arch/sparc/kernel/sun4m_smp.c

   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>
  12 #include <linux/smp_lock.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/kernel_stat.h>
  15 #include <linux/init.h>
  16 #include <linux/spinlock.h>
  17 #include <linux/mm.h>
  18 #include <linux/swap.h>
  19 #include <linux/profile.h>
  20 #include <asm/cacheflush.h>
  21 #include <asm/tlbflush.h>
  22
  23 #include <asm/ptrace.h>
  24 #include <asm/atomic.h>
  25
  26 #include <asm/delay.h>
  27 #include <asm/irq.h>
  28 #include <asm/page.h>
  29 #include <asm/pgalloc.h>
  30 #include <asm/pgtable.h>
  31 #include <asm/oplib.h>
  32 #include <asm/cpudata.h>
  33
  34 #define IRQ_RESCHEDULE          13
  35 #define IRQ_STOP_CPU            14
  36 #define IRQ_CROSS_CALL          15
  37
  38 extern ctxd_t *srmmu_ctx_table_phys;
  39
  40 extern void calibrate_delay(void);
  41
  42 extern volatile int smp_processors_ready;
  43 extern int smp_num_cpus;
  44 extern int smp_threads_ready;
  45 extern volatile unsigned long cpu_callin_map[NR_CPUS];
  46 extern unsigned char boot_cpu_id;
  47 extern int smp_activated;
  48 extern volatile int __cpu_number_map[NR_CPUS];
  49 extern volatile int __cpu_logical_map[NR_CPUS];
  50 extern volatile unsigned long ipi_count;
  51 extern volatile int smp_process_available;
  52 extern volatile int smp_commenced;
  53 extern int __smp4m_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
  74 void __init smp4m_callin(void)
  75 {
  76         int cpuid = hard_smp_processor_id();
  77
  78         local_flush_cache_all();
  79         local_flush_tlb_all();
  80
  81         set_irq_udt(boot_cpu_id);
  82
  83         /* Get our local ticker going. */
  84         smp_setup_percpu_timer();
  85
  86         calibrate_delay();
  87         smp_store_cpu_info(cpuid);
  88
  89         local_flush_cache_all();
  90         local_flush_tlb_all();
  91
  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         /* Allow master to continue. */
  99         swap((unsigned long *)&cpu_callin_map[cpuid], 1);
 100
 101         local_flush_cache_all();
 102         local_flush_tlb_all();
 103
 104         cpu_probe();
 105
 106         /* Fix idle thread fields. */
 107         __asm__ __volatile__("ld [%0], %%g6\n\t"
 108                              : : "r" (&current_set[cpuid])
 109                              : "memory" /* paranoid */);
 110
 111         /* Attach to the address space of init_task. */
 112         atomic_inc(&init_mm.mm_count);
 113         current->active_mm = &init_mm;
 114
 115         while(!smp_commenced)
 116                 barrier();
 117
 118         local_flush_cache_all();
 119         local_flush_tlb_all();
 120
 121         local_irq_enable();
 122 }
 123
 124 extern void init_IRQ(void);
 125 extern void cpu_panic(void);
 126
 127 /*
 128  *      Cycle through the processors asking the PROM to start each one.
