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_X09C] = { .code = 0x09c, .name = "Relinquish Timeslice" },
39 	[DIAG_STAT_X0DC] = { .code = 0x0dc, .name = "Appldata Control" },
40 	[DIAG_STAT_X204] = { .code = 0x204, .name = "Logical-CPU Utilization" },
41 	[DIAG_STAT_X210] = { .code = 0x210, .name = "Device Information" },
42 	[DIAG_STAT_X224] = { .code = 0x224, .name = "EBCDIC-Name Table" },
43 	[DIAG_STAT_X250] = { .code = 0x250, .name = "Block I/O" },
44 	[DIAG_STAT_X258] = { .code = 0x258, .name = "Page-Reference Services" },
45 	[DIAG_STAT_X26C] = { .code = 0x26c, .name = "Certain System Information" },
46 	[DIAG_STAT_X288] = { .code = 0x288, .name = "Time Bomb" },
47 	[DIAG_STAT_X2C4] = { .code = 0x2c4, .name = "FTP Services" },
48 	[DIAG_STAT_X2FC] = { .code = 0x2fc, .name = "Guest Performance Data" },
49 	[DIAG_STAT_X304] = { .code = 0x304, .name = "Partition-Resource Service" },
50 	[DIAG_STAT_X308] = { .code = 0x308, .name = "List-Directed IPL" },
51 	[DIAG_STAT_X318] = { .code = 0x318, .name = "CP Name and Version Codes" },
52 	[DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" },
53 };
54 
55 struct diag_ops __amode31_ref diag_amode31_ops = {
56 	.diag210 = _diag210_amode31,
57 	.diag26c = _diag26c_amode31,
58 	.diag14 = _diag14_amode31,
59 	.diag0c = _diag0c_amode31,
60 	.diag308_reset = _diag308_reset_amode31
61 };
62 
63 static struct diag210 _diag210_tmp_amode31 __section(".amode31.data");
64 struct diag210 __amode31_ref *__diag210_tmp_amode31 = &_diag210_tmp_amode31;
65 
show_diag_stat(struct seq_file * m,void * v)66 static int show_diag_stat(struct seq_file *m, void *v)
67 {
68 	struct diag_stat *stat;
69 	unsigned long n = (unsigned long) v - 1;
70 	int cpu, prec, tmp;
71 
72 	cpus_read_lock();
73 	if (n == 0) {
74 		seq_puts(m, "         ");
75 
76 		for_each_online_cpu(cpu) {
77 			prec = 10;
78 			for (tmp = 10; cpu >= tmp; tmp *= 10)
79 				prec--;
80 			seq_printf(m, "%*s%d", prec, "CPU", cpu);
81 		}
82 		seq_putc(m, '\n');
83 	} else if (n <= NR_DIAG_STAT) {
84 		seq_printf(m, "diag %03x:", diag_map[n-1].code);
85 		for_each_online_cpu(cpu) {
86 			stat = &per_cpu(diag_stat, cpu);
87 			seq_printf(m, " %10u", stat->counter[n-1]);
88 		}
89 		seq_printf(m, "    %s\n", diag_map[n-1].name);
90 	}
91 	cpus_read_unlock();
92 	return 0;
93 }
94 
show_diag_stat_start(struct seq_file * m,loff_t * pos)95 static void *show_diag_stat_start(struct seq_file *m, loff_t *pos)
96 {
97 	return *pos <= NR_DIAG_STAT ? (void *)((unsigned long) *pos + 1) : NULL;
98 }
99 
show_diag_stat_next(struct seq_file * m,void * v,loff_t * pos)100 static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos)
101 {
102 	++*pos;
103 	return show_diag_stat_start(m, pos);
104 }
105 
show_diag_stat_stop(struct seq_file * m,void * v)106 static void show_diag_stat_stop(struct seq_file *m, void *v)
107 {
108 }
109 
110 static const struct seq_operations show_diag_stat_sops = {
111 	.start	= show_diag_stat_start,
112 	.next	= show_diag_stat_next,
113 	.stop	= show_diag_stat_stop,
114 	.show	= show_diag_stat,
115 };
116 
