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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
22enum dma_test_frame_pdf {
23 DMA_TEST_PDF_FRAME_START = 1,
24 DMA_TEST_PDF_FRAME_END,
25};
26
27struct dma_test_frame {
28 struct dma_test *dma_test;
29 void *data;
30 struct ring_frame frame;
31};
32
33enum 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
45static 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
57enum dma_test_result {
58 DMA_TEST_NOT_RUN,
59 DMA_TEST_SUCCESS,
60 DMA_TEST_FAIL,
61};
62
63static 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};
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91
92struct 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 unsigned int 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
115static const uuid_t dma_test_dir_uuid =
116 UUID_INIT(0x3188cd10, 0x6523, 0x4a5a,
117 0xa6, 0x82, 0xfd, 0xca, 0x07, 0xa2, 0x48, 0xd8);
118
119static struct tb_property_dir *dma_test_dir;
120static void *dma_test_pattern;
121
122static 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
136static 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
145
146
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 : 0,
196 dt->rx_hopid,
197 dt->rx_ring ? dt->rx_ring->hop : 0);
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
211static 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 : 0,
222 dt->rx_hopid,
223 dt->rx_ring ? dt->rx_ring->hop : 0);
224 if (ret)
225 dev_warn(&dt->svc->dev, "failed to disable DMA paths\n");
226
227 dma_test_free_rings(dt);
228}
229
230static 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
261static 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
299static 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
312static 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;
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) \
359static 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} \
372static 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} \
388DEFINE_DEBUGFS_ATTRIBUTE(__fops ## _fops, __fops ## _show, \
389 __fops ## _store, "%llu\n")
390
391static void lanes_get(const struct dma_test *dt, u64 *val)
392{
393 *val = dt->link_width;
394}
395
396static int lanes_validate(u64 val)
397{
398 return val > 2 ? -EINVAL : 0;
399}
400
401static void lanes_set(struct dma_test *dt, u64 val)
402{
403 dt->link_width = val;
404}
405DMA_TEST_DEBUGFS_ATTR(lanes, lanes_get, lanes_validate, lanes_set);
406
407static void speed_get(const struct dma_test *dt, u64 *val)
408{
409 *val = dt->link_speed;
410}
411
412static int speed_validate(u64 val)
413{
414 switch (val) {
415 case 20:
416 case 10:
417 case 0:
418 return 0;
419 default:
420 return -EINVAL;
421 }
422}
423
424static void speed_set(struct dma_test *dt, u64 val)
425{
426 dt->link_speed = val;
427}
428DMA_TEST_DEBUGFS_ATTR(speed, speed_get, speed_validate, speed_set);
429
430static void packets_to_receive_get(const struct dma_test *dt, u64 *val)
431{
432 *val = dt->packets_to_receive;
433}
434
435static int packets_to_receive_validate(u64 val)
436{
437 return val > DMA_TEST_MAX_PACKETS ? -EINVAL : 0;
438}
439
440static void packets_to_receive_set(struct dma_test *dt, u64 val)
441{
442 dt->packets_to_receive = val;
443}
444DMA_TEST_DEBUGFS_ATTR(packets_to_receive, packets_to_receive_get,
445 packets_to_receive_validate, packets_to_receive_set);
446
447static void packets_to_send_get(const struct dma_test *dt, u64 *val)
448{
449 *val = dt->packets_to_send;
450}
451
452static int packets_to_send_validate(u64 val)
453{
454 return val > DMA_TEST_MAX_PACKETS ? -EINVAL : 0;
455}
456
457static void packets_to_send_set(struct dma_test *dt, u64 val)
458{
459 dt->packets_to_send = val;
460}
461DMA_TEST_DEBUGFS_ATTR(packets_to_send, packets_to_send_get,
462 packets_to_send_validate, packets_to_send_set);
463
464static int dma_test_set_bonding(struct dma_test *dt)
465{
466 switch (dt->link_width) {
467 case 2:
468 return tb_xdomain_lane_bonding_enable(dt->xd);
469 case 1:
470 tb_xdomain_lane_bonding_disable(dt->xd);
471 fallthrough;
472 default:
473 return 0;
474 }
475}
476
477static bool dma_test_validate_config(struct dma_test *dt)
478{
479 if (!dt->packets_to_send && !dt->packets_to_receive)
480 return false;
481 if (dt->packets_to_send && dt->packets_to_receive &&
482 dt->packets_to_send != dt->packets_to_receive)
483 return false;
484 return true;
485}
486
487static void dma_test_check_errors(struct dma_test *dt, int ret)
488{
489 if (!dt->error_code) {
490 if (dt->link_speed && dt->xd->link_speed != dt->link_speed) {
491 dt->error_code = DMA_TEST_SPEED_ERROR;
492 } else if (dt->link_width &&
493 dt->xd->link_width != dt->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
507static 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
582out_stop:
583 dma_test_stop_rings(dt);
584out_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}
591DEFINE_DEBUGFS_ATTRIBUTE(test_fops, NULL, test_store, "%llu\n");
592
593static 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
614out_unlock:
615 mutex_unlock(&dt->lock);
616 return 0;
617}
618DEFINE_SHOW_ATTRIBUTE(status);
619
620static 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
636static 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
656static 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
665static int __maybe_unused dma_test_suspend(struct device *dev)
666{
667
668
669
670
671
672
673
674
675 return 0;
676}
677
678static int __maybe_unused dma_test_resume(struct device *dev)
679{
680 return 0;
681}
682
683static const struct dev_pm_ops dma_test_pm_ops = {
684 SET_SYSTEM_SLEEP_PM_OPS(dma_test_suspend, dma_test_resume)
685};
686
687static const struct tb_service_id dma_test_ids[] = {
688 { TB_SERVICE("dma_test", 1) },
689 { },
690};
691MODULE_DEVICE_TABLE(tbsvc, dma_test_ids);
692
693static 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
704static 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
737err_unregister_dir:
738 tb_unregister_property_dir("dma_test", dma_test_dir);
739err_free_dir:
740 tb_property_free_dir(dma_test_dir);
741err_free_pattern:
742 kfree(dma_test_pattern);
743
744 return ret;
745}
746module_init(dma_test_init);
747
748static 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}
755module_exit(dma_test_exit);
756
757MODULE_AUTHOR("Isaac Hazan <isaac.hazan@intel.com>");
758MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
759MODULE_DESCRIPTION("DMA traffic test driver");
760MODULE_LICENSE("GPL v2");
761
