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
  24 #include <asm/ptrace.h>
  25 #include <asm/atomic.h>
  26
  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/cacheflush.h>
  33 #include <asm/tlbflush.h>
  34 #include <asm/cpudata.h>
  35 #include <asm/leon.h>
  36
  37 #include "irq.h"
  38
  39 volatile unsigned long cpu_callin_map[NR_CPUS] __cpuinitdata = {0,};
  40 unsigned char boot_cpu_id = 0;
  41 unsigned char boot_cpu_id4 = 0; /* boot_cpu_id << 2 */
  42
  43 cpumask_t smp_commenced_mask = CPU_MASK_NONE;
  44
  45 /* The only guaranteed locking primitive available on all Sparc
  46  * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically
  47  * places the current byte at the effective address into dest_reg and
  48  * places 0xff there afterwards.  Pretty lame locking primitive
  49  * compared to the Alpha and the Intel no?  Most Sparcs have 'swap'
  50  * instruction which is much better...
  51  */
  52
  53 void __cpuinit smp_store_cpu_info(int id)
  54 {
  55         int cpu_node;
  56
  57         cpu_data(id).udelay_val = loops_per_jiffy;
  58
  59         cpu_find_by_mid(id, &cpu_node);
  60         cpu_data(id).clock_tick = prom_getintdefault(cpu_node,
  61                                                      "clock-frequency", 0);
  62         cpu_data(id).prom_node = cpu_node;
  63         cpu_data(id).mid = cpu_get_hwmid(cpu_node);
  64
  65         if (cpu_data(id).mid < 0)
  66                 panic("No MID found for CPU%d at node 0x%08d", id, cpu_node);
  67 }
  68
  69 void __init smp_cpus_done(unsigned int max_cpus)
  70 {
  71         extern void smp4m_smp_done(void);
  72         extern void smp4d_smp_done(void);
  73         unsigned long bogosum = 0;
  74         int cpu, num = 0;
  75
  76         for_each_online_cpu(cpu) {
  77                 num++;
  78                 bogosum += cpu_data(cpu).udelay_val;
  79         }
  80
  81         printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
  82                 num, bogosum/(500000/HZ),
  83                 (bogosum/(5000/HZ))%100);
  84
  85         switch(sparc_cpu_model) {
  86         case sun4:
  87                 printk("SUN4\n");
  88                 BUG();
  89                 break;
  90         case sun4c:
  91                 printk("SUN4C\n");
  92                 BUG();
  93                 break;
  94         case sun4m:
  95                 smp4m_smp_done();
  96                 break;
  97         case sun4d:
  98                 smp4d_smp_done();
  99                 break;
 100         case sparc_leon:
 101                 leon_smp_done();
 102                 break;
 103         case sun4e:
 104                 printk("SUN4E\n");
 105                 BUG();
 106                 break;
 107         case sun4u:
 108                 printk("SUN4U\n");
 109                 BUG();
 110                 break;
 111         default:
 112                 printk("UNKNOWN!\n");
 113                 BUG();
 114                 break;
 115         };
 116 }
 117
 118 void cpu_panic(void)
 119 {
 120         printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id());
 121         panic("SMP bolixed\n");
 122 }
 123
 124 struct linux_prom_registers smp_penguin_ctable __cpuinitdata = { 0 };
 125
 126 void smp_send_reschedule(int cpu)
 127 {
 128         /* See sparc64 */
 129 }
 130
 131 void smp_send_stop(void)
 132 {
 133 }
 134
 135 void smp_flush_cache_all(void)
 136 {
 137         xc0((smpfunc_t) BTFIXUP_CALL(local_flush_cache_all));
 138         local_flush_cache_all();
 139 }
 140
 141 void smp_flush_tlb_all(void)
 142 {
 143         xc0((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_all));
 144         local_flush_tlb_all();
 145 }
 146
 147 void smp_flush_cache_mm(struct mm_struct *mm)
 148 {
 149         if(mm->context != NO_CONTEXT) {
 150                 cpumask_t cpu_mask = *mm_cpumask(mm);
 151                 cpu_clear(smp_processor_id(), cpu_mask);
 152                 if (!cpus_empty(cpu_mask))
 153                         xc1((smpfunc_t) BTFIXUP_CALL(local_flush_cache_mm), (unsigned long) mm);
 154                 local_flush_cache_mm(mm);
 155         }
 156 }
 157
 158 void smp_flush_tlb_mm(struct mm_struct *mm)
 159 {
 160         if(mm->context != NO_CONTEXT) {
 161                 cpumask_t cpu_mask = *mm_cpumask(mm);
 162                 cpu_clear(smp_processor_id(), cpu_mask);
 163                 if (!cpus_empty(cpu_mask)) {
 164                         xc1((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_mm), (unsigned long) mm);
