1 /*
2  * Copyright(c) 2015-2018 Intel Corporation.
3  *
4  * This file is provided under a dual BSD/GPLv2 license.  When using or
5  * redistributing this file, you may do so under either license.
6  *
7  * GPL LICENSE SUMMARY
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of version 2 of the GNU General Public License as
11  * published by the Free Software Foundation.
12  *
13  * This program is distributed in the hope that it will be useful, but
14  * WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * General Public License for more details.
17  *
18  * BSD LICENSE
19  *
20  * Redistribution and use in source and binary forms, with or without
21  * modification, are permitted provided that the following conditions
22  * are met:
23  *
24  *  - Redistributions of source code must retain the above copyright
25  *    notice, this list of conditions and the following disclaimer.
26  *  - Redistributions in binary form must reproduce the above copyright
27  *    notice, this list of conditions and the following disclaimer in
28  *    the documentation and/or other materials provided with the
29  *    distribution.
30  *  - Neither the name of Intel Corporation nor the names of its
31  *    contributors may be used to endorse or promote products derived
32  *    from this software without specific prior written permission.
33  *
34  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
35  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
36  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
37  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
38  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
39  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
40  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
41  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
42  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
43  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
44  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
45  *
46  */
47 #include <linux/debugfs.h>
48 #include <linux/seq_file.h>
49 #include <linux/kernel.h>
50 #include <linux/export.h>
51 #include <linux/module.h>
52 #include <linux/string.h>
53 #include <linux/types.h>
54 #include <linux/ratelimit.h>
55 #include <linux/fault-inject.h>
56 
57 #include "hfi.h"
58 #include "trace.h"
59 #include "debugfs.h"
60 #include "device.h"
61 #include "qp.h"
62 #include "sdma.h"
63 #include "fault.h"
64 
65 static struct dentry *hfi1_dbg_root;
66 
67 /* wrappers to enforce srcu in seq file */
68 ssize_t hfi1_seq_read(struct file *file, char __user *buf, size_t size,
69 		      loff_t *ppos)
70 {
71 	struct dentry *d = file->f_path.dentry;
72 	ssize_t r;
73 
74 	r = debugfs_file_get(d);
75 	if (unlikely(r))
76 		return r;
77 	r = seq_read(file, buf, size, ppos);
78 	debugfs_file_put(d);
79 	return r;
80 }
81 
82 loff_t hfi1_seq_lseek(struct file *file, loff_t offset, int whence)
83 {
84 	struct dentry *d = file->f_path.dentry;
85 	loff_t r;
86 
87 	r = debugfs_file_get(d);
88 	if (unlikely(r))
89 		return r;
90 	r = seq_lseek(file, offset, whence);
91 	debugfs_file_put(d);
92 	return r;
93 }
94 
95 #define private2dd(file) (file_inode(file)->i_private)
96 #define private2ppd(file) (file_inode(file)->i_private)
97 
98 static void *_opcode_stats_seq_start(struct seq_file *s, loff_t *pos)
99 {
100 	struct hfi1_opcode_stats_perctx *opstats;
101 
102 	if (*pos >= ARRAY_SIZE(opstats->stats))
103 		return NULL;
104 	return pos;
105 }
106 
107 static void *_opcode_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
108 {
109 	struct hfi1_opcode_stats_perctx *opstats;
110 
111 	++*pos;
112 	if (*pos >= ARRAY_SIZE(opstats->stats))
113 		return NULL;
114 	return pos;
115 }
116 
117 static void _opcode_stats_seq_stop(struct seq_file *s, void *v)
118 {
119 }
120 
121 static int opcode_stats_show(struct seq_file *s, u8 i, u64 packets, u64 bytes)
122 {
123 	if (!packets && !bytes)
124 		return SEQ_SKIP;
125 	seq_printf(s, "%02x %llu/%llu\n", i,
126 		   (unsigned long long)packets,
127 		   (unsigned long long)bytes);
128 
129 	return 0;
130 }
131 
132 static int _opcode_stats_seq_show(struct seq_file *s, void *v)
133 {
134 	loff_t *spos = v;
135 	loff_t i = *spos, j;
136 	u64 n_packets = 0, n_bytes = 0;
137 	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
138 	struct hfi1_devdata *dd = dd_from_dev(ibd);
139 	struct hfi1_ctxtdata *rcd;
140 
141 	for (j = 0; j < dd->first_dyn_alloc_ctxt; j++) {
142 		rcd = hfi1_rcd_get_by_index(dd, j);
143 		if (rcd) {
144 			n_packets += rcd->opstats->stats[i].n_packets;
145 			n_bytes += rcd->opstats->stats[i].n_bytes;
146 		}
147 		hfi1_rcd_put(rcd);
148 	}
149 	return opcode_stats_show(s, i, n_packets, n_bytes);
150 }
151 
152 DEBUGFS_SEQ_FILE_OPS(opcode_stats);
153 DEBUGFS_SEQ_FILE_OPEN(opcode_stats)
154 DEBUGFS_FILE_OPS(opcode_stats);
155 
156 static void *_tx_opcode_stats_seq_start(struct seq_file *s, loff_t *pos)
157 {
158 	return _opcode_stats_seq_start(s, pos);
159 }
160 
161 static void *_tx_opcode_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
162 {
163 	return _opcode_stats_seq_next(s, v, pos);
