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Thu, 29 Aug 2019 04:46:05 -0700 (PDT) X-Gm-Message-State: APjAAAVGY9vRWmd17NZ8ESxHmR7RQxUfeVANqZheVSN3nJuUYsMIgZ8L o9VP9111nhPY8FtuaWWaNGibhwbYyT8HVZXk24E= X-Google-Smtp-Source: APXvYqySzvmeE9kiWjvNGM1iaAxnZ+QgH8m0ESiSIlhk3/0sUZoqbPgAj7pYaewNuKSsBX5H2zvSqil85IeqcrkN9II= X-Received: by 2002:a67:fe12:: with SMTP id l18mr5139562vsr.54.1567079164044; Thu, 29 Aug 2019 04:46:04 -0700 (PDT) MIME-Version: 1.0 References: <20190506223334.1834-1-nicoleotsuka@gmail.com> <20190506223334.1834-3-nicoleotsuka@gmail.com> <20190825011025.GA23410@lst.de> <20190826073320.GA11712@lst.de> <20190827075021.GA953@lst.de> <20190827115541.GB5921@lst.de> In-Reply-To: From: Masahiro Yamada Date: Thu, 29 Aug 2019 20:45:27 +0900 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v2 2/2] dma-contiguous: Use fallback alloc_pages for single pages To: Christoph Hellwig X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190829_044628_516164_D2BDD177 X-CRM114-Status: GOOD ( 20.92 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ulf Hansson , Tony Lindgren , Catalin Marinas , Will Deacon , Linux Kernel Mailing List , Max Filippov , Marek Szyprowski , Stephen Rothwell , Joerg Roedel , Russell King , Thierry Reding , linux-xtensa@linux-xtensa.org, Kees Cook , Nicolin Chen , Andrew Morton , linux-arm-kernel , Chris Zankel , Wolfram Sang , David Woodhouse , linux-mmc , Adrian Hunter , iommu@lists.linux-foundation.org, iamjoonsoo.kim@lge.com, Robin Murphy Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Aug 28, 2019 at 9:23 PM Masahiro Yamada wrote: > > On Wed, Aug 28, 2019 at 7:53 PM Masahiro Yamada > wrote: > > > > Hi Christoph, > > > > On Tue, Aug 27, 2019 at 8:55 PM Christoph Hellwig wrote: > > > > > > On Tue, Aug 27, 2019 at 06:03:14PM +0900, Masahiro Yamada wrote: > > > > Yes, this makes my driver working again > > > > when CONFIG_DMA_CMA=y. > > > > > > > > > > > > If I apply the following, my driver gets back working > > > > irrespective of CONFIG_DMA_CMA. > > > > > > That sounds a lot like the device simply isn't 64-bit DMA capable, and > > > previously always got CMA allocations under the limit it actually > > > supported. I suggest that you submit this quirk to the mmc maintainers. > > > > > > I tested v5.2 and my MMC host controller works with > > dma_address that exceeds 32-bit physical address. > > > > So, I believe my MMC device is 64-bit DMA capable. > > > > I am still looking into the code > > to find out what was changed. > > > I retract this comment. > > Prior to bd2e75633c8012fc8a7431c82fda66237133bf7e, > the descriptor table for ADMA is placed within the > 32-bit phys address range, not exceeds the 32-bit limit. > > Probably, my device is not 64-bit capable. > > I will talk to the hardware engineer, > and check the hardware spec just in case. > After looking more into my hardware, I found out how to fix my driver: https://lore.kernel.org/patchwork/patch/1121600/ -- Best Regards Masahiro Yamada _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel