Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> This was removed in commit 478ffad6d690 ("drm/i915: drop
> engine_pin/unpin_breadcrumbs_irq") as the last user had been removed,
> but now there is a promise of a new user in the next patch.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/gt/intel_breadcrumbs.c | 22 +++++++++++++++++++++
> drivers/gpu/drm/i915/gt/intel_engine.h | 3 +++
> 2 files changed, 25 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c b/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c
> index d907d538176e..03c14ab86d95 100644
> --- a/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c
> +++ b/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c
> @@ -220,6 +220,28 @@ static void signal_irq_work(struct irq_work *work)
> }
> }
>
> +void intel_engine_pin_breadcrumbs_irq(struct intel_engine_cs *engine)
> +{
> + struct intel_breadcrumbs *b = &engine->breadcrumbs;
> +
> + spin_lock_irq(&b->irq_lock);
> + if (!b->irq_enabled++)
> + irq_enable(engine);
> + GEM_BUG_ON(!b->irq_enabled); /* no overflow! */
> + spin_unlock_irq(&b->irq_lock);
> +}
> +
> +void intel_engine_unpin_breadcrumbs_irq(struct intel_engine_cs *engine)
> +{
> + struct intel_breadcrumbs *b = &engine->breadcrumbs;
> +
> + spin_lock_irq(&b->irq_lock);
> + GEM_BUG_ON(!b->irq_enabled); /* no underflow! */
> + if (!--b->irq_enabled)
> + irq_disable(engine);
> + spin_unlock_irq(&b->irq_lock);
> +}
> +
> static bool __intel_breadcrumbs_arm_irq(struct intel_breadcrumbs *b)
> {
> struct intel_engine_cs *engine =
> diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h b/drivers/gpu/drm/i915/gt/intel_engine.h
> index 791897f8d847..043462b6ce1f 100644
> --- a/drivers/gpu/drm/i915/gt/intel_engine.h
> +++ b/drivers/gpu/drm/i915/gt/intel_engine.h
> @@ -226,6 +226,9 @@ void intel_engine_init_execlists(struct intel_engine_cs *engine);
> void intel_engine_init_breadcrumbs(struct intel_engine_cs *engine);
> void intel_engine_fini_breadcrumbs(struct intel_engine_cs *engine);
>
> +void intel_engine_pin_breadcrumbs_irq(struct intel_engine_cs *engine);
> +void intel_engine_unpin_breadcrumbs_irq(struct intel_engine_cs *engine);
> +
> void intel_engine_disarm_breadcrumbs(struct intel_engine_cs *engine);
>
> static inline void
> --
> 2.20.1
>
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