5bdfcfcc07
Fix max channel check in cio_ignore display function. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
352 lines
8.2 KiB
C
352 lines
8.2 KiB
C
/*
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* drivers/s390/cio/blacklist.c
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* S/390 common I/O routines -- blacklisting of specific devices
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* $Revision: 1.34 $
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*
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* Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH,
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* IBM Corporation
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* Author(s): Ingo Adlung (adlung@de.ibm.com)
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* Cornelia Huck (cohuck@de.ibm.com)
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* Arnd Bergmann (arndb@de.ibm.com)
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*/
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#include <linux/config.h>
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#include <linux/init.h>
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#include <linux/vmalloc.h>
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#include <linux/slab.h>
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#include <linux/proc_fs.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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/*
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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 to indicate if a devno is blacklisted or not */
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#define __BL_DEV_WORDS (__MAX_SUBCHANNELS + (8*sizeof(long) - 1) / \
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(8*sizeof(long)))
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static unsigned long bl_dev[__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 inline void
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blacklist_range (range_action action, unsigned int from, unsigned int to)
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{
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if (!to)
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to = from;
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if (from > to || to > __MAX_SUBCHANNELS) {
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printk (KERN_WARNING "Invalid blacklist range "
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"0x%04x to 0x%04x, skipping\n", from, to);
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return;
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}
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for (; from <= to; from++) {
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if (action == add)
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set_bit (from, bl_dev);
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else
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clear_bit (from, bl_dev);
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}
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}
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/*
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* Function: blacklist_busid
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* Get devno/busid from given string.
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* Shamelessly grabbed from dasd_devmap.c.
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*/
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static inline int
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blacklist_busid(char **str, int *id0, int *id1, int *devno)
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{
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int val, old_style;
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char *sav;
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sav = *str;
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/* check for leading '0x' */
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old_style = 0;
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if ((*str)[0] == '0' && (*str)[1] == 'x') {
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*str += 2;
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old_style = 1;
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}
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if (!isxdigit((*str)[0])) /* We require at least one hex digit */
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goto confused;
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val = simple_strtoul(*str, str, 16);
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if (old_style || (*str)[0] != '.') {
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*id0 = *id1 = 0;
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if (val < 0 || val > 0xffff)
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goto confused;
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*devno = val;
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if ((*str)[0] != ',' && (*str)[0] != '-' &&
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(*str)[0] != '\n' && (*str)[0] != '\0')
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goto confused;
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return 0;
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}
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/* New style x.y.z busid */
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if (val < 0 || val > 0xff)
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goto confused;
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*id0 = val;
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(*str)++;
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if (!isxdigit((*str)[0])) /* We require at least one hex digit */
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goto confused;
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val = simple_strtoul(*str, str, 16);
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if (val < 0 || val > 0xff || (*str)++[0] != '.')
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goto confused;
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*id1 = val;
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if (!isxdigit((*str)[0])) /* We require at least one hex digit */
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goto confused;
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val = simple_strtoul(*str, str, 16);
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if (val < 0 || val > 0xffff)
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goto confused;
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*devno = val;
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if ((*str)[0] != ',' && (*str)[0] != '-' &&
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(*str)[0] != '\n' && (*str)[0] != '\0')
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goto confused;
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return 0;
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confused:
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strsep(str, ",\n");
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printk(KERN_WARNING "Invalid cio_ignore parameter '%s'\n", sav);
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return 1;
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}
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static inline int
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blacklist_parse_parameters (char *str, range_action action)
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{
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unsigned int from, to, from_id0, to_id0, from_id1, to_id1;
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while (*str != 0 && *str != '\n') {
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range_action ra = action;
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while(*str == ',')
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str++;
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if (*str == '!') {
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ra = !action;
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++str;
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}
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/*
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* Since we have to parse the proc commands and the
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* kernel arguments we have to check four cases
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*/
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if (strncmp(str,"all,",4) == 0 || strcmp(str,"all") == 0 ||
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strncmp(str,"all\n",4) == 0 || strncmp(str,"all ",4) == 0) {
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from = 0;
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to = __MAX_SUBCHANNELS;
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str += 3;
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} else {
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int rc;
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rc = blacklist_busid(&str, &from_id0,
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&from_id1, &from);
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if (rc)
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continue;
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to = from;
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to_id0 = from_id0;
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to_id1 = from_id1;
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if (*str == '-') {
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str++;
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rc = blacklist_busid(&str, &to_id0,
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&to_id1, &to);
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if (rc)
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continue;
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}
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if (*str == '-') {
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printk(KERN_WARNING "invalid cio_ignore "
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"parameter '%s'\n",
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strsep(&str, ",\n"));
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continue;
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}
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if ((from_id0 != to_id0) || (from_id1 != to_id1)) {
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printk(KERN_WARNING "invalid cio_ignore range "
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"%x.%x.%04x-%x.%x.%04x\n",
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from_id0, from_id1, from,
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to_id0, to_id1, to);
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continue;
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}
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}
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/* FIXME: ignoring id0 and id1 here. */
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pr_debug("blacklist_setup: adding range "
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"from 0.0.%04x to 0.0.%04x\n", from, to);
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blacklist_range (ra, from, to);
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}
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return 1;
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}
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/* Parsing the commandline for blacklist parameters, e.g. to blacklist
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* bus ids 0.0.1234, 0.0.1235 and 0.0.1236, you could use any of:
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* - cio_ignore=1234-1236
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* - cio_ignore=0x1234-0x1235,1236
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* - cio_ignore=0x1234,1235-1236
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* - cio_ignore=1236 cio_ignore=1234-0x1236
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* - cio_ignore=1234 cio_ignore=1236 cio_ignore=0x1235
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* - cio_ignore=0.0.1234-0.0.1236
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* - cio_ignore=0.0.1234,0x1235,1236
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* - ...
