[Intel-gfx] [PATCH] drm/i915/tgl: Disable preemption while being debugged

[Chris Wilson]

We see failures where the context continues executing past a
preemption event, eventually leading to situations where a request has
executed before we have event submitted it to HW! It seems like tgl is
ignoring our RING_TAIL updates, but more likely is that there is a
missing update required for our semaphore waits around preemption.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_pci.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
index b3cc8560696b..2ca34a5cf7d3 100644
--- a/drivers/gpu/drm/i915/i915_pci.c
+++ b/drivers/gpu/drm/i915/i915_pci.c
@@ -798,6 +798,7 @@ static const struct intel_device_info intel_tigerlake_12_info = {
 	.engine_mask =
 		BIT(RCS0) | BIT(BCS0) | BIT(VECS0) | BIT(VCS0) | BIT(VCS2),
 	.has_rc6 = false, /* XXX disabled for debugging */
+	.has_logical_ring_preemption = false, /* XXX disabled for debugging */
 };
 
 #undef GEN
-- 
2.23.0