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Commit | Line | Data |
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c767a54b | 1 | /* |
4cedb334 GOC |
2 | * x86 SMP booting functions |
3 | * | |
87c6fe26 | 4 | * (c) 1995 Alan Cox, Building #3 <alan@lxorguk.ukuu.org.uk> |
8f47e163 | 5 | * (c) 1998, 1999, 2000, 2009 Ingo Molnar <mingo@redhat.com> |
4cedb334 GOC |
6 | * Copyright 2001 Andi Kleen, SuSE Labs. |
7 | * | |
8 | * Much of the core SMP work is based on previous work by Thomas Radke, to | |
9 | * whom a great many thanks are extended. | |
10 | * | |
11 | * Thanks to Intel for making available several different Pentium, | |
12 | * Pentium Pro and Pentium-II/Xeon MP machines. | |
13 | * Original development of Linux SMP code supported by Caldera. | |
14 | * | |
15 | * This code is released under the GNU General Public License version 2 or | |
16 | * later. | |
17 | * | |
18 | * Fixes | |
19 | * Felix Koop : NR_CPUS used properly | |
20 | * Jose Renau : Handle single CPU case. | |
21 | * Alan Cox : By repeated request 8) - Total BogoMIPS report. | |
22 | * Greg Wright : Fix for kernel stacks panic. | |
23 | * Erich Boleyn : MP v1.4 and additional changes. | |
24 | * Matthias Sattler : Changes for 2.1 kernel map. | |
25 | * Michel Lespinasse : Changes for 2.1 kernel map. | |
26 | * Michael Chastain : Change trampoline.S to gnu as. | |
27 | * Alan Cox : Dumb bug: 'B' step PPro's are fine | |
28 | * Ingo Molnar : Added APIC timers, based on code | |
29 | * from Jose Renau | |
30 | * Ingo Molnar : various cleanups and rewrites | |
31 | * Tigran Aivazian : fixed "0.00 in /proc/uptime on SMP" bug. | |
32 | * Maciej W. Rozycki : Bits for genuine 82489DX APICs | |
33 | * Andi Kleen : Changed for SMP boot into long mode. | |
34 | * Martin J. Bligh : Added support for multi-quad systems | |
35 | * Dave Jones : Report invalid combinations of Athlon CPUs. | |
36 | * Rusty Russell : Hacked into shape for new "hotplug" boot process. | |
37 | * Andi Kleen : Converted to new state machine. | |
38 | * Ashok Raj : CPU hotplug support | |
39 | * Glauber Costa : i386 and x86_64 integration | |
40 | */ | |
41 | ||
c767a54b JP |
42 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
43 | ||
68a1c3f8 GC |
44 | #include <linux/init.h> |
45 | #include <linux/smp.h> | |
a355352b | 46 | #include <linux/module.h> |
70708a18 | 47 | #include <linux/sched.h> |
69c18c15 | 48 | #include <linux/percpu.h> |
91718e8d | 49 | #include <linux/bootmem.h> |
cb3c8b90 GOC |
50 | #include <linux/err.h> |
51 | #include <linux/nmi.h> | |
69575d38 | 52 | #include <linux/tboot.h> |
35f720c5 | 53 | #include <linux/stackprotector.h> |
5a0e3ad6 | 54 | #include <linux/gfp.h> |
1a022e3f | 55 | #include <linux/cpuidle.h> |
69c18c15 | 56 | |
8aef135c | 57 | #include <asm/acpi.h> |
cb3c8b90 | 58 | #include <asm/desc.h> |
69c18c15 GC |
59 | #include <asm/nmi.h> |
60 | #include <asm/irq.h> | |
07bbc16a | 61 | #include <asm/idle.h> |
48927bbb | 62 | #include <asm/realmode.h> |
69c18c15 GC |
63 | #include <asm/cpu.h> |
64 | #include <asm/numa.h> | |
cb3c8b90 GOC |
65 | #include <asm/pgtable.h> |
66 | #include <asm/tlbflush.h> | |
67 | #include <asm/mtrr.h> | |
ea530692 | 68 | #include <asm/mwait.h> |
7b6aa335 | 69 | #include <asm/apic.h> |
7167d08e | 70 | #include <asm/io_apic.h> |
644c1541 VP |
71 | #include <asm/i387.h> |
72 | #include <asm/fpu-internal.h> | |
569712b2 | 73 | #include <asm/setup.h> |
bdbcdd48 | 74 | #include <asm/uv/uv.h> |
cb3c8b90 | 75 | #include <linux/mc146818rtc.h> |
1164dd00 | 76 | #include <asm/smpboot_hooks.h> |
b81bb373 | 77 | #include <asm/i8259.h> |
48927bbb | 78 | #include <asm/realmode.h> |
646e29a1 | 79 | #include <asm/misc.h> |
48927bbb | 80 | |
a8db8453 GOC |
81 | /* State of each CPU */ |
82 | DEFINE_PER_CPU(int, cpu_state) = { 0 }; | |
83 | ||
a355352b GC |
84 | /* Number of siblings per CPU package */ |
85 | int smp_num_siblings = 1; | |
86 | EXPORT_SYMBOL(smp_num_siblings); | |
87 | ||
88 | /* Last level cache ID of each logical CPU */ | |
0816b0f0 | 89 | DEFINE_PER_CPU_READ_MOSTLY(u16, cpu_llc_id) = BAD_APICID; |
a355352b | 90 | |
a355352b | 91 | /* representing HT siblings of each logical CPU */ |
0816b0f0 | 92 | DEFINE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_sibling_map); |
a355352b GC |
93 | EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); |
94 | ||
95 | /* representing HT and core siblings of each logical CPU */ | |
0816b0f0 | 96 | DEFINE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_core_map); |
a355352b GC |
97 | EXPORT_PER_CPU_SYMBOL(cpu_core_map); |
98 | ||
0816b0f0 | 99 | DEFINE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_llc_shared_map); |
b3d7336d | 100 | |
a355352b GC |
101 | /* Per CPU bogomips and other parameters */ |
102 | DEFINE_PER_CPU_SHARED_ALIGNED(struct cpuinfo_x86, cpu_info); | |
103 | EXPORT_PER_CPU_SYMBOL(cpu_info); | |
768d9505 | 104 | |
2b6163bf | 105 | atomic_t init_deasserted; |
cb3c8b90 | 106 | |
cb3c8b90 | 107 | /* |
30106c17 FY |
108 | * Report back to the Boot Processor during boot time or to the caller processor |
109 | * during CPU online. | |
cb3c8b90 | 110 | */ |
148f9bb8 | 111 | static void smp_callin(void) |
cb3c8b90 GOC |
112 | { |
113 | int cpuid, phys_id; | |
114 | unsigned long timeout; | |
115 | ||
116 | /* | |
117 | * If waken up by an INIT in an 82489DX configuration | |
118 | * we may get here before an INIT-deassert IPI reaches | |
119 | * our local APIC. We have to wait for the IPI or we'll | |
120 | * lock up on an APIC access. | |
e1c467e6 FY |
121 | * |
122 | * Since CPU0 is not wakened up by INIT, it doesn't wait for the IPI. | |
cb3c8b90 | 123 | */ |
e1c467e6 FY |
124 | cpuid = smp_processor_id(); |
125 | if (apic->wait_for_init_deassert && cpuid != 0) | |
a9659366 | 126 | apic->wait_for_init_deassert(&init_deasserted); |
cb3c8b90 GOC |
127 | |
128 | /* | |
129 | * (This works even if the APIC is not enabled.) | |
130 | */ | |
4c9961d5 | 131 | phys_id = read_apic_id(); |
c2d1cec1 | 132 | if (cpumask_test_cpu(cpuid, cpu_callin_mask)) { |
cb3c8b90 GOC |
133 | panic("%s: phys CPU#%d, CPU#%d already present??\n", __func__, |
134 | phys_id, cpuid); | |
135 | } | |
cfc1b9a6 | 136 | pr_debug("CPU#%d (phys ID: %d) waiting for CALLOUT\n", cpuid, phys_id); |
cb3c8b90 GOC |
137 | |
138 | /* | |
139 | * STARTUP IPIs are fragile beasts as they might sometimes | |
140 | * trigger some glue motherboard logic. Complete APIC bus | |
141 | * silence for 1 second, this overestimates the time the | |
142 | * boot CPU is spending to send the up to 2 STARTUP IPIs | |
143 | * by a factor of two. This should be enough. | |
144 | */ | |
145 | ||
146 | /* | |
147 | * Waiting 2s total for startup (udelay is not yet working) | |
148 | */ | |
149 | timeout = jiffies + 2*HZ; | |
150 | while (time_before(jiffies, timeout)) { | |
151 | /* | |
152 | * Has the boot CPU finished it's STARTUP sequence? | |
153 | */ | |
c2d1cec1 | 154 | if (cpumask_test_cpu(cpuid, cpu_callout_mask)) |
