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
  18 struct diag_stat {
  19         unsigned int counter[NR_DIAG_STAT];
  20 };
  21
  22 static DEFINE_PER_CPU(struct diag_stat, diag_stat);
  23
  24 struct diag_desc {
  25         int code;
  26         char *name;
  27 };
  28
  29 static const struct diag_desc diag_map[NR_DIAG_STAT] = {
  30         [DIAG_STAT_X008] = { .code = 0x008, .name = "Console Function" },
  31         [DIAG_STAT_X00C] = { .code = 0x00c, .name = "Pseudo Timer" },
  32         [DIAG_STAT_X010] = { .code = 0x010, .name = "Release Pages" },
  33         [DIAG_STAT_X014] = { .code = 0x014, .name = "Spool File Services" },
  34         [DIAG_STAT_X044] = { .code = 0x044, .name = "Voluntary Timeslice End" },
  35         [DIAG_STAT_X064] = { .code = 0x064, .name = "NSS Manipulation" },
  36         [DIAG_STAT_X09C] = { .code = 0x09c, .name = "Relinquish Timeslice" },
  37         [DIAG_STAT_X0DC] = { .code = 0x0dc, .name = "Appldata Control" },
  38         [DIAG_STAT_X204] = { .code = 0x204, .name = "Logical-CPU Utilization" },
  39         [DIAG_STAT_X210] = { .code = 0x210, .name = "Device Information" },
  40         [DIAG_STAT_X224] = { .code = 0x224, .name = "EBCDIC-Name Table" },
  41         [DIAG_STAT_X250] = { .code = 0x250, .name = "Block I/O" },
  42         [DIAG_STAT_X258] = { .code = 0x258, .name = "Page-Reference Services" },
  43         [DIAG_STAT_X26C] = { .code = 0x26c, .name = "Certain System Information" },
  44         [DIAG_STAT_X288] = { .code = 0x288, .name = "Time Bomb" },
  45         [DIAG_STAT_X2C4] = { .code = 0x2c4, .name = "FTP Services" },
  46         [DIAG_STAT_X2FC] = { .code = 0x2fc, .name = "Guest Performance Data" },
  47         [DIAG_STAT_X304] = { .code = 0x304, .name = "Partition-Resource Service" },
  48         [DIAG_STAT_X308] = { .code = 0x308, .name = "List-Directed IPL" },
  49         [DIAG_STAT_X318] = { .code = 0x318, .name = "CP Name and Version Codes" },
  50         [DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" },
  51 };
  52
  53 struct diag_ops __bootdata_preserved(diag_dma_ops);
  54 struct diag210 *__bootdata_preserved(__diag210_tmp_dma);
  55
  56 static int show_diag_stat(struct seq_file *m, void *v)
  57 {
  58         struct diag_stat *stat;
  59         unsigned long n = (unsigned long) v - 1;
  60         int cpu, prec, tmp;
  61
  62         get_online_cpus();
  63         if (n == 0) {
  64                 seq_puts(m, "         ");
  65
  66                 for_each_online_cpu(cpu) {
  67                         prec = 10;
  68                         for (tmp = 10; cpu >= tmp; tmp *= 10)
  69                                 prec--;
  70                         seq_printf(m, "%*s%d", prec, "CPU", cpu);
  71                 }
  72                 seq_putc(m, '\n');
  73         } else if (n <= NR_DIAG_STAT) {
  74                 seq_printf(m, "diag %03x:", diag_map[n-1].code);
  75                 for_each_online_cpu(cpu) {
  76                         stat = &per_cpu(diag_stat, cpu);
  77                         seq_printf(m, " %10u", stat->counter[n-1]);
  78                 }
  79                 seq_printf(m, "    %s\n", diag_map[n-1].name);
  80         }
  81         put_online_cpus();
  82         return 0;
  83 }
  84
  85 static void *show_diag_stat_start(struct seq_file *m, loff_t *pos)
  86 {
  87         return *pos <= NR_DIAG_STAT ? (void *)((unsigned long) *pos + 1) : NULL;
  88 }
  89
  90 static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos)
  91 {
  92         ++*pos;
  93         return show_diag_stat_start(m, pos);
  94 }
  95
  96 static void show_diag_stat_stop(struct seq_file *m, void *v)
  97 {
  98 }
  99
 100 static const struct seq_operations show_diag_stat_sops = {
