blob: a32da804252e374b5d266e6788653f24fc98705d [file] [log] [blame]
Joe Perchesc767a542012-05-21 19:50:07 -07001 /*
Glauber de Oliveira Costa4cedb332008-03-19 14:26:14 -03002 * x86 SMP booting functions
3 *
Alan Cox87c6fe22009-01-05 14:08:04 +00004 * (c) 1995 Alan Cox, Building #3 <alan@lxorguk.ukuu.org.uk>
Ingo Molnar8f47e162009-01-31 02:03:42 +01005 * (c) 1998, 1999, 2000, 2009 Ingo Molnar <mingo@redhat.com>
Glauber de Oliveira Costa4cedb332008-03-19 14:26:14 -03006 * 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
Joe Perchesc767a542012-05-21 19:50:07 -070042#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
43
Glauber Costa68a1c3f2008-03-03 14:12:42 -030044#include <linux/init.h>
45#include <linux/smp.h>
Glauber Costaa3553522008-03-03 14:12:58 -030046#include <linux/module.h>
Glauber Costa70708a12008-03-03 14:13:03 -030047#include <linux/sched.h>
Glauber Costa69c18c12008-03-03 14:13:07 -030048#include <linux/percpu.h>
Glauber Costa91718e82008-03-03 14:13:12 -030049#include <linux/bootmem.h>
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -030050#include <linux/err.h>
51#include <linux/nmi.h>
Shane Wang69575d32009-09-01 18:25:07 -070052#include <linux/tboot.h>
Jacob Pan35f720c2009-09-17 07:36:43 -070053#include <linux/stackprotector.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090054#include <linux/gfp.h>
Boris Ostrovsky1a022e32012-03-13 19:55:09 +010055#include <linux/cpuidle.h>
Glauber Costa69c18c12008-03-03 14:13:07 -030056
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -030057#include <asm/acpi.h>
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -030058#include <asm/desc.h>
Glauber Costa69c18c12008-03-03 14:13:07 -030059#include <asm/nmi.h>
60#include <asm/irq.h>
Ingo Molnar07bbc162008-09-23 23:26:42 +020061#include <asm/idle.h>
Jarkko Sakkinen48927bb2012-05-08 21:22:28 +030062#include <asm/realmode.h>
Glauber Costa69c18c12008-03-03 14:13:07 -030063#include <asm/cpu.h>
64#include <asm/numa.h>
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -030065#include <asm/pgtable.h>
66#include <asm/tlbflush.h>
67#include <asm/mtrr.h>
H. Peter Anvinea530692010-09-17 15:39:11 -070068#include <asm/mwait.h>
Ingo Molnar7b6aa332009-02-17 13:58:15 +010069#include <asm/apic.h>
Henrik Kretzschmar7167d082011-02-22 15:38:05 +010070#include <asm/io_apic.h>
Vincent Palatin644c1542012-11-30 12:15:32 -080071#include <asm/i387.h>
72#include <asm/fpu-internal.h>
Yinghai Lu569712b2008-11-16 03:12:49 -080073#include <asm/setup.h>
Tejun Heobdbcdd42009-01-21 17:26:06 +090074#include <asm/uv/uv.h>
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -030075#include <linux/mc146818rtc.h>
Ingo Molnar1164dd02009-01-28 19:34:09 +010076#include <asm/smpboot_hooks.h>
Jacob Panb81bb372009-11-09 11:27:04 -080077#include <asm/i8259.h>
Jarkko Sakkinen48927bb2012-05-08 21:22:28 +030078#include <asm/realmode.h>
Borislav Petkov646e29a2013-09-27 16:35:54 +020079#include <asm/misc.h>
Jarkko Sakkinen48927bb2012-05-08 21:22:28 +030080
Glauber de Oliveira Costaa8db8452008-03-19 14:26:01 -030081/* State of each CPU */
82DEFINE_PER_CPU(int, cpu_state) = { 0 };
83
Glauber Costaa3553522008-03-03 14:12:58 -030084/* Number of siblings per CPU package */
85int smp_num_siblings = 1;
86EXPORT_SYMBOL(smp_num_siblings);
87
88/* Last level cache ID of each logical CPU */
Vlad Zolotarov0816b0f2012-06-11 12:56:52 +030089DEFINE_PER_CPU_READ_MOSTLY(u16, cpu_llc_id) = BAD_APICID;
Glauber Costaa3553522008-03-03 14:12:58 -030090
Glauber Costaa3553522008-03-03 14:12:58 -030091/* representing HT siblings of each logical CPU */
Vlad Zolotarov0816b0f2012-06-11 12:56:52 +030092DEFINE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_sibling_map);
Glauber Costaa3553522008-03-03 14:12:58 -030093EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
94
95/* representing HT and core siblings of each logical CPU */
Vlad Zolotarov0816b0f2012-06-11 12:56:52 +030096DEFINE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_core_map);
Glauber Costaa3553522008-03-03 14:12:58 -030097EXPORT_PER_CPU_SYMBOL(cpu_core_map);
98
Vlad Zolotarov0816b0f2012-06-11 12:56:52 +030099DEFINE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_llc_shared_map);
Yinghai Lub3d73362011-01-21 15:29:44 -0800100
Glauber Costaa3553522008-03-03 14:12:58 -0300101/* Per CPU bogomips and other parameters */
102DEFINE_PER_CPU_SHARED_ALIGNED(struct cpuinfo_x86, cpu_info);
103EXPORT_PER_CPU_SYMBOL(cpu_info);
Glauber Costa768d9502008-03-03 14:13:02 -0300104
Yinghai Lu2b6163b2009-02-25 20:50:49 -0800105atomic_t init_deasserted;
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300106
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300107/*
Fenghua Yu30106c12012-11-13 11:32:41 -0800108 * Report back to the Boot Processor during boot time or to the caller processor
109 * during CPU online.
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300110 */
Paul Gortmaker148f9bb2013-06-18 18:23:59 -0400111static void smp_callin(void)
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300112{
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.
Fenghua Yue1c467e2012-11-14 04:36:53 -0800121 *
122 * Since CPU0 is not wakened up by INIT, it doesn't wait for the IPI.
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300123 */
Fenghua Yue1c467e2012-11-14 04:36:53 -0800124 cpuid = smp_processor_id();
125 if (apic->wait_for_init_deassert && cpuid != 0)
Ingo Molnara9659362009-01-28 16:21:32 +0100126 apic->wait_for_init_deassert(&init_deasserted);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300127
128 /*
129 * (This works even if the APIC is not enabled.)
130 */
Yinghai Lu4c9961d2008-07-11 18:44:16 -0700131 phys_id = read_apic_id();
Mike Travisc2d1cec2009-01-04 05:18:03 -0800132 if (cpumask_test_cpu(cpuid, cpu_callin_mask)) {
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300133 panic("%s: phys CPU#%d, CPU#%d already present??\n", __func__,
134 phys_id, cpuid);
135 }
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200136 pr_debug("CPU#%d (phys ID: %d) waiting for CALLOUT\n", cpuid, phys_id);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300137
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 */
Mike Travisc2d1cec2009-01-04 05:18:03 -0800154 if (cpumask_test_cpu(cpuid, cpu_callout_mask))
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300155 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
Joe Perchesc767a542012-05-21 19:50:07 -0700171 pr_debug("CALLIN, before setup_local_APIC()\n");
Ingo Molnar333344d2009-01-28 16:31:52 +0100172 if (apic->smp_callin_clear_local_apic)
173 apic->smp_callin_clear_local_apic();
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300174 setup_local_APIC();
175 end_local_APIC_setup();
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300176
Suresh Siddha9d133e52010-01-29 11:42:21 -0800177 /*
178 * Need to setup vector mappings before we enable interrupts.
179 */
Suresh Siddha36e9e1e2010-03-15 14:33:06 -0800180 setup_vector_irq(smp_processor_id());
Jack Steinerb5652012011-11-15 15:33:56 -0800181
182 /*
183 * Save our processor parameters. Note: this information
184 * is needed for clock calibration.
185 */
186 smp_store_cpu_info(cpuid);
187
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300188 /*
189 * Get our bogomips.
Jack Steinerb5652012011-11-15 15:33:56 -0800190 * 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.
