xref: /linux/drivers/usb/host/xhci-debugfs.c (revision 06d07429858317ded2db7986113a9e0129cd599b)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * xhci-debugfs.c - xHCI debugfs interface
4  *
5  * Copyright (C) 2017 Intel Corporation
6  *
7  * Author: Lu Baolu <baolu.lu@linux.intel.com>
8  */
9 
10 #include <linux/slab.h>
11 #include <linux/uaccess.h>
12 
13 #include "xhci.h"
14 #include "xhci-debugfs.h"
15 
16 static const struct debugfs_reg32 xhci_cap_regs[] = {
17 	dump_register(CAPLENGTH),
18 	dump_register(HCSPARAMS1),
19 	dump_register(HCSPARAMS2),
20 	dump_register(HCSPARAMS3),
21 	dump_register(HCCPARAMS1),
22 	dump_register(DOORBELLOFF),
23 	dump_register(RUNTIMEOFF),
24 	dump_register(HCCPARAMS2),
25 };
26 
27 static const struct debugfs_reg32 xhci_op_regs[] = {
28 	dump_register(USBCMD),
29 	dump_register(USBSTS),
30 	dump_register(PAGESIZE),
31 	dump_register(DNCTRL),
32 	dump_register(CRCR),
33 	dump_register(DCBAAP_LOW),
34 	dump_register(DCBAAP_HIGH),
35 	dump_register(CONFIG),
36 };
37 
38 static const struct debugfs_reg32 xhci_runtime_regs[] = {
39 	dump_register(MFINDEX),
40 	dump_register(IR0_IMAN),
41 	dump_register(IR0_IMOD),
42 	dump_register(IR0_ERSTSZ),
43 	dump_register(IR0_ERSTBA_LOW),
44 	dump_register(IR0_ERSTBA_HIGH),
45 	dump_register(IR0_ERDP_LOW),
46 	dump_register(IR0_ERDP_HIGH),
47 };
48 
49 static const struct debugfs_reg32 xhci_extcap_legsup[] = {
50 	dump_register(EXTCAP_USBLEGSUP),
51 	dump_register(EXTCAP_USBLEGCTLSTS),
52 };
53 
54 static const struct debugfs_reg32 xhci_extcap_protocol[] = {
55 	dump_register(EXTCAP_REVISION),
56 	dump_register(EXTCAP_NAME),
57 	dump_register(EXTCAP_PORTINFO),
58 	dump_register(EXTCAP_PORTTYPE),
59 	dump_register(EXTCAP_MANTISSA1),
60 	dump_register(EXTCAP_MANTISSA2),
61 	dump_register(EXTCAP_MANTISSA3),
62 	dump_register(EXTCAP_MANTISSA4),
63 	dump_register(EXTCAP_MANTISSA5),
64 	dump_register(EXTCAP_MANTISSA6),
65 };
66 
67 static const struct debugfs_reg32 xhci_extcap_dbc[] = {
68 	dump_register(EXTCAP_DBC_CAPABILITY),
69 	dump_register(EXTCAP_DBC_DOORBELL),
70 	dump_register(EXTCAP_DBC_ERSTSIZE),
71 	dump_register(EXTCAP_DBC_ERST_LOW),
72 	dump_register(EXTCAP_DBC_ERST_HIGH),
73 	dump_register(EXTCAP_DBC_ERDP_LOW),
74 	dump_register(EXTCAP_DBC_ERDP_HIGH),
75 	dump_register(EXTCAP_DBC_CONTROL),
76 	dump_register(EXTCAP_DBC_STATUS),
77 	dump_register(EXTCAP_DBC_PORTSC),
78 	dump_register(EXTCAP_DBC_CONT_LOW),
79 	dump_register(EXTCAP_DBC_CONT_HIGH),
80 	dump_register(EXTCAP_DBC_DEVINFO1),
81 	dump_register(EXTCAP_DBC_DEVINFO2),
82 };
83 
84 static struct dentry *xhci_debugfs_root;
85 
xhci_debugfs_alloc_regset(struct xhci_hcd * xhci)86 static struct xhci_regset *xhci_debugfs_alloc_regset(struct xhci_hcd *xhci)
87 {
88 	struct xhci_regset	*regset;
89 
90 	regset = kzalloc(sizeof(*regset), GFP_KERNEL);
91 	if (!regset)
92 		return NULL;
93 
94 	/*
95 	 * The allocation and free of regset are executed in order.
