On Mon, 16 May 2011 17:26:42 -0600
Myron Stowe <myron.stowe@xxxxxxxxx> wrote:
> On Wed, May 11, 2011 at 4:21 PM, Jesse Barnes
> <jbarnes@xxxxxxxxxxxxxxxx> wrote:
> > Latency tolerance reporting allows devices to send messages to the
> > root complex indicating their latency tolerance for snooped &
> > unsnooped memory transactions. Add support for enabling &
> > disabling this feature, along with a routine to set the max
> > latencies a device should send upstream.
> >
> > Signed-off-by: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
> > ---
> > drivers/pci/pci.c | 149
> > ++++++++++++++++++++++++++++++++++++++++++++++ include/linux/pci.h
> > | 5 ++ include/linux/pci_regs.h | 9 +++
> > 3 files changed, 163 insertions(+), 0 deletions(-)
> >
> > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> > index 01e4cab..53302cb 100644
> > --- a/drivers/pci/pci.c
> > +++ b/drivers/pci/pci.c
> > @@ -1979,6 +1979,155 @@ void pci_disable_obff(struct pci_dev *dev)
> > }
> > EXPORT_SYMBOL(pci_disable_obff);
> >
> > +/**
> > + * pci_ltr_supported - check whether a device supports LTR
> > + * @dev: PCI device
> > + *
> > + * RETURNS:
> > + * True if @dev supports latency tolerance reporting, false
> > otherwise.
> > + */
> > +bool pci_ltr_supported(struct pci_dev *dev)
> > +{
> > + int pos;
> > + u32 cap;
> > +
> > + if (!pci_is_pcie(dev))
> > + return false;
>
> Jesse,
>
> Based on Bjorn's comment to the initial posting of [PATCH 1/3] PCI:
> add ID-based ordering enable/disable support
> (http://marc.info/?l=linux-pci&m=130463494319762&w=2) you may want to
> also drop the above check both in this patch and the OBFF patch for
> consistency.
>
> Reviewed-by: Myron Stowe <myron.stowe@xxxxxxxxxx>
Ok, will do. Thanks.
Jesse
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