841 lines
20 KiB
C
841 lines
20 KiB
C
/*
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* File...........: linux/drivers/s390/block/dasd_devmap.c
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* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
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* Horst Hummel <Horst.Hummel@de.ibm.com>
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* Carsten Otte <Cotte@de.ibm.com>
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* Martin Schwidefsky <schwidefsky@de.ibm.com>
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* Bugreports.to..: <Linux390@de.ibm.com>
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* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
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*
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* Device mapping and dasd= parameter parsing functions. All devmap
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* functions may not be called from interrupt context. In particular
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* dasd_get_device is a no-no from interrupt context.
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*
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*/
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#include <linux/config.h>
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#include <linux/ctype.h>
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#include <linux/init.h>
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#include <asm/debug.h>
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#include <asm/uaccess.h>
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/* This is ugly... */
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#define PRINTK_HEADER "dasd_devmap:"
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#include "dasd_int.h"
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kmem_cache_t *dasd_page_cache;
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EXPORT_SYMBOL(dasd_page_cache);
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/*
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* dasd_devmap_t is used to store the features and the relation
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* between device number and device index. To find a dasd_devmap_t
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* that corresponds to a device number of a device index each
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* dasd_devmap_t is added to two linked lists, one to search by
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* the device number and one to search by the device index. As
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* soon as big minor numbers are available the device index list
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* can be removed since the device number will then be identical
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* to the device index.
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*/
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struct dasd_devmap {
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struct list_head list;
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char bus_id[BUS_ID_SIZE];
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unsigned int devindex;
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unsigned short features;
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struct dasd_device *device;
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};
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/*
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* Parameter parsing functions for dasd= parameter. The syntax is:
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* <devno> : (0x)?[0-9a-fA-F]+
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* <busid> : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+
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* <feature> : ro
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* <feature_list> : \(<feature>(:<feature>)*\)
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* <devno-range> : <devno>(-<devno>)?<feature_list>?
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* <busid-range> : <busid>(-<busid>)?<feature_list>?
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* <devices> : <devno-range>|<busid-range>
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* <dasd_module> : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod
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*
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* <dasd> : autodetect|probeonly|<devices>(,<devices>)*
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*/
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int dasd_probeonly = 0; /* is true, when probeonly mode is active */
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int dasd_autodetect = 0; /* is true, when autodetection is active */
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/*
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* char *dasd[] is intended to hold the ranges supplied by the dasd= statement
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* it is named 'dasd' to directly be filled by insmod with the comma separated
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* strings when running as a module.
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*/
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static char *dasd[256];
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/*
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* Single spinlock to protect devmap structures and lists.
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*/
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static DEFINE_SPINLOCK(dasd_devmap_lock);
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/*
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* Hash lists for devmap structures.
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*/
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static struct list_head dasd_hashlists[256];
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int dasd_max_devindex;
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static struct dasd_devmap *dasd_add_busid(char *, int);
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static inline int
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dasd_hash_busid(char *bus_id)
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{
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int hash, i;
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hash = 0;
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for (i = 0; (i < BUS_ID_SIZE) && *bus_id; i++, bus_id++)
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hash += *bus_id;
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return hash & 0xff;
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}
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#ifndef MODULE
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/*
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* The parameter parsing functions for builtin-drivers are called
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* before kmalloc works. Store the pointers to the parameters strings
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* into dasd[] for later processing.
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*/
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static int __init
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dasd_call_setup(char *str)
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{
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static int count = 0;
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if (count < 256)
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dasd[count++] = str;
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return 1;
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}
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__setup ("dasd=", dasd_call_setup);
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#endif /* #ifndef MODULE */
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/*
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* Read a device busid/devno from a string.
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*/
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static inline int
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dasd_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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/* 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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return -EINVAL;
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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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return -EINVAL;
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*devno = val;
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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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return -EINVAL;
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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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return -EINVAL;
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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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return -EINVAL;
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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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return -EINVAL;
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val = simple_strtoul(*str, str, 16);
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if (val < 0 || val > 0xffff)
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return -EINVAL;
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*devno = val;
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return 0;
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}
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/*
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* Read colon separated list of dasd features. Currently there is
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* only one: "ro" for read-only devices. The default feature set
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* is empty (value 0).
