1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2021, MediaTek Inc. 4 * Copyright (c) 2021-2022, Intel Corporation. 5 * 6 * Authors: 7 * Amir Hanania <amir.hanania@intel.com> 8 * Haijun Liu <haijun.liu@mediatek.com> 9 * Moises Veleta <moises.veleta@intel.com> 10 * Ricardo Martinez <ricardo.martinez@linux.intel.com> 11 * 12 * Contributors: 13 * Andy Shevchenko <andriy.shevchenko@linux.intel.com> 14 * Chandrashekar Devegowda <chandrashekar.devegowda@intel.com> 15 * Chiranjeevi Rapolu <chiranjeevi.rapolu@intel.com> 16 * Eliot Lee <eliot.lee@intel.com> 17 * Sreehari Kancharla <sreehari.kancharla@intel.com> 18 */ 19 20 #include <linux/bits.h> 21 #include <linux/bitfield.h> 22 #include <linux/device.h> 23 #include <linux/gfp.h> 24 #include <linux/kernel.h> 25 #include <linux/kthread.h> 26 #include <linux/list.h> 27 #include <linux/mutex.h> 28 #include <linux/netdevice.h> 29 #include <linux/skbuff.h> 30 #include <linux/spinlock.h> 31 #include <linux/wait.h> 32 #include <linux/wwan.h> 33 34 #include "t7xx_hif_cldma.h" 35 #include "t7xx_modem_ops.h" 36 #include "t7xx_port.h" 37 #include "t7xx_port_proxy.h" 38 #include "t7xx_state_monitor.h" 39 40 #define Q_IDX_CTRL 0 41 #define Q_IDX_MBIM 2 42 #define Q_IDX_AT_CMD 5 43 44 #define INVALID_SEQ_NUM GENMASK(15, 0) 45 46 #define for_each_proxy_port(i, p, proxy) \ 47 for (i = 0, (p) = &(proxy)->ports[i]; \ 48 i < (proxy)->port_count; \ 49 i++, (p) = &(proxy)->ports[i]) 50 51 static const struct t7xx_port_conf t7xx_md_port_conf[] = { 52 { 53 .tx_ch = PORT_CH_UART2_TX, 54 .rx_ch = PORT_CH_UART2_RX, 55 .txq_index = Q_IDX_AT_CMD, 56 .rxq_index = Q_IDX_AT_CMD, 57 .txq_exp_index = 0xff, 58 .rxq_exp_index = 0xff, 59 .path_id = CLDMA_ID_MD, 60 .ops = &wwan_sub_port_ops, 61 .name = "AT", 62 .port_type = WWAN_PORT_AT, 63 }, { 64 .tx_ch = PORT_CH_MBIM_TX, 65 .rx_ch = PORT_CH_MBIM_RX, 66 .txq_index = Q_IDX_MBIM, 67 .rxq_index = Q_IDX_MBIM, 68 .path_id = CLDMA_ID_MD, 69 .ops = &wwan_sub_port_ops, 70 .name = "MBIM", 71 .port_type = WWAN_PORT_MBIM, 72 }, { 73 #ifdef CONFIG_WWAN_DEBUGFS 74 .tx_ch = PORT_CH_MD_LOG_TX, 75 .rx_ch = PORT_CH_MD_LOG_RX, 76 .txq_index = 7, 77 .rxq_index = 7, 78 .txq_exp_index = 7, 79 .rxq_exp_index = 7, 80 .path_id = CLDMA_ID_MD, 81 .ops = &t7xx_trace_port_ops, 82 .name = "mdlog", 83 }, { 84 #endif 85 .tx_ch = PORT_CH_CONTROL_TX, 86 .rx_ch = PORT_CH_CONTROL_RX, 87 .txq_index = Q_IDX_CTRL, 88 .rxq_index = Q_IDX_CTRL, 89 .path_id = CLDMA_ID_MD, 90 .ops = &ctl_port_ops, 91 .name = "t7xx_ctrl", 92 }, 93 }; 94 95 static struct t7xx_port *t7xx_proxy_get_port_by_ch(struct port_proxy *port_prox, enum port_ch ch) 96 { 97 const struct t7xx_port_conf *port_conf; 98 struct t7xx_port *port; 99 int i; 100 101 for_each_proxy_port(i, port, port_prox) { 102 port_conf = port->port_conf; 103 if (port_conf->rx_ch == ch || port_conf->tx_ch == ch) 104 return port; 105 } 106 107 return NULL; 108 } 109 110 static u16 t7xx_port_next_rx_seq_num(struct