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 mutex_init(&channel->intent_req_lock); 225 226 channel->glink = glink; 227 channel->name = kstrdup(name, GFP_KERNEL); 228 229 init_completion(&channel->open_req); 230 init_completion(&channel->open_ack); 231 init_completion(&channel->intent_req_comp); 232 233 INIT_LIST_HEAD(&channel->done_intents); 234 INIT_WORK(&channel->intent_work, qcom_glink_rx_done_work); 235 236 idr_init(&channel->liids); 237 idr_init(&channel->riids); 238 kref_init(&channel->refcount); 239 240 return channel; 241 } 242 243 static void qcom_glink_channel_release(struct kref *ref) 244 { 245 struct glink_channel *channel = container_of(ref, struct glink_channel, 246 refcount); 247 unsigned long flags; 248 249 spin_lock_irqsave(&channel->intent_lock, flags); 250 idr_destroy(&channel->liids); 251 idr_destroy(&channel->riids); 252 spin_unlock_irqrestore(&channel->intent_lock, flags); 253 254 kfree(channel->name); 255 kfree(channel); 256 } 257 258 static size_t qcom_glink_rx_avail(struct qcom_glink *glink) 259 { 260 return glink->rx_pipe->avail(glink->rx_pipe); 261 } 262 263 static void qcom_glink_rx_peak(struct qcom_glink *glink, 264 void *data, unsigned int offset, size_t count) 265 { 266 glink->rx_pipe->peak(glink->rx_pipe, data, offset, count); 267 } 268 269 static void qcom_glink_rx_advance(struct qcom_glink *glink, size_t count) 270 { 271 glink->rx_pipe->advance(glink->rx_pipe, count); 272 } 273 274 static size_t qcom_glink_tx_avail(struct qcom_glink *glink) 275 { 276 return glink->tx_pipe->avail(glink->tx_pipe); 277 } 278 279 static void qcom_glink_tx_write(struct qcom_glink *glink, 280 const void *hdr, size_t hlen, 281 const void *data, size_t dlen) 282 { 283 glink->tx_pipe->write(glink->tx_pipe, hdr, hlen, data, dlen); 284 } 285 286 static int qcom_glink_tx(struct qcom_glink *glink, 287 const void *hdr, size_t hlen, 288 const void *data, size_t dlen, bool wait) 289 { 290 unsigned int tlen = hlen + dlen; 291 int ret; 292 293 /* Reject packets that are too big */ 294 if (tlen >= glink->tx_pipe->length) 295 return -EINVAL; 296 297 ret = mutex_lock_interruptible(&glink->tx_lock); 298 if (ret) 299 return ret; 300 301 while (qcom_glink_tx_avail(glink) < tlen) { 302 if (!wait) { 303 ret = -EAGAIN; 304 goto out; 305 } 306 307 usleep_range(10000, 15000); 308 } 309 310 qcom_glink_tx_write(glink, hdr, hlen, data, dlen); 311 312 mbox_send_message(glink->mbox_chan, NULL); 313 mbox_client_txdone(glink->mbox_chan, 0); 314 315 out: 316 mutex_unlock(&glink->tx_lock); 317 318 return ret; 319 } 320 321 static int qcom_glink_send_version(struct qcom_glink *glink) 322 { 323 struct glink_msg msg; 324 325 msg.cmd = cpu_to_le16(RPM_CMD_VERSION); 326 msg.param1 = cpu_to_le16(GLINK_VERSION_1); 327 msg.param2 = cpu_to_le32(glink->features); 328 329 return qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); 330 } 331 332 static void qcom_glink_send_version_ack(struct qcom_glink *glink) 333 { 334 struct glink_msg msg; 335 336 msg.cmd = cpu_to_le16(RPM_CMD_VERSION_ACK); 337 msg.param1 = cpu_to_le16(GLINK_VERSION_1); 338 msg.param2 = cpu_to_le32(glink->features); 339 340 qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); 341 } 342 343 static void qcom_glink_send_open_ack(struct qcom_glink *glink, 344 struct glink_channel *channel) 345 { 346 struct glink_msg msg; 347 348 msg.cmd = cpu_to_le16(RPM_CMD_OPEN_ACK); 349 msg.param1 = cpu_to_le16(channel->rcid); 350 msg.param2 = cpu_to_le32(0); 351 352 qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); 353 } 354 355 static void qcom_glink_handle_intent_req_ack(struct qcom_glink *glink, 356 unsigned int cid, bool granted) 357 { 358 struct glink_channel *channel; 359 unsigned long flags; 360 361 spin_lock_irqsave(&glink->idr_lock, flags); 362 channel = idr_find(&glink->rcids, cid); 363 spin_unlock_irqrestore(&glink->idr_lock, flags); 364 if (!channel) { 365 dev_err(glink->dev, "unable to find channel\n"); 366 return; 367 } 368 369 channel->intent_req_result = granted; 370 complete(&channel->intent_req_comp); 371 } 372 373 /** 374 * qcom_glink_send_open_req() - send a RPM_CMD_OPEN request to the remote 375 * @glink: Ptr to the glink edge 376 * @channel: Ptr to the channel that the open req is sent 377 * 378 * Allocates a local channel id and sends a RPM_CMD_OPEN message to the remote. 379 * Will return with refcount held, regardless of outcome. 380 * 381 * Returns 0 on success, negative errno otherwise. 