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Fri, 15 Aug 2025 22:58:18 -0700 (PDT) From: Ayush Singh Date: Sat, 16 Aug 2025 11:27:45 +0530 Subject: [PATCH v2 1/2] rust: kernel: of: Add DeviceNode abstraction Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250816-rust-overlay-abs-v2-1-48a2c8921df2@beagleboard.org> References: <20250816-rust-overlay-abs-v2-0-48a2c8921df2@beagleboard.org> In-Reply-To: <20250816-rust-overlay-abs-v2-0-48a2c8921df2@beagleboard.org> To: Jason Kridner , Deepak Khatri , Robert Nelson , Miguel Ojeda , Dhruva Gole , Alex Gaynor , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Greg Kroah-Hartman , "Rafael J. Wysocki" , Rob Herring , Saravana Kannan , Benno Lossin , Benno Lossin Cc: rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Ayush Singh X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=3553; i=ayush@beagleboard.org; h=from:subject:message-id; bh=Yr2juqHcjwAX7V6XPlZ5OUKAynUfQSZf7AeKvSLuCbk=; b=owEBbQKS/ZANAwAKAQXO9ceJ5Vp0AcsmYgBooB3tm1FR2wzC3Tr3tawFGHveDicVohBvuue/f nQ9xyG5YRKJAjMEAAEKAB0WIQTfzBMe8k8tZW+lBNYFzvXHieVadAUCaKAd7QAKCRAFzvXHieVa dD0xD/wL3+Y/JbGH7Gd6yo2Hpb+9ULrOksiq/Y9T3498ZMUlV8lLfde0FJboUitzR6bBrGs3OFc XLdrUFkui6sJ+loOj/QKKscvspVQsZhepwSx63vRQ5fe6lLQJRIdCuB0vpblRd0FTPNTj+thw2p d809746/fZR72TlwhQjmPemj064YuPuF3zNlDcYqkXL8tvczXCXKX2S3WZ7J4QduY5elXJUfoY5 HQShvB6BSaPzb1SWBqERgta9YdFJQpzHgaSahKs7ddyLnimfm8rIe1CjTrjxxdXeGXiYj6KnaMZ gCASyPzO9/E2Q7VWNIZoS2Dpem226PMA3YKSsJ/VDJJiu0meYOUIwfFsZ6dUwkA7Uq/qcUXkqsK jQunuJ4MVqysGTLXXrYXRNcf9PqpL0wWrdnoC4KRA8cZRN8Bd+BoiKj8QEUYjnzsRRhXaxCC5mY FTcL1fHmua7fhqCSVVMehwb0mvPYig4d8LehaCGPCBOp8G1KpCPHkZV69mXQTGa2VlPc7ruK8t4 aShxxdW+9ueQJ3CElBEgi8yZ9uQZs5fwJmDr7zXPi4yHMGuyUzwvX4mSMLe84bV+NvCAhGRfRDy 3knZA3zf1uCp9uEdLQUdu2viZB616RVIJnf8vP0ScFGxpmmNFuZp3qzc6zdgERnfYI6KBGwRijY EArbQXO79vcVeIg== X-Developer-Key: i=ayush@beagleboard.org; a=openpgp; fpr=DFCC131EF24F2D656FA504D605CEF5C789E55A74 Allow getting struct device_node from struct fwnode_handle. This is required when applying devicetree overlays using the `of_overlay_fdt_apply`. Signed-off-by: Ayush Singh --- rust/bindings/bindings_helper.h | 1 + rust/helpers/of.c | 5 +++++ rust/kernel/device/property.rs | 18 ++++++++++++++++++ rust/kernel/of.rs | 12 ++++++++++++ 4 files changed, 36 insertions(+) diff --git a/rust/bindings/bindings_helper.h b/rust/bindings/bindings_helpe= r.h index 84d60635e8a9baef1f1a1b2752dc0fa044f8542f..f35764bf28647f6d567afcbe073= c37b30a3b0284 100644 --- a/rust/bindings/bindings_helper.h +++ b/rust/bindings/bindings_helper.h @@ -58,6 +58,7 @@ #include #include #include +#include #include #include #include diff --git a/rust/helpers/of.c b/rust/helpers/of.c index 86b51167c913f96b626e55adb51bdac2a9f04f56..fba7a26dfd45a6d4350aa2a3e5b= 43ddbcd1b2c70 100644 --- a/rust/helpers/of.c +++ b/rust/helpers/of.c @@ -6,3 +6,8 @@ bool rust_helper_is_of_node(const struct fwnode_handle *fwn= ode) { return is_of_node(fwnode); } + +struct device_node *rust_helper_to_of_node(const struct fwnode_handle *fwn= ode) +{ + return to_of_node(fwnode); +} diff --git a/rust/kernel/device/property.rs b/rust/kernel/device/property.rs index 49ee12a906dbadbe932e207fc7a0d1d622125f5f..e19c1aebd5d5a7f0eedf8ef264d= 36b943eaf1fc5 100644 --- a/rust/kernel/device/property.rs +++ b/rust/kernel/device/property.rs @@ -68,6 +68,24 @@ pub fn is_of_node(&self) -> bool { unsafe { bindings::is_of_node(self.as_raw()) } } =20 + /// Returns `DeviceNode` if `&self` is an OF node. + pub fn to_of_node(&self) -> Option<&crate::of::DeviceNode> { + // SAFETY: The type invariant of `Self` guarantees that `self.as_r= aw() is a pointer to a + // valid `struct fwnode_handle`. + let of_node =3D unsafe { bindings::to_of_node(self.as_raw()) }; + + if of_node.is_null() { + None + } else { + // SAFETY: `of_node` is valid. Its lifetime is tied to `&self`= . We + // return a reference instead