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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> | |
24 | #include <linux/irq.h> | |
25 | #include <linux/interrupt.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/delay.h> | |
28 | #include <linux/sched.h> | |
29 | #include <linux/config.h> | |
30 | #include <linux/smp_lock.h> | |
31 | #include <linux/mc146818rtc.h> | |
32 | #include <linux/compiler.h> | |
33 | #include <linux/acpi.h> | |
129f6946 | 34 | #include <linux/module.h> |
1da177e4 LT |
35 | #include <linux/sysdev.h> |
36 | #include <asm/io.h> | |
37 | #include <asm/smp.h> | |
38 | #include <asm/desc.h> | |
39 | #include <asm/timer.h> | |
40 | ||
41 | #include <mach_apic.h> | |
42 | ||
43 | #include "io_ports.h" | |
44 | ||
45 | int (*ioapic_renumber_irq)(int ioapic, int irq); | |
46 | atomic_t irq_mis_count; | |
47 | ||
48 | static DEFINE_SPINLOCK(ioapic_lock); | |
49 | ||
50 | /* | |
51 | * Is the SiS APIC rmw bug present ? | |
52 | * -1 = don't know, 0 = no, 1 = yes | |
53 | */ | |
54 | int sis_apic_bug = -1; | |
55 | ||
56 | /* | |
57 | * # of IRQ routing registers | |
58 | */ | |
59 | int nr_ioapic_registers[MAX_IO_APICS]; | |
60 | ||
61 | /* | |
62 | * Rough estimation of how many shared IRQs there are, can | |
63 | * be changed anytime. | |
64 | */ | |
65 | #define MAX_PLUS_SHARED_IRQS NR_IRQS | |
66 | #define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS) | |
67 | ||
68 | /* | |
69 | * This is performance-critical, we want to do it O(1) | |
70 | * | |
71 | * the indexing order of this array favors 1:1 mappings | |
72 | * between pins and IRQs. | |
73 | */ | |
74 | ||
75 | static struct irq_pin_list { | |
76 | int apic, pin, next; | |
77 | } irq_2_pin[PIN_MAP_SIZE]; | |
78 | ||
79 | int vector_irq[NR_VECTORS] = { [0 ... NR_VECTORS - 1] = -1}; | |
80 | #ifdef CONFIG_PCI_MSI | |
81 | #define vector_to_irq(vector) \ | |
82 | (platform_legacy_irq(vector) ? vector : vector_irq[vector]) | |
83 | #else | |
84 | #define vector_to_irq(vector) (vector) | |
85 | #endif | |
86 | ||
87 | /* | |
88 | * The common case is 1:1 IRQ<->pin mappings. Sometimes there are | |
89 | * shared ISA-space IRQs, so we have to support them. We are super | |
90 | * fast in the common case, and fast for shared ISA-space IRQs. | |
91 | */ | |
92 | static void add_pin_to_irq(unsigned int irq, int apic, int pin) | |
93 | { | |
94 | static int first_free_entry = NR_IRQS; | |
95 | struct irq_pin_list *entry = irq_2_pin + irq; | |
96 | ||
97 | while (entry->next) | |
98 | entry = irq_2_pin + entry->next; | |
99 | ||
100 | if (entry->pin != -1) { | |
101 | entry->next = first_free_entry; | |
102 | entry = irq_2_pin + entry->next; | |
103 | if (++first_free_entry >= PIN_MAP_SIZE) | |
104 | panic("io_apic.c: whoops"); | |
105 | } | |
106 | entry->apic = apic; | |
107 | entry->pin = pin; | |
108 | } | |
109 | ||
110 | /* | |
111 | * Reroute an IRQ to a different pin. | |
112 | */ | |
113 | static void __init replace_pin_at_irq(unsigned int irq, | |
114 | int oldapic, int oldpin, | |
115 | int newapic, int newpin) | |
116 | { | |
117 | struct irq_pin_list *entry = irq_2_pin + irq; | |
118 | ||
119 | while (1) { | |
120 | if (entry->apic == oldapic && entry->pin == oldpin) { | |
121 | entry->apic = newapic; | |
122 | entry->pin = newpin; | |
123 | } | |
124 | if (!entry->next) | |
125 | break; | |
126 | entry = irq_2_pin + entry->next; | |
127 | } | |
128 | } | |
129 | ||
130 | static void __modify_IO_APIC_irq (unsigned int irq, unsigned long enable, unsigned long disable) | |
131 | { | |
132 | struct irq_pin_list *entry = irq_2_pin + irq; | |
133 | unsigned int pin, reg; | |
134 | ||
135 | for (;;) { | |
136 | pin = entry->pin; | |
137 | if (pin == -1) | |
138 | break; | |
139 | reg = io_apic_read(entry->apic, 0x10 + pin*2); | |
140 | reg &= ~disable; | |
141 | reg |= enable; | |
142 | io_apic_modify(entry->apic, 0x10 + pin*2, reg); | |
143 | if (!entry->next) | |
144 | break; | |
145 | entry = irq_2_pin + entry->next; | |
146 | } | |
147 | } | |
148 | ||
149 | /* mask = 1 */ | |
150 | static void __mask_IO_APIC_irq (unsigned int irq) | |
151 | { | |
152 | __modify_IO_APIC_irq(irq, 0x00010000, 0); | |
153 | } | |
154 | ||
155 | /* mask = 0 */ | |
156 | static void __unmask_IO_APIC_irq (unsigned int irq) | |
157 | { | |
158 | __modify_IO_APIC_irq(irq, 0, 0x00010000); | |
159 | } | |
160 | ||
161 | /* mask = 1, trigger = 0 */ | |
162 | static void __mask_and_edge_IO_APIC_irq (unsigned int irq) | |
163 | { | |
164 | __modify_IO_APIC_irq(irq, 0x00010000, 0x00008000); | |
165 | } | |
166 | ||
167 | /* mask = 0, trigger = 1 */ | |
168 | static void __unmask_and_level_IO_APIC_irq (unsigned int irq) | |
169 | { | |
170 | __modify_IO_APIC_irq(irq, 0x00008000, 0x00010000); | |
171 | } | |
172 | ||
173 | static void mask_IO_APIC_irq (unsigned int irq) | |
174 | { | |
175 | unsigned long flags; | |
176 | ||
177 | spin_lock_irqsave(&ioapic_lock, flags); | |
178 | __mask_IO_APIC_irq(irq); | |
179 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
180 | } | |
181 | ||
182 | static void unmask_IO_APIC_irq (unsigned int irq) | |
183 | { | |
184 | unsigned long flags; | |
185 | ||
186 | spin_lock_irqsave(&ioapic_lock, flags); | |
187 | __unmask_IO_APIC_irq(irq); | |
188 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
189 | } | |
190 | ||
191 | static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin) | |
192 | { | |
193 | struct IO_APIC_route_entry entry; | |
194 | unsigned long flags; | |
195 | ||
196 | /* Check delivery_mode to be sure we're not clearing an SMI pin */ | |
197 | spin_lock_irqsave(&ioapic_lock, flags); | |
198 | *(((int*)&entry) + 0) = io_apic_read(apic, 0x10 + 2 * pin); | |
199 | *(((int*)&entry) + 1) = io_apic_read(apic, 0x11 + 2 * pin); | |
200 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
201 | if (entry.delivery_mode == dest_SMI) | |
202 | return; | |
203 | ||
204 | /* | |
205 | * Disable it in the IO-APIC irq-routing table: | |
206 | */ | |
207 | memset(&entry, 0, sizeof(entry)); | |
208 | entry.mask = 1; | |
209 | spin_lock_irqsave(&ioapic_lock, flags); | |
210 | io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry) + 0)); | |
211 | io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry) + 1)); | |
212 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
213 | } | |
214 | ||
215 | static void clear_IO_APIC (void) | |
216 | { | |
217 | int apic, pin; | |
218 | ||
219 | for (apic = 0; apic < nr_ioapics; apic++) | |
220 | for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) | |
221 | clear_IO_APIC_pin(apic, pin); | |
222 | } | |
223 | ||
224 | static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t cpumask) | |
225 | { | |
226 | unsigned long flags; | |
227 | int pin; | |
228 | struct irq_pin_list *entry = irq_2_pin + irq; | |
229 | unsigned int apicid_value; | |
230 | ||
231 | apicid_value = cpu_mask_to_apicid(cpumask); | |
232 | /* Prepare to do the io_apic_write */ | |
233 | apicid_value = apicid_value << 24; | |
234 | spin_lock_irqsave(&ioapic_lock, flags); | |
235 | for (;;) { | |
236 | pin = entry->pin; | |
237 | if (pin == -1) | |
238 | break; | |
239 | io_apic_write(entry->apic, 0x10 + 1 + pin*2, apicid_value); | |
240 | if (!entry->next) | |
241 | break; | |
242 | entry = irq_2_pin + entry->next; | |
243 | } | |
244 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
245 | } | |
246 | ||
247 | #if defined(CONFIG_IRQBALANCE) | |
248 | # include <asm/processor.h> /* kernel_thread() */ | |
249 | # include <linux/kernel_stat.h> /* kstat */ | |
250 | # include <linux/slab.h> /* kmalloc() */ | |
251 | # include <linux/timer.h> /* time_after() */ | |
252 | ||
253 | # ifdef CONFIG_BALANCED_IRQ_DEBUG | |
254 | # define TDprintk(x...) do { printk("<%ld:%s:%d>: ", jiffies, __FILE__, __LINE__); printk(x); } while (0) | |
255 | # define Dprintk(x...) do { TDprintk(x); } while (0) | |
256 | # else | |
257 | # define TDprintk(x...) | |
258 | # define Dprintk(x...) | |
259 | # endif | |
260 | ||
261 | cpumask_t __cacheline_aligned pending_irq_balance_cpumask[NR_IRQS]; | |
262 | ||
263 | #define IRQBALANCE_CHECK_ARCH -999 | |
264 | static int irqbalance_disabled = IRQBALANCE_CHECK_ARCH; | |
265 | static int physical_balance = 0; | |
266 | ||
267 | static struct irq_cpu_info { | |
268 | unsigned long * last_irq; | |
269 | unsigned long * irq_delta; | |
270 | unsigned long irq; | |
271 | } irq_cpu_data[NR_CPUS]; | |
272 | ||
273 | #define CPU_IRQ(cpu) (irq_cpu_data[cpu].irq) | |
274 | #define LAST_CPU_IRQ(cpu,irq) (irq_cpu_data[cpu].last_irq[irq]) | |
275 | #define IRQ_DELTA(cpu,irq) (irq_cpu_data[cpu].irq_delta[irq]) | |
276 | ||
277 | #define IDLE_ENOUGH(cpu,now) \ | |
278 | (idle_cpu(cpu) && ((now) - per_cpu(irq_stat, (cpu)).idle_timestamp > 1)) | |
279 | ||
280 | #define IRQ_ALLOWED(cpu, allowed_mask) cpu_isset(cpu, allowed_mask) | |
281 | ||
282 | #define CPU_TO_PACKAGEINDEX(i) (first_cpu(cpu_sibling_map[i])) | |
283 | ||
284 | #define MAX_BALANCED_IRQ_INTERVAL (5*HZ) | |
285 | #define MIN_BALANCED_IRQ_INTERVAL (HZ/2) | |
286 | #define BALANCED_IRQ_MORE_DELTA (HZ/10) | |
287 | #define BALANCED_IRQ_LESS_DELTA (HZ) | |
288 | ||
289 | static long balanced_irq_interval = MAX_BALANCED_IRQ_INTERVAL; | |
290 | ||
291 | static unsigned long move(int curr_cpu, cpumask_t allowed_mask, | |
292 | unsigned long now, int direction) | |
293 | { | |
294 | int search_idle = 1; | |
295 | int cpu = curr_cpu; | |
296 | ||
297 | goto inside; | |
298 | ||
299 | do { | |
300 | if (unlikely(cpu == curr_cpu)) | |
301 | search_idle = 0; | |
302 | inside: | |
303 | if (direction == 1) { | |
304 | cpu++; | |
305 | if (cpu >= NR_CPUS) | |
306 | cpu = 0; | |
307 | } else { | |
308 | cpu--; | |
309 | if (cpu == -1) | |
310 | cpu = NR_CPUS-1; | |
311 | } | |
312 | } while (!cpu_online(cpu) || !IRQ_ALLOWED(cpu,allowed_mask) || | |
313 | (search_idle && !IDLE_ENOUGH(cpu,now))); | |
314 | ||
315 | return cpu; | |
316 | } | |
317 | ||
318 | static inline void balance_irq(int cpu, int irq) | |
319 | { | |
320 | unsigned long now = jiffies; | |
321 | cpumask_t allowed_mask; | |
322 | unsigned int new_cpu; | |
323 | ||
324 | if (irqbalance_disabled) | |
325 | return; | |
326 | ||
327 | cpus_and(allowed_mask, cpu_online_map, irq_affinity[irq]); | |
328 | new_cpu = move(cpu, allowed_mask, now, 1); | |
329 | if (cpu != new_cpu) { | |
330 | irq_desc_t *desc = irq_desc + irq; | |
331 | unsigned long flags; | |
332 | ||
333 | spin_lock_irqsave(&desc->lock, flags); | |
334 | pending_irq_balance_cpumask[irq] = cpumask_of_cpu(new_cpu); | |
335 | spin_unlock_irqrestore(&desc->lock, flags); | |
336 | } | |
337 | } | |
338 | ||
339 | static inline void rotate_irqs_among_cpus(unsigned long useful_load_threshold) | |
340 | { | |
341 | int i, j; | |
342 | Dprintk("Rotating IRQs among CPUs.\n"); | |
343 | for (i = 0; i < NR_CPUS; i++) { | |
344 | for (j = 0; cpu_online(i) && (j < NR_IRQS); j++) { | |
345 | if (!irq_desc[j].action) | |
346 | continue; | |
347 | /* Is it a significant load ? */ | |
348 | if (IRQ_DELTA(CPU_TO_PACKAGEINDEX(i),j) < | |
349 | useful_load_threshold) | |
350 | continue; | |
351 | balance_irq(i, j); | |
352 | } | |
353 | } | |
