![Heiko Carstens](/assets/img/avatar_default.png)
Remove the file name from the comment at top of many files. In most cases the file name was wrong anyway, so it's rather pointless. Also unify the IBM copyright statement. We did have a lot of sightly different statements and wanted to change them one after another whenever a file gets touched. However that never happened. Instead people start to take the old/"wrong" statements to use as a template for new files. So unify all of them in one go. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
398 lines
8.2 KiB
C
398 lines
8.2 KiB
C
/*
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* S/390 common I/O routines -- blacklisting of specific devices
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*
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* Copyright IBM Corp. 1999, 2002
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* Author(s): Ingo Adlung (adlung@de.ibm.com)
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* Cornelia Huck (cornelia.huck@de.ibm.com)
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* Arnd Bergmann (arndb@de.ibm.com)
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*/
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#define KMSG_COMPONENT "cio"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/init.h>
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#include <linux/vmalloc.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/ctype.h>
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#include <linux/device.h>
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#include <asm/cio.h>
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#include <asm/uaccess.h>
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#include "blacklist.h"
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#include "cio.h"
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#include "cio_debug.h"
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#include "css.h"
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#include "device.h"
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/*
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* "Blacklisting" of certain devices:
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* Device numbers given in the commandline as cio_ignore=... won't be known
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* to Linux.
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*
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* These can be single devices or ranges of devices
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*/
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/* 65536 bits for each set to indicate if a devno is blacklisted or not */
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#define __BL_DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
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(8*sizeof(long)))
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static unsigned long bl_dev[__MAX_SSID + 1][__BL_DEV_WORDS];
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typedef enum {add, free} range_action;
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/*
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* Function: blacklist_range
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* (Un-)blacklist the devices from-to
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*/
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static int blacklist_range(range_action action, unsigned int from_ssid,
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unsigned int to_ssid, unsigned int from,
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unsigned int to, int msgtrigger)
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{
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if ((from_ssid > to_ssid) || ((from_ssid == to_ssid) && (from > to))) {
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if (msgtrigger)
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pr_warning("0.%x.%04x to 0.%x.%04x is not a valid "
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"range for cio_ignore\n", from_ssid, from,
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to_ssid, to);
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return 1;
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}
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while ((from_ssid < to_ssid) || ((from_ssid == to_ssid) &&
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(from <= to))) {
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if (action == add)
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set_bit(from, bl_dev[from_ssid]);
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else
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clear_bit(from, bl_dev[from_ssid]);
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from++;
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if (from > __MAX_SUBCHANNEL) {
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from_ssid++;
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from = 0;
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}
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}
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return 0;
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}
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static int pure_hex(char **cp, unsigned int *val, int min_digit,
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int max_digit, int max_val)
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{
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int diff;
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diff = 0;
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*val = 0;
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while (diff <= max_digit) {
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int value = hex_to_bin(**cp);
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if (value < 0)
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break;
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*val = *val * 16 + value;
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(*cp)++;
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diff++;
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}
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if ((diff < min_digit) || (diff > max_digit) || (*val > max_val))
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return 1;
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return 0;
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}
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static int parse_busid(char *str, unsigned int *cssid, unsigned int *ssid,
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unsigned int *devno, int msgtrigger)
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{
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char *str_work;
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int val, rc, ret;
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rc = 1;
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if (*str == '\0')
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goto out;
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/* old style */
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str_work = str;
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val = simple_strtoul(str, &str_work, 16);
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if (*str_work == '\0') {
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if (val <= __MAX_SUBCHANNEL) {
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*devno = val;
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*ssid = 0;
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*cssid = 0;
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rc = 0;
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}
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goto out;
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}
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/* new style */
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str_work = str;
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ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID);
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if (ret || (str_work[0] != '.'))
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goto out;
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str_work++;
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ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID);
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if (ret || (str_work[0] != '.'))
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goto out;
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str_work++;
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ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL);
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if (ret || (str_work[0] != '\0'))
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goto out;
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rc = 0;
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out:
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if (rc && msgtrigger)
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pr_warning("%s is not a valid device for the cio_ignore "
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"kernel parameter\n", str);
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return rc;
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}
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static int blacklist_parse_parameters(char *str, range_action action,
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int msgtrigger)
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{
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unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to;
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int rc, totalrc;
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char *parm;
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range_action ra;
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totalrc = 0;
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while ((parm = strsep(&str, ","))) {
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rc = 0;
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ra = action;
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if (*parm == '!') {
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if (ra == add)
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ra = free;
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else
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ra = add;
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parm++;
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}
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if (strcmp(parm, "all") == 0) {
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from_cssid = 0;
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from_ssid = 0;
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from = 0;
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to_cssid = __MAX_CSSID;
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to_ssid = __MAX_SSID;
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to = __MAX_SUBCHANNEL;
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} else {
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rc = parse_busid(strsep(&parm, "-"), &from_cssid,
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&from_ssid, &from, msgtrigger);
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if (!rc) {
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if (parm != NULL)
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rc = parse_busid(parm, &to_cssid,
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&to_ssid, &to,
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msgtrigger);
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else {
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to_cssid = from_cssid;
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to_ssid = from_ssid;
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to = from;
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}
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}
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}
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if (!rc) {
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rc = blacklist_range(ra, from_ssid, to_ssid, from, to,
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msgtrigger);
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if (rc)
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totalrc = -EINVAL;
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} else
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totalrc = -EINVAL;
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}
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return totalrc;
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}
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static int __init
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blacklist_setup (char *str)
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{
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CIO_MSG_EVENT(6, "Reading blacklist parameters\n");
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if (blacklist_parse_parameters(str, add, 1))
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return 0;
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return 1;
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}
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__setup ("cio_ignore=", blacklist_setup);
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/* Checking if devices are blacklisted */
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/*
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* Function: is_blacklisted
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* Returns 1 if the given devicenumber can be found in the blacklist,
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* otherwise 0.
