Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Local APIC handling, local APIC timers | |
3 | * | |
8f47e163 | 4 | * (c) 1999, 2000, 2009 Ingo Molnar <mingo@redhat.com> |
1da177e4 LT |
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 | ||
1da177e4 | 17 | #include <linux/kernel_stat.h> |
d1de36f5 | 18 | #include <linux/mc146818rtc.h> |
70a20025 | 19 | #include <linux/acpi_pmtmr.h> |
d1de36f5 IM |
20 | #include <linux/clockchips.h> |
21 | #include <linux/interrupt.h> | |
22 | #include <linux/bootmem.h> | |
23 | #include <linux/ftrace.h> | |
24 | #include <linux/ioport.h> | |
e83a5fdc | 25 | #include <linux/module.h> |
d1de36f5 IM |
26 | #include <linux/sysdev.h> |
27 | #include <linux/delay.h> | |
28 | #include <linux/timex.h> | |
6e1cb38a | 29 | #include <linux/dmar.h> |
d1de36f5 IM |
30 | #include <linux/init.h> |
31 | #include <linux/cpu.h> | |
32 | #include <linux/dmi.h> | |
e423e33e | 33 | #include <linux/nmi.h> |
d1de36f5 IM |
34 | #include <linux/smp.h> |
35 | #include <linux/mm.h> | |
1da177e4 | 36 | |
1da177e4 | 37 | #include <asm/pgalloc.h> |
1da177e4 | 38 | #include <asm/atomic.h> |
1da177e4 | 39 | #include <asm/mpspec.h> |
773763df | 40 | #include <asm/i8253.h> |
d1de36f5 | 41 | #include <asm/i8259.h> |
73dea47f | 42 | #include <asm/proto.h> |
2c8c0e6b | 43 | #include <asm/apic.h> |
d1de36f5 IM |
44 | #include <asm/desc.h> |
45 | #include <asm/hpet.h> | |
46 | #include <asm/idle.h> | |
47 | #include <asm/mtrr.h> | |
2bc13797 | 48 | #include <asm/smp.h> |
be71b855 | 49 | #include <asm/mce.h> |
1da177e4 | 50 | |
ec70de8b | 51 | unsigned int num_processors; |
fdbecd9f | 52 | |
ec70de8b | 53 | unsigned disabled_cpus __cpuinitdata; |
fdbecd9f | 54 | |
ec70de8b BG |
55 | /* Processor that is doing the boot up */ |
56 | unsigned int boot_cpu_physical_apicid = -1U; | |
5af5573e | 57 | |
80e5609c | 58 | /* |
fdbecd9f IM |
59 | * The highest APIC ID seen during enumeration. |
60 | * | |
61 | * This determines the messaging protocol we can use: if all APIC IDs | |
62 | * are in the 0 ... 7 range, then we can use logical addressing which | |
63 | * has some performance advantages (better broadcasting). | |
64 | * | |
65 | * If there's an APIC ID above 8, we use physical addressing. | |
80e5609c | 66 | */ |
ec70de8b | 67 | unsigned int max_physical_apicid; |
5af5573e | 68 | |
80e5609c | 69 | /* |
fdbecd9f | 70 | * Bitmask of physically existing CPUs: |
80e5609c | 71 | */ |
ec70de8b BG |
72 | physid_mask_t phys_cpu_present_map; |
73 | ||
74 | /* | |
75 | * Map cpu index to physical APIC ID | |
76 | */ | |
77 | DEFINE_EARLY_PER_CPU(u16, x86_cpu_to_apicid, BAD_APICID); | |
78 | DEFINE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid, BAD_APICID); | |
79 | EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid); | |
80 | EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid); | |
80e5609c | 81 | |
b3c51170 YL |
82 | #ifdef CONFIG_X86_32 |
83 | /* | |
84 | * Knob to control our willingness to enable the local APIC. | |
85 | * | |
86 | * +1=force-enable | |
87 | */ | |
88 | static int force_enable_local_apic; | |
89 | /* | |
90 | * APIC command line parameters | |
91 | */ | |
92 | static int __init parse_lapic(char *arg) | |
93 | { | |
94 | force_enable_local_apic = 1; | |
95 | return 0; | |
96 | } | |
97 | early_param("lapic", parse_lapic); | |
f28c0ae2 YL |
98 | /* Local APIC was disabled by the BIOS and enabled by the kernel */ |
99 | static int enabled_via_apicbase; | |
100 | ||
c0eaa453 CG |
101 | /* |
102 | * Handle interrupt mode configuration register (IMCR). | |
103 | * This register controls whether the interrupt signals | |
104 | * that reach the BSP come from the master PIC or from the | |
105 | * local APIC. Before entering Symmetric I/O Mode, either | |
106 | * the BIOS or the operating system must switch out of | |
107 | * PIC Mode by changing the IMCR. | |
108 | */ | |
5cda395f | 109 | static inline void imcr_pic_to_apic(void) |
c0eaa453 CG |
110 | { |
111 | /* select IMCR register */ | |
112 | outb(0x70, 0x22); | |
113 | /* NMI and 8259 INTR go through APIC */ | |
114 | outb(0x01, 0x23); | |
115 | } | |
116 | ||
5cda395f | 117 | static inline void imcr_apic_to_pic(void) |
c0eaa453 CG |
118 | { |
119 | /* select IMCR register */ | |
120 | outb(0x70, 0x22); | |
121 | /* NMI and 8259 INTR go directly to BSP */ | |
122 | outb(0x00, 0x23); | |
123 | } | |
b3c51170 YL |
124 | #endif |
125 | ||
126 | #ifdef CONFIG_X86_64 | |
bc1d99c1 | 127 | static int apic_calibrate_pmtmr __initdata; |
b3c51170 YL |
128 | static __init int setup_apicpmtimer(char *s) |
129 | { | |
130 | apic_calibrate_pmtmr = 1; | |
131 | notsc_setup(NULL); | |
132 | return 0; | |
133 | } | |
134 | __setup("apicpmtimer", setup_apicpmtimer); | |
135 | #endif | |
136 | ||
06cd9a7d | 137 | #ifdef CONFIG_X86_X2APIC |
89027d35 | 138 | int x2apic; |
6e1cb38a | 139 | /* x2apic enabled before OS handover */ |
b6b301aa JS |
140 | static int x2apic_preenabled; |
141 | static int disable_x2apic; | |
49899eac YL |
142 | static __init int setup_nox2apic(char *str) |
143 | { | |
144 | disable_x2apic = 1; | |
145 | setup_clear_cpu_cap(X86_FEATURE_X2APIC); | |
146 | return 0; | |
147 | } | |
148 | early_param("nox2apic", setup_nox2apic); | |
149 | #endif | |
1da177e4 | 150 | |
b3c51170 YL |
151 | unsigned long mp_lapic_addr; |
152 | int disable_apic; | |
153 | /* Disable local APIC timer from the kernel commandline or via dmi quirk */ | |
154 | static int disable_apic_timer __cpuinitdata; | |
e83a5fdc | 155 | /* Local APIC timer works in C2 */ |
2e7c2838 LT |
156 | int local_apic_timer_c2_ok; |
157 | EXPORT_SYMBOL_GPL(local_apic_timer_c2_ok); | |
158 | ||
efa2559f YL |
159 | int first_system_vector = 0xfe; |
160 | ||
e83a5fdc HS |
161 | /* |
162 | * Debug level, exported for io_apic.c | |
163 | */ | |
baa13188 | 164 | unsigned int apic_verbosity; |
e83a5fdc | 165 | |
89c38c28 CG |
166 | int pic_mode; |
167 | ||
bab4b27c AS |
168 | /* Have we found an MP table */ |
169 | int smp_found_config; | |
170 | ||
39928722 AD |
171 | static struct resource lapic_resource = { |
172 | .name = "Local APIC", | |
173 | .flags = IORESOURCE_MEM | IORESOURCE_BUSY, | |
174 | }; | |
175 | ||
d03030e9 TG |
176 | static unsigned int calibration_result; |
177 | ||
ba7eda4c TG |
178 | static int lapic_next_event(unsigned long delta, |
179 | struct clock_event_device *evt); | |
180 | static void lapic_timer_setup(enum clock_event_mode mode, | |
181 | struct clock_event_device *evt); | |
9628937d | 182 | static void lapic_timer_broadcast(const struct cpumask *mask); |
0e078e2f | 183 | static void apic_pm_activate(void); |
ba7eda4c | 184 | |
274cfe59 CG |
185 | /* |
186 | * The local apic timer can be used for any function which is CPU local. | |
187 | */ | |
ba7eda4c TG |
188 | static struct clock_event_device lapic_clockevent = { |
189 | .name = "lapic", | |
190 | .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT | |
191 | | CLOCK_EVT_FEAT_C3STOP | CLOCK_EVT_FEAT_DUMMY, | |
192 | .shift = 32, | |
193 | .set_mode = lapic_timer_setup, | |
194 | .set_next_event = lapic_next_event, | |
195 | .broadcast = lapic_timer_broadcast, | |
196 | .rating = 100, | |
197 | .irq = -1, | |
198 | }; | |
199 | static DEFINE_PER_CPU(struct clock_event_device, lapic_events); | |
200 | ||
d3432896 AK |
201 | static unsigned long apic_phys; |
202 | ||
0e078e2f TG |
203 | /* |
204 | * Get the LAPIC version | |
205 | */ | |
206 | static inline int lapic_get_version(void) | |
ba7eda4c | 207 | { |
0e078e2f | 208 | return GET_APIC_VERSION(apic_read(APIC_LVR)); |
ba7eda4c TG |
209 | } |
210 | ||
0e078e2f | 211 | /* |
9c803869 | 212 | * Check, if the APIC is integrated or a separate chip |
0e078e2f TG |
213 | */ |
214 | static inline int lapic_is_integrated(void) | |
ba7eda4c | 215 | { |
9c803869 | 216 | #ifdef CONFIG_X86_64 |
0e078e2f | 217 | return 1; |
9c803869 CG |
218 | #else |
219 | return APIC_INTEGRATED(lapic_get_version()); | |
220 | #endif | |
ba7eda4c TG |
221 | } |
222 | ||
223 | /* | |
0e078e2f | 224 | * Check, whether this is a modern or a first generation APIC |
ba7eda4c | 225 | */ |
0e078e2f | 226 | static int modern_apic(void) |
ba7eda4c | 227 | { |
0e078e2f TG |
228 | /* AMD systems use old APIC versions, so check the CPU */ |
229 | if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD && | |
230 | boot_cpu_data.x86 >= 0xf) | |
231 | return 1; | |
232 | return lapic_get_version() >= 0x14; | |
ba7eda4c TG |
233 | } |
234 | ||
08306ce6 CG |
235 | /* |
236 | * bare function to substitute write operation | |
237 | * and it's _that_ fast :) | |
238 | */ | |
239 | void native_apic_write_dummy(u32 reg, u32 v) | |
240 | { | |
241 | WARN_ON_ONCE((cpu_has_apic || !disable_apic)); | |
242 | } | |
243 | ||
244 | /* | |
245 | * right after this call apic->write doesn't do anything | |
246 | * note that there is no restore operation it works one way | |
247 | */ | |
248 | void apic_disable(void) | |
249 | { | |
250 | apic->write = native_apic_write_dummy; | |
251 | } | |
252 | ||
c1eeb2de | 253 | void native_apic_wait_icr_idle(void) |
8339e9fb FLV |
254 | { |
255 | while (apic_read(APIC_ICR) & APIC_ICR_BUSY) | |
256 | cpu_relax(); | |
257 | } | |
258 | ||
c1eeb2de | 259 | u32 native_safe_apic_wait_icr_idle(void) |
8339e9fb | 260 | { |
3c6bb07a | 261 | u32 send_status; |
8339e9fb FLV |
262 | int timeout; |
263 | ||
264 | timeout = 0; | |
265 | do { | |
266 | send_status = apic_read(APIC_ICR) & APIC_ICR_BUSY; | |
267 | if (!send_status) | |
268 | break; | |
269 | udelay(100); | |
270 | } while (timeout++ < 1000); | |
271 | ||
272 | return send_status; | |
273 | } | |
274 | ||
c1eeb2de | 275 | void native_apic_icr_write(u32 low, u32 id) |
1b374e4d | 276 | { |
ed4e5ec1 | 277 | apic_write(APIC_ICR2, SET_APIC_DEST_FIELD(id)); |
1b374e4d SS |
278 | apic_write(APIC_ICR, low); |
279 | } | |
280 | ||
c1eeb2de | 281 | u64 native_apic_icr_read(void) |
1b374e4d SS |
282 | { |
283 | u32 icr1, icr2; | |
284 | ||
285 | icr2 = apic_read(APIC_ICR2); | |
286 | icr1 = apic_read(APIC_ICR); | |
287 | ||
cf9768d7 | 288 | return icr1 | ((u64)icr2 << 32); |
1b374e4d SS |
289 | } |
290 | ||
0e078e2f TG |
291 | /** |
292 | * enable_NMI_through_LVT0 - enable NMI through local vector table 0 | |
293 | */ | |
e9427101 | 294 | void __cpuinit enable_NMI_through_LVT0(void) |
1da177e4 | 295 | { |
11a8e778 | 296 | unsigned int v; |
6935d1f9 TG |
297 | |
298 | /* unmask and set to NMI */ | |
299 | v = APIC_DM_NMI; | |
d4c63ec0 CG |
300 | |
301 | /* Level triggered for 82489DX (32bit mode) */ | |
302 | if (!lapic_is_integrated()) | |
303 | v |= APIC_LVT_LEVEL_TRIGGER; | |
304 | ||
11a8e778 | 305 | apic_write(APIC_LVT0, v); |
1da177e4 LT |
306 | } |
