drm/i915/tasklet: separate local hacks around struct tasklet_struct

Add a dedicated file for the local functions around struct
tasklet_struct. Far from ideal, but better placed in a dedicated file
than i915_gem.h.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220607094207.536699-1-jani.nikula@intel.com

1 files changed, 43 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_tasklet.h b/drivers/gpu/drm/i915/i915_tasklet.h
new file mode 100644
index 000000000000..5d7069bdf2c0
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_tasklet.h
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#ifndef __I915_TASKLET_H__
+#define __I915_TASKLET_H__
+
+#include <linux/interrupt.h>
+
+static inline void tasklet_lock(struct tasklet_struct *t)
+{
+	while (!tasklet_trylock(t))
+		cpu_relax();
+}
+
+static inline bool tasklet_is_locked(const struct tasklet_struct *t)
+{
+	return test_bit(TASKLET_STATE_RUN, &t->state);
+}
+
+static inline void __tasklet_disable_sync_once(struct tasklet_struct *t)
+{
+	if (!atomic_fetch_inc(&t->count))
+		tasklet_unlock_spin_wait(t);
+}
+
+static inline bool __tasklet_is_enabled(const struct tasklet_struct *t)
+{
+	return !atomic_read(&t->count);
+}
+
+static inline bool __tasklet_enable(struct tasklet_struct *t)
+{
+	return atomic_dec_and_test(&t->count);
+}
+
+static inline bool __tasklet_is_scheduled(struct tasklet_struct *t)
+{
+	return test_bit(TASKLET_STATE_SCHED, &t->state);
+}
+
+#endif /* __I915_TASKLET_H__ */