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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 9C51EC61DA4 for ; Thu, 16 Feb 2023 07:27:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=o9wzfXmtHlweY3NdfdJTfj1LMu0UGhw8367Vw45Q+w8=; b=Gx5GYdlCKWrVG7 Feyg2uwxS0vGqmxrfIsf1KLdZbVNEzH9mVznzvP19cgrPCiOrZlZZ50EFSwtFiYQjqLLy7noT8LZ5 5l+BVqVrtJD+jb0homI3KYrvaggm21RTdQKqn2Xv/WN9SYK39FJjdnggc8hapOPY8DPDCMTGjEDa3 9dHc3cnR3E4HBjcEwMlKGLg8oe9TZVgd0EszCGFVC/rdq0ZrxGW/xaqIuGbQ4crMPhxsbsU0lWRKQ 6HI7SzmCmyqIU9QGbVjJAf4O4E4sw6sXxfGHeNtMD8s9vyvOLi+bqXFA8dINohWOBcKrLM24T6pPd 3iax1dFcpMbSH9nKrxrQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pSYev-008nb1-B8; Thu, 16 Feb 2023 07:26:25 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1pSYes-008naE-HL for linux-arm-kernel@lists.infradead.org; Thu, 16 Feb 2023 07:26:23 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 261BA61E4C; Thu, 16 Feb 2023 07:26:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CAE39C433D2; Thu, 16 Feb 2023 07:26:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1676532380; bh=eJEQHIPlenJG8lQt473cDjk+4g+XrKqUDMyiKiKZ4eA=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=RvK78HaUCCqokQtOPxdvaIwZqWKadYV1QL0dEQgwweACu97H/YlOr4Xw2i+l+XXaY O59UDyiqEz6yhstPI6QrA9JSzksxr6uCvJGCB+A0GK8CDIuip4xPhXB63UfflGbVwT brFUrD1FjSnZ5ztW0w5xC41axFiElbd1ipj4FtK/9ervRbFRQxD+PEoH/IpOSqS566 jLI2n3wi9dgWyqaQ6xW0z0rZM9WFfbNWu60BHcBSX1IIdGI6KmHRvzr79ykDdV3cF7 fRwkfzbuHeoykhu7uJKyvBTiUkNLKEVQ033Wwnp4LZLCjjafpU1VGfgdTdO5Hf6AE1 cGVjG6L0FGGUA== Date: Thu, 16 Feb 2023 09:26:15 +0200 From: Leon Romanovsky To: Bjorn Helgaas Cc: Ganapatrao Kulkarni , linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, bhelgaas@google.com, jean-philippe@linaro.org, darren@os.amperecomputing.com, scott@os.amperecomputing.com, Will Deacon , Robin Murphy , Joerg Roedel , linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev Subject: Re: [PATCH] PCI/ATS: Allow to enable ATS on VFs even if it is not enabled on PF Message-ID: References: <20230215205726.GA3213227@bhelgaas> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20230215205726.GA3213227@bhelgaas> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230215_232622_655478_547D5949 X-CRM114-Status: GOOD ( 22.96 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Feb 15, 2023 at 02:57:26PM -0600, Bjorn Helgaas wrote: > [+cc Will, Robin, Joerg for arm-smmu-v3 page size question] > > On Sun, Feb 12, 2023 at 08:14:48PM +0200, Leon Romanovsky wrote: > > On Wed, Feb 08, 2023 at 10:43:21AM -0800, Ganapatrao Kulkarni wrote: > > > As per PCIe specification(section 10.5), If a VF implements an > > > ATS capability, its associated PF must implement an ATS capability. > > > The ATS Capabilities in VFs and their associated PFs are permitted to > > > be enabled independently. > > > Also, it states that the Smallest Translation Unit (STU) for VFs must be > > > hardwired to Zero and the associated PF's value applies to VFs STU. > > > > > > The current code allows to enable ATS on VFs only if it is already > > > enabled on associated PF, which is not necessary as per the specification. > > > > > > It is only required to have valid STU programmed on PF to enable > > > ATS on VFs. Adding code to write the first VFs STU to a PF's STU > > > when PFs ATS is not enabled. > > > > Can you please add here quotes from the spec and its version? I don't see > > anything like this in my version of PCIe specification. > > See PCIe r6.0, sec 10.5.1. Awesome, I have old versions. Thanks _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel