Commit | Line | Data |
---|---|---|
4cedb334 GOC |
1 | /* |
2 | * x86 SMP booting functions | |
3 | * | |
4 | * (c) 1995 Alan Cox, Building #3 <alan@redhat.com> | |
5 | * (c) 1998, 1999, 2000 Ingo Molnar <mingo@redhat.com> | |
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 | ||
68a1c3f8 GC |
42 | #include <linux/init.h> |
43 | #include <linux/smp.h> | |
a355352b | 44 | #include <linux/module.h> |
70708a18 | 45 | #include <linux/sched.h> |
69c18c15 | 46 | #include <linux/percpu.h> |
91718e8d | 47 | #include <linux/bootmem.h> |
cb3c8b90 GOC |
48 | #include <linux/err.h> |
49 | #include <linux/nmi.h> | |
69c18c15 | 50 | |
8aef135c | 51 | #include <asm/acpi.h> |
cb3c8b90 | 52 | #include <asm/desc.h> |
69c18c15 GC |
53 | #include <asm/nmi.h> |
54 | #include <asm/irq.h> | |
07bbc16a | 55 | #include <asm/idle.h> |
69c18c15 | 56 | #include <asm/smp.h> |
e44b7b75 | 57 | #include <asm/trampoline.h> |
69c18c15 GC |
58 | #include <asm/cpu.h> |
59 | #include <asm/numa.h> | |
cb3c8b90 GOC |
60 | #include <asm/pgtable.h> |
61 | #include <asm/tlbflush.h> | |
62 | #include <asm/mtrr.h> | |
bbc2ff6a | 63 | #include <asm/vmi.h> |
34d05591 | 64 | #include <asm/genapic.h> |
cb3c8b90 | 65 | #include <linux/mc146818rtc.h> |
68a1c3f8 | 66 | |
f6bc4029 | 67 | #include <mach_apic.h> |
cb3c8b90 GOC |
68 | #include <mach_wakecpu.h> |
69 | #include <smpboot_hooks.h> | |
70 | ||
16ecf7a4 | 71 | #ifdef CONFIG_X86_32 |
4cedb334 | 72 | u8 apicid_2_node[MAX_APICID]; |
61165d7a | 73 | static int low_mappings; |
acbb6734 GOC |
74 | #endif |
75 | ||
a8db8453 GOC |
76 | /* State of each CPU */ |
77 | DEFINE_PER_CPU(int, cpu_state) = { 0 }; | |
78 | ||
cb3c8b90 GOC |
79 | /* 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 | */ | |
88 | static 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 | |
f86c9985 | 92 | static struct task_struct *idle_thread_array[NR_CPUS] __cpuinitdata ; |
cb3c8b90 GOC |
93 | #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 | |
f6bc4029 | 96 | |
a355352b GC |
97 | /* Number of siblings per CPU package */ |
98 | int smp_num_siblings = 1; | |
99 | EXPORT_SYMBOL(smp_num_siblings); | |
100 | ||
101 | /* Last level cache ID of each logical CPU */ | |
102 | DEFINE_PER_CPU(u16, cpu_llc_id) = BAD_APICID; | |
103 | ||
a355352b GC |
104 | cpumask_t cpu_callin_map; |
105 | cpumask_t cpu_callout_map; | |
a355352b GC |
106 | |
107 | /* representing HT siblings of each logical CPU */ | |
108 | DEFINE_PER_CPU(cpumask_t, cpu_sibling_map); | |
109 | EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); | |
110 | ||
111 | /* representing HT and core siblings of each logical CPU */ | |
112 | DEFINE_PER_CPU(cpumask_t, cpu_core_map); | |
113 | EXPORT_PER_CPU_SYMBOL(cpu_core_map); | |
114 | ||
115 | /* Per CPU bogomips and other parameters */ | |
116 | DEFINE_PER_CPU_SHARED_ALIGNED(struct cpuinfo_x86, cpu_info); | |
117 | EXPORT_PER_CPU_SYMBOL(cpu_info); | |
768d9505 | 118 | |
cb3c8b90 GOC |
119 | static atomic_t init_deasserted; |
120 | ||
8aef135c | 121 | |
768d9505 GC |
122 | /* representing cpus for which sibling maps can be computed */ |
123 | static cpumask_t cpu_sibling_setup_map; | |
124 | ||
1d89a7f0 | 125 | /* Set if we find a B stepping CPU */ |
f86c9985 | 126 | static int __cpuinitdata smp_b_stepping; |
1d89a7f0 | 127 | |
7cc3959e GOC |
128 | #if defined(CONFIG_NUMA) && defined(CONFIG_X86_32) |
129 | ||
130 | /* which logical CPUs are on which nodes */ | |
131 | cpumask_t node_to_cpumask_map[MAX_NUMNODES] __read_mostly = | |
132 | { [0 ... MAX_NUMNODES-1] = CPU_MASK_NONE }; | |
133 | EXPORT_SYMBOL(node_to_cpumask_map); | |
134 | /* which node each logical CPU is on */ | |
135 | int cpu_to_node_map[NR_CPUS] __read_mostly = { [0 ... NR_CPUS-1] = 0 }; | |
136 | EXPORT_SYMBOL(cpu_to_node_map); | |
137 | ||
138 | /* set up a mapping between cpu and node. */ | |
139 | static void map_cpu_to_node(int cpu, int node) | |
140 | { | |
141 | printk(KERN_INFO "Mapping cpu %d to node %d\n", cpu, node); | |
142 | cpu_set(cpu, node_to_cpumask_map[node]); | |
143 | cpu_to_node_map[cpu] = node; | |
144 | } | |
145 | ||
146 | /* undo a mapping between cpu and node. */ | |
147 | static void unmap_cpu_to_node(int cpu) | |
148 | { | |
149 | int node; | |
150 | ||
151 | printk(KERN_INFO "Unmapping cpu %d from all nodes\n", cpu); | |
152 | for (node = 0; node < MAX_NUMNODES; node++) | |
153 | cpu_clear(cpu, node_to_cpumask_map[node]); | |
154 | cpu_to_node_map[cpu] = 0; | |
155 | } | |
156 | #else /* !(CONFIG_NUMA && CONFIG_X86_32) */ | |
157 | #define map_cpu_to_node(cpu, node) ({}) | |
158 | #define unmap_cpu_to_node(cpu) ({}) | |
159 | #endif | |
160 | ||
161 | #ifdef CONFIG_X86_32 | |
1b374e4d SS |
162 | static int boot_cpu_logical_apicid; |
163 | ||
7cc3959e GOC |
164 | u8 cpu_2_logical_apicid[NR_CPUS] __read_mostly = |
165 | { [0 ... NR_CPUS-1] = BAD_APICID }; | |
166 | ||
a4928cff | 167 | static void map_cpu_to_logical_apicid(void) |
7cc3959e GOC |
168 | { |
169 | int cpu = smp_processor_id(); | |
170 | int apicid = logical_smp_processor_id(); | |
171 | int node = apicid_to_node(apicid); | |
172 | ||
173 | if (!node_online(node)) | |
174 | node = first_online_node; | |
175 | ||
176 | cpu_2_logical_apicid[cpu] = apicid; | |
177 | map_cpu_to_node(cpu, node); | |
178 | } | |
179 | ||
1481a3dd | 180 | void numa_remove_cpu(int cpu) |
7cc3959e GOC |
181 | { |
182 | cpu_2_logical_apicid[cpu] = BAD_APICID; | |
183 | unmap_cpu_to_node(cpu); | |
184 | } | |
185 | #else | |
7cc3959e GOC |
186 | #define map_cpu_to_logical_apicid() do {} while (0) |
187 | #endif | |
188 | ||
cb3c8b90 GOC |
189 | /* |
190 | * Report back to the Boot Processor. | |
191 | * Running on AP. | |
192 | */ | |
a4928cff | 193 | static void __cpuinit smp_callin(void) |
cb3c8b90 GOC |
194 | { |
195 | int cpuid, phys_id; | |
196 | unsigned long timeout; | |
197 | ||
198 | /* | |
199 | * If waken up by an INIT in an 82489DX configuration | |
200 | * we may get here before an INIT-deassert IPI reaches | |
201 | * our local APIC. We have to wait for the IPI or we'll | |
202 | * lock up on an APIC access. | |
203 | */ | |
204 | wait_for_init_deassert(&init_deasserted); | |
205 | ||
