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