[PATCH v1 1/1] drm/i915/pxp: Add drm_dbgs for critical PXP events.

[Jani Nikula]

On Wed, 06 Sep 2023, Alan Previn <alan.previn.teres.alexis at intel.com> wrote:
> Debugging PXP issues can't even begin without understanding precedding
> sequence of events. Add drm_dbg into the most important PXP events.
>
> Signed-off-by: Alan Previn <alan.previn.teres.alexis at intel.com>
> ---
>  drivers/gpu/drm/i915/gt/uc/intel_gsc_proxy.c |  2 ++
>  drivers/gpu/drm/i915/pxp/intel_pxp.c         | 10 ++++++++--
>  drivers/gpu/drm/i915/pxp/intel_pxp_irq.c     |  4 ++--
>  drivers/gpu/drm/i915/pxp/intel_pxp_session.c |  6 +++++-
>  drivers/gpu/drm/i915/pxp/intel_pxp_types.h   |  1 +
>  5 files changed, 18 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_gsc_proxy.c b/drivers/gpu/drm/i915/gt/uc/intel_gsc_proxy.c
> index 5f138de3c14f..61216c4abaec 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_gsc_proxy.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_gsc_proxy.c
> @@ -321,6 +321,7 @@ static int i915_gsc_proxy_component_bind(struct device *i915_kdev,
>  	mutex_lock(&gsc->proxy.mutex);
>  	gsc->proxy.component = data;
>  	gsc->proxy.component->mei_dev = mei_kdev;
> +	gt_dbg(gt, "GSC proxy mei component bound\n");
>  	mutex_unlock(&gsc->proxy.mutex);
>  
>  	return 0;
> @@ -342,6 +343,7 @@ static void i915_gsc_proxy_component_unbind(struct device *i915_kdev,
>  	with_intel_runtime_pm(&i915->runtime_pm, wakeref)
>  		intel_uncore_rmw(gt->uncore, HECI_H_CSR(MTL_GSC_HECI2_BASE),
>  				 HECI_H_CSR_IE | HECI_H_CSR_RST, 0);
> +	gt_dbg(gt, "GSC proxy mei component unbound\n");
>  }
>  
>  static const struct component_ops i915_gsc_proxy_component_ops = {
> diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.c b/drivers/gpu/drm/i915/pxp/intel_pxp.c
> index dc327cf40b5a..d285f10bbacc 100644
> --- a/drivers/gpu/drm/i915/pxp/intel_pxp.c
> +++ b/drivers/gpu/drm/i915/pxp/intel_pxp.c
> @@ -303,6 +303,8 @@ static int __pxp_global_teardown_final(struct intel_pxp *pxp)
>  
>  	if (!pxp->arb_is_valid)
>  		return 0;
> +
> +	drm_dbg(&pxp->ctrl_gt->i915->drm, "PXP: %s invoked", __func__);

drm_dbg already covers __func__ (via __builtin_return_address(0) in
__drm_dev_dbg), it's redundant.

Ditto for all added debugs below.

BR,
Jani.

