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[84.248.220.251]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-55a31d9176bsm203689e87.161.2025.07.18.03.34.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Jul 2025 03:34:14 -0700 (PDT) From: Abdiel Janulgue To: acourbot@nvidia.com, dakr@kernel.org, jgg@ziepe.ca, lyude@redhat.com Cc: Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Tamir Duberstein , FUJITA Tomonori , linux-kernel@vger.kernel.org (open list), Andrew Morton , Randy Dunlap , Herbert Xu , Caleb Sander Mateos , Petr Tesarik , Sui Jingfeng , Marek Szyprowski , Robin Murphy , airlied@redhat.com, iommu@lists.linux.dev (open list:DMA MAPPING HELPERS), rust-for-linux@vger.kernel.org, Abdiel Janulgue Subject: [PATCH v3 2/2] samples: rust: add sample code for scatterlist abstraction Date: Fri, 18 Jul 2025 13:33:35 +0300 Message-ID: <20250718103359.1026240-3-abdiel.janulgue@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250718103359.1026240-1-abdiel.janulgue@gmail.com> References: <20250718103359.1026240-1-abdiel.janulgue@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add simple excercises to test the scatterlist abstraction. Co-developed-by: Alexandre Courbot Signed-off-by: Alexandre Courbot Signed-off-by: Abdiel Janulgue --- samples/rust/rust_dma.rs | 49 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 48 insertions(+), 1 deletion(-) diff --git a/samples/rust/rust_dma.rs b/samples/rust/rust_dma.rs index 9e05d5c0cdae..1fa278e8e29a 100644 --- a/samples/rust/rust_dma.rs +++ b/samples/rust/rust_dma.rs @@ -4,11 +4,33 @@ //! //! To make this driver probe, QEMU must be run with `-device pci-testdev`. =20 -use kernel::{bindings, device::Core, dma::CoherentAllocation, pci, prelude= ::*, types::ARef}; +use kernel::{ + bindings, device::Core, dma::CoherentAllocation, page::*, pci, prelude= ::*, scatterlist::*, + sync::Arc, types::ARef, +}; =20 struct DmaSampleDriver { pdev: ARef, ca: CoherentAllocation, + _sgt: SGTable, ManagedMapping>, +} + +struct PagesArray(KVec); +impl SGTablePages for PagesArray { + fn iter<'a>(&'a self) -> impl Iterator { + self.0.iter().map(|page| (page, kernel::page::PAGE_SIZE, 0)) + } + + fn entries(&self) -> usize { + self.0.len() + } +} + +struct WrappedArc(Arc); +impl core::borrow::Borrow for WrappedArc { + fn borrow(&self) -> &kernel::bindings::sg_table { + &self.0 + } } =20 const TEST_VALUES: [(u32, u32); 5] =3D [ @@ -58,10 +80,35 @@ fn probe(pdev: &pci::Device, _info: &Self::IdInfo= ) -> Result