1// SPDX-License-Identifier: GPL-2.0 2/* 3 * Copyright (c) 2016-2017, Linaro Ltd 4 */ 5 6#include <linux/idr.h> 7#include <linux/interrupt.h> 8#include <linux/io.h> 9#include <linux/list.h> 10#include <linux/mfd/syscon.h> 11#include <linux/module.h> 12#include <linux/of.h> 13#include <linux/of_address.h> 14#include <linux/of_irq.h> 15#include <linux/platform_device.h> 16#include <linux/regmap.h> 17#include <linux/rpmsg.h> 18#include <linux/sizes.h> 19#include <linux/slab.h> 20#include <linux/workqueue.h> 21#include <linux/mailbox_client.h> 22 23#include "rpmsg_internal.h" 24#include "qcom_glink_native.h" 25 26#define GLINK_NAME_SIZE 32 27#define GLINK_VERSION_1 1 28 29#define RPM_GLINK_CID_MIN 1 30#define RPM_GLINK_CID_MAX 65536 31 32struct glink_msg { 33 __le16 cmd; 34 __le16 param1; 35 __le32 param2; 36 u8 data[]; 37} __packed; 38 39/** 40 * struct glink_defer_cmd - deferred incoming control message 41 * @node: list node 42 * @msg: message header 43 * @data: payload of the message 44 * 45 * Copy of a received control message, to be added to @rx_queue and processed 46 * by @rx_work of @qcom_glink. 47 */ 48struct glink_defer_cmd { 49 struct list_head node; 50 51 struct glink_msg msg; 52 u8 data[]; 53}; 54 55/** 56 * struct glink_core_rx_intent - RX intent 57 * RX intent 58 * 59 * @data: pointer to the data (may be NULL for zero-copy) 60 * @id: remote or local intent ID 61 * @size: size of the original intent (do not modify) 62 * @reuse: To mark if the intent can be reused after first use 63 * @in_use: To mark if intent is already in use for the channel 64 * @offset: next write offset (initially 0) 65 * @node: list node 66 */ 67struct glink_core_rx_intent { 68 void *data; 69 u32 id; 70 size_t size; 71 bool reuse; 72 bool in_use; 73 u32 offset; 74 75 struct list_head node; 76}; 77 78/** 79 * struct qcom_glink - driver context, relates to one remote subsystem 80 * @dev: reference to the associated struct device 81 * @mbox_client: mailbox client 82 * @mbox_chan: mailbox channel 83 * @rx_pipe: pipe object for receive FIFO 84 * @tx_pipe: pipe object for transmit FIFO 85 * @irq: IRQ for signaling incoming events 86 * @rx_work: worker for handling received control messages 87 * @rx_lock: protects the @rx_queue 88 * @rx_queue: queue of received control messages to be processed in @rx_work 89 * @tx_lock: synchronizes operations on the tx fifo 90 * @idr_lock: synchronizes @lcids and @rcids modifications 91 * @lcids: idr of all channels with a known local channel id 92 * @rcids: idr of all channels with a known remote channel id 93 * @features: remote features 94 * @intentless: flag to indicate that there is no intent 95 */ 96struct qcom_glink { 97 struct device *dev; 98 99 const char *name; 100 101 struct mbox_client mbox_client; 102 struct mbox_chan *mbox_chan; 103 104 struct qcom_glink_pipe *rx_pipe; 105 struct qcom_glink_pipe *tx_pipe; 106 107 int irq; 108 109 struct work_struct rx_work; 110 spinlock_t rx_lock; 111 struct list_head rx_queue; 112 113 spinlock_t tx_lock; 114 115 spinlock_t idr_lock; 116 struct idr lcids; 117 struct idr rcids; 118 unsigned long features; 119 120 bool intentless; 121}; 122 123enum { 124 GLINK_STATE_CLOSED, 125 GLINK_STATE_OPENING, 126 GLINK_STATE_OPEN, 127 GLINK_STATE_CLOSING, 128}; 129 130/** 131 * struct glink_channel - internal representation of a channel 132 * @rpdev: rpdev reference, only used for primary endpoints 133 * @ept: rpmsg endpoint this channel is associated with 134 * @glink: qcom_glink context handle 135 * @refcount: refcount for the channel object 136 * @recv_lock: guard for @ept.cb 137 * @name: unique channel name/identifier 138 * @lcid: channel id, in local space 139 * @rcid: channel id, in remote space 140 * @intent_lock: lock for protection of @liids, @riids 141 * @liids: idr of all local intents 142 * @riids: idr of all remote intents 143 * @intent_work: worker responsible for transmitting rx_done packets 144 * @done_intents: list of intents that needs to be announced rx_done 145 * @buf: receive buffer, for gathering fragments 146 * @buf_offset: write offset in @buf 147 * @buf_size: size of current @buf 148 * @open_ack: completed once remote has acked the open-request 149 * @open_req: completed once open-request has been received 150 * @intent_req_lock: Synchronises multiple intent requests 151 * @intent_req_result: Result of intent request 152 * @intent_req_comp: Completion for intent_req signalling 153 */ 154struct glink_channel { 155 struct rpmsg_endpoint ept; 156 157 struct rpmsg_device *rpdev; 158 struct qcom_glink *glink; 159 160 struct kref refcount; 161 162 spinlock_t recv_lock; 163 164 char *name; 165 unsigned int lcid; 166 unsigned int rcid; 167 168 spinlock_t intent_lock; 169 struct idr liids; 170 struct idr riids; 171 struct work_struct intent_work; 172 struct list_head done_intents; 173 174 struct glink_core_rx_intent *buf; 175 int buf_offset; 176 int buf_size; 177 178 struct completion open_ack; 179 struct completion open_req; 180 181 struct mutex intent_req_lock; 182 bool intent_req_result; 183 struct completion intent_req_comp; 184}; 185 186#define to_glink_channel(_ept) container_of(_ept, struct glink_channel, ept) 187 188static const struct rpmsg_endpoint_ops glink_endpoint_ops; 189 190#define RPM_CMD_VERSION 0 191#define RPM_CMD_VERSION_ACK 1 192#define RPM_CMD_OPEN 2 193#define RPM_CMD_CLOSE 3 194#define RPM_CMD_OPEN_ACK 4 195#define RPM_CMD_INTENT 5 196#define RPM_CMD_RX_DONE 6 197#define RPM_CMD_RX_INTENT_REQ 7 198#define RPM_CMD_RX_INTENT_REQ_ACK 8 199#define RPM_CMD_TX_DATA 9 200#define RPM_CMD_CLOSE_ACK 11 201#define RPM_CMD_TX_DATA_CONT 12 202#define RPM_CMD_READ_NOTIF 13 203#define RPM_CMD_RX_DONE_W_REUSE 14 204 205#define GLINK_FEATURE_INTENTLESS BIT(1) 206 207static void qcom_glink_rx_done_work(struct work_struct *work); 208 209static struct glink_channel *qcom_glink_alloc_channel(struct qcom_glink *glink, 210 const char *name) 211{ 212 struct glink_channel *channel; 213 214 channel = kzalloc(sizeof(*channel), GFP_KERNEL); 215 if (!channel) 216 