dma-buf: Rename struct fence to dma_fence

I plan to usurp the short name of struct fence for a core kernel struct,
and so I need to rename the specialised fence/timeline for DMA
operations to make room.

A consensus was reached in
https://lists.freedesktop.org/archives/dri-devel/2016-July/113083.html
that making clear this fence applies to DMA operations was a good thing.
Since then the patch has grown a bit as usage increases, so hopefully it
remains a good thing!

(v2...: rebase, rerun spatch)
v3: Compile on msm, spotted a manual fixup that I broke.
v4: Try again for msm, sorry Daniel

coccinelle script:
@@

@@
- struct fence
+ struct dma_fence
@@

@@
- struct fence_ops
+ struct dma_fence_ops
@@

@@
- struct fence_cb
+ struct dma_fence_cb
@@

@@
- struct fence_array
+ struct dma_fence_array
@@

@@
- enum fence_flag_bits
+ enum dma_fence_flag_bits
@@

@@
(
- fence_init
+ dma_fence_init
|
- fence_release
+ dma_fence_release
|
- fence_free
+ dma_fence_free
|
- fence_get
+ dma_fence_get
|
- fence_get_rcu
+ dma_fence_get_rcu
|
- fence_put
+ dma_fence_put
|
- fence_signal
+ dma_fence_signal
|
- fence_signal_locked
+ dma_fence_signal_locked
|
- fence_default_wait
+ dma_fence_default_wait
|
- fence_add_callback
+ dma_fence_add_callback
|
- fence_remove_callback
+ dma_fence_remove_callback
|
- fence_enable_sw_signaling
+ dma_fence_enable_sw_signaling
|
- fence_is_signaled_locked
+ dma_fence_is_signaled_locked
|
- fence_is_signaled
+ dma_fence_is_signaled
|
- fence_is_later
+ dma_fence_is_later
|
- fence_later
+ dma_fence_later
|
- fence_wait_timeout
+ dma_fence_wait_timeout
|
- fence_wait_any_timeout
+ dma_fence_wait_any_timeout
|
- fence_wait
+ dma_fence_wait
|
- fence_context_alloc
+ dma_fence_context_alloc
|
- fence_array_create
+ dma_fence_array_create
|
- to_fence_array
+ to_dma_fence_array
|
- fence_is_array
+ dma_fence_is_array
|
- trace_fence_emit
+ trace_dma_fence_emit
|
- FENCE_TRACE
+ DMA_FENCE_TRACE
|
- FENCE_WARN
+ DMA_FENCE_WARN
|
- FENCE_ERR
+ DMA_FENCE_ERR
)
 (
 ...
 )

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20161025120045.28839-1-chris@chris-wilson.co.uk

include/linux/seqno-fence.h

@@ -20,7 +20,7 @@
 #ifndef __LINUX_SEQNO_FENCE_H
 #define __LINUX_SEQNO_FENCE_H
 
-#include <linux/fence.h>
+#include <linux/dma-fence.h>
 #include <linux/dma-buf.h>
 
 enum seqno_fence_condition {
@@ -29,15 +29,15 @@ enum seqno_fence_condition {
 };
 
 struct seqno_fence {
-	struct fence base;
+	struct dma_fence base;
 
-	const struct fence_ops *ops;
+	const struct dma_fence_ops *ops;
 	struct dma_buf *sync_buf;
 	uint32_t seqno_ofs;
 	enum seqno_fence_condition condition;
 };
 
-extern const struct fence_ops seqno_fence_ops;
+extern const struct dma_fence_ops seqno_fence_ops;
 
 /**
  * to_seqno_fence - cast a fence to a seqno_fence
@@ -47,7 +47,7 @@ extern const struct fence_ops seqno_fence_ops;
  * or the seqno_fence otherwise.
  */
 static inline struct seqno_fence *
-to_seqno_fence(struct fence *fence)
+to_seqno_fence(struct dma_fence *fence)
 {
 	if (fence->ops != &seqno_fence_ops)
 		return NULL;
@@ -83,9 +83,9 @@ to_seqno_fence(struct fence *fence)
  * dma-buf for sync_buf, since mapping or unmapping the sync_buf to the
  * device's vm can be expensive.
  *
- * It is recommended for creators of seqno_fence to call fence_signal
+ * It is recommended for creators of seqno_fence to call dma_fence_signal()
  * before destruction. This will prevent possible issues from wraparound at
- * time of issue vs time of check, since users can check fence_is_signaled
+ * time of issue vs time of check, since users can check dma_fence_is_signaled()
  * before submitting instructions for the hardware to wait on the fence.
  * However, when ops.enable_signaling is not called, it doesn't have to be
  * done as soon as possible, just before there's any real danger of seqno
@@ -96,18 +96,18 @@ seqno_fence_init(struct seqno_fence *fence, spinlock_t *lock,
 		 struct dma_buf *sync_buf,  uint32_t context,
 		 uint32_t seqno_ofs, uint32_t seqno,
 		 enum seqno_fence_condition cond,
-		 const struct fence_ops *ops)
+		 const struct dma_fence_ops *ops)
 {
 	BUG_ON(!fence || !sync_buf || !ops);
 	BUG_ON(!ops->wait || !ops->enable_signaling ||
 	       !ops->get_driver_name || !ops->get_timeline_name);
 
 	/*
-	 * ops is used in fence_init for get_driver_name, so needs to be
+	 * ops is used in dma_fence_init for get_driver_name, so needs to be
 	 * initialized first
 	 */
 	fence->ops = ops;
-	fence_init(&fence->base, &seqno_fence_ops, lock, context, seqno);
+	dma_fence_init(&fence->base, &seqno_fence_ops, lock, context, seqno);
 	get_dma_buf(sync_buf);
 	fence->sync_buf = sync_buf;
 	fence->seqno_ofs = seqno_ofs;