96 	 * We needn't a lock here.
97 	 */
98 	INIT_LIST_HEAD(&regset->list);
99 	list_add_tail(&regset->list, &xhci->regset_list);
100 
101 	return regset;
102 }
103 
xhci_debugfs_free_regset(struct xhci_regset * regset)104 static void xhci_debugfs_free_regset(struct xhci_regset *regset)
105 {
106 	if (!regset)
107 		return;
108 
109 	list_del(&regset->list);
110 	kfree(regset);
111 }
112 
113 __printf(6, 7)
xhci_debugfs_regset(struct xhci_hcd * xhci,u32 base,const struct debugfs_reg32 * regs,size_t nregs,struct dentry * parent,const char * fmt,...)114 static void xhci_debugfs_regset(struct xhci_hcd *xhci, u32 base,
115 				const struct debugfs_reg32 *regs,
116 				size_t nregs, struct dentry *parent,
117 				const char *fmt, ...)
118 {
119 	struct xhci_regset	*rgs;
120 	va_list			args;
121 	struct debugfs_regset32	*regset;
122 	struct usb_hcd		*hcd = xhci_to_hcd(xhci);
123 
124 	rgs = xhci_debugfs_alloc_regset(xhci);
125 	if (!rgs)
126 		return;
127 
128 	va_start(args, fmt);
129 	vsnprintf(rgs->name, sizeof(rgs->name), fmt, args);
130 	va_end(args);
131 
132 	regset = &rgs->regset;
133 	regset->regs = regs;
134 	regset->nregs = nregs;
135 	regset->base = hcd->regs + base;
136 	regset->dev = hcd->self.controller;
137 
138 	debugfs_create_regset32((const char *)rgs->name, 0444, parent, regset);
139 }
140 
xhci_debugfs_extcap_regset(struct xhci_hcd * xhci,int cap_id,const struct debugfs_reg32 * regs,size_t n,const char * cap_name)141 static void xhci_debugfs_extcap_regset(struct xhci_hcd *xhci, int cap_id,
142 				       const struct debugfs_reg32 *regs,
143 				       size_t n, const char *cap_name)
144 {
145 	u32			offset;
146 	int			index = 0;
147 	size_t			psic, nregs = n;
148 	void __iomem		*base = &xhci->cap_regs->hc_capbase;
149 
150 	offset = xhci_find_next_ext_cap(base, 0, cap_id);
151 	while (offset) {
152 		if (cap_id == XHCI_EXT_CAPS_PROTOCOL) {
153 			psic = XHCI_EXT_PORT_PSIC(readl(base + offset + 8));
154 			nregs = min(4 + psic, n);
155 		}
156 
157 		xhci_debugfs_regset(xhci, offset, regs, nregs,
158 				    xhci->debugfs_root, "%s:%02d",
159 				    cap_name, index);
160 		offset = xhci_find_next_ext_cap(base, offset, cap_id);
161 		index++;
162 	}
163 }
164 
xhci_ring_enqueue_show(struct seq_file * s,void * unused)165 static int xhci_ring_enqueue_show(struct seq_file *s, void *unused)
166 {
167 	dma_addr_t		dma;
168 	struct xhci_ring	*ring = *(struct xhci_ring **)s->private;
169 
170 	dma = xhci_trb_virt_to_dma(ring->enq_seg, ring->enqueue);
171 	seq_printf(s, "%pad\n", &dma);
172 
173 	return 0;
174 }
175 
xhci_ring_dequeue_show(struct seq_file * s,void * unused)176 static int xhci_ring_dequeue_show(struct seq_file *s, void *unused)
177 {
178 	dma_addr_t		dma;
179 	struct xhci_ring	*ring = *(struct xhci_ring **)s->private;
180 
181 	dma = xhci_trb_virt_to_dma(ring->deq_seg, ring->dequeue);
182 	seq_printf(s, "%pad\n", &dma);
183 
184 	return 0;
185 }
186 
xhci_ring_cycle_show(struct seq_file * s,void * unused)187 static int xhci_ring_cycle_show(struct seq_file *s, void *unused)
