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Linux 6.13-rc4
[linux.git] / drivers / thunderbolt / dma_test.c
blob9e47a63f28e786c297adacddab0137bf0c4fe6ce
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");
Linux Kernel