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_X500] = { .code = 0x500, .name = "Virtio Service" }, 49 }; 50 51 static int show_diag_stat(struct seq_file *m, void *v) 52 { 53 struct diag_stat *stat; 54 unsigned long n = (unsigned long) v - 1; 55 int cpu, prec, tmp; 56 57 get_online_cpus(); 58 if (n == 0) { 59 seq_puts(m, " "); 60 61 for_each_online_cpu(cpu) { 62 prec = 10; 63 for (tmp = 10; cpu >= tmp; tmp *= 10) 64 prec--; 65 seq_printf(m, "%*s%d", prec, "CPU", cpu); 66 } 67 seq_putc(m, '\n'); 68 } else if (n <= NR_DIAG_STAT) { 69 seq_printf(m, "diag %03x:", diag_map[n-1].code); 70 for_each_online_cpu(cpu) { 71 stat = &per_cpu(diag_stat, cpu); 72 seq_printf(m, " %10u", stat->counter[n-1]); 73 } 74 seq_printf(m, " %s\n", diag_map[n-1].name); 75 } 76 put_online_cpus(); 77 return 0; 78 } 79 80 static void *show_diag_stat_start(struct seq_file *m, loff_t *pos) 81 { 82 return *pos <= nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL; 83 } 84 85 static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos) 86 { 87 ++*pos; 88 return show_diag_stat_start(m, pos); 89 } 90 91 static void show_diag_stat_stop(struct seq_file *m, void *v) 92 { 93 } 94 95 static const struct seq_operations show_diag_stat_sops = { 96 .start = show_diag_stat_start, 97 .next = show_diag_stat_next, 98 .stop = show_diag_stat_stop, 99 .show = show_diag_stat, 100 }; 101 102 static int show_diag_stat_open(struct inode *inode, struct file *file) 103 { 104 return seq_open(file, &show_diag_stat_sops); 105 } 106 107 static const struct file_operations show_diag_stat_fops = { 108 .open = show_diag_stat_open, 109 .read = seq_read, 110 .llseek = seq_lseek, 111 .release = seq_release, 112 }; 113 114 115 static int __init show_diag_stat_init(void) 116 { 117 debugfs_create_file("diag_stat", 0400, NULL, NULL, 118 &show_diag_stat_fops); 119 return 0; 120 } 121 122 device_initcall(show_diag_stat_init); 123 124 void diag_stat_inc(enum diag_stat_enum nr) 125 { 126 this_cpu_inc(diag_stat.counter[nr]); 127 trace_s390_diagnose(diag_map[nr].code); 128 } 129 EXPORT_SYMBOL(diag_stat_inc); 130 131 void diag_stat_inc_norecursion(enum diag_stat_enum nr) 132 { 133 this_cpu_inc(diag_stat.counter[nr]); 134 trace_s390_diagnose_norecursion(diag_map[nr].code); 135 } 136 EXPORT_SYMBOL(diag_stat_inc_norecursion); 137 138 /* 139 * Diagnose 14: Input spool file manipulation 140 */ 141 static inline int __diag14(unsigned long rx, unsigned long ry1, 142 unsigned long subcode) 143 { 144 register unsigned long _ry1 asm("2") = ry1; 145 register unsigned long _ry2 asm("3") = subcode; 146 int rc = 0; 147 148 asm volatile( 149 " sam31\n" 150 " diag %2,2,0x14\n" 151 " sam64\n" 152 " ipm %0\n" 153 " srl %0,28\n" 154 : "=d" (rc), "+d" (_ry2) 155 : "d" (rx), "d" (_ry1) 156 : "cc"); 157 158 return rc; 159 } 160 161 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode) 162 { 163 diag_stat_inc(DIAG_STAT_X014); 164 return __diag14(rx, ry1, subcode); 165 } 166 EXPORT_SYMBOL(diag14); 167 168 static inline int __diag204(unsigned long *subcode, unsigned long size, void *addr) 169 { 170 register unsigned long _subcode asm("0") = *subcode; 171 register unsigned long _size asm("1") = size; 172 173 asm volatile( 174 " diag %2,%0,0x204\n" 175 "0: nopr %%r7\n" 176 EX_TABLE(0b,0b) 177 : "+d" (_subcode), "+d" (_size) : "d" (addr) : "memory"); 178 *subcode = _subcode; 179 return _size; 180 } 181 182 int diag204(unsigned long subcode, unsigned long size, void *addr) 183 { 184 diag_stat_inc(DIAG_STAT_X204); 185 size = __diag204(&subcode, size, addr); 186 if (subcode) 187 return -1; 188 return size; 189 } 190 EXPORT_SYMBOL(diag204); 191 192 /* 193 * Diagnose 210: Get information about a virtual device 194 */ 195 int diag210(struct diag210 *addr) 196 { 197 /* 198 * diag 210 needs its data below the 2GB border, so we 199 * use a static data area to be sure 200 */ 201 static struct diag210 diag210_tmp; 202 static DEFINE_SPINLOCK(diag210_lock); 203 unsigned long flags; 204 int ccode; 205 206 spin_lock_irqsave(&diag210_lock, flags); 207 diag210_tmp = *addr; 208 209 diag_stat_inc(DIAG_STAT_X210); 210 asm volatile( 211 " lhi %0,-1\n" 212 " sam31\n" 213 " diag %1,0,0x210\n" 214 "0: ipm %0\n" 215 " srl %0,28\n" 216 "1: sam64\n" 217 EX_TABLE(0b, 1b) 218 : "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory"); 219 220 *addr = diag210_tmp; 221 spin_unlock_irqrestore(&diag210_lock, flags); 222 223 return ccode; 224 } 225 EXPORT_SYMBOL(diag210); 226 227 int diag224(void *ptr) 228 { 229 int rc = -EOPNOTSUPP; 230 231 diag_stat_inc(DIAG_STAT_X224); 232 asm volatile( 233 " diag %1,%2,0x224\n" 234 "0: lhi %0,0x0\n" 235 "1:\n" 236 EX_TABLE(0b,1b) 237 : "+d" (rc) :"d" (0), "d" (ptr) : "memory"); 238 return rc; 239 } 240 EXPORT_SYMBOL(diag224); 241 242 /* 243 * Diagnose 26C: Access Certain System Information 244 */ 245 static inline int __diag26c(void *req, void *resp, enum diag26c_sc subcode) 246 { 247 register unsigned long _req asm("2") = (addr_t) req; 248 register unsigned long _resp asm("3") = (addr_t) resp; 249 register unsigned long _subcode asm("4") = subcode; 250 register unsigned long _rc asm("5") = -EOPNOTSUPP; 251 252 asm volatile( 253 " sam31\n" 254 " diag %[rx],%[ry],0x26c\n" 255 "0: sam64\n" 256 EX_TABLE(0b,0b) 257 : "+d" (_rc) 258 : [rx] "d" (_req), "d" (_resp), [ry] "d" (_subcode) 259 : "cc", "memory"); 260 return _rc; 261 } 262 263 int diag26c(void *req, void *resp, enum diag26c_sc subcode) 264 { 265 diag_stat_inc(DIAG_STAT_X26C); 266 return __diag26c(req, resp, subcode); 267 } 268 EXPORT_SYMBOL(diag26c); 269