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USB: EHCI: enhance "async" debugfs output 

This patch enhances the "async" debugfs file in ehci-hcd by printing
out several additional fields in the hardware-accessible data
structures.  These fields are important for determining the hardware's
view of the async schedule, in particular, the addresses of the
current and next qTDs for each QH along with the start address of each
qTD's data buffer.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Stern 2015-11-20 13:53:45 -05:00 committed by Greg Kroah-Hartman
parent a016a816bb
commit 8ee10d6292
1 changed files with 11 additions and 4 deletions
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15
drivers/usb/host/ehci-dbg.c
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@ -436,7 +436,8 @@ static void qh_lines (
scratch = hc32_to_cpup(ehci, &hw->hw_info1);
hw_curr = (mark == '*') ? hc32_to_cpup(ehci, &hw->hw_current) : 0;
temp = scnprintf (next, size,
"qh/%p dev%d %cs ep%d %08x %08x (%08x%c %s nak%d)",
"qh/%p dev%d %cs ep%d %08x %08x (%08x%c %s nak%d)"
" [cur %08x next %08x buf[0] %08x]",
qh, scratch & 0x007f,
speed_char (scratch),
(scratch >> 8) & 0x000f,
@ -444,7 +445,10 @@ static void qh_lines (
hc32_to_cpup(ehci, &hw->hw_token), mark,
(cpu_to_hc32(ehci, QTD_TOGGLE) & hw->hw_token)
? "data1" : "data0",
(hc32_to_cpup(ehci, &hw->hw_alt_next) >> 1) & 0x0f);
(hc32_to_cpup(ehci, &hw->hw_alt_next) >> 1) & 0x0f,
hc32_to_cpup(ehci, &hw->hw_current),
hc32_to_cpup(ehci, &hw->hw_qtd_next),
hc32_to_cpup(ehci, &hw->hw_buf[0]));
size -= temp;
next += temp;
@ -464,7 +468,8 @@ static void qh_lines (
mark = '/';
}
temp = snprintf (next, size,
"\n\t%p%c%s len=%d %08x urb %p",
"\n\t%p%c%s len=%d %08x urb %p"
" [td %08x buf[0] %08x]",
td, mark, ({ char *tmp;
switch ((scratch>>8)&0x03) {
case 0: tmp = "out"; break;
@ -474,7 +479,9 @@ static void qh_lines (
} tmp;}),
(scratch >> 16) & 0x7fff,
scratch,
td->urb);
td->urb,
(u32) td->qtd_dma,
hc32_to_cpup(ehci, &td->hw_buf[0]));
if (size < temp)
temp = size;
size -= temp;