summaryrefslogtreecommitdiff
path: root/drivers/usb/host/xhci-debugfs.c
blob: 448d7b11dec4cab8987d4fe2999af8e65e2f3249 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
// SPDX-License-Identifier: GPL-2.0
/*
 * xhci-debugfs.c - xHCI debugfs interface
 *
 * Copyright (C) 2017 Intel Corporation
 *
 * Author: Lu Baolu <baolu.lu@linux.intel.com>
 */

#include <linux/slab.h>
#include <linux/uaccess.h>

#include "xhci.h"
#include "xhci-debugfs.h"

static const struct debugfs_reg32 xhci_cap_regs[] = {
	dump_register(CAPLENGTH),
	dump_register(HCSPARAMS1),
	dump_register(HCSPARAMS2),
	dump_register(HCSPARAMS3),
	dump_register(HCCPARAMS1),
	dump_register(DOORBELLOFF),
	dump_register(RUNTIMEOFF),
	dump_register(HCCPARAMS2),
};

static const struct debugfs_reg32 xhci_op_regs[] = {
	dump_register(USBCMD),
	dump_register(USBSTS),
	dump_register(PAGESIZE),
	dump_register(DNCTRL),
	dump_register(CRCR),
	dump_register(DCBAAP_LOW),
	dump_register(DCBAAP_HIGH),
	dump_register(CONFIG),
};

static const struct debugfs_reg32 xhci_runtime_regs[] = {
	dump_register(MFINDEX),
	dump_register(IR0_IMAN),
	dump_register(IR0_IMOD),
	dump_register(IR0_ERSTSZ),
	dump_register(IR0_ERSTBA_LOW),
	dump_register(IR0_ERSTBA_HIGH),
	dump_register(IR0_ERDP_LOW),
	dump_register(IR0_ERDP_HIGH),
};

static const struct debugfs_reg32 xhci_extcap_legsup[] = {
	dump_register(EXTCAP_USBLEGSUP),
	dump_register(EXTCAP_USBLEGCTLSTS),
};

static const struct debugfs_reg32 xhci_extcap_protocol[] = {
	dump_register(EXTCAP_REVISION),
	dump_register(EXTCAP_NAME),
	dump_register(EXTCAP_PORTINFO),
	dump_register(EXTCAP_PORTTYPE),
	dump_register(EXTCAP_MANTISSA1),
	dump_register(EXTCAP_MANTISSA2),
	dump_register(EXTCAP_MANTISSA3),
	dump_register(EXTCAP_MANTISSA4),
	dump_register(EXTCAP_MANTISSA5),
	dump_register(EXTCAP_MANTISSA6),
};

static const struct debugfs_reg32 xhci_extcap_dbc[] = {
	dump_register(EXTCAP_DBC_CAPABILITY),
	dump_register(EXTCAP_DBC_DOORBELL),
	dump_register(EXTCAP_DBC_ERSTSIZE),
	dump_register(EXTCAP_DBC_ERST_LOW),
	dump_register(EXTCAP_DBC_ERST_HIGH),
	dump_register(EXTCAP_DBC_ERDP_LOW),
	dump_register(EXTCAP_DBC_ERDP_HIGH),
	dump_register(EXTCAP_DBC_CONTROL),
	dump_register(EXTCAP_DBC_STATUS),
	dump_register(EXTCAP_DBC_PORTSC),
	dump_register(EXTCAP_DBC_CONT_LOW),
	dump_register(EXTCAP_DBC_CONT_HIGH),
	dump_register(EXTCAP_DBC_DEVINFO1),
	dump_register(EXTCAP_DBC_DEVINFO2),
};

static struct dentry *xhci_debugfs_root;

static struct xhci_regset *xhci_debugfs_alloc_regset(struct xhci_hcd *xhci)
{
	struct xhci_regset	*regset;

	regset = kzalloc(sizeof(*regset), GFP_KERNEL);
	if (!regset)
		return NULL;

