From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sender4-pp-f112.zoho.com (sender4-pp-f112.zoho.com [136.143.188.112]) (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 2EB692D061C; Sat, 26 Sep 2026 00:26:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=pass smtp.client-ip=136.143.188.112 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790382393; cv=pass; b=O9ADLDi67wkNjAbr3M75QPlcSyTUBkU/6EVg7lJY5xqFZyCVeOOBsdgNIPo38KvmlpOxIxcmP08+ELR8zF9ClmwquiVzpRT1MdPdZ5yGSXZ8GKkzuYI2G9lcierok3GYYm1uomdHXPw/lE85KzRZ6motIu4J0OdrspFD3jtliI0= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790382393; c=relaxed/simple; bh=XuWNqj3gYHFgRI2FHenDdAOIjz0nK9cfEl8ozVKL4PI=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=PTrVdvYyOvt13GfwzwKiGe9L9LP0T4YBegvhuLwNmbetdEpFOgnITAkN9ifdeTKo7rWdarMKrbp+WTikcDl4lo5O9GjgYlgy6EnMQ9PyzDZ7T1GZA7zdd+nH9lOLPidNby6c+9vWw016AmVyypdQcONUsTnT9PqHMd3D7eZrzjM= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=collabora.com; spf=pass smtp.mailfrom=collabora.com; dkim=pass (1024-bit key) header.d=collabora.com header.i=deborah.brouwer@collabora.com header.b=OiEYenyX; arc=pass smtp.client-ip=136.143.188.112 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=collabora.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=collabora.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=collabora.com header.i=deborah.brouwer@collabora.com header.b="OiEYenyX" ARC-Seal: i=1; a=rsa-sha256; t=1790382374; cv=none; d=zohomail.com; s=zohoarc; b=PeWaetxg2/MImxXj8IxqYYjLG5jnwnAj6vYFnup49O1eJ/gU/3Tkr+U7mVxIDeh+AIgtWoEN6FlpawdfpplCCSs1UfmypE7ON6hdXpEVsdzvAUCiFyd0h+f/jGUEnR90PSKHYuVb9b+XM75LpFYx1CVCAkgWaZFEnZziZEetPSM= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1790382374; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:MIME-Version:Message-ID:Subject:Subject:To:To:Message-Id:Reply-To; bh=LQ/ZbIJR6hiKL9nHx8BBYMj0YSQITVipbyTwUFEg3Rc=; b=Fh0SMjg7fMolf6FCKzsWvnthvHoqfew6gn4KSUihcKYuz+OuhHeh4jP92C0m66wIvclRexYHc+GIO/DRph0YIXE9Pb5BhddUKUF/jyRZwZlbPF/JcBzU8HspPSQGUAWU0xCh/y2SKIR5X1ARe9a6emAHNv7X+oUqWVNM3P/opmM= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=collabora.com; spf=pass smtp.mailfrom=deborah.brouwer@collabora.com; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1790382374; s=zohomail; d=collabora.com; i=deborah.brouwer@collabora.com; h=From:From:Date:Date:Subject:Subject:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-Id:Message-Id:In-Reply-To:To:To:Cc:Cc:Reply-To; bh=LQ/ZbIJR6hiKL9nHx8BBYMj0YSQITVipbyTwUFEg3Rc=; b=OiEYenyXNiJ3GBhAVE8aXyCFL0dmYQyoG0JQOtYA/oRYVcVUKAelz5GZpFNMeTT0 u6MPvRLzSJnweT+M5rDGV9/YyHXqtIrH3x4az546gIjUHtYZN3J23KdDmdh2JtJA2Ju NtYH3vv+KRWrs3ALA+QmG/asdcNA8Tak3S1oX7zE= Received: by smtp.zohomail.com with SMTPS id 1790382372759884.051922969394; Fri, 25 Sep 2026 17:26:12 -0700 (PDT) From: Deborah Brouwer Date: Fri, 25 Sep 2026 17:26:09 -0700 Subject: [PATCH v3 1/2] rust: uapi: add zerocopy/zerocopy_derive 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: 7bit Message-Id: <20260925-b4-gpu_info_intobytes-v3-1-e19bcb71980d@collabora.com> References: <20260925-b4-gpu_info_intobytes-v3-0-e19bcb71980d@collabora.com> In-Reply-To: <20260925-b4-gpu_info_intobytes-v3-0-e19bcb71980d@collabora.com> To: Danilo Krummrich , Alice Ryhl , Daniel Almeida , David Airlie , Simona Vetter , Miguel Ojeda , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Andreas Hindborg , Trevor Gross , Tamir Duberstein , Alexandre Courbot , =?utf-8?q?Onur_=C3=96zkan?