USB: convert ohci debug files to use debugfs instead of sysfs
We should not have multiple line files in sysfs, this moves the data to debugfs instead, like the UHCI driver. Signed-off-by: Tony Jones <tonyj@suse.de> Cc: Kay Sievers <kay.sievers@vrfy.org> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Tony Jones
Greg Kroah-Hartman
parent
f2a383e4de
commit
684c19e0d9
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@ -401,6 +401,42 @@ static inline void remove_debug_files (struct ohci_hcd *bus) { }
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#else
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static int debug_async_open(struct inode *, struct file *);
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static int debug_periodic_open(struct inode *, struct file *);
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static int debug_registers_open(struct inode *, struct file *);
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static int debug_async_open(struct inode *, struct file *);
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static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
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static int debug_close(struct inode *, struct file *);
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static const struct file_operations debug_async_fops = {
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.owner = THIS_MODULE,
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.open = debug_async_open,
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.read = debug_output,
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.release = debug_close,
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};
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static const struct file_operations debug_periodic_fops = {
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.owner = THIS_MODULE,
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.open = debug_periodic_open,
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.read = debug_output,
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.release = debug_close,
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};
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static const struct file_operations debug_registers_fops = {
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.owner = THIS_MODULE,
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.open = debug_registers_open,
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.read = debug_output,
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.release = debug_close,
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};
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static struct dentry *ohci_debug_root;
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struct debug_buffer {
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ssize_t (*fill_func)(struct debug_buffer *); /* fill method */
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struct device *dev;
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struct mutex mutex; /* protect filling of buffer */
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size_t count; /* number of characters filled into buffer */
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char *page;
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};
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static ssize_t
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show_list (struct ohci_hcd *ohci, char *buf, size_t count, struct ed *ed)
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{
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@ -467,8 +503,7 @@ show_list (struct ohci_hcd *ohci, char *buf, size_t count, struct ed *ed)
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return count - size;
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}
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static ssize_t
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show_async(struct device *dev, struct device_attribute *attr, char *buf)
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static ssize_t fill_async_buffer(struct debug_buffer *buf)
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{
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struct usb_bus *bus;
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struct usb_hcd *hcd;
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@ -476,25 +511,23 @@ show_async(struct device *dev, struct device_attribute *attr, char *buf)
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size_t temp;
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unsigned long flags;
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bus = dev_get_drvdata(dev);
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bus = dev_get_drvdata(buf->dev);
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hcd = bus_to_hcd(bus);
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ohci = hcd_to_ohci(hcd);
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/* display control and bulk lists together, for simplicity */
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spin_lock_irqsave (&ohci->lock, flags);
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temp = show_list (ohci, buf, PAGE_SIZE, ohci->ed_controltail);
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temp += show_list (ohci, buf + temp, PAGE_SIZE - temp, ohci->ed_bulktail);
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temp = show_list(ohci, buf->page, buf->count, ohci->ed_controltail);
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temp += show_list(ohci, buf->page + temp, buf->count - temp,
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ohci->ed_bulktail);
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spin_unlock_irqrestore (&ohci->lock, flags);
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return temp;
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}
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static DEVICE_ATTR(async, S_IRUGO, show_async, NULL);
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#define DBG_SCHED_LIMIT 64
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static ssize_t
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show_periodic(struct device *dev, struct device_attribute *attr, char *buf)
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static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
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{
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struct usb_bus *bus;
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struct usb_hcd *hcd;
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@ -509,10 +542,10 @@ show_periodic(struct device *dev, struct device_attribute *attr, char *buf)
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return 0;
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seen_count = 0;
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bus = dev_get_drvdata(dev);
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bus = (struct usb_bus *)dev_get_drvdata(buf->dev);
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hcd = bus_to_hcd(bus);
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ohci = hcd_to_ohci(hcd);
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next = buf;
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next = buf->page;
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size = PAGE_SIZE;
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temp = scnprintf (next, size, "size = %d\n", NUM_INTS);
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@ -589,13 +622,9 @@ show_periodic(struct device *dev, struct device_attribute *attr, char *buf)
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return PAGE_SIZE - size;
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}
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static DEVICE_ATTR(periodic, S_IRUGO, show_periodic, NULL);
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#undef DBG_SCHED_LIMIT
