dix: add ability to link output slave gpus to the current gpu (v1.1)

Just add the interfaces to attach/detach output slaves, and
a linked list to keep track of them. Hook up the randr providers
list to include these slaves.

v1.1: add another assert to 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>

1 files changed, 7 insertions, 0 deletions

diff --git a/randr/rrprovider.c b/randr/rrprovider.c
index aae309501..377320032 100644
--- a/randr/rrprovider.c
+++ b/randr/rrprovider.c
@@ -72,6 +72,10 @@ ProcRRGetProviders (ClientPtr client)
 
     if (pScrPriv->provider)
         total_providers++;
+    xorg_list_for_each_entry(iter, &pScreen->output_slave_list, output_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;
@@ -105,6 +109,9 @@ ProcRRGetProviders (ClientPtr client)
 
         providers = (RRProvider *)extra;
         ADD_PROVIDER(pScreen);
+        xorg_list_for_each_entry(iter, &pScreen->output_slave_list, output_head) {
+            ADD_PROVIDER(iter);
+        }
         xorg_list_for_each_entry(iter, &pScreen->unattached_list, unattached_head) {
             ADD_PROVIDER(iter);
         }