intel: Add a function for setting (GTT,GTT) domain, for use by UXA.

This function can also serve the role that the bo_wait_rendering did, when
write_enable is unset.

2 files changed, 16 insertions, 1 deletions

diff --git a/libdrm/intel/intel_bufmgr.h b/libdrm/intel/intel_bufmgr.h
index 361e4345..f134f169 100644
--- a/libdrm/intel/intel_bufmgr.h
+++ b/libdrm/intel/intel_bufmgr.h
@@ -106,6 +106,7 @@ drm_intel_bo *drm_intel_bo_gem_create_from_name(drm_intel_bufmgr *bufmgr,
 						unsigned int handle);
 void drm_intel_bufmgr_gem_enable_reuse(drm_intel_bufmgr *bufmgr);
 int drm_intel_gem_bo_map_gtt(drm_intel_bo *bo);
+void drm_intel_gem_bo_start_gtt_access(drm_intel_bo *bo, int write_enable);
 
 /* drm_intel_bufmgr_fake.c */
 drm_intel_bufmgr *drm_intel_bufmgr_fake_init(int fd,
diff --git a/libdrm/intel/intel_bufmgr_gem.c b/libdrm/intel/intel_bufmgr_gem.c
index be41474b..e681eee7 100644
--- a/libdrm/intel/intel_bufmgr_gem.c
+++ b/libdrm/intel/intel_bufmgr_gem.c
@@ -729,9 +729,23 @@ drm_intel_gem_bo_get_subdata (drm_intel_bo *bo, unsigned long offset,
     return 0;
 }
 
+/** Waits for all GPU rendering to the object to have completed. */
 static void
 drm_intel_gem_bo_wait_rendering(drm_intel_bo *bo)
 {
+    return drm_intel_gem_bo_start_gtt_access(bo, 0);
+}
+
+/**
+ * Sets the object to the GTT read and possibly write domain, used by the X
+ * 2D driver in the absence of kernel support to do drm_intel_gem_bo_map_gtt().
+ *
+ * In combination with drm_intel_gem_bo_pin() and manual fence management, we
+ * can do tiled pixmaps this way.
+ */
+void
+drm_intel_gem_bo_start_gtt_access(drm_intel_bo *bo, int write_enable)
+{
     drm_intel_bufmgr_gem *bufmgr_gem = (drm_intel_bufmgr_gem *)bo->bufmgr;
     drm_intel_bo_gem *bo_gem = (drm_intel_bo_gem *)bo;
     struct drm_i915_gem_set_domain set_domain;
@@ -739,7 +753,7 @@ drm_intel_gem_bo_wait_rendering(drm_intel_bo *bo)
 
     set_domain.handle = bo_gem->gem_handle;
     set_domain.read_domains = I915_GEM_DOMAIN_GTT;
-    set_domain.write_domain = 0;
+    set_domain.write_domain = write_enable ? I915_GEM_DOMAIN_GTT : 0;
     do {
 	ret = ioctl(bufmgr_gem->fd, DRM_IOCTL_I915_GEM_SET_DOMAIN, &set_domain);
     } while (ret == -1 && errno == EINTR);