This source file includes following definitions.
- perf_link_is_up
- perf_spad_cmd_send
- perf_spad_cmd_recv
- perf_msg_cmd_send
- perf_msg_cmd_recv
- perf_cmd_send
- perf_cmd_exec
- perf_cmd_recv
- perf_link_event
- perf_db_event
- perf_msg_event
- perf_free_outbuf
- perf_setup_outbuf
- perf_free_inbuf
- perf_setup_inbuf
- perf_service_work
- perf_init_service
- perf_enable_service
- perf_disable_service
- perf_dma_copy_callback
- perf_copy_chunk
- perf_dma_filter
- perf_init_test
- perf_run_test
- perf_sync_test
- perf_clear_test
- perf_thread_work
- perf_set_tcnt
- perf_terminate_test
- perf_submit_test
- perf_read_stats
- perf_init_threads
- perf_clear_threads
- perf_dbgfs_read_info
- perf_dbgfs_read_run
- perf_dbgfs_write_run
- perf_dbgfs_read_tcnt
- perf_dbgfs_write_tcnt
- perf_setup_dbgfs
- perf_clear_dbgfs
- perf_create_data
- perf_setup_peer_mw
- perf_init_peers
- perf_probe
- perf_remove
- perf_init
- perf_exit
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70 #include <linux/init.h>
71 #include <linux/kernel.h>
72 #include <linux/module.h>
73 #include <linux/sched.h>
74 #include <linux/wait.h>
75 #include <linux/dma-mapping.h>
76 #include <linux/dmaengine.h>
77 #include <linux/pci.h>
78 #include <linux/ktime.h>
79 #include <linux/slab.h>
80 #include <linux/delay.h>
81 #include <linux/sizes.h>
82 #include <linux/workqueue.h>
83 #include <linux/debugfs.h>
84 #include <linux/random.h>
85 #include <linux/ntb.h>
86
87 #define DRIVER_NAME "ntb_perf"
88 #define DRIVER_VERSION "2.0"
89
90 MODULE_LICENSE("Dual BSD/GPL");
91 MODULE_VERSION(DRIVER_VERSION);
92 MODULE_AUTHOR("Dave Jiang <dave.jiang@intel.com>");
93 MODULE_DESCRIPTION("PCIe NTB Performance Measurement Tool");
94
95 #define MAX_THREADS_CNT 32
96 #define DEF_THREADS_CNT 1
97 #define MAX_CHUNK_SIZE SZ_1M
98 #define MAX_CHUNK_ORDER 20
99
100 #define DMA_TRIES 100
101 #define DMA_MDELAY 10
102
103 #define MSG_TRIES 1000
104 #define MSG_UDELAY_LOW 1000
105 #define MSG_UDELAY_HIGH 2000
106
107 #define PERF_BUF_LEN 1024
108
109 static unsigned long max_mw_size;
110 module_param(max_mw_size, ulong, 0644);
111 MODULE_PARM_DESC(max_mw_size, "Upper limit of memory window size");
112
113 static unsigned char chunk_order = 19;
114 module_param(chunk_order, byte, 0644);
115 MODULE_PARM_DESC(chunk_order, "Data chunk order [2^n] to transfer");
116
117 static unsigned char total_order = 30;
118 module_param(total_order, byte, 0644);
119 MODULE_PARM_DESC(total_order, "Total data order [2^n] to transfer");
120
121 static bool use_dma;
122 module_param(use_dma, bool, 0644);
123 MODULE_PARM_DESC(use_dma, "Use DMA engine to measure performance");
124
125
126
127
128
129
130 enum perf_cmd {
131 PERF_CMD_INVAL = -1,
132 PERF_CMD_SSIZE = 0,
133 PERF_CMD_RSIZE = 1,
134 PERF_CMD_SXLAT = 2,
135 PERF_CMD_RXLAT = 3,
136 PERF_CMD_CLEAR = 4,
137 PERF_STS_DONE = 5,
138 PERF_STS_LNKUP = 6,
139 };
140
141 struct perf_ctx;
142
143 struct perf_peer {
144 struct perf_ctx *perf;
145 int pidx;
146 int gidx;
147
148
149 u64 outbuf_xlat;
150 resource_size_t outbuf_size;
151 void __iomem *outbuf;
152
153
154 dma_addr_t inbuf_xlat;
155 resource_size_t inbuf_size;
156 void *inbuf;
157
158
159 struct work_struct service;
160 unsigned long sts;
161 };
162 #define to_peer_service(__work) \
163 container_of(__work, struct perf_peer, service)
164
165 struct perf_thread {
166 struct perf_ctx *perf;
167 int tidx;
168
169
170 atomic_t dma_sync;
171 wait_queue_head_t dma_wait;
172 struct dma_chan *dma_chan;
173
174
175 void *src;
176 u64 copied;
177 ktime_t duration;
178 int status;
179 struct work_struct work;
180 };
181 #define to_thread_work(__work) \
182 container_of(__work, struct perf_thread, work)
183
184 struct perf_ctx {
185 struct ntb_dev *ntb;
186
187
188 int gidx;
189 int pcnt;
190 struct perf_peer *peers;
191
192
193 unsigned long busy_flag;
194 wait_queue_head_t twait;
195 atomic_t tsync;
196 u8 tcnt;
197 struct perf_peer *test_peer;
198 struct perf_thread threads[MAX_THREADS_CNT];
199
200
201 int (*cmd_send)(struct perf_peer *peer, enum perf_cmd cmd, u64 data);
202 int (*cmd_recv)(struct perf_ctx *perf, int *pidx, enum perf_cmd *cmd,
203 u64 *data);
204
205 struct dentry *dbgfs_dir;
206 };
207
208
209
210
211 #define PERF_SPAD_CNT(_pcnt) \
212 (3*((_pcnt) + 1))
213 #define PERF_SPAD_CMD(_gidx) \
214 (3*(_gidx))
215 #define PERF_SPAD_LDATA(_gidx) \
216 (3*(_gidx) + 1)
217 #define PERF_SPAD_HDATA(_gidx) \
218 (3*(_gidx) + 2)
219 #define PERF_SPAD_NOTIFY(_gidx) \
220 (BIT_ULL(_gidx))
221
222
223
224
