[Intel-gfx] [PATCH v3 01/14] drm/i915: Give each sw_fence its own lockclass

[Tvrtko Ursulin]

On 14/11/2016 08:56, Chris Wilson wrote:
> Localise the static struct lock_class_key to the caller of
> i915_sw_fence_init() so that we create a lock_class instance for each
> unique sw_fence rather than all sw_fences sharing the same
> lock_class. This eliminate some lockdep false positive when using fences
> from within fence callbacks.
>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

This one had Joonas' r-b.

Regads,

Tvrtko

> ---
>  drivers/gpu/drm/i915/i915_sw_fence.c |  7 +++++--
>  drivers/gpu/drm/i915/i915_sw_fence.h | 11 ++++++++++-
>  2 files changed, 15 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_sw_fence.c b/drivers/gpu/drm/i915/i915_sw_fence.c
> index 95f2f12e0917..147420ccf49c 100644
> --- a/drivers/gpu/drm/i915/i915_sw_fence.c
> +++ b/drivers/gpu/drm/i915/i915_sw_fence.c
> @@ -116,11 +116,14 @@ static void i915_sw_fence_await(struct i915_sw_fence *fence)
>  	WARN_ON(atomic_inc_return(&fence->pending) <= 1);
>  }
>
> -void i915_sw_fence_init(struct i915_sw_fence *fence, i915_sw_fence_notify_t fn)
> +void __i915_sw_fence_init(struct i915_sw_fence *fence,
> +			  i915_sw_fence_notify_t fn,
> +			  const char *name,
> +			  struct lock_class_key *key)
>  {
>  	BUG_ON((unsigned long)fn & ~I915_SW_FENCE_MASK);
>
> -	init_waitqueue_head(&fence->wait);
> +	__init_waitqueue_head(&fence->wait, name, key);
>  	kref_init(&fence->kref);
>  	atomic_set(&fence->pending, 1);
>  	fence->flags = (unsigned long)fn;
> diff --git a/drivers/gpu/drm/i915/i915_sw_fence.h b/drivers/gpu/drm/i915/i915_sw_fence.h
> index 707dfc4f0da5..a5546eb2b5cd 100644
> --- a/drivers/gpu/drm/i915/i915_sw_fence.h
> +++ b/drivers/gpu/drm/i915/i915_sw_fence.h
> @@ -40,7 +40,16 @@ typedef int (*i915_sw_fence_notify_t)(struct i915_sw_fence *,
>  				      enum i915_sw_fence_notify state);
>  #define __i915_sw_fence_call __aligned(4)
>
> -void i915_sw_fence_init(struct i915_sw_fence *fence, i915_sw_fence_notify_t fn);
> +void __i915_sw_fence_init(struct i915_sw_fence *fence,
> +			  i915_sw_fence_notify_t fn,
> +			  const char *name,
> +			  struct lock_class_key *key);
> +#define i915_sw_fence_init(fence, fn) do {			\
> +	static struct lock_class_key __key; 			\
> +								\
> +	__i915_sw_fence_init((fence), fn, #fence, &__key);	\
> +} while (0)
> +
>  void i915_sw_fence_commit(struct i915_sw_fence *fence);
>
>  int i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence,
>