linux/arch/s390/kernel/diag.c
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   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
  18struct diag_stat {
  19        unsigned int counter[NR_DIAG_STAT];
  20};
  21
  22static DEFINE_PER_CPU(struct diag_stat, diag_stat);
  23
  24struct diag_desc {
  25        int code;
  26        char *name;
  27};
  28
  29static 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
  53struct diag_ops __bootdata_preserved(diag_dma_ops);
  54struct diag210 *__bootdata_preserved(__diag210_tmp_dma);
  55
  56static 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
  85static 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
  90static 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
  96static void show_diag_stat_stop(struct seq_file *m, void *v)
  97{
  98}
  99
 100static 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
 107DEFINE_SEQ_ATTRIBUTE(show_diag_stat);
 108
 109static int __init show_diag_stat_init(void)
 110{
 111        debugfs_create_file("diag_stat", 0400, NULL, NULL,
 112                            &show_diag_stat_fops);
 113        return 0;
 114}
 115
 116device_initcall(show_diag_stat_init);
 117
 118void diag_stat_inc(enum diag_stat_enum nr)
 119{
 120        this_cpu_inc(diag_stat.counter[nr]);
 121        trace_s390_diagnose(diag_map[nr].code);
 122}
 123EXPORT_SYMBOL(diag_stat_inc);
 124
 125void notrace diag_stat_inc_norecursion(enum diag_stat_enum nr)
 126{
 127        this_cpu_inc(diag_stat.counter[nr]);
 128        trace_s390_diagnose_norecursion(diag_map[nr].code);
 129}
 130EXPORT_SYMBOL(diag_stat_inc_norecursion);
 131
 132/*
 133 * Diagnose 14: Input spool file manipulation
 134 */
 135int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
 136{
 137        diag_stat_inc(DIAG_STAT_X014);
 138        return diag_dma_ops.diag14(rx, ry1, subcode);
 139}
 140EXPORT_SYMBOL(diag14);
 141
 142static inline int __diag204(unsigned long *subcode, unsigned long size, void *addr)
 143{
 144        union register_pair rp = { .even = *subcode, .odd = size };
 145
 146        asm volatile(
 147                "       diag    %[addr],%[rp],0x204\n"
 148                "0:     nopr    %%r7\n"
 149                EX_TABLE(0b,0b)
 150                : [rp] "+&d" (rp.pair) : [addr] "d" (addr) : "memory");
 151        *subcode = rp.even;
 152        return rp.odd;
 153}
 154
 155int diag204(unsigned long subcode, unsigned long size, void *addr)
 156{
 157        diag_stat_inc(DIAG_STAT_X204);
 158        size = __diag204(&subcode, size, addr);
 159        if (subcode)
 160                return -1;
 161        return size;
 162}
 163EXPORT_SYMBOL(diag204);
 164
 165/*
 166 * Diagnose 210: Get information about a virtual device
 167 */
 168int diag210(struct diag210 *addr)
 169{
 170        static DEFINE_SPINLOCK(diag210_lock);
 171        unsigned long flags;
 172        int ccode;
 173
 174        spin_lock_irqsave(&diag210_lock, flags);
 175        *__diag210_tmp_dma = *addr;
 176
 177        diag_stat_inc(DIAG_STAT_X210);
 178        ccode = diag_dma_ops.diag210(__diag210_tmp_dma);
 179
 180        *addr = *__diag210_tmp_dma;
 181        spin_unlock_irqrestore(&diag210_lock, flags);
 182
 183        return ccode;
 184}
 185EXPORT_SYMBOL(diag210);
 186
 187int diag224(void *ptr)
 188{
 189        int rc = -EOPNOTSUPP;
 190
 191        diag_stat_inc(DIAG_STAT_X224);
 192        asm volatile(
 193                "       diag    %1,%2,0x224\n"
 194                "0:     lhi     %0,0x0\n"
 195                "1:\n"
 196                EX_TABLE(0b,1b)
 197                : "+d" (rc) :"d" (0), "d" (ptr) : "memory");
 198        return rc;
 199}
 200EXPORT_SYMBOL(diag224);
 201
 202/*
 203 * Diagnose 26C: Access Certain System Information
 204 */
 205int diag26c(void *req, void *resp, enum diag26c_sc subcode)
 206{
 207        diag_stat_inc(DIAG_STAT_X26C);
 208        return diag_dma_ops.diag26c(req, resp, subcode);
 209}
 210EXPORT_SYMBOL(diag26c);
 211
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