2 * S/390 common I/O routines -- blacklisting of specific devices
4 * Copyright IBM Corp. 1999, 2002
5 * Author(s): Ingo Adlung (adlung@de.ibm.com)
6 * Cornelia Huck (cornelia.huck@de.ibm.com)
7 * Arnd Bergmann (arndb@de.ibm.com)
10 #define KMSG_COMPONENT "cio"
11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13 #include <linux/init.h>
14 #include <linux/vmalloc.h>
15 #include <linux/proc_fs.h>
16 #include <linux/seq_file.h>
17 #include <linux/ctype.h>
18 #include <linux/device.h>
21 #include <asm/uaccess.h>
23 #include "blacklist.h"
25 #include "cio_debug.h"
30 * "Blacklisting" of certain devices:
31 * Device numbers given in the commandline as cio_ignore=... won't be known
34 * These can be single devices or ranges of devices
37 /* 65536 bits for each set to indicate if a devno is blacklisted or not */
38 #define __BL_DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
40 static unsigned long bl_dev[__MAX_SSID + 1][__BL_DEV_WORDS];
41 typedef enum {add, free} range_action;
44 * Function: blacklist_range
45 * (Un-)blacklist the devices from-to
47 static int blacklist_range(range_action action, unsigned int from_ssid,
48 unsigned int to_ssid, unsigned int from,
49 unsigned int to, int msgtrigger)
51 if ((from_ssid > to_ssid) || ((from_ssid == to_ssid) && (from > to))) {
53 pr_warning("0.%x.%04x to 0.%x.%04x is not a valid "
54 "range for cio_ignore\n", from_ssid, from,
60 while ((from_ssid < to_ssid) || ((from_ssid == to_ssid) &&
63 set_bit(from, bl_dev[from_ssid]);
65 clear_bit(from, bl_dev[from_ssid]);
67 if (from > __MAX_SUBCHANNEL) {
76 static int pure_hex(char **cp, unsigned int *val, int min_digit,
77 int max_digit, int max_val)
84 while (diff <= max_digit) {
85 int value = hex_to_bin(**cp);
89 *val = *val * 16 + value;
94 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val))
100 static int parse_busid(char *str, unsigned int *cssid, unsigned int *ssid,
101 unsigned int *devno, int msgtrigger)
113 val = simple_strtoul(str, &str_work, 16);
115 if (*str_work == '\0') {
116 if (val <= __MAX_SUBCHANNEL) {
127 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID);
128 if (ret || (str_work[0] != '.'))
131 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID);
132 if (ret || (str_work[0] != '.'))
135 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL);
136 if (ret || (str_work[0] != '\0'))
141 if (rc && msgtrigger)
142 pr_warning("%s is not a valid device for the cio_ignore "
143 "kernel parameter\n", str);
148 static int blacklist_parse_parameters(char *str, range_action action,
151 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to;
158 while ((parm = strsep(&str, ","))) {
168 if (strcmp(parm, "all") == 0) {
172 to_cssid = __MAX_CSSID;
173 to_ssid = __MAX_SSID;
174 to = __MAX_SUBCHANNEL;
176 rc = parse_busid(strsep(&parm, "-"), &from_cssid,
177 &from_ssid, &from, msgtrigger);
180 rc = parse_busid(parm, &to_cssid,
184 to_cssid = from_cssid;
191 rc = blacklist_range(ra, from_ssid, to_ssid, from, to,
203 blacklist_setup (char *str)
205 CIO_MSG_EVENT(6, "Reading blacklist parameters\n");
206 if (blacklist_parse_parameters(str, add, 1))
211 __setup ("cio_ignore=", blacklist_setup);
213 /* Checking if devices are blacklisted */
216 * Function: is_blacklisted
217 * Returns 1 if the given devicenumber can be found in the blacklist,
219 * Used by validate_subchannel()
222 is_blacklisted (int ssid, int devno)
224 return test_bit (devno, bl_dev[ssid]);
227 #ifdef CONFIG_PROC_FS
229 * Function: blacklist_parse_proc_parameters
230 * parse the stuff which is piped to /proc/cio_ignore
232 static int blacklist_parse_proc_parameters(char *buf)
237 parm = strsep(&buf, " ");
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 if (strcmp("purge", parm) == 0)
244 return ccw_purge_blacklisted();
248 css_schedule_reprobe();
253 /* Iterator struct for all devices. */
261 cio_ignore_proc_seq_start(struct seq_file *s, loff_t *offset)
263 struct ccwdev_iter *iter = s->private;
265 if (*offset >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1))
267 memset(iter, 0, sizeof(*iter));
268 iter->ssid = *offset / (__MAX_SUBCHANNEL + 1);
269 iter->devno = *offset % (__MAX_SUBCHANNEL + 1);
274 cio_ignore_proc_seq_stop(struct seq_file *s, void *it)
279 cio_ignore_proc_seq_next(struct seq_file *s, void *it, loff_t *offset)
281 struct ccwdev_iter *iter;
283 if (*offset >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1))
286 if (iter->devno == __MAX_SUBCHANNEL) {
289 if (iter->ssid > __MAX_SSID)
298 cio_ignore_proc_seq_show(struct seq_file *s, void *it)
300 struct ccwdev_iter *iter;
303 if (!is_blacklisted(iter->ssid, iter->devno))
304 /* Not blacklisted, nothing to output. */
306 if (!iter->in_range) {
307 /* First device in range. */
308 if ((iter->devno == __MAX_SUBCHANNEL) ||
309 !is_blacklisted(iter->ssid, iter->devno + 1))
310 /* Singular device. */
311 return seq_printf(s, "0.%x.%04x\n",
312 iter->ssid, iter->devno);
314 return seq_printf(s, "0.%x.%04x-", iter->ssid, iter->devno);
316 if ((iter->devno == __MAX_SUBCHANNEL) ||
317 !is_blacklisted(iter->ssid, iter->devno + 1)) {
318 /* Last device in range. */
320 return seq_printf(s, "0.%x.%04x\n", iter->ssid, iter->devno);
326 cio_ignore_write(struct file *file, const char __user *user_buf,
327 size_t user_len, loff_t *offset)
334 if (user_len > 65536)
336 buf = vzalloc(user_len + 1); /* maybe better use the stack? */
340 if (strncpy_from_user (buf, user_buf, user_len) < 0) {
346 while ((i >= 0) && (isspace(buf[i]) || (buf[i] == 0))) {
350 ret = blacklist_parse_proc_parameters(buf);
361 static const struct seq_operations cio_ignore_proc_seq_ops = {
362 .start = cio_ignore_proc_seq_start,
363 .stop = cio_ignore_proc_seq_stop,
364 .next = cio_ignore_proc_seq_next,
365 .show = cio_ignore_proc_seq_show,
369 cio_ignore_proc_open(struct inode *inode, struct file *file)
371 return seq_open_private(file, &cio_ignore_proc_seq_ops,
372 sizeof(struct ccwdev_iter));
375 static const struct file_operations cio_ignore_proc_fops = {
376 .open = cio_ignore_proc_open,
379 .release = seq_release_private,
380 .write = cio_ignore_write,
384 cio_ignore_proc_init (void)
386 struct proc_dir_entry *entry;
388 entry = proc_create("cio_ignore", S_IFREG | S_IRUGO | S_IWUSR, NULL,
389 &cio_ignore_proc_fops);
395 __initcall (cio_ignore_proc_init);
397 #endif /* CONFIG_PROC_FS */