1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * DMA traffic test driver 4 * 5 * Copyright (C) 2020, Intel Corporation 6 * Authors: Isaac Hazan <isaac.hazan@intel.com> 7 * Mika Westerberg <mika.westerberg@linux.intel.com> 8 */ 9 10 #include <linux/completion.h> 11 #include <linux/debugfs.h> 12 #include <linux/module.h> 13 #include <linux/sizes.h> 14 #include <linux/thunderbolt.h> 15 16 #define DMA_TEST_TX_RING_SIZE 64 17 #define DMA_TEST_RX_RING_SIZE 256 18 #define DMA_TEST_FRAME_SIZE SZ_4K 19 #define DMA_TEST_DATA_PATTERN 0x0123456789abcdefLL 20 #define DMA_TEST_MAX_PACKETS 1000 21 22 enum dma_test_frame_pdf { 23 DMA_TEST_PDF_FRAME_START = 1, 24 DMA_TEST_PDF_FRAME_END, 25 }; 26 27 struct dma_test_frame { 28 struct dma_test *dma_test; 29 void *data; 30 struct ring_frame frame; 31 }; 32 33 enum dma_test_test_error { 34 DMA_TEST_NO_ERROR, 35 DMA_TEST_INTERRUPTED, 36 DMA_TEST_BUFFER_ERROR, 37 DMA_TEST_DMA_ERROR, 38 DMA_TEST_CONFIG_ERROR, 39 DMA_TEST_SPEED_ERROR, 40 DMA_TEST_WIDTH_ERROR, 41 DMA_TEST_BONDING_ERROR, 42 DMA_TEST_PACKET_ERROR, 43 }; 44 45 static const char * const dma_test_error_names[] = { 46 [DMA_TEST_NO_ERROR] = "no errors", 47 [DMA_TEST_INTERRUPTED] = "interrupted by signal", 48 [DMA_TEST_BUFFER_ERROR] = "no memory for packet buffers", 49 [DMA_TEST_DMA_ERROR] = "DMA ring setup failed", 50 [DMA_TEST_CONFIG_ERROR] = "configuration is not valid", 51 [DMA_TEST_SPEED_ERROR] = "unexpected link speed", 52 [DMA_TEST_WIDTH_ERROR] = "unexpected link width", 53 [DMA_TEST_BONDING_ERROR] = "lane bonding configuration error", 54 [DMA_TEST_PACKET_ERROR] = "packet check failed", 55 }; 56 57 enum dma_test_result { 58 DMA_TEST_NOT_RUN, 59 DMA_TEST_SUCCESS, 60 DMA_TEST_FAIL, 61 }; 62 63 static const char * const dma_test_result_names[] = { 64 [DMA_TEST_NOT_RUN] = "not run", 65 [DMA_TEST_SUCCESS] = "success", 66 [DMA_TEST_FAIL] = "failed", 67 }; 68 69 /** 70 * struct dma_test - DMA test device driver private data 71 * @svc: XDomain service the driver is bound to 72 * @xd: XDomain the service belongs to 73 * @rx_ring: Software ring holding RX frames 74 * @rx_hopid: HopID used for receiving frames 75 * @tx_ring: Software ring holding TX frames 76 * @tx_hopid: HopID used for sending fames 77 * @packets_to_send: Number of packets to send 78 * @packets_to_receive: Number of packets to receive 79 * @packets_sent: Actual number of packets sent 80 * @packets_received: Actual number of packets received 81 * @link_speed: Expected link speed (Gb/s), %0 to use whatever is negotiated 82 * @link_width: Expected link width (Gb/s), %0 to use whatever is negotiated 83 * @crc_errors: Number of CRC errors during the test run 84 * @buffer_overflow_errors: Number of buffer overflow errors during the test 85 * run 86 * @result: Result of the last run 87 * @error_code: Error code of the last run 88 * @complete: Used to wait for the Rx to complete 89 * @lock: Lock serializing access to this structure 90 * @debugfs_dir: dentry of this dma_test 91 */ 92 struct dma_test { 93 const struct tb_service *svc; 94 struct tb_xdomain *xd; 95 struct tb_ring *rx_ring; 96 int rx_hopid; 97 struct tb_ring *tx_ring; 98 int tx_hopid; 99 unsigned int packets_to_send; 100 unsigned int packets_to_receive; 101 unsigned int packets_sent; 102 unsigned int packets_received; 103 unsigned int link_speed; 104 enum tb_link_width link_width; 105 unsigned int crc_errors; 106 unsigned int buffer_overflow_errors; 107 enum dma_test_result result; 108 enum dma_test_test_error error_code; 109 struct completion complete; 110 struct mutex lock; 111 struct dentry *debugfs_dir; 112 }; 113 114 /* DMA test property directory UUID: 3188cd10-6523-4a5a-a682-fdca07a248d8 */ 115 static const uuid_t dma_test_dir_uuid = 116 UUID_INIT(0x3188cd10, 0x6523, 0x4a5a, 117 0xa6, 0x82, 0xfd, 0xca, 0x07, 0xa2, 0x48, 0xd8); 118 119 static struct tb_property_dir *dma_test_dir; 120 static void *dma_test_pattern; 121 122 static void dma_test_free_rings(struct dma_test *dt) 123 { 124 if (dt->rx_ring) { 125 tb_xdomain_release_in_hopid(dt->xd, dt->rx_hopid); 126 tb_ring_free(dt->rx_ring); 127 dt->rx_ring = NULL; 128 } 129 if (dt->tx_ring) { 130 tb_xdomain_release_out_hopid(dt->xd, dt->tx_hopid); 131 tb_ring_free(dt->tx_ring); 132 dt->tx_ring = NULL; 133 } 134 } 135 136 static int dma_test_start_rings(struct dma_test *dt) 137 { 138 unsigned int flags = RING_FLAG_FRAME; 139 struct tb_xdomain *xd = dt->xd; 140 int ret, e2e_tx_hop = 0; 141 struct tb_ring *ring; 142 143 /* 144 * If we are both sender and receiver (traffic goes over a 145 * special loopback dongle) enable E2E flow control. This avoids 146 * losing packets. 147 */ 148 if (dt->packets_to_send && dt->packets_to_receive) 149 flags |= RING_FLAG_E2E; 150 151 if (dt->packets_to_send) { 152 ring = tb_ring_alloc_tx(xd->tb->nhi, -1, DMA_TEST_TX_RING_SIZE, 153 flags); 154 if (!ring) 155 return -ENOMEM; 156 157 dt->tx_ring = ring; 158 e2e_tx_hop = ring->hop; 159 160 ret = tb_xdomain_alloc_out_hopid(xd, -1); 161 if (ret < 0) { 162 dma_test_free_rings(dt); 163 return ret; 164 } 165 166 dt->tx_hopid = ret; 167 } 168 169 if (dt->packets_to_receive) { 170 u16 sof_mask, eof_mask; 171 172 sof_mask = BIT(DMA_TEST_PDF_FRAME_START); 173 eof_mask = BIT(DMA_TEST_PDF_FRAME_END); 174 175 ring = tb_ring_alloc_rx(xd->tb->nhi, -1, DMA_TEST_RX_RING_SIZE, 176 flags, e2e_tx_hop, sof_mask, eof_mask, 177 NULL, NULL); 178 if (!ring) { 179 dma_test_free_rings(dt); 180 return -ENOMEM; 181 } 182 183 dt->rx_ring = ring; 184 185 ret = tb_xdomain_alloc_in_hopid(xd, -1); 186 if (ret < 0) { 187 dma_test_free_rings(dt); 188 return ret; 189 } 190 191 dt->rx_hopid = ret; 192 } 193 194 ret = tb_xdomain_enable_paths(dt->xd, dt->tx_hopid, 195 dt->tx_ring ? dt->tx_ring->hop : -1, 196 dt->rx_hopid, 197 dt->rx_ring ? dt->rx_ring->hop : -1); 198 if (ret) { 199 dma_test_free_rings(dt); 200 return ret; 201 } 202 203 if (dt->tx_ring) 204 tb_ring_start(dt->tx_ring); 205 if (dt->rx_ring) 206 tb_ring_start(dt->rx_ring); 207 208 return 0; 209 } 210 211 static void dma_test_stop_rings(struct dma_test *dt) 212 { 213 int