1 files changed, 78 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/msm_fence.h b/drivers/gpu/drm/msm/msm_fence.h
new file mode 100644
index 000000000..7f1798c54
--- /dev/null
+++ b/drivers/gpu/drm/msm/msm_fence.h
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2013-2016 Red Hat
+ * Author: Rob Clark <robdclark@gmail.com>
+ */
+
+#ifndef __MSM_FENCE_H__
+#define __MSM_FENCE_H__
+
+#include "msm_drv.h"
+
+/**
+ * struct msm_fence_context - fence context for gpu
+ *
+ * Each ringbuffer has a single fence context, with the GPU writing an
+ * incrementing fence seqno at the end of each submit
+ */
+struct msm_fence_context {
+	struct drm_device *dev;
+	/** name: human readable name for fence timeline */
+	char name[32];
+	/** context: see dma_fence_context_alloc() */
+	unsigned context;
+	/** index: similar to context, but local to msm_fence_context's */
+	unsigned index;
+
+	/**
+	 * last_fence:
+	 *
+	 * Last assigned fence, incremented each time a fence is created
+	 * on this fence context.  If last_fence == completed_fence,
+	 * there is no remaining pending work
+	 */
+	uint32_t last_fence;
+
+	/**
+	 * completed_fence:
+	 *
+	 * The last completed fence, updated from the CPU after interrupt
+	 * from GPU
+	 */
+	uint32_t completed_fence;
+
+	/**
+	 * fenceptr:
+	 *
+	 * The address that the GPU directly writes with completed fence
+	 * seqno.  This can be ahead of completed_fence.  We can peek at
+	 * this to see if a fence has already signaled but the CPU hasn't
+	 * gotten around to handling the irq and updating completed_fence
+	 */
+	volatile uint32_t *fenceptr;
+
+	spinlock_t spinlock;
+};
+
+struct msm_fence_context * msm_fence_context_alloc(struct drm_device *dev,
+		volatile uint32_t *fenceptr, const char *name);
+void msm_fence_context_free(struct msm_fence_context *fctx);
+
+bool msm_fence_completed(struct msm_fence_context *fctx, uint32_t fence);
+void msm_update_fence(struct msm_fence_context *fctx, uint32_t fence);
+
+struct dma_fence * msm_fence_alloc(struct msm_fence_context *fctx);
+
+static inline bool
+fence_before(uint32_t a, uint32_t b)
+{
+   return (int32_t)(a - b) < 0;
+}
+
+static inline bool
+fence_after(uint32_t a, uint32_t b)
+{
+   return (int32_t)(a - b) > 0;
+}
+
+#endif