Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Intel IO-APIC support for multi-Pentium hosts. | |
3 | * | |
4 | * Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar, Hajnalka Szabo | |
5 | * | |
6 | * Many thanks to Stig Venaas for trying out countless experimental | |
7 | * patches and reporting/debugging problems patiently! | |
8 | * | |
9 | * (c) 1999, Multiple IO-APIC support, developed by | |
10 | * Ken-ichi Yaku <yaku@css1.kbnes.nec.co.jp> and | |
11 | * Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>, | |
12 | * further tested and cleaned up by Zach Brown <zab@redhat.com> | |
13 | * and Ingo Molnar <mingo@redhat.com> | |
14 | * | |
15 | * Fixes | |
16 | * Maciej W. Rozycki : Bits for genuine 82489DX APICs; | |
17 | * thanks to Eric Gilmore | |
18 | * and Rolf G. Tews | |
19 | * for testing these extensively | |
20 | * Paul Diefenbaugh : Added full ACPI support | |
21 | */ | |
22 | ||
23 | #include <linux/mm.h> | |
1da177e4 LT |
24 | #include <linux/interrupt.h> |
25 | #include <linux/init.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/sched.h> | |
1da177e4 | 28 | #include <linux/smp_lock.h> |
589e367f | 29 | #include <linux/pci.h> |
1da177e4 LT |
30 | #include <linux/mc146818rtc.h> |
31 | #include <linux/acpi.h> | |
32 | #include <linux/sysdev.h> | |
3b7d1921 | 33 | #include <linux/msi.h> |
ab688059 AK |
34 | #ifdef CONFIG_ACPI |
35 | #include <acpi/acpi_bus.h> | |
36 | #endif | |
1da177e4 LT |
37 | |
38 | #include <asm/io.h> | |
39 | #include <asm/smp.h> | |
40 | #include <asm/desc.h> | |
41 | #include <asm/proto.h> | |
42 | #include <asm/mach_apic.h> | |
8d916406 | 43 | #include <asm/acpi.h> |
ca8642f6 | 44 | #include <asm/dma.h> |
3e4ff115 | 45 | #include <asm/nmi.h> |
589e367f | 46 | #include <asm/msidef.h> |
8b955b0d | 47 | #include <asm/hypertransport.h> |
1da177e4 | 48 | |
550f2299 | 49 | static int assign_irq_vector(int irq, cpumask_t mask); |
04b9267b | 50 | |
1da177e4 LT |
51 | #define __apicdebuginit __init |
52 | ||
53 | int sis_apic_bug; /* not actually supported, dummy for compile */ | |
54 | ||
14d98cad AK |
55 | static int no_timer_check; |
56 | ||
2c8c0e6b | 57 | static int disable_timer_pin_1 __initdata; |
66759a01 | 58 | |
9b2a13b9 | 59 | int timer_over_8254 __initdata = 0; |
ab9b32ee | 60 | |
1008fddc EB |
61 | /* Where if anywhere is the i8259 connect in external int mode */ |
62 | static struct { int pin, apic; } ioapic_i8259 = { -1, -1 }; | |
63 | ||
1da177e4 | 64 | static DEFINE_SPINLOCK(ioapic_lock); |
0a1ad60d | 65 | static DEFINE_SPINLOCK(vector_lock); |
1da177e4 LT |
66 | |
67 | /* | |
68 | * # of IRQ routing registers | |
69 | */ | |
70 | int nr_ioapic_registers[MAX_IO_APICS]; | |
71 | ||
72 | /* | |
73 | * Rough estimation of how many shared IRQs there are, can | |
74 | * be changed anytime. | |
75 | */ | |
6004e1b7 | 76 | #define MAX_PLUS_SHARED_IRQS NR_IRQ_VECTORS |
1da177e4 LT |
77 | #define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS) |
78 | ||
79 | /* | |
80 | * This is performance-critical, we want to do it O(1) | |
81 | * | |
82 | * the indexing order of this array favors 1:1 mappings | |
83 | * between pins and IRQs. | |
84 | */ | |
85 | ||
86 | static struct irq_pin_list { | |
87 | short apic, pin, next; | |
88 | } irq_2_pin[PIN_MAP_SIZE]; | |
89 | ||
54d5d424 AR |
90 | #define __DO_ACTION(R, ACTION, FINAL) \ |
91 | \ | |
92 | { \ | |
93 | int pin; \ | |
94 | struct irq_pin_list *entry = irq_2_pin + irq; \ | |
95 | \ | |
6004e1b7 | 96 | BUG_ON(irq >= NR_IRQS); \ |
54d5d424 AR |
97 | for (;;) { \ |
98 | unsigned int reg; \ | |
99 | pin = entry->pin; \ | |
100 | if (pin == -1) \ | |
101 | break; \ | |
102 | reg = io_apic_read(entry->apic, 0x10 + R + pin*2); \ | |
103 | reg ACTION; \ | |
104 | io_apic_modify(entry->apic, reg); \ | |
105 | if (!entry->next) \ | |
106 | break; \ | |
107 | entry = irq_2_pin + entry->next; \ | |
108 | } \ | |
109 | FINAL; \ | |
110 | } | |
111 | ||
eea0e11c AK |
112 | union entry_union { |
113 | struct { u32 w1, w2; }; | |
114 | struct IO_APIC_route_entry entry; | |
115 | }; | |
116 | ||
117 | static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin) | |
118 | { | |
119 | union entry_union eu; | |
120 | unsigned long flags; | |
121 | spin_lock_irqsave(&ioapic_lock, flags); | |
122 | eu.w1 = io_apic_read(apic, 0x10 + 2 * pin); | |
123 | eu.w2 = io_apic_read(apic, 0x11 + 2 * pin); | |
124 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
125 | return eu.entry; | |
126 | } | |
127 | ||
128 | static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e) | |
129 | { | |
130 | unsigned long flags; | |
131 | union entry_union eu; | |
132 | eu.entry = e; | |
133 | spin_lock_irqsave(&ioapic_lock, flags); | |
134 | io_apic_write(apic, 0x10 + 2*pin, eu.w1); | |
135 | io_apic_write(apic, 0x11 + 2*pin, eu.w2); | |
136 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
137 | } | |
138 | ||
54d5d424 | 139 | #ifdef CONFIG_SMP |
550f2299 EB |
140 | static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, u8 vector) |
141 | { | |
142 | int apic, pin; | |
143 | struct irq_pin_list *entry = irq_2_pin + irq; | |
144 | ||
145 | BUG_ON(irq >= NR_IRQS); | |
146 | for (;;) { | |
147 | unsigned int reg; | |
148 | apic = entry->apic; | |
149 | pin = entry->pin; | |
150 | if (pin == -1) | |
151 | break; | |
152 | io_apic_write(apic, 0x11 + pin*2, dest); | |
153 | reg = io_apic_read(apic, 0x10 + pin*2); | |
154 | reg &= ~0x000000ff; | |
155 | reg |= vector; | |
156 | io_apic_modify(apic, reg); | |
157 | if (!entry->next) | |
158 | break; | |
159 | entry = irq_2_pin + entry->next; | |
160 | } | |
161 | } | |
162 | ||
54d5d424 AR |
163 | static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask) |
164 | { | |
165 | unsigned long flags; | |
166 | unsigned int dest; | |
167 | cpumask_t tmp; | |
550f2299 | 168 | int vector; |
54d5d424 AR |
169 | |
170 | cpus_and(tmp, mask, cpu_online_map); | |
171 | if (cpus_empty(tmp)) | |
172 | tmp = TARGET_CPUS; | |
173 | ||
174 | cpus_and(mask, tmp, CPU_MASK_ALL); | |
175 | ||
550f2299 EB |
176 | vector = assign_irq_vector(irq, mask); |
177 | if (vector < 0) | |
178 | return; | |
179 | ||
180 | cpus_clear(tmp); | |
181 | cpu_set(vector >> 8, tmp); | |
182 | dest = cpu_mask_to_apicid(tmp); | |
54d5d424 AR |
183 | |
184 | /* | |
185 | * Only the high 8 bits are valid. | |
186 | */ | |
187 | dest = SET_APIC_LOGICAL_ID(dest); | |
188 | ||
189 | spin_lock_irqsave(&ioapic_lock, flags); | |
550f2299 | 190 | __target_IO_APIC_irq(irq, dest, vector & 0xff); |
04b9267b | 191 | set_native_irq_info(irq, mask); |
54d5d424 AR |
192 | spin_unlock_irqrestore(&ioapic_lock, flags); |
193 | } | |
194 | #endif | |
195 | ||
1da177e4 LT |
196 | /* |
197 | * The common case is 1:1 IRQ<->pin mappings. Sometimes there are | |
198 | * shared ISA-space IRQs, so we have to support them. We are super | |
199 | * fast in the common case, and fast for shared ISA-space IRQs. | |
200 | */ | |
201 | static void add_pin_to_irq(unsigned int irq, int apic, int pin) | |
202 | { | |
203 | static int first_free_entry = NR_IRQS; | |
204 | struct irq_pin_list *entry = irq_2_pin + irq; | |
205 | ||
6004e1b7 | 206 | BUG_ON(irq >= NR_IRQS); |
1da177e4 LT |
207 | while (entry->next) |
208 | entry = irq_2_pin + entry->next; | |
209 | ||
210 | if (entry->pin != -1) { | |
211 | entry->next = first_free_entry; | |
212 | entry = irq_2_pin + entry->next; | |
213 | if (++first_free_entry >= PIN_MAP_SIZE) | |
6004e1b7 | 214 | panic("io_apic.c: ran out of irq_2_pin entries!"); |
1da177e4 LT |
215 | } |
216 | entry->apic = apic; | |
217 | entry->pin = pin; | |
218 | } | |
219 | ||
1da177e4 LT |
220 | |
221 | #define DO_ACTION(name,R,ACTION, FINAL) \ | |
222 | \ | |
223 | static void name##_IO_APIC_irq (unsigned int irq) \ | |
224 | __DO_ACTION(R, ACTION, FINAL) | |
225 | ||
226 | DO_ACTION( __mask, 0, |= 0x00010000, io_apic_sync(entry->apic) ) | |
227 | /* mask = 1 */ | |
228 | DO_ACTION( __unmask, 0, &= 0xfffeffff, ) | |
229 | /* mask = 0 */ | |
230 | ||
231 | static void mask_IO_APIC_irq (unsigned int irq) | |
232 | { | |
233 | unsigned long flags; | |
234 | ||
235 | spin_lock_irqsave(&ioapic_lock, flags); | |
236 | __mask_IO_APIC_irq(irq); | |
237 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
238 | } | |
239 | ||
240 | static void unmask_IO_APIC_irq (unsigned int irq) | |
241 | { | |
242 | unsigned long flags; | |
243 | ||
244 | spin_lock_irqsave(&ioapic_lock, flags); | |
245 | __unmask_IO_APIC_irq(irq); | |
246 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
247 | } | |
248 | ||
249 | static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin) | |
250 | { | |
251 | struct IO_APIC_route_entry entry; | |
1da177e4 LT |
252 | |
253 | /* Check delivery_mode to be sure we're not clearing an SMI pin */ | |
eea0e11c | 254 | entry = ioapic_read_entry(apic, pin); |
1da177e4 LT |
255 | if (entry.delivery_mode == dest_SMI) |
256 | return; | |
257 | /* | |
