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 | */ | |
4d284cac | 46 | static void |
fb6958a5 CH |
47 | blacklist_range (range_action action, unsigned int from, unsigned int to, |
48 | unsigned int ssid) | |
1da177e4 LT |
49 | { |
50 | if (!to) | |
51 | to = from; | |
52 | ||
fb6958a5 | 53 | if (from > to || to > __MAX_SUBCHANNEL || ssid > __MAX_SSID) { |
e556bbbd | 54 | printk (KERN_WARNING "cio: Invalid blacklist range " |
fb6958a5 CH |
55 | "0.%x.%04x to 0.%x.%04x, skipping\n", |
56 | ssid, from, ssid, to); | |
1da177e4 LT |
57 | return; |
58 | } | |
59 | for (; from <= to; from++) { | |
60 | if (action == add) | |
fb6958a5 | 61 | set_bit (from, bl_dev[ssid]); |
1da177e4 | 62 | else |
fb6958a5 | 63 | clear_bit (from, bl_dev[ssid]); |
1da177e4 LT |
64 | } |
65 | } | |
66 | ||
67 | /* | |
68 | * Function: blacklist_busid | |
69 | * Get devno/busid from given string. | |
70 | * Shamelessly grabbed from dasd_devmap.c. | |
71 | */ | |
4d284cac | 72 | static int |
fb6958a5 | 73 | blacklist_busid(char **str, int *id0, int *ssid, int *devno) |
1da177e4 LT |
74 | { |
75 | int val, old_style; | |
76 | char *sav; | |
77 | ||
78 | sav = *str; | |
79 | ||
80 | /* check for leading '0x' */ | |
81 | old_style = 0; | |
82 | if ((*str)[0] == '0' && (*str)[1] == 'x') { | |
83 | *str += 2; | |
84 | old_style = 1; | |
85 | } | |
86 | if (!isxdigit((*str)[0])) /* We require at least one hex digit */ | |
87 | goto confused; | |
88 | val = simple_strtoul(*str, str, 16); | |
89 | if (old_style || (*str)[0] != '.') { | |
fb6958a5 | 90 | *id0 = *ssid = 0; |
1da177e4 LT |
91 | if (val < 0 || val > 0xffff) |
92 | goto confused; | |
93 | *devno = val; | |
94 | if ((*str)[0] != ',' && (*str)[0] != '-' && | |
95 | (*str)[0] != '\n' && (*str)[0] != '\0') | |
96 | goto confused; | |
97 | return 0; | |
98 | } | |
99 | /* New style x.y.z busid */ | |
100 | if (val < 0 || val > 0xff) | |
101 | goto confused; | |
102 | *id0 = val; | |
103 | (*str)++; | |
104 | if (!isxdigit((*str)[0])) /* We require at least one hex digit */ | |
105 | goto confused; | |
106 | val = simple_strtoul(*str, str, 16); | |
107 | if (val < 0 || val > 0xff || (*str)++[0] != '.') | |
108 | goto confused; | |
fb6958a5 | 109 | *ssid = val; |
1da177e4 LT |
110 | if (!isxdigit((*str)[0])) /* We require at least one hex digit */ |
111 | goto confused; | |
112 | val = simple_strtoul(*str, str, 16); | |
113 | if (val < 0 || val > 0xffff) | |
114 | goto confused; | |
115 | *devno = val; | |
116 | if ((*str)[0] != ',' && (*str)[0] != '-' && | |
117 | (*str)[0] != '\n' && (*str)[0] != '\0') | |
118 | goto confused; | |
119 | return 0; | |
120 | confused: | |
121 | strsep(str, ",\n"); | |
e556bbbd | 122 | printk(KERN_WARNING "cio: Invalid cio_ignore parameter '%s'\n", sav); |
1da177e4 LT |
123 | return 1; |
124 | } | |
125 | ||
4d284cac | 126 | static int |
1da177e4 LT |
127 | blacklist_parse_parameters (char *str, range_action action) |
128 | { | |
2b67fc46 | 129 | int from, to, from_id0, to_id0, from_ssid, to_ssid; |
