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 | ||
a63eaf34 | 17 | #include <linux/perf_counter.h> |
1da177e4 | 18 | #include <linux/kernel_stat.h> |
d1de36f5 | 19 | #include <linux/mc146818rtc.h> |
70a20025 | 20 | #include <linux/acpi_pmtmr.h> |
d1de36f5 IM |
21 | #include <linux/clockchips.h> |
22 | #include <linux/interrupt.h> | |
23 | #include <linux/bootmem.h> | |
24 | #include <linux/ftrace.h> | |
25 | #include <linux/ioport.h> | |
e83a5fdc | 26 | #include <linux/module.h> |
d1de36f5 IM |
27 | #include <linux/sysdev.h> |
28 | #include <linux/delay.h> | |
29 | #include <linux/timex.h> | |
6e1cb38a | 30 | #include <linux/dmar.h> |
d1de36f5 IM |
31 | #include <linux/init.h> |
32 | #include <linux/cpu.h> | |
33 | #include <linux/dmi.h> | |
e423e33e | 34 | #include <linux/nmi.h> |
d1de36f5 IM |
35 | #include <linux/smp.h> |
36 | #include <linux/mm.h> | |
1da177e4 | 37 | |
5c167b85 | 38 | #include <asm/perf_counter.h> |
1da177e4 | 39 | #include <asm/pgalloc.h> |
1da177e4 | 40 | #include <asm/atomic.h> |
1da177e4 | 41 | #include <asm/mpspec.h> |
773763df | 42 | #include <asm/i8253.h> |
d1de36f5 | 43 | #include <asm/i8259.h> |
73dea47f | 44 | #include <asm/proto.h> |
2c8c0e6b | 45 | #include <asm/apic.h> |
d1de36f5 IM |
46 | #include <asm/desc.h> |
47 | #include <asm/hpet.h> | |
48 | #include <asm/idle.h> | |
49 | #include <asm/mtrr.h> | |
2bc13797 | 50 | #include <asm/smp.h> |
be71b855 | 51 | #include <asm/mce.h> |
1da177e4 | 52 | |
ec70de8b | 53 | unsigned int num_processors; |
fdbecd9f | 54 | |
ec70de8b | 55 | unsigned disabled_cpus __cpuinitdata; |
fdbecd9f | 56 | |
ec70de8b BG |
57 | /* Processor that is doing the boot up */ |
58 | unsigned int boot_cpu_physical_apicid = -1U; | |
5af5573e | 59 | |
80e5609c | 60 | /* |
fdbecd9f IM |
61 | * The highest APIC ID seen during enumeration. |
62 | * | |
63 | * This determines the messaging protocol we can use: if all APIC IDs | |
64 | * are in the 0 ... 7 range, then we can use logical addressing which | |
65 | * has some performance advantages (better broadcasting). | |
66 | * | |
67 | * If there's an APIC ID above 8, we use physical addressing. | |
80e5609c | 68 | */ |
ec70de8b | 69 | unsigned int max_physical_apicid; |
5af5573e | 70 | |
80e5609c | 71 | /* |
fdbecd9f | 72 | * Bitmask of physically existing CPUs: |
80e5609c | 73 | */ |
ec70de8b BG |
74 | physid_mask_t phys_cpu_present_map; |
75 | ||
76 | /* | |
77 | * Map cpu index to physical APIC ID | |
78 | */ | |
79 | DEFINE_EARLY_PER_CPU(u16, x86_cpu_to_apicid, BAD_APICID); | |
80 | DEFINE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid, BAD_APICID); | |
81 | EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid); | |
82 | EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid); | |
80e5609c | 83 | |
b3c51170 YL |
84 | #ifdef CONFIG_X86_32 |
85 | /* | |
86 | * Knob to control our willingness to enable the local APIC. | |
87 | * | |
88 | * +1=force-enable | |
89 | */ | |
90 | static int force_enable_local_apic; | |
91 | /* | |
92 | * APIC command line parameters | |
93 | */ | |
94 | static int __init parse_lapic(char *arg) | |
95 | { | |
96 | force_enable_local_apic = 1; | |
97 | return 0; | |
98 | } | |
99 | early_param("lapic", parse_lapic); | |
f28c0ae2 YL |
100 | /* Local APIC was disabled by the BIOS and enabled by the kernel */ |
101 | static int enabled_via_apicbase; | |
102 | ||
c0eaa453 CG |
103 | /* |
104 | * Handle interrupt mode configuration register (IMCR). | |
105 | * This register controls whether the interrupt signals | |
106 | * that reach the BSP come from the master PIC or from the | |
107 | * local APIC. Before entering Symmetric I/O Mode, either | |
108 | * the BIOS or the operating system must switch out of | |
109 | * PIC Mode by changing the IMCR. | |
110 | */ | |
5cda395f | 111 | static inline void imcr_pic_to_apic(void) |
c0eaa453 CG |
112 | { |
113 | /* select IMCR register */ | |
114 | outb(0x70, 0x22); | |
115 | /* NMI and 8259 INTR go through APIC */ | |
116 | outb(0x01, 0x23); | |
117 | } | |
118 | ||
5cda395f | 119 | static inline void imcr_apic_to_pic(void) |
c0eaa453 CG |
120 | { |
121 | /* select IMCR register */ | |
122 | outb(0x70, 0x22); | |
123 | /* NMI and 8259 INTR go directly to BSP */ | |
124 | outb(0x00, 0x23); | |
125 | } | |
b3c51170 YL |
126 | #endif |
127 | ||
128 | #ifdef CONFIG_X86_64 | |
bc1d99c1 | 129 | static int apic_calibrate_pmtmr __initdata; |
b3c51170 YL |
130 | static __init int setup_apicpmtimer(char *s) |
131 | { | |
132 | apic_calibrate_pmtmr = 1; | |
133 | notsc_setup(NULL); | |
134 | return 0; | |
135 | } | |
136 | __setup("apicpmtimer", setup_apicpmtimer); | |
137 | #endif | |
138 | ||
fc1edaf9 | 139 | int x2apic_mode; |
06cd9a7d | 140 | #ifdef CONFIG_X86_X2APIC |
6e1cb38a | 141 | /* x2apic enabled before OS handover */ |
b6b301aa | 142 | static int x2apic_preenabled; |
49899eac YL |
143 | static __init int setup_nox2apic(char *str) |
144 | { | |
39d83a5d SS |
145 | if (x2apic_enabled()) { |
146 | pr_warning("Bios already enabled x2apic, " | |
147 | "can't enforce nox2apic"); | |
148 | return 0; | |
149 | } | |
150 | ||
49899eac YL |
151 | setup_clear_cpu_cap(X86_FEATURE_X2APIC); |
152 | return 0; | |
153 | } | |
154 | early_param("nox2apic", setup_nox2apic); | |
155 | #endif | |
1da177e4 | 156 | |
b3c51170 YL |
157 | unsigned long mp_lapic_addr; |
158 | int disable_apic; | |
159 | /* Disable local APIC timer from the kernel commandline or via dmi quirk */ | |
160 | static int disable_apic_timer __cpuinitdata; | |
e83a5fdc | 161 | /* Local APIC timer works in C2 */ |
2e7c2838 LT |
162 | int local_apic_timer_c2_ok; |
163 | EXPORT_SYMBOL_GPL(local_apic_timer_c2_ok); | |
164 | ||
efa2559f YL |
165 | int first_system_vector = 0xfe; |
166 | ||
e83a5fdc HS |
167 | /* |
168 | * Debug level, exported for io_apic.c | |
169 | */ | |
baa13188 | 170 | unsigned int apic_verbosity; |
e83a5fdc | 171 | |
89c38c28 CG |
172 | int pic_mode; |
173 | ||
bab4b27c AS |
174 | /* Have we found an MP table */ |
175 | int smp_found_config; | |
176 | ||
39928722 AD |
177 | static struct resource lapic_resource = { |
178 | .name = "Local APIC", | |
179 | .flags = IORESOURCE_MEM | IORESOURCE_BUSY, | |
180 | }; | |
181 | ||
d03030e9 TG |
182 | static unsigned int calibration_result; |
183 | ||
ba7eda4c TG |
184 | static int lapic_next_event(unsigned long delta, |
185 | struct clock_event_device *evt); | |
186 | static void lapic_timer_setup(enum clock_event_mode mode, | |
187 | struct clock_event_device *evt); | |
9628937d | 188 | static void lapic_timer_broadcast(const struct cpumask *mask); |
0e078e2f | 189 | static void apic_pm_activate(void); |
ba7eda4c | 190 | |
274cfe59 CG |
191 | /* |
192 | * The local apic timer can be used for any function which is CPU local. | |
193 | */ | |
ba7eda4c TG |
194 | static struct clock_event_device lapic_clockevent = { |
195 | .name = "lapic", | |
196 | .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT | |
197 | | CLOCK_EVT_FEAT_C3STOP | CLOCK_EVT_FEAT_DUMMY, | |
198 | .shift = 32, | |
199 | .set_mode = lapic_timer_setup, | |
200 | .set_next_event = lapic_next_event, | |
201 | .broadcast = lapic_timer_broadcast, | |
202 | .rating = 100, | |
203 | .irq = -1, | |
204 | }; | |
205 | static DEFINE_PER_CPU(struct clock_event_device, lapic_events); | |
206 | ||
d3432896 AK |
207 | static unsigned long apic_phys; |
208 | ||
0e078e2f TG |
209 | /* |
210 | * Get the LAPIC version | |
211 | */ | |
212 | static inline int lapic_get_version(void) | |
ba7eda4c | 213 | { |
0e078e2f | 214 | return GET_APIC_VERSION(apic_read(APIC_LVR)); |
ba7eda4c TG |
215 | } |
216 | ||
0e078e2f | 217 | /* |
9c803869 | 218 | * Check, if the APIC is integrated or a separate chip |
0e078e2f TG |
219 | */ |
220 | static inline int lapic_is_integrated(void) | |
ba7eda4c | 221 | { |
9c803869 | 222 | #ifdef CONFIG_X86_64 |
0e078e2f | 223 | return 1; |
9c803869 CG |
224 | #else |
225 | return APIC_INTEGRATED(lapic_get_version()); | |
226 | #endif | |
ba7eda4c TG |
227 | } |
228 | ||
229 | /* | |
0e078e2f | 230 | * Check, whether this is a modern or a first generation APIC |
ba7eda4c | 231 | */ |
0e078e2f | 232 | static int modern_apic(void) |
ba7eda4c | 233 | { |
0e078e2f TG |
234 | /* AMD systems use old APIC versions, so check the CPU */ |
235 | if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD && | |
236 | boot_cpu_data.x86 >= 0xf) | |
237 | return 1; | |
238 | return lapic_get_version() >= 0x14; | |
ba7eda4c TG |
239 | } |
240 | ||
08306ce6 CG |
241 | /* |
242 | * bare function to substitute write operation | |
243 | * and it's _that_ fast :) | |
244 | */ | |
4797f6b0 | 245 | static void native_apic_write_dummy(u32 reg, u32 v) |
08306ce6 CG |
246 | { |
247 | WARN_ON_ONCE((cpu_has_apic || !disable_apic)); | |
248 | } | |
249 | ||
4797f6b0 YL |
250 | static u32 native_apic_read_dummy(u32 reg) |
251 | { | |
103428e5 | 252 | WARN_ON_ONCE((cpu_has_apic && !disable_apic)); |
4797f6b0 YL |
253 | return 0; |
254 | } | |
255 | ||
08306ce6 | 256 | /* |
4797f6b0 | 257 | * right after this call apic->write/read doesn't do anything |
08306ce6 CG |
258 | * note that there is no restore operation it works one way |
259 | */ | |
260 | void apic_disable(void) | |
261 | { | |
4797f6b0 | 262 | apic->read = native_apic_read_dummy; |
08306ce6 CG |
263 | apic->write = native_apic_write_dummy; |
264 | } | |
265 | ||
c1eeb2de | 266 | void native_apic_wait_icr_idle(void) |
8339e9fb FLV |
267 | { |
268 | while (apic_read(APIC_ICR) & APIC_ICR_BUSY) | |
269 | cpu_relax(); | |
270 | } | |
271 | ||
c1eeb2de | 272 | u32 native_safe_apic_wait_icr_idle(void) |
8339e9fb | 273 | { |
3c6bb07a | 274 | u32 send_status; |
8339e9fb FLV |
275 | int timeout; |
276 | ||
277 | timeout = 0; | |
278 | do { | |
279 | send_status = apic_read(APIC_ICR) & APIC_ICR_BUSY; | |
280 | if (!send_status) | |
281 | break; | |
282 | udelay(100); | |
283 | } while (timeout++ < 1000); | |
284 | ||
285 | return send_status; | |
286 | } | |
287 | ||
c1eeb2de | 288 | void native_apic_icr_write(u32 low, u32 id) |
1b374e4d | 289 | { |
ed4e5ec1 | 290 | apic_write(APIC_ICR2, SET_APIC_DEST_FIELD(id)); |
1b374e4d SS |
291 | apic_write(APIC_ICR, low); |
292 | } | |
293 | ||
c1eeb2de | 294 | u64 native_apic_icr_read(void) |
1b374e4d SS |
295 | { |
296 | u32 icr1, icr2; | |
297 | ||
298 | icr2 = apic_read(APIC_ICR2); | |
299 | icr1 = apic_read(APIC_ICR); | |
300 | ||
cf9768d7 | 301 | return icr1 | ((u64)icr2 << 32); |
1b374e4d SS |
302 | } |
303 | ||
0e078e2f TG |
304 | /** |