ret; 214 215 if (dt->rx_ring) 216 tb_ring_stop(dt->rx_ring); 217 if (dt->tx_ring) 218 tb_ring_stop(dt->tx_ring); 219 220 ret = tb_xdomain_disable_paths(dt->xd, dt->tx_hopid, 221 dt->tx_ring ? dt->tx_ring->hop : -1, 222 dt->rx_hopid, 223 dt->rx_ring ? dt->rx_ring->hop : -1); 224 if (ret) 225 dev_warn(&dt->svc->dev, "failed to disable DMA paths\n"); 226 227 dma_test_free_rings(dt); 228 } 229 230 static void dma_test_rx_callback(struct tb_ring *ring, struct ring_frame *frame, 231 bool canceled) 232 { 233 struct dma_test_frame *tf = container_of(frame, typeof(*tf), frame); 234 struct dma_test *dt = tf->dma_test; 235 struct device *dma_dev = tb_ring_dma_device(dt->rx_ring); 236 237 dma_unmap_single(dma_dev, tf->frame.buffer_phy, DMA_TEST_FRAME_SIZE, 238 DMA_FROM_DEVICE); 239 kfree(tf->data); 240 241 if (canceled) { 242 kfree(tf); 243 return; 244 } 245 246 dt->packets_received++; 247 dev_dbg(&dt->svc->dev, "packet %u/%u received\n", dt->packets_received, 248 dt->packets_to_receive); 249 250 if (tf->frame.flags & RING_DESC_CRC_ERROR) 251 dt->crc_errors++; 252 if (tf->frame.flags & RING_DESC_BUFFER_OVERRUN) 253 dt->buffer_overflow_errors++; 254 255 kfree(tf); 256 257 if (dt->packets_received == dt->packets_to_receive) 258 complete(&dt->complete); 259 } 260 261 static int dma_test_submit_rx(struct dma_test *dt, size_t npackets) 262 { 263 struct device *dma_dev = tb_ring_dma_device(dt->rx_ring); 264 int i; 265 266 for (i = 0; i < npackets; i++) { 267 struct dma_test_frame *tf; 268 dma_addr_t dma_addr; 269 270 tf = kzalloc(sizeof(*tf), GFP_KERNEL); 271 if (!tf) 272 return -ENOMEM; 273 274 tf->data = kzalloc(DMA_TEST_FRAME_SIZE, GFP_KERNEL); 275 if (!tf->data) { 276 kfree(tf); 277 return -ENOMEM; 278 } 279 280 dma_addr = dma_map_single(dma_dev, tf->data, DMA_TEST_FRAME_SIZE, 281 DMA_FROM_DEVICE); 282 if (dma_mapping_error(dma_dev, dma_addr)) { 283 kfree(tf->data); 284 kfree(tf); 285 return -ENOMEM; 286 } 287 288 tf->frame.buffer_phy = dma_addr; 289 tf->frame.callback = dma_test_rx_callback; 290 tf->dma_test = dt; 291 INIT_LIST_HEAD(&tf->frame.list); 292 293 tb_ring_rx(dt->rx_ring, &tf->frame); 294 } 295 296 return 0; 297 } 298 299 static void dma_test_tx_callback(struct tb_ring *ring, struct ring_frame *frame, 300 bool canceled) 301 { 302 struct dma_test_frame *tf = container_of(frame, typeof(*tf), frame); 303 struct dma_test *dt = tf->dma_test; 304 struct device *dma_dev = tb_ring_dma_device(dt->tx_ring); 305 306 dma_unmap_single(dma_dev, tf->frame.buffer_phy, DMA_TEST_FRAME_SIZE, 307 DMA_TO_DEVICE); 308 kfree(tf->data); 309 kfree(tf); 310 } 311 312 static int dma_test_submit_tx(struct dma_test *dt, size_t npackets) 313 { 314 struct device *dma_dev = tb_ring_dma_device(dt->tx_ring); 315 int i; 316 317 for (i = 0; i < npackets; i++) { 318 struct dma_test_frame *tf; 319 dma_addr_t dma_addr; 320 321 tf = kzalloc(sizeof(*tf), GFP_KERNEL); 322 if (!tf) 323 return -ENOMEM; 324 325 tf->frame.size = 0; /* means 4096 */ 326 tf->dma_test = dt; 327 328 tf->data = kmemdup(dma_test_pattern, DMA_TEST_FRAME_SIZE, GFP_KERNEL); 