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1/*
2 * VMware VMCI Driver
3 *
4 * Copyright (C) 2012 VMware, Inc. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation version 2 and no later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * for more details.
14 */
15
16#include <linux/slab.h>
17#include "vmci_handle_array.h"
18
19static size_t handle_arr_calc_size(size_t capacity)
20{
21 return sizeof(struct vmci_handle_arr) +
22 capacity * sizeof(struct vmci_handle);
23}
24
25struct vmci_handle_arr *vmci_handle_arr_create(size_t capacity)
26{
27 struct vmci_handle_arr *array;
28
29 if (capacity == 0)
30 capacity = VMCI_HANDLE_ARRAY_DEFAULT_SIZE;
31
32 array = kmalloc(handle_arr_calc_size(capacity), GFP_ATOMIC);
33 if (!array)
34 return NULL;
35
36 array->capacity = capacity;
37 array->size = 0;
38
39 return array;
40}
41
42void vmci_handle_arr_destroy(struct vmci_handle_arr *array)
43{
44 kfree(array);
45}
46
47void vmci_handle_arr_append_entry(struct vmci_handle_arr **array_ptr,
48 struct vmci_handle handle)
49{
50 struct vmci_handle_arr *array = *array_ptr;
51
52 if (unlikely(array->size >= array->capacity)) {
53 /* reallocate. */
54 struct vmci_handle_arr *new_array;
55 size_t new_capacity = array->capacity * VMCI_ARR_CAP_MULT;
56 size_t new_size = handle_arr_calc_size(new_capacity);
57
58 new_array = krealloc(array, new_size, GFP_ATOMIC);
59 if (!new_array)
60 return;
61
62 new_array->capacity = new_capacity;
63 *array_ptr = array = new_array;
64 }
65
66 array->entries[array->size] = handle;
67 array->size++;
68}
69
70/*
71 * Handle that was removed, VMCI_INVALID_HANDLE if entry not found.
72 */
73struct vmci_handle vmci_handle_arr_remove_entry(struct vmci_handle_arr *array,
74 struct vmci_handle entry_handle)
75{
76 struct vmci_handle handle = VMCI_INVALID_HANDLE;
77 size_t i;
78
79 for (i = 0; i < array->size; i++) {
80 if (vmci_handle_is_equal(array->entries[i], entry_handle)) {
81 handle = array->entries[i];
82 array->size--;
83 array->entries[i] = array->entries[array->size];
84 array->entries[array->size] = VMCI_INVALID_HANDLE;
85 break;
86 }
87 }
88
89 return handle;
90}
91
92/*
93 * Handle that was removed, VMCI_INVALID_HANDLE if array was empty.
94 */
95struct vmci_handle vmci_handle_arr_remove_tail(struct vmci_handle_arr *array)
96{
97 struct vmci_handle handle = VMCI_INVALID_HANDLE;
98
99 if (array->size) {
100 array->size--;
101 handle = array->entries[array->size];
102 array->entries[array->size] = VMCI_INVALID_HANDLE;
103 }
104
105 return handle;
106}
107
108/*
109 * Handle at given index, VMCI_INVALID_HANDLE if invalid index.
110 */
111struct vmci_handle
112vmci_handle_arr_get_entry(const struct vmci_handle_arr *array, size_t index)
113{
114 if (unlikely(index >= array->size))
115 return VMCI_INVALID_HANDLE;
116
117 return array->entries[index];
118}
119
120bool vmci_handle_arr_has_entry(const struct vmci_handle_arr *array,
121 struct vmci_handle entry_handle)
122{
123 size_t i;
124
125 for (i = 0; i < array->size; i++)
126 if (vmci_handle_is_equal(array->entries[i], entry_handle))
127 return true;
128
129 return false;
130}
131
132/*
133 * NULL if the array is empty. Otherwise, a pointer to the array
134 * of VMCI handles in the handle array.
135 */
136struct vmci_handle *vmci_handle_arr_get_handles(struct vmci_handle_arr *array)
137{
138 if (array->size)
139 return array->entries;
140
141 return NULL;
142}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * VMware VMCI Driver
4 *
5 * Copyright (C) 2012 VMware, Inc. All rights reserved.