225 #define PERF_MSG_CNT 3
226 #define PERF_MSG_CMD 0
227 #define PERF_MSG_LDATA 1
228 #define PERF_MSG_HDATA 2
229
230
231
232
233
234
235 static struct dentry *perf_dbgfs_topdir;
236
237 static struct workqueue_struct *perf_wq __read_mostly;
238
239
240
241
242
243
244 static void perf_terminate_test(struct perf_ctx *perf);
245
246 static inline bool perf_link_is_up(struct perf_peer *peer)
247 {
248 u64 link;
249
250 link = ntb_link_is_up(peer->perf->ntb, NULL, NULL);
251 return !!(link & BIT_ULL_MASK(peer->pidx));
252 }
253
254 static int perf_spad_cmd_send(struct perf_peer *peer, enum perf_cmd cmd,
255 u64 data)
256 {
257 struct perf_ctx *perf = peer->perf;
258 int try;
259 u32 sts;
260
261 dev_dbg(&perf->ntb->dev, "CMD send: %d 0x%llx\n", cmd, data);
262
263
264
265
266
267
268
269
270 for (try = 0; try < MSG_TRIES; try++) {
271 if (!perf_link_is_up(peer))
272 return -ENOLINK;
273
274 sts = ntb_peer_spad_read(perf->ntb, peer->pidx,
275 PERF_SPAD_CMD(perf->gidx));
276 if (sts != PERF_CMD_INVAL) {
277 usleep_range(MSG_UDELAY_LOW, MSG_UDELAY_HIGH);
278 continue;
279 }
280
281 ntb_peer_spad_write(perf->ntb, peer->pidx,
282 PERF_SPAD_LDATA(perf->gidx),
283 lower_32_bits(data));
284 ntb_peer_spad_write(perf->ntb, peer->pidx,
285 PERF_SPAD_HDATA(perf->gidx),
286 upper_32_bits(data));
287 ntb_peer_spad_write(perf->ntb, peer->pidx,
288 PERF_SPAD_CMD(perf->gidx),
289 cmd);
290 ntb_peer_db_set(perf->ntb, PERF_SPAD_NOTIFY(peer->gidx));
291
292 dev_dbg(&perf->ntb->dev, "DB ring peer %#llx\n",
293 PERF_SPAD_NOTIFY(peer->gidx));
294
295 break;
296 }
297
298 return try < MSG_TRIES ? 0 : -EAGAIN;
299 }
300
301 static int perf_spad_cmd_recv(struct perf_ctx *perf, int *pidx,
302 enum perf_cmd *cmd, u64 *data)
303 {
304 struct perf_peer *peer;
305 u32 val;
306
307 ntb_db_clear(perf->ntb, PERF_SPAD_NOTIFY(perf->gidx));
308
309
310
311
312
313
314
315 for (*pidx = 0; *pidx < perf->pcnt; (*pidx)++) {
316 peer = &perf->peers[*pidx];
317
318 if (!perf_link_is_up(peer))
319 continue;
320
321 val = ntb_spad_read(perf->ntb, PERF_SPAD_CMD(peer->gidx));
322 if (val == PERF_CMD_INVAL)
323 continue;
324
325 *cmd = val;
326
327 val = ntb_spad_read(perf->ntb, PERF_SPAD_LDATA(peer->gidx));
328 *data = val;
329
330 val = ntb_spad_read(perf->ntb, PERF_SPAD_HDATA(peer->gidx));
331 *data |= (u64)val << 32;
332
333
334 ntb_spad_write(perf->ntb, PERF_SPAD_CMD(peer->gidx),
335 PERF_CMD_INVAL);
336
337 dev_dbg(&perf->ntb->dev, "CMD recv: %d 0x%llx\n", *cmd, *data);
338
339 return 0;
340 }
341
342 return -ENODATA;
343 }
344
345 static int perf_msg_cmd_send(struct perf_peer *peer, enum perf_cmd cmd,
346 u64 data)
347 {
348 struct perf_ctx *perf = peer->perf;
349 int try, ret;
350 u64 outbits;
351
352 dev_dbg(&perf->ntb->dev, "CMD send: %d 0x%llx\n", cmd, data);
353
354
355
356
357
358
359
360
361 outbits = ntb_msg_outbits(perf->ntb);
362 for (try = 0; try < MSG_TRIES; try++) {
363 if (!perf_link_is_up(peer))
364 return -ENOLINK;
365
366 ret = ntb_msg_clear_sts(perf->ntb, outbits);
367 if (ret)
368 return ret;
369
370 ntb_peer_msg_write(perf->ntb, peer->pidx, PERF_MSG_LDATA,
371 lower_32_bits(data));
372
373 if (ntb_msg_read_sts(perf->ntb) & outbits) {
374 usleep_range(MSG_UDELAY_LOW, MSG_UDELAY_HIGH);
375 continue;
376 }
377
378 ntb_peer_msg_write(perf->ntb, peer->pidx, PERF_MSG_HDATA,
379 upper_32_bits(data));
380
381
382 ntb_peer_msg_write(perf->ntb, peer->pidx, PERF_MSG_CMD, cmd);
383
384 break;
385 }
386
387 return try < MSG_TRIES ? 0 : -EAGAIN;
388 }
389
390 static int perf_msg_cmd_recv(struct perf_ctx *perf, int *pidx,
391 enum perf_cmd *cmd, u64 *data)
392 {
393 u64 inbits;
394 u32 val;
395
396 inbits = ntb_msg_inbits(perf->ntb);
397
398 if (hweight64(ntb_msg_read_sts(perf->ntb) & inbits) < 3)
399 return -ENODATA;
400
401 val = ntb_msg_read(perf->ntb, pidx, PERF_MSG_CMD);
402 *cmd = val;
403
404 val = ntb_msg_read(perf->ntb, pidx, PERF_MSG_LDATA);
405 *data = val;
406
407 val = ntb_msg_read(perf->ntb, pidx, PERF_MSG_HDATA);
408 *data |= (u64)val << 32;
409
410
411 ntb_msg_clear_sts(perf->ntb, inbits);
412
413 dev_dbg(&perf->ntb->dev, "CMD recv: %d 0x%llx\n", *cmd, *data);
414
415 return 0;
416 }
417
418 static int perf_cmd_send(struct perf_peer *peer, enum perf_cmd cmd, u64 data)
419 {
420 struct perf_ctx *perf = peer->perf;
421
422 if (cmd == PERF_CMD_SSIZE || cmd == PERF_CMD_SXLAT)
423 return perf->cmd_send(peer, cmd, data);
424
425 dev_err(&perf->ntb->dev, "Send invalid command\n");
426 return -EINVAL;
427 }
428
429 static int perf_cmd_exec(struct perf_peer *peer, enum perf_cmd cmd)
