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9011f0667c
According to Documentation/PCI/pci-error-recovery.rst, the following shall occur on failure to recover from a PCIe Uncorrectable Error: STEP 6: Permanent Failure ------------------------- A "permanent failure" has occurred, and the platform cannot recover the device. The platform will call error_detected() with a pci_channel_state_t value of pci_channel_io_perm_failure. The device driver should, at this point, assume the worst. It should cancel all pending I/O, refuse all new I/O, returning -EIO to higher layers. The device driver should then clean up all of its memory and remove itself from kernel operations, much as it would during system shutdown. Sathya notes that AER does not call error_detected() on failure and thus deviates from the document (as well as EEH, for which the document was originally added). Most drivers do nothing on permanent failure, but the SCSI drivers and a number of Ethernet drivers do take advantage of the notification to flush queues and give up resources. Amend AER to notify such drivers and align with the documentation and EEH. Link: https://lore.kernel.org/r/f496fc0f-64d7-46a4-8562-dba74e31a956@linux.intel.com/ Suggested-by: Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@linux.intel.com> Signed-off-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Link: https://patch.msgid.link/ec212d4d4f5c65d29349df33acdc9768ff8279d1.1755008151.git.lukas@wunner.de |
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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 reStructuredText 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.