307 | ||
7c37e48b CG |
308 | #ifdef CONFIG_X86_32 |
309 | /** | |
310 | * get_physical_broadcast - Get number of physical broadcast IDs | |
311 | */ | |
312 | int get_physical_broadcast(void) | |
313 | { | |
314 | return modern_apic() ? 0xff : 0xf; | |
315 | } | |
316 | #endif | |
317 | ||
0e078e2f TG |
318 | /** |
319 | * lapic_get_maxlvt - get the maximum number of local vector table entries | |
320 | */ | |
37e650c7 | 321 | int lapic_get_maxlvt(void) |
1da177e4 | 322 | { |
36a028de | 323 | unsigned int v; |
1da177e4 LT |
324 | |
325 | v = apic_read(APIC_LVR); | |
36a028de CG |
326 | /* |
327 | * - we always have APIC integrated on 64bit mode | |
328 | * - 82489DXs do not report # of LVT entries | |
329 | */ | |
330 | return APIC_INTEGRATED(GET_APIC_VERSION(v)) ? GET_APIC_MAXLVT(v) : 2; | |
1da177e4 LT |
331 | } |
332 | ||
274cfe59 CG |
333 | /* |
334 | * Local APIC timer | |
335 | */ | |
336 | ||
c40aaec6 | 337 | /* Clock divisor */ |
c40aaec6 | 338 | #define APIC_DIVISOR 16 |
f07f4f90 | 339 | |
0e078e2f TG |
340 | /* |
341 | * This function sets up the local APIC timer, with a timeout of | |
342 | * 'clocks' APIC bus clock. During calibration we actually call | |
343 | * this function twice on the boot CPU, once with a bogus timeout | |
344 | * value, second time for real. The other (noncalibrating) CPUs | |
345 | * call this function only once, with the real, calibrated value. | |
346 | * | |
347 | * We do reads before writes even if unnecessary, to get around the | |
348 | * P5 APIC double write bug. | |
349 | */ | |
0e078e2f | 350 | static void __setup_APIC_LVTT(unsigned int clocks, int oneshot, int irqen) |
1da177e4 | 351 | { |
0e078e2f | 352 | unsigned int lvtt_value, tmp_value; |
1da177e4 | 353 | |
0e078e2f TG |
354 | lvtt_value = LOCAL_TIMER_VECTOR; |
355 | if (!oneshot) | |
356 | lvtt_value |= APIC_LVT_TIMER_PERIODIC; | |
f07f4f90 CG |
357 | if (!lapic_is_integrated()) |
358 | lvtt_value |= SET_APIC_TIMER_BASE(APIC_TIMER_BASE_DIV); | |
359 | ||
0e078e2f TG |
360 | if (!irqen) |
361 | lvtt_value |= APIC_LVT_MASKED; | |
1da177e4 | 362 | |
0e078e2f | 363 | apic_write(APIC_LVTT, lvtt_value); |
1da177e4 LT |
364 | |
365 | /* | |
0e078e2f | 366 | * Divide PICLK by 16 |
1da177e4 | 367 | */ |
0e078e2f | 368 | tmp_value = apic_read(APIC_TDCR); |
c40aaec6 CG |
369 | apic_write(APIC_TDCR, |
370 | (tmp_value & ~(APIC_TDR_DIV_1 | APIC_TDR_DIV_TMBASE)) | | |
371 | APIC_TDR_DIV_16); | |
0e078e2f TG |
372 | |
373 | if (!oneshot) | |
f07f4f90 | 374 | apic_write(APIC_TMICT, clocks / APIC_DIVISOR); |
1da177e4 LT |
375 | } |
376 | ||
0e078e2f | 377 | /* |
7b83dae7 RR |
378 | * Setup extended LVT, AMD specific (K8, family 10h) |
379 | * | |
380 | * Vector mappings are hard coded. On K8 only offset 0 (APIC500) and | |
381 | * MCE interrupts are supported. Thus MCE offset must be set to 0. | |
286f5718 RR |
382 | * |
383 | * If mask=1, the LVT entry does not generate interrupts while mask=0 | |
384 | * enables the vector. See also the BKDGs. | |
0e078e2f | 385 | */ |
7b83dae7 RR |
386 | |
387 | #define APIC_EILVT_LVTOFF_MCE 0 | |
388 | #define APIC_EILVT_LVTOFF_IBS 1 | |
389 | ||
390 | static void setup_APIC_eilvt(u8 lvt_off, u8 vector, u8 msg_type, u8 mask) | |
1da177e4 | 391 | { |
7b83dae7 | 392 | unsigned long reg = (lvt_off << 4) + APIC_EILVT0; |
0e078e2f | 393 | unsigned int v = (mask << 16) | (msg_type << 8) | vector; |
a8fcf1a2 | 394 | |
0e078e2f | 395 | apic_write(reg, v); |
1da177e4 LT |
396 | } |
397 | ||
7b83dae7 RR |
398 | u8 setup_APIC_eilvt_mce(u8 vector, u8 msg_type, u8 mask) |
399 | { | |
400 | setup_APIC_eilvt(APIC_EILVT_LVTOFF_MCE, vector, msg_type, mask); | |
401 | return APIC_EILVT_LVTOFF_MCE; | |
402 | } | |
403 | ||
404 | u8 setup_APIC_eilvt_ibs(u8 vector, u8 msg_type, u8 mask) | |
405 | { | |
406 | setup_APIC_eilvt(APIC_EILVT_LVTOFF_IBS, vector, msg_type, mask); | |
407 | return APIC_EILVT_LVTOFF_IBS; | |
408 | } | |
6aa360e6 | 409 | EXPORT_SYMBOL_GPL(setup_APIC_eilvt_ibs); |
7b83dae7 | 410 | |
0e078e2f TG |
411 | /* |
412 | * Program the next event, relative to now | |
413 | */ | |
414 | static int lapic_next_event(unsigned long delta, | |
415 | struct clock_event_device *evt) | |
1da177e4 | 416 | { |
0e078e2f TG |
417 | apic_write(APIC_TMICT, delta); |
418 | return 0; | |
1da177e4 LT |
419 | } |
420 | ||
0e078e2f TG |
421 | /* |
422 | * Setup the lapic timer in periodic or oneshot mode | |
423 | */ | |
424 | static void lapic_timer_setup(enum clock_event_mode mode, | |
425 | struct clock_event_device *evt) | |
9b7711f0 HS |
426 | { |
427 | unsigned long flags; | |
0e078e2f | 428 | unsigned int v; |
9b7711f0 | 429 | |
0e078e2f TG |
430 | /* Lapic used as dummy for broadcast ? */ |
431 | if (evt->features & CLOCK_EVT_FEAT_DUMMY) | |
9b7711f0 HS |
432 | return; |
433 | ||
434 | local_irq_save(flags); | |
435 | ||
0e078e2f TG |
436 | switch (mode) { |
437 | case CLOCK_EVT_MODE_PERIODIC: | |
438 | case CLOCK_EVT_MODE_ONESHOT: | |
439 | __setup_APIC_LVTT(calibration_result, | |
440 | mode != CLOCK_EVT_MODE_PERIODIC, 1); | |
441 | break; | |
442 | case CLOCK_EVT_MODE_UNUSED: | |
443 | case CLOCK_EVT_MODE_SHUTDOWN: | |
444 | v = apic_read(APIC_LVTT); | |
445 | v |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR); | |
446 | apic_write(APIC_LVTT, v); | |
a98f8fd2 | 447 | apic_write(APIC_TMICT, 0xffffffff); |
0e078e2f TG |
448 | break; |
449 | case CLOCK_EVT_MODE_RESUME: | |
450 | /* Nothing to do here */ | |
451 | break; | |
452 | } | |
9b7711f0 HS |
453 | |
454 | local_irq_restore(flags); | |
455 | } | |
456 | ||
1da177e4 | 457 | /* |
0e078e2f | 458 | * Local APIC timer broadcast function |
1da177e4 | 459 | */ |
9628937d | 460 | static void lapic_timer_broadcast(const struct cpumask *mask) |
1da177e4 | 461 | { |
0e078e2f | 462 | #ifdef CONFIG_SMP |
dac5f412 | 463 | apic->send_IPI_mask(mask, LOCAL_TIMER_VECTOR); |
0e078e2f TG |
464 | #endif |
465 | } | |
1da177e4 | 466 | |
0e078e2f TG |
467 | /* |
468 | * Setup the local APIC timer for this CPU. Copy the initilized values | |
469 | * of the boot CPU and register the clock event in the framework. | |
470 | */ | |
db4b5525 | 471 | static void __cpuinit setup_APIC_timer(void) |
0e078e2f TG |
472 | { |
473 | struct clock_event_device *levt = &__get_cpu_var(lapic_events); | |
1da177e4 | 474 | |
db954b58 VP |
475 | if (cpu_has(¤t_cpu_data, X86_FEATURE_ARAT)) { |
476 | lapic_clockevent.features &= ~CLOCK_EVT_FEAT_C3STOP; | |
477 | /* Make LAPIC timer preferrable over percpu HPET */ | |
478 | lapic_clockevent.rating = 150; | |
479 | } | |
480 | ||
0e078e2f | 481 | memcpy(levt, &lapic_clockevent, sizeof(*levt)); |
320ab2b0 | 482 | levt->cpumask = cpumask_of(smp_processor_id()); |
1da177e4 | 483 | |
0e078e2f TG |
484 | clockevents_register_device(levt); |
485 | } | |
1da177e4 | 486 | |
2f04fa88 YL |
487 | /* |
488 | * In this functions we calibrate APIC bus clocks to the external timer. | |
489 | * | |
490 | * We want to do the calibration only once since we want to have local timer | |
491 | * irqs syncron. CPUs connected by the same APIC bus have the very same bus | |
492 | * frequency. | |
493 | * | |
494 | * This was previously done by reading the PIT/HPET and waiting for a wrap | |
495 | * around to find out, that a tick has elapsed. I have a box, where the PIT | |
496 | * readout is broken, so it never gets out of the wait loop again. This was | |
497 | * also reported by others. | |
498 | * | |
499 | * Monitoring the jiffies value is inaccurate and the clockevents | |
500 | * infrastructure allows us to do a simple substitution of the interrupt | |
501 | * handler. | |
502 | * | |
503 | * The calibration routine also uses the pm_timer when possible, as the PIT | |
504 | * happens to run way too slow (factor 2.3 on my VAIO CoreDuo, which goes | |
505 | * back to normal later in the boot process). | |
506 | */ | |
507 | ||
508 | #define LAPIC_CAL_LOOPS (HZ/10) | |
509 | ||
510 | static __initdata int lapic_cal_loops = -1; | |
511 | static __initdata long lapic_cal_t1, lapic_cal_t2; | |
512 | static __initdata unsigned long long lapic_cal_tsc1, lapic_cal_tsc2; | |
513 | static __initdata unsigned long lapic_cal_pm1, lapic_cal_pm2; | |
514 | static __initdata unsigned long lapic_cal_j1, lapic_cal_j2; | |
515 | ||
516 | /* | |
517 | * Temporary interrupt handler. | |
518 | */ | |
519 | static void __init lapic_cal_handler(struct clock_event_device *dev) | |
520 | { | |
521 | unsigned long long tsc = 0; | |
522 | long tapic = apic_read(APIC_TMCCT); | |
523 | unsigned long pm = acpi_pm_read_early(); | |
524 | ||
525 | if (cpu_has_tsc) | |
526 | rdtscll(tsc); | |
527 | ||
528 | switch (lapic_cal_loops++) { | |
529 | case 0: | |
530 | lapic_cal_t1 = tapic; | |
531 | lapic_cal_tsc1 = tsc; | |
532 | lapic_cal_pm1 = pm; | |
533 | lapic_cal_j1 = jiffies; | |
534 | break; | |
535 | ||
536 | case LAPIC_CAL_LOOPS: | |
537 | lapic_cal_t2 = tapic; | |
538 | lapic_cal_tsc2 = tsc; | |
539 | if (pm < lapic_cal_pm1) | |
540 | pm += ACPI_PM_OVRRUN; | |
541 | lapic_cal_pm2 = pm; | |
542 | lapic_cal_j2 = jiffies; | |
543 | break; | |
544 | } | |
545 | } | |
546 | ||
754ef0cd YI |
547 | static int __init |
548 | calibrate_by_pmtimer(long deltapm, long *delta, long *deltatsc) | |
b189892d CG |
549 | { |
550 | const long pm_100ms = PMTMR_TICKS_PER_SEC / 10; | |
551 | const long pm_thresh = pm_100ms / 100; | |
552 | unsigned long mult; | |
553 | u64 res; | |
554 | ||
555 | #ifndef CONFIG_X86_PM_TIMER | |
556 | return -1; | |
557 | #endif | |
558 | ||
39ba5d43 | 559 | apic_printk(APIC_VERBOSE, "... PM-Timer delta = %ld\n", deltapm); |
b189892d CG |
560 | |
561 | /* Check, if the PM timer is available */ | |
562 | if (!deltapm) | |
563 | return -1; | |
564 | ||
565 | mult = clocksource_hz2mult(PMTMR_TICKS_PER_SEC, 22); | |
566 | ||
567 | if (deltapm > (pm_100ms - pm_thresh) && | |
568 | deltapm < (pm_100ms + pm_thresh)) { | |
39ba5d43 | 569 | apic_printk(APIC_VERBOSE, "... PM-Timer result ok\n"); |
754ef0cd YI |
570 | return 0; |
571 | } | |
572 | ||
573 | res = (((u64)deltapm) * mult) >> 22; | |
574 | do_div(res, 1000000); | |
575 | pr_warning("APIC calibration not consistent " | |
39ba5d43 | 576 | "with PM-Timer: %ldms instead of 100ms\n",(long)res); |
754ef0cd YI |
577 | |
578 | /* Correct the lapic counter value */ | |
579 | res = (((u64)(*delta)) * pm_100ms); | |
580 | do_div(res, deltapm); | |
581 | pr_info("APIC delta adjusted to PM-Timer: " | |
582 | "%lu (%ld)\n", (unsigned long)res, *delta); | |
583 | *delta = (long)res; | |
584 | ||
585 | /* Correct the tsc counter value */ | |
586 | if (cpu_has_tsc) { | |
587 | res = (((u64)(*deltatsc)) * pm_100ms); | |
b189892d | 588 | do_div(res, deltapm); |
754ef0cd YI |
