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PCI: Report quirks that take more than 10ms 

With "initcall_debug", we report how long every PCI quirk took.

Even without "initcall_debug", report the runtime of any quirk that takes
longer than 10ms.  This is to make it easier to notice quirks that slow
down boot.

This was motivated by a report from Paul Menzel that PCI final quirks took
half a second at boot.

Link: https://lkml.kernel.org/r/44cada166e42007d27b4c3e3aa0744d7@molgen.mpg.de
Reported-by: Paul Menzel <pmenzel@molgen.mpg.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Bjorn Helgaas 2018-03-14 07:52:30 -05:00 committed by Bjorn Helgaas
parent d89bd9195d
commit 6846b3b512
1 changed files with 6 additions and 11 deletions
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17
drivers/pci/quirks.c
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@ -3104,14 +3104,10 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0e0d, quirk_intel_ntb);
static ktime_t fixup_debug_start(struct pci_dev *dev,
void (*fn)(struct pci_dev *dev))
{
ktime_t calltime = 0;
if (initcall_debug) {
if (initcall_debug)
pci_info(dev, "calling %pF @ %i\n", fn, task_pid_nr(current));
calltime = ktime_get();
}
return calltime;
return ktime_get();
}
static void fixup_debug_report(struct pci_dev *dev, ktime_t calltime,
@ -3120,12 +3116,11 @@ static void fixup_debug_report(struct pci_dev *dev, ktime_t calltime,
ktime_t delta, rettime;
unsigned long long duration;
if (initcall_debug) {
rettime = ktime_get();
delta = ktime_sub(rettime, calltime);
duration = (unsigned long long) ktime_to_ns(delta) >> 10;
rettime = ktime_get();
delta = ktime_sub(rettime, calltime);
duration = (unsigned long long) ktime_to_ns(delta) >> 10;
if (initcall_debug || duration > 10000)
pci_info(dev, "%pF took %lld usecs\n", fn, duration);
}
}
/*