Quoting Tvrtko Ursulin (2020-07-13 11:19:58)
On 11/07/2020 21:32, Chris Wilson wrote:
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@chris-wilson.co.uk Cc: Mika Kuoppala mika.kuoppala@linux.intel.com Cc: Tvrtko Ursulin tvrtko.ursulin@intel.com Cc: stable@vger.kernel.org # 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;Add a comment here saying this is a hack and why please. With that:
"This is a lot simpler than splitting breadcrumbs, although we do need to do that. But that was becoming a very hairy patch." -Chris