[PATCH 47/49] drm/i915/guc: Disable global reset

Chris Wilson chris at chris-wilson.co.uk
Fri Oct 5 14:33:40 UTC 2018

The guc (and huc) currently inexcruitably depend on struct_mutex for
device reinitialisation from inside the reset, and indeed taking any
mutex here is verboten (as we must be able to reset from underneath any
of our mutexes). That makes recovering the guc unviable without, for
example, reserving contiguous vma space and pages for it to use.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
 drivers/gpu/drm/i915/i915_reset.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_reset.c b/drivers/gpu/drm/i915/i915_reset.c
index f002ef17e859..79386221a8b0 100644
--- a/drivers/gpu/drm/i915/i915_reset.c
+++ b/drivers/gpu/drm/i915/i915_reset.c
@@ -485,6 +485,9 @@ int intel_gpu_reset(struct drm_i915_private *i915, unsigned int engine_mask)
 bool intel_has_gpu_reset(struct drm_i915_private *i915)
+	if (USES_GUC(i915))
+		return false;
 	return intel_get_gpu_reset(i915);

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