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 | ||
101 | static int pit_get_count(struct kvm *kvm, int channel) | |
102 | { | |
103 | struct kvm_kpit_channel_state *c = | |
104 | &kvm->arch.vpit->pit_state.channels[channel]; | |
105 | s64 d, t; | |
106 | int counter; | |
107 | ||
108 | WARN_ON(!mutex_is_locked(&kvm->arch.vpit->pit_state.lock)); | |
109 | ||
110 | t = ktime_to_ns(ktime_sub(ktime_get(), c->count_load_time)); | |
111 | d = muldiv64(t, KVM_PIT_FREQ, NSEC_PER_SEC); | |
112 | ||
113 | switch (c->mode) { | |
114 | case 0: | |
115 | case 1: | |
116 | case 4: | |
117 | case 5: | |
118 | counter = (c->count - d) & 0xffff; | |
119 | break; | |
120 | case 3: | |
121 | /* XXX: may be incorrect for odd counts */ | |
122 | counter = c->count - (mod_64((2 * d), c->count)); | |
123 | break; | |
124 | default: | |
125 | counter = c->count - mod_64(d, c->count); | |
126 | break; | |
127 | } | |
128 | return counter; | |
129 | } | |
130 | ||
131 | static int pit_get_out(struct kvm *kvm, int channel) | |
132 | { | |
133 | struct kvm_kpit_channel_state *c = | |
134 | &kvm->arch.vpit->pit_state.channels[channel]; | |
135 | s64 d, t; | |
136 | int out; | |
137 | ||
138 | WARN_ON(!mutex_is_locked(&kvm->arch.vpit->pit_state.lock)); | |
139 | ||
140 | t = ktime_to_ns(ktime_sub(ktime_get(), c->count_load_time)); | |
141 | d = muldiv64(t, KVM_PIT_FREQ, NSEC_PER_SEC); | |
142 | ||
143 | switch (c->mode) { | |
144 | default: | |
145 | case 0: | |
146 | out = (d >= c->count); | |
147 | break; | |
148 | case 1: | |
149 | out = (d < c->count); | |
150 | break; | |
151 | case 2: | |
152 | out = ((mod_64(d, c->count) == 0) && (d != 0)); | |
153 | break; | |
154 | case 3: | |
155 | out = (mod_64(d, c->count) < ((c->count + 1) >> 1)); | |
156 | break; | |
157 | case 4: | |
158 | case 5: | |
159 | out = (d == c->count); | |
160 | break; | |
161 | } | |
162 | ||
163 | return out; | |
164 | } | |
165 | ||
166 | static void pit_latch_count(struct kvm *kvm, int channel) | |
167 | { | |
168 | struct kvm_kpit_channel_state *c = | |
169 | &kvm->arch.vpit->pit_state.channels[channel]; | |
170 | ||
171 | WARN_ON(!mutex_is_locked(&kvm->arch.vpit->pit_state.lock)); | |
172 | ||
173 | if (!c->count_latched) { | |
174 | c->latched_count = pit_get_count(kvm, channel); | |
175 | c->count_latched = c->rw_mode; | |
176 | } | |
177 | } | |
178 | ||
179 | static void pit_latch_status(struct kvm *kvm, int channel) | |
180 | { | |
181 | struct kvm_kpit_channel_state *c = | |
182 | &kvm->arch.vpit->pit_state.channels[channel]; | |
183 | ||
184 | WARN_ON(!mutex_is_locked(&kvm->arch.vpit->pit_state.lock)); | |
185 | ||
186 | if (!c->status_latched) { | |
187 | /* TODO: Return NULL COUNT (bit 6). */ | |
188 | c->status = ((pit_get_out(kvm, channel) << 7) | | |
189 | (c->rw_mode << 4) | | |
190 | (c->mode << 1) | | |
191 | c->bcd); | |
192 | c->status_latched = 1; | |
193 | } | |
194 | } | |
195 | ||
8b2cf73c | 196 | static int __pit_timer_fn(struct kvm_kpit_state *ps) |
7837699f SY |
197 | { |
