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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 | |
83ab8514 | 38 | #include <asm/trace/irq_vectors.h> |
8a8f422d | 39 | #include <asm/irq_remapping.h> |
cdd6c482 | 40 | #include <asm/perf_event.h> |
736decac | 41 | #include <asm/x86_init.h> |
1da177e4 | 42 | #include <asm/pgalloc.h> |
60063497 | 43 | #include <linux/atomic.h> |
1da177e4 | 44 | #include <asm/mpspec.h> |
d1de36f5 | 45 | #include <asm/i8259.h> |
73dea47f | 46 | #include <asm/proto.h> |
2c8c0e6b | 47 | #include <asm/apic.h> |
7167d08e | 48 | #include <asm/io_apic.h> |
d1de36f5 IM |
49 | #include <asm/desc.h> |
50 | #include <asm/hpet.h> | |
51 | #include <asm/idle.h> | |
52 | #include <asm/mtrr.h> | |
16f871bc | 53 | #include <asm/time.h> |
2bc13797 | 54 | #include <asm/smp.h> |
be71b855 | 55 | #include <asm/mce.h> |
8c3ba8d0 | 56 | #include <asm/tsc.h> |
2904ed8d | 57 | #include <asm/hypervisor.h> |
1da177e4 | 58 | |
ec70de8b | 59 | unsigned int num_processors; |
fdbecd9f | 60 | |
148f9bb8 | 61 | unsigned disabled_cpus; |
fdbecd9f | 62 | |
ec70de8b BG |
63 | /* Processor that is doing the boot up */ |
64 | unsigned int boot_cpu_physical_apicid = -1U; | |
cc08e04c | 65 | EXPORT_SYMBOL_GPL(boot_cpu_physical_apicid); |
5af5573e | 66 | |
80e5609c | 67 | /* |
fdbecd9f | 68 | * The highest APIC ID seen during enumeration. |
80e5609c | 69 | */ |
ec70de8b | 70 | unsigned int max_physical_apicid; |
5af5573e | 71 | |
80e5609c | 72 | /* |
fdbecd9f | 73 | * Bitmask of physically existing CPUs: |
80e5609c | 74 | */ |
ec70de8b BG |
75 | physid_mask_t phys_cpu_present_map; |
76 | ||
151e0c7d HD |
77 | /* |
78 | * Processor to be disabled specified by kernel parameter | |
79 | * disable_cpu_apicid=<int>, mostly used for the kdump 2nd kernel to | |
80 | * avoid undefined behaviour caused by sending INIT from AP to BSP. | |
81 | */ | |
82 | unsigned int disabled_cpu_apicid = BAD_APICID; | |
83 | ||
ec70de8b BG |
84 | /* |
85 | * Map cpu index to physical APIC ID | |
86 | */ | |
0816b0f0 VZ |
87 | DEFINE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_cpu_to_apicid, BAD_APICID); |
88 | DEFINE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_bios_cpu_apicid, BAD_APICID); | |
ec70de8b BG |
89 | EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid); |
90 | EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid); | |
80e5609c | 91 | |
b3c51170 | 92 | #ifdef CONFIG_X86_32 |
4c321ff8 | 93 | |
4c321ff8 TH |
94 | /* |
95 | * On x86_32, the mapping between cpu and logical apicid may vary | |
96 | * depending on apic in use. The following early percpu variable is | |
97 | * used for the mapping. This is where the behaviors of x86_64 and 32 | |
98 | * actually diverge. Let's keep it ugly for now. | |
99 | */ | |
0816b0f0 | 100 | DEFINE_EARLY_PER_CPU_READ_MOSTLY(int, x86_cpu_to_logical_apicid, BAD_APICID); |
4c321ff8 | 101 | |
f28c0ae2 YL |
102 | /* Local APIC was disabled by the BIOS and enabled by the kernel */ |
103 | static int enabled_via_apicbase; | |
104 | ||
c0eaa453 CG |
105 | /* |
106 | * Handle interrupt mode configuration register (IMCR). | |
107 | * This register controls whether the interrupt signals | |
108 | * that reach the BSP come from the master PIC or from the | |
109 | * local APIC. Before entering Symmetric I/O Mode, either | |
110 | * the BIOS or the operating system must switch out of | |
111 | * PIC Mode by changing the IMCR. | |
112 | */ | |
5cda395f | 113 | static inline void imcr_pic_to_apic(void) |
c0eaa453 CG |
114 | { |
115 | /* select IMCR register */ | |
116 | outb(0x70, 0x22); | |
117 | /* NMI and 8259 INTR go through APIC */ | |
118 | outb(0x01, 0x23); | |
119 | } | |
120 | ||
5cda395f | 121 | static inline void imcr_apic_to_pic(void) |
c0eaa453 CG |
122 | { |
123 | /* select IMCR register */ | |
124 | outb(0x70, 0x22); | |
125 | /* NMI and 8259 INTR go directly to BSP */ | |
126 | outb(0x00, 0x23); | |
127 | } | |
b3c51170 YL |
128 | #endif |
129 | ||
279f1461 SS |
130 | /* |
131 | * Knob to control our willingness to enable the local APIC. | |
132 | * | |
133 | * +1=force-enable | |
134 | */ | |
135 | static int force_enable_local_apic __initdata; | |
136 | /* | |
137 | * APIC command line parameters | |
138 | */ | |
139 | static int __init parse_lapic(char *arg) | |
140 | { | |
141 | if (config_enabled(CONFIG_X86_32) && !arg) | |
142 | force_enable_local_apic = 1; | |
27cf9298 | 143 | else if (arg && !strncmp(arg, "notscdeadline", 13)) |
279f1461 SS |
144 | setup_clear_cpu_cap(X86_FEATURE_TSC_DEADLINE_TIMER); |
145 | return 0; | |
146 | } | |
147 | early_param("lapic", parse_lapic); | |
148 | ||
b3c51170 | 149 | #ifdef CONFIG_X86_64 |
bc1d99c1 | 150 | static int apic_calibrate_pmtmr __initdata; |
b3c51170 YL |
151 | static __init int setup_apicpmtimer(char *s) |
152 | { | |
153 | apic_calibrate_pmtmr = 1; | |
154 | notsc_setup(NULL); | |
155 | return 0; | |
156 | } | |
157 | __setup("apicpmtimer", setup_apicpmtimer); | |
158 | #endif | |
159 | ||
fc1edaf9 | 160 | int x2apic_mode; |
06cd9a7d | 161 | #ifdef CONFIG_X86_X2APIC |
6e1cb38a | 162 | /* x2apic enabled before OS handover */ |
fb209bd8 YL |
163 | int x2apic_preenabled; |
164 | static int x2apic_disabled; | |
a31bc327 | 165 | static int nox2apic; |
49899eac YL |
166 | static __init int setup_nox2apic(char *str) |
167 | { | |
39d83a5d | 168 | if (x2apic_enabled()) { |
a31bc327 YL |
169 | int apicid = native_apic_msr_read(APIC_ID); |
170 | ||
171 | if (apicid >= 255) { | |
172 | pr_warning("Apicid: %08x, cannot enforce nox2apic\n", | |
173 | apicid); | |
174 | return 0; | |
175 | } | |
176 | ||
177 | pr_warning("x2apic already enabled. will disable it\n"); | |
178 | } else | |
179 | setup_clear_cpu_cap(X86_FEATURE_X2APIC); | |
180 | ||
181 | nox2apic = 1; | |
39d83a5d | 182 | |
49899eac YL |
183 | return 0; |
184 | } | |
185 | early_param("nox2apic", setup_nox2apic); | |
186 | #endif | |
1da177e4 | 187 | |
b3c51170 YL |
188 | unsigned long mp_lapic_addr; |
189 | int disable_apic; | |
190 | /* Disable local APIC timer from the kernel commandline or via dmi quirk */ | |
25874a29 | 191 | static int disable_apic_timer __initdata; |
e83a5fdc | 192 | /* Local APIC timer works in C2 */ |
2e7c2838 LT |
193 | int local_apic_timer_c2_ok; |
194 | EXPORT_SYMBOL_GPL(local_apic_timer_c2_ok); | |
195 | ||
efa2559f YL |
196 | int first_system_vector = 0xfe; |
197 | ||
e83a5fdc HS |
198 | /* |
199 | * Debug level, exported for io_apic.c | |
200 | */ | |
baa13188 | 201 | unsigned int apic_verbosity; |
e83a5fdc | 202 | |
89c38c28 CG |
203 | int pic_mode; |
204 | ||
bab4b27c AS |
205 | /* Have we found an MP table */ |
206 | int smp_found_config; | |
207 | ||
39928722 AD |
208 | static struct resource lapic_resource = { |
209 | .name = "Local APIC", | |
210 | .flags = IORESOURCE_MEM | IORESOURCE_BUSY, | |
211 | }; | |
212 | ||
1ade93ef | 213 | unsigned int lapic_timer_frequency = 0; |
d03030e9 | 214 | |
0e078e2f | 215 | static void apic_pm_activate(void); |
ba7eda4c | 216 | |
d3432896 AK |
217 | static unsigned long apic_phys; |
218 | ||
0e078e2f TG |
219 | /* |
220 | * Get the LAPIC version | |
221 | */ | |
222 | static inline int lapic_get_version(void) | |
ba7eda4c | 223 | { |
0e078e2f | 224 | return GET_APIC_VERSION(apic_read(APIC_LVR)); |
ba7eda4c TG |
225 | } |
226 | ||
0e078e2f | 227 | /* |
9c803869 | 228 | * Check, if the APIC is integrated or a separate chip |
0e078e2f TG |
229 | */ |
230 | static inline int lapic_is_integrated(void) | |
ba7eda4c | 231 | { |
9c803869 | 232 | #ifdef CONFIG_X86_64 |
0e078e2f | 233 | return 1; |
9c803869 CG |
234 | #else |
235 | return APIC_INTEGRATED(lapic_get_version()); | |
236 | #endif | |
ba7eda4c TG |
237 | } |
238 | ||
239 | /* | |
0e078e2f | 240 | * Check, whether this is a modern or a first generation APIC |
ba7eda4c | 241 | */ |
0e078e2f | 242 | static int modern_apic(void) |
ba7eda4c | 243 | { |
0e078e2f TG |
244 | /* AMD systems use old APIC versions, so check the CPU */ |
245 | if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD && | |
246 | boot_cpu_data.x86 >= 0xf) | |
247 | return 1; | |
248 | return lapic_get_version() >= 0x14; | |
ba7eda4c TG |
249 | } |
250 | ||
08306ce6 | 251 | /* |
a933c618 CG |
252 | * right after this call apic become NOOP driven |
253 | * so apic->write/read doesn't do anything | |
08306ce6 | 254 | */ |
25874a29 | 255 | static void __init apic_disable(void) |
08306ce6 | 256 | { |
f88f2b4f | 257 | pr_info("APIC: switched to apic NOOP\n"); |
a933c618 | 258 | apic = &apic_noop; |
08306ce6 CG |
259 | } |
260 | ||
c1eeb2de | 261 | void native_apic_wait_icr_idle(void) |
8339e9fb FLV |
262 | { |
263 | while (apic_read(APIC_ICR) & APIC_ICR_BUSY) | |
264 | cpu_relax(); | |
265 | } | |
266 | ||
c1eeb2de | 267 | u32 native_safe_apic_wait_icr_idle(void) |
8339e9fb | 268 | { |
3c6bb07a | 269 | u32 send_status; |
8339e9fb FLV |
270 | int timeout; |
271 | ||
272 | timeout = 0; | |
273 | do { | |
274 | send_status = apic_read(APIC_ICR) & APIC_ICR_BUSY; | |
275 | if (!send_status) | |
276 | break; | |
b49d7d87 | 277 | inc_irq_stat(icr_read_retry_count); |
8339e9fb FLV |
278 | udelay(100); |
279 | } while (timeout++ < 1000); | |
280 | ||
281 | return send_status; | |
282 | } | |
283 | ||
c1eeb2de | 284 | void native_apic_icr_write(u32 low, u32 id) |
1b374e4d | 285 | { |
ed4e5ec1 | 286 | apic_write(APIC_ICR2, SET_APIC_DEST_FIELD(id)); |
1b374e4d SS |
287 | apic_write(APIC_ICR, low); |
288 | } | |
289 | ||
c1eeb2de | 290 | u64 native_apic_icr_read(void) |
1b374e4d SS |
291 | { |
292 | u32 icr1, icr2; | |
293 | ||
294 | icr2 = apic_read(APIC_ICR2); | |
295 | icr1 = apic_read(APIC_ICR); | |
296 | ||
cf9768d7 | 297 | return icr1 | ((u64)icr2 << 32); |
1b374e4d SS |
298 | } |
299 | ||
7c37e48b CG |
300 | #ifdef CONFIG_X86_32 |
301 | /** | |
302 | * get_physical_broadcast - Get number of physical broadcast IDs | |
303 | */ | |
304 | int get_physical_broadcast(void) | |
305 | { | |
306 | return modern_apic() ? 0xff : 0xf; | |
307 | } | |
308 | #endif | |
309 | ||
0e078e2f TG |
310 | /** |
311 | * lapic_get_maxlvt - get the maximum number of local vector table entries | |
312 | */ | |
37e650c7 | 313 | int lapic_get_maxlvt(void) |
1da177e4 | 314 | { |
36a028de | 315 | unsigned int v; |
1da177e4 LT |
316 | |
317 | v = apic_read(APIC_LVR); | |
36a028de CG |
318 | /* |
319 | * - we always have APIC integrated on 64bit mode | |
320 | * - 82489DXs do not report # of LVT entries | |
321 | */ | |
322 | return APIC_INTEGRATED(GET_APIC_VERSION(v)) ? GET_APIC_MAXLVT(v) : 2; | |
1da177e4 LT |
323 | } |
324 | ||
274cfe59 CG |
325 | /* |
326 | * Local APIC timer | |
327 | */ | |
328 | ||
c40aaec6 | 329 | /* Clock divisor */ |
c40aaec6 | 330 | #define APIC_DIVISOR 16 |
279f1461 | 331 | #define TSC_DIVISOR 32 |
f07f4f90 | 332 | |
0e078e2f TG |
333 | /* |
334 | * This function sets up the local APIC timer, with a timeout of | |
335 | * 'clocks' APIC bus clock. During calibration we actually call | |
336 | * this function twice on the boot CPU, once with a bogus timeout | |
337 | * value, second time for real. The other (noncalibrating) CPUs | |
338 | * call this function only once, with the real, calibrated value. | |
339 | * | |
340 | * We do reads before writes even if unnecessary, to get around the | |
341 | * P5 APIC double write bug. | |
342 | */ | |
0e078e2f | 343 | static void __setup_APIC_LVTT(unsigned int clocks, int oneshot, int irqen) |
1da177e4 | 344 | { |
0e078e2f | 345 | unsigned int lvtt_value, tmp_value; |
1da177e4 | 346 | |
0e078e2f TG |
347 | lvtt_value = LOCAL_TIMER_VECTOR; |
348 | if (!oneshot) | |
349 | lvtt_value |= APIC_LVT_TIMER_PERIODIC; | |
279f1461 SS |
350 | else if (boot_cpu_has(X86_FEATURE_TSC_DEADLINE_TIMER)) |
351 | lvtt_value |= APIC_LVT_TIMER_TSCDEADLINE; | |
352 | ||
f07f4f90 CG |
353 | if (!lapic_is_integrated()) |
354 | lvtt_value |= SET_APIC_TIMER_BASE(APIC_TIMER_BASE_DIV); | |
355 | ||
0e078e2f TG |
356 | if (!irqen) |
357 | lvtt_value |= APIC_LVT_MASKED; | |
1da177e4 | 358 | |
0e078e2f | 359 | apic_write(APIC_LVTT, lvtt_value); |
1da177e4 | 360 | |
279f1461 SS |
361 | if (lvtt_value & APIC_LVT_TIMER_TSCDEADLINE) { |
362 | printk_once(KERN_DEBUG "TSC deadline timer enabled\n"); | |
363 | return; | |
364 | } | |
365 | ||
1da177e4 | 366 | /* |
