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/spinlock.h>
26 #include <linux/threads.h>
27 #include <linux/module.h>
28 #include <linux/time.h>
29 #include <linux/timex.h>
30 #include <linux/sched.h>
31 #include <linux/cpumask.h>
32 #include <linux/cpu.h>
33 #include <linux/err.h>
35 #include <asm/atomic.h>
37 #include <asm/processor.h>
38 #include <asm/r4k-timer.h>
39 #include <asm/system.h>
40 #include <asm/mmu_context.h>
43 #ifdef CONFIG_MIPS_MT_SMTC
44 #include <asm/mipsmtregs.h>
45 #endif /* CONFIG_MIPS_MT_SMTC */
47 cpumask_t phys_cpu_present_map
; /* Bitmask of available CPUs */
48 volatile cpumask_t cpu_callin_map
; /* Bitmask of started secondaries */
49 cpumask_t cpu_online_map
; /* Bitmask of currently online CPUs */
50 int __cpu_number_map
[NR_CPUS
]; /* Map physical to logical */
51 int __cpu_logical_map
[NR_CPUS
]; /* Map logical to physical */
53 EXPORT_SYMBOL(phys_cpu_present_map
);
54 EXPORT_SYMBOL(cpu_online_map
);
56 extern void cpu_idle(void);
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
;
88 __cpuinit
void register_smp_ops(struct plat_smp_ops
*ops
)
91 printk(KERN_WARNING
"Overriding previously set SMP ops\n");
97 * First C code run on the secondary CPUs after being started up by
100 asmlinkage __cpuinit
void start_secondary(void)
104 #ifdef CONFIG_MIPS_MT_SMTC
105 /* Only do cpu_probe for first TC of CPU */
106 if ((read_c0_tcbind() & TCBIND_CURTC
) == 0)
107 #endif /* CONFIG_MIPS_MT_SMTC */
111 mips_clockevent_init();
112 mp_ops
->init_secondary();
115 * XXX parity protection should be folded in here when it's converted
116 * to an option instead of something based on .cputype
121 cpu
= smp_processor_id();
122 cpu_data
[cpu
].udelay_val
= loops_per_jiffy
;
124 notify_cpu_starting(cpu
);
126 mp_ops
->smp_finish();
127 set_cpu_sibling_map(cpu
);
129 cpu_set(cpu
, cpu_callin_map
);
131 synchronise_count_slave();
136 void arch_send_call_function_ipi(cpumask_t mask
)
138 mp_ops
->send_ipi_mask(mask
, SMP_CALL_FUNCTION
);
142 * We reuse the same vector for the single IPI
144 void arch_send_call_function_single_ipi(int cpu
)
146 mp_ops
->send_ipi_mask(cpumask_of_cpu(cpu
), SMP_CALL_FUNCTION
);
150 * Call into both interrupt handlers, as we share the IPI for them
152 void smp_call_function_interrupt(void)
155 generic_smp_call_function_single_interrupt();
156 generic_smp_call_function_interrupt();
160 static void stop_this_cpu(void *dummy
)
165 cpu_clear(smp_processor_id(), cpu_online_map
);
168 (*cpu_wait
)(); /* Wait if available. */
172 void smp_send_stop(void)
174 smp_call_function(stop_this_cpu
, NULL
, 0);
177 void __init
smp_cpus_done(unsigned int max_cpus
)
180 synchronise_count_master();
183 /* called from main before smp_init() */
184 void __init
smp_prepare_cpus(unsigned int max_cpus
)
186 init_new_context(current
, &init_mm
);
187 current_thread_info()->cpu
= 0;
188 mp_ops
->prepare_cpus(max_cpus
);
189 set_cpu_sibling_map(0);
190 #ifndef CONFIG_HOTPLUG_CPU
191 cpu_present_map
= cpu_possible_map
;
195 /* preload SMP state for boot cpu */
196 void __devinit
smp_prepare_boot_cpu(void)
198 cpu_set(0, phys_cpu_present_map
);
199 cpu_set(0, cpu_online_map
);
200 cpu_set(0, cpu_callin_map
);
204 * Called once for each "cpu_possible(cpu)". Needs to spin up the cpu
205 * and keep control until "cpu_online(cpu)" is set. Note: cpu is
206 * physical, not logical.
208 int __cpuinit
__cpu_up(unsigned int cpu
)
210 struct task_struct
*idle
;
213 * Processor goes to start_secondary(), sets online flag
214 * The following code is purely to make sure
215 * Linux can schedule processes on this slave.
217 idle
= fork_idle(cpu
);
219 panic(KERN_ERR
"Fork failed for CPU %d", cpu
);
221 mp_ops
->boot_secondary(cpu
, idle
);
224 * Trust is futile. We should really have timeouts ...
