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[PULL 064/153] rust/hpet: remove BqlRefCell around HPETTimer

Paolo Bonzini posted 153 patches 1 week, 4 days ago
Maintainers: "Alex Bennée" <alex.bennee@linaro.org>, "Philippe Mathieu-Daudé" <philmd@linaro.org>, Thomas Huth <thuth@redhat.com>, Yonggang Luo <luoyonggang@gmail.com>, Richard Henderson <richard.henderson@linaro.org>, Paolo Bonzini <pbonzini@redhat.com>, Cameron Esfahani <dirty@apple.com>, Roman Bolshakov <rbolshakov@ddn.com>, Phil Dennis-Jordan <phil@philjordan.eu>, Mads Ynddal <mads@ynddal.dk>, Magnus Kulke <magnus.kulke@linux.microsoft.com>, Wei Liu <wei.liu@kernel.org>, Stefano Stabellini <sstabellini@kernel.org>, Anthony PERARD <anthony@xenproject.org>, Paul Durrant <paul@xen.org>, "Edgar E. Iglesias" <edgar.iglesias@gmail.com>, David Hildenbrand <david@kernel.org>, Igor Mammedov <imammedo@redhat.com>, Alistair Francis <alistair.francis@wdc.com>, Stefan Berger <stefanb@linux.vnet.ibm.com>, John Snow <jsnow@redhat.com>, Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>, Kevin Wolf <kwolf@redhat.com>, Hanna Reitz <hreitz@redhat.com>, Stefan Hajnoczi <stefanha@redhat.com>, Fam Zheng <fam@euphon.net>, Aarushi Mehta <mehta.aaru20@gmail.com>, Julia Suvorova <jusual@redhat.com>, Stefano Garzarella <sgarzare@redhat.com>, Stefan Weil <sw@weilnetz.de>, Samuel Thibault <samuel.thibault@ens-lyon.org>, "Marc-André Lureau" <marcandre.lureau@redhat.com>, Zhao Liu <zhao1.liu@intel.com>, Peter Maydell <peter.maydell@linaro.org>, Mauro Carvalho Chehab <mchehab+huawei@kernel.org>, "Daniel P. Berrangé" <berrange@redhat.com>, Luc Michel <luc@lmichel.fr>, Damien Hedde <damien.hedde@dahe.fr>, Peter Xu <peterx@redhat.com>, Fabiano Rosas <farosas@suse.de>, Markus Armbruster <armbru@redhat.com>, Eduardo Habkost <eduardo@habkost.net>, Ani Sinha <anisinha@redhat.com>, Christian Schoenebeck <qemu_oss@crudebyte.com>, Greg Kurz <groug@kaod.org>, "Michael S. Tsirkin" <mst@redhat.com>, Dongjiu Geng <gengdongjiu1@gmail.com>, Aurelien Jarno <aurelien@aurel32.net>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, "Cédric Le Goater" <clg@kaod.org>, Steven Lee <steven_lee@aspeedtech.com>, Troy Lee <leetroy@gmail.com>, Jamin Lin <jamin_lin@aspeedtech.com>, Andrew Jeffery <andrew@codeconstruct.com.au>, Joel Stanley <joel@jms.id.au>, Tyrone Ting <kfting@nuvoton.com>, Hao Wu <wuhaotsh@google.com>, Beniamino Galvani <b.galvani@gmail.com>, Strahinja Jankovic <strahinja.p.jankovic@gmail.com>, Niek Linnenbank <nieklinnenbank@gmail.com>, Samuel Tardieu <sam@rfc1149.net>, Antony Pavlov <antonynpavlov@gmail.com>, Igor Mitsyanko <i.mitsyanko@gmail.com>, Jean-Christophe Dubois <jcd@tribudubois.net>, Andrey Smirnov <andrew.smirnov@gmail.com>, Bernhard Beschow <shentey@gmail.com>, Rob Herring <robh@kernel.org>, Subbaraya Sundeep <sundeep.lkml@gmail.com>, Jan Kiszka <jan.kiszka@web.de>, Felipe Balbi <balbi@kernel.org>, Radoslaw Biernacki <rad@semihalf.com>, Leif Lindholm <leif.lindholm@oss.qualcomm.com>, Eric Auger <eric.auger@redhat.com>, Alexandre Iooss <erdnaxe@crans.org>, Shannon Zhao <shannon.zhaosl@gmail.com>, Gerd Hoffmann <kraxel@redhat.com>, Laurent Vivier <laurent@vivier.eu>, Michael Rolnik <mrolnik@gmail.com>, Raphael Norwitz <raphael@enfabrica.net>, Helge Deller <deller@gmx.de>, "Clément Chigot" <chigot@adacore.com>, Frederic Konrad <konrad.frederic@yahoo.fr>, Alberto Garcia <berto@igalia.com>, Yoshinori Sato <yoshinori.sato@nifty.com>, Magnus Damm <magnus.damm@gmail.com>, Palmer Dabbelt <palmer@dabbelt.com>, Weiwei Li <liwei1518@gmail.com>, Daniel Henrique Barboza <dbarboza@ventanamicro.com>, Liu Zhiwei <zhiwei_liu@linux.alibaba.com>, Halil Pasic <pasic@linux.ibm.com>, Christian Borntraeger <borntraeger@linux.ibm.com>, Jason Herne <jjherne@linux.ibm.com>, Vijai Kumar K <vijai@behindbytes.com>, Nicholas Piggin <npiggin@gmail.com>, Harsh Prateek Bora <harshpb@linux.ibm.com>, "Collin L. Walling" <walling@linux.ibm.com>, Amit Shah <amit@kernel.org>, Yanan Wang <wangyanan55@huawei.com>, Riku Voipio <riku.voipio@iki.fi>, Paul Burton <paulburton@kernel.org>, Aleksandar Rikalo <arikalo@gmail.com>, Jonathan Cameron <jonathan.cameron@huawei.com>, Fan Ni <fan.ni@samsung.com>, Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>, "Hervé Poussineau" <hpoussin@reactos.org>, BALATON Zoltan <balaton@eik.bme.hu>, Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>, Dmitry Osipenko <dmitry.osipenko@collabora.com>, Dmitry Fleytman <dmitry.fleytman@gmail.com>, Ninad Palsule <ninad@linux.ibm.com>, Glenn Miles <milesg@linux.ibm.com>, "Maciej S. Szmigiero" <maciej.szmigiero@oracle.com>, Corey Minyard <cminyard@mvista.com>, Patrick Leis <venture@google.com>, Alejandro Jimenez <alejandro.j.jimenez@oracle.com>, Sairaj Kodilkar <sarunkod@amd.com>, Jason Wang <jasowang@redhat.com>, Yi Liu <yi.l.liu@intel.com>, "Clément Mathieu--Drif" <clement.mathieu--drif@eviden.com>, David Woodhouse <dwmw2@infradead.org>, Sergio Lopez <slp@redhat.com>, Alexander Graf <graf@amazon.com>, Dorjoy Chowdhury <dorjoychy111@gmail.com>, Song Gao <gaosong@loongson.cn>, Bibo Mao <maobibo@loongson.cn>, Jiaxun Yang <jiaxun.yang@flygoat.com>, Huacai Chen <chenhuacai@kernel.org>, Jia Liu <proljc@gmail.com>, Gautam Menghani <gautam@linux.ibm.com>, Aditya Gupta <adityag@linux.ibm.com>, Xiao Guangrong <xiaoguangrong.eric@gmail.com>, Alexander Bulekov <alxndr@bu.edu>, Bandan Das <bsd@redhat.com>, Darren Kenny <darren.kenny@oracle.com>, Qiuhao