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Commit 8d402e1a authored by Alan Stern's avatar Alan Stern Committed by Greg Kroah-Hartman
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[PATCH] UHCI: improve debugging code 



This patch (as626) makes some improvements to the debugging code in
uhci-hcd.  The main change is that now the code won't get compiled if
CONFIG_USB_DEBUG isn't set.  But there are other changes too, like
adding a missing .owner field and printing a debugging dump if the
controller dies.

Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 0ed8fee1

drivers/usb/host/uhci-debug.c

+29 −7
Original line number Diff line number Diff line
@@ -17,10 +17,13 @@ 


#include "uhci-hcd.h"



static struct dentry *uhci_debugfs_root = NULL;

#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 inline void lprintk(char *buf)

static void lprintk(char *buf)

{

	char *p;
@@ -196,7 +199,6 @@ static int uhci_show_qh(struct uhci_qh *qh, char *buf, int len, int space) 
	return out - buf;

}



#ifdef CONFIG_PROC_FS

static const char * const qh_names[] = {

  "skel_unlink_qh", "skel_iso_qh",

  "skel_int128_qh", "skel_int64_qh",
@@ -393,12 +395,13 @@ static int uhci_sprint_schedule(struct uhci_hcd *uhci, char *buf, int len) 
	return out - buf;

}



#ifdef CONFIG_DEBUG_FS



#define MAX_OUTPUT	(64 * 1024)



struct uhci_debug {

	int size;

	char *data;

	struct uhci_hcd *uhci;

};



static int uhci_debug_open(struct inode *inode, struct file *file)
@@ -419,7 +422,9 @@ static int uhci_debug_open(struct inode *inode, struct file *file) 
		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);
@@ -472,15 +477,32 @@ static int uhci_debug_release(struct inode *inode, struct file *file) 
	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,

};



#else	/* CONFIG_DEBUG_FS */

#endif	/* CONFIG_DEBUG_FS */



#define uhci_debug_operations (* (struct file_operations *) NULL)

#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

drivers/usb/host/uhci-hcd.c

+39 −21
Original line number Diff line number Diff line
@@ -68,12 +68,16 @@ Alan Stern" 
 * debug = 3, show all TDs in URBs when dumping

 */

#ifdef DEBUG

#define DEBUG_CONFIGURED	1

static int debug = 1;

#else

static int debug = 0;

#endif

module_param(debug, int, S_IRUGO | S_IWUSR);

MODULE_PARM_DESC(debug, "Debug level");



#else

#define DEBUG_CONFIGURED	0

#define debug			0

#endif



static char *errbuf;

#define ERRBUF_LEN    (32 * 1024)
@@ -338,6 +342,12 @@ static irqreturn_t uhci_irq(struct usb_hcd *hcd, struct pt_regs *regs) 
				dev_err(uhci_dev(uhci),

					"host controller halted, "

					"very bad!\n");

				if (debug > 1 && errbuf) {

					/* Print the schedule for debugging */

					uhci_sprint_schedule(uhci,

							errbuf, ERRBUF_LEN);

					lprintk(errbuf);

				}

				hc_died(uhci);



				/* Force a callback in case there are
@@ -376,6 +386,14 @@ static void release_uhci(struct uhci_hcd *uhci) 
{

	int i;



	if (DEBUG_CONFIGURED) {

		spin_lock_irq(&uhci->lock);

		uhci->is_initialized = 0;

		spin_unlock_irq(&uhci->lock);



		debugfs_remove(uhci->dentry);

	}



	for (i = 0; i < UHCI_NUM_SKELQH; i++)

		uhci_free_qh(uhci, uhci->skelqh[i]);
@@ -390,8 +408,6 @@ static void release_uhci(struct uhci_hcd *uhci) 
	dma_free_coherent(uhci_dev(uhci),

			UHCI_NUMFRAMES * sizeof(*uhci->frame),

			uhci->frame, uhci->frame_dma_handle);



	debugfs_remove(uhci->dentry);

