tegra: Allow channels to return a version

When opening a channel, allow a version number to be returned so that
userspace can parameterize based on it, rather than having to guess a
version from the environment.

Signed-off-by: Thierry Reding <treding@nvidia.com>

3 files changed, 8 insertions, 0 deletions

diff --git a/tegra/channel.c b/tegra/channel.c
index 4a41daaa..9c7d8016 100644
--- a/tegra/channel.c
+++ b/tegra/channel.c
@@ -75,6 +75,7 @@ int drm_tegra_channel_open(struct drm_tegra_channel **channelp,
     }
 
     channel->num_syncpts = args.syncpts;
+    channel->version = args.version;
     channel->context = args.context;
     channel->class = class;
 
@@ -110,3 +111,8 @@ unsigned int drm_tegra_channel_get_syncpoints(struct drm_tegra_channel *channel)
 {
     return channel->num_syncpts;
 }
+
+unsigned int drm_tegra_channel_get_version(struct drm_tegra_channel *channel)
+{
+    return channel->version;
+}
diff --git a/tegra/private.h b/tegra/private.h
index 9e9ae86c..c30fd68f 100644
--- a/tegra/private.h
+++ b/tegra/private.h
@@ -71,6 +71,7 @@ struct drm_tegra_channel {
     struct drm_tegra *drm;
     enum host1x_class class;
     unsigned int num_syncpts;
+    unsigned int version;
     uint64_t context;
 };
 
diff --git a/tegra/tegra.h b/tegra/tegra.h
index c8576751..f0b68ddc 100644
--- a/tegra/tegra.h
+++ b/tegra/tegra.h
@@ -85,6 +85,7 @@ int drm_tegra_channel_open(struct drm_tegra_channel **channelp,
                            enum drm_tegra_class client);
 int drm_tegra_channel_close(struct drm_tegra_channel *channel);
 unsigned int drm_tegra_channel_get_syncpoints(struct drm_tegra_channel *channel);
+unsigned int drm_tegra_channel_get_version(struct drm_tegra_channel *channel);
 
 int drm_tegra_fence_wait(struct drm_tegra *drm, struct drm_tegra_fence *fence);