Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Local APIC handling, local APIC timers | |
3 | * | |
4 | * (c) 1999, 2000 Ingo Molnar <mingo@redhat.com> | |
5 | * | |
6 | * Fixes | |
7 | * Maciej W. Rozycki : Bits for genuine 82489DX APICs; | |
8 | * thanks to Eric Gilmore | |
9 | * and Rolf G. Tews | |
10 | * for testing these extensively. | |
11 | * Maciej W. Rozycki : Various updates and fixes. | |
12 | * Mikael Pettersson : Power Management for UP-APIC. | |
13 | * Pavel Machek and | |
14 | * Mikael Pettersson : PM converted to driver model. | |
15 | */ | |
16 | ||
17 | #include <linux/config.h> | |
18 | #include <linux/init.h> | |
19 | ||
20 | #include <linux/mm.h> | |
1da177e4 LT |
21 | #include <linux/delay.h> |
22 | #include <linux/bootmem.h> | |
23 | #include <linux/smp_lock.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/mc146818rtc.h> | |
26 | #include <linux/kernel_stat.h> | |
27 | #include <linux/sysdev.h> | |
f3705136 | 28 | #include <linux/cpu.h> |
6eb0a0fd | 29 | #include <linux/module.h> |
1da177e4 LT |
30 | |
31 | #include <asm/atomic.h> | |
32 | #include <asm/smp.h> | |
33 | #include <asm/mtrr.h> | |
34 | #include <asm/mpspec.h> | |
35 | #include <asm/desc.h> | |
36 | #include <asm/arch_hooks.h> | |
37 | #include <asm/hpet.h> | |
306e440d | 38 | #include <asm/i8253.h> |
1da177e4 LT |
39 | |
40 | #include <mach_apic.h> | |
382dbd07 | 41 | #include <mach_apicdef.h> |
6eb0a0fd | 42 | #include <mach_ipi.h> |
1da177e4 LT |
43 | |
44 | #include "io_ports.h" | |
45 | ||
6eb0a0fd VP |
46 | /* |
47 | * cpu_mask that denotes the CPUs that needs timer interrupt coming in as | |
48 | * IPIs in place of local APIC timers | |
49 | */ | |
50 | static cpumask_t timer_bcast_ipi; | |
51 | ||
9635b47d EB |
52 | /* |
53 | * Knob to control our willingness to enable the local APIC. | |
54 | */ | |
55 | int enable_local_apic __initdata = 0; /* -1=force-disable, +1=force-enable */ | |
56 | ||
1da177e4 LT |
57 | /* |
58 | * Debug level | |
59 | */ | |
60 | int apic_verbosity; | |
61 | ||
62 | ||
63 | static void apic_pm_activate(void); | |
64 | ||
95d769aa AK |
65 | int modern_apic(void) |
66 | { | |
67 | unsigned int lvr, version; | |
68 | /* AMD systems use old APIC versions, so check the CPU */ | |
69 | if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD && | |
70 | boot_cpu_data.x86 >= 0xf) | |
71 | return 1; | |
72 | lvr = apic_read(APIC_LVR); | |
73 | version = GET_APIC_VERSION(lvr); | |
74 | return version >= 0x14; | |
75 | } | |
76 | ||
1da177e4 LT |
77 | /* |
78 | * 'what should we do if we get a hw irq event on an illegal vector'. | |
79 | * each architecture has to answer this themselves. | |
80 | */ | |
81 | void ack_bad_irq(unsigned int irq) | |
82 | { | |
83 | printk("unexpected IRQ trap at vector %02x\n", irq); | |
84 | /* | |
85 | * Currently unexpected vectors happen only on SMP and APIC. | |
86 | * We _must_ ack these because every local APIC has only N | |
87 | * irq slots per priority level, and a 'hanging, unacked' IRQ | |
88 | * holds up an irq slot - in excessive cases (when multiple | |
89 | * unexpected vectors occur) that might lock up the APIC | |
90 | * completely. | |
3777a959 | 91 | * But only ack when the APIC is enabled -AK |
1da177e4 | 92 | */ |
e1a8e6c9 | 93 | if (cpu_has_apic) |
3777a959 | 94 | ack_APIC_irq(); |
1da177e4 LT |
95 | } |
96 | ||
97 | void __init apic_intr_init(void) | |
98 | { | |
99 | #ifdef CONFIG_SMP | |
100 | smp_intr_init(); | |
101 | #endif | |
102 | /* self generated IPI for local APIC timer */ | |
103 | set_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt); | |
104 | ||
105 | /* IPI vectors for APIC spurious and error interrupts */ | |
106 | set_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt); | |
107 | set_intr_gate(ERROR_APIC_VECTOR, error_interrupt); | |
108 | ||
109 | /* thermal monitor LVT interrupt */ | |
110 | #ifdef CONFIG_X86_MCE_P4THERMAL | |
111 | set_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt); | |
112 | #endif | |
113 | } | |
114 | ||
115 | /* Using APIC to generate smp_local_timer_interrupt? */ | |
116 | int using_apic_timer = 0; | |
117 | ||
1da177e4 LT |
118 | static int enabled_via_apicbase; |
119 | ||
120 | void enable_NMI_through_LVT0 (void * dummy) | |
121 | { | |
122 | unsigned int v, ver; | |
123 | ||
124 | ver = apic_read(APIC_LVR); | |
125 | ver = GET_APIC_VERSION(ver); | |
126 | v = APIC_DM_NMI; /* unmask and set to NMI */ | |
127 | if (!APIC_INTEGRATED(ver)) /* 82489DX */ | |
128 | v |= APIC_LVT_LEVEL_TRIGGER; | |
129 | apic_write_around(APIC_LVT0, v); | |
130 | } | |
131 | ||
132 | int get_physical_broadcast(void) | |
133 | { | |
95d769aa | 134 | if (modern_apic()) |
1da177e4 LT |
135 | return 0xff; |
136 | else | |
137 | return 0xf; | |
138 | } | |
139 | ||
140 | int get_maxlvt(void) | |
141 | { | |
142 | unsigned int v, ver, maxlvt; | |
143 | ||
144 | v = apic_read(APIC_LVR); | |
145 | ver = GET_APIC_VERSION(v); | |
146 | /* 82489DXs do not report # of LVT entries. */ | |
147 | maxlvt = APIC_INTEGRATED(ver) ? GET_APIC_MAXLVT(v) : 2; | |
148 | return maxlvt; | |
149 | } | |
150 | ||
151 | void clear_local_APIC(void) | |
152 | { | |
153 | int maxlvt; | |
154 | unsigned long v; | |
155 | ||
156 | maxlvt = get_maxlvt(); | |
157 | ||
158 | /* | |
159 | * Masking an LVT entry on a P6 can trigger a local APIC error | |
160 | * if the vector is zero. Mask LVTERR first to prevent this. | |
161 | */ | |
162 | if (maxlvt >= 3) { | |
163 | v = ERROR_APIC_VECTOR; /* any non-zero vector will do */ | |
164 | apic_write_around(APIC_LVTERR, v | APIC_LVT_MASKED); | |
165 | } | |
166 | /* | |
167 | * Careful: we have to set masks only first to deassert | |
168 | * any level-triggered sources. | |
169 | */ | |
170 | v = apic_read(APIC_LVTT); | |
171 | apic_write_around(APIC_LVTT, v | APIC_LVT_MASKED); | |
172 | v = apic_read(APIC_LVT0); | |
173 | apic_write_around(APIC_LVT0, v | APIC_LVT_MASKED); | |
