X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fusb%2Fhost%2Fehci-dbg.c;h=64ebfc5548a31c04735bcb428aa040a68e4a2598;hb=038eb0ea04b245351be34b0ae76b55eee4603989;hp=43eddaecc3dd520da48e9dcb7367157d8f7ff565;hpb=4935361766cc73949fe032cd157d314f288922ba;p=linux-2.6-omap-h63xx.git diff --git a/drivers/usb/host/ehci-dbg.c b/drivers/usb/host/ehci-dbg.c index 43eddaecc3d..64ebfc5548a 100644 --- a/drivers/usb/host/ehci-dbg.c +++ b/drivers/usb/host/ehci-dbg.c @@ -52,7 +52,7 @@ static void dbg_hcs_params (struct ehci_hcd *ehci, char *label) HCS_INDICATOR (params) ? " ind" : "", HCS_N_CC (params), HCS_N_PCC (params), - HCS_PORTROUTED (params) ? "" : " ordered", + HCS_PORTROUTED (params) ? "" : " ordered", HCS_PPC (params) ? "" : " !ppc", HCS_N_PORTS (params) ); @@ -91,20 +91,20 @@ static void dbg_hcc_params (struct ehci_hcd *ehci, char *label) if (HCC_ISOC_CACHE (params)) { ehci_dbg (ehci, - "%s hcc_params %04x caching frame %s%s%s\n", - label, params, - HCC_PGM_FRAMELISTLEN (params) ? "256/512/1024" : "1024", - HCC_CANPARK (params) ? " park" : "", - HCC_64BIT_ADDR (params) ? " 64 bit addr" : ""); + "%s hcc_params %04x caching frame %s%s%s\n", + label, params, + HCC_PGM_FRAMELISTLEN(params) ? "256/512/1024" : "1024", + HCC_CANPARK(params) ? " park" : "", + HCC_64BIT_ADDR(params) ? " 64 bit addr" : ""); } else { ehci_dbg (ehci, - "%s hcc_params %04x thresh %d uframes %s%s%s\n", - label, - params, - HCC_ISOC_THRES (params), - HCC_PGM_FRAMELISTLEN (params) ? "256/512/1024" : "1024", - HCC_CANPARK (params) ? " park" : "", - HCC_64BIT_ADDR (params) ? " 64 bit addr" : ""); + "%s hcc_params %04x thresh %d uframes %s%s%s\n", + label, + params, + HCC_ISOC_THRES(params), + HCC_PGM_FRAMELISTLEN(params) ? "256/512/1024" : "1024", + HCC_CANPARK(params) ? " park" : "", + HCC_64BIT_ADDR(params) ? " 64 bit addr" : ""); } } #else @@ -115,23 +115,23 @@ static inline void dbg_hcc_params (struct ehci_hcd *ehci, char *label) {} #ifdef DEBUG -static void __attribute__((__unused__)) +static void __maybe_unused dbg_qtd (const char *label, struct ehci_hcd *ehci, struct ehci_qtd *qtd) { - ehci_dbg (ehci, "%s td %p n%08x %08x t%08x p0=%08x\n", label, qtd, - le32_to_cpup (&qtd->hw_next), - le32_to_cpup (&qtd->hw_alt_next), - le32_to_cpup (&qtd->hw_token), - le32_to_cpup (&qtd->hw_buf [0])); + ehci_dbg(ehci, "%s td %p n%08x %08x t%08x p0=%08x\n", label, qtd, + hc32_to_cpup(ehci, &qtd->hw_next), + hc32_to_cpup(ehci, &qtd->hw_alt_next), + hc32_to_cpup(ehci, &qtd->hw_token), + hc32_to_cpup(ehci, &qtd->hw_buf [0])); if (qtd->hw_buf [1]) - ehci_dbg (ehci, " p1=%08x p2=%08x p3=%08x p4=%08x\n", - le32_to_cpup (&qtd->hw_buf [1]), - le32_to_cpup (&qtd->hw_buf [2]), - le32_to_cpup (&qtd->hw_buf [3]), - le32_to_cpup (&qtd->hw_buf [4])); + ehci_dbg(ehci, " p1=%08x p2=%08x p3=%08x p4=%08x\n", + hc32_to_cpup(ehci, &qtd->hw_buf[1]), + hc32_to_cpup(ehci, &qtd->hw_buf[2]), + hc32_to_cpup(ehci, &qtd->hw_buf[3]), + hc32_to_cpup(ehci, &qtd->hw_buf[4])); } -static void __attribute__((__unused__)) +static void __maybe_unused dbg_qh (const char *label, struct ehci_hcd *ehci, struct ehci_qh *qh) { ehci_dbg (ehci, "%s qh %p n%08x info %x %x qtd %x\n", label, @@ -140,51 +140,53 @@ dbg_qh (const char *label, struct