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author | Chris Wilson <chris@chris-wilson.co.uk> | 2016-08-05 09:14:11 (GMT) |
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committer | Chris Wilson <chris@chris-wilson.co.uk> | 2016-08-05 09:54:37 (GMT) |
commit | dcff85c8443e7ad6abda897678d2fd5a950a64ad (patch) | |
tree | c987564351548f418b3d66c536c83f04fe283479 /drivers/gpu/drm/i915/intel_engine_cs.c | |
parent | 90f4fcd56bda1f52381bbd5034e8fb32688e779b (diff) | |
download | linux-dcff85c8443e7ad6abda897678d2fd5a950a64ad.tar.xz |
drm/i915: Enable i915_gem_wait_for_idle() without holding struct_mutex
The principal motivation for this was to try and eliminate the
struct_mutex from i915_gem_suspend - but we still need to hold the mutex
current for the i915_gem_context_lost(). (The issue there is that there
may be an indirect lockdep cycle between cpu_hotplug (i.e. suspend) and
struct_mutex via the stop_machine().) For the moment, enabling last
request tracking for the engine, allows us to do busyness checking and
waiting without requiring the struct_mutex - which is useful in its own
right.
As a side-effect of having a robust means for tracking engine busyness,
we can replace our other busyness heuristic, that of comparing against
the last submitted seqno. For paranoid reasons, we have a semi-ordered
check of that seqno inside the hangchecker, which we can now improve to
an ordered check of the engine's busyness (removing a locked xchg in the
process).
v2: Pass along "bool interruptible" as being unlocked we cannot rely on
i915->mm.interruptible being stable or even under our control.
v3: Replace check Ironlake i915_gpu_busy() with the common precalculated value
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1470388464-28458-6-git-send-email-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/intel_engine_cs.c')
-rw-r--r-- | drivers/gpu/drm/i915/intel_engine_cs.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c index f495969..e9b301a 100644 --- a/drivers/gpu/drm/i915/intel_engine_cs.c +++ b/drivers/gpu/drm/i915/intel_engine_cs.c @@ -166,6 +166,12 @@ void intel_engine_init_hangcheck(struct intel_engine_cs *engine) memset(&engine->hangcheck, 0, sizeof(engine->hangcheck)); } +static void intel_engine_init_requests(struct intel_engine_cs *engine) +{ + init_request_active(&engine->last_request, NULL); + INIT_LIST_HEAD(&engine->request_list); +} + /** * intel_engines_setup_common - setup engine state not requiring hw access * @engine: Engine to setup. @@ -177,13 +183,13 @@ void intel_engine_init_hangcheck(struct intel_engine_cs *engine) */ void intel_engine_setup_common(struct intel_engine_cs *engine) { - INIT_LIST_HEAD(&engine->request_list); INIT_LIST_HEAD(&engine->buffers); INIT_LIST_HEAD(&engine->execlist_queue); spin_lock_init(&engine->execlist_lock); engine->fence_context = fence_context_alloc(1); + intel_engine_init_requests(engine); intel_engine_init_hangcheck(engine); i915_gem_batch_pool_init(engine, &engine->batch_pool); } |