From e60a870d7f83517e583e6094ff5646d3a8d732db Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Thu, 2 Mar 2017 11:51:30 +0000 Subject: [PATCH] drm/i915: Assert that fence->lock is held in an irq-safe manner Everytime we take the fence->lock (aka request->lock), we must do so with irqs disabled since it may be used from within an hardirq context. As sometimes we are taking the lock in a nested manner, assert that the caller did disable the irqs for us. Signed-off-by: Chris Wilson Cc: Tvrtko Ursulin Cc: Mika Kuoppala Cc: Joonas Lahtinen Link: http://patchwork.freedesktop.org/patch/msgid/20170302115130.28434-1-chris@chris-wilson.co.uk Reviewed-by: Joonas Lahtinen --- drivers/gpu/drm/i915/i915_gem_request.c | 5 ++++- drivers/gpu/drm/i915/intel_breadcrumbs.c | 2 ++ 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c index 77c3ee7a3fd0..582471c00fce 100644 --- a/drivers/gpu/drm/i915/i915_gem_request.c +++ b/drivers/gpu/drm/i915/i915_gem_request.c @@ -400,12 +400,14 @@ void __i915_gem_request_submit(struct drm_i915_gem_request *request) struct intel_timeline *timeline; u32 seqno; + GEM_BUG_ON(!irqs_disabled()); + assert_spin_locked(&engine->timeline->lock); + trace_i915_gem_request_execute(request); /* Transfer from per-context onto the global per-engine timeline */ timeline = engine->timeline; GEM_BUG_ON(timeline == request->timeline); - assert_spin_locked(&timeline->lock); seqno = timeline_get_seqno(timeline); GEM_BUG_ON(!seqno); @@ -446,6 +448,7 @@ void __i915_gem_request_unsubmit(struct drm_i915_gem_request *request) struct intel_engine_cs *engine = request->engine; struct intel_timeline *timeline; + GEM_BUG_ON(!irqs_disabled()); assert_spin_locked(&engine->timeline->lock); /* Only unwind in reverse order, required so that the per-context list diff --git a/drivers/gpu/drm/i915/intel_breadcrumbs.c b/drivers/gpu/drm/i915/intel_breadcrumbs.c index 5752f23fd289..ba54dd1949e8 100644 --- a/drivers/gpu/drm/i915/intel_breadcrumbs.c +++ b/drivers/gpu/drm/i915/intel_breadcrumbs.c @@ -653,6 +653,7 @@ void intel_engine_enable_signaling(struct drm_i915_gem_request *request) */ /* locked by dma_fence_enable_sw_signaling() (irqsafe fence->lock) */ + GEM_BUG_ON(!irqs_disabled()); assert_spin_locked(&request->lock); seqno = i915_gem_request_global_seqno(request); @@ -709,6 +710,7 @@ void intel_engine_cancel_signaling(struct drm_i915_gem_request *request) struct intel_engine_cs *engine = request->engine; struct intel_breadcrumbs *b = &engine->breadcrumbs; + GEM_BUG_ON(!irqs_disabled()); assert_spin_locked(&request->lock); GEM_BUG_ON(!request->signaling.wait.seqno); -- 2.20.1