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Commit | Line | Data |
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85f455f7 ED |
1 | /* |
2 | * 8259 interrupt controller emulation | |
3 | * | |
4 | * Copyright (c) 2003-2004 Fabrice Bellard | |
5 | * Copyright (c) 2007 Intel Corporation | |
9611c187 | 6 | * Copyright 2009 Red Hat, Inc. and/or its affiliates. |
85f455f7 ED |
7 | * |
8 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
9 | * of this software and associated documentation files (the "Software"), to deal | |
10 | * in the Software without restriction, including without limitation the rights | |
11 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
12 | * copies of the Software, and to permit persons to whom the Software is | |
13 | * furnished to do so, subject to the following conditions: | |
14 | * | |
15 | * The above copyright notice and this permission notice shall be included in | |
16 | * all copies or substantial portions of the Software. | |
17 | * | |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
21 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
22 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
23 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
24 | * THE SOFTWARE. | |
25 | * Authors: | |
26 | * Yaozu (Eddie) Dong <Eddie.dong@intel.com> | |
27 | * Port from Qemu. | |
28 | */ | |
29 | #include <linux/mm.h> | |
5a0e3ad6 | 30 | #include <linux/slab.h> |
3f353858 | 31 | #include <linux/bitops.h> |
85f455f7 | 32 | #include "irq.h" |
edf88417 AK |
33 | |
34 | #include <linux/kvm_host.h> | |
1000ff8d | 35 | #include "trace.h" |
85f455f7 | 36 | |
bd80158a JK |
37 | #define pr_pic_unimpl(fmt, ...) \ |
38 | pr_err_ratelimited("kvm: pic: " fmt, ## __VA_ARGS__) | |
39 | ||
073d4613 AK |
40 | static void pic_irq_request(struct kvm *kvm, int level); |
41 | ||
50a085bd JK |
42 | static void pic_lock(struct kvm_pic *s) |
43 | __acquires(&s->lock) | |
44 | { | |
f4f51050 | 45 | spin_lock(&s->lock); |
50a085bd JK |
46 | } |
47 | ||
48 | static void pic_unlock(struct kvm_pic *s) | |
49 | __releases(&s->lock) | |
50 | { | |
51 | bool wakeup = s->wakeup_needed; | |
529df65e CL |
52 | struct kvm_vcpu *vcpu, *found = NULL; |
53 | int i; | |
50a085bd JK |
54 | |
55 | s->wakeup_needed = false; | |
56 | ||
f4f51050 | 57 | spin_unlock(&s->lock); |
50a085bd JK |
58 | |
59 | if (wakeup) { | |
529df65e CL |
60 | kvm_for_each_vcpu(i, vcpu, s->kvm) { |
61 | if (kvm_apic_accept_pic_intr(vcpu)) { | |
62 | found = vcpu; | |
63 | break; | |
64 | } | |
65 | } | |
66 | ||
ae0635b3 AK |
67 | if (!found) |
68 | return; | |
69 | ||
3842d135 | 70 | kvm_make_request(KVM_REQ_EVENT, found); |
529df65e | 71 | kvm_vcpu_kick(found); |
50a085bd JK |
72 | } |
73 | } | |
74 | ||
7edd0ce0 AK |
75 | static void pic_clear_isr(struct kvm_kpic_state *s, int irq) |
76 | { | |
77 | s->isr &= ~(1 << irq); | |
938396a2 GN |
78 | if (s != &s->pics_state->pics[0]) |
79 | irq += 8; | |
eba0226b GN |
80 | /* |
81 | * We are dropping lock while calling ack notifiers since ack | |
82 | * notifier callbacks for assigned devices call into PIC recursively. | |
83 | * Other interrupt may be delivered to PIC while lock is dropped but | |