0e078e2f | 367 | * Divide PICLK by 16 |
1da177e4 | 368 | */ |
0e078e2f | 369 | tmp_value = apic_read(APIC_TDCR); |
c40aaec6 CG |
370 | apic_write(APIC_TDCR, |
371 | (tmp_value & ~(APIC_TDR_DIV_1 | APIC_TDR_DIV_TMBASE)) | | |
372 | APIC_TDR_DIV_16); | |
0e078e2f TG |
373 | |
374 | if (!oneshot) | |
f07f4f90 | 375 | apic_write(APIC_TMICT, clocks / APIC_DIVISOR); |
1da177e4 LT |
376 | } |
377 | ||
0e078e2f | 378 | /* |
a68c439b | 379 | * Setup extended LVT, AMD specific |
7b83dae7 | 380 | * |
a68c439b RR |
381 | * Software should use the LVT offsets the BIOS provides. The offsets |
382 | * are determined by the subsystems using it like those for MCE | |
383 | * threshold or IBS. On K8 only offset 0 (APIC500) and MCE interrupts | |
384 | * are supported. Beginning with family 10h at least 4 offsets are | |
385 | * available. | |
286f5718 | 386 | * |
a68c439b RR |
387 | * Since the offsets must be consistent for all cores, we keep track |
388 | * of the LVT offsets in software and reserve the offset for the same | |
389 | * vector also to be used on other cores. An offset is freed by | |
390 | * setting the entry to APIC_EILVT_MASKED. | |
391 | * | |
392 | * If the BIOS is right, there should be no conflicts. Otherwise a | |
393 | * "[Firmware Bug]: ..." error message is generated. However, if | |
394 | * software does not properly determines the offsets, it is not | |
395 | * necessarily a BIOS bug. | |
0e078e2f | 396 | */ |
7b83dae7 | 397 | |
a68c439b RR |
398 | static atomic_t eilvt_offsets[APIC_EILVT_NR_MAX]; |
399 | ||
400 | static inline int eilvt_entry_is_changeable(unsigned int old, unsigned int new) | |
401 | { | |
402 | return (old & APIC_EILVT_MASKED) | |
403 | || (new == APIC_EILVT_MASKED) | |
404 | || ((new & ~APIC_EILVT_MASKED) == old); | |
405 | } | |
406 | ||
407 | static unsigned int reserve_eilvt_offset(int offset, unsigned int new) | |
408 | { | |
8abc3122 | 409 | unsigned int rsvd, vector; |
a68c439b RR |
410 | |
411 | if (offset >= APIC_EILVT_NR_MAX) | |
412 | return ~0; | |
413 | ||
8abc3122 | 414 | rsvd = atomic_read(&eilvt_offsets[offset]); |
a68c439b | 415 | do { |
8abc3122 RR |
416 | vector = rsvd & ~APIC_EILVT_MASKED; /* 0: unassigned */ |
417 | if (vector && !eilvt_entry_is_changeable(vector, new)) | |
a68c439b RR |
418 | /* may not change if vectors are different */ |
419 | return rsvd; | |
420 | rsvd = atomic_cmpxchg(&eilvt_offsets[offset], rsvd, new); | |
421 | } while (rsvd != new); | |
422 | ||
8abc3122 RR |
423 | rsvd &= ~APIC_EILVT_MASKED; |
424 | if (rsvd && rsvd != vector) | |
425 | pr_info("LVT offset %d assigned for vector 0x%02x\n", | |
426 | offset, rsvd); | |
427 | ||
a68c439b RR |
428 | return new; |
429 | } | |
430 | ||
431 | /* | |
432 | * If mask=1, the LVT entry does not generate interrupts while mask=0 | |
cbf74cea RR |
433 | * enables the vector. See also the BKDGs. Must be called with |
434 | * preemption disabled. | |
a68c439b RR |
435 | */ |
436 | ||
27afdf20 | 437 | int setup_APIC_eilvt(u8 offset, u8 vector, u8 msg_type, u8 mask) |
1da177e4 | 438 | { |
a68c439b RR |
439 | unsigned long reg = APIC_EILVTn(offset); |
440 | unsigned int new, old, reserved; | |
441 | ||
442 | new = (mask << 16) | (msg_type << 8) | vector; | |
443 | old = apic_read(reg); | |
444 | reserved = reserve_eilvt_offset(offset, new); | |
445 | ||
446 | if (reserved != new) { | |
eb48c9cb RR |
447 | pr_err(FW_BUG "cpu %d, try to use APIC%lX (LVT offset %d) for " |
448 | "vector 0x%x, but the register is already in use for " | |
449 | "vector 0x%x on another cpu\n", | |
450 | smp_processor_id(), reg, offset, new, reserved); | |
a68c439b RR |
451 | return -EINVAL; |
452 | } | |
453 | ||
454 | if (!eilvt_entry_is_changeable(old, new)) { | |
eb48c9cb RR |
455 | pr_err(FW_BUG "cpu %d, try to use APIC%lX (LVT offset %d) for " |
456 | "vector 0x%x, but the register is already in use for " | |
457 | "vector 0x%x on this cpu\n", | |
458 | smp_processor_id(), reg, offset, new, old); | |
a68c439b RR |
459 | return -EBUSY; |
460 | } | |
461 | ||
462 | apic_write(reg, new); | |
a8fcf1a2 | 463 | |
a68c439b | 464 | return 0; |
1da177e4 | 465 | } |
27afdf20 | 466 | EXPORT_SYMBOL_GPL(setup_APIC_eilvt); |
7b83dae7 | 467 | |
0e078e2f TG |
468 | /* |
469 | * Program the next event, relative to now | |
470 | */ | |
471 | static int lapic_next_event(unsigned long delta, | |
472 | struct clock_event_device *evt) | |
1da177e4 | 473 | { |
0e078e2f TG |
474 | apic_write(APIC_TMICT, delta); |
475 | return 0; | |
1da177e4 LT |
476 | } |
477 | ||
279f1461 SS |
478 | static int lapic_next_deadline(unsigned long delta, |
479 | struct clock_event_device *evt) | |
480 | { | |
481 | u64 tsc; | |
482 | ||
483 | rdtscll(tsc); | |
484 | wrmsrl(MSR_IA32_TSC_DEADLINE, tsc + (((u64) delta) * TSC_DIVISOR)); | |
485 | return 0; | |
486 | } | |
487 | ||
0e078e2f TG |
488 | /* |
489 | * Setup the lapic timer in periodic or oneshot mode | |
490 | */ | |
491 | static void lapic_timer_setup(enum clock_event_mode mode, | |
492 | struct clock_event_device *evt) | |
9b7711f0 HS |
493 | { |
494 | unsigned long flags; | |
0e078e2f | 495 | unsigned int v; |
9b7711f0 | 496 | |
0e078e2f TG |
497 | /* Lapic used as dummy for broadcast ? */ |
498 | if (evt->features & CLOCK_EVT_FEAT_DUMMY) | |
9b7711f0 HS |
499 | return; |
500 | ||
501 | local_irq_save(flags); | |
502 | ||
0e078e2f TG |
503 | switch (mode) { |
504 | case CLOCK_EVT_MODE_PERIODIC: | |
505 | case CLOCK_EVT_MODE_ONESHOT: | |
1ade93ef | 506 | __setup_APIC_LVTT(lapic_timer_frequency, |
0e078e2f TG |
507 | mode != CLOCK_EVT_MODE_PERIODIC, 1); |
508 | break; | |
509 | case CLOCK_EVT_MODE_UNUSED: | |
510 | case CLOCK_EVT_MODE_SHUTDOWN: | |
511 | v = apic_read(APIC_LVTT); | |
512 | v |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR); | |
513 | apic_write(APIC_LVTT, v); | |
6f9b4100 | 514 | apic_write(APIC_TMICT, 0); |
0e078e2f TG |
515 | break; |
516 | case CLOCK_EVT_MODE_RESUME: | |
517 | /* Nothing to do here */ | |
518 | break; | |
519 | } | |
9b7711f0 HS |
520 | |
521 | local_irq_restore(flags); | |
522 | } | |
523 | ||
1da177e4 | 524 | /* |
0e078e2f | 525 | * Local APIC timer broadcast function |
1da177e4 | 526 | */ |
9628937d | 527 | static void lapic_timer_broadcast(const struct cpumask *mask) |
1da177e4 | 528 | { |
0e078e2f | 529 | #ifdef CONFIG_SMP |
dac5f412 | 530 | apic->send_IPI_mask(mask, LOCAL_TIMER_VECTOR); |
0e078e2f TG |
531 | #endif |
532 | } | |
1da177e4 | 533 | |
25874a29 HK |
534 | |
535 | /* | |
536 | * The local apic timer can be used for any function which is CPU local. | |
537 | */ | |
538 | static struct clock_event_device lapic_clockevent = { | |
539 | .name = "lapic", | |
540 | .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT | |
541 | | CLOCK_EVT_FEAT_C3STOP | CLOCK_EVT_FEAT_DUMMY, | |
542 | .shift = 32, | |
543 | .set_mode = lapic_timer_setup, | |
544 | .set_next_event = lapic_next_event, | |
545 | .broadcast = lapic_timer_broadcast, | |
546 | .rating = 100, | |
547 | .irq = -1, | |
548 | }; | |
549 | static DEFINE_PER_CPU(struct clock_event_device, lapic_events); | |
550 | ||
0e078e2f | 551 | /* |
421f91d2 | 552 | * Setup the local APIC timer for this CPU. Copy the initialized values |
0e078e2f TG |
553 | * of the boot CPU and register the clock event in the framework. |
554 | */ | |
148f9bb8 | 555 | static void setup_APIC_timer(void) |
0e078e2f TG |
556 | { |
557 | struct clock_event_device *levt = &__get_cpu_var(lapic_events); | |
1da177e4 | 558 | |
349c004e | 559 | if (this_cpu_has(X86_FEATURE_ARAT)) { |
db954b58 VP |
560 | lapic_clockevent.features &= ~CLOCK_EVT_FEAT_C3STOP; |
561 | /* Make LAPIC timer preferrable over percpu HPET */ | |
562 | lapic_clockevent.rating = 150; | |
563 | } | |
564 | ||
0e078e2f | 565 | memcpy(levt, &lapic_clockevent, sizeof(*levt)); |
320ab2b0 | 566 | levt->cpumask = cpumask_of(smp_processor_id()); |
1da177e4 | 567 | |
279f1461 SS |
568 | if (this_cpu_has(X86_FEATURE_TSC_DEADLINE_TIMER)) { |
569 | levt->features &= ~(CLOCK_EVT_FEAT_PERIODIC | | |
570 | CLOCK_EVT_FEAT_DUMMY); | |
571 | levt->set_next_event = lapic_next_deadline; | |
572 | clockevents_config_and_register(levt, | |
573 | (tsc_khz / TSC_DIVISOR) * 1000, | |
574 | 0xF, ~0UL); | |
575 | } else | |
576 | clockevents_register_device(levt); | |
0e078e2f | 577 | } |
1da177e4 | 578 | |
2f04fa88 YL |
579 | /* |
580 | * In this functions we calibrate APIC bus clocks to the external timer. | |
581 | * | |
582 | * We want to do the calibration only once since we want to have local timer | |
583 | * irqs syncron. CPUs connected by the same APIC bus have the very same bus | |
584 | * frequency. | |
585 | * | |
586 | * This was previously done by reading the PIT/HPET and waiting for a wrap | |
587 | * around to find out, that a tick has elapsed. I have a box, where the PIT | |
588 | * readout is broken, so it never gets out of the wait loop again. This was | |
589 | * also reported by others. | |
590 | * | |
591 | * Monitoring the jiffies value is inaccurate and the clockevents | |
592 | * infrastructure allows us to do a simple substitution of the interrupt | |
593 | * handler. | |
594 | * | |
595 | * The calibration routine also uses the pm_timer when possible, as the PIT | |
596 | * happens to run way too slow (factor 2.3 on my VAIO CoreDuo, which goes | |
597 | * back to normal later in the boot process). | |
598 | */ | |
599 | ||
600 | #define LAPIC_CAL_LOOPS (HZ/10) | |
601 | ||
602 | static __initdata int lapic_cal_loops = -1; | |
603 | static __initdata long lapic_cal_t1, lapic_cal_t2; | |
604 | static __initdata unsigned long long lapic_cal_tsc1, lapic_cal_tsc2; | |
605 | static __initdata unsigned long lapic_cal_pm1, lapic_cal_pm2; | |
606 | static __initdata unsigned long lapic_cal_j1, lapic_cal_j2; | |
607 | ||
608 | /* | |
609 | * Temporary interrupt handler. | |
610 | */ | |
611 | static void __init lapic_cal_handler(struct clock_event_device *dev) | |
612 | { | |
613 | unsigned long long tsc = 0; | |
614 | long tapic = apic_read(APIC_TMCCT); | |
615 | unsigned long pm = acpi_pm_read_early(); | |
616 | ||
617 | if (cpu_has_tsc) | |
618 | rdtscll(tsc); | |
619 | ||
620 | switch (lapic_cal_loops++) { | |
621 | case 0: | |
622 | lapic_cal_t1 = tapic; | |
623 | lapic_cal_tsc1 = tsc; | |
624 | lapic_cal_pm1 = pm; | |
625 | lapic_cal_j1 = jiffies; | |
626 | break; | |
627 | ||
628 | case LAPIC_CAL_LOOPS: | |
629 | lapic_cal_t2 = tapic; | |
630 | lapic_cal_tsc2 = tsc; | |
631 | if (pm < lapic_cal_pm1) | |
632 | pm += ACPI_PM_OVRRUN; | |
633 | lapic_cal_pm2 = pm; | |
634 | lapic_cal_j2 = jiffies; | |
635 | break; | |
636 | } | |
637 | } | |
638 | ||
754ef0cd YI |
639 | static int __init |
640 | calibrate_by_pmtimer(long deltapm, long *delta, long *deltatsc) | |
b189892d CG |
641 | { |
642 | const long pm_100ms = PMTMR_TICKS_PER_SEC / 10; | |
643 | const long pm_thresh = pm_100ms / 100; | |
644 | unsigned long mult; | |
645 | u64 res; | |
646 | ||
647 | #ifndef CONFIG_X86_PM_TIMER | |
648 | return -1; | |
649 | #endif | |
650 | ||
39ba5d43 | 651 | apic_printk(APIC_VERBOSE, "... PM-Timer delta = %ld\n", deltapm); |
b189892d CG |
652 | |
653 | /* Check, if the PM timer is available */ | |
654 | if (!deltapm) | |
655 | return -1; | |
656 | ||
657 | mult = clocksource_hz2mult(PMTMR_TICKS_PER_SEC, 22); | |
658 | ||
659 | if (deltapm > (pm_100ms - pm_thresh) && | |
660 | deltapm < (pm_100ms + pm_thresh)) { | |
39ba5d43 | 661 | apic_printk(APIC_VERBOSE, "... PM-Timer result ok\n"); |
754ef0cd YI |
662 | return 0; |
663 | } | |
664 | ||
665 | res = (((u64)deltapm) * mult) >> 22; | |
666 | do_div(res, 1000000); | |
667 | pr_warning("APIC calibration not consistent " | |
39ba5d43 | 668 | "with PM-Timer: %ldms instead of 100ms\n",(long)res); |
754ef0cd YI |
669 | |
670 | /* Correct the lapic counter value */ | |
671 | res = (((u64)(*delta)) * pm_100ms); | |
672 | do_div(res, deltapm); | |
673 | pr_info("APIC delta adjusted to PM-Timer: " | |
674 | "%lu (%ld)\n", (unsigned long)res, *delta); | |
675 | *delta = (long)res; | |
676 | ||
677 | /* Correct the tsc counter value */ | |
678 | if (cpu_has_tsc) { | |
679 | res = (((u64)(*deltatsc)) * pm_100ms); | |
b189892d | 680 | do_div(res, deltapm); |
754ef0cd | 681 | apic_printk(APIC_VERBOSE, "TSC delta adjusted to " |
