1 /*
2 * arch/s390/kernel/processor.c
3 *
4 * Copyright IBM Corp. 2008
5 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
6 */
7
8 #define KMSG_COMPONENT "cpu"
9 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
10
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/smp.h>
14 #include <linux/seq_file.h>
15 #include <linux/delay.h>
16
17 #include <asm/elf.h>
18 #include <asm/lowcore.h>
19 #include <asm/param.h>
20
print_cpu_info(struct cpuinfo_S390 * cpuinfo)21 void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo)
22 {
23 pr_info("Processor %d started, address %d, identification %06X\n",
24 cpuinfo->cpu_nr, cpuinfo->cpu_addr, cpuinfo->cpu_id.ident);
25 }
26
27 /*
28 * show_cpuinfo - Get information on one CPU for use by procfs.
29 */
30
show_cpuinfo(struct seq_file * m,void * v)31 static int show_cpuinfo(struct seq_file *m, void *v)
32 {
33 static const char *hwcap_str[8] = {
34 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
35 "edat"
36 };
37 struct cpuinfo_S390 *cpuinfo;
38 unsigned long n = (unsigned long) v - 1;
39 int i;
40
41 s390_adjust_jiffies();
42 preempt_disable();
43 if (!n) {
44 seq_printf(m, "vendor_id : IBM/S390\n"
45 "# processors : %i\n"
46 "bogomips per cpu: %lu.%02lu\n",
47 num_online_cpus(), loops_per_jiffy/(500000/HZ),
48 (loops_per_jiffy/(5000/HZ))%100);
49 seq_puts(m, "features\t: ");
50 for (i = 0; i < 8; i++)
51 if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
52 seq_printf(m, "%s ", hwcap_str[i]);
53 seq_puts(m, "\n");
54 }
55
56 if (cpu_online(n)) {
57 #ifdef CONFIG_SMP
58 if (smp_processor_id() == n)
59 cpuinfo = &S390_lowcore.cpu_data;
60 else
61 cpuinfo = &lowcore_ptr[n]->cpu_data;
62 #else
63 cpuinfo = &S390_lowcore.cpu_data;
64 #endif
65 seq_printf(m, "processor %li: "
66 "version = %02X, "
67 "identification = %06X, "
68 "machine = %04X\n",
69 n, cpuinfo->cpu_id.version,
70 cpuinfo->cpu_id.ident,
71 cpuinfo->cpu_id.machine);
72 }
73 preempt_enable();
74 return 0;
75 }
76
c_start(struct seq_file * m,loff_t * pos)77 static void *c_start(struct seq_file *m, loff_t *pos)
78 {
79 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
80 }
81
c_next(struct seq_file * m,void * v,loff_t * pos)82 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
83 {
84 ++*pos;
85 return c_start(m, pos);
86 }
87
c_stop(struct seq_file * m,void * v)88 static void c_stop(struct seq_file *m, void *v)
89 {
90 }
91
92 const struct seq_operations cpuinfo_op = {
93 .start = c_start,
94 .next = c_next,
95 .stop = c_stop,
96 .show = show_cpuinfo,
97 };
98
99