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[82.0.78.162]) by smtp.gmail.com with ESMTPSA id t6-20020a05600c198600b0038cafe3d47dsm8725698wmq.42.2022.04.07.09.05.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 07 Apr 2022 09:05:19 -0700 (PDT) Subject: Re: [PATCH net-next] sfc: Stop using iommu_present() To: Robin Murphy , habetsm.xilinx@gmail.com, davem@davemloft.net, kuba@kernel.org, pabeni@redhat.com Cc: netdev@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org References: <7350f957944ecfce6cce90f422e3992a1f428775.1649166055.git.robin.murphy@arm.com> From: Edward Cree Message-ID: <296fa369-723f-f9b7-773f-7695b12c9971@gmail.com> Date: Thu, 7 Apr 2022 17:05:18 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.5.0 MIME-Version: 1.0 In-Reply-To: <7350f957944ecfce6cce90f422e3992a1f428775.1649166055.git.robin.murphy@arm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-4.6 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, RDNS_NONE,SPF_HELO_NONE,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/04/2022 14:40, Robin Murphy wrote: > Even if an IOMMU might be present for some PCI segment in the system, > that doesn't necessarily mean it provides translation for the device > we care about. It appears that what we care about here is specifically > whether DMA mapping ops involve any IOMMU overhead or not, so check for > translation actually being active for our device. > > Signed-off-by: Robin Murphy Acked-by: Edward Cree