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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 | 2 | * S/390 common I/O routines -- blacklisting of specific devices |
1da177e4 | 3 | * |
0e6c83d1 | 4 | * Copyright IBM Corp. 1999, 2013 |
1da177e4 | 5 | * Author(s): Ingo Adlung (adlung@de.ibm.com) |
4ce3b30c | 6 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
7 | * Arnd Bergmann (arndb@de.ibm.com) |
8 | */ | |
9 | ||
e6d5a428 ME |
10 | #define KMSG_COMPONENT "cio" |
11 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
12 | ||
1da177e4 LT |
13 | #include <linux/init.h> |
14 | #include <linux/vmalloc.h> | |
1da177e4 | 15 | #include <linux/proc_fs.h> |
678a395b | 16 | #include <linux/seq_file.h> |
1da177e4 LT |
17 | #include <linux/ctype.h> |
18 | #include <linux/device.h> | |
19 | ||
7c0f6ba6 | 20 | #include <linux/uaccess.h> |
0e6c83d1 SO |
21 | #include <asm/cio.h> |
22 | #include <asm/ipl.h> | |
1da177e4 LT |
23 | |
24 | #include "blacklist.h" | |
25 | #include "cio.h" | |
26 | #include "cio_debug.h" | |
27 | #include "css.h" | |
ecf5d9ef | 28 | #include "device.h" |
1da177e4 LT |
29 | |
30 | /* | |
31 | * "Blacklisting" of certain devices: | |
32 | * Device numbers given in the commandline as cio_ignore=... won't be known | |
33 | * to Linux. | |
34 | * | |
35 | * These can be single devices or ranges of devices | |
36 | */ | |
37 | ||
fb6958a5 | 38 | /* 65536 bits for each set to indicate if a devno is blacklisted or not */ |
a8237fc4 | 39 | #define __BL_DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ |
1da177e4 | 40 | (8*sizeof(long))) |
fb6958a5 | 41 | static unsigned long bl_dev[__MAX_SSID + 1][__BL_DEV_WORDS]; |
1da177e4 LT |
42 | typedef enum {add, free} range_action; |
43 | ||
44 | /* | |
45 | * Function: blacklist_range | |
46 | * (Un-)blacklist the devices from-to | |
47 | */ | |
5b890987 ME |
48 | static int blacklist_range(range_action action, unsigned int from_ssid, |
49 | unsigned int to_ssid, unsigned int from, | |
50 | unsigned int to, int msgtrigger) | |
1da177e4 | 51 | { |
5b890987 ME |
52 | if ((from_ssid > to_ssid) || ((from_ssid == to_ssid) && (from > to))) { |
53 | if (msgtrigger) | |
baebc70a JP |
54 | pr_warn("0.%x.%04x to 0.%x.%04x is not a valid range for cio_ignore\n", |
55 | from_ssid, from, to_ssid, to); | |
e6d5a428 | 56 | |
5b890987 | 57 | return 1; |
1da177e4 | 58 | } |
5b890987 ME |
59 | |
60 | while ((from_ssid < to_ssid) || ((from_ssid == to_ssid) && | |
61 | (from <= to))) { | |
1da177e4 | 62 | if (action == add) |
5b890987 | 63 | set_bit(from, bl_dev[from_ssid]); |
1da177e4 | 64 | else |
5b890987 ME |
65 | clear_bit(from, bl_dev[from_ssid]); |
66 | from++; | |
67 | if (from > __MAX_SUBCHANNEL) { | |
68 | from_ssid++; | |
69 | from = 0; | |
70 | } | |
1da177e4 | 71 | } |
5b890987 ME |
72 | |
73 | return 0; | |
1da177e4 LT |
74 | } |
75 | ||
5b890987 ME |
76 | static int pure_hex(char **cp, unsigned int *val, int min_digit, |
77 | int max_digit, int max_val) | |
1da177e4 | 78 | { |
5b890987 | 79 | int diff; |
1da177e4 | 80 | |
5b890987 ME |
81 | diff = 0; |
82 | *val = 0; | |
1da177e4 | 83 | |
f2777077 AS |
84 | while (diff <= max_digit) { |
85 | int value = hex_to_bin(**cp); | |
5b890987 | 86 | |
f2777077 AS |
87 | if (value < 0) |
88 | break; | |
5b890987 ME |
89 | *val = *val * 16 + value; |
90 | (*cp)++; | |
91 | diff++; | |
1da177e4 | 92 | } |
5b890987 ME |
93 | |
94 | if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) | |
95 | return 1; | |
96 | ||
1da177e4 | 97 | return 0; |
1da177e4 LT |
98 | } |
99 | ||
12829126 CH |
