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