258 | * Disable it in the IO-APIC irq-routing table: | |
259 | */ | |
260 | memset(&entry, 0, sizeof(entry)); | |
261 | entry.mask = 1; | |
eea0e11c | 262 | ioapic_write_entry(apic, pin, entry); |
1da177e4 LT |
263 | } |
264 | ||
265 | static void clear_IO_APIC (void) | |
266 | { | |
267 | int apic, pin; | |
268 | ||
269 | for (apic = 0; apic < nr_ioapics; apic++) | |
270 | for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) | |
271 | clear_IO_APIC_pin(apic, pin); | |
272 | } | |
273 | ||
1da177e4 LT |
274 | int skip_ioapic_setup; |
275 | int ioapic_force; | |
276 | ||
277 | /* dummy parsing: see setup.c */ | |
278 | ||
279 | static int __init disable_ioapic_setup(char *str) | |
280 | { | |
281 | skip_ioapic_setup = 1; | |
2c8c0e6b | 282 | return 0; |
1da177e4 | 283 | } |
2c8c0e6b | 284 | early_param("noapic", disable_ioapic_setup); |
1da177e4 | 285 | |
2c8c0e6b AK |
286 | /* Actually the next is obsolete, but keep it for paranoid reasons -AK */ |
287 | static int __init disable_timer_pin_setup(char *arg) | |
1da177e4 | 288 | { |
2c8c0e6b | 289 | disable_timer_pin_1 = 1; |
1da177e4 LT |
290 | return 1; |
291 | } | |
2c8c0e6b | 292 | __setup("disable_timer_pin_1", disable_timer_pin_setup); |
1da177e4 | 293 | |
ab9b32ee AK |
294 | static int __init setup_disable_8254_timer(char *s) |
295 | { | |
296 | timer_over_8254 = -1; | |
297 | return 1; | |
298 | } | |
299 | static int __init setup_enable_8254_timer(char *s) | |
300 | { | |
301 | timer_over_8254 = 2; | |
302 | return 1; | |
303 | } | |
304 | ||
305 | __setup("disable_8254_timer", setup_disable_8254_timer); | |
306 | __setup("enable_8254_timer", setup_enable_8254_timer); | |
307 | ||
1da177e4 | 308 | |
1da177e4 LT |
309 | /* |
310 | * Find the IRQ entry number of a certain pin. | |
311 | */ | |
312 | static int find_irq_entry(int apic, int pin, int type) | |
313 | { | |
314 | int i; | |
315 | ||
316 | for (i = 0; i < mp_irq_entries; i++) | |
317 | if (mp_irqs[i].mpc_irqtype == type && | |
318 | (mp_irqs[i].mpc_dstapic == mp_ioapics[apic].mpc_apicid || | |
319 | mp_irqs[i].mpc_dstapic == MP_APIC_ALL) && | |
320 | mp_irqs[i].mpc_dstirq == pin) | |
321 | return i; | |
322 | ||
323 | return -1; | |
324 | } | |
325 | ||
326 | /* | |
327 | * Find the pin to which IRQ[irq] (ISA) is connected | |
328 | */ | |
1008fddc | 329 | static int __init find_isa_irq_pin(int irq, int type) |
1da177e4 LT |
330 | { |
331 | int i; | |
332 | ||
333 | for (i = 0; i < mp_irq_entries; i++) { | |
334 | int lbus = mp_irqs[i].mpc_srcbus; | |
335 | ||
55f05ffa | 336 | if (test_bit(lbus, mp_bus_not_pci) && |
1da177e4 LT |
337 | (mp_irqs[i].mpc_irqtype == type) && |
338 | (mp_irqs[i].mpc_srcbusirq == irq)) | |
339 | ||
340 | return mp_irqs[i].mpc_dstirq; | |
341 | } | |
342 | return -1; | |
343 | } | |
344 | ||
1008fddc EB |
345 | static int __init find_isa_irq_apic(int irq, int type) |
346 | { | |
347 | int i; | |
348 | ||
349 | for (i = 0; i < mp_irq_entries; i++) { | |
350 | int lbus = mp_irqs[i].mpc_srcbus; | |
351 | ||
55f05ffa | 352 | if (test_bit(lbus, mp_bus_not_pci) && |
1008fddc EB |
353 | (mp_irqs[i].mpc_irqtype == type) && |
354 | (mp_irqs[i].mpc_srcbusirq == irq)) | |
355 | break; | |
356 | } | |
357 | if (i < mp_irq_entries) { | |
358 | int apic; | |
359 | for(apic = 0; apic < nr_ioapics; apic++) { | |
360 | if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic) | |
361 | return apic; | |
362 | } | |
363 | } | |
364 | ||
365 | return -1; | |
366 | } | |
367 | ||
1da177e4 LT |
368 | /* |
369 | * Find a specific PCI IRQ entry. | |
370 | * Not an __init, possibly needed by modules | |
371 | */ | |
372 | static int pin_2_irq(int idx, int apic, int pin); | |
373 | ||
374 | int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin) | |
375 | { | |
376 | int apic, i, best_guess = -1; | |
377 | ||
378 | apic_printk(APIC_DEBUG, "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n", | |
379 | bus, slot, pin); | |
380 | if (mp_bus_id_to_pci_bus[bus] == -1) { | |
381 | apic_printk(APIC_VERBOSE, "PCI BIOS passed nonexistent PCI bus %d!\n", bus); | |
382 | return -1; | |
383 | } | |
384 | for (i = 0; i < mp_irq_entries; i++) { | |
385 | int lbus = mp_irqs[i].mpc_srcbus; | |
386 | ||
387 | for (apic = 0; apic < nr_ioapics; apic++) | |
388 | if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic || | |
389 | mp_irqs[i].mpc_dstapic == MP_APIC_ALL) | |
390 | break; | |
391 | ||
55f05ffa | 392 | if (!test_bit(lbus, mp_bus_not_pci) && |
1da177e4 LT |
393 | !mp_irqs[i].mpc_irqtype && |
394 | (bus == lbus) && | |
395 | (slot == ((mp_irqs[i].mpc_srcbusirq >> 2) & 0x1f))) { | |
396 | int irq = pin_2_irq(i,apic,mp_irqs[i].mpc_dstirq); | |
397 | ||
398 | if (!(apic || IO_APIC_IRQ(irq))) | |
399 | continue; | |
400 | ||
401 | if (pin == (mp_irqs[i].mpc_srcbusirq & 3)) | |
402 | return irq; | |
403 | /* | |
404 | * Use the first all-but-pin matching entry as a | |
405 | * best-guess fuzzy result for broken mptables. | |
406 | */ | |
407 | if (best_guess < 0) | |
408 | best_guess = irq; | |
409 | } | |
410 | } | |
6004e1b7 | 411 | BUG_ON(best_guess >= NR_IRQS); |
1da177e4 LT |
412 | return best_guess; |
413 | } | |
414 | ||
1da177e4 LT |
415 | /* ISA interrupts are always polarity zero edge triggered, |
416 | * when listed as conforming in the MP table. */ | |
417 | ||
418 | #define default_ISA_trigger(idx) (0) | |
419 | #define default_ISA_polarity(idx) (0) | |
420 | ||
421 | /* PCI interrupts are always polarity one level triggered, | |
422 | * when listed as conforming in the MP table. */ | |
423 | ||
424 | #define default_PCI_trigger(idx) (1) | |
425 | #define default_PCI_polarity(idx) (1) | |
426 | ||
1da177e4 LT |
427 | static int __init MPBIOS_polarity(int idx) |
428 | { | |
429 | int bus = mp_irqs[idx].mpc_srcbus; | |
430 | int polarity; | |
431 | ||
432 | /* | |
433 | * Determine IRQ line polarity (high active or low active): | |
434 | */ | |
435 | switch (mp_irqs[idx].mpc_irqflag & 3) | |
436 | { | |
437 | case 0: /* conforms, ie. bus-type dependent polarity */ | |
55f05ffa AK |
438 | if (test_bit(bus, mp_bus_not_pci)) |
439 | polarity = default_ISA_polarity(idx); | |
440 | else | |
441 | polarity = default_PCI_polarity(idx); | |
1da177e4 | 442 | break; |
1da177e4 LT |
443 | case 1: /* high active */ |
444 | { | |
445 | polarity = 0; | |
446 | break; | |
447 | } | |
448 | case 2: /* reserved */ | |
449 | { | |
450 | printk(KERN_WARNING "broken BIOS!!\n"); | |
451 | polarity = 1; | |
452 | break; | |
453 | } | |
454 | case 3: /* low active */ | |
455 | { | |
456 | polarity = 1; | |
457 | break; | |
458 | } | |
459 | default: /* invalid */ | |
460 | { | |
461 | printk(KERN_WARNING "broken BIOS!!\n"); | |
462 | polarity = 1; | |
463 | break; | |
464 | } | |
465 | } | |
466 | return polarity; | |
467 | } | |
468 | ||
469 | static int MPBIOS_trigger(int idx) | |
470 | { | |
471 | int bus = mp_irqs[idx].mpc_srcbus; | |
472 | int trigger; | |
473 | ||
474 | /* | |
475 | * Determine IRQ trigger mode (edge or level sensitive): | |
476 | */ | |
477 | switch ((mp_irqs[idx].mpc_irqflag>>2) & 3) | |
478 | { | |
479 | case 0: /* conforms, ie. bus-type dependent */ | |
55f05ffa AK |
480 | if (test_bit(bus, mp_bus_not_pci)) |
481 | trigger = default_ISA_trigger(idx); | |
482 | else | |
483 | trigger = default_PCI_trigger(idx); | |
1da177e4 | 484 | break; |
1da177e4 LT |
485 | case 1: /* edge */ |
486 | { | |
487 | trigger = 0; | |
488 | break; | |
489 | } | |
490 | case 2: /* reserved */ | |
491 | { | |
492 | printk(KERN_WARNING "broken BIOS!!\n"); | |
493 | trigger = 1; | |
494 | break; | |
495 | } | |
496 | case 3: /* level */ | |
497 | { | |
498 | trigger = 1; | |
499 | break; | |
500 | } | |
501 | default: /* invalid */ | |
502 | { | |
503 | printk(KERN_WARNING "broken BIOS!!\n"); | |
504 | trigger = 0; | |
505 | break; | |
506 | } | |
507 | } | |
508 | return trigger; | |
509 | } | |
510 | ||
511 | static inline int irq_polarity(int idx) | |
512 | { | |
513 | return MPBIOS_polarity(idx); | |
514 | } | |
515 | ||
516 | static inline int irq_trigger(int idx) | |
517 | { | |
518 | return MPBIOS_trigger(idx); | |
519 | } | |
520 | ||
521 | static int pin_2_irq(int idx, int apic, int pin) | |
522 | { | |
523 | int irq, i; | |
524 | int bus = mp_irqs[idx].mpc_srcbus; | |
525 | ||
526 | /* | |
527 | * Debugging check, we are in big trouble if this message pops up! | |
528 | */ | |
529 | if (mp_irqs[idx].mpc_dstirq != pin) | |
530 | printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n"); | |
531 | ||
55f05ffa AK |
532 | if (test_bit(bus, mp_bus_not_pci)) { |
533 | irq = mp_irqs[idx].mpc_srcbusirq; | |
534 | } else { | |
535 | /* | |
536 | * PCI IRQs are mapped in order | |
537 | */ | |
538 | i = irq = 0; | |
539 | while (i < apic) | |
540 | irq += nr_ioapic_registers[i++]; | |
541 | irq += pin; | |
1da177e4 | 542 | } |
6004e1b7 | 543 | BUG_ON(irq >= NR_IRQS); |
1da177e4 LT |
544 | return irq; |
545 | } | |
546 | ||
547 | static inline int IO_APIC_irq_trigger(int irq) | |
