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 .tx_ch = PORT_CH_CONTROL_TX, 74 .rx_ch = PORT_CH_CONTROL_RX, 75 .txq_index = Q_IDX_CTRL, 76 .rxq_index = Q_IDX_CTRL, 77 .path_id = CLDMA_ID_MD, 78 .ops = &ctl_port_ops, 79 .name = "t7xx_ctrl", 80 }, 81 }; 82 83 static struct t7xx_port *t7xx_proxy_get_port_by_ch(struct port_proxy *port_prox, enum port_ch ch) 84 { 85 const struct t7xx_port_conf *port_conf; 86 struct t7xx_port *port; 87 int i; 88 89 for_each_proxy_port(i, port, port_prox) { 90 port_conf = port->port_conf; 91 if (port_conf->rx_ch == ch || port_conf->tx_ch == ch) 92 return port; 93 } 94 95 return NULL; 96 } 97 98 static u16 t7xx_port_next_rx_seq_num(struct t7xx_port *port, struct ccci_header *ccci_h) 99 { 100 u32 status = le32_to_cpu(ccci_h->status); 101 u16 seq_num, next_seq_num; 102 bool assert_bit; 103 104 seq_num = FIELD_GET(CCCI_H_SEQ_FLD, status); 105 next_seq_num = (seq_num + 1) & FIELD_MAX(CCCI_H_SEQ_FLD); 106 assert_bit = status & CCCI_H_AST_BIT; 107 if (!assert_bit || port->seq_nums[MTK_RX] == INVALID_SEQ_NUM) 108 return next_seq_num; 109 110 if (seq_num != port->seq_nums[MTK_RX]) 111 dev_warn_ratelimited(port->dev, 112 "seq num out-of-order %u != %u (header %X, len %X)\n", 113 seq_num, port->seq_nums[MTK_RX], 114 le32_to_cpu(ccci_h->packet_header), 115 le32_to_cpu(ccci_h->packet_len)); 116 117 return next_seq_num; 118 } 119 120 void t7xx_port_proxy_reset(struct port_proxy *port_prox) 121 { 122 struct t7xx_port *port; 123 int i; 124 125 for_each_proxy_port(i, port, port_prox) { 126 port->seq_nums[MTK_RX] = INVALID_SEQ_NUM; 127 port->seq_nums[MTK_TX] = 0; 128 } 129 } 130 131 static int t7xx_port_get_queue_no(struct t7xx_port *port) 132 { 133 const struct t7xx_port_conf *port_conf = port->port_conf; 134 struct t7xx_fsm_ctl *ctl = port->t7xx_dev->md->fsm_ctl; 135 136 return t7xx_fsm_get_md_state(ctl) == MD_STATE_EXCEPTION ? 137 port_conf->txq_exp_index : port_conf->txq_index; 138 } 139 140 static void t7xx_port_struct_init(struct t7xx_port *port) 141 { 142 INIT_LIST_HEAD(&port->entry); 143 INIT_LIST_HEAD(&port->queue_entry); 144 skb_queue_head_init(&port->rx_skb_list); 145 init_waitqueue_head(&port->rx_wq); 146 port->seq_nums[MTK_RX] = INVALID_SEQ_NUM; 147 port->seq_nums[MTK_TX] = 0; 148 atomic_set(&port->usage_cnt, 0); 149 } 150 151 struct sk_buff *t7xx_port_alloc_skb(int payload) 152 { 153 struct sk_buff *skb = __dev_alloc_skb(payload + sizeof(struct ccci_header), GFP_KERNEL); 154 155 if (skb) 156 skb_reserve(skb, sizeof(struct ccci_header)); 157 158 return skb; 159 } 160 161 struct sk_buff *t7xx_ctrl_alloc_skb(int payload) 162 { 163 struct sk_buff *skb = t7xx_port_alloc_skb(payload + sizeof(struct ctrl_msg_header)); 164 165 if (skb) 166 skb_reserve(skb, sizeof(struct ctrl_msg_header)); 167 168 return skb; 169 } 170 171 /** 172 * t7xx_port_enqueue_skb() - Enqueue the received skb into the port's rx_skb_list. 173 * @port: port context. 174 * @skb: received skb. 175 * 176 * Return: 177 * * 0 - Success. 178 * * -ENOBUFS - Not enough buffer space. Caller will try again later, skb is not consumed. 