430 {
431 switch (cmd) {
432 case PERF_CMD_SSIZE:
433 case PERF_CMD_RSIZE:
434 case PERF_CMD_SXLAT:
435 case PERF_CMD_RXLAT:
436 case PERF_CMD_CLEAR:
437 break;
438 default:
439 dev_err(&peer->perf->ntb->dev, "Exec invalid command\n");
440 return -EINVAL;
441 }
442
443
444 set_bit(cmd, &peer->sts);
445
446 dev_dbg(&peer->perf->ntb->dev, "CMD exec: %d\n", cmd);
447
448 (void)queue_work(system_highpri_wq, &peer->service);
449
450 return 0;
451 }
452
453 static int perf_cmd_recv(struct perf_ctx *perf)
454 {
455 struct perf_peer *peer;
456 int ret, pidx, cmd;
457 u64 data;
458
459 while (!(ret = perf->cmd_recv(perf, &pidx, &cmd, &data))) {
460 peer = &perf->peers[pidx];
461
462 switch (cmd) {
463 case PERF_CMD_SSIZE:
464 peer->inbuf_size = data;
465 return perf_cmd_exec(peer, PERF_CMD_RSIZE);
466 case PERF_CMD_SXLAT:
467 peer->outbuf_xlat = data;
468 return perf_cmd_exec(peer, PERF_CMD_RXLAT);
469 default:
470 dev_err(&perf->ntb->dev, "Recv invalid command\n");
471 return -EINVAL;
472 }
473 }
474
475
476 return ret == -ENODATA ? 0 : ret;
477 }
478
479 static void perf_link_event(void *ctx)
480 {
481 struct perf_ctx *perf = ctx;
482 struct perf_peer *peer;
483 bool lnk_up;
484 int pidx;
485
486 for (pidx = 0; pidx < perf->pcnt; pidx++) {
487 peer = &perf->peers[pidx];
488
489 lnk_up = perf_link_is_up(peer);
490
491 if (lnk_up &&
492 !test_and_set_bit(PERF_STS_LNKUP, &peer->sts)) {
493 perf_cmd_exec(peer, PERF_CMD_SSIZE);
494 } else if (!lnk_up &&
495 test_and_clear_bit(PERF_STS_LNKUP, &peer->sts)) {
496 perf_cmd_exec(peer, PERF_CMD_CLEAR);
497 }
498 }
499 }
500
501 static void perf_db_event(void *ctx, int vec)
502 {
503 struct perf_ctx *perf = ctx;
504
505 dev_dbg(&perf->ntb->dev, "DB vec %d mask %#llx bits %#llx\n", vec,
506 ntb_db_vector_mask(perf->ntb, vec), ntb_db_read(perf->ntb));
507
508
509 (void)perf_cmd_recv(perf);
510 }
511
512 static void perf_msg_event(void *ctx)
513 {
514 struct perf_ctx *perf = ctx;
515
516 dev_dbg(&perf->ntb->dev, "Msg status bits %#llx\n",
517 ntb_msg_read_sts(perf->ntb));
518
519
520 (void)perf_cmd_recv(perf);
521 }
522
523 static const struct ntb_ctx_ops perf_ops = {
524 .link_event = perf_link_event,
525 .db_event = perf_db_event,
526 .msg_event = perf_msg_event
527 };
528
529 static void perf_free_outbuf(struct perf_peer *peer)
530 {
531 (void)ntb_peer_mw_clear_trans(peer->perf->ntb, peer->pidx, peer->gidx);
532 }
533
534 static int perf_setup_outbuf(struct perf_peer *peer)
535 {
536 struct perf_ctx *perf = peer->perf;
537 int ret;
538
539
540 ret = ntb_peer_mw_set_trans(perf->ntb, peer->pidx, peer->gidx,
541 peer->outbuf_xlat, peer->outbuf_size);
542 if (ret) {
543 dev_err(&perf->ntb->dev, "Failed to set outbuf translation\n");
544 return ret;
545 }
546
547
548 set_bit(PERF_STS_DONE, &peer->sts);
549
550 return 0;
551 }
552
553 static void perf_free_inbuf(struct perf_peer *peer)
554 {
555 if (!peer->inbuf)
556 return;
557
558 (void)ntb_mw_clear_trans(peer->perf->ntb, peer->pidx, peer->gidx);
559 dma_free_coherent(&peer->perf->ntb->dev, peer->inbuf_size,
560 peer->inbuf, peer->inbuf_xlat);
561 peer->inbuf = NULL;
562 }
563
564 static int perf_setup_inbuf(struct perf_peer *peer)
565 {
566 resource_size_t xlat_align, size_align, size_max;
567 struct perf_ctx *perf = peer->perf;
568 int ret;
569
570
571 ret = ntb_mw_get_align(perf->ntb, peer->pidx, perf->gidx,
572 &xlat_align, &size_align, &size_max);
573 if (ret) {
574 dev_err(&perf->ntb->dev, "Couldn't get inbuf restrictions\n");
575 return ret;
576 }
577
578 if (peer->inbuf_size > size_max) {
579 dev_err(&perf->ntb->dev, "Too big inbuf size %pa > %pa\n",
580 &peer->inbuf_size, &size_max);
581 return -EINVAL;
582 }
583
584 peer->inbuf_size = round_up(peer->inbuf_size, size_align);
585
586 perf_free_inbuf(peer);
587
588 peer->inbuf = dma_alloc_coherent(&perf->ntb->dev, peer->inbuf_size,
589 &peer->inbuf_xlat, GFP_KERNEL);
590 if (!peer->inbuf) {
591 dev_err(&perf->ntb->dev, "Failed to alloc inbuf of %pa\n",
592 &peer->inbuf_size);
593 return -ENOMEM;
594 }
595 if (!IS_ALIGNED(peer->inbuf_xlat, xlat_align)) {
596 dev_err(&perf->ntb->dev, "Unaligned inbuf allocated\n");
597 goto err_free_inbuf;
598 }
599
600 ret = ntb_mw_set_trans(perf->ntb, peer->pidx, peer->gidx,
601 peer->inbuf_xlat, peer->inbuf_size);
602 if (ret) {
603 dev_err(&perf->ntb->dev, "Failed to set inbuf translation\n");
604 goto err_free_inbuf;
605 }
606
607
608
609
610
611
612 (void)perf_cmd_exec(peer, PERF_CMD_SXLAT);
613
614 return 0;
615
616 err_free_inbuf:
617 perf_free_inbuf(peer);