164 }
165 
166 static void _tx_opcode_stats_seq_stop(struct seq_file *s, void *v)
167 {
168 }
169 
170 static int _tx_opcode_stats_seq_show(struct seq_file *s, void *v)
171 {
172 	loff_t *spos = v;
173 	loff_t i = *spos;
174 	int j;
175 	u64 n_packets = 0, n_bytes = 0;
176 	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
177 	struct hfi1_devdata *dd = dd_from_dev(ibd);
178 
179 	for_each_possible_cpu(j) {
180 		struct hfi1_opcode_stats_perctx *s =
181 			per_cpu_ptr(dd->tx_opstats, j);
182 		n_packets += s->stats[i].n_packets;
183 		n_bytes += s->stats[i].n_bytes;
184 	}
185 	return opcode_stats_show(s, i, n_packets, n_bytes);
186 }
187 
188 DEBUGFS_SEQ_FILE_OPS(tx_opcode_stats);
189 DEBUGFS_SEQ_FILE_OPEN(tx_opcode_stats)
190 DEBUGFS_FILE_OPS(tx_opcode_stats);
191 
192 static void *_ctx_stats_seq_start(struct seq_file *s, loff_t *pos)
193 {
194 	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
195 	struct hfi1_devdata *dd = dd_from_dev(ibd);
196 
197 	if (!*pos)
198 		return SEQ_START_TOKEN;
199 	if (*pos >= dd->first_dyn_alloc_ctxt)
200 		return NULL;
201 	return pos;
202 }
203 
204 static void *_ctx_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
205 {
206 	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
207 	struct hfi1_devdata *dd = dd_from_dev(ibd);
208 
209 	if (v == SEQ_START_TOKEN)
210 		return pos;
211 
212 	++*pos;
213 	if (*pos >= dd->first_dyn_alloc_ctxt)
214 		return NULL;
215 	return pos;
216 }
217 
218 static void _ctx_stats_seq_stop(struct seq_file *s, void *v)
219 {
220 	/* nothing allocated */
221 }
222 
223 static int _ctx_stats_seq_show(struct seq_file *s, void *v)
224 {
225 	loff_t *spos;
226 	loff_t i, j;
227 	u64 n_packets = 0;
228 	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
229 	struct hfi1_devdata *dd = dd_from_dev(ibd);
230 	struct hfi1_ctxtdata *rcd;
231 
232 	if (v == SEQ_START_TOKEN) {
233 		seq_puts(s, "Ctx:npkts\n");
234 		return 0;
235 	}
236 
237 	spos = v;
238 	i = *spos;
239 
240 	rcd = hfi1_rcd_get_by_index_safe(dd, i);
241 	if (!rcd)
242 		return SEQ_SKIP;
243 
244 	for (j = 0; j < ARRAY_SIZE(rcd->opstats->stats); j++)
245 		n_packets += rcd->opstats->stats[j].n_packets;
246 
247 	hfi1_rcd_put(rcd);
248 
249 	if (!n_packets)
250 		return SEQ_SKIP;
251 
252 	seq_printf(s, "  %llu:%llu\n", i, n_packets);
253 	return 0;
254 }
255 
256 DEBUGFS_SEQ_FILE_OPS(ctx_stats);
257 DEBUGFS_SEQ_FILE_OPEN(ctx_stats)
258 DEBUGFS_FILE_OPS(ctx_stats);
259 
260 static void *_qp_stats_seq_start(struct seq_file *s, loff_t *pos)
261 	__acquires(RCU)
262 {
263 	struct rvt_qp_iter *iter;
264 	loff_t n = *pos;
265 
266 	iter = rvt_qp_iter_init(s->private, 0, NULL);
267 
268 	/* stop calls rcu_read_unlock */
269 	rcu_read_lock();
270 
271 	if (!iter)
272 		return NULL;
273 
274 	do {
275 		if (rvt_qp_iter_next(iter)) {
276 			kfree(iter);
277 			return NULL;
278 		}
279 	} while (n--);
280 
281 	return iter;
282 }
283 
284 static void *_qp_stats_seq_next(struct seq_file *s, void *iter_ptr,
285 				loff_t *pos)
286 	__must_hold(RCU)
287 {
288 	struct rvt_qp_iter *iter = iter_ptr;
289 
290 	(*pos)++;
291 
292 	if (rvt_qp_iter_next(iter)) {
293 		kfree(iter);
294 		return NULL;
295 	}
296 
297 	return iter;
298 }
299 
300 static void _qp_stats_seq_stop(struct seq_file *s, void *iter_ptr)
301 	__releases(RCU)
302 {
303 	rcu_read_unlock();
304 }
305 
306 static int _qp_stats_seq_show(struct seq_file *s, void *iter_ptr)
307 {
308 	struct rvt_qp_iter *iter = iter_ptr;
309 
310 	if (!iter)
311 		return 0;
312 
313 	qp_iter_print(s, iter);
314 
315 	return 0;
316 }
317 
318 DEBUGFS_SEQ_FILE_OPS(qp_stats);
319 DEBUGFS_SEQ_FILE_OPEN(qp_stats)
320 DEBUGFS_FILE_OPS(qp_stats);
321 
322 static void *_sdes_seq_start(struct seq_file *s, loff_t *pos)
323 {
324 	struct hfi1_ibdev *ibd;
325 	struct hfi1_devdata *dd;
326 
327 	ibd = (struct hfi1_ibdev *)s->private;
328 	dd = dd_from_dev(ibd);
329 	if (!dd->per_sdma || *pos >= dd->num_sdma)
330 		return NULL;
331 	return pos;
332 }
333 
334 static void *_sdes_seq_next(struct seq_file *s, void *v, loff_t *pos)
335 {
336 	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
337 	struct hfi1_devdata *dd = dd_from_dev(ibd);
338 
339 	++*pos;
340 	if (!dd->per_sdma || *pos >= dd->num_sdma)
341 		return NULL;
342 	return pos;
343 }
344 
345 static void _sdes_seq_stop(struct seq_file *s, void *v)
346 {
347 }
348 
349 static int _sdes_seq_show(struct seq_file *s, void *v)
350 {
351 	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
352 	struct hfi1_devdata *dd = dd_from_dev(ibd);
353 	loff_t *spos = v;
354 	loff_t i = *spos;
355 
356 	sdma_seqfile_dump_sde(s, &dd->per_sdma[i]);
357 	return 0;
358 }
359 
360 DEBUGFS_SEQ_FILE_OPS(sdes);
361 DEBUGFS_SEQ_FILE_OPEN(sdes)
362 DEBUGFS_FILE_OPS(sdes);
363 
364 static void *_rcds_seq_start(struct seq_file *s, loff_t *pos)
365 {
366 	struct hfi1_ibdev *ibd;
367 	struct hfi1_devdata *dd;
368 
369 	ibd = (struct hfi1_ibdev *)s->private;
370 	dd = dd_from_dev(ibd);
371 	if (!dd->rcd || *pos >= dd->n_krcv_queues)
372 		return NULL;
373 	return pos;
374 }
375 
