[PATCH v4] drm/i915: Make IRQ reset and postinstall multi-gt aware

[Andi Shyti]

In multi-gt systems IRQs need to be reset and enabled per GT.

This might add some redundancy when handling interrupts for
engines that might not exist in every tile, but helps to keep the
code cleaner and more understandable.

Signed-off-by: Andi Shyti <andi.shyti at linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
Hi,

The rsults of this patch are more than promising as we are able
to have MTL booting and executing basic tests.(*)

Thank you Daniele and Matt for the valuable exchange of opinions.

Amdo

(*) https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_115465v5/index.html?

Changelog
=========
v3 -> v4
 - do not change the initial gt and uncore initialization in
   order to gain a better understanding at a glance of the
   purpose of all the local variables.
v2 -> v3
 - keep GUnit irq initialization out of the for_each_gt() loop as
   the media GT doesn't have a GUnit.
v1 -> v2
 - improve description in the commit log.

 drivers/gpu/drm/i915/i915_irq.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index dea1a117f3fa1..c027fd5189b85 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2858,10 +2858,13 @@ 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);
+	for_each_gt(gt, dev_priv, i)
+		gen11_gt_irq_reset(gt);
+
 	gen11_display_irq_reset(dev_priv);
 
 	GEN3_IRQ_RESET(uncore, GEN11_GU_MISC_);
@@ -3646,8 +3649,10 @@ 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;
+	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);
 
-- 
2.39.2