return ERR_PTR(-ENOMEM); 217 218 /* Setup glink internal glink_channel data */ 219 spin_lock_init(&channel->recv_lock); 220 spin_lock_init(&channel->intent_lock); 221 mutex_init(&channel->intent_req_lock); 222 223 channel->glink = glink; 224 channel->name = kstrdup(name, GFP_KERNEL); 225 if (!channel->name) { 226 kfree(channel); 227 return ERR_PTR(-ENOMEM); 228 } 229 230 init_completion(&channel->open_req); 231 init_completion(&channel->open_ack); 232 init_completion(&channel->intent_req_comp); 233 234 INIT_LIST_HEAD(&channel->done_intents); 235 INIT_WORK(&channel->intent_work, qcom_glink_rx_done_work); 236 237 idr_init(&channel->liids); 238 idr_init(&channel->riids); 239 kref_init(&channel->refcount); 240 241 return channel; 242} 243 244static void qcom_glink_channel_release(struct kref *ref) 245{ 246 struct glink_channel *channel = container_of(ref, struct glink_channel, 247 refcount); 248 struct glink_core_rx_intent *intent; 249 struct glink_core_rx_intent *tmp; 250 unsigned long flags; 251 int iid; 252 253 /* cancel pending rx_done work */ 254 cancel_work_sync(&channel->intent_work); 255 256 spin_lock_irqsave(&channel->intent_lock, flags); 257 /* Free all non-reuse intents pending rx_done work */ 258 list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) { 259 if (!intent->reuse) { 260 kfree(intent->data); 261 kfree(intent); 262 } 263 } 264 265 idr_for_each_entry(&channel->liids, tmp, iid) { 266 kfree(tmp->data); 267 kfree(tmp); 268 } 269 idr_destroy(&channel->liids); 270 271 idr_for_each_entry(&channel->riids, tmp, iid) 272 kfree(tmp); 273 idr_destroy(&channel->riids); 274 spin_unlock_irqrestore(&channel->intent_lock, flags); 275 276 kfree(channel->name); 277 kfree(channel); 278} 279 280static size_t qcom_glink_rx_avail(struct qcom_glink *glink) 281{ 282 return glink->rx_pipe->avail(glink->rx_pipe); 283} 284 285static void qcom_glink_rx_peak(struct qcom_glink *glink, 286 void *data, unsigned int offset, size_t count) 287{ 288 glink->rx_pipe->peak(glink->rx_pipe, data, offset, count); 289} 290 291static void qcom_glink_rx_advance(struct qcom_glink *glink, size_t count) 292{ 293 glink->rx_pipe->advance(glink->rx_pipe, count); 294} 295 296static size_t qcom_glink_tx_avail(struct qcom_glink *glink) 297{ 298 return glink->tx_pipe->avail(glink->tx_pipe); 299} 300 301static void qcom_glink_tx_write(struct qcom_glink *glink, 302 const void *hdr, size_t hlen, 303 const void *data, size_t dlen) 304{ 305 glink->tx_pipe->write(glink->tx_pipe, hdr, hlen, data, dlen); 306} 307 308static int qcom_glink_tx(struct qcom_glink *glink, 309 const void *hdr, size_t hlen, 310 const void *data, size_t dlen, bool wait) 311{ 312 unsigned int tlen = hlen + dlen; 313 unsigned long flags; 314 int ret = 0; 315 316 /* Reject packets that are too big */ 317 if (tlen >= glink->tx_pipe->length) 318 return -EINVAL; 319 320 spin_lock_irqsave(&glink->tx_lock, flags); 321 322 while (qcom_glink_tx_avail(glink) < tlen) { 323 if (!wait) { 324 ret = -EAGAIN; 325 goto out; 326 } 327 328 /* Wait without holding the tx_lock */ 329 spin_unlock_irqrestore(&glink->tx_lock, flags); 330 331 usleep_range(10000, 15000); 332 333 spin_lock_irqsave(&glink->tx_lock, flags); 334 } 335 336 qcom_glink_tx_write(glink, hdr, hlen, data, dlen); 337 338 mbox_send_message(glink->mbox_chan, NULL); 339 mbox_client_txdone(glink->mbox_chan, 0); 340 341out: 342 spin_unlock_irqrestore(&glink->tx_lock, flags); 343 344 return ret; 345} 346 347static int qcom_glink_send_version(struct qcom_glink *glink) 348{ 349 struct glink_msg msg; 350 351 msg.cmd = cpu_to_le16(RPM_CMD_VERSION); 352 msg.param1 = cpu_to_le16(GLINK_VERSION_1); 353 msg.param2 = cpu_to_le32(glink->features); 354 355 return qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); 356} 357 358static void qcom_glink_send_version_ack(struct qcom_glink *glink) 359{ 360 struct glink_msg msg; 361 362 msg.cmd = cpu_to_le16(RPM_CMD_VERSION_ACK); 363 msg.param1 = cpu_to_le16(GLINK_VERSION_1); 364 msg.param2 = cpu_to_le32(glink->features); 365 366 qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); 367} 368 369static void qcom_glink_send_open_ack(struct qcom_glink *glink, 370 struct glink_channel *channel) 371{ 372 struct glink_msg msg; 373 374 msg.cmd = cpu_to_le16(RPM_CMD_OPEN_ACK); 375 msg.param1 = cpu_to_le16(channel->rcid); 376 msg.param2 = cpu_to_le32(0); 377 378 qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); 379} 380 381static void qcom_glink_handle_intent_req_ack(struct qcom_glink *glink, 382 unsigned int cid, bool granted) 383{ 384 struct glink_channel *channel; 385 unsigned long flags; 386 387 spin_lock_irqsave(&glink->idr_lock, flags); 388 channel = idr_find(&glink->rcids, cid); 389 spin_unlock_irqrestore(&glink->idr_lock, flags); 390 if (!channel) { 391 dev_err(glink->dev, "unable to find channel\n"); 392 return; 393 } 394 395 channel->intent_req_result = granted; 396 complete(&channel->intent_req_comp); 397} 398 399/** 400 * qcom_glink_send_open_req() - send a RPM_CMD_OPEN request to the remote 401 * @glink: Ptr to the glink edge 402 * @channel: Ptr to the channel that the open req is sent 403 * 404 * Allocates a local channel id and sends a RPM_CMD_OPEN message to the remote. 405 * Will return with refcount held, regardless of outcome. 406 * 407 * Returns 0 on success, negative errno otherwise. 408 */ 409static int qcom_glink_send_open_req(struct qcom_glink *glink, 410 struct glink_channel *channel) 411{ 412 struct { 413 struct glink_msg msg; 414 u8 name[GLINK_NAME_SIZE]; 415 } __packed req; 416 int name_len = strlen(channel->name) + 1; 417 int req_len = ALIGN(sizeof(req.msg) + name_len, 8); 418 int ret; 419 unsigned long flags; 420 421 kref_get(&channel->refcount); 422 423 spin_lock_irqsave(&glink->idr_lock, flags); 424 ret = idr_alloc_cyclic(&glink->lcids, channel, 425 RPM_GLINK_CID_MIN, RPM_GLINK_CID_MAX, 426 GFP_ATOMIC); 427 spin_unlock_irqrestore(&glink->idr_lock, flags); 428 if (ret < 0) 429 return ret; 430 431 channel->lcid = ret; 432 433 req.msg.cmd = cpu_to_le16(RPM_CMD_OPEN); 434 req.msg.param1 = cpu_to_le16(channel->lcid); 435 req.msg.param2 = cpu_to_le32(name_len); 436 strcpy(req.name, channel->name); 437 438 ret = qcom_glink_tx(glink, &req, req_len, NULL, 0, true); 439 if (ret) 440 goto remove_idr; 441 442 return 0; 443 444remove_idr: 445 spin_lock_irqsave(&glink->idr_lock, flags); 446 idr_remove(&glink->lcids, channel->lcid); 447 channel->lcid = 0; 448 spin_unlock_irqrestore(&glink->idr_lock, flags); 449 450 return ret; 451} 452 453static void qcom_glink_send_close_req(struct qcom_glink *glink, 454 struct glink_channel *channel) 455{ 456 struct glink_msg req; 457 458 req.cmd = cpu_to_le16(RPM_CMD_CLOSE); 459 req.param1 = cpu_to_le16(channel->lcid); 460 req.param2 = 0; 461 462 qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true); 463} 464 465static void qcom_glink_send_close_ack(struct qcom_glink *glink, 466 unsigned int rcid) 467{ 468 struct glink_msg req; 469 470 req.cmd = cpu_to_le16(RPM_CMD_CLOSE_ACK); 471 req.param1 = cpu_to_le16(rcid); 472 req.param2 = 0; 473 474 qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true); 475} 476 477static void qcom_glink_rx_done_work(struct work_struct *work) 478{ 479 struct glink_channel *channel = container_of(work, struct glink_channel, 480 intent_work); 481 struct qcom_glink *glink = channel->glink; 482 struct glink_core_rx_intent *intent, *tmp; 483 struct { 484 u16 id; 485 u16 lcid; 486 u32 liid; 487 } __packed cmd; 488 489 unsigned int cid = channel->lcid; 490 unsigned int iid; 491 bool reuse; 492 unsigned long flags; 493 494 spin_lock_irqsave(&channel->intent_lock, flags); 495 list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) { 496 list_del(&intent->node); 497 spin_unlock_irqrestore(&channel->intent_lock, flags); 498 iid = intent->id; 499 reuse = intent->reuse; 500 501 cmd.id = reuse ? RPM_CMD_RX_DONE_W_REUSE : RPM_CMD_RX_DONE; 502 cmd.lcid = cid; 503 cmd.liid = iid; 504 505 qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); 506 if (!reuse) { 507 kfree(intent->data); 508 kfree(intent); 509 } 510 spin_lock_irqsave(&channel->intent_lock, flags); 511 } 512 spin_unlock_irqrestore(&channel->intent_lock, flags); 513} 514 515static void qcom_glink_rx_done(struct qcom_glink *glink, 516 struct glink_channel *channel, 517 struct glink_core_rx_intent *intent) 518{ 519 /* We don't send RX_DONE to intentless systems */ 520 if (glink->intentless) { 521 kfree(intent->data); 522 kfree(intent); 523 return; 524 } 525 526 /* Take it off the tree of receive intents */ 527 if (!intent->reuse) { 528 spin_lock(&channel->intent_lock); 529 idr_remove(&channel->liids, intent->id); 530 spin_unlock(&channel->intent_lock); 531 } 532 533 /* Schedule the sending of a rx_done indication */ 534 spin_lock(&channel->intent_lock); 535 list_add_tail(&intent->node, &channel->done_intents); 536 spin_unlock(&channel->intent_lock); 537 538 schedule_work(&channel->intent_work); 539} 540 541/** 542 * qcom_glink_receive_version() - receive version/features from remote system 543 * 544 * @glink: pointer to transport interface 545 * @version: remote version 546 * @features: remote features 547 * 548 * This function is called in response to a remote-initiated version/feature 549 * negotiation sequence. 550 */ 551static void qcom_glink_receive_version(struct qcom_glink *glink, 552 u32 version, 553 u32 features) 554{ 555 switch (version) { 556 case 0: 557 break; 558 case GLINK_VERSION_1: 559 glink->features &= features; 560 fallthrough; 561 default: 562 qcom_glink_send_version_ack(glink); 563 break; 564 } 565} 566 567/** 568 * qcom_glink_receive_version_ack() - receive negotiation ack from remote system 569 * 570 * @glink: pointer to transport interface 571 * @version: remote version response 572 * @features: remote features response 573 * 574 * This function is called in response to a local-initiated version/feature 575 * negotiation sequence and is the counter-offer from the remote side based 576 * upon the initial version and feature set requested. 577 */ 578static void qcom_glink_receive_version_ack(struct qcom_glink *glink, 579 u32 version, 580 u32 features) 581{ 582 switch (version) { 583 case 0: 584 /* Version negotiation failed */ 585 break; 586 case GLINK_VERSION_1: 587 if (features == glink->features) 588 break; 589 590 glink->features &= features; 591 fallthrough; 592 default: 593 qcom_glink_send_version(glink); 594 break; 595 } 596} 597 598/** 599 * qcom_glink_send_intent_req_ack() - convert an rx intent request ack cmd to 600 * wire format and transmit 601 * @glink: The transport to transmit on. 602 * @channel: The glink channel 603 * @granted: The request response to encode. 604 * 605 * Return: 0 on success or standard Linux error code. 606 */ 607static int qcom_glink_send_intent_req_ack(struct qcom_glink *glink, 608 struct glink_channel *channel, 609 bool granted) 610{ 611 struct glink_msg msg; 612 613 msg.cmd = cpu_to_le16(RPM_CMD_RX_INTENT_REQ_ACK); 614 msg.param1 = cpu_to_le16(channel->lcid); 615 msg.param2 = cpu_to_le32(granted); 616 617 qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); 618 619 return 0; 620} 621 622/** 623 * qcom_glink_advertise_intent - convert an rx intent cmd to wire format and 624 * transmit 625 * @glink: The transport to transmit on. 626 * @channel: The local channel 627 * @intent: The intent to pass on to remote. 