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300193 */
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300194 calibrate_delay();
Jack Steinerb5652012011-11-15 15:33:56 -0800195 cpu_data(cpuid).loops_per_jiffy = loops_per_jiffy;
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200196 pr_debug("Stack at about %p\n", &cpuid);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300197
198 /*
Andi Kleen5ef428c2010-11-18 11:47:31 +0100199 * 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
Peter Zijlstra85257022010-03-23 19:30:52 +0100205 notify_cpu_starting(cpuid);
206
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300207 /*
208 * Allow the master to continue.
209 */
Mike Travisc2d1cec2009-01-04 05:18:03 -0800210 cpumask_set_cpu(cpuid, cpu_callin_mask);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300211}
212
Fenghua Yue1c467e2012-11-14 04:36:53 -0800213static int cpu0_logical_apicid;
214static int enable_start_cpu0;
Glauber de Oliveira Costabbc2ff62008-03-19 14:26:00 -0300215/*
216 * Activate a secondary processor.
217 */
Paul Gortmaker148f9bb2013-06-18 18:23:59 -0400218static void notrace start_secondary(void *unused)
Glauber de Oliveira Costabbc2ff62008-03-19 14:26:00 -0300219{
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 */
Glauber de Oliveira Costabbc2ff62008-03-19 14:26:00 -0300225 cpu_init();
Igor Mammedovdf156f92012-02-07 15:52:44 +0100226 x86_cpuinit.early_percpu_clock_init();
Glauber de Oliveira Costabbc2ff62008-03-19 14:26:00 -0300227 preempt_disable();
228 smp_callin();
229
Fenghua Yue1c467e2012-11-14 04:36:53 -0800230 enable_start_cpu0 = 0;
231
Borislav Petkovb40827fa2010-08-28 15:58:33 +0200232#ifdef CONFIG_X86_32
233 /* switch away from the initial page table */
234 load_cr3(swapper_pg_dir);
235 __flush_tlb_all();
236#endif
237
Glauber de Oliveira Costabbc2ff62008-03-19 14:26:00 -0300238 /* 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
Glauber de Oliveira Costabbc2ff62008-03-19 14:26:00 -0300245 /*
Eric W. Biedermand388e5f2008-08-09 15:09:02 -0700246 * 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.
Glauber de Oliveira Costabbc2ff62008-03-19 14:26:00 -0300249 */
Eric W. Biedermand388e5f2008-08-09 15:09:02 -0700250 lock_vector_lock();
Mike Travisc2d1cec2009-01-04 05:18:03 -0800251 set_cpu_online(smp_processor_id(), true);
Eric W. Biedermand388e5f2008-08-09 15:09:02 -0700252 unlock_vector_lock();
Glauber de Oliveira Costabbc2ff62008-03-19 14:26:00 -0300253 per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE;
Russ Anderson78c06172010-02-26 10:49:12 -0600254 x86_platform.nmi_init();
Glauber de Oliveira Costabbc2ff62008-03-19 14:26:00 -0300255
Manfred Spraul0cefa5b2008-09-07 11:29:58 +0200256 /* enable local interrupts */
257 local_irq_enable();
258
Jacob Pan35f720c2009-09-17 07:36:43 -0700259 /* to prevent fake stack check failure in clock setup */
260 boot_init_stack_canary();
261
Thomas Gleixner736deca2009-08-19 12:35:53 +0200262 x86_cpuinit.setup_percpu_clockev();
Glauber de Oliveira Costabbc2ff62008-03-19 14:26:00 -0300263
264 wmb();
Thomas Gleixner7d1a9412013-03-21 22:50:03 +0100265 cpu_startup_entry(CPUHP_ONLINE);
Glauber de Oliveira Costabbc2ff62008-03-19 14:26:00 -0300266}
267
Fenghua Yu30106c12012-11-13 11:32:41 -0800268void __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
Glauber de Oliveira Costa1d89a7f2008-03-19 14:25:05 -0300277/*
278 * The bootstrap kernel entry code has set these up. Save them for
279 * a given CPU
280 */
Paul Gortmaker148f9bb2013-06-18 18:23:59 -0400281void smp_store_cpu_info(int id)
Glauber de Oliveira Costa1d89a7f2008-03-19 14:25:05 -0300282{
283 struct cpuinfo_x86 *c = &cpu_data(id);
284
Yinghai Lub3d73362011-01-21 15:29:44 -0800285 *c = boot_cpu_data;
Glauber de Oliveira Costa1d89a7f2008-03-19 14:25:05 -0300286 c->cpu_index = id;
Fenghua Yu30106c12012-11-13 11:32:41 -0800287 /*
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);
Glauber de Oliveira Costa1d89a7f2008-03-19 14:25:05 -0300292}
293
Paul Gortmaker148f9bb2013-06-18 18:23:59 -0400294static bool
Peter Zijlstra316ad242012-05-11 13:05:59 +0200295topology_sane(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o, const char *name)
Andreas Herrmannd4fbe4f2010-09-30 14:41:56 +0200296{
Peter Zijlstra316ad242012-05-11 13:05:59 +0200297 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));
Andreas Herrmannd4fbe4f2010-09-30 14:41:56 +0200303}
304
Peter Zijlstra316ad242012-05-11 13:05:59 +0200305#define link_mask(_m, c1, c2) \
306do { \
307 cpumask_set_cpu((c1), cpu_##_m##_mask(c2)); \
308 cpumask_set_cpu((c2), cpu_##_m##_mask(c1)); \
309} while (0)
310
Paul Gortmaker148f9bb2013-06-18 18:23:59 -0400311static bool match_smt(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o)
Peter Zijlstra316ad242012-05-11 13:05:59 +0200312{
Andreas Herrmann193f3fc2012-10-19 10:58:13 +0200313 if (cpu_has_topoext) {
Peter Zijlstra316ad242012-05-11 13:05:59 +0200314 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
Paul Gortmaker148f9bb2013-06-18 18:23:59 -0400329static bool match_llc(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o)
Peter Zijlstra316ad242012-05-11 13:05:59 +0200330{
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;
338}
339
Paul Gortmaker148f9bb2013-06-18 18:23:59 -0400340static bool match_mc(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o)
Peter Zijlstra316ad242012-05-11 13:05:59 +0200341{
Borislav Petkov161270f2012-06-06 17:31:26 +0200342 if (c->phys_proc_id == o->phys_proc_id) {
343 if (cpu_has(c, X86_FEATURE_AMD_DCM))
344 return true;
Peter Zijlstra316ad242012-05-11 13:05:59 +0200345
Borislav Petkov161270f2012-06-06 17:31:26 +0200346 return topology_sane(c, o, "mc");
347 }
Peter Zijlstra316ad242012-05-11 13:05:59 +0200348 return false;
349}
Glauber de Oliveira Costa1d89a7f2008-03-19 14:25:05 -0300350
Paul Gortmaker148f9bb2013-06-18 18:23:59 -0400351void set_cpu_sibling_map(int cpu)
Glauber Costa768d9502008-03-03 14:13:02 -0300352{
Peter Zijlstra316ad242012-05-11 13:05:59 +0200353 bool has_smt = smp_num_siblings > 1;
Andrew Jonesb0bc2252013-05-29 14:48:15 +0200354 bool has_mp = has_smt || boot_cpu_data.x86_max_cores > 1;
Glauber Costa768d9502008-03-03 14:13:02 -0300355 struct cpuinfo_x86 *c = &cpu_data(cpu);
Peter Zijlstra316ad242012-05-11 13:05:59 +0200356 struct cpuinfo_x86 *o;
357 int i;
Glauber Costa768d9502008-03-03 14:13:02 -0300358
Mike Travisc2d1cec2009-01-04 05:18:03 -0800359 cpumask_set_cpu(cpu, cpu_sibling_setup_mask);
Glauber Costa768d9502008-03-03 14:13:02 -0300360
Andrew Jonesb0bc2252013-05-29 14:48:15 +0200361 if (!has_mp) {
Mike Travisc2d1cec2009-01-04 05:18:03 -0800362 cpumask_set_cpu(cpu, cpu_sibling_mask(cpu));
Peter Zijlstra316ad242012-05-11 13:05:59 +0200363 cpumask_set_cpu(cpu, cpu_llc_shared_mask(cpu));
364 cpumask_set_cpu(cpu, cpu_core_mask(cpu));
Glauber Costa768d9502008-03-03 14:13:02 -0300365 c->booted_cores = 1;
366 return;
367 }
368
Mike Travisc2d1cec2009-01-04 05:18:03 -0800369 for_each_cpu(i, cpu_sibling_setup_mask) {
Peter Zijlstra316ad242012-05-11 13:05:59 +0200370 o = &cpu_data(i);
Peter Zijlstra0acbb442012-04-18 19:04:09 +0200371
Peter Zijlstra316ad242012-05-11 13:05:59 +0200372 if ((i == cpu) || (has_smt && match_smt(c, o)))
373 link_mask(sibling, cpu, i);
Peter Zijlstra0acbb442012-04-18 19:04:09 +0200374
Andrew Jonesb0bc2252013-05-29 14:48:15 +0200375 if ((i == cpu) || (has_mp && match_llc(c, o)))
Peter Zijlstra316ad242012-05-11 13:05:59 +0200376 link_mask(llc_shared, cpu, i);
377
Kamalesh Babulalceb1cba2012-05-31 13:07:38 +0530378 }
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
Andrew Jonesb0bc2252013-05-29 14:48:15 +0200387 if ((i == cpu) || (has_mp && match_mc(c, o))) {
Peter Zijlstra316ad242012-05-11 13:05:59 +0200388 link_mask(core, cpu, i);
389
Glauber Costa768d9502008-03-03 14:13:02 -0300390 /*
391 * Does this new cpu bringup a new core?