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*/
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static inline int
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dasd_feature_list(char *str, char **endp)
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{
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int features, len, rc;
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rc = 0;
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if (*str != '(') {
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*endp = str;
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return DASD_FEATURE_DEFAULT;
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}
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str++;
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features = 0;
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while (1) {
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for (len = 0;
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str[len] && str[len] != ':' && str[len] != ')'; len++);
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if (len == 2 && !strncmp(str, "ro", 2))
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features |= DASD_FEATURE_READONLY;
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else if (len == 4 && !strncmp(str, "diag", 4))
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features |= DASD_FEATURE_USEDIAG;
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else {
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MESSAGE(KERN_WARNING,
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"unsupported feature: %*s, "
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"ignoring setting", len, str);
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rc = -EINVAL;
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}
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str += len;
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if (*str != ':')
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break;
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str++;
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}
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if (*str != ')') {
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MESSAGE(KERN_WARNING, "%s",
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"missing ')' in dasd parameter string\n");
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rc = -EINVAL;
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} else
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str++;
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*endp = str;
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if (rc != 0)
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return rc;
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return features;
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}
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/*
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* Try to match the first element on the comma separated parse string
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* with one of the known keywords. If a keyword is found, take the approprate
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* action and return a pointer to the residual string. If the first element
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* could not be matched to any keyword then return an error code.
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*/
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static char *
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dasd_parse_keyword( char *parsestring ) {
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char *nextcomma, *residual_str;
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int length;
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nextcomma = strchr(parsestring,',');
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if (nextcomma) {
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length = nextcomma - parsestring;
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residual_str = nextcomma + 1;
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} else {
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length = strlen(parsestring);
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residual_str = parsestring + length;
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}
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if (strncmp ("autodetect", parsestring, length) == 0) {
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dasd_autodetect = 1;
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MESSAGE (KERN_INFO, "%s",
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"turning to autodetection mode");
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return residual_str;
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}
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if (strncmp ("probeonly", parsestring, length) == 0) {
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dasd_probeonly = 1;
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MESSAGE(KERN_INFO, "%s",
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"turning to probeonly mode");
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return residual_str;
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}
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if (strncmp ("fixedbuffers", parsestring, length) == 0) {
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if (dasd_page_cache)
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return residual_str;
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dasd_page_cache =
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kmem_cache_create("dasd_page_cache", PAGE_SIZE, 0,
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SLAB_CACHE_DMA, NULL, NULL );
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if (!dasd_page_cache)
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MESSAGE(KERN_WARNING, "%s", "Failed to create slab, "
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"fixed buffer mode disabled.");
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else
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MESSAGE (KERN_INFO, "%s",
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"turning on fixed buffer mode");
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return residual_str;
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}
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return ERR_PTR(-EINVAL);
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}
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/*
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* Try to interprete the first element on the comma separated parse string
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* as a device number or a range of devices. If the interpretation is
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* successfull, create the matching dasd_devmap entries and return a pointer
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* to the residual string.
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* If interpretation fails or in case of an error, return an error code.
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*/
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static char *
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dasd_parse_range( char *parsestring ) {
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struct dasd_devmap *devmap;
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int from, from_id0, from_id1;
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int to, to_id0, to_id1;
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int features, rc;
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char bus_id[BUS_ID_SIZE+1], *str;
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str = parsestring;
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rc = dasd_busid(&str, &from_id0, &from_id1, &from);
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if (rc == 0) {
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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 = dasd_busid(&str, &to_id0, &to_id1, &to);
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}
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}
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if (rc == 0 &&
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(from_id0 != to_id0 || from_id1 != to_id1 || from > to))
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rc = -EINVAL;
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if (rc) {
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MESSAGE(KERN_ERR, "Invalid device range %s", parsestring);
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return ERR_PTR(rc);
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}
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features = dasd_feature_list(str, &str);
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if (features < 0)
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return ERR_PTR(-EINVAL);
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while (from <= to) {
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sprintf(bus_id, "%01x.%01x.%04x",
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from_id0, from_id1, from++);
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devmap = dasd_add_busid(bus_id, features);
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if (IS_ERR(devmap))
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return (char *)devmap;
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}
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if (*str == ',')
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return str + 1;
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if (*str == '\0')
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return str;
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MESSAGE(KERN_WARNING,
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"junk at end of dasd parameter string: %s\n", str);
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return ERR_PTR(-EINVAL);
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}
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static inline char *
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dasd_parse_next_element( char *parsestring ) {
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char * residual_str;
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residual_str = dasd_parse_keyword(parsestring);
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if (!IS_ERR(residual_str))
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return residual_str;
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residual_str = dasd_parse_range(parsestring);
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return residual_str;
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}
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/*
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* Parse parameters stored in dasd[]
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* The 'dasd=...' parameter allows to specify a comma separated list of
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* keywords and device ranges. When the dasd driver is build into the kernel,
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* the complete list will be stored as one element of the dasd[] array.