t7xx_port *port, struct ccci_header *ccci_h) 111 { 112 u32 status = le32_to_cpu(ccci_h->status); 113 u16 seq_num, next_seq_num; 114 bool assert_bit; 115 116 seq_num = FIELD_GET(CCCI_H_SEQ_FLD, status); 117 next_seq_num = (seq_num + 1) & FIELD_MAX(CCCI_H_SEQ_FLD); 118 assert_bit = status & CCCI_H_AST_BIT; 119 if (!assert_bit || port->seq_nums[MTK_RX] == INVALID_SEQ_NUM) 120 return next_seq_num; 121 122 if (seq_num != port->seq_nums[MTK_RX]) 123 dev_warn_ratelimited(port->dev, 124 "seq num out-of-order %u != %u (header %X, len %X)\n", 125 seq_num, port->seq_nums[MTK_RX], 126 le32_to_cpu(ccci_h->packet_header), 127 le32_to_cpu(ccci_h->packet_len)); 128 129 return next_seq_num; 130 } 131 132 void t7xx_port_proxy_reset(struct port_proxy *port_prox) 133 { 134 struct t7xx_port *port; 135 int i; 136 137 for_each_proxy_port(i, port, port_prox) { 138 port->seq_nums[MTK_RX] = INVALID_SEQ_NUM; 139 port->seq_nums[MTK_TX] = 0; 140 } 141 } 142 143 static int t7xx_port_get_queue_no(struct t7xx_port *port) 144 { 145 const struct t7xx_port_conf *port_conf = port->port_conf; 146 struct t7xx_fsm_ctl *ctl = port->t7xx_dev->md->fsm_ctl; 147 148 return t7xx_fsm_get_md_state(ctl) == MD_STATE_EXCEPTION ? 149 port_conf->txq_exp_index : port_conf->txq_index; 150 } 151 152 static void t7xx_port_struct_init(struct t7xx_port *port) 153 { 154 INIT_LIST_HEAD(&port->entry); 155 INIT_LIST_HEAD(&port->queue_entry); 156 skb_queue_head_init(&port->rx_skb_list); 157 init_waitqueue_head(&port->rx_wq); 158 port->seq_nums[MTK_RX] = INVALID_SEQ_NUM; 159 port->seq_nums[MTK_TX] = 0; 160 atomic_set(&port->usage_cnt, 0); 161 } 162 163 struct sk_buff *t7xx_port_alloc_skb(int payload) 164 { 165 struct sk_buff *skb = __dev_alloc_skb(payload + sizeof(struct ccci_header), GFP_KERNEL); 166 167 if (skb) 168 skb_reserve(skb, sizeof(struct ccci_header)); 169 170 return skb; 171 } 172 173 struct sk_buff *t7xx_ctrl_alloc_skb(int payload) 174 { 175 struct sk_buff *skb = t7xx_port_alloc_skb(payload + sizeof(struct ctrl_msg_header)); 176 177 if (skb) 178 skb_reserve(skb, sizeof(struct ctrl_msg_header)); 179 180 return skb; 181 } 182 183 /** 184 * t7xx_port_enqueue_skb() - Enqueue the received skb into the port's rx_skb_list. 185 * @port: port context. 186 * @skb: received skb. 187 * 188 * Return: 189 * * 0 - Success. 190 * * -ENOBUFS - Not enough buffer space. Caller will try again later, skb is not consumed. 191 */ 192 int t7xx_port_enqueue_skb(struct t7xx_port *port, struct sk_buff *skb) 193 { 194 unsigned long flags; 195 196 spin_lock_irqsave(&port->rx_wq.lock, flags); 197 if (port->rx_skb_list.qlen >= port->rx_length_th) { 198 spin_unlock_irqrestore(&port->rx_wq.lock, flags); 199 200 return -ENOBUFS; 201 } 202 __skb_queue_tail(&port->rx_skb_list, skb); 203 spin_unlock_irqrestore(&port->rx_wq.lock, flags); 204 205 wake_up_all(&port->rx_wq); 206 return 0; 207 } 208 209 static int t7xx_port_send_raw_skb(struct t7xx_port *port, struct sk_buff *skb) 