198 | struct kvm_vcpu *vcpu0 = ps->pit->kvm->vcpus[0]; | |
199 | struct kvm_kpit_timer *pt = &ps->pit_timer; | |
200 | ||
622395a9 | 201 | if (!atomic_inc_and_test(&pt->pending)) |
06e05645 | 202 | set_bit(KVM_REQ_PENDING_TIMER, &vcpu0->requests); |
d7690175 MT |
203 | |
204 | if (vcpu0 && waitqueue_active(&vcpu0->wq)) | |
622395a9 | 205 | wake_up_interruptible(&vcpu0->wq); |
7837699f | 206 | |
beb20d52 | 207 | hrtimer_add_expires_ns(&pt->timer, pt->period); |
651dab42 | 208 | pt->scheduled = hrtimer_get_expires_ns(&pt->timer); |
3cf57fed | 209 | if (pt->period) |
651dab42 | 210 | ps->channels[0].count_load_time = hrtimer_get_expires(&pt->timer); |
7837699f SY |
211 | |
212 | return (pt->period == 0 ? 0 : 1); | |
213 | } | |
214 | ||
3d80840d MT |
215 | int pit_has_pending_timer(struct kvm_vcpu *vcpu) |
216 | { | |
217 | struct kvm_pit *pit = vcpu->kvm->arch.vpit; | |
218 | ||
3cf57fed | 219 | if (pit && vcpu->vcpu_id == 0 && pit->pit_state.irq_ack) |
3d80840d | 220 | return atomic_read(&pit->pit_state.pit_timer.pending); |
3d80840d MT |
221 | return 0; |
222 | } | |
223 | ||
ee032c99 | 224 | static void kvm_pit_ack_irq(struct kvm_irq_ack_notifier *kian) |
3cf57fed MT |
225 | { |
226 | struct kvm_kpit_state *ps = container_of(kian, struct kvm_kpit_state, | |
227 | irq_ack_notifier); | |
228 | spin_lock(&ps->inject_lock); | |
229 | if (atomic_dec_return(&ps->pit_timer.pending) < 0) | |
dc7404ce | 230 | atomic_inc(&ps->pit_timer.pending); |
3cf57fed MT |
231 | ps->irq_ack = 1; |
232 | spin_unlock(&ps->inject_lock); | |
233 | } | |
234 | ||
7837699f SY |
235 | static enum hrtimer_restart pit_timer_fn(struct hrtimer *data) |
236 | { | |
237 | struct kvm_kpit_state *ps; | |
238 | int restart_timer = 0; | |
239 | ||
240 | ps = container_of(data, struct kvm_kpit_state, pit_timer.timer); | |
241 | ||
242 | restart_timer = __pit_timer_fn(ps); | |
243 | ||
244 | if (restart_timer) | |
245 | return HRTIMER_RESTART; | |
246 | else | |
247 | return HRTIMER_NORESTART; | |
248 | } | |
249 | ||
2f599714 MT |
250 | void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu) |
251 | { | |
252 | struct kvm_pit *pit = vcpu->kvm->arch.vpit; | |
253 | struct hrtimer *timer; | |
254 | ||
255 | if (vcpu->vcpu_id != 0 || !pit) | |
256 | return; | |
257 | ||
258 | timer = &pit->pit_state.pit_timer.timer; | |
259 | if (hrtimer_cancel(timer)) | |
beb20d52 | 260 | hrtimer_start_expires(timer, HRTIMER_MODE_ABS); |
2f599714 MT |
261 | } |
262 | ||
7837699f SY |
263 | static void destroy_pit_timer(struct kvm_kpit_timer *pt) |
264 | { | |
265 | pr_debug("pit: execute del timer!\n"); | |
266 | hrtimer_cancel(&pt->timer); | |
267 | } | |
268 | ||
3cf57fed | 269 | static void create_pit_timer(struct kvm_kpit_state *ps, u32 val, int is_period) |
7837699f | 270 | { |
3cf57fed | 271 | struct kvm_kpit_timer *pt = &ps->pit_timer; |
7837699f SY |
272 | s64 interval; |
273 | ||
274 | interval = muldiv64(val, NSEC_PER_SEC, KVM_PIT_FREQ); | |
275 | ||
276 | pr_debug("pit: create pit timer, interval is %llu nsec\n", interval); | |
277 | ||