382 */ 383 static int qcom_glink_send_open_req(struct qcom_glink *glink, 384 struct glink_channel *channel) 385 { 386 struct { 387 struct glink_msg msg; 388 u8 name[GLINK_NAME_SIZE]; 389 } __packed req; 390 int name_len = strlen(channel->name) + 1; 391 int req_len = ALIGN(sizeof(req.msg) + name_len, 8); 392 int ret; 393 unsigned long flags; 394 395 kref_get(&channel->refcount); 396 397 spin_lock_irqsave(&glink->idr_lock, flags); 398 ret = idr_alloc_cyclic(&glink->lcids, channel, 399 RPM_GLINK_CID_MIN, RPM_GLINK_CID_MAX, 400 GFP_ATOMIC); 401 spin_unlock_irqrestore(&glink->idr_lock, flags); 402 if (ret < 0) 403 return ret; 404 405 channel->lcid = ret; 406 407 req.msg.cmd = cpu_to_le16(RPM_CMD_OPEN); 408 req.msg.param1 = cpu_to_le16(channel->lcid); 409 req.msg.param2 = cpu_to_le32(name_len); 410 strcpy(req.name, channel->name); 411 412 ret = qcom_glink_tx(glink, &req, req_len, NULL, 0, true); 413 if (ret) 414 goto remove_idr; 415 416 return 0; 417 418 remove_idr: 419 spin_lock_irqsave(&glink->idr_lock, flags); 420 idr_remove(&glink->lcids, channel->lcid); 421 channel->lcid = 0; 422 spin_unlock_irqrestore(&glink->idr_lock, flags); 423 424 return ret; 425 } 426 427 static void qcom_glink_send_close_req(struct qcom_glink *glink, 428 struct glink_channel *channel) 429 { 430 struct glink_msg req; 431 432 req.cmd = cpu_to_le16(RPM_CMD_CLOSE); 433 req.param1 = cpu_to_le16(channel->lcid); 434 req.param2 = 0; 435 436 qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true); 437 } 438 439 static void qcom_glink_send_close_ack(struct qcom_glink *glink, 440 unsigned int rcid) 441 { 442 struct glink_msg req; 443 444 req.cmd = cpu_to_le16(RPM_CMD_CLOSE_ACK); 445 req.param1 = cpu_to_le16(rcid); 446 req.param2 = 0; 447 448 qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true); 449 } 450 451 static void qcom_glink_rx_done_work(struct work_struct *work) 452 { 453 struct glink_channel *channel = container_of(work, struct glink_channel, 454 intent_work); 455 struct qcom_glink *glink = channel->glink; 456 struct glink_core_rx_intent *intent, *tmp; 457 struct { 458 u16 id; 459 u16 lcid; 460 u32 liid; 461 } __packed cmd; 462 463 unsigned int cid = channel->lcid; 464 unsigned int iid; 465 bool reuse; 466 unsigned long flags; 467 468 spin_lock_irqsave(&channel->intent_lock, flags); 469 list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) { 470 list_del(&intent->node); 471 spin_unlock_irqrestore(&channel->intent_lock, flags); 472 iid = intent->id; 473 reuse = intent->reuse; 474 475 cmd.id = reuse ? RPM_CMD_RX_DONE_W_REUSE : RPM_CMD_RX_DONE; 476 cmd.lcid = cid; 477 cmd.liid = iid; 478 479 qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); 480 if (!reuse) { 481 kfree(intent->data); 482 kfree(intent); 483 } 484 spin_lock_irqsave(&channel->intent_lock, flags); 485 } 486 spin_unlock_irqrestore(&channel->intent_lock, flags); 487 } 488 489 static void qcom_glink_rx_done(struct qcom_glink *glink, 490 struct glink_channel *channel, 491 struct glink_core_rx_intent *intent) 492 { 493 /* We don't send RX_DONE to intentless systems */ 494 if (glink->intentless) { 495 kfree(intent->data); 496 kfree(intent); 497 return; 498 } 499 500 /* Take it off the tree of receive intents */ 501 if (!intent->reuse) { 502 spin_lock(&channel->intent_lock); 503 idr_remove(&channel->liids, intent->id); 504 spin_unlock(&channel->intent_lock); 505 } 506 507 /* Schedule the sending of a rx_done indication */ 508 spin_lock(&channel->intent_lock); 509 list_add_tail(&intent->node, &channel->done_intents); 510 spin_unlock(&channel->intent_lock); 511 512 schedule_work(&channel->intent_work); 513 } 514 515 /** 516 * qcom_glink_receive_version() - receive version/features from remote system 517 * 518 * @glink: pointer to transport interface 519 * @r_version: remote version 520 * @r_features: remote features 521 * 522 * This function is called in response to a remote-initiated version/feature 523 * negotiation sequence. 524 */ 525 static void qcom_glink_receive_version(struct qcom_glink *glink, 526 u32 version, 527 u32 features) 528 { 529 switch (version) { 530 case 0: 531 break; 532 case GLINK_VERSION_1: 533 glink->features &= features; 534 /* FALLTHROUGH */ 535 default: 536 qcom_glink_send_version_ack(glink); 537 break; 538 } 539 } 540 541 /** 542 * qcom_glink_receive_version_ack() - receive negotiation ack from remote system 543 * 544 * @glink: pointer to transport interface 545 * @r_version: remote version response 546 * @r_features: remote features response 547 * 548 * This function is called in response to a local-initiated version/feature 549 * negotiation sequence and is the counter-offer from the remote side based 550 * upon the initial version and feature set requested. 551 */ 552 static void qcom_glink_receive_version_ack(struct qcom_glink *glink, 553 u32 version, 554 u32 features) 555 { 556 switch (version) { 557 case 0: 558 /* Version negotiation failed */ 559 break; 560 case GLINK_VERSION_1: 561 if (features == glink->features) 562 break; 563 564 glink->features &= features; 565 /* FALLTHROUGH */ 566 default: 567 qcom_glink_send_version(glink); 568 break; 569 } 570 } 571 572 /** 573 * qcom_glink_send_intent_req_ack() - convert an rx intent request ack cmd to 574 wire format and transmit 575 * @glink: The transport to transmit on. 576 * @channel: The glink channel 577 * @granted: The request response to encode. 578 * 579 * Return: 0 on success or standard Linux error code. 580 */ 581 static int qcom_glink_send_intent_req_ack(struct qcom_glink *glink, 582 struct glink_channel *channel, 583 bool granted) 584 { 585 struct glink_msg msg; 586 587 msg.cmd = cpu_to_le16(RPM_CMD_RX_INTENT_REQ_ACK); 588 msg.param1 = cpu_to_le16(channel->lcid); 589 msg.param2 = cpu_to_le32(granted); 590 591 qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); 592 593 return 0; 594 } 595 596 /** 597 * qcom_glink_advertise_intent - convert an rx intent cmd to wire format and 598 * transmit 599 * @glink: The transport to transmit on. 600 * @channel: The local channel 601 * @size: The intent to pass on to remote. 602 * 603 * Return: 0 on success or standard Linux error code. 604 */ 605 static int qcom_glink_advertise_intent(struct qcom_glink *glink, 606 struct glink_channel *channel, 607 struct glink_core_rx_intent *intent) 608 { 609 struct command { 610 u16 id; 611 u16 lcid; 612 u32 count; 613 u32 size; 614 u32 liid; 615 } __packed; 616 struct command cmd; 617 618 cmd.id = cpu_to_le16(RPM_CMD_INTENT); 619 cmd.lcid = cpu_to_le16(channel->lcid); 620 cmd.count = cpu_to_le32(1); 621 cmd.size = cpu_to_le32(intent->size); 622 cmd.liid = cpu_to_le32(intent->id); 623 624 qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); 625 626 return 0; 627 } 628 629 static struct glink_core_rx_intent * 630 qcom_glink_alloc_intent(struct qcom_glink *glink, 631 struct glink_channel *channel, 632 size_t size, 633 bool reuseable) 634 { 635 struct glink_core_rx_intent *intent; 636 int ret; 637 unsigned long flags; 638 639 intent = kzalloc(sizeof(*intent), GFP_KERNEL); 640 if (!intent) 641 return NULL; 642 643 intent->data = kzalloc(size, GFP_KERNEL); 644 if (!intent->data) 645 goto free_intent; 646 647 spin_lock_irqsave(&channel->intent_lock, flags); 648 ret = idr_alloc_cyclic(&channel->liids, intent, 1, -1, GFP_ATOMIC); 649 if (ret < 0) { 650 spin_unlock_irqrestore(&channel->intent_lock, flags); 651 goto free_data; 652 } 653 spin_unlock_irqrestore(&channel->intent_lock, flags); 654 655 intent->id = ret; 656 intent->size = size; 657 intent->reuse = reuseable; 658 659 return intent; 660 661 free_data: 662 kfree(intent->data); 663 free_intent: 664 kfree(intent); 665 return NULL; 666 } 667 668 static void qcom_glink_handle_rx_done(struct qcom_glink *glink, 669 u32 cid, uint32_t iid, 670 bool reuse) 671 { 672 struct glink_core_rx_intent *intent; 673 struct glink_channel *channel; 674 unsigned long flags; 675 676 spin_lock_irqsave(&glink->idr_lock, flags); 677 channel = idr_find(&glink->rcids, cid); 678 spin_unlock_irqrestore(&glink->idr_lock, flags); 679 if (!channel) { 680 dev_err(glink->dev, "invalid channel id received\n"); 681 return; 682 } 683 684 spin_lock_irqsave(&channel->intent_lock, flags); 685 intent = idr_find(&channel->riids, iid); 686 687 if (!intent) { 688 spin_unlock_irqrestore(&channel->intent_lock, flags); 689 dev_err(glink->dev, "invalid intent id received\n"); 690 return; 691 } 692 693 intent->in_use = false; 694 695 if (!reuse) { 696 idr_remove(&channel->riids, intent->id); 697 kfree(intent); 698 } 699 spin_unlock_irqrestore(&channel->intent_lock, flags); 700 } 701 702 /** 703 * qcom_glink_handle_intent_req() - Receive a request for rx_intent 704 * from remote side 705 * if_ptr: Pointer to the transport interface 706 * rcid: Remote channel ID 707 * size: size of the intent 708 * 709 * The function searches for the local channel to which the request for 710 * rx_intent has arrived and allocates and notifies the remote back 711 */ 712 static void qcom_glink_handle_intent_req(struct qcom_glink *glink, 713 u32 cid, size_t size) 714 { 715 struct glink_core_rx_intent *intent; 716 struct glink_channel *channel; 717 unsigned long flags; 718 719 spin_lock_irqsave(&glink->idr_lock, flags); 720 channel = idr_find(&glink->rcids, cid); 721 spin_unlock_irqrestore(&glink->idr_lock, flags); 722 723 if (!channel) { 724 pr_err("%s channel not found for cid %d\n", __func__, cid); 725 return; 726 } 727 728 intent = qcom_glink_alloc_intent(glink, channel, size, false); 729 if (intent) 730 qcom_glink_advertise_intent(glink, channel, intent); 731 732 qcom_glink_send_intent_req_ack(glink, channel, !!intent); 733 } 734 735 static int qcom_glink_rx_defer(struct qcom_glink *glink, size_t extra) 736 { 737 struct glink_defer_cmd *dcmd; 738 739 extra = ALIGN(extra, 8); 740 741 if (qcom_glink_rx_avail(glink) < sizeof(struct glink_msg) + extra) { 742 dev_dbg(glink->dev, "Insufficient data in rx fifo"); 743 return -ENXIO; 744 } 745 746 dcmd = kzalloc(sizeof(*dcmd) + extra, GFP_ATOMIC); 747 if (!dcmd) 748 return -ENOMEM; 749 750 INIT_LIST_HEAD(&dcmd->node); 751 752 qcom_glink_rx_peak(glink, &dcmd->msg, 0, sizeof(dcmd->msg) + extra); 753 754 spin_lock(&glink->rx_lock); 755 list_add_tail(&dcmd->node, &glink->rx_queue); 