Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/blacklist.c | |
3 | * S/390 common I/O routines -- blacklisting of specific devices | |
4ce3b30c | 4 | * $Revision: 1.42 $ |
1da177e4 LT |
5 | * |
6 | * Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH, | |
7 | * IBM Corporation | |
8 | * Author(s): Ingo Adlung (adlung@de.ibm.com) | |
4ce3b30c | 9 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
10 | * Arnd Bergmann (arndb@de.ibm.com) |
11 | */ | |
12 | ||
13 | #include <linux/config.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/vmalloc.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/proc_fs.h> | |
678a395b | 18 | #include <linux/seq_file.h> |
1da177e4 LT |
19 | #include <linux/ctype.h> |
20 | #include <linux/device.h> | |
21 | ||
22 | #include <asm/cio.h> | |
23 | #include <asm/uaccess.h> | |
24 | ||
25 | #include "blacklist.h" | |
26 | #include "cio.h" | |
27 | #include "cio_debug.h" | |
28 | #include "css.h" | |
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 | */ | |
48 | static inline void | |
fb6958a5 CH |
49 | blacklist_range (range_action action, unsigned int from, unsigned int to, |
50 | unsigned int ssid) | |
1da177e4 LT |
51 | { |
52 | if (!to) | |
53 | to = from; | |
54 | ||
fb6958a5 | 55 | if (from > to || to > __MAX_SUBCHANNEL || ssid > __MAX_SSID) { |
1da177e4 | 56 | printk (KERN_WARNING "Invalid blacklist range " |
fb6958a5 CH |
57 | "0.%x.%04x to 0.%x.%04x, skipping\n", |
58 | ssid, from, ssid, to); | |
1da177e4 LT |
59 | return; |
60 | } | |
61 | for (; from <= to; from++) { | |
62 | if (action == add) | |
fb6958a5 | 63 | set_bit (from, bl_dev[ssid]); |
1da177e4 | 64 | else |
fb6958a5 | 65 | clear_bit (from, bl_dev[ssid]); |
1da177e4 LT |
66 | } |
67 | } | |
68 | ||
69 | /* | |
70 | * Function: blacklist_busid | |
71 | * Get devno/busid from given string. | |
72 | * Shamelessly grabbed from dasd_devmap.c. | |
73 | */ | |
74 | static inline int | |
fb6958a5 | 75 | blacklist_busid(char **str, int *id0, int *ssid, int *devno) |
1da177e4 LT |
76 | { |
77 | int val, old_style; | |
78 | char *sav; | |
79 | ||
80 | sav = *str; | |
81 | ||
82 | /* check for leading '0x' */ | |
83 | old_style = 0; | |
84 | if ((*str)[0] == '0' && (*str)[1] == 'x') { | |
85 | *str += 2; | |
86 | old_style = 1; | |
87 | } | |
88 | if (!isxdigit((*str)[0])) /* We require at least one hex digit */ | |
89 | goto confused; | |
90 | val = simple_strtoul(*str, str, 16); | |
91 | if (old_style || (*str)[0] != '.') { | |
fb6958a5 | 92 | *id0 = *ssid = 0; |
1da177e4 LT |
93 | if (val < 0 || val > 0xffff) |
94 | goto confused; | |
95 | *devno = val; | |
96 | if ((*str)[0] != ',' && (*str)[0] != '-' && | |
97 | (*str)[0] != '\n' && (*str)[0] != '\0') | |
98 | goto confused; | |
99 | return 0; | |
100 | } | |
101 | /* New style x.y.z busid */ | |
102 | if (val < 0 || val > 0xff) | |
103 | goto confused; | |
104 | *id0 = val; | |
105 | (*str)++; | |
106 | if (!isxdigit((*str)[0])) /* We require at least one hex digit */ | |
107 | goto confused; | |
108 | val = simple_strtoul(*str, str, 16); | |
109 | if (val < 0 || val > 0xff || (*str)++[0] != '.') | |
110 | goto confused; | |
fb6958a5 | 111 | *ssid = val; |
1da177e4 LT |
112 | if (!isxdigit((*str)[0])) /* We require at least one hex digit */ |
113 | goto confused; | |
114 | val = simple_strtoul(*str, str, 16); | |
115 | if (val < 0 || val > 0xffff) | |
