mm: page_alloc: do not treat a zone that cannot be used for dirty pages as "full"
[linux/fpc-iii.git] / arch / mips / kernel / smp.c
blob0a022ee33b2a15c5c9722e2e9aa5504358ba05f4
1 /*
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>
38 #include <asm/cpu.h>
39 #include <asm/processor.h>
40 #include <asm/idle.h>
41 #include <asm/r4k-timer.h>
42 #include <asm/mmu_context.h>
43 #include <asm/time.h>
44 #include <asm/setup.h>
46 #ifdef CONFIG_MIPS_MT_SMTC
47 #include <asm/mipsmtregs.h>
48 #endif /* CONFIG_MIPS_MT_SMTC */
50 volatile cpumask_t cpu_callin_map; /* Bitmask of started secondaries */
52 int __cpu_number_map[NR_CPUS]; /* Map physical to logical */
53 EXPORT_SYMBOL(__cpu_number_map);
55 int __cpu_logical_map[NR_CPUS]; /* Map logical to physical */
56 EXPORT_SYMBOL(__cpu_logical_map);
58 /* Number of TCs (or siblings in Intel speak) per CPU core */
59 int smp_num_siblings = 1;
60 EXPORT_SYMBOL(smp_num_siblings);
62 /* representing the TCs (or siblings in Intel speak) of each logical CPU */
63 cpumask_t cpu_sibling_map[NR_CPUS] __read_mostly;
64 EXPORT_SYMBOL(cpu_sibling_map);
66 /* representing cpus for which sibling maps can be computed */
67 static cpumask_t cpu_sibling_setup_map;
69 static inline void set_cpu_sibling_map(int cpu)
71 int i;
73 cpu_set(cpu, cpu_sibling_setup_map);
75 if (smp_num_siblings > 1) {
76 for_each_cpu_mask(i, cpu_sibling_setup_map) {
77 if (cpu_data[cpu].core == cpu_data[i].core) {
78 cpu_set(i, cpu_sibling_map[cpu]);
79 cpu_set(cpu, cpu_sibling_map[i]);
82 } else
83 cpu_set(cpu, cpu_sibling_map[cpu]);
86 struct plat_smp_ops *mp_ops;
87 EXPORT_SYMBOL(mp_ops);
89 void register_smp_ops(struct plat_smp_ops *ops)
91 if (mp_ops)
92 printk(KERN_WARNING "Overriding previously set SMP ops\n");
94 mp_ops = ops;
98 * First C code run on the secondary CPUs after being started up by
99 * the master.
101 asmlinkage void start_secondary(void)
103 unsigned int cpu;
105 #ifdef CONFIG_MIPS_MT_SMTC
106 /* Only do cpu_probe for first TC of CPU */
107 if ((read_c0_tcbind() & TCBIND_CURTC) != 0)
108 __cpu_name[smp_processor_id()] = __cpu_name[0];
109 else
110 #endif /* CONFIG_MIPS_MT_SMTC */
111 cpu_probe();
112 cpu_report();
113 per_cpu_trap_init(false);
114 mips_clockevent_init();
115 mp_ops->init_secondary();
118 * XXX parity protection should be folded in here when it's converted
119 * to an option instead of something based on .cputype
122 calibrate_delay();
123 preempt_disable();
124 cpu = smp_processor_id();
125 cpu_data[cpu].udelay_val = loops_per_jiffy;
127 notify_cpu_starting(cpu);
129 set_cpu_online(cpu, true);
131 set_cpu_sibling_map(cpu);
133 cpu_set(cpu, cpu_callin_map);
135 synchronise_count_slave(cpu);
138 * irq will be enabled in ->smp_finish(), enabling it too early
139 * is dangerous.
141 WARN_ON_ONCE(!irqs_disabled());
142 mp_ops->smp_finish();
144 cpu_startup_entry(CPUHP_ONLINE);
148 * Call into both interrupt handlers, as we share the IPI for them
150 void __irq_entry smp_call_function_interrupt(void)
152 irq_enter();
153 generic_smp_call_function_interrupt();
154 irq_exit();
157 static void stop_this_cpu(void *dummy)
160 * Remove this CPU:
162 set_cpu_online(smp_processor_id(), false);
163 for (;;) {
164 if (cpu_wait)
165 (*cpu_wait)(); /* Wait if available. */
169 void smp_send_stop(void)
171 smp_call_function(stop_this_cpu, NULL, 0);
174 void __init smp_cpus_done(unsigned int max_cpus)
176 mp_ops->cpus_done();
179 /* called from main before smp_init() */
180 void __init smp_prepare_cpus(unsigned int max_cpus)
182 init_new_context(current, &init_mm);
183 current_thread_info()->cpu = 0;
184 mp_ops->prepare_cpus(max_cpus);
185 set_cpu_sibling_map(0);
186 #ifndef CONFIG_HOTPLUG_CPU
187 init_cpu_present(cpu_possible_mask);
188 #endif
191 /* preload SMP state for boot cpu */
192 void smp_prepare_boot_cpu(void)
194 set_cpu_possible(0, true);
195 set_cpu_online(0, true);
196 cpu_set(0, cpu_callin_map);
199 int __cpu_up(unsigned int cpu, struct task_struct *tidle)
201 mp_ops->boot_secondary(cpu, tidle);
204 * Trust is futile. We should really have timeouts ...
