drivers/usb/host/uhci-debug.c - maze/linux - Git at Google

 /*
  * UHCI-specific debugging code. Invaluable when something
  * goes wrong, but don't get in my face.
  *
  * Kernel visible pointers are surrounded in []s and bus
  * visible pointers are surrounded in ()s
  *
  * (C) Copyright 1999 Linus Torvalds
  * (C) Copyright 1999-2001 Johannes Erdfelt
  */

 #include <linux/config.h>
 #include <linux/kernel.h>
 #include <linux/debugfs.h>
 #include <linux/smp_lock.h>
 #include <asm/io.h>

 #include "uhci-hcd.h"

 #define uhci_debug_operations (* (struct file_operations *) NULL)
 static struct dentry *uhci_debugfs_root;

 #ifdef DEBUG

 /* Handle REALLY large printks so we don't overflow buffers */
 static void lprintk(char *buf)
 {
 	char *p;

 	/* Just write one line at a time */
 	while (buf) {
 		p = strchr(buf, '\n');
 		if (p)
 			*p = 0;
 		printk(KERN_DEBUG "%s\n", buf);
 		buf = p;
 		if (buf)
 			buf++;
 	}
 }

 static int uhci_show_td(struct uhci_td *td, char *buf, int len, int space)
 {
 	char *out = buf;
 	char *spid;
 	u32 status, token;

 	/* Try to make sure there's enough memory */
 	if (len < 160)
 		return 0;

 	status = td_status(td);
 	out += sprintf(out, "%*s[%p] link (%08x) ", space, "", td, le32_to_cpu(td->link));
 	out += sprintf(out, "e%d %s%s%s%s%s%s%s%s%s%sLength=%x ",
 		((status >> 27) & 3),
 		(status & TD_CTRL_SPD) ?      "SPD " : "",
 		(status & TD_CTRL_LS) ?       "LS " : "",
 		(status & TD_CTRL_IOC) ?      "IOC " : "",
 		(status & TD_CTRL_ACTIVE) ?   "Active " : "",
 		(status & TD_CTRL_STALLED) ?  "Stalled " : "",
 		(status & TD_CTRL_DBUFERR) ?  "DataBufErr " : "",
 		(status & TD_CTRL_BABBLE) ?   "Babble " : "",
 		(status & TD_CTRL_NAK) ?      "NAK " : "",
 		(status & TD_CTRL_CRCTIMEO) ? "CRC/Timeo " : "",
 		(status & TD_CTRL_BITSTUFF) ? "BitStuff " : "",
 		status & 0x7ff);

 	token = td_token(td);
 	switch (uhci_packetid(token)) {
 		case USB_PID_SETUP:
 			spid = "SETUP";
 			break;
 		case USB_PID_OUT:
 			spid = "OUT";
 			break;
 		case USB_PID_IN:
 			spid = "IN";
 			break;
 		default:
 			spid = "?";
 			break;
 	}

 	out += sprintf(out, "MaxLen=%x DT%d EndPt=%x Dev=%x, PID=%x(%s) ",
 		token >> 21,
 		((token >> 19) & 1),
 		(token >> 15) & 15,
 		(token >> 8) & 127,
 		(token & 0xff),
 		spid);
 	out += sprintf(out, "(buf=%08x)\n", le32_to_cpu(td->buffer));

 	return out - buf;
 }

 static int uhci_show_urbp(struct urb_priv *urbp, char *buf, int len, int space)
 {
 	char *out = buf;
 	struct uhci_td *td;
 	int i, nactive, ninactive;
 	char *ptype;

 	if (len < 200)
 		return 0;

 	out += sprintf(out, "urb_priv [%p] ", urbp);
 	out += sprintf(out, "urb [%p] ", urbp->urb);
 	out += sprintf(out, "qh [%p] ", urbp->qh);
 	out += sprintf(out, "Dev=%d ", usb_pipedevice(urbp->urb->pipe));
 	out += sprintf(out, "EP=%x(%s) ", usb_pipeendpoint(urbp->urb->pipe),
 			(usb_pipein(urbp->urb->pipe) ? "IN" : "OUT"));

 	switch (usb_pipetype(urbp->urb->pipe)) {
 	case PIPE_ISOCHRONOUS: ptype = "ISO"; break;
 	case PIPE_INTERRUPT: ptype = "INT"; break;
 	case PIPE_BULK: ptype = "BLK"; break;
 	default:
 	case PIPE_CONTROL: ptype = "CTL"; break;
 	}

 	out += sprintf(out, "%s%s", ptype, (urbp->fsbr ? " FSBR" : ""));
 	out += sprintf(out, " Actlen=%d", urbp->urb->actual_length);

 	if (urbp->urb->status != -EINPROGRESS)
 		out += sprintf(out, " Status=%d", urbp->urb->status);
 	out += sprintf(out, "\n");

