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