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- /*
- * Copyright IBM Corp. 2007, 2012
- * Author(s): Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
- */
- #include <linux/vmalloc.h>
- #include <linux/bitmap.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 BITS_TO_LONGS(num_ssid * num_id) * sizeof(unsigned long);
- }
- static struct idset *idset_new(int num_ssid, int num_id)
- {
- struct idset *set;
- set = vmalloc(sizeof(struct idset) + bitmap_size(num_ssid, num_id));
- if (set) {
- set->num_ssid = num_ssid;
- set->num_id = num_id;
- memset(set->bitmap, 0, bitmap_size(num_ssid, num_id));
- }
- return set;
- }
- void idset_free(struct idset *set)
- {
- vfree(set);
- }
- 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);
- }
- /* Clear ids starting from @schid up to end of subchannel set. */
- void idset_sch_del_subseq(struct idset *set, struct subchannel_id schid)
- {
- int pos = schid.ssid * set->num_id + schid.sch_no;
- bitmap_clear(set->bitmap, pos, set->num_id - 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_is_empty(struct idset *set)
- {
- return bitmap_empty(set->bitmap, set->num_ssid * set->num_id);
- }
- void idset_add_set(struct idset *to, struct idset *from)
- {
- int len = min(to->num_ssid * to->num_id, from->num_ssid * from->num_id);
- bitmap_or(to->bitmap, to->bitmap, from->bitmap, len);
- }
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