Commit | Line | Data |
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1da177e4 LT |
1 | /* smp.c: Sparc SMP support. |
2 | * | |
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) | |
6 | */ | |
7 | ||
8 | #include <asm/head.h> | |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/sched.h> | |
12 | #include <linux/threads.h> | |
13 | #include <linux/smp.h> | |
1da177e4 LT |
14 | #include <linux/interrupt.h> |
15 | #include <linux/kernel_stat.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/spinlock.h> | |
18 | #include <linux/mm.h> | |
19 | #include <linux/fs.h> | |
20 | #include <linux/seq_file.h> | |
21 | #include <linux/cache.h> | |
22 | #include <linux/delay.h> | |
23 | ||
24 | #include <asm/ptrace.h> | |
25 | #include <asm/atomic.h> | |
26 | ||
27 | #include <asm/irq.h> | |
28 | #include <asm/page.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> | |
35 | ||
32231a66 AV |
36 | #include "irq.h" |
37 | ||
1da177e4 LT |
38 | int smp_num_cpus = 1; |
39 | volatile unsigned long cpu_callin_map[NR_CPUS] __initdata = {0,}; | |
40 | unsigned char boot_cpu_id = 0; | |
41 | unsigned char boot_cpu_id4 = 0; /* boot_cpu_id << 2 */ | |
42 | int smp_activated = 0; | |
43 | volatile int __cpu_number_map[NR_CPUS]; | |
44 | volatile int __cpu_logical_map[NR_CPUS]; | |
45 | ||
46 | cpumask_t cpu_online_map = CPU_MASK_NONE; | |
47 | cpumask_t phys_cpu_present_map = CPU_MASK_NONE; | |
a54123e2 | 48 | cpumask_t smp_commenced_mask = CPU_MASK_NONE; |
1da177e4 LT |
49 | |
50 | /* The only guaranteed locking primitive available on all Sparc | |
51 | * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically | |
52 | * places the current byte at the effective address into dest_reg and | |
53 | * places 0xff there afterwards. Pretty lame locking primitive | |
54 | * compared to the Alpha and the Intel no? Most Sparcs have 'swap' | |
55 | * instruction which is much better... | |
56 | */ | |
57 | ||
58 | /* Used to make bitops atomic */ | |
59 | unsigned char bitops_spinlock = 0; | |
60 | ||
92d452f0 | 61 | void __cpuinit smp_store_cpu_info(int id) |
1da177e4 LT |
62 | { |
63 | int cpu_node; | |
64 | ||
65 | cpu_data(id).udelay_val = loops_per_jiffy; | |
66 | ||
67 | cpu_find_by_mid(id, &cpu_node); | |
68 | cpu_data(id).clock_tick = prom_getintdefault(cpu_node, | |
69 | "clock-frequency", 0); | |
70 | cpu_data(id).prom_node = cpu_node; | |
71 | cpu_data(id).mid = cpu_get_hwmid(cpu_node); | |
650fb838 | 72 | |
1da177e4 LT |
73 | if (cpu_data(id).mid < 0) |
74 | panic("No MID found for CPU%d at node 0x%08d", id, cpu_node); | |
75 | } | |
76 | ||
77 | void __init smp_cpus_done(unsigned int max_cpus) | |
78 | { | |
a54123e2 | 79 | extern void smp4m_smp_done(void); |
8b3c848c | 80 | extern void smp4d_smp_done(void); |
a54123e2 BB |
81 | unsigned long bogosum = 0; |
82 | int cpu, num; | |
83 | ||
84 | for (cpu = 0, num = 0; cpu < NR_CPUS; cpu++) | |
85 | if (cpu_online(cpu)) { | |
86 | num++; | |
87 | bogosum += cpu_data(cpu).udelay_val; | |
88 | } | |
89 | ||
90 | printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n", | |
91 | num, bogosum/(500000/HZ), | |
92 | (bogosum/(5000/HZ))%100); | |
93 | ||
8b3c848c RB |
94 | switch(sparc_cpu_model) { |
95 | case sun4: | |
96 | printk("SUN4\n"); | |
97 | BUG(); | |
98 | break; | |
99 | case sun4c: | |
100 | printk("SUN4C\n"); | |
101 | BUG(); | |
102 | break; | |
103 | case sun4m: | |
104 | smp4m_smp_done(); | |
105 | break; | |
