Debugging fd mix-ups (ie. where, possibly via close()ing the original
fd, etc, you end up with something that is a valid fd but not a valid
*fence* fd) can be difficult. Fortunately we can use the FILE_INFO
ioctl, which will return an error if the fd is not a fence fd.
For android, we instead use the libsync API, which does a similar thing
on modern kernels, but has a fallback path for older android kernels.
Note that the FILE_INFO ioctl has existed upstream since at least prior
to destaging of sync_file.
Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11202>
Previously, we included the stubs in our driver binaries, so they didn't
call the actual system libraries for these functions. This was enough to
build-test the Android code in CI without even the NDK.
To make NDK-built Mesa drivers useful, we need to link against these
system libraries that aren't present in the NDK. Split the symbols to
separate non-installed shared libraries and link against those, so that
when you drop the resulting .so in your /vendor/lib64/hw/, it just works
out.
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6805>
Rob Clark
Eric Anholt