diff options
Diffstat (limited to 'kernel/drivers/usb/host/uhci-debug.c')
| -rw-r--r-- | kernel/drivers/usb/host/uhci-debug.c | 655 |
1 files changed, 655 insertions, 0 deletions
diff --git a/kernel/drivers/usb/host/uhci-debug.c b/kernel/drivers/usb/host/uhci-debug.c new file mode 100644 index 000000000..1b28a000d --- /dev/null +++ b/kernel/drivers/usb/host/uhci-debug.c @@ -0,0 +1,655 @@ +/* + * UHCI-specific debugging code. Invaluable when something + * goes wrong, but don't get in my face. + * + * Kernel visible pointers are surrounded in []s and bus + * visible pointers are surrounded in ()s + * + * (C) Copyright 1999 Linus Torvalds + * (C) Copyright 1999-2001 Johannes Erdfelt + */ + +#include <linux/slab.h> +#include <linux/kernel.h> +#include <linux/debugfs.h> +#include <asm/io.h> + +#include "uhci-hcd.h" + +#define EXTRA_SPACE 1024 + +static struct dentry *uhci_debugfs_root; + +#ifdef CONFIG_DYNAMIC_DEBUG + +/* Handle REALLY large printks so we don't overflow buffers */ +static void lprintk(char *buf) +{ + char *p; + + /* Just write one line at a time */ + while (buf) { + p = strchr(buf, '\n'); + if (p) + *p = 0; + printk(KERN_DEBUG "%s\n", buf); + buf = p; + if (buf) + buf++; + } +} + +static int uhci_show_td(struct uhci_hcd *uhci, struct uhci_td *td, char *buf, + int len, int space) +{ + char *out = buf; + char *spid; + u32 status, token; + + status = td_status(uhci, td); + out += sprintf(out, "%*s[%p] link (%08x) ", space, "", td, + hc32_to_cpu(uhci, td->link)); + out += sprintf(out, "e%d %s%s%s%s%s%s%s%s%s%sLength=%x ", + ((status >> 27) & 3), + (status & TD_CTRL_SPD) ? "SPD " : "", + (status & TD_CTRL_LS) ? "LS " : "", + (status & TD_CTRL_IOC) ? "IOC " : "", + (status & TD_CTRL_ACTIVE) ? "Active " : "", + (status & TD_CTRL_STALLED) ? "Stalled " : "", + (status & TD_CTRL_DBUFERR) ? "DataBufErr " : "", + (status & TD_CTRL_BABBLE) ? "Babble " : "", + (status & TD_CTRL_NAK) ? "NAK " : "", + (status & TD_CTRL_CRCTIMEO) ? "CRC/Timeo " : "", + (status & TD_CTRL_BITSTUFF) ? "BitStuff " : "", + status & 0x7ff); + if (out - buf > len) + goto done; + + token = td_token(uhci, td); + switch (uhci_packetid(token)) { + case USB_PID_SETUP: + spid = "SETUP"; + break; + case USB_PID_OUT: + spid = "OUT"; + break; + case USB_PID_IN: + spid = "IN"; + break; + default: + spid = "?"; + break; + } + + out += sprintf(out, "MaxLen=%x DT%d EndPt=%x Dev=%x, PID=%x(%s) ", + token >> 21, + ((token >> 19) & 1), + (token >> 15) & 15, + (token >> 8) & 127, + (token & 0xff), + spid); + out += sprintf(out, "(buf=%08x)\n", hc32_to_cpu(uhci, td->buffer)); + +done: + if (out - buf > len) + out += sprintf(out, " ...\n"); + return out - buf; +} + +static int uhci_show_urbp(struct uhci_hcd *uhci, struct urb_priv *urbp, + char *buf, int len, int space) +{ + char *out = buf; + struct uhci_td *td; + int i, nactive, ninactive; + char *ptype; + + + out += sprintf(out, "urb_priv [%p] ", urbp); + out += sprintf(out, "urb [%p] ", urbp->urb); + out += sprintf(out, "qh [%p] ", urbp->qh); + out += sprintf(out, "Dev=%d ", usb_pipedevice(urbp->urb->pipe)); + out += sprintf(out, "EP=%x(%s) ", usb_pipeendpoint(urbp->urb->pipe), + (usb_pipein(urbp->urb->pipe) ? "IN" : "OUT")); + if (out - buf > len) + goto done; + + switch (usb_pipetype(urbp->urb->pipe)) { + case PIPE_ISOCHRONOUS: ptype = "ISO"; break; + case PIPE_INTERRUPT: ptype = "INT"; break; + case PIPE_BULK: ptype = "BLK"; break; + default: + case PIPE_CONTROL: ptype = "CTL"; break; + } + + out += sprintf(out, "%s%s", ptype, (urbp->fsbr ? " FSBR" : "")); + out += sprintf(out, " Actlen=%d%s", urbp->urb->actual_length, + (urbp->qh->type == USB_ENDPOINT_XFER_CONTROL ? + "-8" : "")); + + if (urbp->urb->unlinked) + out += sprintf(out, " Unlinked=%d", urbp->urb->unlinked); + out += sprintf(out, "\n"); + + if (out - buf > len) + goto done; + + i = nactive = ninactive = 0; + list_for_each_entry(td, &urbp->td_list, list) { + if (urbp->qh->type != USB_ENDPOINT_XFER_ISOC && + (++i <= 10 || debug > 2)) { + out += sprintf(out, "%*s%d: ", space + 2, "", i); + out += uhci_show_td(uhci, td, out, + len - (out - buf), 0); + if (out - buf > len) + goto tail; + } else { + if (td_status(uhci, td) & TD_CTRL_ACTIVE) + ++nactive; + else + ++ninactive; + } + } + if (nactive + ninactive > 0) + out += sprintf(out, + "%*s[skipped %d inactive and %d active TDs]\n", + space, "", ninactive, nactive); +done: + if (out - buf > len) + out += sprintf(out, " ...\n"); +tail: + return out - buf; +} + +static int uhci_show_qh(struct uhci_hcd *uhci, + struct uhci_qh *qh, char *buf, int len, int space) +{ + char *out = buf; + int i, nurbs; + __hc32 element = qh_element(qh); + char *qtype; + + switch (qh->type) { + case USB_ENDPOINT_XFER_ISOC: qtype = "ISO"; break; + case USB_ENDPOINT_XFER_INT: qtype = "INT"; break; + case USB_ENDPOINT_XFER_BULK: qtype = "BLK"; break; + case USB_ENDPOINT_XFER_CONTROL: qtype = "CTL"; break; + default: qtype = "Skel" ; break; + } + + out += sprintf(out, "%*s[%p] %s QH link (%08x) element (%08x)\n", + space, "", qh, qtype, + hc32_to_cpu(uhci, qh->link), + hc32_to_cpu(uhci, element)); + if (qh->type == USB_ENDPOINT_XFER_ISOC) + out += sprintf(out, + "%*s period %d phase %d load %d us, frame %x desc [%p]\n", + space, "", qh->period, qh->phase, qh->load, + qh->iso_frame, qh->iso_packet_desc); + else if (qh->type == USB_ENDPOINT_XFER_INT) + out += sprintf(out, "%*s period %d phase %d load %d us\n", + space, "", qh->period, qh->phase, qh->load); + if (out - buf > len) + goto done; + + if (element & UHCI_PTR_QH(uhci)) + out += sprintf(out, "%*s Element points to QH (bug?)\n", space, ""); + + if (element & UHCI_PTR_DEPTH(uhci)) + out += sprintf(out, "%*s Depth traverse\n", space, ""); + + if (element & cpu_to_hc32(uhci, 8)) + out += sprintf(out, "%*s Bit 3 set (bug?)\n", space, ""); + + if (!(element & ~(UHCI_PTR_QH(uhci) | UHCI_PTR_DEPTH(uhci)))) + out += sprintf(out, "%*s Element is NULL (bug?)\n", space, ""); + + if (out - buf > len) + goto done; + + if (list_empty(&qh->queue)) { + out += sprintf(out, "%*s queue is empty\n", space, ""); + if (qh == uhci->skel_async_qh) { + out += uhci_show_td(uhci, uhci->term_td, out, + len - (out - buf), 0); + if (out - buf > len) + goto tail; + } + } else { + struct urb_priv *urbp = list_entry(qh->queue.next, + struct urb_priv, node); + struct uhci_td *td = list_entry(urbp->td_list.next, + struct uhci_td, list); + + if (element != LINK_TO_TD(uhci, td)) + out += sprintf(out, "%*s Element != First TD\n", + space, ""); + i = nurbs = 