[Bug 99977] [SNB] [i915] GPU HANG: ecode 6:0:0x85fffffc, in aquaria [2893], reason: Hang on render ring, action: reset

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99977

--- Comment #9 from Chris Wilson <chris at chris-wilson.co.uk> ---
Ok, same error pops out:

ERROR: 0x00000012
    Context page GTT translation generated a fault (GTT entry not valid)
    TLB page VTD translation generated an error


Try:
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c
b/drivers/gpu/drm/i915/i915_gem_context.c
index 6827a85408bf..0910f59dfddf 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -105,6 +105,7 @@ static int get_context_size(struct drm_i915_private
*dev_priv)
        case 6:
                reg = I915_READ(CXT_SIZE);
                ret = GEN6_CXT_TOTAL_SIZE(reg) * 64;
+               ret = 18 * PAGE_SIZE;
                break;
        case 7:
                reg = I915_READ(GEN7_CXT_SIZE);

Something else to try is intel_iommu=igfx-off

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