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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 | ||
cdd6c482 | 17 | #include <linux/perf_event.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> |
f3c6ea1b | 27 | #include <linux/syscore_ops.h> |
d1de36f5 IM |
28 | #include <linux/delay.h> |
29 | #include <linux/timex.h> | |
334955ef | 30 | #include <linux/i8253.h> |
6e1cb38a | 31 | #include <linux/dmar.h> |
d1de36f5 IM |
32 | #include <linux/init.h> |
33 | #include <linux/cpu.h> | |
34 | #include <linux/dmi.h> | |
d1de36f5 IM |
35 | #include <linux/smp.h> |
36 | #include <linux/mm.h> | |
1da177e4 | 37 | |
8a8f422d | 38 | #include <asm/irq_remapping.h> |
cdd6c482 | 39 | #include <asm/perf_event.h> |
736decac | 40 | #include <asm/x86_init.h> |
1da177e4 | 41 | #include <asm/pgalloc.h> |
60063497 | 42 | #include <linux/atomic.h> |
1da177e4 | 43 | #include <asm/mpspec.h> |
d1de36f5 | 44 | #include <asm/i8259.h> |
73dea47f | 45 | #include <asm/proto.h> |
2c8c0e6b | 46 | #include <asm/apic.h> |
7167d08e | 47 | #include <asm/io_apic.h> |
d1de36f5 IM |
48 | #include <asm/desc.h> |
49 | #include <asm/hpet.h> | |
50 | #include <asm/idle.h> | |
51 | #include <asm/mtrr.h> | |
16f871bc | 52 | #include <asm/time.h> |
2bc13797 | 53 | #include <asm/smp.h> |
be71b855 | 54 | #include <asm/mce.h> |
8c3ba8d0 | 55 | #include <asm/tsc.h> |
2904ed8d | 56 | #include <asm/hypervisor.h> |
1da177e4 | 57 | |
cf910e83 SA |
58 | #define CREATE_TRACE_POINTS |
59 | #include <asm/trace/irq_vectors.h> | |
60 | ||
ec70de8b | 61 | unsigned int num_processors; |
fdbecd9f | 62 | |
ec70de8b | 63 | unsigned disabled_cpus __cpuinitdata; |
fdbecd9f | 64 | |
ec70de8b BG |
65 | /* Processor that is doing the boot up */ |
66 | unsigned int boot_cpu_physical_apicid = -1U; | |
5af5573e | 67 | |
80e5609c | 68 | /* |
fdbecd9f | 69 | * The highest APIC ID seen during enumeration. |
80e5609c | 70 | */ |
ec70de8b | 71 | unsigned int max_physical_apicid; |
5af5573e | 72 | |
80e5609c | 73 | /* |
fdbecd9f | 74 | * Bitmask of physically existing CPUs: |
80e5609c | 75 | */ |
ec70de8b BG |
76 | physid_mask_t phys_cpu_present_map; |
77 | ||
78 | /* | |
79 | * Map cpu index to physical APIC ID | |
80 | */ | |
0816b0f0 VZ |
81 | DEFINE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_cpu_to_apicid, BAD_APICID); |
82 | DEFINE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_bios_cpu_apicid, BAD_APICID); | |
ec70de8b BG |
83 | EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid); |
84 | EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid); | |
80e5609c | 85 | |
b3c51170 | 86 | #ifdef CONFIG_X86_32 |
4c321ff8 | 87 | |
4c321ff8 TH |
88 | /* |
89 | * On x86_32, the mapping between cpu and logical apicid may vary | |
90 | * depending on apic in use. The following early percpu variable is | |
91 | * used for the mapping. This is where the behaviors of x86_64 and 32 | |
92 | * actually diverge. Let's keep it ugly for now. | |
93 | */ | |
0816b0f0 | 94 | DEFINE_EARLY_PER_CPU_READ_MOSTLY(int, x86_cpu_to_logical_apicid, BAD_APICID); |
4c321ff8 | 95 | |
f28c0ae2 YL |
96 | /* Local APIC was disabled by the BIOS and enabled by the kernel */ |
97 | static int enabled_via_apicbase; | |
98 | ||
c0eaa453 CG |
99 | /* |
100 | * Handle interrupt mode configuration register (IMCR). | |
101 | * This register controls whether the interrupt signals | |
102 | * that reach the BSP come from the master PIC or from the | |
103 | * local APIC. Before entering Symmetric I/O Mode, either | |
104 | * the BIOS or the operating system must switch out of | |
105 | * PIC Mode by changing the IMCR. | |
106 | */ | |
5cda395f | 107 | static inline void imcr_pic_to_apic(void) |
c0eaa453 CG |
108 | { |
109 | /* select IMCR register */ | |
110 | outb(0x70, 0x22); | |
111 | /* NMI and 8259 INTR go through APIC */ | |
112 | outb(0x01, 0x23); | |
113 | } | |
114 | ||
5cda395f | 115 | static inline void imcr_apic_to_pic(void) |
c0eaa453 CG |
116 | { |
117 | /* select IMCR register */ | |
118 | outb(0x70, 0x22); | |
119 | /* NMI and 8259 INTR go directly to BSP */ | |
120 | outb(0x00, 0x23); | |
121 | } | |
b3c51170 YL |
122 | #endif |
123 | ||
279f1461 SS |
124 | /* |
125 | * Knob to control our willingness to enable the local APIC. | |
126 | * | |
127 | * +1=force-enable | |
128 | */ | |
129 | static int force_enable_local_apic __initdata; | |
130 | /* | |
131 | * APIC command line parameters | |
132 | */ | |
133 | static int __init parse_lapic(char *arg) | |
134 | { | |
135 | if (config_enabled(CONFIG_X86_32) && !arg) | |
136 | force_enable_local_apic = 1; | |
27cf9298 | 137 | else if (arg && !strncmp(arg, "notscdeadline", 13)) |
279f1461 SS |
138 | setup_clear_cpu_cap(X86_FEATURE_TSC_DEADLINE_TIMER); |
139 | return 0; | |
140 | } | |
141 | early_param("lapic", parse_lapic); | |
142 | ||
b3c51170 | 143 | #ifdef CONFIG_X86_64 |
bc1d99c1 | 144 | static int apic_calibrate_pmtmr __initdata; |
b3c51170 YL |
145 | static __init int setup_apicpmtimer(char *s) |
146 | { | |
147 | apic_calibrate_pmtmr = 1; | |
148 | notsc_setup(NULL); | |
149 | return 0; | |
150 | } | |
151 | __setup("apicpmtimer", setup_apicpmtimer); | |
152 | #endif | |
153 | ||
fc1edaf9 | 154 | int x2apic_mode; |
06cd9a7d | 155 | #ifdef CONFIG_X86_X2APIC |
6e1cb38a | 156 | /* x2apic enabled before OS handover */ |
fb209bd8 YL |
157 | int x2apic_preenabled; |
158 | static int x2apic_disabled; | |
a31bc327 | 159 | static int nox2apic; |
49899eac YL |
160 | static __init int setup_nox2apic(char *str) |
161 | { | |
39d83a5d | 162 | if (x2apic_enabled()) { |
a31bc327 YL |
163 | int apicid = native_apic_msr_read(APIC_ID); |
164 | ||
165 | if (apicid >= 255) { | |
166 | pr_warning("Apicid: %08x, cannot enforce nox2apic\n", | |
167 | apicid); | |
168 | return 0; | |
169 | } | |
170 | ||
171 | pr_warning("x2apic already enabled. will disable it\n"); | |
172 | } else | |
173 | setup_clear_cpu_cap(X86_FEATURE_X2APIC); | |
174 | ||
175 | nox2apic = 1; | |
39d83a5d | 176 | |
49899eac YL |
177 | return 0; |
178 | } | |
179 | early_param("nox2apic", setup_nox2apic); | |
180 | #endif | |
1da177e4 | 181 | |
b3c51170 YL |
182 | unsigned long mp_lapic_addr; |
183 | int disable_apic; | |
184 | /* Disable local APIC timer from the kernel commandline or via dmi quirk */ | |
25874a29 | 185 | static int disable_apic_timer __initdata; |
e83a5fdc | 186 | /* Local APIC timer works in C2 */ |
2e7c2838 LT |
187 | int local_apic_timer_c2_ok; |
188 | EXPORT_SYMBOL_GPL(local_apic_timer_c2_ok); | |
189 | ||
efa2559f YL |
190 | int first_system_vector = 0xfe; |
191 | ||
e83a5fdc HS |
192 | /* |
193 | * Debug level, exported for io_apic.c | |
194 | */ | |
baa13188 | 195 | unsigned int apic_verbosity; |
e83a5fdc | 196 | |
89c38c28 CG |
197 | int pic_mode; |
198 | ||
bab4b27c AS |
199 | /* Have we found an MP table */ |
200 | int smp_found_config; | |
201 | ||
39928722 AD |
202 | static struct resource lapic_resource = { |
203 | .name = "Local APIC", | |
204 | .flags = IORESOURCE_MEM | IORESOURCE_BUSY, | |
205 | }; | |
206 | ||
1ade93ef | 207 | unsigned int lapic_timer_frequency = 0; |
d03030e9 | 208 | |
0e078e2f | 209 | static void apic_pm_activate(void); |
ba7eda4c | 210 | |
d3432896 AK |
211 | static unsigned long apic_phys; |
212 | ||
0e078e2f TG |
213 | /* |
214 | * Get the LAPIC version | |
215 | */ | |
216 | static inline int lapic_get_version(void) | |
ba7eda4c | 217 | { |
0e078e2f | 218 | return GET_APIC_VERSION(apic_read(APIC_LVR)); |
ba7eda4c TG |
219 | } |
220 | ||
0e078e2f | 221 | /* |
9c803869 | 222 | * Check, if the APIC is integrated or a separate chip |
0e078e2f TG |
223 | */ |
224 | static inline int lapic_is_integrated(void) | |
ba7eda4c | 225 | { |
9c803869 | 226 | #ifdef CONFIG_X86_64 |
0e078e2f | 227 | return 1; |
9c803869 CG |
228 | #else |
229 | return APIC_INTEGRATED(lapic_get_version()); | |
230 | #endif | |
ba7eda4c TG |
231 | } |
232 | ||
233 | /* | |
0e078e2f | 234 | * Check, whether this is a modern or a first generation APIC |
ba7eda4c | 235 | */ |
0e078e2f | 236 | static int modern_apic(void) |
ba7eda4c | 237 | { |
0e078e2f TG |
238 | /* AMD systems use old APIC versions, so check the CPU */ |
239 | if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD && | |
240 | boot_cpu_data.x86 >= 0xf) | |
241 | return 1; | |
242 | return lapic_get_version() >= 0x14; | |
ba7eda4c TG |
243 | } |
244 | ||
08306ce6 | 245 | /* |
a933c618 CG |
246 | * right after this call apic become NOOP driven |
247 | * so apic->write/read doesn't do anything | |
08306ce6 | 248 | */ |
25874a29 | 249 | static void __init apic_disable(void) |
08306ce6 | 250 | { |
f88f2b4f | 251 | pr_info("APIC: switched to apic NOOP\n"); |
a933c618 | 252 | apic = &apic_noop; |
08306ce6 CG |
253 | } |
254 | ||
c1eeb2de | 255 | void native_apic_wait_icr_idle(void) |
8339e9fb FLV |
256 | { |
257 | while (apic_read(APIC_ICR) & APIC_ICR_BUSY) | |
258 | cpu_relax(); | |
259 | } | |
260 | ||
c1eeb2de | 261 | u32 native_safe_apic_wait_icr_idle(void) |
8339e9fb | 262 | { |
3c6bb07a | 263 | u32 send_status; |
8339e9fb FLV |
264 | int timeout; |
265 | ||
266 | timeout = 0; | |
267 | do { | |
268 | send_status = apic_read(APIC_ICR) & APIC_ICR_BUSY; | |
269 | if (!send_status) | |
270 | break; | |
b49d7d87 | 271 | inc_irq_stat(icr_read_retry_count); |
8339e9fb FLV |
272 | udelay(100); |
273 | } while (timeout++ < 1000); | |
274 | ||
275 | return send_status; | |
276 | } | |
277 | ||
c1eeb2de | 278 | void native_apic_icr_write(u32 low, u32 id) |
1b374e4d | 279 | { |
ed4e5ec1 | 280 | apic_write(APIC_ICR2, SET_APIC_DEST_FIELD(id)); |
1b374e4d SS |
281 | apic_write(APIC_ICR, low); |
282 | } | |
283 | ||
c1eeb2de | 284 | u64 native_apic_icr_read(void) |
1b374e4d SS |
285 | { |
286 | u32 icr1, icr2; | |
287 | ||
288 | icr2 = apic_read(APIC_ICR2); | |
289 | icr1 = apic_read(APIC_ICR); | |
290 | ||
cf9768d7 | 291 | return icr1 | ((u64)icr2 << 32); |
1b374e4d SS |
292 | } |
293 | ||
7c37e48b CG |
294 | #ifdef CONFIG_X86_32 |
295 | /** | |
296 | * get_physical_broadcast - Get number of physical broadcast IDs | |
297 | */ | |
298 | int get_physical_broadcast(void) | |
299 | { | |
300 | return modern_apic() ? 0xff : 0xf; | |
301 | } | |
302 | #endif | |
303 | ||
0e078e2f TG |
304 | /** |
305 | * lapic_get_maxlvt - get the maximum number of local vector table entries | |
306 | */ | |
37e650c7 | 307 | int lapic_get_maxlvt(void) |
1da177e4 | 308 | { |
36a028de | 309 | unsigned int v; |
1da177e4 LT |
310 | |
311 | v = apic_read(APIC_LVR); | |
36a028de CG |
312 | /* |
313 | * - we always have APIC integrated on 64bit mode | |
314 | * - 82489DXs do not report # of LVT entries | |
315 | */ | |
316 | return APIC_INTEGRATED(GET_APIC_VERSION(v)) ? GET_APIC_MAXLVT(v) : 2; | |
1da177e4 LT |
317 | } |
318 | ||
274cfe59 CG |
319 | /* |
320 | * Local APIC timer | |
321 | */ | |
322 | ||
c40aaec6 | 323 | /* Clock divisor */ |
c40aaec6 | 324 | #define APIC_DIVISOR 16 |
279f1461 | 325 | #define TSC_DIVISOR 32 |
f07f4f90 | 326 | |
0e078e2f TG |
327 | /* |
328 | * This function sets up the local APIC timer, with a timeout of | |
329 | * 'clocks' APIC bus clock. During calibration we actually call | |
330 | * this function twice on the boot CPU, once with a bogus timeout | |
331 | * value, second time for real. The other (noncalibrating) CPUs | |
332 | * call this function only once, with the real, calibrated value. | |
333 | * | |
334 | * We do reads before writes even if unnecessary, to get around the | |
335 | * P5 APIC double write bug. | |
336 | */ | |
0e078e2f | 337 | static void __setup_APIC_LVTT(unsigned int clocks, int oneshot, int irqen) |
1da177e4 | 338 | { |
0e078e2f | 339 | unsigned int lvtt_value, tmp_value; |
1da177e4 | 340 | |
0e078e2f TG |
341 | lvtt_value = LOCAL_TIMER_VECTOR; |
342 | if (!oneshot) | |
343 | lvtt_value |= APIC_LVT_TIMER_PERIODIC; | |
279f1461 SS |
344 | else if (boot_cpu_has(X86_FEATURE_TSC_DEADLINE_TIMER)) |
345 | lvtt_value |= APIC_LVT_TIMER_TSCDEADLINE; | |
346 | ||
f07f4f90 CG |
347 | if (!lapic_is_integrated()) |
