blob: ba43dfed353dd39f73f663182821ac1eddbe70f0 [file] [log] [blame]
Glauber de Oliveira Costa4cedb332008-03-19 14:26:14 -03001/*
2 * 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
Glauber Costa68a1c3f2008-03-03 14:12:42 -030042#include <linux/init.h>
43#include <linux/smp.h>
Glauber Costaa3553522008-03-03 14:12:58 -030044#include <linux/module.h>
Glauber Costa70708a12008-03-03 14:13:03 -030045#include <linux/sched.h>
Glauber Costa69c18c12008-03-03 14:13:07 -030046#include <linux/percpu.h>
Glauber Costa91718e82008-03-03 14:13:12 -030047#include <linux/bootmem.h>
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -030048#include <linux/err.h>
49#include <linux/nmi.h>
Shane Wang69575d32009-09-01 18:25:07 -070050#include <linux/tboot.h>
Glauber Costa69c18c12008-03-03 14:13:07 -030051
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -030052#include <asm/acpi.h>
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -030053#include <asm/desc.h>
Glauber Costa69c18c12008-03-03 14:13:07 -030054#include <asm/nmi.h>
55#include <asm/irq.h>
Ingo Molnar07bbc162008-09-23 23:26:42 +020056#include <asm/idle.h>
Pavel Macheke44b7b72008-04-10 23:28:10 +020057#include <asm/trampoline.h>
Glauber Costa69c18c12008-03-03 14:13:07 -030058#include <asm/cpu.h>
59#include <asm/numa.h>
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -030060#include <asm/pgtable.h>
61#include <asm/tlbflush.h>
62#include <asm/mtrr.h>
Glauber de Oliveira Costabbc2ff62008-03-19 14:26:00 -030063#include <asm/vmi.h>
Ingo Molnar7b6aa332009-02-17 13:58:15 +010064#include <asm/apic.h>
Yinghai Lu569712b2008-11-16 03:12:49 -080065#include <asm/setup.h>
Tejun Heobdbcdd42009-01-21 17:26:06 +090066#include <asm/uv/uv.h>
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -030067#include <linux/mc146818rtc.h>
Glauber Costa68a1c3f2008-03-03 14:12:42 -030068
Ingo Molnar1164dd02009-01-28 19:34:09 +010069#include <asm/smpboot_hooks.h>
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -030070
Alexey Starikovskiy16ecf7a2008-04-04 23:41:00 +040071#ifdef CONFIG_X86_32
Glauber de Oliveira Costa4cedb332008-03-19 14:26:14 -030072u8 apicid_2_node[MAX_APICID];
Hugh Dickins61165d72008-05-13 14:26:57 +010073static int low_mappings;
Glauber de Oliveira Costaacbb6732008-03-19 14:26:13 -030074#endif
75
Glauber de Oliveira Costaa8db8452008-03-19 14:26:01 -030076/* State of each CPU */
77DEFINE_PER_CPU(int, cpu_state) = { 0 };
78
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -030079/* Store all idle threads, this can be reused instead of creating
80* a new thread. Also avoids complicated thread destroy functionality
81* for idle threads.
82*/
83#ifdef CONFIG_HOTPLUG_CPU
84/*
85 * Needed only for CONFIG_HOTPLUG_CPU because __cpuinitdata is
86 * removed after init for !CONFIG_HOTPLUG_CPU.
87 */
88static DEFINE_PER_CPU(struct task_struct *, idle_thread_array);
89#define get_idle_for_cpu(x) (per_cpu(idle_thread_array, x))
90#define set_idle_for_cpu(x, p) (per_cpu(idle_thread_array, x) = (p))
91#else
Jaswinder Singhf86c9982008-07-25 10:52:53 +053092static struct task_struct *idle_thread_array[NR_CPUS] __cpuinitdata ;
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -030093#define get_idle_for_cpu(x) (idle_thread_array[(x)])
94#define set_idle_for_cpu(x, p) (idle_thread_array[(x)] = (p))
95#endif
Glauber de Oliveira Costaf6bc4022008-03-19 14:25:53 -030096
Glauber Costaa3553522008-03-03 14:12:58 -030097/* Number of siblings per CPU package */
98int smp_num_siblings = 1;
99EXPORT_SYMBOL(smp_num_siblings);
100
101/* Last level cache ID of each logical CPU */
102DEFINE_PER_CPU(u16, cpu_llc_id) = BAD_APICID;
103
Glauber Costaa3553522008-03-03 14:12:58 -0300104/* representing HT siblings of each logical CPU */
Rusty Russell7ad728f2009-03-13 14:49:50 +1030105DEFINE_PER_CPU(cpumask_var_t, cpu_sibling_map);
Glauber Costaa3553522008-03-03 14:12:58 -0300106EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
107
108/* representing HT and core siblings of each logical CPU */
Rusty Russell7ad728f2009-03-13 14:49:50 +1030109DEFINE_PER_CPU(cpumask_var_t, cpu_core_map);
Glauber Costaa3553522008-03-03 14:12:58 -0300110EXPORT_PER_CPU_SYMBOL(cpu_core_map);
111
112/* Per CPU bogomips and other parameters */
113DEFINE_PER_CPU_SHARED_ALIGNED(struct cpuinfo_x86, cpu_info);
114EXPORT_PER_CPU_SYMBOL(cpu_info);
Glauber Costa768d9502008-03-03 14:13:02 -0300115
Yinghai Lu2b6163b2009-02-25 20:50:49 -0800116atomic_t init_deasserted;
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300117
Glauber de Oliveira Costa7cc39592008-03-19 14:25:56 -0300118#if defined(CONFIG_NUMA) && defined(CONFIG_X86_32)
Glauber de Oliveira Costa7cc39592008-03-19 14:25:56 -0300119/* which node each logical CPU is on */
120int cpu_to_node_map[NR_CPUS] __read_mostly = { [0 ... NR_CPUS-1] = 0 };
121EXPORT_SYMBOL(cpu_to_node_map);
122
123/* set up a mapping between cpu and node. */
124static void map_cpu_to_node(int cpu, int node)
125{
126 printk(KERN_INFO "Mapping cpu %d to node %d\n", cpu, node);
Rusty Russellc032ef602009-03-13 14:49:53 +1030127 cpumask_set_cpu(cpu, node_to_cpumask_map[node]);
Glauber de Oliveira Costa7cc39592008-03-19 14:25:56 -0300128 cpu_to_node_map[cpu] = node;
129}
130
131/* undo a mapping between cpu and node. */
132static void unmap_cpu_to_node(int cpu)
133{
134 int node;
135
136 printk(KERN_INFO "Unmapping cpu %d from all nodes\n", cpu);
137 for (node = 0; node < MAX_NUMNODES; node++)
Rusty Russellc032ef602009-03-13 14:49:53 +1030138 cpumask_clear_cpu(cpu, node_to_cpumask_map[node]);
Glauber de Oliveira Costa7cc39592008-03-19 14:25:56 -0300139 cpu_to_node_map[cpu] = 0;
140}
141#else /* !(CONFIG_NUMA && CONFIG_X86_32) */
142#define map_cpu_to_node(cpu, node) ({})
143#define unmap_cpu_to_node(cpu) ({})
144#endif
145
146#ifdef CONFIG_X86_32
Suresh Siddha1b374e42008-07-10 11:16:49 -0700147static int boot_cpu_logical_apicid;
148
Glauber de Oliveira Costa7cc39592008-03-19 14:25:56 -0300149u8 cpu_2_logical_apicid[NR_CPUS] __read_mostly =
150 { [0 ... NR_CPUS-1] = BAD_APICID };
151
Ingo Molnara4928cf2008-04-23 13:20:56 +0200152static void map_cpu_to_logical_apicid(void)
Glauber de Oliveira Costa7cc39592008-03-19 14:25:56 -0300153{
154 int cpu = smp_processor_id();
155 int apicid = logical_smp_processor_id();
Ingo Molnar3f57a312009-01-28 06:50:47 +0100156 int node = apic->apicid_to_node(apicid);
Glauber de Oliveira Costa7cc39592008-03-19 14:25:56 -0300157
158 if (!node_online(node))
159 node = first_online_node;
160
161 cpu_2_logical_apicid[cpu] = apicid;
162 map_cpu_to_node(cpu, node);
163}
164
Glauber Costa1481a3d2008-06-04 15:35:03 -0300165void numa_remove_cpu(int cpu)
Glauber de Oliveira Costa7cc39592008-03-19 14:25:56 -0300166{
167 cpu_2_logical_apicid[cpu] = BAD_APICID;
168 unmap_cpu_to_node(cpu);
169}
170#else
Glauber de Oliveira Costa7cc39592008-03-19 14:25:56 -0300171#define map_cpu_to_logical_apicid() do {} while (0)
172#endif
173
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300174/*
175 * Report back to the Boot Processor.
