summaryrefslogtreecommitdiff
path: root/drivers/s390/cio/idset.c
blob: 4d10981c7cc102a3ffe1bf8c107cb08d5280d212 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
/*
 *  drivers/s390/cio/idset.c
 *
 *    Copyright IBM Corp. 2007
 *    Author(s): Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
 */

#include <linux/vmalloc.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 __BITOPS_WORDS(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_clear(struct idset *set)
{
	memset(set->bitmap, 0, bitmap_size(set->num_ssid, set->num_id));
}

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);
}

int idset_sch_contains(struct idset *set, struct subchannel_id schid)
{
	return idset_contains(set, schid.ssid, schid.sch_no);
}

int idset_sch_get_first(struct idset *set, struct subchannel_id *schid)
{
	int ssid = 0;
	int id = 0;
	int rc;

	rc = idset_get_first(set, &ssid, &id);
	if (rc) {
		init_subchannel_id(schid);
		schid->ssid = ssid;
		schid->sch_no = id;
	}
	return rc;
}

int idset_is_empty(struct idset *set)
{
	int bitnum;

	bitnum = find_first_bit(set->bitmap, set->num_ssid * set->num_id);
	if (bitnum >= set->num_ssid * set->num_id)
		return 1;
	return 0;
}

void idset_add_set(struct idset *to, struct idset *from)
{
	unsigned long i, len;

	len = min(__BITOPS_WORDS(to->num_ssid * to->num_id),
		  __BITOPS_WORDS(from->num_ssid * from->num_id));
	for (i = 0; i < len ; i++)
		to->bitmap[i] |= from->bitmap[i];
}