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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
266
267
268
269
270 css_schedule_eval_cond(CSS_EVAL_NOT_ONLINE, 0);
271 } else if (strcmp("add", parm) == 0)
272 rc = blacklist_parse_parameters(buf, add, 0);
273 else if (strcmp("purge", parm) == 0)
274 return ccw_purge_blacklisted();
275 else
276 return -EINVAL;
277
278
279 return rc;
280}
281
282
283struct ccwdev_iter {
284 int devno;
285 int ssid;
286 int in_range;
287};
288
289static void *
290cio_ignore_proc_seq_start(struct seq_file *s, loff_t *offset)
291{
292 struct ccwdev_iter *iter = s->private;
293
294 if (*offset >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1))
295 return NULL;
296 memset(iter, 0, sizeof(*iter));
297 iter->ssid = *offset / (__MAX_SUBCHANNEL + 1);
298 iter->devno = *offset % (__MAX_SUBCHANNEL + 1);
299 return iter;
300}
301
302static void
303cio_ignore_proc_seq_stop(struct seq_file *s, void *it)
304{
305}
306
307static void *
308cio_ignore_proc_seq_next(struct seq_file *s, void *it, loff_t *offset)
309{
310 struct ccwdev_iter *iter;
311 loff_t p = *offset;
312
313 (*offset)++;
314 if (p >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1))
315 return NULL;
316 iter = it;
317 if (iter->devno == __MAX_SUBCHANNEL) {
318 iter->devno = 0;
319 iter->ssid++;
320 if (iter->ssid > __MAX_SSID)
321 return NULL;
322 } else
323 iter->devno++;
324 return iter;
325}
326
327static int
328cio_ignore_proc_seq_show(struct seq_file *s, void *it)
329{
330 struct ccwdev_iter *iter;
331
332 iter = it;
333 if (!is_blacklisted(iter->ssid, iter->devno))
334
335 return 0;
336 if (!iter->in_range) {
337
338 if ((iter->devno == __MAX_SUBCHANNEL) ||
339 !is_blacklisted(iter->ssid, iter->devno + 1)) {
340
341 seq_printf(s, "0.%x.%04x\n", iter->ssid, iter->devno);
342 return 0;
343 }
344 iter->in_range = 1;
345 seq_printf(s, "0.%x.%04x-", iter->ssid, iter->devno);
346 return 0;
347 }
348 if ((iter->devno == __MAX_SUBCHANNEL) ||
349 !is_blacklisted(iter->ssid, iter->devno + 1)) {
350
351 iter->in_range = 0;
352 seq_printf(s, "0.%x.%04x\n", iter->ssid, iter->devno);
353 }
354 return 0;
355}
356
357static ssize_t
358cio_ignore_write(struct file *file, const char __user *user_buf,
359 size_t user_len, loff_t *offset)
360{
361 char *buf;
362 ssize_t rc, ret, i;
363
364 if (*offset)
365 return -EINVAL;
366 if (user_len > 65536)
367 user_len = 65536;
368 buf = vzalloc(user_len + 1);
369 if (buf == NULL)
370 return -ENOMEM;
371
372 if (strncpy_from_user (buf, user_buf, user_len) < 0) {
373 rc = -EFAULT;
374 goto out_free;
375 }
376
377 i = user_len - 1;
378 while ((i >= 0) && (isspace(buf[i]) || (buf[i] == 0))) {
379 buf[i] = '\0';
380 i--;
381 }
382 ret = blacklist_parse_proc_parameters(buf);
383 if (ret)
384 rc = ret;
385 else
386 rc = user_len;
387
388out_free:
389 vfree (buf);
390 return rc;
391}
392
393static const struct seq_operations cio_ignore_proc_seq_ops = {
394 .start = cio_ignore_proc_seq_start,
395 .stop = cio_ignore_proc_seq_stop,
396 .next = cio_ignore_proc_seq_next,
397 .show = cio_ignore_proc_seq_show,
398};
399
400static int
401cio_ignore_proc_open(struct inode *inode, struct file *file)
402{
403 return seq_open_private(file, &cio_ignore_proc_seq_ops,
404 sizeof(struct ccwdev_iter));
405}
406
407static const struct proc_ops cio_ignore_proc_ops = {
408 .proc_open = cio_ignore_proc_open,
409 .proc_read = seq_read,
410 .proc_lseek = seq_lseek,
411 .proc_release = seq_release_private,
412 .proc_write = cio_ignore_write,
413};
414
415static int
416cio_ignore_proc_init (void)
417{
418 struct proc_dir_entry *entry;
419
420 entry = proc_create("cio_ignore", S_IFREG | S_IRUGO | S_IWUSR, NULL,
421 &cio_ignore_proc_ops);
422 if (!entry)
423 return -ENOENT;
424 return 0;
425}
426
427__initcall (cio_ignore_proc_init);
428
429#endif
430