188 {
189 	struct xhci_ring	*ring = *(struct xhci_ring **)s->private;
190 
191 	seq_printf(s, "%d\n", ring->cycle_state);
192 
193 	return 0;
194 }
195 
xhci_ring_dump_segment(struct seq_file * s,struct xhci_segment * seg)196 static void xhci_ring_dump_segment(struct seq_file *s,
197 				   struct xhci_segment *seg)
198 {
199 	int			i;
200 	dma_addr_t		dma;
201 	union xhci_trb		*trb;
202 	char			str[XHCI_MSG_MAX];
203 
204 	for (i = 0; i < TRBS_PER_SEGMENT; i++) {
205 		trb = &seg->trbs[i];
206 		dma = seg->dma + i * sizeof(*trb);
207 		seq_printf(s, "%2u %pad: %s\n", seg->num, &dma,
208 			   xhci_decode_trb(str, XHCI_MSG_MAX, le32_to_cpu(trb->generic.field[0]),
209 					   le32_to_cpu(trb->generic.field[1]),
210 					   le32_to_cpu(trb->generic.field[2]),
211 					   le32_to_cpu(trb->generic.field[3])));
212 	}
213 }
214 
xhci_ring_trb_show(struct seq_file * s,void * unused)215 static int xhci_ring_trb_show(struct seq_file *s, void *unused)
216 {
217 	int			i;
218 	struct xhci_ring	*ring = *(struct xhci_ring **)s->private;
219 	struct xhci_segment	*seg = ring->first_seg;
220 
221 	for (i = 0; i < ring->num_segs; i++) {
222 		xhci_ring_dump_segment(s, seg);
223 		seg = seg->next;
224 	}
225 
226 	return 0;
227 }
228 
229 static struct xhci_file_map ring_files[] = {
230 	{"enqueue",		xhci_ring_enqueue_show, },
231 	{"dequeue",		xhci_ring_dequeue_show, },
232 	{"cycle",		xhci_ring_cycle_show, },
233 	{"trbs",		xhci_ring_trb_show, },
234 };
235 
xhci_ring_open(struct inode * inode,struct file * file)236 static int xhci_ring_open(struct inode *inode, struct file *file)
237 {
238 	int			i;
239 	struct xhci_file_map	*f_map;
240 	const char		*file_name = file_dentry(file)->d_iname;
241 
242 	for (i = 0; i < ARRAY_SIZE(ring_files); i++) {
243 		f_map = &ring_files[i];
244 
245 		if (strcmp(f_map->name, file_name) == 0)
246 			break;
247 	}
248 
249 	return single_open(file, f_map->show, inode->i_private);
250 }
251 
252 static const struct file_operations xhci_ring_fops = {
253 	.open			= xhci_ring_open,
254 	.read			= seq_read,
255 	.llseek			= seq_lseek,
256 	.release		= single_release,
257 };
258 
xhci_slot_context_show(struct seq_file * s,void * unused)259 static int xhci_slot_context_show(struct seq_file *s, void *unused)
260 {
261 	struct xhci_hcd		*xhci;
262 	struct xhci_slot_ctx	*slot_ctx;
263 	struct xhci_slot_priv	*priv = s->private;
264 	struct xhci_virt_device	*dev = priv->dev;
265 	char			str[XHCI_MSG_MAX];
266 
267 	xhci = hcd_to_xhci(bus_to_hcd(dev->udev->bus));
268 	slot_ctx = xhci_get_slot_ctx(xhci, dev->out_ctx);
269 	seq_printf(s, "%pad: %s\n", &dev->out_ctx->dma,
270 		   xhci_decode_slot_context(str,
271 					    le32_to_cpu(slot_ctx->dev_info),
272 					    le32_to_cpu(slot_ctx->dev_info2),
273 					    le32_to_cpu(slot_ctx->tt_info),
274 					    le32_to_cpu(slot_ctx->dev_state)));
275 
276 	return 0;
277 }
278 