176 * Running on AP.
177 */
Ingo Molnara4928cf2008-04-23 13:20:56 +0200178static void __cpuinit smp_callin(void)
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300179{
180 int cpuid, phys_id;
181 unsigned long timeout;
182
183 /*
184 * If waken up by an INIT in an 82489DX configuration
185 * we may get here before an INIT-deassert IPI reaches
186 * our local APIC. We have to wait for the IPI or we'll
187 * lock up on an APIC access.
188 */
Ingo Molnara9659362009-01-28 16:21:32 +0100189 if (apic->wait_for_init_deassert)
190 apic->wait_for_init_deassert(&init_deasserted);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300191
192 /*
193 * (This works even if the APIC is not enabled.)
194 */
Yinghai Lu4c9961d2008-07-11 18:44:16 -0700195 phys_id = read_apic_id();
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300196 cpuid = smp_processor_id();
Mike Travisc2d1cec2009-01-04 05:18:03 -0800197 if (cpumask_test_cpu(cpuid, cpu_callin_mask)) {
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300198 panic("%s: phys CPU#%d, CPU#%d already present??\n", __func__,
199 phys_id, cpuid);
200 }
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200201 pr_debug("CPU#%d (phys ID: %d) waiting for CALLOUT\n", cpuid, phys_id);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300202
203 /*
204 * STARTUP IPIs are fragile beasts as they might sometimes
205 * trigger some glue motherboard logic. Complete APIC bus
206 * silence for 1 second, this overestimates the time the
207 * boot CPU is spending to send the up to 2 STARTUP IPIs
208 * by a factor of two. This should be enough.
209 */
210
211 /*
212 * Waiting 2s total for startup (udelay is not yet working)
213 */
214 timeout = jiffies + 2*HZ;
215 while (time_before(jiffies, timeout)) {
216 /*
217 * Has the boot CPU finished it's STARTUP sequence?
218 */
Mike Travisc2d1cec2009-01-04 05:18:03 -0800219 if (cpumask_test_cpu(cpuid, cpu_callout_mask))
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300220 break;
221 cpu_relax();
222 }
223
224 if (!time_before(jiffies, timeout)) {
225 panic("%s: CPU%d started up but did not get a callout!\n",
226 __func__, cpuid);
227 }
228
229 /*
230 * the boot CPU has finished the init stage and is spinning
231 * on callin_map until we finish. We are free to set up this
232 * CPU, first the APIC. (this is probably redundant on most
233 * boards)
234 */
235
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200236 pr_debug("CALLIN, before setup_local_APIC().\n");
Ingo Molnar333344d2009-01-28 16:31:52 +0100237 if (apic->smp_callin_clear_local_apic)
238 apic->smp_callin_clear_local_apic();
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300239 setup_local_APIC();
240 end_local_APIC_setup();
241 map_cpu_to_logical_apicid();
242
Manfred Spraule545a612008-09-07 16:57:22 +0200243 notify_cpu_starting(cpuid);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300244 /*
245 * Get our bogomips.
246 *
247 * Need to enable IRQs because it can take longer and then
248 * the NMI watchdog might kill us.
249 */
250 local_irq_enable();
251 calibrate_delay();
252 local_irq_disable();
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200253 pr_debug("Stack at about %p\n", &cpuid);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300254
255 /*
256 * Save our processor parameters
257 */
258 smp_store_cpu_info(cpuid);
259
260 /*
261 * Allow the master to continue.
262 */
Mike Travisc2d1cec2009-01-04 05:18:03 -0800263 cpumask_set_cpu(cpuid, cpu_callin_mask);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300264}
265
Glauber de Oliveira Costabbc2ff62008-03-19 14:26:00 -0300266/*
267 * Activate a secondary processor.
268 */
Frederic Weisbecker0ca59dd2008-12-24 23:30:02 +0100269notrace static void __cpuinit start_secondary(void *unused)
Glauber de Oliveira Costabbc2ff62008-03-19 14:26:00 -0300270{
271 /*
272 * Don't put *anything* before cpu_init(), SMP booting is too
273 * fragile that we want to limit the things done here to the
274 * most necessary things.
275 */
Glauber de Oliveira Costabbc2ff62008-03-19 14:26:00 -0300276 vmi_bringup();
Glauber de Oliveira Costabbc2ff62008-03-19 14:26:00 -0300277 cpu_init();
278 preempt_disable();
279 smp_callin();
280
281 /* otherwise gcc will move up smp_processor_id before the cpu_init */
282 barrier();
283 /*
284 * Check TSC synchronization with the BP:
285 */
286 check_tsc_sync_target();
287
288 if (nmi_watchdog == NMI_IO_APIC) {
289 disable_8259A_irq(0);
290 enable_NMI_through_LVT0();
291 enable_8259A_irq(0);
292 }
293
Hugh Dickins61165d72008-05-13 14:26:57 +0100294#ifdef CONFIG_X86_32
295 while (low_mappings)
296 cpu_relax();
297 __flush_tlb_all();
298#endif
299
Rusty Russell4f062892009-03-13 14:49:54 +1030300 /* This must be done before setting cpu_online_mask */
Glauber de Oliveira Costabbc2ff62008-03-19 14:26:00 -0300301 set_cpu_sibling_map(raw_smp_processor_id());
302 wmb();
303
304 /*
305 * We need to hold call_lock, so there is no inconsistency
306 * between the time smp_call_function() determines number of
307 * IPI recipients, and the time when the determination is made
308 * for which cpus receive the IPI. Holding this
309 * lock helps us to not include this cpu in a currently in progress
310 * smp_call_function().
Eric W. Biedermand388e5f2008-08-09 15:09:02 -0700311 *
312 * We need to hold vector_lock so there the set of online cpus
313 * does not change while we are assigning vectors to cpus. Holding
314 * this lock ensures we don't half assign or remove an irq from a cpu.