84 | * it should be safe since PIC state is already updated at this stage. | |
85 | */ | |
50a085bd | 86 | pic_unlock(s->pics_state); |
938396a2 | 87 | kvm_notify_acked_irq(s->pics_state->kvm, SELECT_PIC(irq), irq); |
50a085bd | 88 | pic_lock(s->pics_state); |
e4825800 MT |
89 | } |
90 | ||
85f455f7 ED |
91 | /* |
92 | * set irq level. If an edge is detected, then the IRR is set to 1 | |
93 | */ | |
4925663a | 94 | static inline int pic_set_irq1(struct kvm_kpic_state *s, int irq, int level) |
85f455f7 | 95 | { |
4925663a | 96 | int mask, ret = 1; |
85f455f7 ED |
97 | mask = 1 << irq; |
98 | if (s->elcr & mask) /* level triggered */ | |
99 | if (level) { | |
4925663a | 100 | ret = !(s->irr & mask); |
85f455f7 ED |
101 | s->irr |= mask; |
102 | s->last_irr |= mask; | |
103 | } else { | |
104 | s->irr &= ~mask; | |
105 | s->last_irr &= ~mask; | |
106 | } | |
107 | else /* edge triggered */ | |
108 | if (level) { | |
4925663a GN |
109 | if ((s->last_irr & mask) == 0) { |
110 | ret = !(s->irr & mask); | |
85f455f7 | 111 | s->irr |= mask; |
4925663a | 112 | } |
85f455f7 ED |
113 | s->last_irr |= mask; |
114 | } else | |
115 | s->last_irr &= ~mask; | |
4925663a GN |
116 | |
117 | return (s->imr & mask) ? -1 : ret; | |
85f455f7 ED |
118 | } |
119 | ||
120 | /* | |
121 | * return the highest priority found in mask (highest = smallest | |
122 | * number). Return 8 if no irq | |
123 | */ | |
124 | static inline int get_priority(struct kvm_kpic_state *s, int mask) | |
125 | { | |
126 | int priority; | |
127 | if (mask == 0) | |
128 | return 8; | |
129 | priority = 0; | |
130 | while ((mask & (1 << ((priority + s->priority_add) & 7))) == 0) | |
131 | priority++; | |
132 | return priority; | |
133 | } | |
134 | ||
135 | /* | |
136 | * return the pic wanted interrupt. return -1 if none | |
137 | */ | |
138 | static int pic_get_irq(struct kvm_kpic_state *s) | |
139 | { | |
140 | int mask, cur_priority, priority; | |
141 | ||
142 | mask = s->irr & ~s->imr; | |
143 | priority = get_priority(s, mask); | |
144 | if (priority == 8) | |
145 | return -1; | |
146 | /* | |
147 | * compute current priority. If special fully nested mode on the | |
148 | * master, the IRQ coming from the slave is not taken into account | |
149 | * for the priority computation. | |
150 | */ | |
151 | mask = s->isr; | |
152 | if (s->special_fully_nested_mode && s == &s->pics_state->pics[0]) | |
153 | mask &= ~(1 << 2); | |
154 | cur_priority = get_priority(s, mask); | |
155 | if (priority < cur_priority) | |
156 | /* | |
157 | * higher priority found: an irq should be generated | |
158 | */ | |
159 | return (priority + s->priority_add) & 7; | |
160 | else | |
161 | return -1; | |
162 | } | |
163 | ||
164 | /* | |
165 | * raise irq to CPU if necessary. must be called every time the active | |
166 | * irq may change | |
167 | */ | |
168 | static void pic_update_irq(struct kvm_pic *s) | |
169 | { | |
170 | int irq2, irq; | |
171 | ||
172 | irq2 = pic_get_irq(&s->pics[1]); | |
173 | if (irq2 >= 0) { | |
174 | /* | |
175 | * if irq request by slave pic, signal master PIC | |
176 | */ | |
177 | pic_set_irq1(&s->pics[0], 2, 1); | |
178 | pic_set_irq1(&s->pics[0], 2, 0); | |
179 | } | |
180 | irq = pic_get_irq(&s->pics[0]); | |