756 spin_unlock(&glink->rx_lock); 757 758 schedule_work(&glink->rx_work); 759 qcom_glink_rx_advance(glink, sizeof(dcmd->msg) + extra); 760 761 return 0; 762 } 763 764 static int qcom_glink_rx_data(struct qcom_glink *glink, size_t avail) 765 { 766 struct glink_core_rx_intent *intent; 767 struct glink_channel *channel; 768 struct { 769 struct glink_msg msg; 770 __le32 chunk_size; 771 __le32 left_size; 772 } __packed hdr; 773 unsigned int chunk_size; 774 unsigned int left_size; 775 unsigned int rcid; 776 unsigned int liid; 777 int ret = 0; 778 unsigned long flags; 779 780 if (avail < sizeof(hdr)) { 781 dev_dbg(glink->dev, "Not enough data in fifo\n"); 782 return -EAGAIN; 783 } 784 785 qcom_glink_rx_peak(glink, &hdr, 0, sizeof(hdr)); 786 chunk_size = le32_to_cpu(hdr.chunk_size); 787 left_size = le32_to_cpu(hdr.left_size); 788 789 if (avail < sizeof(hdr) + chunk_size) { 790 dev_dbg(glink->dev, "Payload not yet in fifo\n"); 791 return -EAGAIN; 792 } 793 794 if (WARN(chunk_size % 4, "Incoming data must be word aligned\n")) 795 return -EINVAL; 796 797 rcid = le16_to_cpu(hdr.msg.param1); 798 spin_lock_irqsave(&glink->idr_lock, flags); 799 channel = idr_find(&glink->rcids, rcid); 800 spin_unlock_irqrestore(&glink->idr_lock, flags); 801 if (!channel) { 802 dev_dbg(glink->dev, "Data on non-existing channel\n"); 803 804 /* Drop the message */ 805 goto advance_rx; 806 } 807 808 if (glink->intentless) { 809 /* Might have an ongoing, fragmented, message to append */ 810 if (!channel->buf) { 811 intent = kzalloc(sizeof(*intent), GFP_ATOMIC); 812 if (!intent) 813 return -ENOMEM; 814 815 intent->data = kmalloc(chunk_size + left_size, 816 GFP_ATOMIC); 817 if (!intent->data) { 818 kfree(intent); 819 return -ENOMEM; 820 } 821 822 intent->id = 0xbabababa; 823 intent->size = chunk_size + left_size; 824 intent->offset = 0; 825 826 channel->buf = intent; 827 } else { 828 intent = channel->buf; 829 } 830 } else { 831 liid = le32_to_cpu(hdr.msg.param2); 832 833 spin_lock_irqsave(&channel->intent_lock, flags); 834 intent = idr_find(&channel->liids, liid); 835 spin_unlock_irqrestore(&channel->intent_lock, flags); 836 837 if (!intent) { 838 dev_err(glink->dev, 839 "no intent found for channel %s intent %d", 840 channel->name, liid); 841 goto advance_rx; 842 } 843 } 844 845 if (intent->size - intent->offset < chunk_size) { 846 dev_err(glink->dev, "Insufficient space in intent\n"); 847 848 /* The packet header lied, drop payload */ 849 goto advance_rx; 850 } 851 852 qcom_glink_rx_peak(glink, intent->data + intent->offset, 853 sizeof(hdr), chunk_size); 854 intent->offset += chunk_size; 855 856 /* Handle message when no fragments remain to be received */ 857 if (!left_size) { 858 spin_lock(&channel->recv_lock); 859 if (channel->ept.cb) { 860 channel->ept.cb(channel->ept.rpdev, 861 intent->data, 862 intent->offset, 863 channel->ept.priv, 864 RPMSG_ADDR_ANY); 865 } 866 spin_unlock(&channel->recv_lock); 867 868 intent->offset = 0; 869 channel->buf = NULL; 870 871 qcom_glink_rx_done(glink, channel, intent); 872 } 873 874 advance_rx: 875 qcom_glink_rx_advance(glink, ALIGN(sizeof(hdr) + chunk_size, 8)); 876 877 return ret; 878 } 879 880 static void qcom_glink_handle_intent(struct qcom_glink *glink, 881 unsigned int cid, 882 unsigned int count, 883 size_t avail) 884 { 885 struct glink_core_rx_intent *intent; 886 struct glink_channel *channel; 887 struct intent_pair { 888 __le32 size; 889 __le32 iid; 890 }; 891 892 struct { 893 struct glink_msg msg; 894 struct intent_pair intents[]; 895 } __packed * msg; 896 897 const size_t msglen = sizeof(*msg) + sizeof(struct intent_pair) * count; 898 int ret; 899 int i; 900 unsigned long flags; 901 902 if (avail < msglen) { 903 dev_dbg(glink->dev, "Not enough data in fifo\n"); 904 return; 905 } 906 907 spin_lock_irqsave(&glink->idr_lock, flags); 908 channel = idr_find(&glink->rcids, cid); 909 spin_unlock_irqrestore(&glink->idr_lock, flags); 910 if (!channel) { 911 dev_err(glink->dev, "intents for non-existing channel\n"); 912 return; 913 } 914 915 msg = kmalloc(msglen, GFP_ATOMIC); 916 if (!msg) 917 return; 918 919 qcom_glink_rx_peak(glink, msg, 0, msglen); 920 921 for (i = 0; i < count; ++i) { 922 intent = kzalloc(sizeof(*intent), GFP_ATOMIC); 923 if (!intent) 924 break; 925 926 intent->id = le32_to_cpu(msg->intents[i].iid); 927 intent->size = le32_to_cpu(msg->intents[i].size); 928 929 spin_lock_irqsave(&channel->intent_lock, flags); 930 ret = idr_alloc(&channel->riids, intent, 931 intent->id, intent->id + 1, GFP_ATOMIC); 932 spin_unlock_irqrestore(&channel->intent_lock, flags); 933 934 if (ret < 0) 935 dev_err(glink->dev, "failed to store remote intent\n"); 936 } 937 938 kfree(msg); 939 qcom_glink_rx_advance(glink, ALIGN(msglen, 8)); 940 } 941 942 static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid) 943 { 944 struct glink_channel *channel; 945 946 spin_lock(&glink->idr_lock); 