305 | * enable_NMI_through_LVT0 - enable NMI through local vector table 0 | |
306 | */ | |
e9427101 | 307 | void __cpuinit enable_NMI_through_LVT0(void) |
1da177e4 | 308 | { |
11a8e778 | 309 | unsigned int v; |
6935d1f9 TG |
310 | |
311 | /* unmask and set to NMI */ | |
312 | v = APIC_DM_NMI; | |
d4c63ec0 CG |
313 | |
314 | /* Level triggered for 82489DX (32bit mode) */ | |
315 | if (!lapic_is_integrated()) | |
316 | v |= APIC_LVT_LEVEL_TRIGGER; | |
317 | ||
11a8e778 | 318 | apic_write(APIC_LVT0, v); |
1da177e4 LT |
319 | } |
320 | ||
7c37e48b CG |
321 | #ifdef CONFIG_X86_32 |
322 | /** | |
323 | * get_physical_broadcast - Get number of physical broadcast IDs | |
324 | */ | |
325 | int get_physical_broadcast(void) | |
326 | { | |
327 | return modern_apic() ? 0xff : 0xf; | |
328 | } | |
329 | #endif | |
330 | ||
0e078e2f TG |
331 | /** |
332 | * lapic_get_maxlvt - get the maximum number of local vector table entries | |
333 | */ | |
37e650c7 | 334 | int lapic_get_maxlvt(void) |
1da177e4 | 335 | { |
36a028de | 336 | unsigned int v; |
1da177e4 LT |
337 | |
338 | v = apic_read(APIC_LVR); | |
36a028de CG |
339 | /* |
340 | * - we always have APIC integrated on 64bit mode | |
341 | * - 82489DXs do not report # of LVT entries | |
342 | */ | |
343 | return APIC_INTEGRATED(GET_APIC_VERSION(v)) ? GET_APIC_MAXLVT(v) : 2; | |
1da177e4 LT |
344 | } |
345 | ||
274cfe59 CG |
346 | /* |
347 | * Local APIC timer | |
348 | */ | |
349 | ||
c40aaec6 | 350 | /* Clock divisor */ |
c40aaec6 | 351 | #define APIC_DIVISOR 16 |
f07f4f90 | 352 | |
0e078e2f TG |
353 | /* |
354 | * This function sets up the local APIC timer, with a timeout of | |
355 | * 'clocks' APIC bus clock. During calibration we actually call | |
356 | * this function twice on the boot CPU, once with a bogus timeout | |
357 | * value, second time for real. The other (noncalibrating) CPUs | |
358 | * call this function only once, with the real, calibrated value. | |
359 | * | |
360 | * We do reads before writes even if unnecessary, to get around the | |
361 | * P5 APIC double write bug. | |
362 | */ | |
0e078e2f | 363 | static void __setup_APIC_LVTT(unsigned int clocks, int oneshot, int irqen) |
1da177e4 | 364 | { |
0e078e2f | 365 | unsigned int lvtt_value, tmp_value; |
1da177e4 | 366 | |
0e078e2f TG |
367 | lvtt_value = LOCAL_TIMER_VECTOR; |
368 | if (!oneshot) | |
369 | lvtt_value |= APIC_LVT_TIMER_PERIODIC; | |
f07f4f90 CG |
370 | if (!lapic_is_integrated()) |
371 | lvtt_value |= SET_APIC_TIMER_BASE(APIC_TIMER_BASE_DIV); | |
372 | ||
0e078e2f TG |
373 | if (!irqen) |
374 | lvtt_value |= APIC_LVT_MASKED; | |
1da177e4 | 375 | |
0e078e2f | 376 | apic_write(APIC_LVTT, lvtt_value); |
1da177e4 LT |
377 | |
378 | /* | |
0e078e2f | 379 | * Divide PICLK by 16 |
1da177e4 | 380 | */ |
0e078e2f | 381 | tmp_value = apic_read(APIC_TDCR); |
c40aaec6 CG |
382 | apic_write(APIC_TDCR, |
383 | (tmp_value & ~(APIC_TDR_DIV_1 | APIC_TDR_DIV_TMBASE)) | | |
384 | APIC_TDR_DIV_16); | |
0e078e2f TG |
385 | |
386 | if (!oneshot) | |
f07f4f90 | 387 | apic_write(APIC_TMICT, clocks / APIC_DIVISOR); |
1da177e4 LT |
388 | } |
389 | ||
0e078e2f | 390 | /* |
7b83dae7 RR |
391 | * Setup extended LVT, AMD specific (K8, family 10h) |
392 | * | |
393 | * Vector mappings are hard coded. On K8 only offset 0 (APIC500) and | |
394 | * MCE interrupts are supported. Thus MCE offset must be set to 0. | |
286f5718 RR |
395 | * |
396 | * If mask=1, the LVT entry does not generate interrupts while mask=0 | |
397 | * enables the vector. See also the BKDGs. | |
0e078e2f | 398 | */ |
7b83dae7 RR |
399 | |
400 | #define APIC_EILVT_LVTOFF_MCE 0 | |
401 | #define APIC_EILVT_LVTOFF_IBS 1 | |
402 | ||
403 | static void setup_APIC_eilvt(u8 lvt_off, u8 vector, u8 msg_type, u8 mask) | |
1da177e4 | 404 | { |
97a52714 | 405 | unsigned long reg = (lvt_off << 4) + APIC_EILVTn(0); |
0e078e2f | 406 | unsigned int v = (mask << 16) | (msg_type << 8) | vector; |
a8fcf1a2 | 407 | |
0e078e2f | 408 | apic_write(reg, v); |
1da177e4 LT |
409 | } |
410 | ||
7b83dae7 RR |
411 | u8 setup_APIC_eilvt_mce(u8 vector, u8 msg_type, u8 mask) |
412 | { | |
413 | setup_APIC_eilvt(APIC_EILVT_LVTOFF_MCE, vector, msg_type, mask); | |
414 | return APIC_EILVT_LVTOFF_MCE; | |
415 | } | |
416 | ||
417 | u8 setup_APIC_eilvt_ibs(u8 vector, u8 msg_type, u8 mask) | |
418 | { | |
419 | setup_APIC_eilvt(APIC_EILVT_LVTOFF_IBS, vector, msg_type, mask); | |
420 | return APIC_EILVT_LVTOFF_IBS; | |
421 | } | |
6aa360e6 | 422 | EXPORT_SYMBOL_GPL(setup_APIC_eilvt_ibs); |
7b83dae7 | 423 | |
0e078e2f TG |
424 | /* |
425 | * Program the next event, relative to now | |
426 | */ | |
427 | static int lapic_next_event(unsigned long delta, | |
428 | struct clock_event_device *evt) | |
1da177e4 | 429 | { |
0e078e2f TG |
430 | apic_write(APIC_TMICT, delta); |
431 | return 0; | |
1da177e4 LT |
432 | } |
433 | ||
0e078e2f TG |
434 | /* |
435 | * Setup the lapic timer in periodic or oneshot mode | |
436 | */ | |
437 | static void lapic_timer_setup(enum clock_event_mode mode, | |
438 | struct clock_event_device *evt) | |
9b7711f0 HS |
439 | { |
440 | unsigned long flags; | |
0e078e2f | 441 | unsigned int v; |
9b7711f0 | 442 | |
0e078e2f TG |
443 | /* Lapic used as dummy for broadcast ? */ |
444 | if (evt->features & CLOCK_EVT_FEAT_DUMMY) | |
9b7711f0 HS |
445 | return; |
446 | ||
447 | local_irq_save(flags); | |
448 | ||
0e078e2f TG |
449 | switch (mode) { |
450 | case CLOCK_EVT_MODE_PERIODIC: | |
451 | case CLOCK_EVT_MODE_ONESHOT: | |
452 | __setup_APIC_LVTT(calibration_result, | |
453 | mode != CLOCK_EVT_MODE_PERIODIC, 1); | |
454 | break; | |
455 | case CLOCK_EVT_MODE_UNUSED: | |
456 | case CLOCK_EVT_MODE_SHUTDOWN: | |
457 | v = apic_read(APIC_LVTT); | |
458 | v |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR); | |
459 | apic_write(APIC_LVTT, v); | |
a98f8fd2 | 460 | apic_write(APIC_TMICT, 0xffffffff); |
0e078e2f TG |
461 | break; |
462 | case CLOCK_EVT_MODE_RESUME: | |
463 | /* Nothing to do here */ | |
464 | break; | |
465 | } | |
9b7711f0 HS |
466 | |
467 | local_irq_restore(flags); | |
468 | } | |
469 | ||
1da177e4 | 470 | /* |
0e078e2f | 471 | * Local APIC timer broadcast function |
1da177e4 | 472 | */ |
9628937d | 473 | static void lapic_timer_broadcast(const struct cpumask *mask) |
1da177e4 | 474 | { |
0e078e2f | 475 | #ifdef CONFIG_SMP |
dac5f412 | 476 | apic->send_IPI_mask(mask, LOCAL_TIMER_VECTOR); |
0e078e2f TG |
477 | #endif |
478 | } | |
1da177e4 | 479 | |
0e078e2f TG |
480 | /* |
481 | * Setup the local APIC timer for this CPU. Copy the initilized values | |
482 | * of the boot CPU and register the clock event in the framework. | |
483 | */ | |
db4b5525 | 484 | static void __cpuinit setup_APIC_timer(void) |
0e078e2f TG |
485 | { |
486 | struct clock_event_device *levt = &__get_cpu_var(lapic_events); | |
1da177e4 | 487 | |
db954b58 VP |
488 | if (cpu_has(¤t_cpu_data, X86_FEATURE_ARAT)) { |
489 | lapic_clockevent.features &= ~CLOCK_EVT_FEAT_C3STOP; | |
490 | /* Make LAPIC timer preferrable over percpu HPET */ | |
491 | lapic_clockevent.rating = 150; | |
492 | } | |
493 | ||
0e078e2f | 494 | memcpy(levt, &lapic_clockevent, sizeof(*levt)); |
320ab2b0 | 495 | levt->cpumask = cpumask_of(smp_processor_id()); |
1da177e4 | 496 | |
0e078e2f TG |
497 | clockevents_register_device(levt); |
498 | } | |
1da177e4 | 499 | |
2f04fa88 YL |
500 | /* |
501 | * In this functions we calibrate APIC bus clocks to the external timer. | |
502 | * | |
503 | * We want to do the calibration only once since we want to have local timer | |
504 | * irqs syncron. CPUs connected by the same APIC bus have the very same bus | |
505 | * frequency. | |
506 | * | |
507 | * This was previously done by reading the PIT/HPET and waiting for a wrap | |
508 | * around to find out, that a tick has elapsed. I have a box, where the PIT | |
509 | * readout is broken, so it never gets out of the wait loop again. This was | |
510 | * also reported by others. | |
511 | * | |
512 | * Monitoring the jiffies value is inaccurate and the clockevents | |
513 | * infrastructure allows us to do a simple substitution of the interrupt | |
514 | * handler. | |
515 | * | |
516 | * The calibration routine also uses the pm_timer when possible, as the PIT | |
517 | * happens to run way too slow (factor 2.3 on my VAIO CoreDuo, which goes | |
518 | * back to normal later in the boot process). | |
519 | */ | |
520 | ||
521 | #define LAPIC_CAL_LOOPS (HZ/10) | |
522 | ||
523 | static __initdata int lapic_cal_loops = -1; | |
524 | static __initdata long lapic_cal_t1, lapic_cal_t2; | |
525 | static __initdata unsigned long long lapic_cal_tsc1, lapic_cal_tsc2; | |
526 | static __initdata unsigned long lapic_cal_pm1, lapic_cal_pm2; | |
527 | static __initdata unsigned long lapic_cal_j1, lapic_cal_j2; | |
528 | ||
529 | /* | |
530 | * Temporary interrupt handler. | |
531 | */ | |
532 | static void __init lapic_cal_handler(struct clock_event_device *dev) | |
533 | { | |
534 | unsigned long long tsc = 0; | |
535 | long tapic = apic_read(APIC_TMCCT); | |
536 | unsigned long pm = acpi_pm_read_early(); | |
537 | ||
538 | if (cpu_has_tsc) | |
539 | rdtscll(tsc); | |
540 | ||
541 | switch (lapic_cal_loops++) { | |
542 | case 0: | |
543 | lapic_cal_t1 = tapic; | |
544 | lapic_cal_tsc1 = tsc; | |
545 | lapic_cal_pm1 = pm; | |
546 | lapic_cal_j1 = jiffies; | |
547 | break; | |
548 | ||
549 | case LAPIC_CAL_LOOPS: | |
550 | lapic_cal_t2 = tapic; | |
551 | lapic_cal_tsc2 = tsc; | |
552 | if (pm < lapic_cal_pm1) | |
553 | pm += ACPI_PM_OVRRUN; | |
554 | lapic_cal_pm2 = pm; | |
555 | lapic_cal_j2 = jiffies; | |
556 | break; | |
557 | } | |
558 | } | |
559 | ||
754ef0cd YI |
560 | static int __init |
561 | calibrate_by_pmtimer(long deltapm, long *delta, long *deltatsc) | |
b189892d CG |
562 | { |
563 | const long pm_100ms = PMTMR_TICKS_PER_SEC / 10; | |
564 | const long pm_thresh = pm_100ms / 100; | |
565 | unsigned long mult; | |
566 | u64 res; | |
567 | ||
568 | #ifndef CONFIG_X86_PM_TIMER | |
569 | return -1; | |
570 | #endif | |
571 | ||
39ba5d43 | 572 | apic_printk(APIC_VERBOSE, "... PM-Timer delta = %ld\n", deltapm); |
b189892d CG |
573 | |
574 | /* Check, if the PM timer is available */ | |
575 | if (!deltapm) | |
576 | return -1; | |
577 | ||
578 | mult = clocksource_hz2mult(PMTMR_TICKS_PER_SEC, 22); | |
579 | ||
580 | if (deltapm > (pm_100ms - pm_thresh) && | |
581 | deltapm < (pm_100ms + pm_thresh)) { | |
39ba5d43 | 582 | apic_printk(APIC_VERBOSE, "... PM-Timer result ok\n"); |
754ef0cd YI |
583 | return 0; |
584 | } | |
585 | ||