174 | v = apic_read(APIC_LVT1); | |
175 | apic_write_around(APIC_LVT1, v | APIC_LVT_MASKED); | |
176 | if (maxlvt >= 4) { | |
177 | v = apic_read(APIC_LVTPC); | |
178 | apic_write_around(APIC_LVTPC, v | APIC_LVT_MASKED); | |
179 | } | |
180 | ||
181 | /* lets not touch this if we didn't frob it */ | |
182 | #ifdef CONFIG_X86_MCE_P4THERMAL | |
183 | if (maxlvt >= 5) { | |
184 | v = apic_read(APIC_LVTTHMR); | |
185 | apic_write_around(APIC_LVTTHMR, v | APIC_LVT_MASKED); | |
186 | } | |
187 | #endif | |
188 | /* | |
189 | * Clean APIC state for other OSs: | |
190 | */ | |
191 | apic_write_around(APIC_LVTT, APIC_LVT_MASKED); | |
192 | apic_write_around(APIC_LVT0, APIC_LVT_MASKED); | |
193 | apic_write_around(APIC_LVT1, APIC_LVT_MASKED); | |
194 | if (maxlvt >= 3) | |
195 | apic_write_around(APIC_LVTERR, APIC_LVT_MASKED); | |
196 | if (maxlvt >= 4) | |
197 | apic_write_around(APIC_LVTPC, APIC_LVT_MASKED); | |
198 | ||
199 | #ifdef CONFIG_X86_MCE_P4THERMAL | |
200 | if (maxlvt >= 5) | |
201 | apic_write_around(APIC_LVTTHMR, APIC_LVT_MASKED); | |
202 | #endif | |
203 | v = GET_APIC_VERSION(apic_read(APIC_LVR)); | |
204 | if (APIC_INTEGRATED(v)) { /* !82489DX */ | |
205 | if (maxlvt > 3) /* Due to Pentium errata 3AP and 11AP. */ | |
206 | apic_write(APIC_ESR, 0); | |
207 | apic_read(APIC_ESR); | |
208 | } | |
209 | } | |
210 | ||
211 | void __init connect_bsp_APIC(void) | |
212 | { | |
213 | if (pic_mode) { | |
214 | /* | |
215 | * Do not trust the local APIC being empty at bootup. | |
216 | */ | |
217 | clear_local_APIC(); | |
218 | /* | |
219 | * PIC mode, enable APIC mode in the IMCR, i.e. | |
220 | * connect BSP's local APIC to INT and NMI lines. | |
221 | */ | |
222 | apic_printk(APIC_VERBOSE, "leaving PIC mode, " | |
223 | "enabling APIC mode.\n"); | |
224 | outb(0x70, 0x22); | |
225 | outb(0x01, 0x23); | |
226 | } | |
227 | enable_apic_mode(); | |
228 | } | |
229 | ||
650927ef | 230 | void disconnect_bsp_APIC(int virt_wire_setup) |
1da177e4 LT |
231 | { |
232 | if (pic_mode) { | |
233 | /* | |
234 | * Put the board back into PIC mode (has an effect | |
235 | * only on certain older boards). Note that APIC | |
236 | * interrupts, including IPIs, won't work beyond | |
237 | * this point! The only exception are INIT IPIs. | |
238 | */ | |
239 | apic_printk(APIC_VERBOSE, "disabling APIC mode, " | |
240 | "entering PIC mode.\n"); | |
241 | outb(0x70, 0x22); | |
242 | outb(0x00, 0x23); | |
243 | } | |
650927ef EB |
244 | else { |
245 | /* Go back to Virtual Wire compatibility mode */ | |
246 | unsigned long value; | |
247 | ||
248 | /* For the spurious interrupt use vector F, and enable it */ | |
249 | value = apic_read(APIC_SPIV); | |
250 | value &= ~APIC_VECTOR_MASK; | |
251 | value |= APIC_SPIV_APIC_ENABLED; | |
252 | value |= 0xf; | |
253 | apic_write_around(APIC_SPIV, value); | |
254 | ||
255 | if (!virt_wire_setup) { | |
256 | /* For LVT0 make it edge triggered, active high, external and enabled */ | |
257 | value = apic_read(APIC_LVT0); | |
258 | value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING | | |
259 | APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR | | |
260 | APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED ); | |
261 | value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING; | |
262 | value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_EXTINT); | |
263 | apic_write_around(APIC_LVT0, value); | |
264 | } | |
265 | else { | |
266 | /* Disable LVT0 */ | |
267 | apic_write_around(APIC_LVT0, APIC_LVT_MASKED); | |
268 | } | |
269 | ||
270 | /* For LVT1 make it edge triggered, active high, nmi and enabled */ | |
271 | value = apic_read(APIC_LVT1); | |
272 | value &= ~( | |
273 | APIC_MODE_MASK | APIC_SEND_PENDING | | |
274 | APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR | | |
275 | APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED); | |
276 | value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING; | |
277 | value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_NMI); | |
278 | apic_write_around(APIC_LVT1, value); | |
279 | } | |
1da177e4 LT |
280 | } |
281 | ||
282 | void disable_local_APIC(void) | |
283 | { | |
284 | unsigned long value; | |
285 | ||
286 | clear_local_APIC(); | |
287 | ||
288 | /* | |
289 | * Disable APIC (implies clearing of registers | |
290 | * for 82489DX!). | |
291 | */ | |
292 | value = apic_read(APIC_SPIV); | |
293 | value &= ~APIC_SPIV_APIC_ENABLED; | |
294 | apic_write_around(APIC_SPIV, value); | |
295 | ||
296 | if (enabled_via_apicbase) { | |
297 | unsigned int l, h; | |
298 | rdmsr(MSR_IA32_APICBASE, l, h); | |
299 | l &= ~MSR_IA32_APICBASE_ENABLE; | |
300 | wrmsr(MSR_IA32_APICBASE, l, h); | |
301 | } | |
302 | } | |
303 | ||
304 | /* | |
305 | * This is to verify that we're looking at a real local APIC. | |
306 | * Check these against your board if the CPUs aren't getting | |
307 | * started for no apparent reason. | |
308 | */ | |
309 | int __init verify_local_APIC(void) | |
310 | { | |
311 | unsigned int reg0, reg1; | |
312 | ||
313 | /* | |
314 | * The version register is read-only in a real APIC. | |
315 | */ | |
316 | reg0 = apic_read(APIC_LVR); | |
317 | apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg0); | |
318 | apic_write(APIC_LVR, reg0 ^ APIC_LVR_MASK); | |
319 | reg1 = apic_read(APIC_LVR); | |
320 | apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg1); | |
321 | ||
322 | /* | |
323 | * The two version reads above should print the same | |
324 | * numbers. If the second one is different, then we | |
325 | * poke at a non-APIC. | |
326 | */ | |
327 | if (reg1 != reg0) | |
328 | return 0; | |
329 | ||
330 | /* | |
331 | * Check if the version looks reasonably. | |
332 | */ | |
333 | reg1 = GET_APIC_VERSION(reg0); | |
334 | if (reg1 == 0x00 || reg1 == 0xff) | |
335 | return 0; | |
336 | reg1 = get_maxlvt(); | |
337 | if (reg1 < 0x02 || reg1 == 0xff) | |
338 | return 0; | |
339 | ||
340 | /* | |
