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> | |
589e367f | 28 | #include <linux/pci.h> |
1da177e4 LT |
29 | #include <linux/mc146818rtc.h> |
30 | #include <linux/acpi.h> | |
31 | #include <linux/sysdev.h> | |
3b7d1921 | 32 | #include <linux/msi.h> |
95d77884 | 33 | #include <linux/htirq.h> |
3460a6d9 | 34 | #include <linux/dmar.h> |
1d16b53e | 35 | #include <linux/jiffies.h> |
ab688059 AK |
36 | #ifdef CONFIG_ACPI |
37 | #include <acpi/acpi_bus.h> | |
38 | #endif | |
3e35a0e5 | 39 | #include <linux/bootmem.h> |
1da177e4 | 40 | |
61014292 | 41 | #include <asm/idle.h> |
1da177e4 LT |
42 | #include <asm/io.h> |
43 | #include <asm/smp.h> | |
44 | #include <asm/desc.h> | |
45 | #include <asm/proto.h> | |
8d916406 | 46 | #include <asm/acpi.h> |
ca8642f6 | 47 | #include <asm/dma.h> |
17c44697 | 48 | #include <asm/i8259.h> |
3e4ff115 | 49 | #include <asm/nmi.h> |
589e367f | 50 | #include <asm/msidef.h> |
8b955b0d | 51 | #include <asm/hypertransport.h> |
1da177e4 | 52 | |
5af5573e | 53 | #include <mach_ipi.h> |
dd46e3ca | 54 | #include <mach_apic.h> |
5af5573e | 55 | |
13a79503 EB |
56 | struct irq_cfg { |
57 | cpumask_t domain; | |
61014292 EB |
58 | cpumask_t old_domain; |
59 | unsigned move_cleanup_count; | |
13a79503 | 60 | u8 vector; |
61014292 | 61 | u8 move_in_progress : 1; |
13a79503 EB |
62 | }; |
63 | ||
64 | /* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */ | |
7223daf5 | 65 | static struct irq_cfg irq_cfg[NR_IRQS] __read_mostly = { |
bc5e81a1 EB |
66 | [0] = { .domain = CPU_MASK_ALL, .vector = IRQ0_VECTOR, }, |
67 | [1] = { .domain = CPU_MASK_ALL, .vector = IRQ1_VECTOR, }, | |
68 | [2] = { .domain = CPU_MASK_ALL, .vector = IRQ2_VECTOR, }, | |
69 | [3] = { .domain = CPU_MASK_ALL, .vector = IRQ3_VECTOR, }, | |
70 | [4] = { .domain = CPU_MASK_ALL, .vector = IRQ4_VECTOR, }, | |
71 | [5] = { .domain = CPU_MASK_ALL, .vector = IRQ5_VECTOR, }, | |
72 | [6] = { .domain = CPU_MASK_ALL, .vector = IRQ6_VECTOR, }, | |
73 | [7] = { .domain = CPU_MASK_ALL, .vector = IRQ7_VECTOR, }, | |
74 | [8] = { .domain = CPU_MASK_ALL, .vector = IRQ8_VECTOR, }, | |
75 | [9] = { .domain = CPU_MASK_ALL, .vector = IRQ9_VECTOR, }, | |
76 | [10] = { .domain = CPU_MASK_ALL, .vector = IRQ10_VECTOR, }, | |
77 | [11] = { .domain = CPU_MASK_ALL, .vector = IRQ11_VECTOR, }, | |
78 | [12] = { .domain = CPU_MASK_ALL, .vector = IRQ12_VECTOR, }, | |
79 | [13] = { .domain = CPU_MASK_ALL, .vector = IRQ13_VECTOR, }, | |
80 | [14] = { .domain = CPU_MASK_ALL, .vector = IRQ14_VECTOR, }, | |
81 | [15] = { .domain = CPU_MASK_ALL, .vector = IRQ15_VECTOR, }, | |
13a79503 EB |
82 | }; |
83 | ||
dfbffdd8 | 84 | static int assign_irq_vector(int irq, cpumask_t mask); |
04b9267b | 85 | |
305b92a2 AM |
86 | int first_system_vector = 0xfe; |
87 | ||
88 | char system_vectors[NR_VECTORS] = { [0 ... NR_VECTORS-1] = SYS_VECTOR_FREE}; | |
89 | ||
1da177e4 LT |
90 | #define __apicdebuginit __init |
91 | ||
92 | int sis_apic_bug; /* not actually supported, dummy for compile */ | |
93 | ||
14d98cad AK |
94 | static int no_timer_check; |
95 | ||
fea5f1e1 LT |
96 | static int disable_timer_pin_1 __initdata; |
97 | ||
35542c5e | 98 | int timer_through_8259 __initdata; |
fea5f1e1 | 99 | |
1008fddc EB |
100 | /* Where if anywhere is the i8259 connect in external int mode */ |
101 | static struct { int pin, apic; } ioapic_i8259 = { -1, -1 }; | |
102 | ||
1da177e4 | 103 | static DEFINE_SPINLOCK(ioapic_lock); |
70a0a535 | 104 | DEFINE_SPINLOCK(vector_lock); |
1da177e4 LT |
105 | |
106 | /* | |
107 | * # of IRQ routing registers | |
108 | */ | |
109 | int nr_ioapic_registers[MAX_IO_APICS]; | |
110 | ||
9c7408f3 | 111 | /* I/O APIC entries */ |
ec2cd0a2 | 112 | struct mp_config_ioapic mp_ioapics[MAX_IO_APICS]; |
9c7408f3 AS |
113 | int nr_ioapics; |
114 | ||
350bae1d | 115 | /* MP IRQ source entries */ |
2fddb6e2 | 116 | struct mp_config_intsrc mp_irqs[MAX_IRQ_SOURCES]; |
350bae1d AS |
117 | |
118 | /* # of MP IRQ source entries */ | |
119 | int mp_irq_entries; | |
120 | ||
8732fc4b AS |
121 | DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES); |
122 | ||
1da177e4 LT |
123 | /* |
124 | * Rough estimation of how many shared IRQs there are, can | |
125 | * be changed anytime. | |
126 | */ | |
e273d140 | 127 | #define MAX_PLUS_SHARED_IRQS NR_IRQS |
1da177e4 LT |
128 | #define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS) |
129 | ||
130 | /* | |
131 | * This is performance-critical, we want to do it O(1) | |
132 | * | |
133 | * the indexing order of this array favors 1:1 mappings | |
134 | * between pins and IRQs. | |
135 | */ | |
136 | ||
137 | static struct irq_pin_list { | |
138 | short apic, pin, next; | |
139 | } irq_2_pin[PIN_MAP_SIZE]; | |
140 | ||
6c0ffb9d LT |
141 | struct io_apic { |
142 | unsigned int index; | |
143 | unsigned int unused[3]; | |
144 | unsigned int data; | |
145 | }; | |
146 | ||
147 | static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx) | |
148 | { | |
149 | return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx) | |
ec2cd0a2 | 150 | + (mp_ioapics[idx].mp_apicaddr & ~PAGE_MASK); |
6c0ffb9d LT |
151 | } |
152 | ||
153 | static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg) | |
154 | { | |
155 | struct io_apic __iomem *io_apic = io_apic_base(apic); | |
156 | writel(reg, &io_apic->index); | |
157 | return readl(&io_apic->data); | |
158 | } | |
159 | ||
160 | static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value) | |
161 | { | |
162 | struct io_apic __iomem *io_apic = io_apic_base(apic); | |
163 | writel(reg, &io_apic->index); | |
164 | writel(value, &io_apic->data); | |
165 | } | |
166 | ||
167 | /* | |
168 | * Re-write a value: to be used for read-modify-write | |
169 | * cycles where the read already set up the index register. | |
170 | */ | |
171 | static inline void io_apic_modify(unsigned int apic, unsigned int value) | |
172 | { | |
173 | struct io_apic __iomem *io_apic = io_apic_base(apic); | |
174 | writel(value, &io_apic->data); | |
175 | } | |
176 | ||
9d25cb08 | 177 | static bool io_apic_level_ack_pending(unsigned int irq) |
ef3e28c5 EB |
178 | { |
179 | struct irq_pin_list *entry; | |
180 | unsigned long flags; | |
ef3e28c5 EB |
181 | |
182 | spin_lock_irqsave(&ioapic_lock, flags); | |
183 | entry = irq_2_pin + irq; | |
184 | for (;;) { | |
185 | unsigned int reg; | |
186 | int pin; | |
187 | ||
188 | pin = entry->pin; | |
189 | if (pin == -1) | |
190 | break; | |
191 | reg = io_apic_read(entry->apic, 0x10 + pin*2); | |
192 | /* Is the remote IRR bit set? */ | |
46b3b4ef | 193 | if (reg & IO_APIC_REDIR_REMOTE_IRR) { |
9d25cb08 AM |
194 | spin_unlock_irqrestore(&ioapic_lock, flags); |
195 | return true; | |
196 | } | |
ef3e28c5 EB |
197 | if (!entry->next) |
198 | break; | |
199 | entry = irq_2_pin + entry->next; | |
200 | } | |
201 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
9d25cb08 AM |
202 | |
203 | return false; | |
ef3e28c5 EB |
204 | } |
205 | ||
6c0ffb9d LT |
206 | /* |
207 | * Synchronize the IO-APIC and the CPU by doing | |
208 | * a dummy read from the IO-APIC | |
209 | */ | |
210 | static inline void io_apic_sync(unsigned int apic) | |
211 | { | |
212 | struct io_apic __iomem *io_apic = io_apic_base(apic); | |
213 | readl(&io_apic->data); | |
214 | } | |
215 | ||
54d5d424 AR |
216 | #define __DO_ACTION(R, ACTION, FINAL) \ |
217 | \ | |
218 | { \ | |
219 | int pin; \ | |
220 | struct irq_pin_list *entry = irq_2_pin + irq; \ | |
221 | \ | |
6004e1b7 | 222 | BUG_ON(irq >= NR_IRQS); \ |
54d5d424 AR |
223 | for (;;) { \ |
224 | unsigned int reg; \ | |
225 | pin = entry->pin; \ | |
226 | if (pin == -1) \ | |
227 | break; \ | |
228 | reg = io_apic_read(entry->apic, 0x10 + R + pin*2); \ | |
229 | reg ACTION; \ | |
230 | io_apic_modify(entry->apic, reg); \ | |
f45bcd70 | 231 | FINAL; \ |
54d5d424 AR |
232 | if (!entry->next) \ |
233 | break; \ | |
234 | entry = irq_2_pin + entry->next; \ | |
235 | } \ | |
54d5d424 AR |
236 | } |
237 | ||
eea0e11c AK |
238 | union entry_union { |
239 | struct { u32 w1, w2; }; | |
240 | struct IO_APIC_route_entry entry; | |
241 | }; | |
242 | ||
243 | static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin) | |
244 | { | |
245 | union entry_union eu; | |
246 | unsigned long flags; | |
247 | spin_lock_irqsave(&ioapic_lock, flags); | |
248 | eu.w1 = io_apic_read(apic, 0x10 + 2 * pin); | |
249 | eu.w2 = io_apic_read(apic, 0x11 + 2 * pin); | |
250 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
251 | return eu.entry; | |
252 | } | |
253 | ||
48797ebd LT |
254 | /* |
255 | * When we write a new IO APIC routing entry, we need to write the high | |
256 | * word first! If the mask bit in the low word is clear, we will enable | |
257 | * the interrupt, and we need to make sure the entry is fully populated | |
258 | * before that happens. | |
259 | */ | |
516d2836 AK |
260 | static void |
261 | __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e) | |
eea0e11c | 262 | { |
eea0e11c AK |
263 | union entry_union eu; |
264 | eu.entry = e; | |
48797ebd LT |
265 | io_apic_write(apic, 0x11 + 2*pin, eu.w2); |
266 | io_apic_write(apic, 0x10 + 2*pin, eu.w1); | |
516d2836 AK |
267 | } |
268 | ||
269 | static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e) | |
270 | { | |
271 | unsigned long flags; | |
272 | spin_lock_irqsave(&ioapic_lock, flags); | |
273 | __ioapic_write_entry(apic, pin, e); | |
48797ebd LT |
274 | spin_unlock_irqrestore(&ioapic_lock, flags); |
275 | } | |
276 | ||
277 | /* | |
278 | * When we mask an IO APIC routing entry, we need to write the low | |
279 | * word first, in order to set the mask bit before we change the | |
280 | * high bits! | |
281 | */ | |
282 | static void ioapic_mask_entry(int apic, int pin) | |
283 | { | |
284 | unsigned long flags; | |
285 | union entry_union eu = { .entry.mask = 1 }; | |
286 | ||
eea0e11c AK |
287 | spin_lock_irqsave(&ioapic_lock, flags); |
288 | io_apic_write(apic, 0x10 + 2*pin, eu.w1); | |
289 | io_apic_write(apic, 0x11 + 2*pin, eu.w2); | |
290 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
291 | } | |
292 | ||
54d5d424 | 293 | #ifdef CONFIG_SMP |
550f2299 EB |
294 | static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, u8 vector) |
295 | { | |
296 | int apic, pin; | |
297 | struct irq_pin_list *entry = irq_2_pin + irq; | |
298 | ||
299 | BUG_ON(irq >= NR_IRQS); | |
300 | for (;;) { | |
301 | unsigned int reg; | |
302 | apic = entry->apic; | |
303 | pin = entry->pin; | |
304 | if (pin == -1) | |
305 | break; | |
306 | io_apic_write(apic, 0x11 + pin*2, dest); | |
307 | reg = io_apic_read(apic, 0x10 + pin*2); | |
46b3b4ef | 308 | reg &= ~IO_APIC_REDIR_VECTOR_MASK; |
550f2299 EB |
309 | reg |= vector; |
310 | io_apic_modify(apic, reg); | |
311 | if (!entry->next) | |
312 | break; | |
313 | entry = irq_2_pin + entry->next; | |
314 | } | |
315 | } | |
316 | ||
54d5d424 AR |
317 | static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask) |
318 | { | |
dfbffdd8 | 319 | struct irq_cfg *cfg = irq_cfg + irq; |
54d5d424 AR |
320 | unsigned long flags; |
