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 17 struct diag_stat { 18 unsigned int counter[NR_DIAG_STAT]; 19 }; 20 21 static DEFINE_PER_CPU(struct diag_stat, diag_stat); 22 23 struct diag_desc { 24 int code; 25 char *name; 26 }; 27 28 static const struct diag_desc diag_map[NR_DIAG_STAT] = { 29 [DIAG_STAT_X008] = { .code = 0x008, .name = "Console Function" }, 30 [DIAG_STAT_X00C] = { .code = 0x00c, .name = "Pseudo Timer" }, 31 [DIAG_STAT_X010] = { .code = 0x010, .name = "Release Pages" }, 32 [DIAG_STAT_X014] = { .code = 0x014, .name = "Spool File Services" }, 33 [DIAG_STAT_X044] = { .code = 0x044, .name = "Voluntary Timeslice End" }, 34 [DIAG_STAT_X064] = { .code = 0x064, .name = "NSS Manipulation" }, 35 [DIAG_STAT_X09C] = { .code = 0x09c, .name = "Relinquish Timeslice" }, 36 [DIAG_STAT_X0DC] = { .code = 0x0dc, .name = "Appldata Control" }, 37 [DIAG_STAT_X204] = { .code = 0x204, .name = "Logical-CPU Utilization" }, 38 [DIAG_STAT_X210] = { .code = 0x210, .name = "Device Information" }, 39 [DIAG_STAT_X224] = { .code = 0x224, .name = "EBCDIC-Name Table" }, 40 [DIAG_STAT_X250] = { .code = 0x250, .name = "Block I/O" }, 41 [DIAG_STAT_X258] = { .code = 0x258, .name = "Page-Reference Services" }, 42 [DIAG_STAT_X26C] = { .code = 0x26c, .name = "Certain System Information" }, 43 [DIAG_STAT_X288] = { .code = 0x288, .name = "Time Bomb" }, 44 [DIAG_STAT_X2C4] = { .code = 0x2c4, .name = "FTP Services" }, 45 [DIAG_STAT_X2FC] = { .code = 0x2fc, .name = "Guest Performance Data" }, 46 [DIAG_STAT_X304] = { .code = 0x304, .name = "Partition-Resource Service" }, 47 [DIAG_STAT_X308] = { .code = 0x308, .name = "List-Directed IPL" }, 48 [DIAG_STAT_X318] = { .code = 0x318, .name = "CP Name and Version Codes" }, 49 [DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" }, 50 }; 51 52 static int show_diag_stat(struct seq_file *m, void *v) 53 { 54 struct diag_stat *stat; 55 unsigned long n = (unsigned long) v - 1; 56 int cpu, prec, tmp; 57 58 get_online_cpus(); 59 if (n == 0) { 60 seq_puts(m, " "); 61 62 for_each_online_cpu(cpu) { 63 prec = 10; 64 for (tmp = 10; cpu >= tmp; tmp *= 10) 65 prec--; 66 seq_printf(m, "%*s%d", prec, "CPU", cpu); 67 } 68 seq_putc(m, '\n'); 69 } else if (n <= NR_DIAG_STAT) { 70 seq_printf(m, "diag %03x:", diag_map[n-1].code); 71 for_each_online_cpu(cpu) { 72 stat = &per_cpu(diag_stat, cpu); 73 seq_printf(m, " %10u", stat->counter[n-1]); 74 } 75 seq_printf(m, " %s\n", diag_map[n-1].name); 76 } 77 put_online_cpus(); 78 return 0; 79 } 80 81 static void *show_diag_stat_start(struct seq_file *m, loff_t *pos) 82 { 83 return *pos <= nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL; 84 } 85 86 static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos) 87 { 88 ++*pos; 89 return show_diag_stat_start(m, pos); 90 } 91 92 static void show_diag_stat_stop(struct seq_file *m, void *v) 93 { 94 } 95 96 static const struct seq_operations show_diag_stat_sops = { 97 .start = show_diag_stat_start, 98 .next = show_diag_stat_next, 99 .stop = show_diag_stat_stop, 100 .show = show_diag_stat, 101 }; 102 103 static int show_diag_stat_open(struct inode *inode, struct file *file) 104 { 105 return seq_open(file, &show_diag_stat_sops); 106 } 107 108 static const struct file_operations show_diag_stat_fops = { 109 .open = show_diag_stat_open, 110 .read = seq_read, 111 .llseek = seq_lseek, 112 .release = seq_release, 113 }; 114 115 116 static int __init show_diag_stat_init(void) 117 { 118 debugfs_create_file("diag_stat", 0400, NULL, NULL, 119 &show_diag_stat_fops); 120 return 0; 121 } 122 123 device_initcall(show_diag_stat_init); 124 125 void diag_stat_inc(enum