 129  */
 130
 131 extern struct linux_prom_registers smp_penguin_ctable;
 132 extern unsigned long trapbase_cpu1[];
 133 extern unsigned long trapbase_cpu2[];
 134 extern unsigned long trapbase_cpu3[];
 135
 136 void __init smp4m_boot_cpus(void)
 137 {
 138         int cpucount = 0;
 139         int i, mid;
 140
 141         printk("Entering SMP Mode...\n");
 142
 143         local_irq_enable();
 144         cpus_clear(cpu_present_map);
 145
 146         for (i = 0; !cpu_find_by_instance(i, NULL, &mid); i++)
 147                 cpu_set(mid, cpu_present_map);
 148
 149         for(i=0; i < NR_CPUS; i++) {
 150                 __cpu_number_map[i] = -1;
 151                 __cpu_logical_map[i] = -1;
 152         }
 153
 154         __cpu_number_map[boot_cpu_id] = 0;
 155         __cpu_logical_map[0] = boot_cpu_id;
 156         current_thread_info()->cpu = boot_cpu_id;
 157
 158         smp_store_cpu_info(boot_cpu_id);
 159         set_irq_udt(boot_cpu_id);
 160         smp_setup_percpu_timer();
 161         local_flush_cache_all();
 162         if(cpu_find_by_instance(1, NULL, NULL))
 163                 return;  /* Not an MP box. */
 164         for(i = 0; i < NR_CPUS; i++) {
 165                 if(i == boot_cpu_id)
 166                         continue;
 167
 168                 if (cpu_isset(i, cpu_present_map)) {
 169                         extern unsigned long sun4m_cpu_startup;
 170                         unsigned long *entry = &sun4m_cpu_startup;
 171                         struct task_struct *p;
 172                         int timeout;
 173
 174                         /* Cook up an idler for this guy. */
 175                         p = fork_idle(i);
 176                         cpucount++;
 177                         current_set[i] = p->thread_info;
 178                         /* See trampoline.S for details... */
 179                         entry += ((i-1) * 3);
 180
 181                         /*
 182                          * Initialize the contexts table
 183                          * Since the call to prom_startcpu() trashes the structure,
 184                          * we need to re-initialize it for each cpu
 185                          */
 186                         smp_penguin_ctable.which_io = 0;
 187                         smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
 188                         smp_penguin_ctable.reg_size = 0;
 189
 190                         /* whirrr, whirrr, whirrrrrrrrr... */
 191                         printk("Starting CPU %d at %p\n", i, entry);
 192                         local_flush_cache_all();
 193                         prom_startcpu(cpu_data(i).prom_node,
 194                                       &smp_penguin_ctable, 0, (char *)entry);
 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                         if(cpu_callin_map[i]) {
 203                                 /* Another "Red Snapper". */
 204                                 __cpu_number_map[i] = i;
 205                                 __cpu_logical_map[i] = i;
 206                         } else {
 207                                 cpucount--;
 208                                 printk("Processor %d is stuck.\n", i);
 209                         }
 210                 }
 211                 if(!(cpu_callin_map[i])) {
 212                         cpu_clear(i, cpu_present_map);
 213                         __cpu_number_map[i] = -1;
 214                 }
 215         }
 216         local_flush_cache_all();
 217         if(cpucount == 0) {
 218                 printk("Error: only one Processor found.\n");
 219                 cpu_present_map = cpumask_of_cpu(smp_processor_id());
 220         } else {
 221                 unsigned long bogosum = 0;
 222                 for(i = 0; i < NR_CPUS; i++) {
 223                         if (cpu_isset(i, cpu_present_map))
 224                                 bogosum += cpu_data(i).udelay_val;
 225                 }
 226                 printk("Total of %d Processors activated (%lu.%02lu BogoMIPS).\n",
 227                        cpucount + 1,
 228                        bogosum/(500000/HZ),
 229                        (bogosum/(5000/HZ))%100);
 230                 smp_activated = 1;
 231                 smp_num_cpus = cpucount + 1;
 232         }
 233
 234         /* Free unneeded trap tables */
 235         if (!cpu_isset(i, cpu_present_map)) {
 236                 ClearPageReserved(virt_to_page(trapbase_cpu1));
 237                 set_page_count(virt_to_page(trapbase_cpu1), 1);
 238                 free_page((unsigned long)trapbase_cpu1);
 239                 totalram_pages++;
 240                 num_physpages++;
 241         }
 242         if (!cpu_isset(2, cpu_present_map)) {
 243                 ClearPageReserved(virt_to_page(trapbase_cpu2));
 244                 set_page_count(virt_to_page(trapbase_cpu2), 1);
 245                 free_page((unsigned long)trapbase_cpu2);
 246                 totalram_pages++;
 247                 num_physpages++;
 248         }
 249         if (!cpu_isset(3, cpu_present_map)) {
 250                 ClearPageReserved(virt_to_page(trapbase_cpu3));
 251                 set_page_count(virt_to_page(trapbase_cpu3), 1);
 252                 free_page((unsigned long)trapbase_cpu3);
 253                 totalram_pages++;
 254                 num_physpages++;
 255         }
 256
 257         /* Ok, they are spinning and ready to go. */
 258         smp_processors_ready = 1;
 259 }
 260
 261 /* At each hardware IRQ, we get this called to forward IRQ reception
 262  * to the next processor.  The caller must disable the IRQ level being
 263  * serviced globally so that there are no double interrupts received.
