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edc0f494 IH |
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 | ||
edc0f494 IH |
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 | ||
edc0f494 IH |
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 | |
180b0689 | 74 | * @rx_hopid: HopID used for receiving frames |
edc0f494 | 75 | * @tx_ring: Software ring holding TX frames |
180b0689 | 76 | * @tx_hopid: HopID used for sending fames |
edc0f494 IH |
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; | |
180b0689 | 96 | int rx_hopid; |
edc0f494 | 97 | struct tb_ring *tx_ring; |
180b0689 | 98 | int tx_hopid; |
edc0f494 IH |
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 | /* 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) { | |
180b0689 | 125 | tb_xdomain_release_in_hopid(dt->xd, dt->rx_hopid); |
edc0f494 IH |
126 | tb_ring_free(dt->rx_ring); |
127 | dt->rx_ring = NULL; | |
128 | } | |
129 | if (dt->tx_ring) { | |
180b0689 | 130 | tb_xdomain_release_out_hopid(dt->xd, dt->tx_hopid); |
edc0f494 IH |
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; | |
180b0689 MW |
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; | |
edc0f494 IH |
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; | |
180b0689 MW |
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; | |
edc0f494 IH |
192 | } |
193 | ||
180b0689 | 194 | ret = tb_xdomain_enable_paths(dt->xd, dt->tx_hopid, |
edc0f494 | 195 | dt->tx_ring ? dt->tx_ring->hop : 0, |
180b0689 | 196 | dt->rx_hopid, |
edc0f494 IH |
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 | ||
211 | static void dma_test_stop_rings(struct dma_test *dt) | |
212 | { | |
180b0689 MW |
213 | int ret; |
214 | ||
edc0f494 IH |
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 | ||
180b0689 MW |
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) | |
edc0f494 IH |
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 | ||
82096ecf | 328 | tf->data = kmemdup(dma_test_pattern, DMA_TEST_FRAME_SIZE, GFP_KERNEL); |
edc0f494 IH |
329 | if (!tf->data) { |
330 | kfree(tf); | |
331 | return -ENOMEM; | |
332 | } | |
333 | ||
edc0f494 IH |
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 20: | |
416 | case 10: | |
417 | case 0: | |
418 | return 0; | |
419 | default: | |
420 | return -EINVAL; | |
421 | } | |
422 | } | |
423 | ||
424 | static void speed_set(struct dma_test *dt, u64 val) | |
425 | { | |
426 | dt->link_speed = val; | |
427 | } | |
428 | DMA_TEST_DEBUGFS_ATTR(speed, speed_get, speed_validate, speed_set); | |
429 | ||
430 | static void packets_to_receive_get(const struct dma_test *dt, u64 *val) | |
431 | { | |
432 | *val = dt->packets_to_receive; | |
433 | } | |
434 | ||
435 | static int packets_to_receive_validate(u64 val) | |
436 | { | |
437 | return val > DMA_TEST_MAX_PACKETS ? -EINVAL : 0; | |
438 | } | |
439 | ||
440 | static void packets_to_receive_set(struct dma_test *dt, u64 val) | |
441 | { | |
442 | dt->packets_to_receive = val; | |
443 | } | |
444 | DMA_TEST_DEBUGFS_ATTR(packets_to_receive, packets_to_receive_get, | |
445 | packets_to_receive_validate, packets_to_receive_set); | |
446 | ||
447 | static void packets_to_send_get(const struct dma_test *dt, u64 *val) | |
448 | { | |
449 | *val = dt->packets_to_send; | |
450 | } | |
451 | ||
452 | static int packets_to_send_validate(u64 val) | |
453 | { | |
454 | return val > DMA_TEST_MAX_PACKETS ? -EINVAL : 0; | |
455 | } | |
456 | ||
457 | static void packets_to_send_set(struct dma_test *dt, u64 val) | |
458 | { | |
459 | dt->packets_to_send = val; | |
460 | } | |
461 | DMA_TEST_DEBUGFS_ATTR(packets_to_send, packets_to_send_get, | |
462 | packets_to_send_validate, packets_to_send_set); | |
463 | ||
464 | static 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 | ||
477 | static 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 | ||
487 | static 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 | ||
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("DMA traffic test driver"); | |
760 | MODULE_LICENSE("GPL v2"); |