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[124.171.83.152]) by smtp.gmail.com with ESMTPSA id d14sm13201702pjc.20.2020.07.12.21.59.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 12 Jul 2020 21:59:45 -0700 (PDT) Subject: Re: [PATCH 4/5] dma-mapping: add a dma_ops_bypass flag to struct device To: Christoph Hellwig , iommu@lists.linux-foundation.org Cc: linuxppc-dev@lists.ozlabs.org, Lu Baolu , Greg Kroah-Hartman , Joerg Roedel , Robin Murphy , Jesper Dangaard Brouer , =?UTF-8?B?QmrDtnJuIFTDtnBlbA==?= , Daniel Borkmann , linux-kernel@vger.kernel.org References: <20200708152449.316476-1-hch@lst.de> <20200708152449.316476-5-hch@lst.de> From: Alexey Kardashevskiy Autocrypt: addr=aik@ozlabs.ru; keydata= mQINBE+rT0sBEADFEI2UtPRsLLvnRf+tI9nA8T91+jDK3NLkqV+2DKHkTGPP5qzDZpRSH6mD EePO1JqpVuIow/wGud9xaPA5uvuVgRS1q7RU8otD+7VLDFzPRiRE4Jfr2CW89Ox6BF+q5ZPV /pS4v4G9eOrw1v09lEKHB9WtiBVhhxKK1LnUjPEH3ifkOkgW7jFfoYgTdtB3XaXVgYnNPDFo PTBYsJy+wr89XfyHr2Ev7BB3Xaf7qICXdBF8MEVY8t/UFsesg4wFWOuzCfqxFmKEaPDZlTuR 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c7E5M+/NpslPCmYnDjs5qg0/3ihh6XuOGggZQOqrYPC3PnsNs3NxirwOkVPQgO6mXxpuifvJ DG9EMkK8IBXnLulqVk54kf7fE0jT/d8RTtJIA92GzsgdK2rpT1MBKKVffjRFGwN7nQVOzi4T XrB5p+6ML7Bd84xOEGsj/vdaXmz1esuH7BOZAGEZfLRCHJ0GVCSssg== Message-ID: <9bff7460-e6fa-f765-dcb4-cc96eb86d92c@ozlabs.ru> Date: Mon, 13 Jul 2020 14:59:39 +1000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20200708152449.316476-5-hch@lst.de> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 09/07/2020 01:24, Christoph Hellwig wrote: > Several IOMMU drivers have a bypass mode where they can use a direct > mapping if the devices DMA mask is large enough. Add generic support > to the core dma-mapping code to do that to switch those drivers to > a common solution. > > Signed-off-by: Christoph Hellwig > --- > include/linux/device.h | 8 +++++ > kernel/dma/Kconfig | 8 +++++ > kernel/dma/mapping.c | 74 +++++++++++++++++++++++++++++------------- > 3 files changed, 68 insertions(+), 22 deletions(-) > > diff --git a/include/linux/device.h b/include/linux/device.h > index 4c4af98321ebd6..1f71acf37f78d7 100644 > --- a/include/linux/device.h > +++ b/include/linux/device.h > @@ -523,6 +523,11 @@ struct dev_links_info { > * sync_state() callback. > * @dma_coherent: this particular device is dma coherent, even if the > * architecture supports non-coherent devices. > + * @dma_ops_bypass: If set to %true then the dma_ops are bypassed for the > + * streaming DMA operations (->map_* / ->unmap_* / ->sync_*), > + * and optionall (if the coherent mask is large enough) also s/optionall/optional/g Otherwise the series looks good and works well on powernv and pseries. Thanks, -- Alexey