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 struct glink_core_rx_intent *intent; 245 struct glink_core_rx_intent *tmp; 246 unsigned long flags; 247 int iid; 248 249 /* cancel pending rx_done work */ 250 cancel_work_sync(&channel->intent_work); 251 252 spin_lock_irqsave(&channel->intent_lock, flags); 253 /* Free all non-reuse intents pending rx_done work */ 254 list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) { 255 if (!intent->reuse) { 256 kfree(intent->data); 257 kfree(intent); 258 } 259 } 260 261 idr_for_each_entry(&channel->liids, tmp, iid) { 262 kfree(tmp->data); 263 kfree(tmp); 264 } 265 idr_destroy(&channel->liids); 266 267 idr_for_each_entry(&channel->riids, tmp, iid) 268 kfree(tmp); 269 idr_destroy(&channel->riids); 270 spin_unlock_irqrestore(&channel->intent_lock, flags); 271 272 kfree(channel->name); 273 kfree(channel); 274 } 275 276 static size_t qcom_glink_rx_avail(struct qcom_glink *glink) 277 { 278 return glink->rx_pipe->avail(glink->rx_pipe); 279 } 280 281 static void qcom_glink_rx_peak(struct qcom_glink *glink, 282 void *data, unsigned int offset, size_t count) 283 { 284 glink->rx_pipe->peak(glink->rx_pipe, data, offset, count); 285 } 286 287 static void qcom_glink_rx_advance(struct qcom_glink *glink, size_t count) 288 { 289 glink->rx_pipe->advance(glink->rx_pipe, count); 290 } 291 292 static size_t qcom_glink_tx_avail(struct qcom_glink *glink) 293 { 294 return glink->tx_pipe->avail(glink->tx_pipe); 295 } 296 297 static void qcom_glink_tx_write(struct qcom_glink *glink, 298 const void *hdr, size_t hlen, 299 const void *data, size_t dlen) 300 { 301 glink->tx_pipe->write(glink->tx_pipe, hdr, hlen, data, dlen); 302 } 303 304 static int qcom_glink_tx(struct qcom_glink *glink, 305 const void *hdr, size_t hlen, 306 const void *data, size_t dlen, bool wait) 307 { 308 unsigned int tlen = hlen + dlen; 309 unsigned long flags; 310 int ret = 0; 311 312 /* Reject packets that are too big */ 313 if (tlen >= glink->tx_pipe->length) 314 return -EINVAL; 315 316 spin_lock_irqsave(&glink->tx_lock, flags); 317 318 while (qcom_glink_tx_avail(glink) < tlen) { 319 if (!wait) { 320 ret = -EAGAIN; 321 goto out; 322 } 323 324 /* Wait without holding the tx_lock */ 325 spin_unlock_irqrestore(&glink->tx_lock, flags); 326 327 usleep_range(10000, 15000); 328 329 spin_lock_irqsave(&glink->tx_lock, flags); 330 } 331 332 qcom_glink_tx_write(glink, hdr, hlen, data, dlen); 333 334 mbox_send_message(glink->mbox_chan, NULL); 335 mbox_client_txdone(glink->mbox_chan, 0); 336 337 out: 338 spin_unlock_irqrestore(&glink->tx_lock, flags); 339 340 return ret; 341 } 342 343 static int qcom_glink_send_version(struct qcom_glink *glink) 344 { 345 struct glink_msg msg; 346 347 msg.cmd = cpu_to_le16(RPM_CMD_VERSION); 348 msg.param1 = cpu_to_le16(GLINK_VERSION_1); 349 msg.param2 = cpu_to_le32(glink->features); 350 351 return qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); 352 } 353 354 static void qcom_glink_send_version_ack(struct qcom_glink *glink) 355 { 356 struct glink_msg msg; 357 358 msg.cmd = cpu_to_le16(RPM_CMD_VERSION_ACK); 359 msg.param1 = cpu_to_le16(GLINK_VERSION_1); 360 msg.param2 = cpu_to_le32(glink->features); 361 362 qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); 363 } 364 365 static void qcom_glink_send_open_ack(struct qcom_glink *glink, 366 struct glink_channel *channel) 367 { 368 struct glink_msg msg; 369 370 msg.cmd = cpu_to_le16(RPM_CMD_OPEN_ACK); 371 msg.param1 = cpu_to_le16(channel->rcid); 372 msg.param2 = cpu_to_le32(0); 373 374 qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); 375 } 376 377 static void qcom_glink_handle_intent_req_ack(struct qcom_glink *glink, 378 unsigned int cid, bool granted) 379 { 380 struct glink_channel *channel; 381 unsigned long flags; 382 383 spin_lock_irqsave(&glink->idr_lock, flags); 384 channel = idr_find(&glink->rcids, cid); 385 spin_unlock_irqrestore(&glink->idr_lock, flags); 386 if (!channel) { 387 dev_err(glink->dev, "unable to find channel\n"); 388 return; 389 } 390 391 channel->intent_req_result = granted; 392 complete(&channel->intent_req_comp); 393 } 394 395 /** 396 * qcom_glink_send_open_req() - send a RPM_CMD_OPEN request to the remote 397 * @glink: Ptr to the glink edge 398 * @channel: Ptr to the channel that the open req is sent 399 * 400 * Allocates a local channel id and sends a RPM_CMD_OPEN message to the remote. 401 * Will return with refcount held, regardless of outcome. 402 * 403 * Returns 0 on success, negative errno otherwise. 