arch/sparc/kernel/smp_32.c

   1 /* smp.c: Sparc SMP support.
   2  *
   3  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
   4  * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   5  * Copyright (C) 2004 Keith M Wesolowski (wesolows@foobazco.org)
   6  */
   7
   8 #include <asm/head.h>
   9
  10 #include <linux/kernel.h>
  11 #include <linux/sched.h>
  12 #include <linux/threads.h>
  13 #include <linux/smp.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/kernel_stat.h>
  16 #include <linux/init.h>
  17 #include <linux/spinlock.h>
  18 #include <linux/mm.h>
  19 #include <linux/fs.h>
  20 #include <linux/seq_file.h>
  21 #include <linux/cache.h>
  22 #include <linux/delay.h>
  23 #include <linux/profile.h>
  24 #include <linux/cpu.h>
  25
  26 #include <asm/ptrace.h>
  27 #include <linux/atomic.h>
  28
  29 #include <asm/irq.h>
  30 #include <asm/page.h>
  31 #include <asm/pgalloc.h>
  32 #include <asm/pgtable.h>
  33 #include <asm/oplib.h>
  34 #include <asm/cacheflush.h>
  35 #include <asm/tlbflush.h>
  36 #include <asm/cpudata.h>
  37 #include <asm/timer.h>
  38 #include <asm/leon.h>
  39
  40 #include "kernel.h"
  41 #include "irq.h"
  42
  43 volatile unsigned long cpu_callin_map[NR_CPUS] = {0,};
  44
  45 cpumask_t smp_commenced_mask = CPU_MASK_NONE;
  46
  47 const struct sparc32_ipi_ops *sparc32_ipi_ops;
  48
  49 /* The only guaranteed locking primitive available on all Sparc
  50  * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically
  51  * places the current byte at the effective address into dest_reg and
  52  * places 0xff there afterwards.  Pretty lame locking primitive
  53  * compared to the Alpha and the Intel no?  Most Sparcs have 'swap'
  54  * instruction which is much better...
  55  */
  56
  57 void smp_store_cpu_info(int id)
  58 {
  59         int cpu_node;
  60         int mid;
  61
  62         cpu_data(id).udelay_val = loops_per_jiffy;
  63
  64         cpu_find_by_mid(id, &cpu_node);
  65         cpu_data(id).clock_tick = prom_getintdefault(cpu_node,
  66                                                      "clock-frequency", 0);
  67         cpu_data(id).prom_node = cpu_node;
  68         mid = cpu_get_hwmid(cpu_node);
  69
  70         if (mid < 0) {
  71                 printk(KERN_NOTICE "No MID found for CPU%d at node 0x%08x", id, cpu_node);
  72                 mid = 0;
  73         }
  74         cpu_data(id).mid = mid;
  75 }
  76
  77 void __init smp_cpus_done(unsigned int max_cpus)
  78 {
  79         unsigned long bogosum = 0;
  80         int cpu, num = 0;
  81
  82         for_each_online_cpu(cpu) {
  83                 num++;
  84                 bogosum += cpu_data(cpu).udelay_val;
  85         }
  86
  87         printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
  88                 num, bogosum/(500000/HZ),
  89                 (bogosum/(5000/HZ))%100);
  90
  91         switch(sparc_cpu_model) {
  92         case sun4m:
  93                 smp4m_smp_done();
  94                 break;
  95         case sun4d:
  96                 smp4d_smp_done();
  97                 break;
  98         case sparc_leon:
  99                 leon_smp_done();
 100                 break;
 101         case sun4e:
 102                 printk("SUN4E\n");
 103                 BUG();
 104                 break;
 105         case sun4u:
 106                 printk("SUN4U\n");
 107                 BUG();
 108                 break;
 109         default:
 110                 printk("UNKNOWN!\n");
 111                 BUG();
 112                 break;
 113         }
 114 }
 115
 116 void cpu_panic(void)
 117 {
 118         printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id());
 119         panic("SMP bolixed\n");
 120 }
 121
 122 struct linux_prom_registers smp_penguin_ctable = { 0 };
 123
 124 void smp_send_reschedule(int cpu)
 125 {
 126         /*
 127          * CPU model dependent way of implementing IPI generation targeting
 128          * a single CPU. The trap handler needs only to do trap entry/return
 129          * to call schedule.