210 { 211 enum cldma_id path_id = port->port_conf->path_id; 212 struct cldma_ctrl *md_ctrl; 213 int ret, tx_qno; 214 215 md_ctrl = port->t7xx_dev->md->md_ctrl[path_id]; 216 tx_qno = t7xx_port_get_queue_no(port); 217 ret = t7xx_cldma_send_skb(md_ctrl, tx_qno, skb); 218 if (ret) 219 dev_err(port->dev, "Failed to send skb: %d\n", ret); 220 221 return ret; 222 } 223 224 static int t7xx_port_send_ccci_skb(struct t7xx_port *port, struct sk_buff *skb, 225 unsigned int pkt_header, unsigned int ex_msg) 226 { 227 const struct t7xx_port_conf *port_conf = port->port_conf; 228 struct ccci_header *ccci_h; 229 u32 status; 230 int ret; 231 232 ccci_h = skb_push(skb, sizeof(*ccci_h)); 233 status = FIELD_PREP(CCCI_H_CHN_FLD, port_conf->tx_ch) | 234 FIELD_PREP(CCCI_H_SEQ_FLD, port->seq_nums[MTK_TX]) | CCCI_H_AST_BIT; 235 ccci_h->status = cpu_to_le32(status); 236 ccci_h->packet_header = cpu_to_le32(pkt_header); 237 ccci_h->packet_len = cpu_to_le32(skb->len); 238 ccci_h->ex_msg = cpu_to_le32(ex_msg); 239 240 ret = t7xx_port_send_raw_skb(port, skb); 241 if (ret) 242 return ret; 243 244 port->seq_nums[MTK_TX]++; 245 return 0; 246 } 247 248 int t7xx_port_send_ctl_skb(struct t7xx_port *port, struct sk_buff *skb, unsigned int msg, 249 unsigned int ex_msg) 250 { 251 struct ctrl_msg_header *ctrl_msg_h; 252 unsigned int msg_len = skb->len; 253 u32 pkt_header = 0; 254 255 ctrl_msg_h = skb_push(skb, sizeof(*ctrl_msg_h)); 256 ctrl_msg_h->ctrl_msg_id = cpu_to_le32(msg); 257 ctrl_msg_h->ex_msg = cpu_to_le32(ex_msg); 258 ctrl_msg_h->data_length = cpu_to_le32(msg_len); 259 260 if (!msg_len) 261 pkt_header = CCCI_HEADER_NO_DATA; 262 263 return t7xx_port_send_ccci_skb(port, skb, pkt_header, ex_msg); 264 } 265 266 int t7xx_port_send_skb(struct t7xx_port *port, struct sk_buff *skb, unsigned int pkt_header, 267 unsigned int ex_msg) 268 { 269 struct t7xx_fsm_ctl *ctl = port->t7xx_dev->md->fsm_ctl; 270 unsigned int fsm_state; 271 272 fsm_state = t7xx_fsm_get_ctl_state(ctl); 273 if (fsm_state != FSM_STATE_PRE_START) { 274 const struct t7xx_port_conf *port_conf = port->port_conf; 275 enum md_state md_state = t7xx_fsm_get_md_state(ctl); 276 277 switch (md_state) { 278 case MD_STATE_EXCEPTION: 279 if (port_conf->tx_ch != PORT_CH_MD_LOG_TX) 280 return -EBUSY; 281 break; 282 283 case MD_STATE_WAITING_FOR_HS1: 284 case MD_STATE_WAITING_FOR_HS2: 285 case MD_STATE_STOPPED: 286 case MD_STATE_WAITING_TO_STOP: 287 case MD_STATE_INVALID: 288 return -ENODEV; 289 290 default: 291 break; 292 } 293 } 294 295 return t7xx_port_send_ccci_skb(port, skb, pkt_header, ex_msg); 296 } 297 298 static void t7xx_proxy_setup_ch_mapping(struct port_proxy *port_prox) 299 { 300 struct t7xx_port *port; 301 302 int i, j; 303 304 for (i = 0; i < ARRAY_SIZE(port_prox->rx_ch_ports); i++) 305 INIT_LIST_HEAD(&port_prox->rx_ch_ports[i]); 306 307 for (j = 0; j < ARRAY_SIZE(port_prox->queue_ports); j++) { 308 for (i = 0; i < ARRAY_SIZE(port_prox->queue_ports[j]); i++) 