 101         .start  = show_diag_stat_start,
 102         .next   = show_diag_stat_next,
 103         .stop   = show_diag_stat_stop,
 104         .show   = show_diag_stat,
 105 };
 106
 107 static int show_diag_stat_open(struct inode *inode, struct file *file)
 108 {
 109         return seq_open(file, &show_diag_stat_sops);
 110 }
 111
 112 static const struct file_operations show_diag_stat_fops = {
 113         .open           = show_diag_stat_open,
 114         .read           = seq_read,
 115         .llseek         = seq_lseek,
 116         .release        = seq_release,
 117 };
 118
 119
 120 static int __init show_diag_stat_init(void)
 121 {
 122         debugfs_create_file("diag_stat", 0400, NULL, NULL,
 123                             &show_diag_stat_fops);
 124         return 0;
 125 }
 126
 127 device_initcall(show_diag_stat_init);
 128
 129 void diag_stat_inc(enum diag_stat_enum nr)
 130 {
 131         this_cpu_inc(diag_stat.counter[nr]);
 132         trace_s390_diagnose(diag_map[nr].code);
 133 }
 134 EXPORT_SYMBOL(diag_stat_inc);
 135
 136 void notrace diag_stat_inc_norecursion(enum diag_stat_enum nr)
 137 {
 138         this_cpu_inc(diag_stat.counter[nr]);
 139         trace_s390_diagnose_norecursion(diag_map[nr].code);
 140 }
 141 EXPORT_SYMBOL(diag_stat_inc_norecursion);
 142
 143 /*
 144  * Diagnose 14: Input spool file manipulation
 145  */
 146 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
 147 {
 148         diag_stat_inc(DIAG_STAT_X014);
 149         return diag_dma_ops.diag14(rx, ry1, subcode);
 150 }
 151 EXPORT_SYMBOL(diag14);
 152
 153 static inline int __diag204(unsigned long *subcode, unsigned long size, void *addr)
 154 {
 155         register unsigned long _subcode asm("0") = *subcode;
 156         register unsigned long _size asm("1") = size;
 157
 158         asm volatile(
 159                 "       diag    %2,%0,0x204\n"
 160                 "0:     nopr    %%r7\n"
 161                 EX_TABLE(0b,0b)
 162                 : "+d" (_subcode), "+d" (_size) : "d" (addr) : "memory");
 163         *subcode = _subcode;
 164         return _size;
 165 }
 166
 167 int diag204(unsigned long subcode, unsigned long size, void *addr)
 168 {
 169         diag_stat_inc(DIAG_STAT_X204);
 170         size = __diag204(&subcode, size, addr);
 171         if (subcode)
 172                 return -1;
 173         return size;
 174 }
 175 EXPORT_SYMBOL(diag204);
 176
 177 /*
 178  * Diagnose 210: Get information about a virtual device
 179  */
 180 int diag210(struct diag210 *addr)
 181 {
 182         static DEFINE_SPINLOCK(diag210_lock);
 183         unsigned long flags;
 184         int ccode;
 185
 186         spin_lock_irqsave(&diag210_lock, flags);
 187         *__diag210_tmp_dma = *addr;
 188
 189         diag_stat_inc(DIAG_STAT_X210);
 190         ccode = diag_dma_ops.diag210(__diag210_tmp_dma);
 191
 192         *addr = *__diag210_tmp_dma;
 193         spin_unlock_irqrestore(&diag210_lock, flags);
 194
 195         return ccode;
 196 }
 197 EXPORT_SYMBOL(diag210);
 198
 199 int diag224(void *ptr)
 200 {
 201         int rc = -EOPNOTSUPP;
 202
 203         diag_stat_inc(DIAG_STAT_X224);
 204         asm volatile(
 205                 "       diag    %1,%2,0x224\n"
 206                 "0:     lhi     %0,0x0\n"
 207                 "1:\n"
 208                 EX_TABLE(0b,1b)
 209                 : "+d" (rc) :"d" (0), "d" (ptr) : "memory");
 210         return rc;
 211 }
 212 EXPORT_SYMBOL(diag224);
 213
 214 /*
 215  * Diagnose 26C: Access Certain System Information
 216  */
 217 int diag26c(void *req, void *resp, enum diag26c_sc subcode)
 218 {
 219         diag_stat_inc(DIAG_STAT_X26C);
 220         return diag_dma_ops.diag26c(req, resp, subcode);
 221 }
 222 EXPORT_SYMBOL(diag26c);