1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2020-21 Intel Corporation. 4 */ 5 6 #include "iosm_ipc_mux_codec.h" 7 8 /* At the begin of the runtime phase the IP MUX channel shall created. */ 9 static int ipc_mux_channel_create(struct iosm_mux *ipc_mux) 10 { 11 int channel_id; 12 13 channel_id = ipc_imem_channel_alloc(ipc_mux->imem, ipc_mux->instance_id, 14 IPC_CTYPE_WWAN); 15 16 if (channel_id < 0) { 17 dev_err(ipc_mux->dev, 18 "allocation of the MUX channel id failed"); 19 ipc_mux->state = MUX_S_ERROR; 20 ipc_mux->event = MUX_E_NOT_APPLICABLE; 21 goto no_channel; 22 } 23 24 /* Establish the MUX channel in blocking mode. */ 25 ipc_mux->channel = ipc_imem_channel_open(ipc_mux->imem, channel_id, 26 IPC_HP_NET_CHANNEL_INIT); 27 28 if (!ipc_mux->channel) { 29 dev_err(ipc_mux->dev, "ipc_imem_channel_open failed"); 30 ipc_mux->state = MUX_S_ERROR; 31 ipc_mux->event = MUX_E_NOT_APPLICABLE; 32 return -ENODEV; /* MUX channel is not available. */ 33 } 34 35 /* Define the MUX active state properties. */ 36 ipc_mux->state = MUX_S_ACTIVE; 37 ipc_mux->event = MUX_E_NO_ORDERS; 38 39 no_channel: 40 return channel_id; 41 } 42 43 /* Reset the session/if id state. */ 44 static void ipc_mux_session_free(struct iosm_mux *ipc_mux, int if_id) 45 { 46 struct mux_session *if_entry; 47 48 if_entry = &ipc_mux->session[if_id]; 49 /* Reset the session state. */ 50 if_entry->wwan = NULL; 51 } 52 53 /* Create and send the session open command. */ 54 static struct mux_cmd_open_session_resp * 55 ipc_mux_session_open_send(struct iosm_mux *ipc_mux, int if_id) 56 { 57 struct mux_cmd_open_session_resp *open_session_resp; 58 struct mux_acb *acb = &ipc_mux->acb; 59 union mux_cmd_param param; 60 61 /* open_session commands to one ACB and start transmission. */ 62 param.open_session.flow_ctrl = 0; 63 param.open_session.ipv4v6_hints = 0; 64 param.open_session.reserved2 = 0; 65 param.open_session.dl_head_pad_len = cpu_to_le32(IPC_MEM_DL_ETH_OFFSET); 66 67 /* Finish and transfer ACB. The user thread is suspended. 68 * It is a blocking function call, until CP responds or timeout. 69 */ 70 acb->wanted_response = MUX_CMD_OPEN_SESSION_RESP; 71 if (ipc_mux_dl_acb_send_cmds(ipc_mux, MUX_CMD_OPEN_SESSION, if_id, 0, 72 ¶m, sizeof(param.open_session), true, 73 false) || 74 acb->got_response != MUX_CMD_OPEN_SESSION_RESP) { 75 dev_err(ipc_mux->dev, "if_id %d: OPEN_SESSION send failed", 76 if_id); 77 return NULL; 78 } 79 80 open_session_resp = &ipc_mux->acb.got_param.open_session_resp; 81 if (open_session_resp->response != cpu_to_le32(MUX_CMD_RESP_SUCCESS)) { 82 dev_err(ipc_mux->dev, 83 "if_id %d,session open failed,response=%d", if_id, 84 open_session_resp->response); 85 return NULL; 86 } 87 88 return open_session_resp; 89 } 90 91 /* Open the first IP session. */ 92 static bool ipc_mux_session_open(struct iosm_mux *ipc_mux, 93 struct mux_session_open *session_open) 94 { 95 struct mux_cmd_open_session_resp *open_session_resp; 96 int if_id; 97 98 /* Search for a free session interface id. */ 99 if_id = le32_to_cpu(session_open->if_id); 100 if (if_id < 0 || if_id >= ipc_mux->nr_sessions) { 101 dev_err(ipc_mux->dev, "invalid interface id=%d", if_id); 102 return false; 103 } 104 105 /* Create and send the session open command. 106 * It is a blocking function call, until CP responds or timeout. 