xhci_endpoint_context_show(struct seq_file * s,void * unused)279 static int xhci_endpoint_context_show(struct seq_file *s, void *unused)
280 {
281 	int			ep_index;
282 	dma_addr_t		dma;
283 	struct xhci_hcd		*xhci;
284 	struct xhci_ep_ctx	*ep_ctx;
285 	struct xhci_slot_priv	*priv = s->private;
286 	struct xhci_virt_device	*dev = priv->dev;
287 	char			str[XHCI_MSG_MAX];
288 
289 	xhci = hcd_to_xhci(bus_to_hcd(dev->udev->bus));
290 
291 	for (ep_index = 0; ep_index < 31; ep_index++) {
292 		ep_ctx = xhci_get_ep_ctx(xhci, dev->out_ctx, ep_index);
293 		dma = dev->out_ctx->dma + (ep_index + 1) * CTX_SIZE(xhci->hcc_params);
294 		seq_printf(s, "%pad: %s\n", &dma,
295 			   xhci_decode_ep_context(str,
296 						  le32_to_cpu(ep_ctx->ep_info),
297 						  le32_to_cpu(ep_ctx->ep_info2),
298 						  le64_to_cpu(ep_ctx->deq),
299 						  le32_to_cpu(ep_ctx->tx_info)));
300 	}
301 
302 	return 0;
303 }
304 
xhci_device_name_show(struct seq_file * s,void * unused)305 static int xhci_device_name_show(struct seq_file *s, void *unused)
306 {
307 	struct xhci_slot_priv	*priv = s->private;
308 	struct xhci_virt_device	*dev = priv->dev;
309 
310 	seq_printf(s, "%s\n", dev_name(&dev->udev->dev));
311 
312 	return 0;
313 }
314 
315 static struct xhci_file_map context_files[] = {
316 	{"name",		xhci_device_name_show, },
317 	{"slot-context",	xhci_slot_context_show, },
318 	{"ep-context",		xhci_endpoint_context_show, },
319 };
320 
xhci_context_open(struct inode * inode,struct file * file)321 static int xhci_context_open(struct inode *inode, struct file *file)
322 {
323 	int			i;
324 	struct xhci_file_map	*f_map;
325 	const char		*file_name = file_dentry(file)->d_iname;
326 
327 	for (i = 0; i < ARRAY_SIZE(context_files); i++) {
328 		f_map = &context_files[i];
329 
330 		if (strcmp(f_map->name, file_name) == 0)
331 			break;
332 	}
333 
334 	return single_open(file, f_map->show, inode->i_private);
335 }
336 
337 static const struct file_operations xhci_context_fops = {
338 	.open			= xhci_context_open,
339 	.read			= seq_read,
340 	.llseek			= seq_lseek,
341 	.release		= single_release,
342 };
343 
344 
345 
xhci_portsc_show(struct seq_file * s,void * unused)346 static int xhci_portsc_show(struct seq_file *s, void *unused)
347 {
348 	struct xhci_port	*port = s->private;
349 	u32			portsc;
350 	char			str[XHCI_MSG_MAX];
351 
352 	portsc = readl(port->addr);
353 	seq_printf(s, "%s\n", xhci_decode_portsc(str, portsc));
354 
355 	return 0;
356 }
357 
xhci_port_open(struct inode * inode,struct file * file)358 static int xhci_port_open(struct inode *inode, struct file *file)
359 {
360 	return single_open(file, xhci_portsc_show, inode->i_private);
361 }
362 
xhci_port_write(struct file * file,const char __user * ubuf,size_t count,loff_t * ppos)363 static ssize_t xhci_port_write(struct file *file,  const char __user *ubuf,
364 			       size_t count, loff_t *ppos)
365 {
366 	struct seq_file         *s = file->private_data;
367 	struct xhci_port	*port = s->private;
368 	struct xhci_hcd		*xhci = hcd_to_xhci(port->rhub->hcd);