321 | unsigned int dest; | |
322 | cpumask_t tmp; | |
323 | ||
324 | cpus_and(tmp, mask, cpu_online_map); | |
325 | if (cpus_empty(tmp)) | |
5ff5115e | 326 | return; |
54d5d424 | 327 | |
dfbffdd8 | 328 | if (assign_irq_vector(irq, mask)) |
550f2299 EB |
329 | return; |
330 | ||
dfbffdd8 | 331 | cpus_and(tmp, cfg->domain, mask); |
550f2299 | 332 | dest = cpu_mask_to_apicid(tmp); |
54d5d424 AR |
333 | |
334 | /* | |
335 | * Only the high 8 bits are valid. | |
336 | */ | |
337 | dest = SET_APIC_LOGICAL_ID(dest); | |
338 | ||
339 | spin_lock_irqsave(&ioapic_lock, flags); | |
dfbffdd8 | 340 | __target_IO_APIC_irq(irq, dest, cfg->vector); |
9f0a5ba5 | 341 | irq_desc[irq].affinity = mask; |
54d5d424 AR |
342 | spin_unlock_irqrestore(&ioapic_lock, flags); |
343 | } | |
344 | #endif | |
345 | ||
1da177e4 LT |
346 | /* |
347 | * The common case is 1:1 IRQ<->pin mappings. Sometimes there are | |
348 | * shared ISA-space IRQs, so we have to support them. We are super | |
349 | * fast in the common case, and fast for shared ISA-space IRQs. | |
350 | */ | |
351 | static void add_pin_to_irq(unsigned int irq, int apic, int pin) | |
352 | { | |
353 | static int first_free_entry = NR_IRQS; | |
354 | struct irq_pin_list *entry = irq_2_pin + irq; | |
355 | ||
6004e1b7 | 356 | BUG_ON(irq >= NR_IRQS); |
1da177e4 LT |
357 | while (entry->next) |
358 | entry = irq_2_pin + entry->next; | |
359 | ||
360 | if (entry->pin != -1) { | |
361 | entry->next = first_free_entry; | |
362 | entry = irq_2_pin + entry->next; | |
363 | if (++first_free_entry >= PIN_MAP_SIZE) | |
6004e1b7 | 364 | panic("io_apic.c: ran out of irq_2_pin entries!"); |
1da177e4 LT |
365 | } |
366 | entry->apic = apic; | |
367 | entry->pin = pin; | |
368 | } | |
369 | ||
0b9f4f49 MR |
370 | /* |
371 | * Reroute an IRQ to a different pin. | |
372 | */ | |
373 | static void __init replace_pin_at_irq(unsigned int irq, | |
374 | int oldapic, int oldpin, | |
375 | int newapic, int newpin) | |
376 | { | |
377 | struct irq_pin_list *entry = irq_2_pin + irq; | |
378 | ||
379 | while (1) { | |
380 | if (entry->apic == oldapic && entry->pin == oldpin) { | |
381 | entry->apic = newapic; | |
382 | entry->pin = newpin; | |
383 | } | |
384 | if (!entry->next) | |
385 | break; | |
386 | entry = irq_2_pin + entry->next; | |
387 | } | |
388 | } | |
389 | ||
1da177e4 LT |
390 | |
391 | #define DO_ACTION(name,R,ACTION, FINAL) \ | |
392 | \ | |
393 | static void name##_IO_APIC_irq (unsigned int irq) \ | |
394 | __DO_ACTION(R, ACTION, FINAL) | |
395 | ||
46b3b4ef CG |
396 | /* mask = 1 */ |
397 | DO_ACTION(__mask, 0, |= IO_APIC_REDIR_MASKED, io_apic_sync(entry->apic)) | |
398 | ||
399 | /* mask = 0 */ | |
400 | DO_ACTION(__unmask, 0, &= ~IO_APIC_REDIR_MASKED, ) | |
1da177e4 LT |
401 | |
402 | static void mask_IO_APIC_irq (unsigned int irq) | |
403 | { | |
404 | unsigned long flags; | |
405 | ||
406 | spin_lock_irqsave(&ioapic_lock, flags); | |
407 | __mask_IO_APIC_irq(irq); | |
408 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
409 | } | |
410 | ||
411 | static void unmask_IO_APIC_irq (unsigned int irq) | |
412 | { | |
413 | unsigned long flags; | |
414 | ||
415 | spin_lock_irqsave(&ioapic_lock, flags); | |
416 | __unmask_IO_APIC_irq(irq); | |
417 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
418 | } | |
419 | ||
420 | static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin) | |
421 | { | |
422 | struct IO_APIC_route_entry entry; | |
1da177e4 LT |
423 | |
424 | /* Check delivery_mode to be sure we're not clearing an SMI pin */ | |
eea0e11c | 425 | entry = ioapic_read_entry(apic, pin); |
1da177e4 LT |
426 | if (entry.delivery_mode == dest_SMI) |
427 | return; | |
428 | /* | |
429 | * Disable it in the IO-APIC irq-routing table: | |
430 | */ | |
48797ebd | 431 | ioapic_mask_entry(apic, pin); |
1da177e4 LT |
432 | } |
433 | ||
434 | static void clear_IO_APIC (void) | |
435 | { | |
436 | int apic, pin; | |
437 | ||
438 | for (apic = 0; apic < nr_ioapics; apic++) | |
439 | for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) | |
440 | clear_IO_APIC_pin(apic, pin); | |
441 | } | |
442 | ||
1da177e4 LT |
443 | int skip_ioapic_setup; |
444 | int ioapic_force; | |
445 | ||
61ec7567 | 446 | static int __init parse_noapic(char *str) |
1da177e4 | 447 | { |
61ec7567 | 448 | disable_ioapic_setup(); |
2c8c0e6b | 449 | return 0; |
1da177e4 | 450 | } |
61ec7567 | 451 | early_param("noapic", parse_noapic); |
1da177e4 | 452 | |
fea5f1e1 LT |
453 | /* Actually the next is obsolete, but keep it for paranoid reasons -AK */ |
454 | static int __init disable_timer_pin_setup(char *arg) | |
455 | { | |
456 | disable_timer_pin_1 = 1; | |
457 | return 1; | |
458 | } | |
459 | __setup("disable_timer_pin_1", disable_timer_pin_setup); | |
460 | ||
fea5f1e1 | 461 | |
1da177e4 LT |
462 | /* |
463 | * Find the IRQ entry number of a certain pin. | |
464 | */ | |
465 | static int find_irq_entry(int apic, int pin, int type) | |
466 | { | |
467 | int i; | |
468 | ||
469 | for (i = 0; i < mp_irq_entries; i++) | |
2fddb6e2 AS |
470 | if (mp_irqs[i].mp_irqtype == type && |
471 | (mp_irqs[i].mp_dstapic == mp_ioapics[apic].mp_apicid || | |
472 | mp_irqs[i].mp_dstapic == MP_APIC_ALL) && | |
473 | mp_irqs[i].mp_dstirq == pin) | |
1da177e4 LT |
474 | return i; |
475 | ||
476 | return -1; | |
477 | } | |
478 | ||
479 | /* | |
480 | * Find the pin to which IRQ[irq] (ISA) is connected | |
481 | */ | |
1008fddc | 482 | static int __init find_isa_irq_pin(int irq, int type) |
1da177e4 LT |
483 | { |
484 | int i; | |
485 | ||
486 | for (i = 0; i < mp_irq_entries; i++) { | |
2fddb6e2 | 487 | int lbus = mp_irqs[i].mp_srcbus; |
1da177e4 | 488 | |
55f05ffa | 489 | if (test_bit(lbus, mp_bus_not_pci) && |
2fddb6e2 AS |
490 | (mp_irqs[i].mp_irqtype == type) && |
491 | (mp_irqs[i].mp_srcbusirq == irq)) | |
1da177e4 | 492 | |
2fddb6e2 | 493 | return mp_irqs[i].mp_dstirq; |
1da177e4 LT |
494 | } |
495 | return -1; | |
496 | } | |
497 | ||
1008fddc EB |
498 | static int __init find_isa_irq_apic(int irq, int type) |
499 | { | |
500 | int i; | |
501 | ||
502 | for (i = 0; i < mp_irq_entries; i++) { | |
2fddb6e2 | 503 | int lbus = mp_irqs[i].mp_srcbus; |
1008fddc | 504 | |
55f05ffa | 505 | if (test_bit(lbus, mp_bus_not_pci) && |
2fddb6e2 AS |
506 | (mp_irqs[i].mp_irqtype == type) && |
507 | (mp_irqs[i].mp_srcbusirq == irq)) | |
1008fddc EB |
508 | break; |
509 | } | |
510 | if (i < mp_irq_entries) { | |
511 | int apic; | |
512 | for(apic = 0; apic < nr_ioapics; apic++) { | |
2fddb6e2 | 513 | if (mp_ioapics[apic].mp_apicid == mp_irqs[i].mp_dstapic) |
1008fddc EB |
514 | return apic; |
515 | } | |
516 | } | |
517 | ||
518 | return -1; | |
519 | } | |
520 | ||
1da177e4 LT |
521 | /* |
522 | * Find a specific PCI IRQ entry. | |
523 | * Not an __init, possibly needed by modules | |
524 | */ | |
525 | static int pin_2_irq(int idx, int apic, int pin); | |
526 | ||
527 | int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin) | |
528 | { | |
529 | int apic, i, best_guess = -1; | |
530 | ||
531 | apic_printk(APIC_DEBUG, "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n", | |
532 | bus, slot, pin); | |
ce6444d3 | 533 | if (test_bit(bus, mp_bus_not_pci)) { |
1da177e4 LT |
534 | apic_printk(APIC_VERBOSE, "PCI BIOS passed nonexistent PCI bus %d!\n", bus); |
535 | return -1; | |
536 | } | |
537 | for (i = 0; i < mp_irq_entries; i++) { | |
2fddb6e2 | 538 | int lbus = mp_irqs[i].mp_srcbus; |
1da177e4 LT |
539 | |
540 | for (apic = 0; apic < nr_ioapics; apic++) | |
2fddb6e2 AS |
541 | if (mp_ioapics[apic].mp_apicid == mp_irqs[i].mp_dstapic || |
542 | mp_irqs[i].mp_dstapic == MP_APIC_ALL) | |
1da177e4 LT |
543 | break; |
544 | ||
55f05ffa | 545 | if (!test_bit(lbus, mp_bus_not_pci) && |
2fddb6e2 | 546 | !mp_irqs[i].mp_irqtype && |
1da177e4 | 547 | (bus == lbus) && |
2fddb6e2 AS |
548 | (slot == ((mp_irqs[i].mp_srcbusirq >> 2) & 0x1f))) { |
549 | int irq = pin_2_irq(i,apic,mp_irqs[i].mp_dstirq); | |
1da177e4 LT |
550 | |
551 | if (!(apic || IO_APIC_IRQ(irq))) | |
552 | continue; | |
553 | ||
2fddb6e2 | 554 | if (pin == (mp_irqs[i].mp_srcbusirq & 3)) |
1da177e4 LT |
555 | return irq; |
556 | /* | |
557 | * Use the first all-but-pin matching entry as a | |
558 | * best-guess fuzzy result for broken mptables. | |
559 | */ | |
560 | if (best_guess < 0) | |
561 | best_guess = irq; | |
562 | } | |
563 | } | |
6004e1b7 | 564 | BUG_ON(best_guess >= NR_IRQS); |
1da177e4 LT |
565 | return best_guess; |
566 | } | |
567 | ||
1da177e4 LT |
568 | /* ISA interrupts are always polarity zero edge triggered, |
569 | * when listed as conforming in the MP table. */ | |
570 | ||
571 | #define default_ISA_trigger(idx) (0) | |
572 | #define default_ISA_polarity(idx) (0) | |
573 | ||
574 | /* PCI interrupts are always polarity one level triggered, | |
575 | * when listed as conforming in the MP table. */ | |
576 | ||
577 | #define default_PCI_trigger(idx) (1) | |
578 | #define default_PCI_polarity(idx) (1) | |
579 | ||
61fd47e0 | 580 | static int MPBIOS_polarity(int idx) |
1da177e4 | 581 | { |
2fddb6e2 | 582 | int bus = mp_irqs[idx].mp_srcbus; |
1da177e4 LT |
583 | int polarity; |
584 | ||
585 | /* | |
586 | * Determine IRQ line polarity (high active or low active): | |
587 | */ | |
2fddb6e2 | 588 | switch (mp_irqs[idx].mp_irqflag & 3) |
1da177e4 LT |
589 | { |
590 | case 0: /* conforms, ie. bus-type dependent polarity */ | |
55f05ffa AK |
591 | if (test_bit(bus, mp_bus_not_pci)) |
592 | polarity = default_ISA_polarity(idx); | |
593 | else | |
594 | polarity = default_PCI_polarity(idx); | |
1da177e4 | 595 | break; |
1da177e4 LT |
596 | case 1: /* high active */ |
597 | { | |
598 | polarity = 0; | |
599 | break; | |
600 | } | |
601 | case 2: /* reserved */ | |
602 | { | |
603 | printk(KERN_WARNING "broken BIOS!!\n"); | |
604 | polarity = 1; | |
605 | break; | |
606 | } | |
607 | case 3: /* low active */ | |
608 | { | |
609 | polarity = 1; | |
610 | break; | |
611 | } | |
612 | default: /* invalid */ | |
613 | { | |
614 | printk(KERN_WARNING "broken BIOS!!\n"); | |
615 | polarity = 1; | |
616 | break; | |
617 | } | |
618 | } | |
619 | return polarity; | |
620 | } | |
621 | ||
622 | static int MPBIOS_trigger(int idx) | |
623 | { | |
2fddb6e2 | 624 | int bus = mp_irqs[idx].mp_srcbus; |
1da177e4 LT |
625 | int trigger; |
626 | ||
627 | /* | |
628 | * Determine IRQ trigger mode (edge or level sensitive): | |
629 | */ | |
2fddb6e2 | 630 | switch ((mp_irqs[idx].mp_irqflag>>2) & 3) |
1da177e4 LT |
631 | { |
632 | case 0: /* conforms, ie. bus-type dependent */ | |
55f05ffa AK |
633 | if (test_bit(bus, mp_bus_not_pci)) |
634 | trigger = default_ISA_trigger(idx); | |
635 | else | |
636 | trigger = default_PCI_trigger(idx); | |
1da177e4 | 637 | break; |
1da177e4 LT |
638 | case 1: /* edge */ |
639 | { | |
640 | trigger = 0; | |
641 | break; | |
642 | } | |
643 | case 2: /* reserved */ | |
644 | { | |
645 | printk(KERN_WARNING "broken BIOS!!\n"); | |
646 | trigger = 1; | |
647 | break; | |
648 | } | |
649 | case 3: /* level */ | |
650 | { | |
