gallium: add renderonly library

This a very lightweight library to add basic support for renderonly
GPUs. A kms gallium driver must specify how a renderonly_scanout
objects gets created. Also it must provide file handles to the used
kms device and the used gpu device.

This could look like:
struct renderonly ro = {
   .create_for_resource = renderonly_create_gpu_import_for_resource,
   .kms_fd = fd,
   .gpu_fd = open("/dev/dri/renderD128", O_RDWR | O_CLOEXEC)
};

The renderonly_scanout object exits for two reasons:
 - Do any special treatment for a scanout resource like importing the
   GPU resource into the scanout hw.
 - Make it easier for a gallium driver to detect if anything special
   needs to be done in flush_resource(..) like a resolve to linear.

A GPU gallium driver which gets used as renderonly GPU needs to be
aware of the renderonly library.

This library will likely break android support and hopefully will get
replaced with a better solution based on gbm2.

Changes from V1 -> V2:
 - reworked the lifecycle of renderonly object (suggested by Nicolai Hähnle)
 - killed the midlayer (suggested by Thierry Reding)
 - made the API more explicit regarding gpu and kms fd's
 - added some docs

Signed-off-by: Christian Gmeiner <[email protected]>
Acked-by: Emil Velikov <[email protected]>
Tested-by: Alexandre Courbot <[email protected]>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/Makefile.sources b/src/gallium/auxiliary/Makefile.sources
index 5d4fe30e4f1..8d3e4a95c66 100644
--- a/src/gallium/auxiliary/Makefile.sources
+++ b/src/gallium/auxiliary/Makefile.sources
@@ -435,3 +435,7 @@ GALLIVM_SOURCES := \
 	draw/draw_llvm_sample.c \
 	draw/draw_pt_fetch_shade_pipeline_llvm.c \
 	draw/draw_vs_llvm.c
+
+RENDERONLY_SOURCES := \
+	renderonly/renderonly.c \
+	renderonly/renderonly.h