348 | lvtt_value |= SET_APIC_TIMER_BASE(APIC_TIMER_BASE_DIV); | |
349 | ||
0e078e2f TG |
350 | if (!irqen) |
351 | lvtt_value |= APIC_LVT_MASKED; | |
1da177e4 | 352 | |
0e078e2f | 353 | apic_write(APIC_LVTT, lvtt_value); |
1da177e4 | 354 | |
279f1461 SS |
355 | if (lvtt_value & APIC_LVT_TIMER_TSCDEADLINE) { |
356 | printk_once(KERN_DEBUG "TSC deadline timer enabled\n"); | |
357 | return; | |
358 | } | |
359 | ||
1da177e4 | 360 | /* |
0e078e2f | 361 | * Divide PICLK by 16 |
1da177e4 | 362 | */ |
0e078e2f | 363 | tmp_value = apic_read(APIC_TDCR); |
c40aaec6 CG |
364 | apic_write(APIC_TDCR, |
365 | (tmp_value & ~(APIC_TDR_DIV_1 | APIC_TDR_DIV_TMBASE)) | | |
366 | APIC_TDR_DIV_16); | |
0e078e2f TG |
367 | |
368 | if (!oneshot) | |
f07f4f90 | 369 | apic_write(APIC_TMICT, clocks / APIC_DIVISOR); |
1da177e4 LT |
370 | } |
371 | ||
0e078e2f | 372 | /* |
a68c439b | 373 | * Setup extended LVT, AMD specific |
7b83dae7 | 374 | * |
a68c439b RR |
375 | * Software should use the LVT offsets the BIOS provides. The offsets |
376 | * are determined by the subsystems using it like those for MCE | |
377 | * threshold or IBS. On K8 only offset 0 (APIC500) and MCE interrupts | |
378 | * are supported. Beginning with family 10h at least 4 offsets are | |
379 | * available. | |
286f5718 | 380 | * |
a68c439b RR |
381 | * Since the offsets must be consistent for all cores, we keep track |
382 | * of the LVT offsets in software and reserve the offset for the same | |
383 | * vector also to be used on other cores. An offset is freed by | |
384 | * setting the entry to APIC_EILVT_MASKED. | |
385 | * | |
386 | * If the BIOS is right, there should be no conflicts. Otherwise a | |
387 | * "[Firmware Bug]: ..." error message is generated. However, if | |
388 | * software does not properly determines the offsets, it is not | |
389 | * necessarily a BIOS bug. | |
0e078e2f | 390 | */ |
7b83dae7 | 391 | |
a68c439b RR |
392 | static atomic_t eilvt_offsets[APIC_EILVT_NR_MAX]; |
393 | ||
394 | static inline int eilvt_entry_is_changeable(unsigned int old, unsigned int new) | |
395 | { | |
396 | return (old & APIC_EILVT_MASKED) | |
397 | || (new == APIC_EILVT_MASKED) | |
398 | || ((new & ~APIC_EILVT_MASKED) == old); | |
399 | } | |
400 | ||
401 | static unsigned int reserve_eilvt_offset(int offset, unsigned int new) | |
402 | { | |
8abc3122 | 403 | unsigned int rsvd, vector; |
a68c439b RR |
404 | |
405 | if (offset >= APIC_EILVT_NR_MAX) | |
406 | return ~0; | |
407 | ||
8abc3122 | 408 | rsvd = atomic_read(&eilvt_offsets[offset]); |
a68c439b | 409 | do { |
8abc3122 RR |
410 | vector = rsvd & ~APIC_EILVT_MASKED; /* 0: unassigned */ |
411 | if (vector && !eilvt_entry_is_changeable(vector, new)) | |
a68c439b RR |
412 | /* may not change if vectors are different */ |
413 | return rsvd; | |
414 | rsvd = atomic_cmpxchg(&eilvt_offsets[offset], rsvd, new); | |
415 | } while (rsvd != new); | |
416 | ||
8abc3122 RR |
417 | rsvd &= ~APIC_EILVT_MASKED; |
418 | if (rsvd && rsvd != vector) | |
419 | pr_info("LVT offset %d assigned for vector 0x%02x\n", | |
420 | offset, rsvd); | |
421 | ||
a68c439b RR |
422 | return new; |
423 | } | |
424 | ||
425 | /* | |
426 | * If mask=1, the LVT entry does not generate interrupts while mask=0 | |
cbf74cea RR |
427 | * enables the vector. See also the BKDGs. Must be called with |
428 | * preemption disabled. | |
a68c439b RR |
429 | */ |
430 | ||
27afdf20 | 431 | int setup_APIC_eilvt(u8 offset, u8 vector, u8 msg_type, u8 mask) |
1da177e4 | 432 | { |
a68c439b RR |
433 | unsigned long reg = APIC_EILVTn(offset); |
434 | unsigned int new, old, reserved; | |
435 | ||
436 | new = (mask << 16) | (msg_type << 8) | vector; | |
437 | old = apic_read(reg); | |
438 | reserved = reserve_eilvt_offset(offset, new); | |
439 | ||
440 | if (reserved != new) { | |
eb48c9cb RR |
441 | pr_err(FW_BUG "cpu %d, try to use APIC%lX (LVT offset %d) for " |
442 | "vector 0x%x, but the register is already in use for " | |
443 | "vector 0x%x on another cpu\n", | |
444 | smp_processor_id(), reg, offset, new, reserved); | |
a68c439b RR |
445 | return -EINVAL; |
446 | } | |
447 | ||
448 | if (!eilvt_entry_is_changeable(old, new)) { | |
eb48c9cb RR |
449 | pr_err(FW_BUG "cpu %d, try to use APIC%lX (LVT offset %d) for " |
450 | "vector 0x%x, but the register is already in use for " | |
451 | "vector 0x%x on this cpu\n", | |
452 | smp_processor_id(), reg, offset, new, old); | |
a68c439b RR |
453 | return -EBUSY; |
454 | } | |
455 | ||
456 | apic_write(reg, new); | |
a8fcf1a2 | 457 | |
a68c439b | 458 | return 0; |
1da177e4 | 459 | } |
27afdf20 | 460 | EXPORT_SYMBOL_GPL(setup_APIC_eilvt); |
7b83dae7 | 461 | |
0e078e2f TG |
462 | /* |
463 | * Program the next event, relative to now | |
464 | */ | |
465 | static int lapic_next_event(unsigned long delta, | |
466 | struct clock_event_device *evt) | |
1da177e4 | 467 | { |
0e078e2f TG |
468 | apic_write(APIC_TMICT, delta); |
469 | return 0; | |
1da177e4 LT |
470 | } |
471 | ||
279f1461 SS |
472 | static int lapic_next_deadline(unsigned long delta, |
473 | struct clock_event_device *evt) | |
474 | { | |
475 | u64 tsc; | |
476 | ||
477 | rdtscll(tsc); | |
478 | wrmsrl(MSR_IA32_TSC_DEADLINE, tsc + (((u64) delta) * TSC_DIVISOR)); | |
479 | return 0; | |
480 | } | |
481 | ||
0e078e2f TG |
482 | /* |
483 | * Setup the lapic timer in periodic or oneshot mode | |
484 | */ | |
485 | static void lapic_timer_setup(enum clock_event_mode mode, | |
486 | struct clock_event_device *evt) | |
9b7711f0 HS |
487 | { |
488 | unsigned long flags; | |
0e078e2f | 489 | unsigned int v; |
9b7711f0 | 490 | |
0e078e2f TG |
491 | /* Lapic used as dummy for broadcast ? */ |
492 | if (evt->features & CLOCK_EVT_FEAT_DUMMY) | |
9b7711f0 HS |
493 | return; |
494 | ||
495 | local_irq_save(flags); | |
496 | ||
0e078e2f TG |
497 | switch (mode) { |
498 | case CLOCK_EVT_MODE_PERIODIC: | |
499 | case CLOCK_EVT_MODE_ONESHOT: | |
1ade93ef | 500 | __setup_APIC_LVTT(lapic_timer_frequency, |
0e078e2f TG |
501 | mode != CLOCK_EVT_MODE_PERIODIC, 1); |
502 | break; | |
503 | case CLOCK_EVT_MODE_UNUSED: | |
504 | case CLOCK_EVT_MODE_SHUTDOWN: | |
505 | v = apic_read(APIC_LVTT); | |
506 | v |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR); | |
507 | apic_write(APIC_LVTT, v); | |
6f9b4100 | 508 | apic_write(APIC_TMICT, 0); |
0e078e2f TG |
509 | break; |
510 | case CLOCK_EVT_MODE_RESUME: | |
511 | /* Nothing to do here */ | |
512 | break; | |
513 | } | |
9b7711f0 HS |
514 | |
515 | local_irq_restore(flags); | |
516 | } | |
517 | ||
1da177e4 | 518 | /* |
0e078e2f | 519 | * Local APIC timer broadcast function |
1da177e4 | 520 | */ |
9628937d | 521 | static void lapic_timer_broadcast(const struct cpumask *mask) |
1da177e4 | 522 | { |
0e078e2f | 523 | #ifdef CONFIG_SMP |
dac5f412 | 524 | apic->send_IPI_mask(mask, LOCAL_TIMER_VECTOR); |
0e078e2f TG |
525 | #endif |
526 | } | |
1da177e4 | 527 | |
25874a29 HK |
528 | |
529 | /* | |
530 | * The local apic timer can be used for any function which is CPU local. | |
531 | */ | |
532 | static struct clock_event_device lapic_clockevent = { | |
533 | .name = "lapic", | |
534 | .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT | |
535 | | CLOCK_EVT_FEAT_C3STOP | CLOCK_EVT_FEAT_DUMMY, | |
536 | .shift = 32, | |
537 | .set_mode = lapic_timer_setup, | |
538 | .set_next_event = lapic_next_event, | |
539 | .broadcast = lapic_timer_broadcast, | |
540 | .rating = 100, | |
541 | .irq = -1, | |
542 | }; | |
543 | static DEFINE_PER_CPU(struct clock_event_device, lapic_events); | |
544 | ||
0e078e2f | 545 | /* |
421f91d2 | 546 | * Setup the local APIC timer for this CPU. Copy the initialized values |
0e078e2f TG |
547 | * of the boot CPU and register the clock event in the framework. |
548 | */ | |
db4b5525 | 549 | static void __cpuinit setup_APIC_timer(void) |
0e078e2f TG |
550 | { |
551 | struct clock_event_device *levt = &__get_cpu_var(lapic_events); | |
1da177e4 | 552 | |
349c004e | 553 | if (this_cpu_has(X86_FEATURE_ARAT)) { |
db954b58 VP |
554 | lapic_clockevent.features &= ~CLOCK_EVT_FEAT_C3STOP; |
555 | /* Make LAPIC timer preferrable over percpu HPET */ | |
556 | lapic_clockevent.rating = 150; | |
557 | } | |
558 | ||
0e078e2f | 559 | memcpy(levt, &lapic_clockevent, sizeof(*levt)); |
320ab2b0 | 560 | levt->cpumask = cpumask_of(smp_processor_id()); |
1da177e4 | 561 | |
279f1461 SS |
562 | if (this_cpu_has(X86_FEATURE_TSC_DEADLINE_TIMER)) { |
563 | levt->features &= ~(CLOCK_EVT_FEAT_PERIODIC | | |
564 | CLOCK_EVT_FEAT_DUMMY); | |
565 | levt->set_next_event = lapic_next_deadline; | |
566 | clockevents_config_and_register(levt, | |
567 | (tsc_khz / TSC_DIVISOR) * 1000, | |
568 | 0xF, ~0UL); | |
569 | } else | |
570 | clockevents_register_device(levt); | |
0e078e2f | 571 | } |
1da177e4 | 572 | |
2f04fa88 YL |
573 | /* |
574 | * In this functions we calibrate APIC bus clocks to the external timer. | |
575 | * | |
576 | * We want to do the calibration only once since we want to have local timer | |
577 | * irqs syncron. CPUs connected by the same APIC bus have the very same bus | |
578 | * frequency. | |
579 | * | |
580 | * This was previously done by reading the PIT/HPET and waiting for a wrap | |
581 | * around to find out, that a tick has elapsed. I have a box, where the PIT | |
582 | * readout is broken, so it never gets out of the wait loop again. This was | |
583 | * also reported by others. | |
584 | * | |
585 | * Monitoring the jiffies value is inaccurate and the clockevents | |
586 | * infrastructure allows us to do a simple substitution of the interrupt | |
587 | * handler. | |
588 | * | |
589 | * The calibration routine also uses the pm_timer when possible, as the PIT | |
590 | * happens to run way too slow (factor 2.3 on my VAIO CoreDuo, which goes | |
591 | * back to normal later in the boot process). | |
592 | */ | |
593 | ||
594 | #define LAPIC_CAL_LOOPS (HZ/10) | |
595 | ||
596 | static __initdata int lapic_cal_loops = -1; | |
597 | static __initdata long lapic_cal_t1, lapic_cal_t2; | |
598 | static __initdata unsigned long long lapic_cal_tsc1, lapic_cal_tsc2; | |
599 | static __initdata unsigned long lapic_cal_pm1, lapic_cal_pm2; | |
600 | static __initdata unsigned long lapic_cal_j1, lapic_cal_j2; | |
601 | ||
602 | /* | |
603 | * Temporary interrupt handler. | |
604 | */ | |
605 | static void __init lapic_cal_handler(struct clock_event_device *dev) | |
606 | { | |
607 | unsigned long long tsc = 0; | |
608 | long tapic = apic_read(APIC_TMCCT); | |
609 | unsigned long pm = acpi_pm_read_early(); | |
610 | ||
611 | if (cpu_has_tsc) | |
612 | rdtscll(tsc); | |
613 | ||
614 | switch (lapic_cal_loops++) { | |
615 | case 0: | |
616 | lapic_cal_t1 = tapic; | |
617 | lapic_cal_tsc1 = tsc; | |
618 | lapic_cal_pm1 = pm; | |
619 | lapic_cal_j1 = jiffies; | |
620 | break; | |
621 | ||
622 | case LAPIC_CAL_LOOPS: | |
623 | lapic_cal_t2 = tapic; | |
624 | lapic_cal_tsc2 = tsc; | |
625 | if (pm < lapic_cal_pm1) | |
626 | pm += ACPI_PM_OVRRUN; | |
627 | lapic_cal_pm2 = pm; | |
628 | lapic_cal_j2 = jiffies; | |
629 | break; | |
630 | } | |
631 | } | |
632 | ||
754ef0cd YI |
633 | static int __init |
634 | calibrate_by_pmtimer(long deltapm, long *delta, long *deltatsc) | |
b189892d CG |
635 | { |
636 | const long pm_100ms = PMTMR_TICKS_PER_SEC / 10; | |
637 | const long pm_thresh = pm_100ms / 100; | |
638 | unsigned long mult; | |
639 | u64 res; | |
640 | ||
641 | #ifndef CONFIG_X86_PM_TIMER | |
642 | return -1; | |
643 | #endif | |
644 | ||
39ba5d43 | 645 | apic_printk(APIC_VERBOSE, "... PM-Timer delta = %ld\n", deltapm); |
b189892d CG |
646 | |
647 | /* Check, if the PM timer is available */ | |
648 | if (!deltapm) | |
649 | return -1; | |
650 | ||
651 | mult = clocksource_hz2mult(PMTMR_TICKS_PER_SEC, 22); | |
652 | ||
653 | if (deltapm > (pm_100ms - pm_thresh) && | |
654 | deltapm < (pm_100ms + pm_thresh)) { | |
39ba5d43 | 655 | apic_printk(APIC_VERBOSE, "... PM-Timer result ok\n"); |
754ef0cd YI |
656 | return 0; |
657 | } | |
658 | ||
659 | res = (((u64)deltapm) * mult) >> 22; | |
660 | do_div(res, 1000000); | |