376 static void *_rcds_seq_next(struct seq_file *s, void *v, loff_t *pos)
377 {
378 	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
379 	struct hfi1_devdata *dd = dd_from_dev(ibd);
380 
381 	++*pos;
382 	if (!dd->rcd || *pos >= dd->num_rcv_contexts)
383 		return NULL;
384 	return pos;
385 }
386 
387 static void _rcds_seq_stop(struct seq_file *s, void *v)
388 {
389 }
390 
391 static int _rcds_seq_show(struct seq_file *s, void *v)
392 {
393 	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
394 	struct hfi1_devdata *dd = dd_from_dev(ibd);
395 	struct hfi1_ctxtdata *rcd;
396 	loff_t *spos = v;
397 	loff_t i = *spos;
398 
399 	rcd = hfi1_rcd_get_by_index_safe(dd, i);
400 	if (rcd)
401 		seqfile_dump_rcd(s, rcd);
402 	hfi1_rcd_put(rcd);
403 	return 0;
404 }
405 
406 DEBUGFS_SEQ_FILE_OPS(rcds);
407 DEBUGFS_SEQ_FILE_OPEN(rcds)
408 DEBUGFS_FILE_OPS(rcds);
409 
410 static void *_pios_seq_start(struct seq_file *s, loff_t *pos)
411 {
412 	struct hfi1_ibdev *ibd;
413 	struct hfi1_devdata *dd;
414 
415 	ibd = (struct hfi1_ibdev *)s->private;
416 	dd = dd_from_dev(ibd);
417 	if (!dd->send_contexts || *pos >= dd->num_send_contexts)
418 		return NULL;
419 	return pos;
420 }
421 
422 static void *_pios_seq_next(struct seq_file *s, void *v, loff_t *pos)
423 {
424 	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
425 	struct hfi1_devdata *dd = dd_from_dev(ibd);
426 
427 	++*pos;
428 	if (!dd->send_contexts || *pos >= dd->num_send_contexts)
429 		return NULL;
430 	return pos;
431 }
432 
433 static void _pios_seq_stop(struct seq_file *s, void *v)
434 {
435 }
436 
437 static int _pios_seq_show(struct seq_file *s, void *v)
438 {
439 	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
440 	struct hfi1_devdata *dd = dd_from_dev(ibd);
441 	struct send_context_info *sci;
442 	loff_t *spos = v;
443 	loff_t i = *spos;
444 	unsigned long flags;
445 
446 	spin_lock_irqsave(&dd->sc_lock, flags);
447 	sci = &dd->send_contexts[i];
448 	if (sci && sci->type != SC_USER && sci->allocated && sci->sc)
449 		seqfile_dump_sci(s, i, sci);
450 	spin_unlock_irqrestore(&dd->sc_lock, flags);
451 	return 0;
452 }
453 
454 DEBUGFS_SEQ_FILE_OPS(pios);
455 DEBUGFS_SEQ_FILE_OPEN(pios)
456 DEBUGFS_FILE_OPS(pios);
457 
458 /* read the per-device counters */
459 static ssize_t dev_counters_read(struct file *file, char __user *buf,
460 				 size_t count, loff_t *ppos)
461 {
462 	u64 *counters;
463 	size_t avail;
464 	struct hfi1_devdata *dd;
465 	ssize_t rval;
466 
467 	dd = private2dd(file);
468 	avail = hfi1_read_cntrs(dd, NULL, &counters);
469 	rval =  simple_read_from_buffer(buf, count, ppos, counters, avail);
470 	return rval;
471 }
472 
473 /* read the per-device counters */
474 static ssize_t dev_names_read(struct file *file, char __user *buf,
475 			      size_t count, loff_t *ppos)
476 {
477 	char *names;
478 	size_t avail;
479 	struct hfi1_devdata *dd;
480 	ssize_t rval;
481 
482 	dd = private2dd(file);
483 	avail = hfi1_read_cntrs(dd, &names, NULL);
484 	rval =  simple_read_from_buffer(buf, count, ppos, names, avail);
485 	return rval;
486 }
487 
488 struct counter_info {
489 	char *name;
490 	const struct file_operations ops;
491 };
492 
493 /*
494  * Could use file_inode(file)->i_ino to figure out which file,
495  * instead of separate routine for each, but for now, this works...
496  */
497 
498 /* read the per-port names (same for each port) */
499 static ssize_t portnames_read(struct file *file, char __user *buf,
500 			      size_t count, loff_t *ppos)
501 {
502 	char *names;
503 	size_t avail;
504 	struct hfi1_devdata *dd;
505 	ssize_t rval;
506 
507 	dd = private2dd(file);
508 	avail = hfi1_read_portcntrs(dd->pport, &names, NULL);
509 	rval = simple_read_from_buffer(buf, count, ppos, names, avail);
510 	return rval;
511 }
512 
513 /* read the per-port counters */
514 static ssize_t portcntrs_debugfs_read(struct file *file, char __user *buf,
515 				      size_t count, loff_t *ppos)
516 {
517 	u64 *counters;
518 	size_t avail;
519 	struct hfi1_pportdata *ppd;
520 	ssize_t rval;
521 
522 	ppd = private2ppd(file);
523 	avail = hfi1_read_portcntrs(ppd, NULL, &counters);
524 	rval = simple_read_from_buffer(buf, count, ppos, counters, avail);
525 	return rval;
526 }
527 
528 static void check_dyn_flag(u64 scratch0, char *p, int size, int *used,
529 			   int this_hfi, int hfi, u32 flag, const char *what)
530 {
531 	u32 mask;
532 
533 	mask = flag << (hfi ? CR_DYN_SHIFT : 0);
534 	if (scratch0 & mask) {
535 		*used += scnprintf(p + *used, size - *used,
536 				   "  0x%08x - HFI%d %s in use, %s device\n",
537 				   mask, hfi, what,
538 				   this_hfi == hfi ? "this" : "other");
539 	}
540 }
541 
542 static ssize_t asic_flags_read(struct file *file, char __user *buf,
543 			       size_t count, loff_t *ppos)
544 {
545 	struct hfi1_pportdata *ppd;
546 	struct hfi1_devdata *dd;
547 	u64 scratch0;
548 	char *tmp;
549 	int ret = 0;
550 	int size;
551 	int used;
552 	int i;
553 
554 	ppd = private2ppd(file);
555 	dd = ppd->dd;
556 	size = PAGE_SIZE;
557 	used = 0;
558 	tmp = kmalloc(size, GFP_KERNEL);
559 	if (!tmp)
560 		return -ENOMEM;
561 
562 	scratch0 = read_csr(dd, ASIC_CFG_SCRATCH);
