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11#define KMSG_COMPONENT "cio"
12#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13
14#include <linux/init.h>
15#include <linux/vmalloc.h>
16#include <linux/proc_fs.h>
17#include <linux/seq_file.h>
18#include <linux/ctype.h>
19#include <linux/device.h>
20
21#include <linux/uaccess.h>
22#include <asm/cio.h>
23#include <asm/ipl.h>
24
25#include "blacklist.h"
26#include "cio.h"
27#include "cio_debug.h"
28#include "css.h"
29#include "device.h"
30
31
32
33
34
35
36
37
38
39
40#define __BL_DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
41 (8*sizeof(long)))
42static unsigned long bl_dev[__MAX_SSID + 1][__BL_DEV_WORDS];
43typedef enum {add, free} range_action;
44
45
46
47
48
49static int blacklist_range(range_action action, unsigned int from_ssid,
50 unsigned int to_ssid, unsigned int from,
51 unsigned int to, int msgtrigger)
52{
53 if ((from_ssid > to_ssid) || ((from_ssid == to_ssid) && (from > to))) {
54 if (msgtrigger)
55 pr_warn("0.%x.%04x to 0.%x.%04x is not a valid range for cio_ignore\n",
56 from_ssid, from, to_ssid, to);
57
58 return 1;
59 }
60
61 while ((from_ssid < to_ssid) || ((from_ssid == to_ssid) &&
62 (from <= to))) {
63 if (action == add)
64 set_bit(from, bl_dev[from_ssid]);
65 else
66 clear_bit(from, bl_dev[from_ssid]);
67 from++;
68 if (from > __MAX_SUBCHANNEL) {
69 from_ssid++;
70 from = 0;
71 }
72 }
73
74 return 0;
75}
76
77static int pure_hex(char **cp, unsigned int *val, int min_digit,
78 int max_digit, int max_val)
79{
80 int diff;
81
82 diff = 0;
83 *val = 0;
84
85 while (diff <= max_digit) {
86 int value = hex_to_bin(**cp);
87
88 if (value < 0)
89 break;
90 *val = *val * 16 + value;
91 (*cp)++;
92 diff++;
93 }
94
95 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val))
96 return 1;
97
98 return 0;
99}
100
101static int parse_busid(char *str, unsigned int *cssid, unsigned int *ssid,
102 unsigned int *devno, int msgtrigger)
103{
104 char *str_work;
105 int val, rc, ret;
106
107 rc = 1;
108
109 if (*str == '\0')
110 goto out;
111
112
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;
122 }
123 goto out;
124 }
125
126
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;
141out:
142 if (rc && msgtrigger)
143 pr_warn("%s is not a valid device for the cio_ignore kernel parameter\n",
144 str);
145
146 return rc;
147}
148
149static int blacklist_parse_parameters(char *str, range_action action,
150 int msgtrigger)
151{
152 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to;
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;
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;
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;
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 }
212 }
213 }
214 if (!rc) {
215 rc = blacklist_range(ra, from_ssid, to_ssid, from, to,
216 msgtrigger);
217 if (rc)
218 totalrc = -EINVAL;
219 } else
220 totalrc = -EINVAL;
221 }
222
223 return totalrc;
224}
225
226static int __init
227blacklist_setup (char *str)
228{
229 CIO_MSG_EVENT(6, "Reading blacklist parameters\n");
230 if (blacklist_parse_parameters(str, add, 1))
231 return 0;
232 return 1;
233}
234
235__setup ("cio_ignore=", blacklist_setup);
236
237
238
239
240
241
242
243
244
245int
246is_blacklisted (int ssid, int devno)
247{
248 return test_bit (devno, bl_dev[ssid]);
249}
250
251#ifdef CONFIG_PROC_FS
252
253
254
255
256static int blacklist_parse_proc_parameters(char *buf)
257{
258 int rc;
259 char *parm;
260
261 parm = strsep(&buf, " ");
262
263 if (strcmp("free", parm) == 0) {
264 rc = blacklist_parse_parameters(buf, free, 0);
265 css_schedule_eval_all_unreg(0);