392 */
Mike Travisc2d1cec2009-01-04 05:18:03 -0800393 if (cpumask_weight(cpu_sibling_mask(cpu)) == 1) {
Glauber Costa768d9502008-03-03 14:13:02 -0300394 /*
395 * for each core in package, increment
396 * the booted_cores for this new cpu
397 */
Mike Travisc2d1cec2009-01-04 05:18:03 -0800398 if (cpumask_first(cpu_sibling_mask(i)) == i)
Glauber Costa768d9502008-03-03 14:13:02 -0300399 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
Glauber Costa70708a12008-03-03 14:13:03 -0300412/* maps the cpu to the sched domain representing multi-core */
Rusty Russell030bb202008-12-26 22:23:41 +1030413const struct cpumask *cpu_coregroup_mask(int cpu)
Glauber Costa70708a12008-03-03 14:13:03 -0300414{
Peter Zijlstra9f646382012-05-29 16:39:09 +0200415 return cpu_llc_shared_mask(cpu);
Rusty Russell030bb202008-12-26 22:23:41 +1030416}
417
Ingo Molnara4928cf2008-04-23 13:20:56 +0200418static void impress_friends(void)
Glauber de Oliveira Costa904541e2008-03-19 14:25:27 -0300419{
420 int cpu;
421 unsigned long bogosum = 0;
422 /*
423 * Allow the user to impress friends.
424 */
Joe Perchesc767a542012-05-21 19:50:07 -0700425 pr_debug("Before bogomips\n");
Glauber de Oliveira Costa904541e2008-03-19 14:25:27 -0300426 for_each_possible_cpu(cpu)
Mike Travisc2d1cec2009-01-04 05:18:03 -0800427 if (cpumask_test_cpu(cpu, cpu_callout_mask))
Glauber de Oliveira Costa904541e2008-03-19 14:25:27 -0300428 bogosum += cpu_data(cpu).loops_per_jiffy;
Joe Perchesc767a542012-05-21 19:50:07 -0700429 pr_info("Total of %d processors activated (%lu.%02lu BogoMIPS)\n",
Glauber de Oliveira Costaf68e00a2008-03-19 14:25:29 -0300430 num_online_cpus(),
Glauber de Oliveira Costa904541e2008-03-19 14:25:27 -0300431 bogosum/(500000/HZ),
432 (bogosum/(5000/HZ))%100);
433
Joe Perchesc767a542012-05-21 19:50:07 -0700434 pr_debug("Before bogocount - setting activated=1\n");
Glauber de Oliveira Costa904541e2008-03-19 14:25:27 -0300435}
436
Yinghai Lu569712b2008-11-16 03:12:49 -0800437void __inquire_remote_apic(int apicid)
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300438{
439 unsigned i, regs[] = { APIC_ID >> 4, APIC_LVR >> 4, APIC_SPIV >> 4 };
Greg Dietschea6c239052011-06-30 20:10:53 -0500440 const char * const names[] = { "ID", "VERSION", "SPIV" };
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300441 int timeout;
442 u32 status;
443
Joe Perchesc767a542012-05-21 19:50:07 -0700444 pr_info("Inquiring remote APIC 0x%x...\n", apicid);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300445
446 for (i = 0; i < ARRAY_SIZE(regs); i++) {
Joe Perchesc767a542012-05-21 19:50:07 -0700447 pr_info("... APIC 0x%x %s: ", apicid, names[i]);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300448
449 /*
450 * Wait for idle.
451 */
452 status = safe_apic_wait_icr_idle();
453 if (status)
Joe Perchesc767a542012-05-21 19:50:07 -0700454 pr_cont("a previous APIC delivery may have failed\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300455
Suresh Siddha1b374e42008-07-10 11:16:49 -0700456 apic_icr_write(APIC_DM_REMRD | regs[i], apicid);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300457
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);
Joe Perchesc767a542012-05-21 19:50:07 -0700467 pr_cont("%08x\n", status);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300468 break;
469 default:
Joe Perchesc767a542012-05-21 19:50:07 -0700470 pr_cont("failed\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300471 }
472 }
473}
474
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300475/*
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 */
Paul Gortmaker148f9bb2013-06-18 18:23:59 -0400480int
Fenghua Yue1c467e2012-11-14 04:36:53 -0800481wakeup_secondary_cpu_via_nmi(int apicid, unsigned long start_eip)
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300482{
483 unsigned long send_status, accept_status = 0;
484 int maxlvt;
485
486 /* Target chip */
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300487 /* Boot on the stack */
488 /* Kick the second */
Fenghua Yue1c467e2012-11-14 04:36:53 -0800489 apic_icr_write(APIC_DM_NMI | apic->dest_logical, apicid);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300490
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200491 pr_debug("Waiting for send to finish...\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300492 send_status = safe_apic_wait_icr_idle();
493
494 /*
495 * Give the other CPU some time to accept the IPI.
496 */
497 udelay(200);
Yinghai Lu569712b2008-11-16 03:12:49 -0800498 if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) {
Cyrill Gorcunov59ef48a2008-09-14 21:58:49 +0400499 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 }
Joe Perchesc767a542012-05-21 19:50:07 -0700504 pr_debug("NMI sent\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300505
506 if (send_status)
Joe Perchesc767a542012-05-21 19:50:07 -0700507 pr_err("APIC never delivered???\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300508 if (accept_status)
Joe Perchesc767a542012-05-21 19:50:07 -0700509 pr_err("APIC delivery error (%lx)\n", accept_status);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300510
511 return (send_status | accept_status);
512}
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300513
Paul Gortmaker148f9bb2013-06-18 18:23:59 -0400514static int
Yinghai Lu569712b2008-11-16 03:12:49 -0800515wakeup_secondary_cpu_via_init(int phys_apicid, unsigned long start_eip)
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300516{
517 unsigned long send_status, accept_status = 0;
518 int maxlvt, num_starts, j;
519
Maciej W. Rozycki593f4a72008-07-16 19:15:30 +0100520 maxlvt = lapic_get_maxlvt();
521
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300522 /*
523 * Be paranoid about clearing APIC errors.
