4 * Written by Cort Dougan (cort@cs.nmt.edu) borrowing a great
5 * deal of code from the sparc and intel versions.
7 * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
9 * PowerPC-64 Support added by Dave Engebretsen, Peter Bergner, and
10 * Mike Corrigan {engebret|bergner|mikec}@us.ibm.com
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/sched.h>
23 #include <linux/smp.h>
24 #include <linux/interrupt.h>
25 #include <linux/delay.h>
26 #include <linux/init.h>
27 #include <linux/spinlock.h>
28 #include <linux/cache.h>
29 #include <linux/err.h>
30 #include <linux/sysdev.h>
31 #include <linux/cpu.h>
32 #include <linux/notifier.h>
33 #include <linux/topology.h>
35 #include <asm/ptrace.h>
36 #include <asm/atomic.h>
39 #include <asm/pgtable.h>
43 #include <asm/machdep.h>
44 #include <asm/cputable.h>
45 #include <asm/system.h>
47 #include <asm/vdso_datapage.h>
54 #define DBG(fmt...) udbg_printf(fmt)
59 int smp_hw_index
[NR_CPUS
];
60 struct thread_info
*secondary_ti
;
62 cpumask_t cpu_possible_map
= CPU_MASK_NONE
;
63 cpumask_t cpu_online_map
= CPU_MASK_NONE
;
64 DEFINE_PER_CPU(cpumask_t
, cpu_sibling_map
) = CPU_MASK_NONE
;
66 EXPORT_SYMBOL(cpu_online_map
);
67 EXPORT_SYMBOL(cpu_possible_map
);
68 EXPORT_PER_CPU_SYMBOL(cpu_sibling_map
);
70 /* SMP operations for this machine */
71 struct smp_ops_t
*smp_ops
;
73 static volatile unsigned int cpu_callin_map
[NR_CPUS
];
75 int smt_enabled_at_boot
= 1;
77 static void (*crash_ipi_function_ptr
)(struct pt_regs
*) = NULL
;
80 void __devinit
smp_generic_kick_cpu(int nr
)
82 BUG_ON(nr
< 0 || nr
>= NR_CPUS
);
85 * The processor is currently spinning, waiting for the
86 * cpu_start field to become non-zero After we set cpu_start,
87 * the processor will continue on to secondary_start
89 paca
[nr
].cpu_start
= 1;
94 void smp_message_recv(int msg
)
97 case PPC_MSG_CALL_FUNCTION
:
98 generic_smp_call_function_interrupt();
100 case PPC_MSG_RESCHEDULE
:
101 /* XXX Do we have to do this? */
104 case PPC_MSG_CALL_FUNC_SINGLE
:
105 generic_smp_call_function_single_interrupt();
107 case PPC_MSG_DEBUGGER_BREAK
:
108 if (crash_ipi_function_ptr
) {
109 crash_ipi_function_ptr(get_irq_regs());
112 #ifdef CONFIG_DEBUGGER
113 debugger_ipi(get_irq_regs());
115 #endif /* CONFIG_DEBUGGER */
118 printk("SMP %d: smp_message_recv(): unknown msg %d\n",
119 smp_processor_id(), msg
);
124 void smp_send_reschedule(int cpu
)
127 smp_ops
->message_pass(cpu
, PPC_MSG_RESCHEDULE
);
130 void arch_send_call_function_single_ipi(int cpu
)
132 smp_ops
->message_pass(cpu
, PPC_MSG_CALL_FUNC_SINGLE
);
135 void arch_send_call_function_ipi(cpumask_t mask
)
139 for_each_cpu_mask(cpu
, mask
)
140 smp_ops
->message_pass(cpu
, PPC_MSG_CALL_FUNCTION
);
143 #ifdef CONFIG_DEBUGGER
144 void smp_send_debugger_break(int cpu
)
147 smp_ops
->message_pass(cpu
, PPC_MSG_DEBUGGER_BREAK
);
152 void crash_send_ipi(void (*crash_ipi_callback
)(struct pt_regs
*))
154 crash_ipi_function_ptr
= crash_ipi_callback
;
155 if (crash_ipi_callback
&& smp_ops
) {
157 smp_ops
->message_pass(MSG_ALL_BUT_SELF
, PPC_MSG_DEBUGGER_BREAK
);
162 static void stop_this_cpu(void *dummy
)
169 void smp_send_stop(void)
171 smp_call_function(stop_this_cpu
, NULL
, 0);
174 extern struct gettimeofday_struct do_gtod
;
176 struct thread_info
*current_set
[NR_CPUS
];
178 DECLARE_PER_CPU(unsigned int, pvr
);
180 static void __devinit
smp_store_cpu_info(int id
)
182 per_cpu(pvr
, id
) = mfspr(SPRN_PVR
);
185 static void __init
smp_create_idle(unsigned int cpu
)
187 struct task_struct
*p
;
189 /* create a process for the processor */
192 panic("failed fork for CPU %u: %li", cpu
, PTR_ERR(p
));
194 paca
[cpu
].__current
= p
;
195 paca
[cpu
].kstack
= (unsigned long) task_thread_info(p
)
196 + THREAD_SIZE
- STACK_FRAME_OVERHEAD
;
198 current_set
[cpu
] = task_thread_info(p
);
199 task_thread_info(p
)->cpu
= cpu
;
202 void __init
smp_prepare_cpus(unsigned int max_cpus
)
206 DBG("smp_prepare_cpus\n");
209 * setup_cpu may need to be called on the boot cpu. We havent
210 * spun any cpus up but lets be paranoid.