ehci_hcd *ehci, struct ehci_qh *qh) dbg_qtd ("overlay", ehci, (struct ehci_qtd *) &qh->hw_qtd_next); } -static void __attribute__((__unused__)) +static void __maybe_unused dbg_itd (const char *label, struct ehci_hcd *ehci, struct ehci_itd *itd) { ehci_dbg (ehci, "%s [%d] itd %p, next %08x, urb %p\n", - label, itd->frame, itd, le32_to_cpu(itd->hw_next), itd->urb); + label, itd->frame, itd, hc32_to_cpu(ehci, itd->hw_next), + itd->urb); ehci_dbg (ehci, " trans: %08x %08x %08x %08x %08x %08x %08x %08x\n", - le32_to_cpu(itd->hw_transaction[0]), - le32_to_cpu(itd->hw_transaction[1]), - le32_to_cpu(itd->hw_transaction[2]), - le32_to_cpu(itd->hw_transaction[3]), - le32_to_cpu(itd->hw_transaction[4]), - le32_to_cpu(itd->hw_transaction[5]), - le32_to_cpu(itd->hw_transaction[6]), - le32_to_cpu(itd->hw_transaction[7])); + hc32_to_cpu(ehci, itd->hw_transaction[0]), + hc32_to_cpu(ehci, itd->hw_transaction[1]), + hc32_to_cpu(ehci, itd->hw_transaction[2]), + hc32_to_cpu(ehci, itd->hw_transaction[3]), + hc32_to_cpu(ehci, itd->hw_transaction[4]), + hc32_to_cpu(ehci, itd->hw_transaction[5]), + hc32_to_cpu(ehci, itd->hw_transaction[6]), + hc32_to_cpu(ehci, itd->hw_transaction[7])); ehci_dbg (ehci, " buf: %08x %08x %08x %08x %08x %08x %08x\n", - le32_to_cpu(itd->hw_bufp[0]), - le32_to_cpu(itd->hw_bufp[1]), - le32_to_cpu(itd->hw_bufp[2]), - le32_to_cpu(itd->hw_bufp[3]), - le32_to_cpu(itd->hw_bufp[4]), - le32_to_cpu(itd->hw_bufp[5]), - le32_to_cpu(itd->hw_bufp[6])); + hc32_to_cpu(ehci, itd->hw_bufp[0]), + hc32_to_cpu(ehci, itd->hw_bufp[1]), + hc32_to_cpu(ehci, itd->hw_bufp[2]), + hc32_to_cpu(ehci, itd->hw_bufp[3]), + hc32_to_cpu(ehci, itd->hw_bufp[4]), + hc32_to_cpu(ehci, itd->hw_bufp[5]), + hc32_to_cpu(ehci, itd->hw_bufp[6])); ehci_dbg (ehci, " index: %d %d %d %d %d %d %d %d\n", itd->index[0], itd->index[1], itd->index[2], itd->index[3], itd->index[4], itd->index[5], itd->index[6], itd->index[7]); } -static void __attribute__((__unused__)) +static void __maybe_unused dbg_sitd (const char *label, struct ehci_hcd *ehci, struct ehci_sitd *sitd) { ehci_dbg (ehci, "%s [%d] sitd %p, next %08x, urb %p\n", - label, sitd->frame, sitd, le32_to_cpu(sitd->hw_next), sitd->urb); + label, sitd->frame, sitd, hc32_to_cpu(ehci, sitd->hw_next), + sitd->urb); ehci_dbg (ehci, " addr %08x sched %04x result %08x buf %08x %08x\n", - le32_to_cpu(sitd->hw_fullspeed_ep), - le32_to_cpu(sitd->hw_uframe), - le32_to_cpu(sitd->hw_results), - le32_to_cpu(sitd->hw_buf [0]), - le32_to_cpu(sitd->hw_buf [1])); + hc32_to_cpu(ehci, sitd->hw_fullspeed_ep), + hc32_to_cpu(ehci, sitd->hw_uframe), + hc32_to_cpu(ehci, sitd->hw_results), + hc32_to_cpu(ehci, sitd->hw_buf[0]), + hc32_to_cpu(ehci, sitd->hw_buf[1])); } -static int __attribute__((__unused__)) +static int __maybe_unused dbg_status_buf (char *buf, unsigned len, const char *label, u32 status) { return scnprintf (buf, len, @@ -203,7 +205,7 @@ dbg_status_buf (char *buf, unsigned len, const char *label, u32 status) ); } -static int __attribute__((__unused__)) +static int __maybe_unused dbg_intr_buf (char *buf, unsigned len, const char *label, u32 enable) { return scnprintf (buf, len, @@ -267,28 +269,27 @@ dbg_port_buf (char *buf, unsigned len, const char *label, int