947 channel = idr_find(&glink->lcids, lcid); 948 spin_unlock(&glink->idr_lock); 949 if (!channel) { 950 dev_err(glink->dev, "Invalid open ack packet\n"); 951 return -EINVAL; 952 } 953 954 complete(&channel->open_ack); 955 956 return 0; 957 } 958 959 static irqreturn_t qcom_glink_native_intr(int irq, void *data) 960 { 961 struct qcom_glink *glink = data; 962 struct glink_msg msg; 963 unsigned int param1; 964 unsigned int param2; 965 unsigned int avail; 966 unsigned int cmd; 967 int ret = 0; 968 969 for (;;) { 970 avail = qcom_glink_rx_avail(glink); 971 if (avail < sizeof(msg)) 972 break; 973 974 qcom_glink_rx_peak(glink, &msg, 0, sizeof(msg)); 975 976 cmd = le16_to_cpu(msg.cmd); 977 param1 = le16_to_cpu(msg.param1); 978 param2 = le32_to_cpu(msg.param2); 979 980 switch (cmd) { 981 case RPM_CMD_VERSION: 982 case RPM_CMD_VERSION_ACK: 983 case RPM_CMD_CLOSE: 984 case RPM_CMD_CLOSE_ACK: 985 case RPM_CMD_RX_INTENT_REQ: 986 ret = qcom_glink_rx_defer(glink, 0); 987 break; 988 case RPM_CMD_OPEN_ACK: 989 ret = qcom_glink_rx_open_ack(glink, param1); 990 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); 991 break; 992 case RPM_CMD_OPEN: 993 ret = qcom_glink_rx_defer(glink, param2); 994 break; 995 case RPM_CMD_TX_DATA: 996 case RPM_CMD_TX_DATA_CONT: 997 ret = qcom_glink_rx_data(glink, avail); 998 break; 999 case RPM_CMD_READ_NOTIF: 1000 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); 1001 1002 mbox_send_message(glink->mbox_chan, NULL); 1003 mbox_client_txdone(glink->mbox_chan, 0); 1004 break; 1005 case RPM_CMD_INTENT: 1006 qcom_glink_handle_intent(glink, param1, param2, avail); 1007 break; 1008 case RPM_CMD_RX_DONE: 1009 qcom_glink_handle_rx_done(glink, param1, param2, false); 1010 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); 1011 break; 1012 case RPM_CMD_RX_DONE_W_REUSE: 1013 qcom_glink_handle_rx_done(glink, param1, param2, true); 1014 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); 1015 break; 1016 case RPM_CMD_RX_INTENT_REQ_ACK: 1017 qcom_glink_handle_intent_req_ack(glink, param1, param2); 1018 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); 1019 break; 1020 default: 1021 dev_err(glink->dev, "unhandled rx cmd: %d\n", cmd); 1022 ret = -EINVAL; 1023 break; 1024 } 1025 1026 if (ret) 1027 break; 1028 } 1029 1030 return IRQ_HANDLED; 1031 } 1032 1033 /* Locally initiated rpmsg_create_ept */ 1034 static struct glink_channel *qcom_glink_create_local(struct qcom_glink *glink, 1035 const char *name) 1036 { 1037 struct glink_channel *channel; 1038 int ret; 1039 unsigned long flags; 1040 1041 channel = qcom_glink_alloc_channel(glink, name); 1042 if (IS_ERR(channel)) 1043 return ERR_CAST(channel); 1044 1045 ret = qcom_glink_send_open_req(glink, channel); 1046 if (ret) 1047 goto release_channel; 1048 1049 ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ); 1050 if (!ret) 1051 goto err_timeout; 1052 1053 ret = wait_for_completion_timeout(&channel->open_req, 5 * HZ); 1054 if (!ret) 1055 goto err_timeout; 1056 1057 qcom_glink_send_open_ack(glink, channel); 1058 1059 return channel; 1060 1061 err_timeout: 1062 /* qcom_glink_send_open_req() did register the channel in lcids*/ 1063 spin_lock_irqsave(&glink->idr_lock, flags); 1064 idr_remove(&glink->lcids, channel->lcid); 1065 spin_unlock_irqrestore(&glink->idr_lock, flags); 1066 1067 release_channel: 1068 /* Release qcom_glink_send_open_req() reference */ 1069 kref_put(&channel->refcount, qcom_glink_channel_release); 1070 /* Release qcom_glink_alloc_channel() reference */ 1071 kref_put(&channel->refcount, qcom_glink_channel_release); 1072 1073 return ERR_PTR(-ETIMEDOUT); 1074 } 1075 1076 /* Remote initiated rpmsg_create_ept */ 1077 static int qcom_glink_create_remote(struct qcom_glink *glink, 1078 struct glink_channel *channel) 1079 { 1080 int ret; 1081 1082 qcom_glink_send_open_ack(glink, channel); 1083 1084 ret = qcom_glink_send_open_req(glink, channel); 1085 if (ret) 1086 goto close_link; 1087 1088 ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ); 1089 if (!ret) { 1090 ret = -ETIMEDOUT; 1091 goto close_link; 1092 } 1093 1094 return 0; 1095 1096 close_link: 1097 /* 1098 * Send a close request to "undo" our open-ack. The close-ack will 1099 * release the last reference. 