[PATCH libdrm 2/2] etnaviv: add fence fd support

[Philipp Zabel]

Add etna_cmd_stream_flush_explicit with in-fence fd and out-fence fd
support for explicit fencing.

Signed-off-by: Philipp Zabel <p.za...@pengutronix.de>
---
 etnaviv/etnaviv_cmd_stream.c | 33 +++++++++++++++++++++++++++++----
 etnaviv/etnaviv_drmif.h      |  2 ++
 2 files changed, 31 insertions(+), 4 deletions(-)

diff --git a/etnaviv/etnaviv_cmd_stream.c b/etnaviv/etnaviv_cmd_stream.c
index 9ce3f363..93c46e25 100644
--- a/etnaviv/etnaviv_cmd_stream.c
+++ b/etnaviv/etnaviv_cmd_stream.c
@@ -177,7 +177,8 @@ static uint32_t bo2idx(struct etna_cmd_stream *stream, 
struct etna_bo *bo,
        return idx;
 }
 
-static void flush(struct etna_cmd_stream *stream)
+static void flush(struct etna_cmd_stream *stream, int in_fence_fd,
+                 int *out_fence_fd)
 {
        struct etna_cmd_stream_priv *priv = etna_cmd_stream_priv(stream);
        int ret, id = priv->pipe->id;
@@ -194,8 +195,22 @@ static void flush(struct etna_cmd_stream *stream)
                .stream_size = stream->offset * 4, /* in bytes */
        };
 
+       if (in_fence_fd != -1) {
+               req.flags |= ETNA_SUBMIT_FENCE_FD_IN | ETNA_SUBMIT_NO_IMPLICIT;
+               req.fence_fd = in_fence_fd;
+       }
+
+       if (out_fence_fd)
+               req.flags |= ETNA_SUBMIT_FENCE_FD_OUT;
+
+       /*
+        * Pass the complete submit structure only if flags are set. Otherwise,
+        * only pass the fields up to, but not including the flags field for
+        * backwards compatiblity with older kernels.
+        */
        ret = drmCommandWriteRead(gpu->dev->fd, DRM_ETNAVIV_GEM_SUBMIT,
-                       &req, sizeof(req));
+                       &req, req.flags ? sizeof(req) :
+                       offsetof(struct drm_etnaviv_gem_submit, flags));
 
        if (ret)
                ERROR_MSG("submit failed: %d (%s)", ret, strerror(errno));
@@ -208,11 +223,21 @@ static void flush(struct etna_cmd_stream *stream)
                bo->current_stream = NULL;
                etna_bo_del(bo);
        }
+
+       if (out_fence_fd)
+               *out_fence_fd = req.fence_fd;
 }
 
 void etna_cmd_stream_flush(struct etna_cmd_stream *stream)
 {
-       flush(stream);
+       flush(stream, -1, NULL);
+       reset_buffer(stream);
+}
+
+void etna_cmd_stream_flush_explicit(struct etna_cmd_stream *stream,
+                                   int in_fence_fd, int *out_fence_fd)
+{
+       flush(stream, in_fence_fd, out_fence_fd);
        reset_buffer(stream);
 }
 
@@ -220,7 +245,7 @@ void etna_cmd_stream_finish(struct etna_cmd_stream *stream)
 {
        struct etna_cmd_stream_priv *priv = etna_cmd_stream_priv(stream);
 
-       flush(stream);
+       flush(stream, -1, NULL);
        etna_pipe_wait(priv->pipe, priv->last_timestamp, 5000);
        reset_buffer(stream);
 }
diff --git a/etnaviv/etnaviv_drmif.h b/etnaviv/etnaviv_drmif.h
index 8119baad..e6dbb1d5 100644
--- a/etnaviv/etnaviv_drmif.h
+++ b/etnaviv/etnaviv_drmif.h
@@ -142,6 +142,8 @@ struct etna_cmd_stream *etna_cmd_stream_new(struct 
etna_pipe *pipe, uint32_t siz
 void etna_cmd_stream_del(struct etna_cmd_stream *stream);
 uint32_t etna_cmd_stream_timestamp(struct etna_cmd_stream *stream);
 void etna_cmd_stream_flush(struct etna_cmd_stream *stream);
+void etna_cmd_stream_flush_explicit(struct etna_cmd_stream *stream,
+                                   int in_fence_fd, int *out_fence_fd);
 void etna_cmd_stream_finish(struct etna_cmd_stream *stream);
 
 static inline uint32_t etna_cmd_stream_avail(struct etna_cmd_stream *stream)
-- 
2.11.0

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