1 /* 2 * Copyright (c) 2016-2017, Linaro Ltd 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 and 6 * only version 2 as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 */ 13 14 #include <linux/idr.h> 15 #include <linux/interrupt.h> 16 #include <linux/io.h> 17 #include <linux/list.h> 18 #include <linux/mfd/syscon.h> 19 #include <linux/module.h> 20 #include <linux/of.h> 21 #include <linux/of_address.h> 22 #include <linux/of_irq.h> 23 #include <linux/platform_device.h> 24 #include <linux/regmap.h> 25 #include <linux/rpmsg.h> 26 #include <linux/sizes.h> 27 #include <linux/slab.h> 28 #include <linux/workqueue.h> 29 #include <linux/mailbox_client.h> 30 31 #include "rpmsg_internal.h" 32 #include "qcom_glink_native.h" 33 34 #define GLINK_NAME_SIZE 32 35 #define GLINK_VERSION_1 1 36 37 #define RPM_GLINK_CID_MIN 1 38 #define RPM_GLINK_CID_MAX 65536 39 40 struct glink_msg { 41 __le16 cmd; 42 __le16 param1; 43 __le32 param2; 44 u8 data[]; 45 } __packed; 46 47 /** 48 * struct glink_defer_cmd - deferred incoming control message 49 * @node: list node 50 * @msg: message header 51 * data: payload of the message 52 * 53 * Copy of a received control message, to be added to @rx_queue and processed 54 * by @rx_work of @qcom_glink. 55 */ 56 struct glink_defer_cmd { 57 struct list_head node; 58 59 struct glink_msg msg; 60 u8 data[]; 61 }; 62 63 /** 64 * struct glink_core_rx_intent - RX intent 65 * RX intent 66 * 67 * data: pointer to the data (may be NULL for zero-copy) 68 * id: remote or local intent ID 69 * size: size of the original intent (do not modify) 70 * reuse: To mark if the intent can be reused after first use 71 * in_use: To mark if intent is already in use for the channel 72 * offset: next write offset (initially 0) 73 */ 74 struct glink_core_rx_intent { 75 void *data; 76 u32 id; 77 size_t size; 78 bool reuse; 79 bool in_use; 80 u32 offset; 81 82 struct list_head node; 83 }; 84 85 /** 86 * struct qcom_glink - driver context, relates to one remote subsystem 87 * @dev: reference to the associated struct device 88 * @mbox_client: mailbox client 89 * @mbox_chan: mailbox channel 90 * @rx_pipe: pipe object for receive FIFO 91 * @tx_pipe: pipe object for transmit FIFO 92 * @irq: IRQ for signaling incoming events 93 * @rx_work: worker for handling received control messages 94 * @rx_lock: protects the @rx_queue 95 * @rx_queue: queue of received control messages to be processed in @rx_work 96 * @tx_lock: synchronizes operations on the tx fifo 97 * @idr_lock: synchronizes @lcids and @rcids modifications 98 * @lcids: idr of all channels with a known local channel id 99 * @rcids: idr of all channels with a known remote channel id 100 */ 101 struct qcom_glink { 102 struct device *dev; 103 104 struct mbox_client mbox_client; 105 struct mbox_chan *mbox_chan; 106 107 struct qcom_glink_pipe *rx_pipe; 108 struct qcom_glink_pipe *tx_pipe; 109 110 int irq; 111 112 struct work_struct rx_work; 113 spinlock_t rx_lock; 114 struct list_head rx_queue; 115 116 spinlock_t tx_lock; 117 118 spinlock_t idr_lock; 119 struct idr lcids; 120 struct idr rcids; 121 unsigned long features; 122 123 bool intentless; 124 }; 125 126 enum { 127 GLINK_STATE_CLOSED, 128 GLINK_STATE_OPENING, 129 GLINK_STATE_OPEN, 130 GLINK_STATE_CLOSING, 131 }; 132 133 /** 134 * struct glink_channel - internal representation of a channel 135 * @rpdev: rpdev reference, only used for primary endpoints 136 * @ept: rpmsg endpoint this channel is associated with 137 * @glink: qcom_glink context handle 138 * @refcount: refcount for the channel object 139 * @recv_lock: guard for @ept.cb 140 * @name: unique channel name/identifier 141 * @lcid: channel id, in local space 142 * @rcid: channel id, in remote space 143 * @intent_lock: lock for protection of @liids, @riids 144 * @liids: idr of all local intents 145 * @riids: idr of all remote intents 146 * @intent_work: worker responsible for transmitting rx_done packets 147 * @done_intents: list of intents that needs to be announced rx_done 148 * @buf: receive buffer, for gathering fragments 149 * @buf_offset: write offset in @buf 150 * @buf_size: size of current @buf 151 * @open_ack: completed once remote has acked the open-request 152 * @open_req: completed once open-request has been received 153 * @intent_req_lock: Synchronises multiple intent requests 154 * @intent_req_result: Result of intent request 155 * @intent_req_comp: Completion for intent_req signalling 156 */ 157 struct glink_channel { 158 struct rpmsg_endpoint ept; 159 160 struct rpmsg_device *rpdev; 161 struct qcom_glink *glink; 162 163 struct kref refcount; 164 165 spinlock_t recv_lock; 166 167 char *name; 168 unsigned int lcid; 169 unsigned int rcid; 170 171 spinlock_t intent_lock; 172 struct idr liids; 173 struct idr riids; 174 struct work_struct intent_work; 175 struct list_head done_intents; 176 177 struct glink_core_rx_intent *buf; 178 int buf_offset; 179 int buf_size; 180 181 struct completion open_ack; 182 struct completion open_req; 183 184 struct mutex intent_req_lock; 185 bool intent_req_result; 186 struct completion intent_req_comp; 187 }; 188 189 #define to_glink_channel(_ept) container_of(_ept, struct glink_channel, ept) 190 191 static const struct rpmsg_endpoint_ops glink_endpoint_ops; 192 193 #define RPM_CMD_VERSION 0 194 #define RPM_CMD_VERSION_ACK 1 195 #define RPM_CMD_OPEN 2 196 #define RPM_CMD_CLOSE 3 197 #define RPM_CMD_OPEN_ACK 4 198 #define RPM_CMD_INTENT 5 199 #define RPM_CMD_RX_DONE 6 200 #define RPM_CMD_RX_INTENT_REQ 7 201 #define RPM_CMD_RX_INTENT_REQ_ACK 8 202 #define RPM_CMD_TX_DATA 9 203 #define RPM_CMD_CLOSE_ACK 11 204 #define RPM_CMD_TX_DATA_CONT 12 205 #define RPM_CMD_READ_NOTIF 13 206 #define