651 | trigger = 1; | |
652 | break; | |
653 | } | |
654 | default: /* invalid */ | |
655 | { | |
656 | printk(KERN_WARNING "broken BIOS!!\n"); | |
657 | trigger = 0; | |
658 | break; | |
659 | } | |
660 | } | |
661 | return trigger; | |
662 | } | |
663 | ||
664 | static inline int irq_polarity(int idx) | |
665 | { | |
666 | return MPBIOS_polarity(idx); | |
667 | } | |
668 | ||
669 | static inline int irq_trigger(int idx) | |
670 | { | |
671 | return MPBIOS_trigger(idx); | |
672 | } | |
673 | ||
674 | static int pin_2_irq(int idx, int apic, int pin) | |
675 | { | |
676 | int irq, i; | |
2fddb6e2 | 677 | int bus = mp_irqs[idx].mp_srcbus; |
1da177e4 LT |
678 | |
679 | /* | |
680 | * Debugging check, we are in big trouble if this message pops up! | |
681 | */ | |
2fddb6e2 | 682 | if (mp_irqs[idx].mp_dstirq != pin) |
1da177e4 LT |
683 | printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n"); |
684 | ||
55f05ffa | 685 | if (test_bit(bus, mp_bus_not_pci)) { |
2fddb6e2 | 686 | irq = mp_irqs[idx].mp_srcbusirq; |
55f05ffa AK |
687 | } else { |
688 | /* | |
689 | * PCI IRQs are mapped in order | |
690 | */ | |
691 | i = irq = 0; | |
692 | while (i < apic) | |
693 | irq += nr_ioapic_registers[i++]; | |
694 | irq += pin; | |
1da177e4 | 695 | } |
6004e1b7 | 696 | BUG_ON(irq >= NR_IRQS); |
1da177e4 LT |
697 | return irq; |
698 | } | |
699 | ||
dfbffdd8 | 700 | static int __assign_irq_vector(int irq, cpumask_t mask) |
1da177e4 | 701 | { |
550f2299 EB |
702 | /* |
703 | * NOTE! The local APIC isn't very good at handling | |
704 | * multiple interrupts at the same interrupt level. | |
705 | * As the interrupt level is determined by taking the | |
706 | * vector number and shifting that right by 4, we | |
707 | * want to spread these out a bit so that they don't | |
708 | * all fall in the same interrupt level. | |
709 | * | |
710 | * Also, we've got to be careful not to trash gate | |
711 | * 0x80, because int 0x80 is hm, kind of importantish. ;) | |
712 | */ | |
d1752aa8 | 713 | static int current_vector = FIRST_DEVICE_VECTOR, current_offset = 0; |
dfbffdd8 | 714 | unsigned int old_vector; |
550f2299 | 715 | int cpu; |
13a79503 | 716 | struct irq_cfg *cfg; |
1da177e4 | 717 | |
e273d140 | 718 | BUG_ON((unsigned)irq >= NR_IRQS); |
13a79503 | 719 | cfg = &irq_cfg[irq]; |
0a1ad60d | 720 | |
70a0a535 EB |
721 | /* Only try and allocate irqs on cpus that are present */ |
722 | cpus_and(mask, mask, cpu_online_map); | |
723 | ||
61014292 EB |
724 | if ((cfg->move_in_progress) || cfg->move_cleanup_count) |
725 | return -EBUSY; | |
726 | ||
dfbffdd8 EB |
727 | old_vector = cfg->vector; |
728 | if (old_vector) { | |
729 | cpumask_t tmp; | |
730 | cpus_and(tmp, cfg->domain, mask); | |
731 | if (!cpus_empty(tmp)) | |
732 | return 0; | |
0a1ad60d | 733 | } |
550f2299 EB |
734 | |
735 | for_each_cpu_mask(cpu, mask) { | |
70a0a535 | 736 | cpumask_t domain, new_mask; |
61014292 | 737 | int new_cpu; |
550f2299 | 738 | int vector, offset; |
c7111c13 EB |
739 | |
740 | domain = vector_allocation_domain(cpu); | |
70a0a535 | 741 | cpus_and(new_mask, domain, cpu_online_map); |
c7111c13 | 742 | |
d1752aa8 EB |
743 | vector = current_vector; |
744 | offset = current_offset; | |
1da177e4 | 745 | next: |
550f2299 | 746 | vector += 8; |
305b92a2 | 747 | if (vector >= first_system_vector) { |
550f2299 EB |
748 | /* If we run out of vectors on large boxen, must share them. */ |
749 | offset = (offset + 1) % 8; | |
750 | vector = FIRST_DEVICE_VECTOR + offset; | |
751 | } | |
d1752aa8 | 752 | if (unlikely(current_vector == vector)) |
550f2299 EB |
753 | continue; |
754 | if (vector == IA32_SYSCALL_VECTOR) | |
755 | goto next; | |
70a0a535 | 756 | for_each_cpu_mask(new_cpu, new_mask) |
45edfd1d | 757 | if (per_cpu(vector_irq, new_cpu)[vector] != -1) |
c7111c13 | 758 | goto next; |
550f2299 | 759 | /* Found one! */ |
d1752aa8 EB |
760 | current_vector = vector; |
761 | current_offset = offset; | |
61014292 EB |
762 | if (old_vector) { |
763 | cfg->move_in_progress = 1; | |
764 | cfg->old_domain = cfg->domain; | |
765 | } | |
70a0a535 | 766 | for_each_cpu_mask(new_cpu, new_mask) |
c7111c13 | 767 | per_cpu(vector_irq, new_cpu)[vector] = irq; |
13a79503 EB |
768 | cfg->vector = vector; |
769 | cfg->domain = domain; | |
dfbffdd8 | 770 | return 0; |
1da177e4 | 771 | } |
550f2299 | 772 | return -ENOSPC; |
04b9267b EB |
773 | } |
774 | ||
dfbffdd8 | 775 | static int assign_irq_vector(int irq, cpumask_t mask) |
04b9267b | 776 | { |
dfbffdd8 | 777 | int err; |
04b9267b | 778 | unsigned long flags; |
0a1ad60d | 779 | |
04b9267b | 780 | spin_lock_irqsave(&vector_lock, flags); |
dfbffdd8 | 781 | err = __assign_irq_vector(irq, mask); |
26a3c49c | 782 | spin_unlock_irqrestore(&vector_lock, flags); |
dfbffdd8 | 783 | return err; |
1da177e4 LT |
784 | } |
785 | ||
5df0287e YL |
786 | static void __clear_irq_vector(int irq) |
787 | { | |
13a79503 | 788 | struct irq_cfg *cfg; |
5df0287e YL |
789 | cpumask_t mask; |
790 | int cpu, vector; | |
791 | ||
13a79503 EB |
792 | BUG_ON((unsigned)irq >= NR_IRQS); |
793 | cfg = &irq_cfg[irq]; | |
794 | BUG_ON(!cfg->vector); | |
5df0287e | 795 | |
13a79503 EB |
796 | vector = cfg->vector; |
797 | cpus_and(mask, cfg->domain, cpu_online_map); | |
5df0287e YL |
798 | for_each_cpu_mask(cpu, mask) |
799 | per_cpu(vector_irq, cpu)[vector] = -1; | |
800 | ||
13a79503 | 801 | cfg->vector = 0; |
d366f8cb | 802 | cpus_clear(cfg->domain); |
5df0287e YL |
803 | } |
804 | ||
3fde6900 | 805 | static void __setup_vector_irq(int cpu) |
70a0a535 EB |
806 | { |
807 | /* Initialize vector_irq on a new cpu */ | |
808 | /* This function must be called with vector_lock held */ | |
70a0a535 EB |
809 | int irq, vector; |
810 | ||
70a0a535 | 811 | /* Mark the inuse vectors */ |
e273d140 | 812 | for (irq = 0; irq < NR_IRQS; ++irq) { |
13a79503 | 813 | if (!cpu_isset(cpu, irq_cfg[irq].domain)) |
70a0a535 | 814 | continue; |
13a79503 | 815 | vector = irq_cfg[irq].vector; |
70a0a535 EB |
816 | per_cpu(vector_irq, cpu)[vector] = irq; |
817 | } | |
818 | /* Mark the free vectors */ | |
819 | for (vector = 0; vector < NR_VECTORS; ++vector) { | |
820 | irq = per_cpu(vector_irq, cpu)[vector]; | |
821 | if (irq < 0) | |
822 | continue; | |
13a79503 | 823 | if (!cpu_isset(cpu, irq_cfg[irq].domain)) |
70a0a535 EB |
824 | per_cpu(vector_irq, cpu)[vector] = -1; |
825 | } | |
826 | } | |
827 | ||
3fde6900 GC |
828 | void setup_vector_irq(int cpu) |
829 | { | |
830 | spin_lock(&vector_lock); | |
831 | __setup_vector_irq(smp_processor_id()); | |
832 | spin_unlock(&vector_lock); | |
833 | } | |
834 | ||
70a0a535 | 835 | |
f29bd1ba | 836 | static struct irq_chip ioapic_chip; |
1da177e4 | 837 | |
a27bc06d | 838 | static void ioapic_register_intr(int irq, unsigned long trigger) |
1da177e4 | 839 | { |
cc75b92d TG |
840 | if (trigger) { |
841 | irq_desc[irq].status |= IRQ_LEVEL; | |
a460e745 IM |
842 | set_irq_chip_and_handler_name(irq, &ioapic_chip, |
843 | handle_fasteoi_irq, "fasteoi"); | |
cc75b92d TG |
844 | } else { |
845 | irq_desc[irq].status &= ~IRQ_LEVEL; | |
a460e745 IM |
846 | set_irq_chip_and_handler_name(irq, &ioapic_chip, |
847 | handle_edge_irq, "edge"); | |
cc75b92d | 848 | } |
1da177e4 | 849 | } |
a8c8a367 EB |
850 | |
851 | static void setup_IO_APIC_irq(int apic, int pin, unsigned int irq, | |
852 | int trigger, int polarity) | |
1da177e4 | 853 | { |
dfbffdd8 | 854 | struct irq_cfg *cfg = irq_cfg + irq; |
1da177e4 | 855 | struct IO_APIC_route_entry entry; |
a8c8a367 | 856 | cpumask_t mask; |
1da177e4 | 857 | |
a8c8a367 EB |
858 | if (!IO_APIC_IRQ(irq)) |
859 | return; | |
860 | ||
dfbffdd8 EB |
861 | mask = TARGET_CPUS; |
862 | if (assign_irq_vector(irq, mask)) | |
a8c8a367 EB |
863 | return; |
864 | ||
dfbffdd8 EB |
865 | cpus_and(mask, cfg->domain, mask); |
866 | ||
a8c8a367 EB |
867 | apic_printk(APIC_VERBOSE,KERN_DEBUG |
868 | "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> " | |
869 | "IRQ %d Mode:%i Active:%i)\n", | |
ec2cd0a2 | 870 | apic, mp_ioapics[apic].mp_apicid, pin, cfg->vector, |
a8c8a367 | 871 | irq, trigger, polarity); |
1da177e4 | 872 | |
ad892f5e YL |
873 | /* |
874 | * add it to the IO-APIC irq-routing table: | |
875 | */ | |
876 | memset(&entry,0,sizeof(entry)); | |
1da177e4 | 877 | |
ad892f5e YL |
878 | entry.delivery_mode = INT_DELIVERY_MODE; |
879 | entry.dest_mode = INT_DEST_MODE; | |
a8c8a367 | 880 | entry.dest = cpu_mask_to_apicid(mask); |
ad892f5e | 881 | entry.mask = 0; /* enable IRQ */ |
a8c8a367 EB |
882 | entry.trigger = trigger; |
883 | entry.polarity = polarity; | |
dfbffdd8 | 884 | entry.vector = cfg->vector; |
1da177e4 | 885 | |
a8c8a367 EB |
886 | /* Mask level triggered irqs. |
887 | * Use IRQ_DELAYED_DISABLE for edge triggered irqs. | |
888 | */ | |
889 | if (trigger) | |
ad892f5e | 890 | entry.mask = 1; |
ad892f5e | 891 | |
a8c8a367 EB |
892 | ioapic_register_intr(irq, trigger); |
893 | if (irq < 16) | |
894 | disable_8259A_irq(irq); | |
ad892f5e YL |
895 | |
896 | ioapic_write_entry(apic, pin, entry); | |
ad892f5e YL |
897 | } |
898 | ||
899 | static void __init setup_IO_APIC_irqs(void) | |
900 | { | |
901 | int apic, pin, idx, irq, first_notcon = 1; | |
902 | ||
903 | apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n"); | |
904 | ||
905 | for (apic = 0; apic < nr_ioapics; apic++) { | |
906 | for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) { | |
1da177e4 LT |
907 | |
908 | idx = find_irq_entry(apic,pin,mp_INT); | |
909 | if (idx == -1) { | |
910 | if (first_notcon) { | |
ec2cd0a2 | 911 | apic_printk(APIC_VERBOSE, KERN_DEBUG " IO-APIC (apicid-pin) %d-%d", mp_ioapics[apic].mp_apicid, pin); |
1da177e4 LT |
912 | first_notcon = 0; |
913 | } else | |
ec2cd0a2 | 914 | apic_printk(APIC_VERBOSE, ", %d-%d", mp_ioapics[apic].mp_apicid, pin); |
1da177e4 LT |
915 | continue; |
916 | } | |
20d225b9 YL |
917 | if (!first_notcon) { |
918 | apic_printk(APIC_VERBOSE, " not connected.\n"); | |
919 | first_notcon = 1; | |
920 | } | |
1da177e4 | 921 | |
1da177e4 LT |
922 | irq = pin_2_irq(idx, apic, pin); |
923 | add_pin_to_irq(irq, apic, pin); | |
924 | ||
a8c8a367 EB |
925 | setup_IO_APIC_irq(apic, pin, irq, |
926 | irq_trigger(idx), irq_polarity(idx)); | |
1da177e4 LT |
927 | } |
928 | } | |
929 | ||
930 | if (!first_notcon) | |
20d225b9 | 931 | apic_printk(APIC_VERBOSE, " not connected.\n"); |
1da177e4 LT |
932 | } |
933 | ||
934 | /* | |
f7633ce5 | 935 | * Set up the timer pin, possibly with the 8259A-master behind. |
1da177e4 | 936 | */ |
f7633ce5 MR |
937 | static void __init setup_timer_IRQ0_pin(unsigned int apic, unsigned int pin, |
938 | int vector) | |
1da177e4 LT |
939 | { |
940 | struct IO_APIC_route_entry entry; | |
1da177e4 | 941 | |
a2249cba | 942 | memset(&entry, 0, sizeof(entry)); |
1da177e4 | 943 | |
1da177e4 LT |
944 | /* |
945 | * We use logical delivery to get the timer IRQ | |
946 | * to the first CPU. | |
947 | */ | |
948 | entry.dest_mode = INT_DEST_MODE; | |
03be7505 | 949 | entry.mask = 1; /* mask IRQ now */ |
ee4eff6f | 950 | entry.dest = cpu_mask_to_apicid(TARGET_CPUS); |