548 | { | |
549 | int apic, idx, pin; | |
550 | ||
551 | for (apic = 0; apic < nr_ioapics; apic++) { | |
552 | for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) { | |
553 | idx = find_irq_entry(apic,pin,mp_INT); | |
554 | if ((idx != -1) && (irq == pin_2_irq(idx,apic,pin))) | |
555 | return irq_trigger(idx); | |
556 | } | |
557 | } | |
558 | /* | |
559 | * nonexistent IRQs are edge default | |
560 | */ | |
561 | return 0; | |
562 | } | |
563 | ||
564 | /* irq_vectors is indexed by the sum of all RTEs in all I/O APICs. */ | |
550f2299 | 565 | unsigned int irq_vector[NR_IRQ_VECTORS] __read_mostly = { FIRST_EXTERNAL_VECTOR, 0 }; |
1da177e4 | 566 | |
550f2299 | 567 | static int __assign_irq_vector(int irq, cpumask_t mask) |
1da177e4 | 568 | { |
550f2299 EB |
569 | /* |
570 | * NOTE! The local APIC isn't very good at handling | |
571 | * multiple interrupts at the same interrupt level. | |
572 | * As the interrupt level is determined by taking the | |
573 | * vector number and shifting that right by 4, we | |
574 | * want to spread these out a bit so that they don't | |
575 | * all fall in the same interrupt level. | |
576 | * | |
577 | * Also, we've got to be careful not to trash gate | |
578 | * 0x80, because int 0x80 is hm, kind of importantish. ;) | |
579 | */ | |
580 | static struct { | |
581 | int vector; | |
582 | int offset; | |
583 | } pos[NR_CPUS] = { [ 0 ... NR_CPUS - 1] = {FIRST_DEVICE_VECTOR, 0} }; | |
584 | int old_vector = -1; | |
585 | int cpu; | |
1da177e4 | 586 | |
04b9267b | 587 | BUG_ON((unsigned)irq >= NR_IRQ_VECTORS); |
0a1ad60d | 588 | |
550f2299 EB |
589 | if (IO_APIC_VECTOR(irq) > 0) |
590 | old_vector = IO_APIC_VECTOR(irq); | |
591 | if ((old_vector > 0) && cpu_isset(old_vector >> 8, mask)) { | |
592 | return old_vector; | |
0a1ad60d | 593 | } |
550f2299 EB |
594 | |
595 | for_each_cpu_mask(cpu, mask) { | |
596 | int vector, offset; | |
597 | vector = pos[cpu].vector; | |
598 | offset = pos[cpu].offset; | |
1da177e4 | 599 | next: |
550f2299 EB |
600 | vector += 8; |
601 | if (vector >= FIRST_SYSTEM_VECTOR) { | |
602 | /* If we run out of vectors on large boxen, must share them. */ | |
603 | offset = (offset + 1) % 8; | |
604 | vector = FIRST_DEVICE_VECTOR + offset; | |
605 | } | |
606 | if (unlikely(pos[cpu].vector == vector)) | |
607 | continue; | |
608 | if (vector == IA32_SYSCALL_VECTOR) | |
609 | goto next; | |
610 | if (per_cpu(vector_irq, cpu)[vector] != -1) | |
611 | goto next; | |
612 | /* Found one! */ | |
613 | pos[cpu].vector = vector; | |
614 | pos[cpu].offset = offset; | |
615 | if (old_vector >= 0) { | |
616 | int old_cpu = old_vector >> 8; | |
617 | old_vector &= 0xff; | |
618 | per_cpu(vector_irq, old_cpu)[old_vector] = -1; | |
619 | } | |
620 | per_cpu(vector_irq, cpu)[vector] = irq; | |
621 | vector |= cpu << 8; | |
622 | IO_APIC_VECTOR(irq) = vector; | |
623 | return vector; | |
1da177e4 | 624 | } |
550f2299 | 625 | return -ENOSPC; |
04b9267b EB |
626 | } |
627 | ||
550f2299 | 628 | static int assign_irq_vector(int irq, cpumask_t mask) |
04b9267b EB |
629 | { |
630 | int vector; | |
631 | unsigned long flags; | |
0a1ad60d | 632 | |
04b9267b | 633 | spin_lock_irqsave(&vector_lock, flags); |
550f2299 | 634 | vector = __assign_irq_vector(irq, mask); |
26a3c49c | 635 | spin_unlock_irqrestore(&vector_lock, flags); |
0a1ad60d | 636 | return vector; |
1da177e4 LT |
637 | } |
638 | ||
639 | extern void (*interrupt[NR_IRQS])(void); | |
f29bd1ba IM |
640 | |
641 | static struct irq_chip ioapic_chip; | |
1da177e4 LT |
642 | |
643 | #define IOAPIC_AUTO -1 | |
644 | #define IOAPIC_EDGE 0 | |
645 | #define IOAPIC_LEVEL 1 | |
646 | ||
d1bef4ed | 647 | static void ioapic_register_intr(int irq, int vector, unsigned long trigger) |
1da177e4 | 648 | { |
6ebcc00e JB |
649 | if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) || |
650 | trigger == IOAPIC_LEVEL) | |
04b9267b | 651 | set_irq_chip_and_handler(irq, &ioapic_chip, |
f29bd1ba | 652 | handle_fasteoi_irq); |
6ebcc00e | 653 | else |
04b9267b | 654 | set_irq_chip_and_handler(irq, &ioapic_chip, |
f29bd1ba | 655 | handle_edge_irq); |
1da177e4 LT |
656 | } |
657 | ||
658 | static void __init setup_IO_APIC_irqs(void) | |
659 | { | |
660 | struct IO_APIC_route_entry entry; | |
661 | int apic, pin, idx, irq, first_notcon = 1, vector; | |
662 | unsigned long flags; | |
663 | ||
664 | apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n"); | |
665 | ||
666 | for (apic = 0; apic < nr_ioapics; apic++) { | |
667 | for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) { | |
668 | ||
669 | /* | |
670 | * add it to the IO-APIC irq-routing table: | |
671 | */ | |
672 | memset(&entry,0,sizeof(entry)); | |
673 | ||
674 | entry.delivery_mode = INT_DELIVERY_MODE; | |
675 | entry.dest_mode = INT_DEST_MODE; | |
676 | entry.mask = 0; /* enable IRQ */ | |
677 | entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS); | |
678 | ||
679 | idx = find_irq_entry(apic,pin,mp_INT); | |
680 | if (idx == -1) { | |
681 | if (first_notcon) { | |
682 | apic_printk(APIC_VERBOSE, KERN_DEBUG " IO-APIC (apicid-pin) %d-%d", mp_ioapics[apic].mpc_apicid, pin); | |
683 | first_notcon = 0; | |
684 | } else | |
685 | apic_printk(APIC_VERBOSE, ", %d-%d", mp_ioapics[apic].mpc_apicid, pin); | |
686 | continue; | |
687 | } | |
688 | ||
689 | entry.trigger = irq_trigger(idx); | |
690 | entry.polarity = irq_polarity(idx); | |
691 | ||
692 | if (irq_trigger(idx)) { | |
693 | entry.trigger = 1; | |
694 | entry.mask = 1; | |
695 | entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS); | |
696 | } | |
697 | ||
698 | irq = pin_2_irq(idx, apic, pin); | |
699 | add_pin_to_irq(irq, apic, pin); | |
700 | ||
701 | if (!apic && !IO_APIC_IRQ(irq)) | |
702 | continue; | |
703 | ||
704 | if (IO_APIC_IRQ(irq)) { | |
550f2299 EB |
705 | cpumask_t mask; |
706 | vector = assign_irq_vector(irq, TARGET_CPUS); | |
707 | if (vector < 0) | |
708 | continue; | |
709 | ||
710 | cpus_clear(mask); | |
711 | cpu_set(vector >> 8, mask); | |
712 | entry.dest.logical.logical_dest = cpu_mask_to_apicid(mask); | |
713 | entry.vector = vector & 0xff; | |
1da177e4 LT |
714 | |
715 | ioapic_register_intr(irq, vector, IOAPIC_AUTO); | |
716 | if (!apic && (irq < 16)) | |
717 | disable_8259A_irq(irq); | |
718 | } | |
eea0e11c AK |
719 | ioapic_write_entry(apic, pin, entry); |
720 | ||
1da177e4 | 721 | spin_lock_irqsave(&ioapic_lock, flags); |
54d5d424 | 722 | set_native_irq_info(irq, TARGET_CPUS); |
1da177e4 LT |
723 | spin_unlock_irqrestore(&ioapic_lock, flags); |
724 | } | |
725 | } | |
726 | ||
727 | if (!first_notcon) | |
728 | apic_printk(APIC_VERBOSE," not connected.\n"); | |
729 | } | |
730 | ||
731 | /* | |
732 | * Set up the 8259A-master output pin as broadcast to all | |
733 | * CPUs. | |
734 | */ | |
1008fddc | 735 | static void __init setup_ExtINT_IRQ0_pin(unsigned int apic, unsigned int pin, int vector) |
1da177e4 LT |
736 | { |
737 | struct IO_APIC_route_entry entry; | |
738 | unsigned long flags; | |
739 | ||
740 | memset(&entry,0,sizeof(entry)); | |
741 | ||
742 | disable_8259A_irq(0); | |
743 | ||
744 | /* mask LVT0 */ | |
11a8e778 | 745 | apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT); |
1da177e4 LT |
746 | |
747 | /* | |
748 | * We use logical delivery to get the timer IRQ | |
749 | * to the first CPU. | |
750 | */ | |
751 | entry.dest_mode = INT_DEST_MODE; | |
752 | entry.mask = 0; /* unmask IRQ now */ | |
753 | entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS); | |
754 | entry.delivery_mode = INT_DELIVERY_MODE; | |
755 | entry.polarity = 0; | |
756 | entry.trigger = 0; | |
757 | entry.vector = vector; | |
758 | ||
759 | /* | |
760 | * The timer IRQ doesn't have to know that behind the | |
761 | * scene we have a 8259A-master in AEOI mode ... | |
762 | */ | |
f29bd1ba | 763 | set_irq_chip_and_handler(0, &ioapic_chip, handle_edge_irq); |
1da177e4 LT |
764 | |
765 | /* | |
766 | * Add it to the IO-APIC irq-routing table: | |
767 | */ | |
768 | spin_lock_irqsave(&ioapic_lock, flags); | |
1008fddc EB |
769 | io_apic_write(apic, 0x11+2*pin, *(((int *)&entry)+1)); |
770 | io_apic_write(apic, 0x10+2*pin, *(((int *)&entry)+0)); | |
1da177e4 LT |
771 | spin_unlock_irqrestore(&ioapic_lock, flags); |
772 | ||
773 | enable_8259A_irq(0); | |
774 | } | |
775 | ||
776 | void __init UNEXPECTED_IO_APIC(void) | |
777 | { | |
778 | } | |
779 | ||
780 | void __apicdebuginit print_IO_APIC(void) | |
781 | { | |
782 | int apic, i; | |
783 | union IO_APIC_reg_00 reg_00; | |
784 | union IO_APIC_reg_01 reg_01; | |
785 | union IO_APIC_reg_02 reg_02; | |
786 | unsigned long flags; | |
787 | ||
788 | if (apic_verbosity == APIC_QUIET) | |
789 | return; | |
790 | ||
791 | printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries); | |
792 | for (i = 0; i < nr_ioapics; i++) | |
793 | printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n", | |
794 | mp_ioapics[i].mpc_apicid, nr_ioapic_registers[i]); | |
795 | ||
796 | /* | |
