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/cpu.h>
  24
  25 #include <asm/ptrace.h>
  26 #include <linux/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/cacheflush.h>
  34 #include <asm/tlbflush.h>
  35 #include <asm/cpudata.h>
  36 #include <asm/timer.h>
  37 #include <asm/leon.h>
  38
  39 #include "kernel.h"
  40 #include "irq.h"
  41
  42 volatile unsigned long cpu_callin_map[NR_CPUS] = {0,};
  43
  44 cpumask_t smp_commenced_mask = CPU_MASK_NONE;
  45
  46 const struct sparc32_ipi_ops *sparc32_ipi_ops;
  47
  48 /* The only guaranteed locking primitive available on all Sparc
  49  * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically
  50  * places the current byte at the effective address into dest_reg and
  51  * places 0xff there afterwards.  Pretty lame locking primitive
  52  * compared to the Alpha and the Intel no?  Most Sparcs have 'swap'
  53  * instruction which is much better...
  54  */
  55
  56 void smp_store_cpu_info(int id)
  57 {
  58         int cpu_node;
  59         int mid;
  60
  61         cpu_data(id).udelay_val = loops_per_jiffy;
  62
  63         cpu_find_by_mid(id, &cpu_node);
  64         cpu_data(id).clock_tick = prom_getintdefault(cpu_node,
  65                                                      "clock-frequency", 0);
  66         cpu_data(id).prom_node = cpu_node;
  67         mid = cpu_get_hwmid(cpu_node);
  68
  69         if (mid < 0) {
  70                 printk(KERN_NOTICE "No MID found for CPU%d at node 0x%08d", id, cpu_node);
  71                 mid = 0;
  72         }
  73         cpu_data(id).mid = mid;
  74 }
  75
  76 void __init smp_cpus_done(unsigned int max_cpus)
  77 {
  78         extern void smp4m_smp_done(void);
  79         extern void smp4d_smp_done(void);
  80         unsigned long bogosum = 0;
  81         int cpu, num = 0;
  82
  83         for_each_online_cpu(cpu) {
  84                 num++;
  85                 bogosum += cpu_data(cpu).udelay_val;
  86         }
  87
  88         printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
  89                 num, bogosum/(500000/HZ),
  90                 (bogosum/(5000/HZ))%100);
  91
  92         switch(sparc_cpu_model) {
  93         case sun4m:
  94                 smp4m_smp_done();
  95                 break;
  96         case sun4d:
  97                 smp4d_smp_done();
  98                 break;
  99         case sparc_leon:
 100                 leon_smp_done();
 101                 break;
 102         case sun4e:
 103                 printk("SUN4E\n");
 104                 BUG();
 105                 break;
 106         case sun4u:
 107                 printk("SUN4U\n");
 108                 BUG();
 109                 break;
 110         default:
 111                 printk("UNKNOWN!\n");
 112                 BUG();
 113                 break;
 114         }
 115 }
 116
 117 void cpu_panic(void)
 118 {
 119         printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id());
 120         panic("SMP bolixed\n");
 121 }
 122
 123 struct linux_prom_registers smp_penguin_ctable = { 0 };
 124
 125 void smp_send_reschedule(int cpu)
 126 {
 127         /*
 128          * CPU model dependent way of implementing IPI generation targeting
 129          * a single CPU. The trap handler needs only to do trap entry/return
 130          * to call schedule.