116 | goto confused; | |
117 | *devno = val; | |
118 | if ((*str)[0] != ',' && (*str)[0] != '-' && | |
119 | (*str)[0] != '\n' && (*str)[0] != '\0') | |
120 | goto confused; | |
121 | return 0; | |
122 | confused: | |
123 | strsep(str, ",\n"); | |
124 | printk(KERN_WARNING "Invalid cio_ignore parameter '%s'\n", sav); | |
125 | return 1; | |
126 | } | |
127 | ||
128 | static inline int | |
129 | blacklist_parse_parameters (char *str, range_action action) | |
130 | { | |
fb6958a5 | 131 | unsigned int from, to, from_id0, to_id0, from_ssid, to_ssid; |
1da177e4 LT |
132 | |
133 | while (*str != 0 && *str != '\n') { | |
134 | range_action ra = action; | |
135 | while(*str == ',') | |
136 | str++; | |
137 | if (*str == '!') { | |
138 | ra = !action; | |
139 | ++str; | |
140 | } | |
141 | ||
142 | /* | |
143 | * Since we have to parse the proc commands and the | |
144 | * kernel arguments we have to check four cases | |
145 | */ | |
146 | if (strncmp(str,"all,",4) == 0 || strcmp(str,"all") == 0 || | |
147 | strncmp(str,"all\n",4) == 0 || strncmp(str,"all ",4) == 0) { | |
fb6958a5 CH |
148 | int j; |
149 | ||
1da177e4 | 150 | str += 3; |
fb6958a5 CH |
151 | for (j=0; j <= __MAX_SSID; j++) |
152 | blacklist_range(ra, 0, __MAX_SUBCHANNEL, j); | |
1da177e4 LT |
153 | } else { |
154 | int rc; | |
155 | ||
156 | rc = blacklist_busid(&str, &from_id0, | |
fb6958a5 | 157 | &from_ssid, &from); |
1da177e4 LT |
158 | if (rc) |
159 | continue; | |
160 | to = from; | |
161 | to_id0 = from_id0; | |
fb6958a5 | 162 | to_ssid = from_ssid; |
1da177e4 LT |
163 | if (*str == '-') { |
164 | str++; | |
165 | rc = blacklist_busid(&str, &to_id0, | |
fb6958a5 | 166 | &to_ssid, &to); |
1da177e4 LT |
167 | if (rc) |
168 | continue; | |
169 | } | |
170 | if (*str == '-') { | |
171 | printk(KERN_WARNING "invalid cio_ignore " | |
172 | "parameter '%s'\n", | |
173 | strsep(&str, ",\n")); | |
174 | continue; | |
175 | } | |
fb6958a5 CH |
176 | if ((from_id0 != to_id0) || |
177 | (from_ssid != to_ssid)) { | |
1da177e4 LT |
178 | printk(KERN_WARNING "invalid cio_ignore range " |
179 | "%x.%x.%04x-%x.%x.%04x\n", | |
fb6958a5 CH |
180 | from_id0, from_ssid, from, |
181 | to_id0, to_ssid, to); | |
1da177e4 LT |
182 | continue; |
183 | } | |
fb6958a5 CH |
184 | pr_debug("blacklist_setup: adding range " |
185 | "from %x.%x.%04x to %x.%x.%04x\n", | |
186 | from_id0, from_ssid, from, to_id0, to_ssid, to); | |
187 | blacklist_range (ra, from, to, to_ssid); | |
1da177e4 | 188 | } |
1da177e4 LT |
189 | } |
190 | return 1; | |
191 | } | |
192 | ||
193 | /* Parsing the commandline for blacklist parameters, e.g. to blacklist | |
194 | * bus ids 0.0.1234, 0.0.1235 and 0.0.1236, you could use any of: | |
195 | * - cio_ignore=1234-1236 | |
196 | * - cio_ignore=0x1234-0x1235,1236 | |
197 | * - cio_ignore=0x1234,1235-1236 | |
198 | * - cio_ignore=1236 cio_ignore=1234-0x1236 | |
199 | * - cio_ignore=1234 cio_ignore=1236 cio_ignore=0x1235 | |
200 | * - cio_ignore=0.0.1234-0.0.1236 | |
201 | * - cio_ignore=0.0.1234,0x1235,1236 | |
202 | * - ... | |
203 | */ | |
204 | static int __init | |
205 | blacklist_setup (char *str) | |
206 | { | |
207 | CIO_MSG_EVENT(6, "Reading blacklist parameters\n"); | |
208 | return blacklist_parse_parameters (str, add); | |
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 | |
f97a56fb CH |
228 | static int |
