George Zhang | b484b26 | 2013-01-08 15:54:39 -0800 | [diff] [blame] | 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 | |
Vishnu DASA | 6f56992 | 2019-05-24 15:13:10 +0000 | [diff] [blame] | 19 | static size_t handle_arr_calc_size(u32 capacity) |
George Zhang | b484b26 | 2013-01-08 15:54:39 -0800 | [diff] [blame] | 20 | { |
Vishnu DASA | 6f56992 | 2019-05-24 15:13:10 +0000 | [diff] [blame] | 21 | return VMCI_HANDLE_ARRAY_HEADER_SIZE + |
George Zhang | b484b26 | 2013-01-08 15:54:39 -0800 | [diff] [blame] | 22 | capacity * sizeof(struct vmci_handle); |
| 23 | } |
| 24 | |
Vishnu DASA | 6f56992 | 2019-05-24 15:13:10 +0000 | [diff] [blame] | 25 | struct vmci_handle_arr *vmci_handle_arr_create(u32 capacity, u32 max_capacity) |
George Zhang | b484b26 | 2013-01-08 15:54:39 -0800 | [diff] [blame] | 26 | { |
| 27 | struct vmci_handle_arr *array; |
| 28 | |
Vishnu DASA | 6f56992 | 2019-05-24 15:13:10 +0000 | [diff] [blame] | 29 | if (max_capacity == 0 || capacity > max_capacity) |
| 30 | return NULL; |
| 31 | |
George Zhang | b484b26 | 2013-01-08 15:54:39 -0800 | [diff] [blame] | 32 | if (capacity == 0) |
Vishnu DASA | 6f56992 | 2019-05-24 15:13:10 +0000 | [diff] [blame] | 33 | capacity = min((u32)VMCI_HANDLE_ARRAY_DEFAULT_CAPACITY, |
| 34 | max_capacity); |
George Zhang | b484b26 | 2013-01-08 15:54:39 -0800 | [diff] [blame] | 35 | |
| 36 | array = kmalloc(handle_arr_calc_size(capacity), GFP_ATOMIC); |
| 37 | if (!array) |
| 38 | return NULL; |
| 39 | |
| 40 | array->capacity = capacity; |
Vishnu DASA | 6f56992 | 2019-05-24 15:13:10 +0000 | [diff] [blame] | 41 | array->max_capacity = max_capacity; |
George Zhang | b484b26 | 2013-01-08 15:54:39 -0800 | [diff] [blame] | 42 | array->size = 0; |
| 43 | |
| 44 | return array; |
| 45 | } |
| 46 | |
| 47 | void vmci_handle_arr_destroy(struct vmci_handle_arr *array) |
| 48 | { |
| 49 | kfree(array); |
| 50 | } |
| 51 | |
Vishnu DASA | 6f56992 | 2019-05-24 15:13:10 +0000 | [diff] [blame] | 52 | int vmci_handle_arr_append_entry(struct vmci_handle_arr **array_ptr, |
| 53 | struct vmci_handle handle) |
George Zhang | b484b26 | 2013-01-08 15:54:39 -0800 | [diff] [blame] | 54 | { |
| 55 | struct vmci_handle_arr *array = *array_ptr; |
| 56 | |
| 57 | if (unlikely(array->size >= array->capacity)) { |
| 58 | /* reallocate. */ |
| 59 | struct vmci_handle_arr *new_array; |
Vishnu DASA | 6f56992 | 2019-05-24 15:13:10 +0000 | [diff] [blame] | 60 | u32 capacity_bump = min(array->max_capacity - array->capacity, |
| 61 | array->capacity); |
| 62 | size_t new_size = handle_arr_calc_size(array->capacity + |
| 63 | capacity_bump); |
| 64 | |
| 65 | if (array->size >= array->max_capacity) |
| 66 | return VMCI_ERROR_NO_MEM; |
George Zhang | b484b26 | 2013-01-08 15:54:39 -0800 | [diff] [blame] | 67 | |
| 68 | new_array = krealloc(array, new_size, GFP_ATOMIC); |
| 69 | if (!new_array) |
Vishnu DASA | 6f56992 | 2019-05-24 15:13:10 +0000 | [diff] [blame] | 70 | return VMCI_ERROR_NO_MEM; |
George Zhang | b484b26 | 2013-01-08 15:54:39 -0800 | [diff] [blame] | 71 | |
Vishnu DASA | 6f56992 | 2019-05-24 15:13:10 +0000 | [diff] [blame] | 72 | new_array->capacity += capacity_bump; |