 264  *
 265  * XXX See sparc64 irq.c.
 266  */
 267 void smp4m_irq_rotate(int cpu)
 268 {
 269 }
 270
 271 /* Cross calls, in order to work efficiently and atomically do all
 272  * the message passing work themselves, only stopcpu and reschedule
 273  * messages come through here.
 274  */
 275 void smp4m_message_pass(int target, int msg, unsigned long data, int wait)
 276 {
 277         static unsigned long smp_cpu_in_msg[NR_CPUS];
 278         cpumask_t mask;
 279         int me = smp_processor_id();
 280         int irq, i;
 281
 282         if(msg == MSG_RESCHEDULE) {
 283                 irq = IRQ_RESCHEDULE;
 284
 285                 if(smp_cpu_in_msg[me])
 286                         return;
 287         } else if(msg == MSG_STOP_CPU) {
 288                 irq = IRQ_STOP_CPU;
 289         } else {
 290                 goto barf;
 291         }
 292
 293         smp_cpu_in_msg[me]++;
 294         if(target == MSG_ALL_BUT_SELF || target == MSG_ALL) {
 295                 mask = cpu_present_map;
 296                 if(target == MSG_ALL_BUT_SELF)
 297                         cpu_clear(me, mask);
 298                 for(i = 0; i < 4; i++) {
 299                         if (cpu_isset(i, mask))
 300                                 set_cpu_int(i, irq);
 301                 }
 302         } else {
 303                 set_cpu_int(target, irq);
 304         }
 305         smp_cpu_in_msg[me]--;
 306
 307         return;
 308 barf:
 309         printk("Yeeee, trying to send SMP msg(%d) on cpu %d\n", msg, me);
 310         panic("Bogon SMP message pass.");
 311 }
 312
 313 static struct smp_funcall {
 314         smpfunc_t func;
 315         unsigned long arg1;
 316         unsigned long arg2;
 317         unsigned long arg3;
 318         unsigned long arg4;
 319         unsigned long arg5;
 320         unsigned long processors_in[NR_CPUS];  /* Set when ipi entered. */
 321         unsigned long processors_out[NR_CPUS]; /* Set when ipi exited. */
 322 } ccall_info;
 323
 324 static DEFINE_SPINLOCK(cross_call_lock);
 325
 326 /* Cross calls must be serialized, at least currently. */
 327 void smp4m_cross_call(smpfunc_t func, unsigned long arg1, unsigned long arg2,
 328                     unsigned long arg3, unsigned long arg4, unsigned long arg5)
 329 {
 330         if(smp_processors_ready) {
 331                 register int ncpus = smp_num_cpus;
 332                 unsigned long flags;
 333
 334                 spin_lock_irqsave(&cross_call_lock, flags);
 335
 336                 /* Init function glue. */
 337                 ccall_info.func = func;
 338                 ccall_info.arg1 = arg1;
 339                 ccall_info.arg2 = arg2;
 340                 ccall_info.arg3 = arg3;
 341                 ccall_info.arg4 = arg4;
 342                 ccall_info.arg5 = arg5;
 343
 344                 /* Init receive/complete mapping, plus fire the IPI's off. */
 345                 {
 346                         cpumask_t mask = cpu_present_map;
 347                         register int i;
 348
 349                         cpu_clear(smp_processor_id(), mask);
 350                         for(i = 0; i < ncpus; i++) {
 351                                 if (cpu_isset(i, mask)) {
 352                                         ccall_info.processors_in[i] = 0;
 353                                         ccall_info.processors_out[i] = 0;
 354                                         set_cpu_int(i, IRQ_CROSS_CALL);