206 | /* | |
207 | * (This works even if the APIC is not enabled.) | |
208 | */ | |
4c9961d5 | 209 | phys_id = read_apic_id(); |
cb3c8b90 GOC |
210 | cpuid = smp_processor_id(); |
211 | if (cpu_isset(cpuid, cpu_callin_map)) { | |
212 | panic("%s: phys CPU#%d, CPU#%d already present??\n", __func__, | |
213 | phys_id, cpuid); | |
214 | } | |
cfc1b9a6 | 215 | pr_debug("CPU#%d (phys ID: %d) waiting for CALLOUT\n", cpuid, phys_id); |
cb3c8b90 GOC |
216 | |
217 | /* | |
218 | * STARTUP IPIs are fragile beasts as they might sometimes | |
219 | * trigger some glue motherboard logic. Complete APIC bus | |
220 | * silence for 1 second, this overestimates the time the | |
221 | * boot CPU is spending to send the up to 2 STARTUP IPIs | |
222 | * by a factor of two. This should be enough. | |
223 | */ | |
224 | ||
225 | /* | |
226 | * Waiting 2s total for startup (udelay is not yet working) | |
227 | */ | |
228 | timeout = jiffies + 2*HZ; | |
229 | while (time_before(jiffies, timeout)) { | |
230 | /* | |
231 | * Has the boot CPU finished it's STARTUP sequence? | |
232 | */ | |
233 | if (cpu_isset(cpuid, cpu_callout_map)) | |
234 | break; | |
235 | cpu_relax(); | |
236 | } | |
237 | ||
238 | if (!time_before(jiffies, timeout)) { | |
239 | panic("%s: CPU%d started up but did not get a callout!\n", | |
240 | __func__, cpuid); | |
241 | } | |
242 | ||
243 | /* | |
244 | * the boot CPU has finished the init stage and is spinning | |
245 | * on callin_map until we finish. We are free to set up this | |
246 | * CPU, first the APIC. (this is probably redundant on most | |
247 | * boards) | |
248 | */ | |
249 | ||
cfc1b9a6 | 250 | pr_debug("CALLIN, before setup_local_APIC().\n"); |
cb3c8b90 GOC |
251 | smp_callin_clear_local_apic(); |
252 | setup_local_APIC(); | |
253 | end_local_APIC_setup(); | |
254 | map_cpu_to_logical_apicid(); | |
255 | ||
e545a614 | 256 | notify_cpu_starting(cpuid); |
cb3c8b90 GOC |
257 | /* |
258 | * Get our bogomips. | |
259 | * | |
260 | * Need to enable IRQs because it can take longer and then | |
261 | * the NMI watchdog might kill us. | |
262 | */ | |
263 | local_irq_enable(); | |
264 | calibrate_delay(); | |
265 | local_irq_disable(); | |
cfc1b9a6 | 266 | pr_debug("Stack at about %p\n", &cpuid); |
cb3c8b90 GOC |
267 | |
268 | /* | |
269 | * Save our processor parameters | |
270 | */ | |
271 | smp_store_cpu_info(cpuid); | |
272 | ||
273 | /* | |
274 | * Allow the master to continue. | |
275 | */ | |
276 | cpu_set(cpuid, cpu_callin_map); | |
277 | } | |
278 | ||
25ddbb18 AK |
279 | static int __cpuinitdata unsafe_smp; |
280 | ||
bbc2ff6a GOC |
281 | /* |
282 | * Activate a secondary processor. | |
283 | */ | |
dbe55f47 | 284 | static void __cpuinit start_secondary(void *unused) |
bbc2ff6a GOC |
285 | { |
286 | /* | |
287 | * Don't put *anything* before cpu_init(), SMP booting is too | |
288 | * fragile that we want to limit the things done here to the | |
289 | * most necessary things. | |
290 | */ | |
291 | #ifdef CONFIG_VMI | |
292 | vmi_bringup(); | |
293 | #endif | |
294 | cpu_init(); | |
295 | preempt_disable(); | |
296 | smp_callin(); | |
297 | ||
298 | /* otherwise gcc will move up smp_processor_id before the cpu_init */ | |
299 | barrier(); | |
300 | /* | |
301 | * Check TSC synchronization with the BP: | |
302 | */ | |
303 | check_tsc_sync_target(); | |
304 | ||
305 | if (nmi_watchdog == NMI_IO_APIC) { | |
306 | disable_8259A_irq(0); | |
307 | enable_NMI_through_LVT0(); | |
308 | enable_8259A_irq(0); | |
309 | } | |
310 | ||
61165d7a HD |
311 | #ifdef CONFIG_X86_32 |
312 | while (low_mappings) | |
313 | cpu_relax(); | |
314 | __flush_tlb_all(); | |
315 | #endif | |
316 | ||
bbc2ff6a GOC |
317 | /* This must be done before setting cpu_online_map */ |
318 | set_cpu_sibling_map(raw_smp_processor_id()); | |
319 | wmb(); | |
320 | ||
321 | /* | |
322 | * We need to hold call_lock, so there is no inconsistency | |
323 | * between the time smp_call_function() determines number of | |
324 | * IPI recipients, and the time when the determination is made | |
325 | * for which cpus receive the IPI. Holding this | |
326 | * lock helps us to not include this cpu in a currently in progress | |
327 | * smp_call_function(). | |
d388e5fd EB |
328 | * |
329 | * We need to hold vector_lock so there the set of online cpus | |
330 | * does not change while we are assigning vectors to cpus. Holding | |
331 | * this lock ensures we don't half assign or remove an irq from a cpu. | |
bbc2ff6a | 332 | */ |
0cefa5b9 | 333 | ipi_call_lock(); |
d388e5fd EB |
334 | lock_vector_lock(); |
335 | __setup_vector_irq(smp_processor_id()); | |
bbc2ff6a | 336 | cpu_set(smp_processor_id(), cpu_online_map); |
d388e5fd | 337 | unlock_vector_lock(); |
0cefa5b9 | 338 | ipi_call_unlock(); |
bbc2ff6a GOC |
339 | per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE; |
340 | ||
0cefa5b9 MS |
341 | /* enable local interrupts */ |
342 | local_irq_enable(); | |
343 | ||
bbc2ff6a GOC |
344 | setup_secondary_clock(); |
345 | ||
346 | wmb(); | |
347 | cpu_idle(); | |
348 | } | |
349 | ||
1d89a7f0 GOC |
350 | static void __cpuinit smp_apply_quirks(struct cpuinfo_x86 *c) |
351 | { | |
1d89a7f0 GOC |
352 | /* |
353 | * Mask B, Pentium, but not Pentium MMX | |
354 | */ | |
355 | if (c->x86_vendor == X86_VENDOR_INTEL && | |
356 | c->x86 == 5 && | |
357 | c->x86_mask >= 1 && c->x86_mask <= 4 && | |
358 | c->x86_model <= 3) | |
359 | /* | |
360 | * Remember we have B step Pentia with bugs | |
361 | */ | |
362 | smp_b_stepping = 1; | |
363 | ||
364 | /* | |
365 | * Certain Athlons might work (for various values of 'work') in SMP | |
366 | * but they are not certified as MP capable. | |
367 | */ | |
368 | if ((c->x86_vendor == X86_VENDOR_AMD) && (c->x86 == 6)) { | |
369 | ||
370 | if (num_possible_cpus() == 1) | |
371 | goto valid_k7; | |
372 | ||
373 | /* Athlon 660/661 is valid. */ | |
374 | if ((c->x86_model == 6) && ((c->x86_mask == 0) || | |
375 | (c->x86_mask == 1))) | |
376 | goto valid_k7; | |
377 | ||
378 | /* Duron 670 is valid */ | |
379 | if ((c->x86_model == 7) && (c->x86_mask == 0)) | |
380 | goto valid_k7; | |
381 | ||
382 | /* | |