229 | __s390_redo_validation(struct subchannel_id schid, void *data) | |
230 | { | |
231 | int ret; | |
232 | struct subchannel *sch; | |
233 | ||
234 | sch = get_subchannel_by_schid(schid); | |
235 | if (sch) { | |
236 | /* Already known. */ | |
237 | put_device(&sch->dev); | |
238 | return 0; | |
239 | } | |
240 | ret = css_probe_device(schid); | |
241 | if (ret == -ENXIO) | |
242 | return ret; /* We're through. */ | |
243 | if (ret == -ENOMEM) | |
244 | /* Stop validation for now. Bad, but no need for a panic. */ | |
245 | return ret; | |
246 | return 0; | |
247 | } | |
248 | ||
1da177e4 LT |
249 | /* |
250 | * Function: s390_redo_validation | |
251 | * Look for no longer blacklisted devices | |
252 | * FIXME: there must be a better way to do this */ | |
253 | static inline void | |
254 | s390_redo_validation (void) | |
255 | { | |
1da177e4 | 256 | CIO_TRACE_EVENT (0, "redoval"); |
1da177e4 | 257 | |
f97a56fb | 258 | for_each_subchannel(__s390_redo_validation, NULL); |
1da177e4 LT |
259 | } |
260 | ||
261 | /* | |
262 | * Function: blacklist_parse_proc_parameters | |
263 | * parse the stuff which is piped to /proc/cio_ignore | |
264 | */ | |
265 | static inline void | |
266 | blacklist_parse_proc_parameters (char *buf) | |
267 | { | |
268 | if (strncmp (buf, "free ", 5) == 0) { | |
269 | blacklist_parse_parameters (buf + 5, free); | |
270 | } else if (strncmp (buf, "add ", 4) == 0) { | |
271 | /* | |
272 | * We don't need to check for known devices since | |
273 | * css_probe_device will handle this correctly. | |
274 | */ | |
275 | blacklist_parse_parameters (buf + 4, add); | |
276 | } else { | |
277 | printk (KERN_WARNING "cio_ignore: Parse error; \n" | |
278 | KERN_WARNING "try using 'free all|<devno-range>," | |
279 | "<devno-range>,...'\n" | |
280 | KERN_WARNING "or 'add <devno-range>," | |
281 | "<devno-range>,...'\n"); | |
282 | return; | |
283 | } | |
284 | ||
285 | s390_redo_validation (); | |
286 | } | |
287 | ||
678a395b CH |
288 | /* Iterator struct for all devices. */ |
289 | struct ccwdev_iter { | |
290 | int devno; | |
fb6958a5 | 291 | int ssid; |
678a395b CH |
292 | int in_range; |
293 | }; | |
294 | ||
295 | static void * | |
296 | cio_ignore_proc_seq_start(struct seq_file *s, loff_t *offset) | |
1da177e4 | 297 | { |
678a395b CH |
298 | struct ccwdev_iter *iter; |
299 | ||
fb6958a5 | 300 | if (*offset >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1)) |
678a395b | 301 | return NULL; |
3b793060 | 302 | iter = kzalloc(sizeof(struct ccwdev_iter), GFP_KERNEL); |
678a395b CH |
303 | if (!iter) |
304 | return ERR_PTR(-ENOMEM); | |
fb6958a5 CH |
305 | iter->ssid = *offset / (__MAX_SUBCHANNEL + 1); |
306 | iter->devno = *offset % (__MAX_SUBCHANNEL + 1); | |
678a395b CH |
307 | return iter; |
308 | } | |
309 | ||
310 | static void | |
311 | cio_ignore_proc_seq_stop(struct seq_file *s, void *it) | |
312 | { | |
313 | if (!IS_ERR(it)) | |
314 | kfree(it); | |
315 | } | |
1da177e4 | 316 | |
678a395b CH |
317 | static void * |
318 | cio_ignore_proc_seq_next(struct seq_file *s, void *it, loff_t *offset) | |
319 | { | |
320 | struct ccwdev_iter *iter; | |
321 | ||
fb6958a5 | 322 | if (*offset >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1)) |
678a395b | 323 | return NULL; |
3b793060 | 324 | iter = it; |
fb6958a5 CH |
325 | if (iter->devno == __MAX_SUBCHANNEL) { |
