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/*
* 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;
}
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