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, 6 insertions, 1 deletions

diff --git a/meson.build b/meson.build
index 3dc1271f2ac..7658f6e63da 100644
--- a/meson.build
+++ b/meson.build
@@ -135,6 +135,7 @@ with_gallium_vc4 = false
 with_gallium_vc5 = false
 with_gallium_etnaviv = false
 with_gallium_imx = false
+with_gallium_tegra = false
 with_gallium_i915 = false
 with_gallium_svga = false
 with_gallium_virgl = false
@@ -146,7 +147,7 @@ if _drivers == 'auto'
     if ['x86', 'x86_64'].contains(host_machine.cpu_family())
       _drivers = 'r300,r600,radeonsi,nouveau,virgl,svga,swrast'
     elif ['arm', 'aarch64'].contains(host_machine.cpu_family())
-      _drivers = 'pl111,vc4,vc5,freedreno,etnaviv,imx,virgl,svga,swrast'
+      _drivers = 'pl111,vc4,vc5,freedreno,etnaviv,imx,nouveau,tegra,virgl,svga,swrast'
     else
       error('Unknown architecture. Please pass -Dgallium-drivers to set driver options. Patches gladly accepted to fix this.')
     endif
@@ -169,6 +170,7 @@ if _drivers != ''
   with_gallium_vc5 = _split.contains('vc5')
   with_gallium_etnaviv = _split.contains('etnaviv')
   with_gallium_imx = _split.contains('imx')
+  with_gallium_tegra = _split.contains('tegra')
   with_gallium_i915 = _split.contains('i915')
   with_gallium_svga = _split.contains('svga')
   with_gallium_virgl = _split.contains('virgl')
@@ -220,6 +222,9 @@ endif
 if with_gallium_pl111 and not with_gallium_vc4
   error('pl111 driver requires vc4 driver')
 endif
+if with_gallium_tegra and not with_gallium_nouveau
+  error('tegra driver requires nouveau driver')
+endif
 
 dep_libdrm_intel = []
 if with_dri_i915 or with_gallium_i915