From mboxrd@z Thu Jan 1 00:00:00 1970 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 5E1C31BD9DF; Wed, 30 Oct 2024 20:57:47 +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=1730321867; cv=none; b=jcIX1tKqyRauD/BpqS0Y+nrYroacOaqcWyCPqioIxZqPo9uf5UP5Hs9ckXIRHx5mtCbRCiQDF1yQ0HMEWSqUAamQwA3ABKQ2Vs3aPsKT3AvpUCFetzrdbBiiWmNr77zL3zEgwPq7TRdf/u/fP0xXFKAdKjC7k67RRmojKJ56ng4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730321867; c=relaxed/simple; bh=wNwwtHjerl5MOUKCcq++pQSCtUGk2n3cZjFysjvFczM=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition:In-Reply-To; b=tsvuaEIMclsWEv33wqkvPl/574LSvNd58cfhS3fr96xoBruVKrxq0kDnXaWPsn4v+Ls6/GpldKULWpariqo+0IwdzGoQhfxwvdCLOTyYWJI0e929pS4Vls7nngEXtzihEXNbHVUo4RoSdjSUBhtqcQajZ2oVTK5U/UMYxt4xjMc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=fJ780LP0; 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="fJ780LP0" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BE684C4CECE; Wed, 30 Oct 2024 20:57:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1730321866; bh=wNwwtHjerl5MOUKCcq++pQSCtUGk2n3cZjFysjvFczM=; h=Date:From:To:Cc:Subject:In-Reply-To:From; b=fJ780LP0j6ktkSTkhByNv1VDAzp2PlzhQOHSWIRx6tKeha8uWCMblwtbEavcI/rkz BN1DUMTqQIiqCq3LIcsomz0BG03CYNacGft761QHGlrGRfKPYr4gIAnrgIDpO08bqr PyA4GMWST3HAtWSjMbJtuZdikZOlrHrOk3c706TLIjjOeyBm5s+zygWoxyx4PbuApG xveVP3jm73wiIK5iVH/1GaraBg2oZhN+eoiK0zuTUfZNOjGW1ULZ3zDzaNi2QZ7DG2 kjB+DoVuU1UpQNnWkFrJZhUamu1cU/AxJu3Bve9EN2b+a/5MS0Esanwae10eV+a2gW JZi91cfvYa1bQ== Date: Wed, 30 Oct 2024 15:57:45 -0500 From: Bjorn Helgaas To: Jan Kiszka Cc: Nishanth Menon , Santosh Shilimkar , Vignesh Raghavendra , Tero Kristo , Rob Herring , Krzysztof Kozlowski , Conor Dooley , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org, Siddharth Vadapalli , Bao Cheng Su , Hua Qian Li , Diogo Ivo , Lorenzo Pieralisi , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Bjorn Helgaas Subject: Re: [PATCH v6 4/7] PCI: keystone: Add support for PVU-based DMA isolation on AM654 Message-ID: <20241030205745.GA1219408@bhelgaas> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Mon, Sep 09, 2024 at 07:03:57PM +0200, Jan Kiszka wrote: > From: Jan Kiszka > > The AM654 lacks an IOMMU, thus does not support isolating DMA requests > from untrusted PCI devices to selected memory regions this way. Use > static PVU-based protection instead. The PVU, when enabled, will only > accept DMA requests that address previously configured regions. > > Use the availability of a restricted-dma-pool memory region as trigger > and register it as valid DMA target with the PVU. In addition, enable > the mapping of requester IDs to VirtIDs in the PCI RC. Use only a single > VirtID so far, catching all devices. This may be extended later on. > > Signed-off-by: Jan Kiszka Acked-by: Bjorn Helgaas > + /* Only process the first restricted dma pool, more are not allowed */ s/dma/DMA/ to match other usage.