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>
40 #include <asm/r4k-timer.h>
41 #include <asm/mmu_context.h>
43 #include <asm/setup.h>
45 #ifdef CONFIG_MIPS_MT_SMTC
46 #include <asm/mipsmtregs.h>
47 #endif /* CONFIG_MIPS_MT_SMTC */
49 volatile cpumask_t cpu_callin_map
; /* Bitmask of started secondaries */
51 int __cpu_number_map
[NR_CPUS
]; /* Map physical to logical */
52 EXPORT_SYMBOL(__cpu_number_map
);
54 int __cpu_logical_map
[NR_CPUS
]; /* Map logical to physical */
55 EXPORT_SYMBOL(__cpu_logical_map
);
57 /* Number of TCs (or siblings in Intel speak) per CPU core */
58 int smp_num_siblings
= 1;
59 EXPORT_SYMBOL(smp_num_siblings
);
61 /* representing the TCs (or siblings in Intel speak) of each logical CPU */
62 cpumask_t cpu_sibling_map
[NR_CPUS
] __read_mostly
;
63 EXPORT_SYMBOL(cpu_sibling_map
);
65 /* representing cpus for which sibling maps can be computed */
66 static cpumask_t cpu_sibling_setup_map
;
68 static inline void set_cpu_sibling_map(int cpu
)
72 cpu_set(cpu
, cpu_sibling_setup_map
);
74 if (smp_num_siblings
> 1) {
75 for_each_cpu_mask(i
, cpu_sibling_setup_map
) {
76 if (cpu_data
[cpu
].core
== cpu_data
[i
].core
) {
77 cpu_set(i
, cpu_sibling_map
[cpu
]);
78 cpu_set(cpu
, cpu_sibling_map
[i
]);
82 cpu_set(cpu
, cpu_sibling_map
[cpu
]);
85 struct plat_smp_ops
*mp_ops
;
87 __cpuinit
void register_smp_ops(struct plat_smp_ops
*ops
)
90 printk(KERN_WARNING
"Overriding previously set SMP ops\n");
96 * First C code run on the secondary CPUs after being started up by
99 asmlinkage __cpuinit
void start_secondary(void)
103 #ifdef CONFIG_MIPS_MT_SMTC
104 /* Only do cpu_probe for first TC of CPU */
105 if ((read_c0_tcbind() & TCBIND_CURTC
) == 0)
106 #endif /* CONFIG_MIPS_MT_SMTC */
109 per_cpu_trap_init(false);
110 mips_clockevent_init();
111 mp_ops
->init_secondary();
114 * XXX parity protection should be folded in here when it's converted
115 * to an option instead of something based on .cputype
120 cpu
= smp_processor_id();
121 cpu_data
[cpu
].udelay_val
= loops_per_jiffy
;
123 notify_cpu_starting(cpu
);
125 mp_ops
->smp_finish();
126 set_cpu_sibling_map(cpu
);
128 cpu_set(cpu
, cpu_callin_map
);
130 synchronise_count_slave();
136 * Call into both interrupt handlers, as we share the IPI for them
138 void __irq_entry
smp_call_function_interrupt(void)
141 generic_smp_call_function_single_interrupt();
142 generic_smp_call_function_interrupt();
146 static void stop_this_cpu(void *dummy
)
151 set_cpu_online(smp_processor_id(), false);
154 (*cpu_wait
)(); /* Wait if available. */
158 void smp_send_stop(void)
160 smp_call_function(stop_this_cpu
, NULL
, 0);
163 void __init
smp_cpus_done(unsigned int max_cpus
)
166 synchronise_count_master();
169 /* called from main before smp_init() */
170 void __init
smp_prepare_cpus(unsigned int max_cpus
)
172 init_new_context(current
, &init_mm
);
173 current_thread_info()->cpu
= 0;
174 mp_ops
->prepare_cpus(max_cpus
);
175 set_cpu_sibling_map(0);
176 #ifndef CONFIG_HOTPLUG_CPU
177 init_cpu_present(cpu_possible_mask
);
181 /* preload SMP state for boot cpu */
182 void __devinit
smp_prepare_boot_cpu(void)
184 set_cpu_possible(0, true);
185 set_cpu_online(0, true);
186 cpu_set(0, cpu_callin_map
);
189 int __cpuinit
__cpu_up(unsigned int cpu
, struct task_struct
*tidle
)
191 mp_ops
->boot_secondary(cpu
, tidle
);
194 * Trust is futile. We should really have timeouts ...
