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 #include <asm/sections.h> 17 18 struct diag_stat { 19 unsigned int counter[NR_DIAG_STAT]; 20 }; 21 22 static DEFINE_PER_CPU(struct diag_stat, diag_stat); 23 24 struct diag_desc { 25 int code; 26 char *name; 27 }; 28 29 static const struct diag_desc diag_map[NR_DIAG_STAT] = { 30 [DIAG_STAT_X008] = { .code = 0x008, .name = "Console Function" }, 31 [DIAG_STAT_X00C] = { .code = 0x00c, .name = "Pseudo Timer" }, 32 [DIAG_STAT_X010] = { .code = 0x010, .name = "Release Pages" }, 33 [DIAG_STAT_X014] = { .code = 0x014, .name = "Spool File Services" }, 34 [DIAG_STAT_X044] = { .code = 0x044, .name = "Voluntary Timeslice End" }, 35 [DIAG_STAT_X064] = { .code = 0x064, .name = "NSS Manipulation" }, 36 [DIAG_STAT_X09C] = { .code = 0x09c, .name = "Relinquish Timeslice" }, 37 [DIAG_STAT_X0DC] = { .code = 0x0dc, .name = "Appldata Control" }, 38 [DIAG_STAT_X204] = { .code = 0x204, .name = "Logical-CPU Utilization" }, 39 [DIAG_STAT_X210] = { .code = 0x210, .name = "Device Information" }, 40 [DIAG_STAT_X224] = { .code = 0x224, .name = "EBCDIC-Name Table" }, 41 [DIAG_STAT_X250] = { .code = 0x250, .name = "Block I/O" }, 42 [DIAG_STAT_X258] = { .code = 0x258, .name = "Page-Reference Services" }, 43 [DIAG_STAT_X26C] = { .code = 0x26c, .name = "Certain System Information" }, 44 [DIAG_STAT_X288] = { .code = 0x288, .name = "Time Bomb" }, 45 [DIAG_STAT_X2C4] = { .code = 0x2c4, .name = "FTP Services" }, 46 [DIAG_STAT_X2FC] = { .code = 0x2fc, .name = "Guest Performance Data" }, 47 [DIAG_STAT_X304] = { .code = 0x304, .name = "Partition-Resource Service" }, 48 [DIAG_STAT_X308] = { .code = 0x308, .name = "List-Directed IPL" }, 49 [DIAG_STAT_X318] = { .code = 0x318, .name = "CP Name and Version Codes" }, 50 [DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" }, 51 }; 52 53 struct diag_ops __bootdata_preserved(diag_dma_ops); 54 struct diag210 *__bootdata_preserved(__diag210_tmp_dma); 55 56 static int show_diag_stat(struct seq_file *m, void *v) 57 { 58 struct diag_stat *stat; 59 unsigned long n = (unsigned long) v - 1; 60 int cpu, prec, tmp; 61 62 get_online_cpus(); 63 if (n == 0) { 64 seq_puts(m, " "); 65 66 for_each_online_cpu(cpu) { 67 prec = 10; 68 for (tmp = 10; cpu >= tmp; tmp *= 10) 69 prec--; 70 seq_printf(m, "%*s%d", prec, "CPU", cpu); 71 } 72 seq_putc(m, '\n'); 73 } else if (n <= NR_DIAG_STAT) { 74 seq_printf(m, "diag %03x:", diag_map[n-1].code); 75 for_each_online_cpu(cpu) { 76 stat = &per_cpu(diag_stat, cpu); 77 seq_printf(m, " %10u", stat->counter[n-1]); 78 } 79 seq_printf(m, " %s\n", diag_map[n-1].name); 80 } 81 put_online_cpus(); 82 return 0; 83 } 84 85 static void *show_diag_stat_start(struct seq_file *m, loff_t *pos) 86 { 87 return *pos <= NR_DIAG_STAT ? (void *)((unsigned long) *pos + 1) : NULL; 88 } 89 90 static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos) 91 { 92 ++*pos; 93 return show_diag_stat_start(m, pos); 94 } 95 96 static void show_diag_stat_stop(struct seq_file *m, void *v) 97 { 98 } 99 100 static const struct seq_operations show_diag_stat_sops = { 