![Heiko Carstens](/assets/img/avatar_default.png)
Calculate correct size for bl_dev array. It should be 8KB instead of 512KB for 2^16 bits. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> 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
/*
|
|
* drivers/s390/cio/blacklist.c
|
|
* S/390 common I/O routines -- blacklisting of specific devices
|
|
* $Revision: 1.35 $
|
|
*
|
|
* Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH,
|
|
* IBM Corporation
|
|
* Author(s): Ingo Adlung (adlung@de.ibm.com)
|
|
* Cornelia Huck (cohuck@de.ibm.com)
|
|
* Arnd Bergmann (arndb@de.ibm.com)
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/init.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/device.h>
|
|
|
|
#include <asm/cio.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
#include "blacklist.h"
|
|
#include "cio.h"
|
|
#include "cio_debug.h"
|
|
#include "css.h"
|
|
|
|
/*
|
|
* "Blacklisting" of certain devices:
|
|
* Device numbers given in the commandline as cio_ignore=... won't be known
|
|
* to Linux.
|
|
*
|
|
* These can be single devices or ranges of devices
|
|
*/
|
|
|
|
/* 65536 bits to indicate if a devno is blacklisted or not */
|
|
#define __BL_DEV_WORDS ((__MAX_SUBCHANNELS + (8*sizeof(long) - 1)) / \
|
|
(8*sizeof(long)))
|
|
static unsigned long bl_dev[__BL_DEV_WORDS];
|
|
typedef enum {add, free} range_action;
|
|
|
|
/*
|
|
* Function: blacklist_range
|
|
* (Un-)blacklist the devices from-to
|
|
*/
|
|
static inline void
|
|
blacklist_range (range_action action, unsigned int from, unsigned int to)
|
|
{
|
|
if (!to)
|
|
to = from;
|
|
|
|
if (from > to || to > __MAX_SUBCHANNELS) {
|
|
printk (KERN_WARNING "Invalid blacklist range "
|
|
"0x%04x to 0x%04x, skipping\n", from, to);
|
|
return;
|
|
}
|
|
for (; from <= to; from++) {
|
|
if (action == add)
|
|
set_bit (from, bl_dev);
|
|
else
|
|
clear_bit (from, bl_dev);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Function: blacklist_busid
|
|
* Get devno/busid from given string.
|
|
* Shamelessly grabbed from dasd_devmap.c.
|
|
*/
|
|
static inline int
|
|
blacklist_busid(char **str, int *id0, int *id1, int *devno)
|
|
{
|
|
int val, old_style;
|
|
char *sav;
|
|
|
|
sav = *str;
|
|
|
|
/* check for leading '0x' */
|
|
old_style = 0;
|
|
if ((*str)[0] == '0' && (*str)[1] == 'x') {
|
|
*str += 2;
|
|
old_style = 1;
|
|
}
|
|
if (!isxdigit((*str)[0])) /* We require at least one hex digit */
|
|
goto confused;
|
|
val = simple_strtoul(*str, str, 16);
|
|
if (old_style || (*str)[0] != '.') {
|
|
*id0 = *id1 = 0;
|
|
if (val < 0 || val > 0xffff)
|
|
goto confused;
|
|
*devno = val;
|
|
if ((*str)[0] != ',' && (*str)[0] != '-' &&
|
|
(*str)[0] != '\n' && (*str)[0] != '\0')
|
|
goto confused;
|
|
return 0;
|
|
}
|
|
/* New style x.y.z busid */
|
|
if (val < 0 || val > 0xff)
|
|
goto confused;
|
|
*id0 = val;
|
|
(*str)++;
|
|
if (!isxdigit((*str)[0])) /* We require at least one hex digit */
|
|
goto confused;
|
|
val = simple_strtoul(*str, str, 16);
|
|
if (val < 0 || val > 0xff || (*str)++[0] != '.')
