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