From bb89485e999181a329cafa8e798b6bbf10c1a52a Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Mon, 14 Nov 2016 20:40:57 +0000 Subject: [PATCH] drm/i915: Create distinct lockclasses for execution vs user timelines In order to simplify the lockdep annotation, as they become more complex in the future with deferred execution and multiple paths through the same functions, create a separate lockclass for the user timeline and the hardware execution timeline. We should only ever be locking the user timeline and the execution timeline in parallel so we only need to create two lock classes, rather than a separate class for every timeline. v2: Rename the lock classes to be more consistent with other lockdep. Signed-off-by: Chris Wilson Reviewed-by: Joonas Lahtinen Link: http://patchwork.freedesktop.org/patch/msgid/20161114204105.29171-2-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/i915_gem.c | 4 +-- drivers/gpu/drm/i915/i915_gem_request.c | 2 +- drivers/gpu/drm/i915/i915_gem_timeline.c | 33 +++++++++++++++++++++--- drivers/gpu/drm/i915/i915_gem_timeline.h | 1 + 4 files changed, 32 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index ed4465d22dde..a6ae3efd1d6a 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -4432,9 +4432,7 @@ i915_gem_load_init(struct drm_device *dev) mutex_lock(&dev_priv->drm.struct_mutex); INIT_LIST_HEAD(&dev_priv->gt.timelines); - err = i915_gem_timeline_init(dev_priv, - &dev_priv->gt.global_timeline, - "[execution]"); + err = i915_gem_timeline_init__global(dev_priv); mutex_unlock(&dev_priv->drm.struct_mutex); if (err) goto err_requests; diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c index 5050464c5401..f25b537d6e64 100644 --- a/drivers/gpu/drm/i915/i915_gem_request.c +++ b/drivers/gpu/drm/i915/i915_gem_request.c @@ -346,7 +346,7 @@ submit_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state) request->ring->vaddr + request->postfix); engine->submit_request(request); - spin_lock_nested(&request->timeline->lock, SINGLE_DEPTH_NESTING); + spin_lock(&request->timeline->lock); list_move_tail(&request->link, &timeline->requests); spin_unlock(&request->timeline->lock); diff --git a/drivers/gpu/drm/i915/i915_gem_timeline.c b/drivers/gpu/drm/i915/i915_gem_timeline.c index fc8f13a79f8f..bf8a471b61e6 100644 --- a/drivers/gpu/drm/i915/i915_gem_timeline.c +++ b/drivers/gpu/drm/i915/i915_gem_timeline.c @@ -24,9 +24,11 @@ #include "i915_drv.h" -int i915_gem_timeline_init(struct drm_i915_private *i915, - struct i915_gem_timeline *timeline, - const char *name) +static int __i915_gem_timeline_init(struct drm_i915_private *i915, + struct i915_gem_timeline *timeline, + const char *name, + struct lock_class_key *lockclass, + const char *lockname) { unsigned int i; u64 fences; @@ -47,8 +49,11 @@ int i915_gem_timeline_init(struct drm_i915_private *i915, tl->fence_context = fences++; tl->common = timeline; - +#ifdef CONFIG_DEBUG_SPINLOCK + __raw_spin_lock_init(&tl->lock.rlock, lockname, lockclass); +#else spin_lock_init(&tl->lock); +#endif init_request_active(&tl->last_request, NULL); INIT_LIST_HEAD(&tl->requests); } @@ -56,6 +61,26 @@ int i915_gem_timeline_init(struct drm_i915_private *i915, return 0; } +int i915_gem_timeline_init(struct drm_i915_private *i915, + struct i915_gem_timeline *timeline, + const char *name) +{ + static struct lock_class_key class; + + return __i915_gem_timeline_init(i915, timeline, name, + &class, "&timeline->lock"); +} + +int i915_gem_timeline_init__global(struct drm_i915_private *i915) +{ + static struct lock_class_key class; + + return __i915_gem_timeline_init(i915, + &i915->gt.global_timeline, + "[execution]", + &class, "&global_timeline->lock"); +} + void i915_gem_timeline_fini(struct i915_gem_timeline *tl) { lockdep_assert_held(&tl->i915->drm.struct_mutex); diff --git a/drivers/gpu/drm/i915/i915_gem_timeline.h b/drivers/gpu/drm/i915/i915_gem_timeline.h index f2bf7b1d49a1..98d99a62b4ae 100644 --- a/drivers/gpu/drm/i915/i915_gem_timeline.h +++ b/drivers/gpu/drm/i915/i915_gem_timeline.h @@ -67,6 +67,7 @@ struct i915_gem_timeline { int i915_gem_timeline_init(struct drm_i915_private *i915, struct i915_gem_timeline *tl, const char *name); +int i915_gem_timeline_init__global(struct drm_i915_private *i915); void i915_gem_timeline_fini(struct i915_gem_timeline *tl); #endif -- GitLab