329 if (!tf->data) { 330 kfree(tf); 331 return -ENOMEM; 332 } 333 334 dma_addr = dma_map_single(dma_dev, tf->data, DMA_TEST_FRAME_SIZE, 335 DMA_TO_DEVICE); 336 if (dma_mapping_error(dma_dev, dma_addr)) { 337 kfree(tf->data); 338 kfree(tf); 339 return -ENOMEM; 340 } 341 342 tf->frame.buffer_phy = dma_addr; 343 tf->frame.callback = dma_test_tx_callback; 344 tf->frame.sof = DMA_TEST_PDF_FRAME_START; 345 tf->frame.eof = DMA_TEST_PDF_FRAME_END; 346 INIT_LIST_HEAD(&tf->frame.list); 347 348 dt->packets_sent++; 349 dev_dbg(&dt->svc->dev, "packet %u/%u sent\n", dt->packets_sent, 350 dt->packets_to_send); 351 352 tb_ring_tx(dt->tx_ring, &tf->frame); 353 } 354 355 return 0; 356 } 357 358 #define DMA_TEST_DEBUGFS_ATTR(__fops, __get, __validate, __set) \ 359 static int __fops ## _show(void *data, u64 *val) \ 360 { \ 361 struct tb_service *svc = data; \ 362 struct dma_test *dt = tb_service_get_drvdata(svc); \ 363 int ret; \ 364 \ 365 ret = mutex_lock_interruptible(&dt->lock); \ 366 if (ret) \ 367 return ret; \ 368 __get(dt, val); \ 369 mutex_unlock(&dt->lock); \ 370 return 0; \ 371 } \ 372 static int __fops ## _store(void *data, u64 val) \ 373 { \ 374 struct tb_service *svc = data; \ 375 struct dma_test *dt = tb_service_get_drvdata(svc); \ 376 int ret; \ 377 \ 378 ret = __validate(val); \ 379 if (ret) \ 380 return ret; \ 381 ret = mutex_lock_interruptible(&dt->lock); \ 382 if (ret) \ 383 return ret; \ 384 __set(dt, val); \ 385 mutex_unlock(&dt->lock); \ 386 return 0; \ 387 } \ 388 DEFINE_DEBUGFS_ATTRIBUTE(__fops ## _fops, __fops ## _show, \ 389 __fops ## _store, "%llu\n") 390 391 static void lanes_get(const struct dma_test *dt, u64 *val) 392 { 393 *val = dt->link_width; 394 } 395 396 static int lanes_validate(u64 val) 397 { 398 return val > 2 ? -EINVAL : 0; 399 } 400 401 static void lanes_set(struct dma_test *dt, u64 val) 402 { 403 dt->link_width = val; 404 } 405 DMA_TEST_DEBUGFS_ATTR(lanes, lanes_get, lanes_validate, lanes_set); 406 407 static void speed_get(const struct dma_test *dt, u64 *val) 408 { 409 *val = dt->link_speed; 410 } 411 412 static int speed_validate(u64 val) 413 { 414 switch (val) { 415 case 40: 416 case 20: 417 case 10: 418 case 0: 419 return 0; 420 default: 421 return -EINVAL; 422 } 423 } 424 425 static void speed_set(struct dma_test *dt, u64 val) 426 { 427 dt->link_speed = val; 428 } 429 DMA_TEST_DEBUGFS_ATTR(speed, speed_get, speed_validate, speed_set); 430 431 static void packets_to_receive_get(const struct dma_test *dt, u64 *val) 432 { 433 *val = dt->packets_to_receive; 434 } 435 436 static int packets_to_receive_validate(u64 val) 437 { 438 return val > DMA_TEST_MAX_PACKETS ? -EINVAL : 0; 439 } 440 441 static void packets_to_receive_set(struct dma_test *dt, u64 val) 442 { 443 dt->packets_to_receive = val; 444 } 445 DMA_TEST_DEBUGFS_ATTR(packets_to_receive, packets_to_receive_get, 446 packets_to_receive_validate, packets_to_receive_set); 447 448 static void packets_to_send_get(const struct dma_test *dt, u64 *val) 449 { 450 *val = dt->packets_to_send; 451 } 452 453 static int packets_to_send_validate(u64 val) 454 { 455 return val > DMA_TEST_MAX_PACKETS ? -EINVAL : 0; 456 } 457 458 static void packets_to_send_set(struct dma_test *dt, u64 val) 459 { 460 dt->packets_to_send = val; 461 } 462 DMA_TEST_DEBUGFS_ATTR(packets_to_send, packets_to_send_get, 463 packets_to_send_validate, packets_to_send_set); 464 465 static int dma_test_set_bonding(struct dma_test *dt) 466 { 467 switch (dt->link_width) { 468 case TB_LINK_WIDTH_DUAL: 469 return tb_xdomain_lane_bonding_enable(dt->xd); 470 case TB_LINK_WIDTH_SINGLE: 471 tb_xdomain_lane_bonding_disable(dt->xd); 472 fallthrough; 473 default: 474 return 0; 475 } 476 } 477 478 static bool dma_test_validate_config(struct dma_test *dt) 479 { 480 if (!dt->packets_to_send && !dt->packets_to_receive) 481 return false; 482 if (dt->packets_to_send && dt->packets_to_receive && 483 dt->packets_to_send != dt->packets_to_receive) 484 return false; 485 return true; 486 } 487 488 static void dma_test_check_errors(struct dma_test *dt, int ret) 489 { 490 if (!dt->error_code) { 491 if (dt->link_speed && dt->xd->link_speed != dt->link_speed) { 492 dt->error_code = DMA_TEST_SPEED_ERROR; 493 } else if (dt->link_width && dt->link_width != dt->xd->link_width) { 494 dt->error_code = DMA_TEST_WIDTH_ERROR; 495 } else if (dt->packets_to_send != dt->packets_sent || 496 dt->packets_to_receive != dt->packets_received || 497 dt->crc_errors || dt->buffer_overflow_errors) { 498 dt->error_code = DMA_TEST_PACKET_ERROR; 499 } else { 500 return; 501 } 502 } 503 504 dt->result = DMA_TEST_FAIL; 505 } 506 507 static int test_store(void *data, u64 val) 508 { 509 struct tb_service *svc = data; 510 struct dma_test *dt = tb_service_get_drvdata(svc); 511 int ret; 512 513 if (val != 1) 514 return -EINVAL; 515 516 ret = mutex_lock_interruptible(&dt->lock); 517 if (ret) 518 return ret; 519 520 dt->packets_sent = 0; 521 dt->packets_received = 0; 522 dt->crc_errors = 0; 523 dt->buffer_overflow_errors = 0; 524 dt->result = DMA_TEST_SUCCESS; 525 dt->error_code = DMA_TEST_NO_ERROR; 526 527 dev_dbg(&svc->dev, "DMA test starting\n"); 528 if (dt->link_speed) 529 dev_dbg(&svc->dev, "link_speed: %u Gb/s\n", dt->link_speed); 530 if (dt->link_width) 531 dev_dbg(&svc->dev, "link_width: %u\n", dt->link_width); 532 dev_dbg(&svc->dev, "packets_to_send: %u\n", dt->packets_to_send); 533 dev_dbg(&svc->dev, "packets_to_receive: %u\n", dt->packets_to_receive); 534 535 if (!dma_test_validate_config(dt)) { 536 dev_err(&svc->dev, "invalid test configuration\n"); 537 dt->error_code = DMA_TEST_CONFIG_ERROR; 538 goto out_unlock; 539 } 540 541 ret = dma_test_set_bonding(dt); 542 if (ret) { 543 dev_err(&svc->dev, "failed to set lanes\n"); 544 dt->error_code = DMA_TEST_BONDING_ERROR; 545 goto out_unlock; 546 } 547 548 ret = dma_test_start_rings(dt); 549 if (ret) { 550 dev_err(&svc->dev, "failed to enable DMA rings\n"); 551 dt->error_code = DMA_TEST_DMA_ERROR; 552 goto out_unlock; 553 } 554 555 if (dt->packets_to_receive) { 556 