Li <Qiuhao.Li@outlook.com>, Artyom Tarasenko <atar4qemu@gmail.com>, Gustavo Romero <gustavo.romero@linaro.org>, Francisco Iglesias <francisco.iglesias@amd.com>, Pavel Pisa <pisa@cmp.felk.cvut.cz>, Vikram Garhwal <vikram.garhwal@bytedance.com>, Sriram Yagnaraman <sriram.yagnaraman@ericsson.com>, Max Filippov <jcmvbkbc@gmail.com>, Jiri Pirko <jiri@resnulli.us>, Sven Schnelle <svens@stackframe.org>, Stafford Horne <shorne@gmail.com>, Elena Ufimtseva <elena.ufimtseva@oracle.com>, Jagannathan Raman <jag.raman@oracle.com>, Chinmay Rath <rathc@linux.ibm.com>, Sai Pavan Boddu <sai.pavan.boddu@amd.com>, Ran Wang <wangran@bosc.ac.cn>, Anup Patel <anup.patel@wdc.com>, Eric Farman <farman@linux.ibm.com>, Matthew Rosato <mjrosato@linux.ibm.com>, Ilya Leoshkevich <iii@linux.ibm.com>, Tony Krowiak <akrowiak@linux.ibm.com>, Farhan Ali <alifm@linux.ibm.com>, Nina Schoetterl-Glausch <nsg@linux.ibm.com>, Jared Rossi <jrossi@linux.ibm.com>, Zhuoying Cai <zycai@linux.ibm.com>, Cornelia Huck <cohuck@redhat.com>, Hannes Reinecke <hare@suse.com>, Bin Meng <bmeng.cn@gmail.com>, Titus Rwantare <titusr@google.com>, Bastian Koppelmann <kbastian@mail.uni-paderborn.de>, Jeuk Kim <jeuk20.kim@samsung.com>, "Hongren (Zenithal) Zheng" <i@zenithal.me>, "Canokeys.org" <contact@canokeys.org>, John Levon <john.levon@nutanix.com>, Thanos Makatos <thanos.makatos@nutanix.com>, Alex Williamson <alex@shazbot.org>, Tomita Moeko <tomitamoeko@gmail.com>, Viresh Kumar <viresh.kumar@linaro.org>, Mathieu Poirier <mathieu.poirier@linaro.org>, Manos Pitsidianakis <manos.pitsidianakis@linaro.org>, "Gonglei (Arei)" <arei.gonglei@huawei.com>, Eric Blake <eblake@redhat.com>, Keith Busch <kbusch@kernel.org>, Klaus Jensen <its@irrelevant.dk>, Jesper Devantier <foss@defmacro.it>, Huai-Cheng Kuo <hchkuo@avery-design.com.tw>, Chris Browy <cbrowy@avery-design.com>, Zhenzhong Duan <zhenzhong.duan@intel.com>, "Dr. David Alan Gilbert" <dave@treblig.org>, Zhang Chen <zhangckid@gmail.com>, Li Zhijian <lizhijian@fujitsu.com>, Mahmoud Mandour <ma.mandourr@gmail.com>, Pierrick Bouvier <pierrick.bouvier@linaro.org>, Cleber Rosa <crosa@redhat.com>, Michael Roth <michael.roth@amd.com>, Maksim Davydov <davydov-max@yandex-team.ru>, David Gibson <david@gibson.dropbear.id.au>, Hyman Huang <yong.huang@smartx.com>, Brian Cain <brian.cain@oss.qualcomm.com>, Marcelo Tosatti <mtosatti@redhat.com>, Pedro Barbuda <pbarbuda@microsoft.com>, Mohamed Mediouni <mohamed@unpredictable.fr>, Coiby Xu <Coiby.Xu@gmail.com>
[PULL 064/153] rust/hpet: remove BqlRefCell around HPETTimer
Posted by Paolo Bonzini 1 week, 4 days ago 
HPETTimer now has all of its state stored in HPETRegisters, so it does not
need its own BqlRefCell anymore.