36633f32 | 181 | pic_irq_request(s->kvm, irq >= 0); |
85f455f7 ED |
182 | } |
183 | ||
6ceb9d79 HQ |
184 | void kvm_pic_update_irq(struct kvm_pic *s) |
185 | { | |
50a085bd | 186 | pic_lock(s); |
6ceb9d79 | 187 | pic_update_irq(s); |
50a085bd | 188 | pic_unlock(s); |
6ceb9d79 HQ |
189 | } |
190 | ||
1a577b72 | 191 | int kvm_pic_set_irq(struct kvm_pic *s, int irq, int irq_source_id, int level) |
85f455f7 | 192 | { |
4925663a | 193 | int ret = -1; |
85f455f7 | 194 | |
50a085bd | 195 | pic_lock(s); |
c65bbfa1 | 196 | if (irq >= 0 && irq < PIC_NUM_PINS) { |
1a577b72 MT |
197 | int irq_level = __kvm_irq_line_state(&s->irq_states[irq], |
198 | irq_source_id, level); | |
199 | ret = pic_set_irq1(&s->pics[irq >> 3], irq & 7, irq_level); | |
c65bbfa1 | 200 | pic_update_irq(s); |
1000ff8d GN |
201 | trace_kvm_pic_set_irq(irq >> 3, irq & 7, s->pics[irq >> 3].elcr, |
202 | s->pics[irq >> 3].imr, ret == 0); | |
c65bbfa1 | 203 | } |
50a085bd | 204 | pic_unlock(s); |
4925663a GN |
205 | |
206 | return ret; | |
85f455f7 ED |
207 | } |
208 | ||
1a577b72 MT |
209 | void kvm_pic_clear_all(struct kvm_pic *s, int irq_source_id) |
210 | { | |
211 | int i; | |
212 | ||
213 | pic_lock(s); | |
214 | for (i = 0; i < PIC_NUM_PINS; i++) | |
215 | __clear_bit(irq_source_id, &s->irq_states[i]); | |
216 | pic_unlock(s); | |
217 | } | |
218 | ||
85f455f7 ED |
219 | /* |
220 | * acknowledge interrupt 'irq' | |
221 | */ | |
222 | static inline void pic_intack(struct kvm_kpic_state *s, int irq) | |
223 | { | |
7edd0ce0 | 224 | s->isr |= 1 << irq; |
85f455f7 ED |
225 | /* |
226 | * We don't clear a level sensitive interrupt here | |
227 | */ | |
228 | if (!(s->elcr & (1 << irq))) | |
229 | s->irr &= ~(1 << irq); | |
eba0226b GN |
230 | |
231 | if (s->auto_eoi) { | |
232 | if (s->rotate_on_auto_eoi) | |
233 | s->priority_add = (irq + 1) & 7; | |
234 | pic_clear_isr(s, irq); | |
235 | } | |
236 | ||
85f455f7 ED |
237 | } |
238 | ||
f5244726 | 239 | int kvm_pic_read_irq(struct kvm *kvm) |
85f455f7 ED |
240 | { |
241 | int irq, irq2, intno; | |
f5244726 | 242 | struct kvm_pic *s = pic_irqchip(kvm); |
85f455f7 | 243 | |
50a085bd | 244 | pic_lock(s); |
85f455f7 ED |
245 | irq = pic_get_irq(&s->pics[0]); |
246 | if (irq >= 0) { | |
247 | pic_intack(&s->pics[0], irq); | |
248 | if (irq == 2) { | |
249 | irq2 = pic_get_irq(&s->pics[1]); | |
250 | if (irq2 >= 0) | |
251 | pic_intack(&s->pics[1], irq2); | |
252 | else | |
253 | /* | |
254 | * spurious IRQ on slave controller | |
255 | */ | |
256 | irq2 = 7; | |
257 | intno = s->pics[1].irq_base + irq2; | |
258 | irq = irq2 + 8; | |
259 | } else | |
260 | intno = s->pics[0].irq_base + irq; | |
261 | } else { | |
262 | /* | |
263 | * spurious IRQ on host controller | |
264 | */ | |
265 | irq = 7; | |
266 | intno = s->pics[0].irq_base + irq; | |
267 | } | |
268 | pic_update_irq(s); | |
50a085bd | 269 | pic_unlock(s); |
85f455f7 ED |
270 | |
271 | return intno; | |
272 | } | |
273 | ||
2fcceae1 | 274 | void kvm_pic_reset(struct kvm_kpic_state *s) |
85f455f7 | 275 | { |
d546cb40 GN |
276 | int irq, i; |
277 | struct kvm_vcpu *vcpu; | |
79c727d4 | 278 | u8 irr = s->irr, isr = s->imr; |
d546cb40 | 279 | bool found = false; |
f5244726 | 280 | |
85f455f7 ED |
281 | s->last_irr = 0; |