 131          */
 132         sparc32_ipi_ops->resched(cpu);
 133 }
 134
 135 void smp_send_stop(void)
 136 {
 137 }
 138
 139 void arch_send_call_function_single_ipi(int cpu)
 140 {
 141         /* trigger one IPI single call on one CPU */
 142         sparc32_ipi_ops->single(cpu);
 143 }
 144
 145 void arch_send_call_function_ipi_mask(const struct cpumask *mask)
 146 {
 147         int cpu;
 148
 149         /* trigger IPI mask call on each CPU */
 150         for_each_cpu(cpu, mask)
 151                 sparc32_ipi_ops->mask_one(cpu);
 152 }
 153
 154 void smp_resched_interrupt(void)
 155 {
 156         irq_enter();
 157         scheduler_ipi();
 158         local_cpu_data().irq_resched_count++;
 159         irq_exit();
 160         /* re-schedule routine called by interrupt return code. */
 161 }
 162
 163 void smp_call_function_single_interrupt(void)
 164 {
 165         irq_enter();
 166         generic_smp_call_function_single_interrupt();
 167         local_cpu_data().irq_call_count++;
 168         irq_exit();
 169 }
 170
 171 void smp_call_function_interrupt(void)
 172 {
 173         irq_enter();
 174         generic_smp_call_function_interrupt();
 175         local_cpu_data().irq_call_count++;
 176         irq_exit();
 177 }
 178
 179 int setup_profiling_timer(unsigned int multiplier)
 180 {
 181         return -EINVAL;
 182 }
 183
 184 void __init smp_prepare_cpus(unsigned int max_cpus)
 185 {
 186         extern void __init smp4m_boot_cpus(void);
 187         extern void __init smp4d_boot_cpus(void);
 188         int i, cpuid, extra;
 189
 190         printk("Entering SMP Mode...\n");
 191
 192         extra = 0;
 193         for (i = 0; !cpu_find_by_instance(i, NULL, &cpuid); i++) {
 194                 if (cpuid >= NR_CPUS)
 195                         extra++;
 196         }
 197         /* i = number of cpus */
 198         if (extra && max_cpus > i - extra)
 199                 printk("Warning: NR_CPUS is too low to start all cpus\n");
 200
 201         smp_store_cpu_info(boot_cpu_id);
 202
 203         switch(sparc_cpu_model) {
 204         case sun4m:
 205                 smp4m_boot_cpus();
 206                 break;
 207         case sun4d:
 208                 smp4d_boot_cpus();
 209                 break;
 210         case sparc_leon:
 211                 leon_boot_cpus();
 212                 break;
 213         case sun4e:
 214                 printk("SUN4E\n");
 215                 BUG();
 216                 break;
 217         case sun4u:
 218                 printk("SUN4U\n");
 219                 BUG();
 220                 break;
 221         default:
 222                 printk("UNKNOWN!\n");
 223                 BUG();
 224                 break;
 225         }
 226 }
 227
 228 /* Set this up early so that things like the scheduler can init
 229  * properly.  We use the same cpu mask for both the present and
 230  * possible cpu map.
 231  */
 232 void __init smp_setup_cpu_possible_map(void)
 233 {
 234         int instance, mid;
 235
 236         instance = 0;
 237         while (!cpu_find_by_instance(instance, NULL, &mid)) {
 238                 if (mid < NR_CPUS) {
 239                         set_cpu_possible(mid, true);
 240                         set_cpu_present(mid, true);
 241                 }
 242                 instance++;
 243         }
 244 }
 245
 246 void __init smp_prepare_boot_cpu(void)
 247 {
 248         int cpuid = hard_smp_processor_id();
 249
 250         if (cpuid >= NR_CPUS) {
 251                 prom_printf("Serious problem, boot cpu id >= NR_CPUS\n");
 252                 prom_halt();
 253         }
 254         if (cpuid != 0)
 255                 printk("boot cpu id != 0, this could work but is untested\n");
 256
 257         current_thread_info()->cpu = cpuid;
 258         set_cpu_online(cpuid, true);
 259         set_cpu_possible(cpuid, true);
 260 }
 261
 262 int __cpu_up(unsigned int cpu, struct task_struct *tidle)
 263 {
