Merge branch 'master' of /pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6] / 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         /*
92          * Unblock the master CPU _only_ when the scheduler state
93          * of all secondary CPUs will be up-to-date, so after
94          * the SMP initialization the master will be just allowed
95          * to call the scheduler code.
96          */
97         /* Get our local ticker going. */
98         smp_setup_percpu_timer();
99
100         calibrate_delay();
101         smp_store_cpu_info(cpuid);
102         local_flush_cache_all();
103         local_flush_tlb_all();
104
105         /* Allow master to continue. */
106         swap((unsigned long *)&cpu_callin_map[cpuid], 1);
107         local_flush_cache_all();
108         local_flush_tlb_all();
109         
110         cpu_probe();
111
112         while((unsigned long)current_set[cpuid] < PAGE_OFFSET)
113                 barrier();
114                 
115         while(current_set[cpuid]->cpu != cpuid)
116                 barrier();
117                 
118         /* Fix idle thread fields. */
119         __asm__ __volatile__("ld [%0], %%g6\n\t"
120                              : : "r" (&current_set[cpuid])
121                              : "memory" /* paranoid */);
122
123         cpu_leds[cpuid] = 0x9;
124         show_leds(cpuid);
125         
126         /* Attach to the address space of init_task. */
127         atomic_inc(&init_mm.mm_count);
128         current->active_mm = &init_mm;
129
130         local_flush_cache_all();
131         local_flush_tlb_all();
132         
133         local_irq_enable();     /* We don't allow PIL 14 yet */
134         
135         while (!cpu_isset(cpuid, smp_commenced_mask))
136                 barrier();
137
138         spin_lock_irqsave(&sun4d_imsk_lock, flags);
139         cc_set_imsk(cc_get_imsk() & ~0x4000); /* Allow PIL 14 as well */
140         spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
141         cpu_set(cpuid, cpu_online_map);
142
143 }
144
145 extern void init_IRQ(void);
146 extern void cpu_panic(void);
147
148 /*
149  *      Cycle through the processors asking the PROM to start each one.
150  */
151  
152 extern struct linux_prom_registers smp_penguin_ctable;
153 extern unsigned long trapbase_cpu1[];
154 extern unsigned long trapbase_cpu2[];
155 extern unsigned long trapbase_cpu3[];
156
157 void __init smp4d_boot_cpus(void)
158 {
159         if (boot_cpu_id)
160                 current_set[0] = NULL;
161         smp_setup_percpu_timer();
162         local_flush_cache_all();
163 }
164
165 int __cpuinit smp4d_boot_one_cpu(int i)
166 {
167                         extern unsigned long sun4d_cpu_startup;
168                         unsigned long *entry = &sun4d_cpu_startup;
169                         struct task_struct *p;
170                         int timeout;
171                         int cpu_node;
172
173                         cpu_find_by_instance(i, &cpu_node,NULL);
174                         /* Cook up an idler for this guy. */
175                         p = fork_idle(i);
176                         current_set[i] = task_thread_info(p);
177
178                         /*
179                          * Initialize the contexts table
180                          * Since the call to prom_startcpu() trashes the structure,
181                          * we need to re-initialize it for each cpu
182                          */
183                         smp_penguin_ctable.which_io = 0;
184                         smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
185                         smp_penguin_ctable.reg_size = 0;
186
187                         /* whirrr, whirrr, whirrrrrrrrr... */
188                         SMP_PRINTK(("Starting CPU %d at %p \n", i, entry));
189                         local_flush_cache_all();
190                         prom_startcpu(cpu_node,
191                                       &smp_penguin_ctable, 0, (char *)entry);
192                                       
193                         SMP_PRINTK(("prom_startcpu returned :)\n"));
194
195                         /* wheee... it's going... */
196                         for(timeout = 0; timeout < 10000; timeout++) {
197                                 if(cpu_callin_map[i])
198                                         break;
199                                 udelay(200);
200                         }
201                         
202         if (!(cpu_callin_map[i])) {
203                 printk("Processor %d is stuck.\n", i);
204                 return -ENODEV;
205
206         }
207         local_flush_cache_all();
208         return 0;
209 }
210
211 void __init smp4d_smp_done(void)
212 {
213         int i, first;
214         int *prev;
215
216         /* setup cpu list for irq rotation */
217         first = 0;
218         prev = &first;
219         for (i = 0; i < NR_CPUS; i++)
220                 if (cpu_online(i)) {
221                         *prev = i;
222                         prev = &cpu_data(i).next;
223                 }