 355                                 } else {
 356                                         ccall_info.processors_in[i] = 1;
 357                                         ccall_info.processors_out[i] = 1;
 358                                 }
 359                         }
 360                 }
 361
 362                 {
 363                         register int i;
 364
 365                         i = 0;
 366                         do {
 367                                 while(!ccall_info.processors_in[i])
 368                                         barrier();
 369                         } while(++i < ncpus);
 370
 371                         i = 0;
 372                         do {
 373                                 while(!ccall_info.processors_out[i])
 374                                         barrier();
 375                         } while(++i < ncpus);
 376                 }
 377
 378                 spin_unlock_irqrestore(&cross_call_lock, flags);
 379         }
 380 }
 381
 382 /* Running cross calls. */
 383 void smp4m_cross_call_irq(void)
 384 {
 385         int i = smp_processor_id();
 386
 387         ccall_info.processors_in[i] = 1;
 388         ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
 389                         ccall_info.arg4, ccall_info.arg5);
 390         ccall_info.processors_out[i] = 1;
 391 }
 392
 393 void smp4m_percpu_timer_interrupt(struct pt_regs *regs)
 394 {
 395         int cpu = smp_processor_id();
 396
 397         clear_profile_irq(cpu);
 398
 399         profile_tick(CPU_PROFILING, regs);
 400
 401         if(!--prof_counter(cpu)) {
 402                 int user = user_mode(regs);
 403
 404                 irq_enter();
 405                 update_process_times(user);
 406                 irq_exit();
 407
 408                 prof_counter(cpu) = prof_multiplier(cpu);
 409         }
 410 }
 411
 412 extern unsigned int lvl14_resolution;
 413
 414 static void __init smp_setup_percpu_timer(void)
 415 {
 416         int cpu = smp_processor_id();
 417
 418         prof_counter(cpu) = prof_multiplier(cpu) = 1;
 419         load_profile_irq(cpu, lvl14_resolution);
 420
 421         if(cpu == boot_cpu_id)
 422                 enable_pil_irq(14);
 423 }
 424
 425 void __init smp4m_blackbox_id(unsigned *addr)
 426 {
 427         int rd = *addr & 0x3e000000;
 428         int rs1 = rd >> 11;
 429
 430         addr[0] = 0x81580000 | rd;              /* rd %tbr, reg */
 431         addr[1] = 0x8130200c | rd | rs1;        /* srl reg, 0xc, reg */
 432         addr[2] = 0x80082003 | rd | rs1;        /* and reg, 3, reg */
 433 }
 434
 435 void __init smp4m_blackbox_current(unsigned *addr)
 436 {
 437         int rd = *addr & 0x3e000000;
 438         int rs1 = rd >> 11;
 439
 440         addr[0] = 0x81580000 | rd;              /* rd %tbr, reg */
 441         addr[2] = 0x8130200a | rd | rs1;        /* srl reg, 0xa, reg */
 442         addr[4] = 0x8008200c | rd | rs1;        /* and reg, 3, reg */
 443 }
 444
 445 void __init sun4m_init_smp(void)
 446 {
 447         BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4m_blackbox_id);
 448         BTFIXUPSET_BLACKBOX(load_current, smp4m_blackbox_current);
 449         BTFIXUPSET_CALL(smp_cross_call, smp4m_cross_call, BTFIXUPCALL_NORM);
 450         BTFIXUPSET_CALL(smp_message_pass, smp4m_message_pass, BTFIXUPCALL_NORM);
 451         BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4m_processor_id, BTFIXUPCALL_NORM);
 452 }