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 | ||
409832f5 | 38 | volatile unsigned long cpu_callin_map[NR_CPUS] __cpuinitdata = {0,}; |
1da177e4 LT |
39 | unsigned char boot_cpu_id = 0; |
40 | unsigned char boot_cpu_id4 = 0; /* boot_cpu_id << 2 */ | |
1da177e4 | 41 | |
a54123e2 | 42 | cpumask_t smp_commenced_mask = CPU_MASK_NONE; |
1da177e4 LT |
43 | |
44 | /* The only guaranteed locking primitive available on all Sparc | |
45 | * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically | |
46 | * places the current byte at the effective address into dest_reg and | |
47 | * places 0xff there afterwards. Pretty lame locking primitive | |
48 | * compared to the Alpha and the Intel no? Most Sparcs have 'swap' | |
49 | * instruction which is much better... | |
50 | */ | |
51 | ||
92d452f0 | 52 | void __cpuinit smp_store_cpu_info(int id) |
1da177e4 LT |
53 | { |
54 | int cpu_node; | |
55 | ||
56 | cpu_data(id).udelay_val = loops_per_jiffy; | |
57 | ||
58 | cpu_find_by_mid(id, &cpu_node); | |
59 | cpu_data(id).clock_tick = prom_getintdefault(cpu_node, | |
60 | "clock-frequency", 0); | |
61 | cpu_data(id).prom_node = cpu_node; | |
62 | cpu_data(id).mid = cpu_get_hwmid(cpu_node); | |
650fb838 | 63 | |
1da177e4 LT |
64 | if (cpu_data(id).mid < 0) |
65 | panic("No MID found for CPU%d at node 0x%08d", id, cpu_node); | |
66 | } | |
67 | ||
68 | void __init smp_cpus_done(unsigned int max_cpus) | |
69 | { | |
a54123e2 | 70 | extern void smp4m_smp_done(void); |
8b3c848c | 71 | extern void smp4d_smp_done(void); |
a54123e2 BB |
72 | unsigned long bogosum = 0; |
73 | int cpu, num; | |
74 | ||
75 | for (cpu = 0, num = 0; cpu < NR_CPUS; cpu++) | |
76 | if (cpu_online(cpu)) { | |
77 | num++; | |
78 | bogosum += cpu_data(cpu).udelay_val; | |
79 | } | |
80 | ||
81 | printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n", | |
82 | num, bogosum/(500000/HZ), | |
83 | (bogosum/(5000/HZ))%100); | |
84 | ||
8b3c848c RB |
85 | switch(sparc_cpu_model) { |
86 | case sun4: | |
87 | printk("SUN4\n"); | |
88 | BUG(); | |
89 | break; | |
90 | case sun4c: | |
91 | printk("SUN4C\n"); | |
92 | BUG(); | |
93 | break; | |
94 | case sun4m: | |
95 | smp4m_smp_done(); | |
96 | break; | |
97 | case sun4d: | |
98 | smp4d_smp_done(); | |
99 | break; | |
100 | case sun4e: | |
101 | printk("SUN4E\n"); | |
102 | BUG(); | |
103 | break; | |
104 | case sun4u: | |
105 | printk("SUN4U\n"); | |
106 | BUG(); | |
107 | break; | |
108 | default: | |
109 | printk("UNKNOWN!\n"); | |
110 | BUG(); | |
111 | break; | |
112 | }; | |
1da177e4 LT |
113 | } |
114 | ||
115 | void cpu_panic(void) | |
116 | { | |
117 | printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id()); | |
118 | panic("SMP bolixed\n"); | |
119 | } | |
120 | ||
409832f5 | 121 | struct linux_prom_registers smp_penguin_ctable __cpuinitdata = { 0 }; |
1da177e4 | 122 | |
1da177e4 LT |
123 | void smp_send_reschedule(int cpu) |
124 | { | |
125 | /* See sparc64 */ | |
126 | } | |
127 | ||
128 | void smp_send_stop(void) | |
129 | { | |
130 | } | |
131 | ||
132 | void smp_flush_cache_all(void) | |
133 | { | |
134 | xc0((smpfunc_t) BTFIXUP_CALL(local_flush_cache_all)); | |