cb3c8b90 GOC |
155 | break; |
156 | cpu_relax(); | |
157 | } | |
158 | ||
159 | if (!time_before(jiffies, timeout)) { | |
160 | panic("%s: CPU%d started up but did not get a callout!\n", | |
161 | __func__, cpuid); | |
162 | } | |
163 | ||
164 | /* | |
165 | * the boot CPU has finished the init stage and is spinning | |
166 | * on callin_map until we finish. We are free to set up this | |
167 | * CPU, first the APIC. (this is probably redundant on most | |
168 | * boards) | |
169 | */ | |
170 | ||
c767a54b | 171 | pr_debug("CALLIN, before setup_local_APIC()\n"); |
333344d9 IM |
172 | if (apic->smp_callin_clear_local_apic) |
173 | apic->smp_callin_clear_local_apic(); | |
cb3c8b90 GOC |
174 | setup_local_APIC(); |
175 | end_local_APIC_setup(); | |
cb3c8b90 | 176 | |
9d133e5d SS |
177 | /* |
178 | * Need to setup vector mappings before we enable interrupts. | |
179 | */ | |
36e9e1ea | 180 | setup_vector_irq(smp_processor_id()); |
b565201c JS |
181 | |
182 | /* | |
183 | * Save our processor parameters. Note: this information | |
184 | * is needed for clock calibration. | |
185 | */ | |
186 | smp_store_cpu_info(cpuid); | |
187 | ||
cb3c8b90 GOC |
188 | /* |
189 | * Get our bogomips. | |
b565201c JS |
190 | * Update loops_per_jiffy in cpu_data. Previous call to |
191 | * smp_store_cpu_info() stored a value that is close but not as | |
192 | * accurate as the value just calculated. | |
cb3c8b90 | 193 | */ |
cb3c8b90 | 194 | calibrate_delay(); |
b565201c | 195 | cpu_data(cpuid).loops_per_jiffy = loops_per_jiffy; |
cfc1b9a6 | 196 | pr_debug("Stack at about %p\n", &cpuid); |
cb3c8b90 | 197 | |
5ef428c4 AK |
198 | /* |
199 | * This must be done before setting cpu_online_mask | |
200 | * or calling notify_cpu_starting. | |
201 | */ | |
202 | set_cpu_sibling_map(raw_smp_processor_id()); | |
203 | wmb(); | |
204 | ||
85257024 PZ |
205 | notify_cpu_starting(cpuid); |
206 | ||
cb3c8b90 GOC |
207 | /* |
208 | * Allow the master to continue. | |
209 | */ | |
c2d1cec1 | 210 | cpumask_set_cpu(cpuid, cpu_callin_mask); |
cb3c8b90 GOC |
211 | } |
212 | ||
e1c467e6 FY |
213 | static int cpu0_logical_apicid; |
214 | static int enable_start_cpu0; | |
bbc2ff6a GOC |
215 | /* |
216 | * Activate a secondary processor. | |
217 | */ | |
148f9bb8 | 218 | static void notrace start_secondary(void *unused) |
bbc2ff6a GOC |
219 | { |
220 | /* | |
221 | * Don't put *anything* before cpu_init(), SMP booting is too | |
222 | * fragile that we want to limit the things done here to the | |
223 | * most necessary things. | |
224 | */ | |
b40827fa | 225 | cpu_init(); |
df156f90 | 226 | x86_cpuinit.early_percpu_clock_init(); |
b40827fa BP |
227 | preempt_disable(); |
228 | smp_callin(); | |
fd89a137 | 229 | |
e1c467e6 FY |
230 | enable_start_cpu0 = 0; |
231 | ||
fd89a137 | 232 | #ifdef CONFIG_X86_32 |
b40827fa | 233 | /* switch away from the initial page table */ |
fd89a137 JR |
234 | load_cr3(swapper_pg_dir); |
235 | __flush_tlb_all(); | |
236 | #endif | |
237 | ||
bbc2ff6a GOC |
238 | /* otherwise gcc will move up smp_processor_id before the cpu_init */ |
239 | barrier(); | |
240 | /* | |
241 | * Check TSC synchronization with the BP: | |
242 | */ | |
243 | check_tsc_sync_target(); | |
244 | ||
bbc2ff6a | 245 | /* |
d388e5fd EB |
246 | * We need to hold vector_lock so there the set of online cpus |
247 | * does not change while we are assigning vectors to cpus. Holding | |
248 | * this lock ensures we don't half assign or remove an irq from a cpu. | |
bbc2ff6a | 249 | */ |
d388e5fd | 250 | lock_vector_lock(); |
c2d1cec1 | 251 | set_cpu_online(smp_processor_id(), true); |
d388e5fd | 252 | unlock_vector_lock(); |
bbc2ff6a | 253 | per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE; |
78c06176 | 254 | x86_platform.nmi_init(); |
bbc2ff6a | 255 | |
0cefa5b9 MS |
256 | /* enable local interrupts */ |
257 | local_irq_enable(); | |
258 | ||
35f720c5 JP |
259 | /* to prevent fake stack check failure in clock setup */ |
260 | boot_init_stack_canary(); | |
0cefa5b9 | 261 | |
736decac | 262 | x86_cpuinit.setup_percpu_clockev(); |
bbc2ff6a GOC |
263 | |
264 | wmb(); | |
7d1a9417 | 265 | cpu_startup_entry(CPUHP_ONLINE); |
bbc2ff6a GOC |
266 | } |
267 | ||
30106c17 FY |
268 | void __init smp_store_boot_cpu_info(void) |
269 | { | |
270 | int id = 0; /* CPU 0 */ | |
271 | struct cpuinfo_x86 *c = &cpu_data(id); | |
272 | ||
273 | *c = boot_cpu_data; | |
274 | c->cpu_index = id; | |
275 | } | |
276 | ||
1d89a7f0 GOC |
277 | /* |
278 | * The bootstrap kernel entry code has set these up. Save them for | |
279 | * a given CPU | |
280 | */ | |
148f9bb8 | 281 | void smp_store_cpu_info(int id) |
1d89a7f0 GOC |
282 | { |
283 | struct cpuinfo_x86 *c = &cpu_data(id); | |
284 | ||
b3d7336d | 285 | *c = boot_cpu_data; |
1d89a7f0 | 286 | c->cpu_index = id; |
30106c17 FY |
287 | /* |
288 | * During boot time, CPU0 has this setup already. Save the info when | |
289 | * bringing up AP or offlined CPU0. | |
290 | */ | |
291 | identify_secondary_cpu(c); | |
1d89a7f0 GOC |
292 | } |
293 | ||
148f9bb8 | 294 | static bool |
316ad248 | 295 | topology_sane(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o, const char *name) |
d4fbe4f0 | 296 | { |
316ad248 PZ |
297 | int cpu1 = c->cpu_index, cpu2 = o->cpu_index; |
298 | ||
299 | return !WARN_ONCE(cpu_to_node(cpu1) != cpu_to_node(cpu2), | |
300 | "sched: CPU #%d's %s-sibling CPU #%d is not on the same node! " | |
301 | "[node: %d != %d]. Ignoring dependency.\n", | |
302 | cpu1, name, cpu2, cpu_to_node(cpu1), cpu_to_node(cpu2)); | |
303 | } | |
304 | ||
305 | #define link_mask(_m, c1, c2) \ | |
306 | do { \ | |
307 | cpumask_set_cpu((c1), cpu_##_m##_mask(c2)); \ | |
308 | cpumask_set_cpu((c2), cpu_##_m##_mask(c1)); \ | |
309 | } while (0) | |
310 | ||
148f9bb8 | 311 | static bool match_smt(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o) |
316ad248 | 312 | { |
193f3fcb | 313 | if (cpu_has_topoext) { |
316ad248 PZ |
314 | int cpu1 = c->cpu_index, cpu2 = o->cpu_index; |
315 | ||
316 | if (c->phys_proc_id == o->phys_proc_id && | |
317 | per_cpu(cpu_llc_id, cpu1) == per_cpu(cpu_llc_id, cpu2) && | |
318 | c->compute_unit_id == o->compute_unit_id) | |
319 | return topology_sane(c, o, "smt"); | |
320 | ||
321 | } else if (c->phys_proc_id == o->phys_proc_id && | |
322 | c->cpu_core_id == o->cpu_core_id) { | |
323 | return topology_sane(c, o, "smt"); | |
324 | } | |
325 | ||
326 | return false; | |
327 | } | |
328 | ||
148f9bb8 | 329 | static bool match_llc(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o) |
316ad248 PZ |
330 | { |
331 | int cpu1 = c->cpu_index, cpu2 = o->cpu_index; | |
332 | ||
333 | if (per_cpu(cpu_llc_id, cpu1) != BAD_APICID && | |
334 | per_cpu(cpu_llc_id, cpu1) == per_cpu(cpu_llc_id, cpu2)) | |
335 | return topology_sane(c, o, "llc"); | |
336 | ||
337 | return false; | |
d4fbe4f0 AH |
338 | } |
339 | ||
148f9bb8 | 340 | static bool match_mc(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o) |