404 */ 405 static int qcom_glink_send_open_req(struct qcom_glink *glink, 406 struct glink_channel *channel) 407 { 408 struct { 409 struct glink_msg msg; 410 u8 name[GLINK_NAME_SIZE]; 411 } __packed req; 412 int name_len = strlen(channel->name) + 1; 413 int req_len = ALIGN(sizeof(req.msg) + name_len, 8); 414 int ret; 415 unsigned long flags; 416 417 kref_get(&channel->refcount); 418 419 spin_lock_irqsave(&glink->idr_lock, flags); 420 ret = idr_alloc_cyclic(&glink->lcids, channel, 421 RPM_GLINK_CID_MIN, RPM_GLINK_CID_MAX, 422 GFP_ATOMIC); 423 spin_unlock_irqrestore(&glink->idr_lock, flags); 424 if (ret < 0) 425 return ret; 426 427 channel->lcid = ret; 428 429 req.msg.cmd = cpu_to_le16(RPM_CMD_OPEN); 430 req.msg.param1 = cpu_to_le16(channel->lcid); 431 req.msg.param2 = cpu_to_le32(name_len); 432 strcpy(req.name, channel->name); 433 434 ret = qcom_glink_tx(glink, &req, req_len, NULL, 0, true); 435 if (ret) 436 goto remove_idr; 437 438 return 0; 439 440 remove_idr: 441 spin_lock_irqsave(&glink->idr_lock, flags); 442 idr_remove(&glink->lcids, channel->lcid); 443 channel->lcid = 0; 444 spin_unlock_irqrestore(&glink->idr_lock, flags); 445 446 return ret; 447 } 448 449 static void qcom_glink_send_close_req(struct qcom_glink *glink, 450 struct glink_channel *channel) 451 { 452 struct glink_msg req; 453 454 req.cmd = cpu_to_le16(RPM_CMD_CLOSE); 455 req.param1 = cpu_to_le16(channel->lcid); 456 req.param2 = 0; 457 458 qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true); 459 } 460 461 static void qcom_glink_send_close_ack(struct qcom_glink *glink, 462 unsigned int rcid) 463 { 464 struct glink_msg req; 465 466 req.cmd = cpu_to_le16(RPM_CMD_CLOSE_ACK); 467 req.param1 = cpu_to_le16(rcid); 468 req.param2 = 0; 469 470 qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true); 471 } 472 473 static void qcom_glink_rx_done_work(struct work_struct *work) 474 { 475 struct glink_channel *channel = container_of(work, struct glink_channel, 476 intent_work); 477 struct qcom_glink *glink = channel->glink; 478 struct glink_core_rx_intent *intent, *tmp; 479 struct { 480 u16 id; 481 u16 lcid; 482 u32 liid; 483 } __packed cmd; 484 485 unsigned int cid = channel->lcid; 486 unsigned int iid; 487 bool reuse; 488 unsigned long flags; 489 490 spin_lock_irqsave(&channel->intent_lock, flags); 491 list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) { 492 list_del(&intent->node); 493 spin_unlock_irqrestore(&channel->intent_lock, flags); 494 iid = intent->id; 495 reuse = intent->reuse; 496 497 cmd.id = reuse ? RPM_CMD_RX_DONE_W_REUSE : RPM_CMD_RX_DONE; 498 cmd.lcid = cid; 499 cmd.liid = iid; 500 501 qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); 502 if (!reuse) { 503 kfree(intent->data); 504 kfree(intent); 505 } 506 spin_lock_irqsave(&channel->intent_lock, flags); 507 } 508 spin_unlock_irqrestore(&channel->intent_lock, flags); 509 } 510 511 static void qcom_glink_rx_done(struct qcom_glink *glink, 512 struct glink_channel *channel, 513 struct glink_core_rx_intent *intent) 514 { 515 /* We don't send RX_DONE to intentless systems */ 516 if (glink->intentless) { 517 kfree(intent->data); 518 kfree(intent); 519 return; 520 } 521 522 /* Take it off the tree of receive intents */ 523 if (!intent->reuse) { 524 spin_lock(&channel->intent_lock); 525 idr_remove(&channel->liids, intent->id); 526 spin_unlock(&channel->intent_lock); 527 } 528 529 /* Schedule the sending of a rx_done indication */ 530 spin_lock(&channel->intent_lock); 531 list_add_tail(&intent->node, &channel->done_intents); 532 spin_unlock(&channel->intent_lock); 533 534 schedule_work(&channel->intent_work); 535 } 536 537 /** 538 * qcom_glink_receive_version() - receive version/features from remote system 539 * 540 * @glink: pointer to transport interface 541 * @version: remote version 542 * @features: remote features 543 * 544 * This function is called in response to a remote-initiated version/feature 545 * negotiation sequence. 546 */ 547 static void qcom_glink_receive_version(struct qcom_glink *glink, 548 u32 version, 549 u32 features) 550 { 551 switch (version) { 552 case 0: 553 break; 554 case GLINK_VERSION_1: 555 glink->features &= features; 556 fallthrough; 557 default: 558 qcom_glink_send_version_ack(glink); 559 break; 560 } 561 } 562 563 /** 564 * qcom_glink_receive_version_ack() - receive negotiation ack from remote system 565 * 566 * @glink: pointer to transport interface 567 * @version: remote version response 568 * @features: remote features response 569 * 570 * This function is called in response to a local-initiated version/feature 571 * negotiation sequence and is the counter-offer from the remote side based 572 * upon the initial version and feature set requested. 573 */ 574 static void qcom_glink_receive_version_ack(struct qcom_glink *glink, 575 u32 version, 576 u32 features) 577 { 578 switch (version) { 579 case 0: 580 /* Version negotiation failed */ 581 break; 582 case GLINK_VERSION_1: 583 if (features == glink->features) 584 break; 585 586 glink->features &= features; 587 fallthrough; 588 default: 589 qcom_glink_send_version(glink); 590 break; 591 } 592 } 593 594 /** 595 * qcom_glink_send_intent_req_ack() - convert an rx intent request ack cmd to 596 * wire format and transmit 597 * @glink: The transport to transmit on. 598 * @channel: The glink channel 599 * @granted: The request response to encode. 600 * 601 * Return: 0 on success or standard Linux error code. 602 */ 603 static int qcom_glink_send_intent_req_ack(struct qcom_glink *glink, 604 struct glink_channel *channel, 605 bool granted) 606 { 607 struct glink_msg msg; 608 609 msg.cmd = cpu_to_le16(RPM_CMD_RX_INTENT_REQ_ACK); 610 msg.param1 = cpu_to_le16(channel->lcid); 611 msg.param2 = cpu_to_le32(granted); 612 613 qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); 614 615 return 0; 616 } 617 618 /** 619 * qcom_glink_advertise_intent - convert an rx intent cmd to wire format and 620 * transmit 621 * @glink: The transport to transmit on. 622 * @channel: The local channel 623 * @intent: The intent to pass on to remote. 