661 | pr_warning("APIC calibration not consistent " | |
39ba5d43 | 662 | "with PM-Timer: %ldms instead of 100ms\n",(long)res); |
754ef0cd YI |
663 | |
664 | /* Correct the lapic counter value */ | |
665 | res = (((u64)(*delta)) * pm_100ms); | |
666 | do_div(res, deltapm); | |
667 | pr_info("APIC delta adjusted to PM-Timer: " | |
668 | "%lu (%ld)\n", (unsigned long)res, *delta); | |
669 | *delta = (long)res; | |
670 | ||
671 | /* Correct the tsc counter value */ | |
672 | if (cpu_has_tsc) { | |
673 | res = (((u64)(*deltatsc)) * pm_100ms); | |
b189892d | 674 | do_div(res, deltapm); |
754ef0cd | 675 | apic_printk(APIC_VERBOSE, "TSC delta adjusted to " |
3235dc3f | 676 | "PM-Timer: %lu (%ld)\n", |
754ef0cd YI |
677 | (unsigned long)res, *deltatsc); |
678 | *deltatsc = (long)res; | |
b189892d CG |
679 | } |
680 | ||
681 | return 0; | |
682 | } | |
683 | ||
2f04fa88 YL |
684 | static int __init calibrate_APIC_clock(void) |
685 | { | |
686 | struct clock_event_device *levt = &__get_cpu_var(lapic_events); | |
2f04fa88 YL |
687 | void (*real_handler)(struct clock_event_device *dev); |
688 | unsigned long deltaj; | |
754ef0cd | 689 | long delta, deltatsc; |
2f04fa88 YL |
690 | int pm_referenced = 0; |
691 | ||
1ade93ef JP |
692 | /** |
693 | * check if lapic timer has already been calibrated by platform | |
694 | * specific routine, such as tsc calibration code. if so, we just fill | |
695 | * in the clockevent structure and return. | |
696 | */ | |
697 | ||
279f1461 SS |
698 | if (boot_cpu_has(X86_FEATURE_TSC_DEADLINE_TIMER)) { |
699 | return 0; | |
700 | } else if (lapic_timer_frequency) { | |
1ade93ef JP |
701 | apic_printk(APIC_VERBOSE, "lapic timer already calibrated %d\n", |
702 | lapic_timer_frequency); | |
703 | lapic_clockevent.mult = div_sc(lapic_timer_frequency/APIC_DIVISOR, | |
704 | TICK_NSEC, lapic_clockevent.shift); | |
705 | lapic_clockevent.max_delta_ns = | |
706 | clockevent_delta2ns(0x7FFFFF, &lapic_clockevent); | |
707 | lapic_clockevent.min_delta_ns = | |
708 | clockevent_delta2ns(0xF, &lapic_clockevent); | |
709 | lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY; | |
710 | return 0; | |
711 | } | |
712 | ||
279f1461 SS |
713 | apic_printk(APIC_VERBOSE, "Using local APIC timer interrupts.\n" |
714 | "calibrating APIC timer ...\n"); | |
715 | ||
2f04fa88 YL |
716 | local_irq_disable(); |
717 | ||
718 | /* Replace the global interrupt handler */ | |
719 | real_handler = global_clock_event->event_handler; | |
720 | global_clock_event->event_handler = lapic_cal_handler; | |
721 | ||
722 | /* | |
81608f3c | 723 | * Setup the APIC counter to maximum. There is no way the lapic |
2f04fa88 YL |
724 | * can underflow in the 100ms detection time frame |
725 | */ | |
81608f3c | 726 | __setup_APIC_LVTT(0xffffffff, 0, 0); |
2f04fa88 YL |
727 | |
728 | /* Let the interrupts run */ | |
729 | local_irq_enable(); | |
730 | ||
731 | while (lapic_cal_loops <= LAPIC_CAL_LOOPS) | |
732 | cpu_relax(); | |
733 | ||
734 | local_irq_disable(); | |
735 | ||
736 | /* Restore the real event handler */ | |
737 | global_clock_event->event_handler = real_handler; | |
738 | ||
739 | /* Build delta t1-t2 as apic timer counts down */ | |
740 | delta = lapic_cal_t1 - lapic_cal_t2; | |
741 | apic_printk(APIC_VERBOSE, "... lapic delta = %ld\n", delta); | |
742 | ||
754ef0cd YI |
743 | deltatsc = (long)(lapic_cal_tsc2 - lapic_cal_tsc1); |
744 | ||
b189892d CG |
745 | /* we trust the PM based calibration if possible */ |
746 | pm_referenced = !calibrate_by_pmtimer(lapic_cal_pm2 - lapic_cal_pm1, | |
754ef0cd | 747 | &delta, &deltatsc); |
2f04fa88 YL |
748 | |
749 | /* Calculate the scaled math multiplication factor */ | |
750 | lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS, | |
751 | lapic_clockevent.shift); | |
752 | lapic_clockevent.max_delta_ns = | |
4aed89d6 | 753 | clockevent_delta2ns(0x7FFFFFFF, &lapic_clockevent); |
2f04fa88 YL |
754 | lapic_clockevent.min_delta_ns = |
755 | clockevent_delta2ns(0xF, &lapic_clockevent); | |
756 | ||
1ade93ef | 757 | lapic_timer_frequency = (delta * APIC_DIVISOR) / LAPIC_CAL_LOOPS; |
2f04fa88 YL |
758 | |
759 | apic_printk(APIC_VERBOSE, "..... delta %ld\n", delta); | |
411462f6 | 760 | apic_printk(APIC_VERBOSE, "..... mult: %u\n", lapic_clockevent.mult); |
2f04fa88 | 761 | apic_printk(APIC_VERBOSE, "..... calibration result: %u\n", |
1ade93ef | 762 | lapic_timer_frequency); |
2f04fa88 YL |
763 | |
764 | if (cpu_has_tsc) { | |
2f04fa88 YL |
765 | apic_printk(APIC_VERBOSE, "..... CPU clock speed is " |
766 | "%ld.%04ld MHz.\n", | |
754ef0cd YI |
767 | (deltatsc / LAPIC_CAL_LOOPS) / (1000000 / HZ), |
768 | (deltatsc / LAPIC_CAL_LOOPS) % (1000000 / HZ)); | |
2f04fa88 YL |
769 | } |
770 | ||
771 | apic_printk(APIC_VERBOSE, "..... host bus clock speed is " | |
772 | "%u.%04u MHz.\n", | |
1ade93ef JP |
773 | lapic_timer_frequency / (1000000 / HZ), |
774 | lapic_timer_frequency % (1000000 / HZ)); | |
2f04fa88 YL |
775 | |
776 | /* | |
777 | * Do a sanity check on the APIC calibration result | |
778 | */ | |
1ade93ef | 779 | if (lapic_timer_frequency < (1000000 / HZ)) { |
2f04fa88 | 780 | local_irq_enable(); |
ba21ebb6 | 781 | pr_warning("APIC frequency too slow, disabling apic timer\n"); |
2f04fa88 YL |
782 | return -1; |
783 | } | |
784 | ||
785 | levt->features &= ~CLOCK_EVT_FEAT_DUMMY; | |
786 | ||
b189892d CG |
787 | /* |
788 | * PM timer calibration failed or not turned on | |
789 | * so lets try APIC timer based calibration | |
790 | */ | |
2f04fa88 YL |
791 | if (!pm_referenced) { |
792 | apic_printk(APIC_VERBOSE, "... verify APIC timer\n"); | |
793 | ||
794 | /* | |
795 | * Setup the apic timer manually | |
796 | */ | |
797 | levt->event_handler = lapic_cal_handler; | |
798 | lapic_timer_setup(CLOCK_EVT_MODE_PERIODIC, levt); | |
799 | lapic_cal_loops = -1; | |
800 | ||
801 | /* Let the interrupts run */ | |
802 | local_irq_enable(); | |
803 | ||
804 | while (lapic_cal_loops <= LAPIC_CAL_LOOPS) | |
805 | cpu_relax(); | |
806 | ||
2f04fa88 YL |
807 | /* Stop the lapic timer */ |
808 | lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, levt); | |
809 | ||
2f04fa88 YL |
810 | /* Jiffies delta */ |
811 | deltaj = lapic_cal_j2 - lapic_cal_j1; | |
812 | apic_printk(APIC_VERBOSE, "... jiffies delta = %lu\n", deltaj); | |
813 | ||
814 | /* Check, if the jiffies result is consistent */ | |
815 | if (deltaj >= LAPIC_CAL_LOOPS-2 && deltaj <= LAPIC_CAL_LOOPS+2) | |
816 | apic_printk(APIC_VERBOSE, "... jiffies result ok\n"); | |
817 | else | |
818 | levt->features |= CLOCK_EVT_FEAT_DUMMY; | |
819 | } else | |
820 | local_irq_enable(); | |
821 | ||
822 | if (levt->features & CLOCK_EVT_FEAT_DUMMY) { | |
e423e33e | 823 | pr_warning("APIC timer disabled due to verification failure\n"); |
2f04fa88 YL |
824 | return -1; |
825 | } | |
826 | ||
827 | return 0; | |
828 | } | |
829 | ||
e83a5fdc HS |
830 | /* |
831 | * Setup the boot APIC | |
832 | * | |
833 | * Calibrate and verify the result. | |
834 | */ | |
0e078e2f TG |
835 | void __init setup_boot_APIC_clock(void) |
836 | { | |
837 | /* | |
274cfe59 CG |
838 | * The local apic timer can be disabled via the kernel |
839 | * commandline or from the CPU detection code. Register the lapic | |
840 | * timer as a dummy clock event source on SMP systems, so the | |
841 | * broadcast mechanism is used. On UP systems simply ignore it. | |
0e078e2f TG |
842 | */ |
843 | if (disable_apic_timer) { | |
ba21ebb6 | 844 | pr_info("Disabling APIC timer\n"); |
0e078e2f | 845 | /* No broadcast on UP ! */ |
9d09951d TG |
846 | if (num_possible_cpus() > 1) { |
847 | lapic_clockevent.mult = 1; | |
0e078e2f | 848 | setup_APIC_timer(); |
9d09951d | 849 | } |
0e078e2f TG |
850 | return; |
851 | } | |
852 | ||
89b3b1f4 | 853 | if (calibrate_APIC_clock()) { |
c2b84b30 TG |
854 | /* No broadcast on UP ! */ |
855 | if (num_possible_cpus() > 1) | |
856 | setup_APIC_timer(); | |
857 | return; | |
858 | } | |
859 | ||
0e078e2f TG |
860 | /* |
861 | * If nmi_watchdog is set to IO_APIC, we need the | |
862 | * PIT/HPET going. Otherwise register lapic as a dummy | |
863 | * device. | |
864 | */ | |
072b198a | 865 | lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY; |
0e078e2f | 866 | |
274cfe59 | 867 | /* Setup the lapic or request the broadcast */ |
0e078e2f TG |
868 | setup_APIC_timer(); |
869 | } | |
870 | ||
0e078e2f TG |
871 | void __cpuinit setup_secondary_APIC_clock(void) |
872 | { | |
0e078e2f TG |
873 | setup_APIC_timer(); |
874 | } | |
875 | ||
876 | /* | |
877 | * The guts of the apic timer interrupt | |
878 | */ | |
879 | static void local_apic_timer_interrupt(void) | |
880 | { | |
881 | int cpu = smp_processor_id(); | |
882 | struct clock_event_device *evt = &per_cpu(lapic_events, cpu); | |
883 | ||
884 | /* | |
885 | * Normally we should not be here till LAPIC has been initialized but | |
886 | * in some cases like kdump, its possible that there is a pending LAPIC | |
887 | * timer interrupt from previous kernel's context and is delivered in | |
888 | * new kernel the moment interrupts are enabled. | |
889 | * | |
890 | * Interrupts are enabled early and LAPIC is setup much later, hence | |
891 | * its possible that when we get here evt->event_handler is NULL. | |
892 | * Check for event_handler being NULL and discard the interrupt as | |
893 | * spurious. | |
894 | */ | |
895 | if (!evt->event_handler) { | |
ba21ebb6 | 896 | pr_warning("Spurious LAPIC timer interrupt on cpu %d\n", cpu); |
0e078e2f TG |
897 | /* Switch it off */ |
898 | lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, evt); | |
899 | return; | |
900 | } | |
901 | ||
902 | /* | |
903 | * the NMI deadlock-detector uses this. | |
904 | */ | |
915b0d01 | 905 | inc_irq_stat(apic_timer_irqs); |
0e078e2f TG |
906 | |
907 | evt->event_handler(evt); | |
908 | } | |
909 | ||
910 | /* | |
911 | * Local APIC timer interrupt. This is the most natural way for doing | |
912 | * local interrupts, but local timer interrupts can be emulated by | |
913 | * broadcast interrupts too. [in case the hw doesn't support APIC timers] | |
914 | * | |
915 | * [ if a single-CPU system runs an SMP kernel then we call the local | |
916 | * interrupt as well. Thus we cannot inline the local irq ... ] | |
917 | */ | |
bcbc4f20 | 918 | void __irq_entry smp_apic_timer_interrupt(struct pt_regs *regs) |
0e078e2f TG |
919 | { |
920 | struct pt_regs *old_regs = set_irq_regs(regs); | |
921 | ||
922 | /* | |
923 | * NOTE! We'd better ACK the irq immediately, | |
924 | * because timer handling can be slow. | |
eddc0e92 | 925 | * |
0e078e2f TG |
926 | * update_process_times() expects us to have done irq_enter(). |
927 | * Besides, if we don't timer interrupts ignore the global | |
928 | * interrupt lock, which is the WrongThing (tm) to do. | |
929 | */ | |
eddc0e92 | 930 | entering_ack_irq(); |
0e078e2f | 931 | local_apic_timer_interrupt(); |
eddc0e92 | 932 | exiting_irq(); |
274cfe59 | 933 | |
0e078e2f TG |
934 | set_irq_regs(old_regs); |
935 | } | |
936 | ||
cf910e83 SA |
937 | void __irq_entry smp_trace_apic_timer_interrupt(struct pt_regs *regs) |
938 | { | |
939 | struct pt_regs *old_regs = set_irq_regs(regs); | |
940 | ||
941 | /* | |
942 | * NOTE! We'd better ACK the irq immediately, | |
943 | * because timer handling can be slow. | |
944 | * | |
945 | * update_process_times() expects us to have done irq_enter(). | |
946 | * Besides, if we don't timer interrupts ignore the global | |
947 | * interrupt lock, which is the WrongThing (tm) to do. | |
948 | */ | |
949 | entering_ack_irq(); | |
950 | trace_local_timer_entry(LOCAL_TIMER_VECTOR); | |
951 | local_apic_timer_interrupt(); | |
952 | trace_local_timer_exit(LOCAL_TIMER_VECTOR); | |
953 | exiting_irq(); | |
954 | ||
955 | set_irq_regs(old_regs); | |
956 | } | |
957 | ||
0e078e2f TG |
958 | int setup_profiling_timer(unsigned int multiplier) |
959 | { | |
960 | return -EINVAL; | |
961 | } | |
962 | ||
0e078e2f TG |
963 | /* |
964 | * Local APIC start and shutdown | |
965 | */ | |
966 | ||
967 | /** | |
968 | * clear_local_APIC - shutdown the local APIC | |