524 */
525 if (APIC_INTEGRATED(apic_version[phys_apicid])) {
Maciej W. Rozycki593f4a72008-07-16 19:15:30 +0100526 if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */
527 apic_write(APIC_ESR, 0);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300528 apic_read(APIC_ESR);
529 }
530
Joe Perchesc767a542012-05-21 19:50:07 -0700531 pr_debug("Asserting INIT\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300532
533 /*
534 * Turn INIT on target chip
535 */
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300536 /*
537 * Send IPI
538 */
Suresh Siddha1b374e42008-07-10 11:16:49 -0700539 apic_icr_write(APIC_INT_LEVELTRIG | APIC_INT_ASSERT | APIC_DM_INIT,
540 phys_apicid);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300541
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200542 pr_debug("Waiting for send to finish...\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300543 send_status = safe_apic_wait_icr_idle();
544
545 mdelay(10);
546
Joe Perchesc767a542012-05-21 19:50:07 -0700547 pr_debug("Deasserting INIT\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300548
549 /* Target chip */
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300550 /* Send IPI */
Suresh Siddha1b374e42008-07-10 11:16:49 -0700551 apic_icr_write(APIC_INT_LEVELTRIG | APIC_DM_INIT, phys_apicid);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300552
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200553 pr_debug("Waiting for send to finish...\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300554 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,
H. Peter Anvin11d4c3f2011-02-04 16:14:11 -0800575 stack_start);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300576
577 /*
578 * Run STARTUP IPI loop.
579 */
Joe Perchesc767a542012-05-21 19:50:07 -0700580 pr_debug("#startup loops: %d\n", num_starts);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300581
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300582 for (j = 1; j <= num_starts; j++) {
Joe Perchesc767a542012-05-21 19:50:07 -0700583 pr_debug("Sending STARTUP #%d\n", j);
Maciej W. Rozycki593f4a72008-07-16 19:15:30 +0100584 if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */
585 apic_write(APIC_ESR, 0);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300586 apic_read(APIC_ESR);
Joe Perchesc767a542012-05-21 19:50:07 -0700587 pr_debug("After apic_write\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300588
589 /*
590 * STARTUP IPI
591 */
592
593 /* Target chip */
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300594 /* Boot on the stack */
595 /* Kick the second */
Suresh Siddha1b374e42008-07-10 11:16:49 -0700596 apic_icr_write(APIC_DM_STARTUP | (start_eip >> 12),
597 phys_apicid);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300598
599 /*
600 * Give the other CPU some time to accept the IPI.
601 */
602 udelay(300);
603
Joe Perchesc767a542012-05-21 19:50:07 -0700604 pr_debug("Startup point 1\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300605
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200606 pr_debug("Waiting for send to finish...\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300607 send_status = safe_apic_wait_icr_idle();
608
609 /*
610 * Give the other CPU some time to accept the IPI.
611 */
612 udelay(200);
Maciej W. Rozycki593f4a72008-07-16 19:15:30 +0100613 if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300614 apic_write(APIC_ESR, 0);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300615 accept_status = (apic_read(APIC_ESR) & 0xEF);
616 if (send_status || accept_status)
617 break;
618 }
Joe Perchesc767a542012-05-21 19:50:07 -0700619 pr_debug("After Startup\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300620
621 if (send_status)
Joe Perchesc767a542012-05-21 19:50:07 -0700622 pr_err("APIC never delivered???\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300623 if (accept_status)
Joe Perchesc767a542012-05-21 19:50:07 -0700624 pr_err("APIC delivery error (%lx)\n", accept_status);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300625
626 return (send_status | accept_status);
627}
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300628
Borislav Petkova17bce42013-09-30 11:56:24 +0200629void 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
Mike Travis2eaad1f2009-12-10 17:19:36 -0800637/* reduce the number of lines printed when booting a large cpu count system */
Paul Gortmaker148f9bb2013-06-18 18:23:59 -0400638static void announce_cpu(int cpu, int apicid)
Mike Travis2eaad1f2009-12-10 17:19:36 -0800639{
640 static int current_node = -1;
Borislav Petkov4adc8b72010-06-01 21:04:55 +0200641 int node = early_cpu_to_node(cpu);
Borislav Petkova17bce42013-09-30 11:56:24 +0200642 static int width, node_width;
Borislav Petkov646e29a2013-09-27 16:35:54 +0200643
644 if (!width)
645 width = num_digits(num_possible_cpus()) + 1; /* + '#' sign */
Mike Travis2eaad1f2009-12-10 17:19:36 -0800646
Borislav Petkova17bce42013-09-30 11:56:24 +0200647 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
Mike Travis2eaad1f2009-12-10 17:19:36 -0800653 if (system_state == SYSTEM_BOOTING) {
654 if (node != current_node) {
655 if (current_node > (-1))
Borislav Petkova17bce42013-09-30 11:56:24 +0200656 pr_cont("\n");
Mike Travis2eaad1f2009-12-10 17:19:36 -0800657 current_node = node;
Borislav Petkova17bce42013-09-30 11:56:24 +0200658
659 printk(KERN_INFO ".... node %*s#%d, CPUs: ",
660 node_width - num_digits(node), " ", node);
Mike Travis2eaad1f2009-12-10 17:19:36 -0800661 }
Borislav Petkov646e29a2013-09-27 16:35:54 +0200662
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
Mike Travis2eaad1f2009-12-10 17:19:36 -0800669 } else
670 pr_info("Booting Node %d Processor %d APIC 0x%x\n",
671 node, cpu, apicid);
672}
673
Fenghua Yue1c467e2012-11-14 04:36:53 -0800674static 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 */
Paul Gortmaker148f9bb2013-06-18 18:23:59 -0400697static int
Fenghua Yue1c467e2012-11-14 04:36:53 -0800698wakeup_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
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300731/*
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.
Ingo Molnar1f5bcab2009-02-26 13:51:40 +0100734 * Returns zero if CPU booted OK, else error code from
735 * ->wakeup_secondary_cpu.
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300736 */
Paul Gortmaker148f9bb2013-06-18 18:23:59 -0400737static int do_boot_cpu(int apicid, int cpu, struct task_struct *idle)
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300738{
Jarkko Sakkinen48927bb2012-05-08 21:22:28 +0300739 volatile u32 *trampoline_status =
Jarkko Sakkinenb429dbf2012-05-08 21:22:41 +0300740 (volatile u32 *) __va(real_mode_header->trampoline_status);
Jarkko Sakkinen48927bb2012-05-08 21:22:28 +0300741 /* start_ip had better be page-aligned! */
Jarkko Sakkinenf37240f2012-05-08 21:22:43 +0300742 unsigned long start_ip = real_mode_header->trampoline_start;
Jarkko Sakkinen48927bb2012-05-08 21:22:28 +0300743
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300744 unsigned long boot_error = 0;
Ingo Molnarab6fb7c2009-02-17 16:22:09 +0100745 int timeout;
Fenghua Yue1c467e2012-11-14 04:36:53 -0800746 int cpu0_nmi_registered = 0;
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300747
Rusty Russell816afe42012-08-06 17:29:49 +0930748 /* Just in case we booted with a single CPU. */
749 alternatives_enable_smp();
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300750
Thomas Gleixner7eb43a62012-04-20 13:05:48 +0000751 idle->thread.sp = (unsigned long) (((struct pt_regs *)
752 (THREAD_SIZE + task_stack_page(idle))) - 1);
753 per_cpu(current_task, cpu) = idle;
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300754
Brian Gerstc6f5e0a2009-01-19 00:38:58 +0900755#ifdef CONFIG_X86_32
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300756 /* Stack for startup_32 can be just as for start_secondary onwards */
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300757 irq_ctx_init(cpu);
758#else
Thomas Gleixner7eb43a62012-04-20 13:05:48 +0000759 clear_tsk_thread_flag(idle, TIF_FORK);
Tejun Heo004aa322009-01-13 20:41:35 +0900760 initial_gs = per_cpu_offset(cpu);
Brian Gerst9af45652009-01-19 00:38:58 +0900761 per_cpu(kernel_stack, cpu) =
Thomas Gleixner7eb43a62012-04-20 13:05:48 +0000762 (unsigned long)task_stack_page(idle) -
Brian Gerst9af45652009-01-19 00:38:58 +0900763 KERNEL_STACK_OFFSET + THREAD_SIZE;
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300764#endif
Glauber Costaa9390982008-05-28 16:19:53 -0700765 early_gdt_descr.address = (unsigned long)get_cpu_gdt_table(cpu);
Glauber Costa3e970472008-05-28 13:01:54 -0300766 initial_code = (unsigned long)start_secondary;
Thomas Gleixner7eb43a62012-04-20 13:05:48 +0000767 stack_start = idle->thread.sp;
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300768
Mike Travis2eaad1f2009-12-10 17:19:36 -0800769 /* So we see what's up */
770 announce_cpu(cpu, apicid);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300771
772 /*
773 * This grunge runs the startup process for
774 * the targeted processor.
