intel/genxml: Add support for excluding items when importing

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20593>

src/intel/genxml/gen_pack_header.py

@@ -486,7 +486,7 @@ class Parser(object):
                 self.prefix = None
         elif name == "value":
             self.values.append(Value(attrs))
-        elif name == "import":
+        elif name in ("import", "exclude"):
             pass
         else:
             assert False
@@ -514,7 +514,7 @@ class Parser(object):
         elif name  == "enum":
             self.emit_enum()
             self.enum = None
-        elif name in ("import", "value"):
+        elif name in ("import", "exclude", "value"):
             pass
         else:
             assert False

src/intel/genxml/intel_genxml.py

@@ -86,6 +86,7 @@ class Struct(object):
 GENXML_DESC = {
     'genxml'      : [ 'name', 'gen', ],
     'import'      : [ 'name', ],
+    'exclude'     : [ 'name', ],
     'enum'        : [ 'name', 'value', 'prefix', ],
     'struct'      : [ 'name', 'length', ],
     'field'       : [ 'name', 'start', 'end', 'type', 'default', 'prefix', 'nonzero' ],
@@ -224,6 +225,10 @@ class GenXml(object):
             if item.tag == 'import':
                 assert 'name' in item.attrib
                 filename = os.path.split(item.attrib['name'])
+                exceptions = set()
+                for e in item:
+                    assert e.tag == 'exclude'
+                    exceptions.add(e.attrib['name'])
                 # We should be careful to restrict loaded files to
                 # those under the source or build trees. For now, only
                 # allow siblings of the current xml file.
@@ -250,6 +255,8 @@ class GenXml(object):
                 for i in imported_elements:
                     if i.tag not in orig_by_tag:
                         continue
+                    if i.attrib['name'] in exceptions:
+                        continue
                     if i.attrib['name'] in orig_by_tag[i.tag]:
                         # An item with this same name was defined in
                         # the genxml directly. There we should ignore