117 DEFINE_SEQ_ATTRIBUTE(show_diag_stat);
118 
show_diag_stat_init(void)119 static int __init show_diag_stat_init(void)
120 {
121 	debugfs_create_file("diag_stat", 0400, NULL, NULL,
122 			    &show_diag_stat_fops);
123 	return 0;
124 }
125 
126 device_initcall(show_diag_stat_init);
127 
diag_stat_inc(enum diag_stat_enum nr)128 void diag_stat_inc(enum diag_stat_enum nr)
129 {
130 	this_cpu_inc(diag_stat.counter[nr]);
131 	trace_s390_diagnose(diag_map[nr].code);
132 }
133 EXPORT_SYMBOL(diag_stat_inc);
134 
diag_stat_inc_norecursion(enum diag_stat_enum nr)135 void notrace diag_stat_inc_norecursion(enum diag_stat_enum nr)
136 {
137 	this_cpu_inc(diag_stat.counter[nr]);
138 	trace_s390_diagnose_norecursion(diag_map[nr].code);
139 }
140 EXPORT_SYMBOL(diag_stat_inc_norecursion);
141 
142 /*
143  * Diagnose 14: Input spool file manipulation
144  */
diag14(unsigned long rx,unsigned long ry1,unsigned long subcode)145 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
146 {
147 	diag_stat_inc(DIAG_STAT_X014);
148 	return diag_amode31_ops.diag14(rx, ry1, subcode);
149 }
150 EXPORT_SYMBOL(diag14);
151 
__diag204(unsigned long * subcode,unsigned long size,void * addr)152 static inline int __diag204(unsigned long *subcode, unsigned long size, void *addr)
153 {
154 	union register_pair rp = { .even = *subcode, .odd = size };
155 
156 	asm volatile(
157 		"	diag	%[addr],%[rp],0x204\n"
158 		"0:	nopr	%%r7\n"
159 		EX_TABLE(0b,0b)
160 		: [rp] "+&d" (rp.pair) : [addr] "d" (addr) : "memory");
161 	*subcode = rp.even;
162 	return rp.odd;
163 }
164 
diag204(unsigned long subcode,unsigned long size,void * addr)165 int diag204(unsigned long subcode, unsigned long size, void *addr)
166 {
167 	diag_stat_inc(DIAG_STAT_X204);
168 	size = __diag204(&subcode, size, addr);
169 	if (subcode)
170 		return -1;
171 	return size;
172 }
173 EXPORT_SYMBOL(diag204);
174 
175 /*
176  * Diagnose 210: Get information about a virtual device
177  */
diag210(struct diag210 * addr)178 int diag210(struct diag210 *addr)
179 {
180 	static DEFINE_SPINLOCK(diag210_lock);
181 	unsigned long flags;
182 	int ccode;
183 
184 	spin_lock_irqsave(&diag210_lock, flags);
185 	*__diag210_tmp_amode31 = *addr;
186 
187 	diag_stat_inc(DIAG_STAT_X210);
188 	ccode = diag_amode31_ops.diag210(__diag210_tmp_amode31);
189 
190 	*addr = *__diag210_tmp_amode31;
191 	spin_unlock_irqrestore(&diag210_lock, flags);
192 
193 	return ccode;
194 }
195 EXPORT_SYMBOL(diag210);
196 
diag224(void * ptr)197 int diag224(void *ptr)
198 {
199 	int rc = -EOPNOTSUPP;
200 
201 	diag_stat_inc(DIAG_STAT_X224);
202 	asm volatile(
203 		"	diag	%1,%2,0x224\n"
204 		"0:	lhi	%0,0x0\n"
205 		"1:\n"
206 		EX_TABLE(0b,1b)
207 		: "+d" (rc) :"d" (0), "d" (ptr) : "memory");
208 	return rc;
209 }
210 EXPORT_SYMBOL(diag224);
211 
212 /*
213  * Diagnose 26C: Access Certain System Information
214  */
diag26c(void * req,void * resp,enum diag26c_sc subcode)215 int diag26c(void *req, void *resp, enum diag26c_sc subcode)
216 {
217 	diag_stat_inc(DIAG_STAT_X26C);
218 	return diag_amode31_ops.diag26c(req, resp, subcode);
219 }
220 EXPORT_SYMBOL(diag26c);
221