618
619 return ret;
620 }
621
622 static void perf_service_work(struct work_struct *work)
623 {
624 struct perf_peer *peer = to_peer_service(work);
625
626 if (test_and_clear_bit(PERF_CMD_SSIZE, &peer->sts))
627 perf_cmd_send(peer, PERF_CMD_SSIZE, peer->outbuf_size);
628
629 if (test_and_clear_bit(PERF_CMD_RSIZE, &peer->sts))
630 perf_setup_inbuf(peer);
631
632 if (test_and_clear_bit(PERF_CMD_SXLAT, &peer->sts))
633 perf_cmd_send(peer, PERF_CMD_SXLAT, peer->inbuf_xlat);
634
635 if (test_and_clear_bit(PERF_CMD_RXLAT, &peer->sts))
636 perf_setup_outbuf(peer);
637
638 if (test_and_clear_bit(PERF_CMD_CLEAR, &peer->sts)) {
639 clear_bit(PERF_STS_DONE, &peer->sts);
640 if (test_bit(0, &peer->perf->busy_flag) &&
641 peer == peer->perf->test_peer) {
642 dev_warn(&peer->perf->ntb->dev,
643 "Freeing while test on-fly\n");
644 perf_terminate_test(peer->perf);
645 }
646 perf_free_outbuf(peer);
647 perf_free_inbuf(peer);
648 }
649 }
650
651 static int perf_init_service(struct perf_ctx *perf)
652 {
653 u64 mask;
654
655 if (ntb_peer_mw_count(perf->ntb) < perf->pcnt + 1) {
656 dev_err(&perf->ntb->dev, "Not enough memory windows\n");
657 return -EINVAL;
658 }
659
660 if (ntb_msg_count(perf->ntb) >= PERF_MSG_CNT) {
661 perf->cmd_send = perf_msg_cmd_send;
662 perf->cmd_recv = perf_msg_cmd_recv;
663
664 dev_dbg(&perf->ntb->dev, "Message service initialized\n");
665
666 return 0;
667 }
668
669 dev_dbg(&perf->ntb->dev, "Message service unsupported\n");
670
671 mask = GENMASK_ULL(perf->pcnt, 0);
672 if (ntb_spad_count(perf->ntb) >= PERF_SPAD_CNT(perf->pcnt) &&
673 (ntb_db_valid_mask(perf->ntb) & mask) == mask) {
674 perf->cmd_send = perf_spad_cmd_send;
675 perf->cmd_recv = perf_spad_cmd_recv;
676
677 dev_dbg(&perf->ntb->dev, "Scratchpad service initialized\n");
678
679 return 0;
680 }
681
682 dev_dbg(&perf->ntb->dev, "Scratchpad service unsupported\n");
683
684 dev_err(&perf->ntb->dev, "Command services unsupported\n");
685
686 return -EINVAL;
687 }
688
689 static int perf_enable_service(struct perf_ctx *perf)
690 {
691 u64 mask, incmd_bit;
692 int ret, sidx, scnt;
693
694 mask = ntb_db_valid_mask(perf->ntb);
695 (void)ntb_db_set_mask(perf->ntb, mask);
696
697 ret = ntb_set_ctx(perf->ntb, perf, &perf_ops);
698 if (ret)
699 return ret;
700
701 if (perf->cmd_send == perf_msg_cmd_send) {
702 u64 inbits, outbits;
703
704 inbits = ntb_msg_inbits(perf->ntb);
705 outbits = ntb_msg_outbits(perf->ntb);
706 (void)ntb_msg_set_mask(perf->ntb, inbits | outbits);
707
708 incmd_bit = BIT_ULL(__ffs64(inbits));
709 ret = ntb_msg_clear_mask(perf->ntb, incmd_bit);
710
711 dev_dbg(&perf->ntb->dev, "MSG sts unmasked %#llx\n", incmd_bit);
712 } else {
713 scnt = ntb_spad_count(perf->ntb);
714 for (sidx = 0; sidx < scnt; sidx++)
715 ntb_spad_write(perf->ntb, sidx, PERF_CMD_INVAL);
716 incmd_bit = PERF_SPAD_NOTIFY(perf->gidx);
717 ret = ntb_db_clear_mask(perf->ntb, incmd_bit);
718
719 dev_dbg(&perf->ntb->dev, "DB bits unmasked %#llx\n", incmd_bit);
720 }
721 if (ret) {
722 ntb_clear_ctx(perf->ntb);
723 return ret;
724 }
725
726 ntb_link_enable(perf->ntb, NTB_SPEED_AUTO, NTB_WIDTH_AUTO);
727
728 ntb_link_event(perf->ntb);
729
730 return 0;
731 }
732
733 static void perf_disable_service(struct perf_ctx *perf)
734 {
735 int pidx;
736
737 if (perf->cmd_send == perf_msg_cmd_send) {
738 u64 inbits;
739
740 inbits = ntb_msg_inbits(perf->ntb);
741 (void)ntb_msg_set_mask(perf->ntb, inbits);
742 } else {
743 (void)ntb_db_set_mask(perf->ntb, PERF_SPAD_NOTIFY(perf->gidx));
744 }
745
746 ntb_clear_ctx(perf->ntb);
747
748 for (pidx = 0; pidx < perf->pcnt; pidx++)
749 perf_cmd_exec(&perf->peers[pidx], PERF_CMD_CLEAR);
750
751 for (pidx = 0; pidx < perf->pcnt; pidx++)
752 flush_work(&perf->peers[pidx].service);
753
754 for (pidx = 0; pidx < perf->pcnt; pidx++) {
755 struct perf_peer *peer = &perf->peers[pidx];
756
757 ntb_spad_write(perf->ntb, PERF_SPAD_CMD(peer->gidx), 0);
758 }
759
760 ntb_db_clear(perf->ntb, PERF_SPAD_NOTIFY(perf->gidx));
761
762 ntb_link_disable(perf->ntb);
763 }
764
765
766
767
768
769
770 static void perf_dma_copy_callback(void *data)
771 {
772 struct perf_thread *pthr = data;
773
774 atomic_dec(&pthr->dma_sync);
775 wake_up(&pthr->dma_wait);
776 }
777
778 static int perf_copy_chunk(struct perf_thread *pthr,
779 void __iomem *dst, void *src, size_t len)
780 {
781 struct dma_async_tx_descriptor *tx;
782 struct dmaengine_unmap_data *unmap;
783 struct device *dma_dev;
784 int try = 0, ret = 0;
785
786 if (!use_dma) {
787 memcpy_toio(dst, src, len);
788 goto ret_check_tsync;