1100 */ 1101 qcom_glink_send_close_req(glink, channel); 1102 1103 /* Release qcom_glink_send_open_req() reference */ 1104 kref_put(&channel->refcount, qcom_glink_channel_release); 1105 1106 return ret; 1107 } 1108 1109 static struct rpmsg_endpoint *qcom_glink_create_ept(struct rpmsg_device *rpdev, 1110 rpmsg_rx_cb_t cb, 1111 void *priv, 1112 struct rpmsg_channel_info 1113 chinfo) 1114 { 1115 struct glink_channel *parent = to_glink_channel(rpdev->ept); 1116 struct glink_channel *channel; 1117 struct qcom_glink *glink = parent->glink; 1118 struct rpmsg_endpoint *ept; 1119 const char *name = chinfo.name; 1120 int cid; 1121 int ret; 1122 unsigned long flags; 1123 1124 spin_lock_irqsave(&glink->idr_lock, flags); 1125 idr_for_each_entry(&glink->rcids, channel, cid) { 1126 if (!strcmp(channel->name, name)) 1127 break; 1128 } 1129 spin_unlock_irqrestore(&glink->idr_lock, flags); 1130 1131 if (!channel) { 1132 channel = qcom_glink_create_local(glink, name); 1133 if (IS_ERR(channel)) 1134 return NULL; 1135 } else { 1136 ret = qcom_glink_create_remote(glink, channel); 1137 if (ret) 1138 return NULL; 1139 } 1140 1141 ept = &channel->ept; 1142 ept->rpdev = rpdev; 1143 ept->cb = cb; 1144 ept->priv = priv; 1145 ept->ops = &glink_endpoint_ops; 1146 1147 return ept; 1148 } 1149 1150 static int qcom_glink_announce_create(struct rpmsg_device *rpdev) 1151 { 1152 struct glink_channel *channel = to_glink_channel(rpdev->ept); 1153 struct device_node *np = rpdev->dev.of_node; 1154 struct qcom_glink *glink = channel->glink; 1155 struct glink_core_rx_intent *intent; 1156 const struct property *prop = NULL; 1157 __be32 defaults[] = { cpu_to_be32(SZ_1K), cpu_to_be32(5) }; 1158 int num_intents; 1159 int num_groups = 1; 1160 __be32 *val = defaults; 1161 int size; 1162 1163 if (glink->intentless) 1164 return 0; 1165 1166 prop = of_find_property(np, "qcom,intents", NULL); 1167 if (prop) { 1168 val = prop->value; 1169 num_groups = prop->length / sizeof(u32) / 2; 1170 } 1171 1172 /* Channel is now open, advertise base set of intents */ 1173 while (num_groups--) { 1174 size = be32_to_cpup(val++); 1175 num_intents = be32_to_cpup(val++); 1176 while (num_intents--) { 1177 intent = qcom_glink_alloc_intent(glink, channel, size, 1178 true); 1179 if (!intent) 1180 break; 1181 1182 qcom_glink_advertise_intent(glink, channel, intent); 1183 } 1184 } 1185 return 0; 1186 } 1187 1188 static void qcom_glink_destroy_ept(struct rpmsg_endpoint *ept) 1189 { 1190 struct glink_channel *channel = to_glink_channel(ept); 1191 struct qcom_glink *glink = channel->glink; 1192 unsigned long flags; 1193 1194 spin_lock_irqsave(&channel->recv_lock, flags); 1195 channel->ept.cb = NULL; 1196 spin_unlock_irqrestore(&channel->recv_lock, flags); 1197 1198 /* Decouple the potential rpdev from the channel */ 1199 channel->rpdev = NULL; 1200 1201 qcom_glink_send_close_req(glink, channel); 1202 } 1203 1204 static int qcom_glink_request_intent(struct qcom_glink *glink, 1205 struct glink_channel *channel, 1206 size_t size) 1207 { 1208 struct { 1209 u16 id; 1210 u16 cid; 1211 u32 size; 1212 } __packed cmd; 1213 1214 int ret; 1215 1216 mutex_lock(&channel->intent_req_lock); 1217 1218 reinit_completion(&channel->intent_req_comp); 1219 1220 cmd.id = RPM_CMD_RX_INTENT_REQ; 1221 cmd.cid = channel->lcid; 1222 cmd.size = size; 1223 1224 ret = qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); 1225 if (ret) 1226 goto unlock; 1227 1228 ret = wait_for_completion_timeout(&channel->intent_req_comp, 10 * HZ); 1229 if (!ret) { 1230 dev_err(glink->dev, "intent request timed out\n"); 1231 ret = -ETIMEDOUT; 1232 } else { 1233 ret = channel->intent_req_result ? 0 : -ECANCELED; 1234 } 1235 1236 unlock: 1237 mutex_unlock(&channel->intent_req_lock); 1238 return ret; 1239 } 1240 1241 static int __qcom_glink_send(struct glink_channel *channel, 1242 void *data, int len, bool wait) 1243 { 1244 struct qcom_glink *glink = channel->glink; 1245 struct glink_core_rx_intent *intent = NULL; 1246 struct glink_core_rx_intent *tmp; 1247 int iid = 0; 1248 struct { 1249 struct glink_msg msg; 1250 __le32 chunk_size; 1251 __le32 left_size; 1252 } __packed req; 1253 int ret; 1254 unsigned long flags; 1255 1256 if (!glink->intentless) { 1257 while (!intent) { 1258 spin_lock_irqsave(&channel->intent_lock, flags); 1259 idr_for_each_entry(&channel->riids, tmp, iid) { 1260 if (tmp->size >= len && !tmp->in_use) { 1261 if (!intent) 1262 intent = tmp; 1263 else if (intent->size > tmp->size) 1264 intent = tmp; 1265 if (intent->size == len) 1266 break; 1267 } 1268 } 1269 if (intent) 1270 intent->in_use = true; 1271 spin_unlock_irqrestore(&channel->intent_lock, flags); 1272 1273 /* We found an available intent */ 1274 if (intent) 1275 break; 1276 1277 if (!wait) 1278 return -EBUSY; 1279 1280 ret = qcom_glink_request_intent(glink, channel, len); 1281 if (ret < 0) 1282 return ret; 1283 } 1284 1285 iid = intent->id; 1286 } 1287 1288 req.msg.cmd = cpu_to_le16(RPM_CMD_TX_DATA); 1289 req.msg.param1 = cpu_to_le16(channel->lcid); 1290 req.msg.param2 = cpu_to_le32(iid); 1291 req.chunk_size = cpu_to_le32(len); 1292 req.left_size = cpu_to_le32(0); 1293 1294 ret = qcom_glink_tx(glink, &req, sizeof(req), data, len, wait); 1295 1296 /* Mark intent available if we failed */ 1297 if (ret && intent) 1298 intent->in_use = false; 1299 1300 return ret; 1301 } 1302 1303 static int qcom_glink_send(struct rpmsg_endpoint *ept, void *data, int len) 1304 { 1305 struct glink_channel *channel = to_glink_channel(ept); 1306 1307 return __qcom_glink_send(channel, data, len, true); 1308 } 1309 1310 static int qcom_glink_trysend(struct rpmsg_endpoint *ept, void *data, int len) 1311 { 1312 struct glink_channel *channel = to_glink_channel(ept); 1313 1314 return __qcom_glink_send(channel, data, len, false); 1315 } 1316 1317 /* 1318 * Finds the device_node for the glink child interested in this channel. 1319 */ 1320 static struct device_node *qcom_glink_match_channel(struct device_node *node, 1321 const char *channel) 1322 { 1323 struct device_node *child; 1324 const char *name; 1325 const char *key; 1326 int ret; 1327 1328 for_each_available_child_of_node(node, child) { 1329 key = "qcom,glink-channels"; 1330 ret = of_property_read_string(child, key, &name); 1331 if (ret) 1332 continue; 1333 1334 if (strcmp(name, channel) == 0) 1335 return child; 1336 } 1337 1338 return NULL; 1339 } 1340 1341 static const struct rpmsg_device_ops glink_device_ops = { 1342 .create_ept = qcom_glink_create_ept, 1343 .announce_create = qcom_glink_announce_create, 1344 }; 1345 1346 static const struct rpmsg_endpoint_ops glink_endpoint_ops = { 1347 .destroy_ept = qcom_glink_destroy_ept, 1348 .send = qcom_glink_send, 1349 .trysend = qcom_glink_trysend, 1350 }; 1351 1352 static void qcom_glink_rpdev_release(struct device *dev) 1353 { 1354 struct rpmsg_device *rpdev = to_rpmsg_device(dev); 1355 struct glink_channel *channel = to_glink_channel(rpdev->ept); 1356 1357 channel->rpdev = NULL; 1358 kfree(rpdev); 1359 } 1360 1361 static int qcom_glink_rx_open(struct qcom_glink *glink, unsigned int rcid, 1362 char *name) 1363 { 1364 struct glink_channel *channel; 1365 struct rpmsg_device *rpdev; 1366 bool create_device = false; 1367 struct device_node *node; 1368 int lcid; 1369 int ret; 1370 unsigned long flags; 1371 1372 spin_lock_irqsave(&glink->idr_lock, flags); 1373 idr_for_each_entry(&glink->lcids, channel, lcid) { 1374 if (!strcmp(channel->name, name)) 1375 break; 1376 } 1377 spin_unlock_irqrestore(&glink->idr_lock, flags); 1378 1379 if (!channel) { 1380 channel = qcom_glink_alloc_channel(glink, name); 1381 if (IS_ERR(channel)) 1382 return PTR_ERR(channel); 1383 1384 /* The opening dance was initiated by the remote */ 1385 create_device = true; 1386 } 1387 1388 spin_lock_irqsave(&glink->idr_lock, flags); 1389 ret = idr_alloc(&glink->rcids, channel, rcid, rcid + 1, GFP_ATOMIC); 1390 if (ret < 0) { 1391 dev_err(glink->dev, "Unable to insert channel into rcid list\n"); 1392 spin_unlock_irqrestore(&glink->idr_lock, flags); 1393 goto free_channel; 1394 } 1395 channel->rcid = ret; 1396 spin_unlock_irqrestore(&glink->idr_lock, flags); 1397 1398 complete(&channel->open_req); 1399 1400 if (create_device) { 1401 rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL); 1402 if (!rpdev) { 1403 ret = -ENOMEM; 1404 goto rcid_remove; 1405 } 1406 1407 rpdev->ept = &channel->ept; 1408 strncpy(rpdev->id.name, name, RPMSG_NAME_SIZE); 1409 rpdev->src = RPMSG_ADDR_ANY; 1410 rpdev->dst = RPMSG_ADDR_ANY; 1411 rpdev->ops = &glink_device_ops; 1412 1413 node = qcom_glink_match_channel(glink->dev->of_node, name); 1414 rpdev->dev.of_node = node; 1415 rpdev->dev.parent = glink->dev; 1416 rpdev->dev.release = qcom_glink_rpdev_release; 1417 1418 ret = rpmsg_register_device(rpdev); 1419 if (ret) 1420 goto free_rpdev; 1421 1422 channel->rpdev = rpdev; 1423 } 1424 1425 return 0; 1426 1427 free_rpdev: 1428 kfree(rpdev); 1429 rcid_remove: 1430 spin_lock_irqsave(&glink->idr_lock, flags); 1431 idr_remove(&glink->rcids, channel->rcid); 1432 channel->rcid = 0; 1433 spin_unlock_irqrestore(&glink->idr_lock, flags); 1434 free_channel: 1435 /* Release the reference, iff we took it */ 1436 if (create_device) 1437 kref_put(&channel->refcount, qcom_glink_channel_release); 1438 1439 return ret; 1440 } 1441 1442 static void qcom_glink_rx_close(struct qcom_glink *glink, unsigned int rcid) 1443 { 1444 struct rpmsg_channel_info chinfo; 1445 struct glink_channel *channel; 1446 unsigned long flags; 1447 1448 spin_lock_irqsave(&glink->idr_lock, flags); 1449 channel = idr_find(&glink->rcids, rcid); 1450 spin_unlock_irqrestore(&glink->idr_lock, flags); 1451 if (WARN(!channel, "close request on unknown channel\n")) 1452 return; 1453 1454 /* cancel pending rx_done work */ 1455 cancel_work_sync(&channel->intent_work); 1456 1457 if (channel->rpdev) { 1458 strncpy(chinfo.name, channel->name, sizeof(chinfo.name)); 1459 chinfo.src = RPMSG_ADDR_ANY; 1460 chinfo.dst = RPMSG_ADDR_ANY; 1461 1462 rpmsg_unregister_device(glink->dev, &chinfo); 1463 } 1464 1465 qcom_glink_send_close_ack(glink, channel->rcid); 1466 1467 spin_lock_irqsave(&glink->idr_lock, flags); 1468 idr_remove(&glink->rcids, channel->rcid); 1469 channel->rcid = 0; 1470 spin_unlock_irqrestore(&glink->idr_lock, flags); 1471 1472 kref_put(&channel->refcount, qcom_glink_channel_release); 1473 } 1474 1475 static void qcom_glink_rx_close_ack(struct qcom_glink *glink, unsigned int lcid) 1476 { 1477 