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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 <linux/delay.h>
  20
  21 #include <asm/cacheflush.h>
  22 #include <asm/tlbflush.h>
  23 #include <asm/irq_regs.h>
  24
  25 #include <asm/ptrace.h>
  26 #include <asm/atomic.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/cpudata.h>
  34
  35 #include "irq.h"
  36
  37 #define IRQ_CROSS_CALL          15
  38
  39 extern ctxd_t *srmmu_ctx_table_phys;
  40
  41 extern volatile unsigned long cpu_callin_map[NR_CPUS];
  42 extern unsigned char boot_cpu_id;
  43
  44 extern cpumask_t smp_commenced_mask;
  45
  46 extern int __smp4m_processor_id(void);
  47
  48 /*#define SMP_DEBUG*/
  49
  50 #ifdef SMP_DEBUG
  51 #define SMP_PRINTK(x)   printk x
  52 #else
  53 #define SMP_PRINTK(x)
  54 #endif
  55
  56 static inline unsigned long swap(volatile unsigned long *ptr, unsigned long val)
  57 {
  58         __asm__ __volatile__("swap [%1], %0\n\t" :
  59                              "=&r" (val), "=&r" (ptr) :
  60                              "0" (val), "1" (ptr));
  61         return val;
  62 }
  63
  64 static void smp_setup_percpu_timer(void);
  65 extern void cpu_probe(void);
  66
  67 void __cpuinit smp4m_callin(void)
  68 {
  69         int cpuid = hard_smp_processor_id();
  70
  71         local_flush_cache_all();
  72         local_flush_tlb_all();
  73
  74         notify_cpu_starting(cpuid);
  75
  76         /* Get our local ticker going. */
  77         smp_setup_percpu_timer();
  78
  79         calibrate_delay();
  80         smp_store_cpu_info(cpuid);
  81
  82         local_flush_cache_all();
  83         local_flush_tlb_all();
  84
  85         /*
  86          * Unblock the master CPU _only_ when the scheduler state
  87          * of all secondary CPUs will be up-to-date, so after
  88          * the SMP initialization the master will be just allowed
  89          * to call the scheduler code.
  90          */
  91         /* Allow master to continue. */
  92         swap(&cpu_callin_map[cpuid], 1);
  93
  94         /* XXX: What's up with all the flushes? */
  95         local_flush_cache_all();
  96         local_flush_tlb_all();
  97
  98         cpu_probe();
  99
 100         /* Fix idle thread fields. */
 101         __asm__ __volatile__("ld [%0], %%g6\n\t"
 102                              : : "r" (&current_set[cpuid])
 103                              : "memory" /* paranoid */);
 104
 105         /* Attach to the address space of init_task. */
 106         atomic_inc(&init_mm.mm_count);
 107         current->active_mm = &init_mm;
 108
 109         while (!cpu_isset(cpuid, smp_commenced_mask))
 110                 mb();
 111
 112         local_irq_enable();
 113
 114         cpu_set(cpuid, cpu_online_map);
 115 }
 116
 117 /*
 118  *      Cycle through the processors asking the PROM to start each one.