789 }
790
791 dma_dev = pthr->dma_chan->device->dev;
792
793 if (!is_dma_copy_aligned(pthr->dma_chan->device, offset_in_page(src),
794 offset_in_page(dst), len))
795 return -EIO;
796
797 unmap = dmaengine_get_unmap_data(dma_dev, 2, GFP_NOWAIT);
798 if (!unmap)
799 return -ENOMEM;
800
801 unmap->len = len;
802 unmap->addr[0] = dma_map_page(dma_dev, virt_to_page(src),
803 offset_in_page(src), len, DMA_TO_DEVICE);
804 if (dma_mapping_error(dma_dev, unmap->addr[0])) {
805 ret = -EIO;
806 goto err_free_resource;
807 }
808 unmap->to_cnt = 1;
809
810 unmap->addr[1] = dma_map_page(dma_dev, virt_to_page(dst),
811 offset_in_page(dst), len, DMA_FROM_DEVICE);
812 if (dma_mapping_error(dma_dev, unmap->addr[1])) {
813 ret = -EIO;
814 goto err_free_resource;
815 }
816 unmap->from_cnt = 1;
817
818 do {
819 tx = dmaengine_prep_dma_memcpy(pthr->dma_chan, unmap->addr[1],
820 unmap->addr[0], len, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
821 if (!tx)
822 msleep(DMA_MDELAY);
823 } while (!tx && (try++ < DMA_TRIES));
824
825 if (!tx) {
826 ret = -EIO;
827 goto err_free_resource;
828 }
829
830 tx->callback = perf_dma_copy_callback;
831 tx->callback_param = pthr;
832 dma_set_unmap(tx, unmap);
833
834 ret = dma_submit_error(dmaengine_submit(tx));
835 if (ret) {
836 dmaengine_unmap_put(unmap);
837 goto err_free_resource;
838 }
839
840 dmaengine_unmap_put(unmap);
841
842 atomic_inc(&pthr->dma_sync);
843 dma_async_issue_pending(pthr->dma_chan);
844
845 ret_check_tsync:
846 return likely(atomic_read(&pthr->perf->tsync) > 0) ? 0 : -EINTR;
847
848 err_free_resource:
849 dmaengine_unmap_put(unmap);
850
851 return ret;
852 }
853
854 static bool perf_dma_filter(struct dma_chan *chan, void *data)
855 {
856 struct perf_ctx *perf = data;
857 int node;
858
859 node = dev_to_node(&perf->ntb->dev);
860
861 return node == NUMA_NO_NODE || node == dev_to_node(chan->device->dev);
862 }
863
864 static int perf_init_test(struct perf_thread *pthr)
865 {
866 struct perf_ctx *perf = pthr->perf;
867 dma_cap_mask_t dma_mask;
868
869 pthr->src = kmalloc_node(perf->test_peer->outbuf_size, GFP_KERNEL,
870 dev_to_node(&perf->ntb->dev));
871 if (!pthr->src)
872 return -ENOMEM;
873
874 get_random_bytes(pthr->src, perf->test_peer->outbuf_size);
875
876 if (!use_dma)
877 return 0;
878
879 dma_cap_zero(dma_mask);
880 dma_cap_set(DMA_MEMCPY, dma_mask);
881 pthr->dma_chan = dma_request_channel(dma_mask, perf_dma_filter, perf);
882 if (!pthr->dma_chan) {
883 dev_err(&perf->ntb->dev, "%d: Failed to get DMA channel\n",
884 pthr->tidx);
885 atomic_dec(&perf->tsync);
886 wake_up(&perf->twait);
887 kfree(pthr->src);
888 return -ENODEV;
889 }
890
891 atomic_set(&pthr->dma_sync, 0);
892
893 return 0;
894 }
895
896 static int perf_run_test(struct perf_thread *pthr)
897 {
898 struct perf_peer *peer = pthr->perf->test_peer;
899 struct perf_ctx *perf = pthr->perf;
900 void __iomem *flt_dst, *bnd_dst;
901 u64 total_size, chunk_size;
902 void *flt_src;
903 int ret = 0;
904
905 total_size = 1ULL << total_order;
906 chunk_size = 1ULL << chunk_order;
907 chunk_size = min_t(u64, peer->outbuf_size, chunk_size);
908
909 flt_src = pthr->src;
910 bnd_dst = peer->outbuf + peer->outbuf_size;
911 flt_dst = peer->outbuf;
912
913 pthr->duration = ktime_get();
914
915
916 while (pthr->copied < total_size) {
917 ret = perf_copy_chunk(pthr, flt_dst, flt_src, chunk_size);
918 if (ret) {
919 dev_err(&perf->ntb->dev, "%d: Got error %d on test\n",
920 pthr->tidx, ret);
921 return ret;
922 }
923
924 pthr->copied += chunk_size;
925
926 flt_dst += chunk_size;
927 flt_src += chunk_size;
928 if (flt_dst >= bnd_dst || flt_dst < peer->outbuf) {
929 flt_dst = peer->outbuf;
930 flt_src = pthr->src;
931 }
932
933
934 schedule();
935 }
936
937 return 0;
938 }
939
940 static int perf_sync_test(struct perf_thread *pthr)
941 {
942 struct perf_ctx *perf = pthr->perf;
943
944 if (!use_dma)
945 goto no_dma_ret;
946
947 wait_event(pthr->dma_wait,
948 (atomic_read(&pthr->dma_sync) == 0 ||
949 atomic_read(&perf->tsync) < 0));
950
951 if (atomic_read(&perf->tsync) < 0)
952 return -EINTR;
953
954 no_dma_ret:
955 pthr->duration = ktime_sub(ktime_get(), pthr->duration);
956
957 dev_dbg(&perf->ntb->dev, "%d: copied %llu bytes\n",
958 pthr->tidx, pthr->copied);
959
960 dev_dbg(&perf->ntb->dev, "%d: lasted %llu usecs\n",
961 pthr->tidx, ktime_to_us(pthr->duration));
962
963 dev_dbg(&perf->ntb->dev, "%d: %llu MBytes/s\n", pthr->tidx,
964 div64_u64(pthr->copied, ktime_to_us(pthr->duration)));
965
966 return 0;
967 }
968