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* When the dasd driver is build as a module, then the list is broken into
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* it's elements and each dasd[] entry contains one element.
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*/
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int
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dasd_parse(void)
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{
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int rc, i;
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char *parsestring;
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rc = 0;
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for (i = 0; i < 256; i++) {
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if (dasd[i] == NULL)
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break;
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parsestring = dasd[i];
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/* loop over the comma separated list in the parsestring */
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while (*parsestring) {
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parsestring = dasd_parse_next_element(parsestring);
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if(IS_ERR(parsestring)) {
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rc = PTR_ERR(parsestring);
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break;
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}
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}
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if (rc) {
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DBF_EVENT(DBF_ALERT, "%s", "invalid range found");
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break;
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}
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}
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return rc;
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}
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/*
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* Add a devmap for the device specified by busid. It is possible that
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* the devmap already exists (dasd= parameter). The order of the devices
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* added through this function will define the kdevs for the individual
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* devices.
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*/
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static struct dasd_devmap *
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dasd_add_busid(char *bus_id, int features)
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{
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struct dasd_devmap *devmap, *new, *tmp;
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int hash;
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new = (struct dasd_devmap *)
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kmalloc(sizeof(struct dasd_devmap), GFP_KERNEL);
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if (!new)
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return ERR_PTR(-ENOMEM);
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spin_lock(&dasd_devmap_lock);
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devmap = 0;
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hash = dasd_hash_busid(bus_id);
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list_for_each_entry(tmp, &dasd_hashlists[hash], list)
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if (strncmp(tmp->bus_id, bus_id, BUS_ID_SIZE) == 0) {
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devmap = tmp;
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break;
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}
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if (!devmap) {
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/* This bus_id is new. */
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new->devindex = dasd_max_devindex++;
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strncpy(new->bus_id, bus_id, BUS_ID_SIZE);
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new->features = features;
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new->device = 0;
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list_add(&new->list, &dasd_hashlists[hash]);
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devmap = new;
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new = 0;
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}
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spin_unlock(&dasd_devmap_lock);
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kfree(new);
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return devmap;
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}
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/*
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* Find devmap for device with given bus_id.
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*/
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static struct dasd_devmap *
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dasd_find_busid(char *bus_id)
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{
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struct dasd_devmap *devmap, *tmp;
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int hash;
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spin_lock(&dasd_devmap_lock);
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devmap = ERR_PTR(-ENODEV);
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hash = dasd_hash_busid(bus_id);
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list_for_each_entry(tmp, &dasd_hashlists[hash], list) {
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if (strncmp(tmp->bus_id, bus_id, BUS_ID_SIZE) == 0) {
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devmap = tmp;
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break;
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}
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}
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spin_unlock(&dasd_devmap_lock);
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return devmap;
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}
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/*
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* Check if busid has been added to the list of dasd ranges.
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*/
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int
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dasd_busid_known(char *bus_id)
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{
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return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0;
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}
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/*
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* Forget all about the device numbers added so far.
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* This may only be called at module unload or system shutdown.