282 | s->irr = 0; | |
283 | s->imr = 0; | |
284 | s->isr = 0; | |
285 | s->priority_add = 0; | |
286 | s->irq_base = 0; | |
287 | s->read_reg_select = 0; | |
288 | s->poll = 0; | |
289 | s->special_mask = 0; | |
290 | s->init_state = 0; | |
291 | s->auto_eoi = 0; | |
292 | s->rotate_on_auto_eoi = 0; | |
293 | s->special_fully_nested_mode = 0; | |
294 | s->init4 = 0; | |
79c727d4 | 295 | |
d546cb40 GN |
296 | kvm_for_each_vcpu(i, vcpu, s->pics_state->kvm) |
297 | if (kvm_apic_accept_pic_intr(vcpu)) { | |
298 | found = true; | |
299 | break; | |
300 | } | |
301 | ||
302 | ||
303 | if (!found) | |
304 | return; | |
305 | ||
306 | for (irq = 0; irq < PIC_NUM_PINS/2; irq++) | |
307 | if (irr & (1 << irq) || isr & (1 << irq)) | |
308 | pic_clear_isr(s, irq); | |
85f455f7 ED |
309 | } |
310 | ||
311 | static void pic_ioport_write(void *opaque, u32 addr, u32 val) | |
312 | { | |
313 | struct kvm_kpic_state *s = opaque; | |
314 | int priority, cmd, irq; | |
315 | ||
316 | addr &= 1; | |
317 | if (addr == 0) { | |
318 | if (val & 0x10) { | |
aea218f3 GN |
319 | u8 edge_irr = s->irr & ~s->elcr; |
320 | int i; | |
749c59fd | 321 | bool found = false; |
aea218f3 GN |
322 | struct kvm_vcpu *vcpu; |
323 | ||
85f455f7 | 324 | s->init4 = val & 1; |
9ed049c3 | 325 | s->last_irr = 0; |
242ec97c | 326 | s->irr &= s->elcr; |
9ed049c3 AK |
327 | s->imr = 0; |
328 | s->priority_add = 0; | |
329 | s->special_mask = 0; | |
330 | s->read_reg_select = 0; | |
331 | if (!s->init4) { | |
332 | s->special_fully_nested_mode = 0; | |
333 | s->auto_eoi = 0; | |
334 | } | |
335 | s->init_state = 1; | |
85f455f7 | 336 | if (val & 0x02) |
bd80158a | 337 | pr_pic_unimpl("single mode not supported"); |
85f455f7 | 338 | if (val & 0x08) |
bd80158a JK |
339 | pr_pic_unimpl( |
340 | "level sensitive irq not supported"); | |
aea218f3 GN |
341 | |
342 | kvm_for_each_vcpu(i, vcpu, s->pics_state->kvm) | |
343 | if (kvm_apic_accept_pic_intr(vcpu)) { | |
344 | found = true; | |
345 | break; | |
346 | } | |
347 | ||
348 | ||
349 | if (found) | |
350 | for (irq = 0; irq < PIC_NUM_PINS/2; irq++) | |
351 | if (edge_irr & (1 << irq)) | |
352 | pic_clear_isr(s, irq); | |
85f455f7 ED |
353 | } else if (val & 0x08) { |
354 | if (val & 0x04) | |
355 | s->poll = 1; | |
356 | if (val & 0x02) | |
357 | s->read_reg_select = val & 1; | |
358 | if (val & 0x40) | |
359 | s->special_mask = (val >> 5) & 1; | |
360 | } else { | |
361 | cmd = val >> 5; | |
362 | switch (cmd) { | |
363 | case 0: | |
364 | case 4: | |
365 | s->rotate_on_auto_eoi = cmd >> 2; | |
366 | break; | |
367 | case 1: /* end of interrupt */ | |
368 | case 5: | |
369 | priority = get_priority(s, s->isr); | |
370 | if (priority != 8) { | |
371 | irq = (priority + s->priority_add) & 7; | |
85f455f7 ED |
372 | if (cmd == 5) |
373 | s->priority_add = (irq + 1) & 7; | |
eba0226b | 374 | pic_clear_isr(s, irq); |
85f455f7 ED |
375 | pic_update_irq(s->pics_state); |
376 | } | |
377 | break; | |
378 | case 3: | |
379 | irq = val & 7; | |
7edd0ce0 | 380 | pic_clear_isr(s, irq); |
85f455f7 ED |
381 | pic_update_irq(s->pics_state); |
382 | break; | |
383 | case 6: | |
384 | s->priority_add = (val + 1) & 7; | |
385 | pic_update_irq(s->pics_state); | |
386 | break; | |
387 | case 7: | |