383 | * Athlon 662, Duron 671, and Athlon >model 7 have capability | |
384 | * bit. It's worth noting that the A5 stepping (662) of some | |
385 | * Athlon XP's have the MP bit set. | |
386 | * See http://www.heise.de/newsticker/data/jow-18.10.01-000 for | |
387 | * more. | |
388 | */ | |
389 | if (((c->x86_model == 6) && (c->x86_mask >= 2)) || | |
390 | ((c->x86_model == 7) && (c->x86_mask >= 1)) || | |
391 | (c->x86_model > 7)) | |
392 | if (cpu_has_mp) | |
393 | goto valid_k7; | |
394 | ||
395 | /* If we get here, not a certified SMP capable AMD system. */ | |
25ddbb18 | 396 | unsafe_smp = 1; |
1d89a7f0 GOC |
397 | } |
398 | ||
399 | valid_k7: | |
400 | ; | |
1d89a7f0 GOC |
401 | } |
402 | ||
a4928cff | 403 | static void __cpuinit smp_checks(void) |
693d4b8a GOC |
404 | { |
405 | if (smp_b_stepping) | |
406 | printk(KERN_WARNING "WARNING: SMP operation may be unreliable" | |
407 | "with B stepping processors.\n"); | |
408 | ||
409 | /* | |
410 | * Don't taint if we are running SMP kernel on a single non-MP | |
411 | * approved Athlon | |
412 | */ | |
25ddbb18 AK |
413 | if (unsafe_smp && num_online_cpus() > 1) { |
414 | printk(KERN_INFO "WARNING: This combination of AMD" | |
415 | "processors is not suitable for SMP.\n"); | |
416 | add_taint(TAINT_UNSAFE_SMP); | |
693d4b8a GOC |
417 | } |
418 | } | |
419 | ||
1d89a7f0 GOC |
420 | /* |
421 | * The bootstrap kernel entry code has set these up. Save them for | |
422 | * a given CPU | |
423 | */ | |
424 | ||
425 | void __cpuinit smp_store_cpu_info(int id) | |
426 | { | |
427 | struct cpuinfo_x86 *c = &cpu_data(id); | |
428 | ||
429 | *c = boot_cpu_data; | |
430 | c->cpu_index = id; | |
431 | if (id != 0) | |
432 | identify_secondary_cpu(c); | |
433 | smp_apply_quirks(c); | |
434 | } | |
435 | ||
436 | ||
768d9505 GC |
437 | void __cpuinit set_cpu_sibling_map(int cpu) |
438 | { | |
439 | int i; | |
440 | struct cpuinfo_x86 *c = &cpu_data(cpu); | |
441 | ||
442 | cpu_set(cpu, cpu_sibling_setup_map); | |
443 | ||
444 | if (smp_num_siblings > 1) { | |
334ef7a7 | 445 | for_each_cpu_mask_nr(i, cpu_sibling_setup_map) { |
768d9505 GC |
446 | if (c->phys_proc_id == cpu_data(i).phys_proc_id && |
447 | c->cpu_core_id == cpu_data(i).cpu_core_id) { | |
448 | cpu_set(i, per_cpu(cpu_sibling_map, cpu)); | |
449 | cpu_set(cpu, per_cpu(cpu_sibling_map, i)); | |
450 | cpu_set(i, per_cpu(cpu_core_map, cpu)); | |
451 | cpu_set(cpu, per_cpu(cpu_core_map, i)); | |
452 | cpu_set(i, c->llc_shared_map); | |
453 | cpu_set(cpu, cpu_data(i).llc_shared_map); | |
454 | } | |
455 | } | |
456 | } else { | |
457 | cpu_set(cpu, per_cpu(cpu_sibling_map, cpu)); | |
458 | } | |
459 | ||
460 | cpu_set(cpu, c->llc_shared_map); | |
461 | ||
462 | if (current_cpu_data.x86_max_cores == 1) { | |
463 | per_cpu(cpu_core_map, cpu) = per_cpu(cpu_sibling_map, cpu); | |
464 | c->booted_cores = 1; | |
465 | return; | |
466 | } | |
467 | ||
334ef7a7 | 468 | for_each_cpu_mask_nr(i, cpu_sibling_setup_map) { |
768d9505 GC |
469 | if (per_cpu(cpu_llc_id, cpu) != BAD_APICID && |
470 | per_cpu(cpu_llc_id, cpu) == per_cpu(cpu_llc_id, i)) { | |
471 | cpu_set(i, c->llc_shared_map); | |
472 | cpu_set(cpu, cpu_data(i).llc_shared_map); | |
473 | } | |
474 | if (c->phys_proc_id == cpu_data(i).phys_proc_id) { | |
475 | cpu_set(i, per_cpu(cpu_core_map, cpu)); | |
476 | cpu_set(cpu, per_cpu(cpu_core_map, i)); | |
477 | /* | |
478 | * Does this new cpu bringup a new core? | |
479 | */ | |
480 | if (cpus_weight(per_cpu(cpu_sibling_map, cpu)) == 1) { | |
481 | /* | |
482 | * for each core in package, increment | |
483 | * the booted_cores for this new cpu | |
484 | */ | |
485 | if (first_cpu(per_cpu(cpu_sibling_map, i)) == i) | |
486 | c->booted_cores++; | |
487 | /* | |
488 | * increment the core count for all | |
489 | * the other cpus in this package | |
490 | */ | |
491 | if (i != cpu) | |
492 | cpu_data(i).booted_cores++; | |
493 | } else if (i != cpu && !c->booted_cores) | |
494 | c->booted_cores = cpu_data(i).booted_cores; | |
495 | } | |
496 | } | |
497 | } | |
498 | ||
70708a18 GC |
499 | /* maps the cpu to the sched domain representing multi-core */ |
500 | cpumask_t cpu_coregroup_map(int cpu) | |
501 | { | |
502 | struct cpuinfo_x86 *c = &cpu_data(cpu); | |
503 | /* | |
504 | * For perf, we return last level cache shared map. | |
505 | * And for power savings, we return cpu_core_map | |
506 | */ | |
507 | if (sched_mc_power_savings || sched_smt_power_savings) | |
508 | return per_cpu(cpu_core_map, cpu); | |
509 | else | |
510 | return c->llc_shared_map; | |
511 | } | |
512 | ||
a4928cff | 513 | static void impress_friends(void) |
904541e2 GOC |
514 | { |
515 | int cpu; | |
516 | unsigned long bogosum = 0; | |
517 | /* | |
518 | * Allow the user to impress friends. | |
519 | */ | |
cfc1b9a6 | 520 | pr_debug("Before bogomips.\n"); |
904541e2 GOC |
521 | for_each_possible_cpu(cpu) |
522 | if (cpu_isset(cpu, cpu_callout_map)) | |
523 | bogosum += cpu_data(cpu).loops_per_jiffy; | |
524 | printk(KERN_INFO | |
525 | "Total of %d processors activated (%lu.%02lu BogoMIPS).\n", | |
f68e00a3 | 526 | num_online_cpus(), |
904541e2 GOC |
527 | bogosum/(500000/HZ), |
528 | (bogosum/(5000/HZ))%100); | |
529 | ||
cfc1b9a6 | 530 | pr_debug("Before bogocount - setting activated=1.\n"); |
904541e2 GOC |
531 | } |
532 | ||
cb3c8b90 GOC |
533 | static inline void __inquire_remote_apic(int apicid) |
534 | { | |
535 | unsigned i, regs[] = { APIC_ID >> 4, APIC_LVR >> 4, APIC_SPIV >> 4 }; | |
536 | char *names[] = { "ID", "VERSION", "SPIV" }; | |
537 | int timeout; | |
538 | u32 status; | |
539 | ||
823b259b | 540 | printk(KERN_INFO "Inquiring remote APIC 0x%x...\n", apicid); |
cb3c8b90 GOC |
541 | |
542 | for (i = 0; i < ARRAY_SIZE(regs); i++) { | |
823b259b | 543 | printk(KERN_INFO "... APIC 0x%x %s: ", apicid, names[i]); |
cb3c8b90 GOC |
544 | |
545 | /* | |
546 | * Wait for idle. | |
547 | */ | |
548 | status = safe_apic_wait_icr_idle(); | |
549 | if (status) | |
550 | printk(KERN_CONT | |
551 | "a previous APIC delivery may have failed\n"); | |
552 | ||
1b374e4d | 553 | apic_icr_write(APIC_DM_REMRD | regs[i], apicid); |
cb3c8b90 GOC |
554 | |
555 | timeout = 0; | |
556 | do { | |