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*/
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static void
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dasd_forget_ranges(void)
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{
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struct dasd_devmap *devmap, *n;
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int i;
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spin_lock(&dasd_devmap_lock);
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for (i = 0; i < 256; i++) {
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list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) {
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if (devmap->device != NULL)
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BUG();
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list_del(&devmap->list);
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kfree(devmap);
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}
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}
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spin_unlock(&dasd_devmap_lock);
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}
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/*
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* Find the device struct by its device index.
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*/
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struct dasd_device *
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dasd_device_from_devindex(int devindex)
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{
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struct dasd_devmap *devmap, *tmp;
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struct dasd_device *device;
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int i;
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spin_lock(&dasd_devmap_lock);
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devmap = 0;
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for (i = 0; (i < 256) && !devmap; i++)
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list_for_each_entry(tmp, &dasd_hashlists[i], list)
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if (tmp->devindex == devindex) {
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/* Found the devmap for the device. */
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devmap = tmp;
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break;
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}
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if (devmap && devmap->device) {
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device = devmap->device;
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dasd_get_device(device);
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} else
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device = ERR_PTR(-ENODEV);
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spin_unlock(&dasd_devmap_lock);
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return device;
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}
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/*
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* Return devmap for cdev. If no devmap exists yet, create one and
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* connect it to the cdev.
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*/
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static struct dasd_devmap *
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dasd_devmap_from_cdev(struct ccw_device *cdev)
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{
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struct dasd_devmap *devmap;
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devmap = dasd_find_busid(cdev->dev.bus_id);
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if (IS_ERR(devmap))
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devmap = dasd_add_busid(cdev->dev.bus_id,
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DASD_FEATURE_DEFAULT);
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return devmap;
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}
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/*
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* Create a dasd device structure for cdev.
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*/
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struct dasd_device *
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dasd_create_device(struct ccw_device *cdev)
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{
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struct dasd_devmap *devmap;
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struct dasd_device *device;
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int rc;
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devmap = dasd_devmap_from_cdev(cdev);
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if (IS_ERR(devmap))
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return (void *) devmap;
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cdev->dev.driver_data = devmap;
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device = dasd_alloc_device();
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if (IS_ERR(device))
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return device;
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atomic_set(&device->ref_count, 2);
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spin_lock(&dasd_devmap_lock);
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if (!devmap->device) {
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devmap->device = device;
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device->devindex = devmap->devindex;
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device->features = devmap->features;
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get_device(&cdev->dev);
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device->cdev = cdev;
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rc = 0;
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} else
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/* Someone else was faster. */
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rc = -EBUSY;
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spin_unlock(&dasd_devmap_lock);
|
|
|
|
if (rc) {
|
|
dasd_free_device(device);
|
|
return ERR_PTR(rc);
|
|
}
|
|
return device;
|
|
}
|
|
|
|
/*
|
|
* Wait queue for dasd_delete_device waits.
|
|
*/
|
|
static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq);
|
|
|
|
/*
|
|
* Remove a dasd device structure. The passed referenced
|
|
* is destroyed.
|
|
*/
|
|
void
|
|
dasd_delete_device(struct dasd_device *device)
|
|
{
|
|
struct ccw_device *cdev;
|
|
struct dasd_devmap *devmap;
|
|
|
|
/* First remove device pointer from devmap. */
|
|
devmap = dasd_find_busid(device->cdev->dev.bus_id);
|
|
if (IS_ERR(devmap))
|
|
BUG();
|
|
spin_lock(&dasd_devmap_lock);
|
|
if (devmap->device != device) {
|
|
spin_unlock(&dasd_devmap_lock);
|
|
dasd_put_device(device);
|
|
return;
|
|
}
|
|
devmap->device = NULL;
|
|
spin_unlock(&dasd_devmap_lock);
|
|
|
|
/* Drop ref_count by 2, one for the devmap reference and
|
|
* one for the passed reference. */
|
|
atomic_sub(2, &device->ref_count);
|
|
|
|
/* Wait for reference counter to drop to zero. */
|
|
wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0);
|
|
|
|
/* Disconnect dasd_device structure from ccw_device structure. */
|
|
cdev = device->cdev;
|
|
device->cdev = NULL;
|
|
|
|
/* Disconnect dasd_devmap structure from ccw_device structure. */
|
|
cdev->dev.driver_data = NULL;
|
|
|
|
/* Put ccw_device structure. */
|
|
put_device(&cdev->dev);
|
|
|
|
/* Now the device structure can be freed. */
|
|
dasd_free_device(device);
|
|
}
|
|
|
|
/*
|
|
* Reference counter dropped to zero. Wake up waiter
|
|
* in dasd_delete_device.
|
|
*/
|
|
void
|
|
dasd_put_device_wake(struct dasd_device *device)
|
|
{
|
|
wake_up(&dasd_delete_wq);
|
|
}
|
|
|
|
/*
|
|
* Return dasd_device structure associated with cdev.
|
|
*/
|
|
struct dasd_device *
|
|
dasd_device_from_cdev(struct ccw_device *cdev)
|
|
{
|
|
struct dasd_devmap *devmap;
|
|
struct dasd_device *device;
|
|
|
|
device = ERR_PTR(-ENODEV);
|
|
spin_lock(&dasd_devmap_lock);
|
|
devmap = cdev->dev.driver_data;
|
|
if (devmap && devmap->device) {
|
|
device = devmap->device;
|
|
dasd_get_device(device);
|
|
}
|
|
spin_unlock(&dasd_devmap_lock);
|
|
return device;
|
|
}
|
|
|
|
/*
|
|
* SECTION: files in sysfs
|
|
*/
|
|
|
|
/*
|
|
* readonly controls the readonly status of a dasd
|
|
*/
|
|
static ssize_t
|
|
dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct dasd_devmap *devmap;
|
|
int ro_flag;
|
|
|
|
devmap = dasd_find_busid(dev->bus_id);
|
|
if (!IS_ERR(devmap))
|
|
ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0;
|
|
else
|
|
ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0;
|
|
return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n");
|
|
}
|
|
|
|
static ssize_t
|
|
dasd_ro_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
struct dasd_devmap *devmap;
|
|
int ro_flag;
|
|
|
|
devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
|
|
if (IS_ERR(devmap))
|
|
return PTR_ERR(devmap);
|
|
ro_flag = buf[0] == '1';
|
|
spin_lock(&dasd_devmap_lock);
|
|
if (ro_flag)
|
|
devmap->features |= DASD_FEATURE_READONLY;
|
|
else
|
|
devmap->features &= ~DASD_FEATURE_READONLY;
|
|
if (devmap->device)
|
|
devmap->device->features = devmap->features;
|
|
if (devmap->device && devmap->device->gdp)
|
|
set_disk_ro(devmap->device->gdp, ro_flag);
|
|
spin_unlock(&dasd_devmap_lock);
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
|
|
|
|
/*
|
|
* use_diag controls whether the driver should use diag rather than ssch
|
|
* to talk to the device
|
|
*/
|
|
static ssize_t
|
|
dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct dasd_devmap *devmap;
|
|
int use_diag;
|
|
|
|
devmap = dasd_find_busid(dev->bus_id);
|
|
if (!IS_ERR(devmap))
|
|
use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0;
|
|
else
|
|
use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0;
|
|
return sprintf(buf, use_diag ? "1\n" : "0\n");
|
|
}
|
|
|
|
static ssize_t
|
|
dasd_use_diag_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
struct dasd_devmap *devmap;
|
|
ssize_t rc;
|
|
int use_diag;
|
|
|
|
devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
|
|
if (IS_ERR(devmap))
|
|
return PTR_ERR(devmap);
|
|
use_diag = buf[0] == '1';
|
|
spin_lock(&dasd_devmap_lock);
|
|
/* Changing diag discipline flag is only allowed in offline state. */
|
|
rc = count;
|
|
if (!devmap->device) {
|
|
if (use_diag)
|
|
devmap->features |= DASD_FEATURE_USEDIAG;
|
|
else
|
|
devmap->features &= ~DASD_FEATURE_USEDIAG;
|
|
} else
|
|
rc = -EPERM;
|
|
spin_unlock(&dasd_devmap_lock);
|
|
return rc;
|
|
}
|
|
|
|
static
|
|
DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store);
|
|
|
|
static ssize_t
|
|