3235dc3f | 682 | "PM-Timer: %lu (%ld)\n", |
754ef0cd YI |
683 | (unsigned long)res, *deltatsc); |
684 | *deltatsc = (long)res; | |
b189892d CG |
685 | } |
686 | ||
687 | return 0; | |
688 | } | |
689 | ||
2f04fa88 YL |
690 | static int __init calibrate_APIC_clock(void) |
691 | { | |
692 | struct clock_event_device *levt = &__get_cpu_var(lapic_events); | |
2f04fa88 YL |
693 | void (*real_handler)(struct clock_event_device *dev); |
694 | unsigned long deltaj; | |
754ef0cd | 695 | long delta, deltatsc; |
2f04fa88 YL |
696 | int pm_referenced = 0; |
697 | ||
1ade93ef JP |
698 | /** |
699 | * check if lapic timer has already been calibrated by platform | |
700 | * specific routine, such as tsc calibration code. if so, we just fill | |
701 | * in the clockevent structure and return. | |
702 | */ | |
703 | ||
279f1461 SS |
704 | if (boot_cpu_has(X86_FEATURE_TSC_DEADLINE_TIMER)) { |
705 | return 0; | |
706 | } else if (lapic_timer_frequency) { | |
1ade93ef JP |
707 | apic_printk(APIC_VERBOSE, "lapic timer already calibrated %d\n", |
708 | lapic_timer_frequency); | |
709 | lapic_clockevent.mult = div_sc(lapic_timer_frequency/APIC_DIVISOR, | |
710 | TICK_NSEC, lapic_clockevent.shift); | |
711 | lapic_clockevent.max_delta_ns = | |
712 | clockevent_delta2ns(0x7FFFFF, &lapic_clockevent); | |
713 | lapic_clockevent.min_delta_ns = | |
714 | clockevent_delta2ns(0xF, &lapic_clockevent); | |
715 | lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY; | |
716 | return 0; | |
717 | } | |
718 | ||
279f1461 SS |
719 | apic_printk(APIC_VERBOSE, "Using local APIC timer interrupts.\n" |
720 | "calibrating APIC timer ...\n"); | |
721 | ||
2f04fa88 YL |
722 | local_irq_disable(); |
723 | ||
724 | /* Replace the global interrupt handler */ | |
725 | real_handler = global_clock_event->event_handler; | |
726 | global_clock_event->event_handler = lapic_cal_handler; | |
727 | ||
728 | /* | |
81608f3c | 729 | * Setup the APIC counter to maximum. There is no way the lapic |
2f04fa88 YL |
730 | * can underflow in the 100ms detection time frame |
731 | */ | |
81608f3c | 732 | __setup_APIC_LVTT(0xffffffff, 0, 0); |
2f04fa88 YL |
733 | |
734 | /* Let the interrupts run */ | |
735 | local_irq_enable(); | |
736 | ||
737 | while (lapic_cal_loops <= LAPIC_CAL_LOOPS) | |
738 | cpu_relax(); | |
739 | ||
740 | local_irq_disable(); | |
741 | ||
742 | /* Restore the real event handler */ | |
743 | global_clock_event->event_handler = real_handler; | |
744 | ||
745 | /* Build delta t1-t2 as apic timer counts down */ | |
746 | delta = lapic_cal_t1 - lapic_cal_t2; | |
747 | apic_printk(APIC_VERBOSE, "... lapic delta = %ld\n", delta); | |
748 | ||
754ef0cd YI |
749 | deltatsc = (long)(lapic_cal_tsc2 - lapic_cal_tsc1); |
750 | ||
b189892d CG |
751 | /* we trust the PM based calibration if possible */ |
752 | pm_referenced = !calibrate_by_pmtimer(lapic_cal_pm2 - lapic_cal_pm1, | |
754ef0cd | 753 | &delta, &deltatsc); |
2f04fa88 YL |
754 | |
755 | /* Calculate the scaled math multiplication factor */ | |
756 | lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS, | |
757 | lapic_clockevent.shift); | |
758 | lapic_clockevent.max_delta_ns = | |
4aed89d6 | 759 | clockevent_delta2ns(0x7FFFFFFF, &lapic_clockevent); |
2f04fa88 YL |
760 | lapic_clockevent.min_delta_ns = |
761 | clockevent_delta2ns(0xF, &lapic_clockevent); | |
762 | ||
1ade93ef | 763 | lapic_timer_frequency = (delta * APIC_DIVISOR) / LAPIC_CAL_LOOPS; |
2f04fa88 YL |
764 | |
765 | apic_printk(APIC_VERBOSE, "..... delta %ld\n", delta); | |
411462f6 | 766 | apic_printk(APIC_VERBOSE, "..... mult: %u\n", lapic_clockevent.mult); |
2f04fa88 | 767 | apic_printk(APIC_VERBOSE, "..... calibration result: %u\n", |
1ade93ef | 768 | lapic_timer_frequency); |
2f04fa88 YL |
769 | |
770 | if (cpu_has_tsc) { | |
2f04fa88 YL |
771 | apic_printk(APIC_VERBOSE, "..... CPU clock speed is " |
772 | "%ld.%04ld MHz.\n", | |
754ef0cd YI |
773 | (deltatsc / LAPIC_CAL_LOOPS) / (1000000 / HZ), |
774 | (deltatsc / LAPIC_CAL_LOOPS) % (1000000 / HZ)); | |
2f04fa88 YL |
775 | } |
776 | ||
777 | apic_printk(APIC_VERBOSE, "..... host bus clock speed is " | |
778 | "%u.%04u MHz.\n", | |
1ade93ef JP |
779 | lapic_timer_frequency / (1000000 / HZ), |
780 | lapic_timer_frequency % (1000000 / HZ)); | |
2f04fa88 YL |
781 | |
782 | /* | |
783 | * Do a sanity check on the APIC calibration result | |
784 | */ | |
1ade93ef | 785 | if (lapic_timer_frequency < (1000000 / HZ)) { |
2f04fa88 | 786 | local_irq_enable(); |
ba21ebb6 | 787 | pr_warning("APIC frequency too slow, disabling apic timer\n"); |
2f04fa88 YL |
788 | return -1; |
789 | } | |
790 | ||
791 | levt->features &= ~CLOCK_EVT_FEAT_DUMMY; | |
792 | ||
b189892d CG |
793 | /* |
794 | * PM timer calibration failed or not turned on | |
795 | * so lets try APIC timer based calibration | |
796 | */ | |
2f04fa88 YL |
797 | if (!pm_referenced) { |
798 | apic_printk(APIC_VERBOSE, "... verify APIC timer\n"); | |
799 | ||
800 | /* | |
801 | * Setup the apic timer manually | |
802 | */ | |
803 | levt->event_handler = lapic_cal_handler; | |
804 | lapic_timer_setup(CLOCK_EVT_MODE_PERIODIC, levt); | |
805 | lapic_cal_loops = -1; | |
806 | ||
807 | /* Let the interrupts run */ | |
808 | local_irq_enable(); | |
809 | ||
810 | while (lapic_cal_loops <= LAPIC_CAL_LOOPS) | |
811 | cpu_relax(); | |
812 | ||
2f04fa88 YL |
813 | /* Stop the lapic timer */ |
814 | lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, levt); | |
815 | ||
2f04fa88 YL |
816 | /* Jiffies delta */ |
817 | deltaj = lapic_cal_j2 - lapic_cal_j1; | |
818 | apic_printk(APIC_VERBOSE, "... jiffies delta = %lu\n", deltaj); | |
819 | ||
820 | /* Check, if the jiffies result is consistent */ | |
821 | if (deltaj >= LAPIC_CAL_LOOPS-2 && deltaj <= LAPIC_CAL_LOOPS+2) | |
822 | apic_printk(APIC_VERBOSE, "... jiffies result ok\n"); | |
823 | else | |
824 | levt->features |= CLOCK_EVT_FEAT_DUMMY; | |
825 | } else | |
826 | local_irq_enable(); | |
827 | ||
828 | if (levt->features & CLOCK_EVT_FEAT_DUMMY) { | |
e423e33e | 829 | pr_warning("APIC timer disabled due to verification failure\n"); |
2f04fa88 YL |
830 | return -1; |
831 | } | |
832 | ||
833 | return 0; | |
834 | } | |
835 | ||
e83a5fdc HS |
836 | /* |
837 | * Setup the boot APIC | |
838 | * | |
839 | * Calibrate and verify the result. | |
840 | */ | |
0e078e2f TG |
841 | void __init setup_boot_APIC_clock(void) |
842 | { | |
843 | /* | |
274cfe59 CG |
844 | * The local apic timer can be disabled via the kernel |
845 | * commandline or from the CPU detection code. Register the lapic | |
846 | * timer as a dummy clock event source on SMP systems, so the | |
847 | * broadcast mechanism is used. On UP systems simply ignore it. | |
0e078e2f TG |
848 | */ |
849 | if (disable_apic_timer) { | |
ba21ebb6 | 850 | pr_info("Disabling APIC timer\n"); |
0e078e2f | 851 | /* No broadcast on UP ! */ |
9d09951d TG |
852 | if (num_possible_cpus() > 1) { |
853 | lapic_clockevent.mult = 1; | |
0e078e2f | 854 | setup_APIC_timer(); |
9d09951d | 855 | } |
0e078e2f TG |
856 | return; |
857 | } | |
858 | ||
89b3b1f4 | 859 | if (calibrate_APIC_clock()) { |
c2b84b30 TG |
860 | /* No broadcast on UP ! */ |
861 | if (num_possible_cpus() > 1) | |
862 | setup_APIC_timer(); | |
863 | return; | |
864 | } | |
865 | ||
0e078e2f TG |
866 | /* |
867 | * If nmi_watchdog is set to IO_APIC, we need the | |
868 | * PIT/HPET going. Otherwise register lapic as a dummy | |
869 | * device. | |
870 | */ | |
072b198a | 871 | lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY; |
0e078e2f | 872 | |
274cfe59 | 873 | /* Setup the lapic or request the broadcast */ |
0e078e2f TG |
874 | setup_APIC_timer(); |
875 | } | |
876 | ||
148f9bb8 | 877 | void setup_secondary_APIC_clock(void) |
0e078e2f | 878 | { |
0e078e2f TG |
879 | setup_APIC_timer(); |
880 | } | |
881 | ||
882 | /* | |
883 | * The guts of the apic timer interrupt | |
884 | */ | |
885 | static void local_apic_timer_interrupt(void) | |
886 | { | |
887 | int cpu = smp_processor_id(); | |
888 | struct clock_event_device *evt = &per_cpu(lapic_events, cpu); | |
889 | ||
890 | /* | |
891 | * Normally we should not be here till LAPIC has been initialized but | |
892 | * in some cases like kdump, its possible that there is a pending LAPIC | |
893 | * timer interrupt from previous kernel's context and is delivered in | |
894 | * new kernel the moment interrupts are enabled. | |
895 | * | |
896 | * Interrupts are enabled early and LAPIC is setup much later, hence | |
897 | * its possible that when we get here evt->event_handler is NULL. | |
898 | * Check for event_handler being NULL and discard the interrupt as | |
899 | * spurious. | |
900 | */ | |
901 | if (!evt->event_handler) { | |
ba21ebb6 | 902 | pr_warning("Spurious LAPIC timer interrupt on cpu %d\n", cpu); |
0e078e2f TG |
903 | /* Switch it off */ |
904 | lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, evt); | |
905 | return; | |
906 | } | |
907 | ||
908 | /* | |
909 | * the NMI deadlock-detector uses this. | |
910 | */ | |
915b0d01 | 911 | inc_irq_stat(apic_timer_irqs); |
0e078e2f TG |
912 | |
913 | evt->event_handler(evt); | |
914 | } | |
915 | ||
916 | /* | |
917 | * Local APIC timer interrupt. This is the most natural way for doing | |
918 | * local interrupts, but local timer interrupts can be emulated by | |
919 | * broadcast interrupts too. [in case the hw doesn't support APIC timers] | |
920 | * | |
921 | * [ if a single-CPU system runs an SMP kernel then we call the local | |
922 | * interrupt as well. Thus we cannot inline the local irq ... ] | |
923 | */ | |
1d9090e2 | 924 | __visible void __irq_entry smp_apic_timer_interrupt(struct pt_regs *regs) |
0e078e2f TG |
925 | { |
926 | struct pt_regs *old_regs = set_irq_regs(regs); | |
927 | ||
928 | /* | |
929 | * NOTE! We'd better ACK the irq immediately, | |
930 | * because timer handling can be slow. | |
eddc0e92 | 931 | * |
0e078e2f TG |
932 | * update_process_times() expects us to have done irq_enter(). |
933 | * Besides, if we don't timer interrupts ignore the global | |
934 | * interrupt lock, which is the WrongThing (tm) to do. | |
0e078e2f | 935 | */ |
eddc0e92 | 936 | entering_ack_irq(); |
0e078e2f | 937 | local_apic_timer_interrupt(); |
eddc0e92 | 938 | exiting_irq(); |
274cfe59 | 939 | |
0e078e2f TG |
940 | set_irq_regs(old_regs); |
941 | } | |
942 | ||
1d9090e2 | 943 | __visible void __irq_entry smp_trace_apic_timer_interrupt(struct pt_regs *regs) |
cf910e83 SA |
944 | { |
945 | struct pt_regs *old_regs = set_irq_regs(regs); | |
946 | ||
0e078e2f | 947 | /* |
cf910e83 SA |
948 | * NOTE! We'd better ACK the irq immediately, |
949 | * because timer handling can be slow. | |
950 | * | |
0e078e2f TG |
951 | * update_process_times() expects us to have done irq_enter(). |
952 | * Besides, if we don't timer interrupts ignore the global | |
953 | * interrupt lock, which is the WrongThing (tm) to do. | |
954 | */ | |
cf910e83 SA |
955 | entering_ack_irq(); |
956 | trace_local_timer_entry(LOCAL_TIMER_VECTOR); | |
0e078e2f | 957 | local_apic_timer_interrupt(); |
cf910e83 SA |
958 | trace_local_timer_exit(LOCAL_TIMER_VECTOR); |
959 | exiting_irq(); | |
274cfe59 | 960 | |
0e078e2f TG |
961 | set_irq_regs(old_regs); |
962 | } | |
963 | ||
964 | int setup_profiling_timer(unsigned int multiplier) | |
965 | { | |
966 | return -EINVAL; | |
967 | } | |
968 | ||
0e078e2f TG |
969 | /* |
970 | * Local APIC start and shutdown | |
971 | */ | |
972 | ||
973 | /** | |
974 | * clear_local_APIC - shutdown the local APIC | |
975 | * | |
976 | * This is called, when a CPU is disabled and before rebooting, so the state of | |
977 | * the local APIC has no dangling leftovers. Also used to cleanout any BIOS | |
978 | * leftovers during boot. | |
979 | */ | |
980 | void clear_local_APIC(void) | |
981 | { | |
2584a82d | 982 | int maxlvt; |
0e078e2f TG |
983 | u32 v; |
984 | ||
d3432896 | 985 | /* APIC hasn't been mapped yet */ |
fc1edaf9 | 986 | if (!x2apic_mode && !apic_phys) |
d3432896 AK |
987 | return; |
988 | ||
989 | maxlvt = lapic_get_maxlvt(); | |
0e078e2f TG |
990 | /* |
991 | * Masking an LVT entry can trigger a local APIC error | |
992 | * if the vector is zero. Mask LVTERR first to prevent this. | |
993 | */ | |
994 | if (maxlvt >= 3) { | |
995 | v = ERROR_APIC_VECTOR; /* any non-zero vector will do */ | |
