[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: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
parent
0ed8fee1c1
commit
8d402e1ae0
|
@ -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
|
||||
|
|
|
@ -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);
|
||||
|
|
|
@ -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 */
|
||||
|
|
|
@ -736,7 +736,6 @@ err:
|
|||
if (errbuf) {
|
||||
/* Print the chain for debugging purposes */
|
||||
uhci_show_qh(urbp->qh, errbuf, ERRBUF_LEN, 0);
|
||||
|
||||
lprintk(errbuf);
|
||||
}
|
||||
}
|
||||
|
@ -924,26 +923,17 @@ td_error:
|
|||
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;
|
||||
|
|
Loading…
Reference in New Issue