354 | balanced_irq_interval = max((long)MIN_BALANCED_IRQ_INTERVAL, | |
355 | balanced_irq_interval - BALANCED_IRQ_LESS_DELTA); | |
356 | return; | |
357 | } | |
358 | ||
359 | static void do_irq_balance(void) | |
360 | { | |
361 | int i, j; | |
362 | unsigned long max_cpu_irq = 0, min_cpu_irq = (~0); | |
363 | unsigned long move_this_load = 0; | |
364 | int max_loaded = 0, min_loaded = 0; | |
365 | int load; | |
366 | unsigned long useful_load_threshold = balanced_irq_interval + 10; | |
367 | int selected_irq; | |
368 | int tmp_loaded, first_attempt = 1; | |
369 | unsigned long tmp_cpu_irq; | |
370 | unsigned long imbalance = 0; | |
371 | cpumask_t allowed_mask, target_cpu_mask, tmp; | |
372 | ||
373 | for (i = 0; i < NR_CPUS; i++) { | |
374 | int package_index; | |
375 | CPU_IRQ(i) = 0; | |
376 | if (!cpu_online(i)) | |
377 | continue; | |
378 | package_index = CPU_TO_PACKAGEINDEX(i); | |
379 | for (j = 0; j < NR_IRQS; j++) { | |
380 | unsigned long value_now, delta; | |
381 | /* Is this an active IRQ? */ | |
382 | if (!irq_desc[j].action) | |
383 | continue; | |
384 | if ( package_index == i ) | |
385 | IRQ_DELTA(package_index,j) = 0; | |
386 | /* Determine the total count per processor per IRQ */ | |
387 | value_now = (unsigned long) kstat_cpu(i).irqs[j]; | |
388 | ||
389 | /* Determine the activity per processor per IRQ */ | |
390 | delta = value_now - LAST_CPU_IRQ(i,j); | |
391 | ||
392 | /* Update last_cpu_irq[][] for the next time */ | |
393 | LAST_CPU_IRQ(i,j) = value_now; | |
394 | ||
395 | /* Ignore IRQs whose rate is less than the clock */ | |
396 | if (delta < useful_load_threshold) | |
397 | continue; | |
398 | /* update the load for the processor or package total */ | |
399 | IRQ_DELTA(package_index,j) += delta; | |
400 | ||
401 | /* Keep track of the higher numbered sibling as well */ | |
402 | if (i != package_index) | |
403 | CPU_IRQ(i) += delta; | |
404 | /* | |
405 | * We have sibling A and sibling B in the package | |
406 | * | |
407 | * cpu_irq[A] = load for cpu A + load for cpu B | |
408 | * cpu_irq[B] = load for cpu B | |
409 | */ | |
410 | CPU_IRQ(package_index) += delta; | |
411 | } | |
412 | } | |
413 | /* Find the least loaded processor package */ | |
414 | for (i = 0; i < NR_CPUS; i++) { | |
415 | if (!cpu_online(i)) | |
416 | continue; | |
417 | if (i != CPU_TO_PACKAGEINDEX(i)) | |
418 | continue; | |
419 | if (min_cpu_irq > CPU_IRQ(i)) { | |
420 | min_cpu_irq = CPU_IRQ(i); | |
421 | min_loaded = i; | |
422 | } | |
423 | } | |
424 | max_cpu_irq = ULONG_MAX; | |
425 | ||
426 | tryanothercpu: | |
427 | /* Look for heaviest loaded processor. | |
428 | * We may come back to get the next heaviest loaded processor. | |
429 | * Skip processors with trivial loads. | |
430 | */ | |
431 | tmp_cpu_irq = 0; | |
432 | tmp_loaded = -1; | |
433 | for (i = 0; i < NR_CPUS; i++) { | |
434 | if (!cpu_online(i)) | |
435 | continue; | |
436 | if (i != CPU_TO_PACKAGEINDEX(i)) | |
437 | continue; | |
438 | if (max_cpu_irq <= CPU_IRQ(i)) | |
439 | continue; | |
440 | if (tmp_cpu_irq < CPU_IRQ(i)) { | |
441 | tmp_cpu_irq = CPU_IRQ(i); | |
442 | tmp_loaded = i; | |
443 | } | |
444 | } | |
445 | ||
446 | if (tmp_loaded == -1) { | |
447 | /* In the case of small number of heavy interrupt sources, | |
448 | * loading some of the cpus too much. We use Ingo's original | |
449 | * approach to rotate them around. | |
450 | */ | |
451 | if (!first_attempt && imbalance >= useful_load_threshold) { | |
452 | rotate_irqs_among_cpus(useful_load_threshold); | |
453 | return; | |
454 | } | |
455 | goto not_worth_the_effort; | |
456 | } | |
457 | ||
458 | first_attempt = 0; /* heaviest search */ | |
459 | max_cpu_irq = tmp_cpu_irq; /* load */ | |
460 | max_loaded = tmp_loaded; /* processor */ | |
461 | imbalance = (max_cpu_irq - min_cpu_irq) / 2; | |
462 | ||
463 | Dprintk("max_loaded cpu = %d\n", max_loaded); | |
464 | Dprintk("min_loaded cpu = %d\n", min_loaded); | |
465 | Dprintk("max_cpu_irq load = %ld\n", max_cpu_irq); | |
466 | Dprintk("min_cpu_irq load = %ld\n", min_cpu_irq); | |
467 | Dprintk("load imbalance = %lu\n", imbalance); | |
468 | ||
469 | /* if imbalance is less than approx 10% of max load, then | |
470 | * observe diminishing returns action. - quit | |
471 | */ | |
472 | if (imbalance < (max_cpu_irq >> 3)) { | |
473 | Dprintk("Imbalance too trivial\n"); | |
474 | goto not_worth_the_effort; | |
475 | } | |
476 | ||
477 | tryanotherirq: | |
478 | /* if we select an IRQ to move that can't go where we want, then | |
479 | * see if there is another one to try. | |
480 | */ | |
481 | move_this_load = 0; | |
482 | selected_irq = -1; | |
483 | for (j = 0; j < NR_IRQS; j++) { | |
484 | /* Is this an active IRQ? */ | |
485 | if (!irq_desc[j].action) | |
486 | continue; | |
487 | if (imbalance <= IRQ_DELTA(max_loaded,j)) | |
488 | continue; | |
489 | /* Try to find the IRQ that is closest to the imbalance | |
490 | * without going over. | |
491 | */ | |
492 | if (move_this_load < IRQ_DELTA(max_loaded,j)) { | |
493 | move_this_load = IRQ_DELTA(max_loaded,j); | |
494 | selected_irq = j; | |
495 | } | |
496 | } | |
497 | if (selected_irq == -1) { | |
498 | goto tryanothercpu; | |
499 | } | |
500 | ||
501 | imbalance = move_this_load; | |
502 | ||
503 | /* For physical_balance case, we accumlated both load | |
504 | * values in the one of the siblings cpu_irq[], | |
505 | * to use the same code for physical and logical processors | |
506 | * as much as possible. | |
507 | * | |
508 | * NOTE: the cpu_irq[] array holds the sum of the load for | |
509 | * sibling A and sibling B in the slot for the lowest numbered | |
510 | * sibling (A), _AND_ the load for sibling B in the slot for | |
511 | * the higher numbered sibling. | |
512 | * | |
513 | * We seek the least loaded sibling by making the comparison | |
514 | * (A+B)/2 vs B | |
515 | */ | |
516 | load = CPU_IRQ(min_loaded) >> 1; | |
517 | for_each_cpu_mask(j, cpu_sibling_map[min_loaded]) { | |
518 | if (load > CPU_IRQ(j)) { | |
519 | /* This won't change cpu_sibling_map[min_loaded] */ | |
520 | load = CPU_IRQ(j); | |
521 | min_loaded = j; | |
522 | } | |
523 | } | |
524 | ||
525 | cpus_and(allowed_mask, cpu_online_map, irq_affinity[selected_irq]); | |
526 | target_cpu_mask = cpumask_of_cpu(min_loaded); | |
527 | cpus_and(tmp, target_cpu_mask, allowed_mask); | |
528 | ||
529 | if (!cpus_empty(tmp)) { | |
530 | irq_desc_t *desc = irq_desc + selected_irq; | |
531 | unsigned long flags; | |
532 | ||
533 | Dprintk("irq = %d moved to cpu = %d\n", | |
534 | selected_irq, min_loaded); | |
535 | /* mark for change destination */ | |
536 | spin_lock_irqsave(&desc->lock, flags); | |
537 | pending_irq_balance_cpumask[selected_irq] = | |
538 | cpumask_of_cpu(min_loaded); | |
539 | spin_unlock_irqrestore(&desc->lock, flags); | |
540 | /* Since we made a change, come back sooner to | |
541 | * check for more variation. | |
542 | */ | |
543 | balanced_irq_interval = max((long)MIN_BALANCED_IRQ_INTERVAL, | |
544 | balanced_irq_interval - BALANCED_IRQ_LESS_DELTA); | |
545 | return; | |
546 | } | |
547 | goto tryanotherirq; | |
548 | ||
549 | not_worth_the_effort: | |
550 | /* | |
551 | * if we did not find an IRQ to move, then adjust the time interval | |
552 | * upward | |
553 | */ | |
554 | balanced_irq_interval = min((long)MAX_BALANCED_IRQ_INTERVAL, | |
555 | balanced_irq_interval + BALANCED_IRQ_MORE_DELTA); | |
556 | Dprintk("IRQ worth rotating not found\n"); | |
557 | return; | |
558 | } | |
559 | ||
560 | static int balanced_irq(void *unused) | |
561 | { | |
562 | int i; | |
563 | unsigned long prev_balance_time = jiffies; | |
564 | long time_remaining = balanced_irq_interval; | |
565 | ||
566 | daemonize("kirqd"); | |
567 | ||
568 | /* push everything to CPU 0 to give us a starting point. */ | |
569 | for (i = 0 ; i < NR_IRQS ; i++) { | |
570 | pending_irq_balance_cpumask[i] = cpumask_of_cpu(0); | |
571 | } | |
572 | ||
573 | for ( ; ; ) { | |
574 | set_current_state(TASK_INTERRUPTIBLE); | |
575 | time_remaining = schedule_timeout(time_remaining); | |
3e1d1d28 | 576 | try_to_freeze(); |
1da177e4 LT |
577 | if (time_after(jiffies, |
578 | prev_balance_time+balanced_irq_interval)) { | |
f3705136 | 579 | preempt_disable(); |
1da177e4 LT |
580 | do_irq_balance(); |
581 | prev_balance_time = jiffies; | |
582 | time_remaining = balanced_irq_interval; | |
f3705136 | 583 | preempt_enable(); |
1da177e4 LT |
584 | } |
585 | } | |
586 | return 0; | |
587 | } | |
588 | ||
589 | static int __init balanced_irq_init(void) | |
590 | { | |
591 | int i; | |
592 | struct cpuinfo_x86 *c; | |
593 | cpumask_t tmp; | |
594 | ||
595 | cpus_shift_right(tmp, cpu_online_map, 2); | |
596 | c = &boot_cpu_data; | |
597 | /* When not overwritten by the command line ask subarchitecture. */ | |
598 | if (irqbalance_disabled == IRQBALANCE_CHECK_ARCH) | |
599 | irqbalance_disabled = NO_BALANCE_IRQ; | |
600 | if (irqbalance_disabled) | |
601 | return 0; | |
602 | ||
603 | /* disable irqbalance completely if there is only one processor online */ | |
604 | if (num_online_cpus() < 2) { | |
605 | irqbalance_disabled = 1; | |
606 | return 0; | |
607 | } | |
608 | /* | |
609 | * Enable physical balance only if more than 1 physical processor | |
610 | * is present | |
611 | */ | |
612 | if (smp_num_siblings > 1 && !cpus_empty(tmp)) | |
613 | physical_balance = 1; | |
614 | ||
615 | for (i = 0; i < NR_CPUS; i++) { | |
616 | if (!cpu_online(i)) | |
617 | continue; | |
618 | irq_cpu_data[i].irq_delta = kmalloc(sizeof(unsigned long) * NR_IRQS, GFP_KERNEL); | |
619 | irq_cpu_data[i].last_irq = kmalloc(sizeof(unsigned long) * NR_IRQS, GFP_KERNEL); | |
620 | if (irq_cpu_data[i].irq_delta == NULL || irq_cpu_data[i].last_irq == NULL) { | |
621 | printk(KERN_ERR "balanced_irq_init: out of memory"); | |
622 | goto failed; | |
623 | } | |
624 | memset(irq_cpu_data[i].irq_delta,0,sizeof(unsigned long) * NR_IRQS); | |
625 | memset(irq_cpu_data[i].last_irq,0,sizeof(unsigned long) * NR_IRQS); | |
626 | } | |
627 | ||
628 | printk(KERN_INFO "Starting balanced_irq\n"); | |
629 | if (kernel_thread(balanced_irq, NULL, CLONE_KERNEL) >= 0) | |
630 | return 0; | |
631 | else | |
632 | printk(KERN_ERR "balanced_irq_init: failed to spawn balanced_irq"); | |
633 | failed: | |
634 | for (i = 0; i < NR_CPUS; i++) { | |
4ae6673e JJ |
635 | kfree(irq_cpu_data[i].irq_delta); |
636 | kfree(irq_cpu_data[i].last_irq); | |
1da177e4 LT |
637 | } |
638 | return 0; | |
639 | } | |
640 | ||
641 | int __init irqbalance_disable(char *str) | |
642 | { | |
643 | irqbalance_disabled = 1; | |
644 | return 0; | |
645 | } | |
646 | ||
647 | __setup("noirqbalance", irqbalance_disable); | |
648 | ||
649 | static inline void move_irq(int irq) | |
650 | { | |
651 | /* note - we hold the desc->lock */ | |
652 | if (unlikely(!cpus_empty(pending_irq_balance_cpumask[irq]))) { | |
653 | set_ioapic_affinity_irq(irq, pending_irq_balance_cpumask[irq]); | |
654 | cpus_clear(pending_irq_balance_cpumask[irq]); | |
655 | } | |
656 | } | |
657 | ||
658 | late_initcall(balanced_irq_init); | |
659 | ||
660 | #else /* !CONFIG_IRQBALANCE */ | |
661 | static inline void move_irq(int irq) { } | |
662 | #endif /* CONFIG_IRQBALANCE */ | |