969 | * | |
970 | * This is called, when a CPU is disabled and before rebooting, so the state of | |
971 | * the local APIC has no dangling leftovers. Also used to cleanout any BIOS | |
972 | * leftovers during boot. | |
973 | */ | |
974 | void clear_local_APIC(void) | |
975 | { | |
2584a82d | 976 | int maxlvt; |
0e078e2f TG |
977 | u32 v; |
978 | ||
d3432896 | 979 | /* APIC hasn't been mapped yet */ |
fc1edaf9 | 980 | if (!x2apic_mode && !apic_phys) |
d3432896 AK |
981 | return; |
982 | ||
983 | maxlvt = lapic_get_maxlvt(); | |
0e078e2f TG |
984 | /* |
985 | * Masking an LVT entry can trigger a local APIC error | |
986 | * if the vector is zero. Mask LVTERR first to prevent this. | |
987 | */ | |
988 | if (maxlvt >= 3) { | |
989 | v = ERROR_APIC_VECTOR; /* any non-zero vector will do */ | |
990 | apic_write(APIC_LVTERR, v | APIC_LVT_MASKED); | |
991 | } | |
992 | /* | |
993 | * Careful: we have to set masks only first to deassert | |
994 | * any level-triggered sources. | |
995 | */ | |
996 | v = apic_read(APIC_LVTT); | |
997 | apic_write(APIC_LVTT, v | APIC_LVT_MASKED); | |
998 | v = apic_read(APIC_LVT0); | |
999 | apic_write(APIC_LVT0, v | APIC_LVT_MASKED); | |
1000 | v = apic_read(APIC_LVT1); | |
1001 | apic_write(APIC_LVT1, v | APIC_LVT_MASKED); | |
1002 | if (maxlvt >= 4) { | |
1003 | v = apic_read(APIC_LVTPC); | |
1004 | apic_write(APIC_LVTPC, v | APIC_LVT_MASKED); | |
1005 | } | |
1006 | ||
6764014b | 1007 | /* lets not touch this if we didn't frob it */ |
4efc0670 | 1008 | #ifdef CONFIG_X86_THERMAL_VECTOR |
6764014b CG |
1009 | if (maxlvt >= 5) { |
1010 | v = apic_read(APIC_LVTTHMR); | |
1011 | apic_write(APIC_LVTTHMR, v | APIC_LVT_MASKED); | |
1012 | } | |
1013 | #endif | |
5ca8681c AK |
1014 | #ifdef CONFIG_X86_MCE_INTEL |
1015 | if (maxlvt >= 6) { | |
1016 | v = apic_read(APIC_LVTCMCI); | |
1017 | if (!(v & APIC_LVT_MASKED)) | |
1018 | apic_write(APIC_LVTCMCI, v | APIC_LVT_MASKED); | |
1019 | } | |
1020 | #endif | |
1021 | ||
0e078e2f TG |
1022 | /* |
1023 | * Clean APIC state for other OSs: | |
1024 | */ | |
1025 | apic_write(APIC_LVTT, APIC_LVT_MASKED); | |
1026 | apic_write(APIC_LVT0, APIC_LVT_MASKED); | |
1027 | apic_write(APIC_LVT1, APIC_LVT_MASKED); | |
1028 | if (maxlvt >= 3) | |
1029 | apic_write(APIC_LVTERR, APIC_LVT_MASKED); | |
1030 | if (maxlvt >= 4) | |
1031 | apic_write(APIC_LVTPC, APIC_LVT_MASKED); | |
6764014b CG |
1032 | |
1033 | /* Integrated APIC (!82489DX) ? */ | |
1034 | if (lapic_is_integrated()) { | |
1035 | if (maxlvt > 3) | |
1036 | /* Clear ESR due to Pentium errata 3AP and 11AP */ | |
1037 | apic_write(APIC_ESR, 0); | |
1038 | apic_read(APIC_ESR); | |
1039 | } | |
0e078e2f TG |
1040 | } |
1041 | ||
1042 | /** | |
1043 | * disable_local_APIC - clear and disable the local APIC | |
1044 | */ | |
1045 | void disable_local_APIC(void) | |
1046 | { | |
1047 | unsigned int value; | |
1048 | ||
4a13ad0b | 1049 | /* APIC hasn't been mapped yet */ |
fd19dce7 | 1050 | if (!x2apic_mode && !apic_phys) |
4a13ad0b JB |
1051 | return; |
1052 | ||
0e078e2f TG |
1053 | clear_local_APIC(); |
1054 | ||
1055 | /* | |
1056 | * Disable APIC (implies clearing of registers | |
1057 | * for 82489DX!). | |
1058 | */ | |
1059 | value = apic_read(APIC_SPIV); | |
1060 | value &= ~APIC_SPIV_APIC_ENABLED; | |
1061 | apic_write(APIC_SPIV, value); | |
990b183e CG |
1062 | |
1063 | #ifdef CONFIG_X86_32 | |
1064 | /* | |
1065 | * When LAPIC was disabled by the BIOS and enabled by the kernel, | |
1066 | * restore the disabled state. | |
1067 | */ | |
1068 | if (enabled_via_apicbase) { | |
1069 | unsigned int l, h; | |
1070 | ||
1071 | rdmsr(MSR_IA32_APICBASE, l, h); | |
1072 | l &= ~MSR_IA32_APICBASE_ENABLE; | |
1073 | wrmsr(MSR_IA32_APICBASE, l, h); | |
1074 | } | |
1075 | #endif | |
0e078e2f TG |
1076 | } |
1077 | ||
fe4024dc CG |
1078 | /* |
1079 | * If Linux enabled the LAPIC against the BIOS default disable it down before | |
1080 | * re-entering the BIOS on shutdown. Otherwise the BIOS may get confused and | |
1081 | * not power-off. Additionally clear all LVT entries before disable_local_APIC | |
1082 | * for the case where Linux didn't enable the LAPIC. | |
1083 | */ | |
0e078e2f TG |
1084 | void lapic_shutdown(void) |
1085 | { | |
1086 | unsigned long flags; | |
1087 | ||
8312136f | 1088 | if (!cpu_has_apic && !apic_from_smp_config()) |
0e078e2f TG |
1089 | return; |
1090 | ||
1091 | local_irq_save(flags); | |
1092 | ||
fe4024dc CG |
1093 | #ifdef CONFIG_X86_32 |
1094 | if (!enabled_via_apicbase) | |
1095 | clear_local_APIC(); | |
1096 | else | |
1097 | #endif | |
1098 | disable_local_APIC(); | |
1099 | ||
0e078e2f TG |
1100 | |
1101 | local_irq_restore(flags); | |
1102 | } | |
1103 | ||
1104 | /* | |
1105 | * This is to verify that we're looking at a real local APIC. | |
1106 | * Check these against your board if the CPUs aren't getting | |
1107 | * started for no apparent reason. | |
1108 | */ | |
1109 | int __init verify_local_APIC(void) | |
1110 | { | |
1111 | unsigned int reg0, reg1; | |
1112 | ||
1113 | /* | |
1114 | * The version register is read-only in a real APIC. | |
1115 | */ | |
1116 | reg0 = apic_read(APIC_LVR); | |
1117 | apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg0); | |
1118 | apic_write(APIC_LVR, reg0 ^ APIC_LVR_MASK); | |
1119 | reg1 = apic_read(APIC_LVR); | |
1120 | apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg1); | |
1121 | ||
1122 | /* | |
1123 | * The two version reads above should print the same | |
1124 | * numbers. If the second one is different, then we | |
1125 | * poke at a non-APIC. | |
1126 | */ | |
1127 | if (reg1 != reg0) | |
1128 | return 0; | |
1129 | ||
1130 | /* | |
1131 | * Check if the version looks reasonably. | |
1132 | */ | |
1133 | reg1 = GET_APIC_VERSION(reg0); | |
1134 | if (reg1 == 0x00 || reg1 == 0xff) | |
1135 | return 0; | |
1136 | reg1 = lapic_get_maxlvt(); | |
1137 | if (reg1 < 0x02 || reg1 == 0xff) | |
1138 | return 0; | |
1139 | ||
1140 | /* | |
1141 | * The ID register is read/write in a real APIC. | |
1142 | */ | |
2d7a66d0 | 1143 | reg0 = apic_read(APIC_ID); |
0e078e2f | 1144 | apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg0); |
5b812727 | 1145 | apic_write(APIC_ID, reg0 ^ apic->apic_id_mask); |
2d7a66d0 | 1146 | reg1 = apic_read(APIC_ID); |
0e078e2f TG |
1147 | apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg1); |
1148 | apic_write(APIC_ID, reg0); | |
5b812727 | 1149 | if (reg1 != (reg0 ^ apic->apic_id_mask)) |
0e078e2f TG |
1150 | return 0; |
1151 | ||
1152 | /* | |
1da177e4 LT |
1153 | * The next two are just to see if we have sane values. |
1154 | * They're only really relevant if we're in Virtual Wire | |
1155 | * compatibility mode, but most boxes are anymore. | |
1156 | */ | |
1157 | reg0 = apic_read(APIC_LVT0); | |
0e078e2f | 1158 | apic_printk(APIC_DEBUG, "Getting LVT0: %x\n", reg0); |
1da177e4 LT |
1159 | reg1 = apic_read(APIC_LVT1); |
1160 | apic_printk(APIC_DEBUG, "Getting LVT1: %x\n", reg1); | |
1161 | ||
1162 | return 1; | |
1163 | } | |
1164 | ||
0e078e2f TG |
1165 | /** |
1166 | * sync_Arb_IDs - synchronize APIC bus arbitration IDs | |
1167 | */ | |
1da177e4 LT |
1168 | void __init sync_Arb_IDs(void) |
1169 | { | |
296cb951 CG |
1170 | /* |
1171 | * Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 And not | |
1172 | * needed on AMD. | |
1173 | */ | |
1174 | if (modern_apic() || boot_cpu_data.x86_vendor == X86_VENDOR_AMD) | |
1da177e4 LT |
1175 | return; |
1176 | ||
1177 | /* | |
1178 | * Wait for idle. | |
1179 | */ | |
1180 | apic_wait_icr_idle(); | |
1181 | ||
1182 | apic_printk(APIC_DEBUG, "Synchronizing Arb IDs.\n"); | |
6f6da97f CG |
1183 | apic_write(APIC_ICR, APIC_DEST_ALLINC | |
1184 | APIC_INT_LEVELTRIG | APIC_DM_INIT); | |
1da177e4 LT |
1185 | } |
1186 | ||
1da177e4 LT |
1187 | /* |
1188 | * An initial setup of the virtual wire mode. | |
1189 | */ | |
1190 | void __init init_bsp_APIC(void) | |
1191 | { | |
11a8e778 | 1192 | unsigned int value; |
1da177e4 LT |
1193 | |
1194 | /* | |
1195 | * Don't do the setup now if we have a SMP BIOS as the | |
1196 | * through-I/O-APIC virtual wire mode might be active. | |
1197 | */ | |
1198 | if (smp_found_config || !cpu_has_apic) | |
1199 | return; | |
1200 | ||
1da177e4 LT |
1201 | /* |
1202 | * Do not trust the local APIC being empty at bootup. | |
1203 | */ | |
1204 | clear_local_APIC(); | |
1205 | ||
1206 | /* | |
1207 | * Enable APIC. | |
1208 | */ | |
1209 | value = apic_read(APIC_SPIV); | |
1210 | value &= ~APIC_VECTOR_MASK; | |
1211 | value |= APIC_SPIV_APIC_ENABLED; | |
638c0411 CG |
1212 | |
1213 | #ifdef CONFIG_X86_32 | |
1214 | /* This bit is reserved on P4/Xeon and should be cleared */ | |
1215 | if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) && | |
1216 | (boot_cpu_data.x86 == 15)) | |
1217 | value &= ~APIC_SPIV_FOCUS_DISABLED; | |
1218 | else | |
1219 | #endif | |
1220 | value |= APIC_SPIV_FOCUS_DISABLED; | |
1da177e4 | 1221 | value |= SPURIOUS_APIC_VECTOR; |
11a8e778 | 1222 | apic_write(APIC_SPIV, value); |
1da177e4 LT |
1223 | |
1224 | /* | |
1225 | * Set up the virtual wire mode. | |
1226 | */ | |
11a8e778 | 1227 | apic_write(APIC_LVT0, APIC_DM_EXTINT); |
1da177e4 | 1228 | value = APIC_DM_NMI; |
638c0411 CG |
1229 | if (!lapic_is_integrated()) /* 82489DX */ |
1230 | value |= APIC_LVT_LEVEL_TRIGGER; | |
11a8e778 | 1231 | apic_write(APIC_LVT1, value); |
1da177e4 LT |
1232 | } |
1233 | ||
c43da2f5 CG |
1234 | static void __cpuinit lapic_setup_esr(void) |
1235 | { | |
9df08f10 CG |
1236 | unsigned int oldvalue, value, maxlvt; |
1237 | ||
1238 | if (!lapic_is_integrated()) { | |
ba21ebb6 | 1239 | pr_info("No ESR for 82489DX.\n"); |
9df08f10 CG |
1240 | return; |
1241 | } | |
c43da2f5 | 1242 | |
08125d3e | 1243 | if (apic->disable_esr) { |
c43da2f5 | 1244 | /* |
9df08f10 CG |
1245 | * Something untraceable is creating bad interrupts on |
1246 | * secondary quads ... for the moment, just leave the | |
1247 | * ESR disabled - we can't do anything useful with the | |
1248 | * errors anyway - mbligh | |
c43da2f5 | 1249 | */ |
ba21ebb6 | 1250 | pr_info("Leaving ESR disabled.\n"); |
9df08f10 | 1251 | return; |
c43da2f5 | 1252 | } |
9df08f10 CG |
1253 | |
1254 | maxlvt = lapic_get_maxlvt(); | |
1255 | if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */ | |
1256 | apic_write(APIC_ESR, 0); | |
1257 | oldvalue = apic_read(APIC_ESR); | |
1258 | ||
1259 | /* enables sending errors */ | |
1260 | value = ERROR_APIC_VECTOR; | |
1261 | apic_write(APIC_LVTERR, value); | |
1262 | ||
1263 | /* | |
1264 | * spec says clear errors after enabling vector. | |
1265 | */ | |
1266 | if (maxlvt > 3) | |
1267 | apic_write(APIC_ESR, 0); | |
1268 | value = apic_read(APIC_ESR); | |
1269 | if (value != oldvalue) | |
1270 | apic_printk(APIC_VERBOSE, "ESR value before enabling " | |
1271 | "vector: 0x%08x after: 0x%08x\n", | |
1272 | oldvalue, value); | |
c43da2f5 CG |
1273 | } |
1274 | ||
0e078e2f TG |
1275 | /** |
1276 | * setup_local_APIC - setup the local APIC | |
0aa002fe TH |
1277 | * |
1278 | * Used to setup local APIC while initializing BSP or bringin up APs. | |
1279 | * Always called with preemption disabled. | |
0e078e2f TG |
1280 | */ |
1281 | void __cpuinit setup_local_APIC(void) | |
1da177e4 | 1282 | { |
0aa002fe | 1283 | int cpu = smp_processor_id(); |
8c3ba8d0 KJ |
1284 | unsigned int value, queued; |
1285 | int i, j, acked = 0; | |
1286 | unsigned long long tsc = 0, ntsc; | |
1287 | long long max_loops = cpu_khz; | |
1288 | ||
1289 | if (cpu_has_tsc) | |
1290 | rdtscll(tsc); | |
1da177e4 | 1291 | |
f1182638 | 1292 | if (disable_apic) { |
7167d08e | 1293 | disable_ioapic_support(); |
f1182638 JB |
1294 | return; |
1295 | } | |
1296 | ||
89c38c28 CG |
1297 | #ifdef CONFIG_X86_32 |
1298 | /* Pound the ESR really hard over the head with a big hammer - mbligh */ | |
08125d3e | 1299 | if (lapic_is_integrated() && apic->disable_esr) { |
89c38c28 CG |
1300 | apic_write(APIC_ESR, 0); |
1301 | apic_write(APIC_ESR, 0); | |
1302 | apic_write(APIC_ESR, 0); | |
1303 | apic_write(APIC_ESR, 0); | |
