autobind GPUs to the screen, (v3)server-1.18-branch

this is racy and really not what we want for hotplug going forward,
but until DE support is in GNOME its probably for the best.

v2: fix if config or slave config is NULL
v3: fix multi useful slaves
DO NOT UPSTREAM.

Signed-off-by: Dave Airlie <airlied@gmail.com>

3 files changed, 47 insertions, 0 deletions

diff --git a/hw/xfree86/common/xf86Init.c b/hw/xfree86/common/xf86Init.c
index 9bade905d..6b97d24ec 100644
--- a/hw/xfree86/common/xf86Init.c
+++ b/hw/xfree86/common/xf86Init.c
@@ -341,6 +341,16 @@ xf86CreateRootWindow(WindowPtr pWin)
     return ret;
 }
 
+extern void xf86AutoConfigOutputDevice(ScrnInfoPtr pScrn, ScrnInfoPtr master);                              
+static void
+xf86AutoConfigOutputDevices(void)
+{
+    int i;
+
+    for (i = 0; i < xf86NumGPUScreens; i++)
+        xf86AutoConfigOutputDevice(xf86GPUScreens[i], xf86Screens[0]);
+}
+
 static void
 InstallSignalHandlers(void)
 {
@@ -930,6 +940,8 @@ InitOutput(ScreenInfo * pScreenInfo, int argc, char **argv)
     for (i = 0; i < xf86NumGPUScreens; i++)
         AttachUnboundGPU(xf86Screens[0]->pScreen, xf86GPUScreens[i]->pScreen);
 
+    xf86AutoConfigOutputDevices();
+
     xf86VGAarbiterWrapFunctions();
     if (sigio_blocked)
         OsReleaseSIGIO();
diff --git a/hw/xfree86/common/xf86platformBus.c b/hw/xfree86/common/xf86platformBus.c
index 96895a6e1..8b3a8623d 100644
--- a/hw/xfree86/common/xf86platformBus.c
+++ b/hw/xfree86/common/xf86platformBus.c
@@ -469,6 +469,8 @@ xf86platformProbeDev(DriverPtr drvp)
     return foundScreen;
 }
 
+extern void xf86AutoConfigOutputDevice(ScrnInfoPtr pScrn, ScrnInfoPtr master);
+
 int
 xf86platformAddDevice(int index)
 {
@@ -540,6 +542,7 @@ xf86platformAddDevice(int index)
    }
    /* attach unbound to 0 protocol screen */
    AttachUnboundGPU(xf86Screens[0]->pScreen, xf86GPUScreens[i]->pScreen);
+   xf86AutoConfigOutputDevice(xf86GPUScreens[i], xf86Screens[0]);
 
    RRResourcesChanged(xf86Screens[0]->pScreen);
    RRTellChanged(xf86Screens[0]->pScreen);
diff --git a/hw/xfree86/modes/xf86Crtc.c b/hw/xfree86/modes/xf86Crtc.c
index 4a13c1329..e7a2f1d93 100644
--- a/hw/xfree86/modes/xf86Crtc.c
+++ b/hw/xfree86/modes/xf86Crtc.c
@@ -3575,3 +3575,35 @@ xf86DetachAllCrtc(ScrnInfoPtr scrn)
             crtc->x = crtc->y = 0;
         }
 }
+
+
+void xf86AutoConfigOutputDevice(ScrnInfoPtr pScrn, ScrnInfoPtr master)
+{
+    RRProviderPtr master_provider;
+    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(master);
+    xf86CrtcConfigPtr slave_config = XF86_CRTC_CONFIG_PTR(pScrn);
+    Bool unbound = FALSE;
+
+    if (!config || !slave_config)
+        return;
+
+    master_provider = config->randr_provider;
+
+    if ((master->capabilities & RR_Capability_SinkOffload) &&
+        pScrn->capabilities & RR_Capability_SourceOffload) {
+            /* source offload */
+            
+        DetachUnboundGPU(pScrn->pScreen);
+        unbound = TRUE;
+        AttachOffloadGPU(master->pScreen, pScrn->pScreen);
+        slave_config->randr_provider->offload_sink = master_provider;
+    }
+    if ((master->capabilities & RR_Capability_SourceOutput) &&
+               pScrn->capabilities & RR_Capability_SinkOutput) {
+        /* sink offload */
+        if (!unbound)
+            DetachUnboundGPU(pScrn->pScreen);
+        AttachOutputGPU(master->pScreen, pScrn->pScreen);
+        slave_config->randr_provider->output_source = master_provider;
+    }
+}