Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-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 static void smp4d_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
266                              unsigned long arg2, unsigned long arg3,
267                              unsigned long arg4)
268 {
269         if(smp_processors_ready) {
270                 register int high = smp_highest_cpu;
271                 unsigned long flags;
272
273                 spin_lock_irqsave(&cross_call_lock, flags);
274
275                 {
276                         /* If you make changes here, make sure gcc generates proper code... */
277                         register smpfunc_t f asm("i0") = func;
278                         register unsigned long a1 asm("i1") = arg1;
279                         register unsigned long a2 asm("i2") = arg2;
280                         register unsigned long a3 asm("i3") = arg3;
281                         register unsigned long a4 asm("i4") = arg4;
282                         register unsigned long a5 asm("i5") = 0;
283
284                         __asm__ __volatile__(
285                                 "std %0, [%6]\n\t"
286                                 "std %2, [%6 + 8]\n\t"
287                                 "std %4, [%6 + 16]\n\t" : :
288                                 "r"(f), "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5),
289                                 "r" (&ccall_info.func));
290                 }
291
292                 /* Init receive/complete mapping, plus fire the IPI's off. */
293                 {
294                         register int i;
295
296                         cpu_clear(smp_processor_id(), mask);
297                         cpus_and(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                                 if (!cpu_isset(i, mask))
313                                         continue;
314                                 while(!ccall_info.processors_in[i])
315                                         barrier();
316                         } while(++i <= high);
317
318                         i = 0;
319                         do {
320                                 if (!cpu_isset(i, mask))
321                                         continue;
322                                 while(!ccall_info.processors_out[i])
323                                         barrier();
324                         } while(++i <= high);
325                 }
326
327                 spin_unlock_irqrestore(&cross_call_lock, flags);
328         }
329 }
330
331 /* Running cross calls. */
332 void smp4d_cross_call_irq(void)
333 {
334         int i = hard_smp4d_processor_id();
335
336         ccall_info.processors_in[i] = 1;
337         ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
338                         ccall_info.arg4, ccall_info.arg5);
339         ccall_info.processors_out[i] = 1;
340 }
341
342 void smp4d_percpu_timer_interrupt(struct pt_regs *regs)
343 {
344         struct pt_regs *old_regs;
345         int cpu = hard_smp4d_processor_id();
346         static int cpu_tick[NR_CPUS];
347         static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd };
348
349         old_regs = set_irq_regs(regs);
350         bw_get_prof_limit(cpu); 
351         bw_clear_intr_mask(0, 1);       /* INTR_TABLE[0] & 1 is Profile IRQ */
352
353         cpu_tick[cpu]++;
354         if (!(cpu_tick[cpu] & 15)) {
355                 if (cpu_tick[cpu] == 0x60)
356                         cpu_tick[cpu] = 0;
357                 cpu_leds[cpu] = led_mask[cpu_tick[cpu] >> 4];
358                 show_leds(cpu);
359         }
360
361         profile_tick(CPU_PROFILING);
362
363         if(!--prof_counter(cpu)) {
364                 int user = user_mode(regs);
365
366                 irq_enter();
367                 update_process_times(user);
368                 irq_exit();
369
370                 prof_counter(cpu) = prof_multiplier(cpu);
371         }
372         set_irq_regs(old_regs);
373 }
374
375 extern unsigned int lvl14_resolution;
376
377 static void __init smp_setup_percpu_timer(void)
378 {
379         int cpu = hard_smp4d_processor_id();
380
381         prof_counter(cpu) = prof_multiplier(cpu) = 1;
382         load_profile_irq(cpu, lvl14_resolution);
383 }
384
385 void __init smp4d_blackbox_id(unsigned *addr)
386 {
387         int rd = *addr & 0x3e000000;
388         
389         addr[0] = 0xc0800800 | rd;              /* lda [%g0] ASI_M_VIKING_TMP1, reg */
390         addr[1] = 0x01000000;                   /* nop */
391         addr[2] = 0x01000000;                   /* nop */
392 }
393
394 void __init smp4d_blackbox_current(unsigned *addr)
395 {
396         int rd = *addr & 0x3e000000;
397         
398         addr[0] = 0xc0800800 | rd;              /* lda [%g0] ASI_M_VIKING_TMP1, reg */
399         addr[2] = 0x81282002 | rd | (rd >> 11); /* sll reg, 2, reg */
400         addr[4] = 0x01000000;                   /* nop */
401 }
402
403 void __init sun4d_init_smp(void)
404 {
405         int i;
406         extern unsigned int t_nmi[], linux_trap_ipi15_sun4d[], linux_trap_ipi15_sun4m[];
407
408         /* Patch ipi15 trap table */
409         t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m);
410         
411         /* And set btfixup... */
412         BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4d_blackbox_id);
413         BTFIXUPSET_BLACKBOX(load_current, smp4d_blackbox_current);
414         BTFIXUPSET_CALL(smp_cross_call, smp4d_cross_call, BTFIXUPCALL_NORM);
415         BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4d_processor_id, BTFIXUPCALL_NORM);
416         
417         for (i = 0; i < NR_CPUS; i++) {
418                 ccall_info.processors_in[i] = 1;
419                 ccall_info.processors_out[i] = 1;
420         }
421 }