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>
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
)
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
]);
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
)
92 printk(KERN_WARNING
"Overriding previously set SMP ops\n");
98 * First C code run on the secondary CPUs after being started up by
101 asmlinkage
void start_secondary(void)
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];
110 #endif /* CONFIG_MIPS_MT_SMTC */
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
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
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)
153 generic_smp_call_function_interrupt();
157 static void stop_this_cpu(void *dummy
)
162 set_cpu_online(smp_processor_id(), false);
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
)
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
);
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
))
209 synchronise_count_master(cpu
);
213 /* Not really SMP stuff ... */
214 int setup_profiling_timer(unsigned int multiplier
)
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:
238 * o collapses to normal function call on UP kernels
239 * o collapses to normal function call on systems with a single shared
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);
250 static inline void smp_on_each_tlb(void (*func
) (void *info
), void *info
)
254 smp_on_other_tlbs(func
, info
);
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).
273 void flush_tlb_mm(struct mm_struct
*mm
)
277 if ((atomic_read(&mm
->mm_users
) != 1) || (current
->mm
!= mm
)) {
278 smp_on_other_tlbs(flush_tlb_mm_ipi
, mm
);
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
);
292 struct flush_tlb_data
{
293 struct vm_area_struct
*vma
;
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
;
310 if ((atomic_read(&mm
->mm_users
) != 1) || (current
->mm
!= mm
)) {
311 struct flush_tlb_data fd
= {
317 smp_on_other_tlbs(flush_tlb_range_ipi
, &fd
);
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
);
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
= {
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
)
357 if ((atomic_read(&vma
->vm_mm
->mm_users
) != 1) || (current
->mm
!= vma
->vm_mm
)) {
358 struct flush_tlb_data fd
= {
363 smp_on_other_tlbs(flush_tlb_page_ipi
, &fd
);
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
);
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 *))
396 int cpu
= smp_processor_id();
398 dump_ipi_function_ptr
= dump_ipi_callback
;
400 for_each_online_cpu(i
)
402 mp_ops
->send_ipi_single(i
, SMP_DUMP
);
405 EXPORT_SYMBOL(dump_send_ipi
);