	/*
	 * The allocation and free of regset are executed in order.
	 * We needn't a lock here.
	 */
	INIT_LIST_HEAD(&regset->list);
	list_add_tail(&regset->list, &xhci->regset_list);

	return regset;
}

static void xhci_debugfs_free_regset(struct xhci_regset *regset)
{
	if (!regset)
		return;

	list_del(&regset->list);
	kfree(regset);
}

static void xhci_debugfs_regset(struct xhci_hcd *xhci, u32 base,
				const struct debugfs_reg32 *regs,
				size_t nregs, struct dentry *parent,
				const char *fmt, ...)
{
	struct xhci_regset	*rgs;
	va_list			args;
	struct debugfs_regset32	*regset;
	struct usb_hcd		*hcd = xhci_to_hcd(xhci);

	rgs = xhci_debugfs_alloc_regset(xhci);
	if (!rgs)
		return;

	va_start(args, fmt);
	vsnprintf(rgs->name, sizeof(rgs->name), fmt, args);
	va_end(args);

	regset = &rgs->regset;
	regset->regs = regs;
	regset->nregs = nregs;
	regset->base = hcd->regs + base;

	debugfs_create_regset32((const char *)rgs->name, 0444, parent, regset);
}

static void xhci_debugfs_extcap_regset(struct xhci_hcd *xhci, int cap_id,
				       const struct debugfs_reg32 *regs,
				       size_t n, const char *cap_name)
{
	u32			offset;
	int			index = 0;
	size_t			psic, nregs = n;
	void __iomem		*base = &xhci->cap_regs->hc_capbase;

	offset = xhci_find_next_ext_cap(base, 0, cap_id);
	while (offset) {
		if (cap_id == XHCI_EXT_CAPS_PROTOCOL) {
			psic = XHCI_EXT_PORT_PSIC(readl(base + offset + 8));
			nregs = min(4 + psic, n);
		}

		xhci_debugfs_regset(xhci, offset, regs, nregs,
				    xhci->debugfs_root, "%s:%02d",
				    cap_name, index);
		offset = xhci_find_next_ext_cap(base, offset, cap_id);
		index++;
	}
}

static int xhci_ring_enqueue_show(struct seq_file *s, void *unused)
{
	dma_addr_t		dma;
	struct xhci_ring	*ring = *(struct xhci_ring **)s->private;

	dma = xhci_trb_virt_to_dma(ring->enq_seg, ring->enqueue);
	seq_printf(s, "%pad\n", &dma);

	return 0;
}

static int xhci_ring_dequeue_show(struct seq_file *s, void *unused)
{
	dma_addr_t		dma;
	struct xhci_ring	*ring = *(struct xhci_ring **)s->private;

	dma = xhci_trb_virt_to_dma(ring->deq_seg, ring->dequeue);
	seq_printf(s, "%pad\n", &dma);

	return 0;
}

static int xhci_ring_cycle_show(struct seq_file *s, void *unused)
{
	struct xhci_ring	*ring = *(struct xhci_ring **)s->private;

	seq_printf(s, "%d\n", ring->cycle_state);

	return 0;
}

static void xhci_ring_dump_segment(struct seq_file *s,
				   struct xhci_segment *seg)
{
	int			i;
	dma_addr_t		dma;
	union xhci_trb		*trb;

	for (i = 0; i < TRBS_PER_SEGMENT; i++) {
		trb = &seg->trbs[i];
		dma = seg->dma + i * sizeof(*trb);
		seq_printf(s, "%pad: %s\n", &dma,
			   xhci_decode_trb(le32_to_cpu(trb->generic.field[0]),
					   le32_to_cpu(trb->generic.field[1]),
					   le32_to_cpu(trb->generic.field[2]),
					   le32_to_cpu(trb->generic.field[3])));
	}
}

static int xhci_ring_trb_show(struct seq_file *s, void *unused)
{
	int			i;
	struct xhci_ring	*ring = *(struct xhci_ring **)s->private;
	struct xhci_segment	*seg = ring->first_seg;

	for (i = 0; i < ring->num_segs; i++) {
		xhci_ring_dump_segment(s, seg);
		seg = seg->next;
	}

	return 0;
}

static struct xhci_file_map ring_files[] = {
	{"enqueue",		xhci_ring_enqueue_show, },
	{"dequeue",		xhci_ring_dequeue_show, },
	{"cycle",		xhci_ring_cycle_show, },
	{"trbs",		xhci_ring_trb_show, },
};

static int xhci_ring_open(struct inode *inode, struct file *file)
{
	int			i;
	struct xhci_file_map	*f_map;
	const char		*file_name = file_dentry(file)->d_iname;