226 while (!cpu_isset(cpu
, cpu_callin_map
))
229 cpu_set(cpu
, cpu_online_map
);
234 /* Not really SMP stuff ... */
235 int setup_profiling_timer(unsigned int multiplier
)
240 static void flush_tlb_all_ipi(void *info
)
242 local_flush_tlb_all();
245 void flush_tlb_all(void)
247 on_each_cpu(flush_tlb_all_ipi
, NULL
, 1);
250 static void flush_tlb_mm_ipi(void *mm
)
252 local_flush_tlb_mm((struct mm_struct
*)mm
);
256 * Special Variant of smp_call_function for use by TLB functions:
259 * o collapses to normal function call on UP kernels
260 * o collapses to normal function call on systems with a single shared
262 * o CONFIG_MIPS_MT_SMTC currently implies there is only one physical core.
264 static inline void smp_on_other_tlbs(void (*func
) (void *info
), void *info
)
266 #ifndef CONFIG_MIPS_MT_SMTC
267 smp_call_function(func
, info
, 1);
271 static inline void smp_on_each_tlb(void (*func
) (void *info
), void *info
)
275 smp_on_other_tlbs(func
, info
);
282 * The following tlb flush calls are invoked when old translations are
283 * being torn down, or pte attributes are changing. For single threaded
284 * address spaces, a new context is obtained on the current cpu, and tlb
285 * context on other cpus are invalidated to force a new context allocation
286 * at switch_mm time, should the mm ever be used on other cpus. For
287 * multithreaded address spaces, intercpu interrupts have to be sent.
288 * Another case where intercpu interrupts are required is when the target
289 * mm might be active on another cpu (eg debuggers doing the flushes on
290 * behalf of debugees, kswapd stealing pages from another process etc).
294 void flush_tlb_mm(struct mm_struct
*mm
)
298 if ((atomic_read(&mm
->mm_users
) != 1) || (current
->mm
!= mm
)) {
299 smp_on_other_tlbs(flush_tlb_mm_ipi
, mm
);
301 cpumask_t mask
= cpu_online_map
;
304 cpu_clear(smp_processor_id(), mask
);
305 for_each_cpu_mask(cpu
, mask
)
306 if (cpu_context(cpu
, mm
))
307 cpu_context(cpu
, mm
) = 0;
309 local_flush_tlb_mm(mm
);
314 struct flush_tlb_data
{
315 struct vm_area_struct
*vma
;
320 static void flush_tlb_range_ipi(void *info
)
322 struct flush_tlb_data
*fd
= info
;
324 local_flush_tlb_range(fd
->vma
, fd
->addr1
, fd
->addr2
);
327 void flush_tlb_range(struct vm_area_struct
*vma
, unsigned long start
, unsigned long end
)
329 struct mm_struct
*mm
= vma
->vm_mm
;
332 if ((atomic_read(&mm
->mm_users
) != 1) || (current
->mm
!= mm
)) {
333 struct flush_tlb_data fd
= {
339 smp_on_other_tlbs(flush_tlb_range_ipi
, &fd
);
341 cpumask_t mask
= cpu_online_map
;
344 cpu_clear(smp_processor_id(), mask
);
345 for_each_cpu_mask(cpu
, mask
)
346 if (cpu_context(cpu
, mm
))
347 cpu_context(cpu
, mm
) = 0;
349 local_flush_tlb_range(vma
, start
, end
);
353 static void flush_tlb_kernel_range_ipi(void *info
)
355 struct flush_tlb_data
*fd
= info
;
357 local_flush_tlb_kernel_range(fd
->addr1
, fd
->addr2
);
360 void flush_tlb_kernel_range(unsigned long start
, unsigned long end
)
362 struct flush_tlb_data fd
= {
367 on_each_cpu(flush_tlb_kernel_range_ipi
, &fd
, 1);
370 static void flush_tlb_page_ipi(void *info
)
372 struct flush_tlb_data
*fd
= info
;
374 local_flush_tlb_page(fd
->vma
, fd
->addr1
);
377 void flush_tlb_page(struct vm_area_struct
*vma
, unsigned long page
)
380 if ((atomic_read(&vma
->vm_mm
->mm_users
) != 1) || (current
->mm
!= vma
->vm_mm
)) {
381 struct flush_tlb_data fd
= {
386 smp_on_other_tlbs(flush_tlb_page_ipi
, &fd
);
388 cpumask_t mask
= cpu_online_map
;
391 cpu_clear(smp_processor_id(), mask
);
392 for_each_cpu_mask(cpu
, mask
)
393 if (cpu_context(cpu
, vma
->vm_mm
))
394 cpu_context(cpu
, vma
->vm_mm
) = 0;
396 local_flush_tlb_page(vma
, page
);
400 static void flush_tlb_one_ipi(void *info
)
402 unsigned long vaddr
= (unsigned long) info
;
404 local_flush_tlb_one(vaddr
);
407 void flush_tlb_one(unsigned long vaddr
)
409 smp_on_each_tlb(flush_tlb_one_ipi
, (void *) vaddr
);
412 EXPORT_SYMBOL(flush_tlb_page
);
413 EXPORT_SYMBOL(flush_tlb_one
);