107 */ 108 open_session_resp = ipc_mux_session_open_send(ipc_mux, if_id); 109 if (!open_session_resp) { 110 ipc_mux_session_free(ipc_mux, if_id); 111 session_open->if_id = cpu_to_le32(-1); 112 return false; 113 } 114 115 /* Initialize the uplink skb accumulator. */ 116 skb_queue_head_init(&ipc_mux->session[if_id].ul_list); 117 118 ipc_mux->session[if_id].dl_head_pad_len = IPC_MEM_DL_ETH_OFFSET; 119 ipc_mux->session[if_id].ul_head_pad_len = 120 le32_to_cpu(open_session_resp->ul_head_pad_len); 121 ipc_mux->session[if_id].wwan = ipc_mux->wwan; 122 123 /* Reset the flow ctrl stats of the session */ 124 ipc_mux->session[if_id].flow_ctl_en_cnt = 0; 125 ipc_mux->session[if_id].flow_ctl_dis_cnt = 0; 126 ipc_mux->session[if_id].ul_flow_credits = 0; 127 ipc_mux->session[if_id].net_tx_stop = false; 128 ipc_mux->session[if_id].flow_ctl_mask = 0; 129 130 /* Save and return the assigned if id. */ 131 session_open->if_id = cpu_to_le32(if_id); 132 133 return true; 134 } 135 136 /* Free pending session UL packet. */ 137 static void ipc_mux_session_reset(struct iosm_mux *ipc_mux, int if_id) 138 { 139 /* Reset the session/if id state. */ 140 ipc_mux_session_free(ipc_mux, if_id); 141 142 /* Empty the uplink skb accumulator. */ 143 skb_queue_purge(&ipc_mux->session[if_id].ul_list); 144 } 145 146 static void ipc_mux_session_close(struct iosm_mux *ipc_mux, 147 struct mux_session_close *msg) 148 { 149 int if_id; 150 151 /* Copy the session interface id. */ 152 if_id = le32_to_cpu(msg->if_id); 153 154 if (if_id < 0 || if_id >= ipc_mux->nr_sessions) { 155 dev_err(ipc_mux->dev, "invalid session id %d", if_id); 156 return; 157 } 158 159 /* Create and send the session close command. 160 * It is a blocking function call, until CP responds or timeout. 161 */ 162 if (ipc_mux_dl_acb_send_cmds(ipc_mux, MUX_CMD_CLOSE_SESSION, if_id, 0, 163 NULL, 0, true, false)) 164 dev_err(ipc_mux->dev, "if_id %d: CLOSE_SESSION send failed", 165 if_id); 166 167 /* Reset the flow ctrl stats of the session */ 168 ipc_mux->session[if_id].flow_ctl_en_cnt = 0; 169 ipc_mux->session[if_id].flow_ctl_dis_cnt = 0; 170 ipc_mux->session[if_id].flow_ctl_mask = 0; 171 172 ipc_mux_session_reset(ipc_mux, if_id); 173 } 174 175 static void ipc_mux_channel_close(struct iosm_mux *ipc_mux, 176 struct mux_channel_close *channel_close_p) 177 { 178 int i; 179 180 /* Free pending session UL packet. */ 181 for (i = 0; i < ipc_mux->nr_sessions; i++) 182 if (ipc_mux->session[i].wwan) 183 ipc_mux_session_reset(ipc_mux, i); 184 185 ipc_imem_channel_close(ipc_mux->imem, ipc_mux->channel_id); 186 187 /* Reset the MUX object. */ 188 ipc_mux->state = MUX_S_INACTIVE; 189 ipc_mux->event = MUX_E_INACTIVE; 190 } 191 192 /* CP has interrupted AP. If AP is in IP MUX mode, execute the pending ops. */ 193 static int ipc_mux_schedule(struct iosm_mux *ipc_mux, union mux_msg *msg) 194 { 195 enum mux_event order; 196 bool success; 197 int ret = -EIO; 198 199 if (!ipc_mux->initialized) { 200 ret = -EAGAIN; 201 goto out; 202 } 203 204 order = msg->common.event; 205 206 switch (ipc_mux->state) { 207 case MUX_S_INACTIVE: 208 if (order != MUX_E_MUX_SESSION_OPEN) 209 goto out; /* Wait for the request to open a session */ 210 211 if (ipc_mux->event == MUX_E_INACTIVE) 212 /* Establish the MUX channel and the new state. */ 213 ipc_mux->channel_id = ipc_mux_channel_create(ipc_mux); 214 215 if (ipc_mux->state != MUX_S_ACTIVE) { 216 ret = ipc_mux->channel_id; /* Missing the