316ad248 | 341 | { |
161270fc BP |
342 | if (c->phys_proc_id == o->phys_proc_id) { |
343 | if (cpu_has(c, X86_FEATURE_AMD_DCM)) | |
344 | return true; | |
316ad248 | 345 | |
161270fc BP |
346 | return topology_sane(c, o, "mc"); |
347 | } | |
316ad248 PZ |
348 | return false; |
349 | } | |
1d89a7f0 | 350 | |
148f9bb8 | 351 | void set_cpu_sibling_map(int cpu) |
768d9505 | 352 | { |
316ad248 | 353 | bool has_smt = smp_num_siblings > 1; |
b0bc225d | 354 | bool has_mp = has_smt || boot_cpu_data.x86_max_cores > 1; |
768d9505 | 355 | struct cpuinfo_x86 *c = &cpu_data(cpu); |
316ad248 PZ |
356 | struct cpuinfo_x86 *o; |
357 | int i; | |
768d9505 | 358 | |
c2d1cec1 | 359 | cpumask_set_cpu(cpu, cpu_sibling_setup_mask); |
768d9505 | 360 | |
b0bc225d | 361 | if (!has_mp) { |
c2d1cec1 | 362 | cpumask_set_cpu(cpu, cpu_sibling_mask(cpu)); |
316ad248 PZ |
363 | cpumask_set_cpu(cpu, cpu_llc_shared_mask(cpu)); |
364 | cpumask_set_cpu(cpu, cpu_core_mask(cpu)); | |
768d9505 GC |
365 | c->booted_cores = 1; |
366 | return; | |
367 | } | |
368 | ||
c2d1cec1 | 369 | for_each_cpu(i, cpu_sibling_setup_mask) { |
316ad248 PZ |
370 | o = &cpu_data(i); |
371 | ||
372 | if ((i == cpu) || (has_smt && match_smt(c, o))) | |
373 | link_mask(sibling, cpu, i); | |
374 | ||
b0bc225d | 375 | if ((i == cpu) || (has_mp && match_llc(c, o))) |
316ad248 PZ |
376 | link_mask(llc_shared, cpu, i); |
377 | ||
ceb1cbac KB |
378 | } |
379 | ||
380 | /* | |
381 | * This needs a separate iteration over the cpus because we rely on all | |
382 | * cpu_sibling_mask links to be set-up. | |
383 | */ | |
384 | for_each_cpu(i, cpu_sibling_setup_mask) { | |
385 | o = &cpu_data(i); | |
386 | ||
b0bc225d | 387 | if ((i == cpu) || (has_mp && match_mc(c, o))) { |
316ad248 PZ |
388 | link_mask(core, cpu, i); |
389 | ||
768d9505 GC |
390 | /* |
391 | * Does this new cpu bringup a new core? | |
392 | */ | |
c2d1cec1 | 393 | if (cpumask_weight(cpu_sibling_mask(cpu)) == 1) { |
768d9505 GC |
394 | /* |
395 | * for each core in package, increment | |
396 | * the booted_cores for this new cpu | |
397 | */ | |
c2d1cec1 | 398 | if (cpumask_first(cpu_sibling_mask(i)) == i) |
768d9505 GC |
399 | c->booted_cores++; |
400 | /* | |
401 | * increment the core count for all | |
402 | * the other cpus in this package | |
403 | */ | |
404 | if (i != cpu) | |
405 | cpu_data(i).booted_cores++; | |
406 | } else if (i != cpu && !c->booted_cores) | |
407 | c->booted_cores = cpu_data(i).booted_cores; | |
408 | } | |
409 | } | |
410 | } | |
411 | ||
70708a18 | 412 | /* maps the cpu to the sched domain representing multi-core */ |
030bb203 | 413 | const struct cpumask *cpu_coregroup_mask(int cpu) |
70708a18 | 414 | { |
9f646389 | 415 | return cpu_llc_shared_mask(cpu); |
030bb203 RR |
416 | } |
417 | ||
a4928cff | 418 | static void impress_friends(void) |
904541e2 GOC |
419 | { |
420 | int cpu; | |
421 | unsigned long bogosum = 0; | |
422 | /* | |
423 | * Allow the user to impress friends. | |
424 | */ | |
c767a54b | 425 | pr_debug("Before bogomips\n"); |
904541e2 | 426 | for_each_possible_cpu(cpu) |
c2d1cec1 | 427 | if (cpumask_test_cpu(cpu, cpu_callout_mask)) |
904541e2 | 428 | bogosum += cpu_data(cpu).loops_per_jiffy; |
c767a54b | 429 | pr_info("Total of %d processors activated (%lu.%02lu BogoMIPS)\n", |
f68e00a3 | 430 | num_online_cpus(), |
904541e2 GOC |
431 | bogosum/(500000/HZ), |
432 | (bogosum/(5000/HZ))%100); | |
433 | ||
c767a54b | 434 | pr_debug("Before bogocount - setting activated=1\n"); |
904541e2 GOC |
435 | } |
436 | ||
569712b2 | 437 | void __inquire_remote_apic(int apicid) |
cb3c8b90 GOC |
438 | { |
439 | unsigned i, regs[] = { APIC_ID >> 4, APIC_LVR >> 4, APIC_SPIV >> 4 }; | |
a6c23905 | 440 | const char * const names[] = { "ID", "VERSION", "SPIV" }; |
cb3c8b90 GOC |
441 | int timeout; |
442 | u32 status; | |
443 | ||
c767a54b | 444 | pr_info("Inquiring remote APIC 0x%x...\n", apicid); |
cb3c8b90 GOC |
445 | |
446 | for (i = 0; i < ARRAY_SIZE(regs); i++) { | |
c767a54b | 447 | pr_info("... APIC 0x%x %s: ", apicid, names[i]); |
cb3c8b90 GOC |
448 | |
449 | /* | |
450 | * Wait for idle. | |
451 | */ | |
452 | status = safe_apic_wait_icr_idle(); | |
453 | if (status) | |
c767a54b | 454 | pr_cont("a previous APIC delivery may have failed\n"); |
cb3c8b90 | 455 | |
1b374e4d | 456 | apic_icr_write(APIC_DM_REMRD | regs[i], apicid); |
cb3c8b90 GOC |
457 | |
458 | timeout = 0; | |
459 | do { | |
460 | udelay(100); | |
461 | status = apic_read(APIC_ICR) & APIC_ICR_RR_MASK; | |
462 | } while (status == APIC_ICR_RR_INPROG && timeout++ < 1000); | |
463 | ||
464 | switch (status) { | |
465 | case APIC_ICR_RR_VALID: | |
466 | status = apic_read(APIC_RRR); | |
c767a54b | 467 | pr_cont("%08x\n", status); |
cb3c8b90 GOC |
468 | break; |
469 | default: | |
c767a54b | 470 | pr_cont("failed\n"); |
cb3c8b90 GOC |
471 | } |
472 | } | |
473 | } | |
474 | ||
cb3c8b90 GOC |
475 | /* |
476 | * Poke the other CPU in the eye via NMI to wake it up. Remember that the normal | |
477 | * INIT, INIT, STARTUP sequence will reset the chip hard for us, and this | |
478 | * won't ... remember to clear down the APIC, etc later. | |
479 | */ | |
148f9bb8 | 480 | int |
e1c467e6 | 481 | wakeup_secondary_cpu_via_nmi(int apicid, unsigned long start_eip) |
cb3c8b90 GOC |
482 | { |
483 | unsigned long send_status, accept_status = 0; | |
484 | int maxlvt; | |
485 | ||
486 | /* Target chip */ | |
cb3c8b90 GOC |
487 | /* Boot on the stack */ |
488 | /* Kick the second */ | |
e1c467e6 | 489 | apic_icr_write(APIC_DM_NMI | apic->dest_logical, apicid); |
cb3c8b90 | 490 | |
cfc1b9a6 | 491 | pr_debug("Waiting for send to finish...\n"); |
cb3c8b90 GOC |
492 | send_status = safe_apic_wait_icr_idle(); |
493 | ||
494 | /* | |
495 | * Give the other CPU some time to accept the IPI. | |
496 | */ | |
497 | udelay(200); | |
569712b2 | 498 | if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) { |
59ef48a5 CG |
499 | maxlvt = lapic_get_maxlvt(); |
500 | if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */ | |
501 | apic_write(APIC_ESR, 0); | |
502 | accept_status = (apic_read(APIC_ESR) & 0xEF); | |
503 | } | |
c767a54b | 504 | pr_debug("NMI sent\n"); |
cb3c8b90 GOC |
505 | |
506 | if (send_status) | |
c767a54b | 507 | pr_err("APIC never delivered???\n"); |
cb3c8b90 | 508 | if (accept_status) |
c767a54b | 509 | pr_err("APIC delivery error (%lx)\n", accept_status); |
cb3c8b90 GOC |
510 | |
511 | return (send_status | accept_status); | |
512 | } | |
cb3c8b90 | 513 | |
148f9bb8 | 514 | static int |
569712b2 | 515 | wakeup_secondary_cpu_via_init(int phys_apicid, unsigned long start_eip) |
cb3c8b90 GOC |
516 | { |
517 | unsigned long send_status, accept_status = 0; | |
518 | int maxlvt, num_starts, j; | |
519 | ||
593f4a78 MR |
520 | maxlvt = lapic_get_maxlvt(); |
521 | ||
cb3c8b90 GOC |
522 | /* |
523 | * Be paranoid about clearing APIC errors. | |
524 | */ | |
525 | if (APIC_INTEGRATED(apic_version[phys_apicid])) { | |
593f4a78 MR |