557 | udelay(100); | |
558 | status = apic_read(APIC_ICR) & APIC_ICR_RR_MASK; | |
559 | } while (status == APIC_ICR_RR_INPROG && timeout++ < 1000); | |
560 | ||
561 | switch (status) { | |
562 | case APIC_ICR_RR_VALID: | |
563 | status = apic_read(APIC_RRR); | |
564 | printk(KERN_CONT "%08x\n", status); | |
565 | break; | |
566 | default: | |
567 | printk(KERN_CONT "failed\n"); | |
568 | } | |
569 | } | |
570 | } | |
571 | ||
572 | #ifdef WAKE_SECONDARY_VIA_NMI | |
573 | /* | |
574 | * Poke the other CPU in the eye via NMI to wake it up. Remember that the normal | |
575 | * INIT, INIT, STARTUP sequence will reset the chip hard for us, and this | |
576 | * won't ... remember to clear down the APIC, etc later. | |
577 | */ | |
578 | static int __devinit | |
579 | wakeup_secondary_cpu(int logical_apicid, unsigned long start_eip) | |
580 | { | |
581 | unsigned long send_status, accept_status = 0; | |
582 | int maxlvt; | |
583 | ||
584 | /* Target chip */ | |
cb3c8b90 GOC |
585 | /* Boot on the stack */ |
586 | /* Kick the second */ | |
1b374e4d | 587 | apic_icr_write(APIC_DM_NMI | APIC_DEST_LOGICAL, logical_apicid); |
cb3c8b90 | 588 | |
cfc1b9a6 | 589 | pr_debug("Waiting for send to finish...\n"); |
cb3c8b90 GOC |
590 | send_status = safe_apic_wait_icr_idle(); |
591 | ||
592 | /* | |
593 | * Give the other CPU some time to accept the IPI. | |
594 | */ | |
595 | udelay(200); | |
59ef48a5 CG |
596 | if (APIC_INTEGRATED(apic_version[phys_apicid])) { |
597 | maxlvt = lapic_get_maxlvt(); | |
598 | if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */ | |
599 | apic_write(APIC_ESR, 0); | |
600 | accept_status = (apic_read(APIC_ESR) & 0xEF); | |
601 | } | |
cfc1b9a6 | 602 | pr_debug("NMI sent.\n"); |
cb3c8b90 GOC |
603 | |
604 | if (send_status) | |
605 | printk(KERN_ERR "APIC never delivered???\n"); | |
606 | if (accept_status) | |
607 | printk(KERN_ERR "APIC delivery error (%lx).\n", accept_status); | |
608 | ||
609 | return (send_status | accept_status); | |
610 | } | |
611 | #endif /* WAKE_SECONDARY_VIA_NMI */ | |
612 | ||
cb3c8b90 GOC |
613 | #ifdef WAKE_SECONDARY_VIA_INIT |
614 | static int __devinit | |
615 | wakeup_secondary_cpu(int phys_apicid, unsigned long start_eip) | |
616 | { | |
617 | unsigned long send_status, accept_status = 0; | |
618 | int maxlvt, num_starts, j; | |
619 | ||
34d05591 JS |
620 | if (get_uv_system_type() == UV_NON_UNIQUE_APIC) { |
621 | send_status = uv_wakeup_secondary(phys_apicid, start_eip); | |
622 | atomic_set(&init_deasserted, 1); | |
623 | return send_status; | |
624 | } | |
625 | ||
593f4a78 MR |
626 | maxlvt = lapic_get_maxlvt(); |
627 | ||
cb3c8b90 GOC |
628 | /* |
629 | * Be paranoid about clearing APIC errors. | |
630 | */ | |
631 | if (APIC_INTEGRATED(apic_version[phys_apicid])) { | |
593f4a78 MR |
632 | if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */ |
633 | apic_write(APIC_ESR, 0); | |
cb3c8b90 GOC |
634 | apic_read(APIC_ESR); |
635 | } | |
636 | ||
cfc1b9a6 | 637 | pr_debug("Asserting INIT.\n"); |
cb3c8b90 GOC |
638 | |
639 | /* | |
640 | * Turn INIT on target chip | |
641 | */ | |
cb3c8b90 GOC |
642 | /* |
643 | * Send IPI | |
644 | */ | |
1b374e4d SS |
645 | apic_icr_write(APIC_INT_LEVELTRIG | APIC_INT_ASSERT | APIC_DM_INIT, |
646 | phys_apicid); | |
cb3c8b90 | 647 | |
cfc1b9a6 | 648 | pr_debug("Waiting for send to finish...\n"); |
cb3c8b90 GOC |
649 | send_status = safe_apic_wait_icr_idle(); |
650 | ||
651 | mdelay(10); | |
652 | ||
cfc1b9a6 | 653 | pr_debug("Deasserting INIT.\n"); |
cb3c8b90 GOC |
654 | |
655 | /* Target chip */ | |
cb3c8b90 | 656 | /* Send IPI */ |
1b374e4d | 657 | apic_icr_write(APIC_INT_LEVELTRIG | APIC_DM_INIT, phys_apicid); |
cb3c8b90 | 658 | |
cfc1b9a6 | 659 | pr_debug("Waiting for send to finish...\n"); |
cb3c8b90 GOC |
660 | send_status = safe_apic_wait_icr_idle(); |
661 | ||
662 | mb(); | |
663 | atomic_set(&init_deasserted, 1); | |
664 | ||
665 | /* | |
666 | * Should we send STARTUP IPIs ? | |
667 | * | |
668 | * Determine this based on the APIC version. | |
669 | * If we don't have an integrated APIC, don't send the STARTUP IPIs. | |
670 | */ | |
671 | if (APIC_INTEGRATED(apic_version[phys_apicid])) | |
672 | num_starts = 2; | |
673 | else | |
674 | num_starts = 0; | |
675 | ||
676 | /* | |
677 | * Paravirt / VMI wants a startup IPI hook here to set up the | |
678 | * target processor state. | |
679 | */ | |
680 | startup_ipi_hook(phys_apicid, (unsigned long) start_secondary, | |
cb3c8b90 | 681 | (unsigned long)stack_start.sp); |
cb3c8b90 GOC |
682 | |
683 | /* | |
684 | * Run STARTUP IPI loop. | |
685 | */ | |
cfc1b9a6 | 686 | pr_debug("#startup loops: %d.\n", num_starts); |
cb3c8b90 | 687 | |
cb3c8b90 | 688 | for (j = 1; j <= num_starts; j++) { |
cfc1b9a6 | 689 | pr_debug("Sending STARTUP #%d.\n", j); |
593f4a78 MR |
690 | if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */ |
691 | apic_write(APIC_ESR, 0); | |
cb3c8b90 | 692 | apic_read(APIC_ESR); |
cfc1b9a6 | 693 | pr_debug("After apic_write.\n"); |
cb3c8b90 GOC |
694 | |
695 | /* | |
696 | * STARTUP IPI | |
697 | */ | |
698 | ||
699 | /* Target chip */ | |
cb3c8b90 GOC |
700 | /* Boot on the stack */ |
701 | /* Kick the second */ | |
1b374e4d SS |
702 | apic_icr_write(APIC_DM_STARTUP | (start_eip >> 12), |
703 | phys_apicid); | |
cb3c8b90 GOC |
704 | |
705 | /* | |
706 | * Give the other CPU some time to accept the IPI. | |
707 | */ | |
708 | udelay(300); | |
709 | ||
cfc1b9a6 | 710 | pr_debug("Startup point 1.\n"); |
cb3c8b90 | 711 | |
cfc1b9a6 | 712 | pr_debug("Waiting for send to finish...\n"); |
cb3c8b90 GOC |
713 | send_status = safe_apic_wait_icr_idle(); |
714 | ||
715 | /* | |
716 | * Give the other CPU some time to accept the IPI. | |
717 | */ | |
718 | udelay(200); | |
593f4a78 | 719 | if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */ |
cb3c8b90 | 720 | apic_write(APIC_ESR, 0); |
cb3c8b90 GOC |
721 | accept_status = (apic_read(APIC_ESR) & 0xEF); |
722 | if (send_status || accept_status) | |
723 | break; | |
724 | } | |
cfc1b9a6 | 725 | pr_debug("After Startup.\n"); |
cb3c8b90 GOC |
726 | |
727 | if (send_status) | |
728 | printk(KERN_ERR "APIC never delivered???\n"); | |
