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 <asm/asm.h> 20 #include "../entry.h" 21 22 struct diag_stat { 23 unsigned int counter[NR_DIAG_STAT]; 24 }; 25 26 static DEFINE_PER_CPU(struct diag_stat, diag_stat); 27 28 struct diag_desc { 29 int code; 30 char *name; 31 }; 32 33 static const struct diag_desc diag_map[NR_DIAG_STAT] = { 34 [DIAG_STAT_X008] = { .code = 0x008, .name = "Console Function" }, 35 [DIAG_STAT_X00C] = { .code = 0x00c, .name = "Pseudo Timer" }, 36 [DIAG_STAT_X010] = { .code = 0x010, .name = "Release Pages" }, 37 [DIAG_STAT_X014] = { .code = 0x014, .name = "Spool File Services" }, 38 [DIAG_STAT_X044] = { .code = 0x044, .name = "Voluntary Timeslice End" }, 39 [DIAG_STAT_X064] = { .code = 0x064, .name = "NSS Manipulation" }, 40 [DIAG_STAT_X08C] = { .code = 0x08c, .name = "Access 3270 Display Device Information" }, 41 [DIAG_STAT_X09C] = { .code = 0x09c, .name = "Relinquish Timeslice" }, 42 [DIAG_STAT_X0DC] = { .code = 0x0dc, .name = "Appldata Control" }, 43 [DIAG_STAT_X204] = { .code = 0x204, .name = "Logical-CPU Utilization" }, 44 [DIAG_STAT_X210] = { .code = 0x210, .name = "Device Information" }, 45 [DIAG_STAT_X224] = { .code = 0x224, .name = "EBCDIC-Name Table" }, 46 [DIAG_STAT_X250] = { .code = 0x250, .name = "Block I/O" }, 47 [DIAG_STAT_X258] = { .code = 0x258, .name = "Page-Reference Services" }, 48 [DIAG_STAT_X26C] = { .code = 0x26c, .name = "Certain System Information" }, 49 [DIAG_STAT_X288] = { .code = 0x288, .name = "Time Bomb" }, 50 [DIAG_STAT_X2C4] = { .code = 0x2c4, .name = "FTP Services" }, 51 [DIAG_STAT_X2FC] = { .code = 0x2fc, .name = "Guest Performance Data" }, 52 [DIAG_STAT_X304] = { .code = 0x304, .name = "Partition-Resource Service" }, 53 [DIAG_STAT_X308] = { .code = 0x308, .name = "List-Directed IPL" }, 54 [DIAG_STAT_X310] = { .code = 0x310, .name = "Memory Topology Information" }, 55 [DIAG_STAT_X318] = { .code = 0x318, .name = "CP Name and Version Codes" }, 56 [DIAG_STAT_X320] = { .code = 0x320, .name = "Certificate Store" }, 57 [DIAG_STAT_X324] = { .code = 0x324, .name = "Power Information Block" }, 58 [DIAG_STAT_X49C] = { .code = 0x49c, .name = "Warning-Track Interruption" }, 59 [DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" }, 60 }; 61 62 struct diag_ops __amode31_ref diag_amode31_ops = { 63 .diag210 = _diag210_amode31, 64 .diag26c = _diag26c_amode31, 65 .diag14 = _diag14_amode31, 66 .diag0c = _diag0c_amode31, 67 .diag8c = _diag8c_amode31, 68 .diag308_reset = _diag308_reset_amode31 69 }; 70 71 static struct diag210 _diag210_tmp_amode31 __section(".amode31.data"); 72 struct diag210 __amode31_ref *__diag210_tmp_amode31 = &_diag210_tmp_amode31; 73 74 static struct diag8c _diag8c_tmp_amode31 __section(".amode31.data"); 75 static struct diag8c __amode31_ref *__diag8c_tmp_amode31 = &_diag8c_tmp_amode31; 76 77 static int show_diag_stat(struct seq_file *m, void *v) 78 { 79 struct diag_stat *stat; 80 unsigned long n = (unsigned long) v - 1; 81 int cpu, prec, tmp; 82 83 cpus_read_lock(); 84 if (n == 0) { 85 seq_puts(m, " "); 86 87 for_each_online_cpu(cpu) { 88 prec = 10; 89 for (tmp = 10; cpu >= tmp; tmp *= 10) 90 prec--; 91 seq_printf(m, "%*s%d", prec, "CPU", cpu); 92 } 93 seq_putc(m, '\n'); 94 } else if (n <= NR_DIAG_STAT) { 95 seq_printf(m, "diag %03x:", diag_map[n-1].code); 96 for_each_online_cpu(cpu) { 97 stat = &per_cpu(diag_stat, cpu); 98 seq_printf(m, " %10u", stat->counter[n-1]); 99 } 100 seq_printf(m, " %s\n", diag_map[n-1].name); 101 } 102 cpus_read_unlock(); 103 return 0; 104 } 105 106 static void *show_diag_stat_start(struct seq_file *m, loff_t *pos) 107 { 108 return *pos <= NR_DIAG_STAT ? (void *)((unsigned long) *pos + 1) : NULL; 109 } 110 111 static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos) 112 { 113 ++*pos; 114 return show_diag_stat_start(m, pos); 115 } 116 117 static void show_diag_stat_stop(struct seq_file *m, void *v) 118 { 119 } 120 121 static const struct seq_operations show_diag_stat_sops = { 122 .start = show_diag_stat_start, 123 .next = show_diag_stat_next, 124 .stop = show_diag_stat_stop, 125 .show = show_diag_stat, 126 }; 127 128 DEFINE_SEQ_ATTRIBUTE(show_diag_stat); 129 130 static int __init show_diag_stat_init(void) 131 { 132 debugfs_create_file("diag_stat", 0400, NULL, NULL, 133 &show_diag_stat_fops); 134 return 0; 135 } 136 137 device_initcall(show_diag_stat_init); 138 139 void diag_stat_inc(enum diag_stat_enum nr) 140 { 141 this_cpu_inc(diag_stat.counter[nr]); 142 trace_s390_diagnose(diag_map[nr].code); 143 } 144 EXPORT_SYMBOL(diag_stat_inc); 145 146 void notrace diag_stat_inc_norecursion(enum diag_stat_enum nr) 147 { 148 this_cpu_inc(diag_stat.counter[nr]); 149 trace_s390_diagnose_norecursion(diag_map[nr].code); 150 } 151 EXPORT_SYMBOL(diag_stat_inc_norecursion); 152 153 /* 154 * Diagnose 0c: Pseudo Timer 155 */ 156 void diag0c(struct hypfs_diag0c_entry *data) 157 { 158 diag_stat_inc(DIAG_STAT_X00C); 159 diag_amode31_ops.diag0c(virt_to_phys(data)); 160 } 161 162 /* 163 * Diagnose 14: Input spool file manipulation 164 * 165 * The subcode parameter determines the type of the first parameter rx. 166 * Currently used are the following 3 subcommands: 167 * 0x0: Read the Next Spool File Buffer (Data Record) 168 * 0x28: Position a Spool File to the Designated Record 169 * 0xfff: Retrieve Next File Descriptor 170 * 171 * For subcommands 0x0 and 0xfff, the value of the first parameter is 172 * a virtual address of a memory buffer and needs virtual to physical 173 * address translation. For other subcommands the rx parameter is not 174 * a virtual address. 175 */ 176 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode) 177 { 178 diag_stat_inc(DIAG_STAT_X014); 179 switch (subcode) { 180 case 0x0: 181 case 0xfff: 182 rx = virt_to_phys((void *)rx); 183 break; 184 default: 185 /* Do nothing */ 186 break; 187 } 188 return diag_amode31_ops.diag14(rx, ry1, subcode); 189 } 190 EXPORT_SYMBOL(diag14); 191 192 #define DIAG204_BUSY_RC 8 193 194 static inline int __diag204(unsigned long *subcode, unsigned long size, void *addr) 195 { 196 union register_pair rp = { .even = *subcode, .odd = size }; 197 198 asm volatile( 199 " diag %[addr],%[rp],0x204\n" 200 "0: nopr %%r7\n" 201 EX_TABLE(0b,0b) 202 : [rp] "+&d" (rp.pair) : [addr] "d" (addr) : "memory"); 203 *subcode = rp.even; 204 return rp.odd; 205 } 206 207 /** 208 * diag204() - Issue diagnose 204 call. 209 * @subcode: Subcode of diagnose 204 to be executed. 