From 3216e0c618cc330f053ed36a749c8d8cfeb87a2f Mon Sep 17 00:00:00 2001
From: Dave Airlie <airlied@redhat.com>
Date: Fri, 17 Aug 2012 09:49:24 +1000
Subject: [PATCH] autobind GPUs to the screen, (v3)

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>
---
 hw/xfree86/common/xf86Init.c        | 12 ++++++++++++
 hw/xfree86/common/xf86platformBus.c |  3 +++
 hw/xfree86/modes/xf86Crtc.c         | 32 ++++++++++++++++++++++++++++++++
 3 files changed, 47 insertions(+)

diff --git a/hw/xfree86/common/xf86Init.c b/hw/xfree86/common/xf86Init.c
index 1e95061..c58fd2b 100644
--- a/hw/xfree86/common/xf86Init.c
+++ b/hw/xfree86/common/xf86Init.c
@@ -361,6 +361,16 @@ 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)
 {
@@ -931,6 +941,8 @@ 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 33b2b7d..be3bdd9 100644
--- a/hw/xfree86/common/xf86platformBus.c
+++ b/hw/xfree86/common/xf86platformBus.c
@@ -393,6 +393,8 @@ xf86platformProbeDev(DriverPtr drvp)
     return foundScreen;
 }
 
+extern void xf86AutoConfigOutputDevice(ScrnInfoPtr pScrn, ScrnInfoPtr master);
+
 int
 xf86platformAddDevice(int index)
 {
@@ -465,6 +467,7 @@ 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 a441fd1..c1a56a5 100644
--- a/hw/xfree86/modes/xf86Crtc.c
+++ b/hw/xfree86/modes/xf86Crtc.c
@@ -3383,3 +3383,35 @@ 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;
+    }
+}
-- 
1.8.4.5