729 | if (accept_status) | |
730 | printk(KERN_ERR "APIC delivery error (%lx).\n", accept_status); | |
731 | ||
732 | return (send_status | accept_status); | |
733 | } | |
734 | #endif /* WAKE_SECONDARY_VIA_INIT */ | |
735 | ||
736 | struct create_idle { | |
737 | struct work_struct work; | |
738 | struct task_struct *idle; | |
739 | struct completion done; | |
740 | int cpu; | |
741 | }; | |
742 | ||
743 | static void __cpuinit do_fork_idle(struct work_struct *work) | |
744 | { | |
745 | struct create_idle *c_idle = | |
746 | container_of(work, struct create_idle, work); | |
747 | ||
748 | c_idle->idle = fork_idle(c_idle->cpu); | |
749 | complete(&c_idle->done); | |
750 | } | |
751 | ||
f307d25e | 752 | #ifdef CONFIG_X86_64 |
d19fbfdf MS |
753 | |
754 | /* __ref because it's safe to call free_bootmem when after_bootmem == 0. */ | |
755 | static void __ref free_bootmem_pda(struct x8664_pda *oldpda) | |
756 | { | |
757 | if (!after_bootmem) | |
758 | free_bootmem((unsigned long)oldpda, sizeof(*oldpda)); | |
759 | } | |
760 | ||
3461b0af MT |
761 | /* |
762 | * Allocate node local memory for the AP pda. | |
763 | * | |
764 | * Must be called after the _cpu_pda pointer table is initialized. | |
765 | */ | |
7c33b1e6 | 766 | int __cpuinit get_local_pda(int cpu) |
3461b0af MT |
767 | { |
768 | struct x8664_pda *oldpda, *newpda; | |
769 | unsigned long size = sizeof(struct x8664_pda); | |
770 | int node = cpu_to_node(cpu); | |
771 | ||
772 | if (cpu_pda(cpu) && !cpu_pda(cpu)->in_bootmem) | |
773 | return 0; | |
774 | ||
775 | oldpda = cpu_pda(cpu); | |
776 | newpda = kmalloc_node(size, GFP_ATOMIC, node); | |
777 | if (!newpda) { | |
778 | printk(KERN_ERR "Could not allocate node local PDA " | |
779 | "for CPU %d on node %d\n", cpu, node); | |
780 | ||
781 | if (oldpda) | |
782 | return 0; /* have a usable pda */ | |
783 | else | |
784 | return -1; | |
785 | } | |
786 | ||
787 | if (oldpda) { | |
788 | memcpy(newpda, oldpda, size); | |
d19fbfdf | 789 | free_bootmem_pda(oldpda); |
3461b0af MT |
790 | } |
791 | ||
792 | newpda->in_bootmem = 0; | |
793 | cpu_pda(cpu) = newpda; | |
794 | return 0; | |
795 | } | |
f307d25e | 796 | #endif /* CONFIG_X86_64 */ |
3461b0af | 797 | |
cb3c8b90 GOC |
798 | static int __cpuinit do_boot_cpu(int apicid, int cpu) |
799 | /* | |
800 | * NOTE - on most systems this is a PHYSICAL apic ID, but on multiquad | |
801 | * (ie clustered apic addressing mode), this is a LOGICAL apic ID. | |
802 | * Returns zero if CPU booted OK, else error code from wakeup_secondary_cpu. | |
803 | */ | |
804 | { | |
805 | unsigned long boot_error = 0; | |
806 | int timeout; | |
807 | unsigned long start_ip; | |
808 | unsigned short nmi_high = 0, nmi_low = 0; | |
809 | struct create_idle c_idle = { | |
810 | .cpu = cpu, | |
811 | .done = COMPLETION_INITIALIZER_ONSTACK(c_idle.done), | |
812 | }; | |
813 | INIT_WORK(&c_idle.work, do_fork_idle); | |
cb3c8b90 | 814 | |
a939098a | 815 | #ifdef CONFIG_X86_64 |
cb3c8b90 | 816 | /* Allocate node local memory for AP pdas */ |
3461b0af MT |
817 | if (cpu > 0) { |
818 | boot_error = get_local_pda(cpu); | |
819 | if (boot_error) | |
820 | goto restore_state; | |
821 | /* if can't get pda memory, can't start cpu */ | |
cb3c8b90 GOC |
822 | } |
823 | #endif | |
824 | ||
825 | alternatives_smp_switch(1); | |
826 | ||
827 | c_idle.idle = get_idle_for_cpu(cpu); | |
828 | ||
829 | /* | |
830 | * We can't use kernel_thread since we must avoid to | |
831 | * reschedule the child. | |
832 | */ | |
833 | if (c_idle.idle) { | |
834 | c_idle.idle->thread.sp = (unsigned long) (((struct pt_regs *) | |
835 | (THREAD_SIZE + task_stack_page(c_idle.idle))) - 1); | |
836 | init_idle(c_idle.idle, cpu); | |
837 | goto do_rest; | |
838 | } | |
839 | ||
840 | if (!keventd_up() || current_is_keventd()) | |
841 | c_idle.work.func(&c_idle.work); | |
842 | else { | |
843 | schedule_work(&c_idle.work); | |
844 | wait_for_completion(&c_idle.done); | |
845 | } | |
846 | ||
847 | if (IS_ERR(c_idle.idle)) { | |
848 | printk("failed fork for CPU %d\n", cpu); | |
849 | return PTR_ERR(c_idle.idle); | |
850 | } | |
851 | ||
852 | set_idle_for_cpu(cpu, c_idle.idle); | |
853 | do_rest: | |
854 | #ifdef CONFIG_X86_32 | |
855 | per_cpu(current_task, cpu) = c_idle.idle; | |
856 | init_gdt(cpu); | |
cb3c8b90 | 857 | /* Stack for startup_32 can be just as for start_secondary onwards */ |
cb3c8b90 GOC |
858 | irq_ctx_init(cpu); |
859 | #else | |
860 | cpu_pda(cpu)->pcurrent = c_idle.idle; | |
cb3c8b90 GOC |
861 | clear_tsk_thread_flag(c_idle.idle, TIF_FORK); |
862 | #endif | |
a939098a | 863 | early_gdt_descr.address = (unsigned long)get_cpu_gdt_table(cpu); |
3e970473 | 864 | initial_code = (unsigned long)start_secondary; |
9cf4f298 | 865 | stack_start.sp = (void *) c_idle.idle->thread.sp; |
cb3c8b90 GOC |
866 | |
867 | /* start_ip had better be page-aligned! */ | |
868 | start_ip = setup_trampoline(); | |
869 | ||
870 | /* So we see what's up */ | |
823b259b | 871 | printk(KERN_INFO "Booting processor %d APIC 0x%x ip 0x%lx\n", |
cb3c8b90 GOC |
872 | cpu, apicid, start_ip); |
873 | ||
874 | /* | |
875 | * This grunge runs the startup process for | |
876 | * the targeted processor. | |
877 | */ | |
878 | ||
879 | atomic_set(&init_deasserted, 0); | |
880 | ||
34d05591 | 881 | if (get_uv_system_type() != UV_NON_UNIQUE_APIC) { |
cb3c8b90 | 882 | |
cfc1b9a6 | 883 | pr_debug("Setting warm reset code and vector.\n"); |
cb3c8b90 | 884 | |
34d05591 JS |
885 | store_NMI_vector(&nmi_high, &nmi_low); |
886 | ||
887 | smpboot_setup_warm_reset_vector(start_ip); | |
888 | /* | |
889 | * Be paranoid about clearing APIC errors. | |
db96b0a0 CG |
890 | */ |
891 | if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) { | |
892 | apic_write(APIC_ESR, 0); | |
893 | apic_read(APIC_ESR); | |
894 | } | |
34d05591 | 895 | } |
cb3c8b90 | 896 | |
cb3c8b90 GOC |
897 | /* |
898 | * Starting actual IPI sequence... | |
899 | */ | |
900 | boot_error = wakeup_secondary_cpu(apicid, start_ip); | |
901 | ||
902 | if (!boot_error) { | |
903 | /* | |
904 | * allow APs to start initializing. | |
905 | */ | |
cfc1b9a6 | 906 | pr_debug("Before Callout %d.\n", cpu); |