1da177e4 LT |
951 | entry.delivery_mode = INT_DELIVERY_MODE; |
952 | entry.polarity = 0; | |
953 | entry.trigger = 0; | |
954 | entry.vector = vector; | |
955 | ||
956 | /* | |
957 | * The timer IRQ doesn't have to know that behind the | |
f7633ce5 | 958 | * scene we may have a 8259A-master in AEOI mode ... |
1da177e4 | 959 | */ |
a460e745 | 960 | set_irq_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq, "edge"); |
1da177e4 LT |
961 | |
962 | /* | |
963 | * Add it to the IO-APIC irq-routing table: | |
964 | */ | |
a2249cba | 965 | ioapic_write_entry(apic, pin, entry); |
1da177e4 LT |
966 | } |
967 | ||
1da177e4 LT |
968 | void __apicdebuginit print_IO_APIC(void) |
969 | { | |
970 | int apic, i; | |
971 | union IO_APIC_reg_00 reg_00; | |
972 | union IO_APIC_reg_01 reg_01; | |
973 | union IO_APIC_reg_02 reg_02; | |
974 | unsigned long flags; | |
975 | ||
976 | if (apic_verbosity == APIC_QUIET) | |
977 | return; | |
978 | ||
979 | printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries); | |
980 | for (i = 0; i < nr_ioapics; i++) | |
981 | printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n", | |
ec2cd0a2 | 982 | mp_ioapics[i].mp_apicid, nr_ioapic_registers[i]); |
1da177e4 LT |
983 | |
984 | /* | |
985 | * We are a bit conservative about what we expect. We have to | |
986 | * know about every hardware change ASAP. | |
987 | */ | |
988 | printk(KERN_INFO "testing the IO APIC.......................\n"); | |
989 | ||
990 | for (apic = 0; apic < nr_ioapics; apic++) { | |
991 | ||
992 | spin_lock_irqsave(&ioapic_lock, flags); | |
993 | reg_00.raw = io_apic_read(apic, 0); | |
994 | reg_01.raw = io_apic_read(apic, 1); | |
995 | if (reg_01.bits.version >= 0x10) | |
996 | reg_02.raw = io_apic_read(apic, 2); | |
997 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
998 | ||
999 | printk("\n"); | |
ec2cd0a2 | 1000 | printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].mp_apicid); |
1da177e4 LT |
1001 | printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw); |
1002 | printk(KERN_DEBUG "....... : physical APIC id: %02X\n", reg_00.bits.ID); | |
1da177e4 LT |
1003 | |
1004 | printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)®_01); | |
1005 | printk(KERN_DEBUG "....... : max redirection entries: %04X\n", reg_01.bits.entries); | |
1da177e4 LT |
1006 | |
1007 | printk(KERN_DEBUG "....... : PRQ implemented: %X\n", reg_01.bits.PRQ); | |
1008 | printk(KERN_DEBUG "....... : IO APIC version: %04X\n", reg_01.bits.version); | |
1da177e4 LT |
1009 | |
1010 | if (reg_01.bits.version >= 0x10) { | |
1011 | printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw); | |
1012 | printk(KERN_DEBUG "....... : arbitration: %02X\n", reg_02.bits.arbitration); | |
1da177e4 LT |
1013 | } |
1014 | ||
1015 | printk(KERN_DEBUG ".... IRQ redirection table:\n"); | |
1016 | ||
ee4eff6f BR |
1017 | printk(KERN_DEBUG " NR Dst Mask Trig IRR Pol" |
1018 | " Stat Dmod Deli Vect: \n"); | |
1da177e4 LT |
1019 | |
1020 | for (i = 0; i <= reg_01.bits.entries; i++) { | |
1021 | struct IO_APIC_route_entry entry; | |
1022 | ||
eea0e11c | 1023 | entry = ioapic_read_entry(apic, i); |
1da177e4 | 1024 | |
ee4eff6f | 1025 | printk(KERN_DEBUG " %02x %03X ", |
1da177e4 | 1026 | i, |
ee4eff6f | 1027 | entry.dest |
1da177e4 LT |
1028 | ); |
1029 | ||
1030 | printk("%1d %1d %1d %1d %1d %1d %1d %02X\n", | |
1031 | entry.mask, | |
1032 | entry.trigger, | |
1033 | entry.irr, | |
1034 | entry.polarity, | |
1035 | entry.delivery_status, | |
1036 | entry.dest_mode, | |
1037 | entry.delivery_mode, | |
1038 | entry.vector | |
1039 | ); | |
1040 | } | |
1041 | } | |
1da177e4 LT |
1042 | printk(KERN_DEBUG "IRQ to pin mappings:\n"); |
1043 | for (i = 0; i < NR_IRQS; i++) { | |
1044 | struct irq_pin_list *entry = irq_2_pin + i; | |
1045 | if (entry->pin < 0) | |
1046 | continue; | |
04b9267b | 1047 | printk(KERN_DEBUG "IRQ%d ", i); |
1da177e4 LT |
1048 | for (;;) { |
1049 | printk("-> %d:%d", entry->apic, entry->pin); | |
1050 | if (!entry->next) | |
1051 | break; | |
1052 | entry = irq_2_pin + entry->next; | |
1053 | } | |
1054 | printk("\n"); | |
1055 | } | |
1056 | ||
1057 | printk(KERN_INFO ".................................... done.\n"); | |
1058 | ||
1059 | return; | |
1060 | } | |
1061 | ||
1062 | #if 0 | |
1063 | ||
1064 | static __apicdebuginit void print_APIC_bitfield (int base) | |
1065 | { | |
1066 | unsigned int v; | |
1067 | int i, j; | |
1068 | ||
1069 | if (apic_verbosity == APIC_QUIET) | |
1070 | return; | |
1071 | ||
1072 | printk(KERN_DEBUG "0123456789abcdef0123456789abcdef\n" KERN_DEBUG); | |
1073 | for (i = 0; i < 8; i++) { | |
1074 | v = apic_read(base + i*0x10); | |
1075 | for (j = 0; j < 32; j++) { | |
1076 | if (v & (1<<j)) | |
1077 | printk("1"); | |
1078 | else | |
1079 | printk("0"); | |
1080 | } | |
1081 | printk("\n"); | |
1082 | } | |
1083 | } | |
1084 | ||
1085 | void __apicdebuginit print_local_APIC(void * dummy) | |
1086 | { | |
1087 | unsigned int v, ver, maxlvt; | |
1088 | ||
1089 | if (apic_verbosity == APIC_QUIET) | |
1090 | return; | |
1091 | ||
1092 | printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n", | |
1093 | smp_processor_id(), hard_smp_processor_id()); | |
66823114 | 1094 | v = apic_read(APIC_ID); |
05f2d12c | 1095 | printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v, GET_APIC_ID(read_apic_id())); |
1da177e4 LT |
1096 | v = apic_read(APIC_LVR); |
1097 | printk(KERN_INFO "... APIC VERSION: %08x\n", v); | |
1098 | ver = GET_APIC_VERSION(v); | |
37e650c7 | 1099 | maxlvt = lapic_get_maxlvt(); |
1da177e4 LT |
1100 | |
1101 | v = apic_read(APIC_TASKPRI); | |
1102 | printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK); | |
1103 | ||
5a40b7c2 AK |
1104 | v = apic_read(APIC_ARBPRI); |
1105 | printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v, | |
1106 | v & APIC_ARBPRI_MASK); | |
1107 | v = apic_read(APIC_PROCPRI); | |
1108 | printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v); | |
1da177e4 LT |
1109 | |
1110 | v = apic_read(APIC_EOI); | |
1111 | printk(KERN_DEBUG "... APIC EOI: %08x\n", v); | |
1112 | v = apic_read(APIC_RRR); | |
1113 | printk(KERN_DEBUG "... APIC RRR: %08x\n", v); | |
1114 | v = apic_read(APIC_LDR); | |
1115 | printk(KERN_DEBUG "... APIC LDR: %08x\n", v); | |
1116 | v = apic_read(APIC_DFR); | |
1117 | printk(KERN_DEBUG "... APIC DFR: %08x\n", v); | |
1118 | v = apic_read(APIC_SPIV); | |
1119 | printk(KERN_DEBUG "... APIC SPIV: %08x\n", v); | |
1120 | ||
1121 | printk(KERN_DEBUG "... APIC ISR field:\n"); | |
1122 | print_APIC_bitfield(APIC_ISR); | |
1123 | printk(KERN_DEBUG "... APIC TMR field:\n"); | |
1124 | print_APIC_bitfield(APIC_TMR); | |
1125 | printk(KERN_DEBUG "... APIC IRR field:\n"); | |
1126 | print_APIC_bitfield(APIC_IRR); | |
1127 | ||
5a40b7c2 AK |
1128 | v = apic_read(APIC_ESR); |
1129 | printk(KERN_DEBUG "... APIC ESR: %08x\n", v); | |
1da177e4 LT |
1130 | |
1131 | v = apic_read(APIC_ICR); | |
1132 | printk(KERN_DEBUG "... APIC ICR: %08x\n", v); | |
1133 | v = apic_read(APIC_ICR2); | |
1134 | printk(KERN_DEBUG "... APIC ICR2: %08x\n", v); | |
1135 | ||
1136 | v = apic_read(APIC_LVTT); | |
1137 | printk(KERN_DEBUG "... APIC LVTT: %08x\n", v); | |
1138 | ||
1139 | if (maxlvt > 3) { /* PC is LVT#4. */ | |
1140 | v = apic_read(APIC_LVTPC); | |
1141 | printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v); | |
1142 | } | |
1143 | v = apic_read(APIC_LVT0); | |
1144 | printk(KERN_DEBUG "... APIC LVT0: %08x\n", v); | |
1145 | v = apic_read(APIC_LVT1); | |
1146 | printk(KERN_DEBUG "... APIC LVT1: %08x\n", v); | |
1147 | ||
1148 | if (maxlvt > 2) { /* ERR is LVT#3. */ | |
1149 | v = apic_read(APIC_LVTERR); | |
1150 | printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v); | |
1151 | } | |
1152 | ||
1153 | v = apic_read(APIC_TMICT); | |
1154 | printk(KERN_DEBUG "... APIC TMICT: %08x\n", v); | |
1155 | v = apic_read(APIC_TMCCT); | |
1156 | printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v); | |
1157 | v = apic_read(APIC_TDCR); | |
1158 | printk(KERN_DEBUG "... APIC TDCR: %08x\n", v); | |
1159 | printk("\n"); | |
1160 | } | |
1161 | ||
1162 | void print_all_local_APICs (void) | |
1163 | { | |
15c8b6c1 | 1164 | on_each_cpu(print_local_APIC, NULL, 1); |
1da177e4 LT |
1165 | } |
1166 | ||
1167 | void __apicdebuginit print_PIC(void) | |
1168 | { | |
1da177e4 LT |
1169 | unsigned int v; |
1170 | unsigned long flags; | |
1171 | ||
1172 | if (apic_verbosity == APIC_QUIET) | |
1173 | return; | |
1174 | ||
1175 | printk(KERN_DEBUG "\nprinting PIC contents\n"); | |
1176 | ||
1177 | spin_lock_irqsave(&i8259A_lock, flags); | |
1178 | ||
1179 | v = inb(0xa1) << 8 | inb(0x21); | |
1180 | printk(KERN_DEBUG "... PIC IMR: %04x\n", v); | |
1181 | ||
1182 | v = inb(0xa0) << 8 | inb(0x20); | |
1183 | printk(KERN_DEBUG "... PIC IRR: %04x\n", v); | |
1184 | ||
1185 | outb(0x0b,0xa0); | |
1186 | outb(0x0b,0x20); | |
1187 | v = inb(0xa0) << 8 | inb(0x20); | |
1188 | outb(0x0a,0xa0); | |
1189 | outb(0x0a,0x20); | |
1190 | ||
1191 | spin_unlock_irqrestore(&i8259A_lock, flags); | |
1192 | ||
1193 | printk(KERN_DEBUG "... PIC ISR: %04x\n", v); | |
1194 | ||
1195 | v = inb(0x4d1) << 8 | inb(0x4d0); | |
1196 | printk(KERN_DEBUG "... PIC ELCR: %04x\n", v); | |
1197 | } | |
1198 | ||
1199 | #endif /* 0 */ | |
1200 | ||
1c69524c | 1201 | void __init enable_IO_APIC(void) |
1da177e4 LT |
1202 | { |
1203 | union IO_APIC_reg_01 reg_01; | |
1008fddc EB |
1204 | int i8259_apic, i8259_pin; |
1205 | int i, apic; | |
1da177e4 LT |
1206 | unsigned long flags; |
1207 | ||
1208 | for (i = 0; i < PIN_MAP_SIZE; i++) { | |
1209 | irq_2_pin[i].pin = -1; | |
1210 | irq_2_pin[i].next = 0; | |
1211 | } | |
1da177e4 LT |
1212 | |
1213 | /* | |
1214 | * The number of IO-APIC IRQ registers (== #pins): | |
1215 | */ | |
1008fddc | 1216 | for (apic = 0; apic < nr_ioapics; apic++) { |
1da177e4 | 1217 | spin_lock_irqsave(&ioapic_lock, flags); |
1008fddc | 1218 | reg_01.raw = io_apic_read(apic, 1); |
1da177e4 | 1219 | spin_unlock_irqrestore(&ioapic_lock, flags); |
1008fddc EB |
1220 | nr_ioapic_registers[apic] = reg_01.bits.entries+1; |
1221 | } | |
1222 | for(apic = 0; apic < nr_ioapics; apic++) { | |
1223 | int pin; | |
1224 | /* See if any of the pins is in ExtINT mode */ | |
1225 | for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) { | |
1226 | struct IO_APIC_route_entry entry; | |
eea0e11c | 1227 | entry = ioapic_read_entry(apic, pin); |
1008fddc EB |
1228 | |
1229 | /* If the interrupt line is enabled and in ExtInt mode | |
1230 | * I have found the pin where the i8259 is connected. | |
1231 | */ | |
1232 | if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) { | |
1233 | ioapic_i8259.apic = apic; | |
1234 | ioapic_i8259.pin = pin; | |
1235 | goto found_i8259; | |
1236 | } | |
1237 | } | |
1238 | } | |
1239 | found_i8259: | |
1240 | /* Look to see what if the MP table has reported the ExtINT */ | |
1241 | i8259_pin = find_isa_irq_pin(0, mp_ExtINT); | |
1242 | i8259_apic = find_isa_irq_apic(0, mp_ExtINT); | |