797 | * We are a bit conservative about what we expect. We have to | |
798 | * know about every hardware change ASAP. | |
799 | */ | |
800 | printk(KERN_INFO "testing the IO APIC.......................\n"); | |
801 | ||
802 | for (apic = 0; apic < nr_ioapics; apic++) { | |
803 | ||
804 | spin_lock_irqsave(&ioapic_lock, flags); | |
805 | reg_00.raw = io_apic_read(apic, 0); | |
806 | reg_01.raw = io_apic_read(apic, 1); | |
807 | if (reg_01.bits.version >= 0x10) | |
808 | reg_02.raw = io_apic_read(apic, 2); | |
809 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
810 | ||
811 | printk("\n"); | |
812 | printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].mpc_apicid); | |
813 | printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw); | |
814 | printk(KERN_DEBUG "....... : physical APIC id: %02X\n", reg_00.bits.ID); | |
815 | if (reg_00.bits.__reserved_1 || reg_00.bits.__reserved_2) | |
816 | UNEXPECTED_IO_APIC(); | |
817 | ||
818 | printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)®_01); | |
819 | printk(KERN_DEBUG "....... : max redirection entries: %04X\n", reg_01.bits.entries); | |
820 | if ( (reg_01.bits.entries != 0x0f) && /* older (Neptune) boards */ | |
821 | (reg_01.bits.entries != 0x17) && /* typical ISA+PCI boards */ | |
822 | (reg_01.bits.entries != 0x1b) && /* Compaq Proliant boards */ | |
823 | (reg_01.bits.entries != 0x1f) && /* dual Xeon boards */ | |
824 | (reg_01.bits.entries != 0x22) && /* bigger Xeon boards */ | |
825 | (reg_01.bits.entries != 0x2E) && | |
826 | (reg_01.bits.entries != 0x3F) && | |
827 | (reg_01.bits.entries != 0x03) | |
828 | ) | |
829 | UNEXPECTED_IO_APIC(); | |
830 | ||
831 | printk(KERN_DEBUG "....... : PRQ implemented: %X\n", reg_01.bits.PRQ); | |
832 | printk(KERN_DEBUG "....... : IO APIC version: %04X\n", reg_01.bits.version); | |
833 | if ( (reg_01.bits.version != 0x01) && /* 82489DX IO-APICs */ | |
834 | (reg_01.bits.version != 0x02) && /* 82801BA IO-APICs (ICH2) */ | |
835 | (reg_01.bits.version != 0x10) && /* oldest IO-APICs */ | |
836 | (reg_01.bits.version != 0x11) && /* Pentium/Pro IO-APICs */ | |
837 | (reg_01.bits.version != 0x13) && /* Xeon IO-APICs */ | |
838 | (reg_01.bits.version != 0x20) /* Intel P64H (82806 AA) */ | |
839 | ) | |
840 | UNEXPECTED_IO_APIC(); | |
841 | if (reg_01.bits.__reserved_1 || reg_01.bits.__reserved_2) | |
842 | UNEXPECTED_IO_APIC(); | |
843 | ||
844 | if (reg_01.bits.version >= 0x10) { | |
845 | printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw); | |
846 | printk(KERN_DEBUG "....... : arbitration: %02X\n", reg_02.bits.arbitration); | |
847 | if (reg_02.bits.__reserved_1 || reg_02.bits.__reserved_2) | |
848 | UNEXPECTED_IO_APIC(); | |
849 | } | |
850 | ||
851 | printk(KERN_DEBUG ".... IRQ redirection table:\n"); | |
852 | ||
853 | printk(KERN_DEBUG " NR Log Phy Mask Trig IRR Pol" | |
854 | " Stat Dest Deli Vect: \n"); | |
855 | ||
856 | for (i = 0; i <= reg_01.bits.entries; i++) { | |
857 | struct IO_APIC_route_entry entry; | |
858 | ||
eea0e11c | 859 | entry = ioapic_read_entry(apic, i); |
1da177e4 LT |
860 | |
861 | printk(KERN_DEBUG " %02x %03X %02X ", | |
862 | i, | |
863 | entry.dest.logical.logical_dest, | |
864 | entry.dest.physical.physical_dest | |
865 | ); | |
866 | ||
867 | printk("%1d %1d %1d %1d %1d %1d %1d %02X\n", | |
868 | entry.mask, | |
869 | entry.trigger, | |
870 | entry.irr, | |
871 | entry.polarity, | |
872 | entry.delivery_status, | |
873 | entry.dest_mode, | |
874 | entry.delivery_mode, | |
875 | entry.vector | |
876 | ); | |
877 | } | |
878 | } | |
1da177e4 LT |
879 | printk(KERN_DEBUG "IRQ to pin mappings:\n"); |
880 | for (i = 0; i < NR_IRQS; i++) { | |
881 | struct irq_pin_list *entry = irq_2_pin + i; | |
882 | if (entry->pin < 0) | |
883 | continue; | |
04b9267b | 884 | printk(KERN_DEBUG "IRQ%d ", i); |
1da177e4 LT |
885 | for (;;) { |
886 | printk("-> %d:%d", entry->apic, entry->pin); | |
887 | if (!entry->next) | |
888 | break; | |
889 | entry = irq_2_pin + entry->next; | |
890 | } | |
891 | printk("\n"); | |
892 | } | |
893 | ||
894 | printk(KERN_INFO ".................................... done.\n"); | |
895 | ||
896 | return; | |
897 | } | |
898 | ||
899 | #if 0 | |
900 | ||
901 | static __apicdebuginit void print_APIC_bitfield (int base) | |
902 | { | |
903 | unsigned int v; | |
904 | int i, j; | |
905 | ||
906 | if (apic_verbosity == APIC_QUIET) | |
907 | return; | |
908 | ||
909 | printk(KERN_DEBUG "0123456789abcdef0123456789abcdef\n" KERN_DEBUG); | |
910 | for (i = 0; i < 8; i++) { | |
911 | v = apic_read(base + i*0x10); | |
912 | for (j = 0; j < 32; j++) { | |
913 | if (v & (1<<j)) | |
914 | printk("1"); | |
915 | else | |
916 | printk("0"); | |
917 | } | |
918 | printk("\n"); | |
919 | } | |
920 | } | |
921 | ||
922 | void __apicdebuginit print_local_APIC(void * dummy) | |
923 | { | |
924 | unsigned int v, ver, maxlvt; | |
925 | ||
926 | if (apic_verbosity == APIC_QUIET) | |
927 | return; | |
928 | ||
929 | printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n", | |
930 | smp_processor_id(), hard_smp_processor_id()); | |
931 | v = apic_read(APIC_ID); | |
932 | printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v, GET_APIC_ID(v)); | |
933 | v = apic_read(APIC_LVR); | |
934 | printk(KERN_INFO "... APIC VERSION: %08x\n", v); | |
935 | ver = GET_APIC_VERSION(v); | |
936 | maxlvt = get_maxlvt(); | |
937 | ||
938 | v = apic_read(APIC_TASKPRI); | |
939 | printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK); | |
940 | ||
5a40b7c2 AK |
941 | v = apic_read(APIC_ARBPRI); |
942 | printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v, | |
943 | v & APIC_ARBPRI_MASK); | |
944 | v = apic_read(APIC_PROCPRI); | |
945 | printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v); | |
1da177e4 LT |
946 | |
947 | v = apic_read(APIC_EOI); | |
948 | printk(KERN_DEBUG "... APIC EOI: %08x\n", v); | |
949 | v = apic_read(APIC_RRR); | |
950 | printk(KERN_DEBUG "... APIC RRR: %08x\n", v); | |
951 | v = apic_read(APIC_LDR); | |
952 | printk(KERN_DEBUG "... APIC LDR: %08x\n", v); | |
953 | v = apic_read(APIC_DFR); | |
954 | printk(KERN_DEBUG "... APIC DFR: %08x\n", v); | |
955 | v = apic_read(APIC_SPIV); | |
956 | printk(KERN_DEBUG "... APIC SPIV: %08x\n", v); | |
957 | ||
958 | printk(KERN_DEBUG "... APIC ISR field:\n"); | |
959 | print_APIC_bitfield(APIC_ISR); | |
960 | printk(KERN_DEBUG "... APIC TMR field:\n"); | |
961 | print_APIC_bitfield(APIC_TMR); | |
962 | printk(KERN_DEBUG "... APIC IRR field:\n"); | |
963 | print_APIC_bitfield(APIC_IRR); | |
964 | ||
5a40b7c2 AK |
965 | v = apic_read(APIC_ESR); |
966 | printk(KERN_DEBUG "... APIC ESR: %08x\n", v); | |
1da177e4 LT |
967 | |
968 | v = apic_read(APIC_ICR); | |
969 | printk(KERN_DEBUG "... APIC ICR: %08x\n", v); | |
970 | v = apic_read(APIC_ICR2); | |
971 | printk(KERN_DEBUG "... APIC ICR2: %08x\n", v); | |
972 | ||
973 | v = apic_read(APIC_LVTT); | |
974 | printk(KERN_DEBUG "... APIC LVTT: %08x\n", v); | |
975 | ||
976 | if (maxlvt > 3) { /* PC is LVT#4. */ | |
977 | v = apic_read(APIC_LVTPC); | |
978 | printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v); | |
979 | } | |
980 | v = apic_read(APIC_LVT0); | |
981 | printk(KERN_DEBUG "... APIC LVT0: %08x\n", v); | |
982 | v = apic_read(APIC_LVT1); | |
983 | printk(KERN_DEBUG "... APIC LVT1: %08x\n", v); | |
984 | ||
985 | if (maxlvt > 2) { /* ERR is LVT#3. */ | |
986 | v = apic_read(APIC_LVTERR); | |
987 | printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v); | |
988 | } | |
989 | ||
990 | v = apic_read(APIC_TMICT); | |
991 | printk(KERN_DEBUG "... APIC TMICT: %08x\n", v); | |
992 | v = apic_read(APIC_TMCCT); | |
993 | printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v); | |
994 | v = apic_read(APIC_TDCR); | |
995 | printk(KERN_DEBUG "... APIC TDCR: %08x\n", v); | |
996 | printk("\n"); | |
997 | } | |
998 | ||
999 | void print_all_local_APICs (void) | |
1000 | { | |
1001 | on_each_cpu(print_local_APIC, NULL, 1, 1); | |
1002 | } | |
1003 | ||
1004 | void __apicdebuginit print_PIC(void) | |
1005 | { | |
1da177e4 LT |
1006 | unsigned int v; |
1007 | unsigned long flags; | |
1008 | ||
1009 | if (apic_verbosity == APIC_QUIET) | |
1010 | return; | |
1011 | ||
1012 | printk(KERN_DEBUG "\nprinting PIC contents\n"); | |
1013 | ||
1014 | spin_lock_irqsave(&i8259A_lock, flags); | |
1015 | ||
1016 | v = inb(0xa1) << 8 | inb(0x21); | |
1017 | printk(KERN_DEBUG "... PIC IMR: %04x\n", v); | |
1018 | ||
1019 | v = inb(0xa0) << 8 | inb(0x20); | |
1020 | printk(KERN_DEBUG "... PIC IRR: %04x\n", v); | |
1021 | ||
1022 | outb(0x0b,0xa0); | |
1023 | outb(0x0b,0x20); | |
1024 | v = inb(0xa0) << 8 | inb(0x20); | |
1025 | outb(0x0a,0xa0); | |
1026 | outb(0x0a,0x20); | |
1027 | ||
1028 | spin_unlock_irqrestore(&i8259A_lock, flags); | |
1029 | ||
1030 | printk(KERN_DEBUG "... PIC ISR: %04x\n", v); | |
1031 | ||
1032 | v = inb(0x4d1) << 8 | inb(0x4d0); | |
1033 | printk(KERN_DEBUG "... PIC ELCR: %04x\n", v); | |
1034 | } | |
