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
  17 struct diag_stat {
  18         unsigned int counter[NR_DIAG_STAT];
  19 };
  20
  21 static DEFINE_PER_CPU(struct diag_stat, diag_stat);
  22
  23 struct diag_desc {
  24         int code;
  25         char *name;
  26 };
  27
  28 static const struct diag_desc diag_map[NR_DIAG_STAT] = {
  29         [DIAG_STAT_X008] = { .code = 0x008, .name = "Console Function" },
  30         [DIAG_STAT_X00C] = { .code = 0x00c, .name = "Pseudo Timer" },
  31         [DIAG_STAT_X010] = { .code = 0x010, .name = "Release Pages" },
  32         [DIAG_STAT_X014] = { .code = 0x014, .name = "Spool File Services" },
  33         [DIAG_STAT_X044] = { .code = 0x044, .name = "Voluntary Timeslice End" },
  34         [DIAG_STAT_X064] = { .code = 0x064, .name = "NSS Manipulation" },
  35         [DIAG_STAT_X09C] = { .code = 0x09c, .name = "Relinquish Timeslice" },
  36         [DIAG_STAT_X0DC] = { .code = 0x0dc, .name = "Appldata Control" },
  37         [DIAG_STAT_X204] = { .code = 0x204, .name = "Logical-CPU Utilization" },
  38         [DIAG_STAT_X210] = { .code = 0x210, .name = "Device Information" },
  39         [DIAG_STAT_X224] = { .code = 0x224, .name = "EBCDIC-Name Table" },
  40         [DIAG_STAT_X250] = { .code = 0x250, .name = "Block I/O" },
  41         [DIAG_STAT_X258] = { .code = 0x258, .name = "Page-Reference Services" },
  42         [DIAG_STAT_X26C] = { .code = 0x26c, .name = "Certain System Information" },
  43         [DIAG_STAT_X288] = { .code = 0x288, .name = "Time Bomb" },
  44         [DIAG_STAT_X2C4] = { .code = 0x2c4, .name = "FTP Services" },
  45         [DIAG_STAT_X2FC] = { .code = 0x2fc, .name = "Guest Performance Data" },
  46         [DIAG_STAT_X304] = { .code = 0x304, .name = "Partition-Resource Service" },
  47         [DIAG_STAT_X308] = { .code = 0x308, .name = "List-Directed IPL" },
  48         [DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" },
  49 };
  50
  51 static int show_diag_stat(struct seq_file *m, void *v)
  52 {
  53         struct diag_stat *stat;
  54         unsigned long n = (unsigned long) v - 1;
  55         int cpu, prec, tmp;
  56
  57         get_online_cpus();
  58         if (n == 0) {
  59                 seq_puts(m, "         ");
  60
  61                 for_each_online_cpu(cpu) {
  62                         prec = 10;
  63                         for (tmp = 10; cpu >= tmp; tmp *= 10)
  64                                 prec--;
  65                         seq_printf(m, "%*s%d", prec, "CPU", cpu);
  66                 }
  67                 seq_putc(m, '\n');
  68         } else if (n <= NR_DIAG_STAT) {
  69                 seq_printf(m, "diag %03x:", diag_map[n-1].code);
  70                 for_each_online_cpu(cpu) {
  71                         stat = &per_cpu(diag_stat, cpu);
  72                         seq_printf(m, " %10u", stat->counter[n-1]);
  73                 }
  74                 seq_printf(m, "    %s\n", diag_map[n-1].name);
  75         }
  76         put_online_cpus();
  77         return 0;
  78 }
  79
  80 static void *show_diag_stat_start(struct seq_file *m, loff_t *pos)
  81 {
  82         return *pos <= nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
  83 }
  84
  85 static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos)
  86 {
  87         ++*pos;
  88         return show_diag_stat_start(m, pos);
  89 }
  90
  91 static void show_diag_stat_stop(struct seq_file *m, void *v)
  92 {
  93 }
  94
  95 static const struct seq_operations show_diag_stat_sops = {
  96         .start  = show_diag_stat_start,
  97         .next   = show_diag_stat_next,
  98         .stop   = show_diag_stat_stop,
  99         .show   = show_diag_stat,
 100 };
 101
 102 static int show_diag_stat_open(struct inode *inode, struct file *file)
 103 {
 104         return seq_open(file, &show_diag_stat_sops);
 105 }
 106
 107 static const struct file_operations show_diag_stat_fops = {
 108         .open           = show_diag_stat_open,
 109         .read           = seq_read,
 110         .llseek         = seq_lseek,
 111         .release        = seq_release,
 112 };
 113
 114
 115 static int __init show_diag_stat_init(void)
 116 {
 117         debugfs_create_file("diag_stat", 0400, NULL, NULL,
 118                             &show_diag_stat_fops);
 119         return 0;
 120 }
 121
 122 device_initcall(show_diag_stat_init);
 123
 124 void diag_stat_inc(enum diag_stat_enum nr)
 125 {
 126         this_cpu_inc(diag_stat.counter[nr]);
 127         trace_s390_diagnose(diag_map[nr].code);
 128 }
 129 EXPORT_SYMBOL(diag_stat_inc);
