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