George Zhang | b484b26 | 2013-01-08 15:54:39 -0800 | [diff] [blame] | 73 | *array_ptr = array = new_array; |
| 74 | } |
| 75 | |
| 76 | array->entries[array->size] = handle; |
| 77 | array->size++; |
Vishnu DASA | 6f56992 | 2019-05-24 15:13:10 +0000 | [diff] [blame] | 78 | |
| 79 | return VMCI_SUCCESS; |
George Zhang | b484b26 | 2013-01-08 15:54:39 -0800 | [diff] [blame] | 80 | } |
| 81 | |
| 82 | /* |
| 83 | * Handle that was removed, VMCI_INVALID_HANDLE if entry not found. |
| 84 | */ |
| 85 | struct vmci_handle vmci_handle_arr_remove_entry(struct vmci_handle_arr *array, |
| 86 | struct vmci_handle entry_handle) |
| 87 | { |
| 88 | struct vmci_handle handle = VMCI_INVALID_HANDLE; |
Vishnu DASA | 6f56992 | 2019-05-24 15:13:10 +0000 | [diff] [blame] | 89 | u32 i; |
George Zhang | b484b26 | 2013-01-08 15:54:39 -0800 | [diff] [blame] | 90 | |
| 91 | for (i = 0; i < array->size; i++) { |
| 92 | if (vmci_handle_is_equal(array->entries[i], entry_handle)) { |
| 93 | handle = array->entries[i]; |
| 94 | array->size--; |
| 95 | array->entries[i] = array->entries[array->size]; |
| 96 | array->entries[array->size] = VMCI_INVALID_HANDLE; |
| 97 | break; |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | return handle; |
| 102 | } |
| 103 | |
| 104 | /* |
| 105 | * Handle that was removed, VMCI_INVALID_HANDLE if array was empty. |
| 106 | */ |
| 107 | struct vmci_handle vmci_handle_arr_remove_tail(struct vmci_handle_arr *array) |
| 108 | { |
| 109 | struct vmci_handle handle = VMCI_INVALID_HANDLE; |
| 110 | |
| 111 | if (array->size) { |
| 112 | array->size--; |
| 113 | handle = array->entries[array->size]; |
| 114 | array->entries[array->size] = VMCI_INVALID_HANDLE; |
| 115 | } |
| 116 | |
| 117 | return handle; |
| 118 | } |
| 119 | |
| 120 | /* |
| 121 | * Handle at given index, VMCI_INVALID_HANDLE if invalid index. |
| 122 | */ |
| 123 | struct vmci_handle |
Vishnu DASA | 6f56992 | 2019-05-24 15:13:10 +0000 | [diff] [blame] | 124 | vmci_handle_arr_get_entry(const struct vmci_handle_arr *array, u32 index) |
George Zhang | b484b26 | 2013-01-08 15:54:39 -0800 | [diff] [blame] | 125 | { |
| 126 | if (unlikely(index >= array->size)) |
| 127 | return VMCI_INVALID_HANDLE; |
| 128 | |
| 129 | return array->entries[index]; |
| 130 | } |
| 131 | |
| 132 | bool vmci_handle_arr_has_entry(const struct vmci_handle_arr *array, |
| 133 | struct vmci_handle entry_handle) |
| 134 | { |
Vishnu DASA | 6f56992 | 2019-05-24 15:13:10 +0000 | [diff] [blame] | 135 | u32 i; |
George Zhang | b484b26 | 2013-01-08 15:54:39 -0800 | [diff] [blame] | 136 | |
| 137 | for (i = 0; i < array->size; i++) |
| 138 | if (vmci_handle_is_equal(array->entries[i], entry_handle)) |
| 139 | return true; |
| 140 | |
| 141 | return false; |
| 142 | } |
| 143 | |
| 144 | /* |
| 145 | * NULL if the array is empty. Otherwise, a pointer to the array |
| 146 | * of VMCI handles in the handle array. |
| 147 | */ |
| 148 | struct vmci_handle *vmci_handle_arr_get_handles(struct vmci_handle_arr *array) |
| 149 | { |
| 150 | if (array->size) |
| 151 | return array->entries; |
| 152 | |
| 153 | return NULL; |
| 154 | } |