628 * 629 * Return: 0 on success or standard Linux error code. 630 */ 631static int qcom_glink_advertise_intent(struct qcom_glink *glink, 632 struct glink_channel *channel, 633 struct glink_core_rx_intent *intent) 634{ 635 struct command { 636 __le16 id; 637 __le16 lcid; 638 __le32 count; 639 __le32 size; 640 __le32 liid; 641 } __packed; 642 struct command cmd; 643 644 cmd.id = cpu_to_le16(RPM_CMD_INTENT); 645 cmd.lcid = cpu_to_le16(channel->lcid); 646 cmd.count = cpu_to_le32(1); 647 cmd.size = cpu_to_le32(intent->size); 648 cmd.liid = cpu_to_le32(intent->id); 649 650 qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); 651 652 return 0; 653} 654 655static struct glink_core_rx_intent * 656qcom_glink_alloc_intent(struct qcom_glink *glink, 657 struct glink_channel *channel, 658 size_t size, 659 bool reuseable) 660{ 661 struct glink_core_rx_intent *intent; 662 int ret; 663 unsigned long flags; 664 665 intent = kzalloc(sizeof(*intent), GFP_KERNEL); 666 if (!intent) 667 return NULL; 668 669 intent->data = kzalloc(size, GFP_KERNEL); 670 if (!intent->data) 671 goto free_intent; 672 673 spin_lock_irqsave(&channel->intent_lock, flags); 674 ret = idr_alloc_cyclic(&channel->liids, intent, 1, -1, GFP_ATOMIC); 675 if (ret < 0) { 676 spin_unlock_irqrestore(&channel->intent_lock, flags); 677 goto free_data; 678 } 679 spin_unlock_irqrestore(&channel->intent_lock, flags); 680 681 intent->id = ret; 682 intent->size = size; 683 intent->reuse = reuseable; 684 685 return intent; 686 687free_data: 688 kfree(intent->data); 689free_intent: 690 kfree(intent); 691 return NULL; 692} 693 694static void qcom_glink_handle_rx_done(struct qcom_glink *glink, 695 u32 cid, uint32_t iid, 696 bool reuse) 697{ 698 struct glink_core_rx_intent *intent; 699 struct glink_channel *channel; 700 unsigned long flags; 701 702 spin_lock_irqsave(&glink->idr_lock, flags); 703 channel = idr_find(&glink->rcids, cid); 704 spin_unlock_irqrestore(&glink->idr_lock, flags); 705 if (!channel) { 706 dev_err(glink->dev, "invalid channel id received\n"); 707 return; 708 } 709 710 spin_lock_irqsave(&channel->intent_lock, flags); 711 intent = idr_find(&channel->riids, iid); 712 713 if (!intent) { 714 spin_unlock_irqrestore(&channel->intent_lock, flags); 715 dev_err(glink->dev, "invalid intent id received\n"); 716 return; 717 } 718 719 intent->in_use = false; 720 721 if (!reuse) { 722 idr_remove(&channel->riids, intent->id); 723 kfree(intent); 724 } 725 spin_unlock_irqrestore(&channel->intent_lock, flags); 726} 727 728/** 729 * qcom_glink_handle_intent_req() - Receive a request for rx_intent 730 * from remote side 731 * @glink: Pointer to the transport interface 732 * @cid: Remote channel ID 733 * @size: size of the intent 734 * 735 * The function searches for the local channel to which the request for 736 * rx_intent has arrived and allocates and notifies the remote back 737 */ 738static void qcom_glink_handle_intent_req(struct qcom_glink *glink, 739 u32 cid, size_t size) 740{ 741 struct glink_core_rx_intent *intent; 742 struct glink_channel *channel; 743 unsigned long flags; 744 745 spin_lock_irqsave(&glink->idr_lock, flags); 746 channel = idr_find(&glink->rcids, cid); 747 spin_unlock_irqrestore(&glink->idr_lock, flags); 748 749 if (!channel) { 750 pr_err("%s channel not found for cid %d\n", __func__, cid); 751 return; 752 } 753 754 intent = qcom_glink_alloc_intent(glink, channel, size, false); 755 if (intent) 756 qcom_glink_advertise_intent(glink, channel, intent); 757 758 qcom_glink_send_intent_req_ack(glink, channel, !!intent); 759} 760 761static int qcom_glink_rx_defer(struct qcom_glink *glink, size_t extra) 762{ 763 struct glink_defer_cmd *dcmd; 764 765 extra = ALIGN(extra, 8); 766 767 if (qcom_glink_rx_avail(glink) < sizeof(struct glink_msg) + extra) { 768 dev_dbg(glink->dev, "Insufficient data in rx fifo"); 769 return -ENXIO; 770 } 771 772 dcmd = kzalloc(sizeof(*dcmd) + extra, GFP_ATOMIC); 773 if (!dcmd) 774 return -ENOMEM; 775 776 INIT_LIST_HEAD(&dcmd->node); 777 778 qcom_glink_rx_peak(glink, &dcmd->msg, 0, sizeof(dcmd->msg) + extra); 779 780 spin_lock(&glink->rx_lock); 781 list_add_tail(&dcmd->node, &glink->rx_queue); 782 spin_unlock(&glink->rx_lock); 783 784 schedule_work(&glink->rx_work); 785 qcom_glink_rx_advance(glink, sizeof(dcmd->msg) + extra); 786 787 return 0; 788} 789 790static int qcom_glink_rx_data(struct qcom_glink *glink, size_t avail) 791{ 792 struct glink_core_rx_intent *intent; 793 struct glink_channel *channel; 794 struct { 795 struct glink_msg msg; 796 __le32 chunk_size; 797 __le32 left_size; 798 } __packed hdr; 799 unsigned int chunk_size; 800 unsigned int left_size; 801 unsigned int rcid; 802 unsigned int liid; 803 int ret = 0; 804 unsigned long flags; 805 806 if (avail < sizeof(hdr)) { 807 dev_dbg(glink->dev, "Not enough data in fifo\n"); 808 return -EAGAIN; 809 } 810 811 qcom_glink_rx_peak(glink, &hdr, 0, sizeof(hdr)); 812 chunk_size = le32_to_cpu(hdr.chunk_size); 813 left_size = le32_to_cpu(hdr.left_size); 814 815 if (avail < sizeof(hdr) + chunk_size) { 816 dev_dbg(glink->dev, "Payload not yet in fifo\n"); 817 return -EAGAIN; 818 } 819 820 rcid = le16_to_cpu(hdr.msg.param1); 821 spin_lock_irqsave(&glink->idr_lock, flags); 822 channel = idr_find(&glink->rcids, rcid); 823 spin_unlock_irqrestore(&glink->idr_lock, flags); 824 if (!channel) { 825 dev_dbg(glink->dev, "Data on non-existing channel\n"); 826 827 /* Drop the message */ 828 goto advance_rx; 829 } 830 831 if (glink->intentless) { 832 /* Might have an ongoing, fragmented, message to append */ 833 if (!channel->buf) { 834 intent = kzalloc(sizeof(*intent), GFP_ATOMIC); 835 if (!intent) 836 return -ENOMEM; 837 838 intent->data = kmalloc(chunk_size + left_size, 839 GFP_ATOMIC); 840 if (!intent->data) { 841 kfree(intent); 842 return -ENOMEM; 843 } 844 845 intent->id = 0xbabababa; 846 intent->size = chunk_size + left_size; 847 intent->offset = 0; 848 849 channel->buf = intent; 850 } else { 851 intent = channel->buf; 852 } 853 } else { 854 liid = le32_to_cpu(hdr.msg.param2); 855 856 spin_lock_irqsave(&channel->intent_lock, flags); 857 intent = idr_find(&channel->liids, liid); 858 spin_unlock_irqrestore(&channel->intent_lock, flags); 859 860 if (!intent) { 861 dev_err(glink->dev, 862 "no intent found for channel %s intent %d", 863 channel->name, liid); 864 ret = -ENOENT; 865 goto advance_rx; 866 } 867 } 868 869 if (intent->size - intent->offset < chunk_size) { 870 dev_err(glink->dev, "Insufficient space in intent\n"); 871 872 /* The packet header lied, drop payload */ 873 goto advance_rx; 874 } 875 876 qcom_glink_rx_peak(glink, intent->data + intent->offset, 877 sizeof(hdr), chunk_size); 878 intent->offset += chunk_size; 879 880 /* Handle message when no fragments remain to be received */ 881 if (!left_size) { 882 