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 <linux/vmalloc.h> 15 #include <asm/asm-extable.h> 16 #include <asm/diag.h> 17 #include <asm/trace/diag.h> 18 #include <asm/sections.h> 19 #include "entry.h" 20 21 struct diag_stat { 22 unsigned int counter[NR_DIAG_STAT]; 23 }; 24 25 static DEFINE_PER_CPU(struct diag_stat, diag_stat); 26 27 struct diag_desc { 28 int code; 29 char *name; 30 }; 31 32 static const struct diag_desc diag_map[NR_DIAG_STAT] = { 33 [DIAG_STAT_X008] = { .code = 0x008, .name = "Console Function" }, 34 [DIAG_STAT_X00C] = { .code = 0x00c, .name = "Pseudo Timer" }, 35 [DIAG_STAT_X010] = { .code = 0x010, .name = "Release Pages" }, 36 [DIAG_STAT_X014] = { .code = 0x014, .name = "Spool File Services" }, 37 [DIAG_STAT_X044] = { .code = 0x044, .name = "Voluntary Timeslice End" }, 38 [DIAG_STAT_X064] = { .code = 0x064, .name = "NSS Manipulation" }, 39 [DIAG_STAT_X08C] = { .code = 0x08c, .name = "Access 3270 Display Device Information" }, 40 [DIAG_STAT_X09C] = { .code = 0x09c, .name = "Relinquish Timeslice" }, 41 [DIAG_STAT_X0DC] = { .code = 0x0dc, .name = "Appldata Control" }, 42 [DIAG_STAT_X204] = { .code = 0x204, .name = "Logical-CPU Utilization" }, 43 [DIAG_STAT_X210] = { .code = 0x210, .name = "Device Information" }, 44 [DIAG_STAT_X224] = { .code = 0x224, .name = "EBCDIC-Name Table" }, 45 [DIAG_STAT_X250] = { .code = 0x250, .name = "Block I/O" }, 46 [DIAG_STAT_X258] = { .code = 0x258, .name = "Page-Reference Services" }, 47 [DIAG_STAT_X26C] = { .code = 0x26c, .name = "Certain System Information" }, 48 [DIAG_STAT_X288] = { .code = 0x288, .name = "Time Bomb" }, 49 [DIAG_STAT_X2C4] = { .code = 0x2c4, .name = "FTP Services" }, 50 [DIAG_STAT_X2FC] = { .code = 0x2fc, .name = "Guest Performance Data" }, 51 [DIAG_STAT_X304] = { .code = 0x304, .name = "Partition-Resource Service" }, 52 [DIAG_STAT_X308] = { .code = 0x308, .name = "List-Directed IPL" }, 53 [DIAG_STAT_X318] = { .code = 0x318, .name = "CP Name and Version Codes" }, 54 [DIAG_STAT_X320] = { .code = 0x320, .name = "Certificate Store" }, 55 [DIAG_STAT_X49C] = { .code = 0x49c, .name = "Warning-Track Interruption" }, 56 [DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" }, 57 }; 58 59 struct diag_ops __amode31_ref diag_amode31_ops = { 60 .diag210 = _diag210_amode31, 61 .diag26c = _diag26c_amode31, 62 .diag14 = _diag14_amode31, 63 .diag0c = _diag0c_amode31, 64 .diag8c = _diag8c_amode31, 65 .diag308_reset = _diag308_reset_amode31 66 }; 67 68 static struct diag210 _diag210_tmp_amode31 __section(".amode31.data"); 69 struct diag210 __amode31_ref *__diag210_tmp_amode31 = &_diag210_tmp_amode31; 70 71 static struct diag8c _diag8c_tmp_amode31 __section(".amode31.data"); 72 static struct diag8c __amode31_ref *__diag8c_tmp_amode31 = &_diag8c_tmp_amode31; 73 74 static int show_diag_stat(struct seq_file *m, void *v) 75 { 76 struct diag_stat *stat; 77 unsigned long n = (unsigned long) v - 1; 78 int cpu, prec, tmp; 79 80 cpus_read_lock(); 81 if (n == 0) { 82 seq_puts(m, " "); 83 84 for_each_online_cpu(cpu) { 85 prec = 10; 86 for (tmp = 10; cpu >= tmp; tmp *= 10) 87 prec--; 88 seq_printf(m, "%*s%d", prec, "CPU", cpu); 89 } 90 seq_putc(m, '\n'); 91 } else if (n <= NR_DIAG_STAT) { 92 