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1/*
2 * drivers/s390/cio/idset.c
3 *
4 * Copyright IBM Corp. 2007
5 * Author(s): Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
6 */
7
8#include <linux/vmalloc.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[0];
17};
18
19static inline unsigned long bitmap_size(int num_ssid, int num_id)
20{
21 return __BITOPS_WORDS(num_ssid * num_id) * sizeof(unsigned long);
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) + bitmap_size(num_ssid, num_id));
29 if (set) {
30 set->num_ssid = num_ssid;
31 set->num_id = num_id;
32 memset(set->bitmap, 0, bitmap_size(num_ssid, num_id));
33 }
34 return set;
35}
36
37void idset_free(struct idset *set)
38{
39 vfree(set);
40}
41
42void idset_clear(struct idset *set)
43{
44 memset(set->bitmap, 0, bitmap_size(set->num_ssid, set->num_id));
45}
46
47void idset_fill(struct idset *set)
48{
49 memset(set->bitmap, 0xff, bitmap_size(set->num_ssid, set->num_id));
50}
51
52static inline void idset_add(struct idset *set, int ssid, int id)
53{
54 set_bit(ssid * set->num_id + id, set->bitmap);
55}
56
57static inline void idset_del(struct idset *set, int ssid, int id)
58{
59 clear_bit(ssid * set->num_id + id, set->bitmap);
60}
61
62static inline int idset_contains(struct idset *set, int ssid, int id)
63{
64 return test_bit(ssid * set->num_id + id, set->bitmap);
65}
66
67static inline int idset_get_first(struct idset *set, int *ssid, int *id)
68{
69 int bitnum;
70
71 bitnum = find_first_bit(set->bitmap, set->num_ssid * set->num_id);
72 if (bitnum >= set->num_ssid * set->num_id)
73 return 0;
74 *ssid = bitnum / set->num_id;
75 *id = bitnum % set->num_id;
76 return 1;
77}
78
79struct idset *idset_sch_new(void)
80{
81 return idset_new(max_ssid + 1, __MAX_SUBCHANNEL + 1);
82}
83
84void idset_sch_add(struct idset *set, struct subchannel_id schid)
85{
86 idset_add(set, schid.ssid, schid.sch_no);
87}
88
89void idset_sch_del(struct idset *set, struct subchannel_id schid)
90{
91 idset_del(set, schid.ssid, schid.sch_no);
92}
93
94int idset_sch_contains(struct idset *set, struct subchannel_id schid)
95{
96 return idset_contains(set, schid.ssid, schid.sch_no);
97}
98
99int idset_sch_get_first(struct idset *set, struct subchannel_id *schid)
100{
101 int ssid = 0;
102 int id = 0;
103 int rc;
104
105 rc = idset_get_first(set, &ssid, &id);
106 if (rc) {
107 init_subchannel_id(schid);
108 schid->ssid = ssid;
109 schid->sch_no = id;
110 }
111 return rc;
112}
113
114int idset_is_empty(struct idset *set)
115{
116 int bitnum;
117
118 bitnum = find_first_bit(set->bitmap, set->num_ssid * set->num_id);
119 if (bitnum >= set->num_ssid * set->num_id)
120 return 1;
121 return 0;
122}
123
124void idset_add_set(struct idset *to, struct idset *from)
125{
126 unsigned long i, len;
127
128 len = min(__BITOPS_WORDS(to->num_ssid * to->num_id),
129 __BITOPS_WORDS(from->num_ssid * from->num_id));
130 for (i = 0; i < len ; i++)
131 to->bitmap[i] |= from->bitmap[i];
132}
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 bitmap_size(int num_ssid, int num_id)
20{
21 return BITS_TO_LONGS(num_ssid * num_id) * sizeof(unsigned long);
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) + bitmap_size(num_ssid, num_id));
29 if (set) {
30 set->num_ssid = num_ssid;
31 set->num_id = num_id;
32 memset(set->bitmap, 0, bitmap_size(num_ssid, num_id));
33 }
34 return set;
35}
36
37void idset_free(struct idset *set)
38{
39 vfree(set);
40}
41
42void idset_fill(struct idset *set)
43{
44 memset(set->bitmap, 0xff, bitmap_size(set->num_ssid, set->num_id));
45}
46
47static inline void idset_add(struct idset *set, int ssid, int id)
48{
49 set_bit(ssid * set->num_id + id, set->bitmap);
50}
51
52static inline void idset_del(struct idset *set, int ssid, int id)
53{
54 clear_bit(ssid * set->num_id + id, set->bitmap);
55}
56
57static inline int idset_contains(struct idset *set, int ssid, int id)
58{
59 return test_bit(ssid * set->num_id + id, set->bitmap);
60}
61
62struct idset *idset_sch_new(void)
63{
64 return idset_new(max_ssid + 1, __MAX_SUBCHANNEL + 1);
65}
66
67void idset_sch_add(struct idset *set, struct subchannel_id schid)
68{
69 idset_add(set, schid.ssid, schid.sch_no);
70}
71
72void idset_sch_del(struct idset *set, struct subchannel_id schid)
73{
74 idset_del(set, schid.ssid, schid.sch_no);
75}
76
77/* Clear ids starting from @schid up to end of subchannel set. */
78void idset_sch_del_subseq(struct idset *set, struct subchannel_id schid)
79{
80 int pos = schid.ssid * set->num_id + schid.sch_no;
81
82 bitmap_clear(set->bitmap, pos, set->num_id - schid.sch_no);
83}
84
85int idset_sch_contains(struct idset *set, struct subchannel_id schid)
86{
87 return idset_contains(set, schid.ssid, schid.sch_no);
88}
89
90int idset_is_empty(struct idset *set)
91{
92 return bitmap_empty(set->bitmap, set->num_ssid * set->num_id);
93}
94
95void idset_add_set(struct idset *to, struct idset *from)
96{
97 int len = min(to->num_ssid * to->num_id, from->num_ssid * from->num_id);
98
99 bitmap_or(to->bitmap, to->bitmap, from->bitmap, len);
100}