341 | * The ID register is read/write in a real APIC. | |
342 | */ | |
343 | reg0 = apic_read(APIC_ID); | |
344 | apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg0); | |
345 | ||
346 | /* | |
347 | * The next two are just to see if we have sane values. | |
348 | * They're only really relevant if we're in Virtual Wire | |
349 | * compatibility mode, but most boxes are anymore. | |
350 | */ | |
351 | reg0 = apic_read(APIC_LVT0); | |
352 | apic_printk(APIC_DEBUG, "Getting LVT0: %x\n", reg0); | |
353 | reg1 = apic_read(APIC_LVT1); | |
354 | apic_printk(APIC_DEBUG, "Getting LVT1: %x\n", reg1); | |
355 | ||
356 | return 1; | |
357 | } | |
358 | ||
359 | void __init sync_Arb_IDs(void) | |
360 | { | |
95d769aa AK |
361 | /* Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 |
362 | And not needed on AMD */ | |
363 | if (modern_apic()) | |
1da177e4 LT |
364 | return; |
365 | /* | |
366 | * Wait for idle. | |
367 | */ | |
368 | apic_wait_icr_idle(); | |
369 | ||
370 | apic_printk(APIC_DEBUG, "Synchronizing Arb IDs.\n"); | |
371 | apic_write_around(APIC_ICR, APIC_DEST_ALLINC | APIC_INT_LEVELTRIG | |
372 | | APIC_DM_INIT); | |
373 | } | |
374 | ||
375 | extern void __error_in_apic_c (void); | |
376 | ||
377 | /* | |
378 | * An initial setup of the virtual wire mode. | |
379 | */ | |
380 | void __init init_bsp_APIC(void) | |
381 | { | |
382 | unsigned long value, ver; | |
383 | ||
384 | /* | |
385 | * Don't do the setup now if we have a SMP BIOS as the | |
386 | * through-I/O-APIC virtual wire mode might be active. | |
387 | */ | |
388 | if (smp_found_config || !cpu_has_apic) | |
389 | return; | |
390 | ||
391 | value = apic_read(APIC_LVR); | |
392 | ver = GET_APIC_VERSION(value); | |
393 | ||
394 | /* | |
395 | * Do not trust the local APIC being empty at bootup. | |
396 | */ | |
397 | clear_local_APIC(); | |
398 | ||
399 | /* | |
400 | * Enable APIC. | |
401 | */ | |
402 | value = apic_read(APIC_SPIV); | |
403 | value &= ~APIC_VECTOR_MASK; | |
404 | value |= APIC_SPIV_APIC_ENABLED; | |
405 | ||
406 | /* This bit is reserved on P4/Xeon and should be cleared */ | |
407 | if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) && (boot_cpu_data.x86 == 15)) | |
408 | value &= ~APIC_SPIV_FOCUS_DISABLED; | |
409 | else | |
410 | value |= APIC_SPIV_FOCUS_DISABLED; | |
411 | value |= SPURIOUS_APIC_VECTOR; | |
412 | apic_write_around(APIC_SPIV, value); | |
413 | ||
414 | /* | |
415 | * Set up the virtual wire mode. | |
416 | */ | |
417 | apic_write_around(APIC_LVT0, APIC_DM_EXTINT); | |
418 | value = APIC_DM_NMI; | |
419 | if (!APIC_INTEGRATED(ver)) /* 82489DX */ | |
420 | value |= APIC_LVT_LEVEL_TRIGGER; | |
421 | apic_write_around(APIC_LVT1, value); | |
422 | } | |
423 | ||
0bb3184d | 424 | void __devinit setup_local_APIC(void) |
1da177e4 LT |
425 | { |
426 | unsigned long oldvalue, value, ver, maxlvt; | |
1a75a3f0 | 427 | int i, j; |
1da177e4 LT |
428 | |
429 | /* Pound the ESR really hard over the head with a big hammer - mbligh */ | |
430 | if (esr_disable) { | |
431 | apic_write(APIC_ESR, 0); | |
432 | apic_write(APIC_ESR, 0); | |
433 | apic_write(APIC_ESR, 0); | |
434 | apic_write(APIC_ESR, 0); | |
435 | } | |
436 | ||
437 | value = apic_read(APIC_LVR); | |
438 | ver = GET_APIC_VERSION(value); | |
439 | ||
440 | if ((SPURIOUS_APIC_VECTOR & 0x0f) != 0x0f) | |
441 | __error_in_apic_c(); | |
442 | ||
443 | /* | |
444 | * Double-check whether this APIC is really registered. | |
445 | */ | |
446 | if (!apic_id_registered()) | |
447 | BUG(); | |
448 | ||
449 | /* | |
450 | * Intel recommends to set DFR, LDR and TPR before enabling | |
451 | * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel | |
452 | * document number 292116). So here it goes... | |
453 | */ | |
454 | init_apic_ldr(); | |
455 | ||
456 | /* | |
457 | * Set Task Priority to 'accept all'. We never change this | |
458 | * later on. | |
459 | */ | |
460 | value = apic_read(APIC_TASKPRI); | |
461 | value &= ~APIC_TPRI_MASK; | |
462 | apic_write_around(APIC_TASKPRI, value); | |
463 | ||
1a75a3f0 VG |
464 | /* |
465 | * After a crash, we no longer service the interrupts and a pending | |
466 | * interrupt from previous kernel might still have ISR bit set. | |
467 | * | |
468 | * Most probably by now CPU has serviced that pending interrupt and | |
469 | * it might not have done the ack_APIC_irq() because it thought, | |
470 | * interrupt came from i8259 as ExtInt. LAPIC did not get EOI so it | |
471 | * does not clear the ISR bit and cpu thinks it has already serivced | |
472 | * the interrupt. Hence a vector might get locked. It was noticed | |
473 | * for timer irq (vector 0x31). Issue an extra EOI to clear ISR. | |
474 | */ | |
475 | for (i = APIC_ISR_NR - 1; i >= 0; i--) { | |
476 | value = apic_read(APIC_ISR + i*0x10); | |
477 | for (j = 31; j >= 0; j--) { | |
478 | if (value & (1<<j)) | |
479 | ack_APIC_irq(); | |
480 | } | |
481 | } | |
482 | ||
1da177e4 LT |
483 | /* |
484 | * Now that we are all set up, enable the APIC | |
485 | */ | |
486 | value = apic_read(APIC_SPIV); | |
487 | value &= ~APIC_VECTOR_MASK; | |
488 | /* | |
489 | * Enable APIC | |
490 | */ | |
491 | value |= APIC_SPIV_APIC_ENABLED; | |
492 | ||
493 | /* | |
494 | * Some unknown Intel IO/APIC (or APIC) errata is biting us with | |
495 | * certain networking cards. If high frequency interrupts are | |
496 | * happening on a particular IOAPIC pin, plus the IOAPIC routing | |
497 | * entry is masked/unmasked at a high rate as well then sooner or | |
498 | * later IOAPIC line gets 'stuck', no more interrupts are received | |
499 | * from the device. If focus CPU is disabled then the hang goes | |
500 | * away, oh well :-( | |
501 | * | |
502 | * [ This bug can be reproduced easily with a level-triggered | |
503 | * PCI Ne2000 networking cards and PII/PIII processors, dual | |
504 | * BX chipset. ] | |
505 | */ | |
506 | /* | |
507 | * Actually disabling the focus CPU check just makes the hang less | |