RPM_CMD_RX_DONE_W_REUSE 14 207 208 #define GLINK_FEATURE_INTENTLESS BIT(1) 209 210 static void qcom_glink_rx_done_work(struct work_struct *work); 211 212 static struct glink_channel *qcom_glink_alloc_channel(struct qcom_glink *glink, 213 const char *name) 214 { 215 struct glink_channel *channel; 216 217 channel = kzalloc(sizeof(*channel), GFP_KERNEL); 218 if (!channel) 219 return ERR_PTR(-ENOMEM); 220 221 /* Setup glink internal glink_channel data */ 222 spin_lock_init(&channel->recv_lock); 223 spin_lock_init(&channel->intent_lock); 224 mutex_init(&channel->intent_req_lock); 225 226 channel->glink = glink; 227 channel->name = kstrdup(name, GFP_KERNEL); 228 229 init_completion(&channel->open_req); 230 init_completion(&channel->open_ack); 231 init_completion(&channel->intent_req_comp); 232 233 INIT_LIST_HEAD(&channel->done_intents); 234 INIT_WORK(&channel->intent_work, qcom_glink_rx_done_work); 235 236 idr_init(&channel->liids); 237 idr_init(&channel->riids); 238 kref_init(&channel->refcount); 239 240 return channel; 241 } 242 243 static void qcom_glink_channel_release(struct kref *ref) 244 { 245 struct glink_channel *channel = container_of(ref, struct glink_channel, 246 refcount); 247 unsigned long flags; 248 249 spin_lock_irqsave(&channel->intent_lock, flags); 250 idr_destroy(&channel->liids); 251 idr_destroy(&channel->riids); 252 spin_unlock_irqrestore(&channel->intent_lock, flags); 253 254 kfree(channel->name); 255 kfree(channel); 256 } 257 258 static size_t qcom_glink_rx_avail(struct qcom_glink *glink) 259 { 260 return glink->rx_pipe->avail(glink->rx_pipe); 261 } 262 263 static void qcom_glink_rx_peak(struct qcom_glink *glink, 264 void *data, unsigned int offset, size_t count) 265 { 266 glink->rx_pipe->peak(glink->rx_pipe, data, offset, count); 267 } 268 269 static void qcom_glink_rx_advance(struct qcom_glink *glink, size_t count) 270 { 271 glink->rx_pipe->advance(glink->rx_pipe, count); 272 } 273 274 static size_t qcom_glink_tx_avail(struct qcom_glink *glink) 275 { 276 return glink->tx_pipe->avail(glink->tx_pipe); 277 } 278 279 static void qcom_glink_tx_write(struct qcom_glink *glink, 280 const void *hdr, size_t hlen, 281 const void *data, size_t dlen) 282 { 283 glink->tx_pipe->write(glink->tx_pipe, hdr, hlen, data, dlen); 284 } 285 286 static int qcom_glink_tx(struct qcom_glink *glink, 287 const void *hdr, size_t hlen, 288 const void *data, size_t dlen, bool wait) 289 { 290 unsigned int tlen = hlen + dlen; 291 unsigned long flags; 292 int ret = 0; 293 294 /* Reject packets that are too big */ 295 if (tlen >= glink->tx_pipe->length) 296 return -EINVAL; 297 298 spin_lock_irqsave(&glink->tx_lock, flags); 299 300 while (qcom_glink_tx_avail(glink) < tlen) { 301 if (!wait) { 302 ret = -EAGAIN; 303 goto out; 304 } 305 306 /* Wait without holding the tx_lock */ 307 spin_unlock_irqrestore(&glink->tx_lock, flags); 308 309 usleep_range(10000, 15000); 310 311 spin_lock_irqsave(&glink->tx_lock, flags); 312 } 313 314 qcom_glink_tx_write(glink, hdr, hlen, data, dlen); 315 316 mbox_send_message(glink->mbox_chan, NULL); 317 mbox_client_txdone(glink->mbox_chan, 0); 318 319 out: 320 spin_unlock_irqrestore(&glink->tx_lock, flags); 321 322 return ret; 323 } 324 325 static int qcom_glink_send_version(struct qcom_glink *glink) 326 { 327 struct glink_msg msg; 328 329 msg.cmd = cpu_to_le16(RPM_CMD_VERSION); 330 msg.param1 = cpu_to_le16(GLINK_VERSION_1); 331 msg.param2 = cpu_to_le32(glink->features); 332 333 return qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); 334 } 335 336 static void qcom_glink_send_version_ack(struct qcom_glink *glink) 337 { 338 struct glink_msg msg; 339 340 msg.cmd = cpu_to_le16(RPM_CMD_VERSION_ACK); 341 msg.param1 = cpu_to_le16(GLINK_VERSION_1); 342 msg.param2 = cpu_to_le32(glink->features); 343 344 qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); 345 } 346 347 static void qcom_glink_send_open_ack(struct qcom_glink *glink, 348 struct glink_channel *channel) 349 { 350 struct glink_msg msg; 351 352 msg.cmd = cpu_to_le16(RPM_CMD_OPEN_ACK); 353 msg.param1 = cpu_to_le16(channel->rcid); 354 msg.param2 = cpu_to_le32(0); 355 356 qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); 357 } 358 359 static void qcom_glink_handle_intent_req_ack(struct qcom_glink *glink, 360 unsigned int cid, bool granted) 361 { 362 struct glink_channel *channel; 363 unsigned long flags; 364 365 spin_lock_irqsave(&glink->idr_lock, flags); 366 channel = idr_find(&glink->rcids, cid); 367 spin_unlock_irqrestore(&glink->idr_lock, flags); 368 if (!channel) { 369 dev_err(glink->dev, "unable to find channel\n"); 370 return; 371 } 372 373 channel->intent_req_result = granted; 374 complete(&channel->intent_req_comp); 375 } 376 377 /** 378 * qcom_glink_send_open_req() - send a RPM_CMD_OPEN request to the remote 379 * @glink: Ptr to the glink edge 380 * @channel: Ptr to the channel that the open req is sent 381 * 382 * Allocates a local channel id and sends a RPM_CMD_OPEN message to the remote. 383 * Will return with refcount held, regardless of outcome. 384 * 385 * Returns 0 on success, negative errno otherwise. 