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[84.248.220.251]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5498b1c2a08sm448920e87.223.2025.03.07.03.08.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 07 Mar 2025 03:08:44 -0800 (PST) From: Abdiel Janulgue To: rust-for-linux@vger.kernel.org, daniel.almeida@collabora.com, dakr@kernel.org, robin.murphy@arm.com, aliceryhl@google.com Cc: Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Trevor Gross , Valentin Obst , linux-kernel@vger.kernel.org (open list), Christoph Hellwig , Marek Szyprowski , airlied@redhat.com, iommu@lists.linux.dev (open list:DMA MAPPING HELPERS), Abdiel Janulgue Subject: [PATCH v13 5/7] samples: rust: add Rust dma test sample driver Date: Fri, 7 Mar 2025 13:06:22 +0200 Message-ID: <20250307110821.1703422-6-abdiel.janulgue@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250307110821.1703422-1-abdiel.janulgue@gmail.com> References: <20250307110821.1703422-1-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 a simple driver to excercise the basics of the Rust DMA coherent allocator bindings. Suggested-by: Danilo Krummrich Signed-off-by: Abdiel Janulgue --- samples/rust/Kconfig | 11 +++++ samples/rust/Makefile | 1 + samples/rust/rust_dma.rs | 104 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 116 insertions(+) create mode 100644 samples/rust/rust_dma.rs diff --git a/samples/rust/Kconfig b/samples/rust/Kconfig index 3b6eae84b297..04bbba870bd1 100644 --- a/samples/rust/Kconfig +++ b/samples/rust/Kconfig @@ -78,4 +78,15 @@ config SAMPLE_RUST_HOSTPROGS =20 If unsure, say N. =20 +config SAMPLE_RUST_DRIVER_DMA + tristate "DMA test driver" + depends on PCI + help + This option builds the Rust dma test driver sample. + + To compile this as a module, choose M here: + the module will be called dma. + + If unsure, say N. + endif # SAMPLES_RUST diff --git a/samples/rust/Makefile b/samples/rust/Makefile index 0dbc6d90f1ef..1a9aff6e8d6a 100644 --- a/samples/rust/Makefile +++ b/samples/rust/Makefile @@ -7,6 +7,7 @@ obj-$(CONFIG_SAMPLE_RUST_PRINT) +=3D rust_print.o obj-$(CONFIG_SAMPLE_RUST_DRIVER_PCI) +=3D rust_driver_pci.o obj-$(CONFIG_SAMPLE_RUST_DRIVER_PLATFORM) +=3D rust_driver_platform.o obj-$(CONFIG_SAMPLE_RUST_DRIVER_FAUX) +=3D rust_driver_faux.o +obj-$(CONFIG_SAMPLE_RUST_DRIVER_DMA) +=3D rust_dma.o =20 rust_print-y :=3D rust_print_main.o rust_print_events.o =20 diff --git a/samples/rust/rust_dma.rs b/samples/rust/rust_dma.rs new file mode 100644 index 000000000000..aed55ae4dcfe --- /dev/null +++ b/samples/rust/rust_dma.rs @@ -0,0 +1,104 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! Rust DMA api test (based on QEMU's `pci-testdev`). +//! +//! To make this driver probe, QEMU must be run with `-device pci-testdev`. + +use kernel::{bindings, dma::CoherentAllocation, pci, prelude::*}; + +struct DmaSampleDriver { + pdev: pci::Device, + ca: kernel::devres::Devres>, +} + +const TEST_VALUES: [(u32, u32); 5] =3D [ + (0xa, 0xb), + (0xc, 0xd), + (0xe, 0xf), + (0xab, 0xba), + (0xcd, 0xef), +]; + +struct MyStruct { + h: u32, + b: u32, +} + +impl MyStruct { + fn new(h: u32, b: u32) -> Self { + Self { h, b } + } +} +// SAFETY: All bit patterns are acceptable values for `MyStruct`. +unsafe impl kernel::transmute::AsBytes for MyStruct {} +// SAFETY: Instances of `MyStruct` have no uninitialized portions. +unsafe impl kernel::transmute::FromBytes for MyStruct {} + +kernel::pci_device_table!( + PCI_TABLE, + MODULE_PCI_TABLE, + ::IdInfo, + [( + pci::DeviceId::from_id(bindings::PCI_VENDOR_ID_REDHAT, 0x5), + () + )] +); + +impl pci::Driver for DmaSampleDriver { + type IdInfo =3D (); + const ID_TABLE: pci::IdTable =3D &PCI_TABLE; + + fn probe(pdev: &mut pci::Device, _info: &Self::IdInfo) -> Result>> { + let dev =3D pdev.as_mut(); + + dev.dma_set_mask_and_coherent(kernel::dma::dma_bit_mask(64))?; + + dev_info!(dev, "Probe DMA test driver.\n"); + + let ca: kernel::devres::Devres> =3D + CoherentAllocation::alloc_coherent(dev, TEST_VALUES.len(), GFP= _KERNEL)?; + + || -> Result { + let reg =3D ca.try_access().ok_or(ENXIO)?; + + for (i, value) in TEST_VALUES.into_iter().enumerate() { + kernel::dma_write!(reg[i] =3D MyStruct::new(value.0, value= .1)); + } + + Ok(()) + }()?; + + let drvdata =3D KBox::new( + Self { + pdev: pdev.clone(), + ca, + }, + GFP_KERNEL, + )?; + + Ok(drvdata.into()) + } +} + +impl Drop for DmaSampleDriver { + fn drop(&mut self) { + dev_info!(self.pdev.as_ref(), "Unload DMA test driver.\n"); + + let _ =3D || -> Result { + let reg =3D self.ca.try_access().ok_or(ENXIO)?; + for (i, value) in TEST_VALUES.into_iter().enumerate() { + assert_eq!(kernel::dma_read!(reg[i].h), value.0); + assert_eq!(kernel::dma_read!(reg[i].b), value.1); + } + Ok(()) + }(); + } +} + +kernel::module_pci_driver! { + type: DmaSampleDriver, + name: "rust_dma", + author: "Abdiel Janulgue", + description: "Rust DMA test", + license: "GPL v2", +} --=20 2.43.0