intel: Fix some potential writes to zero-copy PBOs when used as regions.

I was in the midst of fixing some blitting-with-Y-tiled issues when I
noticed this.  Hopefully PBO usage will be a little more robust, as a
result.

src/mesa/drivers/dri/intel/intel_mipmap_tree.c

@@ -511,7 +511,7 @@ intel_miptree_image_copy(struct intel_context *intel,
                         0,
                         0,
                         src->region, src_offset + src_depth_offset[i],
-                        0, 0, width, height);
+                        0, 0, width, height, GL_COPY);
    }
 
 }

src/mesa/drivers/dri/intel/intel_pixel_copy.c

@@ -362,11 +362,9 @@ do_blit_copypixels(GLcontext * ctx,
 				   &clip_x, &clip_y, &clip_w, &clip_h))
             continue;
 
-         intelEmitCopyBlit(intel, dst->cpp,
-			   src->pitch, src->buffer, 0, src->tiling,
-			   dst->pitch, dst->buffer, 0, dst->tiling,
-			   clip_x + delta_x, clip_y + delta_y, /* srcx, srcy */
-			   clip_x, clip_y, /* dstx, dsty */
+	 intel_region_copy(intel,
+			   dst, 0, clip_x, clip_y,
+			   src, 0, clip_x + delta_x, clip_y + delta_y,
 			   clip_w, clip_h,
 			   ctx->Color.ColorLogicOpEnabled ?
 			   ctx->Color.LogicOp : GL_COPY);

src/mesa/drivers/dri/intel/intel_regions.c

@@ -367,7 +367,8 @@ intel_region_copy(struct intel_context *intel,
                   GLuint dstx, GLuint dsty,
                   struct intel_region *src,
                   GLuint src_offset,
-                  GLuint srcx, GLuint srcy, GLuint width, GLuint height)
+                  GLuint srcx, GLuint srcy, GLuint width, GLuint height,
+		  GLenum logicop)
 {
    _DBG("%s\n", __FUNCTION__);
 
@@ -389,7 +390,7 @@ intel_region_copy(struct intel_context *intel,
                      src->pitch, src->buffer, src_offset, src->tiling,
                      dst->pitch, dst->buffer, dst_offset, dst->tiling,
                      srcx, srcy, dstx, dsty, width, height,
-		     GL_COPY);
+		     logicop);
 }
 
 /* Attach to a pbo, discarding our data.  Effectively zero-copy upload

src/mesa/drivers/dri/intel/intel_regions.h

@@ -116,7 +116,8 @@ void intel_region_copy(struct intel_context *intel,
                        GLuint destx, GLuint desty,
                        struct intel_region *src,
                        GLuint src_offset,
-                       GLuint srcx, GLuint srcy, GLuint width, GLuint height);
+                       GLuint srcx, GLuint srcy, GLuint width, GLuint height,
+		       GLenum logicop);
 
 /* Helpers for zerocopy uploads, particularly texture image uploads:
  */

src/mesa/drivers/dri/intel/intel_tex_copy.c

@@ -107,6 +107,9 @@ do_copy_texsubimage(struct intel_context *intel,
    intelFlush(ctx);
    LOCK_HARDWARE(intel);
    {
+      drm_intel_bo *dst_bo = intel_region_buffer(intel,
+						 intelImage->mt->region,
+						 INTEL_WRITE_PART);
       GLuint image_offset = intel_miptree_image_offset(intelImage->mt,
                                                        intelImage->face,
                                                        intelImage->level);
@@ -151,7 +154,7 @@ do_copy_texsubimage(struct intel_context *intel,
 			0,
 			src->tiling,
 			intelImage->mt->pitch,
-			intelImage->mt->region->buffer,
+			dst_bo,
 			image_offset,
 			intelImage->mt->region->tiling,
 			x, y, dstx, dsty, width, height,