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 X-Spam-Level: X-Spam-Status: No, score=-4.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E625BC0044C for ; Wed, 7 Nov 2018 21:29:56 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9A3D920989 for ; Wed, 7 Nov 2018 21:29:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9A3D920989 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 42r01Z3JTtzF3KX for ; Thu, 8 Nov 2018 08:29:54 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Received: from ozlabs.org (bilbo.ozlabs.org [IPv6:2401:3900:2:1::2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 42qzz629FvzF37W for ; Thu, 8 Nov 2018 08:27:46 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Received: by ozlabs.org (Postfix, from userid 1034) id 42qzz607sKz9sCX; Thu, 8 Nov 2018 08:27:45 +1100 (AEDT) X-powerpc-patch-notification: thanks X-powerpc-patch-commit: 3182215dd0b2120fb942ed88430cfb7c12d583e0 In-Reply-To: <20181030110203.27257-1-alistair@popple.id.au> To: Alistair Popple , linuxppc-dev@lists.ozlabs.org From: Michael Ellerman Subject: Re: powerpc/npu-dma: Remove NPU DMA ops Message-Id: <42qzz607sKz9sCX@ozlabs.org> Date: Thu, 8 Nov 2018 08:27:45 +1100 (AEDT) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Alistair Popple , hch@lst.de, linux-kernel@vger.kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Tue, 2018-10-30 at 11:02:03 UTC, Alistair Popple wrote: > The NPU IOMMU is setup to mirror the parent PCIe device IOMMU > setup. Therefore it does not make sense to call dma operations such as > dma_map_page, etc. directly on these devices. The existing dma-ops > simply print a warning if they are ever called, however this is > unnecessary and the warnings are likely to go unnoticed. > > It is instead simpler to remove these operations and let the generic > DMA code print warnings (eg. via a NULL pointer deref) in cases of > buggy drivers attempting dma operations on NVLink devices. > > Signed-off-by: Alistair Popple Applied to powerpc fixes, thanks. https://git.kernel.org/powerpc/c/3182215dd0b2120fb942ed88430cfb cheers