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_X318] = { .code = 0x318, .name = "CP Name and Version Codes" },
  49         [DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" },
  50 };
  51
  52 static int show_diag_stat(struct seq_file *m, void *v)
  53 {
  54         struct diag_stat *stat;
  55         unsigned long n = (unsigned long) v - 1;
  56         int cpu, prec, tmp;
  57
  58         get_online_cpus();
  59         if (n == 0) {
  60                 seq_puts(m, "         ");
  61
  62                 for_each_online_cpu(cpu) {
  63                         prec = 10;
  64                         for (tmp = 10; cpu >= tmp; tmp *= 10)
  65                                 prec--;
  66                         seq_printf(m, "%*s%d", prec, "CPU", cpu);
  67                 }
  68                 seq_putc(m, '\n');
  69         } else if (n <= NR_DIAG_STAT) {
  70                 seq_printf(m, "diag %03x:", diag_map[n-1].code);
  71                 for_each_online_cpu(cpu) {
  72                         stat = &per_cpu(diag_stat, cpu);
  73                         seq_printf(m, " %10u", stat->counter[n-1]);
  74                 }
  75                 seq_printf(m, "    %s\n", diag_map[n-1].name);
  76         }
  77         put_online_cpus();
  78         return 0;
  79 }
  80
  81 static void *show_diag_stat_start(struct seq_file *m, loff_t *pos)
  82 {
  83         return *pos <= nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
  84 }
  85
  86 static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos)
  87 {
  88         ++*pos;
  89         return show_diag_stat_start(m, pos);
  90 }
  91
  92 static void show_diag_stat_stop(struct seq_file *m, void *v)
  93 {
  94 }
  95
  96 static const struct seq_operations show_diag_stat_sops = {
  97         .start  = show_diag_stat_start,
  98         .next   = show_diag_stat_next,
  99         .stop   = show_diag_stat_stop,
 100         .show   = show_diag_stat,
 101 };
 102
 103 static int show_diag_stat_open(struct inode *inode, struct file *file)
 104 {
 105         return seq_open(file, &show_diag_stat_sops);
 106 }
 107
 108 static const struct file_operations show_diag_stat_fops = {
 109         .open           = show_diag_stat_open,
 110         .read           = seq_read,
 111         .llseek         = seq_lseek,
 112         .release        = seq_release,
 113 };
 114
 115
 116 static int __init show_diag_stat_init(void)
 117 {
 118         debugfs_create_file("diag_stat", 0400, NULL, NULL,
 119                             &show_diag_stat_fops);
 120         return 0;
 121 }
 122
 123 device_initcall(show_diag_stat_init);
 124
 125 void diag_stat_inc(enum diag_stat_enum nr)
 126 {
 127         this_cpu_inc(diag_stat.counter[nr]);
 128         trace_s390_diagnose(diag_map[nr].code);
 129 }
 130 EXPORT_SYMBOL(diag_stat_inc);
 131
 132 void diag_stat_inc_norecursion(enum diag_stat_enum nr)
 133 {
 134         this_cpu_inc(diag_stat.counter[nr]);
 135         trace_s390_diagnose_norecursion(diag_map[nr].code);
 136 }
 137 EXPORT_SYMBOL(diag_stat_inc_norecursion);
 138
 139 /*
 140  * Diagnose 14: Input spool file manipulation
 141  */
 142 static inline int __diag14(unsigned long rx, unsigned long ry1,
 143                            unsigned long subcode)
 144 {
 145         register unsigned long _ry1 asm("2") = ry1;
 146         register unsigned long _ry2 asm("3") = subcode;
 147         int rc = 0;
 148
 149         asm volatile(
 150                 "   sam31\n"
 151                 "   diag    %2,2,0x14\n"
 152                 "   sam64\n"
 153                 "   ipm     %0\n"
 154                 "   srl     %0,28\n"
 155                 : "=d" (rc), "+d" (_ry2)
 156                 : "d" (rx), "d" (_ry1)
