Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 1 | /* |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 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 | |
Heiko Carstens | ca21872 | 2016-05-07 12:15:34 +0200 | [diff] [blame] | 9 | #include <linux/cpufeature.h> |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 10 | #include <linux/kernel.h> |
| 11 | #include <linux/init.h> |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 12 | #include <linux/seq_file.h> |
| 13 | #include <linux/delay.h> |
Heiko Carstens | 19726ce | 2011-01-05 12:48:17 +0100 | [diff] [blame] | 14 | #include <linux/cpu.h> |
Martin Schwidefsky | 1ec2772 | 2015-08-20 17:28:44 +0200 | [diff] [blame] | 15 | #include <asm/diag.h> |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 16 | #include <asm/elf.h> |
| 17 | #include <asm/lowcore.h> |
| 18 | #include <asm/param.h> |
Heiko Carstens | 4d92f50 | 2015-01-28 07:43:56 +0100 | [diff] [blame] | 19 | #include <asm/smp.h> |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 20 | |
Martin Schwidefsky | 94038a9 | 2010-05-17 10:00:00 +0200 | [diff] [blame] | 21 | static DEFINE_PER_CPU(struct cpuid, cpu_id); |
| 22 | |
Heiko Carstens | a9ca8eb | 2015-02-28 11:35:26 +0100 | [diff] [blame] | 23 | void notrace cpu_relax(void) |
Heiko Carstens | 4d92f50 | 2015-01-28 07:43:56 +0100 | [diff] [blame] | 24 | { |
Martin Schwidefsky | 1ec2772 | 2015-08-20 17:28:44 +0200 | [diff] [blame] | 25 | if (!smp_cpu_mtid && MACHINE_HAS_DIAG44) { |
| 26 | diag_stat_inc(DIAG_STAT_X044); |
Heiko Carstens | 4d92f50 | 2015-01-28 07:43:56 +0100 | [diff] [blame] | 27 | asm volatile("diag 0,0,0x44"); |
Martin Schwidefsky | 1ec2772 | 2015-08-20 17:28:44 +0200 | [diff] [blame] | 28 | } |
Heiko Carstens | 4d92f50 | 2015-01-28 07:43:56 +0100 | [diff] [blame] | 29 | barrier(); |
| 30 | } |
| 31 | EXPORT_SYMBOL(cpu_relax); |
| 32 | |
Martin Schwidefsky | 94038a9 | 2010-05-17 10:00:00 +0200 | [diff] [blame] | 33 | /* |
| 34 | * cpu_init - initializes state that is per-CPU. |
| 35 | */ |
Paul Gortmaker | e2741f1 | 2013-06-18 17:04:52 -0400 | [diff] [blame] | 36 | void cpu_init(void) |
Martin Schwidefsky | 94038a9 | 2010-05-17 10:00:00 +0200 | [diff] [blame] | 37 | { |
Christoph Lameter | eb7e7d7 | 2014-08-17 12:30:45 -0500 | [diff] [blame] | 38 | struct cpuid *id = this_cpu_ptr(&cpu_id); |
Martin Schwidefsky | 94038a9 | 2010-05-17 10:00:00 +0200 | [diff] [blame] | 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 | /* |
Hendrik Brueckner | 8f00b3e | 2015-02-19 12:22:02 +0100 | [diff] [blame] | 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 | /* |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 57 | * show_cpuinfo - Get information on one CPU for use by procfs. |
| 58 | */ |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 59 | static int show_cpuinfo(struct seq_file *m, void *v) |
| 60 | { |
Heiko Carstens | fbf3c54 | 2012-08-29 14:54:38 +0200 | [diff] [blame] | 61 | static const char *hwcap_str[] = { |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 62 | "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp", |
Martin Schwidefsky | 8070361 | 2014-10-06 17:53:53 +0200 | [diff] [blame] | 63 | "edat", "etf3eh", "highgprs", "te", "vx" |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 64 | }; |
