dma-fence: Change signature of __dma_fence_is_later

With the goal of reducing the need for drivers to touch (and dereference)
fence->ops, we change the prototype of __dma_fence_is_later() to take
fence instead of fence->ops.

Signed-off-by: Tvrtko Ursulin <[e-mail]>
Reviewed-by: Christian König <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Christian König <[e-mail]>

drivers/dma-buf/dma-fence-chain.c

···
 	chain->prev_seqno = 0;
 
 	/* Try to reuse the context of the previous chain node. */
-	if (prev_chain && __dma_fence_is_later(seqno, prev->seqno, prev->ops)) {
+	if (prev_chain && __dma_fence_is_later(prev, seqno, prev->seqno)) {
 		context = prev->context;
 		chain->prev_seqno = prev->seqno;
 	} else {

drivers/dma-buf/sw_sync.c

···
 {
 	struct sync_timeline *parent = dma_fence_parent(fence);
 
-	return !__dma_fence_is_later(fence->seqno, parent->value, fence->ops);
+	return !__dma_fence_is_later(fence, fence->seqno, parent->value);
 }
 
 static void timeline_fence_set_deadline(struct dma_fence *fence, ktime_t deadline)

drivers/gpu/drm/xe/xe_hw_fence.c

···
 	u32 seqno = xe_map_rd(xe, &fence->seqno_map, 0, u32);
 
 	return dma_fence->error ||
-		!__dma_fence_is_later(dma_fence->seqno, seqno, dma_fence->ops);
+		!__dma_fence_is_later(dma_fence, dma_fence->seqno, seqno);
 }
 
 static bool xe_hw_fence_enable_signaling(struct dma_fence *dma_fence)

drivers/gpu/drm/xe/xe_sched_job.c

···
 
 bool xe_sched_job_started(struct xe_sched_job *job)
 {
+	struct dma_fence *fence = dma_fence_chain_contained(job->fence);
 	struct xe_lrc *lrc = job->q->lrc[0];
 
-	return !__dma_fence_is_later(xe_sched_job_lrc_seqno(job),
-				     xe_lrc_start_seqno(lrc),
-				     dma_fence_chain_contained(job->fence)->ops);
+	return !__dma_fence_is_later(fence,
+				     xe_sched_job_lrc_seqno(job),
+				     xe_lrc_start_seqno(lrc));
 }
 
 bool xe_sched_job_completed(struct xe_sched_job *job)
 {
+	struct dma_fence *fence = dma_fence_chain_contained(job->fence);
 	struct xe_lrc *lrc = job->q->lrc[0];
 
 	/*
···
 	 * parallel handshake is done.
 	 */
 
-	return !__dma_fence_is_later(xe_sched_job_lrc_seqno(job),
-				     xe_lrc_seqno(lrc),
-				     dma_fence_chain_contained(job->fence)->ops);
+	return !__dma_fence_is_later(fence,
+				     xe_sched_job_lrc_seqno(job),
+				     xe_lrc_seqno(lrc));
 }
 
 void xe_sched_job_arm(struct xe_sched_job *job)

include/linux/dma-fence.h

···
 
 /**
  * __dma_fence_is_later - return if f1 is chronologically later than f2
+ * @fence: fence in whose context to do the comparison
  * @f1: the first fence's seqno
  * @f2: the second fence's seqno from the same context
- * @ops: dma_fence_ops associated with the seqno
  *
  * Returns true if f1 is chronologically later than f2. Both fences must be
  * from the same context, since a seqno is not common across contexts.
  */
-static inline bool __dma_fence_is_later(u64 f1, u64 f2,
-					const struct dma_fence_ops *ops)
+static inline bool __dma_fence_is_later(struct dma_fence *fence, u64 f1, u64 f2)
 {
 	/* This is for backward compatibility with drivers which can only handle
 	 * 32bit sequence numbers. Use a 64bit compare when the driver says to
 	 * do so.
 	 */
-	if (ops->use_64bit_seqno)
+	if (fence->ops->use_64bit_seqno)
 		return f1 > f2;
 
 	return (int)(lower_32_bits(f1) - lower_32_bits(f2)) > 0;
···
 	if (WARN_ON(f1->context != f2->context))
 		return false;
 
-	return __dma_fence_is_later(f1->seqno, f2->seqno, f1->ops);
+	return __dma_fence_is_later(f1, f1->seqno, f2->seqno);
 }
 
 /**