586 | res = (((u64)deltapm) * mult) >> 22; | |
587 | do_div(res, 1000000); | |
588 | pr_warning("APIC calibration not consistent " | |
39ba5d43 | 589 | "with PM-Timer: %ldms instead of 100ms\n",(long)res); |
754ef0cd YI |
590 | |
591 | /* Correct the lapic counter value */ | |
592 | res = (((u64)(*delta)) * pm_100ms); | |
593 | do_div(res, deltapm); | |
594 | pr_info("APIC delta adjusted to PM-Timer: " | |
595 | "%lu (%ld)\n", (unsigned long)res, *delta); | |
596 | *delta = (long)res; | |
597 | ||
598 | /* Correct the tsc counter value */ | |
599 | if (cpu_has_tsc) { | |
600 | res = (((u64)(*deltatsc)) * pm_100ms); | |
b189892d | 601 | do_div(res, deltapm); |
754ef0cd YI |
602 | apic_printk(APIC_VERBOSE, "TSC delta adjusted to " |
603 | "PM-Timer: %lu (%ld) \n", | |
604 | (unsigned long)res, *deltatsc); | |
605 | *deltatsc = (long)res; | |
b189892d CG |
606 | } |
607 | ||
608 | return 0; | |
609 | } | |
610 | ||
2f04fa88 YL |
611 | static int __init calibrate_APIC_clock(void) |
612 | { | |
613 | struct clock_event_device *levt = &__get_cpu_var(lapic_events); | |
2f04fa88 YL |
614 | void (*real_handler)(struct clock_event_device *dev); |
615 | unsigned long deltaj; | |
754ef0cd | 616 | long delta, deltatsc; |
2f04fa88 YL |
617 | int pm_referenced = 0; |
618 | ||
619 | local_irq_disable(); | |
620 | ||
621 | /* Replace the global interrupt handler */ | |
622 | real_handler = global_clock_event->event_handler; | |
623 | global_clock_event->event_handler = lapic_cal_handler; | |
624 | ||
625 | /* | |
81608f3c | 626 | * Setup the APIC counter to maximum. There is no way the lapic |
2f04fa88 YL |
627 | * can underflow in the 100ms detection time frame |
628 | */ | |
81608f3c | 629 | __setup_APIC_LVTT(0xffffffff, 0, 0); |
2f04fa88 YL |
630 | |
631 | /* Let the interrupts run */ | |
632 | local_irq_enable(); | |
633 | ||
634 | while (lapic_cal_loops <= LAPIC_CAL_LOOPS) | |
635 | cpu_relax(); | |
636 | ||
637 | local_irq_disable(); | |
638 | ||
639 | /* Restore the real event handler */ | |
640 | global_clock_event->event_handler = real_handler; | |
641 | ||
642 | /* Build delta t1-t2 as apic timer counts down */ | |
643 | delta = lapic_cal_t1 - lapic_cal_t2; | |
644 | apic_printk(APIC_VERBOSE, "... lapic delta = %ld\n", delta); | |
645 | ||
754ef0cd YI |
646 | deltatsc = (long)(lapic_cal_tsc2 - lapic_cal_tsc1); |
647 | ||
b189892d CG |
648 | /* we trust the PM based calibration if possible */ |
649 | pm_referenced = !calibrate_by_pmtimer(lapic_cal_pm2 - lapic_cal_pm1, | |
754ef0cd | 650 | &delta, &deltatsc); |
2f04fa88 YL |
651 | |
652 | /* Calculate the scaled math multiplication factor */ | |
653 | lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS, | |
654 | lapic_clockevent.shift); | |
655 | lapic_clockevent.max_delta_ns = | |
656 | clockevent_delta2ns(0x7FFFFF, &lapic_clockevent); | |
657 | lapic_clockevent.min_delta_ns = | |
658 | clockevent_delta2ns(0xF, &lapic_clockevent); | |
659 | ||
660 | calibration_result = (delta * APIC_DIVISOR) / LAPIC_CAL_LOOPS; | |
661 | ||
662 | apic_printk(APIC_VERBOSE, "..... delta %ld\n", delta); | |
663 | apic_printk(APIC_VERBOSE, "..... mult: %ld\n", lapic_clockevent.mult); | |
664 | apic_printk(APIC_VERBOSE, "..... calibration result: %u\n", | |
665 | calibration_result); | |
666 | ||
667 | if (cpu_has_tsc) { | |
2f04fa88 YL |
668 | apic_printk(APIC_VERBOSE, "..... CPU clock speed is " |
669 | "%ld.%04ld MHz.\n", | |
754ef0cd YI |
670 | (deltatsc / LAPIC_CAL_LOOPS) / (1000000 / HZ), |
671 | (deltatsc / LAPIC_CAL_LOOPS) % (1000000 / HZ)); | |
2f04fa88 YL |
672 | } |
673 | ||
674 | apic_printk(APIC_VERBOSE, "..... host bus clock speed is " | |
675 | "%u.%04u MHz.\n", | |
676 | calibration_result / (1000000 / HZ), | |
677 | calibration_result % (1000000 / HZ)); | |
678 | ||
679 | /* | |
680 | * Do a sanity check on the APIC calibration result | |
681 | */ | |
682 | if (calibration_result < (1000000 / HZ)) { | |
683 | local_irq_enable(); | |
ba21ebb6 | 684 | pr_warning("APIC frequency too slow, disabling apic timer\n"); |
2f04fa88 YL |
685 | return -1; |
686 | } | |
687 | ||
688 | levt->features &= ~CLOCK_EVT_FEAT_DUMMY; | |
689 | ||
b189892d CG |
690 | /* |
691 | * PM timer calibration failed or not turned on | |
692 | * so lets try APIC timer based calibration | |
693 | */ | |
2f04fa88 YL |
694 | if (!pm_referenced) { |
695 | apic_printk(APIC_VERBOSE, "... verify APIC timer\n"); | |
696 | ||
697 | /* | |
698 | * Setup the apic timer manually | |
699 | */ | |
700 | levt->event_handler = lapic_cal_handler; | |
701 | lapic_timer_setup(CLOCK_EVT_MODE_PERIODIC, levt); | |
702 | lapic_cal_loops = -1; | |
703 | ||
704 | /* Let the interrupts run */ | |
705 | local_irq_enable(); | |
706 | ||
707 | while (lapic_cal_loops <= LAPIC_CAL_LOOPS) | |
708 | cpu_relax(); | |
709 | ||
2f04fa88 YL |
710 | /* Stop the lapic timer */ |
711 | lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, levt); | |
712 | ||
2f04fa88 YL |
713 | /* Jiffies delta */ |
714 | deltaj = lapic_cal_j2 - lapic_cal_j1; | |
715 | apic_printk(APIC_VERBOSE, "... jiffies delta = %lu\n", deltaj); | |
716 | ||
717 | /* Check, if the jiffies result is consistent */ | |
718 | if (deltaj >= LAPIC_CAL_LOOPS-2 && deltaj <= LAPIC_CAL_LOOPS+2) | |
719 | apic_printk(APIC_VERBOSE, "... jiffies result ok\n"); | |
720 | else | |
721 | levt->features |= CLOCK_EVT_FEAT_DUMMY; | |
722 | } else | |
723 | local_irq_enable(); | |
724 | ||
725 | if (levt->features & CLOCK_EVT_FEAT_DUMMY) { | |
e423e33e | 726 | pr_warning("APIC timer disabled due to verification failure\n"); |
2f04fa88 YL |
727 | return -1; |
728 | } | |
729 | ||
730 | return 0; | |
731 | } | |
732 | ||
e83a5fdc HS |
733 | /* |
734 | * Setup the boot APIC | |
735 | * | |
736 | * Calibrate and verify the result. | |
737 | */ | |
0e078e2f TG |
738 | void __init setup_boot_APIC_clock(void) |
739 | { | |
740 | /* | |
274cfe59 CG |
741 | * The local apic timer can be disabled via the kernel |
742 | * commandline or from the CPU detection code. Register the lapic | |
743 | * timer as a dummy clock event source on SMP systems, so the | |
744 | * broadcast mechanism is used. On UP systems simply ignore it. | |
0e078e2f TG |
745 | */ |
746 | if (disable_apic_timer) { | |
ba21ebb6 | 747 | pr_info("Disabling APIC timer\n"); |
0e078e2f | 748 | /* No broadcast on UP ! */ |
9d09951d TG |
749 | if (num_possible_cpus() > 1) { |
750 | lapic_clockevent.mult = 1; | |
0e078e2f | 751 | setup_APIC_timer(); |
9d09951d | 752 | } |
0e078e2f TG |
753 | return; |
754 | } | |
755 | ||
274cfe59 CG |
756 | apic_printk(APIC_VERBOSE, "Using local APIC timer interrupts.\n" |
757 | "calibrating APIC timer ...\n"); | |
758 | ||
89b3b1f4 | 759 | if (calibrate_APIC_clock()) { |
c2b84b30 TG |
760 | /* No broadcast on UP ! */ |
761 | if (num_possible_cpus() > 1) | |
762 | setup_APIC_timer(); | |
763 | return; | |
764 | } | |
765 | ||
0e078e2f TG |
766 | /* |
767 | * If nmi_watchdog is set to IO_APIC, we need the | |
768 | * PIT/HPET going. Otherwise register lapic as a dummy | |
769 | * device. | |
770 | */ | |
771 | if (nmi_watchdog != NMI_IO_APIC) | |
772 | lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY; | |
773 | else | |
ba21ebb6 | 774 | pr_warning("APIC timer registered as dummy," |
116f570e | 775 | " due to nmi_watchdog=%d!\n", nmi_watchdog); |
0e078e2f | 776 | |
274cfe59 | 777 | /* Setup the lapic or request the broadcast */ |
0e078e2f TG |
778 | setup_APIC_timer(); |
779 | } | |
780 | ||
0e078e2f TG |
781 | void __cpuinit setup_secondary_APIC_clock(void) |
782 | { | |
0e078e2f TG |
783 | setup_APIC_timer(); |
784 | } | |
785 | ||
786 | /* | |
787 | * The guts of the apic timer interrupt | |
788 | */ | |
789 | static void local_apic_timer_interrupt(void) | |
790 | { | |
791 | int cpu = smp_processor_id(); | |
792 | struct clock_event_device *evt = &per_cpu(lapic_events, cpu); | |
793 | ||
794 | /* | |
795 | * Normally we should not be here till LAPIC has been initialized but | |
796 | * in some cases like kdump, its possible that there is a pending LAPIC | |
797 | * timer interrupt from previous kernel's context and is delivered in | |
798 | * new kernel the moment interrupts are enabled. | |
799 | * | |
800 | * Interrupts are enabled early and LAPIC is setup much later, hence | |
801 | * its possible that when we get here evt->event_handler is NULL. | |
802 | * Check for event_handler being NULL and discard the interrupt as | |
803 | * spurious. | |
804 | */ | |
805 | if (!evt->event_handler) { | |
ba21ebb6 | 806 | pr_warning("Spurious LAPIC timer interrupt on cpu %d\n", cpu); |
0e078e2f TG |
807 | /* Switch it off */ |
808 | lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, evt); | |
809 | return; | |
810 | } | |
811 | ||
812 | /* | |
813 | * the NMI deadlock-detector uses this. | |
814 | */ | |
915b0d01 | 815 | inc_irq_stat(apic_timer_irqs); |
0e078e2f TG |
816 | |
817 | evt->event_handler(evt); | |
818 | } | |
819 | ||
820 | /* | |
821 | * Local APIC timer interrupt. This is the most natural way for doing | |
822 | * local interrupts, but local timer interrupts can be emulated by | |
823 | * broadcast interrupts too. [in case the hw doesn't support APIC timers] | |
824 | * | |
825 | * [ if a single-CPU system runs an SMP kernel then we call the local | |
826 | * interrupt as well. Thus we cannot inline the local irq ... ] | |
827 | */ | |
bcbc4f20 | 828 | void __irq_entry smp_apic_timer_interrupt(struct pt_regs *regs) |
0e078e2f TG |
829 | { |
830 | struct pt_regs *old_regs = set_irq_regs(regs); | |
831 | ||
832 | /* | |
833 | * NOTE! We'd better ACK the irq immediately, | |
834 | * because timer handling can be slow. | |
835 | */ | |
836 | ack_APIC_irq(); | |
837 | /* | |
838 | * update_process_times() expects us to have done irq_enter(). | |
839 | * Besides, if we don't timer interrupts ignore the global | |
840 | * interrupt lock, which is the WrongThing (tm) to do. | |
841 | */ | |
842 | exit_idle(); | |
843 | irq_enter(); | |
844 | local_apic_timer_interrupt(); | |
845 | irq_exit(); | |
274cfe59 | 846 | |
0e078e2f TG |
847 | set_irq_regs(old_regs); |
848 | } | |
849 | ||
850 | int setup_profiling_timer(unsigned int multiplier) | |
851 | { | |
852 | return -EINVAL; | |
853 | } | |
854 | ||
0e078e2f TG |
855 | /* |
856 | * Local APIC start and shutdown | |
857 | */ | |
858 | ||
859 | /** | |
860 | * clear_local_APIC - shutdown the local APIC | |
861 | * | |
862 | * This is called, when a CPU is disabled and before rebooting, so the state of | |
