[PATCH 27/33] rust/pl011: drop dependency on qemu_api

[Paolo Bonzini <pbonzini@redhat.com>]

From: Marc-André Lureau <marcandre.lureau@redhat.com>

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Link: https://lore.kernel.org/r/20250827104147.717203-19-marcandre.lureau@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 rust/hw/char/pl011/wrapper.h       | 51 ++++++++++++++++++++++++++++++
 rust/Cargo.lock                    |  1 -
 rust/hw/char/pl011/Cargo.toml      |  1 -
 rust/hw/char/pl011/build.rs        |  1 +
 rust/hw/char/pl011/meson.build     | 27 ++++++++++++++--
 rust/hw/char/pl011/src/bindings.rs | 27 ++++++++++++++++
 rust/hw/char/pl011/src/device.rs   |  2 +-
 rust/hw/char/pl011/src/lib.rs      |  1 +
 8 files changed, 106 insertions(+), 5 deletions(-)
 create mode 100644 rust/hw/char/pl011/wrapper.h
 create mode 120000 rust/hw/char/pl011/build.rs
 create mode 100644 rust/hw/char/pl011/src/bindings.rs

diff --git a/rust/hw/char/pl011/wrapper.h b/rust/hw/char/pl011/wrapper.h
new file mode 100644
index 00000000000..87a5a589c8e
--- /dev/null
+++ b/rust/hw/char/pl011/wrapper.h
@@ -0,0 +1,51 @@
+/*
+ * QEMU System Emulator
+ *
+ * Copyright (c) 2024 Linaro Ltd.
+ *
+ * Authors: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+
+/*
+ * This header file is meant to be used as input to the `bindgen` application
+ * in order to generate C FFI compatible Rust bindings.
+ */
+
+#ifndef __CLANG_STDATOMIC_H
+#define __CLANG_STDATOMIC_H
+/*
+ * Fix potential missing stdatomic.h error in case bindgen does not insert the
+ * correct libclang header paths on its own. We do not use stdatomic.h symbols
+ * in QEMU code, so it's fine to declare dummy types instead.
+ */
+typedef enum memory_order {
+  memory_order_relaxed,
+  memory_order_consume,
+  memory_order_acquire,
+  memory_order_release,
+  memory_order_acq_rel,
+  memory_order_seq_cst,
+} memory_order;
+#endif /* __CLANG_STDATOMIC_H */
+
+#include "qemu/osdep.h"
+#include "hw/char/pl011.h"
diff --git a/rust/Cargo.lock b/rust/Cargo.lock
index c407029afed..2018d13fbf5 100644
--- a/rust/Cargo.lock
+++ b/rust/Cargo.lock
@@ -149,7 +149,6 @@ dependencies = [
  "common",
  "hwcore",
  "migration",
- "qemu_api",
  "qemu_macros",
  "qom",
  "system",
diff --git a/rust/hw/char/pl011/Cargo.toml b/rust/hw/char/pl011/Cargo.toml
index 9e451fc0aa8..285d25c2178 100644
--- a/rust/hw/char/pl011/Cargo.toml
+++ b/rust/hw/char/pl011/Cargo.toml
@@ -24,7 +24,6 @@ qom = { path = "../../../qom" }
 chardev = { path = "../../../chardev" }
 system = { path = "../../../system" }
 hwcore = { path = "../../../hw/core" }
-qemu_api = { path = "../../../qemu-api" }
 qemu_macros = { path = "../../../qemu-macros" }
 
