arch/sparc/kernel/smp.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
  36 int smp_num_cpus = 1;
  37 volatile unsigned long cpu_callin_map[NR_CPUS] __initdata = {0,};
  38 unsigned char boot_cpu_id = 0;
  39 unsigned char boot_cpu_id4 = 0; /* boot_cpu_id << 2 */
  40 int smp_activated = 0;
  41 volatile int __cpu_number_map[NR_CPUS];
  42 volatile int __cpu_logical_map[NR_CPUS];
  43
  44 cpumask_t cpu_online_map = CPU_MASK_NONE;
  45 cpumask_t phys_cpu_present_map = CPU_MASK_NONE;
  46 cpumask_t smp_commenced_mask = CPU_MASK_NONE;
  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 /* Used to make bitops atomic */
  57 unsigned char bitops_spinlock = 0;
  58
  59 void __cpuinit smp_store_cpu_info(int id)
  60 {
  61         int cpu_node;
  62
  63         cpu_data(id).udelay_val = loops_per_jiffy;
  64
  65         cpu_find_by_mid(id, &cpu_node);
  66         cpu_data(id).clock_tick = prom_getintdefault(cpu_node,
  67                                                      "clock-frequency", 0);
  68         cpu_data(id).prom_node = cpu_node;
  69         cpu_data(id).mid = cpu_get_hwmid(cpu_node);
  70
  71         /* this is required to tune the scheduler correctly */
  72         /* is it possible to have CPUs with different cache sizes? */
  73         if (id == boot_cpu_id) {
  74                 int cache_line,cache_nlines;
  75                 cache_line = 0x20;
  76                 cache_line = prom_getintdefault(cpu_node, "ecache-line-size", cache_line);
  77                 cache_nlines = 0x8000;
  78                 cache_nlines = prom_getintdefault(cpu_node, "ecache-nlines", cache_nlines);
  79                 max_cache_size = cache_line * cache_nlines;
  80         }
  81         if (cpu_data(id).mid < 0)
  82                 panic("No MID found for CPU%d at node 0x%08d", id, cpu_node);
  83 }
  84
  85 void __init smp_cpus_done(unsigned int max_cpus)
  86 {
  87         extern void smp4m_smp_done(void);
  88         extern void smp4d_smp_done(void);
  89         unsigned long bogosum = 0;
  90         int cpu, num;
  91
  92         for (cpu = 0, num = 0; cpu < NR_CPUS; cpu++)
  93                 if (cpu_online(cpu)) {
  94                         num++;
  95                         bogosum += cpu_data(cpu).udelay_val;
  96                 }
  97
  98         printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
  99                 num, bogosum/(500000/HZ),
 100                 (bogosum/(5000/HZ))%100);
 101
 102         switch(sparc_cpu_model) {
 103         case sun4:
 104                 printk("SUN4\n");
 105                 BUG();
 106                 break;
 107         case sun4c:
 108                 printk("SUN4C\n");
 109                 BUG();
 110                 break;
 111         case sun4m:
 112                 smp4m_smp_done();
 113                 break;
 114         case sun4d:
 115                 smp4d_smp_done();
 116                 break;
 117         case sun4e:
 118                 printk("SUN4E\n");
 119                 BUG();
 120                 break;
 121         case sun4u:
 122                 printk("SUN4U\n");
 123                 BUG();
 124                 break;
 125         default:
 126                 printk("UNKNOWN!\n");
 127                 BUG();
 128                 break;
 129         };
 130 }
 131
 132 void cpu_panic(void)
 133 {
 134         printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id());
 135         panic("SMP bolixed\n");
 136 }
 137
 138 struct linux_prom_registers smp_penguin_ctable __initdata = { 0 };
 139
 140 void smp_send_reschedule(int cpu)
 141 {
 142         /* See sparc64 */
 143 }
 144
 145 void smp_send_stop(void)
 146 {
 147 }
 148
 149 void smp_flush_cache_all(void)
 150 {
 151         xc0((smpfunc_t) BTFIXUP_CALL(local_flush_cache_all));
 152         local_flush_cache_all();
 153 }
 154
 155 void smp_flush_tlb_all(void)
 156 {
 157         xc0((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_all));
 158         local_flush_tlb_all();
 159 }
 160
 161 void smp_flush_cache_mm(struct mm_struct *mm)
 162 {
 163         if(mm->context != NO_CONTEXT) {
 164                 cpumask_t cpu_mask = mm->cpu_vm_mask;
 165                 cpu_clear(smp_processor_id(), cpu_mask);
 166                 if (!cpus_empty(cpu_mask))
 167                         xc1((smpfunc_t) BTFIXUP_CALL(local_flush_cache_mm), (unsigned long) mm);
 168                 local_flush_cache_mm(mm);
 169         }
 170 }
 171
 172 void smp_flush_tlb_mm(struct mm_struct *mm)
 173 {
 174         if(mm->context != NO_CONTEXT) {