386 */ 387 static int qcom_glink_send_open_req(struct qcom_glink *glink, 388 struct glink_channel *channel) 389 { 390 struct { 391 struct glink_msg msg; 392 u8 name[GLINK_NAME_SIZE]; 393 } __packed req; 394 int name_len = strlen(channel->name) + 1; 395 int req_len = ALIGN(sizeof(req.msg) + name_len, 8); 396 int ret; 397 unsigned long flags; 398 399 kref_get(&channel->refcount); 400 401 spin_lock_irqsave(&glink->idr_lock, flags); 402 ret = idr_alloc_cyclic(&glink->lcids, channel, 403 RPM_GLINK_CID_MIN, RPM_GLINK_CID_MAX, 404 GFP_ATOMIC); 405 spin_unlock_irqrestore(&glink->idr_lock, flags); 406 if (ret < 0) 407 return ret; 408 409 channel->lcid = ret; 410 411 req.msg.cmd = cpu_to_le16(RPM_CMD_OPEN); 412 req.msg.param1 = cpu_to_le16(channel->lcid); 413 req.msg.param2 = cpu_to_le32(name_len); 414 strcpy(req.name, channel->name); 415 416 ret = qcom_glink_tx(glink, &req, req_len, NULL, 0, true); 417 if (ret) 418 goto remove_idr; 419 420 return 0; 421 422 remove_idr: 423 spin_lock_irqsave(&glink->idr_lock, flags); 424 idr_remove(&glink->lcids, channel->lcid); 425 channel->lcid = 0; 426 spin_unlock_irqrestore(&glink->idr_lock, flags); 427 428 return ret; 429 } 430 431 static void qcom_glink_send_close_req(struct qcom_glink *glink, 432 struct glink_channel *channel) 433 { 434 struct glink_msg req; 435 436 req.cmd = cpu_to_le16(RPM_CMD_CLOSE); 437 req.param1 = cpu_to_le16(channel->lcid); 438 req.param2 = 0; 439 440 qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true); 441 } 442 443 static void qcom_glink_send_close_ack(struct qcom_glink *glink, 444 unsigned int rcid) 445 { 446 struct glink_msg req; 447 448 req.cmd = cpu_to_le16(RPM_CMD_CLOSE_ACK); 449 req.param1 = cpu_to_le16(rcid); 450 req.param2 = 0; 451 452 qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true); 453 } 454 455 static void qcom_glink_rx_done_work(struct work_struct *work) 456 { 457 struct glink_channel *channel = container_of(work, struct glink_channel, 458 intent_work); 459 struct qcom_glink *glink = channel->glink; 460 struct glink_core_rx_intent *intent, *tmp; 461 struct { 462 u16 id; 463 u16 lcid; 464 u32 liid; 465 } __packed cmd; 466 467 unsigned int cid = channel->lcid; 468 unsigned int iid; 469 bool reuse; 470 unsigned long flags; 471 472 spin_lock_irqsave(&channel->intent_lock, flags); 473 list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) { 474 list_del(&intent->node); 475 spin_unlock_irqrestore(&channel->intent_lock, flags); 476 iid = intent->id; 477 reuse = intent->reuse; 478 479 cmd.id = reuse ? RPM_CMD_RX_DONE_W_REUSE : RPM_CMD_RX_DONE; 480 cmd.lcid = cid; 481 cmd.liid = iid; 482 483 qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); 484 if (!reuse) { 485 kfree(intent->data); 486 kfree(intent); 487 } 488 spin_lock_irqsave(&channel->intent_lock, flags); 489 } 490 spin_unlock_irqrestore(&channel->intent_lock, flags); 491 } 492 493 static void qcom_glink_rx_done(struct qcom_glink *glink, 494 struct glink_channel *channel, 495 struct glink_core_rx_intent *intent) 496 { 497 /* We don't send RX_DONE to intentless systems */ 498 if (glink->intentless) { 499 kfree(intent->data); 500 kfree(intent); 501 return; 502 } 503 504 /* Take it off the tree of receive intents */ 505 if (!intent->reuse) { 506 spin_lock(&channel->intent_lock); 507 idr_remove(&channel->liids, intent->id); 508 spin_unlock(&channel->intent_lock); 509 } 510 511 /* Schedule the sending of a rx_done indication */ 512 spin_lock(&channel->intent_lock); 513 list_add_tail(&intent->node, &channel->done_intents); 514 spin_unlock(&channel->intent_lock); 515 516 schedule_work(&channel->intent_work); 517 } 518 519 /** 520 * qcom_glink_receive_version() - receive version/features from remote system 521 * 522 * @glink: pointer to transport interface 523 * @r_version: remote version 524 * @r_features: remote features 525 * 526 * This function is called in response to a remote-initiated version/feature 527 * negotiation sequence. 528 */ 529 static void qcom_glink_receive_version(struct qcom_glink *glink, 530 u32 version, 531 u32 features) 532 { 533 switch (version) { 534 case 0: 535 break; 536 case GLINK_VERSION_1: 537 glink->features &= features; 538 /* FALLTHROUGH */ 539 default: 540 qcom_glink_send_version_ack(glink); 541 break; 542 } 543 } 544 545 /** 546 * qcom_glink_receive_version_ack() - receive negotiation ack from remote system 547 * 548 * @glink: pointer to transport interface 549 * @r_version: remote version response 550 * @r_features: remote features response 551 * 552 * This function is called in response to a local-initiated version/feature 553 * negotiation sequence and is the counter-offer from the remote side based 554 * upon the initial version and feature set requested. 555 */ 556 static void qcom_glink_receive_version_ack(struct qcom_glink *glink, 557 u32 version, 558 u32 features) 559 { 560 switch (version) { 561 case 0: 562 /* Version negotiation failed */ 563 break; 564 case GLINK_VERSION_1: 565 if (features == glink->features) 566 break; 567 568 glink->features &= features; 569 /* FALLTHROUGH */ 570 default: 571 qcom_glink_send_version(glink); 572 break; 573 } 574 } 575 576 /** 577 * qcom_glink_send_intent_req_ack() - convert an rx intent request ack cmd to 578 wire format and transmit 579 * @glink: The transport to transmit on. 580 * @channel: The glink channel 581 * @granted: The request response to encode. 582 * 583 * Return: 0 on success or standard Linux error code. 584 */ 585 static int qcom_glink_send_intent_req_ack(struct qcom_glink *glink, 586 struct glink_channel *channel, 587 bool granted) 588 { 589 struct glink_msg msg; 590 591 msg.cmd = cpu_to_le16(RPM_CMD_RX_INTENT_REQ_ACK); 592 msg.param1 = cpu_to_le16(channel->lcid); 593 msg.param2 = cpu_to_le32(granted); 594 595 qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); 596 597 return 0; 598 } 599 600 /** 601 * qcom_glink_advertise_intent - convert an rx intent cmd to wire format and 602 * transmit 603 * @glink: The transport to transmit on. 604 * @channel: The local channel 605 * @size: The intent to pass on to remote. 