969 static void perf_clear_test(struct perf_thread *pthr)
970 {
971 struct perf_ctx *perf = pthr->perf;
972
973 if (!use_dma)
974 goto no_dma_notify;
975
976
977
978
979
980 (void)dmaengine_terminate_sync(pthr->dma_chan);
981
982 dma_release_channel(pthr->dma_chan);
983
984 no_dma_notify:
985 atomic_dec(&perf->tsync);
986 wake_up(&perf->twait);
987 kfree(pthr->src);
988 }
989
990 static void perf_thread_work(struct work_struct *work)
991 {
992 struct perf_thread *pthr = to_thread_work(work);
993 int ret;
994
995
996
997
998
999
1000
1001
1002 ret = perf_init_test(pthr);
1003 if (ret) {
1004 pthr->status = ret;
1005 return;
1006 }
1007
1008 ret = perf_run_test(pthr);
1009 if (ret) {
1010 pthr->status = ret;
1011 goto err_clear_test;
1012 }
1013
1014 pthr->status = perf_sync_test(pthr);
1015
1016 err_clear_test:
1017 perf_clear_test(pthr);
1018 }
1019
1020 static int perf_set_tcnt(struct perf_ctx *perf, u8 tcnt)
1021 {
1022 if (tcnt == 0 || tcnt > MAX_THREADS_CNT)
1023 return -EINVAL;
1024
1025 if (test_and_set_bit_lock(0, &perf->busy_flag))
1026 return -EBUSY;
1027
1028 perf->tcnt = tcnt;
1029
1030 clear_bit_unlock(0, &perf->busy_flag);
1031
1032 return 0;
1033 }
1034
1035 static void perf_terminate_test(struct perf_ctx *perf)
1036 {
1037 int tidx;
1038
1039 atomic_set(&perf->tsync, -1);
1040 wake_up(&perf->twait);
1041
1042 for (tidx = 0; tidx < MAX_THREADS_CNT; tidx++) {
1043 wake_up(&perf->threads[tidx].dma_wait);
1044 cancel_work_sync(&perf->threads[tidx].work);
1045 }
1046 }
1047
1048 static int perf_submit_test(struct perf_peer *peer)
1049 {
1050 struct perf_ctx *perf = peer->perf;
1051 struct perf_thread *pthr;
1052 int tidx, ret;
1053
1054 if (!test_bit(PERF_STS_DONE, &peer->sts))
1055 return -ENOLINK;
1056
1057 if (test_and_set_bit_lock(0, &perf->busy_flag))
1058 return -EBUSY;
1059
1060 perf->test_peer = peer;
1061 atomic_set(&perf->tsync, perf->tcnt);
1062
1063 for (tidx = 0; tidx < MAX_THREADS_CNT; tidx++) {
1064 pthr = &perf->threads[tidx];
1065
1066 pthr->status = -ENODATA;
1067 pthr->copied = 0;
1068 pthr->duration = ktime_set(0, 0);
1069 if (tidx < perf->tcnt)
1070 (void)queue_work(perf_wq, &pthr->work);
1071 }
1072
1073 ret = wait_event_interruptible(perf->twait,
1074 atomic_read(&perf->tsync) <= 0);
1075 if (ret == -ERESTARTSYS) {
1076 perf_terminate_test(perf);
1077 ret = -EINTR;
1078 }
1079
1080 clear_bit_unlock(0, &perf->busy_flag);
1081
1082 return ret;
1083 }
1084
1085 static int perf_read_stats(struct perf_ctx *perf, char *buf,
1086 size_t size, ssize_t *pos)
1087 {
1088 struct perf_thread *pthr;
1089 int tidx;
1090
1091 if (test_and_set_bit_lock(0, &perf->busy_flag))
1092 return -EBUSY;
1093
1094 (*pos) += scnprintf(buf + *pos, size - *pos,
1095 " Peer %d test statistics:\n", perf->test_peer->pidx);
1096
1097 for (tidx = 0; tidx < MAX_THREADS_CNT; tidx++) {
1098 pthr = &perf->threads[tidx];
1099
1100 if (pthr->status == -ENODATA)
1101 continue;
1102
1103 if (pthr->status) {
1104 (*pos) += scnprintf(buf + *pos, size - *pos,
1105 "%d: error status %d\n", tidx, pthr->status);
1106 continue;
1107 }
1108
1109 (*pos) += scnprintf(buf + *pos, size - *pos,
1110 "%d: copied %llu bytes in %llu usecs, %llu MBytes/s\n",
1111 tidx, pthr->copied, ktime_to_us(pthr->duration),
1112 div64_u64(pthr->copied, ktime_to_us(pthr->duration)));
1113 }
1114
1115 clear_bit_unlock(0, &perf->busy_flag);
1116
1117 return 0;
1118 }
1119
1120 static void perf_init_threads(struct perf_ctx *perf)
1121 {
1122 struct perf_thread *pthr;
1123 int tidx;
1124
1125 perf->tcnt = DEF_THREADS_CNT;
1126 perf->test_peer = &perf->peers[0];
1127 init_waitqueue_head(&perf->twait);
1128
1129 for (tidx = 0; tidx < MAX_THREADS_CNT; tidx++) {
1130 pthr = &perf->threads[tidx];
1131
1132 pthr->perf = perf;
1133 pthr->tidx = tidx;
1134 pthr->status = -ENODATA;
1135 init_waitqueue_head(&pthr->dma_wait);
1136 INIT_WORK(&pthr->work, perf_thread_work);
1137 }
1138 }
1139
1140 static void perf_clear_threads(struct perf_ctx *perf)
1141 {
1142 perf_terminate_test(perf);
1143 }
1144
1145
1146
1147
1148
1149
1150 static ssize_t perf_dbgfs_read_info(struct file *filep, char __user *ubuf,
1151 size_t size, loff_t *offp)
1152 {
1153 struct perf_ctx *perf = filep->private_data;
1154 struct perf_peer *peer;
1155 size_t buf_size;
1156 ssize_t pos = 0;
1157 int ret, pidx;
1158 char *buf;
1159
1160 buf_size = min_t(size_t, size, 0x1000U);
1161
1162 buf = kmalloc(buf_size, GFP_KERNEL);
1163 if (!buf)
1164 return -ENOMEM;
1165
1166 pos += scnprintf(buf + pos, buf_size - pos,