1304 | } | |
1305 | #endif | |
cdd6c482 | 1306 | perf_events_lapic_init(); |
89c38c28 | 1307 | |
1da177e4 LT |
1308 | /* |
1309 | * Double-check whether this APIC is really registered. | |
1310 | * This is meaningless in clustered apic mode, so we skip it. | |
1311 | */ | |
c2777f98 | 1312 | BUG_ON(!apic->apic_id_registered()); |
1da177e4 LT |
1313 | |
1314 | /* | |
1315 | * Intel recommends to set DFR, LDR and TPR before enabling | |
1316 | * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel | |
1317 | * document number 292116). So here it goes... | |
1318 | */ | |
a5c43296 | 1319 | apic->init_apic_ldr(); |
1da177e4 | 1320 | |
6f802c4b TH |
1321 | #ifdef CONFIG_X86_32 |
1322 | /* | |
acb8bc09 TH |
1323 | * APIC LDR is initialized. If logical_apicid mapping was |
1324 | * initialized during get_smp_config(), make sure it matches the | |
1325 | * actual value. | |
6f802c4b | 1326 | */ |
acb8bc09 TH |
1327 | i = early_per_cpu(x86_cpu_to_logical_apicid, cpu); |
1328 | WARN_ON(i != BAD_APICID && i != logical_smp_processor_id()); | |
1329 | /* always use the value from LDR */ | |
6f802c4b TH |
1330 | early_per_cpu(x86_cpu_to_logical_apicid, cpu) = |
1331 | logical_smp_processor_id(); | |
c4b90c11 TH |
1332 | |
1333 | /* | |
1334 | * Some NUMA implementations (NUMAQ) don't initialize apicid to | |
1335 | * node mapping during NUMA init. Now that logical apicid is | |
1336 | * guaranteed to be known, give it another chance. This is already | |
1337 | * a bit too late - percpu allocation has already happened without | |
1338 | * proper NUMA affinity. | |
1339 | */ | |
84914ed0 TH |
1340 | if (apic->x86_32_numa_cpu_node) |
1341 | set_apicid_to_node(early_per_cpu(x86_cpu_to_apicid, cpu), | |
1342 | apic->x86_32_numa_cpu_node(cpu)); | |
6f802c4b TH |
1343 | #endif |
1344 | ||
1da177e4 LT |
1345 | /* |
1346 | * Set Task Priority to 'accept all'. We never change this | |
1347 | * later on. | |
1348 | */ | |
1349 | value = apic_read(APIC_TASKPRI); | |
1350 | value &= ~APIC_TPRI_MASK; | |
11a8e778 | 1351 | apic_write(APIC_TASKPRI, value); |
1da177e4 | 1352 | |
da7ed9f9 VG |
1353 | /* |
1354 | * After a crash, we no longer service the interrupts and a pending | |
1355 | * interrupt from previous kernel might still have ISR bit set. | |
1356 | * | |
1357 | * Most probably by now CPU has serviced that pending interrupt and | |
1358 | * it might not have done the ack_APIC_irq() because it thought, | |
1359 | * interrupt came from i8259 as ExtInt. LAPIC did not get EOI so it | |
1360 | * does not clear the ISR bit and cpu thinks it has already serivced | |
1361 | * the interrupt. Hence a vector might get locked. It was noticed | |
1362 | * for timer irq (vector 0x31). Issue an extra EOI to clear ISR. | |
1363 | */ | |
8c3ba8d0 KJ |
1364 | do { |
1365 | queued = 0; | |
1366 | for (i = APIC_ISR_NR - 1; i >= 0; i--) | |
1367 | queued |= apic_read(APIC_IRR + i*0x10); | |
1368 | ||
1369 | for (i = APIC_ISR_NR - 1; i >= 0; i--) { | |
1370 | value = apic_read(APIC_ISR + i*0x10); | |
1371 | for (j = 31; j >= 0; j--) { | |
1372 | if (value & (1<<j)) { | |
1373 | ack_APIC_irq(); | |
1374 | acked++; | |
1375 | } | |
1376 | } | |
da7ed9f9 | 1377 | } |
8c3ba8d0 KJ |
1378 | if (acked > 256) { |
1379 | printk(KERN_ERR "LAPIC pending interrupts after %d EOI\n", | |
1380 | acked); | |
1381 | break; | |
1382 | } | |
42fa4250 SF |
1383 | if (queued) { |
1384 | if (cpu_has_tsc) { | |
1385 | rdtscll(ntsc); | |
1386 | max_loops = (cpu_khz << 10) - (ntsc - tsc); | |
1387 | } else | |
1388 | max_loops--; | |
1389 | } | |
8c3ba8d0 KJ |
1390 | } while (queued && max_loops > 0); |
1391 | WARN_ON(max_loops <= 0); | |
da7ed9f9 | 1392 | |
1da177e4 LT |
1393 | /* |
1394 | * Now that we are all set up, enable the APIC | |
1395 | */ | |
1396 | value = apic_read(APIC_SPIV); | |
1397 | value &= ~APIC_VECTOR_MASK; | |
1398 | /* | |
1399 | * Enable APIC | |
1400 | */ | |
1401 | value |= APIC_SPIV_APIC_ENABLED; | |
1402 | ||
89c38c28 CG |
1403 | #ifdef CONFIG_X86_32 |
1404 | /* | |
1405 | * Some unknown Intel IO/APIC (or APIC) errata is biting us with | |
1406 | * certain networking cards. If high frequency interrupts are | |
1407 | * happening on a particular IOAPIC pin, plus the IOAPIC routing | |
1408 | * entry is masked/unmasked at a high rate as well then sooner or | |
1409 | * later IOAPIC line gets 'stuck', no more interrupts are received | |
1410 | * from the device. If focus CPU is disabled then the hang goes | |
1411 | * away, oh well :-( | |
1412 | * | |
1413 | * [ This bug can be reproduced easily with a level-triggered | |
1414 | * PCI Ne2000 networking cards and PII/PIII processors, dual | |
1415 | * BX chipset. ] | |
1416 | */ | |
1417 | /* | |
1418 | * Actually disabling the focus CPU check just makes the hang less | |
1419 | * frequent as it makes the interrupt distributon model be more | |
1420 | * like LRU than MRU (the short-term load is more even across CPUs). | |
1421 | * See also the comment in end_level_ioapic_irq(). --macro | |
1422 | */ | |
1423 | ||
1424 | /* | |
1425 | * - enable focus processor (bit==0) | |
1426 | * - 64bit mode always use processor focus | |
1427 | * so no need to set it | |
1428 | */ | |
1429 | value &= ~APIC_SPIV_FOCUS_DISABLED; | |
1430 | #endif | |
3f14c746 | 1431 | |
1da177e4 LT |
1432 | /* |
1433 | * Set spurious IRQ vector | |
1434 | */ | |
1435 | value |= SPURIOUS_APIC_VECTOR; | |
11a8e778 | 1436 | apic_write(APIC_SPIV, value); |
1da177e4 LT |
1437 | |
1438 | /* | |
1439 | * Set up LVT0, LVT1: | |
1440 | * | |
1441 | * set up through-local-APIC on the BP's LINT0. This is not | |
1442 | * strictly necessary in pure symmetric-IO mode, but sometimes | |
1443 | * we delegate interrupts to the 8259A. | |
1444 | */ | |
1445 | /* | |
1446 | * TODO: set up through-local-APIC from through-I/O-APIC? --macro | |
1447 | */ | |
1448 | value = apic_read(APIC_LVT0) & APIC_LVT_MASKED; | |
0aa002fe | 1449 | if (!cpu && (pic_mode || !value)) { |
1da177e4 | 1450 | value = APIC_DM_EXTINT; |
0aa002fe | 1451 | apic_printk(APIC_VERBOSE, "enabled ExtINT on CPU#%d\n", cpu); |
1da177e4 LT |
1452 | } else { |
1453 | value = APIC_DM_EXTINT | APIC_LVT_MASKED; | |
0aa002fe | 1454 | apic_printk(APIC_VERBOSE, "masked ExtINT on CPU#%d\n", cpu); |
1da177e4 | 1455 | } |
11a8e778 | 1456 | apic_write(APIC_LVT0, value); |
1da177e4 LT |
1457 | |
1458 | /* | |
1459 | * only the BP should see the LINT1 NMI signal, obviously. | |
1460 | */ | |
0aa002fe | 1461 | if (!cpu) |
1da177e4 LT |
1462 | value = APIC_DM_NMI; |
1463 | else | |
1464 | value = APIC_DM_NMI | APIC_LVT_MASKED; | |
89c38c28 CG |
1465 | if (!lapic_is_integrated()) /* 82489DX */ |
1466 | value |= APIC_LVT_LEVEL_TRIGGER; | |
11a8e778 | 1467 | apic_write(APIC_LVT1, value); |
89c38c28 | 1468 | |
be71b855 AK |
1469 | #ifdef CONFIG_X86_MCE_INTEL |
1470 | /* Recheck CMCI information after local APIC is up on CPU #0 */ | |
0aa002fe | 1471 | if (!cpu) |
be71b855 AK |
1472 | cmci_recheck(); |
1473 | #endif | |
739f33b3 | 1474 | } |
1da177e4 | 1475 | |
739f33b3 AK |
1476 | void __cpuinit end_local_APIC_setup(void) |
1477 | { | |
1478 | lapic_setup_esr(); | |
fa6b95fc CG |
1479 | |
1480 | #ifdef CONFIG_X86_32 | |
1b4ee4e4 CG |
1481 | { |
1482 | unsigned int value; | |
1483 | /* Disable the local apic timer */ | |
1484 | value = apic_read(APIC_LVTT); | |
1485 | value |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR); | |
1486 | apic_write(APIC_LVTT, value); | |
1487 | } | |
fa6b95fc CG |
1488 | #endif |
1489 | ||
0e078e2f | 1490 | apic_pm_activate(); |
2fb270f3 JB |
1491 | } |
1492 | ||
1493 | void __init bsp_end_local_APIC_setup(void) | |
1494 | { | |
1495 | end_local_APIC_setup(); | |
7f7fbf45 KK |
1496 | |
1497 | /* | |
1498 | * Now that local APIC setup is completed for BP, configure the fault | |
1499 | * handling for interrupt remapping. | |
1500 | */ | |
70733e0c | 1501 | irq_remap_enable_fault_handling(); |
7f7fbf45 | 1502 | |
1da177e4 | 1503 | } |
1da177e4 | 1504 | |
06cd9a7d | 1505 | #ifdef CONFIG_X86_X2APIC |
fb209bd8 YL |
1506 | /* |
1507 | * Need to disable xapic and x2apic at the same time and then enable xapic mode | |
1508 | */ | |
1509 | static inline void __disable_x2apic(u64 msr) | |
1510 | { | |
1511 | wrmsrl(MSR_IA32_APICBASE, | |
1512 | msr & ~(X2APIC_ENABLE | XAPIC_ENABLE)); | |
1513 | wrmsrl(MSR_IA32_APICBASE, msr & ~X2APIC_ENABLE); | |
1514 | } | |
1515 | ||
a31bc327 | 1516 | static __init void disable_x2apic(void) |
fb209bd8 YL |
1517 | { |
1518 | u64 msr; | |
1519 | ||
1520 | if (!cpu_has_x2apic) | |
1521 | return; | |
1522 | ||
1523 | rdmsrl(MSR_IA32_APICBASE, msr); | |
1524 | if (msr & X2APIC_ENABLE) { | |
1525 | u32 x2apic_id = read_apic_id(); | |
1526 | ||
1527 | if (x2apic_id >= 255) | |
1528 | panic("Cannot disable x2apic, id: %08x\n", x2apic_id); | |
1529 | ||
1530 | pr_info("Disabling x2apic\n"); | |
1531 | __disable_x2apic(msr); | |
1532 | ||
a31bc327 YL |
1533 | if (nox2apic) { |
1534 | clear_cpu_cap(&cpu_data(0), X86_FEATURE_X2APIC); | |
1535 | setup_clear_cpu_cap(X86_FEATURE_X2APIC); | |
1536 | } | |
1537 | ||
fb209bd8 YL |
1538 | x2apic_disabled = 1; |
1539 | x2apic_mode = 0; | |
1540 | ||
1541 | register_lapic_address(mp_lapic_addr); | |
1542 | } | |
1543 | } | |
1544 | ||
6e1cb38a SS |
1545 | void check_x2apic(void) |
1546 | { | |
ef1f87aa | 1547 | if (x2apic_enabled()) { |
ba21ebb6 | 1548 | pr_info("x2apic enabled by BIOS, switching to x2apic ops\n"); |
fc1edaf9 | 1549 | x2apic_preenabled = x2apic_mode = 1; |
6e1cb38a SS |
1550 | } |
1551 | } | |
1552 | ||
1553 | void enable_x2apic(void) | |
1554 | { | |
fb209bd8 YL |
1555 | u64 msr; |
1556 | ||
1557 | rdmsrl(MSR_IA32_APICBASE, msr); | |
1558 | if (x2apic_disabled) { | |
1559 | __disable_x2apic(msr); | |
1560 | return; | |
1561 | } | |
6e1cb38a | 1562 | |
fc1edaf9 | 1563 | if (!x2apic_mode) |
06cd9a7d YL |
1564 | return; |
1565 | ||
6e1cb38a | 1566 | if (!(msr & X2APIC_ENABLE)) { |
450b1e8d | 1567 | printk_once(KERN_INFO "Enabling x2apic\n"); |
fb209bd8 | 1568 | wrmsrl(MSR_IA32_APICBASE, msr | X2APIC_ENABLE); |
6e1cb38a SS |
1569 | } |
1570 | } | |
93758238 | 1571 | #endif /* CONFIG_X86_X2APIC */ |
6e1cb38a | 1572 | |
ce69a784 | 1573 | int __init enable_IR(void) |
6e1cb38a | 1574 | { |
d3f13810 | 1575 | #ifdef CONFIG_IRQ_REMAP |
95a02e97 | 1576 | if (!irq_remapping_supported()) { |
93758238 | 1577 | pr_debug("intr-remapping not supported\n"); |
41750d31 | 1578 | return -1; |
6e1cb38a SS |
1579 | } |
1580 | ||
93758238 WH |
1581 | if (!x2apic_preenabled && skip_ioapic_setup) { |
1582 | pr_info("Skipped enabling intr-remap because of skipping " | |
1583 | "io-apic setup\n"); | |
41750d31 | 1584 | return -1; |
6e1cb38a SS |
1585 | } |
1586 | ||
95a02e97 | 1587 | return irq_remapping_enable(); |
ce69a784 | 1588 | #endif |
41750d31 | 1589 | return -1; |
ce69a784 GN |
1590 | } |
1591 | ||
1592 | void __init enable_IR_x2apic(void) | |
1593 | { | |
1594 | unsigned long flags; | |
ce69a784 | 1595 | int ret, x2apic_enabled = 0; |
736baef4 | 1596 | int hardware_init_ret; |
b7f42ab2 | 1597 | |
736baef4 | 1598 | /* Make sure irq_remap_ops are initialized */ |
95a02e97 | 1599 | setup_irq_remapping_ops(); |
736baef4 | 1600 | |
95a02e97 | 1601 | hardware_init_ret = irq_remapping_prepare(); |
736baef4 | 1602 | if (hardware_init_ret && !x2apic_supported()) |
e670761f | 1603 | return; |
ce69a784 | 1604 | |
31dce14a | 1605 | ret = save_ioapic_entries(); |
5ffa4eb2 | 1606 | if (ret) { |
ba21ebb6 | 1607 | pr_info("Saving IO-APIC state failed: %d\n", ret); |
fb209bd8 | 1608 | return; |
5ffa4eb2 | 1609 | } |
6e1cb38a | 1610 | |
05c3dc2c | 1611 | local_irq_save(flags); |
b81bb373 | 1612 | legacy_pic->mask_all(); |
31dce14a | 1613 | mask_ioapic_entries(); |
05c3dc2c | 1614 | |
a31bc327 YL |
1615 | if (x2apic_preenabled && nox2apic) |
1616 | disable_x2apic(); | |
1617 | ||
736baef4 | 1618 | if (hardware_init_ret) |
41750d31 | 1619 | ret = -1; |
b7f42ab2 YL |
1620 | else |
1621 | ret = enable_IR(); | |
1622 | ||
fb209bd8 | 1623 | if (!x2apic_supported()) |