210 * @size: Size of area in pages which @area points to, if given. 211 * @addr: Vmalloc'ed memory area where the result is written to. 212 * 213 * Execute diagnose 204 with the given subcode and write the result to the 214 * memory area specified with @addr. For subcodes which do not write a 215 * result to memory both @size and @addr must be zero. If @addr is 216 * specified it must be page aligned and must have been allocated with 217 * vmalloc(). Conversion to real / physical addresses will be handled by 218 * this function if required. 219 */ 220 int diag204(unsigned long subcode, unsigned long size, void *addr) 221 { 222 if (addr) { 223 if (WARN_ON_ONCE(!is_vmalloc_addr(addr))) 224 return -EINVAL; 225 if (WARN_ON_ONCE(!IS_ALIGNED((unsigned long)addr, PAGE_SIZE))) 226 return -EINVAL; 227 } 228 if ((subcode & DIAG204_SUBCODE_MASK) == DIAG204_SUBC_STIB4) 229 addr = (void *)pfn_to_phys(vmalloc_to_pfn(addr)); 230 diag_stat_inc(DIAG_STAT_X204); 231 size = __diag204(&subcode, size, addr); 232 if (subcode == DIAG204_BUSY_RC) 233 return -EBUSY; 234 else if (subcode) 235 return -EOPNOTSUPP; 236 return size; 237 } 238 EXPORT_SYMBOL(diag204); 239 240 /* 241 * Diagnose 210: Get information about a virtual device 242 */ 243 int diag210(struct diag210 *addr) 244 { 245 static DEFINE_SPINLOCK(diag210_lock); 246 unsigned long flags; 247 int ccode; 248 249 spin_lock_irqsave(&diag210_lock, flags); 250 *__diag210_tmp_amode31 = *addr; 251 252 diag_stat_inc(DIAG_STAT_X210); 253 ccode = diag_amode31_ops.diag210(__diag210_tmp_amode31); 254 255 *addr = *__diag210_tmp_amode31; 256 spin_unlock_irqrestore(&diag210_lock, flags); 257 258 return ccode; 259 } 260 EXPORT_SYMBOL(diag210); 261 262 /* 263 * Diagnose 8C: Access 3270 Display Device Information 264 */ 265 int diag8c(struct diag8c *addr, struct ccw_dev_id *devno) 266 { 267 static DEFINE_SPINLOCK(diag8c_lock); 268 unsigned long flags; 269 int ccode; 270 271 spin_lock_irqsave(&diag8c_lock, flags); 272 273 diag_stat_inc(DIAG_STAT_X08C); 274 ccode = diag_amode31_ops.diag8c(__diag8c_tmp_amode31, devno, sizeof(*addr)); 275 276 *addr = *__diag8c_tmp_amode31; 277 spin_unlock_irqrestore(&diag8c_lock, flags); 278 279 return ccode; 280 } 281 EXPORT_SYMBOL(diag8c); 282 283 int diag224(void *ptr) 284 { 285 unsigned long addr = __pa(ptr); 286 int rc = -EOPNOTSUPP; 287 288 diag_stat_inc(DIAG_STAT_X224); 289 asm volatile("\n" 290 " diag %[type],%[addr],0x224\n" 291 "0: lhi %[rc],0\n" 292 "1:\n" 293 EX_TABLE(0b,1b) 294 : [rc] "+d" (rc) 295 , "=m" (*(struct { char buf[PAGE_SIZE]; } *)ptr) 296 : [type] "d" (0), [addr] "d" (addr)); 297 return rc; 298 } 299 EXPORT_SYMBOL(diag224); 300 301 /* 302 * Diagnose 26C: Access Certain System Information 303 */ 304 int diag26c(void *req, void *resp, enum diag26c_sc subcode) 305 { 306 diag_stat_inc(DIAG_STAT_X26C); 307 return diag_amode31_ops.diag26c(virt_to_phys(req), virt_to_phys(resp), subcode); 308 } 309 EXPORT_SYMBOL(diag26c); 310 311 int diag49c(unsigned long subcode) 312 { 313 int cc; 314 315 diag_stat_inc(DIAG_STAT_X49C); 316 asm volatile( 317 " diag %[subcode],0,0x49c\n" 318 CC_IPM(cc) 319 : CC_OUT(cc, cc) 320 : [subcode] "d" (subcode) 321 : CC_CLOBBER); 322 return CC_TRANSFORM(cc); 323 } 324 EXPORT_SYMBOL(diag49c); 325