Commit | Line | Data |
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1da177e4 LT |
1 | /* sun4m_smp.c: Sparc SUN4M SMP support. |
2 | * | |
3 | * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) | |
4 | */ | |
5 | ||
6 | #include <asm/head.h> | |
7 | ||
8 | #include <linux/kernel.h> | |
9 | #include <linux/sched.h> | |
10 | #include <linux/threads.h> | |
11 | #include <linux/smp.h> | |
1da177e4 LT |
12 | #include <linux/interrupt.h> |
13 | #include <linux/kernel_stat.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/spinlock.h> | |
16 | #include <linux/mm.h> | |
17 | #include <linux/swap.h> | |
18 | #include <linux/profile.h> | |
6c81c32f AB |
19 | #include <linux/delay.h> |
20 | ||
1da177e4 LT |
21 | #include <asm/cacheflush.h> |
22 | #include <asm/tlbflush.h> | |
0d84438d | 23 | #include <asm/irq_regs.h> |
1da177e4 LT |
24 | |
25 | #include <asm/ptrace.h> | |
26 | #include <asm/atomic.h> | |
27 | ||
1da177e4 LT |
28 | #include <asm/irq.h> |
29 | #include <asm/page.h> | |
30 | #include <asm/pgalloc.h> | |
31 | #include <asm/pgtable.h> | |
32 | #include <asm/oplib.h> | |
33 | #include <asm/cpudata.h> | |
34 | ||
32231a66 AV |
35 | #include "irq.h" |
36 | ||
1da177e4 LT |
37 | #define IRQ_CROSS_CALL 15 |
38 | ||
39 | extern ctxd_t *srmmu_ctx_table_phys; | |
40 | ||
1da177e4 LT |
41 | extern volatile unsigned long cpu_callin_map[NR_CPUS]; |
42 | extern unsigned char boot_cpu_id; | |
a54123e2 BB |
43 | |
44 | extern cpumask_t smp_commenced_mask; | |
45 | ||
1da177e4 LT |
46 | extern int __smp4m_processor_id(void); |
47 | ||
48 | /*#define SMP_DEBUG*/ | |
49 | ||
50 | #ifdef SMP_DEBUG | |
51 | #define SMP_PRINTK(x) printk x | |
52 | #else | |
53 | #define SMP_PRINTK(x) | |
54 | #endif | |
55 | ||
56 | static inline unsigned long swap(volatile unsigned long *ptr, unsigned long val) | |
57 | { | |
58 | __asm__ __volatile__("swap [%1], %0\n\t" : | |
59 | "=&r" (val), "=&r" (ptr) : | |
60 | "0" (val), "1" (ptr)); | |
61 | return val; | |
62 | } | |
63 | ||
64 | static void smp_setup_percpu_timer(void); | |
65 | extern void cpu_probe(void); | |
66 | ||
92d452f0 | 67 | void __cpuinit smp4m_callin(void) |
1da177e4 LT |
68 | { |
69 | int cpuid = hard_smp_processor_id(); | |
70 | ||
71 | local_flush_cache_all(); | |
72 | local_flush_tlb_all(); | |
73 | ||
1da177e4 LT |
74 | /* Get our local ticker going. */ |
75 | smp_setup_percpu_timer(); | |
76 | ||
77 | calibrate_delay(); | |
78 | smp_store_cpu_info(cpuid); | |
79 | ||
80 | local_flush_cache_all(); | |
81 | local_flush_tlb_all(); | |
82 | ||
83 | /* | |
84 | * Unblock the master CPU _only_ when the scheduler state | |
85 | * of all secondary CPUs will be up-to-date, so after | |
86 | * the SMP initialization the master will be just allowed | |
87 | * to call the scheduler code. | |
88 | */ | |
89 | /* Allow master to continue. */ | |
a54123e2 | 90 | swap(&cpu_callin_map[cpuid], 1); |
1da177e4 | 91 | |
a54123e2 | 92 | /* XXX: What's up with all the flushes? */ |
1da177e4 LT |
93 | local_flush_cache_all(); |
94 | local_flush_tlb_all(); | |
95 | ||
96 | cpu_probe(); | |
97 | ||
98 | /* Fix idle thread fields. */ | |
99 | __asm__ __volatile__("ld [%0], %%g6\n\t" | |
