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>
37 #include <linux/atomic.h>
39 #include <asm/processor.h>
41 #include <asm/r4k-timer.h>
42 #include <asm/mmu_context.h>
44 #include <asm/setup.h>
47 cpumask_t cpu_callin_map; /* Bitmask of started secondaries */
49 int __cpu_number_map[NR_CPUS]; /* Map physical to logical */
50 EXPORT_SYMBOL(__cpu_number_map);
52 int __cpu_logical_map[NR_CPUS]; /* Map logical to physical */
53 EXPORT_SYMBOL(__cpu_logical_map);
55 /* Number of TCs (or siblings in Intel speak) per CPU core */
56 int smp_num_siblings = 1;
57 EXPORT_SYMBOL(smp_num_siblings);
59 /* representing the TCs (or siblings in Intel speak) of each logical CPU */
60 cpumask_t cpu_sibling_map[NR_CPUS] __read_mostly;
61 EXPORT_SYMBOL(cpu_sibling_map);
63 /* representing the core map of multi-core chips of each logical CPU */
64 cpumask_t cpu_core_map[NR_CPUS] __read_mostly;
65 EXPORT_SYMBOL(cpu_core_map);
68 * A logcal cpu mask containing only one VPE per core to
69 * reduce the number of IPIs on large MT systems.
71 cpumask_t cpu_foreign_map __read_mostly;
72 EXPORT_SYMBOL(cpu_foreign_map);
74 /* representing cpus for which sibling maps can be computed */
75 static cpumask_t cpu_sibling_setup_map;
77 /* representing cpus for which core maps can be computed */
78 static cpumask_t cpu_core_setup_map;
80 cpumask_t cpu_coherent_mask;
82 static inline void set_cpu_sibling_map(int cpu)
86 cpumask_set_cpu(cpu, &cpu_sibling_setup_map);
88 if (smp_num_siblings > 1) {
89 for_each_cpu(i, &cpu_sibling_setup_map) {
90 if (cpu_data[cpu].package == cpu_data[i].package &&
91 cpu_data[cpu].core == cpu_data[i].core) {
92 cpumask_set_cpu(i, &cpu_sibling_map[cpu]);
93 cpumask_set_cpu(cpu, &cpu_sibling_map[i]);
97 cpumask_set_cpu(cpu, &cpu_sibling_map[cpu]);
100 static inline void set_cpu_core_map(int cpu)
104 cpumask_set_cpu(cpu, &cpu_core_setup_map);
106 for_each_cpu(i, &cpu_core_setup_map) {
107 if (cpu_data[cpu].package == cpu_data[i].package) {
108 cpumask_set_cpu(i, &cpu_core_map[cpu]);
109 cpumask_set_cpu(cpu, &cpu_core_map[i]);
115 * Calculate a new cpu_foreign_map mask whenever a
116 * new cpu appears or disappears.
118 static inline void calculate_cpu_foreign_map(void)
120 int i, k, core_present;
121 cpumask_t temp_foreign_map;
123 /* Re-calculate the mask */
124 cpumask_clear(&temp_foreign_map);
125 for_each_online_cpu(i) {
127 for_each_cpu(k, &temp_foreign_map)
128 if (cpu_data[i].package == cpu_data[k].package &&
129 cpu_data[i].core == cpu_data[k].core)
132 cpumask_set_cpu(i, &temp_foreign_map);
135 cpumask_copy(&cpu_foreign_map, &temp_foreign_map);
138 struct plat_smp_ops *mp_ops;
139 EXPORT_SYMBOL(mp_ops);
141 void register_smp_ops(struct plat_smp_ops *ops)
144 printk(KERN_WARNING "Overriding previously set SMP ops\n");
150 * First C code run on the secondary CPUs after being started up by
153 asmlinkage void start_secondary(void)
158 per_cpu_trap_init(false);
159 mips_clockevent_init();
160 mp_ops->init_secondary();
165 * XXX parity protection should be folded in here when it's converted
166 * to an option instead of something based on .cputype
171 cpu = smp_processor_id();
172 cpu_data[cpu].udelay_val = loops_per_jiffy;
174 cpumask_set_cpu(cpu, &cpu_coherent_mask);
175 notify_cpu_starting(cpu);
177 set_cpu_online(cpu, true);
179 set_cpu_sibling_map(cpu);
180 set_cpu_core_map(cpu);
182 calculate_cpu_foreign_map();
184 cpumask_set_cpu(cpu, &cpu_callin_map);
186 synchronise_count_slave(cpu);
189 * irq will be enabled in ->smp_finish(), enabling it too early
192 WARN_ON_ONCE(!irqs_disabled());
193 mp_ops->smp_finish();
195 cpu_startup_entry(CPUHP_ONLINE);
198 static void stop_this_cpu(void *dummy)
201 * Remove this CPU. Be a bit slow here and
202 * set the bits for every online CPU so we don't miss
203 * any IPI whilst taking this VPE down.
206 cpumask_copy(&cpu_foreign_map, cpu_online_mask);
208 /* Make it visible to every other CPU */
211 set_cpu_online(smp_processor_id(), false);
212 calculate_cpu_foreign_map();
217 void smp_send_stop(void)
219 smp_call_function(stop_this_cpu, NULL, 0);
222 void __init smp_cpus_done(unsigned int max_cpus)
226 /* called from main before smp_init() */
227 void __init smp_prepare_cpus(unsigned int max_cpus)
229 init_new_context(current, &init_mm);
230 current_thread_info()->cpu = 0;
231 mp_ops->prepare_cpus(max_cpus);
232 set_cpu_sibling_map(0);
234 calculate_cpu_foreign_map();
235 #ifndef CONFIG_HOTPLUG_CPU
236 init_cpu_present(cpu_possible_mask);
238 cpumask_copy(&cpu_coherent_mask, cpu_possible_mask);
241 /* preload SMP state for boot cpu */
242 void smp_prepare_boot_cpu(void)
244 set_cpu_possible(0, true);
245 set_cpu_online(0, true);
246 cpumask_set_cpu(0, &cpu_callin_map);
249 int __cpu_up(unsigned int cpu, struct task_struct *tidle)
251 mp_ops->boot_secondary(cpu, tidle);
254 * Trust is futile. We should really have timeouts ...
256 while (!cpumask_test_cpu(cpu, &cpu_callin_map)) {
261 synchronise_count_master(cpu);
265 /* Not really SMP stuff ... */
266 int setup_profiling_timer(unsigned int multiplier)
271 static void flush_tlb_all_ipi(void *info)
273 local_flush_tlb_all();
276 void flush_tlb_all(void)
278 on_each_cpu(flush_tlb_all_ipi, NULL, 1);
281 static void flush_tlb_mm_ipi(void *mm)
283 local_flush_tlb_mm((struct mm_struct *)mm);
287 * Special Variant of smp_call_function for use by TLB functions:
290 * o collapses to normal function call on UP kernels
291 * o collapses to normal function call on systems with a single shared
294 static inline void smp_on_other_tlbs(void (*func) (void *info), void *info)
296 smp_call_function(func, info, 1);
299 static inline void smp_on_each_tlb(void (*func) (void *info), void *info)
303 smp_on_other_tlbs(func, info);
310 * The following tlb flush calls are invoked when old translations are
311 * being torn down, or pte attributes are changing. For single threaded
312 * address spaces, a new context is obtained on the current cpu, and tlb
313 * context on other cpus are invalidated to force a new context allocation
314 * at switch_mm time, should the mm ever be used on other cpus. For
315 * multithreaded address spaces, intercpu interrupts have to be sent.
316 * Another case where intercpu interrupts are required is when the target
317 * mm might be active on another cpu (eg debuggers doing the flushes on
318 * behalf of debugees, kswapd stealing pages from another process etc).
