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/smp.h>
26 #include <linux/spinlock.h>
27 #include <linux/threads.h>
28 #include <linux/module.h>
29 #include <linux/time.h>
30 #include <linux/timex.h>
31 #include <linux/sched.h>
32 #include <linux/cpumask.h>
33 #include <linux/cpu.h>
34 #include <linux/err.h>
35 #include <linux/ftrace.h>
36 #include <linux/irqdomain.h>
38 #include <linux/of_irq.h>
40 #include <linux/atomic.h>
42 #include <asm/processor.h>
44 #include <asm/r4k-timer.h>
45 #include <asm/mips-cpc.h>
46 #include <asm/mmu_context.h>
48 #include <asm/setup.h>
51 cpumask_t cpu_callin_map
; /* Bitmask of started secondaries */
53 int __cpu_number_map
[NR_CPUS
]; /* Map physical to logical */
54 EXPORT_SYMBOL(__cpu_number_map
);
56 int __cpu_logical_map
[NR_CPUS
]; /* Map logical to physical */
57 EXPORT_SYMBOL(__cpu_logical_map
);
59 /* Number of TCs (or siblings in Intel speak) per CPU core */
60 int smp_num_siblings
= 1;
61 EXPORT_SYMBOL(smp_num_siblings
);
63 /* representing the TCs (or siblings in Intel speak) of each logical CPU */
64 cpumask_t cpu_sibling_map
[NR_CPUS
] __read_mostly
;
65 EXPORT_SYMBOL(cpu_sibling_map
);
67 /* representing the core map of multi-core chips of each logical CPU */
68 cpumask_t cpu_core_map
[NR_CPUS
] __read_mostly
;
69 EXPORT_SYMBOL(cpu_core_map
);
72 * A logcal cpu mask containing only one VPE per core to
73 * reduce the number of IPIs on large MT systems.
75 cpumask_t cpu_foreign_map __read_mostly
;
76 EXPORT_SYMBOL(cpu_foreign_map
);
78 /* representing cpus for which sibling maps can be computed */
79 static cpumask_t cpu_sibling_setup_map
;
81 /* representing cpus for which core maps can be computed */
82 static cpumask_t cpu_core_setup_map
;
84 cpumask_t cpu_coherent_mask
;
86 #ifdef CONFIG_GENERIC_IRQ_IPI
87 static struct irq_desc
*call_desc
;
88 static struct irq_desc
*sched_desc
;
91 static inline void set_cpu_sibling_map(int cpu
)
95 cpumask_set_cpu(cpu
, &cpu_sibling_setup_map
);
97 if (smp_num_siblings
> 1) {
98 for_each_cpu(i
, &cpu_sibling_setup_map
) {
99 if (cpu_data
[cpu
].package
== cpu_data
[i
].package
&&
100 cpu_data
[cpu
].core
== cpu_data
[i
].core
) {
101 cpumask_set_cpu(i
, &cpu_sibling_map
[cpu
]);
102 cpumask_set_cpu(cpu
, &cpu_sibling_map
[i
]);
106 cpumask_set_cpu(cpu
, &cpu_sibling_map
[cpu
]);
109 static inline void set_cpu_core_map(int cpu
)
113 cpumask_set_cpu(cpu
, &cpu_core_setup_map
);
115 for_each_cpu(i
, &cpu_core_setup_map
) {
116 if (cpu_data
[cpu
].package
== cpu_data
[i
].package
) {
117 cpumask_set_cpu(i
, &cpu_core_map
[cpu
]);
118 cpumask_set_cpu(cpu
, &cpu_core_map
[i
]);
124 * Calculate a new cpu_foreign_map mask whenever a
125 * new cpu appears or disappears.
