i965: Explicitly disallow tiled memcpy path on Gen4 with swizzling.

The manual detiling paths are not prepared to handle Gen4-G45 with
swizzling enabled, so explicitly disable them.  (They're already
disabled because these platforms don't have LLC but a future patch could
enable this path).

Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Kenneth Graunke <kenneth@whitecape.org>

src/mesa/drivers/dri/i965/intel_pixel_read.c

@@ -133,6 +133,17 @@ intel_readpixels_tiled_memcpy(struct gl_context * ctx,
       return false;
    }
 
+   /* tiled_to_linear() assumes that if the object is swizzled, it is using
+    * I915_BIT6_SWIZZLE_9_10 for X and I915_BIT6_SWIZZLE_9 for Y.  This is only
+    * true on gen5 and above.
+    *
+    * The killer on top is that some gen4 have an L-shaped swizzle mode, where
+    * parts of the memory aren't swizzled at all. Userspace just can't handle
+    * that.
+    */
+   if (brw->gen < 5 && brw->has_swizzling)
+      return false;
+
    /* Since we are going to read raw data to the miptree, we need to resolve
     * any pending fast color clears before we start.
     */

src/mesa/drivers/dri/i965/intel_tex_image.c

@@ -522,6 +522,17 @@ intel_gettexsubimage_tiled_memcpy(struct gl_context *ctx,
       return false;
    }
 
+   /* tiled_to_linear() assumes that if the object is swizzled, it is using
+    * I915_BIT6_SWIZZLE_9_10 for X and I915_BIT6_SWIZZLE_9 for Y.  This is only
+    * true on gen5 and above.
+    *
+    * The killer on top is that some gen4 have an L-shaped swizzle mode, where
+    * parts of the memory aren't swizzled at all. Userspace just can't handle
+    * that.
+    */
+   if (brw->gen < 5 && brw->has_swizzling)
+      return false;
+
    /* Since we are going to write raw data to the miptree, we need to resolve
     * any pending fast color clears before we start.
     */

src/mesa/drivers/dri/i965/intel_tex_subimage.c

@@ -134,6 +134,17 @@ intel_texsubimage_tiled_memcpy(struct gl_context * ctx,
       return false;
    }
 
+   /* linear_to_tiled() assumes that if the object is swizzled, it is using
+    * I915_BIT6_SWIZZLE_9_10 for X and I915_BIT6_SWIZZLE_9 for Y.  This is only
+    * true on gen5 and above.
+    *
+    * The killer on top is that some gen4 have an L-shaped swizzle mode, where
+    * parts of the memory aren't swizzled at all. Userspace just can't handle
+    * that.
+    */
+   if (brw->gen < 5 && brw->has_swizzling)
+      return false;
+
    /* Since we are going to write raw data to the miptree, we need to resolve
     * any pending fast color clears before we start.
     */