cb3c8b90 | 907 | cpu_set(cpu, cpu_callout_map); |
cfc1b9a6 | 908 | pr_debug("After Callout %d.\n", cpu); |
cb3c8b90 GOC |
909 | |
910 | /* | |
911 | * Wait 5s total for a response | |
912 | */ | |
913 | for (timeout = 0; timeout < 50000; timeout++) { | |
914 | if (cpu_isset(cpu, cpu_callin_map)) | |
915 | break; /* It has booted */ | |
916 | udelay(100); | |
917 | } | |
918 | ||
919 | if (cpu_isset(cpu, cpu_callin_map)) { | |
920 | /* number CPUs logically, starting from 1 (BSP is 0) */ | |
cfc1b9a6 | 921 | pr_debug("OK.\n"); |
cb3c8b90 GOC |
922 | printk(KERN_INFO "CPU%d: ", cpu); |
923 | print_cpu_info(&cpu_data(cpu)); | |
cfc1b9a6 | 924 | pr_debug("CPU has booted.\n"); |
cb3c8b90 GOC |
925 | } else { |
926 | boot_error = 1; | |
927 | if (*((volatile unsigned char *)trampoline_base) | |
928 | == 0xA5) | |
929 | /* trampoline started but...? */ | |
930 | printk(KERN_ERR "Stuck ??\n"); | |
931 | else | |
932 | /* trampoline code not run */ | |
933 | printk(KERN_ERR "Not responding.\n"); | |
34d05591 JS |
934 | if (get_uv_system_type() != UV_NON_UNIQUE_APIC) |
935 | inquire_remote_apic(apicid); | |
cb3c8b90 GOC |
936 | } |
937 | } | |
6f585e01 | 938 | #ifdef CONFIG_X86_64 |
3461b0af | 939 | restore_state: |
6f585e01 | 940 | #endif |
cb3c8b90 GOC |
941 | if (boot_error) { |
942 | /* Try to put things back the way they were before ... */ | |
23ca4bba | 943 | numa_remove_cpu(cpu); /* was set by numa_add_cpu */ |
cb3c8b90 GOC |
944 | cpu_clear(cpu, cpu_callout_map); /* was set by do_boot_cpu() */ |
945 | cpu_clear(cpu, cpu_initialized); /* was set by cpu_init() */ | |
cb3c8b90 GOC |
946 | cpu_clear(cpu, cpu_present_map); |
947 | per_cpu(x86_cpu_to_apicid, cpu) = BAD_APICID; | |
948 | } | |
949 | ||
950 | /* mark "stuck" area as not stuck */ | |
951 | *((volatile unsigned long *)trampoline_base) = 0; | |
952 | ||
63d38198 AK |
953 | /* |
954 | * Cleanup possible dangling ends... | |
955 | */ | |
956 | smpboot_restore_warm_reset_vector(); | |
957 | ||
cb3c8b90 GOC |
958 | return boot_error; |
959 | } | |
960 | ||
961 | int __cpuinit native_cpu_up(unsigned int cpu) | |
962 | { | |
963 | int apicid = cpu_present_to_apicid(cpu); | |
964 | unsigned long flags; | |
965 | int err; | |
966 | ||
967 | WARN_ON(irqs_disabled()); | |
968 | ||
cfc1b9a6 | 969 | pr_debug("++++++++++++++++++++=_---CPU UP %u\n", cpu); |
cb3c8b90 GOC |
970 | |
971 | if (apicid == BAD_APICID || apicid == boot_cpu_physical_apicid || | |
972 | !physid_isset(apicid, phys_cpu_present_map)) { | |
973 | printk(KERN_ERR "%s: bad cpu %d\n", __func__, cpu); | |
974 | return -EINVAL; | |
975 | } | |
976 | ||
977 | /* | |
978 | * Already booted CPU? | |
979 | */ | |
980 | if (cpu_isset(cpu, cpu_callin_map)) { | |
cfc1b9a6 | 981 | pr_debug("do_boot_cpu %d Already started\n", cpu); |
cb3c8b90 GOC |
982 | return -ENOSYS; |
983 | } | |
984 | ||
985 | /* | |
986 | * Save current MTRR state in case it was changed since early boot | |
987 | * (e.g. by the ACPI SMI) to initialize new CPUs with MTRRs in sync: | |
988 | */ | |
989 | mtrr_save_state(); | |
990 | ||
991 | per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; | |
992 | ||
993 | #ifdef CONFIG_X86_32 | |
994 | /* init low mem mapping */ | |
68db065c | 995 | clone_pgd_range(swapper_pg_dir, swapper_pg_dir + KERNEL_PGD_BOUNDARY, |
61165d7a | 996 | min_t(unsigned long, KERNEL_PGD_PTRS, KERNEL_PGD_BOUNDARY)); |
cb3c8b90 | 997 | flush_tlb_all(); |
61165d7a | 998 | low_mappings = 1; |
cb3c8b90 GOC |
999 | |
1000 | err = do_boot_cpu(apicid, cpu); | |
61165d7a HD |
1001 | |
1002 | zap_low_mappings(); | |
1003 | low_mappings = 0; | |
1004 | #else | |
1005 | err = do_boot_cpu(apicid, cpu); | |
1006 | #endif | |
1007 | if (err) { | |
cfc1b9a6 | 1008 | pr_debug("do_boot_cpu failed %d\n", err); |
61165d7a | 1009 | return -EIO; |
cb3c8b90 GOC |
1010 | } |
1011 | ||
1012 | /* | |
1013 | * Check TSC synchronization with the AP (keep irqs disabled | |
1014 | * while doing so): | |
1015 | */ | |
1016 | local_irq_save(flags); | |
1017 | check_tsc_sync_source(cpu); | |
1018 | local_irq_restore(flags); | |
1019 | ||
7c04e64a | 1020 | while (!cpu_online(cpu)) { |
cb3c8b90 GOC |
1021 | cpu_relax(); |
1022 | touch_nmi_watchdog(); | |
1023 | } | |
1024 | ||
1025 | return 0; | |
1026 | } | |
1027 | ||
8aef135c GOC |
1028 | /* |
1029 | * Fall back to non SMP mode after errors. | |
1030 | * | |
1031 | * RED-PEN audit/test this more. I bet there is more state messed up here. | |
1032 | */ | |
1033 | static __init void disable_smp(void) | |
1034 | { | |
1035 | cpu_present_map = cpumask_of_cpu(0); | |
1036 | cpu_possible_map = cpumask_of_cpu(0); | |
8aef135c | 1037 | smpboot_clear_io_apic_irqs(); |
0f385d1d | 1038 | |
8aef135c | 1039 | if (smp_found_config) |
b6df1b8b | 1040 | physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map); |
8aef135c | 1041 | else |
b6df1b8b | 1042 | physid_set_mask_of_physid(0, &phys_cpu_present_map); |
8aef135c GOC |
1043 | map_cpu_to_logical_apicid(); |
1044 | cpu_set(0, per_cpu(cpu_sibling_map, 0)); | |
1045 | cpu_set(0, per_cpu(cpu_core_map, 0)); | |
1046 | } | |
1047 | ||
1048 | /* | |
1049 | * Various sanity checks. | |
1050 | */ | |
1051 | static int __init smp_sanity_check(unsigned max_cpus) | |
1052 | { | |
ac23d4ee | 1053 | preempt_disable(); |
a58f03b0 YL |
1054 | |
1055 | #if defined(CONFIG_X86_PC) && defined(CONFIG_X86_32) | |
1056 | if (def_to_bigsmp && nr_cpu_ids > 8) { | |
1057 | unsigned int cpu; | |
1058 | unsigned nr; | |
1059 | ||
1060 | printk(KERN_WARNING | |
1061 | "More than 8 CPUs detected - skipping them.\n" | |
1062 | "Use CONFIG_X86_GENERICARCH and CONFIG_X86_BIGSMP.\n"); | |
1063 | ||
1064 | nr = 0; | |
1065 | for_each_present_cpu(cpu) { | |
1066 | if (nr >= 8) | |
1067 | cpu_clear(cpu, cpu_present_map); | |
1068 | nr++; | |
1069 | } | |
1070 | ||
1071 | nr = 0; | |
1072 | for_each_possible_cpu(cpu) { | |
1073 | if (nr >= 8) | |
1074 | cpu_clear(cpu, cpu_possible_map); | |
1075 | nr++; | |
1076 | } | |
1077 | ||
1078 | nr_cpu_ids = 8; | |
1079 | } | |
1080 | #endif | |
1081 | ||
8aef135c GOC |
1082 | if (!physid_isset(hard_smp_processor_id(), phys_cpu_present_map)) { |
1083 | printk(KERN_WARNING "weird, boot CPU (#%d) not listed" | |
