |
619 | ||
620 | if (kvm->arch.vpit) { | |
4780c659 AK |
621 | kvm_unregister_irq_mask_notifier(kvm, 0, |
622 | &kvm->arch.vpit->mask_notifier); | |
7837699f SY |
623 | mutex_lock(&kvm->arch.vpit->pit_state.lock); |
624 | timer = &kvm->arch.vpit->pit_state.pit_timer.timer; | |
625 | hrtimer_cancel(timer); | |
5550af4d | 626 | kvm_free_irq_source_id(kvm, kvm->arch.vpit->irq_source_id); |
7837699f SY |
627 | mutex_unlock(&kvm->arch.vpit->pit_state.lock); |
628 | kfree(kvm->arch.vpit); | |
629 | } | |
630 | } | |
631 | ||
8b2cf73c | 632 | static void __inject_pit_timer_intr(struct kvm *kvm) |
7837699f | 633 | { |
23930f95 JK |
634 | struct kvm_vcpu *vcpu; |
635 | int i; | |
636 | ||
7837699f | 637 | mutex_lock(&kvm->lock); |
5550af4d SY |
638 | kvm_set_irq(kvm, kvm->arch.vpit->irq_source_id, 0, 1); |
639 | kvm_set_irq(kvm, kvm->arch.vpit->irq_source_id, 0, 0); | |
7837699f | 640 | mutex_unlock(&kvm->lock); |
23930f95 JK |
641 | |
642 | /* | |
8fdb2351 JK |
643 | * Provides NMI watchdog support via Virtual Wire mode. |
644 | * The route is: PIT -> PIC -> LVT0 in NMI mode. | |
645 | * | |
646 | * Note: Our Virtual Wire implementation is simplified, only | |
647 | * propagating PIT interrupts to all VCPUs when they have set | |
648 | * LVT0 to NMI delivery. Other PIC interrupts are just sent to | |
649 | * VCPU0, and only if its LVT0 is in EXTINT mode. | |
23930f95 | 650 | */ |
cc6e462c JK |
651 | if (kvm->arch.vapics_in_nmi_mode > 0) |
652 | for (i = 0; i < KVM_MAX_VCPUS; ++i) { | |
653 | vcpu = kvm->vcpus[i]; | |
654 | if (vcpu) | |
655 | kvm_apic_nmi_wd_deliver(vcpu); | |
656 | } | |
7837699f SY |
657 | } |
658 | ||
659 | void kvm_inject_pit_timer_irqs(struct kvm_vcpu *vcpu) | |
660 | { | |
661 | struct kvm_pit *pit = vcpu->kvm->arch.vpit; | |
662 | struct kvm *kvm = vcpu->kvm; | |
663 | struct kvm_kpit_state *ps; | |
664 | ||
665 | if (vcpu && pit) { | |
3cf57fed | 666 | int inject = 0; |
7837699f SY |
667 | ps = &pit->pit_state; |
668 | ||
3cf57fed MT |
669 | /* Try to inject pending interrupts when |
670 | * last one has been acked. | |
671 | */ | |
672 | spin_lock(&ps->inject_lock); | |
673 | if (atomic_read(&ps->pit_timer.pending) && ps->irq_ack) { | |
674 | ps->irq_ack = 0; | |
675 | inject = 1; | |
7837699f | 676 | } |
3cf57fed MT |
677 | spin_unlock(&ps->inject_lock); |
678 | if (inject) | |
679 | __inject_pit_timer_intr(kvm); | |
7837699f SY |
680 | } |
681 | } |