}



static int uhci_reset(struct usb_hcd *hcd)
@@ -474,17 +490,6 @@ static int uhci_start(struct usb_hcd *hcd) 


	hcd->uses_new_polling = 1;



	dentry = debugfs_create_file(hcd->self.bus_name,

			S_IFREG|S_IRUGO|S_IWUSR, uhci_debugfs_root, uhci,

			&uhci_debug_operations);

	if (!dentry) {

		dev_err(uhci_dev(uhci),

				"couldn't create uhci debugfs entry\n");

		retval = -ENOMEM;

		goto err_create_debug_entry;

	}

	uhci->dentry = dentry;



	uhci->fsbr = 0;

	uhci->fsbrtimeout = 0;
@@ -495,6 +500,19 @@ static int uhci_start(struct usb_hcd *hcd) 


	init_waitqueue_head(&uhci->waitqh);



	if (DEBUG_CONFIGURED) {

		dentry = debugfs_create_file(hcd->self.bus_name,

				S_IFREG|S_IRUGO|S_IWUSR, uhci_debugfs_root,

				uhci, &uhci_debug_operations);

		if (!dentry) {

			dev_err(uhci_dev(uhci), "couldn't create uhci "

					"debugfs entry\n");

			retval = -ENOMEM;

			goto err_create_debug_entry;

		}

		uhci->dentry = dentry;

	}



	uhci->frame = dma_alloc_coherent(uhci_dev(uhci),

			UHCI_NUMFRAMES * sizeof(*uhci->frame),

			&uhci->frame_dma_handle, 0);
@@ -609,6 +627,7 @@ static int uhci_start(struct usb_hcd *hcd) 
	mb();



	configure_hc(uhci);

	uhci->is_initialized = 1;

	start_rh(uhci);

	return 0;
@@ -872,15 +891,14 @@ static int __init uhci_hcd_init(void) 
	if (usb_disabled())

		return -ENODEV;



	if (debug) {

	if (DEBUG_CONFIGURED) {

		errbuf = kmalloc(ERRBUF_LEN, GFP_KERNEL);

		if (!errbuf)

			goto errbuf_failed;

	}



		uhci_debugfs_root = debugfs_create_dir("uhci", NULL);

		if (!uhci_debugfs_root)

			goto debug_failed;

	}



	uhci_up_cachep = kmem_cache_create("uhci_urb_priv",

		sizeof(struct urb_priv), 0, 0, NULL, NULL);

drivers/usb/host/uhci-hcd.h

+1 −0
Original line number Diff line number Diff line
@@ -411,6 +411,7 @@ struct uhci_hcd { 
	unsigned int hc_inaccessible:1;		/* HC is suspended or dead */

	unsigned int working_RD:1;		/* Suspended root hub doesn't

						   need to be polled */

	unsigned int is_initialized:1;		/* Data structure is usable */



	/* Support for port suspend/resume/reset */

	unsigned long port_c_suspend;		/* Bit-arrays of ports */

drivers/usb/host/uhci-q.c

+1 −11
Original line number Diff line number Diff line
@@ -736,7 +736,6 @@ static int uhci_result_control(struct uhci_hcd *uhci, struct urb *urb) 
		if (errbuf) {

			/* Print the chain for debugging purposes */

			uhci_show_qh(urbp->qh, errbuf, ERRBUF_LEN, 0);



			lprintk(errbuf);

		}

	}
@@ -924,26 +923,17 @@ static int uhci_result_common(struct uhci_hcd *uhci, struct urb *urb) 
	ret = uhci_map_status(status, uhci_packetout(td_token(td)));



err:

	/* 

	 * Enable this chunk of code if you want to see some more debugging.

	 * But be careful, it has the tendancy to starve out khubd and prevent

	 * disconnects from happening successfully if you have a slow debug

	 * log interface (like a serial console.

	 */

#if 0

	if ((debug == 1 && ret != -EPIPE) || debug > 1) {

		/* Some debugging code */

		dev_dbg(uhci_dev(uhci), "%s: failed with status %x\n",

				__FUNCTION__, status);



		if (errbuf) {

		if (debug > 1 && errbuf) {

			/* Print the chain for debugging purposes */

			uhci_show_qh(urbp->qh, errbuf, ERRBUF_LEN, 0);



			lprintk(errbuf);

		}

	}

#endif



	/* Note that the queue has stopped and save the next toggle value */

	urbp->qh->element = UHCI_PTR_TERM;