863 | * the local APIC has no dangling leftovers. Also used to cleanout any BIOS | |
864 | * leftovers during boot. | |
865 | */ | |
866 | void clear_local_APIC(void) | |
867 | { | |
2584a82d | 868 | int maxlvt; |
0e078e2f TG |
869 | u32 v; |
870 | ||
d3432896 | 871 | /* APIC hasn't been mapped yet */ |
fc1edaf9 | 872 | if (!x2apic_mode && !apic_phys) |
d3432896 AK |
873 | return; |
874 | ||
875 | maxlvt = lapic_get_maxlvt(); | |
0e078e2f TG |
876 | /* |
877 | * Masking an LVT entry can trigger a local APIC error | |
878 | * if the vector is zero. Mask LVTERR first to prevent this. | |
879 | */ | |
880 | if (maxlvt >= 3) { | |
881 | v = ERROR_APIC_VECTOR; /* any non-zero vector will do */ | |
882 | apic_write(APIC_LVTERR, v | APIC_LVT_MASKED); | |
883 | } | |
884 | /* | |
885 | * Careful: we have to set masks only first to deassert | |
886 | * any level-triggered sources. | |
887 | */ | |
888 | v = apic_read(APIC_LVTT); | |
889 | apic_write(APIC_LVTT, v | APIC_LVT_MASKED); | |
890 | v = apic_read(APIC_LVT0); | |
891 | apic_write(APIC_LVT0, v | APIC_LVT_MASKED); | |
892 | v = apic_read(APIC_LVT1); | |
893 | apic_write(APIC_LVT1, v | APIC_LVT_MASKED); | |
894 | if (maxlvt >= 4) { | |
895 | v = apic_read(APIC_LVTPC); | |
896 | apic_write(APIC_LVTPC, v | APIC_LVT_MASKED); | |
897 | } | |
898 | ||
6764014b | 899 | /* lets not touch this if we didn't frob it */ |
4efc0670 | 900 | #ifdef CONFIG_X86_THERMAL_VECTOR |
6764014b CG |
901 | if (maxlvt >= 5) { |
902 | v = apic_read(APIC_LVTTHMR); | |
903 | apic_write(APIC_LVTTHMR, v | APIC_LVT_MASKED); | |
904 | } | |
905 | #endif | |
5ca8681c AK |
906 | #ifdef CONFIG_X86_MCE_INTEL |
907 | if (maxlvt >= 6) { | |
908 | v = apic_read(APIC_LVTCMCI); | |
909 | if (!(v & APIC_LVT_MASKED)) | |
910 | apic_write(APIC_LVTCMCI, v | APIC_LVT_MASKED); | |
911 | } | |
912 | #endif | |
913 | ||
0e078e2f TG |
914 | /* |
915 | * Clean APIC state for other OSs: | |
916 | */ | |
917 | apic_write(APIC_LVTT, APIC_LVT_MASKED); | |
918 | apic_write(APIC_LVT0, APIC_LVT_MASKED); | |
919 | apic_write(APIC_LVT1, APIC_LVT_MASKED); | |
920 | if (maxlvt >= 3) | |
921 | apic_write(APIC_LVTERR, APIC_LVT_MASKED); | |
922 | if (maxlvt >= 4) | |
923 | apic_write(APIC_LVTPC, APIC_LVT_MASKED); | |
6764014b CG |
924 | |
925 | /* Integrated APIC (!82489DX) ? */ | |
926 | if (lapic_is_integrated()) { | |
927 | if (maxlvt > 3) | |
928 | /* Clear ESR due to Pentium errata 3AP and 11AP */ | |
929 | apic_write(APIC_ESR, 0); | |
930 | apic_read(APIC_ESR); | |
931 | } | |
0e078e2f TG |
932 | } |
933 | ||
934 | /** | |
935 | * disable_local_APIC - clear and disable the local APIC | |
936 | */ | |
937 | void disable_local_APIC(void) | |
938 | { | |
939 | unsigned int value; | |
940 | ||
4a13ad0b JB |
941 | /* APIC hasn't been mapped yet */ |
942 | if (!apic_phys) | |
943 | return; | |
944 | ||
0e078e2f TG |
945 | clear_local_APIC(); |
946 | ||
947 | /* | |
948 | * Disable APIC (implies clearing of registers | |
949 | * for 82489DX!). | |
950 | */ | |
951 | value = apic_read(APIC_SPIV); | |
952 | value &= ~APIC_SPIV_APIC_ENABLED; | |
953 | apic_write(APIC_SPIV, value); | |
990b183e CG |
954 | |
955 | #ifdef CONFIG_X86_32 | |
956 | /* | |
957 | * When LAPIC was disabled by the BIOS and enabled by the kernel, | |
958 | * restore the disabled state. | |
959 | */ | |
960 | if (enabled_via_apicbase) { | |
961 | unsigned int l, h; | |
962 | ||
963 | rdmsr(MSR_IA32_APICBASE, l, h); | |
964 | l &= ~MSR_IA32_APICBASE_ENABLE; | |
965 | wrmsr(MSR_IA32_APICBASE, l, h); | |
966 | } | |
967 | #endif | |
0e078e2f TG |
968 | } |
969 | ||
fe4024dc CG |
970 | /* |
971 | * If Linux enabled the LAPIC against the BIOS default disable it down before | |
972 | * re-entering the BIOS on shutdown. Otherwise the BIOS may get confused and | |
973 | * not power-off. Additionally clear all LVT entries before disable_local_APIC | |
974 | * for the case where Linux didn't enable the LAPIC. | |
975 | */ | |
0e078e2f TG |
976 | void lapic_shutdown(void) |
977 | { | |
978 | unsigned long flags; | |
979 | ||
980 | if (!cpu_has_apic) | |
981 | return; | |
982 | ||
983 | local_irq_save(flags); | |
984 | ||
fe4024dc CG |
985 | #ifdef CONFIG_X86_32 |
986 | if (!enabled_via_apicbase) | |
987 | clear_local_APIC(); | |
988 | else | |
989 | #endif | |
990 | disable_local_APIC(); | |
991 | ||
0e078e2f TG |
992 | |
993 | local_irq_restore(flags); | |
994 | } | |
995 | ||
996 | /* | |
997 | * This is to verify that we're looking at a real local APIC. | |
998 | * Check these against your board if the CPUs aren't getting | |
999 | * started for no apparent reason. | |
1000 | */ | |
1001 | int __init verify_local_APIC(void) | |
1002 | { | |
1003 | unsigned int reg0, reg1; | |
1004 | ||
1005 | /* | |
1006 | * The version register is read-only in a real APIC. | |
1007 | */ | |
1008 | reg0 = apic_read(APIC_LVR); | |
1009 | apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg0); | |
1010 | apic_write(APIC_LVR, reg0 ^ APIC_LVR_MASK); | |
1011 | reg1 = apic_read(APIC_LVR); | |
1012 | apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg1); | |
1013 | ||
1014 | /* | |
1015 | * The two version reads above should print the same | |
1016 | * numbers. If the second one is different, then we | |
1017 | * poke at a non-APIC. | |
1018 | */ | |
1019 | if (reg1 != reg0) | |
1020 | return 0; | |
1021 | ||
1022 | /* | |
1023 | * Check if the version looks reasonably. | |
1024 | */ | |
1025 | reg1 = GET_APIC_VERSION(reg0); | |
1026 | if (reg1 == 0x00 || reg1 == 0xff) | |
1027 | return 0; | |
1028 | reg1 = lapic_get_maxlvt(); | |
1029 | if (reg1 < 0x02 || reg1 == 0xff) | |
1030 | return 0; | |
1031 | ||
1032 | /* | |
1033 | * The ID register is read/write in a real APIC. | |
1034 | */ | |
2d7a66d0 | 1035 | reg0 = apic_read(APIC_ID); |
0e078e2f | 1036 | apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg0); |
5b812727 | 1037 | apic_write(APIC_ID, reg0 ^ apic->apic_id_mask); |
2d7a66d0 | 1038 | reg1 = apic_read(APIC_ID); |
0e078e2f TG |
1039 | apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg1); |
1040 | apic_write(APIC_ID, reg0); | |
5b812727 | 1041 | if (reg1 != (reg0 ^ apic->apic_id_mask)) |
0e078e2f TG |
1042 | return 0; |
1043 | ||
1044 | /* | |
1da177e4 LT |
1045 | * The next two are just to see if we have sane values. |
1046 | * They're only really relevant if we're in Virtual Wire | |
1047 | * compatibility mode, but most boxes are anymore. | |
1048 | */ | |
1049 | reg0 = apic_read(APIC_LVT0); | |
0e078e2f | 1050 | apic_printk(APIC_DEBUG, "Getting LVT0: %x\n", reg0); |
1da177e4 LT |
1051 | reg1 = apic_read(APIC_LVT1); |
1052 | apic_printk(APIC_DEBUG, "Getting LVT1: %x\n", reg1); | |
1053 | ||
1054 | return 1; | |
1055 | } | |
1056 | ||
0e078e2f TG |
1057 | /** |
1058 | * sync_Arb_IDs - synchronize APIC bus arbitration IDs | |
1059 | */ | |
1da177e4 LT |
1060 | void __init sync_Arb_IDs(void) |
1061 | { | |
296cb951 CG |
1062 | /* |
1063 | * Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 And not | |
1064 | * needed on AMD. | |
1065 | */ | |
1066 | if (modern_apic() || boot_cpu_data.x86_vendor == X86_VENDOR_AMD) | |
1da177e4 LT |
1067 | return; |
1068 | ||
1069 | /* | |
1070 | * Wait for idle. | |
1071 | */ | |
1072 | apic_wait_icr_idle(); | |
1073 | ||
1074 | apic_printk(APIC_DEBUG, "Synchronizing Arb IDs.\n"); | |
6f6da97f CG |
1075 | apic_write(APIC_ICR, APIC_DEST_ALLINC | |
1076 | APIC_INT_LEVELTRIG | APIC_DM_INIT); | |
1da177e4 LT |
1077 | } |
1078 | ||
1da177e4 LT |
1079 | /* |
1080 | * An initial setup of the virtual wire mode. | |
1081 | */ | |
1082 | void __init init_bsp_APIC(void) | |
1083 | { | |
11a8e778 | 1084 | unsigned int value; |
1da177e4 LT |
1085 | |
1086 | /* | |
1087 | * Don't do the setup now if we have a SMP BIOS as the | |
1088 | * through-I/O-APIC virtual wire mode might be active. | |
1089 | */ | |
1090 | if (smp_found_config || !cpu_has_apic) | |
1091 | return; | |
1092 | ||
1da177e4 LT |
1093 | /* |
1094 | * Do not trust the local APIC being empty at bootup. | |
1095 | */ | |
1096 | clear_local_APIC(); | |
1097 | ||
1098 | /* | |
1099 | * Enable APIC. | |
1100 | */ | |
1101 | value = apic_read(APIC_SPIV); | |
1102 | value &= ~APIC_VECTOR_MASK; | |
1103 | value |= APIC_SPIV_APIC_ENABLED; | |
638c0411 CG |
1104 | |
1105 | #ifdef CONFIG_X86_32 | |
1106 | /* This bit is reserved on P4/Xeon and should be cleared */ | |
1107 | if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) && | |
1108 | (boot_cpu_data.x86 == 15)) | |
1109 | value &= ~APIC_SPIV_FOCUS_DISABLED; | |
1110 | else | |
1111 | #endif | |
1112 | value |= APIC_SPIV_FOCUS_DISABLED; | |
1da177e4 | 1113 | value |= SPURIOUS_APIC_VECTOR; |
11a8e778 | 1114 | apic_write(APIC_SPIV, value); |
1da177e4 LT |
1115 | |
1116 | /* | |
1117 | * Set up the virtual wire mode. | |
1118 | */ | |
11a8e778 | 1119 | apic_write(APIC_LVT0, APIC_DM_EXTINT); |
1da177e4 | 1120 | value = APIC_DM_NMI; |
638c0411 CG |
1121 | if (!lapic_is_integrated()) /* 82489DX */ |
1122 | value |= APIC_LVT_LEVEL_TRIGGER; | |
11a8e778 | 1123 | apic_write(APIC_LVT1, value); |
1da177e4 LT |
1124 | } |
1125 | ||
c43da2f5 CG |
1126 | static void __cpuinit lapic_setup_esr(void) |
1127 | { | |
9df08f10 CG |
1128 | unsigned int oldvalue, value, maxlvt; |
1129 | ||
1130 | if (!lapic_is_integrated()) { | |
ba21ebb6 | 1131 | pr_info("No ESR for 82489DX.\n"); |
9df08f10 CG |
1132 | return; |
1133 | } | |
c43da2f5 | 1134 | |
08125d3e | 1135 | if (apic->disable_esr) { |
c43da2f5 | 1136 | /* |
9df08f10 CG |
1137 | * Something untraceable is creating bad interrupts on |
1138 | * secondary quads ... for the moment, just leave the | |
1139 | * ESR disabled - we can't do anything useful with the | |
1140 | * errors anyway - mbligh | |
c43da2f5 | 1141 | */ |
ba21ebb6 | 1142 | pr_info("Leaving ESR disabled.\n"); |
9df08f10 | 1143 | return; |
c43da2f5 | 1144 | } |
9df08f10 CG |
1145 | |
1146 | maxlvt = lapic_get_maxlvt(); | |
1147 | if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */ | |
1148 | apic_write(APIC_ESR, 0); | |
1149 | oldvalue = apic_read(APIC_ESR); | |
1150 | ||
1151 | /* enables sending errors */ | |
1152 | value = ERROR_APIC_VECTOR; | |
1153 | apic_write(APIC_LVTERR, value); | |
1154 | ||
1155 | /* | |
1156 | * spec says clear errors after enabling vector. | |
1157 | */ | |
1158 | if (maxlvt > 3) | |
1159 | apic_write(APIC_ESR, 0); | |
1160 | value = apic_read(APIC_ESR); | |
1161 | if (value != oldvalue) | |
1162 | apic_printk(APIC_VERBOSE, "ESR value before enabling " | |
1163 | "vector: 0x%08x after: 0x%08x\n", | |