1243 | /* Trust the MP table if nothing is setup in the hardware */ | |
1244 | if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) { | |
1245 | printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n"); | |
1246 | ioapic_i8259.pin = i8259_pin; | |
1247 | ioapic_i8259.apic = i8259_apic; | |
1248 | } | |
1249 | /* Complain if the MP table and the hardware disagree */ | |
1250 | if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) && | |
1251 | (i8259_pin >= 0) && (ioapic_i8259.pin >= 0)) | |
1252 | { | |
1253 | printk(KERN_WARNING "ExtINT in hardware and MP table differ\n"); | |
1da177e4 LT |
1254 | } |
1255 | ||
1256 | /* | |
1257 | * Do not trust the IO-APIC being empty at bootup | |
1258 | */ | |
1259 | clear_IO_APIC(); | |
1260 | } | |
1261 | ||
1262 | /* | |
1263 | * Not an __init, needed by the reboot code | |
1264 | */ | |
1265 | void disable_IO_APIC(void) | |
1266 | { | |
1267 | /* | |
1268 | * Clear the IO-APIC before rebooting: | |
1269 | */ | |
1270 | clear_IO_APIC(); | |
1271 | ||
208fb931 | 1272 | /* |
0b968d23 | 1273 | * If the i8259 is routed through an IOAPIC |
208fb931 | 1274 | * Put that IOAPIC in virtual wire mode |
0b968d23 | 1275 | * so legacy interrupts can be delivered. |
208fb931 | 1276 | */ |
1008fddc | 1277 | if (ioapic_i8259.pin != -1) { |
208fb931 | 1278 | struct IO_APIC_route_entry entry; |
208fb931 EB |
1279 | |
1280 | memset(&entry, 0, sizeof(entry)); | |
1281 | entry.mask = 0; /* Enabled */ | |
1282 | entry.trigger = 0; /* Edge */ | |
1283 | entry.irr = 0; | |
1284 | entry.polarity = 0; /* High */ | |
1285 | entry.delivery_status = 0; | |
1286 | entry.dest_mode = 0; /* Physical */ | |
1008fddc | 1287 | entry.delivery_mode = dest_ExtINT; /* ExtInt */ |
208fb931 | 1288 | entry.vector = 0; |
05f2d12c | 1289 | entry.dest = GET_APIC_ID(read_apic_id()); |
208fb931 | 1290 | |
208fb931 EB |
1291 | /* |
1292 | * Add it to the IO-APIC irq-routing table: | |
1293 | */ | |
eea0e11c | 1294 | ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry); |
208fb931 EB |
1295 | } |
1296 | ||
1008fddc | 1297 | disconnect_bsp_APIC(ioapic_i8259.pin != -1); |
1da177e4 LT |
1298 | } |
1299 | ||
1da177e4 LT |
1300 | /* |
1301 | * There is a nasty bug in some older SMP boards, their mptable lies | |
1302 | * about the timer IRQ. We do the following to work around the situation: | |
1303 | * | |
1304 | * - timer IRQ defaults to IO-APIC IRQ | |
1305 | * - if this function detects that timer IRQs are defunct, then we fall | |
1306 | * back to ISA timer IRQs | |
1307 | */ | |
1308 | static int __init timer_irq_works(void) | |
1309 | { | |
1310 | unsigned long t1 = jiffies; | |
4aae0702 | 1311 | unsigned long flags; |
1da177e4 | 1312 | |
4aae0702 | 1313 | local_save_flags(flags); |
1da177e4 LT |
1314 | local_irq_enable(); |
1315 | /* Let ten ticks pass... */ | |
1316 | mdelay((10 * 1000) / HZ); | |
4aae0702 | 1317 | local_irq_restore(flags); |
1da177e4 LT |
1318 | |
1319 | /* | |
1320 | * Expect a few ticks at least, to be sure some possible | |
1321 | * glue logic does not lock up after one or two first | |
1322 | * ticks in a non-ExtINT mode. Also the local APIC | |
1323 | * might have cached one ExtINT interrupt. Finally, at | |
1324 | * least one tick may be lost due to delays. | |
1325 | */ | |
1326 | ||
1327 | /* jiffies wrap? */ | |
1d16b53e | 1328 | if (time_after(jiffies, t1 + 4)) |
1da177e4 LT |
1329 | return 1; |
1330 | return 0; | |
1331 | } | |
1332 | ||
1333 | /* | |
1334 | * In the SMP+IOAPIC case it might happen that there are an unspecified | |
1335 | * number of pending IRQ events unhandled. These cases are very rare, | |
1336 | * so we 'resend' these IRQs via IPIs, to the same CPU. It's much | |
1337 | * better to do it this way as thus we do not have to be aware of | |
1338 | * 'pending' interrupts in the IRQ path, except at this point. | |
1339 | */ | |
1340 | /* | |
1341 | * Edge triggered needs to resend any interrupt | |
1342 | * that was delayed but this is now handled in the device | |
1343 | * independent code. | |
1344 | */ | |
1345 | ||
1346 | /* | |
1347 | * Starting up a edge-triggered IO-APIC interrupt is | |
1348 | * nasty - we need to make sure that we get the edge. | |
1349 | * If it is already asserted for some reason, we need | |
1350 | * return 1 to indicate that is was pending. | |
1351 | * | |
1352 | * This is not complete - we should be able to fake | |
1353 | * an edge even if it isn't on the 8259A... | |
1354 | */ | |
1355 | ||
f29bd1ba | 1356 | static unsigned int startup_ioapic_irq(unsigned int irq) |
1da177e4 LT |
1357 | { |
1358 | int was_pending = 0; | |
1359 | unsigned long flags; | |
1360 | ||
1361 | spin_lock_irqsave(&ioapic_lock, flags); | |
1362 | if (irq < 16) { | |
1363 | disable_8259A_irq(irq); | |
1364 | if (i8259A_irq_pending(irq)) | |
1365 | was_pending = 1; | |
1366 | } | |
1367 | __unmask_IO_APIC_irq(irq); | |
1368 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
1369 | ||
1370 | return was_pending; | |
1371 | } | |
1372 | ||
04b9267b | 1373 | static int ioapic_retrigger_irq(unsigned int irq) |
c0ad90a3 | 1374 | { |
13a79503 | 1375 | struct irq_cfg *cfg = &irq_cfg[irq]; |
550f2299 | 1376 | cpumask_t mask; |
6bf2dafa | 1377 | unsigned long flags; |
550f2299 | 1378 | |
6bf2dafa | 1379 | spin_lock_irqsave(&vector_lock, flags); |
7281c96f | 1380 | mask = cpumask_of_cpu(first_cpu(cfg->domain)); |
13a79503 | 1381 | send_IPI_mask(mask, cfg->vector); |
6bf2dafa | 1382 | spin_unlock_irqrestore(&vector_lock, flags); |
c0ad90a3 IM |
1383 | |
1384 | return 1; | |
1385 | } | |
1386 | ||
1da177e4 LT |
1387 | /* |
1388 | * Level and edge triggered IO-APIC interrupts need different handling, | |
1389 | * so we use two separate IRQ descriptors. Edge triggered IRQs can be | |
1390 | * handled with the level-triggered descriptor, but that one has slightly | |
1391 | * more overhead. Level-triggered interrupts cannot be handled with the | |
1392 | * edge-triggered handler, without risking IRQ storms and other ugly | |
1393 | * races. | |
1394 | */ | |
1395 | ||
61014292 EB |
1396 | #ifdef CONFIG_SMP |
1397 | asmlinkage void smp_irq_move_cleanup_interrupt(void) | |
1398 | { | |
1399 | unsigned vector, me; | |
1400 | ack_APIC_irq(); | |
1401 | exit_idle(); | |
1402 | irq_enter(); | |
1403 | ||
1404 | me = smp_processor_id(); | |
1405 | for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) { | |
1406 | unsigned int irq; | |
1407 | struct irq_desc *desc; | |
1408 | struct irq_cfg *cfg; | |
1409 | irq = __get_cpu_var(vector_irq)[vector]; | |
1410 | if (irq >= NR_IRQS) | |
1411 | continue; | |
1412 | ||
1413 | desc = irq_desc + irq; | |
1414 | cfg = irq_cfg + irq; | |
1415 | spin_lock(&desc->lock); | |
1416 | if (!cfg->move_cleanup_count) | |
1417 | goto unlock; | |
1418 | ||
1419 | if ((vector == cfg->vector) && cpu_isset(me, cfg->domain)) | |
1420 | goto unlock; | |
1421 | ||
1422 | __get_cpu_var(vector_irq)[vector] = -1; | |
1423 | cfg->move_cleanup_count--; | |
1424 | unlock: | |
1425 | spin_unlock(&desc->lock); | |
1426 | } | |
1427 | ||
1428 | irq_exit(); | |
1429 | } | |
1430 | ||
1431 | static void irq_complete_move(unsigned int irq) | |
1432 | { | |
1433 | struct irq_cfg *cfg = irq_cfg + irq; | |
1434 | unsigned vector, me; | |
1435 | ||
1436 | if (likely(!cfg->move_in_progress)) | |
1437 | return; | |
1438 | ||
65ea5b03 | 1439 | vector = ~get_irq_regs()->orig_ax; |
61014292 | 1440 | me = smp_processor_id(); |
f0e13ae7 | 1441 | if ((vector == cfg->vector) && cpu_isset(me, cfg->domain)) { |
61014292 EB |
1442 | cpumask_t cleanup_mask; |
1443 | ||
1444 | cpus_and(cleanup_mask, cfg->old_domain, cpu_online_map); | |
1445 | cfg->move_cleanup_count = cpus_weight(cleanup_mask); | |
1446 | send_IPI_mask(cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR); | |
1447 | cfg->move_in_progress = 0; | |
1448 | } | |
1449 | } | |
1450 | #else | |
1451 | static inline void irq_complete_move(unsigned int irq) {} | |
1452 | #endif | |
1453 | ||
0be6652f EB |
1454 | static void ack_apic_edge(unsigned int irq) |
1455 | { | |
61014292 | 1456 | irq_complete_move(irq); |
0be6652f EB |
1457 | move_native_irq(irq); |
1458 | ack_APIC_irq(); | |
1459 | } | |
1460 | ||
1461 | static void ack_apic_level(unsigned int irq) | |
1462 | { | |
1463 | int do_unmask_irq = 0; | |
1464 | ||
61014292 | 1465 | irq_complete_move(irq); |
52e3d90d | 1466 | #ifdef CONFIG_GENERIC_PENDING_IRQ |
0be6652f EB |
1467 | /* If we are moving the irq we need to mask it */ |
1468 | if (unlikely(irq_desc[irq].status & IRQ_MOVE_PENDING)) { | |
1469 | do_unmask_irq = 1; | |
1470 | mask_IO_APIC_irq(irq); | |
1471 | } | |
1472 | #endif | |
1473 | ||
1474 | /* | |
1475 | * We must acknowledge the irq before we move it or the acknowledge will | |
beb7dd86 | 1476 | * not propagate properly. |
0be6652f EB |
1477 | */ |
1478 | ack_APIC_irq(); | |
1479 | ||
1480 | /* Now we can move and renable the irq */ | |
ef3e28c5 EB |
1481 | if (unlikely(do_unmask_irq)) { |
1482 | /* Only migrate the irq if the ack has been received. | |
1483 | * | |
1484 | * On rare occasions the broadcast level triggered ack gets | |
1485 | * delayed going to ioapics, and if we reprogram the | |
1486 | * vector while Remote IRR is still set the irq will never | |
1487 | * fire again. | |
1488 | * | |
1489 | * To prevent this scenario we read the Remote IRR bit | |
1490 | * of the ioapic. This has two effects. | |
1491 | * - On any sane system the read of the ioapic will | |
1492 | * flush writes (and acks) going to the ioapic from | |
1493 | * this cpu. | |
1494 | * - We get to see if the ACK has actually been delivered. | |
1495 | * | |
1496 | * Based on failed experiments of reprogramming the | |
1497 | * ioapic entry from outside of irq context starting | |
1498 | * with masking the ioapic entry and then polling until | |
1499 | * Remote IRR was clear before reprogramming the | |
1500 | * ioapic I don't trust the Remote IRR bit to be | |
1501 | * completey accurate. | |
1502 | * | |
1503 | * However there appears to be no other way to plug | |
1504 | * this race, so if the Remote IRR bit is not | |
1505 | * accurate and is causing problems then it is a hardware bug | |
1506 | * and you can go talk to the chipset vendor about it. | |
1507 | */ | |
1508 | if (!io_apic_level_ack_pending(irq)) | |
1509 | move_masked_irq(irq); | |
0be6652f | 1510 | unmask_IO_APIC_irq(irq); |
ef3e28c5 | 1511 | } |
0be6652f EB |
1512 | } |
1513 | ||
f29bd1ba IM |
1514 | static struct irq_chip ioapic_chip __read_mostly = { |
1515 | .name = "IO-APIC", | |
04b9267b EB |
1516 | .startup = startup_ioapic_irq, |
1517 | .mask = mask_IO_APIC_irq, | |
1518 | .unmask = unmask_IO_APIC_irq, | |
0be6652f EB |
1519 | .ack = ack_apic_edge, |
1520 | .eoi = ack_apic_level, | |
54d5d424 | 1521 | #ifdef CONFIG_SMP |
04b9267b | 1522 | .set_affinity = set_ioapic_affinity_irq, |
54d5d424 | 1523 | #endif |
04b9267b | 1524 | .retrigger = ioapic_retrigger_irq, |
1da177e4 LT |
1525 | }; |
1526 | ||
1527 | static inline void init_IO_APIC_traps(void) | |
1528 | { | |
1529 | int irq; | |
1530 | ||
