133 lines
2.7 KiB
C
133 lines
2.7 KiB
C
/*
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* drivers/s390/cio/idset.c
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*
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* Copyright IBM Corp. 2007
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* Author(s): Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
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*/
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#include <linux/vmalloc.h>
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#include <linux/bitops.h>
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#include "idset.h"
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#include "css.h"
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struct idset {
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int num_ssid;
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int num_id;
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unsigned long bitmap[0];
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};
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static inline unsigned long bitmap_size(int num_ssid, int num_id)
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{
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return __BITOPS_WORDS(num_ssid * num_id) * sizeof(unsigned long);
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}
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static struct idset *idset_new(int num_ssid, int num_id)
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{
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struct idset *set;
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set = vmalloc(sizeof(struct idset) + bitmap_size(num_ssid, num_id));
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if (set) {
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set->num_ssid = num_ssid;
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set->num_id = num_id;
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memset(set->bitmap, 0, bitmap_size(num_ssid, num_id));
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}
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return set;
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}
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void idset_free(struct idset *set)
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{
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vfree(set);
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}
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void idset_clear(struct idset *set)
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{
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memset(set->bitmap, 0, bitmap_size(set->num_ssid, set->num_id));
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}
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void idset_fill(struct idset *set)
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{
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memset(set->bitmap, 0xff, bitmap_size(set->num_ssid, set->num_id));
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}
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static inline void idset_add(struct idset *set, int ssid, int id)
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{
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set_bit(ssid * set->num_id + id, set->bitmap);
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}
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static inline void idset_del(struct idset *set, int ssid, int id)
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{
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clear_bit(ssid * set->num_id + id, set->bitmap);
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}
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static inline int idset_contains(struct idset *set, int ssid, int id)
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{
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return test_bit(ssid * set->num_id + id, set->bitmap);
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}
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static inline int idset_get_first(struct idset *set, int *ssid, int *id)
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{
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int bitnum;
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bitnum = find_first_bit(set->bitmap, set->num_ssid * set->num_id);
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if (bitnum >= set->num_ssid * set->num_id)
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return 0;
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*ssid = bitnum / set->num_id;
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*id = bitnum % set->num_id;
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return 1;
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}
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struct idset *idset_sch_new(void)
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{
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return idset_new(max_ssid + 1, __MAX_SUBCHANNEL + 1);
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}
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void idset_sch_add(struct idset *set, struct subchannel_id schid)
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{
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idset_add(set, schid.ssid, schid.sch_no);
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}
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void idset_sch_del(struct idset *set, struct subchannel_id schid)
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{
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idset_del(set, schid.ssid, schid.sch_no);
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}
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int idset_sch_contains(struct idset *set, struct subchannel_id schid)
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{
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return idset_contains(set, schid.ssid, schid.sch_no);
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}
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int idset_sch_get_first(struct idset *set, struct subchannel_id *schid)
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{
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int ssid = 0;
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int id = 0;
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int rc;
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rc = idset_get_first(set, &ssid, &id);
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if (rc) {
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init_subchannel_id(schid);
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schid->ssid = ssid;
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schid->sch_no = id;
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}
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return rc;
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}
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int idset_is_empty(struct idset *set)
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{
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int bitnum;
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bitnum = find_first_bit(set->bitmap, set->num_ssid * set->num_id);
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if (bitnum >= set->num_ssid * set->num_id)
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return 1;
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return 0;
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}
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void idset_add_set(struct idset *to, struct idset *from)
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{
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unsigned long i, len;
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len = min(__BITOPS_WORDS(to->num_ssid * to->num_id),
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__BITOPS_WORDS(from->num_ssid * from->num_id));
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for (i = 0; i < len ; i++)
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to->bitmap[i] |= from->bitmap[i];
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}
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