Glauber de Oliveira Costabbc2ff62008-03-19 14:26:00 -0300315 */
Manfred Spraul0cefa5b2008-09-07 11:29:58 +0200316 ipi_call_lock();
Eric W. Biedermand388e5f2008-08-09 15:09:02 -0700317 lock_vector_lock();
318 __setup_vector_irq(smp_processor_id());
Mike Travisc2d1cec2009-01-04 05:18:03 -0800319 set_cpu_online(smp_processor_id(), true);
Eric W. Biedermand388e5f2008-08-09 15:09:02 -0700320 unlock_vector_lock();
Manfred Spraul0cefa5b2008-09-07 11:29:58 +0200321 ipi_call_unlock();
Glauber de Oliveira Costabbc2ff62008-03-19 14:26:00 -0300322 per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE;
323
Manfred Spraul0cefa5b2008-09-07 11:29:58 +0200324 /* enable local interrupts */
325 local_irq_enable();
326
Thomas Gleixner736deca2009-08-19 12:35:53 +0200327 x86_cpuinit.setup_percpu_clockev();
Glauber de Oliveira Costabbc2ff62008-03-19 14:26:00 -0300328
329 wmb();
330 cpu_idle();
331}
332
Rusty Russell155dd722009-03-13 14:49:53 +1030333#ifdef CONFIG_CPUMASK_OFFSTACK
334/* In this case, llc_shared_map is a pointer to a cpumask. */
335static inline void copy_cpuinfo_x86(struct cpuinfo_x86 *dst,
336 const struct cpuinfo_x86 *src)
337{
338 struct cpumask *llc = dst->llc_shared_map;
339 *dst = *src;
340 dst->llc_shared_map = llc;
341}
342#else
343static inline void copy_cpuinfo_x86(struct cpuinfo_x86 *dst,
344 const struct cpuinfo_x86 *src)
345{
346 *dst = *src;
347}
348#endif /* CONFIG_CPUMASK_OFFSTACK */
349
Glauber de Oliveira Costa1d89a7f2008-03-19 14:25:05 -0300350/*
351 * The bootstrap kernel entry code has set these up. Save them for
352 * a given CPU
353 */
354
355void __cpuinit smp_store_cpu_info(int id)
356{
357 struct cpuinfo_x86 *c = &cpu_data(id);
358
Rusty Russell155dd722009-03-13 14:49:53 +1030359 copy_cpuinfo_x86(c, &boot_cpu_data);
Glauber de Oliveira Costa1d89a7f2008-03-19 14:25:05 -0300360 c->cpu_index = id;
361 if (id != 0)
362 identify_secondary_cpu(c);
Glauber de Oliveira Costa1d89a7f2008-03-19 14:25:05 -0300363}
364
365
Glauber Costa768d9502008-03-03 14:13:02 -0300366void __cpuinit set_cpu_sibling_map(int cpu)
367{
368 int i;
369 struct cpuinfo_x86 *c = &cpu_data(cpu);
370
Mike Travisc2d1cec2009-01-04 05:18:03 -0800371 cpumask_set_cpu(cpu, cpu_sibling_setup_mask);
Glauber Costa768d9502008-03-03 14:13:02 -0300372
373 if (smp_num_siblings > 1) {
Mike Travisc2d1cec2009-01-04 05:18:03 -0800374 for_each_cpu(i, cpu_sibling_setup_mask) {
375 struct cpuinfo_x86 *o = &cpu_data(i);
376
377 if (c->phys_proc_id == o->phys_proc_id &&
378 c->cpu_core_id == o->cpu_core_id) {
379 cpumask_set_cpu(i, cpu_sibling_mask(cpu));
380 cpumask_set_cpu(cpu, cpu_sibling_mask(i));
381 cpumask_set_cpu(i, cpu_core_mask(cpu));
382 cpumask_set_cpu(cpu, cpu_core_mask(i));
Rusty Russell155dd722009-03-13 14:49:53 +1030383 cpumask_set_cpu(i, c->llc_shared_map);
384 cpumask_set_cpu(cpu, o->llc_shared_map);
Glauber Costa768d9502008-03-03 14:13:02 -0300385 }
386 }
387 } else {
Mike Travisc2d1cec2009-01-04 05:18:03 -0800388 cpumask_set_cpu(cpu, cpu_sibling_mask(cpu));
Glauber Costa768d9502008-03-03 14:13:02 -0300389 }
390
Rusty Russell155dd722009-03-13 14:49:53 +1030391 cpumask_set_cpu(cpu, c->llc_shared_map);
Glauber Costa768d9502008-03-03 14:13:02 -0300392
393 if (current_cpu_data.x86_max_cores == 1) {
Mike Travisc2d1cec2009-01-04 05:18:03 -0800394 cpumask_copy(cpu_core_mask(cpu), cpu_sibling_mask(cpu));
Glauber Costa768d9502008-03-03 14:13:02 -0300395 c->booted_cores = 1;
396 return;
397 }
398
Mike Travisc2d1cec2009-01-04 05:18:03 -0800399 for_each_cpu(i, cpu_sibling_setup_mask) {
Glauber Costa768d9502008-03-03 14:13:02 -0300400 if (per_cpu(cpu_llc_id, cpu) != BAD_APICID &&
401 per_cpu(cpu_llc_id, cpu) == per_cpu(cpu_llc_id, i)) {
Rusty Russell155dd722009-03-13 14:49:53 +1030402 cpumask_set_cpu(i, c->llc_shared_map);
403 cpumask_set_cpu(cpu, cpu_data(i).llc_shared_map);
Glauber Costa768d9502008-03-03 14:13:02 -0300404 }
405 if (c->phys_proc_id == cpu_data(i).phys_proc_id) {
Mike Travisc2d1cec2009-01-04 05:18:03 -0800406 cpumask_set_cpu(i, cpu_core_mask(cpu));
407 cpumask_set_cpu(cpu, cpu_core_mask(i));
Glauber Costa768d9502008-03-03 14:13:02 -0300408 /*
409 * Does this new cpu bringup a new core?
410 */
Mike Travisc2d1cec2009-01-04 05:18:03 -0800411 if (cpumask_weight(cpu_sibling_mask(cpu)) == 1) {
Glauber Costa768d9502008-03-03 14:13:02 -0300412 /*
413 * for each core in package, increment
414 * the booted_cores for this new cpu
415 */
Mike Travisc2d1cec2009-01-04 05:18:03 -0800416 if (cpumask_first(cpu_sibling_mask(i)) == i)
Glauber Costa768d9502008-03-03 14:13:02 -0300417 c->booted_cores++;
418 /*
419 * increment the core count for all
420 * the other cpus in this package
421 */
422 if (i != cpu)
423 cpu_data(i).booted_cores++;
424 } else if (i != cpu && !c->booted_cores)
425 c->booted_cores = cpu_data(i).booted_cores;
426 }
427 }
428}
429
Glauber Costa70708a12008-03-03 14:13:03 -0300430/* maps the cpu to the sched domain representing multi-core */
Rusty Russell030bb202008-12-26 22:23:41 +1030431const struct cpumask *cpu_coregroup_mask(int cpu)
Glauber Costa70708a12008-03-03 14:13:03 -0300432{
433 struct cpuinfo_x86 *c = &cpu_data(cpu);
434 /*
435 * For perf, we return last level cache shared map.
436 * And for power savings, we return cpu_core_map
437 */
Andreas Herrmann5a925b42009-09-03 09:44:28 +0200438 if ((sched_mc_power_savings || sched_smt_power_savings) &&
439 !(cpu_has(c, X86_FEATURE_AMD_DCM)))
Mike Travisc2d1cec2009-01-04 05:18:03 -0800440 return cpu_core_mask(cpu);
Glauber Costa70708a12008-03-03 14:13:03 -0300441 else
Rusty Russell155dd722009-03-13 14:49:53 +1030442 return c->llc_shared_map;
Rusty Russell030bb202008-12-26 22:23:41 +1030443}
444
Ingo Molnara4928cf2008-04-23 13:20:56 +0200445static void impress_friends(void)
Glauber de Oliveira Costa904541e2008-03-19 14:25:27 -0300446{
447 int cpu;
448 unsigned long bogosum = 0;
449 /*
450 * Allow the user to impress friends.
451 */
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200452 pr_debug("Before bogomips.\n");
Glauber de Oliveira Costa904541e2008-03-19 14:25:27 -0300453 for_each_possible_cpu(cpu)
Mike Travisc2d1cec2009-01-04 05:18:03 -0800454 if (cpumask_test_cpu(cpu, cpu_callout_mask))
Glauber de Oliveira Costa904541e2008-03-19 14:25:27 -0300455 bogosum += cpu_data(cpu).loops_per_jiffy;
456 printk(KERN_INFO
457 "Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
Glauber de Oliveira Costaf68e00a2008-03-19 14:25:29 -0300458 num_online_cpus(),
Glauber de Oliveira Costa904541e2008-03-19 14:25:27 -0300459 bogosum/(500000/HZ),
460 (bogosum/(5000/HZ))%100);
461
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200462 pr_debug("Before bogocount - setting activated=1.\n");
Glauber de Oliveira Costa904541e2008-03-19 14:25:27 -0300463}
464
Yinghai Lu569712b2008-11-16 03:12:49 -0800465void __inquire_remote_apic(int apicid)
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300466{
467 unsigned i, regs[] = { APIC_ID >> 4, APIC_LVR >> 4, APIC_SPIV >> 4 };
468 char *names[] = { "ID", "VERSION", "SPIV" };
469 int timeout;
470 u32 status;
471
Yinghai Lu823b2592008-09-10 21:56:46 -0700472 printk(KERN_INFO "Inquiring remote APIC 0x%x...\n", apicid);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300473
474 for (i = 0; i < ARRAY_SIZE(regs); i++) {
Yinghai Lu823b2592008-09-10 21:56:46 -0700475 printk(KERN_INFO "... APIC 0x%x %s: ", apicid, names[i]);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300476
477 /*
478 * Wait for idle.
