[PATCH v2] drm/i915: Make IRQ reset and postinstall multi-gt aware

[Zanoni, Paulo R]

On Thu, 2023-04-13 at 11:20 +0200, Andi Shyti wrote:
> From: Paulo Zanoni <paulo.r.zanoni at intel.com>
Hi

https://en.wikipedia.org/wiki/Ship_of_Theseus

My original patch was written in 2018. Since then, the implementation
has been rebased and changed multiple times, the commit message has
been changed, the subject line has been changed, yet none of that is
documented in the patch's revision history: it was all removed and it
now looks like I'm the author of the version that was submitted this
month. I never liked this "erase the internal patch's changelog before
submitting it upstream for the first time" process, I think it erases
crucial information and misleads people.

I know I said something different earlier in private, but after further
reflection, I concluded I do not feel comfortable having my name as the
Author or as the Signed-off-by in this patch. Please remove it. You can
add a "Based-on-patch-by: Paulo Zanoni <paulo.r.zanoni at intel.com>" if
you want, but that's not necessary.

This should also help in case some bug is bisected to this patch, then
I won't need to spend time researching who I should forward the emails
to.

Thanks,
Paulo

> 
> In multitile systems IRQ need to be reset and enabled per GT.
> 
> Although in MTL the GUnit misc interrupts register set are
> available only in GT-0, we need to loop through all the GT's
> in order to initialize the media engine which lies on a different
> GT.
> 
> 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>
> ---
> Hi,
> 
> proposing again this patch, apparently GuC needs this patch to
> initialize the media GT.
> 
> Andi
> 
> Changelog
> =========
> v1 -> v2
>  - improve description in the commit log.
> 
>  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 d24bdea65a3dc..524d64bf5d186 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -2764,14 +2764,19 @@ 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,
> @@ -3425,13 +3430,16 @@ 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);
> @@ -3440,8 +3448,8 @@ 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)