rusticl/mesa: wire up fence_server

We need this to wait on imported fences.

Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36249>
(cherry picked from commit 8617cf46d6)

.pick_status.json

@@ -3024,7 +3024,7 @@
         "description": "rusticl/mesa: wire up fence_server",
         "nominated": true,
         "nomination_type": 1,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": null,
         "notes": null

src/gallium/frontends/rusticl/mesa/pipe/context.rs

@@ -629,6 +629,11 @@ impl PipeContext {
             }
         }
     }
+
+    pub fn has_fence_server(&self) -> bool {
+        let pipe = unsafe { self.pipe().as_ref() };
+        pipe.fence_server_signal.is_some() && pipe.fence_server_sync.is_some()
+    }
 }
 
 impl Drop for PipeContext {

src/gallium/frontends/rusticl/mesa/pipe/fence.rs

@@ -1,4 +1,4 @@
-use crate::pipe::screen::*;
+use crate::pipe::{context::PipeContext, screen::*};
 
 use libc_rust_gen::close;
 use mesa_rust_gen::*;
@@ -30,6 +30,20 @@ impl PipeFence {
         }
     }
 
+    pub fn gpu_signal(&self, ctx: &PipeContext) {
+        debug_assert!(ctx.has_fence_server());
+        unsafe {
+            ctx.pipe().as_ref().fence_server_signal.unwrap()(ctx.pipe().as_ptr(), self.fence);
+        }
+    }
+
+    pub fn gpu_wait(&self, ctx: &PipeContext) {
+        debug_assert!(ctx.has_fence_server());
+        unsafe {
+            ctx.pipe().as_ref().fence_server_sync.unwrap()(ctx.pipe().as_ptr(), self.fence);
+        }
+    }
+
     pub fn wait(&self) {
         self.screen.fence_finish(self.fence);
     }