589 | apic_printk(APIC_VERBOSE, "TSC delta adjusted to " |
590 | "PM-Timer: %lu (%ld) \n", | |
591 | (unsigned long)res, *deltatsc); | |
592 | *deltatsc = (long)res; | |
b189892d CG |
593 | } |
594 | ||
595 | return 0; | |
596 | } | |
597 | ||
2f04fa88 YL |
598 | static int __init calibrate_APIC_clock(void) |
599 | { | |
600 | struct clock_event_device *levt = &__get_cpu_var(lapic_events); | |
2f04fa88 YL |
601 | void (*real_handler)(struct clock_event_device *dev); |
602 | unsigned long deltaj; | |
754ef0cd | 603 | long delta, deltatsc; |
2f04fa88 YL |
604 | int pm_referenced = 0; |
605 | ||
606 | local_irq_disable(); | |
607 | ||
608 | /* Replace the global interrupt handler */ | |
609 | real_handler = global_clock_event->event_handler; | |
610 | global_clock_event->event_handler = lapic_cal_handler; | |
611 | ||
612 | /* | |
81608f3c | 613 | * Setup the APIC counter to maximum. There is no way the lapic |
2f04fa88 YL |
614 | * can underflow in the 100ms detection time frame |
615 | */ | |
81608f3c | 616 | __setup_APIC_LVTT(0xffffffff, 0, 0); |
2f04fa88 YL |
617 | |
618 | /* Let the interrupts run */ | |
619 | local_irq_enable(); | |
620 | ||
621 | while (lapic_cal_loops <= LAPIC_CAL_LOOPS) | |
622 | cpu_relax(); | |
623 | ||
624 | local_irq_disable(); | |
625 | ||
626 | /* Restore the real event handler */ | |
627 | global_clock_event->event_handler = real_handler; | |
628 | ||
629 | /* Build delta t1-t2 as apic timer counts down */ | |
630 | delta = lapic_cal_t1 - lapic_cal_t2; | |
631 | apic_printk(APIC_VERBOSE, "... lapic delta = %ld\n", delta); | |
632 | ||
754ef0cd YI |
633 | deltatsc = (long)(lapic_cal_tsc2 - lapic_cal_tsc1); |
634 | ||
b189892d CG |
635 | /* we trust the PM based calibration if possible */ |
636 | pm_referenced = !calibrate_by_pmtimer(lapic_cal_pm2 - lapic_cal_pm1, | |
754ef0cd | 637 | &delta, &deltatsc); |
2f04fa88 YL |
638 | |
639 | /* Calculate the scaled math multiplication factor */ | |
640 | lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS, | |
641 | lapic_clockevent.shift); | |
642 | lapic_clockevent.max_delta_ns = | |
643 | clockevent_delta2ns(0x7FFFFF, &lapic_clockevent); | |
644 | lapic_clockevent.min_delta_ns = | |
645 | clockevent_delta2ns(0xF, &lapic_clockevent); | |
646 | ||
647 | calibration_result = (delta * APIC_DIVISOR) / LAPIC_CAL_LOOPS; | |
648 | ||
649 | apic_printk(APIC_VERBOSE, "..... delta %ld\n", delta); | |
650 | apic_printk(APIC_VERBOSE, "..... mult: %ld\n", lapic_clockevent.mult); | |
651 | apic_printk(APIC_VERBOSE, "..... calibration result: %u\n", | |
652 | calibration_result); | |
653 | ||
654 | if (cpu_has_tsc) { | |
2f04fa88 YL |
655 | apic_printk(APIC_VERBOSE, "..... CPU clock speed is " |
656 | "%ld.%04ld MHz.\n", | |
754ef0cd YI |
657 | (deltatsc / LAPIC_CAL_LOOPS) / (1000000 / HZ), |
658 | (deltatsc / LAPIC_CAL_LOOPS) % (1000000 / HZ)); | |
2f04fa88 YL |
659 | } |
660 | ||
661 | apic_printk(APIC_VERBOSE, "..... host bus clock speed is " | |
662 | "%u.%04u MHz.\n", | |
663 | calibration_result / (1000000 / HZ), | |
664 | calibration_result % (1000000 / HZ)); | |
665 | ||
666 | /* | |
667 | * Do a sanity check on the APIC calibration result | |
668 | */ | |
669 | if (calibration_result < (1000000 / HZ)) { | |
670 | local_irq_enable(); | |
ba21ebb6 | 671 | pr_warning("APIC frequency too slow, disabling apic timer\n"); |
2f04fa88 YL |
672 | return -1; |
673 | } | |
674 | ||
675 | levt->features &= ~CLOCK_EVT_FEAT_DUMMY; | |
676 | ||
b189892d CG |
677 | /* |
678 | * PM timer calibration failed or not turned on | |
679 | * so lets try APIC timer based calibration | |
680 | */ | |
2f04fa88 YL |
681 | if (!pm_referenced) { |
682 | apic_printk(APIC_VERBOSE, "... verify APIC timer\n"); | |
683 | ||
684 | /* | |
685 | * Setup the apic timer manually | |
686 | */ | |
687 | levt->event_handler = lapic_cal_handler; | |
688 | lapic_timer_setup(CLOCK_EVT_MODE_PERIODIC, levt); | |
689 | lapic_cal_loops = -1; | |
690 | ||
691 | /* Let the interrupts run */ | |
692 | local_irq_enable(); | |
693 | ||
694 | while (lapic_cal_loops <= LAPIC_CAL_LOOPS) | |
695 | cpu_relax(); | |
696 | ||
2f04fa88 YL |
697 | /* Stop the lapic timer */ |
698 | lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, levt); | |
699 | ||
2f04fa88 YL |
700 | /* Jiffies delta */ |
701 | deltaj = lapic_cal_j2 - lapic_cal_j1; | |
702 | apic_printk(APIC_VERBOSE, "... jiffies delta = %lu\n", deltaj); | |
703 | ||
704 | /* Check, if the jiffies result is consistent */ | |
705 | if (deltaj >= LAPIC_CAL_LOOPS-2 && deltaj <= LAPIC_CAL_LOOPS+2) | |
706 | apic_printk(APIC_VERBOSE, "... jiffies result ok\n"); | |
707 | else | |
708 | levt->features |= CLOCK_EVT_FEAT_DUMMY; | |
709 | } else | |
710 | local_irq_enable(); | |
711 | ||
712 | if (levt->features & CLOCK_EVT_FEAT_DUMMY) { | |
e423e33e | 713 | pr_warning("APIC timer disabled due to verification failure\n"); |
2f04fa88 YL |
714 | return -1; |
715 | } | |
716 | ||
717 | return 0; | |
718 | } | |
719 | ||
e83a5fdc HS |
720 | /* |
721 | * Setup the boot APIC | |
722 | * | |
723 | * Calibrate and verify the result. | |
724 | */ | |
0e078e2f TG |
725 | void __init setup_boot_APIC_clock(void) |
726 | { | |
727 | /* | |
274cfe59 CG |
728 | * The local apic timer can be disabled via the kernel |
729 | * commandline or from the CPU detection code. Register the lapic | |
730 | * timer as a dummy clock event source on SMP systems, so the | |
731 | * broadcast mechanism is used. On UP systems simply ignore it. | |
0e078e2f TG |
732 | */ |
733 | if (disable_apic_timer) { | |
ba21ebb6 | 734 | pr_info("Disabling APIC timer\n"); |
0e078e2f | 735 | /* No broadcast on UP ! */ |
9d09951d TG |
736 | if (num_possible_cpus() > 1) { |
737 | lapic_clockevent.mult = 1; | |
0e078e2f | 738 | setup_APIC_timer(); |
9d09951d | 739 | } |
0e078e2f TG |
740 | return; |
741 | } | |
742 | ||
274cfe59 CG |
743 | apic_printk(APIC_VERBOSE, "Using local APIC timer interrupts.\n" |
744 | "calibrating APIC timer ...\n"); | |
745 | ||
89b3b1f4 | 746 | if (calibrate_APIC_clock()) { |
c2b84b30 TG |
747 | /* No broadcast on UP ! */ |
748 | if (num_possible_cpus() > 1) | |
749 | setup_APIC_timer(); | |
750 | return; | |
751 | } | |
752 | ||
0e078e2f TG |
753 | /* |
754 | * If nmi_watchdog is set to IO_APIC, we need the | |
755 | * PIT/HPET going. Otherwise register lapic as a dummy | |
756 | * device. | |
757 | */ | |
758 | if (nmi_watchdog != NMI_IO_APIC) | |
759 | lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY; | |
760 | else | |
ba21ebb6 | 761 | pr_warning("APIC timer registered as dummy," |
116f570e | 762 | " due to nmi_watchdog=%d!\n", nmi_watchdog); |
0e078e2f | 763 | |
274cfe59 | 764 | /* Setup the lapic or request the broadcast */ |
0e078e2f TG |
765 | setup_APIC_timer(); |
766 | } | |
767 | ||
0e078e2f TG |
768 | void __cpuinit setup_secondary_APIC_clock(void) |
769 | { | |
0e078e2f TG |
770 | setup_APIC_timer(); |
771 | } | |
772 | ||
773 | /* | |
774 | * The guts of the apic timer interrupt | |
775 | */ | |
776 | static void local_apic_timer_interrupt(void) | |
777 | { | |
778 | int cpu = smp_processor_id(); | |
779 | struct clock_event_device *evt = &per_cpu(lapic_events, cpu); | |
780 | ||
781 | /* | |
782 | * Normally we should not be here till LAPIC has been initialized but | |
783 | * in some cases like kdump, its possible that there is a pending LAPIC | |
784 | * timer interrupt from previous kernel's context and is delivered in | |
785 | * new kernel the moment interrupts are enabled. | |
786 | * | |
787 | * Interrupts are enabled early and LAPIC is setup much later, hence | |
788 | * its possible that when we get here evt->event_handler is NULL. | |
789 | * Check for event_handler being NULL and discard the interrupt as | |
790 | * spurious. | |
791 | */ | |
792 | if (!evt->event_handler) { | |
ba21ebb6 | 793 | pr_warning("Spurious LAPIC timer interrupt on cpu %d\n", cpu); |
0e078e2f TG |
794 | /* Switch it off */ |
795 | lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, evt); | |
796 | return; | |
797 | } | |
798 | ||
799 | /* | |
800 | * the NMI deadlock-detector uses this. | |
801 | */ | |
915b0d01 | 802 | inc_irq_stat(apic_timer_irqs); |
0e078e2f TG |
803 | |
804 | evt->event_handler(evt); | |
805 | } | |
806 | ||
807 | /* | |
808 | * Local APIC timer interrupt. This is the most natural way for doing | |
809 | * local interrupts, but local timer interrupts can be emulated by | |
810 | * broadcast interrupts too. [in case the hw doesn't support APIC timers] | |
811 | * | |
812 | * [ if a single-CPU system runs an SMP kernel then we call the local | |
813 | * interrupt as well. Thus we cannot inline the local irq ... ] | |
814 | */ | |
bcbc4f20 | 815 | void __irq_entry smp_apic_timer_interrupt(struct pt_regs *regs) |
0e078e2f TG |
816 | { |
817 | struct pt_regs *old_regs = set_irq_regs(regs); | |
818 | ||
819 | /* | |
820 | * NOTE! We'd better ACK the irq immediately, | |
821 | * because timer handling can be slow. | |
822 | */ | |
823 | ack_APIC_irq(); | |
824 | /* | |
825 | * update_process_times() expects us to have done irq_enter(). | |
826 | * Besides, if we don't timer interrupts ignore the global | |
827 | * interrupt lock, which is the WrongThing (tm) to do. | |
828 | */ | |
829 | exit_idle(); | |
830 | irq_enter(); | |
831 | local_apic_timer_interrupt(); | |
832 | irq_exit(); | |
274cfe59 | 833 | |
0e078e2f TG |
834 | set_irq_regs(old_regs); |
835 | } | |
836 | ||
837 | int setup_profiling_timer(unsigned int multiplier) | |
838 | { | |
839 | return -EINVAL; | |
840 | } | |
841 | ||
0e078e2f TG |
842 | /* |
843 | * Local APIC start and shutdown | |
844 | */ | |
845 | ||
846 | /** | |
847 | * clear_local_APIC - shutdown the local APIC | |
848 | * | |
849 | * This is called, when a CPU is disabled and before rebooting, so the state of | |
850 | * the local APIC has no dangling leftovers. Also used to cleanout any BIOS | |
851 | * leftovers during boot. | |
852 | */ | |
853 | void clear_local_APIC(void) | |
854 | { | |
2584a82d | 855 | int maxlvt; |
0e078e2f TG |
856 | u32 v; |
857 | ||
d3432896 | 858 | /* APIC hasn't been mapped yet */ |
cf6567fe | 859 | if (!x2apic && !apic_phys) |
d3432896 AK |
860 | return; |
861 | ||
862 | maxlvt = lapic_get_maxlvt(); | |
0e078e2f TG |
863 | /* |
864 | * Masking an LVT entry can trigger a local APIC error | |
865 | * if the vector is zero. Mask LVTERR first to prevent this. | |
866 | */ | |
867 | if (maxlvt >= 3) { | |
868 | v = ERROR_APIC_VECTOR; /* any non-zero vector will do */ | |
869 | apic_write(APIC_LVTERR, v | APIC_LVT_MASKED); | |
870 | } | |
871 | /* | |
872 | * Careful: we have to set masks only first to deassert | |
