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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [CI][BAT] [byt full-ppgtt] igt@gem_exec* - fail - Failed assertion: !"GPU hung""
href="https://bugs.freedesktop.org/show_bug.cgi?id=107861#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [CI][BAT] [byt full-ppgtt] igt@gem_exec* - fail - Failed assertion: !"GPU hung""
href="https://bugs.freedesktop.org/show_bug.cgi?id=107861">bug 107861</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>The hilarity
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c
b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 472939f5c18f..0f4e6b29c800 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1677,9 +1677,12 @@ static int switch_context(struct i915_request *rq)
GEM_BUG_ON(HAS_EXECLISTS(rq->i915));
if (ppgtt) {
+ int loops = (engine->id == BCS && IS_VALLEYVIEW(engine->i915))
? 32 : 1;
+ do {
ret = load_pd_dir(rq, ppgtt);
if (ret)
goto err;
+ } while (--loops);
if (intel_engine_flag(engine) & ppgtt->pd_dirty_rings) {
unwind_mm = intel_engine_flag(engine);
@@ -1707,6 +1710,9 @@ static int switch_context(struct i915_request *rq)
is the most effective w/a so far. Pray I don't raise loops further.</pre>
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