526 | if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */ |
527 | apic_write(APIC_ESR, 0); | |
cb3c8b90 GOC |
528 | apic_read(APIC_ESR); |
529 | } | |
530 | ||
c767a54b | 531 | pr_debug("Asserting INIT\n"); |
cb3c8b90 GOC |
532 | |
533 | /* | |
534 | * Turn INIT on target chip | |
535 | */ | |
cb3c8b90 GOC |
536 | /* |
537 | * Send IPI | |
538 | */ | |
1b374e4d SS |
539 | apic_icr_write(APIC_INT_LEVELTRIG | APIC_INT_ASSERT | APIC_DM_INIT, |
540 | phys_apicid); | |
cb3c8b90 | 541 | |
cfc1b9a6 | 542 | pr_debug("Waiting for send to finish...\n"); |
cb3c8b90 GOC |
543 | send_status = safe_apic_wait_icr_idle(); |
544 | ||
545 | mdelay(10); | |
546 | ||
c767a54b | 547 | pr_debug("Deasserting INIT\n"); |
cb3c8b90 GOC |
548 | |
549 | /* Target chip */ | |
cb3c8b90 | 550 | /* Send IPI */ |
1b374e4d | 551 | apic_icr_write(APIC_INT_LEVELTRIG | APIC_DM_INIT, phys_apicid); |
cb3c8b90 | 552 | |
cfc1b9a6 | 553 | pr_debug("Waiting for send to finish...\n"); |
cb3c8b90 GOC |
554 | send_status = safe_apic_wait_icr_idle(); |
555 | ||
556 | mb(); | |
557 | atomic_set(&init_deasserted, 1); | |
558 | ||
559 | /* | |
560 | * Should we send STARTUP IPIs ? | |
561 | * | |
562 | * Determine this based on the APIC version. | |
563 | * If we don't have an integrated APIC, don't send the STARTUP IPIs. | |
564 | */ | |
565 | if (APIC_INTEGRATED(apic_version[phys_apicid])) | |
566 | num_starts = 2; | |
567 | else | |
568 | num_starts = 0; | |
569 | ||
570 | /* | |
571 | * Paravirt / VMI wants a startup IPI hook here to set up the | |
572 | * target processor state. | |
573 | */ | |
574 | startup_ipi_hook(phys_apicid, (unsigned long) start_secondary, | |
11d4c3f9 | 575 | stack_start); |
cb3c8b90 GOC |
576 | |
577 | /* | |
578 | * Run STARTUP IPI loop. | |
579 | */ | |
c767a54b | 580 | pr_debug("#startup loops: %d\n", num_starts); |
cb3c8b90 | 581 | |
cb3c8b90 | 582 | for (j = 1; j <= num_starts; j++) { |
c767a54b | 583 | pr_debug("Sending STARTUP #%d\n", j); |
593f4a78 MR |
584 | if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */ |
585 | apic_write(APIC_ESR, 0); | |
cb3c8b90 | 586 | apic_read(APIC_ESR); |
c767a54b | 587 | pr_debug("After apic_write\n"); |
cb3c8b90 GOC |
588 | |
589 | /* | |
590 | * STARTUP IPI | |
591 | */ | |
592 | ||
593 | /* Target chip */ | |
cb3c8b90 GOC |
594 | /* Boot on the stack */ |
595 | /* Kick the second */ | |
1b374e4d SS |
596 | apic_icr_write(APIC_DM_STARTUP | (start_eip >> 12), |
597 | phys_apicid); | |
cb3c8b90 GOC |
598 | |
599 | /* | |
600 | * Give the other CPU some time to accept the IPI. | |
601 | */ | |
602 | udelay(300); | |
603 | ||
c767a54b | 604 | pr_debug("Startup point 1\n"); |
cb3c8b90 | 605 | |
cfc1b9a6 | 606 | pr_debug("Waiting for send to finish...\n"); |
cb3c8b90 GOC |
607 | send_status = safe_apic_wait_icr_idle(); |
608 | ||
609 | /* | |
610 | * Give the other CPU some time to accept the IPI. | |
611 | */ | |
612 | udelay(200); | |
593f4a78 | 613 | if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */ |
cb3c8b90 | 614 | apic_write(APIC_ESR, 0); |
cb3c8b90 GOC |
615 | accept_status = (apic_read(APIC_ESR) & 0xEF); |
616 | if (send_status || accept_status) | |
617 | break; | |
618 | } | |
c767a54b | 619 | pr_debug("After Startup\n"); |
cb3c8b90 GOC |
620 | |
621 | if (send_status) | |
c767a54b | 622 | pr_err("APIC never delivered???\n"); |
cb3c8b90 | 623 | if (accept_status) |
c767a54b | 624 | pr_err("APIC delivery error (%lx)\n", accept_status); |
cb3c8b90 GOC |
625 | |
626 | return (send_status | accept_status); | |
627 | } | |
cb3c8b90 | 628 | |
a17bce4d BP |
629 | void smp_announce(void) |
630 | { | |
631 | int num_nodes = num_online_nodes(); | |
632 | ||
633 | printk(KERN_INFO "x86: Booted up %d node%s, %d CPUs\n", | |
634 | num_nodes, (num_nodes > 1 ? "s" : ""), num_online_cpus()); | |
635 | } | |
636 | ||
2eaad1fd | 637 | /* reduce the number of lines printed when booting a large cpu count system */ |
148f9bb8 | 638 | static void announce_cpu(int cpu, int apicid) |
2eaad1fd MT |
639 | { |
640 | static int current_node = -1; | |
4adc8b71 | 641 | int node = early_cpu_to_node(cpu); |
a17bce4d | 642 | static int width, node_width; |
646e29a1 BP |
643 | |
644 | if (!width) | |
645 | width = num_digits(num_possible_cpus()) + 1; /* + '#' sign */ | |
2eaad1fd | 646 | |
a17bce4d BP |
647 | if (!node_width) |
648 | node_width = num_digits(num_possible_nodes()) + 1; /* + '#' */ | |
649 | ||
650 | if (cpu == 1) | |
651 | printk(KERN_INFO "x86: Booting SMP configuration:\n"); | |
652 | ||
2eaad1fd MT |
653 | if (system_state == SYSTEM_BOOTING) { |
654 | if (node != current_node) { | |
655 | if (current_node > (-1)) | |
a17bce4d | 656 | pr_cont("\n"); |
2eaad1fd | 657 | current_node = node; |
a17bce4d BP |
658 | |
659 | printk(KERN_INFO ".... node %*s#%d, CPUs: ", | |
660 | node_width - num_digits(node), " ", node); | |
2eaad1fd | 661 | } |
646e29a1 BP |
662 | |
663 | /* Add padding for the BSP */ | |
664 | if (cpu == 1) | |
665 | pr_cont("%*s", width + 1, " "); | |
666 | ||
667 | pr_cont("%*s#%d", width - num_digits(cpu), " ", cpu); | |
668 | ||
2eaad1fd MT |
669 | } else |
670 | pr_info("Booting Node %d Processor %d APIC 0x%x\n", | |
671 | node, cpu, apicid); | |
672 | } | |
673 | ||
e1c467e6 FY |
674 | static int wakeup_cpu0_nmi(unsigned int cmd, struct pt_regs *regs) |
675 | { | |
676 | int cpu; | |
677 | ||
678 | cpu = smp_processor_id(); | |
679 | if (cpu == 0 && !cpu_online(cpu) && enable_start_cpu0) | |
680 | return NMI_HANDLED; | |
681 | ||
682 | return NMI_DONE; | |
683 | } | |
684 | ||
685 | /* | |
686 | * Wake up AP by INIT, INIT, STARTUP sequence. | |
687 | * | |
688 | * Instead of waiting for STARTUP after INITs, BSP will execute the BIOS | |
689 | * boot-strap code which is not a desired behavior for waking up BSP. To | |
690 | * void the boot-strap code, wake up CPU0 by NMI instead. | |
691 | * | |
692 | * This works to wake up soft offlined CPU0 only. If CPU0 is hard offlined | |
693 | * (i.e. physically hot removed and then hot added), NMI won't wake it up. | |
694 | * We'll change this code in the future to wake up hard offlined CPU0 if | |
695 | * real platform and request are available. | |
696 | */ | |
148f9bb8 | 697 | static int |
e1c467e6 FY |
698 | wakeup_cpu_via_init_nmi(int cpu, unsigned long start_ip, int apicid, |
699 | int *cpu0_nmi_registered) | |
700 | { | |
701 | int id; | |
702 | int boot_error; | |
703 | ||
704 | /* | |
705 | * Wake up AP by INIT, INIT, STARTUP sequence. | |
706 | */ | |
707 | if (cpu) | |
708 | return wakeup_secondary_cpu_via_init(apicid, start_ip); | |
709 | ||
710 | /* | |
711 | * Wake up BSP by nmi. | |
712 | * | |
713 | * Register a NMI handler to help wake up CPU0. | |
714 | */ | |
715 | boot_error = register_nmi_handler(NMI_LOCAL, | |
716 | wakeup_cpu0_nmi, 0, "wake_cpu0"); | |
717 | ||
718 | if (!boot_error) { | |
719 | enable_start_cpu0 = 1; | |
720 | *cpu0_nmi_registered = 1; | |
721 | if (apic->dest_logical == APIC_DEST_LOGICAL) | |