873 | * any level-triggered sources. | |
874 | */ | |
875 | v = apic_read(APIC_LVTT); | |
876 | apic_write(APIC_LVTT, v | APIC_LVT_MASKED); | |
877 | v = apic_read(APIC_LVT0); | |
878 | apic_write(APIC_LVT0, v | APIC_LVT_MASKED); | |
879 | v = apic_read(APIC_LVT1); | |
880 | apic_write(APIC_LVT1, v | APIC_LVT_MASKED); | |
881 | if (maxlvt >= 4) { | |
882 | v = apic_read(APIC_LVTPC); | |
883 | apic_write(APIC_LVTPC, v | APIC_LVT_MASKED); | |
884 | } | |
885 | ||
6764014b | 886 | /* lets not touch this if we didn't frob it */ |
07db1c14 | 887 | #if defined(CONFIG_X86_MCE_P4THERMAL) || defined(CONFIG_X86_MCE_INTEL) |
6764014b CG |
888 | if (maxlvt >= 5) { |
889 | v = apic_read(APIC_LVTTHMR); | |
890 | apic_write(APIC_LVTTHMR, v | APIC_LVT_MASKED); | |
891 | } | |
892 | #endif | |
5ca8681c AK |
893 | #ifdef CONFIG_X86_MCE_INTEL |
894 | if (maxlvt >= 6) { | |
895 | v = apic_read(APIC_LVTCMCI); | |
896 | if (!(v & APIC_LVT_MASKED)) | |
897 | apic_write(APIC_LVTCMCI, v | APIC_LVT_MASKED); | |
898 | } | |
899 | #endif | |
900 | ||
0e078e2f TG |
901 | /* |
902 | * Clean APIC state for other OSs: | |
903 | */ | |
904 | apic_write(APIC_LVTT, APIC_LVT_MASKED); | |
905 | apic_write(APIC_LVT0, APIC_LVT_MASKED); | |
906 | apic_write(APIC_LVT1, APIC_LVT_MASKED); | |
907 | if (maxlvt >= 3) | |
908 | apic_write(APIC_LVTERR, APIC_LVT_MASKED); | |
909 | if (maxlvt >= 4) | |
910 | apic_write(APIC_LVTPC, APIC_LVT_MASKED); | |
6764014b CG |
911 | |
912 | /* Integrated APIC (!82489DX) ? */ | |
913 | if (lapic_is_integrated()) { | |
914 | if (maxlvt > 3) | |
915 | /* Clear ESR due to Pentium errata 3AP and 11AP */ | |
916 | apic_write(APIC_ESR, 0); | |
917 | apic_read(APIC_ESR); | |
918 | } | |
0e078e2f TG |
919 | } |
920 | ||
921 | /** | |
922 | * disable_local_APIC - clear and disable the local APIC | |
923 | */ | |
924 | void disable_local_APIC(void) | |
925 | { | |
926 | unsigned int value; | |
927 | ||
4a13ad0b JB |
928 | /* APIC hasn't been mapped yet */ |
929 | if (!apic_phys) | |
930 | return; | |
931 | ||
0e078e2f TG |
932 | clear_local_APIC(); |
933 | ||
934 | /* | |
935 | * Disable APIC (implies clearing of registers | |
936 | * for 82489DX!). | |
937 | */ | |
938 | value = apic_read(APIC_SPIV); | |
939 | value &= ~APIC_SPIV_APIC_ENABLED; | |
940 | apic_write(APIC_SPIV, value); | |
990b183e CG |
941 | |
942 | #ifdef CONFIG_X86_32 | |
943 | /* | |
944 | * When LAPIC was disabled by the BIOS and enabled by the kernel, | |
945 | * restore the disabled state. | |
946 | */ | |
947 | if (enabled_via_apicbase) { | |
948 | unsigned int l, h; | |
949 | ||
950 | rdmsr(MSR_IA32_APICBASE, l, h); | |
951 | l &= ~MSR_IA32_APICBASE_ENABLE; | |
952 | wrmsr(MSR_IA32_APICBASE, l, h); | |
953 | } | |
954 | #endif | |
0e078e2f TG |
955 | } |
956 | ||
fe4024dc CG |
957 | /* |
958 | * If Linux enabled the LAPIC against the BIOS default disable it down before | |
959 | * re-entering the BIOS on shutdown. Otherwise the BIOS may get confused and | |
960 | * not power-off. Additionally clear all LVT entries before disable_local_APIC | |
961 | * for the case where Linux didn't enable the LAPIC. | |
962 | */ | |
0e078e2f TG |
963 | void lapic_shutdown(void) |
964 | { | |
965 | unsigned long flags; | |
966 | ||
967 | if (!cpu_has_apic) | |
968 | return; | |
969 | ||
970 | local_irq_save(flags); | |
971 | ||
fe4024dc CG |
972 | #ifdef CONFIG_X86_32 |
973 | if (!enabled_via_apicbase) | |
974 | clear_local_APIC(); | |
975 | else | |
976 | #endif | |
977 | disable_local_APIC(); | |
978 | ||
0e078e2f TG |
979 | |
980 | local_irq_restore(flags); | |
981 | } | |
982 | ||
983 | /* | |
984 | * This is to verify that we're looking at a real local APIC. | |
985 | * Check these against your board if the CPUs aren't getting | |
986 | * started for no apparent reason. | |
987 | */ | |
988 | int __init verify_local_APIC(void) | |
989 | { | |
990 | unsigned int reg0, reg1; | |
991 | ||
992 | /* | |
993 | * The version register is read-only in a real APIC. | |
994 | */ | |
995 | reg0 = apic_read(APIC_LVR); | |
996 | apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg0); | |
997 | apic_write(APIC_LVR, reg0 ^ APIC_LVR_MASK); | |
998 | reg1 = apic_read(APIC_LVR); | |
999 | apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg1); | |
1000 | ||
1001 | /* | |
1002 | * The two version reads above should print the same | |
1003 | * numbers. If the second one is different, then we | |
1004 | * poke at a non-APIC. | |
1005 | */ | |
1006 | if (reg1 != reg0) | |
1007 | return 0; | |
1008 | ||
1009 | /* | |
1010 | * Check if the version looks reasonably. | |
1011 | */ | |
1012 | reg1 = GET_APIC_VERSION(reg0); | |
1013 | if (reg1 == 0x00 || reg1 == 0xff) | |
1014 | return 0; | |
1015 | reg1 = lapic_get_maxlvt(); | |
1016 | if (reg1 < 0x02 || reg1 == 0xff) | |
1017 | return 0; | |
1018 | ||
1019 | /* | |
1020 | * The ID register is read/write in a real APIC. | |
1021 | */ | |
2d7a66d0 | 1022 | reg0 = apic_read(APIC_ID); |
0e078e2f | 1023 | apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg0); |
5b812727 | 1024 | apic_write(APIC_ID, reg0 ^ apic->apic_id_mask); |
2d7a66d0 | 1025 | reg1 = apic_read(APIC_ID); |
0e078e2f TG |
1026 | apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg1); |
1027 | apic_write(APIC_ID, reg0); | |
5b812727 | 1028 | if (reg1 != (reg0 ^ apic->apic_id_mask)) |
0e078e2f TG |
1029 | return 0; |
1030 | ||
1031 | /* | |
1da177e4 LT |
1032 | * The next two are just to see if we have sane values. |
1033 | * They're only really relevant if we're in Virtual Wire | |
1034 | * compatibility mode, but most boxes are anymore. | |
1035 | */ | |
1036 | reg0 = apic_read(APIC_LVT0); | |
0e078e2f | 1037 | apic_printk(APIC_DEBUG, "Getting LVT0: %x\n", reg0); |
1da177e4 LT |
1038 | reg1 = apic_read(APIC_LVT1); |
1039 | apic_printk(APIC_DEBUG, "Getting LVT1: %x\n", reg1); | |
1040 | ||
1041 | return 1; | |
1042 | } | |
1043 | ||
0e078e2f TG |
1044 | /** |
1045 | * sync_Arb_IDs - synchronize APIC bus arbitration IDs | |
1046 | */ | |
1da177e4 LT |
1047 | void __init sync_Arb_IDs(void) |
1048 | { | |
296cb951 CG |
1049 | /* |
1050 | * Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 And not | |
1051 | * needed on AMD. | |
1052 | */ | |
1053 | if (modern_apic() || boot_cpu_data.x86_vendor == X86_VENDOR_AMD) | |
1da177e4 LT |
1054 | return; |
1055 | ||
1056 | /* | |
1057 | * Wait for idle. | |
1058 | */ | |
1059 | apic_wait_icr_idle(); | |
1060 | ||
1061 | apic_printk(APIC_DEBUG, "Synchronizing Arb IDs.\n"); | |
6f6da97f CG |
1062 | apic_write(APIC_ICR, APIC_DEST_ALLINC | |
1063 | APIC_INT_LEVELTRIG | APIC_DM_INIT); | |
1da177e4 LT |
1064 | } |
1065 | ||
1da177e4 LT |
1066 | /* |
1067 | * An initial setup of the virtual wire mode. | |
1068 | */ | |
1069 | void __init init_bsp_APIC(void) | |
1070 | { | |
11a8e778 | 1071 | unsigned int value; |
1da177e4 LT |
1072 | |
1073 | /* | |
1074 | * Don't do the setup now if we have a SMP BIOS as the | |
1075 | * through-I/O-APIC virtual wire mode might be active. | |
1076 | */ | |
1077 | if (smp_found_config || !cpu_has_apic) | |
1078 | return; | |
1079 | ||
1da177e4 LT |
1080 | /* |
1081 | * Do not trust the local APIC being empty at bootup. | |
1082 | */ | |
1083 | clear_local_APIC(); | |
1084 | ||
1085 | /* | |
1086 | * Enable APIC. | |
1087 | */ | |
1088 | value = apic_read(APIC_SPIV); | |
1089 | value &= ~APIC_VECTOR_MASK; | |
1090 | value |= APIC_SPIV_APIC_ENABLED; | |
638c0411 CG |
1091 | |
1092 | #ifdef CONFIG_X86_32 | |
1093 | /* This bit is reserved on P4/Xeon and should be cleared */ | |
1094 | if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) && | |
1095 | (boot_cpu_data.x86 == 15)) | |
1096 | value &= ~APIC_SPIV_FOCUS_DISABLED; | |
1097 | else | |
1098 | #endif | |
1099 | value |= APIC_SPIV_FOCUS_DISABLED; | |
1da177e4 | 1100 | value |= SPURIOUS_APIC_VECTOR; |
11a8e778 | 1101 | apic_write(APIC_SPIV, value); |
1da177e4 LT |
1102 | |
1103 | /* | |
1104 | * Set up the virtual wire mode. | |
1105 | */ | |
11a8e778 | 1106 | apic_write(APIC_LVT0, APIC_DM_EXTINT); |
1da177e4 | 1107 | value = APIC_DM_NMI; |
638c0411 CG |
1108 | if (!lapic_is_integrated()) /* 82489DX */ |
1109 | value |= APIC_LVT_LEVEL_TRIGGER; | |
11a8e778 | 1110 | apic_write(APIC_LVT1, value); |
1da177e4 LT |
1111 | } |
1112 | ||
c43da2f5 CG |
1113 | static void __cpuinit lapic_setup_esr(void) |
1114 | { | |
9df08f10 CG |
1115 | unsigned int oldvalue, value, maxlvt; |
1116 | ||
1117 | if (!lapic_is_integrated()) { | |
ba21ebb6 | 1118 | pr_info("No ESR for 82489DX.\n"); |
9df08f10 CG |
1119 | return; |
1120 | } | |
c43da2f5 | 1121 | |
08125d3e | 1122 | if (apic->disable_esr) { |
c43da2f5 | 1123 | /* |
9df08f10 CG |
1124 | * Something untraceable is creating bad interrupts on |
1125 | * secondary quads ... for the moment, just leave the | |
1126 | * ESR disabled - we can't do anything useful with the | |
1127 | * errors anyway - mbligh | |
c43da2f5 | 1128 | */ |
ba21ebb6 | 1129 | pr_info("Leaving ESR disabled.\n"); |
9df08f10 | 1130 | return; |
c43da2f5 | 1131 | } |
9df08f10 CG |
1132 | |
1133 | maxlvt = lapic_get_maxlvt(); | |
1134 | if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */ | |
1135 | apic_write(APIC_ESR, 0); | |
1136 | oldvalue = apic_read(APIC_ESR); | |
1137 | ||
1138 | /* enables sending errors */ | |
1139 | value = ERROR_APIC_VECTOR; | |
1140 | apic_write(APIC_LVTERR, value); | |
1141 | ||
1142 | /* | |
1143 | * spec says clear errors after enabling vector. | |
1144 | */ | |
1145 | if (maxlvt > 3) | |
1146 | apic_write(APIC_ESR, 0); | |
1147 | value = apic_read(APIC_ESR); | |
1148 | if (value != oldvalue) | |
1149 | apic_printk(APIC_VERBOSE, "ESR value before enabling " | |
1150 | "vector: 0x%08x after: 0x%08x\n", | |
1151 | oldvalue, value); | |
c43da2f5 CG |
1152 | } |
1153 | ||
1154 | ||
0e078e2f TG |
1155 | /** |
1156 | * setup_local_APIC - setup the local APIC | |
1157 | */ | |
1158 | void __cpuinit setup_local_APIC(void) | |
1da177e4 | 1159 | { |
739f33b3 | 1160 | unsigned int value; |
da7ed9f9 | 1161 | int i, j; |
1da177e4 | 1162 | |
f1182638 | 1163 | if (disable_apic) { |
65a4e574 | 1164 | arch_disable_smp_support(); |
f1182638 JB |
1165 | return; |
1166 | } | |
1167 | ||
89c38c28 CG |
1168 | #ifdef CONFIG_X86_32 |
1169 | /* Pound the ESR really hard over the head with a big hammer - mbligh */ | |
08125d3e | 1170 | if (lapic_is_integrated() && apic->disable_esr) { |
89c38c28 CG |
1171 | apic_write(APIC_ESR, 0); |
1172 | apic_write(APIC_ESR, 0); | |
1173 | apic_write(APIC_ESR, 0); | |
1174 | apic_write(APIC_ESR, 0); | |
1175 | } | |
1176 | #endif | |
1177 | ||
ac23d4ee | 1178 | preempt_disable(); |
1da177e4 | 1179 | |
1da177e4 LT |
1180 | /* |