775 */
776
777 atomic_set(&init_deasserted, 0);
778
Jack Steiner34d05592008-04-16 11:45:15 -0500779 if (get_uv_system_type() != UV_NON_UNIQUE_APIC) {
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300780
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200781 pr_debug("Setting warm reset code and vector.\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300782
Jack Steiner34d05592008-04-16 11:45:15 -0500783 smpboot_setup_warm_reset_vector(start_ip);
784 /*
785 * Be paranoid about clearing APIC errors.
Cyrill Gorcunovdb96b0a2008-10-22 18:00:09 +0400786 */
787 if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) {
788 apic_write(APIC_ESR, 0);
789 apic_read(APIC_ESR);
790 }
Jack Steiner34d05592008-04-16 11:45:15 -0500791 }
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300792
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300793 /*
Fenghua Yue1c467e2012-11-14 04:36:53 -0800794 * 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.
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300798 */
Ingo Molnar1f5bcab2009-02-26 13:51:40 +0100799 if (apic->wakeup_secondary_cpu)
800 boot_error = apic->wakeup_secondary_cpu(apicid, start_ip);
801 else
Fenghua Yue1c467e2012-11-14 04:36:53 -0800802 boot_error = wakeup_cpu_via_init_nmi(cpu, start_ip, apicid,
803 &cpu0_nmi_registered);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300804
805 if (!boot_error) {
806 /*
807 * allow APs to start initializing.
808 */
Joe Perchesc767a542012-05-21 19:50:07 -0700809 pr_debug("Before Callout %d\n", cpu);
Mike Travisc2d1cec2009-01-04 05:18:03 -0800810 cpumask_set_cpu(cpu, cpu_callout_mask);
Joe Perchesc767a542012-05-21 19:50:07 -0700811 pr_debug("After Callout %d\n", cpu);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300812
813 /*
814 * Wait 5s total for a response
815 */
816 for (timeout = 0; timeout < 50000; timeout++) {
Mike Travisc2d1cec2009-01-04 05:18:03 -0800817 if (cpumask_test_cpu(cpu, cpu_callin_mask))
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300818 break; /* It has booted */
819 udelay(100);
Suresh Siddha68f202e2010-07-30 11:46:42 -0700820 /*
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();
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300827 }
828
Yinghai Lu21c3fcf2012-02-12 09:53:57 -0800829 if (cpumask_test_cpu(cpu, cpu_callin_mask)) {
830 print_cpu_msr(&cpu_data(cpu));
Mike Travis2eaad1f2009-12-10 17:19:36 -0800831 pr_debug("CPU%d: has booted.\n", cpu);
Yinghai Lu21c3fcf2012-02-12 09:53:57 -0800832 } else {
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300833 boot_error = 1;
Jarkko Sakkinen48927bb2012-05-08 21:22:28 +0300834 if (*trampoline_status == 0xA5A5A5A5)
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300835 /* trampoline started but...? */
Mike Travis2eaad1f2009-12-10 17:19:36 -0800836 pr_err("CPU%d: Stuck ??\n", cpu);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300837 else
838 /* trampoline code not run */
Joe Perchesc767a542012-05-21 19:50:07 -0700839 pr_err("CPU%d: Not responding\n", cpu);
Ingo Molnar25dc0042009-01-28 16:31:52 +0100840 if (apic->inquire_remote_apic)
841 apic->inquire_remote_apic(apicid);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300842 }
843 }
Tejun Heo1a51e3a2009-01-13 20:41:35 +0900844
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300845 if (boot_error) {
846 /* Try to put things back the way they were before ... */
Mike Travis23ca4bb2008-05-12 21:21:12 +0200847 numa_remove_cpu(cpu); /* was set by numa_add_cpu */
Mike Travisc2d1cec2009-01-04 05:18:03 -0800848
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);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300856 per_cpu(x86_cpu_to_apicid, cpu) = BAD_APICID;
857 }
858
859 /* mark "stuck" area as not stuck */
Jarkko Sakkinen48927bb2012-05-08 21:22:28 +0300860 *trampoline_status = 0;
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300861
Yinghai Lu02421f92009-04-03 17:15:53 -0700862 if (get_uv_system_type() != UV_NON_UNIQUE_APIC) {
863 /*
864 * Cleanup possible dangling ends...
865 */
866 smpboot_restore_warm_reset_vector();
867 }
Fenghua Yue1c467e2012-11-14 04:36:53 -0800868 /*
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
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300875 return boot_error;
876}
877
Paul Gortmaker148f9bb2013-06-18 18:23:59 -0400878int native_cpu_up(unsigned int cpu, struct task_struct *tidle)
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300879{
Ingo Molnara21769a42009-01-28 06:50:47 +0100880 int apicid = apic->cpu_present_to_apicid(cpu);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300881 unsigned long flags;
882 int err;
883
884 WARN_ON(irqs_disabled());
885
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200886 pr_debug("++++++++++++++++++++=_---CPU UP %u\n", cpu);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300887
Fenghua Yu30106c12012-11-13 11:32:41 -0800888 if (apicid == BAD_APICID ||
Suresh Siddhac284b422011-12-21 17:45:19 -0800889 !physid_isset(apicid, phys_cpu_present_map) ||
Daniel J Bluemanfa630302012-03-14 15:17:34 +0800890 !apic->apic_id_valid(apicid)) {
Joe Perchesc767a542012-05-21 19:50:07 -0700891 pr_err("%s: bad cpu %d\n", __func__, cpu);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300892 return -EINVAL;
893 }
894
895 /*
896 * Already booted CPU?
897 */
Mike Travisc2d1cec2009-01-04 05:18:03 -0800898 if (cpumask_test_cpu(cpu, cpu_callin_mask)) {
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200899 pr_debug("do_boot_cpu %d Already started\n", cpu);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300900 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
Vincent Palatin644c1542012-11-30 12:15:32 -0800911 /* the FPU context is blank, nobody can own it */
912 __cpu_disable_lazy_restore(cpu);
913
Thomas Gleixner7eb43a62012-04-20 13:05:48 +0000914 err = do_boot_cpu(apicid, cpu, tidle);
Hugh Dickins61165d72008-05-13 14:26:57 +0100915 if (err) {
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200916 pr_debug("do_boot_cpu failed %d\n", err);
Hugh Dickins61165d72008-05-13 14:26:57 +0100917 return -EIO;
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300918 }
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
Akinobu Mita7c04e642008-04-19 23:55:17 +0900928 while (!cpu_online(cpu)) {
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300929 cpu_relax();
930 touch_nmi_watchdog();
931 }
932
933 return 0;
934}
935
Henrik Kretzschmar7167d082011-02-22 15:38:05 +0100936/**
937 * arch_disable_smp_support() - disables SMP support for x86 at runtime
938 */
939void arch_disable_smp_support(void)
940{
941 disable_ioapic_support();
942}
943
Glauber de Oliveira Costaa8db8452008-03-19 14:26:01 -0300944/*
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -0300945 * 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 */
949static __init void disable_smp(void)
950{
Rusty Russell4f062892009-03-13 14:49:54 +1030951 init_cpu_present(cpumask_of(0));
952 init_cpu_possible(cpumask_of(0));
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -0300953 smpboot_clear_io_apic_irqs();
Glauber Costa0f385d12008-05-28 17:09:53 -0700954
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -0300955 if (smp_found_config)
Jack Steinerb6df1b82008-06-19 21:51:05 -0500956 physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map);
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -0300957 else
Jack Steinerb6df1b82008-06-19 21:51:05 -0500958 physid_set_mask_of_physid(0, &phys_cpu_present_map);
Mike Travisc2d1cec2009-01-04 05:18:03 -0800959 cpumask_set_cpu(0, cpu_sibling_mask(0));
960 cpumask_set_cpu(0, cpu_core_mask(0));
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -0300961}
962
963/*
964 * Various sanity checks.
