arch/s390/kernel/diag.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Implementation of s390 diagnose codes
   4  *
   5  * Copyright IBM Corp. 2007
   6  * Author(s): Michael Holzheu <holzheu@de.ibm.com>
   7  */
   8
   9 #include <linux/export.h>
  10 #include <linux/init.h>
  11 #include <linux/cpu.h>
  12 #include <linux/seq_file.h>
  13 #include <linux/debugfs.h>
  14 #include <asm/diag.h>
  15 #include <asm/trace/diag.h>
  16 #include <asm/sections.h>
  17 #include "entry.h"
  18
  19 struct diag_stat {
  20         unsigned int counter[NR_DIAG_STAT];
  21 };
  22
  23 static DEFINE_PER_CPU(struct diag_stat, diag_stat);
  24
  25 struct diag_desc {
  26         int code;
  27         char *name;
  28 };
  29
  30 static const struct diag_desc diag_map[NR_DIAG_STAT] = {
  31         [DIAG_STAT_X008] = { .code = 0x008, .name = "Console Function" },
  32         [DIAG_STAT_X00C] = { .code = 0x00c, .name = "Pseudo Timer" },
  33         [DIAG_STAT_X010] = { .code = 0x010, .name = "Release Pages" },
  34         [DIAG_STAT_X014] = { .code = 0x014, .name = "Spool File Services" },
  35         [DIAG_STAT_X044] = { .code = 0x044, .name = "Voluntary Timeslice End" },
  36         [DIAG_STAT_X064] = { .code = 0x064, .name = "NSS Manipulation" },
  37         [DIAG_STAT_X09C] = { .code = 0x09c, .name = "Relinquish Timeslice" },
  38         [DIAG_STAT_X0DC] = { .code = 0x0dc, .name = "Appldata Control" },
  39         [DIAG_STAT_X204] = { .code = 0x204, .name = "Logical-CPU Utilization" },
  40         [DIAG_STAT_X210] = { .code = 0x210, .name = "Device Information" },
  41         [DIAG_STAT_X224] = { .code = 0x224, .name = "EBCDIC-Name Table" },
  42         [DIAG_STAT_X250] = { .code = 0x250, .name = "Block I/O" },
  43         [DIAG_STAT_X258] = { .code = 0x258, .name = "Page-Reference Services" },
  44         [DIAG_STAT_X26C] = { .code = 0x26c, .name = "Certain System Information" },
  45         [DIAG_STAT_X288] = { .code = 0x288, .name = "Time Bomb" },
  46         [DIAG_STAT_X2C4] = { .code = 0x2c4, .name = "FTP Services" },
  47         [DIAG_STAT_X2FC] = { .code = 0x2fc, .name = "Guest Performance Data" },
  48         [DIAG_STAT_X304] = { .code = 0x304, .name = "Partition-Resource Service" },
  49         [DIAG_STAT_X308] = { .code = 0x308, .name = "List-Directed IPL" },
  50         [DIAG_STAT_X318] = { .code = 0x318, .name = "CP Name and Version Codes" },
  51         [DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" },
  52 };
  53
  54 struct diag_ops __amode31_ref diag_amode31_ops = {
  55         .diag210 = _diag210_amode31,
  56         .diag26c = _diag26c_amode31,
  57         .diag14 = _diag14_amode31,
  58         .diag0c = _diag0c_amode31,
  59         .diag308_reset = _diag308_reset_amode31
  60 };
  61
  62 static struct diag210 _diag210_tmp_amode31 __section(".amode31.data");
  63 struct diag210 __amode31_ref *__diag210_tmp_amode31 = &_diag210_tmp_amode31;
  64
  65 static int show_diag_stat(struct seq_file *m, void *v)
  66 {
  67         struct diag_stat *stat;
  68         unsigned long n = (unsigned long) v - 1;
  69         int cpu, prec, tmp;
  70
  71         cpus_read_lock();
  72         if (n == 0) {
  73                 seq_puts(m, "         ");
  74
  75                 for_each_online_cpu(cpu) {
  76                         prec = 10;
  77                         for (tmp = 10; cpu >= tmp; tmp *= 10)
  78                                 prec--;
  79                         seq_printf(m, "%*s%d", prec, "CPU", cpu);
  80                 }
  81                 seq_putc(m, '\n');
  82         } else if (n <= NR_DIAG_STAT) {
  83                 seq_printf(m, "diag %03x:", diag_map[n-1].code);
  84                 for_each_online_cpu(cpu) {
  85                         stat = &per_cpu(diag_stat, cpu);
  86                         seq_printf(m, " %10u", stat->counter[n-1]);
  87                 }
  88                 seq_printf(m, "    %s\n", diag_map[n-1].name);