606 * 607 * Return: 0 on success or standard Linux error code. 608 */ 609 static int qcom_glink_advertise_intent(struct qcom_glink *glink, 610 struct glink_channel *channel, 611 struct glink_core_rx_intent *intent) 612 { 613 struct command { 614 u16 id; 615 u16 lcid; 616 u32 count; 617 u32 size; 618 u32 liid; 619 } __packed; 620 struct command cmd; 621 622 cmd.id = cpu_to_le16(RPM_CMD_INTENT); 623 cmd.lcid = cpu_to_le16(channel->lcid); 624 cmd.count = cpu_to_le32(1); 625 cmd.size = cpu_to_le32(intent->size); 626 cmd.liid = cpu_to_le32(intent->id); 627 628 qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); 629 630 return 0; 631 } 632 633 static struct glink_core_rx_intent * 634 qcom_glink_alloc_intent(struct qcom_glink *glink, 635 struct glink_channel *channel, 636 size_t size, 637 bool reuseable) 638 { 639 struct glink_core_rx_intent *intent; 640 int ret; 641 unsigned long flags; 642 643 intent = kzalloc(sizeof(*intent), GFP_KERNEL); 644 if (!intent) 645 return NULL; 646 647 intent->data = kzalloc(size, GFP_KERNEL); 648 if (!intent->data) 649 goto free_intent; 650 651 spin_lock_irqsave(&channel->intent_lock, flags); 652 ret = idr_alloc_cyclic(&channel->liids, intent, 1, -1, GFP_ATOMIC); 653 if (ret < 0) { 654 spin_unlock_irqrestore(&channel->intent_lock, flags); 655 goto free_data; 656 } 657 spin_unlock_irqrestore(&channel->intent_lock, flags); 658 659 intent->id = ret; 660 intent->size = size; 661 intent->reuse = reuseable; 662 663 return intent; 664 665 free_data: 666 kfree(intent->data); 667 free_intent: 668 kfree(intent); 669 return NULL; 670 } 671 672 static void qcom_glink_handle_rx_done(struct qcom_glink *glink, 673 u32 cid, uint32_t iid, 674 bool reuse) 675 { 676 struct glink_core_rx_intent *intent; 677 struct glink_channel *channel; 678 unsigned long flags; 679 680 spin_lock_irqsave(&glink->idr_lock, flags); 681 channel = idr_find(&glink->rcids, cid); 682 spin_unlock_irqrestore(&glink->idr_lock, flags); 683 if (!channel) { 684 dev_err(glink->dev, "invalid channel id received\n"); 685 return; 686 } 687 688 spin_lock_irqsave(&channel->intent_lock, flags); 689 intent = idr_find(&channel->riids, iid); 690 691 if (!intent) { 692 spin_unlock_irqrestore(&channel->intent_lock, flags); 693 dev_err(glink->dev, "invalid intent id received\n"); 694 return; 695 } 696 697 intent->in_use = false; 698 699 if (!reuse) { 700 idr_remove(&channel->riids, intent->id); 701 kfree(intent); 702 } 703 spin_unlock_irqrestore(&channel->intent_lock, flags); 704 } 705 706 /** 707 * qcom_glink_handle_intent_req() - Receive a request for rx_intent 708 * from remote side 709 * if_ptr: Pointer to the transport interface 710 * rcid: Remote channel ID 711 * size: size of the intent 712 * 713 * The function searches for the local channel to which the request for 714 * rx_intent has arrived and allocates and notifies the remote back 715 */ 716 static void qcom_glink_handle_intent_req(struct qcom_glink *glink, 717 u32 cid, size_t size) 718 { 719 struct glink_core_rx_intent *intent; 720 struct glink_channel *channel; 721 unsigned long flags; 722 723 spin_lock_irqsave(&glink->idr_lock, flags); 724 channel = idr_find(&glink->rcids, cid); 725 spin_unlock_irqrestore(&glink->idr_lock, flags); 726 727 if (!channel) { 728 pr_err("%s channel not found for cid %d\n", __func__, cid); 729 return; 730 } 731 732 intent = qcom_glink_alloc_intent(glink, channel, size, false); 733 if (intent) 734 qcom_glink_advertise_intent(glink, channel, intent); 735 736 qcom_glink_send_intent_req_ack(glink, channel, !!intent); 737 } 738 739 static int qcom_glink_rx_defer(struct qcom_glink *glink, size_t extra) 740 { 741 struct glink_defer_cmd *dcmd; 742 743 extra = ALIGN(extra, 8); 744 745 if (qcom_glink_rx_avail(glink) < sizeof(struct glink_msg) + extra) { 746 dev_dbg(glink->dev, "Insufficient data in rx fifo"); 747 return -ENXIO; 748 } 749 750 dcmd = kzalloc(sizeof(*dcmd) + extra, GFP_ATOMIC); 751 if (!dcmd) 752 return -ENOMEM; 753 754 INIT_LIST_HEAD(&dcmd->node); 755 756 qcom_glink_rx_peak(glink, &dcmd->msg, 0, sizeof(dcmd->msg) + extra); 757 758 spin_lock(&glink->rx_lock); 759 list_add_tail(&dcmd->node, &glink->rx_queue); 760 spin_unlock(&glink->rx_lock); 761 762 schedule_work(&glink->rx_work); 763 qcom_glink_rx_advance(glink, sizeof(dcmd->msg) + extra); 764 765 return 0; 766 } 767 768 static int qcom_glink_rx_data(struct qcom_glink *glink, size_t avail) 769 { 770 struct glink_core_rx_intent *intent; 771 struct glink_channel *channel; 772 struct { 773 struct glink_msg msg; 774 __le32 chunk_size; 775 __le32 left_size; 776 } __packed hdr; 777 unsigned int chunk_size; 778 unsigned int left_size; 779 unsigned int rcid; 780 unsigned int liid; 781 int ret = 0; 782 unsigned long flags; 783 784 if (avail < sizeof(hdr)) { 785 dev_dbg(glink->dev, "Not enough data in fifo\n"); 786 return -EAGAIN; 787 } 788 789 qcom_glink_rx_peak(glink, &hdr, 0, sizeof(hdr)); 790 chunk_size = le32_to_cpu(hdr.chunk_size); 791 left_size = le32_to_cpu(hdr.left_size); 792 793 if (avail < sizeof(hdr) + chunk_size) { 794 dev_dbg(glink->dev, "Payload not yet in fifo\n"); 795 return -EAGAIN; 796 } 797 798 if (WARN(chunk_size % 4, "Incoming data must be word aligned\n")) 799 return -EINVAL; 800 801 rcid = le16_to_cpu(hdr.msg.param1); 802 spin_lock_irqsave(&glink->idr_lock, flags); 803 channel = idr_find(&glink->rcids, rcid); 804 spin_unlock_irqrestore(&glink->idr_lock, flags); 805 if (!channel) { 806 dev_dbg(glink->dev, "Data on non-existing channel\n"); 807 808 /* Drop the message */ 809 goto advance_rx; 810 } 811 812 if (glink->intentless) { 813 /* Might have an ongoing, fragmented, message to append */ 814 if (!channel->buf) { 815 intent = kzalloc(sizeof(*intent), GFP_ATOMIC); 816 if (!intent) 817 return -ENOMEM; 818 819 intent->data = kmalloc(chunk_size + left_size, 820 GFP_ATOMIC); 821 if (!intent->data) { 822 kfree(intent); 