369 	char                    buf[32];
370 	u32			portsc;
371 	unsigned long		flags;
372 
373 	if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
374 		return -EFAULT;
375 
376 	if (!strncmp(buf, "compliance", 10)) {
377 		/* If CTC is clear, compliance is enabled by default */
378 		if (!HCC2_CTC(xhci->hcc_params2))
379 			return count;
380 		spin_lock_irqsave(&xhci->lock, flags);
381 		/* compliance mode can only be enabled on ports in RxDetect */
382 		portsc = readl(port->addr);
383 		if ((portsc & PORT_PLS_MASK) != XDEV_RXDETECT) {
384 			spin_unlock_irqrestore(&xhci->lock, flags);
385 			return -EPERM;
386 		}
387 		portsc = xhci_port_state_to_neutral(portsc);
388 		portsc &= ~PORT_PLS_MASK;
389 		portsc |= PORT_LINK_STROBE | XDEV_COMP_MODE;
390 		writel(portsc, port->addr);
391 		spin_unlock_irqrestore(&xhci->lock, flags);
392 	} else {
393 		return -EINVAL;
394 	}
395 	return count;
396 }
397 
398 static const struct file_operations port_fops = {
399 	.open			= xhci_port_open,
400 	.write                  = xhci_port_write,
401 	.read			= seq_read,
402 	.llseek			= seq_lseek,
403 	.release		= single_release,
404 };
405 
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)406 static void xhci_debugfs_create_files(struct xhci_hcd *xhci,
407 				      struct xhci_file_map *files,
408 				      size_t nentries, void *data,
409 				      struct dentry *parent,
410 				      const struct file_operations *fops)
411 {
412 	int			i;
413 
414 	for (i = 0; i < nentries; i++)
415 		debugfs_create_file(files[i].name, 0444, parent, data, fops);
416 }
417 
xhci_debugfs_create_ring_dir(struct xhci_hcd * xhci,struct xhci_ring ** ring,const char * name,struct dentry * parent)418 static struct dentry *xhci_debugfs_create_ring_dir(struct xhci_hcd *xhci,
419 						   struct xhci_ring **ring,
420 						   const char *name,
421 						   struct dentry *parent)
422 {
423 	struct dentry		*dir;
424 
425 	dir = debugfs_create_dir(name, parent);
426 	xhci_debugfs_create_files(xhci, ring_files, ARRAY_SIZE(ring_files),
427 				  ring, dir, &xhci_ring_fops);
428 
429 	return dir;
430 }
431 
xhci_debugfs_create_context_files(struct xhci_hcd * xhci,struct dentry * parent,int slot_id)432 static void xhci_debugfs_create_context_files(struct xhci_hcd *xhci,
433 					      struct dentry *parent,
434 					      int slot_id)
435 {
436 	struct xhci_virt_device	*dev = xhci->devs[slot_id];
437 
438 	xhci_debugfs_create_files(xhci, context_files,
439 				  ARRAY_SIZE(context_files),
440 				  dev->debugfs_private,
441 				  parent, &xhci_context_fops);
442 }
443 
xhci_debugfs_create_endpoint(struct xhci_hcd * xhci,struct xhci_virt_device * dev,int ep_index)444 void xhci_debugfs_create_endpoint(struct xhci_hcd *xhci,
445 				  struct xhci_virt_device *dev,
446 				  int ep_index)
447 {
448 	struct xhci_ep_priv	*epriv;
449 	struct xhci_slot_priv	*spriv = dev->debugfs_private;
450 
451 	if (!spriv)
452 		return;
453 
454 	if (spriv->eps[ep_index])
455 		return;
456 