1035 | ||
1036 | #endif /* 0 */ | |
1037 | ||
1038 | static void __init enable_IO_APIC(void) | |
1039 | { | |
1040 | union IO_APIC_reg_01 reg_01; | |
1008fddc EB |
1041 | int i8259_apic, i8259_pin; |
1042 | int i, apic; | |
1da177e4 LT |
1043 | unsigned long flags; |
1044 | ||
1045 | for (i = 0; i < PIN_MAP_SIZE; i++) { | |
1046 | irq_2_pin[i].pin = -1; | |
1047 | irq_2_pin[i].next = 0; | |
1048 | } | |
1da177e4 LT |
1049 | |
1050 | /* | |
1051 | * The number of IO-APIC IRQ registers (== #pins): | |
1052 | */ | |
1008fddc | 1053 | for (apic = 0; apic < nr_ioapics; apic++) { |
1da177e4 | 1054 | spin_lock_irqsave(&ioapic_lock, flags); |
1008fddc | 1055 | reg_01.raw = io_apic_read(apic, 1); |
1da177e4 | 1056 | spin_unlock_irqrestore(&ioapic_lock, flags); |
1008fddc EB |
1057 | nr_ioapic_registers[apic] = reg_01.bits.entries+1; |
1058 | } | |
1059 | for(apic = 0; apic < nr_ioapics; apic++) { | |
1060 | int pin; | |
1061 | /* See if any of the pins is in ExtINT mode */ | |
1062 | for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) { | |
1063 | struct IO_APIC_route_entry entry; | |
eea0e11c | 1064 | entry = ioapic_read_entry(apic, pin); |
1008fddc EB |
1065 | |
1066 | /* If the interrupt line is enabled and in ExtInt mode | |
1067 | * I have found the pin where the i8259 is connected. | |
1068 | */ | |
1069 | if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) { | |
1070 | ioapic_i8259.apic = apic; | |
1071 | ioapic_i8259.pin = pin; | |
1072 | goto found_i8259; | |
1073 | } | |
1074 | } | |
1075 | } | |
1076 | found_i8259: | |
1077 | /* Look to see what if the MP table has reported the ExtINT */ | |
1078 | i8259_pin = find_isa_irq_pin(0, mp_ExtINT); | |
1079 | i8259_apic = find_isa_irq_apic(0, mp_ExtINT); | |
1080 | /* Trust the MP table if nothing is setup in the hardware */ | |
1081 | if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) { | |
1082 | printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n"); | |
1083 | ioapic_i8259.pin = i8259_pin; | |
1084 | ioapic_i8259.apic = i8259_apic; | |
1085 | } | |
1086 | /* Complain if the MP table and the hardware disagree */ | |
1087 | if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) && | |
1088 | (i8259_pin >= 0) && (ioapic_i8259.pin >= 0)) | |
1089 | { | |
1090 | printk(KERN_WARNING "ExtINT in hardware and MP table differ\n"); | |
1da177e4 LT |
1091 | } |
1092 | ||
1093 | /* | |
1094 | * Do not trust the IO-APIC being empty at bootup | |
1095 | */ | |
1096 | clear_IO_APIC(); | |
1097 | } | |
1098 | ||
1099 | /* | |
1100 | * Not an __init, needed by the reboot code | |
1101 | */ | |
1102 | void disable_IO_APIC(void) | |
1103 | { | |
1104 | /* | |
1105 | * Clear the IO-APIC before rebooting: | |
1106 | */ | |
1107 | clear_IO_APIC(); | |
1108 | ||
208fb931 | 1109 | /* |
0b968d23 | 1110 | * If the i8259 is routed through an IOAPIC |
208fb931 | 1111 | * Put that IOAPIC in virtual wire mode |
0b968d23 | 1112 | * so legacy interrupts can be delivered. |
208fb931 | 1113 | */ |
1008fddc | 1114 | if (ioapic_i8259.pin != -1) { |
208fb931 | 1115 | struct IO_APIC_route_entry entry; |
208fb931 EB |
1116 | |
1117 | memset(&entry, 0, sizeof(entry)); | |
1118 | entry.mask = 0; /* Enabled */ | |
1119 | entry.trigger = 0; /* Edge */ | |
1120 | entry.irr = 0; | |
1121 | entry.polarity = 0; /* High */ | |
1122 | entry.delivery_status = 0; | |
1123 | entry.dest_mode = 0; /* Physical */ | |
1008fddc | 1124 | entry.delivery_mode = dest_ExtINT; /* ExtInt */ |
208fb931 | 1125 | entry.vector = 0; |
af5b9804 VG |
1126 | entry.dest.physical.physical_dest = |
1127 | GET_APIC_ID(apic_read(APIC_ID)); | |
208fb931 | 1128 | |
208fb931 EB |
1129 | /* |
1130 | * Add it to the IO-APIC irq-routing table: | |
1131 | */ | |
eea0e11c | 1132 | ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry); |
208fb931 EB |
1133 | } |
1134 | ||
1008fddc | 1135 | disconnect_bsp_APIC(ioapic_i8259.pin != -1); |
1da177e4 LT |
1136 | } |
1137 | ||
1da177e4 LT |
1138 | /* |
1139 | * There is a nasty bug in some older SMP boards, their mptable lies | |
1140 | * about the timer IRQ. We do the following to work around the situation: | |
1141 | * | |
1142 | * - timer IRQ defaults to IO-APIC IRQ | |
1143 | * - if this function detects that timer IRQs are defunct, then we fall | |
1144 | * back to ISA timer IRQs | |
1145 | */ | |
1146 | static int __init timer_irq_works(void) | |
1147 | { | |
1148 | unsigned long t1 = jiffies; | |
1149 | ||
1150 | local_irq_enable(); | |
1151 | /* Let ten ticks pass... */ | |
1152 | mdelay((10 * 1000) / HZ); | |
1153 | ||
1154 | /* | |
1155 | * Expect a few ticks at least, to be sure some possible | |
1156 | * glue logic does not lock up after one or two first | |
1157 | * ticks in a non-ExtINT mode. Also the local APIC | |
1158 | * might have cached one ExtINT interrupt. Finally, at | |
1159 | * least one tick may be lost due to delays. | |
1160 | */ | |
1161 | ||
1162 | /* jiffies wrap? */ | |
1163 | if (jiffies - t1 > 4) | |
1164 | return 1; | |
1165 | return 0; | |
1166 | } | |
1167 | ||
1168 | /* | |
1169 | * In the SMP+IOAPIC case it might happen that there are an unspecified | |
1170 | * number of pending IRQ events unhandled. These cases are very rare, | |
1171 | * so we 'resend' these IRQs via IPIs, to the same CPU. It's much | |
1172 | * better to do it this way as thus we do not have to be aware of | |
1173 | * 'pending' interrupts in the IRQ path, except at this point. | |
1174 | */ | |
1175 | /* | |
1176 | * Edge triggered needs to resend any interrupt | |
1177 | * that was delayed but this is now handled in the device | |
1178 | * independent code. | |
1179 | */ | |
1180 | ||
1181 | /* | |
1182 | * Starting up a edge-triggered IO-APIC interrupt is | |
1183 | * nasty - we need to make sure that we get the edge. | |
1184 | * If it is already asserted for some reason, we need | |
1185 | * return 1 to indicate that is was pending. | |
1186 | * | |
1187 | * This is not complete - we should be able to fake | |
1188 | * an edge even if it isn't on the 8259A... | |
1189 | */ | |
1190 | ||
f29bd1ba | 1191 | static unsigned int startup_ioapic_irq(unsigned int irq) |
1da177e4 LT |
1192 | { |
1193 | int was_pending = 0; | |
1194 | unsigned long flags; | |
1195 | ||
1196 | spin_lock_irqsave(&ioapic_lock, flags); | |
1197 | if (irq < 16) { | |
1198 | disable_8259A_irq(irq); | |
1199 | if (i8259A_irq_pending(irq)) | |
1200 | was_pending = 1; | |
1201 | } | |
1202 | __unmask_IO_APIC_irq(irq); | |
1203 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
1204 | ||
1205 | return was_pending; | |
1206 | } | |
1207 | ||
04b9267b | 1208 | static int ioapic_retrigger_irq(unsigned int irq) |
c0ad90a3 | 1209 | { |
550f2299 EB |
1210 | cpumask_t mask; |
1211 | unsigned vector; | |
1212 | ||
1213 | vector = irq_vector[irq]; | |
1214 | cpus_clear(mask); | |
1215 | cpu_set(vector >> 8, mask); | |
1216 | ||
1217 | send_IPI_mask(mask, vector & 0xff); | |
c0ad90a3 IM |
1218 | |
1219 | return 1; | |
1220 | } | |
1221 | ||
1da177e4 LT |
1222 | /* |
1223 | * Level and edge triggered IO-APIC interrupts need different handling, | |
1224 | * so we use two separate IRQ descriptors. Edge triggered IRQs can be | |
1225 | * handled with the level-triggered descriptor, but that one has slightly | |
1226 | * more overhead. Level-triggered interrupts cannot be handled with the | |
1227 | * edge-triggered handler, without risking IRQ storms and other ugly | |
1228 | * races. | |
1229 | */ | |
1230 | ||
0be6652f EB |
1231 | static void ack_apic_edge(unsigned int irq) |
1232 | { | |
1233 | move_native_irq(irq); | |
1234 | ack_APIC_irq(); | |
1235 | } | |
1236 | ||
1237 | static void ack_apic_level(unsigned int irq) | |
1238 | { | |
1239 | int do_unmask_irq = 0; | |
1240 | ||
1241 | #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE) | |
1242 | /* If we are moving the irq we need to mask it */ | |
1243 | if (unlikely(irq_desc[irq].status & IRQ_MOVE_PENDING)) { | |
1244 | do_unmask_irq = 1; | |
1245 | mask_IO_APIC_irq(irq); | |
1246 | } | |
1247 | #endif | |
1248 | ||
1249 | /* | |
1250 | * We must acknowledge the irq before we move it or the acknowledge will | |
1251 | * not propogate properly. | |
1252 | */ | |
1253 | ack_APIC_irq(); | |
1254 | ||
1255 | /* Now we can move and renable the irq */ | |
1256 | move_masked_irq(irq); | |
1257 | if (unlikely(do_unmask_irq)) | |
1258 | unmask_IO_APIC_irq(irq); | |
1259 | } | |
1260 | ||
f29bd1ba IM |
1261 | static struct irq_chip ioapic_chip __read_mostly = { |
1262 | .name = "IO-APIC", | |
04b9267b EB |
1263 | .startup = startup_ioapic_irq, |
1264 | .mask = mask_IO_APIC_irq, | |
1265 | .unmask = unmask_IO_APIC_irq, | |
0be6652f EB |
1266 | .ack = ack_apic_edge, |
1267 | .eoi = ack_apic_level, | |
54d5d424 | 1268 | #ifdef CONFIG_SMP |
04b9267b | 1269 | .set_affinity = set_ioapic_affinity_irq, |
54d5d424 | 1270 | #endif |
04b9267b | 1271 | .retrigger = ioapic_retrigger_irq, |
1da177e4 LT |
1272 | }; |
1273 | ||
