Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/blacklist.c | |
3 | * S/390 common I/O routines -- blacklisting of specific devices | |
1da177e4 LT |
4 | * |
5 | * Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH, | |
6 | * IBM Corporation | |
7 | * Author(s): Ingo Adlung (adlung@de.ibm.com) | |
4ce3b30c | 8 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
9 | * Arnd Bergmann (arndb@de.ibm.com) |
10 | */ | |
11 | ||
e6d5a428 ME |
12 | #define KMSG_COMPONENT "cio" |
13 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
14 | ||
1da177e4 LT |
15 | #include <linux/init.h> |
16 | #include <linux/vmalloc.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/proc_fs.h> | |
678a395b | 19 | #include <linux/seq_file.h> |
1da177e4 LT |
20 | #include <linux/ctype.h> |
21 | #include <linux/device.h> | |
22 | ||
23 | #include <asm/cio.h> | |
24 | #include <asm/uaccess.h> | |
25 | ||
26 | #include "blacklist.h" | |
27 | #include "cio.h" | |
28 | #include "cio_debug.h" | |
29 | #include "css.h" | |
ecf5d9ef | 30 | #include "device.h" |
1da177e4 LT |
31 | |
32 | /* | |
33 | * "Blacklisting" of certain devices: | |
34 | * Device numbers given in the commandline as cio_ignore=... won't be known | |
35 | * to Linux. | |
36 | * | |
37 | * These can be single devices or ranges of devices | |
38 | */ | |
39 | ||
fb6958a5 | 40 | /* 65536 bits for each set to indicate if a devno is blacklisted or not */ |
a8237fc4 | 41 | #define __BL_DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ |
1da177e4 | 42 | (8*sizeof(long))) |
fb6958a5 | 43 | static unsigned long bl_dev[__MAX_SSID + 1][__BL_DEV_WORDS]; |
1da177e4 LT |
44 | typedef enum {add, free} range_action; |
45 | ||
46 | /* | |
47 | * Function: blacklist_range | |
48 | * (Un-)blacklist the devices from-to | |
49 | */ | |
5b890987 ME |
50 | static int blacklist_range(range_action action, unsigned int from_ssid, |
51 | unsigned int to_ssid, unsigned int from, | |
52 | unsigned int to, int msgtrigger) | |
1da177e4 | 53 | { |
5b890987 ME |
54 | if ((from_ssid > to_ssid) || ((from_ssid == to_ssid) && (from > to))) { |
55 | if (msgtrigger) | |
e6d5a428 ME |
56 | pr_warning("0.%x.%04x to 0.%x.%04x is not a valid " |
57 | "range for cio_ignore\n", from_ssid, from, | |
58 | to_ssid, to); | |
59 | ||
5b890987 | 60 | return 1; |
1da177e4 | 61 | } |
5b890987 ME |
62 | |
63 | while ((from_ssid < to_ssid) || ((from_ssid == to_ssid) && | |
64 | (from <= to))) { | |
1da177e4 | 65 | if (action == add) |
5b890987 | 66 | set_bit(from, bl_dev[from_ssid]); |
1da177e4 | 67 | else |
5b890987 ME |
68 | clear_bit(from, bl_dev[from_ssid]); |
69 | from++; | |
70 | if (from > __MAX_SUBCHANNEL) { | |
71 | from_ssid++; | |
72 | from = 0; | |
73 | } | |
1da177e4 | 74 | } |
5b890987 ME |
75 | |
76 | return 0; | |
1da177e4 LT |
77 | } |
78 | ||
5b890987 ME |
79 | static int pure_hex(char **cp, unsigned int *val, int min_digit, |
80 | int max_digit, int max_val) | |
1da177e4 | 81 | { |
5b890987 ME |
82 | int diff; |
83 | unsigned int value; | |
1da177e4 | 84 | |
5b890987 ME |
85 | diff = 0; |
86 | *val = 0; | |
1da177e4 | 87 | |
5b890987 ME |
88 | while (isxdigit(**cp) && (diff <= max_digit)) { |
89 | ||
90 | if (isdigit(**cp)) | |
91 | value = **cp - '0'; | |
92 | else | |
93 | value = tolower(**cp) - 'a' + 10; | |
94 | *val = *val * 16 + value; | |
95 | (*cp)++; | |
96 | diff++; | |
