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 <[email protected]>
   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/asm-extable.h>
  15 #include <asm/diag.h>
  16 #include <asm/trace/diag.h>
  17 #include <asm/sections.h>
  18 #include "entry.h"
  19
  20 struct diag_stat {
  21         unsigned int counter[NR_DIAG_STAT];
  22 };
  23
  24 static DEFINE_PER_CPU(struct diag_stat, diag_stat);
  25
  26 struct diag_desc {
  27         int code;
  28         char *name;
  29 };
  30
  31 static const struct diag_desc diag_map[NR_DIAG_STAT] = {
  32         [DIAG_STAT_X008] = { .code = 0x008, .name = "Console Function" },
  33         [DIAG_STAT_X00C] = { .code = 0x00c, .name = "Pseudo Timer" },
  34         [DIAG_STAT_X010] = { .code = 0x010, .name = "Release Pages" },
  35         [DIAG_STAT_X014] = { .code = 0x014, .name = "Spool File Services" },
  36         [DIAG_STAT_X044] = { .code = 0x044, .name = "Voluntary Timeslice End" },
  37         [DIAG_STAT_X064] = { .code = 0x064, .name = "NSS Manipulation" },
  38         [DIAG_STAT_X08C] = { .code = 0x08c, .name = "Access 3270 Display Device Information" },
  39         [DIAG_STAT_X09C] = { .code = 0x09c, .name = "Relinquish Timeslice" },
  40         [DIAG_STAT_X0DC] = { .code = 0x0dc, .name = "Appldata Control" },
  41         [DIAG_STAT_X204] = { .code = 0x204, .name = "Logical-CPU Utilization" },
  42         [DIAG_STAT_X210] = { .code = 0x210, .name = "Device Information" },
  43         [DIAG_STAT_X224] = { .code = 0x224, .name = "EBCDIC-Name Table" },
  44         [DIAG_STAT_X250] = { .code = 0x250, .name = "Block I/O" },
  45         [DIAG_STAT_X258] = { .code = 0x258, .name = "Page-Reference Services" },
  46         [DIAG_STAT_X26C] = { .code = 0x26c, .name = "Certain System Information" },
  47         [DIAG_STAT_X288] = { .code = 0x288, .name = "Time Bomb" },
  48         [DIAG_STAT_X2C4] = { .code = 0x2c4, .name = "FTP Services" },
  49         [DIAG_STAT_X2FC] = { .code = 0x2fc, .name = "Guest Performance Data" },
  50         [DIAG_STAT_X304] = { .code = 0x304, .name = "Partition-Resource Service" },
  51         [DIAG_STAT_X308] = { .code = 0x308, .name = "List-Directed IPL" },
  52         [DIAG_STAT_X318] = { .code = 0x318, .name = "CP Name and Version Codes" },
  53         [DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" },
  54 };
  55
  56 struct diag_ops __amode31_ref diag_amode31_ops = {
  57         .diag210 = _diag210_amode31,
  58         .diag26c = _diag26c_amode31,
  59         .diag14 = _diag14_amode31,
  60         .diag0c = _diag0c_amode31,
  61         .diag8c = _diag8c_amode31,
  62         .diag308_reset = _diag308_reset_amode31
  63 };
  64
  65 static struct diag210 _diag210_tmp_amode31 __section(".amode31.data");
  66 struct diag210 __amode31_ref *__diag210_tmp_amode31 = &_diag210_tmp_amode31;
  67
  68 static struct diag8c _diag8c_tmp_amode31 __section(".amode31.data");
  69 static struct diag8c __amode31_ref *__diag8c_tmp_amode31 = &_diag8c_tmp_amode31;
  70
  71 static int show_diag_stat(struct seq_file *m, void *v)
  72 {
  73         struct diag_stat *stat;
  74         unsigned long n = (unsigned long) v - 1;
  75         int cpu, prec, tmp;
  76
  77         cpus_read_lock();
  78         if (n == 0) {
  79                 seq_puts(m, "         ");
  80
  81                 for_each_online_cpu(cpu) {
  82                         prec = 10;
  83                         for (tmp = 10; cpu >= tmp; tmp *= 10)
  84                                 prec--;
  85                         seq_printf(m, "%*s%d", prec, "CPU", cpu);
  86                 }
  87                 seq_putc(m, '\n');
  88         } else if (n <= NR_DIAG_STAT) {
  89                 seq_printf(m, "diag %03x:", diag_map[n-1].code);
  90                 for_each_online_cpu(cpu) {
  91                         stat = &per_cpu(diag_stat, cpu);
  92                         seq_printf(m, " %10u", stat->counter[n-1]);
  93                 }
  94                 seq_printf(m, "    %s\n", diag_map[n-1].name);
  95         }
  96         cpus_read_unlock();
  97         return 0;
  98 }
  99
 100 static void *show_diag_stat_start(struct seq_file *m, loff_t *pos)
 101 {
 102         return *pos <= NR_DIAG_STAT ? (void *)((unsigned long) *pos + 1) : NULL;
 103 }
 104