1181 | * Double-check whether this APIC is really registered. | |
1182 | * This is meaningless in clustered apic mode, so we skip it. | |
1183 | */ | |
7ed248da | 1184 | if (!apic->apic_id_registered()) |
1da177e4 LT |
1185 | BUG(); |
1186 | ||
1187 | /* | |
1188 | * Intel recommends to set DFR, LDR and TPR before enabling | |
1189 | * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel | |
1190 | * document number 292116). So here it goes... | |
1191 | */ | |
a5c43296 | 1192 | apic->init_apic_ldr(); |
1da177e4 LT |
1193 | |
1194 | /* | |
1195 | * Set Task Priority to 'accept all'. We never change this | |
1196 | * later on. | |
1197 | */ | |
1198 | value = apic_read(APIC_TASKPRI); | |
1199 | value &= ~APIC_TPRI_MASK; | |
11a8e778 | 1200 | apic_write(APIC_TASKPRI, value); |
1da177e4 | 1201 | |
da7ed9f9 VG |
1202 | /* |
1203 | * After a crash, we no longer service the interrupts and a pending | |
1204 | * interrupt from previous kernel might still have ISR bit set. | |
1205 | * | |
1206 | * Most probably by now CPU has serviced that pending interrupt and | |
1207 | * it might not have done the ack_APIC_irq() because it thought, | |
1208 | * interrupt came from i8259 as ExtInt. LAPIC did not get EOI so it | |
1209 | * does not clear the ISR bit and cpu thinks it has already serivced | |
1210 | * the interrupt. Hence a vector might get locked. It was noticed | |
1211 | * for timer irq (vector 0x31). Issue an extra EOI to clear ISR. | |
1212 | */ | |
1213 | for (i = APIC_ISR_NR - 1; i >= 0; i--) { | |
1214 | value = apic_read(APIC_ISR + i*0x10); | |
1215 | for (j = 31; j >= 0; j--) { | |
1216 | if (value & (1<<j)) | |
1217 | ack_APIC_irq(); | |
1218 | } | |
1219 | } | |
1220 | ||
1da177e4 LT |
1221 | /* |
1222 | * Now that we are all set up, enable the APIC | |
1223 | */ | |
1224 | value = apic_read(APIC_SPIV); | |
1225 | value &= ~APIC_VECTOR_MASK; | |
1226 | /* | |
1227 | * Enable APIC | |
1228 | */ | |
1229 | value |= APIC_SPIV_APIC_ENABLED; | |
1230 | ||
89c38c28 CG |
1231 | #ifdef CONFIG_X86_32 |
1232 | /* | |
1233 | * Some unknown Intel IO/APIC (or APIC) errata is biting us with | |
1234 | * certain networking cards. If high frequency interrupts are | |
1235 | * happening on a particular IOAPIC pin, plus the IOAPIC routing | |
1236 | * entry is masked/unmasked at a high rate as well then sooner or | |
1237 | * later IOAPIC line gets 'stuck', no more interrupts are received | |
1238 | * from the device. If focus CPU is disabled then the hang goes | |
1239 | * away, oh well :-( | |
1240 | * | |
1241 | * [ This bug can be reproduced easily with a level-triggered | |
1242 | * PCI Ne2000 networking cards and PII/PIII processors, dual | |
1243 | * BX chipset. ] | |
1244 | */ | |
1245 | /* | |
1246 | * Actually disabling the focus CPU check just makes the hang less | |
1247 | * frequent as it makes the interrupt distributon model be more | |
1248 | * like LRU than MRU (the short-term load is more even across CPUs). | |
1249 | * See also the comment in end_level_ioapic_irq(). --macro | |
1250 | */ | |
1251 | ||
1252 | /* | |
1253 | * - enable focus processor (bit==0) | |
1254 | * - 64bit mode always use processor focus | |
1255 | * so no need to set it | |
1256 | */ | |
1257 | value &= ~APIC_SPIV_FOCUS_DISABLED; | |
1258 | #endif | |
3f14c746 | 1259 | |
1da177e4 LT |
1260 | /* |
1261 | * Set spurious IRQ vector | |
1262 | */ | |
1263 | value |= SPURIOUS_APIC_VECTOR; | |
11a8e778 | 1264 | apic_write(APIC_SPIV, value); |
1da177e4 LT |
1265 | |
1266 | /* | |
1267 | * Set up LVT0, LVT1: | |
1268 | * | |
1269 | * set up through-local-APIC on the BP's LINT0. This is not | |
1270 | * strictly necessary in pure symmetric-IO mode, but sometimes | |
1271 | * we delegate interrupts to the 8259A. | |
1272 | */ | |
1273 | /* | |
1274 | * TODO: set up through-local-APIC from through-I/O-APIC? --macro | |
1275 | */ | |
1276 | value = apic_read(APIC_LVT0) & APIC_LVT_MASKED; | |
89c38c28 | 1277 | if (!smp_processor_id() && (pic_mode || !value)) { |
1da177e4 | 1278 | value = APIC_DM_EXTINT; |
bc1d99c1 | 1279 | apic_printk(APIC_VERBOSE, "enabled ExtINT on CPU#%d\n", |
89c38c28 | 1280 | smp_processor_id()); |
1da177e4 LT |
1281 | } else { |
1282 | value = APIC_DM_EXTINT | APIC_LVT_MASKED; | |
bc1d99c1 | 1283 | apic_printk(APIC_VERBOSE, "masked ExtINT on CPU#%d\n", |
89c38c28 | 1284 | smp_processor_id()); |
1da177e4 | 1285 | } |
11a8e778 | 1286 | apic_write(APIC_LVT0, value); |
1da177e4 LT |
1287 | |
1288 | /* | |
1289 | * only the BP should see the LINT1 NMI signal, obviously. | |
1290 | */ | |
1291 | if (!smp_processor_id()) | |
1292 | value = APIC_DM_NMI; | |
1293 | else | |
1294 | value = APIC_DM_NMI | APIC_LVT_MASKED; | |
89c38c28 CG |
1295 | if (!lapic_is_integrated()) /* 82489DX */ |
1296 | value |= APIC_LVT_LEVEL_TRIGGER; | |
11a8e778 | 1297 | apic_write(APIC_LVT1, value); |
89c38c28 | 1298 | |
ac23d4ee | 1299 | preempt_enable(); |
be71b855 AK |
1300 | |
1301 | #ifdef CONFIG_X86_MCE_INTEL | |
1302 | /* Recheck CMCI information after local APIC is up on CPU #0 */ | |
1303 | if (smp_processor_id() == 0) | |
1304 | cmci_recheck(); | |
1305 | #endif | |
739f33b3 | 1306 | } |
1da177e4 | 1307 | |
739f33b3 AK |
1308 | void __cpuinit end_local_APIC_setup(void) |
1309 | { | |
1310 | lapic_setup_esr(); | |
fa6b95fc CG |
1311 | |
1312 | #ifdef CONFIG_X86_32 | |
1b4ee4e4 CG |
1313 | { |
1314 | unsigned int value; | |
1315 | /* Disable the local apic timer */ | |
1316 | value = apic_read(APIC_LVTT); | |
1317 | value |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR); | |
1318 | apic_write(APIC_LVTT, value); | |
1319 | } | |
fa6b95fc CG |
1320 | #endif |
1321 | ||
f2802e7f | 1322 | setup_apic_nmi_watchdog(NULL); |
0e078e2f | 1323 | apic_pm_activate(); |
1da177e4 | 1324 | } |
1da177e4 | 1325 | |
06cd9a7d | 1326 | #ifdef CONFIG_X86_X2APIC |
6e1cb38a SS |
1327 | void check_x2apic(void) |
1328 | { | |
ef1f87aa | 1329 | if (x2apic_enabled()) { |
ba21ebb6 | 1330 | pr_info("x2apic enabled by BIOS, switching to x2apic ops\n"); |
6e1cb38a | 1331 | x2apic_preenabled = x2apic = 1; |
6e1cb38a SS |
1332 | } |
1333 | } | |
1334 | ||
1335 | void enable_x2apic(void) | |
1336 | { | |
1337 | int msr, msr2; | |
1338 | ||
06cd9a7d YL |
1339 | if (!x2apic) |
1340 | return; | |
1341 | ||
6e1cb38a SS |
1342 | rdmsr(MSR_IA32_APICBASE, msr, msr2); |
1343 | if (!(msr & X2APIC_ENABLE)) { | |
ba21ebb6 | 1344 | pr_info("Enabling x2apic\n"); |
6e1cb38a SS |
1345 | wrmsr(MSR_IA32_APICBASE, msr | X2APIC_ENABLE, 0); |
1346 | } | |
1347 | } | |
1348 | ||
2236d252 | 1349 | void __init enable_IR_x2apic(void) |
6e1cb38a SS |
1350 | { |
1351 | #ifdef CONFIG_INTR_REMAP | |
1352 | int ret; | |
1353 | unsigned long flags; | |
b24696bc | 1354 | struct IO_APIC_route_entry **ioapic_entries = NULL; |
6e1cb38a SS |
1355 | |
1356 | if (!cpu_has_x2apic) | |
1357 | return; | |
1358 | ||
1359 | if (!x2apic_preenabled && disable_x2apic) { | |
ba21ebb6 CG |
1360 | pr_info("Skipped enabling x2apic and Interrupt-remapping " |
1361 | "because of nox2apic\n"); | |
6e1cb38a SS |
1362 | return; |
1363 | } | |
1364 | ||
1365 | if (x2apic_preenabled && disable_x2apic) | |
1366 | panic("Bios already enabled x2apic, can't enforce nox2apic"); | |
1367 | ||
1368 | if (!x2apic_preenabled && skip_ioapic_setup) { | |
ba21ebb6 CG |
1369 | pr_info("Skipped enabling x2apic and Interrupt-remapping " |
1370 | "because of skipping io-apic setup\n"); | |
6e1cb38a SS |
1371 | return; |
1372 | } | |
1373 | ||
1374 | ret = dmar_table_init(); | |
1375 | if (ret) { | |
ba21ebb6 | 1376 | pr_info("dmar_table_init() failed with %d:\n", ret); |
6e1cb38a SS |
1377 | |
1378 | if (x2apic_preenabled) | |
1379 | panic("x2apic enabled by bios. But IR enabling failed"); | |
1380 | else | |
ba21ebb6 | 1381 | pr_info("Not enabling x2apic,Intr-remapping\n"); |
6e1cb38a SS |
1382 | return; |
1383 | } | |
1384 | ||
b24696bc FY |
1385 | ioapic_entries = alloc_ioapic_entries(); |
1386 | if (!ioapic_entries) { | |
1387 | pr_info("Allocate ioapic_entries failed: %d\n", ret); | |
1388 | goto end; | |
1389 | } | |
1390 | ||
1391 | ret = save_IO_APIC_setup(ioapic_entries); | |
5ffa4eb2 | 1392 | if (ret) { |
ba21ebb6 | 1393 | pr_info("Saving IO-APIC state failed: %d\n", ret); |
5ffa4eb2 CG |
1394 | goto end; |
1395 | } | |
6e1cb38a | 1396 | |
05c3dc2c | 1397 | local_irq_save(flags); |
b24696bc | 1398 | mask_IO_APIC_setup(ioapic_entries); |
05c3dc2c SS |
1399 | mask_8259A(); |
1400 | ||
b24696bc | 1401 | ret = enable_intr_remapping(EIM_32BIT_APIC_ID); |
6e1cb38a SS |
1402 | |
1403 | if (ret && x2apic_preenabled) { | |
1404 | local_irq_restore(flags); | |
1405 | panic("x2apic enabled by bios. But IR enabling failed"); | |
1406 | } | |
1407 | ||
1408 | if (ret) | |
5ffa4eb2 | 1409 | goto end_restore; |
6e1cb38a SS |
1410 | |
1411 | if (!x2apic) { | |
1412 | x2apic = 1; | |
6e1cb38a SS |
1413 | enable_x2apic(); |
1414 | } | |
5ffa4eb2 CG |
1415 | |
1416 | end_restore: | |
6e1cb38a SS |
1417 | if (ret) |
1418 | /* | |
1419 | * IR enabling failed | |
1420 | */ | |
b24696bc | 1421 | restore_IO_APIC_setup(ioapic_entries); |
6e1cb38a | 1422 | else |
b24696bc | 1423 | reinit_intr_remapped_IO_APIC(x2apic_preenabled, ioapic_entries); |
6e1cb38a SS |
1424 | |
1425 | unmask_8259A(); | |
1426 | local_irq_restore(flags); | |
1427 | ||
05c3dc2c | 1428 | end: |
6e1cb38a SS |
1429 | if (!ret) { |
1430 | if (!x2apic_preenabled) | |
ba21ebb6 | 1431 | pr_info("Enabled x2apic and interrupt-remapping\n"); |
6e1cb38a | 1432 | else |
ba21ebb6 | 1433 | pr_info("Enabled Interrupt-remapping\n"); |
6e1cb38a | 1434 | } else |
ba21ebb6 | 1435 | pr_err("Failed to enable Interrupt-remapping and x2apic\n"); |
b24696bc FY |
1436 | if (ioapic_entries) |
1437 | free_ioapic_entries(ioapic_entries); | |
6e1cb38a SS |
1438 | #else |
1439 | if (!cpu_has_x2apic) | |
1440 | return; | |
1441 | ||
1442 | if (x2apic_preenabled) | |
1443 | panic("x2apic enabled prior OS handover," | |
1444 | " enable CONFIG_INTR_REMAP"); | |
1445 | ||
ba21ebb6 CG |
1446 | pr_info("Enable CONFIG_INTR_REMAP for enabling intr-remapping " |
1447 | " and x2apic\n"); | |
6e1cb38a SS |
1448 | #endif |
1449 | ||
1450 | return; | |
1451 | } | |
06cd9a7d | 1452 | #endif /* CONFIG_X86_X2APIC */ |
6e1cb38a | 1453 | |
be7a656f | 1454 | #ifdef CONFIG_X86_64 |
1da177e4 LT |
1455 | /* |
1456 | * Detect and enable local APICs on non-SMP boards. | |
1457 | * Original code written by Keir Fraser. | |
1458 | * On AMD64 we trust the BIOS - if it says no APIC it is likely | |
6935d1f9 | 1459 | * not correctly set up (usually the APIC timer won't work etc.) |
1da177e4 | 1460 | */ |
0e078e2f | 1461 | static int __init detect_init_APIC(void) |
1da177e4 LT |
1462 | { |
