[3/5] drm/i915/gt: add a macro for mock gt wakeref special value and use it

Commit Message

Jani Nikula Sept. 18, 2024, 11:17 a.m. UTC

Add a dedicated macro for the special mock gt wakeref value, with a cast
to intel_wakeref_t, instead of assuming you can assign or compare the
wakeref to -ENODEV directly.

Arguably the whole thing is a hack that should not exist, but at least
make it slightly less hacky.

Side note: If this value were to ever end up in
intel_ref_tracker_free(), it would wreak havoc.

Signed-off-by: Jani Nikula <[e-mail]>
---
 drivers/gpu/drm/i915/gt/intel_gt_pm.h            | 6 +++++-
 drivers/gpu/drm/i915/gt/intel_tlb.c              | 2 +-
 drivers/gpu/drm/i915/selftests/mock_gem_device.c | 2 +-
 3 files changed, 7 insertions(+), 3 deletions(-)

Patch

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.h b/drivers/gpu/drm/i915/gt/intel_gt_pm.h
index 911fd0160221..fef8d5d288f8 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_pm.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.h
@@ -105,9 +105,13 @@  int intel_gt_runtime_resume(struct intel_gt *gt);
 
 ktime_t intel_gt_get_awake_time(const struct intel_gt *gt);
 
+#define INTEL_WAKEREF_MOCK_GT ((intel_wakeref_t)-ENODEV)
+
 static inline bool is_mock_gt(const struct intel_gt *gt)
 {
-	return I915_SELFTEST_ONLY(gt->awake == -ENODEV);
+	BUILD_BUG_ON(INTEL_WAKEREF_DEF == INTEL_WAKEREF_MOCK_GT);
+
+	return I915_SELFTEST_ONLY(gt->awake == INTEL_WAKEREF_MOCK_GT);
 }
 
 #endif /* INTEL_GT_PM_H */
diff --git a/drivers/gpu/drm/i915/gt/intel_tlb.c b/drivers/gpu/drm/i915/gt/intel_tlb.c
index 756e9ebbc725..2487768bc230 100644
--- a/drivers/gpu/drm/i915/gt/intel_tlb.c
+++ b/drivers/gpu/drm/i915/gt/intel_tlb.c
@@ -122,7 +122,7 @@  void intel_gt_invalidate_tlb_full(struct intel_gt *gt, u32 seqno)
 {
 	intel_wakeref_t wakeref;
 
-	if (I915_SELFTEST_ONLY(gt->awake == -ENODEV))
+	if (is_mock_gt(gt))
 		return;
 
 	if (intel_gt_is_wedged(gt))
diff --git a/drivers/gpu/drm/i915/selftests/mock_gem_device.c b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
index 70f3d7bf47d0..ae57eb03dfca 100644
--- a/drivers/gpu/drm/i915/selftests/mock_gem_device.c
+++ b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
@@ -203,7 +203,7 @@  struct drm_i915_private *mock_gem_device(void)
 	intel_root_gt_init_early(i915);
 	mock_uncore_init(&i915->uncore, i915);
 	atomic_inc(&to_gt(i915)->wakeref.count); /* disable; no hw support */
-	to_gt(i915)->awake = -ENODEV;
+	to_gt(i915)->awake = INTEL_WAKEREF_MOCK_GT;
 	mock_gt_probe(i915);
 
 	ret = intel_region_ttm_device_init(i915);