266 } else if (strcmp("add", parm) == 0)
267 rc = blacklist_parse_parameters(buf, add, 0);
268 else if (strcmp("purge", parm) == 0)
269 return ccw_purge_blacklisted();
270 else
271 return -EINVAL;
272
273
274 return rc;
275}
276
277
278struct ccwdev_iter {
279 int devno;
280 int ssid;
281 int in_range;
282};
283
284static void *
285cio_ignore_proc_seq_start(struct seq_file *s, loff_t *offset)
286{
287 struct ccwdev_iter *iter = s->private;
288
289 if (*offset >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1))
290 return NULL;
291 memset(iter, 0, sizeof(*iter));
292 iter->ssid = *offset / (__MAX_SUBCHANNEL + 1);
293 iter->devno = *offset % (__MAX_SUBCHANNEL + 1);
294 return iter;
295}
296
297static void
298cio_ignore_proc_seq_stop(struct seq_file *s, void *it)
299{
300}
301
302static void *
303cio_ignore_proc_seq_next(struct seq_file *s, void *it, loff_t *offset)
304{
305 struct ccwdev_iter *iter;
306 loff_t p = *offset;
307
308 (*offset)++;
309 if (p >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1))
310 return NULL;
311 iter = it;
312 if (iter->devno == __MAX_SUBCHANNEL) {
313 iter->devno = 0;
314 iter->ssid++;
315 if (iter->ssid > __MAX_SSID)
316 return NULL;
317 } else
318 iter->devno++;
319 return iter;
320}
321
322static int
323cio_ignore_proc_seq_show(struct seq_file *s, void *it)
324{
325 struct ccwdev_iter *iter;
326
327 iter = it;
328 if (!is_blacklisted(iter->ssid, iter->devno))
329
330 return 0;
331 if (!iter->in_range) {
332
333 if ((iter->devno == __MAX_SUBCHANNEL) ||
334 !is_blacklisted(iter->ssid, iter->devno + 1)) {
335
336 seq_printf(s, "0.%x.%04x\n", iter->ssid, iter->devno);
337 return 0;
338 }
339 iter->in_range = 1;
340 seq_printf(s, "0.%x.%04x-", iter->ssid, iter->devno);
341 return 0;
342 }
343 if ((iter->devno == __MAX_SUBCHANNEL) ||
344 !is_blacklisted(iter->ssid, iter->devno + 1)) {
345
346 iter->in_range = 0;
347 seq_printf(s, "0.%x.%04x\n", iter->ssid, iter->devno);
348 }
349 return 0;
350}
351
352static ssize_t
353cio_ignore_write(struct file *file, const char __user *user_buf,
354 size_t user_len, loff_t *offset)
355{
356 char *buf;
357 ssize_t rc, ret, i;
358
359 if (*offset)
360 return -EINVAL;
361 if (user_len > 65536)
362 user_len = 65536;
363 buf = vzalloc(user_len + 1);
364 if (buf == NULL)
365 return -ENOMEM;
366
367 if (strncpy_from_user (buf, user_buf, user_len) < 0) {
368 rc = -EFAULT;
369 goto out_free;
370 }
371
372 i = user_len - 1;
373 while ((i >= 0) && (isspace(buf[i]) || (buf[i] == 0))) {
374 buf[i] = '\0';
375 i--;
376 }
377 ret = blacklist_parse_proc_parameters(buf);
378 if (ret)
379 rc = ret;
380 else
381 rc = user_len;
382
383out_free:
384 vfree (buf);
385 return rc;
386}
387
388static const struct seq_operations cio_ignore_proc_seq_ops = {
389 .start = cio_ignore_proc_seq_start,
390 .stop = cio_ignore_proc_seq_stop,
391 .next = cio_ignore_proc_seq_next,
392 .show = cio_ignore_proc_seq_show,
393};
394
395static int
396cio_ignore_proc_open(struct inode *inode, struct file *file)
397{
398 return seq_open_private(file, &cio_ignore_proc_seq_ops,
399 sizeof(struct ccwdev_iter));
400}
401
402static const struct proc_ops cio_ignore_proc_ops = {
403 .proc_open = cio_ignore_proc_open,
404 .proc_read = seq_read,
405 .proc_lseek = seq_lseek,
406 .proc_release = seq_release_private,
407 .proc_write = cio_ignore_write,
408};
409
410static int
411cio_ignore_proc_init (void)
412{
413 struct proc_dir_entry *entry;
414
415 entry = proc_create("cio_ignore", S_IFREG | S_IRUGO | S_IWUSR, NULL,
416 &cio_ignore_proc_ops);
417 if (!entry)
418 return -ENOENT;
419 return 0;
420}
421
422__initcall (cio_ignore_proc_init);
423
424#endif
425