1da177e4 LT |
130 | |
131 | while (*str != 0 && *str != '\n') { | |
132 | range_action ra = action; | |
133 | while(*str == ',') | |
134 | str++; | |
135 | if (*str == '!') { | |
136 | ra = !action; | |
137 | ++str; | |
138 | } | |
139 | ||
140 | /* | |
141 | * Since we have to parse the proc commands and the | |
142 | * kernel arguments we have to check four cases | |
143 | */ | |
144 | if (strncmp(str,"all,",4) == 0 || strcmp(str,"all") == 0 || | |
145 | strncmp(str,"all\n",4) == 0 || strncmp(str,"all ",4) == 0) { | |
fb6958a5 CH |
146 | int j; |
147 | ||
1da177e4 | 148 | str += 3; |
fb6958a5 CH |
149 | for (j=0; j <= __MAX_SSID; j++) |
150 | blacklist_range(ra, 0, __MAX_SUBCHANNEL, j); | |
1da177e4 LT |
151 | } else { |
152 | int rc; | |
153 | ||
154 | rc = blacklist_busid(&str, &from_id0, | |
fb6958a5 | 155 | &from_ssid, &from); |
1da177e4 LT |
156 | if (rc) |
157 | continue; | |
158 | to = from; | |
159 | to_id0 = from_id0; | |
fb6958a5 | 160 | to_ssid = from_ssid; |
1da177e4 LT |
161 | if (*str == '-') { |
162 | str++; | |
163 | rc = blacklist_busid(&str, &to_id0, | |
fb6958a5 | 164 | &to_ssid, &to); |
1da177e4 LT |
165 | if (rc) |
166 | continue; | |
167 | } | |
168 | if (*str == '-') { | |
e556bbbd | 169 | printk(KERN_WARNING "cio: invalid cio_ignore " |
1da177e4 LT |
170 | "parameter '%s'\n", |
171 | strsep(&str, ",\n")); | |
172 | continue; | |
173 | } | |
fb6958a5 CH |
174 | if ((from_id0 != to_id0) || |
175 | (from_ssid != to_ssid)) { | |
e556bbbd CH |
176 | printk(KERN_WARNING "cio: invalid cio_ignore " |
177 | "range %x.%x.%04x-%x.%x.%04x\n", | |
178 | from_id0, from_ssid, from, | |
179 | to_id0, to_ssid, to); | |
1da177e4 LT |
180 | continue; |
181 | } | |
fb6958a5 | 182 | blacklist_range (ra, from, to, to_ssid); |
1da177e4 | 183 | } |
1da177e4 LT |
184 | } |
185 | return 1; | |
186 | } | |
187 | ||
188 | /* Parsing the commandline for blacklist parameters, e.g. to blacklist | |
189 | * bus ids 0.0.1234, 0.0.1235 and 0.0.1236, you could use any of: | |
190 | * - cio_ignore=1234-1236 | |
191 | * - cio_ignore=0x1234-0x1235,1236 | |
192 | * - cio_ignore=0x1234,1235-1236 | |
193 | * - cio_ignore=1236 cio_ignore=1234-0x1236 | |
194 | * - cio_ignore=1234 cio_ignore=1236 cio_ignore=0x1235 | |
195 | * - cio_ignore=0.0.1234-0.0.1236 | |
196 | * - cio_ignore=0.0.1234,0x1235,1236 | |
197 | * - ... | |
198 | */ | |
199 | static int __init | |
200 | blacklist_setup (char *str) | |
201 | { | |
202 | CIO_MSG_EVENT(6, "Reading blacklist parameters\n"); | |
203 | return blacklist_parse_parameters (str, add); | |
204 | } | |
205 | ||
206 | __setup ("cio_ignore=", blacklist_setup); | |
207 | ||
208 | /* Checking if devices are blacklisted */ | |
209 | ||
210 | /* | |
211 | * Function: is_blacklisted | |
212 | * Returns 1 if the given devicenumber can be found in the blacklist, | |
213 | * otherwise 0. | |
214 | * Used by validate_subchannel() | |
215 | */ | |
216 | int | |
fb6958a5 | 217 | is_blacklisted (int ssid, int devno) |
