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_X318] = { .code = 0x318, .name = "CP Name and Version Codes" }, 55 [DIAG_STAT_X320] = { .code = 0x320, .name = "Certificate Store" }, 56 [DIAG_STAT_X49C] = { .code = 0x49c, .name = "Warning-Track Interruption" }, 57 [DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" }, 58 }; 59 60 struct diag_ops __amode31_ref diag_amode31_ops = { 61 .diag210 = _diag210_amode31, 62 .diag26c = _diag26c_amode31, 63 .diag14 = _diag14_amode31, 64 .diag0c = _diag0c_amode31, 65 .diag8c = _diag8c_amode31, 66 .diag308_reset = _diag308_reset_amode31 67 }; 68 69 static struct diag210 _diag210_tmp_amode31 __section(".amode31.data"); 70 struct diag210 __amode31_ref *__diag210_tmp_amode31 = &_diag210_tmp_amode31; 71 72 static struct diag8c _diag8c_tmp_amode31 __section(".amode31.data"); 73 static struct diag8c __amode31_ref *__diag8c_tmp_amode31 = &_diag8c_tmp_amode31; 74 75 static int show_diag_stat(struct seq_file *m, void *v) 76 { 77 struct diag_stat *stat; 78 unsigned long n = (unsigned long) v - 1; 79 int cpu, prec, tmp; 80 81 cpus_read_lock(); 82 if (n == 0) { 83 seq_puts(m, " "); 84 85 for_each_online_cpu(cpu) { 86 prec = 10; 87 for (tmp = 10; cpu >= tmp; tmp *= 10) 88 prec--; 89 seq_printf(m, "%*s%d", prec, "CPU", cpu); 90 } 91 seq_putc(m, '\n'); 92 } else if (n <= NR_DIAG_STAT) { 93 seq_printf(m, "diag %03x:", diag_map[n-1].code); 94 for_each_online_cpu(cpu) { 95 stat = &per_cpu(diag_stat, cpu); 96 seq_printf(m, " %10u", stat->counter[n-1]); 97 } 98 seq_printf(m, " %s\n", diag_map[n-1].name); 99 } 100 cpus_read_unlock(); 101 return 0; 102 } 103 104 static void *show_diag_stat_start(struct seq_file *m, loff_t *pos) 105 { 106 return *pos <= NR_DIAG_STAT ? (void *)((unsigned long) *pos + 1) : NULL; 107 } 108 109 static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos) 110 { 111 ++*pos; 112 return show_diag_stat_start(m, pos); 113 } 114 115 static void show_diag_stat_stop(struct seq_file *m, void *v) 116 { 117 } 118 119 static const struct seq_operations show_diag_stat_sops = { 120 .start = show_diag_stat_start, 121 .next = show_diag_stat_next, 122 .stop = show_diag_stat_stop, 123 .show = show_diag_stat, 124 }; 125 126 DEFINE_SEQ_ATTRIBUTE(show_diag_stat); 127 128 static int __init show_diag_stat_init(void) 129 { 130 debugfs_create_file("diag_stat", 0400, NULL, NULL, 131 &show_diag_stat_fops); 132 return 0; 133 } 134 135 device_initcall(show_diag_stat_init); 136 137 void diag_stat_inc(enum diag_stat_enum nr) 138 { 139 this_cpu_inc(diag_stat.counter[nr]); 140 trace_s390_diagnose(diag_map[nr].code); 141 } 142 EXPORT_SYMBOL(diag_stat_inc); 143 144 void notrace diag_stat_inc_norecursion(enum diag_stat_enum nr) 145 { 146 this_cpu_inc(diag_stat.counter[nr]); 147 trace_s390_diagnose_norecursion(diag_map[nr].code); 148 } 149 EXPORT_SYMBOL(diag_stat_inc_norecursion); 150 151 /* 152 * Diagnose 0c: Pseudo Timer 153 */ 154 void diag0c(struct hypfs_diag0c_entry *data) 155 { 156 diag_stat_inc(DIAG_STAT_X00C); 157 diag_amode31_ops.diag0c(virt_to_phys(data)); 158 } 159 160 /* 161 * Diagnose 14: Input spool file manipulation 162 * 163 * The subcode parameter determines the type of the first parameter rx. 164 * Currently used are the following 3 subcommands: 165 * 0x0: Read the Next Spool File Buffer (Data Record) 166 * 0x28: Position a Spool File to the Designated Record 167 * 0xfff: Retrieve Next File Descriptor 168 * 169 * For subcommands 0x0 and 0xfff, the value of the first parameter is 170 * a virtual address of a memory buffer and needs virtual to physical 171 * address translation. For other subcommands the rx parameter is not 172 * a virtual address. 