gallium: handle fence_finish timeout in various drivers

I copied what fence_signalled does.

Reviewed-by: Brian Paul <brianp@vmware.com>

src/gallium/drivers/freedreno/freedreno_fence.c

@@ -69,6 +69,9 @@ boolean fd_screen_fence_finish(struct pipe_screen *screen,
 		struct pipe_fence_handle *fence,
 		uint64_t timeout)
 {
+	if (!timeout)
+		return fd_screen_fence_signalled(screen, fence);
+
 	if (fd_pipe_wait(fence->screen->pipe, fence->timestamp))
 		return false;
 

src/gallium/drivers/i915/i915_screen.c

@@ -478,6 +478,9 @@ i915_fence_finish(struct pipe_screen *screen,
 {
    struct i915_screen *is = i915_screen(screen);
 
+   if (!timeout)
+      return is->iws->fence_signalled(is->iws, fence) == 1;
+
    return is->iws->fence_finish(is->iws, fence) == 1;
 }
 

src/gallium/drivers/llvmpipe/lp_screen.c

@@ -550,6 +550,9 @@ llvmpipe_fence_finish(struct pipe_screen *screen,
 {
    struct lp_fence *f = (struct lp_fence *) fence_handle;
 
+   if (!timeout)
+      return lp_fence_signalled(f);
+
    lp_fence_wait(f);
    return TRUE;
 }

src/gallium/drivers/nouveau/nouveau_screen.c

@@ -79,6 +79,9 @@ nouveau_screen_fence_finish(struct pipe_screen *screen,
 			    struct pipe_fence_handle *pfence,
                             uint64_t timeout)
 {
+	if (!timeout)
+		return nouveau_fence_signalled(nouveau_fence(pfence));
+
 	return nouveau_fence_wait(nouveau_fence(pfence));
 }
 

src/gallium/drivers/svga/svga_screen.c

@@ -560,6 +560,9 @@ svga_fence_finish(struct pipe_screen *screen,
 {
    struct svga_winsys_screen *sws = svga_screen(screen)->sws;
 
+   if (!timeout)
+      return sws->fence_signalled(sws, fence, 0) == 0;
+
    SVGA_DBG(DEBUG_DMA|DEBUG_PERF, "%s fence_ptr %p\n",
             __FUNCTION__, fence);