823 return -ENOMEM; 824 } 825 826 intent->id = 0xbabababa; 827 intent->size = chunk_size + left_size; 828 intent->offset = 0; 829 830 channel->buf = intent; 831 } else { 832 intent = channel->buf; 833 } 834 } else { 835 liid = le32_to_cpu(hdr.msg.param2); 836 837 spin_lock_irqsave(&channel->intent_lock, flags); 838 intent = idr_find(&channel->liids, liid); 839 spin_unlock_irqrestore(&channel->intent_lock, flags); 840 841 if (!intent) { 842 dev_err(glink->dev, 843 "no intent found for channel %s intent %d", 844 channel->name, liid); 845 goto advance_rx; 846 } 847 } 848 849 if (intent->size - intent->offset < chunk_size) { 850 dev_err(glink->dev, "Insufficient space in intent\n"); 851 852 /* The packet header lied, drop payload */ 853 goto advance_rx; 854 } 855 856 qcom_glink_rx_peak(glink, intent->data + intent->offset, 857 sizeof(hdr), chunk_size); 858 intent->offset += chunk_size; 859 860 /* Handle message when no fragments remain to be received */ 861 if (!left_size) { 862 spin_lock(&channel->recv_lock); 863 if (channel->ept.cb) { 864 channel->ept.cb(channel->ept.rpdev, 865 intent->data, 866 intent->offset, 867 channel->ept.priv, 868 RPMSG_ADDR_ANY); 869 } 870 spin_unlock(&channel->recv_lock); 871 872 intent->offset = 0; 873 channel->buf = NULL; 874 875 qcom_glink_rx_done(glink, channel, intent); 876 } 877 878 advance_rx: 879 qcom_glink_rx_advance(glink, ALIGN(sizeof(hdr) + chunk_size, 8)); 880 881 return ret; 882 } 883 884 static void qcom_glink_handle_intent(struct qcom_glink *glink, 885 unsigned int cid, 886 unsigned int count, 887 size_t avail) 888 { 889 struct glink_core_rx_intent *intent; 890 struct glink_channel *channel; 891 struct intent_pair { 892 __le32 size; 893 __le32 iid; 894 }; 895 896 struct { 897 struct glink_msg msg; 898 struct intent_pair intents[]; 899 } __packed * msg; 900 901 const size_t msglen = sizeof(*msg) + sizeof(struct intent_pair) * count; 902 int ret; 903 int i; 904 unsigned long flags; 905 906 if (avail < msglen) { 907 dev_dbg(glink->dev, "Not enough data in fifo\n"); 908 return; 909 } 910 911 spin_lock_irqsave(&glink->idr_lock, flags); 912 channel = idr_find(&glink->rcids, cid); 913 spin_unlock_irqrestore(&glink->idr_lock, flags); 914 if (!channel) { 915 dev_err(glink->dev, "intents for non-existing channel\n"); 916 return; 917 } 918 919 msg = kmalloc(msglen, GFP_ATOMIC); 920 if (!msg) 921 return; 922 923 qcom_glink_rx_peak(glink, msg, 0, msglen); 924 925 for (i = 0; i < count; ++i) { 926 intent = kzalloc(sizeof(*intent), GFP_ATOMIC); 927 if (!intent) 928 break; 929 930 intent->id = le32_to_cpu(msg->intents[i].iid); 931 intent->size = le32_to_cpu(msg->intents[i].size); 932 933 spin_lock_irqsave(&channel->intent_lock, flags); 934 ret = idr_alloc(&channel->riids, intent, 935 intent->id, intent->id + 1, GFP_ATOMIC); 936 spin_unlock_irqrestore(&channel->intent_lock, flags); 937 938 if (ret < 0) 939 dev_err(glink->dev, "failed to store remote intent\n"); 940 } 941 942 kfree(msg); 943 qcom_glink_rx_advance(glink, ALIGN(msglen, 8)); 944 } 945 946 static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid) 947 { 948 struct glink_channel *channel; 949 950 spin_lock(&glink->idr_lock); 951 channel = idr_find(&glink->lcids, lcid); 952 spin_unlock(&glink->idr_lock); 953 if (!channel) { 954 dev_err(glink->dev, "Invalid open ack packet\n"); 955 return -EINVAL; 956 } 957 958 complete(&channel->open_ack); 959 960 return 0; 961 } 962 963 static irqreturn_t qcom_glink_native_intr(int irq, void *data) 964 { 965 struct qcom_glink *glink = data; 966 struct glink_msg msg; 967 unsigned int param1; 968 unsigned int param2; 969 unsigned int avail; 970 unsigned int cmd; 971 int ret = 0; 972 973 for (;;) { 974 avail = qcom_glink_rx_avail(glink); 975 if (avail < sizeof(msg)) 976 break; 977 978 qcom_glink_rx_peak(glink, &msg, 0, sizeof(msg)); 979 980 cmd = le16_to_cpu(msg.cmd); 981 param1 = le16_to_cpu(msg.param1); 982 param2 = le32_to_cpu(msg.param2); 983 984 switch (cmd) { 985 case RPM_CMD_VERSION: 986 case RPM_CMD_VERSION_ACK: 987 case RPM_CMD_CLOSE: 988 case RPM_CMD_CLOSE_ACK: 989 case RPM_CMD_RX_INTENT_REQ: 990 ret = qcom_glink_rx_defer(glink, 0); 991 break; 992 case RPM_CMD_OPEN_ACK: 993 ret = qcom_glink_rx_open_ack(glink, param1); 994 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); 995 break; 996 case RPM_CMD_OPEN: 997 ret = qcom_glink_rx_defer(glink, param2); 998 break; 999 case RPM_CMD_TX_DATA: 1000 case RPM_CMD_TX_DATA_CONT: 1001 ret = qcom_glink_rx_data(glink, avail); 1002 break; 1003 case RPM_CMD_READ_NOTIF: 1004 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); 1005 1006 mbox_send_message(glink->mbox_chan, NULL); 1007 mbox_client_txdone(glink->mbox_chan, 0); 1008 break; 1009 case RPM_CMD_INTENT: 1010 qcom_glink_handle_intent(glink, param1, param2, avail); 1011 break; 1012 case RPM_CMD_RX_DONE: 1013 qcom_glink_handle_rx_done(glink, param1, param2, false); 1014 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); 1015 break; 1016 case RPM_CMD_RX_DONE_W_REUSE: 1017 qcom_glink_handle_rx_done(glink, param1, param2, true); 1018 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); 1019 break; 1020 case RPM_CMD_RX_INTENT_REQ_ACK: 1021 qcom_glink_handle_intent_req_ack(glink, param1, param2); 1022 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); 1023 break; 1024 default: 1025 dev_err(glink->dev, "unhandled rx cmd: %d\n", cmd); 1026 ret = -EINVAL; 1027 break; 1028 } 1029 1030 if (ret) 1031 break; 1032 } 1033 1034 return IRQ_HANDLED; 1035 } 1036 1037 /* Locally initiated rpmsg_create_ept */ 1038 static struct glink_channel *qcom_glink_create_local(struct qcom_glink *glink, 1039 const char *name) 1040 { 1041 struct glink_channel *channel; 1042 int ret; 1043 unsigned long flags; 1044 1045 channel = qcom_glink_alloc_channel(glink, name); 1046 if (IS_ERR(channel)) 1047 return ERR_CAST(channel); 1048 1049 ret = qcom_glink_send_open_req(glink, channel); 1050 if (ret) 1051 goto release_channel; 1052 1053 ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ); 1054 if (!ret) 1055 goto err_timeout; 1056 1057 ret = wait_for_completion_timeout(&channel->open_req, 5 * HZ); 1058 if (!ret) 1059 goto err_timeout; 1060 1061 qcom_glink_send_open_ack(glink, channel); 1062 1063 return channel; 1064 1065 err_timeout: 1066 /* qcom_glink_send_open_req() did register the channel in lcids*/ 1067 spin_lock_irqsave(&glink->idr_lock, flags); 1068 idr_remove(&glink->lcids, channel->lcid); 1069 spin_unlock_irqrestore(&glink->idr_lock, flags); 1070 1071 release_channel: 1072 /* Release qcom_glink_send_open_req() reference */ 1073 kref_put(&channel->refcount, qcom_glink_channel_release); 1074 /* Release qcom_glink_alloc_channel() reference */ 1075 kref_put(&channel->refcount, qcom_glink_channel_release); 1076 1077 return ERR_PTR(-ETIMEDOUT); 1078 } 1079 1080 /* Remote initiated rpmsg_create_ept */ 1081 static int qcom_glink_create_remote(struct qcom_glink *glink, 1082 struct glink_channel *channel) 1083 { 1084 int ret; 1085 1086 qcom_glink_send_open_ack(glink, channel); 1087 1088 ret = qcom_glink_send_open_req(glink, channel); 1089 if (ret) 1090 goto close_link; 1091 1092 ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ); 1093 if (!ret) { 1094 ret = -ETIMEDOUT; 1095 goto close_link; 1096 } 1097 1098 return 0; 1099 1100 close_link: 1101 /* 1102 * Send a close request to "undo" our open-ack. The close-ack will 1103 * release the last reference. 1104 */ 1105 qcom_glink_send_close_req(glink, channel); 1106 1107 /* Release qcom_glink_send_open_req() reference */ 1108 kref_put(&channel->refcount, qcom_glink_channel_release); 1109 1110 return ret; 1111 } 1112 1113 static struct rpmsg_endpoint *qcom_glink_create_ept(struct rpmsg_device *rpdev, 1114 rpmsg_rx_cb_t cb, 1115 void *priv, 1116 struct rpmsg_channel_info 1117 chinfo) 1118 { 1119 struct glink_channel *parent = to_glink_channel(rpdev->ept); 1120 struct glink_channel *channel; 1121 struct qcom_glink *glink = parent->glink; 1122 struct rpmsg_endpoint *ept; 1123 const char *name = chinfo.name; 1124 int cid; 1125 int ret; 1126 unsigned long flags; 1127 1128 spin_lock_irqsave(&glink->idr_lock, flags); 1129 idr_for_each_entry(&glink->rcids, channel, cid) { 1130 if (!strcmp(channel->name, name)) 1131 break; 1132 } 1133 spin_unlock_irqrestore(&glink->idr_lock, flags); 1134 1135 if (!channel) { 1136 channel = qcom_glink_create_local(glink, name); 1137 if (IS_ERR(channel)) 1138 return NULL; 1139 } else { 1140 ret = qcom_glink_create_remote(glink, channel); 1141 if (ret) 1142 return NULL; 1143 } 1144 1145 ept = &channel->ept; 1146 ept->rpdev = rpdev; 1147 ept->cb = cb; 1148 ept->priv = priv; 1149 ept->ops = &glink_endpoint_ops; 1150 1151 return ept; 1152 } 1153 1154 static int qcom_glink_announce_create(struct rpmsg_device *rpdev) 1155 { 1156 struct glink_channel *channel = to_glink_channel(rpdev->ept); 1157 struct device_node *np = rpdev->dev.of_node; 1158 struct qcom_glink *glink = channel->glink; 1159 struct glink_core_rx_intent *intent; 1160 const struct property *prop = NULL; 1161 __be32 defaults[] = { cpu_to_be32(SZ_1K), cpu_to_be32(5) }; 1162 int num_intents; 1163 int num_groups = 1; 1164 __be32 *val = defaults; 1165 int size; 1166 1167 if (glink->intentless) 1168 return 0; 1169 1170 prop = of_find_property(np, "qcom,intents", NULL); 1171 if (prop) { 1172 val = prop->value; 1173 num_groups = prop->length / sizeof(u32) / 2; 1174 } 1175 1176 /* Channel is now open, advertise base set of intents */ 1177 while (num_groups--) { 1178 size = be32_to_cpup(val++); 1179 num_intents = be32_to_cpup(val++); 1180 while (num_intents--) { 1181 intent = qcom_glink_alloc_intent(glink, channel, size, 1182 true); 1183 if (!intent) 1184 break; 1185 1186 qcom_glink_advertise_intent(glink, channel, intent); 1187 } 1188 } 1189 return 0; 1190 } 1191 1192 static void qcom_glink_destroy_ept(struct rpmsg_endpoint *ept) 1193 { 1194 struct glink_channel *channel = to_glink_channel(ept); 1195 struct qcom_glink *glink = channel->glink; 1196 unsigned long flags; 1197 1198 spin_lock_irqsave(&channel->recv_lock, flags); 1199 channel->ept.cb = NULL; 1200 spin_unlock_irqrestore(&channel->recv_lock, flags); 1201 1202 /* Decouple the potential rpdev from the channel */ 1203 channel->rpdev = NULL; 1204 1205 qcom_glink_send_close_req(glink, channel); 1206 } 1207 1208 static int qcom_glink_request_intent(struct qcom_glink *glink, 1209 struct glink_channel *channel, 1210 size_t size) 1211 { 1212 struct { 1213 u16 id; 1214 u16 cid; 1215 u32 size; 1216 } __packed cmd; 1217 1218 int ret; 1219 1220 mutex_lock(&channel->intent_req_lock); 1221 1222 reinit_completion(&channel->intent_req_comp); 1223 1224 cmd.id = RPM_CMD_RX_INTENT_REQ; 1225 cmd.cid = channel->lcid; 1226 cmd.size = size; 1227 1228 ret = qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); 1229 if (ret) 1230 goto unlock; 1231 1232 ret = wait_for_completion_timeout(&channel->intent_req_comp, 10 * HZ); 1233 if (!ret) { 1234 dev_err(glink->dev, "intent request timed out\n"); 1235 ret = -ETIMEDOUT; 1236 } else { 1237 ret = channel->intent_req_result ? 