206 while (!cpu_isset(cpu, cpu_callin_map))
207 udelay(100);
209 synchronise_count_master(cpu);
210 return 0;
213 /* Not really SMP stuff ... */
214 int setup_profiling_timer(unsigned int multiplier)
216 return 0;
219 static void flush_tlb_all_ipi(void *info)
221 local_flush_tlb_all();
224 void flush_tlb_all(void)
226 on_each_cpu(flush_tlb_all_ipi, NULL, 1);
229 static void flush_tlb_mm_ipi(void *mm)
231 local_flush_tlb_mm((struct mm_struct *)mm);
235 * Special Variant of smp_call_function for use by TLB functions:
237 * o No return value
238 * o collapses to normal function call on UP kernels
239 * o collapses to normal function call on systems with a single shared
240 * primary cache.
241 * o CONFIG_MIPS_MT_SMTC currently implies there is only one physical core.
243 static inline void smp_on_other_tlbs(void (*func) (void *info), void *info)
245 #ifndef CONFIG_MIPS_MT_SMTC
246 smp_call_function(func, info, 1);
247 #endif
250 static inline void smp_on_each_tlb(void (*func) (void *info), void *info)
252 preempt_disable();
254 smp_on_other_tlbs(func, info);
255 func(info);
257 preempt_enable();
261 * The following tlb flush calls are invoked when old translations are
262 * being torn down, or pte attributes are changing. For single threaded
263 * address spaces, a new context is obtained on the current cpu, and tlb
264 * context on other cpus are invalidated to force a new context allocation
265 * at switch_mm time, should the mm ever be used on other cpus. For
266 * multithreaded address spaces, intercpu interrupts have to be sent.
267 * Another case where intercpu interrupts are required is when the target
268 * mm might be active on another cpu (eg debuggers doing the flushes on
269 * behalf of debugees, kswapd stealing pages from another process etc).
270 * Kanoj 07/00.
273 void flush_tlb_mm(struct mm_struct *mm)
275 preempt_disable();
277 if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
278 smp_on_other_tlbs(flush_tlb_mm_ipi, mm);
279 } else {
280 unsigned int cpu;
282 for_each_online_cpu(cpu) {
283 if (cpu != smp_processor_id() && cpu_context(cpu, mm))
284 cpu_context(cpu, mm) = 0;
287 local_flush_tlb_mm(mm);
289 preempt_enable();
292 struct flush_tlb_data {
293 struct vm_area_struct *vma;
294 unsigned long addr1;
295 unsigned long addr2;
298 static void flush_tlb_range_ipi(void *info)
300 struct flush_tlb_data *fd = info;
302 local_flush_tlb_range(fd->vma, fd->addr1, fd->addr2);
305 void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
307 struct mm_struct *mm = vma->vm_mm;
309 preempt_disable();
310 if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
311 struct flush_tlb_data fd = {
312 .vma = vma,
313 .addr1 = start,
314 .addr2 = end,
317 smp_on_other_tlbs(flush_tlb_range_ipi, &fd);
318 } else {
319 unsigned int cpu;
321 for_each_online_cpu(cpu) {
322 if (cpu != smp_processor_id() && cpu_context(cpu, mm))
323 cpu_context(cpu, mm) = 0;
326 local_flush_tlb_range(vma, start, end);
327 preempt_enable();
330 static void flush_tlb_kernel_range_ipi(void *info)
332 struct flush_tlb_data *fd = info;
334 local_flush_tlb_kernel_range(fd->addr1, fd->addr2);
337 void flush_tlb_kernel_range(unsigned long start, unsigned long end)
339 struct flush_tlb_data fd = {
340 .addr1 = start,
341 .addr2 = end,
344 on_each_cpu(flush_tlb_kernel_range_ipi, &fd, 1);
347 static void flush_tlb_page_ipi(void *info)
349 struct flush_tlb_data *fd = info;
351 local_flush_tlb_page(fd->vma, fd->addr1);
354 void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
356 preempt_disable();
357 if ((atomic_read(&vma->vm_mm->mm_users) != 1) || (current->mm != vma->vm_mm)) {
358 struct flush_tlb_data fd = {
359 .vma = vma,
360 .addr1 = page,
363 smp_on_other_tlbs(flush_tlb_page_ipi, &fd);
364 } else {
365 unsigned int cpu;
367 for_each_online_cpu(cpu) {
368 if (cpu != smp_processor_id() && cpu_context(cpu, vma->vm_mm))
369 cpu_context(cpu, vma->vm_mm) = 0;
372 local_flush_tlb_page(vma, page);
373 preempt_enable();
376 static void flush_tlb_one_ipi(void *info)
378 unsigned long vaddr = (unsigned long) info;
380 local_flush_tlb_one(vaddr);
383 void flush_tlb_one(unsigned long vaddr)
385 smp_on_each_tlb(flush_tlb_one_ipi, (void *) vaddr);
388 EXPORT_SYMBOL(flush_tlb_page);
389 EXPORT_SYMBOL(flush_tlb_one);
391 #if defined(CONFIG_KEXEC)
392 void (*dump_ipi_function_ptr)(void *) = NULL;
393 void dump_send_ipi(void (*dump_ipi_callback)(void *))
395 int i;
396 int cpu = smp_processor_id();
398 dump_ipi_function_ptr = dump_ipi_callback;
399 smp_mb();
400 for_each_online_cpu(i)
401 if (i != cpu)
402 mp_ops->send_ipi_single(i, SMP_DUMP);
405 EXPORT_SYMBOL(dump_send_ipi);
406 #endif