David Hildenbrand | 7f16d7e | 2015-02-24 15:54:47 +0100 | [diff] [blame] | 65 | static const char * const int_hwcap_str[] = { |
| 66 | "sie" |
| 67 | }; |
Martin Schwidefsky | 7b46848 | 2009-03-26 15:24:42 +0100 | [diff] [blame] | 68 | unsigned long n = (unsigned long) v - 1; |
| 69 | int i; |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 70 | |
Martin Schwidefsky | 7b46848 | 2009-03-26 15:24:42 +0100 | [diff] [blame] | 71 | if (!n) { |
Heiko Carstens | 8e10230 | 2011-01-05 12:48:18 +0100 | [diff] [blame] | 72 | s390_adjust_jiffies(); |
Martin Schwidefsky | 7b46848 | 2009-03-26 15:24:42 +0100 | [diff] [blame] | 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: "); |
Heiko Carstens | fbf3c54 | 2012-08-29 14:54:38 +0200 | [diff] [blame] | 79 | for (i = 0; i < ARRAY_SIZE(hwcap_str); i++) |
Martin Schwidefsky | 7b46848 | 2009-03-26 15:24:42 +0100 | [diff] [blame] | 80 | if (hwcap_str[i] && (elf_hwcap & (1UL << i))) |
| 81 | seq_printf(m, "%s ", hwcap_str[i]); |
David Hildenbrand | 7f16d7e | 2015-02-24 15:54:47 +0100 | [diff] [blame] | 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]); |
Martin Schwidefsky | 7b46848 | 2009-03-26 15:24:42 +0100 | [diff] [blame] | 85 | seq_puts(m, "\n"); |
Heiko Carstens | 6668022 | 2012-08-29 14:12:20 +0200 | [diff] [blame] | 86 | show_cacheinfo(m); |
Martin Schwidefsky | 7b46848 | 2009-03-26 15:24:42 +0100 | [diff] [blame] | 87 | } |
Martin Schwidefsky | 7b46848 | 2009-03-26 15:24:42 +0100 | [diff] [blame] | 88 | if (cpu_online(n)) { |
Martin Schwidefsky | 94038a9 | 2010-05-17 10:00:00 +0200 | [diff] [blame] | 89 | struct cpuid *id = &per_cpu(cpu_id, n); |
Martin Schwidefsky | 7b46848 | 2009-03-26 15:24:42 +0100 | [diff] [blame] | 90 | seq_printf(m, "processor %li: " |
| 91 | "version = %02X, " |
| 92 | "identification = %06X, " |
| 93 | "machine = %04X\n", |
Martin Schwidefsky | 94038a9 | 2010-05-17 10:00:00 +0200 | [diff] [blame] | 94 | n, id->version, id->ident, id->machine); |
Martin Schwidefsky | 7b46848 | 2009-03-26 15:24:42 +0100 | [diff] [blame] | 95 | } |
Martin Schwidefsky | 7b46848 | 2009-03-26 15:24:42 +0100 | [diff] [blame] | 96 | return 0; |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 97 | } |
| 98 | |
Heiko Carstens | 281eaa8 | 2016-04-13 14:49:12 +0200 | [diff] [blame] | 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 | |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 106 | static void *c_start(struct seq_file *m, loff_t *pos) |
| 107 | { |
Heiko Carstens | 281eaa8 | 2016-04-13 14:49:12 +0200 | [diff] [blame] | 108 | get_online_cpus(); |
| 109 | return c_update(pos); |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 110 | } |
| 111 | |
| 112 | static void *c_next(struct seq_file *m, void *v, loff_t *pos) |
| 113 | { |
| 114 | ++*pos; |
Heiko Carstens | 281eaa8 | 2016-04-13 14:49:12 +0200 | [diff] [blame] | 115 | return c_update(pos); |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 116 | } |
| 117 | |
| 118 | static void c_stop(struct seq_file *m, void *v) |
| 119 | { |
Heiko Carstens | 281eaa8 | 2016-04-13 14:49:12 +0200 | [diff] [blame] | 120 | put_online_cpus(); |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 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 | |