 [lints]
diff --git a/rust/hw/char/pl011/build.rs b/rust/hw/char/pl011/build.rs
new file mode 120000
index 00000000000..5f5060db356
--- /dev/null
+++ b/rust/hw/char/pl011/build.rs
@@ -0,0 +1 @@
+../../../util/build.rs
\ No newline at end of file
diff --git a/rust/hw/char/pl011/meson.build b/rust/hw/char/pl011/meson.build
index bad6a839c39..a14993f6921 100644
--- a/rust/hw/char/pl011/meson.build
+++ b/rust/hw/char/pl011/meson.build
@@ -1,6 +1,30 @@
+# TODO: Remove this comment when the clang/libclang mismatch issue is solved.
+#
+# Rust bindings generation with `bindgen` might fail in some cases where the
+# detected `libclang` does not match the expected `clang` version/target. In
+# this case you must pass the path to `clang` and `libclang` to your build
+# command invocation using the environment variables CLANG_PATH and
+# LIBCLANG_PATH
+_libpl011_bindings_inc_rs = rust.bindgen(
+  input: 'wrapper.h',
+  dependencies: common_ss.all_dependencies(),
+  output: 'bindings.inc.rs',
+  include_directories: bindings_incdir,
+  bindgen_version: ['>=0.60.0'],
+  args: bindgen_args_common,
+)
+
 _libpl011_rs = static_library(
   'pl011',
-  files('src/lib.rs'),
+  structured_sources(
+    [
+      'src/lib.rs',
+      'src/bindings.rs',
+      'src/device.rs',
+      'src/registers.rs',
+    ],
+    {'.' : _libpl011_bindings_inc_rs},
+  ),
   override_options: ['rust_std=2021', 'build.rust_std=2021'],
   rust_abi: 'rust',
   dependencies: [
@@ -8,7 +32,6 @@ _libpl011_rs = static_library(
     bilge_impl_rs,
     bits_rs,
     common_rs,
-    qemu_api_rs,
     util_rs,
     migration_rs,
     bql_rs,
diff --git a/rust/hw/char/pl011/src/bindings.rs b/rust/hw/char/pl011/src/bindings.rs
new file mode 100644
index 00000000000..bd5ea840cb2
--- /dev/null
+++ b/rust/hw/char/pl011/src/bindings.rs
@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#![allow(
+    dead_code,
+    improper_ctypes_definitions,
+    improper_ctypes,
+    non_camel_case_types,
+    non_snake_case,
+    non_upper_case_globals,
+    unnecessary_transmutes,
+    unsafe_op_in_unsafe_fn,
+    clippy::pedantic,
+    clippy::restriction,
+    clippy::style,
+    clippy::missing_const_for_fn,
+    clippy::ptr_offset_with_cast,
+    clippy::useless_transmute,
+    clippy::missing_safety_doc,
+    clippy::too_many_arguments
+)]
+
+//! `bindgen`-generated declarations.
+
+#[cfg(MESON)]
+include!("bindings.inc.rs");
+
+#[cfg(not(MESON))]
+include!(concat!(env!("OUT_DIR"), "/bindings.inc.rs"));
diff --git a/rust/hw/char/pl011/src/device.rs b/rust/hw/char/pl011/src/device.rs
index 3010b6d9839..85626a969d4 100644
--- a/rust/hw/char/pl011/src/device.rs
+++ b/rust/hw/char/pl011/src/device.rs
@@ -130,7 +130,7 @@ pub struct PL011State {
 // structs, so the size of the Rust version must not be any larger
 // than the size of the C one. If this assert triggers you need to
 // expand the padding_for_rust[] array in the C PL011State struct.
-static_assert!(size_of::<PL011State>() <= size_of::<qemu_api::bindings::PL011State>());
+static_assert!(size_of::<PL011State>() <= size_of::<crate::bindings::PL011State>());
 
 qom_isa!(PL011State : SysBusDevice, DeviceState, Object);
 
diff --git a/rust/hw/char/pl011/src/lib.rs b/rust/hw/char/pl011/src/lib.rs
index 2b70d2ff560..0c19b708c0a 100644
--- a/rust/hw/char/pl011/src/lib.rs
+++ b/rust/hw/char/pl011/src/lib.rs
@@ -12,6 +12,7 @@
 //! See [`PL011State`](crate::device::PL011State) for the device model type and
 //! the [`registers`] module for register types.
 
+mod bindings;
 mod device;
 mod registers;
 
-- 
2.51.0