2 * drivers/s390/cio/blacklist.c
3 * S/390 common I/O routines -- blacklisting of specific devices
5 * Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH,
7 * Author(s): Ingo Adlung (adlung@de.ibm.com)
8 * Cornelia Huck (cornelia.huck@de.ibm.com)
9 * Arnd Bergmann (arndb@de.ibm.com)
12 #include <linux/init.h>
13 #include <linux/vmalloc.h>
14 #include <linux/slab.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"
29 * "Blacklisting" of certain devices:
30 * Device numbers given in the commandline as cio_ignore=... won't be known
33 * These can be single devices or ranges of devices
36 /* 65536 bits for each set to indicate if a devno is blacklisted or not */
37 #define __BL_DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
39 static unsigned long bl_dev[__MAX_SSID + 1][__BL_DEV_WORDS];
40 typedef enum {add, free} range_action;
43 * Function: blacklist_range
44 * (Un-)blacklist the devices from-to
47 blacklist_range (range_action action, unsigned int from, unsigned int to,
53 if (from > to || to > __MAX_SUBCHANNEL || ssid > __MAX_SSID) {
54 printk (KERN_WARNING "cio: Invalid blacklist range "
55 "0.%x.%04x to 0.%x.%04x, skipping\n",
56 ssid, from, ssid, to);
59 for (; from <= to; from++) {
61 set_bit (from, bl_dev[ssid]);
63 clear_bit (from, bl_dev[ssid]);
68 * Function: blacklist_busid
69 * Get devno/busid from given string.
70 * Shamelessly grabbed from dasd_devmap.c.
73 blacklist_busid(char **str, int *id0, int *ssid, int *devno)
80 /* check for leading '0x' */
82 if ((*str)[0] == '0' && (*str)[1] == 'x') {
86 if (!isxdigit((*str)[0])) /* We require at least one hex digit */
88 val = simple_strtoul(*str, str, 16);
89 if (old_style || (*str)[0] != '.') {
91 if (val < 0 || val > 0xffff)
94 if ((*str)[0] != ',' && (*str)[0] != '-' &&
95 (*str)[0] != '\n' && (*str)[0] != '\0')
99 /* New style x.y.z busid */
100 if (val < 0 || val > 0xff)
104 if (!isxdigit((*str)[0])) /* We require at least one hex digit */
106 val = simple_strtoul(*str, str, 16);
107 if (val < 0 || val > 0xff || (*str)++[0] != '.')
110 if (!isxdigit((*str)[0])) /* We require at least one hex digit */
112 val = simple_strtoul(*str, str, 16);
113 if (val < 0 || val > 0xffff)
116 if ((*str)[0] != ',' && (*str)[0] != '-' &&
117 (*str)[0] != '\n' && (*str)[0] != '\0')
122 printk(KERN_WARNING "cio: Invalid cio_ignore parameter '%s'\n", sav);
127 blacklist_parse_parameters (char *str, range_action action)
129 int from, to, from_id0, to_id0, from_ssid, to_ssid;
131 while (*str != 0 && *str != '\n') {
132 range_action ra = action;
141 * Since we have to parse the proc commands and the
142 * kernel arguments we have to check four cases
144 if (strncmp(str,"all,",4) == 0 || strcmp(str,"all") == 0 ||
145 strncmp(str,"all\n",4) == 0 || strncmp(str,"all ",4) == 0) {
149 for (j=0; j <= __MAX_SSID; j++)
150 blacklist_range(ra, 0, __MAX_SUBCHANNEL, j);
154 rc = blacklist_busid(&str, &from_id0,
163 rc = blacklist_busid(&str, &to_id0,
169 printk(KERN_WARNING "cio: invalid cio_ignore "
171 strsep(&str, ",\n"));
174 if ((from_id0 != to_id0) ||
175 (from_ssid != to_ssid)) {
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);
182 blacklist_range (ra, from, to, to_ssid);
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
200 blacklist_setup (char *str)
202 return blacklist_parse_parameters (str, add);
205 __setup ("cio_ignore=", blacklist_setup);
207 /* Checking if devices are blacklisted */
210 * Function: is_blacklisted
211 * Returns 1 if the given devicenumber can be found in the blacklist,
213 * Used by validate_subchannel()
216 is_blacklisted (int ssid, int devno)
218 return test_bit (devno, bl_dev[ssid]);
221 #ifdef CONFIG_PROC_FS
223 * Function: blacklist_parse_proc_parameters
224 * parse the stuff which is piped to /proc/cio_ignore
227 blacklist_parse_proc_parameters (char *buf)
229 if (strncmp (buf, "free ", 5) == 0) {
230 blacklist_parse_parameters (buf + 5, free);
231 } else if (strncmp (buf, "add ", 4) == 0) {
233 * We don't need to check for known devices since
234 * css_probe_device will handle this correctly.
236 blacklist_parse_parameters (buf + 4, add);
238 printk (KERN_WARNING "cio: cio_ignore: Parse error; \n"
239 KERN_WARNING "try using 'free all|<devno-range>,"
240 "<devno-range>,...'\n"
241 KERN_WARNING "or 'add <devno-range>,"
242 "<devno-range>,...'\n");
246 css_schedule_reprobe();
249 /* Iterator struct for all devices. */
257 cio_ignore_proc_seq_start(struct seq_file *s, loff_t *offset)
259 struct ccwdev_iter *iter;
261 if (*offset >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1))
263 iter = kzalloc(sizeof(struct ccwdev_iter), GFP_KERNEL);
265 return ERR_PTR(-ENOMEM);
266 iter->ssid = *offset / (__MAX_SUBCHANNEL + 1);
267 iter->devno = *offset % (__MAX_SUBCHANNEL + 1);
272 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)
333 if (user_len > 65536)
335 buf = vmalloc (user_len + 1); /* maybe better use the stack? */
338 if (strncpy_from_user (buf, user_buf, user_len) < 0) {
342 buf[user_len] = '\0';
344 blacklist_parse_proc_parameters (buf);
350 static const struct seq_operations cio_ignore_proc_seq_ops = {
351 .start = cio_ignore_proc_seq_start,
352 .stop = cio_ignore_proc_seq_stop,
353 .next = cio_ignore_proc_seq_next,
354 .show = cio_ignore_proc_seq_show,
358 cio_ignore_proc_open(struct inode *inode, struct file *file)
360 return seq_open(file, &cio_ignore_proc_seq_ops);
363 static const struct file_operations cio_ignore_proc_fops = {
364 .open = cio_ignore_proc_open,
367 .release = seq_release,
368 .write = cio_ignore_write,
372 cio_ignore_proc_init (void)
374 struct proc_dir_entry *entry;
376 entry = proc_create("cio_ignore", S_IFREG | S_IRUGO | S_IWUSR, NULL,
377 &cio_ignore_proc_fops);
383 __initcall (cio_ignore_proc_init);
385 #endif /* CONFIG_PROC_FS */