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drm/i915: Perform an invalidate prior to executing golden renderstate 

As we may have just bound the renderstate into the GGTT for execution, we
need to ensure that the GTT TLB are also flushed.

On snb-gt2, this would cause a random GPU hang at the start of a new
context (e.g. boot) and on snb-gt1, it was causing the renderstate batch
to take ~10s. It was the GPU hang that revealed the truth, as the CS
gleefully executed beyond the end of the golden renderstate batch, a good
indicator for a GTT TLB miss.

Fixes: 20fe17aa52 ("drm/i915: Remove redundant TLB invalidate on switching contexts")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: stable@vger.kernel.org
Link: https://patchwork.freedesktop.org/patch/msgid/20170808131904.1385-1-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: <drm-intel-fixes@lists.freedesktop.org> # v4.12-rc1+
(cherry picked from commit 802673d66f)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Chris Wilson 2017-08-08 14:19:04 +01:00 committed by Jani Nikula
parent 26a72e8a8d
commit a0125a932e
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/i915/i915_gem_render_state.c
View File

@ -242,6 +242,10 @@ int i915_gem_render_state_emit(struct drm_i915_gem_request *req)
goto err_unpin;
}
ret = req->engine->emit_flush(req, EMIT_INVALIDATE);
if (ret)
goto err_unpin;
ret = req->engine->emit_bb_start(req,
so->batch_offset, so->batch_size,
I915_DISPATCH_SECURE);