gpu: nvgpu: Add gk20a_fence type

When moving compression state tracking and compbit management ops to
kernel, we need to attach a fence to dma-buf metadata, along with the
compbit state.

To make in-kernel fence management easier, introduce a new gk20a_fence
abstraction. A gk20a_fence may be backed by a semaphore or a syncpoint
(id, value) pair. If the kernel is configured with CONFIG_SYNC, it will
also contain a sync_fence. The gk20a_fence can easily be converted back
to a syncpoint (id, value) parir or sync FD when we need to return it to
user space.

Change gk20a_submit_channel_gpfifo to return a gk20a_fence instead of
nvhost_fence. This is to facilitate work submission initiated from
kernel.

Bug 1509620

Change-Id: I6154764a279dba83f5e91ba9e0cb5e227ca08e1b
Signed-off-by: Lauri Peltonen <lpeltonen@nvidia.com>
Reviewed-on: http://git-master/r/439846
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/sync_gk20a.h b/drivers/gpu/nvgpu/gk20a/sync_gk20a.h
index 49597f06..e9c26221 100644
--- a/drivers/gpu/nvgpu/gk20a/sync_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/sync_gk20a.h
@@ -29,7 +29,7 @@ struct gk20a_semaphore;
 struct sync_timeline *gk20a_sync_timeline_create(const char *fmt, ...);
 void gk20a_sync_timeline_destroy(struct sync_timeline *);
 void gk20a_sync_timeline_signal(struct sync_timeline *);
-int gk20a_sync_fence_create(struct sync_timeline *,
+struct sync_fence *gk20a_sync_fence_create(struct sync_timeline *,
                 struct gk20a_semaphore *,
                 struct sync_fence *dependency,
                 const char *fmt, ...);