|
|
goto confused;
|
|
*id1 = val;
|
|
if (!isxdigit((*str)[0])) /* We require at least one hex digit */
|
|
goto confused;
|
|
val = simple_strtoul(*str, str, 16);
|
|
if (val < 0 || val > 0xffff)
|
|
goto confused;
|
|
*devno = val;
|
|
if ((*str)[0] != ',' && (*str)[0] != '-' &&
|
|
(*str)[0] != '\n' && (*str)[0] != '\0')
|
|
goto confused;
|
|
return 0;
|
|
confused:
|
|
strsep(str, ",\n");
|
|
printk(KERN_WARNING "Invalid cio_ignore parameter '%s'\n", sav);
|
|
return 1;
|
|
}
|
|
|
|
static inline int
|
|
blacklist_parse_parameters (char *str, range_action action)
|
|
{
|
|
unsigned int from, to, from_id0, to_id0, from_id1, to_id1;
|
|
|
|
while (*str != 0 && *str != '\n') {
|
|
range_action ra = action;
|
|
while(*str == ',')
|
|
str++;
|
|
if (*str == '!') {
|
|
ra = !action;
|
|
++str;
|
|
}
|
|
|
|
/*
|
|
* Since we have to parse the proc commands and the
|
|
* kernel arguments we have to check four cases
|
|
*/
|
|
if (strncmp(str,"all,",4) == 0 || strcmp(str,"all") == 0 ||
|
|
strncmp(str,"all\n",4) == 0 || strncmp(str,"all ",4) == 0) {
|
|
from = 0;
|
|
to = __MAX_SUBCHANNELS;
|
|
str += 3;
|
|
} else {
|
|
int rc;
|
|
|
|
rc = blacklist_busid(&str, &from_id0,
|
|
&from_id1, &from);
|
|
if (rc)
|
|
continue;
|
|
to = from;
|
|
to_id0 = from_id0;
|
|
to_id1 = from_id1;
|
|
if (*str == '-') {
|
|
str++;
|
|
rc = blacklist_busid(&str, &to_id0,
|
|
&to_id1, &to);
|
|
if (rc)
|
|
continue;
|
|
}
|
|
if (*str == '-') {
|
|
printk(KERN_WARNING "invalid cio_ignore "
|
|
"parameter '%s'\n",
|
|
strsep(&str, ",\n"));
|
|
continue;
|
|
}
|
|
if ((from_id0 != to_id0) || (from_id1 != to_id1)) {
|
|
printk(KERN_WARNING "invalid cio_ignore range "
|
|
"%x.%x.%04x-%x.%x.%04x\n",
|
|
from_id0, from_id1, from,
|
|
to_id0, to_id1, to);
|
|
continue;
|
|
}
|
|
}
|
|
/* FIXME: ignoring id0 and id1 here. */
|
|
pr_debug("blacklist_setup: adding range "
|
|
"from 0.0.%04x to 0.0.%04x\n", from, to);
|
|
blacklist_range (ra, from, to);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/* Parsing the commandline for blacklist parameters, e.g. to blacklist
|
|
* bus ids 0.0.1234, 0.0.1235 and 0.0.1236, you could use any of:
|
|
* - cio_ignore=1234-1236
|
|
* - cio_ignore=0x1234-0x1235,1236
|
|
* - cio_ignore=0x1234,1235-1236
|
|
* - cio_ignore=1236 cio_ignore=1234-0x1236
|
|
* - cio_ignore=1234 cio_ignore=1236 cio_ignore=0x1235
|
|
* - cio_ignore=0.0.1234-0.0.1236
|
|
* - cio_ignore=0.0.1234,0x1235,1236
|
|
* - ...
|
|
*/
|
|
static int __init
|
|
blacklist_setup (char *str)
|
|
{
|
|
CIO_MSG_EVENT(6, "Reading blacklist parameters\n");
|
|
return blacklist_parse_parameters (str, add);
|
|
}
|
|
|
|
__setup ("cio_ignore=", blacklist_setup);
|
|
|
|
/* Checking if devices are blacklisted */
|
|
|
|
/*
|
|
* Function: is_blacklisted
|
|
* Returns 1 if the given devicenumber can be found in the blacklist,
|
|
* otherwise 0.
|
|
* Used by validate_subchannel()
|
|
*/
|
|
int
|
|
is_blacklisted (int devno)
|
|
{
|
|
return test_bit (devno, bl_dev);
|
|
}
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
/*
|
|
* Function: s390_redo_validation
|
|
* Look for no longer blacklisted devices
|
|
* FIXME: there must be a better way to do this */
|
|
static inline void
|
|
s390_redo_validation (void)
|
|
{
|
|
unsigned int irq;
|
|
|
|
CIO_TRACE_EVENT (0, "redoval");
|
|
for (irq = 0; irq < __MAX_SUBCHANNELS; irq++) {
|
|
int ret;
|
|
struct subchannel *sch;
|
|
|
|
sch = get_subchannel_by_schid(irq);
|
|
if (sch) {
|
|
/* Already known. */
|
|
put_device(&sch->dev);
|
|
continue;
|
|
}
|
|
ret = css_probe_device(irq);
|
|
if (ret == -ENXIO)
|
|
break; /* We're through. */
|
|
if (ret == -ENOMEM)
|
|
/*
|
|
* Stop validation for now. Bad, but no need for a
|
|
* panic.