 119  */
 120
 121 extern struct linux_prom_registers smp_penguin_ctable;
 122 extern unsigned long trapbase_cpu1[];
 123 extern unsigned long trapbase_cpu2[];
 124 extern unsigned long trapbase_cpu3[];
 125
 126 void __init smp4m_boot_cpus(void)
 127 {
 128         smp_setup_percpu_timer();
 129         local_flush_cache_all();
 130 }
 131
 132 int __cpuinit smp4m_boot_one_cpu(int i)
 133 {
 134         extern unsigned long sun4m_cpu_startup;
 135         unsigned long *entry = &sun4m_cpu_startup;
 136         struct task_struct *p;
 137         int timeout;
 138         int cpu_node;
 139
 140         cpu_find_by_mid(i, &cpu_node);
 141
 142         /* Cook up an idler for this guy. */
 143         p = fork_idle(i);
 144         current_set[i] = task_thread_info(p);
 145         /* See trampoline.S for details... */
 146         entry += ((i-1) * 3);
 147
 148         /*
 149          * Initialize the contexts table
 150          * Since the call to prom_startcpu() trashes the structure,
 151          * we need to re-initialize it for each cpu
 152          */
 153         smp_penguin_ctable.which_io = 0;
 154         smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
 155         smp_penguin_ctable.reg_size = 0;
 156
 157         /* whirrr, whirrr, whirrrrrrrrr... */
 158         printk("Starting CPU %d at %p\n", i, entry);
 159         local_flush_cache_all();
 160         prom_startcpu(cpu_node,
 161                       &smp_penguin_ctable, 0, (char *)entry);
 162
 163         /* wheee... it's going... */
 164         for(timeout = 0; timeout < 10000; timeout++) {
 165                 if(cpu_callin_map[i])
 166                         break;
 167                 udelay(200);
 168         }
 169
 170         if (!(cpu_callin_map[i])) {
 171                 printk("Processor %d is stuck.\n", i);
 172                 return -ENODEV;
 173         }
 174
 175         local_flush_cache_all();
 176         return 0;
 177 }
 178
 179 void __init smp4m_smp_done(void)
 180 {
 181         int i, first;
 182         int *prev;
 183
 184         /* setup cpu list for irq rotation */
 185         first = 0;
 186         prev = &first;
 187         for (i = 0; i < NR_CPUS; i++) {
 188                 if (cpu_online(i)) {
 189                         *prev = i;
 190                         prev = &cpu_data(i).next;
 191                 }
 192         }
 193         *prev = first;
 194         local_flush_cache_all();
 195
 196         /* Free unneeded trap tables */
 197         if (!cpu_isset(1, cpu_present_map)) {
 198                 ClearPageReserved(virt_to_page(trapbase_cpu1));
 199                 init_page_count(virt_to_page(trapbase_cpu1));
 200                 free_page((unsigned long)trapbase_cpu1);
 201                 totalram_pages++;
 202                 num_physpages++;
 203         }
 204         if (!cpu_isset(2, cpu_present_map)) {
 205                 ClearPageReserved(virt_to_page(trapbase_cpu2));
 206                 init_page_count(virt_to_page(trapbase_cpu2));
 207                 free_page((unsigned long)trapbase_cpu2);
 208                 totalram_pages++;
 209                 num_physpages++;
 210         }
 211         if (!cpu_isset(3, cpu_present_map)) {
 212                 ClearPageReserved(virt_to_page(trapbase_cpu3));
 213                 init_page_count(virt_to_page(trapbase_cpu3));
 214                 free_page((unsigned long)trapbase_cpu3);
 215                 totalram_pages++;
 216                 num_physpages++;
 217         }
 218
 219         /* Ok, they are spinning and ready to go. */
 220 }
 221
 222 /* At each hardware IRQ, we get this called to forward IRQ reception
 223  * to the next processor.  The caller must disable the IRQ level being
 224  * serviced globally so that there are no double interrupts received.
 225  *
 226  * XXX See sparc64 irq.c.
 227  */
 228 void smp4m_irq_rotate(int cpu)
 229 {
 230         int next = cpu_data(cpu).next;
 231         if (next != cpu)
 232                 set_irq_udt(next);
 233 }
 234
 235 static struct smp_funcall {
 236         smpfunc_t func;
 237         unsigned long arg1;
 238         unsigned long arg2;
 239         unsigned long arg3;
 240         unsigned long arg4;
 241         unsigned long arg5;
 242         unsigned long processors_in[SUN4M_NCPUS];  /* Set when ipi entered. */
 243         unsigned long processors_out[SUN4M_NCPUS]; /* Set when ipi exited. */
 244 } ccall_info;
 245
 246 static DEFINE_SPINLOCK(cross_call_lock);
 247
 248 /* Cross calls must be serialized, at least currently. */
 249 static void smp4m_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
 250                              unsigned long arg2, unsigned long arg3,
 251                              unsigned long arg4)
 252 {
 253                 register int ncpus = SUN4M_NCPUS;