a31bc327 | 1624 | goto skip_x2apic; |
fb209bd8 | 1625 | |
41750d31 | 1626 | if (ret < 0) { |
ce69a784 GN |
1627 | /* IR is required if there is APIC ID > 255 even when running |
1628 | * under KVM | |
1629 | */ | |
2904ed8d | 1630 | if (max_physical_apicid > 255 || |
fb209bd8 YL |
1631 | !hypervisor_x2apic_available()) { |
1632 | if (x2apic_preenabled) | |
1633 | disable_x2apic(); | |
a31bc327 | 1634 | goto skip_x2apic; |
fb209bd8 | 1635 | } |
ce69a784 GN |
1636 | /* |
1637 | * without IR all CPUs can be addressed by IOAPIC/MSI | |
1638 | * only in physical mode | |
1639 | */ | |
1640 | x2apic_force_phys(); | |
1641 | } | |
6e1cb38a | 1642 | |
fb209bd8 YL |
1643 | if (ret == IRQ_REMAP_XAPIC_MODE) { |
1644 | pr_info("x2apic not enabled, IRQ remapping is in xapic mode\n"); | |
a31bc327 | 1645 | goto skip_x2apic; |
fb209bd8 | 1646 | } |
41750d31 | 1647 | |
ce69a784 | 1648 | x2apic_enabled = 1; |
93758238 | 1649 | |
fc1edaf9 SS |
1650 | if (x2apic_supported() && !x2apic_mode) { |
1651 | x2apic_mode = 1; | |
6e1cb38a | 1652 | enable_x2apic(); |
93758238 | 1653 | pr_info("Enabled x2apic\n"); |
6e1cb38a | 1654 | } |
5ffa4eb2 | 1655 | |
a31bc327 | 1656 | skip_x2apic: |
41750d31 | 1657 | if (ret < 0) /* IR enabling failed */ |
31dce14a | 1658 | restore_ioapic_entries(); |
b81bb373 | 1659 | legacy_pic->restore_mask(); |
6e1cb38a | 1660 | local_irq_restore(flags); |
6e1cb38a | 1661 | } |
93758238 | 1662 | |
be7a656f | 1663 | #ifdef CONFIG_X86_64 |
1da177e4 LT |
1664 | /* |
1665 | * Detect and enable local APICs on non-SMP boards. | |
1666 | * Original code written by Keir Fraser. | |
1667 | * On AMD64 we trust the BIOS - if it says no APIC it is likely | |
6935d1f9 | 1668 | * not correctly set up (usually the APIC timer won't work etc.) |
1da177e4 | 1669 | */ |
0e078e2f | 1670 | static int __init detect_init_APIC(void) |
1da177e4 LT |
1671 | { |
1672 | if (!cpu_has_apic) { | |
ba21ebb6 | 1673 | pr_info("No local APIC present\n"); |
1da177e4 LT |
1674 | return -1; |
1675 | } | |
1676 | ||
1677 | mp_lapic_addr = APIC_DEFAULT_PHYS_BASE; | |
1da177e4 LT |
1678 | return 0; |
1679 | } | |
be7a656f | 1680 | #else |
5a7ae78f | 1681 | |
25874a29 | 1682 | static int __init apic_verify(void) |
5a7ae78f TG |
1683 | { |
1684 | u32 features, h, l; | |
1685 | ||
1686 | /* | |
1687 | * The APIC feature bit should now be enabled | |
1688 | * in `cpuid' | |
1689 | */ | |
1690 | features = cpuid_edx(1); | |
1691 | if (!(features & (1 << X86_FEATURE_APIC))) { | |
1692 | pr_warning("Could not enable APIC!\n"); | |
1693 | return -1; | |
1694 | } | |
1695 | set_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC); | |
1696 | mp_lapic_addr = APIC_DEFAULT_PHYS_BASE; | |
1697 | ||
1698 | /* The BIOS may have set up the APIC at some other address */ | |
cbf2829b BD |
1699 | if (boot_cpu_data.x86 >= 6) { |
1700 | rdmsr(MSR_IA32_APICBASE, l, h); | |
1701 | if (l & MSR_IA32_APICBASE_ENABLE) | |
1702 | mp_lapic_addr = l & MSR_IA32_APICBASE_BASE; | |
1703 | } | |
5a7ae78f TG |
1704 | |
1705 | pr_info("Found and enabled local APIC!\n"); | |
1706 | return 0; | |
1707 | } | |
1708 | ||
25874a29 | 1709 | int __init apic_force_enable(unsigned long addr) |
5a7ae78f TG |
1710 | { |
1711 | u32 h, l; | |
1712 | ||
1713 | if (disable_apic) | |
1714 | return -1; | |
1715 | ||
1716 | /* | |
1717 | * Some BIOSes disable the local APIC in the APIC_BASE | |
1718 | * MSR. This can only be done in software for Intel P6 or later | |
1719 | * and AMD K7 (Model > 1) or later. | |
1720 | */ | |
cbf2829b BD |
1721 | if (boot_cpu_data.x86 >= 6) { |
1722 | rdmsr(MSR_IA32_APICBASE, l, h); | |
1723 | if (!(l & MSR_IA32_APICBASE_ENABLE)) { | |
1724 | pr_info("Local APIC disabled by BIOS -- reenabling.\n"); | |
1725 | l &= ~MSR_IA32_APICBASE_BASE; | |
1726 | l |= MSR_IA32_APICBASE_ENABLE | addr; | |
1727 | wrmsr(MSR_IA32_APICBASE, l, h); | |
1728 | enabled_via_apicbase = 1; | |
1729 | } | |
5a7ae78f TG |
1730 | } |
1731 | return apic_verify(); | |
1732 | } | |
1733 | ||
be7a656f YL |
1734 | /* |
1735 | * Detect and initialize APIC | |
1736 | */ | |
1737 | static int __init detect_init_APIC(void) | |
1738 | { | |
be7a656f YL |
1739 | /* Disabled by kernel option? */ |
1740 | if (disable_apic) | |
1741 | return -1; | |
1742 | ||
1743 | switch (boot_cpu_data.x86_vendor) { | |
1744 | case X86_VENDOR_AMD: | |
1745 | if ((boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model > 1) || | |
85877061 | 1746 | (boot_cpu_data.x86 >= 15)) |
be7a656f YL |
1747 | break; |
1748 | goto no_apic; | |
1749 | case X86_VENDOR_INTEL: | |
1750 | if (boot_cpu_data.x86 == 6 || boot_cpu_data.x86 == 15 || | |
1751 | (boot_cpu_data.x86 == 5 && cpu_has_apic)) | |
1752 | break; | |
1753 | goto no_apic; | |
1754 | default: | |
1755 | goto no_apic; | |
1756 | } | |
1757 | ||
1758 | if (!cpu_has_apic) { | |
1759 | /* | |
1760 | * Over-ride BIOS and try to enable the local APIC only if | |
1761 | * "lapic" specified. | |
1762 | */ | |
1763 | if (!force_enable_local_apic) { | |
ba21ebb6 CG |
1764 | pr_info("Local APIC disabled by BIOS -- " |
1765 | "you can enable it with \"lapic\"\n"); | |
be7a656f YL |
1766 | return -1; |
1767 | } | |
a906fdaa | 1768 | if (apic_force_enable(APIC_DEFAULT_PHYS_BASE)) |
5a7ae78f TG |
1769 | return -1; |
1770 | } else { | |
1771 | if (apic_verify()) | |
1772 | return -1; | |
be7a656f | 1773 | } |
be7a656f YL |
1774 | |
1775 | apic_pm_activate(); | |
1776 | ||
1777 | return 0; | |
1778 | ||
1779 | no_apic: | |
ba21ebb6 | 1780 | pr_info("No local APIC present or hardware disabled\n"); |
be7a656f YL |
1781 | return -1; |
1782 | } | |
1783 | #endif | |
1da177e4 | 1784 | |
0e078e2f TG |
1785 | /** |
1786 | * init_apic_mappings - initialize APIC mappings | |
1787 | */ | |
1da177e4 LT |
1788 | void __init init_apic_mappings(void) |
1789 | { | |
4401da61 YL |
1790 | unsigned int new_apicid; |
1791 | ||
fc1edaf9 | 1792 | if (x2apic_mode) { |
4c9961d5 | 1793 | boot_cpu_physical_apicid = read_apic_id(); |
6e1cb38a SS |
1794 | return; |
1795 | } | |
1796 | ||
4797f6b0 | 1797 | /* If no local APIC can be found return early */ |
1da177e4 | 1798 | if (!smp_found_config && detect_init_APIC()) { |
4797f6b0 YL |
1799 | /* lets NOP'ify apic operations */ |
1800 | pr_info("APIC: disable apic facility\n"); | |
1801 | apic_disable(); | |
1802 | } else { | |
1da177e4 LT |
1803 | apic_phys = mp_lapic_addr; |
1804 | ||
4797f6b0 YL |
1805 | /* |
1806 | * acpi lapic path already maps that address in | |
1807 | * acpi_register_lapic_address() | |
1808 | */ | |
5989cd6a | 1809 | if (!acpi_lapic && !smp_found_config) |
326a2e6b | 1810 | register_lapic_address(apic_phys); |
cec6be6d | 1811 | } |
1da177e4 LT |
1812 | |
1813 | /* | |
1814 | * Fetch the APIC ID of the BSP in case we have a | |
1815 | * default configuration (or the MP table is broken). | |
1816 | */ | |
4401da61 YL |
1817 | new_apicid = read_apic_id(); |
1818 | if (boot_cpu_physical_apicid != new_apicid) { | |
1819 | boot_cpu_physical_apicid = new_apicid; | |
103428e5 CG |
1820 | /* |
1821 | * yeah -- we lie about apic_version | |
1822 | * in case if apic was disabled via boot option | |
1823 | * but it's not a problem for SMP compiled kernel | |
1824 | * since smp_sanity_check is prepared for such a case | |
1825 | * and disable smp mode | |
1826 | */ | |
4401da61 YL |
1827 | apic_version[new_apicid] = |
1828 | GET_APIC_VERSION(apic_read(APIC_LVR)); | |
08306ce6 | 1829 | } |
1da177e4 LT |
1830 | } |
1831 | ||
c0104d38 YL |
1832 | void __init register_lapic_address(unsigned long address) |
1833 | { | |
1834 | mp_lapic_addr = address; | |
1835 | ||
0450193b YL |
1836 | if (!x2apic_mode) { |
1837 | set_fixmap_nocache(FIX_APIC_BASE, address); | |
1838 | apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n", | |
1839 | APIC_BASE, mp_lapic_addr); | |
1840 | } | |
c0104d38 YL |
1841 | if (boot_cpu_physical_apicid == -1U) { |
1842 | boot_cpu_physical_apicid = read_apic_id(); | |
1843 | apic_version[boot_cpu_physical_apicid] = | |
1844 | GET_APIC_VERSION(apic_read(APIC_LVR)); | |
1845 | } | |
1846 | } | |
1847 | ||
1da177e4 | 1848 | /* |
0e078e2f TG |
1849 | * This initializes the IO-APIC and APIC hardware if this is |
1850 | * a UP kernel. | |
1da177e4 | 1851 | */ |
56d91f13 | 1852 | int apic_version[MAX_LOCAL_APIC]; |
1b313f4a | 1853 | |
0e078e2f | 1854 | int __init APIC_init_uniprocessor(void) |
1da177e4 | 1855 | { |
0e078e2f | 1856 | if (disable_apic) { |
ba21ebb6 | 1857 | pr_info("Apic disabled\n"); |
0e078e2f TG |
1858 | return -1; |
1859 | } | |
f1182638 | 1860 | #ifdef CONFIG_X86_64 |
0e078e2f TG |
1861 | if (!cpu_has_apic) { |
1862 | disable_apic = 1; | |
ba21ebb6 | 1863 | pr_info("Apic disabled by BIOS\n"); |
0e078e2f TG |
1864 | return -1; |
1865 | } | |
fa2bd35a YL |
1866 | #else |
1867 | if (!smp_found_config && !cpu_has_apic) | |
1868 | return -1; | |
1869 | ||
1870 | /* | |
1871 | * Complain if the BIOS pretends there is one. | |
1872 | */ | |
1873 | if (!cpu_has_apic && | |
1874 | APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) { | |
ba21ebb6 CG |
1875 | pr_err("BIOS bug, local APIC 0x%x not detected!...\n", |
1876 | boot_cpu_physical_apicid); | |
fa2bd35a YL |
1877 | return -1; |
1878 | } | |
1879 | #endif | |
1880 | ||
72ce0165 | 1881 | default_setup_apic_routing(); |
6e1cb38a | 1882 | |
0e078e2f | 1883 | verify_local_APIC(); |
b5841765 GC |
1884 | connect_bsp_APIC(); |
1885 | ||
fa2bd35a | 1886 | #ifdef CONFIG_X86_64 |
c70dcb74 | 1887 | apic_write(APIC_ID, SET_APIC_ID(boot_cpu_physical_apicid)); |
fa2bd35a YL |
1888 | #else |
1889 | /* | |
1890 | * Hack: In case of kdump, after a crash, kernel might be booting | |
1891 | * on a cpu with non-zero lapic id. But boot_cpu_physical_apicid | |
1892 | * might be zero if read from MP tables. Get it from LAPIC. | |
1893 | */ | |
1894 | # ifdef CONFIG_CRASH_DUMP | |
1895 | boot_cpu_physical_apicid = read_apic_id(); | |
1896 | # endif | |
1897 | #endif | |
1898 | physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map); | |
0e078e2f | 1899 | setup_local_APIC(); |
1da177e4 | 1900 | |
88d0f550 | 1901 | #ifdef CONFIG_X86_IO_APIC |
739f33b3 AK |
1902 | /* |
1903 | * Now enable IO-APICs, actually call clear_IO_APIC | |
98c061b6 | 1904 | * We need clear_IO_APIC before enabling error vector |
739f33b3 AK |
1905 | */ |
1906 | if (!skip_ioapic_setup && nr_ioapics) | |
1907 | enable_IO_APIC(); | |
fa2bd35a | 1908 | #endif |
739f33b3 | 1909 | |
2fb270f3 | 1910 | bsp_end_local_APIC_setup(); |
739f33b3 | 1911 | |
fa2bd35a | 1912 | #ifdef CONFIG_X86_IO_APIC |
0e078e2f TG |
1913 | if (smp_found_config && !skip_ioapic_setup && nr_ioapics) |
1914 | setup_IO_APIC(); | |
98c061b6 | 1915 | else { |
0e078e2f | 1916 | nr_ioapics = 0; |
98c061b6 | 1917 | } |
fa2bd35a YL |
1918 | #endif |
1919 | ||
736decac | 1920 | x86_init.timers.setup_percpu_clockev(); |
0e078e2f | 1921 | return 0; |
1da177e4 LT |
1922 | } |
1923 | ||
1924 | /* | |
0e078e2f | 1925 | * Local APIC interrupts |
1da177e4 LT |
1926 | */ |
1927 | ||
0e078e2f TG |
1928 | /* |
1929 | * This interrupt should _never_ happen with our APIC/SMP architecture | |
1930 | */ | |
eddc0e92 | 1931 | static inline void __smp_spurious_interrupt(void) |
1da177e4 | 1932 | { |
dc1528dd YL |
1933 | u32 v; |
1934 | ||
1da177e4 | 1935 | /* |
0e078e2f TG |
1936 | * Check if this really is a spurious interrupt and ACK it |
1937 | * if it is a vectored one. Just in case... | |
1938 | * Spurious interrupts should not be ACKed. | |
1da177e4 | 1939 | */ |
0e078e2f TG |
1940 | v = apic_read(APIC_ISR + ((SPURIOUS_APIC_VECTOR & ~0x1f) >> 1)); |
1941 | if (v & (1 << (SPURIOUS_APIC_VECTOR & 0x1f))) | |
1942 | ack_APIC_irq(); | |
c4d58cbd | 1943 | |
915b0d01 HS |
1944 | inc_irq_stat(irq_spurious_count); |
1945 | ||
dc1528dd | 1946 | /* see sw-dev-man vol 3, chapter 7.4.13.5 */ |
ba21ebb6 CG |
1947 | pr_info("spurious APIC interrupt on CPU#%d, " |
1948 | "should never happen.\n", smp_processor_id()); | |
eddc0e92 SA |
1949 | } |
1950 | ||
1951 | void smp_spurious_interrupt(struct pt_regs *regs) | |
1952 | { | |
1953 | entering_irq(); | |
