dma-fence: Introduce drm_fence_set_error() helper

commit a009e975 upstream.

The dma_fence.error field (formerly known as dma_fence.status) is an
optional field that may be set by drivers before calling
dma_fence_signal(). The field can be used to indicate that the fence was
completed in err rather than with success, and is visible to other
consumers of the fence and to userspace via sync_file.

This patch renames the field from status to error so that its meaning is
hopefully more clear (and distinct from dma_fence_get_status() which is
a composite between the error state and signal state) and adds a helper
that validates the preconditions of when it is suitable to adjust the
error field.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Sumit Semwal <sumit.semwal@linaro.org>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170104141222.6992-3-chris@chris-wilson.co.uk
[s/dma_fence/fence/g - gregkh]
Cc: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/dma-buf/fence.c

@@ -551,7 +551,7 @@ fence_init(struct fence *fence, const struct fence_ops *ops,
 	fence->context = context;
 	fence->seqno = seqno;
 	fence->flags = 0UL;
-	fence->status = 0;
+	fence->error = 0;
 
 	trace_fence_init(fence);
 }

include/linux/fence.h

@@ -47,7 +47,7 @@ struct fence_cb;
  * can be compared to decide which fence would be signaled later.
  * @flags: A mask of FENCE_FLAG_* defined below
  * @timestamp: Timestamp when the fence was signaled.
- * @status: Optional, only valid if < 0, must be set before calling
+ * @error: Optional, only valid if < 0, must be set before calling
  * fence_signal, indicates that the fence has completed with an error.
  *
  * the flags member must be manipulated and read using the appropriate
@@ -79,7 +79,7 @@ struct fence {
 	unsigned seqno;
 	unsigned long flags;
 	ktime_t timestamp;
-	int status;
+	int error;
 };
 
 enum fence_flag_bits {
@@ -132,7 +132,7 @@ struct fence_cb {
  * or some failure occurred that made it impossible to enable
  * signaling. True indicates successful enabling.
  *
- * fence->status may be set in enable_signaling, but only when false is
+ * fence->error may be set in enable_signaling, but only when false is
  * returned.
  *
  * Calling fence_signal before enable_signaling is called allows
@@ -144,7 +144,7 @@ struct fence_cb {
  * the second time will be a noop since it was already signaled.
  *
  * Notes on signaled:
- * May set fence->status if returning true.
+ * May set fence->error if returning true.
  *
  * Notes on wait:
  * Must not be NULL, set to fence_default_wait for default implementation.
@@ -351,13 +351,33 @@ static inline struct fence *fence_later(struct fence *f1, struct fence *f2)
 static inline int fence_get_status_locked(struct fence *fence)
 {
 	if (fence_is_signaled_locked(fence))
-		return fence->status < 0 ? fence->status : 1;
+		return fence->error ?: 1;
 	else
 		return 0;
 }
 
 int fence_get_status(struct fence *fence);
 
+/**
+ * fence_set_error - flag an error condition on the fence
+ * @fence: [in]	the fence
+ * @error: [in]	the error to store
+ *
+ * Drivers can supply an optional error status condition before they signal
+ * the fence, to indicate that the fence was completed due to an error
+ * rather than success. This must be set before signaling (so that the value
+ * is visible before any waiters on the signal callback are woken). This
+ * helper exists to help catching erroneous setting of #fence.error.
+ */
+static inline void fence_set_error(struct fence *fence,
+				       int error)
+{
+	BUG_ON(test_bit(FENCE_FLAG_SIGNALED_BIT, &fence->flags));
+	BUG_ON(error >= 0 || error < -MAX_ERRNO);
+
+	fence->error = error;
+}
+
 signed long fence_wait_timeout(struct fence *, bool intr, signed long timeout);
 signed long fence_wait_any_timeout(struct fence **fences, uint32_t count,
 				   bool intr, signed long timeout);