spin_lock(&channel->recv_lock); 883 if (channel->ept.cb) { 884 channel->ept.cb(channel->ept.rpdev, 885 intent->data, 886 intent->offset, 887 channel->ept.priv, 888 RPMSG_ADDR_ANY); 889 } 890 spin_unlock(&channel->recv_lock); 891 892 intent->offset = 0; 893 channel->buf = NULL; 894 895 qcom_glink_rx_done(glink, channel, intent); 896 } 897 898advance_rx: 899 qcom_glink_rx_advance(glink, ALIGN(sizeof(hdr) + chunk_size, 8)); 900 901 return ret; 902} 903 904static void qcom_glink_handle_intent(struct qcom_glink *glink, 905 unsigned int cid, 906 unsigned int count, 907 size_t avail) 908{ 909 struct glink_core_rx_intent *intent; 910 struct glink_channel *channel; 911 struct intent_pair { 912 __le32 size; 913 __le32 iid; 914 }; 915 916 struct { 917 struct glink_msg msg; 918 struct intent_pair intents[]; 919 } __packed * msg; 920 921 const size_t msglen = struct_size(msg, intents, count); 922 int ret; 923 int i; 924 unsigned long flags; 925 926 if (avail < msglen) { 927 dev_dbg(glink->dev, "Not enough data in fifo\n"); 928 return; 929 } 930 931 spin_lock_irqsave(&glink->idr_lock, flags); 932 channel = idr_find(&glink->rcids, cid); 933 spin_unlock_irqrestore(&glink->idr_lock, flags); 934 if (!channel) { 935 dev_err(glink->dev, "intents for non-existing channel\n"); 936 qcom_glink_rx_advance(glink, ALIGN(msglen, 8)); 937 return; 938 } 939 940 msg = kmalloc(msglen, GFP_ATOMIC); 941 if (!msg) 942 return; 943 944 qcom_glink_rx_peak(glink, msg, 0, msglen); 945 946 for (i = 0; i < count; ++i) { 947 intent = kzalloc(sizeof(*intent), GFP_ATOMIC); 948 if (!intent) 949 break; 950 951 intent->id = le32_to_cpu(msg->intents[i].iid); 952 intent->size = le32_to_cpu(msg->intents[i].size); 953 954 spin_lock_irqsave(&channel->intent_lock, flags); 955 ret = idr_alloc(&channel->riids, intent, 956 intent->id, intent->id + 1, GFP_ATOMIC); 957 spin_unlock_irqrestore(&channel->intent_lock, flags); 958 959 if (ret < 0) 960 dev_err(glink->dev, "failed to store remote intent\n"); 961 } 962 963 kfree(msg); 964 qcom_glink_rx_advance(glink, ALIGN(msglen, 8)); 965} 966 967static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid) 968{ 969 struct glink_channel *channel; 970 971 spin_lock(&glink->idr_lock); 972 channel = idr_find(&glink->lcids, lcid); 973 spin_unlock(&glink->idr_lock); 974 if (!channel) { 975 dev_err(glink->dev, "Invalid open ack packet\n"); 976 return -EINVAL; 977 } 978 979 complete_all(&channel->open_ack); 980 981 return 0; 982} 983 984static irqreturn_t qcom_glink_native_intr(int irq, void *data) 985{ 986 struct qcom_glink *glink = data; 987 struct glink_msg msg; 988 unsigned int param1; 989 unsigned int param2; 990 unsigned int avail; 991 unsigned int cmd; 992 int ret = 0; 993 994 for (;;) { 995 avail = qcom_glink_rx_avail(glink); 996 if (avail < sizeof(msg)) 997 break; 998 999 qcom_glink_rx_peak(glink, &msg, 0, sizeof(msg)); 1000 1001 cmd = le16_to_cpu(msg.cmd); 1002 param1 = le16_to_cpu(msg.param1); 1003 param2 = le32_to_cpu(msg.param2); 1004 1005 switch (cmd) { 1006 case RPM_CMD_VERSION: 1007 case RPM_CMD_VERSION_ACK: 1008 case RPM_CMD_CLOSE: 1009 case RPM_CMD_CLOSE_ACK: 1010 case RPM_CMD_RX_INTENT_REQ: 1011 ret = qcom_glink_rx_defer(glink, 0); 1012 break; 1013 case RPM_CMD_OPEN_ACK: 1014 ret = qcom_glink_rx_open_ack(glink, param1); 1015 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); 1016 break; 1017 case RPM_CMD_OPEN: 1018 ret = qcom_glink_rx_defer(glink, param2); 1019 break; 1020 case RPM_CMD_TX_DATA: 1021 case RPM_CMD_TX_DATA_CONT: 1022 ret = qcom_glink_rx_data(glink, avail); 1023 break; 1024 case RPM_CMD_READ_NOTIF: 1025 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); 1026 1027 mbox_send_message(glink->mbox_chan, NULL); 1028 mbox_client_txdone(glink->mbox_chan, 0); 1029 break; 1030 case RPM_CMD_INTENT: 1031 qcom_glink_handle_intent(glink, param1, param2, avail); 1032 break; 1033 case RPM_CMD_RX_DONE: 1034 qcom_glink_handle_rx_done(glink, param1, param2, false); 1035 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); 1036 break; 1037 case RPM_CMD_RX_DONE_W_REUSE: 1038 qcom_glink_handle_rx_done(glink, param1, param2, true); 1039 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); 1040 break; 1041 case RPM_CMD_RX_INTENT_REQ_ACK: 1042 qcom_glink_handle_intent_req_ack(glink, param1, param2); 1043 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); 1044 break; 1045 default: 1046 dev_err(glink->dev, "unhandled rx cmd: %d\n", cmd); 1047 ret = -EINVAL; 1048 break; 1049 } 1050 1051 if (ret) 1052 break; 1053 } 1054 1055 return IRQ_HANDLED; 1056} 1057 1058/* Locally initiated rpmsg_create_ept */ 1059static struct glink_channel *qcom_glink_create_local(struct qcom_glink *glink, 1060 const char *name) 1061{ 1062 struct glink_channel *channel; 1063 int ret; 1064 unsigned long flags; 1065 1066 channel = qcom_glink_alloc_channel(glink, name); 1067 if (IS_ERR(channel)) 1068 return ERR_CAST(channel); 1069 1070 ret = qcom_glink_send_open_req(glink, channel); 1071 if (ret) 1072 goto release_channel; 1073 1074 ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ); 1075 if (!ret) 1076 goto err_timeout; 1077 1078 ret = wait_for_completion_timeout(&channel->open_req, 5 * HZ); 1079 if (!ret) 1080 goto err_timeout; 1081 1082 qcom_glink_send_open_ack(glink, channel); 1083 1084 return channel; 1085 1086err_timeout: 1087 /* qcom_glink_send_open_req() did register the channel in lcids*/ 1088 spin_lock_irqsave(&glink->idr_lock, flags); 1089 idr_remove(&glink->lcids, channel->lcid); 1090 spin_unlock_irqrestore(&glink->idr_lock, flags); 1091 1092release_channel: 1093 /* Release qcom_glink_send_open_req() reference */ 1094 kref_put(&channel->refcount, qcom_glink_channel_release); 1095 /* Release qcom_glink_alloc_channel() reference */ 1096 kref_put(&channel->refcount, qcom_glink_channel_release); 1097 1098 return ERR_PTR(-ETIMEDOUT); 1099} 1100 1101/* Remote initiated rpmsg_create_ept */ 1102static int qcom_glink_create_remote(struct qcom_glink *glink, 1103 struct glink_channel *channel) 1104{ 1105 int ret; 1106 1107 qcom_glink_send_open_ack(glink, channel); 1108 1109 ret = qcom_glink_send_open_req(glink, channel); 1110 if (ret) 1111 goto close_link; 1112 1113 ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ); 1114 if (!ret) { 1115 ret = -ETIMEDOUT; 1116 goto close_link; 1117 } 1118 1119 return 0; 1120 1121close_link: 1122 /* 1123 * Send a close request to "undo" our open-ack. The close-ack will 1124 * release qcom_glink_send_open_req() reference and the last reference 1125 * will be relesed after receiving remote_close or transport unregister 1126 * by calling qcom_glink_native_remove(). 