 130          */
 131         sparc32_ipi_ops->resched(cpu);
 132 }
 133
 134 void smp_send_stop(void)
 135 {
 136 }
 137
 138 void arch_send_call_function_single_ipi(int cpu)
 139 {
 140         /* trigger one IPI single call on one CPU */
 141         sparc32_ipi_ops->single(cpu);
 142 }
 143
 144 void arch_send_call_function_ipi_mask(const struct cpumask *mask)
 145 {
 146         int cpu;
 147
 148         /* trigger IPI mask call on each CPU */
 149         for_each_cpu(cpu, mask)
 150                 sparc32_ipi_ops->mask_one(cpu);
 151 }
 152
 153 void smp_resched_interrupt(void)
 154 {
 155         irq_enter();
 156         scheduler_ipi();
 157         local_cpu_data().irq_resched_count++;
 158         irq_exit();
 159         /* re-schedule routine called by interrupt return code. */
 160 }
 161
 162 void smp_call_function_single_interrupt(void)
 163 {
 164         irq_enter();
 165         generic_smp_call_function_single_interrupt();
 166         local_cpu_data().irq_call_count++;
 167         irq_exit();
 168 }
 169
 170 void smp_call_function_interrupt(void)
 171 {
 172         irq_enter();
 173         generic_smp_call_function_interrupt();
 174         local_cpu_data().irq_call_count++;
 175         irq_exit();
 176 }
 177
 178 int setup_profiling_timer(unsigned int multiplier)
 179 {
 180         return -EINVAL;
 181 }
 182
 183 void __init smp_prepare_cpus(unsigned int max_cpus)
 184 {
 185         int i, cpuid, extra;
 186
 187         printk("Entering SMP Mode...\n");
 188
 189         extra = 0;
 190         for (i = 0; !cpu_find_by_instance(i, NULL, &cpuid); i++) {
 191                 if (cpuid >= NR_CPUS)
 192                         extra++;
 193         }
 194         /* i = number of cpus */
 195         if (extra && max_cpus > i - extra)
 196                 printk("Warning: NR_CPUS is too low to start all cpus\n");
 197
 198         smp_store_cpu_info(boot_cpu_id);
 199
 200         switch(sparc_cpu_model) {
 201         case sun4m:
 202                 smp4m_boot_cpus();
 203                 break;
 204         case sun4d:
 205                 smp4d_boot_cpus();
 206                 break;
 207         case sparc_leon:
 208                 leon_boot_cpus();
 209                 break;
 210         case sun4e:
 211                 printk("SUN4E\n");
 212                 BUG();
 213                 break;
 214         case sun4u:
 215                 printk("SUN4U\n");
 216                 BUG();
 217                 break;
 218         default:
 219                 printk("UNKNOWN!\n");
 220                 BUG();
 221                 break;
 222         }
 223 }
 224
 225 /* Set this up early so that things like the scheduler can init
 226  * properly.  We use the same cpu mask for both the present and
 227  * possible cpu map.