508 | * frequent as it makes the interrupt distributon model be more | |
509 | * like LRU than MRU (the short-term load is more even across CPUs). | |
510 | * See also the comment in end_level_ioapic_irq(). --macro | |
511 | */ | |
512 | #if 1 | |
513 | /* Enable focus processor (bit==0) */ | |
514 | value &= ~APIC_SPIV_FOCUS_DISABLED; | |
515 | #else | |
516 | /* Disable focus processor (bit==1) */ | |
517 | value |= APIC_SPIV_FOCUS_DISABLED; | |
518 | #endif | |
519 | /* | |
520 | * Set spurious IRQ vector | |
521 | */ | |
522 | value |= SPURIOUS_APIC_VECTOR; | |
523 | apic_write_around(APIC_SPIV, value); | |
524 | ||
525 | /* | |
526 | * Set up LVT0, LVT1: | |
527 | * | |
528 | * set up through-local-APIC on the BP's LINT0. This is not | |
529 | * strictly necessery in pure symmetric-IO mode, but sometimes | |
530 | * we delegate interrupts to the 8259A. | |
531 | */ | |
532 | /* | |
533 | * TODO: set up through-local-APIC from through-I/O-APIC? --macro | |
534 | */ | |
535 | value = apic_read(APIC_LVT0) & APIC_LVT_MASKED; | |
536 | if (!smp_processor_id() && (pic_mode || !value)) { | |
537 | value = APIC_DM_EXTINT; | |
538 | apic_printk(APIC_VERBOSE, "enabled ExtINT on CPU#%d\n", | |
539 | smp_processor_id()); | |
540 | } else { | |
541 | value = APIC_DM_EXTINT | APIC_LVT_MASKED; | |
542 | apic_printk(APIC_VERBOSE, "masked ExtINT on CPU#%d\n", | |
543 | smp_processor_id()); | |
544 | } | |
545 | apic_write_around(APIC_LVT0, value); | |
546 | ||
547 | /* | |
548 | * only the BP should see the LINT1 NMI signal, obviously. | |
549 | */ | |
550 | if (!smp_processor_id()) | |
551 | value = APIC_DM_NMI; | |
552 | else | |
553 | value = APIC_DM_NMI | APIC_LVT_MASKED; | |
554 | if (!APIC_INTEGRATED(ver)) /* 82489DX */ | |
555 | value |= APIC_LVT_LEVEL_TRIGGER; | |
556 | apic_write_around(APIC_LVT1, value); | |
557 | ||
558 | if (APIC_INTEGRATED(ver) && !esr_disable) { /* !82489DX */ | |
559 | maxlvt = get_maxlvt(); | |
560 | if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */ | |
561 | apic_write(APIC_ESR, 0); | |
562 | oldvalue = apic_read(APIC_ESR); | |
563 | ||
564 | value = ERROR_APIC_VECTOR; // enables sending errors | |
565 | apic_write_around(APIC_LVTERR, value); | |
566 | /* | |
567 | * spec says clear errors after enabling vector. | |
568 | */ | |
569 | if (maxlvt > 3) | |
570 | apic_write(APIC_ESR, 0); | |
571 | value = apic_read(APIC_ESR); | |
572 | if (value != oldvalue) | |
573 | apic_printk(APIC_VERBOSE, "ESR value before enabling " | |
574 | "vector: 0x%08lx after: 0x%08lx\n", | |
575 | oldvalue, value); | |
576 | } else { | |
577 | if (esr_disable) | |
578 | /* | |
579 | * Something untraceble is creating bad interrupts on | |
580 | * secondary quads ... for the moment, just leave the | |
581 | * ESR disabled - we can't do anything useful with the | |
582 | * errors anyway - mbligh | |
583 | */ | |
584 | printk("Leaving ESR disabled.\n"); | |
585 | else | |
586 | printk("No ESR for 82489DX.\n"); | |
587 | } | |
588 | ||
589 | if (nmi_watchdog == NMI_LOCAL_APIC) | |
590 | setup_apic_nmi_watchdog(); | |
591 | apic_pm_activate(); | |
592 | } | |
593 | ||
594 | /* | |
595 | * If Linux enabled the LAPIC against the BIOS default | |
596 | * disable it down before re-entering the BIOS on shutdown. | |
597 | * Otherwise the BIOS may get confused and not power-off. | |
77f72b19 ZM |
598 | * Additionally clear all LVT entries before disable_local_APIC |
599 | * for the case where Linux didn't enable the LAPIC. | |
1da177e4 LT |
600 | */ |
601 | void lapic_shutdown(void) | |
602 | { | |
67963132 MS |
603 | unsigned long flags; |
604 | ||
77f72b19 | 605 | if (!cpu_has_apic) |
1da177e4 LT |
606 | return; |
607 | ||
67963132 | 608 | local_irq_save(flags); |
77f72b19 ZM |
609 | clear_local_APIC(); |
610 | ||
611 | if (enabled_via_apicbase) | |
612 | disable_local_APIC(); | |
613 | ||
67963132 | 614 | local_irq_restore(flags); |
1da177e4 LT |
615 | } |
616 | ||
617 | #ifdef CONFIG_PM | |
618 | ||
619 | static struct { | |
620 | int active; | |
621 | /* r/w apic fields */ | |
622 | unsigned int apic_id; | |
623 | unsigned int apic_taskpri; | |
624 | unsigned int apic_ldr; | |
625 | unsigned int apic_dfr; | |
626 | unsigned int apic_spiv; | |
627 | unsigned int apic_lvtt; | |
628 | unsigned int apic_lvtpc; | |
629 | unsigned int apic_lvt0; | |
630 | unsigned int apic_lvt1; | |
631 | unsigned int apic_lvterr; | |
632 | unsigned int apic_tmict; | |
633 | unsigned int apic_tdcr; | |
634 | unsigned int apic_thmr; | |
635 | } apic_pm_state; | |
636 | ||
438510f6 | 637 | static int lapic_suspend(struct sys_device *dev, pm_message_t state) |
1da177e4 LT |
638 | { |
639 | unsigned long flags; | |
640 | ||
641 | if (!apic_pm_state.active) | |
642 | return 0; | |
643 | ||
644 | apic_pm_state.apic_id = apic_read(APIC_ID); | |
645 | apic_pm_state.apic_taskpri = apic_read(APIC_TASKPRI); | |
646 | apic_pm_state.apic_ldr = apic_read(APIC_LDR); | |
647 | apic_pm_state.apic_dfr = apic_read(APIC_DFR); | |
648 | apic_pm_state.apic_spiv = apic_read(APIC_SPIV); | |
649 | apic_pm_state.apic_lvtt = apic_read(APIC_LVTT); | |
650 | apic_pm_state.apic_lvtpc = apic_read(APIC_LVTPC); | |
651 | apic_pm_state.apic_lvt0 = apic_read(APIC_LVT0); | |
652 | apic_pm_state.apic_lvt1 = apic_read(APIC_LVT1); | |
653 | apic_pm_state.apic_lvterr = apic_read(APIC_LVTERR); | |
654 | apic_pm_state.apic_tmict = apic_read(APIC_TMICT); | |
655 | apic_pm_state.apic_tdcr = apic_read(APIC_TDCR); | |
656 | apic_pm_state.apic_thmr = apic_read(APIC_LVTTHMR); | |
657 | ||
658 | local_irq_save(flags); | |
659 | disable_local_APIC(); | |
660 | local_irq_restore(flags); | |
661 | return 0; | |
662 | } | |
663 | ||
664 | static int lapic_resume(struct sys_device *dev) | |
665 | { | |
666 | unsigned int l, h; | |
667 | unsigned long flags; | |
668 | ||
669 | if (!apic_pm_state.active) | |
670 | return 0; | |
671 | ||
672 | local_irq_save(flags); | |
673 | ||