722 | id = cpu0_logical_apicid; | |
723 | else | |
724 | id = apicid; | |
725 | boot_error = wakeup_secondary_cpu_via_nmi(id, start_ip); | |
726 | } | |
727 | ||
728 | return boot_error; | |
729 | } | |
730 | ||
cb3c8b90 GOC |
731 | /* |
732 | * NOTE - on most systems this is a PHYSICAL apic ID, but on multiquad | |
733 | * (ie clustered apic addressing mode), this is a LOGICAL apic ID. | |
1f5bcabf IM |
734 | * Returns zero if CPU booted OK, else error code from |
735 | * ->wakeup_secondary_cpu. | |
cb3c8b90 | 736 | */ |
148f9bb8 | 737 | static int do_boot_cpu(int apicid, int cpu, struct task_struct *idle) |
cb3c8b90 | 738 | { |
48927bbb | 739 | volatile u32 *trampoline_status = |
b429dbf6 | 740 | (volatile u32 *) __va(real_mode_header->trampoline_status); |
48927bbb | 741 | /* start_ip had better be page-aligned! */ |
f37240f1 | 742 | unsigned long start_ip = real_mode_header->trampoline_start; |
48927bbb | 743 | |
cb3c8b90 | 744 | unsigned long boot_error = 0; |
ab6fb7c0 | 745 | int timeout; |
e1c467e6 | 746 | int cpu0_nmi_registered = 0; |
cb3c8b90 | 747 | |
816afe4f RR |
748 | /* Just in case we booted with a single CPU. */ |
749 | alternatives_enable_smp(); | |
cb3c8b90 | 750 | |
7eb43a6d TG |
751 | idle->thread.sp = (unsigned long) (((struct pt_regs *) |
752 | (THREAD_SIZE + task_stack_page(idle))) - 1); | |
753 | per_cpu(current_task, cpu) = idle; | |
cb3c8b90 | 754 | |
c6f5e0ac | 755 | #ifdef CONFIG_X86_32 |
cb3c8b90 | 756 | /* Stack for startup_32 can be just as for start_secondary onwards */ |
cb3c8b90 GOC |
757 | irq_ctx_init(cpu); |
758 | #else | |
7eb43a6d | 759 | clear_tsk_thread_flag(idle, TIF_FORK); |
004aa322 | 760 | initial_gs = per_cpu_offset(cpu); |
9af45651 | 761 | per_cpu(kernel_stack, cpu) = |
7eb43a6d | 762 | (unsigned long)task_stack_page(idle) - |
9af45651 | 763 | KERNEL_STACK_OFFSET + THREAD_SIZE; |
cb3c8b90 | 764 | #endif |
a939098a | 765 | early_gdt_descr.address = (unsigned long)get_cpu_gdt_table(cpu); |
3e970473 | 766 | initial_code = (unsigned long)start_secondary; |
7eb43a6d | 767 | stack_start = idle->thread.sp; |
cb3c8b90 | 768 | |
2eaad1fd MT |
769 | /* So we see what's up */ |
770 | announce_cpu(cpu, apicid); | |
cb3c8b90 GOC |
771 | |
772 | /* | |
773 | * This grunge runs the startup process for | |
774 | * the targeted processor. | |
775 | */ | |
776 | ||
777 | atomic_set(&init_deasserted, 0); | |
778 | ||
34d05591 | 779 | if (get_uv_system_type() != UV_NON_UNIQUE_APIC) { |
cb3c8b90 | 780 | |
cfc1b9a6 | 781 | pr_debug("Setting warm reset code and vector.\n"); |
cb3c8b90 | 782 | |
34d05591 JS |
783 | smpboot_setup_warm_reset_vector(start_ip); |
784 | /* | |
785 | * Be paranoid about clearing APIC errors. | |
db96b0a0 CG |
786 | */ |
787 | if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) { | |
788 | apic_write(APIC_ESR, 0); | |
789 | apic_read(APIC_ESR); | |
790 | } | |
34d05591 | 791 | } |
cb3c8b90 | 792 | |
cb3c8b90 | 793 | /* |
e1c467e6 FY |
794 | * Wake up a CPU in difference cases: |
795 | * - Use the method in the APIC driver if it's defined | |
796 | * Otherwise, | |
797 | * - Use an INIT boot APIC message for APs or NMI for BSP. | |
cb3c8b90 | 798 | */ |
1f5bcabf IM |
799 | if (apic->wakeup_secondary_cpu) |
800 | boot_error = apic->wakeup_secondary_cpu(apicid, start_ip); | |
801 | else | |
e1c467e6 FY |
802 | boot_error = wakeup_cpu_via_init_nmi(cpu, start_ip, apicid, |
803 | &cpu0_nmi_registered); | |
cb3c8b90 GOC |
804 | |
805 | if (!boot_error) { | |
806 | /* | |
807 | * allow APs to start initializing. | |
808 | */ | |
c767a54b | 809 | pr_debug("Before Callout %d\n", cpu); |
c2d1cec1 | 810 | cpumask_set_cpu(cpu, cpu_callout_mask); |
c767a54b | 811 | pr_debug("After Callout %d\n", cpu); |
cb3c8b90 GOC |
812 | |
813 | /* | |
814 | * Wait 5s total for a response | |
815 | */ | |
816 | for (timeout = 0; timeout < 50000; timeout++) { | |
c2d1cec1 | 817 | if (cpumask_test_cpu(cpu, cpu_callin_mask)) |
cb3c8b90 GOC |
818 | break; /* It has booted */ |
819 | udelay(100); | |
68f202e4 SS |
820 | /* |
821 | * Allow other tasks to run while we wait for the | |
822 | * AP to come online. This also gives a chance | |
823 | * for the MTRR work(triggered by the AP coming online) | |
824 | * to be completed in the stop machine context. | |
825 | */ | |
826 | schedule(); | |
cb3c8b90 GOC |
827 | } |
828 | ||
21c3fcf3 YL |
829 | if (cpumask_test_cpu(cpu, cpu_callin_mask)) { |
830 | print_cpu_msr(&cpu_data(cpu)); | |
2eaad1fd | 831 | pr_debug("CPU%d: has booted.\n", cpu); |
21c3fcf3 | 832 | } else { |
cb3c8b90 | 833 | boot_error = 1; |
48927bbb | 834 | if (*trampoline_status == 0xA5A5A5A5) |
cb3c8b90 | 835 | /* trampoline started but...? */ |
2eaad1fd | 836 | pr_err("CPU%d: Stuck ??\n", cpu); |
cb3c8b90 GOC |
837 | else |
838 | /* trampoline code not run */ | |
c767a54b | 839 | pr_err("CPU%d: Not responding\n", cpu); |
25dc0049 IM |
840 | if (apic->inquire_remote_apic) |
841 | apic->inquire_remote_apic(apicid); | |
cb3c8b90 GOC |
842 | } |
843 | } | |
1a51e3a0 | 844 | |
cb3c8b90 GOC |
845 | if (boot_error) { |
846 | /* Try to put things back the way they were before ... */ | |
23ca4bba | 847 | numa_remove_cpu(cpu); /* was set by numa_add_cpu */ |
c2d1cec1 MT |
848 | |
849 | /* was set by do_boot_cpu() */ | |
850 | cpumask_clear_cpu(cpu, cpu_callout_mask); | |
851 | ||
852 | /* was set by cpu_init() */ | |
853 | cpumask_clear_cpu(cpu, cpu_initialized_mask); | |
854 | ||
855 | set_cpu_present(cpu, false); | |
cb3c8b90 GOC |
856 | per_cpu(x86_cpu_to_apicid, cpu) = BAD_APICID; |
857 | } | |
858 | ||
859 | /* mark "stuck" area as not stuck */ | |
48927bbb | 860 | *trampoline_status = 0; |
cb3c8b90 | 861 | |
02421f98 YL |
862 | if (get_uv_system_type() != UV_NON_UNIQUE_APIC) { |
863 | /* | |
864 | * Cleanup possible dangling ends... | |
865 | */ | |
866 | smpboot_restore_warm_reset_vector(); | |
867 | } | |
e1c467e6 FY |
868 | /* |
869 | * Clean up the nmi handler. Do this after the callin and callout sync | |
870 | * to avoid impact of possible long unregister time. | |
871 | */ | |
872 | if (cpu0_nmi_registered) | |
873 | unregister_nmi_handler(NMI_LOCAL, "wake_cpu0"); | |
874 | ||
cb3c8b90 GOC |
875 | return boot_error; |
876 | } | |
877 | ||
148f9bb8 | 878 | int native_cpu_up(unsigned int cpu, struct task_struct *tidle) |
cb3c8b90 | 879 | { |
a21769a4 | 880 | int apicid = apic->cpu_present_to_apicid(cpu); |
cb3c8b90 GOC |
881 | unsigned long flags; |
882 | int err; | |
883 | ||
884 | WARN_ON(irqs_disabled()); | |
885 | ||
cfc1b9a6 | 886 | pr_debug("++++++++++++++++++++=_---CPU UP %u\n", cpu); |
cb3c8b90 | 887 | |
30106c17 | 888 | if (apicid == BAD_APICID || |
c284b42a | 889 | !physid_isset(apicid, phys_cpu_present_map) || |
fa63030e | 890 | !apic->apic_id_valid(apicid)) { |
c767a54b | 891 | pr_err("%s: bad cpu %d\n", __func__, cpu); |
cb3c8b90 GOC |
892 | return -EINVAL; |
893 | } | |
894 | ||
895 | /* | |
896 | * Already booted CPU? | |
897 | */ | |