1463 | if (!cpu_has_apic) { | |
ba21ebb6 | 1464 | pr_info("No local APIC present\n"); |
1da177e4 LT |
1465 | return -1; |
1466 | } | |
1467 | ||
1468 | mp_lapic_addr = APIC_DEFAULT_PHYS_BASE; | |
c70dcb74 | 1469 | boot_cpu_physical_apicid = 0; |
1da177e4 LT |
1470 | return 0; |
1471 | } | |
be7a656f YL |
1472 | #else |
1473 | /* | |
1474 | * Detect and initialize APIC | |
1475 | */ | |
1476 | static int __init detect_init_APIC(void) | |
1477 | { | |
1478 | u32 h, l, features; | |
1479 | ||
1480 | /* Disabled by kernel option? */ | |
1481 | if (disable_apic) | |
1482 | return -1; | |
1483 | ||
1484 | switch (boot_cpu_data.x86_vendor) { | |
1485 | case X86_VENDOR_AMD: | |
1486 | if ((boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model > 1) || | |
85877061 | 1487 | (boot_cpu_data.x86 >= 15)) |
be7a656f YL |
1488 | break; |
1489 | goto no_apic; | |
1490 | case X86_VENDOR_INTEL: | |
1491 | if (boot_cpu_data.x86 == 6 || boot_cpu_data.x86 == 15 || | |
1492 | (boot_cpu_data.x86 == 5 && cpu_has_apic)) | |
1493 | break; | |
1494 | goto no_apic; | |
1495 | default: | |
1496 | goto no_apic; | |
1497 | } | |
1498 | ||
1499 | if (!cpu_has_apic) { | |
1500 | /* | |
1501 | * Over-ride BIOS and try to enable the local APIC only if | |
1502 | * "lapic" specified. | |
1503 | */ | |
1504 | if (!force_enable_local_apic) { | |
ba21ebb6 CG |
1505 | pr_info("Local APIC disabled by BIOS -- " |
1506 | "you can enable it with \"lapic\"\n"); | |
be7a656f YL |
1507 | return -1; |
1508 | } | |
1509 | /* | |
1510 | * Some BIOSes disable the local APIC in the APIC_BASE | |
1511 | * MSR. This can only be done in software for Intel P6 or later | |
1512 | * and AMD K7 (Model > 1) or later. | |
1513 | */ | |
1514 | rdmsr(MSR_IA32_APICBASE, l, h); | |
1515 | if (!(l & MSR_IA32_APICBASE_ENABLE)) { | |
ba21ebb6 | 1516 | pr_info("Local APIC disabled by BIOS -- reenabling.\n"); |
be7a656f YL |
1517 | l &= ~MSR_IA32_APICBASE_BASE; |
1518 | l |= MSR_IA32_APICBASE_ENABLE | APIC_DEFAULT_PHYS_BASE; | |
1519 | wrmsr(MSR_IA32_APICBASE, l, h); | |
1520 | enabled_via_apicbase = 1; | |
1521 | } | |
1522 | } | |
1523 | /* | |
1524 | * The APIC feature bit should now be enabled | |
1525 | * in `cpuid' | |
1526 | */ | |
1527 | features = cpuid_edx(1); | |
1528 | if (!(features & (1 << X86_FEATURE_APIC))) { | |
ba21ebb6 | 1529 | pr_warning("Could not enable APIC!\n"); |
be7a656f YL |
1530 | return -1; |
1531 | } | |
1532 | set_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC); | |
1533 | mp_lapic_addr = APIC_DEFAULT_PHYS_BASE; | |
1534 | ||
1535 | /* The BIOS may have set up the APIC at some other address */ | |
1536 | rdmsr(MSR_IA32_APICBASE, l, h); | |
1537 | if (l & MSR_IA32_APICBASE_ENABLE) | |
1538 | mp_lapic_addr = l & MSR_IA32_APICBASE_BASE; | |
1539 | ||
ba21ebb6 | 1540 | pr_info("Found and enabled local APIC!\n"); |
be7a656f YL |
1541 | |
1542 | apic_pm_activate(); | |
1543 | ||
1544 | return 0; | |
1545 | ||
1546 | no_apic: | |
ba21ebb6 | 1547 | pr_info("No local APIC present or hardware disabled\n"); |
be7a656f YL |
1548 | return -1; |
1549 | } | |
1550 | #endif | |
1da177e4 | 1551 | |
f28c0ae2 | 1552 | #ifdef CONFIG_X86_64 |
8643f9d0 YL |
1553 | void __init early_init_lapic_mapping(void) |
1554 | { | |
431ee79d | 1555 | unsigned long phys_addr; |
8643f9d0 YL |
1556 | |
1557 | /* | |
1558 | * If no local APIC can be found then go out | |
1559 | * : it means there is no mpatable and MADT | |
1560 | */ | |
1561 | if (!smp_found_config) | |
1562 | return; | |
1563 | ||
431ee79d | 1564 | phys_addr = mp_lapic_addr; |
8643f9d0 | 1565 | |
431ee79d | 1566 | set_fixmap_nocache(FIX_APIC_BASE, phys_addr); |
8643f9d0 | 1567 | apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n", |
431ee79d | 1568 | APIC_BASE, phys_addr); |
8643f9d0 YL |
1569 | |
1570 | /* | |
1571 | * Fetch the APIC ID of the BSP in case we have a | |
1572 | * default configuration (or the MP table is broken). | |
1573 | */ | |
4c9961d5 | 1574 | boot_cpu_physical_apicid = read_apic_id(); |
8643f9d0 | 1575 | } |
f28c0ae2 | 1576 | #endif |
8643f9d0 | 1577 | |
0e078e2f TG |
1578 | /** |
1579 | * init_apic_mappings - initialize APIC mappings | |
1580 | */ | |
1da177e4 LT |
1581 | void __init init_apic_mappings(void) |
1582 | { | |
6e1cb38a | 1583 | if (x2apic) { |
4c9961d5 | 1584 | boot_cpu_physical_apicid = read_apic_id(); |
6e1cb38a SS |
1585 | return; |
1586 | } | |
1587 | ||
1da177e4 LT |
1588 | /* |
1589 | * If no local APIC can be found then set up a fake all | |
1590 | * zeroes page to simulate the local APIC and another | |
1591 | * one for the IO-APIC. | |
1592 | */ | |
1593 | if (!smp_found_config && detect_init_APIC()) { | |
1594 | apic_phys = (unsigned long) alloc_bootmem_pages(PAGE_SIZE); | |
1595 | apic_phys = __pa(apic_phys); | |
1596 | } else | |
1597 | apic_phys = mp_lapic_addr; | |
1598 | ||
1599 | set_fixmap_nocache(FIX_APIC_BASE, apic_phys); | |
79c09698 | 1600 | apic_printk(APIC_VERBOSE, "mapped APIC to %08lx (%08lx)\n", |
7ffeeb1e | 1601 | APIC_BASE, apic_phys); |
1da177e4 LT |
1602 | |
1603 | /* | |
1604 | * Fetch the APIC ID of the BSP in case we have a | |
1605 | * default configuration (or the MP table is broken). | |
1606 | */ | |
f28c0ae2 YL |
1607 | if (boot_cpu_physical_apicid == -1U) |
1608 | boot_cpu_physical_apicid = read_apic_id(); | |
08306ce6 CG |
1609 | |
1610 | /* lets check if we may to NOP'ify apic operations */ | |
1611 | if (!cpu_has_apic) { | |
1612 | pr_info("APIC: disable apic facility\n"); | |
1613 | apic_disable(); | |
1614 | } | |
1da177e4 LT |
1615 | } |
1616 | ||
1617 | /* | |
0e078e2f TG |
1618 | * This initializes the IO-APIC and APIC hardware if this is |
1619 | * a UP kernel. | |
1da177e4 | 1620 | */ |
1b313f4a CG |
1621 | int apic_version[MAX_APICS]; |
1622 | ||
0e078e2f | 1623 | int __init APIC_init_uniprocessor(void) |
1da177e4 | 1624 | { |
0e078e2f | 1625 | if (disable_apic) { |
ba21ebb6 | 1626 | pr_info("Apic disabled\n"); |
0e078e2f TG |
1627 | return -1; |
1628 | } | |
f1182638 | 1629 | #ifdef CONFIG_X86_64 |
0e078e2f TG |
1630 | if (!cpu_has_apic) { |
1631 | disable_apic = 1; | |
ba21ebb6 | 1632 | pr_info("Apic disabled by BIOS\n"); |
0e078e2f TG |
1633 | return -1; |
1634 | } | |
fa2bd35a YL |
1635 | #else |
1636 | if (!smp_found_config && !cpu_has_apic) | |
1637 | return -1; | |
1638 | ||
1639 | /* | |
1640 | * Complain if the BIOS pretends there is one. | |
1641 | */ | |
1642 | if (!cpu_has_apic && | |
1643 | APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) { | |
ba21ebb6 CG |
1644 | pr_err("BIOS bug, local APIC 0x%x not detected!...\n", |
1645 | boot_cpu_physical_apicid); | |
fa2bd35a YL |
1646 | clear_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC); |
1647 | return -1; | |
1648 | } | |
1649 | #endif | |
1650 | ||
6e1cb38a | 1651 | enable_IR_x2apic(); |
fa2bd35a | 1652 | #ifdef CONFIG_X86_64 |
72ce0165 | 1653 | default_setup_apic_routing(); |
fa2bd35a | 1654 | #endif |
6e1cb38a | 1655 | |
0e078e2f | 1656 | verify_local_APIC(); |
b5841765 GC |
1657 | connect_bsp_APIC(); |
1658 | ||
fa2bd35a | 1659 | #ifdef CONFIG_X86_64 |
c70dcb74 | 1660 | apic_write(APIC_ID, SET_APIC_ID(boot_cpu_physical_apicid)); |
fa2bd35a YL |
1661 | #else |
1662 | /* | |
1663 | * Hack: In case of kdump, after a crash, kernel might be booting | |
1664 | * on a cpu with non-zero lapic id. But boot_cpu_physical_apicid | |
1665 | * might be zero if read from MP tables. Get it from LAPIC. | |
1666 | */ | |
1667 | # ifdef CONFIG_CRASH_DUMP | |
1668 | boot_cpu_physical_apicid = read_apic_id(); | |
1669 | # endif | |
1670 | #endif | |
1671 | physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map); | |
0e078e2f | 1672 | setup_local_APIC(); |
1da177e4 | 1673 | |
88d0f550 | 1674 | #ifdef CONFIG_X86_IO_APIC |
739f33b3 AK |
1675 | /* |
1676 | * Now enable IO-APICs, actually call clear_IO_APIC | |
98c061b6 | 1677 | * We need clear_IO_APIC before enabling error vector |
739f33b3 AK |
1678 | */ |
1679 | if (!skip_ioapic_setup && nr_ioapics) | |
1680 | enable_IO_APIC(); | |
fa2bd35a | 1681 | #endif |
739f33b3 AK |
1682 | |
1683 | end_local_APIC_setup(); | |
1684 | ||
fa2bd35a | 1685 | #ifdef CONFIG_X86_IO_APIC |
0e078e2f TG |
1686 | if (smp_found_config && !skip_ioapic_setup && nr_ioapics) |
1687 | setup_IO_APIC(); | |
98c061b6 | 1688 | else { |
0e078e2f | 1689 | nr_ioapics = 0; |
98c061b6 YL |
1690 | localise_nmi_watchdog(); |
1691 | } | |
1692 | #else | |
1693 | localise_nmi_watchdog(); | |
fa2bd35a YL |
1694 | #endif |
1695 | ||
98c061b6 | 1696 | setup_boot_clock(); |
fa2bd35a | 1697 | #ifdef CONFIG_X86_64 |
0e078e2f | 1698 | check_nmi_watchdog(); |
fa2bd35a YL |
1699 | #endif |
1700 | ||
0e078e2f | 1701 | return 0; |
1da177e4 LT |
1702 | } |
1703 | ||
1704 | /* | |
0e078e2f | 1705 | * Local APIC interrupts |
1da177e4 LT |
1706 | */ |
1707 | ||
0e078e2f TG |
1708 | /* |
1709 | * This interrupt should _never_ happen with our APIC/SMP architecture | |
1710 | */ | |
dc1528dd | 1711 | void smp_spurious_interrupt(struct pt_regs *regs) |
1da177e4 | 1712 | { |
dc1528dd YL |
1713 | u32 v; |
1714 | ||
0e078e2f TG |
1715 | exit_idle(); |
1716 | irq_enter(); | |
1da177e4 | 1717 | /* |
0e078e2f TG |
1718 | * Check if this really is a spurious interrupt and ACK it |
1719 | * if it is a vectored one. Just in case... | |
1720 | * Spurious interrupts should not be ACKed. | |
1da177e4 | 1721 | */ |
0e078e2f TG |
1722 | v = apic_read(APIC_ISR + ((SPURIOUS_APIC_VECTOR & ~0x1f) >> 1)); |
1723 | if (v & (1 << (SPURIOUS_APIC_VECTOR & 0x1f))) | |
1724 | ack_APIC_irq(); | |
c4d58cbd | 1725 | |
915b0d01 HS |
1726 | inc_irq_stat(irq_spurious_count); |
1727 | ||
dc1528dd | 1728 | /* see sw-dev-man vol 3, chapter 7.4.13.5 */ |
ba21ebb6 CG |
1729 | pr_info("spurious APIC interrupt on CPU#%d, " |
1730 | "should never happen.\n", smp_processor_id()); | |
0e078e2f TG |
1731 | irq_exit(); |
1732 | } | |
1da177e4 | 1733 | |
0e078e2f TG |
1734 | /* |
1735 | * This interrupt should never happen with our APIC/SMP architecture | |
1736 | */ | |
dc1528dd | 1737 | void smp_error_interrupt(struct pt_regs *regs) |
0e078e2f | 1738 | { |
dc1528dd | 1739 | u32 v, v1; |
1da177e4 | 1740 | |
0e078e2f TG |
1741 | exit_idle(); |
1742 | irq_enter(); | |
1743 | /* First tickle the hardware, only then report what went on. -- REW */ | |
1744 | v = apic_read(APIC_ESR); | |
1745 | apic_write(APIC_ESR, 0); | |
1746 | v1 = apic_read(APIC_ESR); | |
1747 | ack_APIC_irq(); | |
1748 | atomic_inc(&irq_err_count); | |
ba7eda4c | 1749 | |
ba21ebb6 CG |
1750 | /* |
1751 | * Here is what the APIC error bits mean: | |
1752 | * 0: Send CS error | |
1753 | * 1: Receive CS error | |
1754 | * 2: Send accept error | |
1755 | * 3: Receive accept error | |