663 | ||
664 | #ifndef CONFIG_SMP | |
665 | void fastcall send_IPI_self(int vector) | |
666 | { | |
667 | unsigned int cfg; | |
668 | ||
669 | /* | |
670 | * Wait for idle. | |
671 | */ | |
672 | apic_wait_icr_idle(); | |
673 | cfg = APIC_DM_FIXED | APIC_DEST_SELF | vector | APIC_DEST_LOGICAL; | |
674 | /* | |
675 | * Send the IPI. The write to APIC_ICR fires this off. | |
676 | */ | |
677 | apic_write_around(APIC_ICR, cfg); | |
678 | } | |
679 | #endif /* !CONFIG_SMP */ | |
680 | ||
681 | ||
682 | /* | |
683 | * support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to | |
684 | * specific CPU-side IRQs. | |
685 | */ | |
686 | ||
687 | #define MAX_PIRQS 8 | |
688 | static int pirq_entries [MAX_PIRQS]; | |
689 | static int pirqs_enabled; | |
690 | int skip_ioapic_setup; | |
691 | ||
692 | static int __init ioapic_setup(char *str) | |
693 | { | |
694 | skip_ioapic_setup = 1; | |
695 | return 1; | |
696 | } | |
697 | ||
698 | __setup("noapic", ioapic_setup); | |
699 | ||
700 | static int __init ioapic_pirq_setup(char *str) | |
701 | { | |
702 | int i, max; | |
703 | int ints[MAX_PIRQS+1]; | |
704 | ||
705 | get_options(str, ARRAY_SIZE(ints), ints); | |
706 | ||
707 | for (i = 0; i < MAX_PIRQS; i++) | |
708 | pirq_entries[i] = -1; | |
709 | ||
710 | pirqs_enabled = 1; | |
711 | apic_printk(APIC_VERBOSE, KERN_INFO | |
712 | "PIRQ redirection, working around broken MP-BIOS.\n"); | |
713 | max = MAX_PIRQS; | |
714 | if (ints[0] < MAX_PIRQS) | |
715 | max = ints[0]; | |
716 | ||
717 | for (i = 0; i < max; i++) { | |
718 | apic_printk(APIC_VERBOSE, KERN_DEBUG | |
719 | "... PIRQ%d -> IRQ %d\n", i, ints[i+1]); | |
720 | /* | |
721 | * PIRQs are mapped upside down, usually. | |
722 | */ | |
723 | pirq_entries[MAX_PIRQS-i-1] = ints[i+1]; | |
724 | } | |
725 | return 1; | |
726 | } | |
727 | ||
728 | __setup("pirq=", ioapic_pirq_setup); | |
729 | ||
730 | /* | |
731 | * Find the IRQ entry number of a certain pin. | |
732 | */ | |
733 | static int find_irq_entry(int apic, int pin, int type) | |
734 | { | |
735 | int i; | |
736 | ||
737 | for (i = 0; i < mp_irq_entries; i++) | |
738 | if (mp_irqs[i].mpc_irqtype == type && | |
739 | (mp_irqs[i].mpc_dstapic == mp_ioapics[apic].mpc_apicid || | |
740 | mp_irqs[i].mpc_dstapic == MP_APIC_ALL) && | |
741 | mp_irqs[i].mpc_dstirq == pin) | |
742 | return i; | |
743 | ||
744 | return -1; | |
745 | } | |
746 | ||
747 | /* | |
748 | * Find the pin to which IRQ[irq] (ISA) is connected | |
749 | */ | |
750 | static int find_isa_irq_pin(int irq, int type) | |
751 | { | |
752 | int i; | |
753 | ||
754 | for (i = 0; i < mp_irq_entries; i++) { | |
755 | int lbus = mp_irqs[i].mpc_srcbus; | |
756 | ||
757 | if ((mp_bus_id_to_type[lbus] == MP_BUS_ISA || | |
758 | mp_bus_id_to_type[lbus] == MP_BUS_EISA || | |
759 | mp_bus_id_to_type[lbus] == MP_BUS_MCA || | |
760 | mp_bus_id_to_type[lbus] == MP_BUS_NEC98 | |
761 | ) && | |
762 | (mp_irqs[i].mpc_irqtype == type) && | |
763 | (mp_irqs[i].mpc_srcbusirq == irq)) | |
764 | ||
765 | return mp_irqs[i].mpc_dstirq; | |
766 | } | |
767 | return -1; | |
768 | } | |
769 | ||
770 | /* | |
771 | * Find a specific PCI IRQ entry. | |
772 | * Not an __init, possibly needed by modules | |
773 | */ | |
774 | static int pin_2_irq(int idx, int apic, int pin); | |
775 | ||
776 | int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin) | |
777 | { | |
778 | int apic, i, best_guess = -1; | |
779 | ||
780 | apic_printk(APIC_DEBUG, "querying PCI -> IRQ mapping bus:%d, " | |
781 | "slot:%d, pin:%d.\n", bus, slot, pin); | |
782 | if (mp_bus_id_to_pci_bus[bus] == -1) { | |
783 | printk(KERN_WARNING "PCI BIOS passed nonexistent PCI bus %d!\n", bus); | |
784 | return -1; | |
785 | } | |
786 | for (i = 0; i < mp_irq_entries; i++) { | |
787 | int lbus = mp_irqs[i].mpc_srcbus; | |
788 | ||
789 | for (apic = 0; apic < nr_ioapics; apic++) | |
790 | if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic || | |
791 | mp_irqs[i].mpc_dstapic == MP_APIC_ALL) | |
792 | break; | |
793 | ||
794 | if ((mp_bus_id_to_type[lbus] == MP_BUS_PCI) && | |
795 | !mp_irqs[i].mpc_irqtype && | |
796 | (bus == lbus) && | |
797 | (slot == ((mp_irqs[i].mpc_srcbusirq >> 2) & 0x1f))) { | |
798 | int irq = pin_2_irq(i,apic,mp_irqs[i].mpc_dstirq); | |
799 | ||
800 | if (!(apic || IO_APIC_IRQ(irq))) | |
801 | continue; | |
802 | ||
803 | if (pin == (mp_irqs[i].mpc_srcbusirq & 3)) | |
804 | return irq; | |
805 | /* | |
806 | * Use the first all-but-pin matching entry as a | |
807 | * best-guess fuzzy result for broken mptables. | |
808 | */ | |
809 | if (best_guess < 0) | |
810 | best_guess = irq; | |
811 | } | |
812 | } | |
813 | return best_guess; | |
814 | } | |
129f6946 | 815 | EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector); |
1da177e4 LT |
816 | |
817 | /* | |
818 | * This function currently is only a helper for the i386 smp boot process where | |
819 | * we need to reprogram the ioredtbls to cater for the cpus which have come online | |
820 | * so mask in all cases should simply be TARGET_CPUS | |
821 | */ | |
822 | void __init setup_ioapic_dest(void) | |
823 | { | |
824 | int pin, ioapic, irq, irq_entry; | |
825 | ||
826 | if (skip_ioapic_setup == 1) | |
827 | return; | |
828 | ||
829 | for (ioapic = 0; ioapic < nr_ioapics; ioapic++) { | |
830 | for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) { | |
831 | irq_entry = find_irq_entry(ioapic, pin, mp_INT); | |
832 | if (irq_entry == -1) | |
833 | continue; | |
834 | irq = pin_2_irq(irq_entry, ioapic, pin); | |
835 | set_ioapic_affinity_irq(irq, TARGET_CPUS); | |
836 | } | |
837 | ||
838 | } | |
839 | } | |
840 | ||
841 | /* | |
842 | * EISA Edge/Level control register, ELCR | |
843 | */ | |
844 | static int EISA_ELCR(unsigned int irq) | |
845 | { | |
846 | if (irq < 16) { | |
847 | unsigned int port = 0x4d0 + (irq >> 3); | |
848 | return (inb(port) >> (irq & 7)) & 1; | |
849 | } | |
850 | apic_printk(APIC_VERBOSE, KERN_INFO | |
851 | "Broken MPtable reports ISA irq %d\n", irq); | |
852 | return 0; | |
853 | } | |
854 | ||
855 | /* EISA interrupts are always polarity zero and can be edge or level | |
856 | * trigger depending on the ELCR value. If an interrupt is listed as | |
857 | * EISA conforming in the MP table, that means its trigger type must | |
858 | * be read in from the ELCR */ | |
859 | ||
860 | #define default_EISA_trigger(idx) (EISA_ELCR(mp_irqs[idx].mpc_srcbusirq)) | |
861 | #define default_EISA_polarity(idx) (0) | |
862 | ||
863 | /* ISA interrupts are always polarity zero edge triggered, | |
864 | * when listed as conforming in the MP table. */ | |
865 | ||
866 | #define default_ISA_trigger(idx) (0) | |
867 | #define default_ISA_polarity(idx) (0) | |
868 | ||
869 | /* PCI interrupts are always polarity one level triggered, | |
870 | * when listed as conforming in the MP table. */ | |
871 | ||
872 | #define default_PCI_trigger(idx) (1) | |
873 | #define default_PCI_polarity(idx) (1) | |
874 | ||
875 | /* MCA interrupts are always polarity zero level triggered, | |
876 | * when listed as conforming in the MP table. */ | |
877 | ||
878 | #define default_MCA_trigger(idx) (1) | |
879 | #define default_MCA_polarity(idx) (0) | |
880 | ||
881 | /* NEC98 interrupts are always polarity zero edge triggered, | |
882 | * when listed as conforming in the MP table. */ | |
883 | ||
884 | #define default_NEC98_trigger(idx) (0) | |
885 | #define default_NEC98_polarity(idx) (0) | |
886 | ||
887 | static int __init MPBIOS_polarity(int idx) | |
888 | { | |
889 | int bus = mp_irqs[idx].mpc_srcbus; | |
890 | int polarity; | |
891 | ||
892 | /* | |
893 | * Determine IRQ line polarity (high active or low active): | |
894 | */ | |
895 | switch (mp_irqs[idx].mpc_irqflag & 3) | |
896 | { | |
897 | case 0: /* conforms, ie. bus-type dependent polarity */ | |
898 | { | |
899 | switch (mp_bus_id_to_type[bus]) | |
900 | { | |
901 | case MP_BUS_ISA: /* ISA pin */ | |
902 | { | |
903 | polarity = default_ISA_polarity(idx); | |
904 | break; | |
905 | } | |
906 | case MP_BUS_EISA: /* EISA pin */ | |
907 | { | |
908 | polarity = default_EISA_polarity(idx); | |
909 | break; | |
910 | } | |
911 | case MP_BUS_PCI: /* PCI pin */ | |
912 | { | |
913 | polarity = default_PCI_polarity(idx); | |
914 | break; | |
915 | } | |
916 | case MP_BUS_MCA: /* MCA pin */ | |
917 | { | |
918 | polarity = default_MCA_polarity(idx); | |
919 | break; | |
920 | } | |
921 | case MP_BUS_NEC98: /* NEC 98 pin */ | |
922 | { | |
923 | polarity = default_NEC98_polarity(idx); | |
924 | break; | |
925 | } | |
926 | default: | |
927 | { | |
928 | printk(KERN_WARNING "broken BIOS!!\n"); | |
929 | polarity = 1; | |
930 | break; | |
931 | } | |
932 | } | |
933 | break; | |
934 | } | |
935 | case 1: /* high active */ | |
936 | { | |
937 | polarity = 0; | |
938 | break; | |
939 | } | |
940 | case 2: /* reserved */ | |
941 | { | |
942 | printk(KERN_WARNING "broken BIOS!!\n"); | |
943 | polarity = 1; | |
944 | break; | |
945 | } | |
946 | case 3: /* low active */ | |
947 | { | |
948 | polarity = 1; | |
949 | break; | |
950 | } | |
951 | default: /* invalid */ | |
952 | { | |
953 | printk(KERN_WARNING "broken BIOS!!\n"); | |
954 | polarity = 1; | |
955 | break; | |
956 | } | |
957 | } | |
958 | return polarity; | |
959 | } | |
960 | ||
961 | static int MPBIOS_trigger(int idx) | |
962 | { | |
963 | int bus = mp_irqs[idx].mpc_srcbus; | |
964 | int trigger; | |
965 | ||
966 | /* | |
967 | * Determine IRQ trigger mode (edge or level sensitive): | |
968 | */ | |
969 | switch ((mp_irqs[idx].mpc_irqflag>>2) & 3) | |
970 | { | |
971 | case 0: /* conforms, ie. bus-type dependent */ | |
972 | { | |
973 | switch (mp_bus_id_to_type[bus]) | |
974 | { | |
975 | case MP_BUS_ISA: /* ISA pin */ | |
976 | { | |
977 | trigger = default_ISA_trigger(idx); | |
978 | break; | |
979 | } | |
980 | case MP_BUS_EISA: /* EISA pin */ | |
981 | { | |
982 | trigger = default_EISA_trigger(idx); | |
983 | break; | |
984 | } | |
985 | case MP_BUS_PCI: /* PCI pin */ | |
986 | { | |
987 | trigger = default_PCI_trigger(idx); | |
988 | break; | |
989 | } | |
990 | case MP_BUS_MCA: /* MCA pin */ | |
991 | { | |
992 | trigger = default_MCA_trigger(idx); | |
993 | break; | |
994 | } | |
995 | case MP_BUS_NEC98: /* NEC 98 pin */ | |
996 | { | |
997 | trigger = default_NEC98_trigger(idx); | |
998 | break; | |
999 | } | |
1000 | default: | |
1001 | { | |
1002 | printk(KERN_WARNING "broken BIOS!!\n"); | |
1003 | trigger = 1; | |
1004 | break; | |
1005 | } | |
1006 | } | |
1007 | break; | |
1008 | } | |
1009 | case 1: /* edge */ | |
1010 | { | |
1011 | trigger = 0; | |
1012 | break; | |
1013 | } | |
1014 | case 2: /* reserved */ | |
1015 | { | |
1016 | printk(KERN_WARNING "broken BIOS!!\n"); | |
1017 | trigger = 1; | |
1018 | break; | |
1019 | } | |
1020 | case 3: /* level */ | |
1021 | { | |
1022 | trigger = 1; | |
1023 | break; | |
1024 | } | |
1025 | default: /* invalid */ | |
1026 | { | |
1027 | printk(KERN_WARNING "broken BIOS!!\n"); | |
1028 | trigger = 0; | |
1029 | break; | |
1030 | } | |
1031 | } | |
1032 | return trigger; | |
1033 | } | |
1034 | ||
1035 | static inline int irq_polarity(int idx) | |
1036 | { | |
1037 | return MPBIOS_polarity(idx); | |
