From: Zhao Liu <zhao1.liu@intel.com>
Add BIT_INFO to QDevProp trait, so that bit related property info could
be bound to u32 & u64.
Then add "bit=*" field in #property attributes macro to allow device to
configure bit property.
In addtion, convert the #property field parsing from `if-else` pattern
to `match` pattern, to help readability. And note, the `bitnr` member of
`Property` struct is generated by manual TokenStream construction,
instead of conditional repetition (like #(bitnr: #bitnr,)?) since
`quote` doesn't support this.
In addtion, rename VALUE member of QDevProp trait to BASE_INFO.
And update the test cases about qdev property.
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Link: https://lore.kernel.org/r/20250920160520.3699591-9-zhao1.liu@intel.com
---
rust/hw/core/src/qdev.rs | 19 ++++++++++++-------
rust/qemu-macros/src/lib.rs | 18 +++++++++++++++---
rust/qemu-macros/src/tests.rs | 8 +++++---
3 files changed, 32 insertions(+), 13 deletions(-)
diff --git a/rust/hw/core/src/qdev.rs b/rust/hw/core/src/qdev.rs
index 85422e0379e..9c82e1716c5 100644
--- a/rust/hw/core/src/qdev.rs
+++ b/rust/hw/core/src/qdev.rs
@@ -109,8 +109,8 @@ pub trait ResettablePhasesImpl {
///
/// # Safety
///
-/// This trait is marked as `unsafe` because `VALUE` must be a valid raw
-/// reference to a [`bindings::PropertyInfo`].
+/// This trait is marked as `unsafe` because `BASE_INFO` and `BIT_INFO` must be
+/// valid raw references to [`bindings::PropertyInfo`].
///
/// Note we could not use a regular reference:
///
@@ -131,14 +131,19 @@ pub trait ResettablePhasesImpl {
/// It is the implementer's responsibility to provide a valid
/// [`bindings::PropertyInfo`] pointer for the trait implementation to be safe.
pub unsafe trait QDevProp {
- const VALUE: *const bindings::PropertyInfo;
+ const BASE_INFO: *const bindings::PropertyInfo;
+ const BIT_INFO: *const bindings::PropertyInfo = {
+ panic!("invalid type for bit property");
+ };
}
macro_rules! impl_qdev_prop {
- ($type:ty,$info:ident) => {
+ ($type:ty,$info:ident$(, $bit_info:ident)?) => {
unsafe impl $crate::qdev::QDevProp for $type {
- const VALUE: *const $crate::bindings::PropertyInfo =
+ const BASE_INFO: *const $crate::bindings::PropertyInfo =
addr_of!($crate::bindings::$info);
+ $(const BIT_INFO: *const $crate::bindings::PropertyInfo =
+ addr_of!($crate::bindings::$bit_info);)?
}
};
}
@@ -146,8 +151,8 @@ unsafe impl $crate::qdev::QDevProp for $type {
impl_qdev_prop!(bool, qdev_prop_bool);
impl_qdev_prop!(u8, qdev_prop_uint8);
impl_qdev_prop!(u16, qdev_prop_uint16);
-impl_qdev_prop!(u32, qdev_prop_uint32);
-impl_qdev_prop!(u64, qdev_prop_uint64);
+impl_qdev_prop!(u32, qdev_prop_uint32, qdev_prop_bit);
+impl_qdev_prop!(u64, qdev_prop_uint64, qdev_prop_bit64);
impl_qdev_prop!(usize, qdev_prop_usize);
impl_qdev_prop!(i32, qdev_prop_int32);
impl_qdev_prop!(i64, qdev_prop_int64);
diff --git a/rust/qemu-macros/src/lib.rs b/rust/qemu-macros/src/lib.rs
index 37e1b723bd5..3e21b67b471 100644
--- a/rust/qemu-macros/src/lib.rs
+++ b/rust/qemu-macros/src/lib.rs
@@ -179,6 +179,7 @@ fn parse(input: ParseStream<'_>) -> syn::Result<Self> {
#[derive(Default, Debug)]
struct DeviceProperty {
