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 | ||
1da177e4 LT |
12 | #include <linux/init.h> |
13 | #include <linux/vmalloc.h> | |
14 | #include <linux/slab.h> | |
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 | ||
20 | #include <asm/cio.h> | |
21 | #include <asm/uaccess.h> | |
22 | ||
23 | #include "blacklist.h" | |
24 | #include "cio.h" | |
25 | #include "cio_debug.h" | |
26 | #include "css.h" | |
27 | ||
28 | /* | |
29 | * "Blacklisting" of certain devices: | |
30 | * Device numbers given in the commandline as cio_ignore=... won't be known | |
31 | * to Linux. | |
32 | * | |
33 | * These can be single devices or ranges of devices | |
34 | */ | |
35 | ||
fb6958a5 | 36 | /* 65536 bits for each set to indicate if a devno is blacklisted or not */ |
a8237fc4 | 37 | #define __BL_DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ |
1da177e4 | 38 | (8*sizeof(long))) |
fb6958a5 | 39 | static unsigned long bl_dev[__MAX_SSID + 1][__BL_DEV_WORDS]; |
1da177e4 LT |
40 | typedef enum {add, free} range_action; |
41 | ||
42 | /* | |
43 | * Function: blacklist_range | |
44 | * (Un-)blacklist the devices from-to | |
45 | */ | |
5b890987 ME |
46 | static int blacklist_range(range_action action, unsigned int from_ssid, |
47 | unsigned int to_ssid, unsigned int from, | |
48 | unsigned int to, int msgtrigger) | |
1da177e4 | 49 | { |
5b890987 ME |
50 | if ((from_ssid > to_ssid) || ((from_ssid == to_ssid) && (from > to))) { |
51 | if (msgtrigger) | |
52 | printk(KERN_WARNING "cio: Invalid cio_ignore range " | |
53 | "0.%x.%04x-0.%x.%04x\n", from_ssid, from, | |
54 | to_ssid, to); | |
55 | return 1; | |
1da177e4 | 56 | } |
5b890987 ME |
57 | |
58 | while ((from_ssid < to_ssid) || ((from_ssid == to_ssid) && | |
59 | (from <= to))) { | |
1da177e4 | 60 | if (action == add) |
5b890987 | 61 | set_bit(from, bl_dev[from_ssid]); |
1da177e4 | 62 | else |
5b890987 ME |
63 | clear_bit(from, bl_dev[from_ssid]); |
64 | from++; | |
65 | if (from > __MAX_SUBCHANNEL) { | |
66 | from_ssid++; | |
67 | from = 0; | |
68 | } | |
1da177e4 | 69 | } |
5b890987 ME |
70 | |
71 | return 0; | |
1da177e4 LT |
72 | } |
73 | ||
5b890987 ME |
74 | static int pure_hex(char **cp, unsigned int *val, int min_digit, |
75 | int max_digit, int max_val) | |
1da177e4 | 76 | { |
5b890987 ME |
77 | int diff; |
78 | unsigned int value; | |
1da177e4 | 79 | |
5b890987 ME |
80 | diff = 0; |
81 | *val = 0; | |
1da177e4 | 82 | |
5b890987 ME |
83 | while (isxdigit(**cp) && (diff <= max_digit)) { |
84 | ||
85 | if (isdigit(**cp)) | |
86 | value = **cp - '0'; | |
87 | else | |
88 | value = tolower(**cp) - 'a' + 10; | |
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 | ||
5b890987 ME |
100 | static int parse_busid(char *str, int *cssid, int *ssid, int *devno, |
101 | 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) | |
142 | printk(KERN_WARNING "cio: Invalid cio_ignore device '%s'\n", | |
143 | str); | |
144 | ||
145 | return rc; | |
146 | } | |
1da177e4 | 147 | |
5b890987 ME |
148 | static int blacklist_parse_parameters(char *str, range_action action, |
149 | int msgtrigger) | |
150 | { | |
151 | int from_cssid, to_cssid, from_ssid, to_ssid, from, to; | |
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; | |
175 | } else { | |
176 | rc = parse_busid(strsep(&parm, "-"), &from_cssid, | |
177 | &from_ssid, &from, msgtrigger); | |
178 | if (!rc) { | |
179 | if (parm != NULL) | |
180 | rc = parse_busid(parm, &to_cssid, | |
181 | &to_ssid, &to, | |
182 | msgtrigger); | |
183 | else { | |
184 | to_cssid = from_cssid; | |
185 | to_ssid = from_ssid; | |