MUX channel */ 217 goto out; 218 } 219 220 /* Disable the TD update timer and open the first IP session. */ 221 ipc_imem_td_update_timer_suspend(ipc_mux->imem, true); 222 ipc_mux->event = MUX_E_MUX_SESSION_OPEN; 223 success = ipc_mux_session_open(ipc_mux, &msg->session_open); 224 225 ipc_imem_td_update_timer_suspend(ipc_mux->imem, false); 226 if (success) 227 ret = ipc_mux->channel_id; 228 goto out; 229 230 case MUX_S_ACTIVE: 231 switch (order) { 232 case MUX_E_MUX_SESSION_OPEN: 233 /* Disable the TD update timer and open a session */ 234 ipc_imem_td_update_timer_suspend(ipc_mux->imem, true); 235 ipc_mux->event = MUX_E_MUX_SESSION_OPEN; 236 success = ipc_mux_session_open(ipc_mux, 237 &msg->session_open); 238 ipc_imem_td_update_timer_suspend(ipc_mux->imem, false); 239 if (success) 240 ret = ipc_mux->channel_id; 241 goto out; 242 243 case MUX_E_MUX_SESSION_CLOSE: 244 /* Release an IP session. */ 245 ipc_mux->event = MUX_E_MUX_SESSION_CLOSE; 246 ipc_mux_session_close(ipc_mux, &msg->session_close); 247 ret = ipc_mux->channel_id; 248 goto out; 249 250 case MUX_E_MUX_CHANNEL_CLOSE: 251 /* Close the MUX channel pipes. */ 252 ipc_mux->event = MUX_E_MUX_CHANNEL_CLOSE; 253 ipc_mux_channel_close(ipc_mux, &msg->channel_close); 254 ret = ipc_mux->channel_id; 255 goto out; 256 257 default: 258 /* Invalid order. */ 259 goto out; 260 } 261 262 default: 263 dev_err(ipc_mux->dev, 264 "unexpected MUX transition: state=%d, event=%d", 265 ipc_mux->state, ipc_mux->event); 266 } 267 out: 268 return ret; 269 } 270 271 struct iosm_mux *ipc_mux_init(struct ipc_mux_config *mux_cfg, 272 struct iosm_imem *imem) 273 { 274 struct iosm_mux *ipc_mux = kzalloc(sizeof(*ipc_mux), GFP_KERNEL); 275 int i, ul_tds, ul_td_size; 276 struct sk_buff_head *free_list; 277 struct sk_buff *skb; 278 279 if (!ipc_mux) 280 return NULL; 281 282 ipc_mux->protocol = mux_cfg->protocol; 283 ipc_mux->ul_flow = mux_cfg->ul_flow; 284 ipc_mux->nr_sessions = mux_cfg->nr_sessions; 285 ipc_mux->instance_id = mux_cfg->instance_id; 286 ipc_mux->wwan_q_offset = 0; 287 288 ipc_mux->pcie = imem->pcie; 289 ipc_mux->imem = imem; 290 ipc_mux->ipc_protocol = imem->ipc_protocol; 291 ipc_mux->dev = imem->dev; 292 ipc_mux->wwan = imem->wwan; 293 294 /* Get the reference to the UL ADB list. */ 295 free_list = &ipc_mux->ul_adb.free_list; 296 297 /* Initialize the list with free ADB. */ 298 skb_queue_head_init(free_list); 299 300 ul_td_size = IPC_MEM_MAX_DL_MUX_LITE_BUF_SIZE; 301 302 ul_tds = IPC_MEM_MAX_TDS_MUX_LITE_UL; 303 304 ipc_mux->ul_adb.dest_skb = NULL; 305 306 ipc_mux->initialized = true; 307 ipc_mux->adb_prep_ongoing = false; 308 ipc_mux->size_needed = 0; 309 ipc_mux->ul_data_pend_bytes = 0; 310 ipc_mux->state = MUX_S_INACTIVE; 311 ipc_mux->ev_mux_net_transmit_pending = false; 312 ipc_mux->tx_transaction_id = 0; 313 ipc_mux->rr_next_session = 0; 314 ipc_mux->event = MUX_E_INACTIVE; 315 ipc_mux->channel_id = -1; 316 ipc_mux->channel = NULL; 317 318 /* Allocate the list of UL ADB. */ 319 for (i = 0; i < ul_tds; i++) { 320 dma_addr_t mapping; 321 322 skb = ipc_pcie_alloc_skb(ipc_mux->pcie, ul_td_size, GFP_ATOMIC, 323 &mapping, DMA_TO_DEVICE, 0); 324 if (!skb) { 325 ipc_mux_deinit(ipc_mux); 326 return NULL; 327 } 328 /* Extend the UL ADB list. */ 329 skb_queue_tail(free_list, skb); 330 } 331 332 return ipc_mux; 333 } 334 335 /* Informs the network stack to restart transmission for all opened session if 336 * Flow Control is not ON for that session. 