#else
-/* troubleshooting help: expose state in sysfs */
+/* troubleshooting help: expose state in debugfs */
+
+static int debug_async_open(struct inode *, struct file *);
+static int debug_periodic_open(struct inode *, struct file *);
+static int debug_registers_open(struct inode *, struct file *);
+static int debug_async_open(struct inode *, struct file *);
+static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
+static int debug_close(struct inode *, struct file *);
+
+static const struct file_operations debug_async_fops = {
+ .owner = THIS_MODULE,
+ .open = debug_async_open,
+ .read = debug_output,
+ .release = debug_close,
+};
+static const struct file_operations debug_periodic_fops = {
+ .owner = THIS_MODULE,
+ .open = debug_periodic_open,
+ .read = debug_output,
+ .release = debug_close,
+};
+static const struct file_operations debug_registers_fops = {
+ .owner = THIS_MODULE,
+ .open = debug_registers_open,
+ .read = debug_output,
+ .release = debug_close,
+};
+
+static struct dentry *ehci_debug_root;
+
+struct debug_buffer {
+ ssize_t (*fill_func)(struct debug_buffer *); /* fill method */
+ struct usb_bus *bus;
+ struct mutex mutex; /* protect filling of buffer */
+ size_t count; /* number of characters filled into buffer */
+ char *page;
+};
#define speed_char(info1) ({ char tmp; \
switch (info1 & (3 << 12)) { \
*nextp = next;
}
-static ssize_t
-show_async(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t fill_async_buffer(struct debug_buffer *buf)
{
- struct usb_bus *bus;
struct usb_hcd *hcd;
struct ehci_hcd *ehci;
unsigned long flags;
char *next;
struct ehci_qh *qh;
- *buf = 0;
-
- bus = dev_get_drvdata(dev);
- hcd = bus_to_hcd(bus);
+ hcd = bus_to_hcd(buf->bus);
ehci = hcd_to_ehci (hcd);
- next = buf;
+ next = buf->page;
size = PAGE_SIZE;
+ *next = 0;
+
/* dumps a snapshot of the async schedule.
* usually empty except for long-term bulk reads, or head.
* one QH per line, and TDs we know about
}
spin_unlock_irqrestore (&ehci->lock, flags);
- return strlen (buf);
+ return strlen(buf->page);
}
-static DEVICE_ATTR(async, S_IRUGO, show_async, NULL);
#define DBG_SCHED_LIMIT 64
-
-static ssize_t
-show_periodic(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
{
- struct usb_bus *bus;
struct usb_hcd *hcd;
struct ehci_hcd *ehci;
unsigned long flags;
return 0;
seen_count = 0;
- bus = dev_get_drvdata(dev);
- hcd = bus_to_hcd(bus);
+ hcd = bus_to_hcd(buf->bus);
ehci = hcd_to_ehci (hcd);
- next = buf;
+ next = buf->page;
size = PAGE_SIZE;
temp = scnprintf (next, size, "size = %d\n", ehci->periodic_size);
return PAGE_SIZE - size;
}
-static DEVICE_ATTR(periodic, S_IRUGO, show_periodic, NULL);
-
#undef DBG_SCHED_LIMIT
-static ssize_t
-show_registers(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t fill_registers_buffer(struct debug_buffer *buf)
{
- struct usb_bus *bus;
struct usb_hcd *hcd;
struct ehci_hcd *ehci;
unsigned long flags;
static char fmt [] = "%*s\n";
static char label [] = "";
- bus = dev_get_drvdata(dev);
- hcd = bus_to_hcd(bus);
+ hcd = bus_to_hcd(buf->bus);
ehci = hcd_to_ehci (hcd);
- next = buf;
+ next = buf->page;
size = PAGE_SIZE;
spin_lock_irqsave (&ehci->lock, flags);
- if (bus->controller->power.power_state.event) {
+ if (buf->bus->controller->power.power_state.event) {
size = scnprintf (next, size,
"bus %s, device %s (driver " DRIVER_VERSION ")\n"
"%s\n"
return PAGE_SIZE - size;
}
-static DEVICE_ATTR(registers, S_IRUGO, show_registers, NULL);
-static inline void create_debug_files (struct ehci_hcd *ehci)
+static struct debug_buffer *alloc_buffer(struct usb_bus *bus,
+ ssize_t (*fill_func)(struct debug_buffer *))