seq_printf(m, "diag %03x:", diag_map[n-1].code); 93 for_each_online_cpu(cpu) { 94 stat = &per_cpu(diag_stat, cpu); 95 seq_printf(m, " %10u", stat->counter[n-1]); 96 } 97 seq_printf(m, " %s\n", diag_map[n-1].name); 98 } 99 cpus_read_unlock(); 100 return 0; 101 } 102 103 static void *show_diag_stat_start(struct seq_file *m, loff_t *pos) 104 { 105 return *pos <= NR_DIAG_STAT ? (void *)((unsigned long) *pos + 1) : NULL; 106 } 107 108 static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos) 109 { 110 ++*pos; 111 return show_diag_stat_start(m, pos); 112 } 113 114 static void show_diag_stat_stop(struct seq_file *m, void *v) 115 { 116 } 117 118 static const struct seq_operations show_diag_stat_sops = { 119 .start = show_diag_stat_start, 120 .next = show_diag_stat_next, 121 .stop = show_diag_stat_stop, 122 .show = show_diag_stat, 123 }; 124 125 DEFINE_SEQ_ATTRIBUTE(show_diag_stat); 126 127 static int __init show_diag_stat_init(void) 128 { 129 debugfs_create_file("diag_stat", 0400, NULL, NULL, 130 &show_diag_stat_fops); 131 return 0; 132 } 133 134 device_initcall(show_diag_stat_init); 135 136 void diag_stat_inc(enum diag_stat_enum nr) 137 { 138 this_cpu_inc(diag_stat.counter[nr]); 139 trace_s390_diagnose(diag_map[nr].code); 140 } 141 EXPORT_SYMBOL(diag_stat_inc); 142 143 void notrace diag_stat_inc_norecursion(enum diag_stat_enum nr) 144 { 145 this_cpu_inc(diag_stat.counter[nr]); 146 trace_s390_diagnose_norecursion(diag_map[nr].code); 147 } 148 EXPORT_SYMBOL(diag_stat_inc_norecursion); 149 150 /* 151 * Diagnose 0c: Pseudo Timer 152 */ 153 void diag0c(struct hypfs_diag0c_entry *data) 154 { 155 diag_stat_inc(DIAG_STAT_X00C); 156 diag_amode31_ops.diag0c(virt_to_phys(data)); 157 } 158 159 /* 160 * Diagnose 14: Input spool file manipulation 161 * 162 * The subcode parameter determines the type of the first parameter rx. 163 * Currently used are the following 3 subcommands: 164 * 0x0: Read the Next Spool File Buffer (Data Record) 165 * 0x28: Position a Spool File to the Designated Record 166 * 0xfff: Retrieve Next File Descriptor 167 * 168 * For subcommands 0x0 and 0xfff, the value of the first parameter is 169 * a virtual address of a memory buffer and needs virtual to physical 170 * address translation. For other subcommands the rx parameter is not 171 * a virtual address. 172 */ 173 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode) 174 { 175 diag_stat_inc(DIAG_STAT_X014); 176 switch (subcode) { 177 case 0x0: 178 case 0xfff: 179 rx = virt_to_phys((void *)rx); 180 break; 181 default: 182 /* Do nothing */ 183 break; 184 } 185 return diag_amode31_ops.diag14(rx, ry1, subcode); 186 } 187 EXPORT_SYMBOL(diag14); 188 189 #define DIAG204_BUSY_RC 8 190 191 static inline int __diag204(unsigned long *subcode, unsigned long size, void *addr) 192 { 193 union register_pair rp = { .even = *subcode, .odd = size }; 194 195 asm volatile( 196 " diag %[addr],%[rp],0x204\n" 197 "0: nopr %%r7\n" 198 EX_TABLE(0b,0b) 199 : [rp] "+&d" (rp.pair) : [addr] "d" (addr) : "memory"); 200 *subcode = rp.even; 201 return rp.odd; 202 } 203 204 /** 205 * diag204() - Issue diagnose 204 call. 206 * @subcode: Subcode of diagnose 204 to be executed. 207 * @size: Size of area in pages which @area points to, if given. 