100 | : : "r" (¤t_set[cpuid]) | |
101 | : "memory" /* paranoid */); | |
102 | ||
103 | /* Attach to the address space of init_task. */ | |
104 | atomic_inc(&init_mm.mm_count); | |
105 | current->active_mm = &init_mm; | |
106 | ||
a54123e2 BB |
107 | while (!cpu_isset(cpuid, smp_commenced_mask)) |
108 | mb(); | |
1da177e4 LT |
109 | |
110 | local_irq_enable(); | |
a54123e2 BB |
111 | |
112 | cpu_set(cpuid, cpu_online_map); | |
1da177e4 LT |
113 | } |
114 | ||
1da177e4 LT |
115 | /* |
116 | * Cycle through the processors asking the PROM to start each one. | |
117 | */ | |
118 | ||
119 | extern struct linux_prom_registers smp_penguin_ctable; | |
120 | extern unsigned long trapbase_cpu1[]; | |
121 | extern unsigned long trapbase_cpu2[]; | |
122 | extern unsigned long trapbase_cpu3[]; | |
123 | ||
124 | void __init smp4m_boot_cpus(void) | |
125 | { | |
a54123e2 BB |
126 | smp_setup_percpu_timer(); |
127 | local_flush_cache_all(); | |
128 | } | |
1da177e4 | 129 | |
92d452f0 | 130 | int __cpuinit smp4m_boot_one_cpu(int i) |
a54123e2 BB |
131 | { |
132 | extern unsigned long sun4m_cpu_startup; | |
133 | unsigned long *entry = &sun4m_cpu_startup; | |
134 | struct task_struct *p; | |
135 | int timeout; | |
136 | int cpu_node; | |
1da177e4 | 137 | |
a54123e2 BB |
138 | cpu_find_by_mid(i, &cpu_node); |
139 | ||
140 | /* Cook up an idler for this guy. */ | |
141 | p = fork_idle(i); | |
142 | current_set[i] = task_thread_info(p); | |
143 | /* See trampoline.S for details... */ | |
144 | entry += ((i-1) * 3); | |
1da177e4 | 145 | |
a54123e2 BB |
146 | /* |
147 | * Initialize the contexts table | |
148 | * Since the call to prom_startcpu() trashes the structure, | |
149 | * we need to re-initialize it for each cpu | |
150 | */ | |
151 | smp_penguin_ctable.which_io = 0; | |
152 | smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys; | |
153 | smp_penguin_ctable.reg_size = 0; | |
1da177e4 | 154 | |
a54123e2 BB |
155 | /* whirrr, whirrr, whirrrrrrrrr... */ |
156 | printk("Starting CPU %d at %p\n", i, entry); | |
157 | local_flush_cache_all(); | |
158 | prom_startcpu(cpu_node, | |
159 | &smp_penguin_ctable, 0, (char *)entry); | |
160 | ||
161 | /* wheee... it's going... */ | |
162 | for(timeout = 0; timeout < 10000; timeout++) { | |
163 | if(cpu_callin_map[i]) | |
164 | break; | |
165 | udelay(200); | |
1da177e4 LT |
166 | } |
167 | ||
a54123e2 BB |
168 | if (!(cpu_callin_map[i])) { |
169 | printk("Processor %d is stuck.\n", i); | |
170 | return -ENODEV; | |
171 | } | |
1da177e4 | 172 | |
1da177e4 | 173 | local_flush_cache_all(); |
a54123e2 BB |
174 | return 0; |
175 | } | |
176 | ||
177 | void __init smp4m_smp_done(void) | |
178 | { | |
179 | int i, first; | |
180 | int *prev; | |
181 | ||
182 | /* setup cpu list for irq rotation */ | |
183 | first = 0; | |
184 | prev = &first; | |
185 | for (i = 0; i < NR_CPUS; i++) { | |
186 | if (cpu_online(i)) { | |
187 | *prev = i; | |
188 | prev = &cpu_data(i).next; | |
1da177e4 LT |
189 | } |
190 | } | |
a54123e2 | 191 | *prev = first; |
1da177e4 | 192 | local_flush_cache_all(); |
1da177e4 LT |
193 | |
194 | /* Free unneeded trap tables */ | |