of an `ARef` because= `to_of_node()` + // doesn't increment the refcount. It is safe to cast from a + // `struct device_node*` to a `*const DeviceNode` because `Dev= iceNode` is + // defined as a `#[repr(transparent)]` wrapper around `device_= node`. + Some(unsafe { &*of_node.cast() }) + } + } + /// Returns an object that implements [`Display`](core::fmt::Display) = for /// printing the name of a node. /// diff --git a/rust/kernel/of.rs b/rust/kernel/of.rs index b76b35265df2ea6b8b6dcf3d3dab5519d6092bf9..74d42dce06f0e9f67a0e5bd1287= 117b4966d4af9 100644 --- a/rust/kernel/of.rs +++ b/rust/kernel/of.rs @@ -6,6 +6,7 @@ bindings, device_id::{RawDeviceId, RawDeviceIdIndex}, prelude::*, + types::Opaque }; =20 /// IdTable type for OF drivers. @@ -63,3 +64,14 @@ macro_rules! of_device_table { $crate::module_device_table!("of", $module_table_name, $table_name= ); }; } + +/// Devicetree device node +#[repr(transparent)] +pub struct DeviceNode(Opaque); + +impl DeviceNode { + /// Obtain the raw `struct device_node *`. + pub fn as_raw(&self) -> *mut bindings::device_node { + self.0.get() + } +} --=20 2.50.1 From nobody Sat Oct 4 12:41:20 2025 Received: from mail-pg1-f170.google.com (mail-pg1-f170.google.com [209.85.215.170]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EFAE318DB01 for ; 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Wysocki" , Rob Herring , Saravana Kannan , Benno Lossin , Benno Lossin Cc: rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Ayush Singh X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1536; i=ayush@beagleboard.org; h=from:subject:message-id; bh=DrbctBGMgceWHyU2G3iajKdl9FJ/GIp+Lv0AO0b4Ibw=; b=owEBbQKS/ZANAwAKAQXO9ceJ5Vp0AcsmYgBooB3tJrlOtPTqSiWnSQcILitlwR6+YrzBwopAB skmiYeHt6aJAjMEAAEKAB0WIQTfzBMe8k8tZW+lBNYFzvXHieVadAUCaKAd7QAKCRAFzvXHieVa dAQVD/0Q5hTcGTe/dOvA31APqGKCstjWbPgoIGuSHivTDdQ6WDmL8YTE0ye8sXqDS4b5+MMRZks Cp8ZRw+Nb6TxCCnnuBoBYtXcay5Mkl3jXX/DRS+TEkVP+y2iJz35C7rQrJv5f/i4acPBSnQmhN1 rNAEL2JF+v1RkWfoJuScYR4geli6Ojcreb+03NAterVUVCeXauaMQjK6lY4YP1+cwyd45CXWKNT NPZK1PLZuwZxsif0TA+OmvbyXp2ByTFp35V1dGt9Cw/LeHvDzKgtZgw/Y6FEJWhS6i+nkEbLrDH CCveRN4nYFbofeXyDly4UPF+7fnmpUFAxUpZbbf9jg3RyK3J5BONwfLmeVlEFOr4J/GcSZxgi7W KhXiG2rombic+QRufQvRF5Yw7K9Xh0Gha20Nw6aCGuElxO5MKTQXYJbu4fGH7kEiEog8uwyDtH4 Am6UsqTJ0BSz8nVMF2/o96uND58qfRvumguVGVhEB1y25+UjduKSNQMpnrF3CPN96CAqqXr4k4m MVuknIj3vd3/LolSZ98XP6L5iJFvYoT0oVVIosu7I8KWK64+AacUrmNzPzl6vbH5ZNQHJP/zS3N BCxSNKWrPuxYBWZedGrZVdsxkWKezUj2L+IiTJ7mSt+Q7BcVO/PKOC66Vqdcm1MJS16v2ULQu3F EBxGO4SdJcrjYTg== X-Developer-Key: i=ayush@beagleboard.org; a=openpgp; fpr=DFCC131EF24F2D656FA504D605CEF5C789E55A74 Allow applying devicetree overlays from Rust. The overlay is removed on Drop. Signed-off-by: Ayush Singh --- rust/kernel/of.rs | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/rust/kernel/of.rs b/rust/kernel/of.rs index 74d42dce06f0e9f67a0e5bd1287117b4966d4af9..646148cc959fd5414271f9cf902= 3ef5d77a2ac2c 100644 --- a/rust/kernel/of.rs +++ b/rust/kernel/of.rs @@ -75,3 +75,37 @@ pub fn as_raw(&self) -> *mut bindings::device_node { self.0.get() } } + +/// Devicetree overlay present in livetree. +/// +/// The overlay is removed on Drop +pub struct OvcsId(kernel::ffi::c_int); + +impl OvcsId { + /// Create and apply an overlay changeset to the live tree. + pub fn of_overlay_fdt_apply(overlay: &[u8], base: &DeviceNode) -> Resu= lt { + let mut ovcs_id: kernel::ffi::c_int =3D 0; + + // Ensure that overlay length fits in u32 + let Ok(overlay_len) =3D overlay.len().try_into() else { + return Err(crate::error::code::E2BIG); + }; + + crate::error::to_result(unsafe { + bindings::of_overlay_fdt_apply( + overlay.as_ptr().cast(), + overlay_len, + &mut ovcs_id, + base.as_raw(), + ) + })?; + + Ok(Self(ovcs_id)) + } +} + +impl Drop for OvcsId { + fn drop(&mut self) { + unsafe { bindings::of_overlay_remove(&mut self.0) }; + } +} --=20 2.50.1