0 : -ECANCELED; 1238 } 1239 1240 unlock: 1241 mutex_unlock(&channel->intent_req_lock); 1242 return ret; 1243 } 1244 1245 static int __qcom_glink_send(struct glink_channel *channel, 1246 void *data, int len, bool wait) 1247 { 1248 struct qcom_glink *glink = channel->glink; 1249 struct glink_core_rx_intent *intent = NULL; 1250 struct glink_core_rx_intent *tmp; 1251 int iid = 0; 1252 struct { 1253 struct glink_msg msg; 1254 __le32 chunk_size; 1255 __le32 left_size; 1256 } __packed req; 1257 int ret; 1258 unsigned long flags; 1259 1260 if (!glink->intentless) { 1261 while (!intent) { 1262 spin_lock_irqsave(&channel->intent_lock, flags); 1263 idr_for_each_entry(&channel->riids, tmp, iid) { 1264 if (tmp->size >= len && !tmp->in_use) { 1265 if (!intent) 1266 intent = tmp; 1267 else if (intent->size > tmp->size) 1268 intent = tmp; 1269 if (intent->size == len) 1270 break; 1271 } 1272 } 1273 if (intent) 1274 intent->in_use = true; 1275 spin_unlock_irqrestore(&channel->intent_lock, flags); 1276 1277 /* We found an available intent */ 1278 if (intent) 1279 break; 1280 1281 if (!wait) 1282 return -EBUSY; 1283 1284 ret = qcom_glink_request_intent(glink, channel, len); 1285 if (ret < 0) 1286 return ret; 1287 } 1288 1289 iid = intent->id; 1290 } 1291 1292 req.msg.cmd = cpu_to_le16(RPM_CMD_TX_DATA); 1293 req.msg.param1 = cpu_to_le16(channel->lcid); 1294 req.msg.param2 = cpu_to_le32(iid); 1295 req.chunk_size = cpu_to_le32(len); 1296 req.left_size = cpu_to_le32(0); 1297 1298 ret = qcom_glink_tx(glink, &req, sizeof(req), data, len, wait); 1299 1300 /* Mark intent available if we failed */ 1301 if (ret && intent) 1302 intent->in_use = false; 1303 1304 return ret; 1305 } 1306 1307 static int qcom_glink_send(struct rpmsg_endpoint *ept, void *data, int len) 1308 { 1309 struct glink_channel *channel = to_glink_channel(ept); 1310 1311 return __qcom_glink_send(channel, data, len, true); 1312 } 1313 1314 static int qcom_glink_trysend(struct rpmsg_endpoint *ept, void *data, int len) 1315 { 1316 struct glink_channel *channel = to_glink_channel(ept); 1317 1318 return __qcom_glink_send(channel, data, len, false); 1319 } 1320 1321 /* 1322 * Finds the device_node for the glink child interested in this channel. 1323 */ 1324 static struct device_node *qcom_glink_match_channel(struct device_node *node, 1325 const char *channel) 1326 { 1327 struct device_node *child; 1328 const char *name; 1329 const char *key; 1330 int ret; 1331 1332 for_each_available_child_of_node(node, child) { 1333 key = "qcom,glink-channels"; 1334 ret = of_property_read_string(child, key, &name); 1335 if (ret) 1336 continue; 1337 1338 if (strcmp(name, channel) == 0) 1339 return child; 1340 } 1341 1342 return NULL; 1343 } 1344 1345 static const struct rpmsg_device_ops glink_device_ops = { 1346 .create_ept = qcom_glink_create_ept, 1347 .announce_create = qcom_glink_announce_create, 1348 }; 1349 1350 static const struct rpmsg_endpoint_ops glink_endpoint_ops = { 1351 .destroy_ept = qcom_glink_destroy_ept, 1352 .send = qcom_glink_send, 1353 .trysend = qcom_glink_trysend, 1354 }; 1355 1356 static void qcom_glink_rpdev_release(struct device *dev) 1357 { 1358 struct rpmsg_device *rpdev = to_rpmsg_device(dev); 1359 struct glink_channel *channel = to_glink_channel(rpdev->ept); 1360 1361 channel->rpdev = NULL; 1362 kfree(rpdev); 1363 } 1364 1365 static int qcom_glink_rx_open(struct qcom_glink *glink, unsigned int rcid, 1366 char *name) 1367 { 1368 struct glink_channel *channel; 1369 struct rpmsg_device *rpdev; 1370 bool create_device = false; 1371 struct device_node *node; 1372 int lcid; 1373 int ret; 1374 unsigned long flags; 1375 1376 spin_lock_irqsave(&glink->idr_lock, flags); 1377 idr_for_each_entry(&glink->lcids, channel, lcid) { 1378 if (!strcmp(channel->name, name)) 1379 break; 1380 } 1381 spin_unlock_irqrestore(&glink->idr_lock, flags); 1382 1383 if (!channel) { 1384 channel = qcom_glink_alloc_channel(glink, name); 1385 if (IS_ERR(channel)) 1386 return PTR_ERR(channel); 1387 1388 /* The opening dance was initiated by the remote */ 1389 create_device = true; 1390 } 1391 1392 spin_lock_irqsave(&glink->idr_lock, flags); 1393 ret = idr_alloc(&glink->rcids, channel, rcid, rcid + 1, GFP_ATOMIC); 1394 if (ret < 0) { 1395 dev_err(glink->dev, "Unable to insert channel into rcid list\n"); 1396 spin_unlock_irqrestore(&glink->idr_lock, flags); 1397 goto free_channel; 1398 } 1399 channel->rcid = ret; 1400 spin_unlock_irqrestore(&glink->idr_lock, flags); 1401 1402 complete(&channel->open_req); 1403 1404 if (create_device) { 1405 rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL); 1406 if (!rpdev) { 1407 ret = -ENOMEM; 1408 goto rcid_remove; 1409 } 1410 1411 rpdev->ept = &channel->ept; 1412 strncpy(rpdev->id.name, name, RPMSG_NAME_SIZE); 1413 rpdev->src = RPMSG_ADDR_ANY; 1414 rpdev->dst = RPMSG_ADDR_ANY; 1415 rpdev->ops = &glink_device_ops; 1416 1417 node = qcom_glink_match_channel(glink->dev->of_node, name); 1418 rpdev->dev.of_node = node; 1419 rpdev->dev.parent = glink->dev; 1420 rpdev->dev.release = qcom_glink_rpdev_release; 1421 1422 ret = rpmsg_register_device(rpdev); 1423 if (ret) 1424 goto free_rpdev; 1425 1426 channel->rpdev = rpdev; 1427 } 1428 1429 return 0; 1430 1431 free_rpdev: 1432 kfree(rpdev); 1433 rcid_remove: 1434 spin_lock_irqsave(&glink->idr_lock, flags); 1435 idr_remove(&glink->rcids, channel->rcid); 1436 channel->rcid = 0; 1437 spin_unlock_irqrestore(&glink->idr_lock, flags); 1438 free_channel: 1439 /* Release the reference, iff we took it */ 1440 if (create_device) 1441 kref_put(&channel->refcount, qcom_glink_channel_release); 1442 1443 return ret; 1444 } 1445 1446 static void qcom_glink_rx_close(struct qcom_glink *glink, unsigned int rcid) 1447 { 1448 struct rpmsg_channel_info chinfo; 1449 struct glink_channel *channel; 1450 unsigned long flags; 1451 1452 spin_lock_irqsave(&glink->idr_lock, flags); 1453 channel = idr_find(&glink->rcids, rcid); 1454 spin_unlock_irqrestore(&glink->idr_lock, flags); 1455 if (WARN(!channel, "close