208 * @addr: Vmalloc'ed memory area where the result is written to. 209 * 210 * Execute diagnose 204 with the given subcode and write the result to the 211 * memory area specified with @addr. For subcodes which do not write a 212 * result to memory both @size and @addr must be zero. If @addr is 213 * specified it must be page aligned and must have been allocated with 214 * vmalloc(). Conversion to real / physical addresses will be handled by 215 * this function if required. 216 */ 217 int diag204(unsigned long subcode, unsigned long size, void *addr) 218 { 219 if (addr) { 220 if (WARN_ON_ONCE(!is_vmalloc_addr(addr))) 221 return -EINVAL; 222 if (WARN_ON_ONCE(!IS_ALIGNED((unsigned long)addr, PAGE_SIZE))) 223 return -EINVAL; 224 } 225 if ((subcode & DIAG204_SUBCODE_MASK) == DIAG204_SUBC_STIB4) 226 addr = (void *)pfn_to_phys(vmalloc_to_pfn(addr)); 227 diag_stat_inc(DIAG_STAT_X204); 228 size = __diag204(&subcode, size, addr); 229 if (subcode == DIAG204_BUSY_RC) 230 return -EBUSY; 231 else if (subcode) 232 return -EOPNOTSUPP; 233 return size; 234 } 235 EXPORT_SYMBOL(diag204); 236 237 /* 238 * Diagnose 210: Get information about a virtual device 239 */ 240 int diag210(struct diag210 *addr) 241 { 242 static DEFINE_SPINLOCK(diag210_lock); 243 unsigned long flags; 244 int ccode; 245 246 spin_lock_irqsave(&diag210_lock, flags); 247 *__diag210_tmp_amode31 = *addr; 248 249 diag_stat_inc(DIAG_STAT_X210); 250 ccode = diag_amode31_ops.diag210(__diag210_tmp_amode31); 251 252 *addr = *__diag210_tmp_amode31; 253 spin_unlock_irqrestore(&diag210_lock, flags); 254 255 return ccode; 256 } 257 EXPORT_SYMBOL(diag210); 258 259 /* 260 * Diagnose 8C: Access 3270 Display Device Information 261 */ 262 int diag8c(struct diag8c *addr, struct ccw_dev_id *devno) 263 { 264 static DEFINE_SPINLOCK(diag8c_lock); 265 unsigned long flags; 266 int ccode; 267 268 spin_lock_irqsave(&diag8c_lock, flags); 269 270 diag_stat_inc(DIAG_STAT_X08C); 271 ccode = diag_amode31_ops.diag8c(__diag8c_tmp_amode31, devno, sizeof(*addr)); 272 273 *addr = *__diag8c_tmp_amode31; 274 spin_unlock_irqrestore(&diag8c_lock, flags); 275 276 return ccode; 277 } 278 EXPORT_SYMBOL(diag8c); 279 280 int diag224(void *ptr) 281 { 282 unsigned long addr = __pa(ptr); 283 int rc = -EOPNOTSUPP; 284 285 diag_stat_inc(DIAG_STAT_X224); 286 asm volatile("\n" 287 " diag %[type],%[addr],0x224\n" 288 "0: lhi %[rc],0\n" 289 "1:\n" 290 EX_TABLE(0b,1b) 291 : [rc] "+d" (rc) 292 , "=m" (*(struct { char buf[PAGE_SIZE]; } *)ptr) 293 : [type] "d" (0), [addr] "d" (addr)); 294 return rc; 295 } 296 EXPORT_SYMBOL(diag224); 297 298 /* 299 * Diagnose 26C: Access Certain System Information 300 */ 301 int diag26c(void *req, void *resp, enum diag26c_sc subcode) 302 { 303 diag_stat_inc(DIAG_STAT_X26C); 304 return diag_amode31_ops.diag26c(virt_to_phys(req), virt_to_phys(resp), subcode); 305 } 306 EXPORT_SYMBOL(diag26c); 307 308 int diag49c(unsigned long subcode) 309 { 310 int rc; 311 312 diag_stat_inc(DIAG_STAT_X49C); 313 asm volatile( 314 " diag %[subcode],0,0x49c\n" 315 " ipm %[rc]\n" 316 " srl %[rc],28\n" 317 : [rc] "=d" (rc) 318 : [subcode] "d" (subcode) 319 : "cc"); 320 return rc; 321 } 322 EXPORT_SYMBOL(diag49c); 323