224         *prev = first;
225         local_flush_cache_all();
226
227         /* Free unneeded trap tables */
228         ClearPageReserved(virt_to_page(trapbase_cpu1));
229         init_page_count(virt_to_page(trapbase_cpu1));
230         free_page((unsigned long)trapbase_cpu1);
231         totalram_pages++;
232         num_physpages++;
233
234         ClearPageReserved(virt_to_page(trapbase_cpu2));
235         init_page_count(virt_to_page(trapbase_cpu2));
236         free_page((unsigned long)trapbase_cpu2);
237         totalram_pages++;
238         num_physpages++;
239
240         ClearPageReserved(virt_to_page(trapbase_cpu3));
241         init_page_count(virt_to_page(trapbase_cpu3));
242         free_page((unsigned long)trapbase_cpu3);
243         totalram_pages++;
244         num_physpages++;
245
246         /* Ok, they are spinning and ready to go. */
247         smp_processors_ready = 1;
248         sun4d_distribute_irqs();
249 }
250
251 static struct smp_funcall {
252         smpfunc_t func;
253         unsigned long arg1;
254         unsigned long arg2;
255         unsigned long arg3;
256         unsigned long arg4;
257         unsigned long arg5;
258         unsigned char processors_in[NR_CPUS];  /* Set when ipi entered. */
259         unsigned char processors_out[NR_CPUS]; /* Set when ipi exited. */
260 } ccall_info __attribute__((aligned(8)));
261
262 static DEFINE_SPINLOCK(cross_call_lock);
263
264 /* Cross calls must be serialized, at least currently. */
265 void smp4d_cross_call(smpfunc_t func, unsigned long arg1, unsigned long arg2,
266                     unsigned long arg3, unsigned long arg4, unsigned long arg5)
267 {
268         if(smp_processors_ready) {
269                 register int high = smp_highest_cpu;
270                 unsigned long flags;
271
272                 spin_lock_irqsave(&cross_call_lock, flags);
273
274                 {
275                         /* If you make changes here, make sure gcc generates proper code... */
276                         register smpfunc_t f asm("i0") = func;
277                         register unsigned long a1 asm("i1") = arg1;
278                         register unsigned long a2 asm("i2") = arg2;
279                         register unsigned long a3 asm("i3") = arg3;
280                         register unsigned long a4 asm("i4") = arg4;
281                         register unsigned long a5 asm("i5") = arg5;
282
283                         __asm__ __volatile__(
284                                 "std %0, [%6]\n\t"
285                                 "std %2, [%6 + 8]\n\t"
286                                 "std %4, [%6 + 16]\n\t" : :
287                                 "r"(f), "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5),
288                                 "r" (&ccall_info.func));
289                 }
290
291                 /* Init receive/complete mapping, plus fire the IPI's off. */
292                 {
293                         cpumask_t mask;
294                         register int i;
295
296                         mask = cpumask_of_cpu(hard_smp4d_processor_id());
297                         cpus_andnot(mask, cpu_online_map, mask);
298                         for(i = 0; i <= high; i++) {
299                                 if (cpu_isset(i, mask)) {
300                                         ccall_info.processors_in[i] = 0;
301                                         ccall_info.processors_out[i] = 0;
302                                         sun4d_send_ipi(i, IRQ_CROSS_CALL);
303                                 }
304                         }
305                 }
306
307                 {
308                         register int i;
309
310                         i = 0;
311                         do {
312                                 while(!ccall_info.processors_in[i])
313                                         barrier();
314                         } while(++i <= high);
315
316                         i = 0;
317                         do {
318                                 while(!ccall_info.processors_out[i])
319                                         barrier();
320                         } while(++i <= high);
321                 }
322
323                 spin_unlock_irqrestore(&cross_call_lock, flags);
324         }
325 }
326
327 /* Running cross calls. */
328 void smp4d_cross_call_irq(void)
329 {
330         int i = hard_smp4d_processor_id();
331
332         ccall_info.processors_in[i] = 1;
333         ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
334                         ccall_info.arg4, ccall_info.arg5);
335         ccall_info.processors_out[i] = 1;
336 }
337
338 static int smp4d_stop_cpu_sender;
339
340 static void smp4d_stop_cpu(void)
341 {
342         int me = hard_smp4d_processor_id();
343         
344         if (me != smp4d_stop_cpu_sender)
345                 while(1) barrier();
346 }
347
348 /* Cross calls, in order to work efficiently and atomically do all
349  * the message passing work themselves, only stopcpu and reschedule
350  * messages come through here.