965 */
966static int __init smp_sanity_check(unsigned max_cpus)
967{
Jack Steinerac23d4e2008-03-28 14:12:16 -0500968 preempt_disable();
Yinghai Lua58f03b2008-08-14 02:16:30 -0700969
Yinghai Lu1ff2f202009-01-29 19:30:04 -0800970#if !defined(CONFIG_X86_BIGSMP) && defined(CONFIG_X86_32)
Yinghai Lua58f03b2008-08-14 02:16:30 -0700971 if (def_to_bigsmp && nr_cpu_ids > 8) {
972 unsigned int cpu;
973 unsigned nr;
974
Joe Perchesc767a542012-05-21 19:50:07 -0700975 pr_warn("More than 8 CPUs detected - skipping them\n"
976 "Use CONFIG_X86_BIGSMP\n");
Yinghai Lua58f03b2008-08-14 02:16:30 -0700977
978 nr = 0;
979 for_each_present_cpu(cpu) {
980 if (nr >= 8)
Mike Travisc2d1cec2009-01-04 05:18:03 -0800981 set_cpu_present(cpu, false);
Yinghai Lua58f03b2008-08-14 02:16:30 -0700982 nr++;
983 }
984
985 nr = 0;
986 for_each_possible_cpu(cpu) {
987 if (nr >= 8)
Mike Travisc2d1cec2009-01-04 05:18:03 -0800988 set_cpu_possible(cpu, false);
Yinghai Lua58f03b2008-08-14 02:16:30 -0700989 nr++;
990 }
991
992 nr_cpu_ids = 8;
993 }
994#endif
995
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -0300996 if (!physid_isset(hard_smp_processor_id(), phys_cpu_present_map)) {
Joe Perchesc767a542012-05-21 19:50:07 -0700997 pr_warn("weird, boot CPU (#%d) not listed by the BIOS\n",
Michael Tokarev55c395b2008-12-05 14:42:20 +0300998 hard_smp_processor_id());
999
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001000 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) {
Jack Steinerac23d4e2008-03-28 14:12:16 -05001008 preempt_enable();
Joe Perchesc767a542012-05-21 19:50:07 -07001009 pr_notice("SMP motherboard not detected\n");
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001010 disable_smp();
1011 if (APIC_init_uniprocessor())
Joe Perchesc767a542012-05-21 19:50:07 -07001012 pr_notice("Local APIC not detected. Using dummy APIC emulation.\n");
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001013 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 */
Ingo Molnara27a6212009-01-28 12:43:18 +01001020 if (!apic->check_phys_apicid_present(boot_cpu_physical_apicid)) {
Joe Perchesc767a542012-05-21 19:50:07 -07001021 pr_notice("weird, boot CPU (#%d) not listed by the BIOS\n",
1022 boot_cpu_physical_apicid);
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001023 physid_set(hard_smp_processor_id(), phys_cpu_present_map);
1024 }
Jack Steinerac23d4e2008-03-28 14:12:16 -05001025 preempt_enable();
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001026
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) {
Cyrill Gorcunov103428e2009-06-07 16:48:40 +04001032 if (!disable_apic) {
1033 pr_err("BIOS bug, local APIC #%d not detected!...\n",
1034 boot_cpu_physical_apicid);
Joe Perchesc767a542012-05-21 19:50:07 -07001035 pr_err("... forcing use of dummy APIC emulation (tell your hw vendor)\n");
Cyrill Gorcunov103428e2009-06-07 16:48:40 +04001036 }
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001037 smpboot_clear_io_apic();
Henrik Kretzschmar7167d082011-02-22 15:38:05 +01001038 disable_ioapic_support();
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001039 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) {
Joe Perchesc767a542012-05-21 19:50:07 -07001048 pr_info("SMP mode deactivated\n");
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001049 smpboot_clear_io_apic();
Maciej W. Rozyckid54db1a2008-06-06 03:28:02 +01001050
Jesse Barnese90955c2008-04-21 14:14:44 -07001051 connect_bsp_APIC();
Jesse Barnese90955c2008-04-21 14:14:44 -07001052 setup_local_APIC();
Jan Beulich2fb270f2011-02-09 08:21:02 +00001053 bsp_end_local_APIC_setup();
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001054 return -1;
1055 }
1056
1057 return 0;
1058}
1059
1060static void __init smp_cpu_index_default(void)
1061{
1062 int i;
1063 struct cpuinfo_x86 *c;
1064
Akinobu Mita7c04e642008-04-19 23:55:17 +09001065 for_each_possible_cpu(i) {
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001066 c = &cpu_data(i);
1067 /* mark all to hotplug */
Mike Travis96289372008-12-31 18:08:46 -08001068 c->cpu_index = nr_cpu_ids;
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001069 }
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 */
1076void __init native_smp_prepare_cpus(unsigned int max_cpus)
1077{
Rusty Russell7ad728f2009-03-13 14:49:50 +10301078 unsigned int i;
1079
Ingo Molnardeef3252008-05-12 15:44:38 +02001080 preempt_disable();
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001081 smp_cpu_index_default();
Yinghai Lu792363d2011-01-21 15:29:54 -08001082
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001083 /*
1084 * Setup boot CPU information
1085 */
Fenghua Yu30106c12012-11-13 11:32:41 -08001086 smp_store_boot_cpu_info(); /* Final full version of the data */
Yinghai Lu792363d2011-01-21 15:29:54 -08001087 cpumask_copy(cpu_callin_mask, cpumask_of(0));
1088 mb();
Tejun Heobd22a2f2011-01-23 14:37:27 +01001089
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001090 current_thread_info()->cpu = 0; /* needed? */
Rusty Russell7ad728f2009-03-13 14:49:50 +10301091 for_each_possible_cpu(i) {
Li Zefan79f55992009-06-15 14:58:26 +08001092 zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
1093 zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
Yinghai Lub3d73362011-01-21 15:29:44 -08001094 zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
Rusty Russell7ad728f2009-03-13 14:49:50 +10301095 }
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001096 set_cpu_sibling_map(0);
1097
Suresh Siddha6e1cb382008-07-10 11:16:58 -07001098
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001099 if (smp_sanity_check(max_cpus) < 0) {
Joe Perchesc767a542012-05-21 19:50:07 -07001100 pr_info("SMP disabled\n");
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001101 disable_smp();
Ingo Molnardeef3252008-05-12 15:44:38 +02001102 goto out;
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001103 }
1104
Suresh Siddhafa47f7e2010-08-27 11:09:50 -07001105 default_setup_apic_routing();
1106
Jack Steinerac23d4e2008-03-28 14:12:16 -05001107 preempt_disable();
Yinghai Lu4c9961d2008-07-11 18:44:16 -07001108 if (read_apic_id() != boot_cpu_physical_apicid) {
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001109 panic("Boot APIC ID in local APIC unexpected (%d vs %d)",
Yinghai Lu4c9961d2008-07-11 18:44:16 -07001110 read_apic_id(), boot_cpu_physical_apicid);
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001111 /* Or can we switch back to PIC here? */
1112 }
Jack Steinerac23d4e2008-03-28 14:12:16 -05001113 preempt_enable();
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001114
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001115 connect_bsp_APIC();
Glauber Costab5841762008-05-28 13:38:28 -03001116
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001117 /*
1118 * Switch from PIC to APIC mode.
1119 */
1120 setup_local_APIC();
1121
Fenghua Yue1c467e2012-11-14 04:36:53 -08001122 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
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001127 /*
1128 * Enable IO APIC before setting up error vector
1129 */
1130 if (!skip_ioapic_setup && nr_ioapics)
1131 enable_IO_APIC();
Yinghai Lu88d0f552009-02-14 23:57:28 -08001132
Jan Beulich2fb270f2011-02-09 08:21:02 +00001133 bsp_end_local_APIC_setup();
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001134
Ingo Molnard83093b2009-01-28 12:43:18 +01001135 if (apic->setup_portio_remap)
1136 apic->setup_portio_remap();
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001137
1138 smpboot_setup_io_apic();
1139 /*
1140 * Set up local APIC timer on boot CPU.
