arch/s390/kernel/diag.c

   1 /*
   2  * Implementation of s390 diagnose codes
   3  *
   4  * Copyright IBM Corp. 2007
   5  * Author(s): Michael Holzheu <holzheu@de.ibm.com>
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/cpu.h>
  10 #include <linux/seq_file.h>
  11 #include <linux/debugfs.h>
  12 #include <asm/diag.h>
  13 #include <asm/trace/diag.h>
  14
  15 struct diag_stat {
  16         unsigned int counter[NR_DIAG_STAT];
  17 };
  18
  19 static DEFINE_PER_CPU(struct diag_stat, diag_stat);
  20
  21 struct diag_desc {
  22         int code;
  23         char *name;
  24 };
  25
  26 static const struct diag_desc diag_map[NR_DIAG_STAT] = {
  27         [DIAG_STAT_X008] = { .code = 0x008, .name = "Console Function" },
  28         [DIAG_STAT_X00C] = { .code = 0x00c, .name = "Pseudo Timer" },
  29         [DIAG_STAT_X010] = { .code = 0x010, .name = "Release Pages" },
  30         [DIAG_STAT_X014] = { .code = 0x014, .name = "Spool File Services" },
  31         [DIAG_STAT_X044] = { .code = 0x044, .name = "Voluntary Timeslice End" },
  32         [DIAG_STAT_X064] = { .code = 0x064, .name = "NSS Manipulation" },
  33         [DIAG_STAT_X09C] = { .code = 0x09c, .name = "Relinquish Timeslice" },
  34         [DIAG_STAT_X0DC] = { .code = 0x0dc, .name = "Appldata Control" },
  35         [DIAG_STAT_X204] = { .code = 0x204, .name = "Logical-CPU Utilization" },
  36         [DIAG_STAT_X210] = { .code = 0x210, .name = "Device Information" },
  37         [DIAG_STAT_X224] = { .code = 0x224, .name = "EBCDIC-Name Table" },
  38         [DIAG_STAT_X250] = { .code = 0x250, .name = "Block I/O" },
  39         [DIAG_STAT_X258] = { .code = 0x258, .name = "Page-Reference Services" },
  40         [DIAG_STAT_X288] = { .code = 0x288, .name = "Time Bomb" },
  41         [DIAG_STAT_X2C4] = { .code = 0x2c4, .name = "FTP Services" },
  42         [DIAG_STAT_X2FC] = { .code = 0x2fc, .name = "Guest Performance Data" },
  43         [DIAG_STAT_X304] = { .code = 0x304, .name = "Partition-Resource Service" },
  44         [DIAG_STAT_X308] = { .code = 0x308, .name = "List-Directed IPL" },
  45         [DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" },
  46 };
  47
  48 static int show_diag_stat(struct seq_file *m, void *v)
  49 {
  50         struct diag_stat *stat;
  51         unsigned long n = (unsigned long) v - 1;
  52         int cpu, prec, tmp;
  53
  54         get_online_cpus();
  55         if (n == 0) {
  56                 seq_puts(m, "         ");
  57
  58                 for_each_online_cpu(cpu) {
  59                         prec = 10;
  60                         for (tmp = 10; cpu >= tmp; tmp *= 10)
  61                                 prec--;
  62                         seq_printf(m, "%*s%d", prec, "CPU", cpu);
  63                 }
  64                 seq_putc(m, '\n');
  65         } else if (n <= NR_DIAG_STAT) {
  66                 seq_printf(m, "diag %03x:", diag_map[n-1].code);
  67                 for_each_online_cpu(cpu) {
  68                         stat = &per_cpu(diag_stat, cpu);
  69                         seq_printf(m, " %10u", stat->counter[n-1]);
  70                 }
  71                 seq_printf(m, "    %s\n", diag_map[n-1].name);
  72         }
  73         put_online_cpus();
  74         return 0;
  75 }
  76
  77 static void *show_diag_stat_start(struct seq_file *m, loff_t *pos)
  78 {
  79         return *pos <= nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
  80 }
  81
  82 static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos)
  83 {
  84         ++*pos;