a54123e2 | 195 | if (!cpu_isset(1, cpu_present_map)) { |
1da177e4 | 196 | ClearPageReserved(virt_to_page(trapbase_cpu1)); |
7835e98b | 197 | init_page_count(virt_to_page(trapbase_cpu1)); |
1da177e4 LT |
198 | free_page((unsigned long)trapbase_cpu1); |
199 | totalram_pages++; | |
200 | num_physpages++; | |
201 | } | |
202 | if (!cpu_isset(2, cpu_present_map)) { | |
203 | ClearPageReserved(virt_to_page(trapbase_cpu2)); | |
7835e98b | 204 | init_page_count(virt_to_page(trapbase_cpu2)); |
1da177e4 LT |
205 | free_page((unsigned long)trapbase_cpu2); |
206 | totalram_pages++; | |
207 | num_physpages++; | |
208 | } | |
209 | if (!cpu_isset(3, cpu_present_map)) { | |
210 | ClearPageReserved(virt_to_page(trapbase_cpu3)); | |
7835e98b | 211 | init_page_count(virt_to_page(trapbase_cpu3)); |
1da177e4 LT |
212 | free_page((unsigned long)trapbase_cpu3); |
213 | totalram_pages++; | |
214 | num_physpages++; | |
215 | } | |
216 | ||
217 | /* Ok, they are spinning and ready to go. */ | |
1da177e4 LT |
218 | } |
219 | ||
220 | /* At each hardware IRQ, we get this called to forward IRQ reception | |
221 | * to the next processor. The caller must disable the IRQ level being | |
222 | * serviced globally so that there are no double interrupts received. | |
223 | * | |
224 | * XXX See sparc64 irq.c. | |
225 | */ | |
226 | void smp4m_irq_rotate(int cpu) | |
227 | { | |
a54123e2 BB |
228 | int next = cpu_data(cpu).next; |
229 | if (next != cpu) | |
230 | set_irq_udt(next); | |
1da177e4 LT |
231 | } |
232 | ||
1da177e4 LT |
233 | static struct smp_funcall { |
234 | smpfunc_t func; | |
235 | unsigned long arg1; | |
236 | unsigned long arg2; | |
237 | unsigned long arg3; | |
238 | unsigned long arg4; | |
239 | unsigned long arg5; | |
a54123e2 BB |
240 | unsigned long processors_in[SUN4M_NCPUS]; /* Set when ipi entered. */ |
241 | unsigned long processors_out[SUN4M_NCPUS]; /* Set when ipi exited. */ | |
1da177e4 LT |
242 | } ccall_info; |
243 | ||
244 | static DEFINE_SPINLOCK(cross_call_lock); | |
245 | ||
246 | /* Cross calls must be serialized, at least currently. */ | |
c61c65cd AB |
247 | static void smp4m_cross_call(smpfunc_t func, unsigned long arg1, |
248 | unsigned long arg2, unsigned long arg3, | |
249 | unsigned long arg4, unsigned long arg5) | |
1da177e4 | 250 | { |
a54123e2 | 251 | register int ncpus = SUN4M_NCPUS; |
1da177e4 LT |
252 | unsigned long flags; |
253 | ||
254 | spin_lock_irqsave(&cross_call_lock, flags); | |
255 | ||
256 | /* Init function glue. */ | |
257 | ccall_info.func = func; | |
258 | ccall_info.arg1 = arg1; | |
259 | ccall_info.arg2 = arg2; | |
260 | ccall_info.arg3 = arg3; | |
261 | ccall_info.arg4 = arg4; | |
262 | ccall_info.arg5 = arg5; | |
263 | ||
264 | /* Init receive/complete mapping, plus fire the IPI's off. */ | |
265 | { | |
a54123e2 | 266 | cpumask_t mask = cpu_online_map; |
1da177e4 LT |
267 | register int i; |
268 | ||
269 | cpu_clear(smp_processor_id(), mask); | |
270 | for(i = 0; i < ncpus; i++) { | |
271 | if (cpu_isset(i, mask)) { | |
272 | ccall_info.processors_in[i] = 0; | |
273 | ccall_info.processors_out[i] = 0; | |
274 | set_cpu_int(i, IRQ_CROSS_CALL); | |
275 | } else { | |
276 | ccall_info.processors_in[i] = 1; | |
