Skylar Chang | a951658 | 2017-05-09 11:36:47 -0700 | [diff] [blame] | 1 | /* Copyright (c) 2013-2017, The Linux Foundation. All rights reserved. |
Amir Levy | 9659e59 | 2016-10-27 18:08:27 +0300 | [diff] [blame] | 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/slab.h> |
| 14 | #include "ipa_rm_i.h" |
| 15 | |
| 16 | /** |
| 17 | * ipa_rm_peers_list_get_resource_index() - resource name to index |
| 18 | * of this resource in corresponding peers list |
| 19 | * @resource_name: [in] resource name |
| 20 | * |
| 21 | * Returns: resource index mapping, IPA_RM_INDEX_INVALID |
| 22 | * in case provided resource name isn't contained in enum |
| 23 | * ipa_rm_resource_name. |
| 24 | * |
| 25 | */ |
| 26 | static int ipa_rm_peers_list_get_resource_index( |
| 27 | enum ipa_rm_resource_name resource_name) |
| 28 | { |
| 29 | int resource_index = IPA_RM_INDEX_INVALID; |
| 30 | |
| 31 | if (IPA_RM_RESORCE_IS_PROD(resource_name)) |
| 32 | resource_index = ipa_rm_prod_index(resource_name); |
| 33 | else if (IPA_RM_RESORCE_IS_CONS(resource_name)) { |
| 34 | resource_index = ipa_rm_cons_index(resource_name); |
Amir Levy | 9659e59 | 2016-10-27 18:08:27 +0300 | [diff] [blame] | 35 | } |
| 36 | |
| 37 | return resource_index; |
| 38 | } |
| 39 | |
| 40 | static bool ipa_rm_peers_list_check_index(int index, |
| 41 | struct ipa_rm_peers_list *peers_list) |
| 42 | { |
| 43 | return !(index > peers_list->max_peers || index < 0); |
| 44 | } |
| 45 | |
| 46 | /** |
| 47 | * ipa_rm_peers_list_create() - creates the peers list |
| 48 | * |
| 49 | * @max_peers: maximum number of peers in new list |
| 50 | * @peers_list: [out] newly created peers list |
| 51 | * |
| 52 | * Returns: 0 in case of SUCCESS, negative otherwise |
| 53 | */ |
| 54 | int ipa_rm_peers_list_create(int max_peers, |
| 55 | struct ipa_rm_peers_list **peers_list) |
| 56 | { |
| 57 | int result; |
| 58 | |
| 59 | *peers_list = kzalloc(sizeof(**peers_list), GFP_ATOMIC); |
| 60 | if (!*peers_list) { |
| 61 | IPA_RM_ERR("no mem\n"); |
| 62 | result = -ENOMEM; |
| 63 | goto bail; |
| 64 | } |
| 65 | |
| 66 | (*peers_list)->max_peers = max_peers; |
| 67 | (*peers_list)->peers = kzalloc((*peers_list)->max_peers * |
| 68 | sizeof(*((*peers_list)->peers)), GFP_ATOMIC); |
| 69 | if (!((*peers_list)->peers)) { |
| 70 | IPA_RM_ERR("no mem\n"); |
| 71 | result = -ENOMEM; |
| 72 | goto list_alloc_fail; |
| 73 | } |
| 74 | |
| 75 | return 0; |
| 76 | |
| 77 | list_alloc_fail: |
| 78 | kfree(*peers_list); |
| 79 | bail: |
| 80 | return result; |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | * ipa_rm_peers_list_delete() - deletes the peers list |
| 85 | * |
| 86 | * @peers_list: peers list |
| 87 | * |
| 88 | */ |
| 89 | void ipa_rm_peers_list_delete(struct ipa_rm_peers_list *peers_list) |
| 90 | { |
| 91 | if (peers_list) { |
| 92 | kfree(peers_list->peers); |
| 93 | kfree(peers_list); |
| 94 | } |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * ipa_rm_peers_list_remove_peer() - removes peer from the list |
| 99 | * |
| 100 | * @peers_list: peers list |
| 101 | * @resource_name: name of the resource to remove |
| 102 | * |
| 103 | */ |
| 104 | void ipa_rm_peers_list_remove_peer( |
| 105 | struct ipa_rm_peers_list *peers_list, |
| 106 | enum ipa_rm_resource_name resource_name) |
| 107 | { |
| 108 | if (!peers_list) |
| 109 | return; |
| 110 | |
| 111 | peers_list->peers[ipa_rm_peers_list_get_resource_index( |
| 112 | resource_name)].resource = NULL; |
| 113 | peers_list->peers[ipa_rm_peers_list_get_resource_index( |
| 114 | resource_name)].userspace_dep = false; |
| 115 | peers_list->peers_count--; |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * ipa_rm_peers_list_add_peer() - adds peer to the list |
| 120 | * |
| 121 | * @peers_list: peers list |
| 122 | * @resource: resource to add |
| 123 | * |
| 124 | */ |
| 125 | void ipa_rm_peers_list_add_peer( |
| 126 | struct ipa_rm_peers_list *peers_list, |
| 127 | struct ipa_rm_resource *resource, |
| 128 | bool userspace_dep) |
| 129 | { |
| 130 | if (!peers_list || !resource) |
| 131 | return; |
| 132 | |
| 133 | peers_list->peers[ipa_rm_peers_list_get_resource_index( |
| 134 | resource->name)].resource = resource; |
| 135 | peers_list->peers[ipa_rm_peers_list_get_resource_index( |
| 136 | resource->name)].userspace_dep = userspace_dep; |
| 137 | peers_list->peers_count++; |
| 138 | } |
| 139 | |
| 140 | /** |
| 141 | * ipa_rm_peers_list_is_empty() - checks |
| 142 | * if resource peers list is empty |
| 143 | * |