996 | apic_write(APIC_LVTERR, v | APIC_LVT_MASKED); | |
997 | } | |
998 | /* | |
999 | * Careful: we have to set masks only first to deassert | |
1000 | * any level-triggered sources. | |
1001 | */ | |
1002 | v = apic_read(APIC_LVTT); | |
1003 | apic_write(APIC_LVTT, v | APIC_LVT_MASKED); | |
1004 | v = apic_read(APIC_LVT0); | |
1005 | apic_write(APIC_LVT0, v | APIC_LVT_MASKED); | |
1006 | v = apic_read(APIC_LVT1); | |
1007 | apic_write(APIC_LVT1, v | APIC_LVT_MASKED); | |
1008 | if (maxlvt >= 4) { | |
1009 | v = apic_read(APIC_LVTPC); | |
1010 | apic_write(APIC_LVTPC, v | APIC_LVT_MASKED); | |
1011 | } | |
1012 | ||
6764014b | 1013 | /* lets not touch this if we didn't frob it */ |
4efc0670 | 1014 | #ifdef CONFIG_X86_THERMAL_VECTOR |
6764014b CG |
1015 | if (maxlvt >= 5) { |
1016 | v = apic_read(APIC_LVTTHMR); | |
1017 | apic_write(APIC_LVTTHMR, v | APIC_LVT_MASKED); | |
1018 | } | |
1019 | #endif | |
5ca8681c AK |
1020 | #ifdef CONFIG_X86_MCE_INTEL |
1021 | if (maxlvt >= 6) { | |
1022 | v = apic_read(APIC_LVTCMCI); | |
1023 | if (!(v & APIC_LVT_MASKED)) | |
1024 | apic_write(APIC_LVTCMCI, v | APIC_LVT_MASKED); | |
1025 | } | |
1026 | #endif | |
1027 | ||
0e078e2f TG |
1028 | /* |
1029 | * Clean APIC state for other OSs: | |
1030 | */ | |
1031 | apic_write(APIC_LVTT, APIC_LVT_MASKED); | |
1032 | apic_write(APIC_LVT0, APIC_LVT_MASKED); | |
1033 | apic_write(APIC_LVT1, APIC_LVT_MASKED); | |
1034 | if (maxlvt >= 3) | |
1035 | apic_write(APIC_LVTERR, APIC_LVT_MASKED); | |
1036 | if (maxlvt >= 4) | |
1037 | apic_write(APIC_LVTPC, APIC_LVT_MASKED); | |
6764014b CG |
1038 | |
1039 | /* Integrated APIC (!82489DX) ? */ | |
1040 | if (lapic_is_integrated()) { | |
1041 | if (maxlvt > 3) | |
1042 | /* Clear ESR due to Pentium errata 3AP and 11AP */ | |
1043 | apic_write(APIC_ESR, 0); | |
1044 | apic_read(APIC_ESR); | |
1045 | } | |
0e078e2f TG |
1046 | } |
1047 | ||
1048 | /** | |
1049 | * disable_local_APIC - clear and disable the local APIC | |
1050 | */ | |
1051 | void disable_local_APIC(void) | |
1052 | { | |
1053 | unsigned int value; | |
1054 | ||
4a13ad0b | 1055 | /* APIC hasn't been mapped yet */ |
fd19dce7 | 1056 | if (!x2apic_mode && !apic_phys) |
4a13ad0b JB |
1057 | return; |
1058 | ||
0e078e2f TG |
1059 | clear_local_APIC(); |
1060 | ||
1061 | /* | |
1062 | * Disable APIC (implies clearing of registers | |
1063 | * for 82489DX!). | |
1064 | */ | |
1065 | value = apic_read(APIC_SPIV); | |
1066 | value &= ~APIC_SPIV_APIC_ENABLED; | |
1067 | apic_write(APIC_SPIV, value); | |
990b183e CG |
1068 | |
1069 | #ifdef CONFIG_X86_32 | |
1070 | /* | |
1071 | * When LAPIC was disabled by the BIOS and enabled by the kernel, | |
1072 | * restore the disabled state. | |
1073 | */ | |
1074 | if (enabled_via_apicbase) { | |
1075 | unsigned int l, h; | |
1076 | ||
1077 | rdmsr(MSR_IA32_APICBASE, l, h); | |
1078 | l &= ~MSR_IA32_APICBASE_ENABLE; | |
1079 | wrmsr(MSR_IA32_APICBASE, l, h); | |
1080 | } | |
1081 | #endif | |
0e078e2f TG |
1082 | } |
1083 | ||
fe4024dc CG |
1084 | /* |
1085 | * If Linux enabled the LAPIC against the BIOS default disable it down before | |
1086 | * re-entering the BIOS on shutdown. Otherwise the BIOS may get confused and | |
1087 | * not power-off. Additionally clear all LVT entries before disable_local_APIC | |
1088 | * for the case where Linux didn't enable the LAPIC. | |
1089 | */ | |
0e078e2f TG |
1090 | void lapic_shutdown(void) |
1091 | { | |
1092 | unsigned long flags; | |
1093 | ||
8312136f | 1094 | if (!cpu_has_apic && !apic_from_smp_config()) |
0e078e2f TG |
1095 | return; |
1096 | ||
1097 | local_irq_save(flags); | |
1098 | ||
fe4024dc CG |
1099 | #ifdef CONFIG_X86_32 |
1100 | if (!enabled_via_apicbase) | |
1101 | clear_local_APIC(); | |
1102 | else | |
1103 | #endif | |
1104 | disable_local_APIC(); | |
1105 | ||
0e078e2f TG |
1106 | |
1107 | local_irq_restore(flags); | |
1108 | } | |
1109 | ||
1110 | /* | |
1111 | * This is to verify that we're looking at a real local APIC. | |
1112 | * Check these against your board if the CPUs aren't getting | |
1113 | * started for no apparent reason. | |
1114 | */ | |
1115 | int __init verify_local_APIC(void) | |
1116 | { | |
1117 | unsigned int reg0, reg1; | |
1118 | ||
1119 | /* | |
1120 | * The version register is read-only in a real APIC. | |
1121 | */ | |
1122 | reg0 = apic_read(APIC_LVR); | |
1123 | apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg0); | |
1124 | apic_write(APIC_LVR, reg0 ^ APIC_LVR_MASK); | |
1125 | reg1 = apic_read(APIC_LVR); | |
1126 | apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg1); | |
1127 | ||
1128 | /* | |
1129 | * The two version reads above should print the same | |
1130 | * numbers. If the second one is different, then we | |
1131 | * poke at a non-APIC. | |
1132 | */ | |
1133 | if (reg1 != reg0) | |
1134 | return 0; | |
1135 | ||
1136 | /* | |
1137 | * Check if the version looks reasonably. | |
1138 | */ | |
1139 | reg1 = GET_APIC_VERSION(reg0); | |
1140 | if (reg1 == 0x00 || reg1 == 0xff) | |
1141 | return 0; | |
1142 | reg1 = lapic_get_maxlvt(); | |
1143 | if (reg1 < 0x02 || reg1 == 0xff) | |
1144 | return 0; | |
1145 | ||
1146 | /* | |
1147 | * The ID register is read/write in a real APIC. | |
1148 | */ | |
2d7a66d0 | 1149 | reg0 = apic_read(APIC_ID); |
0e078e2f | 1150 | apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg0); |
5b812727 | 1151 | apic_write(APIC_ID, reg0 ^ apic->apic_id_mask); |
2d7a66d0 | 1152 | reg1 = apic_read(APIC_ID); |
0e078e2f TG |
1153 | apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg1); |
1154 | apic_write(APIC_ID, reg0); | |
5b812727 | 1155 | if (reg1 != (reg0 ^ apic->apic_id_mask)) |
0e078e2f TG |
1156 | return 0; |
1157 | ||
1158 | /* | |
1da177e4 LT |
1159 | * The next two are just to see if we have sane values. |
1160 | * They're only really relevant if we're in Virtual Wire | |
1161 | * compatibility mode, but most boxes are anymore. | |
1162 | */ | |
1163 | reg0 = apic_read(APIC_LVT0); | |
0e078e2f | 1164 | apic_printk(APIC_DEBUG, "Getting LVT0: %x\n", reg0); |
1da177e4 LT |
1165 | reg1 = apic_read(APIC_LVT1); |
1166 | apic_printk(APIC_DEBUG, "Getting LVT1: %x\n", reg1); | |
1167 | ||
1168 | return 1; | |
1169 | } | |
1170 | ||
0e078e2f TG |
1171 | /** |
1172 | * sync_Arb_IDs - synchronize APIC bus arbitration IDs | |
1173 | */ | |
1da177e4 LT |
1174 | void __init sync_Arb_IDs(void) |
1175 | { | |
296cb951 CG |
1176 | /* |
1177 | * Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 And not | |
1178 | * needed on AMD. | |
1179 | */ | |
1180 | if (modern_apic() || boot_cpu_data.x86_vendor == X86_VENDOR_AMD) | |
1da177e4 LT |
1181 | return; |
1182 | ||
1183 | /* | |
1184 | * Wait for idle. | |
1185 | */ | |
1186 | apic_wait_icr_idle(); | |
1187 | ||
1188 | apic_printk(APIC_DEBUG, "Synchronizing Arb IDs.\n"); | |
6f6da97f CG |
1189 | apic_write(APIC_ICR, APIC_DEST_ALLINC | |
1190 | APIC_INT_LEVELTRIG | APIC_DM_INIT); | |
1da177e4 LT |
1191 | } |
1192 | ||
1da177e4 LT |
1193 | /* |
1194 | * An initial setup of the virtual wire mode. | |
1195 | */ | |
1196 | void __init init_bsp_APIC(void) | |
1197 | { | |
11a8e778 | 1198 | unsigned int value; |
1da177e4 LT |
1199 | |
1200 | /* | |
1201 | * Don't do the setup now if we have a SMP BIOS as the | |
1202 | * through-I/O-APIC virtual wire mode might be active. | |
1203 | */ | |
1204 | if (smp_found_config || !cpu_has_apic) | |
1205 | return; | |
1206 | ||
1da177e4 LT |
1207 | /* |
1208 | * Do not trust the local APIC being empty at bootup. | |
1209 | */ | |
1210 | clear_local_APIC(); | |
1211 | ||
1212 | /* | |
1213 | * Enable APIC. | |
1214 | */ | |
1215 | value = apic_read(APIC_SPIV); | |
1216 | value &= ~APIC_VECTOR_MASK; | |
1217 | value |= APIC_SPIV_APIC_ENABLED; | |
638c0411 CG |
1218 | |
1219 | #ifdef CONFIG_X86_32 | |
1220 | /* This bit is reserved on P4/Xeon and should be cleared */ | |
1221 | if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) && | |
1222 | (boot_cpu_data.x86 == 15)) | |
1223 | value &= ~APIC_SPIV_FOCUS_DISABLED; | |
1224 | else | |
1225 | #endif | |
1226 | value |= APIC_SPIV_FOCUS_DISABLED; | |
1da177e4 | 1227 | value |= SPURIOUS_APIC_VECTOR; |
11a8e778 | 1228 | apic_write(APIC_SPIV, value); |
1da177e4 LT |
1229 | |
1230 | /* | |
1231 | * Set up the virtual wire mode. | |
1232 | */ | |
11a8e778 | 1233 | apic_write(APIC_LVT0, APIC_DM_EXTINT); |
1da177e4 | 1234 | value = APIC_DM_NMI; |
638c0411 CG |
1235 | if (!lapic_is_integrated()) /* 82489DX */ |
1236 | value |= APIC_LVT_LEVEL_TRIGGER; | |
11a8e778 | 1237 | apic_write(APIC_LVT1, value); |
1da177e4 LT |
1238 | } |
1239 | ||
148f9bb8 | 1240 | static void lapic_setup_esr(void) |
c43da2f5 | 1241 | { |
9df08f10 CG |
1242 | unsigned int oldvalue, value, maxlvt; |
1243 | ||
1244 | if (!lapic_is_integrated()) { | |
ba21ebb6 | 1245 | pr_info("No ESR for 82489DX.\n"); |
9df08f10 CG |
1246 | return; |
1247 | } | |
c43da2f5 | 1248 | |
08125d3e | 1249 | if (apic->disable_esr) { |
c43da2f5 | 1250 | /* |
9df08f10 CG |
1251 | * Something untraceable is creating bad interrupts on |
1252 | * secondary quads ... for the moment, just leave the | |
1253 | * ESR disabled - we can't do anything useful with the | |
1254 | * errors anyway - mbligh | |
c43da2f5 | 1255 | */ |
ba21ebb6 | 1256 | pr_info("Leaving ESR disabled.\n"); |
9df08f10 | 1257 | return; |
c43da2f5 | 1258 | } |
9df08f10 CG |
1259 | |
1260 | maxlvt = lapic_get_maxlvt(); | |
1261 | if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */ | |
1262 | apic_write(APIC_ESR, 0); | |
1263 | oldvalue = apic_read(APIC_ESR); | |
1264 | ||
1265 | /* enables sending errors */ | |
1266 | value = ERROR_APIC_VECTOR; | |
1267 | apic_write(APIC_LVTERR, value); | |
1268 | ||
1269 | /* | |
1270 | * spec says clear errors after enabling vector. | |
1271 | */ | |
1272 | if (maxlvt > 3) | |
1273 | apic_write(APIC_ESR, 0); | |
1274 | value = apic_read(APIC_ESR); | |
1275 | if (value != oldvalue) | |
1276 | apic_printk(APIC_VERBOSE, "ESR value before enabling " | |
1277 | "vector: 0x%08x after: 0x%08x\n", | |
1278 | oldvalue, value); | |
c43da2f5 CG |
1279 | } |
1280 | ||
0e078e2f TG |
1281 | /** |
1282 | * setup_local_APIC - setup the local APIC | |
0aa002fe TH |
1283 | * |
1284 | * Used to setup local APIC while initializing BSP or bringin up APs. | |
1285 | * Always called with preemption disabled. | |
0e078e2f | 1286 | */ |
148f9bb8 | 1287 | void setup_local_APIC(void) |
1da177e4 | 1288 | { |
0aa002fe | 1289 | int cpu = smp_processor_id(); |
8c3ba8d0 KJ |
1290 | unsigned int value, queued; |
1291 | int i, j, acked = 0; | |
1292 | unsigned long long tsc = 0, ntsc; | |
1293 | long long max_loops = cpu_khz; | |
1294 | ||
1295 | if (cpu_has_tsc) | |
1296 | rdtscll(tsc); | |
1da177e4 | 1297 | |
f1182638 | 1298 | if (disable_apic) { |
7167d08e | 1299 | disable_ioapic_support(); |
f1182638 JB |
1300 | return; |
1301 | } | |
1302 | ||
89c38c28 CG |
1303 | #ifdef CONFIG_X86_32 |
1304 | /* Pound the ESR really hard over the head with a big hammer - mbligh */ | |
08125d3e | 1305 | if (lapic_is_integrated() && apic->disable_esr) { |
89c38c28 CG |
1306 | apic_write(APIC_ESR, 0); |
1307 | apic_write(APIC_ESR, 0); | |
1308 | apic_write(APIC_ESR, 0); | |
1309 | apic_write(APIC_ESR, 0); | |
1310 | } | |
1311 | #endif | |
cdd6c482 | 1312 | perf_events_lapic_init(); |
89c38c28 | 1313 | |
1da177e4 LT |
1314 | /* |
1315 | * Double-check whether this APIC is really registered. | |
1316 | * This is meaningless in clustered apic mode, so we skip it. | |
1317 | */ | |
c2777f98 | 1318 | BUG_ON(!apic->apic_id_registered()); |
1da177e4 LT |
1319 | |
1320 | /* | |
1321 | * Intel recommends to set DFR, LDR and TPR before enabling | |
1322 | * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel | |
1323 | * document number 292116). So here it goes... | |
1324 | */ | |
a5c43296 | 1325 | apic->init_apic_ldr(); |
1da177e4 | 1326 | |
6f802c4b TH |
1327 | #ifdef CONFIG_X86_32 |
1328 | /* | |
acb8bc09 TH |
1329 | * APIC LDR is initialized. If logical_apicid mapping was |
1330 | * initialized during get_smp_config(), make sure it matches the | |
1331 | * actual value. | |
6f802c4b | 1332 | */ |
acb8bc09 TH |
1333 | i = early_per_cpu(x86_cpu_to_logical_apicid, cpu); |
1334 | WARN_ON(i != BAD_APICID && i != logical_smp_processor_id()); | |
