xref: /linux/arch/s390/kernel/diag.c (revision af1f459233d4edeef634f559539e7f4b64cb1d25)
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 <linux/vmalloc.h>
15 #include <asm/asm-extable.h>
16 #include <asm/diag.h>
17 #include <asm/trace/diag.h>
18 #include <asm/sections.h>
19 #include "entry.h"
20 
21 struct diag_stat {
22 	unsigned int counter[NR_DIAG_STAT];
23 };
24 
25 static DEFINE_PER_CPU(struct diag_stat, diag_stat);
26 
27 struct diag_desc {
28 	int code;
29 	char *name;
30 };
31 
32 static const struct diag_desc diag_map[NR_DIAG_STAT] = {
33 	[DIAG_STAT_X008] = { .code = 0x008, .name = "Console Function" },
34 	[DIAG_STAT_X00C] = { .code = 0x00c, .name = "Pseudo Timer" },
35 	[DIAG_STAT_X010] = { .code = 0x010, .name = "Release Pages" },
36 	[DIAG_STAT_X014] = { .code = 0x014, .name = "Spool File Services" },
37 	[DIAG_STAT_X044] = { .code = 0x044, .name = "Voluntary Timeslice End" },
38 	[DIAG_STAT_X064] = { .code = 0x064, .name = "NSS Manipulation" },
39 	[DIAG_STAT_X08C] = { .code = 0x08c, .name = "Access 3270 Display Device Information" },
40 	[DIAG_STAT_X09C] = { .code = 0x09c, .name = "Relinquish Timeslice" },
41 	[DIAG_STAT_X0DC] = { .code = 0x0dc, .name = "Appldata Control" },
42 	[DIAG_STAT_X204] = { .code = 0x204, .name = "Logical-CPU Utilization" },
43 	[DIAG_STAT_X210] = { .code = 0x210, .name = "Device Information" },
44 	[DIAG_STAT_X224] = { .code = 0x224, .name = "EBCDIC-Name Table" },
45 	[DIAG_STAT_X250] = { .code = 0x250, .name = "Block I/O" },
46 	[DIAG_STAT_X258] = { .code = 0x258, .name = "Page-Reference Services" },
47 	[DIAG_STAT_X26C] = { .code = 0x26c, .name = "Certain System Information" },
48 	[DIAG_STAT_X288] = { .code = 0x288, .name = "Time Bomb" },
49 	[DIAG_STAT_X2C4] = { .code = 0x2c4, .name = "FTP Services" },
50 	[DIAG_STAT_X2FC] = { .code = 0x2fc, .name = "Guest Performance Data" },
51 	[DIAG_STAT_X304] = { .code = 0x304, .name = "Partition-Resource Service" },
52 	[DIAG_STAT_X308] = { .code = 0x308, .name = "List-Directed IPL" },
53 	[DIAG_STAT_X318] = { .code = 0x318, .name = "CP Name and Version Codes" },
54 	[DIAG_STAT_X320] = { .code = 0x320, .name = "Certificate Store" },
55 	[DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" },
56 };
57 
58 struct diag_ops __amode31_ref diag_amode31_ops = {
59 	.diag210 = _diag210_amode31,
60 	.diag26c = _diag26c_amode31,
61 	.diag14 = _diag14_amode31,
62 	.diag0c = _diag0c_amode31,
63 	.diag8c = _diag8c_amode31,
64 	.diag308_reset = _diag308_reset_amode31
65 };
66 
67 static struct diag210 _diag210_tmp_amode31 __section(".amode31.data");
68 struct diag210 __amode31_ref *__diag210_tmp_amode31 = &_diag210_tmp_amode31;
69 
70 static struct diag8c _diag8c_tmp_amode31 __section(".amode31.data");
71 static struct diag8c __amode31_ref *__diag8c_tmp_amode31 = &_diag8c_tmp_amode31;
72 
73 static int show_diag_stat(struct seq_file *m, void *v)
74 {
75 	struct diag_stat *stat;
76 	unsigned long n = (unsigned long) v - 1;
77 	int cpu, prec, tmp;
78 
79 	cpus_read_lock();
80 	if (n == 0) {
81 		seq_puts(m, "         ");
82 
83 		for_each_online_cpu(cpu) {
84 			prec = 10;
85 			for (tmp = 10; cpu >= tmp; tmp *= 10)
86 				prec--;
87 			seq_printf(m, "%*s%d", prec, "CPU", cpu);
88 		}
89 		seq_putc(m, '\n');
90 	} else if (n <= NR_DIAG_STAT) {
91 		seq_printf(m, "diag %03x:", diag_map[n-1].code);
92 		for_each_online_cpu(cpu) {
93 			stat = &per_cpu(diag_stat, cpu);
94 			seq_printf(m, " %10u", stat->counter[n-1]);
95 		}
96 		seq_printf(m, "    %s\n", diag_map[n-1].name);
97 	}
98 	cpus_read_unlock();
99 	return 0;
100 }
101 
102 static void *show_diag_stat_start(struct seq_file *m, loff_t *pos)
103 {
104 	return *pos <= NR_DIAG_STAT ? (void *)((unsigned long) *pos + 1) : NULL;
105 }
106 
107 static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos)
108 {
109 	++*pos;
110 	return show_diag_stat_start(m, pos);
111 }
112 
113 static void show_diag_stat_stop(struct seq_file *m, void *v)
114 {
115 }
116 
117 static const struct seq_operations show_diag_stat_sops = {
118 	.start	= show_diag_stat_start,
119 	.next	= show_diag_stat_next,
120 	.stop	= show_diag_stat_stop,
121 	.show	= show_diag_stat,
122 };
123 
124 DEFINE_SEQ_ATTRIBUTE(show_diag_stat);