457 	epriv = kzalloc(sizeof(*epriv), GFP_KERNEL);
458 	if (!epriv)
459 		return;
460 
461 	epriv->show_ring = dev->eps[ep_index].ring;
462 
463 	snprintf(epriv->name, sizeof(epriv->name), "ep%02d", ep_index);
464 	epriv->root = xhci_debugfs_create_ring_dir(xhci,
465 						   &epriv->show_ring,
466 						   epriv->name,
467 						   spriv->root);
468 	spriv->eps[ep_index] = epriv;
469 }
470 
xhci_debugfs_remove_endpoint(struct xhci_hcd * xhci,struct xhci_virt_device * dev,int ep_index)471 void xhci_debugfs_remove_endpoint(struct xhci_hcd *xhci,
472 				  struct xhci_virt_device *dev,
473 				  int ep_index)
474 {
475 	struct xhci_ep_priv	*epriv;
476 	struct xhci_slot_priv	*spriv = dev->debugfs_private;
477 
478 	if (!spriv || !spriv->eps[ep_index])
479 		return;
480 
481 	epriv = spriv->eps[ep_index];
482 	debugfs_remove_recursive(epriv->root);
483 	spriv->eps[ep_index] = NULL;
484 	kfree(epriv);
485 }
486 
xhci_stream_id_show(struct seq_file * s,void * unused)487 static int xhci_stream_id_show(struct seq_file *s, void *unused)
488 {
489 	struct xhci_ep_priv	*epriv = s->private;
490 
491 	if (!epriv->stream_info)
492 		return -EPERM;
493 
494 	seq_printf(s, "Show stream ID %d trb ring, supported [1 - %d]\n",
495 		   epriv->stream_id, epriv->stream_info->num_streams - 1);
496 
497 	return 0;
498 }
499 
xhci_stream_id_open(struct inode * inode,struct file * file)500 static int xhci_stream_id_open(struct inode *inode, struct file *file)
501 {
502 	return single_open(file, xhci_stream_id_show, inode->i_private);
503 }
504 
xhci_stream_id_write(struct file * file,const char __user * ubuf,size_t count,loff_t * ppos)505 static ssize_t xhci_stream_id_write(struct file *file,  const char __user *ubuf,
506 			       size_t count, loff_t *ppos)
507 {
508 	struct seq_file         *s = file->private_data;
509 	struct xhci_ep_priv	*epriv = s->private;
510 	int			ret;
511 	u16			stream_id; /* MaxPStreams + 1 <= 16 */
512 
513 	if (!epriv->stream_info)
514 		return -EPERM;
515 
516 	/* Decimal number */
517 	ret = kstrtou16_from_user(ubuf, count, 10, &stream_id);
518 	if (ret)
519 		return ret;
520 
521 	if (stream_id == 0 || stream_id >= epriv->stream_info->num_streams)
522 		return -EINVAL;
523 
524 	epriv->stream_id = stream_id;
525 	epriv->show_ring = epriv->stream_info->stream_rings[stream_id];
526 
527 	return count;
528 }
529 
530 static const struct file_operations stream_id_fops = {
531 	.open			= xhci_stream_id_open,
532 	.write                  = xhci_stream_id_write,
533 	.read			= seq_read,
534 	.llseek			= seq_lseek,
535 	.release		= single_release,
536 };
537 
xhci_stream_context_array_show(struct seq_file * s,void * unused)538 static int xhci_stream_context_array_show(struct seq_file *s, void *unused)
539 {
540 	struct xhci_ep_priv	*epriv = s->private;
541 	struct xhci_stream_ctx	*stream_ctx;
542 	dma_addr_t		dma;
543 	int			id;
544 
545 	if (!epriv->stream_info)
546 		return -EPERM;
547 
548 	seq_printf(s, "Allocated %d streams and %d stream context array entries\n",