1084 | "by the BIOS.\n", hard_smp_processor_id()); | |
1085 | physid_set(hard_smp_processor_id(), phys_cpu_present_map); | |
1086 | } | |
1087 | ||
1088 | /* | |
1089 | * If we couldn't find an SMP configuration at boot time, | |
1090 | * get out of here now! | |
1091 | */ | |
1092 | if (!smp_found_config && !acpi_lapic) { | |
ac23d4ee | 1093 | preempt_enable(); |
8aef135c GOC |
1094 | printk(KERN_NOTICE "SMP motherboard not detected.\n"); |
1095 | disable_smp(); | |
1096 | if (APIC_init_uniprocessor()) | |
1097 | printk(KERN_NOTICE "Local APIC not detected." | |
1098 | " Using dummy APIC emulation.\n"); | |
1099 | return -1; | |
1100 | } | |
1101 | ||
1102 | /* | |
1103 | * Should not be necessary because the MP table should list the boot | |
1104 | * CPU too, but we do it for the sake of robustness anyway. | |
1105 | */ | |
1106 | if (!check_phys_apicid_present(boot_cpu_physical_apicid)) { | |
1107 | printk(KERN_NOTICE | |
1108 | "weird, boot CPU (#%d) not listed by the BIOS.\n", | |
1109 | boot_cpu_physical_apicid); | |
1110 | physid_set(hard_smp_processor_id(), phys_cpu_present_map); | |
1111 | } | |
ac23d4ee | 1112 | preempt_enable(); |
8aef135c GOC |
1113 | |
1114 | /* | |
1115 | * If we couldn't find a local APIC, then get out of here now! | |
1116 | */ | |
1117 | if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid]) && | |
1118 | !cpu_has_apic) { | |
1119 | printk(KERN_ERR "BIOS bug, local APIC #%d not detected!...\n", | |
1120 | boot_cpu_physical_apicid); | |
1121 | printk(KERN_ERR "... forcing use of dummy APIC emulation." | |
1122 | "(tell your hw vendor)\n"); | |
1123 | smpboot_clear_io_apic(); | |
1124 | return -1; | |
1125 | } | |
1126 | ||
1127 | verify_local_APIC(); | |
1128 | ||
1129 | /* | |
1130 | * If SMP should be disabled, then really disable it! | |
1131 | */ | |
1132 | if (!max_cpus) { | |
73d08e63 | 1133 | printk(KERN_INFO "SMP mode deactivated.\n"); |
8aef135c | 1134 | smpboot_clear_io_apic(); |
d54db1ac MR |
1135 | |
1136 | localise_nmi_watchdog(); | |
1137 | ||
e90955c2 | 1138 | connect_bsp_APIC(); |
e90955c2 JB |
1139 | setup_local_APIC(); |
1140 | end_local_APIC_setup(); | |
8aef135c GOC |
1141 | return -1; |
1142 | } | |
1143 | ||
1144 | return 0; | |
1145 | } | |
1146 | ||
1147 | static void __init smp_cpu_index_default(void) | |
1148 | { | |
1149 | int i; | |
1150 | struct cpuinfo_x86 *c; | |
1151 | ||
7c04e64a | 1152 | for_each_possible_cpu(i) { |
8aef135c GOC |
1153 | c = &cpu_data(i); |
1154 | /* mark all to hotplug */ | |
1155 | c->cpu_index = NR_CPUS; | |
1156 | } | |
1157 | } | |
1158 | ||
1159 | /* | |
1160 | * Prepare for SMP bootup. The MP table or ACPI has been read | |
1161 | * earlier. Just do some sanity checking here and enable APIC mode. | |
1162 | */ | |
1163 | void __init native_smp_prepare_cpus(unsigned int max_cpus) | |
1164 | { | |
deef3250 | 1165 | preempt_disable(); |
8aef135c GOC |
1166 | smp_cpu_index_default(); |
1167 | current_cpu_data = boot_cpu_data; | |
1168 | cpu_callin_map = cpumask_of_cpu(0); | |
1169 | mb(); | |
1170 | /* | |
1171 | * Setup boot CPU information | |
1172 | */ | |
1173 | smp_store_cpu_info(0); /* Final full version of the data */ | |
1b374e4d | 1174 | #ifdef CONFIG_X86_32 |
8aef135c | 1175 | boot_cpu_logical_apicid = logical_smp_processor_id(); |
1b374e4d | 1176 | #endif |
8aef135c GOC |
1177 | current_thread_info()->cpu = 0; /* needed? */ |
1178 | set_cpu_sibling_map(0); | |
1179 | ||
6e1cb38a SS |
1180 | #ifdef CONFIG_X86_64 |
1181 | enable_IR_x2apic(); | |
1182 | setup_apic_routing(); | |
1183 | #endif | |
1184 | ||
8aef135c GOC |
1185 | if (smp_sanity_check(max_cpus) < 0) { |
1186 | printk(KERN_INFO "SMP disabled\n"); | |
1187 | disable_smp(); | |
deef3250 | 1188 | goto out; |
8aef135c GOC |
1189 | } |
1190 | ||
ac23d4ee | 1191 | preempt_disable(); |
4c9961d5 | 1192 | if (read_apic_id() != boot_cpu_physical_apicid) { |
8aef135c | 1193 | panic("Boot APIC ID in local APIC unexpected (%d vs %d)", |
4c9961d5 | 1194 | read_apic_id(), boot_cpu_physical_apicid); |
8aef135c GOC |
1195 | /* Or can we switch back to PIC here? */ |
1196 | } | |
ac23d4ee | 1197 | preempt_enable(); |
8aef135c | 1198 | |
8aef135c | 1199 | connect_bsp_APIC(); |
b5841765 | 1200 | |
8aef135c GOC |
1201 | /* |
1202 | * Switch from PIC to APIC mode. | |
1203 | */ | |
1204 | setup_local_APIC(); | |
1205 | ||
1206 | #ifdef CONFIG_X86_64 | |
1207 | /* | |
1208 | * Enable IO APIC before setting up error vector | |
1209 | */ | |
1210 | if (!skip_ioapic_setup && nr_ioapics) | |
1211 | enable_IO_APIC(); | |
1212 | #endif | |
1213 | end_local_APIC_setup(); | |
1214 | ||
1215 | map_cpu_to_logical_apicid(); | |
1216 | ||
1217 | setup_portio_remap(); | |
1218 | ||
1219 | smpboot_setup_io_apic(); | |
1220 | /* | |
1221 | * Set up local APIC timer on boot CPU. | |
1222 | */ | |
1223 | ||
1224 | printk(KERN_INFO "CPU%d: ", 0); | |
1225 | print_cpu_info(&cpu_data(0)); | |
1226 | setup_boot_clock(); | |
c4bd1fda MS |
1227 | |
1228 | if (is_uv_system()) | |
1229 | uv_system_init(); | |
deef3250 IM |
1230 | out: |
1231 | preempt_enable(); | |
8aef135c | 1232 | } |
a8db8453 GOC |
1233 | /* |
1234 | * Early setup to make printk work. | |
1235 | */ | |
1236 | void __init native_smp_prepare_boot_cpu(void) | |
1237 | { | |
1238 | int me = smp_processor_id(); | |
1239 | #ifdef CONFIG_X86_32 | |
1240 | init_gdt(me); | |
a8db8453 | 1241 | #endif |
a939098a | 1242 | switch_to_new_gdt(); |
a8db8453 GOC |
1243 | /* already set me in cpu_online_map in boot_cpu_init() */ |
1244 | cpu_set(me, cpu_callout_map); | |
1245 | per_cpu(cpu_state, me) = CPU_ONLINE; | |
1246 | } | |
1247 | ||
83f7eb9c GOC |
1248 | void __init native_smp_cpus_done(unsigned int max_cpus) |
1249 | { | |
cfc1b9a6 | 1250 | pr_debug("Boot done.\n"); |
83f7eb9c GOC |
1251 | |
1252 | impress_friends(); | |
1253 | smp_checks(); | |
1254 | #ifdef CONFIG_X86_IO_APIC | |
1255 | setup_ioapic_dest(); | |
1256 | #endif | |
1257 | check_nmi_watchdog(); | |
83f7eb9c GOC |
1258 | } |
1259 | ||
68a1c3f8 GC |
1260 | /* |
1261 | * cpu_possible_map should be static, it cannot change as cpu's | |