479 */
480 status = safe_apic_wait_icr_idle();
481 if (status)
482 printk(KERN_CONT
483 "a previous APIC delivery may have failed\n");
484
Suresh Siddha1b374e42008-07-10 11:16:49 -0700485 apic_icr_write(APIC_DM_REMRD | regs[i], apicid);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300486
487 timeout = 0;
488 do {
489 udelay(100);
490 status = apic_read(APIC_ICR) & APIC_ICR_RR_MASK;
491 } while (status == APIC_ICR_RR_INPROG && timeout++ < 1000);
492
493 switch (status) {
494 case APIC_ICR_RR_VALID:
495 status = apic_read(APIC_RRR);
496 printk(KERN_CONT "%08x\n", status);
497 break;
498 default:
499 printk(KERN_CONT "failed\n");
500 }
501 }
502}
503
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300504/*
505 * Poke the other CPU in the eye via NMI to wake it up. Remember that the normal
506 * INIT, INIT, STARTUP sequence will reset the chip hard for us, and this
507 * won't ... remember to clear down the APIC, etc later.
508 */
Cyrill Gorcunovcece3152009-04-18 23:45:28 +0400509int __cpuinit
Yinghai Lu569712b2008-11-16 03:12:49 -0800510wakeup_secondary_cpu_via_nmi(int logical_apicid, unsigned long start_eip)
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300511{
512 unsigned long send_status, accept_status = 0;
513 int maxlvt;
514
515 /* Target chip */
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300516 /* Boot on the stack */
517 /* Kick the second */
Ingo Molnarbdb1a9b2009-01-28 05:29:25 +0100518 apic_icr_write(APIC_DM_NMI | apic->dest_logical, logical_apicid);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300519
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200520 pr_debug("Waiting for send to finish...\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300521 send_status = safe_apic_wait_icr_idle();
522
523 /*
524 * Give the other CPU some time to accept the IPI.
525 */
526 udelay(200);
Yinghai Lu569712b2008-11-16 03:12:49 -0800527 if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) {
Cyrill Gorcunov59ef48a2008-09-14 21:58:49 +0400528 maxlvt = lapic_get_maxlvt();
529 if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */
530 apic_write(APIC_ESR, 0);
531 accept_status = (apic_read(APIC_ESR) & 0xEF);
532 }
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200533 pr_debug("NMI sent.\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300534
535 if (send_status)
536 printk(KERN_ERR "APIC never delivered???\n");
537 if (accept_status)
538 printk(KERN_ERR "APIC delivery error (%lx).\n", accept_status);
539
540 return (send_status | accept_status);
541}
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300542
Cyrill Gorcunovcece3152009-04-18 23:45:28 +0400543static int __cpuinit
Yinghai Lu569712b2008-11-16 03:12:49 -0800544wakeup_secondary_cpu_via_init(int phys_apicid, unsigned long start_eip)
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300545{
546 unsigned long send_status, accept_status = 0;
547 int maxlvt, num_starts, j;
548
Maciej W. Rozycki593f4a72008-07-16 19:15:30 +0100549 maxlvt = lapic_get_maxlvt();
550
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300551 /*
552 * Be paranoid about clearing APIC errors.
553 */
554 if (APIC_INTEGRATED(apic_version[phys_apicid])) {
Maciej W. Rozycki593f4a72008-07-16 19:15:30 +0100555 if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */
556 apic_write(APIC_ESR, 0);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300557 apic_read(APIC_ESR);
558 }
559
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200560 pr_debug("Asserting INIT.\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300561
562 /*
563 * Turn INIT on target chip
564 */
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300565 /*
566 * Send IPI
567 */
Suresh Siddha1b374e42008-07-10 11:16:49 -0700568 apic_icr_write(APIC_INT_LEVELTRIG | APIC_INT_ASSERT | APIC_DM_INIT,
569 phys_apicid);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300570
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200571 pr_debug("Waiting for send to finish...\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300572 send_status = safe_apic_wait_icr_idle();
573
574 mdelay(10);
575
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200576 pr_debug("Deasserting INIT.\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300577
578 /* Target chip */
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300579 /* Send IPI */
Suresh Siddha1b374e42008-07-10 11:16:49 -0700580 apic_icr_write(APIC_INT_LEVELTRIG | APIC_DM_INIT, phys_apicid);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300581
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200582 pr_debug("Waiting for send to finish...\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300583 send_status = safe_apic_wait_icr_idle();
584
585 mb();
586 atomic_set(&init_deasserted, 1);
587
588 /*
589 * Should we send STARTUP IPIs ?
590 *
591 * Determine this based on the APIC version.
592 * If we don't have an integrated APIC, don't send the STARTUP IPIs.
593 */
594 if (APIC_INTEGRATED(apic_version[phys_apicid]))
595 num_starts = 2;
596 else
597 num_starts = 0;
598
599 /*
600 * Paravirt / VMI wants a startup IPI hook here to set up the
601 * target processor state.
602 */
603 startup_ipi_hook(phys_apicid, (unsigned long) start_secondary,
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300604 (unsigned long)stack_start.sp);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300605
606 /*
607 * Run STARTUP IPI loop.
608 */
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200609 pr_debug("#startup loops: %d.\n", num_starts);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300610
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300611 for (j = 1; j <= num_starts; j++) {
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200612 pr_debug("Sending STARTUP #%d.\n", j);
Maciej W. Rozycki593f4a72008-07-16 19:15:30 +0100613 if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */
614 apic_write(APIC_ESR, 0);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300615 apic_read(APIC_ESR);
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200616 pr_debug("After apic_write.\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300617
618 /*
619 * STARTUP IPI
620 */
621
622 /* Target chip */
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300623 /* Boot on the stack */
624 /* Kick the second */
Suresh Siddha1b374e42008-07-10 11:16:49 -0700625 apic_icr_write(APIC_DM_STARTUP | (start_eip >> 12),
626 phys_apicid);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300627
628 /*
629 * Give the other CPU some time to accept the IPI.
630 */
631 udelay(300);
632
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200633 pr_debug("Startup point 1.\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300634
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200635 pr_debug("Waiting for send to finish...\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300636 send_status = safe_apic_wait_icr_idle();
637
638 /*
639 * Give the other CPU some time to accept the IPI.
640 */
641 udelay(200);
Maciej W. Rozycki593f4a72008-07-16 19:15:30 +0100642 if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300643 apic_write(APIC_ESR, 0);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300644 accept_status = (apic_read(APIC_ESR) & 0xEF);
645 if (send_status || accept_status)
646 break;
647 }
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200648 pr_debug("After Startup.\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300649
650 if (send_status)
651 printk(KERN_ERR "APIC never delivered???\n");
652 if (accept_status)
653 printk(KERN_ERR "APIC delivery error (%lx).\n", accept_status);
654
655 return (send_status | accept_status);
656}
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300657
658struct create_idle {
659 struct work_struct work;
660 struct task_struct *idle;
661 struct completion done;
662 int cpu;
663};
664
665static void __cpuinit do_fork_idle(struct work_struct *work)
666{
667 struct create_idle *c_idle =
668 container_of(work, struct create_idle, work);
669
670 c_idle->idle = fork_idle(c_idle->cpu);
671 complete(&c_idle->done);
672}
673
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300674/*
675 * NOTE - on most systems this is a PHYSICAL apic ID, but on multiquad
676 * (ie clustered apic addressing mode), this is a LOGICAL apic ID.
Ingo Molnar1f5bcab2009-02-26 13:51:40 +0100677 * Returns zero if CPU booted OK, else error code from
678 * ->wakeup_secondary_cpu.
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300679 */
Ingo Molnarab6fb7c2009-02-17 16:22:09 +0100680static int __cpuinit do_boot_cpu(int apicid, int cpu)
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300681{
682 unsigned long boot_error = 0;
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300683 unsigned long start_ip;
Ingo Molnarab6fb7c2009-02-17 16:22:09 +0100684 int timeout;
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300685 struct create_idle c_idle = {
Ingo Molnarab6fb7c2009-02-17 16:22:09 +0100686 .cpu = cpu,
687 .done = COMPLETION_INITIALIZER_ONSTACK(c_idle.done),
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300688 };
Ingo Molnarab6fb7c2009-02-17 16:22:09 +0100689
Thomas Gleixnerdc186ad2009-11-16 01:09:48 +0900690 INIT_WORK_ON_STACK(&c_idle.work, do_fork_idle);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300691
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300692 alternatives_smp_switch(1);
693
694 c_idle.idle = get_idle_for_cpu(cpu);
695
696 /*
697 * We can't use kernel_thread since we must avoid to
698 * reschedule the child.
