drm/i915/tgl: Disable preemption while being debugged

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.

v2: And disable internal semaphore usage

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Acked-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190912132313.12751-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 47d766c..a3f0e49 100644 (file)
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -2939,6 +2939,9 @@ void intel_execlists_set_default_submission(struct intel_engine_cs *engine)
                        engine->flags |= I915_ENGINE_HAS_PREEMPTION;
        }
 
+       if (INTEL_GEN(engine->i915) >= 12) /* XXX disabled for debugging */
+               engine->flags &= ~I915_ENGINE_HAS_SEMAPHORES;
+
        if (engine->class != COPY_ENGINE_CLASS && INTEL_GEN(engine->i915) >= 12)
                engine->flags |= I915_ENGINE_HAS_RELATIVE_MMIO;
 }

diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
index 6981162..9236fcc 100644 (file)
--- 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