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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/seq_file.h>
 12 #include <linux/delay.h>
 13 #include <linux/cpu.h>
 14 #include <asm/elf.h>
 15 #include <asm/lowcore.h>
 16 #include <asm/param.h>
 17 #include <asm/smp.h>
 18 
 19 static DEFINE_PER_CPU(struct cpuid, cpu_id);
 20 
 21 void notrace cpu_relax(void)
 22 {
 23         if (!smp_cpu_mtid && MACHINE_HAS_DIAG44)
 24                 asm volatile("diag 0,0,0x44");
 25         barrier();
 26 }
 27 EXPORT_SYMBOL(cpu_relax);
 28 
 29 /*
 30  * cpu_init - initializes state that is per-CPU.
 31  */
 32 void cpu_init(void)
 33 {
 34         struct cpuid *id = this_cpu_ptr(&cpu_id);
 35 
 36         get_cpu_id(id);
 37         atomic_inc(&init_mm.mm_count);
 38         current->active_mm = &init_mm;
 39         BUG_ON(current->mm);
 40         enter_lazy_tlb(&init_mm, current);
 41 }
 42 
 43 /*
 44  * cpu_have_feature - Test CPU features on module initialization
 45  */
 46 int cpu_have_feature(unsigned int num)
 47 {
 48         return elf_hwcap & (1UL << num);
 49 }
 50 EXPORT_SYMBOL(cpu_have_feature);
 51 
 52 /*
 53  * show_cpuinfo - Get information on one CPU for use by procfs.
 54  */
 55 static int show_cpuinfo(struct seq_file *m, void *v)
 56 {
 57         static const char *hwcap_str[] = {
 58                 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
 59                 "edat", "etf3eh", "highgprs", "te", "vx"
 60         };
 61         unsigned long n = (unsigned long) v - 1;
 62         int i;
 63 
 64         if (!n) {
 65                 s390_adjust_jiffies();
 66                 seq_printf(m, "vendor_id       : IBM/S390\n"
 67                            "# processors    : %i\n"
 68                            "bogomips per cpu: %lu.%02lu\n",
 69                            num_online_cpus(), loops_per_jiffy/(500000/HZ),
 70                            (loops_per_jiffy/(5000/HZ))%100);
 71                 seq_puts(m, "features\t: ");
 72                 for (i = 0; i < ARRAY_SIZE(hwcap_str); i++)
 73                         if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
 74                                 seq_printf(m, "%s ", hwcap_str[i]);
 75                 seq_puts(m, "\n");
 76                 show_cacheinfo(m);
 77         }
 78         get_online_cpus();
 79         if (cpu_online(n)) {
 80                 struct cpuid *id = &per_cpu(cpu_id, n);
 81                 seq_printf(m, "processor %li: "
 82                            "version = %02X,  "
 83                            "identification = %06X,  "
 84                            "machine = %04X\n",
 85                            n, id->version, id->ident, id->machine);
 86         }
 87         put_online_cpus();
 88         return 0;
 89 }
 90 
 91 static void *c_start(struct seq_file *m, loff_t *pos)
 92 {
 93         return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
 94 }
 95 
 96 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 97 {
 98         ++*pos;
 99         return c_start(m, pos);
100 }
101 
102 static void c_stop(struct seq_file *m, void *v)
103 {
104 }
105 
106 const struct seq_operations cpuinfo_op = {
107         .start  = c_start,
108         .next   = c_next,
109         .stop   = c_stop,
110         .show   = show_cpuinfo,
111 };
112 
113 

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