549 			epriv->stream_info->num_streams,
550 			epriv->stream_info->num_stream_ctxs);
551 
552 	for (id = 0; id < epriv->stream_info->num_stream_ctxs; id++) {
553 		stream_ctx = epriv->stream_info->stream_ctx_array + id;
554 		dma = epriv->stream_info->ctx_array_dma + id * 16;
555 		if (id < epriv->stream_info->num_streams)
556 			seq_printf(s, "%pad stream id %d deq %016llx\n", &dma,
557 				   id, le64_to_cpu(stream_ctx->stream_ring));
558 		else
559 			seq_printf(s, "%pad stream context entry not used deq %016llx\n",
560 				   &dma, le64_to_cpu(stream_ctx->stream_ring));
561 	}
562 
563 	return 0;
564 }
565 DEFINE_SHOW_ATTRIBUTE(xhci_stream_context_array);
566 
xhci_debugfs_create_stream_files(struct xhci_hcd * xhci,struct xhci_virt_device * dev,int ep_index)567 void xhci_debugfs_create_stream_files(struct xhci_hcd *xhci,
568 				      struct xhci_virt_device *dev,
569 				      int ep_index)
570 {
571 	struct xhci_slot_priv	*spriv = dev->debugfs_private;
572 	struct xhci_ep_priv	*epriv;
573 
574 	if (!spriv || !spriv->eps[ep_index] ||
575 	    !dev->eps[ep_index].stream_info)
576 		return;
577 
578 	epriv = spriv->eps[ep_index];
579 	epriv->stream_info = dev->eps[ep_index].stream_info;
580 
581 	/* Show trb ring of stream ID 1 by default */
582 	epriv->stream_id = 1;
583 	epriv->show_ring = epriv->stream_info->stream_rings[1];
584 	debugfs_create_file("stream_id", 0644,
585 			    epriv->root, epriv,
586 			    &stream_id_fops);
587 	debugfs_create_file("stream_context_array", 0444,
588 			    epriv->root, epriv,
589 			    &xhci_stream_context_array_fops);
590 }
591 
xhci_debugfs_create_slot(struct xhci_hcd * xhci,int slot_id)592 void xhci_debugfs_create_slot(struct xhci_hcd *xhci, int slot_id)
593 {
594 	struct xhci_slot_priv	*priv;
595 	struct xhci_virt_device	*dev = xhci->devs[slot_id];
596 
597 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
598 	if (!priv)
599 		return;
600 
601 	snprintf(priv->name, sizeof(priv->name), "%02d", slot_id);
602 	priv->root = debugfs_create_dir(priv->name, xhci->debugfs_slots);
603 	priv->dev = dev;
604 	dev->debugfs_private = priv;
605 
606 	xhci_debugfs_create_ring_dir(xhci, &dev->eps[0].ring,
607 				     "ep00", priv->root);
608 
609 	xhci_debugfs_create_context_files(xhci, priv->root, slot_id);
610 }
611 
xhci_debugfs_remove_slot(struct xhci_hcd * xhci,int slot_id)612 void xhci_debugfs_remove_slot(struct xhci_hcd *xhci, int slot_id)
613 {
614 	int			i;
615 	struct xhci_slot_priv	*priv;
616 	struct xhci_virt_device	*dev = xhci->devs[slot_id];
617 
618 	if (!dev || !dev->debugfs_private)
619 		return;
620 
621 	priv = dev->debugfs_private;
622 
623 	debugfs_remove_recursive(priv->root);
624 
625 	for (i = 0; i < 31; i++)
626 		kfree(priv->eps[i]);
627 
628 	kfree(priv);
629 	dev->debugfs_private = NULL;
630 }
631 
xhci_debugfs_create_ports(struct xhci_hcd * xhci,struct dentry * parent)632 static void xhci_debugfs_create_ports(struct xhci_hcd *xhci,
633 				      struct dentry *parent)
