Actually cycle through GPU IDs in find_suitable_gpu

In the current version, if the first returned GPU does not have the
desired features, we are stuck in an endless loop, since we always
retry with the exact same ID.

This patch adds an increment to core_id, assuming thats how we are
supposed to cycle through the GPUs.

Tested on an IMX6Q6AVT10AD where it works with this patch applied.

Signed-off-by: David Oberhollenzer <>
1 file changed
tree: f509dd3ef6913a931617d5311956ef70ef879284
  1. .gitignore
  7. src/

Etnaviv GPU tests

This contains various tests for Vivante GPUs based on the Etnaviv DRM driver.



For cross-builds simply pass --host=<toolchain-tuple> to configure. You may have to override PKG_CONFIG_PATH PKG_CONFIG_SYSROOT_DIR PKG_CONFIG_LIBDIR as well to make it able to find the DRM libraries.


This package needs libdrm installed with libdrm_etnaviv enabled. MESA is not necessary.



This is an extremely basic test that writes “Hello World” to memory from a CL shader.


The intent of this test is to test the output of various opcodes against putative CPU implementation of the same operation, and thus figure out exactly what the GPU instructions do.

This is achieved by using the CL (OpenCL) functionality of GC2000 and higher.

Example output:

$ etnaviv_verifyops /dev/dri/renderD128
Version: 1.0.0
  Name: etnaviv
  Date: 20151214
  Description: etnaviv DRM
add.u32: PASS
imullo0.u32: PASS
lshift.u32: PASS
rshift.u32: PASS
rotate.u32: PASS
or.u32: PASS
and.u32: PASS
xor.u32: PASS
not.u32: PASS


Executes various CL shader benchmarks.

The goal is to figure out how the use of various instructions impacts performance.

However currently they all measure memory throughput.

Example output:

[read]    [ram]    Speed: 113.606 MB/s
[readacc] [ram]    Speed:  82.522 MB/s
[write]   [ram]    Speed: 234.779 MB/s