kernel/cpu.c: create a CPU_STARTING cpu_chain notifier
[linux-2.6.git] / arch / sparc / kernel / sun4d_smp.c
1 /* sun4d_smp.c: Sparc SS1000/SC2000 SMP support.
2  *
3  * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
4  *
5  * Based on sun4m's smp.c, which is:
6  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
7  */
8
9 #include <asm/head.h>
10
11 #include <linux/kernel.h>
12 #include <linux/sched.h>
13 #include <linux/threads.h>
14 #include <linux/smp.h>
15 #include <linux/interrupt.h>
16 #include <linux/kernel_stat.h>
17 #include <linux/init.h>
18 #include <linux/spinlock.h>
19 #include <linux/mm.h>
20 #include <linux/swap.h>
21 #include <linux/profile.h>
22 #include <linux/delay.h>
23
24 #include <asm/ptrace.h>
25 #include <asm/atomic.h>
26 #include <asm/irq_regs.h>
27
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/sbus.h>
34 #include <asm/sbi.h>
35 #include <asm/tlbflush.h>
36 #include <asm/cacheflush.h>
37 #include <asm/cpudata.h>
38
39 #include "irq.h"
40 #define IRQ_CROSS_CALL          15
41
42 extern ctxd_t *srmmu_ctx_table_phys;
43
44 static volatile int smp_processors_ready = 0;
45 static int smp_highest_cpu;
46 extern volatile unsigned long cpu_callin_map[NR_CPUS];
47 extern cpuinfo_sparc cpu_data[NR_CPUS];
48 extern unsigned char boot_cpu_id;
49 extern volatile int smp_process_available;
50
51 extern cpumask_t smp_commenced_mask;
52
53 extern int __smp4d_processor_id(void);
54
55 /* #define SMP_DEBUG */
56
57 #ifdef SMP_DEBUG
58 #define SMP_PRINTK(x)   printk x
59 #else
60 #define SMP_PRINTK(x)
61 #endif
62
63 static inline unsigned long swap(volatile unsigned long *ptr, unsigned long val)
64 {
65         __asm__ __volatile__("swap [%1], %0\n\t" :
66                              "=&r" (val), "=&r" (ptr) :
67                              "0" (val), "1" (ptr));
68         return val;
69 }
70
71 static void smp_setup_percpu_timer(void);
72 extern void cpu_probe(void);
73 extern void sun4d_distribute_irqs(void);
74
75 void __init smp4d_callin(void)
76 {
77         int cpuid = hard_smp4d_processor_id();
78         extern spinlock_t sun4d_imsk_lock;
79         unsigned long flags;
80         
81         /* Show we are alive */
82         cpu_leds[cpuid] = 0x6;
83         show_leds(cpuid);
84
85         /* Enable level15 interrupt, disable level14 interrupt for now */
86         cc_set_imsk((cc_get_imsk() & ~0x8000) | 0x4000);
87
88         local_flush_cache_all();
89         local_flush_tlb_all();
90
91         notify_cpu_starting(cpuid);
92         /*
93          * Unblock the master CPU _only_ when the scheduler state
94          * of all secondary CPUs will be up-to-date, so after
95          * the SMP initialization the master will be just allowed
96          * to call the scheduler code.
97          */
98         /* Get our local ticker going. */
99         smp_setup_percpu_timer();
100
101         calibrate_delay();
102         smp_store_cpu_info(cpuid);
103         local_flush_cache_all();
104         local_flush_tlb_all();
105
106         /* Allow master to continue. */
107         swap((unsigned long *)&cpu_callin_map[cpuid], 1);
108         local_flush_cache_all();
109         local_flush_tlb_all();
110         
111         cpu_probe();
112
113         while((unsigned long)current_set[cpuid] < PAGE_OFFSET)
114                 barrier();
115                 
116         while(current_set[cpuid]->cpu != cpuid)
117                 barrier();
118                 
119         /* Fix idle thread fields. */
120         __asm__ __volatile__("ld [%0], %%g6\n\t"
121                              : : "r" (&current_set[cpuid])
122                              : "memory" /* paranoid */);
123
124         cpu_leds[cpuid] = 0x9;
125         show_leds(cpuid);
126         
127         /* Attach to the address space of init_task. */
128         atomic_inc(&init_mm.mm_count);
129         current->active_mm = &init_mm;
130
131         local_flush_cache_all();
132         local_flush_tlb_all();
133         
134         local_irq_enable();     /* We don't allow PIL 14 yet */
135         
136         while (!cpu_isset(cpuid, smp_commenced_mask))
137                 barrier();
138
139         spin_lock_irqsave(&sun4d_imsk_lock, flags);
140         cc_set_imsk(cc_get_imsk() & ~0x4000); /* Allow PIL 14 as well */
141         spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
142         cpu_set(cpuid, cpu_online_map);
143
144 }
145
146 extern void init_IRQ(void);
147 extern void cpu_panic(void);
148
149 /*
150  *      Cycle through the processors asking the PROM to start each one.
