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drm/i915: Use fault-injection to force the shrinker to run in live GTT tests

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It is possible whilst allocating the page-directory tree for a ppgtt
bind that the shrinker may run and reap unused parts of the tree. If the
shrinker happens to remove a chunk of the tree that the
allocate_va_range has already processed, we may then try to insert into
the dangling tree. This test uses the fault-injection framework to force
the shrinker to be invoked before we allocate new pages, i.e. new chunks
of the PD tree.

References: https://bugs.freedesktop.org/show_bug.cgi?id=99295
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
This commit is contained in:
Chris Wilson
2017-02-13 17:15:44 +00:00
parent 4a6f13fce1
commit aae4a3d811
5 changed files with 109 additions and 0 deletions
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1
drivers/gpu/drm/i915/Kconfig.debug
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@@ -65,6 +65,7 @@ config DRM_I915_SELFTEST
bool "Enable selftests upon driver load"
depends on DRM_I915
default n
select FAULT_INJECTION
select PRIME_NUMBERS
help
Choose this option to allow the driver to perform selftests upon