{
- struct device *dev = ehci_to_hcd(ehci)->self.dev;
- int retval;
+ struct debug_buffer *buf;
+
+ buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
- retval = device_create_file(dev, &dev_attr_async);
- retval = device_create_file(dev, &dev_attr_periodic);
- retval = device_create_file(dev, &dev_attr_registers);
+ if (buf) {
+ buf->bus = bus;
+ buf->fill_func = fill_func;
+ mutex_init(&buf->mutex);
+ }
+
+ return buf;
}
-static inline void remove_debug_files (struct ehci_hcd *ehci)
+static int fill_buffer(struct debug_buffer *buf)
{
- struct device *dev = ehci_to_hcd(ehci)->self.dev;
+ int ret = 0;
+
+ if (!buf->page)
+ buf->page = (char *)get_zeroed_page(GFP_KERNEL);
+
+ if (!buf->page) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = buf->fill_func(buf);
- device_remove_file(dev, &dev_attr_async);
- device_remove_file(dev, &dev_attr_periodic);
- device_remove_file(dev, &dev_attr_registers);
+ if (ret >= 0) {
+ buf->count = ret;
+ ret = 0;
+ }
+
+out:
+ return ret;
}
-#endif /* STUB_DEBUG_FILES */
+static ssize_t debug_output(struct file *file, char __user *user_buf,
+ size_t len, loff_t *offset)
+{
+ struct debug_buffer *buf = file->private_data;
+ int ret = 0;
+
+ mutex_lock(&buf->mutex);
+ if (buf->count == 0) {
+ ret = fill_buffer(buf);
+ if (ret != 0) {
+ mutex_unlock(&buf->mutex);
+ goto out;
+ }
+ }
+ mutex_unlock(&buf->mutex);
+
+ ret = simple_read_from_buffer(user_buf, len, offset,
+ buf->page, buf->count);
+
+out:
+ return ret;
+
+}
+
+static int debug_close(struct inode *inode, struct file *file)
+{
+ struct debug_buffer *buf = file->private_data;
+ if (buf) {
+ if (buf->page)
+ free_page((unsigned long)buf->page);
+ kfree(buf);
+ }
+
+ return 0;
+}
+static int debug_async_open(struct inode *inode, struct file *file)
+{
+ file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
+
+ return file->private_data ? 0 : -ENOMEM;
+}
+
+static int debug_periodic_open(struct inode *inode, struct file *file)
+{
+ file->private_data = alloc_buffer(inode->i_private,
+ fill_periodic_buffer);
+
+ return file->private_data ? 0 : -ENOMEM;
+}
+
+static int debug_registers_open(struct inode *inode, struct file *file)
+{
+ file->private_data = alloc_buffer(inode->i_private,
+ fill_registers_buffer);
+
+ return file->private_data ? 0 : -ENOMEM;
+}
+
+static inline void create_debug_files (struct ehci_hcd *ehci)
+{
+ struct usb_bus *bus = &ehci_to_hcd(ehci)->self;
+
+ ehci->debug_dir = debugfs_create_dir(bus->bus_name, ehci_debug_root);
+ if (!ehci->debug_dir)
+ goto dir_error;
+
+ ehci->debug_async = debugfs_create_file("async", S_IRUGO,
+ ehci->debug_dir, bus,
+ &debug_async_fops);
+ if (!ehci->debug_async)
+ goto async_error;
+
+ ehci->debug_periodic = debugfs_create_file("periodic", S_IRUGO,
+ ehci->debug_dir, bus,
+ &debug_periodic_fops);
+ if (!ehci->debug_periodic)
+ goto periodic_error;
+
+ ehci->debug_registers = debugfs_create_file("registers", S_IRUGO,
+ ehci->debug_dir, bus,
+ &debug_registers_fops);
+ if (!ehci->debug_registers)
+ goto registers_error;
+ return;
+
+registers_error:
+ debugfs_remove(ehci->debug_periodic);
+periodic_error:
+ debugfs_remove(ehci->debug_async);
+async_error:
+ debugfs_remove(ehci->debug_dir);
+dir_error:
+ ehci->debug_periodic = NULL;
+ ehci->debug_async = NULL;
+ ehci->debug_dir = NULL;
+}
+
+static inline void remove_debug_files (struct ehci_hcd *ehci)
+{
+ debugfs_remove(ehci->debug_registers);
+ debugfs_remove(ehci->debug_periodic);
+ debugfs_remove(ehci->debug_async);
+ debugfs_remove(ehci->debug_dir);
+}
+
+#endif /* STUB_DEBUG_FILES */
projects / mirror_ubuntu-bionic-kernel.git / commitdiff