1335 | /* always use the value from LDR */ | |
6f802c4b TH |
1336 | early_per_cpu(x86_cpu_to_logical_apicid, cpu) = |
1337 | logical_smp_processor_id(); | |
c4b90c11 TH |
1338 | |
1339 | /* | |
1340 | * Some NUMA implementations (NUMAQ) don't initialize apicid to | |
1341 | * node mapping during NUMA init. Now that logical apicid is | |
1342 | * guaranteed to be known, give it another chance. This is already | |
1343 | * a bit too late - percpu allocation has already happened without | |
1344 | * proper NUMA affinity. | |
1345 | */ | |
84914ed0 TH |
1346 | if (apic->x86_32_numa_cpu_node) |
1347 | set_apicid_to_node(early_per_cpu(x86_cpu_to_apicid, cpu), | |
1348 | apic->x86_32_numa_cpu_node(cpu)); | |
6f802c4b TH |
1349 | #endif |
1350 | ||
1da177e4 LT |
1351 | /* |
1352 | * Set Task Priority to 'accept all'. We never change this | |
1353 | * later on. | |
1354 | */ | |
1355 | value = apic_read(APIC_TASKPRI); | |
1356 | value &= ~APIC_TPRI_MASK; | |
11a8e778 | 1357 | apic_write(APIC_TASKPRI, value); |
1da177e4 | 1358 | |
da7ed9f9 VG |
1359 | /* |
1360 | * After a crash, we no longer service the interrupts and a pending | |
1361 | * interrupt from previous kernel might still have ISR bit set. | |
1362 | * | |
1363 | * Most probably by now CPU has serviced that pending interrupt and | |
1364 | * it might not have done the ack_APIC_irq() because it thought, | |
1365 | * interrupt came from i8259 as ExtInt. LAPIC did not get EOI so it | |
1366 | * does not clear the ISR bit and cpu thinks it has already serivced | |
1367 | * the interrupt. Hence a vector might get locked. It was noticed | |
1368 | * for timer irq (vector 0x31). Issue an extra EOI to clear ISR. | |
1369 | */ | |
8c3ba8d0 KJ |
1370 | do { |
1371 | queued = 0; | |
1372 | for (i = APIC_ISR_NR - 1; i >= 0; i--) | |
1373 | queued |= apic_read(APIC_IRR + i*0x10); | |
1374 | ||
1375 | for (i = APIC_ISR_NR - 1; i >= 0; i--) { | |
1376 | value = apic_read(APIC_ISR + i*0x10); | |
1377 | for (j = 31; j >= 0; j--) { | |
1378 | if (value & (1<<j)) { | |
1379 | ack_APIC_irq(); | |
1380 | acked++; | |
1381 | } | |
1382 | } | |
da7ed9f9 | 1383 | } |
8c3ba8d0 KJ |
1384 | if (acked > 256) { |
1385 | printk(KERN_ERR "LAPIC pending interrupts after %d EOI\n", | |
1386 | acked); | |
1387 | break; | |
1388 | } | |
42fa4250 SF |
1389 | if (queued) { |
1390 | if (cpu_has_tsc) { | |
1391 | rdtscll(ntsc); | |
1392 | max_loops = (cpu_khz << 10) - (ntsc - tsc); | |
1393 | } else | |
1394 | max_loops--; | |
1395 | } | |
8c3ba8d0 KJ |
1396 | } while (queued && max_loops > 0); |
1397 | WARN_ON(max_loops <= 0); | |
da7ed9f9 | 1398 | |
1da177e4 LT |
1399 | /* |
1400 | * Now that we are all set up, enable the APIC | |
1401 | */ | |
1402 | value = apic_read(APIC_SPIV); | |
1403 | value &= ~APIC_VECTOR_MASK; | |
1404 | /* | |
1405 | * Enable APIC | |
1406 | */ | |
1407 | value |= APIC_SPIV_APIC_ENABLED; | |
1408 | ||
89c38c28 CG |
1409 | #ifdef CONFIG_X86_32 |
1410 | /* | |
1411 | * Some unknown Intel IO/APIC (or APIC) errata is biting us with | |
1412 | * certain networking cards. If high frequency interrupts are | |
1413 | * happening on a particular IOAPIC pin, plus the IOAPIC routing | |
1414 | * entry is masked/unmasked at a high rate as well then sooner or | |
1415 | * later IOAPIC line gets 'stuck', no more interrupts are received | |
1416 | * from the device. If focus CPU is disabled then the hang goes | |
1417 | * away, oh well :-( | |
1418 | * | |
1419 | * [ This bug can be reproduced easily with a level-triggered | |
1420 | * PCI Ne2000 networking cards and PII/PIII processors, dual | |
1421 | * BX chipset. ] | |
1422 | */ | |
1423 | /* | |
1424 | * Actually disabling the focus CPU check just makes the hang less | |
1425 | * frequent as it makes the interrupt distributon model be more | |
1426 | * like LRU than MRU (the short-term load is more even across CPUs). | |
1427 | * See also the comment in end_level_ioapic_irq(). --macro | |
1428 | */ | |
1429 | ||
1430 | /* | |
1431 | * - enable focus processor (bit==0) | |
1432 | * - 64bit mode always use processor focus | |
1433 | * so no need to set it | |
1434 | */ | |
1435 | value &= ~APIC_SPIV_FOCUS_DISABLED; | |
1436 | #endif | |
3f14c746 | 1437 | |
1da177e4 LT |
1438 | /* |
1439 | * Set spurious IRQ vector | |
1440 | */ | |
1441 | value |= SPURIOUS_APIC_VECTOR; | |
11a8e778 | 1442 | apic_write(APIC_SPIV, value); |
1da177e4 LT |
1443 | |
1444 | /* | |
1445 | * Set up LVT0, LVT1: | |
1446 | * | |
1447 | * set up through-local-APIC on the BP's LINT0. This is not | |
1448 | * strictly necessary in pure symmetric-IO mode, but sometimes | |
1449 | * we delegate interrupts to the 8259A. | |
1450 | */ | |
1451 | /* | |
1452 | * TODO: set up through-local-APIC from through-I/O-APIC? --macro | |
1453 | */ | |
1454 | value = apic_read(APIC_LVT0) & APIC_LVT_MASKED; | |
0aa002fe | 1455 | if (!cpu && (pic_mode || !value)) { |
1da177e4 | 1456 | value = APIC_DM_EXTINT; |
0aa002fe | 1457 | apic_printk(APIC_VERBOSE, "enabled ExtINT on CPU#%d\n", cpu); |
1da177e4 LT |
1458 | } else { |
1459 | value = APIC_DM_EXTINT | APIC_LVT_MASKED; | |
0aa002fe | 1460 | apic_printk(APIC_VERBOSE, "masked ExtINT on CPU#%d\n", cpu); |
1da177e4 | 1461 | } |
11a8e778 | 1462 | apic_write(APIC_LVT0, value); |
1da177e4 LT |
1463 | |
1464 | /* | |
1465 | * only the BP should see the LINT1 NMI signal, obviously. | |
1466 | */ | |
0aa002fe | 1467 | if (!cpu) |
1da177e4 LT |
1468 | value = APIC_DM_NMI; |
1469 | else | |
1470 | value = APIC_DM_NMI | APIC_LVT_MASKED; | |
89c38c28 CG |
1471 | if (!lapic_is_integrated()) /* 82489DX */ |
1472 | value |= APIC_LVT_LEVEL_TRIGGER; | |
11a8e778 | 1473 | apic_write(APIC_LVT1, value); |
89c38c28 | 1474 | |
be71b855 AK |
1475 | #ifdef CONFIG_X86_MCE_INTEL |
1476 | /* Recheck CMCI information after local APIC is up on CPU #0 */ | |
0aa002fe | 1477 | if (!cpu) |
be71b855 AK |
1478 | cmci_recheck(); |
1479 | #endif | |
739f33b3 | 1480 | } |
1da177e4 | 1481 | |
148f9bb8 | 1482 | void end_local_APIC_setup(void) |
739f33b3 AK |
1483 | { |
1484 | lapic_setup_esr(); | |
fa6b95fc CG |
1485 | |
1486 | #ifdef CONFIG_X86_32 | |
1b4ee4e4 CG |
1487 | { |
1488 | unsigned int value; | |
1489 | /* Disable the local apic timer */ | |
1490 | value = apic_read(APIC_LVTT); | |
1491 | value |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR); | |
1492 | apic_write(APIC_LVTT, value); | |
1493 | } | |
fa6b95fc CG |
1494 | #endif |
1495 | ||
0e078e2f | 1496 | apic_pm_activate(); |
2fb270f3 JB |
1497 | } |
1498 | ||
1499 | void __init bsp_end_local_APIC_setup(void) | |
1500 | { | |
1501 | end_local_APIC_setup(); | |
7f7fbf45 KK |
1502 | |
1503 | /* | |
1504 | * Now that local APIC setup is completed for BP, configure the fault | |
1505 | * handling for interrupt remapping. | |
1506 | */ | |
70733e0c | 1507 | irq_remap_enable_fault_handling(); |
7f7fbf45 | 1508 | |
1da177e4 | 1509 | } |
1da177e4 | 1510 | |
06cd9a7d | 1511 | #ifdef CONFIG_X86_X2APIC |
fb209bd8 YL |
1512 | /* |
1513 | * Need to disable xapic and x2apic at the same time and then enable xapic mode | |
1514 | */ | |
1515 | static inline void __disable_x2apic(u64 msr) | |
1516 | { | |
1517 | wrmsrl(MSR_IA32_APICBASE, | |
1518 | msr & ~(X2APIC_ENABLE | XAPIC_ENABLE)); | |
1519 | wrmsrl(MSR_IA32_APICBASE, msr & ~X2APIC_ENABLE); | |
1520 | } | |
1521 | ||
a31bc327 | 1522 | static __init void disable_x2apic(void) |
fb209bd8 YL |
1523 | { |
1524 | u64 msr; | |
1525 | ||
1526 | if (!cpu_has_x2apic) | |
1527 | return; | |
1528 | ||
1529 | rdmsrl(MSR_IA32_APICBASE, msr); | |
1530 | if (msr & X2APIC_ENABLE) { | |
1531 | u32 x2apic_id = read_apic_id(); | |
1532 | ||
1533 | if (x2apic_id >= 255) | |
1534 | panic("Cannot disable x2apic, id: %08x\n", x2apic_id); | |
1535 | ||
1536 | pr_info("Disabling x2apic\n"); | |
1537 | __disable_x2apic(msr); | |
1538 | ||
a31bc327 YL |
1539 | if (nox2apic) { |
1540 | clear_cpu_cap(&cpu_data(0), X86_FEATURE_X2APIC); | |
1541 | setup_clear_cpu_cap(X86_FEATURE_X2APIC); | |
1542 | } | |
1543 | ||
fb209bd8 YL |
1544 | x2apic_disabled = 1; |
1545 | x2apic_mode = 0; | |
1546 | ||
1547 | register_lapic_address(mp_lapic_addr); | |
1548 | } | |
1549 | } | |
1550 | ||
6e1cb38a SS |
1551 | void check_x2apic(void) |
1552 | { | |
ef1f87aa | 1553 | if (x2apic_enabled()) { |
ba21ebb6 | 1554 | pr_info("x2apic enabled by BIOS, switching to x2apic ops\n"); |
fc1edaf9 | 1555 | x2apic_preenabled = x2apic_mode = 1; |
6e1cb38a SS |
1556 | } |
1557 | } | |
1558 | ||
1559 | void enable_x2apic(void) | |
1560 | { | |
fb209bd8 YL |
1561 | u64 msr; |
1562 | ||
1563 | rdmsrl(MSR_IA32_APICBASE, msr); | |
1564 | if (x2apic_disabled) { | |
1565 | __disable_x2apic(msr); | |
1566 | return; | |
1567 | } | |
6e1cb38a | 1568 | |
fc1edaf9 | 1569 | if (!x2apic_mode) |
06cd9a7d YL |
1570 | return; |
1571 | ||
6e1cb38a | 1572 | if (!(msr & X2APIC_ENABLE)) { |
450b1e8d | 1573 | printk_once(KERN_INFO "Enabling x2apic\n"); |
fb209bd8 | 1574 | wrmsrl(MSR_IA32_APICBASE, msr | X2APIC_ENABLE); |
6e1cb38a SS |
1575 | } |
1576 | } | |
93758238 | 1577 | #endif /* CONFIG_X86_X2APIC */ |
6e1cb38a | 1578 | |
ce69a784 | 1579 | int __init enable_IR(void) |
6e1cb38a | 1580 | { |
d3f13810 | 1581 | #ifdef CONFIG_IRQ_REMAP |
95a02e97 | 1582 | if (!irq_remapping_supported()) { |
93758238 | 1583 | pr_debug("intr-remapping not supported\n"); |
41750d31 | 1584 | return -1; |
6e1cb38a SS |
1585 | } |
1586 | ||
93758238 WH |
1587 | if (!x2apic_preenabled && skip_ioapic_setup) { |
1588 | pr_info("Skipped enabling intr-remap because of skipping " | |
1589 | "io-apic setup\n"); | |
41750d31 | 1590 | return -1; |
6e1cb38a SS |
1591 | } |
1592 | ||
95a02e97 | 1593 | return irq_remapping_enable(); |
ce69a784 | 1594 | #endif |
41750d31 | 1595 | return -1; |
ce69a784 GN |
1596 | } |
1597 | ||
1598 | void __init enable_IR_x2apic(void) | |
1599 | { | |
1600 | unsigned long flags; | |
ce69a784 | 1601 | int ret, x2apic_enabled = 0; |
736baef4 | 1602 | int hardware_init_ret; |
b7f42ab2 | 1603 | |
736baef4 | 1604 | /* Make sure irq_remap_ops are initialized */ |
95a02e97 | 1605 | setup_irq_remapping_ops(); |
736baef4 | 1606 | |
95a02e97 | 1607 | hardware_init_ret = irq_remapping_prepare(); |
736baef4 | 1608 | if (hardware_init_ret && !x2apic_supported()) |
e670761f | 1609 | return; |
ce69a784 | 1610 | |
31dce14a | 1611 | ret = save_ioapic_entries(); |
5ffa4eb2 | 1612 | if (ret) { |
ba21ebb6 | 1613 | pr_info("Saving IO-APIC state failed: %d\n", ret); |
fb209bd8 | 1614 | return; |
5ffa4eb2 | 1615 | } |
6e1cb38a | 1616 | |
05c3dc2c | 1617 | local_irq_save(flags); |
b81bb373 | 1618 | legacy_pic->mask_all(); |
31dce14a | 1619 | mask_ioapic_entries(); |
05c3dc2c | 1620 | |
a31bc327 YL |
1621 | if (x2apic_preenabled && nox2apic) |
1622 | disable_x2apic(); | |
1623 | ||
736baef4 | 1624 | if (hardware_init_ret) |
41750d31 | 1625 | ret = -1; |
b7f42ab2 YL |
1626 | else |
1627 | ret = enable_IR(); | |
1628 | ||
fb209bd8 | 1629 | if (!x2apic_supported()) |
a31bc327 | 1630 | goto skip_x2apic; |
fb209bd8 | 1631 | |
41750d31 | 1632 | if (ret < 0) { |
ce69a784 GN |
1633 | /* IR is required if there is APIC ID > 255 even when running |
1634 | * under KVM | |
1635 | */ | |
2904ed8d | 1636 | if (max_physical_apicid > 255 || |
fb209bd8 YL |
1637 | !hypervisor_x2apic_available()) { |
1638 | if (x2apic_preenabled) | |
1639 | disable_x2apic(); | |
a31bc327 | 1640 | goto skip_x2apic; |
fb209bd8 | 1641 | } |
ce69a784 GN |
1642 | /* |
1643 | * without IR all CPUs can be addressed by IOAPIC/MSI | |
1644 | * only in physical mode | |
1645 | */ | |
1646 | x2apic_force_phys(); | |
1647 | } | |
6e1cb38a | 1648 | |
fb209bd8 YL |
1649 | if (ret == IRQ_REMAP_XAPIC_MODE) { |
1650 | pr_info("x2apic not enabled, IRQ remapping is in xapic mode\n"); | |
a31bc327 | 1651 | goto skip_x2apic; |
fb209bd8 | 1652 | } |
41750d31 | 1653 | |
ce69a784 | 1654 | x2apic_enabled = 1; |
93758238 | 1655 | |
fc1edaf9 SS |
1656 | if (x2apic_supported() && !x2apic_mode) { |
1657 | x2apic_mode = 1; | |
6e1cb38a | 1658 | enable_x2apic(); |
93758238 | 1659 | pr_info("Enabled x2apic\n"); |
6e1cb38a | 1660 | } |
5ffa4eb2 | 1661 | |
a31bc327 | 1662 | skip_x2apic: |
41750d31 | 1663 | if (ret < 0) /* IR enabling failed */ |
31dce14a | 1664 | restore_ioapic_entries(); |
b81bb373 | 1665 | legacy_pic->restore_mask(); |