1262 | * are onlined, or offlined. The reason is per-cpu data-structures | |
1263 | * are allocated by some modules at init time, and dont expect to | |
1264 | * do this dynamically on cpu arrival/departure. | |
1265 | * cpu_present_map on the other hand can change dynamically. | |
1266 | * In case when cpu_hotplug is not compiled, then we resort to current | |
1267 | * behaviour, which is cpu_possible == cpu_present. | |
1268 | * - Ashok Raj | |
1269 | * | |
1270 | * Three ways to find out the number of additional hotplug CPUs: | |
1271 | * - If the BIOS specified disabled CPUs in ACPI/mptables use that. | |
1272 | * - The user can overwrite it with additional_cpus=NUM | |
1273 | * - Otherwise don't reserve additional CPUs. | |
1274 | * We do this because additional CPUs waste a lot of memory. | |
1275 | * -AK | |
1276 | */ | |
1277 | __init void prefill_possible_map(void) | |
1278 | { | |
cb48bb59 | 1279 | int i, possible; |
68a1c3f8 | 1280 | |
329513a3 YL |
1281 | /* no processor from mptable or madt */ |
1282 | if (!num_processors) | |
1283 | num_processors = 1; | |
1284 | ||
cb48bb59 | 1285 | possible = num_processors + disabled_cpus; |
68a1c3f8 GC |
1286 | if (possible > NR_CPUS) |
1287 | possible = NR_CPUS; | |
1288 | ||
1289 | printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n", | |
1290 | possible, max_t(int, possible - num_processors, 0)); | |
1291 | ||
1292 | for (i = 0; i < possible; i++) | |
1293 | cpu_set(i, cpu_possible_map); | |
3461b0af MT |
1294 | |
1295 | nr_cpu_ids = possible; | |
68a1c3f8 | 1296 | } |
69c18c15 | 1297 | |
14adf855 CE |
1298 | #ifdef CONFIG_HOTPLUG_CPU |
1299 | ||
1300 | static void remove_siblinginfo(int cpu) | |
1301 | { | |
1302 | int sibling; | |
1303 | struct cpuinfo_x86 *c = &cpu_data(cpu); | |
1304 | ||
1305 | for_each_cpu_mask_nr(sibling, per_cpu(cpu_core_map, cpu)) { | |
1306 | cpu_clear(cpu, per_cpu(cpu_core_map, sibling)); | |
1307 | /*/ | |
1308 | * last thread sibling in this cpu core going down | |
1309 | */ | |
1310 | if (cpus_weight(per_cpu(cpu_sibling_map, cpu)) == 1) | |
1311 | cpu_data(sibling).booted_cores--; | |
1312 | } | |
1313 | ||
1314 | for_each_cpu_mask_nr(sibling, per_cpu(cpu_sibling_map, cpu)) | |
1315 | cpu_clear(cpu, per_cpu(cpu_sibling_map, sibling)); | |
1316 | cpus_clear(per_cpu(cpu_sibling_map, cpu)); | |
1317 | cpus_clear(per_cpu(cpu_core_map, cpu)); | |
1318 | c->phys_proc_id = 0; | |
1319 | c->cpu_core_id = 0; | |
1320 | cpu_clear(cpu, cpu_sibling_setup_map); | |
1321 | } | |
1322 | ||
69c18c15 GC |
1323 | static void __ref remove_cpu_from_maps(int cpu) |
1324 | { | |
1325 | cpu_clear(cpu, cpu_online_map); | |
69c18c15 GC |
1326 | cpu_clear(cpu, cpu_callout_map); |
1327 | cpu_clear(cpu, cpu_callin_map); | |
1328 | /* was set by cpu_init() */ | |
29cbeb0e | 1329 | cpu_clear(cpu, cpu_initialized); |
23ca4bba | 1330 | numa_remove_cpu(cpu); |
69c18c15 GC |
1331 | } |
1332 | ||
8227dce7 | 1333 | void cpu_disable_common(void) |
69c18c15 GC |
1334 | { |
1335 | int cpu = smp_processor_id(); | |
69c18c15 GC |
1336 | /* |
1337 | * HACK: | |
1338 | * Allow any queued timer interrupts to get serviced | |
1339 | * This is only a temporary solution until we cleanup | |
1340 | * fixup_irqs as we do for IA64. | |
1341 | */ | |
1342 | local_irq_enable(); | |
1343 | mdelay(1); | |
1344 | ||
1345 | local_irq_disable(); | |
1346 | remove_siblinginfo(cpu); | |
1347 | ||
1348 | /* It's now safe to remove this processor from the online map */ | |
d388e5fd | 1349 | lock_vector_lock(); |
69c18c15 | 1350 | remove_cpu_from_maps(cpu); |
d388e5fd | 1351 | unlock_vector_lock(); |
69c18c15 | 1352 | fixup_irqs(cpu_online_map); |
8227dce7 AN |
1353 | } |
1354 | ||
1355 | int native_cpu_disable(void) | |
1356 | { | |
1357 | int cpu = smp_processor_id(); | |
1358 | ||
1359 | /* | |
1360 | * Perhaps use cpufreq to drop frequency, but that could go | |
1361 | * into generic code. | |
1362 | * | |
1363 | * We won't take down the boot processor on i386 due to some | |
1364 | * interrupts only being able to be serviced by the BSP. | |
1365 | * Especially so if we're not using an IOAPIC -zwane | |
1366 | */ | |
1367 | if (cpu == 0) | |
1368 | return -EBUSY; | |
1369 | ||
1370 | if (nmi_watchdog == NMI_LOCAL_APIC) | |
1371 | stop_apic_nmi_watchdog(NULL); | |
1372 | clear_local_APIC(); | |
1373 | ||
1374 | cpu_disable_common(); | |
69c18c15 GC |
1375 | return 0; |
1376 | } | |
1377 | ||
93be71b6 | 1378 | void native_cpu_die(unsigned int cpu) |
69c18c15 GC |
1379 | { |
1380 | /* We don't do anything here: idle task is faking death itself. */ | |
1381 | unsigned int i; | |
1382 | ||
1383 | for (i = 0; i < 10; i++) { | |
1384 | /* They ack this in play_dead by setting CPU_DEAD */ | |
1385 | if (per_cpu(cpu_state, cpu) == CPU_DEAD) { | |
1386 | printk(KERN_INFO "CPU %d is now offline\n", cpu); | |
1387 | if (1 == num_online_cpus()) | |
1388 | alternatives_smp_switch(0); | |
1389 | return; | |
1390 | } | |
1391 | msleep(100); | |
1392 | } | |
1393 | printk(KERN_ERR "CPU %u didn't die...\n", cpu); | |
1394 | } | |
a21f5d88 AN |
1395 | |
1396 | void play_dead_common(void) | |
1397 | { | |
1398 | idle_task_exit(); | |
1399 | reset_lazy_tlbstate(); | |
1400 | irq_ctx_exit(raw_smp_processor_id()); | |
07bbc16a | 1401 | c1e_remove_cpu(raw_smp_processor_id()); |
a21f5d88 AN |
1402 | |
1403 | mb(); | |
1404 | /* Ack it */ | |
1405 | __get_cpu_var(cpu_state) = CPU_DEAD; | |
1406 | ||
1407 | /* | |
1408 | * With physical CPU hotplug, we should halt the cpu | |
1409 | */ | |
1410 | local_irq_disable(); | |
1411 | } | |
1412 | ||
1413 | void native_play_dead(void) | |
1414 | { | |
1415 | play_dead_common(); | |
1416 | wbinvd_halt(); | |
1417 | } | |
1418 | ||
69c18c15 | 1419 | #else /* ... !CONFIG_HOTPLUG_CPU */ |
93be71b6 | 1420 | int native_cpu_disable(void) |
69c18c15 GC |
1421 | { |
1422 | return -ENOSYS; | |
1423 | } | |
1424 | ||
93be71b6 | 1425 | void native_cpu_die(unsigned int cpu) |
69c18c15 GC |
1426 | { |
1427 | /* We said "no" in __cpu_disable */ | |
1428 | BUG(); | |
1429 | } | |
a21f5d88 AN |
1430 | |
1431 | void native_play_dead(void) | |
1432 | { | |
1433 | BUG(); | |
1434 | } | |
1435 | ||
68a1c3f8 | 1436 | #endif |