563 	used += scnprintf(tmp + used, size - used,
564 			  "Resource flags: 0x%016llx\n", scratch0);
565 
566 	/* check permanent flag */
567 	if (scratch0 & CR_THERM_INIT) {
568 		used += scnprintf(tmp + used, size - used,
569 				  "  0x%08x - thermal monitoring initialized\n",
570 				  (u32)CR_THERM_INIT);
571 	}
572 
573 	/* check each dynamic flag on each HFI */
574 	for (i = 0; i < 2; i++) {
575 		check_dyn_flag(scratch0, tmp, size, &used, dd->hfi1_id, i,
576 			       CR_SBUS, "SBus");
577 		check_dyn_flag(scratch0, tmp, size, &used, dd->hfi1_id, i,
578 			       CR_EPROM, "EPROM");
579 		check_dyn_flag(scratch0, tmp, size, &used, dd->hfi1_id, i,
580 			       CR_I2C1, "i2c chain 1");
581 		check_dyn_flag(scratch0, tmp, size, &used, dd->hfi1_id, i,
582 			       CR_I2C2, "i2c chain 2");
583 	}
584 	used += scnprintf(tmp + used, size - used, "Write bits to clear\n");
585 
586 	ret = simple_read_from_buffer(buf, count, ppos, tmp, used);
587 	kfree(tmp);
588 	return ret;
589 }
590 
591 static ssize_t asic_flags_write(struct file *file, const char __user *buf,
592 				size_t count, loff_t *ppos)
593 {
594 	struct hfi1_pportdata *ppd;
595 	struct hfi1_devdata *dd;
596 	char *buff;
597 	int ret;
598 	unsigned long long value;
599 	u64 scratch0;
600 	u64 clear;
601 
602 	ppd = private2ppd(file);
603 	dd = ppd->dd;
604 
605 	/* zero terminate and read the expected integer */
606 	buff = memdup_user_nul(buf, count);
607 	if (IS_ERR(buff))
608 		return PTR_ERR(buff);
609 
610 	ret = kstrtoull(buff, 0, &value);
611 	if (ret)
612 		goto do_free;
613 	clear = value;
614 
615 	/* obtain exclusive access */
616 	mutex_lock(&dd->asic_data->asic_resource_mutex);
617 	acquire_hw_mutex(dd);
618 
619 	scratch0 = read_csr(dd, ASIC_CFG_SCRATCH);
620 	scratch0 &= ~clear;
621 	write_csr(dd, ASIC_CFG_SCRATCH, scratch0);
622 	/* force write to be visible to other HFI on another OS */
623 	(void)read_csr(dd, ASIC_CFG_SCRATCH);
624 
625 	release_hw_mutex(dd);
626 	mutex_unlock(&dd->asic_data->asic_resource_mutex);
627 
628 	/* return the number of bytes written */
629 	ret = count;
630 
631  do_free:
632 	kfree(buff);
633 	return ret;
634 }
635 
636 /* read the dc8051 memory */
637 static ssize_t dc8051_memory_read(struct file *file, char __user *buf,
638 				  size_t count, loff_t *ppos)
639 {
640 	struct hfi1_pportdata *ppd = private2ppd(file);
641 	ssize_t rval;
642 	void *tmp;
643 	loff_t start, end;
644 
645 	/* the checks below expect the position to be positive */
646 	if (*ppos < 0)
647 		return -EINVAL;
648 
649 	tmp = kzalloc(DC8051_DATA_MEM_SIZE, GFP_KERNEL);
650 	if (!tmp)
651 		return -ENOMEM;
652 
653 	/*
654 	 * Fill in the requested portion of the temporary buffer from the
655 	 * 8051 memory.  The 8051 memory read is done in terms of 8 bytes.
656 	 * Adjust start and end to fit.  Skip reading anything if out of
657 	 * range.
658 	 */
659 	start = *ppos & ~0x7;	/* round down */
660 	if (start < DC8051_DATA_MEM_SIZE) {
661 		end = (*ppos + count + 7) & ~0x7; /* round up */
662 		if (end > DC8051_DATA_MEM_SIZE)
663 			end = DC8051_DATA_MEM_SIZE;
664 		rval = read_8051_data(ppd->dd, start, end - start,
665 				      (u64 *)(tmp + start));
666 		if (rval)
667 			goto done;
668 	}
669 
670 	rval = simple_read_from_buffer(buf, count, ppos, tmp,
671 				       DC8051_DATA_MEM_SIZE);
672 done:
673 	kfree(tmp);
674 	return rval;
675 }
676 
677 static ssize_t debugfs_lcb_read(struct file *file, char __user *buf,
678 				size_t count, loff_t *ppos)
679 {
680 	struct hfi1_pportdata *ppd = private2ppd(file);
681 	struct hfi1_devdata *dd = ppd->dd;
682 	unsigned long total, csr_off;
683 	u64 data;
684 
685 	if (*ppos < 0)
686 		return -EINVAL;
687 	/* only read 8 byte quantities */
688 	if ((count % 8) != 0)
689 		return -EINVAL;
690 	/* offset must be 8-byte aligned */
691 	if ((*ppos % 8) != 0)
692 		return -EINVAL;
693 	/* do nothing if out of range or zero count */
694 	if (*ppos >= (LCB_END - LCB_START) || !count)
695 		return 0;
696 	/* reduce count if needed */
697 	if (*ppos + count > LCB_END - LCB_START)
698 		count = (LCB_END - LCB_START) - *ppos;
699 
700 	csr_off = LCB_START + *ppos;
701 	for (total = 0; total < count; total += 8, csr_off += 8) {
702 		if (read_lcb_csr(dd, csr_off, (u64 *)&data))
703 			break; /* failed */
704 		if (put_user(data, (unsigned long __user *)(buf + total)))
705 			break;
706 	}
707 	*ppos += total;
708 	return total;
709 }
710 
711 static ssize_t debugfs_lcb_write(struct file *file, const char __user *buf,
712 				 size_t count, loff_t *ppos)
713 {
714 	struct hfi1_pportdata *ppd = private2ppd(file);
715 	struct hfi1_devdata *dd = ppd->dd;
716 	unsigned long total, csr_off, data;
717 
718 	if (*ppos < 0)
719 		return -EINVAL;
720 	/* only write 8 byte quantities */
721 	if ((count % 8) != 0)
722 		return -EINVAL;
723 	/* offset must be 8-byte aligned */
724 	if ((*ppos % 8) != 0)
725 		return -EINVAL;
726 	/* do nothing if out of range or zero count */
727 	if (*ppos >= (LCB_END - LCB_START) || !count)
728 		return 0;
729 	/* reduce count if needed */
