2 * Copyright IBM Corp. 2008
3 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
6 #define KMSG_COMPONENT "cpu"
7 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
9 #include <linux/cpufeature.h>
10 #include <linux/kernel.h>
11 #include <linux/init.h>
12 #include <linux/seq_file.h>
13 #include <linux/delay.h>
14 #include <linux/cpu.h>
17 #include <asm/lowcore.h>
18 #include <asm/param.h>
21 static DEFINE_PER_CPU(struct cpuid, cpu_id);
23 void notrace cpu_relax(void)
25 if (!smp_cpu_mtid && MACHINE_HAS_DIAG44) {
26 diag_stat_inc(DIAG_STAT_X044);
27 asm volatile("diag 0,0,0x44");
31 EXPORT_SYMBOL(cpu_relax);
34 * cpu_init - initializes state that is per-CPU.
38 struct cpuid *id = this_cpu_ptr(&cpu_id);
41 atomic_inc(&init_mm.mm_count);
42 current->active_mm = &init_mm;
44 enter_lazy_tlb(&init_mm, current);
48 * cpu_have_feature - Test CPU features on module initialization
50 int cpu_have_feature(unsigned int num)
52 return elf_hwcap & (1UL << num);
54 EXPORT_SYMBOL(cpu_have_feature);
57 * show_cpuinfo - Get information on one CPU for use by procfs.
59 static int show_cpuinfo(struct seq_file *m, void *v)
61 static const char *hwcap_str[] = {
62 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
63 "edat", "etf3eh", "highgprs", "te", "vx"
65 static const char * const int_hwcap_str[] = {
68 unsigned long n = (unsigned long) v - 1;
72 s390_adjust_jiffies();
73 seq_printf(m, "vendor_id : IBM/S390\n"
75 "bogomips per cpu: %lu.%02lu\n",
76 num_online_cpus(), loops_per_jiffy/(500000/HZ),
77 (loops_per_jiffy/(5000/HZ))%100);
78 seq_puts(m, "features\t: ");
79 for (i = 0; i < ARRAY_SIZE(hwcap_str); i++)
80 if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
81 seq_printf(m, "%s ", hwcap_str[i]);
82 for (i = 0; i < ARRAY_SIZE(int_hwcap_str); i++)
83 if (int_hwcap_str[i] && (int_hwcap & (1UL << i)))
84 seq_printf(m, "%s ", int_hwcap_str[i]);
89 struct cpuid *id = &per_cpu(cpu_id, n);
90 seq_printf(m, "processor %li: "
92 "identification = %06X, "
94 n, id->version, id->ident, id->machine);
99 static inline void *c_update(loff_t *pos)
102 *pos = cpumask_next(*pos - 1, cpu_online_mask);
103 return *pos < nr_cpu_ids ? (void *)*pos + 1 : NULL;
106 static void *c_start(struct seq_file *m, loff_t *pos)
109 return c_update(pos);
112 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
115 return c_update(pos);
118 static void c_stop(struct seq_file *m, void *v)
123 const struct seq_operations cpuinfo_op = {
127 .show = show_cpuinfo,