Merge commit '81fd23e2b3ccf71c807e671444e8accaba98ca53' of https://git.pengutronix...
[linux-2.6-microblaze.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 <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 DEFINE_SEQ_ATTRIBUTE(show_diag_stat);
108
109 static int __init show_diag_stat_init(void)
110 {
111         debugfs_create_file("diag_stat", 0400, NULL, NULL,
112                             &show_diag_stat_fops);
113         return 0;
114 }
115
116 device_initcall(show_diag_stat_init);
117
118 void diag_stat_inc(enum diag_stat_enum nr)
119 {
120         this_cpu_inc(diag_stat.counter[nr]);
121         trace_s390_diagnose(diag_map[nr].code);
122 }
123 EXPORT_SYMBOL(diag_stat_inc);
124
125 void notrace diag_stat_inc_norecursion(enum diag_stat_enum nr)
126 {
127         this_cpu_inc(diag_stat.counter[nr]);
128         trace_s390_diagnose_norecursion(diag_map[nr].code);
129 }
130 EXPORT_SYMBOL(diag_stat_inc_norecursion);
131
132 /*
133  * Diagnose 14: Input spool file manipulation
134  */
135 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
136 {
137         diag_stat_inc(DIAG_STAT_X014);
138         return diag_dma_ops.diag14(rx, ry1, subcode);
139 }
140 EXPORT_SYMBOL(diag14);
141
142 static inline int __diag204(unsigned long *subcode, unsigned long size, void *addr)
143 {
144         union register_pair rp = { .even = *subcode, .odd = size };
145
146         asm volatile(
147                 "       diag    %[addr],%[rp],0x204\n"
148                 "0:     nopr    %%r7\n"
149                 EX_TABLE(0b,0b)
150                 : [rp] "+&d" (rp.pair) : [addr] "d" (addr) : "memory");
151         *subcode = rp.even;
152         return rp.odd;
153 }
154
155 int diag204(unsigned long subcode, unsigned long size, void *addr)
156 {
157         diag_stat_inc(DIAG_STAT_X204);
158         size = __diag204(&subcode, size, addr);
159         if (subcode)
160                 return -1;
161         return size;
162 }
163 EXPORT_SYMBOL(diag204);
164
165 /*
166  * Diagnose 210: Get information about a virtual device
167  */
168 int diag210(struct diag210 *addr)
169 {
170         static DEFINE_SPINLOCK(diag210_lock);
171         unsigned long flags;
172         int ccode;
173
174         spin_lock_irqsave(&diag210_lock, flags);
175         *__diag210_tmp_dma = *addr;
176
177         diag_stat_inc(DIAG_STAT_X210);
178         ccode = diag_dma_ops.diag210(__diag210_tmp_dma);
179
180         *addr = *__diag210_tmp_dma;
181         spin_unlock_irqrestore(&diag210_lock, flags);
182
183         return ccode;
184 }
185 EXPORT_SYMBOL(diag210);
186
187 int diag224(void *ptr)
188 {
189         int rc = -EOPNOTSUPP;
190
191         diag_stat_inc(DIAG_STAT_X224);
192         asm volatile(
193                 "       diag    %1,%2,0x224\n"
194                 "0:     lhi     %0,0x0\n"
195                 "1:\n"
196                 EX_TABLE(0b,1b)
197                 : "+d" (rc) :"d" (0), "d" (ptr) : "memory");
198         return rc;
199 }
200 EXPORT_SYMBOL(diag224);
201
202 /*
203  * Diagnose 26C: Access Certain System Information
204  */
205 int diag26c(void *req, void *resp, enum diag26c_sc subcode)
206 {
207         diag_stat_inc(DIAG_STAT_X26C);
208         return diag_dma_ops.diag26c(req, resp, subcode);
209 }
210 EXPORT_SYMBOL(diag26c);