135 | local_flush_cache_all(); | |
136 | } | |
137 | ||
138 | void smp_flush_tlb_all(void) | |
139 | { | |
140 | xc0((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_all)); | |
141 | local_flush_tlb_all(); | |
142 | } | |
143 | ||
144 | void smp_flush_cache_mm(struct mm_struct *mm) | |
145 | { | |
146 | if(mm->context != NO_CONTEXT) { | |
147 | cpumask_t cpu_mask = mm->cpu_vm_mask; | |
148 | cpu_clear(smp_processor_id(), cpu_mask); | |
149 | if (!cpus_empty(cpu_mask)) | |
150 | xc1((smpfunc_t) BTFIXUP_CALL(local_flush_cache_mm), (unsigned long) mm); | |
151 | local_flush_cache_mm(mm); | |
152 | } | |
153 | } | |
154 | ||
155 | void smp_flush_tlb_mm(struct mm_struct *mm) | |
156 | { | |
157 | if(mm->context != NO_CONTEXT) { | |
158 | cpumask_t cpu_mask = mm->cpu_vm_mask; | |
159 | cpu_clear(smp_processor_id(), cpu_mask); | |
160 | if (!cpus_empty(cpu_mask)) { | |
161 | xc1((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_mm), (unsigned long) mm); | |
162 | if(atomic_read(&mm->mm_users) == 1 && current->active_mm == mm) | |
163 | mm->cpu_vm_mask = cpumask_of_cpu(smp_processor_id()); | |
164 | } | |
165 | local_flush_tlb_mm(mm); | |
166 | } | |
167 | } | |
168 | ||
169 | void smp_flush_cache_range(struct vm_area_struct *vma, unsigned long start, | |
170 | unsigned long end) | |
171 | { | |
172 | struct mm_struct *mm = vma->vm_mm; | |
173 | ||
174 | if (mm->context != NO_CONTEXT) { | |
175 | cpumask_t cpu_mask = mm->cpu_vm_mask; | |
176 | cpu_clear(smp_processor_id(), cpu_mask); | |
177 | if (!cpus_empty(cpu_mask)) | |
178 | xc3((smpfunc_t) BTFIXUP_CALL(local_flush_cache_range), (unsigned long) vma, start, end); | |
179 | local_flush_cache_range(vma, start, end); | |
180 | } | |
181 | } | |
182 | ||
183 | void smp_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, | |
184 | unsigned long end) | |
185 | { | |
186 | struct mm_struct *mm = vma->vm_mm; | |
187 | ||
188 | if (mm->context != NO_CONTEXT) { | |
189 | cpumask_t cpu_mask = mm->cpu_vm_mask; | |
190 | cpu_clear(smp_processor_id(), cpu_mask); | |
191 | if (!cpus_empty(cpu_mask)) | |
192 | xc3((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_range), (unsigned long) vma, start, end); | |
193 | local_flush_tlb_range(vma, start, end); | |
194 | } | |
195 | } | |
196 | ||
197 | void smp_flush_cache_page(struct vm_area_struct *vma, unsigned long page) | |
198 | { | |
199 | struct mm_struct *mm = vma->vm_mm; | |
200 | ||
201 | if(mm->context != NO_CONTEXT) { | |
202 | cpumask_t cpu_mask = mm->cpu_vm_mask; | |
203 | cpu_clear(smp_processor_id(), cpu_mask); | |
204 | if (!cpus_empty(cpu_mask)) | |
205 | xc2((smpfunc_t) BTFIXUP_CALL(local_flush_cache_page), (unsigned long) vma, page); | |
206 | local_flush_cache_page(vma, page); | |
207 | } | |
208 | } | |
209 | ||
210 | void smp_flush_tlb_page(struct vm_area_struct *vma, unsigned long page) | |
211 | { | |
212 | struct mm_struct *mm = vma->vm_mm; | |
213 | ||
214 | if(mm->context != NO_CONTEXT) { | |
215 | cpumask_t cpu_mask = mm->cpu_vm_mask; | |
216 | cpu_clear(smp_processor_id(), cpu_mask); | |
217 | if (!cpus_empty(cpu_mask)) | |