634 {
635 	unsigned int		num_ports;
636 	char			port_name[8];
637 	struct xhci_port	*port;
638 	struct dentry		*dir;
639 
640 	num_ports = HCS_MAX_PORTS(xhci->hcs_params1);
641 
642 	parent = debugfs_create_dir("ports", parent);
643 
644 	while (num_ports--) {
645 		scnprintf(port_name, sizeof(port_name), "port%02d",
646 			  num_ports + 1);
647 		dir = debugfs_create_dir(port_name, parent);
648 		port = &xhci->hw_ports[num_ports];
649 		debugfs_create_file("portsc", 0644, dir, port, &port_fops);
650 	}
651 }
652 
xhci_debugfs_init(struct xhci_hcd * xhci)653 void xhci_debugfs_init(struct xhci_hcd *xhci)
654 {
655 	struct device		*dev = xhci_to_hcd(xhci)->self.controller;
656 
657 	xhci->debugfs_root = debugfs_create_dir(dev_name(dev),
658 						xhci_debugfs_root);
659 
660 	INIT_LIST_HEAD(&xhci->regset_list);
661 
662 	xhci_debugfs_regset(xhci,
663 			    0,
664 			    xhci_cap_regs, ARRAY_SIZE(xhci_cap_regs),
665 			    xhci->debugfs_root, "reg-cap");
666 
667 	xhci_debugfs_regset(xhci,
668 			    HC_LENGTH(readl(&xhci->cap_regs->hc_capbase)),
669 			    xhci_op_regs, ARRAY_SIZE(xhci_op_regs),
670 			    xhci->debugfs_root, "reg-op");
671 
672 	xhci_debugfs_regset(xhci,
673 			    readl(&xhci->cap_regs->run_regs_off) & RTSOFF_MASK,
674 			    xhci_runtime_regs, ARRAY_SIZE(xhci_runtime_regs),
675 			    xhci->debugfs_root, "reg-runtime");
676 
677 	xhci_debugfs_extcap_regset(xhci, XHCI_EXT_CAPS_LEGACY,
678 				   xhci_extcap_legsup,
679 				   ARRAY_SIZE(xhci_extcap_legsup),
680 				   "reg-ext-legsup");
681 
682 	xhci_debugfs_extcap_regset(xhci, XHCI_EXT_CAPS_PROTOCOL,
683 				   xhci_extcap_protocol,
684 				   ARRAY_SIZE(xhci_extcap_protocol),
685 				   "reg-ext-protocol");
686 
687 	xhci_debugfs_extcap_regset(xhci, XHCI_EXT_CAPS_DEBUG,
688 				   xhci_extcap_dbc,
689 				   ARRAY_SIZE(xhci_extcap_dbc),
690 				   "reg-ext-dbc");
691 
692 	xhci_debugfs_create_ring_dir(xhci, &xhci->cmd_ring,
693 				     "command-ring",
694 				     xhci->debugfs_root);
695 
696 	xhci_debugfs_create_ring_dir(xhci, &xhci->interrupters[0]->event_ring,
697 				     "event-ring",
698 				     xhci->debugfs_root);
699 
700 	xhci->debugfs_slots = debugfs_create_dir("devices", xhci->debugfs_root);
701 
702 	xhci_debugfs_create_ports(xhci, xhci->debugfs_root);
703 }
704 
xhci_debugfs_exit(struct xhci_hcd * xhci)705 void xhci_debugfs_exit(struct xhci_hcd *xhci)
706 {
707 	struct xhci_regset	*rgs, *tmp;
708 
709 	debugfs_remove_recursive(xhci->debugfs_root);
710 	xhci->debugfs_root = NULL;
711 	xhci->debugfs_slots = NULL;
712 
713 	list_for_each_entry_safe(rgs, tmp, &xhci->regset_list, list)
714 		xhci_debugfs_free_regset(rgs);
715 }
716 
xhci_debugfs_create_root(void)717 void __init xhci_debugfs_create_root(void)
718 {
719 	xhci_debugfs_root = debugfs_create_dir("xhci", usb_debug_root);
720 }
721 
xhci_debugfs_remove_root(void)722 void __exit xhci_debugfs_remove_root(void)
723 {
724 	debugfs_remove_recursive(xhci_debugfs_root);
725 	xhci_debugfs_root = NULL;
726 }
727