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

drivers/gpu/drm/i915/TODO.txt

@@ -37,5 +37,5 @@ Smaller things:
 
   https://lore.kernel.org/linux-mm/20210301083320.943079-1-hch@lst.de/
 
-- tasklet helpers in i915_gem.h also look a bit misplaced and should
+- tasklet helpers in i915_tasklet.h also look a bit misplaced and should
   probably be moved to tasklet headers.

drivers/gpu/drm/i915/i915_gem.h

@@ -26,7 +26,6 @@
 #define __I915_GEM_H__
 
 #include <linux/bug.h>
-#include <linux/interrupt.h>
 
 #include <drm/drm_drv.h>
 
@@ -85,36 +84,4 @@ struct drm_i915_private;
 
 #define I915_GEM_IDLE_TIMEOUT (HZ / 5)
 
-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_GEM_H__ */

drivers/gpu/drm/i915/i915_scheduler.h

@@ -12,6 +12,7 @@
 #include <linux/kernel.h>
 
 #include "i915_scheduler_types.h"
+#include "i915_tasklet.h"
 
 struct drm_printer;
 

drivers/gpu/drm/i915/i915_tasklet.h

+/* 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__ */