278 | /* TODO The new value only affected after the retriggered */ | |
279 | hrtimer_cancel(&pt->timer); | |
280 | pt->period = (is_period == 0) ? 0 : interval; | |
281 | pt->timer.function = pit_timer_fn; | |
282 | atomic_set(&pt->pending, 0); | |
3cf57fed | 283 | ps->irq_ack = 1; |
7837699f SY |
284 | |
285 | hrtimer_start(&pt->timer, ktime_add_ns(ktime_get(), interval), | |
286 | HRTIMER_MODE_ABS); | |
287 | } | |
288 | ||
289 | static void pit_load_count(struct kvm *kvm, int channel, u32 val) | |
290 | { | |
291 | struct kvm_kpit_state *ps = &kvm->arch.vpit->pit_state; | |
292 | ||
293 | WARN_ON(!mutex_is_locked(&ps->lock)); | |
294 | ||
295 | pr_debug("pit: load_count val is %d, channel is %d\n", val, channel); | |
296 | ||
297 | /* | |
298 | * Though spec said the state of 8254 is undefined after power-up, | |
299 | * seems some tricky OS like Windows XP depends on IRQ0 interrupt | |
300 | * when booting up. | |
301 | * So here setting initialize rate for it, and not a specific number | |
302 | */ | |
303 | if (val == 0) | |
304 | val = 0x10000; | |
305 | ||
306 | ps->channels[channel].count_load_time = ktime_get(); | |
307 | ps->channels[channel].count = val; | |
308 | ||
309 | if (channel != 0) | |
310 | return; | |
311 | ||
312 | /* Two types of timer | |
313 | * mode 1 is one shot, mode 2 is period, otherwise del timer */ | |
314 | switch (ps->channels[0].mode) { | |
315 | case 1: | |
ece15bab MT |
316 | /* FIXME: enhance mode 4 precision */ |
317 | case 4: | |
3cf57fed | 318 | create_pit_timer(ps, val, 0); |
7837699f SY |
319 | break; |
320 | case 2: | |
f6975545 | 321 | case 3: |
3cf57fed | 322 | create_pit_timer(ps, val, 1); |
7837699f SY |
323 | break; |
324 | default: | |
325 | destroy_pit_timer(&ps->pit_timer); | |
326 | } | |
327 | } | |
328 | ||
e0f63cb9 SY |
329 | void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val) |
330 | { | |
331 | mutex_lock(&kvm->arch.vpit->pit_state.lock); | |
332 | pit_load_count(kvm, channel, val); | |
333 | mutex_unlock(&kvm->arch.vpit->pit_state.lock); | |
334 | } | |
335 | ||
7837699f SY |
336 | static void pit_ioport_write(struct kvm_io_device *this, |
337 | gpa_t addr, int len, const void *data) | |
338 | { | |
339 | struct kvm_pit *pit = (struct kvm_pit *)this->private; | |
340 | struct kvm_kpit_state *pit_state = &pit->pit_state; | |
341 | struct kvm *kvm = pit->kvm; | |
342 | int channel, access; | |
343 | struct kvm_kpit_channel_state *s; | |
344 | u32 val = *(u32 *) data; | |
345 | ||
346 | val &= 0xff; | |
347 | addr &= KVM_PIT_CHANNEL_MASK; | |
348 | ||
349 | mutex_lock(&pit_state->lock); | |
350 | ||
351 | if (val != 0) | |
352 | pr_debug("pit: write addr is 0x%x, len is %d, val is 0x%x\n", | |
353 | (unsigned int)addr, len, val); | |
354 | ||
355 | if (addr == 3) { | |
356 | channel = val >> 6; | |
357 | if (channel == 3) { | |
358 | /* Read-Back Command. */ | |
359 | for (channel = 0; channel < 3; channel++) { | |
360 | s = &pit_state->channels[channel]; | |
361 | if (val & (2 << channel)) { | |
362 | if (!(val & 0x20)) | |