127 static inline void calculate_cpu_foreign_map(void)
129 int i
, k
, core_present
;
130 cpumask_t temp_foreign_map
;
132 /* Re-calculate the mask */
133 cpumask_clear(&temp_foreign_map
);
134 for_each_online_cpu(i
) {
136 for_each_cpu(k
, &temp_foreign_map
)
137 if (cpu_data
[i
].package
== cpu_data
[k
].package
&&
138 cpu_data
[i
].core
== cpu_data
[k
].core
)
141 cpumask_set_cpu(i
, &temp_foreign_map
);
144 cpumask_copy(&cpu_foreign_map
, &temp_foreign_map
);
147 struct plat_smp_ops
*mp_ops
;
148 EXPORT_SYMBOL(mp_ops
);
150 void register_smp_ops(struct plat_smp_ops
*ops
)
153 printk(KERN_WARNING
"Overriding previously set SMP ops\n");
158 #ifdef CONFIG_GENERIC_IRQ_IPI
159 void mips_smp_send_ipi_single(int cpu
, unsigned int action
)
161 mips_smp_send_ipi_mask(cpumask_of(cpu
), action
);
164 void mips_smp_send_ipi_mask(const struct cpumask
*mask
, unsigned int action
)
170 local_irq_save(flags
);
173 case SMP_CALL_FUNCTION
:
174 __ipi_send_mask(call_desc
, mask
);
177 case SMP_RESCHEDULE_YOURSELF
:
178 __ipi_send_mask(sched_desc
, mask
);
185 if (mips_cpc_present()) {
186 for_each_cpu(cpu
, mask
) {
187 core
= cpu_data
[cpu
].core
;
189 if (core
== current_cpu_data
.core
)
192 while (!cpumask_test_cpu(cpu
, &cpu_coherent_mask
)) {
193 mips_cpc_lock_other(core
);
194 write_cpc_co_cmd(CPC_Cx_CMD_PWRUP
);
195 mips_cpc_unlock_other();
200 local_irq_restore(flags
);
204 static irqreturn_t
ipi_resched_interrupt(int irq
, void *dev_id
)
211 static irqreturn_t
ipi_call_interrupt(int irq
, void *dev_id
)
213 generic_smp_call_function_interrupt();
218 static struct irqaction irq_resched
= {
219 .handler
= ipi_resched_interrupt
,
220 .flags
= IRQF_PERCPU
,
221 .name
= "IPI resched"
224 static struct irqaction irq_call
= {
225 .handler
= ipi_call_interrupt
,
226 .flags
= IRQF_PERCPU
,
230 static __init
void smp_ipi_init_one(unsigned int virq
,
231 struct irqaction
*action
)
235 irq_set_handler(virq
, handle_percpu_irq
);
236 ret
= setup_irq(virq
, action
);
240 static int __init
mips_smp_ipi_init(void)
242 unsigned int call_virq
, sched_virq
;
243 struct irq_domain
*ipidomain
;
244 struct device_node
*node
;
246 node
= of_irq_find_parent(of_root
);
247 ipidomain
= irq_find_matching_host(node
, DOMAIN_BUS_IPI
);
250 * Some platforms have half DT setup. So if we found irq node but
251 * didn't find an ipidomain, try to search for one that is not in the
254 if (node
&& !ipidomain
)
255 ipidomain
= irq_find_matching_host(NULL
, DOMAIN_BUS_IPI
);
258 * There are systems which only use IPI domains some of the time,
259 * depending upon configuration we don't know until runtime. An
260 * example is Malta where we may compile in support for GIC & the
261 * MT ASE, but run on a system which has multiple VPEs in a single
262 * core and doesn't include a GIC. Until all IPI implementations
263 * have been converted to use IPI domains the best we can do here
264 * is to return & hope some other code sets up the IPIs.
269 call_virq
= irq_reserve_ipi(ipidomain
, cpu_possible_mask
);
272 sched_virq
= irq_reserve_ipi(ipidomain
, cpu_possible_mask
);
275 if (irq_domain_is_ipi_per_cpu(ipidomain
)) {
278 for_each_cpu(cpu
, cpu_possible_mask
) {
279 smp_ipi_init_one(call_virq
+ cpu
, &irq_call
);
280 smp_ipi_init_one(sched_virq
+ cpu
, &irq_resched
);
283 smp_ipi_init_one(call_virq
, &irq_call
);
284 smp_ipi_init_one(sched_virq
, &irq_resched
);
287 call_desc
= irq_to_desc(call_virq
);
288 sched_desc
= irq_to_desc(sched_virq
);
292 early_initcall(mips_smp_ipi_init
);
296 * First C code run on the secondary CPUs after being started up by
299 asmlinkage
void start_secondary(void)
304 per_cpu_trap_init(false);
305 mips_clockevent_init();
306 mp_ops
->init_secondary();
311 * XXX parity protection should be folded in here when it's converted
312 * to an option instead of something based on .cputype
317 cpu
= smp_processor_id();
318 cpu_data
[cpu
].udelay_val
= loops_per_jiffy
;
320 cpumask_set_cpu(cpu
, &cpu_coherent_mask
);
321 notify_cpu_starting(cpu
);
323 set_cpu_online(cpu
, true);
325 set_cpu_sibling_map(cpu
);
326 set_cpu_core_map(cpu
);
328 calculate_cpu_foreign_map();
330 cpumask_set_cpu(cpu
, &cpu_callin_map
);
332 synchronise_count_slave(cpu
);
335 * irq will be enabled in ->smp_finish(), enabling it too early
338 WARN_ON_ONCE(!irqs_disabled());
339 mp_ops
->smp_finish();
341 cpu_startup_entry(CPUHP_AP_ONLINE_IDLE
);
344 static void stop_this_cpu(void *dummy
)
347 * Remove this CPU. Be a bit slow here and
348 * set the bits for every online CPU so we don't miss
349 * any IPI whilst taking this VPE down.