1038 | } | |
1039 | ||
1040 | static inline int irq_trigger(int idx) | |
1041 | { | |
1042 | return MPBIOS_trigger(idx); | |
1043 | } | |
1044 | ||
1045 | static int pin_2_irq(int idx, int apic, int pin) | |
1046 | { | |
1047 | int irq, i; | |
1048 | int bus = mp_irqs[idx].mpc_srcbus; | |
1049 | ||
1050 | /* | |
1051 | * Debugging check, we are in big trouble if this message pops up! | |
1052 | */ | |
1053 | if (mp_irqs[idx].mpc_dstirq != pin) | |
1054 | printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n"); | |
1055 | ||
1056 | switch (mp_bus_id_to_type[bus]) | |
1057 | { | |
1058 | case MP_BUS_ISA: /* ISA pin */ | |
1059 | case MP_BUS_EISA: | |
1060 | case MP_BUS_MCA: | |
1061 | case MP_BUS_NEC98: | |
1062 | { | |
1063 | irq = mp_irqs[idx].mpc_srcbusirq; | |
1064 | break; | |
1065 | } | |
1066 | case MP_BUS_PCI: /* PCI pin */ | |
1067 | { | |
1068 | /* | |
1069 | * PCI IRQs are mapped in order | |
1070 | */ | |
1071 | i = irq = 0; | |
1072 | while (i < apic) | |
1073 | irq += nr_ioapic_registers[i++]; | |
1074 | irq += pin; | |
1075 | ||
1076 | /* | |
1077 | * For MPS mode, so far only needed by ES7000 platform | |
1078 | */ | |
1079 | if (ioapic_renumber_irq) | |
1080 | irq = ioapic_renumber_irq(apic, irq); | |
1081 | ||
1082 | break; | |
1083 | } | |
1084 | default: | |
1085 | { | |
1086 | printk(KERN_ERR "unknown bus type %d.\n",bus); | |
1087 | irq = 0; | |
1088 | break; | |
1089 | } | |
1090 | } | |
1091 | ||
1092 | /* | |
1093 | * PCI IRQ command line redirection. Yes, limits are hardcoded. | |
1094 | */ | |
1095 | if ((pin >= 16) && (pin <= 23)) { | |
1096 | if (pirq_entries[pin-16] != -1) { | |
1097 | if (!pirq_entries[pin-16]) { | |
1098 | apic_printk(APIC_VERBOSE, KERN_DEBUG | |
1099 | "disabling PIRQ%d\n", pin-16); | |
1100 | } else { | |
1101 | irq = pirq_entries[pin-16]; | |
1102 | apic_printk(APIC_VERBOSE, KERN_DEBUG | |
1103 | "using PIRQ%d -> IRQ %d\n", | |
1104 | pin-16, irq); | |
1105 | } | |
1106 | } | |
1107 | } | |
1108 | return irq; | |
1109 | } | |
1110 | ||
1111 | static inline int IO_APIC_irq_trigger(int irq) | |
1112 | { | |
1113 | int apic, idx, pin; | |
1114 | ||
1115 | for (apic = 0; apic < nr_ioapics; apic++) { | |
1116 | for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) { | |
1117 | idx = find_irq_entry(apic,pin,mp_INT); | |
1118 | if ((idx != -1) && (irq == pin_2_irq(idx,apic,pin))) | |
1119 | return irq_trigger(idx); | |
1120 | } | |
1121 | } | |
1122 | /* | |
1123 | * nonexistent IRQs are edge default | |
1124 | */ | |
1125 | return 0; | |
1126 | } | |
1127 | ||
1128 | /* irq_vectors is indexed by the sum of all RTEs in all I/O APICs. */ | |
1129 | u8 irq_vector[NR_IRQ_VECTORS] = { FIRST_DEVICE_VECTOR , 0 }; | |
1130 | ||
1131 | int assign_irq_vector(int irq) | |
1132 | { | |
1133 | static int current_vector = FIRST_DEVICE_VECTOR, offset = 0; | |
1134 | ||
1135 | BUG_ON(irq >= NR_IRQ_VECTORS); | |
1136 | if (irq != AUTO_ASSIGN && IO_APIC_VECTOR(irq) > 0) | |
1137 | return IO_APIC_VECTOR(irq); | |
1138 | next: | |
1139 | current_vector += 8; | |
1140 | if (current_vector == SYSCALL_VECTOR) | |
1141 | goto next; | |
1142 | ||
1143 | if (current_vector >= FIRST_SYSTEM_VECTOR) { | |
1144 | offset++; | |
1145 | if (!(offset%8)) | |
1146 | return -ENOSPC; | |
1147 | current_vector = FIRST_DEVICE_VECTOR + offset; | |
1148 | } | |
1149 | ||
1150 | vector_irq[current_vector] = irq; | |
1151 | if (irq != AUTO_ASSIGN) | |
1152 | IO_APIC_VECTOR(irq) = current_vector; | |
1153 | ||
1154 | return current_vector; | |
1155 | } | |
1156 | ||
1157 | static struct hw_interrupt_type ioapic_level_type; | |
1158 | static struct hw_interrupt_type ioapic_edge_type; | |
1159 | ||
1160 | #define IOAPIC_AUTO -1 | |
1161 | #define IOAPIC_EDGE 0 | |
1162 | #define IOAPIC_LEVEL 1 | |
1163 | ||
1164 | static inline void ioapic_register_intr(int irq, int vector, unsigned long trigger) | |
1165 | { | |
1166 | if (use_pci_vector() && !platform_legacy_irq(irq)) { | |
1167 | if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) || | |
1168 | trigger == IOAPIC_LEVEL) | |
1169 | irq_desc[vector].handler = &ioapic_level_type; | |
1170 | else | |
1171 | irq_desc[vector].handler = &ioapic_edge_type; | |
1172 | set_intr_gate(vector, interrupt[vector]); | |
1173 | } else { | |
1174 | if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) || | |
1175 | trigger == IOAPIC_LEVEL) | |
1176 | irq_desc[irq].handler = &ioapic_level_type; | |
1177 | else | |
1178 | irq_desc[irq].handler = &ioapic_edge_type; | |
1179 | set_intr_gate(vector, interrupt[irq]); | |
1180 | } | |
1181 | } | |
1182 | ||
1183 | static void __init setup_IO_APIC_irqs(void) | |
1184 | { | |
1185 | struct IO_APIC_route_entry entry; | |
1186 | int apic, pin, idx, irq, first_notcon = 1, vector; | |
1187 | unsigned long flags; | |
1188 | ||
1189 | apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n"); | |
1190 | ||
1191 | for (apic = 0; apic < nr_ioapics; apic++) { | |
1192 | for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) { | |
1193 | ||
1194 | /* | |
1195 | * add it to the IO-APIC irq-routing table: | |
1196 | */ | |
1197 | memset(&entry,0,sizeof(entry)); | |
1198 | ||
1199 | entry.delivery_mode = INT_DELIVERY_MODE; | |
1200 | entry.dest_mode = INT_DEST_MODE; | |
1201 | entry.mask = 0; /* enable IRQ */ | |
1202 | entry.dest.logical.logical_dest = | |
1203 | cpu_mask_to_apicid(TARGET_CPUS); | |
1204 | ||
1205 | idx = find_irq_entry(apic,pin,mp_INT); | |
1206 | if (idx == -1) { | |
1207 | if (first_notcon) { | |
1208 | apic_printk(APIC_VERBOSE, KERN_DEBUG | |
1209 | " IO-APIC (apicid-pin) %d-%d", | |
1210 | mp_ioapics[apic].mpc_apicid, | |
1211 | pin); | |
1212 | first_notcon = 0; | |
1213 | } else | |
1214 | apic_printk(APIC_VERBOSE, ", %d-%d", | |
1215 | mp_ioapics[apic].mpc_apicid, pin); | |
1216 | continue; | |
1217 | } | |
1218 | ||
1219 | entry.trigger = irq_trigger(idx); | |
1220 | entry.polarity = irq_polarity(idx); | |
1221 | ||
1222 | if (irq_trigger(idx)) { | |
1223 | entry.trigger = 1; | |
1224 | entry.mask = 1; | |
1225 | } | |
1226 | ||
1227 | irq = pin_2_irq(idx, apic, pin); | |
1228 | /* | |
1229 | * skip adding the timer int on secondary nodes, which causes | |
1230 | * a small but painful rift in the time-space continuum | |
1231 | */ | |
1232 | if (multi_timer_check(apic, irq)) | |
1233 | continue; | |
1234 | else | |
1235 | add_pin_to_irq(irq, apic, pin); | |
1236 | ||
1237 | if (!apic && !IO_APIC_IRQ(irq)) | |
1238 | continue; | |
1239 | ||
1240 | if (IO_APIC_IRQ(irq)) { | |
1241 | vector = assign_irq_vector(irq); | |
1242 | entry.vector = vector; | |
1243 | ioapic_register_intr(irq, vector, IOAPIC_AUTO); | |
1244 | ||
1245 | if (!apic && (irq < 16)) | |
1246 | disable_8259A_irq(irq); | |
1247 | } | |
1248 | spin_lock_irqsave(&ioapic_lock, flags); | |
1249 | io_apic_write(apic, 0x11+2*pin, *(((int *)&entry)+1)); | |
1250 | io_apic_write(apic, 0x10+2*pin, *(((int *)&entry)+0)); | |
1251 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
1252 | } | |
1253 | } | |
1254 | ||
1255 | if (!first_notcon) | |
1256 | apic_printk(APIC_VERBOSE, " not connected.\n"); | |
1257 | } | |
1258 | ||
1259 | /* | |
1260 | * Set up the 8259A-master output pin: | |
1261 | */ | |
1262 | static void __init setup_ExtINT_IRQ0_pin(unsigned int pin, int vector) | |
1263 | { | |
1264 | struct IO_APIC_route_entry entry; | |
1265 | unsigned long flags; | |
1266 | ||
1267 | memset(&entry,0,sizeof(entry)); | |
1268 | ||
1269 | disable_8259A_irq(0); | |
1270 | ||
1271 | /* mask LVT0 */ | |
1272 | apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT); | |
1273 | ||
1274 | /* | |
1275 | * We use logical delivery to get the timer IRQ | |
1276 | * to the first CPU. | |
1277 | */ | |
1278 | entry.dest_mode = INT_DEST_MODE; | |
1279 | entry.mask = 0; /* unmask IRQ now */ | |
1280 | entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS); | |
1281 | entry.delivery_mode = INT_DELIVERY_MODE; | |
1282 | entry.polarity = 0; | |
1283 | entry.trigger = 0; | |
1284 | entry.vector = vector; | |
1285 | ||
1286 | /* | |
1287 | * The timer IRQ doesn't have to know that behind the | |
1288 | * scene we have a 8259A-master in AEOI mode ... | |
1289 | */ | |
1290 | irq_desc[0].handler = &ioapic_edge_type; | |
1291 | ||
1292 | /* | |
1293 | * Add it to the IO-APIC irq-routing table: | |
1294 | */ | |
1295 | spin_lock_irqsave(&ioapic_lock, flags); | |
1296 | io_apic_write(0, 0x11+2*pin, *(((int *)&entry)+1)); | |
1297 | io_apic_write(0, 0x10+2*pin, *(((int *)&entry)+0)); | |
1298 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
1299 | ||
1300 | enable_8259A_irq(0); | |
1301 | } | |
1302 | ||
1303 | static inline void UNEXPECTED_IO_APIC(void) | |
1304 | { | |
1305 | } | |
1306 | ||
1307 | void __init print_IO_APIC(void) | |
1308 | { | |
1309 | int apic, i; | |
1310 | union IO_APIC_reg_00 reg_00; | |
1311 | union IO_APIC_reg_01 reg_01; | |
1312 | union IO_APIC_reg_02 reg_02; | |
1313 | union IO_APIC_reg_03 reg_03; | |
1314 | unsigned long flags; | |
1315 | ||
1316 | if (apic_verbosity == APIC_QUIET) | |
1317 | return; | |
1318 | ||
1319 | printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries); | |
1320 | for (i = 0; i < nr_ioapics; i++) | |
1321 | printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n", | |
1322 | mp_ioapics[i].mpc_apicid, nr_ioapic_registers[i]); | |
1323 | ||
1324 | /* | |
1325 | * We are a bit conservative about what we expect. We have to | |
1326 | * know about every hardware change ASAP. | |
1327 | */ | |
1328 | printk(KERN_INFO "testing the IO APIC.......................\n"); | |
1329 | ||
1330 | for (apic = 0; apic < nr_ioapics; apic++) { | |
1331 | ||
1332 | spin_lock_irqsave(&ioapic_lock, flags); | |
1333 | reg_00.raw = io_apic_read(apic, 0); | |
1334 | reg_01.raw = io_apic_read(apic, 1); | |
1335 | if (reg_01.bits.version >= 0x10) | |
1336 | reg_02.raw = io_apic_read(apic, 2); | |
1337 | if (reg_01.bits.version >= 0x20) | |
1338 | reg_03.raw = io_apic_read(apic, 3); | |
1339 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
1340 | ||
1341 | printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].mpc_apicid); | |
1342 | printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw); | |
1343 | printk(KERN_DEBUG "....... : physical APIC id: %02X\n", reg_00.bits.ID); | |
1344 | printk(KERN_DEBUG "....... : Delivery Type: %X\n", reg_00.bits.delivery_type); | |
1345 | printk(KERN_DEBUG "....... : LTS : %X\n", reg_00.bits.LTS); | |
1346 | if (reg_00.bits.ID >= get_physical_broadcast()) | |
1347 | UNEXPECTED_IO_APIC(); | |
1348 | if (reg_00.bits.__reserved_1 || reg_00.bits.__reserved_2) | |
1349 | UNEXPECTED_IO_APIC(); | |
1350 | ||
1351 | printk(KERN_DEBUG ".... register #01: %08X\n", reg_01.raw); | |
1352 | printk(KERN_DEBUG "....... : max redirection entries: %04X\n", reg_01.bits.entries); | |
1353 | if ( (reg_01.bits.entries != 0x0f) && /* older (Neptune) boards */ | |
1354 | (reg_01.bits.entries != 0x17) && /* typical ISA+PCI boards */ | |
1355 | (reg_01.bits.entries != 0x1b) && /* Compaq Proliant boards */ | |
1356 | (reg_01.bits.entries != 0x1f) && /* dual Xeon boards */ | |
1357 | (reg_01.bits.entries != 0x22) && /* bigger Xeon boards */ | |