277 | ccall_info.processors_out[i] = 1; | |
278 | } | |
279 | } | |
280 | } | |
281 | ||
282 | { | |
283 | register int i; | |
284 | ||
285 | i = 0; | |
286 | do { | |
287 | while(!ccall_info.processors_in[i]) | |
288 | barrier(); | |
289 | } while(++i < ncpus); | |
290 | ||
291 | i = 0; | |
292 | do { | |
293 | while(!ccall_info.processors_out[i]) | |
294 | barrier(); | |
295 | } while(++i < ncpus); | |
296 | } | |
297 | ||
298 | spin_unlock_irqrestore(&cross_call_lock, flags); | |
1da177e4 LT |
299 | } |
300 | ||
301 | /* Running cross calls. */ | |
302 | void smp4m_cross_call_irq(void) | |
303 | { | |
304 | int i = smp_processor_id(); | |
305 | ||
306 | ccall_info.processors_in[i] = 1; | |
307 | ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3, | |
308 | ccall_info.arg4, ccall_info.arg5); | |
309 | ccall_info.processors_out[i] = 1; | |
310 | } | |
311 | ||
312 | void smp4m_percpu_timer_interrupt(struct pt_regs *regs) | |
313 | { | |
0d84438d | 314 | struct pt_regs *old_regs; |
1da177e4 LT |
315 | int cpu = smp_processor_id(); |
316 | ||
0d84438d AV |
317 | old_regs = set_irq_regs(regs); |
318 | ||
1da177e4 LT |
319 | clear_profile_irq(cpu); |
320 | ||
0d84438d | 321 | profile_tick(CPU_PROFILING); |
1da177e4 LT |
322 | |
323 | if(!--prof_counter(cpu)) { | |
324 | int user = user_mode(regs); | |
325 | ||
326 | irq_enter(); | |
327 | update_process_times(user); | |
328 | irq_exit(); | |
329 | ||
330 | prof_counter(cpu) = prof_multiplier(cpu); | |
331 | } | |
0d84438d | 332 | set_irq_regs(old_regs); |
1da177e4 LT |
333 | } |
334 | ||
335 | extern unsigned int lvl14_resolution; | |
336 | ||
337 | static void __init smp_setup_percpu_timer(void) | |
338 | { | |
339 | int cpu = smp_processor_id(); | |
340 | ||
341 | prof_counter(cpu) = prof_multiplier(cpu) = 1; | |
342 | load_profile_irq(cpu, lvl14_resolution); | |
343 | ||
344 | if(cpu == boot_cpu_id) | |
345 | enable_pil_irq(14); | |
346 | } | |
347 | ||
c61c65cd | 348 | static void __init smp4m_blackbox_id(unsigned *addr) |
1da177e4 LT |
349 | { |
350 | int rd = *addr & 0x3e000000; | |
351 | int rs1 = rd >> 11; | |
352 | ||
353 | addr[0] = 0x81580000 | rd; /* rd %tbr, reg */ | |
354 | addr[1] = 0x8130200c | rd | rs1; /* srl reg, 0xc, reg */ | |
355 | addr[2] = 0x80082003 | rd | rs1; /* and reg, 3, reg */ | |
356 | } | |
357 | ||
c61c65cd | 358 | static void __init smp4m_blackbox_current(unsigned *addr) |
1da177e4 LT |
359 | { |
360 | int rd = *addr & 0x3e000000; | |
361 | int rs1 = rd >> 11; | |
362 | ||
363 | addr[0] = 0x81580000 | rd; /* rd %tbr, reg */ | |
364 | addr[2] = 0x8130200a | rd | rs1; /* srl reg, 0xa, reg */ | |
4cad6917 | 365 | addr[4] = 0x8008200c | rd | rs1; /* and reg, 0xc, reg */ |
1da177e4 LT |
366 | } |
367 | ||
368 | void __init sun4m_init_smp(void) | |
369 | { | |
370 | BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4m_blackbox_id); | |
371 | BTFIXUPSET_BLACKBOX(load_current, smp4m_blackbox_current); | |
372 | BTFIXUPSET_CALL(smp_cross_call, smp4m_cross_call, BTFIXUPCALL_NORM); | |
1da177e4 LT |
373 | BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4m_processor_id, BTFIXUPCALL_NORM); |
374 | } |