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USB: EHCI: create per-TT bandwidth tables

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This patch continues the scheduling changes in ehci-hcd by adding a
table to store the bandwidth allocation below each TT.  This will
speed up the scheduling code, as it will no longer need to read
through the entire schedule to compute the bandwidth currently in use.

Properly speaking, the FS/LS budget calculations should be done in
terms of full-speed bytes per microframe, as described in the USB-2
spec.  However the driver currently uses microseconds per microframe,
and the scheduling code isn't robust enough at this point to change
over.  For the time being, we leave the calculations as they are.

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
2013-10-11 22:16:21 -04:00
committed by Greg Kroah-Hartman
parent ca1ad0ffca
commit b35c5009bb
4 changed files with 312 additions and 85 deletions
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48
drivers/usb/host/ehci-dbg.c
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@@ -536,10 +536,14 @@ static ssize_t fill_async_buffer(struct debug_buffer *buf)
static ssize_t fill_bandwidth_buffer(struct debug_buffer *buf)
{
struct ehci_hcd *ehci;
struct ehci_tt *tt;
struct ehci_per_sched *ps;
unsigned temp, size;
char *next;
unsigned i;
u8 *bw;
u16 *bf;
u8 budget[EHCI_BANDWIDTH_SIZE];
ehci = hcd_to_ehci(bus_to_hcd(buf->bus));
next = buf->output_buf;
@@ -563,6 +567,50 @@ static ssize_t fill_bandwidth_buffer(struct debug_buffer *buf)
size -= temp;
next += temp;
}
/* Dump all the FS/LS tables */
list_for_each_entry(tt, &ehci->tt_list, tt_list) {
temp = scnprintf(next, size,
"\nTT %s port %d FS/LS bandwidth allocation (us per frame)\n",
dev_name(&tt->usb_tt->hub->dev),
tt->tt_port + !!tt->usb_tt->multi);
size -= temp;
next += temp;
bf = tt->bandwidth;
temp = scnprintf(next, size,
" %5u%5u%5u%5u%5u%5u%5u%5u\n",
bf[0], bf[1], bf[2], bf[3],
bf[4], bf[5], bf[6], bf[7]);
size -= temp;
next += temp;
temp = scnprintf(next, size,
"FS/LS budget (us per microframe)\n");
size -= temp;
next += temp;
compute_tt_budget(budget, tt);
for (i = 0; i < EHCI_BANDWIDTH_SIZE; i += 8) {
bw = &budget[i];
temp = scnprintf(next, size,
"%2u: %4u%4u%4u%4u%4u%4u%4u%4u\n",
i, bw[0], bw[1], bw[2], bw[3],
bw[4], bw[5], bw[6], bw[7]);
size -= temp;
next += temp;
}
list_for_each_entry(ps, &tt->ps_list, ps_list) {
temp = scnprintf(next, size,
"%s ep %02x: %4u @ %2u.%u+%u mask %04x\n",
dev_name(&ps->udev->dev),
ps->ep->desc.bEndpointAddress,
ps->tt_usecs,
ps->bw_phase, ps->phase_uf,
ps->bw_period, ps->cs_mask);
size -= temp;
next += temp;
}
}
spin_unlock_irq(&ehci->lock);
return next - buf->output_buf;