From 1f70999f9052f5a1b0ce1a55aff3808f2ec9fe42 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Mon, 27 Jan 2014 22:43:07 +0000 Subject: [PATCH] drm/i915: Prevent recursion by retiring requests when the ring is full MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit As the VM do not track activity of objects and instead use a large hammer to forcibly idle and evict all of their associated objects when one is released, it is possible for that to cause a recursion when we need to wait for free space on a ring and call retire requests. (intel_ring_begin -> intel_ring_wait_request -> i915_gem_retire_requests_ring -> i915_gem_context_free -> i915_gem_evict_vm -> i915_gpu_idle -> intel_ring_begin etc) In order to remove the requirement for calling retire-requests from intel_ring_wait_request, we have to inline a couple of steps from retiring requests, notably we have to record the position of the request we wait for and use that to update the available ring space. Signed-off-by: Chris Wilson Reviewed-by: Ville Syrjälä Signed-off-by: Daniel Vetter --- Reading git-format-patch failed