106 | case sun4d: | |
107 | smp4d_smp_done(); | |
108 | break; | |
109 | case sun4e: | |
110 | printk("SUN4E\n"); | |
111 | BUG(); | |
112 | break; | |
113 | case sun4u: | |
114 | printk("SUN4U\n"); | |
115 | BUG(); | |
116 | break; | |
117 | default: | |
118 | printk("UNKNOWN!\n"); | |
119 | BUG(); | |
120 | break; | |
121 | }; | |
1da177e4 LT |
122 | } |
123 | ||
124 | void cpu_panic(void) | |
125 | { | |
126 | printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id()); | |
127 | panic("SMP bolixed\n"); | |
128 | } | |
129 | ||
130 | struct linux_prom_registers smp_penguin_ctable __initdata = { 0 }; | |
131 | ||
1da177e4 LT |
132 | void smp_send_reschedule(int cpu) |
133 | { | |
134 | /* See sparc64 */ | |
135 | } | |
136 | ||
137 | void smp_send_stop(void) | |
138 | { | |
139 | } | |
140 | ||
141 | void smp_flush_cache_all(void) | |
142 | { | |
143 | xc0((smpfunc_t) BTFIXUP_CALL(local_flush_cache_all)); | |
144 | local_flush_cache_all(); | |
145 | } | |
146 | ||
147 | void smp_flush_tlb_all(void) | |
148 | { | |
149 | xc0((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_all)); | |
150 | local_flush_tlb_all(); | |
151 | } | |
152 | ||
153 | void smp_flush_cache_mm(struct mm_struct *mm) | |
154 | { | |
155 | if(mm->context != NO_CONTEXT) { | |
156 | cpumask_t cpu_mask = mm->cpu_vm_mask; | |
157 | cpu_clear(smp_processor_id(), cpu_mask); | |
158 | if (!cpus_empty(cpu_mask)) | |
159 | xc1((smpfunc_t) BTFIXUP_CALL(local_flush_cache_mm), (unsigned long) mm); | |
160 | local_flush_cache_mm(mm); | |
161 | } | |
162 | } | |
163 | ||
164 | void smp_flush_tlb_mm(struct mm_struct *mm) | |
165 | { | |
166 | if(mm->context != NO_CONTEXT) { | |
167 | cpumask_t cpu_mask = mm->cpu_vm_mask; | |
168 | cpu_clear(smp_processor_id(), cpu_mask); | |
169 | if (!cpus_empty(cpu_mask)) { | |
170 | xc1((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_mm), (unsigned long) mm); | |
171 | if(atomic_read(&mm->mm_users) == 1 && current->active_mm == mm) | |
172 | mm->cpu_vm_mask = cpumask_of_cpu(smp_processor_id()); | |
173 | } | |
174 | local_flush_tlb_mm(mm); | |
175 | } | |
176 | } | |
177 | ||
178 | void smp_flush_cache_range(struct vm_area_struct *vma, unsigned long start, | |
179 | unsigned long end) | |
180 | { | |
181 | struct mm_struct *mm = vma->vm_mm; | |
182 | ||
183 | if (mm->context != NO_CONTEXT) { | |
184 | cpumask_t cpu_mask = mm->cpu_vm_mask; | |
185 | cpu_clear(smp_processor_id(), cpu_mask); | |
186 | if (!cpus_empty(cpu_mask)) | |
187 | xc3((smpfunc_t) BTFIXUP_CALL(local_flush_cache_range), (unsigned long) vma, start, end); | |
188 | local_flush_cache_range(vma, start, end); | |
189 | } | |
190 | } | |
191 | ||
192 | void smp_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, | |
193 | unsigned long end) | |
194 | { | |
195 | struct mm_struct *mm = vma->vm_mm; | |
196 | ||
197 | if (mm->context != NO_CONTEXT) { | |
198 | cpumask_t cpu_mask = mm->cpu_vm_mask; | |
199 | cpu_clear(smp_processor_id(), cpu_mask); | |
200 | if (!cpus_empty(cpu_mask)) | |
201 | xc3((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_range), (unsigned long) vma, start, end); | |
202 | local_flush_tlb_range(vma, start, end); | |
203 | } | |
204 | } | |
205 | ||
206 | void smp_flush_cache_page(struct vm_area_struct *vma, unsigned long page) | |
207 | { | |
208 | struct mm_struct *mm = vma->vm_mm; | |
209 | ||
210 | if(mm->context != NO_CONTEXT) { | |