1da177e4 | 218 | { |
fb6958a5 | 219 | return test_bit (devno, bl_dev[ssid]); |
1da177e4 LT |
220 | } |
221 | ||
222 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
223 | /* |
224 | * Function: blacklist_parse_proc_parameters | |
225 | * parse the stuff which is piped to /proc/cio_ignore | |
226 | */ | |
4d284cac | 227 | static void |
1da177e4 LT |
228 | blacklist_parse_proc_parameters (char *buf) |
229 | { | |
230 | if (strncmp (buf, "free ", 5) == 0) { | |
231 | blacklist_parse_parameters (buf + 5, free); | |
232 | } else if (strncmp (buf, "add ", 4) == 0) { | |
233 | /* | |
234 | * We don't need to check for known devices since | |
235 | * css_probe_device will handle this correctly. | |
236 | */ | |
237 | blacklist_parse_parameters (buf + 4, add); | |
238 | } else { | |
e556bbbd | 239 | printk (KERN_WARNING "cio: cio_ignore: Parse error; \n" |
1da177e4 LT |
240 | KERN_WARNING "try using 'free all|<devno-range>," |
241 | "<devno-range>,...'\n" | |
242 | KERN_WARNING "or 'add <devno-range>," | |
243 | "<devno-range>,...'\n"); | |
244 | return; | |
245 | } | |
246 | ||
40154b82 | 247 | css_schedule_reprobe(); |
1da177e4 LT |
248 | } |
249 | ||
678a395b CH |
250 | /* Iterator struct for all devices. */ |
251 | struct ccwdev_iter { | |
252 | int devno; | |
fb6958a5 | 253 | int ssid; |
678a395b CH |
254 | int in_range; |
255 | }; | |
256 | ||
257 | static void * | |
258 | cio_ignore_proc_seq_start(struct seq_file *s, loff_t *offset) | |
1da177e4 | 259 | { |
678a395b CH |
260 | struct ccwdev_iter *iter; |
261 | ||
fb6958a5 | 262 | if (*offset >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1)) |
678a395b | 263 | return NULL; |
3b793060 | 264 | iter = kzalloc(sizeof(struct ccwdev_iter), GFP_KERNEL); |
678a395b CH |
265 | if (!iter) |
266 | return ERR_PTR(-ENOMEM); | |
fb6958a5 CH |
267 | iter->ssid = *offset / (__MAX_SUBCHANNEL + 1); |
268 | iter->devno = *offset % (__MAX_SUBCHANNEL + 1); | |
678a395b CH |
269 | return iter; |
270 | } | |
271 | ||
272 | static void | |
273 | cio_ignore_proc_seq_stop(struct seq_file *s, void *it) | |
274 | { | |
275 | if (!IS_ERR(it)) | |
276 | kfree(it); | |
277 | } | |
1da177e4 | 278 | |
678a395b CH |
279 | static void * |
280 | cio_ignore_proc_seq_next(struct seq_file *s, void *it, loff_t *offset) | |
281 | { | |
282 | struct ccwdev_iter *iter; | |
283 | ||
fb6958a5 | 284 | if (*offset >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1)) |
678a395b | 285 | return NULL; |
3b793060 | 286 | iter = it; |
fb6958a5 CH |
287 | if (iter->devno == __MAX_SUBCHANNEL) { |
288 | iter->devno = 0; | |
289 | iter->ssid++; | |
290 | if (iter->ssid > __MAX_SSID) | |
291 | return NULL; | |
292 | } else | |
293 | iter->devno++; | |
678a395b CH |
294 | (*offset)++; |
295 | return iter; | |
1da177e4 LT |
296 | } |
297 | ||
678a395b CH |
298 | static int |
299 | cio_ignore_proc_seq_show(struct seq_file *s, void *it) | |
300 | { | |
301 | struct ccwdev_iter *iter; | |
302 | ||
3b793060 | 303 | iter = it; |
