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   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/interrupt.h>
  13 #include <linux/kernel_stat.h>
  14 #include <linux/init.h>
  15 #include <linux/spinlock.h>
  16 #include <linux/mm.h>
  17 #include <linux/swap.h>
  18 #include <linux/profile.h>
  19 #include <asm/cacheflush.h>
  20 #include <asm/tlbflush.h>
  21 #include <asm/irq_regs.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 #include "irq.h"
  35
  36 #define IRQ_RESCHEDULE          13
  37 #define IRQ_STOP_CPU            14
  38 #define IRQ_CROSS_CALL          15
  39
  40 extern ctxd_t *srmmu_ctx_table_phys;
  41
  42 extern void calibrate_delay(void);
  43
  44 extern volatile unsigned long cpu_callin_map[NR_CPUS];
  45 extern unsigned char boot_cpu_id;
  46
  47 extern cpumask_t smp_commenced_mask;
  48
  49 extern int __smp4m_processor_id(void);
  50
  51 /*#define SMP_DEBUG*/
  52
  53 #ifdef SMP_DEBUG
  54 #define SMP_PRINTK(x)   printk x
  55 #else
  56 #define SMP_PRINTK(x)
  57 #endif
  58
  59 static inline unsigned long swap(volatile unsigned long *ptr, unsigned long val)
  60 {
  61         __asm__ __volatile__("swap [%1], %0\n\t" :
  62                              "=&r" (val), "=&r" (ptr) :
  63                              "0" (val), "1" (ptr));
  64         return val;
  65 }
  66
  67 static void smp_setup_percpu_timer(void);
  68 extern void cpu_probe(void);
  69
  70 void __cpuinit smp4m_callin(void)
  71 {
  72         int cpuid = hard_smp_processor_id();
  73
  74         local_flush_cache_all();
  75         local_flush_tlb_all();
  76
  77         /* Get our local ticker going. */
  78         smp_setup_percpu_timer();
  79
  80         calibrate_delay();
  81         smp_store_cpu_info(cpuid);
  82
  83         local_flush_cache_all();
  84         local_flush_tlb_all();
  85
  86         /*
  87          * Unblock the master CPU _only_ when the scheduler state
  88          * of all secondary CPUs will be up-to-date, so after
  89          * the SMP initialization the master will be just allowed
  90          * to call the scheduler code.
  91          */
  92         /* Allow master to continue. */
  93         swap(&cpu_callin_map[cpuid], 1);
  94
  95         /* XXX: What's up with all the flushes? */
  96         local_flush_cache_all();
  97         local_flush_tlb_all();
  98
  99         cpu_probe();
 100
 101         /* Fix idle thread fields. */
 102         __asm__ __volatile__("ld [%0], %%g6\n\t"
 103                              : : "r" (&current_set[cpuid])
 104                              : "memory" /* paranoid */);
 105
 106         /* Attach to the address space of init_task. */
 107         atomic_inc(&init_mm.mm_count);
 108         current->active_mm = &init_mm;
 109
 110         while (!cpu_isset(cpuid, smp_commenced_mask))
 111                 mb();
 112
 113         local_irq_enable();
 114
 115         cpu_set(cpuid, cpu_online_map);
 116 }
 117
 118 /*
 119  *      Cycle through the processors asking the PROM to start each one.
 120  */
 121
 122 extern struct linux_prom_registers smp_penguin_ctable;
 123 extern unsigned long trapbase_cpu1[];
 124 extern unsigned long trapbase_cpu2[];
 125 extern unsigned long trapbase_cpu3[];
 126
 127 void __init smp4m_boot_cpus(void)
 128 {
 129         smp_setup_percpu_timer();
 130         local_flush_cache_all();
 131 }
 132
 133 int __cpuinit smp4m_boot_one_cpu(int i)
 134 {
 135         extern unsigned long sun4m_cpu_startup;
 136         unsigned long *entry = &sun4m_cpu_startup;
 137         struct task_struct *p;
 138         int timeout;
 139         int cpu_node;
 140
 141         cpu_find_by_mid(i, &cpu_node);
 142
 143         /* Cook up an idler for this guy. */
 144         p = fork_idle(i);
 145         current_set[i] = task_thread_info(p);
 146         /* See trampoline.S for details... */
 147         entry += ((i-1) * 3);
 148
 149         /*
 150          * Initialize the contexts table
 151          * Since the call to prom_startcpu() trashes the structure,
 152          * we need to re-initialize it for each cpu
 153          */
 154         smp_penguin_ctable.which_io = 0;
 155         smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
 156         smp_penguin_ctable.reg_size = 0;
 157
 158         /* whirrr, whirrr, whirrrrrrrrr... */
 159         printk("Starting CPU %d at %p\n", i, entry);
 160         local_flush_cache_all();
 161         prom_startcpu(cpu_node,
 162                       &smp_penguin_ctable, 0, (char *)entry);
 163
 164         /* wheee... it's going... */
 165         for(timeout = 0; timeout < 10000; timeout++) {
