From nobody Sat Oct 4 14:10:49 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 ; Sat, 16 Aug 2025 05:58:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.170 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755323908; cv=none; b=PN8ta5d+vuzvXzWFeIVRW+5Zln5zwA0WK5Xb0rH1zOrHrXKHi4VUwmgw50GHqVAL1c1eOiBowwmwHvqLhJOwuVSKstGskefjQzvGJSSbMx6UmyLNuij3BJ9tr8CGYjgo595VA6OKJz3mLHyLhWLA9l/9LbG/s7iXtksi5B6IFgc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755323908; c=relaxed/simple; bh=DrbctBGMgceWHyU2G3iajKdl9FJ/GIp+Lv0AO0b4Ibw=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Fe1YDztNLOmMdn26RgVAw4gJ5xEGMU5i0m7AdtuANrnK93EIqsmDI+QtO/5wd82hTfKElqHer+ZT5VBmFAeTr/sZW9L08AutHZuHWxDdo0ujKeHL0K4a3g+BSKmyeLQp6RKeIGV2zjFXp53RF6vN1YTScd34yEsiDVogkW5/XXc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=beagleboard.org; spf=fail smtp.mailfrom=beagleboard.org; dkim=pass (2048-bit key) header.d=beagleboard-org.20230601.gappssmtp.com header.i=@beagleboard-org.20230601.gappssmtp.com header.b=Iiw/0hfx; arc=none smtp.client-ip=209.85.215.170 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=beagleboard.org Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=beagleboard.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=beagleboard-org.20230601.gappssmtp.com header.i=@beagleboard-org.20230601.gappssmtp.com header.b="Iiw/0hfx" Received: by mail-pg1-f170.google.com with SMTP id 41be03b00d2f7-b471754c159so1693808a12.3 for ; Fri, 15 Aug 2025 22:58:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=beagleboard-org.20230601.gappssmtp.com; s=20230601; t=1755323906; x=1755928706; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=mxd0WrYqOz4ItTjbQ6f59qSMdSo/i5unAWV7GJYBATY=; b=Iiw/0hfxV8o1WbHtTO25SWUFRu7XvuuNxAzV0YKkSLWsGYOzVdz1Wisnt65eKmphQW xGKXn92PraSM99YExq/aID/UL8D++jwFYM3WWpO2L7KmgrWRdG0/sIyMa88a37G40tKs wAg4UFL17Bz0KZCGy5fBblSKDnSlD+o4OnfEWNYuKilvR0ZtzL7L3DwFUSC48uCn7Yww vq2PfeMjTNtIeLkMzyXpRsWMtO1pDu0GMi6+zIluM270agGhmtscOPRmDoe8qM+oW1Fw ZFUP4ZlTZxyO/X/Lenpvj13A6XLI5AtJYD6Bnax+08xpZWkRpPnkGjNyW/cJBB+lYiYJ MOxQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1755323906; x=1755928706; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=mxd0WrYqOz4ItTjbQ6f59qSMdSo/i5unAWV7GJYBATY=; b=jK1k3mKX8MZvaVv0N55GZr840EUbbKhoqsgTvFKNkeJSaIHhvmewjD4slf1wtjFfee c6UdQAyT2DKcNs4x/pVWlZY6Z7b8fxQL07nuBv+GXp4c/z8dxJH8++r2a2U47Tb1XJ5r b2EFo8JiGBgpnwVUChacIb7gisBVLC9hYH56zJA6VfHVzfv3d+8b26Wjw23F+5pEfYqn OHgcNyIeAp+o4aT7WSE5CSgA6Li7N5OdF1snY+9qH98VuMMAUvvry9kioI3Rax7Hgtey gIfORvIEfc04SIOO3+7Cm5sJusVPzUwi2GU6AlgjAalxh8RZqMwlXiO84sT+ti6gRFJN Q9KQ== X-Forwarded-Encrypted: i=1; AJvYcCXmeGmGo10oFBGgC3LjOX/Kg7OT65dJRd7hBI90K5yX9NAJtAVBUr34M/ZFWonxCtcozfwWmJQTA2j/YEU=@vger.kernel.org X-Gm-Message-State: AOJu0Yyaw8M1ADnHLjssoVKH6t5NF3GhSyvz3yKtBDt1Pq8JmH/+qs+7 0cmjuGYNiGd6YcbfOtFbKTfsBOOvP/IJBSMbm7DgPRnxJa4OktXj6ga8NIM2LnGHhQ== X-Gm-Gg: ASbGncsKlEY9tTtboNq8Sw+88s9m9Ami2HcTZqRtvI/wovD8z9J1kq/rk2RS3wYJlbp 1nmjf+ur7FPtrYbWg7f1XWG/LoSZ1lwKHMcJRei434kSeaEXWEJg2Y3g6ZfV+k1hE2NSSpumAYX ucmeb9UH4HAPrVrj43crmxU8BRCzPd4TsxY5DyzZvfaeRqgmb1R4j8d940UY9Iy6O5c0E6DTFbZ yf7jwkgwpdiSkoGod6OuchVud0K6kfERK32eE536ftt7BXONsVhC7JjPq28nQ2ef18ahQdoDVxS 3yeH1JDD8AcbzWDVmrdIGRrAP8sURhc1JwUsvM7lHNdKJoqKfW4PtC+qGcL84yjPb4fNRj5PH3H uTOWfNmbAsZQioHq09lTjlM8VpuSUnBA= X-Google-Smtp-Source: AGHT+IGMUi/8br7pdXwHNqC0siZsEeBmVj1wPTeFjaWA75a/tNNlmbnRO1ELIfRE9yhceLHbSOHfOQ== X-Received: by 2002:a17:903:1a08:b0:242:9bc5:319f with SMTP id d9443c01a7336-24478ff0354mr20789205ad.55.1755323906287; Fri, 15 Aug 2025 22:58:26 -0700 (PDT) Received: from [192.168.1.9] ([2401:4900:8899:e205:7ddd:6d95:7c30:9bd3]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2446cb0a0a7sm28328245ad.65.2025.08.15.22.58.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Aug 2025 22:58:26 -0700 (PDT) From: Ayush Singh Date: Sat, 16 Aug 2025 11:27:46 +0530 Subject: [PATCH v2 2/2] rust: kernel: of: Add overlay id 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-v2-2-48a2c8921df2@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=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