drm/nv50-nvc0: completely disable relocs

GPU virtual addresses are constant now so this should never be getting hit
anyway and userspace shouldn't break from them being ignored.

This is being done in preference to teaching the code how to deal with BOs
that exist at different virtual addresses within separate VMs.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_gem.c

@@ -333,6 +333,7 @@ static int
 validate_list(struct nouveau_channel *chan, struct list_head *list,
 	      struct drm_nouveau_gem_pushbuf_bo *pbbo, uint64_t user_pbbo_ptr)
 {
+	struct drm_nouveau_private *dev_priv = chan->dev->dev_private;
 	struct drm_nouveau_gem_pushbuf_bo __user *upbbo =
 				(void __force __user *)(uintptr_t)user_pbbo_ptr;
 	struct drm_device *dev = chan->dev;
@@ -371,24 +372,26 @@ validate_list(struct nouveau_channel *chan, struct list_head *list,
 			return ret;
 		}
 
-		if (nvbo->bo.offset == b->presumed.offset &&
-		    ((nvbo->bo.mem.mem_type == TTM_PL_VRAM &&
-		      b->presumed.domain & NOUVEAU_GEM_DOMAIN_VRAM) ||
-		     (nvbo->bo.mem.mem_type == TTM_PL_TT &&
-		      b->presumed.domain & NOUVEAU_GEM_DOMAIN_GART)))
-			continue;
+		if (dev_priv->card_type < NV_50) {
+			if (nvbo->bo.offset == b->presumed.offset &&
+			    ((nvbo->bo.mem.mem_type == TTM_PL_VRAM &&
+			      b->presumed.domain & NOUVEAU_GEM_DOMAIN_VRAM) ||
+			     (nvbo->bo.mem.mem_type == TTM_PL_TT &&
+			      b->presumed.domain & NOUVEAU_GEM_DOMAIN_GART)))
+				continue;
 
-		if (nvbo->bo.mem.mem_type == TTM_PL_TT)
-			b->presumed.domain = NOUVEAU_GEM_DOMAIN_GART;
-		else
-			b->presumed.domain = NOUVEAU_GEM_DOMAIN_VRAM;
-		b->presumed.offset = nvbo->bo.offset;
-		b->presumed.valid = 0;
-		relocs++;
-
-		if (DRM_COPY_TO_USER(&upbbo[nvbo->pbbo_index].presumed,
-				     &b->presumed, sizeof(b->presumed)))
-			return -EFAULT;
+			if (nvbo->bo.mem.mem_type == TTM_PL_TT)
+				b->presumed.domain = NOUVEAU_GEM_DOMAIN_GART;
+			else
+				b->presumed.domain = NOUVEAU_GEM_DOMAIN_VRAM;
+			b->presumed.offset = nvbo->bo.offset;
+			b->presumed.valid = 0;
+			relocs++;
+
+			if (DRM_COPY_TO_USER(&upbbo[nvbo->pbbo_index].presumed,
+					     &b->presumed, sizeof(b->presumed)))
+				return -EFAULT;
+		}
 	}
 
 	return relocs;