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