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/asm-extable.h> 15 #include <asm/diag.h> 16 #include <asm/trace/diag.h> 17 #include <asm/sections.h> 18 #include "entry.h" 19 20 struct diag_stat { 21 unsigned int counter[NR_DIAG_STAT]; 22 }; 23 24 static DEFINE_PER_CPU(struct diag_stat, diag_stat); 25 26 struct diag_desc { 27 int code; 28 char *name; 29 }; 30 31 static const struct diag_desc diag_map[NR_DIAG_STAT] = { 32 [DIAG_STAT_X008] = { .code = 0x008, .name = "Console Function" }, 33 [DIAG_STAT_X00C] = { .code = 0x00c, .name = "Pseudo Timer" }, 34 [DIAG_STAT_X010] = { .code = 0x010, .name = "Release Pages" }, 35 [DIAG_STAT_X014] = { .code = 0x014, .name = "Spool File Services" }, 36 [DIAG_STAT_X044] = { .code = 0x044, .name = "Voluntary Timeslice End" }, 37 [DIAG_STAT_X064] = { .code = 0x064, .name = "NSS Manipulation" }, 38 [DIAG_STAT_X09C] = { .code = 0x09c, .name = "Relinquish Timeslice" }, 39 [DIAG_STAT_X0DC] = { .code = 0x0dc, .name = "Appldata Control" }, 40 [DIAG_STAT_X204] = { .code = 0x204, .name = "Logical-CPU Utilization" }, 41 [DIAG_STAT_X210] = { .code = 0x210, .name = "Device Information" }, 42 [DIAG_STAT_X224] = { .code = 0x224, .name = "EBCDIC-Name Table" }, 43 [DIAG_STAT_X250] = { .code = 0x250, .name = "Block I/O" }, 44 [DIAG_STAT_X258] = { .code = 0x258, .name = "Page-Reference Services" }, 45 [DIAG_STAT_X26C] = { .code = 0x26c, .name = "Certain System Information" }, 46 [DIAG_STAT_X288] = { .code = 0x288, .name = "Time Bomb" }, 47 [DIAG_STAT_X2C4] = { .code = 0x2c4, .name = "FTP Services" }, 48 [DIAG_STAT_X2FC] = { .code = 0x2fc, .name = "Guest Performance Data" }, 49 [DIAG_STAT_X304] = { .code = 0x304, .name = "Partition-Resource Service" }, 50 [DIAG_STAT_X308] = { .code = 0x308, .name = "List-Directed IPL" }, 51 [DIAG_STAT_X318] = { .code = 0x318, .name = "CP Name and Version Codes" }, 52 [DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" }, 53 }; 54 55 struct diag_ops __amode31_ref diag_amode31_ops = { 56 .diag210 = _diag210_amode31, 57 .diag26c = _diag26c_amode31, 58 .diag14 = _diag14_amode31, 59 .diag0c = _diag0c_amode31, 60 .diag308_reset = _diag308_reset_amode31 61 }; 62 63 static struct diag210 _diag210_tmp_amode31 __section(".amode31.data"); 64 struct diag210 __amode31_ref *__diag210_tmp_amode31 = &_diag210_tmp_amode31; 65 66 static int show_diag_stat(struct seq_file *m, void *v) 67 { 68 struct diag_stat *stat; 69 unsigned long n = (unsigned long) v - 1; 70 int cpu, prec, tmp; 71 72 cpus_read_lock(); 73 if (n == 0) { 74 seq_puts(m, " "); 75 76 for_each_online_cpu(cpu) { 77 prec = 10; 78 for (tmp = 10; cpu >= tmp; tmp *= 10) 79 prec--; 80 seq_printf(m, "%*s%d", prec, "CPU", cpu); 81 } 82 seq_putc(m, '\n'); 83 } else if (n <= NR_DIAG_STAT) { 84 seq_printf(m, "diag %03x:", diag_map[n-1].code); 85 for_each_online_cpu(cpu) { 86 stat = &per_cpu(diag_stat, cpu); 87 seq_printf(m, " %10u", stat->counter[n-1]); 88 } 89 seq_printf(m, " %s\n", diag_map[n-1].name); 90 } 91 cpus_read_unlock(); 92 return 0; 93 } 94 95 static void *show_diag_stat_start(struct seq_file *m, loff_t *pos) 96 { 97 return *pos <= NR_DIAG_STAT ? (void *)((unsigned long) *pos + 1) : NULL; 98 } 99 100 static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos) 101 { 102 ++*pos; 103 return show_diag_stat_start(m, pos); 104 } 105 106 static void show_diag_stat_stop(struct seq_file *m, void *v) 107 { 108 } 109 110 static const struct seq_operations show_diag_stat_sops = { 111 .start = show_diag_stat_start, 112 .next = show_diag_stat_next, 113 .stop = show_diag_stat_stop, 114 .show = show_diag_stat, 115 }; 116 117 DEFINE_SEQ_ATTRIBUTE(show_diag_stat); 118 119 static int __init show_diag_stat_init(void) 120 { 121 debugfs_create_file("diag_stat", 0400, NULL, NULL, 122 &show_diag_stat_fops); 123 return 0; 124 } 125 126 device_initcall(show_diag_stat_init); 127 128 void diag_stat_inc(enum diag_stat_enum nr) 129 { 130 this_cpu_inc(diag_stat.counter[nr]); 131 trace_s390_diagnose(diag_map[nr].code); 132 } 133 EXPORT_SYMBOL(diag_stat_inc); 134 135 void notrace diag_stat_inc_norecursion(enum diag_stat_enum nr) 136 { 137 this_cpu_inc(diag_stat.counter[nr]); 138 trace_s390_diagnose_norecursion(diag_map[nr].code); 139 } 140 EXPORT_SYMBOL(diag_stat_inc_norecursion); 141 142 /* 143 * Diagnose 14: Input spool file manipulation 144 */ 145 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode) 146 { 147 diag_stat_inc(DIAG_STAT_X014); 148 return diag_amode31_ops.diag14(rx, ry1, subcode); 149 } 150 EXPORT_SYMBOL(diag14); 151 152 static inline int __diag204(unsigned long *subcode, unsigned long size, void *addr) 153 { 154 union register_pair rp = { .even = *subcode, .odd = size }; 155 156 asm volatile( 157 " diag %[addr],%[rp],0x204\n" 158 "0: nopr %%r7\n" 159 EX_TABLE(0b,0b) 160 : [rp] "+&d" (rp.pair) : [addr] "d" (addr) : "memory"); 161 *subcode = rp.even; 162 return rp.odd; 163 } 164 165 int diag204(unsigned long subcode, unsigned long size, void *addr) 166 { 167 diag_stat_inc(DIAG_STAT_X204); 168 size = __diag204(&subcode, size, addr); 169 if (subcode) 170 return -1; 171 return size; 172 } 173 EXPORT_SYMBOL(diag204); 174 175 /* 176 * Diagnose 210: Get information about a virtual device 177 */ 178 int diag210(struct diag210 *addr) 179 { 180 static DEFINE_SPINLOCK(diag210_lock); 181 unsigned long flags; 182 int ccode; 183 184 spin_lock_irqsave(&diag210_lock, flags); 185 *__diag210_tmp_amode31 = *addr; 186 187 diag_stat_inc(DIAG_STAT_X210); 188 ccode = diag_amode31_ops.diag210(__diag210_tmp_amode31); 189 190 *addr = *__diag210_tmp_amode31; 191 spin_unlock_irqrestore(&diag210_lock, flags); 192 193 return ccode; 194 } 195 EXPORT_SYMBOL(diag210); 196 197 int diag224(void *ptr) 198 { 199 int rc = -EOPNOTSUPP; 200 201 diag_stat_inc(DIAG_STAT_X224); 202 asm volatile( 203 " diag %1,%2,0x224\n" 204 "0: lhi %0,0x0\n" 205 "1:\n" 206 EX_TABLE(0b,1b) 207 : "+d" (rc) :"d" (0), "d" (ptr) : "memory"); 208 return rc; 209 } 210 EXPORT_SYMBOL(diag224); 211 212 /* 213 * Diagnose 26C: Access Certain System Information 214 */ 215 int diag26c(void *req, void *resp, enum diag26c_sc subcode) 216 { 217 diag_stat_inc(DIAG_STAT_X26C); 218 return diag_amode31_ops.diag26c(req, resp, subcode); 219 } 220 EXPORT_SYMBOL(diag26c); 221