196 while (!cpu_isset(cpu
, cpu_callin_map
))
199 set_cpu_online(cpu
, true);
204 /* Not really SMP stuff ... */
205 int setup_profiling_timer(unsigned int multiplier
)
210 static void flush_tlb_all_ipi(void *info
)
212 local_flush_tlb_all();
215 void flush_tlb_all(void)
217 on_each_cpu(flush_tlb_all_ipi
, NULL
, 1);
220 static void flush_tlb_mm_ipi(void *mm
)
222 local_flush_tlb_mm((struct mm_struct
*)mm
);
226 * Special Variant of smp_call_function for use by TLB functions:
229 * o collapses to normal function call on UP kernels
230 * o collapses to normal function call on systems with a single shared
232 * o CONFIG_MIPS_MT_SMTC currently implies there is only one physical core.
234 static inline void smp_on_other_tlbs(void (*func
) (void *info
), void *info
)
236 #ifndef CONFIG_MIPS_MT_SMTC
237 smp_call_function(func
, info
, 1);
241 static inline void smp_on_each_tlb(void (*func
) (void *info
), void *info
)
245 smp_on_other_tlbs(func
, info
);
252 * The following tlb flush calls are invoked when old translations are
253 * being torn down, or pte attributes are changing. For single threaded
254 * address spaces, a new context is obtained on the current cpu, and tlb
255 * context on other cpus are invalidated to force a new context allocation
256 * at switch_mm time, should the mm ever be used on other cpus. For
257 * multithreaded address spaces, intercpu interrupts have to be sent.
258 * Another case where intercpu interrupts are required is when the target
259 * mm might be active on another cpu (eg debuggers doing the flushes on
260 * behalf of debugees, kswapd stealing pages from another process etc).
264 void flush_tlb_mm(struct mm_struct
*mm
)
268 if ((atomic_read(&mm
->mm_users
) != 1) || (current
->mm
!= mm
)) {
269 smp_on_other_tlbs(flush_tlb_mm_ipi
, mm
);
273 for_each_online_cpu(cpu
) {
274 if (cpu
!= smp_processor_id() && cpu_context(cpu
, mm
))
275 cpu_context(cpu
, mm
) = 0;
278 local_flush_tlb_mm(mm
);
283 struct flush_tlb_data
{
284 struct vm_area_struct
*vma
;
289 static void flush_tlb_range_ipi(void *info
)
291 struct flush_tlb_data
*fd
= info
;
293 local_flush_tlb_range(fd
->vma
, fd
->addr1
, fd
->addr2
);
296 void flush_tlb_range(struct vm_area_struct
*vma
, unsigned long start
, unsigned long end
)
298 struct mm_struct
*mm
= vma
->vm_mm
;
301 if ((atomic_read(&mm
->mm_users
) != 1) || (current
->mm
!= mm
)) {
302 struct flush_tlb_data fd
= {
308 smp_on_other_tlbs(flush_tlb_range_ipi
, &fd
);
312 for_each_online_cpu(cpu
) {
313 if (cpu
!= smp_processor_id() && cpu_context(cpu
, mm
))
314 cpu_context(cpu
, mm
) = 0;
317 local_flush_tlb_range(vma
, start
, end
);
321 static void flush_tlb_kernel_range_ipi(void *info
)
323 struct flush_tlb_data
*fd
= info
;
325 local_flush_tlb_kernel_range(fd
->addr1
, fd
->addr2
);
328 void flush_tlb_kernel_range(unsigned long start
, unsigned long end
)
330 struct flush_tlb_data fd
= {
335 on_each_cpu(flush_tlb_kernel_range_ipi
, &fd
, 1);
338 static void flush_tlb_page_ipi(void *info
)
340 struct flush_tlb_data
*fd
= info
;
342 local_flush_tlb_page(fd
->vma
, fd
->addr1
);
345 void flush_tlb_page(struct vm_area_struct
*vma
, unsigned long page
)
348 if ((atomic_read(&vma
->vm_mm
->mm_users
) != 1) || (current
->mm
!= vma
->vm_mm
)) {
349 struct flush_tlb_data fd
= {
354 smp_on_other_tlbs(flush_tlb_page_ipi
, &fd
);
358 for_each_online_cpu(cpu
) {
359 if (cpu
!= smp_processor_id() && cpu_context(cpu
, vma
->vm_mm
))
360 cpu_context(cpu
, vma
->vm_mm
) = 0;
363 local_flush_tlb_page(vma
, page
);
367 static void flush_tlb_one_ipi(void *info
)
369 unsigned long vaddr
= (unsigned long) info
;
371 local_flush_tlb_one(vaddr
);
374 void flush_tlb_one(unsigned long vaddr
)
376 smp_on_each_tlb(flush_tlb_one_ipi
, (void *) vaddr
);
379 EXPORT_SYMBOL(flush_tlb_page
);
380 EXPORT_SYMBOL(flush_tlb_one
);