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[linux.git] / arch / s390 / kernel / diag.c
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 <[email protected]>
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
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
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
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
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
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
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
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  */
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
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
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  */
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  */
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
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  */
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);
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