From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EF5C337AA98; Thu, 21 May 2026 23:40:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779406850; cv=none; b=d7GaArf8wjU1r0yJZhbFfqLY4Bm7apgBRRk09iQFHrplz+7WB7xf7O8TzpH7uAWgtsGjYR8SIXLQX9IxpWhcuBQcXFJJDm8zcoqZk5bZT8NasxVzgRUBnrQIYrD27xEYIG7vDzhUmkEpJVD2JiEYvPxy4hjhVaJdrI3t+um63hA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779406850; c=relaxed/simple; bh=4mBnT+XCk3fYBL73tUA9IcFSyce8Cof0UyELaL6VX9A=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=MwCHb6kpg/TSR7bfY7zBUSFKNBNINJkRWo3wltj7Ar1rvLfwLq7qDkyt3UXtczdoVbaKff/7RV0sEYy2KSOc9l3sX/sYll0K/dmAcXSzyt3VXfBx+qQmZ1VnY92cxpS6MZP9tKZWSUw7xjfOGRbe8HGqA4qyy9FX8K/jnJQozrU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ZWeSp50s; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ZWeSp50s" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 769131F00A3B; Thu, 21 May 2026 23:40:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779406841; bh=TCATN4a3J13CaAJic6O/YHUTHiJNywIl5P/UqO/Kk68=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ZWeSp50sQ86wRbADZPpdXpJ0xDg+2mCbW3rZZsaiYYNzue7BnkhEkgYvCM/9KXKoP WLtc2eSbUcHwDWJBKihr8hrYlLhF8eo6xPuL4iq0xfqY3EryefZJMQPveFBfc8I3Vl bFsmJGLGrpwQ1SUffzDpv3Ire0mTMpuLrFnUdx8iv0rIy1xgyR900FrXEYE8cV5G5j sA7G19r+CksL21tOGCX+q6IS/0917xStjjmh2/yHbOFfjPFwuK845bcje+uDxg0qM0 UJvyRRvoZ2CS01a8O9Qq37UWAoM1zhIa5NJSvR9Y71wLaBBfS48P4dxw7V7U/qPNtz bWJb/talzJ4jw== From: Danilo Krummrich To: gregkh@linuxfoundation.org, rafael@kernel.org, acourbot@nvidia.com, aliceryhl@google.com, david.m.ertman@intel.com, ira.weiny@intel.com, leon@kernel.org, viresh.kumar@linaro.org, m.wilczynski@samsung.com, ukleinek@kernel.org, bhelgaas@google.com, kwilczynski@kernel.org, abdiel.janulgue@gmail.com, robin.murphy@arm.com, markus.probst@posteo.de, ojeda@kernel.org, boqun@kernel.org, gary@garyguo.net, bjorn3_gh@protonmail.com, lossin@kernel.org, a.hindborg@kernel.org, tmgross@umich.edu, igor.korotin@linux.dev, daniel.almeida@collabora.com, pcolberg@redhat.com Cc: driver-core@lists.linux.dev, linux-kernel@vger.kernel.org, nova-gpu@lists.linux.dev, dri-devel@lists.freedesktop.org, linux-pm@vger.kernel.org, linux-pwm@vger.kernel.org, linux-pci@vger.kernel.org, rust-for-linux@vger.kernel.org, Danilo Krummrich Subject: [PATCH v4 12/27] rust: platform: make Driver trait lifetime-parameterized Date: Fri, 22 May 2026 01:34:38 +0200 Message-ID: <20260521233501.1191842-13-dakr@kernel.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260521233501.1191842-1-dakr@kernel.org> References: <20260521233501.1191842-1-dakr@kernel.org> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add a 'bound lifetime to the associated Data, changing type Data to type Data<'bound>. This allows the driver's bus device private data to capture the device / driver bound lifetime; device resources can be stored directly by reference rather than requiring Devres. The probe() and unbind() callbacks thus gain a 'bound lifetime parameter on the methods themselves; avoiding a global lifetime on the trait impl. Existing drivers set type Data<'bound> = Self, preserving the current behavior. Acked-by: Uwe Kleine-König Reviewed-by: Alexandre Courbot Signed-off-by: Danilo Krummrich --- drivers/cpufreq/rcpufreq_dt.rs | 10 +++++----- drivers/gpu/drm/tyr/driver.rs | 10 +++++----- drivers/pwm/pwm_th1520.rs | 10 +++++----- rust/kernel/cpufreq.rs | 10 +++++----- rust/kernel/io/mem.rs | 20 ++++++++++---------- rust/kernel/platform.rs | 26 +++++++++++++------------- samples/rust/rust_debugfs.rs | 10 +++++----- samples/rust/rust_driver_platform.rs | 10 +++++----- samples/rust/rust_i2c_client.rs | 15 +++++++++------ samples/rust/rust_soc.rs | 10 +++++----- 10 files changed, 67 insertions(+), 64 deletions(-) diff --git a/drivers/cpufreq/rcpufreq_dt.rs b/drivers/cpufreq/rcpufreq_dt.rs index 5e0b224f6699..10106fa13095 100644 --- a/drivers/cpufreq/rcpufreq_dt.rs +++ b/drivers/cpufreq/rcpufreq_dt.rs @@ -201,13 +201,13 @@ fn register_em(policy: &mut cpufreq::Policy) { impl platform::Driver for CPUFreqDTDriver { type IdInfo = (); - type Data = Self; + type Data<'bound> = Self; const OF_ID_TABLE: Option> = Some(&OF_TABLE); - fn probe( - pdev: &platform::Device>, - _id_info: Option<&Self::IdInfo>, - ) -> impl PinInit { + fn probe<'bound>( + pdev: &'bound platform::Device>, + _id_info: Option<&'bound Self::IdInfo>, + ) -> impl PinInit + 'bound { cpufreq::Registration::::new_foreign_owned(pdev.as_ref())?; Ok(Self {}) } diff --git a/drivers/gpu/drm/tyr/driver.rs b/drivers/gpu/drm/tyr/driver.rs index 001727f44fc8..797f09e23a4c 100644 --- a/drivers/gpu/drm/tyr/driver.rs +++ b/drivers/gpu/drm/tyr/driver.rs @@ -91,13 +91,13 @@ fn issue_soft_reset(dev: &Device, iomem: &Devres) -> Result { impl platform::Driver for TyrPlatformDriverData { type IdInfo = (); - type Data = Self; + type Data<'bound> = Self; const OF_ID_TABLE: Option> = Some(&OF_TABLE); - fn probe( - pdev: &platform::Device>, - _info: Option<&Self::IdInfo>, - ) -> impl PinInit { + fn probe<'bound>( + pdev: &'bound platform::Device>, + _info: Option<&'bound Self::IdInfo>, + ) -> impl PinInit + 'bound { let core_clk = Clk::get(pdev.as_ref(), Some(c"core"))?; let stacks_clk = OptionalClk::get(pdev.as_ref(), Some(c"stacks"))?; let coregroup_clk = OptionalClk::get(pdev.as_ref(), Some(c"coregroup"))?; diff --git a/drivers/pwm/pwm_th1520.rs b/drivers/pwm/pwm_th1520.rs index df83a4a9a507..6c5b791f3153 100644 --- a/drivers/pwm/pwm_th1520.rs +++ b/drivers/pwm/pwm_th1520.rs @@ -316,13 +316,13 @@ fn drop(self: Pin<&mut Self>) { impl platform::Driver for Th1520PwmPlatformDriver { type IdInfo = (); - type Data = Self; + type Data<'bound> = Self; const OF_ID_TABLE: Option> = Some(&OF_TABLE); - fn probe( - pdev: &platform::Device>, - _id_info: Option<&Self::IdInfo>, - ) -> impl PinInit { + fn probe<'bound>( + pdev: &'bound platform::Device>, + _id_info: Option<&'bound Self::IdInfo>, + ) -> impl PinInit + 'bound { let dev = pdev.as_ref(); let request = pdev.io_request_by_index(0).ok_or(ENODEV)?; diff --git a/rust/kernel/cpufreq.rs b/rust/kernel/cpufreq.rs index 0df518fa1d77..d94c6cdbc45a 100644 --- a/rust/kernel/cpufreq.rs +++ b/rust/kernel/cpufreq.rs @@ -888,13 +888,13 @@ fn register_em(_policy: &mut Policy) { /// /// impl platform::Driver for SampleDriver { /// type IdInfo = (); -/// type Data = Self; +/// type Data<'bound> = Self; /// const OF_ID_TABLE: Option> = None; /// -/// fn probe( -/// pdev: &platform::Device>, -/// _id_info: Option<&Self::IdInfo>, -/// ) -> impl PinInit { +/// fn probe<'bound>( +/// pdev: &'bound platform::Device>, +/// _id_info: Option<&'bound Self::IdInfo>, +/// ) -> impl PinInit + 'bound { /// cpufreq::Registration::::new_foreign_owned(pdev.as_ref())?; /// Ok(Self {}) /// } diff --git a/rust/kernel/io/mem.rs b/rust/kernel/io/mem.rs index 03d8745b5e1d..51ba347220ee 100644 --- a/rust/kernel/io/mem.rs +++ b/rust/kernel/io/mem.rs @@ -62,12 +62,12 @@ pub(crate) unsafe fn new(device: &'a Device, resource: &'a Resource) -> S /// /// impl platform::Driver for SampleDriver { /// # type IdInfo = (); - /// # type Data = Self; + /// # type Data<'bound> = Self; /// - /// fn probe( - /// pdev: &platform::Device>, - /// info: Option<&Self::IdInfo>, - /// ) -> impl PinInit { + /// fn probe<'bound>( + /// pdev: &'bound platform::Device>, + /// info: Option<&'bound Self::IdInfo>, + /// ) -> impl PinInit + 'bound { /// let offset = 0; // Some offset. /// /// // If the size is known at compile time, use [`Self::iomap_sized`]. @@ -127,12 +127,12 @@ pub fn iomap_exclusive_sized( /// /// impl platform::Driver for SampleDriver { /// # type IdInfo = (); - /// # type Data = Self; + /// # type Data<'bound> = Self; /// - /// fn probe( - /// pdev: &platform::Device>, - /// info: Option<&Self::IdInfo>, - /// ) -> impl PinInit { + /// fn probe<'bound>( + /// pdev: &'bound platform::Device>, + /// info: Option<&'bound Self::IdInfo>, + /// ) -> impl PinInit + 'bound { /// let offset = 0; // Some offset. /// /// // Unlike [`Self::iomap_sized`], here the size of the memory region diff --git a/rust/kernel/platform.rs b/rust/kernel/platform.rs index 257b7084338c..2d841e8d1ad3 100644 --- a/rust/kernel/platform.rs +++ b/rust/kernel/platform.rs @@ -50,7 +50,7 @@ // - `DEVICE_DRIVER_OFFSET` is the correct byte offset to the embedded `struct device_driver`. unsafe impl driver::DriverLayout for Adapter { type DriverType = bindings::platform_driver; - type DriverData<'bound> = T::Data; + type DriverData<'bound> = T::Data<'bound>; const DEVICE_DRIVER_OFFSET: usize = core::mem::offset_of!(Self::DriverType, driver); } @@ -118,7 +118,7 @@ extern "C" fn remove_callback(pdev: *mut bindings::platform_device) { // SAFETY: `remove_callback` is only ever called after a successful call to // `probe_callback`, hence it's guaranteed that `Device::set_drvdata()` has been called // and stored a `Pin>`. - let data = unsafe { pdev.as_ref().drvdata_borrow::() }; + let data = unsafe { pdev.as_ref().drvdata_borrow::>() }; T::unbind(pdev, data); } @@ -192,14 +192,14 @@ macro_rules! module_platform_driver { /// /// impl platform::Driver for MyDriver { /// type IdInfo = (); -/// type Data = Self; +/// type Data<'bound> = Self; /// const OF_ID_TABLE: Option> = Some(&OF_TABLE); /// const ACPI_ID_TABLE: Option> = Some(&ACPI_TABLE); /// -/// fn probe( -/// _pdev: &platform::Device>, -/// _id_info: Option<&Self::IdInfo>, -/// ) -> impl PinInit { +/// fn probe<'bound>( +/// _pdev: &'bound platform::Device>, +/// _id_info: Option<&'bound Self::IdInfo>, +/// ) -> impl PinInit, Error> + 'bound { /// Err(ENODEV) /// } /// } @@ -214,7 +214,7 @@ pub trait Driver { type IdInfo: 'static; /// The type of the driver's bus device private data. - type Data: Send; + type Data<'bound>: Send + 'bound; /// The table of OF device ids supported by the driver. const OF_ID_TABLE: Option> = None; @@ -226,10 +226,10 @@ pub trait Driver { /// /// Called when a new platform device is added or discovered. /// Implementers should attempt to initialize the device here. - fn probe( - dev: &Device>, - id_info: Option<&Self::IdInfo>, - ) -> impl PinInit; + fn probe<'bound>( + dev: &'bound Device>, + id_info: Option<&'bound Self::IdInfo>, + ) -> impl PinInit, Error> + 'bound; /// Platform driver unbind. /// @@ -241,7 +241,7 @@ fn probe( /// operations to gracefully tear down the device. /// /// Otherwise, release