1756 | * 4: Reserved | |
1757 | * 5: Send illegal vector | |
1758 | * 6: Received illegal vector | |
1759 | * 7: Illegal register address | |
1760 | */ | |
1761 | pr_debug("APIC error on CPU%d: %02x(%02x)\n", | |
0e078e2f TG |
1762 | smp_processor_id(), v , v1); |
1763 | irq_exit(); | |
1da177e4 LT |
1764 | } |
1765 | ||
b5841765 | 1766 | /** |
36c9d674 CG |
1767 | * connect_bsp_APIC - attach the APIC to the interrupt system |
1768 | */ | |
b5841765 GC |
1769 | void __init connect_bsp_APIC(void) |
1770 | { | |
36c9d674 CG |
1771 | #ifdef CONFIG_X86_32 |
1772 | if (pic_mode) { | |
1773 | /* | |
1774 | * Do not trust the local APIC being empty at bootup. | |
1775 | */ | |
1776 | clear_local_APIC(); | |
1777 | /* | |
1778 | * PIC mode, enable APIC mode in the IMCR, i.e. connect BSP's | |
1779 | * local APIC to INT and NMI lines. | |
1780 | */ | |
1781 | apic_printk(APIC_VERBOSE, "leaving PIC mode, " | |
1782 | "enabling APIC mode.\n"); | |
c0eaa453 | 1783 | imcr_pic_to_apic(); |
36c9d674 CG |
1784 | } |
1785 | #endif | |
49040333 IM |
1786 | if (apic->enable_apic_mode) |
1787 | apic->enable_apic_mode(); | |
b5841765 GC |
1788 | } |
1789 | ||
274cfe59 CG |
1790 | /** |
1791 | * disconnect_bsp_APIC - detach the APIC from the interrupt system | |
1792 | * @virt_wire_setup: indicates, whether virtual wire mode is selected | |
1793 | * | |
1794 | * Virtual wire mode is necessary to deliver legacy interrupts even when the | |
1795 | * APIC is disabled. | |
1796 | */ | |
0e078e2f | 1797 | void disconnect_bsp_APIC(int virt_wire_setup) |
1da177e4 | 1798 | { |
1b4ee4e4 CG |
1799 | unsigned int value; |
1800 | ||
c177b0bc CG |
1801 | #ifdef CONFIG_X86_32 |
1802 | if (pic_mode) { | |
1803 | /* | |
1804 | * Put the board back into PIC mode (has an effect only on | |
1805 | * certain older boards). Note that APIC interrupts, including | |
1806 | * IPIs, won't work beyond this point! The only exception are | |
1807 | * INIT IPIs. | |
1808 | */ | |
1809 | apic_printk(APIC_VERBOSE, "disabling APIC mode, " | |
1810 | "entering PIC mode.\n"); | |
c0eaa453 | 1811 | imcr_apic_to_pic(); |
c177b0bc CG |
1812 | return; |
1813 | } | |
1814 | #endif | |
1815 | ||
0e078e2f | 1816 | /* Go back to Virtual Wire compatibility mode */ |
1da177e4 | 1817 | |
0e078e2f TG |
1818 | /* For the spurious interrupt use vector F, and enable it */ |
1819 | value = apic_read(APIC_SPIV); | |
1820 | value &= ~APIC_VECTOR_MASK; | |
1821 | value |= APIC_SPIV_APIC_ENABLED; | |
1822 | value |= 0xf; | |
1823 | apic_write(APIC_SPIV, value); | |
b8ce3359 | 1824 | |
0e078e2f TG |
1825 | if (!virt_wire_setup) { |
1826 | /* | |
1827 | * For LVT0 make it edge triggered, active high, | |
1828 | * external and enabled | |
1829 | */ | |
1830 | value = apic_read(APIC_LVT0); | |
1831 | value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING | | |
1832 | APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR | | |
1833 | APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED); | |
1834 | value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING; | |
1835 | value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_EXTINT); | |
1836 | apic_write(APIC_LVT0, value); | |
1837 | } else { | |
1838 | /* Disable LVT0 */ | |
1839 | apic_write(APIC_LVT0, APIC_LVT_MASKED); | |
1840 | } | |
b8ce3359 | 1841 | |
c177b0bc CG |
1842 | /* |
1843 | * For LVT1 make it edge triggered, active high, | |
1844 | * nmi and enabled | |
1845 | */ | |
0e078e2f TG |
1846 | value = apic_read(APIC_LVT1); |
1847 | value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING | | |
1848 | APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR | | |
1849 | APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED); | |
1850 | value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING; | |
1851 | value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_NMI); | |
1852 | apic_write(APIC_LVT1, value); | |
1da177e4 LT |
1853 | } |
1854 | ||
be8a5685 AS |
1855 | void __cpuinit generic_processor_info(int apicid, int version) |
1856 | { | |
1857 | int cpu; | |
be8a5685 | 1858 | |
1b313f4a CG |
1859 | /* |
1860 | * Validate version | |
1861 | */ | |
1862 | if (version == 0x0) { | |
ba21ebb6 | 1863 | pr_warning("BIOS bug, APIC version is 0 for CPU#%d! " |
3b11ce7f MT |
1864 | "fixing up to 0x10. (tell your hw vendor)\n", |
1865 | version); | |
1b313f4a | 1866 | version = 0x10; |
be8a5685 | 1867 | } |
1b313f4a | 1868 | apic_version[apicid] = version; |
be8a5685 | 1869 | |
3b11ce7f MT |
1870 | if (num_processors >= nr_cpu_ids) { |
1871 | int max = nr_cpu_ids; | |
1872 | int thiscpu = max + disabled_cpus; | |
1873 | ||
1874 | pr_warning( | |
1875 | "ACPI: NR_CPUS/possible_cpus limit of %i reached." | |
1876 | " Processor %d/0x%x ignored.\n", max, thiscpu, apicid); | |
1877 | ||
1878 | disabled_cpus++; | |
be8a5685 AS |
1879 | return; |
1880 | } | |
1881 | ||
1882 | num_processors++; | |
3b11ce7f | 1883 | cpu = cpumask_next_zero(-1, cpu_present_mask); |
be8a5685 | 1884 | |
b2b815d8 MT |
1885 | if (version != apic_version[boot_cpu_physical_apicid]) |
1886 | WARN_ONCE(1, | |
1887 | "ACPI: apic version mismatch, bootcpu: %x cpu %d: %x\n", | |
1888 | apic_version[boot_cpu_physical_apicid], cpu, version); | |
1889 | ||
be8a5685 AS |
1890 | physid_set(apicid, phys_cpu_present_map); |
1891 | if (apicid == boot_cpu_physical_apicid) { | |
1892 | /* | |
1893 | * x86_bios_cpu_apicid is required to have processors listed | |
1894 | * in same order as logical cpu numbers. Hence the first | |
1895 | * entry is BSP, and so on. | |
1896 | */ | |
1897 | cpu = 0; | |
1898 | } | |
e0da3364 YL |
1899 | if (apicid > max_physical_apicid) |
1900 | max_physical_apicid = apicid; | |
1901 | ||
1b313f4a CG |
1902 | #ifdef CONFIG_X86_32 |
1903 | /* | |
1904 | * Would be preferable to switch to bigsmp when CONFIG_HOTPLUG_CPU=y | |
1905 | * but we need to work other dependencies like SMP_SUSPEND etc | |
1906 | * before this can be done without some confusion. | |
1907 | * if (CPU_HOTPLUG_ENABLED || num_processors > 8) | |
1908 | * - Ashok Raj <ashok.raj@intel.com> | |
1909 | */ | |
1910 | if (max_physical_apicid >= 8) { | |
1911 | switch (boot_cpu_data.x86_vendor) { | |
1912 | case X86_VENDOR_INTEL: | |
1913 | if (!APIC_XAPIC(version)) { | |
1914 | def_to_bigsmp = 0; | |
1915 | break; | |
1916 | } | |
1917 | /* If P4 and above fall through */ | |
1918 | case X86_VENDOR_AMD: | |
1919 | def_to_bigsmp = 1; | |
1920 | } | |
1921 | } | |
1922 | #endif | |
1923 | ||
3e5095d1 | 1924 | #if defined(CONFIG_SMP) || defined(CONFIG_X86_64) |
f10fcd47 TH |
1925 | early_per_cpu(x86_cpu_to_apicid, cpu) = apicid; |
1926 | early_per_cpu(x86_bios_cpu_apicid, cpu) = apicid; | |
1b313f4a | 1927 | #endif |
be8a5685 | 1928 | |
1de88cd4 MT |
1929 | set_cpu_possible(cpu, true); |
1930 | set_cpu_present(cpu, true); | |
be8a5685 AS |
1931 | } |
1932 | ||
0c81c746 SS |
1933 | int hard_smp_processor_id(void) |
1934 | { | |
1935 | return read_apic_id(); | |
1936 | } | |
1dcdd3d1 IM |
1937 | |
1938 | void default_init_apic_ldr(void) | |
1939 | { | |
1940 | unsigned long val; | |
1941 | ||
1942 | apic_write(APIC_DFR, APIC_DFR_VALUE); | |
1943 | val = apic_read(APIC_LDR) & ~APIC_LDR_MASK; | |
1944 | val |= SET_APIC_LOGICAL_ID(1UL << smp_processor_id()); | |
1945 | apic_write(APIC_LDR, val); | |
1946 | } | |
1947 | ||
1948 | #ifdef CONFIG_X86_32 | |
1949 | int default_apicid_to_node(int logical_apicid) | |
1950 | { | |
1951 | #ifdef CONFIG_SMP | |
1952 | return apicid_2_node[hard_smp_processor_id()]; | |
1953 | #else | |
1954 | return 0; | |
1955 | #endif | |
1956 | } | |
3491998d | 1957 | #endif |
0c81c746 | 1958 | |
89039b37 | 1959 | /* |
0e078e2f | 1960 | * Power management |
89039b37 | 1961 | */ |
0e078e2f TG |
1962 | #ifdef CONFIG_PM |
1963 | ||
1964 | static struct { | |
274cfe59 CG |
1965 | /* |
1966 | * 'active' is true if the local APIC was enabled by us and | |
1967 | * not the BIOS; this signifies that we are also responsible | |
1968 | * for disabling it before entering apm/acpi suspend | |
1969 | */ | |
0e078e2f TG |
1970 | int active; |
1971 | /* r/w apic fields */ | |
1972 | unsigned int apic_id; | |
1973 | unsigned int apic_taskpri; | |
1974 | unsigned int apic_ldr; | |
1975 | unsigned int apic_dfr; | |
1976 | unsigned int apic_spiv; | |
1977 | unsigned int apic_lvtt; | |
1978 | unsigned int apic_lvtpc; | |
1979 | unsigned int apic_lvt0; | |
1980 | unsigned int apic_lvt1; | |
1981 | unsigned int apic_lvterr; | |
1982 | unsigned int apic_tmict; | |
1983 | unsigned int apic_tdcr; | |
1984 | unsigned int apic_thmr; | |
1985 | } apic_pm_state; | |
1986 | ||
1987 | static int lapic_suspend(struct sys_device *dev, pm_message_t state) | |
1988 | { | |
1989 | unsigned long flags; | |
1990 | int maxlvt; | |
89039b37 | 1991 | |
0e078e2f TG |
1992 | if (!apic_pm_state.active) |
1993 | return 0; | |
89039b37 | 1994 | |
0e078e2f | 1995 | maxlvt = lapic_get_maxlvt(); |
89039b37 | 1996 | |
2d7a66d0 | 1997 | apic_pm_state.apic_id = apic_read(APIC_ID); |
0e078e2f TG |
1998 | apic_pm_state.apic_taskpri = apic_read(APIC_TASKPRI); |
1999 | apic_pm_state.apic_ldr = apic_read(APIC_LDR); | |
2000 | apic_pm_state.apic_dfr = apic_read(APIC_DFR); | |
2001 | apic_pm_state.apic_spiv = apic_read(APIC_SPIV); | |
2002 | apic_pm_state.apic_lvtt = apic_read(APIC_LVTT); | |
2003 | if (maxlvt >= 4) | |
2004 | apic_pm_state.apic_lvtpc = apic_read(APIC_LVTPC); | |
2005 | apic_pm_state.apic_lvt0 = apic_read(APIC_LVT0); | |
2006 | apic_pm_state.apic_lvt1 = apic_read(APIC_LVT1); | |
2007 | apic_pm_state.apic_lvterr = apic_read(APIC_LVTERR); | |
2008 | apic_pm_state.apic_tmict = apic_read(APIC_TMICT); | |
2009 | apic_pm_state.apic_tdcr = apic_read(APIC_TDCR); | |
24968cfd | 2010 | #if defined(CONFIG_X86_MCE_P4THERMAL) || defined(CONFIG_X86_MCE_INTEL) |
0e078e2f TG |
2011 | if (maxlvt >= 5) |
2012 | apic_pm_state.apic_thmr = apic_read(APIC_LVTTHMR); | |
2013 | #endif | |
24968cfd | 2014 | |
0e078e2f TG |
2015 | local_irq_save(flags); |
2016 | disable_local_APIC(); | |
b24696bc FY |
2017 | #ifdef CONFIG_INTR_REMAP |
2018 | if (intr_remapping_enabled) | |
2019 | disable_intr_remapping(); | |
2020 | #endif | |
0e078e2f TG |
2021 | local_irq_restore(flags); |
2022 | return 0; | |
1da177e4 LT |
2023 | } |
2024 | ||
0e078e2f | 2025 | static int lapic_resume(struct sys_device *dev) |
1da177e4 | 2026 | { |
0e078e2f TG |
2027 | unsigned int l, h; |
2028 | unsigned long flags; | |
2029 | int maxlvt; | |
1da177e4 | 2030 | |
b24696bc FY |
2031 | #ifdef CONFIG_INTR_REMAP |
2032 | int ret; | |
2033 | struct IO_APIC_route_entry **ioapic_entries = NULL; | |
2034 | ||
0e078e2f TG |
2035 | if (!apic_pm_state.active) |
2036 | return 0; | |