1164 | oldvalue, value); | |
c43da2f5 CG |
1165 | } |
1166 | ||
1167 | ||
0e078e2f TG |
1168 | /** |
1169 | * setup_local_APIC - setup the local APIC | |
1170 | */ | |
1171 | void __cpuinit setup_local_APIC(void) | |
1da177e4 | 1172 | { |
739f33b3 | 1173 | unsigned int value; |
da7ed9f9 | 1174 | int i, j; |
1da177e4 | 1175 | |
f1182638 | 1176 | if (disable_apic) { |
65a4e574 | 1177 | arch_disable_smp_support(); |
f1182638 JB |
1178 | return; |
1179 | } | |
1180 | ||
89c38c28 CG |
1181 | #ifdef CONFIG_X86_32 |
1182 | /* Pound the ESR really hard over the head with a big hammer - mbligh */ | |
08125d3e | 1183 | if (lapic_is_integrated() && apic->disable_esr) { |
89c38c28 CG |
1184 | apic_write(APIC_ESR, 0); |
1185 | apic_write(APIC_ESR, 0); | |
1186 | apic_write(APIC_ESR, 0); | |
1187 | apic_write(APIC_ESR, 0); | |
1188 | } | |
1189 | #endif | |
c323d95f | 1190 | perf_counters_lapic_init(); |
89c38c28 | 1191 | |
ac23d4ee | 1192 | preempt_disable(); |
1da177e4 | 1193 | |
1da177e4 LT |
1194 | /* |
1195 | * Double-check whether this APIC is really registered. | |
1196 | * This is meaningless in clustered apic mode, so we skip it. | |
1197 | */ | |
7ed248da | 1198 | if (!apic->apic_id_registered()) |
1da177e4 LT |
1199 | BUG(); |
1200 | ||
1201 | /* | |
1202 | * Intel recommends to set DFR, LDR and TPR before enabling | |
1203 | * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel | |
1204 | * document number 292116). So here it goes... | |
1205 | */ | |
a5c43296 | 1206 | apic->init_apic_ldr(); |
1da177e4 LT |
1207 | |
1208 | /* | |
1209 | * Set Task Priority to 'accept all'. We never change this | |
1210 | * later on. | |
1211 | */ | |
1212 | value = apic_read(APIC_TASKPRI); | |
1213 | value &= ~APIC_TPRI_MASK; | |
11a8e778 | 1214 | apic_write(APIC_TASKPRI, value); |
1da177e4 | 1215 | |
da7ed9f9 VG |
1216 | /* |
1217 | * After a crash, we no longer service the interrupts and a pending | |
1218 | * interrupt from previous kernel might still have ISR bit set. | |
1219 | * | |
1220 | * Most probably by now CPU has serviced that pending interrupt and | |
1221 | * it might not have done the ack_APIC_irq() because it thought, | |
1222 | * interrupt came from i8259 as ExtInt. LAPIC did not get EOI so it | |
1223 | * does not clear the ISR bit and cpu thinks it has already serivced | |
1224 | * the interrupt. Hence a vector might get locked. It was noticed | |
1225 | * for timer irq (vector 0x31). Issue an extra EOI to clear ISR. | |
1226 | */ | |
1227 | for (i = APIC_ISR_NR - 1; i >= 0; i--) { | |
1228 | value = apic_read(APIC_ISR + i*0x10); | |
1229 | for (j = 31; j >= 0; j--) { | |
1230 | if (value & (1<<j)) | |
1231 | ack_APIC_irq(); | |
1232 | } | |
1233 | } | |
1234 | ||
1da177e4 LT |
1235 | /* |
1236 | * Now that we are all set up, enable the APIC | |
1237 | */ | |
1238 | value = apic_read(APIC_SPIV); | |
1239 | value &= ~APIC_VECTOR_MASK; | |
1240 | /* | |
1241 | * Enable APIC | |
1242 | */ | |
1243 | value |= APIC_SPIV_APIC_ENABLED; | |
1244 | ||
89c38c28 CG |
1245 | #ifdef CONFIG_X86_32 |
1246 | /* | |
1247 | * Some unknown Intel IO/APIC (or APIC) errata is biting us with | |
1248 | * certain networking cards. If high frequency interrupts are | |
1249 | * happening on a particular IOAPIC pin, plus the IOAPIC routing | |
1250 | * entry is masked/unmasked at a high rate as well then sooner or | |
1251 | * later IOAPIC line gets 'stuck', no more interrupts are received | |
1252 | * from the device. If focus CPU is disabled then the hang goes | |
1253 | * away, oh well :-( | |
1254 | * | |
1255 | * [ This bug can be reproduced easily with a level-triggered | |
1256 | * PCI Ne2000 networking cards and PII/PIII processors, dual | |
1257 | * BX chipset. ] | |
1258 | */ | |
1259 | /* | |
1260 | * Actually disabling the focus CPU check just makes the hang less | |
1261 | * frequent as it makes the interrupt distributon model be more | |
1262 | * like LRU than MRU (the short-term load is more even across CPUs). | |
1263 | * See also the comment in end_level_ioapic_irq(). --macro | |
1264 | */ | |
1265 | ||
1266 | /* | |
1267 | * - enable focus processor (bit==0) | |
1268 | * - 64bit mode always use processor focus | |
1269 | * so no need to set it | |
1270 | */ | |
1271 | value &= ~APIC_SPIV_FOCUS_DISABLED; | |
1272 | #endif | |
3f14c746 | 1273 | |
1da177e4 LT |
1274 | /* |
1275 | * Set spurious IRQ vector | |
1276 | */ | |
1277 | value |= SPURIOUS_APIC_VECTOR; | |
11a8e778 | 1278 | apic_write(APIC_SPIV, value); |
1da177e4 LT |
1279 | |
1280 | /* | |
1281 | * Set up LVT0, LVT1: | |
1282 | * | |
1283 | * set up through-local-APIC on the BP's LINT0. This is not | |
1284 | * strictly necessary in pure symmetric-IO mode, but sometimes | |
1285 | * we delegate interrupts to the 8259A. | |
1286 | */ | |
1287 | /* | |
1288 | * TODO: set up through-local-APIC from through-I/O-APIC? --macro | |
1289 | */ | |
1290 | value = apic_read(APIC_LVT0) & APIC_LVT_MASKED; | |
89c38c28 | 1291 | if (!smp_processor_id() && (pic_mode || !value)) { |
1da177e4 | 1292 | value = APIC_DM_EXTINT; |
bc1d99c1 | 1293 | apic_printk(APIC_VERBOSE, "enabled ExtINT on CPU#%d\n", |
89c38c28 | 1294 | smp_processor_id()); |
1da177e4 LT |
1295 | } else { |
1296 | value = APIC_DM_EXTINT | APIC_LVT_MASKED; | |
bc1d99c1 | 1297 | apic_printk(APIC_VERBOSE, "masked ExtINT on CPU#%d\n", |
89c38c28 | 1298 | smp_processor_id()); |
1da177e4 | 1299 | } |
11a8e778 | 1300 | apic_write(APIC_LVT0, value); |
1da177e4 LT |
1301 | |
1302 | /* | |
1303 | * only the BP should see the LINT1 NMI signal, obviously. | |
1304 | */ | |
1305 | if (!smp_processor_id()) | |
1306 | value = APIC_DM_NMI; | |
1307 | else | |
1308 | value = APIC_DM_NMI | APIC_LVT_MASKED; | |
89c38c28 CG |
1309 | if (!lapic_is_integrated()) /* 82489DX */ |
1310 | value |= APIC_LVT_LEVEL_TRIGGER; | |
11a8e778 | 1311 | apic_write(APIC_LVT1, value); |
89c38c28 | 1312 | |
ac23d4ee | 1313 | preempt_enable(); |
be71b855 AK |
1314 | |
1315 | #ifdef CONFIG_X86_MCE_INTEL | |
1316 | /* Recheck CMCI information after local APIC is up on CPU #0 */ | |
1317 | if (smp_processor_id() == 0) | |
1318 | cmci_recheck(); | |
1319 | #endif | |
739f33b3 | 1320 | } |
1da177e4 | 1321 | |
739f33b3 AK |
1322 | void __cpuinit end_local_APIC_setup(void) |
1323 | { | |
1324 | lapic_setup_esr(); | |
fa6b95fc CG |
1325 | |
1326 | #ifdef CONFIG_X86_32 | |
1b4ee4e4 CG |
1327 | { |
1328 | unsigned int value; | |
1329 | /* Disable the local apic timer */ | |
1330 | value = apic_read(APIC_LVTT); | |
1331 | value |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR); | |
1332 | apic_write(APIC_LVTT, value); | |
1333 | } | |
fa6b95fc CG |
1334 | #endif |
1335 | ||
f2802e7f | 1336 | setup_apic_nmi_watchdog(NULL); |
0e078e2f | 1337 | apic_pm_activate(); |
1da177e4 | 1338 | } |
1da177e4 | 1339 | |
06cd9a7d | 1340 | #ifdef CONFIG_X86_X2APIC |
6e1cb38a SS |
1341 | void check_x2apic(void) |
1342 | { | |
ef1f87aa | 1343 | if (x2apic_enabled()) { |
ba21ebb6 | 1344 | pr_info("x2apic enabled by BIOS, switching to x2apic ops\n"); |
fc1edaf9 | 1345 | x2apic_preenabled = x2apic_mode = 1; |
6e1cb38a SS |
1346 | } |
1347 | } | |
1348 | ||
1349 | void enable_x2apic(void) | |
1350 | { | |
1351 | int msr, msr2; | |
1352 | ||
fc1edaf9 | 1353 | if (!x2apic_mode) |
06cd9a7d YL |
1354 | return; |
1355 | ||
6e1cb38a SS |
1356 | rdmsr(MSR_IA32_APICBASE, msr, msr2); |
1357 | if (!(msr & X2APIC_ENABLE)) { | |
ba21ebb6 | 1358 | pr_info("Enabling x2apic\n"); |
6e1cb38a SS |
1359 | wrmsr(MSR_IA32_APICBASE, msr | X2APIC_ENABLE, 0); |
1360 | } | |
1361 | } | |
93758238 | 1362 | #endif /* CONFIG_X86_X2APIC */ |
6e1cb38a | 1363 | |
2236d252 | 1364 | void __init enable_IR_x2apic(void) |
6e1cb38a SS |
1365 | { |
1366 | #ifdef CONFIG_INTR_REMAP | |
1367 | int ret; | |
1368 | unsigned long flags; | |
b24696bc | 1369 | struct IO_APIC_route_entry **ioapic_entries = NULL; |
6e1cb38a | 1370 | |
93758238 WH |
1371 | ret = dmar_table_init(); |
1372 | if (ret) { | |
1373 | pr_debug("dmar_table_init() failed with %d:\n", ret); | |
1374 | goto ir_failed; | |
6e1cb38a SS |
1375 | } |
1376 | ||
93758238 WH |
1377 | if (!intr_remapping_supported()) { |
1378 | pr_debug("intr-remapping not supported\n"); | |
1379 | goto ir_failed; | |
6e1cb38a SS |
1380 | } |
1381 | ||
6e1cb38a | 1382 | |
93758238 WH |
1383 | if (!x2apic_preenabled && skip_ioapic_setup) { |
1384 | pr_info("Skipped enabling intr-remap because of skipping " | |
1385 | "io-apic setup\n"); | |
6e1cb38a SS |
1386 | return; |
1387 | } | |
1388 | ||
b24696bc FY |
1389 | ioapic_entries = alloc_ioapic_entries(); |
1390 | if (!ioapic_entries) { | |
1391 | pr_info("Allocate ioapic_entries failed: %d\n", ret); | |
1392 | goto end; | |
1393 | } | |
1394 | ||
1395 | ret = save_IO_APIC_setup(ioapic_entries); | |
5ffa4eb2 | 1396 | if (ret) { |
ba21ebb6 | 1397 | pr_info("Saving IO-APIC state failed: %d\n", ret); |
5ffa4eb2 CG |
1398 | goto end; |
1399 | } | |
6e1cb38a | 1400 | |
05c3dc2c | 1401 | local_irq_save(flags); |
b24696bc | 1402 | mask_IO_APIC_setup(ioapic_entries); |
05c3dc2c SS |
1403 | mask_8259A(); |
1404 | ||
fc1edaf9 | 1405 | ret = enable_intr_remapping(x2apic_supported()); |
6e1cb38a | 1406 | if (ret) |
5ffa4eb2 | 1407 | goto end_restore; |
6e1cb38a | 1408 | |
93758238 WH |
1409 | pr_info("Enabled Interrupt-remapping\n"); |
1410 | ||
fc1edaf9 SS |
1411 | if (x2apic_supported() && !x2apic_mode) { |
1412 | x2apic_mode = 1; | |
6e1cb38a | 1413 | enable_x2apic(); |
93758238 | 1414 | pr_info("Enabled x2apic\n"); |
6e1cb38a | 1415 | } |
5ffa4eb2 CG |
1416 | |
1417 | end_restore: | |
6e1cb38a SS |
1418 | if (ret) |
1419 | /* | |
1420 | * IR enabling failed | |
1421 | */ | |
b24696bc | 1422 | restore_IO_APIC_setup(ioapic_entries); |
6e1cb38a SS |
1423 | |
1424 | unmask_8259A(); | |
1425 | local_irq_restore(flags); | |
1426 | ||
05c3dc2c | 1427 | end: |
b24696bc FY |
1428 | if (ioapic_entries) |
1429 | free_ioapic_entries(ioapic_entries); | |
93758238 WH |
1430 | |
1431 | if (!ret) | |
1432 | return; | |
1433 | ||
1434 | ir_failed: | |
1435 | if (x2apic_preenabled) | |
1436 | panic("x2apic enabled by bios. But IR enabling failed"); | |
1437 | else if (cpu_has_x2apic) | |
1438 | pr_info("Not enabling x2apic,Intr-remapping\n"); | |
6e1cb38a SS |
1439 | #else |
1440 | if (!cpu_has_x2apic) | |
1441 | return; | |
1442 | ||
1443 | if (x2apic_preenabled) | |
1444 | panic("x2apic enabled prior OS handover," | |
93758238 | 1445 | " enable CONFIG_X86_X2APIC, CONFIG_INTR_REMAP"); |
6e1cb38a SS |
1446 | #endif |