309 INIT_LIST_HEAD(&port_prox->queue_ports[j][i]); 310 } 311 312 for_each_proxy_port(i, port, port_prox) { 313 const struct t7xx_port_conf *port_conf = port->port_conf; 314 enum cldma_id path_id = port_conf->path_id; 315 u8 ch_id; 316 317 ch_id = FIELD_GET(PORT_CH_ID_MASK, port_conf->rx_ch); 318 list_add_tail(&port->entry, &port_prox->rx_ch_ports[ch_id]); 319 list_add_tail(&port->queue_entry, 320 &port_prox->queue_ports[path_id][port_conf->rxq_index]); 321 } 322 } 323 324 static struct t7xx_port *t7xx_port_proxy_find_port(struct t7xx_pci_dev *t7xx_dev, 325 struct cldma_queue *queue, u16 channel) 326 { 327 struct port_proxy *port_prox = t7xx_dev->md->port_prox; 328 struct list_head *port_list; 329 struct t7xx_port *port; 330 u8 ch_id; 331 332 ch_id = FIELD_GET(PORT_CH_ID_MASK, channel); 333 port_list = &port_prox->rx_ch_ports[ch_id]; 334 list_for_each_entry(port, port_list, entry) { 335 const struct t7xx_port_conf *port_conf = port->port_conf; 336 337 if (queue->md_ctrl->hif_id == port_conf->path_id && 338 channel == port_conf->rx_ch) 339 return port; 340 } 341 342 return NULL; 343 } 344 345 /** 346 * t7xx_port_proxy_recv_skb() - Dispatch received skb. 347 * @queue: CLDMA queue. 348 * @skb: Socket buffer. 349 * 350 * Return: 351 ** 0 - Packet consumed. 352 ** -ERROR - Failed to process skb. 353 */ 354 static int t7xx_port_proxy_recv_skb(struct cldma_queue *queue, struct sk_buff *skb) 355 { 356 struct ccci_header *ccci_h = (struct ccci_header *)skb->data; 357 struct t7xx_pci_dev *t7xx_dev = queue->md_ctrl->t7xx_dev; 358 struct t7xx_fsm_ctl *ctl = t7xx_dev->md->fsm_ctl; 359 struct device *dev = queue->md_ctrl->dev; 360 const struct t7xx_port_conf *port_conf; 361 struct t7xx_port *port; 362 u16 seq_num, channel; 363 int ret; 364 365 channel = FIELD_GET(CCCI_H_CHN_FLD, le32_to_cpu(ccci_h->status)); 366 if (t7xx_fsm_get_md_state(ctl) == MD_STATE_INVALID) { 367 dev_err_ratelimited(dev, "Packet drop on channel 0x%x, modem not ready\n", channel); 368 goto drop_skb; 369 } 370 371 port = t7xx_port_proxy_find_port(t7xx_dev, queue, channel); 372 if (!port) { 373 dev_err_ratelimited(dev, "Packet drop on channel 0x%x, port not found\n", channel); 374 goto drop_skb; 375 } 376 377 seq_num = t7xx_port_next_rx_seq_num(port, ccci_h); 378 port_conf = port->port_conf; 379 skb_pull(skb, sizeof(*ccci_h)); 380 381 ret = port_conf->ops->recv_skb(port, skb); 382 /* Error indicates to try again later */ 383 if (ret) { 384 skb_push(skb, sizeof(*ccci_h)); 385 return ret; 386 } 387 388 port->seq_nums[MTK_RX] = seq_num; 389 return 0; 390 391 drop_skb: 392 dev_kfree_skb_any(skb); 393 return 0; 394 } 395 396 /** 397 * t7xx_port_proxy_md_status_notify() - Notify all ports of state. 398 *@port_prox: The port_proxy pointer. 399 *@state: State. 400 * 401 * Called by t7xx_fsm. Used to dispatch modem status for all ports, 402 * which want to know MD state transition. 