1954 | __smp_spurious_interrupt(); | |
1955 | exiting_irq(); | |
0e078e2f | 1956 | } |
1da177e4 | 1957 | |
cf910e83 SA |
1958 | void smp_trace_spurious_interrupt(struct pt_regs *regs) |
1959 | { | |
1960 | entering_irq(); | |
1961 | trace_spurious_apic_entry(SPURIOUS_APIC_VECTOR); | |
1962 | __smp_spurious_interrupt(); | |
1963 | trace_spurious_apic_exit(SPURIOUS_APIC_VECTOR); | |
1964 | exiting_irq(); | |
1965 | } | |
1966 | ||
0e078e2f TG |
1967 | /* |
1968 | * This interrupt should never happen with our APIC/SMP architecture | |
1969 | */ | |
eddc0e92 | 1970 | static inline void __smp_error_interrupt(struct pt_regs *regs) |
0e078e2f | 1971 | { |
2b398bd9 YS |
1972 | u32 v0, v1; |
1973 | u32 i = 0; | |
1974 | static const char * const error_interrupt_reason[] = { | |
1975 | "Send CS error", /* APIC Error Bit 0 */ | |
1976 | "Receive CS error", /* APIC Error Bit 1 */ | |
1977 | "Send accept error", /* APIC Error Bit 2 */ | |
1978 | "Receive accept error", /* APIC Error Bit 3 */ | |
1979 | "Redirectable IPI", /* APIC Error Bit 4 */ | |
1980 | "Send illegal vector", /* APIC Error Bit 5 */ | |
1981 | "Received illegal vector", /* APIC Error Bit 6 */ | |
1982 | "Illegal register address", /* APIC Error Bit 7 */ | |
1983 | }; | |
1da177e4 | 1984 | |
0e078e2f | 1985 | /* First tickle the hardware, only then report what went on. -- REW */ |
2b398bd9 | 1986 | v0 = apic_read(APIC_ESR); |
0e078e2f TG |
1987 | apic_write(APIC_ESR, 0); |
1988 | v1 = apic_read(APIC_ESR); | |
1989 | ack_APIC_irq(); | |
1990 | atomic_inc(&irq_err_count); | |
ba7eda4c | 1991 | |
2b398bd9 YS |
1992 | apic_printk(APIC_DEBUG, KERN_DEBUG "APIC error on CPU%d: %02x(%02x)", |
1993 | smp_processor_id(), v0 , v1); | |
1994 | ||
1995 | v1 = v1 & 0xff; | |
1996 | while (v1) { | |
1997 | if (v1 & 0x1) | |
1998 | apic_printk(APIC_DEBUG, KERN_CONT " : %s", error_interrupt_reason[i]); | |
1999 | i++; | |
2000 | v1 >>= 1; | |
4b8073e4 | 2001 | } |
2b398bd9 YS |
2002 | |
2003 | apic_printk(APIC_DEBUG, KERN_CONT "\n"); | |
2004 | ||
eddc0e92 SA |
2005 | } |
2006 | ||
2007 | void smp_error_interrupt(struct pt_regs *regs) | |
2008 | { | |
2009 | entering_irq(); | |
2010 | __smp_error_interrupt(regs); | |
2011 | exiting_irq(); | |
1da177e4 LT |
2012 | } |
2013 | ||
cf910e83 SA |
2014 | void smp_trace_error_interrupt(struct pt_regs *regs) |
2015 | { | |
2016 | entering_irq(); | |
2017 | trace_error_apic_entry(ERROR_APIC_VECTOR); | |
2018 | __smp_error_interrupt(regs); | |
2019 | trace_error_apic_exit(ERROR_APIC_VECTOR); | |
2020 | exiting_irq(); | |
2021 | } | |
2022 | ||
b5841765 | 2023 | /** |
36c9d674 CG |
2024 | * connect_bsp_APIC - attach the APIC to the interrupt system |
2025 | */ | |
b5841765 GC |
2026 | void __init connect_bsp_APIC(void) |
2027 | { | |
36c9d674 CG |
2028 | #ifdef CONFIG_X86_32 |
2029 | if (pic_mode) { | |
2030 | /* | |
2031 | * Do not trust the local APIC being empty at bootup. | |
2032 | */ | |
2033 | clear_local_APIC(); | |
2034 | /* | |
2035 | * PIC mode, enable APIC mode in the IMCR, i.e. connect BSP's | |
2036 | * local APIC to INT and NMI lines. | |
2037 | */ | |
2038 | apic_printk(APIC_VERBOSE, "leaving PIC mode, " | |
2039 | "enabling APIC mode.\n"); | |
c0eaa453 | 2040 | imcr_pic_to_apic(); |
36c9d674 CG |
2041 | } |
2042 | #endif | |
49040333 IM |
2043 | if (apic->enable_apic_mode) |
2044 | apic->enable_apic_mode(); | |
b5841765 GC |
2045 | } |
2046 | ||
274cfe59 CG |
2047 | /** |
2048 | * disconnect_bsp_APIC - detach the APIC from the interrupt system | |
2049 | * @virt_wire_setup: indicates, whether virtual wire mode is selected | |
2050 | * | |
2051 | * Virtual wire mode is necessary to deliver legacy interrupts even when the | |
2052 | * APIC is disabled. | |
2053 | */ | |
0e078e2f | 2054 | void disconnect_bsp_APIC(int virt_wire_setup) |
1da177e4 | 2055 | { |
1b4ee4e4 CG |
2056 | unsigned int value; |
2057 | ||
c177b0bc CG |
2058 | #ifdef CONFIG_X86_32 |
2059 | if (pic_mode) { | |
2060 | /* | |
2061 | * Put the board back into PIC mode (has an effect only on | |
2062 | * certain older boards). Note that APIC interrupts, including | |
2063 | * IPIs, won't work beyond this point! The only exception are | |
2064 | * INIT IPIs. | |
2065 | */ | |
2066 | apic_printk(APIC_VERBOSE, "disabling APIC mode, " | |
2067 | "entering PIC mode.\n"); | |
c0eaa453 | 2068 | imcr_apic_to_pic(); |
c177b0bc CG |
2069 | return; |
2070 | } | |
2071 | #endif | |
2072 | ||
0e078e2f | 2073 | /* Go back to Virtual Wire compatibility mode */ |
1da177e4 | 2074 | |
0e078e2f TG |
2075 | /* For the spurious interrupt use vector F, and enable it */ |
2076 | value = apic_read(APIC_SPIV); | |
2077 | value &= ~APIC_VECTOR_MASK; | |
2078 | value |= APIC_SPIV_APIC_ENABLED; | |
2079 | value |= 0xf; | |
2080 | apic_write(APIC_SPIV, value); | |
b8ce3359 | 2081 | |
0e078e2f TG |
2082 | if (!virt_wire_setup) { |
2083 | /* | |
2084 | * For LVT0 make it edge triggered, active high, | |
2085 | * external and enabled | |
2086 | */ | |
2087 | value = apic_read(APIC_LVT0); | |
2088 | value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING | | |
2089 | APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR | | |
2090 | APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED); | |
2091 | value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING; | |
2092 | value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_EXTINT); | |
2093 | apic_write(APIC_LVT0, value); | |
2094 | } else { | |
2095 | /* Disable LVT0 */ | |
2096 | apic_write(APIC_LVT0, APIC_LVT_MASKED); | |
2097 | } | |
b8ce3359 | 2098 | |
c177b0bc CG |
2099 | /* |
2100 | * For LVT1 make it edge triggered, active high, | |
2101 | * nmi and enabled | |
2102 | */ | |
0e078e2f TG |
2103 | value = apic_read(APIC_LVT1); |
2104 | value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING | | |
2105 | APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR | | |
2106 | APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED); | |
2107 | value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING; | |
2108 | value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_NMI); | |
2109 | apic_write(APIC_LVT1, value); | |
1da177e4 LT |
2110 | } |
2111 | ||
be8a5685 AS |
2112 | void __cpuinit generic_processor_info(int apicid, int version) |
2113 | { | |
14cb6dcf VG |
2114 | int cpu, max = nr_cpu_ids; |
2115 | bool boot_cpu_detected = physid_isset(boot_cpu_physical_apicid, | |
2116 | phys_cpu_present_map); | |
2117 | ||
2118 | /* | |
2119 | * If boot cpu has not been detected yet, then only allow upto | |
2120 | * nr_cpu_ids - 1 processors and keep one slot free for boot cpu | |
2121 | */ | |
2122 | if (!boot_cpu_detected && num_processors >= nr_cpu_ids - 1 && | |
2123 | apicid != boot_cpu_physical_apicid) { | |
2124 | int thiscpu = max + disabled_cpus - 1; | |
2125 | ||
2126 | pr_warning( | |
2127 | "ACPI: NR_CPUS/possible_cpus limit of %i almost" | |
2128 | " reached. Keeping one slot for boot cpu." | |
2129 | " Processor %d/0x%x ignored.\n", max, thiscpu, apicid); | |
2130 | ||
2131 | disabled_cpus++; | |
2132 | return; | |
2133 | } | |
be8a5685 | 2134 | |
3b11ce7f | 2135 | if (num_processors >= nr_cpu_ids) { |
3b11ce7f MT |
2136 | int thiscpu = max + disabled_cpus; |
2137 | ||
2138 | pr_warning( | |
2139 | "ACPI: NR_CPUS/possible_cpus limit of %i reached." | |
2140 | " Processor %d/0x%x ignored.\n", max, thiscpu, apicid); | |
2141 | ||
2142 | disabled_cpus++; | |
be8a5685 AS |
2143 | return; |
2144 | } | |
2145 | ||
2146 | num_processors++; | |
be8a5685 AS |
2147 | if (apicid == boot_cpu_physical_apicid) { |
2148 | /* | |
2149 | * x86_bios_cpu_apicid is required to have processors listed | |
2150 | * in same order as logical cpu numbers. Hence the first | |
2151 | * entry is BSP, and so on. | |
e5fea868 YL |
2152 | * boot_cpu_init() already hold bit 0 in cpu_present_mask |
2153 | * for BSP. | |
be8a5685 AS |
2154 | */ |
2155 | cpu = 0; | |
e5fea868 YL |
2156 | } else |
2157 | cpu = cpumask_next_zero(-1, cpu_present_mask); | |
2158 | ||
2159 | /* | |
2160 | * Validate version | |
2161 | */ | |
2162 | if (version == 0x0) { | |
2163 | pr_warning("BIOS bug: APIC version is 0 for CPU %d/0x%x, fixing up to 0x10\n", | |
2164 | cpu, apicid); | |
2165 | version = 0x10; | |
be8a5685 | 2166 | } |
e5fea868 YL |
2167 | apic_version[apicid] = version; |
2168 | ||
2169 | if (version != apic_version[boot_cpu_physical_apicid]) { | |
2170 | pr_warning("BIOS bug: APIC version mismatch, boot CPU: %x, CPU %d: version %x\n", | |
2171 | apic_version[boot_cpu_physical_apicid], cpu, version); | |
2172 | } | |
2173 | ||
2174 | physid_set(apicid, phys_cpu_present_map); | |
e0da3364 YL |
2175 | if (apicid > max_physical_apicid) |
2176 | max_physical_apicid = apicid; | |
2177 | ||
3e5095d1 | 2178 | #if defined(CONFIG_SMP) || defined(CONFIG_X86_64) |
f10fcd47 TH |
2179 | early_per_cpu(x86_cpu_to_apicid, cpu) = apicid; |
2180 | early_per_cpu(x86_bios_cpu_apicid, cpu) = apicid; | |
1b313f4a | 2181 | #endif |
acb8bc09 TH |
2182 | #ifdef CONFIG_X86_32 |
2183 | early_per_cpu(x86_cpu_to_logical_apicid, cpu) = | |
2184 | apic->x86_32_early_logical_apicid(cpu); | |
2185 | #endif | |
1de88cd4 MT |
2186 | set_cpu_possible(cpu, true); |
2187 | set_cpu_present(cpu, true); | |
be8a5685 AS |
2188 | } |
2189 | ||
0c81c746 SS |
2190 | int hard_smp_processor_id(void) |
2191 | { | |
2192 | return read_apic_id(); | |
2193 | } | |
1dcdd3d1 IM |
2194 | |
2195 | void default_init_apic_ldr(void) | |
2196 | { | |
2197 | unsigned long val; | |
2198 | ||
2199 | apic_write(APIC_DFR, APIC_DFR_VALUE); | |
2200 | val = apic_read(APIC_LDR) & ~APIC_LDR_MASK; | |
2201 | val |= SET_APIC_LOGICAL_ID(1UL << smp_processor_id()); | |
2202 | apic_write(APIC_LDR, val); | |
2203 | } | |
2204 | ||
ff164324 AG |
2205 | int default_cpu_mask_to_apicid_and(const struct cpumask *cpumask, |
2206 | const struct cpumask *andmask, | |
2207 | unsigned int *apicid) | |
6398268d | 2208 | { |
ea3807ea | 2209 | unsigned int cpu; |
6398268d AG |
2210 | |
2211 | for_each_cpu_and(cpu, cpumask, andmask) { | |
2212 | if (cpumask_test_cpu(cpu, cpu_online_mask)) | |
2213 | break; | |
2214 | } | |
ff164324 | 2215 | |
ea3807ea | 2216 | if (likely(cpu < nr_cpu_ids)) { |
a5a39156 AG |
2217 | *apicid = per_cpu(x86_cpu_to_apicid, cpu); |
2218 | return 0; | |
a5a39156 | 2219 | } |
ea3807ea AG |
2220 | |
2221 | return -EINVAL; | |
6398268d AG |
2222 | } |
2223 | ||
1551df64 MT |
2224 | /* |
2225 | * Override the generic EOI implementation with an optimized version. | |
2226 | * Only called during early boot when only one CPU is active and with | |
2227 | * interrupts disabled, so we know this does not race with actual APIC driver | |
2228 | * use. | |
2229 | */ | |
2230 | void __init apic_set_eoi_write(void (*eoi_write)(u32 reg, u32 v)) | |
2231 | { | |
2232 | struct apic **drv; | |
2233 | ||
2234 | for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) { | |
2235 | /* Should happen once for each apic */ | |
2236 | WARN_ON((*drv)->eoi_write == eoi_write); | |
2237 | (*drv)->eoi_write = eoi_write; | |
2238 | } | |
2239 | } | |
2240 | ||
89039b37 | 2241 | /* |
0e078e2f | 2242 | * Power management |
89039b37 | 2243 | */ |
0e078e2f TG |
2244 | #ifdef CONFIG_PM |
2245 | ||
2246 | static struct { | |
274cfe59 CG |
2247 | /* |
2248 | * 'active' is true if the local APIC was enabled by us and | |
2249 | * not the BIOS; this signifies that we are also responsible | |
2250 | * for disabling it before entering apm/acpi suspend | |
2251 | */ | |
0e078e2f TG |
2252 | int active; |
2253 | /* r/w apic fields */ | |
2254 | unsigned int apic_id; | |
2255 | unsigned int apic_taskpri; | |
2256 | unsigned int apic_ldr; | |
2257 | unsigned int apic_dfr; | |
2258 | unsigned int apic_spiv; | |
2259 | unsigned int apic_lvtt; | |
2260 | unsigned int apic_lvtpc; | |
2261 | unsigned int apic_lvt0; | |
2262 | unsigned int apic_lvt1; | |
2263 | unsigned int apic_lvterr; | |
2264 | unsigned int apic_tmict; | |
2265 | unsigned int apic_tdcr; | |
2266 | unsigned int apic_thmr; | |
2267 | } apic_pm_state; | |