388 | irq = val & 7; | |
85f455f7 | 389 | s->priority_add = (irq + 1) & 7; |
7edd0ce0 | 390 | pic_clear_isr(s, irq); |
85f455f7 ED |
391 | pic_update_irq(s->pics_state); |
392 | break; | |
393 | default: | |
394 | break; /* no operation */ | |
395 | } | |
396 | } | |
397 | } else | |
398 | switch (s->init_state) { | |
9195c4da GN |
399 | case 0: { /* normal mode */ |
400 | u8 imr_diff = s->imr ^ val, | |
401 | off = (s == &s->pics_state->pics[0]) ? 0 : 8; | |
85f455f7 | 402 | s->imr = val; |
9195c4da GN |
403 | for (irq = 0; irq < PIC_NUM_PINS/2; irq++) |
404 | if (imr_diff & (1 << irq)) | |
405 | kvm_fire_mask_notifiers( | |
406 | s->pics_state->kvm, | |
407 | SELECT_PIC(irq + off), | |
408 | irq + off, | |
409 | !!(s->imr & (1 << irq))); | |
85f455f7 ED |
410 | pic_update_irq(s->pics_state); |
411 | break; | |
9195c4da | 412 | } |
85f455f7 ED |
413 | case 1: |
414 | s->irq_base = val & 0xf8; | |
415 | s->init_state = 2; | |
416 | break; | |
417 | case 2: | |
418 | if (s->init4) | |
419 | s->init_state = 3; | |
420 | else | |
421 | s->init_state = 0; | |
422 | break; | |
423 | case 3: | |
424 | s->special_fully_nested_mode = (val >> 4) & 1; | |
425 | s->auto_eoi = (val >> 1) & 1; | |
426 | s->init_state = 0; | |
427 | break; | |
428 | } | |
429 | } | |
430 | ||
431 | static u32 pic_poll_read(struct kvm_kpic_state *s, u32 addr1) | |
432 | { | |
433 | int ret; | |
434 | ||
435 | ret = pic_get_irq(s); | |
436 | if (ret >= 0) { | |
437 | if (addr1 >> 7) { | |
438 | s->pics_state->pics[0].isr &= ~(1 << 2); | |
439 | s->pics_state->pics[0].irr &= ~(1 << 2); | |
440 | } | |
441 | s->irr &= ~(1 << ret); | |
7edd0ce0 | 442 | pic_clear_isr(s, ret); |
85f455f7 ED |
443 | if (addr1 >> 7 || ret != 2) |
444 | pic_update_irq(s->pics_state); | |
445 | } else { | |
446 | ret = 0x07; | |
447 | pic_update_irq(s->pics_state); | |
448 | } | |
449 | ||
450 | return ret; | |
451 | } | |
452 | ||
453 | static u32 pic_ioport_read(void *opaque, u32 addr1) | |
454 | { | |
455 | struct kvm_kpic_state *s = opaque; | |
456 | unsigned int addr; | |
457 | int ret; | |
458 | ||
459 | addr = addr1; | |
460 | addr &= 1; | |
461 | if (s->poll) { | |
462 | ret = pic_poll_read(s, addr1); | |
463 | s->poll = 0; | |
464 | } else | |
465 | if (addr == 0) | |
466 | if (s->read_reg_select) | |
467 | ret = s->isr; | |
468 | else | |
469 | ret = s->irr; | |
470 | else | |
471 | ret = s->imr; | |
472 | return ret; | |
473 | } | |
474 | ||
475 | static void elcr_ioport_write(void *opaque, u32 addr, u32 val) | |
476 | { | |
477 | struct kvm_kpic_state *s = opaque; | |
478 | s->elcr = val & s->elcr_mask; | |
479 | } | |
480 | ||
481 | static u32 elcr_ioport_read(void *opaque, u32 addr1) | |
482 | { | |
483 | struct kvm_kpic_state *s = opaque; | |
484 | return s->elcr; | |
485 | } | |
486 | ||
bda9020e | 487 | static int picdev_in_range(gpa_t addr) |
85f455f7 ED |
488 | { |
489 | switch (addr) { | |
490 | case 0x20: | |
491 | case 0x21: | |
492 | case 0xa0: | |
493 | case 0xa1: | |
494 | case 0x4d0: | |
495 | case 0x4d1: | |
496 | return 1; | |
497 | default: | |
498 | return 0; | |
499 | } | |
500 | } | |
501 | ||
743eeb0b | 502 | static int picdev_write(struct kvm_pic *s, |
85f455f7 ED |