624 * 625 * Return: 0 on success or standard Linux error code. 626 */ 627 static int qcom_glink_advertise_intent(struct qcom_glink *glink, 628 struct glink_channel *channel, 629 struct glink_core_rx_intent *intent) 630 { 631 struct command { 632 __le16 id; 633 __le16 lcid; 634 __le32 count; 635 __le32 size; 636 __le32 liid; 637 } __packed; 638 struct command cmd; 639 640 cmd.id = cpu_to_le16(RPM_CMD_INTENT); 641 cmd.lcid = cpu_to_le16(channel->lcid); 642 cmd.count = cpu_to_le32(1); 643 cmd.size = cpu_to_le32(intent->size); 644 cmd.liid = cpu_to_le32(intent->id); 645 646 qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); 647 648 return 0; 649 } 650 651 static struct glink_core_rx_intent * 652 qcom_glink_alloc_intent(struct qcom_glink *glink, 653 struct glink_channel *channel, 654 size_t size, 655 bool reuseable) 656 { 657 struct glink_core_rx_intent *intent; 658 int ret; 659 unsigned long flags; 660 661 intent = kzalloc(sizeof(*intent), GFP_KERNEL); 662 if (!intent) 663 return NULL; 664 665 intent->data = kzalloc(size, GFP_KERNEL); 666 if (!intent->data) 667 goto free_intent; 668 669 spin_lock_irqsave(&channel->intent_lock, flags); 670 ret = idr_alloc_cyclic(&channel->liids, intent, 1, -1, GFP_ATOMIC); 671 if (ret < 0) { 672 spin_unlock_irqrestore(&channel->intent_lock, flags); 673 goto free_data; 674 } 675 spin_unlock_irqrestore(&channel->intent_lock, flags); 676 677 intent->id = ret; 678 intent->size = size; 679 intent->reuse = reuseable; 680 681 return intent; 682 683 free_data: 684 kfree(intent->data); 685 free_intent: 686 kfree(intent); 687 return NULL; 688 } 689 690 static void qcom_glink_handle_rx_done(struct qcom_glink *glink, 691 u32 cid, uint32_t iid, 692 bool reuse) 693 { 694 struct glink_core_rx_intent *intent; 695 struct glink_channel *channel; 696 unsigned long flags; 697 698 spin_lock_irqsave(&glink->idr_lock, flags); 699 channel = idr_find(&glink->rcids, cid); 700 spin_unlock_irqrestore(&glink->idr_lock, flags); 701 if (!channel) { 702 dev_err(glink->dev, "invalid channel id received\n"); 703 return; 704 } 705 706 spin_lock_irqsave(&channel->intent_lock, flags); 707 intent = idr_find(&channel->riids, iid); 708 709 if (!intent) { 710 spin_unlock_irqrestore(&channel->intent_lock, flags); 711 dev_err(glink->dev, "invalid intent id received\n"); 712 return; 713 } 714 715 intent->in_use = false; 716 717 if (!reuse) { 718 idr_remove(&channel->riids, intent->id); 719 kfree(intent); 720 } 721 spin_unlock_irqrestore(&channel->intent_lock, flags); 722 } 723 724 /** 725 * qcom_glink_handle_intent_req() - Receive a request for rx_intent 726 * from remote side 727 * @glink: Pointer to the transport interface 728 * @cid: Remote channel ID 729 * @size: size of the intent 730 * 731 * The function searches for the local channel to which the request for 732 * rx_intent has arrived and allocates and notifies the remote back 733 */ 734 static void qcom_glink_handle_intent_req(struct qcom_glink *glink, 735 u32 cid, size_t size) 736 { 737 struct glink_core_rx_intent *intent; 738 struct glink_channel *channel; 739 unsigned long flags; 740 741 spin_lock_irqsave(&glink->idr_lock, flags); 742 channel = idr_find(&glink->rcids, cid); 743 spin_unlock_irqrestore(&glink->idr_lock, flags); 744 745 if (!channel) { 746 pr_err("%s channel not found for cid %d\n", __func__, cid); 747 return; 748 } 749 750 intent = qcom_glink_alloc_intent(glink, channel, size, false); 751 if (intent) 752 qcom_glink_advertise_intent(glink, channel, intent); 753 754 qcom_glink_send_intent_req_ack(glink, channel, !!intent); 755 } 756 757 static int qcom_glink_rx_defer(struct qcom_glink *glink, size_t extra) 758 { 759 struct glink_defer_cmd *dcmd; 760 761 extra = ALIGN(extra, 8); 762 763 if (qcom_glink_rx_avail(glink) < sizeof(struct glink_msg) + extra) { 764 dev_dbg(glink->dev, "Insufficient data in rx fifo"); 765 return -ENXIO; 766 } 767 768 dcmd = kzalloc(sizeof(*dcmd) + extra, GFP_ATOMIC); 769 if (!dcmd) 770 return -ENOMEM; 771 772 INIT_LIST_HEAD(&dcmd->node); 773 774 qcom_glink_rx_peak(glink, &dcmd->msg, 0, sizeof(dcmd->msg) + extra); 775 776 spin_lock(&glink->rx_lock); 777 list_add_tail(&dcmd->node, &glink->rx_queue); 778 spin_unlock(&glink->rx_lock); 779 780 schedule_work(&glink->rx_work); 781 qcom_glink_rx_advance(glink, sizeof(dcmd->msg) + extra); 782 783 return 0; 784 } 785 786 static int qcom_glink_rx_data(struct qcom_glink *glink, size_t avail) 787 { 788 struct glink_core_rx_intent *intent; 789 struct glink_channel *channel; 790 struct { 791 struct glink_msg msg; 792 __le32 chunk_size; 793 __le32 left_size; 794 } __packed hdr; 795 unsigned int chunk_size; 796 unsigned int left_size; 797 unsigned int rcid; 798 unsigned int liid; 799 int ret = 0; 800 unsigned long flags; 801 802 if (avail < sizeof(hdr)) { 803 dev_dbg(glink->dev, "Not enough data in fifo\n"); 804 return -EAGAIN; 805 } 806 807 qcom_glink_rx_peak(glink, &hdr, 0, sizeof(hdr)); 808 chunk_size = le32_to_cpu(hdr.chunk_size); 809 left_size = le32_to_cpu(hdr.left_size); 810 811 if (avail < sizeof(hdr) + chunk_size) { 812 dev_dbg(glink->dev, "Payload not yet in fifo\n"); 813 return -EAGAIN; 814 } 815 816 rcid = le16_to_cpu(hdr.msg.param1); 817 spin_lock_irqsave(&glink->idr_lock, flags); 818 channel = idr_find(&glink->rcids, rcid); 819 spin_unlock_irqrestore(&glink->idr_lock, flags); 820 if (!channel) { 821 dev_dbg(glink->dev, "Data on non-existing channel\n"); 822 823 /* Drop the message */ 824 goto advance_rx; 825 } 826 827 if (glink->intentless) { 828 /* Might have an ongoing, fragmented, message to append */ 829 if (!channel->buf) { 830 intent = kzalloc(sizeof(*intent), GFP_ATOMIC); 831 if (!intent) 832 return -ENOMEM; 833 834 intent->data = kmalloc(chunk_size + left_size, 835 GFP_ATOMIC); 836 if (!intent->data) { 837 kfree(intent); 838 return -ENOMEM; 839 } 840 841 intent->id = 0xbabababa; 842 intent->size = chunk_size + left_size; 843 intent->offset = 0; 844 845 channel->buf = intent; 846 } else { 847 intent = channel->buf; 848 } 849 } else { 850 liid = le32_to_cpu(hdr.msg.param2); 851 852 spin_lock_irqsave(&channel->intent_lock, flags); 853 intent = idr_find(&channel->liids, liid); 854 spin_unlock_irqrestore(&channel->intent_lock, flags); 855 856 if (!intent) { 857 dev_err(glink->dev, 858 "no intent found for channel %s intent %d", 859 channel->name, liid); 860 ret = -ENOENT; 861 goto advance_rx; 862 } 863 } 864 865 if (intent->size - intent->offset < chunk_size) { 866 dev_err(glink->dev, "Insufficient space in intent\n"); 867 868 /* The packet header lied, drop payload */ 869 goto advance_rx; 870 } 871 872 qcom_glink_rx_peak(glink, intent->data + intent->offset, 873 sizeof(hdr), chunk_size); 874 intent->offset += chunk_size; 875 876 /* Handle message when no fragments remain to be received */ 877 if (!left_size) { 878 spin_lock(&channel->recv_lock); 879 if (channel->ept.cb) { 880 channel->ept.cb(channel->ept.rpdev, 881 intent->data, 882 intent->offset, 883 channel->ept.priv, 884 RPMSG_ADDR_ANY); 885 } 886 spin_unlock(&channel->recv_lock); 887 888 intent->offset = 0; 889 channel->buf = NULL; 890 891 qcom_glink_rx_done(glink, channel, intent); 892 } 893 894 advance_rx: 895 qcom_glink_rx_advance(glink, ALIGN(sizeof(hdr) + chunk_size, 8)); 896 897 return ret; 898 } 899 900 static void qcom_glink_handle_intent(struct qcom_glink *glink, 901 unsigned int cid, 902 unsigned int count, 903 size_t avail) 904 { 905 struct glink_core_rx_intent *intent; 906 struct glink_channel *channel; 907 struct intent_pair { 908 __le32 size; 909 __le32 iid; 910 }; 911 912 struct { 913 struct glink_msg msg; 914 struct intent_pair intents[]; 915 } __packed * msg; 916 917 const size_t msglen = struct_size(msg, intents, count); 918 int ret; 919 int i; 920 unsigned long flags; 921 922 if (avail < msglen) { 923 dev_dbg(glink->dev, "Not enough data in fifo\n"); 924 return; 925 } 926 927 spin_lock_irqsave(&glink->idr_lock, flags); 928 channel = idr_find(&glink->rcids, cid); 929 spin_unlock_irqrestore(&glink->idr_lock, flags); 930 if (!channel) { 931 dev_err(glink->dev, "intents for non-existing channel\n"); 932 return; 933 } 934 935 msg = kmalloc(msglen, GFP_ATOMIC); 936 if (!msg) 937 return; 938 939 qcom_glink_rx_peak(glink, msg, 0, msglen); 940 941 for (i = 0; i < count; ++i) { 942 intent = kzalloc(sizeof(*intent), GFP_ATOMIC); 943 if (!intent) 944 break; 945 946 intent->id = le32_to_cpu(msg->intents[i].iid); 947 intent->size = le32_to_cpu(msg->intents[i].size); 948 949 spin_lock_irqsave(&channel->intent_lock, flags); 950 ret = idr_alloc(&channel->riids, intent, 951 intent->id, intent->id + 1, GFP_ATOMIC); 952 spin_unlock_irqrestore(&channel->intent_lock, flags); 953 954 if (ret < 0) 955 dev_err(glink->dev, "failed to store remote intent\n"); 956 } 957 958 kfree(msg); 959 qcom_glink_rx_advance(glink, ALIGN(msglen, 8)); 960 } 961 962 static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid) 963 { 964 struct glink_channel *channel; 965 966 spin_lock(&glink->idr_lock); 967 channel = idr_find(&glink->lcids, lcid); 968 spin_unlock(&glink->idr_lock); 969 if (!channel) { 970 dev_err(glink->dev, "Invalid open ack packet\n"); 971 return -EINVAL; 972 } 973 974 complete_all(&channel->open_ack); 975 976 return 0; 977 } 978 979 static irqreturn_t qcom_glink_native_intr(int irq, void *data) 980 { 981 struct qcom_glink *glink = data; 982 struct glink_msg msg; 983 unsigned int param1; 984 unsigned int param2; 985 unsigned int avail; 986 unsigned int cmd; 987 int ret = 0; 988 989 for (;;) { 990 avail = qcom_glink_rx_avail(glink); 991 if (avail < sizeof(msg)) 992 break; 993 994 qcom_glink_rx_peak(glink, &msg, 0, sizeof(msg)); 995 996 cmd = le16_to_cpu(msg.cmd); 997 param1 = le16_to_cpu(msg.param1); 998 param2 = le32_to_cpu(msg.param2); 999 1000 switch (cmd) { 1001 case RPM_CMD_VERSION: 1002 case RPM_CMD_VERSION_ACK: 1003 case RPM_CMD_CLOSE: 1004 case RPM_CMD_CLOSE_ACK: 1005 case RPM_CMD_RX_INTENT_REQ: 1006 ret = qcom_glink_rx_defer(glink, 0); 1007 break; 1008 case RPM_CMD_OPEN_ACK: 1009 ret = qcom_glink_rx_open_ack(glink, param1); 1010 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); 1011 break; 1012 case RPM_CMD_OPEN: 1013 ret = qcom_glink_rx_defer(glink, param2); 1014 break; 1015 case RPM_CMD_TX_DATA: 1016 case RPM_CMD_TX_DATA_CONT: 1017 ret = qcom_glink_rx_data(glink, avail); 1018 break; 1019 case RPM_CMD_READ_NOTIF: 1020 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); 