idset.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 *    Copyright IBM Corp. 2007, 2012
  4 *    Author(s): Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
  5 */
  6
  7#include <linux/vmalloc.h>
  8#include <linux/bitmap.h>
  9#include <linux/bitops.h>
 10#include "idset.h"
 11#include "css.h"
 12
 13struct idset {
 14	int num_ssid;
 15	int num_id;
 16	unsigned long bitmap[];
 17};
 18
 19static inline unsigned long idset_bitmap_size(int num_ssid, int num_id)
 20{
 21	return bitmap_size(size_mul(num_ssid, num_id));
 22}
 23
 24static struct idset *idset_new(int num_ssid, int num_id)
 25{
 26	struct idset *set;
 27
 28	set = vmalloc(sizeof(struct idset) +
 29		      idset_bitmap_size(num_ssid, num_id));
 30	if (set) {
 31		set->num_ssid = num_ssid;
 32		set->num_id = num_id;
 33		memset(set->bitmap, 0, idset_bitmap_size(num_ssid, num_id));
 34	}
 35	return set;
 36}
 37
 38void idset_free(struct idset *set)
 39{
 40	vfree(set);
 41}
 42
 43void idset_fill(struct idset *set)
 44{
 45	memset(set->bitmap, 0xff,
 46	       idset_bitmap_size(set->num_ssid, set->num_id));
 47}
 48
 49static inline void idset_add(struct idset *set, int ssid, int id)
 50{
 51	set_bit(ssid * set->num_id + id, set->bitmap);
 52}
 53
 54static inline void idset_del(struct idset *set, int ssid, int id)
 55{
 56	clear_bit(ssid * set->num_id + id, set->bitmap);
 57}
 58
 59static inline int idset_contains(struct idset *set, int ssid, int id)
 60{
 61	return test_bit(ssid * set->num_id + id, set->bitmap);
 62}
 63
 64struct idset *idset_sch_new(void)
 65{
 66	return idset_new(max_ssid + 1, __MAX_SUBCHANNEL + 1);
 67}
 68
 69void idset_sch_add(struct idset *set, struct subchannel_id schid)
 70{
 71	idset_add(set, schid.ssid, schid.sch_no);
 72}
 73
 74void idset_sch_del(struct idset *set, struct subchannel_id schid)
 75{
 76	idset_del(set, schid.ssid, schid.sch_no);
 77}
 78
 79/* Clear ids starting from @schid up to end of subchannel set. */
 80void idset_sch_del_subseq(struct idset *set, struct subchannel_id schid)
 81{
 82	int pos = schid.ssid * set->num_id + schid.sch_no;
 83
 84	bitmap_clear(set->bitmap, pos, set->num_id - schid.sch_no);
 85}
 86
 87int idset_sch_contains(struct idset *set, struct subchannel_id schid)
 88{
 89	return idset_contains(set, schid.ssid, schid.sch_no);
 90}
 91
 92int idset_is_empty(struct idset *set)
 93{
 94	return bitmap_empty(set->bitmap, set->num_ssid * set->num_id);
 95}
 96
 97void idset_add_set(struct idset *to, struct idset *from)
 98{
 99	int len = min(to->num_ssid * to->num_id, from->num_ssid * from->num_id);
100
101	bitmap_or(to->bitmap, to->bitmap, from->bitmap, len);
102}