 157                 : "cc");
 158
 159         return rc;
 160 }
 161
 162 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
 163 {
 164         diag_stat_inc(DIAG_STAT_X014);
 165         return __diag14(rx, ry1, subcode);
 166 }
 167 EXPORT_SYMBOL(diag14);
 168
 169 static inline int __diag204(unsigned long *subcode, unsigned long size, void *addr)
 170 {
 171         register unsigned long _subcode asm("0") = *subcode;
 172         register unsigned long _size asm("1") = size;
 173
 174         asm volatile(
 175                 "       diag    %2,%0,0x204\n"
 176                 "0:     nopr    %%r7\n"
 177                 EX_TABLE(0b,0b)
 178                 : "+d" (_subcode), "+d" (_size) : "d" (addr) : "memory");
 179         *subcode = _subcode;
 180         return _size;
 181 }
 182
 183 int diag204(unsigned long subcode, unsigned long size, void *addr)
 184 {
 185         diag_stat_inc(DIAG_STAT_X204);
 186         size = __diag204(&subcode, size, addr);
 187         if (subcode)
 188                 return -1;
 189         return size;
 190 }
 191 EXPORT_SYMBOL(diag204);
 192
 193 /*
 194  * Diagnose 210: Get information about a virtual device
 195  */
 196 int diag210(struct diag210 *addr)
 197 {
 198         /*
 199          * diag 210 needs its data below the 2GB border, so we
 200          * use a static data area to be sure
 201          */
 202         static struct diag210 diag210_tmp;
 203         static DEFINE_SPINLOCK(diag210_lock);
 204         unsigned long flags;
 205         int ccode;
 206
 207         spin_lock_irqsave(&diag210_lock, flags);
 208         diag210_tmp = *addr;
 209
 210         diag_stat_inc(DIAG_STAT_X210);
 211         asm volatile(
 212                 "       lhi     %0,-1\n"
 213                 "       sam31\n"
 214                 "       diag    %1,0,0x210\n"
 215                 "0:     ipm     %0\n"
 216                 "       srl     %0,28\n"
 217                 "1:     sam64\n"
 218                 EX_TABLE(0b, 1b)
 219                 : "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory");
 220
 221         *addr = diag210_tmp;
 222         spin_unlock_irqrestore(&diag210_lock, flags);
 223
 224         return ccode;
 225 }
 226 EXPORT_SYMBOL(diag210);
 227
 228 int diag224(void *ptr)
 229 {
 230         int rc = -EOPNOTSUPP;
 231
 232         diag_stat_inc(DIAG_STAT_X224);
 233         asm volatile(
 234                 "       diag    %1,%2,0x224\n"
 235                 "0:     lhi     %0,0x0\n"
 236                 "1:\n"
 237                 EX_TABLE(0b,1b)
 238                 : "+d" (rc) :"d" (0), "d" (ptr) : "memory");
 239         return rc;
 240 }
 241 EXPORT_SYMBOL(diag224);
 242
 243 /*
 244  * Diagnose 26C: Access Certain System Information
 245  */
 246 static inline int __diag26c(void *req, void *resp, enum diag26c_sc subcode)
 247 {
 248         register unsigned long _req asm("2") = (addr_t) req;
 249         register unsigned long _resp asm("3") = (addr_t) resp;
 250         register unsigned long _subcode asm("4") = subcode;
 251         register unsigned long _rc asm("5") = -EOPNOTSUPP;
 252
 253         asm volatile(
 254                 "       sam31\n"
 255                 "       diag    %[rx],%[ry],0x26c\n"
 256                 "0:     sam64\n"
 257                 EX_TABLE(0b,0b)
 258                 : "+d" (_rc)
 259                 : [rx] "d" (_req), "d" (_resp), [ry] "d" (_subcode)
 260                 : "cc", "memory");
 261         return _rc;
 262 }
 263
 264 int diag26c(void *req, void *resp, enum diag26c_sc subcode)
 265 {
 266         diag_stat_inc(DIAG_STAT_X26C);
 267         return __diag26c(req, resp, subcode);
 268 }
 269 EXPORT_SYMBOL(diag26c);