Commit | Line | Data |
---|---|---|
c767a54b | 1 | /* |
4cedb334 GOC |
2 | * x86 SMP booting functions |
3 | * | |
87c6fe26 | 4 | * (c) 1995 Alan Cox, Building #3 <alan@lxorguk.ukuu.org.uk> |
8f47e163 | 5 | * (c) 1998, 1999, 2000, 2009 Ingo Molnar <mingo@redhat.com> |
4cedb334 GOC |
6 | * Copyright 2001 Andi Kleen, SuSE Labs. |
7 | * | |
8 | * Much of the core SMP work is based on previous work by Thomas Radke, to | |
9 | * whom a great many thanks are extended. | |
10 | * | |
11 | * Thanks to Intel for making available several different Pentium, | |
12 | * Pentium Pro and Pentium-II/Xeon MP machines. | |
13 | * Original development of Linux SMP code supported by Caldera. | |
14 | * | |
15 | * This code is released under the GNU General Public License version 2 or | |
16 | * later. | |
17 | * | |
18 | * Fixes | |
19 | * Felix Koop : NR_CPUS used properly | |
20 | * Jose Renau : Handle single CPU case. | |
21 | * Alan Cox : By repeated request 8) - Total BogoMIPS report. | |
22 | * Greg Wright : Fix for kernel stacks panic. | |
23 | * Erich Boleyn : MP v1.4 and additional changes. | |
24 | * Matthias Sattler : Changes for 2.1 kernel map. | |
25 | * Michel Lespinasse : Changes for 2.1 kernel map. | |
26 | * Michael Chastain : Change trampoline.S to gnu as. | |
27 | * Alan Cox : Dumb bug: 'B' step PPro's are fine | |
28 | * Ingo Molnar : Added APIC timers, based on code | |
29 | * from Jose Renau | |
30 | * Ingo Molnar : various cleanups and rewrites | |
31 | * Tigran Aivazian : fixed "0.00 in /proc/uptime on SMP" bug. | |
32 | * Maciej W. Rozycki : Bits for genuine 82489DX APICs | |
33 | * Andi Kleen : Changed for SMP boot into long mode. | |
34 | * Martin J. Bligh : Added support for multi-quad systems | |
35 | * Dave Jones : Report invalid combinations of Athlon CPUs. | |
36 | * Rusty Russell : Hacked into shape for new "hotplug" boot process. | |
37 | * Andi Kleen : Converted to new state machine. | |
38 | * Ashok Raj : CPU hotplug support | |
39 | * Glauber Costa : i386 and x86_64 integration | |
40 | */ | |
41 | ||
c767a54b JP |
42 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
43 | ||
68a1c3f8 GC |
44 | #include <linux/init.h> |
45 | #include <linux/smp.h> | |
a355352b | 46 | #include <linux/module.h> |
70708a18 | 47 | #include <linux/sched.h> |
69c18c15 | 48 | #include <linux/percpu.h> |
91718e8d | 49 | #include <linux/bootmem.h> |
cb3c8b90 GOC |
50 | #include <linux/err.h> |
51 | #include <linux/nmi.h> | |
69575d38 | 52 | #include <linux/tboot.h> |
35f720c5 | 53 | #include <linux/stackprotector.h> |
5a0e3ad6 | 54 | #include <linux/gfp.h> |
1a022e3f | 55 | #include <linux/cpuidle.h> |
69c18c15 | 56 | |
8aef135c | 57 | #include <asm/acpi.h> |
cb3c8b90 | 58 | #include <asm/desc.h> |
69c18c15 GC |
59 | #include <asm/nmi.h> |
60 | #include <asm/irq.h> | |
07bbc16a | 61 | #include <asm/idle.h> |
48927bbb | 62 | #include <asm/realmode.h> |
69c18c15 GC |
63 | #include <asm/cpu.h> |
64 | #include <asm/numa.h> | |
cb3c8b90 GOC |
65 | #include <asm/pgtable.h> |
66 | #include <asm/tlbflush.h> | |
67 | #include <asm/mtrr.h> | |
ea530692 | 68 | #include <asm/mwait.h> |
7b6aa335 | 69 | #include <asm/apic.h> |
7167d08e | 70 | #include <asm/io_apic.h> |
78f7f1e5 | 71 | #include <asm/fpu/internal.h> |
569712b2 | 72 | #include <asm/setup.h> |
bdbcdd48 | 73 | #include <asm/uv/uv.h> |
cb3c8b90 | 74 | #include <linux/mc146818rtc.h> |
b81bb373 | 75 | #include <asm/i8259.h> |
48927bbb | 76 | #include <asm/realmode.h> |
646e29a1 | 77 | #include <asm/misc.h> |
48927bbb | 78 | |
a355352b GC |
79 | /* Number of siblings per CPU package */ |
80 | int smp_num_siblings = 1; | |
81 | EXPORT_SYMBOL(smp_num_siblings); | |
82 | ||
83 | /* Last level cache ID of each logical CPU */ | |
0816b0f0 | 84 | DEFINE_PER_CPU_READ_MOSTLY(u16, cpu_llc_id) = BAD_APICID; |
a355352b | 85 | |
a355352b | 86 | /* representing HT siblings of each logical CPU */ |
0816b0f0 | 87 | DEFINE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_sibling_map); |
a355352b GC |
88 | EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); |
89 | ||
90 | /* representing HT and core siblings of each logical CPU */ | |
0816b0f0 | 91 | DEFINE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_core_map); |
a355352b GC |
92 | EXPORT_PER_CPU_SYMBOL(cpu_core_map); |
93 | ||
0816b0f0 | 94 | DEFINE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_llc_shared_map); |
b3d7336d | 95 | |
a355352b | 96 | /* Per CPU bogomips and other parameters */ |
2c773dd3 | 97 | DEFINE_PER_CPU_READ_MOSTLY(struct cpuinfo_x86, cpu_info); |
a355352b | 98 | EXPORT_PER_CPU_SYMBOL(cpu_info); |
768d9505 | 99 | |
1f12e32f TG |
100 | /* Logical package management. We might want to allocate that dynamically */ |
101 | static int *physical_to_logical_pkg __read_mostly; | |
102 | static unsigned long *physical_package_map __read_mostly;; | |
103 | static unsigned long *logical_package_map __read_mostly; | |
104 | static unsigned int max_physical_pkg_id __read_mostly; | |
105 | unsigned int __max_logical_packages __read_mostly; | |
106 | EXPORT_SYMBOL(__max_logical_packages); | |
107 | ||
f77aa308 TG |
108 | static inline void smpboot_setup_warm_reset_vector(unsigned long start_eip) |
109 | { | |
110 | unsigned long flags; | |
111 | ||
112 | spin_lock_irqsave(&rtc_lock, flags); | |
113 | CMOS_WRITE(0xa, 0xf); | |
114 | spin_unlock_irqrestore(&rtc_lock, flags); | |
115 | local_flush_tlb(); | |
116 | pr_debug("1.\n"); | |
117 | *((volatile unsigned short *)phys_to_virt(TRAMPOLINE_PHYS_HIGH)) = | |
118 | start_eip >> 4; | |
119 | pr_debug("2.\n"); | |
120 | *((volatile unsigned short *)phys_to_virt(TRAMPOLINE_PHYS_LOW)) = | |
121 | start_eip & 0xf; | |
122 | pr_debug("3.\n"); | |
123 | } | |
124 | ||
125 | static inline void smpboot_restore_warm_reset_vector(void) | |
126 | { | |
127 | unsigned long flags; | |
128 | ||
129 | /* | |
130 | * Install writable page 0 entry to set BIOS data area. | |
131 | */ | |
132 | local_flush_tlb(); | |
133 | ||
134 | /* | |
135 | * Paranoid: Set warm reset code and vector here back | |
136 | * to default values. | |
137 | */ | |
138 | spin_lock_irqsave(&rtc_lock, flags); | |
139 | CMOS_WRITE(0, 0xf); | |
140 | spin_unlock_irqrestore(&rtc_lock, flags); | |
141 | ||
142 | *((volatile u32 *)phys_to_virt(TRAMPOLINE_PHYS_LOW)) = 0; | |
143 | } | |
144 | ||
cb3c8b90 | 145 | /* |
30106c17 FY |
146 | * Report back to the Boot Processor during boot time or to the caller processor |
147 | * during CPU online. | |
cb3c8b90 | 148 | */ |
148f9bb8 | 149 | static void smp_callin(void) |
cb3c8b90 GOC |
150 | { |
151 | int cpuid, phys_id; | |
cb3c8b90 GOC |
152 | |
153 | /* | |
154 | * If waken up by an INIT in an 82489DX configuration | |
656bba30 LB |
155 | * cpu_callout_mask guarantees we don't get here before |
156 | * an INIT_deassert IPI reaches our local APIC, so it is | |
157 | * now safe to touch our local APIC. | |
cb3c8b90 | 158 | */ |
e1c467e6 | 159 | cpuid = smp_processor_id(); |
cb3c8b90 GOC |
160 | |
161 | /* | |
162 | * (This works even if the APIC is not enabled.) | |
163 | */ | |
4c9961d5 | 164 | phys_id = read_apic_id(); |
cb3c8b90 GOC |
165 | |
166 | /* | |
167 | * the boot CPU has finished the init stage and is spinning | |
168 | * on callin_map until we finish. We are free to set up this | |
169 | * CPU, first the APIC. (this is probably redundant on most | |
170 | * boards) | |
171 | */ | |
05f7e46d | 172 | apic_ap_setup(); |
cb3c8b90 | 173 | |
b565201c JS |
174 | /* |
175 | * Save our processor parameters. Note: this information | |
176 | * is needed for clock calibration. | |
177 | */ | |
178 | smp_store_cpu_info(cpuid); | |
179 | ||
cb3c8b90 GOC |
180 | /* |
181 | * Get our bogomips. | |
b565201c JS |
182 | * Update loops_per_jiffy in cpu_data. Previous call to |
183 | * smp_store_cpu_info() stored a value that is close but not as | |
184 | * accurate as the value just calculated. | |
cb3c8b90 | 185 | */ |
