workflows: We all love checkpatch, so add it to the CI workflows

This is currently running on defaults, so the --strict desired
for media drivers and similar won't be observed. That may be
possible to add later.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>

.github: Add Github Workflow for KUnit

Now that we have some KUnit coverage, let's add a github actions file to
run them on each push or pull request.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>

.github/workflows: Add dtoverlaycheck workflow

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>

.github/workflows: Create workflow to CI kernel builds

Builds the bcmrpi, bcm2709, bcm2711, and bcm2835 32 bit kernels,
and defconfig and bcm2711 64bit kernels, saving the artifacts for
7 days.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>

.github: Skip broken Generic DRM/KMS Unit Tests

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

.github/workflows: Set warnings-as-errors for builds

To avoid code with build warnings being introduced into the tree, force
CONFIG_WERROR=y in the build workflow.

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

.github/workflows: Correct kernel builds artifacts

Modify the kernel build workflow to create artifacts with the correct
names and structure, both as an example of what we expect and in case
anyone wants to use the output.

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

.github/workflows: Switch to a matrix build

Remove the per-build duplication by putting build parameters in a
matrix.

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

.github/workflows: Retain artifacts for 90 days

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

.github/workflows: Add a bcm2712 build configuration

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

Update kernel-build.yml to use node.js 20

Upgrade the actions to v4 to get rid of the warning about migrating from node.js 16.

Update kunit.yml to use node.js 20

Bump actions/checkout to v4.

Update dtoverlaycheck.yml to node.js 20

.github/workflows/checkpatch.yml

@@ -0,0 +1,18 @@
+name: Advisory checkpatch review
+on: [pull_request]
+
+jobs:
+  review:
+    name: checkpatch review
+    runs-on: ubuntu-latest
+    steps:
+    - name: 'Calculate PR commits + 1'
+      run: echo "PR_FETCH_DEPTH=$(( ${{ github.event.pull_request.commits }} + 1 ))" >> $GITHUB_ENV
+    - uses: actions/checkout@v3
+      with:
+        ref: ${{ github.event.pull_request.head.sha }}
+        fetch-depth: ${{ env.PR_FETCH_DEPTH }}
+    - name: Copy checkpatch.conf
+      run: cp ${{github.workspace}}/.github/workflows/ci_checkpatch.conf ${{github.workspace}}/.checkpatch.conf
+    - name: Run checkpatch review
+      uses: webispy/checkpatch-action@v9

.github/workflows/ci_checkpatch.conf

@@ -0,0 +1,4 @@
+--no-tree
+--ignore FILE_PATH_CHANGES
+--ignore GIT_COMMIT_ID
+--ignore SPDX_LICENSE_TAG

.github/workflows/dtoverlaycheck.yml

@@ -0,0 +1,48 @@
+name: Pi dtoverlay checks
+
+on:
+  pull_request:
+    paths-ignore:
+      - '.github/**'
+    branches: [ "rpi-*" ]
+  push:
+    paths-ignore:
+      - '.github/**'
+    branches: [ "rpi-*" ]
+  workflow_dispatch:
+
+env:
+  UTILS_DIR: "${{github.workspace}}/utils"
+
+jobs:
+  dtoverlaycheck:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Install toolchain
+      run: |
+        sudo apt update
+        sudo apt-get install gcc-arm-linux-gnueabihf libfdt-dev device-tree-compiler
+      timeout-minutes: 10
+
+    - uses: actions/checkout@v4
+      with:
+        fetch-depth: 1
+        clean: true
+
+    - name: overlaycheck
+      run: |
+        git clone https://github.com/raspberrypi/utils ${{env.UTILS_DIR}}
+        cd ${{env.UTILS_DIR}}
+        pwd
+        mkdir build
+        cd build
+        pwd
+        cmake ..
+        make -j4
+        sudo make install
+        cd ${{github.workspace}}
+        pwd
+        make ARCH=arm KERNEL=kernel CROSS_COMPILE=arm-linux-gnueabihf- bcm2711_defconfig
+        make ARCH=arm KERNEL=kernel CROSS_COMPILE=arm-linux-gnueabihf- dtbs
+        ${{env.UTILS_DIR}}/overlaycheck/overlaycheck