6 */
7
8#include <linux/slab.h>
9#include "vmci_handle_array.h"
10
11static size_t handle_arr_calc_size(u32 capacity)
12{
13 return VMCI_HANDLE_ARRAY_HEADER_SIZE +
14 capacity * sizeof(struct vmci_handle);
15}
16
17struct vmci_handle_arr *vmci_handle_arr_create(u32 capacity, u32 max_capacity)
18{
19 struct vmci_handle_arr *array;
20
21 if (max_capacity == 0 || capacity > max_capacity)
22 return NULL;
23
24 if (capacity == 0)
25 capacity = min((u32)VMCI_HANDLE_ARRAY_DEFAULT_CAPACITY,
26 max_capacity);
27
28 array = kmalloc(handle_arr_calc_size(capacity), GFP_ATOMIC);
29 if (!array)
30 return NULL;
31
32 array->capacity = capacity;
33 array->max_capacity = max_capacity;
34 array->size = 0;
35
36 return array;
37}
38
39void vmci_handle_arr_destroy(struct vmci_handle_arr *array)
40{
41 kfree(array);
42}
43
44int vmci_handle_arr_append_entry(struct vmci_handle_arr **array_ptr,
45 struct vmci_handle handle)
46{
47 struct vmci_handle_arr *array = *array_ptr;
48
49 if (unlikely(array->size >= array->capacity)) {
50 /* reallocate. */
51 struct vmci_handle_arr *new_array;
52 u32 capacity_bump = min(array->max_capacity - array->capacity,
53 array->capacity);
54 size_t new_size = handle_arr_calc_size(array->capacity +
55 capacity_bump);
56
57 if (array->size >= array->max_capacity)
58 return VMCI_ERROR_NO_MEM;
59
60 new_array = krealloc(array, new_size, GFP_ATOMIC);
61 if (!new_array)
62 return VMCI_ERROR_NO_MEM;
63
64 new_array->capacity += capacity_bump;
65 *array_ptr = array = new_array;
66 }
67
68 array->entries[array->size] = handle;
69 array->size++;
70
71 return VMCI_SUCCESS;
72}
73
74/*
75 * Handle that was removed, VMCI_INVALID_HANDLE if entry not found.
76 */
77struct vmci_handle vmci_handle_arr_remove_entry(struct vmci_handle_arr *array,
78 struct vmci_handle entry_handle)
79{
80 struct vmci_handle handle = VMCI_INVALID_HANDLE;
81 u32 i;
82
83 for (i = 0; i < array->size; i++) {
84 if (vmci_handle_is_equal(array->entries[i], entry_handle)) {
85 handle = array->entries[i];
86 array->size--;
87 array->entries[i] = array->entries[array->size];
88 array->entries[array->size] = VMCI_INVALID_HANDLE;
89 break;
90 }
91 }
92
93 return handle;
94}
95
96/*
97 * Handle that was removed, VMCI_INVALID_HANDLE if array was empty.
98 */
99struct vmci_handle vmci_handle_arr_remove_tail(struct vmci_handle_arr *array)
100{
101 struct vmci_handle handle = VMCI_INVALID_HANDLE;
102
103 if (array->size) {
104 array->size--;
105 handle = array->entries[array->size];
106 array->entries[array->size] = VMCI_INVALID_HANDLE;
107 }
108
109 return handle;
110}
111
112/*
113 * Handle at given index, VMCI_INVALID_HANDLE if invalid index.
114 */
115struct vmci_handle
116vmci_handle_arr_get_entry(const struct vmci_handle_arr *array, u32 index)
117{
118 if (unlikely(index >= array->size))
119 return VMCI_INVALID_HANDLE;
120
121 return array->entries[index];
122}
123
124bool vmci_handle_arr_has_entry(const struct vmci_handle_arr *array,
125 struct vmci_handle entry_handle)
126{
127 u32 i;
128
129 for (i = 0; i < array->size; i++)
130 if (vmci_handle_is_equal(array->entries[i], entry_handle))
131 return true;
132
133 return false;
134}
135
136/*
137 * NULL if the array is empty. Otherwise, a pointer to the array
138 * of VMCI handles in the handle array.
139 */
140struct vmci_handle *vmci_handle_arr_get_handles(struct vmci_handle_arr *array)
141{
142 if (array->size)
143 return array->entries;
144
145 return NULL;
146}