212 BUG_ON(boot_cpuid
!= smp_processor_id());
215 smp_store_cpu_info(boot_cpuid
);
216 cpu_callin_map
[boot_cpuid
] = 1;
219 max_cpus
= smp_ops
->probe();
223 smp_space_timers(max_cpus
);
225 for_each_possible_cpu(cpu
)
226 if (cpu
!= boot_cpuid
)
227 smp_create_idle(cpu
);
230 void __devinit
smp_prepare_boot_cpu(void)
232 BUG_ON(smp_processor_id() != boot_cpuid
);
234 cpu_set(boot_cpuid
, cpu_online_map
);
236 paca
[boot_cpuid
].__current
= current
;
238 current_set
[boot_cpuid
] = task_thread_info(current
);
241 #ifdef CONFIG_HOTPLUG_CPU
242 /* State of each CPU during hotplug phases */
243 DEFINE_PER_CPU(int, cpu_state
) = { 0 };
245 int generic_cpu_disable(void)
247 unsigned int cpu
= smp_processor_id();
249 if (cpu
== boot_cpuid
)
252 cpu_clear(cpu
, cpu_online_map
);
254 vdso_data
->processorCount
--;
255 fixup_irqs(cpu_online_map
);
260 int generic_cpu_enable(unsigned int cpu
)
262 /* Do the normal bootup if we haven't
263 * already bootstrapped. */
264 if (system_state
!= SYSTEM_RUNNING
)
267 /* get the target out of it's holding state */
268 per_cpu(cpu_state
, cpu
) = CPU_UP_PREPARE
;
271 while (!cpu_online(cpu
))
275 fixup_irqs(cpu_online_map
);
276 /* counter the irq disable in fixup_irqs */
282 void generic_cpu_die(unsigned int cpu
)
286 for (i
= 0; i
< 100; i
++) {
288 if (per_cpu(cpu_state
, cpu
) == CPU_DEAD
)
292 printk(KERN_ERR
"CPU%d didn't die...\n", cpu
);
295 void generic_mach_cpu_die(void)
300 cpu
= smp_processor_id();
301 printk(KERN_DEBUG
"CPU%d offline\n", cpu
);
302 __get_cpu_var(cpu_state
) = CPU_DEAD
;
304 while (__get_cpu_var(cpu_state
) != CPU_UP_PREPARE
)
306 cpu_set(cpu
, cpu_online_map
);
311 static int __devinit
cpu_enable(unsigned int cpu
)
313 if (smp_ops
&& smp_ops
->cpu_enable
)
314 return smp_ops
->cpu_enable(cpu
);
319 int __cpuinit
__cpu_up(unsigned int cpu
)
323 secondary_ti
= current_set
[cpu
];
324 if (!cpu_enable(cpu
))
327 if (smp_ops
== NULL
||
328 (smp_ops
->cpu_bootable
&& !smp_ops
->cpu_bootable(cpu
)))
331 /* Make sure callin-map entry is 0 (can be leftover a CPU
334 cpu_callin_map
[cpu
] = 0;
336 /* The information for processor bringup must
337 * be written out to main store before we release
343 DBG("smp: kicking cpu %d\n", cpu
);
344 smp_ops
->kick_cpu(cpu
);
347 * wait to see if the cpu made a callin (is actually up).
348 * use this value that I found through experimentation.
351 if (system_state
< SYSTEM_RUNNING
)
352 for (c
= 50000; c
&& !cpu_callin_map
[cpu
]; c
--)
354 #ifdef CONFIG_HOTPLUG_CPU
357 * CPUs can take much longer to come up in the
358 * hotplug case. Wait five seconds.
360 for (c
= 25; c
&& !cpu_callin_map
[cpu
]; c
--) {
365 if (!cpu_callin_map
[cpu
]) {
366 printk("Processor %u is stuck.\n", cpu
);
370 printk("Processor %u found.\n", cpu
);
372 if (smp_ops
->give_timebase
)
373 smp_ops
->give_timebase();
375 /* Wait until cpu puts itself in the online map */
376 while (!cpu_online(cpu
))
383 /* Activate a secondary processor. */
384 int __devinit
start_secondary(void *unused
)
386 unsigned int cpu
= smp_processor_id();
388 atomic_inc(&init_mm
.mm_count
);
389 current
->active_mm
= &init_mm
;
391 smp_store_cpu_info(cpu
);
392 set_dec(tb_ticks_per_jiffy
);
394 cpu_callin_map
[cpu
] = 1;
396 smp_ops
->setup_cpu(cpu
);
397 if (smp_ops
->take_timebase
)
398 smp_ops
->take_timebase();
400 if (system_state
> SYSTEM_BOOTING
)
403 secondary_cpu_time_init();
406 cpu_set(cpu
, cpu_online_map
);
415 int setup_profiling_timer(unsigned int multiplier
)
420 void __init
smp_cpus_done(unsigned int max_cpus
)
424 /* We want the setup_cpu() here to be called from CPU 0, but our
425 * init thread may have been "borrowed" by another CPU in the meantime
426 * se we pin us down to CPU 0 for a short while
428 old_mask
= current
->cpus_allowed
;
429 set_cpus_allowed(current
, cpumask_of_cpu(boot_cpuid
));
432 smp_ops
->setup_cpu(boot_cpuid
);
434 set_cpus_allowed(current
, old_mask
);
436 snapshot_timebases();
438 dump_numa_cpu_topology();
441 #ifdef CONFIG_HOTPLUG_CPU
442 int __cpu_disable(void)
444 if (smp_ops
->cpu_disable
)
445 return smp_ops
->cpu_disable();
450 void __cpu_die(unsigned int cpu
)
452 if (smp_ops
->cpu_die
)
453 smp_ops
->cpu_die(cpu
);