1447 | ||
1448 | return; | |
1449 | } | |
93758238 | 1450 | |
6e1cb38a | 1451 | |
be7a656f | 1452 | #ifdef CONFIG_X86_64 |
1da177e4 LT |
1453 | /* |
1454 | * Detect and enable local APICs on non-SMP boards. | |
1455 | * Original code written by Keir Fraser. | |
1456 | * On AMD64 we trust the BIOS - if it says no APIC it is likely | |
6935d1f9 | 1457 | * not correctly set up (usually the APIC timer won't work etc.) |
1da177e4 | 1458 | */ |
0e078e2f | 1459 | static int __init detect_init_APIC(void) |
1da177e4 LT |
1460 | { |
1461 | if (!cpu_has_apic) { | |
ba21ebb6 | 1462 | pr_info("No local APIC present\n"); |
1da177e4 LT |
1463 | return -1; |
1464 | } | |
1465 | ||
1466 | mp_lapic_addr = APIC_DEFAULT_PHYS_BASE; | |
1da177e4 LT |
1467 | return 0; |
1468 | } | |
be7a656f YL |
1469 | #else |
1470 | /* | |
1471 | * Detect and initialize APIC | |
1472 | */ | |
1473 | static int __init detect_init_APIC(void) | |
1474 | { | |
1475 | u32 h, l, features; | |
1476 | ||
1477 | /* Disabled by kernel option? */ | |
1478 | if (disable_apic) | |
1479 | return -1; | |
1480 | ||
1481 | switch (boot_cpu_data.x86_vendor) { | |
1482 | case X86_VENDOR_AMD: | |
1483 | if ((boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model > 1) || | |
85877061 | 1484 | (boot_cpu_data.x86 >= 15)) |
be7a656f YL |
1485 | break; |
1486 | goto no_apic; | |
1487 | case X86_VENDOR_INTEL: | |
1488 | if (boot_cpu_data.x86 == 6 || boot_cpu_data.x86 == 15 || | |
1489 | (boot_cpu_data.x86 == 5 && cpu_has_apic)) | |
1490 | break; | |
1491 | goto no_apic; | |
1492 | default: | |
1493 | goto no_apic; | |
1494 | } | |
1495 | ||
1496 | if (!cpu_has_apic) { | |
1497 | /* | |
1498 | * Over-ride BIOS and try to enable the local APIC only if | |
1499 | * "lapic" specified. | |
1500 | */ | |
1501 | if (!force_enable_local_apic) { | |
ba21ebb6 CG |
1502 | pr_info("Local APIC disabled by BIOS -- " |
1503 | "you can enable it with \"lapic\"\n"); | |
be7a656f YL |
1504 | return -1; |
1505 | } | |
1506 | /* | |
1507 | * Some BIOSes disable the local APIC in the APIC_BASE | |
1508 | * MSR. This can only be done in software for Intel P6 or later | |
1509 | * and AMD K7 (Model > 1) or later. | |
1510 | */ | |
1511 | rdmsr(MSR_IA32_APICBASE, l, h); | |
1512 | if (!(l & MSR_IA32_APICBASE_ENABLE)) { | |
ba21ebb6 | 1513 | pr_info("Local APIC disabled by BIOS -- reenabling.\n"); |
be7a656f YL |
1514 | l &= ~MSR_IA32_APICBASE_BASE; |
1515 | l |= MSR_IA32_APICBASE_ENABLE | APIC_DEFAULT_PHYS_BASE; | |
1516 | wrmsr(MSR_IA32_APICBASE, l, h); | |
1517 | enabled_via_apicbase = 1; | |
1518 | } | |
1519 | } | |
1520 | /* | |
1521 | * The APIC feature bit should now be enabled | |
1522 | * in `cpuid' | |
1523 | */ | |
1524 | features = cpuid_edx(1); | |
1525 | if (!(features & (1 << X86_FEATURE_APIC))) { | |
ba21ebb6 | 1526 | pr_warning("Could not enable APIC!\n"); |
be7a656f YL |
1527 | return -1; |
1528 | } | |
1529 | set_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC); | |
1530 | mp_lapic_addr = APIC_DEFAULT_PHYS_BASE; | |
1531 | ||
1532 | /* The BIOS may have set up the APIC at some other address */ | |
1533 | rdmsr(MSR_IA32_APICBASE, l, h); | |
1534 | if (l & MSR_IA32_APICBASE_ENABLE) | |
1535 | mp_lapic_addr = l & MSR_IA32_APICBASE_BASE; | |
1536 | ||
ba21ebb6 | 1537 | pr_info("Found and enabled local APIC!\n"); |
be7a656f YL |
1538 | |
1539 | apic_pm_activate(); | |
1540 | ||
1541 | return 0; | |
1542 | ||
1543 | no_apic: | |
ba21ebb6 | 1544 | pr_info("No local APIC present or hardware disabled\n"); |
be7a656f YL |
1545 | return -1; |
1546 | } | |
1547 | #endif | |
1da177e4 | 1548 | |
f28c0ae2 | 1549 | #ifdef CONFIG_X86_64 |
8643f9d0 YL |
1550 | void __init early_init_lapic_mapping(void) |
1551 | { | |
431ee79d | 1552 | unsigned long phys_addr; |
8643f9d0 YL |
1553 | |
1554 | /* | |
1555 | * If no local APIC can be found then go out | |
1556 | * : it means there is no mpatable and MADT | |
1557 | */ | |
1558 | if (!smp_found_config) | |
1559 | return; | |
1560 | ||
431ee79d | 1561 | phys_addr = mp_lapic_addr; |
8643f9d0 | 1562 | |
431ee79d | 1563 | set_fixmap_nocache(FIX_APIC_BASE, phys_addr); |
8643f9d0 | 1564 | apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n", |
431ee79d | 1565 | APIC_BASE, phys_addr); |
8643f9d0 YL |
1566 | |
1567 | /* | |
1568 | * Fetch the APIC ID of the BSP in case we have a | |
1569 | * default configuration (or the MP table is broken). | |
1570 | */ | |
4c9961d5 | 1571 | boot_cpu_physical_apicid = read_apic_id(); |
8643f9d0 | 1572 | } |
f28c0ae2 | 1573 | #endif |
8643f9d0 | 1574 | |
0e078e2f TG |
1575 | /** |
1576 | * init_apic_mappings - initialize APIC mappings | |
1577 | */ | |
1da177e4 LT |
1578 | void __init init_apic_mappings(void) |
1579 | { | |
4401da61 YL |
1580 | unsigned int new_apicid; |
1581 | ||
fc1edaf9 | 1582 | if (x2apic_mode) { |
4c9961d5 | 1583 | boot_cpu_physical_apicid = read_apic_id(); |
6e1cb38a SS |
1584 | return; |
1585 | } | |
1586 | ||
4797f6b0 | 1587 | /* If no local APIC can be found return early */ |
1da177e4 | 1588 | if (!smp_found_config && detect_init_APIC()) { |
4797f6b0 YL |
1589 | /* lets NOP'ify apic operations */ |
1590 | pr_info("APIC: disable apic facility\n"); | |
1591 | apic_disable(); | |
1592 | } else { | |
1da177e4 LT |
1593 | apic_phys = mp_lapic_addr; |
1594 | ||
4797f6b0 YL |
1595 | /* |
1596 | * acpi lapic path already maps that address in | |
1597 | * acpi_register_lapic_address() | |
1598 | */ | |
1599 | if (!acpi_lapic) | |
1600 | set_fixmap_nocache(FIX_APIC_BASE, apic_phys); | |
cec6be6d | 1601 | |
4797f6b0 YL |
1602 | apic_printk(APIC_VERBOSE, "mapped APIC to %08lx (%08lx)\n", |
1603 | APIC_BASE, apic_phys); | |
cec6be6d | 1604 | } |
1da177e4 LT |
1605 | |
1606 | /* | |
1607 | * Fetch the APIC ID of the BSP in case we have a | |
1608 | * default configuration (or the MP table is broken). | |
1609 | */ | |
4401da61 YL |
1610 | new_apicid = read_apic_id(); |
1611 | if (boot_cpu_physical_apicid != new_apicid) { | |
1612 | boot_cpu_physical_apicid = new_apicid; | |
103428e5 CG |
1613 | /* |
1614 | * yeah -- we lie about apic_version | |
1615 | * in case if apic was disabled via boot option | |
1616 | * but it's not a problem for SMP compiled kernel | |
1617 | * since smp_sanity_check is prepared for such a case | |
1618 | * and disable smp mode | |
1619 | */ | |
4401da61 YL |
1620 | apic_version[new_apicid] = |
1621 | GET_APIC_VERSION(apic_read(APIC_LVR)); | |
08306ce6 | 1622 | } |
1da177e4 LT |
1623 | } |
1624 | ||
1625 | /* | |
0e078e2f TG |
1626 | * This initializes the IO-APIC and APIC hardware if this is |
1627 | * a UP kernel. | |
1da177e4 | 1628 | */ |
1b313f4a CG |
1629 | int apic_version[MAX_APICS]; |
1630 | ||
0e078e2f | 1631 | int __init APIC_init_uniprocessor(void) |
1da177e4 | 1632 | { |
0e078e2f | 1633 | if (disable_apic) { |
ba21ebb6 | 1634 | pr_info("Apic disabled\n"); |
0e078e2f TG |
1635 | return -1; |
1636 | } | |
f1182638 | 1637 | #ifdef CONFIG_X86_64 |
0e078e2f TG |
1638 | if (!cpu_has_apic) { |
1639 | disable_apic = 1; | |
ba21ebb6 | 1640 | pr_info("Apic disabled by BIOS\n"); |
0e078e2f TG |
1641 | return -1; |
1642 | } | |
fa2bd35a YL |
1643 | #else |
1644 | if (!smp_found_config && !cpu_has_apic) | |
1645 | return -1; | |
1646 | ||
1647 | /* | |
1648 | * Complain if the BIOS pretends there is one. | |
1649 | */ | |
1650 | if (!cpu_has_apic && | |
1651 | APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) { | |
ba21ebb6 CG |
1652 | pr_err("BIOS bug, local APIC 0x%x not detected!...\n", |
1653 | boot_cpu_physical_apicid); | |
fa2bd35a YL |
1654 | clear_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC); |
1655 | return -1; | |
1656 | } | |
1657 | #endif | |
1658 | ||
6e1cb38a | 1659 | enable_IR_x2apic(); |
fa2bd35a | 1660 | #ifdef CONFIG_X86_64 |
72ce0165 | 1661 | default_setup_apic_routing(); |
fa2bd35a | 1662 | #endif |
6e1cb38a | 1663 | |
0e078e2f | 1664 | verify_local_APIC(); |
b5841765 GC |
1665 | connect_bsp_APIC(); |
1666 | ||
fa2bd35a | 1667 | #ifdef CONFIG_X86_64 |
c70dcb74 | 1668 | apic_write(APIC_ID, SET_APIC_ID(boot_cpu_physical_apicid)); |
fa2bd35a YL |
1669 | #else |
1670 | /* | |
1671 | * Hack: In case of kdump, after a crash, kernel might be booting | |
1672 | * on a cpu with non-zero lapic id. But boot_cpu_physical_apicid | |
1673 | * might be zero if read from MP tables. Get it from LAPIC. | |
1674 | */ | |
1675 | # ifdef CONFIG_CRASH_DUMP | |
1676 | boot_cpu_physical_apicid = read_apic_id(); | |
1677 | # endif | |
1678 | #endif | |
1679 | physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map); | |
0e078e2f | 1680 | setup_local_APIC(); |
1da177e4 | 1681 | |
88d0f550 | 1682 | #ifdef CONFIG_X86_IO_APIC |
739f33b3 AK |
1683 | /* |
1684 | * Now enable IO-APICs, actually call clear_IO_APIC | |
98c061b6 | 1685 | * We need clear_IO_APIC before enabling error vector |
739f33b3 AK |
1686 | */ |
1687 | if (!skip_ioapic_setup && nr_ioapics) | |
1688 | enable_IO_APIC(); | |
fa2bd35a | 1689 | #endif |
739f33b3 AK |
1690 | |
1691 | end_local_APIC_setup(); | |
1692 | ||
fa2bd35a | 1693 | #ifdef CONFIG_X86_IO_APIC |
0e078e2f TG |
1694 | if (smp_found_config && !skip_ioapic_setup && nr_ioapics) |
1695 | setup_IO_APIC(); | |
98c061b6 | 1696 | else { |
0e078e2f | 1697 | nr_ioapics = 0; |
98c061b6 YL |
1698 | localise_nmi_watchdog(); |
1699 | } | |
1700 | #else | |
1701 | localise_nmi_watchdog(); | |
fa2bd35a YL |
1702 | #endif |
1703 | ||
98c061b6 | 1704 | setup_boot_clock(); |
fa2bd35a | 1705 | #ifdef CONFIG_X86_64 |
0e078e2f | 1706 | check_nmi_watchdog(); |
fa2bd35a YL |
1707 | #endif |
1708 | ||
0e078e2f | 1709 | return 0; |
1da177e4 LT |
1710 | } |
1711 | ||
1712 | /* | |
0e078e2f | 1713 | * Local APIC interrupts |
1da177e4 LT |
1714 | */ |
1715 | ||
0e078e2f TG |
1716 | /* |
1717 | * This interrupt should _never_ happen with our APIC/SMP architecture | |
1718 | */ | |
dc1528dd | 1719 | void smp_spurious_interrupt(struct pt_regs *regs) |
1da177e4 | 1720 | { |
dc1528dd YL |
1721 | u32 v; |
1722 | ||
0e078e2f TG |
1723 | exit_idle(); |
1724 | irq_enter(); | |
1da177e4 | 1725 | /* |
0e078e2f TG |
1726 | * Check if this really is a spurious interrupt and ACK it |
1727 | * if it is a vectored one. Just in case... | |
1728 | * Spurious interrupts should not be ACKed. | |
1da177e4 | 1729 | */ |
0e078e2f TG |
1730 | v = apic_read(APIC_ISR + ((SPURIOUS_APIC_VECTOR & ~0x1f) >> 1)); |
1731 | if (v & (1 << (SPURIOUS_APIC_VECTOR & 0x1f))) | |
1732 | ack_APIC_irq(); | |
c4d58cbd | 1733 | |
915b0d01 HS |
1734 | inc_irq_stat(irq_spurious_count); |