1358 | (reg_01.bits.entries != 0x2E) && | |
1359 | (reg_01.bits.entries != 0x3F) | |
1360 | ) | |
1361 | UNEXPECTED_IO_APIC(); | |
1362 | ||
1363 | printk(KERN_DEBUG "....... : PRQ implemented: %X\n", reg_01.bits.PRQ); | |
1364 | printk(KERN_DEBUG "....... : IO APIC version: %04X\n", reg_01.bits.version); | |
1365 | if ( (reg_01.bits.version != 0x01) && /* 82489DX IO-APICs */ | |
1366 | (reg_01.bits.version != 0x10) && /* oldest IO-APICs */ | |
1367 | (reg_01.bits.version != 0x11) && /* Pentium/Pro IO-APICs */ | |
1368 | (reg_01.bits.version != 0x13) && /* Xeon IO-APICs */ | |
1369 | (reg_01.bits.version != 0x20) /* Intel P64H (82806 AA) */ | |
1370 | ) | |
1371 | UNEXPECTED_IO_APIC(); | |
1372 | if (reg_01.bits.__reserved_1 || reg_01.bits.__reserved_2) | |
1373 | UNEXPECTED_IO_APIC(); | |
1374 | ||
1375 | /* | |
1376 | * Some Intel chipsets with IO APIC VERSION of 0x1? don't have reg_02, | |
1377 | * but the value of reg_02 is read as the previous read register | |
1378 | * value, so ignore it if reg_02 == reg_01. | |
1379 | */ | |
1380 | if (reg_01.bits.version >= 0x10 && reg_02.raw != reg_01.raw) { | |
1381 | printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw); | |
1382 | printk(KERN_DEBUG "....... : arbitration: %02X\n", reg_02.bits.arbitration); | |
1383 | if (reg_02.bits.__reserved_1 || reg_02.bits.__reserved_2) | |
1384 | UNEXPECTED_IO_APIC(); | |
1385 | } | |
1386 | ||
1387 | /* | |
1388 | * Some Intel chipsets with IO APIC VERSION of 0x2? don't have reg_02 | |
1389 | * or reg_03, but the value of reg_0[23] is read as the previous read | |
1390 | * register value, so ignore it if reg_03 == reg_0[12]. | |
1391 | */ | |
1392 | if (reg_01.bits.version >= 0x20 && reg_03.raw != reg_02.raw && | |
1393 | reg_03.raw != reg_01.raw) { | |
1394 | printk(KERN_DEBUG ".... register #03: %08X\n", reg_03.raw); | |
1395 | printk(KERN_DEBUG "....... : Boot DT : %X\n", reg_03.bits.boot_DT); | |
1396 | if (reg_03.bits.__reserved_1) | |
1397 | UNEXPECTED_IO_APIC(); | |
1398 | } | |
1399 | ||
1400 | printk(KERN_DEBUG ".... IRQ redirection table:\n"); | |
1401 | ||
1402 | printk(KERN_DEBUG " NR Log Phy Mask Trig IRR Pol" | |
1403 | " Stat Dest Deli Vect: \n"); | |
1404 | ||
1405 | for (i = 0; i <= reg_01.bits.entries; i++) { | |
1406 | struct IO_APIC_route_entry entry; | |
1407 | ||
1408 | spin_lock_irqsave(&ioapic_lock, flags); | |
1409 | *(((int *)&entry)+0) = io_apic_read(apic, 0x10+i*2); | |
1410 | *(((int *)&entry)+1) = io_apic_read(apic, 0x11+i*2); | |
1411 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
1412 | ||
1413 | printk(KERN_DEBUG " %02x %03X %02X ", | |
1414 | i, | |
1415 | entry.dest.logical.logical_dest, | |
1416 | entry.dest.physical.physical_dest | |
1417 | ); | |
1418 | ||
1419 | printk("%1d %1d %1d %1d %1d %1d %1d %02X\n", | |
1420 | entry.mask, | |
1421 | entry.trigger, | |
1422 | entry.irr, | |
1423 | entry.polarity, | |
1424 | entry.delivery_status, | |
1425 | entry.dest_mode, | |
1426 | entry.delivery_mode, | |
1427 | entry.vector | |
1428 | ); | |
1429 | } | |
1430 | } | |
1431 | if (use_pci_vector()) | |
1432 | printk(KERN_INFO "Using vector-based indexing\n"); | |
1433 | printk(KERN_DEBUG "IRQ to pin mappings:\n"); | |
1434 | for (i = 0; i < NR_IRQS; i++) { | |
1435 | struct irq_pin_list *entry = irq_2_pin + i; | |
1436 | if (entry->pin < 0) | |
1437 | continue; | |
1438 | if (use_pci_vector() && !platform_legacy_irq(i)) | |
1439 | printk(KERN_DEBUG "IRQ%d ", IO_APIC_VECTOR(i)); | |
1440 | else | |
1441 | printk(KERN_DEBUG "IRQ%d ", i); | |
1442 | for (;;) { | |
1443 | printk("-> %d:%d", entry->apic, entry->pin); | |
1444 | if (!entry->next) | |
1445 | break; | |
1446 | entry = irq_2_pin + entry->next; | |
1447 | } | |
1448 | printk("\n"); | |
1449 | } | |
1450 | ||
1451 | printk(KERN_INFO ".................................... done.\n"); | |
1452 | ||
1453 | return; | |
1454 | } | |
1455 | ||
1456 | #if 0 | |
1457 | ||
1458 | static void print_APIC_bitfield (int base) | |
1459 | { | |
1460 | unsigned int v; | |
1461 | int i, j; | |
1462 | ||
1463 | if (apic_verbosity == APIC_QUIET) | |
1464 | return; | |
1465 | ||
1466 | printk(KERN_DEBUG "0123456789abcdef0123456789abcdef\n" KERN_DEBUG); | |
1467 | for (i = 0; i < 8; i++) { | |
1468 | v = apic_read(base + i*0x10); | |
1469 | for (j = 0; j < 32; j++) { | |
1470 | if (v & (1<<j)) | |
1471 | printk("1"); | |
1472 | else | |
1473 | printk("0"); | |
1474 | } | |
1475 | printk("\n"); | |
1476 | } | |
1477 | } | |
1478 | ||
1479 | void /*__init*/ print_local_APIC(void * dummy) | |
1480 | { | |
1481 | unsigned int v, ver, maxlvt; | |
1482 | ||
1483 | if (apic_verbosity == APIC_QUIET) | |
1484 | return; | |
1485 | ||
1486 | printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n", | |
1487 | smp_processor_id(), hard_smp_processor_id()); | |
1488 | v = apic_read(APIC_ID); | |
1489 | printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v, GET_APIC_ID(v)); | |
1490 | v = apic_read(APIC_LVR); | |
1491 | printk(KERN_INFO "... APIC VERSION: %08x\n", v); | |
1492 | ver = GET_APIC_VERSION(v); | |
1493 | maxlvt = get_maxlvt(); | |
1494 | ||
1495 | v = apic_read(APIC_TASKPRI); | |
1496 | printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK); | |
1497 | ||
1498 | if (APIC_INTEGRATED(ver)) { /* !82489DX */ | |
1499 | v = apic_read(APIC_ARBPRI); | |
1500 | printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v, | |
1501 | v & APIC_ARBPRI_MASK); | |
1502 | v = apic_read(APIC_PROCPRI); | |
1503 | printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v); | |
1504 | } | |
1505 | ||
1506 | v = apic_read(APIC_EOI); | |
1507 | printk(KERN_DEBUG "... APIC EOI: %08x\n", v); | |
1508 | v = apic_read(APIC_RRR); | |
1509 | printk(KERN_DEBUG "... APIC RRR: %08x\n", v); | |
1510 | v = apic_read(APIC_LDR); | |
1511 | printk(KERN_DEBUG "... APIC LDR: %08x\n", v); | |
1512 | v = apic_read(APIC_DFR); | |
1513 | printk(KERN_DEBUG "... APIC DFR: %08x\n", v); | |
1514 | v = apic_read(APIC_SPIV); | |
1515 | printk(KERN_DEBUG "... APIC SPIV: %08x\n", v); | |
1516 | ||
1517 | printk(KERN_DEBUG "... APIC ISR field:\n"); | |
1518 | print_APIC_bitfield(APIC_ISR); | |
1519 | printk(KERN_DEBUG "... APIC TMR field:\n"); | |
1520 | print_APIC_bitfield(APIC_TMR); | |
1521 | printk(KERN_DEBUG "... APIC IRR field:\n"); | |
1522 | print_APIC_bitfield(APIC_IRR); | |
1523 | ||
1524 | if (APIC_INTEGRATED(ver)) { /* !82489DX */ | |
1525 | if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */ | |
1526 | apic_write(APIC_ESR, 0); | |
1527 | v = apic_read(APIC_ESR); | |
1528 | printk(KERN_DEBUG "... APIC ESR: %08x\n", v); | |
1529 | } | |
1530 | ||
1531 | v = apic_read(APIC_ICR); | |
1532 | printk(KERN_DEBUG "... APIC ICR: %08x\n", v); | |
1533 | v = apic_read(APIC_ICR2); | |
1534 | printk(KERN_DEBUG "... APIC ICR2: %08x\n", v); | |
1535 | ||
1536 | v = apic_read(APIC_LVTT); | |
1537 | printk(KERN_DEBUG "... APIC LVTT: %08x\n", v); | |
1538 | ||
1539 | if (maxlvt > 3) { /* PC is LVT#4. */ | |
1540 | v = apic_read(APIC_LVTPC); | |
1541 | printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v); | |
1542 | } | |
1543 | v = apic_read(APIC_LVT0); | |
1544 | printk(KERN_DEBUG "... APIC LVT0: %08x\n", v); | |
1545 | v = apic_read(APIC_LVT1); | |
1546 | printk(KERN_DEBUG "... APIC LVT1: %08x\n", v); | |
1547 | ||
1548 | if (maxlvt > 2) { /* ERR is LVT#3. */ | |
1549 | v = apic_read(APIC_LVTERR); | |
1550 | printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v); | |
1551 | } | |
1552 | ||
1553 | v = apic_read(APIC_TMICT); | |
1554 | printk(KERN_DEBUG "... APIC TMICT: %08x\n", v); | |
1555 | v = apic_read(APIC_TMCCT); | |
1556 | printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v); | |
1557 | v = apic_read(APIC_TDCR); | |
1558 | printk(KERN_DEBUG "... APIC TDCR: %08x\n", v); | |
1559 | printk("\n"); | |
1560 | } | |
1561 | ||
1562 | void print_all_local_APICs (void) | |
1563 | { | |
1564 | on_each_cpu(print_local_APIC, NULL, 1, 1); | |
1565 | } | |
1566 | ||
1567 | void /*__init*/ print_PIC(void) | |
1568 | { | |
1569 | extern spinlock_t i8259A_lock; | |
1570 | unsigned int v; | |
1571 | unsigned long flags; | |
1572 | ||
1573 | if (apic_verbosity == APIC_QUIET) | |
1574 | return; | |
1575 | ||
1576 | printk(KERN_DEBUG "\nprinting PIC contents\n"); | |
1577 | ||
1578 | spin_lock_irqsave(&i8259A_lock, flags); | |
1579 | ||
1580 | v = inb(0xa1) << 8 | inb(0x21); | |
1581 | printk(KERN_DEBUG "... PIC IMR: %04x\n", v); | |
1582 | ||
1583 | v = inb(0xa0) << 8 | inb(0x20); | |
1584 | printk(KERN_DEBUG "... PIC IRR: %04x\n", v); | |
1585 | ||
1586 | outb(0x0b,0xa0); | |
1587 | outb(0x0b,0x20); | |
1588 | v = inb(0xa0) << 8 | inb(0x20); | |
1589 | outb(0x0a,0xa0); | |
1590 | outb(0x0a,0x20); | |
1591 | ||
1592 | spin_unlock_irqrestore(&i8259A_lock, flags); | |
1593 | ||
1594 | printk(KERN_DEBUG "... PIC ISR: %04x\n", v); | |
1595 | ||
1596 | v = inb(0x4d1) << 8 | inb(0x4d0); | |
1597 | printk(KERN_DEBUG "... PIC ELCR: %04x\n", v); | |
1598 | } | |
1599 | ||
1600 | #endif /* 0 */ | |
1601 | ||
1602 | static void __init enable_IO_APIC(void) | |
1603 | { | |
1604 | union IO_APIC_reg_01 reg_01; | |
1605 | int i; | |
1606 | unsigned long flags; | |
1607 | ||
1608 | for (i = 0; i < PIN_MAP_SIZE; i++) { | |
1609 | irq_2_pin[i].pin = -1; | |
1610 | irq_2_pin[i].next = 0; | |
1611 | } | |
1612 | if (!pirqs_enabled) | |
1613 | for (i = 0; i < MAX_PIRQS; i++) | |
1614 | pirq_entries[i] = -1; | |
1615 | ||
1616 | /* | |
1617 | * The number of IO-APIC IRQ registers (== #pins): | |
1618 | */ | |
1619 | for (i = 0; i < nr_ioapics; i++) { | |
1620 | spin_lock_irqsave(&ioapic_lock, flags); | |
1621 | reg_01.raw = io_apic_read(i, 1); | |
1622 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
1623 | nr_ioapic_registers[i] = reg_01.bits.entries+1; | |
1624 | } | |
1625 | ||
1626 | /* | |
1627 | * Do not trust the IO-APIC being empty at bootup | |
1628 | */ | |
1629 | clear_IO_APIC(); | |
1630 | } | |
1631 | ||
1632 | /* | |
1633 | * Not an __init, needed by the reboot code | |
1634 | */ | |
1635 | void disable_IO_APIC(void) | |
1636 | { | |
650927ef | 1637 | int pin; |
1da177e4 LT |
1638 | /* |
1639 | * Clear the IO-APIC before rebooting: | |
1640 | */ | |
1641 | clear_IO_APIC(); | |
1642 | ||
650927ef EB |
1643 | /* |
1644 | * If the i82559 is routed through an IOAPIC | |
1645 | * Put that IOAPIC in virtual wire mode | |
1646 | * so legacy interrups can be delivered. | |
1647 | */ | |
1648 | pin = find_isa_irq_pin(0, mp_ExtINT); | |
1649 | if (pin != -1) { | |
1650 | struct IO_APIC_route_entry entry; | |
1651 | unsigned long flags; | |
1652 | ||
1653 | memset(&entry, 0, sizeof(entry)); | |
1654 | entry.mask = 0; /* Enabled */ | |
1655 | entry.trigger = 0; /* Edge */ | |
1656 | entry.irr = 0; | |
1657 | entry.polarity = 0; /* High */ | |
1658 | entry.delivery_status = 0; | |
1659 | entry.dest_mode = 0; /* Physical */ | |
1660 | entry.delivery_mode = 7; /* ExtInt */ | |
1661 | entry.vector = 0; | |
1662 | entry.dest.physical.physical_dest = 0; | |
1663 | ||
1664 | ||
1665 | /* | |
1666 | * Add it to the IO-APIC irq-routing table: | |
1667 | */ | |
1668 | spin_lock_irqsave(&ioapic_lock, flags); | |