1021 1022 mbox_send_message(glink->mbox_chan, NULL); 1023 mbox_client_txdone(glink->mbox_chan, 0); 1024 break; 1025 case RPM_CMD_INTENT: 1026 qcom_glink_handle_intent(glink, param1, param2, avail); 1027 break; 1028 case RPM_CMD_RX_DONE: 1029 qcom_glink_handle_rx_done(glink, param1, param2, false); 1030 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); 1031 break; 1032 case RPM_CMD_RX_DONE_W_REUSE: 1033 qcom_glink_handle_rx_done(glink, param1, param2, true); 1034 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); 1035 break; 1036 case RPM_CMD_RX_INTENT_REQ_ACK: 1037 qcom_glink_handle_intent_req_ack(glink, param1, param2); 1038 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); 1039 break; 1040 default: 1041 dev_err(glink->dev, "unhandled rx cmd: %d\n", cmd); 1042 ret = -EINVAL; 1043 break; 1044 } 1045 1046 if (ret) 1047 break; 1048 } 1049 1050 return IRQ_HANDLED; 1051 } 1052 1053 /* Locally initiated rpmsg_create_ept */ 1054 static struct glink_channel *qcom_glink_create_local(struct qcom_glink *glink, 1055 const char *name) 1056 { 1057 struct glink_channel *channel; 1058 int ret; 1059 unsigned long flags; 1060 1061 channel = qcom_glink_alloc_channel(glink, name); 1062 if (IS_ERR(channel)) 1063 return ERR_CAST(channel); 1064 1065 ret = qcom_glink_send_open_req(glink, channel); 1066 if (ret) 1067 goto release_channel; 1068 1069 ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ); 1070 if (!ret) 1071 goto err_timeout; 1072 1073 ret = wait_for_completion_timeout(&channel->open_req, 5 * HZ); 1074 if (!ret) 1075 goto err_timeout; 1076 1077 qcom_glink_send_open_ack(glink, channel); 1078 1079 return channel; 1080 1081 err_timeout: 1082 /* qcom_glink_send_open_req() did register the channel in lcids*/ 1083 spin_lock_irqsave(&glink->idr_lock, flags); 1084 idr_remove(&glink->lcids, channel->lcid); 1085 spin_unlock_irqrestore(&glink->idr_lock, flags); 1086 1087 release_channel: 1088 /* Release qcom_glink_send_open_req() reference */ 1089 kref_put(&channel->refcount, qcom_glink_channel_release); 1090 /* Release qcom_glink_alloc_channel() reference */ 1091 kref_put(&channel->refcount, qcom_glink_channel_release); 1092 1093 return ERR_PTR(-ETIMEDOUT); 1094 } 1095 1096 /* Remote initiated rpmsg_create_ept */ 1097 static int qcom_glink_create_remote(struct qcom_glink *glink, 1098 struct glink_channel *channel) 1099 { 1100 int ret; 1101 1102 qcom_glink_send_open_ack(glink, channel); 1103 1104 ret = qcom_glink_send_open_req(glink, channel); 1105 if (ret) 1106 goto close_link; 1107 1108 ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ); 1109 if (!ret) { 1110 ret = -ETIMEDOUT; 1111 goto close_link; 1112 } 1113 1114 return 0; 1115 1116 close_link: 1117 /* 1118 * Send a close request to "undo" our open-ack. The close-ack will 1119 * release qcom_glink_send_open_req() reference and the last reference 1120 * will be relesed after receiving remote_close or transport unregister 1121 * by calling qcom_glink_native_remove(). 1122 */ 1123 qcom_glink_send_close_req(glink, channel); 1124 1125 return ret; 1126 } 1127 1128 static struct rpmsg_endpoint *qcom_glink_create_ept(struct rpmsg_device *rpdev, 1129 rpmsg_rx_cb_t cb, 1130 void *priv, 1131 struct rpmsg_channel_info 1132 chinfo) 1133 { 1134 struct glink_channel *parent = to_glink_channel(rpdev->ept); 1135 struct glink_channel *channel; 1136 struct qcom_glink *glink = parent->glink; 1137 struct rpmsg_endpoint *ept; 1138 const char *name = chinfo.name; 1139 int cid; 1140 int ret; 1141 unsigned long flags; 1142 1143 spin_lock_irqsave(&glink->idr_lock, flags); 1144 idr_for_each_entry(&glink->rcids, channel, cid) { 1145 if (!strcmp(channel->name, name)) 1146 break; 1147 } 1148 spin_unlock_irqrestore(&glink->idr_lock, flags); 1149 1150 if (!channel) { 1151 channel = qcom_glink_create_local(glink, name); 1152 if (IS_ERR(channel)) 1153 return NULL; 1154 } else { 1155 ret = qcom_glink_create_remote(glink, channel); 1156 if (ret) 1157 return NULL; 1158 } 1159 1160 ept = &channel->ept; 1161 ept->rpdev = rpdev; 1162 ept->cb = cb; 1163 ept->priv = priv; 1164 ept->ops = &glink_endpoint_ops; 1165 1166 return ept; 1167 } 1168 1169 static int qcom_glink_announce_create(struct rpmsg_device *rpdev) 1170 { 1171 struct glink_channel *channel = to_glink_channel(rpdev->ept); 1172 struct device_node *np = rpdev->dev.of_node; 1173 struct qcom_glink *glink = channel->glink; 1174 struct glink_core_rx_intent *intent; 1175 const struct property *prop = NULL; 1176 __be32 defaults[] = { cpu_to_be32(SZ_1K), cpu_to_be32(5) }; 1177 int num_intents; 1178 int num_groups = 1; 1179 __be32 *val = defaults; 1180 int size; 1181 1182 if (glink->intentless || !completion_done(&channel->open_ack)) 1183 return 0; 1184 1185 prop = of_find_property(np, "qcom,intents", NULL); 1186 if (prop) { 1187 val = prop->value; 1188 num_groups = prop->length / sizeof(u32) / 2; 1189 } 1190 1191 /* Channel is now open, advertise base set of intents */ 1192 while (num_groups--) { 1193 size = be32_to_cpup(val++); 1194 num_intents = be32_to_cpup(val++); 1195 while (num_intents--) { 1196 intent = qcom_glink_alloc_intent(glink, channel, size, 1197 true); 1198 if (!intent) 1199 break; 1200 1201 qcom_glink_advertise_intent(glink, channel, intent); 1202 } 1203 } 1204 return 0; 1205 } 1206 1207 static void qcom_glink_destroy_ept(struct rpmsg_endpoint *ept) 1208 { 1209 struct glink_channel *channel = to_glink_channel(ept); 1210 struct qcom_glink *glink = channel->glink; 1211 unsigned long flags; 1212 1213 spin_lock_irqsave(&channel->recv_lock, flags); 1214 channel->ept.cb = NULL; 1215 spin_unlock_irqrestore(&channel->recv_lock, flags); 1216 1217 /* Decouple the potential rpdev from the channel */ 1218 channel->rpdev = NULL; 1219 1220 qcom_glink_send_close_req(glink, channel); 1221 } 1222 1223 static int qcom_glink_request_intent(struct qcom_glink *glink, 1224 struct glink_channel *channel, 1225 size_t size) 1226 { 1227 struct { 1228 u16 id; 1229 u16 cid; 1230 u32 size; 1231 } __packed cmd; 1232 1233 int ret; 1234 1235 mutex_lock(&channel->intent_req_lock); 1236 1237 reinit_completion(&channel->intent_req_comp); 1238 1239 cmd.id = RPM_CMD_RX_INTENT_REQ; 1240 cmd.cid = channel->lcid; 1241 cmd.size = size; 1242 1243 ret = qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); 1244 if (ret) 1245 goto unlock; 1246 1247 ret = wait_for_completion_timeout(&channel->intent_req_comp, 10 * HZ); 1248 if (!ret) { 1249 dev_err(glink->dev, "intent request timed out\n"); 1250 ret = -ETIMEDOUT; 1251 } else { 1252 ret = channel->intent_req_result ? 0 : -ECANCELED; 1253 } 1254 1255 unlock: 1256 mutex_unlock(&channel->intent_req_lock); 1257 return ret; 1258 } 1259 1260 static int __qcom_glink_send(struct glink_channel *channel, 1261 void *data, int len, bool wait) 1262 { 1263 struct qcom_glink *glink = channel->glink; 1264 struct glink_core_rx_intent *intent = NULL; 1265 struct glink_core_rx_intent *tmp; 1266 int iid = 0; 1267 struct { 1268 struct glink_msg msg; 1269 __le32 chunk_size; 1270 __le32 left_size; 1271 } __packed req; 1272 int ret; 1273 unsigned long flags; 1274 1275 if (!glink->intentless) { 1276 while (!intent) { 1277 spin_lock_irqsave(&channel->intent_lock, flags); 1278 idr_for_each_entry(&channel->riids, tmp, iid) { 1279 if (tmp->size >= len && !tmp->in_use) { 1280 if (!intent) 1281 intent = tmp; 1282 else if (intent->size > tmp->size) 1283 intent = tmp; 1284 if (intent->size == len) 1285 break; 1286 } 1287 } 1288 if (intent) 1289 intent->in_use = true; 1290 spin_unlock_irqrestore(&channel->intent_lock, flags); 1291 1292 /* We found an available intent */ 1293 if (intent) 1294 break; 1295 1296 if (!wait) 1297 return -EBUSY; 1298 1299 ret = qcom_glink_request_intent(glink, channel, len); 1300 if (ret < 0) 1301 return ret; 1302 } 1303 1304 iid = intent->id; 1305 } 1306 1307 req.msg.cmd = cpu_to_le16(RPM_CMD_TX_DATA); 1308 req.msg.param1 = cpu_to_le16(channel->lcid); 1309 req.msg.param2 = cpu_to_le32(iid); 1310 req.chunk_size = cpu_to_le32(len); 1311 req.left_size = cpu_to_le32(0); 1312 1313 ret = qcom_glink_tx(glink, &req, sizeof(req), data, len, wait); 1314 1315 /* Mark intent available if we failed */ 1316 if (ret && intent) 1317 intent->in_use = false; 1318 1319 return ret; 1320 } 1321 1322 static int qcom_glink_send(struct rpmsg_endpoint *ept, void *data, int len) 1323 { 1324 struct glink_channel *channel = to_glink_channel(ept); 1325 1326 return __qcom_glink_send(channel, data, len, true); 1327 } 1328 1329 static int qcom_glink_trysend(struct rpmsg_endpoint *ept, void *data, int len) 1330 { 1331 struct glink_channel *channel = to_glink_channel(ept); 1332 1333 return __qcom_glink_send(channel, data, len, false); 1334 } 1335 1336 static int qcom_glink_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst) 1337 { 1338 struct glink_channel *channel = to_glink_channel(ept); 1339 1340 return __qcom_glink_send(channel, data, len, true); 1341 } 1342 1343 static int qcom_glink_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst) 1344 { 1345 struct glink_channel *channel = to_glink_channel(ept); 1346 1347 return __qcom_glink_send(channel, data, len, false); 1348 } 1349 1350 /* 1351 * Finds the device_node for the glink child interested in this channel. 1352 */ 1353 static struct device_node *qcom_glink_match_channel(struct device_node *node, 1354 const char *channel) 1355 { 1356 struct device_node *child; 1357 const char *name; 1358 const char *key; 1359 int ret; 1360 1361 for_each_available_child_of_node(node, child) { 1362 key = "qcom,glink-channels"; 1363 ret = of_property_read_string(child, key, &name); 1364 if (ret) 1365 continue; 1366 1367 if (strcmp(name, channel) == 0) 1368 return child; 1369 } 1370 1371 return NULL; 1372 } 1373 1374 static const struct rpmsg_device_ops glink_device_ops = { 1375 .create_ept = qcom_glink_create_ept, 1376 .announce_create = qcom_glink_announce_create, 1377 }; 1378 1379 static const struct rpmsg_endpoint_ops glink_endpoint_ops = { 1380 .destroy_ept = qcom_glink_destroy_ept, 1381 .send = qcom_glink_send, 1382 .sendto = qcom_glink_sendto, 1383 .trysend = qcom_glink_trysend, 1384 .trysendto = qcom_glink_trysendto, 1385 }; 1386 1387 static void qcom_glink_rpdev_release(struct device *dev) 1388 { 1389 struct rpmsg_device *rpdev = to_rpmsg_device(dev); 1390 struct glink_channel *channel = to_glink_channel(rpdev->ept); 1391 1392 channel->rpdev = NULL; 1393 kfree(rpdev); 1394 } 1395 1396 static int qcom_glink_rx_open(struct qcom_glink *glink, unsigned