Merge tag 'for-upstream' of https://gitlab.com/bonzini/qemu into staging

* scripts: dump stdin on meson-buildoptions error
* rust: introduce qemu_api::cell::Opaque<>
* rust: express pinning requirements for timers
* rust: hpet: decode HPET registers into enums
* rust: cell: add full example of declaring a SysBusDevice
* rust: qom: remove operations on &mut

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* tag 'for-upstream' of https://gitlab.com/bonzini/qemu: (25 commits)
  rust: pl011: Allow NULL chardev argument to pl011_create()
  meson.build: default to -gsplit-dwarf for debug info
  rust: qom: remove operations on &mut
  rust: cell: add full example of declaring a SysBusDevice
  rust: hpet: decode HPET registers into enums
  rust: pl011: pass around registers::Data
  rust: pl011: switch to safe chardev operation
  rust: pl011: clean up visibilities of callbacks
  rust: pl011: move register definitions out of lib.rs
  rust: chardev: provide basic bindings to character devices
  rust: bindings: remove more unnecessary Send/Sync impls
  rust: chardev: wrap Chardev with Opaque<>
  rust: memory: wrap MemoryRegion with Opaque<>
  rust: sysbus: wrap SysBusDevice with Opaque<>
  rust: hpet: do not access fields of SysBusDevice
  rust: qdev: wrap Clock and DeviceState with Opaque<>
  rust: qom: wrap Object with Opaque<>
  rust: irq: wrap IRQState with Opaque<>
  rust: timer: wrap QEMUTimer with Opaque<> and express pinning requirements
  rust: hpet: embed Timer without the Option and Box indirection
  ...

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 33 insertions, 7 deletions

diff --git a/rust/qemu-api/src/sysbus.rs b/rust/qemu-api/src/sysbus.rs
index 04821a2..e92502a 100644
--- a/rust/qemu-api/src/sysbus.rs
+++ b/rust/qemu-api/src/sysbus.rs
@@ -6,11 +6,11 @@
 
 use std::{ffi::CStr, ptr::addr_of_mut};
 
-pub use bindings::{SysBusDevice, SysBusDeviceClass};
+pub use bindings::SysBusDeviceClass;
 
 use crate::{
     bindings,
-    cell::bql_locked,
+    cell::{bql_locked, Opaque},
     irq::{IRQState, InterruptSource},
     memory::MemoryRegion,
     prelude::*,
@@ -18,6 +18,14 @@ use crate::{
     qom::Owned,
 };
 
+/// A safe wrapper around [`bindings::SysBusDevice`].
+#[repr(transparent)]
+#[derive(Debug, qemu_api_macros::Wrapper)]
+pub struct SysBusDevice(Opaque<bindings::SysBusDevice>);
+
+unsafe impl Send for SysBusDevice {}
+unsafe impl Sync for SysBusDevice {}
+
 unsafe impl ObjectType for SysBusDevice {
     type Class = SysBusDeviceClass;
     const TYPE_NAME: &'static CStr =
@@ -49,7 +57,7 @@ where
     fn init_mmio(&self, iomem: &MemoryRegion) {
         assert!(bql_locked());
         unsafe {
-            bindings::sysbus_init_mmio(self.as_mut_ptr(), iomem.as_mut_ptr());
+            bindings::sysbus_init_mmio(self.upcast().as_mut_ptr(), iomem.as_mut_ptr());
         }
     }
 
@@ -60,7 +68,21 @@ where
     fn init_irq(&self, irq: &InterruptSource) {
         assert!(bql_locked());
         unsafe {
-            bindings::sysbus_init_irq(self.as_mut_ptr(), irq.as_ptr());
+            bindings::sysbus_init_irq(self.upcast().as_mut_ptr(), irq.as_ptr());
+        }
+    }
+
+    // TODO: do we want a type like GuestAddress here?
+    fn mmio_addr(&self, id: u32) -> Option<u64> {
+        assert!(bql_locked());
+        // SAFETY: the BQL ensures that no one else writes to sbd.mmio[], and
+        // the SysBusDevice must be initialized to get an IsA<SysBusDevice>.
+        let sbd = unsafe { *self.upcast().as_ptr() };
+        let id: usize = id.try_into().unwrap();
+        if sbd.mmio[id].memory.is_null() {
+            None
+        } else {
+            Some(sbd.mmio[id].addr)
         }
     }
 
@@ -69,7 +91,7 @@ where
         assert!(bql_locked());
         let id: i32 = id.try_into().unwrap();
         unsafe {
-            bindings::sysbus_mmio_map(self.as_mut_ptr(), id, addr);
+            bindings::sysbus_mmio_map(self.upcast().as_mut_ptr(), id, addr);
         }
     }
 
@@ -79,8 +101,9 @@ where
     fn connect_irq(&self, id: u32, irq: &Owned<IRQState>) {
         assert!(bql_locked());
         let id: i32 = id.try_into().unwrap();
+        let irq: &IRQState = irq;
         unsafe {
-            bindings::sysbus_connect_irq(self.as_mut_ptr(), id, irq.as_mut_ptr());
+            bindings::sysbus_connect_irq(self.upcast().as_mut_ptr(), id, irq.as_mut_ptr());
         }
     }
 
@@ -88,7 +111,10 @@ where
         // TODO: return an Error
         assert!(bql_locked());
         unsafe {
-            bindings::sysbus_realize(self.as_mut_ptr(), addr_of_mut!(bindings::error_fatal));
+            bindings::sysbus_realize(
+                self.upcast().as_mut_ptr(),
+                addr_of_mut!(bindings::error_fatal),
+            );
         }
     }
 }