cb3c8b90 | 186 | calibrate_delay(); |
b565201c | 187 | cpu_data(cpuid).loops_per_jiffy = loops_per_jiffy; |
cfc1b9a6 | 188 | pr_debug("Stack at about %p\n", &cpuid); |
cb3c8b90 | 189 | |
5ef428c4 AK |
190 | /* |
191 | * This must be done before setting cpu_online_mask | |
192 | * or calling notify_cpu_starting. | |
193 | */ | |
194 | set_cpu_sibling_map(raw_smp_processor_id()); | |
195 | wmb(); | |
196 | ||
85257024 PZ |
197 | notify_cpu_starting(cpuid); |
198 | ||
cb3c8b90 GOC |
199 | /* |
200 | * Allow the master to continue. | |
201 | */ | |
c2d1cec1 | 202 | cpumask_set_cpu(cpuid, cpu_callin_mask); |
cb3c8b90 GOC |
203 | } |
204 | ||
e1c467e6 FY |
205 | static int cpu0_logical_apicid; |
206 | static int enable_start_cpu0; | |
bbc2ff6a GOC |
207 | /* |
208 | * Activate a secondary processor. | |
209 | */ | |
148f9bb8 | 210 | static void notrace start_secondary(void *unused) |
bbc2ff6a GOC |
211 | { |
212 | /* | |
213 | * Don't put *anything* before cpu_init(), SMP booting is too | |
214 | * fragile that we want to limit the things done here to the | |
215 | * most necessary things. | |
216 | */ | |
b40827fa | 217 | cpu_init(); |
df156f90 | 218 | x86_cpuinit.early_percpu_clock_init(); |
b40827fa BP |
219 | preempt_disable(); |
220 | smp_callin(); | |
fd89a137 | 221 | |
e1c467e6 FY |
222 | enable_start_cpu0 = 0; |
223 | ||
fd89a137 | 224 | #ifdef CONFIG_X86_32 |
b40827fa | 225 | /* switch away from the initial page table */ |
fd89a137 JR |
226 | load_cr3(swapper_pg_dir); |
227 | __flush_tlb_all(); | |
228 | #endif | |
229 | ||
bbc2ff6a GOC |
230 | /* otherwise gcc will move up smp_processor_id before the cpu_init */ |
231 | barrier(); | |
232 | /* | |
233 | * Check TSC synchronization with the BP: | |
234 | */ | |
235 | check_tsc_sync_target(); | |
236 | ||
bbc2ff6a | 237 | /* |
5a3f75e3 TG |
238 | * Lock vector_lock and initialize the vectors on this cpu |
239 | * before setting the cpu online. We must set it online with | |
240 | * vector_lock held to prevent a concurrent setup/teardown | |
241 | * from seeing a half valid vector space. | |
bbc2ff6a | 242 | */ |
d388e5fd | 243 | lock_vector_lock(); |
5a3f75e3 | 244 | setup_vector_irq(smp_processor_id()); |
c2d1cec1 | 245 | set_cpu_online(smp_processor_id(), true); |
d388e5fd | 246 | unlock_vector_lock(); |
2a442c9c | 247 | cpu_set_state_online(smp_processor_id()); |
78c06176 | 248 | x86_platform.nmi_init(); |
bbc2ff6a | 249 | |
0cefa5b9 MS |
250 | /* enable local interrupts */ |
251 | local_irq_enable(); | |
252 | ||
35f720c5 JP |
253 | /* to prevent fake stack check failure in clock setup */ |
254 | boot_init_stack_canary(); | |
0cefa5b9 | 255 | |
736decac | 256 | x86_cpuinit.setup_percpu_clockev(); |
bbc2ff6a GOC |
257 | |
258 | wmb(); | |
fc6d73d6 | 259 | cpu_startup_entry(CPUHP_AP_ONLINE_IDLE); |
bbc2ff6a GOC |
260 | } |
261 | ||
1f12e32f TG |
262 | int topology_update_package_map(unsigned int apicid, unsigned int cpu) |
263 | { | |
264 | unsigned int new, pkg = apicid >> boot_cpu_data.x86_coreid_bits; | |
265 | ||
266 | /* Called from early boot ? */ | |
267 | if (!physical_package_map) | |
268 | return 0; | |
269 | ||
270 | if (pkg >= max_physical_pkg_id) | |
271 | return -EINVAL; | |
272 | ||
273 | /* Set the logical package id */ | |
274 | if (test_and_set_bit(pkg, physical_package_map)) | |
275 | goto found; | |
276 | ||
1f12e32f TG |
277 | new = find_first_zero_bit(logical_package_map, __max_logical_packages); |
278 | if (new >= __max_logical_packages) { | |
279 | physical_to_logical_pkg[pkg] = -1; | |
280 | pr_warn("APIC(%x) Package %u exceeds logical package map\n", | |
281 | apicid, pkg); | |
282 | return -ENOSPC; | |
283 | } | |
284 | set_bit(new, logical_package_map); | |
285 | pr_info("APIC(%x) Converting physical %u to logical package %u\n", | |
286 | apicid, pkg, new); | |
287 | physical_to_logical_pkg[pkg] = new; | |
288 | ||
289 | found: | |
290 | cpu_data(cpu).logical_proc_id = physical_to_logical_pkg[pkg]; | |
291 | return 0; | |
292 | } | |
293 | ||
294 | /** | |
295 | * topology_phys_to_logical_pkg - Map a physical package id to a logical | |
296 | * | |
297 | * Returns logical package id or -1 if not found | |
298 | */ | |
299 | int topology_phys_to_logical_pkg(unsigned int phys_pkg) | |
300 | { | |
301 | if (phys_pkg >= max_physical_pkg_id) | |
302 | return -1; | |
303 | return physical_to_logical_pkg[phys_pkg]; | |
304 | } | |
305 | EXPORT_SYMBOL(topology_phys_to_logical_pkg); | |
306 | ||
307 | static void __init smp_init_package_map(void) | |
308 | { | |
309 | unsigned int ncpus, cpu; | |
310 | size_t size; | |
311 | ||
312 | /* | |
313 | * Today neither Intel nor AMD support heterogenous systems. That | |
314 | * might change in the future.... | |
63d1e995 PZ |
315 | * |
316 | * While ideally we'd want '* smp_num_siblings' in the below @ncpus | |
317 | * computation, this won't actually work since some Intel BIOSes | |
318 | * report inconsistent HT data when they disable HT. | |
319 | * | |
320 | * In particular, they reduce the APIC-IDs to only include the cores, | |
321 | * but leave the CPUID topology to say there are (2) siblings. | |
322 | * This means we don't know how many threads there will be until | |
323 | * after the APIC enumeration. | |
324 | * | |
325 | * By not including this we'll sometimes over-estimate the number of | |
326 | * logical packages by the amount of !present siblings, but this is | |
327 | * still better than MAX_LOCAL_APIC. | |
3e8db224 TG |
328 | * |
329 | * We use total_cpus not nr_cpu_ids because nr_cpu_ids can be limited | |
330 | * on the command line leading to a similar issue as the HT disable | |
331 | * problem because the hyperthreads are usually enumerated after the | |
332 | * primary cores. | |
1f12e32f | 333 | */ |
63d1e995 | 334 | ncpus = boot_cpu_data.x86_max_cores; |
56402d63 TG |
335 | if (!ncpus) { |
336 | pr_warn("x86_max_cores == zero !?!?"); | |
337 | ncpus = 1; | |
338 | } | |
339 | ||
3e8db224 | 340 | __max_logical_packages = DIV_ROUND_UP(total_cpus, ncpus); |
1f12e32f TG |
341 | |
342 | /* | |
343 | * Possibly larger than what we need as the number of apic ids per | |
344 | * package can be smaller than the actual used apic ids. | |
345 | */ | |
346 | max_physical_pkg_id = DIV_ROUND_UP(MAX_LOCAL_APIC, ncpus); | |
347 | size = max_physical_pkg_id * sizeof(unsigned int); | |
348 | physical_to_logical_pkg = kmalloc(size, GFP_KERNEL); | |
349 | memset(physical_to_logical_pkg, 0xff, size); | |
350 | size = BITS_TO_LONGS(max_physical_pkg_id) * sizeof(unsigned long); | |
351 | physical_package_map = kzalloc(size, GFP_KERNEL); | |
352 | size = BITS_TO_LONGS(__max_logical_packages) * sizeof(unsigned long); | |
353 | logical_package_map = kzalloc(size, GFP_KERNEL); | |
354 | ||
355 | pr_info("Max logical packages: %u\n", __max_logical_packages); | |
356 | ||
357 | for_each_present_cpu(cpu) { | |
358 | unsigned int apicid = apic->cpu_present_to_apicid(cpu); | |
359 | ||
360 | if (apicid == BAD_APICID || !apic->apic_id_valid(apicid)) | |
361 | continue; | |
362 | if (!topology_update_package_map(apicid, cpu)) | |
363 | continue; | |
364 | pr_warn("CPU %u APICId %x disabled\n", cpu, apicid); | |
365 | per_cpu(x86_bios_cpu_apicid, cpu) = BAD_APICID; | |
366 | set_cpu_possible(cpu, false); | |
367 | set_cpu_present(cpu, false); | |
368 | } | |
369 | } | |
370 | ||
30106c17 FY |
371 | void __init smp_store_boot_cpu_info(void) |
372 | { | |
373 | int id = 0; /* CPU 0 */ | |
374 | struct cpuinfo_x86 *c = &cpu_data(id); | |
375 | ||
376 | *c = boot_cpu_data; | |
377 | c->cpu_index = id; | |
1f12e32f | 378 | smp_init_package_map(); |
30106c17 FY |
379 | } |
380 | ||
1d89a7f0 GOC |
381 | /* |
382 | * The bootstrap kernel entry code has set these up. Save them for | |
383 | * a given CPU | |
384 | */ | |
148f9bb8 | 385 | void smp_store_cpu_info(int id) |
1d89a7f0 GOC |
386 | { |
387 | struct cpuinfo_x86 *c = &cpu_data(id); | |
388 | ||
