1395d31d4SMartin Schwidefsky /* 2395d31d4SMartin Schwidefsky * arch/s390/kernel/processor.c 3395d31d4SMartin Schwidefsky * 4395d31d4SMartin Schwidefsky * Copyright IBM Corp. 2008 5395d31d4SMartin Schwidefsky * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) 6395d31d4SMartin Schwidefsky */ 7395d31d4SMartin Schwidefsky 8395d31d4SMartin Schwidefsky #define KMSG_COMPONENT "cpu" 9395d31d4SMartin Schwidefsky #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 10395d31d4SMartin Schwidefsky 11395d31d4SMartin Schwidefsky #include <linux/kernel.h> 12395d31d4SMartin Schwidefsky #include <linux/init.h> 13395d31d4SMartin Schwidefsky #include <linux/smp.h> 14395d31d4SMartin Schwidefsky #include <linux/seq_file.h> 15395d31d4SMartin Schwidefsky #include <linux/delay.h> 1619726cecSHeiko Carstens #include <linux/cpu.h> 17395d31d4SMartin Schwidefsky #include <asm/elf.h> 18395d31d4SMartin Schwidefsky #include <asm/lowcore.h> 19395d31d4SMartin Schwidefsky #include <asm/param.h> 20395d31d4SMartin Schwidefsky 2194038a99SMartin Schwidefsky static DEFINE_PER_CPU(struct cpuid, cpu_id); 2294038a99SMartin Schwidefsky 2394038a99SMartin Schwidefsky /* 2494038a99SMartin Schwidefsky * cpu_init - initializes state that is per-CPU. 2594038a99SMartin Schwidefsky */ 2694038a99SMartin Schwidefsky void __cpuinit cpu_init(void) 2794038a99SMartin Schwidefsky { 2894038a99SMartin Schwidefsky struct cpuid *id = &per_cpu(cpu_id, smp_processor_id()); 2994038a99SMartin Schwidefsky 3094038a99SMartin Schwidefsky get_cpu_id(id); 3194038a99SMartin Schwidefsky atomic_inc(&init_mm.mm_count); 3294038a99SMartin Schwidefsky current->active_mm = &init_mm; 3394038a99SMartin Schwidefsky BUG_ON(current->mm); 3494038a99SMartin Schwidefsky enter_lazy_tlb(&init_mm, current); 3594038a99SMartin Schwidefsky } 3694038a99SMartin Schwidefsky 3794038a99SMartin Schwidefsky /* 38395d31d4SMartin Schwidefsky * show_cpuinfo - Get information on one CPU for use by procfs. 39395d31d4SMartin Schwidefsky */ 40395d31d4SMartin Schwidefsky static int show_cpuinfo(struct seq_file *m, void *v) 41395d31d4SMartin Schwidefsky { 42be6e3f9cSAndreas Krebbel static const char *hwcap_str[10] = { 43395d31d4SMartin Schwidefsky "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp", 44be6e3f9cSAndreas Krebbel "edat", "etf3eh", "highgprs" 45395d31d4SMartin Schwidefsky }; 46395d31d4SMartin Schwidefsky unsigned long n = (unsigned long) v - 1; 47395d31d4SMartin Schwidefsky int i; 48395d31d4SMartin Schwidefsky 49395d31d4SMartin Schwidefsky if (!n) { 508e102301SHeiko Carstens s390_adjust_jiffies(); 51395d31d4SMartin Schwidefsky seq_printf(m, "vendor_id : IBM/S390\n" 52395d31d4SMartin Schwidefsky "# processors : %i\n" 53395d31d4SMartin Schwidefsky "bogomips per cpu: %lu.%02lu\n", 54395d31d4SMartin Schwidefsky num_online_cpus(), loops_per_jiffy/(500000/HZ), 55395d31d4SMartin Schwidefsky (loops_per_jiffy/(5000/HZ))%100); 56395d31d4SMartin Schwidefsky seq_puts(m, "features\t: "); 57be6e3f9cSAndreas Krebbel for (i = 0; i < 10; i++) 58395d31d4SMartin Schwidefsky if (hwcap_str[i] && (elf_hwcap & (1UL << i))) 59395d31d4SMartin Schwidefsky seq_printf(m, "%s ", hwcap_str[i]); 60395d31d4SMartin Schwidefsky seq_puts(m, "\n"); 61395d31d4SMartin Schwidefsky } 6219726cecSHeiko Carstens get_online_cpus(); 63395d31d4SMartin Schwidefsky if (cpu_online(n)) { 6494038a99SMartin Schwidefsky struct cpuid *id = &per_cpu(cpu_id, n); 65395d31d4SMartin Schwidefsky seq_printf(m, "processor %li: " 66395d31d4SMartin Schwidefsky "version = %02X, " 67395d31d4SMartin Schwidefsky "identification = %06X, " 68395d31d4SMartin Schwidefsky "machine = %04X\n", 6994038a99SMartin Schwidefsky n, id->version, id->ident, id->machine); 70395d31d4SMartin Schwidefsky } 7119726cecSHeiko Carstens put_online_cpus(); 72395d31d4SMartin Schwidefsky return 0; 73395d31d4SMartin Schwidefsky } 74395d31d4SMartin Schwidefsky 75395d31d4SMartin Schwidefsky static void *c_start(struct seq_file *m, loff_t *pos) 76395d31d4SMartin Schwidefsky { 77395d31d4SMartin Schwidefsky return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL; 78395d31d4SMartin Schwidefsky } 79395d31d4SMartin Schwidefsky 80395d31d4SMartin Schwidefsky static void *c_next(struct seq_file *m, void *v, loff_t *pos) 81395d31d4SMartin Schwidefsky { 82395d31d4SMartin Schwidefsky ++*pos; 83395d31d4SMartin Schwidefsky return c_start(m, pos); 84395d31d4SMartin Schwidefsky } 85395d31d4SMartin Schwidefsky 86395d31d4SMartin Schwidefsky static void c_stop(struct seq_file *m, void *v) 87395d31d4SMartin Schwidefsky { 88395d31d4SMartin Schwidefsky } 89395d31d4SMartin Schwidefsky 90395d31d4SMartin Schwidefsky const struct seq_operations cpuinfo_op = { 91395d31d4SMartin Schwidefsky .start = c_start, 92395d31d4SMartin Schwidefsky .next = c_next, 93395d31d4SMartin Schwidefsky .stop = c_stop, 94395d31d4SMartin Schwidefsky .show = show_cpuinfo, 95395d31d4SMartin Schwidefsky }; 96395d31d4SMartin Schwidefsky 97