179 */ 180 int t7xx_port_enqueue_skb(struct t7xx_port *port, struct sk_buff *skb) 181 { 182 unsigned long flags; 183 184 spin_lock_irqsave(&port->rx_wq.lock, flags); 185 if (port->rx_skb_list.qlen >= port->rx_length_th) { 186 spin_unlock_irqrestore(&port->rx_wq.lock, flags); 187 188 return -ENOBUFS; 189 } 190 __skb_queue_tail(&port->rx_skb_list, skb); 191 spin_unlock_irqrestore(&port->rx_wq.lock, flags); 192 193 wake_up_all(&port->rx_wq); 194 return 0; 195 } 196 197 static int t7xx_port_send_raw_skb(struct t7xx_port *port, struct sk_buff *skb) 198 { 199 enum cldma_id path_id = port->port_conf->path_id; 200 struct cldma_ctrl *md_ctrl; 201 int ret, tx_qno; 202 203 md_ctrl = port->t7xx_dev->md->md_ctrl[path_id]; 204 tx_qno = t7xx_port_get_queue_no(port); 205 ret = t7xx_cldma_send_skb(md_ctrl, tx_qno, skb); 206 if (ret) 207 dev_err(port->dev, "Failed to send skb: %d\n", ret); 208 209 return ret; 210 } 211 212 static int t7xx_port_send_ccci_skb(struct t7xx_port *port, struct sk_buff *skb, 213 unsigned int pkt_header, unsigned int ex_msg) 214 { 215 const struct t7xx_port_conf *port_conf = port->port_conf; 216 struct ccci_header *ccci_h; 217 u32 status; 218 int ret; 219 220 ccci_h = skb_push(skb, sizeof(*ccci_h)); 221 status = FIELD_PREP(CCCI_H_CHN_FLD, port_conf->tx_ch) | 222 FIELD_PREP(CCCI_H_SEQ_FLD, port->seq_nums[MTK_TX]) | CCCI_H_AST_BIT; 223 ccci_h->status = cpu_to_le32(status); 224 ccci_h->packet_header = cpu_to_le32(pkt_header); 225 ccci_h->packet_len = cpu_to_le32(skb->len); 226 ccci_h->ex_msg = cpu_to_le32(ex_msg); 227 228 ret = t7xx_port_send_raw_skb(port, skb); 229 if (ret) 230 return ret; 231 232 port->seq_nums[MTK_TX]++; 233 return 0; 234 } 235 236 int t7xx_port_send_ctl_skb(struct t7xx_port *port, struct sk_buff *skb, unsigned int msg, 237 unsigned int ex_msg) 238 { 239 struct ctrl_msg_header *ctrl_msg_h; 240 unsigned int msg_len = skb->len; 241 u32 pkt_header = 0; 242 243 ctrl_msg_h = skb_push(skb, sizeof(*ctrl_msg_h)); 244 ctrl_msg_h->ctrl_msg_id = cpu_to_le32(msg); 245 ctrl_msg_h->ex_msg = cpu_to_le32(ex_msg); 246 ctrl_msg_h->data_length = cpu_to_le32(msg_len); 247 248 if (!msg_len) 249 pkt_header = CCCI_HEADER_NO_DATA; 250 251 return t7xx_port_send_ccci_skb(port, skb, pkt_header, ex_msg); 252 } 253 254 int t7xx_port_send_skb(struct t7xx_port *port, struct sk_buff *skb, unsigned int pkt_header, 255 unsigned int ex_msg) 256 { 257 struct t7xx_fsm_ctl *ctl = port->t7xx_dev->md->fsm_ctl; 258 unsigned int fsm_state; 259 260 fsm_state = t7xx_fsm_get_ctl_state(ctl); 261 if (fsm_state != FSM_STATE_PRE_START) { 262 const struct t7xx_port_conf *port_conf = port->port_conf; 263 enum md_state md_state = t7xx_fsm_get_md_state(ctl); 264 265 switch (md_state) { 266 case MD_STATE_EXCEPTION: 267 if (port_conf->tx_ch != PORT_CH_MD_LOG_TX) 268 return -EBUSY; 269 break; 270 271 case MD_STATE_WAITING_FOR_HS1: 272 case MD_STATE_WAITING_FOR_HS2: 273 case MD_STATE_STOPPED: 274 case MD_STATE_WAITING_TO_STOP: 275 case MD_STATE_INVALID: 276 return -ENODEV; 277 278 default: 279 break; 280 } 281 } 282 283 return t7xx_port_send_ccci_skb(port, skb, pkt_header, ex_msg); 284 } 285 286 static void