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* [PATCH v2 0/2] pci: Add boot interrupt quirk mechanism for Xeon chipsets
@ 2020-02-20 19:29 Sean V Kelley
  2020-02-20 19:29 ` [PATCH v2 1/2] " Sean V Kelley
                   ` (3 more replies)
  0 siblings, 4 replies; 12+ messages in thread
From: Sean V Kelley @ 2020-02-20 19:29 UTC (permalink / raw)
  To: tglx, bhelgaas, corbet, mingo, bp
  Cc: x86, linux-pci, linux-kernel, linux-doc, kar.hin.ong, sassmann,
	Sean V Kelley

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

--
2.25.1


^ permalink raw reply	[flat|nested] 12+ messages in thread

end of thread, other threads:[~2022-09-28  8:34 UTC | newest]

Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-02-20 19:29 [PATCH v2 0/2] pci: Add boot interrupt quirk mechanism for Xeon chipsets Sean V Kelley
2020-02-20 19:29 ` [PATCH v2 1/2] " Sean V Kelley
2020-02-20 19:29 ` [PATCH v2 2/2] Documentation:PCI: Add background on Boot Interrupts Sean V Kelley
2020-02-27 22:49 ` [PATCH v2 0/2] pci: Add boot interrupt quirk mechanism for Xeon chipsets Bjorn Helgaas
     [not found] ` <b2da25c8-121a-b241-c028-68e49bab0081@tik.uni-stuttgart.de>
2020-11-25 11:54   ` boot interrupt quirk (also in 4.19.y) breaks serial ports (was: [PATCH v2 0/2] pci: Add boot interrupt quirk mechanism for Xeon chipsets) Thomas Gleixner
2020-11-25 13:41     ` Stefan Bühler
2020-11-26 23:45       ` Thomas Gleixner
2020-11-27  9:17         ` Stefan Bühler
2020-11-30 10:48           ` Thomas Gleixner
2022-09-23 19:20   ` Grzegorz Halat
2022-09-26 21:17     ` Bjorn Helgaas
2022-09-28  8:34     ` boot interrupt quirk (also in 4.19.y) breaks serial ports (was: [PATCH v2 0/2] pci: Add boot interrupt quirk mechanism for Xeon chipsets) #forregzbot Thorsten Leemhuis

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