322 void flush_tlb_mm(struct mm_struct *mm)
326 if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
327 smp_on_other_tlbs(flush_tlb_mm_ipi, mm);
331 for_each_online_cpu(cpu) {
332 if (cpu != smp_processor_id() && cpu_context(cpu, mm))
333 cpu_context(cpu, mm) = 0;
336 local_flush_tlb_mm(mm);
341 struct flush_tlb_data {
342 struct vm_area_struct *vma;
347 static void flush_tlb_range_ipi(void *info)
349 struct flush_tlb_data *fd = info;
351 local_flush_tlb_range(fd->vma, fd->addr1, fd->addr2);
354 void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
356 struct mm_struct *mm = vma->vm_mm;
359 if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
360 struct flush_tlb_data fd = {
366 smp_on_other_tlbs(flush_tlb_range_ipi, &fd);
370 for_each_online_cpu(cpu) {
371 if (cpu != smp_processor_id() && cpu_context(cpu, mm))
372 cpu_context(cpu, mm) = 0;
375 local_flush_tlb_range(vma, start, end);
379 static void flush_tlb_kernel_range_ipi(void *info)
381 struct flush_tlb_data *fd = info;
383 local_flush_tlb_kernel_range(fd->addr1, fd->addr2);
386 void flush_tlb_kernel_range(unsigned long start, unsigned long end)
388 struct flush_tlb_data fd = {
393 on_each_cpu(flush_tlb_kernel_range_ipi, &fd, 1);
396 static void flush_tlb_page_ipi(void *info)
398 struct flush_tlb_data *fd = info;
400 local_flush_tlb_page(fd->vma, fd->addr1);
403 void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
406 if ((atomic_read(&vma->vm_mm->mm_users) != 1) || (current->mm != vma->vm_mm)) {
407 struct flush_tlb_data fd = {
412 smp_on_other_tlbs(flush_tlb_page_ipi, &fd);
416 for_each_online_cpu(cpu) {
417 if (cpu != smp_processor_id() && cpu_context(cpu, vma->vm_mm))
418 cpu_context(cpu, vma->vm_mm) = 0;
421 local_flush_tlb_page(vma, page);
425 static void flush_tlb_one_ipi(void *info)
427 unsigned long vaddr = (unsigned long) info;
429 local_flush_tlb_one(vaddr);
432 void flush_tlb_one(unsigned long vaddr)
434 smp_on_each_tlb(flush_tlb_one_ipi, (void *) vaddr);
437 EXPORT_SYMBOL(flush_tlb_page);
438 EXPORT_SYMBOL(flush_tlb_one);
440 #if defined(CONFIG_KEXEC)
441 void (*dump_ipi_function_ptr)(void *) = NULL;
442 void dump_send_ipi(void (*dump_ipi_callback)(void *))
445 int cpu = smp_processor_id();
447 dump_ipi_function_ptr = dump_ipi_callback;
449 for_each_online_cpu(i)
451 mp_ops->send_ipi_single(i, SMP_DUMP);
454 EXPORT_SYMBOL(dump_send_ipi);
457 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
459 static DEFINE_PER_CPU(atomic_t, tick_broadcast_count);
460 static DEFINE_PER_CPU(struct call_single_data, tick_broadcast_csd);
462 void tick_broadcast(const struct cpumask *mask)
465 struct call_single_data *csd;
468 for_each_cpu(cpu, mask) {
469 count = &per_cpu(tick_broadcast_count, cpu);
470 csd = &per_cpu(tick_broadcast_csd, cpu);
472 if (atomic_inc_return(count) == 1)
473 smp_call_function_single_async(cpu, csd);
477 static void tick_broadcast_callee(void *info)
479 int cpu = smp_processor_id();
480 tick_receive_broadcast();
481 atomic_set(&per_cpu(tick_broadcast_count, cpu), 0);
484 static int __init tick_broadcast_init(void)
486 struct call_single_data *csd;
489 for (cpu = 0; cpu < NR_CPUS; cpu++) {
490 csd = &per_cpu(tick_broadcast_csd, cpu);
491 csd->func = tick_broadcast_callee;
496 early_initcall(tick_broadcast_init);
498 #endif /* CONFIG_GENERIC_CLOCKEVENTS_BROADCAST */