struct glink_channel *channel; 1478 unsigned long flags; 1479 1480 spin_lock_irqsave(&glink->idr_lock, flags); 1481 channel = idr_find(&glink->lcids, lcid); 1482 if (WARN(!channel, "close ack on unknown channel\n")) { 1483 spin_unlock_irqrestore(&glink->idr_lock, flags); 1484 return; 1485 } 1486 1487 idr_remove(&glink->lcids, channel->lcid); 1488 channel->lcid = 0; 1489 spin_unlock_irqrestore(&glink->idr_lock, flags); 1490 1491 kref_put(&channel->refcount, qcom_glink_channel_release); 1492 } 1493 1494 static void qcom_glink_work(struct work_struct *work) 1495 { 1496 struct qcom_glink *glink = container_of(work, struct qcom_glink, 1497 rx_work); 1498 struct glink_defer_cmd *dcmd; 1499 struct glink_msg *msg; 1500 unsigned long flags; 1501 unsigned int param1; 1502 unsigned int param2; 1503 unsigned int cmd; 1504 1505 for (;;) { 1506 spin_lock_irqsave(&glink->rx_lock, flags); 1507 if (list_empty(&glink->rx_queue)) { 1508 spin_unlock_irqrestore(&glink->rx_lock, flags); 1509 break; 1510 } 1511 dcmd = list_first_entry(&glink->rx_queue, 1512 struct glink_defer_cmd, node); 1513 list_del(&dcmd->node); 1514 spin_unlock_irqrestore(&glink->rx_lock, flags); 1515 1516 msg = &dcmd->msg; 1517 cmd = le16_to_cpu(msg->cmd); 1518 param1 = le16_to_cpu(msg->param1); 1519 param2 = le32_to_cpu(msg->param2); 1520 1521 switch (cmd) { 1522 case RPM_CMD_VERSION: 1523 qcom_glink_receive_version(glink, param1, param2); 1524 break; 1525 case RPM_CMD_VERSION_ACK: 1526 qcom_glink_receive_version_ack(glink, param1, param2); 1527 break; 1528 case RPM_CMD_OPEN: 1529 qcom_glink_rx_open(glink, param1, msg->data); 1530 break; 1531 case RPM_CMD_CLOSE: 1532 qcom_glink_rx_close(glink, param1); 1533 break; 1534 case RPM_CMD_CLOSE_ACK: 1535 qcom_glink_rx_close_ack(glink, param1); 1536 break; 1537 case RPM_CMD_RX_INTENT_REQ: 1538 qcom_glink_handle_intent_req(glink, param1, param2); 1539 break; 1540 default: 1541 WARN(1, "Unknown defer object %d\n", cmd); 1542 break; 1543 } 1544 1545 kfree(dcmd); 1546 } 1547 } 1548 1549 struct qcom_glink *qcom_glink_native_probe(struct device *dev, 1550 unsigned long features, 1551 struct qcom_glink_pipe *rx, 1552 struct qcom_glink_pipe *tx, 1553 bool intentless) 1554 { 1555 int irq; 1556 int ret; 1557 struct qcom_glink *glink; 1558 1559 glink = devm_kzalloc(dev, sizeof(*glink), GFP_KERNEL); 1560 if (!glink) 1561 return ERR_PTR(-ENOMEM); 1562 1563 glink->dev = dev; 1564 glink->tx_pipe = tx; 1565 glink->rx_pipe = rx; 1566 1567 glink->features = features; 1568 glink->intentless = intentless; 1569 1570 mutex_init(&glink->tx_lock); 1571 spin_lock_init(&glink->rx_lock); 1572 INIT_LIST_HEAD(&glink->rx_queue); 1573 INIT_WORK(&glink->rx_work, qcom_glink_work); 1574 1575 spin_lock_init(&glink->idr_lock); 1576 idr_init(&glink->lcids); 1577 idr_init(&glink->rcids); 1578 1579 glink->mbox_client.dev = dev; 1580 glink->mbox_client.knows_txdone = true; 1581 glink->mbox_chan = mbox_request_channel(&glink->mbox_client, 0); 1582 if (IS_ERR(glink->mbox_chan)) { 1583 if (PTR_ERR(glink->mbox_chan) != -EPROBE_DEFER) 1584 dev_err(dev, "failed to acquire IPC channel\n"); 1585 return ERR_CAST(glink->mbox_chan); 1586 } 1587 1588 irq = of_irq_get(dev->of_node, 0); 1589 ret = devm_request_irq(dev, irq, 1590 qcom_glink_native_intr, 1591 IRQF_NO_SUSPEND | IRQF_SHARED, 1592 "glink-native", glink); 1593 if (ret) { 1594 dev_err(dev, "failed to request IRQ\n"); 1595 return ERR_PTR(ret); 1596 } 1597 1598 glink->irq = irq; 1599 1600 ret = qcom_glink_send_version(glink); 1601 if (ret) 1602 return ERR_PTR(ret); 1603 1604 return glink; 1605 } 1606 EXPORT_SYMBOL_GPL(qcom_glink_native_probe); 1607 1608 static int qcom_glink_remove_device(struct device *dev, void *data) 1609 { 1610 device_unregister(dev); 1611 1612 return 0; 1613 } 1614 1615 void qcom_glink_native_remove(struct qcom_glink *glink) 1616 { 1617 struct glink_channel *channel; 1618 int cid; 1619 int ret; 1620 unsigned long flags; 1621 1622 disable_irq(glink->irq); 1623 cancel_work_sync(&glink->rx_work); 1624 1625 ret = device_for_each_child(glink->dev, NULL, qcom_glink_remove_device); 1626 if (ret) 1627 dev_warn(glink->dev, "Can't remove GLINK devices: %d\n", ret); 1628 1629 spin_lock_irqsave(&glink->idr_lock, flags); 1630 /* Release any defunct local channels, waiting for close-ack */ 1631 idr_for_each_entry(&glink->lcids, channel, cid) 1632 kref_put(&channel->refcount, qcom_glink_channel_release); 1633 1634 idr_destroy(&glink->lcids); 1635 idr_destroy(&glink->rcids); 1636 spin_unlock_irqrestore(&glink->idr_lock, flags); 1637 mbox_free_channel(glink->mbox_chan); 1638 } 1639 EXPORT_SYMBOL_GPL(qcom_glink_native_remove); 1640 1641 void qcom_glink_native_unregister(struct qcom_glink *glink) 1642 { 1643 device_unregister(glink->dev); 1644 } 1645 EXPORT_SYMBOL_GPL(qcom_glink_native_unregister); 1646 1647 MODULE_DESCRIPTION("Qualcomm GLINK driver"); 1648 MODULE_LICENSE("GPL v2"); 1649