1735 | ||
dc1528dd | 1736 | /* see sw-dev-man vol 3, chapter 7.4.13.5 */ |
ba21ebb6 CG |
1737 | pr_info("spurious APIC interrupt on CPU#%d, " |
1738 | "should never happen.\n", smp_processor_id()); | |
0e078e2f TG |
1739 | irq_exit(); |
1740 | } | |
1da177e4 | 1741 | |
0e078e2f TG |
1742 | /* |
1743 | * This interrupt should never happen with our APIC/SMP architecture | |
1744 | */ | |
dc1528dd | 1745 | void smp_error_interrupt(struct pt_regs *regs) |
0e078e2f | 1746 | { |
dc1528dd | 1747 | u32 v, v1; |
1da177e4 | 1748 | |
0e078e2f TG |
1749 | exit_idle(); |
1750 | irq_enter(); | |
1751 | /* First tickle the hardware, only then report what went on. -- REW */ | |
1752 | v = apic_read(APIC_ESR); | |
1753 | apic_write(APIC_ESR, 0); | |
1754 | v1 = apic_read(APIC_ESR); | |
1755 | ack_APIC_irq(); | |
1756 | atomic_inc(&irq_err_count); | |
ba7eda4c | 1757 | |
ba21ebb6 CG |
1758 | /* |
1759 | * Here is what the APIC error bits mean: | |
1760 | * 0: Send CS error | |
1761 | * 1: Receive CS error | |
1762 | * 2: Send accept error | |
1763 | * 3: Receive accept error | |
1764 | * 4: Reserved | |
1765 | * 5: Send illegal vector | |
1766 | * 6: Received illegal vector | |
1767 | * 7: Illegal register address | |
1768 | */ | |
1769 | pr_debug("APIC error on CPU%d: %02x(%02x)\n", | |
0e078e2f TG |
1770 | smp_processor_id(), v , v1); |
1771 | irq_exit(); | |
1da177e4 LT |
1772 | } |
1773 | ||
b5841765 | 1774 | /** |
36c9d674 CG |
1775 | * connect_bsp_APIC - attach the APIC to the interrupt system |
1776 | */ | |
b5841765 GC |
1777 | void __init connect_bsp_APIC(void) |
1778 | { | |
36c9d674 CG |
1779 | #ifdef CONFIG_X86_32 |
1780 | if (pic_mode) { | |
1781 | /* | |
1782 | * Do not trust the local APIC being empty at bootup. | |
1783 | */ | |
1784 | clear_local_APIC(); | |
1785 | /* | |
1786 | * PIC mode, enable APIC mode in the IMCR, i.e. connect BSP's | |
1787 | * local APIC to INT and NMI lines. | |
1788 | */ | |
1789 | apic_printk(APIC_VERBOSE, "leaving PIC mode, " | |
1790 | "enabling APIC mode.\n"); | |
c0eaa453 | 1791 | imcr_pic_to_apic(); |
36c9d674 CG |
1792 | } |
1793 | #endif | |
49040333 IM |
1794 | if (apic->enable_apic_mode) |
1795 | apic->enable_apic_mode(); | |
b5841765 GC |
1796 | } |
1797 | ||
274cfe59 CG |
1798 | /** |
1799 | * disconnect_bsp_APIC - detach the APIC from the interrupt system | |
1800 | * @virt_wire_setup: indicates, whether virtual wire mode is selected | |
1801 | * | |
1802 | * Virtual wire mode is necessary to deliver legacy interrupts even when the | |
1803 | * APIC is disabled. | |
1804 | */ | |
0e078e2f | 1805 | void disconnect_bsp_APIC(int virt_wire_setup) |
1da177e4 | 1806 | { |
1b4ee4e4 CG |
1807 | unsigned int value; |
1808 | ||
c177b0bc CG |
1809 | #ifdef CONFIG_X86_32 |
1810 | if (pic_mode) { | |
1811 | /* | |
1812 | * Put the board back into PIC mode (has an effect only on | |
1813 | * certain older boards). Note that APIC interrupts, including | |
1814 | * IPIs, won't work beyond this point! The only exception are | |
1815 | * INIT IPIs. | |
1816 | */ | |
1817 | apic_printk(APIC_VERBOSE, "disabling APIC mode, " | |
1818 | "entering PIC mode.\n"); | |
c0eaa453 | 1819 | imcr_apic_to_pic(); |
c177b0bc CG |
1820 | return; |
1821 | } | |
1822 | #endif | |
1823 | ||
0e078e2f | 1824 | /* Go back to Virtual Wire compatibility mode */ |
1da177e4 | 1825 | |
0e078e2f TG |
1826 | /* For the spurious interrupt use vector F, and enable it */ |
1827 | value = apic_read(APIC_SPIV); | |
1828 | value &= ~APIC_VECTOR_MASK; | |
1829 | value |= APIC_SPIV_APIC_ENABLED; | |
1830 | value |= 0xf; | |
1831 | apic_write(APIC_SPIV, value); | |
b8ce3359 | 1832 | |
0e078e2f TG |
1833 | if (!virt_wire_setup) { |
1834 | /* | |
1835 | * For LVT0 make it edge triggered, active high, | |
1836 | * external and enabled | |
1837 | */ | |
1838 | value = apic_read(APIC_LVT0); | |
1839 | value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING | | |
1840 | APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR | | |
1841 | APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED); | |
1842 | value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING; | |
1843 | value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_EXTINT); | |
1844 | apic_write(APIC_LVT0, value); | |
1845 | } else { | |
1846 | /* Disable LVT0 */ | |
1847 | apic_write(APIC_LVT0, APIC_LVT_MASKED); | |
1848 | } | |
b8ce3359 | 1849 | |
c177b0bc CG |
1850 | /* |
1851 | * For LVT1 make it edge triggered, active high, | |
1852 | * nmi and enabled | |
1853 | */ | |
0e078e2f TG |
1854 | value = apic_read(APIC_LVT1); |
1855 | value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING | | |
1856 | APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR | | |
1857 | APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED); | |
1858 | value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING; | |
1859 | value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_NMI); | |
1860 | apic_write(APIC_LVT1, value); | |
1da177e4 LT |
1861 | } |
1862 | ||
be8a5685 AS |
1863 | void __cpuinit generic_processor_info(int apicid, int version) |
1864 | { | |
1865 | int cpu; | |
be8a5685 | 1866 | |
1b313f4a CG |
1867 | /* |
1868 | * Validate version | |
1869 | */ | |
1870 | if (version == 0x0) { | |
ba21ebb6 | 1871 | pr_warning("BIOS bug, APIC version is 0 for CPU#%d! " |
3b11ce7f MT |
1872 | "fixing up to 0x10. (tell your hw vendor)\n", |
1873 | version); | |
1b313f4a | 1874 | version = 0x10; |
be8a5685 | 1875 | } |
1b313f4a | 1876 | apic_version[apicid] = version; |
be8a5685 | 1877 | |
3b11ce7f MT |
1878 | if (num_processors >= nr_cpu_ids) { |
1879 | int max = nr_cpu_ids; | |
1880 | int thiscpu = max + disabled_cpus; | |
1881 | ||
1882 | pr_warning( | |
1883 | "ACPI: NR_CPUS/possible_cpus limit of %i reached." | |
1884 | " Processor %d/0x%x ignored.\n", max, thiscpu, apicid); | |
1885 | ||
1886 | disabled_cpus++; | |
be8a5685 AS |
1887 | return; |
1888 | } | |
1889 | ||
1890 | num_processors++; | |
3b11ce7f | 1891 | cpu = cpumask_next_zero(-1, cpu_present_mask); |
be8a5685 | 1892 | |
b2b815d8 MT |
1893 | if (version != apic_version[boot_cpu_physical_apicid]) |
1894 | WARN_ONCE(1, | |
1895 | "ACPI: apic version mismatch, bootcpu: %x cpu %d: %x\n", | |
1896 | apic_version[boot_cpu_physical_apicid], cpu, version); | |
1897 | ||
be8a5685 AS |
1898 | physid_set(apicid, phys_cpu_present_map); |
1899 | if (apicid == boot_cpu_physical_apicid) { | |
1900 | /* | |
1901 | * x86_bios_cpu_apicid is required to have processors listed | |
1902 | * in same order as logical cpu numbers. Hence the first | |
1903 | * entry is BSP, and so on. | |
1904 | */ | |
1905 | cpu = 0; | |
1906 | } | |
e0da3364 YL |
1907 | if (apicid > max_physical_apicid) |
1908 | max_physical_apicid = apicid; | |
1909 | ||
1b313f4a CG |
1910 | #ifdef CONFIG_X86_32 |
1911 | /* | |
1912 | * Would be preferable to switch to bigsmp when CONFIG_HOTPLUG_CPU=y | |
1913 | * but we need to work other dependencies like SMP_SUSPEND etc | |
1914 | * before this can be done without some confusion. | |
1915 | * if (CPU_HOTPLUG_ENABLED || num_processors > 8) | |
1916 | * - Ashok Raj <ashok.raj@intel.com> | |
1917 | */ | |
1918 | if (max_physical_apicid >= 8) { | |
1919 | switch (boot_cpu_data.x86_vendor) { | |
1920 | case X86_VENDOR_INTEL: | |
1921 | if (!APIC_XAPIC(version)) { | |
1922 | def_to_bigsmp = 0; | |
1923 | break; | |
1924 | } | |
1925 | /* If P4 and above fall through */ | |
1926 | case X86_VENDOR_AMD: | |
1927 | def_to_bigsmp = 1; | |
1928 | } | |
1929 | } | |
1930 | #endif | |
1931 | ||
3e5095d1 | 1932 | #if defined(CONFIG_SMP) || defined(CONFIG_X86_64) |
f10fcd47 TH |
1933 | early_per_cpu(x86_cpu_to_apicid, cpu) = apicid; |
1934 | early_per_cpu(x86_bios_cpu_apicid, cpu) = apicid; | |
1b313f4a | 1935 | #endif |
be8a5685 | 1936 | |
1de88cd4 MT |
1937 | set_cpu_possible(cpu, true); |
1938 | set_cpu_present(cpu, true); | |
be8a5685 AS |
1939 | } |
1940 | ||
0c81c746 SS |
1941 | int hard_smp_processor_id(void) |
1942 | { | |
1943 | return read_apic_id(); | |
1944 | } | |
1dcdd3d1 IM |
1945 | |
1946 | void default_init_apic_ldr(void) | |
1947 | { | |
1948 | unsigned long val; | |
1949 | ||
1950 | apic_write(APIC_DFR, APIC_DFR_VALUE); | |
1951 | val = apic_read(APIC_LDR) & ~APIC_LDR_MASK; | |
1952 | val |= SET_APIC_LOGICAL_ID(1UL << smp_processor_id()); | |
1953 | apic_write(APIC_LDR, val); | |
1954 | } | |
1955 | ||
1956 | #ifdef CONFIG_X86_32 | |
1957 | int default_apicid_to_node(int logical_apicid) | |
1958 | { | |
1959 | #ifdef CONFIG_SMP | |
1960 | return apicid_2_node[hard_smp_processor_id()]; | |
1961 | #else | |
1962 | return 0; | |
1963 | #endif | |
1964 | } | |
3491998d | 1965 | #endif |
0c81c746 | 1966 | |
89039b37 | 1967 | /* |
0e078e2f | 1968 | * Power management |
89039b37 | 1969 | */ |
0e078e2f TG |
1970 | #ifdef CONFIG_PM |
1971 | ||
1972 | static struct { | |
274cfe59 CG |
1973 | /* |
1974 | * 'active' is true if the local APIC was enabled by us and | |
1975 | * not the BIOS; this signifies that we are also responsible | |
1976 | * for disabling it before entering apm/acpi suspend | |
1977 | */ | |
0e078e2f TG |
1978 | int active; |
1979 | /* r/w apic fields */ | |
1980 | unsigned int apic_id; | |
1981 | unsigned int apic_taskpri; | |
1982 | unsigned int apic_ldr; | |
1983 | unsigned int apic_dfr; | |
1984 | unsigned int apic_spiv; | |
1985 | unsigned int apic_lvtt; | |
1986 | unsigned int apic_lvtpc; | |
1987 | unsigned int apic_lvt0; | |
1988 | unsigned int apic_lvt1; | |
1989 | unsigned int apic_lvterr; | |
1990 | unsigned int apic_tmict; | |
1991 | unsigned int apic_tdcr; | |
1992 | unsigned int apic_thmr; | |
1993 | } apic_pm_state; | |
1994 | ||
1995 | static int lapic_suspend(struct sys_device *dev, pm_message_t state) | |
1996 | { | |
1997 | unsigned long flags; | |
1998 | int maxlvt; | |
89039b37 | 1999 | |
0e078e2f TG |
2000 | if (!apic_pm_state.active) |
2001 | return 0; | |
89039b37 | 2002 | |
0e078e2f | 2003 | maxlvt = lapic_get_maxlvt(); |
89039b37 | 2004 | |
2d7a66d0 | 2005 | apic_pm_state.apic_id = apic_read(APIC_ID); |
0e078e2f TG |
2006 | apic_pm_state.apic_taskpri = apic_read(APIC_TASKPRI); |
2007 | apic_pm_state.apic_ldr = apic_read(APIC_LDR); | |
2008 | apic_pm_state.apic_dfr = apic_read(APIC_DFR); | |
2009 | apic_pm_state.apic_spiv = apic_read(APIC_SPIV); | |
2010 | apic_pm_state.apic_lvtt = apic_read(APIC_LVTT); | |
2011 | if (maxlvt >= 4) | |
2012 | apic_pm_state.apic_lvtpc = apic_read(APIC_LVTPC); | |
2013 | apic_pm_state.apic_lvt0 = apic_read(APIC_LVT0); | |
2014 | apic_pm_state.apic_lvt1 = apic_read(APIC_LVT1); | |
2015 | apic_pm_state.apic_lvterr = apic_read(APIC_LVTERR); | |
2016 | apic_pm_state.apic_tmict = apic_read(APIC_TMICT); | |
2017 | apic_pm_state.apic_tdcr = apic_read(APIC_TDCR); | |
4efc0670 | 2018 | #ifdef CONFIG_X86_THERMAL_VECTOR |
0e078e2f TG |
2019 | if (maxlvt >= 5) |
2020 | apic_pm_state.apic_thmr = apic_read(APIC_LVTTHMR); | |
2021 | #endif | |
24968cfd | 2022 | |
0e078e2f TG |
2023 | local_irq_save(flags); |
2024 | disable_local_APIC(); | |
fc1edaf9 | 2025 | |
b24696bc FY |
2026 | if (intr_remapping_enabled) |
2027 | disable_intr_remapping(); | |
fc1edaf9 | 2028 | |
0e078e2f TG |
2029 | local_irq_restore(flags); |
2030 | return 0; | |
1da177e4 LT |
2031 | } |
2032 | ||
0e078e2f | 2033 | static int lapic_resume(struct sys_device *dev) |
1da177e4 | 2034 | { |
0e078e2f TG |
2035 | unsigned int l, h; |
2036 | unsigned long flags; | |
2037 | int maxlvt; | |
3d58829b | 2038 | int ret = 0; |
b24696bc FY |
2039 | struct IO_APIC_route_entry **ioapic_entries = NULL; |
2040 | ||
0e078e2f TG |
2041 | if (!apic_pm_state.active) |
2042 | return 0; | |
89b831ef | 2043 | |
0e078e2f | 2044 | local_irq_save(flags); |
9a2755c3 | 2045 | if (intr_remapping_enabled) { |
b24696bc FY |
2046 | ioapic_entries = alloc_ioapic_entries(); |
2047 | if (!ioapic_entries) { | |
2048 | WARN(1, "Alloc ioapic_entries in lapic resume failed."); | |
3d58829b JS |
2049 | ret = -ENOMEM; |
2050 | goto restore; | |
b24696bc FY |
2051 | } |
2052 | ||
2053 | ret = save_IO_APIC_setup(ioapic_entries); | |
2054 | if (ret) { | |
2055 | WARN(1, "Saving IO-APIC state failed: %d\n", ret); | |
2056 | free_ioapic_entries(ioapic_entries); | |
3d58829b | 2057 | goto restore; |
b24696bc FY |
2058 | } |
2059 | ||
2060 | mask_IO_APIC_setup(ioapic_entries); | |
2061 | mask_8259A(); | |
b24696bc | 2062 | } |
92206c90 | 2063 | |
fc1edaf9 | 2064 | if (x2apic_mode) |
92206c90 | 2065 | enable_x2apic(); |
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 | |
9a2755c3 | 2103 | if (intr_remapping_enabled) { |
fc1edaf9 | 2104 | reenable_intr_remapping(x2apic_mode); |
b24696bc FY |
2105 | unmask_8259A(); |
2106 | restore_IO_APIC_setup(ioapic_entries); | |
2107 | free_ioapic_entries(ioapic_entries); | |
2108 | } | |
3d58829b | 2109 | restore: |
0e078e2f | 2110 | local_irq_restore(flags); |
92206c90 | 2111 | |
3d58829b | 2112 | return ret; |
0e078e2f | 2113 | } |
b8ce3359 | 2114 | |
274cfe59 CG |
2115 | /* |
2116 | * This device has no shutdown method - fully functioning local APICs | |
2117 | * are needed on every CPU up until machine_halt/restart/poweroff. | |
2118 | */ | |
2119 | ||
0e078e2f TG |
2120 | static struct sysdev_class lapic_sysclass = { |
2121 | .name = "lapic", | |
2122 | .resume = lapic_resume, | |
2123 | .suspend = lapic_suspend, | |
2124 | }; | |
b8ce3359 | 2125 | |
0e078e2f | 2126 | static struct sys_device device_lapic = { |
e83a5fdc HS |
2127 | .id = 0, |
2128 | .cls = &lapic_sysclass, | |
0e078e2f | 2129 | }; |
b8ce3359 | 2130 | |
0e078e2f TG |
2131 | static void __cpuinit apic_pm_activate(void) |
2132 | { | |
2133 | apic_pm_state.active = 1; | |
1da177e4 LT |
2134 | } |
2135 | ||
0e078e2f | 2136 | static int __init init_lapic_sysfs(void) |
1da177e4 | 2137 | { |
0e078e2f | 2138 | int error; |
e83a5fdc | 2139 | |
0e078e2f TG |
2140 | if (!cpu_has_apic) |
2141 | return 0; | |
2142 | /* XXX: remove suspend/resume procs if !apic_pm_state.active? */ | |
e83a5fdc | 2143 | |
0e078e2f TG |
2144 | error = sysdev_class_register(&lapic_sysclass); |
2145 | if (!error) | |
2146 | error = sysdev_register(&device_lapic); | |
2147 | return error; | |
1da177e4 | 2148 | } |
b24696bc FY |
2149 | |
2150 | /* local apic needs to resume before other devices access its registers. */ | |
2151 | core_initcall(init_lapic_sysfs); | |
0e078e2f TG |
2152 | |
2153 | #else /* CONFIG_PM */ | |
2154 | ||
2155 | static void apic_pm_activate(void) { } | |
2156 | ||
2157 | #endif /* CONFIG_PM */ | |
1da177e4 | 2158 | |
f28c0ae2 | 2159 | #ifdef CONFIG_X86_64 |
e0e42142 YL |
2160 | |
2161 | static int __cpuinit apic_cluster_num(void) | |
1da177e4 LT |
2162 | { |
2163 | int i, clusters, zeros; | |
2164 | unsigned id; | |
322850af | 2165 | u16 *bios_cpu_apicid; |
1da177e4 LT |
2166 | DECLARE_BITMAP(clustermap, NUM_APIC_CLUSTERS); |
2167 | ||
23ca4bba | 2168 | bios_cpu_apicid = early_per_cpu_ptr(x86_bios_cpu_apicid); |
376ec33f | 2169 | bitmap_zero(clustermap, NUM_APIC_CLUSTERS); |
1da177e4 | 2170 | |
168ef543 | 2171 | for (i = 0; i < nr_cpu_ids; i++) { |
e8c10ef9 | 2172 | /* are we being called early in kernel startup? */ |
693e3c56 MT |
2173 | if (bios_cpu_apicid) { |
2174 | id = bios_cpu_apicid[i]; | |
e423e33e | 2175 | } else if (i < nr_cpu_ids) { |
e8c10ef9 | 2176 | if (cpu_present(i)) |
2177 | id = per_cpu(x86_bios_cpu_apicid, i); | |
2178 | else | |
2179 | continue; | |
e423e33e | 2180 | } else |
e8c10ef9 | 2181 | break; |
2182 | ||
1da177e4 LT |
2183 | if (id != BAD_APICID) |
2184 | __set_bit(APIC_CLUSTERID(id), clustermap); | |
2185 | } | |
2186 | ||
2187 | /* Problem: Partially populated chassis may not have CPUs in some of | |
2188 | * the APIC clusters they have been allocated. Only present CPUs have | |
602a54a8 | 2189 | * x86_bios_cpu_apicid entries, thus causing zeroes in the bitmap. |
2190 | * Since clusters are allocated sequentially, count zeros only if | |
2191 | * they are bounded by ones. | |
1da177e4 LT |
2192 | */ |
2193 | clusters = 0; | |
2194 | zeros = 0; | |
2195 | for (i = 0; i < NUM_APIC_CLUSTERS; i++) { | |
2196 | if (test_bit(i, clustermap)) { | |
2197 | clusters += 1 + zeros; | |
2198 | zeros = 0; | |
2199 | } else | |
2200 | ++zeros; | |
2201 | } | |
2202 | ||
e0e42142 YL |
2203 | return clusters; |
2204 | } | |
2205 | ||
2206 | static int __cpuinitdata multi_checked; | |
2207 | static int __cpuinitdata multi; | |
2208 | ||
2209 | static int __cpuinit set_multi(const struct dmi_system_id *d) | |
2210 | { | |
2211 | if (multi) | |
2212 | return 0; | |
6f0aced6 | 2213 | pr_info("APIC: %s detected, Multi Chassis\n", d->ident); |
e0e42142 YL |
2214 | multi = 1; |
2215 | return 0; | |
2216 | } | |
2217 | ||
2218 | static const __cpuinitconst struct dmi_system_id multi_dmi_table[] = { | |
2219 | { | |
2220 | .callback = set_multi, | |
2221 | .ident = "IBM System Summit2", | |
2222 | .matches = { | |
2223 | DMI_MATCH(DMI_SYS_VENDOR, "IBM"), | |
2224 | DMI_MATCH(DMI_PRODUCT_NAME, "Summit2"), | |
2225 | }, | |
2226 | }, | |
2227 | {} | |
2228 | }; | |
2229 | ||
2230 | static void __cpuinit dmi_check_multi(void) | |
2231 | { | |
2232 | if (multi_checked) | |
2233 | return; | |
2234 | ||
2235 | dmi_check_system(multi_dmi_table); | |
2236 | multi_checked = 1; | |
2237 | } | |
2238 | ||
2239 | /* | |
2240 | * apic_is_clustered_box() -- Check if we can expect good TSC | |
2241 | * | |
2242 | * Thus far, the major user of this is IBM's Summit2 series: | |
2243 | * Clustered boxes may have unsynced TSC problems if they are | |
2244 | * multi-chassis. | |
2245 | * Use DMI to check them | |
2246 | */ | |
2247 | __cpuinit int apic_is_clustered_box(void) | |
2248 | { | |
2249 | dmi_check_multi(); | |
2250 | if (multi) | |
1cb68487 RT |
2251 | return 1; |
2252 | ||
e0e42142 YL |
2253 | if (!is_vsmp_box()) |
2254 | return 0; | |
2255 | ||
1da177e4 | 2256 | /* |
e0e42142 YL |
2257 | * ScaleMP vSMPowered boxes have one cluster per board and TSCs are |
2258 | * not guaranteed to be synced between boards | |
1da177e4 | 2259 | */ |
e0e42142 YL |
2260 | if (apic_cluster_num() > 1) |
2261 | return 1; | |
2262 | ||
2263 | return 0; | |
1da177e4 | 2264 | } |
f28c0ae2 | 2265 | #endif |
1da177e4 LT |
2266 | |
2267 | /* | |
0e078e2f | 2268 | * APIC command line parameters |
1da177e4 | 2269 | */ |
789fa735 | 2270 | static int __init setup_disableapic(char *arg) |
6935d1f9 | 2271 | { |
1da177e4 | 2272 | disable_apic = 1; |
9175fc06 | 2273 | setup_clear_cpu_cap(X86_FEATURE_APIC); |
2c8c0e6b AK |
2274 | return 0; |
2275 | } | |
2276 | early_param("disableapic", setup_disableapic); | |
1da177e4 | 2277 | |
2c8c0e6b | 2278 | /* same as disableapic, for compatibility */ |
789fa735 | 2279 | static int __init setup_nolapic(char *arg) |
6935d1f9 | 2280 | { |
789fa735 | 2281 | return setup_disableapic(arg); |
6935d1f9 | 2282 | } |
2c8c0e6b | 2283 | early_param("nolapic", setup_nolapic); |
1da177e4 | 2284 | |
2e7c2838 LT |
2285 | static int __init parse_lapic_timer_c2_ok(char *arg) |
2286 | { | |
2287 | local_apic_timer_c2_ok = 1; | |
2288 | return 0; | |
2289 | } | |
2290 | early_param("lapic_timer_c2_ok", parse_lapic_timer_c2_ok); | |
2291 | ||
36fef094 | 2292 | static int __init parse_disable_apic_timer(char *arg) |
6935d1f9 | 2293 | { |
1da177e4 | 2294 | disable_apic_timer = 1; |
36fef094 | 2295 | return 0; |
6935d1f9 | 2296 | } |
36fef094 CG |
2297 | early_param("noapictimer", parse_disable_apic_timer); |
2298 | ||
2299 | static int __init parse_nolapic_timer(char *arg) | |
2300 | { | |
2301 | disable_apic_timer = 1; | |
2302 | return 0; | |
6935d1f9 | 2303 | } |
36fef094 | 2304 | early_param("nolapic_timer", parse_nolapic_timer); |
73dea47f | 2305 | |
79af9bec CG |
2306 | static int __init apic_set_verbosity(char *arg) |
2307 | { | |
2308 | if (!arg) { | |
2309 | #ifdef CONFIG_X86_64 | |
2310 | skip_ioapic_setup = 0; | |
79af9bec CG |
2311 | return 0; |
2312 | #endif | |
2313 | return -EINVAL; | |
2314 | } | |
2315 | ||
2316 | if (strcmp("debug", arg) == 0) | |
2317 | apic_verbosity = APIC_DEBUG; | |
2318 | else if (strcmp("verbose", arg) == 0) | |
2319 | apic_verbosity = APIC_VERBOSE; | |
2320 | else { | |
ba21ebb6 | 2321 | pr_warning("APIC Verbosity level %s not recognised" |
79af9bec CG |
2322 | " use apic=verbose or apic=debug\n", arg); |
2323 | return -EINVAL; | |
2324 | } | |
2325 | ||
2326 | return 0; | |
2327 | } | |
2328 | early_param("apic", apic_set_verbosity); | |
2329 | ||
1e934dda YL |
2330 | static int __init lapic_insert_resource(void) |
2331 | { | |
2332 | if (!apic_phys) | |
2333 | return -1; | |
2334 | ||
2335 | /* Put local APIC into the resource map. */ | |
2336 | lapic_resource.start = apic_phys; | |
2337 | lapic_resource.end = lapic_resource.start + PAGE_SIZE - 1; | |
2338 | insert_resource(&iomem_resource, &lapic_resource); | |
2339 | ||
2340 | return 0; | |
2341 | } | |
2342 | ||
2343 | /* | |
2344 | * need call insert after e820_reserve_resources() | |
2345 | * that is using request_resource | |
2346 | */ | |
2347 | late_initcall(lapic_insert_resource); |