gitlab-ci: Run the GLES2 CTS on llvmpipe.

This is the start of doing CTS tests on merges to Mesa master.  We use
the surfaceless platform so that we don't need to bother bringing up
weston or X11.  The surface size is kept low to reduce runtime, but
this comes at the cost of many rendering tests skipping due to
too-small render targets (as we see the impact of Mesa on the shared
runner pool, we can reevaluate this and what set of CTS tests we want
to run).

We split the job up across 4 runners (each at 4 llvmpipe threads), so
that the job can load-balance across our shared runners and finish
sooner (since dEQP is very single-thread-performance bound).

Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index aca5d76..22aa424 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -26,6 +26,7 @@
 stages:
   - containers-build
   - build+test
+  - test
 
 
 # When to automatically run the CI
@@ -39,6 +40,14 @@
     when:
       - runner_system_failure
 
+.ci-deqp-artifacts: &ci-deqp-artifacts
+  artifacts:
+    when: always
+    untracked: false
+    paths:
+      # Watch out!  Artifacts are relative to the build dir.
+      # https://gitlab.com/gitlab-org/gitlab-ce/commit/8788fb925706cad594adf6917a6c5f6587dd1521
+      - artifacts
 
 # CONTAINERS
 
@@ -77,6 +86,12 @@
     - ccache --zero-stats || true
     - ccache --show-stats || true
   after_script:
+    # In case the install dir is being saved as artifacts, tar it up
+    # so that symlinks and hardlinks aren't each packed separately in
+    # the zip file.
+    - if [ -d install ]; then
+        tar -cf artifacts/install.tar install;
+      fi
     - export CCACHE_DIR="$PWD/ccache"
     - ccache --show-stats
 
@@ -176,6 +191,7 @@
       -D tools=all
     MESON_SHADERDB: "true"
     BUILDTYPE: "debugoptimized"
+  <<: *ci-deqp-artifacts
 
 meson-clover:
   extends: .meson-build
@@ -247,6 +263,7 @@
       -D gallium-xa=false
       -D gallium-nine=false
       -D llvm=false
+  <<: *ci-deqp-artifacts
   script:
     - .gitlab-ci/meson-build.sh
 
@@ -306,3 +323,32 @@
     LLVM_VERSION: "3.4"
     # LLVM 3.4 packages were built with an old libstdc++ ABI
     CXX: "g++ -D_GLIBCXX_USE_CXX11_ABI=0"
+
+.deqp-test:
+  <<: *ci-run-policy
+  stage: test
+  image: $DEBIAN_IMAGE
+  variables:
+    GIT_STRATEGY: none # testing doesn't build anything from source
+    DEQP_SKIPS: deqp-default-skips.txt
+  script:
+    # Note: Build dir (and thus install) may be dirty due to GIT_STRATEGY
+    - rm -rf install
+    - tar -xf artifacts/install.tar
+    - ./artifacts/deqp-runner.sh
+  artifacts:
+    when: on_failure
+    name: "$CI_JOB_NAME-$CI_COMMIT_REF_NAME"
+    paths:
+      - results/
+
+test-llvmpipe-gles2:
+  parallel: 4
+  variables:
+    DEQP_VER: gles2
+    DEQP_EXPECTED_FAILS: deqp-llvmpipe-fails.txt
+    LIBGL_ALWAYS_SOFTWARE: "true"
+    DEQP_RENDERER_MATCH: "llvmpipe"
+  extends: .deqp-test
+  dependencies:
+    - meson-main