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Wed, 29 Jan 2025 02:58:16 -0800 (PST) X-Google-Smtp-Source: AGHT+IHwIl3iKLs8VOWDhRPEOSMXDj8eT79UO4yJaSyvpFY//CYNceTpz5mvssTNeQ/KWQYHtNCA7w== X-Received: by 2002:a5d:6d0a:0:b0:385:e30a:394e with SMTP id ffacd0b85a97d-38c51931f8emr2155281f8f.3.1738148295707; Wed, 29 Jan 2025 02:58:15 -0800 (PST) Received: from [192.168.10.3] ([151.62.97.55]) by smtp.googlemail.com with ESMTPSA id 5b1f17b1804b1-438d7aa605asm32217335e9.1.2025.01.29.02.58.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 29 Jan 2025 02:58:15 -0800 (PST) Message-ID: <750f06f3-6326-473f-9d08-ad6bb1f2a54a@redhat.com> Date: Wed, 29 Jan 2025 11:58:14 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Paolo Bonzini Subject: Re: [PATCH 09/10] rust/timer/hpet: add qom and qdev APIs support To: Zhao Liu Cc: Manos Pitsidianakis , Junjie Mao , =?UTF-8?Q?Alex_Benn=C3=A9e?= , =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= , Richard Henderson , Peter Maydell , =?UTF-8?Q?Daniel_P_=2E_Berrang=C3=A9?= , qemu-devel@nongnu.org, qemu-rust@nongnu.org, Zhao Liu References: <20250125125137.1223277-1-zhao1.liu@intel.com> <20250125125137.1223277-10-zhao1.liu@intel.com> Autocrypt: addr=pbonzini@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.129.124; 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_H5=0.001, RCVD_IN_MSPIKE_WL=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-rust@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: QEMU Rust-related patches and discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 29 Jan 2025 10:58:28 -0000 On Sat, Jan 25, 2025 at 1:32 PM Zhao Liu wrote: > fn read(&mut self, addr: hwaddr, _size: u32) -> u64 { This can be &self. > let shift: u64 = (addr & 4) * 8; > > + match addr { > + HPET_TN_CFG_REG => self.config >> shift, // including interrupt capabilities This needs to be "match addr & !4". > + HPET_TN_CMP_REG => self.cmp >> shift, // comparator register > + HPET_TN_FSB_ROUTE_REG => self.fsb >> shift, > + _ => { > + // TODO: Add trace point - trace_hpet_ram_read_invalid() > + // Reserved. > + 0 > + } > + } > + } > + > + fn write(&mut self, addr: hwaddr, value: u64, size: u32) { > + let shift = ((addr & 4) * 8) as u32; > + let len = std::cmp::min(size * 8, 64 - shift); > + > + match addr { > + HPET_TN_CFG_REG => self.set_tn_cfg_reg(shift, len, value), Likewise. > + fn write(&self, addr: hwaddr, value: u64, size: u32) { > + let shift = ((addr & 4) * 8) as u32; > + let len = std::cmp::min(size * 8, 64 - shift); > + > + // TODO: Add trace point - trace_hpet_ram_write(addr, value) > + if (0x100..=0x3ff).contains(&addr ) { > + match self.timer_and_addr(addr) { > + None => return, // Reserved. Clippy complains about an unnecessary return, just replace it with "()". > + Some((timer, addr)) => timer.borrow_mut().write(addr, value, size), > + } > + > + fn reset_hold(&self, _type: ResetType) { > + let sbd = self.upcast::(); > + > + for timer in self.timers.iter().take(self.num_timers.get()) { > + timer.borrow_mut().reset(); > + } > + > + self.counter.set(0); > + self.config.set(0); > + self.pit_enabled.set(true); > + self.hpet_offset.set(0); > + > + HPETFwConfig::update_hpet_cfg( > + self.hpet_id.get(), > + Some(self.capability.get() as u32), > + Some((*sbd).mmio[0].addr), > + ); This can be simply sbd.mmio[0].addr, without the (*...). Also, you can change update_hpet_cfg to take arguments without the Option<> around them. > +// TODO: add OBJECT_DECLARE_SIMPLE_TYPE. > +#[repr(C)] > +pub struct HPETClass { > + parent_class: ::Class, > +} > + > +unsafe impl ObjectType for HPETState { > + type Class = HPETClass; > + const TYPE_NAME: &'static CStr = crate::TYPE_HPET; > +} No need for HPETClass (and for ClassInitImpl), just do unsafe impl ObjectType for HPETState { type Class = ::Class; const TYPE_NAME: &'static CStr = crate::TYPE_HPET; } which is indeed more similar to OBJECT_DECLARE_SIMPLE_TYPE(). Paolo