works with less than base ISA qemu-system-riscv32 -M virt -bios none -kernel output...

[qemu.git] / scripts / block-coroutine-wrapper.py

diff --git a/scripts/block-coroutine-wrapper.py b/scripts/block-coroutine-wrapper.py
index f540003af1c699fe713f52400bccead4c06d2eaa..6e087fa0b7f0748617746f4245a82a8ab18d1ba0 100644 (file)
--- a/scripts/block-coroutine-wrapper.py
+++ b/scripts/block-coroutine-wrapper.py
@@ -69,6 +69,7 @@ class FuncDecl:
         self.struct_name = snake_to_camel(self.name)
         self.args = [ParamDecl(arg.strip()) for arg in args.split(',')]
         self.create_only_co = 'mixed' not in variant
+        self.graph_rdlock = 'bdrv_rdlock' in variant
 
         subsystem, subname = self.name.split('_', 1)
         self.co_name = f'{subsystem}_co_{subname}'
@@ -92,7 +93,8 @@ class FuncDecl:
 
 
 # Match wrappers declared with a co_wrapper mark
-func_decl_re = re.compile(r'^int\s*co_wrapper'
+func_decl_re = re.compile(r'^(?P<return_type>[a-zA-Z][a-zA-Z0-9_]* [\*]?)'
+                          r'\s*co_wrapper'
                           r'(?P<variant>(_[a-z][a-z0-9_]*)?)\s*'
                           r'(?P<wrapper_name>[a-z][a-z0-9_]*)'
                           r'\((?P<args>[^)]*)\);$', re.MULTILINE)
@@ -100,7 +102,7 @@ func_decl_re = re.compile(r'^int\s*co_wrapper'
 
 def func_decl_iter(text: str) -> Iterator:
     for m in func_decl_re.finditer(text):
-        yield FuncDecl(return_type='int',
+        yield FuncDecl(return_type=m.group('return_type'),
                        name=m.group('wrapper_name'),
                        args=m.group('args'),
                        variant=m.group('variant'))
@@ -122,10 +124,13 @@ def create_mixed_wrapper(func: FuncDecl) -> str:
     """
     name = func.co_name
     struct_name = func.struct_name
+    graph_assume_lock = 'assume_graph_lock();' if func.graph_rdlock else ''
+
     return f"""\
-int {func.name}({ func.gen_list('{decl}') })
+{func.return_type} {func.name}({ func.gen_list('{decl}') })
 {{
     if (qemu_in_coroutine()) {{
+        {graph_assume_lock}
         return {name}({ func.gen_list('{name}') });
     }} else {{
         {struct_name} s = {{
@@ -137,7 +142,8 @@ int {func.name}({ func.gen_list('{decl}') })
 
         s.poll_state.co = qemu_coroutine_create({name}_entry, &s);
 
-        return bdrv_poll_co(&s.poll_state);
+        bdrv_poll_co(&s.poll_state);
+        return s.ret;
     }}
 }}"""
 
@@ -149,7 +155,7 @@ def create_co_wrapper(func: FuncDecl) -> str:
     name = func.co_name
     struct_name = func.struct_name
     return f"""\
-int {func.name}({ func.gen_list('{decl}') })
+{func.return_type} {func.name}({ func.gen_list('{decl}') })
 {{
     {struct_name} s = {{
         .poll_state.ctx = {func.ctx},
@@ -161,17 +167,23 @@ int {func.name}({ func.gen_list('{decl}') })
 
     s.poll_state.co = qemu_coroutine_create({name}_entry, &s);
 
-    return bdrv_poll_co(&s.poll_state);
+    bdrv_poll_co(&s.poll_state);
+    return s.ret;
 }}"""
 
 
 def gen_wrapper(func: FuncDecl) -> str:
     assert not '_co_' in func.name
-    assert func.return_type == 'int'
 
     name = func.co_name
     struct_name = func.struct_name
 
+    graph_lock=''
+    graph_unlock=''
+    if func.graph_rdlock:
+        graph_lock='    bdrv_graph_co_rdlock();'
+        graph_unlock='    bdrv_graph_co_rdunlock();'
+
     creation_function = create_mixed_wrapper
     if func.create_only_co:
         creation_function = create_co_wrapper
@@ -183,6 +195,7 @@ def gen_wrapper(func: FuncDecl) -> str:
 
 typedef struct {struct_name} {{
     BdrvPollCo poll_state;
+    {func.return_type} ret;
 { func.gen_block('    {decl};') }
 }} {struct_name};
 
@@ -190,7 +203,9 @@ static void coroutine_fn {name}_entry(void *opaque)
 {{
     {struct_name} *s = opaque;
 
-    s->poll_state.ret = {name}({ func.gen_list('s->{name}') });
+{graph_lock}
+    s->ret = {name}({ func.gen_list('s->{name}') });
+{graph_unlock}
     s->poll_state.in_progress = false;
 
     aio_wait_kick();