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Jörg Wedekind 1dee290109 PCI: Mark 3ware-9650SE Root Port Extended Tags as broken 
[ Upstream commit baf67aefbe ]

Per PCIe r6.1, sec 2.2.6.2 and 7.5.3.4, a Requester may not use 8-bit Tags
unless its Extended Tag Field Enable is set, but all Receivers/Completers
must handle 8-bit Tags correctly regardless of their Extended Tag Field
Enable.

Some devices do not handle 8-bit Tags as Completers, so add a quirk for
them.  If we find such a device, we disable Extended Tags for the entire
hierarchy to make peer-to-peer DMA possible.

The 3ware 9650SE seems to have issues with handling 8-bit tags. Mark it as
broken.

This fixes PCI Parity Errors like :

  3w-9xxx: scsi0: ERROR: (0x06:0x000C): PCI Parity Error: clearing.
  3w-9xxx: scsi0: ERROR: (0x06:0x000D): PCI Abort: clearing.
  3w-9xxx: scsi0: ERROR: (0x06:0x000E): Controller Queue Error: clearing.
  3w-9xxx: scsi0: ERROR: (0x06:0x0010): Microcontroller Error: clearing.

Link: https://lore.kernel.org/r/20240219132811.8351-1-joerg@wedekind.de
Fixes: 60db3a4d8c ("PCI: Enable PCIe Extended Tags if supported")
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=202425
Signed-off-by: Jörg Wedekind <joerg@wedekind.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2024-03-26 18:19:50 -04:00
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README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.