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/cpufeature.h> 10 #include <linux/kernel.h> 11 #include <linux/init.h> 12 #include <linux/seq_file.h> 13 #include <linux/delay.h> 14 #include <linux/cpu.h> 15 #include <asm/diag.h> 16 #include <asm/elf.h> 17 #include <asm/lowcore.h> 18 #include <asm/param.h> 19 #include <asm/smp.h> 20 21 static DEFINE_PER_CPU(struct cpuid, cpu_id); 22 23 void notrace cpu_relax(void) 24 { 25 if (!smp_cpu_mtid && MACHINE_HAS_DIAG44) { 26 diag_stat_inc(DIAG_STAT_X044); 27 asm volatile("diag 0,0,0x44"); 28 } 29 barrier(); 30 } 31 EXPORT_SYMBOL(cpu_relax); 32 33 /* 34 * cpu_init - initializes state that is per-CPU. 35 */ 36 void cpu_init(void) 37 { 38 struct cpuid *id = this_cpu_ptr(&cpu_id); 39 40 get_cpu_id(id); 41 atomic_inc(&init_mm.mm_count); 42 current->active_mm = &init_mm; 43 BUG_ON(current->mm); 44 enter_lazy_tlb(&init_mm, current); 45 } 46 47 /* 48 * cpu_have_feature - Test CPU features on module initialization 49 */ 50 int cpu_have_feature(unsigned int num) 51 { 52 return elf_hwcap & (1UL << num); 53 } 54 EXPORT_SYMBOL(cpu_have_feature); 55 56 /* 57 * show_cpuinfo - Get information on one CPU for use by procfs. 58 */ 59 static int show_cpuinfo(struct seq_file *m, void *v) 60 { 61 static const char *hwcap_str[] = { 62 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp", 63 "edat", "etf3eh", "highgprs", "te", "vx" 64 }; 65 static const char * const int_hwcap_str[] = { 66 "sie" 67 }; 68 unsigned long n = (unsigned long) v - 1; 69 int i; 70 71 if (!n) { 72 s390_adjust_jiffies(); 73 seq_printf(m, "vendor_id : IBM/S390\n" 74 "# processors : %i\n" 75 "bogomips per cpu: %lu.%02lu\n", 76 num_online_cpus(), loops_per_jiffy/(500000/HZ), 77 (loops_per_jiffy/(5000/HZ))%100); 78 seq_puts(m, "features\t: "); 79 for (i = 0; i < ARRAY_SIZE(hwcap_str); i++) 80 if (hwcap_str[i] && (elf_hwcap & (1UL << i))) 81 seq_printf(m, "%s ", hwcap_str[i]); 82 for (i = 0; i < ARRAY_SIZE(int_hwcap_str); i++) 83 if (int_hwcap_str[i] && (int_hwcap & (1UL << i))) 84 seq_printf(m, "%s ", int_hwcap_str[i]); 85 seq_puts(m, "\n"); 86 show_cacheinfo(m); 87 } 88 if (cpu_online(n)) { 89 struct cpuid *id = &per_cpu(cpu_id, n); 90 seq_printf(m, "processor %li: " 91 "version = %02X, " 92 "identification = %06X, " 93 "machine = %04X\n", 94 n, id->version, id->ident, id->machine); 95 } 96 return 0; 97 } 98 99 static inline void *c_update(loff_t *pos) 100 { 101 if (*pos) 102 *pos = cpumask_next(*pos - 1, cpu_online_mask); 103 return *pos < nr_cpu_ids ? (void *)*pos + 1 : NULL; 104 } 105 106 static void *c_start(struct seq_file *m, loff_t *pos) 107 { 108 get_online_cpus(); 109 return c_update(pos); 110 } 111 112 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 113 { 114 ++*pos; 115 return c_update(pos); 116 } 117 118 static void c_stop(struct seq_file *m, void *v) 119 { 120 put_online_cpus(); 121 } 122 123 const struct seq_operations cpuinfo_op = { 124 .start = c_start, 125 .next = c_next, 126 .stop = c_stop, 127 .show = show_cpuinfo, 128 }; 129 130