  85         return show_diag_stat_start(m, pos);
  86 }
  87
  88 static void show_diag_stat_stop(struct seq_file *m, void *v)
  89 {
  90 }
  91
  92 static const struct seq_operations show_diag_stat_sops = {
  93         .start  = show_diag_stat_start,
  94         .next   = show_diag_stat_next,
  95         .stop   = show_diag_stat_stop,
  96         .show   = show_diag_stat,
  97 };
  98
  99 static int show_diag_stat_open(struct inode *inode, struct file *file)
 100 {
 101         return seq_open(file, &show_diag_stat_sops);
 102 }
 103
 104 static const struct file_operations show_diag_stat_fops = {
 105         .open           = show_diag_stat_open,
 106         .read           = seq_read,
 107         .llseek         = seq_lseek,
 108         .release        = seq_release,
 109 };
 110
 111
 112 static int __init show_diag_stat_init(void)
 113 {
 114         debugfs_create_file("diag_stat", 0400, NULL, NULL,
 115                             &show_diag_stat_fops);
 116         return 0;
 117 }
 118
 119 device_initcall(show_diag_stat_init);
 120
 121 void diag_stat_inc(enum diag_stat_enum nr)
 122 {
 123         this_cpu_inc(diag_stat.counter[nr]);
 124         trace_s390_diagnose(diag_map[nr].code);
 125 }
 126 EXPORT_SYMBOL(diag_stat_inc);
 127
 128 void diag_stat_inc_norecursion(enum diag_stat_enum nr)
 129 {
 130         this_cpu_inc(diag_stat.counter[nr]);
 131         trace_s390_diagnose_norecursion(diag_map[nr].code);
 132 }
 133 EXPORT_SYMBOL(diag_stat_inc_norecursion);
 134
 135 /*
 136  * Diagnose 14: Input spool file manipulation
 137  */
 138 static inline int __diag14(unsigned long rx, unsigned long ry1,
 139                            unsigned long subcode)
 140 {
 141         register unsigned long _ry1 asm("2") = ry1;
 142         register unsigned long _ry2 asm("3") = subcode;
 143         int rc = 0;
 144
 145         asm volatile(
 146                 "   sam31\n"
 147                 "   diag    %2,2,0x14\n"
 148                 "   sam64\n"
 149                 "   ipm     %0\n"
 150                 "   srl     %0,28\n"
 151                 : "=d" (rc), "+d" (_ry2)
 152                 : "d" (rx), "d" (_ry1)
 153                 : "cc");
 154
 155         return rc;
 156 }
 157
 158 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
 159 {
 160         diag_stat_inc(DIAG_STAT_X014);
 161         return __diag14(rx, ry1, subcode);
 162 }
 163 EXPORT_SYMBOL(diag14);
 164
 165 /*
 166  * Diagnose 210: Get information about a virtual device
 167  */
 168 int diag210(struct diag210 *addr)
 169 {
 170         /*
 171          * diag 210 needs its data below the 2GB border, so we
 172          * use a static data area to be sure
 173          */
 174         static struct diag210 diag210_tmp;
 175         static DEFINE_SPINLOCK(diag210_lock);
 176         unsigned long flags;
 177         int ccode;
 178
 179         spin_lock_irqsave(&diag210_lock, flags);
 180         diag210_tmp = *addr;
 181
 182         diag_stat_inc(DIAG_STAT_X210);
 183         asm volatile(
 184                 "       lhi     %0,-1\n"
 185                 "       sam31\n"
 186                 "       diag    %1,0,0x210\n"
 187                 "0:     ipm     %0\n"
 188                 "       srl     %0,28\n"
 189                 "1:     sam64\n"
 190                 EX_TABLE(0b, 1b)
 191                 : "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory");
 192
 193         *addr = diag210_tmp;
 194         spin_unlock_irqrestore(&diag210_lock, flags);
 195
 196         return ccode;
 197 }
 198 EXPORT_SYMBOL(diag210);