.github/workflows/kernel-build.yml

@@ -0,0 +1,108 @@
+name: Pi kernel build tests
+
+on:
+  pull_request:
+    paths-ignore:
+      - '.github/**'
+    branches: [ "rpi-*" ]
+  push:
+    paths-ignore:
+      - '.github/**'
+    branches: [ "rpi-*" ]
+  workflow_dispatch:
+
+env:
+  NUM_JOBS: 3
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include:
+          - name: bcm2835
+            arch: arm
+            defconfig: bcm2835_defconfig
+            kernel: kernel
+
+          - name: arm64
+            arch: arm64
+            defconfig: defconfig
+            kernel: kernel8
+
+          - name: bcmrpi
+            arch: arm
+            defconfig: bcmrpi_defconfig
+            kernel: kernel
+
+          - name: bcm2709
+            arch: arm
+            defconfig: bcm2709_defconfig
+            kernel: kernel7
+
+          - name: bcm2711
+            arch: arm
+            defconfig: bcm2711_defconfig
+            kernel: kernel7l
+
+          - name: bcm2711_arm64
+            arch: arm64
+            defconfig: bcm2711_defconfig
+            kernel: kernel8
+
+          - name: bcm2712
+            arch: arm64
+            defconfig: bcm2712_defconfig
+            kernel: kernel_2712
+
+    steps:
+    - name: Update install
+      run:
+        sudo apt-get update
+
+    - name: Install toolchain
+      run:
+        if [[ "${{matrix.arch}}" == "arm64" ]]; then
+          sudo apt-get install gcc-aarch64-linux-gnu;
+        else
+          sudo apt-get install gcc-arm-linux-gnueabihf;
+        fi
+      timeout-minutes: 5
+
+    - uses: actions/checkout@v4
+      with:
+        fetch-depth: 1
+        clean: true
+
+    - name: Build kernel ${{matrix.name}}
+      run: |
+        mkdir ${{github.workspace}}/build
+        export ARCH=${{matrix.arch}}
+        if [[ "$ARCH" == "arm64" ]]; then
+          export CROSS_COMPILE=aarch64-linux-gnu-
+          export DTS_SUBDIR=broadcom
+          export IMAGE=Image.gz
+        else
+          export CROSS_COMPILE=arm-linux-gnueabihf-
+          export DTS_SUBDIR=broadcom
+          export IMAGE=zImage
+        fi
+        make O=${{github.workspace}}/build ${{matrix.defconfig}}
+        scripts/config --file ${{github.workspace}}/build/.config --set-val CONFIG_WERROR y
+        make O=${{github.workspace}}/build -j ${{env.NUM_JOBS}} $IMAGE modules dtbs
+        mkdir -p ${{github.workspace}}/install/boot/overlays
+        make O=${{github.workspace}}/build INSTALL_MOD_PATH=${{github.workspace}}/install modules_install
+        cp ${{github.workspace}}/build/arch/${ARCH}/boot/dts/${DTS_SUBDIR}/*.dtb ${{github.workspace}}/install/boot/
+        cp ${{github.workspace}}/build/arch/${ARCH}/boot/dts/overlays/*.dtb* ${{github.workspace}}/install/boot/overlays/
+        cp ${{github.workspace}}/arch/${ARCH}/boot/dts/overlays/README ${{github.workspace}}/install/boot/overlays/
+        cp ${{github.workspace}}/build/arch/${ARCH}/boot/$IMAGE ${{github.workspace}}/install/boot/${{matrix.kernel}}.img
+
+    - name: Tar build
+      run: tar -cvf ${{matrix.name}}_build.tar -C ${{github.workspace}}/install .
+
+    - name: Upload results
+      uses: actions/upload-artifact@v4
+      with:
+        name: ${{matrix.name}}_build
+        path: ${{matrix.name}}_build.tar
+        retention-days: 90

.github/workflows/kunit.yml

@@ -0,0 +1,57 @@
+name: KUnit Tests
+
+on:
+  pull_request:
+    branches: [ "rpi-*"]
+
+  push:
+    branches: [ "rpi-*"]
+
+jobs:
+  core:
+    name: Generic DRM/KMS Unit Tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Run Generic DRM Tests
+        run: |
+          echo Skipping ./tools/testing/kunit/kunit.py run \
+              --kunitconfig=drivers/gpu/drm/tests
+
+  vc4-arm:
+    name: VC4 Unit Tests on ARM
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y gcc-arm-linux-gnueabihf qemu-system-arm
+
+      - name: Run VC4 Tests
+        run: |
+          ./tools/testing/kunit/kunit.py run \
+              --kunitconfig=drivers/gpu/drm/vc4/tests \
+              --cross_compile=arm-linux-gnueabihf- --arch=arm
+
+  vc4-arm64:
+    name: VC4 Unit Tests on ARM64
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y gcc-aarch64-linux-gnu qemu-system-arm
+
+      - name: Run VC4 Tests
+        run: |
+          ./tools/testing/kunit/kunit.py run \
+              --kunitconfig=drivers/gpu/drm/vc4/tests \
+              --cross_compile=aarch64-linux-gnu- --arch=arm64