2 * This program is free software; you can redistribute it and/or
3 * modify it under the terms of the GNU General Public License
4 * as published by the Free Software Foundation; either version 2
5 * of the License, or (at your option) any later version.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
16 * Copyright (C) 2000, 2001 Kanoj Sarcar
17 * Copyright (C) 2000, 2001 Ralf Baechle
18 * Copyright (C) 2000, 2001 Silicon Graphics, Inc.
19 * Copyright (C) 2000, 2001, 2003 Broadcom Corporation
21 #include <linux/cache.h>
22 #include <linux/delay.h>
23 #include <linux/init.h>
24 #include <linux/interrupt.h>
25 #include <linux/spinlock.h>
26 #include <linux/threads.h>
27 #include <linux/module.h>
28 #include <linux/time.h>
29 #include <linux/timex.h>
30 #include <linux/sched.h>
31 #include <linux/cpumask.h>
32 #include <linux/cpu.h>
33 #include <linux/err.h>
35 #include <asm/atomic.h>
37 #include <asm/processor.h>
38 #include <asm/system.h>
39 #include <asm/mmu_context.h>
42 #ifdef CONFIG_MIPS_MT_SMTC
43 #include <asm/mipsmtregs.h>
44 #endif /* CONFIG_MIPS_MT_SMTC */
46 cpumask_t phys_cpu_present_map
; /* Bitmask of available CPUs */
47 volatile cpumask_t cpu_callin_map
; /* Bitmask of started secondaries */
48 cpumask_t cpu_online_map
; /* Bitmask of currently online CPUs */
49 int __cpu_number_map
[NR_CPUS
]; /* Map physical to logical */
50 int __cpu_logical_map
[NR_CPUS
]; /* Map logical to physical */
52 EXPORT_SYMBOL(phys_cpu_present_map
);
53 EXPORT_SYMBOL(cpu_online_map
);
55 extern void __init
calibrate_delay(void);
56 extern void cpu_idle(void);
59 * First C code run on the secondary CPUs after being started up by
62 asmlinkage __cpuinit
void start_secondary(void)
66 #ifdef CONFIG_MIPS_MT_SMTC
67 /* Only do cpu_probe for first TC of CPU */
68 if ((read_c0_tcbind() & TCBIND_CURTC
) == 0)
69 #endif /* CONFIG_MIPS_MT_SMTC */
73 prom_init_secondary();
76 * XXX parity protection should be folded in here when it's converted
77 * to an option instead of something based on .cputype
82 cpu
= smp_processor_id();
83 cpu_data
[cpu
].udelay_val
= loops_per_jiffy
;
87 cpu_set(cpu
, cpu_callin_map
);
92 DEFINE_SPINLOCK(smp_call_lock
);
94 struct call_data_struct
*call_data
;
97 * Run a function on all other CPUs.
98 * <func> The function to run. This must be fast and non-blocking.
99 * <info> An arbitrary pointer to pass to the function.
100 * <retry> If true, keep retrying until ready.
101 * <wait> If true, wait until function has completed on other CPUs.
102 * [RETURNS] 0 on success, else a negative status code.
104 * Does not return until remote CPUs are nearly ready to execute <func>
105 * or are or have executed.
107 * You must not call this function with disabled interrupts or from a
108 * hardware interrupt handler or from a bottom half handler:
112 * smp_call_function()
115 * Wait for all cpus to acknowledge IPI
116 * CPU A has not responded, spin waiting
117 * for cpu A to respond, holding call_lock
118 * smp_call_function()
119 * Spin waiting for call_lock
122 int smp_call_function (void (*func
) (void *info
), void *info
, int retry
,
125 struct call_data_struct data
;
126 int i
, cpus
= num_online_cpus() - 1;
127 int cpu
= smp_processor_id();
130 * Can die spectacularly if this CPU isn't yet marked online
132 BUG_ON(!cpu_online(cpu
));
137 /* Can deadlock when called with interrupts disabled */
138 WARN_ON(irqs_disabled());
142 atomic_set(&data
.started
, 0);
145 atomic_set(&data
.finished
, 0);
147 spin_lock(&smp_call_lock
);
151 /* Send a message to all other CPUs and wait for them to respond */
152 for_each_online_cpu(i
)
154 core_send_ipi(i
, SMP_CALL_FUNCTION
);
156 /* Wait for response */
157 /* FIXME: lock-up detection, backtrace on lock-up */
158 while (atomic_read(&data
.started
) != cpus
)
162 while (atomic_read(&data
.finished
) != cpus
)
165 spin_unlock(&smp_call_lock
);
171 void smp_call_function_interrupt(void)
173 void (*func
) (void *info
) = call_data
->func
;
174 void *info
= call_data
->info
;
175 int wait
= call_data
->wait
;
178 * Notify initiating CPU that I've grabbed the data and am
179 * about to execute the function.
