1 /* smp.c: Sparc SMP support.
3 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
4 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
5 * Copyright (C) 2004 Keith M Wesolowski (wesolows@foobazco.org)
10 #include <linux/kernel.h>
11 #include <linux/sched.h>
12 #include <linux/threads.h>
13 #include <linux/smp.h>
14 #include <linux/interrupt.h>
15 #include <linux/kernel_stat.h>
16 #include <linux/init.h>
17 #include <linux/spinlock.h>
20 #include <linux/seq_file.h>
21 #include <linux/cache.h>
22 #include <linux/delay.h>
24 #include <asm/ptrace.h>
25 #include <asm/atomic.h>
29 #include <asm/pgalloc.h>
30 #include <asm/pgtable.h>
31 #include <asm/oplib.h>
32 #include <asm/cacheflush.h>
33 #include <asm/tlbflush.h>
34 #include <asm/cpudata.h>
39 volatile unsigned long cpu_callin_map
[NR_CPUS
] __cpuinitdata
= {0,};
40 unsigned char boot_cpu_id
= 0;
41 unsigned char boot_cpu_id4
= 0; /* boot_cpu_id << 2 */
43 cpumask_t smp_commenced_mask
= CPU_MASK_NONE
;
45 /* The only guaranteed locking primitive available on all Sparc
46 * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically
47 * places the current byte at the effective address into dest_reg and
48 * places 0xff there afterwards. Pretty lame locking primitive
49 * compared to the Alpha and the Intel no? Most Sparcs have 'swap'
50 * instruction which is much better...
53 void __cpuinit
smp_store_cpu_info(int id
)
58 cpu_data(id
).udelay_val
= loops_per_jiffy
;
60 cpu_find_by_mid(id
, &cpu_node
);
61 cpu_data(id
).clock_tick
= prom_getintdefault(cpu_node
,
62 "clock-frequency", 0);
63 cpu_data(id
).prom_node
= cpu_node
;
64 mid
= cpu_get_hwmid(cpu_node
);
67 printk(KERN_NOTICE
"No MID found for CPU%d at node 0x%08d", id
, cpu_node
);
70 cpu_data(id
).mid
= mid
;
73 void __init
smp_cpus_done(unsigned int max_cpus
)
75 extern void smp4m_smp_done(void);
76 extern void smp4d_smp_done(void);
77 unsigned long bogosum
= 0;
80 for_each_online_cpu(cpu
) {
82 bogosum
+= cpu_data(cpu
).udelay_val
;
85 printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
86 num
, bogosum
/(500000/HZ
),
87 (bogosum
/(5000/HZ
))%100);
89 switch(sparc_cpu_model
) {
116 printk("UNKNOWN!\n");
124 printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id());
125 panic("SMP bolixed\n");
128 struct linux_prom_registers smp_penguin_ctable __cpuinitdata
= { 0 };
130 void smp_send_reschedule(int cpu
)
135 void smp_send_stop(void)
139 void smp_flush_cache_all(void)
141 xc0((smpfunc_t
) BTFIXUP_CALL(local_flush_cache_all
));
142 local_flush_cache_all();
145 void smp_flush_tlb_all(void)
147 xc0((smpfunc_t
) BTFIXUP_CALL(local_flush_tlb_all
));
148 local_flush_tlb_all();
151 void smp_flush_cache_mm(struct mm_struct
*mm
)
153 if(mm
->context
!= NO_CONTEXT
) {
154 cpumask_t cpu_mask
= *mm_cpumask(mm
);
155 cpu_clear(smp_processor_id(), cpu_mask
);
156 if (!cpus_empty(cpu_mask
))
157 xc1((smpfunc_t
) BTFIXUP_CALL(local_flush_cache_mm
), (unsigned long) mm
);
158 local_flush_cache_mm(mm
);
162 void smp_flush_tlb_mm(struct mm_struct
*mm
)
164 if(mm
->context
!= NO_CONTEXT
) {
165 cpumask_t cpu_mask
= *mm_cpumask(mm
);
166 cpu_clear(smp_processor_id(), cpu_mask
);
167 if (!cpus_empty(cpu_mask
)) {
168 xc1((smpfunc_t
) BTFIXUP_CALL(local_flush_tlb_mm
), (unsigned long) mm
);
169 if(atomic_read(&mm
->mm_users
) == 1 && current
->active_mm
== mm
)
170 cpumask_copy(mm_cpumask(mm
),
171 cpumask_of(smp_processor_id()));
173 local_flush_tlb_mm(mm
);
177 void smp_flush_cache_range(struct vm_area_struct
*vma
, unsigned long start
,
180 struct mm_struct
*mm
= vma
->vm_mm
;
182 if (mm
->context
!= NO_CONTEXT
) {
183 cpumask_t cpu_mask
= *mm_cpumask(mm
);
184 cpu_clear(smp_processor_id(), cpu_mask
);
185 if (!cpus_empty(cpu_mask
))
186 xc3((smpfunc_t
) BTFIXUP_CALL(local_flush_cache_range
), (unsigned long) vma
, start
, end
);
187 local_flush_cache_range(vma
, start
, end
);
191 void smp_flush_tlb_range(struct vm_area_struct
*vma
, unsigned long start
,
194 struct mm_struct
*mm
= vma
->vm_mm
;
196 if (mm
->context
!= NO_CONTEXT
) {
197 cpumask_t cpu_mask
= *mm_cpumask(mm
);
198 cpu_clear(smp_processor_id(), cpu_mask
);
199 if (!cpus_empty(cpu_mask
))
200 xc3((smpfunc_t
) BTFIXUP_CALL(local_flush_tlb_range
), (unsigned long) vma
, start
, end
);
201 local_flush_tlb_range(vma
, start
, end
);
205 void smp_flush_cache_page(struct vm_area_struct
*vma
, unsigned long page
)
207 struct mm_struct
*mm
= vma
->vm_mm
;
209 if(mm
->context
!= NO_CONTEXT
) {
210 cpumask_t cpu_mask
= *mm_cpumask(mm
);
211 cpu_clear(smp_processor_id(), cpu_mask
);
212 if (!cpus_empty(cpu_mask
))
213 xc2((smpfunc_t
) BTFIXUP_CALL(local_flush_cache_page
), (unsigned long) vma
, page
);
214 local_flush_cache_page(vma
, page
);
218 void smp_flush_tlb_page(struct vm_area_struct
*vma
, unsigned long page
)
220 struct mm_struct
*mm
= vma
->vm_mm
;
222 if(mm
->context
!= NO_CONTEXT
) {
223 cpumask_t cpu_mask
= *mm_cpumask(mm
);
224 cpu_clear(smp_processor_id(), cpu_mask
);
225 if (!cpus_empty(cpu_mask
))
226 xc2((smpfunc_t
) BTFIXUP_CALL(local_flush_tlb_page
), (unsigned long) vma
, page
);
227 local_flush_tlb_page(vma
, page
);
231 void smp_reschedule_irq(void)
236 void smp_flush_page_to_ram(unsigned long page
)
238 /* Current theory is that those who call this are the one's
239 * who have just dirtied their cache with the pages contents
240 * in kernel space, therefore we only run this on local cpu.