 166                 if(cpu_callin_map[i])
 167                         break;
 168                 udelay(200);
 169         }
 170
 171         if (!(cpu_callin_map[i])) {
 172                 printk("Processor %d is stuck.\n", i);
 173                 return -ENODEV;
 174         }
 175
 176         local_flush_cache_all();
 177         return 0;
 178 }
 179
 180 void __init smp4m_smp_done(void)
 181 {
 182         int i, first;
 183         int *prev;
 184
 185         /* setup cpu list for irq rotation */
 186         first = 0;
 187         prev = &first;
 188         for (i = 0; i < NR_CPUS; i++) {
 189                 if (cpu_online(i)) {
 190                         *prev = i;
 191                         prev = &cpu_data(i).next;
 192                 }
 193         }
 194         *prev = first;
 195         local_flush_cache_all();
 196
 197         /* Free unneeded trap tables */
 198         if (!cpu_isset(1, cpu_present_map)) {
 199                 ClearPageReserved(virt_to_page(trapbase_cpu1));
 200                 init_page_count(virt_to_page(trapbase_cpu1));
 201                 free_page((unsigned long)trapbase_cpu1);
 202                 totalram_pages++;
 203                 num_physpages++;
 204         }
 205         if (!cpu_isset(2, cpu_present_map)) {
 206                 ClearPageReserved(virt_to_page(trapbase_cpu2));
 207                 init_page_count(virt_to_page(trapbase_cpu2));
 208                 free_page((unsigned long)trapbase_cpu2);
 209                 totalram_pages++;
 210                 num_physpages++;
 211         }
 212         if (!cpu_isset(3, cpu_present_map)) {
 213                 ClearPageReserved(virt_to_page(trapbase_cpu3));
 214                 init_page_count(virt_to_page(trapbase_cpu3));
 215                 free_page((unsigned long)trapbase_cpu3);
 216                 totalram_pages++;
 217                 num_physpages++;
 218         }
 219
 220         /* Ok, they are spinning and ready to go. */
 221 }
 222
 223 /* At each hardware IRQ, we get this called to forward IRQ reception
 224  * to the next processor.  The caller must disable the IRQ level being
 225  * serviced globally so that there are no double interrupts received.
 226  *
 227  * XXX See sparc64 irq.c.
 228  */
 229 void smp4m_irq_rotate(int cpu)
 230 {
 231         int next = cpu_data(cpu).next;
 232         if (next != cpu)
 233                 set_irq_udt(next);
 234 }
 235
 236 /* Cross calls, in order to work efficiently and atomically do all
 237  * the message passing work themselves, only stopcpu and reschedule
 238  * messages come through here.
 239  */
 240 void smp4m_message_pass(int target, int msg, unsigned long data, int wait)
 241 {
 242         static unsigned long smp_cpu_in_msg[NR_CPUS];
 243         cpumask_t mask;
 244         int me = smp_processor_id();
 245         int irq, i;
 246
 247         if(msg == MSG_RESCHEDULE) {
 248                 irq = IRQ_RESCHEDULE;
 249
 250                 if(smp_cpu_in_msg[me])
 251                         return;
 252         } else if(msg == MSG_STOP_CPU) {
 253                 irq = IRQ_STOP_CPU;
 254         } else {
 255                 goto barf;
 256         }
 257
 258         smp_cpu_in_msg[me]++;
 259         if(target == MSG_ALL_BUT_SELF || target == MSG_ALL) {
 260                 mask = cpu_online_map;
 261                 if(target == MSG_ALL_BUT_SELF)
 262                         cpu_clear(me, mask);
 263                 for(i = 0; i < 4; i++) {
 264                         if (cpu_isset(i, mask))
 265                                 set_cpu_int(i, irq);
 266                 }
 267         } else {
 268                 set_cpu_int(target, irq);
 269         }
 270         smp_cpu_in_msg[me]--;
 271
 272         return;
 273 barf:
 274         printk("Yeeee, trying to send SMP msg(%d) on cpu %d\n", msg, me);
 275         panic("Bogon SMP message pass.");
 276 }
 277
 278 static struct smp_funcall {
 279         smpfunc_t func;
 280         unsigned long arg1;
 281         unsigned long arg2;
 282         unsigned long arg3;
 283         unsigned long arg4;
 284         unsigned long arg5;
 285         unsigned long processors_in[SUN4M_NCPUS];  /* Set when ipi entered. */
 286         unsigned long processors_out[SUN4M_NCPUS]; /* Set when ipi exited. */
 287 } ccall_info;
 288
 289 static DEFINE_SPINLOCK(cross_call_lock);
 290
 291 /* Cross calls must be serialized, at least currently. */
 292 void smp4m_cross_call(smpfunc_t func, unsigned long arg1, unsigned long arg2,
 293                     unsigned long arg3, unsigned long arg4, unsigned long arg5)
 294 {
 295                 register int ncpus = SUN4M_NCPUS;