t7xx_proxy_setup_ch_mapping(struct port_proxy *port_prox) 287 { 288 struct t7xx_port *port; 289 290 int i, j; 291 292 for (i = 0; i < ARRAY_SIZE(port_prox->rx_ch_ports); i++) 293 INIT_LIST_HEAD(&port_prox->rx_ch_ports[i]); 294 295 for (j = 0; j < ARRAY_SIZE(port_prox->queue_ports); j++) { 296 for (i = 0; i < ARRAY_SIZE(port_prox->queue_ports[j]); i++) 297 INIT_LIST_HEAD(&port_prox->queue_ports[j][i]); 298 } 299 300 for_each_proxy_port(i, port, port_prox) { 301 const struct t7xx_port_conf *port_conf = port->port_conf; 302 enum cldma_id path_id = port_conf->path_id; 303 u8 ch_id; 304 305 ch_id = FIELD_GET(PORT_CH_ID_MASK, port_conf->rx_ch); 306 list_add_tail(&port->entry, &port_prox->rx_ch_ports[ch_id]); 307 list_add_tail(&port->queue_entry, 308 &port_prox->queue_ports[path_id][port_conf->rxq_index]); 309 } 310 } 311 312 static struct t7xx_port *t7xx_port_proxy_find_port(struct t7xx_pci_dev *t7xx_dev, 313 struct cldma_queue *queue, u16 channel) 314 { 315 struct port_proxy *port_prox = t7xx_dev->md->port_prox; 316 struct list_head *port_list; 317 struct t7xx_port *port; 318 u8 ch_id; 319 320 ch_id = FIELD_GET(PORT_CH_ID_MASK, channel); 321 port_list = &port_prox->rx_ch_ports[ch_id]; 322 list_for_each_entry(port, port_list, entry) { 323 const struct t7xx_port_conf *port_conf = port->port_conf; 324 325 if (queue->md_ctrl->hif_id == port_conf->path_id && 326 channel == port_conf->rx_ch) 327 return port; 328 } 329 330 return NULL; 331 } 332 333 /** 334 * t7xx_port_proxy_recv_skb() - Dispatch received skb. 335 * @queue: CLDMA queue. 336 * @skb: Socket buffer. 337 * 338 * Return: 339 ** 0 - Packet consumed. 340 ** -ERROR - Failed to process skb. 341 */ 342 static int t7xx_port_proxy_recv_skb(struct cldma_queue *queue, struct sk_buff *skb) 343 { 344 struct ccci_header *ccci_h = (struct ccci_header *)skb->data; 345 struct t7xx_pci_dev *t7xx_dev = queue->md_ctrl->t7xx_dev; 346 struct t7xx_fsm_ctl *ctl = t7xx_dev->md->fsm_ctl; 347 struct device *dev = queue->md_ctrl->dev; 348 const struct t7xx_port_conf *port_conf; 349 struct t7xx_port *port; 350 u16 seq_num, channel; 351 int ret; 352 353 channel = FIELD_GET(CCCI_H_CHN_FLD, le32_to_cpu(ccci_h->status)); 354 if (t7xx_fsm_get_md_state(ctl) == MD_STATE_INVALID) { 355 dev_err_ratelimited(dev, "Packet drop on channel 0x%x, modem not ready\n", channel); 356 goto drop_skb; 357 } 358 359 port = t7xx_port_proxy_find_port(t7xx_dev, queue, channel); 360 if (!port) { 361 dev_err_ratelimited(dev, "Packet drop on channel 0x%x, port not found\n", channel); 362 goto drop_skb; 363 } 364 365 seq_num = t7xx_port_next_rx_seq_num(port, ccci_h); 366 port_conf = port->port_conf; 367 skb_pull(skb, sizeof(*ccci_h)); 368 369 ret = port_conf->ops->recv_skb(port, skb); 370 /* Error indicates to try again later */ 371 if (ret) { 372 skb_push(skb, sizeof(*ccci_h)); 373 return ret; 374 } 375 376 port->seq_nums[MTK_RX] = seq_num; 377 return 0; 378 379 drop_skb: 380 dev_kfree_skb_any(skb); 381 return 0; 382 } 383 384 /** 385 * t7xx_port_proxy_md_status_notify() - Notify all ports of state. 386 *@port_prox: The port_proxy pointer. 387 *@state: State. 