 130
 131 void diag_stat_inc_norecursion(enum diag_stat_enum nr)
 132 {
 133         this_cpu_inc(diag_stat.counter[nr]);
 134         trace_s390_diagnose_norecursion(diag_map[nr].code);
 135 }
 136 EXPORT_SYMBOL(diag_stat_inc_norecursion);
 137
 138 /*
 139  * Diagnose 14: Input spool file manipulation
 140  */
 141 static inline int __diag14(unsigned long rx, unsigned long ry1,
 142                            unsigned long subcode)
 143 {
 144         register unsigned long _ry1 asm("2") = ry1;
 145         register unsigned long _ry2 asm("3") = subcode;
 146         int rc = 0;
 147
 148         asm volatile(
 149                 "   sam31\n"
 150                 "   diag    %2,2,0x14\n"
 151                 "   sam64\n"
 152                 "   ipm     %0\n"
 153                 "   srl     %0,28\n"
 154                 : "=d" (rc), "+d" (_ry2)
 155                 : "d" (rx), "d" (_ry1)
 156                 : "cc");
 157
 158         return rc;
 159 }
 160
 161 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
 162 {
 163         diag_stat_inc(DIAG_STAT_X014);
 164         return __diag14(rx, ry1, subcode);
 165 }
 166 EXPORT_SYMBOL(diag14);
 167
 168 static inline int __diag204(unsigned long *subcode, unsigned long size, void *addr)
 169 {
 170         register unsigned long _subcode asm("0") = *subcode;
 171         register unsigned long _size asm("1") = size;
 172
 173         asm volatile(
 174                 "       diag    %2,%0,0x204\n"
 175                 "0:     nopr    %%r7\n"
 176                 EX_TABLE(0b,0b)
 177                 : "+d" (_subcode), "+d" (_size) : "d" (addr) : "memory");
 178         *subcode = _subcode;
 179         return _size;
 180 }
 181
 182 int diag204(unsigned long subcode, unsigned long size, void *addr)
 183 {
 184         diag_stat_inc(DIAG_STAT_X204);
 185         size = __diag204(&subcode, size, addr);
 186         if (subcode)
 187                 return -1;
 188         return size;
 189 }
 190 EXPORT_SYMBOL(diag204);
 191
 192 /*
 193  * Diagnose 210: Get information about a virtual device
 194  */
 195 int diag210(struct diag210 *addr)
 196 {
 197         /*
 198          * diag 210 needs its data below the 2GB border, so we
 199          * use a static data area to be sure
 200          */
 201         static struct diag210 diag210_tmp;
 202         static DEFINE_SPINLOCK(diag210_lock);
 203         unsigned long flags;
 204         int ccode;
 205
 206         spin_lock_irqsave(&diag210_lock, flags);
 207         diag210_tmp = *addr;
 208
 209         diag_stat_inc(DIAG_STAT_X210);
 210         asm volatile(
 211                 "       lhi     %0,-1\n"
 212                 "       sam31\n"
 213                 "       diag    %1,0,0x210\n"
 214                 "0:     ipm     %0\n"
 215                 "       srl     %0,28\n"
 216                 "1:     sam64\n"
 217                 EX_TABLE(0b, 1b)
 218                 : "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory");
 219
 220         *addr = diag210_tmp;
 221         spin_unlock_irqrestore(&diag210_lock, flags);
 222
 223         return ccode;
 224 }
 225 EXPORT_SYMBOL(diag210);
 226
 227 int diag224(void *ptr)
 228 {
 229         int rc = -EOPNOTSUPP;
 230
 231         diag_stat_inc(DIAG_STAT_X224);
 232         asm volatile(
 233                 "       diag    %1,%2,0x224\n"
 234                 "0:     lhi     %0,0x0\n"
 235                 "1:\n"
 236                 EX_TABLE(0b,1b)
 237                 : "+d" (rc) :"d" (0), "d" (ptr) : "memory");
 238         return rc;
 239 }
 240 EXPORT_SYMBOL(diag224);
 241
 242 /*
 243  * Diagnose 26C: Access Certain System Information
 244  */
 245 static inline int __diag26c(void *req, void *resp, enum diag26c_sc subcode)
 246 {
 247         register unsigned long _req asm("2") = (addr_t) req;
 248         register unsigned long _resp asm("3") = (addr_t) resp;
 249         register unsigned long _subcode asm("4") = subcode;
 250         register unsigned long _rc asm("5") = -EOPNOTSUPP;
 251
 252         asm volatile(
 253                 "       sam31\n"
 254                 "       diag    %[rx],%[ry],0x26c\n"
 255                 "0:     sam64\n"
 256                 EX_TABLE(0b,0b)
 257                 : "+d" (_rc)
 258                 : [rx] "d" (_req), "d" (_resp), [ry] "d" (_subcode)
 259                 : "cc", "memory");
 260         return _rc;
 261 }
 262
 263 int diag26c(void *req, void *resp, enum diag26c_sc subcode)
 264 {
 265         diag_stat_inc(DIAG_STAT_X26C);
 266         return __diag26c(req, resp, subcode);
 267 }
 268 EXPORT_SYMBOL(diag26c);