730 	if (*ppos + count > LCB_END - LCB_START)
731 		count = (LCB_END - LCB_START) - *ppos;
732 
733 	csr_off = LCB_START + *ppos;
734 	for (total = 0; total < count; total += 8, csr_off += 8) {
735 		if (get_user(data, (unsigned long __user *)(buf + total)))
736 			break;
737 		if (write_lcb_csr(dd, csr_off, data))
738 			break; /* failed */
739 	}
740 	*ppos += total;
741 	return total;
742 }
743 
744 /*
745  * read the per-port QSFP data for ppd
746  */
747 static ssize_t qsfp_debugfs_dump(struct file *file, char __user *buf,
748 				 size_t count, loff_t *ppos)
749 {
750 	struct hfi1_pportdata *ppd;
751 	char *tmp;
752 	int ret;
753 
754 	ppd = private2ppd(file);
755 	tmp = kmalloc(PAGE_SIZE, GFP_KERNEL);
756 	if (!tmp)
757 		return -ENOMEM;
758 
759 	ret = qsfp_dump(ppd, tmp, PAGE_SIZE);
760 	if (ret > 0)
761 		ret = simple_read_from_buffer(buf, count, ppos, tmp, ret);
762 	kfree(tmp);
763 	return ret;
764 }
765 
766 /* Do an i2c write operation on the chain for the given HFI. */
767 static ssize_t __i2c_debugfs_write(struct file *file, const char __user *buf,
768 				   size_t count, loff_t *ppos, u32 target)
769 {
770 	struct hfi1_pportdata *ppd;
771 	char *buff;
772 	int ret;
773 	int i2c_addr;
774 	int offset;
775 	int total_written;
776 
777 	ppd = private2ppd(file);
778 
779 	/* byte offset format: [offsetSize][i2cAddr][offsetHigh][offsetLow] */
780 	i2c_addr = (*ppos >> 16) & 0xffff;
781 	offset = *ppos & 0xffff;
782 
783 	/* explicitly reject invalid address 0 to catch cp and cat */
784 	if (i2c_addr == 0)
785 		return -EINVAL;
786 
787 	buff = memdup_user(buf, count);
788 	if (IS_ERR(buff))
789 		return PTR_ERR(buff);
790 
791 	total_written = i2c_write(ppd, target, i2c_addr, offset, buff, count);
792 	if (total_written < 0) {
793 		ret = total_written;
794 		goto _free;
795 	}
796 
797 	*ppos += total_written;
798 
799 	ret = total_written;
800 
801  _free:
802 	kfree(buff);
803 	return ret;
804 }
805 
806 /* Do an i2c write operation on chain for HFI 0. */
807 static ssize_t i2c1_debugfs_write(struct file *file, const char __user *buf,
808 				  size_t count, loff_t *ppos)
809 {
810 	return __i2c_debugfs_write(file, buf, count, ppos, 0);
811 }
812 
813 /* Do an i2c write operation on chain for HFI 1. */
814 static ssize_t i2c2_debugfs_write(struct file *file, const char __user *buf,
815 				  size_t count, loff_t *ppos)
816 {
817 	return __i2c_debugfs_write(file, buf, count, ppos, 1);
818 }
819 
820 /* Do an i2c read operation on the chain for the given HFI. */
821 static ssize_t __i2c_debugfs_read(struct file *file, char __user *buf,
822 				  size_t count, loff_t *ppos, u32 target)
823 {
824 	struct hfi1_pportdata *ppd;
825 	char *buff;
826 	int ret;
827 	int i2c_addr;
828 	int offset;
829 	int total_read;
830 
831 	ppd = private2ppd(file);
832 
833 	/* byte offset format: [offsetSize][i2cAddr][offsetHigh][offsetLow] */
834 	i2c_addr = (*ppos >> 16) & 0xffff;
835 	offset = *ppos & 0xffff;
836 
837 	/* explicitly reject invalid address 0 to catch cp and cat */
838 	if (i2c_addr == 0)
839 		return -EINVAL;
840 
841 	buff = kmalloc(count, GFP_KERNEL);
842 	if (!buff)
843 		return -ENOMEM;
844 
845 	total_read = i2c_read(ppd, target, i2c_addr, offset, buff, count);
846 	if (total_read < 0) {
847 		ret = total_read;
848 		goto _free;
849 	}
850 
851 	*ppos += total_read;
852 
853 	ret = copy_to_user(buf, buff, total_read);
854 	if (ret > 0) {
855 		ret = -EFAULT;
856 		goto _free;
857 	}
858 
859 	ret = total_read;
860 
861  _free:
862 	kfree(buff);
863 	return ret;
864 }
865 
866 /* Do an i2c read operation on chain for HFI 0. */
867 static ssize_t i2c1_debugfs_read(struct file *file, char __user *buf,
868 				 size_t count, loff_t *ppos)
869 {
870 	return __i2c_debugfs_read(file, buf, count, ppos, 0);
871 }
872 
873 /* Do an i2c read operation on chain for HFI 1. */
874 static ssize_t i2c2_debugfs_read(struct file *file, char __user *buf,
875 				 size_t count, loff_t *ppos)
876 {
877 	return __i2c_debugfs_read(file, buf, count, ppos, 1);
878 }
879 
880 /* Do a QSFP write operation on the i2c chain for the given HFI. */
881 static ssize_t __qsfp_debugfs_write(struct file *file, const char __user *buf,
882 				    size_t count, loff_t *ppos, u32 target)
883 {
884 	struct hfi1_pportdata *ppd;
885 	char *buff;
886 	int ret;
887 	int total_written;
888 
889 	if (*ppos + count > QSFP_PAGESIZE * 4) /* base page + page00-page03 */
890 		return -EINVAL;
891 
892 	ppd = private2ppd(file);
893 
894 	buff = memdup_user(buf, count);
895 	if (IS_ERR(buff))
896 		return PTR_ERR(buff);
897 
898 	total_written = qsfp_write(ppd, target, *ppos, buff, count);
899 	if (total_written < 0) {
900 		ret = total_written;
901 		goto _free;
902 	}
903 
904 	*ppos += total_written;
905 
906 	ret = total_written;
907 
908  _free:
909 	kfree(buff);
910 	return ret;
911 }
912 
913 /* Do a QSFP write operation on i2c chain for HFI 0. */
914 static ssize_t qsfp1_debugfs_write(struct file *file, const char __user *buf,
915 				   size_t count, loff_t *ppos)
916 {
917 	return __qsfp_debugfs_write(file, buf, count, ppos, 0);
918 }
919 
