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[84.248.220.251]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5550b2401f7sm142363e87.30.2025.06.26.13.32.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Jun 2025 13:32:56 -0700 (PDT) From: Abdiel Janulgue To: acourbot@nvidia.com, jgg@ziepe.ca, lyude@redhat.com, dakr@kernel.org 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 , Valentin Obst , linux-kernel@vger.kernel.org (open list), Marek Szyprowski , Robin Murphy , airlied@redhat.com, rust-for-linux@vger.kernel.org, iommu@lists.linux.dev (open list:DMA MAPPING HELPERS), Petr Tesarik , Andrew Morton , Herbert Xu , Sui Jingfeng , Randy Dunlap , Michael Kelley , Abdiel Janulgue Subject: [PATCH v2 2/2] samples: rust: add sample code for scatterlist bindings Date: Thu, 26 Jun 2025 23:30:08 +0300 Message-ID: <20250626203247.816273-3-abdiel.janulgue@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250626203247.816273-1-abdiel.janulgue@gmail.com> References: <20250626203247.816273-1-abdiel.janulgue@gmail.com> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add simple excercises to test the scatterlist bindings. Signed-off-by: Abdiel Janulgue --- samples/rust/rust_dma.rs | 29 ++++++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-) diff --git a/samples/rust/rust_dma.rs b/samples/rust/rust_dma.rs index 874c2c964afa..c4d44e5a45b8 100644 --- a/samples/rust/rust_dma.rs +++ b/samples/rust/rust_dma.rs @@ -4,11 +4,15 @@ //! //! To make this driver probe, QEMU must be run with `-device pci-testdev`. -use kernel::{bindings, device::Core, dma::CoherentAllocation, pci, prelude::*, types::ARef}; +use kernel::{ + bindings, device::Core, dma::CoherentAllocation, page::*, pci, prelude::*, scatterlist::*, + types::ARef, +}; struct DmaSampleDriver { pdev: ARef, ca: CoherentAllocation, + sgt: DeviceSGTable, } const TEST_VALUES: [(u32, u32); 5] = [ @@ -34,6 +38,18 @@ unsafe impl kernel::transmute::AsBytes for MyStruct {} // SAFETY: Instances of `MyStruct` have no uninitialized portions. unsafe impl kernel::transmute::FromBytes for MyStruct {} +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() + } +} + kernel::pci_device_table!( PCI_TABLE, MODULE_PCI_TABLE, @@ -62,10 +78,20 @@ fn probe(pdev: &pci::Device, _info: &Self::IdInfo) -> Result, _info: &Self::IdInfo) -> Result Result { for (i, value) in TEST_VALUES.into_iter().enumerate() { -- 2.43.0