 165                         if(atomic_read(&mm->mm_users) == 1 && current->active_mm == mm)
 166                                 cpumask_copy(mm_cpumask(mm),
 167                                              cpumask_of(smp_processor_id()));
 168                 }
 169                 local_flush_tlb_mm(mm);
 170         }
 171 }
 172
 173 void smp_flush_cache_range(struct vm_area_struct *vma, unsigned long start,
 174                            unsigned long end)
 175 {
 176         struct mm_struct *mm = vma->vm_mm;
 177
 178         if (mm->context != NO_CONTEXT) {
 179                 cpumask_t cpu_mask = *mm_cpumask(mm);
 180                 cpu_clear(smp_processor_id(), cpu_mask);
 181                 if (!cpus_empty(cpu_mask))
 182                         xc3((smpfunc_t) BTFIXUP_CALL(local_flush_cache_range), (unsigned long) vma, start, end);
 183                 local_flush_cache_range(vma, start, end);
 184         }
 185 }
 186
 187 void smp_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
 188                          unsigned long end)
 189 {
 190         struct mm_struct *mm = vma->vm_mm;
 191
 192         if (mm->context != NO_CONTEXT) {
 193                 cpumask_t cpu_mask = *mm_cpumask(mm);
 194                 cpu_clear(smp_processor_id(), cpu_mask);
 195                 if (!cpus_empty(cpu_mask))
 196                         xc3((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_range), (unsigned long) vma, start, end);
 197                 local_flush_tlb_range(vma, start, end);
 198         }
 199 }
 200
 201 void smp_flush_cache_page(struct vm_area_struct *vma, unsigned long page)
 202 {
 203         struct mm_struct *mm = vma->vm_mm;
 204
 205         if(mm->context != NO_CONTEXT) {
 206                 cpumask_t cpu_mask = *mm_cpumask(mm);
 207                 cpu_clear(smp_processor_id(), cpu_mask);
 208                 if (!cpus_empty(cpu_mask))
 209                         xc2((smpfunc_t) BTFIXUP_CALL(local_flush_cache_page), (unsigned long) vma, page);
 210                 local_flush_cache_page(vma, page);
 211         }
 212 }
 213
 214 void smp_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
 215 {
 216         struct mm_struct *mm = vma->vm_mm;
 217
 218         if(mm->context != NO_CONTEXT) {
 219                 cpumask_t cpu_mask = *mm_cpumask(mm);
 220                 cpu_clear(smp_processor_id(), cpu_mask);
 221                 if (!cpus_empty(cpu_mask))
 222                         xc2((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_page), (unsigned long) vma, page);
 223                 local_flush_tlb_page(vma, page);
 224         }
 225 }
 226
 227 void smp_reschedule_irq(void)
 228 {
 229         set_need_resched();
 230 }
 231
 232 void smp_flush_page_to_ram(unsigned long page)
 233 {
 234         /* Current theory is that those who call this are the one's
 235          * who have just dirtied their cache with the pages contents
 236          * in kernel space, therefore we only run this on local cpu.
 237          *
 238          * XXX This experiment failed, research further... -DaveM
 239          */
 240 #if 1
 241         xc1((smpfunc_t) BTFIXUP_CALL(local_flush_page_to_ram), page);
 242 #endif
 243         local_flush_page_to_ram(page);
 244 }
 245
 246 void smp_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr)
 247 {
 248         cpumask_t cpu_mask = *mm_cpumask(mm);
 249         cpu_clear(smp_processor_id(), cpu_mask);
 250         if (!cpus_empty(cpu_mask))
 251                 xc2((smpfunc_t) BTFIXUP_CALL(local_flush_sig_insns), (unsigned long) mm, insn_addr);
 252         local_flush_sig_insns(mm, insn_addr);
 253 }
 254
 255 extern unsigned int lvl14_resolution;
 256
 257 /* /proc/profile writes can call this, don't __init it please. */
 258 static DEFINE_SPINLOCK(prof_setup_lock);
 259
 260 int setup_profiling_timer(unsigned int multiplier)
 261 {
 262         int i;
 263         unsigned long flags;
 264
 265         /* Prevent level14 ticker IRQ flooding. */
 266         if((!multiplier) || (lvl14_resolution / multiplier) < 500)
 267                 return -EINVAL;
 268
 269         spin_lock_irqsave(&prof_setup_lock, flags);
 270         for_each_possible_cpu(i) {
 271                 load_profile_irq(i, lvl14_resolution / multiplier);
 272                 prof_multiplier(i) = multiplier;
 273         }
 274         spin_unlock_irqrestore(&prof_setup_lock, flags);
 275
 276         return 0;
 277 }
 278
 279 void __init smp_prepare_cpus(unsigned int max_cpus)
 280 {
 281         extern void __init smp4m_boot_cpus(void);
 282         extern void __init smp4d_boot_cpus(void);
