drm/etnaviv: return GPU fence through the submit structure

The next patch will need the complete dma_fence, instead of just the seqno,
to create the sync_file in etnaviv_ioctl_gem_submit, in case an
out_fence_fd is requested.

The submit needs to hold a reference to the dma_fence, to avoid raceing
with the GPU completing the fence.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de>
---
New patch in v3.

3 files changed, 6 insertions, 4 deletions

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.h b/drivers/gpu/drm/etnaviv/etnaviv_gem.h
index 120410d67eb5..c4a091e87426 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.h
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.h
@@ -20,6 +20,7 @@
 #include <linux/reservation.h>
 #include "etnaviv_drv.h"
 
+struct dma_fence;
 struct etnaviv_gem_ops;
 struct etnaviv_gem_object;
 
@@ -104,7 +105,7 @@ struct etnaviv_gem_submit {
         struct drm_device *dev;
         struct etnaviv_gpu *gpu;
         struct ww_acquire_ctx ticket;
-        u32 fence;
+        struct dma_fence *fence;
         unsigned int nr_bos;
         struct etnaviv_gem_submit_bo bos[0];
         u32 flags;
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
index fb8d5befbf4f..1b6f9b843815 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
@@ -294,6 +294,7 @@ static void submit_cleanup(struct etnaviv_gem_submit *submit)
         }
 
         ww_acquire_fini(&submit->ticket);
+        dma_fence_put(submit->fence);
         kfree(submit);
 }
 
@@ -435,7 +436,7 @@ int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data,
         if (ret == 0)
                 cmdbuf = NULL;
 
-        args->fence = submit->fence;
+        args->fence = submit->fence->seqno;
 
 out:
         submit_unpin_objects(submit);
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
index 68a4f59e4c22..bafbcb463555 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
@@ -1337,8 +1337,8 @@ int etnaviv_gpu_submit(struct etnaviv_gpu *gpu,
         mutex_lock(&gpu->lock);
 
         gpu->event[event].fence = fence;
-        submit->fence = fence->seqno;
-        gpu->active_fence = submit->fence;
+        submit->fence = dma_fence_get(fence);
+        gpu->active_fence = submit->fence->seqno;
 
         if (gpu->lastctx != cmdbuf->ctx) {
                 gpu->mmu->need_flush = true;