diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2019-12-02 17:01:32 +0300 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2019-12-03 00:57:23 +0300 |
| commit | ae30300490fe9790857d3780f46aa5ad926d6261 (patch) | |
| tree | 659db03954fbefc380e2fd759d06d1c44af5d098 /drivers/gpu/drm/i915/i915_active.h | |
| parent | 7d0aa0db4375edb0a2de66e9099fe0f9b197b80d (diff) | |
| download | linux-ae30300490fe9790857d3780f46aa5ad926d6261.tar.xz | |
drm/i915: Specialise i915_active.work lock classes
Similar to for i915_active.mutex, we require each class of i915_active
to have distinct lockdep chains as some, but by no means all,
i915_active are used within the shrinker and so have much more severe
usage constraints. By using a lockclass local to i915_active_init() all
i915_active workers have the same lock class, and we may generate false
positives when waiting for the i915_active. If we push the lockclass
into the caller, each class of i915_active will have distinct lockdep
chains.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191202140133.2444217-1-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/i915_active.h')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_active.h | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/gpu/drm/i915/i915_active.h b/drivers/gpu/drm/i915/i915_active.h index 3208cc2e8c1a..b571f675c795 100644 --- a/drivers/gpu/drm/i915/i915_active.h +++ b/drivers/gpu/drm/i915/i915_active.h @@ -152,11 +152,15 @@ i915_active_fence_isset(const struct i915_active_fence *active) void __i915_active_init(struct i915_active *ref, int (*active)(struct i915_active *ref), void (*retire)(struct i915_active *ref), - struct lock_class_key *key); + struct lock_class_key *mkey, + struct lock_class_key *wkey); + +/* Specialise each class of i915_active to avoid impossible lockdep cycles. */ #define i915_active_init(ref, active, retire) do { \ - static struct lock_class_key __key; \ + static struct lock_class_key __mkey; \ + static struct lock_class_key __wkey; \ \ - __i915_active_init(ref, active, retire, &__key); \ + __i915_active_init(ref, active, retire, &__mkey, &__wkey); \ } while (0) int i915_active_ref(struct i915_active *ref, |