c2d1cec1 | 898 | if (cpumask_test_cpu(cpu, cpu_callin_mask)) { |
cfc1b9a6 | 899 | pr_debug("do_boot_cpu %d Already started\n", cpu); |
cb3c8b90 GOC |
900 | return -ENOSYS; |
901 | } | |
902 | ||
903 | /* | |
904 | * Save current MTRR state in case it was changed since early boot | |
905 | * (e.g. by the ACPI SMI) to initialize new CPUs with MTRRs in sync: | |
906 | */ | |
907 | mtrr_save_state(); | |
908 | ||
909 | per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; | |
910 | ||
644c1541 VP |
911 | /* the FPU context is blank, nobody can own it */ |
912 | __cpu_disable_lazy_restore(cpu); | |
913 | ||
7eb43a6d | 914 | err = do_boot_cpu(apicid, cpu, tidle); |
61165d7a | 915 | if (err) { |
cfc1b9a6 | 916 | pr_debug("do_boot_cpu failed %d\n", err); |
61165d7a | 917 | return -EIO; |
cb3c8b90 GOC |
918 | } |
919 | ||
920 | /* | |
921 | * Check TSC synchronization with the AP (keep irqs disabled | |
922 | * while doing so): | |
923 | */ | |
924 | local_irq_save(flags); | |
925 | check_tsc_sync_source(cpu); | |
926 | local_irq_restore(flags); | |
927 | ||
7c04e64a | 928 | while (!cpu_online(cpu)) { |
cb3c8b90 GOC |
929 | cpu_relax(); |
930 | touch_nmi_watchdog(); | |
931 | } | |
932 | ||
933 | return 0; | |
934 | } | |
935 | ||
7167d08e HK |
936 | /** |
937 | * arch_disable_smp_support() - disables SMP support for x86 at runtime | |
938 | */ | |
939 | void arch_disable_smp_support(void) | |
940 | { | |
941 | disable_ioapic_support(); | |
942 | } | |
943 | ||
8aef135c GOC |
944 | /* |
945 | * Fall back to non SMP mode after errors. | |
946 | * | |
947 | * RED-PEN audit/test this more. I bet there is more state messed up here. | |
948 | */ | |
949 | static __init void disable_smp(void) | |
950 | { | |
4f062896 RR |
951 | init_cpu_present(cpumask_of(0)); |
952 | init_cpu_possible(cpumask_of(0)); | |
8aef135c | 953 | smpboot_clear_io_apic_irqs(); |
0f385d1d | 954 | |
8aef135c | 955 | if (smp_found_config) |
b6df1b8b | 956 | physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map); |
8aef135c | 957 | else |
b6df1b8b | 958 | physid_set_mask_of_physid(0, &phys_cpu_present_map); |
c2d1cec1 MT |
959 | cpumask_set_cpu(0, cpu_sibling_mask(0)); |
960 | cpumask_set_cpu(0, cpu_core_mask(0)); | |
8aef135c GOC |
961 | } |
962 | ||
963 | /* | |
964 | * Various sanity checks. | |
965 | */ | |
966 | static int __init smp_sanity_check(unsigned max_cpus) | |
967 | { | |
ac23d4ee | 968 | preempt_disable(); |
a58f03b0 | 969 | |
1ff2f20d | 970 | #if !defined(CONFIG_X86_BIGSMP) && defined(CONFIG_X86_32) |
a58f03b0 YL |
971 | if (def_to_bigsmp && nr_cpu_ids > 8) { |
972 | unsigned int cpu; | |
973 | unsigned nr; | |
974 | ||
c767a54b JP |
975 | pr_warn("More than 8 CPUs detected - skipping them\n" |
976 | "Use CONFIG_X86_BIGSMP\n"); | |
a58f03b0 YL |
977 | |
978 | nr = 0; | |
979 | for_each_present_cpu(cpu) { | |
980 | if (nr >= 8) | |
c2d1cec1 | 981 | set_cpu_present(cpu, false); |
a58f03b0 YL |
982 | nr++; |
983 | } | |
984 | ||
985 | nr = 0; | |
986 | for_each_possible_cpu(cpu) { | |
987 | if (nr >= 8) | |
c2d1cec1 | 988 | set_cpu_possible(cpu, false); |
a58f03b0 YL |
989 | nr++; |
990 | } | |
991 | ||
992 | nr_cpu_ids = 8; | |
993 | } | |
994 | #endif | |
995 | ||
8aef135c | 996 | if (!physid_isset(hard_smp_processor_id(), phys_cpu_present_map)) { |
c767a54b | 997 | pr_warn("weird, boot CPU (#%d) not listed by the BIOS\n", |
55c395b4 MT |
998 | hard_smp_processor_id()); |
999 | ||
8aef135c GOC |
1000 | physid_set(hard_smp_processor_id(), phys_cpu_present_map); |
1001 | } | |
1002 | ||
1003 | /* | |
1004 | * If we couldn't find an SMP configuration at boot time, | |
1005 | * get out of here now! | |
1006 | */ | |
1007 | if (!smp_found_config && !acpi_lapic) { | |
ac23d4ee | 1008 | preempt_enable(); |
c767a54b | 1009 | pr_notice("SMP motherboard not detected\n"); |
8aef135c GOC |
1010 | disable_smp(); |
1011 | if (APIC_init_uniprocessor()) | |
c767a54b | 1012 | pr_notice("Local APIC not detected. Using dummy APIC emulation.\n"); |
8aef135c GOC |
1013 | return -1; |
1014 | } | |
1015 | ||
1016 | /* | |
1017 | * Should not be necessary because the MP table should list the boot | |
1018 | * CPU too, but we do it for the sake of robustness anyway. | |
1019 | */ | |
a27a6210 | 1020 | if (!apic->check_phys_apicid_present(boot_cpu_physical_apicid)) { |
c767a54b JP |
1021 | pr_notice("weird, boot CPU (#%d) not listed by the BIOS\n", |
1022 | boot_cpu_physical_apicid); | |
8aef135c GOC |
1023 | physid_set(hard_smp_processor_id(), phys_cpu_present_map); |
1024 | } | |
ac23d4ee | 1025 | preempt_enable(); |
8aef135c GOC |
1026 | |
1027 | /* | |
1028 | * If we couldn't find a local APIC, then get out of here now! | |
1029 | */ | |
1030 | if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid]) && | |
1031 | !cpu_has_apic) { | |
103428e5 CG |
1032 | if (!disable_apic) { |
1033 | pr_err("BIOS bug, local APIC #%d not detected!...\n", | |
1034 | boot_cpu_physical_apicid); | |
c767a54b | 1035 | pr_err("... forcing use of dummy APIC emulation (tell your hw vendor)\n"); |
103428e5 | 1036 | } |
8aef135c | 1037 | smpboot_clear_io_apic(); |
7167d08e | 1038 | disable_ioapic_support(); |
8aef135c GOC |
1039 | return -1; |
1040 | } | |
1041 | ||
1042 | verify_local_APIC(); | |
1043 | ||
1044 | /* | |
1045 | * If SMP should be disabled, then really disable it! | |
1046 | */ | |
1047 | if (!max_cpus) { | |
c767a54b | 1048 | pr_info("SMP mode deactivated\n"); |
8aef135c | 1049 | smpboot_clear_io_apic(); |
d54db1ac | 1050 | |
e90955c2 | 1051 | connect_bsp_APIC(); |
e90955c2 | 1052 | setup_local_APIC(); |
2fb270f3 | 1053 | bsp_end_local_APIC_setup(); |
8aef135c GOC |
1054 | return -1; |
1055 | } | |
1056 | ||
1057 | return 0; | |
1058 | } | |
1059 | ||
1060 | static void __init smp_cpu_index_default(void) | |
1061 | { | |
1062 | int i; | |
1063 | struct cpuinfo_x86 *c; | |
1064 | ||
7c04e64a | 1065 | for_each_possible_cpu(i) { |
8aef135c GOC |
1066 | c = &cpu_data(i); |
1067 | /* mark all to hotplug */ | |
9628937d | 1068 | c->cpu_index = nr_cpu_ids; |
8aef135c GOC |
1069 | } |
1070 | } | |
1071 | ||
1072 | /* | |
1073 | * Prepare for SMP bootup. The MP table or ACPI has been read | |
1074 | * earlier. Just do some sanity checking here and enable APIC mode. | |
1075 | */ | |
1076 | void __init native_smp_prepare_cpus(unsigned int max_cpus) | |
1077 | { | |
7ad728f9 RR |
1078 | unsigned int i; |
1079 | ||
deef3250 | 1080 | preempt_disable(); |
8aef135c | 1081 | smp_cpu_index_default(); |
792363d2 | 1082 | |
8aef135c GOC |
1083 | /* |
1084 | * Setup boot CPU information | |
1085 | */ | |
30106c17 | 1086 | smp_store_boot_cpu_info(); /* Final full version of the data */ |
792363d2 YL |
1087 | cpumask_copy(cpu_callin_mask, cpumask_of(0)); |
1088 | mb(); | |
bd22a2f1 | 1089 | |
8aef135c | 1090 | current_thread_info()->cpu = 0; /* needed? */ |
7ad728f9 | 1091 | for_each_possible_cpu(i) { |
79f55997 LZ |
1092 | zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL); |