port, u32 status) (status & PORT_PEC) ? " PEC" : "", (status & PORT_PE) ? " PE" : "", (status & PORT_CSC) ? " CSC" : "", - (status & PORT_CONNECT) ? " CONNECT" : "" - ); + (status & PORT_CONNECT) ? " CONNECT" : ""); } #else -static inline void __attribute__((__unused__)) +static inline void __maybe_unused dbg_qh (char *label, struct ehci_hcd *ehci, struct ehci_qh *qh) {} -static inline int __attribute__((__unused__)) +static inline int __maybe_unused dbg_status_buf (char *buf, unsigned len, const char *label, u32 status) { return 0; } -static inline int __attribute__((__unused__)) +static inline int __maybe_unused dbg_command_buf (char *buf, unsigned len, const char *label, u32 command) { return 0; } -static inline int __attribute__((__unused__)) +static inline int __maybe_unused dbg_intr_buf (char *buf, unsigned len, const char *label, u32 enable) { return 0; } -static inline int __attribute__((__unused__)) +static inline int __maybe_unused dbg_port_buf (char *buf, unsigned len, const char *label, int port, u32 status) { return 0; } @@ -322,7 +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)) { \ @@ -332,9 +369,10 @@ static inline void remove_debug_files (struct ehci_hcd *bus) { } default: tmp = '?'; break; \ }; tmp; }) -static inline char token_mark (__le32 token) +static inline char token_mark(struct ehci_hcd *ehci, __hc32 token) { - __u32 v = le32_to_cpu (token); + __u32 v = hc32_to_cpu(ehci, token); + if (v & QTD_STS_ACTIVE) return '*'; if (v & QTD_STS_HALT) @@ -360,46 +398,48 @@ static void qh_lines ( unsigned size = *sizep; char *next = *nextp; char mark; + u32 list_end = EHCI_LIST_END(ehci); - if (qh->hw_qtd_next == EHCI_LIST_END) /* NEC does this */ + if (qh->hw_qtd_next == list_end) /* NEC does this */ mark = '@'; else - mark = token_mark (qh->hw_token); + mark = token_mark(ehci, qh->hw_token); if (mark == '/') { /* qh_alt_next controls qh advance? */ - if ((qh->hw_alt_next & QTD_MASK) == ehci->async->hw_alt_next) + if ((qh->hw_alt_next & QTD_MASK(ehci)) + == ehci->async->hw_alt_next) mark = '#'; /* blocked */ - else if (qh->hw_alt_next == EHCI_LIST_END) + else if (qh->hw_alt_next == list_end) mark = '.'; /* use hw_qtd_next */ /* else alt_next points to some other qtd */ } - scratch = le32_to_cpup (&qh->hw_info1); - hw_curr = (mark == '*') ? le32_to_cpup (&qh->hw_current) : 0; + scratch = hc32_to_cpup(ehci, &qh->hw_info1); + hw_curr = (mark == '*') ? hc32_to_cpup(ehci, &qh->hw_current) : 0; temp = scnprintf (next, size, "qh/%p dev%d %cs ep%d %08x %08x (%08x%c %s nak%d)", qh, scratch & 0x007f, speed_char (scratch), (scratch >> 8) & 0x000f, - scratch, le32_to_cpup (&qh->hw_info2), - le32_to_cpup (&qh->hw_token), mark, - (__constant_cpu_to_le32 (QTD_TOGGLE) & qh->hw_token) + scratch, hc32_to_cpup(ehci, &qh->hw_info2), + hc32_to_cpup(ehci, &qh->hw_token), mark, + (cpu_to_hc32(ehci, QTD_TOGGLE) & qh->hw_token) ? "data1" : "data0", - (le32_to_cpup (&qh->hw_alt_next) >> 1) & 0x0f); + (hc32_to_cpup(ehci, &qh->hw_alt_next) >> 1) & 0x0f); size -= temp; next += temp; /* hc may be modifying the list as we read it ... */ list_for_each (entry, &qh->qtd_list) { td = list_entry (entry, struct ehci_qtd, qtd_list); - scratch = le32_to_cpup (&td->hw_token); + scratch = hc32_to_cpup(ehci, &td->hw_token); mark = ' '; if (hw_curr == td->qtd_dma) mark = '*'; - else if (qh->hw_qtd_next == cpu_to_le32(td->qtd_dma)) + else if (qh->hw_qtd_next == cpu_to_hc32(ehci, td->qtd_dma)) mark = '+'; else if (QTD_LENGTH (scratch)) { if (td->hw_alt_next == ehci->async->hw_alt_next) mark = '#'; - else if (td->hw_alt_next != EHCI_LIST_END) + else if (td->hw_alt_next != list_end) mark = '/'; } temp = snprintf (next, size, @@ -437,10 +477,8 @@ done: *nextp = next; } -static ssize_t -show_async (struct class_device *class_dev, 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; @@ -448,14 +486,13 @@ show_async (struct class_device *class_dev, char *buf) char *next; struct ehci_qh *qh; - *buf = 0; - - bus = class_get_devdata(class_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 @@ -473,16 +510,12 @@ show_async (struct class_device *class_dev, char *buf) } spin_unlock_irqrestore (&ehci->lock, flags); - return strlen (buf); + return strlen(buf->page); } -static CLASS_DEVICE_ATTR (async, S_IRUGO, show_async, NULL); #define DBG_SCHED_LIMIT 64 - -static ssize_t -show_periodic (struct class_device *class_dev, 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; @@ -490,16 +523,15 @@ show_periodic (struct class_device *class_dev, char *buf) unsigned temp, size, seen_count; char *next; unsigned i; - __le32 tag; + __hc32 tag; if (!(seen = kmalloc (DBG_SCHED_LIMIT * sizeof *seen, GFP_ATOMIC))) return 0; seen_count = 0; - bus = class_get_devdata(class_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); @@ -514,18 +546,19 @@ show_periodic (struct class_device *class_dev, char *buf) p = ehci->pshadow [i]; if (likely (!p.ptr)) continue; - tag = Q_NEXT_TYPE (ehci->periodic [i]); + tag = Q_NEXT_TYPE(ehci, ehci->periodic [i]); temp = scnprintf (next, size, "%4d: ", i); size -= temp; next += temp; do { - switch (tag) { + switch (hc32_to_cpu(ehci, tag)) { case Q_TYPE_QH: temp = scnprintf (next, size, " qh%d-%04x/%p", p.qh->period, - le32_to_cpup (&p.qh->hw_info2) + hc32_to_cpup(ehci, + &p.qh->hw_info2) /* uframe masks */ & (QH_CMASK | QH_SMASK), p.qh); @@ -543,7 +576,7 @@ show_periodic (struct class_device *class_dev, char *buf) } /* show more info the first time around */ if (temp == seen_count && p.ptr) { - u32 scratch = le32_to_cpup ( + u32 scratch = hc32_to_cpup(ehci, &p.qh->hw_info1); struct ehci_qtd *qtd; char *type = ""; @@ -554,7 +587,8 @@ show_periodic (struct class_device *class_dev, char *buf) &p.qh->qtd_list, qtd_list) { temp++; - switch (0x03 & (le32_to_cpu ( + switch (0x03 & (hc32_to_cpu( + ehci, qtd->hw_token) >> 8)) { case 0: type = "out"; continue; case 1: type = "in"; continue; @@ -576,7 +610,7 @@ show_periodic (struct class_device *class_dev, char *buf) } else temp = 0; if (p.qh) { - tag = Q_NEXT_TYPE (p.qh->hw_next); + tag = Q_NEXT_TYPE(ehci, p.qh->hw_next); p = p.qh->qh_next; } break; @@ -584,23 +618,23 @@ show_periodic (struct class_device *class_dev, char *buf) temp = scnprintf (next, size, " fstn-%8x/%p", p.fstn->hw_prev, p.fstn); - tag = Q_NEXT_TYPE (p.fstn->hw_next); + tag = Q_NEXT_TYPE(ehci, p.fstn->hw_next); p = p.fstn->fstn_next; break; case Q_TYPE_ITD: temp = scnprintf (next, size, " itd/%p", p.itd); - tag = Q_NEXT_TYPE (p.itd->hw_next); + tag = Q_NEXT_TYPE(ehci, p.itd->hw_next); p = p.itd->itd_next; break; case Q_TYPE_SITD: temp = scnprintf (next, size, " sitd%d-%04x/%p", p.sitd->stream->interval, - le32_to_cpup (&p.sitd->hw_uframe) + hc32_to_cpup(ehci, &p.sitd->hw_uframe) & 0x0000ffff, p.sitd); - tag = Q_NEXT_TYPE (p.sitd->hw_next); + tag = Q_NEXT_TYPE(ehci, p.sitd->hw_next); p = p.sitd->sitd_next; break; } @@ -617,14 +651,10 @@ show_periodic (struct class_device *class_dev, char *buf) return PAGE_SIZE - size; } -static CLASS_DEVICE_ATTR (periodic, S_IRUGO, show_periodic, NULL); - #undef DBG_SCHED_LIMIT -static ssize_t -show_registers (struct class_device *class_dev, 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; @@ -633,15 +663,14 @@ show_registers (struct class_device *class_dev, char *buf) static char fmt [] = "%*s\n"; static char label [] = ""; - bus = class_get_devdata(class_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" @@ -673,7 +702,8 @@ show_registers (struct class_device *class_dev, char *buf) unsigned count = 256/4; pdev = to_pci_dev(ehci_to_hcd(ehci)->self.controller); - offset = HCC_EXT_CAPS (ehci_readl(ehci, &ehci->caps->hcc_params)); + offset = HCC_EXT_CAPS(ehci_readl(ehci, + &ehci->caps->hcc_params)); while (offset && count--) { pci_read_config_dword (pdev, offset, &cap); switch (cap & 0xff) { @@ -740,23 +770,23 @@ show_registers (struct class_device *class_dev, char *buf) for (i = 1; i <= HCS_N_PORTS (ehci->hcs_params); i++) { temp = dbg_port_buf (scratch, sizeof scratch, label, i, - ehci_readl(ehci, &ehci->regs->port_status [i - 1])); + ehci_readl(ehci, + &ehci->regs->port_status[i - 1])); temp = scnprintf (next, size, fmt, temp, scratch); size -= temp; next += temp; if (i == HCS_DEBUG_PORT(ehci->hcs_params) && ehci->debug) { temp = scnprintf (next, size, " debug control %08x\n", - ehci_readl(ehci, &ehci->debug->control)); + ehci_readl(ehci, + &ehci->debug->control)); size -= temp; next += temp; } } if (ehci->reclaim) { - temp = scnprintf (next, size, "reclaim qh %p%s\n", - ehci->reclaim, - ehci->reclaim_ready ? " ready" : ""); + temp = scnprintf(next, size, "reclaim qh %p\n", ehci->reclaim); size -= temp; next += temp; } @@ -780,26 +810,150 @@ done: return PAGE_SIZE - size; } -static CLASS_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 class_device *cldev = ehci_to_hcd(ehci)->self.class_dev; - int retval; + struct debug_buffer *buf; + + buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL); - retval = class_device_create_file(cldev, &class_device_attr_async); - retval = class_device_create_file(cldev, &class_device_attr_periodic); - retval = class_device_create_file(cldev, &class_device_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 class_device *cldev = ehci_to_hcd(ehci)->self.class_dev; + int ret = 0; + + if (!buf->page) + buf->page = (char *)get_zeroed_page(GFP_KERNEL); + + if (!buf->page) { + ret = -ENOMEM; + goto out; + } - class_device_remove_file(cldev, &class_device_attr_async); - class_device_remove_file(cldev, &class_device_attr_periodic); - class_device_remove_file(cldev, &class_device_attr_registers); + ret = buf->fill_func(buf); + + 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 */