 175                 cpumask_t cpu_mask = mm->cpu_vm_mask;
 176                 cpu_clear(smp_processor_id(), cpu_mask);
 177                 if (!cpus_empty(cpu_mask)) {
 178                         xc1((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_mm), (unsigned long) mm);
 179                         if(atomic_read(&mm->mm_users) == 1 && current->active_mm == mm)
 180                                 mm->cpu_vm_mask = cpumask_of_cpu(smp_processor_id());
 181                 }
 182                 local_flush_tlb_mm(mm);
 183         }
 184 }
 185
 186 void smp_flush_cache_range(struct vm_area_struct *vma, unsigned long start,
 187                            unsigned long end)
 188 {
 189         struct mm_struct *mm = vma->vm_mm;
 190
 191         if (mm->context != NO_CONTEXT) {
 192                 cpumask_t cpu_mask = mm->cpu_vm_mask;
 193                 cpu_clear(smp_processor_id(), cpu_mask);
 194                 if (!cpus_empty(cpu_mask))
 195                         xc3((smpfunc_t) BTFIXUP_CALL(local_flush_cache_range), (unsigned long) vma, start, end);
 196                 local_flush_cache_range(vma, start, end);
 197         }
 198 }
 199
 200 void smp_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
 201                          unsigned long end)
 202 {
 203         struct mm_struct *mm = vma->vm_mm;
 204
 205         if (mm->context != NO_CONTEXT) {
 206                 cpumask_t cpu_mask = mm->cpu_vm_mask;
 207                 cpu_clear(smp_processor_id(), cpu_mask);
 208                 if (!cpus_empty(cpu_mask))
 209                         xc3((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_range), (unsigned long) vma, start, end);
 210                 local_flush_tlb_range(vma, start, end);
 211         }
 212 }
 213
 214 void smp_flush_cache_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->cpu_vm_mask;
 220                 cpu_clear(smp_processor_id(), cpu_mask);
 221                 if (!cpus_empty(cpu_mask))
 222                         xc2((smpfunc_t) BTFIXUP_CALL(local_flush_cache_page), (unsigned long) vma, page);
 223                 local_flush_cache_page(vma, page);
 224         }
 225 }
 226
 227 void smp_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
 228 {
 229         struct mm_struct *mm = vma->vm_mm;
 230
 231         if(mm->context != NO_CONTEXT) {
 232                 cpumask_t cpu_mask = mm->cpu_vm_mask;
 233                 cpu_clear(smp_processor_id(), cpu_mask);
 234                 if (!cpus_empty(cpu_mask))
 235                         xc2((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_page), (unsigned long) vma, page);
 236                 local_flush_tlb_page(vma, page);
 237         }
 238 }
 239
 240 void smp_reschedule_irq(void)
 241 {
 242         set_need_resched();
 243 }
 244
 245 void smp_flush_page_to_ram(unsigned long page)
 246 {
 247         /* Current theory is that those who call this are the one's
 248          * who have just dirtied their cache with the pages contents
 249          * in kernel space, therefore we only run this on local cpu.
 250          *
 251          * XXX This experiment failed, research further... -DaveM
 252          */
 253 #if 1
 254         xc1((smpfunc_t) BTFIXUP_CALL(local_flush_page_to_ram), page);
 255 #endif
 256         local_flush_page_to_ram(page);
 257 }
 258
 259 void smp_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr)
 260 {
 261         cpumask_t cpu_mask = mm->cpu_vm_mask;
 262         cpu_clear(smp_processor_id(), cpu_mask);
 263         if (!cpus_empty(cpu_mask))
 264                 xc2((smpfunc_t) BTFIXUP_CALL(local_flush_sig_insns), (unsigned long) mm, insn_addr);
 265         local_flush_sig_insns(mm, insn_addr);
 266 }
 267
 268 extern unsigned int lvl14_resolution;
 269
 270 /* /proc/profile writes can call this, don't __init it please. */
 271 static DEFINE_SPINLOCK(prof_setup_lock);
 272
 273 int setup_profiling_timer(unsigned int multiplier)
 274 {
 275         int i;
 276         unsigned long flags;
 277
 278         /* Prevent level14 ticker IRQ flooding. */
 279         if((!multiplier) || (lvl14_resolution / multiplier) < 500)
 280                 return -EINVAL;
 281
 282         spin_lock_irqsave(&prof_setup_lock, flags);
 283         for_each_possible_cpu(i) {
 284                 load_profile_irq(i, lvl14_resolution / multiplier);
 285                 prof_multiplier(i) = multiplier;
 286         }
 287         spin_unlock_irqrestore(&prof_setup_lock, flags);
 288
 289         return 0;
 290 }
 291