b3d7336d | 389 | *c = boot_cpu_data; |
1d89a7f0 | 390 | c->cpu_index = id; |
30106c17 FY |
391 | /* |
392 | * During boot time, CPU0 has this setup already. Save the info when | |
393 | * bringing up AP or offlined CPU0. | |
394 | */ | |
395 | identify_secondary_cpu(c); | |
1d89a7f0 GOC |
396 | } |
397 | ||
cebf15eb DH |
398 | static bool |
399 | topology_same_node(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o) | |
400 | { | |
401 | int cpu1 = c->cpu_index, cpu2 = o->cpu_index; | |
402 | ||
403 | return (cpu_to_node(cpu1) == cpu_to_node(cpu2)); | |
404 | } | |
405 | ||
148f9bb8 | 406 | static bool |
316ad248 | 407 | topology_sane(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o, const char *name) |
d4fbe4f0 | 408 | { |
316ad248 PZ |
409 | int cpu1 = c->cpu_index, cpu2 = o->cpu_index; |
410 | ||
cebf15eb | 411 | return !WARN_ONCE(!topology_same_node(c, o), |
316ad248 PZ |
412 | "sched: CPU #%d's %s-sibling CPU #%d is not on the same node! " |
413 | "[node: %d != %d]. Ignoring dependency.\n", | |
414 | cpu1, name, cpu2, cpu_to_node(cpu1), cpu_to_node(cpu2)); | |
415 | } | |
416 | ||
7d79a7bd | 417 | #define link_mask(mfunc, c1, c2) \ |
316ad248 | 418 | do { \ |
7d79a7bd BG |
419 | cpumask_set_cpu((c1), mfunc(c2)); \ |
420 | cpumask_set_cpu((c2), mfunc(c1)); \ | |
316ad248 PZ |
421 | } while (0) |
422 | ||
148f9bb8 | 423 | static bool match_smt(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o) |
316ad248 | 424 | { |
362f924b | 425 | if (boot_cpu_has(X86_FEATURE_TOPOEXT)) { |
316ad248 PZ |
426 | int cpu1 = c->cpu_index, cpu2 = o->cpu_index; |
427 | ||
428 | if (c->phys_proc_id == o->phys_proc_id && | |
429 | per_cpu(cpu_llc_id, cpu1) == per_cpu(cpu_llc_id, cpu2) && | |
8196dab4 | 430 | c->cpu_core_id == o->cpu_core_id) |
316ad248 PZ |
431 | return topology_sane(c, o, "smt"); |
432 | ||
433 | } else if (c->phys_proc_id == o->phys_proc_id && | |
434 | c->cpu_core_id == o->cpu_core_id) { | |
435 | return topology_sane(c, o, "smt"); | |
436 | } | |
437 | ||
438 | return false; | |
439 | } | |
440 | ||
148f9bb8 | 441 | static bool match_llc(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o) |
316ad248 PZ |
442 | { |
443 | int cpu1 = c->cpu_index, cpu2 = o->cpu_index; | |
444 | ||
445 | if (per_cpu(cpu_llc_id, cpu1) != BAD_APICID && | |
446 | per_cpu(cpu_llc_id, cpu1) == per_cpu(cpu_llc_id, cpu2)) | |
447 | return topology_sane(c, o, "llc"); | |
448 | ||
449 | return false; | |
d4fbe4f0 AH |
450 | } |
451 | ||
cebf15eb DH |
452 | /* |
453 | * Unlike the other levels, we do not enforce keeping a | |
454 | * multicore group inside a NUMA node. If this happens, we will | |
455 | * discard the MC level of the topology later. | |
456 | */ | |
457 | static bool match_die(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o) | |
316ad248 | 458 | { |
cebf15eb DH |
459 | if (c->phys_proc_id == o->phys_proc_id) |
460 | return true; | |
316ad248 PZ |
461 | return false; |
462 | } | |
1d89a7f0 | 463 | |
cebf15eb DH |
464 | static struct sched_domain_topology_level numa_inside_package_topology[] = { |
465 | #ifdef CONFIG_SCHED_SMT | |
466 | { cpu_smt_mask, cpu_smt_flags, SD_INIT_NAME(SMT) }, | |
467 | #endif | |
468 | #ifdef CONFIG_SCHED_MC | |
469 | { cpu_coregroup_mask, cpu_core_flags, SD_INIT_NAME(MC) }, | |
470 | #endif | |
471 | { NULL, }, | |
472 | }; | |
473 | /* | |
474 | * set_sched_topology() sets the topology internal to a CPU. The | |
475 | * NUMA topologies are layered on top of it to build the full | |
476 | * system topology. | |
477 | * | |
478 | * If NUMA nodes are observed to occur within a CPU package, this | |
479 | * function should be called. It forces the sched domain code to | |
480 | * only use the SMT level for the CPU portion of the topology. | |
481 | * This essentially falls back to relying on NUMA information | |
482 | * from the SRAT table to describe the entire system topology | |
483 | * (except for hyperthreads). | |
484 | */ | |
485 | static void primarily_use_numa_for_topology(void) | |
486 | { | |
487 | set_sched_topology(numa_inside_package_topology); | |
488 | } | |
489 | ||
148f9bb8 | 490 | void set_cpu_sibling_map(int cpu) |
768d9505 | 491 | { |
316ad248 | 492 | bool has_smt = smp_num_siblings > 1; |
b0bc225d | 493 | bool has_mp = has_smt || boot_cpu_data.x86_max_cores > 1; |
768d9505 | 494 | struct cpuinfo_x86 *c = &cpu_data(cpu); |
316ad248 PZ |
495 | struct cpuinfo_x86 *o; |
496 | int i; | |
768d9505 | 497 | |
c2d1cec1 | 498 | cpumask_set_cpu(cpu, cpu_sibling_setup_mask); |
768d9505 | 499 | |
b0bc225d | 500 | if (!has_mp) { |
7d79a7bd | 501 | cpumask_set_cpu(cpu, topology_sibling_cpumask(cpu)); |
316ad248 | 502 | cpumask_set_cpu(cpu, cpu_llc_shared_mask(cpu)); |
7d79a7bd | 503 | cpumask_set_cpu(cpu, topology_core_cpumask(cpu)); |
768d9505 GC |
504 | c->booted_cores = 1; |
505 | return; | |
506 | } | |
507 | ||
c2d1cec1 | 508 | for_each_cpu(i, cpu_sibling_setup_mask) { |
316ad248 PZ |
509 | o = &cpu_data(i); |
510 | ||
511 | if ((i == cpu) || (has_smt && match_smt(c, o))) | |
7d79a7bd | 512 | link_mask(topology_sibling_cpumask, cpu, i); |
316ad248 | 513 | |
b0bc225d | 514 | if ((i == cpu) || (has_mp && match_llc(c, o))) |
7d79a7bd | 515 | link_mask(cpu_llc_shared_mask, cpu, i); |
316ad248 | 516 | |
ceb1cbac KB |
517 | } |
518 | ||
519 | /* | |
520 | * This needs a separate iteration over the cpus because we rely on all | |
7d79a7bd | 521 | * topology_sibling_cpumask links to be set-up. |
ceb1cbac KB |
522 | */ |
523 | for_each_cpu(i, cpu_sibling_setup_mask) { | |
524 | o = &cpu_data(i); | |
525 | ||
cebf15eb | 526 | if ((i == cpu) || (has_mp && match_die(c, o))) { |
7d79a7bd | 527 | link_mask(topology_core_cpumask, cpu, i); |
316ad248 | 528 | |
768d9505 GC |
529 | /* |
530 | * Does this new cpu bringup a new core? | |
531 | */ | |
7d79a7bd BG |
532 | if (cpumask_weight( |
533 | topology_sibling_cpumask(cpu)) == 1) { | |
768d9505 GC |
534 | /* |
535 | * for each core in package, increment | |
536 | * the booted_cores for this new cpu | |
537 | */ | |
7d79a7bd BG |
538 | if (cpumask_first( |
539 | topology_sibling_cpumask(i)) == i) | |
768d9505 GC |
540 | c->booted_cores++; |
541 | /* | |
542 | * increment the core count for all | |
543 | * the other cpus in this package | |
544 | */ | |
545 | if (i != cpu) | |
546 | cpu_data(i).booted_cores++; | |
547 | } else if (i != cpu && !c->booted_cores) | |
548 | c->booted_cores = cpu_data(i).booted_cores; | |
549 | } | |
728e5653 | 550 | if (match_die(c, o) && !topology_same_node(c, o)) |
cebf15eb | 551 | primarily_use_numa_for_topology(); |
768d9505 GC |
552 | } |
553 | } | |
554 | ||
70708a18 | 555 | /* maps the cpu to the sched domain representing multi-core */ |
030bb203 | 556 | const struct cpumask *cpu_coregroup_mask(int cpu) |
70708a18 | 557 | { |
9f646389 | 558 | return cpu_llc_shared_mask(cpu); |
030bb203 RR |
559 | } |
560 | ||
a4928cff | 561 | static void impress_friends(void) |
904541e2 GOC |
562 | { |
563 | int cpu; | |
564 | unsigned long bogosum = 0; | |
565 | /* | |
566 | * Allow the user to impress friends. | |
567 | */ | |
c767a54b | 568 | pr_debug("Before bogomips\n"); |
904541e2 | 569 | for_each_possible_cpu(cpu) |
c2d1cec1 | 570 | if (cpumask_test_cpu(cpu, cpu_callout_mask)) |
904541e2 | 571 | bogosum += cpu_data(cpu).loops_per_jiffy; |
c767a54b | 572 | pr_info("Total of %d processors activated (%lu.%02lu BogoMIPS)\n", |
f68e00a3 | 573 | num_online_cpus(), |
904541e2 GOC |
574 | bogosum/(500000/HZ), |
575 | (bogosum/(5000/HZ))%100); | |
576 | ||
c767a54b | 577 | pr_debug("Before bogocount - setting activated=1\n"); |
904541e2 GOC |
578 | } |
579 | ||
569712b2 | 580 | void __inquire_remote_apic(int apicid) |
cb3c8b90 GOC |
581 | { |
582 | unsigned i, regs[] = { APIC_ID >> 4, APIC_LVR >> 4, APIC_SPIV >> 4 }; | |
a6c23905 | 583 | const char * const names[] = { "ID", "VERSION", "SPIV" }; |
cb3c8b90 GOC |
584 | int timeout; |
585 | u32 status; | |
586 | ||
