[Intel-gfx] [PATCH] drm/i915: Make IRQ reset and postinstall multi-gt aware

[Matt Roper]

On Wed, Mar 22, 2023 at 12:20:09AM +0100, Andi Shyti wrote:
> From: Paulo Zanoni <paulo.r.zanoni at intel.com>
> 
> In multitile systems IRQ need to be reset and enabled per GT.

At the moment we're not enabling multi-tile support on any platforms
yet.  Xe_HP SDV has pretty much already served its purpose as an early
Xe_HP test platform, and most PVC effort is refocusing on the Xe KMD
right now.

Note that we don't want/need changes like this on non-tile multi-gt
platforms like MTL.  The interrupt registers you're accessing here are
sgunit registers so there's only ever a single copy of the register on
such platforms; looping around and processing the same register two
times in a row doesn't accomplish anything that just processing them a
single time doesn't.


Matt

> 
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
> Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> Signed-off-by: Andi Shyti <andi.shyti at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/i915_irq.c | 28 ++++++++++++++++++----------
>  1 file changed, 18 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 31271c30a8cf4..ee4530ec14de3 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -2762,14 +2762,19 @@ static void dg1_irq_reset(struct drm_i915_private *dev_priv)
>  {
>  	struct intel_gt *gt = to_gt(dev_priv);
>  	struct intel_uncore *uncore = gt->uncore;
> +	unsigned int i;
>  
>  	dg1_master_intr_disable(dev_priv->uncore.regs);
>  
> -	gen11_gt_irq_reset(gt);
> -	gen11_display_irq_reset(dev_priv);
> +	for_each_gt(gt, dev_priv, i) {
> +		gen11_gt_irq_reset(gt);
>  
> -	GEN3_IRQ_RESET(uncore, GEN11_GU_MISC_);
> -	GEN3_IRQ_RESET(uncore, GEN8_PCU_);
> +		uncore = gt->uncore;
> +		GEN3_IRQ_RESET(uncore, GEN11_GU_MISC_);
> +		GEN3_IRQ_RESET(uncore, GEN8_PCU_);
> +	}
> +
> +	gen11_display_irq_reset(dev_priv);
>  }
>  
>  void gen8_irq_power_well_post_enable(struct drm_i915_private *dev_priv,
> @@ -3423,13 +3428,16 @@ static void gen11_irq_postinstall(struct drm_i915_private *dev_priv)
>  
>  static void dg1_irq_postinstall(struct drm_i915_private *dev_priv)
>  {
> -	struct intel_gt *gt = to_gt(dev_priv);
> -	struct intel_uncore *uncore = gt->uncore;
>  	u32 gu_misc_masked = GEN11_GU_MISC_GSE;
> +	struct intel_gt *gt;
> +	unsigned int i;
>  
> -	gen11_gt_irq_postinstall(gt);
> +	for_each_gt(gt, dev_priv, i) {
> +		gen11_gt_irq_postinstall(gt);
>  
> -	GEN3_IRQ_INIT(uncore, GEN11_GU_MISC_, ~gu_misc_masked, gu_misc_masked);
> +		GEN3_IRQ_INIT(gt->uncore, GEN11_GU_MISC_, ~gu_misc_masked,
> +			      gu_misc_masked);
> +	}
>  
>  	if (HAS_DISPLAY(dev_priv)) {
>  		icp_irq_postinstall(dev_priv);
> @@ -3438,8 +3446,8 @@ static void dg1_irq_postinstall(struct drm_i915_private *dev_priv)
>  				   GEN11_DISPLAY_IRQ_ENABLE);
>  	}
>  
> -	dg1_master_intr_enable(uncore->regs);
> -	intel_uncore_posting_read(uncore, DG1_MSTR_TILE_INTR);
> +	dg1_master_intr_enable(to_gt(dev_priv)->uncore->regs);
> +	intel_uncore_posting_read(to_gt(dev_priv)->uncore, DG1_MSTR_TILE_INTR);
>  }
>  
>  static void cherryview_irq_postinstall(struct drm_i915_private *dev_priv)
> -- 
> 2.39.2
> 

-- 
Matt Roper
Graphics Software Engineer
Linux GPU Platform Enablement
Intel Corporation