0; + list_for_each_entry(urbp, &qh->queue, node) { + if (++i <= 10) { + out += uhci_show_urbp(uhci, urbp, out, + len - (out - buf), space + 2); + if (out - buf > len) + goto tail; + } + else + ++nurbs; + } + if (nurbs > 0) + out += sprintf(out, "%*s Skipped %d URBs\n", + space, "", nurbs); + } + + if (out - buf > len) + goto done; + + if (qh->dummy_td) { + out += sprintf(out, "%*s Dummy TD\n", space, ""); + out += uhci_show_td(uhci, qh->dummy_td, out, + len - (out - buf), 0); + if (out - buf > len) + goto tail; + } + +done: + if (out - buf > len) + out += sprintf(out, " ...\n"); +tail: + return out - buf; +} + +static int uhci_show_sc(int port, unsigned short status, char *buf) +{ + return sprintf(buf, " stat%d = %04x %s%s%s%s%s%s%s%s%s%s\n", + port, + status, + (status & USBPORTSC_SUSP) ? " Suspend" : "", + (status & USBPORTSC_OCC) ? " OverCurrentChange" : "", + (status & USBPORTSC_OC) ? " OverCurrent" : "", + (status & USBPORTSC_PR) ? " Reset" : "", + (status & USBPORTSC_LSDA) ? " LowSpeed" : "", + (status & USBPORTSC_RD) ? " ResumeDetect" : "", + (status & USBPORTSC_PEC) ? " EnableChange" : "", + (status & USBPORTSC_PE) ? " Enabled" : "", + (status & USBPORTSC_CSC) ? " ConnectChange" : "", + (status & USBPORTSC_CCS) ? " Connected" : ""); +} + +static int uhci_show_root_hub_state(struct uhci_hcd *uhci, char *buf) +{ + char *rh_state; + + switch (uhci->rh_state) { + case UHCI_RH_RESET: + rh_state = "reset"; break; + case UHCI_RH_SUSPENDED: + rh_state = "suspended"; break; + case UHCI_RH_AUTO_STOPPED: + rh_state = "auto-stopped"; break; + case UHCI_RH_RESUMING: + rh_state = "resuming"; break; + case UHCI_RH_SUSPENDING: + rh_state = "suspending"; break; + case UHCI_RH_RUNNING: + rh_state = "running"; break; + case UHCI_RH_RUNNING_NODEVS: + rh_state = "running, no devs"; break; + default: + rh_state = "?"; break; + } + return sprintf(buf, "Root-hub state: %s FSBR: %d\n", + rh_state, uhci->fsbr_is_on); +} + +static int uhci_show_status(struct uhci_hcd *uhci, char *buf, int len) +{ + char *out = buf; + unsigned short usbcmd, usbstat, usbint, usbfrnum; + unsigned int flbaseadd; + unsigned char sof; + unsigned short portsc1, portsc2; + + + usbcmd = uhci_readw(uhci, USBCMD); + usbstat = uhci_readw(uhci, USBSTS); + usbint = uhci_readw(uhci, USBINTR); + usbfrnum = uhci_readw(uhci, USBFRNUM); + flbaseadd = uhci_readl(uhci, USBFLBASEADD); + sof = uhci_readb(uhci, USBSOF); + portsc1 = uhci_readw(uhci, USBPORTSC1); + portsc2 = uhci_readw(uhci, USBPORTSC2); + + out += sprintf(out, " usbcmd = %04x %s%s%s%s%s%s%s%s\n", + usbcmd, + (usbcmd & USBCMD_MAXP) ? "Maxp64 " : "Maxp32 ", + (usbcmd & USBCMD_CF) ? "CF " : "", + (usbcmd & USBCMD_SWDBG) ? "SWDBG " : "", + (usbcmd & USBCMD_FGR) ? "FGR " : "", + (usbcmd & USBCMD_EGSM) ? "EGSM " : "", + (usbcmd & USBCMD_GRESET) ? "GRESET " : "", + (usbcmd & USBCMD_HCRESET) ? "HCRESET " : "", + (usbcmd & USBCMD_RS) ? "RS " : ""); + if (out - buf > len) + goto done; + + out += sprintf(out, " usbstat = %04x %s%s%s%s%s%s\n", + usbstat, + (usbstat & USBSTS_HCH) ? "HCHalted " : "", + (usbstat & USBSTS_HCPE) ? "HostControllerProcessError " : "", + (usbstat & USBSTS_HSE) ? "HostSystemError " : "", + (usbstat & USBSTS_RD) ? "ResumeDetect " : "", + (usbstat & USBSTS_ERROR) ? "USBError " : "", + (usbstat & USBSTS_USBINT) ? "USBINT " : ""); + if (out - buf > len) + goto done; + + out += sprintf(out, " usbint = %04x\n", usbint); + out += sprintf(out, " usbfrnum = (%d)%03x\n", (usbfrnum >> 10) & 1, + 0xfff & (4*(unsigned int)usbfrnum)); + out += sprintf(out, " flbaseadd = %08x\n", flbaseadd); + out += sprintf(out, " sof = %02x\n", sof); + if (out - buf > len) + goto done; + + out += uhci_show_sc(1, portsc1, out); + if (out - buf > len) + goto done; + + out += uhci_show_sc(2, portsc2, out); + if (out - buf > len) + goto done; + + out += sprintf(out, + "Most recent frame: %x (%d) Last ISO frame: %x (%d)\n", + uhci->frame_number, uhci->frame_number & 1023, + uhci->last_iso_frame, uhci->last_iso_frame & 1023); + +done: + if (out - buf > len) + out += sprintf(out, " ...\n"); + return out - buf; +} + +static int uhci_sprint_schedule(struct uhci_hcd *uhci, char *buf, int len) +{ + char *out = buf; + int i, j; + struct uhci_qh *qh; + struct uhci_td *td; + struct list_head *tmp, *head; + int nframes, nerrs; + __hc32 link; + __hc32 fsbr_link; + + static const char * const qh_names[] = { + "unlink", "iso", "int128", "int64", "int32", "int16", + "int8", "int4", "int2", "async", "term" + }; + + out += uhci_show_root_hub_state(uhci, out); + if (out - buf > len) + goto done; + out += sprintf(out, "HC status\n"); + out += uhci_show_status(uhci, out, len - (out - buf)); + if (out - buf > len) + goto tail; + + out += sprintf(out, "Periodic load table\n"); + for (i = 0; i < MAX_PHASE; ++i) { + out += sprintf(out, "\t%d", uhci->load[i]); + if (i % 8 == 7) + *out++ = '\n'; + } + out += sprintf(out, "Total: %d, #INT: %d, #ISO: %d\n", + uhci->total_load, + uhci_to_hcd(uhci)->self.bandwidth_int_reqs, + uhci_to_hcd(uhci)->self.bandwidth_isoc_reqs); + if (debug <= 1) + goto tail; + + out += sprintf(out, "Frame List\n"); + nframes = 10; + nerrs = 0; + for (i = 0; i < UHCI_NUMFRAMES; ++i) { + __hc32 qh_dma; + + if (out - buf > len) + goto done; + j = 0; + td = uhci->frame_cpu[i]; + link = uhci->frame[i]; + if (!td) + goto check_link; + + if (nframes > 0) { + out += sprintf(out, "- Frame %d -> (%08x)\n", + i, hc32_to_cpu(uhci, link)); + j = 1; + } + + head = &td->fl_list; + tmp = head; + do { + td = list_entry(tmp, struct uhci_td, fl_list); + tmp = tmp->next; + if (link != LINK_TO_TD(uhci, td)) { + if (nframes > 0) { + out += sprintf(out, + " link does not match list entry!\n"); + if (out - buf > len) + goto done; + } else + ++nerrs; + } + if (nframes > 0) { + out += uhci_show_td(uhci, td, out, + len - (out - buf), 4); + if (out - buf > len) + goto tail; + } + link = td->link; + } while (tmp != head); + +check_link: + qh_dma = uhci_frame_skel_link(uhci, i); + if (link != qh_dma) { + if (nframes > 0) { + if (!j) { + out += sprintf(out, + "- Frame %d -> (%08x)\n", + i, hc32_to_cpu(uhci, link)); + j = 1; + } + out += sprintf(out, + " link does not match QH (%08x)!\n", + hc32_to_cpu(uhci, qh_dma)); + if (out - buf > len) + goto done; + } else + ++nerrs; + } + nframes -= j; + } + if (nerrs > 0) + out += sprintf(out, "Skipped %d bad links\n", nerrs); + + out += sprintf(out, "Skeleton QHs\n"); + + if (out - buf > len) + goto done; + + fsbr_link = 0; + for (i = 0; i < UHCI_NUM_SKELQH; ++i) { + int cnt = 0; + + qh = uhci->skelqh[i]; + out += sprintf(out, "- skel_%s_qh\n", qh_names[i]); + out += uhci_show_qh(uhci, qh, out, len - (out - buf), 4); + if (out - buf > len) + goto tail; + + /* Last QH is the Terminating QH, it's different */ + if (i == SKEL_TERM) { + if (qh_element(qh) != LINK_TO_TD(uhci, uhci->term_td)) { + out += sprintf(out, + " skel_term_qh element is not set to term_td!