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 rust/hw/timer/hpet/src/device.rs | 55 ++++++++++++++++----------------
 rust/util/src/timer.rs           | 12 ++++---
 2 files changed, 34 insertions(+), 33 deletions(-)

diff --git a/rust/hw/timer/hpet/src/device.rs b/rust/hw/timer/hpet/src/device.rs
index 005e41aec47..0dbfc5b3bab 100644
--- a/rust/hw/timer/hpet/src/device.rs
+++ b/rust/hw/timer/hpet/src/device.rs
@@ -126,7 +126,7 @@ enum DecodedRegister<'a> {
     Global(GlobalRegister),
 
     /// Register in the timer block `0x100`...`0x3ff`
-    Timer(&'a BqlRefCell<HPETTimer>, TimerRegister),
+    Timer(&'a HPETTimer, TimerRegister),
 
     /// Invalid address
     #[allow(dead_code)]
@@ -170,8 +170,7 @@ const fn deactivating_bit(old: u64, new: u64, shift: usize) -> bool {
     (old & mask != 0) && (new & mask == 0)
 }
 
-fn timer_handler(timer_cell: &BqlRefCell<HPETTimer>) {
-    let t = timer_cell.borrow();
+fn timer_handler(t: &HPETTimer) {
     // SFAETY: state field is valid after timer initialization.
     let hpet_regs = &unsafe { t.state.as_ref() }.regs;
     t.callback(&mut hpet_regs.borrow_mut())
@@ -277,12 +276,16 @@ fn new(index: u8, state: *const HPETState) -> HPETTimer {
         }
     }
 
-    fn init_timer_with_cell(cell: &BqlRefCell<Self>) {
-        let mut timer = cell.borrow_mut();
-        // SAFETY: HPETTimer is only used as part of HPETState, which is
-        // always pinned.
-        let qemu_timer = unsafe { Pin::new_unchecked(&mut timer.qemu_timer) };
-        qemu_timer.init_full(None, CLOCK_VIRTUAL, Timer::NS, 0, timer_handler, cell);
+    fn init_timer(timer: Pin<&mut Self>) {
+        Timer::init_full(
+            timer,
+            None,
+            CLOCK_VIRTUAL,
+            Timer::NS,
+            0,
+            timer_handler,
+            |t| &mut t.qemu_timer,
+        );
     }
 
     fn get_state(&self) -> &HPETState {
@@ -619,7 +622,7 @@ pub struct HPETState {
 
     /// HPET timer array managed by this timer block.
     #[doc(alias = "timer")]
-    timers: [BqlRefCell<HPETTimer>; HPET_MAX_TIMERS],
+    timers: [HPETTimer; HPET_MAX_TIMERS],
     #[property(rename = "timers", default = HPET_MIN_TIMERS)]
     num_timers: usize,
     num_timers_save: BqlCell<u8>,
@@ -662,11 +665,10 @@ fn init_timers(this: &mut MaybeUninit<Self>) {
 
             // Initialize in two steps, to avoid calling Timer::init_full on a
             // temporary that can be moved.
-            let timer = timer.write(BqlRefCell::new(HPETTimer::new(
-                index.try_into().unwrap(),
-                state,
-            )));
-            HPETTimer::init_timer_with_cell(timer);
+            let timer = timer.write(HPETTimer::new(index.try_into().unwrap(), state));
+            // SAFETY: HPETState is pinned
+            let timer = unsafe { Pin::new_unchecked(timer) };
+            HPETTimer::init_timer(timer);
         }
     }
 
@@ -683,8 +685,7 @@ fn set_cfg_reg(&self, regs: &mut HPETRegisters, shift: u32, len: u32, val: u64)
             self.hpet_offset
                 .set(ticks_to_ns(regs.counter) - CLOCK_VIRTUAL.get_ns());
 
-            for timer in self.timers.iter().take(self.num_timers) {
-                let t = timer.borrow();
+            for t in self.timers.iter().take(self.num_timers) {
                 let id = t.index as usize;
                 let tn_regs = &regs.tn_regs[id];
 
@@ -697,8 +698,8 @@ fn set_cfg_reg(&self, regs: &mut HPETRegisters, shift: u32, len: u32, val: u64)
             // Halt main counter and disable interrupt generation.
             regs.counter = self.get_ticks();
 
-            for timer in self.timers.iter().take(self.num_timers) {
-                timer.borrow().del_timer(regs);
+            for t in self.timers.iter().take(self.num_timers) {
+                t.del_timer(regs);
             }
         }
 