337 */ 338 static void ipc_mux_restart_tx_for_all_sessions(struct iosm_mux *ipc_mux) 339 { 340 struct mux_session *session; 341 int idx; 342 343 for (idx = 0; idx < ipc_mux->nr_sessions; idx++) { 344 session = &ipc_mux->session[idx]; 345 346 if (!session->wwan) 347 continue; 348 349 /* If flow control of the session is OFF and if there was tx 350 * stop then restart. Inform the network interface to restart 351 * sending data. 352 */ 353 if (session->flow_ctl_mask == 0) { 354 session->net_tx_stop = false; 355 ipc_mux_netif_tx_flowctrl(session, idx, false); 356 } 357 } 358 } 359 360 /* Informs the network stack to stop sending further pkt for all opened 361 * sessions 362 */ 363 static void ipc_mux_stop_netif_for_all_sessions(struct iosm_mux *ipc_mux) 364 { 365 struct mux_session *session; 366 int idx; 367 368 for (idx = 0; idx < ipc_mux->nr_sessions; idx++) { 369 session = &ipc_mux->session[idx]; 370 371 if (!session->wwan) 372 continue; 373 374 ipc_mux_netif_tx_flowctrl(session, session->if_id, true); 375 } 376 } 377 378 void ipc_mux_check_n_restart_tx(struct iosm_mux *ipc_mux) 379 { 380 if (ipc_mux->ul_flow == MUX_UL) { 381 int low_thresh = IPC_MEM_MUX_UL_FLOWCTRL_LOW_B; 382 383 if (ipc_mux->ul_data_pend_bytes < low_thresh) 384 ipc_mux_restart_tx_for_all_sessions(ipc_mux); 385 } 386 } 387 388 int ipc_mux_get_max_sessions(struct iosm_mux *ipc_mux) 389 { 390 return ipc_mux ? ipc_mux->nr_sessions : -EFAULT; 391 } 392 393 enum ipc_mux_protocol ipc_mux_get_active_protocol(struct iosm_mux *ipc_mux) 394 { 395 return ipc_mux ? ipc_mux->protocol : MUX_UNKNOWN; 396 } 397 398 int ipc_mux_open_session(struct iosm_mux *ipc_mux, int session_nr) 399 { 400 struct mux_session_open *session_open; 401 union mux_msg mux_msg; 402 403 session_open = &mux_msg.session_open; 404 session_open->event = MUX_E_MUX_SESSION_OPEN; 405 406 session_open->if_id = cpu_to_le32(session_nr); 407 ipc_mux->session[session_nr].flags |= IPC_MEM_WWAN_MUX; 408 return ipc_mux_schedule(ipc_mux, &mux_msg); 409 } 410 411 int ipc_mux_close_session(struct iosm_mux *ipc_mux, int session_nr) 412 { 413 struct mux_session_close *session_close; 414 union mux_msg mux_msg; 415 int ret_val; 416 417 session_close = &mux_msg.session_close; 418 session_close->event = MUX_E_MUX_SESSION_CLOSE; 419 420 session_close->if_id = cpu_to_le32(session_nr); 421 ret_val = ipc_mux_schedule(ipc_mux, &mux_msg); 422 ipc_mux->session[session_nr].flags &= ~IPC_MEM_WWAN_MUX; 423 424 return ret_val; 425 } 426 427 void ipc_mux_deinit(struct iosm_mux *ipc_mux) 428 { 429 struct mux_channel_close *channel_close; 430 struct sk_buff_head *free_list; 431 union mux_msg mux_msg; 432 struct sk_buff *skb; 433 434 if (!ipc_mux->initialized) 435 return; 436 ipc_mux_stop_netif_for_all_sessions(ipc_mux); 437 438 channel_close = &mux_msg.channel_close; 439 channel_close->event = MUX_E_MUX_CHANNEL_CLOSE; 440 ipc_mux_schedule(ipc_mux, &mux_msg); 441 442 /* Empty the ADB free list. */ 443 free_list = &ipc_mux->ul_adb.free_list; 444 445 /* Remove from the head of the downlink queue. */ 446 while ((skb = skb_dequeue(free_list))) 447 ipc_pcie_kfree_skb(ipc_mux->pcie, skb); 448 449 if (ipc_mux->channel) { 450 ipc_mux->channel->ul_pipe.is_open = false; 451 ipc_mux->channel->dl_pipe.is_open = false; 452 } 453 454 kfree(ipc_mux); 455 } 456