st/va: add headless support, i.e. VA_DISPLAY_DRM

This patch allows to use gallium vaapi without requiring
a X server running for your second graphic card.

Signed-off-by: Julien Isorce <j.isorce@samsung.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Christian König <christian.koenig@amd.com>

src/gallium/state_trackers/va/Makefile.am

@@ -30,6 +30,15 @@ AM_CFLAGS = \
 	$(VA_CFLAGS) \
 	-DVA_DRIVER_INIT_FUNC="__vaDriverInit_$(VA_MAJOR)_$(VA_MINOR)"
 
+AM_CFLAGS += \
+	$(GALLIUM_PIPE_LOADER_DEFINES) \
+	-DPIPE_SEARCH_DIR=\"$(libdir)/gallium-pipe\"
+
+if HAVE_GALLIUM_STATIC_TARGETS
+AM_CFLAGS += \
+	-DGALLIUM_STATIC_TARGETS=1
+endif
+
 AM_CPPFLAGS = \
 	-I$(top_srcdir)/include
 

src/gallium/state_trackers/va/context.c

@@ -28,7 +28,8 @@
 
 #include "pipe/p_screen.h"
 #include "pipe/p_video_codec.h"
-
+#include "pipe-loader/pipe_loader.h"
+#include "state_tracker/drm_driver.h"
 #include "util/u_memory.h"
 #include "util/u_handle_table.h"
 #include "util/u_video.h"
@@ -36,6 +37,8 @@
 
 #include "va_private.h"
 
+#include <va/va_drmcommon.h>
+
 static struct VADriverVTable vtable =
 {
    &vlVaTerminate,
@@ -99,6 +102,8 @@ PUBLIC VAStatus
 VA_DRIVER_INIT_FUNC(VADriverContextP ctx)
 {
    vlVaDriver *drv;
+   int drm_fd;
+   struct drm_state *drm_info;
 
    if (!ctx)
       return VA_STATUS_ERROR_INVALID_CONTEXT;
@@ -107,9 +112,56 @@ VA_DRIVER_INIT_FUNC(VADriverContextP ctx)
    if (!drv)
       return VA_STATUS_ERROR_ALLOCATION_FAILED;
 
-   drv->vscreen = vl_screen_create(ctx->native_dpy, ctx->x11_screen);
+   switch (ctx->display_type) {
-   if (!drv->vscreen)
+   case VA_DISPLAY_ANDROID:
-      goto error_screen;
+   case VA_DISPLAY_WAYLAND:
+      FREE(drv);
+      return VA_STATUS_ERROR_UNIMPLEMENTED;
+   case VA_DISPLAY_GLX:
+   case VA_DISPLAY_X11:
+      drv->vscreen = vl_screen_create(ctx->native_dpy, ctx->x11_screen);
+      if (!drv->vscreen)
+         goto error_screen;
+      break;
+   case VA_DISPLAY_DRM:
+   case VA_DISPLAY_DRM_RENDERNODES: {
+      drm_info = (struct drm_state *) ctx->drm_state;
+      if (!drm_info) {
+         FREE(drv);
+         return VA_STATUS_ERROR_INVALID_PARAMETER;
+      }
+
+#if GALLIUM_STATIC_TARGETS
+      drm_fd = drm_info->fd;
+#else
+      drm_fd = dup(drm_info->fd);
+#endif
+
+      if (drm_fd < 0) {
+         FREE(drv);
+         return VA_STATUS_ERROR_INVALID_PARAMETER;
+      }
+
+      drv->vscreen = CALLOC_STRUCT(vl_screen);
+      if (!drv->vscreen)
+         goto error_screen;
+
+#if GALLIUM_STATIC_TARGETS
+      drv->vscreen->pscreen = dd_create_screen(drm_fd);
+#else
+      if (pipe_loader_drm_probe_fd(&drv->dev, drm_fd))
+         drv->vscreen->pscreen = pipe_loader_create_screen(drv->dev, PIPE_SEARCH_DIR);
+#endif
+
+      if (!drv->vscreen->pscreen)
+         goto error_pipe;
+
+      }
+      break;
+   default:
+      FREE(drv);
+      return VA_STATUS_ERROR_INVALID_DISPLAY;
+   }
 
    drv->pipe = drv->vscreen->pscreen->context_create(drv->vscreen->pscreen,
                                                      drv->vscreen, 0);
@@ -145,7 +197,10 @@ error_htab:
    drv->pipe->destroy(drv->pipe);
 
 error_pipe:
-   vl_screen_destroy(drv->vscreen);
+   if (ctx->display_type == VA_DISPLAY_GLX || ctx->display_type == VA_DISPLAY_X11)
+      vl_screen_destroy(drv->vscreen);
+   else
+      FREE(drv->vscreen);
 
 error_screen:
    FREE(drv);
@@ -282,7 +337,10 @@ vlVaTerminate(VADriverContextP ctx)
    vl_compositor_cleanup_state(&drv->cstate);
    vl_compositor_cleanup(&drv->compositor);
    drv->pipe->destroy(drv->pipe);
-   vl_screen_destroy(drv->vscreen);
+   if (ctx->display_type == VA_DISPLAY_GLX || ctx->display_type == VA_DISPLAY_X11)
+      vl_screen_destroy(drv->vscreen);
+   else
+      FREE(drv->vscreen);
    handle_table_destroy(drv->htab);
    FREE(drv);