699 */
700 if (c_idle.idle) {
701 c_idle.idle->thread.sp = (unsigned long) (((struct pt_regs *)
702 (THREAD_SIZE + task_stack_page(c_idle.idle))) - 1);
703 init_idle(c_idle.idle, cpu);
704 goto do_rest;
705 }
706
707 if (!keventd_up() || current_is_keventd())
708 c_idle.work.func(&c_idle.work);
709 else {
710 schedule_work(&c_idle.work);
711 wait_for_completion(&c_idle.done);
712 }
713
714 if (IS_ERR(c_idle.idle)) {
715 printk("failed fork for CPU %d\n", cpu);
Thomas Gleixnerdc186ad2009-11-16 01:09:48 +0900716 destroy_work_on_stack(&c_idle.work);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300717 return PTR_ERR(c_idle.idle);
718 }
719
720 set_idle_for_cpu(cpu, c_idle.idle);
721do_rest:
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300722 per_cpu(current_task, cpu) = c_idle.idle;
Brian Gerstc6f5e0a2009-01-19 00:38:58 +0900723#ifdef CONFIG_X86_32
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300724 /* Stack for startup_32 can be just as for start_secondary onwards */
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300725 irq_ctx_init(cpu);
726#else
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300727 clear_tsk_thread_flag(c_idle.idle, TIF_FORK);
Tejun Heo004aa322009-01-13 20:41:35 +0900728 initial_gs = per_cpu_offset(cpu);
Brian Gerst9af45652009-01-19 00:38:58 +0900729 per_cpu(kernel_stack, cpu) =
730 (unsigned long)task_stack_page(c_idle.idle) -
731 KERNEL_STACK_OFFSET + THREAD_SIZE;
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300732#endif
Glauber Costaa9390982008-05-28 16:19:53 -0700733 early_gdt_descr.address = (unsigned long)get_cpu_gdt_table(cpu);
Glauber Costa3e970472008-05-28 13:01:54 -0300734 initial_code = (unsigned long)start_secondary;
Glauber Costa9cf4f292008-05-27 18:22:54 -0700735 stack_start.sp = (void *) c_idle.idle->thread.sp;
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300736
737 /* start_ip had better be page-aligned! */
738 start_ip = setup_trampoline();
739
740 /* So we see what's up */
Yinghai Lu823b2592008-09-10 21:56:46 -0700741 printk(KERN_INFO "Booting processor %d APIC 0x%x ip 0x%lx\n",
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300742 cpu, apicid, start_ip);
743
744 /*
745 * This grunge runs the startup process for
746 * the targeted processor.
747 */
748
749 atomic_set(&init_deasserted, 0);
750
Jack Steiner34d05592008-04-16 11:45:15 -0500751 if (get_uv_system_type() != UV_NON_UNIQUE_APIC) {
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300752
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200753 pr_debug("Setting warm reset code and vector.\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300754
Jack Steiner34d05592008-04-16 11:45:15 -0500755 smpboot_setup_warm_reset_vector(start_ip);
756 /*
757 * Be paranoid about clearing APIC errors.
Cyrill Gorcunovdb96b0a2008-10-22 18:00:09 +0400758 */
759 if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) {
760 apic_write(APIC_ESR, 0);
761 apic_read(APIC_ESR);
762 }
Jack Steiner34d05592008-04-16 11:45:15 -0500763 }
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300764
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300765 /*
Ingo Molnar1f5bcab2009-02-26 13:51:40 +0100766 * Kick the secondary CPU. Use the method in the APIC driver
767 * if it's defined - or use an INIT boot APIC message otherwise:
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300768 */
Ingo Molnar1f5bcab2009-02-26 13:51:40 +0100769 if (apic->wakeup_secondary_cpu)
770 boot_error = apic->wakeup_secondary_cpu(apicid, start_ip);
771 else
772 boot_error = wakeup_secondary_cpu_via_init(apicid, start_ip);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300773
774 if (!boot_error) {
775 /*
776 * allow APs to start initializing.
777 */
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200778 pr_debug("Before Callout %d.\n", cpu);
Mike Travisc2d1cec2009-01-04 05:18:03 -0800779 cpumask_set_cpu(cpu, cpu_callout_mask);
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200780 pr_debug("After Callout %d.\n", cpu);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300781
782 /*
783 * Wait 5s total for a response
784 */
785 for (timeout = 0; timeout < 50000; timeout++) {
Mike Travisc2d1cec2009-01-04 05:18:03 -0800786 if (cpumask_test_cpu(cpu, cpu_callin_mask))
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300787 break; /* It has booted */
788 udelay(100);
789 }
790
Mike Travisc2d1cec2009-01-04 05:18:03 -0800791 if (cpumask_test_cpu(cpu, cpu_callin_mask)) {
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300792 /* number CPUs logically, starting from 1 (BSP is 0) */
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200793 pr_debug("OK.\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300794 printk(KERN_INFO "CPU%d: ", cpu);
795 print_cpu_info(&cpu_data(cpu));
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200796 pr_debug("CPU has booted.\n");
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300797 } else {
798 boot_error = 1;
799 if (*((volatile unsigned char *)trampoline_base)
800 == 0xA5)
801 /* trampoline started but...? */
802 printk(KERN_ERR "Stuck ??\n");
803 else
804 /* trampoline code not run */
805 printk(KERN_ERR "Not responding.\n");
Ingo Molnar25dc0042009-01-28 16:31:52 +0100806 if (apic->inquire_remote_apic)
807 apic->inquire_remote_apic(apicid);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300808 }
809 }
Tejun Heo1a51e3a2009-01-13 20:41:35 +0900810
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300811 if (boot_error) {
812 /* Try to put things back the way they were before ... */
Mike Travis23ca4bb2008-05-12 21:21:12 +0200813 numa_remove_cpu(cpu); /* was set by numa_add_cpu */
Mike Travisc2d1cec2009-01-04 05:18:03 -0800814
815 /* was set by do_boot_cpu() */
816 cpumask_clear_cpu(cpu, cpu_callout_mask);
817
818 /* was set by cpu_init() */
819 cpumask_clear_cpu(cpu, cpu_initialized_mask);
820
821 set_cpu_present(cpu, false);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300822 per_cpu(x86_cpu_to_apicid, cpu) = BAD_APICID;
823 }
824
825 /* mark "stuck" area as not stuck */
826 *((volatile unsigned long *)trampoline_base) = 0;
827
Yinghai Lu02421f92009-04-03 17:15:53 -0700828 if (get_uv_system_type() != UV_NON_UNIQUE_APIC) {
829 /*
830 * Cleanup possible dangling ends...
831 */
832 smpboot_restore_warm_reset_vector();
833 }
Alok Kataria63d38192008-04-07 11:38:33 -0700834
Thomas Gleixnerdc186ad2009-11-16 01:09:48 +0900835 destroy_work_on_stack(&c_idle.work);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300836 return boot_error;
837}
838
839int __cpuinit native_cpu_up(unsigned int cpu)
840{
Ingo Molnara21769a42009-01-28 06:50:47 +0100841 int apicid = apic->cpu_present_to_apicid(cpu);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300842 unsigned long flags;
843 int err;
844
845 WARN_ON(irqs_disabled());
846
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200847 pr_debug("++++++++++++++++++++=_---CPU UP %u\n", cpu);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300848
849 if (apicid == BAD_APICID || apicid == boot_cpu_physical_apicid ||
850 !physid_isset(apicid, phys_cpu_present_map)) {
851 printk(KERN_ERR "%s: bad cpu %d\n", __func__, cpu);
852 return -EINVAL;
853 }
854
855 /*
856 * Already booted CPU?