reinit_completion(&dt->complete); 557 ret = dma_test_submit_rx(dt, dt->packets_to_receive); 558 if (ret) { 559 dev_err(&svc->dev, "failed to submit receive buffers\n"); 560 dt->error_code = DMA_TEST_BUFFER_ERROR; 561 goto out_stop; 562 } 563 } 564 565 if (dt->packets_to_send) { 566 ret = dma_test_submit_tx(dt, dt->packets_to_send); 567 if (ret) { 568 dev_err(&svc->dev, "failed to submit transmit buffers\n"); 569 dt->error_code = DMA_TEST_BUFFER_ERROR; 570 goto out_stop; 571 } 572 } 573 574 if (dt->packets_to_receive) { 575 ret = wait_for_completion_interruptible(&dt->complete); 576 if (ret) { 577 dt->error_code = DMA_TEST_INTERRUPTED; 578 goto out_stop; 579 } 580 } 581 582 out_stop: 583 dma_test_stop_rings(dt); 584 out_unlock: 585 dma_test_check_errors(dt, ret); 586 mutex_unlock(&dt->lock); 587 588 dev_dbg(&svc->dev, "DMA test %s\n", dma_test_result_names[dt->result]); 589 return ret; 590 } 591 DEFINE_DEBUGFS_ATTRIBUTE(test_fops, NULL, test_store, "%llu\n"); 592 593 static int status_show(struct seq_file *s, void *not_used) 594 { 595 struct tb_service *svc = s->private; 596 struct dma_test *dt = tb_service_get_drvdata(svc); 597 int ret; 598 599 ret = mutex_lock_interruptible(&dt->lock); 600 if (ret) 601 return ret; 602 603 seq_printf(s, "result: %s\n", dma_test_result_names[dt->result]); 604 if (dt->result == DMA_TEST_NOT_RUN) 605 goto out_unlock; 606 607 seq_printf(s, "packets received: %u\n", dt->packets_received); 608 seq_printf(s, "packets sent: %u\n", dt->packets_sent); 609 seq_printf(s, "CRC errors: %u\n", dt->crc_errors); 610 seq_printf(s, "buffer overflow errors: %u\n", 611 dt->buffer_overflow_errors); 612 seq_printf(s, "error: %s\n", dma_test_error_names[dt->error_code]); 613 614 out_unlock: 615 mutex_unlock(&dt->lock); 616 return 0; 617 } 618 DEFINE_SHOW_ATTRIBUTE(status); 619 620 static void dma_test_debugfs_init(struct tb_service *svc) 621 { 622 struct dma_test *dt = tb_service_get_drvdata(svc); 623 624 dt->debugfs_dir = debugfs_create_dir("dma_test", svc->debugfs_dir); 625 626 debugfs_create_file("lanes", 0600, dt->debugfs_dir, svc, &lanes_fops); 627 debugfs_create_file("speed", 0600, dt->debugfs_dir, svc, &speed_fops); 628 debugfs_create_file("packets_to_receive", 0600, dt->debugfs_dir, svc, 629 &packets_to_receive_fops); 630 debugfs_create_file("packets_to_send", 0600, dt->debugfs_dir, svc, 631 &packets_to_send_fops); 632 debugfs_create_file("status", 0400, dt->debugfs_dir, svc, &status_fops); 633 debugfs_create_file("test", 0200, dt->debugfs_dir, svc, &test_fops); 634 } 635 636 static int dma_test_probe(struct tb_service *svc, const struct tb_service_id *id) 637 { 638 struct tb_xdomain *xd = tb_service_parent(svc); 639 struct dma_test *dt; 640 641 dt = devm_kzalloc(&svc->dev, sizeof(*dt), GFP_KERNEL); 642 if (!dt) 643 return -ENOMEM; 644 645 dt->svc = svc; 646 dt->xd = xd; 647 mutex_init(&dt->lock); 648 init_completion(&dt->complete); 649 650 tb_service_set_drvdata(svc, dt); 651 dma_test_debugfs_init(svc); 652 653 return 0; 654 } 655 656 static void dma_test_remove(struct