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/asm-extable.h>
15 #include <asm/diag.h>
16 #include <asm/trace/diag.h>
17 #include <asm/sections.h>
18 #include "entry.h"
19
20 struct diag_stat {
21 unsigned int counter[NR_DIAG_STAT];
22 };
23
24 static DEFINE_PER_CPU(struct diag_stat, diag_stat);
25
26 struct diag_desc {
27 int code;
28 char *name;
29 };
30
31 static const struct diag_desc diag_map[NR_DIAG_STAT] = {
32 [DIAG_STAT_X008] = { .code = 0x008, .name = "Console Function" },
33 [DIAG_STAT_X00C] = { .code = 0x00c, .name = "Pseudo Timer" },
34 [DIAG_STAT_X010] = { .code = 0x010, .name = "Release Pages" },
35 [DIAG_STAT_X014] = { .code = 0x014, .name = "Spool File Services" },
36 [DIAG_STAT_X044] = { .code = 0x044, .name = "Voluntary Timeslice End" },
37 [DIAG_STAT_X064] = { .code = 0x064, .name = "NSS Manipulation" },
38 [DIAG_STAT_X08C] = { .code = 0x08c, .name = "Access 3270 Display Device Information" },
39 [DIAG_STAT_X09C] = { .code = 0x09c, .name = "Relinquish Timeslice" },
40 [DIAG_STAT_X0DC] = { .code = 0x0dc, .name = "Appldata Control" },
41 [DIAG_STAT_X204] = { .code = 0x204, .name = "Logical-CPU Utilization" },
42 [DIAG_STAT_X210] = { .code = 0x210, .name = "Device Information" },
43 [DIAG_STAT_X224] = { .code = 0x224, .name = "EBCDIC-Name Table" },
44 [DIAG_STAT_X250] = { .code = 0x250, .name = "Block I/O" },
45 [DIAG_STAT_X258] = { .code = 0x258, .name = "Page-Reference Services" },
46 [DIAG_STAT_X26C] = { .code = 0x26c, .name = "Certain System Information" },
47 [DIAG_STAT_X288] = { .code = 0x288, .name = "Time Bomb" },
48 [DIAG_STAT_X2C4] = { .code = 0x2c4, .name = "FTP Services" },
49 [DIAG_STAT_X2FC] = { .code = 0x2fc, .name = "Guest Performance Data" },
50 [DIAG_STAT_X304] = { .code = 0x304, .name = "Partition-Resource Service" },
51 [DIAG_STAT_X308] = { .code = 0x308, .name = "List-Directed IPL" },
52 [DIAG_STAT_X318] = { .code = 0x318, .name = "CP Name and Version Codes" },
53 [DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" },
54 };
55
56 struct diag_ops __amode31_ref diag_amode31_ops = {
57 .diag210 = _diag210_amode31,
58 .diag26c = _diag26c_amode31,
59 .diag14 = _diag14_amode31,
60 .diag0c = _diag0c_amode31,
61 .diag8c = _diag8c_amode31,
62 .diag308_reset = _diag308_reset_amode31
63 };
64
65 static struct diag210 _diag210_tmp_amode31 __section(".amode31.data");
66 struct diag210 __amode31_ref *__diag210_tmp_amode31 = &_diag210_tmp_amode31;
67
68 static struct diag8c _diag8c_tmp_amode31 __section(".amode31.data");
69 static struct diag8c __amode31_ref *__diag8c_tmp_amode31 = &_diag8c_tmp_amode31;
70
show_diag_stat(struct seq_file * m,void * v)71 static int show_diag_stat(struct seq_file *m, void *v)
72 {
73 struct diag_stat *stat;
74 unsigned long n = (unsigned long) v - 1;
75 int cpu, prec, tmp;
76
77 cpus_read_lock();
78 if (n == 0) {
79 seq_puts(m, " ");
80
81 for_each_online_cpu(cpu) {
82 prec = 10;
83 for (tmp = 10; cpu >= tmp; tmp *= 10)
84 prec--;
85 seq_printf(m, "%*s%d", prec, "CPU", cpu);
86 }
87 seq_putc(m, '\n');
88 } else if (n <= NR_DIAG_STAT) {
89 seq_printf(m, "diag %03x:", diag_map[n-1].code);
90 for_each_online_cpu(cpu) {
91 stat = &per_cpu(diag_stat, cpu);
92 seq_printf(m, " %10u", stat->counter[n-1]);
93 }
94 seq_printf(m, " %s\n", diag_map[n-1].name);
95 }
96 cpus_read_unlock();
97 return 0;
98 }
99
show_diag_stat_start(struct seq_file * m,loff_t * pos)100 static void *show_diag_stat_start(struct seq_file *m, loff_t *pos)
101 {
102 return *pos <= NR_DIAG_STAT ? (void *)((unsigned long) *pos + 1) : NULL;
103 }
104
show_diag_stat_next(struct seq_file * m,void * v,loff_t * pos)105 static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos)
106 {
107 ++*pos;
108 return show_diag_stat_start(m, pos);
109 }
110
show_diag_stat_stop(struct seq_file * m,void * v)111 static void show_diag_stat_stop(struct seq_file *m, void *v)
