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Commit | Line | Data |
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395d31d4 | 1 | /* |
395d31d4 MS |
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> | |
395d31d4 MS |
11 | #include <linux/seq_file.h> |
12 | #include <linux/delay.h> | |
19726cec | 13 | #include <linux/cpu.h> |
395d31d4 MS |
14 | #include <asm/elf.h> |
15 | #include <asm/lowcore.h> | |
16 | #include <asm/param.h> | |
4d92f502 | 17 | #include <asm/smp.h> |
395d31d4 | 18 | |
94038a99 MS |
19 | static DEFINE_PER_CPU(struct cpuid, cpu_id); |
20 | ||
a9ca8eb7 | 21 | void notrace cpu_relax(void) |
4d92f502 HC |
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 | ||
94038a99 MS |
29 | /* |
30 | * cpu_init - initializes state that is per-CPU. | |
31 | */ | |
e2741f17 | 32 | void cpu_init(void) |
94038a99 | 33 | { |
eb7e7d76 | 34 | struct cpuid *id = this_cpu_ptr(&cpu_id); |
94038a99 MS |
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 | ||
8f00b3e2 HB |
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 | ||
395d31d4 MS |
52 | /* |
53 | * show_cpuinfo - Get information on one CPU for use by procfs. | |
54 | */ | |
395d31d4 MS |
55 | static int show_cpuinfo(struct seq_file *m, void *v) |
56 | { | |
fbf3c542 | 57 | static const char *hwcap_str[] = { |
395d31d4 | 58 | "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp", |
80703617 | 59 | "edat", "etf3eh", "highgprs", "te", "vx" |
395d31d4 | 60 | }; |
7b468488 MS |
61 | unsigned long n = (unsigned long) v - 1; |
62 | int i; | |
395d31d4 | 63 | |
7b468488 | 64 | if (!n) { |
8e102301 | 65 | s390_adjust_jiffies(); |
7b468488 MS |
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: "); | |
fbf3c542 | 72 | for (i = 0; i < ARRAY_SIZE(hwcap_str); i++) |
7b468488 MS |
73 | if (hwcap_str[i] && (elf_hwcap & (1UL << i))) |
74 | seq_printf(m, "%s ", hwcap_str[i]); | |
75 | seq_puts(m, "\n"); | |
6668022c | 76 | show_cacheinfo(m); |
7b468488 | 77 | } |
19726cec | 78 | get_online_cpus(); |
7b468488 | 79 | if (cpu_online(n)) { |
94038a99 | 80 | struct cpuid *id = &per_cpu(cpu_id, n); |
7b468488 MS |
81 | seq_printf(m, "processor %li: " |
82 | "version = %02X, " | |
83 | "identification = %06X, " | |
84 | "machine = %04X\n", | |
94038a99 | 85 | n, id->version, id->ident, id->machine); |
7b468488 | 86 | } |
19726cec | 87 | put_online_cpus(); |
7b468488 | 88 | return 0; |
395d31d4 MS |
89 | } |
90 | ||
91 | static void *c_start(struct seq_file *m, loff_t *pos) | |
92 | { | |
dd4a5a31 | 93 | return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL; |
395d31d4 MS |
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 |