	for (i = 0; i < ARRAY_SIZE(ring_files); i++) {
		f_map = &ring_files[i];

		if (strcmp(f_map->name, file_name) == 0)
			break;
	}

	return single_open(file, f_map->show, inode->i_private);
}

static const struct file_operations xhci_ring_fops = {
	.open			= xhci_ring_open,
	.read			= seq_read,
	.llseek			= seq_lseek,
	.release		= single_release,
};

static int xhci_slot_context_show(struct seq_file *s, void *unused)
{
	struct xhci_hcd		*xhci;
	struct xhci_slot_ctx	*slot_ctx;
	struct xhci_slot_priv	*priv = s->private;
	struct xhci_virt_device	*dev = priv->dev;

	xhci = hcd_to_xhci(bus_to_hcd(dev->udev->bus));
	slot_ctx = xhci_get_slot_ctx(xhci, dev->out_ctx);
	seq_printf(s, "%pad: %s\n", &dev->out_ctx->dma,
		   xhci_decode_slot_context(le32_to_cpu(slot_ctx->dev_info),
					    le32_to_cpu(slot_ctx->dev_info2),
					    le32_to_cpu(slot_ctx->tt_info),
					    le32_to_cpu(slot_ctx->dev_state)));

	return 0;
}

static int xhci_endpoint_context_show(struct seq_file *s, void *unused)
{
	int			ep_index;
	dma_addr_t		dma;
	struct xhci_hcd		*xhci;
	struct xhci_ep_ctx	*ep_ctx;
	struct xhci_slot_priv	*priv = s->private;
	struct xhci_virt_device	*dev = priv->dev;

	xhci = hcd_to_xhci(bus_to_hcd(dev->udev->bus));

	for (ep_index = 0; ep_index < 31; ep_index++) {
		ep_ctx = xhci_get_ep_ctx(xhci, dev->out_ctx, ep_index);
		dma = dev->out_ctx->dma + (ep_index + 1) * CTX_SIZE(xhci->hcc_params);
		seq_printf(s, "%pad: %s\n", &dma,
			   xhci_decode_ep_context(le32_to_cpu(ep_ctx->ep_info),
						  le32_to_cpu(ep_ctx->ep_info2),
						  le64_to_cpu(ep_ctx->deq),
						  le32_to_cpu(ep_ctx->tx_info)));
	}

	return 0;
}

static int xhci_device_name_show(struct seq_file *s, void *unused)
{
	struct xhci_slot_priv	*priv = s->private;
	struct xhci_virt_device	*dev = priv->dev;

	seq_printf(s, "%s\n", dev_name(&dev->udev->dev));

	return 0;
}

static struct xhci_file_map context_files[] = {
	{"name",		xhci_device_name_show, },
	{"slot-context",	xhci_slot_context_show, },
	{"ep-context",		xhci_endpoint_context_show, },
};

static int xhci_context_open(struct inode *inode, struct file *file)
{
	int			i;
	struct xhci_file_map	*f_map;
	const char		*file_name = file_dentry(file)->d_iname;

	for (i = 0; i < ARRAY_SIZE(context_files); i++) {
		f_map = &context_files[i];

		if (strcmp(f_map->name, file_name) == 0)
			break;
	}

	return single_open(file, f_map->show, inode->i_private);
}

static const struct file_operations xhci_context_fops = {
	.open			= xhci_context_open,
	.read			= seq_read,
	.llseek			= seq_lseek,
	.release		= single_release,
};



static int xhci_portsc_show(struct seq_file *s, void *unused)
{
	struct xhci_port	*port = s->private;
	u32			portsc;

	portsc = readl(port->addr);
	seq_printf(s, "%s\n", xhci_decode_portsc(portsc));

	return 0;
}

static int xhci_port_open(struct inode *inode, struct file *file)
{
	return single_open(file, xhci_portsc_show, inode->i_private);
}

static ssize_t xhci_port_write(struct file *file,  const char __user *ubuf,
			       size_t count, loff_t *ppos)
{
	struct seq_file         *s = file->private_data;
	struct xhci_port	*port = s->private;
	struct xhci_hcd		*xhci = hcd_to_xhci(port->rhub->hcd);
	char                    buf[32];
	u32			portsc;
	unsigned long		flags;