@@ -720,9 +721,9 @@ fn set_int_status_reg(&self, regs: &mut HPETRegisters, shift: u32, _len: u32, va
         let new_val = val << shift;
         let cleared = new_val & regs.int_status;
 
-        for (index, timer) in self.timers.iter().take(self.num_timers).enumerate() {
-            if cleared & (1 << index) != 0 {
-                timer.borrow().update_irq(regs, false);
+        for t in self.timers.iter().take(self.num_timers) {
+            if cleared & (1 << t.index) != 0 {
+                t.update_irq(regs, false);
             }
         }
     }
@@ -807,8 +808,8 @@ fn realize(&self) -> util::Result<()> {
 
     fn reset_hold(&self, _type: ResetType) {
         let mut regs = self.regs.borrow_mut();
-        for timer in self.timers.iter().take(self.num_timers) {
-            timer.borrow().reset(&mut regs);
+        for t in self.timers.iter().take(self.num_timers) {
+            t.reset(&mut regs);
         }
 
         regs.counter = 0;
@@ -864,7 +865,7 @@ fn read(&self, addr: hwaddr, size: u32) -> u64 {
         use DecodedRegister::*;
         use GlobalRegister::*;
         (match target {
-            Timer(timer, tn_target) => timer.borrow().read(tn_target, regs),
+            Timer(t, tn_target) => t.read(tn_target, regs),
             Global(CAP) => regs.capability, /* including HPET_PERIOD 0x004 */
             Global(CFG) => regs.config,
             Global(INT_STATUS) => regs.int_status,
@@ -895,9 +896,7 @@ fn write(&self, addr: hwaddr, value: u64, size: u32) {
         use DecodedRegister::*;
         use GlobalRegister::*;
         match target {
-            Timer(timer, tn_target) => timer
-                .borrow()
-                .write(tn_target, &mut regs, value, shift, len),
+            Timer(t, tn_target) => t.write(tn_target, &mut regs, value, shift, len),
             Global(CAP) => {} // General Capabilities and ID Register: Read Only
             Global(CFG) => self.set_cfg_reg(&mut regs, shift, len, value),
             Global(INT_STATUS) => self.set_int_status_reg(&mut regs, shift, len, value),
diff --git a/rust/util/src/timer.rs b/rust/util/src/timer.rs
index c6b3e4088ec..829f52d111e 100644
--- a/rust/util/src/timer.rs
+++ b/rust/util/src/timer.rs
@@ -45,14 +45,14 @@ impl Timer {
     }
 
     /// Create a new timer with the given attributes.
-    pub fn init_full<'timer, 'opaque: 'timer, T, F>(
-        self: Pin<&'timer mut Self>,
+    pub fn init_full<T, F>(
+        opaque: Pin<&mut T>,
         timer_list_group: Option<&TimerListGroup>,
         clk_type: ClockType,
         scale: u32,
         attributes: u32,
         _cb: F,
-        opaque: &'opaque T,
+        field: impl FnOnce(&mut T) -> &mut Self,
     ) where
         F: for<'a> FnCall<(&'a T,)>,
     {
@@ -70,8 +70,10 @@ pub fn init_full<'timer, 'opaque: 'timer, T, F>(
 
         // SAFETY: the opaque outlives the timer
         unsafe {
+            let opaque = Pin::into_inner_unchecked(opaque);
+            let timer = field(opaque).as_mut_ptr();
             timer_init_full(
-                self.as_mut_ptr(),
+                timer,
                 if let Some(g) = timer_list_group {
                     g as *const TimerListGroup as *mut _
                 } else {
@@ -81,7 +83,7 @@ pub fn init_full<'timer, 'opaque: 'timer, T, F>(
                 scale as c_int,
                 attributes as c_int,
                 Some(timer_cb),
-                (opaque as *const T).cast::<c_void>().cast_mut(),
+                (opaque as *mut T).cast::<c_void>(),
             )
         }
     }
-- 
2.52.0

Patchew 2.1-devel-b67e4c2

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