1274 | static inline void init_IO_APIC_traps(void) | |
1275 | { | |
1276 | int irq; | |
1277 | ||
1278 | /* | |
1279 | * NOTE! The local APIC isn't very good at handling | |
1280 | * multiple interrupts at the same interrupt level. | |
1281 | * As the interrupt level is determined by taking the | |
1282 | * vector number and shifting that right by 4, we | |
1283 | * want to spread these out a bit so that they don't | |
1284 | * all fall in the same interrupt level. | |
1285 | * | |
1286 | * Also, we've got to be careful not to trash gate | |
1287 | * 0x80, because int 0x80 is hm, kind of importantish. ;) | |
1288 | */ | |
1289 | for (irq = 0; irq < NR_IRQS ; irq++) { | |
1290 | int tmp = irq; | |
1da177e4 LT |
1291 | if (IO_APIC_IRQ(tmp) && !IO_APIC_VECTOR(tmp)) { |
1292 | /* | |
1293 | * Hmm.. We don't have an entry for this, | |
1294 | * so default to an old-fashioned 8259 | |
1295 | * interrupt if we can.. | |
1296 | */ | |
1297 | if (irq < 16) | |
1298 | make_8259A_irq(irq); | |
1299 | else | |
1300 | /* Strange. Oh, well.. */ | |
f29bd1ba | 1301 | irq_desc[irq].chip = &no_irq_chip; |
1da177e4 LT |
1302 | } |
1303 | } | |
1304 | } | |
1305 | ||
1306 | static void enable_lapic_irq (unsigned int irq) | |
1307 | { | |
1308 | unsigned long v; | |
1309 | ||
1310 | v = apic_read(APIC_LVT0); | |
11a8e778 | 1311 | apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED); |
1da177e4 LT |
1312 | } |
1313 | ||
1314 | static void disable_lapic_irq (unsigned int irq) | |
1315 | { | |
1316 | unsigned long v; | |
1317 | ||
1318 | v = apic_read(APIC_LVT0); | |
11a8e778 | 1319 | apic_write(APIC_LVT0, v | APIC_LVT_MASKED); |
1da177e4 LT |
1320 | } |
1321 | ||
1322 | static void ack_lapic_irq (unsigned int irq) | |
1323 | { | |
1324 | ack_APIC_irq(); | |
1325 | } | |
1326 | ||
1327 | static void end_lapic_irq (unsigned int i) { /* nothing */ } | |
1328 | ||
6c231b7b | 1329 | static struct hw_interrupt_type lapic_irq_type __read_mostly = { |
1da177e4 LT |
1330 | .typename = "local-APIC-edge", |
1331 | .startup = NULL, /* startup_irq() not used for IRQ0 */ | |
1332 | .shutdown = NULL, /* shutdown_irq() not used for IRQ0 */ | |
1333 | .enable = enable_lapic_irq, | |
1334 | .disable = disable_lapic_irq, | |
1335 | .ack = ack_lapic_irq, | |
1336 | .end = end_lapic_irq, | |
1337 | }; | |
1338 | ||
1339 | static void setup_nmi (void) | |
1340 | { | |
1341 | /* | |
1342 | * Dirty trick to enable the NMI watchdog ... | |
1343 | * We put the 8259A master into AEOI mode and | |
1344 | * unmask on all local APICs LVT0 as NMI. | |
1345 | * | |
1346 | * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire') | |
1347 | * is from Maciej W. Rozycki - so we do not have to EOI from | |
1348 | * the NMI handler or the timer interrupt. | |
1349 | */ | |
1350 | printk(KERN_INFO "activating NMI Watchdog ..."); | |
1351 | ||
1352 | enable_NMI_through_LVT0(NULL); | |
1353 | ||
1354 | printk(" done.\n"); | |
1355 | } | |
1356 | ||
1357 | /* | |
1358 | * This looks a bit hackish but it's about the only one way of sending | |
1359 | * a few INTA cycles to 8259As and any associated glue logic. ICR does | |
1360 | * not support the ExtINT mode, unfortunately. We need to send these | |
1361 | * cycles as some i82489DX-based boards have glue logic that keeps the | |
1362 | * 8259A interrupt line asserted until INTA. --macro | |
1363 | */ | |
1364 | static inline void unlock_ExtINT_logic(void) | |
1365 | { | |
1008fddc | 1366 | int apic, pin, i; |
1da177e4 LT |
1367 | struct IO_APIC_route_entry entry0, entry1; |
1368 | unsigned char save_control, save_freq_select; | |
1369 | unsigned long flags; | |
1370 | ||
1008fddc EB |
1371 | pin = find_isa_irq_pin(8, mp_INT); |
1372 | apic = find_isa_irq_apic(8, mp_INT); | |
1da177e4 LT |
1373 | if (pin == -1) |
1374 | return; | |
1375 | ||
1376 | spin_lock_irqsave(&ioapic_lock, flags); | |
1008fddc EB |
1377 | *(((int *)&entry0) + 1) = io_apic_read(apic, 0x11 + 2 * pin); |
1378 | *(((int *)&entry0) + 0) = io_apic_read(apic, 0x10 + 2 * pin); | |
1da177e4 | 1379 | spin_unlock_irqrestore(&ioapic_lock, flags); |
1008fddc | 1380 | clear_IO_APIC_pin(apic, pin); |
1da177e4 LT |
1381 | |
1382 | memset(&entry1, 0, sizeof(entry1)); | |
1383 | ||
1384 | entry1.dest_mode = 0; /* physical delivery */ | |
1385 | entry1.mask = 0; /* unmask IRQ now */ | |
1386 | entry1.dest.physical.physical_dest = hard_smp_processor_id(); | |
1387 | entry1.delivery_mode = dest_ExtINT; | |
1388 | entry1.polarity = entry0.polarity; | |
1389 | entry1.trigger = 0; | |
1390 | entry1.vector = 0; | |
1391 | ||
1392 | spin_lock_irqsave(&ioapic_lock, flags); | |
1008fddc EB |
1393 | io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry1) + 1)); |
1394 | io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry1) + 0)); | |
1da177e4 LT |
1395 | spin_unlock_irqrestore(&ioapic_lock, flags); |
1396 | ||
1397 | save_control = CMOS_READ(RTC_CONTROL); | |
1398 | save_freq_select = CMOS_READ(RTC_FREQ_SELECT); | |
1399 | CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6, | |
1400 | RTC_FREQ_SELECT); | |
1401 | CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL); | |
1402 | ||
1403 | i = 100; | |
1404 | while (i-- > 0) { | |
1405 | mdelay(10); | |
1406 | if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF) | |
1407 | i -= 10; | |
1408 | } | |
1409 | ||
1410 | CMOS_WRITE(save_control, RTC_CONTROL); | |
1411 | CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT); | |
1008fddc | 1412 | clear_IO_APIC_pin(apic, pin); |
1da177e4 LT |
1413 | |
1414 | spin_lock_irqsave(&ioapic_lock, flags); | |
1008fddc EB |
1415 | io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry0) + 1)); |
1416 | io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry0) + 0)); | |
1da177e4 LT |
1417 | spin_unlock_irqrestore(&ioapic_lock, flags); |
1418 | } | |
1419 | ||
1420 | /* | |
1421 | * This code may look a bit paranoid, but it's supposed to cooperate with | |
1422 | * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ | |
1423 | * is so screwy. Thanks to Brian Perkins for testing/hacking this beast | |
1424 | * fanatically on his truly buggy board. | |
ab9b32ee AK |
1425 | * |
1426 | * FIXME: really need to revamp this for modern platforms only. | |
1da177e4 LT |
1427 | */ |
1428 | static inline void check_timer(void) | |
1429 | { | |
1008fddc | 1430 | int apic1, pin1, apic2, pin2; |
1da177e4 LT |
1431 | int vector; |
1432 | ||
1433 | /* | |
1434 | * get/set the timer IRQ vector: | |
1435 | */ | |
1436 | disable_8259A_irq(0); | |
550f2299 | 1437 | vector = assign_irq_vector(0, TARGET_CPUS); |
1da177e4 LT |
1438 | |
1439 | /* | |
1440 | * Subtle, code in do_timer_interrupt() expects an AEOI | |
1441 | * mode for the 8259A whenever interrupts are routed | |
1442 | * through I/O APICs. Also IRQ0 has to be enabled in | |
1443 | * the 8259A which implies the virtual wire has to be | |
1444 | * disabled in the local APIC. | |
1445 | */ | |
11a8e778 | 1446 | apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT); |
1da177e4 | 1447 | init_8259A(1); |
ab9b32ee AK |
1448 | if (timer_over_8254 > 0) |
1449 | enable_8259A_irq(0); | |
1da177e4 | 1450 | |
1008fddc EB |
1451 | pin1 = find_isa_irq_pin(0, mp_INT); |
1452 | apic1 = find_isa_irq_apic(0, mp_INT); | |
1453 | pin2 = ioapic_i8259.pin; | |
1454 | apic2 = ioapic_i8259.apic; | |
1da177e4 | 1455 | |
1008fddc EB |
1456 | apic_printk(APIC_VERBOSE,KERN_INFO "..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n", |
1457 | vector, apic1, pin1, apic2, pin2); | |
1da177e4 LT |
1458 | |
1459 | if (pin1 != -1) { | |
1460 | /* | |
1461 | * Ok, does IRQ0 through the IOAPIC work? | |
1462 | */ | |
1463 | unmask_IO_APIC_irq(0); | |
14d98cad | 1464 | if (!no_timer_check && timer_irq_works()) { |
1da177e4 LT |
1465 | nmi_watchdog_default(); |
1466 | if (nmi_watchdog == NMI_IO_APIC) { | |
1467 | disable_8259A_irq(0); | |
1468 | setup_nmi(); | |
1469 | enable_8259A_irq(0); | |
1da177e4 | 1470 | } |
66759a01 CE |
1471 | if (disable_timer_pin_1 > 0) |
1472 | clear_IO_APIC_pin(0, pin1); | |
1da177e4 LT |
1473 | return; |
1474 | } | |
1008fddc EB |
1475 | clear_IO_APIC_pin(apic1, pin1); |
1476 | apic_printk(APIC_QUIET,KERN_ERR "..MP-BIOS bug: 8254 timer not " | |
1477 | "connected to IO-APIC\n"); | |
1da177e4 LT |
1478 | } |
1479 | ||
1008fddc EB |
1480 | apic_printk(APIC_VERBOSE,KERN_INFO "...trying to set up timer (IRQ0) " |
1481 | "through the 8259A ... "); | |
1da177e4 | 1482 | if (pin2 != -1) { |
1008fddc EB |
1483 | apic_printk(APIC_VERBOSE,"\n..... (found apic %d pin %d) ...", |
1484 | apic2, pin2); | |
1da177e4 LT |
1485 | /* |
1486 | * legacy devices should be connected to IO APIC #0 | |
1487 | */ | |
1008fddc | 1488 | setup_ExtINT_IRQ0_pin(apic2, pin2, vector); |
1da177e4 | 1489 | if (timer_irq_works()) { |
5b922cd4 | 1490 | apic_printk(APIC_VERBOSE," works.\n"); |
1da177e4 LT |
1491 | nmi_watchdog_default(); |
1492 | if (nmi_watchdog == NMI_IO_APIC) { | |
1493 | setup_nmi(); | |