	if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
		return -EFAULT;

	if (!strncmp(buf, "compliance", 10)) {
		/* If CTC is clear, compliance is enabled by default */
		if (!HCC2_CTC(xhci->hcc_params2))
			return count;
		spin_lock_irqsave(&xhci->lock, flags);
		/* compliance mode can only be enabled on ports in RxDetect */
		portsc = readl(port->addr);
		if ((portsc & PORT_PLS_MASK) != XDEV_RXDETECT) {
			spin_unlock_irqrestore(&xhci->lock, flags);
			return -EPERM;
		}
		portsc = xhci_port_state_to_neutral(portsc);
		portsc &= ~PORT_PLS_MASK;
		portsc |= PORT_LINK_STROBE | XDEV_COMP_MODE;
		writel(portsc, port->addr);
		spin_unlock_irqrestore(&xhci->lock, flags);
	} else {
		return -EINVAL;
	}
	return count;
}

static const struct file_operations port_fops = {
	.open			= xhci_port_open,
	.write                  = xhci_port_write,
	.read			= seq_read,
	.llseek			= seq_lseek,
	.release		= single_release,
};

static void xhci_debugfs_create_files(struct xhci_hcd *xhci,
				      struct xhci_file_map *files,
				      size_t nentries, void *data,
				      struct dentry *parent,
				      const struct file_operations *fops)
{
	int			i;

	for (i = 0; i < nentries; i++)
		debugfs_create_file(files[i].name, 0444, parent, data, fops);
}

static struct dentry *xhci_debugfs_create_ring_dir(struct xhci_hcd *xhci,
						   struct xhci_ring **ring,
						   const char *name,
						   struct dentry *parent)
{
	struct dentry		*dir;

	dir = debugfs_create_dir(name, parent);
	xhci_debugfs_create_files(xhci, ring_files, ARRAY_SIZE(ring_files),
				  ring, dir, &xhci_ring_fops);

	return dir;
}

static void xhci_debugfs_create_context_files(struct xhci_hcd *xhci,
					      struct dentry *parent,
					      int slot_id)
{
	struct xhci_virt_device	*dev = xhci->devs[slot_id];

	xhci_debugfs_create_files(xhci, context_files,
				  ARRAY_SIZE(context_files),
				  dev->debugfs_private,
				  parent, &xhci_context_fops);
}

void xhci_debugfs_create_endpoint(struct xhci_hcd *xhci,
				  struct xhci_virt_device *dev,
				  int ep_index)
{
	struct xhci_ep_priv	*epriv;
	struct xhci_slot_priv	*spriv = dev->debugfs_private;

	if (!spriv)
		return;

	if (spriv->eps[ep_index])
		return;

	epriv = kzalloc(sizeof(*epriv), GFP_KERNEL);
	if (!epriv)
		return;

	snprintf(epriv->name, sizeof(epriv->name), "ep%02d", ep_index);
	epriv->root = xhci_debugfs_create_ring_dir(xhci,
						   &dev->eps[ep_index].ring,
						   epriv->name,
						   spriv->root);
	spriv->eps[ep_index] = epriv;
}

void xhci_debugfs_remove_endpoint(struct xhci_hcd *xhci,
				  struct xhci_virt_device *dev,
				  int ep_index)
{
	struct xhci_ep_priv	*epriv;
	struct xhci_slot_priv	*spriv = dev->debugfs_private;

	if (!spriv || !spriv->eps[ep_index])
		return;

	epriv = spriv->eps[ep_index];
	debugfs_remove_recursive(epriv->root);
	spriv->eps[ep_index] = NULL;
	kfree(epriv);
}

void xhci_debugfs_create_slot(struct xhci_hcd *xhci, int slot_id)
{
	struct xhci_slot_priv	*priv;
	struct xhci_virt_device	*dev = xhci->devs[slot_id];