1167 " Performance measuring tool info:\n\n");
1168
1169 pos += scnprintf(buf + pos, buf_size - pos,
1170 "Local port %d, Global index %d\n", ntb_port_number(perf->ntb),
1171 perf->gidx);
1172 pos += scnprintf(buf + pos, buf_size - pos, "Test status: ");
1173 if (test_bit(0, &perf->busy_flag)) {
1174 pos += scnprintf(buf + pos, buf_size - pos,
1175 "on-fly with port %d (%d)\n",
1176 ntb_peer_port_number(perf->ntb, perf->test_peer->pidx),
1177 perf->test_peer->pidx);
1178 } else {
1179 pos += scnprintf(buf + pos, buf_size - pos, "idle\n");
1180 }
1181
1182 for (pidx = 0; pidx < perf->pcnt; pidx++) {
1183 peer = &perf->peers[pidx];
1184
1185 pos += scnprintf(buf + pos, buf_size - pos,
1186 "Port %d (%d), Global index %d:\n",
1187 ntb_peer_port_number(perf->ntb, peer->pidx), peer->pidx,
1188 peer->gidx);
1189
1190 pos += scnprintf(buf + pos, buf_size - pos,
1191 "\tLink status: %s\n",
1192 test_bit(PERF_STS_LNKUP, &peer->sts) ? "up" : "down");
1193
1194 pos += scnprintf(buf + pos, buf_size - pos,
1195 "\tOut buffer addr 0x%pK\n", peer->outbuf);
1196
1197 pos += scnprintf(buf + pos, buf_size - pos,
1198 "\tOut buffer size %pa\n", &peer->outbuf_size);
1199
1200 pos += scnprintf(buf + pos, buf_size - pos,
1201 "\tOut buffer xlat 0x%016llx[p]\n", peer->outbuf_xlat);
1202
1203 if (!peer->inbuf) {
1204 pos += scnprintf(buf + pos, buf_size - pos,
1205 "\tIn buffer addr: unallocated\n");
1206 continue;
1207 }
1208
1209 pos += scnprintf(buf + pos, buf_size - pos,
1210 "\tIn buffer addr 0x%pK\n", peer->inbuf);
1211
1212 pos += scnprintf(buf + pos, buf_size - pos,
1213 "\tIn buffer size %pa\n", &peer->inbuf_size);
1214
1215 pos += scnprintf(buf + pos, buf_size - pos,
1216 "\tIn buffer xlat %pad[p]\n", &peer->inbuf_xlat);
1217 }
1218
1219 ret = simple_read_from_buffer(ubuf, size, offp, buf, pos);
1220 kfree(buf);
1221
1222 return ret;
1223 }
1224
1225 static const struct file_operations perf_dbgfs_info = {
1226 .open = simple_open,
1227 .read = perf_dbgfs_read_info
1228 };
1229
1230 static ssize_t perf_dbgfs_read_run(struct file *filep, char __user *ubuf,
1231 size_t size, loff_t *offp)
1232 {
1233 struct perf_ctx *perf = filep->private_data;
1234 ssize_t ret, pos = 0;
1235 char *buf;
1236
1237 buf = kmalloc(PERF_BUF_LEN, GFP_KERNEL);
1238 if (!buf)
1239 return -ENOMEM;
1240
1241 ret = perf_read_stats(perf, buf, PERF_BUF_LEN, &pos);
1242 if (ret)
1243 goto err_free;
1244
1245 ret = simple_read_from_buffer(ubuf, size, offp, buf, pos);
1246 err_free:
1247 kfree(buf);
1248
1249 return ret;
1250 }
1251
1252 static ssize_t perf_dbgfs_write_run(struct file *filep, const char __user *ubuf,
1253 size_t size, loff_t *offp)
1254 {
1255 struct perf_ctx *perf = filep->private_data;
1256 struct perf_peer *peer;
1257 int pidx, ret;
1258
1259 ret = kstrtoint_from_user(ubuf, size, 0, &pidx);
1260 if (ret)
1261 return ret;
1262
1263 if (pidx < 0 || pidx >= perf->pcnt)
1264 return -EINVAL;
1265
1266 peer = &perf->peers[pidx];
1267
1268 ret = perf_submit_test(peer);
1269 if (ret)
1270 return ret;
1271
1272 return size;
1273 }
1274
1275 static const struct file_operations perf_dbgfs_run = {
1276 .open = simple_open,
1277 .read = perf_dbgfs_read_run,
1278 .write = perf_dbgfs_write_run
1279 };
1280
1281 static ssize_t perf_dbgfs_read_tcnt(struct file *filep, char __user *ubuf,
1282 size_t size, loff_t *offp)
1283 {
1284 struct perf_ctx *perf = filep->private_data;
1285 char buf[8];
1286 ssize_t pos;
1287
1288 pos = scnprintf(buf, sizeof(buf), "%hhu\n", perf->tcnt);
1289
1290 return simple_read_from_buffer(ubuf, size, offp, buf, pos);
1291 }
1292
1293 static ssize_t perf_dbgfs_write_tcnt(struct file *filep,
1294 const char __user *ubuf,
1295 size_t size, loff_t *offp)
1296 {
1297 struct perf_ctx *perf = filep->private_data;
1298 int ret;
1299 u8 val;
1300
1301 ret = kstrtou8_from_user(ubuf, size, 0, &val);
1302 if (ret)
1303 return ret;
1304
1305 ret = perf_set_tcnt(perf, val);
1306 if (ret)
1307 return ret;
1308
1309 return size;
1310 }
1311
1312 static const struct file_operations perf_dbgfs_tcnt = {
1313 .open = simple_open,
1314 .read = perf_dbgfs_read_tcnt,
1315 .write = perf_dbgfs_write_tcnt
1316 };
1317
1318 static void perf_setup_dbgfs(struct perf_ctx *perf)
1319 {
1320 struct pci_dev *pdev = perf->ntb->pdev;
1321
1322 perf->dbgfs_dir = debugfs_create_dir(pci_name(pdev), perf_dbgfs_topdir);
1323 if (!perf->dbgfs_dir) {
1324 dev_warn(&perf->ntb->dev, "DebugFS unsupported\n");
1325 return;
1326 }
1327
1328 debugfs_create_file("info", 0600, perf->dbgfs_dir, perf,
1329 &perf_dbgfs_info);
