See https://chromium-review.googlesource.com/#/c/177627/ for full report and patch. "When HW context switch is enabled, the last context switched away from is stored in the ring, and when a context is unbound, the ring pointer is not updated."
Fixed (made irrelevant) by commit 112522f6789581824903f6f72082b5b841a7f0f9 Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Thu May 2 16:48:07 2013 +0300 drm/i915: put context upon switching In order to be notified of when the context and all of its associated objects is idle (for if the context maps to a ppgtt) we need a callback from the retire handler. We can arrange this by using the kref_get/put of the context for request tracking and by inserting a request to demarque the switch away from the old context. [Ben: fixed minor error to patch compile, AND s/last_context/from/] Signed-off-by: Ben Widawsky <ben@bwidawsk.net> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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