 	i = nactive = ninactive = 0;
 	list_for_each_entry(td, &urbp->td_list, list) {
 		if (++i <= 10 || debug > 2) {
 			out += sprintf(out, "%*s%d: ", space + 2, "", i);
 			out += uhci_show_td(td, out, len - (out - buf), 0);
 		} else {
 			if (td_status(td) & TD_CTRL_ACTIVE)
 				++nactive;
 			else
 				++ninactive;
 		}
 	}
 	if (nactive + ninactive > 0)
 		out += sprintf(out, "%*s[skipped %d inactive and %d active "
 				"TDs]\n",
 				space, "", ninactive, nactive);

 	return out - buf;
 }

 static int uhci_show_qh(struct uhci_qh *qh, char *buf, int len, int space)
 {
 	char *out = buf;
 	int i, nurbs;
 	__le32 element = qh_element(qh);
 	char *qtype;

 	/* Try to make sure there's enough memory */
 	if (len < 80 * 6)
 		return 0;

 	switch (qh->type) {
 	case USB_ENDPOINT_XFER_ISOC: qtype = "ISO"; break;
 	case USB_ENDPOINT_XFER_INT: qtype = "INT"; break;
 	case USB_ENDPOINT_XFER_BULK: qtype = "BLK"; break;
 	case USB_ENDPOINT_XFER_CONTROL: qtype = "CTL"; break;
 	default: qtype = "Skel" ; break;
 	}

 	out += sprintf(out, "%*s[%p] %s QH link (%08x) element (%08x)\n",
 			space, "", qh, qtype,
 			le32_to_cpu(qh->link), le32_to_cpu(element));

 	if (element & UHCI_PTR_QH)
 		out += sprintf(out, "%*s  Element points to QH (bug?)\n", space, "");

 	if (element & UHCI_PTR_DEPTH)
 		out += sprintf(out, "%*s  Depth traverse\n", space, "");

 	if (element & cpu_to_le32(8))
 		out += sprintf(out, "%*s  Bit 3 set (bug?)\n", space, "");

 	if (!(element & ~(UHCI_PTR_QH | UHCI_PTR_DEPTH)))
 		out += sprintf(out, "%*s  Element is NULL (bug?)\n", space, "");

 	if (list_empty(&qh->queue)) {
 		out += sprintf(out, "%*s  queue is empty\n", space, "");
 	} else {
 		struct urb_priv *urbp = list_entry(qh->queue.next,
 				struct urb_priv, node);
 		struct uhci_td *td = list_entry(urbp->td_list.next,
 				struct uhci_td, list);

 		if (cpu_to_le32(td->dma_handle) != (element & ~UHCI_PTR_BITS))
 			out += sprintf(out, "%*s Element != First TD\n",
 					space, "");
 		i = nurbs = 0;
 		list_for_each_entry(urbp, &qh->queue, node) {
 			if (++i <= 10)
 				out += uhci_show_urbp(urbp, out,
 						len - (out - buf), space + 2);
 			else
 				++nurbs;
 		}
 		if (nurbs > 0)
 			out += sprintf(out, "%*s Skipped %d URBs\n",
 					space, "", nurbs);
 	}

 	if (qh->udev) {
 		out += sprintf(out, "%*s  Dummy TD\n", space, "");
 		out += uhci_show_td(qh->dummy_td, out, len - (out - buf), 0);
 	}

 	return out - buf;
 }

 static const char * const qh_names[] = {
   "skel_unlink_qh", "skel_iso_qh",
   "skel_int128_qh", "skel_int64_qh",
   "skel_int32_qh", "skel_int16_qh",
   "skel_int8_qh", "skel_int4_qh",
   "skel_int2_qh", "skel_int1_qh",
   "skel_ls_control_qh", "skel_fs_control_qh",
   "skel_bulk_qh", "skel_term_qh"
 };

 static int uhci_show_sc(int port, unsigned short status, char *buf, int len)
 {
 	char *out = buf;

 	/* Try to make sure there's enough memory */
 	if (len < 160)
 		return 0;

 	out += sprintf(out, "  stat%d     =     %04x  %s%s%s%s%s%s%s%s%s%s\n",
 		port,
 		status,
 		(status & USBPORTSC_SUSP) ?	" Suspend" : "",
 		(status & USBPORTSC_OCC) ?	" OverCurrentChange" : "",
 		(status & USBPORTSC_OC) ?	" OverCurrent" : "",
 		(status & USBPORTSC_PR) ?	" Reset" : "",
 		(status & USBPORTSC_LSDA) ?	" LowSpeed" : "",
 		(status & USBPORTSC_RD) ?	" ResumeDetect" : "",
 		(status & USBPORTSC_PEC) ?	" EnableChange" : "",
 		(status & USBPORTSC_PE) ?	" Enabled" : "",
 		(status & USBPORTSC_CSC) ?	" ConnectChange" : "",
 		(status & USBPORTSC_CCS) ?	" Connected" : "");

 	return out - buf;
 }

 static int uhci_show_root_hub_state(struct uhci_hcd *uhci, char *buf, int len)
 {
 	char *out = buf;
 	char *rh_state;

