Re: [PATCH v2] drm/i915: Reset the breadcrumbs IRQ more carefully

[Mika Kuoppala <mika.kuoppala@linux.intel.com>]

Chris Wilson <chris@chris-wilson.co.uk> writes:

> Along with the interrupt, we want to restore the fake-irq and
> wait-timeout detection. If we use the breadcrumbs interface to setup the
> interrupt as it wants, the auxiliary timers will also be restored.
>
> v2: Cancel both timers as well, sanitize the IMR.
>
> Fixes: 821ed7df6e2a ("drm/i915: Update reset path to fix incomplete requests")
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Mika Kuoppala <mika.kuoppala@intel.com>

Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>

> ---
>  drivers/gpu/drm/i915/intel_breadcrumbs.c | 31 +++++++++++++++++++++++++++++--
>  drivers/gpu/drm/i915/intel_engine_cs.c   | 15 ---------------
>  drivers/gpu/drm/i915/intel_lrc.c         |  2 +-
>  drivers/gpu/drm/i915/intel_ringbuffer.c  |  2 +-
>  drivers/gpu/drm/i915/intel_ringbuffer.h  |  2 +-
>  5 files changed, 32 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_breadcrumbs.c b/drivers/gpu/drm/i915/intel_breadcrumbs.c
> index 9bad14d22c95..3dd23c16bea1 100644
> --- a/drivers/gpu/drm/i915/intel_breadcrumbs.c
> +++ b/drivers/gpu/drm/i915/intel_breadcrumbs.c
> @@ -578,6 +578,34 @@ int intel_engine_init_breadcrumbs(struct intel_engine_cs *engine)
>  	return 0;
>  }
>  
> +static void cancel_fake_irq(struct intel_engine_cs *engine)
> +{
> +	struct intel_breadcrumbs *b = &engine->breadcrumbs;
> +
> +	del_timer_sync(&b->hangcheck);
> +	del_timer_sync(&b->fake_irq);
> +	clear_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings);
> +}
> +
> +void intel_engine_reset_breadcrumbs(struct intel_engine_cs *engine)
> +{
> +	struct intel_breadcrumbs *b = &engine->breadcrumbs;
> +
> +	cancel_fake_irq(engine);
> +	spin_lock(&b->lock);
> +
> +	__intel_breadcrumbs_disable_irq(b);
> +	if (intel_engine_has_waiter(engine)) {
> +		b->timeout = wait_timeout();
> +		__intel_breadcrumbs_enable_irq(b);
> +	} else {
> +		/* sanitize the IMR and unmask any auxiliary interrupts */
> +		irq_disable(engine);
> +	}
> +
> +	spin_unlock(&b->lock);
> +}
> +
>  void intel_engine_fini_breadcrumbs(struct intel_engine_cs *engine)
>  {
>  	struct intel_breadcrumbs *b = &engine->breadcrumbs;
> @@ -585,8 +613,7 @@ void intel_engine_fini_breadcrumbs(struct intel_engine_cs *engine)
>  	if (!IS_ERR_OR_NULL(b->signaler))
>  		kthread_stop(b->signaler);
>  
> -	del_timer_sync(&b->hangcheck);
> -	del_timer_sync(&b->fake_irq);
> +	cancel_fake_irq(engine);
>  }
>  
>  unsigned int intel_kick_waiters(struct drm_i915_private *i915)
> diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
> index d00ec805f93d..480584c09306 100644
> --- a/drivers/gpu/drm/i915/intel_engine_cs.c
> +++ b/drivers/gpu/drm/i915/intel_engine_cs.c
> @@ -210,9 +210,6 @@ void intel_engine_init_seqno(struct intel_engine_cs *engine, u32 seqno)
>  void intel_engine_init_hangcheck(struct intel_engine_cs *engine)
>  {
>  	memset(&engine->hangcheck, 0, sizeof(engine->hangcheck));
> -	clear_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings);
> -	if (intel_engine_has_waiter(engine))
> -		i915_queue_hangcheck(engine->i915);
>  }
>  
>  static void intel_engine_init_requests(struct intel_engine_cs *engine)
> @@ -307,18 +304,6 @@ int intel_engine_init_common(struct intel_engine_cs *engine)
>  	return 0;
>  }
>  
> -void intel_engine_reset_irq(struct intel_engine_cs *engine)
> -{
> -	struct drm_i915_private *dev_priv = engine->i915;
> -
> -	spin_lock_irq(&dev_priv->irq_lock);
> -	if (intel_engine_has_waiter(engine))
> -		engine->irq_enable(engine);
> -	else
> -		engine->irq_disable(engine);
> -	spin_unlock_irq(&dev_priv->irq_lock);
> -}
> -
>  /**
>   * intel_engines_cleanup_common - cleans up the engine state created by
>   *                                the common initiailizers.
> diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
> index 936f6f63f626..44904e298bfc 100644
> --- a/drivers/gpu/drm/i915/intel_lrc.c
> +++ b/drivers/gpu/drm/i915/intel_lrc.c
> @@ -1230,7 +1230,7 @@ static int gen8_init_common_ring(struct intel_engine_cs *engine)
>  
>  	lrc_init_hws(engine);
>  
> -	intel_engine_reset_irq(engine);
> +	intel_engine_reset_breadcrumbs(engine);
>  
>  	I915_WRITE(RING_HWSTAM(engine->mmio_base), 0xffffffff);
>  
> diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
> index 35f359e38f4d..729f373782e2 100644
> --- a/drivers/gpu/drm/i915/intel_ringbuffer.c
> +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
> @@ -548,7 +548,7 @@ static int init_ring_common(struct intel_engine_cs *engine)
>  	else
>  		intel_ring_setup_status_page(engine);
>  
> -	intel_engine_reset_irq(engine);
> +	intel_engine_reset_breadcrumbs(engine);
>  
>  	/* Enforce ordering by reading HEAD register back */
>  	I915_READ_HEAD(engine);
> diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
> index 34954ca03a4a..124f4646958d 100644
> --- a/drivers/gpu/drm/i915/intel_ringbuffer.h
> +++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
> @@ -520,7 +520,6 @@ int __intel_ring_space(int head, int tail, int size);
>  void intel_ring_update_space(struct intel_ring *ring);
>  
>  void intel_engine_init_seqno(struct intel_engine_cs *engine, u32 seqno);
> -void intel_engine_reset_irq(struct intel_engine_cs *engine);
>  
>  void intel_engine_setup_common(struct intel_engine_cs *engine);
>  int intel_engine_init_common(struct intel_engine_cs *engine);
> @@ -614,6 +613,7 @@ static inline bool intel_engine_wakeup(const struct intel_engine_cs *engine)
>  	return wakeup;
>  }
>  
> +void intel_engine_reset_breadcrumbs(struct intel_engine_cs *engine);
>  void intel_engine_fini_breadcrumbs(struct intel_engine_cs *engine);
>  unsigned int intel_kick_waiters(struct drm_i915_private *i915);
>  unsigned int intel_kick_signalers(struct drm_i915_private *i915);
> -- 
> 2.9.3
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