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/diag.h> 15 #include <asm/elf.h> 16 #include <asm/lowcore.h> 17 #include <asm/param.h> 18 #include <asm/smp.h> 19 20 static DEFINE_PER_CPU(struct cpuid, cpu_id); 21 22 void notrace cpu_relax(void) 23 { 24 if (!smp_cpu_mtid && MACHINE_HAS_DIAG44) { 25 diag_stat_inc(DIAG_STAT_X044); 26 asm volatile("diag 0,0,0x44"); 27 } 28 barrier(); 29 } 30 EXPORT_SYMBOL(cpu_relax); 31 32 /* 33 * cpu_init - initializes state that is per-CPU. 34 */ 35 void cpu_init(void) 36 { 37 struct cpuid *id = this_cpu_ptr(&cpu_id); 38 39 get_cpu_id(id); 40 atomic_inc(&init_mm.mm_count); 41 current->active_mm = &init_mm; 42 BUG_ON(current->mm); 43 enter_lazy_tlb(&init_mm, current); 44 } 45 46 /* 47 * cpu_have_feature - Test CPU features on module initialization 48 */ 49 int cpu_have_feature(unsigned int num) 50 { 51 return elf_hwcap & (1UL << num); 52 } 53 EXPORT_SYMBOL(cpu_have_feature); 54 55 /* 56 * show_cpuinfo - Get information on one CPU for use by procfs. 57 */ 58 static int show_cpuinfo(struct seq_file *m, void *v) 59 { 60 static const char *hwcap_str[] = { 61 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp", 62 "edat", "etf3eh", "highgprs", "te", "vx" 63 }; 64 unsigned long n = (unsigned long) v - 1; 65 int i; 66 67 if (!n) { 68 s390_adjust_jiffies(); 69 seq_printf(m, "vendor_id : IBM/S390\n" 70 "# processors : %i\n" 71 "bogomips per cpu: %lu.%02lu\n", 72 num_online_cpus(), loops_per_jiffy/(500000/HZ), 73 (loops_per_jiffy/(5000/HZ))%100); 74 seq_puts(m, "features\t: "); 75 for (i = 0; i < ARRAY_SIZE(hwcap_str); i++) 76 if (hwcap_str[i] && (elf_hwcap & (1UL << i))) 77 seq_printf(m, "%s ", hwcap_str[i]); 78 seq_puts(m, "\n"); 79 show_cacheinfo(m); 80 } 81 get_online_cpus(); 82 if (cpu_online(n)) { 83 struct cpuid *id = &per_cpu(cpu_id, n); 84 seq_printf(m, "processor %li: " 85 "version = %02X, " 86 "identification = %06X, " 87 "machine = %04X\n", 88 n, id->version, id->ident, id->machine); 89 } 90 put_online_cpus(); 91 return 0; 92 } 93 94 static void *c_start(struct seq_file *m, loff_t *pos) 95 { 96 return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL; 97 } 98 99 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 100 { 101 ++*pos; 102 return c_start(m, pos); 103 } 104 105 static void c_stop(struct seq_file *m, void *v) 106 { 107 } 108 109 const struct seq_operations cpuinfo_op = { 110 .start = c_start, 111 .next = c_next, 112 .stop = c_stop, 113 .show = show_cpuinfo, 114 }; 115 116