1531 | /* | |
1532 | * NOTE! The local APIC isn't very good at handling | |
1533 | * multiple interrupts at the same interrupt level. | |
1534 | * As the interrupt level is determined by taking the | |
1535 | * vector number and shifting that right by 4, we | |
1536 | * want to spread these out a bit so that they don't | |
1537 | * all fall in the same interrupt level. | |
1538 | * | |
1539 | * Also, we've got to be careful not to trash gate | |
1540 | * 0x80, because int 0x80 is hm, kind of importantish. ;) | |
1541 | */ | |
1542 | for (irq = 0; irq < NR_IRQS ; irq++) { | |
addfc66b | 1543 | if (IO_APIC_IRQ(irq) && !irq_cfg[irq].vector) { |
1da177e4 LT |
1544 | /* |
1545 | * Hmm.. We don't have an entry for this, | |
1546 | * so default to an old-fashioned 8259 | |
1547 | * interrupt if we can.. | |
1548 | */ | |
1549 | if (irq < 16) | |
1550 | make_8259A_irq(irq); | |
1551 | else | |
1552 | /* Strange. Oh, well.. */ | |
f29bd1ba | 1553 | irq_desc[irq].chip = &no_irq_chip; |
1da177e4 LT |
1554 | } |
1555 | } | |
1556 | } | |
1557 | ||
c88ac1df | 1558 | static void unmask_lapic_irq(unsigned int irq) |
1da177e4 LT |
1559 | { |
1560 | unsigned long v; | |
1561 | ||
1562 | v = apic_read(APIC_LVT0); | |
11a8e778 | 1563 | apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED); |
1da177e4 LT |
1564 | } |
1565 | ||
c88ac1df | 1566 | static void mask_lapic_irq(unsigned int irq) |
1da177e4 LT |
1567 | { |
1568 | unsigned long v; | |
1569 | ||
1570 | v = apic_read(APIC_LVT0); | |
11a8e778 | 1571 | apic_write(APIC_LVT0, v | APIC_LVT_MASKED); |
1da177e4 LT |
1572 | } |
1573 | ||
1574 | static void ack_lapic_irq (unsigned int irq) | |
1575 | { | |
1576 | ack_APIC_irq(); | |
1577 | } | |
1578 | ||
c88ac1df MR |
1579 | static struct irq_chip lapic_chip __read_mostly = { |
1580 | .name = "local-APIC", | |
1581 | .mask = mask_lapic_irq, | |
1582 | .unmask = unmask_lapic_irq, | |
1583 | .ack = ack_lapic_irq, | |
1da177e4 LT |
1584 | }; |
1585 | ||
c88ac1df MR |
1586 | static void lapic_register_intr(int irq) |
1587 | { | |
1588 | irq_desc[irq].status &= ~IRQ_LEVEL; | |
1589 | set_irq_chip_and_handler_name(irq, &lapic_chip, handle_edge_irq, | |
1590 | "edge"); | |
1591 | } | |
1592 | ||
e9427101 | 1593 | static void __init setup_nmi(void) |
1da177e4 LT |
1594 | { |
1595 | /* | |
1596 | * Dirty trick to enable the NMI watchdog ... | |
1597 | * We put the 8259A master into AEOI mode and | |
1598 | * unmask on all local APICs LVT0 as NMI. | |
1599 | * | |
1600 | * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire') | |
1601 | * is from Maciej W. Rozycki - so we do not have to EOI from | |
1602 | * the NMI handler or the timer interrupt. | |
1603 | */ | |
1604 | printk(KERN_INFO "activating NMI Watchdog ..."); | |
1605 | ||
e9427101 | 1606 | enable_NMI_through_LVT0(); |
1da177e4 LT |
1607 | |
1608 | printk(" done.\n"); | |
1609 | } | |
1610 | ||
1611 | /* | |
1612 | * This looks a bit hackish but it's about the only one way of sending | |
1613 | * a few INTA cycles to 8259As and any associated glue logic. ICR does | |
1614 | * not support the ExtINT mode, unfortunately. We need to send these | |
1615 | * cycles as some i82489DX-based boards have glue logic that keeps the | |
1616 | * 8259A interrupt line asserted until INTA. --macro | |
1617 | */ | |
5afca33a | 1618 | static inline void __init unlock_ExtINT_logic(void) |
1da177e4 | 1619 | { |
1008fddc | 1620 | int apic, pin, i; |
1da177e4 LT |
1621 | struct IO_APIC_route_entry entry0, entry1; |
1622 | unsigned char save_control, save_freq_select; | |
1da177e4 | 1623 | |
1008fddc EB |
1624 | pin = find_isa_irq_pin(8, mp_INT); |
1625 | apic = find_isa_irq_apic(8, mp_INT); | |
1da177e4 LT |
1626 | if (pin == -1) |
1627 | return; | |
1628 | ||
a2249cba AM |
1629 | entry0 = ioapic_read_entry(apic, pin); |
1630 | ||
1008fddc | 1631 | clear_IO_APIC_pin(apic, pin); |
1da177e4 LT |
1632 | |
1633 | memset(&entry1, 0, sizeof(entry1)); | |
1634 | ||
1635 | entry1.dest_mode = 0; /* physical delivery */ | |
1636 | entry1.mask = 0; /* unmask IRQ now */ | |
ee4eff6f | 1637 | entry1.dest = hard_smp_processor_id(); |
1da177e4 LT |
1638 | entry1.delivery_mode = dest_ExtINT; |
1639 | entry1.polarity = entry0.polarity; | |
1640 | entry1.trigger = 0; | |
1641 | entry1.vector = 0; | |
1642 | ||
a2249cba | 1643 | ioapic_write_entry(apic, pin, entry1); |
1da177e4 LT |
1644 | |
1645 | save_control = CMOS_READ(RTC_CONTROL); | |
1646 | save_freq_select = CMOS_READ(RTC_FREQ_SELECT); | |
1647 | CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6, | |
1648 | RTC_FREQ_SELECT); | |
1649 | CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL); | |
1650 | ||
1651 | i = 100; | |
1652 | while (i-- > 0) { | |
1653 | mdelay(10); | |
1654 | if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF) | |
1655 | i -= 10; | |
1656 | } | |
1657 | ||
1658 | CMOS_WRITE(save_control, RTC_CONTROL); | |
1659 | CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT); | |
1008fddc | 1660 | clear_IO_APIC_pin(apic, pin); |
1da177e4 | 1661 | |
a2249cba | 1662 | ioapic_write_entry(apic, pin, entry0); |
1da177e4 LT |
1663 | } |
1664 | ||
1665 | /* | |
1666 | * This code may look a bit paranoid, but it's supposed to cooperate with | |
1667 | * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ | |
1668 | * is so screwy. Thanks to Brian Perkins for testing/hacking this beast | |
1669 | * fanatically on his truly buggy board. | |
fea5f1e1 LT |
1670 | * |
1671 | * FIXME: really need to revamp this for modern platforms only. | |
1da177e4 | 1672 | */ |
e9427101 | 1673 | static inline void __init check_timer(void) |
1da177e4 | 1674 | { |
dfbffdd8 | 1675 | struct irq_cfg *cfg = irq_cfg + 0; |
1008fddc | 1676 | int apic1, pin1, apic2, pin2; |
4aae0702 | 1677 | unsigned long flags; |
691874fa | 1678 | int no_pin1 = 0; |
4aae0702 IM |
1679 | |
1680 | local_irq_save(flags); | |
1da177e4 LT |
1681 | |
1682 | /* | |
1683 | * get/set the timer IRQ vector: | |
1684 | */ | |
1685 | disable_8259A_irq(0); | |
dfbffdd8 | 1686 | assign_irq_vector(0, TARGET_CPUS); |
1da177e4 LT |
1687 | |
1688 | /* | |
d11d5794 MR |
1689 | * As IRQ0 is to be enabled in the 8259A, the virtual |
1690 | * wire has to be disabled in the local APIC. | |
1da177e4 | 1691 | */ |
11a8e778 | 1692 | apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT); |
1da177e4 | 1693 | init_8259A(1); |
1da177e4 | 1694 | |
1008fddc EB |
1695 | pin1 = find_isa_irq_pin(0, mp_INT); |
1696 | apic1 = find_isa_irq_apic(0, mp_INT); | |
1697 | pin2 = ioapic_i8259.pin; | |
1698 | apic2 = ioapic_i8259.apic; | |
1da177e4 | 1699 | |
49a66a0b MR |
1700 | apic_printk(APIC_QUIET, KERN_INFO "..TIMER: vector=0x%02X " |
1701 | "apic1=%d pin1=%d apic2=%d pin2=%d\n", | |
1702 | cfg->vector, apic1, pin1, apic2, pin2); | |
b0268726 | 1703 | |
691874fa MR |
1704 | /* |
1705 | * Some BIOS writers are clueless and report the ExtINTA | |
1706 | * I/O APIC input from the cascaded 8259A as the timer | |
1707 | * interrupt input. So just in case, if only one pin | |
1708 | * was found above, try it both directly and through the | |
1709 | * 8259A. | |
1710 | */ | |
1711 | if (pin1 == -1) { | |
1712 | pin1 = pin2; | |
1713 | apic1 = apic2; | |
1714 | no_pin1 = 1; | |
1715 | } else if (pin2 == -1) { | |
1716 | pin2 = pin1; | |
1717 | apic2 = apic1; | |
1718 | } | |
1719 | ||
fea5f1e1 LT |
1720 | if (pin1 != -1) { |
1721 | /* | |
1722 | * Ok, does IRQ0 through the IOAPIC work? | |
1723 | */ | |
691874fa MR |
1724 | if (no_pin1) { |
1725 | add_pin_to_irq(0, apic1, pin1); | |
b1b57ee1 | 1726 | setup_timer_IRQ0_pin(apic1, pin1, cfg->vector); |
691874fa | 1727 | } |
fea5f1e1 LT |
1728 | unmask_IO_APIC_irq(0); |
1729 | if (!no_timer_check && timer_irq_works()) { | |
fea5f1e1 | 1730 | if (nmi_watchdog == NMI_IO_APIC) { |
fea5f1e1 LT |
1731 | setup_nmi(); |
1732 | enable_8259A_irq(0); | |
1733 | } | |
1734 | if (disable_timer_pin_1 > 0) | |
1735 | clear_IO_APIC_pin(0, pin1); | |
4aae0702 | 1736 | goto out; |
fea5f1e1 LT |
1737 | } |
1738 | clear_IO_APIC_pin(apic1, pin1); | |
691874fa | 1739 | if (!no_pin1) |
49a66a0b | 1740 | apic_printk(APIC_QUIET, KERN_ERR "..MP-BIOS bug: " |
691874fa | 1741 | "8254 timer not connected to IO-APIC\n"); |
1da177e4 | 1742 | |
49a66a0b MR |
1743 | apic_printk(APIC_QUIET, KERN_INFO "...trying to set up timer " |
1744 | "(IRQ0) through the 8259A ...\n"); | |
1745 | apic_printk(APIC_QUIET, KERN_INFO | |
1746 | "..... (found apic %d pin %d) ...\n", apic2, pin2); | |
fea5f1e1 LT |
1747 | /* |
1748 | * legacy devices should be connected to IO APIC #0 | |
1749 | */ | |
0b9f4f49 | 1750 | replace_pin_at_irq(0, apic1, pin1, apic2, pin2); |
f7633ce5 | 1751 | setup_timer_IRQ0_pin(apic2, pin2, cfg->vector); |
24742ece | 1752 | unmask_IO_APIC_irq(0); |
ecd29476 | 1753 | enable_8259A_irq(0); |
fea5f1e1 | 1754 | if (timer_irq_works()) { |
49a66a0b | 1755 | apic_printk(APIC_QUIET, KERN_INFO "....... works.\n"); |
35542c5e | 1756 | timer_through_8259 = 1; |
fea5f1e1 | 1757 | if (nmi_watchdog == NMI_IO_APIC) { |
60134ebe | 1758 | disable_8259A_irq(0); |
fea5f1e1 | 1759 | setup_nmi(); |
60134ebe | 1760 | enable_8259A_irq(0); |
fea5f1e1 | 1761 | } |
4aae0702 | 1762 | goto out; |
fea5f1e1 LT |
1763 | } |
1764 | /* | |
1765 | * Cleanup, just in case ... | |
1766 | */ | |
ecd29476 | 1767 | disable_8259A_irq(0); |
fea5f1e1 | 1768 | clear_IO_APIC_pin(apic2, pin2); |
49a66a0b | 1769 | apic_printk(APIC_QUIET, KERN_INFO "....... failed.\n"); |
1da177e4 | 1770 | } |
1da177e4 | 1771 | |
1f992153 | 1772 | if (nmi_watchdog == NMI_IO_APIC) { |
49a66a0b MR |
1773 | apic_printk(APIC_QUIET, KERN_WARNING "timer doesn't work " |
1774 | "through the IO-APIC - disabling NMI Watchdog!\n"); | |
067fa0ff | 1775 | nmi_watchdog = NMI_NONE; |
1da177e4 LT |
1776 | } |
1777 | ||
49a66a0b MR |
1778 | apic_printk(APIC_QUIET, KERN_INFO |
1779 | "...trying to set up timer as Virtual Wire IRQ...\n"); | |
1da177e4 | 1780 | |
c88ac1df | 1781 | lapic_register_intr(0); |
dfbffdd8 | 1782 | apic_write(APIC_LVT0, APIC_DM_FIXED | cfg->vector); /* Fixed mode */ |
1da177e4 LT |
1783 | enable_8259A_irq(0); |
1784 | ||
1785 | if (timer_irq_works()) { | |
49a66a0b | 1786 | apic_printk(APIC_QUIET, KERN_INFO "..... works.\n"); |
4aae0702 | 1787 | goto out; |
1da177e4 | 1788 | } |
e67465f1 | 1789 | disable_8259A_irq(0); |
dfbffdd8 | 1790 | apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | cfg->vector); |
49a66a0b | 1791 | apic_printk(APIC_QUIET, KERN_INFO "..... failed.\n"); |
1da177e4 | 1792 | |
49a66a0b MR |
1793 | apic_printk(APIC_QUIET, KERN_INFO |
1794 | "...trying to set up timer as ExtINT IRQ...\n"); | |
1da177e4 LT |
1795 | |
1796 | init_8259A(0); | |
1797 | make_8259A_irq(0); | |
11a8e778 | 1798 | apic_write(APIC_LVT0, APIC_DM_EXTINT); |
1da177e4 LT |
1799 | |
1800 | unlock_ExtINT_logic(); | |
1801 | ||
1802 | if (timer_irq_works()) { | |
49a66a0b | 1803 | apic_printk(APIC_QUIET, KERN_INFO "..... works.\n"); |
4aae0702 | 1804 | goto out; |
1da177e4 | 1805 | } |
49a66a0b MR |
1806 | apic_printk(APIC_QUIET, KERN_INFO "..... failed :(.\n"); |