 228  */
 229 void __init smp_setup_cpu_possible_map(void)
 230 {
 231         int instance, mid;
 232
 233         instance = 0;
 234         while (!cpu_find_by_instance(instance, NULL, &mid)) {
 235                 if (mid < NR_CPUS) {
 236                         set_cpu_possible(mid, true);
 237                         set_cpu_present(mid, true);
 238                 }
 239                 instance++;
 240         }
 241 }
 242
 243 void __init smp_prepare_boot_cpu(void)
 244 {
 245         int cpuid = hard_smp_processor_id();
 246
 247         if (cpuid >= NR_CPUS) {
 248                 prom_printf("Serious problem, boot cpu id >= NR_CPUS\n");
 249                 prom_halt();
 250         }
 251         if (cpuid != 0)
 252                 printk("boot cpu id != 0, this could work but is untested\n");
 253
 254         current_thread_info()->cpu = cpuid;
 255         set_cpu_online(cpuid, true);
 256         set_cpu_possible(cpuid, true);
 257 }
 258
 259 int __cpu_up(unsigned int cpu, struct task_struct *tidle)
 260 {
 261         int ret=0;
 262
 263         switch(sparc_cpu_model) {
 264         case sun4m:
 265                 ret = smp4m_boot_one_cpu(cpu, tidle);
 266                 break;
 267         case sun4d:
 268                 ret = smp4d_boot_one_cpu(cpu, tidle);
 269                 break;
 270         case sparc_leon:
 271                 ret = leon_boot_one_cpu(cpu, tidle);
 272                 break;
 273         case sun4e:
 274                 printk("SUN4E\n");
 275                 BUG();
 276                 break;
 277         case sun4u:
 278                 printk("SUN4U\n");
 279                 BUG();
 280                 break;
 281         default:
 282                 printk("UNKNOWN!\n");
 283                 BUG();
 284                 break;
 285         }
 286
 287         if (!ret) {
 288                 cpumask_set_cpu(cpu, &smp_commenced_mask);
 289                 while (!cpu_online(cpu))
 290                         mb();
 291         }
 292         return ret;
 293 }
 294
 295 static void arch_cpu_pre_starting(void *arg)
 296 {
 297         local_ops->cache_all();
 298         local_ops->tlb_all();
 299
 300         switch(sparc_cpu_model) {
 301         case sun4m:
 302                 sun4m_cpu_pre_starting(arg);
 303                 break;
 304         case sun4d:
 305                 sun4d_cpu_pre_starting(arg);
 306                 break;
 307         case sparc_leon:
 308                 leon_cpu_pre_starting(arg);
 309                 break;
 310         default:
 311                 BUG();
 312         }
 313 }
 314
 315 static void arch_cpu_pre_online(void *arg)
 316 {
 317         unsigned int cpuid = hard_smp_processor_id();
 318
 319         register_percpu_ce(cpuid);
 320
 321         calibrate_delay();
 322         smp_store_cpu_info(cpuid);
 323
 324         local_ops->cache_all();
 325         local_ops->tlb_all();
 326
 327         switch(sparc_cpu_model) {
 328         case sun4m:
 329                 sun4m_cpu_pre_online(arg);
 330                 break;
 331         case sun4d:
 332                 sun4d_cpu_pre_online(arg);
 333                 break;
 334         case sparc_leon:
 335                 leon_cpu_pre_online(arg);
 336                 break;
 337         default:
 338                 BUG();
 339         }
 340 }
 341
 342 static void sparc_start_secondary(void *arg)
 343 {
 344         unsigned int cpu;
 345
 346         /*
 347          * SMP booting is extremely fragile in some architectures. So run
 348          * the cpu initialization code first before anything else.
 349          */
 350         arch_cpu_pre_starting(arg);
 351
 352         preempt_disable();
 353         cpu = smp_processor_id();
 354
 355         /* Invoke the CPU_STARTING notifier callbacks */
 356         notify_cpu_starting(cpu);
 357
 358         arch_cpu_pre_online(arg);
 359
 360         /* Set the CPU in the cpu_online_mask */
 361         set_cpu_online(cpu, true);
 362
 363         /* Enable local interrupts now */
 364         local_irq_enable();
 365
 366         wmb();
 367         cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
 368
 369         /* We should never reach here! */
 370         BUG();
 371 }
 372
 373 void smp_callin(void)
 374 {
 375         sparc_start_secondary(NULL);
 376 }
 377
 378 void smp_bogo(struct seq_file *m)
 379 {
 380         int i;
 381
 382         for_each_online_cpu(i) {
 383                 seq_printf(m,
 384                            "Cpu%dBogo\t: %lu.%02lu\n",
 385                            i,
 386                            cpu_data(i).udelay_val/(500000/HZ),
 387                            (cpu_data(i).udelay_val/(5000/HZ))%100);
 388         }
 389 }
 390
 391 void smp_info(struct seq_file *m)
 392 {
 393         int i;
 394
 395         seq_printf(m, "State:\n");
 396         for_each_online_cpu(i)
 397                 seq_printf(m, "CPU%d\t\t: online\n", i);
 398 }