1141 */
1142
Joe Perchesc767a542012-05-21 19:50:07 -07001143 pr_info("CPU%d: ", 0);
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001144 print_cpu_info(&cpu_data(0));
Thomas Gleixner736deca2009-08-19 12:35:53 +02001145 x86_init.timers.setup_percpu_clockev();
Marcin Slusarzc4bd1fd2008-08-21 20:49:05 +02001146
1147 if (is_uv_system())
1148 uv_system_init();
Suresh Siddhad0af9ee2009-08-19 18:05:36 -07001149
1150 set_mtrr_aps_delayed_init();
Ingo Molnardeef3252008-05-12 15:44:38 +02001151out:
1152 preempt_enable();
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001153}
Suresh Siddhad0af9ee2009-08-19 18:05:36 -07001154
1155void arch_enable_nonboot_cpus_begin(void)
1156{
1157 set_mtrr_aps_delayed_init();
1158}
1159
1160void arch_enable_nonboot_cpus_end(void)
1161{
1162 mtrr_aps_init();
1163}
1164
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001165/*
Glauber de Oliveira Costaa8db8452008-03-19 14:26:01 -03001166 * Early setup to make printk work.
1167 */
1168void __init native_smp_prepare_boot_cpu(void)
1169{
1170 int me = smp_processor_id();
Brian Gerst552be872009-01-30 17:47:53 +09001171 switch_to_new_gdt(me);
Mike Travisc2d1cec2009-01-04 05:18:03 -08001172 /* already set me in cpu_online_mask in boot_cpu_init() */
1173 cpumask_set_cpu(me, cpu_callout_mask);
Glauber de Oliveira Costaa8db8452008-03-19 14:26:01 -03001174 per_cpu(cpu_state, me) = CPU_ONLINE;
1175}
1176
Glauber de Oliveira Costa83f7eb92008-03-19 14:26:02 -03001177void __init native_smp_cpus_done(unsigned int max_cpus)
1178{
Joe Perchesc767a542012-05-21 19:50:07 -07001179 pr_debug("Boot done\n");
Glauber de Oliveira Costa83f7eb92008-03-19 14:26:02 -03001180
Don Zickus99e8b9c2011-10-13 15:14:26 -04001181 nmi_selftest();
Glauber de Oliveira Costa83f7eb92008-03-19 14:26:02 -03001182 impress_friends();
Glauber de Oliveira Costa83f7eb92008-03-19 14:26:02 -03001183#ifdef CONFIG_X86_IO_APIC
1184 setup_ioapic_dest();
1185#endif
Suresh Siddhad0af9ee2009-08-19 18:05:36 -07001186 mtrr_aps_init();
Glauber de Oliveira Costa83f7eb92008-03-19 14:26:02 -03001187}
1188
Mike Travis3b11ce72008-12-17 15:21:39 -08001189static int __initdata setup_possible_cpus = -1;
1190static int __init _setup_possible_cpus(char *str)
1191{
1192 get_option(&str, &setup_possible_cpus);
1193 return 0;
1194}
1195early_param("possible_cpus", _setup_possible_cpus);
1196
1197
Glauber Costa68a1c3f2008-03-03 14:12:42 -03001198/*
Rusty Russell4f062892009-03-13 14:49:54 +10301199 * cpu_possible_mask should be static, it cannot change as cpu's
Glauber Costa68a1c3f2008-03-03 14:12:42 -03001200 * 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.
Rusty Russell4f062892009-03-13 14:49:54 +10301203 * cpu_present_mask on the other hand can change dynamically.
Glauber Costa68a1c3f2008-03-03 14:12:42 -03001204 * 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.
Mike Travis3b11ce72008-12-17 15:21:39 -08001210 * - The user can overwrite it with possible_cpus=NUM
Glauber Costa68a1c3f2008-03-03 14:12:42 -03001211 * - 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{
Thomas Gleixnercb48bb52008-10-05 17:51:52 +02001217 int i, possible;
Glauber Costa68a1c3f2008-03-03 14:12:42 -03001218
Yinghai Lu329513a2008-07-02 18:54:40 -07001219 /* no processor from mptable or madt */
1220 if (!num_processors)
1221 num_processors = 1;
1222
Jan Beulich5f2eb552010-05-24 12:13:17 -07001223 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
Mike Travis3b11ce72008-12-17 15:21:39 -08001234 possible = setup_possible_cpus;
1235
Mike Travis730cf272008-12-31 18:08:45 -08001236 total_cpus = max_t(int, possible, num_processors + disabled_cpus);
1237
Yinghai Lu2b633e32010-02-10 01:20:37 -08001238 /* nr_cpu_ids could be reduced via nr_cpus= */
1239 if (possible > nr_cpu_ids) {
Joe Perchesc767a542012-05-21 19:50:07 -07001240 pr_warn("%d Processors exceeds NR_CPUS limit of %d\n",
Yinghai Lu2b633e32010-02-10 01:20:37 -08001241 possible, nr_cpu_ids);
1242 possible = nr_cpu_ids;
Mike Travis3b11ce72008-12-17 15:21:39 -08001243 }
Glauber Costa68a1c3f2008-03-03 14:12:42 -03001244
Jan Beulich5f2eb552010-05-24 12:13:17 -07001245#ifdef CONFIG_HOTPLUG_CPU
1246 if (!setup_max_cpus)
1247#endif
1248 if (possible > i) {
Joe Perchesc767a542012-05-21 19:50:07 -07001249 pr_warn("%d Processors exceeds max_cpus limit of %u\n",
Jan Beulich5f2eb552010-05-24 12:13:17 -07001250 possible, setup_max_cpus);
1251 possible = i;
1252 }
1253
Joe Perchesc767a542012-05-21 19:50:07 -07001254 pr_info("Allowing %d CPUs, %d hotplug CPUs\n",
Glauber Costa68a1c3f2008-03-03 14:12:42 -03001255 possible, max_t(int, possible - num_processors, 0));
1256
1257 for (i = 0; i < possible; i++)
Mike Travisc2d1cec2009-01-04 05:18:03 -08001258 set_cpu_possible(i, true);
Jan Beulich5f2eb552010-05-24 12:13:17 -07001259 for (; i < NR_CPUS; i++)
1260 set_cpu_possible(i, false);
Mike Travis3461b0a2008-05-12 21:21:13 +02001261
1262 nr_cpu_ids = possible;
Glauber Costa68a1c3f2008-03-03 14:12:42 -03001263}
Glauber Costa69c18c12008-03-03 14:13:07 -03001264
Chuck Ebbert14adf852008-09-29 18:29:42 -04001265#ifdef CONFIG_HOTPLUG_CPU
1266
1267static void remove_siblinginfo(int cpu)
1268{
1269 int sibling;
1270 struct cpuinfo_x86 *c = &cpu_data(cpu);
1271
Mike Travisc2d1cec2009-01-04 05:18:03 -08001272 for_each_cpu(sibling, cpu_core_mask(cpu)) {
1273 cpumask_clear_cpu(cpu, cpu_core_mask(sibling));
Chuck Ebbert14adf852008-09-29 18:29:42 -04001274 /*/
1275 * last thread sibling in this cpu core going down
1276 */
Mike Travisc2d1cec2009-01-04 05:18:03 -08001277 if (cpumask_weight(cpu_sibling_mask(cpu)) == 1)
Chuck Ebbert14adf852008-09-29 18:29:42 -04001278 cpu_data(sibling).booted_cores--;
1279 }
1280
Mike Travisc2d1cec2009-01-04 05:18:03 -08001281 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));
Chuck Ebbert14adf852008-09-29 18:29:42 -04001285 c->phys_proc_id = 0;
1286 c->cpu_core_id = 0;
Mike Travisc2d1cec2009-01-04 05:18:03 -08001287 cpumask_clear_cpu(cpu, cpu_sibling_setup_mask);
Chuck Ebbert14adf852008-09-29 18:29:42 -04001288}
1289
Glauber Costa69c18c12008-03-03 14:13:07 -03001290static void __ref remove_cpu_from_maps(int cpu)
1291{
