On Wed, 28 Aug 2013, Bjorn Helgaas wrote:
> [+cc another email addr for Adam from git logs]
Thanks. Adam, would you happen to have any possible explanation /
background?
> >> > Commit d5dea7d95 ("PCI: msi: Disable msi interrupts when we initialize a
> >> > pci device") makes MSIs be forcibly disabled at boot time.
> >> >
> >> > It turns out that this breaks 3ware controller -- if MSIs are disabled
> >> > during PCI discovery of this controller, the device doesn't work properly
> >> > (it doesn't respond to any commands that are being sent to it after
> >> > initialization).
> >> >
> >> > Reverting d5dea7d95 or not force-disabling MSIs in pci_msi_init_pci_dev()
> >> > makes the device work properly again.
> >> >
> >> > Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>
> >> >
> >> > ---
> >> >
> >> > I am adding Adam Radford as a recepient as well, to see whether he is able
> >> > to provide some more explanation why this device would expose this
> >> > behavior.
> >
> > OK, so Adam Radford's lsi.com address is bouncing, hence I guess we can't
> > expect any feedback from him.
> >
> > Bjorn, Jesse, any word on this please?
>
> It's on my list to look at. It's too late to put it in for v3.11, and
> it's doubtful that it will even make the v3.12 merge window (though
> possibly it could go in post-merge window). d5dea7d95 is several
> years old, so hopefully this issue isn't super-urgent. Let me know if
> otherwise.
I agree that this should be applicable to 3.12-rcX as well, as it's very
device-specific.
Thanks.
>
> Bjorn
>
> >> > drivers/pci/msi.c | 3 +++
> >> > drivers/pci/quirks.c | 10 ++++++++++
> >> > include/linux/pci.h | 1 +
> >> > 3 files changed, 14 insertions(+), 0 deletions(-)
> >> >
> >> > diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
> >> > index aca7578..4f36b8b 100644
> >> > --- a/drivers/pci/msi.c
> >> > +++ b/drivers/pci/msi.c
> >> > @@ -1040,6 +1040,9 @@ void pci_msi_init_pci_dev(struct pci_dev *dev)
> >> > {
> >> > INIT_LIST_HEAD(&dev->msi_list);
> >> >
> >> > + if (dev->broken_msi_disable)
> >> > + return;
> >> > +
> >> > /* Disable the msi hardware to avoid screaming interrupts
> >> > * during boot. This is the power on reset default so
> >> > * usually this should be a noop.
> >> > diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> >> > index e85d230..4ba3400 100644
> >> > --- a/drivers/pci/quirks.c
> >> > +++ b/drivers/pci/quirks.c
> >> > @@ -2890,6 +2890,16 @@ static void quirk_intel_ntb(struct pci_dev *dev)
> >> > DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0e08, quirk_intel_ntb);
> >> > DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0e0d, quirk_intel_ntb);
> >> >
> >> > +/*
> >> > + * 3ware 9650SE controller doesn't properly initialize if MSI are
> >> > + * disabled on it during PCI device discovery
> >> > + */
> >> > +static void quirk_broken_msi_disable(struct pci_dev *dev)
> >> > +{
> >> > + dev->broken_msi_disable = 1;
> >> > +}
> >> > +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_3WARE, 0x1004, quirk_broken_msi_disable);
> >> > +
> >> > static ktime_t fixup_debug_start(struct pci_dev *dev,
> >> > void (*fn)(struct pci_dev *dev))
> >> > {
> >> > diff --git a/include/linux/pci.h b/include/linux/pci.h
> >> > index 0fd1f15..c327d74 100644
> >> > --- a/include/linux/pci.h
> >> > +++ b/include/linux/pci.h
> >> > @@ -341,6 +341,7 @@ struct pci_dev {
> >> > #ifdef CONFIG_PCI_MSI
> >> > struct list_head msi_list;
> >> > struct kset *msi_kset;
> >> > + unsigned int broken_msi_disable:1;
> >> > #endif
> >> > struct pci_vpd *vpd;
> >> > #ifdef CONFIG_PCI_ATS
> >> >
> >> > --
> >> > Jiri Kosina
> >> > SUSE Labs
> >> >
> >>
> >> --
> >> Jiri Kosina
> >> SUSE Labs
> >>
> >
> > --
> > Jiri Kosina
> > SUSE Labs
>
--
Jiri Kosina
SUSE Labs
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