920 /* Do a QSFP write operation on i2c chain for HFI 1. */
921 static ssize_t qsfp2_debugfs_write(struct file *file, const char __user *buf,
922 				   size_t count, loff_t *ppos)
923 {
924 	return __qsfp_debugfs_write(file, buf, count, ppos, 1);
925 }
926 
927 /* Do a QSFP read operation on the i2c chain for the given HFI. */
928 static ssize_t __qsfp_debugfs_read(struct file *file, char __user *buf,
929 				   size_t count, loff_t *ppos, u32 target)
930 {
931 	struct hfi1_pportdata *ppd;
932 	char *buff;
933 	int ret;
934 	int total_read;
935 
936 	if (*ppos + count > QSFP_PAGESIZE * 4) { /* base page + page00-page03 */
937 		ret = -EINVAL;
938 		goto _return;
939 	}
940 
941 	ppd = private2ppd(file);
942 
943 	buff = kmalloc(count, GFP_KERNEL);
944 	if (!buff) {
945 		ret = -ENOMEM;
946 		goto _return;
947 	}
948 
949 	total_read = qsfp_read(ppd, target, *ppos, buff, count);
950 	if (total_read < 0) {
951 		ret = total_read;
952 		goto _free;
953 	}
954 
955 	*ppos += total_read;
956 
957 	ret = copy_to_user(buf, buff, total_read);
958 	if (ret > 0) {
959 		ret = -EFAULT;
960 		goto _free;
961 	}
962 
963 	ret = total_read;
964 
965  _free:
966 	kfree(buff);
967  _return:
968 	return ret;
969 }
970 
971 /* Do a QSFP read operation on i2c chain for HFI 0. */
972 static ssize_t qsfp1_debugfs_read(struct file *file, char __user *buf,
973 				  size_t count, loff_t *ppos)
974 {
975 	return __qsfp_debugfs_read(file, buf, count, ppos, 0);
976 }
977 
978 /* Do a QSFP read operation on i2c chain for HFI 1. */
979 static ssize_t qsfp2_debugfs_read(struct file *file, char __user *buf,
980 				  size_t count, loff_t *ppos)
981 {
982 	return __qsfp_debugfs_read(file, buf, count, ppos, 1);
983 }
984 
985 static int __i2c_debugfs_open(struct inode *in, struct file *fp, u32 target)
986 {
987 	struct hfi1_pportdata *ppd;
988 
989 	ppd = private2ppd(fp);
990 
991 	return acquire_chip_resource(ppd->dd, i2c_target(target), 0);
992 }
993 
994 static int i2c1_debugfs_open(struct inode *in, struct file *fp)
995 {
996 	return __i2c_debugfs_open(in, fp, 0);
997 }
998 
999 static int i2c2_debugfs_open(struct inode *in, struct file *fp)
1000 {
1001 	return __i2c_debugfs_open(in, fp, 1);
1002 }
1003 
1004 static int __i2c_debugfs_release(struct inode *in, struct file *fp, u32 target)
1005 {
1006 	struct hfi1_pportdata *ppd;
1007 
1008 	ppd = private2ppd(fp);
1009 
1010 	release_chip_resource(ppd->dd, i2c_target(target));
1011 
1012 	return 0;
1013 }
1014 
1015 static int i2c1_debugfs_release(struct inode *in, struct file *fp)
1016 {
1017 	return __i2c_debugfs_release(in, fp, 0);
1018 }
1019 
1020 static int i2c2_debugfs_release(struct inode *in, struct file *fp)
1021 {
1022 	return __i2c_debugfs_release(in, fp, 1);
1023 }
1024 
1025 static int __qsfp_debugfs_open(struct inode *in, struct file *fp, u32 target)
1026 {
1027 	struct hfi1_pportdata *ppd;
1028 
1029 	ppd = private2ppd(fp);
1030 
1031 	return acquire_chip_resource(ppd->dd, i2c_target(target), 0);
1032 }
1033 
1034 static int qsfp1_debugfs_open(struct inode *in, struct file *fp)
1035 {
1036 	return __qsfp_debugfs_open(in, fp, 0);
1037 }
1038 
1039 static int qsfp2_debugfs_open(struct inode *in, struct file *fp)
1040 {
1041 	return __qsfp_debugfs_open(in, fp, 1);
1042 }
1043 
1044 static int __qsfp_debugfs_release(struct inode *in, struct file *fp, u32 target)
1045 {
1046 	struct hfi1_pportdata *ppd;
1047 
1048 	ppd = private2ppd(fp);
1049 
1050 	release_chip_resource(ppd->dd, i2c_target(target));
1051 
1052 	return 0;
1053 }
1054 
1055 static int qsfp1_debugfs_release(struct inode *in, struct file *fp)
1056 {
1057 	return __qsfp_debugfs_release(in, fp, 0);
1058 }
1059 
1060 static int qsfp2_debugfs_release(struct inode *in, struct file *fp)
1061 {
1062 	return __qsfp_debugfs_release(in, fp, 1);
1063 }
1064 
1065 #define EXPROM_WRITE_ENABLE BIT_ULL(14)
1066 
1067 static bool exprom_wp_disabled;
1068 
1069 static int exprom_wp_set(struct hfi1_devdata *dd, bool disable)
1070 {
1071 	u64 gpio_val = 0;
1072 
1073 	if (disable) {
1074 		gpio_val = EXPROM_WRITE_ENABLE;
1075 		exprom_wp_disabled = true;
1076 		dd_dev_info(dd, "Disable Expansion ROM Write Protection\n");
1077 	} else {
1078 		exprom_wp_disabled = false;
1079 		dd_dev_info(dd, "Enable Expansion ROM Write Protection\n");
1080 	}
1081 
1082 	write_csr(dd, ASIC_GPIO_OUT, gpio_val);
1083 	write_csr(dd, ASIC_GPIO_OE, gpio_val);
1084 
1085 	return 0;
1086 }
1087 
1088 static ssize_t exprom_wp_debugfs_read(struct file *file, char __user *buf,
1089 				      size_t count, loff_t *ppos)
1090 {
1091 	return 0;
1092 }
1093 
1094 static ssize_t exprom_wp_debugfs_write(struct file *file,
1095 				       const char __user *buf, size_t count,
1096 				       loff_t *ppos)
1097 {
1098 	struct hfi1_pportdata *ppd = private2ppd(file);
1099 	char cdata;
1100 
1101 	if (count != 1)
1102 		return -EINVAL;
1103 	if (get_user(cdata, buf))
1104 		return -EFAULT;
1105 	if (cdata == '0')
1106 		exprom_wp_set(ppd->dd, false);
1107 	else if (cdata == '1')
1108 		exprom_wp_set(ppd->dd, true);
1109 	else
1110 		return -EINVAL;
1111 
1112 	return 1;
1113 }
1114 