Mike Travisc2d1cec2009-01-04 05:18:03 -08001292 set_cpu_online(cpu, false);
1293 cpumask_clear_cpu(cpu, cpu_callout_mask);
1294 cpumask_clear_cpu(cpu, cpu_callin_mask);
Glauber Costa69c18c12008-03-03 14:13:07 -03001295 /* was set by cpu_init() */
Mike Travisc2d1cec2009-01-04 05:18:03 -08001296 cpumask_clear_cpu(cpu, cpu_initialized_mask);
Mike Travis23ca4bb2008-05-12 21:21:12 +02001297 numa_remove_cpu(cpu);
Glauber Costa69c18c12008-03-03 14:13:07 -03001298}
1299
Alex Nixon8227dce2008-08-22 11:52:14 +01001300void cpu_disable_common(void)
1301{
1302 int cpu = smp_processor_id();
Alex Nixon8227dce2008-08-22 11:52:14 +01001303
Alex Nixon8227dce2008-08-22 11:52:14 +01001304 remove_siblinginfo(cpu);
1305
1306 /* It's now safe to remove this processor from the online map */
1307 lock_vector_lock();
1308 remove_cpu_from_maps(cpu);
1309 unlock_vector_lock();
Mike Travisd7b381b2008-12-16 17:33:58 -08001310 fixup_irqs();
Alex Nixon8227dce2008-08-22 11:52:14 +01001311}
1312
Alex Nixon93be71b2008-08-22 11:52:11 +01001313int native_cpu_disable(void)
Glauber Costa69c18c12008-03-03 14:13:07 -03001314{
Prarit Bhargavada6139e2014-01-13 06:51:01 -05001315 int ret;
1316
1317 ret = check_irq_vectors_for_cpu_disable();
1318 if (ret)
1319 return ret;
1320
Glauber Costa69c18c12008-03-03 14:13:07 -03001321 clear_local_APIC();
1322
Alex Nixon8227dce2008-08-22 11:52:14 +01001323 cpu_disable_common();
Glauber Costa69c18c12008-03-03 14:13:07 -03001324 return 0;
1325}
1326
Alex Nixon93be71b2008-08-22 11:52:11 +01001327void native_cpu_die(unsigned int cpu)
Glauber Costa69c18c12008-03-03 14:13:07 -03001328{
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) {
Mike Travis2eaad1f2009-12-10 17:19:36 -08001335 if (system_state == SYSTEM_RUNNING)
1336 pr_info("CPU %u is now offline\n", cpu);
Glauber Costa69c18c12008-03-03 14:13:07 -03001337 return;
1338 }
1339 msleep(100);
1340 }
Mike Travis2eaad1f2009-12-10 17:19:36 -08001341 pr_err("CPU %u didn't die...\n", cpu);
Glauber Costa69c18c12008-03-03 14:13:07 -03001342}
Alex Nixona21f5d882008-08-22 11:52:13 +01001343
1344void play_dead_common(void)
1345{
1346 idle_task_exit();
1347 reset_lazy_tlbstate();
Len Brown02c68a02011-04-01 16:59:53 -04001348 amd_e400_remove_cpu(raw_smp_processor_id());
Alex Nixona21f5d882008-08-22 11:52:13 +01001349
1350 mb();
1351 /* Ack it */
Tejun Heo0a3aee02010-12-18 16:28:55 +01001352 __this_cpu_write(cpu_state, CPU_DEAD);
Alex Nixona21f5d882008-08-22 11:52:13 +01001353
1354 /*
1355 * With physical CPU hotplug, we should halt the cpu
1356 */
1357 local_irq_disable();
1358}
1359
Fenghua Yue1c467e2012-11-14 04:36:53 -08001360static bool wakeup_cpu0(void)
1361{
1362 if (smp_processor_id() == 0 && enable_start_cpu0)
1363 return true;
1364
1365 return false;
1366}
1367
H. Peter Anvinea530692010-09-17 15:39:11 -07001368/*
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 */
1372static 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;
H. Peter Anvince5f6822010-09-20 13:04:45 -07001377 void *mwait_ptr;
Borislav Petkov576cfb42013-03-04 21:16:16 +01001378 int i;
H. Peter Anvinea530692010-09-17 15:39:11 -07001379
Len Brown69fb3672013-02-10 01:38:39 -05001380 if (!this_cpu_has(X86_FEATURE_MWAIT))
H. Peter Anvinea530692010-09-17 15:39:11 -07001381 return;
Christoph Lameter349c0042011-03-12 12:50:10 +01001382 if (!this_cpu_has(X86_FEATURE_CLFLSH))
H. Peter Anvince5f6822010-09-20 13:04:45 -07001383 return;
Tejun Heo7b543a52010-12-18 16:30:05 +01001384 if (__this_cpu_read(cpu_info.cpuid_level) < CPUID_MWAIT_LEAF)
H. Peter Anvinea530692010-09-17 15:39:11 -07001385 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
H. Peter Anvince5f6822010-09-20 13:04:45 -07001409 /*
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 = &current_thread_info()->flags;
1415
H. Peter Anvina68e5c92010-09-17 17:06:46 -07001416 wbinvd();
1417
H. Peter Anvinea530692010-09-17 15:39:11 -07001418 while (1) {
H. Peter Anvince5f6822010-09-20 13:04:45 -07001419 /*
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 */
H. Peter Anvin7d590cc2013-12-19 12:30:03 -08001426 mb();
H. Peter Anvince5f6822010-09-20 13:04:45 -07001427 clflush(mwait_ptr);
H. Peter Anvin7d590cc2013-12-19 12:30:03 -08001428 mb();
H. Peter Anvince5f6822010-09-20 13:04:45 -07001429 __monitor(mwait_ptr, 0, 0);
H. Peter Anvinea530692010-09-17 15:39:11 -07001430 mb();
1431 __mwait(eax, 0);
Fenghua Yue1c467e2012-11-14 04:36:53 -08001432 /*
1433 * If NMI wants to wake up CPU0, start CPU0.
1434 */
1435 if (wakeup_cpu0())
1436 start_cpu0();
H. Peter Anvinea530692010-09-17 15:39:11 -07001437 }
1438}
1439
1440static inline void hlt_play_dead(void)
1441{
Tejun Heo7b543a52010-12-18 16:30:05 +01001442 if (__this_cpu_read(cpu_info.x86) >= 4)
H. Peter Anvina68e5c92010-09-17 17:06:46 -07001443 wbinvd();
1444
H. Peter Anvinea530692010-09-17 15:39:11 -07001445 while (1) {
H. Peter Anvinea530692010-09-17 15:39:11 -07001446 native_halt();
Fenghua Yue1c467e2012-11-14 04:36:53 -08001447 /*
1448 * If NMI wants to wake up CPU0, start CPU0.
1449 */
1450 if (wakeup_cpu0())
1451 start_cpu0();
H. Peter Anvinea530692010-09-17 15:39:11 -07001452 }
1453}
1454
Alex Nixona21f5d882008-08-22 11:52:13 +01001455void native_play_dead(void)
1456{
1457 play_dead_common();
Joseph Cihula86886e52009-06-30 19:31:07 -07001458 tboot_shutdown(TB_SHUTDOWN_WFS);
H. Peter Anvinea530692010-09-17 15:39:11 -07001459
1460 mwait_play_dead(); /* Only returns on failure */
Boris Ostrovsky1a022e32012-03-13 19:55:09 +01001461 if (cpuidle_play_dead())
1462 hlt_play_dead();
Alex Nixona21f5d882008-08-22 11:52:13 +01001463}
1464
Glauber Costa69c18c12008-03-03 14:13:07 -03001465#else /* ... !CONFIG_HOTPLUG_CPU */
Alex Nixon93be71b2008-08-22 11:52:11 +01001466int native_cpu_disable(void)
Glauber Costa69c18c12008-03-03 14:13:07 -03001467{
1468 return -ENOSYS;
1469}
1470
Alex Nixon93be71b2008-08-22 11:52:11 +01001471void native_cpu_die(unsigned int cpu)
Glauber Costa69c18c12008-03-03 14:13:07 -03001472{
1473 /* We said "no" in __cpu_disable */
1474 BUG();
1475}
Alex Nixona21f5d882008-08-22 11:52:13 +01001476
1477void native_play_dead(void)
1478{
1479 BUG();
1480}
1481
Glauber Costa68a1c3f2008-03-03 14:12:42 -03001482#endif