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author | Michel Thierry <michel.thierry@intel.com> | 2015-04-15 18:11:33 +0100 |
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committer | Jani Nikula <jani.nikula@intel.com> | 2015-04-23 23:56:52 +0300 |
commit | 53292cdb066950611e5bc2e0eb109c7edb42af78 (patch) | |
tree | 2c2b0ed161701386dfff4000b084d9289c8eca97 /drivers/gpu/drm/r128 | |
parent | 9535c4757b881e06fae72a857485ad57c422b8d2 (diff) | |
download | linux-53292cdb066950611e5bc2e0eb109c7edb42af78.tar.bz2 |
drm/i915: Workaround to avoid lite restore with HEAD==TAIL
WaIdleLiteRestore is an execlists-only workaround, and requires the driver
to ensure that any context always has HEAD!=TAIL when attempting lite
restore.
Add two extra MI_NOOP instructions at the end of each request, but keep
the requests tail pointing before the MI_NOOPs. We may not need to
executed them, and this is why request->tail is sampled before adding
these extra instructions.
If we submit a context to the ELSP which has previously been submitted,
move the tail pointer past the MI_NOOPs. This ensures HEAD!=TAIL.
v2: Move overallocation to gen8_emit_request, and added note about
sampling request->tail in commit message (Chris).
v3: Remove redundant request->tail assignment in __i915_add_request, in
lrc mode this is already set in execlists_context_queue.
Do not add wa implementation details inside gem (Chris).
v4: Apply the wa whenever the req has been resubmitted and update
comment (Chris).
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Thomas Daniel <thomas.daniel@intel.com>
Signed-off-by: Michel Thierry <michel.thierry@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Diffstat (limited to 'drivers/gpu/drm/r128')
0 files changed, 0 insertions, 0 deletions