503 | gpa_t addr, int len, const void *val) |
504 | { | |
85f455f7 | 505 | unsigned char data = *(unsigned char *)val; |
bda9020e MT |
506 | if (!picdev_in_range(addr)) |
507 | return -EOPNOTSUPP; | |
85f455f7 ED |
508 | |
509 | if (len != 1) { | |
bd80158a | 510 | pr_pic_unimpl("non byte write\n"); |
bda9020e | 511 | return 0; |
85f455f7 | 512 | } |
50a085bd | 513 | pic_lock(s); |
85f455f7 ED |
514 | switch (addr) { |
515 | case 0x20: | |
516 | case 0x21: | |
517 | case 0xa0: | |
518 | case 0xa1: | |
519 | pic_ioport_write(&s->pics[addr >> 7], addr, data); | |
520 | break; | |
521 | case 0x4d0: | |
522 | case 0x4d1: | |
523 | elcr_ioport_write(&s->pics[addr & 1], addr, data); | |
524 | break; | |
525 | } | |
50a085bd | 526 | pic_unlock(s); |
bda9020e | 527 | return 0; |
85f455f7 ED |
528 | } |
529 | ||
743eeb0b | 530 | static int picdev_read(struct kvm_pic *s, |
bda9020e | 531 | gpa_t addr, int len, void *val) |
85f455f7 | 532 | { |
85f455f7 | 533 | unsigned char data = 0; |
bda9020e MT |
534 | if (!picdev_in_range(addr)) |
535 | return -EOPNOTSUPP; | |
85f455f7 ED |
536 | |
537 | if (len != 1) { | |
bd80158a | 538 | pr_pic_unimpl("non byte read\n"); |
bda9020e | 539 | return 0; |
85f455f7 | 540 | } |
50a085bd | 541 | pic_lock(s); |
85f455f7 ED |
542 | switch (addr) { |
543 | case 0x20: | |
544 | case 0x21: | |
545 | case 0xa0: | |
546 | case 0xa1: | |
547 | data = pic_ioport_read(&s->pics[addr >> 7], addr); | |
548 | break; | |
549 | case 0x4d0: | |
550 | case 0x4d1: | |
551 | data = elcr_ioport_read(&s->pics[addr & 1], addr); | |
552 | break; | |
553 | } | |
554 | *(unsigned char *)val = data; | |
50a085bd | 555 | pic_unlock(s); |
bda9020e | 556 | return 0; |
85f455f7 ED |
557 | } |
558 | ||
743eeb0b SL |
559 | static int picdev_master_write(struct kvm_io_device *dev, |
560 | gpa_t addr, int len, const void *val) | |
561 | { | |
562 | return picdev_write(container_of(dev, struct kvm_pic, dev_master), | |
563 | addr, len, val); | |
564 | } | |
565 | ||
566 | static int picdev_master_read(struct kvm_io_device *dev, | |
567 | gpa_t addr, int len, void *val) | |
568 | { | |
569 | return picdev_read(container_of(dev, struct kvm_pic, dev_master), | |
570 | addr, len, val); | |
571 | } | |
572 | ||
573 | static int picdev_slave_write(struct kvm_io_device *dev, | |
574 | gpa_t addr, int len, const void *val) | |
575 | { | |
576 | return picdev_write(container_of(dev, struct kvm_pic, dev_slave), | |
577 | addr, len, val); | |
578 | } | |
579 | ||
580 | static int picdev_slave_read(struct kvm_io_device *dev, | |
581 | gpa_t addr, int len, void *val) | |
582 | { | |
583 | return picdev_read(container_of(dev, struct kvm_pic, dev_slave), | |
584 | addr, len, val); | |
585 | } | |
586 | ||
587 | static int picdev_eclr_write(struct kvm_io_device *dev, | |
588 | gpa_t addr, int len, const void *val) | |
589 | { | |
590 | return picdev_write(container_of(dev, struct kvm_pic, dev_eclr), | |
591 | addr, len, val); | |
592 | } | |
593 | ||
594 | static int picdev_eclr_read(struct kvm_io_device *dev, | |
595 | gpa_t addr, int len, void *val) | |
596 | { | |
597 | return picdev_read(container_of(dev, struct kvm_pic, dev_eclr), | |
598 | addr, len, val); | |
599 | } | |
600 | ||
85f455f7 ED |
601 | /* |