 292 void __init smp_prepare_cpus(unsigned int max_cpus)
 293 {
 294         extern void __init smp4m_boot_cpus(void);
 295         extern void __init smp4d_boot_cpus(void);
 296         int i, cpuid, extra;
 297
 298         printk("Entering SMP Mode...\n");
 299
 300         extra = 0;
 301         for (i = 0; !cpu_find_by_instance(i, NULL, &cpuid); i++) {
 302                 if (cpuid >= NR_CPUS)
 303                         extra++;
 304         }
 305         /* i = number of cpus */
 306         if (extra && max_cpus > i - extra)
 307                 printk("Warning: NR_CPUS is too low to start all cpus\n");
 308
 309         smp_store_cpu_info(boot_cpu_id);
 310
 311         switch(sparc_cpu_model) {
 312         case sun4:
 313                 printk("SUN4\n");
 314                 BUG();
 315                 break;
 316         case sun4c:
 317                 printk("SUN4C\n");
 318                 BUG();
 319                 break;
 320         case sun4m:
 321                 smp4m_boot_cpus();
 322                 break;
 323         case sun4d:
 324                 smp4d_boot_cpus();
 325                 break;
 326         case sun4e:
 327                 printk("SUN4E\n");
 328                 BUG();
 329                 break;
 330         case sun4u:
 331                 printk("SUN4U\n");
 332                 BUG();
 333                 break;
 334         default:
 335                 printk("UNKNOWN!\n");
 336                 BUG();
 337                 break;
 338         };
 339 }
 340
 341 /* Set this up early so that things like the scheduler can init
 342  * properly.  We use the same cpu mask for both the present and
 343  * possible cpu map.
 344  */
 345 void __init smp_setup_cpu_possible_map(void)
 346 {
 347         int instance, mid;
 348
 349         instance = 0;
 350         while (!cpu_find_by_instance(instance, NULL, &mid)) {
 351                 if (mid < NR_CPUS) {
 352                         cpu_set(mid, phys_cpu_present_map);
 353                         cpu_set(mid, cpu_present_map);
 354                 }
 355                 instance++;
 356         }
 357 }
 358
 359 void __init smp_prepare_boot_cpu(void)
 360 {
 361         int cpuid = hard_smp_processor_id();
 362
 363         if (cpuid >= NR_CPUS) {
 364                 prom_printf("Serious problem, boot cpu id >= NR_CPUS\n");
 365                 prom_halt();
 366         }
 367         if (cpuid != 0)
 368                 printk("boot cpu id != 0, this could work but is untested\n");
 369
 370         current_thread_info()->cpu = cpuid;
 371         cpu_set(cpuid, cpu_online_map);
 372         cpu_set(cpuid, phys_cpu_present_map);
 373 }
 374
 375 int __cpuinit __cpu_up(unsigned int cpu)
 376 {
 377         extern int __cpuinit smp4m_boot_one_cpu(int);
 378         extern int __cpuinit smp4d_boot_one_cpu(int);
 379         int ret=0;
 380
 381         switch(sparc_cpu_model) {
 382         case sun4:
 383                 printk("SUN4\n");
 384                 BUG();
 385                 break;
 386         case sun4c:
 387                 printk("SUN4C\n");
 388                 BUG();
 389                 break;
 390         case sun4m:
 391                 ret = smp4m_boot_one_cpu(cpu);
 392                 break;
 393         case sun4d:
 394                 ret = smp4d_boot_one_cpu(cpu);
 395                 break;
 396         case sun4e:
 397                 printk("SUN4E\n");
 398                 BUG();
 399                 break;
 400         case sun4u:
 401                 printk("SUN4U\n");
 402                 BUG();
 403                 break;
 404         default:
 405                 printk("UNKNOWN!\n");
 406                 BUG();
 407                 break;
 408         };
 409
 410         if (!ret) {
 411                 cpu_set(cpu, smp_commenced_mask);
 412                 while (!cpu_online(cpu))
 413                         mb();
 414         }
 415         return ret;
 416 }
 417
 418 void smp_bogo(struct seq_file *m)
 419 {
 420         int i;
 421
 422         for_each_online_cpu(i) {
 423                 seq_printf(m,
 424                            "Cpu%dBogo\t: %lu.%02lu\n",
 425                            i,
 426                            cpu_data(i).udelay_val/(500000/HZ),
 427                            (cpu_data(i).udelay_val/(5000/HZ))%100);
 428         }
 429 }
 430
 431 void smp_info(struct seq_file *m)
 432 {
 433         int i;
 434
 435         seq_printf(m, "State:\n");
 436         for_each_online_cpu(i)
 437                 seq_printf(m, "CPU%d\t\t: online\n", i);
 438 }