 	/* Try to make sure there's enough memory */
 	if (len < 60)
 		return 0;

 	switch (uhci->rh_state) {
 	    case UHCI_RH_RESET:
 		rh_state = "reset";		break;
 	    case UHCI_RH_SUSPENDED:
 		rh_state = "suspended";		break;
 	    case UHCI_RH_AUTO_STOPPED:
 		rh_state = "auto-stopped";	break;
 	    case UHCI_RH_RESUMING:
 		rh_state = "resuming";		break;
 	    case UHCI_RH_SUSPENDING:
 		rh_state = "suspending";	break;
 	    case UHCI_RH_RUNNING:
 		rh_state = "running";		break;
 	    case UHCI_RH_RUNNING_NODEVS:
 		rh_state = "running, no devs";	break;
 	    default:
 		rh_state = "?";			break;
 	}
 	out += sprintf(out, "Root-hub state: %s   FSBR: %d\n",
 			rh_state, uhci->fsbr_is_on);
 	return out - buf;
 }

 static int uhci_show_status(struct uhci_hcd *uhci, char *buf, int len)
 {
 	char *out = buf;
 	unsigned long io_addr = uhci->io_addr;
 	unsigned short usbcmd, usbstat, usbint, usbfrnum;
 	unsigned int flbaseadd;
 	unsigned char sof;
 	unsigned short portsc1, portsc2;

 	/* Try to make sure there's enough memory */
 	if (len < 80 * 6)
 		return 0;

 	usbcmd    = inw(io_addr + 0);
 	usbstat   = inw(io_addr + 2);
 	usbint    = inw(io_addr + 4);
 	usbfrnum  = inw(io_addr + 6);
 	flbaseadd = inl(io_addr + 8);
 	sof       = inb(io_addr + 12);
 	portsc1   = inw(io_addr + 16);
 	portsc2   = inw(io_addr + 18);

 	out += sprintf(out, "  usbcmd    =     %04x   %s%s%s%s%s%s%s%s\n",
 		usbcmd,
 		(usbcmd & USBCMD_MAXP) ?    "Maxp64 " : "Maxp32 ",
 		(usbcmd & USBCMD_CF) ?      "CF " : "",
 		(usbcmd & USBCMD_SWDBG) ?   "SWDBG " : "",
 		(usbcmd & USBCMD_FGR) ?     "FGR " : "",
 		(usbcmd & USBCMD_EGSM) ?    "EGSM " : "",
 		(usbcmd & USBCMD_GRESET) ?  "GRESET " : "",
 		(usbcmd & USBCMD_HCRESET) ? "HCRESET " : "",
 		(usbcmd & USBCMD_RS) ?      "RS " : "");

 	out += sprintf(out, "  usbstat   =     %04x   %s%s%s%s%s%s\n",
 		usbstat,
 		(usbstat & USBSTS_HCH) ?    "HCHalted " : "",
 		(usbstat & USBSTS_HCPE) ?   "HostControllerProcessError " : "",
 		(usbstat & USBSTS_HSE) ?    "HostSystemError " : "",
 		(usbstat & USBSTS_RD) ?     "ResumeDetect " : "",
 		(usbstat & USBSTS_ERROR) ?  "USBError " : "",
 		(usbstat & USBSTS_USBINT) ? "USBINT " : "");

 	out += sprintf(out, "  usbint    =     %04x\n", usbint);
 	out += sprintf(out, "  usbfrnum  =   (%d)%03x\n", (usbfrnum >> 10) & 1,
 		0xfff & (4*(unsigned int)usbfrnum));
 	out += sprintf(out, "  flbaseadd = %08x\n", flbaseadd);
 	out += sprintf(out, "  sof       =       %02x\n", sof);
 	out += uhci_show_sc(1, portsc1, out, len - (out - buf));
 	out += uhci_show_sc(2, portsc2, out, len - (out - buf));

 	return out - buf;
 }

 static int uhci_sprint_schedule(struct uhci_hcd *uhci, char *buf, int len)
 {
 	char *out = buf;
 	int i, j;
 	struct uhci_qh *qh;
 	struct uhci_td *td;
 	struct list_head *tmp, *head;

 	out += uhci_show_root_hub_state(uhci, out, len - (out - buf));
 	out += sprintf(out, "HC status\n");
 	out += uhci_show_status(uhci, out, len - (out - buf));
 	if (debug <= 1)
 		return out - buf;

 	out += sprintf(out, "Frame List\n");
 	for (i = 0; i < UHCI_NUMFRAMES; ++i) {
 		td = uhci->frame_cpu[i];
 		if (!td)
 			continue;

 		out += sprintf(out, "- Frame %d\n", i); \
 		if (td->dma_handle != (dma_addr_t)uhci->frame[i])
 			out += sprintf(out, "    frame list does not match td->dma_handle!\n");

 		head = &td->fl_list;
 		tmp = head;
 		do {
 			td = list_entry(tmp, struct uhci_td, fl_list);
 			tmp = tmp->next;
 			out += uhci_show_td(td, out, len - (out - buf), 4);
 		} while (tmp != head);
 	}

 	out += sprintf(out, "Skeleton QHs\n");

 	for (i = 0; i < UHCI_NUM_SKELQH; ++i) {
 		int cnt = 0;

 		qh = uhci->skelqh[i];
 		out += sprintf(out, "- %s\n", qh_names[i]); \
 		out += uhci_show_qh(qh, out, len - (out - buf), 4);

 		/* Last QH is the Terminating QH, it's different */
 		if (i == UHCI_NUM_SKELQH - 1) {
 			if (qh->link != UHCI_PTR_TERM)
 				out += sprintf(out, "    bandwidth reclamation on!\n");

 			if (qh_element(qh) != cpu_to_le32(uhci->term_td->dma_handle))
 				out += sprintf(out, "    skel_term_qh element is not set to term_td!\n");

 			continue;
 		}

 		j = (i < 9) ? 9 : i+1;		/* Next skeleton */
 		head = &qh->node;
 		tmp = head->next;

 		while (tmp != head) {
 			qh = list_entry(tmp, struct uhci_qh, node);
 			tmp = tmp->next;
 			if (++cnt <= 10)
 				out += uhci_show_qh(qh, out,
 						len - (out - buf), 4);
 		}
 		if ((cnt -= 10) > 0)
 			out += sprintf(out, "    Skipped %d QHs\n", cnt);

 		if (i > 1 && i < UHCI_NUM_SKELQH - 1) {
 			if (qh->link !=
 			    (cpu_to_le32(uhci->skelqh[j]->dma_handle) | UHCI_PTR_QH))
 				out += sprintf(out, "    last QH not linked to next skeleton!\n");
 		}
 	}

 	return out - buf;
 }

 #ifdef CONFIG_DEBUG_FS

 #define MAX_OUTPUT	(64 * 1024)

 struct uhci_debug {
 	int size;
 	char *data;
 };

 static int uhci_debug_open(struct inode *inode, struct file *file)
 {
 	struct uhci_hcd *uhci = inode->u.generic_ip;
 	struct uhci_debug *up;
 	int ret = -ENOMEM;
 	unsigned long flags;

 	lock_kernel();
 	up = kmalloc(sizeof(*up), GFP_KERNEL);
 	if (!up)
 		goto out;

 	up->data = kmalloc(MAX_OUTPUT, GFP_KERNEL);
 	if (!up->data) {
 		kfree(up);
 		goto out;
 	}

 	up->size = 0;
 	spin_lock_irqsave(&uhci->lock, flags);
 	if (uhci->is_initialized)
 		up->size = uhci_sprint_schedule(uhci, up->data, MAX_OUTPUT);
 	spin_unlock_irqrestore(&uhci->lock, flags);

 	file->private_data = up;

 	ret = 0;
 out:
 	unlock_kernel();
 	return ret;
 }

 static loff_t uhci_debug_lseek(struct file *file, loff_t off, int whence)
 {
 	struct uhci_debug *up;
 	loff_t new = -1;

 	lock_kernel();
 	up = file->private_data;

 	switch (whence) {
 	case 0:
 		new = off;
 		break;
 	case 1:
 		new = file->f_pos + off;
 		break;
 	}
 	if (new < 0 || new > up->size) {
 		unlock_kernel();
 		return -EINVAL;
 	}
 	unlock_kernel();
 	return (file->f_pos = new);
 }

 static ssize_t uhci_debug_read(struct file *file, char __user *buf,
 				size_t nbytes, loff_t *ppos)
 {
 	struct uhci_debug *up = file->private_data;
 	return simple_read_from_buffer(buf, nbytes, ppos, up->data, up->size);
 }

 static int uhci_debug_release(struct inode *inode, struct file *file)
 {
 	struct uhci_debug *up = file->private_data;

 	kfree(up->data);
 	kfree(up);

 	return 0;
 }

 #undef uhci_debug_operations
 static struct file_operations uhci_debug_operations = {
 	.owner =	THIS_MODULE,
 	.open =		uhci_debug_open,
 	.llseek =	uhci_debug_lseek,
 	.read =		uhci_debug_read,
 	.release =	uhci_debug_release,
 };

 #endif	/* CONFIG_DEBUG_FS */

 #else	/* DEBUG */

 static inline void lprintk(char *buf)
 {}

 static inline int uhci_show_qh(struct uhci_qh *qh, char *buf,
 		int len, int space)
 {
 	return 0;
 }

 static inline int uhci_sprint_schedule(struct uhci_hcd *uhci,
 		char *buf, int len)
 {
 	return 0;
 }

 #endif
	/*
	* UHCI-specific debugging code. Invaluable when something
	* goes wrong, but don't get in my face.
	*
	* Kernel visible pointers are surrounded in []s and bus
	* visible pointers are surrounded in ()s
	*
	* (C) Copyright 1999 Linus Torvalds
	* (C) Copyright 1999-2001 Johannes Erdfelt
	*/

	#include <linux/config.h>
	#include <linux/kernel.h>
	#include <linux/debugfs.h>
	#include <linux/smp_lock.h>
	#include <asm/io.h>

	#include "uhci-hcd.h"

	#define uhci_debug_operations (* (struct file_operations *) NULL)
	static struct dentry *uhci_debugfs_root;

	#ifdef DEBUG

	/* Handle REALLY large printks so we don't overflow buffers */
	static void lprintk(char *buf)
	{
	char *p;

	/* Just write one line at a time */
	while (buf) {
	p = strchr(buf, '\n');
	if (p)
	*p = 0;
	printk(KERN_DEBUG "%s\n", buf);
	buf = p;
	if (buf)
	buf++;
	}
	}

	static int uhci_show_td(struct uhci_td td, char buf, int len, int space)
	{
	char *out = buf;
	char *spid;
	u32 status, token;

	/* Try to make sure there's enough memory */
	if (len < 160)
	return 0;

	status = td_status(td);
	out += sprintf(out, "%*s[%p] link (%08x) ", space, "", td, le32_to_cpu(td->link));
	out += sprintf(out, "e%d %s%s%s%s%s%s%s%s%s%sLength=%x ",
	((status >> 27) & 3),
	(status & TD_CTRL_SPD) ? "SPD " : "",
	(status & TD_CTRL_LS) ? "LS " : "",
	(status & TD_CTRL_IOC) ? "IOC " : "",
	(status & TD_CTRL_ACTIVE) ? "Active " : "",
	(status & TD_CTRL_STALLED) ? "Stalled " : "",
	(status & TD_CTRL_DBUFERR) ? "DataBufErr " : "",
	(status & TD_CTRL_BABBLE) ? "Babble " : "",
	(status & TD_CTRL_NAK) ? "NAK " : "",
	(status & TD_CTRL_CRCTIMEO) ? "CRC/Timeo " : "",
	(status & TD_CTRL_BITSTUFF) ? "BitStuff " : "",
	status & 0x7ff);

	token = td_token(td);
	switch (uhci_packetid(token)) {
	case USB_PID_SETUP:
	spid = "SETUP";
	break;
	case USB_PID_OUT:
	spid = "OUT";
	break;
	case USB_PID_IN:
	spid = "IN";
	break;
	default:
	spid = "?";
	break;
	}

	out += sprintf(out, "MaxLen=%x DT%d EndPt=%x Dev=%x, PID=%x(%s) ",
	token >> 21,
	((token >> 19) & 1),
	(token >> 15) & 15,
	(token >> 8) & 127,
	(token & 0xff),
	spid);
	out += sprintf(out, "(buf=%08x)\n", le32_to_cpu(td->buffer));

	return out - buf;
	}

	static int uhci_show_urbp(struct urb_priv urbp, char buf, int len, int space)
	{
	char *out = buf;
	struct uhci_td *td;
	int i, nactive, ninactive;
	char *ptype;

	if (len < 200)
	return 0;

	out += sprintf(out, "urb_priv [%p] ", urbp);
	out += sprintf(out, "urb [%p] ", urbp->urb);
	out += sprintf(out, "qh [%p] ", urbp->qh);
	out += sprintf(out, "Dev=%d ", usb_pipedevice(urbp->urb->pipe));
	out += sprintf(out, "EP=%x(%s) ", usb_pipeendpoint(urbp->urb->pipe),
	(usb_pipein(urbp->urb->pipe) ? "IN" : "OUT"));

	switch (usb_pipetype(urbp->urb->pipe)) {
	case PIPE_ISOCHRONOUS: ptype = "ISO"; break;
	case PIPE_INTERRUPT: ptype = "INT"; break;
	case PIPE_BULK: ptype = "BLK"; break;
	default:
	case PIPE_CONTROL: ptype = "CTL"; break;
	}