c767a54b | 587 | pr_info("Inquiring remote APIC 0x%x...\n", apicid); |
cb3c8b90 GOC |
588 | |
589 | for (i = 0; i < ARRAY_SIZE(regs); i++) { | |
c767a54b | 590 | pr_info("... APIC 0x%x %s: ", apicid, names[i]); |
cb3c8b90 GOC |
591 | |
592 | /* | |
593 | * Wait for idle. | |
594 | */ | |
595 | status = safe_apic_wait_icr_idle(); | |
596 | if (status) | |
c767a54b | 597 | pr_cont("a previous APIC delivery may have failed\n"); |
cb3c8b90 | 598 | |
1b374e4d | 599 | apic_icr_write(APIC_DM_REMRD | regs[i], apicid); |
cb3c8b90 GOC |
600 | |
601 | timeout = 0; | |
602 | do { | |
603 | udelay(100); | |
604 | status = apic_read(APIC_ICR) & APIC_ICR_RR_MASK; | |
605 | } while (status == APIC_ICR_RR_INPROG && timeout++ < 1000); | |
606 | ||
607 | switch (status) { | |
608 | case APIC_ICR_RR_VALID: | |
609 | status = apic_read(APIC_RRR); | |
c767a54b | 610 | pr_cont("%08x\n", status); |
cb3c8b90 GOC |
611 | break; |
612 | default: | |
c767a54b | 613 | pr_cont("failed\n"); |
cb3c8b90 GOC |
614 | } |
615 | } | |
616 | } | |
617 | ||
d68921f9 LB |
618 | /* |
619 | * The Multiprocessor Specification 1.4 (1997) example code suggests | |
620 | * that there should be a 10ms delay between the BSP asserting INIT | |
621 | * and de-asserting INIT, when starting a remote processor. | |
622 | * But that slows boot and resume on modern processors, which include | |
623 | * many cores and don't require that delay. | |
624 | * | |
625 | * Cmdline "init_cpu_udelay=" is available to over-ride this delay. | |
1a744cb3 | 626 | * Modern processor families are quirked to remove the delay entirely. |
d68921f9 LB |
627 | */ |
628 | #define UDELAY_10MS_DEFAULT 10000 | |
629 | ||
656279a1 | 630 | static unsigned int init_udelay = UINT_MAX; |
d68921f9 LB |
631 | |
632 | static int __init cpu_init_udelay(char *str) | |
633 | { | |
634 | get_option(&str, &init_udelay); | |
635 | ||
636 | return 0; | |
637 | } | |
638 | early_param("cpu_init_udelay", cpu_init_udelay); | |
639 | ||
1a744cb3 LB |
640 | static void __init smp_quirk_init_udelay(void) |
641 | { | |
642 | /* if cmdline changed it from default, leave it alone */ | |
656279a1 | 643 | if (init_udelay != UINT_MAX) |
1a744cb3 LB |
644 | return; |
645 | ||
646 | /* if modern processor, use no delay */ | |
647 | if (((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) && (boot_cpu_data.x86 == 6)) || | |
656279a1 | 648 | ((boot_cpu_data.x86_vendor == X86_VENDOR_AMD) && (boot_cpu_data.x86 >= 0xF))) { |
1a744cb3 | 649 | init_udelay = 0; |
656279a1 LB |
650 | return; |
651 | } | |
f1ccd249 LB |
652 | /* else, use legacy delay */ |
653 | init_udelay = UDELAY_10MS_DEFAULT; | |
1a744cb3 LB |
654 | } |
655 | ||
cb3c8b90 GOC |
656 | /* |
657 | * Poke the other CPU in the eye via NMI to wake it up. Remember that the normal | |
658 | * INIT, INIT, STARTUP sequence will reset the chip hard for us, and this | |
659 | * won't ... remember to clear down the APIC, etc later. | |
660 | */ | |
148f9bb8 | 661 | int |
e1c467e6 | 662 | wakeup_secondary_cpu_via_nmi(int apicid, unsigned long start_eip) |
cb3c8b90 GOC |
663 | { |
664 | unsigned long send_status, accept_status = 0; | |
665 | int maxlvt; | |
666 | ||
667 | /* Target chip */ | |
cb3c8b90 GOC |
668 | /* Boot on the stack */ |
669 | /* Kick the second */ | |
e1c467e6 | 670 | apic_icr_write(APIC_DM_NMI | apic->dest_logical, apicid); |
cb3c8b90 | 671 | |
cfc1b9a6 | 672 | pr_debug("Waiting for send to finish...\n"); |
cb3c8b90 GOC |
673 | send_status = safe_apic_wait_icr_idle(); |
674 | ||
675 | /* | |
676 | * Give the other CPU some time to accept the IPI. | |
677 | */ | |
678 | udelay(200); | |
569712b2 | 679 | if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) { |
59ef48a5 CG |
680 | maxlvt = lapic_get_maxlvt(); |
681 | if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */ | |
682 | apic_write(APIC_ESR, 0); | |
683 | accept_status = (apic_read(APIC_ESR) & 0xEF); | |
684 | } | |
c767a54b | 685 | pr_debug("NMI sent\n"); |
cb3c8b90 GOC |
686 | |
687 | if (send_status) | |
c767a54b | 688 | pr_err("APIC never delivered???\n"); |
cb3c8b90 | 689 | if (accept_status) |
c767a54b | 690 | pr_err("APIC delivery error (%lx)\n", accept_status); |
cb3c8b90 GOC |
691 | |
692 | return (send_status | accept_status); | |
693 | } | |
cb3c8b90 | 694 | |
148f9bb8 | 695 | static int |
569712b2 | 696 | wakeup_secondary_cpu_via_init(int phys_apicid, unsigned long start_eip) |
cb3c8b90 | 697 | { |
f5d6a52f | 698 | unsigned long send_status = 0, accept_status = 0; |
cb3c8b90 GOC |
699 | int maxlvt, num_starts, j; |
700 | ||
593f4a78 MR |
701 | maxlvt = lapic_get_maxlvt(); |
702 | ||
cb3c8b90 GOC |
703 | /* |
704 | * Be paranoid about clearing APIC errors. | |
705 | */ | |
706 | if (APIC_INTEGRATED(apic_version[phys_apicid])) { | |
593f4a78 MR |
707 | if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */ |
708 | apic_write(APIC_ESR, 0); | |
cb3c8b90 GOC |
709 | apic_read(APIC_ESR); |
710 | } | |
711 | ||
c767a54b | 712 | pr_debug("Asserting INIT\n"); |
cb3c8b90 GOC |
713 | |
714 | /* | |
715 | * Turn INIT on target chip | |
716 | */ | |
cb3c8b90 GOC |
717 | /* |
718 | * Send IPI | |
719 | */ | |
1b374e4d SS |
720 | apic_icr_write(APIC_INT_LEVELTRIG | APIC_INT_ASSERT | APIC_DM_INIT, |
721 | phys_apicid); | |
cb3c8b90 | 722 | |
cfc1b9a6 | 723 | pr_debug("Waiting for send to finish...\n"); |
cb3c8b90 GOC |
724 | send_status = safe_apic_wait_icr_idle(); |
725 | ||
7cb68598 | 726 | udelay(init_udelay); |
cb3c8b90 | 727 | |
c767a54b | 728 | pr_debug("Deasserting INIT\n"); |
cb3c8b90 GOC |
729 | |
730 | /* Target chip */ | |
cb3c8b90 | 731 | /* Send IPI */ |
1b374e4d | 732 | apic_icr_write(APIC_INT_LEVELTRIG | APIC_DM_INIT, phys_apicid); |
cb3c8b90 | 733 | |
cfc1b9a6 | 734 | pr_debug("Waiting for send to finish...\n"); |
cb3c8b90 GOC |
735 | send_status = safe_apic_wait_icr_idle(); |
736 | ||
737 | mb(); | |
cb3c8b90 GOC |
738 | |
739 | /* | |
740 | * Should we send STARTUP IPIs ? | |
741 | * | |
742 | * Determine this based on the APIC version. | |
743 | * If we don't have an integrated APIC, don't send the STARTUP IPIs. | |
744 | */ | |
745 | if (APIC_INTEGRATED(apic_version[phys_apicid])) | |
746 | num_starts = 2; | |
747 | else | |
748 | num_starts = 0; | |
749 | ||
cb3c8b90 GOC |
750 | /* |
751 | * Run STARTUP IPI loop. | |
752 | */ | |
c767a54b | 753 | pr_debug("#startup loops: %d\n", num_starts); |
cb3c8b90 | 754 | |
cb3c8b90 | 755 | for (j = 1; j <= num_starts; j++) { |
c767a54b | 756 | pr_debug("Sending STARTUP #%d\n", j); |
593f4a78 MR |
757 | if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */ |
758 | apic_write(APIC_ESR, 0); | |
cb3c8b90 | 759 | apic_read(APIC_ESR); |
c767a54b | 760 | pr_debug("After apic_write\n"); |
cb3c8b90 GOC |
761 | |
762 | /* | |
763 | * STARTUP IPI | |
764 | */ | |
765 | ||
766 | /* Target chip */ | |
cb3c8b90 GOC |
767 | /* Boot on the stack */ |
768 | /* Kick the second */ | |
1b374e4d SS |
769 | apic_icr_write(APIC_DM_STARTUP | (start_eip >> 12), |
770 | phys_apicid); | |
cb3c8b90 GOC |
771 | |
772 | /* | |
773 | * Give the other CPU some time to accept the IPI. | |
774 | */ | |
fcafddec LB |
775 | if (init_udelay == 0) |
776 | udelay(10); | |
777 | else | |
a9bcaa02 | 778 | udelay(300); |
cb3c8b90 | 779 | |
c767a54b | 780 | pr_debug("Startup point 1\n"); |
cb3c8b90 | 781 | |
cfc1b9a6 | 782 | pr_debug("Waiting for send to finish...\n"); |
cb3c8b90 GOC |
783 | send_status = safe_apic_wait_icr_idle(); |
784 | ||
785 | /* | |
786 | * Give the other CPU some time to accept the IPI. | |
787 | */ | |
fcafddec LB |
788 | if (init_udelay == 0) |
789 | udelay(10); | |
790 | else | |
a9bcaa02 | 791 | udelay(200); |
cb3c8b90 | 792 | |
593f4a78 | 793 | if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */ |
cb3c8b90 | 794 | apic_write(APIC_ESR, 0); |
cb3c8b90 GOC |
795 | accept_status = (apic_read(APIC_ESR) & 0xEF); |
796 | if (send_status || accept_status) | |
797 | break; | |
798 | } | |
