You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
112 lines
2.3 KiB
112 lines
2.3 KiB
/*
|
|
* drivers/s390/cio/idset.c
|
|
*
|
|
* Copyright IBM Corp. 2007
|
|
* Author(s): Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/bitops.h>
|
|
#include "idset.h"
|
|
#include "css.h"
|
|
|
|
struct idset {
|
|
int num_ssid;
|
|
int num_id;
|
|
unsigned long bitmap[0];
|
|
};
|
|
|
|
static inline unsigned long bitmap_size(int num_ssid, int num_id)
|
|
{
|
|
return __BITOPS_WORDS(num_ssid * num_id) * sizeof(unsigned long);
|
|
}
|
|
|
|
static struct idset *idset_new(int num_ssid, int num_id)
|
|
{
|
|
struct idset *set;
|
|
|
|
set = kzalloc(sizeof(struct idset) + bitmap_size(num_ssid, num_id),
|
|
GFP_KERNEL);
|
|
if (set) {
|
|
set->num_ssid = num_ssid;
|
|
set->num_id = num_id;
|
|
}
|
|
return set;
|
|
}
|
|
|
|
void idset_free(struct idset *set)
|
|
{
|
|
kfree(set);
|
|
}
|
|
|
|
void idset_clear(struct idset *set)
|
|
{
|
|
memset(set->bitmap, 0, bitmap_size(set->num_ssid, set->num_id));
|
|
}
|
|
|
|
void idset_fill(struct idset *set)
|
|
{
|
|
memset(set->bitmap, 0xff, bitmap_size(set->num_ssid, set->num_id));
|
|
}
|
|
|
|
static inline void idset_add(struct idset *set, int ssid, int id)
|
|
{
|
|
set_bit(ssid * set->num_id + id, set->bitmap);
|
|
}
|
|
|
|
static inline void idset_del(struct idset *set, int ssid, int id)
|
|
{
|
|
clear_bit(ssid * set->num_id + id, set->bitmap);
|
|
}
|
|
|
|
static inline int idset_contains(struct idset *set, int ssid, int id)
|
|
{
|
|
return test_bit(ssid * set->num_id + id, set->bitmap);
|
|
}
|
|
|
|
static inline int idset_get_first(struct idset *set, int *ssid, int *id)
|
|
{
|
|
int bitnum;
|
|
|
|
bitnum = find_first_bit(set->bitmap, set->num_ssid * set->num_id);
|
|
if (bitnum >= set->num_ssid * set->num_id)
|
|
return 0;
|
|
*ssid = bitnum / set->num_id;
|
|
*id = bitnum % set->num_id;
|
|
return 1;
|
|
}
|
|
|
|
struct idset *idset_sch_new(void)
|
|
{
|
|
return idset_new(__MAX_SSID + 1, __MAX_SUBCHANNEL + 1);
|
|
}
|
|
|
|
void idset_sch_add(struct idset *set, struct subchannel_id schid)
|
|
{
|
|
idset_add(set, schid.ssid, schid.sch_no);
|
|
}
|
|
|
|
void idset_sch_del(struct idset *set, struct subchannel_id schid)
|
|
{
|
|
idset_del(set, schid.ssid, schid.sch_no);
|
|
}
|
|
|
|
int idset_sch_contains(struct idset *set, struct subchannel_id schid)
|
|
{
|
|
return idset_contains(set, schid.ssid, schid.sch_no);
|
|
}
|
|
|
|
int idset_sch_get_first(struct idset *set, struct subchannel_id *schid)
|
|
{
|
|
int ssid = 0;
|
|
int id = 0;
|
|
int rc;
|
|
|
|
rc = idset_get_first(set, &ssid, &id);
|
|
if (rc) {
|
|
init_subchannel_id(schid);
|
|
schid->ssid = ssid;
|
|
schid->sch_no = id;
|
|
}
|
|
return rc;
|
|
}
|
|
|