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drm/i915/gt: Assert the kernel context is using the HWSP

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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 <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200714114419.28713-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2020-07-14 12:44:19 +01:00
parent d45171ac18
commit 2a19abb006
1 changed files with 1 additions and 0 deletions
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drivers/gpu/drm/i915/gt/intel_engine_pm.c
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@ -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)