 254                 unsigned long flags;
 255
 256                 spin_lock_irqsave(&cross_call_lock, flags);
 257
 258                 /* Init function glue. */
 259                 ccall_info.func = func;
 260                 ccall_info.arg1 = arg1;
 261                 ccall_info.arg2 = arg2;
 262                 ccall_info.arg3 = arg3;
 263                 ccall_info.arg4 = arg4;
 264                 ccall_info.arg5 = 0;
 265
 266                 /* Init receive/complete mapping, plus fire the IPI's off. */
 267                 {
 268                         register int i;
 269
 270                         cpu_clear(smp_processor_id(), mask);
 271                         cpus_and(mask, cpu_online_map, mask);
 272                         for(i = 0; i < ncpus; i++) {
 273                                 if (cpu_isset(i, mask)) {
 274                                         ccall_info.processors_in[i] = 0;
 275                                         ccall_info.processors_out[i] = 0;
 276                                         set_cpu_int(i, IRQ_CROSS_CALL);
 277                                 } else {
 278                                         ccall_info.processors_in[i] = 1;
 279                                         ccall_info.processors_out[i] = 1;
 280                                 }
 281                         }
 282                 }
 283
 284                 {
 285                         register int i;
 286
 287                         i = 0;
 288                         do {
 289                                 if (!cpu_isset(i, mask))
 290                                         continue;
 291                                 while(!ccall_info.processors_in[i])
 292                                         barrier();
 293                         } while(++i < ncpus);
 294
 295                         i = 0;
 296                         do {
 297                                 if (!cpu_isset(i, mask))
 298                                         continue;
 299                                 while(!ccall_info.processors_out[i])
 300                                         barrier();
 301                         } while(++i < ncpus);
 302                 }
 303
 304                 spin_unlock_irqrestore(&cross_call_lock, flags);
 305 }
 306
 307 /* Running cross calls. */
 308 void smp4m_cross_call_irq(void)
 309 {
 310         int i = smp_processor_id();
 311
 312         ccall_info.processors_in[i] = 1;
 313         ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
 314                         ccall_info.arg4, ccall_info.arg5);
 315         ccall_info.processors_out[i] = 1;
 316 }
 317
 318 extern void sun4m_clear_profile_irq(int cpu);
 319
 320 void smp4m_percpu_timer_interrupt(struct pt_regs *regs)
 321 {
 322         struct pt_regs *old_regs;
 323         int cpu = smp_processor_id();
 324
 325         old_regs = set_irq_regs(regs);
 326
 327         sun4m_clear_profile_irq(cpu);
 328
 329         profile_tick(CPU_PROFILING);
 330
 331         if(!--prof_counter(cpu)) {
 332                 int user = user_mode(regs);
 333
 334                 irq_enter();
 335                 update_process_times(user);
 336                 irq_exit();
 337
 338                 prof_counter(cpu) = prof_multiplier(cpu);
 339         }
 340         set_irq_regs(old_regs);
 341 }
 342
 343 extern unsigned int lvl14_resolution;
 344
 345 static void __init smp_setup_percpu_timer(void)
 346 {
 347         int cpu = smp_processor_id();
 348
 349         prof_counter(cpu) = prof_multiplier(cpu) = 1;
 350         load_profile_irq(cpu, lvl14_resolution);
 351
 352         if(cpu == boot_cpu_id)
 353                 enable_pil_irq(14);
 354 }
 355
 356 static void __init smp4m_blackbox_id(unsigned *addr)
 357 {
 358         int rd = *addr & 0x3e000000;
 359         int rs1 = rd >> 11;
 360
 361         addr[0] = 0x81580000 | rd;              /* rd %tbr, reg */
 362         addr[1] = 0x8130200c | rd | rs1;        /* srl reg, 0xc, reg */
 363         addr[2] = 0x80082003 | rd | rs1;        /* and reg, 3, reg */
 364 }
 365
 366 static void __init smp4m_blackbox_current(unsigned *addr)
 367 {
 368         int rd = *addr & 0x3e000000;
 369         int rs1 = rd >> 11;
 370
 371         addr[0] = 0x81580000 | rd;              /* rd %tbr, reg */
 372         addr[2] = 0x8130200a | rd | rs1;        /* srl reg, 0xa, reg */
 373         addr[4] = 0x8008200c | rd | rs1;        /* and reg, 0xc, reg */
 374 }
 375
 376 void __init sun4m_init_smp(void)
 377 {
 378         BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4m_blackbox_id);
 379         BTFIXUPSET_BLACKBOX(load_current, smp4m_blackbox_current);
 380         BTFIXUPSET_CALL(smp_cross_call, smp4m_cross_call, BTFIXUPCALL_NORM);
 381         BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4m_processor_id, BTFIXUPCALL_NORM);
 382 }