211 | cpumask_t cpu_mask = mm->cpu_vm_mask; | |
212 | cpu_clear(smp_processor_id(), cpu_mask); | |
213 | if (!cpus_empty(cpu_mask)) | |
214 | xc2((smpfunc_t) BTFIXUP_CALL(local_flush_cache_page), (unsigned long) vma, page); | |
215 | local_flush_cache_page(vma, page); | |
216 | } | |
217 | } | |
218 | ||
219 | void smp_flush_tlb_page(struct vm_area_struct *vma, unsigned long page) | |
220 | { | |
221 | struct mm_struct *mm = vma->vm_mm; | |
222 | ||
223 | if(mm->context != NO_CONTEXT) { | |
224 | cpumask_t cpu_mask = mm->cpu_vm_mask; | |
225 | cpu_clear(smp_processor_id(), cpu_mask); | |
226 | if (!cpus_empty(cpu_mask)) | |
227 | xc2((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_page), (unsigned long) vma, page); | |
228 | local_flush_tlb_page(vma, page); | |
229 | } | |
230 | } | |
231 | ||
232 | void smp_reschedule_irq(void) | |
233 | { | |
234 | set_need_resched(); | |
235 | } | |
236 | ||
237 | void smp_flush_page_to_ram(unsigned long page) | |
238 | { | |
239 | /* Current theory is that those who call this are the one's | |
240 | * who have just dirtied their cache with the pages contents | |
241 | * in kernel space, therefore we only run this on local cpu. | |
242 | * | |
243 | * XXX This experiment failed, research further... -DaveM | |
244 | */ | |
245 | #if 1 | |
246 | xc1((smpfunc_t) BTFIXUP_CALL(local_flush_page_to_ram), page); | |
247 | #endif | |
248 | local_flush_page_to_ram(page); | |
249 | } | |
250 | ||
251 | void smp_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr) | |
252 | { | |
253 | cpumask_t cpu_mask = mm->cpu_vm_mask; | |
254 | cpu_clear(smp_processor_id(), cpu_mask); | |
255 | if (!cpus_empty(cpu_mask)) | |
256 | xc2((smpfunc_t) BTFIXUP_CALL(local_flush_sig_insns), (unsigned long) mm, insn_addr); | |
257 | local_flush_sig_insns(mm, insn_addr); | |
258 | } | |
259 | ||
260 | extern unsigned int lvl14_resolution; | |
261 | ||
262 | /* /proc/profile writes can call this, don't __init it please. */ | |
263 | static DEFINE_SPINLOCK(prof_setup_lock); | |
264 | ||
265 | int setup_profiling_timer(unsigned int multiplier) | |
266 | { | |
267 | int i; | |
268 | unsigned long flags; | |
269 | ||
270 | /* Prevent level14 ticker IRQ flooding. */ | |
271 | if((!multiplier) || (lvl14_resolution / multiplier) < 500) | |
272 | return -EINVAL; | |
273 | ||
274 | spin_lock_irqsave(&prof_setup_lock, flags); | |
fff8efe7 | 275 | for_each_possible_cpu(i) { |
394e3902 | 276 | load_profile_irq(i, lvl14_resolution / multiplier); |
1da177e4 LT |
277 | prof_multiplier(i) = multiplier; |
278 | } | |
279 | spin_unlock_irqrestore(&prof_setup_lock, flags); | |
280 | ||
281 | return 0; | |
282 | } | |
283 | ||
a54123e2 | 284 | void __init smp_prepare_cpus(unsigned int max_cpus) |
1da177e4 | 285 | { |
b4cff846 AV |
286 | extern void __init smp4m_boot_cpus(void); |
287 | extern void __init smp4d_boot_cpus(void); | |
7202fb49 | 288 | int i, cpuid, extra; |
a54123e2 | 289 | |
a54123e2 BB |
290 | printk("Entering SMP Mode...\n"); |
291 | ||
a54123e2 BB |
292 | extra = 0; |
293 | for (i = 0; !cpu_find_by_instance(i, NULL, &cpuid); i++) { | |
7202fb49 | 294 | if (cpuid >= NR_CPUS) |
a54123e2 BB |
295 | extra++; |
296 | } | |
7202fb49 BB |
297 | /* i = number of cpus */ |
298 | if (extra && max_cpus > i - extra) | |
a54123e2 BB |
299 | printk("Warning: NR_CPUS is too low to start all cpus\n"); |
300 | ||
301 | smp_store_cpu_info(boot_cpu_id); | |
302 | ||
8b3c848c RB |
