For conveniences of callers that just want to use an i915_active to
track a wide array of concurrent timelines, wrap the base i915_active
struct inside a kref. This i915_active will self-destruct after use.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_active.c | 52 ++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/i915_active.h | 4 +++
2 files changed, 56 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_active.c b/drivers/gpu/drm/i915/i915_active.c
index 7b3d6c12ad61..5d03a841fd5c 100644
--- a/drivers/gpu/drm/i915/i915_active.c
+++ b/drivers/gpu/drm/i915/i915_active.c
@@ -881,6 +881,58 @@ void i915_active_noop(struct dma_fence *fence, struct dma_fence_cb *cb)
active_fence_cb(fence, cb);
}
+struct auto_active {
+ struct i915_active base;
+ struct kref ref;
+};
+
+struct i915_active *i915_active_get(struct i915_active *ref)
+{
+ struct auto_active *aa = container_of(ref, typeof(*aa), base);
+
+ kref_get(&aa->ref);
+ return &aa->base;
+}
+
+static void auto_release(struct kref *ref)
+{
+ struct auto_active *aa = container_of(ref, typeof(*aa), ref);
+
+ i915_active_fini(&aa->base);
+ kfree(aa);
+}
+
+void i915_active_put(struct i915_active *ref)
+{
+ struct auto_active *aa = container_of(ref, typeof(*aa), base);
+ kref_put(&aa->ref, auto_release);
+}
+
+static int auto_active(struct i915_active *ref)
+{
+ i915_active_get(ref);
+ return 0;
+}
+
+static void auto_retire(struct i915_active *ref)
+{
+ i915_active_put(ref);
+}
+
+struct i915_active *i915_active_create(void)
+{
+ struct auto_active *aa;
+
+ aa = kmalloc(sizeof(*aa), GFP_KERNEL);
+ if (!aa)
+ return NULL;
+
+ kref_init(&aa->ref);
+ i915_active_init(&aa->base, auto_active, auto_retire);
+
+ return &aa->base;
+}
+
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
#include "selftests/i915_active.c"
#endif
diff --git a/drivers/gpu/drm/i915/i915_active.h b/drivers/gpu/drm/i915/i915_active.h
index 973ff0447c6c..7e438501333e 100644
--- a/drivers/gpu/drm/i915/i915_active.h
+++ b/drivers/gpu/drm/i915/i915_active.h
@@ -215,4 +215,8 @@ void i915_request_add_active_barriers(struct i915_request *rq);
void i915_active_print(struct i915_active *ref, struct drm_printer *m);
void i915_active_unlock_wait(struct i915_active *ref);
+struct i915_active *i915_active_create(void);
+struct i915_active *i915_active_get(struct i915_active *ref);
+void i915_active_put(struct i915_active *ref);
+
#endif /* _I915_ACTIVE_H_ */
--
2.25.1
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