1807 | panic("IO-APIC + timer doesn't work! Boot with apic=debug and send a " | |
1808 | "report. Then try booting with the 'noapic' option.\n"); | |
4aae0702 IM |
1809 | out: |
1810 | local_irq_restore(flags); | |
1da177e4 LT |
1811 | } |
1812 | ||
14d98cad AK |
1813 | static int __init notimercheck(char *s) |
1814 | { | |
1815 | no_timer_check = 1; | |
1816 | return 1; | |
1817 | } | |
1818 | __setup("no_timer_check", notimercheck); | |
1819 | ||
1da177e4 | 1820 | /* |
af174783 MR |
1821 | * Traditionally ISA IRQ2 is the cascade IRQ, and is not available |
1822 | * to devices. However there may be an I/O APIC pin available for | |
1823 | * this interrupt regardless. The pin may be left unconnected, but | |
1824 | * typically it will be reused as an ExtINT cascade interrupt for | |
1825 | * the master 8259A. In the MPS case such a pin will normally be | |
1826 | * reported as an ExtINT interrupt in the MP table. With ACPI | |
1827 | * there is no provision for ExtINT interrupts, and in the absence | |
1828 | * of an override it would be treated as an ordinary ISA I/O APIC | |
1829 | * interrupt, that is edge-triggered and unmasked by default. We | |
1830 | * used to do this, but it caused problems on some systems because | |
1831 | * of the NMI watchdog and sometimes IRQ0 of the 8254 timer using | |
1832 | * the same ExtINT cascade interrupt to drive the local APIC of the | |
1833 | * bootstrap processor. Therefore we refrain from routing IRQ2 to | |
1834 | * the I/O APIC in all cases now. No actual device should request | |
1835 | * it anyway. --macro | |
1da177e4 LT |
1836 | */ |
1837 | #define PIC_IRQS (1<<2) | |
1838 | ||
1839 | void __init setup_IO_APIC(void) | |
1840 | { | |
1c69524c YL |
1841 | |
1842 | /* | |
1843 | * calling enable_IO_APIC() is moved to setup_local_APIC for BP | |
1844 | */ | |
1da177e4 | 1845 | |
af174783 | 1846 | io_apic_irqs = ~PIC_IRQS; |
1da177e4 LT |
1847 | |
1848 | apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n"); | |
1849 | ||
1da177e4 LT |
1850 | sync_Arb_IDs(); |
1851 | setup_IO_APIC_irqs(); | |
1852 | init_IO_APIC_traps(); | |
1853 | check_timer(); | |
1854 | if (!acpi_ioapic) | |
1855 | print_IO_APIC(); | |
1856 | } | |
1857 | ||
1858 | struct sysfs_ioapic_data { | |
1859 | struct sys_device dev; | |
1860 | struct IO_APIC_route_entry entry[0]; | |
1861 | }; | |
1862 | static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS]; | |
1863 | ||
0b9c33a7 | 1864 | static int ioapic_suspend(struct sys_device *dev, pm_message_t state) |
1da177e4 LT |
1865 | { |
1866 | struct IO_APIC_route_entry *entry; | |
1867 | struct sysfs_ioapic_data *data; | |
1da177e4 LT |
1868 | int i; |
1869 | ||
1870 | data = container_of(dev, struct sysfs_ioapic_data, dev); | |
1871 | entry = data->entry; | |
eea0e11c AK |
1872 | for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ ) |
1873 | *entry = ioapic_read_entry(dev->id, i); | |
1da177e4 LT |
1874 | |
1875 | return 0; | |
1876 | } | |
1877 | ||
1878 | static int ioapic_resume(struct sys_device *dev) | |
1879 | { | |
1880 | struct IO_APIC_route_entry *entry; | |
1881 | struct sysfs_ioapic_data *data; | |
1882 | unsigned long flags; | |
1883 | union IO_APIC_reg_00 reg_00; | |
1884 | int i; | |
1885 | ||
1886 | data = container_of(dev, struct sysfs_ioapic_data, dev); | |
1887 | entry = data->entry; | |
1888 | ||
1889 | spin_lock_irqsave(&ioapic_lock, flags); | |
1890 | reg_00.raw = io_apic_read(dev->id, 0); | |
ec2cd0a2 AS |
1891 | if (reg_00.bits.ID != mp_ioapics[dev->id].mp_apicid) { |
1892 | reg_00.bits.ID = mp_ioapics[dev->id].mp_apicid; | |
1da177e4 LT |
1893 | io_apic_write(dev->id, 0, reg_00.raw); |
1894 | } | |
1da177e4 | 1895 | spin_unlock_irqrestore(&ioapic_lock, flags); |
eea0e11c AK |
1896 | for (i = 0; i < nr_ioapic_registers[dev->id]; i++) |
1897 | ioapic_write_entry(dev->id, i, entry[i]); | |
1da177e4 LT |
1898 | |
1899 | return 0; | |
1900 | } | |
1901 | ||
1902 | static struct sysdev_class ioapic_sysdev_class = { | |
af5ca3f4 | 1903 | .name = "ioapic", |
1da177e4 LT |
1904 | .suspend = ioapic_suspend, |
1905 | .resume = ioapic_resume, | |
1906 | }; | |
1907 | ||
1908 | static int __init ioapic_init_sysfs(void) | |
1909 | { | |
1910 | struct sys_device * dev; | |
cddf7ff7 | 1911 | int i, size, error; |
1da177e4 LT |
1912 | |
1913 | error = sysdev_class_register(&ioapic_sysdev_class); | |
1914 | if (error) | |
1915 | return error; | |
1916 | ||
1917 | for (i = 0; i < nr_ioapics; i++ ) { | |
1918 | size = sizeof(struct sys_device) + nr_ioapic_registers[i] | |
1919 | * sizeof(struct IO_APIC_route_entry); | |
cddf7ff7 | 1920 | mp_ioapic_data[i] = kzalloc(size, GFP_KERNEL); |
1da177e4 LT |
1921 | if (!mp_ioapic_data[i]) { |
1922 | printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i); | |
1923 | continue; | |
1924 | } | |
1da177e4 LT |
1925 | dev = &mp_ioapic_data[i]->dev; |
1926 | dev->id = i; | |
1927 | dev->cls = &ioapic_sysdev_class; | |
1928 | error = sysdev_register(dev); | |
1929 | if (error) { | |
1930 | kfree(mp_ioapic_data[i]); | |
1931 | mp_ioapic_data[i] = NULL; | |
1932 | printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i); | |
1933 | continue; | |
1934 | } | |
1935 | } | |
1936 | ||
1937 | return 0; | |
1938 | } | |
1939 | ||
1940 | device_initcall(ioapic_init_sysfs); | |
1941 | ||
c4fa0bbf | 1942 | /* |
04b9267b | 1943 | * Dynamic irq allocate and deallocation |
c4fa0bbf EB |
1944 | */ |
1945 | int create_irq(void) | |
1946 | { | |
04b9267b EB |
1947 | /* Allocate an unused irq */ |
1948 | int irq; | |
1949 | int new; | |
c4fa0bbf | 1950 | unsigned long flags; |
c4fa0bbf | 1951 | |
04b9267b EB |
1952 | irq = -ENOSPC; |
1953 | spin_lock_irqsave(&vector_lock, flags); | |
1954 | for (new = (NR_IRQS - 1); new >= 0; new--) { | |
1955 | if (platform_legacy_irq(new)) | |
1956 | continue; | |
13a79503 | 1957 | if (irq_cfg[new].vector != 0) |
04b9267b | 1958 | continue; |
dfbffdd8 | 1959 | if (__assign_irq_vector(new, TARGET_CPUS) == 0) |
04b9267b EB |
1960 | irq = new; |
1961 | break; | |
1962 | } | |
1963 | spin_unlock_irqrestore(&vector_lock, flags); | |
c4fa0bbf | 1964 | |
04b9267b | 1965 | if (irq >= 0) { |
c4fa0bbf EB |
1966 | dynamic_irq_init(irq); |
1967 | } | |
1968 | return irq; | |
1969 | } | |
1970 | ||
1971 | void destroy_irq(unsigned int irq) | |
1972 | { | |
1973 | unsigned long flags; | |
c4fa0bbf EB |
1974 | |
1975 | dynamic_irq_cleanup(irq); | |
1976 | ||
1977 | spin_lock_irqsave(&vector_lock, flags); | |
5df0287e | 1978 | __clear_irq_vector(irq); |
c4fa0bbf EB |
1979 | spin_unlock_irqrestore(&vector_lock, flags); |
1980 | } | |
c4fa0bbf | 1981 | |
589e367f | 1982 | /* |
676b1855 | 1983 | * MSI message composition |
589e367f EB |
1984 | */ |
1985 | #ifdef CONFIG_PCI_MSI | |
3b7d1921 | 1986 | static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg) |
589e367f | 1987 | { |
dfbffdd8 EB |
1988 | struct irq_cfg *cfg = irq_cfg + irq; |
1989 | int err; | |
589e367f | 1990 | unsigned dest; |
c7111c13 | 1991 | cpumask_t tmp; |
589e367f | 1992 | |
dfbffdd8 EB |
1993 | tmp = TARGET_CPUS; |
1994 | err = assign_irq_vector(irq, tmp); | |
1995 | if (!err) { | |
1996 | cpus_and(tmp, cfg->domain, tmp); | |
589e367f EB |
1997 | dest = cpu_mask_to_apicid(tmp); |
1998 | ||
1999 | msg->address_hi = MSI_ADDR_BASE_HI; | |
2000 | msg->address_lo = | |
2001 | MSI_ADDR_BASE_LO | | |
2002 | ((INT_DEST_MODE == 0) ? | |
2003 | MSI_ADDR_DEST_MODE_PHYSICAL: | |
2004 | MSI_ADDR_DEST_MODE_LOGICAL) | | |
2005 | ((INT_DELIVERY_MODE != dest_LowestPrio) ? | |
2006 | MSI_ADDR_REDIRECTION_CPU: | |
2007 | MSI_ADDR_REDIRECTION_LOWPRI) | | |
2008 | MSI_ADDR_DEST_ID(dest); | |
2009 | ||
2010 | msg->data = | |
2011 | MSI_DATA_TRIGGER_EDGE | | |
2012 | MSI_DATA_LEVEL_ASSERT | | |
2013 | ((INT_DELIVERY_MODE != dest_LowestPrio) ? | |
2014 | MSI_DATA_DELIVERY_FIXED: | |
2015 | MSI_DATA_DELIVERY_LOWPRI) | | |
dfbffdd8 | 2016 | MSI_DATA_VECTOR(cfg->vector); |
589e367f | 2017 | } |
dfbffdd8 | 2018 | return err; |
589e367f EB |
2019 | } |
2020 | ||
3b7d1921 EB |
2021 | #ifdef CONFIG_SMP |
2022 | static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask) | |
589e367f | 2023 | { |
dfbffdd8 | 2024 | struct irq_cfg *cfg = irq_cfg + irq; |
3b7d1921 EB |
2025 | struct msi_msg msg; |
2026 | unsigned int dest; | |
2027 | cpumask_t tmp; | |
3b7d1921 EB |
2028 | |
2029 | cpus_and(tmp, mask, cpu_online_map); | |
2030 | if (cpus_empty(tmp)) | |
5ff5115e | 2031 | return; |
589e367f | 2032 | |
dfbffdd8 | 2033 | if (assign_irq_vector(irq, mask)) |
3b7d1921 | 2034 | return; |
550f2299 | 2035 | |
dfbffdd8 | 2036 | cpus_and(tmp, cfg->domain, mask); |
3b7d1921 | 2037 | dest = cpu_mask_to_apicid(tmp); |
589e367f | 2038 | |
3b7d1921 EB |
2039 | read_msi_msg(irq, &msg); |
2040 | ||
2041 | msg.data &= ~MSI_DATA_VECTOR_MASK; | |
dfbffdd8 | 2042 | msg.data |= MSI_DATA_VECTOR(cfg->vector); |
3b7d1921 EB |
2043 | msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK; |
2044 | msg.address_lo |= MSI_ADDR_DEST_ID(dest); | |
2045 | ||
2046 | write_msi_msg(irq, &msg); | |
9f0a5ba5 | 2047 | irq_desc[irq].affinity = mask; |
589e367f | 2048 | } |
3b7d1921 | 2049 | #endif /* CONFIG_SMP */ |
589e367f | 2050 | |
3b7d1921 EB |
2051 | /* |
2052 | * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices, | |
2053 | * which implement the MSI or MSI-X Capability Structure. | |
2054 | */ | |
2055 | static struct irq_chip msi_chip = { | |
2056 | .name = "PCI-MSI", | |
2057 | .unmask = unmask_msi_irq, | |
2058 | .mask = mask_msi_irq, | |
2059 | .ack = ack_apic_edge, | |
2060 | #ifdef CONFIG_SMP | |
2061 | .set_affinity = set_msi_irq_affinity, | |
2062 | #endif | |
2063 | .retrigger = ioapic_retrigger_irq, | |
589e367f EB |
2064 | }; |
2065 | ||
f7feaca7 | 2066 | int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc) |
3b7d1921 EB |
2067 | { |
2068 | struct msi_msg msg; | |
f7feaca7 EB |
2069 | int irq, ret; |
2070 | irq = create_irq(); | |
2071 | if (irq < 0) | |
2072 | return irq; | |
2073 | ||
3b7d1921 | 2074 | ret = msi_compose_msg(dev, irq, &msg); |
f7feaca7 EB |
2075 | if (ret < 0) { |
2076 | destroy_irq(irq); | |
3b7d1921 | 2077 | return ret; |
f7feaca7 | 2078 | } |
3b7d1921 | 2079 | |
7fe3730d | 2080 | set_irq_msi(irq, desc); |
3b7d1921 EB |
2081 | write_msi_msg(irq, &msg); |
2082 | ||
a460e745 | 2083 | set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq, "edge"); |
3b7d1921 | 2084 | |
7fe3730d | 2085 | return 0; |
3b7d1921 EB |
2086 | } |
2087 | ||
2088 | void arch_teardown_msi_irq(unsigned int irq) | |
2089 | { | |
f7feaca7 | 2090 | destroy_irq(irq); |
3b7d1921 EB |
2091 | } |
2092 | ||
3460a6d9 KA |
2093 | #ifdef CONFIG_DMAR |
2094 | #ifdef CONFIG_SMP | |
2095 | static void dmar_msi_set_affinity(unsigned int irq, cpumask_t mask) | |
2096 | { | |
2097 | struct irq_cfg *cfg = irq_cfg + irq; | |
2098 | struct msi_msg msg; | |
2099 | unsigned int dest; | |
2100 | cpumask_t tmp; | |
2101 | ||
2102 | cpus_and(tmp, mask, cpu_online_map); | |
2103 | if (cpus_empty(tmp)) | |
2104 | return; | |
2105 | ||
