nv2a: Block renderer finalization on display present

hw/xbox/nv2a/nv2a.h

@@ -24,6 +24,7 @@
 void nv2a_init(PCIBus *bus, int devfn, MemoryRegion *ram);
 void nv2a_context_init(void);
 int nv2a_get_framebuffer_surface(void);
+void nv2a_release_framebuffer_surface(void);
 void nv2a_set_surface_scale_factor(unsigned int scale);
 unsigned int nv2a_get_surface_scale_factor(void);
 const uint8_t *nv2a_get_dac_palette(void);

hw/xbox/nv2a/pgraph/gl/surface.c

@@ -39,8 +39,6 @@ void pgraph_gl_set_surface_scale_factor(NV2AState *d, unsigned int scale)
 
     g_config.display.quality.surface_scale = scale < 1 ? 1 : scale;
 
-    qemu_mutex_unlock_iothread();
-
     qemu_mutex_lock(&d->pfifo.lock);
     qatomic_set(&d->pfifo.halt, true);
     qemu_mutex_unlock(&d->pfifo.lock);
@@ -67,8 +65,6 @@ void pgraph_gl_set_surface_scale_factor(NV2AState *d, unsigned int scale)
     qatomic_set(&d->pfifo.halt, false);
     pfifo_kick(d);
     qemu_mutex_unlock(&d->pfifo.lock);
-
-    qemu_mutex_lock_iothread();
 }
 
 unsigned int pgraph_gl_get_surface_scale_factor(NV2AState *d)

hw/xbox/nv2a/pgraph/pgraph.c

@@ -222,6 +222,7 @@ void pgraph_init(NV2AState *d)
     qemu_mutex_init(&pg->renderer_lock);
     qemu_event_init(&pg->sync_complete, false);
     qemu_event_init(&pg->flush_complete, false);
+    qemu_cond_init(&pg->framebuffer_released);
 
     pg->frame_time = 0;
     pg->draw_time = 0;
@@ -352,38 +353,55 @@ void pgraph_destroy(PGRAPHState *pg)
 int nv2a_get_framebuffer_surface(void)
 {
     NV2AState *d = g_nv2a;
+    PGRAPHState *pg = &d->pgraph;
     int s = 0;
 
-    qemu_mutex_lock(&d->pgraph.renderer_lock);
-    if (d->pgraph.renderer->ops.get_framebuffer_surface) {
-        s = d->pgraph.renderer->ops.get_framebuffer_surface(d);
+    qemu_mutex_lock(&pg->renderer_lock);
+    assert(!pg->framebuffer_in_use);
+    pg->framebuffer_in_use = true;
+    if (pg->renderer->ops.get_framebuffer_surface) {
+        s = pg->renderer->ops.get_framebuffer_surface(d);
     }
-    qemu_mutex_unlock(&d->pgraph.renderer_lock);
+    qemu_mutex_unlock(&pg->renderer_lock);
 
     return s;
 }
 
+void nv2a_release_framebuffer_surface(void)
+{
+    NV2AState *d = g_nv2a;
+    PGRAPHState *pg = &d->pgraph;
+    qemu_mutex_lock(&pg->renderer_lock);
+    pg->framebuffer_in_use = false;
+    qemu_cond_broadcast(&pg->framebuffer_released);
+    qemu_mutex_unlock(&pg->renderer_lock);
+}
+
 void nv2a_set_surface_scale_factor(unsigned int scale)
 {
     NV2AState *d = g_nv2a;
 
+    qemu_mutex_unlock_iothread();
     qemu_mutex_lock(&d->pgraph.renderer_lock);
     if (d->pgraph.renderer->ops.set_surface_scale_factor) {
         d->pgraph.renderer->ops.set_surface_scale_factor(d, scale);
     }
     qemu_mutex_unlock(&d->pgraph.renderer_lock);
+    qemu_mutex_lock_iothread();
 }
 
 unsigned int nv2a_get_surface_scale_factor(void)
 {
     NV2AState *d = g_nv2a;
     int s = 1;
 
+    qemu_mutex_unlock_iothread();
     qemu_mutex_lock(&d->pgraph.renderer_lock);
     if (d->pgraph.renderer->ops.get_surface_scale_factor) {
         s = d->pgraph.renderer->ops.get_surface_scale_factor(d);
     }
     qemu_mutex_unlock(&d->pgraph.renderer_lock);
+    qemu_mutex_lock_iothread();
 
     return s;
 }
@@ -2958,6 +2976,9 @@ void pgraph_process_pending(NV2AState *d)
 
             qemu_mutex_unlock(&d->pfifo.lock);
             qemu_mutex_lock(&d->pgraph.lock);
+            while (pg->framebuffer_in_use) {
+                qemu_cond_wait(&d->pgraph.framebuffer_released, &d->pgraph.renderer_lock);
+            }
 
             if (pg->renderer->ops.finalize) {
                 pg->renderer->ops.finalize(d);

hw/xbox/nv2a/pgraph/pgraph.h

@@ -235,6 +235,9 @@ typedef struct PGRAPHState {
     bool sync_pending;
     QemuEvent sync_complete;
 
+    bool framebuffer_in_use;
+    QemuCond framebuffer_released;
+
     unsigned int surface_scale_factor;
     uint8_t *scale_buf;
 

hw/xbox/nv2a/pgraph/vk/surface.c

@@ -36,8 +36,6 @@ void pgraph_vk_set_surface_scale_factor(NV2AState *d, unsigned int scale)
 {
     g_config.display.quality.surface_scale = scale < 1 ? 1 : scale;
 
-    qemu_mutex_unlock_iothread();
-
     qemu_mutex_lock(&d->pfifo.lock);
     qatomic_set(&d->pfifo.halt, true);
     qemu_mutex_unlock(&d->pfifo.lock);
@@ -65,8 +63,6 @@ void pgraph_vk_set_surface_scale_factor(NV2AState *d, unsigned int scale)
     qatomic_set(&d->pfifo.halt, false);
     pfifo_kick(d);
     qemu_mutex_unlock(&d->pfifo.lock);
-
-    qemu_mutex_lock_iothread();
 }
 
 unsigned int pgraph_vk_get_surface_scale_factor(NV2AState *d)

ui/xemu.c

@@ -1209,6 +1209,7 @@ void sdl2_gl_refresh(DisplayChangeListener *dcl)
     qemu_mutex_unlock_main_loop();
 
     glFinish();
+    nv2a_release_framebuffer_surface();
     SDL_GL_SwapWindow(scon->real_window);
 
     /* VGA update (see note above) + vblank */