1330
1331 debugfs_create_file("run", 0600, perf->dbgfs_dir, perf,
1332 &perf_dbgfs_run);
1333
1334 debugfs_create_file("threads_count", 0600, perf->dbgfs_dir, perf,
1335 &perf_dbgfs_tcnt);
1336
1337
1338 debugfs_create_u8("chunk_order", 0500, perf->dbgfs_dir, &chunk_order);
1339
1340 debugfs_create_u8("total_order", 0500, perf->dbgfs_dir, &total_order);
1341
1342 debugfs_create_bool("use_dma", 0500, perf->dbgfs_dir, &use_dma);
1343 }
1344
1345 static void perf_clear_dbgfs(struct perf_ctx *perf)
1346 {
1347 debugfs_remove_recursive(perf->dbgfs_dir);
1348 }
1349
1350
1351
1352
1353
1354
1355 static struct perf_ctx *perf_create_data(struct ntb_dev *ntb)
1356 {
1357 struct perf_ctx *perf;
1358
1359 perf = devm_kzalloc(&ntb->dev, sizeof(*perf), GFP_KERNEL);
1360 if (!perf)
1361 return ERR_PTR(-ENOMEM);
1362
1363 perf->pcnt = ntb_peer_port_count(ntb);
1364 perf->peers = devm_kcalloc(&ntb->dev, perf->pcnt, sizeof(*perf->peers),
1365 GFP_KERNEL);
1366 if (!perf->peers)
1367 return ERR_PTR(-ENOMEM);
1368
1369 perf->ntb = ntb;
1370
1371 return perf;
1372 }
1373
1374 static int perf_setup_peer_mw(struct perf_peer *peer)
1375 {
1376 struct perf_ctx *perf = peer->perf;
1377 phys_addr_t phys_addr;
1378 int ret;
1379
1380
1381 ret = ntb_peer_mw_get_addr(perf->ntb, perf->gidx, &phys_addr,
1382 &peer->outbuf_size);
1383 if (ret)
1384 return ret;
1385
1386 peer->outbuf = devm_ioremap_wc(&perf->ntb->dev, phys_addr,
1387 peer->outbuf_size);
1388 if (!peer->outbuf)
1389 return -ENOMEM;
1390
1391 if (max_mw_size && peer->outbuf_size > max_mw_size) {
1392 peer->outbuf_size = max_mw_size;
1393 dev_warn(&peer->perf->ntb->dev,
1394 "Peer %d outbuf reduced to %pa\n", peer->pidx,
1395 &peer->outbuf_size);
1396 }
1397
1398 return 0;
1399 }
1400
1401 static int perf_init_peers(struct perf_ctx *perf)
1402 {
1403 struct perf_peer *peer;
1404 int pidx, lport, ret;
1405
1406 lport = ntb_port_number(perf->ntb);
1407 perf->gidx = -1;
1408 for (pidx = 0; pidx < perf->pcnt; pidx++) {
1409 peer = &perf->peers[pidx];
1410
1411 peer->perf = perf;
1412 peer->pidx = pidx;
1413 if (lport < ntb_peer_port_number(perf->ntb, pidx)) {
1414 if (perf->gidx == -1)
1415 perf->gidx = pidx;
1416 peer->gidx = pidx + 1;
1417 } else {
1418 peer->gidx = pidx;
1419 }
1420 INIT_WORK(&peer->service, perf_service_work);
1421 }
1422 if (perf->gidx == -1)
1423 perf->gidx = pidx;
1424
1425 for (pidx = 0; pidx < perf->pcnt; pidx++) {
1426 ret = perf_setup_peer_mw(&perf->peers[pidx]);
1427 if (ret)
1428 return ret;
1429 }
1430
1431 dev_dbg(&perf->ntb->dev, "Global port index %d\n", perf->gidx);
1432
1433 return 0;
1434 }
1435
1436 static int perf_probe(struct ntb_client *client, struct ntb_dev *ntb)
1437 {
1438 struct perf_ctx *perf;
1439 int ret;
1440
1441 perf = perf_create_data(ntb);
1442 if (IS_ERR(perf))
1443 return PTR_ERR(perf);
1444
1445 ret = perf_init_peers(perf);
1446 if (ret)
1447 return ret;
1448
1449 perf_init_threads(perf);
1450
1451 ret = perf_init_service(perf);
1452 if (ret)
1453 return ret;
1454
1455 ret = perf_enable_service(perf);
1456 if (ret)
1457 return ret;
1458
1459 perf_setup_dbgfs(perf);
1460
1461 return 0;
1462 }
1463
1464 static void perf_remove(struct ntb_client *client, struct ntb_dev *ntb)
1465 {
1466 struct perf_ctx *perf = ntb->ctx;
1467
1468 perf_clear_dbgfs(perf);
1469
1470 perf_disable_service(perf);
1471
1472 perf_clear_threads(perf);
1473 }
1474
1475 static struct ntb_client perf_client = {
1476 .ops = {
1477 .probe = perf_probe,
1478 .remove = perf_remove
1479 }
1480 };
1481
1482 static int __init perf_init(void)
1483 {
1484 int ret;
1485
1486 if (chunk_order > MAX_CHUNK_ORDER) {
1487 chunk_order = MAX_CHUNK_ORDER;
1488 pr_info("Chunk order reduced to %hhu\n", chunk_order);
1489 }
1490
1491 if (total_order < chunk_order) {
1492 total_order = chunk_order;
1493 pr_info("Total data order reduced to %hhu\n", total_order);
1494 }
1495
1496 perf_wq = alloc_workqueue("perf_wq", WQ_UNBOUND | WQ_SYSFS, 0);
1497 if (!perf_wq)
1498 return -ENOMEM;
1499
1500 if (debugfs_initialized())
1501 perf_dbgfs_topdir = debugfs_create_dir(KBUILD_MODNAME, NULL);
1502
1503 ret = ntb_register_client(&perf_client);
1504 if (ret) {
1505 debugfs_remove_recursive(perf_dbgfs_topdir);
1506 destroy_workqueue(perf_wq);
1507 }
1508
1509 return ret;
1510 }
1511 module_init(perf_init);
1512
1513 static void __exit perf_exit(void)
1514 {
1515 ntb_unregister_client(&perf_client);
1516 debugfs_remove_recursive(perf_dbgfs_topdir);
1517 destroy_workqueue(perf_wq);
1518 }
1519 module_exit(perf_exit);
1520