326 | iter->devno = 0; | |
327 | iter->ssid++; | |
328 | if (iter->ssid > __MAX_SSID) | |
329 | return NULL; | |
330 | } else | |
331 | iter->devno++; | |
678a395b CH |
332 | (*offset)++; |
333 | return iter; | |
1da177e4 LT |
334 | } |
335 | ||
678a395b CH |
336 | static int |
337 | cio_ignore_proc_seq_show(struct seq_file *s, void *it) | |
338 | { | |
339 | struct ccwdev_iter *iter; | |
340 | ||
3b793060 | 341 | iter = it; |
fb6958a5 | 342 | if (!is_blacklisted(iter->ssid, iter->devno)) |
678a395b CH |
343 | /* Not blacklisted, nothing to output. */ |
344 | return 0; | |
345 | if (!iter->in_range) { | |
346 | /* First device in range. */ | |
347 | if ((iter->devno == __MAX_SUBCHANNEL) || | |
fb6958a5 | 348 | !is_blacklisted(iter->ssid, iter->devno + 1)) |
678a395b | 349 | /* Singular device. */ |
fb6958a5 CH |
350 | return seq_printf(s, "0.%x.%04x\n", |
351 | iter->ssid, iter->devno); | |
678a395b | 352 | iter->in_range = 1; |
fb6958a5 | 353 | return seq_printf(s, "0.%x.%04x-", iter->ssid, iter->devno); |
678a395b CH |
354 | } |
355 | if ((iter->devno == __MAX_SUBCHANNEL) || | |
fb6958a5 | 356 | !is_blacklisted(iter->ssid, iter->devno + 1)) { |
678a395b CH |
357 | /* Last device in range. */ |
358 | iter->in_range = 0; | |
fb6958a5 | 359 | return seq_printf(s, "0.%x.%04x\n", iter->ssid, iter->devno); |
678a395b CH |
360 | } |
361 | return 0; | |
362 | } | |
363 | ||
364 | static ssize_t | |
365 | cio_ignore_write(struct file *file, const char __user *user_buf, | |
366 | size_t user_len, loff_t *offset) | |
1da177e4 LT |
367 | { |
368 | char *buf; | |
369 | ||
678a395b CH |
370 | if (*offset) |
371 | return -EINVAL; | |
1da177e4 LT |
372 | if (user_len > 65536) |
373 | user_len = 65536; | |
374 | buf = vmalloc (user_len + 1); /* maybe better use the stack? */ | |
375 | if (buf == NULL) | |
376 | return -ENOMEM; | |
377 | if (strncpy_from_user (buf, user_buf, user_len) < 0) { | |
378 | vfree (buf); | |
379 | return -EFAULT; | |
380 | } | |
381 | buf[user_len] = '\0'; | |
382 | ||
383 | blacklist_parse_proc_parameters (buf); | |
384 | ||
385 | vfree (buf); | |
386 | return user_len; | |
387 | } | |
388 | ||
678a395b CH |
389 | static struct seq_operations cio_ignore_proc_seq_ops = { |
390 | .start = cio_ignore_proc_seq_start, | |
391 | .stop = cio_ignore_proc_seq_stop, | |
392 | .next = cio_ignore_proc_seq_next, | |
393 | .show = cio_ignore_proc_seq_show, | |
394 | }; | |
395 | ||
396 | static int | |
397 | cio_ignore_proc_open(struct inode *inode, struct file *file) | |
398 | { | |
399 | return seq_open(file, &cio_ignore_proc_seq_ops); | |
400 | } | |
401 | ||
402 | static struct file_operations cio_ignore_proc_fops = { | |
403 | .open = cio_ignore_proc_open, | |
404 | .read = seq_read, | |
405 | .llseek = seq_lseek, | |
406 | .release = seq_release, | |
407 | .write = cio_ignore_write, | |
408 | }; | |
409 | ||
1da177e4 LT |
410 | static int |
411 | cio_ignore_proc_init (void) | |
412 | { | |
413 | struct proc_dir_entry *entry; | |
414 | ||
415 | entry = create_proc_entry ("cio_ignore", S_IFREG | S_IRUGO | S_IWUSR, | |
416 | &proc_root); | |
417 | if (!entry) | |
418 | return 0; | |
419 | ||
678a395b | 420 | entry->proc_fops = &cio_ignore_proc_fops; |
1da177e4 LT |
421 | |
422 | return 1; | |
423 | } | |
424 | ||
425 | __initcall (cio_ignore_proc_init); | |
426 | ||
427 | #endif /* CONFIG_PROC_FS */ |