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xhci: Show host status when watchdog triggers and host is assumed dead.

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Additional debugging to show xHC USBSTS register when stop endpoint
command watchdog triggers and host is assumed dead.

useful to know the current status before the controller is stopped by
the xhci driver and everything is released and freed.

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20200312144517.1593-4-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathias Nyman 2020-03-12 16:45:11 +02:00 committed by Greg Kroah-Hartman
parent 76eac5d21a
commit 9c1aa36efd
2 changed files with 33 additions and 0 deletions
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4
drivers/usb/host/xhci-ring.c
View File

@ -955,6 +955,7 @@ void xhci_stop_endpoint_command_watchdog(struct timer_list *t)
struct xhci_virt_ep *ep = from_timer(ep, t, stop_cmd_timer);
struct xhci_hcd *xhci = ep->xhci;
unsigned long flags;
u32 usbsts;
spin_lock_irqsave(&xhci->lock, flags);
@ -965,8 +966,11 @@ void xhci_stop_endpoint_command_watchdog(struct timer_list *t)
xhci_dbg(xhci, "Stop EP timer raced with cmd completion, exit");
return;
}
usbsts = readl(&xhci->op_regs->status);
xhci_warn(xhci, "xHCI host not responding to stop endpoint command.\n");
xhci_warn(xhci, "USBSTS:%s\n", xhci_decode_usbsts(usbsts));
ep->ep_state &= ~EP_STOP_CMD_PENDING;
xhci_halt(xhci);

29
drivers/usb/host/xhci.h
View File

@ -2589,6 +2589,35 @@ static inline const char *xhci_decode_portsc(u32 portsc)
return str;
}
static inline const char *xhci_decode_usbsts(u32 usbsts)
{
static char str[256];
int ret = 0;
if (usbsts == ~(u32)0)
return " 0xffffffff";
if (usbsts & STS_HALT)
ret += sprintf(str + ret, " HCHalted");
if (usbsts & STS_FATAL)
ret += sprintf(str + ret, " HSE");
if (usbsts & STS_EINT)
ret += sprintf(str + ret, " EINT");
if (usbsts & STS_PORT)
ret += sprintf(str + ret, " PCD");
if (usbsts & STS_SAVE)
ret += sprintf(str + ret, " SSS");
if (usbsts & STS_RESTORE)
ret += sprintf(str + ret, " RSS");
if (usbsts & STS_SRE)
ret += sprintf(str + ret, " SRE");
if (usbsts & STS_CNR)
ret += sprintf(str + ret, " CNR");
if (usbsts & STS_HCE)
ret += sprintf(str + ret, " HCE");
return str;
}
static inline const char *xhci_decode_doorbell(u32 slot, u32 doorbell)
{
static char str[256];