 264         extern int smp4m_boot_one_cpu(int, struct task_struct *);
 265         extern int smp4d_boot_one_cpu(int, struct task_struct *);
 266         int ret=0;
 267
 268         switch(sparc_cpu_model) {
 269         case sun4m:
 270                 ret = smp4m_boot_one_cpu(cpu, tidle);
 271                 break;
 272         case sun4d:
 273                 ret = smp4d_boot_one_cpu(cpu, tidle);
 274                 break;
 275         case sparc_leon:
 276                 ret = leon_boot_one_cpu(cpu, tidle);
 277                 break;
 278         case sun4e:
 279                 printk("SUN4E\n");
 280                 BUG();
 281                 break;
 282         case sun4u:
 283                 printk("SUN4U\n");
 284                 BUG();
 285                 break;
 286         default:
 287                 printk("UNKNOWN!\n");
 288                 BUG();
 289                 break;
 290         }
 291
 292         if (!ret) {
 293                 cpumask_set_cpu(cpu, &smp_commenced_mask);
 294                 while (!cpu_online(cpu))
 295                         mb();
 296         }
 297         return ret;
 298 }
 299
 300 void arch_cpu_pre_starting(void *arg)
 301 {
 302         local_ops->cache_all();
 303         local_ops->tlb_all();
 304
 305         switch(sparc_cpu_model) {
 306         case sun4m:
 307                 sun4m_cpu_pre_starting(arg);
 308                 break;
 309         case sun4d:
 310                 sun4d_cpu_pre_starting(arg);
 311                 break;
 312         case sparc_leon:
 313                 leon_cpu_pre_starting(arg);
 314                 break;
 315         default:
 316                 BUG();
 317         }
 318 }
 319
 320 void arch_cpu_pre_online(void *arg)
 321 {
 322         unsigned int cpuid = hard_smp_processor_id();
 323
 324         register_percpu_ce(cpuid);
 325
 326         calibrate_delay();
 327         smp_store_cpu_info(cpuid);
 328
 329         local_ops->cache_all();
 330         local_ops->tlb_all();
 331
 332         switch(sparc_cpu_model) {
 333         case sun4m:
 334                 sun4m_cpu_pre_online(arg);
 335                 break;
 336         case sun4d:
 337                 sun4d_cpu_pre_online(arg);
 338                 break;
 339         case sparc_leon:
 340                 leon_cpu_pre_online(arg);
 341                 break;
 342         default:
 343                 BUG();
 344         }
 345 }
 346
 347 void sparc_start_secondary(void *arg)
 348 {
 349         unsigned int cpu;
 350
 351         /*
 352          * SMP booting is extremely fragile in some architectures. So run
 353          * the cpu initialization code first before anything else.
 354          */
 355         arch_cpu_pre_starting(arg);
 356
 357         preempt_disable();
 358         cpu = smp_processor_id();
 359
 360         /* Invoke the CPU_STARTING notifier callbacks */
 361         notify_cpu_starting(cpu);
 362
 363         arch_cpu_pre_online(arg);
 364
 365         /* Set the CPU in the cpu_online_mask */
 366         set_cpu_online(cpu, true);
 367
 368         /* Enable local interrupts now */
 369         local_irq_enable();
 370
 371         wmb();
 372         cpu_startup_entry(CPUHP_ONLINE);
 373
 374         /* We should never reach here! */
 375         BUG();
 376 }
 377
 378 void smp_callin(void)
 379 {
 380         sparc_start_secondary(NULL);
 381 }
 382
 383 void smp_bogo(struct seq_file *m)
 384 {
 385         int i;
 386
 387         for_each_online_cpu(i) {
 388                 seq_printf(m,
 389                            "Cpu%dBogo\t: %lu.%02lu\n",
 390                            i,
 391                            cpu_data(i).udelay_val/(500000/HZ),
 392                            (cpu_data(i).udelay_val/(5000/HZ))%100);
 393         }
 394 }
 395
 396 void smp_info(struct seq_file *m)
 397 {
 398         int i;
 399
 400         seq_printf(m, "State:\n");
 401         for_each_online_cpu(i)
 402                 seq_printf(m, "CPU%d\t\t: online\n", i);
 403 }