We do not use the virtual engines for interrupts (they have physical
components), but we do use them to decouple the fence signaling during
submission. Currently, when we submit a completed request, we try to
enable the interrupt handler for the virtual engine, but we never disarm
it. A quick fix is then to mark the irq as enabled, and it will then
remain enabled -- and this prevents us from waking the device and never
letting it sleep again.
Fixes: f8db4d051b5e ("drm/i915: Initialise breadcrumb lists on the virtual engine")
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v5.5+
---
drivers/gpu/drm/i915/gt/intel_lrc.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index cd4262cc96e2..504e269bb166 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -5727,6 +5727,7 @@ intel_execlists_create_virtual(struct intel_engine_cs **siblings,
intel_engine_init_active(&ve->base, ENGINE_VIRTUAL);
intel_engine_init_breadcrumbs(&ve->base);
intel_engine_init_execlists(&ve->base);
+ ve->base.breadcrumbs.irq_armed = true;
ve->base.cops = &virtual_context_ops;
ve->base.request_alloc = execlists_request_alloc;
--
2.20.1
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