242 * XXX This experiment failed, research further... -DaveM
245 xc1((smpfunc_t
) BTFIXUP_CALL(local_flush_page_to_ram
), page
);
247 local_flush_page_to_ram(page
);
250 void smp_flush_sig_insns(struct mm_struct
*mm
, unsigned long insn_addr
)
252 cpumask_t cpu_mask
= *mm_cpumask(mm
);
253 cpu_clear(smp_processor_id(), cpu_mask
);
254 if (!cpus_empty(cpu_mask
))
255 xc2((smpfunc_t
) BTFIXUP_CALL(local_flush_sig_insns
), (unsigned long) mm
, insn_addr
);
256 local_flush_sig_insns(mm
, insn_addr
);
259 extern unsigned int lvl14_resolution
;
261 /* /proc/profile writes can call this, don't __init it please. */
262 static DEFINE_SPINLOCK(prof_setup_lock
);
264 int setup_profiling_timer(unsigned int multiplier
)
269 /* Prevent level14 ticker IRQ flooding. */
270 if((!multiplier
) || (lvl14_resolution
/ multiplier
) < 500)
273 spin_lock_irqsave(&prof_setup_lock
, flags
);
274 for_each_possible_cpu(i
) {
275 load_profile_irq(i
, lvl14_resolution
/ multiplier
);
276 prof_multiplier(i
) = multiplier
;
278 spin_unlock_irqrestore(&prof_setup_lock
, flags
);
283 void __init
smp_prepare_cpus(unsigned int max_cpus
)
285 extern void __init
smp4m_boot_cpus(void);
286 extern void __init
smp4d_boot_cpus(void);
289 printk("Entering SMP Mode...\n");
292 for (i
= 0; !cpu_find_by_instance(i
, NULL
, &cpuid
); i
++) {
293 if (cpuid
>= NR_CPUS
)
296 /* i = number of cpus */
297 if (extra
&& max_cpus
> i
- extra
)
298 printk("Warning: NR_CPUS is too low to start all cpus\n");
300 smp_store_cpu_info(boot_cpu_id
);
302 switch(sparc_cpu_model
) {
329 printk("UNKNOWN!\n");
335 /* Set this up early so that things like the scheduler can init
336 * properly. We use the same cpu mask for both the present and
339 void __init
smp_setup_cpu_possible_map(void)
344 while (!cpu_find_by_instance(instance
, NULL
, &mid
)) {
346 set_cpu_possible(mid
, true);
347 set_cpu_present(mid
, true);
353 void __init
smp_prepare_boot_cpu(void)
355 int cpuid
= hard_smp_processor_id();
357 if (cpuid
>= NR_CPUS
) {
358 prom_printf("Serious problem, boot cpu id >= NR_CPUS\n");
362 printk("boot cpu id != 0, this could work but is untested\n");
364 current_thread_info()->cpu
= cpuid
;
365 set_cpu_online(cpuid
, true);
366 set_cpu_possible(cpuid
, true);
369 int __cpuinit
__cpu_up(unsigned int cpu
)
371 extern int __cpuinit
smp4m_boot_one_cpu(int);
372 extern int __cpuinit
smp4d_boot_one_cpu(int);
375 switch(sparc_cpu_model
) {
385 ret
= smp4m_boot_one_cpu(cpu
);
388 ret
= smp4d_boot_one_cpu(cpu
);
391 ret
= leon_boot_one_cpu(cpu
);
402 printk("UNKNOWN!\n");
408 cpu_set(cpu
, smp_commenced_mask
);
409 while (!cpu_online(cpu
))
415 void smp_bogo(struct seq_file
*m
)
419 for_each_online_cpu(i
) {
421 "Cpu%dBogo\t: %lu.%02lu\n",
423 cpu_data(i
).udelay_val
/(500000/HZ
),
424 (cpu_data(i
).udelay_val
/(5000/HZ
))%100);
428 void smp_info(struct seq_file
*m
)
432 seq_printf(m
, "State:\n");
433 for_each_online_cpu(i
)
434 seq_printf(m
, "CPU%d\t\t: online\n", i
);