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static ssize_t
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show_registers(struct device *dev, struct device_attribute *attr, char *buf)
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static ssize_t fill_registers_buffer(struct debug_buffer *buf)
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{
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struct usb_bus *bus;
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struct usb_hcd *hcd;
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@ -606,11 +635,11 @@ show_registers(struct device *dev, struct device_attribute *attr, char *buf)
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char *next;
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u32 rdata;
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bus = dev_get_drvdata(dev);
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bus = (struct usb_bus *)dev_get_drvdata(buf->dev);
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hcd = bus_to_hcd(bus);
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ohci = hcd_to_ohci(hcd);
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regs = ohci->regs;
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next = buf;
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next = buf->page;
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size = PAGE_SIZE;
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spin_lock_irqsave (&ohci->lock, flags);
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@ -677,29 +706,155 @@ show_registers(struct device *dev, struct device_attribute *attr, char *buf)
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done:
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spin_unlock_irqrestore (&ohci->lock, flags);
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return PAGE_SIZE - size;
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}
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static DEVICE_ATTR(registers, S_IRUGO, show_registers, NULL);
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static struct debug_buffer *alloc_buffer(struct device *dev,
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ssize_t (*fill_func)(struct debug_buffer *))
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{
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struct debug_buffer *buf;
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buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
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if (buf) {
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buf->dev = dev;
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buf->fill_func = fill_func;
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mutex_init(&buf->mutex);
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}
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return buf;
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}
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static int fill_buffer(struct debug_buffer *buf)
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{
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int ret = 0;
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if (!buf->page)
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buf->page = (char *)get_zeroed_page(GFP_KERNEL);
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if (!buf->page) {
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ret = -ENOMEM;
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goto out;
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}
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ret = buf->fill_func(buf);
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if (ret >= 0) {
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buf->count = ret;
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ret = 0;
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}
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out:
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return ret;
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}
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static ssize_t debug_output(struct file *file, char __user *user_buf,
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size_t len, loff_t *offset)
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{
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struct debug_buffer *buf = file->private_data;
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int ret = 0;
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mutex_lock(&buf->mutex);
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if (buf->count == 0) {
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ret = fill_buffer(buf);
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if (ret != 0) {
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mutex_unlock(&buf->mutex);
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goto out;
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}
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}
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mutex_unlock(&buf->mutex);
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ret = simple_read_from_buffer(user_buf, len, offset,
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buf->page, buf->count);
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out:
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return ret;
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}
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static int debug_close(struct inode *inode, struct file *file)
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{
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struct debug_buffer *buf = file->private_data;
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if (buf) {
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if (buf->page)
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free_page((unsigned long)buf->page);
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kfree(buf);
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}
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return 0;
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}
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static int debug_async_open(struct inode *inode, struct file *file)
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{
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file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
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return file->private_data ? 0 : -ENOMEM;
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}
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static int debug_periodic_open(struct inode *inode, struct file *file)
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{
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file->private_data = alloc_buffer(inode->i_private,
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fill_periodic_buffer);
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return file->private_data ? 0 : -ENOMEM;
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}
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static int debug_registers_open(struct inode *inode, struct file *file)
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{
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file->private_data = alloc_buffer(inode->i_private,
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fill_registers_buffer);
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return file->private_data ? 0 : -ENOMEM;
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}
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static inline void create_debug_files (struct ohci_hcd *ohci)
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{
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struct device *dev = ohci_to_hcd(ohci)->self.dev;
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int retval;