1127 */ 1128 qcom_glink_send_close_req(glink, channel); 1129 1130 return ret; 1131} 1132 1133static struct rpmsg_endpoint *qcom_glink_create_ept(struct rpmsg_device *rpdev, 1134 rpmsg_rx_cb_t cb, 1135 void *priv, 1136 struct rpmsg_channel_info 1137 chinfo) 1138{ 1139 struct glink_channel *parent = to_glink_channel(rpdev->ept); 1140 struct glink_channel *channel; 1141 struct qcom_glink *glink = parent->glink; 1142 struct rpmsg_endpoint *ept; 1143 const char *name = chinfo.name; 1144 int cid; 1145 int ret; 1146 unsigned long flags; 1147 1148 spin_lock_irqsave(&glink->idr_lock, flags); 1149 idr_for_each_entry(&glink->rcids, channel, cid) { 1150 if (!strcmp(channel->name, name)) 1151 break; 1152 } 1153 spin_unlock_irqrestore(&glink->idr_lock, flags); 1154 1155 if (!channel) { 1156 channel = qcom_glink_create_local(glink, name); 1157 if (IS_ERR(channel)) 1158 return NULL; 1159 } else { 1160 ret = qcom_glink_create_remote(glink, channel); 1161 if (ret) 1162 return NULL; 1163 } 1164 1165 ept = &channel->ept; 1166 ept->rpdev = rpdev; 1167 ept->cb = cb; 1168 ept->priv = priv; 1169 ept->ops = &glink_endpoint_ops; 1170 1171 return ept; 1172} 1173 1174static int qcom_glink_announce_create(struct rpmsg_device *rpdev) 1175{ 1176 struct glink_channel *channel = to_glink_channel(rpdev->ept); 1177 struct device_node *np = rpdev->dev.of_node; 1178 struct qcom_glink *glink = channel->glink; 1179 struct glink_core_rx_intent *intent; 1180 const struct property *prop = NULL; 1181 __be32 defaults[] = { cpu_to_be32(SZ_1K), cpu_to_be32(5) }; 1182 int num_intents; 1183 int num_groups = 1; 1184 __be32 *val = defaults; 1185 int size; 1186 1187 if (glink->intentless || !completion_done(&channel->open_ack)) 1188 return 0; 1189 1190 prop = of_find_property(np, "qcom,intents", NULL); 1191 if (prop) { 1192 val = prop->value; 1193 num_groups = prop->length / sizeof(u32) / 2; 1194 } 1195 1196 /* Channel is now open, advertise base set of intents */ 1197 while (num_groups--) { 1198 size = be32_to_cpup(val++); 1199 num_intents = be32_to_cpup(val++); 1200 while (num_intents--) { 1201 intent = qcom_glink_alloc_intent(glink, channel, size, 1202 true); 1203 if (!intent) 1204 break; 1205 1206 qcom_glink_advertise_intent(glink, channel, intent); 1207 } 1208 } 1209 return 0; 1210} 1211 1212static void qcom_glink_destroy_ept(struct rpmsg_endpoint *ept) 1213{ 1214 struct glink_channel *channel = to_glink_channel(ept); 1215 struct qcom_glink *glink = channel->glink; 1216 unsigned long flags; 1217 1218 spin_lock_irqsave(&channel->recv_lock, flags); 1219 channel->ept.cb = NULL; 1220 spin_unlock_irqrestore(&channel->recv_lock, flags); 1221 1222 /* Decouple the potential rpdev from the channel */ 1223 channel->rpdev = NULL; 1224 1225 qcom_glink_send_close_req(glink, channel); 1226} 1227 1228static int qcom_glink_request_intent(struct qcom_glink *glink, 1229 struct glink_channel *channel, 1230 size_t size) 1231{ 1232 struct { 1233 u16 id; 1234 u16 cid; 1235 u32 size; 1236 } __packed cmd; 1237 1238 int ret; 1239 1240 mutex_lock(&channel->intent_req_lock); 1241 1242 reinit_completion(&channel->intent_req_comp); 1243 1244 cmd.id = RPM_CMD_RX_INTENT_REQ; 1245 cmd.cid = channel->lcid; 1246 cmd.size = size; 1247 1248 ret = qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); 1249 if (ret) 1250 goto unlock; 1251 1252 ret = wait_for_completion_timeout(&channel->intent_req_comp, 10 * HZ); 1253 if (!ret) { 1254 dev_err(glink->dev, "intent request timed out\n"); 1255 ret = -ETIMEDOUT; 1256 } else { 1257 ret = channel->intent_req_result ? 0 : -ECANCELED; 1258 } 1259 1260unlock: 1261 mutex_unlock(&channel->intent_req_lock); 1262 return ret; 1263} 1264 1265static int __qcom_glink_send(struct glink_channel *channel, 1266 void *data, int len, bool wait) 1267{ 1268 struct qcom_glink *glink = channel->glink; 1269 struct glink_core_rx_intent *intent = NULL; 1270 struct glink_core_rx_intent *tmp; 1271 int iid = 0; 1272 struct { 1273 struct glink_msg msg; 1274 __le32 chunk_size; 1275 __le32 left_size; 1276 } __packed req; 1277 int ret; 1278 unsigned long flags; 1279 1280 if (!glink->intentless) { 1281 while (!intent) { 1282 spin_lock_irqsave(&channel->intent_lock, flags); 1283 idr_for_each_entry(&channel->riids, tmp, iid) { 1284 if (tmp->size >= len && !tmp->in_use) { 1285 if (!intent) 1286 intent = tmp; 1287 else if (intent->size > tmp->size) 1288 intent = tmp; 1289 if (intent->size == len) 1290 break; 1291 } 1292 } 1293 if (intent) 1294 intent->in_use = true; 1295 spin_unlock_irqrestore(&channel->intent_lock, flags); 1296 1297 /* We found an available intent */ 1298 if (intent) 1299 break; 1300 1301 if (!wait) 1302 return -EBUSY; 1303 1304 ret = qcom_glink_request_intent(glink, channel, len); 1305 if (ret < 0) 1306 return ret; 1307 } 1308 1309 iid = intent->id; 1310 } 1311 1312 req.msg.cmd = cpu_to_le16(RPM_CMD_TX_DATA); 1313 req.msg.param1 = cpu_to_le16(channel->lcid); 1314 req.msg.param2 = cpu_to_le32(iid); 1315 req.chunk_size = cpu_to_le32(len); 1316 req.left_size = cpu_to_le32(0); 1317 1318 ret = qcom_glink_tx(glink, &req, sizeof(req), data, len, wait); 1319 1320 /* Mark intent available if we failed */ 1321 if (ret && intent) 1322 intent->in_use = false; 1323 1324 return ret; 1325} 1326 1327static int qcom_glink_send(struct rpmsg_endpoint *ept, void *data, int len) 1328{ 1329 struct glink_channel *channel = to_glink_channel(ept); 1330 1331 return __qcom_glink_send(channel, data, len, true); 1332} 1333 1334static int qcom_glink_trysend(struct rpmsg_endpoint *ept, void *data, int len) 1335{ 1336 struct glink_channel *channel = to_glink_channel(ept); 1337 1338 return __qcom_glink_send(channel, data, len, false); 1339} 1340 1341/* 1342 * Finds the device_node for the glink child interested in this channel. 