|
|
*/
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Function: blacklist_parse_proc_parameters
|
|
* parse the stuff which is piped to /proc/cio_ignore
|
|
*/
|
|
static inline void
|
|
blacklist_parse_proc_parameters (char *buf)
|
|
{
|
|
if (strncmp (buf, "free ", 5) == 0) {
|
|
blacklist_parse_parameters (buf + 5, free);
|
|
} else if (strncmp (buf, "add ", 4) == 0) {
|
|
/*
|
|
* We don't need to check for known devices since
|
|
* css_probe_device will handle this correctly.
|
|
*/
|
|
blacklist_parse_parameters (buf + 4, add);
|
|
} else {
|
|
printk (KERN_WARNING "cio_ignore: Parse error; \n"
|
|
KERN_WARNING "try using 'free all|<devno-range>,"
|
|
"<devno-range>,...'\n"
|
|
KERN_WARNING "or 'add <devno-range>,"
|
|
"<devno-range>,...'\n");
|
|
return;
|
|
}
|
|
|
|
s390_redo_validation ();
|
|
}
|
|
|
|
/* FIXME: These should be real bus ids and not home-grown ones! */
|
|
static int cio_ignore_read (char *page, char **start, off_t off,
|
|
int count, int *eof, void *data)
|
|
{
|
|
const unsigned int entry_size = 18; /* "0.0.ABCD-0.0.EFGH\n" */
|
|
long devno;
|
|
int len;
|
|
|
|
len = 0;
|
|
for (devno = off; /* abuse the page variable
|
|
* as counter, see fs/proc/generic.c */
|
|
devno < __MAX_SUBCHANNELS && len + entry_size < count; devno++) {
|
|
if (!test_bit(devno, bl_dev))
|
|
continue;
|
|
len += sprintf(page + len, "0.0.%04lx", devno);
|
|
if (test_bit(devno + 1, bl_dev)) { /* print range */
|
|
while (++devno < __MAX_SUBCHANNELS)
|
|
if (!test_bit(devno, bl_dev))
|
|
break;
|
|
len += sprintf(page + len, "-0.0.%04lx", --devno);
|
|
}
|
|
len += sprintf(page + len, "\n");
|
|
}
|
|
|
|
if (devno < __MAX_SUBCHANNELS)
|
|
*eof = 1;
|
|
*start = (char *) (devno - off); /* number of checked entries */
|
|
return len;
|
|
}
|
|
|
|
static int cio_ignore_write(struct file *file, const char __user *user_buf,
|
|
unsigned long user_len, void *data)
|
|
{
|
|
char *buf;
|
|
|
|
if (user_len > 65536)
|
|
user_len = 65536;
|
|
buf = vmalloc (user_len + 1); /* maybe better use the stack? */
|
|
if (buf == NULL)
|
|
return -ENOMEM;
|
|
if (strncpy_from_user (buf, user_buf, user_len) < 0) {
|
|
vfree (buf);
|
|
return -EFAULT;
|
|
}
|
|
buf[user_len] = '\0';
|
|
|
|
blacklist_parse_proc_parameters (buf);
|
|
|
|
vfree (buf);
|
|
return user_len;
|
|
}
|
|
|
|
static int
|
|
cio_ignore_proc_init (void)
|
|
{
|
|
struct proc_dir_entry *entry;
|
|
|
|
entry = create_proc_entry ("cio_ignore", S_IFREG | S_IRUGO | S_IWUSR,
|
|
&proc_root);
|
|
if (!entry)
|
|
return 0;
|
|
|
|
entry->read_proc = cio_ignore_read;
|
|
entry->write_proc = cio_ignore_write;
|
|
|
|
return 1;
|
|
}
|
|
|
|
__initcall (cio_ignore_proc_init);
|
|
|
|
#endif /* CONFIG_PROC_FS */
|