1da177e4 LT |
1494 | } |
1495 | return; | |
1496 | } | |
1497 | /* | |
1498 | * Cleanup, just in case ... | |
1499 | */ | |
1008fddc | 1500 | clear_IO_APIC_pin(apic2, pin2); |
1da177e4 | 1501 | } |
5b922cd4 | 1502 | apic_printk(APIC_VERBOSE," failed.\n"); |
1da177e4 | 1503 | |
1f992153 | 1504 | if (nmi_watchdog == NMI_IO_APIC) { |
1da177e4 LT |
1505 | printk(KERN_WARNING "timer doesn't work through the IO-APIC - disabling NMI Watchdog!\n"); |
1506 | nmi_watchdog = 0; | |
1507 | } | |
1508 | ||
1509 | apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as Virtual Wire IRQ..."); | |
1510 | ||
1511 | disable_8259A_irq(0); | |
d1bef4ed | 1512 | irq_desc[0].chip = &lapic_irq_type; |
11a8e778 | 1513 | apic_write(APIC_LVT0, APIC_DM_FIXED | vector); /* Fixed mode */ |
1da177e4 LT |
1514 | enable_8259A_irq(0); |
1515 | ||
1516 | if (timer_irq_works()) { | |
5b922cd4 | 1517 | apic_printk(APIC_VERBOSE," works.\n"); |
1da177e4 LT |
1518 | return; |
1519 | } | |
11a8e778 | 1520 | apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | vector); |
1da177e4 LT |
1521 | apic_printk(APIC_VERBOSE," failed.\n"); |
1522 | ||
1523 | apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as ExtINT IRQ..."); | |
1524 | ||
1525 | init_8259A(0); | |
1526 | make_8259A_irq(0); | |
11a8e778 | 1527 | apic_write(APIC_LVT0, APIC_DM_EXTINT); |
1da177e4 LT |
1528 | |
1529 | unlock_ExtINT_logic(); | |
1530 | ||
1531 | if (timer_irq_works()) { | |
1532 | apic_printk(APIC_VERBOSE," works.\n"); | |
1533 | return; | |
1534 | } | |
1535 | apic_printk(APIC_VERBOSE," failed :(.\n"); | |
1536 | panic("IO-APIC + timer doesn't work! Try using the 'noapic' kernel parameter\n"); | |
1537 | } | |
1538 | ||
14d98cad AK |
1539 | static int __init notimercheck(char *s) |
1540 | { | |
1541 | no_timer_check = 1; | |
1542 | return 1; | |
1543 | } | |
1544 | __setup("no_timer_check", notimercheck); | |
1545 | ||
1da177e4 LT |
1546 | /* |
1547 | * | |
1548 | * IRQ's that are handled by the PIC in the MPS IOAPIC case. | |
1549 | * - IRQ2 is the cascade IRQ, and cannot be a io-apic IRQ. | |
1550 | * Linux doesn't really care, as it's not actually used | |
1551 | * for any interrupt handling anyway. | |
1552 | */ | |
1553 | #define PIC_IRQS (1<<2) | |
1554 | ||
1555 | void __init setup_IO_APIC(void) | |
1556 | { | |
1557 | enable_IO_APIC(); | |
1558 | ||
1559 | if (acpi_ioapic) | |
1560 | io_apic_irqs = ~0; /* all IRQs go through IOAPIC */ | |
1561 | else | |
1562 | io_apic_irqs = ~PIC_IRQS; | |
1563 | ||
1564 | apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n"); | |
1565 | ||
1da177e4 LT |
1566 | sync_Arb_IDs(); |
1567 | setup_IO_APIC_irqs(); | |
1568 | init_IO_APIC_traps(); | |
1569 | check_timer(); | |
1570 | if (!acpi_ioapic) | |
1571 | print_IO_APIC(); | |
1572 | } | |
1573 | ||
1574 | struct sysfs_ioapic_data { | |
1575 | struct sys_device dev; | |
1576 | struct IO_APIC_route_entry entry[0]; | |
1577 | }; | |
1578 | static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS]; | |
1579 | ||
0b9c33a7 | 1580 | static int ioapic_suspend(struct sys_device *dev, pm_message_t state) |
1da177e4 LT |
1581 | { |
1582 | struct IO_APIC_route_entry *entry; | |
1583 | struct sysfs_ioapic_data *data; | |
1da177e4 LT |
1584 | int i; |
1585 | ||
1586 | data = container_of(dev, struct sysfs_ioapic_data, dev); | |
1587 | entry = data->entry; | |
eea0e11c AK |
1588 | for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ ) |
1589 | *entry = ioapic_read_entry(dev->id, i); | |
1da177e4 LT |
1590 | |
1591 | return 0; | |
1592 | } | |
1593 | ||
1594 | static int ioapic_resume(struct sys_device *dev) | |
1595 | { | |
1596 | struct IO_APIC_route_entry *entry; | |
1597 | struct sysfs_ioapic_data *data; | |
1598 | unsigned long flags; | |
1599 | union IO_APIC_reg_00 reg_00; | |
1600 | int i; | |
1601 | ||
1602 | data = container_of(dev, struct sysfs_ioapic_data, dev); | |
1603 | entry = data->entry; | |
1604 | ||
1605 | spin_lock_irqsave(&ioapic_lock, flags); | |
1606 | reg_00.raw = io_apic_read(dev->id, 0); | |
1607 | if (reg_00.bits.ID != mp_ioapics[dev->id].mpc_apicid) { | |
1608 | reg_00.bits.ID = mp_ioapics[dev->id].mpc_apicid; | |
1609 | io_apic_write(dev->id, 0, reg_00.raw); | |
1610 | } | |
1da177e4 | 1611 | spin_unlock_irqrestore(&ioapic_lock, flags); |
eea0e11c AK |
1612 | for (i = 0; i < nr_ioapic_registers[dev->id]; i++) |
1613 | ioapic_write_entry(dev->id, i, entry[i]); | |
1da177e4 LT |
1614 | |
1615 | return 0; | |
1616 | } | |
1617 | ||
1618 | static struct sysdev_class ioapic_sysdev_class = { | |
1619 | set_kset_name("ioapic"), | |
1620 | .suspend = ioapic_suspend, | |
1621 | .resume = ioapic_resume, | |
1622 | }; | |
1623 | ||
1624 | static int __init ioapic_init_sysfs(void) | |
1625 | { | |
1626 | struct sys_device * dev; | |
1627 | int i, size, error = 0; | |
1628 | ||
1629 | error = sysdev_class_register(&ioapic_sysdev_class); | |
1630 | if (error) | |
1631 | return error; | |
1632 | ||
1633 | for (i = 0; i < nr_ioapics; i++ ) { | |
1634 | size = sizeof(struct sys_device) + nr_ioapic_registers[i] | |
1635 | * sizeof(struct IO_APIC_route_entry); | |
1636 | mp_ioapic_data[i] = kmalloc(size, GFP_KERNEL); | |
1637 | if (!mp_ioapic_data[i]) { | |
1638 | printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i); | |
1639 | continue; | |
1640 | } | |
1641 | memset(mp_ioapic_data[i], 0, size); | |
1642 | dev = &mp_ioapic_data[i]->dev; | |
1643 | dev->id = i; | |
1644 | dev->cls = &ioapic_sysdev_class; | |
1645 | error = sysdev_register(dev); | |
1646 | if (error) { | |
1647 | kfree(mp_ioapic_data[i]); | |
1648 | mp_ioapic_data[i] = NULL; | |
1649 | printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i); | |
1650 | continue; | |
1651 | } | |
1652 | } | |
1653 | ||
1654 | return 0; | |
1655 | } | |
1656 | ||
1657 | device_initcall(ioapic_init_sysfs); | |
1658 | ||
c4fa0bbf | 1659 | /* |
04b9267b | 1660 | * Dynamic irq allocate and deallocation |
c4fa0bbf EB |
1661 | */ |
1662 | int create_irq(void) | |
1663 | { | |
04b9267b EB |
1664 | /* Allocate an unused irq */ |
1665 | int irq; | |
1666 | int new; | |
1667 | int vector = 0; | |
c4fa0bbf | 1668 | unsigned long flags; |
c4fa0bbf | 1669 | |
04b9267b EB |
1670 | irq = -ENOSPC; |
1671 | spin_lock_irqsave(&vector_lock, flags); | |
1672 | for (new = (NR_IRQS - 1); new >= 0; new--) { | |
1673 | if (platform_legacy_irq(new)) | |
1674 | continue; | |
1675 | if (irq_vector[new] != 0) | |
1676 | continue; | |
550f2299 | 1677 | vector = __assign_irq_vector(new, TARGET_CPUS); |
04b9267b EB |
1678 | if (likely(vector > 0)) |
1679 | irq = new; | |
1680 | break; | |
1681 | } | |
1682 | spin_unlock_irqrestore(&vector_lock, flags); | |
c4fa0bbf | 1683 | |
04b9267b | 1684 | if (irq >= 0) { |
c4fa0bbf EB |
1685 | dynamic_irq_init(irq); |
1686 | } | |
1687 | return irq; | |
1688 | } | |
1689 | ||
1690 | void destroy_irq(unsigned int irq) | |
1691 | { | |
1692 | unsigned long flags; | |
c4fa0bbf EB |
1693 | |
1694 | dynamic_irq_cleanup(irq); | |
1695 | ||
1696 | spin_lock_irqsave(&vector_lock, flags); | |
c4fa0bbf EB |
1697 | irq_vector[irq] = 0; |
1698 | spin_unlock_irqrestore(&vector_lock, flags); | |
1699 | } | |
c4fa0bbf | 1700 | |
589e367f EB |
1701 | /* |
1702 | * MSI mesage composition | |
1703 | */ | |
1704 | #ifdef CONFIG_PCI_MSI | |
3b7d1921 | 1705 | static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg) |
589e367f | 1706 | { |
589e367f EB |
1707 | int vector; |
1708 | unsigned dest; | |
1709 | ||
550f2299 | 1710 | vector = assign_irq_vector(irq, TARGET_CPUS); |
589e367f EB |
1711 | if (vector >= 0) { |
1712 | cpumask_t tmp; | |
1713 | ||
1714 | cpus_clear(tmp); | |
550f2299 | 1715 | cpu_set(vector >> 8, tmp); |
589e367f EB |
1716 | dest = cpu_mask_to_apicid(tmp); |
1717 | ||
1718 | msg->address_hi = MSI_ADDR_BASE_HI; | |
1719 | msg->address_lo = | |
1720 | MSI_ADDR_BASE_LO | | |
1721 | ((INT_DEST_MODE == 0) ? | |
1722 | MSI_ADDR_DEST_MODE_PHYSICAL: | |
1723 | MSI_ADDR_DEST_MODE_LOGICAL) | | |
1724 | ((INT_DELIVERY_MODE != dest_LowestPrio) ? | |
1725 | MSI_ADDR_REDIRECTION_CPU: | |
1726 | MSI_ADDR_REDIRECTION_LOWPRI) | | |
1727 | MSI_ADDR_DEST_ID(dest); | |
1728 | ||
1729 | msg->data = | |
1730 | MSI_DATA_TRIGGER_EDGE | | |
1731 | MSI_DATA_LEVEL_ASSERT | | |
1732 | ((INT_DELIVERY_MODE != dest_LowestPrio) ? | |
1733 | MSI_DATA_DELIVERY_FIXED: | |
1734 | MSI_DATA_DELIVERY_LOWPRI) | | |
1735 | MSI_DATA_VECTOR(vector); | |
1736 | } | |
1737 | return vector; | |
1738 | } | |
1739 | ||
3b7d1921 EB |
1740 | #ifdef CONFIG_SMP |
1741 | static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask) | |
589e367f | 1742 | { |
3b7d1921 EB |
1743 | struct msi_msg msg; |
1744 | unsigned int dest; | |
1745 | cpumask_t tmp; | |
589e367f | 1746 | int vector; |
3b7d1921 EB |
1747 | |
1748 | cpus_and(tmp, mask, cpu_online_map); | |
1749 | if (cpus_empty(tmp)) | |
1750 | tmp = TARGET_CPUS; | |
1751 | ||
1752 | cpus_and(mask, tmp, CPU_MASK_ALL); | |
589e367f | 1753 | |