100 | static int parse_busid(char *str, unsigned int *cssid, unsigned int *ssid, |
101 | unsigned int *devno, int msgtrigger) | |
1da177e4 | 102 | { |
5b890987 ME |
103 | char *str_work; |
104 | int val, rc, ret; | |
105 | ||
106 | rc = 1; | |
107 | ||
108 | if (*str == '\0') | |
109 | goto out; | |
110 | ||
111 | /* old style */ | |
112 | str_work = str; | |
113 | val = simple_strtoul(str, &str_work, 16); | |
114 | ||
115 | if (*str_work == '\0') { | |
116 | if (val <= __MAX_SUBCHANNEL) { | |
117 | *devno = val; | |
118 | *ssid = 0; | |
119 | *cssid = 0; | |
120 | rc = 0; | |
1da177e4 | 121 | } |
5b890987 ME |
122 | goto out; |
123 | } | |
1da177e4 | 124 | |
5b890987 ME |
125 | /* new style */ |
126 | str_work = str; | |
127 | ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); | |
128 | if (ret || (str_work[0] != '.')) | |
129 | goto out; | |
130 | str_work++; | |
131 | ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); | |
132 | if (ret || (str_work[0] != '.')) | |
133 | goto out; | |
134 | str_work++; | |
135 | ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); | |
136 | if (ret || (str_work[0] != '\0')) | |
137 | goto out; | |
138 | ||
139 | rc = 0; | |
140 | out: | |
141 | if (rc && msgtrigger) | |
baebc70a JP |
142 | pr_warn("%s is not a valid device for the cio_ignore kernel parameter\n", |
143 | str); | |
5b890987 ME |
144 | |
145 | return rc; | |
146 | } | |
1da177e4 | 147 | |
5b890987 ME |
148 | static int blacklist_parse_parameters(char *str, range_action action, |
149 | int msgtrigger) | |
150 | { | |
12829126 | 151 | unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; |
5b890987 ME |
152 | int rc, totalrc; |
153 | char *parm; | |
154 | range_action ra; | |
155 | ||
156 | totalrc = 0; | |
157 | ||
158 | while ((parm = strsep(&str, ","))) { | |
159 | rc = 0; | |
160 | ra = action; | |
161 | if (*parm == '!') { | |
162 | if (ra == add) | |
163 | ra = free; | |
164 | else | |
165 | ra = add; | |
166 | parm++; | |
167 | } | |
168 | if (strcmp(parm, "all") == 0) { | |
169 | from_cssid = 0; | |
170 | from_ssid = 0; | |
171 | from = 0; | |
172 | to_cssid = __MAX_CSSID; | |
173 | to_ssid = __MAX_SSID; | |
174 | to = __MAX_SUBCHANNEL; | |
0e6c83d1 SO |
175 | } else if (strcmp(parm, "ipldev") == 0) { |
176 | if (ipl_info.type == IPL_TYPE_CCW) { | |
177 | from_cssid = 0; | |
178 | from_ssid = ipl_info.data.ccw.dev_id.ssid; | |
179 | from = ipl_info.data.ccw.dev_id.devno; | |
180 | } else if (ipl_info.type == IPL_TYPE_FCP || | |
181 | ipl_info.type == IPL_TYPE_FCP_DUMP) { | |
182 | from_cssid = 0; | |
183 | from_ssid = ipl_info.data.fcp.dev_id.ssid; | |
184 | from = ipl_info.data.fcp.dev_id.devno; | |
185 | } else { | |
186 | continue; | |
187 | } | |
188 | to_cssid = from_cssid; | |
189 | to_ssid = from_ssid; | |
190 | to = from; | |
d1eb16e6 SO |
191 | } else if (strcmp(parm, "condev") == 0) { |
192 | if (console_devno == -1) | |
193 | continue; | |
194 | ||
195 | from_cssid = to_cssid = 0; | |
196 | from_ssid = to_ssid = 0; | |
197 | from = to = console_devno; | |
5b890987 ME |
198 | } else { |
199 | rc = parse_busid(strsep(&parm, "-"), &from_cssid, | |
200 | &from_ssid, &from, msgtrigger); | |
201 | if (!rc) { | |
202 | if (parm != NULL) | |
203 | rc = parse_busid(parm, &to_cssid, | |
204 | &to_ssid, &to, | |
205 | msgtrigger); | |
206 | else { | |
207 | to_cssid = from_cssid; | |
208 | to_ssid = from_ssid; | |
209 | to = from; | |
210 | } | |
1da177e4 LT |
211 | } |
212 | } | |
5b890987 ME |
213 | if (!rc) { |
214 | rc = blacklist_range(ra, from_ssid, to_ssid, from, to, | |
215 | msgtrigger); | |
216 | if (rc) | |
