tu+meson: Re-work KMD selection

Now that turnip can support multiple kernel-mode drivers in a single
build, re-work the meson option to have a single list of KMDs, rather
than special options to enable kgsl for turnip or virtio for gallium.

It is temporarily a bit awkward as gallium does not yet support kgsl
and turnip does not yet support virtio.  But both of those are planned
or in-progress, so long term a single list is the most sensible option.

TODO freedreno/drm support to build with only virtio support.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21394>

docs/android.rst

@@ -48,7 +48,7 @@ one cross-compiling the turnip driver for a stock Pixel phone)
 	-Dandroid-stub=true \
 	-Dgallium-drivers= \
 	-Dvulkan-drivers=freedreno \
-	-Dfreedreno-kgsl=true
+	-Dfreedreno-kmds=kgsl
     ninja -C build-android-aarch64
 
 Replacing Android drivers on stock Android

meson.build

@@ -131,11 +131,6 @@ with_shared_glapi = with_shared_glapi and with_any_opengl
 
 system_has_kms_drm = ['openbsd', 'netbsd', 'freebsd', 'gnu/kfreebsd', 'dragonfly', 'linux', 'sunos', 'android'].contains(host_machine.system())
 
-with_freedreno_kgsl = get_option('freedreno-kgsl')
-if with_freedreno_kgsl
-  system_has_kms_drm = false
-endif
-
 gallium_drivers = get_option('gallium-drivers')
 if gallium_drivers.contains('auto')
   if system_has_kms_drm
@@ -193,6 +188,13 @@ foreach gallium_driver : gallium_drivers
   pre_args += '-DHAVE_@0@'.format(gallium_driver.to_upper())
 endforeach
 
+freedreno_kmds = get_option('freedreno-kmds')
+# If building only vulkan with only kgsl kmd support, there is no libdrm
+# dependency:
+if freedreno_kmds.length() == 1 and freedreno_kmds.contains('kgsl') and not with_gallium_freedreno
+  system_has_kms_drm = false
+endif
+
 with_gallium = gallium_drivers.length() != 0
 with_gallium_kmsro = system_has_kms_drm and [
   with_gallium_asahi,
@@ -244,7 +246,6 @@ with_freedreno_vk = _vulkan_drivers.contains('freedreno')
 with_panfrost_vk = _vulkan_drivers.contains('panfrost')
 with_swrast_vk = _vulkan_drivers.contains('swrast')
 with_virtio_vk = _vulkan_drivers.contains('virtio-experimental')
-with_freedreno_virtio = get_option('freedreno-virtio')
 with_broadcom_vk = _vulkan_drivers.contains('broadcom')
 with_imagination_vk = _vulkan_drivers.contains('imagination-experimental')
 with_imagination_srv = get_option('imagination-srv')

meson_options.txt

@@ -198,19 +198,16 @@ option(
                 'will be built'
 )
 
+# Note that currently turnip supports msm and kgsl, while the gallium driver
+# support msm and virtio.  This is a temporary situation with virtio support
+# for turnip and kgsl support for gallium planned/in-progress.
 option(
-  'freedreno-kgsl',
+  'freedreno-kmds',
-  type : 'boolean',
+  type : 'array',
-  value : false,
+  value : ['msm'],
-  description : 'use kgsl backend for freedreno vulkan driver',
+  choices : ['msm', 'kgsl', 'virtio'],
-)
+  description : 'List of kernel-mode drivers to enable for freedreno ' +
-
+                'gallium and vulkan driver',
-option(
-  'freedreno-virtio',
-  type : 'boolean',
-  value : false,
-  description : 'use experimental virtio backend for freedreno (currently ' +
-                'only gallium driver)',
 )
 
 option(

src/freedreno/drm/meson.build

@@ -62,7 +62,7 @@ libfreedreno_drm_virtio_files = files(
   'virtio/virtio_ringbuffer.c',
   'virtio/virtio_ringbuffer.h',
 )
-if with_freedreno_virtio
+if freedreno_kmds.contains('virtio')
   libfreedreno_drm_files += libfreedreno_drm_virtio_files
   libfreedreno_drm_flags += '-DHAVE_FREEDRENO_VIRTIO'
   libfreedreno_drm_includes += inc_virtio_gpu

