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drm/i915: Split i915_gem_timeline into individual timelines

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We need to move to a more flexible timeline that doesn't assume one
fence context per engine, and so allow for a single timeline to be used
across a combination of engines. This means that preallocating a fence
context per engine is now a hindrance, and so we want to introduce the
singular timeline. From the code perspective, this has the notable
advantage of clearing up a lot of mirky semantics and some clumsy
pointer chasing.

By splitting the timeline up into a single entity rather than an array
of per-engine timelines, we can realise the goal of the previous patch
of tracking the timeline alongside the ring.

v2: Tweak wait_for_idle to stop the compiling thinking that ret may be
uninitialised.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180502163839.3248-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2018-05-02 17:38:39 +01:00
parent 65fcb8064d
commit a89d1f921c
24 changed files with 397 additions and 582 deletions
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3
drivers/gpu/drm/i915/i915_request.h
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@@ -37,6 +37,7 @@
struct drm_file;
struct drm_i915_gem_object;
struct i915_request;
struct i915_timeline;
struct intel_wait {
struct rb_node node;
@@ -95,7 +96,7 @@ struct i915_request {
struct i915_gem_context *ctx;
struct intel_engine_cs *engine;
struct intel_ring *ring;
struct intel_timeline *timeline;
struct i915_timeline *timeline;
struct intel_signal_node signaling;
/*