i915: Tell the kernel when we actually need fence registers on our BOs.

This improves tiled texture performance of OA on my 945 from 25.3fps
to 29.0fps, whereas untiled is 28.2fps, by avoiding stalls for fence
register changes.

1 files changed, 25 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/intel/intel_batchbuffer.c b/src/mesa/drivers/dri/intel/intel_batchbuffer.c
index e38f10ebc6..a7bfd62b28 100644
--- a/src/mesa/drivers/dri/intel/intel_batchbuffer.c
+++ b/src/mesa/drivers/dri/intel/intel_batchbuffer.c
@@ -226,6 +226,31 @@ intel_batchbuffer_emit_reloc(struct intel_batchbuffer *batch,
    return GL_TRUE;
 }
 
+GLboolean
+intel_batchbuffer_emit_reloc_fenced(struct intel_batchbuffer *batch,
+				    drm_intel_bo *buffer,
+				    uint32_t read_domains, uint32_t write_domain,
+				    uint32_t delta)
+{
+   int ret;
+
+   if (batch->ptr - batch->map > batch->buf->size)
+    printf ("bad relocation ptr %p map %p offset %d size %lu\n",
+	    batch->ptr, batch->map, batch->ptr - batch->map, batch->buf->size);
+   ret = drm_intel_bo_emit_reloc_fence(batch->buf, batch->ptr - batch->map,
+				       buffer, delta,
+				       read_domains, write_domain);
+
+   /*
+    * Using the old buffer offset, write in what the right data would
+    * be, in case the buffer doesn't move and we can short-circuit the
+    * relocation processing in the kernel
+    */
+   intel_batchbuffer_emit_dword (batch, buffer->offset + delta);
+
+   return GL_TRUE;
+}
+
 void
 intel_batchbuffer_data(struct intel_batchbuffer *batch,
                        const void *data, GLuint bytes)