  89         }
  90         cpus_read_unlock();
  91         return 0;
  92 }
  93
  94 static void *show_diag_stat_start(struct seq_file *m, loff_t *pos)
  95 {
  96         return *pos <= NR_DIAG_STAT ? (void *)((unsigned long) *pos + 1) : NULL;
  97 }
  98
  99 static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos)
 100 {
 101         ++*pos;
 102         return show_diag_stat_start(m, pos);
 103 }
 104
 105 static void show_diag_stat_stop(struct seq_file *m, void *v)
 106 {
 107 }
 108
 109 static const struct seq_operations show_diag_stat_sops = {
 110         .start  = show_diag_stat_start,
 111         .next   = show_diag_stat_next,
 112         .stop   = show_diag_stat_stop,
 113         .show   = show_diag_stat,
 114 };
 115
 116 DEFINE_SEQ_ATTRIBUTE(show_diag_stat);
 117
 118 static int __init show_diag_stat_init(void)
 119 {
 120         debugfs_create_file("diag_stat", 0400, NULL, NULL,
 121                             &show_diag_stat_fops);
 122         return 0;
 123 }
 124
 125 device_initcall(show_diag_stat_init);
 126
 127 void diag_stat_inc(enum diag_stat_enum nr)
 128 {
 129         this_cpu_inc(diag_stat.counter[nr]);
 130         trace_s390_diagnose(diag_map[nr].code);
 131 }
 132 EXPORT_SYMBOL(diag_stat_inc);
 133
 134 void notrace diag_stat_inc_norecursion(enum diag_stat_enum nr)
 135 {
 136         this_cpu_inc(diag_stat.counter[nr]);
 137         trace_s390_diagnose_norecursion(diag_map[nr].code);
 138 }
 139 EXPORT_SYMBOL(diag_stat_inc_norecursion);
 140
 141 /*
 142  * Diagnose 14: Input spool file manipulation
 143  */
 144 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
 145 {
 146         diag_stat_inc(DIAG_STAT_X014);
 147         return diag_amode31_ops.diag14(rx, ry1, subcode);
 148 }
 149 EXPORT_SYMBOL(diag14);
 150
 151 static inline int __diag204(unsigned long *subcode, unsigned long size, void *addr)
 152 {
 153         union register_pair rp = { .even = *subcode, .odd = size };
 154
 155         asm volatile(
 156                 "       diag    %[addr],%[rp],0x204\n"
 157                 "0:     nopr    %%r7\n"
 158                 EX_TABLE(0b,0b)
 159                 : [rp] "+&d" (rp.pair) : [addr] "d" (addr) : "memory");
 160         *subcode = rp.even;
 161         return rp.odd;
 162 }
 163
 164 int diag204(unsigned long subcode, unsigned long size, void *addr)
 165 {
 166         diag_stat_inc(DIAG_STAT_X204);
 167         size = __diag204(&subcode, size, addr);
 168         if (subcode)
 169                 return -1;
 170         return size;
 171 }
 172 EXPORT_SYMBOL(diag204);
 173
 174 /*
 175  * Diagnose 210: Get information about a virtual device
 176  */
 177 int diag210(struct diag210 *addr)
 178 {
 179         static DEFINE_SPINLOCK(diag210_lock);
 180         unsigned long flags;
 181         int ccode;
 182
 183         spin_lock_irqsave(&diag210_lock, flags);
 184         *__diag210_tmp_amode31 = *addr;
 185
 186         diag_stat_inc(DIAG_STAT_X210);
 187         ccode = diag_amode31_ops.diag210(__diag210_tmp_amode31);
 188
 189         *addr = *__diag210_tmp_amode31;
 190         spin_unlock_irqrestore(&diag210_lock, flags);
 191
 192         return ccode;
 193 }
 194 EXPORT_SYMBOL(diag210);
 195
 196 int diag224(void *ptr)
 197 {
 198         int rc = -EOPNOTSUPP;
 199
 200         diag_stat_inc(DIAG_STAT_X224);
 201         asm volatile(
 202                 "       diag    %1,%2,0x224\n"
 203                 "0:     lhi     %0,0x0\n"
 204                 "1:\n"
 205                 EX_TABLE(0b,1b)
 206                 : "+d" (rc) :"d" (0), "d" (ptr) : "memory");
 207         return rc;
 208 }
 209 EXPORT_SYMBOL(diag224);
 210
 211 /*
 212  * Diagnose 26C: Access Certain System Information
 213  */
 214 int diag26c(void *req, void *resp, enum diag26c_sc subcode)
 215 {
 216         diag_stat_inc(DIAG_STAT_X26C);
 217         return diag_amode31_ops.diag26c(req, resp, subcode);
 218 }
 219 EXPORT_SYMBOL(diag26c);