182 atomic_inc(&call_data
->started
);
185 * At this point the info structure may be out of scope unless wait==1.
193 atomic_inc(&call_data
->finished
);
197 int smp_call_function_single(int cpu
, void (*func
) (void *info
), void *info
,
200 struct call_data_struct data
;
204 * Can die spectacularly if this CPU isn't yet marked online
206 if (!cpu_online(cpu
))
210 BUG_ON(!cpu_online(me
));
220 /* Can deadlock when called with interrupts disabled */
221 WARN_ON(irqs_disabled());
225 atomic_set(&data
.started
, 0);
228 atomic_set(&data
.finished
, 0);
230 spin_lock(&smp_call_lock
);
234 /* Send a message to the other CPU */
235 core_send_ipi(cpu
, SMP_CALL_FUNCTION
);
237 /* Wait for response */
238 /* FIXME: lock-up detection, backtrace on lock-up */
239 while (atomic_read(&data
.started
) != 1)
243 while (atomic_read(&data
.finished
) != 1)
246 spin_unlock(&smp_call_lock
);
252 static void stop_this_cpu(void *dummy
)
257 cpu_clear(smp_processor_id(), cpu_online_map
);
258 local_irq_enable(); /* May need to service _machine_restart IPI */
259 for (;;); /* Wait if available. */
262 void smp_send_stop(void)
264 smp_call_function(stop_this_cpu
, NULL
, 1, 0);
267 void __init
smp_cpus_done(unsigned int max_cpus
)
272 /* called from main before smp_init() */
273 void __init
smp_prepare_cpus(unsigned int max_cpus
)
275 init_new_context(current
, &init_mm
);
276 current_thread_info()->cpu
= 0;
277 plat_prepare_cpus(max_cpus
);
278 #ifndef CONFIG_HOTPLUG_CPU
279 cpu_present_map
= cpu_possible_map
;
283 /* preload SMP state for boot cpu */
284 void __devinit
smp_prepare_boot_cpu(void)
287 * This assumes that bootup is always handled by the processor
288 * with the logic and physical number 0.
290 __cpu_number_map
[0] = 0;
291 __cpu_logical_map
[0] = 0;
292 cpu_set(0, phys_cpu_present_map
);
293 cpu_set(0, cpu_online_map
);
294 cpu_set(0, cpu_callin_map
);
298 * Called once for each "cpu_possible(cpu)". Needs to spin up the cpu
299 * and keep control until "cpu_online(cpu)" is set. Note: cpu is
300 * physical, not logical.
302 int __cpuinit
__cpu_up(unsigned int cpu
)
304 struct task_struct
*idle
;
307 * Processor goes to start_secondary(), sets online flag
308 * The following code is purely to make sure
309 * Linux can schedule processes on this slave.
311 idle
= fork_idle(cpu
);
313 panic(KERN_ERR
"Fork failed for CPU %d", cpu
);
315 prom_boot_secondary(cpu
, idle
);
318 * Trust is futile. We should really have timeouts ...
320 while (!cpu_isset(cpu
, cpu_callin_map
))
323 cpu_set(cpu
, cpu_online_map
);
328 /* Not really SMP stuff ... */
329 int setup_profiling_timer(unsigned int multiplier
)
334 static void flush_tlb_all_ipi(void *info
)
336 local_flush_tlb_all();
339 void flush_tlb_all(void)
341 on_each_cpu(flush_tlb_all_ipi
, NULL
, 1, 1);
344 static void flush_tlb_mm_ipi(void *mm
)
346 local_flush_tlb_mm((struct mm_struct
*)mm
);
350 * Special Variant of smp_call_function for use by TLB functions:
353 * o collapses to normal function call on UP kernels
354 * o collapses to normal function call on systems with a single shared
356 * o CONFIG_MIPS_MT_SMTC currently implies there is only one physical core.