303 | switch(sparc_cpu_model) { |
304 | case sun4: | |
305 | printk("SUN4\n"); | |
306 | BUG(); | |
307 | break; | |
308 | case sun4c: | |
309 | printk("SUN4C\n"); | |
310 | BUG(); | |
311 | break; | |
312 | case sun4m: | |
313 | smp4m_boot_cpus(); | |
314 | break; | |
315 | case sun4d: | |
316 | smp4d_boot_cpus(); | |
317 | break; | |
318 | case sun4e: | |
319 | printk("SUN4E\n"); | |
320 | BUG(); | |
321 | break; | |
322 | case sun4u: | |
323 | printk("SUN4U\n"); | |
324 | BUG(); | |
325 | break; | |
326 | default: | |
327 | printk("UNKNOWN!\n"); | |
328 | BUG(); | |
329 | break; | |
330 | }; | |
1da177e4 LT |
331 | } |
332 | ||
7202fb49 BB |
333 | /* Set this up early so that things like the scheduler can init |
334 | * properly. We use the same cpu mask for both the present and | |
335 | * possible cpu map. | |
336 | */ | |
337 | void __init smp_setup_cpu_possible_map(void) | |
338 | { | |
339 | int instance, mid; | |
340 | ||
341 | instance = 0; | |
342 | while (!cpu_find_by_instance(instance, NULL, &mid)) { | |
343 | if (mid < NR_CPUS) { | |
344 | cpu_set(mid, phys_cpu_present_map); | |
345 | cpu_set(mid, cpu_present_map); | |
346 | } | |
347 | instance++; | |
348 | } | |
349 | } | |
350 | ||
92d452f0 | 351 | void __init smp_prepare_boot_cpu(void) |
1da177e4 | 352 | { |
a54123e2 BB |
353 | int cpuid = hard_smp_processor_id(); |
354 | ||
355 | if (cpuid >= NR_CPUS) { | |
356 | prom_printf("Serious problem, boot cpu id >= NR_CPUS\n"); | |
357 | prom_halt(); | |
358 | } | |
359 | if (cpuid != 0) | |
360 | printk("boot cpu id != 0, this could work but is untested\n"); | |
361 | ||
362 | current_thread_info()->cpu = cpuid; | |
363 | cpu_set(cpuid, cpu_online_map); | |
364 | cpu_set(cpuid, phys_cpu_present_map); | |
1da177e4 LT |
365 | } |
366 | ||
92d452f0 | 367 | int __cpuinit __cpu_up(unsigned int cpu) |
1da177e4 | 368 | { |
b4cff846 AV |
369 | extern int __cpuinit smp4m_boot_one_cpu(int); |
370 | extern int __cpuinit smp4d_boot_one_cpu(int); | |
8b3c848c RB |
371 | int ret=0; |
372 | ||
373 | switch(sparc_cpu_model) { | |
374 | case sun4: | |
375 | printk("SUN4\n"); | |
376 | BUG(); | |
377 | break; | |
378 | case sun4c: | |
379 | printk("SUN4C\n"); | |
380 | BUG(); | |
381 | break; | |
382 | case sun4m: | |
383 | ret = smp4m_boot_one_cpu(cpu); | |
384 | break; | |
385 | case sun4d: | |
386 | ret = smp4d_boot_one_cpu(cpu); | |
387 | break; | |
388 | case sun4e: | |
389 | printk("SUN4E\n"); | |
390 | BUG(); | |
391 | break; | |
392 | case sun4u: | |
393 | printk("SUN4U\n"); | |
394 | BUG(); | |
395 | break; | |
396 | default: | |
397 | printk("UNKNOWN!\n"); | |
398 | BUG(); | |
399 | break; | |
400 | }; | |
a54123e2 BB |
401 | |
402 | if (!ret) { | |
403 | cpu_set(cpu, smp_commenced_mask); | |
404 | while (!cpu_online(cpu)) | |
405 | mb(); | |
406 | } | |
407 | return ret; | |
1da177e4 LT |
408 | } |
409 | ||
410 | void smp_bogo(struct seq_file *m) | |
411 | { | |
412 | int i; | |
413 | ||
394e3902 AM |
414 | for_each_online_cpu(i) { |
415 | seq_printf(m, | |
416 | "Cpu%dBogo\t: %lu.%02lu\n", | |
417 | i, | |
418 | cpu_data(i).udelay_val/(500000/HZ), | |
419 | (cpu_data(i).udelay_val/(5000/HZ))%100); | |
1da177e4 LT |
420 | } |
421 | } | |
422 | ||
423 | void smp_info(struct seq_file *m) | |
424 | { | |
425 | int i; | |
426 | ||
427 | seq_printf(m, "State:\n"); | |
394e3902 AM |
428 | for_each_online_cpu(i) |
429 | seq_printf(m, "CPU%d\t\t: online\n", i); | |
1da177e4 | 430 | } |