Amir Levy | 9659e59 | 2016-10-27 18:08:27 +0300 | [diff] [blame] | 1 | /* Copyright (c) 2013-2016, The Linux Foundation. All rights reserved. |
| 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_dependency_graph.h" |
| 15 | #include "ipa_rm_i.h" |
| 16 | |
| 17 | static int ipa_rm_dep_get_index(enum ipa_rm_resource_name resource_name) |
| 18 | { |
| 19 | int resource_index = IPA_RM_INDEX_INVALID; |
| 20 | |
| 21 | if (IPA_RM_RESORCE_IS_PROD(resource_name)) |
| 22 | resource_index = ipa_rm_prod_index(resource_name); |
| 23 | else if (IPA_RM_RESORCE_IS_CONS(resource_name)) |
| 24 | resource_index = ipa_rm_cons_index(resource_name); |
| 25 | |
| 26 | return resource_index; |
| 27 | } |
| 28 | |
| 29 | /** |
| 30 | * ipa_rm_dep_graph_create() - creates graph |
| 31 | * @dep_graph: [out] created dependency graph |
| 32 | * |
| 33 | * Returns: dependency graph on success, NULL on failure |
| 34 | */ |
| 35 | int ipa_rm_dep_graph_create(struct ipa_rm_dep_graph **dep_graph) |
| 36 | { |
| 37 | int result = 0; |
| 38 | |
| 39 | *dep_graph = kzalloc(sizeof(**dep_graph), GFP_KERNEL); |
| 40 | if (!*dep_graph) { |
| 41 | IPA_RM_ERR("no mem\n"); |
| 42 | result = -ENOMEM; |
| 43 | goto bail; |
| 44 | } |
| 45 | bail: |
| 46 | return result; |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * ipa_rm_dep_graph_delete() - destroyes the graph |
| 51 | * @graph: [in] dependency graph |
| 52 | * |
| 53 | * Frees all resources. |
| 54 | */ |
| 55 | void ipa_rm_dep_graph_delete(struct ipa_rm_dep_graph *graph) |
| 56 | { |
| 57 | int resource_index; |
| 58 | |
| 59 | if (!graph) { |
| 60 | IPA_RM_ERR("invalid params\n"); |
| 61 | return; |
| 62 | } |
| 63 | for (resource_index = 0; |
| 64 | resource_index < IPA_RM_RESOURCE_MAX; |
| 65 | resource_index++) |
| 66 | kfree(graph->resource_table[resource_index]); |
| 67 | memset(graph->resource_table, 0, sizeof(graph->resource_table)); |
| 68 | } |
| 69 | |
| 70 | /** |
| 71 | * ipa_rm_dep_graph_get_resource() - provides a resource by name |
| 72 | * @graph: [in] dependency graph |
| 73 | * @name: [in] name of the resource |
| 74 | * @resource: [out] resource in case of success |
| 75 | * |
| 76 | * Returns: 0 on success, negative on failure |
| 77 | */ |
| 78 | int ipa_rm_dep_graph_get_resource( |
| 79 | struct ipa_rm_dep_graph *graph, |
| 80 | enum ipa_rm_resource_name resource_name, |
| 81 | struct ipa_rm_resource **resource) |
| 82 | { |
| 83 | int result; |
| 84 | int resource_index; |
| 85 | |
| 86 | if (!graph) { |
| 87 | result = -EINVAL; |
| 88 | goto bail; |
| 89 | } |
| 90 | resource_index = ipa_rm_dep_get_index(resource_name); |
| 91 | if (resource_index == IPA_RM_INDEX_INVALID) { |
| 92 | result = -EINVAL; |
| 93 | goto bail; |
| 94 | } |
| 95 | *resource = graph->resource_table[resource_index]; |
| 96 | if (!*resource) { |
| 97 | result = -EINVAL; |
| 98 | goto bail; |
| 99 | } |
| 100 | result = 0; |
| 101 | bail: |
| 102 | return result; |
| 103 | } |
| 104 | |
| 105 | /** |
| 106 | * ipa_rm_dep_graph_add() - adds resource to graph |
| 107 | * @graph: [in] dependency graph |
| 108 | * @resource: [in] resource to add |
| 109 | * |
| 110 | * Returns: 0 on success, negative on failure |
| 111 | */ |
| 112 | int ipa_rm_dep_graph_add(struct ipa_rm_dep_graph *graph, |
| 113 | struct ipa_rm_resource *resource) |
| 114 | { |
| 115 | int result = 0; |
| 116 | int resource_index; |
| 117 | |
| 118 | if (!graph || !resource) { |
| 119 | result = -EINVAL; |
| 120 | goto bail; |
| 121 | } |
| 122 | resource_index = ipa_rm_dep_get_index(resource->name); |
| 123 | if (resource_index == IPA_RM_INDEX_INVALID) { |
| 124 | result = -EINVAL; |
| 125 | goto bail; |
| 126 | } |
| 127 | graph->resource_table[resource_index] = resource; |
| 128 | bail: |
| 129 | return result; |
| 130 | } |
| 131 | |
| 132 | /** |
| 133 | * ipa_rm_dep_graph_remove() - removes resource from graph |
| 134 | * @graph: [in] dependency graph |
| 135 | * @resource: [in] resource to add |
| 136 | * |
| 137 | * Returns: 0 on success, negative on failure |
| 138 | */ |