1da177e4 | 97 | } |
5b890987 ME |
98 | |
99 | if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) | |
100 | return 1; | |
101 | ||
1da177e4 | 102 | return 0; |
1da177e4 LT |
103 | } |
104 | ||
12829126 CH |
105 | static int parse_busid(char *str, unsigned int *cssid, unsigned int *ssid, |
106 | unsigned int *devno, int msgtrigger) | |
1da177e4 | 107 | { |
5b890987 ME |
108 | char *str_work; |
109 | int val, rc, ret; | |
110 | ||
111 | rc = 1; | |
112 | ||
113 | if (*str == '\0') | |
114 | goto out; | |
115 | ||
116 | /* old style */ | |
117 | str_work = str; | |
118 | val = simple_strtoul(str, &str_work, 16); | |
119 | ||
120 | if (*str_work == '\0') { | |
121 | if (val <= __MAX_SUBCHANNEL) { | |
122 | *devno = val; | |
123 | *ssid = 0; | |
124 | *cssid = 0; | |
125 | rc = 0; | |
1da177e4 | 126 | } |
5b890987 ME |
127 | goto out; |
128 | } | |
1da177e4 | 129 | |
5b890987 ME |
130 | /* new style */ |
131 | str_work = str; | |
132 | ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); | |
133 | if (ret || (str_work[0] != '.')) | |
134 | goto out; | |
135 | str_work++; | |
136 | ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); | |
137 | if (ret || (str_work[0] != '.')) | |
138 | goto out; | |
139 | str_work++; | |
140 | ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); | |
141 | if (ret || (str_work[0] != '\0')) | |
142 | goto out; | |
143 | ||
144 | rc = 0; | |
145 | out: | |
146 | if (rc && msgtrigger) | |
e6d5a428 ME |
147 | pr_warning("%s is not a valid device for the cio_ignore " |
148 | "kernel parameter\n", str); | |
5b890987 ME |
149 | |
150 | return rc; | |
151 | } | |
1da177e4 | 152 | |
5b890987 ME |
153 | static int blacklist_parse_parameters(char *str, range_action action, |
154 | int msgtrigger) | |
155 | { | |
12829126 | 156 | unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; |
5b890987 ME |
157 | int rc, totalrc; |
158 | char *parm; | |
159 | range_action ra; | |
160 | ||
161 | totalrc = 0; | |
162 | ||
163 | while ((parm = strsep(&str, ","))) { | |
164 | rc = 0; | |
165 | ra = action; | |
166 | if (*parm == '!') { | |
167 | if (ra == add) | |
168 | ra = free; | |
169 | else | |
170 | ra = add; | |
171 | parm++; | |
172 | } | |
173 | if (strcmp(parm, "all") == 0) { | |
174 | from_cssid = 0; | |
175 | from_ssid = 0; | |
176 | from = 0; | |
177 | to_cssid = __MAX_CSSID; | |
178 | to_ssid = __MAX_SSID; | |
179 | to = __MAX_SUBCHANNEL; | |
180 | } else { | |
181 | rc = parse_busid(strsep(&parm, "-"), &from_cssid, | |
182 | &from_ssid, &from, msgtrigger); | |
183 | if (!rc) { | |
184 | if (parm != NULL) | |
185 | rc = parse_busid(parm, &to_cssid, | |
186 | &to_ssid, &to, | |
187 | msgtrigger); | |
188 | else { | |
189 | to_cssid = from_cssid; | |
190 | to_ssid = from_ssid; | |
191 | to = from; | |
192 | } | |
1da177e4 LT |
193 | } |
194 | } | |
5b890987 ME |
195 | if (!rc) { |
196 | rc = blacklist_range(ra, from_ssid, to_ssid, from, to, | |
197 | msgtrigger); | |
198 | if (rc) | |
ecf5d9ef | 199 | totalrc = -EINVAL; |
5b890987 | 200 | } else |
ecf5d9ef | 201 | totalrc = -EINVAL; |
1da177e4 | 202 | } |
5b890987 ME |
203 | |
204 | return totalrc; | |
1da177e4 LT |
205 | } |
206 | ||
1da177e4 LT |
207 | static int __init |
208 | blacklist_setup (char *str) | |
209 | { | |
5b890987 ME |
210 | CIO_MSG_EVENT(6, "Reading blacklist parameters\n"); |
211 | if (blacklist_parse_parameters(str, add, 1)) | |
212 | return 0; | |
213 | return 1; | |
1da177e4 LT |
214 | } |
215 | ||
216 | __setup ("cio_ignore=", blacklist_setup); | |
217 | ||
218 | /* Checking if devices are blacklisted */ | |
219 | ||
220 | /* | |
221 | * Function: is_blacklisted | |
222 | * Returns 1 if the given devicenumber can be found in the blacklist, | |
223 | * otherwise 0. | |
224 | * Used by validate_subchannel() | |
225 | */ | |
226 | int | |
fb6958a5 | 227 | is_blacklisted (int ssid, int devno) |
1da177e4 | 228 | { |
fb6958a5 | 229 | return test_bit (devno, bl_dev[ssid]); |
1da177e4 LT |
230 | } |
231 | ||
232 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
233 | /* |
234 | * Function: blacklist_parse_proc_parameters | |
235 | * parse the stuff which is piped to /proc/cio_ignore | |
236 | */ | |
5b890987 | 237 | static int blacklist_parse_proc_parameters(char *buf) |
1da177e4 | 238 | { |
5b890987 ME |
239 | int rc; |
240 | char *parm; | |
241 | ||
242 | parm = strsep(&buf, " "); | |
243 | ||
244 | if (strcmp("free", parm) == 0) | |
245 | rc = blacklist_parse_parameters(buf, free, 0); | |
246 | else if (strcmp("add", parm) == 0) | |
247 | rc = blacklist_parse_parameters(buf, add, 0); | |
ecf5d9ef PO |
248 | else if (strcmp("purge", parm) == 0) |
249 | return ccw_purge_blacklisted(); | |
5b890987 | 250 | else |
ecf5d9ef | 251 | return -EINVAL; |
1da177e4 | 252 | |
40154b82 | 253 | css_schedule_reprobe(); |
5b890987 ME |
254 | |
255 | return rc; | |
1da177e4 LT |
256 | } |
257 | ||
678a395b CH |
258 | /* Iterator struct for all devices. */ |
259 | struct ccwdev_iter { | |
260 | int devno; | |
fb6958a5 | 261 | int ssid; |
678a395b CH |
262 | int in_range; |
263 | }; | |
264 | ||
265 | static void * | |
266 | cio_ignore_proc_seq_start(struct seq_file *s, loff_t *offset) | |
1da177e4 | 267 | { |
678a395b CH |
268 | struct ccwdev_iter *iter; |
269 | ||
fb6958a5 | 270 | if (*offset >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1)) |
678a395b | 271 | return NULL; |
3b793060 | 272 | iter = kzalloc(sizeof(struct ccwdev_iter), GFP_KERNEL); |
678a395b CH |
273 | if (!iter) |
274 | return ERR_PTR(-ENOMEM); | |
fb6958a5 CH |
275 | iter->ssid = *offset / (__MAX_SUBCHANNEL + 1); |
276 | iter->devno = *offset % (__MAX_SUBCHANNEL + 1); | |
678a395b CH |
277 | return iter; |
278 | } | |
279 | ||
280 | static void | |
281 | cio_ignore_proc_seq_stop(struct seq_file *s, void *it) | |
282 | { | |
283 | if (!IS_ERR(it)) | |
284 | kfree(it); | |
285 | } | |
1da177e4 | 286 | |
678a395b CH |
287 | static void * |
288 | cio_ignore_proc_seq_next(struct seq_file *s, void *it, loff_t *offset) | |
289 | { | |
290 | struct ccwdev_iter *iter; | |
291 | ||
fb6958a5 | 292 | if (*offset >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1)) |
678a395b | 293 | return NULL; |
3b793060 | 294 | iter = it; |
fb6958a5 CH |
295 | if (iter->devno == __MAX_SUBCHANNEL) { |
296 | iter->devno = 0; | |
297 | iter->ssid++; | |
298 | if (iter->ssid > __MAX_SSID) | |
299 | return NULL; | |
300 | } else | |
301 | iter->devno++; | |
678a395b CH |
302 | (*offset)++; |
303 | return iter; | |
1da177e4 LT |
304 | } |
305 | ||
678a395b CH |
306 | static int |
307 | cio_ignore_proc_seq_show(struct seq_file *s, void *it) | |
308 | { | |
309 | struct ccwdev_iter *iter; | |
310 | ||
3b793060 | 311 | iter = it; |
fb6958a5 | 312 | if (!is_blacklisted(iter->ssid, iter->devno)) |