101 .start = show_diag_stat_start, 102 .next = show_diag_stat_next, 103 .stop = show_diag_stat_stop, 104 .show = show_diag_stat, 105 }; 106 107 static int show_diag_stat_open(struct inode *inode, struct file *file) 108 { 109 return seq_open(file, &show_diag_stat_sops); 110 } 111 112 static const struct file_operations show_diag_stat_fops = { 113 .open = show_diag_stat_open, 114 .read = seq_read, 115 .llseek = seq_lseek, 116 .release = seq_release, 117 }; 118 119 120 static int __init show_diag_stat_init(void) 121 { 122 debugfs_create_file("diag_stat", 0400, NULL, NULL, 123 &show_diag_stat_fops); 124 return 0; 125 } 126 127 device_initcall(show_diag_stat_init); 128 129 void diag_stat_inc(enum diag_stat_enum nr) 130 { 131 this_cpu_inc(diag_stat.counter[nr]); 132 trace_s390_diagnose(diag_map[nr].code); 133 } 134 EXPORT_SYMBOL(diag_stat_inc); 135 136 void notrace diag_stat_inc_norecursion(enum diag_stat_enum nr) 137 { 138 this_cpu_inc(diag_stat.counter[nr]); 139 trace_s390_diagnose_norecursion(diag_map[nr].code); 140 } 141 EXPORT_SYMBOL(diag_stat_inc_norecursion); 142 143 /* 144 * Diagnose 14: Input spool file manipulation 145 */ 146 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode) 147 { 148 diag_stat_inc(DIAG_STAT_X014); 149 return diag_dma_ops.diag14(rx, ry1, subcode); 150 } 151 EXPORT_SYMBOL(diag14); 152 153 static inline int __diag204(unsigned long *subcode, unsigned long size, void *addr) 154 { 155 register unsigned long _subcode asm("0") = *subcode; 156 register unsigned long _size asm("1") = size; 157 158 asm volatile( 159 " diag %2,%0,0x204\n" 160 "0: nopr %%r7\n" 161 EX_TABLE(0b,0b) 162 : "+d" (_subcode), "+d" (_size) : "d" (addr) : "memory"); 163 *subcode = _subcode; 164 return _size; 165 } 166 167 int diag204(unsigned long subcode, unsigned long size, void *addr) 168 { 169 diag_stat_inc(DIAG_STAT_X204); 170 size = __diag204(&subcode, size, addr); 171 if (subcode) 172 return -1; 173 return size; 174 } 175 EXPORT_SYMBOL(diag204); 176 177 /* 178 * Diagnose 210: Get information about a virtual device 179 */ 180 int diag210(struct diag210 *addr) 181 { 182 static DEFINE_SPINLOCK(diag210_lock); 183 unsigned long flags; 184 int ccode; 185 186 spin_lock_irqsave(&diag210_lock, flags); 187 *__diag210_tmp_dma = *addr; 188 189 diag_stat_inc(DIAG_STAT_X210); 190 ccode = diag_dma_ops.diag210(__diag210_tmp_dma); 191 192 *addr = *__diag210_tmp_dma; 193 spin_unlock_irqrestore(&diag210_lock, flags); 194 195 return ccode; 196 } 197 EXPORT_SYMBOL(diag210); 198 199 int diag224(void *ptr) 200 { 201 int rc = -EOPNOTSUPP; 202 203 diag_stat_inc(DIAG_STAT_X224); 204 asm volatile( 205 " diag %1,%2,0x224\n" 206 "0: lhi %0,0x0\n" 207 "1:\n" 208 EX_TABLE(0b,1b) 209 : "+d" (rc) :"d" (0), "d" (ptr) : "memory"); 210 return rc; 211 } 212 EXPORT_SYMBOL(diag224); 213 214 /* 215 * Diagnose 26C: Access Certain System Information 216 */ 217 int diag26c(void *req, void *resp, enum diag26c_sc subcode) 218 { 219 diag_stat_inc(DIAG_STAT_X26C); 220 return diag_dma_ops.diag26c(req, resp, subcode); 221 } 222 EXPORT_SYMBOL(diag26c); 223