218 | xc2((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_page), (unsigned long) vma, page); | |
219 | local_flush_tlb_page(vma, page); | |
220 | } | |
221 | } | |
222 | ||
223 | void smp_reschedule_irq(void) | |
224 | { | |
225 | set_need_resched(); | |
226 | } | |
227 | ||
228 | void smp_flush_page_to_ram(unsigned long page) | |
229 | { | |
230 | /* Current theory is that those who call this are the one's | |
231 | * who have just dirtied their cache with the pages contents | |
232 | * in kernel space, therefore we only run this on local cpu. | |
233 | * | |
234 | * XXX This experiment failed, research further... -DaveM | |
235 | */ | |
236 | #if 1 | |
237 | xc1((smpfunc_t) BTFIXUP_CALL(local_flush_page_to_ram), page); | |
238 | #endif | |
239 | local_flush_page_to_ram(page); | |
240 | } | |
241 | ||
242 | void smp_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr) | |
243 | { | |
244 | cpumask_t cpu_mask = mm->cpu_vm_mask; | |
245 | cpu_clear(smp_processor_id(), cpu_mask); | |
246 | if (!cpus_empty(cpu_mask)) | |
247 | xc2((smpfunc_t) BTFIXUP_CALL(local_flush_sig_insns), (unsigned long) mm, insn_addr); | |
248 | local_flush_sig_insns(mm, insn_addr); | |
249 | } | |
250 | ||
251 | extern unsigned int lvl14_resolution; | |
252 | ||
253 | /* /proc/profile writes can call this, don't __init it please. */ | |
254 | static DEFINE_SPINLOCK(prof_setup_lock); | |
255 | ||
256 | int setup_profiling_timer(unsigned int multiplier) | |
257 | { | |
258 | int i; | |
259 | unsigned long flags; | |
260 | ||
261 | /* Prevent level14 ticker IRQ flooding. */ | |
262 | if((!multiplier) || (lvl14_resolution / multiplier) < 500) | |
263 | return -EINVAL; | |
264 | ||
265 | spin_lock_irqsave(&prof_setup_lock, flags); | |
fff8efe7 | 266 | for_each_possible_cpu(i) { |
394e3902 | 267 | load_profile_irq(i, lvl14_resolution / multiplier); |
1da177e4 LT |
268 | prof_multiplier(i) = multiplier; |
269 | } | |
270 | spin_unlock_irqrestore(&prof_setup_lock, flags); | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
a54123e2 | 275 | void __init smp_prepare_cpus(unsigned int max_cpus) |
1da177e4 | 276 | { |
b4cff846 AV |
277 | extern void __init smp4m_boot_cpus(void); |
278 | extern void __init smp4d_boot_cpus(void); | |
7202fb49 | 279 | int i, cpuid, extra; |
a54123e2 | 280 | |
a54123e2 BB |
281 | printk("Entering SMP Mode...\n"); |
282 | ||
a54123e2 BB |
283 | extra = 0; |
284 | for (i = 0; !cpu_find_by_instance(i, NULL, &cpuid); i++) { | |
7202fb49 | 285 | if (cpuid >= NR_CPUS) |
a54123e2 BB |
286 | extra++; |
287 | } | |
7202fb49 BB |
288 | /* i = number of cpus */ |
289 | if (extra && max_cpus > i - extra) | |
a54123e2 BB |
290 | printk("Warning: NR_CPUS is too low to start all cpus\n"); |
291 | ||
292 | smp_store_cpu_info(boot_cpu_id); | |
293 | ||
8b3c848c RB |
294 | switch(sparc_cpu_model) { |
295 | case sun4: | |
296 | printk("SUN4\n"); | |
297 | BUG(); | |
298 | break; | |
299 | case sun4c: | |
300 | printk("SUN4C\n"); | |
301 | BUG(); | |
302 | break; | |
303 | case sun4m: | |
304 | smp4m_boot_cpus(); | |
305 | break; | |
306 | case sun4d: | |
307 | smp4d_boot_cpus(); | |
308 | break; | |
