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    SubjectRe: [PATCH v2 0/2] pci: Add boot interrupt quirk mechanism for Xeon chipsets
    On Thu, Feb 20, 2020 at 11:29:28AM -0800, Sean V Kelley wrote:
    > Changes since v1 [1]:
    >
    > - Correct Documentation section title for 6300ESB chipset.
    > (Jonathan Derrick)
    >
    > - Use consistent abbreviations in comments for IO-APIC and Core IO.
    > (Andy Shevchenko)
    >
    > - Retained Reviewed-by tag due to no technical changes.
    >
    > [1]: https://lore.kernel.org/lkml/20200214213313.66622-1-sean.v.kelley@linux.intel.com/
    >
    > Bjorn, I'm open for it to go to stable as well.
    >
    > --
    >
    > When IRQ lines on secondary or higher IO-APICs are masked (e.g.,
    > Real-Time threaded interrupts), many chipsets redirect IRQs on
    > this line to the legacy PCH and in turn the base IO-APIC in the
    > system. The unhandled interrupts on the base IO-APIC will be
    > identified by the Linux kernel as Spurious Interrupts and can
    > lead to disabled IRQ lines.
    >
    > Disabling this legacy PCI interrupt routing is chipset-specific and
    > varies in mechanism between chipset vendors and across generations.
    > In some cases the mechanism is exposed to BIOS but not all BIOS
    > vendors chose to pick it up. With the increasing usage of RT as it
    > marches towards mainline, additional issues have been raised with
    > more recent Xeon chipsets.
    >
    > This patchset disables the boot interrupt on these Xeon chipsets where
    > this is possible with an additional mechanism. In addition, this
    > patchset includes documentation covering the background of this quirk.
    >
    >
    > Sean V Kelley (2):
    > pci: Add boot interrupt quirk mechanism for Xeon chipsets
    > Documentation:PCI: Add background on Boot Interrupts
    >
    > Documentation/PCI/boot-interrupts.rst | 153 ++++++++++++++++++++++++++
    > Documentation/PCI/index.rst | 1 +
    > drivers/pci/quirks.c | 80 ++++++++++++--
    > 3 files changed, 227 insertions(+), 7 deletions(-)
    > create mode 100644 Documentation/PCI/boot-interrupts.rst

    Applied to pci/interrupts for v5.7. I added a stable tag.

    Thanks a lot; this is really a nice piece of work!

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