1 /* sun4d_smp.c: Sparc SS1000/SC2000 SMP support.
3 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
5 * Based on sun4m's smp.c, which is:
6 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
11 #include <linux/kernel.h>
12 #include <linux/sched.h>
13 #include <linux/threads.h>
14 #include <linux/smp.h>
15 #include <linux/smp_lock.h>
16 #include <linux/interrupt.h>
17 #include <linux/kernel_stat.h>
18 #include <linux/init.h>
19 #include <linux/spinlock.h>
21 #include <linux/swap.h>
22 #include <linux/profile.h>
24 #include <asm/ptrace.h>
25 #include <asm/atomic.h>
27 #include <asm/delay.h>
30 #include <asm/pgalloc.h>
31 #include <asm/pgtable.h>
32 #include <asm/oplib.h>
35 #include <asm/tlbflush.h>
36 #include <asm/cacheflush.h>
37 #include <asm/cpudata.h>
39 #define IRQ_CROSS_CALL 15
41 extern ctxd_t *srmmu_ctx_table_phys;
43 extern void calibrate_delay(void);
45 extern volatile int smp_processors_ready;
46 extern int smp_num_cpus;
47 static int smp_highest_cpu;
48 extern int smp_threads_ready;
49 extern volatile unsigned long cpu_callin_map[NR_CPUS];
50 extern struct cpuinfo_sparc cpu_data[NR_CPUS];
51 extern unsigned char boot_cpu_id;
52 extern int smp_activated;
53 extern volatile int __cpu_number_map[NR_CPUS];
54 extern volatile int __cpu_logical_map[NR_CPUS];
55 extern volatile unsigned long ipi_count;
56 extern volatile int smp_process_available;
57 extern volatile int smp_commenced;
58 extern int __smp4d_processor_id(void);
60 /* #define SMP_DEBUG */
63 #define SMP_PRINTK(x) printk x
68 static inline unsigned long swap(volatile unsigned long *ptr, unsigned long val)
70 __asm__ __volatile__("swap [%1], %0\n\t" :
71 "=&r" (val), "=&r" (ptr) :
72 "0" (val), "1" (ptr));
76 static void smp_setup_percpu_timer(void);
77 extern void cpu_probe(void);
78 extern void sun4d_distribute_irqs(void);
80 void __init smp4d_callin(void)
82 int cpuid = hard_smp4d_processor_id();
83 extern spinlock_t sun4d_imsk_lock;
86 /* Show we are alive */
87 cpu_leds[cpuid] = 0x6;
90 /* Enable level15 interrupt, disable level14 interrupt for now */
91 cc_set_imsk((cc_get_imsk() & ~0x8000) | 0x4000);
93 local_flush_cache_all();
94 local_flush_tlb_all();
97 * Unblock the master CPU _only_ when the scheduler state
98 * of all secondary CPUs will be up-to-date, so after
99 * the SMP initialization the master will be just allowed
100 * to call the scheduler code.
102 /* Get our local ticker going. */
103 smp_setup_percpu_timer();
106 smp_store_cpu_info(cpuid);
107 local_flush_cache_all();
108 local_flush_tlb_all();
110 /* Allow master to continue. */
111 swap((unsigned long *)&cpu_callin_map[cpuid], 1);
112 local_flush_cache_all();
113 local_flush_tlb_all();
117 while((unsigned long)current_set[cpuid] < PAGE_OFFSET)
120 while(current_set[cpuid]->cpu != cpuid)
123 /* Fix idle thread fields. */
124 __asm__ __volatile__("ld [%0], %%g6\n\t"
125 : : "r" (¤t_set[cpuid])
126 : "memory" /* paranoid */);
128 cpu_leds[cpuid] = 0x9;
131 /* Attach to the address space of init_task. */
132 atomic_inc(&init_mm.mm_count);
133 current->active_mm = &init_mm;
135 local_flush_cache_all();
136 local_flush_tlb_all();
138 local_irq_enable(); /* We don't allow PIL 14 yet */
140 while(!smp_commenced)
143 spin_lock_irqsave(&sun4d_imsk_lock, flags);
144 cc_set_imsk(cc_get_imsk() & ~0x4000); /* Allow PIL 14 as well */
145 spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
148 extern void init_IRQ(void);
149 extern void cpu_panic(void);
152 * Cycle through the processors asking the PROM to start each one.