1115 static unsigned long exprom_in_use;
1116 
1117 static int exprom_wp_debugfs_open(struct inode *in, struct file *fp)
1118 {
1119 	if (test_and_set_bit(0, &exprom_in_use))
1120 		return -EBUSY;
1121 
1122 	return 0;
1123 }
1124 
1125 static int exprom_wp_debugfs_release(struct inode *in, struct file *fp)
1126 {
1127 	struct hfi1_pportdata *ppd = private2ppd(fp);
1128 
1129 	if (exprom_wp_disabled)
1130 		exprom_wp_set(ppd->dd, false);
1131 	clear_bit(0, &exprom_in_use);
1132 
1133 	return 0;
1134 }
1135 
1136 #define DEBUGFS_OPS(nm, readroutine, writeroutine)	\
1137 { \
1138 	.name = nm, \
1139 	.ops = { \
1140 		.owner = THIS_MODULE, \
1141 		.read = readroutine, \
1142 		.write = writeroutine, \
1143 		.llseek = generic_file_llseek, \
1144 	}, \
1145 }
1146 
1147 #define DEBUGFS_XOPS(nm, readf, writef, openf, releasef) \
1148 { \
1149 	.name = nm, \
1150 	.ops = { \
1151 		.owner = THIS_MODULE, \
1152 		.read = readf, \
1153 		.write = writef, \
1154 		.llseek = generic_file_llseek, \
1155 		.open = openf, \
1156 		.release = releasef \
1157 	}, \
1158 }
1159 
1160 static const struct counter_info cntr_ops[] = {
1161 	DEBUGFS_OPS("counter_names", dev_names_read, NULL),
1162 	DEBUGFS_OPS("counters", dev_counters_read, NULL),
1163 	DEBUGFS_OPS("portcounter_names", portnames_read, NULL),
1164 };
1165 
1166 static const struct counter_info port_cntr_ops[] = {
1167 	DEBUGFS_OPS("port%dcounters", portcntrs_debugfs_read, NULL),
1168 	DEBUGFS_XOPS("i2c1", i2c1_debugfs_read, i2c1_debugfs_write,
1169 		     i2c1_debugfs_open, i2c1_debugfs_release),
1170 	DEBUGFS_XOPS("i2c2", i2c2_debugfs_read, i2c2_debugfs_write,
1171 		     i2c2_debugfs_open, i2c2_debugfs_release),
1172 	DEBUGFS_OPS("qsfp_dump%d", qsfp_debugfs_dump, NULL),
1173 	DEBUGFS_XOPS("qsfp1", qsfp1_debugfs_read, qsfp1_debugfs_write,
1174 		     qsfp1_debugfs_open, qsfp1_debugfs_release),
1175 	DEBUGFS_XOPS("qsfp2", qsfp2_debugfs_read, qsfp2_debugfs_write,
1176 		     qsfp2_debugfs_open, qsfp2_debugfs_release),
1177 	DEBUGFS_XOPS("exprom_wp", exprom_wp_debugfs_read,
1178 		     exprom_wp_debugfs_write, exprom_wp_debugfs_open,
1179 		     exprom_wp_debugfs_release),
1180 	DEBUGFS_OPS("asic_flags", asic_flags_read, asic_flags_write),
1181 	DEBUGFS_OPS("dc8051_memory", dc8051_memory_read, NULL),
1182 	DEBUGFS_OPS("lcb", debugfs_lcb_read, debugfs_lcb_write),
1183 };
1184 
1185 static void *_sdma_cpu_list_seq_start(struct seq_file *s, loff_t *pos)
1186 {
1187 	if (*pos >= num_online_cpus())
1188 		return NULL;
1189 
1190 	return pos;
1191 }
1192 
1193 static void *_sdma_cpu_list_seq_next(struct seq_file *s, void *v, loff_t *pos)
1194 {
1195 	++*pos;
1196 	if (*pos >= num_online_cpus())
1197 		return NULL;
1198 
1199 	return pos;
1200 }
1201 
1202 static void _sdma_cpu_list_seq_stop(struct seq_file *s, void *v)
1203 {
1204 	/* nothing allocated */
1205 }
1206 
1207 static int _sdma_cpu_list_seq_show(struct seq_file *s, void *v)
1208 {
1209 	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
1210 	struct hfi1_devdata *dd = dd_from_dev(ibd);
1211 	loff_t *spos = v;
1212 	loff_t i = *spos;
1213 
1214 	sdma_seqfile_dump_cpu_list(s, dd, (unsigned long)i);
1215 	return 0;
1216 }
1217 
1218 DEBUGFS_SEQ_FILE_OPS(sdma_cpu_list);
1219 DEBUGFS_SEQ_FILE_OPEN(sdma_cpu_list)
1220 DEBUGFS_FILE_OPS(sdma_cpu_list);
1221 
1222 void hfi1_dbg_ibdev_init(struct hfi1_ibdev *ibd)
1223 {
1224 	char name[sizeof("port0counters") + 1];
1225 	char link[10];
1226 	struct hfi1_devdata *dd = dd_from_dev(ibd);
1227 	struct hfi1_pportdata *ppd;
1228 	struct dentry *root;
1229 	int unit = dd->unit;
1230 	int i, j;
1231 
1232 	if (!hfi1_dbg_root)
1233 		return;
1234 	snprintf(name, sizeof(name), "%s_%d", class_name(), unit);
1235 	snprintf(link, sizeof(link), "%d", unit);
1236 	root = debugfs_create_dir(name, hfi1_dbg_root);
1237 	ibd->hfi1_ibdev_dbg = root;
1238 
1239 	ibd->hfi1_ibdev_link =
1240 		debugfs_create_symlink(link, hfi1_dbg_root, name);
1241 
1242 	debugfs_create_file("opcode_stats", 0444, root, ibd,
1243 			    &_opcode_stats_file_ops);
1244 	debugfs_create_file("tx_opcode_stats", 0444, root, ibd,
1245 			    &_tx_opcode_stats_file_ops);
1246 	debugfs_create_file("ctx_stats", 0444, root, ibd, &_ctx_stats_file_ops);
1247 	debugfs_create_file("qp_stats", 0444, root, ibd, &_qp_stats_file_ops);
1248 	debugfs_create_file("sdes", 0444, root, ibd, &_sdes_file_ops);
1249 	debugfs_create_file("rcds", 0444, root, ibd, &_rcds_file_ops);
1250 	debugfs_create_file("pios", 0444, root, ibd, &_pios_file_ops);
1251 	debugfs_create_file("sdma_cpu_list", 0444, root, ibd,
1252 			    &_sdma_cpu_list_file_ops);
1253 
1254 	/* dev counter files */
1255 	for (i = 0; i < ARRAY_SIZE(cntr_ops); i++)
1256 		debugfs_create_file(cntr_ops[i].name, 0444, root, dd,
1257 				    &cntr_ops[i].ops);
1258 
1259 	/* per port files */
1260 	for (ppd = dd->pport, j = 0; j < dd->num_pports; j++, ppd++)
1261 		for (i = 0; i < ARRAY_SIZE(port_cntr_ops); i++) {
1262 			snprintf(name,
1263 				 sizeof(name),
1264 				 port_cntr_ops[i].name,
1265 				 j + 1);
1266 			debugfs_create_file(name,
1267 					    !port_cntr_ops[i].ops.write ?
