edge-microvisor-toolkit/SPECS/kernel-rt/0075-drm-xe-gsc-mei-interrupt-top-half-should-be-in-irq-d.patch at f61b366735e10dd24eaddae40facafbdade39748 · open-edge-platform/edge-microvisor-toolkit · GitHub

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From 28f4a8fd24ecc9f0d4a956fcdcec3126952e0326 Mon Sep 17 00:00:00 2001
From: Junxiao Chang <junxiao.chang@intel.com>
Date: Wed, 2 Jul 2025 08:53:30 +0800
Subject: [PATCH 75/76] drm/xe/gsc: mei interrupt top half should be in irq
 disabled context

MEI GSC interrupt comes from xe. It has top half and bottom half.
Top half is called from xe interrupt handler. It should be in irq
disabled context.

With RT kernel, by default xe IRQ handler is in threaded IRQ. MEI GSC
top half might be in threaded IRQ context. generic_handle_irq_safe API
could be called from either IRQ or process context, it disables local
IRQ then calls MEI GSC interrupt top half.

This change fixes B580 GPU boot hang issue with RT kernel.

Signed-off-by: Junxiao Chang <junxiao.chang@intel.com>
---
 drivers/gpu/drm/xe/xe_heci_gsc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_heci_gsc.c b/drivers/gpu/drm/xe/xe_heci_gsc.c
index 65b2e147c4b92..894a6bd332853 100644
--- a/drivers/gpu/drm/xe/xe_heci_gsc.c
+++ b/drivers/gpu/drm/xe/xe_heci_gsc.c
@@ -230,7 +230,7 @@ void xe_heci_gsc_irq_handler(struct xe_device *xe, u32 iir)
 	if (xe->heci_gsc.irq < 0)
 		return;

-	ret = generic_handle_irq(xe->heci_gsc.irq);
+	ret = generic_handle_irq_safe(xe->heci_gsc.irq);
 	if (ret)
 		drm_err_ratelimited(&xe->drm, "error handling GSC irq: %d\n", ret);
 }
@@ -250,7 +250,7 @@ void xe_heci_csc_irq_handler(struct xe_device *xe, u32 iir)
 	if (xe->heci_gsc.irq < 0)
 		return;

-	ret = generic_handle_irq(xe->heci_gsc.irq);
+	ret = generic_handle_irq_safe(xe->heci_gsc.irq);
 	if (ret)
 		drm_err_ratelimited(&xe->drm, "error handling GSC irq: %d\n", ret);
 }
--
2.43.0