6e1cb38a | 1666 | local_irq_restore(flags); |
6e1cb38a | 1667 | } |
93758238 | 1668 | |
be7a656f | 1669 | #ifdef CONFIG_X86_64 |
1da177e4 LT |
1670 | /* |
1671 | * Detect and enable local APICs on non-SMP boards. | |
1672 | * Original code written by Keir Fraser. | |
1673 | * On AMD64 we trust the BIOS - if it says no APIC it is likely | |
6935d1f9 | 1674 | * not correctly set up (usually the APIC timer won't work etc.) |
1da177e4 | 1675 | */ |
0e078e2f | 1676 | static int __init detect_init_APIC(void) |
1da177e4 LT |
1677 | { |
1678 | if (!cpu_has_apic) { | |
ba21ebb6 | 1679 | pr_info("No local APIC present\n"); |
1da177e4 LT |
1680 | return -1; |
1681 | } | |
1682 | ||
1683 | mp_lapic_addr = APIC_DEFAULT_PHYS_BASE; | |
1da177e4 LT |
1684 | return 0; |
1685 | } | |
be7a656f | 1686 | #else |
5a7ae78f | 1687 | |
25874a29 | 1688 | static int __init apic_verify(void) |
5a7ae78f TG |
1689 | { |
1690 | u32 features, h, l; | |
1691 | ||
1692 | /* | |
1693 | * The APIC feature bit should now be enabled | |
1694 | * in `cpuid' | |
1695 | */ | |
1696 | features = cpuid_edx(1); | |
1697 | if (!(features & (1 << X86_FEATURE_APIC))) { | |
1698 | pr_warning("Could not enable APIC!\n"); | |
1699 | return -1; | |
1700 | } | |
1701 | set_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC); | |
1702 | mp_lapic_addr = APIC_DEFAULT_PHYS_BASE; | |
1703 | ||
1704 | /* The BIOS may have set up the APIC at some other address */ | |
cbf2829b BD |
1705 | if (boot_cpu_data.x86 >= 6) { |
1706 | rdmsr(MSR_IA32_APICBASE, l, h); | |
1707 | if (l & MSR_IA32_APICBASE_ENABLE) | |
1708 | mp_lapic_addr = l & MSR_IA32_APICBASE_BASE; | |
1709 | } | |
5a7ae78f TG |
1710 | |
1711 | pr_info("Found and enabled local APIC!\n"); | |
1712 | return 0; | |
1713 | } | |
1714 | ||
25874a29 | 1715 | int __init apic_force_enable(unsigned long addr) |
5a7ae78f TG |
1716 | { |
1717 | u32 h, l; | |
1718 | ||
1719 | if (disable_apic) | |
1720 | return -1; | |
1721 | ||
1722 | /* | |
1723 | * Some BIOSes disable the local APIC in the APIC_BASE | |
1724 | * MSR. This can only be done in software for Intel P6 or later | |
1725 | * and AMD K7 (Model > 1) or later. | |
1726 | */ | |
cbf2829b BD |
1727 | if (boot_cpu_data.x86 >= 6) { |
1728 | rdmsr(MSR_IA32_APICBASE, l, h); | |
1729 | if (!(l & MSR_IA32_APICBASE_ENABLE)) { | |
1730 | pr_info("Local APIC disabled by BIOS -- reenabling.\n"); | |
1731 | l &= ~MSR_IA32_APICBASE_BASE; | |
1732 | l |= MSR_IA32_APICBASE_ENABLE | addr; | |
1733 | wrmsr(MSR_IA32_APICBASE, l, h); | |
1734 | enabled_via_apicbase = 1; | |
1735 | } | |
5a7ae78f TG |
1736 | } |
1737 | return apic_verify(); | |
1738 | } | |
1739 | ||
be7a656f YL |
1740 | /* |
1741 | * Detect and initialize APIC | |
1742 | */ | |
1743 | static int __init detect_init_APIC(void) | |
1744 | { | |
be7a656f YL |
1745 | /* Disabled by kernel option? */ |
1746 | if (disable_apic) | |
1747 | return -1; | |
1748 | ||
1749 | switch (boot_cpu_data.x86_vendor) { | |
1750 | case X86_VENDOR_AMD: | |
1751 | if ((boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model > 1) || | |
85877061 | 1752 | (boot_cpu_data.x86 >= 15)) |
be7a656f YL |
1753 | break; |
1754 | goto no_apic; | |
1755 | case X86_VENDOR_INTEL: | |
1756 | if (boot_cpu_data.x86 == 6 || boot_cpu_data.x86 == 15 || | |
1757 | (boot_cpu_data.x86 == 5 && cpu_has_apic)) | |
1758 | break; | |
1759 | goto no_apic; | |
1760 | default: | |
1761 | goto no_apic; | |
1762 | } | |
1763 | ||
1764 | if (!cpu_has_apic) { | |
1765 | /* | |
1766 | * Over-ride BIOS and try to enable the local APIC only if | |
1767 | * "lapic" specified. | |
1768 | */ | |
1769 | if (!force_enable_local_apic) { | |
ba21ebb6 CG |
1770 | pr_info("Local APIC disabled by BIOS -- " |
1771 | "you can enable it with \"lapic\"\n"); | |
be7a656f YL |
1772 | return -1; |
1773 | } | |
a906fdaa | 1774 | if (apic_force_enable(APIC_DEFAULT_PHYS_BASE)) |
5a7ae78f TG |
1775 | return -1; |
1776 | } else { | |
1777 | if (apic_verify()) | |
1778 | return -1; | |
be7a656f | 1779 | } |
be7a656f YL |
1780 | |
1781 | apic_pm_activate(); | |
1782 | ||
1783 | return 0; | |
1784 | ||
1785 | no_apic: | |
ba21ebb6 | 1786 | pr_info("No local APIC present or hardware disabled\n"); |
be7a656f YL |
1787 | return -1; |
1788 | } | |
1789 | #endif | |
1da177e4 | 1790 | |
0e078e2f TG |
1791 | /** |
1792 | * init_apic_mappings - initialize APIC mappings | |
1793 | */ | |
1da177e4 LT |
1794 | void __init init_apic_mappings(void) |
1795 | { | |
4401da61 YL |
1796 | unsigned int new_apicid; |
1797 | ||
fc1edaf9 | 1798 | if (x2apic_mode) { |
4c9961d5 | 1799 | boot_cpu_physical_apicid = read_apic_id(); |
6e1cb38a SS |
1800 | return; |
1801 | } | |
1802 | ||
4797f6b0 | 1803 | /* If no local APIC can be found return early */ |
1da177e4 | 1804 | if (!smp_found_config && detect_init_APIC()) { |
4797f6b0 YL |
1805 | /* lets NOP'ify apic operations */ |
1806 | pr_info("APIC: disable apic facility\n"); | |
1807 | apic_disable(); | |
1808 | } else { | |
1da177e4 LT |
1809 | apic_phys = mp_lapic_addr; |
1810 | ||
4797f6b0 YL |
1811 | /* |
1812 | * acpi lapic path already maps that address in | |
1813 | * acpi_register_lapic_address() | |
1814 | */ | |
5989cd6a | 1815 | if (!acpi_lapic && !smp_found_config) |
326a2e6b | 1816 | register_lapic_address(apic_phys); |
cec6be6d | 1817 | } |
1da177e4 LT |
1818 | |
1819 | /* | |
1820 | * Fetch the APIC ID of the BSP in case we have a | |
1821 | * default configuration (or the MP table is broken). | |
1822 | */ | |
4401da61 YL |
1823 | new_apicid = read_apic_id(); |
1824 | if (boot_cpu_physical_apicid != new_apicid) { | |
1825 | boot_cpu_physical_apicid = new_apicid; | |
103428e5 CG |
1826 | /* |
1827 | * yeah -- we lie about apic_version | |
1828 | * in case if apic was disabled via boot option | |
1829 | * but it's not a problem for SMP compiled kernel | |
1830 | * since smp_sanity_check is prepared for such a case | |
1831 | * and disable smp mode | |
1832 | */ | |
4401da61 YL |
1833 | apic_version[new_apicid] = |
1834 | GET_APIC_VERSION(apic_read(APIC_LVR)); | |
08306ce6 | 1835 | } |
1da177e4 LT |
1836 | } |
1837 | ||
c0104d38 YL |
1838 | void __init register_lapic_address(unsigned long address) |
1839 | { | |
1840 | mp_lapic_addr = address; | |
1841 | ||
0450193b YL |
1842 | if (!x2apic_mode) { |
1843 | set_fixmap_nocache(FIX_APIC_BASE, address); | |
1844 | apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n", | |
1845 | APIC_BASE, mp_lapic_addr); | |
1846 | } | |
c0104d38 YL |
1847 | if (boot_cpu_physical_apicid == -1U) { |
1848 | boot_cpu_physical_apicid = read_apic_id(); | |
1849 | apic_version[boot_cpu_physical_apicid] = | |
1850 | GET_APIC_VERSION(apic_read(APIC_LVR)); | |
1851 | } | |
1852 | } | |
1853 | ||
1da177e4 | 1854 | /* |
0e078e2f TG |
1855 | * This initializes the IO-APIC and APIC hardware if this is |
1856 | * a UP kernel. | |
1da177e4 | 1857 | */ |
56d91f13 | 1858 | int apic_version[MAX_LOCAL_APIC]; |
1b313f4a | 1859 | |
0e078e2f | 1860 | int __init APIC_init_uniprocessor(void) |
1da177e4 | 1861 | { |
0e078e2f | 1862 | if (disable_apic) { |
ba21ebb6 | 1863 | pr_info("Apic disabled\n"); |
0e078e2f TG |
1864 | return -1; |
1865 | } | |
f1182638 | 1866 | #ifdef CONFIG_X86_64 |
0e078e2f TG |
1867 | if (!cpu_has_apic) { |
1868 | disable_apic = 1; | |
ba21ebb6 | 1869 | pr_info("Apic disabled by BIOS\n"); |
0e078e2f TG |
1870 | return -1; |
1871 | } | |
fa2bd35a YL |
1872 | #else |
1873 | if (!smp_found_config && !cpu_has_apic) | |
1874 | return -1; | |
1875 | ||
1876 | /* | |
1877 | * Complain if the BIOS pretends there is one. | |
1878 | */ | |
1879 | if (!cpu_has_apic && | |
1880 | APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) { | |
ba21ebb6 CG |
1881 | pr_err("BIOS bug, local APIC 0x%x not detected!...\n", |
1882 | boot_cpu_physical_apicid); | |
fa2bd35a YL |
1883 | return -1; |
1884 | } | |
1885 | #endif | |
1886 | ||
72ce0165 | 1887 | default_setup_apic_routing(); |
6e1cb38a | 1888 | |
0e078e2f | 1889 | verify_local_APIC(); |
b5841765 GC |
1890 | connect_bsp_APIC(); |
1891 | ||
fa2bd35a | 1892 | #ifdef CONFIG_X86_64 |
c70dcb74 | 1893 | apic_write(APIC_ID, SET_APIC_ID(boot_cpu_physical_apicid)); |
fa2bd35a YL |
1894 | #else |
1895 | /* | |
1896 | * Hack: In case of kdump, after a crash, kernel might be booting | |
1897 | * on a cpu with non-zero lapic id. But boot_cpu_physical_apicid | |
1898 | * might be zero if read from MP tables. Get it from LAPIC. | |
1899 | */ | |
1900 | # ifdef CONFIG_CRASH_DUMP | |
1901 | boot_cpu_physical_apicid = read_apic_id(); | |
1902 | # endif | |
1903 | #endif | |
1904 | physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map); | |
0e078e2f | 1905 | setup_local_APIC(); |
1da177e4 | 1906 | |
88d0f550 | 1907 | #ifdef CONFIG_X86_IO_APIC |
739f33b3 AK |
1908 | /* |
1909 | * Now enable IO-APICs, actually call clear_IO_APIC | |
98c061b6 | 1910 | * We need clear_IO_APIC before enabling error vector |
739f33b3 AK |
1911 | */ |
1912 | if (!skip_ioapic_setup && nr_ioapics) | |
1913 | enable_IO_APIC(); | |
fa2bd35a | 1914 | #endif |
739f33b3 | 1915 | |
2fb270f3 | 1916 | bsp_end_local_APIC_setup(); |
739f33b3 | 1917 | |
fa2bd35a | 1918 | #ifdef CONFIG_X86_IO_APIC |
0e078e2f TG |
1919 | if (smp_found_config && !skip_ioapic_setup && nr_ioapics) |
1920 | setup_IO_APIC(); | |
98c061b6 | 1921 | else { |
0e078e2f | 1922 | nr_ioapics = 0; |
98c061b6 | 1923 | } |
fa2bd35a YL |
1924 | #endif |
1925 | ||
736decac | 1926 | x86_init.timers.setup_percpu_clockev(); |
0e078e2f | 1927 | return 0; |
1da177e4 LT |
1928 | } |
1929 | ||
1930 | /* | |
0e078e2f | 1931 | * Local APIC interrupts |
1da177e4 LT |
1932 | */ |
1933 | ||
0e078e2f TG |
1934 | /* |
1935 | * This interrupt should _never_ happen with our APIC/SMP architecture | |
1936 | */ | |
eddc0e92 | 1937 | static inline void __smp_spurious_interrupt(void) |
1da177e4 | 1938 | { |
dc1528dd YL |
1939 | u32 v; |
1940 | ||
1da177e4 | 1941 | /* |
0e078e2f TG |
1942 | * Check if this really is a spurious interrupt and ACK it |
1943 | * if it is a vectored one. Just in case... | |
1944 | * Spurious interrupts should not be ACKed. | |
1da177e4 | 1945 | */ |
0e078e2f TG |
1946 | v = apic_read(APIC_ISR + ((SPURIOUS_APIC_VECTOR & ~0x1f) >> 1)); |
1947 | if (v & (1 << (SPURIOUS_APIC_VECTOR & 0x1f))) | |
1948 | ack_APIC_irq(); | |
c4d58cbd | 1949 | |
915b0d01 HS |
1950 | inc_irq_stat(irq_spurious_count); |
1951 | ||
dc1528dd | 1952 | /* see sw-dev-man vol 3, chapter 7.4.13.5 */ |
ba21ebb6 CG |
1953 | pr_info("spurious APIC interrupt on CPU#%d, " |
1954 | "should never happen.\n", smp_processor_id()); | |
eddc0e92 SA |
1955 | } |
1956 | ||
1d9090e2 | 1957 | __visible void smp_spurious_interrupt(struct pt_regs *regs) |
eddc0e92 SA |
1958 | { |
1959 | entering_irq(); | |
1960 | __smp_spurious_interrupt(); | |
1961 | exiting_irq(); | |
0e078e2f | 1962 | } |
1da177e4 | 1963 | |
1d9090e2 | 1964 | __visible void smp_trace_spurious_interrupt(struct pt_regs *regs) |
cf910e83 SA |
1965 | { |
1966 | entering_irq(); | |
1967 | trace_spurious_apic_entry(SPURIOUS_APIC_VECTOR); | |
1968 | __smp_spurious_interrupt(); | |
1969 | trace_spurious_apic_exit(SPURIOUS_APIC_VECTOR); | |
1970 | exiting_irq(); | |
0e078e2f | 1971 | } |
1da177e4 | 1972 | |
0e078e2f TG |
1973 | /* |
1974 | * This interrupt should never happen with our APIC/SMP architecture | |
1975 | */ | |
eddc0e92 | 1976 | static inline void __smp_error_interrupt(struct pt_regs *regs) |
0e078e2f | 1977 | { |
60283df7 | 1978 | u32 v; |
2b398bd9 YS |
1979 | u32 i = 0; |
1980 | static const char * const error_interrupt_reason[] = { | |
1981 | "Send CS error", /* APIC Error Bit 0 */ | |
1982 | "Receive CS error", /* APIC Error Bit 1 */ | |
1983 | "Send accept error", /* APIC Error Bit 2 */ | |
1984 | "Receive accept error", /* APIC Error Bit 3 */ | |
1985 | "Redirectable IPI", /* APIC Error Bit 4 */ | |
1986 | "Send illegal vector", /* APIC Error Bit 5 */ | |
1987 | "Received illegal vector", /* APIC Error Bit 6 */ | |
1988 | "Illegal register address", /* APIC Error Bit 7 */ | |
1989 | }; | |
1da177e4 | 1990 | |
0e078e2f | 1991 | /* First tickle the hardware, only then report what went on. -- REW */ |
0e078e2f | 1992 | apic_write(APIC_ESR, 0); |
60283df7 | 1993 | v = apic_read(APIC_ESR); |
0e078e2f TG |
