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a53c8fab3f
Remove the file name from the comment at top of many files. In most cases the file name was wrong anyway, so it's rather pointless. Also unify the IBM copyright statement. We did have a lot of sightly different statements and wanted to change them one after another whenever a file gets touched. However that never happened. Instead people start to take the old/"wrong" statements to use as a template for new files. So unify all of them in one go. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
131 lines
2.7 KiB
C
131 lines
2.7 KiB
C
/*
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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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