173 */ 174 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode) 175 { 176 diag_stat_inc(DIAG_STAT_X014); 177 switch (subcode) { 178 case 0x0: 179 case 0xfff: 180 rx = virt_to_phys((void *)rx); 181 break; 182 default: 183 /* Do nothing */ 184 break; 185 } 186 return diag_amode31_ops.diag14(rx, ry1, subcode); 187 } 188 EXPORT_SYMBOL(diag14); 189 190 #define DIAG204_BUSY_RC 8 191 192 static inline int __diag204(unsigned long *subcode, unsigned long size, void *addr) 193 { 194 union register_pair rp = { .even = *subcode, .odd = size }; 195 196 asm volatile( 197 " diag %[addr],%[rp],0x204\n" 198 "0: nopr %%r7\n" 199 EX_TABLE(0b,0b) 200 : [rp] "+&d" (rp.pair) : [addr] "d" (addr) : "memory"); 201 *subcode = rp.even; 202 return rp.odd; 203 } 204 205 /** 206 * diag204() - Issue diagnose 204 call. 207 * @subcode: Subcode of diagnose 204 to be executed. 208 * @size: Size of area in pages which @area points to, if given. 209 * @addr: Vmalloc'ed memory area where the result is written to. 210 * 211 * Execute diagnose 204 with the given subcode and write the result to the 212 * memory area specified with @addr. For subcodes which do not write a 213 * result to memory both @size and @addr must be zero. If @addr is 214 * specified it must be page aligned and must have been allocated with 215 * vmalloc(). Conversion to real / physical addresses will be handled by 216 * this function if required. 217 */ 218 int diag204(unsigned long subcode, unsigned long size, void *addr) 219 { 220 if (addr) { 221 if (WARN_ON_ONCE(!is_vmalloc_addr(addr))) 222 return -EINVAL; 223 if (WARN_ON_ONCE(!IS_ALIGNED((unsigned long)addr, PAGE_SIZE))) 224 return -EINVAL; 225 } 226 if ((subcode & DIAG204_SUBCODE_MASK) == DIAG204_SUBC_STIB4) 227 addr = (void *)pfn_to_phys(vmalloc_to_pfn(addr)); 228 diag_stat_inc(DIAG_STAT_X204); 229 size = __diag204(&subcode, size, addr); 230 if (subcode == DIAG204_BUSY_RC) 231 return -EBUSY; 232 else if (subcode) 233 return -EOPNOTSUPP; 234 return size; 235 } 236 EXPORT_SYMBOL(diag204); 237 238 /* 239 * Diagnose 210: Get information about a virtual device 240 */ 241 int diag210(struct diag210 *addr) 242 { 243 static DEFINE_SPINLOCK(diag210_lock); 244 unsigned long flags; 245 int ccode; 246 247 spin_lock_irqsave(&diag210_lock, flags); 248 *__diag210_tmp_amode31 = *addr; 249 250 diag_stat_inc(DIAG_STAT_X210); 251 ccode = diag_amode31_ops.diag210(__diag210_tmp_amode31); 252 253 *addr = *__diag210_tmp_amode31; 254 spin_unlock_irqrestore(&diag210_lock, flags); 255 256 return ccode; 257 } 258 EXPORT_SYMBOL(diag210); 259 260 /* 261 * Diagnose 8C: Access 3270 Display Device Information 262 */ 263 int diag8c(struct diag8c *addr, struct ccw_dev_id *devno) 264 { 265 static DEFINE_SPINLOCK(diag8c_lock); 266 unsigned long flags; 267 int ccode; 268 269 spin_lock_irqsave(&diag8c_lock, flags); 270 271 diag_stat_inc(DIAG_STAT_X08C); 272 ccode = diag_amode31_ops.diag8c(__diag8c_tmp_amode31, devno, sizeof(*addr)); 273 274 *addr = *__diag8c_tmp_amode31; 275 spin_unlock_irqrestore(&diag8c_lock, flags); 276 277 return ccode; 278 } 279 EXPORT_SYMBOL(diag8c); 280 281 int diag224(void *ptr) 282 { 283 unsigned long addr = __pa(ptr); 284 int rc = -EOPNOTSUPP; 285 286 diag_stat_inc(DIAG_STAT_X224); 287 asm volatile("\n" 288 " diag %[type],%[addr],0x224\n" 289 "0: lhi %[rc],0\n" 290 "1:\n" 291 EX_TABLE(0b,1b) 292 : [rc] "+d" (rc) 293 , "=m" (*(struct { char buf[PAGE_SIZE]; } *)ptr) 294 : [type] "d" (0), [addr] "d" (addr)); 295 return rc; 296 } 297 EXPORT_SYMBOL(diag224); 298 299 /* 300 * Diagnose 26C: Access Certain System Information 301 */ 302 int diag26c(void *req, void *resp, enum diag26c_sc subcode) 303 { 304 diag_stat_inc(DIAG_STAT_X26C); 305 return diag_amode31_ops.diag26c(virt_to_phys(req), virt_to_phys(resp), subcode); 306 } 307 EXPORT_SYMBOL(diag26c); 308 309 int diag49c(unsigned long subcode) 310 { 311 int cc; 312 313 diag_stat_inc(DIAG_STAT_X49C); 314 asm volatile( 315 " diag %[subcode],0,0x49c\n" 316 CC_IPM(cc) 317 : CC_OUT(cc, cc) 318 : [subcode] "d" (subcode) 319 : CC_CLOBBER); 320 return CC_TRANSFORM(cc); 321 } 322 EXPORT_SYMBOL(diag49c); 323