From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Subject: Re: use generic DMA mapping code in powerpc V4 Date: Sat, 19 Jan 2019 15:04:52 +0100 Message-ID: <20190119140452.GA25198@lst.de> References: <871403f2-fa7d-de15-89eb-070432e15c69@xenosoft.de> <20190118112842.GA9115@lst.de> <20190118121810.GA13327@lst.de> <20190118125500.GA15657@lst.de> <20190119130222.GA24346@lst.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <20190119130222.GA24346-jcswGhMUV9g@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: Christian Zigotzky Cc: linux-arch-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Darren Stevens , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Julian Margetson , linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, Paul Mackerras , linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, Christoph Hellwig List-Id: linux-arch.vger.kernel.org On Sat, Jan 19, 2019 at 02:02:22PM +0100, Christoph Hellwig wrote: > Interesting. This suggest it is related to the use of ZONE_DMA by > the FSL SOCs that your board uses. Let me investigate this a bit more. As a hack to check that theory I've pushed a new commit to the powerpc-dma.6-debug branch to use old powerpc GFP_DMA selection with the new dma direct code: http://git.infradead.org/users/hch/misc.git/commitdiff/5c532d07c2f3c3972104de505d06b8d85f403f06 And another one that drops the addressability checks that powerpc never had: http://git.infradead.org/users/hch/misc.git/commitdiff/18e7629b38465ca98f8e7eed639123a13ac3b669 Can you first test with both patches, and then just with the first in case that worked? From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from verein.lst.de ([213.95.11.211]:49272 "EHLO newverein.lst.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728125AbfASOEy (ORCPT ); Sat, 19 Jan 2019 09:04:54 -0500 Date: Sat, 19 Jan 2019 15:04:52 +0100 From: Christoph Hellwig Subject: Re: use generic DMA mapping code in powerpc V4 Message-ID: <20190119140452.GA25198@lst.de> References: <871403f2-fa7d-de15-89eb-070432e15c69@xenosoft.de> <20190118112842.GA9115@lst.de> <20190118121810.GA13327@lst.de> <20190118125500.GA15657@lst.de> <20190119130222.GA24346@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190119130222.GA24346@lst.de> Sender: linux-arch-owner@vger.kernel.org List-ID: To: Christian Zigotzky Cc: Christoph Hellwig , linux-arch@vger.kernel.org, Darren Stevens , linux-kernel@vger.kernel.org, Julian Margetson , linux-mm@kvack.org, iommu@lists.linux-foundation.org, Paul Mackerras , Olof Johansson , linuxppc-dev@lists.ozlabs.org Message-ID: <20190119140452._tRb-NsmaRfIw3t01Iy2FvjfQlU9WZJKY1jYSnIphWA@z> On Sat, Jan 19, 2019 at 02:02:22PM +0100, Christoph Hellwig wrote: > Interesting. This suggest it is related to the use of ZONE_DMA by > the FSL SOCs that your board uses. Let me investigate this a bit more. As a hack to check that theory I've pushed a new commit to the powerpc-dma.6-debug branch to use old powerpc GFP_DMA selection with the new dma direct code: http://git.infradead.org/users/hch/misc.git/commitdiff/5c532d07c2f3c3972104de505d06b8d85f403f06 And another one that drops the addressability checks that powerpc never had: http://git.infradead.org/users/hch/misc.git/commitdiff/18e7629b38465ca98f8e7eed639123a13ac3b669 Can you first test with both patches, and then just with the first in case that worked?