1093 | zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL); | |
b3d7336d | 1094 | zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL); |
7ad728f9 | 1095 | } |
8aef135c GOC |
1096 | set_cpu_sibling_map(0); |
1097 | ||
6e1cb38a | 1098 | |
8aef135c | 1099 | if (smp_sanity_check(max_cpus) < 0) { |
c767a54b | 1100 | pr_info("SMP disabled\n"); |
8aef135c | 1101 | disable_smp(); |
deef3250 | 1102 | goto out; |
8aef135c GOC |
1103 | } |
1104 | ||
fa47f7e5 SS |
1105 | default_setup_apic_routing(); |
1106 | ||
ac23d4ee | 1107 | preempt_disable(); |
4c9961d5 | 1108 | if (read_apic_id() != boot_cpu_physical_apicid) { |
8aef135c | 1109 | panic("Boot APIC ID in local APIC unexpected (%d vs %d)", |
4c9961d5 | 1110 | read_apic_id(), boot_cpu_physical_apicid); |
8aef135c GOC |
1111 | /* Or can we switch back to PIC here? */ |
1112 | } | |
ac23d4ee | 1113 | preempt_enable(); |
8aef135c | 1114 | |
8aef135c | 1115 | connect_bsp_APIC(); |
b5841765 | 1116 | |
8aef135c GOC |
1117 | /* |
1118 | * Switch from PIC to APIC mode. | |
1119 | */ | |
1120 | setup_local_APIC(); | |
1121 | ||
e1c467e6 FY |
1122 | if (x2apic_mode) |
1123 | cpu0_logical_apicid = apic_read(APIC_LDR); | |
1124 | else | |
1125 | cpu0_logical_apicid = GET_APIC_LOGICAL_ID(apic_read(APIC_LDR)); | |
1126 | ||
8aef135c GOC |
1127 | /* |
1128 | * Enable IO APIC before setting up error vector | |
1129 | */ | |
1130 | if (!skip_ioapic_setup && nr_ioapics) | |
1131 | enable_IO_APIC(); | |
88d0f550 | 1132 | |
2fb270f3 | 1133 | bsp_end_local_APIC_setup(); |
8aef135c | 1134 | |
d83093b5 IM |
1135 | if (apic->setup_portio_remap) |
1136 | apic->setup_portio_remap(); | |
8aef135c GOC |
1137 | |
1138 | smpboot_setup_io_apic(); | |
1139 | /* | |
1140 | * Set up local APIC timer on boot CPU. | |
1141 | */ | |
1142 | ||
c767a54b | 1143 | pr_info("CPU%d: ", 0); |
8aef135c | 1144 | print_cpu_info(&cpu_data(0)); |
736decac | 1145 | x86_init.timers.setup_percpu_clockev(); |
c4bd1fda MS |
1146 | |
1147 | if (is_uv_system()) | |
1148 | uv_system_init(); | |
d0af9eed SS |
1149 | |
1150 | set_mtrr_aps_delayed_init(); | |
deef3250 IM |
1151 | out: |
1152 | preempt_enable(); | |
8aef135c | 1153 | } |
d0af9eed SS |
1154 | |
1155 | void arch_enable_nonboot_cpus_begin(void) | |
1156 | { | |
1157 | set_mtrr_aps_delayed_init(); | |
1158 | } | |
1159 | ||
1160 | void arch_enable_nonboot_cpus_end(void) | |
1161 | { | |
1162 | mtrr_aps_init(); | |
1163 | } | |
1164 | ||
a8db8453 GOC |
1165 | /* |
1166 | * Early setup to make printk work. | |
1167 | */ | |
1168 | void __init native_smp_prepare_boot_cpu(void) | |
1169 | { | |
1170 | int me = smp_processor_id(); | |
552be871 | 1171 | switch_to_new_gdt(me); |
c2d1cec1 MT |
1172 | /* already set me in cpu_online_mask in boot_cpu_init() */ |
1173 | cpumask_set_cpu(me, cpu_callout_mask); | |
a8db8453 GOC |
1174 | per_cpu(cpu_state, me) = CPU_ONLINE; |
1175 | } | |
1176 | ||
83f7eb9c GOC |
1177 | void __init native_smp_cpus_done(unsigned int max_cpus) |
1178 | { | |
c767a54b | 1179 | pr_debug("Boot done\n"); |
83f7eb9c | 1180 | |
99e8b9ca | 1181 | nmi_selftest(); |
83f7eb9c | 1182 | impress_friends(); |
83f7eb9c GOC |
1183 | #ifdef CONFIG_X86_IO_APIC |
1184 | setup_ioapic_dest(); | |
1185 | #endif | |
d0af9eed | 1186 | mtrr_aps_init(); |
83f7eb9c GOC |
1187 | } |
1188 | ||
3b11ce7f MT |
1189 | static int __initdata setup_possible_cpus = -1; |
1190 | static int __init _setup_possible_cpus(char *str) | |
1191 | { | |
1192 | get_option(&str, &setup_possible_cpus); | |
1193 | return 0; | |
1194 | } | |
1195 | early_param("possible_cpus", _setup_possible_cpus); | |
1196 | ||
1197 | ||
68a1c3f8 | 1198 | /* |
4f062896 | 1199 | * cpu_possible_mask should be static, it cannot change as cpu's |
68a1c3f8 GC |
1200 | * are onlined, or offlined. The reason is per-cpu data-structures |
1201 | * are allocated by some modules at init time, and dont expect to | |
1202 | * do this dynamically on cpu arrival/departure. | |
4f062896 | 1203 | * cpu_present_mask on the other hand can change dynamically. |
68a1c3f8 GC |
1204 | * In case when cpu_hotplug is not compiled, then we resort to current |
1205 | * behaviour, which is cpu_possible == cpu_present. | |
1206 | * - Ashok Raj | |
1207 | * | |
1208 | * Three ways to find out the number of additional hotplug CPUs: | |
1209 | * - If the BIOS specified disabled CPUs in ACPI/mptables use that. | |
3b11ce7f | 1210 | * - The user can overwrite it with possible_cpus=NUM |
68a1c3f8 GC |
1211 | * - Otherwise don't reserve additional CPUs. |
1212 | * We do this because additional CPUs waste a lot of memory. | |
1213 | * -AK | |
1214 | */ | |
1215 | __init void prefill_possible_map(void) | |
1216 | { | |
cb48bb59 | 1217 | int i, possible; |
68a1c3f8 | 1218 | |
329513a3 YL |
1219 | /* no processor from mptable or madt */ |
1220 | if (!num_processors) | |
1221 | num_processors = 1; | |
1222 | ||
5f2eb550 JB |
1223 | i = setup_max_cpus ?: 1; |
1224 | if (setup_possible_cpus == -1) { | |
1225 | possible = num_processors; | |
1226 | #ifdef CONFIG_HOTPLUG_CPU | |
1227 | if (setup_max_cpus) | |
1228 | possible += disabled_cpus; | |
1229 | #else | |
1230 | if (possible > i) | |
1231 | possible = i; | |
1232 | #endif | |
1233 | } else | |
3b11ce7f MT |
1234 | possible = setup_possible_cpus; |
1235 | ||
730cf272 MT |
1236 | total_cpus = max_t(int, possible, num_processors + disabled_cpus); |
1237 | ||
2b633e3f YL |
1238 | /* nr_cpu_ids could be reduced via nr_cpus= */ |
1239 | if (possible > nr_cpu_ids) { | |
c767a54b | 1240 | pr_warn("%d Processors exceeds NR_CPUS limit of %d\n", |
2b633e3f YL |
1241 | possible, nr_cpu_ids); |
1242 | possible = nr_cpu_ids; | |
3b11ce7f | 1243 | } |
68a1c3f8 | 1244 | |
5f2eb550 JB |
1245 | #ifdef CONFIG_HOTPLUG_CPU |
1246 | if (!setup_max_cpus) | |
1247 | #endif | |
1248 | if (possible > i) { | |
c767a54b | 1249 | pr_warn("%d Processors exceeds max_cpus limit of %u\n", |
5f2eb550 JB |
1250 | possible, setup_max_cpus); |
1251 | possible = i; | |
1252 | } | |
1253 | ||
c767a54b | 1254 | pr_info("Allowing %d CPUs, %d hotplug CPUs\n", |
68a1c3f8 GC |
1255 | possible, max_t(int, possible - num_processors, 0)); |
1256 | ||
1257 | for (i = 0; i < possible; i++) | |
c2d1cec1 | 1258 | set_cpu_possible(i, true); |
5f2eb550 JB |
1259 | for (; i < NR_CPUS; i++) |
1260 | set_cpu_possible(i, false); | |
3461b0af MT |
1261 | |
1262 | nr_cpu_ids = possible; | |
68a1c3f8 | 1263 | } |
69c18c15 | 1264 | |
14adf855 CE |
1265 | #ifdef CONFIG_HOTPLUG_CPU |
1266 | ||
1267 | static void remove_siblinginfo(int cpu) | |
1268 | { | |
1269 | int sibling; | |
1270 | struct cpuinfo_x86 *c = &cpu_data(cpu); | |
1271 | ||
c2d1cec1 MT |
1272 | for_each_cpu(sibling, cpu_core_mask(cpu)) { |
1273 | cpumask_clear_cpu(cpu, cpu_core_mask(sibling)); | |
14adf855 CE |
1274 | /*/ |
1275 | * last thread sibling in this cpu core going down | |
1276 | */ | |
c2d1cec1 | 1277 | if (cpumask_weight(cpu_sibling_mask(cpu)) == 1) |
14adf855 CE |