125 
126 static int __init show_diag_stat_init(void)
127 {
128 	debugfs_create_file("diag_stat", 0400, NULL, NULL,
129 			    &show_diag_stat_fops);
130 	return 0;
131 }
132 
133 device_initcall(show_diag_stat_init);
134 
135 void diag_stat_inc(enum diag_stat_enum nr)
136 {
137 	this_cpu_inc(diag_stat.counter[nr]);
138 	trace_s390_diagnose(diag_map[nr].code);
139 }
140 EXPORT_SYMBOL(diag_stat_inc);
141 
142 void notrace diag_stat_inc_norecursion(enum diag_stat_enum nr)
143 {
144 	this_cpu_inc(diag_stat.counter[nr]);
145 	trace_s390_diagnose_norecursion(diag_map[nr].code);
146 }
147 EXPORT_SYMBOL(diag_stat_inc_norecursion);
148 
149 /*
150  * Diagnose 14: Input spool file manipulation
151  */
152 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
153 {
154 	diag_stat_inc(DIAG_STAT_X014);
155 	return diag_amode31_ops.diag14(rx, ry1, subcode);
156 }
157 EXPORT_SYMBOL(diag14);
158 
159 static inline int __diag204(unsigned long *subcode, unsigned long size, void *addr)
160 {
161 	union register_pair rp = { .even = *subcode, .odd = size };
162 
163 	asm volatile(
164 		"	diag	%[addr],%[rp],0x204\n"
165 		"0:	nopr	%%r7\n"
166 		EX_TABLE(0b,0b)
167 		: [rp] "+&d" (rp.pair) : [addr] "d" (addr) : "memory");
168 	*subcode = rp.even;
169 	return rp.odd;
170 }
171 
172 /**
173  * diag204() - Issue diagnose 204 call.
174  * @subcode: Subcode of diagnose 204 to be executed.
175  * @size: Size of area in pages which @area points to, if given.
176  * @addr: Vmalloc'ed memory area where the result is written to.
177  *
178  * Execute diagnose 204 with the given subcode and write the result to the
179  * memory area specified with @addr. For subcodes which do not write a
180  * result to memory both @size and @addr must be zero. If @addr is
181  * specified it must be page aligned and must have been allocated with
182  * vmalloc(). Conversion to real / physical addresses will be handled by
183  * this function if required.
184  */
185 int diag204(unsigned long subcode, unsigned long size, void *addr)
186 {
187 	if (addr) {
188 		if (WARN_ON_ONCE(!is_vmalloc_addr(addr)))
189 			return -1;
190 		if (WARN_ON_ONCE(!IS_ALIGNED((unsigned long)addr, PAGE_SIZE)))
191 			return -1;
192 	}
193 	if ((subcode & DIAG204_SUBCODE_MASK) == DIAG204_SUBC_STIB4)
194 		addr = (void *)pfn_to_phys(vmalloc_to_pfn(addr));
195 	diag_stat_inc(DIAG_STAT_X204);
196 	size = __diag204(&subcode, size, addr);
197 	if (subcode)
198 		return -1;
199 	return size;
200 }
201 EXPORT_SYMBOL(diag204);
202 
203 /*
204  * Diagnose 210: Get information about a virtual device
205  */
206 int diag210(struct diag210 *addr)
207 {
208 	static DEFINE_SPINLOCK(diag210_lock);
209 	unsigned long flags;
210 	int ccode;
211 
212 	spin_lock_irqsave(&diag210_lock, flags);
213 	*__diag210_tmp_amode31 = *addr;
214 
215 	diag_stat_inc(DIAG_STAT_X210);
216 	ccode = diag_amode31_ops.diag210(__diag210_tmp_amode31);
217 
218 	*addr = *__diag210_tmp_amode31;
219 	spin_unlock_irqrestore(&diag210_lock, flags);
220 
221 	return ccode;
222 }
223 EXPORT_SYMBOL(diag210);
224 
225 /*
226  * Diagnose 8C: Access 3270 Display Device Information
227  */
228 int diag8c(struct diag8c *addr, struct ccw_dev_id *devno)
229 {
230 	static DEFINE_SPINLOCK(diag8c_lock);
231 	unsigned long flags;
232 	int ccode;
233 
234 	spin_lock_irqsave(&diag8c_lock, flags);
235 
236 	diag_stat_inc(DIAG_STAT_X08C);
237 	ccode = diag_amode31_ops.diag8c(__diag8c_tmp_amode31, devno, sizeof(*addr));
238 
239 	*addr = *__diag8c_tmp_amode31;
240 	spin_unlock_irqrestore(&diag8c_lock, flags);
241 
242 	return ccode;
243 }
244 EXPORT_SYMBOL(diag8c);
245 
246 int diag224(void *ptr)
247 {
248 	int rc = -EOPNOTSUPP;
249 
250 	diag_stat_inc(DIAG_STAT_X224);
251 	asm volatile(
252 		"	diag	%1,%2,0x224\n"
253 		"0:	lhi	%0,0x0\n"
254 		"1:\n"
255 		EX_TABLE(0b,1b)
256 		: "+d" (rc) :"d" (0), "d" (ptr) : "memory");
257 	return rc;
258 }
259 EXPORT_SYMBOL(diag224);
260 
261 /*
262  * Diagnose 26C: Access Certain System Information
263  */
264 int diag26c(void *req, void *resp, enum diag26c_sc subcode)
265 {
266 	diag_stat_inc(DIAG_STAT_X26C);
267 	return diag_amode31_ops.diag26c(req, resp, subcode);
268 }
269 EXPORT_SYMBOL(diag26c);
270