1994 | ack_APIC_irq(); |
1995 | atomic_inc(&irq_err_count); | |
ba7eda4c | 1996 | |
60283df7 RW |
1997 | apic_printk(APIC_DEBUG, KERN_DEBUG "APIC error on CPU%d: %02x", |
1998 | smp_processor_id(), v); | |
2b398bd9 | 1999 | |
60283df7 RW |
2000 | v &= 0xff; |
2001 | while (v) { | |
2002 | if (v & 0x1) | |
2b398bd9 YS |
2003 | apic_printk(APIC_DEBUG, KERN_CONT " : %s", error_interrupt_reason[i]); |
2004 | i++; | |
60283df7 | 2005 | v >>= 1; |
4b8073e4 | 2006 | } |
2b398bd9 YS |
2007 | |
2008 | apic_printk(APIC_DEBUG, KERN_CONT "\n"); | |
2009 | ||
eddc0e92 SA |
2010 | } |
2011 | ||
1d9090e2 | 2012 | __visible void smp_error_interrupt(struct pt_regs *regs) |
eddc0e92 SA |
2013 | { |
2014 | entering_irq(); | |
2015 | __smp_error_interrupt(regs); | |
2016 | exiting_irq(); | |
1da177e4 LT |
2017 | } |
2018 | ||
1d9090e2 | 2019 | __visible void smp_trace_error_interrupt(struct pt_regs *regs) |
cf910e83 SA |
2020 | { |
2021 | entering_irq(); | |
2022 | trace_error_apic_entry(ERROR_APIC_VECTOR); | |
2023 | __smp_error_interrupt(regs); | |
2024 | trace_error_apic_exit(ERROR_APIC_VECTOR); | |
2025 | exiting_irq(); | |
1da177e4 LT |
2026 | } |
2027 | ||
b5841765 | 2028 | /** |
36c9d674 CG |
2029 | * connect_bsp_APIC - attach the APIC to the interrupt system |
2030 | */ | |
b5841765 GC |
2031 | void __init connect_bsp_APIC(void) |
2032 | { | |
36c9d674 CG |
2033 | #ifdef CONFIG_X86_32 |
2034 | if (pic_mode) { | |
2035 | /* | |
2036 | * Do not trust the local APIC being empty at bootup. | |
2037 | */ | |
2038 | clear_local_APIC(); | |
2039 | /* | |
2040 | * PIC mode, enable APIC mode in the IMCR, i.e. connect BSP's | |
2041 | * local APIC to INT and NMI lines. | |
2042 | */ | |
2043 | apic_printk(APIC_VERBOSE, "leaving PIC mode, " | |
2044 | "enabling APIC mode.\n"); | |
c0eaa453 | 2045 | imcr_pic_to_apic(); |
36c9d674 CG |
2046 | } |
2047 | #endif | |
49040333 IM |
2048 | if (apic->enable_apic_mode) |
2049 | apic->enable_apic_mode(); | |
b5841765 GC |
2050 | } |
2051 | ||
274cfe59 CG |
2052 | /** |
2053 | * disconnect_bsp_APIC - detach the APIC from the interrupt system | |
2054 | * @virt_wire_setup: indicates, whether virtual wire mode is selected | |
2055 | * | |
2056 | * Virtual wire mode is necessary to deliver legacy interrupts even when the | |
2057 | * APIC is disabled. | |
2058 | */ | |
0e078e2f | 2059 | void disconnect_bsp_APIC(int virt_wire_setup) |
1da177e4 | 2060 | { |
1b4ee4e4 CG |
2061 | unsigned int value; |
2062 | ||
c177b0bc CG |
2063 | #ifdef CONFIG_X86_32 |
2064 | if (pic_mode) { | |
2065 | /* | |
2066 | * Put the board back into PIC mode (has an effect only on | |
2067 | * certain older boards). Note that APIC interrupts, including | |
2068 | * IPIs, won't work beyond this point! The only exception are | |
2069 | * INIT IPIs. | |
2070 | */ | |
2071 | apic_printk(APIC_VERBOSE, "disabling APIC mode, " | |
2072 | "entering PIC mode.\n"); | |
c0eaa453 | 2073 | imcr_apic_to_pic(); |
c177b0bc CG |
2074 | return; |
2075 | } | |
2076 | #endif | |
2077 | ||
0e078e2f | 2078 | /* Go back to Virtual Wire compatibility mode */ |
1da177e4 | 2079 | |
0e078e2f TG |
2080 | /* For the spurious interrupt use vector F, and enable it */ |
2081 | value = apic_read(APIC_SPIV); | |
2082 | value &= ~APIC_VECTOR_MASK; | |
2083 | value |= APIC_SPIV_APIC_ENABLED; | |
2084 | value |= 0xf; | |
2085 | apic_write(APIC_SPIV, value); | |
b8ce3359 | 2086 | |
0e078e2f TG |
2087 | if (!virt_wire_setup) { |
2088 | /* | |
2089 | * For LVT0 make it edge triggered, active high, | |
2090 | * external and enabled | |
2091 | */ | |
2092 | value = apic_read(APIC_LVT0); | |
2093 | value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING | | |
2094 | APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR | | |
2095 | APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED); | |
2096 | value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING; | |
2097 | value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_EXTINT); | |
2098 | apic_write(APIC_LVT0, value); | |
2099 | } else { | |
2100 | /* Disable LVT0 */ | |
2101 | apic_write(APIC_LVT0, APIC_LVT_MASKED); | |
2102 | } | |
b8ce3359 | 2103 | |
c177b0bc CG |
2104 | /* |
2105 | * For LVT1 make it edge triggered, active high, | |
2106 | * nmi and enabled | |
2107 | */ | |
0e078e2f TG |
2108 | value = apic_read(APIC_LVT1); |
2109 | value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING | | |
2110 | APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR | | |
2111 | APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED); | |
2112 | value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING; | |
2113 | value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_NMI); | |
2114 | apic_write(APIC_LVT1, value); | |
1da177e4 LT |
2115 | } |
2116 | ||
7e1f85f9 | 2117 | int generic_processor_info(int apicid, int version) |
be8a5685 | 2118 | { |
14cb6dcf VG |
2119 | int cpu, max = nr_cpu_ids; |
2120 | bool boot_cpu_detected = physid_isset(boot_cpu_physical_apicid, | |
2121 | phys_cpu_present_map); | |
2122 | ||
151e0c7d HD |
2123 | /* |
2124 | * boot_cpu_physical_apicid is designed to have the apicid | |
2125 | * returned by read_apic_id(), i.e, the apicid of the | |
2126 | * currently booting-up processor. However, on some platforms, | |
2127 | * it is temporarilly modified by the apicid reported as BSP | |
2128 | * through MP table. Concretely: | |
2129 | * | |
2130 | * - arch/x86/kernel/mpparse.c: MP_processor_info() | |
2131 | * - arch/x86/mm/amdtopology.c: amd_numa_init() | |
2132 | * - arch/x86/platform/visws/visws_quirks.c: MP_processor_info() | |
2133 | * | |
2134 | * This function is executed with the modified | |
2135 | * boot_cpu_physical_apicid. So, disabled_cpu_apicid kernel | |
2136 | * parameter doesn't work to disable APs on kdump 2nd kernel. | |
2137 | * | |
2138 | * Since fixing handling of boot_cpu_physical_apicid requires | |
2139 | * another discussion and tests on each platform, we leave it | |
2140 | * for now and here we use read_apic_id() directly in this | |
2141 | * function, generic_processor_info(). | |
2142 | */ | |
2143 | if (disabled_cpu_apicid != BAD_APICID && | |
2144 | disabled_cpu_apicid != read_apic_id() && | |
2145 | disabled_cpu_apicid == apicid) { | |
2146 | int thiscpu = num_processors + disabled_cpus; | |
2147 | ||
2148 | pr_warning("ACPI: Disabling requested cpu." | |
2149 | " Processor %d/0x%x ignored.\n", | |
2150 | thiscpu, apicid); | |
2151 | ||
2152 | disabled_cpus++; | |
2153 | return -ENODEV; | |
2154 | } | |
2155 | ||
14cb6dcf VG |
2156 | /* |
2157 | * If boot cpu has not been detected yet, then only allow upto | |
2158 | * nr_cpu_ids - 1 processors and keep one slot free for boot cpu | |
2159 | */ | |
2160 | if (!boot_cpu_detected && num_processors >= nr_cpu_ids - 1 && | |
2161 | apicid != boot_cpu_physical_apicid) { | |
2162 | int thiscpu = max + disabled_cpus - 1; | |
2163 | ||
2164 | pr_warning( | |
2165 | "ACPI: NR_CPUS/possible_cpus limit of %i almost" | |
2166 | " reached. Keeping one slot for boot cpu." | |
2167 | " Processor %d/0x%x ignored.\n", max, thiscpu, apicid); | |
2168 | ||
2169 | disabled_cpus++; | |
7e1f85f9 | 2170 | return -ENODEV; |
14cb6dcf | 2171 | } |
be8a5685 | 2172 | |
3b11ce7f | 2173 | if (num_processors >= nr_cpu_ids) { |
3b11ce7f MT |
2174 | int thiscpu = max + disabled_cpus; |
2175 | ||
2176 | pr_warning( | |
2177 | "ACPI: NR_CPUS/possible_cpus limit of %i reached." | |
2178 | " Processor %d/0x%x ignored.\n", max, thiscpu, apicid); | |
2179 | ||
2180 | disabled_cpus++; | |
7e1f85f9 | 2181 | return -EINVAL; |
be8a5685 AS |
2182 | } |
2183 | ||
2184 | num_processors++; | |
be8a5685 AS |
2185 | if (apicid == boot_cpu_physical_apicid) { |
2186 | /* | |
2187 | * x86_bios_cpu_apicid is required to have processors listed | |
2188 | * in same order as logical cpu numbers. Hence the first | |
2189 | * entry is BSP, and so on. | |
e5fea868 YL |
2190 | * boot_cpu_init() already hold bit 0 in cpu_present_mask |
2191 | * for BSP. | |
be8a5685 AS |
2192 | */ |
2193 | cpu = 0; | |
e5fea868 YL |
2194 | } else |
2195 | cpu = cpumask_next_zero(-1, cpu_present_mask); | |
2196 | ||
2197 | /* | |
2198 | * Validate version | |
2199 | */ | |
2200 | if (version == 0x0) { | |
2201 | pr_warning("BIOS bug: APIC version is 0 for CPU %d/0x%x, fixing up to 0x10\n", | |
2202 | cpu, apicid); | |
2203 | version = 0x10; | |
be8a5685 | 2204 | } |
e5fea868 YL |
2205 | apic_version[apicid] = version; |
2206 | ||
2207 | if (version != apic_version[boot_cpu_physical_apicid]) { | |
2208 | pr_warning("BIOS bug: APIC version mismatch, boot CPU: %x, CPU %d: version %x\n", | |
2209 | apic_version[boot_cpu_physical_apicid], cpu, version); | |
2210 | } | |
2211 | ||
2212 | physid_set(apicid, phys_cpu_present_map); | |
e0da3364 YL |
2213 | if (apicid > max_physical_apicid) |
2214 | max_physical_apicid = apicid; | |
2215 | ||
3e5095d1 | 2216 | #if defined(CONFIG_SMP) || defined(CONFIG_X86_64) |
f10fcd47 TH |
2217 | early_per_cpu(x86_cpu_to_apicid, cpu) = apicid; |
2218 | early_per_cpu(x86_bios_cpu_apicid, cpu) = apicid; | |
1b313f4a | 2219 | #endif |
acb8bc09 TH |
2220 | #ifdef CONFIG_X86_32 |
2221 | early_per_cpu(x86_cpu_to_logical_apicid, cpu) = | |
2222 | apic->x86_32_early_logical_apicid(cpu); | |
2223 | #endif | |
1de88cd4 MT |
2224 | set_cpu_possible(cpu, true); |
2225 | set_cpu_present(cpu, true); | |
7e1f85f9 JL |
2226 | |
2227 | return cpu; | |
be8a5685 AS |
2228 | } |
2229 | ||
0c81c746 SS |
2230 | int hard_smp_processor_id(void) |
2231 | { | |
2232 | return read_apic_id(); | |
2233 | } | |
1dcdd3d1 IM |
2234 | |
2235 | void default_init_apic_ldr(void) | |
2236 | { | |
2237 | unsigned long val; | |
2238 | ||
2239 | apic_write(APIC_DFR, APIC_DFR_VALUE); | |
2240 | val = apic_read(APIC_LDR) & ~APIC_LDR_MASK; | |
2241 | val |= SET_APIC_LOGICAL_ID(1UL << smp_processor_id()); | |
2242 | apic_write(APIC_LDR, val); | |
2243 | } | |
2244 | ||
ff164324 AG |
2245 | int default_cpu_mask_to_apicid_and(const struct cpumask *cpumask, |
2246 | const struct cpumask *andmask, | |
2247 | unsigned int *apicid) | |
6398268d | 2248 | { |
ea3807ea | 2249 | unsigned int cpu; |
6398268d AG |
2250 | |
2251 | for_each_cpu_and(cpu, cpumask, andmask) { | |
2252 | if (cpumask_test_cpu(cpu, cpu_online_mask)) | |
2253 | break; | |
2254 | } | |
ff164324 | 2255 | |
ea3807ea | 2256 | if (likely(cpu < nr_cpu_ids)) { |
a5a39156 AG |
2257 | *apicid = per_cpu(x86_cpu_to_apicid, cpu); |
2258 | return 0; | |
a5a39156 | 2259 | } |
ea3807ea AG |
2260 | |
2261 | return -EINVAL; | |
6398268d AG |
2262 | } |
2263 | ||
1551df64 MT |
2264 | /* |
2265 | * Override the generic EOI implementation with an optimized version. | |
2266 | * Only called during early boot when only one CPU is active and with | |
2267 | * interrupts disabled, so we know this does not race with actual APIC driver | |
2268 | * use. | |
2269 | */ | |
2270 | void __init apic_set_eoi_write(void (*eoi_write)(u32 reg, u32 v)) | |
2271 | { | |
2272 | struct apic **drv; | |
2273 | ||
2274 | for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) { | |
2275 | /* Should happen once for each apic */ | |
2276 | WARN_ON((*drv)->eoi_write == eoi_write); | |
2277 | (*drv)->eoi_write = eoi_write; | |
2278 | } | |
2279 | } | |
2280 | ||
89039b37 | 2281 | /* |
0e078e2f | 2282 | * Power management |
89039b37 | 2283 | */ |
0e078e2f TG |
2284 | #ifdef CONFIG_PM |
2285 | ||
2286 | static struct { | |
274cfe59 CG |
2287 | /* |
2288 | * 'active' is true if the local APIC was enabled by us and | |
2289 | * not the BIOS; this signifies that we are also responsible | |
2290 | * for disabling it before entering apm/acpi suspend | |
2291 | */ | |
0e078e2f TG |
2292 | int active; |
2293 | /* r/w apic fields */ | |
2294 | unsigned int apic_id; | |
2295 | unsigned int apic_taskpri; | |
2296 | unsigned int apic_ldr; | |
2297 | unsigned int apic_dfr; | |
2298 | unsigned int apic_spiv; | |
2299 | unsigned int apic_lvtt; | |
2300 | unsigned int apic_lvtpc; | |
2301 | unsigned int apic_lvt0; | |
2302 | unsigned int apic_lvt1; | |
2303 | unsigned int apic_lvterr; | |
2304 | unsigned int apic_tmict; | |
2305 | unsigned int apic_tdcr; | |
2306 | unsigned int apic_thmr; | |
2307 | } apic_pm_state; | |
2308 | ||
f3c6ea1b | 2309 | static int lapic_suspend(void) |