1669 | io_apic_write(0, 0x11+2*pin, *(((int *)&entry)+1)); | |
1670 | io_apic_write(0, 0x10+2*pin, *(((int *)&entry)+0)); | |
1671 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
1672 | } | |
1673 | disconnect_bsp_APIC(pin != -1); | |
1da177e4 LT |
1674 | } |
1675 | ||
1676 | /* | |
1677 | * function to set the IO-APIC physical IDs based on the | |
1678 | * values stored in the MPC table. | |
1679 | * | |
1680 | * by Matt Domsch <Matt_Domsch@dell.com> Tue Dec 21 12:25:05 CST 1999 | |
1681 | */ | |
1682 | ||
1683 | #ifndef CONFIG_X86_NUMAQ | |
1684 | static void __init setup_ioapic_ids_from_mpc(void) | |
1685 | { | |
1686 | union IO_APIC_reg_00 reg_00; | |
1687 | physid_mask_t phys_id_present_map; | |
1688 | int apic; | |
1689 | int i; | |
1690 | unsigned char old_id; | |
1691 | unsigned long flags; | |
1692 | ||
ca05fea6 NP |
1693 | /* |
1694 | * Don't check I/O APIC IDs for xAPIC systems. They have | |
1695 | * no meaning without the serial APIC bus. | |
1696 | */ | |
1697 | if (!(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && boot_cpu_data.x86 < 15)) | |
1698 | return; | |
1da177e4 LT |
1699 | /* |
1700 | * This is broken; anything with a real cpu count has to | |
1701 | * circumvent this idiocy regardless. | |
1702 | */ | |
1703 | phys_id_present_map = ioapic_phys_id_map(phys_cpu_present_map); | |
1704 | ||
1705 | /* | |
1706 | * Set the IOAPIC ID to the value stored in the MPC table. | |
1707 | */ | |
1708 | for (apic = 0; apic < nr_ioapics; apic++) { | |
1709 | ||
1710 | /* Read the register 0 value */ | |
1711 | spin_lock_irqsave(&ioapic_lock, flags); | |
1712 | reg_00.raw = io_apic_read(apic, 0); | |
1713 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
1714 | ||
1715 | old_id = mp_ioapics[apic].mpc_apicid; | |
1716 | ||
1717 | if (mp_ioapics[apic].mpc_apicid >= get_physical_broadcast()) { | |
1718 | printk(KERN_ERR "BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n", | |
1719 | apic, mp_ioapics[apic].mpc_apicid); | |
1720 | printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n", | |
1721 | reg_00.bits.ID); | |
1722 | mp_ioapics[apic].mpc_apicid = reg_00.bits.ID; | |
1723 | } | |
1724 | ||
1da177e4 LT |
1725 | /* |
1726 | * Sanity check, is the ID really free? Every APIC in a | |
1727 | * system must have a unique ID or we get lots of nice | |
1728 | * 'stuck on smp_invalidate_needed IPI wait' messages. | |
1729 | */ | |
1730 | if (check_apicid_used(phys_id_present_map, | |
1731 | mp_ioapics[apic].mpc_apicid)) { | |
1732 | printk(KERN_ERR "BIOS bug, IO-APIC#%d ID %d is already used!...\n", | |
1733 | apic, mp_ioapics[apic].mpc_apicid); | |
1734 | for (i = 0; i < get_physical_broadcast(); i++) | |
1735 | if (!physid_isset(i, phys_id_present_map)) | |
1736 | break; | |
1737 | if (i >= get_physical_broadcast()) | |
1738 | panic("Max APIC ID exceeded!\n"); | |
1739 | printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n", | |
1740 | i); | |
1741 | physid_set(i, phys_id_present_map); | |
1742 | mp_ioapics[apic].mpc_apicid = i; | |
1743 | } else { | |
1744 | physid_mask_t tmp; | |
1745 | tmp = apicid_to_cpu_present(mp_ioapics[apic].mpc_apicid); | |
1746 | apic_printk(APIC_VERBOSE, "Setting %d in the " | |
1747 | "phys_id_present_map\n", | |
1748 | mp_ioapics[apic].mpc_apicid); | |
1749 | physids_or(phys_id_present_map, phys_id_present_map, tmp); | |
1750 | } | |
1751 | ||
1752 | ||
1753 | /* | |
1754 | * We need to adjust the IRQ routing table | |
1755 | * if the ID changed. | |
1756 | */ | |
1757 | if (old_id != mp_ioapics[apic].mpc_apicid) | |
1758 | for (i = 0; i < mp_irq_entries; i++) | |
1759 | if (mp_irqs[i].mpc_dstapic == old_id) | |
1760 | mp_irqs[i].mpc_dstapic | |
1761 | = mp_ioapics[apic].mpc_apicid; | |
1762 | ||
1763 | /* | |
1764 | * Read the right value from the MPC table and | |
1765 | * write it into the ID register. | |
1766 | */ | |
1767 | apic_printk(APIC_VERBOSE, KERN_INFO | |
1768 | "...changing IO-APIC physical APIC ID to %d ...", | |
1769 | mp_ioapics[apic].mpc_apicid); | |
1770 | ||
1771 | reg_00.bits.ID = mp_ioapics[apic].mpc_apicid; | |
1772 | spin_lock_irqsave(&ioapic_lock, flags); | |
1773 | io_apic_write(apic, 0, reg_00.raw); | |
1774 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
1775 | ||
1776 | /* | |
1777 | * Sanity check | |
1778 | */ | |
1779 | spin_lock_irqsave(&ioapic_lock, flags); | |
1780 | reg_00.raw = io_apic_read(apic, 0); | |
1781 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
1782 | if (reg_00.bits.ID != mp_ioapics[apic].mpc_apicid) | |
1783 | printk("could not set ID!\n"); | |
1784 | else | |
1785 | apic_printk(APIC_VERBOSE, " ok.\n"); | |
1786 | } | |
1787 | } | |
1788 | #else | |
1789 | static void __init setup_ioapic_ids_from_mpc(void) { } | |
1790 | #endif | |
1791 | ||
1792 | /* | |
1793 | * There is a nasty bug in some older SMP boards, their mptable lies | |
1794 | * about the timer IRQ. We do the following to work around the situation: | |
1795 | * | |
1796 | * - timer IRQ defaults to IO-APIC IRQ | |
1797 | * - if this function detects that timer IRQs are defunct, then we fall | |
1798 | * back to ISA timer IRQs | |
1799 | */ | |
1800 | static int __init timer_irq_works(void) | |
1801 | { | |
1802 | unsigned long t1 = jiffies; | |
1803 | ||
1804 | local_irq_enable(); | |
1805 | /* Let ten ticks pass... */ | |
1806 | mdelay((10 * 1000) / HZ); | |
1807 | ||
1808 | /* | |
1809 | * Expect a few ticks at least, to be sure some possible | |
1810 | * glue logic does not lock up after one or two first | |
1811 | * ticks in a non-ExtINT mode. Also the local APIC | |
1812 | * might have cached one ExtINT interrupt. Finally, at | |
1813 | * least one tick may be lost due to delays. | |
1814 | */ | |
1815 | if (jiffies - t1 > 4) | |
1816 | return 1; | |
1817 | ||
1818 | return 0; | |
1819 | } | |
1820 | ||
1821 | /* | |
1822 | * In the SMP+IOAPIC case it might happen that there are an unspecified | |
1823 | * number of pending IRQ events unhandled. These cases are very rare, | |
1824 | * so we 'resend' these IRQs via IPIs, to the same CPU. It's much | |
1825 | * better to do it this way as thus we do not have to be aware of | |
1826 | * 'pending' interrupts in the IRQ path, except at this point. | |
1827 | */ | |
1828 | /* | |
1829 | * Edge triggered needs to resend any interrupt | |
1830 | * that was delayed but this is now handled in the device | |
1831 | * independent code. | |
1832 | */ | |
1833 | ||
1834 | /* | |
1835 | * Starting up a edge-triggered IO-APIC interrupt is | |
1836 | * nasty - we need to make sure that we get the edge. | |
1837 | * If it is already asserted for some reason, we need | |
1838 | * return 1 to indicate that is was pending. | |
1839 | * | |
1840 | * This is not complete - we should be able to fake | |
1841 | * an edge even if it isn't on the 8259A... | |
1842 | */ | |
1843 | static unsigned int startup_edge_ioapic_irq(unsigned int irq) | |
1844 | { | |
1845 | int was_pending = 0; | |
1846 | unsigned long flags; | |
1847 | ||
1848 | spin_lock_irqsave(&ioapic_lock, flags); | |
1849 | if (irq < 16) { | |
1850 | disable_8259A_irq(irq); | |
1851 | if (i8259A_irq_pending(irq)) | |
1852 | was_pending = 1; | |
1853 | } | |
1854 | __unmask_IO_APIC_irq(irq); | |
1855 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
1856 | ||
1857 | return was_pending; | |
1858 | } | |
1859 | ||
1860 | /* | |
1861 | * Once we have recorded IRQ_PENDING already, we can mask the | |
1862 | * interrupt for real. This prevents IRQ storms from unhandled | |
1863 | * devices. | |
1864 | */ | |
1865 | static void ack_edge_ioapic_irq(unsigned int irq) | |
1866 | { | |
1867 | move_irq(irq); | |
1868 | if ((irq_desc[irq].status & (IRQ_PENDING | IRQ_DISABLED)) | |
1869 | == (IRQ_PENDING | IRQ_DISABLED)) | |
1870 | mask_IO_APIC_irq(irq); | |
1871 | ack_APIC_irq(); | |
1872 | } | |
1873 | ||
1874 | /* | |
1875 | * Level triggered interrupts can just be masked, | |
1876 | * and shutting down and starting up the interrupt | |
1877 | * is the same as enabling and disabling them -- except | |
1878 | * with a startup need to return a "was pending" value. | |
1879 | * | |
1880 | * Level triggered interrupts are special because we | |
1881 | * do not touch any IO-APIC register while handling | |
1882 | * them. We ack the APIC in the end-IRQ handler, not | |
1883 | * in the start-IRQ-handler. Protection against reentrance | |
1884 | * from the same interrupt is still provided, both by the | |
1885 | * generic IRQ layer and by the fact that an unacked local | |
1886 | * APIC does not accept IRQs. | |
1887 | */ | |
1888 | static unsigned int startup_level_ioapic_irq (unsigned int irq) | |
1889 | { | |
1890 | unmask_IO_APIC_irq(irq); | |
1891 | ||
1892 | return 0; /* don't check for pending */ | |
1893 | } | |
1894 | ||
1895 | static void end_level_ioapic_irq (unsigned int irq) | |
1896 | { | |
1897 | unsigned long v; | |
1898 | int i; | |
1899 | ||
1900 | move_irq(irq); | |
1901 | /* | |
1902 | * It appears there is an erratum which affects at least version 0x11 | |
1903 | * of I/O APIC (that's the 82093AA and cores integrated into various | |
1904 | * chipsets). Under certain conditions a level-triggered interrupt is | |
1905 | * erroneously delivered as edge-triggered one but the respective IRR | |
1906 | * bit gets set nevertheless. As a result the I/O unit expects an EOI | |
1907 | * message but it will never arrive and further interrupts are blocked | |
1908 | * from the source. The exact reason is so far unknown, but the | |
1909 | * phenomenon was observed when two consecutive interrupt requests | |
1910 | * from a given source get delivered to the same CPU and the source is | |
1911 | * temporarily disabled in between. | |
1912 | * | |
1913 | * A workaround is to simulate an EOI message manually. We achieve it | |
1914 | * by setting the trigger mode to edge and then to level when the edge | |
1915 | * trigger mode gets detected in the TMR of a local APIC for a | |
1916 | * level-triggered interrupt. We mask the source for the time of the | |
1917 | * operation to prevent an edge-triggered interrupt escaping meanwhile. | |
1918 | * The idea is from Manfred Spraul. --macro | |
1919 | */ | |
1920 | i = IO_APIC_VECTOR(irq); | |
1921 | ||
1922 | v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1)); | |
1923 | ||
1924 | ack_APIC_irq(); | |
1925 | ||
1926 | if (!(v & (1 << (i & 0x1f)))) { | |
1927 | atomic_inc(&irq_mis_count); | |
1928 | spin_lock(&ioapic_lock); | |
1929 | __mask_and_edge_IO_APIC_irq(irq); | |
1930 | __unmask_and_level_IO_APIC_irq(irq); | |
1931 | spin_unlock(&ioapic_lock); | |
1932 | } | |
1933 | } | |
1934 | ||
1935 | #ifdef CONFIG_PCI_MSI | |
1936 | static unsigned int startup_edge_ioapic_vector(unsigned int vector) | |
1937 | { | |
1938 | int irq = vector_to_irq(vector); | |
1939 | ||
1940 | return startup_edge_ioapic_irq(irq); | |
1941 | } | |
1942 | ||
1943 | static void ack_edge_ioapic_vector(unsigned int vector) | |
1944 | { | |
1945 | int irq = vector_to_irq(vector); | |
1946 | ||
1947 | ack_edge_ioapic_irq(irq); | |
1948 | } | |
1949 | ||
1950 | static unsigned int startup_level_ioapic_vector (unsigned int vector) | |
1951 | { | |