674 | /* | |
675 | * Make sure the APICBASE points to the right address | |
676 | * | |
677 | * FIXME! This will be wrong if we ever support suspend on | |
678 | * SMP! We'll need to do this as part of the CPU restore! | |
679 | */ | |
680 | rdmsr(MSR_IA32_APICBASE, l, h); | |
681 | l &= ~MSR_IA32_APICBASE_BASE; | |
682 | l |= MSR_IA32_APICBASE_ENABLE | mp_lapic_addr; | |
683 | wrmsr(MSR_IA32_APICBASE, l, h); | |
684 | ||
685 | apic_write(APIC_LVTERR, ERROR_APIC_VECTOR | APIC_LVT_MASKED); | |
686 | apic_write(APIC_ID, apic_pm_state.apic_id); | |
687 | apic_write(APIC_DFR, apic_pm_state.apic_dfr); | |
688 | apic_write(APIC_LDR, apic_pm_state.apic_ldr); | |
689 | apic_write(APIC_TASKPRI, apic_pm_state.apic_taskpri); | |
690 | apic_write(APIC_SPIV, apic_pm_state.apic_spiv); | |
691 | apic_write(APIC_LVT0, apic_pm_state.apic_lvt0); | |
692 | apic_write(APIC_LVT1, apic_pm_state.apic_lvt1); | |
693 | apic_write(APIC_LVTTHMR, apic_pm_state.apic_thmr); | |
694 | apic_write(APIC_LVTPC, apic_pm_state.apic_lvtpc); | |
695 | apic_write(APIC_LVTT, apic_pm_state.apic_lvtt); | |
696 | apic_write(APIC_TDCR, apic_pm_state.apic_tdcr); | |
697 | apic_write(APIC_TMICT, apic_pm_state.apic_tmict); | |
698 | apic_write(APIC_ESR, 0); | |
699 | apic_read(APIC_ESR); | |
700 | apic_write(APIC_LVTERR, apic_pm_state.apic_lvterr); | |
701 | apic_write(APIC_ESR, 0); | |
702 | apic_read(APIC_ESR); | |
703 | local_irq_restore(flags); | |
704 | return 0; | |
705 | } | |
706 | ||
707 | /* | |
708 | * This device has no shutdown method - fully functioning local APICs | |
709 | * are needed on every CPU up until machine_halt/restart/poweroff. | |
710 | */ | |
711 | ||
712 | static struct sysdev_class lapic_sysclass = { | |
713 | set_kset_name("lapic"), | |
714 | .resume = lapic_resume, | |
715 | .suspend = lapic_suspend, | |
716 | }; | |
717 | ||
718 | static struct sys_device device_lapic = { | |
719 | .id = 0, | |
720 | .cls = &lapic_sysclass, | |
721 | }; | |
722 | ||
0bb3184d | 723 | static void __devinit apic_pm_activate(void) |
1da177e4 LT |
724 | { |
725 | apic_pm_state.active = 1; | |
726 | } | |
727 | ||
728 | static int __init init_lapic_sysfs(void) | |
729 | { | |
730 | int error; | |
731 | ||
732 | if (!cpu_has_apic) | |
733 | return 0; | |
734 | /* XXX: remove suspend/resume procs if !apic_pm_state.active? */ | |
735 | ||
736 | error = sysdev_class_register(&lapic_sysclass); | |
737 | if (!error) | |
738 | error = sysdev_register(&device_lapic); | |
739 | return error; | |
740 | } | |
741 | device_initcall(init_lapic_sysfs); | |
742 | ||
743 | #else /* CONFIG_PM */ | |
744 | ||
745 | static void apic_pm_activate(void) { } | |
746 | ||
747 | #endif /* CONFIG_PM */ | |
748 | ||
749 | /* | |
750 | * Detect and enable local APICs on non-SMP boards. | |
751 | * Original code written by Keir Fraser. | |
752 | */ | |
753 | ||
1da177e4 LT |
754 | static int __init apic_set_verbosity(char *str) |
755 | { | |
756 | if (strcmp("debug", str) == 0) | |
757 | apic_verbosity = APIC_DEBUG; | |
758 | else if (strcmp("verbose", str) == 0) | |
759 | apic_verbosity = APIC_VERBOSE; | |
760 | else | |
761 | printk(KERN_WARNING "APIC Verbosity level %s not recognised" | |
e31b88ba | 762 | " use apic=verbose or apic=debug\n", str); |
1da177e4 | 763 | |
9b41046c | 764 | return 1; |
1da177e4 LT |
765 | } |
766 | ||
767 | __setup("apic=", apic_set_verbosity); | |
768 | ||
769 | static int __init detect_init_APIC (void) | |
770 | { | |
771 | u32 h, l, features; | |
1da177e4 LT |
772 | |
773 | /* Disabled by kernel option? */ | |
774 | if (enable_local_apic < 0) | |
775 | return -1; | |
776 | ||
1da177e4 LT |
777 | switch (boot_cpu_data.x86_vendor) { |
778 | case X86_VENDOR_AMD: | |
779 | if ((boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model > 1) || | |
780 | (boot_cpu_data.x86 == 15)) | |
781 | break; | |
782 | goto no_apic; | |
783 | case X86_VENDOR_INTEL: | |
784 | if (boot_cpu_data.x86 == 6 || boot_cpu_data.x86 == 15 || | |
785 | (boot_cpu_data.x86 == 5 && cpu_has_apic)) | |
786 | break; | |
787 | goto no_apic; | |
788 | default: | |
789 | goto no_apic; | |
790 | } | |
791 | ||
792 | if (!cpu_has_apic) { | |
793 | /* | |
794 | * Over-ride BIOS and try to enable the local | |
795 | * APIC only if "lapic" specified. | |
796 | */ | |
797 | if (enable_local_apic <= 0) { | |
798 | printk("Local APIC disabled by BIOS -- " | |
799 | "you can enable it with \"lapic\"\n"); | |
800 | return -1; | |
801 | } | |
802 | /* | |
803 | * Some BIOSes disable the local APIC in the | |
804 | * APIC_BASE MSR. This can only be done in | |
805 | * software for Intel P6 or later and AMD K7 | |
806 | * (Model > 1) or later. | |
807 | */ | |
808 | rdmsr(MSR_IA32_APICBASE, l, h); | |
809 | if (!(l & MSR_IA32_APICBASE_ENABLE)) { | |
810 | printk("Local APIC disabled by BIOS -- reenabling.\n"); | |
811 | l &= ~MSR_IA32_APICBASE_BASE; | |
812 | l |= MSR_IA32_APICBASE_ENABLE | APIC_DEFAULT_PHYS_BASE; | |
813 | wrmsr(MSR_IA32_APICBASE, l, h); | |
814 | enabled_via_apicbase = 1; | |
815 | } | |
816 | } | |
817 | /* | |
818 | * The APIC feature bit should now be enabled | |
819 | * in `cpuid' | |
820 | */ | |
821 | features = cpuid_edx(1); | |
822 | if (!(features & (1 << X86_FEATURE_APIC))) { | |
823 | printk("Could not enable APIC!\n"); | |
824 | return -1; | |
825 | } | |
826 | set_bit(X86_FEATURE_APIC, boot_cpu_data.x86_capability); | |
827 | mp_lapic_addr = APIC_DEFAULT_PHYS_BASE; | |
828 | ||
829 | /* The BIOS may have set up the APIC at some other address */ | |
830 | rdmsr(MSR_IA32_APICBASE, l, h); | |
831 | if (l & MSR_IA32_APICBASE_ENABLE) | |
832 | mp_lapic_addr = l & MSR_IA32_APICBASE_BASE; | |
833 | ||
834 | if (nmi_watchdog != NMI_NONE) | |
835 | nmi_watchdog = NMI_LOCAL_APIC; | |
836 | ||
837 | printk("Found and enabled local APIC!\n"); | |
838 | ||
839 | apic_pm_activate(); | |
840 | ||
841 | return 0; | |
842 | ||
843 | no_apic: | |