352 cpumask_copy(&cpu_foreign_map
, cpu_online_mask
);
354 /* Make it visible to every other CPU */
357 set_cpu_online(smp_processor_id(), false);
358 calculate_cpu_foreign_map();
363 void smp_send_stop(void)
365 smp_call_function(stop_this_cpu
, NULL
, 0);
368 void __init
smp_cpus_done(unsigned int max_cpus
)
372 /* called from main before smp_init() */
373 void __init
smp_prepare_cpus(unsigned int max_cpus
)
375 init_new_context(current
, &init_mm
);
376 current_thread_info()->cpu
= 0;
377 mp_ops
->prepare_cpus(max_cpus
);
378 set_cpu_sibling_map(0);
380 calculate_cpu_foreign_map();
381 #ifndef CONFIG_HOTPLUG_CPU
382 init_cpu_present(cpu_possible_mask
);
384 cpumask_copy(&cpu_coherent_mask
, cpu_possible_mask
);
387 /* preload SMP state for boot cpu */
388 void smp_prepare_boot_cpu(void)
390 set_cpu_possible(0, true);
391 set_cpu_online(0, true);
392 cpumask_set_cpu(0, &cpu_callin_map
);
395 int __cpu_up(unsigned int cpu
, struct task_struct
*tidle
)
397 mp_ops
->boot_secondary(cpu
, tidle
);
400 * Trust is futile. We should really have timeouts ...
402 while (!cpumask_test_cpu(cpu
, &cpu_callin_map
)) {
407 synchronise_count_master(cpu
);
411 /* Not really SMP stuff ... */
412 int setup_profiling_timer(unsigned int multiplier
)
417 static void flush_tlb_all_ipi(void *info
)
419 local_flush_tlb_all();
422 void flush_tlb_all(void)
424 on_each_cpu(flush_tlb_all_ipi
, NULL
, 1);
427 static void flush_tlb_mm_ipi(void *mm
)
429 local_flush_tlb_mm((struct mm_struct
*)mm
);
433 * Special Variant of smp_call_function for use by TLB functions:
436 * o collapses to normal function call on UP kernels
437 * o collapses to normal function call on systems with a single shared
440 static inline void smp_on_other_tlbs(void (*func
) (void *info
), void *info
)
442 smp_call_function(func
, info
, 1);
445 static inline void smp_on_each_tlb(void (*func
) (void *info
), void *info
)
449 smp_on_other_tlbs(func
, info
);
456 * The following tlb flush calls are invoked when old translations are
457 * being torn down, or pte attributes are changing. For single threaded
458 * address spaces, a new context is obtained on the current cpu, and tlb
459 * context on other cpus are invalidated to force a new context allocation
460 * at switch_mm time, should the mm ever be used on other cpus. For
461 * multithreaded address spaces, intercpu interrupts have to be sent.
462 * Another case where intercpu interrupts are required is when the target
463 * mm might be active on another cpu (eg debuggers doing the flushes on
464 * behalf of debugees, kswapd stealing pages from another process etc).