= Cc: dri-devel@lists.freedesktop.org, rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, Deborah Brouwer X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=2711; i=deborah.brouwer@collabora.com; h=from:subject:message-id; bh=XuWNqj3gYHFgRI2FHenDdAOIjz0nK9cfEl8ozVKL4PI=; b=owGbwMvMwCVWuULzOU9c7WvG02pJDFnbBZWqxFVmit1pu217XGSheEDbhEXrS7iO3a1c6TOR4 6LthgfbO0pZGMS4GGTFFFnO2hv1iFe9N9Kd/78ZZg4rE8gQBi5OAZjI/LkMf3jjPA4c2fHt6Kr1 kWu3v26ab30rvVfhw/Jj85cseGK5OOoMw/+04nOieY/+iVuw99z//XRNe7GyivMf2RvmGoFGEkm Xe7kB X-Developer-Key: i=deborah.brouwer@collabora.com; a=openpgp; fpr=CD3F328C177AEF322D9FFF8379A829E70C5E7DEB Make the zerocopy and zerocopy_derive crates available for use when building the UAPI crate and its tests. Then attempt to derive most of the zerocopy traits for struct drm_panthor_gpu_info when generating its binding. This will be used by the Tyr driver that needs the traits IntoBytes and Immutable to safely copy the struct byte-for-byte to userspace. Signed-off-by: Deborah Brouwer --- rust/Makefile | 12 +++++++++--- rust/bindgen_parameters | 3 +++ 2 files changed, 12 insertions(+), 3 deletions(-) diff --git a/rust/Makefile b/rust/Makefile index da1a7409d984..bf02a1efd6f3 100644 --- a/rust/Makefile +++ b/rust/Makefile @@ -365,8 +365,11 @@ rusttestlib-bindings: private rustc_target_flags = --extern ffi --extern pin_ini rusttestlib-bindings: $(src)/bindings/lib.rs rusttestlib-ffi rusttestlib-pin_init FORCE +$(call if_changed,rustc_test_library) -rusttestlib-uapi: private rustc_target_flags = --extern ffi --extern pin_init -rusttestlib-uapi: $(src)/uapi/lib.rs rusttestlib-ffi rusttestlib-pin_init FORCE +rusttestlib-uapi: private rustc_target_flags = --extern ffi --extern pin_init \ + --extern zerocopy=$(objtree)/$(obj)/test/libzerocopy.rlib \ + --extern zerocopy_derive=$(objtree)/$(obj)/test/$(libzerocopy_derive_name) +rusttestlib-uapi: $(src)/uapi/lib.rs rusttestlib-ffi rusttestlib-pin_init \ + rusttestlib-zerocopy rusttestlib-zerocopy_derive FORCE +$(call if_changed,rustc_test_library) quiet_cmd_rustdoc_test = RUSTDOC T $< @@ -782,11 +785,14 @@ $(obj)/bindings.o: $(src)/bindings/lib.rs \ $(obj)/bindings/bindings_helpers_generated.rs FORCE +$(call if_changed_rule,rustc_library) -$(obj)/uapi.o: private rustc_target_flags = --extern ffi --extern pin_init +$(obj)/uapi.o: private rustc_target_flags = --extern ffi --extern pin_init \ + --extern zerocopy --extern zerocopy_derive $(obj)/uapi.o: private skip_gendwarfksyms = 1 $(obj)/uapi.o: $(src)/uapi/lib.rs \ $(obj)/ffi.o \ $(obj)/pin_init.o \ + $(obj)/zerocopy.o \ + $(obj)/$(libzerocopy_derive_name) \ $(obj)/uapi/uapi_generated.rs FORCE +$(call if_changed_rule,rustc_library) diff --git a/rust/bindgen_parameters b/rust/bindgen_parameters index 8402b0c93545..332bc8d6a9f7 100644 --- a/rust/bindgen_parameters +++ b/rust/bindgen_parameters @@ -71,3 +71,6 @@ # Structs should implement `Zeroable` when all of their fields do. --with-derive-custom-struct .*=MaybeZeroable --with-derive-custom-union .*=MaybeZeroable + +# `drm_panthor_gpu_info` is copied byte-for-byte to userspace. +--with-derive-custom-struct '^drm_panthor_gpu_info$'=zerocopy_derive::most_traits -- 2.55.0