186 | to = from; | |
187 | } | |
1da177e4 LT |
188 | } |
189 | } | |
5b890987 ME |
190 | if (!rc) { |
191 | rc = blacklist_range(ra, from_ssid, to_ssid, from, to, | |
192 | msgtrigger); | |
193 | if (rc) | |
194 | totalrc = 1; | |
195 | } else | |
196 | totalrc = 1; | |
1da177e4 | 197 | } |
5b890987 ME |
198 | |
199 | return totalrc; | |
1da177e4 LT |
200 | } |
201 | ||
1da177e4 LT |
202 | static int __init |
203 | blacklist_setup (char *str) | |
204 | { | |
5b890987 ME |
205 | CIO_MSG_EVENT(6, "Reading blacklist parameters\n"); |
206 | if (blacklist_parse_parameters(str, add, 1)) | |
207 | return 0; | |
208 | return 1; | |
1da177e4 LT |
209 | } |
210 | ||
211 | __setup ("cio_ignore=", blacklist_setup); | |
212 | ||
213 | /* Checking if devices are blacklisted */ | |
214 | ||
215 | /* | |
216 | * Function: is_blacklisted | |
217 | * Returns 1 if the given devicenumber can be found in the blacklist, | |
218 | * otherwise 0. | |
219 | * Used by validate_subchannel() | |
220 | */ | |
221 | int | |
fb6958a5 | 222 | is_blacklisted (int ssid, int devno) |
1da177e4 | 223 | { |
fb6958a5 | 224 | return test_bit (devno, bl_dev[ssid]); |
1da177e4 LT |
225 | } |
226 | ||
227 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
228 | /* |
229 | * Function: blacklist_parse_proc_parameters | |
230 | * parse the stuff which is piped to /proc/cio_ignore | |
231 | */ | |
5b890987 | 232 | static int blacklist_parse_proc_parameters(char *buf) |
1da177e4 | 233 | { |
5b890987 ME |
234 | int rc; |
235 | char *parm; | |
236 | ||
237 | parm = strsep(&buf, " "); | |
238 | ||
239 | if (strcmp("free", parm) == 0) | |
240 | rc = blacklist_parse_parameters(buf, free, 0); | |
241 | else if (strcmp("add", parm) == 0) | |
242 | rc = blacklist_parse_parameters(buf, add, 0); | |
243 | else | |
244 | return 1; | |
1da177e4 | 245 | |
40154b82 | 246 | css_schedule_reprobe(); |
5b890987 ME |
247 | |
248 | return rc; | |
1da177e4 LT |
249 | } |
250 | ||
678a395b CH |
251 | /* Iterator struct for all devices. */ |
252 | struct ccwdev_iter { | |
253 | int devno; | |
fb6958a5 | 254 | int ssid; |
678a395b CH |
255 | int in_range; |
256 | }; | |
257 | ||
258 | static void * | |
259 | cio_ignore_proc_seq_start(struct seq_file *s, loff_t *offset) | |
1da177e4 | 260 | { |
678a395b CH |
261 | struct ccwdev_iter *iter; |
262 | ||
fb6958a5 | 263 | if (*offset >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1)) |
678a395b | 264 | return NULL; |
3b793060 | 265 | iter = kzalloc(sizeof(struct ccwdev_iter), GFP_KERNEL); |
678a395b CH |
266 | if (!iter) |
267 | return ERR_PTR(-ENOMEM); | |
fb6958a5 CH |
268 | iter->ssid = *offset / (__MAX_SUBCHANNEL + 1); |
269 | iter->devno = *offset % (__MAX_SUBCHANNEL + 1); | |
678a395b CH |
270 | return iter; |
271 | } | |
272 | ||
273 | static void | |
274 | cio_ignore_proc_seq_stop(struct seq_file *s, void *it) | |
275 | { | |
276 | if (!IS_ERR(it)) | |
277 | kfree(it); | |
278 | } | |
1da177e4 | 279 | |
678a395b CH |
280 | static void * |
281 | cio_ignore_proc_seq_next(struct seq_file *s, void *it, loff_t *offset) | |
282 | { | |
283 | struct ccwdev_iter *iter; | |
284 | ||
fb6958a5 | 285 | if (*offset >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1)) |
678a395b | 286 | return NULL; |
3b793060 | 287 | iter = it; |
fb6958a5 CH |
288 | if (iter->devno == __MAX_SUBCHANNEL) { |
289 | iter->devno = 0; | |
290 | iter->ssid++; | |
291 | if (iter->ssid > __MAX_SSID) | |
292 | return NULL; | |
293 | } else | |
294 | iter->devno++; | |
678a395b CH |
295 | (*offset)++; |
296 | return iter; | |
1da177e4 LT |
297 | } |
298 | ||
678a395b CH |
299 | static int |
300 | cio_ignore_proc_seq_show(struct seq_file *s, void *it) | |
301 | { | |
302 | struct ccwdev_iter *iter; | |
303 | ||
3b793060 | 304 | iter = it; |
fb6958a5 | 305 | if (!is_blacklisted(iter->ssid, iter->devno)) |
678a395b CH |
306 | /* Not blacklisted, nothing to output. */ |
307 | return 0; | |
308 | if (!iter->in_range) { | |
309 | /* First device in range. */ | |
310 | if ((iter->devno == __MAX_SUBCHANNEL) || | |
fb6958a5 | 311 | !is_blacklisted(iter->ssid, iter->devno + 1)) |
678a395b | 312 | /* Singular device. */ |
fb6958a5 CH |
313 | return seq_printf(s, "0.%x.%04x\n", |
314 | iter->ssid, iter->devno); | |
678a395b | 315 | iter->in_range = 1; |
fb6958a5 | 316 | return seq_printf(s, "0.%x.%04x-", iter->ssid, iter->devno); |
678a395b CH |
317 | } |
318 | if ((iter->devno == __MAX_SUBCHANNEL) || | |
fb6958a5 | 319 | !is_blacklisted(iter->ssid, iter->devno + 1)) { |
678a395b CH |
320 | /* Last device in range. */ |
321 | iter->in_range = 0; | |
fb6958a5 | 322 | return seq_printf(s, "0.%x.%04x\n", iter->ssid, iter->devno); |
678a395b CH |
323 | } |
324 | return 0; | |
325 | } | |
326 | ||
327 | static ssize_t | |
328 | cio_ignore_write(struct file *file, const char __user *user_buf, | |
329 | size_t user_len, loff_t *offset) | |
1da177e4 LT |
330 | { |
331 | char *buf; | |
5b890987 ME |
332 | size_t i; |
333 | ssize_t rc, ret; | |
1da177e4 | 334 | |
678a395b CH |
335 | if (*offset) |
336 | return -EINVAL; | |
1da177e4 LT |
337 | if (user_len > 65536) |
338 | user_len = 65536; | |
339 | buf = vmalloc (user_len + 1); /* maybe better use the stack? */ | |
340 | if (buf == NULL) | |
341 | return -ENOMEM; | |
5b890987 ME |
342 | memset(buf, 0, user_len + 1); |
343 | ||
1da177e4 | 344 | if (strncpy_from_user (buf, user_buf, user_len) < 0) { |
5b890987 ME |
345 | rc = -EFAULT; |
346 | goto out_free; | |
1da177e4 | 347 | } |
1da177e4 | 348 | |
5b890987 ME |
349 | i = user_len - 1; |
350 | while ((i >= 0) && (isspace(buf[i]) || (buf[i] == 0))) { | |
351 | buf[i] = '\0'; | |
352 | i--; | |
353 | } | |
354 | ret = blacklist_parse_proc_parameters(buf); | |
355 | if (ret) | |
356 | rc = -EINVAL; | |
357 | else | |
358 | rc = user_len; | |
1da177e4 | 359 | |
5b890987 | 360 | out_free: |
1da177e4 | 361 | vfree (buf); |
5b890987 | 362 | return rc; |
1da177e4 LT |
363 | } |
364 | ||
5c81cdbe | 365 | static const struct seq_operations cio_ignore_proc_seq_ops = { |
678a395b CH |
366 | .start = cio_ignore_proc_seq_start, |
367 | .stop = cio_ignore_proc_seq_stop, | |
368 | .next = cio_ignore_proc_seq_next, | |
369 | .show = cio_ignore_proc_seq_show, | |
370 | }; | |
371 | ||
372 | static int | |
373 | cio_ignore_proc_open(struct inode *inode, struct file *file) | |
374 | { | |
375 | return seq_open(file, &cio_ignore_proc_seq_ops); | |
376 | } | |
377 | ||
d54b1fdb | 378 | static const struct file_operations cio_ignore_proc_fops = { |
678a395b CH |
379 | .open = cio_ignore_proc_open, |
380 | .read = seq_read, | |
381 | .llseek = seq_lseek, | |
382 | .release = seq_release, | |
383 | .write = cio_ignore_write, | |
384 | }; | |
385 | ||
1da177e4 LT |
386 | static int |
387 | cio_ignore_proc_init (void) | |
388 | { | |
389 | struct proc_dir_entry *entry; | |
390 | ||
8b594007 DL |
391 | entry = proc_create("cio_ignore", S_IFREG | S_IRUGO | S_IWUSR, NULL, |
392 | &cio_ignore_proc_fops); | |
1da177e4 | 393 | if (!entry) |
a7fbf6bb | 394 | return -ENOENT; |
a7fbf6bb | 395 | return 0; |
1da177e4 LT |
396 | } |
397 | ||
398 | __initcall (cio_ignore_proc_init); | |
399 | ||
400 | #endif /* CONFIG_PROC_FS */ |