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_X08C] = { .code = 0x08c, .name = "Access 3270 Display Device Information" }, 39 [DIAG_STAT_X09C] = { .code = 0x09c, .name = "Relinquish Timeslice" }, 40 [DIAG_STAT_X0DC] = { .code = 0x0dc, .name = "Appldata Control" }, 41 [DIAG_STAT_X204] = { .code = 0x204, .name = "Logical-CPU Utilization" }, 42 [DIAG_STAT_X210] = { .code = 0x210, .name = "Device Information" }, 43 [DIAG_STAT_X224] = { .code = 0x224, .name = "EBCDIC-Name Table" }, 44 [DIAG_STAT_X250] = { .code = 0x250, .name = "Block I/O" }, 45 [DIAG_STAT_X258] = { .code = 0x258, .name = "Page-Reference Services" }, 46 [DIAG_STAT_X26C] = { .code = 0x26c, .name = "Certain System Information" }, 47 [DIAG_STAT_X288] = { .code = 0x288, .name = "Time Bomb" }, 48 [DIAG_STAT_X2C4] = { .code = 0x2c4, .name = "FTP Services" }, 49 [DIAG_STAT_X2FC] = { .code = 0x2fc, .name = "Guest Performance Data" }, 50 [DIAG_STAT_X304] = { .code = 0x304, .name = "Partition-Resource Service" }, 51 [DIAG_STAT_X308] = { .code = 0x308, .name = "List-Directed IPL" }, 52 [DIAG_STAT_X318] = { .code = 0x318, .name = "CP Name and Version Codes" }, 53 [DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" }, 54 }; 55 56 struct diag_ops __amode31_ref diag_amode31_ops = { 57 .diag210 = _diag210_amode31, 58 .diag26c = _diag26c_amode31, 59 .diag14 = _diag14_amode31, 60 .diag0c = _diag0c_amode31, 61 .diag8c = _diag8c_amode31, 62 .diag308_reset = _diag308_reset_amode31 63 }; 64 65 static struct diag210 _diag210_tmp_amode31 __section(".amode31.data"); 66 struct diag210 __amode31_ref *__diag210_tmp_amode31 = &_diag210_tmp_amode31; 67 68 static struct diag8c _diag8c_tmp_amode31 __section(".amode31.data"); 69 static struct diag8c __amode31_ref *__diag8c_tmp_amode31 = &_diag8c_tmp_amode31; 70 71 static int show_diag_stat(struct seq_file *m, void *v) 72 { 73 struct diag_stat *stat; 74 unsigned long n = (unsigned long) v - 1; 75 int cpu, prec, tmp; 76 77 cpus_read_lock(); 78 if (n == 0) { 79 seq_puts(m, " "); 80 81 for_each_online_cpu(cpu) { 82 prec = 10; 83 for (tmp = 10; cpu >= tmp; tmp *= 10) 84 prec--; 85 seq_printf(m, "%*s%d", prec, "CPU", cpu); 86 } 87 seq_putc(m, '\n'); 88 } else if (n <= NR_DIAG_STAT) { 89 seq_printf(m, "diag %03x:", diag_map[n-1].code); 90 for_each_online_cpu(cpu) { 91 stat = &per_cpu(diag_stat, cpu); 92 seq_printf(m, " %10u", stat->counter[n-1]); 93 } 94 seq_printf(m, " %s\n", diag_map[n-1].name); 95 } 96 cpus_read_unlock(); 97 return 0; 98 } 99 100 static void *show_diag_stat_start(struct seq_file *m, loff_t *pos) 101 { 102 return *pos <= NR_DIAG_STAT ? (void *)((unsigned long) *pos + 1) : NULL; 103 } 104 105 static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos) 106 { 107 ++*pos; 108 return show_diag_stat_start(m, pos); 109 } 110 111 static void show_diag_stat_stop(struct seq_file *m, void *v) 112 { 113 } 114 115 static const struct seq_operations show_diag_stat_sops = { 116 .start = show_diag_stat_start, 117 .next = show_diag_stat_next, 118 .stop = show_diag_stat_stop, 119 .show = show_diag_stat, 120 }; 121 122 DEFINE_SEQ_ATTRIBUTE(show_diag_stat); 123 124 