Philip Yang 373e3ccd85 drm/amdkfd: handle stale retry fault
Retry fault interrupt maybe pending in IH ring after GPU page table
is updated to recover the vm fault, because each page of the range
generate retry fault interrupt. There is race if application unmap
range to remove and free the range first and then retry fault work
restore_pages handle the retry fault interrupt, because range can not be
found, this vm fault can not be recovered and report incorrect GPU vm
fault to application.

Before unmap to remove and free range, drain retry fault interrupt
from IH ring1 to ensure no retry fault comes after the range is removed.

Drain retry fault interrupt skip the range which is on deferred list
to remove, or the range is child range, which is split by unmap, does
not add to svms and have interval notifier.

Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2021-04-28 23:36:05 -04:00
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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 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.
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