rename: Option<DevicePropertyName>,
+ bitnr: Option<syn::Expr>,
defval: Option<syn::Expr>,
}
@@ -187,6 +188,7 @@ fn parse_from(&mut self, a: &Attribute) -> syn::Result<()> {
use attrs::{set, with, Attrs};
let mut parser = Attrs::new();
parser.once("rename", with::eq(set::parse(&mut self.rename)));
+ parser.once("bit", with::eq(set::parse(&mut self.bitnr)));
parser.once("default", with::eq(set::parse(&mut self.defval)));
a.parse_args_with(&mut parser)
}
@@ -222,7 +224,11 @@ fn derive_device_or_error(input: DeriveInput) -> Result<proc_macro2::TokenStream
let mut properties_expanded = vec![];
for (field, prop) in properties {
- let DeviceProperty { rename, defval } = prop;
+ let DeviceProperty {
+ rename,
+ bitnr,
+ defval,
+ } = prop;
let field_name = field.ident.unwrap();
macro_rules! str_to_c_str {
($value:expr, $span:expr) => {{
@@ -252,14 +258,20 @@ macro_rules! str_to_c_str {
},
)?;
let field_ty = field.ty.clone();
- let qdev_prop = quote! { <#field_ty as ::hwcore::QDevProp>::VALUE };
+ let qdev_prop = if bitnr.is_none() {
+ quote! { <#field_ty as ::hwcore::QDevProp>::BASE_INFO }
+ } else {
+ quote! { <#field_ty as ::hwcore::QDevProp>::BIT_INFO }
+ };
+ let bitnr = bitnr.unwrap_or(syn::Expr::Verbatim(quote! { 0 }));
let set_default = defval.is_some();
let defval = defval.unwrap_or(syn::Expr::Verbatim(quote! { 0 }));
properties_expanded.push(quote! {
::hwcore::bindings::Property {
name: ::std::ffi::CStr::as_ptr(#prop_name),
- info: #qdev_prop ,
+ info: #qdev_prop,
offset: ::core::mem::offset_of!(#name, #field_name) as isize,
+ bitnr: #bitnr,
set_default: #set_default,
defval: ::hwcore::bindings::Property__bindgen_ty_1 { u: #defval as u64 },
..::common::Zeroable::ZERO
diff --git a/rust/qemu-macros/src/tests.rs b/rust/qemu-macros/src/tests.rs
index 00a106612fc..ec137132ae7 100644
--- a/rust/qemu-macros/src/tests.rs
+++ b/rust/qemu-macros/src/tests.rs
@@ -60,7 +60,7 @@ struct DummyState {
migrate_clock: bool,
}
},
- "Expected one of `default` or `rename`"
+ "Expected one of `bit`, `default` or `rename`"
);
// Check that repeated attributes are not allowed:
derive_compile_fail!(
@@ -106,8 +106,9 @@ unsafe impl ::hwcore::DevicePropertiesImpl for DummyState {
const PROPERTIES: &'static [::hwcore::bindings::Property] = &[
::hwcore::bindings::Property {
name: ::std::ffi::CStr::as_ptr(c"migrate_clock"),
- info: <bool as ::hwcore::QDevProp>::VALUE,
+ info: <bool as ::hwcore::QDevProp>::BASE_INFO,
offset: ::core::mem::offset_of!(DummyState, migrate_clock) as isize,
+ bitnr: 0,
set_default: true,
defval: ::hwcore::bindings::Property__bindgen_ty_1 { u: true as u64 },
..::common::Zeroable::ZERO
@@ -133,8 +134,9 @@ unsafe impl ::hwcore::DevicePropertiesImpl for DummyState {
const PROPERTIES: &'static [::hwcore::bindings::Property] = &[
::hwcore::bindings::Property {
name: ::std::ffi::CStr::as_ptr(c"migrate-clk"),
- info: <bool as ::hwcore::QDevProp>::VALUE,
+ info: <bool as ::hwcore::QDevProp>::BASE_INFO,
offset: ::core::mem::offset_of!(DummyState, migrate_clock) as isize,
+ bitnr: 0,
set_default: true,
defval: ::hwcore::bindings::Property__bindgen_ty_1 { u: true as u64 },
..::common::Zeroable::ZERO
--
2.51.0