155 extern struct linux_prom_registers smp_penguin_ctable;
156 extern unsigned long trapbase_cpu1[];
157 extern unsigned long trapbase_cpu2[];
158 extern unsigned long trapbase_cpu3[];
160 void __init smp4d_boot_cpus(void)
165 printk("Entering SMP Mode...\n");
168 current_set[0] = NULL;
171 cpus_clear(cpu_present_map);
173 /* XXX This whole thing has to go. See sparc64. */
174 for (i = 0; !cpu_find_by_instance(i, NULL, &mid); i++)
175 cpu_set(mid, cpu_present_map);
176 SMP_PRINTK(("cpu_present_map %08lx\n", cpus_addr(cpu_present_map)[0]));
177 for(i=0; i < NR_CPUS; i++)
178 __cpu_number_map[i] = -1;
179 for(i=0; i < NR_CPUS; i++)
180 __cpu_logical_map[i] = -1;
181 __cpu_number_map[boot_cpu_id] = 0;
182 __cpu_logical_map[0] = boot_cpu_id;
183 current_thread_info()->cpu = boot_cpu_id;
184 smp_store_cpu_info(boot_cpu_id);
185 smp_setup_percpu_timer();
186 local_flush_cache_all();
187 if (cpu_find_by_instance(1, NULL, NULL))
188 return; /* Not an MP box. */
189 SMP_PRINTK(("Iterating over CPUs\n"));
190 for(i = 0; i < NR_CPUS; i++) {
194 if (cpu_isset(i, cpu_present_map)) {
195 extern unsigned long sun4d_cpu_startup;
196 unsigned long *entry = &sun4d_cpu_startup;
197 struct task_struct *p;
201 /* Cook up an idler for this guy. */
204 current_set[i] = p->thread_info;
205 for (no = 0; !cpu_find_by_instance(no, NULL, &mid)
209 * Initialize the contexts table
210 * Since the call to prom_startcpu() trashes the structure,
211 * we need to re-initialize it for each cpu
213 smp_penguin_ctable.which_io = 0;
214 smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
215 smp_penguin_ctable.reg_size = 0;
217 /* whirrr, whirrr, whirrrrrrrrr... */
218 SMP_PRINTK(("Starting CPU %d at %p task %d node %08x\n", i, entry, cpucount, cpu_data(no).prom_node));
219 local_flush_cache_all();
220 prom_startcpu(cpu_data(no).prom_node,
221 &smp_penguin_ctable, 0, (char *)entry);
223 SMP_PRINTK(("prom_startcpu returned :)\n"));
225 /* wheee... it's going... */
226 for(timeout = 0; timeout < 10000; timeout++) {
227 if(cpu_callin_map[i])
232 if(cpu_callin_map[i]) {
233 /* Another "Red Snapper". */
234 __cpu_number_map[i] = cpucount;
235 __cpu_logical_map[cpucount] = i;
238 printk("Processor %d is stuck.\n", i);
241 if(!(cpu_callin_map[i])) {
242 cpu_clear(i, cpu_present_map);
243 __cpu_number_map[i] = -1;
246 local_flush_cache_all();
248 printk("Error: only one Processor found.\n");
249 cpu_present_map = cpumask_of_cpu(hard_smp4d_processor_id());
251 unsigned long bogosum = 0;
253 for(i = 0; i < NR_CPUS; i++) {
254 if (cpu_isset(i, cpu_present_map)) {
255 bogosum += cpu_data(i).udelay_val;
259 SMP_PRINTK(("Total of %d Processors activated (%lu.%02lu BogoMIPS).\n", cpucount + 1, bogosum/(500000/HZ), (bogosum/(5000/HZ))%100));
260 printk("Total of %d Processors activated (%lu.%02lu BogoMIPS).\n",
263 (bogosum/(5000/HZ))%100);
265 smp_num_cpus = cpucount + 1;
268 /* Free unneeded trap tables */
269 ClearPageReserved(virt_to_page(trapbase_cpu1));
270 set_page_count(virt_to_page(trapbase_cpu1), 1);
271 free_page((unsigned long)trapbase_cpu1);
275 ClearPageReserved(virt_to_page(trapbase_cpu2));
276 set_page_count(virt_to_page(trapbase_cpu2), 1);
277 free_page((unsigned long)trapbase_cpu2);
281 ClearPageReserved(virt_to_page(trapbase_cpu3));
282 set_page_count(virt_to_page(trapbase_cpu3), 1);
283 free_page((unsigned long)trapbase_cpu3);
287 /* Ok, they are spinning and ready to go. */
288 smp_processors_ready = 1;
289 sun4d_distribute_irqs();
292 static struct smp_funcall {
299 unsigned char processors_in[NR_CPUS]; /* Set when ipi entered. */
300 unsigned char processors_out[NR_CPUS]; /* Set when ipi exited. */
301 } ccall_info __attribute__((aligned(8)));
303 static DEFINE_SPINLOCK(cross_call_lock);
305 /* Cross calls must be serialized, at least currently. */
306 void smp4d_cross_call(smpfunc_t func, unsigned long arg1, unsigned long arg2,
307 unsigned long arg3, unsigned long arg4, unsigned long arg5)
309 if(smp_processors_ready) {
310 register int high = smp_highest_cpu;
313 spin_lock_irqsave(&cross_call_lock, flags);
316 /* If you make changes here, make sure gcc generates proper code... */
317 register smpfunc_t f asm("i0") = func;
318 register unsigned long a1 asm("i1") = arg1;
319 register unsigned long a2 asm("i2") = arg2;
320 register unsigned long a3 asm("i3") = arg3;
321 register unsigned long a4 asm("i4") = arg4;
322 register unsigned long a5 asm("i5") = arg5;
324 __asm__ __volatile__(
326 "std %2, [%6 + 8]\n\t"
327 "std %4, [%6 + 16]\n\t" : :
328 "r"(f), "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5),
329 "r" (&ccall_info.func));
332 /* Init receive/complete mapping, plus fire the IPI's off. */
337 mask = cpumask_of_cpu(hard_smp4d_processor_id());
338 cpus_andnot(mask, cpu_present_map, mask);
339 for(i = 0; i <= high; i++) {
340 if (cpu_isset(i, mask)) {
341 ccall_info.processors_in[i] = 0;
342 ccall_info.processors_out[i] = 0;
343 sun4d_send_ipi(i, IRQ_CROSS_CALL);
353 while(!ccall_info.processors_in[i])
355 } while(++i <= high);
359 while(!ccall_info.processors_out[i])
361 } while(++i <= high);
364 spin_unlock_irqrestore(&cross_call_lock, flags);
368 /* Running cross calls. */
369 void smp4d_cross_call_irq(void)
371 int i = hard_smp4d_processor_id();
373 ccall_info.processors_in[i] = 1;
374 ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
375 ccall_info.arg4, ccall_info.arg5);
376 ccall_info.processors_out[i] = 1;
379 static int smp4d_stop_cpu_sender;
381 static void smp4d_stop_cpu(void)
383 int me = hard_smp4d_processor_id();
385 if (me != smp4d_stop_cpu_sender)
389 /* Cross calls, in order to work efficiently and atomically do all
390 * the message passing work themselves, only stopcpu and reschedule
391 * messages come through here.