844 | printk("No local APIC present or hardware disabled\n"); | |
845 | return -1; | |
846 | } | |
847 | ||
848 | void __init init_apic_mappings(void) | |
849 | { | |
850 | unsigned long apic_phys; | |
851 | ||
852 | /* | |
853 | * If no local APIC can be found then set up a fake all | |
854 | * zeroes page to simulate the local APIC and another | |
855 | * one for the IO-APIC. | |
856 | */ | |
857 | if (!smp_found_config && detect_init_APIC()) { | |
858 | apic_phys = (unsigned long) alloc_bootmem_pages(PAGE_SIZE); | |
859 | apic_phys = __pa(apic_phys); | |
860 | } else | |
861 | apic_phys = mp_lapic_addr; | |
862 | ||
863 | set_fixmap_nocache(FIX_APIC_BASE, apic_phys); | |
864 | printk(KERN_DEBUG "mapped APIC to %08lx (%08lx)\n", APIC_BASE, | |
865 | apic_phys); | |
866 | ||
867 | /* | |
868 | * Fetch the APIC ID of the BSP in case we have a | |
869 | * default configuration (or the MP table is broken). | |
870 | */ | |
1e4c85f9 LT |
871 | if (boot_cpu_physical_apicid == -1U) |
872 | boot_cpu_physical_apicid = GET_APIC_ID(apic_read(APIC_ID)); | |
1da177e4 LT |
873 | |
874 | #ifdef CONFIG_X86_IO_APIC | |
875 | { | |
876 | unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0; | |
877 | int i; | |
878 | ||
879 | for (i = 0; i < nr_ioapics; i++) { | |
880 | if (smp_found_config) { | |
881 | ioapic_phys = mp_ioapics[i].mpc_apicaddr; | |
882 | if (!ioapic_phys) { | |
883 | printk(KERN_ERR | |
884 | "WARNING: bogus zero IO-APIC " | |
885 | "address found in MPTABLE, " | |
886 | "disabling IO/APIC support!\n"); | |
887 | smp_found_config = 0; | |
888 | skip_ioapic_setup = 1; | |
889 | goto fake_ioapic_page; | |
890 | } | |
891 | } else { | |
892 | fake_ioapic_page: | |
893 | ioapic_phys = (unsigned long) | |
894 | alloc_bootmem_pages(PAGE_SIZE); | |
895 | ioapic_phys = __pa(ioapic_phys); | |
896 | } | |
897 | set_fixmap_nocache(idx, ioapic_phys); | |
898 | printk(KERN_DEBUG "mapped IOAPIC to %08lx (%08lx)\n", | |
899 | __fix_to_virt(idx), ioapic_phys); | |
900 | idx++; | |
901 | } | |
902 | } | |
903 | #endif | |
904 | } | |
905 | ||
906 | /* | |
907 | * This part sets up the APIC 32 bit clock in LVTT1, with HZ interrupts | |
908 | * per second. We assume that the caller has already set up the local | |
909 | * APIC. | |
910 | * | |
911 | * The APIC timer is not exactly sync with the external timer chip, it | |
912 | * closely follows bus clocks. | |
913 | */ | |
914 | ||
915 | /* | |
916 | * The timer chip is already set up at HZ interrupts per second here, | |
917 | * but we do not accept timer interrupts yet. We only allow the BP | |
918 | * to calibrate. | |
919 | */ | |
0bb3184d | 920 | static unsigned int __devinit get_8254_timer_count(void) |
1da177e4 | 921 | { |
1da177e4 LT |
922 | unsigned long flags; |
923 | ||
924 | unsigned int count; | |
925 | ||
926 | spin_lock_irqsave(&i8253_lock, flags); | |
927 | ||
928 | outb_p(0x00, PIT_MODE); | |
929 | count = inb_p(PIT_CH0); | |
930 | count |= inb_p(PIT_CH0) << 8; | |
931 | ||
932 | spin_unlock_irqrestore(&i8253_lock, flags); | |
933 | ||
934 | return count; | |
935 | } | |
936 | ||
937 | /* next tick in 8254 can be caught by catching timer wraparound */ | |
0bb3184d | 938 | static void __devinit wait_8254_wraparound(void) |
1da177e4 LT |
939 | { |
940 | unsigned int curr_count, prev_count; | |
941 | ||
942 | curr_count = get_8254_timer_count(); | |
943 | do { | |
944 | prev_count = curr_count; | |
945 | curr_count = get_8254_timer_count(); | |
946 | ||
947 | /* workaround for broken Mercury/Neptune */ | |
948 | if (prev_count >= curr_count + 0x100) | |
949 | curr_count = get_8254_timer_count(); | |
950 | ||
951 | } while (prev_count >= curr_count); | |
952 | } | |
953 | ||
954 | /* | |
955 | * Default initialization for 8254 timers. If we use other timers like HPET, | |
956 | * we override this later | |
957 | */ | |
0bb3184d | 958 | void (*wait_timer_tick)(void) __devinitdata = wait_8254_wraparound; |
1da177e4 LT |
959 | |
960 | /* | |
961 | * This function sets up the local APIC timer, with a timeout of | |
962 | * 'clocks' APIC bus clock. During calibration we actually call | |
963 | * this function twice on the boot CPU, once with a bogus timeout | |
964 | * value, second time for real. The other (noncalibrating) CPUs | |
965 | * call this function only once, with the real, calibrated value. | |
966 | * | |
967 | * We do reads before writes even if unnecessary, to get around the | |
968 | * P5 APIC double write bug. | |
969 | */ | |
970 | ||
971 | #define APIC_DIVISOR 16 | |
972 | ||
973 | static void __setup_APIC_LVTT(unsigned int clocks) | |
974 | { | |
975 | unsigned int lvtt_value, tmp_value, ver; | |
6eb0a0fd | 976 | int cpu = smp_processor_id(); |
1da177e4 LT |
977 | |
978 | ver = GET_APIC_VERSION(apic_read(APIC_LVR)); | |
979 | lvtt_value = APIC_LVT_TIMER_PERIODIC | LOCAL_TIMER_VECTOR; | |
980 | if (!APIC_INTEGRATED(ver)) | |
981 | lvtt_value |= SET_APIC_TIMER_BASE(APIC_TIMER_BASE_DIV); | |
6eb0a0fd VP |
982 | |
983 | if (cpu_isset(cpu, timer_bcast_ipi)) | |
984 | lvtt_value |= APIC_LVT_MASKED; | |
985 | ||
1da177e4 LT |
986 | apic_write_around(APIC_LVTT, lvtt_value); |
987 | ||
988 | /* | |
989 | * Divide PICLK by 16 | |
990 | */ | |
991 | tmp_value = apic_read(APIC_TDCR); | |
992 | apic_write_around(APIC_TDCR, (tmp_value | |
993 | & ~(APIC_TDR_DIV_1 | APIC_TDR_DIV_TMBASE)) | |
994 | | APIC_TDR_DIV_16); | |
995 | ||
996 | apic_write_around(APIC_TMICT, clocks/APIC_DIVISOR); | |
997 | } | |
998 | ||
0bb3184d | 999 | static void __devinit setup_APIC_timer(unsigned int clocks) |
1da177e4 LT |
1000 | { |
1001 | unsigned long flags; | |
1002 | ||
1003 | local_irq_save(flags); | |
1004 | ||
1005 | /* | |
1006 | * Wait for IRQ0's slice: | |
1007 | */ | |
1008 | wait_timer_tick(); | |
1009 | ||
1010 | __setup_APIC_LVTT(clocks); | |
1011 | ||
1012 | local_irq_restore(flags); | |
1013 | } | |
1014 | ||
1015 | /* | |
1016 | * In this function we calibrate APIC bus clocks to the external | |