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* Used by validate_subchannel()
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*/
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int
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is_blacklisted (int ssid, int devno)
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{
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return test_bit (devno, bl_dev[ssid]);
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}
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#ifdef CONFIG_PROC_FS
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/*
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* Function: blacklist_parse_proc_parameters
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* parse the stuff which is piped to /proc/cio_ignore
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*/
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static int blacklist_parse_proc_parameters(char *buf)
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{
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int rc;
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char *parm;
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parm = strsep(&buf, " ");
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if (strcmp("free", parm) == 0)
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rc = blacklist_parse_parameters(buf, free, 0);
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else if (strcmp("add", parm) == 0)
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rc = blacklist_parse_parameters(buf, add, 0);
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else if (strcmp("purge", parm) == 0)
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return ccw_purge_blacklisted();
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else
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return -EINVAL;
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css_schedule_reprobe();
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return rc;
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}
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/* Iterator struct for all devices. */
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struct ccwdev_iter {
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int devno;
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int ssid;
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int in_range;
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};
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static void *
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cio_ignore_proc_seq_start(struct seq_file *s, loff_t *offset)
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{
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struct ccwdev_iter *iter = s->private;
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if (*offset >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1))
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return NULL;
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memset(iter, 0, sizeof(*iter));
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iter->ssid = *offset / (__MAX_SUBCHANNEL + 1);
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iter->devno = *offset % (__MAX_SUBCHANNEL + 1);
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return iter;
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}
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static void
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cio_ignore_proc_seq_stop(struct seq_file *s, void *it)
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{
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}
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static void *
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cio_ignore_proc_seq_next(struct seq_file *s, void *it, loff_t *offset)
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{
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struct ccwdev_iter *iter;
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if (*offset >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1))
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return NULL;
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iter = it;
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if (iter->devno == __MAX_SUBCHANNEL) {
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iter->devno = 0;
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iter->ssid++;
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if (iter->ssid > __MAX_SSID)
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return NULL;
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} else
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iter->devno++;
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(*offset)++;
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return iter;
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}
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static int
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cio_ignore_proc_seq_show(struct seq_file *s, void *it)
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{
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struct ccwdev_iter *iter;
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iter = it;
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if (!is_blacklisted(iter->ssid, iter->devno))
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/* Not blacklisted, nothing to output. */
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return 0;
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if (!iter->in_range) {
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/* First device in range. */
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if ((iter->devno == __MAX_SUBCHANNEL) ||
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!is_blacklisted(iter->ssid, iter->devno + 1))
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/* Singular device. */
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return seq_printf(s, "0.%x.%04x\n",
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iter->ssid, iter->devno);
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iter->in_range = 1;
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return seq_printf(s, "0.%x.%04x-", iter->ssid, iter->devno);
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}
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if ((iter->devno == __MAX_SUBCHANNEL) ||
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!is_blacklisted(iter->ssid, iter->devno + 1)) {
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/* Last device in range. */
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iter->in_range = 0;
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return seq_printf(s, "0.%x.%04x\n", iter->ssid, iter->devno);
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}
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return 0;
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}
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static ssize_t
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cio_ignore_write(struct file *file, const char __user *user_buf,
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size_t user_len, loff_t *offset)
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{
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char *buf;
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ssize_t rc, ret, i;
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if (*offset)
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return -EINVAL;
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if (user_len > 65536)
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user_len = 65536;
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buf = vzalloc(user_len + 1); /* maybe better use the stack? */
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if (buf == NULL)
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return -ENOMEM;
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if (strncpy_from_user (buf, user_buf, user_len) < 0) {
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rc = -EFAULT;
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goto out_free;
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}
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i = user_len - 1;
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while ((i >= 0) && (isspace(buf[i]) || (buf[i] == 0))) {
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buf[i] = '\0';
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i--;
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}
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ret = blacklist_parse_proc_parameters(buf);
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if (ret)
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rc = ret;
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else
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rc = user_len;
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out_free:
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vfree (buf);
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return rc;
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}
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static const struct seq_operations cio_ignore_proc_seq_ops = {
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.start = cio_ignore_proc_seq_start,
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.stop = cio_ignore_proc_seq_stop,
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.next = cio_ignore_proc_seq_next,
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.show = cio_ignore_proc_seq_show,
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};
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static int
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cio_ignore_proc_open(struct inode *inode, struct file *file)
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{
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return seq_open_private(file, &cio_ignore_proc_seq_ops,
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sizeof(struct ccwdev_iter));
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}
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static const struct file_operations cio_ignore_proc_fops = {
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.open = cio_ignore_proc_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release_private,
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.write = cio_ignore_write,
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};
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static int
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cio_ignore_proc_init (void)
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{
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struct proc_dir_entry *entry;
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entry = proc_create("cio_ignore", S_IFREG | S_IRUGO | S_IWUSR, NULL,
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&cio_ignore_proc_fops);
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if (!entry)
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return -ENOENT;
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return 0;
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}
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__initcall (cio_ignore_proc_init);
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#endif /* CONFIG_PROC_FS */
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