 105 static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos)
 106 {
 107         ++*pos;
 108         return show_diag_stat_start(m, pos);
 109 }
 110
 111 static void show_diag_stat_stop(struct seq_file *m, void *v)
 112 {
 113 }
 114
 115 static const struct seq_operations show_diag_stat_sops = {
 116         .start  = show_diag_stat_start,
 117         .next   = show_diag_stat_next,
 118         .stop   = show_diag_stat_stop,
 119         .show   = show_diag_stat,
 120 };
 121
 122 DEFINE_SEQ_ATTRIBUTE(show_diag_stat);
 123
 124 static int __init show_diag_stat_init(void)
 125 {
 126         debugfs_create_file("diag_stat", 0400, NULL, NULL,
 127                             &show_diag_stat_fops);
 128         return 0;
 129 }
 130
 131 device_initcall(show_diag_stat_init);
 132
 133 void diag_stat_inc(enum diag_stat_enum nr)
 134 {
 135         this_cpu_inc(diag_stat.counter[nr]);
 136         trace_s390_diagnose(diag_map[nr].code);
 137 }
 138 EXPORT_SYMBOL(diag_stat_inc);
 139
 140 void notrace diag_stat_inc_norecursion(enum diag_stat_enum nr)
 141 {
 142         this_cpu_inc(diag_stat.counter[nr]);
 143         trace_s390_diagnose_norecursion(diag_map[nr].code);
 144 }
 145 EXPORT_SYMBOL(diag_stat_inc_norecursion);
 146
 147 /*
 148  * Diagnose 14: Input spool file manipulation
 149  */
 150 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
 151 {
 152         diag_stat_inc(DIAG_STAT_X014);
 153         return diag_amode31_ops.diag14(rx, ry1, subcode);
 154 }
 155 EXPORT_SYMBOL(diag14);
 156
 157 static inline int __diag204(unsigned long *subcode, unsigned long size, void *addr)
 158 {
 159         union register_pair rp = { .even = *subcode, .odd = size };
 160
 161         asm volatile(
 162                 "       diag    %[addr],%[rp],0x204\n"
 163                 "0:     nopr    %%r7\n"
 164                 EX_TABLE(0b,0b)
 165                 : [rp] "+&d" (rp.pair) : [addr] "d" (addr) : "memory");
 166         *subcode = rp.even;
 167         return rp.odd;
 168 }
 169
 170 int diag204(unsigned long subcode, unsigned long size, void *addr)
 171 {
 172         diag_stat_inc(DIAG_STAT_X204);
 173         size = __diag204(&subcode, size, addr);
 174         if (subcode)
 175                 return -1;
 176         return size;
 177 }
 178 EXPORT_SYMBOL(diag204);
 179
 180 /*
 181  * Diagnose 210: Get information about a virtual device
 182  */
 183 int diag210(struct diag210 *addr)
 184 {
 185         static DEFINE_SPINLOCK(diag210_lock);
 186         unsigned long flags;
 187         int ccode;
 188
 189         spin_lock_irqsave(&diag210_lock, flags);
 190         *__diag210_tmp_amode31 = *addr;
 191
 192         diag_stat_inc(DIAG_STAT_X210);
 193         ccode = diag_amode31_ops.diag210(__diag210_tmp_amode31);
 194
 195         *addr = *__diag210_tmp_amode31;
 196         spin_unlock_irqrestore(&diag210_lock, flags);
 197
 198         return ccode;
 199 }
 200 EXPORT_SYMBOL(diag210);
 201
 202 /*
 203  * Diagnose 210: Get information about a virtual device
 204  */
 205 int diag8c(struct diag8c *addr, struct ccw_dev_id *devno)
 206 {
 207         static DEFINE_SPINLOCK(diag8c_lock);
 208         unsigned long flags;
 209         int ccode;
 210
 211         spin_lock_irqsave(&diag8c_lock, flags);
 212
 213         diag_stat_inc(DIAG_STAT_X08C);
 214         ccode = diag_amode31_ops.diag8c(__diag8c_tmp_amode31, devno, sizeof(*addr));
 215
 216         *addr = *__diag8c_tmp_amode31;
 217         spin_unlock_irqrestore(&diag8c_lock, flags);
 218
 219         return ccode;
 220 }
 221 EXPORT_SYMBOL(diag8c);
 222
 223 int diag224(void *ptr)
 224 {
 225         int rc = -EOPNOTSUPP;
 226
 227         diag_stat_inc(DIAG_STAT_X224);
 228         asm volatile(
 229                 "       diag    %1,%2,0x224\n"
 230                 "0:     lhi     %0,0x0\n"
 231                 "1:\n"
 232                 EX_TABLE(0b,1b)
 233                 : "+d" (rc) :"d" (0), "d" (ptr) : "memory");
 234         return rc;
 235 }
 236 EXPORT_SYMBOL(diag224);
 237
 238 /*
 239  * Diagnose 26C: Access Certain System Information
 240  */
 241 int diag26c(void *req, void *resp, enum diag26c_sc subcode)
 242 {
 243         diag_stat_inc(DIAG_STAT_X26C);
 244         return diag_amode31_ops.diag26c(req, resp, subcode);
 245 }
 246 EXPORT_SYMBOL(diag26c);