Added mesa role

roles/mesa/tasks/main.yml

@@ -0,0 +1,37 @@
+# community.general.pacman ignores the repo/pkg syntax, so call pacman.
+- name: Install the patched Mesa stack
+  become: true
+  ansible.builtin.command:
+    argv: "{{ ['pacman', '-S', '--noconfirm'] + (mesa_stack | map('regex_replace', '^', 'bc250-cachyos/') | list) }}"
+  register: mesa_install
+  changed_when: "'there is nothing to do' not in mesa_install.stdout"
+
+- name: Read the installed Mesa version
+  ansible.builtin.command: pacman -Q mesa
+  register: mesa_ver
+  changed_when: false
+
+# bc250-cachyos pkgrel carries a dot (1.67), the official one does not.
+- name: Verify the patched Mesa is the installed one
+  ansible.builtin.assert:
+    that: "'.' in mesa_ver.stdout.split('-')[-1]"
+    fail_msg: "Installed {{ mesa_ver.stdout }}: expected a bc250-cachyos pkgrel like 1.67."
+
+# The gfx103 patch is opt-in and off by default. Without this the device
+# stays GFX10.1 and mesh/task shaders are not exposed.
+- name: Enable the GFX10.3 promotion globally
+  become: true
+  ansible.builtin.lineinfile:
+    path: /etc/environment
+    regexp: '^RADV_GFX103='
+    line: 'RADV_GFX103=1'
+
+# Pin last: IgnorePkg outranks the repo/pkg syntax, so writing it before
+# the install would make pacman prompt instead of proceeding.
+- name: Pin the Mesa stack against upstream upgrades
+  become: true
+  ansible.builtin.lineinfile:
+    path: /etc/pacman.conf
+    regexp: '^IgnorePkg\s*='
+    line: "IgnorePkg = {{ mesa_stack | join(' ') }}"
+    insertafter: '^\[options\]'

roles/mesa/vars/main.yml

@@ -0,0 +1,9 @@
+mesa_stack:
+  - mesa
+  - opencl-mesa
+  - vulkan-radeon
+  - vulkan-mesa-implicit-layers
+  - lib32-mesa
+  - lib32-opencl-mesa
+  - lib32-vulkan-radeon
+  - lib32-vulkan-mesa-implicit-layers

site.yml

@@ -5,5 +5,9 @@
       role: kernel
     - name: Install fan control and temperature driver
       role: fan
+
+    # GPU stuff
     - name: Install GPU governor
       role: gpu_governor
+    - name: Install Mesa
+      role: mesa