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_X500] = { .code = 0x500, .name = "Virtio Service" }, 56 }; 57 58 struct diag_ops __amode31_ref diag_amode31_ops = { 59 .diag210 = _diag210_amode31, 60 .diag26c = _diag26c_amode31, 61 .diag14 = _diag14_amode31, 62 .diag0c = _diag0c_amode31, 63 .diag8c = _diag8c_amode31, 64 .diag308_reset = _diag308_reset_amode31 65 }; 66 67 static struct diag210 _diag210_tmp_amode31 __section(".amode31.data"); 68 struct diag210 __amode31_ref *__diag210_tmp_amode31 = &_diag210_tmp_amode31; 69 70 static struct diag8c _diag8c_tmp_amode31 __section(".amode31.data"); 71 static struct diag8c __amode31_ref *__diag8c_tmp_amode31 = &_diag8c_tmp_amode31; 72 73 static int show_diag_stat(struct seq_file *m, void *v) 74 { 75 struct diag_stat *stat; 76 unsigned long n = (unsigned long) v - 1; 77 int cpu, prec, tmp; 78 79 cpus_read_lock(); 80 if (n == 0) { 81 seq_puts(m, " "); 82 83 for_each_online_cpu(cpu) { 84 prec = 10; 85 for (tmp = 10; cpu >= tmp; tmp *= 10) 86 prec--; 87 seq_printf(m, "%*s%d", prec, "CPU", cpu); 88 } 89 seq_putc(m, '\n'); 90 } else if (n <= NR_DIAG_STAT) { 91 seq_printf(m, "diag %03x:", diag_map[n-1].code); 92 for_each_online_cpu(cpu) { 93 stat = &per_cpu(diag_stat, cpu); 94 seq_printf(m, " %10u", stat->counter[n-1]); 95 } 96 seq_printf(m, " %s\n", diag_map[n-1].name); 97 } 98 cpus_read_unlock(); 99 return 0; 100 } 101 102 static void *show_diag_stat_start(struct seq_file *m, loff_t *pos) 103 { 104 return *pos <= NR_DIAG_STAT ? (void *)((unsigned long) *pos + 1) : NULL; 105 } 106 107 static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos) 108 { 109 ++*pos; 110 return show_diag_stat_start(m, pos); 111 } 112 113 static void show_diag_stat_stop(struct seq_file *m, void *v) 114 { 115 } 116 117 static const struct seq_operations show_diag_stat_sops = { 118 .start = show_diag_stat_start, 119 .next = show_diag_stat_next, 120 .stop = show_diag_stat_stop, 121 .show = show_diag_stat, 122 }; 123 124 DEFINE_SEQ_ATTRIBUTE(show_diag_stat); 125 126 static int __init show_diag_stat_init(void) 127 { 128 debugfs_create_file("diag_stat", 0400, NULL, NULL, 129 &show_diag_stat_fops); 130 return 0; 131 } 132 133 device_initcall(show_diag_stat_init); 134 135 void diag_stat_inc(enum diag_stat_enum nr) 136 { 137 this_cpu_inc(diag_stat.counter[nr]); 138 trace_s390_diagnose(diag_map[nr].code); 139 } 140 EXPORT_SYMBOL(diag_stat_inc); 141 142 void notrace diag_stat_inc_norecursion(enum diag_stat_enum nr) 143 { 144 this_cpu_inc(diag_stat.counter[nr]); 145 trace_s390_diagnose_norecursion(diag_map[nr].code); 146 } 147 EXPORT_SYMBOL(diag_stat_inc_norecursion); 148 149 /* 150 * Diagnose 0c: Pseudo Timer 151 */ 152 void diag0c(struct hypfs_diag0c_entry *data) 153 { 154 diag_stat_inc(DIAG_STAT_X00C); 155 diag_amode31_ops.diag0c(virt_to_phys(data)); 156 } 157 158 /* 159 * Diagnose 14: Input spool file manipulation 160 * 161 * The subcode parameter determines the type of the first parameter rx. 162 * Currently used are the following 3 subcommands: 163 * 0x0: Read the Next Spool File Buffer (Data Record) 164 * 0x28: Position a Spool File to the Designated Record 165 * 0xfff: Retrieve Next File Descriptor 166 * 167 * For subcommands 0x0 and 0xfff, the value of the first parameter is 168 * a virtual address of a memory buffer and needs virtual to physical 169 * address translation. For other subcommands the rx parameter is not 170 * a virtual address. 