diag_stat_enum nr) 126 { 127 this_cpu_inc(diag_stat.counter[nr]); 128 trace_s390_diagnose(diag_map[nr].code); 129 } 130 EXPORT_SYMBOL(diag_stat_inc); 131 132 void diag_stat_inc_norecursion(enum diag_stat_enum nr) 133 { 134 this_cpu_inc(diag_stat.counter[nr]); 135 trace_s390_diagnose_norecursion(diag_map[nr].code); 136 } 137 EXPORT_SYMBOL(diag_stat_inc_norecursion); 138 139 /* 140 * Diagnose 14: Input spool file manipulation 141 */ 142 static inline int __diag14(unsigned long rx, unsigned long ry1, 143 unsigned long subcode) 144 { 145 register unsigned long _ry1 asm("2") = ry1; 146 register unsigned long _ry2 asm("3") = subcode; 147 int rc = 0; 148 149 asm volatile( 150 " sam31\n" 151 " diag %2,2,0x14\n" 152 " sam64\n" 153 " ipm %0\n" 154 " srl %0,28\n" 155 : "=d" (rc), "+d" (_ry2) 156 : "d" (rx), "d" (_ry1) 157 : "cc"); 158 159 return rc; 160 } 161 162 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode) 163 { 164 diag_stat_inc(DIAG_STAT_X014); 165 return __diag14(rx, ry1, subcode); 166 } 167 EXPORT_SYMBOL(diag14); 168 169 static inline int __diag204(unsigned long *subcode, unsigned long size, void *addr) 170 { 171 register unsigned long _subcode asm("0") = *subcode; 172 register unsigned long _size asm("1") = size; 173 174 asm volatile( 175 " diag %2,%0,0x204\n" 176 "0: nopr %%r7\n" 177 EX_TABLE(0b,0b) 178 : "+d" (_subcode), "+d" (_size) : "d" (addr) : "memory"); 179 *subcode = _subcode; 180 return _size; 181 } 182 183 int diag204(unsigned long subcode, unsigned long size, void *addr) 184 { 185 diag_stat_inc(DIAG_STAT_X204); 186 size = __diag204(&subcode, size, addr); 187 if (subcode) 188 return -1; 189 return size; 190 } 191 EXPORT_SYMBOL(diag204); 192 193 /* 194 * Diagnose 210: Get information about a virtual device 195 */ 196 int diag210(struct diag210 *addr) 197 { 198 /* 199 * diag 210 needs its data below the 2GB border, so we 200 * use a static data area to be sure 201 */ 202 static struct diag210 diag210_tmp; 203 static DEFINE_SPINLOCK(diag210_lock); 204 unsigned long flags; 205 int ccode; 206 207 spin_lock_irqsave(&diag210_lock, flags); 208 diag210_tmp = *addr; 209 210 diag_stat_inc(DIAG_STAT_X210); 211 asm volatile( 212 " lhi %0,-1\n" 213 " sam31\n" 214 " diag %1,0,0x210\n" 215 "0: ipm %0\n" 216 " srl %0,28\n" 217 "1: sam64\n" 218 EX_TABLE(0b, 1b) 219 : "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory"); 220 221 *addr = diag210_tmp; 222 spin_unlock_irqrestore(&diag210_lock, flags); 223 224 return ccode; 225 } 226 EXPORT_SYMBOL(diag210); 227 228 int diag224(void *ptr) 229 { 230 int rc = -EOPNOTSUPP; 231 232 diag_stat_inc(DIAG_STAT_X224); 233 asm volatile( 234 " diag %1,%2,0x224\n" 235 "0: lhi %0,0x0\n" 236 "1:\n" 237 EX_TABLE(0b,1b) 238 : "+d" (rc) :"d" (0), "d" (ptr) : "memory"); 239 return rc; 240 } 241 EXPORT_SYMBOL(diag224); 242 243 /* 244 * Diagnose 26C: Access Certain System Information 245 */ 246 static inline int __diag26c(void *req, void *resp, enum diag26c_sc subcode) 247 { 248 register unsigned long _req asm("2") = (addr_t) req; 249 register unsigned long _resp asm("3") = (addr_t) resp; 250 register unsigned long _subcode asm("4") = subcode; 251 register unsigned long _rc asm("5") = -EOPNOTSUPP; 252 253 asm volatile( 254 " sam31\n" 255 " diag %[rx],%[ry],0x26c\n" 256 "0: sam64\n" 257 EX_TABLE(0b,0b) 258 : "+d" (_rc) 259 : [rx] "d" (_req), "d" (_resp), [ry] "d" (_subcode) 260 : "cc", "memory"); 261 return _rc; 262 } 263 264 int diag26c(void *req, void *resp, enum diag26c_sc subcode) 265 { 266 diag_stat_inc(DIAG_STAT_X26C); 267 return __diag26c(req, resp, subcode); 268 } 269 EXPORT_SYMBOL(diag26c); 270