From patchwork Wed Mar 19 20:30:26 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Danilo Krummrich X-Patchwork-Id: 14023098 X-Patchwork-Delegate: bhelgaas@google.com 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 68F2D10E0; Wed, 19 Mar 2025 20:31:28 +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=1742416288; cv=none; b=er/xyNTx9Z8TLTjmW/qzAOPT+baGEZGbKiB30MKnH/pCafXvEa+uoAeLVOg0vkxGU1BmbzBoUuKBKySPYMg8bX03ZpB75uq8RCBOhC4bgDmElWy+ohGuw/pN5nCoAq52BoSqXDH/gkjL+WMcVnXJrzBtgofcY49c8kcTJqzFC7A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742416288; c=relaxed/simple; bh=6Xl/Pcaq5N7AF/vlFg1rfoIOXVG0Cl0VCCKDZcJgVOA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=SUTCsuBmxiv3sOr06Y8S77XdugmBJdhUHdG/3LgDUnQWkYfT0yESnBMjnRRnTH5IDNaecm1Blp4N0+SnBvQvTaYTq6U1XXS/2A+WRXY88m/j7hzu7vkVtOjXhPPMUgZ06x61KWZg38P3hgdN2sZs9WkPOlWppz5/QZe9NtSpicc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Y0nefezm; 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="Y0nefezm" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BDEF5C4CEE7; Wed, 19 Mar 2025 20:31:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1742416287; bh=6Xl/Pcaq5N7AF/vlFg1rfoIOXVG0Cl0VCCKDZcJgVOA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Y0nefezm0QfeifDJoype7OPoLq8chL+cVhw+t9KdXPiyw4HsfFV7PWe+5FnrCyvR8 ccqqtxpx3ylIzSNKIlcxZLcMugFZuWm8jXEByVot2Wyytl1dm7JpjF01KOddL/hWUy BYkTiKwXu54LOW6BYCBdg0x3UqHh+QfB6QLGhVr6gG4EFDautU9dFIlPzVZs+tAa49 iEmSWlQLwGylFmlH7mpnXdB0tCaI2IgND53h1cIbcrz9tJan9Bpz+3QHH5kHKjHlow jgL0pmhkz/4I8rS/nbOxwgGU2iIpaScW25hTuQ0Ovy4XaWC8N/QdyjlYwMkaEJh2KM trZG7Q69rxXzw== From: Danilo Krummrich To: bhelgaas@google.com, gregkh@linuxfoundation.org, rafael@kernel.org, ojeda@kernel.org, alex.gaynor@gmail.com, boqun.feng@gmail.com, gary@garyguo.net, bjorn3_gh@protonmail.com, benno.lossin@proton.me, a.hindborg@kernel.org, aliceryhl@google.com, tmgross@umich.edu Cc: linux-pci@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, Danilo Krummrich Subject: [PATCH 2/4] rust: device: implement bus_type_raw() Date: Wed, 19 Mar 2025 21:30:26 +0100 Message-ID: <20250319203112.131959-3-dakr@kernel.org> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250319203112.131959-1-dakr@kernel.org> References: <20250319203112.131959-1-dakr@kernel.org> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Implement bus_type_raw(), which returns a raw pointer to the device' struct bus_type. This is useful for bus devices, to implement the following trait. impl TryFrom<&Device> for &pci::Device With this a caller can try to get the bus specific device from a generic device in a safe way. try_from() will only succeed if the generic device' bus type pointer matches the pointer of the bus' type. Signed-off-by: Danilo Krummrich Reviewed-by: Alice Ryhl --- rust/kernel/device.rs | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/rust/kernel/device.rs b/rust/kernel/device.rs index 76b341441f3f..e2de0efd4a27 100644 --- a/rust/kernel/device.rs +++ b/rust/kernel/device.rs @@ -78,6 +78,13 @@ pub fn parent<'a>(&self) -> Option<&'a Self> { } } + /// Returns a raw pointer to the device' bus type. + #[expect(unused)] + pub(crate) fn bus_type_raw(&self) -> *const bindings::bus_type { + // SAFETY: By the type invariants, `self.as_raw()` is a valid pointer to a `struct device`. + unsafe { (*self.as_raw()).bus } + } + /// Convert a raw C `struct device` pointer to a `&'a Device`. /// /// # Safety