[PATCH] drm/i915: Encode fence specific waitqueue behaviour into the wait.flags

[Chris Wilson]

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_sw_fence.c | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_sw_fence.c b/drivers/gpu/drm/i915/i915_sw_fence.c
index 4cd2038cbe35..fc17a2a8c0d8 100644
--- a/drivers/gpu/drm/i915/i915_sw_fence.c
+++ b/drivers/gpu/drm/i915/i915_sw_fence.c
@@ -18,10 +18,13 @@
 #define I915_SW_FENCE_BUG_ON(expr) BUILD_BUG_ON_INVALID(expr)
 #endif
 
-#define I915_SW_FENCE_FLAG_ALLOC BIT(3) /* after WQ_FLAG_* for safety */
 
 static DEFINE_SPINLOCK(i915_sw_fence_lock);
 
+/* after WQ_FLAG_* for safety */
+#define I915_SW_FENCE_FLAG_FENCE BIT(BITS_PER_LONG - 1)
+#define I915_SW_FENCE_FLAG_ALLOC BIT(BITS_PER_LONG - 2)
+
 enum {
 	DEBUG_FENCE_IDLE = 0,
 	DEBUG_FENCE_NOTIFY,
@@ -154,10 +157,10 @@ static void __i915_sw_fence_wake_up_all(struct i915_sw_fence *fence,
 	spin_lock_irqsave_nested(&x->lock, flags, 1 + !!continuation);
 	if (continuation) {
 		list_for_each_entry_safe(pos, next, &x->head, entry) {
-			if (pos->func == autoremove_wake_function)
-				pos->func(pos, TASK_NORMAL, 0, continuation);
-			else
+			if (pos->flags & I915_SW_FENCE_FLAG_FENCE)
 				list_move_tail(&pos->entry, continuation);
+			else
+				pos->func(pos, TASK_NORMAL, 0, continuation);
 		}
 	} else {
 		LIST_HEAD(extra);
@@ -166,9 +169,9 @@ static void __i915_sw_fence_wake_up_all(struct i915_sw_fence *fence,
 			list_for_each_entry_safe(pos, next, &x->head, entry) {
 				int wake_flags;
 
-				wake_flags = fence->error;
-				if (pos->func == autoremove_wake_function)
-					wake_flags = 0;
+				wake_flags = 0;
+				if (pos->flags & I915_SW_FENCE_FLAG_FENCE)
+					wake_flags = fence->error;
 
 				pos->func(pos, TASK_NORMAL, wake_flags, &extra);
 			}
@@ -332,8 +335,8 @@ static int __i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence,
 					  struct i915_sw_fence *signaler,
 					  wait_queue_entry_t *wq, gfp_t gfp)
 {
+	unsigned long pending;
 	unsigned long flags;
-	int pending;
 
 	debug_fence_assert(fence);
 	might_sleep_if(gfpflags_allow_blocking(gfp));
@@ -349,7 +352,7 @@ static int __i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence,
 	if (unlikely(i915_sw_fence_check_if_after(fence, signaler)))
 		return -EINVAL;
 
-	pending = 0;
+	pending = I915_SW_FENCE_FLAG_FENCE;
 	if (!wq) {
 		wq = kmalloc(sizeof(*wq), gfp);
 		if (!wq) {
-- 
2.20.1