static int __init show_diag_stat_init(void) 125 { 126 debugfs_create_file("diag_stat", 0400, NULL, NULL, 127 &show_diag_stat_fops); 128 return 0; 129 } 130 131 device_initcall(show_diag_stat_init); 132 133 void diag_stat_inc(enum diag_stat_enum nr) 134 { 135 this_cpu_inc(diag_stat.counter[nr]); 136 trace_s390_diagnose(diag_map[nr].code); 137 } 138 EXPORT_SYMBOL(diag_stat_inc); 139 140 void notrace diag_stat_inc_norecursion(enum diag_stat_enum nr) 141 { 142 this_cpu_inc(diag_stat.counter[nr]); 143 trace_s390_diagnose_norecursion(diag_map[nr].code); 144 } 145 EXPORT_SYMBOL(diag_stat_inc_norecursion); 146 147 /* 148 * Diagnose 14: Input spool file manipulation 149 */ 150 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode) 151 { 152 diag_stat_inc(DIAG_STAT_X014); 153 return diag_amode31_ops.diag14(rx, ry1, subcode); 154 } 155 EXPORT_SYMBOL(diag14); 156 157 static inline int __diag204(unsigned long *subcode, unsigned long size, void *addr) 158 { 159 union register_pair rp = { .even = *subcode, .odd = size }; 160 161 asm volatile( 162 " diag %[addr],%[rp],0x204\n" 163 "0: nopr %%r7\n" 164 EX_TABLE(0b,0b) 165 : [rp] "+&d" (rp.pair) : [addr] "d" (addr) : "memory"); 166 *subcode = rp.even; 167 return rp.odd; 168 } 169 170 int diag204(unsigned long subcode, unsigned long size, void *addr) 171 { 172 diag_stat_inc(DIAG_STAT_X204); 173 size = __diag204(&subcode, size, addr); 174 if (subcode) 175 return -1; 176 return size; 177 } 178 EXPORT_SYMBOL(diag204); 179 180 /* 181 * Diagnose 210: Get information about a virtual device 182 */ 183 int diag210(struct diag210 *addr) 184 { 185 static DEFINE_SPINLOCK(diag210_lock); 186 unsigned long flags; 187 int ccode; 188 189 spin_lock_irqsave(&diag210_lock, flags); 190 *__diag210_tmp_amode31 = *addr; 191 192 diag_stat_inc(DIAG_STAT_X210); 193 ccode = diag_amode31_ops.diag210(__diag210_tmp_amode31); 194 195 *addr = *__diag210_tmp_amode31; 196 spin_unlock_irqrestore(&diag210_lock, flags); 197 198 return ccode; 199 } 200 EXPORT_SYMBOL(diag210); 201 202 /* 203 * Diagnose 210: Get information about a virtual device 204 */ 205 int diag8c(struct diag8c *addr, struct ccw_dev_id *devno) 206 { 207 static DEFINE_SPINLOCK(diag8c_lock); 208 unsigned long flags; 209 int ccode; 210 211 spin_lock_irqsave(&diag8c_lock, flags); 212 213 diag_stat_inc(DIAG_STAT_X08C); 214 ccode = diag_amode31_ops.diag8c(__diag8c_tmp_amode31, devno, sizeof(*addr)); 215 216 *addr = *__diag8c_tmp_amode31; 217 spin_unlock_irqrestore(&diag8c_lock, flags); 218 219 return ccode; 220 } 221 EXPORT_SYMBOL(diag8c); 222 223 int diag224(void *ptr) 224 { 225 int rc = -EOPNOTSUPP; 226 227 diag_stat_inc(DIAG_STAT_X224); 228 asm volatile( 229 " diag %1,%2,0x224\n" 230 "0: lhi %0,0x0\n" 231 "1:\n" 232 EX_TABLE(0b,1b) 233 : "+d" (rc) :"d" (0), "d" (ptr) : "memory"); 234 return rc; 235 } 236 EXPORT_SYMBOL(diag224); 237 238 /* 239 * Diagnose 26C: Access Certain System Information 240 */ 241 int diag26c(void *req, void *resp, enum diag26c_sc subcode) 242 { 243 diag_stat_inc(DIAG_STAT_X26C); 244 return diag_amode31_ops.diag26c(req, resp, subcode); 245 } 246 EXPORT_SYMBOL(diag26c); 247