1017 | * timer. Unfortunately we cannot use jiffies and the timer irq | |
1018 | * to calibrate, since some later bootup code depends on getting | |
1019 | * the first irq? Ugh. | |
1020 | * | |
1021 | * We want to do the calibration only once since we | |
1022 | * want to have local timer irqs syncron. CPUs connected | |
1023 | * by the same APIC bus have the very same bus frequency. | |
1024 | * And we want to have irqs off anyways, no accidental | |
1025 | * APIC irq that way. | |
1026 | */ | |
1027 | ||
1028 | static int __init calibrate_APIC_clock(void) | |
1029 | { | |
1030 | unsigned long long t1 = 0, t2 = 0; | |
1031 | long tt1, tt2; | |
1032 | long result; | |
1033 | int i; | |
1034 | const int LOOPS = HZ/10; | |
1035 | ||
1036 | apic_printk(APIC_VERBOSE, "calibrating APIC timer ...\n"); | |
1037 | ||
1038 | /* | |
1039 | * Put whatever arbitrary (but long enough) timeout | |
1040 | * value into the APIC clock, we just want to get the | |
1041 | * counter running for calibration. | |
1042 | */ | |
1043 | __setup_APIC_LVTT(1000000000); | |
1044 | ||
1045 | /* | |
1046 | * The timer chip counts down to zero. Let's wait | |
1047 | * for a wraparound to start exact measurement: | |
1048 | * (the current tick might have been already half done) | |
1049 | */ | |
1050 | ||
1051 | wait_timer_tick(); | |
1052 | ||
1053 | /* | |
1054 | * We wrapped around just now. Let's start: | |
1055 | */ | |
1056 | if (cpu_has_tsc) | |
1057 | rdtscll(t1); | |
1058 | tt1 = apic_read(APIC_TMCCT); | |
1059 | ||
1060 | /* | |
1061 | * Let's wait LOOPS wraprounds: | |
1062 | */ | |
1063 | for (i = 0; i < LOOPS; i++) | |
1064 | wait_timer_tick(); | |
1065 | ||
1066 | tt2 = apic_read(APIC_TMCCT); | |
1067 | if (cpu_has_tsc) | |
1068 | rdtscll(t2); | |
1069 | ||
1070 | /* | |
1071 | * The APIC bus clock counter is 32 bits only, it | |
1072 | * might have overflown, but note that we use signed | |
1073 | * longs, thus no extra care needed. | |
1074 | * | |
1075 | * underflown to be exact, as the timer counts down ;) | |
1076 | */ | |
1077 | ||
1078 | result = (tt1-tt2)*APIC_DIVISOR/LOOPS; | |
1079 | ||
1080 | if (cpu_has_tsc) | |
1081 | apic_printk(APIC_VERBOSE, "..... CPU clock speed is " | |
1082 | "%ld.%04ld MHz.\n", | |
1083 | ((long)(t2-t1)/LOOPS)/(1000000/HZ), | |
1084 | ((long)(t2-t1)/LOOPS)%(1000000/HZ)); | |
1085 | ||
1086 | apic_printk(APIC_VERBOSE, "..... host bus clock speed is " | |
1087 | "%ld.%04ld MHz.\n", | |
1088 | result/(1000000/HZ), | |
1089 | result%(1000000/HZ)); | |
1090 | ||
1091 | return result; | |
1092 | } | |
1093 | ||
1094 | static unsigned int calibration_result; | |
1095 | ||
1096 | void __init setup_boot_APIC_clock(void) | |
1097 | { | |
f2b36db6 | 1098 | unsigned long flags; |
1da177e4 LT |
1099 | apic_printk(APIC_VERBOSE, "Using local APIC timer interrupts.\n"); |
1100 | using_apic_timer = 1; | |
1101 | ||
f2b36db6 | 1102 | local_irq_save(flags); |
1da177e4 LT |
1103 | |
1104 | calibration_result = calibrate_APIC_clock(); | |
1105 | /* | |
1106 | * Now set up the timer for real. | |
1107 | */ | |
1108 | setup_APIC_timer(calibration_result); | |
1109 | ||
f2b36db6 | 1110 | local_irq_restore(flags); |
1da177e4 LT |
1111 | } |
1112 | ||
0bb3184d | 1113 | void __devinit setup_secondary_APIC_clock(void) |
1da177e4 LT |
1114 | { |
1115 | setup_APIC_timer(calibration_result); | |
1116 | } | |
1117 | ||
6eb0a0fd | 1118 | void disable_APIC_timer(void) |
1da177e4 LT |
1119 | { |
1120 | if (using_apic_timer) { | |
1121 | unsigned long v; | |
1122 | ||
1123 | v = apic_read(APIC_LVTT); | |
1124 | apic_write_around(APIC_LVTT, v | APIC_LVT_MASKED); | |
1125 | } | |
1126 | } | |
1127 | ||
1128 | void enable_APIC_timer(void) | |
1129 | { | |
6eb0a0fd VP |
1130 | int cpu = smp_processor_id(); |
1131 | ||
1132 | if (using_apic_timer && | |
1133 | !cpu_isset(cpu, timer_bcast_ipi)) { | |
1da177e4 LT |
1134 | unsigned long v; |
1135 | ||
1136 | v = apic_read(APIC_LVTT); | |
1137 | apic_write_around(APIC_LVTT, v & ~APIC_LVT_MASKED); | |
1138 | } | |
1139 | } | |
1140 | ||
6eb0a0fd VP |
1141 | void switch_APIC_timer_to_ipi(void *cpumask) |
1142 | { | |
1143 | cpumask_t mask = *(cpumask_t *)cpumask; | |
1144 | int cpu = smp_processor_id(); | |
1145 | ||
1146 | if (cpu_isset(cpu, mask) && | |
1147 | !cpu_isset(cpu, timer_bcast_ipi)) { | |
1148 | disable_APIC_timer(); | |
1149 | cpu_set(cpu, timer_bcast_ipi); | |
1150 | } | |
1151 | } | |
1152 | EXPORT_SYMBOL(switch_APIC_timer_to_ipi); | |
1153 | ||
1154 | void switch_ipi_to_APIC_timer(void *cpumask) | |
1155 | { | |
1156 | cpumask_t mask = *(cpumask_t *)cpumask; | |
1157 | int cpu = smp_processor_id(); | |
1158 | ||
1159 | if (cpu_isset(cpu, mask) && | |
1160 | cpu_isset(cpu, timer_bcast_ipi)) { | |
1161 | cpu_clear(cpu, timer_bcast_ipi); | |
1162 | enable_APIC_timer(); | |
1163 | } | |
1164 | } | |
1165 | EXPORT_SYMBOL(switch_ipi_to_APIC_timer); | |
1166 | ||
1da177e4 LT |
1167 | #undef APIC_DIVISOR |
1168 | ||
1169 | /* | |
1170 | * Local timer interrupt handler. It does both profiling and | |
1171 | * process statistics/rescheduling. | |
1172 | * | |
1173 | * We do profiling in every local tick, statistics/rescheduling | |
1174 | * happen only every 'profiling multiplier' ticks. The default | |
1175 | * multiplier is 1 and it can be changed by writing the new multiplier | |
1176 | * value into /proc/profile. | |
1177 | */ | |
1178 | ||
1179 | inline void smp_local_timer_interrupt(struct pt_regs * regs) | |
1180 | { | |
1da177e4 | 1181 | profile_tick(CPU_PROFILING, regs); |
1da177e4 | 1182 | #ifdef CONFIG_SMP |
5a07a30c | 1183 | update_process_times(user_mode_vm(regs)); |
1da177e4 | 1184 | #endif |
1da177e4 LT |
1185 | |
1186 | /* | |
1187 | * We take the 'long' return path, and there every subsystem | |
1188 | * grabs the apropriate locks (kernel lock/ irq lock). | |
1189 | * | |
1190 | * we might want to decouple profiling from the 'long path', | |