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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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return blacklist_parse_parameters (str, add);
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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 devno)
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{
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return test_bit (devno, bl_dev);
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}
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#ifdef CONFIG_PROC_FS
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/*
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* Function: s390_redo_validation
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* Look for no longer blacklisted devices
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* FIXME: there must be a better way to do this */
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static inline void
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s390_redo_validation (void)
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{
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unsigned int irq;
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CIO_TRACE_EVENT (0, "redoval");
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for (irq = 0; irq < __MAX_SUBCHANNELS; irq++) {
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int ret;
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struct subchannel *sch;
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sch = get_subchannel_by_schid(irq);
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if (sch) {
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/* Already known. */
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put_device(&sch->dev);
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continue;
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}
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ret = css_probe_device(irq);
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if (ret == -ENXIO)
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break; /* We're through. */
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if (ret == -ENOMEM)
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/*
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* Stop validation for now. Bad, but no need for a
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* panic.
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*/
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break;
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}
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}
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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 inline void
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blacklist_parse_proc_parameters (char *buf)
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{
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if (strncmp (buf, "free ", 5) == 0) {
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blacklist_parse_parameters (buf + 5, free);
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} else if (strncmp (buf, "add ", 4) == 0) {
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/*
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* We don't need to check for known devices since
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* css_probe_device will handle this correctly.
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*/
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blacklist_parse_parameters (buf + 4, add);
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} else {
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printk (KERN_WARNING "cio_ignore: Parse error; \n"
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KERN_WARNING "try using 'free all|<devno-range>,"
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"<devno-range>,...'\n"
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KERN_WARNING "or 'add <devno-range>,"
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"<devno-range>,...'\n");
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return;
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}
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s390_redo_validation ();
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}
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/* FIXME: These should be real bus ids and not home-grown ones! */
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static int cio_ignore_read (char *page, char **start, off_t off,
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int count, int *eof, void *data)
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{
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const unsigned int entry_size = 18; /* "0.0.ABCD-0.0.EFGH\n" */
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long devno;
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int len;
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len = 0;
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for (devno = off; /* abuse the page variable
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* as counter, see fs/proc/generic.c */
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devno < __MAX_SUBCHANNELS && len + entry_size < count; devno++) {
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if (!test_bit(devno, bl_dev))
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continue;
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len += sprintf(page + len, "0.0.%04lx", devno);
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if (test_bit(devno + 1, bl_dev)) { /* print range */
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while (++devno < __MAX_SUBCHANNELS)
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if (!test_bit(devno, bl_dev))
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break;
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len += sprintf(page + len, "-0.0.%04lx", --devno);
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}
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len += sprintf(page + len, "\n");
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}
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if (devno < __MAX_SUBCHANNELS)
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*eof = 1;
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*start = (char *) (devno - off); /* number of checked entries */
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return len;
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}
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static int cio_ignore_write(struct file *file, const char __user *user_buf,
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unsigned long user_len, void *data)
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{
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char *buf;
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if (user_len > 65536)
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user_len = 65536;
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buf = vmalloc (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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vfree (buf);
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return -EFAULT;
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}
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buf[user_len] = '\0';
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blacklist_parse_proc_parameters (buf);
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vfree (buf);
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return user_len;
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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 = create_proc_entry ("cio_ignore", S_IFREG | S_IRUGO | S_IWUSR,
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&proc_root);
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if (!entry)
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return 0;
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entry->read_proc = cio_ignore_read;
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entry->write_proc = cio_ignore_write;
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return 1;
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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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