uuid: Add app-global UUID registry

Add a very simple uuid-registry.txt file containing all known UUIDs in
the tree, use it to generate a C header (the script validates it in
the process) that can then be used for a simplified
SOF_DEFINE_REG_UUID() mechanism that avoids the risk and temptation
temptation of components incorrectly implementing UUIDs.

The intent is that in the longer term, this file can be used by other
downstream tooling (manifest and topology generation) to more easily
reference known IDs by name in a way that avoids duplication and
error.

Signed-off-by: Andy Ross <[email protected]>

CMakeLists.txt

@@ -184,6 +184,8 @@ if (BUILD_COUNTERS)
 sof_add_build_counter_rule()
 endif()
 
+include(scripts/cmake/uuid-registry.cmake)
+
 add_subdirectory(src)
 
 sof_append_relative_path_definitions(sof)

scripts/cmake/uuid-registry.cmake

@@ -0,0 +1,26 @@
+#
+# UUID registry generation
+#
+
+is_zephyr(zephyr_is)
+if(zephyr_is)
+  set(TOPDIR ${sof_top_dir})
+  set(UUID_REG_H ${PROJECT_BINARY_DIR}/include/generated/uuid-registry.h)
+  set(DEP_TARGET zephyr_interface)
+else()
+  set(TOPDIR ${PROJECT_SOURCE_DIR})
+  set(UUID_REG_H ${PROJECT_BINARY_DIR}/generated/include/uuid-registry.h)
+  set(DEP_TARGET sof_public_headers)
+endif()
+
+add_custom_command(
+	OUTPUT ${UUID_REG_H}
+	COMMAND
+	${PYTHON_EXECUTABLE} ${TOPDIR}/scripts/gen-uuid-reg.py
+	                     ${TOPDIR}/uuid-registry.txt
+			     ${UUID_REG_H})
+
+add_custom_target(uuid_reg_h DEPENDS ${UUID_REG_H})
+
+add_dependencies(${DEP_TARGET} uuid_reg_h)
+

scripts/gen-uuid-reg.py

@@ -0,0 +1,61 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: BSD-3-Clause
+import re
+import sys
+
+# Very simple UUID registry validator and C header generator.  Parses
+# uuid-registry.txt (passed as the first command line argument) and
+# writes a C header (named in the second argument) containing
+# definitions to be used at build time.  Fails via assertion if the
+# any element in the registry is invalid.
+
+header = """/*
+ * GENERATED CODE.  DO NOT EDIT.
+ *
+ * Generated UUID records (initializers for struct sof_uuid)
+ * See scripts/gen-uuid-reg.py
+ */
+#ifndef _UUID_REGISTRY_H
+#define _UUID_REGISTRY_H
+"""
+
+all_syms = set()
+all_uuids = set()
+out_recs = []
+
+def emit_uuid_rec(uu, sym):
+    recs = uu.split('-')
+    brec = recs[3]
+    wrecs = [ "0x" + r for r in recs[0:3] ]
+    byts = [ "0x" + brec[ 2*i : 2*i+2 ] for i in range(int(len(brec) / 2)) ]
+    uuidinit = "{ " + ", ".join(wrecs) + ", { " + ", ".join(byts) + " } }"
+    out_recs.append(f"#define _UUIDREG_{sym} {uuidinit}")
+
+def main():
+    with open(sys.argv[1]) as f:
+        for line in f.readlines():
+            line = re.sub(r'\s*#.*', '', line) # trim comments
+            line = re.sub(r'^\s*', '', line)   # trim leading ws
+            line = re.sub(r'\s*$', '', line)   # trim trailing ws
+            if line == "":
+                continue
+            m = re.match(r'(.*)\s+(.*)', line)
+            assert m
+            (uu, sym) = (m.group(1).lower(), m.group(2))
+            assert re.match(r'[0-9a-f]{8}(?:-[0-9a-f]{4}){2}-[0-9a-f]{16}', uu)
+            assert re.match(r'[a-zA-Z_][a-zA-Z0-9_]*', sym)
+            assert len(sym) < 32
+            assert uu not in all_uuids
+            assert sym not in all_syms
+            all_uuids.add(uu)
+            all_syms.add(sym)
+            emit_uuid_rec(uu, sym)
+
+    with open(sys.argv[2], "w") as f:
+        f.write(header)
+        for l in out_recs:
+            f.write(l + "\n")
+        f.write("#endif /* _UUID_REGISTRY_H */\n")
+
+if __name__ == "__main__":
+	main()

src/include/sof/lib/uuid.h

@@ -9,6 +9,7 @@
 #define __SOF_LIB_UUID_H__
 
 #include <sof/common.h>
+#include <uuid-registry.h>
 
 #ifdef __ZEPHYR__
 #include <zephyr/sys/iterable_sections.h>
@@ -123,6 +124,18 @@ struct sof_uuid_entry {
 	_DEF_UUID(entity_name, uuid_name,			\
 		  _UUID_INIT(va, vb, vc, vd0, vd1, vd2, vd3, vd4, vd5, vd6, vd7))
 
+/** \brief Defines UUID sourced from the fixed SOF registry
+ *
+ * As for SOF_DEFINE_UUID(), but the ID value is sourced by name from
+ * the uuid-registry.txt file distributed with the source tree. The
+ * string name field will be identical with the name passed (which is
+ * passed as a symbol!), runtime symbol (e.g. the "uuid_name" argument
+ * to SOF_DEFINE_UUID()) will be the same, postfixed with a "_uuid".
+ *
+ * \param name Name of the UUID, must match an entry in uuid-registry.txt
+ */
+#define SOF_DEFINE_REG_UUID(name) _DEF_UUID(#name, name##_uuid, _UUIDREG_##name)
+
 /** \brief Creates local unique 32-bit representation of UUID structure.
  *
  * In Zephyr builds, this has the same address as the result of

uuid-registry.txt

@@ -0,0 +1,158 @@
+#
+# Global UUID/name registry for SOF components.  All IDs used in
+# shipped binary artifacts must appear in this list.  All names must
+# be unique.  All names must be legal C identifiers of at most 31
+# characters.  No change to a previously distributed mapping is
+# allowed, ever.
+#
+# Simple format: "#" indicates a comment to end of line.  Remaining
+# lines must be entirely empty/whitespace, or two whitespace-separated
+# fields of: <UUID> <name>
+#
+# NOTE: the UUID is in a SOF-unique format to match the (nonstandard
+# and endian-ambiguous) representation in struct sof_uuid: the first
+# three entries are specied as little endian dword/word values, the
+# last as an ordered array of 8 bytes.  If you have a value from
+# e.g. an RFC-4122 compliant tool, swap the order of the two bytes in
+# the fourth cluster and prepend it to the last.  Most of the time you
+# are just using random values and won't care about the byte swap.
+#
+
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zephyr/CMakeLists.txt

@@ -917,6 +917,8 @@ add_definitions(-DXCC_TOOLS_VERSION="${ZEPHYR_TOOLCHAIN_VARIANT}" -DCC_OPTIMIZE_
 # create version information
 include(../scripts/cmake/version.cmake)
 
+include(../scripts/cmake/uuid-registry.cmake)
+
 # Create Trace realtive file paths
 sof_append_relative_path_definitions(modules_sof)