602 | * callback when PIC0 irq status changed | |
603 | */ | |
073d4613 | 604 | static void pic_irq_request(struct kvm *kvm, int level) |
85f455f7 | 605 | { |
e4825800 | 606 | struct kvm_pic *s = pic_irqchip(kvm); |
85f455f7 | 607 | |
7049467b | 608 | if (!s->output) |
50a085bd | 609 | s->wakeup_needed = true; |
7049467b | 610 | s->output = level; |
85f455f7 ED |
611 | } |
612 | ||
743eeb0b SL |
613 | static const struct kvm_io_device_ops picdev_master_ops = { |
614 | .read = picdev_master_read, | |
615 | .write = picdev_master_write, | |
616 | }; | |
617 | ||
618 | static const struct kvm_io_device_ops picdev_slave_ops = { | |
619 | .read = picdev_slave_read, | |
620 | .write = picdev_slave_write, | |
621 | }; | |
622 | ||
623 | static const struct kvm_io_device_ops picdev_eclr_ops = { | |
624 | .read = picdev_eclr_read, | |
625 | .write = picdev_eclr_write, | |
d76685c4 GH |
626 | }; |
627 | ||
85f455f7 ED |
628 | struct kvm_pic *kvm_create_pic(struct kvm *kvm) |
629 | { | |
630 | struct kvm_pic *s; | |
090b7aff GH |
631 | int ret; |
632 | ||
85f455f7 ED |
633 | s = kzalloc(sizeof(struct kvm_pic), GFP_KERNEL); |
634 | if (!s) | |
635 | return NULL; | |
f4f51050 | 636 | spin_lock_init(&s->lock); |
3f353858 | 637 | s->kvm = kvm; |
85f455f7 ED |
638 | s->pics[0].elcr_mask = 0xf8; |
639 | s->pics[1].elcr_mask = 0xde; | |
85f455f7 ED |
640 | s->pics[0].pics_state = s; |
641 | s->pics[1].pics_state = s; | |
642 | ||
643 | /* | |
644 | * Initialize PIO device | |
645 | */ | |
743eeb0b SL |
646 | kvm_iodevice_init(&s->dev_master, &picdev_master_ops); |
647 | kvm_iodevice_init(&s->dev_slave, &picdev_slave_ops); | |
648 | kvm_iodevice_init(&s->dev_eclr, &picdev_eclr_ops); | |
79fac95e | 649 | mutex_lock(&kvm->slots_lock); |
743eeb0b SL |
650 | ret = kvm_io_bus_register_dev(kvm, KVM_PIO_BUS, 0x20, 2, |
651 | &s->dev_master); | |
652 | if (ret < 0) | |
653 | goto fail_unlock; | |
654 | ||
655 | ret = kvm_io_bus_register_dev(kvm, KVM_PIO_BUS, 0xa0, 2, &s->dev_slave); | |
656 | if (ret < 0) | |
657 | goto fail_unreg_2; | |
658 | ||
659 | ret = kvm_io_bus_register_dev(kvm, KVM_PIO_BUS, 0x4d0, 2, &s->dev_eclr); | |
660 | if (ret < 0) | |
661 | goto fail_unreg_1; | |
662 | ||
79fac95e | 663 | mutex_unlock(&kvm->slots_lock); |
090b7aff | 664 | |
85f455f7 | 665 | return s; |
743eeb0b SL |
666 | |
667 | fail_unreg_1: | |
668 | kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS, &s->dev_slave); | |
669 | ||
670 | fail_unreg_2: | |
671 | kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS, &s->dev_master); | |
672 | ||
673 | fail_unlock: | |
674 | mutex_unlock(&kvm->slots_lock); | |
675 | ||
676 | kfree(s); | |
677 | ||
678 | return NULL; | |
85f455f7 | 679 | } |
72bb2fcd WY |
680 | |
681 | void kvm_destroy_pic(struct kvm *kvm) | |
682 | { | |
683 | struct kvm_pic *vpic = kvm->arch.vpic; | |
684 | ||
685 | if (vpic) { | |
743eeb0b SL |
686 | kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS, &vpic->dev_master); |
687 | kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS, &vpic->dev_slave); | |
688 | kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS, &vpic->dev_eclr); | |
72bb2fcd WY |
689 | kvm->arch.vpic = NULL; |
690 | kfree(vpic); | |
691 | } | |
692 | } |