1343 */ 1344static struct device_node *qcom_glink_match_channel(struct device_node *node, 1345 const char *channel) 1346{ 1347 struct device_node *child; 1348 const char *name; 1349 const char *key; 1350 int ret; 1351 1352 for_each_available_child_of_node(node, child) { 1353 key = "qcom,glink-channels"; 1354 ret = of_property_read_string(child, key, &name); 1355 if (ret) 1356 continue; 1357 1358 if (strcmp(name, channel) == 0) 1359 return child; 1360 } 1361 1362 return NULL; 1363} 1364 1365static const struct rpmsg_device_ops glink_device_ops = { 1366 .create_ept = qcom_glink_create_ept, 1367 .announce_create = qcom_glink_announce_create, 1368}; 1369 1370static const struct rpmsg_endpoint_ops glink_endpoint_ops = { 1371 .destroy_ept = qcom_glink_destroy_ept, 1372 .send = qcom_glink_send, 1373 .trysend = qcom_glink_trysend, 1374}; 1375 1376static void qcom_glink_rpdev_release(struct device *dev) 1377{ 1378 struct rpmsg_device *rpdev = to_rpmsg_device(dev); 1379 struct glink_channel *channel = to_glink_channel(rpdev->ept); 1380 1381 channel->rpdev = NULL; 1382 kfree(rpdev->driver_override); 1383 kfree(rpdev); 1384} 1385 1386static int qcom_glink_rx_open(struct qcom_glink *glink, unsigned int rcid, 1387 char *name) 1388{ 1389 struct glink_channel *channel; 1390 struct rpmsg_device *rpdev; 1391 bool create_device = false; 1392 struct device_node *node; 1393 int lcid; 1394 int ret; 1395 unsigned long flags; 1396 1397 spin_lock_irqsave(&glink->idr_lock, flags); 1398 idr_for_each_entry(&glink->lcids, channel, lcid) { 1399 if (!strcmp(channel->name, name)) 1400 break; 1401 } 1402 spin_unlock_irqrestore(&glink->idr_lock, flags); 1403 1404 if (!channel) { 1405 channel = qcom_glink_alloc_channel(glink, name); 1406 if (IS_ERR(channel)) 1407 return PTR_ERR(channel); 1408 1409 /* The opening dance was initiated by the remote */ 1410 create_device = true; 1411 } 1412 1413 spin_lock_irqsave(&glink->idr_lock, flags); 1414 ret = idr_alloc(&glink->rcids, channel, rcid, rcid + 1, GFP_ATOMIC); 1415 if (ret < 0) { 1416 dev_err(glink->dev, "Unable to insert channel into rcid list\n"); 1417 spin_unlock_irqrestore(&glink->idr_lock, flags); 1418 goto free_channel; 1419 } 1420 channel->rcid = ret; 1421 spin_unlock_irqrestore(&glink->idr_lock, flags); 1422 1423 complete_all(&channel->open_req); 1424 1425 if (create_device) { 1426 rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL); 1427 if (!rpdev) { 1428 ret = -ENOMEM; 1429 goto rcid_remove; 1430 } 1431 1432 rpdev->ept = &channel->ept; 1433 strncpy(rpdev->id.name, name, RPMSG_NAME_SIZE); 1434 rpdev->src = RPMSG_ADDR_ANY; 1435 rpdev->dst = RPMSG_ADDR_ANY; 1436 rpdev->ops = &glink_device_ops; 1437 1438 node = qcom_glink_match_channel(glink->dev->of_node, name); 1439 rpdev->dev.of_node = node; 1440 rpdev->dev.parent = glink->dev; 1441 rpdev->dev.release = qcom_glink_rpdev_release; 1442 1443 ret = rpmsg_register_device(rpdev); 1444 if (ret) 1445 goto rcid_remove; 1446 1447 channel->rpdev = rpdev; 1448 } 1449 1450 return 0; 1451 1452rcid_remove: 1453 spin_lock_irqsave(&glink->idr_lock, flags); 1454 idr_remove(&glink->rcids, channel->rcid); 1455 channel->rcid = 0; 1456 spin_unlock_irqrestore(&glink->idr_lock, flags); 1457free_channel: 1458 /* Release the reference, iff we took it */ 1459 if (create_device) 1460 kref_put(&channel->refcount, qcom_glink_channel_release); 1461 1462 return ret; 1463} 1464 1465static void qcom_glink_rx_close(struct qcom_glink *glink, unsigned int rcid) 1466{ 1467 struct rpmsg_channel_info chinfo; 1468 struct glink_channel *channel; 1469 unsigned long flags; 1470 1471 spin_lock_irqsave(&glink->idr_lock, flags); 1472 channel = idr_find(&glink->rcids, rcid); 1473 spin_unlock_irqrestore(&glink->idr_lock, flags); 1474 if (WARN(!channel, "close request on unknown channel\n")) 1475 return; 1476 1477 /* cancel pending rx_done work */ 1478 cancel_work_sync(&channel->intent_work); 1479 1480 if (channel->rpdev) { 1481 strscpy_pad(chinfo.name, channel->name, sizeof(chinfo.name)); 1482 chinfo.src = RPMSG_ADDR_ANY; 1483 chinfo.dst = RPMSG_ADDR_ANY; 1484 1485 rpmsg_unregister_device(glink->dev, &chinfo); 1486 } 1487 1488 qcom_glink_send_close_ack(glink, channel->rcid); 1489 1490 spin_lock_irqsave(&glink->idr_lock, flags); 1491 idr_remove(&glink->rcids, channel->rcid); 1492 channel->rcid = 0; 1493 spin_unlock_irqrestore(&glink->idr_lock, flags); 1494 1495 kref_put(&channel->refcount, qcom_glink_channel_release); 1496} 1497 1498static void qcom_glink_rx_close_ack(struct qcom_glink *glink, unsigned int lcid) 1499{ 1500 struct glink_channel *channel; 1501 unsigned long flags; 1502 1503 spin_lock_irqsave(&glink->idr_lock, flags); 1504 channel = idr_find(&glink->lcids, lcid); 1505 if (WARN(!channel, "close ack on unknown channel\n")) { 1506 spin_unlock_irqrestore(&glink->idr_lock, flags); 1507 return; 1508 } 1509 1510 idr_remove(&glink->lcids, channel->lcid); 1511 channel->lcid = 0; 1512 spin_unlock_irqrestore(&glink->idr_lock, flags); 1513 1514 kref_put(&channel->refcount, qcom_glink_channel_release); 1515} 1516 1517static void qcom_glink_work(struct work_struct *work) 1518{ 1519 struct qcom_glink *glink = container_of(work, struct qcom_glink, 1520 rx_work); 1521 struct glink_defer_cmd *dcmd; 1522 struct glink_msg *msg; 1523 unsigned long flags; 1524 unsigned int param1; 1525 unsigned int param2; 1526 unsigned int cmd; 1527 1528 for (;;) { 1529 spin_lock_irqsave(&glink->rx_lock, flags); 1530 if (list_empty(&glink->rx_queue)) { 1531 spin_unlock_irqrestore(&glink->rx_lock, flags); 1532 break; 1533 } 1534 dcmd = list_first_entry(&glink->rx_queue, 1535 struct glink_defer_cmd, node); 1536 list_del(&dcmd->node); 1537 spin_unlock_irqrestore(&glink->rx_lock, flags); 1538 1539 msg = &dcmd->msg; 1540 cmd = le16_to_cpu(msg->cmd); 1541 param1 = le16_to_cpu(msg->param1); 1542 param2 = le32_to_cpu(msg->param2); 1543 1544 switch (cmd) { 1545 case RPM_CMD_VERSION: 1546 qcom_glink_receive_version(glink, param1, param2); 1547 break; 1548 case RPM_CMD_VERSION_ACK: 1549 qcom_glink_receive_version_ack(glink, param1, param2); 1550 break; 1551 case RPM_CMD_OPEN: 1552 qcom_glink_rx_open(glink, param1, msg->data); 1553 break; 1554 case RPM_CMD_CLOSE: 1555 qcom_glink_rx_close(glink, param1); 1556 break; 1557 case RPM_CMD_CLOSE_ACK: 1558 qcom_glink_rx_close_ack(glink, param1); 1559 break; 1560 case RPM_CMD_RX_INTENT_REQ: 1561 qcom_glink_handle_intent_req(glink, param1, param2); 1562 break; 1563 default: 1564 WARN(1, "Unknown defer object %d\n", cmd); 1565 break; 1566 } 1567 1568 kfree(dcmd); 1569 } 1570} 1571 1572static void qcom_glink_cancel_rx_work(struct qcom_glink *glink) 1573{ 1574 struct glink_defer_cmd *dcmd; 1575 struct glink_defer_cmd *tmp; 1576 1577 /* cancel any pending deferred rx_work */ 1578 cancel_work_sync(&glink->rx_work); 1579 1580 list_for_each_entry_safe(dcmd, tmp, &glink->rx_queue, node) 1581 kfree(dcmd); 1582} 1583 1584static ssize_t rpmsg_name_show(struct device *dev, 1585 struct device_attribute *attr, char *buf) 1586{ 1587 int ret = 0; 1588 const char *name; 1589 1590 ret = of_property_read_string(dev->of_node, "label", &name); 1591 if (ret < 0) 1592 name = dev->of_node->name; 1593 1594 return snprintf(buf, RPMSG_NAME_SIZE, "%s\n", name); 1595} 1596static DEVICE_ATTR_RO(rpmsg_name); 1597 1598static struct attribute *qcom_glink_attrs[] = { 1599 &dev_attr_rpmsg_name.attr, 1600 NULL 1601}; 1602ATTRIBUTE_GROUPS(qcom_glink); 1603 1604static void qcom_glink_device_release(struct device *dev) 1605{ 1606 struct rpmsg_device *rpdev = to_rpmsg_device(dev); 1607 struct glink_channel *channel = to_glink_channel(rpdev->ept); 1608 1609 /* Release qcom_glink_alloc_channel() reference */ 1610 kref_put(&channel->refcount, qcom_glink_channel_release); 1611 kfree(rpdev->driver_override); 1612 kfree(rpdev); 1613} 1614 1615static int qcom_glink_create_chrdev(struct qcom_glink *glink) 1616{ 1617 struct rpmsg_device *rpdev; 1618 struct glink_channel *channel; 1619 1620 rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL); 1621 if (!rpdev) 1622 return -ENOMEM; 1623 1624 channel = qcom_glink_alloc_channel(glink, "rpmsg_chrdev"); 1625 if (IS_ERR(channel)) { 1626 kfree(rpdev); 1627 return PTR_ERR(channel); 1628 } 1629 channel->rpdev = rpdev; 1630 1631 rpdev->ept = &channel->ept; 1632 rpdev->ops = &glink_device_ops; 1633 rpdev->dev.parent = glink->dev; 1634 rpdev->dev.release = qcom_glink_device_release; 1635 1636 return rpmsg_chrdev_register_device(rpdev); 1637} 1638 1639struct qcom_glink *qcom_glink_native_probe(struct device *dev, 1640 unsigned long features, 1641 struct qcom_glink_pipe *rx, 1642 struct qcom_glink_pipe *tx, 1643 bool intentless) 1644{ 1645 int irq; 1646 int ret; 1647 struct qcom_glink *glink; 1648 1649 glink = devm_kzalloc(dev, sizeof(*glink), GFP_KERNEL); 1650 if (!glink) 1651 return ERR_PTR(-ENOMEM); 1652 1653 glink->dev = dev; 1654 glink->tx_pipe = tx; 1655 glink->rx_pipe = rx; 1656 1657 glink->features = features; 1658 glink->intentless = intentless; 1659 1660 spin_lock_init(&glink->tx_lock); 1661 spin_lock_init(&glink->rx_lock); 1662 INIT_LIST_HEAD(&glink->rx_queue); 1663 INIT_WORK(&glink->rx_work, qcom_glink_work); 1664 1665 spin_lock_init(&glink->idr_lock); 1666 idr_init(&glink->lcids); 1667 idr_init(&glink->rcids); 1668 1669 glink->dev->groups = qcom_glink_groups; 1670 1671 ret = device_add_groups(dev, qcom_glink_groups); 1672 if (ret) 1673 dev_err(dev, "failed to add groups\n"); 1674 1675 ret = of_property_read_string(dev->of_node, "label", &glink->name); 1676 if (ret < 0) 1677 glink->name = dev->of_node->name; 1678 1679 glink->mbox_client.dev = dev; 1680 glink->mbox_client.knows_txdone = true; 1681 glink->mbox_chan = mbox_request_channel(&glink->mbox_client, 0); 1682 if (IS_ERR(glink->mbox_chan)) { 1683 if (PTR_ERR(glink->mbox_chan) != -EPROBE_DEFER) 1684 dev_err(dev, "failed to acquire IPC channel\n"); 1685 return ERR_CAST(glink->mbox_chan); 1686 } 1687 1688 irq = of_irq_get(dev->of_node, 0); 1689 ret = devm_request_irq(dev, irq, 1690 qcom_glink_native_intr, 1691 IRQF_NO_SUSPEND | IRQF_SHARED, 1692 "glink-native", glink); 1693 if (ret) { 1694 dev_err(dev, "failed to request IRQ\n"); 1695 return ERR_PTR(ret); 1696 } 1697 1698 glink->irq = irq; 1699 1700 ret = qcom_glink_send_version(glink); 1701 if (ret) 1702 return ERR_PTR(ret); 1703 1704 ret = qcom_glink_create_chrdev(glink); 1705 if (ret) 1706 dev_err(glink->dev, "failed to register chrdev\n"); 1707 1708 return glink; 1709} 1710EXPORT_SYMBOL_GPL(qcom_glink_native_probe); 1711 1712static int qcom_glink_remove_device(struct device *dev, void *data) 1713{ 1714 device_unregister(dev); 1715 1716 return 0; 1717} 1718 1719void qcom_glink_native_remove(struct qcom_glink *glink) 1720{ 1721 struct glink_channel *channel; 1722 int cid; 1723 int ret; 1724 1725 disable_irq(glink->irq); 1726 qcom_glink_cancel_rx_work(glink); 1727 1728 ret = device_for_each_child(glink->dev, NULL, qcom_glink_remove_device); 1729 if (ret) 1730 dev_warn(glink->dev, "Can't remove GLINK devices: %d\n", ret); 1731 1732 /* Release any defunct local channels, waiting for close-ack */ 1733 idr_for_each_entry(&glink->lcids, channel, cid) 1734 kref_put(&channel->refcount, qcom_glink_channel_release); 1735 1736 /* Release any defunct local channels, waiting for close-req */ 1737 idr_for_each_entry(&glink->rcids, channel, cid) 1738 kref_put(&channel->refcount, qcom_glink_channel_release); 1739 1740 idr_destroy(&glink->lcids); 1741 idr_destroy(&glink->rcids); 1742 mbox_free_channel(glink->mbox_chan); 1743} 1744EXPORT_SYMBOL_GPL(qcom_glink_native_remove); 1745 1746void qcom_glink_native_unregister(struct qcom_glink *glink) 1747{ 1748 device_unregister(glink->dev); 1749} 1750EXPORT_SYMBOL_GPL(qcom_glink_native_unregister); 1751 1752MODULE_DESCRIPTION("Qualcomm GLINK driver"); 1753MODULE_LICENSE("GPL v2"); 1754