c767a54b | 799 | pr_debug("After Startup\n"); |
cb3c8b90 GOC |
800 | |
801 | if (send_status) | |
c767a54b | 802 | pr_err("APIC never delivered???\n"); |
cb3c8b90 | 803 | if (accept_status) |
c767a54b | 804 | pr_err("APIC delivery error (%lx)\n", accept_status); |
cb3c8b90 GOC |
805 | |
806 | return (send_status | accept_status); | |
807 | } | |
cb3c8b90 | 808 | |
a17bce4d BP |
809 | void smp_announce(void) |
810 | { | |
811 | int num_nodes = num_online_nodes(); | |
812 | ||
813 | printk(KERN_INFO "x86: Booted up %d node%s, %d CPUs\n", | |
814 | num_nodes, (num_nodes > 1 ? "s" : ""), num_online_cpus()); | |
815 | } | |
816 | ||
2eaad1fd | 817 | /* reduce the number of lines printed when booting a large cpu count system */ |
148f9bb8 | 818 | static void announce_cpu(int cpu, int apicid) |
2eaad1fd MT |
819 | { |
820 | static int current_node = -1; | |
4adc8b71 | 821 | int node = early_cpu_to_node(cpu); |
a17bce4d | 822 | static int width, node_width; |
646e29a1 BP |
823 | |
824 | if (!width) | |
825 | width = num_digits(num_possible_cpus()) + 1; /* + '#' sign */ | |
2eaad1fd | 826 | |
a17bce4d BP |
827 | if (!node_width) |
828 | node_width = num_digits(num_possible_nodes()) + 1; /* + '#' */ | |
829 | ||
830 | if (cpu == 1) | |
831 | printk(KERN_INFO "x86: Booting SMP configuration:\n"); | |
832 | ||
2eaad1fd MT |
833 | if (system_state == SYSTEM_BOOTING) { |
834 | if (node != current_node) { | |
835 | if (current_node > (-1)) | |
a17bce4d | 836 | pr_cont("\n"); |
2eaad1fd | 837 | current_node = node; |
a17bce4d BP |
838 | |
839 | printk(KERN_INFO ".... node %*s#%d, CPUs: ", | |
840 | node_width - num_digits(node), " ", node); | |
2eaad1fd | 841 | } |
646e29a1 BP |
842 | |
843 | /* Add padding for the BSP */ | |
844 | if (cpu == 1) | |
845 | pr_cont("%*s", width + 1, " "); | |
846 | ||
847 | pr_cont("%*s#%d", width - num_digits(cpu), " ", cpu); | |
848 | ||
2eaad1fd MT |
849 | } else |
850 | pr_info("Booting Node %d Processor %d APIC 0x%x\n", | |
851 | node, cpu, apicid); | |
852 | } | |
853 | ||
e1c467e6 FY |
854 | static int wakeup_cpu0_nmi(unsigned int cmd, struct pt_regs *regs) |
855 | { | |
856 | int cpu; | |
857 | ||
858 | cpu = smp_processor_id(); | |
859 | if (cpu == 0 && !cpu_online(cpu) && enable_start_cpu0) | |
860 | return NMI_HANDLED; | |
861 | ||
862 | return NMI_DONE; | |
863 | } | |
864 | ||
865 | /* | |
866 | * Wake up AP by INIT, INIT, STARTUP sequence. | |
867 | * | |
868 | * Instead of waiting for STARTUP after INITs, BSP will execute the BIOS | |
869 | * boot-strap code which is not a desired behavior for waking up BSP. To | |
870 | * void the boot-strap code, wake up CPU0 by NMI instead. | |
871 | * | |
872 | * This works to wake up soft offlined CPU0 only. If CPU0 is hard offlined | |
873 | * (i.e. physically hot removed and then hot added), NMI won't wake it up. | |
874 | * We'll change this code in the future to wake up hard offlined CPU0 if | |
875 | * real platform and request are available. | |
876 | */ | |
148f9bb8 | 877 | static int |
e1c467e6 FY |
878 | wakeup_cpu_via_init_nmi(int cpu, unsigned long start_ip, int apicid, |
879 | int *cpu0_nmi_registered) | |
880 | { | |
881 | int id; | |
882 | int boot_error; | |
883 | ||
ea7bdc65 JK |
884 | preempt_disable(); |
885 | ||
e1c467e6 FY |
886 | /* |
887 | * Wake up AP by INIT, INIT, STARTUP sequence. | |
888 | */ | |
ea7bdc65 JK |
889 | if (cpu) { |
890 | boot_error = wakeup_secondary_cpu_via_init(apicid, start_ip); | |
891 | goto out; | |
892 | } | |
e1c467e6 FY |
893 | |
894 | /* | |
895 | * Wake up BSP by nmi. | |
896 | * | |
897 | * Register a NMI handler to help wake up CPU0. | |
898 | */ | |
899 | boot_error = register_nmi_handler(NMI_LOCAL, | |
900 | wakeup_cpu0_nmi, 0, "wake_cpu0"); | |
901 | ||
902 | if (!boot_error) { | |
903 | enable_start_cpu0 = 1; | |
904 | *cpu0_nmi_registered = 1; | |
905 | if (apic->dest_logical == APIC_DEST_LOGICAL) | |
906 | id = cpu0_logical_apicid; | |
907 | else | |
908 | id = apicid; | |
909 | boot_error = wakeup_secondary_cpu_via_nmi(id, start_ip); | |
910 | } | |
ea7bdc65 JK |
911 | |
912 | out: | |
913 | preempt_enable(); | |
e1c467e6 FY |
914 | |
915 | return boot_error; | |
916 | } | |
917 | ||
3f85483b BO |
918 | void common_cpu_up(unsigned int cpu, struct task_struct *idle) |
919 | { | |
920 | /* Just in case we booted with a single CPU. */ | |
921 | alternatives_enable_smp(); | |
922 | ||
923 | per_cpu(current_task, cpu) = idle; | |
924 | ||
925 | #ifdef CONFIG_X86_32 | |
926 | /* Stack for startup_32 can be just as for start_secondary onwards */ | |
927 | irq_ctx_init(cpu); | |
928 | per_cpu(cpu_current_top_of_stack, cpu) = | |
929 | (unsigned long)task_stack_page(idle) + THREAD_SIZE; | |
930 | #else | |
931 | clear_tsk_thread_flag(idle, TIF_FORK); | |
932 | initial_gs = per_cpu_offset(cpu); | |
933 | #endif | |
3f85483b BO |
934 | } |
935 | ||
cb3c8b90 GOC |
936 | /* |
937 | * NOTE - on most systems this is a PHYSICAL apic ID, but on multiquad | |
938 | * (ie clustered apic addressing mode), this is a LOGICAL apic ID. | |
1f5bcabf IM |
939 | * Returns zero if CPU booted OK, else error code from |
940 | * ->wakeup_secondary_cpu. | |
cb3c8b90 | 941 | */ |
148f9bb8 | 942 | static int do_boot_cpu(int apicid, int cpu, struct task_struct *idle) |
cb3c8b90 | 943 | { |
48927bbb | 944 | volatile u32 *trampoline_status = |
b429dbf6 | 945 | (volatile u32 *) __va(real_mode_header->trampoline_status); |
48927bbb | 946 | /* start_ip had better be page-aligned! */ |
f37240f1 | 947 | unsigned long start_ip = real_mode_header->trampoline_start; |
48927bbb | 948 | |
cb3c8b90 | 949 | unsigned long boot_error = 0; |
e1c467e6 | 950 | int cpu0_nmi_registered = 0; |
ce4b1b16 | 951 | unsigned long timeout; |
cb3c8b90 | 952 | |
7eb43a6d TG |
953 | idle->thread.sp = (unsigned long) (((struct pt_regs *) |
954 | (THREAD_SIZE + task_stack_page(idle))) - 1); | |
cb3c8b90 | 955 | |
a939098a | 956 | early_gdt_descr.address = (unsigned long)get_cpu_gdt_table(cpu); |
3e970473 | 957 | initial_code = (unsigned long)start_secondary; |
7eb43a6d | 958 | stack_start = idle->thread.sp; |
cb3c8b90 | 959 | |
20d5e4a9 ZG |
960 | /* |
961 | * Enable the espfix hack for this CPU | |
962 | */ | |
963 | #ifdef CONFIG_X86_ESPFIX64 | |
964 | init_espfix_ap(cpu); | |
965 | #endif | |
966 | ||
2eaad1fd MT |
967 | /* So we see what's up */ |
968 | announce_cpu(cpu, apicid); | |
cb3c8b90 GOC |
969 | |
970 | /* | |
971 | * This grunge runs the startup process for | |
972 | * the targeted processor. | |
973 | */ | |
974 | ||
34d05591 | 975 | if (get_uv_system_type() != UV_NON_UNIQUE_APIC) { |
cb3c8b90 | 976 | |
cfc1b9a6 | 977 | pr_debug("Setting warm reset code and vector.\n"); |
cb3c8b90 | 978 | |
34d05591 JS |
979 | smpboot_setup_warm_reset_vector(start_ip); |
980 | /* | |
981 | * Be paranoid about clearing APIC errors. | |
db96b0a0 CG |
982 | */ |
983 | if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) { | |
984 | apic_write(APIC_ESR, 0); | |
985 | apic_read(APIC_ESR); | |
986 | } | |
34d05591 | 987 | } |
cb3c8b90 | 988 | |
ce4b1b16 IM |
989 | /* |
990 | * AP might wait on cpu_callout_mask in cpu_init() with | |
991 | * cpu_initialized_mask set if previous attempt to online | |
992 | * it timed-out. Clear cpu_initialized_mask so that after | |
993 | * INIT/SIPI it could start with a clean state. | |
994 | */ | |
995 | cpumask_clear_cpu(cpu, cpu_initialized_mask); | |
996 | smp_mb(); | |
997 | ||
cb3c8b90 | 998 | /* |
e1c467e6 FY |
999 | * Wake up a CPU in difference cases: |
1000 | * - Use the method in the APIC driver if it's defined | |
1001 | * Otherwise, | |
1002 | * - Use an INIT boot APIC message for APs or NMI for BSP. | |
cb3c8b90 | 1003 | */ |
1f5bcabf IM |
1004 | if (apic->wakeup_secondary_cpu) |
1005 | boot_error = apic->wakeup_secondary_cpu(apicid, start_ip); | |
1006 | else | |
e1c467e6 FY |
1007 | boot_error = wakeup_cpu_via_init_nmi(cpu, start_ip, apicid, |
1008 | &cpu0_nmi_registered); | |
