From nobody Fri Oct 3 16:41:51 2025 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 2B113312801; Thu, 28 Aug 2025 13:33:51 +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=1756388032; cv=none; b=fMoPDeojyqoet2aaM2kJahvCGth/0bsJSa3Wo6+D98gPFraIXwLFQ/nYhCQljOrh7ysepJSgf11wTn0gAUWfzPG39TADaNx6Ck0NtEUQIR0xp5llRNNwiWTHx4o+yXWyT0qw7CV6yVJeZkb7ztkzNuroKOdVcAv06hTsPwH2yWQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756388032; c=relaxed/simple; bh=VEhwm2ECodQvAWIjeH0MwqDVbP+hyzKhO930qjxxU1A=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=LQfw8V675D9Xt6ZG8SIZMiJdcWSHyPuJDoiGaBqCN9pCwfCNCE/Llwy+xVUXdFVqPs9nw6wu65GkJaYjq5wDH5ralXVakmNBXg1Lq0g5OG8q74CEmiIUe9v37/NZNVHUDmoYWspGJN4NBzJ5FTQftWcFflaO2bWMno1vZDFr4wI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=DKFmqw4v; 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="DKFmqw4v" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0FE53C4CEEB; Thu, 28 Aug 2025 13:33:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1756388031; bh=VEhwm2ECodQvAWIjeH0MwqDVbP+hyzKhO930qjxxU1A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DKFmqw4vHZE3XIx4IzYfKMHP+tE7nV74nfHX6QUmksGkulG5Hf4D4SUcGuIoXxCbO u3/9SoGDwdfE1dj1sQvhZqEdCm08XSER6Rspz3CvV5rb/cDUBue8AiiT0UTI7J9BFW MwjpcyrHY8DE/CE04AZ0kvuaHbfRecJzzzTf1tNGVpcoOO0sr6QGzDR+yg2WlGz60a jngBes+6Ca0otclavUZXmic8LDttT7uST2iko5URrjIA0PE+iTVCfm2d3rL4tMprnl EWmciYqXvvJyTfhoq7F6TRfQTDKf3ZH7qwvrkaYPlOmqhKHXfbfatHZNtzDp2rg+dy BUw5FMi0H4daA== From: Danilo Krummrich To: akpm@linux-foundation.org, 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, abdiel.janulgue@gmail.com, acourbot@nvidia.com, jgg@ziepe.ca, lyude@redhat.com, robin.murphy@arm.com, daniel.almeida@collabora.com Cc: rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, Danilo Krummrich Subject: [PATCH v4 4/5] samples: rust: dma: add sample code for SGTable Date: Thu, 28 Aug 2025 15:32:17 +0200 Message-ID: <20250828133323.53311-5-dakr@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250828133323.53311-1-dakr@kernel.org> References: <20250828133323.53311-1-dakr@kernel.org> 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 sample code for allocating and mapping a scatter-gather table (`SGTable`). Reviewed-by: Alexandre Courbot Reviewed-by: Daniel Almeida Reviewed-by: Lyude Paul Co-developed-by: Abdiel Janulgue Signed-off-by: Abdiel Janulgue Signed-off-by: Danilo Krummrich Reviewed-by: Alice Ryhl --- samples/rust/rust_dma.rs | 35 ++++++++++++++++++++++++++--------- 1 file changed, 26 insertions(+), 9 deletions(-) diff --git a/samples/rust/rust_dma.rs b/samples/rust/rust_dma.rs index c5e7cce68654..04007e29fd85 100644 --- a/samples/rust/rust_dma.rs +++ b/samples/rust/rust_dma.rs @@ -7,15 +7,19 @@ use kernel::{ bindings, device::Core, - dma::{CoherentAllocation, Device, DmaMask}, - pci, + dma::{CoherentAllocation, DataDirection, Device, DmaMask}, + page, pci, prelude::*, + scatterlist::{Owned, SGTable}, types::ARef, }; =20 +#[pin_data(PinnedDrop)] struct DmaSampleDriver { pdev: ARef, ca: CoherentAllocation, + #[pin] + sgt: SGTable>>, } =20 const TEST_VALUES: [(u32, u32); 5] =3D [ @@ -70,21 +74,30 @@ fn probe(pdev: &pci::Device, _info: &Self::IdInfo= ) -> Result) { + let dev =3D self.pdev.as_ref(); + + dev_info!(dev, "Unload DMA test driver.\n"); =20 for (i, value) in TEST_VALUES.into_iter().enumerate() { let val0 =3D kernel::dma_read!(self.ca[i].h); @@ -99,6 +112,10 @@ fn drop(&mut self) { assert_eq!(val1, value.1); } } + + for (i, entry) in self.sgt.iter().enumerate() { + dev_info!(dev, "Entry[{}]: DMA address: {:#x}", i, entry.dma_a= ddress()); + } } } =20 --=20 2.51.0