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/bitops.h>
11 #include <linux/kernel.h>
12 #include <linux/sched/mm.h>
13 #include <linux/init.h>
14 #include <linux/seq_file.h>
15 #include <linux/mm_types.h>
16 #include <linux/delay.h>
17 #include <linux/cpu.h>
20 #include <asm/facility.h>
22 #include <asm/lowcore.h>
23 #include <asm/param.h>
27 unsigned int cpu_mhz_dynamic;
28 unsigned int cpu_mhz_static;
32 static DEFINE_PER_CPU(struct cpu_info, cpu_info);
34 static bool machine_has_cpu_mhz;
36 void __init cpu_detect_mhz_feature(void)
38 if (test_facility(34) && __ecag(ECAG_CPU_ATTRIBUTE, 0) != -1UL)
39 machine_has_cpu_mhz = true;
42 static void update_cpu_mhz(void *arg)
47 mhz = __ecag(ECAG_CPU_ATTRIBUTE, 0);
48 c = this_cpu_ptr(&cpu_info);
49 c->cpu_mhz_dynamic = mhz >> 32;
50 c->cpu_mhz_static = mhz & 0xffffffff;
53 void s390_update_cpu_mhz(void)
55 s390_adjust_jiffies();
56 if (machine_has_cpu_mhz)
57 on_each_cpu(update_cpu_mhz, NULL, 0);
60 void notrace cpu_relax_yield(void)
62 if (!smp_cpu_mtid && MACHINE_HAS_DIAG44) {
63 diag_stat_inc(DIAG_STAT_X044);
64 asm volatile("diag 0,0,0x44");
68 EXPORT_SYMBOL(cpu_relax_yield);
71 * cpu_init - initializes state that is per-CPU.
75 struct cpuid *id = this_cpu_ptr(&cpu_info.cpu_id);
78 if (machine_has_cpu_mhz)
81 current->active_mm = &init_mm;
83 enter_lazy_tlb(&init_mm, current);
87 * cpu_have_feature - Test CPU features on module initialization
89 int cpu_have_feature(unsigned int num)
91 return elf_hwcap & (1UL << num);
93 EXPORT_SYMBOL(cpu_have_feature);
95 static void show_facilities(struct seq_file *m)
100 facilities = (long *)&S390_lowcore.stfle_fac_list;
101 seq_puts(m, "facilities :");
102 for_each_set_bit_inv(bit, facilities, MAX_FACILITY_BIT)
103 seq_printf(m, " %d", bit);
107 static void show_cpu_summary(struct seq_file *m, void *v)
109 static const char *hwcap_str[] = {
110 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
111 "edat", "etf3eh", "highgprs", "te", "vx", "vxd", "vxe", "gs"
113 static const char * const int_hwcap_str[] = {
118 seq_printf(m, "vendor_id : IBM/S390\n"
119 "# processors : %i\n"
120 "bogomips per cpu: %lu.%02lu\n",
121 num_online_cpus(), loops_per_jiffy/(500000/HZ),
122 (loops_per_jiffy/(5000/HZ))%100);
123 seq_printf(m, "max thread id : %d\n", smp_cpu_mtid);
124 seq_puts(m, "features\t: ");
125 for (i = 0; i < ARRAY_SIZE(hwcap_str); i++)
126 if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
127 seq_printf(m, "%s ", hwcap_str[i]);
128 for (i = 0; i < ARRAY_SIZE(int_hwcap_str); i++)
129 if (int_hwcap_str[i] && (int_hwcap & (1UL << i)))
130 seq_printf(m, "%s ", int_hwcap_str[i]);
134 for_each_online_cpu(cpu) {
135 struct cpuid *id = &per_cpu(cpu_info.cpu_id, cpu);
137 seq_printf(m, "processor %d: "
139 "identification = %06X, "
141 cpu, id->version, id->ident, id->machine);
145 static void show_cpu_mhz(struct seq_file *m, unsigned long n)
147 struct cpu_info *c = per_cpu_ptr(&cpu_info, n);
149 seq_printf(m, "cpu MHz dynamic : %d\n", c->cpu_mhz_dynamic);
150 seq_printf(m, "cpu MHz static : %d\n", c->cpu_mhz_static);
154 * show_cpuinfo - Get information on one CPU for use by procfs.
156 static int show_cpuinfo(struct seq_file *m, void *v)
158 unsigned long n = (unsigned long) v - 1;
161 show_cpu_summary(m, v);
162 if (!machine_has_cpu_mhz)
164 seq_printf(m, "\ncpu number : %ld\n", n);
169 static inline void *c_update(loff_t *pos)
172 *pos = cpumask_next(*pos - 1, cpu_online_mask);
173 return *pos < nr_cpu_ids ? (void *)*pos + 1 : NULL;
176 static void *c_start(struct seq_file *m, loff_t *pos)
179 return c_update(pos);
182 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
185 return c_update(pos);
188 static void c_stop(struct seq_file *m, void *v)
193 const struct seq_operations cpuinfo_op = {
197 .show = show_cpuinfo,