Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> For conveniences of callers that just want to use an i915_active to
> track a wide array of concurrent timelines, wrap the base i915_active
> struct inside a kref. This i915_active will self-destruct after use.
>
Found the user,
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_active.c | 53 ++++++++++++++++++++++++++++++
> drivers/gpu/drm/i915/i915_active.h | 4 +++
> 2 files changed, 57 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_active.c b/drivers/gpu/drm/i915/i915_active.c
> index 7b3d6c12ad61..1826de14d2da 100644
> --- a/drivers/gpu/drm/i915/i915_active.c
> +++ b/drivers/gpu/drm/i915/i915_active.c
> @@ -881,6 +881,59 @@ void i915_active_noop(struct dma_fence *fence, struct dma_fence_cb *cb)
> active_fence_cb(fence, cb);
> }
>
> +struct auto_active {
> + struct i915_active base;
> + struct kref ref;
> +};
> +
> +struct i915_active *i915_active_get(struct i915_active *ref)
> +{
> + struct auto_active *aa = container_of(ref, typeof(*aa), base);
> +
> + kref_get(&aa->ref);
> + return &aa->base;
> +}
> +
> +static void auto_release(struct kref *ref)
> +{
> + struct auto_active *aa = container_of(ref, typeof(*aa), ref);
> +
> + i915_active_fini(&aa->base);
> + kfree(aa);
> +}
> +
> +void i915_active_put(struct i915_active *ref)
> +{
> + struct auto_active *aa = container_of(ref, typeof(*aa), base);
> +
> + kref_put(&aa->ref, auto_release);
> +}
> +
> +static int auto_active(struct i915_active *ref)
> +{
> + i915_active_get(ref);
> + return 0;
> +}
> +
> +static void auto_retire(struct i915_active *ref)
> +{
> + i915_active_put(ref);
> +}
> +
> +struct i915_active *i915_active_create(void)
> +{
> + struct auto_active *aa;
> +
> + aa = kmalloc(sizeof(*aa), GFP_KERNEL);
> + if (!aa)
> + return NULL;
> +
> + kref_init(&aa->ref);
> + i915_active_init(&aa->base, auto_active, auto_retire);
> +
> + return &aa->base;
> +}
> +
> #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
> #include "selftests/i915_active.c"
> #endif
> diff --git a/drivers/gpu/drm/i915/i915_active.h b/drivers/gpu/drm/i915/i915_active.h
> index 973ff0447c6c..7e438501333e 100644
> --- a/drivers/gpu/drm/i915/i915_active.h
> +++ b/drivers/gpu/drm/i915/i915_active.h
> @@ -215,4 +215,8 @@ void i915_request_add_active_barriers(struct i915_request *rq);
> void i915_active_print(struct i915_active *ref, struct drm_printer *m);
> void i915_active_unlock_wait(struct i915_active *ref);
>
> +struct i915_active *i915_active_create(void);
> +struct i915_active *i915_active_get(struct i915_active *ref);
> +void i915_active_put(struct i915_active *ref);
> +
> #endif /* _I915_ACTIVE_H_ */
> --
> 2.25.1
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