fb6958a5 | 304 | if (!is_blacklisted(iter->ssid, iter->devno)) |
678a395b CH |
305 | /* Not blacklisted, nothing to output. */ |
306 | return 0; | |
307 | if (!iter->in_range) { | |
308 | /* First device in range. */ | |
309 | if ((iter->devno == __MAX_SUBCHANNEL) || | |
fb6958a5 | 310 | !is_blacklisted(iter->ssid, iter->devno + 1)) |
678a395b | 311 | /* Singular device. */ |
fb6958a5 CH |
312 | return seq_printf(s, "0.%x.%04x\n", |
313 | iter->ssid, iter->devno); | |
678a395b | 314 | iter->in_range = 1; |
fb6958a5 | 315 | return seq_printf(s, "0.%x.%04x-", iter->ssid, iter->devno); |
678a395b CH |
316 | } |
317 | if ((iter->devno == __MAX_SUBCHANNEL) || | |
fb6958a5 | 318 | !is_blacklisted(iter->ssid, iter->devno + 1)) { |
678a395b CH |
319 | /* Last device in range. */ |
320 | iter->in_range = 0; | |
fb6958a5 | 321 | return seq_printf(s, "0.%x.%04x\n", iter->ssid, iter->devno); |
678a395b CH |
322 | } |
323 | return 0; | |
324 | } | |
325 | ||
326 | static ssize_t | |
327 | cio_ignore_write(struct file *file, const char __user *user_buf, | |
328 | size_t user_len, loff_t *offset) | |
1da177e4 LT |
329 | { |
330 | char *buf; | |
331 | ||
678a395b CH |
332 | if (*offset) |
333 | return -EINVAL; | |
1da177e4 LT |
334 | if (user_len > 65536) |
335 | user_len = 65536; | |
336 | buf = vmalloc (user_len + 1); /* maybe better use the stack? */ | |
337 | if (buf == NULL) | |
338 | return -ENOMEM; | |
339 | if (strncpy_from_user (buf, user_buf, user_len) < 0) { | |
340 | vfree (buf); | |
341 | return -EFAULT; | |
342 | } | |
343 | buf[user_len] = '\0'; | |
344 | ||
345 | blacklist_parse_proc_parameters (buf); | |
346 | ||
347 | vfree (buf); | |
348 | return user_len; | |
349 | } | |
350 | ||
678a395b CH |
351 | static struct seq_operations cio_ignore_proc_seq_ops = { |
352 | .start = cio_ignore_proc_seq_start, | |
353 | .stop = cio_ignore_proc_seq_stop, | |
354 | .next = cio_ignore_proc_seq_next, | |
355 | .show = cio_ignore_proc_seq_show, | |
356 | }; | |
357 | ||
358 | static int | |
359 | cio_ignore_proc_open(struct inode *inode, struct file *file) | |
360 | { | |
361 | return seq_open(file, &cio_ignore_proc_seq_ops); | |
362 | } | |
363 | ||
d54b1fdb | 364 | static const struct file_operations cio_ignore_proc_fops = { |
678a395b CH |
365 | .open = cio_ignore_proc_open, |
366 | .read = seq_read, | |
367 | .llseek = seq_lseek, | |
368 | .release = seq_release, | |
369 | .write = cio_ignore_write, | |
370 | }; | |
371 | ||
1da177e4 LT |
372 | static int |
373 | cio_ignore_proc_init (void) | |
374 | { | |
375 | struct proc_dir_entry *entry; | |
376 | ||
377 | entry = create_proc_entry ("cio_ignore", S_IFREG | S_IRUGO | S_IWUSR, | |
378 | &proc_root); | |
379 | if (!entry) | |
a7fbf6bb | 380 | return -ENOENT; |
1da177e4 | 381 | |
678a395b | 382 | entry->proc_fops = &cio_ignore_proc_fops; |
1da177e4 | 383 | |
a7fbf6bb | 384 | return 0; |
1da177e4 LT |
385 | } |
386 | ||
387 | __initcall (cio_ignore_proc_init); | |
388 | ||
389 | #endif /* CONFIG_PROC_FS */ |