	out += sprintf(out, "%s%s", ptype, (urbp->fsbr ? " FSBR" : ""));
	out += sprintf(out, " Actlen=%d", urbp->urb->actual_length);

	if (urbp->urb->status != -EINPROGRESS)
	out += sprintf(out, " Status=%d", urbp->urb->status);
	out += sprintf(out, "\n");

	i = nactive = ninactive = 0;
	list_for_each_entry(td, &urbp->td_list, list) {
	if (++i <= 10 \|\| debug > 2) {
	out += sprintf(out, "%*s%d: ", space + 2, "", i);
	out += uhci_show_td(td, out, len - (out - buf), 0);
	} else {
	if (td_status(td) & TD_CTRL_ACTIVE)
	++nactive;
	else
	++ninactive;
	}
	}
	if (nactive + ninactive > 0)
	out += sprintf(out, "%*s[skipped %d inactive and %d active "
	"TDs]\n",
	space, "", ninactive, nactive);

	return out - buf;
	}

	static int uhci_show_qh(struct uhci_qh qh, char buf, int len, int space)
	{
	char *out = buf;
	int i, nurbs;
	__le32 element = qh_element(qh);
	char *qtype;

	/* Try to make sure there's enough memory */
	if (len < 80 * 6)
	return 0;

	switch (qh->type) {
	case USB_ENDPOINT_XFER_ISOC: qtype = "ISO"; break;
	case USB_ENDPOINT_XFER_INT: qtype = "INT"; break;
	case USB_ENDPOINT_XFER_BULK: qtype = "BLK"; break;
	case USB_ENDPOINT_XFER_CONTROL: qtype = "CTL"; break;
	default: qtype = "Skel" ; break;
	}

	out += sprintf(out, "%*s[%p] %s QH link (%08x) element (%08x)\n",
	space, "", qh, qtype,
	le32_to_cpu(qh->link), le32_to_cpu(element));

	if (element & UHCI_PTR_QH)
	out += sprintf(out, "%*s Element points to QH (bug?)\n", space, "");

	if (element & UHCI_PTR_DEPTH)
	out += sprintf(out, "%*s Depth traverse\n", space, "");

	if (element & cpu_to_le32(8))
	out += sprintf(out, "%*s Bit 3 set (bug?)\n", space, "");

	if (!(element & ~(UHCI_PTR_QH \| UHCI_PTR_DEPTH)))
	out += sprintf(out, "%*s Element is NULL (bug?)\n", space, "");

	if (list_empty(&qh->queue)) {
	out += sprintf(out, "%*s queue is empty\n", space, "");
	} else {
	struct urb_priv *urbp = list_entry(qh->queue.next,
	struct urb_priv, node);
	struct uhci_td *td = list_entry(urbp->td_list.next,
	struct uhci_td, list);

	if (cpu_to_le32(td->dma_handle) != (element & ~UHCI_PTR_BITS))
	out += sprintf(out, "%*s Element != First TD\n",
	space, "");
	i = nurbs = 0;
	list_for_each_entry(urbp, &qh->queue, node) {
	if (++i <= 10)
	out += uhci_show_urbp(urbp, out,
	len - (out - buf), space + 2);
	else
	++nurbs;
	}
	if (nurbs > 0)
	out += sprintf(out, "%*s Skipped %d URBs\n",
	space, "", nurbs);
	}

	if (qh->udev) {
	out += sprintf(out, "%*s Dummy TD\n", space, "");
	out += uhci_show_td(qh->dummy_td, out, len - (out - buf), 0);
	}

	return out - buf;
	}

	static const char * const qh_names[] = {
	"skel_unlink_qh", "skel_iso_qh",
	"skel_int128_qh", "skel_int64_qh",
	"skel_int32_qh", "skel_int16_qh",
	"skel_int8_qh", "skel_int4_qh",
	"skel_int2_qh", "skel_int1_qh",
	"skel_ls_control_qh", "skel_fs_control_qh",
	"skel_bulk_qh", "skel_term_qh"
	};

	static int uhci_show_sc(int port, unsigned short status, char *buf, int len)
	{
	char *out = buf;

	/* Try to make sure there's enough memory */
	if (len < 160)
	return 0;

	out += sprintf(out, " stat%d = %04x %s%s%s%s%s%s%s%s%s%s\n",
	port,
	status,
	(status & USBPORTSC_SUSP) ? " Suspend" : "",
	(status & USBPORTSC_OCC) ? " OverCurrentChange" : "",
	(status & USBPORTSC_OC) ? " OverCurrent" : "",
	(status & USBPORTSC_PR) ? " Reset" : "",
	(status & USBPORTSC_LSDA) ? " LowSpeed" : "",
	(status & USBPORTSC_RD) ? " ResumeDetect" : "",
	(status & USBPORTSC_PEC) ? " EnableChange" : "",
	(status & USBPORTSC_PE) ? " Enabled" : "",
	(status & USBPORTSC_CSC) ? " ConnectChange" : "",
	(status & USBPORTSC_CCS) ? " Connected" : "");

	return out - buf;
	}

	static int uhci_show_root_hub_state(struct uhci_hcd uhci, char buf, int len)
	{
	char *out = buf;
	char *rh_state;