678a395b CH |
313 | /* Not blacklisted, nothing to output. */ |
314 | return 0; | |
315 | if (!iter->in_range) { | |
316 | /* First device in range. */ | |
317 | if ((iter->devno == __MAX_SUBCHANNEL) || | |
fb6958a5 | 318 | !is_blacklisted(iter->ssid, iter->devno + 1)) |
678a395b | 319 | /* Singular device. */ |
fb6958a5 CH |
320 | return seq_printf(s, "0.%x.%04x\n", |
321 | iter->ssid, iter->devno); | |
678a395b | 322 | iter->in_range = 1; |
fb6958a5 | 323 | return seq_printf(s, "0.%x.%04x-", iter->ssid, iter->devno); |
678a395b CH |
324 | } |
325 | if ((iter->devno == __MAX_SUBCHANNEL) || | |
fb6958a5 | 326 | !is_blacklisted(iter->ssid, iter->devno + 1)) { |
678a395b CH |
327 | /* Last device in range. */ |
328 | iter->in_range = 0; | |
fb6958a5 | 329 | return seq_printf(s, "0.%x.%04x\n", iter->ssid, iter->devno); |
678a395b CH |
330 | } |
331 | return 0; | |
332 | } | |
333 | ||
334 | static ssize_t | |
335 | cio_ignore_write(struct file *file, const char __user *user_buf, | |
336 | size_t user_len, loff_t *offset) | |
1da177e4 LT |
337 | { |
338 | char *buf; | |
94cbc203 | 339 | ssize_t rc, ret, i; |
1da177e4 | 340 | |
678a395b CH |
341 | if (*offset) |
342 | return -EINVAL; | |
1da177e4 LT |
343 | if (user_len > 65536) |
344 | user_len = 65536; | |
345 | buf = vmalloc (user_len + 1); /* maybe better use the stack? */ | |
346 | if (buf == NULL) | |
347 | return -ENOMEM; | |
5b890987 ME |
348 | memset(buf, 0, user_len + 1); |
349 | ||
1da177e4 | 350 | if (strncpy_from_user (buf, user_buf, user_len) < 0) { |
5b890987 ME |
351 | rc = -EFAULT; |
352 | goto out_free; | |
1da177e4 | 353 | } |
1da177e4 | 354 | |
5b890987 ME |
355 | i = user_len - 1; |
356 | while ((i >= 0) && (isspace(buf[i]) || (buf[i] == 0))) { | |
357 | buf[i] = '\0'; | |
358 | i--; | |
359 | } | |
360 | ret = blacklist_parse_proc_parameters(buf); | |
361 | if (ret) | |
ecf5d9ef | 362 | rc = ret; |
5b890987 ME |
363 | else |
364 | rc = user_len; | |
1da177e4 | 365 | |
5b890987 | 366 | out_free: |
1da177e4 | 367 | vfree (buf); |
5b890987 | 368 | return rc; |
1da177e4 LT |
369 | } |
370 | ||
5c81cdbe | 371 | static const struct seq_operations cio_ignore_proc_seq_ops = { |
678a395b CH |
372 | .start = cio_ignore_proc_seq_start, |
373 | .stop = cio_ignore_proc_seq_stop, | |
374 | .next = cio_ignore_proc_seq_next, | |
375 | .show = cio_ignore_proc_seq_show, | |
376 | }; | |
377 | ||
378 | static int | |
379 | cio_ignore_proc_open(struct inode *inode, struct file *file) | |
380 | { | |
381 | return seq_open(file, &cio_ignore_proc_seq_ops); | |
382 | } | |
383 | ||
d54b1fdb | 384 | static const struct file_operations cio_ignore_proc_fops = { |
678a395b CH |
385 | .open = cio_ignore_proc_open, |
386 | .read = seq_read, | |
387 | .llseek = seq_lseek, | |
388 | .release = seq_release, | |
389 | .write = cio_ignore_write, | |
390 | }; | |
391 | ||
1da177e4 LT |
392 | static int |
393 | cio_ignore_proc_init (void) | |
394 | { | |
395 | struct proc_dir_entry *entry; | |
396 | ||
8b594007 DL |
397 | entry = proc_create("cio_ignore", S_IFREG | S_IRUGO | S_IWUSR, NULL, |
398 | &cio_ignore_proc_fops); | |
1da177e4 | 399 | if (!entry) |
a7fbf6bb | 400 | return -ENOENT; |
a7fbf6bb | 401 | return 0; |
1da177e4 LT |
402 | } |
403 | ||
404 | __initcall (cio_ignore_proc_init); | |
405 | ||
406 | #endif /* CONFIG_PROC_FS */ |