request on unknown channel\n")) 1456 return; 1457 1458 /* cancel pending rx_done work */ 1459 cancel_work_sync(&channel->intent_work); 1460 1461 if (channel->rpdev) { 1462 strncpy(chinfo.name, channel->name, sizeof(chinfo.name)); 1463 chinfo.src = RPMSG_ADDR_ANY; 1464 chinfo.dst = RPMSG_ADDR_ANY; 1465 1466 rpmsg_unregister_device(glink->dev, &chinfo); 1467 } 1468 1469 qcom_glink_send_close_ack(glink, channel->rcid); 1470 1471 spin_lock_irqsave(&glink->idr_lock, flags); 1472 idr_remove(&glink->rcids, channel->rcid); 1473 channel->rcid = 0; 1474 spin_unlock_irqrestore(&glink->idr_lock, flags); 1475 1476 kref_put(&channel->refcount, qcom_glink_channel_release); 1477 } 1478 1479 static void qcom_glink_rx_close_ack(struct qcom_glink *glink, unsigned int lcid) 1480 { 1481 struct glink_channel *channel; 1482 unsigned long flags; 1483 1484 spin_lock_irqsave(&glink->idr_lock, flags); 1485 channel = idr_find(&glink->lcids, lcid); 1486 if (WARN(!channel, "close ack on unknown channel\n")) { 1487 spin_unlock_irqrestore(&glink->idr_lock, flags); 1488 return; 1489 } 1490 1491 idr_remove(&glink->lcids, channel->lcid); 1492 channel->lcid = 0; 1493 spin_unlock_irqrestore(&glink->idr_lock, flags); 1494 1495 kref_put(&channel->refcount, qcom_glink_channel_release); 1496 } 1497 1498 static void qcom_glink_work(struct work_struct *work) 1499 { 1500 struct qcom_glink *glink = container_of(work, struct qcom_glink, 1501 rx_work); 1502 struct glink_defer_cmd *dcmd; 1503 struct glink_msg *msg; 1504 unsigned long flags; 1505 unsigned int param1; 1506 unsigned int param2; 1507 unsigned int cmd; 1508 1509 for (;;) { 1510 spin_lock_irqsave(&glink->rx_lock, flags); 1511 if (list_empty(&glink->rx_queue)) { 1512 spin_unlock_irqrestore(&glink->rx_lock, flags); 1513 break; 1514 } 1515 dcmd = list_first_entry(&glink->rx_queue, 1516 struct glink_defer_cmd, node); 1517 list_del(&dcmd->node); 1518 spin_unlock_irqrestore(&glink->rx_lock, flags); 1519 1520 msg = &dcmd->msg; 1521 cmd = le16_to_cpu(msg->cmd); 1522 param1 = le16_to_cpu(msg->param1); 1523 param2 = le32_to_cpu(msg->param2); 1524 1525 switch (cmd) { 1526 case RPM_CMD_VERSION: 1527 qcom_glink_receive_version(glink, param1, param2); 1528 break; 1529 case RPM_CMD_VERSION_ACK: 1530 qcom_glink_receive_version_ack(glink, param1, param2); 1531 break; 1532 case RPM_CMD_OPEN: 1533 qcom_glink_rx_open(glink, param1, msg->data); 1534 break; 1535 case RPM_CMD_CLOSE: 1536 qcom_glink_rx_close(glink, param1); 1537 break; 1538 case RPM_CMD_CLOSE_ACK: 1539 qcom_glink_rx_close_ack(glink, param1); 1540 break; 1541 case RPM_CMD_RX_INTENT_REQ: 1542 qcom_glink_handle_intent_req(glink, param1, param2); 1543 break; 1544 default: 1545 WARN(1, "Unknown defer object %d\n", cmd); 1546 break; 1547 } 1548 1549 kfree(dcmd); 1550 } 1551 } 1552 1553 struct qcom_glink *qcom_glink_native_probe(struct device *dev, 1554 unsigned long features, 1555 struct qcom_glink_pipe *rx, 1556 struct qcom_glink_pipe *tx, 1557 bool intentless) 1558 { 1559 int irq; 1560 int ret; 1561 struct qcom_glink *glink; 1562 1563 glink = devm_kzalloc(dev, sizeof(*glink), GFP_KERNEL); 1564 if (!glink) 1565 return ERR_PTR(-ENOMEM); 1566 1567 glink->dev = dev; 1568 glink->tx_pipe = tx; 1569 glink->rx_pipe = rx; 1570 1571 glink->features = features; 1572 glink->intentless = intentless; 1573 1574 spin_lock_init(&glink->tx_lock); 1575 spin_lock_init(&glink->rx_lock); 1576 INIT_LIST_HEAD(&glink->rx_queue); 1577 INIT_WORK(&glink->rx_work, qcom_glink_work); 1578 1579 spin_lock_init(&glink->idr_lock); 1580 idr_init(&glink->lcids); 1581 idr_init(&glink->rcids); 1582 1583 glink->mbox_client.dev = dev; 1584 glink->mbox_client.knows_txdone = true; 1585 glink->mbox_chan = mbox_request_channel(&glink->mbox_client, 0); 1586 if (IS_ERR(glink->mbox_chan)) { 1587 if (PTR_ERR(glink->mbox_chan) != -EPROBE_DEFER) 1588 dev_err(dev, "failed to acquire IPC channel\n"); 1589 return ERR_CAST(glink->mbox_chan); 1590 } 1591 1592 irq = of_irq_get(dev->of_node, 0); 1593 ret = devm_request_irq(dev, irq, 1594 qcom_glink_native_intr, 1595 IRQF_NO_SUSPEND | IRQF_SHARED, 1596 "glink-native", glink); 1597 if (ret) { 1598 dev_err(dev, "failed to request IRQ\n"); 1599 return ERR_PTR(ret); 1600 } 1601 1602 glink->irq = irq; 1603 1604 ret = qcom_glink_send_version(glink); 1605 if (ret) 1606 return ERR_PTR(ret); 1607 1608 return glink; 1609 } 1610 EXPORT_SYMBOL_GPL(qcom_glink_native_probe); 1611 1612 static int qcom_glink_remove_device(struct device *dev, void *data) 1613 { 1614 device_unregister(dev); 1615 1616 return 0; 1617 } 1618 1619 void qcom_glink_native_remove(struct qcom_glink *glink) 1620 { 1621 struct glink_channel *channel; 1622 int cid; 1623 int ret; 1624 unsigned long flags; 1625 1626 disable_irq(glink->irq); 1627 cancel_work_sync(&glink->rx_work); 1628 1629 ret = device_for_each_child(glink->dev, NULL, qcom_glink_remove_device); 1630 if (ret) 1631 dev_warn(glink->dev, "Can't remove GLINK devices: %d\n", ret); 1632 1633 spin_lock_irqsave(&glink->idr_lock, flags); 1634 /* Release any defunct local channels, waiting for close-ack */ 1635 idr_for_each_entry(&glink->lcids, channel, cid) 1636 kref_put(&channel->refcount, qcom_glink_channel_release); 1637 1638 idr_destroy(&glink->lcids); 1639 idr_destroy(&glink->rcids); 1640 spin_unlock_irqrestore(&glink->idr_lock, flags); 1641 mbox_free_channel(glink->mbox_chan); 1642 } 1643 EXPORT_SYMBOL_GPL(qcom_glink_native_remove); 1644 1645 void qcom_glink_native_unregister(struct qcom_glink *glink) 1646 { 1647 device_unregister(glink->dev); 1648 } 1649 EXPORT_SYMBOL_GPL(qcom_glink_native_unregister); 1650 1651 MODULE_DESCRIPTION("Qualcomm GLINK driver"); 1652 MODULE_LICENSE("GPL v2"); 1653