| 139 | int ipa_rm_dep_graph_remove(struct ipa_rm_dep_graph *graph, |
| 140 | enum ipa_rm_resource_name resource_name) |
| 141 | { |
| 142 | if (!graph) |
| 143 | return -EINVAL; |
| 144 | graph->resource_table[resource_name] = NULL; |
| 145 | |
| 146 | return 0; |
| 147 | } |
| 148 | |
| 149 | /** |
| 150 | * ipa_rm_dep_graph_add_dependency() - adds dependency between |
| 151 | * two nodes in graph |
| 152 | * @graph: [in] dependency graph |
| 153 | * @resource_name: [in] resource to add |
| 154 | * @depends_on_name: [in] resource to add |
| 155 | * @userspace_dep: [in] operation requested by userspace ? |
| 156 | * |
| 157 | * Returns: 0 on success, negative on failure |
| 158 | */ |
| 159 | int ipa_rm_dep_graph_add_dependency(struct ipa_rm_dep_graph *graph, |
| 160 | enum ipa_rm_resource_name resource_name, |
| 161 | enum ipa_rm_resource_name depends_on_name, |
| 162 | bool userspace_dep) |
| 163 | { |
| 164 | struct ipa_rm_resource *dependent = NULL; |
| 165 | struct ipa_rm_resource *dependency = NULL; |
| 166 | int result; |
| 167 | |
| 168 | if (!graph || |
| 169 | !IPA_RM_RESORCE_IS_PROD(resource_name) || |
| 170 | !IPA_RM_RESORCE_IS_CONS(depends_on_name)) { |
| 171 | IPA_RM_ERR("invalid params\n"); |
| 172 | result = -EINVAL; |
| 173 | goto bail; |
| 174 | } |
| 175 | if (ipa_rm_dep_graph_get_resource(graph, |
| 176 | resource_name, |
| 177 | &dependent)) { |
| 178 | IPA_RM_ERR("%s does not exist\n", |
| 179 | ipa_rm_resource_str(resource_name)); |
| 180 | result = -EINVAL; |
| 181 | goto bail; |
| 182 | } |
| 183 | if (ipa_rm_dep_graph_get_resource(graph, |
| 184 | depends_on_name, |
| 185 | &dependency)) { |
| 186 | IPA_RM_ERR("%s does not exist\n", |
| 187 | ipa_rm_resource_str(depends_on_name)); |
| 188 | result = -EINVAL; |
| 189 | goto bail; |
| 190 | } |
| 191 | result = ipa_rm_resource_add_dependency(dependent, dependency, |
| 192 | userspace_dep); |
| 193 | bail: |
| 194 | IPA_RM_DBG("EXIT with %d\n", result); |
| 195 | |
| 196 | return result; |
| 197 | } |
| 198 | |
| 199 | /** |
| 200 | * ipa_rm_dep_graph_delete_dependency() - deleted dependency between |
| 201 | * two nodes in graph |
| 202 | * @graph: [in] dependency graph |
| 203 | * @resource_name: [in] resource to delete |
| 204 | * @depends_on_name: [in] resource to delete |
| 205 | * @userspace_dep: [in] operation requested by userspace ? |
| 206 | * |
| 207 | * Returns: 0 on success, negative on failure |
| 208 | * |
| 209 | */ |
| 210 | int ipa_rm_dep_graph_delete_dependency(struct ipa_rm_dep_graph *graph, |
| 211 | enum ipa_rm_resource_name resource_name, |
| 212 | enum ipa_rm_resource_name depends_on_name, |
| 213 | bool userspace_dep) |
| 214 | { |
| 215 | struct ipa_rm_resource *dependent = NULL; |
| 216 | struct ipa_rm_resource *dependency = NULL; |
| 217 | int result; |
| 218 | |
| 219 | if (!graph || |
| 220 | !IPA_RM_RESORCE_IS_PROD(resource_name) || |
| 221 | !IPA_RM_RESORCE_IS_CONS(depends_on_name)) { |
| 222 | IPA_RM_ERR("invalid params\n"); |
| 223 | result = -EINVAL; |
| 224 | goto bail; |
| 225 | } |
| 226 | |
| 227 | if (ipa_rm_dep_graph_get_resource(graph, |
| 228 | resource_name, |
| 229 | &dependent)) { |
Sunil Paidimarri | 4dbe11c | 2016-11-09 17:29:06 -0800 | [diff] [blame] | 230 | IPA_RM_DBG("%s does not exist\n", |
Amir Levy | 9659e59 | 2016-10-27 18:08:27 +0300 | [diff] [blame] | 231 | ipa_rm_resource_str(resource_name)); |
| 232 | result = -EINVAL; |
| 233 | goto bail; |
| 234 | } |
| 235 | |
| 236 | if (ipa_rm_dep_graph_get_resource(graph, |
| 237 | depends_on_name, |
| 238 | &dependency)) { |
Sunil Paidimarri | 4dbe11c | 2016-11-09 17:29:06 -0800 | [diff] [blame] | 239 | IPA_RM_DBG("%s does not exist\n", |
Amir Levy | 9659e59 | 2016-10-27 18:08:27 +0300 | [diff] [blame] | 240 | ipa_rm_resource_str(depends_on_name)); |
| 241 | result = -EINVAL; |
| 242 | goto bail; |
| 243 | } |
| 244 | |
| 245 | result = ipa_rm_resource_delete_dependency(dependent, dependency, |
| 246 | userspace_dep); |
| 247 | bail: |
| 248 | IPA_RM_DBG("EXIT with %d\n", result); |
| 249 | |
| 250 | return result; |
| 251 | } |