0e078e2f TG |
2310 | { |
2311 | unsigned long flags; | |
2312 | int maxlvt; | |
89039b37 | 2313 | |
0e078e2f TG |
2314 | if (!apic_pm_state.active) |
2315 | return 0; | |
89039b37 | 2316 | |
0e078e2f | 2317 | maxlvt = lapic_get_maxlvt(); |
89039b37 | 2318 | |
2d7a66d0 | 2319 | apic_pm_state.apic_id = apic_read(APIC_ID); |
0e078e2f TG |
2320 | apic_pm_state.apic_taskpri = apic_read(APIC_TASKPRI); |
2321 | apic_pm_state.apic_ldr = apic_read(APIC_LDR); | |
2322 | apic_pm_state.apic_dfr = apic_read(APIC_DFR); | |
2323 | apic_pm_state.apic_spiv = apic_read(APIC_SPIV); | |
2324 | apic_pm_state.apic_lvtt = apic_read(APIC_LVTT); | |
2325 | if (maxlvt >= 4) | |
2326 | apic_pm_state.apic_lvtpc = apic_read(APIC_LVTPC); | |
2327 | apic_pm_state.apic_lvt0 = apic_read(APIC_LVT0); | |
2328 | apic_pm_state.apic_lvt1 = apic_read(APIC_LVT1); | |
2329 | apic_pm_state.apic_lvterr = apic_read(APIC_LVTERR); | |
2330 | apic_pm_state.apic_tmict = apic_read(APIC_TMICT); | |
2331 | apic_pm_state.apic_tdcr = apic_read(APIC_TDCR); | |
4efc0670 | 2332 | #ifdef CONFIG_X86_THERMAL_VECTOR |
0e078e2f TG |
2333 | if (maxlvt >= 5) |
2334 | apic_pm_state.apic_thmr = apic_read(APIC_LVTTHMR); | |
2335 | #endif | |
24968cfd | 2336 | |
0e078e2f TG |
2337 | local_irq_save(flags); |
2338 | disable_local_APIC(); | |
fc1edaf9 | 2339 | |
70733e0c | 2340 | irq_remapping_disable(); |
fc1edaf9 | 2341 | |
0e078e2f TG |
2342 | local_irq_restore(flags); |
2343 | return 0; | |
1da177e4 LT |
2344 | } |
2345 | ||
f3c6ea1b | 2346 | static void lapic_resume(void) |
1da177e4 | 2347 | { |
0e078e2f TG |
2348 | unsigned int l, h; |
2349 | unsigned long flags; | |
31dce14a | 2350 | int maxlvt; |
b24696bc | 2351 | |
0e078e2f | 2352 | if (!apic_pm_state.active) |
f3c6ea1b | 2353 | return; |
89b831ef | 2354 | |
0e078e2f | 2355 | local_irq_save(flags); |
336224ba JR |
2356 | |
2357 | /* | |
2358 | * IO-APIC and PIC have their own resume routines. | |
2359 | * We just mask them here to make sure the interrupt | |
2360 | * subsystem is completely quiet while we enable x2apic | |
2361 | * and interrupt-remapping. | |
2362 | */ | |
2363 | mask_ioapic_entries(); | |
2364 | legacy_pic->mask_all(); | |
92206c90 | 2365 | |
fc1edaf9 | 2366 | if (x2apic_mode) |
92206c90 | 2367 | enable_x2apic(); |
cf6567fe | 2368 | else { |
92206c90 CG |
2369 | /* |
2370 | * Make sure the APICBASE points to the right address | |
2371 | * | |
2372 | * FIXME! This will be wrong if we ever support suspend on | |
2373 | * SMP! We'll need to do this as part of the CPU restore! | |
2374 | */ | |
cbf2829b BD |
2375 | if (boot_cpu_data.x86 >= 6) { |
2376 | rdmsr(MSR_IA32_APICBASE, l, h); | |
2377 | l &= ~MSR_IA32_APICBASE_BASE; | |
2378 | l |= MSR_IA32_APICBASE_ENABLE | mp_lapic_addr; | |
2379 | wrmsr(MSR_IA32_APICBASE, l, h); | |
2380 | } | |
d5e629a6 | 2381 | } |
6e1cb38a | 2382 | |
b24696bc | 2383 | maxlvt = lapic_get_maxlvt(); |
0e078e2f TG |
2384 | apic_write(APIC_LVTERR, ERROR_APIC_VECTOR | APIC_LVT_MASKED); |
2385 | apic_write(APIC_ID, apic_pm_state.apic_id); | |
2386 | apic_write(APIC_DFR, apic_pm_state.apic_dfr); | |
2387 | apic_write(APIC_LDR, apic_pm_state.apic_ldr); | |
2388 | apic_write(APIC_TASKPRI, apic_pm_state.apic_taskpri); | |
2389 | apic_write(APIC_SPIV, apic_pm_state.apic_spiv); | |
2390 | apic_write(APIC_LVT0, apic_pm_state.apic_lvt0); | |
2391 | apic_write(APIC_LVT1, apic_pm_state.apic_lvt1); | |
71c69f7f | 2392 | #if defined(CONFIG_X86_MCE_INTEL) |
0e078e2f TG |
2393 | if (maxlvt >= 5) |
2394 | apic_write(APIC_LVTTHMR, apic_pm_state.apic_thmr); | |
2395 | #endif | |
2396 | if (maxlvt >= 4) | |
2397 | apic_write(APIC_LVTPC, apic_pm_state.apic_lvtpc); | |
2398 | apic_write(APIC_LVTT, apic_pm_state.apic_lvtt); | |
2399 | apic_write(APIC_TDCR, apic_pm_state.apic_tdcr); | |
2400 | apic_write(APIC_TMICT, apic_pm_state.apic_tmict); | |
2401 | apic_write(APIC_ESR, 0); | |
2402 | apic_read(APIC_ESR); | |
2403 | apic_write(APIC_LVTERR, apic_pm_state.apic_lvterr); | |
2404 | apic_write(APIC_ESR, 0); | |
2405 | apic_read(APIC_ESR); | |
92206c90 | 2406 | |
70733e0c | 2407 | irq_remapping_reenable(x2apic_mode); |
31dce14a | 2408 | |
0e078e2f | 2409 | local_irq_restore(flags); |
0e078e2f | 2410 | } |
b8ce3359 | 2411 | |
274cfe59 CG |
2412 | /* |
2413 | * This device has no shutdown method - fully functioning local APICs | |
2414 | * are needed on every CPU up until machine_halt/restart/poweroff. | |
2415 | */ | |
2416 | ||
f3c6ea1b | 2417 | static struct syscore_ops lapic_syscore_ops = { |
0e078e2f TG |
2418 | .resume = lapic_resume, |
2419 | .suspend = lapic_suspend, | |
2420 | }; | |
b8ce3359 | 2421 | |
148f9bb8 | 2422 | static void apic_pm_activate(void) |
0e078e2f TG |
2423 | { |
2424 | apic_pm_state.active = 1; | |
1da177e4 LT |
2425 | } |
2426 | ||
0e078e2f | 2427 | static int __init init_lapic_sysfs(void) |
1da177e4 | 2428 | { |
0e078e2f | 2429 | /* XXX: remove suspend/resume procs if !apic_pm_state.active? */ |
f3c6ea1b RW |
2430 | if (cpu_has_apic) |
2431 | register_syscore_ops(&lapic_syscore_ops); | |
e83a5fdc | 2432 | |
f3c6ea1b | 2433 | return 0; |
1da177e4 | 2434 | } |
b24696bc FY |
2435 | |
2436 | /* local apic needs to resume before other devices access its registers. */ | |
2437 | core_initcall(init_lapic_sysfs); | |
0e078e2f TG |
2438 | |
2439 | #else /* CONFIG_PM */ | |
2440 | ||
2441 | static void apic_pm_activate(void) { } | |
2442 | ||
2443 | #endif /* CONFIG_PM */ | |
1da177e4 | 2444 | |
f28c0ae2 | 2445 | #ifdef CONFIG_X86_64 |
e0e42142 | 2446 | |
148f9bb8 | 2447 | static int apic_cluster_num(void) |
1da177e4 LT |
2448 | { |
2449 | int i, clusters, zeros; | |
2450 | unsigned id; | |
322850af | 2451 | u16 *bios_cpu_apicid; |
1da177e4 LT |
2452 | DECLARE_BITMAP(clustermap, NUM_APIC_CLUSTERS); |
2453 | ||
23ca4bba | 2454 | bios_cpu_apicid = early_per_cpu_ptr(x86_bios_cpu_apicid); |
376ec33f | 2455 | bitmap_zero(clustermap, NUM_APIC_CLUSTERS); |
1da177e4 | 2456 | |
168ef543 | 2457 | for (i = 0; i < nr_cpu_ids; i++) { |
e8c10ef9 | 2458 | /* are we being called early in kernel startup? */ |
693e3c56 MT |
2459 | if (bios_cpu_apicid) { |
2460 | id = bios_cpu_apicid[i]; | |
e423e33e | 2461 | } else if (i < nr_cpu_ids) { |
e8c10ef9 | 2462 | if (cpu_present(i)) |
2463 | id = per_cpu(x86_bios_cpu_apicid, i); | |
2464 | else | |
2465 | continue; | |
e423e33e | 2466 | } else |
e8c10ef9 | 2467 | break; |
2468 | ||
1da177e4 LT |
2469 | if (id != BAD_APICID) |
2470 | __set_bit(APIC_CLUSTERID(id), clustermap); | |
2471 | } | |
2472 | ||
2473 | /* Problem: Partially populated chassis may not have CPUs in some of | |
2474 | * the APIC clusters they have been allocated. Only present CPUs have | |
602a54a8 | 2475 | * x86_bios_cpu_apicid entries, thus causing zeroes in the bitmap. |
2476 | * Since clusters are allocated sequentially, count zeros only if | |
2477 | * they are bounded by ones. | |
1da177e4 LT |
2478 | */ |
2479 | clusters = 0; | |
2480 | zeros = 0; | |
2481 | for (i = 0; i < NUM_APIC_CLUSTERS; i++) { | |
2482 | if (test_bit(i, clustermap)) { | |
2483 | clusters += 1 + zeros; | |
2484 | zeros = 0; | |
2485 | } else | |
2486 | ++zeros; | |
2487 | } | |
2488 | ||
e0e42142 YL |
2489 | return clusters; |
2490 | } | |
2491 | ||
148f9bb8 PG |
2492 | static int multi_checked; |
2493 | static int multi; | |
e0e42142 | 2494 | |
148f9bb8 | 2495 | static int set_multi(const struct dmi_system_id *d) |
e0e42142 YL |
2496 | { |
2497 | if (multi) | |
2498 | return 0; | |
6f0aced6 | 2499 | pr_info("APIC: %s detected, Multi Chassis\n", d->ident); |
e0e42142 YL |
2500 | multi = 1; |
2501 | return 0; | |
2502 | } | |
2503 | ||
148f9bb8 | 2504 | static const struct dmi_system_id multi_dmi_table[] = { |
e0e42142 YL |
2505 | { |
2506 | .callback = set_multi, | |
2507 | .ident = "IBM System Summit2", | |
2508 | .matches = { | |
2509 | DMI_MATCH(DMI_SYS_VENDOR, "IBM"), | |
2510 | DMI_MATCH(DMI_PRODUCT_NAME, "Summit2"), | |
2511 | }, | |
2512 | }, | |
2513 | {} | |
2514 | }; | |
2515 | ||
148f9bb8 | 2516 | static void dmi_check_multi(void) |
e0e42142 YL |
2517 | { |
2518 | if (multi_checked) | |
2519 | return; | |
2520 | ||
2521 | dmi_check_system(multi_dmi_table); | |
2522 | multi_checked = 1; | |
2523 | } | |
2524 | ||
2525 | /* | |
2526 | * apic_is_clustered_box() -- Check if we can expect good TSC | |
2527 | * | |
2528 | * Thus far, the major user of this is IBM's Summit2 series: | |
2529 | * Clustered boxes may have unsynced TSC problems if they are | |
2530 | * multi-chassis. | |
2531 | * Use DMI to check them | |
2532 | */ | |
148f9bb8 | 2533 | int apic_is_clustered_box(void) |
e0e42142 YL |
2534 | { |
2535 | dmi_check_multi(); | |
2536 | if (multi) | |
1cb68487 RT |
2537 | return 1; |
2538 | ||
e0e42142 YL |
2539 | if (!is_vsmp_box()) |
2540 | return 0; | |
2541 | ||
1da177e4 | 2542 | /* |
e0e42142 YL |
2543 | * ScaleMP vSMPowered boxes have one cluster per board and TSCs are |
2544 | * not guaranteed to be synced between boards | |
1da177e4 | 2545 | */ |
e0e42142 YL |
2546 | if (apic_cluster_num() > 1) |
2547 | return 1; | |
2548 | ||
2549 | return 0; | |
1da177e4 | 2550 | } |
f28c0ae2 | 2551 | #endif |
1da177e4 LT |
2552 | |
2553 | /* | |
0e078e2f | 2554 | * APIC command line parameters |
1da177e4 | 2555 | */ |
789fa735 | 2556 | static int __init setup_disableapic(char *arg) |
6935d1f9 | 2557 | { |
1da177e4 | 2558 | disable_apic = 1; |
9175fc06 | 2559 | setup_clear_cpu_cap(X86_FEATURE_APIC); |
2c8c0e6b AK |
2560 | return 0; |
2561 | } | |
2562 | early_param("disableapic", setup_disableapic); | |
1da177e4 | 2563 | |
2c8c0e6b | 2564 | /* same as disableapic, for compatibility */ |
789fa735 | 2565 | static int __init setup_nolapic(char *arg) |
6935d1f9 | 2566 | { |
789fa735 | 2567 | return setup_disableapic(arg); |
6935d1f9 | 2568 | } |
2c8c0e6b | 2569 | early_param("nolapic", setup_nolapic); |
1da177e4 | 2570 | |
2e7c2838 LT |
2571 | static int __init parse_lapic_timer_c2_ok(char *arg) |
2572 | { | |
2573 | local_apic_timer_c2_ok = 1; | |
2574 | return 0; | |
2575 | } | |
2576 | early_param("lapic_timer_c2_ok", parse_lapic_timer_c2_ok); | |
2577 | ||
36fef094 | 2578 | static int __init parse_disable_apic_timer(char *arg) |
6935d1f9 | 2579 | { |
1da177e4 | 2580 | disable_apic_timer = 1; |
36fef094 | 2581 | return 0; |
6935d1f9 | 2582 | } |
36fef094 CG |
2583 | early_param("noapictimer", parse_disable_apic_timer); |
2584 | ||
2585 | static int __init parse_nolapic_timer(char *arg) | |
2586 | { | |
2587 | disable_apic_timer = 1; | |
2588 | return 0; | |
6935d1f9 | 2589 | } |
36fef094 | 2590 | early_param("nolapic_timer", parse_nolapic_timer); |
73dea47f | 2591 | |
79af9bec CG |
2592 | static int __init apic_set_verbosity(char *arg) |
2593 | { | |
2594 | if (!arg) { | |
2595 | #ifdef CONFIG_X86_64 | |
2596 | skip_ioapic_setup = 0; | |
79af9bec CG |
2597 | return 0; |
2598 | #endif | |
2599 | return -EINVAL; | |
2600 | } | |
2601 | ||
2602 | if (strcmp("debug", arg) == 0) | |
2603 | apic_verbosity = APIC_DEBUG; | |
2604 | else if (strcmp("verbose", arg) == 0) | |
2605 | apic_verbosity = APIC_VERBOSE; | |
2606 | else { | |
ba21ebb6 | 2607 | pr_warning("APIC Verbosity level %s not recognised" |
79af9bec CG |
2608 | " use apic=verbose or apic=debug\n", arg); |
2609 | return -EINVAL; | |
2610 | } | |
2611 | ||
2612 | return 0; | |
2613 | } | |
2614 | early_param("apic", apic_set_verbosity); | |
2615 | ||
1e934dda YL |
2616 | static int __init lapic_insert_resource(void) |
2617 | { | |
2618 | if (!apic_phys) | |
2619 | return -1; | |
2620 | ||
2621 | /* Put local APIC into the resource map. */ | |
2622 | lapic_resource.start = apic_phys; | |
2623 | lapic_resource.end = lapic_resource.start + PAGE_SIZE - 1; | |
2624 | insert_resource(&iomem_resource, &lapic_resource); | |
2625 | ||
2626 | return 0; | |
2627 | } | |
2628 | ||
2629 | /* | |
2630 | * need call insert after e820_reserve_resources() | |
2631 | * that is using request_resource | |
2632 | */ | |
2633 | late_initcall(lapic_insert_resource); | |
151e0c7d HD |
2634 | |
2635 | static int __init apic_set_disabled_cpu_apicid(char *arg) | |
2636 | { | |
2637 | if (!arg || !get_option(&arg, &disabled_cpu_apicid)) | |
2638 | return -EINVAL; | |
2639 | ||
2640 | return 0; | |
2641 | } | |
2642 | early_param("disable_cpu_apicid", apic_set_disabled_cpu_apicid); |