403 */ 404 void t7xx_port_proxy_md_status_notify(struct port_proxy *port_prox, unsigned int state) 405 { 406 struct t7xx_port *port; 407 int i; 408 409 for_each_proxy_port(i, port, port_prox) { 410 const struct t7xx_port_conf *port_conf = port->port_conf; 411 412 if (port_conf->ops->md_state_notify) 413 port_conf->ops->md_state_notify(port, state); 414 } 415 } 416 417 static void t7xx_proxy_init_all_ports(struct t7xx_modem *md) 418 { 419 struct port_proxy *port_prox = md->port_prox; 420 struct t7xx_port *port; 421 int i; 422 423 for_each_proxy_port(i, port, port_prox) { 424 const struct t7xx_port_conf *port_conf = port->port_conf; 425 426 t7xx_port_struct_init(port); 427 428 if (port_conf->tx_ch == PORT_CH_CONTROL_TX) 429 md->core_md.ctl_port = port; 430 431 port->t7xx_dev = md->t7xx_dev; 432 port->dev = &md->t7xx_dev->pdev->dev; 433 spin_lock_init(&port->port_update_lock); 434 port->chan_enable = false; 435 436 if (port_conf->ops->init) 437 port_conf->ops->init(port); 438 } 439 440 t7xx_proxy_setup_ch_mapping(port_prox); 441 } 442 443 static int t7xx_proxy_alloc(struct t7xx_modem *md) 444 { 445 unsigned int port_count = ARRAY_SIZE(t7xx_md_port_conf); 446 struct device *dev = &md->t7xx_dev->pdev->dev; 447 struct port_proxy *port_prox; 448 int i; 449 450 port_prox = devm_kzalloc(dev, sizeof(*port_prox) + sizeof(struct t7xx_port) * port_count, 451 GFP_KERNEL); 452 if (!port_prox) 453 return -ENOMEM; 454 455 md->port_prox = port_prox; 456 port_prox->dev = dev; 457 458 for (i = 0; i < port_count; i++) 459 port_prox->ports[i].port_conf = &t7xx_md_port_conf[i]; 460 461 port_prox->port_count = port_count; 462 t7xx_proxy_init_all_ports(md); 463 return 0; 464 } 465 466 /** 467 * t7xx_port_proxy_init() - Initialize ports. 468 * @md: Modem. 469 * 470 * Create all port instances. 471 * 472 * Return: 473 * * 0 - Success. 474 * * -ERROR - Error code from failure sub-initializations. 475 */ 476 int t7xx_port_proxy_init(struct t7xx_modem *md) 477 { 478 int ret; 479 480 ret = t7xx_proxy_alloc(md); 481 if (ret) 482 return ret; 483 484 t7xx_cldma_set_recv_skb(md->md_ctrl[CLDMA_ID_MD], t7xx_port_proxy_recv_skb); 485 return 0; 486 } 487 488 void t7xx_port_proxy_uninit(struct port_proxy *port_prox) 489 { 490 struct t7xx_port *port; 491 int i; 492 493 for_each_proxy_port(i, port, port_prox) { 494 const struct t7xx_port_conf *port_conf = port->port_conf; 495 496 if (port_conf->ops->uninit) 497 port_conf->ops->uninit(port); 498 } 499 } 500 501 int t7xx_port_proxy_chl_enable_disable(struct port_proxy *port_prox, unsigned int ch_id, 502 bool en_flag) 503 { 504 struct t7xx_port *port = t7xx_proxy_get_port_by_ch(port_prox, ch_id); 505 const struct t7xx_port_conf *port_conf; 506 507 if (!port) 508 return -EINVAL; 509 510 port_conf = port->port_conf; 511 512 if (en_flag) { 513 if (port_conf->ops->enable_chl) 514 port_conf->ops->enable_chl(port); 515 } else { 516 if (port_conf->ops->disable_chl) 517 port_conf->ops->disable_chl(port); 518 } 519 520 return 0; 521 } 522