1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
|
// SPDX-License-Identifier: GPL-2.0
/*
* S/390 common I/O routines -- blacklisting of specific devices
*
* Copyright IBM Corp. 1999, 2013
* Author(s): Ingo Adlung (adlung@de.ibm.com)
* Cornelia Huck (cornelia.huck@de.ibm.com)
* Arnd Bergmann (arndb@de.ibm.com)
*/
#define KMSG_COMPONENT "cio"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/init.h>
#include <linux/vmalloc.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/ctype.h>
#include <linux/device.h>
#include <linux/uaccess.h>
#include <asm/cio.h>
#include <asm/ipl.h>
#include "blacklist.h"
#include "cio.h"
#include "cio_debug.h"
#include "css.h"
#include "device.h"
/*
* "Blacklisting" of certain devices:
* Device numbers given in the commandline as cio_ignore=... won't be known
* to Linux.
*
* These can be single devices or ranges of devices
*/
/* 65536 bits for each set to indicate if a devno is blacklisted or not */
#define __BL_DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
(8*sizeof(long)))
static unsigned long bl_dev[__MAX_SSID + 1][__BL_DEV_WORDS];
typedef enum {add, free} range_action;
/*
* Function: blacklist_range
* (Un-)blacklist the devices from-to
*/
static int blacklist_range(range_action action, unsigned int from_ssid,
unsigned int to_ssid, unsigned int from,
unsigned int to, int msgtrigger)
{
if ((from_ssid > to_ssid) || ((from_ssid == to_ssid) && (from > to))) {
if (msgtrigger)
pr_warn("0.%x.%04x to 0.%x.%04x is not a valid range for cio_ignore\n",
from_ssid, from, to_ssid, to);
return 1;
}
while ((from_ssid < to_ssid) || ((from_ssid == to_ssid) &&
(from <= to))) {
if (action == add)
set_bit(from, bl_dev[from_ssid]);
else
clear_bit(from, bl_dev[from_ssid]);
from++;
if (from > __MAX_SUBCHANNEL) {
from_ssid++;
from = 0;
}
}
return 0;
}
static int pure_hex(char **cp, unsigned int *val, int min_digit,
int max_digit, int max_val)
{
int diff;
diff = 0;
*val = 0;
while (diff <= max_digit) {
int value = hex_to_bin(**cp);
if (value < 0)
break;
*val = *val * 16 + value;
(*cp)++;
diff++;
}
if ((diff < min_digit) || (diff > max_digit) || (*val > max_val))
return 1;
return 0;
}
static int parse_busid(char *str, unsigned int *cssid, unsigned int *ssid,
unsigned int *devno, int msgtrigger)
{
char *str_work;
int val, rc, ret;
rc = 1;
if (*str == '\0')
goto out;
/* old style */
str_work = str;
val = simple_strtoul(str, &str_work, 16);
if (*str_work == '\0') {
if (val <= __MAX_SUBCHANNEL) {
*devno = val;
*ssid = 0;
*cssid = 0;
rc = 0;
}
goto out;
}
/* new style */
str_work = str;
ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID);
if (ret || (str_work[0] != '.'))
goto out;
str_work++;
ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID);
if (ret || (str_work[0] != '.'))
goto out;
str_work++;
ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL);
if (ret || (str_work[0] != '\0'))
goto out;
rc = 0;
out:
if (rc && msgtrigger)
pr_warn("%s is not a valid device for the cio_ignore kernel parameter\n",
str);
return rc;
}
static int blacklist_parse_parameters(char *str, range_action action,
int msgtrigger)
{
unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to;
int rc, totalrc;
char *parm;
range_action ra;
totalrc = 0;
while ((parm = strsep(&str, ","))) {
rc = 0;
ra = action;
if (*parm == '!') {
if (ra == add)
ra = free;
else
ra = add;
parm++;
}
if (strcmp(parm, "all") == 0) {
from_cssid = 0;
from_ssid = 0;
from = 0;
to_cssid = __MAX_CSSID;
to_ssid = __MAX_SSID;
to = __MAX_SUBCHANNEL;
} else if (strcmp(parm, "ipldev") == 0) {
if (ipl_info.type == IPL_TYPE_CCW) {
from_cssid = 0;
from_ssid = ipl_info.data.ccw.dev_id.ssid;
from = ipl_info.data.ccw.dev_id.devno;
} else if (ipl_info.type == IPL_TYPE_FCP ||
ipl_info.type == IPL_TYPE_FCP_DUMP) {
from_cssid = 0;
from_ssid = ipl_info.data.fcp.dev_id.ssid;
from = ipl_info.data.fcp.dev_id.devno;
} else {
continue;
}
to_cssid = from_cssid;
to_ssid = from_ssid;
to = from;
} else if (strcmp(parm, "condev") == 0) {
if (console_devno == -1)
continue;
from_cssid = to_cssid = 0;
from_ssid = to_ssid = 0;
from = to = console_devno;
} else {
rc = parse_busid(strsep(&parm, "-"), &from_cssid,
&from_ssid, &from, msgtrigger);
if (!rc) {
if (parm != NULL)
rc = parse_busid(parm, &to_cssid,
&to_ssid, &to,
msgtrigger);
else {
to_cssid = from_cssid;
to_ssid = from_ssid;
to = from;
}
}
}
if (!rc) {
rc = blacklist_range(ra, from_ssid, to_ssid, from, to,
msgtrigger);
if (rc)
totalrc = -EINVAL;
} else
totalrc = -EINVAL;
}
return totalrc;
}
static int __init
blacklist_setup (char *str)
{
CIO_MSG_EVENT(6, "Reading blacklist parameters\n");
if (blacklist_parse_parameters(str, add, 1))
return 0;
return 1;
}
__setup ("cio_ignore=", blacklist_setup);
/* Checking if devices are blacklisted */
/*
* Function: is_blacklisted
* Returns 1 if the given devicenumber can be found in the blacklist,
* otherwise 0.
* Used by validate_subchannel()
*/
int
is_blacklisted (int ssid, int devno)
{
return test_bit (devno, bl_dev[ssid]);
}
#ifdef CONFIG_PROC_FS
/*
* Function: blacklist_parse_proc_parameters
* parse the stuff which is piped to /proc/cio_ignore
*/
static int blacklist_parse_proc_parameters(char *buf)
{
int rc;
char *parm;
parm = strsep(&buf,
|