857 */
Mike Travisc2d1cec2009-01-04 05:18:03 -0800858 if (cpumask_test_cpu(cpu, cpu_callin_mask)) {
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200859 pr_debug("do_boot_cpu %d Already started\n", cpu);
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300860 return -ENOSYS;
861 }
862
863 /*
864 * Save current MTRR state in case it was changed since early boot
865 * (e.g. by the ACPI SMI) to initialize new CPUs with MTRRs in sync:
866 */
867 mtrr_save_state();
868
869 per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
870
871#ifdef CONFIG_X86_32
872 /* init low mem mapping */
Jeremy Fitzhardinge68db0652008-03-17 16:37:13 -0700873 clone_pgd_range(swapper_pg_dir, swapper_pg_dir + KERNEL_PGD_BOUNDARY,
Hugh Dickins61165d72008-05-13 14:26:57 +0100874 min_t(unsigned long, KERNEL_PGD_PTRS, KERNEL_PGD_BOUNDARY));
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300875 flush_tlb_all();
Hugh Dickins61165d72008-05-13 14:26:57 +0100876 low_mappings = 1;
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300877
878 err = do_boot_cpu(apicid, cpu);
Hugh Dickins61165d72008-05-13 14:26:57 +0100879
Yinghai Lu55cd6362009-06-12 11:36:52 +0300880 zap_low_mappings(false);
Hugh Dickins61165d72008-05-13 14:26:57 +0100881 low_mappings = 0;
882#else
883 err = do_boot_cpu(apicid, cpu);
884#endif
885 if (err) {
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +0200886 pr_debug("do_boot_cpu failed %d\n", err);
Hugh Dickins61165d72008-05-13 14:26:57 +0100887 return -EIO;
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300888 }
889
890 /*
891 * Check TSC synchronization with the AP (keep irqs disabled
892 * while doing so):
893 */
894 local_irq_save(flags);
895 check_tsc_sync_source(cpu);
896 local_irq_restore(flags);
897
Akinobu Mita7c04e642008-04-19 23:55:17 +0900898 while (!cpu_online(cpu)) {
Glauber de Oliveira Costacb3c8b92008-03-19 14:25:59 -0300899 cpu_relax();
900 touch_nmi_watchdog();
901 }
902
903 return 0;
904}
905
Glauber de Oliveira Costaa8db8452008-03-19 14:26:01 -0300906/*
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -0300907 * Fall back to non SMP mode after errors.
908 *
909 * RED-PEN audit/test this more. I bet there is more state messed up here.
910 */
911static __init void disable_smp(void)
912{
Rusty Russell4f062892009-03-13 14:49:54 +1030913 init_cpu_present(cpumask_of(0));
914 init_cpu_possible(cpumask_of(0));
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -0300915 smpboot_clear_io_apic_irqs();
Glauber Costa0f385d12008-05-28 17:09:53 -0700916
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -0300917 if (smp_found_config)
Jack Steinerb6df1b82008-06-19 21:51:05 -0500918 physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map);
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -0300919 else
Jack Steinerb6df1b82008-06-19 21:51:05 -0500920 physid_set_mask_of_physid(0, &phys_cpu_present_map);
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -0300921 map_cpu_to_logical_apicid();
Mike Travisc2d1cec2009-01-04 05:18:03 -0800922 cpumask_set_cpu(0, cpu_sibling_mask(0));
923 cpumask_set_cpu(0, cpu_core_mask(0));
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -0300924}
925
926/*
927 * Various sanity checks.
928 */
929static int __init smp_sanity_check(unsigned max_cpus)
930{
Jack Steinerac23d4e2008-03-28 14:12:16 -0500931 preempt_disable();
Yinghai Lua58f03b2008-08-14 02:16:30 -0700932
Yinghai Lu1ff2f202009-01-29 19:30:04 -0800933#if !defined(CONFIG_X86_BIGSMP) && defined(CONFIG_X86_32)
Yinghai Lua58f03b2008-08-14 02:16:30 -0700934 if (def_to_bigsmp && nr_cpu_ids > 8) {
935 unsigned int cpu;
936 unsigned nr;
937
938 printk(KERN_WARNING
939 "More than 8 CPUs detected - skipping them.\n"
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800940 "Use CONFIG_X86_BIGSMP.\n");
Yinghai Lua58f03b2008-08-14 02:16:30 -0700941
942 nr = 0;
943 for_each_present_cpu(cpu) {
944 if (nr >= 8)
Mike Travisc2d1cec2009-01-04 05:18:03 -0800945 set_cpu_present(cpu, false);
Yinghai Lua58f03b2008-08-14 02:16:30 -0700946 nr++;
947 }
948
949 nr = 0;
950 for_each_possible_cpu(cpu) {
951 if (nr >= 8)
Mike Travisc2d1cec2009-01-04 05:18:03 -0800952 set_cpu_possible(cpu, false);
Yinghai Lua58f03b2008-08-14 02:16:30 -0700953 nr++;
954 }
955
956 nr_cpu_ids = 8;
957 }
958#endif
959
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -0300960 if (!physid_isset(hard_smp_processor_id(), phys_cpu_present_map)) {
Michael Tokarev55c395b2008-12-05 14:42:20 +0300961 printk(KERN_WARNING
962 "weird, boot CPU (#%d) not listed by the BIOS.\n",
963 hard_smp_processor_id());
964
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -0300965 physid_set(hard_smp_processor_id(), phys_cpu_present_map);
966 }
967
968 /*
969 * If we couldn't find an SMP configuration at boot time,
970 * get out of here now!
971 */
972 if (!smp_found_config && !acpi_lapic) {
Jack Steinerac23d4e2008-03-28 14:12:16 -0500973 preempt_enable();
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -0300974 printk(KERN_NOTICE "SMP motherboard not detected.\n");
975 disable_smp();
976 if (APIC_init_uniprocessor())
977 printk(KERN_NOTICE "Local APIC not detected."
978 " Using dummy APIC emulation.\n");
979 return -1;
980 }
981
982 /*
983 * Should not be necessary because the MP table should list the boot
984 * CPU too, but we do it for the sake of robustness anyway.
985 */
Ingo Molnara27a6212009-01-28 12:43:18 +0100986 if (!apic->check_phys_apicid_present(boot_cpu_physical_apicid)) {
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -0300987 printk(KERN_NOTICE
988 "weird, boot CPU (#%d) not listed by the BIOS.\n",
989 boot_cpu_physical_apicid);
990 physid_set(hard_smp_processor_id(), phys_cpu_present_map);
991 }
Jack Steinerac23d4e2008-03-28 14:12:16 -0500992 preempt_enable();
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -0300993
994 /*
995 * If we couldn't find a local APIC, then get out of here now!
996 */
997 if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid]) &&
998 !cpu_has_apic) {
Cyrill Gorcunov103428e2009-06-07 16:48:40 +0400999 if (!disable_apic) {
1000 pr_err("BIOS bug, local APIC #%d not detected!...\n",
1001 boot_cpu_physical_apicid);
1002 pr_err("... forcing use of dummy APIC emulation."
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001003 "(tell your hw vendor)\n");
Cyrill Gorcunov103428e2009-06-07 16:48:40 +04001004 }
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001005 smpboot_clear_io_apic();
Ingo Molnar65a4e572009-01-31 03:36:17 +01001006 arch_disable_smp_support();
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001007 return -1;
1008 }
1009
1010 verify_local_APIC();
1011
1012 /*
1013 * If SMP should be disabled, then really disable it!
1014 */
1015 if (!max_cpus) {
Maciej W. Rozycki73d08e62008-05-21 22:09:43 +01001016 printk(KERN_INFO "SMP mode deactivated.\n");
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001017 smpboot_clear_io_apic();
Maciej W. Rozyckid54db1a2008-06-06 03:28:02 +01001018
1019 localise_nmi_watchdog();
1020
Jesse Barnese90955c2008-04-21 14:14:44 -07001021 connect_bsp_APIC();
Jesse Barnese90955c2008-04-21 14:14:44 -07001022 setup_local_APIC();
1023 end_local_APIC_setup();
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001024 return -1;
1025 }
1026
1027 return 0;
1028}
1029
1030static void __init smp_cpu_index_default(void)
1031{
1032 int i;
1033 struct cpuinfo_x86 *c;
1034
Akinobu Mita7c04e642008-04-19 23:55:17 +09001035 for_each_possible_cpu(i) {
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001036 c = &cpu_data(i);
1037 /* mark all to hotplug */
Mike Travis96289372008-12-31 18:08:46 -08001038 c->cpu_index = nr_cpu_ids;
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001039 }
1040}
1041
1042/*
1043 * Prepare for SMP bootup. The MP table or ACPI has been read
1044 * earlier. Just do some sanity checking here and enable APIC mode.
