gpu: nvgpu: add update callback to gk20a channel

Add support for a callback function with user data pointer to be
scheduled from the end of gk20a_channel_update. The function and its
private data are supplied when opening a new channel.

Change-Id: Ib6b408855ea60d46a6a114a69c01904703019572
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: http://git-master/r/552014
Reviewed-by: Arto Merilainen <amerilainen@nvidia.com>
Tested-by: Arto Merilainen <amerilainen@nvidia.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/channel_gk20a.h b/drivers/gpu/nvgpu/gk20a/channel_gk20a.h
index a17e6ea9..aa87464b 100644
--- a/drivers/gpu/nvgpu/gk20a/channel_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/channel_gk20a.h
@@ -157,6 +157,12 @@ struct channel_gk20a {
 
         /* event support */
         struct channel_gk20a_poll_events poll_events;
+
+        /* signal channel owner via a callback, if set, in gk20a_channel_update
+         * via schedule_work */
+        void (*update_fn)(struct channel_gk20a *, void *);
+        void *update_fn_data;
+        struct work_struct update_fn_work;
 };
 
 static inline bool gk20a_channel_as_bound(struct channel_gk20a *ch)
@@ -196,6 +202,9 @@ void gk20a_init_channel(struct gpu_ops *gops);
 
 int gk20a_wait_channel_idle(struct channel_gk20a *ch);
 struct channel_gk20a *gk20a_open_new_channel(struct gk20a *g);
+struct channel_gk20a *gk20a_open_new_channel_with_cb(struct gk20a *g,
+                void (*update_fn)(struct channel_gk20a *, void *),
+                void *update_fn_data);
 void channel_gk20a_unbind(struct channel_gk20a *ch_gk20a);
 
 int gk20a_submit_channel_gpfifo(struct channel_gk20a *c,