151  */
152  
153 extern struct linux_prom_registers smp_penguin_ctable;
154 extern unsigned long trapbase_cpu1[];
155 extern unsigned long trapbase_cpu2[];
156 extern unsigned long trapbase_cpu3[];
157
158 void __init smp4d_boot_cpus(void)
159 {
160         if (boot_cpu_id)
161                 current_set[0] = NULL;
162         smp_setup_percpu_timer();
163         local_flush_cache_all();
164 }
165
166 int __cpuinit smp4d_boot_one_cpu(int i)
167 {
168                         extern unsigned long sun4d_cpu_startup;
169                         unsigned long *entry = &sun4d_cpu_startup;
170                         struct task_struct *p;
171                         int timeout;
172                         int cpu_node;
173
174                         cpu_find_by_instance(i, &cpu_node,NULL);
175                         /* Cook up an idler for this guy. */
176                         p = fork_idle(i);
177                         current_set[i] = task_thread_info(p);
178
179                         /*
180                          * Initialize the contexts table
181                          * Since the call to prom_startcpu() trashes the structure,
182                          * we need to re-initialize it for each cpu
183                          */
184                         smp_penguin_ctable.which_io = 0;
185                         smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
186                         smp_penguin_ctable.reg_size = 0;
187
188                         /* whirrr, whirrr, whirrrrrrrrr... */
189                         SMP_PRINTK(("Starting CPU %d at %p \n", i, entry));
190                         local_flush_cache_all();
191                         prom_startcpu(cpu_node,
192                                       &smp_penguin_ctable, 0, (char *)entry);
193                                       
194                         SMP_PRINTK(("prom_startcpu returned :)\n"));
195
196                         /* wheee... it's going... */
197                         for(timeout = 0; timeout < 10000; timeout++) {
198                                 if(cpu_callin_map[i])
199                                         break;
200                                 udelay(200);
201                         }
202                         
203         if (!(cpu_callin_map[i])) {
204                 printk("Processor %d is stuck.\n", i);
205                 return -ENODEV;
206
207         }
208         local_flush_cache_all();
209         return 0;
210 }
211
212 void __init smp4d_smp_done(void)
213 {
214         int i, first;
215         int *prev;
216
217         /* setup cpu list for irq rotation */
218         first = 0;
219         prev = &first;
220         for (i = 0; i < NR_CPUS; i++)
221                 if (cpu_online(i)) {
222                         *prev = i;
223                         prev = &cpu_data(i).next;
224                 }
225         *prev = first;
226         local_flush_cache_all();
227
228         /* Free unneeded trap tables */
229         ClearPageReserved(virt_to_page(trapbase_cpu1));
230         init_page_count(virt_to_page(trapbase_cpu1));
231         free_page((unsigned long)trapbase_cpu1);
232         totalram_pages++;
233         num_physpages++;
234
235         ClearPageReserved(virt_to_page(trapbase_cpu2));
236         init_page_count(virt_to_page(trapbase_cpu2));
237         free_page((unsigned long)trapbase_cpu2);
238         totalram_pages++;
239         num_physpages++;
240
241         ClearPageReserved(virt_to_page(trapbase_cpu3));
242         init_page_count(virt_to_page(trapbase_cpu3));
243         free_page((unsigned long)trapbase_cpu3);
244         totalram_pages++;
245         num_physpages++;
246
247         /* Ok, they are spinning and ready to go. */
248         smp_processors_ready = 1;
249         sun4d_distribute_irqs();
250 }
251
252 static struct smp_funcall {
253         smpfunc_t func;
254         unsigned long arg1;
255         unsigned long arg2;
256         unsigned long arg3;
257         unsigned long arg4;
258         unsigned long arg5;
259         unsigned char processors_in[NR_CPUS];  /* Set when ipi entered. */
260         unsigned char processors_out[NR_CPUS]; /* Set when ipi exited. */
261 } ccall_info __attribute__((aligned(8)));
262
263 static DEFINE_SPINLOCK(cross_call_lock);
264
265 /* Cross calls must be serialized, at least currently. */
266 static void smp4d_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
267                              unsigned long arg2, unsigned long arg3,
268                              unsigned long arg4)
269 {
270         if(smp_processors_ready) {
271                 register int high = smp_highest_cpu;
272                 unsigned long flags;
273
274                 spin_lock_irqsave(&cross_call_lock, flags);
275
276                 {
277                         /* If you make changes here, make sure gcc generates proper code... */
278                         register smpfunc_t f asm("i0") = func;
279                         register unsigned long a1 asm("i1") = arg1;
280                         register unsigned long a2 asm("i2") = arg2;
281                         register unsigned long a3 asm("i3") = arg3;
282                         register unsigned long a4 asm("i4") = arg4;
283                         register unsigned long a5 asm("i5") = 0;