89b831ef | 2037 | |
0e078e2f | 2038 | local_irq_save(flags); |
b24696bc FY |
2039 | if (x2apic) { |
2040 | ioapic_entries = alloc_ioapic_entries(); | |
2041 | if (!ioapic_entries) { | |
2042 | WARN(1, "Alloc ioapic_entries in lapic resume failed."); | |
2043 | return -ENOMEM; | |
2044 | } | |
2045 | ||
2046 | ret = save_IO_APIC_setup(ioapic_entries); | |
2047 | if (ret) { | |
2048 | WARN(1, "Saving IO-APIC state failed: %d\n", ret); | |
2049 | free_ioapic_entries(ioapic_entries); | |
2050 | return ret; | |
2051 | } | |
2052 | ||
2053 | mask_IO_APIC_setup(ioapic_entries); | |
2054 | mask_8259A(); | |
2055 | enable_x2apic(); | |
2056 | } | |
2057 | #else | |
2058 | if (!apic_pm_state.active) | |
2059 | return 0; | |
92206c90 | 2060 | |
b24696bc | 2061 | local_irq_save(flags); |
92206c90 CG |
2062 | if (x2apic) |
2063 | enable_x2apic(); | |
b24696bc FY |
2064 | #endif |
2065 | ||
cf6567fe | 2066 | else { |
92206c90 CG |
2067 | /* |
2068 | * Make sure the APICBASE points to the right address | |
2069 | * | |
2070 | * FIXME! This will be wrong if we ever support suspend on | |
2071 | * SMP! We'll need to do this as part of the CPU restore! | |
2072 | */ | |
6e1cb38a SS |
2073 | rdmsr(MSR_IA32_APICBASE, l, h); |
2074 | l &= ~MSR_IA32_APICBASE_BASE; | |
2075 | l |= MSR_IA32_APICBASE_ENABLE | mp_lapic_addr; | |
2076 | wrmsr(MSR_IA32_APICBASE, l, h); | |
d5e629a6 | 2077 | } |
6e1cb38a | 2078 | |
b24696bc | 2079 | maxlvt = lapic_get_maxlvt(); |
0e078e2f TG |
2080 | apic_write(APIC_LVTERR, ERROR_APIC_VECTOR | APIC_LVT_MASKED); |
2081 | apic_write(APIC_ID, apic_pm_state.apic_id); | |
2082 | apic_write(APIC_DFR, apic_pm_state.apic_dfr); | |
2083 | apic_write(APIC_LDR, apic_pm_state.apic_ldr); | |
2084 | apic_write(APIC_TASKPRI, apic_pm_state.apic_taskpri); | |
2085 | apic_write(APIC_SPIV, apic_pm_state.apic_spiv); | |
2086 | apic_write(APIC_LVT0, apic_pm_state.apic_lvt0); | |
2087 | apic_write(APIC_LVT1, apic_pm_state.apic_lvt1); | |
92206c90 | 2088 | #if defined(CONFIG_X86_MCE_P4THERMAL) || defined(CONFIG_X86_MCE_INTEL) |
0e078e2f TG |
2089 | if (maxlvt >= 5) |
2090 | apic_write(APIC_LVTTHMR, apic_pm_state.apic_thmr); | |
2091 | #endif | |
2092 | if (maxlvt >= 4) | |
2093 | apic_write(APIC_LVTPC, apic_pm_state.apic_lvtpc); | |
2094 | apic_write(APIC_LVTT, apic_pm_state.apic_lvtt); | |
2095 | apic_write(APIC_TDCR, apic_pm_state.apic_tdcr); | |
2096 | apic_write(APIC_TMICT, apic_pm_state.apic_tmict); | |
2097 | apic_write(APIC_ESR, 0); | |
2098 | apic_read(APIC_ESR); | |
2099 | apic_write(APIC_LVTERR, apic_pm_state.apic_lvterr); | |
2100 | apic_write(APIC_ESR, 0); | |
2101 | apic_read(APIC_ESR); | |
92206c90 | 2102 | |
b24696bc FY |
2103 | #ifdef CONFIG_INTR_REMAP |
2104 | if (intr_remapping_enabled) | |
2105 | reenable_intr_remapping(EIM_32BIT_APIC_ID); | |
2106 | ||
2107 | if (x2apic) { | |
2108 | unmask_8259A(); | |
2109 | restore_IO_APIC_setup(ioapic_entries); | |
2110 | free_ioapic_entries(ioapic_entries); | |
2111 | } | |
2112 | #endif | |
2113 | ||
0e078e2f | 2114 | local_irq_restore(flags); |
92206c90 | 2115 | |
b24696bc | 2116 | |
0e078e2f TG |
2117 | return 0; |
2118 | } | |
b8ce3359 | 2119 | |
274cfe59 CG |
2120 | /* |
2121 | * This device has no shutdown method - fully functioning local APICs | |
2122 | * are needed on every CPU up until machine_halt/restart/poweroff. | |
2123 | */ | |
2124 | ||
0e078e2f TG |
2125 | static struct sysdev_class lapic_sysclass = { |
2126 | .name = "lapic", | |
2127 | .resume = lapic_resume, | |
2128 | .suspend = lapic_suspend, | |
2129 | }; | |
b8ce3359 | 2130 | |
0e078e2f | 2131 | static struct sys_device device_lapic = { |
e83a5fdc HS |
2132 | .id = 0, |
2133 | .cls = &lapic_sysclass, | |
0e078e2f | 2134 | }; |
b8ce3359 | 2135 | |
0e078e2f TG |
2136 | static void __cpuinit apic_pm_activate(void) |
2137 | { | |
2138 | apic_pm_state.active = 1; | |
1da177e4 LT |
2139 | } |
2140 | ||
0e078e2f | 2141 | static int __init init_lapic_sysfs(void) |
1da177e4 | 2142 | { |
0e078e2f | 2143 | int error; |
e83a5fdc | 2144 | |
0e078e2f TG |
2145 | if (!cpu_has_apic) |
2146 | return 0; | |
2147 | /* XXX: remove suspend/resume procs if !apic_pm_state.active? */ | |
e83a5fdc | 2148 | |
0e078e2f TG |
2149 | error = sysdev_class_register(&lapic_sysclass); |
2150 | if (!error) | |
2151 | error = sysdev_register(&device_lapic); | |
2152 | return error; | |
1da177e4 | 2153 | } |
b24696bc FY |
2154 | |
2155 | /* local apic needs to resume before other devices access its registers. */ | |
2156 | core_initcall(init_lapic_sysfs); | |
0e078e2f TG |
2157 | |
2158 | #else /* CONFIG_PM */ | |
2159 | ||
2160 | static void apic_pm_activate(void) { } | |
2161 | ||
2162 | #endif /* CONFIG_PM */ | |
1da177e4 | 2163 | |
f28c0ae2 | 2164 | #ifdef CONFIG_X86_64 |
1da177e4 | 2165 | /* |
f8bf3c65 | 2166 | * apic_is_clustered_box() -- Check if we can expect good TSC |
1da177e4 LT |
2167 | * |
2168 | * Thus far, the major user of this is IBM's Summit2 series: | |
2169 | * | |
637029c6 | 2170 | * Clustered boxes may have unsynced TSC problems if they are |
1da177e4 LT |
2171 | * multi-chassis. Use available data to take a good guess. |
2172 | * If in doubt, go HPET. | |
2173 | */ | |
f8bf3c65 | 2174 | __cpuinit int apic_is_clustered_box(void) |
1da177e4 LT |
2175 | { |
2176 | int i, clusters, zeros; | |
2177 | unsigned id; | |
322850af | 2178 | u16 *bios_cpu_apicid; |
1da177e4 LT |
2179 | DECLARE_BITMAP(clustermap, NUM_APIC_CLUSTERS); |
2180 | ||
322850af YL |
2181 | /* |
2182 | * there is not this kind of box with AMD CPU yet. | |
2183 | * Some AMD box with quadcore cpu and 8 sockets apicid | |
2184 | * will be [4, 0x23] or [8, 0x27] could be thought to | |
f8fffa45 | 2185 | * vsmp box still need checking... |
322850af | 2186 | */ |
1cb68487 | 2187 | if ((boot_cpu_data.x86_vendor == X86_VENDOR_AMD) && !is_vsmp_box()) |
322850af YL |
2188 | return 0; |
2189 | ||
23ca4bba | 2190 | bios_cpu_apicid = early_per_cpu_ptr(x86_bios_cpu_apicid); |
376ec33f | 2191 | bitmap_zero(clustermap, NUM_APIC_CLUSTERS); |
1da177e4 | 2192 | |
168ef543 | 2193 | for (i = 0; i < nr_cpu_ids; i++) { |
e8c10ef9 | 2194 | /* are we being called early in kernel startup? */ |
693e3c56 MT |
2195 | if (bios_cpu_apicid) { |
2196 | id = bios_cpu_apicid[i]; | |
e423e33e | 2197 | } else if (i < nr_cpu_ids) { |
e8c10ef9 | 2198 | if (cpu_present(i)) |
2199 | id = per_cpu(x86_bios_cpu_apicid, i); | |
2200 | else | |
2201 | continue; | |
e423e33e | 2202 | } else |
e8c10ef9 | 2203 | break; |
2204 | ||
1da177e4 LT |
2205 | if (id != BAD_APICID) |
2206 | __set_bit(APIC_CLUSTERID(id), clustermap); | |
2207 | } | |
2208 | ||
2209 | /* Problem: Partially populated chassis may not have CPUs in some of | |
2210 | * the APIC clusters they have been allocated. Only present CPUs have | |
602a54a8 | 2211 | * x86_bios_cpu_apicid entries, thus causing zeroes in the bitmap. |
2212 | * Since clusters are allocated sequentially, count zeros only if | |
2213 | * they are bounded by ones. | |
1da177e4 LT |
2214 | */ |
2215 | clusters = 0; | |
2216 | zeros = 0; | |
2217 | for (i = 0; i < NUM_APIC_CLUSTERS; i++) { | |
2218 | if (test_bit(i, clustermap)) { | |
2219 | clusters += 1 + zeros; | |
2220 | zeros = 0; | |
2221 | } else | |
2222 | ++zeros; | |
2223 | } | |
2224 | ||
1cb68487 RT |
2225 | /* ScaleMP vSMPowered boxes have one cluster per board and TSCs are |
2226 | * not guaranteed to be synced between boards | |
2227 | */ | |
2228 | if (is_vsmp_box() && clusters > 1) | |
2229 | return 1; | |
2230 | ||
1da177e4 | 2231 | /* |
f8bf3c65 | 2232 | * If clusters > 2, then should be multi-chassis. |
1da177e4 LT |
2233 | * May have to revisit this when multi-core + hyperthreaded CPUs come |
2234 | * out, but AFAIK this will work even for them. | |
2235 | */ | |
2236 | return (clusters > 2); | |
2237 | } | |
f28c0ae2 | 2238 | #endif |
1da177e4 LT |
2239 | |
2240 | /* | |
0e078e2f | 2241 | * APIC command line parameters |
1da177e4 | 2242 | */ |
789fa735 | 2243 | static int __init setup_disableapic(char *arg) |
6935d1f9 | 2244 | { |
1da177e4 | 2245 | disable_apic = 1; |
9175fc06 | 2246 | setup_clear_cpu_cap(X86_FEATURE_APIC); |
2c8c0e6b AK |
2247 | return 0; |
2248 | } | |
2249 | early_param("disableapic", setup_disableapic); | |
1da177e4 | 2250 | |
2c8c0e6b | 2251 | /* same as disableapic, for compatibility */ |
789fa735 | 2252 | static int __init setup_nolapic(char *arg) |
6935d1f9 | 2253 | { |
789fa735 | 2254 | return setup_disableapic(arg); |
6935d1f9 | 2255 | } |
2c8c0e6b | 2256 | early_param("nolapic", setup_nolapic); |
1da177e4 | 2257 | |
2e7c2838 LT |
2258 | static int __init parse_lapic_timer_c2_ok(char *arg) |
2259 | { | |
2260 | local_apic_timer_c2_ok = 1; | |
2261 | return 0; | |
2262 | } | |
2263 | early_param("lapic_timer_c2_ok", parse_lapic_timer_c2_ok); | |
2264 | ||
36fef094 | 2265 | static int __init parse_disable_apic_timer(char *arg) |
6935d1f9 | 2266 | { |
1da177e4 | 2267 | disable_apic_timer = 1; |
36fef094 | 2268 | return 0; |
6935d1f9 | 2269 | } |
36fef094 CG |
2270 | early_param("noapictimer", parse_disable_apic_timer); |
2271 | ||
2272 | static int __init parse_nolapic_timer(char *arg) | |
2273 | { | |
2274 | disable_apic_timer = 1; | |
2275 | return 0; | |
6935d1f9 | 2276 | } |
36fef094 | 2277 | early_param("nolapic_timer", parse_nolapic_timer); |
73dea47f | 2278 | |
79af9bec CG |
2279 | static int __init apic_set_verbosity(char *arg) |
2280 | { | |
2281 | if (!arg) { | |
2282 | #ifdef CONFIG_X86_64 | |
2283 | skip_ioapic_setup = 0; | |
79af9bec CG |
2284 | return 0; |
2285 | #endif | |
2286 | return -EINVAL; | |
2287 | } | |
2288 | ||
2289 | if (strcmp("debug", arg) == 0) | |
2290 | apic_verbosity = APIC_DEBUG; | |
2291 | else if (strcmp("verbose", arg) == 0) | |
2292 | apic_verbosity = APIC_VERBOSE; | |
2293 | else { | |
ba21ebb6 | 2294 | pr_warning("APIC Verbosity level %s not recognised" |
79af9bec CG |
2295 | " use apic=verbose or apic=debug\n", arg); |
2296 | return -EINVAL; | |
2297 | } | |
2298 | ||
2299 | return 0; | |
2300 | } | |
2301 | early_param("apic", apic_set_verbosity); | |
2302 | ||
1e934dda YL |
2303 | static int __init lapic_insert_resource(void) |
2304 | { | |
2305 | if (!apic_phys) | |
2306 | return -1; | |
2307 | ||
2308 | /* Put local APIC into the resource map. */ | |
2309 | lapic_resource.start = apic_phys; | |
2310 | lapic_resource.end = lapic_resource.start + PAGE_SIZE - 1; | |
2311 | insert_resource(&iomem_resource, &lapic_resource); | |
2312 | ||
2313 | return 0; | |
2314 | } | |
2315 | ||
2316 | /* | |
2317 | * need call insert after e820_reserve_resources() | |
2318 | * that is using request_resource | |
2319 | */ | |
2320 | late_initcall(lapic_insert_resource); |