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_X49C] = { .code = 0x49c, .name = "Warning-Track Interruption" },
56 [DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" },
57 };
58
59 struct diag_ops __amode31_ref diag_amode31_ops = {
60 .diag210 = _diag210_amode31,
61 .diag26c = _diag26c_amode31,
62 .diag14 = _diag14_amode31,
63 .diag0c = _diag0c_amode31,
64 .diag8c = _diag8c_amode31,
65 .diag308_reset = _diag308_reset_amode31
66 };
67
68 static struct diag210 _diag210_tmp_amode31 __section(".amode31.data");
69 struct diag210 __amode31_ref *__diag210_tmp_amode31 = &_diag210_tmp_amode31;
70
71 static struct diag8c _diag8c_tmp_amode31 __section(".amode31.data");
72 static struct diag8c __amode31_ref *__diag8c_tmp_amode31 = &_diag8c_tmp_amode31;
73
show_diag_stat(struct seq_file * m,void * v)74 static int show_diag_stat(struct seq_file *m, void *v)
75 {
76 struct diag_stat *stat;
77 unsigned long n = (unsigned long) v - 1;
78 int cpu, prec, tmp;
79
80 cpus_read_lock();
81 if (n == 0) {
82 seq_puts(m, " ");
83
84 for_each_online_cpu(cpu) {
85 prec = 10;
86 for (tmp = 10; cpu >= tmp; tmp *= 10)
87 prec--;
88 seq_printf(m, "%*s%d", prec, "CPU", cpu);
89 }
90 seq_putc(m, '\n');
91 } else if (n <= NR_DIAG_STAT) {
92 seq_printf(m, "diag %03x:", diag_map[n-1].code);
93 for_each_online_cpu(cpu) {
94 stat = &per_cpu(diag_stat, cpu);
95 seq_printf(m, " %10u", stat->counter[n-1]);
96 }
97 seq_printf(m, " %s\n", diag_map[n-1].name);
98 }
99 cpus_read_unlock();
100 return 0;
101 }
102
show_diag_stat_start(struct seq_file * m,loff_t * pos)103 static void *show_diag_stat_start(struct seq_file *m, loff_t *pos)
104 {
105 return *pos <= NR_DIAG_STAT ? (void *)((unsigned long) *pos + 1) : NULL;
106 }
107
show_diag_stat_next(struct seq_file * m,void * v,loff_t * pos)108 static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos)
109 {
110 ++*pos;
111 return show_diag_stat_start(m, pos);
112 }
113
show_diag_stat_stop(struct seq_file * m,void * v)114 static void show_diag_stat_stop(struct seq_file *m, void *v)
115 {
116 }
117
118 static const struct seq_operations show_diag_stat_sops = {
119 .start = show_diag_stat_start,
120 .next = show_diag_stat_next,
121 .stop = show_diag_stat_stop,
122 .show = show_diag_stat,
123 };
124
125 DEFINE_SEQ_ATTRIBUTE(show_diag_stat);
126
show_diag_stat_init(void)127 static int __init show_diag_stat_init(void)
128 {
129 debugfs_create_file("diag_stat", 0400, NULL, NULL,
130 &show_diag_stat_fops);
131 return 0;
132 }
133
134 device_initcall(show_diag_stat_init);
135
diag_stat_inc(enum diag_stat_enum nr)136 void diag_stat_inc(enum diag_stat_enum nr)
137 {
138 this_cpu_inc(diag_stat.counter[nr]);
139 trace_s390_diagnose(diag_map[nr].code);
140 }
141 EXPORT_SYMBOL(diag_stat_inc);
142
diag_stat_inc_norecursion(enum diag_stat_enum nr)143 void notrace diag_stat_inc_norecursion(enum diag_stat_enum nr)
144 {
145 this_cpu_inc(diag_stat.counter[nr]);
146 trace_s390_diagnose_norecursion(diag_map[nr].code);
147 }
148 EXPORT_SYMBOL(diag_stat_inc_norecursion);
149
150 /*
151 * Diagnose 0c: Pseudo Timer
152 */
diag0c(struct hypfs_diag0c_entry * data)153 void diag0c(struct hypfs_diag0c_entry *data)
154 {
155 diag_stat_inc(DIAG_STAT_X00C);
156 diag_amode31_ops.diag0c(virt_to_phys(data));
157 }
158
159 /*
160 * Diagnose 14: Input spool file manipulation
161 *
162 * The subcode parameter determines the type of the first parameter rx.
163 * Currently used are the following 3 subcommands:
164 * 0x0: Read the Next Spool File Buffer (Data Record)
165 * 0x28: Position a Spool File to the Designated Record
166 * 0xfff: Retrieve Next File Descriptor
167 *
168 * For subcommands 0x0 and 0xfff, the value of the first parameter is
169 * a virtual address of a memory buffer and needs virtual to physical
170 * address translation. For other subcommands the rx parameter is not
171 * a virtual address.