| 144 | * @peers_list: peers list |
| 145 | * |
| 146 | * Returns: true if the list is empty, false otherwise |
| 147 | */ |
| 148 | bool ipa_rm_peers_list_is_empty(struct ipa_rm_peers_list *peers_list) |
| 149 | { |
| 150 | bool result = true; |
| 151 | |
| 152 | if (!peers_list) |
| 153 | goto bail; |
| 154 | |
| 155 | if (peers_list->peers_count > 0) |
| 156 | result = false; |
| 157 | bail: |
| 158 | return result; |
| 159 | } |
| 160 | |
| 161 | /** |
| 162 | * ipa_rm_peers_list_has_last_peer() - checks |
| 163 | * if resource peers list has exactly one peer |
| 164 | * |
| 165 | * @peers_list: peers list |
| 166 | * |
| 167 | * Returns: true if the list has exactly one peer, false otherwise |
| 168 | */ |
| 169 | bool ipa_rm_peers_list_has_last_peer( |
| 170 | struct ipa_rm_peers_list *peers_list) |
| 171 | { |
| 172 | bool result = false; |
| 173 | |
| 174 | if (!peers_list) |
| 175 | goto bail; |
| 176 | |
| 177 | if (peers_list->peers_count == 1) |
| 178 | result = true; |
| 179 | bail: |
| 180 | return result; |
| 181 | } |
| 182 | |
| 183 | /** |
| 184 | * ipa_rm_peers_list_check_dependency() - check dependency |
| 185 | * between 2 peer lists |
| 186 | * @resource_peers: first peers list |
| 187 | * @resource_name: first peers list resource name |
| 188 | * @depends_on_peers: second peers list |
| 189 | * @depends_on_name: second peers list resource name |
| 190 | * @userspace_dep: [out] dependency was created by userspace |
| 191 | * |
| 192 | * Returns: true if there is dependency, false otherwise |
| 193 | * |
| 194 | */ |
| 195 | bool ipa_rm_peers_list_check_dependency( |
| 196 | struct ipa_rm_peers_list *resource_peers, |
| 197 | enum ipa_rm_resource_name resource_name, |
| 198 | struct ipa_rm_peers_list *depends_on_peers, |
| 199 | enum ipa_rm_resource_name depends_on_name, |
| 200 | bool *userspace_dep) |
| 201 | { |
| 202 | bool result = false; |
| 203 | int resource_index; |
| 204 | |
| 205 | if (!resource_peers || !depends_on_peers || !userspace_dep) |
| 206 | return result; |
| 207 | |
| 208 | resource_index = ipa_rm_peers_list_get_resource_index(depends_on_name); |
| 209 | if (resource_peers->peers[resource_index].resource != NULL) { |
| 210 | result = true; |
| 211 | *userspace_dep = resource_peers->peers[resource_index]. |
| 212 | userspace_dep; |
| 213 | } |
| 214 | |
| 215 | resource_index = ipa_rm_peers_list_get_resource_index(resource_name); |
| 216 | if (depends_on_peers->peers[resource_index].resource != NULL) { |
| 217 | result = true; |
| 218 | *userspace_dep = depends_on_peers->peers[resource_index]. |
| 219 | userspace_dep; |
| 220 | } |
| 221 | |
| 222 | return result; |
| 223 | } |
| 224 | |
| 225 | /** |
| 226 | * ipa_rm_peers_list_get_resource() - get resource by |
| 227 | * resource index |
| 228 | * @resource_index: resource index |
| 229 | * @resource_peers: peers list |
| 230 | * |
| 231 | * Returns: the resource if found, NULL otherwise |
| 232 | */ |
| 233 | struct ipa_rm_resource *ipa_rm_peers_list_get_resource(int resource_index, |
| 234 | struct ipa_rm_peers_list *resource_peers) |
| 235 | { |
| 236 | struct ipa_rm_resource *result = NULL; |
| 237 | |
| 238 | if (!ipa_rm_peers_list_check_index(resource_index, resource_peers)) |
| 239 | goto bail; |
| 240 | |
| 241 | result = resource_peers->peers[resource_index].resource; |
| 242 | bail: |
| 243 | return result; |
| 244 | } |
| 245 | |
| 246 | /** |
| 247 | * ipa_rm_peers_list_get_userspace_dep() - returns whether resource dependency |
| 248 | * was added by userspace |
| 249 | * @resource_index: resource index |
| 250 | * @resource_peers: peers list |
| 251 | * |
| 252 | * Returns: true if dependency was added by userspace, false by kernel |
| 253 | */ |
| 254 | bool ipa_rm_peers_list_get_userspace_dep(int resource_index, |
| 255 | struct ipa_rm_peers_list *resource_peers) |
| 256 | { |
| 257 | bool result = false; |
| 258 | |
| 259 | if (!ipa_rm_peers_list_check_index(resource_index, resource_peers)) |
| 260 | goto bail; |
| 261 | |
| 262 | result = resource_peers->peers[resource_index].userspace_dep; |
| 263 | bail: |
| 264 | return result; |
| 265 | } |
| 266 | |
| 267 | /** |
| 268 | * ipa_rm_peers_list_get_size() - get peers list sise |
| 269 | * |
| 270 | * @peers_list: peers list |
| 271 | * |
| 272 | * Returns: the size of the peers list |
| 273 | */ |
| 274 | int ipa_rm_peers_list_get_size(struct ipa_rm_peers_list *peers_list) |
| 275 | { |
| 276 | return peers_list->max_peers; |
| 277 | } |