284
285                         __asm__ __volatile__(
286                                 "std %0, [%6]\n\t"
287                                 "std %2, [%6 + 8]\n\t"
288                                 "std %4, [%6 + 16]\n\t" : :
289                                 "r"(f), "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5),
290                                 "r" (&ccall_info.func));
291                 }
292
293                 /* Init receive/complete mapping, plus fire the IPI's off. */
294                 {
295                         register int i;
296
297                         cpu_clear(smp_processor_id(), mask);
298                         cpus_and(mask, cpu_online_map, mask);
299                         for(i = 0; i <= high; i++) {
300                                 if (cpu_isset(i, mask)) {
301                                         ccall_info.processors_in[i] = 0;
302                                         ccall_info.processors_out[i] = 0;
303                                         sun4d_send_ipi(i, IRQ_CROSS_CALL);
304                                 }
305                         }
306                 }
307
308                 {
309                         register int i;
310
311                         i = 0;
312                         do {
313                                 if (!cpu_isset(i, mask))
314                                         continue;
315                                 while(!ccall_info.processors_in[i])
316                                         barrier();
317                         } while(++i <= high);
318
319                         i = 0;
320                         do {
321                                 if (!cpu_isset(i, mask))
322                                         continue;
323                                 while(!ccall_info.processors_out[i])
324                                         barrier();
325                         } while(++i <= high);
326                 }
327
328                 spin_unlock_irqrestore(&cross_call_lock, flags);
329         }
330 }
331
332 /* Running cross calls. */
333 void smp4d_cross_call_irq(void)
334 {
335         int i = hard_smp4d_processor_id();
336
337         ccall_info.processors_in[i] = 1;
338         ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
339                         ccall_info.arg4, ccall_info.arg5);
340         ccall_info.processors_out[i] = 1;
341 }
342
343 void smp4d_percpu_timer_interrupt(struct pt_regs *regs)
344 {
345         struct pt_regs *old_regs;
346         int cpu = hard_smp4d_processor_id();
347         static int cpu_tick[NR_CPUS];
348         static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd };
349
350         old_regs = set_irq_regs(regs);
351         bw_get_prof_limit(cpu); 
352         bw_clear_intr_mask(0, 1);       /* INTR_TABLE[0] & 1 is Profile IRQ */
353
354         cpu_tick[cpu]++;
355         if (!(cpu_tick[cpu] & 15)) {
356                 if (cpu_tick[cpu] == 0x60)
357                         cpu_tick[cpu] = 0;
358                 cpu_leds[cpu] = led_mask[cpu_tick[cpu] >> 4];
359                 show_leds(cpu);
360         }
361
362         profile_tick(CPU_PROFILING);
363
364         if(!--prof_counter(cpu)) {
365                 int user = user_mode(regs);
366
367                 irq_enter();
368                 update_process_times(user);
369                 irq_exit();
370
371                 prof_counter(cpu) = prof_multiplier(cpu);
372         }
373         set_irq_regs(old_regs);
374 }
375
376 extern unsigned int lvl14_resolution;
377
378 static void __init smp_setup_percpu_timer(void)
379 {
380         int cpu = hard_smp4d_processor_id();
381
382         prof_counter(cpu) = prof_multiplier(cpu) = 1;
383         load_profile_irq(cpu, lvl14_resolution);
384 }
385
386 void __init smp4d_blackbox_id(unsigned *addr)
387 {
388         int rd = *addr & 0x3e000000;
389         
390         addr[0] = 0xc0800800 | rd;              /* lda [%g0] ASI_M_VIKING_TMP1, reg */
391         addr[1] = 0x01000000;                   /* nop */
392         addr[2] = 0x01000000;                   /* nop */
393 }
394
395 void __init smp4d_blackbox_current(unsigned *addr)
396 {
397         int rd = *addr & 0x3e000000;
398         
399         addr[0] = 0xc0800800 | rd;              /* lda [%g0] ASI_M_VIKING_TMP1, reg */
400         addr[2] = 0x81282002 | rd | (rd >> 11); /* sll reg, 2, reg */
401         addr[4] = 0x01000000;                   /* nop */
402 }
403
404 void __init sun4d_init_smp(void)
405 {
406         int i;
407         extern unsigned int t_nmi[], linux_trap_ipi15_sun4d[], linux_trap_ipi15_sun4m[];
408
409         /* Patch ipi15 trap table */
410         t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m);
411         
412         /* And set btfixup... */
413         BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4d_blackbox_id);
414         BTFIXUPSET_BLACKBOX(load_current, smp4d_blackbox_current);
415         BTFIXUPSET_CALL(smp_cross_call, smp4d_cross_call, BTFIXUPCALL_NORM);
416         BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4d_processor_id, BTFIXUPCALL_NORM);
417         
418         for (i = 0; i < NR_CPUS; i++) {
419                 ccall_info.processors_in[i] = 1;
420                 ccall_info.processors_out[i] = 1;
421         }
422 }