[RFC PATCH 24/29] drm/xe: Add xe_hw_fence_user_init

[Matthew Brost <matthew.brost@intel.com>]

Add xe_hw_fence_user_init which can create a struct xe_hw_fence from a
user input rather than internal LRC state. Used to import user fence and
export them as dma fences.

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
---
 drivers/gpu/drm/xe/xe_hw_fence.c | 17 +++++++++++++++++
 drivers/gpu/drm/xe/xe_hw_fence.h |  3 +++
 2 files changed, 20 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_hw_fence.c b/drivers/gpu/drm/xe/xe_hw_fence.c
index 0b4f12be3692..2ea4d8bca6eb 100644
--- a/drivers/gpu/drm/xe/xe_hw_fence.c
+++ b/drivers/gpu/drm/xe/xe_hw_fence.c
@@ -263,3 +263,20 @@ void xe_hw_fence_init(struct dma_fence *fence, struct xe_hw_fence_ctx *ctx,
 
 	trace_xe_hw_fence_create(hw_fence);
 }
+
+void xe_hw_fence_user_init(struct dma_fence *fence, struct xe_device *xe,
+			   struct iosys_map seqno_map, u64 seqno)
+{
+	struct xe_hw_fence *hw_fence =
+		container_of(fence, typeof(*hw_fence), dma);
+
+	hw_fence->xe = xe;
+	snprintf(hw_fence->name, sizeof(hw_fence->name), "user");
+	hw_fence->seqno_map = seqno_map;
+
+	INIT_LIST_HEAD(&hw_fence->irq_link);
+	dma_fence_init(fence, &xe_hw_fence_ops, &xe->user_fence_irq.lock,
+		       dma_fence_context_alloc(1), seqno);
+
+	trace_xe_hw_fence_create(hw_fence);
+}
diff --git a/drivers/gpu/drm/xe/xe_hw_fence.h b/drivers/gpu/drm/xe/xe_hw_fence.h
index f13a1c4982c7..76571ef2ef36 100644
--- a/drivers/gpu/drm/xe/xe_hw_fence.h
+++ b/drivers/gpu/drm/xe/xe_hw_fence.h
@@ -30,4 +30,7 @@ void xe_hw_fence_free(struct dma_fence *fence);
 
 void xe_hw_fence_init(struct dma_fence *fence, struct xe_hw_fence_ctx *ctx,
 		      struct iosys_map seqno_map);
+void xe_hw_fence_user_init(struct dma_fence *fence, struct xe_device *xe,
+			   struct iosys_map seqno_map, u64 seqno);
+
 #endif
-- 
2.34.1