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 0765C3B38AE; Sun, 28 Jun 2026 14:55:31 +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=1782658532; cv=none; b=IhLoArl371SEiV7OObagTn9pGh+3IztRJEWtFbjg+fx3Gtbyx9pDht79yaSi7G2pOHstpymPOU7kQ44aWFaavzIwtCyqywY4lzk8/b4AZtw0GkLp4GNV9fgsgLisO1gu93HpEP+6IZfgNJgjEe6LIYxvGfPgpfnhPo2SPAaWFW4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782658532; c=relaxed/simple; bh=vqzDu/iUX1GBpwyJFlir3vbUYzHYwSiNfM3pYUxj6Tc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=amnluvpkqkjoZa1UUV3vhb4SPhcDCbRs9MxgXQ9j/x/EKSStmru4Pf3Ocd0bPEmOj/bXnfFJrEhrDCCSYUoXgSJkoHT0Hf2CO0GJWt68pAirQSpHcfv8rrT8YpwzDPgQwoSRjabJtlAJK338gAId9/JWtTkInpQbCUobZ/QjRFc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=c47Xqfu+; 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="c47Xqfu+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0C27F1F00A3A; Sun, 28 Jun 2026 14:55:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1782658530; bh=fjg9k12LLTs5vTfgo/GQS8Y+N5IolDssj7B7dIPVRfY=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=c47Xqfu+8pcAZDP4Vapm/giHVCC7PvMg3Usiurdjcy3ttnOy9YN3zJHk9oJ2e6Khk jnSYcbG59GSP+LJMbZ1taCpO6JjndaKH0GKfj3As5Nn1Gnush1NoPrJJ4VVROPFYYL E6P1OankMUaSN2udlTznAIS+0sKktnikh+LteTuce3OaCjOD45Oind5qN74sp2sFGP mcgCYRWdUsAcS6NyaJd9Y5qHvRgBA2xkUcpe3wYtZphDpn483yR3ZnW/QjYNBP7bl/ +60FmXGAJGHNA4dEsJg9VcDqNfTcVrFRnmpCRXXbKjDf0MWRLVzphhoyAJcABk/w91 KKPj5njEbVyWA== From: Danilo Krummrich To: dakr@kernel.org, aliceryhl@google.com, daniel.almeida@collabora.com, acourbot@nvidia.com, ecourtney@nvidia.com, ojeda@kernel.org, boqun@kernel.org, gary@garyguo.net, bjorn3_gh@protonmail.com, lossin@kernel.org, a.hindborg@kernel.org, tmgross@umich.edu, deborah.brouwer@collabora.com, boris.brezillon@collabora.com, lyude@redhat.com Cc: driver-core@lists.linux.dev, linux-kernel@vger.kernel.org, nova-gpu@lists.linux.dev, dri-devel@lists.freedesktop.org, rust-for-linux@vger.kernel.org Subject: [PATCH v5 18/19] rust: drm: Pass registration data to ioctl handlers Date: Sun, 28 Jun 2026 16:53:38 +0200 Message-ID: <20260628145406.2107056-19-dakr@kernel.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260628145406.2107056-1-dakr@kernel.org> References: <20260628145406.2107056-1-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 Pass registration data to ioctl handlers via drm::Device::registration_data_with(). The closure's HRTB ties the lifetime to the closure scope, and the pointer cast shortens it from 'static internally. The reference is valid for the duration of the drm_dev_enter/exit critical section held by RegistrationGuard. Reviewed-by: Lyude Paul Signed-off-by: Danilo Krummrich --- drivers/gpu/drm/nova/file.rs | 3 +++ drivers/gpu/drm/tyr/file.rs | 1 + rust/kernel/drm/ioctl.rs | 8 ++++++-- 3 files changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/nova/file.rs b/drivers/gpu/drm/nova/file.rs index 19fb89b28984..208be4e38188 100644 --- a/drivers/gpu/drm/nova/file.rs +++ b/drivers/gpu/drm/nova/file.rs @@ -28,6 +28,7 @@ impl File { /// IOCTL: get_param: Query GPU / driver metadata. pub(crate) fn get_param( dev: &NovaDevice, + _reg_data: &(), getparam: &mut uapi::drm_nova_getparam, _file: &drm::File, ) -> Result { @@ -48,6 +49,7 @@ pub(crate) fn get_param( /// IOCTL: gem_create: Create a new DRM GEM object. pub(crate) fn gem_create( dev: &NovaDevice, + _reg_data: &(), req: &mut uapi::drm_nova_gem_create, file: &drm::File, ) -> Result { @@ -61,6 +63,7 @@ pub(crate) fn gem_create( /// IOCTL: gem_info: Query GEM metadata. pub(crate) fn gem_info( _dev: &NovaDevice, + _reg_data: &(), req: &mut uapi::drm_nova_gem_info, file: &drm::File, ) -> Result { diff --git a/drivers/gpu/drm/tyr/file.rs b/drivers/gpu/drm/tyr/file.rs index fb9233eae01c..b686041d5d6b 100644 --- a/drivers/gpu/drm/tyr/file.rs +++ b/drivers/gpu/drm/tyr/file.rs @@ -32,6 +32,7 @@ fn open(_dev: &drm::Device) -> Result>> { impl TyrDrmFileData { pub(crate) fn dev_query( ddev: &TyrDrmDevice, + _reg_data: &(), devquery: &mut uapi::drm_panthor_dev_query, _file: &TyrDrmFile, ) -> Result { diff --git a/rust/kernel/drm/ioctl.rs b/rust/kernel/drm/ioctl.rs index f24cf7b146a8..9b45b741db1b 100644 --- a/rust/kernel/drm/ioctl.rs +++ b/rust/kernel/drm/ioctl.rs @@ -95,6 +95,7 @@ pub const fn __dev_ctx_cast( /// /// ```ignore /// fn foo(device: &kernel::drm::Device, +/// reg_data: &Self::RegistrationData<'_>, /// data: &mut uapi::argument_type, /// file: &kernel::drm::File, /// ) -> Result @@ -169,13 +170,14 @@ macro_rules! declare_drm_ioctls { unsafe { &*__ptr }, unreachable!(), unreachable!(), + unreachable!(), ) }; // Enforce that the handler accepts higher-ranked // lifetimes, preventing it from requiring 'static // references that could escape this scope. - let _: for<'a> fn(&'a _, &'a mut _, &'a _) -> _ = $func; + let _: for<'a> fn(&'a _, &'a _, &'a mut _, &'a _) -> _ = $func; let Some(guard) = dev.registration_guard() else { return $crate::error::code::ENODEV.to_errno(); @@ -193,7 +195,9 @@ macro_rules! declare_drm_ioctls { // SAFETY: This is just the DRM file structure let file = unsafe { $crate::drm::File::from_raw(raw_file) }; - match $func(&*guard, data, file) { + match guard.registration_data_with(|reg_data| { + $func(&*guard, reg_data, data, file) + }) { Err(e) => e.to_errno(), Ok(i) => i.try_into() .unwrap_or($crate::error::code::ERANGE.to_errno()), -- 2.54.0