 283         int i, cpuid, extra;
 284
 285         printk("Entering SMP Mode...\n");
 286
 287         extra = 0;
 288         for (i = 0; !cpu_find_by_instance(i, NULL, &cpuid); i++) {
 289                 if (cpuid >= NR_CPUS)
 290                         extra++;
 291         }
 292         /* i = number of cpus */
 293         if (extra && max_cpus > i - extra)
 294                 printk("Warning: NR_CPUS is too low to start all cpus\n");
 295
 296         smp_store_cpu_info(boot_cpu_id);
 297
 298         switch(sparc_cpu_model) {
 299         case sun4:
 300                 printk("SUN4\n");
 301                 BUG();
 302                 break;
 303         case sun4c:
 304                 printk("SUN4C\n");
 305                 BUG();
 306                 break;
 307         case sun4m:
 308                 smp4m_boot_cpus();
 309                 break;
 310         case sun4d:
 311                 smp4d_boot_cpus();
 312                 break;
 313         case sparc_leon:
 314                 leon_boot_cpus();
 315                 break;
 316         case sun4e:
 317                 printk("SUN4E\n");
 318                 BUG();
 319                 break;
 320         case sun4u:
 321                 printk("SUN4U\n");
 322                 BUG();
 323                 break;
 324         default:
 325                 printk("UNKNOWN!\n");
 326                 BUG();
 327                 break;
 328         };
 329 }
 330
 331 /* Set this up early so that things like the scheduler can init
 332  * properly.  We use the same cpu mask for both the present and
 333  * possible cpu map.
 334  */
 335 void __init smp_setup_cpu_possible_map(void)
 336 {
 337         int instance, mid;
 338
 339         instance = 0;
 340         while (!cpu_find_by_instance(instance, NULL, &mid)) {
 341                 if (mid < NR_CPUS) {
 342                         set_cpu_possible(mid, true);
 343                         set_cpu_present(mid, true);
 344                 }
 345                 instance++;
 346         }
 347 }
 348
 349 void __init smp_prepare_boot_cpu(void)
 350 {
 351         int cpuid = hard_smp_processor_id();
 352
 353         if (cpuid >= NR_CPUS) {
 354                 prom_printf("Serious problem, boot cpu id >= NR_CPUS\n");
 355                 prom_halt();
 356         }
 357         if (cpuid != 0)
 358                 printk("boot cpu id != 0, this could work but is untested\n");
 359
 360         current_thread_info()->cpu = cpuid;
 361         set_cpu_online(cpuid, true);
 362         set_cpu_possible(cpuid, true);
 363 }
 364
 365 int __cpuinit __cpu_up(unsigned int cpu)
 366 {
 367         extern int __cpuinit smp4m_boot_one_cpu(int);
 368         extern int __cpuinit smp4d_boot_one_cpu(int);
 369         int ret=0;
 370
 371         switch(sparc_cpu_model) {
 372         case sun4:
 373                 printk("SUN4\n");
 374                 BUG();
 375                 break;
 376         case sun4c:
 377                 printk("SUN4C\n");
 378                 BUG();
 379                 break;
 380         case sun4m:
 381                 ret = smp4m_boot_one_cpu(cpu);
 382                 break;
 383         case sun4d:
 384                 ret = smp4d_boot_one_cpu(cpu);
 385                 break;
 386         case sparc_leon:
 387                 ret = leon_boot_one_cpu(cpu);
 388                 break;
 389         case sun4e:
 390                 printk("SUN4E\n");
 391                 BUG();
 392                 break;
 393         case sun4u:
 394                 printk("SUN4U\n");
 395                 BUG();
 396                 break;
 397         default:
 398                 printk("UNKNOWN!\n");
 399                 BUG();
 400                 break;
 401         };
 402
 403         if (!ret) {
 404                 cpu_set(cpu, smp_commenced_mask);
 405                 while (!cpu_online(cpu))
 406                         mb();
 407         }
 408         return ret;
 409 }
 410
 411 void smp_bogo(struct seq_file *m)
 412 {
 413         int i;
 414
 415         for_each_online_cpu(i) {
 416                 seq_printf(m,
 417                            "Cpu%dBogo\t: %lu.%02lu\n",
 418                            i,
 419                            cpu_data(i).udelay_val/(500000/HZ),
 420                            (cpu_data(i).udelay_val/(5000/HZ))%100);
 421         }
 422 }
 423
 424 void smp_info(struct seq_file *m)
 425 {
 426         int i;
 427
 428         seq_printf(m, "State:\n");
 429         for_each_online_cpu(i)
 430                 seq_printf(m, "CPU%d\t\t: online\n", i);
 431 }