cb3c8b90 GOC |
1009 | |
1010 | if (!boot_error) { | |
1011 | /* | |
6e38f1e7 | 1012 | * Wait 10s total for first sign of life from AP |
cb3c8b90 | 1013 | */ |
ce4b1b16 IM |
1014 | boot_error = -1; |
1015 | timeout = jiffies + 10*HZ; | |
1016 | while (time_before(jiffies, timeout)) { | |
1017 | if (cpumask_test_cpu(cpu, cpu_initialized_mask)) { | |
1018 | /* | |
1019 | * Tell AP to proceed with initialization | |
1020 | */ | |
1021 | cpumask_set_cpu(cpu, cpu_callout_mask); | |
1022 | boot_error = 0; | |
1023 | break; | |
1024 | } | |
ce4b1b16 IM |
1025 | schedule(); |
1026 | } | |
1027 | } | |
cb3c8b90 | 1028 | |
ce4b1b16 | 1029 | if (!boot_error) { |
cb3c8b90 | 1030 | /* |
ce4b1b16 | 1031 | * Wait till AP completes initial initialization |
cb3c8b90 | 1032 | */ |
ce4b1b16 | 1033 | while (!cpumask_test_cpu(cpu, cpu_callin_mask)) { |
68f202e4 SS |
1034 | /* |
1035 | * Allow other tasks to run while we wait for the | |
1036 | * AP to come online. This also gives a chance | |
1037 | * for the MTRR work(triggered by the AP coming online) | |
1038 | * to be completed in the stop machine context. | |
1039 | */ | |
1040 | schedule(); | |
cb3c8b90 | 1041 | } |
cb3c8b90 GOC |
1042 | } |
1043 | ||
1044 | /* mark "stuck" area as not stuck */ | |
48927bbb | 1045 | *trampoline_status = 0; |
cb3c8b90 | 1046 | |
02421f98 YL |
1047 | if (get_uv_system_type() != UV_NON_UNIQUE_APIC) { |
1048 | /* | |
1049 | * Cleanup possible dangling ends... | |
1050 | */ | |
1051 | smpboot_restore_warm_reset_vector(); | |
1052 | } | |
e1c467e6 FY |
1053 | /* |
1054 | * Clean up the nmi handler. Do this after the callin and callout sync | |
1055 | * to avoid impact of possible long unregister time. | |
1056 | */ | |
1057 | if (cpu0_nmi_registered) | |
1058 | unregister_nmi_handler(NMI_LOCAL, "wake_cpu0"); | |
1059 | ||
cb3c8b90 GOC |
1060 | return boot_error; |
1061 | } | |
1062 | ||
148f9bb8 | 1063 | int native_cpu_up(unsigned int cpu, struct task_struct *tidle) |
cb3c8b90 | 1064 | { |
a21769a4 | 1065 | int apicid = apic->cpu_present_to_apicid(cpu); |
cb3c8b90 GOC |
1066 | unsigned long flags; |
1067 | int err; | |
1068 | ||
1069 | WARN_ON(irqs_disabled()); | |
1070 | ||
cfc1b9a6 | 1071 | pr_debug("++++++++++++++++++++=_---CPU UP %u\n", cpu); |
cb3c8b90 | 1072 | |
30106c17 | 1073 | if (apicid == BAD_APICID || |
c284b42a | 1074 | !physid_isset(apicid, phys_cpu_present_map) || |
fa63030e | 1075 | !apic->apic_id_valid(apicid)) { |
c767a54b | 1076 | pr_err("%s: bad cpu %d\n", __func__, cpu); |
cb3c8b90 GOC |
1077 | return -EINVAL; |
1078 | } | |
1079 | ||
1080 | /* | |
1081 | * Already booted CPU? | |
1082 | */ | |
c2d1cec1 | 1083 | if (cpumask_test_cpu(cpu, cpu_callin_mask)) { |
cfc1b9a6 | 1084 | pr_debug("do_boot_cpu %d Already started\n", cpu); |
cb3c8b90 GOC |
1085 | return -ENOSYS; |
1086 | } | |
1087 | ||
1088 | /* | |
1089 | * Save current MTRR state in case it was changed since early boot | |
1090 | * (e.g. by the ACPI SMI) to initialize new CPUs with MTRRs in sync: | |
1091 | */ | |
1092 | mtrr_save_state(); | |
1093 | ||
2a442c9c PM |
1094 | /* x86 CPUs take themselves offline, so delayed offline is OK. */ |
1095 | err = cpu_check_up_prepare(cpu); | |
1096 | if (err && err != -EBUSY) | |
1097 | return err; | |
cb3c8b90 | 1098 | |
644c1541 VP |
1099 | /* the FPU context is blank, nobody can own it */ |
1100 | __cpu_disable_lazy_restore(cpu); | |
1101 | ||
3f85483b BO |
1102 | common_cpu_up(cpu, tidle); |
1103 | ||
ce0d3c0a TG |
1104 | /* |
1105 | * We have to walk the irq descriptors to setup the vector | |
1106 | * space for the cpu which comes online. Prevent irq | |
1107 | * alloc/free across the bringup. | |
1108 | */ | |
1109 | irq_lock_sparse(); | |
1110 | ||
7eb43a6d | 1111 | err = do_boot_cpu(apicid, cpu, tidle); |
ce0d3c0a | 1112 | |
61165d7a | 1113 | if (err) { |
ce0d3c0a | 1114 | irq_unlock_sparse(); |
feef1e8e | 1115 | pr_err("do_boot_cpu failed(%d) to wakeup CPU#%u\n", err, cpu); |
61165d7a | 1116 | return -EIO; |
cb3c8b90 GOC |
1117 | } |
1118 | ||
1119 | /* | |
1120 | * Check TSC synchronization with the AP (keep irqs disabled | |
1121 | * while doing so): | |
1122 | */ | |
1123 | local_irq_save(flags); | |
1124 | check_tsc_sync_source(cpu); | |
1125 | local_irq_restore(flags); | |
1126 | ||
7c04e64a | 1127 | while (!cpu_online(cpu)) { |
cb3c8b90 GOC |
1128 | cpu_relax(); |
1129 | touch_nmi_watchdog(); | |
1130 | } | |
1131 | ||
ce0d3c0a TG |
1132 | irq_unlock_sparse(); |
1133 | ||
cb3c8b90 GOC |
1134 | return 0; |
1135 | } | |
1136 | ||
7167d08e HK |
1137 | /** |
1138 | * arch_disable_smp_support() - disables SMP support for x86 at runtime | |
1139 | */ | |
1140 | void arch_disable_smp_support(void) | |
1141 | { | |
1142 | disable_ioapic_support(); | |
1143 | } | |
1144 | ||
8aef135c GOC |
1145 | /* |
1146 | * Fall back to non SMP mode after errors. | |
1147 | * | |
1148 | * RED-PEN audit/test this more. I bet there is more state messed up here. | |
1149 | */ | |
1150 | static __init void disable_smp(void) | |
1151 | { | |
613c25ef TG |
1152 | pr_info("SMP disabled\n"); |
1153 | ||
ef4c59a4 TG |
1154 | disable_ioapic_support(); |
1155 | ||
4f062896 RR |
1156 | init_cpu_present(cpumask_of(0)); |
1157 | init_cpu_possible(cpumask_of(0)); | |
0f385d1d | 1158 | |
8aef135c | 1159 | if (smp_found_config) |
b6df1b8b | 1160 | physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map); |
8aef135c | 1161 | else |
b6df1b8b | 1162 | physid_set_mask_of_physid(0, &phys_cpu_present_map); |
7d79a7bd BG |
1163 | cpumask_set_cpu(0, topology_sibling_cpumask(0)); |
1164 | cpumask_set_cpu(0, topology_core_cpumask(0)); | |
8aef135c GOC |
1165 | } |
1166 | ||
613c25ef TG |
1167 | enum { |
1168 | SMP_OK, | |
1169 | SMP_NO_CONFIG, | |
1170 | SMP_NO_APIC, | |
1171 | SMP_FORCE_UP, | |
1172 | }; | |
1173 | ||
8aef135c GOC |
1174 | /* |
1175 | * Various sanity checks. | |
1176 | */ | |
1177 | static int __init smp_sanity_check(unsigned max_cpus) | |
1178 | { | |
ac23d4ee | 1179 | preempt_disable(); |
a58f03b0 | 1180 | |
1ff2f20d | 1181 | #if !defined(CONFIG_X86_BIGSMP) && defined(CONFIG_X86_32) |
a58f03b0 YL |
1182 | if (def_to_bigsmp && nr_cpu_ids > 8) { |
1183 | unsigned int cpu; | |
1184 | unsigned nr; | |
1185 | ||
c767a54b JP |
1186 | pr_warn("More than 8 CPUs detected - skipping them\n" |
1187 | "Use CONFIG_X86_BIGSMP\n"); | |
a58f03b0 YL |
1188 | |
1189 | nr = 0; | |
1190 | for_each_present_cpu(cpu) { | |
1191 | if (nr >= 8) | |
c2d1cec1 | 1192 | set_cpu_present(cpu, false); |
a58f03b0 YL |
1193 | nr++; |
1194 | } | |
1195 | ||
1196 | nr = 0; | |
1197 | for_each_possible_cpu(cpu) { | |
1198 | if (nr >= 8) | |
c2d1cec1 | 1199 | set_cpu_possible(cpu, false); |
a58f03b0 YL |
1200 | nr++; |
1201 | } | |
1202 | ||
1203 | nr_cpu_ids = 8; | |
1204 | } | |
1205 | #endif | |
1206 | ||
8aef135c | 1207 | if (!physid_isset(hard_smp_processor_id(), phys_cpu_present_map)) { |
c767a54b | 1208 | pr_warn("weird, boot CPU (#%d) not listed by the BIOS\n", |
55c395b4 MT |
1209 | hard_smp_processor_id()); |
1210 | ||
8aef135c GOC |
1211 | physid_set(hard_smp_processor_id(), phys_cpu_present_map); |
1212 | } | |
1213 | ||
1214 | /* | |
1215 | * If we couldn't find an SMP configuration at boot time, | |
1216 | * get out of here now! | |
1217 | */ | |
1218 | if (!smp_found_config && !acpi_lapic) { | |
ac23d4ee | 1219 | preempt_enable(); |
c767a54b | 1220 | pr_notice("SMP motherboard not detected\n"); |
613c25ef | 1221 | return SMP_NO_CONFIG; |
8aef135c GOC |
1222 | } |
1223 | ||
1224 | /* | |
1225 | * Should not be necessary because the MP table should list the boot | |
1226 | * CPU too, but we do it for the sake of robustness anyway. | |
1227 | */ | |
a27a6210 | 1228 | if (!apic->check_phys_apicid_present(boot_cpu_physical_apicid)) { |
c767a54b JP |
1229 | pr_notice("weird, boot CPU (#%d) not listed by the BIOS\n", |
1230 | boot_cpu_physical_apicid); | |
8aef135c GOC |
1231 | physid_set(hard_smp_processor_id(), phys_cpu_present_map); |