1952 | int irq = vector_to_irq(vector); | |
1953 | ||
1954 | return startup_level_ioapic_irq (irq); | |
1955 | } | |
1956 | ||
1957 | static void end_level_ioapic_vector (unsigned int vector) | |
1958 | { | |
1959 | int irq = vector_to_irq(vector); | |
1960 | ||
1961 | end_level_ioapic_irq(irq); | |
1962 | } | |
1963 | ||
1964 | static void mask_IO_APIC_vector (unsigned int vector) | |
1965 | { | |
1966 | int irq = vector_to_irq(vector); | |
1967 | ||
1968 | mask_IO_APIC_irq(irq); | |
1969 | } | |
1970 | ||
1971 | static void unmask_IO_APIC_vector (unsigned int vector) | |
1972 | { | |
1973 | int irq = vector_to_irq(vector); | |
1974 | ||
1975 | unmask_IO_APIC_irq(irq); | |
1976 | } | |
1977 | ||
1978 | static void set_ioapic_affinity_vector (unsigned int vector, | |
1979 | cpumask_t cpu_mask) | |
1980 | { | |
1981 | int irq = vector_to_irq(vector); | |
1982 | ||
1983 | set_ioapic_affinity_irq(irq, cpu_mask); | |
1984 | } | |
1985 | #endif | |
1986 | ||
1987 | /* | |
1988 | * Level and edge triggered IO-APIC interrupts need different handling, | |
1989 | * so we use two separate IRQ descriptors. Edge triggered IRQs can be | |
1990 | * handled with the level-triggered descriptor, but that one has slightly | |
1991 | * more overhead. Level-triggered interrupts cannot be handled with the | |
1992 | * edge-triggered handler, without risking IRQ storms and other ugly | |
1993 | * races. | |
1994 | */ | |
1995 | static struct hw_interrupt_type ioapic_edge_type = { | |
1996 | .typename = "IO-APIC-edge", | |
1997 | .startup = startup_edge_ioapic, | |
1998 | .shutdown = shutdown_edge_ioapic, | |
1999 | .enable = enable_edge_ioapic, | |
2000 | .disable = disable_edge_ioapic, | |
2001 | .ack = ack_edge_ioapic, | |
2002 | .end = end_edge_ioapic, | |
2003 | .set_affinity = set_ioapic_affinity, | |
2004 | }; | |
2005 | ||
2006 | static struct hw_interrupt_type ioapic_level_type = { | |
2007 | .typename = "IO-APIC-level", | |
2008 | .startup = startup_level_ioapic, | |
2009 | .shutdown = shutdown_level_ioapic, | |
2010 | .enable = enable_level_ioapic, | |
2011 | .disable = disable_level_ioapic, | |
2012 | .ack = mask_and_ack_level_ioapic, | |
2013 | .end = end_level_ioapic, | |
2014 | .set_affinity = set_ioapic_affinity, | |
2015 | }; | |
2016 | ||
2017 | static inline void init_IO_APIC_traps(void) | |
2018 | { | |
2019 | int irq; | |
2020 | ||
2021 | /* | |
2022 | * NOTE! The local APIC isn't very good at handling | |
2023 | * multiple interrupts at the same interrupt level. | |
2024 | * As the interrupt level is determined by taking the | |
2025 | * vector number and shifting that right by 4, we | |
2026 | * want to spread these out a bit so that they don't | |
2027 | * all fall in the same interrupt level. | |
2028 | * | |
2029 | * Also, we've got to be careful not to trash gate | |
2030 | * 0x80, because int 0x80 is hm, kind of importantish. ;) | |
2031 | */ | |
2032 | for (irq = 0; irq < NR_IRQS ; irq++) { | |
2033 | int tmp = irq; | |
2034 | if (use_pci_vector()) { | |
2035 | if (!platform_legacy_irq(tmp)) | |
2036 | if ((tmp = vector_to_irq(tmp)) == -1) | |
2037 | continue; | |
2038 | } | |
2039 | if (IO_APIC_IRQ(tmp) && !IO_APIC_VECTOR(tmp)) { | |
2040 | /* | |
2041 | * Hmm.. We don't have an entry for this, | |
2042 | * so default to an old-fashioned 8259 | |
2043 | * interrupt if we can.. | |
2044 | */ | |
2045 | if (irq < 16) | |
2046 | make_8259A_irq(irq); | |
2047 | else | |
2048 | /* Strange. Oh, well.. */ | |
2049 | irq_desc[irq].handler = &no_irq_type; | |
2050 | } | |
2051 | } | |
2052 | } | |
2053 | ||
2054 | static void enable_lapic_irq (unsigned int irq) | |
2055 | { | |
2056 | unsigned long v; | |
2057 | ||
2058 | v = apic_read(APIC_LVT0); | |
2059 | apic_write_around(APIC_LVT0, v & ~APIC_LVT_MASKED); | |
2060 | } | |
2061 | ||
2062 | static void disable_lapic_irq (unsigned int irq) | |
2063 | { | |
2064 | unsigned long v; | |
2065 | ||
2066 | v = apic_read(APIC_LVT0); | |
2067 | apic_write_around(APIC_LVT0, v | APIC_LVT_MASKED); | |
2068 | } | |
2069 | ||
2070 | static void ack_lapic_irq (unsigned int irq) | |
2071 | { | |
2072 | ack_APIC_irq(); | |
2073 | } | |
2074 | ||
2075 | static void end_lapic_irq (unsigned int i) { /* nothing */ } | |
2076 | ||
2077 | static struct hw_interrupt_type lapic_irq_type = { | |
2078 | .typename = "local-APIC-edge", | |
2079 | .startup = NULL, /* startup_irq() not used for IRQ0 */ | |
2080 | .shutdown = NULL, /* shutdown_irq() not used for IRQ0 */ | |
2081 | .enable = enable_lapic_irq, | |
2082 | .disable = disable_lapic_irq, | |
2083 | .ack = ack_lapic_irq, | |
2084 | .end = end_lapic_irq | |
2085 | }; | |
2086 | ||
2087 | static void setup_nmi (void) | |
2088 | { | |
2089 | /* | |
2090 | * Dirty trick to enable the NMI watchdog ... | |
2091 | * We put the 8259A master into AEOI mode and | |
2092 | * unmask on all local APICs LVT0 as NMI. | |
2093 | * | |
2094 | * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire') | |
2095 | * is from Maciej W. Rozycki - so we do not have to EOI from | |
2096 | * the NMI handler or the timer interrupt. | |
2097 | */ | |
2098 | apic_printk(APIC_VERBOSE, KERN_INFO "activating NMI Watchdog ..."); | |
2099 | ||
2100 | on_each_cpu(enable_NMI_through_LVT0, NULL, 1, 1); | |
2101 | ||
2102 | apic_printk(APIC_VERBOSE, " done.\n"); | |
2103 | } | |
2104 | ||
2105 | /* | |
2106 | * This looks a bit hackish but it's about the only one way of sending | |
2107 | * a few INTA cycles to 8259As and any associated glue logic. ICR does | |
2108 | * not support the ExtINT mode, unfortunately. We need to send these | |
2109 | * cycles as some i82489DX-based boards have glue logic that keeps the | |
2110 | * 8259A interrupt line asserted until INTA. --macro | |
2111 | */ | |
2112 | static inline void unlock_ExtINT_logic(void) | |
2113 | { | |
2114 | int pin, i; | |
2115 | struct IO_APIC_route_entry entry0, entry1; | |
2116 | unsigned char save_control, save_freq_select; | |
2117 | unsigned long flags; | |
2118 | ||
2119 | pin = find_isa_irq_pin(8, mp_INT); | |
2120 | if (pin == -1) | |
2121 | return; | |
2122 | ||
2123 | spin_lock_irqsave(&ioapic_lock, flags); | |
2124 | *(((int *)&entry0) + 1) = io_apic_read(0, 0x11 + 2 * pin); | |
2125 | *(((int *)&entry0) + 0) = io_apic_read(0, 0x10 + 2 * pin); | |
2126 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
2127 | clear_IO_APIC_pin(0, pin); | |
2128 | ||
2129 | memset(&entry1, 0, sizeof(entry1)); | |
2130 | ||
2131 | entry1.dest_mode = 0; /* physical delivery */ | |
2132 | entry1.mask = 0; /* unmask IRQ now */ | |
2133 | entry1.dest.physical.physical_dest = hard_smp_processor_id(); | |
2134 | entry1.delivery_mode = dest_ExtINT; | |
2135 | entry1.polarity = entry0.polarity; | |
2136 | entry1.trigger = 0; | |
2137 | entry1.vector = 0; | |
2138 | ||
2139 | spin_lock_irqsave(&ioapic_lock, flags); | |
2140 | io_apic_write(0, 0x11 + 2 * pin, *(((int *)&entry1) + 1)); | |
2141 | io_apic_write(0, 0x10 + 2 * pin, *(((int *)&entry1) + 0)); | |
2142 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
2143 | ||
2144 | save_control = CMOS_READ(RTC_CONTROL); | |
2145 | save_freq_select = CMOS_READ(RTC_FREQ_SELECT); | |
2146 | CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6, | |
2147 | RTC_FREQ_SELECT); | |
2148 | CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL); | |
2149 | ||
2150 | i = 100; | |
2151 | while (i-- > 0) { | |
2152 | mdelay(10); | |
2153 | if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF) | |
2154 | i -= 10; | |
2155 | } | |
2156 | ||
2157 | CMOS_WRITE(save_control, RTC_CONTROL); | |
2158 | CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT); | |
2159 | clear_IO_APIC_pin(0, pin); | |
2160 | ||
2161 | spin_lock_irqsave(&ioapic_lock, flags); | |
2162 | io_apic_write(0, 0x11 + 2 * pin, *(((int *)&entry0) + 1)); | |
2163 | io_apic_write(0, 0x10 + 2 * pin, *(((int *)&entry0) + 0)); | |
2164 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
2165 | } | |
2166 | ||
2167 | /* | |
2168 | * This code may look a bit paranoid, but it's supposed to cooperate with | |
2169 | * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ | |
2170 | * is so screwy. Thanks to Brian Perkins for testing/hacking this beast | |
2171 | * fanatically on his truly buggy board. | |
2172 | */ | |
2173 | static inline void check_timer(void) | |
2174 | { | |
2175 | int pin1, pin2; | |
2176 | int vector; | |
2177 | ||
2178 | /* | |
2179 | * get/set the timer IRQ vector: | |
2180 | */ | |
2181 | disable_8259A_irq(0); | |
2182 | vector = assign_irq_vector(0); | |
2183 | set_intr_gate(vector, interrupt[0]); | |
2184 | ||
2185 | /* | |
2186 | * Subtle, code in do_timer_interrupt() expects an AEOI | |
2187 | * mode for the 8259A whenever interrupts are routed | |
2188 | * through I/O APICs. Also IRQ0 has to be enabled in | |
2189 | * the 8259A which implies the virtual wire has to be | |
2190 | * disabled in the local APIC. | |
2191 | */ | |
2192 | apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT); | |
2193 | init_8259A(1); | |
2194 | timer_ack = 1; | |
2195 | enable_8259A_irq(0); | |
2196 | ||
2197 | pin1 = find_isa_irq_pin(0, mp_INT); | |
2198 | pin2 = find_isa_irq_pin(0, mp_ExtINT); | |
2199 | ||
2200 | printk(KERN_INFO "..TIMER: vector=0x%02X pin1=%d pin2=%d\n", vector, pin1, pin2); | |
2201 | ||
2202 | if (pin1 != -1) { | |
2203 | /* | |
2204 | * Ok, does IRQ0 through the IOAPIC work? | |
2205 | */ | |
2206 | unmask_IO_APIC_irq(0); | |
2207 | if (timer_irq_works()) { | |
2208 | if (nmi_watchdog == NMI_IO_APIC) { | |
2209 | disable_8259A_irq(0); | |
2210 | setup_nmi(); | |
2211 | enable_8259A_irq(0); | |
1da177e4 LT |
2212 | } |
2213 | return; | |
2214 | } | |
2215 | clear_IO_APIC_pin(0, pin1); | |
2216 | printk(KERN_ERR "..MP-BIOS bug: 8254 timer not connected to IO-APIC\n"); | |
2217 | } | |
2218 | ||
2219 | printk(KERN_INFO "...trying to set up timer (IRQ0) through the 8259A ... "); | |
2220 | if (pin2 != -1) { | |
2221 | printk("\n..... (found pin %d) ...", pin2); | |
2222 | /* | |
2223 | * legacy devices should be connected to IO APIC #0 | |
2224 | */ | |
2225 | setup_ExtINT_IRQ0_pin(pin2, vector); | |
2226 | if (timer_irq_works()) { | |
2227 | printk("works.\n"); | |
2228 | if (pin1 != -1) | |
2229 | replace_pin_at_irq(0, 0, pin1, 0, pin2); | |
2230 | else | |
2231 | add_pin_to_irq(0, 0, pin2); | |
2232 | if (nmi_watchdog == NMI_IO_APIC) { | |
2233 | setup_nmi(); | |
1da177e4 LT |
2234 | } |
2235 | return; | |
2236 | } | |
2237 | /* | |
2238 | * Cleanup, just in case ... | |
2239 | */ | |
2240 | clear_IO_APIC_pin(0, pin2); | |
2241 | } | |
2242 | printk(" failed.\n"); | |
2243 | ||
2244 | if (nmi_watchdog == NMI_IO_APIC) { | |
2245 | printk(KERN_WARNING "timer doesn't work through the IO-APIC - disabling NMI Watchdog!\n"); | |
2246 | nmi_watchdog = 0; | |
2247 | } | |
2248 | ||
2249 | printk(KERN_INFO "...trying to set up timer as Virtual Wire IRQ..."); | |
2250 | ||
2251 | disable_8259A_irq(0); | |
2252 | irq_desc[0].handler = &lapic_irq_type; | |
2253 | apic_write_around(APIC_LVT0, APIC_DM_FIXED | vector); /* Fixed mode */ | |
2254 | enable_8259A_irq(0); | |
2255 | ||
2256 | if (timer_irq_works()) { | |