src/freedreno/vulkan/meson.build

@@ -67,12 +67,18 @@ if with_xlib_lease
   tu_deps += [dep_xlib_xrandr]
 endif
 
-if with_freedreno_kgsl
+if not system_has_kms_drm
-  tu_flags += '-DTU_USE_KGSL'
+  # Even if libdrm is available we shouldn't use it in KGSL-only build
-  # Even if libdrm is available we shouldn't use it in KGSL build
   tu_flags += '-UHAVE_LIBDRM'
+endif
+
+if freedreno_kmds.contains('kgsl')
+  tu_flags += '-DTU_HAS_KGSL'
   libtu_files += files('tu_knl_kgsl.c')
-else
+endif
+
+if freedreno_kmds.contains('msm')
+  tu_flags += '-DTU_HAS_MSM'
   libtu_files += files('tu_knl_drm_msm.c')
   tu_deps += dep_libdrm
 endif

src/freedreno/vulkan/tu_knl.c

@@ -119,7 +119,7 @@ tu_queue_submit(struct vk_queue *vk_queue, struct vk_queue_submit *submit)
 VkResult
 tu_enumerate_devices(struct vk_instance *vk_instance)
 {
-#ifdef TU_USE_KGSL
+#ifdef TU_HAS_KGSL
    struct tu_instance *instance =
       container_of(vk_instance, struct tu_instance, vk);
 
@@ -168,7 +168,6 @@ tu_physical_device_try_create(struct vk_instance *vk_instance,
 
    const char *primary_path = drm_device->nodes[DRM_NODE_PRIMARY];
    const char *path = drm_device->nodes[DRM_NODE_RENDER];
-   VkResult result = VK_SUCCESS;
    drmVersionPtr version;
    int fd;
    int master_fd = -1;
@@ -189,8 +188,11 @@ tu_physical_device_try_create(struct vk_instance *vk_instance,
 
    struct tu_physical_device *device = NULL;
 
+   VkResult result = VK_ERROR_INCOMPATIBLE_DRIVER;
    if (strcmp(version->name, "msm") == 0) {
+#ifdef TU_HAS_MSM
       result = tu_knl_drm_msm_load(instance, fd, version, &device);
+#endif
    } else {
       result = vk_startup_errorf(instance, VK_ERROR_INCOMPATIBLE_DRIVER,
                                  "device %s (%s) is not compatible with turnip",

src/freedreno/vulkan/tu_knl.h

@@ -46,9 +46,7 @@ struct tu_bo {
    const char *name; /* pointer to device->bo_sizes's entry's name */
    int32_t refcnt;
 
-#ifndef TU_USE_KGSL
    uint32_t bo_list_idx;
-#endif
 
    bool implicit_sync : 1;
 };
@@ -122,9 +120,7 @@ tu_bo_get_ref(struct tu_bo *bo)
    return bo;
 }
 
-#ifdef TU_USE_KGSL
 VkResult tu_knl_kgsl_load(struct tu_instance *instance, int fd);
-#endif
 
 struct _drmVersion;
 VkResult tu_knl_drm_msm_load(struct tu_instance *instance,

src/gallium/targets/dri/meson.build

@@ -110,7 +110,7 @@ foreach d : [[with_gallium_kmsro, [
              [with_gallium_r600, 'r600_dri.so'],
              [with_gallium_svga, 'vmwgfx_dri.so'],
              [with_gallium_virgl or
-               (with_gallium_freedreno and with_freedreno_virtio),
+               (with_gallium_freedreno and freedreno_kmds.contains('virtio')),
                'virtio_gpu_dri.so'],
              [with_gallium_lima, 'lima_dri.so'],
              [with_gallium_zink, 'zink_dri.so'],