int rcid, 1397 char *name) 1398 { 1399 struct glink_channel *channel; 1400 struct rpmsg_device *rpdev; 1401 bool create_device = false; 1402 struct device_node *node; 1403 int lcid; 1404 int ret; 1405 unsigned long flags; 1406 1407 spin_lock_irqsave(&glink->idr_lock, flags); 1408 idr_for_each_entry(&glink->lcids, channel, lcid) { 1409 if (!strcmp(channel->name, name)) 1410 break; 1411 } 1412 spin_unlock_irqrestore(&glink->idr_lock, flags); 1413 1414 if (!channel) { 1415 channel = qcom_glink_alloc_channel(glink, name); 1416 if (IS_ERR(channel)) 1417 return PTR_ERR(channel); 1418 1419 /* The opening dance was initiated by the remote */ 1420 create_device = true; 1421 } 1422 1423 spin_lock_irqsave(&glink->idr_lock, flags); 1424 ret = idr_alloc(&glink->rcids, channel, rcid, rcid + 1, GFP_ATOMIC); 1425 if (ret < 0) { 1426 dev_err(glink->dev, "Unable to insert channel into rcid list\n"); 1427 spin_unlock_irqrestore(&glink->idr_lock, flags); 1428 goto free_channel; 1429 } 1430 channel->rcid = ret; 1431 spin_unlock_irqrestore(&glink->idr_lock, flags); 1432 1433 complete_all(&channel->open_req); 1434 1435 if (create_device) { 1436 rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL); 1437 if (!rpdev) { 1438 ret = -ENOMEM; 1439 goto rcid_remove; 1440 } 1441 1442 rpdev->ept = &channel->ept; 1443 strncpy(rpdev->id.name, name, RPMSG_NAME_SIZE); 1444 rpdev->src = RPMSG_ADDR_ANY; 1445 rpdev->dst = RPMSG_ADDR_ANY; 1446 rpdev->ops = &glink_device_ops; 1447 1448 node = qcom_glink_match_channel(glink->dev->of_node, name); 1449 rpdev->dev.of_node = node; 1450 rpdev->dev.parent = glink->dev; 1451 rpdev->dev.release = qcom_glink_rpdev_release; 1452 1453 ret = rpmsg_register_device(rpdev); 1454 if (ret) 1455 goto rcid_remove; 1456 1457 channel->rpdev = rpdev; 1458 } 1459 1460 return 0; 1461 1462 rcid_remove: 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 free_channel: 1468 /* Release the reference, iff we took it */ 1469 if (create_device) 1470 kref_put(&channel->refcount, qcom_glink_channel_release); 1471 1472 return ret; 1473 } 1474 1475 static void qcom_glink_rx_close(struct qcom_glink *glink, unsigned int rcid) 1476 { 1477 struct rpmsg_channel_info chinfo; 1478 struct glink_channel *channel; 1479 unsigned long flags; 1480 1481 spin_lock_irqsave(&glink->idr_lock, flags); 1482 channel = idr_find(&glink->rcids, rcid); 1483 spin_unlock_irqrestore(&glink->idr_lock, flags); 1484 if (WARN(!channel, "close request on unknown channel\n")) 1485 return; 1486 1487 /* cancel pending rx_done work */ 1488 cancel_work_sync(&channel->intent_work); 1489 1490 if (channel->rpdev) { 1491 strncpy(chinfo.name, channel->name, sizeof(chinfo.name)); 1492 chinfo.src = RPMSG_ADDR_ANY; 1493 chinfo.dst = RPMSG_ADDR_ANY; 1494 1495 rpmsg_unregister_device(glink->dev, &chinfo); 1496 } 1497 1498 qcom_glink_send_close_ack(glink, channel->rcid); 1499 1500 spin_lock_irqsave(&glink->idr_lock, flags); 1501 idr_remove(&glink->rcids, channel->rcid); 1502 channel->rcid = 0; 1503 spin_unlock_irqrestore(&glink->idr_lock, flags); 1504 1505 kref_put(&channel->refcount, qcom_glink_channel_release); 1506 } 1507 1508 static void qcom_glink_rx_close_ack(struct qcom_glink *glink, unsigned int lcid) 1509 { 1510 struct glink_channel *channel; 1511 unsigned long flags; 1512 1513 spin_lock_irqsave(&glink->idr_lock, flags); 1514 channel = idr_find(&glink->lcids, lcid); 1515 if (WARN(!channel, "close ack on unknown channel\n")) { 1516 spin_unlock_irqrestore(&glink->idr_lock, flags); 1517 return; 1518 } 1519 1520 idr_remove(&glink->lcids, channel->lcid); 1521 channel->lcid = 0; 1522 spin_unlock_irqrestore(&glink->idr_lock, flags); 1523 1524 kref_put(&channel->refcount, qcom_glink_channel_release); 1525 } 1526 1527 static void qcom_glink_work(struct work_struct *work) 1528 { 1529 struct qcom_glink *glink = container_of(work, struct qcom_glink, 1530 rx_work); 1531 struct glink_defer_cmd *dcmd; 1532 struct glink_msg *msg; 1533 unsigned long flags; 1534 unsigned int param1; 1535 unsigned int param2; 1536 unsigned int cmd; 1537 1538 for (;;) { 1539 spin_lock_irqsave(&glink->rx_lock, flags); 1540 if (list_empty(&glink->rx_queue)) { 1541 spin_unlock_irqrestore(&glink->rx_lock, flags); 1542 break; 1543 } 1544 dcmd = list_first_entry(&glink->rx_queue, 1545 struct glink_defer_cmd, node); 1546 list_del(&dcmd->node); 1547 spin_unlock_irqrestore(&glink->rx_lock, flags); 1548 1549 msg = &dcmd->msg; 1550 cmd = le16_to_cpu(msg->cmd); 1551 param1 = le16_to_cpu(msg->param1); 1552 param2 = le32_to_cpu(msg->param2); 1553 1554 switch (cmd) { 1555 case RPM_CMD_VERSION: 1556 qcom_glink_receive_version(glink, param1, param2); 1557 break; 1558 case RPM_CMD_VERSION_ACK: 1559 qcom_glink_receive_version_ack(glink, param1, param2); 1560 break; 1561 case RPM_CMD_OPEN: 1562 qcom_glink_rx_open(glink, param1, msg->data); 1563 break; 1564 case RPM_CMD_CLOSE: 1565 qcom_glink_rx_close(glink, param1); 1566 break; 1567 case RPM_CMD_CLOSE_ACK: 1568 qcom_glink_rx_close_ack(glink, param1); 1569 break; 1570 case RPM_CMD_RX_INTENT_REQ: 1571 qcom_glink_handle_intent_req(glink, param1, param2); 1572 break; 1573 default: 1574 WARN(1, "Unknown defer object %d\n", cmd); 1575 break; 1576 } 1577 1578 kfree(dcmd); 1579 } 1580 } 1581 1582 