	/* Try to make sure there's enough memory */
	if (len < 60)
	return 0;

	switch (uhci->rh_state) {
	case UHCI_RH_RESET:
	rh_state = "reset"; break;
	case UHCI_RH_SUSPENDED:
	rh_state = "suspended"; break;
	case UHCI_RH_AUTO_STOPPED:
	rh_state = "auto-stopped"; break;
	case UHCI_RH_RESUMING:
	rh_state = "resuming"; break;
	case UHCI_RH_SUSPENDING:
	rh_state = "suspending"; break;
	case UHCI_RH_RUNNING:
	rh_state = "running"; break;
	case UHCI_RH_RUNNING_NODEVS:
	rh_state = "running, no devs"; break;
	default:
	rh_state = "?"; break;
	}
	out += sprintf(out, "Root-hub state: %s FSBR: %d\n",
	rh_state, uhci->fsbr_is_on);
	return out - buf;
	}

	static int uhci_show_status(struct uhci_hcd uhci, char buf, int len)
	{
	char *out = buf;
	unsigned long io_addr = uhci->io_addr;
	unsigned short usbcmd, usbstat, usbint, usbfrnum;
	unsigned int flbaseadd;
	unsigned char sof;
	unsigned short portsc1, portsc2;

	/* Try to make sure there's enough memory */
	if (len < 80 * 6)
	return 0;

	usbcmd = inw(io_addr + 0);
	usbstat = inw(io_addr + 2);
	usbint = inw(io_addr + 4);
	usbfrnum = inw(io_addr + 6);
	flbaseadd = inl(io_addr + 8);
	sof = inb(io_addr + 12);
	portsc1 = inw(io_addr + 16);
	portsc2 = inw(io_addr + 18);

	out += sprintf(out, " usbcmd = %04x %s%s%s%s%s%s%s%s\n",
	usbcmd,
	(usbcmd & USBCMD_MAXP) ? "Maxp64 " : "Maxp32 ",
	(usbcmd & USBCMD_CF) ? "CF " : "",
	(usbcmd & USBCMD_SWDBG) ? "SWDBG " : "",
	(usbcmd & USBCMD_FGR) ? "FGR " : "",
	(usbcmd & USBCMD_EGSM) ? "EGSM " : "",
	(usbcmd & USBCMD_GRESET) ? "GRESET " : "",
	(usbcmd & USBCMD_HCRESET) ? "HCRESET " : "",
	(usbcmd & USBCMD_RS) ? "RS " : "");

	out += sprintf(out, " usbstat = %04x %s%s%s%s%s%s\n",
	usbstat,
	(usbstat & USBSTS_HCH) ? "HCHalted " : "",
	(usbstat & USBSTS_HCPE) ? "HostControllerProcessError " : "",
	(usbstat & USBSTS_HSE) ? "HostSystemError " : "",
	(usbstat & USBSTS_RD) ? "ResumeDetect " : "",
	(usbstat & USBSTS_ERROR) ? "USBError " : "",
	(usbstat & USBSTS_USBINT) ? "USBINT " : "");

	out += sprintf(out, " usbint = %04x\n", usbint);
	out += sprintf(out, " usbfrnum = (%d)%03x\n", (usbfrnum >> 10) & 1,
	0xfff & (4*(unsigned int)usbfrnum));
	out += sprintf(out, " flbaseadd = %08x\n", flbaseadd);
	out += sprintf(out, " sof = %02x\n", sof);
	out += uhci_show_sc(1, portsc1, out, len - (out - buf));
	out += uhci_show_sc(2, portsc2, out, len - (out - buf));

	return out - buf;
	}

	static int uhci_sprint_schedule(struct uhci_hcd uhci, char buf, int len)
	{
	char *out = buf;
	int i, j;
	struct uhci_qh *qh;
	struct uhci_td *td;
	struct list_head tmp, head;

	out += uhci_show_root_hub_state(uhci, out, len - (out - buf));
	out += sprintf(out, "HC status\n");
	out += uhci_show_status(uhci, out, len - (out - buf));
	if (debug <= 1)
	return out - buf;

	out += sprintf(out, "Frame List\n");
	for (i = 0; i < UHCI_NUMFRAMES; ++i) {
	td = uhci->frame_cpu[i];
	if (!td)
	continue;