1191 | * and do the profiling totally in assembly. | |
1192 | * | |
1193 | * Currently this isn't too much of an issue (performance wise), | |
1194 | * we can take more than 100K local irqs per second on a 100 MHz P5. | |
1195 | */ | |
1196 | } | |
1197 | ||
1198 | /* | |
1199 | * Local APIC timer interrupt. This is the most natural way for doing | |
1200 | * local interrupts, but local timer interrupts can be emulated by | |
1201 | * broadcast interrupts too. [in case the hw doesn't support APIC timers] | |
1202 | * | |
1203 | * [ if a single-CPU system runs an SMP kernel then we call the local | |
1204 | * interrupt as well. Thus we cannot inline the local irq ... ] | |
1205 | */ | |
1206 | ||
1207 | fastcall void smp_apic_timer_interrupt(struct pt_regs *regs) | |
1208 | { | |
1209 | int cpu = smp_processor_id(); | |
1210 | ||
1211 | /* | |
1212 | * the NMI deadlock-detector uses this. | |
1213 | */ | |
1214 | per_cpu(irq_stat, cpu).apic_timer_irqs++; | |
1215 | ||
1216 | /* | |
1217 | * NOTE! We'd better ACK the irq immediately, | |
1218 | * because timer handling can be slow. | |
1219 | */ | |
1220 | ack_APIC_irq(); | |
1221 | /* | |
1222 | * update_process_times() expects us to have done irq_enter(). | |
1223 | * Besides, if we don't timer interrupts ignore the global | |
1224 | * interrupt lock, which is the WrongThing (tm) to do. | |
1225 | */ | |
1226 | irq_enter(); | |
1227 | smp_local_timer_interrupt(regs); | |
1228 | irq_exit(); | |
1229 | } | |
1230 | ||
6eb0a0fd VP |
1231 | #ifndef CONFIG_SMP |
1232 | static void up_apic_timer_interrupt_call(struct pt_regs *regs) | |
1233 | { | |
1234 | int cpu = smp_processor_id(); | |
1235 | ||
1236 | /* | |
1237 | * the NMI deadlock-detector uses this. | |
1238 | */ | |
1239 | per_cpu(irq_stat, cpu).apic_timer_irqs++; | |
1240 | ||
1241 | smp_local_timer_interrupt(regs); | |
1242 | } | |
1243 | #endif | |
1244 | ||
1245 | void smp_send_timer_broadcast_ipi(struct pt_regs *regs) | |
1246 | { | |
1247 | cpumask_t mask; | |
1248 | ||
1249 | cpus_and(mask, cpu_online_map, timer_bcast_ipi); | |
1250 | if (!cpus_empty(mask)) { | |
1251 | #ifdef CONFIG_SMP | |
1252 | send_IPI_mask(mask, LOCAL_TIMER_VECTOR); | |
1253 | #else | |
1254 | /* | |
1255 | * We can directly call the apic timer interrupt handler | |
1256 | * in UP case. Minus all irq related functions | |
1257 | */ | |
1258 | up_apic_timer_interrupt_call(regs); | |
1259 | #endif | |
1260 | } | |
1261 | } | |
1262 | ||
5a07a30c VP |
1263 | int setup_profiling_timer(unsigned int multiplier) |
1264 | { | |
1265 | return -EINVAL; | |
1266 | } | |
1267 | ||
1da177e4 LT |
1268 | /* |
1269 | * This interrupt should _never_ happen with our APIC/SMP architecture | |
1270 | */ | |
1271 | fastcall void smp_spurious_interrupt(struct pt_regs *regs) | |
1272 | { | |
1273 | unsigned long v; | |
1274 | ||
1275 | irq_enter(); | |
1276 | /* | |
1277 | * Check if this really is a spurious interrupt and ACK it | |
1278 | * if it is a vectored one. Just in case... | |
1279 | * Spurious interrupts should not be ACKed. | |
1280 | */ | |
1281 | v = apic_read(APIC_ISR + ((SPURIOUS_APIC_VECTOR & ~0x1f) >> 1)); | |
1282 | if (v & (1 << (SPURIOUS_APIC_VECTOR & 0x1f))) | |
1283 | ack_APIC_irq(); | |
1284 | ||
1285 | /* see sw-dev-man vol 3, chapter 7.4.13.5 */ | |
1286 | printk(KERN_INFO "spurious APIC interrupt on CPU#%d, should never happen.\n", | |
1287 | smp_processor_id()); | |
1288 | irq_exit(); | |
1289 | } | |
1290 | ||
1291 | /* | |
1292 | * This interrupt should never happen with our APIC/SMP architecture | |
1293 | */ | |
1294 | ||
1295 | fastcall void smp_error_interrupt(struct pt_regs *regs) | |
1296 | { | |
1297 | unsigned long v, v1; | |
1298 | ||
1299 | irq_enter(); | |
1300 | /* First tickle the hardware, only then report what went on. -- REW */ | |
1301 | v = apic_read(APIC_ESR); | |
1302 | apic_write(APIC_ESR, 0); | |
1303 | v1 = apic_read(APIC_ESR); | |
1304 | ack_APIC_irq(); | |
1305 | atomic_inc(&irq_err_count); | |
1306 | ||
1307 | /* Here is what the APIC error bits mean: | |
1308 | 0: Send CS error | |
1309 | 1: Receive CS error | |
1310 | 2: Send accept error | |
1311 | 3: Receive accept error | |
1312 | 4: Reserved | |
1313 | 5: Send illegal vector | |
1314 | 6: Received illegal vector | |
1315 | 7: Illegal register address | |
1316 | */ | |
1317 | printk (KERN_DEBUG "APIC error on CPU%d: %02lx(%02lx)\n", | |
1318 | smp_processor_id(), v , v1); | |
1319 | irq_exit(); | |
1320 | } | |
1321 | ||
1322 | /* | |
1e4c85f9 LT |
1323 | * This initializes the IO-APIC and APIC hardware if this is |
1324 | * a UP kernel. | |
1da177e4 | 1325 | */ |
1e4c85f9 | 1326 | int __init APIC_init_uniprocessor (void) |
1da177e4 | 1327 | { |
1e4c85f9 LT |
1328 | if (enable_local_apic < 0) |
1329 | clear_bit(X86_FEATURE_APIC, boot_cpu_data.x86_capability); | |
1da177e4 | 1330 | |
1e4c85f9 | 1331 | if (!smp_found_config && !cpu_has_apic) |
1da177e4 LT |
1332 | return -1; |
1333 | ||
1334 | /* | |
1e4c85f9 | 1335 | * Complain if the BIOS pretends there is one. |
1da177e4 LT |
1336 | */ |
1337 | if (!cpu_has_apic && APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) { | |
1338 | printk(KERN_ERR "BIOS bug, local APIC #%d not detected!...\n", | |
1339 | boot_cpu_physical_apicid); | |
3777a959 | 1340 | clear_bit(X86_FEATURE_APIC, boot_cpu_data.x86_capability); |
1da177e4 LT |
1341 | return -1; |
1342 | } | |
1343 | ||
1344 | verify_local_APIC(); | |
1345 | ||
1346 | connect_bsp_APIC(); | |
1347 | ||
1e4c85f9 | 1348 | phys_cpu_present_map = physid_mask_of_physid(boot_cpu_physical_apicid); |
1da177e4 | 1349 | |
1e4c85f9 | 1350 | setup_local_APIC(); |
1da177e4 | 1351 | |
1da177e4 | 1352 | #ifdef CONFIG_X86_IO_APIC |
1e4c85f9 LT |
1353 | if (smp_found_config) |
1354 | if (!skip_ioapic_setup && nr_ioapics) | |
1355 | setup_IO_APIC(); | |
1da177e4 LT |
1356 | #endif |
1357 | setup_boot_APIC_clock(); | |
1e4c85f9 LT |
1358 | |
1359 | return 0; | |
1da177e4 | 1360 | } |