550f2299 | 1754 | vector = assign_irq_vector(irq, mask); |
3b7d1921 EB |
1755 | if (vector < 0) |
1756 | return; | |
550f2299 | 1757 | |
3b7d1921 EB |
1758 | cpus_clear(tmp); |
1759 | cpu_set(vector >> 8, tmp); | |
1760 | dest = cpu_mask_to_apicid(tmp); | |
589e367f | 1761 | |
3b7d1921 EB |
1762 | read_msi_msg(irq, &msg); |
1763 | ||
1764 | msg.data &= ~MSI_DATA_VECTOR_MASK; | |
1765 | msg.data |= MSI_DATA_VECTOR(vector); | |
1766 | msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK; | |
1767 | msg.address_lo |= MSI_ADDR_DEST_ID(dest); | |
1768 | ||
1769 | write_msi_msg(irq, &msg); | |
1770 | set_native_irq_info(irq, mask); | |
589e367f | 1771 | } |
3b7d1921 | 1772 | #endif /* CONFIG_SMP */ |
589e367f | 1773 | |
3b7d1921 EB |
1774 | /* |
1775 | * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices, | |
1776 | * which implement the MSI or MSI-X Capability Structure. | |
1777 | */ | |
1778 | static struct irq_chip msi_chip = { | |
1779 | .name = "PCI-MSI", | |
1780 | .unmask = unmask_msi_irq, | |
1781 | .mask = mask_msi_irq, | |
1782 | .ack = ack_apic_edge, | |
1783 | #ifdef CONFIG_SMP | |
1784 | .set_affinity = set_msi_irq_affinity, | |
1785 | #endif | |
1786 | .retrigger = ioapic_retrigger_irq, | |
589e367f EB |
1787 | }; |
1788 | ||
3b7d1921 EB |
1789 | int arch_setup_msi_irq(unsigned int irq, struct pci_dev *dev) |
1790 | { | |
1791 | struct msi_msg msg; | |
1792 | int ret; | |
1793 | ret = msi_compose_msg(dev, irq, &msg); | |
1794 | if (ret < 0) | |
1795 | return ret; | |
1796 | ||
1797 | write_msi_msg(irq, &msg); | |
1798 | ||
1799 | set_irq_chip_and_handler(irq, &msi_chip, handle_edge_irq); | |
1800 | ||
1801 | return 0; | |
1802 | } | |
1803 | ||
1804 | void arch_teardown_msi_irq(unsigned int irq) | |
1805 | { | |
1806 | return; | |
1807 | } | |
1808 | ||
1809 | #endif /* CONFIG_PCI_MSI */ | |
589e367f | 1810 | |
8b955b0d EB |
1811 | /* |
1812 | * Hypertransport interrupt support | |
1813 | */ | |
1814 | #ifdef CONFIG_HT_IRQ | |
1815 | ||
1816 | #ifdef CONFIG_SMP | |
1817 | ||
1818 | static void target_ht_irq(unsigned int irq, unsigned int dest, u8 vector) | |
1819 | { | |
1820 | u32 low, high; | |
1821 | low = read_ht_irq_low(irq); | |
1822 | high = read_ht_irq_high(irq); | |
1823 | ||
1824 | low &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK); | |
1825 | high &= ~(HT_IRQ_HIGH_DEST_ID_MASK); | |
1826 | ||
1827 | low |= HT_IRQ_LOW_VECTOR(vector) | HT_IRQ_LOW_DEST_ID(dest); | |
1828 | high |= HT_IRQ_HIGH_DEST_ID(dest); | |
1829 | ||
1830 | write_ht_irq_low(irq, low); | |
1831 | write_ht_irq_high(irq, high); | |
1832 | } | |
1833 | ||
1834 | static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask) | |
1835 | { | |
1836 | unsigned int dest; | |
1837 | cpumask_t tmp; | |
1838 | int vector; | |
1839 | ||
1840 | cpus_and(tmp, mask, cpu_online_map); | |
1841 | if (cpus_empty(tmp)) | |
1842 | tmp = TARGET_CPUS; | |
1843 | ||
1844 | cpus_and(mask, tmp, CPU_MASK_ALL); | |
1845 | ||
1846 | vector = assign_irq_vector(irq, mask); | |
1847 | if (vector < 0) | |
1848 | return; | |
1849 | ||
1850 | cpus_clear(tmp); | |
1851 | cpu_set(vector >> 8, tmp); | |
1852 | dest = cpu_mask_to_apicid(tmp); | |
1853 | ||
1854 | target_ht_irq(irq, dest, vector & 0xff); | |
1855 | set_native_irq_info(irq, mask); | |
1856 | } | |
1857 | #endif | |
1858 | ||
1859 | static struct hw_interrupt_type ht_irq_chip = { | |
1860 | .name = "PCI-HT", | |
1861 | .mask = mask_ht_irq, | |
1862 | .unmask = unmask_ht_irq, | |
1863 | .ack = ack_apic_edge, | |
1864 | #ifdef CONFIG_SMP | |
1865 | .set_affinity = set_ht_irq_affinity, | |
1866 | #endif | |
1867 | .retrigger = ioapic_retrigger_irq, | |
1868 | }; | |
1869 | ||
1870 | int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev) | |
1871 | { | |
1872 | int vector; | |
1873 | ||
1874 | vector = assign_irq_vector(irq, TARGET_CPUS); | |
1875 | if (vector >= 0) { | |
1876 | u32 low, high; | |
1877 | unsigned dest; | |
1878 | cpumask_t tmp; | |
1879 | ||
1880 | cpus_clear(tmp); | |
1881 | cpu_set(vector >> 8, tmp); | |
1882 | dest = cpu_mask_to_apicid(tmp); | |
1883 | ||
1884 | high = HT_IRQ_HIGH_DEST_ID(dest); | |
1885 | ||
1886 | low = HT_IRQ_LOW_BASE | | |
1887 | HT_IRQ_LOW_DEST_ID(dest) | | |
1888 | HT_IRQ_LOW_VECTOR(vector) | | |
1889 | ((INT_DEST_MODE == 0) ? | |
1890 | HT_IRQ_LOW_DM_PHYSICAL : | |
1891 | HT_IRQ_LOW_DM_LOGICAL) | | |
1892 | HT_IRQ_LOW_RQEOI_EDGE | | |
1893 | ((INT_DELIVERY_MODE != dest_LowestPrio) ? | |
1894 | HT_IRQ_LOW_MT_FIXED : | |
1895 | HT_IRQ_LOW_MT_ARBITRATED); | |
1896 | ||
1897 | write_ht_irq_low(irq, low); | |
1898 | write_ht_irq_high(irq, high); | |
1899 | ||
1900 | set_irq_chip_and_handler(irq, &ht_irq_chip, handle_edge_irq); | |
1901 | } | |
1902 | return vector; | |
1903 | } | |
1904 | #endif /* CONFIG_HT_IRQ */ | |
1905 | ||
1da177e4 LT |
1906 | /* -------------------------------------------------------------------------- |
1907 | ACPI-based IOAPIC Configuration | |
1908 | -------------------------------------------------------------------------- */ | |
1909 | ||
888ba6c6 | 1910 | #ifdef CONFIG_ACPI |
1da177e4 LT |
1911 | |
1912 | #define IO_APIC_MAX_ID 0xFE | |
1913 | ||
1da177e4 LT |
1914 | int __init io_apic_get_redir_entries (int ioapic) |
1915 | { | |
1916 | union IO_APIC_reg_01 reg_01; | |
1917 | unsigned long flags; | |
1918 | ||
1919 | spin_lock_irqsave(&ioapic_lock, flags); | |
1920 | reg_01.raw = io_apic_read(ioapic, 1); | |
1921 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
1922 | ||
1923 | return reg_01.bits.entries; | |
1924 | } | |
1925 | ||
1926 | ||
50eca3eb | 1927 | int io_apic_set_pci_routing (int ioapic, int pin, int irq, int triggering, int polarity) |
1da177e4 LT |
1928 | { |
1929 | struct IO_APIC_route_entry entry; | |
1930 | unsigned long flags; | |
550f2299 EB |
1931 | int vector; |
1932 | cpumask_t mask; | |
1da177e4 LT |
1933 | |
1934 | if (!IO_APIC_IRQ(irq)) { | |
1935 | apic_printk(APIC_QUIET,KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n", | |
1936 | ioapic); | |
1937 | return -EINVAL; | |
1938 | } | |
1939 | ||
550f2299 EB |
1940 | /* |
1941 | * IRQs < 16 are already in the irq_2_pin[] map | |
1942 | */ | |
1943 | if (irq >= 16) | |
1944 | add_pin_to_irq(irq, ioapic, pin); | |
1945 | ||
1946 | ||
1947 | vector = assign_irq_vector(irq, TARGET_CPUS); | |
1948 | if (vector < 0) | |
1949 | return vector; | |
1950 | ||
1951 | cpus_clear(mask); | |
1952 | cpu_set(vector >> 8, mask); | |
1953 | ||
1da177e4 LT |
1954 | /* |
1955 | * Generate a PCI IRQ routing entry and program the IOAPIC accordingly. | |
1956 | * Note that we mask (disable) IRQs now -- these get enabled when the | |
1957 | * corresponding device driver registers for this IRQ. | |
1958 | */ | |
1959 | ||
1960 | memset(&entry,0,sizeof(entry)); | |
1961 | ||
1962 | entry.delivery_mode = INT_DELIVERY_MODE; | |
1963 | entry.dest_mode = INT_DEST_MODE; | |
550f2299 | 1964 | entry.dest.logical.logical_dest = cpu_mask_to_apicid(mask); |
50eca3eb BM |
1965 | entry.trigger = triggering; |
1966 | entry.polarity = polarity; | |
1da177e4 | 1967 | entry.mask = 1; /* Disabled (masked) */ |
550f2299 | 1968 | entry.vector = vector & 0xff; |
1da177e4 LT |
1969 | |
1970 | apic_printk(APIC_VERBOSE,KERN_DEBUG "IOAPIC[%d]: Set PCI routing entry (%d-%d -> 0x%x -> " | |
1971 | "IRQ %d Mode:%i Active:%i)\n", ioapic, | |
1972 | mp_ioapics[ioapic].mpc_apicid, pin, entry.vector, irq, | |
50eca3eb | 1973 | triggering, polarity); |
1da177e4 | 1974 | |
50eca3eb | 1975 | ioapic_register_intr(irq, entry.vector, triggering); |
1da177e4 LT |
1976 | |
1977 | if (!ioapic && (irq < 16)) | |
1978 | disable_8259A_irq(irq); | |
1979 | ||
eea0e11c AK |
1980 | ioapic_write_entry(ioapic, pin, entry); |
1981 | ||
1da177e4 | 1982 | spin_lock_irqsave(&ioapic_lock, flags); |
04b9267b | 1983 | set_native_irq_info(irq, TARGET_CPUS); |
1da177e4 LT |
1984 | spin_unlock_irqrestore(&ioapic_lock, flags); |
1985 | ||
1986 | return 0; | |
1987 | } | |
1988 | ||
888ba6c6 | 1989 | #endif /* CONFIG_ACPI */ |
1da177e4 LT |
1990 | |
1991 | ||
1992 | /* | |
1993 | * This function currently is only a helper for the i386 smp boot process where | |
1994 | * we need to reprogram the ioredtbls to cater for the cpus which have come online | |
1995 | * so mask in all cases should simply be TARGET_CPUS | |
1996 | */ | |
54d5d424 | 1997 | #ifdef CONFIG_SMP |
1da177e4 LT |
1998 | void __init setup_ioapic_dest(void) |
1999 | { | |
2000 | int pin, ioapic, irq, irq_entry; | |
2001 | ||
2002 | if (skip_ioapic_setup == 1) | |
2003 | return; | |
2004 | ||
2005 | for (ioapic = 0; ioapic < nr_ioapics; ioapic++) { | |
2006 | for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) { | |
2007 | irq_entry = find_irq_entry(ioapic, pin, mp_INT); | |
2008 | if (irq_entry == -1) | |
2009 | continue; | |
2010 | irq = pin_2_irq(irq_entry, ioapic, pin); | |
2011 | set_ioapic_affinity_irq(irq, TARGET_CPUS); | |
2012 | } | |
2013 | ||
2014 | } | |
2015 | } | |
54d5d424 | 2016 | #endif |