[Bug 107861] [CI][BAT] [byt full-ppgtt] igt at gem_exec* - fail - Failed assertion: !"GPU hung"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107861

--- Comment #3 from Chris Wilson <chris at chris-wilson.co.uk> ---
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.

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