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 <linux/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
  41 cpumask_t smp_commenced_mask = CPU_MASK_NONE;
  42
  43 const struct sparc32_ipi_ops *sparc32_ipi_ops;
  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         int mid;
  57
  58         cpu_data(id).udelay_val = loops_per_jiffy;
  59
  60         cpu_find_by_mid(id, &cpu_node);
  61         cpu_data(id).clock_tick = prom_getintdefault(cpu_node,
  62                                                      "clock-frequency", 0);
  63         cpu_data(id).prom_node = cpu_node;
  64         mid = cpu_get_hwmid(cpu_node);
  65
  66         if (mid < 0) {
  67                 printk(KERN_NOTICE "No MID found for CPU%d at node 0x%08d", id, cpu_node);
  68                 mid = 0;
  69         }
  70         cpu_data(id).mid = mid;
  71 }
  72
  73 void __init smp_cpus_done(unsigned int max_cpus)
  74 {
  75         extern void smp4m_smp_done(void);
  76         extern void smp4d_smp_done(void);
  77         unsigned long bogosum = 0;
  78         int cpu, num = 0;
  79
  80         for_each_online_cpu(cpu) {
  81                 num++;
  82                 bogosum += cpu_data(cpu).udelay_val;
  83         }
  84
  85         printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
  86                 num, bogosum/(500000/HZ),
  87                 (bogosum/(5000/HZ))%100);
  88
  89         switch(sparc_cpu_model) {
  90         case sun4m:
  91                 smp4m_smp_done();
  92                 break;
  93         case sun4d:
  94                 smp4d_smp_done();
  95                 break;
  96         case sparc_leon:
  97                 leon_smp_done();
  98                 break;
  99         case sun4e:
 100                 printk("SUN4E\n");
 101                 BUG();
 102                 break;
 103         case sun4u:
 104                 printk("SUN4U\n");
 105                 BUG();
 106                 break;
 107         default:
 108                 printk("UNKNOWN!\n");
 109                 BUG();
 110                 break;
 111         }
 112 }
 113
 114 void cpu_panic(void)
 115 {
 116         printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id());
 117         panic("SMP bolixed\n");
 118 }
 119
 120 struct linux_prom_registers smp_penguin_ctable __cpuinitdata = { 0 };
 121
 122 void smp_send_reschedule(int cpu)
 123 {
 124         /*
 125          * CPU model dependent way of implementing IPI generation targeting
 126          * a single CPU. The trap handler needs only to do trap entry/return
 127          * to call schedule.
 128          */
 129         sparc32_ipi_ops->resched(cpu);
 130 }
 131
 132 void smp_send_stop(void)
 133 {
 134 }
 135
 136 void arch_send_call_function_single_ipi(int cpu)
 137 {
 138         /* trigger one IPI single call on one CPU */
 139         sparc32_ipi_ops->single(cpu);
 140 }
 141
 142 void arch_send_call_function_ipi_mask(const struct cpumask *mask)
 143 {
 144         int cpu;
 145
 146         /* trigger IPI mask call on each CPU */
 147         for_each_cpu(cpu, mask)
 148                 sparc32_ipi_ops->mask_one(cpu);
 149 }
 150
 151 void smp_resched_interrupt(void)
 152 {
 153         irq_enter();
 154         scheduler_ipi();
 155         local_cpu_data().irq_resched_count++;
 156         irq_exit();
 157         /* re-schedule routine called by interrupt return code. */
 158 }
 159
 160 void smp_call_function_single_interrupt(void)
 161 {
 162         irq_enter();
 163         generic_smp_call_function_single_interrupt();
 164         local_cpu_data().irq_call_count++;
 165         irq_exit();
 166 }
 167
 168 void smp_call_function_interrupt(void)
 169 {
 170         irq_enter();
 171         generic_smp_call_function_interrupt();
 172         local_cpu_data().irq_call_count++;
 173         irq_exit();
 174 }
 175
 176 int setup_profiling_timer(unsigned int multiplier)
 177 {
 178         return -EINVAL;
 179 }
 180
 181 void __init smp_prepare_cpus(unsigned int max_cpus)
 182 {
 183         extern void __init smp4m_boot_cpus(void);
 184         extern void __init smp4d_boot_cpus(void);
 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 __cpuinit __cpu_up(unsigned int cpu, struct task_struct *tidle)
 260 {
 261         extern int __cpuinit smp4m_boot_one_cpu(int, struct task_struct *);
 262         extern int __cpuinit smp4d_boot_one_cpu(int, struct task_struct *);
 263         int ret=0;
 264
 265         switch(sparc_cpu_model) {
 266         case sun4m:
 267                 ret = smp4m_boot_one_cpu(cpu, tidle);
 268                 break;
 269         case sun4d:
 270                 ret = smp4d_boot_one_cpu(cpu, tidle);
 271                 break;
 272         case sparc_leon:
 273                 ret = leon_boot_one_cpu(cpu, tidle);
 274                 break;
 275         case sun4e:
 276                 printk("SUN4E\n");
 277                 BUG();
 278                 break;
 279         case sun4u:
 280                 printk("SUN4U\n");
 281                 BUG();
 282                 break;
 283         default:
 284                 printk("UNKNOWN!\n");
 285                 BUG();
 286                 break;
 287         }
 288
 289         if (!ret) {
 290                 cpumask_set_cpu(cpu, &smp_commenced_mask);
 291                 while (!cpu_online(cpu))
 292                         mb();
 293         }
 294         return ret;
 295 }
 296
 297 void smp_bogo(struct seq_file *m)
 298 {
 299         int i;
 300
 301         for_each_online_cpu(i) {
 302                 seq_printf(m,
 303                            "Cpu%dBogo\t: %lu.%02lu\n",
 304                            i,
 305                            cpu_data(i).udelay_val/(500000/HZ),
 306                            (cpu_data(i).udelay_val/(5000/HZ))%100);
 307         }
 308 }
 309
 310 void smp_info(struct seq_file *m)
 311 {
 312         int i;
 313
 314         seq_printf(m, "State:\n");
 315         for_each_online_cpu(i)
 316                 seq_printf(m, "CPU%d\t\t: online\n", i);
 317 }