dix/xf86: initial offload slave tracking (v1.1)

add the linked list and provider hooks.

v1.1: add another assert in the add path.
Reviewed-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

dix/dispatch.c

@@ -3745,6 +3745,7 @@ static int init_screen(ScreenPtr pScreen, int i, Bool gpu)
     xorg_list_init(&pScreen->pixmap_dirty_list);
     xorg_list_init(&pScreen->unattached_list);
     xorg_list_init(&pScreen->output_slave_list);
+    xorg_list_init(&pScreen->offload_slave_list);
 
     /*
      * This loop gets run once for every Screen that gets added,
@@ -3927,3 +3928,21 @@ DetachOutputGPU(ScreenPtr slave)
     xorg_list_del(&slave->output_head);
     slave->current_master = NULL;
 }
+
+void
+AttachOffloadGPU(ScreenPtr pScreen, ScreenPtr new)
+{
+    assert(new->isGPU);
+    assert(!new->current_master);
+    xorg_list_add(&new->offload_head, &pScreen->offload_slave_list);
+    new->current_master = pScreen;
+}
+
+void
+DetachOffloadGPU(ScreenPtr slave)
+{
+    assert(slave->isGPU);
+    xorg_list_del(&slave->offload_head);
+    slave->current_master = NULL;
+}
+

include/screenint.h

@@ -82,6 +82,12 @@ AttachOutputGPU(ScreenPtr pScreen, ScreenPtr new);
 extern _X_EXPORT void
 DetachOutputGPU(ScreenPtr output);
 
+extern _X_EXPORT void
+AttachOffloadGPU(ScreenPtr pScreen, ScreenPtr new);
+
+extern _X_EXPORT void
+DetachOffloadGPU(ScreenPtr slave);
+
 typedef struct _ColormapRec *ColormapPtr;
 
 #endif                          /* SCREENINT_H */

include/scrnintstr.h

@@ -507,6 +507,9 @@ typedef struct _Screen {
     StopPixmapTrackingProcPtr StopPixmapTracking;
 
     struct xorg_list pixmap_dirty_list;
+    struct xorg_list offload_slave_list;
+    struct xorg_list offload_head;
+
 } ScreenRec;
 
 static inline RegionPtr

randr/rrprovider.c

@@ -76,6 +76,10 @@ ProcRRGetProviders (ClientPtr client)
         pScrPriv = rrGetScrPriv(iter);
         total_providers += pScrPriv->provider ? 1 : 0;
     }
+    xorg_list_for_each_entry(iter, &pScreen->offload_slave_list, offload_head) {
+        pScrPriv = rrGetScrPriv(iter);
+        total_providers += pScrPriv->provider ? 1 : 0;
+    }
     xorg_list_for_each_entry(iter, &pScreen->unattached_list, unattached_head) {
         pScrPriv = rrGetScrPriv(iter);
         total_providers += pScrPriv->provider ? 1 : 0;
@@ -112,6 +116,9 @@ ProcRRGetProviders (ClientPtr client)
         xorg_list_for_each_entry(iter, &pScreen->output_slave_list, output_head) {
             ADD_PROVIDER(iter);
         }
+        xorg_list_for_each_entry(iter, &pScreen->offload_slave_list, offload_head) {
+            ADD_PROVIDER(iter);
+        }
         xorg_list_for_each_entry(iter, &pScreen->unattached_list, unattached_head) {
             ADD_PROVIDER(iter);
         }