363 | pit_latch_count(kvm, channel); | |
364 | if (!(val & 0x10)) | |
365 | pit_latch_status(kvm, channel); | |
366 | } | |
367 | } | |
368 | } else { | |
369 | /* Select Counter <channel>. */ | |
370 | s = &pit_state->channels[channel]; | |
371 | access = (val >> 4) & KVM_PIT_CHANNEL_MASK; | |
372 | if (access == 0) { | |
373 | pit_latch_count(kvm, channel); | |
374 | } else { | |
375 | s->rw_mode = access; | |
376 | s->read_state = access; | |
377 | s->write_state = access; | |
378 | s->mode = (val >> 1) & 7; | |
379 | if (s->mode > 5) | |
380 | s->mode -= 4; | |
381 | s->bcd = val & 1; | |
382 | } | |
383 | } | |
384 | } else { | |
385 | /* Write Count. */ | |
386 | s = &pit_state->channels[addr]; | |
387 | switch (s->write_state) { | |
388 | default: | |
389 | case RW_STATE_LSB: | |
390 | pit_load_count(kvm, addr, val); | |
391 | break; | |
392 | case RW_STATE_MSB: | |
393 | pit_load_count(kvm, addr, val << 8); | |
394 | break; | |
395 | case RW_STATE_WORD0: | |
396 | s->write_latch = val; | |
397 | s->write_state = RW_STATE_WORD1; | |
398 | break; | |
399 | case RW_STATE_WORD1: | |
400 | pit_load_count(kvm, addr, s->write_latch | (val << 8)); | |
401 | s->write_state = RW_STATE_WORD0; | |
402 | break; | |
403 | } | |
404 | } | |
405 | ||
406 | mutex_unlock(&pit_state->lock); | |
407 | } | |
408 | ||
409 | static void pit_ioport_read(struct kvm_io_device *this, | |
410 | gpa_t addr, int len, void *data) | |
411 | { | |
412 | struct kvm_pit *pit = (struct kvm_pit *)this->private; | |
413 | struct kvm_kpit_state *pit_state = &pit->pit_state; | |
414 | struct kvm *kvm = pit->kvm; | |
415 | int ret, count; | |
416 | struct kvm_kpit_channel_state *s; | |
417 | ||
418 | addr &= KVM_PIT_CHANNEL_MASK; | |
419 | s = &pit_state->channels[addr]; | |
420 | ||
421 | mutex_lock(&pit_state->lock); | |
422 | ||
423 | if (s->status_latched) { | |
424 | s->status_latched = 0; | |
425 | ret = s->status; | |
426 | } else if (s->count_latched) { | |
427 | switch (s->count_latched) { | |
428 | default: | |
429 | case RW_STATE_LSB: | |
430 | ret = s->latched_count & 0xff; | |
431 | s->count_latched = 0; | |
432 | break; | |
433 | case RW_STATE_MSB: | |
434 | ret = s->latched_count >> 8; | |
435 | s->count_latched = 0; | |
436 | break; | |
437 | case RW_STATE_WORD0: | |
438 | ret = s->latched_count & 0xff; | |
439 | s->count_latched = RW_STATE_MSB; | |
440 | break; | |
441 | } | |
442 | } else { | |
443 | switch (s->read_state) { | |
444 | default: | |
445 | case RW_STATE_LSB: | |
446 | count = pit_get_count(kvm, addr); | |
447 | ret = count & 0xff; | |
448 | break; | |
449 | case RW_STATE_MSB: | |
450 | count = pit_get_count(kvm, addr); | |
451 | ret = (count >> 8) & 0xff; | |
452 | break; | |
453 | case RW_STATE_WORD0: | |
454 | count = pit_get_count(kvm, addr); | |
455 | ret = count & 0xff; | |
456 | s->read_state = RW_STATE_WORD1; | |
457 | break; | |
458 | case RW_STATE_WORD1: | |
459 | count = pit_get_count(kvm, addr); | |
460 | ret = (count >> 8) & 0xff; | |
461 | s->read_state = RW_STATE_WORD0; | |