1232 | } | |
ac23d4ee | 1233 | preempt_enable(); |
8aef135c GOC |
1234 | |
1235 | /* | |
1236 | * If we couldn't find a local APIC, then get out of here now! | |
1237 | */ | |
1238 | if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid]) && | |
93984fbd | 1239 | !boot_cpu_has(X86_FEATURE_APIC)) { |
103428e5 CG |
1240 | if (!disable_apic) { |
1241 | pr_err("BIOS bug, local APIC #%d not detected!...\n", | |
1242 | boot_cpu_physical_apicid); | |
c767a54b | 1243 | pr_err("... forcing use of dummy APIC emulation (tell your hw vendor)\n"); |
103428e5 | 1244 | } |
613c25ef | 1245 | return SMP_NO_APIC; |
8aef135c GOC |
1246 | } |
1247 | ||
8aef135c GOC |
1248 | /* |
1249 | * If SMP should be disabled, then really disable it! | |
1250 | */ | |
1251 | if (!max_cpus) { | |
c767a54b | 1252 | pr_info("SMP mode deactivated\n"); |
613c25ef | 1253 | return SMP_FORCE_UP; |
8aef135c GOC |
1254 | } |
1255 | ||
613c25ef | 1256 | return SMP_OK; |
8aef135c GOC |
1257 | } |
1258 | ||
1259 | static void __init smp_cpu_index_default(void) | |
1260 | { | |
1261 | int i; | |
1262 | struct cpuinfo_x86 *c; | |
1263 | ||
7c04e64a | 1264 | for_each_possible_cpu(i) { |
8aef135c GOC |
1265 | c = &cpu_data(i); |
1266 | /* mark all to hotplug */ | |
9628937d | 1267 | c->cpu_index = nr_cpu_ids; |
8aef135c GOC |
1268 | } |
1269 | } | |
1270 | ||
1271 | /* | |
1272 | * Prepare for SMP bootup. The MP table or ACPI has been read | |
1273 | * earlier. Just do some sanity checking here and enable APIC mode. | |
1274 | */ | |
1275 | void __init native_smp_prepare_cpus(unsigned int max_cpus) | |
1276 | { | |
7ad728f9 RR |
1277 | unsigned int i; |
1278 | ||
8aef135c | 1279 | smp_cpu_index_default(); |
792363d2 | 1280 | |
8aef135c GOC |
1281 | /* |
1282 | * Setup boot CPU information | |
1283 | */ | |
30106c17 | 1284 | smp_store_boot_cpu_info(); /* Final full version of the data */ |
792363d2 YL |
1285 | cpumask_copy(cpu_callin_mask, cpumask_of(0)); |
1286 | mb(); | |
bd22a2f1 | 1287 | |
8aef135c | 1288 | current_thread_info()->cpu = 0; /* needed? */ |
7ad728f9 | 1289 | for_each_possible_cpu(i) { |
79f55997 LZ |
1290 | zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL); |
1291 | zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL); | |
b3d7336d | 1292 | zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL); |
7ad728f9 | 1293 | } |
8aef135c GOC |
1294 | set_cpu_sibling_map(0); |
1295 | ||
613c25ef TG |
1296 | switch (smp_sanity_check(max_cpus)) { |
1297 | case SMP_NO_CONFIG: | |
8aef135c | 1298 | disable_smp(); |
613c25ef TG |
1299 | if (APIC_init_uniprocessor()) |
1300 | pr_notice("Local APIC not detected. Using dummy APIC emulation.\n"); | |
1301 | return; | |
1302 | case SMP_NO_APIC: | |
1303 | disable_smp(); | |
1304 | return; | |
1305 | case SMP_FORCE_UP: | |
1306 | disable_smp(); | |
374aab33 | 1307 | apic_bsp_setup(false); |
250a1ac6 | 1308 | return; |
613c25ef TG |
1309 | case SMP_OK: |
1310 | break; | |
8aef135c GOC |
1311 | } |
1312 | ||
fa47f7e5 SS |
1313 | default_setup_apic_routing(); |
1314 | ||
4c9961d5 | 1315 | if (read_apic_id() != boot_cpu_physical_apicid) { |
8aef135c | 1316 | panic("Boot APIC ID in local APIC unexpected (%d vs %d)", |
4c9961d5 | 1317 | read_apic_id(), boot_cpu_physical_apicid); |
8aef135c GOC |
1318 | /* Or can we switch back to PIC here? */ |
1319 | } | |
1320 | ||
374aab33 | 1321 | cpu0_logical_apicid = apic_bsp_setup(false); |
ef4c59a4 | 1322 | |
c767a54b | 1323 | pr_info("CPU%d: ", 0); |
8aef135c | 1324 | print_cpu_info(&cpu_data(0)); |
c4bd1fda MS |
1325 | |
1326 | if (is_uv_system()) | |
1327 | uv_system_init(); | |
d0af9eed SS |
1328 | |
1329 | set_mtrr_aps_delayed_init(); | |
1a744cb3 LB |
1330 | |
1331 | smp_quirk_init_udelay(); | |
8aef135c | 1332 | } |
d0af9eed SS |
1333 | |
1334 | void arch_enable_nonboot_cpus_begin(void) | |
1335 | { | |
1336 | set_mtrr_aps_delayed_init(); | |
1337 | } | |
1338 | ||
1339 | void arch_enable_nonboot_cpus_end(void) | |
1340 | { | |
1341 | mtrr_aps_init(); | |
1342 | } | |
1343 | ||
a8db8453 GOC |
1344 | /* |
1345 | * Early setup to make printk work. | |
1346 | */ | |
1347 | void __init native_smp_prepare_boot_cpu(void) | |
1348 | { | |
1349 | int me = smp_processor_id(); | |
552be871 | 1350 | switch_to_new_gdt(me); |
c2d1cec1 MT |
1351 | /* already set me in cpu_online_mask in boot_cpu_init() */ |
1352 | cpumask_set_cpu(me, cpu_callout_mask); | |
2a442c9c | 1353 | cpu_set_state_online(me); |
a8db8453 GOC |
1354 | } |
1355 | ||
83f7eb9c GOC |
1356 | void __init native_smp_cpus_done(unsigned int max_cpus) |
1357 | { | |
c767a54b | 1358 | pr_debug("Boot done\n"); |
83f7eb9c | 1359 | |
99e8b9ca | 1360 | nmi_selftest(); |
83f7eb9c | 1361 | impress_friends(); |
83f7eb9c | 1362 | setup_ioapic_dest(); |
d0af9eed | 1363 | mtrr_aps_init(); |
83f7eb9c GOC |
1364 | } |
1365 | ||
3b11ce7f MT |
1366 | static int __initdata setup_possible_cpus = -1; |
1367 | static int __init _setup_possible_cpus(char *str) | |
1368 | { | |
1369 | get_option(&str, &setup_possible_cpus); | |
1370 | return 0; | |
1371 | } | |
1372 | early_param("possible_cpus", _setup_possible_cpus); | |
1373 | ||
1374 | ||
68a1c3f8 | 1375 | /* |
4f062896 | 1376 | * cpu_possible_mask should be static, it cannot change as cpu's |
68a1c3f8 GC |
1377 | * are onlined, or offlined. The reason is per-cpu data-structures |
1378 | * are allocated by some modules at init time, and dont expect to | |
1379 | * do this dynamically on cpu arrival/departure. | |
4f062896 | 1380 | * cpu_present_mask on the other hand can change dynamically. |
68a1c3f8 GC |
1381 | * In case when cpu_hotplug is not compiled, then we resort to current |
1382 | * behaviour, which is cpu_possible == cpu_present. | |
1383 | * - Ashok Raj | |
1384 | * | |
1385 | * Three ways to find out the number of additional hotplug CPUs: | |
1386 | * - If the BIOS specified disabled CPUs in ACPI/mptables use that. | |
3b11ce7f | 1387 | * - The user can overwrite it with possible_cpus=NUM |
68a1c3f8 GC |
1388 | * - Otherwise don't reserve additional CPUs. |
1389 | * We do this because additional CPUs waste a lot of memory. | |
1390 | * -AK | |
1391 | */ | |
1392 | __init void prefill_possible_map(void) | |
1393 | { | |
cb48bb59 | 1394 | int i, possible; |
68a1c3f8 | 1395 | |
329513a3 YL |
1396 | /* no processor from mptable or madt */ |
1397 | if (!num_processors) | |
1398 | num_processors = 1; | |
1399 | ||
5f2eb550 JB |
1400 | i = setup_max_cpus ?: 1; |
1401 | if (setup_possible_cpus == -1) { | |
1402 | possible = num_processors; | |
1403 | #ifdef CONFIG_HOTPLUG_CPU | |
1404 | if (setup_max_cpus) | |
1405 | possible += disabled_cpus; | |
1406 | #else | |
1407 | if (possible > i) | |
1408 | possible = i; | |
1409 | #endif | |
1410 | } else | |
3b11ce7f MT |
1411 | possible = setup_possible_cpus; |
1412 | ||
730cf272 MT |
1413 | total_cpus = max_t(int, possible, num_processors + disabled_cpus); |
1414 | ||
2b633e3f YL |
1415 | /* nr_cpu_ids could be reduced via nr_cpus= */ |
1416 | if (possible > nr_cpu_ids) { | |
c767a54b | 1417 | pr_warn("%d Processors exceeds NR_CPUS limit of %d\n", |
2b633e3f YL |
1418 | possible, nr_cpu_ids); |
1419 | possible = nr_cpu_ids; | |
3b11ce7f | 1420 | } |
68a1c3f8 | 1421 | |
5f2eb550 JB |
1422 | #ifdef CONFIG_HOTPLUG_CPU |
1423 | if (!setup_max_cpus) | |
1424 | #endif | |
1425 | if (possible > i) { | |
c767a54b | 1426 | pr_warn("%d Processors exceeds max_cpus limit of %u\n", |
5f2eb550 JB |
1427 | possible, setup_max_cpus); |
1428 | possible = i; | |
1429 | } | |
1430 | ||
c767a54b | 1431 | pr_info("Allowing %d CPUs, %d hotplug CPUs\n", |
68a1c3f8 GC |
1432 | possible, max_t(int, possible - num_processors, 0)); |
1433 | ||
1434 | for (i = 0; i < possible; i++) | |
c2d1cec1 | 1435 | set_cpu_possible(i, true); |
5f2eb550 JB |
1436 | for (; i < NR_CPUS; i++) |
1437 | set_cpu_possible(i, false); | |
3461b0af MT |
1438 | |
1439 | nr_cpu_ids = possible; | |
