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f4e2deceb6
In GuC mode LRC pinning lifetime depends exclusively on the request liftime. Since that is terminated by the seqno update that opens up a race condition between GPU finishing writing out the context image and the driver unpinning the LRC. To extend the LRC lifetime we will employ a similar approach to what legacy ringbuffer submission does. We will start tracking the last submitted context per engine and keep it pinned until it is replaced by another one. Note that the driver unload path is a bit fragile and could benefit greatly from efforts to unify the legacy and exec list submission code paths. At the moment i915_gem_context_fini has special casing for the two which are potentialy not needed, and also depends on i915_gem_cleanup_ringbuffer running before itself. v2: * Move pinning into engine->emit_request and actually fix the reference/unreference logic. (Chris Wilson) * ring->dev can be NULL on driver unload so use a different route towards it. v3: * Rebase. * Handle the reset path. (Chris Wilson) * Exclude default context from the pinning - it is impossible to get it right before default context special casing in general is eliminated. v4: * Rebased & moved context tracking to intel_logical_ring_advance_and_submit. Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Issue: VIZ-4277 Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Nick Hoath <nicholas.hoath@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1453976997-25424-1-git-send-email-tvrtko.ursulin@linux.intel.com |
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