1268 						    S_IRUGO :
1269 						    S_IRUGO | S_IWUSR,
1270 					    root, ppd, &port_cntr_ops[i].ops);
1271 		}
1272 
1273 	hfi1_fault_init_debugfs(ibd);
1274 }
1275 
1276 void hfi1_dbg_ibdev_exit(struct hfi1_ibdev *ibd)
1277 {
1278 	if (!hfi1_dbg_root)
1279 		goto out;
1280 	hfi1_fault_exit_debugfs(ibd);
1281 	debugfs_remove(ibd->hfi1_ibdev_link);
1282 	debugfs_remove_recursive(ibd->hfi1_ibdev_dbg);
1283 out:
1284 	ibd->hfi1_ibdev_dbg = NULL;
1285 }
1286 
1287 /*
1288  * driver stats field names, one line per stat, single string.  Used by
1289  * programs like hfistats to print the stats in a way which works for
1290  * different versions of drivers, without changing program source.
1291  * if hfi1_ib_stats changes, this needs to change.  Names need to be
1292  * 12 chars or less (w/o newline), for proper display by hfistats utility.
1293  */
1294 static const char * const hfi1_statnames[] = {
1295 	/* must be element 0*/
1296 	"KernIntr",
1297 	"ErrorIntr",
1298 	"Tx_Errs",
1299 	"Rcv_Errs",
1300 	"H/W_Errs",
1301 	"NoPIOBufs",
1302 	"CtxtsOpen",
1303 	"RcvLen_Errs",
1304 	"EgrBufFull",
1305 	"EgrHdrFull"
1306 };
1307 
1308 static void *_driver_stats_names_seq_start(struct seq_file *s, loff_t *pos)
1309 {
1310 	if (*pos >= ARRAY_SIZE(hfi1_statnames))
1311 		return NULL;
1312 	return pos;
1313 }
1314 
1315 static void *_driver_stats_names_seq_next(
1316 	struct seq_file *s,
1317 	void *v,
1318 	loff_t *pos)
1319 {
1320 	++*pos;
1321 	if (*pos >= ARRAY_SIZE(hfi1_statnames))
1322 		return NULL;
1323 	return pos;
1324 }
1325 
1326 static void _driver_stats_names_seq_stop(struct seq_file *s, void *v)
1327 {
1328 }
1329 
1330 static int _driver_stats_names_seq_show(struct seq_file *s, void *v)
1331 {
1332 	loff_t *spos = v;
1333 
1334 	seq_printf(s, "%s\n", hfi1_statnames[*spos]);
1335 	return 0;
1336 }
1337 
1338 DEBUGFS_SEQ_FILE_OPS(driver_stats_names);
1339 DEBUGFS_SEQ_FILE_OPEN(driver_stats_names)
1340 DEBUGFS_FILE_OPS(driver_stats_names);
1341 
1342 static void *_driver_stats_seq_start(struct seq_file *s, loff_t *pos)
1343 {
1344 	if (*pos >= ARRAY_SIZE(hfi1_statnames))
1345 		return NULL;
1346 	return pos;
1347 }
1348 
1349 static void *_driver_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
1350 {
1351 	++*pos;
1352 	if (*pos >= ARRAY_SIZE(hfi1_statnames))
1353 		return NULL;
1354 	return pos;
1355 }
1356 
1357 static void _driver_stats_seq_stop(struct seq_file *s, void *v)
1358 {
1359 }
1360 
1361 static u64 hfi1_sps_ints(void)
1362 {
1363 	unsigned long index, flags;
1364 	struct hfi1_devdata *dd;
1365 	u64 sps_ints = 0;
1366 
1367 	xa_lock_irqsave(&hfi1_dev_table, flags);
1368 	xa_for_each(&hfi1_dev_table, index, dd) {
1369 		sps_ints += get_all_cpu_total(dd->int_counter);
1370 	}
1371 	xa_unlock_irqrestore(&hfi1_dev_table, flags);
1372 	return sps_ints;
1373 }
1374 
1375 static int _driver_stats_seq_show(struct seq_file *s, void *v)
1376 {
1377 	loff_t *spos = v;
1378 	char *buffer;
1379 	u64 *stats = (u64 *)&hfi1_stats;
1380 	size_t sz = seq_get_buf(s, &buffer);
1381 
1382 	if (sz < sizeof(u64))
1383 		return SEQ_SKIP;
1384 	/* special case for interrupts */
1385 	if (*spos == 0)
1386 		*(u64 *)buffer = hfi1_sps_ints();
1387 	else
1388 		*(u64 *)buffer = stats[*spos];
1389 	seq_commit(s,  sizeof(u64));
1390 	return 0;
1391 }
1392 
1393 DEBUGFS_SEQ_FILE_OPS(driver_stats);
1394 DEBUGFS_SEQ_FILE_OPEN(driver_stats)
1395 DEBUGFS_FILE_OPS(driver_stats);
1396 
1397 void hfi1_dbg_init(void)
1398 {
1399 	hfi1_dbg_root  = debugfs_create_dir(DRIVER_NAME, NULL);
1400 	debugfs_create_file("driver_stats_names", 0444, hfi1_dbg_root, NULL,
1401 			    &_driver_stats_names_file_ops);
1402 	debugfs_create_file("driver_stats", 0444, hfi1_dbg_root, NULL,
1403 			    &_driver_stats_file_ops);
1404 }
1405 
1406 void hfi1_dbg_exit(void)
1407 {
1408 	debugfs_remove_recursive(hfi1_dbg_root);
1409 	hfi1_dbg_root = NULL;
1410 }
1411