ecf5d9ef | 217 | totalrc = -EINVAL; |
5b890987 | 218 | } else |
ecf5d9ef | 219 | totalrc = -EINVAL; |
1da177e4 | 220 | } |
5b890987 ME |
221 | |
222 | return totalrc; | |
1da177e4 LT |
223 | } |
224 | ||
1da177e4 LT |
225 | static int __init |
226 | blacklist_setup (char *str) | |
227 | { | |
5b890987 ME |
228 | CIO_MSG_EVENT(6, "Reading blacklist parameters\n"); |
229 | if (blacklist_parse_parameters(str, add, 1)) | |
230 | return 0; | |
231 | return 1; | |
1da177e4 LT |
232 | } |
233 | ||
234 | __setup ("cio_ignore=", blacklist_setup); | |
235 | ||
236 | /* Checking if devices are blacklisted */ | |
237 | ||
238 | /* | |
239 | * Function: is_blacklisted | |
240 | * Returns 1 if the given devicenumber can be found in the blacklist, | |
241 | * otherwise 0. | |
242 | * Used by validate_subchannel() | |
243 | */ | |
244 | int | |
fb6958a5 | 245 | is_blacklisted (int ssid, int devno) |
1da177e4 | 246 | { |
fb6958a5 | 247 | return test_bit (devno, bl_dev[ssid]); |
1da177e4 LT |
248 | } |
249 | ||
250 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
251 | /* |
252 | * Function: blacklist_parse_proc_parameters | |
253 | * parse the stuff which is piped to /proc/cio_ignore | |
254 | */ | |
5b890987 | 255 | static int blacklist_parse_proc_parameters(char *buf) |
1da177e4 | 256 | { |
5b890987 ME |
257 | int rc; |
258 | char *parm; | |
259 | ||
260 | parm = strsep(&buf, " "); | |
261 | ||
e6b25514 | 262 | if (strcmp("free", parm) == 0) { |
5b890987 | 263 | rc = blacklist_parse_parameters(buf, free, 0); |
e6b25514 PO |
264 | css_schedule_eval_all_unreg(0); |
265 | } else if (strcmp("add", parm) == 0) | |
5b890987 | 266 | rc = blacklist_parse_parameters(buf, add, 0); |
ecf5d9ef PO |
267 | else if (strcmp("purge", parm) == 0) |
268 | return ccw_purge_blacklisted(); | |
5b890987 | 269 | else |
ecf5d9ef | 270 | return -EINVAL; |
1da177e4 | 271 | |
5b890987 ME |
272 | |
273 | return rc; | |
1da177e4 LT |
274 | } |
275 | ||
678a395b CH |
276 | /* Iterator struct for all devices. */ |
277 | struct ccwdev_iter { | |
278 | int devno; | |
fb6958a5 | 279 | int ssid; |
678a395b CH |
280 | int in_range; |
281 | }; | |
282 | ||
283 | static void * | |
284 | cio_ignore_proc_seq_start(struct seq_file *s, loff_t *offset) | |
1da177e4 | 285 | { |
05d419b1 | 286 | struct ccwdev_iter *iter = s->private; |
678a395b | 287 | |
fb6958a5 | 288 | if (*offset >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1)) |
678a395b | 289 | return NULL; |
05d419b1 | 290 | memset(iter, 0, sizeof(*iter)); |
fb6958a5 CH |
291 | iter->ssid = *offset / (__MAX_SUBCHANNEL + 1); |
292 | iter->devno = *offset % (__MAX_SUBCHANNEL + 1); | |
678a395b CH |
293 | return iter; |
294 | } | |
295 | ||
296 | static void | |
297 | cio_ignore_proc_seq_stop(struct seq_file *s, void *it) | |
298 | { | |
678a395b | 299 | } |
1da177e4 | 300 | |
678a395b CH |
301 | static void * |
302 | cio_ignore_proc_seq_next(struct seq_file *s, void *it, loff_t *offset) | |
303 | { | |
304 | struct ccwdev_iter *iter; | |
305 | ||
fb6958a5 | 306 | if (*offset >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1)) |
678a395b | 307 | return NULL; |
3b793060 | 308 | iter = it; |
fb6958a5 CH |
309 | if (iter->devno == __MAX_SUBCHANNEL) { |
310 | iter->devno = 0; | |
311 | iter->ssid++; | |
312 | if (iter->ssid > __MAX_SSID) | |
313 | return NULL; | |
314 | } else | |
315 | iter->devno++; | |
678a395b CH |
316 | (*offset)++; |
317 | return iter; | |
1da177e4 LT |
318 | } |
319 | ||
678a395b CH |
320 | static int |
321 | cio_ignore_proc_seq_show(struct seq_file *s, void *it) | |