>  	/*
>  	 * To ensure synchronous and coherent session teardown completion
>  	 * in response to suspend or shutdown triggers, don't use a worker.
> @@ -324,6 +326,8 @@ static int __pxp_global_teardown_restart(struct intel_pxp *pxp)
>  
>  	if (pxp->arb_is_valid)
>  		return 0;
> +
> +	drm_dbg(&pxp->ctrl_gt->i915->drm, "PXP: %s invoked", __func__);
>  	/*
>  	 * The arb-session is currently inactive and we are doing a reset and restart
>  	 * due to a runtime event. Use the worker that was designed for this.
> @@ -414,10 +418,12 @@ int intel_pxp_start(struct intel_pxp *pxp)
>  	int ret = 0;
>  
>  	ret = intel_pxp_get_readiness_status(pxp, PXP_READINESS_TIMEOUT);
> -	if (ret < 0)
> +	if (ret < 0) {
> +		drm_dbg(&pxp->ctrl_gt->i915->drm, "PXP: explicit %s failed on readiness with %d", __func__, ret);
>  		return ret;
> -	else if (ret > 1)
> +	} else if (ret > 1) {
>  		return -EIO; /* per UAPI spec, user may retry later */
> +	}
>  
>  	mutex_lock(&pxp->arb_mutex);
>  
> diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_irq.c b/drivers/gpu/drm/i915/pxp/intel_pxp_irq.c
> index 91e9622c07d0..0637b1d36356 100644
> --- a/drivers/gpu/drm/i915/pxp/intel_pxp_irq.c
> +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_irq.c
> @@ -40,11 +40,11 @@ void intel_pxp_irq_handler(struct intel_pxp *pxp, u16 iir)
>  		   GEN12_DISPLAY_APP_TERMINATED_PER_FW_REQ_INTERRUPT)) {
>  		/* immediately mark PXP as inactive on termination */
>  		intel_pxp_mark_termination_in_progress(pxp);
> -		pxp->session_events |= PXP_TERMINATION_REQUEST | PXP_INVAL_REQUIRED;
> +		pxp->session_events |= PXP_TERMINATION_REQUEST | PXP_INVAL_REQUIRED | PXP_EVENT_TYPE_IRQ;
>  	}
>  
>  	if (iir & GEN12_DISPLAY_STATE_RESET_COMPLETE_INTERRUPT)
> -		pxp->session_events |= PXP_TERMINATION_COMPLETE;
> +		pxp->session_events |= PXP_TERMINATION_COMPLETE | PXP_EVENT_TYPE_IRQ;
>  
>  	if (pxp->session_events)
>  		queue_work(system_unbound_wq, &pxp->session_work);
> diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_session.c b/drivers/gpu/drm/i915/pxp/intel_pxp_session.c
> index 0a3e66b0265e..2041dd5221e7 100644
> --- a/drivers/gpu/drm/i915/pxp/intel_pxp_session.c
> +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_session.c
> @@ -137,8 +137,10 @@ void intel_pxp_terminate(struct intel_pxp *pxp, bool post_invalidation_needs_res
>  static void pxp_terminate_complete(struct intel_pxp *pxp)
>  {
>  	/* Re-create the arb session after teardown handle complete */
> -	if (fetch_and_zero(&pxp->hw_state_invalidated))
> +	if (fetch_and_zero(&pxp->hw_state_invalidated)) {
> +		drm_dbg(&pxp->ctrl_gt->i915->drm, "PXP: %s to create arb_session after invalidation", __func__);
>  		pxp_create_arb_session(pxp);
> +	}
>  
>  	complete_all(&pxp->termination);
>  }
> @@ -157,6 +159,8 @@ static void pxp_session_work(struct work_struct *work)
>  	if (!events)
>  		return;
>  
> +	drm_dbg(&gt->i915->drm, "PXP: %s invoked with event-flags 0x%08x", __func__, events);
> +
>  	if (events & PXP_INVAL_REQUIRED)
>  		intel_pxp_invalidate(pxp);
>  
> diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_types.h b/drivers/gpu/drm/i915/pxp/intel_pxp_types.h
> index 7e11fa8034b2..07864b584cf4 100644
> --- a/drivers/gpu/drm/i915/pxp/intel_pxp_types.h
> +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_types.h
> @@ -124,6 +124,7 @@ struct intel_pxp {
>  #define PXP_TERMINATION_REQUEST  BIT(0)
>  #define PXP_TERMINATION_COMPLETE BIT(1)
>  #define PXP_INVAL_REQUIRED       BIT(2)
> +#define PXP_EVENT_TYPE_IRQ       BIT(3)
>  };
>  
>  #endif /* __INTEL_PXP_TYPES_H__ */
>
> base-commit: 5008076127a9599704e98fb4de3761743d943dd0

-- 
Jani Nikula, Intel Open Source Graphics Center