358 static inline void smp_on_other_tlbs(void (*func
) (void *info
), void *info
)
360 #ifndef CONFIG_MIPS_MT_SMTC
361 smp_call_function(func
, info
, 1, 1);
365 static inline void smp_on_each_tlb(void (*func
) (void *info
), void *info
)
369 smp_on_other_tlbs(func
, info
);
376 * The following tlb flush calls are invoked when old translations are
377 * being torn down, or pte attributes are changing. For single threaded
378 * address spaces, a new context is obtained on the current cpu, and tlb
379 * context on other cpus are invalidated to force a new context allocation
380 * at switch_mm time, should the mm ever be used on other cpus. For
381 * multithreaded address spaces, intercpu interrupts have to be sent.
382 * Another case where intercpu interrupts are required is when the target
383 * mm might be active on another cpu (eg debuggers doing the flushes on
384 * behalf of debugees, kswapd stealing pages from another process etc).
388 void flush_tlb_mm(struct mm_struct
*mm
)
392 if ((atomic_read(&mm
->mm_users
) != 1) || (current
->mm
!= mm
)) {
393 smp_on_other_tlbs(flush_tlb_mm_ipi
, (void *)mm
);
396 for (i
= 0; i
< num_online_cpus(); i
++)
397 if (smp_processor_id() != i
)
398 cpu_context(i
, mm
) = 0;
400 local_flush_tlb_mm(mm
);
405 struct flush_tlb_data
{
406 struct vm_area_struct
*vma
;
411 static void flush_tlb_range_ipi(void *info
)
413 struct flush_tlb_data
*fd
= (struct flush_tlb_data
*)info
;
415 local_flush_tlb_range(fd
->vma
, fd
->addr1
, fd
->addr2
);
418 void flush_tlb_range(struct vm_area_struct
*vma
, unsigned long start
, unsigned long end
)
420 struct mm_struct
*mm
= vma
->vm_mm
;
423 if ((atomic_read(&mm
->mm_users
) != 1) || (current
->mm
!= mm
)) {
424 struct flush_tlb_data fd
;
429 smp_on_other_tlbs(flush_tlb_range_ipi
, (void *)&fd
);
432 for (i
= 0; i
< num_online_cpus(); i
++)
433 if (smp_processor_id() != i
)
434 cpu_context(i
, mm
) = 0;
436 local_flush_tlb_range(vma
, start
, end
);
440 static void flush_tlb_kernel_range_ipi(void *info
)
442 struct flush_tlb_data
*fd
= (struct flush_tlb_data
*)info
;
444 local_flush_tlb_kernel_range(fd
->addr1
, fd
->addr2
);
447 void flush_tlb_kernel_range(unsigned long start
, unsigned long end
)
449 struct flush_tlb_data fd
;
453 on_each_cpu(flush_tlb_kernel_range_ipi
, (void *)&fd
, 1, 1);
456 static void flush_tlb_page_ipi(void *info
)
458 struct flush_tlb_data
*fd
= (struct flush_tlb_data
*)info
;
460 local_flush_tlb_page(fd
->vma
, fd
->addr1
);
463 void flush_tlb_page(struct vm_area_struct
*vma
, unsigned long page
)
466 if ((atomic_read(&vma
->vm_mm
->mm_users
) != 1) || (current
->mm
!= vma
->vm_mm
)) {
467 struct flush_tlb_data fd
;
471 smp_on_other_tlbs(flush_tlb_page_ipi
, (void *)&fd
);
474 for (i
= 0; i
< num_online_cpus(); i
++)
475 if (smp_processor_id() != i
)
476 cpu_context(i
, vma
->vm_mm
) = 0;
478 local_flush_tlb_page(vma
, page
);
482 static void flush_tlb_one_ipi(void *info
)
484 unsigned long vaddr
= (unsigned long) info
;
486 local_flush_tlb_one(vaddr
);
489 void flush_tlb_one(unsigned long vaddr
)
491 smp_on_each_tlb(flush_tlb_one_ipi
, (void *) vaddr
);
494 EXPORT_SYMBOL(flush_tlb_page
);
495 EXPORT_SYMBOL(flush_tlb_one
);