462 | break; | |
463 | } | |
464 | } | |
465 | ||
466 | if (len > sizeof(ret)) | |
467 | len = sizeof(ret); | |
468 | memcpy(data, (char *)&ret, len); | |
469 | ||
470 | mutex_unlock(&pit_state->lock); | |
471 | } | |
472 | ||
92760499 LV |
473 | static int pit_in_range(struct kvm_io_device *this, gpa_t addr, |
474 | int len, int is_write) | |
7837699f SY |
475 | { |
476 | return ((addr >= KVM_PIT_BASE_ADDRESS) && | |
477 | (addr < KVM_PIT_BASE_ADDRESS + KVM_PIT_MEM_LENGTH)); | |
478 | } | |
479 | ||
480 | static void speaker_ioport_write(struct kvm_io_device *this, | |
481 | gpa_t addr, int len, const void *data) | |
482 | { | |
483 | struct kvm_pit *pit = (struct kvm_pit *)this->private; | |
484 | struct kvm_kpit_state *pit_state = &pit->pit_state; | |
485 | struct kvm *kvm = pit->kvm; | |
486 | u32 val = *(u32 *) data; | |
487 | ||
488 | mutex_lock(&pit_state->lock); | |
489 | pit_state->speaker_data_on = (val >> 1) & 1; | |
490 | pit_set_gate(kvm, 2, val & 1); | |
491 | mutex_unlock(&pit_state->lock); | |
492 | } | |
493 | ||
494 | static void speaker_ioport_read(struct kvm_io_device *this, | |
495 | gpa_t addr, int len, 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 | unsigned int refresh_clock; | |
501 | int ret; | |
502 | ||
503 | /* Refresh clock toggles at about 15us. We approximate as 2^14ns. */ | |
504 | refresh_clock = ((unsigned int)ktime_to_ns(ktime_get()) >> 14) & 1; | |
505 | ||
506 | mutex_lock(&pit_state->lock); | |
507 | ret = ((pit_state->speaker_data_on << 1) | pit_get_gate(kvm, 2) | | |
508 | (pit_get_out(kvm, 2) << 5) | (refresh_clock << 4)); | |
509 | if (len > sizeof(ret)) | |
510 | len = sizeof(ret); | |
511 | memcpy(data, (char *)&ret, len); | |
512 | mutex_unlock(&pit_state->lock); | |
513 | } | |
514 | ||
92760499 LV |
515 | static int speaker_in_range(struct kvm_io_device *this, gpa_t addr, |
516 | int len, int is_write) | |
7837699f SY |
517 | { |
518 | return (addr == KVM_SPEAKER_BASE_ADDRESS); | |
519 | } | |
520 | ||
308b0f23 | 521 | void kvm_pit_reset(struct kvm_pit *pit) |
7837699f SY |
522 | { |
523 | int i; | |
308b0f23 SY |
524 | struct kvm_kpit_channel_state *c; |
525 | ||
526 | mutex_lock(&pit->pit_state.lock); | |
527 | for (i = 0; i < 3; i++) { | |
528 | c = &pit->pit_state.channels[i]; | |
529 | c->mode = 0xff; | |
530 | c->gate = (i != 2); | |
531 | pit_load_count(pit->kvm, i, 0); | |
532 | } | |
533 | mutex_unlock(&pit->pit_state.lock); | |
534 | ||
535 | atomic_set(&pit->pit_state.pit_timer.pending, 0); | |
3cf57fed | 536 | pit->pit_state.irq_ack = 1; |
308b0f23 SY |
537 | } |
538 | ||
539 | struct kvm_pit *kvm_create_pit(struct kvm *kvm) | |
540 | { | |
7837699f SY |
541 | struct kvm_pit *pit; |
542 | struct kvm_kpit_state *pit_state; | |
7837699f SY |
543 | |
544 | pit = kzalloc(sizeof(struct kvm_pit), GFP_KERNEL); | |
545 | if (!pit) | |
546 | return NULL; | |
547 | ||
5550af4d SY |
548 | mutex_lock(&kvm->lock); |
549 | pit->irq_source_id = kvm_request_irq_source_id(kvm); | |
550 | mutex_unlock(&kvm->lock); | |
