From 2a19abb006292d741e670ea6be804c3a575676ce Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Tue, 14 Jul 2020 12:44:19 +0100 Subject: [PATCH] drm/i915/gt: Assert the kernel context is using the HWSP We need to ensure that the kernel context is using the permanently pinned HWSP so that we can always submit a pm request from any context. By construction, the engine->kernel_context should only be using the engine->status_page.vma so let's assert that is still true when we have to submit a request for parking the engine. Signed-off-by: Chris Wilson Cc: Tvrtko Ursulin Reviewed-by: Mika Kuoppala Link: https://patchwork.freedesktop.org/patch/msgid/20200714114419.28713-1-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/gt/intel_engine_pm.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/i915/gt/intel_engine_pm.c b/drivers/gpu/drm/i915/gt/intel_engine_pm.c index d0a1078ef632..8ec3eecf3e39 100644 --- a/drivers/gpu/drm/i915/gt/intel_engine_pm.c +++ b/drivers/gpu/drm/i915/gt/intel_engine_pm.c @@ -142,6 +142,7 @@ static bool switch_to_kernel_context(struct intel_engine_cs *engine) return true; GEM_BUG_ON(!intel_context_is_barrier(ce)); + GEM_BUG_ON(ce->timeline->hwsp_ggtt != engine->status_page.vma); /* Already inside the kernel context, safe to power down. */ if (engine->wakeref_serial == engine->serial) -- 2.17.1