kmsro: wire Zink up as a fallback

As Zink has gained support for renderonly devices, wire it up to KMSRO
to allow such kind of usage.

Among all renderonly drivers, Zink is a little special that it does not
bind to a specific driver name, so it's made a fallback option which is
checked after all driver name checks.

Signed-off-by: Frank Binns <frank.binns@imgtec.com>
[Icenowy: split patch, forward port, de-hardcode "powervr"]

Signed-off-by: Icenowy Zheng <uwu@icenowy.me>
Signed-off-by: Icenowy Zheng <zhengxingda@iscas.ac.cn>
Reviewed-By: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38810>

src/gallium/auxiliary/pipe-loader/meson.build

@@ -45,6 +45,9 @@ endif
 if with_gallium_ethosu
   renderonly_drivers_c_args += '-DGALLIUM_ETHOSU'
 endif
+if with_gallium_zink
+  renderonly_drivers_c_args += '-DGALLIUM_ZINK'
+endif
 
 libpipe_loader_static = static_library(
   'pipe_loader_static',

src/gallium/auxiliary/pipe-loader/pipe_loader_drm.c

@@ -388,6 +388,9 @@ pipe_loader_get_compatible_render_capable_device_fds(int kms_only_fd, unsigned i
 #endif
 #if defined GALLIUM_VC4
       "vc4",
+#endif
+#if defined GALLIUM_ZINK
+      "zink",
 #endif
    };
 

src/gallium/auxiliary/target-helpers/drm_helper.h

@@ -509,6 +509,9 @@ const driOptionDescription kmsro_driconf[] = {
 #ifdef GALLIUM_LIMA
       #include "lima/driinfo_lima.h"
 #endif
+#ifdef GALLIUM_ZINK
+      #include "zink/driinfo_zink.h"
+#endif
 };
 DRM_DRIVER_DESCRIPTOR(kmsro, kmsro_driconf, ARRAY_SIZE(kmsro_driconf))
 

src/gallium/winsys/kmsro/drm/kmsro_drm_winsys.c

@@ -33,6 +33,7 @@
 #include "panfrost/drm/panfrost_drm_public.h"
 #include "lima/drm/lima_drm_public.h"
 #include "asahi/drm/asahi_drm_public.h"
+#include "zink/drm/zink_drm_public.h"
 #include "xf86drm.h"
 
 #include "pipe/p_screen.h"
@@ -130,6 +131,13 @@ struct pipe_screen *kmsro_drm_screen_create(int kms_fd,
 
       free(render_dev_name);
 
+#if defined(GALLIUM_ZINK)
+      if (!screen) {
+         ro->create_for_resource = renderonly_create_kms_dumb_buffer_for_resource;
+         screen = zink_drm_create_screen_renderonly(ro->gpu_fd, ro, config);
+      }
+#endif
+
       /* test if the screen is actually graphics render capable */
       if (screen) {
          if (screen->caps.graphics)

src/loader/loader.c

@@ -264,7 +264,9 @@ loader_open_render_node_platform_devices(const char * const drivers[],
          }
 
          for (j = 0; j < n_drivers; j++) {
-            if (strcmp(version->name, drivers[j]) == 0) {
+            /* Always try to open the render device with Zink if requested */
+            if (strcmp("zink", drivers[j]) == 0 ||
+                strcmp(version->name, drivers[j]) == 0) {
                found = true;
                break;
             }