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return;

	snprintf(priv->name, sizeof(priv->name), "%02d", slot_id);
	priv->root = debugfs_create_dir(priv->name, xhci->debugfs_slots);
	priv->dev = dev;
	dev->debugfs_private = priv;

	xhci_debugfs_create_ring_dir(xhci, &dev->eps[0].ring,
				     "ep00", priv->root);

	xhci_debugfs_create_context_files(xhci, priv->root, slot_id);
}

void xhci_debugfs_remove_slot(struct xhci_hcd *xhci, int slot_id)
{
	int			i;
	struct xhci_slot_priv	*priv;
	struct xhci_virt_device	*dev = xhci->devs[slot_id];

	if (!dev || !dev->debugfs_private)
		return;

	priv = dev->debugfs_private;

	debugfs_remove_recursive(priv->root);

	for (i = 0; i < 31; i++)
		kfree(priv->eps[i]);

	kfree(priv);
	dev->debugfs_private = NULL;
}

static void xhci_debugfs_create_ports(struct xhci_hcd *xhci,
				      struct dentry *parent)
{
	unsigned int		num_ports;
	char			port_name[8];
	struct xhci_port	*port;
	struct dentry		*dir;

	num_ports = HCS_MAX_PORTS(xhci->hcs_params1);

	parent = debugfs_create_dir("ports", parent);

	while (num_ports--) {
		scnprintf(port_name, sizeof(port_name), "port%02d",
			  num_ports + 1);
		dir = debugfs_create_dir(port_name, parent);
		port = &xhci->hw_ports[num_ports];
		debugfs_create_file("portsc", 0644, dir, port, &port_fops);
	}
}

void xhci_debugfs_init(struct xhci_hcd *xhci)
{
	struct device		*dev = xhci_to_hcd(xhci)->self.controller;

	xhci->debugfs_root = debugfs_create_dir(dev_name(dev),
						xhci_debugfs_root);

	INIT_LIST_HEAD(&xhci->regset_list);

	xhci_debugfs_regset(xhci,
			    0,
			    xhci_cap_regs, ARRAY_SIZE(xhci_cap_regs),
			    xhci->debugfs_root, "reg-cap");

	xhci_debugfs_regset(xhci,
			    HC_LENGTH(readl(&xhci->cap_regs->hc_capbase)),
			    xhci_op_regs, ARRAY_SIZE(xhci_op_regs),
			    xhci->debugfs_root, "reg-op");

	xhci_debugfs_regset(xhci,
			    readl(&xhci->cap_regs->run_regs_off) & RTSOFF_MASK,
			    xhci_runtime_regs, ARRAY_SIZE(xhci_runtime_regs),
			    xhci->debugfs_root, "reg-runtime");

	xhci_debugfs_extcap_regset(xhci, XHCI_EXT_CAPS_LEGACY,
				   xhci_extcap_legsup,
				   ARRAY_SIZE(xhci_extcap_legsup),
				   "reg-ext-legsup");

	xhci_debugfs_extcap_regset(xhci, XHCI_EXT_CAPS_PROTOCOL,
				   xhci_extcap_protocol,
				   ARRAY_SIZE(xhci_extcap_protocol),
				   "reg-ext-protocol");

	xhci_debugfs_extcap_regset(xhci, XHCI_EXT_CAPS_DEBUG,
				   xhci_extcap_dbc,
				   ARRAY_SIZE(xhci_extcap_dbc),
				   "reg-ext-dbc");

	xhci_debugfs_create_ring_dir(xhci, &xhci->cmd_ring,
				     "command-ring",
				     xhci->debugfs_root);

	xhci_debugfs_create_ring_dir(xhci, &xhci->event_ring,
				     "event-ring",
				     xhci->debugfs_root);

	xhci->debugfs_slots = debugfs_create_dir("devices", xhci->debugfs_root);

	xhci_debugfs_create_ports(xhci, xhci->debugfs_root);
}

void xhci_debugfs_exit(struct xhci_hcd *xhci)
{
	struct xhci_regset	*rgs, *tmp;

	debugfs_remove_recursive(xhci->debugfs_root);
	xhci->debugfs_root = NULL;
	xhci->debugfs_slots = NULL;

	list_for_each_entry_safe(rgs, tmp, &xhci->regset_list, list)
		xhci_debugfs_free_regset(rgs);
}

void __init xhci_debugfs_create_root(void)
{
	xhci_debugfs_root = debugfs_create_dir("xhci", usb_debug_root);
}

void __exit xhci_debugfs_remove_root(void)
{
	debugfs_remove_recursive(xhci_debugfs_root);
	xhci_debugfs_root = NULL;
}