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Linux/arch/s390/kernel/processor.c

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  1 /*
  2  *  Copyright IBM Corp. 2008
  3  *  Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
  4  */
  5 
  6 #define KMSG_COMPONENT "cpu"
  7 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  8 
  9 #include <linux/kernel.h>
 10 #include <linux/init.h>
 11 #include <linux/smp.h>
 12 #include <linux/seq_file.h>
 13 #include <linux/delay.h>
 14 #include <linux/cpu.h>
 15 #include <asm/elf.h>
 16 #include <asm/lowcore.h>
 17 #include <asm/param.h>
 18 
 19 static DEFINE_PER_CPU(struct cpuid, cpu_id);
 20 
 21 /*
 22  * cpu_init - initializes state that is per-CPU.
 23  */
 24 void cpu_init(void)
 25 {
 26         struct s390_idle_data *idle = &__get_cpu_var(s390_idle);
 27         struct cpuid *id = &__get_cpu_var(cpu_id);
 28 
 29         get_cpu_id(id);
 30         atomic_inc(&init_mm.mm_count);
 31         current->active_mm = &init_mm;
 32         BUG_ON(current->mm);
 33         enter_lazy_tlb(&init_mm, current);
 34         memset(idle, 0, sizeof(*idle));
 35 }
 36 
 37 /*
 38  * show_cpuinfo - Get information on one CPU for use by procfs.
 39  */
 40 static int show_cpuinfo(struct seq_file *m, void *v)
 41 {
 42         static const char *hwcap_str[] = {
 43                 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
 44                 "edat", "etf3eh", "highgprs", "te"
 45         };
 46         unsigned long n = (unsigned long) v - 1;
 47         int i;
 48 
 49         if (!n) {
 50                 s390_adjust_jiffies();
 51                 seq_printf(m, "vendor_id       : IBM/S390\n"
 52                            "# processors    : %i\n"
 53                            "bogomips per cpu: %lu.%02lu\n",
 54                            num_online_cpus(), loops_per_jiffy/(500000/HZ),
 55                            (loops_per_jiffy/(5000/HZ))%100);
 56                 seq_puts(m, "features\t: ");
 57                 for (i = 0; i < ARRAY_SIZE(hwcap_str); i++)
 58                         if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
 59                                 seq_printf(m, "%s ", hwcap_str[i]);
 60                 seq_puts(m, "\n");
 61                 show_cacheinfo(m);
 62         }
 63         get_online_cpus();
 64         if (cpu_online(n)) {
 65                 struct cpuid *id = &per_cpu(cpu_id, n);
 66                 seq_printf(m, "processor %li: "
 67                            "version = %02X,  "
 68                            "identification = %06X,  "
 69                            "machine = %04X\n",
 70                            n, id->version, id->ident, id->machine);
 71         }
 72         put_online_cpus();
 73         return 0;
 74 }
 75 
 76 static void *c_start(struct seq_file *m, loff_t *pos)
 77 {
 78         return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
 79 }
 80 
 81 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 82 {
 83         ++*pos;
 84         return c_start(m, pos);
 85 }
 86 
 87 static void c_stop(struct seq_file *m, void *v)
 88 {
 89 }
 90 
 91 const struct seq_operations cpuinfo_op = {
 92         .start  = c_start,
 93         .next   = c_next,
 94         .stop   = c_stop,
 95         .show   = show_cpuinfo,
 96 };
 97 
 98 

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