static void qcom_glink_cancel_rx_work(struct qcom_glink *glink) 1583 { 1584 struct glink_defer_cmd *dcmd; 1585 struct glink_defer_cmd *tmp; 1586 1587 /* cancel any pending deferred rx_work */ 1588 cancel_work_sync(&glink->rx_work); 1589 1590 list_for_each_entry_safe(dcmd, tmp, &glink->rx_queue, node) 1591 kfree(dcmd); 1592 } 1593 1594 static ssize_t rpmsg_name_show(struct device *dev, 1595 struct device_attribute *attr, char *buf) 1596 { 1597 int ret = 0; 1598 const char *name; 1599 1600 ret = of_property_read_string(dev->of_node, "label", &name); 1601 if (ret < 0) 1602 name = dev->of_node->name; 1603 1604 return snprintf(buf, RPMSG_NAME_SIZE, "%s\n", name); 1605 } 1606 static DEVICE_ATTR_RO(rpmsg_name); 1607 1608 static struct attribute *qcom_glink_attrs[] = { 1609 &dev_attr_rpmsg_name.attr, 1610 NULL 1611 }; 1612 ATTRIBUTE_GROUPS(qcom_glink); 1613 1614 static void qcom_glink_device_release(struct device *dev) 1615 { 1616 struct rpmsg_device *rpdev = to_rpmsg_device(dev); 1617 struct glink_channel *channel = to_glink_channel(rpdev->ept); 1618 1619 /* Release qcom_glink_alloc_channel() reference */ 1620 kref_put(&channel->refcount, qcom_glink_channel_release); 1621 kfree(rpdev); 1622 } 1623 1624 static int qcom_glink_create_chrdev(struct qcom_glink *glink) 1625 { 1626 struct rpmsg_device *rpdev; 1627 struct glink_channel *channel; 1628 1629 rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL); 1630 if (!rpdev) 1631 return -ENOMEM; 1632 1633 channel = qcom_glink_alloc_channel(glink, "rpmsg_chrdev"); 1634 if (IS_ERR(channel)) { 1635 kfree(rpdev); 1636 return PTR_ERR(channel); 1637 } 1638 channel->rpdev = rpdev; 1639 1640 rpdev->ept = &channel->ept; 1641 rpdev->ops = &glink_device_ops; 1642 rpdev->dev.parent = glink->dev; 1643 rpdev->dev.release = qcom_glink_device_release; 1644 1645 return rpmsg_chrdev_register_device(rpdev); 1646 } 1647 1648 struct qcom_glink *qcom_glink_native_probe(struct device *dev, 1649 unsigned long features, 1650 struct qcom_glink_pipe *rx, 1651 struct qcom_glink_pipe *tx, 1652 bool intentless) 1653 { 1654 int irq; 1655 int ret; 1656 struct qcom_glink *glink; 1657 1658 glink = devm_kzalloc(dev, sizeof(*glink), GFP_KERNEL); 1659 if (!glink) 1660 return ERR_PTR(-ENOMEM); 1661 1662 glink->dev = dev; 1663 glink->tx_pipe = tx; 1664 glink->rx_pipe = rx; 1665 1666 glink->features = features; 1667 glink->intentless = intentless; 1668 1669 spin_lock_init(&glink->tx_lock); 1670 spin_lock_init(&glink->rx_lock); 1671 INIT_LIST_HEAD(&glink->rx_queue); 1672 INIT_WORK(&glink->rx_work, qcom_glink_work); 1673 1674 spin_lock_init(&glink->idr_lock); 1675 idr_init(&glink->lcids); 1676 idr_init(&glink->rcids); 1677 1678 glink->dev->groups = qcom_glink_groups; 1679 1680 ret = device_add_groups(dev, qcom_glink_groups); 1681 if (ret) 1682 dev_err(dev, "failed to add groups\n"); 1683 1684 ret = of_property_read_string(dev->of_node, "label", &glink->name); 1685 if (ret < 0) 1686 glink->name = dev->of_node->name; 1687 1688 glink->mbox_client.dev = dev; 1689 glink->mbox_client.knows_txdone = true; 1690 glink->mbox_chan = mbox_request_channel(&glink->mbox_client, 0); 1691 if (IS_ERR(glink->mbox_chan)) { 1692 if (PTR_ERR(glink->mbox_chan) != -EPROBE_DEFER) 1693 dev_err(dev, "failed to acquire IPC channel\n"); 1694 return ERR_CAST(glink->mbox_chan); 1695 } 1696 1697 irq = of_irq_get(dev->of_node, 0); 1698 ret = devm_request_irq(dev, irq, 1699 qcom_glink_native_intr, 1700 IRQF_NO_SUSPEND | IRQF_SHARED, 1701 "glink-native", glink); 1702 if (ret) { 1703 dev_err(dev, "failed to request IRQ\n"); 1704 return ERR_PTR(ret); 1705 } 1706 1707 glink->irq = irq; 1708 1709 ret = qcom_glink_send_version(glink); 1710 if (ret) 1711 return ERR_PTR(ret); 1712 1713 ret = qcom_glink_create_chrdev(glink); 1714 if (ret) 1715 dev_err(glink->dev, "failed to register chrdev\n"); 1716 1717 return glink; 1718 } 1719 EXPORT_SYMBOL_GPL(qcom_glink_native_probe); 1720 1721 static int qcom_glink_remove_device(struct device *dev, void *data) 1722 { 1723 device_unregister(dev); 1724 1725 return 0; 1726 } 1727 1728 void qcom_glink_native_remove(struct qcom_glink *glink) 1729 { 1730 struct glink_channel *channel; 1731 int cid; 1732 int ret; 1733 1734 disable_irq(glink->irq); 1735 qcom_glink_cancel_rx_work(glink); 1736 1737 ret = device_for_each_child(glink->dev, NULL, qcom_glink_remove_device); 1738 if (ret) 1739 dev_warn(glink->dev, "Can't remove GLINK devices: %d\n", ret); 1740 1741 /* Release any defunct local channels, waiting for close-ack */ 1742 idr_for_each_entry(&glink->lcids, channel, cid) 1743 kref_put(&channel->refcount, qcom_glink_channel_release); 1744 1745 /* Release any defunct local channels, waiting for close-req */ 1746 idr_for_each_entry(&glink->rcids, channel, cid) 1747 kref_put(&channel->refcount, qcom_glink_channel_release); 1748 1749 idr_destroy(&glink->lcids); 1750 idr_destroy(&glink->rcids); 1751 mbox_free_channel(glink->mbox_chan); 1752 } 1753 EXPORT_SYMBOL_GPL(qcom_glink_native_remove); 1754 1755 void qcom_glink_native_unregister(struct qcom_glink *glink) 1756 { 1757 device_unregister(glink->dev); 1758 } 1759 EXPORT_SYMBOL_GPL(qcom_glink_native_unregister); 1760 1761 MODULE_DESCRIPTION("Qualcomm GLINK driver"); 1762 MODULE_LICENSE("GPL v2"); 1763