Commit a588332f authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab Committed by Jonathan Corbet

docs: pci: boot-interrupts.rst: improve html output

There are some warnings with this file:

    /Documentation/PCI/boot-interrupts.rst:42: WARNING: Unexpected indentation.
    /Documentation/PCI/boot-interrupts.rst:52: WARNING: Block quote ends without a blank line; unexpected unindent.
    /Documentation/PCI/boot-interrupts.rst:92: WARNING: Unexpected indentation.
    /Documentation/PCI/boot-interrupts.rst:98: WARNING: Unexpected indentation.
    /Documentation/PCI/boot-interrupts.rst:136: WARNING: Unexpected indentation.

It turns that this file conversion to ReST could be improved,
in order to remove the warnings and provide a better output.

So, fix the warnings by adjusting blank lines, add a table and
some list markups. Also, mark endnodes as such.
Acked-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/a6a9eb16eede10731bcce69a600ab12d92e6ba47.1586881715.git.mchehab+huawei@kernel.orgSigned-off-by: default avatarJonathan Corbet <corbet@lwn.net>
parent 877a37d3
......@@ -32,12 +32,13 @@ interrupt goes unhandled over time, they are tracked by the Linux kernel as
Spurious Interrupts. The IRQ will be disabled by the Linux kernel after it
reaches a specific count with the error "nobody cared". This disabled IRQ
now prevents valid usage by an existing interrupt which may happen to share
the IRQ line.
the IRQ line::
irq 19: nobody cared (try booting with the "irqpoll" option)
CPU: 0 PID: 2988 Comm: irq/34-nipalk Tainted: 4.14.87-rt49-02410-g4a640ec-dirty #1
Hardware name: National Instruments NI PXIe-8880/NI PXIe-8880, BIOS 2.1.5f1 01/09/2020
Call Trace:
<IRQ>
? dump_stack+0x46/0x5e
? __report_bad_irq+0x2e/0xb0
......@@ -85,15 +86,18 @@ Mitigations
The mitigations take the form of PCI quirks. The preference has been to
first identify and make use of a means to disable the routing to the PCH.
In such a case a quirk to disable boot interrupt generation can be
added.[1]
added. [1]_
Intel® 6300ESB I/O Controller Hub
Intel® 6300ESB I/O Controller Hub
Alternate Base Address Register:
BIE: Boot Interrupt Enable
0 = Boot interrupt is enabled.
1 = Boot interrupt is disabled.
Intel® Sandy Bridge through Sky Lake based Xeon servers:
== ===========================
0 Boot interrupt is enabled.
1 Boot interrupt is disabled.
== ===========================
Intel® Sandy Bridge through Sky Lake based Xeon servers:
Coherent Interface Protocol Interrupt Control
dis_intx_route2pch/dis_intx_route2ich/dis_intx_route2dmi2:
When this bit is set. Local INTx messages received from the
......@@ -109,12 +113,12 @@ line by default. Therefore, on chipsets where this INTx routing cannot be
disabled, the Linux kernel will reroute the valid interrupt to its legacy
interrupt. This redirection of the handler will prevent the occurrence of
the spurious interrupt detection which would ordinarily disable the IRQ
line due to excessive unhandled counts.[2]
line due to excessive unhandled counts. [2]_
The config option X86_REROUTE_FOR_BROKEN_BOOT_IRQS exists to enable (or
disable) the redirection of the interrupt handler to the PCH interrupt
line. The option can be overridden by either pci=ioapicreroute or
pci=noioapicreroute.[3]
pci=noioapicreroute. [3]_
More Documentation
......@@ -127,19 +131,19 @@ into the evolution of its handling with chipsets.
Example of disabling of the boot interrupt
------------------------------------------
Intel® 6300ESB I/O Controller Hub (Document # 300641-004US)
- Intel® 6300ESB I/O Controller Hub (Document # 300641-004US)
5.7.3 Boot Interrupt
https://www.intel.com/content/dam/doc/datasheet/6300esb-io-controller-hub-datasheet.pdf
Intel® Xeon® Processor E5-1600/2400/2600/4600 v3 Product Families
Datasheet - Volume 2: Registers (Document # 330784-003)
- Intel® Xeon® Processor E5-1600/2400/2600/4600 v3 Product Families
Datasheet - Volume 2: Registers (Document # 330784-003)
6.6.41 cipintrc Coherent Interface Protocol Interrupt Control
https://www.intel.com/content/dam/www/public/us/en/documents/datasheets/xeon-e5-v3-datasheet-vol-2.pdf
Example of handler rerouting
----------------------------
Intel® 6700PXH 64-bit PCI Hub (Document # 302628)
- Intel® 6700PXH 64-bit PCI Hub (Document # 302628)
2.15.2 PCI Express Legacy INTx Support and Boot Interrupt
https://www.intel.com/content/dam/doc/datasheet/6700pxh-64-bit-pci-hub-datasheet.pdf
......@@ -150,6 +154,6 @@ Cheers,
Sean V Kelley
sean.v.kelley@linux.intel.com
[1] https://lore.kernel.org/r/12131949181903-git-send-email-sassmann@suse.de/
[2] https://lore.kernel.org/r/12131949182094-git-send-email-sassmann@suse.de/
[3] https://lore.kernel.org/r/487C8EA7.6020205@suse.de/
.. [1] https://lore.kernel.org/r/12131949181903-git-send-email-sassmann@suse.de/
.. [2] https://lore.kernel.org/r/12131949182094-git-send-email-sassmann@suse.de/
.. [3] https://lore.kernel.org/r/487C8EA7.6020205@suse.de/
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