operations for driver resources should be performed in `Drop`. - fn unbind(dev: &Device>, this: Pin<&Self::Data>) { + fn unbind<'bound>(dev: &'bound Device>, this: Pin<&Self::Data<'bound>>) { let _ = (dev, this); } } diff --git a/samples/rust/rust_debugfs.rs b/samples/rust/rust_debugfs.rs index 37640ed33642..1f59e08aaa4b 100644 --- a/samples/rust/rust_debugfs.rs +++ b/samples/rust/rust_debugfs.rs @@ -117,14 +117,14 @@ fn from_str(s: &str) -> Result { impl platform::Driver for RustDebugFs { type IdInfo = (); - type Data = Self; + type Data<'bound> = Self; const OF_ID_TABLE: Option> = None; const ACPI_ID_TABLE: Option> = Some(&ACPI_TABLE); - fn probe( - pdev: &platform::Device>, - _info: Option<&Self::IdInfo>, - ) -> impl PinInit { + fn probe<'bound>( + pdev: &'bound platform::Device>, + _info: Option<&'bound Self::IdInfo>, + ) -> impl PinInit + 'bound { RustDebugFs::new(pdev).pin_chain(|this| { this.counter.store(91, Relaxed); { diff --git a/samples/rust/rust_driver_platform.rs b/samples/rust/rust_driver_platform.rs index 04d40f836275..ec0d6cac4f57 100644 --- a/samples/rust/rust_driver_platform.rs +++ b/samples/rust/rust_driver_platform.rs @@ -101,14 +101,14 @@ struct SampleDriver { impl platform::Driver for SampleDriver { type IdInfo = Info; - type Data = Self; + type Data<'bound> = Self; const OF_ID_TABLE: Option> = Some(&OF_TABLE); const ACPI_ID_TABLE: Option> = Some(&ACPI_TABLE); - fn probe( - pdev: &platform::Device>, - info: Option<&Self::IdInfo>, - ) -> impl PinInit { + fn probe<'bound>( + pdev: &'bound platform::Device>, + info: Option<&'bound Self::IdInfo>, + ) -> impl PinInit + 'bound { let dev = pdev.as_ref(); dev_dbg!(dev, "Probe Rust Platform driver sample.\n"); diff --git a/samples/rust/rust_i2c_client.rs b/samples/rust/rust_i2c_client.rs index 3f273c754f86..2d876f4e3ee0 100644 --- a/samples/rust/rust_i2c_client.rs +++ b/samples/rust/rust_i2c_client.rs @@ -106,14 +106,14 @@ struct SampleDriver { impl platform::Driver for SampleDriver { type IdInfo = (); - type Data = Self; + type Data<'bound> = Self; const OF_ID_TABLE: Option> = Some(&OF_TABLE); const ACPI_ID_TABLE: Option> = Some(&ACPI_TABLE); - fn probe( - pdev: &platform::Device>, - _info: Option<&Self::IdInfo>, - ) -> impl PinInit { + fn probe<'bound>( + pdev: &'bound platform::Device>, + _info: Option<&'bound Self::IdInfo>, + ) -> impl PinInit + 'bound { dev_info!( pdev.as_ref(), "Probe Rust I2C Client registration sample.\n" @@ -130,7 +130,10 @@ fn probe( }) } - fn unbind(pdev: &platform::Device>, _this: Pin<&Self>) { + fn unbind<'bound>( + pdev: &'bound platform::Device>, + _this: Pin<&Self::Data<'bound>>, + ) { dev_info!( pdev.as_ref(), "Unbind Rust I2C Client registration sample.\n" diff --git a/samples/rust/rust_soc.rs b/samples/rust/rust_soc.rs index c466653491d2..808d58200eb6 100644 --- a/samples/rust/rust_soc.rs +++ b/samples/rust/rust_soc.rs @@ -37,14 +37,14 @@ struct SampleSocDriver { impl platform::Driver for SampleSocDriver { type IdInfo = (); - type Data = Self; + type Data<'bound> = Self; const OF_ID_TABLE: Option> = Some(&OF_TABLE); const ACPI_ID_TABLE: Option> = Some(&ACPI_TABLE); - fn probe( - pdev: &platform::Device>, - _info: Option<&Self::IdInfo>, - ) -> impl PinInit { + fn probe<'bound>( + pdev: &'bound platform::Device>, + _info: Option<&'bound Self::IdInfo>, + ) -> impl PinInit + 'bound { dev_dbg!(pdev, "Probe Rust SoC driver sample.\n"); let pdev = pdev.into(); -- 2.54.0