171 */ 172 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode) 173 { 174 diag_stat_inc(DIAG_STAT_X014); 175 switch (subcode) { 176 case 0x0: 177 case 0xfff: 178 rx = virt_to_phys((void *)rx); 179 break; 180 default: 181 /* Do nothing */ 182 break; 183 } 184 return diag_amode31_ops.diag14(rx, ry1, subcode); 185 } 186 EXPORT_SYMBOL(diag14); 187 188 #define DIAG204_BUSY_RC 8 189 190 static inline int __diag204(unsigned long *subcode, unsigned long size, void *addr) 191 { 192 union register_pair rp = { .even = *subcode, .odd = size }; 193 194 asm volatile( 195 " diag %[addr],%[rp],0x204\n" 196 "0: nopr %%r7\n" 197 EX_TABLE(0b,0b) 198 : [rp] "+&d" (rp.pair) : [addr] "d" (addr) : "memory"); 199 *subcode = rp.even; 200 return rp.odd; 201 } 202 203 /** 204 * diag204() - Issue diagnose 204 call. 205 * @subcode: Subcode of diagnose 204 to be executed. 206 * @size: Size of area in pages which @area points to, if given. 207 * @addr: Vmalloc'ed memory area where the result is written to. 208 * 209 * Execute diagnose 204 with the given subcode and write the result to the 210 * memory area specified with @addr. For subcodes which do not write a 211 * result to memory both @size and @addr must be zero. If @addr is 212 * specified it must be page aligned and must have been allocated with 213 * vmalloc(). Conversion to real / physical addresses will be handled by 214 * this function if required. 215 */ 216 int diag204(unsigned long subcode, unsigned long size, void *addr) 217 { 218 if (addr) { 219 if (WARN_ON_ONCE(!is_vmalloc_addr(addr))) 220 return -EINVAL; 221 if (WARN_ON_ONCE(!IS_ALIGNED((unsigned long)addr, PAGE_SIZE))) 222 return -EINVAL; 223 } 224 if ((subcode & DIAG204_SUBCODE_MASK) == DIAG204_SUBC_STIB4) 225 addr = (void *)pfn_to_phys(vmalloc_to_pfn(addr)); 226 diag_stat_inc(DIAG_STAT_X204); 227 size = __diag204(&subcode, size, addr); 228 if (subcode == DIAG204_BUSY_RC) 229 return -EBUSY; 230 else if (subcode) 231 return -EOPNOTSUPP; 232 return size; 233 } 234 EXPORT_SYMBOL(diag204); 235 236 /* 237 * Diagnose 210: Get information about a virtual device 238 */ 239 int diag210(struct diag210 *addr) 240 { 241 static DEFINE_SPINLOCK(diag210_lock); 242 unsigned long flags; 243 int ccode; 244 245 spin_lock_irqsave(&diag210_lock, flags); 246 *__diag210_tmp_amode31 = *addr; 247 248 diag_stat_inc(DIAG_STAT_X210); 249 ccode = diag_amode31_ops.diag210(__diag210_tmp_amode31); 250 251 *addr = *__diag210_tmp_amode31; 252 spin_unlock_irqrestore(&diag210_lock, flags); 253 254 return ccode; 255 } 256 EXPORT_SYMBOL(diag210); 257 258 /* 259 * Diagnose 8C: Access 3270 Display Device Information 260 */ 261 int diag8c(struct diag8c *addr, struct ccw_dev_id *devno) 262 { 263 static DEFINE_SPINLOCK(diag8c_lock); 264 unsigned long flags; 265 int ccode; 266 267 spin_lock_irqsave(&diag8c_lock, flags); 268 269 diag_stat_inc(DIAG_STAT_X08C); 270 ccode = diag_amode31_ops.diag8c(__diag8c_tmp_amode31, devno, sizeof(*addr)); 271 272 *addr = *__diag8c_tmp_amode31; 273 spin_unlock_irqrestore(&diag8c_lock, flags); 274 275 return ccode; 276 } 277 EXPORT_SYMBOL(diag8c); 278 279 int diag224(void *ptr) 280 { 281 unsigned long addr = __pa(ptr); 282 int rc = -EOPNOTSUPP; 283 284 diag_stat_inc(DIAG_STAT_X224); 285 asm volatile("\n" 286 " diag %[type],%[addr],0x224\n" 287 "0: lhi %[rc],0\n" 288 "1:\n" 289 EX_TABLE(0b,1b) 290 : [rc] "+d" (rc) 291 , "=m" (*(struct { char buf[PAGE_SIZE]; } *)ptr) 292 : [type] "d" (0), [addr] "d" (addr)); 293 return rc; 294 } 295 EXPORT_SYMBOL(diag224); 296 297 /* 298 * Diagnose 26C: Access Certain System Information 299 */ 300 int diag26c(void *req, void *resp, enum diag26c_sc subcode) 301 { 302 diag_stat_inc(DIAG_STAT_X26C); 303 return diag_amode31_ops.diag26c(virt_to_phys(req), virt_to_phys(resp), subcode); 304 } 305 EXPORT_SYMBOL(diag26c); 306