	out += sprintf(out, "- Frame %d\n", i); \
	if (td->dma_handle != (dma_addr_t)uhci->frame[i])
	out += sprintf(out, " frame list does not match td->dma_handle!\n");

	head = &td->fl_list;
	tmp = head;
	do {
	td = list_entry(tmp, struct uhci_td, fl_list);
	tmp = tmp->next;
	out += uhci_show_td(td, out, len - (out - buf), 4);
	} while (tmp != head);
	}

	out += sprintf(out, "Skeleton QHs\n");

	for (i = 0; i < UHCI_NUM_SKELQH; ++i) {
	int cnt = 0;

	qh = uhci->skelqh[i];
	out += sprintf(out, "- %s\n", qh_names[i]); \
	out += uhci_show_qh(qh, out, len - (out - buf), 4);

	/* Last QH is the Terminating QH, it's different */
	if (i == UHCI_NUM_SKELQH - 1) {
	if (qh->link != UHCI_PTR_TERM)
	out += sprintf(out, " bandwidth reclamation on!\n");

	if (qh_element(qh) != cpu_to_le32(uhci->term_td->dma_handle))
	out += sprintf(out, " skel_term_qh element is not set to term_td!\n");

	continue;
	}

	j = (i < 9) ? 9 : i+1; /* Next skeleton */
	head = &qh->node;
	tmp = head->next;

	while (tmp != head) {
	qh = list_entry(tmp, struct uhci_qh, node);
	tmp = tmp->next;
	if (++cnt <= 10)
	out += uhci_show_qh(qh, out,
	len - (out - buf), 4);
	}
	if ((cnt -= 10) > 0)
	out += sprintf(out, " Skipped %d QHs\n", cnt);

	if (i > 1 && i < UHCI_NUM_SKELQH - 1) {
	if (qh->link !=
	(cpu_to_le32(uhci->skelqh[j]->dma_handle) \| UHCI_PTR_QH))
	out += sprintf(out, " last QH not linked to next skeleton!\n");
	}
	}

	return out - buf;
	}

	#ifdef CONFIG_DEBUG_FS

	#define MAX_OUTPUT (64 * 1024)

	struct uhci_debug {
	int size;
	char *data;
	};

	static int uhci_debug_open(struct inode inode, struct file file)
	{
	struct uhci_hcd *uhci = inode->u.generic_ip;
	struct uhci_debug *up;
	int ret = -ENOMEM;
	unsigned long flags;

	lock_kernel();
	up = kmalloc(sizeof(*up), GFP_KERNEL);
	if (!up)
	goto out;

	up->data = kmalloc(MAX_OUTPUT, GFP_KERNEL);
	if (!up->data) {
	kfree(up);
	goto out;
	}

	up->size = 0;
	spin_lock_irqsave(&uhci->lock, flags);
	if (uhci->is_initialized)
	up->size = uhci_sprint_schedule(uhci, up->data, MAX_OUTPUT);
	spin_unlock_irqrestore(&uhci->lock, flags);

	file->private_data = up;

	ret = 0;
	out:
	unlock_kernel();
	return ret;
	}

	static loff_t uhci_debug_lseek(struct file *file, loff_t off, int whence)
	{
	struct uhci_debug *up;
	loff_t new = -1;

	lock_kernel();
	up = file->private_data;

	switch (whence) {
	case 0:
	new = off;
	break;
	case 1:
	new = file->f_pos + off;
	break;
	}
	if (new < 0 \|\| new > up->size) {
	unlock_kernel();
	return -EINVAL;
	}
	unlock_kernel();
	return (file->f_pos = new);
	}

	static ssize_t uhci_debug_read(struct file file, char __user buf,
	size_t nbytes, loff_t *ppos)
	{
	struct uhci_debug *up = file->private_data;
	return simple_read_from_buffer(buf, nbytes, ppos, up->data, up->size);
	}

	static int uhci_debug_release(struct inode inode, struct file file)
	{
	struct uhci_debug *up = file->private_data;

	kfree(up->data);
	kfree(up);

	return 0;
	}

	#undef uhci_debug_operations
	static struct file_operations uhci_debug_operations = {
	.owner = THIS_MODULE,
	.open = uhci_debug_open,
	.llseek = uhci_debug_lseek,
	.read = uhci_debug_read,
	.release = uhci_debug_release,
	};

	#endif /* CONFIG_DEBUG_FS */

	#else /* DEBUG */

	static inline void lprintk(char *buf)
	{}

	static inline int uhci_show_qh(struct uhci_qh qh, char buf,
	int len, int space)
	{
	return 0;
	}

	static inline int uhci_sprint_schedule(struct uhci_hcd *uhci,
	char *buf, int len)
	{
	return 0;
	}

	#endif