68a1c3f8 | 1440 | } |
69c18c15 | 1441 | |
14adf855 CE |
1442 | #ifdef CONFIG_HOTPLUG_CPU |
1443 | ||
1444 | static void remove_siblinginfo(int cpu) | |
1445 | { | |
1446 | int sibling; | |
1447 | struct cpuinfo_x86 *c = &cpu_data(cpu); | |
1448 | ||
7d79a7bd BG |
1449 | for_each_cpu(sibling, topology_core_cpumask(cpu)) { |
1450 | cpumask_clear_cpu(cpu, topology_core_cpumask(sibling)); | |
14adf855 CE |
1451 | /*/ |
1452 | * last thread sibling in this cpu core going down | |
1453 | */ | |
7d79a7bd | 1454 | if (cpumask_weight(topology_sibling_cpumask(cpu)) == 1) |
14adf855 CE |
1455 | cpu_data(sibling).booted_cores--; |
1456 | } | |
1457 | ||
7d79a7bd BG |
1458 | for_each_cpu(sibling, topology_sibling_cpumask(cpu)) |
1459 | cpumask_clear_cpu(cpu, topology_sibling_cpumask(sibling)); | |
03bd4e1f WL |
1460 | for_each_cpu(sibling, cpu_llc_shared_mask(cpu)) |
1461 | cpumask_clear_cpu(cpu, cpu_llc_shared_mask(sibling)); | |
1462 | cpumask_clear(cpu_llc_shared_mask(cpu)); | |
7d79a7bd BG |
1463 | cpumask_clear(topology_sibling_cpumask(cpu)); |
1464 | cpumask_clear(topology_core_cpumask(cpu)); | |
14adf855 CE |
1465 | c->phys_proc_id = 0; |
1466 | c->cpu_core_id = 0; | |
c2d1cec1 | 1467 | cpumask_clear_cpu(cpu, cpu_sibling_setup_mask); |
14adf855 CE |
1468 | } |
1469 | ||
4daa832d | 1470 | static void remove_cpu_from_maps(int cpu) |
69c18c15 | 1471 | { |
c2d1cec1 MT |
1472 | set_cpu_online(cpu, false); |
1473 | cpumask_clear_cpu(cpu, cpu_callout_mask); | |
1474 | cpumask_clear_cpu(cpu, cpu_callin_mask); | |
69c18c15 | 1475 | /* was set by cpu_init() */ |
c2d1cec1 | 1476 | cpumask_clear_cpu(cpu, cpu_initialized_mask); |
23ca4bba | 1477 | numa_remove_cpu(cpu); |
69c18c15 GC |
1478 | } |
1479 | ||
8227dce7 | 1480 | void cpu_disable_common(void) |
69c18c15 GC |
1481 | { |
1482 | int cpu = smp_processor_id(); | |
69c18c15 | 1483 | |
69c18c15 GC |
1484 | remove_siblinginfo(cpu); |
1485 | ||
1486 | /* It's now safe to remove this processor from the online map */ | |
d388e5fd | 1487 | lock_vector_lock(); |
69c18c15 | 1488 | remove_cpu_from_maps(cpu); |
d388e5fd | 1489 | unlock_vector_lock(); |
d7b381bb | 1490 | fixup_irqs(); |
8227dce7 AN |
1491 | } |
1492 | ||
1493 | int native_cpu_disable(void) | |
1494 | { | |
da6139e4 PB |
1495 | int ret; |
1496 | ||
1497 | ret = check_irq_vectors_for_cpu_disable(); | |
1498 | if (ret) | |
1499 | return ret; | |
1500 | ||
8227dce7 | 1501 | clear_local_APIC(); |
8227dce7 | 1502 | cpu_disable_common(); |
2ed53c0d | 1503 | |
69c18c15 GC |
1504 | return 0; |
1505 | } | |
1506 | ||
2a442c9c | 1507 | int common_cpu_die(unsigned int cpu) |
54279552 | 1508 | { |
2a442c9c | 1509 | int ret = 0; |
54279552 | 1510 | |
69c18c15 | 1511 | /* We don't do anything here: idle task is faking death itself. */ |
54279552 | 1512 | |
2ed53c0d | 1513 | /* They ack this in play_dead() by setting CPU_DEAD */ |
2a442c9c | 1514 | if (cpu_wait_death(cpu, 5)) { |
2ed53c0d LT |
1515 | if (system_state == SYSTEM_RUNNING) |
1516 | pr_info("CPU %u is now offline\n", cpu); | |
1517 | } else { | |
1518 | pr_err("CPU %u didn't die...\n", cpu); | |
2a442c9c | 1519 | ret = -1; |
69c18c15 | 1520 | } |
2a442c9c PM |
1521 | |
1522 | return ret; | |
1523 | } | |
1524 | ||
1525 | void native_cpu_die(unsigned int cpu) | |
1526 | { | |
1527 | common_cpu_die(cpu); | |
69c18c15 | 1528 | } |
a21f5d88 AN |
1529 | |
1530 | void play_dead_common(void) | |
1531 | { | |
1532 | idle_task_exit(); | |
1533 | reset_lazy_tlbstate(); | |
02c68a02 | 1534 | amd_e400_remove_cpu(raw_smp_processor_id()); |
a21f5d88 | 1535 | |
a21f5d88 | 1536 | /* Ack it */ |
2a442c9c | 1537 | (void)cpu_report_death(); |
a21f5d88 AN |
1538 | |
1539 | /* | |
1540 | * With physical CPU hotplug, we should halt the cpu | |
1541 | */ | |
1542 | local_irq_disable(); | |
1543 | } | |
1544 | ||
e1c467e6 FY |
1545 | static bool wakeup_cpu0(void) |
1546 | { | |
1547 | if (smp_processor_id() == 0 && enable_start_cpu0) | |
1548 | return true; | |
1549 | ||
1550 | return false; | |
1551 | } | |
1552 | ||
ea530692 PA |
1553 | /* |
1554 | * We need to flush the caches before going to sleep, lest we have | |
1555 | * dirty data in our caches when we come back up. | |
1556 | */ | |
1557 | static inline void mwait_play_dead(void) | |
1558 | { | |
1559 | unsigned int eax, ebx, ecx, edx; | |
1560 | unsigned int highest_cstate = 0; | |
1561 | unsigned int highest_subcstate = 0; | |
ce5f6824 | 1562 | void *mwait_ptr; |
576cfb40 | 1563 | int i; |
ea530692 | 1564 | |
69fb3676 | 1565 | if (!this_cpu_has(X86_FEATURE_MWAIT)) |
ea530692 | 1566 | return; |
840d2830 | 1567 | if (!this_cpu_has(X86_FEATURE_CLFLUSH)) |
ce5f6824 | 1568 | return; |
7b543a53 | 1569 | if (__this_cpu_read(cpu_info.cpuid_level) < CPUID_MWAIT_LEAF) |
ea530692 PA |
1570 | return; |
1571 | ||
1572 | eax = CPUID_MWAIT_LEAF; | |
1573 | ecx = 0; | |
1574 | native_cpuid(&eax, &ebx, &ecx, &edx); | |
1575 | ||
1576 | /* | |
1577 | * eax will be 0 if EDX enumeration is not valid. | |
1578 | * Initialized below to cstate, sub_cstate value when EDX is valid. | |
1579 | */ | |
1580 | if (!(ecx & CPUID5_ECX_EXTENSIONS_SUPPORTED)) { | |
1581 | eax = 0; | |
1582 | } else { | |
1583 | edx >>= MWAIT_SUBSTATE_SIZE; | |
1584 | for (i = 0; i < 7 && edx; i++, edx >>= MWAIT_SUBSTATE_SIZE) { | |
1585 | if (edx & MWAIT_SUBSTATE_MASK) { | |
1586 | highest_cstate = i; | |
1587 | highest_subcstate = edx & MWAIT_SUBSTATE_MASK; | |
1588 | } | |
1589 | } | |
1590 | eax = (highest_cstate << MWAIT_SUBSTATE_SIZE) | | |
1591 | (highest_subcstate - 1); | |
1592 | } | |
1593 | ||
ce5f6824 PA |
1594 | /* |
1595 | * This should be a memory location in a cache line which is | |
1596 | * unlikely to be touched by other processors. The actual | |
1597 | * content is immaterial as it is not actually modified in any way. | |
1598 | */ | |
1599 | mwait_ptr = ¤t_thread_info()->flags; | |
1600 | ||
a68e5c94 PA |
1601 | wbinvd(); |
1602 | ||
ea530692 | 1603 | while (1) { |
ce5f6824 PA |
1604 | /* |
1605 | * The CLFLUSH is a workaround for erratum AAI65 for | |
1606 | * the Xeon 7400 series. It's not clear it is actually | |
1607 | * needed, but it should be harmless in either case. | |
1608 | * The WBINVD is insufficient due to the spurious-wakeup | |
1609 | * case where we return around the loop. | |
1610 | */ | |
7d590cca | 1611 | mb(); |
ce5f6824 | 1612 | clflush(mwait_ptr); |
7d590cca | 1613 | mb(); |
ce5f6824 | 1614 | __monitor(mwait_ptr, 0, 0); |
ea530692 PA |
1615 | mb(); |
1616 | __mwait(eax, 0); | |
e1c467e6 FY |
1617 | /* |
1618 | * If NMI wants to wake up CPU0, start CPU0. | |
1619 | */ | |
1620 | if (wakeup_cpu0()) | |
1621 | start_cpu0(); | |
ea530692 PA |
1622 | } |
1623 | } | |
1624 | ||
1625 | static inline void hlt_play_dead(void) | |
1626 | { | |
7b543a53 | 1627 | if (__this_cpu_read(cpu_info.x86) >= 4) |
a68e5c94 PA |
1628 | wbinvd(); |
1629 | ||
ea530692 | 1630 | while (1) { |
ea530692 | 1631 | native_halt(); |
e1c467e6 FY |
1632 | /* |
1633 | * If NMI wants to wake up CPU0, start CPU0. | |
1634 | */ | |
1635 | if (wakeup_cpu0()) | |
1636 | start_cpu0(); | |
ea530692 PA |
1637 | } |
1638 | } | |
1639 | ||
a21f5d88 AN |
1640 | void native_play_dead(void) |
1641 | { | |
1642 | play_dead_common(); | |
86886e55 | 1643 | tboot_shutdown(TB_SHUTDOWN_WFS); |
ea530692 PA |
1644 | |
1645 | mwait_play_dead(); /* Only returns on failure */ | |
1a022e3f BO |
1646 | if (cpuidle_play_dead()) |
1647 | hlt_play_dead(); | |
a21f5d88 AN |
1648 | } |
1649 | ||
69c18c15 | 1650 | #else /* ... !CONFIG_HOTPLUG_CPU */ |
93be71b6 | 1651 | int native_cpu_disable(void) |
69c18c15 GC |
1652 | { |
1653 | return -ENOSYS; | |
1654 | } | |
1655 | ||
93be71b6 | 1656 | void native_cpu_die(unsigned int cpu) |
69c18c15 GC |
1657 | { |
1658 | /* We said "no" in __cpu_disable */ | |
1659 | BUG(); | |
1660 | } | |
a21f5d88 AN |
1661 | |
1662 | void native_play_dead(void) | |
1663 | { | |
1664 | BUG(); | |
1665 | } | |
1666 | ||
68a1c3f8 | 1667 | #endif |