2106 | if (assign_irq_vector(irq, mask)) | |
2107 | return; | |
2108 | ||
2109 | cpus_and(tmp, cfg->domain, mask); | |
2110 | dest = cpu_mask_to_apicid(tmp); | |
2111 | ||
2112 | dmar_msi_read(irq, &msg); | |
2113 | ||
2114 | msg.data &= ~MSI_DATA_VECTOR_MASK; | |
2115 | msg.data |= MSI_DATA_VECTOR(cfg->vector); | |
2116 | msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK; | |
2117 | msg.address_lo |= MSI_ADDR_DEST_ID(dest); | |
2118 | ||
2119 | dmar_msi_write(irq, &msg); | |
2120 | irq_desc[irq].affinity = mask; | |
2121 | } | |
2122 | #endif /* CONFIG_SMP */ | |
2123 | ||
2124 | struct irq_chip dmar_msi_type = { | |
2125 | .name = "DMAR_MSI", | |
2126 | .unmask = dmar_msi_unmask, | |
2127 | .mask = dmar_msi_mask, | |
2128 | .ack = ack_apic_edge, | |
2129 | #ifdef CONFIG_SMP | |
2130 | .set_affinity = dmar_msi_set_affinity, | |
2131 | #endif | |
2132 | .retrigger = ioapic_retrigger_irq, | |
2133 | }; | |
2134 | ||
2135 | int arch_setup_dmar_msi(unsigned int irq) | |
2136 | { | |
2137 | int ret; | |
2138 | struct msi_msg msg; | |
2139 | ||
2140 | ret = msi_compose_msg(NULL, irq, &msg); | |
2141 | if (ret < 0) | |
2142 | return ret; | |
2143 | dmar_msi_write(irq, &msg); | |
2144 | set_irq_chip_and_handler_name(irq, &dmar_msi_type, handle_edge_irq, | |
2145 | "edge"); | |
2146 | return 0; | |
2147 | } | |
2148 | #endif | |
589e367f | 2149 | |
3460a6d9 | 2150 | #endif /* CONFIG_PCI_MSI */ |
8b955b0d EB |
2151 | /* |
2152 | * Hypertransport interrupt support | |
2153 | */ | |
2154 | #ifdef CONFIG_HT_IRQ | |
2155 | ||
2156 | #ifdef CONFIG_SMP | |
2157 | ||
2158 | static void target_ht_irq(unsigned int irq, unsigned int dest, u8 vector) | |
2159 | { | |
ec68307c EB |
2160 | struct ht_irq_msg msg; |
2161 | fetch_ht_irq_msg(irq, &msg); | |
8b955b0d | 2162 | |
ec68307c EB |
2163 | msg.address_lo &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK); |
2164 | msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK); | |
8b955b0d | 2165 | |
ec68307c EB |
2166 | msg.address_lo |= HT_IRQ_LOW_VECTOR(vector) | HT_IRQ_LOW_DEST_ID(dest); |
2167 | msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest); | |
8b955b0d | 2168 | |
ec68307c | 2169 | write_ht_irq_msg(irq, &msg); |
8b955b0d EB |
2170 | } |
2171 | ||
2172 | static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask) | |
2173 | { | |
dfbffdd8 | 2174 | struct irq_cfg *cfg = irq_cfg + irq; |
8b955b0d EB |
2175 | unsigned int dest; |
2176 | cpumask_t tmp; | |
8b955b0d EB |
2177 | |
2178 | cpus_and(tmp, mask, cpu_online_map); | |
2179 | if (cpus_empty(tmp)) | |
5ff5115e | 2180 | return; |
8b955b0d | 2181 | |
dfbffdd8 | 2182 | if (assign_irq_vector(irq, mask)) |
8b955b0d EB |
2183 | return; |
2184 | ||
dfbffdd8 | 2185 | cpus_and(tmp, cfg->domain, mask); |
8b955b0d EB |
2186 | dest = cpu_mask_to_apicid(tmp); |
2187 | ||
dfbffdd8 | 2188 | target_ht_irq(irq, dest, cfg->vector); |
9f0a5ba5 | 2189 | irq_desc[irq].affinity = mask; |
8b955b0d EB |
2190 | } |
2191 | #endif | |
2192 | ||
c37e108d | 2193 | static struct irq_chip ht_irq_chip = { |
8b955b0d EB |
2194 | .name = "PCI-HT", |
2195 | .mask = mask_ht_irq, | |
2196 | .unmask = unmask_ht_irq, | |
2197 | .ack = ack_apic_edge, | |
2198 | #ifdef CONFIG_SMP | |
2199 | .set_affinity = set_ht_irq_affinity, | |
2200 | #endif | |
2201 | .retrigger = ioapic_retrigger_irq, | |
2202 | }; | |
2203 | ||
2204 | int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev) | |
2205 | { | |
dfbffdd8 EB |
2206 | struct irq_cfg *cfg = irq_cfg + irq; |
2207 | int err; | |
c7111c13 | 2208 | cpumask_t tmp; |
8b955b0d | 2209 | |
dfbffdd8 EB |
2210 | tmp = TARGET_CPUS; |
2211 | err = assign_irq_vector(irq, tmp); | |
2212 | if (!err) { | |
ec68307c | 2213 | struct ht_irq_msg msg; |
8b955b0d | 2214 | unsigned dest; |
8b955b0d | 2215 | |
dfbffdd8 | 2216 | cpus_and(tmp, cfg->domain, tmp); |
8b955b0d EB |
2217 | dest = cpu_mask_to_apicid(tmp); |
2218 | ||
ec68307c | 2219 | msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest); |
8b955b0d | 2220 | |
ec68307c EB |
2221 | msg.address_lo = |
2222 | HT_IRQ_LOW_BASE | | |
8b955b0d | 2223 | HT_IRQ_LOW_DEST_ID(dest) | |
dfbffdd8 | 2224 | HT_IRQ_LOW_VECTOR(cfg->vector) | |
8b955b0d EB |
2225 | ((INT_DEST_MODE == 0) ? |
2226 | HT_IRQ_LOW_DM_PHYSICAL : | |
2227 | HT_IRQ_LOW_DM_LOGICAL) | | |
2228 | HT_IRQ_LOW_RQEOI_EDGE | | |
2229 | ((INT_DELIVERY_MODE != dest_LowestPrio) ? | |
2230 | HT_IRQ_LOW_MT_FIXED : | |
ec68307c EB |
2231 | HT_IRQ_LOW_MT_ARBITRATED) | |
2232 | HT_IRQ_LOW_IRQ_MASKED; | |
8b955b0d | 2233 | |
ec68307c | 2234 | write_ht_irq_msg(irq, &msg); |
8b955b0d | 2235 | |
a460e745 IM |
2236 | set_irq_chip_and_handler_name(irq, &ht_irq_chip, |
2237 | handle_edge_irq, "edge"); | |
8b955b0d | 2238 | } |
dfbffdd8 | 2239 | return err; |
8b955b0d EB |
2240 | } |
2241 | #endif /* CONFIG_HT_IRQ */ | |
2242 | ||
1da177e4 LT |
2243 | /* -------------------------------------------------------------------------- |
2244 | ACPI-based IOAPIC Configuration | |
2245 | -------------------------------------------------------------------------- */ | |
2246 | ||
888ba6c6 | 2247 | #ifdef CONFIG_ACPI |
1da177e4 LT |
2248 | |
2249 | #define IO_APIC_MAX_ID 0xFE | |
2250 | ||
1da177e4 LT |
2251 | int __init io_apic_get_redir_entries (int ioapic) |
2252 | { | |
2253 | union IO_APIC_reg_01 reg_01; | |
2254 | unsigned long flags; | |
2255 | ||
2256 | spin_lock_irqsave(&ioapic_lock, flags); | |
2257 | reg_01.raw = io_apic_read(ioapic, 1); | |
2258 | spin_unlock_irqrestore(&ioapic_lock, flags); | |
2259 | ||
2260 | return reg_01.bits.entries; | |
2261 | } | |
2262 | ||
2263 | ||
50eca3eb | 2264 | int io_apic_set_pci_routing (int ioapic, int pin, int irq, int triggering, int polarity) |
1da177e4 | 2265 | { |
1da177e4 LT |
2266 | if (!IO_APIC_IRQ(irq)) { |
2267 | apic_printk(APIC_QUIET,KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n", | |
2268 | ioapic); | |
2269 | return -EINVAL; | |
2270 | } | |
2271 | ||
550f2299 EB |
2272 | /* |
2273 | * IRQs < 16 are already in the irq_2_pin[] map | |
2274 | */ | |
2275 | if (irq >= 16) | |
2276 | add_pin_to_irq(irq, ioapic, pin); | |
2277 | ||
a8c8a367 | 2278 | setup_IO_APIC_irq(ioapic, pin, irq, triggering, polarity); |
1da177e4 LT |
2279 | |
2280 | return 0; | |
2281 | } | |
2282 | ||
1da177e4 | 2283 | |
61fd47e0 SL |
2284 | int acpi_get_override_irq(int bus_irq, int *trigger, int *polarity) |
2285 | { | |
2286 | int i; | |
2287 | ||
2288 | if (skip_ioapic_setup) | |
2289 | return -1; | |
2290 | ||
2291 | for (i = 0; i < mp_irq_entries; i++) | |
2fddb6e2 AS |
2292 | if (mp_irqs[i].mp_irqtype == mp_INT && |
2293 | mp_irqs[i].mp_srcbusirq == bus_irq) | |
61fd47e0 SL |
2294 | break; |
2295 | if (i >= mp_irq_entries) | |
2296 | return -1; | |
2297 | ||
2298 | *trigger = irq_trigger(i); | |
2299 | *polarity = irq_polarity(i); | |
2300 | return 0; | |
2301 | } | |
2302 | ||
2303 | #endif /* CONFIG_ACPI */ | |
1da177e4 LT |
2304 | |
2305 | /* | |
2306 | * This function currently is only a helper for the i386 smp boot process where | |
2307 | * we need to reprogram the ioredtbls to cater for the cpus which have come online | |
2308 | * so mask in all cases should simply be TARGET_CPUS | |
2309 | */ | |
54d5d424 | 2310 | #ifdef CONFIG_SMP |
1da177e4 LT |
2311 | void __init setup_ioapic_dest(void) |
2312 | { | |
2313 | int pin, ioapic, irq, irq_entry; | |
2314 | ||
2315 | if (skip_ioapic_setup == 1) | |
2316 | return; | |
2317 | ||
2318 | for (ioapic = 0; ioapic < nr_ioapics; ioapic++) { | |
2319 | for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) { | |
2320 | irq_entry = find_irq_entry(ioapic, pin, mp_INT); | |
2321 | if (irq_entry == -1) | |
2322 | continue; | |
2323 | irq = pin_2_irq(irq_entry, ioapic, pin); | |
ad892f5e YL |
2324 | |
2325 | /* setup_IO_APIC_irqs could fail to get vector for some device | |
2326 | * when you have too many devices, because at that time only boot | |
2327 | * cpu is online. | |
2328 | */ | |
13a79503 | 2329 | if (!irq_cfg[irq].vector) |
a8c8a367 EB |
2330 | setup_IO_APIC_irq(ioapic, pin, irq, |
2331 | irq_trigger(irq_entry), | |
2332 | irq_polarity(irq_entry)); | |
ad892f5e YL |
2333 | else |
2334 | set_ioapic_affinity_irq(irq, TARGET_CPUS); | |
1da177e4 LT |
2335 | } |
2336 | ||
2337 | } | |
2338 | } | |
54d5d424 | 2339 | #endif |
61fd47e0 | 2340 | |
3e35a0e5 TG |
2341 | #define IOAPIC_RESOURCE_NAME_SIZE 11 |
2342 | ||
2343 | static struct resource *ioapic_resources; | |
2344 | ||
2345 | static struct resource * __init ioapic_setup_resources(void) | |
2346 | { | |
2347 | unsigned long n; | |
2348 | struct resource *res; | |
2349 | char *mem; | |
2350 | int i; | |
2351 | ||
2352 | if (nr_ioapics <= 0) | |
2353 | return NULL; | |
2354 | ||
2355 | n = IOAPIC_RESOURCE_NAME_SIZE + sizeof(struct resource); | |
2356 | n *= nr_ioapics; | |
2357 | ||
2358 | mem = alloc_bootmem(n); | |
2359 | res = (void *)mem; | |
2360 | ||
2361 | if (mem != NULL) { | |
3e35a0e5 TG |
2362 | mem += sizeof(struct resource) * nr_ioapics; |
2363 | ||
2364 | for (i = 0; i < nr_ioapics; i++) { | |
2365 | res[i].name = mem; | |
2366 | res[i].flags = IORESOURCE_MEM | IORESOURCE_BUSY; | |
2367 | sprintf(mem, "IOAPIC %u", i); | |
2368 | mem += IOAPIC_RESOURCE_NAME_SIZE; | |
2369 | } | |
2370 | } | |
2371 | ||
2372 | ioapic_resources = res; | |
2373 | ||
2374 | return res; | |
2375 | } | |
2376 | ||
2377 | void __init ioapic_init_mappings(void) | |
2378 | { | |
2379 | unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0; | |
2380 | struct resource *ioapic_res; | |
2381 | int i; | |
2382 | ||
2383 | ioapic_res = ioapic_setup_resources(); | |
2384 | for (i = 0; i < nr_ioapics; i++) { | |
2385 | if (smp_found_config) { | |
ec2cd0a2 | 2386 | ioapic_phys = mp_ioapics[i].mp_apicaddr; |
3e35a0e5 TG |
2387 | } else { |
2388 | ioapic_phys = (unsigned long) | |
2389 | alloc_bootmem_pages(PAGE_SIZE); | |
2390 | ioapic_phys = __pa(ioapic_phys); | |
2391 | } | |
2392 | set_fixmap_nocache(idx, ioapic_phys); | |
2393 | apic_printk(APIC_VERBOSE, | |
2394 | "mapped IOAPIC to %016lx (%016lx)\n", | |
2395 | __fix_to_virt(idx), ioapic_phys); | |
2396 | idx++; | |
2397 | ||
2398 | if (ioapic_res != NULL) { | |
2399 | ioapic_res->start = ioapic_phys; | |
2400 | ioapic_res->end = ioapic_phys + (4 * 1024) - 1; | |
2401 | ioapic_res++; | |
2402 | } | |
2403 | } | |
2404 | } | |
2405 | ||
2406 | static int __init ioapic_insert_resources(void) | |
2407 | { | |
2408 | int i; | |
2409 | struct resource *r = ioapic_resources; | |
2410 | ||
2411 | if (!r) { | |
2412 | printk(KERN_ERR | |
2413 | "IO APIC resources could be not be allocated.\n"); | |
2414 | return -1; | |
2415 | } | |
2416 | ||
2417 | for (i = 0; i < nr_ioapics; i++) { | |
2418 | insert_resource(&iomem_resource, r); | |
2419 | r++; | |
2420 | } | |
2421 | ||
2422 | return 0; | |
2423 | } | |
2424 | ||
2425 | /* Insert the IO APIC resources after PCI initialization has occured to handle | |
2426 | * IO APICS that are mapped in on a BAR in PCI space. */ | |
2427 | late_initcall(ioapic_insert_resources); | |
2428 |