1045 */
1046void __init native_smp_prepare_cpus(unsigned int max_cpus)
1047{
Rusty Russell7ad728f2009-03-13 14:49:50 +10301048 unsigned int i;
1049
Ingo Molnardeef3252008-05-12 15:44:38 +02001050 preempt_disable();
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001051 smp_cpu_index_default();
1052 current_cpu_data = boot_cpu_data;
Mike Travisc2d1cec2009-01-04 05:18:03 -08001053 cpumask_copy(cpu_callin_mask, cpumask_of(0));
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001054 mb();
1055 /*
1056 * Setup boot CPU information
1057 */
1058 smp_store_cpu_info(0); /* Final full version of the data */
Suresh Siddha1b374e42008-07-10 11:16:49 -07001059#ifdef CONFIG_X86_32
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001060 boot_cpu_logical_apicid = logical_smp_processor_id();
Suresh Siddha1b374e42008-07-10 11:16:49 -07001061#endif
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001062 current_thread_info()->cpu = 0; /* needed? */
Rusty Russell7ad728f2009-03-13 14:49:50 +10301063 for_each_possible_cpu(i) {
Li Zefan79f55992009-06-15 14:58:26 +08001064 zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
1065 zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
1066 zalloc_cpumask_var(&cpu_data(i).llc_shared_map, GFP_KERNEL);
Rusty Russell7ad728f2009-03-13 14:49:50 +10301067 }
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001068 set_cpu_sibling_map(0);
1069
Suresh Siddha6e1cb382008-07-10 11:16:58 -07001070 enable_IR_x2apic();
Yinghai Lu06cd9a72009-02-16 17:29:58 -08001071#ifdef CONFIG_X86_64
Ingo Molnar72ce0162009-01-28 06:50:47 +01001072 default_setup_apic_routing();
Suresh Siddha6e1cb382008-07-10 11:16:58 -07001073#endif
1074
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001075 if (smp_sanity_check(max_cpus) < 0) {
1076 printk(KERN_INFO "SMP disabled\n");
1077 disable_smp();
Ingo Molnardeef3252008-05-12 15:44:38 +02001078 goto out;
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001079 }
1080
Jack Steinerac23d4e2008-03-28 14:12:16 -05001081 preempt_disable();
Yinghai Lu4c9961d2008-07-11 18:44:16 -07001082 if (read_apic_id() != boot_cpu_physical_apicid) {
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001083 panic("Boot APIC ID in local APIC unexpected (%d vs %d)",
Yinghai Lu4c9961d2008-07-11 18:44:16 -07001084 read_apic_id(), boot_cpu_physical_apicid);
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001085 /* Or can we switch back to PIC here? */
1086 }
Jack Steinerac23d4e2008-03-28 14:12:16 -05001087 preempt_enable();
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001088
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001089 connect_bsp_APIC();
Glauber Costab5841762008-05-28 13:38:28 -03001090
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001091 /*
1092 * Switch from PIC to APIC mode.
1093 */
1094 setup_local_APIC();
1095
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001096 /*
1097 * Enable IO APIC before setting up error vector
1098 */
1099 if (!skip_ioapic_setup && nr_ioapics)
1100 enable_IO_APIC();
Yinghai Lu88d0f552009-02-14 23:57:28 -08001101
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001102 end_local_APIC_setup();
1103
1104 map_cpu_to_logical_apicid();
1105
Ingo Molnard83093b2009-01-28 12:43:18 +01001106 if (apic->setup_portio_remap)
1107 apic->setup_portio_remap();
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001108
1109 smpboot_setup_io_apic();
1110 /*
1111 * Set up local APIC timer on boot CPU.
1112 */
1113
1114 printk(KERN_INFO "CPU%d: ", 0);
1115 print_cpu_info(&cpu_data(0));
Thomas Gleixner736deca2009-08-19 12:35:53 +02001116 x86_init.timers.setup_percpu_clockev();
Marcin Slusarzc4bd1fd2008-08-21 20:49:05 +02001117
1118 if (is_uv_system())
1119 uv_system_init();
Suresh Siddhad0af9ee2009-08-19 18:05:36 -07001120
1121 set_mtrr_aps_delayed_init();
Ingo Molnardeef3252008-05-12 15:44:38 +02001122out:
1123 preempt_enable();
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001124}
Suresh Siddhad0af9ee2009-08-19 18:05:36 -07001125
1126void arch_enable_nonboot_cpus_begin(void)
1127{
1128 set_mtrr_aps_delayed_init();
1129}
1130
1131void arch_enable_nonboot_cpus_end(void)
1132{
1133 mtrr_aps_init();
1134}
1135
Glauber de Oliveira Costa8aef1352008-03-19 14:26:11 -03001136/*
Glauber de Oliveira Costaa8db8452008-03-19 14:26:01 -03001137 * Early setup to make printk work.
1138 */
1139void __init native_smp_prepare_boot_cpu(void)
1140{
1141 int me = smp_processor_id();
Brian Gerst552be872009-01-30 17:47:53 +09001142 switch_to_new_gdt(me);
Mike Travisc2d1cec2009-01-04 05:18:03 -08001143 /* already set me in cpu_online_mask in boot_cpu_init() */
1144 cpumask_set_cpu(me, cpu_callout_mask);
Glauber de Oliveira Costaa8db8452008-03-19 14:26:01 -03001145 per_cpu(cpu_state, me) = CPU_ONLINE;
1146}
1147
Glauber de Oliveira Costa83f7eb92008-03-19 14:26:02 -03001148void __init native_smp_cpus_done(unsigned int max_cpus)
1149{
Thomas Gleixnercfc1b9a2008-07-21 21:35:38 +02001150 pr_debug("Boot done.\n");
Glauber de Oliveira Costa83f7eb92008-03-19 14:26:02 -03001151
1152 impress_friends();
Glauber de Oliveira Costa83f7eb92008-03-19 14:26:02 -03001153#ifdef CONFIG_X86_IO_APIC
1154 setup_ioapic_dest();
1155#endif
1156 check_nmi_watchdog();
Suresh Siddhad0af9ee2009-08-19 18:05:36 -07001157 mtrr_aps_init();
Glauber de Oliveira Costa83f7eb92008-03-19 14:26:02 -03001158}
1159
Mike Travis3b11ce72008-12-17 15:21:39 -08001160static int __initdata setup_possible_cpus = -1;
1161static int __init _setup_possible_cpus(char *str)
1162{
1163 get_option(&str, &setup_possible_cpus);
1164 return 0;
1165}
1166early_param("possible_cpus", _setup_possible_cpus);
1167
1168
Glauber Costa68a1c3f2008-03-03 14:12:42 -03001169/*
Rusty Russell4f062892009-03-13 14:49:54 +10301170 * cpu_possible_mask should be static, it cannot change as cpu's
Glauber Costa68a1c3f2008-03-03 14:12:42 -03001171 * are onlined, or offlined. The reason is per-cpu data-structures
1172 * are allocated by some modules at init time, and dont expect to
1173 * do this dynamically on cpu arrival/departure.
Rusty Russell4f062892009-03-13 14:49:54 +10301174 * cpu_present_mask on the other hand can change dynamically.
Glauber Costa68a1c3f2008-03-03 14:12:42 -03001175 * In case when cpu_hotplug is not compiled, then we resort to current
1176 * behaviour, which is cpu_possible == cpu_present.
1177 * - Ashok Raj
1178 *
1179 * Three ways to find out the number of additional hotplug CPUs:
1180 * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
Mike Travis3b11ce72008-12-17 15:21:39 -08001181 * - The user can overwrite it with possible_cpus=NUM
Glauber Costa68a1c3f2008-03-03 14:12:42 -03001182 * - Otherwise don't reserve additional CPUs.
1183 * We do this because additional CPUs waste a lot of memory.