1278 | cpu_data(sibling).booted_cores--; |
1279 | } | |
1280 | ||
c2d1cec1 MT |
1281 | for_each_cpu(sibling, cpu_sibling_mask(cpu)) |
1282 | cpumask_clear_cpu(cpu, cpu_sibling_mask(sibling)); | |
1283 | cpumask_clear(cpu_sibling_mask(cpu)); | |
1284 | cpumask_clear(cpu_core_mask(cpu)); | |
14adf855 CE |
1285 | c->phys_proc_id = 0; |
1286 | c->cpu_core_id = 0; | |
c2d1cec1 | 1287 | cpumask_clear_cpu(cpu, cpu_sibling_setup_mask); |
14adf855 CE |
1288 | } |
1289 | ||
69c18c15 GC |
1290 | static void __ref remove_cpu_from_maps(int cpu) |
1291 | { | |
c2d1cec1 MT |
1292 | set_cpu_online(cpu, false); |
1293 | cpumask_clear_cpu(cpu, cpu_callout_mask); | |
1294 | cpumask_clear_cpu(cpu, cpu_callin_mask); | |
69c18c15 | 1295 | /* was set by cpu_init() */ |
c2d1cec1 | 1296 | cpumask_clear_cpu(cpu, cpu_initialized_mask); |
23ca4bba | 1297 | numa_remove_cpu(cpu); |
69c18c15 GC |
1298 | } |
1299 | ||
8227dce7 | 1300 | void cpu_disable_common(void) |
69c18c15 GC |
1301 | { |
1302 | int cpu = smp_processor_id(); | |
69c18c15 | 1303 | |
69c18c15 GC |
1304 | remove_siblinginfo(cpu); |
1305 | ||
1306 | /* It's now safe to remove this processor from the online map */ | |
d388e5fd | 1307 | lock_vector_lock(); |
69c18c15 | 1308 | remove_cpu_from_maps(cpu); |
d388e5fd | 1309 | unlock_vector_lock(); |
d7b381bb | 1310 | fixup_irqs(); |
8227dce7 AN |
1311 | } |
1312 | ||
1313 | int native_cpu_disable(void) | |
1314 | { | |
da6139e4 PB |
1315 | int ret; |
1316 | ||
1317 | ret = check_irq_vectors_for_cpu_disable(); | |
1318 | if (ret) | |
1319 | return ret; | |
1320 | ||
8227dce7 AN |
1321 | clear_local_APIC(); |
1322 | ||
1323 | cpu_disable_common(); | |
69c18c15 GC |
1324 | return 0; |
1325 | } | |
1326 | ||
93be71b6 | 1327 | void native_cpu_die(unsigned int cpu) |
69c18c15 GC |
1328 | { |
1329 | /* We don't do anything here: idle task is faking death itself. */ | |
1330 | unsigned int i; | |
1331 | ||
1332 | for (i = 0; i < 10; i++) { | |
1333 | /* They ack this in play_dead by setting CPU_DEAD */ | |
1334 | if (per_cpu(cpu_state, cpu) == CPU_DEAD) { | |
2eaad1fd MT |
1335 | if (system_state == SYSTEM_RUNNING) |
1336 | pr_info("CPU %u is now offline\n", cpu); | |
69c18c15 GC |
1337 | return; |
1338 | } | |
1339 | msleep(100); | |
1340 | } | |
2eaad1fd | 1341 | pr_err("CPU %u didn't die...\n", cpu); |
69c18c15 | 1342 | } |
a21f5d88 AN |
1343 | |
1344 | void play_dead_common(void) | |
1345 | { | |
1346 | idle_task_exit(); | |
1347 | reset_lazy_tlbstate(); | |
02c68a02 | 1348 | amd_e400_remove_cpu(raw_smp_processor_id()); |
a21f5d88 AN |
1349 | |
1350 | mb(); | |
1351 | /* Ack it */ | |
0a3aee0d | 1352 | __this_cpu_write(cpu_state, CPU_DEAD); |
a21f5d88 AN |
1353 | |
1354 | /* | |
1355 | * With physical CPU hotplug, we should halt the cpu | |
1356 | */ | |
1357 | local_irq_disable(); | |
1358 | } | |
1359 | ||
e1c467e6 FY |
1360 | static bool wakeup_cpu0(void) |
1361 | { | |
1362 | if (smp_processor_id() == 0 && enable_start_cpu0) | |
1363 | return true; | |
1364 | ||
1365 | return false; | |
1366 | } | |
1367 | ||
ea530692 PA |
1368 | /* |
1369 | * We need to flush the caches before going to sleep, lest we have | |
1370 | * dirty data in our caches when we come back up. | |
1371 | */ | |
1372 | static inline void mwait_play_dead(void) | |
1373 | { | |
1374 | unsigned int eax, ebx, ecx, edx; | |
1375 | unsigned int highest_cstate = 0; | |
1376 | unsigned int highest_subcstate = 0; | |
ce5f6824 | 1377 | void *mwait_ptr; |
576cfb40 | 1378 | int i; |
ea530692 | 1379 | |
69fb3676 | 1380 | if (!this_cpu_has(X86_FEATURE_MWAIT)) |
ea530692 | 1381 | return; |
840d2830 | 1382 | if (!this_cpu_has(X86_FEATURE_CLFLUSH)) |
ce5f6824 | 1383 | return; |
7b543a53 | 1384 | if (__this_cpu_read(cpu_info.cpuid_level) < CPUID_MWAIT_LEAF) |
ea530692 PA |
1385 | return; |
1386 | ||
1387 | eax = CPUID_MWAIT_LEAF; | |
1388 | ecx = 0; | |
1389 | native_cpuid(&eax, &ebx, &ecx, &edx); | |
1390 | ||
1391 | /* | |
1392 | * eax will be 0 if EDX enumeration is not valid. | |
1393 | * Initialized below to cstate, sub_cstate value when EDX is valid. | |
1394 | */ | |
1395 | if (!(ecx & CPUID5_ECX_EXTENSIONS_SUPPORTED)) { | |
1396 | eax = 0; | |
1397 | } else { | |
1398 | edx >>= MWAIT_SUBSTATE_SIZE; | |
1399 | for (i = 0; i < 7 && edx; i++, edx >>= MWAIT_SUBSTATE_SIZE) { | |
1400 | if (edx & MWAIT_SUBSTATE_MASK) { | |
1401 | highest_cstate = i; | |
1402 | highest_subcstate = edx & MWAIT_SUBSTATE_MASK; | |
1403 | } | |
1404 | } | |
1405 | eax = (highest_cstate << MWAIT_SUBSTATE_SIZE) | | |
1406 | (highest_subcstate - 1); | |
1407 | } | |
1408 | ||
ce5f6824 PA |
1409 | /* |
1410 | * This should be a memory location in a cache line which is | |
1411 | * unlikely to be touched by other processors. The actual | |
1412 | * content is immaterial as it is not actually modified in any way. | |
1413 | */ | |
1414 | mwait_ptr = ¤t_thread_info()->flags; | |
1415 | ||
a68e5c94 PA |
1416 | wbinvd(); |
1417 | ||
ea530692 | 1418 | while (1) { |
ce5f6824 PA |
1419 | /* |
1420 | * The CLFLUSH is a workaround for erratum AAI65 for | |
1421 | * the Xeon 7400 series. It's not clear it is actually | |
1422 | * needed, but it should be harmless in either case. | |
1423 | * The WBINVD is insufficient due to the spurious-wakeup | |
1424 | * case where we return around the loop. | |
1425 | */ | |
7d590cca | 1426 | mb(); |
ce5f6824 | 1427 | clflush(mwait_ptr); |
7d590cca | 1428 | mb(); |
ce5f6824 | 1429 | __monitor(mwait_ptr, 0, 0); |
ea530692 PA |
1430 | mb(); |
1431 | __mwait(eax, 0); | |
e1c467e6 FY |
1432 | /* |
1433 | * If NMI wants to wake up CPU0, start CPU0. | |
1434 | */ | |
1435 | if (wakeup_cpu0()) | |
1436 | start_cpu0(); | |
ea530692 PA |
1437 | } |
1438 | } | |
1439 | ||
1440 | static inline void hlt_play_dead(void) | |
1441 | { | |
7b543a53 | 1442 | if (__this_cpu_read(cpu_info.x86) >= 4) |
a68e5c94 PA |
1443 | wbinvd(); |
1444 | ||
ea530692 | 1445 | while (1) { |
ea530692 | 1446 | native_halt(); |
e1c467e6 FY |
1447 | /* |
1448 | * If NMI wants to wake up CPU0, start CPU0. | |
1449 | */ | |
1450 | if (wakeup_cpu0()) | |
1451 | start_cpu0(); | |
ea530692 PA |
1452 | } |
1453 | } | |
1454 | ||
a21f5d88 AN |
1455 | void native_play_dead(void) |
1456 | { | |
1457 | play_dead_common(); | |
86886e55 | 1458 | tboot_shutdown(TB_SHUTDOWN_WFS); |
ea530692 PA |
1459 | |
1460 | mwait_play_dead(); /* Only returns on failure */ | |
1a022e3f BO |
1461 | if (cpuidle_play_dead()) |
1462 | hlt_play_dead(); | |
a21f5d88 AN |
1463 | } |
1464 | ||
69c18c15 | 1465 | #else /* ... !CONFIG_HOTPLUG_CPU */ |
93be71b6 | 1466 | int native_cpu_disable(void) |
69c18c15 GC |
1467 | { |
1468 | return -ENOSYS; | |
1469 | } | |
1470 | ||
93be71b6 | 1471 | void native_cpu_die(unsigned int cpu) |
69c18c15 GC |
1472 | { |
1473 | /* We said "no" in __cpu_disable */ | |
1474 | BUG(); | |
1475 | } | |
a21f5d88 AN |
1476 | |
1477 | void native_play_dead(void) | |
1478 | { | |
1479 | BUG(); | |
1480 | } | |
1481 | ||
68a1c3f8 | 1482 | #endif |