2257 | printk(" works.\n"); | |
2258 | return; | |
2259 | } | |
2260 | apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | vector); | |
2261 | printk(" failed.\n"); | |
2262 | ||
2263 | printk(KERN_INFO "...trying to set up timer as ExtINT IRQ..."); | |
2264 | ||
2265 | timer_ack = 0; | |
2266 | init_8259A(0); | |
2267 | make_8259A_irq(0); | |
2268 | apic_write_around(APIC_LVT0, APIC_DM_EXTINT); | |
2269 | ||
2270 | unlock_ExtINT_logic(); | |
2271 | ||
2272 | if (timer_irq_works()) { | |
2273 | printk(" works.\n"); | |
2274 | return; | |
2275 | } | |
2276 | printk(" failed :(.\n"); | |
2277 | panic("IO-APIC + timer doesn't work! Boot with apic=debug and send a " | |
2278 | "report. Then try booting with the 'noapic' option"); | |
2279 | } | |
2280 | ||
2281 | /* | |
2282 | * | |
2283 | * IRQ's that are handled by the PIC in the MPS IOAPIC case. | |
2284 | * - IRQ2 is the cascade IRQ, and cannot be a io-apic IRQ. | |
2285 | * Linux doesn't really care, as it's not actually used | |
2286 | * for any interrupt handling anyway. | |
2287 | */ | |
2288 | #define PIC_IRQS (1 << PIC_CASCADE_IR) | |
2289 | ||
2290 | void __init setup_IO_APIC(void) | |
2291 | { | |
2292 | enable_IO_APIC(); | |
2293 | ||
2294 | if (acpi_ioapic) | |
2295 | io_apic_irqs = ~0; /* all IRQs go through IOAPIC */ | |
2296 | else | |
2297 | io_apic_irqs = ~PIC_IRQS; | |
2298 | ||
2299 | printk("ENABLING IO-APIC IRQs\n"); | |
2300 | ||
2301 | /* | |
2302 | * Set up IO-APIC IRQ routing. | |
2303 | */ | |
2304 | if (!acpi_ioapic) | |
2305 | setup_ioapic_ids_from_mpc(); | |
2306 | sync_Arb_IDs(); | |
2307 | setup_IO_APIC_irqs(); | |
2308 | init_IO_APIC_traps(); | |
2309 | check_timer(); | |
2310 | if (!acpi_ioapic) | |
2311 | print_IO_APIC(); | |
2312 | } | |
2313 | ||
2314 | /* | |
2315 | * Called after all the initialization is done. If we didnt find any | |
2316 | * APIC bugs then we can allow the modify fast path | |
2317 | */ | |
2318 | ||
2319 | static int __init io_apic_bug_finalize(void) | |
2320 | { | |
2321 | if(sis_apic_bug == -1) | |
2322 | sis_apic_bug = 0; | |
2323 | return 0; | |
2324 | } | |
2325 | ||
2326 | late_initcall(io_apic_bug_finalize); | |
2327 | ||
2328 | struct sysfs_ioapic_data { | |
2329 | struct sys_device dev; | |
2330 | struct IO_APIC_route_entry entry[0]; | |
2331 | }; | |
2332 | static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS]; | |
2333 | ||
438510f6 | 2334 | static int ioapic_suspend(struct sys_device *dev, pm_message_t state) |
1da177e4 LT |
2335 | { |
2336 | struct IO_APIC_route_entry *entry; | |
2337 | struct sysfs_ioapic_data *data; | |
2338 | unsigned long flags; | |
2339 | int i; | |
2340 | ||
2341 | data = container_of(dev, struct sysfs_ioapic_data, dev); | |
2342 | entry = data->entry; | |
2343 | spin_lock_irqsave(&ioapic_lock, flags); | |
2344 | for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ ) { | |
2345 | *(((int *)entry) + 1) = io_apic_read(dev->id, 0x11 + 2 * i); | |
2346 | *(((int *)entry) + 0) = io_apic_read(dev->id, 0x10 + 2 * i); | |
2347 | } | |
2348 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
2349 | ||
2350 | return 0; | |
2351 | } | |
2352 | ||
2353 | static int ioapic_resume(struct sys_device *dev) | |
2354 | { | |
2355 | struct IO_APIC_route_entry *entry; | |
2356 | struct sysfs_ioapic_data *data; | |
2357 | unsigned long flags; | |
2358 | union IO_APIC_reg_00 reg_00; | |
2359 | int i; | |
2360 | ||
2361 | data = container_of(dev, struct sysfs_ioapic_data, dev); | |
2362 | entry = data->entry; | |
2363 | ||
2364 | spin_lock_irqsave(&ioapic_lock, flags); | |
2365 | reg_00.raw = io_apic_read(dev->id, 0); | |
2366 | if (reg_00.bits.ID != mp_ioapics[dev->id].mpc_apicid) { | |
2367 | reg_00.bits.ID = mp_ioapics[dev->id].mpc_apicid; | |
2368 | io_apic_write(dev->id, 0, reg_00.raw); | |
2369 | } | |
2370 | for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ ) { | |
2371 | io_apic_write(dev->id, 0x11+2*i, *(((int *)entry)+1)); | |
2372 | io_apic_write(dev->id, 0x10+2*i, *(((int *)entry)+0)); | |
2373 | } | |
2374 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
2375 | ||
2376 | return 0; | |
2377 | } | |
2378 | ||
2379 | static struct sysdev_class ioapic_sysdev_class = { | |
2380 | set_kset_name("ioapic"), | |
2381 | .suspend = ioapic_suspend, | |
2382 | .resume = ioapic_resume, | |
2383 | }; | |
2384 | ||
2385 | static int __init ioapic_init_sysfs(void) | |
2386 | { | |
2387 | struct sys_device * dev; | |
2388 | int i, size, error = 0; | |
2389 | ||
2390 | error = sysdev_class_register(&ioapic_sysdev_class); | |
2391 | if (error) | |
2392 | return error; | |
2393 | ||
2394 | for (i = 0; i < nr_ioapics; i++ ) { | |
2395 | size = sizeof(struct sys_device) + nr_ioapic_registers[i] | |
2396 | * sizeof(struct IO_APIC_route_entry); | |
2397 | mp_ioapic_data[i] = kmalloc(size, GFP_KERNEL); | |
2398 | if (!mp_ioapic_data[i]) { | |
2399 | printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i); | |
2400 | continue; | |
2401 | } | |
2402 | memset(mp_ioapic_data[i], 0, size); | |
2403 | dev = &mp_ioapic_data[i]->dev; | |
2404 | dev->id = i; | |
2405 | dev->cls = &ioapic_sysdev_class; | |
2406 | error = sysdev_register(dev); | |
2407 | if (error) { | |
2408 | kfree(mp_ioapic_data[i]); | |
2409 | mp_ioapic_data[i] = NULL; | |
2410 | printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i); | |
2411 | continue; | |
2412 | } | |
2413 | } | |
2414 | ||
2415 | return 0; | |
2416 | } | |
2417 | ||
2418 | device_initcall(ioapic_init_sysfs); | |
2419 | ||
2420 | /* -------------------------------------------------------------------------- | |
2421 | ACPI-based IOAPIC Configuration | |
2422 | -------------------------------------------------------------------------- */ | |
2423 | ||
2424 | #ifdef CONFIG_ACPI_BOOT | |
2425 | ||
2426 | int __init io_apic_get_unique_id (int ioapic, int apic_id) | |
2427 | { | |
2428 | union IO_APIC_reg_00 reg_00; | |
2429 | static physid_mask_t apic_id_map = PHYSID_MASK_NONE; | |
2430 | physid_mask_t tmp; | |
2431 | unsigned long flags; | |
2432 | int i = 0; | |
2433 | ||
2434 | /* | |
2435 | * The P4 platform supports up to 256 APIC IDs on two separate APIC | |
2436 | * buses (one for LAPICs, one for IOAPICs), where predecessors only | |
2437 | * supports up to 16 on one shared APIC bus. | |
2438 | * | |
2439 | * TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full | |
2440 | * advantage of new APIC bus architecture. | |
2441 | */ | |
2442 | ||
2443 | if (physids_empty(apic_id_map)) | |
2444 | apic_id_map = ioapic_phys_id_map(phys_cpu_present_map); | |
2445 | ||
2446 | spin_lock_irqsave(&ioapic_lock, flags); | |
2447 | reg_00.raw = io_apic_read(ioapic, 0); | |
2448 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
2449 | ||
2450 | if (apic_id >= get_physical_broadcast()) { | |
2451 | printk(KERN_WARNING "IOAPIC[%d]: Invalid apic_id %d, trying " | |
2452 | "%d\n", ioapic, apic_id, reg_00.bits.ID); | |
2453 | apic_id = reg_00.bits.ID; | |
2454 | } | |
2455 | ||
2456 | /* | |
2457 | * Every APIC in a system must have a unique ID or we get lots of nice | |
2458 | * 'stuck on smp_invalidate_needed IPI wait' messages. | |
2459 | */ | |
2460 | if (check_apicid_used(apic_id_map, apic_id)) { | |
2461 | ||
2462 | for (i = 0; i < get_physical_broadcast(); i++) { | |
2463 | if (!check_apicid_used(apic_id_map, i)) | |
2464 | break; | |
2465 | } | |
2466 | ||
2467 | if (i == get_physical_broadcast()) | |
2468 | panic("Max apic_id exceeded!\n"); | |
2469 | ||
2470 | printk(KERN_WARNING "IOAPIC[%d]: apic_id %d already used, " | |
2471 | "trying %d\n", ioapic, apic_id, i); | |
2472 | ||
2473 | apic_id = i; | |
2474 | } | |
2475 | ||
2476 | tmp = apicid_to_cpu_present(apic_id); | |
2477 | physids_or(apic_id_map, apic_id_map, tmp); | |
2478 | ||
2479 | if (reg_00.bits.ID != apic_id) { | |
2480 | reg_00.bits.ID = apic_id; | |
2481 | ||
2482 | spin_lock_irqsave(&ioapic_lock, flags); | |
2483 | io_apic_write(ioapic, 0, reg_00.raw); | |
2484 | reg_00.raw = io_apic_read(ioapic, 0); | |
2485 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
2486 | ||
2487 | /* Sanity check */ | |
2488 | if (reg_00.bits.ID != apic_id) | |
2489 | panic("IOAPIC[%d]: Unable change apic_id!\n", ioapic); | |
2490 | } | |
2491 | ||
2492 | apic_printk(APIC_VERBOSE, KERN_INFO | |
2493 | "IOAPIC[%d]: Assigned apic_id %d\n", ioapic, apic_id); | |
2494 | ||
2495 | return apic_id; | |
2496 | } | |
2497 | ||
2498 | ||
2499 | int __init io_apic_get_version (int ioapic) | |
2500 | { | |
2501 | union IO_APIC_reg_01 reg_01; | |
2502 | unsigned long flags; | |
2503 | ||
2504 | spin_lock_irqsave(&ioapic_lock, flags); | |
2505 | reg_01.raw = io_apic_read(ioapic, 1); | |
2506 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
2507 | ||
2508 | return reg_01.bits.version; | |
2509 | } | |
2510 | ||
2511 | ||
2512 | int __init io_apic_get_redir_entries (int ioapic) | |
2513 | { | |
2514 | union IO_APIC_reg_01 reg_01; | |
2515 | unsigned long flags; | |
2516 | ||
2517 | spin_lock_irqsave(&ioapic_lock, flags); | |
2518 | reg_01.raw = io_apic_read(ioapic, 1); | |
2519 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
2520 | ||
2521 | return reg_01.bits.entries; | |
2522 | } | |
2523 | ||
2524 | ||
2525 | int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int active_high_low) | |
2526 | { | |
2527 | struct IO_APIC_route_entry entry; | |
2528 | unsigned long flags; | |
2529 | ||
2530 | if (!IO_APIC_IRQ(irq)) { | |
2531 | printk(KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n", | |
2532 | ioapic); | |
2533 | return -EINVAL; | |
2534 | } | |
2535 | ||
2536 | /* | |
2537 | * Generate a PCI IRQ routing entry and program the IOAPIC accordingly. | |
2538 | * Note that we mask (disable) IRQs now -- these get enabled when the | |
2539 | * corresponding device driver registers for this IRQ. | |
2540 | */ | |
2541 | ||
2542 | memset(&entry,0,sizeof(entry)); | |
2543 | ||
2544 | entry.delivery_mode = INT_DELIVERY_MODE; | |
2545 | entry.dest_mode = INT_DEST_MODE; | |
2546 | entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS); | |
2547 | entry.trigger = edge_level; | |
2548 | entry.polarity = active_high_low; | |
2549 | entry.mask = 1; | |
2550 | ||
2551 | /* | |
2552 | * IRQs < 16 are already in the irq_2_pin[] map | |
2553 | */ | |
2554 | if (irq >= 16) | |
2555 | add_pin_to_irq(irq, ioapic, pin); | |
2556 | ||
2557 | entry.vector = assign_irq_vector(irq); | |
2558 | ||
2559 | apic_printk(APIC_DEBUG, KERN_DEBUG "IOAPIC[%d]: Set PCI routing entry " | |
2560 | "(%d-%d -> 0x%x -> IRQ %d Mode:%i Active:%i)\n", ioapic, | |
2561 | mp_ioapics[ioapic].mpc_apicid, pin, entry.vector, irq, | |
2562 | edge_level, active_high_low); | |
2563 | ||
2564 | ioapic_register_intr(irq, entry.vector, edge_level); | |
2565 | ||
2566 | if (!ioapic && (irq < 16)) | |
2567 | disable_8259A_irq(irq); | |
2568 | ||
2569 | spin_lock_irqsave(&ioapic_lock, flags); | |
2570 | io_apic_write(ioapic, 0x11+2*pin, *(((int *)&entry)+1)); | |
2571 | io_apic_write(ioapic, 0x10+2*pin, *(((int *)&entry)+0)); | |
2572 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
2573 | ||
2574 | return 0; | |
2575 | } | |
2576 | ||
2577 | #endif /*CONFIG_ACPI_BOOT*/ |