468 void flush_tlb_mm(struct mm_struct
*mm
)
472 if ((atomic_read(&mm
->mm_users
) != 1) || (current
->mm
!= mm
)) {
473 smp_on_other_tlbs(flush_tlb_mm_ipi
, mm
);
477 for_each_online_cpu(cpu
) {
478 if (cpu
!= smp_processor_id() && cpu_context(cpu
, mm
))
479 cpu_context(cpu
, mm
) = 0;
482 local_flush_tlb_mm(mm
);
487 struct flush_tlb_data
{
488 struct vm_area_struct
*vma
;
493 static void flush_tlb_range_ipi(void *info
)
495 struct flush_tlb_data
*fd
= info
;
497 local_flush_tlb_range(fd
->vma
, fd
->addr1
, fd
->addr2
);
500 void flush_tlb_range(struct vm_area_struct
*vma
, unsigned long start
, unsigned long end
)
502 struct mm_struct
*mm
= vma
->vm_mm
;
505 if ((atomic_read(&mm
->mm_users
) != 1) || (current
->mm
!= mm
)) {
506 struct flush_tlb_data fd
= {
512 smp_on_other_tlbs(flush_tlb_range_ipi
, &fd
);
516 for_each_online_cpu(cpu
) {
517 if (cpu
!= smp_processor_id() && cpu_context(cpu
, mm
))
518 cpu_context(cpu
, mm
) = 0;
521 local_flush_tlb_range(vma
, start
, end
);
525 static void flush_tlb_kernel_range_ipi(void *info
)
527 struct flush_tlb_data
*fd
= info
;
529 local_flush_tlb_kernel_range(fd
->addr1
, fd
->addr2
);
532 void flush_tlb_kernel_range(unsigned long start
, unsigned long end
)
534 struct flush_tlb_data fd
= {
539 on_each_cpu(flush_tlb_kernel_range_ipi
, &fd
, 1);
542 static void flush_tlb_page_ipi(void *info
)
544 struct flush_tlb_data
*fd
= info
;
546 local_flush_tlb_page(fd
->vma
, fd
->addr1
);
549 void flush_tlb_page(struct vm_area_struct
*vma
, unsigned long page
)
552 if ((atomic_read(&vma
->vm_mm
->mm_users
) != 1) || (current
->mm
!= vma
->vm_mm
)) {
553 struct flush_tlb_data fd
= {
558 smp_on_other_tlbs(flush_tlb_page_ipi
, &fd
);
562 for_each_online_cpu(cpu
) {
563 if (cpu
!= smp_processor_id() && cpu_context(cpu
, vma
->vm_mm
))
564 cpu_context(cpu
, vma
->vm_mm
) = 0;
567 local_flush_tlb_page(vma
, page
);
571 static void flush_tlb_one_ipi(void *info
)
573 unsigned long vaddr
= (unsigned long) info
;
575 local_flush_tlb_one(vaddr
);
578 void flush_tlb_one(unsigned long vaddr
)
580 smp_on_each_tlb(flush_tlb_one_ipi
, (void *) vaddr
);
583 EXPORT_SYMBOL(flush_tlb_page
);
584 EXPORT_SYMBOL(flush_tlb_one
);
586 #if defined(CONFIG_KEXEC)
587 void (*dump_ipi_function_ptr
)(void *) = NULL
;
588 void dump_send_ipi(void (*dump_ipi_callback
)(void *))
591 int cpu
= smp_processor_id();
593 dump_ipi_function_ptr
= dump_ipi_callback
;
595 for_each_online_cpu(i
)
597 mp_ops
->send_ipi_single(i
, SMP_DUMP
);
600 EXPORT_SYMBOL(dump_send_ipi
);
603 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
605 static DEFINE_PER_CPU(atomic_t
, tick_broadcast_count
);
606 static DEFINE_PER_CPU(struct call_single_data
, tick_broadcast_csd
);
608 void tick_broadcast(const struct cpumask
*mask
)
611 struct call_single_data
*csd
;
614 for_each_cpu(cpu
, mask
) {
615 count
= &per_cpu(tick_broadcast_count
, cpu
);
616 csd
= &per_cpu(tick_broadcast_csd
, cpu
);
618 if (atomic_inc_return(count
) == 1)
619 smp_call_function_single_async(cpu
, csd
);
623 static void tick_broadcast_callee(void *info
)
625 int cpu
= smp_processor_id();
626 tick_receive_broadcast();
627 atomic_set(&per_cpu(tick_broadcast_count
, cpu
), 0);
630 static int __init
tick_broadcast_init(void)
632 struct call_single_data
*csd
;
635 for (cpu
= 0; cpu
< NR_CPUS
; cpu
++) {
636 csd
= &per_cpu(tick_broadcast_csd
, cpu
);
637 csd
->func
= tick_broadcast_callee
;
642 early_initcall(tick_broadcast_init
);
644 #endif /* CONFIG_GENERIC_CLOCKEVENTS_BROADCAST */