dasd_discipline_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct dasd_devmap *devmap;
|
|
char *dname;
|
|
|
|
spin_lock(&dasd_devmap_lock);
|
|
dname = "none";
|
|
devmap = dev->driver_data;
|
|
if (devmap && devmap->device && devmap->device->discipline)
|
|
dname = devmap->device->discipline->name;
|
|
spin_unlock(&dasd_devmap_lock);
|
|
return snprintf(buf, PAGE_SIZE, "%s\n", dname);
|
|
}
|
|
|
|
static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
|
|
|
|
/*
|
|
* extended error-reporting
|
|
*/
|
|
static ssize_t
|
|
dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct dasd_devmap *devmap;
|
|
int eer_flag;
|
|
|
|
devmap = dasd_find_busid(dev->bus_id);
|
|
if (!IS_ERR(devmap) && devmap->device)
|
|
eer_flag = dasd_eer_enabled(devmap->device);
|
|
else
|
|
eer_flag = 0;
|
|
return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n");
|
|
}
|
|
|
|
static ssize_t
|
|
dasd_eer_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct dasd_devmap *devmap;
|
|
int rc;
|
|
|
|
devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
|
|
if (IS_ERR(devmap))
|
|
return PTR_ERR(devmap);
|
|
if (!devmap->device)
|
|
return count;
|
|
if (buf[0] == '1') {
|
|
rc = dasd_eer_enable(devmap->device);
|
|
if (rc)
|
|
return rc;
|
|
} else
|
|
dasd_eer_disable(devmap->device);
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
|
|
|
|
static struct attribute * dasd_attrs[] = {
|
|
&dev_attr_readonly.attr,
|
|
&dev_attr_discipline.attr,
|
|
&dev_attr_use_diag.attr,
|
|
&dev_attr_eer_enabled.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group dasd_attr_group = {
|
|
.attrs = dasd_attrs,
|
|
};
|
|
|
|
/*
|
|
* Return value of the specified feature.
|
|
*/
|
|
int
|
|
dasd_get_feature(struct ccw_device *cdev, int feature)
|
|
{
|
|
struct dasd_devmap *devmap;
|
|
|
|
devmap = dasd_find_busid(cdev->dev.bus_id);
|
|
if (IS_ERR(devmap))
|
|
return (int) PTR_ERR(devmap);
|
|
|
|
return ((devmap->features & feature) != 0);
|
|
}
|
|
|
|
/*
|
|
* Set / reset given feature.
|
|
* Flag indicates wether to set (!=0) or the reset (=0) the feature.
|
|
*/
|
|
int
|
|
dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
|
|
{
|
|
struct dasd_devmap *devmap;
|
|
|
|
devmap = dasd_find_busid(cdev->dev.bus_id);
|
|
if (IS_ERR(devmap))
|
|
return (int) PTR_ERR(devmap);
|
|
|
|
spin_lock(&dasd_devmap_lock);
|
|
if (flag)
|
|
devmap->features |= feature;
|
|
else
|
|
devmap->features &= ~feature;
|
|
if (devmap->device)
|
|
devmap->device->features = devmap->features;
|
|
spin_unlock(&dasd_devmap_lock);
|
|
return 0;
|
|
}
|
|
|
|
|
|
int
|
|
dasd_add_sysfs_files(struct ccw_device *cdev)
|
|
{
|
|
return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group);
|
|
}
|
|
|
|
void
|
|
dasd_remove_sysfs_files(struct ccw_device *cdev)
|
|
{
|
|
sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group);
|
|
}
|
|
|
|
|
|
int
|
|
dasd_devmap_init(void)
|
|
{
|
|
int i;
|
|
|
|
/* Initialize devmap structures. */
|
|
dasd_max_devindex = 0;
|
|
for (i = 0; i < 256; i++)
|
|
INIT_LIST_HEAD(&dasd_hashlists[i]);
|
|
return 0;
|
|
|
|
}
|
|
|
|
void
|
|
dasd_devmap_exit(void)
|
|
{
|
|
dasd_forget_ranges();
|
|
}
|