2268 | ||
f3c6ea1b | 2269 | static int lapic_suspend(void) |
0e078e2f TG |
2270 | { |
2271 | unsigned long flags; | |
2272 | int maxlvt; | |
89039b37 | 2273 | |
0e078e2f TG |
2274 | if (!apic_pm_state.active) |
2275 | return 0; | |
89039b37 | 2276 | |
0e078e2f | 2277 | maxlvt = lapic_get_maxlvt(); |
89039b37 | 2278 | |
2d7a66d0 | 2279 | apic_pm_state.apic_id = apic_read(APIC_ID); |
0e078e2f TG |
2280 | apic_pm_state.apic_taskpri = apic_read(APIC_TASKPRI); |
2281 | apic_pm_state.apic_ldr = apic_read(APIC_LDR); | |
2282 | apic_pm_state.apic_dfr = apic_read(APIC_DFR); | |
2283 | apic_pm_state.apic_spiv = apic_read(APIC_SPIV); | |
2284 | apic_pm_state.apic_lvtt = apic_read(APIC_LVTT); | |
2285 | if (maxlvt >= 4) | |
2286 | apic_pm_state.apic_lvtpc = apic_read(APIC_LVTPC); | |
2287 | apic_pm_state.apic_lvt0 = apic_read(APIC_LVT0); | |
2288 | apic_pm_state.apic_lvt1 = apic_read(APIC_LVT1); | |
2289 | apic_pm_state.apic_lvterr = apic_read(APIC_LVTERR); | |
2290 | apic_pm_state.apic_tmict = apic_read(APIC_TMICT); | |
2291 | apic_pm_state.apic_tdcr = apic_read(APIC_TDCR); | |
4efc0670 | 2292 | #ifdef CONFIG_X86_THERMAL_VECTOR |
0e078e2f TG |
2293 | if (maxlvt >= 5) |
2294 | apic_pm_state.apic_thmr = apic_read(APIC_LVTTHMR); | |
2295 | #endif | |
24968cfd | 2296 | |
0e078e2f TG |
2297 | local_irq_save(flags); |
2298 | disable_local_APIC(); | |
fc1edaf9 | 2299 | |
70733e0c | 2300 | irq_remapping_disable(); |
fc1edaf9 | 2301 | |
0e078e2f TG |
2302 | local_irq_restore(flags); |
2303 | return 0; | |
1da177e4 LT |
2304 | } |
2305 | ||
f3c6ea1b | 2306 | static void lapic_resume(void) |
1da177e4 | 2307 | { |
0e078e2f TG |
2308 | unsigned int l, h; |
2309 | unsigned long flags; | |
31dce14a | 2310 | int maxlvt; |
b24696bc | 2311 | |
0e078e2f | 2312 | if (!apic_pm_state.active) |
f3c6ea1b | 2313 | return; |
89b831ef | 2314 | |
0e078e2f | 2315 | local_irq_save(flags); |
336224ba JR |
2316 | |
2317 | /* | |
2318 | * IO-APIC and PIC have their own resume routines. | |
2319 | * We just mask them here to make sure the interrupt | |
2320 | * subsystem is completely quiet while we enable x2apic | |
2321 | * and interrupt-remapping. | |
2322 | */ | |
2323 | mask_ioapic_entries(); | |
2324 | legacy_pic->mask_all(); | |
92206c90 | 2325 | |
fc1edaf9 | 2326 | if (x2apic_mode) |
92206c90 | 2327 | enable_x2apic(); |
cf6567fe | 2328 | else { |
92206c90 CG |
2329 | /* |
2330 | * Make sure the APICBASE points to the right address | |
2331 | * | |
2332 | * FIXME! This will be wrong if we ever support suspend on | |
2333 | * SMP! We'll need to do this as part of the CPU restore! | |
2334 | */ | |
cbf2829b BD |
2335 | if (boot_cpu_data.x86 >= 6) { |
2336 | rdmsr(MSR_IA32_APICBASE, l, h); | |
2337 | l &= ~MSR_IA32_APICBASE_BASE; | |
2338 | l |= MSR_IA32_APICBASE_ENABLE | mp_lapic_addr; | |
2339 | wrmsr(MSR_IA32_APICBASE, l, h); | |
2340 | } | |
d5e629a6 | 2341 | } |
6e1cb38a | 2342 | |
b24696bc | 2343 | maxlvt = lapic_get_maxlvt(); |
0e078e2f TG |
2344 | apic_write(APIC_LVTERR, ERROR_APIC_VECTOR | APIC_LVT_MASKED); |
2345 | apic_write(APIC_ID, apic_pm_state.apic_id); | |
2346 | apic_write(APIC_DFR, apic_pm_state.apic_dfr); | |
2347 | apic_write(APIC_LDR, apic_pm_state.apic_ldr); | |
2348 | apic_write(APIC_TASKPRI, apic_pm_state.apic_taskpri); | |
2349 | apic_write(APIC_SPIV, apic_pm_state.apic_spiv); | |
2350 | apic_write(APIC_LVT0, apic_pm_state.apic_lvt0); | |
2351 | apic_write(APIC_LVT1, apic_pm_state.apic_lvt1); | |
92206c90 | 2352 | #if defined(CONFIG_X86_MCE_P4THERMAL) || defined(CONFIG_X86_MCE_INTEL) |
0e078e2f TG |
2353 | if (maxlvt >= 5) |
2354 | apic_write(APIC_LVTTHMR, apic_pm_state.apic_thmr); | |
2355 | #endif | |
2356 | if (maxlvt >= 4) | |
2357 | apic_write(APIC_LVTPC, apic_pm_state.apic_lvtpc); | |
2358 | apic_write(APIC_LVTT, apic_pm_state.apic_lvtt); | |
2359 | apic_write(APIC_TDCR, apic_pm_state.apic_tdcr); | |
2360 | apic_write(APIC_TMICT, apic_pm_state.apic_tmict); | |
2361 | apic_write(APIC_ESR, 0); | |
2362 | apic_read(APIC_ESR); | |
2363 | apic_write(APIC_LVTERR, apic_pm_state.apic_lvterr); | |
2364 | apic_write(APIC_ESR, 0); | |
2365 | apic_read(APIC_ESR); | |
92206c90 | 2366 | |
70733e0c | 2367 | irq_remapping_reenable(x2apic_mode); |
31dce14a | 2368 | |
0e078e2f | 2369 | local_irq_restore(flags); |
0e078e2f | 2370 | } |
b8ce3359 | 2371 | |
274cfe59 CG |
2372 | /* |
2373 | * This device has no shutdown method - fully functioning local APICs | |
2374 | * are needed on every CPU up until machine_halt/restart/poweroff. | |
2375 | */ | |
2376 | ||
f3c6ea1b | 2377 | static struct syscore_ops lapic_syscore_ops = { |
0e078e2f TG |
2378 | .resume = lapic_resume, |
2379 | .suspend = lapic_suspend, | |
2380 | }; | |
b8ce3359 | 2381 | |
0e078e2f TG |
2382 | static void __cpuinit apic_pm_activate(void) |
2383 | { | |
2384 | apic_pm_state.active = 1; | |
1da177e4 LT |
2385 | } |
2386 | ||
0e078e2f | 2387 | static int __init init_lapic_sysfs(void) |
1da177e4 | 2388 | { |
0e078e2f | 2389 | /* XXX: remove suspend/resume procs if !apic_pm_state.active? */ |
f3c6ea1b RW |
2390 | if (cpu_has_apic) |
2391 | register_syscore_ops(&lapic_syscore_ops); | |
e83a5fdc | 2392 | |
f3c6ea1b | 2393 | return 0; |
1da177e4 | 2394 | } |
b24696bc FY |
2395 | |
2396 | /* local apic needs to resume before other devices access its registers. */ | |
2397 | core_initcall(init_lapic_sysfs); | |
0e078e2f TG |
2398 | |
2399 | #else /* CONFIG_PM */ | |
2400 | ||
2401 | static void apic_pm_activate(void) { } | |
2402 | ||
2403 | #endif /* CONFIG_PM */ | |
1da177e4 | 2404 | |
f28c0ae2 | 2405 | #ifdef CONFIG_X86_64 |
e0e42142 YL |
2406 | |
2407 | static int __cpuinit apic_cluster_num(void) | |
1da177e4 LT |
2408 | { |
2409 | int i, clusters, zeros; | |
2410 | unsigned id; | |
322850af | 2411 | u16 *bios_cpu_apicid; |
1da177e4 LT |
2412 | DECLARE_BITMAP(clustermap, NUM_APIC_CLUSTERS); |
2413 | ||
23ca4bba | 2414 | bios_cpu_apicid = early_per_cpu_ptr(x86_bios_cpu_apicid); |
376ec33f | 2415 | bitmap_zero(clustermap, NUM_APIC_CLUSTERS); |
1da177e4 | 2416 | |
168ef543 | 2417 | for (i = 0; i < nr_cpu_ids; i++) { |
e8c10ef9 | 2418 | /* are we being called early in kernel startup? */ |
693e3c56 MT |
2419 | if (bios_cpu_apicid) { |
2420 | id = bios_cpu_apicid[i]; | |
e423e33e | 2421 | } else if (i < nr_cpu_ids) { |
e8c10ef9 | 2422 | if (cpu_present(i)) |
2423 | id = per_cpu(x86_bios_cpu_apicid, i); | |
2424 | else | |
2425 | continue; | |
e423e33e | 2426 | } else |
e8c10ef9 | 2427 | break; |
2428 | ||
1da177e4 LT |
2429 | if (id != BAD_APICID) |
2430 | __set_bit(APIC_CLUSTERID(id), clustermap); | |
2431 | } | |
2432 | ||
2433 | /* Problem: Partially populated chassis may not have CPUs in some of | |
2434 | * the APIC clusters they have been allocated. Only present CPUs have | |
602a54a8 | 2435 | * x86_bios_cpu_apicid entries, thus causing zeroes in the bitmap. |
2436 | * Since clusters are allocated sequentially, count zeros only if | |
2437 | * they are bounded by ones. | |
1da177e4 LT |
2438 | */ |
2439 | clusters = 0; | |
2440 | zeros = 0; | |
2441 | for (i = 0; i < NUM_APIC_CLUSTERS; i++) { | |
2442 | if (test_bit(i, clustermap)) { | |
2443 | clusters += 1 + zeros; | |
2444 | zeros = 0; | |
2445 | } else | |
2446 | ++zeros; | |
2447 | } | |
2448 | ||
e0e42142 YL |
2449 | return clusters; |
2450 | } | |
2451 | ||
2452 | static int __cpuinitdata multi_checked; | |
2453 | static int __cpuinitdata multi; | |
2454 | ||
2455 | static int __cpuinit set_multi(const struct dmi_system_id *d) | |
2456 | { | |
2457 | if (multi) | |
2458 | return 0; | |
6f0aced6 | 2459 | pr_info("APIC: %s detected, Multi Chassis\n", d->ident); |
e0e42142 YL |
2460 | multi = 1; |
2461 | return 0; | |
2462 | } | |
2463 | ||
2464 | static const __cpuinitconst struct dmi_system_id multi_dmi_table[] = { | |
2465 | { | |
2466 | .callback = set_multi, | |
2467 | .ident = "IBM System Summit2", | |
2468 | .matches = { | |
2469 | DMI_MATCH(DMI_SYS_VENDOR, "IBM"), | |
2470 | DMI_MATCH(DMI_PRODUCT_NAME, "Summit2"), | |
2471 | }, | |
2472 | }, | |
2473 | {} | |
2474 | }; | |
2475 | ||
2476 | static void __cpuinit dmi_check_multi(void) | |
2477 | { | |
2478 | if (multi_checked) | |
2479 | return; | |
2480 | ||
2481 | dmi_check_system(multi_dmi_table); | |
2482 | multi_checked = 1; | |
2483 | } | |
2484 | ||
2485 | /* | |
2486 | * apic_is_clustered_box() -- Check if we can expect good TSC | |
2487 | * | |
2488 | * Thus far, the major user of this is IBM's Summit2 series: | |
2489 | * Clustered boxes may have unsynced TSC problems if they are | |
2490 | * multi-chassis. | |
2491 | * Use DMI to check them | |
2492 | */ | |
2493 | __cpuinit int apic_is_clustered_box(void) | |
2494 | { | |
2495 | dmi_check_multi(); | |
2496 | if (multi) | |
1cb68487 RT |
2497 | return 1; |
2498 | ||
e0e42142 YL |
2499 | if (!is_vsmp_box()) |
2500 | return 0; | |
2501 | ||
1da177e4 | 2502 | /* |
e0e42142 YL |
2503 | * ScaleMP vSMPowered boxes have one cluster per board and TSCs are |
2504 | * not guaranteed to be synced between boards | |
1da177e4 | 2505 | */ |
e0e42142 YL |
2506 | if (apic_cluster_num() > 1) |
2507 | return 1; | |
2508 | ||
2509 | return 0; | |
1da177e4 | 2510 | } |
f28c0ae2 | 2511 | #endif |
1da177e4 LT |
2512 | |
2513 | /* | |
0e078e2f | 2514 | * APIC command line parameters |
1da177e4 | 2515 | */ |
789fa735 | 2516 | static int __init setup_disableapic(char *arg) |
6935d1f9 | 2517 | { |
1da177e4 | 2518 | disable_apic = 1; |
9175fc06 | 2519 | setup_clear_cpu_cap(X86_FEATURE_APIC); |
2c8c0e6b AK |
2520 | return 0; |
2521 | } | |
2522 | early_param("disableapic", setup_disableapic); | |
1da177e4 | 2523 | |
2c8c0e6b | 2524 | /* same as disableapic, for compatibility */ |
789fa735 | 2525 | static int __init setup_nolapic(char *arg) |
6935d1f9 | 2526 | { |
789fa735 | 2527 | return setup_disableapic(arg); |
6935d1f9 | 2528 | } |
2c8c0e6b | 2529 | early_param("nolapic", setup_nolapic); |
1da177e4 | 2530 | |
2e7c2838 LT |
2531 | static int __init parse_lapic_timer_c2_ok(char *arg) |
2532 | { | |
2533 | local_apic_timer_c2_ok = 1; | |
2534 | return 0; | |
2535 | } | |
2536 | early_param("lapic_timer_c2_ok", parse_lapic_timer_c2_ok); | |
2537 | ||
36fef094 | 2538 | static int __init parse_disable_apic_timer(char *arg) |
6935d1f9 | 2539 | { |
1da177e4 | 2540 | disable_apic_timer = 1; |
36fef094 | 2541 | return 0; |
6935d1f9 | 2542 | } |
36fef094 CG |
2543 | early_param("noapictimer", parse_disable_apic_timer); |
2544 | ||
2545 | static int __init parse_nolapic_timer(char *arg) | |
2546 | { | |
2547 | disable_apic_timer = 1; | |
2548 | return 0; | |
6935d1f9 | 2549 | } |
36fef094 | 2550 | early_param("nolapic_timer", parse_nolapic_timer); |
73dea47f | 2551 | |
79af9bec CG |
2552 | static int __init apic_set_verbosity(char *arg) |
2553 | { | |
2554 | if (!arg) { | |
2555 | #ifdef CONFIG_X86_64 | |
2556 | skip_ioapic_setup = 0; | |
79af9bec CG |
2557 | return 0; |
2558 | #endif | |
2559 | return -EINVAL; | |
2560 | } | |
2561 | ||
2562 | if (strcmp("debug", arg) == 0) | |
2563 | apic_verbosity = APIC_DEBUG; | |
2564 | else if (strcmp("verbose", arg) == 0) | |
2565 | apic_verbosity = APIC_VERBOSE; | |
2566 | else { | |
ba21ebb6 | 2567 | pr_warning("APIC Verbosity level %s not recognised" |
79af9bec CG |
2568 | " use apic=verbose or apic=debug\n", arg); |
2569 | return -EINVAL; | |
2570 | } | |
2571 | ||
2572 | return 0; | |
2573 | } | |
2574 | early_param("apic", apic_set_verbosity); | |
2575 | ||
1e934dda YL |
2576 | static int __init lapic_insert_resource(void) |
2577 | { | |
2578 | if (!apic_phys) | |
2579 | return -1; | |
2580 | ||
2581 | /* Put local APIC into the resource map. */ | |
2582 | lapic_resource.start = apic_phys; | |
2583 | lapic_resource.end = lapic_resource.start + PAGE_SIZE - 1; | |
2584 | insert_resource(&iomem_resource, &lapic_resource); | |
2585 | ||
2586 | return 0; | |
2587 | } | |
2588 | ||
2589 | /* | |
2590 | * need call insert after e820_reserve_resources() | |
2591 | * that is using request_resource | |
2592 | */ | |
2593 | late_initcall(lapic_insert_resource); |