1 /* 2 * Copyright (c) 2017-2019 The Linux Foundation. All rights reserved. 3 * 4 * Permission to use, copy, modify, and/or distribute this software for 5 * any purpose with or without fee is hereby granted, provided that the 6 * above copyright notice and this permission notice appear in all 7 * copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL 10 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED 11 * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE 12 * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 13 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 14 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER 15 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 16 * PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <linux/kernel.h> 20 #include "qdf_mem.h" 21 #include "qdf_list.h" 22 #include "qdf_event.h" 23 #include "wlan_cfg80211.h" 24 #include "wlan_osif_request_manager.h" 25 26 /* arbitrary value */ 27 #define MAX_NUM_REQUESTS 20 28 29 static bool is_initialized; 30 static qdf_list_t requests; 31 static qdf_spinlock_t spinlock; 32 static void *cookie; 33 34 struct osif_request { 35 qdf_list_node_t node; 36 void *cookie; 37 uint32_t reference_count; 38 struct osif_request_params params; 39 qdf_event_t completed; 40 }; 41 42 /* must be called with spinlock held */ 43 static void osif_request_unlink(struct osif_request *request) 44 { 45 qdf_list_remove_node(&requests, &request->node); 46 } 47 48 static void osif_request_destroy(struct osif_request *request) 49 { 50 struct osif_request_params *params; 51 52 params = &request->params; 53 if (params->dealloc) { 54 void *priv = osif_request_priv(request); 55 56 params->dealloc(priv); 57 } 58 qdf_event_destroy(&request->completed); 59 qdf_mem_free(request); 60 } 61 62 /* must be called with spinlock held */ 63 static struct osif_request *osif_request_find(void *cookie) 64 { 65 QDF_STATUS status; 66 struct osif_request *request; 67 qdf_list_node_t *node; 68 69 status = qdf_list_peek_front(&requests, &node); 70 while (QDF_IS_STATUS_SUCCESS(status)) { 71 request = qdf_container_of(node, struct osif_request, node); 72 if (request->cookie == cookie) 73 return request; 74 status = qdf_list_peek_next(&requests, node, &node); 75 } 76 77 return NULL; 78 } 79 80 struct osif_request *osif_request_alloc(const struct osif_request_params *params) 81 { 82 size_t length; 83 struct osif_request *request; 84 85 if (!is_initialized) { 86 osif_err("invoked when not initialized"); 87 return NULL; 88 } 89 90 length = sizeof(*request) + params->priv_size; 91 request = qdf_mem_malloc(length); 92 if (!request) 93 return NULL; 94 95 request->reference_count = 1; 96 request->params = *params; 97 qdf_event_create(&request->completed); 98 qdf_spin_lock_bh(&spinlock); 99 request->cookie = cookie++; 100 qdf_list_insert_back(&requests, &request->node); 101 qdf_spin_unlock_bh(&spinlock); 102 osif_debug("request %pK, cookie %pK", request, request->cookie); 103 104 return request; 105 } 106 107 void *osif_request_priv(struct osif_request *request) 108 { 109 /* private data area immediately follows the struct osif_request */ 110 return request + 1; 111 } 112 113 void *osif_request_cookie(struct osif_request *request) 114 { 115 return request->cookie; 116 } 117 118 struct osif_request *osif_request_get(void *cookie) 119 { 120 struct osif_request *request; 121 122 if (!is_initialized) { 123 osif_err("invoked when not initialized"); 124 return NULL; 125 } 126 qdf_spin_lock_bh(&spinlock); 127 request = osif_request_find(cookie); 128 if (request) 129 request->reference_count++; 130 qdf_spin_unlock_bh(&spinlock); 131 osif_debug("cookie %pK, request %pK", cookie, request); 132 133 return request; 134 } 135 136 void osif_request_put(struct osif_request *request) 137 { 138 bool unlinked = false; 139 140 osif_debug("request %pK, cookie %pK", request, request->cookie); 141 qdf_spin_lock_bh(&spinlock); 142 request->reference_count--; 143 if (0 == request->reference_count) { 144 osif_request_unlink(request); 145 unlinked = true; 146 } 147 qdf_spin_unlock_bh(&spinlock); 148 if (unlinked) 149 osif_request_destroy(request); 150 } 151 152 int osif_request_wait_for_response(struct osif_request *request) 153 { 154 QDF_STATUS status; 155 156 status = qdf_wait_for_event_completion(&request->completed, 157 request->params.timeout_ms); 158 159 return qdf_status_to_os_return(status); 160 } 161 162 void osif_request_complete(struct osif_request *request) 163 { 164 (void) qdf_event_set(&request->completed); 165 } 166 167 void osif_request_manager_init(void) 168 { 169 if (is_initialized) 170 return; 171 172 qdf_list_create(&requests, MAX_NUM_REQUESTS); 173 qdf_spinlock_create(&spinlock); 174 is_initialized = true; 175 } 176 177 /* 178 * osif_request_manager_deinit implementation note: 179 * It is intentional that we do not destroy the list or the spinlock. 180 * This allows threads to still access the infrastructure even when it 181 * has been deinitialized. Since neither lists nor spinlocks consume 182 * resources this does not result in a resource leak. 183 */ 184 void osif_request_manager_deinit(void) 185 { 186 is_initialized = false; 187 } 188