From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D672BCD3445 for ; Thu, 7 May 2026 23:33:09 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 475C16B00EE; Thu, 7 May 2026 19:33:05 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 3E0246B00F1; Thu, 7 May 2026 19:33:05 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0F1566B00F1; Thu, 7 May 2026 19:33:05 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id E6EC56B00EE for ; Thu, 7 May 2026 19:33:04 -0400 (EDT) Received: from smtpin16.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay01.hostedemail.com (Postfix) with ESMTP id B4CED1C13FD for ; Thu, 7 May 2026 23:33:04 +0000 (UTC) X-FDA: 84742226688.16.0D6A753 Received: from sender4-pp-f112.zoho.com (sender4-pp-f112.zoho.com [136.143.188.112]) by imf14.hostedemail.com (Postfix) with ESMTP id C6EE510000D for ; Thu, 7 May 2026 23:33:02 +0000 (UTC) Authentication-Results: imf14.hostedemail.com; dkim=pass header.d=collabora.com header.s=zohomail header.b=AnYlSpPC; dmarc=pass (policy=none) header.from=collabora.com; arc=pass ("zohomail.com:s=zohoarc:i=1"); spf=pass (imf14.hostedemail.com: domain of deborah.brouwer@collabora.com designates 136.143.188.112 as permitted sender) smtp.mailfrom=deborah.brouwer@collabora.com ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1778196783; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=2NLY72APnZcOWaicaOBiY0/NfOa0z6RzbN6RJkb//zI=; b=kLB4Vzjc7tDGVg3Z7P2N9jUKDmqG+NjDs88W9yS8r4oyMx6MnWKUGUGBf6sbXliWpqN3ZZ 1VY8Jii3FcpPv198Ah/lwKzGnx4Ec3A0cG+GOtL9kyb/dabYy0+X44vx8XtWw7Uw7wkt17 Nl8UZy7HoTICnqcHLFGDNNq3SCyOCKo= ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1778196783; a=rsa-sha256; cv=pass; b=2yjpDog2sjbXLFxpav2Rnpd6XLPl1PH+cDaespyRkWPGRK/qeds9ij0QcmEyy5FDJzD1gp 5rfomIPO7U2Elo+4lbS/eJOWXW6ofpuyc5lJMVk5E0inTm+jdRweuuTa2Do+ZOuEAiFO5Z atHMNljyaXmfQ69YJOlAdVt0qcpO7OQ= ARC-Authentication-Results: i=2; imf14.hostedemail.com; dkim=pass header.d=collabora.com header.s=zohomail header.b=AnYlSpPC; dmarc=pass (policy=none) header.from=collabora.com; arc=pass ("zohomail.com:s=zohoarc:i=1"); spf=pass (imf14.hostedemail.com: domain of deborah.brouwer@collabora.com designates 136.143.188.112 as permitted sender) smtp.mailfrom=deborah.brouwer@collabora.com ARC-Seal: i=1; a=rsa-sha256; t=1778196767; cv=none; d=zohomail.com; s=zohoarc; b=Z14Bj7DC4eNrGghUKaej8B9EyEr6aJlt54767kgVsjfSY+v2GDWo9k8q6FsodFpj4l9iPm5qQSZVX85Im/soanzyiLO6kJFvp6eO+VogOyV1Texfns6ZL641RrP8cKAI+dawYBoTeUbPChH4LCSt+DQkPgyDwr38LXPMJLhvC14= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1778196767; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:MIME-Version:Message-ID:References:Subject:Subject:To:To:Message-Id:Reply-To; bh=2NLY72APnZcOWaicaOBiY0/NfOa0z6RzbN6RJkb//zI=; b=FPH9RnopzOOqgfTnfQDFSN4/2l7YcPTesrNrf1IeboROfmxihJYy2K7jvqm3l7bP7VZENSDv4qfWNB4ZZydkjMxmF5BIrnti+SJXTjSYfWppbS7AEpx6ipkoLjQ/x7Q3Uh3oygKhHGJ4u26vFnw7PJEACrNqYUFyGuwkunzWX7o= 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=1778196767; 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:References:In-Reply-To:To:To:Cc:Cc:Reply-To; bh=2NLY72APnZcOWaicaOBiY0/NfOa0z6RzbN6RJkb//zI=; b=AnYlSpPCYOmyvmVegZhccULOjc6A2OXwMe8xbCFeG38X/bF3Fqsg9Z+zs/a1YN1N NSFJP425GMy3csNmJRQWRhMwkpMZQ3mbCXX+CYg2LxAyoCBlD2LyL9QBbOgX22fqhhW ylHSREN/6DCqlyAqbkth3SlQD77kCVRf4yhGz+o4= Received: by mx.zohomail.com with SMTPS id 1778196765290540.1630003755475; Thu, 7 May 2026 16:32:45 -0700 (PDT) From: Deborah Brouwer Date: Thu, 07 May 2026 16:32:40 -0700 Subject: [PATCH 2/7] mm: rust: add VMA page offset helper MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260507-tyr-mmap-v1-2-eec048a23c25@collabora.com> References: <20260507-tyr-mmap-v1-0-eec048a23c25@collabora.com> In-Reply-To: <20260507-tyr-mmap-v1-0-eec048a23c25@collabora.com> To: Alice Ryhl , Lorenzo Stoakes , "Liam R. Howlett" , Miguel Ojeda , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Andreas Hindborg , Trevor Gross , Danilo Krummrich , David Airlie , Simona Vetter , Daniel Almeida Cc: linux-mm@kvack.org, rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, boris.brezillon@collabora.com, beata.michalska@arm.com, lyude@redhat.com, acourbot@nvidia.com, work@onurozkan.dev, alvin.sun@linux.dev, Laura Nao , Deborah Brouwer X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=1487; i=deborah.brouwer@collabora.com; h=from:subject:message-id; bh=3UoXpSu7KF/dfK+s5Hc4A4XTkRi7kKOM3Xgjk6aPxIU=; b=owGbwMvMwCVWuULzOU9c7WvG02pJDJl/FSVdSlzlPubFRC68xhprNO/CTfev10TqDBInbAx60 H9OkiO9o5SFQYyLQVZMkeWsvVGPeNV7I935/5th5rAygQxh4OIUgImUVzD8FZp34dVrmzN7FnIl Sn4t2RFUFOJYHyPuGmgVquC370vJNYZ/moq8NZdWCZhl3TqZODlFv17+1YxLc3ZFbV9rlaV1/eI GBgA= X-Developer-Key: i=deborah.brouwer@collabora.com; a=openpgp; fpr=CD3F328C177AEF322D9FFF8379A829E70C5E7DEB X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: C6EE510000D X-Stat-Signature: fkif76nh9i7zp168i5yit74dkrd5ib1y X-Rspam-User: X-HE-Tag: 1778196782-546314 X-HE-Meta: U2FsdGVkX19RFRvwjr/unpwimVjMgLuLCcJjUluxWEgS5YhzNCGI7p9rykcbAwrXoVcbdcg0M/PMTYpKyIb0i69f2V9KVIcdbYuRCeu2/euzLsZz1jA3pMMpKcJyRux93J5Ph+fG1RPtbPcnIAsR2x6EmUzAs2yKy16WhBr/0HSVQMsmUp82wg/jfCelrXux2GIezJAQzk59bESvybJDQtEnNpebDDd4TyjN0HOnv+0F4NdZRKyLJDPvqnsToo4lnxhHF+AQ0482FJ5XLYv+PeVdtpAklErykQPYfoZ6NMawEvMaxjt9sfEvSLz3ebwOoMTrtgAzA4xuxYozBbpa1n9jTjbQInbHeqxw/y/+tolmecevncE0Y4JhGVJgS17k7QM6Bjhxr0Peuc+AJlUka+fck0rP6TDEoIjFOCzHN0Vtv/zxig/xsC8FouFN3T968wJ0OPMSvDltp6SzLKsdCNDx3RRvKJzx702QlaU2hVI2+t+TYeaS6e+u6+kK4AU6JL/bSVuyLLaPA7t3Ei6a6Y49PV23+/o/K2qvQaRgHiQOWAnLn1DSTSRMK2uWfO6pksZedu634hbHreGQ8kdSd+S+AGtLb/xCpaQw+nngn+WYch5JJtAieO71edicCOxta+QWE9POvCQXMXVvcZoD2roRRkgAZXwczd3GjwQsLBKbppjE4YB9L+48+tsgFRv7VxoAAQKxmYSqnKBJ1rU4kMWV47NZ+1hL7MMZ4j6qzhQ2ZMzg8VHbDvQK2IB0DQb0l3fqqyyloKkRa5TqGGBbBY9ftKx1uJ57G+ekNYEGEa536t9rw5Dv9YUXGU9z3hLln/W+UMrtAuI8cygbRxyfL4KSfzKfNRYpiPZ6p4LomOhJ+WNBvWuclf5L/W9qSPyoTRAQ7R6Z/wQjX+GdHTm/7d0m/p2v8svNtUswYVhZtzOViJIIleg9s3zGKXK2Qo/o13TcusschSLc8JQDf7v OwG5Et92 1EmLP3rMODw41rULuWyzTZ6xC7tpMkHfIzW9+VufBwDpCGh1HWJoYkiADbY1QNlGU2IVYGkkD3UIl5g+vOMdbmI2pZyYJH25ug2FcN6I28eZG+dNW1t/tp4k3elwyQz+8uUqAcas2ABYm0TyJrXPHdZPlnYves9GWq6CSU6ebaiCQzznIr8h9fRZnRDZNjW1+irRp7ll6sEJDf+nU47Rar9OweclMaRPj0vAfGAEJz06SYnnb3UkuwwQXnQsXcGXsyRRYvGwEmz1/YsTyGV1tXavZsl5WLTSisZq9J9UH8SWhwEzhRsU9ByRNfAT8maB0jLa4AEWfgoU/G+6cM5MBOuhV94pV7lByZVDy2VAbzMeTl0QNe5ayXgXatqe3BxdQkdCOY+eGnsE+sJ0= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Daniel Almeida Add VmaRef::pgoff() to expose vm_area_struct::vm_pgoff through the Rust VMA abstractions. vm_pgoff stores the mmap file offset in PAGE_SIZE units and can be used to distinguish different mmap regions and dispatch mmap or fault handling logic based on the requested offset. This matches the existing start()/end()/flags() helpers and avoids open-coded raw vm_area_struct access in Rust drivers. Signed-off-by: Daniel Almeida Signed-off-by: Deborah Brouwer --- rust/kernel/mm/virt.rs | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/rust/kernel/mm/virt.rs b/rust/kernel/mm/virt.rs index 63eb730b0b05..cb670e9d5fd9 100644 --- a/rust/kernel/mm/virt.rs +++ b/rust/kernel/mm/virt.rs @@ -92,6 +92,16 @@ pub fn end(&self) -> usize { unsafe { (*self.as_ptr()).__bindgen_anon_1.__bindgen_anon_1.vm_end } } + /// Returns the page offset of the virtual memory area. + /// + /// This is the offset in pages from the start of the file being mapped. + #[inline] + pub fn pgoff(&self) -> usize { + // SAFETY: By the type invariants, the caller holds at least the mmap read lock, so this + // access is not a data race. + unsafe { (*self.as_ptr()).vm_pgoff } + } + /// Zap pages in the given page range. /// /// This clears page table mappings for the range at the leaf level, leaving all other page -- 2.53.0