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Wed, 29 Jan 2025 03:27:47 -0800 (PST) X-Google-Smtp-Source: AGHT+IG/6zvFLxULWh+aonZOkqNwL/5oWgru7y2U30PHEZ9iF1mG/cGqf9ZP3Bb4Ivg2muKipCAhig== X-Received: by 2002:a5d:47c8:0:b0:38a:5d7d:4bd6 with SMTP id ffacd0b85a97d-38c51079cdcmr2575766f8f.25.1738150066480; Wed, 29 Jan 2025 03:27:46 -0800 (PST) From: Paolo Bonzini To: qemu-devel@nongnu.org Subject: [PULL 42/49] rust: pl011: wrap registers with BqlRefCell Date: Wed, 29 Jan 2025 12:27:42 +0100 Message-ID: <20250129112743.1348764-2-pbonzini@redhat.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250129112743.1348764-1-pbonzini@redhat.com> References: <20250129112743.1348764-1-pbonzini@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -33 X-Spam_score: -3.4 X-Spam_bar: --- X-Spam_report: (-3.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.3, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1738150130641019000 Content-Type: text/plain; charset="utf-8" This is a step towards making memory ops use a shared reference to the device type; it's not yet possible due to the calls to character device functions. Reviewed-by: Zhao Liu Signed-off-by: Paolo Bonzini --- rust/hw/char/pl011/src/device.rs | 46 ++++++++++++++++---------- rust/hw/char/pl011/src/device_class.rs | 8 ++--- 2 files changed, 32 insertions(+), 22 deletions(-) diff --git a/rust/hw/char/pl011/src/device.rs b/rust/hw/char/pl011/src/devi= ce.rs index 91c71d0989a..861b8645b76 100644 --- a/rust/hw/char/pl011/src/device.rs +++ b/rust/hw/char/pl011/src/device.rs @@ -109,14 +109,14 @@ pub struct PL011Registers { } =20 #[repr(C)] -#[derive(Debug, qemu_api_macros::Object, qemu_api_macros::offsets)] +#[derive(qemu_api_macros::Object, qemu_api_macros::offsets)] /// PL011 Device Model in QEMU pub struct PL011State { pub parent_obj: ParentField, pub iomem: MemoryRegion, #[doc(alias =3D "chr")] pub char_backend: CharBackend, - pub regs: PL011Registers, + pub regs: BqlRefCell, /// QEMU interrupts /// /// ```text @@ -528,6 +528,7 @@ fn post_init(&self) { } } =20 + #[allow(clippy::needless_pass_by_ref_mut)] pub fn read(&mut self, offset: hwaddr, _size: u32) -> ControlFlow { let mut update_irq =3D false; let result =3D match RegisterOffset::try_from(offset) { @@ -539,7 +540,7 @@ pub fn read(&mut self, offset: hwaddr, _size: u32) -> C= ontrolFlow { // qemu_log_mask(LOG_GUEST_ERROR, "pl011_read: Bad offset = 0x%x\n", (int)offset); ControlFlow::Break(0) } - Ok(field) =3D> match self.regs.read(field) { + Ok(field) =3D> match self.regs.borrow_mut().read(field) { ControlFlow::Break(value) =3D> ControlFlow::Break(value.in= to()), ControlFlow::Continue(value) =3D> { update_irq =3D true; @@ -570,7 +571,10 @@ pub fn write(&mut self, offset: hwaddr, value: u64) { } } =20 - update_irq =3D self.regs.write(field, value as u32, &mut self.= char_backend); + update_irq =3D self + .regs + .borrow_mut() + .write(field, value as u32, &mut self.char_backend); } else { eprintln!("write bad offset {offset} value {value}"); } @@ -581,24 +585,30 @@ pub fn write(&mut self, offset: hwaddr, value: u64) { =20 pub fn can_receive(&self) -> bool { // trace_pl011_can_receive(s->lcr, s->read_count, r); - let regs =3D &self.regs; + let regs =3D self.regs.borrow(); regs.read_count < regs.fifo_depth() } =20 - pub fn receive(&mut self, ch: u32) { - let regs =3D &mut self.regs; + pub fn receive(&self, ch: u32) { + let mut regs =3D self.regs.borrow_mut(); let update_irq =3D !regs.loopback_enabled() && regs.put_fifo(ch); + // Release the BqlRefCell before calling self.update() + drop(regs); + if update_irq { self.update(); } } =20 - pub fn event(&mut self, event: QEMUChrEvent) { + pub fn event(&self, event: QEMUChrEvent) { let mut update_irq =3D false; - let regs =3D &mut self.regs; + let mut regs =3D self.regs.borrow_mut(); if event =3D=3D QEMUChrEvent::CHR_EVENT_BREAK && !regs.loopback_en= abled() { update_irq =3D regs.put_fifo(registers::Data::BREAK.into()); } + // Release the BqlRefCell before calling self.update() + drop(regs); + if update_irq { self.update() } @@ -622,19 +632,19 @@ pub fn realize(&self) { } =20 pub fn reset(&mut self) { - self.regs.reset(); + self.regs.borrow_mut().reset(); } =20 pub fn update(&self) { - let regs =3D &self.regs; + let regs =3D self.regs.borrow(); let flags =3D regs.int_level & regs.int_enabled; for (irq, i) in self.interrupts.iter().zip(IRQMASK) { irq.set(flags & i !=3D 0); } } =20 - pub fn post_load(&mut self, _version_id: u32) -> Result<(), ()> { - self.regs.post_load() + pub fn post_load(&self, _version_id: u32) -> Result<(), ()> { + self.regs.borrow_mut().post_load() } } =20 @@ -671,11 +681,11 @@ pub fn post_load(&mut self, _version_id: u32) -> Resu= lt<(), ()> { /// /// The buffer and size arguments must also be valid. pub unsafe extern "C" fn pl011_receive(opaque: *mut c_void, buf: *const u8= , size: c_int) { - let mut state =3D NonNull::new(opaque).unwrap().cast::(); + let state =3D NonNull::new(opaque).unwrap().cast::(); unsafe { if size > 0 { debug_assert!(!buf.is_null()); - state.as_mut().receive(u32::from(buf.read_volatile())); + state.as_ref().receive(u32::from(buf.read_volatile())); } } } @@ -686,8 +696,8 @@ pub fn post_load(&mut self, _version_id: u32) -> Result= <(), ()> { /// the same size as [`PL011State`]. We also expect the device is /// readable/writeable from one thread at any time. pub unsafe extern "C" fn pl011_event(opaque: *mut c_void, event: QEMUChrEv= ent) { - let mut state =3D NonNull::new(opaque).unwrap().cast::(); - unsafe { state.as_mut().event(event) } + let state =3D NonNull::new(opaque).unwrap().cast::(); + unsafe { state.as_ref().event(event) } } =20 /// # Safety @@ -712,7 +722,7 @@ pub fn post_load(&mut self, _version_id: u32) -> Result= <(), ()> { } =20 #[repr(C)] -#[derive(Debug, qemu_api_macros::Object)] +#[derive(qemu_api_macros::Object)] /// PL011 Luminary device model. pub struct PL011Luminary { parent_obj: ParentField, diff --git a/rust/hw/char/pl011/src/device_class.rs b/rust/hw/char/pl011/sr= c/device_class.rs index d94b98de7bb..8a157a663fb 100644 --- a/rust/hw/char/pl011/src/device_class.rs +++ b/rust/hw/char/pl011/src/device_class.rs @@ -6,7 +6,7 @@ use std::os::raw::{c_int, c_void}; =20 use qemu_api::{ - bindings::*, c_str, vmstate_clock, vmstate_fields, vmstate_of, vmstate= _struct, + bindings::*, c_str, prelude::*, vmstate_clock, vmstate_fields, vmstate= _of, vmstate_struct, vmstate_subsections, vmstate_unused, zeroable::Zeroable, }; =20 @@ -31,8 +31,8 @@ extern "C" fn pl011_clock_needed(opaque: *mut c_void) -> = bool { }; =20 extern "C" fn pl011_post_load(opaque: *mut c_void, version_id: c_int) -> c= _int { - let mut state =3D NonNull::new(opaque).unwrap().cast::(); - let result =3D unsafe { state.as_mut().post_load(version_id as u32) }; + let state =3D NonNull::new(opaque).unwrap().cast::(); + let result =3D unsafe { state.as_ref().post_load(version_id as u32) }; if result.is_err() { -1 } else { @@ -71,7 +71,7 @@ extern "C" fn pl011_post_load(opaque: *mut c_void, versio= n_id: c_int) -> c_int { post_load: Some(pl011_post_load), fields: vmstate_fields! { vmstate_unused!(core::mem::size_of::()), - vmstate_struct!(PL011State, regs, &VMSTATE_PL011_REGS, PL011Regist= ers), + vmstate_struct!(PL011State, regs, &VMSTATE_PL011_REGS, BqlRefCell<= PL011Registers>), }, subsections: vmstate_subsections! { VMSTATE_PL011_CLOCK --=20 2.48.1