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