 296                 unsigned long flags;
 297
 298                 spin_lock_irqsave(&cross_call_lock, flags);
 299
 300                 /* Init function glue. */
 301                 ccall_info.func = func;
 302                 ccall_info.arg1 = arg1;
 303                 ccall_info.arg2 = arg2;
 304                 ccall_info.arg3 = arg3;
 305                 ccall_info.arg4 = arg4;
 306                 ccall_info.arg5 = arg5;
 307
 308                 /* Init receive/complete mapping, plus fire the IPI's off. */
 309                 {
 310                         cpumask_t mask = cpu_online_map;
 311                         register int i;
 312
 313                         cpu_clear(smp_processor_id(), mask);
 314                         for(i = 0; i < ncpus; i++) {
 315                                 if (cpu_isset(i, mask)) {
 316                                         ccall_info.processors_in[i] = 0;
 317                                         ccall_info.processors_out[i] = 0;
 318                                         set_cpu_int(i, IRQ_CROSS_CALL);
 319                                 } else {
 320                                         ccall_info.processors_in[i] = 1;
 321                                         ccall_info.processors_out[i] = 1;
 322                                 }
 323                         }
 324                 }
 325
 326                 {
 327                         register int i;
 328
 329                         i = 0;
 330                         do {
 331                                 while(!ccall_info.processors_in[i])
 332                                         barrier();
 333                         } while(++i < ncpus);
 334
 335                         i = 0;
 336                         do {
 337                                 while(!ccall_info.processors_out[i])
 338                                         barrier();
 339                         } while(++i < ncpus);
 340                 }
 341
 342                 spin_unlock_irqrestore(&cross_call_lock, flags);
 343 }
 344
 345 /* Running cross calls. */
 346 void smp4m_cross_call_irq(void)
 347 {
 348         int i = smp_processor_id();
 349
 350         ccall_info.processors_in[i] = 1;
 351         ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
 352                         ccall_info.arg4, ccall_info.arg5);
 353         ccall_info.processors_out[i] = 1;
 354 }
 355
 356 void smp4m_percpu_timer_interrupt(struct pt_regs *regs)
 357 {
 358         struct pt_regs *old_regs;
 359         int cpu = smp_processor_id();
 360
 361         old_regs = set_irq_regs(regs);
 362
 363         clear_profile_irq(cpu);
 364
 365         profile_tick(CPU_PROFILING);
 366
 367         if(!--prof_counter(cpu)) {
 368                 int user = user_mode(regs);
 369
 370                 irq_enter();
 371                 update_process_times(user);
 372                 irq_exit();
 373
 374                 prof_counter(cpu) = prof_multiplier(cpu);
 375         }
 376         set_irq_regs(old_regs);
 377 }
 378
 379 extern unsigned int lvl14_resolution;
 380
 381 static void __init smp_setup_percpu_timer(void)
 382 {
 383         int cpu = smp_processor_id();
 384
 385         prof_counter(cpu) = prof_multiplier(cpu) = 1;
 386         load_profile_irq(cpu, lvl14_resolution);
 387
 388         if(cpu == boot_cpu_id)
 389                 enable_pil_irq(14);
 390 }
 391
 392 void __init smp4m_blackbox_id(unsigned *addr)
 393 {
 394         int rd = *addr & 0x3e000000;
 395         int rs1 = rd >> 11;
 396
 397         addr[0] = 0x81580000 | rd;              /* rd %tbr, reg */
 398         addr[1] = 0x8130200c | rd | rs1;        /* srl reg, 0xc, reg */
 399         addr[2] = 0x80082003 | rd | rs1;        /* and reg, 3, reg */
 400 }
 401
 402 void __init smp4m_blackbox_current(unsigned *addr)
 403 {
 404         int rd = *addr & 0x3e000000;
 405         int rs1 = rd >> 11;
 406
 407         addr[0] = 0x81580000 | rd;              /* rd %tbr, reg */
 408         addr[2] = 0x8130200a | rd | rs1;        /* srl reg, 0xa, reg */
 409         addr[4] = 0x8008200c | rd | rs1;        /* and reg, 0xc, reg */
 410 }
 411
 412 void __init sun4m_init_smp(void)
 413 {
 414         BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4m_blackbox_id);
 415         BTFIXUPSET_BLACKBOX(load_current, smp4m_blackbox_current);
 416         BTFIXUPSET_CALL(smp_cross_call, smp4m_cross_call, BTFIXUPCALL_NORM);
 417         BTFIXUPSET_CALL(smp_message_pass, smp4m_message_pass, BTFIXUPCALL_NORM);
 418         BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4m_processor_id, BTFIXUPCALL_NORM);
 419 }