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 5C6593783DB; Thu, 21 May 2026 23:40:49 +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=1779406856; cv=none; b=eo+zWNn29zByYixgLwvRWX4Sq+bnRDB232xxvruunBy5qu+rPXwF405uP8i4fwD/vj6xfSvYhZHoVPrfYFW1iKDYAGWQXteP9bHnAVwhp0NjSPCi/quyus1pgBa8u/14ack3XkdeMY93DmdZObzxv5RB8whlRB+nq3DbCxJg/U4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779406856; c=relaxed/simple; bh=e0jspvouZkiyrH2SPBAFhl5Q2C6Gk3Lbzoa6e0IGpyU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gCCSt8fS28gffnJs/nmdSgCQvEDQPUBZU7BXkL9U3JUaq6oNZIlR+vh/eW/7cz6cakb51ZZcDTvsPc88KN5NnIA8jkzFzlZ5OlfzVvTZsKMKUGL80z2AYmjgYswilvRpETsbJYkpXwgLO18zl/f0PFmenKNFIjqMCsDN/ojFnmo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=oYQxh1bx; 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="oYQxh1bx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4C6E41F00A3C; Thu, 21 May 2026 23:40:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779406848; bh=QpF4w0yZ/AivrhZ9KACyFbY/eeTlz1cmCXatORmv+kY=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=oYQxh1bxkE3iUJAh6VV/3HUy2plmWIo8oULBngJn1zaBDyWmeGWTfo8KIX13TPoKW hsuM6noHrSAkC4HrivfAwPrImmX7z1XPz6eDvLeZAi1wRP8HOGtprjIG6PVq0vfUD5 36fVeE84ZMk9LYMru2hN/dQzLuDPl1eKAOVMAgYYXNLLyUeumjHrwm/eNeExlwQrei Cwvzz0Y7EBc8VHT/8pOzkmeCQdOxJ/L+EYu/tYyoBS30sTBmpAarZyrnaD1L3GOtwt ZFDeOsgWJjmm9T2xS3wvD16UxmPdlDLcPdAAzG7BBQtBz1PMJk8WnZc3yZkgPmDTax kT/6LScL+HYUw== 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 13/27] rust: auxiliary: make Driver trait lifetime-parameterized Date: Fri, 22 May 2026 01:34:39 +0200 Message-ID: <20260521233501.1191842-14-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-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. Reviewed-by: Alexandre Courbot Signed-off-by: Danilo Krummrich --- drivers/gpu/drm/nova/driver.rs | 10 +++++----- rust/kernel/auxiliary.rs | 16 ++++++++-------- samples/rust/rust_driver_auxiliary.rs | 10 +++++----- 3 files changed, 18 insertions(+), 18 deletions(-) diff --git a/drivers/gpu/drm/nova/driver.rs b/drivers/gpu/drm/nova/driver.rs index 7605348af994..aa08644012f7 100644 --- a/drivers/gpu/drm/nova/driver.rs +++ b/drivers/gpu/drm/nova/driver.rs @@ -51,13 +51,13 @@ pub(crate) struct NovaData { impl auxiliary::Driver for NovaDriver { type IdInfo = (); - type Data = Self; + type Data<'bound> = Self; const ID_TABLE: auxiliary::IdTable = &AUX_TABLE; - fn probe( - adev: &auxiliary::Device>, - _info: &Self::IdInfo, - ) -> impl PinInit { + fn probe<'bound>( + adev: &'bound auxiliary::Device>, + _info: &'bound Self::IdInfo, + ) -> impl PinInit + 'bound { let data = try_pin_init!(NovaData { adev: adev.into() }); let drm = drm::Device::::new(adev.as_ref(), data)?; diff --git a/rust/kernel/auxiliary.rs b/rust/kernel/auxiliary.rs index 6d504b0933d5..5591f97f12f7 100644 --- a/rust/kernel/auxiliary.rs +++ b/rust/kernel/auxiliary.rs @@ -46,7 +46,7 @@ // - `DEVICE_DRIVER_OFFSET` is the correct byte offset to the embedded `struct device_driver`. unsafe impl driver::DriverLayout for Adapter { type DriverType = bindings::auxiliary_driver; - type DriverData<'bound> = T::Data; + type DriverData<'bound> = T::Data<'bound>; const DEVICE_DRIVER_OFFSET: usize = core::mem::offset_of!(Self::DriverType, driver); } @@ -112,7 +112,7 @@ extern "C" fn remove_callback(adev: *mut bindings::auxiliary_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 { adev.as_ref().drvdata_borrow::() }; + let data = unsafe { adev.as_ref().drvdata_borrow::>() }; T::unbind(adev, data); } @@ -203,7 +203,7 @@ 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 device ids supported by the driver. const ID_TABLE: IdTable; @@ -211,10 +211,10 @@ pub trait Driver { /// Auxiliary driver probe. /// /// Called when an auxiliary device is matches a corresponding driver. - fn probe( - dev: &Device>, - id_info: &Self::IdInfo, - ) -> impl PinInit; + fn probe<'bound>( + dev: &'bound Device>, + id_info: &'bound Self::IdInfo, + ) -> impl PinInit, Error> + 'bound; /// Auxiliary driver unbind. /// @@ -226,7 +226,7 @@ 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_driver_auxiliary.rs b/samples/rust/rust_driver_auxiliary.rs index 0e979f45cd68..b30a4d5cdf8a 100644 --- a/samples/rust/rust_driver_auxiliary.rs +++ b/samples/rust/rust_driver_auxiliary.rs @@ -31,14 +31,14 @@ impl auxiliary::Driver for AuxiliaryDriver { type IdInfo = (); - type Data = Self; + type Data<'bound> = Self; const ID_TABLE: auxiliary::IdTable = &AUX_TABLE; - fn probe( - adev: &auxiliary::Device>, - _info: &Self::IdInfo, - ) -> impl PinInit { + fn probe<'bound>( + adev: &'bound auxiliary::Device>, + _info: &'bound Self::IdInfo, + ) -> impl PinInit + 'bound { dev_info!( adev, "Probing auxiliary driver for auxiliary device with id={}\n", -- 2.54.0