1184 * -AK
1185 */
1186__init void prefill_possible_map(void)
1187{
Thomas Gleixnercb48bb52008-10-05 17:51:52 +02001188 int i, possible;
Glauber Costa68a1c3f2008-03-03 14:12:42 -03001189
Yinghai Lu329513a2008-07-02 18:54:40 -07001190 /* no processor from mptable or madt */
1191 if (!num_processors)
1192 num_processors = 1;
1193
Mike Travis3b11ce72008-12-17 15:21:39 -08001194 if (setup_possible_cpus == -1)
1195 possible = num_processors + disabled_cpus;
1196 else
1197 possible = setup_possible_cpus;
1198
Mike Travis730cf272008-12-31 18:08:45 -08001199 total_cpus = max_t(int, possible, num_processors + disabled_cpus);
1200
Mike Travis3b11ce72008-12-17 15:21:39 -08001201 if (possible > CONFIG_NR_CPUS) {
1202 printk(KERN_WARNING
1203 "%d Processors exceeds NR_CPUS limit of %d\n",
1204 possible, CONFIG_NR_CPUS);
1205 possible = CONFIG_NR_CPUS;
1206 }
Glauber Costa68a1c3f2008-03-03 14:12:42 -03001207
1208 printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
1209 possible, max_t(int, possible - num_processors, 0));
1210
1211 for (i = 0; i < possible; i++)
Mike Travisc2d1cec2009-01-04 05:18:03 -08001212 set_cpu_possible(i, true);
Mike Travis3461b0a2008-05-12 21:21:13 +02001213
1214 nr_cpu_ids = possible;
Glauber Costa68a1c3f2008-03-03 14:12:42 -03001215}
Glauber Costa69c18c12008-03-03 14:13:07 -03001216
Chuck Ebbert14adf852008-09-29 18:29:42 -04001217#ifdef CONFIG_HOTPLUG_CPU
1218
1219static void remove_siblinginfo(int cpu)
1220{
1221 int sibling;
1222 struct cpuinfo_x86 *c = &cpu_data(cpu);
1223
Mike Travisc2d1cec2009-01-04 05:18:03 -08001224 for_each_cpu(sibling, cpu_core_mask(cpu)) {
1225 cpumask_clear_cpu(cpu, cpu_core_mask(sibling));
Chuck Ebbert14adf852008-09-29 18:29:42 -04001226 /*/
1227 * last thread sibling in this cpu core going down
1228 */
Mike Travisc2d1cec2009-01-04 05:18:03 -08001229 if (cpumask_weight(cpu_sibling_mask(cpu)) == 1)
Chuck Ebbert14adf852008-09-29 18:29:42 -04001230 cpu_data(sibling).booted_cores--;
1231 }
1232
Mike Travisc2d1cec2009-01-04 05:18:03 -08001233 for_each_cpu(sibling, cpu_sibling_mask(cpu))
1234 cpumask_clear_cpu(cpu, cpu_sibling_mask(sibling));
1235 cpumask_clear(cpu_sibling_mask(cpu));
1236 cpumask_clear(cpu_core_mask(cpu));
Chuck Ebbert14adf852008-09-29 18:29:42 -04001237 c->phys_proc_id = 0;
1238 c->cpu_core_id = 0;
Mike Travisc2d1cec2009-01-04 05:18:03 -08001239 cpumask_clear_cpu(cpu, cpu_sibling_setup_mask);
Chuck Ebbert14adf852008-09-29 18:29:42 -04001240}
1241
Glauber Costa69c18c12008-03-03 14:13:07 -03001242static void __ref remove_cpu_from_maps(int cpu)
1243{
Mike Travisc2d1cec2009-01-04 05:18:03 -08001244 set_cpu_online(cpu, false);
1245 cpumask_clear_cpu(cpu, cpu_callout_mask);
1246 cpumask_clear_cpu(cpu, cpu_callin_mask);
Glauber Costa69c18c12008-03-03 14:13:07 -03001247 /* was set by cpu_init() */
Mike Travisc2d1cec2009-01-04 05:18:03 -08001248 cpumask_clear_cpu(cpu, cpu_initialized_mask);
Mike Travis23ca4bb2008-05-12 21:21:12 +02001249 numa_remove_cpu(cpu);
Glauber Costa69c18c12008-03-03 14:13:07 -03001250}
1251
Alex Nixon8227dce2008-08-22 11:52:14 +01001252void cpu_disable_common(void)
1253{
1254 int cpu = smp_processor_id();
1255 /*
1256 * HACK:
1257 * Allow any queued timer interrupts to get serviced
1258 * This is only a temporary solution until we cleanup
1259 * fixup_irqs as we do for IA64.
1260 */
1261 local_irq_enable();
1262 mdelay(1);
1263
1264 local_irq_disable();
1265 remove_siblinginfo(cpu);
1266
1267 /* It's now safe to remove this processor from the online map */
1268 lock_vector_lock();
1269 remove_cpu_from_maps(cpu);
1270 unlock_vector_lock();
Mike Travisd7b381b2008-12-16 17:33:58 -08001271 fixup_irqs();
Alex Nixon8227dce2008-08-22 11:52:14 +01001272}
1273
Alex Nixon93be71b2008-08-22 11:52:11 +01001274int native_cpu_disable(void)
Glauber Costa69c18c12008-03-03 14:13:07 -03001275{
1276 int cpu = smp_processor_id();
1277
1278 /*
1279 * Perhaps use cpufreq to drop frequency, but that could go
1280 * into generic code.
1281 *
1282 * We won't take down the boot processor on i386 due to some
1283 * interrupts only being able to be serviced by the BSP.
1284 * Especially so if we're not using an IOAPIC -zwane
1285 */
1286 if (cpu == 0)
1287 return -EBUSY;
1288
1289 if (nmi_watchdog == NMI_LOCAL_APIC)
1290 stop_apic_nmi_watchdog(NULL);
1291 clear_local_APIC();
1292
Alex Nixon8227dce2008-08-22 11:52:14 +01001293 cpu_disable_common();
Glauber Costa69c18c12008-03-03 14:13:07 -03001294 return 0;
1295}
1296
Alex Nixon93be71b2008-08-22 11:52:11 +01001297void native_cpu_die(unsigned int cpu)
Glauber Costa69c18c12008-03-03 14:13:07 -03001298{
1299 /* We don't do anything here: idle task is faking death itself. */
1300 unsigned int i;
1301
1302 for (i = 0; i < 10; i++) {
1303 /* They ack this in play_dead by setting CPU_DEAD */
1304 if (per_cpu(cpu_state, cpu) == CPU_DEAD) {
1305 printk(KERN_INFO "CPU %d is now offline\n", cpu);
1306 if (1 == num_online_cpus())
1307 alternatives_smp_switch(0);
1308 return;
1309 }
1310 msleep(100);
1311 }
1312 printk(KERN_ERR "CPU %u didn't die...\n", cpu);
1313}
Alex Nixona21f5d82008-08-22 11:52:13 +01001314
1315void play_dead_common(void)
1316{
1317 idle_task_exit();
1318 reset_lazy_tlbstate();
1319 irq_ctx_exit(raw_smp_processor_id());
Ingo Molnar07bbc162008-09-23 23:26:42 +02001320 c1e_remove_cpu(raw_smp_processor_id());
Alex Nixona21f5d82008-08-22 11:52:13 +01001321
1322 mb();
1323 /* Ack it */
1324 __get_cpu_var(cpu_state) = CPU_DEAD;
1325
1326 /*
1327 * With physical CPU hotplug, we should halt the cpu
1328 */
1329 local_irq_disable();
1330}
1331
1332void native_play_dead(void)
1333{
1334 play_dead_common();
Joseph Cihula86886e52009-06-30 19:31:07 -07001335 tboot_shutdown(TB_SHUTDOWN_WFS);
Alex Nixona21f5d82008-08-22 11:52:13 +01001336 wbinvd_halt();
1337}
1338
Glauber Costa69c18c12008-03-03 14:13:07 -03001339#else /* ... !CONFIG_HOTPLUG_CPU */
Alex Nixon93be71b2008-08-22 11:52:11 +01001340int native_cpu_disable(void)
Glauber Costa69c18c12008-03-03 14:13:07 -03001341{
1342 return -ENOSYS;
1343}
1344
Alex Nixon93be71b2008-08-22 11:52:11 +01001345void native_cpu_die(unsigned int cpu)
Glauber Costa69c18c12008-03-03 14:13:07 -03001346{
1347 /* We said "no" in __cpu_disable */
1348 BUG();
1349}
Alex Nixona21f5d82008-08-22 11:52:13 +01001350
1351void native_play_dead(void)
1352{
1353 BUG();
1354}
1355
Glauber Costa68a1c3f2008-03-03 14:12:42 -03001356#endif