Naveen Rawat | 685bf25 | 2018-04-05 11:56:36 -0700 | [diff] [blame] | 1 | /* |
Madhvapathi Sriram | 409d199 | 2019-01-07 09:25:15 +0530 | [diff] [blame] | 2 | * Copyright (c) 2017-2019 The Linux Foundation. All rights reserved. |
Naveen Rawat | 685bf25 | 2018-04-05 11:56:36 -0700 | [diff] [blame] | 3 | * |
Naveen Rawat | 685bf25 | 2018-04-05 11:56:36 -0700 | [diff] [blame] | 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 | |
Naveen Rawat | 685bf25 | 2018-04-05 11:56:36 -0700 | [diff] [blame] | 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) { |
Jeff Johnson | 23e2638 | 2019-06-11 13:42:26 -0700 | [diff] [blame] | 86 | osif_err("invoked when not initialized"); |
Naveen Rawat | 685bf25 | 2018-04-05 11:56:36 -0700 | [diff] [blame] | 87 | return NULL; |
| 88 | } |
| 89 | |
| 90 | length = sizeof(*request) + params->priv_size; |
| 91 | request = qdf_mem_malloc(length); |
Madhvapathi Sriram | 409d199 | 2019-01-07 09:25:15 +0530 | [diff] [blame] | 92 | if (!request) |
Naveen Rawat | 685bf25 | 2018-04-05 11:56:36 -0700 | [diff] [blame] | 93 | return NULL; |
Madhvapathi Sriram | 409d199 | 2019-01-07 09:25:15 +0530 | [diff] [blame] | 94 | |
Naveen Rawat | 685bf25 | 2018-04-05 11:56:36 -0700 | [diff] [blame] | 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); |
Jeff Johnson | 23e2638 | 2019-06-11 13:42:26 -0700 | [diff] [blame] | 102 | osif_debug("request %pK, cookie %pK", request, request->cookie); |
Naveen Rawat | 685bf25 | 2018-04-05 11:56:36 -0700 | [diff] [blame] | 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) { |
Jeff Johnson | 23e2638 | 2019-06-11 13:42:26 -0700 | [diff] [blame] | 123 | osif_err("invoked when not initialized"); |
Naveen Rawat | 685bf25 | 2018-04-05 11:56:36 -0700 | [diff] [blame] | 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); |
Jeff Johnson | 23e2638 | 2019-06-11 13:42:26 -0700 | [diff] [blame] | 131 | osif_debug("cookie %pK, request %pK", cookie, request); |
Naveen Rawat | 685bf25 | 2018-04-05 11:56:36 -0700 | [diff] [blame] | 132 | |
| 133 | return request; |
| 134 | } |
| 135 | |
| 136 | void osif_request_put(struct osif_request *request) |
| 137 | { |
| 138 | bool unlinked = false; |
| 139 | |
Jeff Johnson | 23e2638 | 2019-06-11 13:42:26 -0700 | [diff] [blame] | 140 | osif_debug("request %pK, cookie %pK", request, request->cookie); |
Naveen Rawat | 685bf25 | 2018-04-05 11:56:36 -0700 | [diff] [blame] | 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 | { |
Naveen Rawat | 685bf25 | 2018-04-05 11:56:36 -0700 | [diff] [blame] | 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 | { |
Naveen Rawat | 685bf25 | 2018-04-05 11:56:36 -0700 | [diff] [blame] | 186 | is_initialized = false; |
| 187 | } |