From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 8057A33343E; Mon, 20 Oct 2025 22:36:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760999771; cv=none; b=YdglPUwMbYO7vEtOcBwOoRk6p57REzPkQKHFqzYEwsAewt9C31avsd1xwPyvavEcNisXcUa98i6kuddXn6N4rKL7NE9EjcOYhquJjG6bWvP6wCOKF4fdFozbuYhkU1Q0YN4UOBeiWP8uyekBJm/TfZF/7a0Rr3lJlyVJDNDesaA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760999771; c=relaxed/simple; bh=QxGK4UEFzt4WjxckGXtrR7+T4t6vEtOAH7gCnrjQeow=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=jCV6iyXZGv7PbVtu2Lr8by2qOhs3M/h0v2BRuYw9Vx5LI1o08Ca/LeUqSxya1sSrvqx9mrM2PQ6wZVAhgL13GQ//fCtN62uZautxueO7NGRgPX3R0dxc46e1nndoAfSW+2djprLX1i8Y2vF+DdyjNCI4uhVLzl6q8l8qe2QMiBY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ssaEuPZ4; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ssaEuPZ4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C37F9C116C6; Mon, 20 Oct 2025 22:36:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1760999771; bh=QxGK4UEFzt4WjxckGXtrR7+T4t6vEtOAH7gCnrjQeow=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ssaEuPZ4oOxv9g2hn1GLCbgTX8Aqn2hwpeHezcOC9AUh2TBRpwazxGnNHdmh+YvmU 9OoXJOGYA4mcfBscwNrNlusxEtEObzdVVBrcihS8axS1n6Dn9H1k13vYqGywxZOW0Z xEPkhY02w72g6LxbspznwJFnPKEzu2oLYTxHeLZImnPFvk6UnGWOMJjHGYqGdR9k5+ wdRkKMWie6cA+EIxEo7Pw/A70Hcc+GygNAdhnritquR+6gef9GcVhsom7cY4YlQxip T1hM+Z0HFv/WS4I27zy2el1ibKMH55mpdlEgdnhZS/lvEeGrxvvf8AWM6Gxft0QT0g z9dbO5jewKVHA== From: Danilo Krummrich To: gregkh@linuxfoundation.org, rafael@kernel.org, bhelgaas@google.com, kwilczynski@kernel.org, david.m.ertman@intel.com, ira.weiny@intel.com, leon@kernel.org, acourbot@nvidia.com, ojeda@kernel.org, alex.gaynor@gmail.com, boqun.feng@gmail.com, gary@garyguo.net, bjorn3_gh@protonmail.com, lossin@kernel.org, a.hindborg@kernel.org, aliceryhl@google.com, tmgross@umich.edu, pcolberg@redhat.com Cc: rust-for-linux@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Danilo Krummrich Subject: [PATCH 8/8] samples: rust: auxiliary: illustrate driver interaction Date: Tue, 21 Oct 2025 00:34:30 +0200 Message-ID: <20251020223516.241050-9-dakr@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251020223516.241050-1-dakr@kernel.org> References: <20251020223516.241050-1-dakr@kernel.org> Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Illustrate how a parent driver of an auxiliary driver can take advantage of the device context guarantees given by the auxiliary bus and subsequently safely derive its device private data. Signed-off-by: Danilo Krummrich --- samples/rust/rust_driver_auxiliary.rs | 22 +++++++++++++++++++--- 1 file changed, 19 insertions(+), 3 deletions(-) diff --git a/samples/rust/rust_driver_auxiliary.rs b/samples/rust/rust_driver_auxiliary.rs index a5d67d4d9e83..5761ea314f44 100644 --- a/samples/rust/rust_driver_auxiliary.rs +++ b/samples/rust/rust_driver_auxiliary.rs @@ -5,10 +5,17 @@ //! To make this driver probe, QEMU must be run with `-device pci-testdev`. use kernel::{ - auxiliary, c_str, device::Core, devres::Devres, driver, error::Error, pci, prelude::*, + auxiliary, c_str, + device::{Bound, Core}, + devres::Devres, + driver, + error::Error, + pci, + prelude::*, InPlaceModule, }; +use core::any::TypeId; use pin_init::PinInit; const MODULE_NAME: &CStr = ::NAME; @@ -43,6 +50,7 @@ fn probe(adev: &auxiliary::Device, _info: &Self::IdInfo) -> impl PinInit, #[pin] @@ -63,6 +71,7 @@ impl pci::Driver for ParentDriver { fn probe(pdev: &pci::Device, _info: &Self::IdInfo) -> impl PinInit { try_pin_init!(Self { + private: TypeId::of::(), _reg0 <- auxiliary::Registration::new(pdev.as_ref(), AUXILIARY_NAME, 0, MODULE_NAME), _reg1 <- auxiliary::Registration::new(pdev.as_ref(), AUXILIARY_NAME, 1, MODULE_NAME), }) @@ -70,9 +79,10 @@ fn probe(pdev: &pci::Device, _info: &Self::IdInfo) -> impl PinInit Result { + fn connect(adev: &auxiliary::Device) -> Result { let dev = adev.parent(); - let pdev: &pci::Device = dev.try_into()?; + let pdev: &pci::Device = dev.try_into()?; + let drvdata = dev.drvdata::()?; dev_info!( dev, @@ -82,6 +92,12 @@ fn connect(adev: &auxiliary::Device) -> Result { pdev.device_id() ); + dev_info!( + dev, + "We have access to the private data of {:?}.\n", + drvdata.private + ); + Ok(()) } } -- 2.51.0