551 | if (pit->irq_source_id < 0) | |
552 | return NULL; | |
553 | ||
7837699f SY |
554 | mutex_init(&pit->pit_state.lock); |
555 | mutex_lock(&pit->pit_state.lock); | |
3cf57fed | 556 | spin_lock_init(&pit->pit_state.inject_lock); |
7837699f SY |
557 | |
558 | /* Initialize PIO device */ | |
559 | pit->dev.read = pit_ioport_read; | |
560 | pit->dev.write = pit_ioport_write; | |
561 | pit->dev.in_range = pit_in_range; | |
562 | pit->dev.private = pit; | |
563 | kvm_io_bus_register_dev(&kvm->pio_bus, &pit->dev); | |
564 | ||
565 | pit->speaker_dev.read = speaker_ioport_read; | |
566 | pit->speaker_dev.write = speaker_ioport_write; | |
567 | pit->speaker_dev.in_range = speaker_in_range; | |
568 | pit->speaker_dev.private = pit; | |
569 | kvm_io_bus_register_dev(&kvm->pio_bus, &pit->speaker_dev); | |
570 | ||
571 | kvm->arch.vpit = pit; | |
572 | pit->kvm = kvm; | |
573 | ||
574 | pit_state = &pit->pit_state; | |
575 | pit_state->pit = pit; | |
576 | hrtimer_init(&pit_state->pit_timer.timer, | |
577 | CLOCK_MONOTONIC, HRTIMER_MODE_ABS); | |
3cf57fed MT |
578 | pit_state->irq_ack_notifier.gsi = 0; |
579 | pit_state->irq_ack_notifier.irq_acked = kvm_pit_ack_irq; | |
580 | kvm_register_irq_ack_notifier(kvm, &pit_state->irq_ack_notifier); | |
7837699f SY |
581 | mutex_unlock(&pit->pit_state.lock); |
582 | ||
308b0f23 | 583 | kvm_pit_reset(pit); |
7837699f SY |
584 | |
585 | return pit; | |
586 | } | |
587 | ||
588 | void kvm_free_pit(struct kvm *kvm) | |
589 | { | |
590 | struct hrtimer *timer; | |
591 | ||
592 | if (kvm->arch.vpit) { | |
593 | mutex_lock(&kvm->arch.vpit->pit_state.lock); | |
594 | timer = &kvm->arch.vpit->pit_state.pit_timer.timer; | |
595 | hrtimer_cancel(timer); | |
5550af4d | 596 | kvm_free_irq_source_id(kvm, kvm->arch.vpit->irq_source_id); |
7837699f SY |
597 | mutex_unlock(&kvm->arch.vpit->pit_state.lock); |
598 | kfree(kvm->arch.vpit); | |
599 | } | |
600 | } | |
601 | ||
8b2cf73c | 602 | static void __inject_pit_timer_intr(struct kvm *kvm) |
7837699f SY |
603 | { |
604 | mutex_lock(&kvm->lock); | |
5550af4d SY |
605 | kvm_set_irq(kvm, kvm->arch.vpit->irq_source_id, 0, 1); |
606 | kvm_set_irq(kvm, kvm->arch.vpit->irq_source_id, 0, 0); | |
7837699f SY |
607 | mutex_unlock(&kvm->lock); |
608 | } | |
609 | ||
610 | void kvm_inject_pit_timer_irqs(struct kvm_vcpu *vcpu) | |
611 | { | |
612 | struct kvm_pit *pit = vcpu->kvm->arch.vpit; | |
613 | struct kvm *kvm = vcpu->kvm; | |
614 | struct kvm_kpit_state *ps; | |
615 | ||
616 | if (vcpu && pit) { | |
3cf57fed | 617 | int inject = 0; |
7837699f SY |
618 | ps = &pit->pit_state; |
619 | ||
3cf57fed MT |
620 | /* Try to inject pending interrupts when |
621 | * last one has been acked. | |
622 | */ | |
623 | spin_lock(&ps->inject_lock); | |
624 | if (atomic_read(&ps->pit_timer.pending) && ps->irq_ack) { | |
625 | ps->irq_ack = 0; | |
626 | inject = 1; | |
7837699f | 627 | } |
3cf57fed MT |
628 | spin_unlock(&ps->inject_lock); |
629 | if (inject) | |
630 | __inject_pit_timer_intr(kvm); | |
7837699f SY |
631 | } |
632 | } |