172 */
diag14(unsigned long rx,unsigned long ry1,unsigned long subcode)173 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
174 {
175 diag_stat_inc(DIAG_STAT_X014);
176 switch (subcode) {
177 case 0x0:
178 case 0xfff:
179 rx = virt_to_phys((void *)rx);
180 break;
181 default:
182 /* Do nothing */
183 break;
184 }
185 return diag_amode31_ops.diag14(rx, ry1, subcode);
186 }
187 EXPORT_SYMBOL(diag14);
188
189 #define DIAG204_BUSY_RC 8
190
__diag204(unsigned long * subcode,unsigned long size,void * addr)191 static inline int __diag204(unsigned long *subcode, unsigned long size, void *addr)
192 {
193 union register_pair rp = { .even = *subcode, .odd = size };
194
195 asm volatile(
196 " diag %[addr],%[rp],0x204\n"
197 "0: nopr %%r7\n"
198 EX_TABLE(0b,0b)
199 : [rp] "+&d" (rp.pair) : [addr] "d" (addr) : "memory");
200 *subcode = rp.even;
201 return rp.odd;
202 }
203
204 /**
205 * diag204() - Issue diagnose 204 call.
206 * @subcode: Subcode of diagnose 204 to be executed.
207 * @size: Size of area in pages which @area points to, if given.
208 * @addr: Vmalloc'ed memory area where the result is written to.
209 *
210 * Execute diagnose 204 with the given subcode and write the result to the
211 * memory area specified with @addr. For subcodes which do not write a
212 * result to memory both @size and @addr must be zero. If @addr is
213 * specified it must be page aligned and must have been allocated with
214 * vmalloc(). Conversion to real / physical addresses will be handled by
215 * this function if required.
216 */
diag204(unsigned long subcode,unsigned long size,void * addr)217 int diag204(unsigned long subcode, unsigned long size, void *addr)
218 {
219 if (addr) {
220 if (WARN_ON_ONCE(!is_vmalloc_addr(addr)))
221 return -EINVAL;
222 if (WARN_ON_ONCE(!IS_ALIGNED((unsigned long)addr, PAGE_SIZE)))
223 return -EINVAL;
224 }
225 if ((subcode & DIAG204_SUBCODE_MASK) == DIAG204_SUBC_STIB4)
226 addr = (void *)pfn_to_phys(vmalloc_to_pfn(addr));
227 diag_stat_inc(DIAG_STAT_X204);
228 size = __diag204(&subcode, size, addr);
229 if (subcode == DIAG204_BUSY_RC)
230 return -EBUSY;
231 else if (subcode)
232 return -EOPNOTSUPP;
233 return size;
234 }
235 EXPORT_SYMBOL(diag204);
236
237 /*
238 * Diagnose 210: Get information about a virtual device
239 */
diag210(struct diag210 * addr)240 int diag210(struct diag210 *addr)
241 {
242 static DEFINE_SPINLOCK(diag210_lock);
243 unsigned long flags;
244 int ccode;
245
246 spin_lock_irqsave(&diag210_lock, flags);
247 *__diag210_tmp_amode31 = *addr;
248
249 diag_stat_inc(DIAG_STAT_X210);
250 ccode = diag_amode31_ops.diag210(__diag210_tmp_amode31);
251
252 *addr = *__diag210_tmp_amode31;
253 spin_unlock_irqrestore(&diag210_lock, flags);
254
255 return ccode;
256 }
257 EXPORT_SYMBOL(diag210);
258
259 /*
260 * Diagnose 8C: Access 3270 Display Device Information
261 */
diag8c(struct diag8c * addr,struct ccw_dev_id * devno)262 int diag8c(struct diag8c *addr, struct ccw_dev_id *devno)
263 {
264 static DEFINE_SPINLOCK(diag8c_lock);
265 unsigned long flags;
266 int ccode;
267
268 spin_lock_irqsave(&diag8c_lock, flags);
269
270 diag_stat_inc(DIAG_STAT_X08C);
271 ccode = diag_amode31_ops.diag8c(__diag8c_tmp_amode31, devno, sizeof(*addr));
272
273 *addr = *__diag8c_tmp_amode31;
274 spin_unlock_irqrestore(&diag8c_lock, flags);
275
276 return ccode;
277 }
278 EXPORT_SYMBOL(diag8c);
279
diag224(void * ptr)280 int diag224(void *ptr)
281 {
282 unsigned long addr = __pa(ptr);
283 int rc = -EOPNOTSUPP;
284
285 diag_stat_inc(DIAG_STAT_X224);
286 asm volatile("\n"
287 " diag %[type],%[addr],0x224\n"
288 "0: lhi %[rc],0\n"
289 "1:\n"
290 EX_TABLE(0b,1b)
291 : [rc] "+d" (rc)
292 , "=m" (*(struct { char buf[PAGE_SIZE]; } *)ptr)
293 : [type] "d" (0), [addr] "d" (addr));
294 return rc;
295 }
296 EXPORT_SYMBOL(diag224);
297
298 /*
299 * Diagnose 26C: Access Certain System Information
300 */
diag26c(void * req,void * resp,enum diag26c_sc subcode)301 int diag26c(void *req, void *resp, enum diag26c_sc subcode)
302 {
303 diag_stat_inc(DIAG_STAT_X26C);
304 return diag_amode31_ops.diag26c(virt_to_phys(req), virt_to_phys(resp), subcode);
305 }
306 EXPORT_SYMBOL(diag26c);
307
diag49c(unsigned long subcode)308 int diag49c(unsigned long subcode)
309 {
310 int rc;
311
312 diag_stat_inc(DIAG_STAT_X49C);
313 asm volatile(
314 " diag %[subcode],0,0x49c\n"
315 " ipm %[rc]\n"
316 " srl %[rc],28\n"
317 : [rc] "=d" (rc)
318 : [subcode] "d" (subcode)
319 : "cc");
320 return rc;
321 }
322 EXPORT_SYMBOL(diag49c);
323