tegra: Initial support

Tegra K1 and later use a GPU that can be driven by the Nouveau driver.
But the GPU is a pure render node and has no display engine, hence the
scanout needs to happen on the Tegra display hardware. The GPU and the
display engine each have a separate DRM device node exposed by the
kernel.

To make the setup appear as a single device, this driver instantiates
a Nouveau screen with each instance of a Tegra screen and forwards GPU
requests to the Nouveau screen. For purposes of scanout it will import
buffers created on the GPU into the display driver. Handles that
userspace requests are those of the display driver so that they can be
used to create framebuffers.

This has been tested with some GBM test programs, as well as kmscube and
weston. All of those run without modifications, but I'm sure there is a
lot that can be improved.

Some fixes contributed by Hector Martin <[email protected]>.

Changes in v2:
- duplicate file descriptor in winsys to avoid potential issues
- require nouveau when building the tegra driver
- check for nouveau driver name on render node
- remove unneeded dependency on libdrm_tegra
- remove zombie references to libudev
- add missing headers to C_SOURCES variable
- drop unneeded tegra/ prefix for includes
- open device files with O_CLOEXEC
- update copyrights

Changes in v3:
- properly unwrap resources in ->resource_copy_region()
- support vertex buffers passed by user pointer
- allocate custom stream and const uploader
- silence error message on pre-Tegra124
- support X without explicit PRIME

Changes in v4:
- ship Meson build files in distribution tarball
- drop duplicate driver_tegra dependency

Reviewed-by: Emil Velikov <[email protected]>
Acked-by: Emil Velikov <[email protected]>
Tested-by: Andre Heider <[email protected]>
Reviewed-by: Dmitry Osipenko <[email protected]>
Reviewed-by: Dylan Baker <[email protected]>
Signed-off-by: Thierry Reding <[email protected]>

1 files changed, 81 insertions, 0 deletions

diff --git a/src/gallium/drivers/tegra/tegra_context.h b/src/gallium/drivers/tegra/tegra_context.h
new file mode 100644
index 00000000000..4869b0913a6
--- /dev/null
+++ b/src/gallium/drivers/tegra/tegra_context.h
@@ -0,0 +1,81 @@
+/*
+ * Copyright © 2014-2018 NVIDIA Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef TEGRA_CONTEXT_H
+#define TEGRA_CONTEXT_H
+
+#include "pipe/p_context.h"
+#include "pipe/p_state.h"
+
+struct tegra_screen;
+
+struct tegra_context {
+   struct pipe_context base;
+   struct pipe_context *gpu;
+};
+
+static inline struct tegra_context *
+to_tegra_context(struct pipe_context *context)
+{
+   return (struct tegra_context *)context;
+}
+
+struct pipe_context *
+tegra_screen_context_create(struct pipe_screen *pscreen, void *priv,
+                            unsigned int flags);
+
+struct tegra_sampler_view {
+   struct pipe_sampler_view base;
+   struct pipe_sampler_view *gpu;
+};
+
+static inline struct tegra_sampler_view *
+to_tegra_sampler_view(struct pipe_sampler_view *view)
+{
+   return (struct tegra_sampler_view *)view;
+}
+
+static inline struct pipe_sampler_view *
+tegra_sampler_view_unwrap(struct pipe_sampler_view *view)
+{
+   if (!view)
+      return NULL;
+
+   return to_tegra_sampler_view(view)->gpu;
+}
+
+struct tegra_transfer {
+   struct pipe_transfer base;
+   struct pipe_transfer *gpu;
+
+   unsigned int count;
+   void *map;
+};
+
+static inline struct tegra_transfer *
+to_tegra_transfer(struct pipe_transfer *transfer)
+{
+   return (struct tegra_transfer *)transfer;
+}
+
+#endif /* TEGRA_SCREEN_H */