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struct usb_bus *bus = &ohci_to_hcd(ohci)->self;
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struct device *dev = bus->dev;
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ohci->debug_dir = debugfs_create_dir(bus->bus_name, ohci_debug_root);
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if (!ohci->debug_dir)
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goto dir_error;
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ohci->debug_async = debugfs_create_file("async", S_IRUGO,
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ohci->debug_dir, dev,
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&debug_async_fops);
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if (!ohci->debug_async)
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goto async_error;
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ohci->debug_periodic = debugfs_create_file("periodic", S_IRUGO,
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ohci->debug_dir, dev,
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&debug_periodic_fops);
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if (!ohci->debug_periodic)
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goto periodic_error;
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ohci->debug_registers = debugfs_create_file("registers", S_IRUGO,
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ohci->debug_dir, dev,
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&debug_registers_fops);
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if (!ohci->debug_registers)
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goto registers_error;
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retval = device_create_file(dev, &dev_attr_async);
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retval = device_create_file(dev, &dev_attr_periodic);
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retval = device_create_file(dev, &dev_attr_registers);
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ohci_dbg (ohci, "created debug files\n");
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return;
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registers_error:
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debugfs_remove(ohci->debug_periodic);
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periodic_error:
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debugfs_remove(ohci->debug_async);
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async_error:
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debugfs_remove(ohci->debug_dir);
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dir_error:
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ohci->debug_periodic = NULL;
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ohci->debug_async = NULL;
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ohci->debug_dir = NULL;
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}
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static inline void remove_debug_files (struct ohci_hcd *ohci)
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{
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struct device *dev = ohci_to_hcd(ohci)->self.dev;
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device_remove_file(dev, &dev_attr_async);
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device_remove_file(dev, &dev_attr_periodic);
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device_remove_file(dev, &dev_attr_registers);
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debugfs_remove(ohci->debug_registers);
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debugfs_remove(ohci->debug_periodic);
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debugfs_remove(ohci->debug_async);
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debugfs_remove(ohci->debug_dir);
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}
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#endif
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@ -36,6 +36,7 @@
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#include <linux/dmapool.h>
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#include <linux/reboot.h>
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#include <linux/workqueue.h>
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#include <linux/debugfs.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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@ -1068,6 +1069,14 @@ static int __init ohci_hcd_mod_init(void)
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pr_debug ("%s: block sizes: ed %Zd td %Zd\n", hcd_name,
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sizeof (struct ed), sizeof (struct td));
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#ifdef DEBUG
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ohci_debug_root = debugfs_create_dir("ohci", NULL);
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if (!ohci_debug_root) {
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retval = -ENOENT;
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goto error_debug;
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}
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#endif
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#ifdef PS3_SYSTEM_BUS_DRIVER
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retval = ps3_ohci_driver_register(&PS3_SYSTEM_BUS_DRIVER);
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if (retval < 0)
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@ -1130,6 +1139,12 @@ static int __init ohci_hcd_mod_init(void)
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ps3_ohci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
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error_ps3:
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#endif
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#ifdef DEBUG
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debugfs_remove(ohci_debug_root);
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ohci_debug_root = NULL;
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error_debug:
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#endif
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return retval;
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}
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module_init(ohci_hcd_mod_init);
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@ -1154,6 +1169,9 @@ static void __exit ohci_hcd_mod_exit(void)
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#ifdef PS3_SYSTEM_BUS_DRIVER
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ps3_ohci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
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#endif
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#ifdef DEBUG
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debugfs_remove(ohci_debug_root);
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#endif
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}
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module_exit(ohci_hcd_mod_exit);
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@ -408,6 +408,13 @@ struct ohci_hcd {
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unsigned eds_scheduled;
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struct ed *ed_to_check;
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unsigned zf_delay;
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#ifdef DEBUG
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struct dentry *debug_dir;
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struct dentry *debug_async;
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struct dentry *debug_periodic;
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struct dentry *debug_registers;
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#endif
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};
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#ifdef CONFIG_PCI
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