\n"); + if (out - buf > len) + goto done; + } + link = fsbr_link; + if (!link) + link = LINK_TO_QH(uhci, uhci->skel_term_qh); + goto check_qh_link; + } + + head = &qh->node; + tmp = head->next; + + while (tmp != head) { + qh = list_entry(tmp, struct uhci_qh, node); + tmp = tmp->next; + if (++cnt <= 10) { + out += uhci_show_qh(uhci, qh, out, + len - (out - buf), 4); + if (out - buf > len) + goto tail; + } + if (!fsbr_link && qh->skel >= SKEL_FSBR) + fsbr_link = LINK_TO_QH(uhci, qh); + } + if ((cnt -= 10) > 0) + out += sprintf(out, " Skipped %d QHs\n", cnt); + + link = UHCI_PTR_TERM(uhci); + if (i <= SKEL_ISO) + ; + else if (i < SKEL_ASYNC) + link = LINK_TO_QH(uhci, uhci->skel_async_qh); + else if (!uhci->fsbr_is_on) + ; + else + link = LINK_TO_QH(uhci, uhci->skel_term_qh); +check_qh_link: + if (qh->link != link) + out += sprintf(out, + " last QH not linked to next skeleton!\n"); + + if (out - buf > len) + goto done; + } + +done: + if (out - buf > len) + out += sprintf(out, " ...\n"); +tail: + return out - buf; +} + +#ifdef CONFIG_DEBUG_FS + +#define MAX_OUTPUT (64 * 1024) + +struct uhci_debug { + int size; + char *data; +}; + +static int uhci_debug_open(struct inode *inode, struct file *file) +{ + struct uhci_hcd *uhci = inode->i_private; + struct uhci_debug *up; + unsigned long flags; + + up = kmalloc(sizeof(*up), GFP_KERNEL); + if (!up) + return -ENOMEM; + + up->data = kmalloc(MAX_OUTPUT, GFP_KERNEL); + if (!up->data) { + kfree(up); + return -ENOMEM; + } + + up->size = 0; + spin_lock_irqsave(&uhci->lock, flags); + if (uhci->is_initialized) + up->size = uhci_sprint_schedule(uhci, up->data, + MAX_OUTPUT - EXTRA_SPACE); + spin_unlock_irqrestore(&uhci->lock, flags); + + file->private_data = up; + + return 0; +} + +static loff_t uhci_debug_lseek(struct file *file, loff_t off, int whence) +{ + struct uhci_debug *up; + loff_t new = -1; + + up = file->private_data; + + /* + * XXX: atomic 64bit seek access, but that needs to be fixed in the VFS + */ + switch (whence) { + case 0: + new = off; + break; + case 1: + new = file->f_pos + off; + break; + } + + if (new < 0 || new > up->size) + return -EINVAL; + + return (file->f_pos = new); +} + +static ssize_t uhci_debug_read(struct file *file, char __user *buf, + size_t nbytes, loff_t *ppos) +{ + struct uhci_debug *up = file->private_data; + return simple_read_from_buffer(buf, nbytes, ppos, up->data, up->size); +} + +static int uhci_debug_release(struct inode *inode, struct file *file) +{ + struct uhci_debug *up = file->private_data; + + kfree(up->data); + kfree(up); + + return 0; +} + +static const 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, +}; +#define UHCI_DEBUG_OPS + +#endif /* CONFIG_DEBUG_FS */ + +#else /* CONFIG_DYNAMIC_DEBUG*/ + +static inline void lprintk(char *buf) +{} + +static inline int uhci_show_qh(struct uhci_hcd *uhci, + 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 |