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/slab.h>
9 #include <linux/bitops.h>
10 #include "idset.h"
11 #include "css.h"
12
13 struct idset {
14 int num_ssid;
15 int num_id;
16 unsigned long bitmap[0];
17 };
18
19 static 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
24 static struct idset *idset_new(int num_ssid, int num_id)
25 {
26 struct idset *set;
27
28 set = kzalloc(sizeof(struct idset) + bitmap_size(num_ssid, num_id),
29 GFP_KERNEL);
30 if (set) {
31 set->num_ssid = num_ssid;
32 set->num_id = num_id;
33 }
34 return set;
35 }
36
37 void idset_free(struct idset *set)
38 {
39 kfree(set);
40 }
41
42 void idset_clear(struct idset *set)
43 {
44 memset(set->bitmap, 0, bitmap_size(set->num_ssid, set->num_id));
45 }
46
47 void idset_fill(struct idset *set)
48 {
49 memset(set->bitmap, 0xff, bitmap_size(set->num_ssid, set->num_id));
50 }
51
52 static inline void idset_add(struct idset *set, int ssid, int id)
53 {
54 set_bit(ssid * set->num_id + id, set->bitmap);
55 }
56
57 static inline void idset_del(struct idset *set, int ssid, int id)
58 {
59 clear_bit(ssid * set->num_id + id, set->bitmap);
60 }
61
62 static 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
67 static 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
79 struct idset *idset_sch_new(void)
80 {
81 return idset_new(__MAX_SSID + 1, __MAX_SUBCHANNEL + 1);
82 }
83
84 void idset_sch_add(struct idset *set, struct subchannel_id schid)
85 {
86 idset_add(set, schid.ssid, schid.sch_no);
87 }
88
89 void idset_sch_del(struct idset *set, struct subchannel_id schid)
90 {
91 idset_del(set, schid.ssid, schid.sch_no);
92 }
93
94 int idset_sch_contains(struct idset *set, struct subchannel_id schid)
95 {
96 return idset_contains(set, schid.ssid, schid.sch_no);
97 }
98
99 int 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
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