From 166da9355d95affe427a6cff3525df60e80a99df Mon Sep 17 00:00:00 2001
From: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
Date: Mon, 21 Aug 2006 21:02:08 +0200
Subject: User / Kernel space fence objects (device-independent part).

---
 libdrm/xf86drm.c | 119 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 libdrm/xf86drm.h |  20 ++++++++++
 2 files changed, 139 insertions(+)

(limited to 'libdrm')

diff --git a/libdrm/xf86drm.c b/libdrm/xf86drm.c
index c9f1b2db..6302db3a 100644
--- a/libdrm/xf86drm.c
+++ b/libdrm/xf86drm.c
@@ -2236,3 +2236,122 @@ int drmCommandWriteRead(int fd, unsigned long drmCommandIndex, void *data,
     }
     return 0;
 }
+
+int drmFenceCreate(int fd, int shareable, unsigned type, int emit, 
+		   drmFence *fence)
+{
+    drm_fence_arg_t arg;
+    
+    arg.type = type;
+    arg.flags = (shareable) ? DRM_FENCE_FLAG_SHAREABLE : 0;
+    arg.flags |= (emit) ? DRM_FENCE_FLAG_EMIT : 0;
+    arg.op = drm_fence_create;
+    if (ioctl(fd, DRM_IOCTL_FENCE, &arg))
+	return -errno;
+    fence->handle = arg.handle;
+    fence->type = arg.type;
+    fence->signaled = 0;
+    return 0;
+}
+    
+int drmFenceDestroy(int fd, const drmFence *fence)
+{
+    drm_fence_arg_t arg;
+   
+    arg.handle = fence->handle;
+    arg.op = drm_fence_destroy;
+    if (ioctl(fd, DRM_IOCTL_FENCE, &arg))
+	return -errno;
+    return 0;
+}
+
+int drmFenceReference(int fd, unsigned handle, drmFence *fence)
+{
+    drm_fence_arg_t arg;
+   
+    arg.handle = handle;
+    arg.op = drm_fence_reference;
+    if (ioctl(fd, DRM_IOCTL_FENCE, &arg))
+	return -errno;
+    fence->handle = arg.handle;
+    fence->type = arg.type;
+    fence->signaled = arg.signaled;
+    return 0;
+}
+
+int drmFenceUnreference(int fd, const drmFence *fence)
+{
+    drm_fence_arg_t arg;
+   
+    arg.handle = fence->handle;
+    arg.op = drm_fence_unreference;
+    if (ioctl(fd, DRM_IOCTL_FENCE, &arg))
+	return -errno;
+    return 0;
+}
+
+int drmFenceFlush(int fd, drmFence *fence, unsigned flush_type)
+{
+    drm_fence_arg_t arg;
+   
+    arg.handle = fence->handle;
+    arg.type = flush_type;
+    arg.op = drm_fence_flush;
+    if (ioctl(fd, DRM_IOCTL_FENCE, &arg))
+	return -errno;
+    fence->type = arg.type;
+    fence->signaled = arg.signaled;
+    return 0;
+}
+
+int drmFenceSignaled(int fd, drmFence *fence)
+{
+    drm_fence_arg_t arg;
+   
+    arg.handle = fence->handle;
+    arg.op = drm_fence_signaled;
+    if (ioctl(fd, DRM_IOCTL_FENCE, &arg))
+	return -errno;
+    fence->type = arg.type;
+    fence->signaled = arg.signaled;
+    return 0;
+}
+
+int drmFenceEmit(int fd, drmFence *fence, unsigned emit_type)
+{
+    drm_fence_arg_t arg;
+   
+    arg.handle = fence->handle;
+    arg.type = emit_type;
+    arg.op = drm_fence_emit;
+    if (ioctl(fd, DRM_IOCTL_FENCE, &arg))
+	return -errno;
+    fence->type = arg.type;
+    fence->signaled = arg.signaled;
+    return 0;
+}
+    
+int drmFenceWait(int fd, drmFence *fence, unsigned flush_type, 
+		 int lazy, int ignore_signals)
+{
+    drm_fence_arg_t arg;
+    int ret;
+
+    arg.handle = fence->handle;
+    arg.type = flush_type;
+    arg.flags = (lazy) ? DRM_FENCE_FLAG_WAIT_LAZY : 0;
+    arg.flags |= (ignore_signals) ? DRM_FENCE_FLAG_WAIT_IGNORE_SIGNALS : 0;
+    arg.op = drm_fence_wait;
+    do {
+	ret = ioctl(fd, DRM_IOCTL_FENCE, &arg);
+    } while (ret != 0 && errno == EAGAIN);
+
+    if (ret)
+	return -errno;
+
+    fence->type = arg.type;
+    fence->signaled = arg.signaled;
+    return 0;
+}    
+
+
diff --git a/libdrm/xf86drm.h b/libdrm/xf86drm.h
index 48a18f29..0e037daa 100644
--- a/libdrm/xf86drm.h
+++ b/libdrm/xf86drm.h
@@ -280,6 +280,11 @@ typedef struct _drmSetVersion {
 	int drm_dd_minor;
 } drmSetVersion, *drmSetVersionPtr;
 
+typedef struct _drmFence{
+        unsigned handle;
+        unsigned type; 
+        unsigned signaled;
+} drmFence;
 
 #define __drm_dummy_lock(lock) (*(__volatile__ unsigned int *)lock)
 
@@ -596,6 +601,21 @@ extern int           drmScatterGatherFree(int fd, drm_handle_t handle);
 
 extern int           drmWaitVBlank(int fd, drmVBlankPtr vbl);
 
+/* Fencing */
+
+extern int           drmFenceCreate(int fd, int shareable, unsigned type, int emit, 
+				    drmFence *fence);
+extern int           drmFenceDestroy(int fd, const drmFence *fence);
+extern int           drmFenceReference(int fd, unsigned handle, drmFence *fence);
+extern int           drmFenceUnreference(int fd, const drmFence *fence);
+extern int           drmFenceFlush(int fd, drmFence *fence, unsigned flush_type);
+extern int           drmFenceSignaled(int fd, drmFence *fence);
+extern int           drmFenceWait(int fd, drmFence *fence, unsigned flush_type, 
+				  int lazy, int ignore_signals);
+extern int           drmFenceEmit(int fd, drmFence *fence, unsigned emit_type);
+
+
+
 /* Support routines */
 extern int           drmError(int err, const char *label);
 extern void          *drmMalloc(int size);
-- 
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