112 {
113 }
114
115 static const struct seq_operations show_diag_stat_sops = {
116 .start = show_diag_stat_start,
117 .next = show_diag_stat_next,
118 .stop = show_diag_stat_stop,
119 .show = show_diag_stat,
120 };
121
122 DEFINE_SEQ_ATTRIBUTE(show_diag_stat);
123
show_diag_stat_init(void)124 static int __init show_diag_stat_init(void)
125 {
126 debugfs_create_file("diag_stat", 0400, NULL, NULL,
127 &show_diag_stat_fops);
128 return 0;
129 }
130
131 device_initcall(show_diag_stat_init);
132
diag_stat_inc(enum diag_stat_enum nr)133 void diag_stat_inc(enum diag_stat_enum nr)
134 {
135 this_cpu_inc(diag_stat.counter[nr]);
136 trace_s390_diagnose(diag_map[nr].code);
137 }
138 EXPORT_SYMBOL(diag_stat_inc);
139
diag_stat_inc_norecursion(enum diag_stat_enum nr)140 void notrace diag_stat_inc_norecursion(enum diag_stat_enum nr)
141 {
142 this_cpu_inc(diag_stat.counter[nr]);
143 trace_s390_diagnose_norecursion(diag_map[nr].code);
144 }
145 EXPORT_SYMBOL(diag_stat_inc_norecursion);
146
147 /*
148 * Diagnose 14: Input spool file manipulation
149 */
diag14(unsigned long rx,unsigned long ry1,unsigned long subcode)150 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
151 {
152 diag_stat_inc(DIAG_STAT_X014);
153 return diag_amode31_ops.diag14(rx, ry1, subcode);
154 }
155 EXPORT_SYMBOL(diag14);
156
__diag204(unsigned long * subcode,unsigned long size,void * addr)157 static inline int __diag204(unsigned long *subcode, unsigned long size, void *addr)
158 {
159 union register_pair rp = { .even = *subcode, .odd = size };
160
161 asm volatile(
162 " diag %[addr],%[rp],0x204\n"
163 "0: nopr %%r7\n"
164 EX_TABLE(0b,0b)
165 : [rp] "+&d" (rp.pair) : [addr] "d" (addr) : "memory");
166 *subcode = rp.even;
167 return rp.odd;
168 }
169
diag204(unsigned long subcode,unsigned long size,void * addr)170 int diag204(unsigned long subcode, unsigned long size, void *addr)
171 {
172 diag_stat_inc(DIAG_STAT_X204);
173 size = __diag204(&subcode, size, addr);
174 if (subcode)
175 return -1;
176 return size;
177 }
178 EXPORT_SYMBOL(diag204);
179
180 /*
181 * Diagnose 210: Get information about a virtual device
182 */
diag210(struct diag210 * addr)183 int diag210(struct diag210 *addr)
184 {
185 static DEFINE_SPINLOCK(diag210_lock);
186 unsigned long flags;
187 int ccode;
188
189 spin_lock_irqsave(&diag210_lock, flags);
190 *__diag210_tmp_amode31 = *addr;
191
192 diag_stat_inc(DIAG_STAT_X210);
193 ccode = diag_amode31_ops.diag210(__diag210_tmp_amode31);
194
195 *addr = *__diag210_tmp_amode31;
196 spin_unlock_irqrestore(&diag210_lock, flags);
197
198 return ccode;
199 }
200 EXPORT_SYMBOL(diag210);
201
202 /*
203 * Diagnose 210: Get information about a virtual device
204 */
diag8c(struct diag8c * addr,struct ccw_dev_id * devno)205 int diag8c(struct diag8c *addr, struct ccw_dev_id *devno)
206 {
207 static DEFINE_SPINLOCK(diag8c_lock);
208 unsigned long flags;
209 int ccode;
210
211 spin_lock_irqsave(&diag8c_lock, flags);
212
213 diag_stat_inc(DIAG_STAT_X08C);
214 ccode = diag_amode31_ops.diag8c(__diag8c_tmp_amode31, devno, sizeof(*addr));
215
216 *addr = *__diag8c_tmp_amode31;
217 spin_unlock_irqrestore(&diag8c_lock, flags);
218
219 return ccode;
220 }
221 EXPORT_SYMBOL(diag8c);
222
diag224(void * ptr)223 int diag224(void *ptr)
224 {
225 int rc = -EOPNOTSUPP;
226
227 diag_stat_inc(DIAG_STAT_X224);
228 asm volatile(
229 " diag %1,%2,0x224\n"
230 "0: lhi %0,0x0\n"
231 "1:\n"
232 EX_TABLE(0b,1b)
233 : "+d" (rc) :"d" (0), "d" (ptr) : "memory");
234 return rc;
235 }
236 EXPORT_SYMBOL(diag224);
237
238 /*
239 * Diagnose 26C: Access Certain System Information
240 */
diag26c(void * req,void * resp,enum diag26c_sc subcode)241 int diag26c(void *req, void *resp, enum diag26c_sc subcode)
242 {
243 diag_stat_inc(DIAG_STAT_X26C);
244 return diag_amode31_ops.diag26c(req, resp, subcode);
245 }
246 EXPORT_SYMBOL(diag26c);
247