309 | case sun4e: | |
310 | printk("SUN4E\n"); | |
311 | BUG(); | |
312 | break; | |
313 | case sun4u: | |
314 | printk("SUN4U\n"); | |
315 | BUG(); | |
316 | break; | |
317 | default: | |
318 | printk("UNKNOWN!\n"); | |
319 | BUG(); | |
320 | break; | |
321 | }; | |
1da177e4 LT |
322 | } |
323 | ||
7202fb49 BB |
324 | /* Set this up early so that things like the scheduler can init |
325 | * properly. We use the same cpu mask for both the present and | |
326 | * possible cpu map. | |
327 | */ | |
328 | void __init smp_setup_cpu_possible_map(void) | |
329 | { | |
330 | int instance, mid; | |
331 | ||
332 | instance = 0; | |
333 | while (!cpu_find_by_instance(instance, NULL, &mid)) { | |
334 | if (mid < NR_CPUS) { | |
98a79d6a | 335 | cpu_set(mid, cpu_possible_map); |
7202fb49 BB |
336 | cpu_set(mid, cpu_present_map); |
337 | } | |
338 | instance++; | |
339 | } | |
340 | } | |
341 | ||
92d452f0 | 342 | void __init smp_prepare_boot_cpu(void) |
1da177e4 | 343 | { |
a54123e2 BB |
344 | int cpuid = hard_smp_processor_id(); |
345 | ||
346 | if (cpuid >= NR_CPUS) { | |
347 | prom_printf("Serious problem, boot cpu id >= NR_CPUS\n"); | |
348 | prom_halt(); | |
349 | } | |
350 | if (cpuid != 0) | |
351 | printk("boot cpu id != 0, this could work but is untested\n"); | |
352 | ||
353 | current_thread_info()->cpu = cpuid; | |
354 | cpu_set(cpuid, cpu_online_map); | |
98a79d6a | 355 | cpu_set(cpuid, cpu_possible_map); |
1da177e4 LT |
356 | } |
357 | ||
92d452f0 | 358 | int __cpuinit __cpu_up(unsigned int cpu) |
1da177e4 | 359 | { |
b4cff846 AV |
360 | extern int __cpuinit smp4m_boot_one_cpu(int); |
361 | extern int __cpuinit smp4d_boot_one_cpu(int); | |
8b3c848c RB |
362 | int ret=0; |
363 | ||
364 | switch(sparc_cpu_model) { | |
365 | case sun4: | |
366 | printk("SUN4\n"); | |
367 | BUG(); | |
368 | break; | |
369 | case sun4c: | |
370 | printk("SUN4C\n"); | |
371 | BUG(); | |
372 | break; | |
373 | case sun4m: | |
374 | ret = smp4m_boot_one_cpu(cpu); | |
375 | break; | |
376 | case sun4d: | |
377 | ret = smp4d_boot_one_cpu(cpu); | |
378 | break; | |
379 | case sun4e: | |
380 | printk("SUN4E\n"); | |
381 | BUG(); | |
382 | break; | |
383 | case sun4u: | |
384 | printk("SUN4U\n"); | |
385 | BUG(); | |
386 | break; | |
387 | default: | |
388 | printk("UNKNOWN!\n"); | |
389 | BUG(); | |
390 | break; | |
391 | }; | |
a54123e2 BB |
392 | |
393 | if (!ret) { | |
394 | cpu_set(cpu, smp_commenced_mask); | |
395 | while (!cpu_online(cpu)) | |
396 | mb(); | |
397 | } | |
398 | return ret; | |
1da177e4 LT |
399 | } |
400 | ||
401 | void smp_bogo(struct seq_file *m) | |
402 | { | |
403 | int i; | |
404 | ||
394e3902 AM |
405 | for_each_online_cpu(i) { |
406 | seq_printf(m, | |
407 | "Cpu%dBogo\t: %lu.%02lu\n", | |
408 | i, | |
409 | cpu_data(i).udelay_val/(500000/HZ), | |
410 | (cpu_data(i).udelay_val/(5000/HZ))%100); | |
1da177e4 LT |
411 | } |
412 | } | |
413 | ||
414 | void smp_info(struct seq_file *m) | |
415 | { | |
416 | int i; | |
417 | ||
418 | seq_printf(m, "State:\n"); | |
394e3902 AM |
419 | for_each_online_cpu(i) |
420 | seq_printf(m, "CPU%d\t\t: online\n", i); | |
1da177e4 | 421 | } |