393 void smp4d_message_pass(int target, int msg, unsigned long data, int wait)
395 int me = hard_smp4d_processor_id();
397 SMP_PRINTK(("smp4d_message_pass %d %d %08lx %d\n", target, msg, data, wait));
398 if (msg == MSG_STOP_CPU && target == MSG_ALL_BUT_SELF) {
400 static DEFINE_SPINLOCK(stop_cpu_lock);
401 spin_lock_irqsave(&stop_cpu_lock, flags);
402 smp4d_stop_cpu_sender = me;
403 smp4d_cross_call((smpfunc_t)smp4d_stop_cpu, 0, 0, 0, 0, 0);
404 spin_unlock_irqrestore(&stop_cpu_lock, flags);
406 printk("Yeeee, trying to send SMP msg(%d) to %d on cpu %d\n", msg, target, me);
407 panic("Bogon SMP message pass.");
410 void smp4d_percpu_timer_interrupt(struct pt_regs *regs)
412 int cpu = hard_smp4d_processor_id();
413 static int cpu_tick[NR_CPUS];
414 static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd };
416 bw_get_prof_limit(cpu);
417 bw_clear_intr_mask(0, 1); /* INTR_TABLE[0] & 1 is Profile IRQ */
420 if (!(cpu_tick[cpu] & 15)) {
421 if (cpu_tick[cpu] == 0x60)
423 cpu_leds[cpu] = led_mask[cpu_tick[cpu] >> 4];
427 profile_tick(CPU_PROFILING, regs);
429 if(!--prof_counter(cpu)) {
430 int user = user_mode(regs);
433 update_process_times(user);
436 prof_counter(cpu) = prof_multiplier(cpu);
440 extern unsigned int lvl14_resolution;
442 static void __init smp_setup_percpu_timer(void)
444 int cpu = hard_smp4d_processor_id();
446 prof_counter(cpu) = prof_multiplier(cpu) = 1;
447 load_profile_irq(cpu, lvl14_resolution);
450 void __init smp4d_blackbox_id(unsigned *addr)
452 int rd = *addr & 0x3e000000;
454 addr[0] = 0xc0800800 | rd; /* lda [%g0] ASI_M_VIKING_TMP1, reg */
455 addr[1] = 0x01000000; /* nop */
456 addr[2] = 0x01000000; /* nop */
459 void __init smp4d_blackbox_current(unsigned *addr)
461 int rd = *addr & 0x3e000000;
463 addr[0] = 0xc0800800 | rd; /* lda [%g0] ASI_M_VIKING_TMP1, reg */
464 addr[2] = 0x81282002 | rd | (rd >> 11); /* sll reg, 2, reg */
465 addr[4] = 0x01000000; /* nop */
468 void __init sun4d_init_smp(void)
471 extern unsigned int t_nmi[], linux_trap_ipi15_sun4d[], linux_trap_ipi15_sun4m[];
473 /* Patch ipi15 trap table */
474 t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m);
476 /* And set btfixup... */
477 BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4d_blackbox_id);
478 BTFIXUPSET_BLACKBOX(load_current, smp4d_blackbox_current);
479 BTFIXUPSET_CALL(smp_cross_call, smp4d_cross_call, BTFIXUPCALL_NORM);
480 BTFIXUPSET_CALL(smp_message_pass, smp4d_message_pass, BTFIXUPCALL_NORM);
481 BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4d_processor_id, BTFIXUPCALL_NORM);
483 for (i = 0; i < NR_CPUS; i++) {
484 ccall_info.processors_in[i] = 1;
485 ccall_info.processors_out[i] = 1;