388 * 389 * Called by t7xx_fsm. Used to dispatch modem status for all ports, 390 * which want to know MD state transition. 391 */ 392 void t7xx_port_proxy_md_status_notify(struct port_proxy *port_prox, unsigned int state) 393 { 394 struct t7xx_port *port; 395 int i; 396 397 for_each_proxy_port(i, port, port_prox) { 398 const struct t7xx_port_conf *port_conf = port->port_conf; 399 400 if (port_conf->ops->md_state_notify) 401 port_conf->ops->md_state_notify(port, state); 402 } 403 } 404 405 static void t7xx_proxy_init_all_ports(struct t7xx_modem *md) 406 { 407 struct port_proxy *port_prox = md->port_prox; 408 struct t7xx_port *port; 409 int i; 410 411 for_each_proxy_port(i, port, port_prox) { 412 const struct t7xx_port_conf *port_conf = port->port_conf; 413 414 t7xx_port_struct_init(port); 415 416 if (port_conf->tx_ch == PORT_CH_CONTROL_TX) 417 md->core_md.ctl_port = port; 418 419 port->t7xx_dev = md->t7xx_dev; 420 port->dev = &md->t7xx_dev->pdev->dev; 421 spin_lock_init(&port->port_update_lock); 422 port->chan_enable = false; 423 424 if (port_conf->ops->init) 425 port_conf->ops->init(port); 426 } 427 428 t7xx_proxy_setup_ch_mapping(port_prox); 429 } 430 431 static int t7xx_proxy_alloc(struct t7xx_modem *md) 432 { 433 unsigned int port_count = ARRAY_SIZE(t7xx_md_port_conf); 434 struct device *dev = &md->t7xx_dev->pdev->dev; 435 struct port_proxy *port_prox; 436 int i; 437 438 port_prox = devm_kzalloc(dev, sizeof(*port_prox) + sizeof(struct t7xx_port) * port_count, 439 GFP_KERNEL); 440 if (!port_prox) 441 return -ENOMEM; 442 443 md->port_prox = port_prox; 444 port_prox->dev = dev; 445 446 for (i = 0; i < port_count; i++) 447 port_prox->ports[i].port_conf = &t7xx_md_port_conf[i]; 448 449 port_prox->port_count = port_count; 450 t7xx_proxy_init_all_ports(md); 451 return 0; 452 } 453 454 /** 455 * t7xx_port_proxy_init() - Initialize ports. 456 * @md: Modem. 457 * 458 * Create all port instances. 459 * 460 * Return: 461 * * 0 - Success. 462 * * -ERROR - Error code from failure sub-initializations. 463 */ 464 int t7xx_port_proxy_init(struct t7xx_modem *md) 465 { 466 int ret; 467 468 ret = t7xx_proxy_alloc(md); 469 if (ret) 470 return ret; 471 472 t7xx_cldma_set_recv_skb(md->md_ctrl[CLDMA_ID_MD], t7xx_port_proxy_recv_skb); 473 return 0; 474 } 475 476 void t7xx_port_proxy_uninit(struct port_proxy *port_prox) 477 { 478 struct t7xx_port *port; 479 int i; 480 481 for_each_proxy_port(i, port, port_prox) { 482 const struct t7xx_port_conf *port_conf = port->port_conf; 483 484 if (port_conf->ops->uninit) 485 port_conf->ops->uninit(port); 486 } 487 } 488 489 int t7xx_port_proxy_chl_enable_disable(struct port_proxy *port_prox, unsigned int ch_id, 490 bool en_flag) 491 { 492 struct t7xx_port *port = t7xx_proxy_get_port_by_ch(port_prox, ch_id); 493 const struct t7xx_port_conf *port_conf; 494 495 if (!port) 496 return -EINVAL; 497 498 port_conf = port->port_conf; 499 500 if (en_flag) { 501 if (port_conf->ops->enable_chl) 502 port_conf->ops->enable_chl(port); 503 } else { 504 if (port_conf->ops->disable_chl) 505 port_conf->ops->disable_chl(port); 506 } 507 508 return 0; 509 } 510