351  */
352 void smp4d_message_pass(int target, int msg, unsigned long data, int wait)
353 {
354         int me = hard_smp4d_processor_id();
355
356         SMP_PRINTK(("smp4d_message_pass %d %d %08lx %d\n", target, msg, data, wait));
357         if (msg == MSG_STOP_CPU && target == MSG_ALL_BUT_SELF) {
358                 unsigned long flags;
359                 static DEFINE_SPINLOCK(stop_cpu_lock);
360                 spin_lock_irqsave(&stop_cpu_lock, flags);
361                 smp4d_stop_cpu_sender = me;
362                 smp4d_cross_call((smpfunc_t)smp4d_stop_cpu, 0, 0, 0, 0, 0);
363                 spin_unlock_irqrestore(&stop_cpu_lock, flags);
364         }
365         printk("Yeeee, trying to send SMP msg(%d) to %d on cpu %d\n", msg, target, me);
366         panic("Bogon SMP message pass.");
367 }
368
369 void smp4d_percpu_timer_interrupt(struct pt_regs *regs)
370 {
371         struct pt_regs *old_regs;
372         int cpu = hard_smp4d_processor_id();
373         static int cpu_tick[NR_CPUS];
374         static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd };
375
376         old_regs = set_irq_regs(regs);
377         bw_get_prof_limit(cpu); 
378         bw_clear_intr_mask(0, 1);       /* INTR_TABLE[0] & 1 is Profile IRQ */
379
380         cpu_tick[cpu]++;
381         if (!(cpu_tick[cpu] & 15)) {
382                 if (cpu_tick[cpu] == 0x60)
383                         cpu_tick[cpu] = 0;
384                 cpu_leds[cpu] = led_mask[cpu_tick[cpu] >> 4];
385                 show_leds(cpu);
386         }
387
388         profile_tick(CPU_PROFILING);
389
390         if(!--prof_counter(cpu)) {
391                 int user = user_mode(regs);
392
393                 irq_enter();
394                 update_process_times(user);
395                 irq_exit();
396
397                 prof_counter(cpu) = prof_multiplier(cpu);
398         }
399         set_irq_regs(old_regs);
400 }
401
402 extern unsigned int lvl14_resolution;
403
404 static void __init smp_setup_percpu_timer(void)
405 {
406         int cpu = hard_smp4d_processor_id();
407
408         prof_counter(cpu) = prof_multiplier(cpu) = 1;
409         load_profile_irq(cpu, lvl14_resolution);
410 }
411
412 void __init smp4d_blackbox_id(unsigned *addr)
413 {
414         int rd = *addr & 0x3e000000;
415         
416         addr[0] = 0xc0800800 | rd;              /* lda [%g0] ASI_M_VIKING_TMP1, reg */
417         addr[1] = 0x01000000;                   /* nop */
418         addr[2] = 0x01000000;                   /* nop */
419 }
420
421 void __init smp4d_blackbox_current(unsigned *addr)
422 {
423         int rd = *addr & 0x3e000000;
424         
425         addr[0] = 0xc0800800 | rd;              /* lda [%g0] ASI_M_VIKING_TMP1, reg */
426         addr[2] = 0x81282002 | rd | (rd >> 11); /* sll reg, 2, reg */
427         addr[4] = 0x01000000;                   /* nop */
428 }
429
430 void __init sun4d_init_smp(void)
431 {
432         int i;
433         extern unsigned int t_nmi[], linux_trap_ipi15_sun4d[], linux_trap_ipi15_sun4m[];
434
435         /* Patch ipi15 trap table */
436         t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m);
437         
438         /* And set btfixup... */
439         BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4d_blackbox_id);
440         BTFIXUPSET_BLACKBOX(load_current, smp4d_blackbox_current);
441         BTFIXUPSET_CALL(smp_cross_call, smp4d_cross_call, BTFIXUPCALL_NORM);
442         BTFIXUPSET_CALL(smp_message_pass, smp4d_message_pass, BTFIXUPCALL_NORM);
443         BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4d_processor_id, BTFIXUPCALL_NORM);
444         
445         for (i = 0; i < NR_CPUS; i++) {
446                 ccall_info.processors_in[i] = 1;
447                 ccall_info.processors_out[i] = 1;
448         }
449 }