tb_service *svc) 657 { 658 struct dma_test *dt = tb_service_get_drvdata(svc); 659 660 mutex_lock(&dt->lock); 661 debugfs_remove_recursive(dt->debugfs_dir); 662 mutex_unlock(&dt->lock); 663 } 664 665 static int __maybe_unused dma_test_suspend(struct device *dev) 666 { 667 /* 668 * No need to do anything special here. If userspace is writing 669 * to the test attribute when suspend started, it comes out from 670 * wait_for_completion_interruptible() with -ERESTARTSYS and the 671 * DMA test fails tearing down the rings. Once userspace is 672 * thawed the kernel restarts the write syscall effectively 673 * re-running the test. 674 */ 675 return 0; 676 } 677 678 static int __maybe_unused dma_test_resume(struct device *dev) 679 { 680 return 0; 681 } 682 683 static const struct dev_pm_ops dma_test_pm_ops = { 684 SET_SYSTEM_SLEEP_PM_OPS(dma_test_suspend, dma_test_resume) 685 }; 686 687 static const struct tb_service_id dma_test_ids[] = { 688 { TB_SERVICE("dma_test", 1) }, 689 { }, 690 }; 691 MODULE_DEVICE_TABLE(tbsvc, dma_test_ids); 692 693 static struct tb_service_driver dma_test_driver = { 694 .driver = { 695 .owner = THIS_MODULE, 696 .name = "thunderbolt_dma_test", 697 .pm = &dma_test_pm_ops, 698 }, 699 .probe = dma_test_probe, 700 .remove = dma_test_remove, 701 .id_table = dma_test_ids, 702 }; 703 704 static int __init dma_test_init(void) 705 { 706 u64 data_value = DMA_TEST_DATA_PATTERN; 707 int i, ret; 708 709 dma_test_pattern = kmalloc(DMA_TEST_FRAME_SIZE, GFP_KERNEL); 710 if (!dma_test_pattern) 711 return -ENOMEM; 712 713 for (i = 0; i < DMA_TEST_FRAME_SIZE / sizeof(data_value); i++) 714 ((u32 *)dma_test_pattern)[i] = data_value++; 715 716 dma_test_dir = tb_property_create_dir(&dma_test_dir_uuid); 717 if (!dma_test_dir) { 718 ret = -ENOMEM; 719 goto err_free_pattern; 720 } 721 722 tb_property_add_immediate(dma_test_dir, "prtcid", 1); 723 tb_property_add_immediate(dma_test_dir, "prtcvers", 1); 724 tb_property_add_immediate(dma_test_dir, "prtcrevs", 0); 725 tb_property_add_immediate(dma_test_dir, "prtcstns", 0); 726 727 ret = tb_register_property_dir("dma_test", dma_test_dir); 728 if (ret) 729 goto err_free_dir; 730 731 ret = tb_register_service_driver(&dma_test_driver); 732 if (ret) 733 goto err_unregister_dir; 734 735 return 0; 736 737 err_unregister_dir: 738 tb_unregister_property_dir("dma_test", dma_test_dir); 739 err_free_dir: 740 tb_property_free_dir(dma_test_dir); 741 err_free_pattern: 742 kfree(dma_test_pattern); 743 744 return ret; 745 } 746 module_init(dma_test_init); 747 748 static void __exit dma_test_exit(void) 749 { 750 tb_unregister_service_driver(&dma_test_driver); 751 tb_unregister_property_dir("dma_test", dma_test_dir); 752 tb_property_free_dir(dma_test_dir); 753 kfree(dma_test_pattern); 754 } 755 module_exit(dma_test_exit); 756 757 MODULE_AUTHOR("Isaac Hazan <isaac.hazan@intel.com>"); 758 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>"); 759 MODULE_DESCRIPTION("Thunderbolt/USB4 DMA traffic test driver"); 760 MODULE_LICENSE("GPL v2"); 761