diff options
| -rw-r--r-- | drivers/usb/host/ehci-dbg.c | 227 | ||||
| -rw-r--r-- | drivers/usb/host/ehci-hcd.c | 25 | ||||
| -rw-r--r-- | drivers/usb/host/ehci.h | 8 |
3 files changed, 219 insertions, 41 deletions
diff --git a/drivers/usb/host/ehci-dbg.c b/drivers/usb/host/ehci-dbg.c index 754a146..39673f8 100644 --- a/drivers/usb/host/ehci-dbg.c +++ b/drivers/usb/host/ehci-dbg.c @@ -323,7 +323,43 @@ static inline void remove_debug_files (struct ehci_hcd *bus) { } #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)) { \ @@ -441,10 +477,8 @@ done: *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; @@ -452,14 +486,13 @@ show_async(struct device *dev, struct device_attribute *attr, char *buf) 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 @@ -477,16 +510,12 @@ show_async(struct device *dev, struct device_attribute *attr, char *buf) } 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; @@ -500,10 +529,9 @@ show_periodic(struct device *dev, struct device_attribute *attr, char *buf) 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); @@ -623,14 +651,10 @@ show_periodic(struct device *dev, struct device_attribute *attr, char *buf) 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; @@ -639,15 +663,14 @@ show_registers(struct device *dev, struct device_attribute *attr, char *buf) 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" @@ -789,26 +812,150 @@ done: 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 */ diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index 5f2d74e..2641826 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -33,6 +33,7 @@ #include <linux/usb.h> #include <linux/moduleparam.h> #include <linux/dma-mapping.h> +#include <linux/debugfs.h> #include "../core/hcd.h" @@ -978,15 +979,30 @@ static int __init ehci_hcd_init(void) sizeof(struct ehci_qh), sizeof(struct ehci_qtd), sizeof(struct ehci_itd), sizeof(struct ehci_sitd)); +#ifdef DEBUG + ehci_debug_root = debugfs_create_dir("ehci", NULL); + if (!ehci_debug_root) + return -ENOENT; +#endif + #ifdef PLATFORM_DRIVER retval = platform_driver_register(&PLATFORM_DRIVER); - if (retval < 0) + if (retval < 0) { +#ifdef DEBUG + debugfs_remove(ehci_debug_root); + ehci_debug_root = NULL; +#endif return retval; + } #endif #ifdef PCI_DRIVER retval = pci_register_driver(&PCI_DRIVER); if (retval < 0) { +#ifdef DEBUG + debugfs_remove(ehci_debug_root); + ehci_debug_root = NULL; +#endif #ifdef PLATFORM_DRIVER platform_driver_unregister(&PLATFORM_DRIVER); #endif @@ -997,6 +1013,10 @@ static int __init ehci_hcd_init(void) #ifdef PS3_SYSTEM_BUS_DRIVER retval = ps3_ehci_driver_register(&PS3_SYSTEM_BUS_DRIVER); if (retval < 0) { +#ifdef DEBUG + debugfs_remove(ehci_debug_root); + ehci_debug_root = NULL; +#endif #ifdef PLATFORM_DRIVER platform_driver_unregister(&PLATFORM_DRIVER); #endif @@ -1022,6 +1042,9 @@ static void __exit ehci_hcd_cleanup(void) #ifdef PS3_SYSTEM_BUS_DRIVER ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER); #endif +#ifdef DEBUG + debugfs_remove(ehci_debug_root); +#endif } module_exit(ehci_hcd_cleanup); diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h index 951d69f..10e7141 100644 --- a/drivers/usb/host/ehci.h +++ b/drivers/usb/host/ehci.h @@ -127,6 +127,14 @@ struct ehci_hcd { /* one per controller */ #else # define COUNT(x) do {} while (0) #endif + + /* debug files */ +#ifdef DEBUG + struct dentry *debug_dir; + struct dentry *debug_async; + struct dentry *debug_periodic; + struct dentry *debug_registers; +#endif }; /* convert between an HCD pointer and the corresponding EHCI_HCD */ |