322 | { | |
323 | struct ccwdev_iter *iter; | |
324 | ||
3b793060 | 325 | iter = it; |
fb6958a5 | 326 | if (!is_blacklisted(iter->ssid, iter->devno)) |
678a395b CH |
327 | /* Not blacklisted, nothing to output. */ |
328 | return 0; | |
329 | if (!iter->in_range) { | |
330 | /* First device in range. */ | |
331 | if ((iter->devno == __MAX_SUBCHANNEL) || | |
c2f0b61d | 332 | !is_blacklisted(iter->ssid, iter->devno + 1)) { |
678a395b | 333 | /* Singular device. */ |
c2f0b61d JP |
334 | seq_printf(s, "0.%x.%04x\n", iter->ssid, iter->devno); |
335 | return 0; | |
336 | } | |
678a395b | 337 | iter->in_range = 1; |
c2f0b61d JP |
338 | seq_printf(s, "0.%x.%04x-", iter->ssid, iter->devno); |
339 | return 0; | |
678a395b CH |
340 | } |
341 | if ((iter->devno == __MAX_SUBCHANNEL) || | |
fb6958a5 | 342 | !is_blacklisted(iter->ssid, iter->devno + 1)) { |
678a395b CH |
343 | /* Last device in range. */ |
344 | iter->in_range = 0; | |
c2f0b61d | 345 | seq_printf(s, "0.%x.%04x\n", iter->ssid, iter->devno); |
678a395b CH |
346 | } |
347 | return 0; | |
348 | } | |
349 | ||
350 | static ssize_t | |
351 | cio_ignore_write(struct file *file, const char __user *user_buf, | |
352 | size_t user_len, loff_t *offset) | |
1da177e4 LT |
353 | { |
354 | char *buf; | |
94cbc203 | 355 | ssize_t rc, ret, i; |
1da177e4 | 356 | |
678a395b CH |
357 | if (*offset) |
358 | return -EINVAL; | |
1da177e4 LT |
359 | if (user_len > 65536) |
360 | user_len = 65536; | |
dc8a5c99 | 361 | buf = vzalloc(user_len + 1); /* maybe better use the stack? */ |
1da177e4 LT |
362 | if (buf == NULL) |
363 | return -ENOMEM; | |
5b890987 | 364 | |
1da177e4 | 365 | if (strncpy_from_user (buf, user_buf, user_len) < 0) { |
5b890987 ME |
366 | rc = -EFAULT; |
367 | goto out_free; | |
1da177e4 | 368 | } |
1da177e4 | 369 | |
5b890987 ME |
370 | i = user_len - 1; |
371 | while ((i >= 0) && (isspace(buf[i]) || (buf[i] == 0))) { | |
372 | buf[i] = '\0'; | |
373 | i--; | |
374 | } | |
375 | ret = blacklist_parse_proc_parameters(buf); | |
376 | if (ret) | |
ecf5d9ef | 377 | rc = ret; |
5b890987 ME |
378 | else |
379 | rc = user_len; | |
1da177e4 | 380 | |
5b890987 | 381 | out_free: |
1da177e4 | 382 | vfree (buf); |
5b890987 | 383 | return rc; |
1da177e4 LT |
384 | } |
385 | ||
5c81cdbe | 386 | static const struct seq_operations cio_ignore_proc_seq_ops = { |
678a395b CH |
387 | .start = cio_ignore_proc_seq_start, |
388 | .stop = cio_ignore_proc_seq_stop, | |
389 | .next = cio_ignore_proc_seq_next, | |
390 | .show = cio_ignore_proc_seq_show, | |
391 | }; | |
392 | ||
393 | static int | |
394 | cio_ignore_proc_open(struct inode *inode, struct file *file) | |
395 | { | |
05d419b1 CB |
396 | return seq_open_private(file, &cio_ignore_proc_seq_ops, |
397 | sizeof(struct ccwdev_iter)); | |
678a395b CH |
398 | } |
399 | ||
d54b1fdb | 400 | static const struct file_operations cio_ignore_proc_fops = { |
678a395b CH |
401 | .open = cio_ignore_proc_open, |
402 | .read = seq_read, | |
403 | .llseek = seq_lseek, | |
05d419b1 | 404 | .release = seq_release_private, |
678a395b CH |
405 | .write = cio_ignore_write, |
406 | }; | |
407 | ||
1da177e4 LT |
408 | static int |
409 | cio_ignore_proc_init (void) | |
410 | { | |
411 | struct proc_dir_entry *entry; | |
412 | ||
8b594007 DL |
413 | entry = proc_create("cio_ignore", S_IFREG | S_IRUGO | S_IWUSR, NULL, |
414 | &cio_ignore_proc_fops); | |
1da177e4 | 415 | if (!entry) |
a7fbf6bb | 416 | return -ENOENT; |
a7fbf6bb | 417 | return 0; |
1da177e4 LT |
418 | } |
419 | ||
420 | __initcall (cio_ignore_proc_init); | |
421 | ||
422 | #endif /* CONFIG_PROC_FS */ |